text: /*
   * metadata.c: Routines for accessing the metadata
   *
   * Authors:
   *   Miguel de Icaza (miguel@ximian.com)
   *   Paolo Molaro (lupus@ximian.com)
   *
   * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
   * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
   */
  
  #include <config.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <glib.h>
  #include "metadata.h"
  #include "tabledefs.h"
  #include "mono-endian.h"
  #include "cil-coff.h"
  #include "tokentype.h"
  #include "metadata-internals.h"
  #include "class-internals.h"
  #include "verify-internals.h"
  #include "class.h"
  #include "marshal.h"
  #include "debug-helpers.h"
  #include <mono/utils/mono-error-internals.h>
  #include <mono/utils/bsearch.h>
  
  /* Auxiliary structure used for caching inflated signatures */
  typedef struct {
  	MonoMethodSignature *sig;
  	MonoGenericContext context;
  } MonoInflatedMethodSignature;
  
  static gboolean do_mono_metadata_parse_type (MonoType *type, MonoImage *m, MonoGenericContainer *container, gboolean transient,
  					 const char *ptr, const char **rptr);
  
  static gboolean do_mono_metadata_type_equal (MonoType *t1, MonoType *t2, gboolean signature_only);
  static gboolean mono_metadata_class_equal (MonoClass *c1, MonoClass *c2, gboolean signature_only);
  static gboolean mono_metadata_fnptr_equal (MonoMethodSignature *s1, MonoMethodSignature *s2, gboolean signature_only);
  static gboolean _mono_metadata_generic_class_equal (const MonoGenericClass *g1, const MonoGenericClass *g2,
  						    gboolean signature_only);
  static void free_generic_inst (MonoGenericInst *ginst);
  static void free_generic_class (MonoGenericClass *ginst);
  static void free_inflated_method (MonoMethodInflated *method);
  static void free_inflated_signature (MonoInflatedMethodSignature *sig);
  static void mono_metadata_field_info_full (MonoImage *meta, guint32 index, guint32 *offset, guint32 *rva, MonoMarshalSpec **marshal_spec, gboolean alloc_from_image);
  static guint mono_metadata_generic_param_hash (MonoGenericParam *p);
  
  /*
   * This enumeration is used to describe the data types in the metadata
   * tables
   */
  enum {
  	MONO_MT_END,
  
  	/* Sized elements */
  	MONO_MT_UINT32,
  	MONO_MT_UINT16,
  	MONO_MT_UINT8,
  
  	/* Index into Blob heap */
  	MONO_MT_BLOB_IDX,
  
  	/* Index into String heap */
  	MONO_MT_STRING_IDX,
  
  	/* GUID index */
  	MONO_MT_GUID_IDX,
  
  	/* Pointer into a table */
  	MONO_MT_TABLE_IDX,
  
  	/* HasConstant:Parent pointer (Param, Field or Property) */
  	MONO_MT_CONST_IDX,
  
  	/* HasCustomAttribute index.  Indexes any table except CustomAttribute */
  	MONO_MT_HASCAT_IDX,
  	
  	/* CustomAttributeType encoded index */
  	MONO_MT_CAT_IDX,
  
  	/* HasDeclSecurity index: TypeDef Method or Assembly */
  	MONO_MT_HASDEC_IDX,
  
  	/* Implementation coded index: File, Export AssemblyRef */
  	MONO_MT_IMPL_IDX,
  
  	/* HasFieldMarshal coded index: Field or Param table */
  	MONO_MT_HFM_IDX,
  
  	/* MemberForwardedIndex: Field or Method */
  	MONO_MT_MF_IDX,
  
  	/* TypeDefOrRef coded index: typedef, typeref, typespec */
  	MONO_MT_TDOR_IDX,
  
  	/* MemberRefParent coded index: typeref, moduleref, method, memberref, typesepc, typedef */
  	MONO_MT_MRP_IDX,
  
  	/* MethodDefOrRef coded index: Method or Member Ref table */
  	MONO_MT_MDOR_IDX,
  
  	/* HasSemantic coded index: Event or Property */
  	MONO_MT_HS_IDX,
  
  	/* ResolutionScope coded index: Module, ModuleRef, AssemblytRef, TypeRef */
  	MONO_MT_RS_IDX
  };
  
  const static unsigned char TableSchemas [] = {
  #define ASSEMBLY_SCHEMA_OFFSET 0
  	MONO_MT_UINT32,     /* "HashId" }, */
  	MONO_MT_UINT16,     /* "Major" },  */
  	MONO_MT_UINT16,     /* "Minor" }, */
  	MONO_MT_UINT16,     /* "BuildNumber" }, */
  	MONO_MT_UINT16,     /* "RevisionNumber" }, */
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_BLOB_IDX,   /* "PublicKey" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_STRING_IDX, /* "Culture" }, */
  	MONO_MT_END,
  
  #define ASSEMBLYOS_SCHEMA_OFFSET ASSEMBLY_SCHEMA_OFFSET + 10
  	MONO_MT_UINT32,     /* "OSPlatformID" }, */
  	MONO_MT_UINT32,     /* "OSMajor" }, */
  	MONO_MT_UINT32,     /* "OSMinor" }, */
  	MONO_MT_END,
  
  #define ASSEMBLYPROC_SCHEMA_OFFSET ASSEMBLYOS_SCHEMA_OFFSET + 4
  	MONO_MT_UINT32,     /* "Processor" }, */
  	MONO_MT_END,
  
  #define ASSEMBLYREF_SCHEMA_OFFSET ASSEMBLYPROC_SCHEMA_OFFSET + 2
  	MONO_MT_UINT16,     /* "Major" }, */
  	MONO_MT_UINT16,     /* "Minor" }, */
  	MONO_MT_UINT16,     /* "Build" }, */
  	MONO_MT_UINT16,     /* "Revision" }, */
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_BLOB_IDX,   /* "PublicKeyOrToken" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_STRING_IDX, /* "Culture" }, */
  	MONO_MT_BLOB_IDX,   /* "HashValue" }, */
  	MONO_MT_END,
  
  #define ASSEMBLYREFOS_SCHEMA_OFFSET ASSEMBLYREF_SCHEMA_OFFSET + 10
  	MONO_MT_UINT32,     /* "OSPlatformID" }, */
  	MONO_MT_UINT32,     /* "OSMajorVersion" }, */
  	MONO_MT_UINT32,     /* "OSMinorVersion" }, */
  	MONO_MT_TABLE_IDX,  /* "AssemblyRef:AssemblyRef" }, */
  	MONO_MT_END,
  
  #define ASSEMBLYREFPROC_SCHEMA_OFFSET ASSEMBLYREFOS_SCHEMA_OFFSET + 5
  	MONO_MT_UINT32,     /* "Processor" }, */
  	MONO_MT_TABLE_IDX,  /* "AssemblyRef:AssemblyRef" }, */
  	MONO_MT_END,
  
  #define CLASS_LAYOUT_SCHEMA_OFFSET ASSEMBLYREFPROC_SCHEMA_OFFSET + 3
  	MONO_MT_UINT16,     /* "PackingSize" }, */
  	MONO_MT_UINT32,     /* "ClassSize" }, */
  	MONO_MT_TABLE_IDX,  /* "Parent:TypeDef" }, */
  	MONO_MT_END,
  
  #define CONSTANT_SCHEMA_OFFSET CLASS_LAYOUT_SCHEMA_OFFSET + 4
  	MONO_MT_UINT8,      /* "Type" }, */
  	MONO_MT_UINT8,      /* "PaddingZero" }, */
  	MONO_MT_CONST_IDX,  /* "Parent" }, */
  	MONO_MT_BLOB_IDX,   /* "Value" }, */
  	MONO_MT_END,
  
  #define CUSTOM_ATTR_SCHEMA_OFFSET CONSTANT_SCHEMA_OFFSET + 5
  	MONO_MT_HASCAT_IDX, /* "Parent" }, */
  	MONO_MT_CAT_IDX,    /* "Type" }, */
  	MONO_MT_BLOB_IDX,   /* "Value" }, */
  	MONO_MT_END,
  
  #define DECL_SEC_SCHEMA_OFFSET CUSTOM_ATTR_SCHEMA_OFFSET + 4
  	MONO_MT_UINT16,     /* "Action" }, */
  	MONO_MT_HASDEC_IDX, /* "Parent" }, */
  	MONO_MT_BLOB_IDX,   /* "PermissionSet" }, */
  	MONO_MT_END,
  
  #define EVENTMAP_SCHEMA_OFFSET DECL_SEC_SCHEMA_OFFSET + 4
  	MONO_MT_TABLE_IDX,  /* "Parent:TypeDef" }, */
  	MONO_MT_TABLE_IDX,  /* "EventList:Event" }, */
  	MONO_MT_END,
  
  #define EVENT_SCHEMA_OFFSET EVENTMAP_SCHEMA_OFFSET + 3
  	MONO_MT_UINT16,     /* "EventFlags#EventAttribute" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_TDOR_IDX,  /* "EventType" }, TypeDef or TypeRef or TypeSpec  */
  	MONO_MT_END,
  
  #define EVENT_POINTER_SCHEMA_OFFSET EVENT_SCHEMA_OFFSET + 4
  	MONO_MT_TABLE_IDX,  /* "Event" }, */
  	MONO_MT_END,
  
  #define EXPORTED_TYPE_SCHEMA_OFFSET EVENT_POINTER_SCHEMA_OFFSET + 2
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_TABLE_IDX,  /* "TypeDefId" }, */
  	MONO_MT_STRING_IDX, /* "TypeName" }, */
  	MONO_MT_STRING_IDX, /* "TypeNameSpace" }, */
  	MONO_MT_IMPL_IDX,   /* "Implementation" }, */
  	MONO_MT_END,
  
  #define FIELD_SCHEMA_OFFSET EXPORTED_TYPE_SCHEMA_OFFSET + 6
  	MONO_MT_UINT16,     /* "Flags" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_END,
  
  #define FIELD_LAYOUT_SCHEMA_OFFSET FIELD_SCHEMA_OFFSET + 4
  	MONO_MT_UINT32,     /* "Offset" }, */
  	MONO_MT_TABLE_IDX,  /* "Field:Field" }, */
  	MONO_MT_END,
  
  #define FIELD_MARSHAL_SCHEMA_OFFSET FIELD_LAYOUT_SCHEMA_OFFSET + 3
  	MONO_MT_HFM_IDX,    /* "Parent" }, */
  	MONO_MT_BLOB_IDX,   /* "NativeType" }, */
  	MONO_MT_END,
  
  #define FIELD_RVA_SCHEMA_OFFSET FIELD_MARSHAL_SCHEMA_OFFSET + 3
  	MONO_MT_UINT32,     /* "RVA" }, */
  	MONO_MT_TABLE_IDX,  /* "Field:Field" }, */
  	MONO_MT_END,
  
  #define FIELD_POINTER_SCHEMA_OFFSET FIELD_RVA_SCHEMA_OFFSET + 3
  	MONO_MT_TABLE_IDX,  /* "Field" }, */
  	MONO_MT_END,
  
  #define FILE_SCHEMA_OFFSET FIELD_POINTER_SCHEMA_OFFSET + 2
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_BLOB_IDX,   /* "Value" },  */
  	MONO_MT_END,
  
  #define IMPLMAP_SCHEMA_OFFSET FILE_SCHEMA_OFFSET + 4
  	MONO_MT_UINT16,     /* "MappingFlag" }, */
  	MONO_MT_MF_IDX,     /* "MemberForwarded" }, */
  	MONO_MT_STRING_IDX, /* "ImportName" }, */
  	MONO_MT_TABLE_IDX,  /* "ImportScope:ModuleRef" }, */
  	MONO_MT_END,
  
  #define IFACEMAP_SCHEMA_OFFSET IMPLMAP_SCHEMA_OFFSET + 5
  	MONO_MT_TABLE_IDX,  /* "Class:TypeDef" },  */
  	MONO_MT_TDOR_IDX,  /* "Interface=TypeDefOrRef" }, */
  	MONO_MT_END,
  
  #define MANIFEST_SCHEMA_OFFSET IFACEMAP_SCHEMA_OFFSET + 3
  	MONO_MT_UINT32,     /* "Offset" }, */
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_IMPL_IDX,   /* "Implementation" }, */
  	MONO_MT_END,
  
  #define MEMBERREF_SCHEMA_OFFSET MANIFEST_SCHEMA_OFFSET + 5
  	MONO_MT_MRP_IDX,    /* "Class" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_END,
  
  #define METHOD_SCHEMA_OFFSET MEMBERREF_SCHEMA_OFFSET + 4
  	MONO_MT_UINT32,     /* "RVA" }, */
  	MONO_MT_UINT16,     /* "ImplFlags#MethodImplAttributes" }, */
  	MONO_MT_UINT16,     /* "Flags#MethodAttribute" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_TABLE_IDX,  /* "ParamList:Param" }, */
  	MONO_MT_END,
  
  #define METHOD_IMPL_SCHEMA_OFFSET METHOD_SCHEMA_OFFSET + 7
  	MONO_MT_TABLE_IDX,  /* "Class:TypeDef" }, */
  	MONO_MT_MDOR_IDX,   /* "MethodBody" }, */
  	MONO_MT_MDOR_IDX,   /* "MethodDeclaration" }, */
  	MONO_MT_END,
  
  #define METHOD_SEMA_SCHEMA_OFFSET METHOD_IMPL_SCHEMA_OFFSET + 4
  	MONO_MT_UINT16,     /* "MethodSemantic" }, */
  	MONO_MT_TABLE_IDX,  /* "Method:Method" }, */
  	MONO_MT_HS_IDX,     /* "Association" }, */
  	MONO_MT_END,
  
  #define METHOD_POINTER_SCHEMA_OFFSET METHOD_SEMA_SCHEMA_OFFSET + 4
  	MONO_MT_TABLE_IDX,  /* "Method" }, */
  	MONO_MT_END,
  
  #define MODULE_SCHEMA_OFFSET METHOD_POINTER_SCHEMA_OFFSET + 2
  	MONO_MT_UINT16,     /* "Generation" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_GUID_IDX,   /* "MVID" }, */
  	MONO_MT_GUID_IDX,   /* "EncID" }, */
  	MONO_MT_GUID_IDX,   /* "EncBaseID" }, */
  	MONO_MT_END,
  
  #define MODULEREF_SCHEMA_OFFSET MODULE_SCHEMA_OFFSET + 6
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_END,
  
  #define NESTED_CLASS_SCHEMA_OFFSET MODULEREF_SCHEMA_OFFSET + 2
  	MONO_MT_TABLE_IDX,  /* "NestedClass:TypeDef" }, */
  	MONO_MT_TABLE_IDX,  /* "EnclosingClass:TypeDef" }, */
  	MONO_MT_END,
  
  #define PARAM_SCHEMA_OFFSET NESTED_CLASS_SCHEMA_OFFSET + 3
  	MONO_MT_UINT16,     /* "Flags" }, */
  	MONO_MT_UINT16,     /* "Sequence" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_END,
  
  #define PARAM_POINTER_SCHEMA_OFFSET PARAM_SCHEMA_OFFSET + 4
  	MONO_MT_TABLE_IDX,  /* "Param" }, */
  	MONO_MT_END,
  
  #define PROPERTY_SCHEMA_OFFSET PARAM_POINTER_SCHEMA_OFFSET + 2
  	MONO_MT_UINT16,     /* "Flags" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_BLOB_IDX,   /* "Type" }, */
  	MONO_MT_END,
  
  #define PROPERTY_POINTER_SCHEMA_OFFSET PROPERTY_SCHEMA_OFFSET + 4
  	MONO_MT_TABLE_IDX, /* "Property" }, */
  	MONO_MT_END,
  
  #define PROPERTY_MAP_SCHEMA_OFFSET PROPERTY_POINTER_SCHEMA_OFFSET + 2
  	MONO_MT_TABLE_IDX,  /* "Parent:TypeDef" }, */
  	MONO_MT_TABLE_IDX,  /* "PropertyList:Property" }, */
  	MONO_MT_END,
  
  #define STDALON_SIG_SCHEMA_OFFSET PROPERTY_MAP_SCHEMA_OFFSET + 3
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_END,
  
  #define TYPEDEF_SCHEMA_OFFSET STDALON_SIG_SCHEMA_OFFSET + 2
  	MONO_MT_UINT32,     /* "Flags" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_STRING_IDX, /* "Namespace" }, */
  	MONO_MT_TDOR_IDX,   /* "Extends" }, */
  	MONO_MT_TABLE_IDX,  /* "FieldList:Field" }, */
  	MONO_MT_TABLE_IDX,  /* "MethodList:Method" }, */
  	MONO_MT_END,
  
  #define TYPEREF_SCHEMA_OFFSET TYPEDEF_SCHEMA_OFFSET + 7
  	MONO_MT_RS_IDX,     /* "ResolutionScope=ResolutionScope" }, */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_STRING_IDX, /* "Namespace" }, */
  	MONO_MT_END,
  
  #define TYPESPEC_SCHEMA_OFFSET TYPEREF_SCHEMA_OFFSET + 4
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_END,
  
  #define GENPARAM_SCHEMA_OFFSET TYPESPEC_SCHEMA_OFFSET + 2
  	MONO_MT_UINT16,     /* "Number" }, */
  	MONO_MT_UINT16,     /* "Flags" }, */
  	MONO_MT_TABLE_IDX,  /* "Owner" },  TypeDef or MethodDef */
  	MONO_MT_STRING_IDX, /* "Name" }, */
  	MONO_MT_END,
  
  #define METHOD_SPEC_SCHEMA_OFFSET GENPARAM_SCHEMA_OFFSET + 5
  	MONO_MT_MDOR_IDX,   /* "Method" }, */
  	MONO_MT_BLOB_IDX,   /* "Signature" }, */
  	MONO_MT_END,
  
  #define GEN_CONSTRAINT_SCHEMA_OFFSET METHOD_SPEC_SCHEMA_OFFSET + 3
  	MONO_MT_TABLE_IDX,  /* "GenericParam" }, */
  	MONO_MT_TDOR_IDX,   /* "Constraint" }, */
  	MONO_MT_END,
  
  #define NULL_SCHEMA_OFFSET GEN_CONSTRAINT_SCHEMA_OFFSET + 3
  	MONO_MT_END
  };
  
  /* Must be the same order as MONO_TABLE_* */
  const static unsigned char
  table_description [] = {
  	MODULE_SCHEMA_OFFSET,
  	TYPEREF_SCHEMA_OFFSET,
  	TYPEDEF_SCHEMA_OFFSET,
  	FIELD_POINTER_SCHEMA_OFFSET,
  	FIELD_SCHEMA_OFFSET,
  	METHOD_POINTER_SCHEMA_OFFSET,
  	METHOD_SCHEMA_OFFSET,
  	PARAM_POINTER_SCHEMA_OFFSET,
  	PARAM_SCHEMA_OFFSET,
  	IFACEMAP_SCHEMA_OFFSET,
  	MEMBERREF_SCHEMA_OFFSET, /* 0xa */
  	CONSTANT_SCHEMA_OFFSET,
  	CUSTOM_ATTR_SCHEMA_OFFSET,
  	FIELD_MARSHAL_SCHEMA_OFFSET,
  	DECL_SEC_SCHEMA_OFFSET,
  	CLASS_LAYOUT_SCHEMA_OFFSET,
  	FIELD_LAYOUT_SCHEMA_OFFSET, /* 0x10 */
  	STDALON_SIG_SCHEMA_OFFSET,
  	EVENTMAP_SCHEMA_OFFSET,
  	EVENT_POINTER_SCHEMA_OFFSET,
  	EVENT_SCHEMA_OFFSET,
  	PROPERTY_MAP_SCHEMA_OFFSET,
  	PROPERTY_POINTER_SCHEMA_OFFSET,
  	PROPERTY_SCHEMA_OFFSET,
  	METHOD_SEMA_SCHEMA_OFFSET,
  	METHOD_IMPL_SCHEMA_OFFSET,
  	MODULEREF_SCHEMA_OFFSET, /* 0x1a */
  	TYPESPEC_SCHEMA_OFFSET,
  	IMPLMAP_SCHEMA_OFFSET,
  	FIELD_RVA_SCHEMA_OFFSET,
  	NULL_SCHEMA_OFFSET,
  	NULL_SCHEMA_OFFSET,
  	ASSEMBLY_SCHEMA_OFFSET, /* 0x20 */
  	ASSEMBLYPROC_SCHEMA_OFFSET,
  	ASSEMBLYOS_SCHEMA_OFFSET,
  	ASSEMBLYREF_SCHEMA_OFFSET,
  	ASSEMBLYREFPROC_SCHEMA_OFFSET,
  	ASSEMBLYREFOS_SCHEMA_OFFSET,
  	FILE_SCHEMA_OFFSET,
  	EXPORTED_TYPE_SCHEMA_OFFSET,
  	MANIFEST_SCHEMA_OFFSET,
  	NESTED_CLASS_SCHEMA_OFFSET,
  	GENPARAM_SCHEMA_OFFSET, /* 0x2a */
  	METHOD_SPEC_SCHEMA_OFFSET,
  	GEN_CONSTRAINT_SCHEMA_OFFSET
  };
  
  #ifdef HAVE_ARRAY_ELEM_INIT
  #define MSGSTRFIELD(line) MSGSTRFIELD1(line)
  #define MSGSTRFIELD1(line) str##line
  static const struct msgstr_t {
  #define TABLEDEF(a,b) char MSGSTRFIELD(__LINE__) [sizeof (b)];
  #include "mono/cil/tables.def"
  #undef TABLEDEF
  } tablestr = {
  #define TABLEDEF(a,b) b,
  #include "mono/cil/tables.def"
  #undef TABLEDEF
  };
  static const gint16 tableidx [] = {
  #define TABLEDEF(a,b) [a] = offsetof (struct msgstr_t, MSGSTRFIELD(__LINE__)),
  #include "mono/cil/tables.def"
  #undef TABLEDEF
  };
  
  #else
  #define TABLEDEF(a,b) b,
  static const char* const
  mono_tables_names [] = {
  #include "mono/cil/tables.def"
  	NULL
  };
  
  #endif
  
  /**
   * mono_meta_table_name:
   * @table: table index
   *
   * Returns the name of the given ECMA metadata logical format table
   * as described in ECMA 335, Partition II, Section 22.
   * 
   * Returns: the name for the @table index
   */
  const char *
  mono_meta_table_name (int table)
  {
  	if ((table < 0) || (table > MONO_TABLE_LAST))
  		return "";
  
  #ifdef HAVE_ARRAY_ELEM_INIT
  	return (const char*)&tablestr + tableidx [table];
  #else
  	return mono_tables_names [table];
  #endif
  }
  
  /* The guy who wrote the spec for this should not be allowed near a
   * computer again.
   
  If  e is a coded token(see clause 23.1.7) that points into table ti out of n possible tables t0, .. tn-1, 
  then it is stored as e << (log n) & tag{ t0, .. tn-1}[ ti] using 2 bytes if the maximum number of 
  rows of tables t0, ..tn-1, is less than 2^16 - (log n), and using 4 bytes otherwise. The family of 
  finite maps tag{ t0, ..tn-1} is defined below. Note that to decode a physical row, you need the 
  inverse of this mapping.
  
   */
  #define rtsize(s,b) (((s) < (1 << (b)) ? 2 : 4))
  #define idx_size(tableidx) (meta->tables [(tableidx)].rows < 65536 ? 2 : 4)
  
  /* Reference: Partition II - 23.2.6 */
  /*
   * mono_metadata_compute_size:
   * @meta: metadata context
   * @tableindex: metadata table number
   * @result_bitfield: pointer to guint32 where to store additional info
   * 
   * mono_metadata_compute_size() computes the lenght in bytes of a single
   * row in a metadata table. The size of each column is encoded in the
   * @result_bitfield return value along with the number of columns in the table.
   * the resulting bitfield should be handed to the mono_metadata_table_size()
   * and mono_metadata_table_count() macros.
   * This is a Mono runtime internal only function.
   */
  int
  mono_metadata_compute_size (MonoImage *meta, int tableindex, guint32 *result_bitfield)
  {
  	guint32 bitfield = 0;
  	int size = 0, field_size = 0;
  	int i, n, code;
  	int shift = 0;
  	const unsigned char *description = TableSchemas + table_description [tableindex];
  
  	for (i = 0; (code = description [i]) != MONO_MT_END; i++){
  		switch (code){
  		case MONO_MT_UINT32:
  			field_size = 4; break;
  			
  		case MONO_MT_UINT16:
  			field_size = 2; break;
  			
  		case MONO_MT_UINT8:
  			field_size = 1; break;
  			
  		case MONO_MT_BLOB_IDX:
  			field_size = meta->idx_blob_wide ? 4 : 2; break;
  			
  		case MONO_MT_STRING_IDX:
  			field_size = meta->idx_string_wide ? 4 : 2; break;
  			
  		case MONO_MT_GUID_IDX:
  			field_size = meta->idx_guid_wide ? 4 : 2; break;
  
  		case MONO_MT_TABLE_IDX:
  			/* Uhm, a table index can point to other tables besides the current one
  			 * so, it's not correct to use the rowcount of the current table to
  			 * get the size for this column - lupus 
  			 */
  			switch (tableindex) {
  			case MONO_TABLE_ASSEMBLYREFOS:
  				g_assert (i == 3);
  				field_size = idx_size (MONO_TABLE_ASSEMBLYREF); break;
  			case MONO_TABLE_ASSEMBLYREFPROCESSOR:
  				g_assert (i == 1);
  				field_size = idx_size (MONO_TABLE_ASSEMBLYREF); break;
  			case MONO_TABLE_CLASSLAYOUT:
  				g_assert (i == 2);
  				field_size = idx_size (MONO_TABLE_TYPEDEF); break;
  			case MONO_TABLE_EVENTMAP:
  				g_assert (i == 0 || i == 1);
  				field_size = i ? idx_size (MONO_TABLE_EVENT):
  					idx_size(MONO_TABLE_TYPEDEF); 
  				break;
  			case MONO_TABLE_EVENT_POINTER:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_EVENT); break;
  			case MONO_TABLE_EXPORTEDTYPE:
  				g_assert (i == 1);
  				/* the index is in another metadata file, so it must be 4 */
  				field_size = 4; break;
  			case MONO_TABLE_FIELDLAYOUT:
  				g_assert (i == 1);
  				field_size = idx_size (MONO_TABLE_FIELD); break;
  			case MONO_TABLE_FIELDRVA:
  				g_assert (i == 1);
  				field_size = idx_size (MONO_TABLE_FIELD); break;
  			case MONO_TABLE_FIELD_POINTER:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_FIELD); break;
  			case MONO_TABLE_IMPLMAP:
  				g_assert (i == 3);
  				field_size = idx_size (MONO_TABLE_MODULEREF); break;
  			case MONO_TABLE_INTERFACEIMPL:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_TYPEDEF); break;
  			case MONO_TABLE_METHOD:
  				g_assert (i == 5);
  				field_size = idx_size (MONO_TABLE_PARAM); break;
  			case MONO_TABLE_METHODIMPL:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_TYPEDEF); break;
  			case MONO_TABLE_METHODSEMANTICS:
  				g_assert (i == 1);
  				field_size = idx_size (MONO_TABLE_METHOD); break;
  			case MONO_TABLE_METHOD_POINTER:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_METHOD); break;
  			case MONO_TABLE_NESTEDCLASS:
  				g_assert (i == 0 || i == 1);
  				field_size = idx_size (MONO_TABLE_TYPEDEF); break;
  			case MONO_TABLE_PARAM_POINTER:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_PARAM); break;
  			case MONO_TABLE_PROPERTYMAP:
  				g_assert (i == 0 || i == 1);
  				field_size = i ? idx_size (MONO_TABLE_PROPERTY):
  					idx_size(MONO_TABLE_TYPEDEF); 
  				break;
  			case MONO_TABLE_PROPERTY_POINTER:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_PROPERTY); break;
  			case MONO_TABLE_TYPEDEF:
  				g_assert (i == 4 || i == 5);
  				field_size = i == 4 ? idx_size (MONO_TABLE_FIELD):
  					idx_size(MONO_TABLE_METHOD);
  				break;
  			case MONO_TABLE_GENERICPARAM:
  				g_assert (i == 2);
  				n = MAX (meta->tables [MONO_TABLE_METHOD].rows, meta->tables [MONO_TABLE_TYPEDEF].rows);
  				/*This is a coded token for 2 tables, so takes 1 bit */
  				field_size = rtsize (n, 16 - MONO_TYPEORMETHOD_BITS);
  				break;
  			case MONO_TABLE_GENERICPARAMCONSTRAINT:
  				g_assert (i == 0);
  				field_size = idx_size (MONO_TABLE_GENERICPARAM);
  				break;
  				
  			default:
  				g_error ("Can't handle MONO_MT_TABLE_IDX for table %d element %d", tableindex, i);
  			}
  			break;
  
  			/*
  			 * HasConstant: ParamDef, FieldDef, Property
  			 */
  		case MONO_MT_CONST_IDX:
  			n = MAX (meta->tables [MONO_TABLE_PARAM].rows,
  				 meta->tables [MONO_TABLE_FIELD].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_PROPERTY].rows);
  
  			/* 2 bits to encode tag */
  			field_size = rtsize (n, 16-2);
  			break;
  
  			/*
  			 * HasCustomAttribute: points to any table but
  			 * itself.
  			 */
  		case MONO_MT_HASCAT_IDX:
  			/*
  			 * We believe that since the signature and
  			 * permission are indexing the Blob heap,
  			 * we should consider the blob size first
  			 */
  			/* I'm not a believer - lupus
  			if (meta->idx_blob_wide){
  				field_size = 4;
  				break;
  			}*/
  			
  			n = MAX (meta->tables [MONO_TABLE_METHOD].rows,
  				 meta->tables [MONO_TABLE_FIELD].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPEDEF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_PARAM].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_INTERFACEIMPL].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MEMBERREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MODULE].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_DECLSECURITY].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_PROPERTY].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_EVENT].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_STANDALONESIG].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MODULEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPESPEC].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_ASSEMBLY].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_ASSEMBLYREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_FILE].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_EXPORTEDTYPE].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MANIFESTRESOURCE].rows);
  
  			/* 5 bits to encode */
  			field_size = rtsize (n, 16-5);
  			break;
  
  			/*
  			 * CustomAttributeType: TypeDef, TypeRef, MethodDef, 
  			 * MemberRef and String.  
  			 */
  		case MONO_MT_CAT_IDX:
  			/* String is a heap, if it is wide, we know the size */
  			/* See above, nope. 
  			if (meta->idx_string_wide){
  				field_size = 4;
  				break;
  			}*/
  			
  			n = MAX (meta->tables [MONO_TABLE_TYPEREF].rows,
  				 meta->tables [MONO_TABLE_TYPEDEF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_METHOD].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MEMBERREF].rows);
  
  			/* 3 bits to encode */
  			field_size = rtsize (n, 16-3);
  			break;
  
  			/*
  			 * HasDeclSecurity: Typedef, MethodDef, Assembly
  			 */
  		case MONO_MT_HASDEC_IDX:
  			n = MAX (meta->tables [MONO_TABLE_TYPEDEF].rows,
  				 meta->tables [MONO_TABLE_METHOD].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_ASSEMBLY].rows);
  
  			/* 2 bits to encode */
  			field_size = rtsize (n, 16-2);
  			break;
  
  			/*
  			 * Implementation: File, AssemblyRef, ExportedType
  			 */
  		case MONO_MT_IMPL_IDX:
  			n = MAX (meta->tables [MONO_TABLE_FILE].rows,
  				 meta->tables [MONO_TABLE_ASSEMBLYREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_EXPORTEDTYPE].rows);
  
  			/* 2 bits to encode tag */
  			field_size = rtsize (n, 16-2);
  			break;
  
  			/*
  			 * HasFieldMarshall: FieldDef, ParamDef
  			 */
  		case MONO_MT_HFM_IDX:
  			n = MAX (meta->tables [MONO_TABLE_FIELD].rows,
  				 meta->tables [MONO_TABLE_PARAM].rows);
  
  			/* 1 bit used to encode tag */
  			field_size = rtsize (n, 16-1);
  			break;
  
  			/*
  			 * MemberForwarded: FieldDef, MethodDef
  			 */
  		case MONO_MT_MF_IDX:
  			n = MAX (meta->tables [MONO_TABLE_FIELD].rows,
  				 meta->tables [MONO_TABLE_METHOD].rows);
  
  			/* 1 bit used to encode tag */
  			field_size = rtsize (n, 16-1);
  			break;
  
  			/*
  			 * TypeDefOrRef: TypeDef, ParamDef, TypeSpec
  			 * LAMESPEC
  			 * It is TypeDef, _TypeRef_, TypeSpec, instead.
  			 */
  		case MONO_MT_TDOR_IDX:
  			n = MAX (meta->tables [MONO_TABLE_TYPEDEF].rows,
  				 meta->tables [MONO_TABLE_TYPEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPESPEC].rows);
  
  			/* 2 bits to encode */
  			field_size = rtsize (n, 16-2);
  			break;
  
  			/*
  			 * MemberRefParent: TypeDef, TypeRef, MethodDef, ModuleRef, TypeSpec, MemberRef
  			 */
  		case MONO_MT_MRP_IDX:
  			n = MAX (meta->tables [MONO_TABLE_TYPEDEF].rows,
  				 meta->tables [MONO_TABLE_TYPEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_METHOD].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_MODULEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPESPEC].rows);
  
  			/* 3 bits to encode */
  			field_size = rtsize (n, 16 - 3);
  			break;
  			
  			/*
  			 * MethodDefOrRef: MethodDef, MemberRef
  			 */
  		case MONO_MT_MDOR_IDX:
  			n = MAX (meta->tables [MONO_TABLE_METHOD].rows,
  				 meta->tables [MONO_TABLE_MEMBERREF].rows);
  
  			/* 1 bit used to encode tag */
  			field_size = rtsize (n, 16-1);
  			break;
  			
  			/*
  			 * HasSemantics: Property, Event
  			 */
  		case MONO_MT_HS_IDX:
  			n = MAX (meta->tables [MONO_TABLE_PROPERTY].rows,
  				 meta->tables [MONO_TABLE_EVENT].rows);
  
  			/* 1 bit used to encode tag */
  			field_size = rtsize (n, 16-1);
  			break;
  
  			/*
  			 * ResolutionScope: Module, ModuleRef, AssemblyRef, TypeRef
  			 */
  		case MONO_MT_RS_IDX:
  			n = MAX (meta->tables [MONO_TABLE_MODULE].rows,
  				 meta->tables [MONO_TABLE_MODULEREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_ASSEMBLYREF].rows);
  			n = MAX (n, meta->tables [MONO_TABLE_TYPEREF].rows);
  
  			/* 2 bits used to encode tag (ECMA spec claims 3) */
  			field_size = rtsize (n, 16 - 2);
  			break;
  		}
  
  		/*
  		 * encode field size as follows (we just need to
  		 * distinguish them).
  		 *
  		 * 4 -> 3
  		 * 2 -> 1
  		 * 1 -> 0
  		 */
  		bitfield |= (field_size-1) << shift;
  		shift += 2;
  		size += field_size;
  		/*g_print ("table %02x field %d size %d\n", tableindex, i, field_size);*/
  	}
  
  	*result_bitfield = (i << 24) | bitfield;
  	return size;
  }
  
  /**
   * mono_metadata_compute_table_bases:
   * @meta: metadata context to compute table values
   *
   * Computes the table bases for the metadata structure.
   * This is an internal function used by the image loader code.
   */
  void
  mono_metadata_compute_table_bases (MonoImage *meta)
  {
  	int i;
  	const char *base = meta->tables_base;
  	
  	for (i = 0; i < MONO_TABLE_NUM; i++) {
  		MonoTableInfo *table = &meta->tables [i];
  		if (table->rows == 0)
  			continue;
  
  		table->row_size = mono_metadata_compute_size (meta, i, &table->size_bitfield);
  		table->base = base;
  		base += table->rows * table->row_size;
  	}
  }
  
  /**
   * mono_metadata_locate:
   * @meta: metadata context
   * @table: table code.
   * @idx: index of element to retrieve from @table.
   *
   * Returns: a pointer to the @idx element in the metadata table
   * whose code is @table.
   */
  const char *
  mono_metadata_locate (MonoImage *meta, int table, int idx)
  {
  	/* idx == 0 refers always to NULL */
  	g_return_val_if_fail (idx > 0 && idx <= meta->tables [table].rows, ""); /*FIXME shouldn't we return NULL here?*/
  	   
  	return meta->tables [table].base + (meta->tables [table].row_size * (idx - 1));
  }
  
  /**
   * mono_metadata_locate_token:
   * @meta: metadata context
   * @token: metadata token
   *
   * Returns: a pointer to the data in the metadata represented by the
   * token #token.
   */
  const char *
  mono_metadata_locate_token (MonoImage *meta, guint32 token)
  {
  	return mono_metadata_locate (meta, token >> 24, token & 0xffffff);
  }
  
  /**
   * mono_metadata_string_heap:
   * @meta: metadata context
   * @index: index into the string heap.
   *
   * Returns: an in-memory pointer to the @index in the string heap.
   */
  const char *
  mono_metadata_string_heap (MonoImage *meta, guint32 index)
  {
  	g_assert (index < meta->heap_strings.size);
  	g_return_val_if_fail (index < meta->heap_strings.size, "");
  	return meta->heap_strings.data + index;
  }
  
  /**
   * mono_metadata_user_string:
   * @meta: metadata context
   * @index: index into the user string heap.
   *
   * Returns: an in-memory pointer to the @index in the user string heap ("#US").
   */
  const char *
  mono_metadata_user_string (MonoImage *meta, guint32 index)
  {
  	g_assert (index < meta->heap_us.size);
  	g_return_val_if_fail (index < meta->heap_us.size, "");
  	return meta->heap_us.data + index;
  }
  
  /**
   * mono_metadata_blob_heap:
   * @meta: metadata context
   * @index: index into the blob.
   *
   * Returns: an in-memory pointer to the @index in the Blob heap.
   */
  const char *
  mono_metadata_blob_heap (MonoImage *meta, guint32 index)
  {
  	g_assert (index < meta->heap_blob.size);
  	g_return_val_if_fail (index < meta->heap_blob.size, "");/*FIXME shouldn't we return NULL and check for index == 0?*/
  	return meta->heap_blob.data + index;
  }
  
  /**
   * mono_metadata_guid_heap:
   * @meta: metadata context
   * @index: index into the guid heap.
   *
   * Returns: an in-memory pointer to the @index in the guid heap.
   */
  const char *
  mono_metadata_guid_heap (MonoImage *meta, guint32 index)
  {
  	--index;
  	index *= 16; /* adjust for guid size and 1-based index */
  	g_return_val_if_fail (index < meta->heap_guid.size, "");
  	return meta->heap_guid.data + index;
  }
  
  static const unsigned char *
  dword_align (const unsigned char *ptr)
  {
  #if SIZEOF_VOID_P == 8
  	return (const unsigned char *) (((guint64) (ptr + 3)) & ~3);
  #else
  	return (const unsigned char *) (((guint32) (ptr + 3)) & ~3);
  #endif
  }
  
  /**
   * mono_metadata_decode_row:
   * @t: table to extract information from.
   * @idx: index in table.
   * @res: array of @res_size cols to store the results in
   *
   * This decompresses the metadata element @idx in table @t
   * into the guint32 @res array that has res_size elements
   */
  void
  mono_metadata_decode_row (const MonoTableInfo *t, int idx, guint32 *res, int res_size)
  {
  	guint32 bitfield = t->size_bitfield;
  	int i, count = mono_metadata_table_count (bitfield);
  	const char *data;
  
  	g_assert (idx < t->rows);
  	g_assert (idx >= 0);
  	data = t->base + idx * t->row_size;
  	
  	g_assert (res_size == count);
  
  	for (i = 0; i < count; i++) {
  		int n = mono_metadata_table_size (bitfield, i);
  
  		switch (n){
  		case 1:
  			res [i] = *data; break;
  		case 2:
  			res [i] = read16 (data); break;
  		case 4:
  			res [i] = read32 (data); break;
  		default:
  			g_assert_not_reached ();
  		}
  		data += n;
  	}
  }
  
  /**
   * mono_metadata_decode_row_col:
   * @t: table to extract information from.
   * @idx: index for row in table.
   * @col: column in the row.
   *
   * This function returns the value of column @col from the @idx
   * row in the table @t.
   */
  guint32
  mono_metadata_decode_row_col (const MonoTableInfo *t, int idx, guint col)
  {
  	guint32 bitfield = t->size_bitfield;
  	int i;
  	register const char *data; 
  	register int n;
  	
  	g_assert (idx < t->rows);
  	g_assert (col < mono_metadata_table_count (bitfield));
  	data = t->base + idx * t->row_size;
  
  	n = mono_metadata_table_size (bitfield, 0);
  	for (i = 0; i < col; ++i) {
  		data += n;
  		n = mono_metadata_table_size (bitfield, i + 1);
  	}
  	switch (n) {
  	case 1:
  		return *data;
  	case 2:
  		return read16 (data);
  	case 4:
  		return read32 (data);
  	default:
  		g_assert_not_reached ();
  	}
  	return 0;
  }
  
  /**
   * mono_metadata_decode_blob_size:
   * @ptr: pointer to a blob object
   * @rptr: the new position of the pointer
   *
   * This decodes a compressed size as described by 23.1.4 (a blob or user string object)
   *
   * Returns: the size of the blob object
   */
  guint32
  mono_metadata_decode_blob_size (const char *xptr, const char **rptr)
  {
  	const unsigned char *ptr = (const unsigned char *)xptr;
  	guint32 size;
  	
  	if ((*ptr & 0x80) == 0){
  		size = ptr [0] & 0x7f;
  		ptr++;
  	} else if ((*ptr & 0x40) == 0){
  		size = ((ptr [0] & 0x3f) << 8) + ptr [1];
  		ptr += 2;
  	} else {
  		size = ((ptr [0] & 0x1f) << 24) +
  			(ptr [1] << 16) +
  			(ptr [2] << 8) +
  			ptr [3];
  		ptr += 4;
  	}
  	if (rptr)
  		*rptr = (char*)ptr;
  	return size;
  }
  
  /**
   * mono_metadata_decode_value:
   * @ptr: pointer to decode from
   * @rptr: the new position of the pointer
   *
   * This routine decompresses 32-bit values as specified in the "Blob and
   * Signature" section (22.2)
   *
   * Returns: the decoded value
   */
  guint32
  mono_metadata_decode_value (const char *_ptr, const char **rptr)
  {
  	const unsigned char *ptr = (const unsigned char *) _ptr;
  	unsigned char b = *ptr;
  	guint32 len;
  	
  	if ((b & 0x80) == 0){
  		len = b;
  		++ptr;
  	} else if ((b & 0x40) == 0){
  		len = ((b & 0x3f) << 8 | ptr [1]);
  		ptr += 2;
  	} else {
  		len = ((b & 0x1f) << 24) |
  			(ptr [1] << 16) |
  			(ptr [2] << 8) |
  			ptr [3];
  		ptr += 4;
  	}
  	if (rptr)
  		*rptr = (char*)ptr;
  	
  	return len;
  }
  
  /**
   * mono_metadata_decode_signed_value:
   * @ptr: pointer to decode from
   * @rptr: the new position of the pointer
   *
   * This routine decompresses 32-bit signed values
   * (not specified in the spec)
   *
   * Returns: the decoded value
   */
  gint32
  mono_metadata_decode_signed_value (const char *ptr, const char **rptr)
  {
  	guint32 uval = mono_metadata_decode_value (ptr, rptr);
  	gint32 ival = uval >> 1;
  	if (!(uval & 1))
  		return ival;
  	/* ival is a truncated 2's complement negative number.  */
  	if (ival < 0x40)
  		/* 6 bits = 7 bits for compressed representation (top bit is '0') - 1 sign bit */
  		return ival - 0x40;
  	if (ival < 0x2000)
  		/* 13 bits = 14 bits for compressed representation (top bits are '10') - 1 sign bit */
  		return ival - 0x2000;
  	if (ival < 0x10000000)
  		/* 28 bits = 29 bits for compressed representation (top bits are '110') - 1 sign bit */
  		return ival - 0x10000000;
  	g_assert (ival < 0x20000000);
  	g_warning ("compressed signed value appears to use 29 bits for compressed representation: %x (raw: %8x)", ival, uval);
  	return ival - 0x20000000;
  }
  
  /* 
   * Translates the given 1-based index into the Method, Field, Event, or Param tables
   * using the *Ptr tables in uncompressed metadata, if they are available.
   *
   * FIXME: The caller is not forced to call this function, which is error-prone, since 
   * forgetting to call it would only show up as a bug on uncompressed metadata.
   */
  guint32
  mono_metadata_translate_token_index (MonoImage *image, int table, guint32 idx)
  {
  	if (!image->uncompressed_metadata)
  		return idx;
  
  	switch (table) {
  	case MONO_TABLE_METHOD:
  		if (image->tables [MONO_TABLE_METHOD_POINTER].rows)
  			return mono_metadata_decode_row_col (&image->tables [MONO_TABLE_METHOD_POINTER], idx - 1, MONO_METHOD_POINTER_METHOD);
  		else
  			return idx;
  	case MONO_TABLE_FIELD:
  		if (image->tables [MONO_TABLE_FIELD_POINTER].rows)
  			return mono_metadata_decode_row_col (&image->tables [MONO_TABLE_FIELD_POINTER], idx - 1, MONO_FIELD_POINTER_FIELD);
  		else
  			return idx;
  	case MONO_TABLE_EVENT:
  		if (image->tables [MONO_TABLE_EVENT_POINTER].rows)
  			return mono_metadata_decode_row_col (&image->tables [MONO_TABLE_EVENT_POINTER], idx - 1, MONO_EVENT_POINTER_EVENT);
  		else
  			return idx;
  	case MONO_TABLE_PROPERTY:
  		if (image->tables [MONO_TABLE_PROPERTY_POINTER].rows)
  			return mono_metadata_decode_row_col (&image->tables [MONO_TABLE_PROPERTY_POINTER], idx - 1, MONO_PROPERTY_POINTER_PROPERTY);
  		else
  			return idx;
  	case MONO_TABLE_PARAM:
  		if (image->tables [MONO_TABLE_PARAM_POINTER].rows)
  			return mono_metadata_decode_row_col (&image->tables [MONO_TABLE_PARAM_POINTER], idx - 1, MONO_PARAM_POINTER_PARAM);
  		else
  			return idx;
  	default:
  		return idx;
  	}
  }
  
  /**
   * mono_metadata_decode_table_row:
   *
   *   Same as mono_metadata_decode_row, but takes an IMAGE+TABLE ID pair, and takes
   * uncompressed metadata into account, so it should be used to access the
   * Method, Field, Param and Event tables when the access is made from metadata, i.e.
   * IDX is retrieved from a metadata table, like MONO_TYPEDEF_FIELD_LIST.
   */
  void
  mono_metadata_decode_table_row (MonoImage *image, int table, int idx, guint32 *res, int res_size)
  {
  	if (image->uncompressed_metadata)
  		idx = mono_metadata_translate_token_index (image, table, idx + 1) - 1;
  
  	mono_metadata_decode_row (&image->tables [table], idx, res, res_size);
  }
  
  /**
   * mono_metadata_decode_table_row_col:
   *
   *   Same as mono_metadata_decode_row_col, but takes an IMAGE+TABLE ID pair, and takes
   * uncompressed metadata into account, so it should be used to access the
   * Method, Field, Param and Event tables.
   */
  guint32 mono_metadata_decode_table_row_col (MonoImage *image, int table, int idx, guint col)
  {
  	if (image->uncompressed_metadata)
  		idx = mono_metadata_translate_token_index (image, table, idx + 1) - 1;
  
  	return mono_metadata_decode_row_col (&image->tables [table], idx, col);
  }
  
  /*
   * mono_metadata_parse_typedef_or_ref:
   * @m: a metadata context.
   * @ptr: a pointer to an encoded TypedefOrRef in @m
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Returns: a token valid in the @m metadata decoded from
   * the compressed representation.
   */
  guint32
  mono_metadata_parse_typedef_or_ref (MonoImage *m, const char *ptr, const char **rptr)
  {
  	guint32 token;
  	token = mono_metadata_decode_value (ptr, &ptr);
  	if (rptr)
  		*rptr = ptr;
  	return mono_metadata_token_from_dor (token);
  }
  
  /*
   * mono_metadata_parse_custom_mod:
   * @m: a metadata context.
   * @dest: storage where the info about the custom modifier is stored (may be NULL)
   * @ptr: a pointer to (possibly) the start of a custom modifier list
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Checks if @ptr points to a type custom modifier compressed representation.
   *
   * Returns: #TRUE if a custom modifier was found, #FALSE if not.
   */
  int
  mono_metadata_parse_custom_mod (MonoImage *m, MonoCustomMod *dest, const char *ptr, const char **rptr)
  {
  	MonoCustomMod local;
  	if ((*ptr == MONO_TYPE_CMOD_OPT) || (*ptr == MONO_TYPE_CMOD_REQD)) {
  		if (!dest)
  			dest = &local;
  		dest->required = *ptr == MONO_TYPE_CMOD_REQD ? 1 : 0;
  		dest->token = mono_metadata_parse_typedef_or_ref (m, ptr + 1, rptr);
  		return TRUE;
  	}
  	return FALSE;
  }
  
  /*
   * mono_metadata_parse_array_internal:
   * @m: a metadata context.
   * @transient: whenever to allocate data from the heap
   * @ptr: a pointer to an encoded array description.
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Decodes the compressed array description found in the metadata @m at @ptr.
   *
   * Returns: a #MonoArrayType structure describing the array type
   * and dimensions. Memory is allocated from the heap or from the image mempool, depending
   * on the value of @transient.
   *
   * LOCKING: Acquires the loader lock
   */
  static MonoArrayType *
  mono_metadata_parse_array_internal (MonoImage *m, MonoGenericContainer *container,
  									gboolean transient, const char *ptr, const char **rptr)
  {
  	int i;
  	MonoArrayType *array;
  	MonoType *etype;
  	
  	array = transient ? g_malloc0 (sizeof (MonoArrayType)) : mono_image_alloc0 (m, sizeof (MonoArrayType));
  	etype = mono_metadata_parse_type_full (m, container, MONO_PARSE_TYPE, 0, ptr, &ptr);
  	if (!etype)
  		return NULL;
  	array->eklass = mono_class_from_mono_type (etype);
  	array->rank = mono_metadata_decode_value (ptr, &ptr);
  
  	array->numsizes = mono_metadata_decode_value (ptr, &ptr);
  	if (array->numsizes)
  		array->sizes = transient ? g_malloc0 (sizeof (int) * array->numsizes) : mono_image_alloc0 (m, sizeof (int) * array->numsizes);
  	for (i = 0; i < array->numsizes; ++i)
  		array->sizes [i] = mono_metadata_decode_value (ptr, &ptr);
  
  	array->numlobounds = mono_metadata_decode_value (ptr, &ptr);
  	if (array->numlobounds)
  		array->lobounds = transient ? g_malloc0 (sizeof (int) * array->numlobounds) : mono_image_alloc0 (m, sizeof (int) * array->numlobounds);
  	for (i = 0; i < array->numlobounds; ++i)
  		array->lobounds [i] = mono_metadata_decode_signed_value (ptr, &ptr);
  
  	if (rptr)
  		*rptr = ptr;
  	return array;
  }
  
  MonoArrayType *
  mono_metadata_parse_array_full (MonoImage *m, MonoGenericContainer *container,
  								const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_array_internal (m, container, FALSE, ptr, rptr);
  }
  
  MonoArrayType *
  mono_metadata_parse_array (MonoImage *m, const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_array_full (m, NULL, ptr, rptr);
  }
  
  /*
   * mono_metadata_free_array:
   * @array: array description
   *
   * Frees the array description returned from mono_metadata_parse_array().
   */
  void
  mono_metadata_free_array (MonoArrayType *array)
  {
  	g_free (array->sizes);
  	g_free (array->lobounds);
  	g_free (array);
  }
  
  /*
   * need to add common field and param attributes combinations:
   * [out] param
   * public static
   * public static literal
   * private
   * private static
   * private static literal
   */
  static const MonoType
  builtin_types[] = {
  	/* data, attrs, type,              nmods, byref, pinned */
  	{{NULL}, 0,     MONO_TYPE_VOID,    0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_BOOLEAN, 0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_BOOLEAN, 0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_CHAR,    0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_CHAR,    0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_I1,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I1,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_U1,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_U1,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_I2,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I2,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_U2,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_U2,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_I4,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I4,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_U4,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_U4,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_I8,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I8,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_U8,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_U8,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_R4,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_R4,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_R8,      0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_R8,      0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_STRING,  0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_STRING,  0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_OBJECT,  0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_OBJECT,  0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_TYPEDBYREF,  0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I,       0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_I,       0,     1,     0},
  	{{NULL}, 0,     MONO_TYPE_U,       0,     0,     0},
  	{{NULL}, 0,     MONO_TYPE_U,       0,     1,     0},
  };
  
  #define NBUILTIN_TYPES() (sizeof (builtin_types) / sizeof (builtin_types [0]))
  
  static GHashTable *type_cache = NULL;
  static int next_generic_inst_id = 0;
  
  /* Protected by image_sets_mutex */
  static MonoImageSet *mscorlib_image_set;
  /* Protected by image_sets_mutex */
  static GPtrArray *image_sets;
  static CRITICAL_SECTION image_sets_mutex;
  
  static guint mono_generic_class_hash (gconstpointer data);
  
  /*
   * MonoTypes with modifies are never cached, so we never check or use that field.
   */
  static guint
  mono_type_hash (gconstpointer data)
  {
  	const MonoType *type = (const MonoType *) data;
  	if (type->type == MONO_TYPE_GENERICINST)
  		return mono_generic_class_hash (type->data.generic_class);
  	else
  		return type->type | (type->byref << 8) | (type->attrs << 9);
  }
  
  static gint
  mono_type_equal (gconstpointer ka, gconstpointer kb)
  {
  	const MonoType *a = (const MonoType *) ka;
  	const MonoType *b = (const MonoType *) kb;
  	
  	if (a->type != b->type || a->byref != b->byref || a->attrs != b->attrs || a->pinned != b->pinned)
  		return 0;
  	/* need other checks */
  	return 1;
  }
  
  guint
  mono_metadata_generic_inst_hash (gconstpointer data)
  {
  	const MonoGenericInst *ginst = (const MonoGenericInst *) data;
  	guint hash = 0;
  	int i;
  	
  	for (i = 0; i < ginst->type_argc; ++i) {
  		hash *= 13;
  		hash += mono_metadata_type_hash (ginst->type_argv [i]);
  	}
  
  	return hash ^ (ginst->is_open << 8);
  }
  
  static gboolean
  mono_generic_inst_equal_full (const MonoGenericInst *a, const MonoGenericInst *b, gboolean signature_only)
  {
  	int i;
  
  #ifndef MONO_SMALL_CONFIG
  	if (a->id && b->id) {
  		if (a->id == b->id)
  			return TRUE;
  		if (!signature_only)
  			return FALSE;
  	}
  #endif
  
  	if (a->is_open != b->is_open || a->type_argc != b->type_argc)
  		return FALSE;
  	for (i = 0; i < a->type_argc; ++i) {
  		if (!do_mono_metadata_type_equal (a->type_argv [i], b->type_argv [i], signature_only))
  			return FALSE;
  	}
  	return TRUE;
  }
  
  gboolean
  mono_metadata_generic_inst_equal (gconstpointer ka, gconstpointer kb)
  {
  	const MonoGenericInst *a = (const MonoGenericInst *) ka;
  	const MonoGenericInst *b = (const MonoGenericInst *) kb;
  
  	return mono_generic_inst_equal_full (a, b, FALSE);
  }
  
  static guint
  mono_generic_class_hash (gconstpointer data)
  {
  	const MonoGenericClass *gclass = (const MonoGenericClass *) data;
  	guint hash = mono_metadata_type_hash (&gclass->container_class->byval_arg);
  
  	hash *= 13;
  	hash += gclass->is_tb_open;
  	hash += mono_metadata_generic_context_hash (&gclass->context);
  
  	return hash;
  }
  
  static gboolean
  mono_generic_class_equal (gconstpointer ka, gconstpointer kb)
  {
  	const MonoGenericClass *a = (const MonoGenericClass *) ka;
  	const MonoGenericClass *b = (const MonoGenericClass *) kb;
  
  	return _mono_metadata_generic_class_equal (a, b, FALSE);
  }
  
  /**
   * mono_metadata_init:
   *
   * Initialize the global variables of this module.
   * This is a Mono runtime internal function.
   */
  void
  mono_metadata_init (void)
  {
  	int i;
  
  	type_cache = g_hash_table_new (mono_type_hash, mono_type_equal);
  
  	for (i = 0; i < NBUILTIN_TYPES (); ++i)
  		g_hash_table_insert (type_cache, (gpointer) &builtin_types [i], (gpointer) &builtin_types [i]);
  
  	InitializeCriticalSection (&image_sets_mutex);
  }
  
  /**
   * mono_metadata_cleanup:
   *
   * Free all resources used by this module.
   * This is a Mono runtime internal function.
   */
  void
  mono_metadata_cleanup (void)
  {
  	g_hash_table_destroy (type_cache);
  	type_cache = NULL;
  	g_ptr_array_free (image_sets, TRUE);
  	image_sets = NULL;
  	DeleteCriticalSection (&image_sets_mutex);
  }
  
  /**
   * mono_metadata_parse_type:
   * @m: metadata context
   * @mode: king of type that may be found at @ptr
   * @opt_attrs: optional attributes to store in the returned type
   * @ptr: pointer to the type representation
   * @rptr: pointer updated to match the end of the decoded stream
   * @transient: whenever to allocate the result from the heap or from a mempool
   * 
   * Decode a compressed type description found at @ptr in @m.
   * @mode can be one of MONO_PARSE_MOD_TYPE, MONO_PARSE_PARAM, MONO_PARSE_RET,
   * MONO_PARSE_FIELD, MONO_PARSE_LOCAL, MONO_PARSE_TYPE.
   * This function can be used to decode type descriptions in method signatures,
   * field signatures, locals signatures etc.
   *
   * To parse a generic type, `generic_container' points to the current class'es
   * (the `generic_container' field in the MonoClass) or the current generic method's
   * (stored in image->property_hash) generic container.
   * When we encounter any MONO_TYPE_VAR or MONO_TYPE_MVAR's, they're looked up in
   * this MonoGenericContainer.
   *
   * LOCKING: Acquires the loader lock.
   *
   * Returns: a #MonoType structure representing the decoded type.
   */
  static MonoType*
  mono_metadata_parse_type_internal (MonoImage *m, MonoGenericContainer *container, MonoParseTypeMode mode,
  								   short opt_attrs, gboolean transient, const char *ptr, const char **rptr)
  {
  	MonoType *type, *cached;
  	MonoType stype;
  	gboolean byref = FALSE;
  	gboolean pinned = FALSE;
  	const char *tmp_ptr;
  	int count = 0;
  	gboolean found;
  
  	/*
  	 * According to the spec, custom modifiers should come before the byref
  	 * flag, but the IL produced by ilasm from the following signature:
  	 *   object modopt(...) &
  	 * starts with a byref flag, followed by the modifiers. (bug #49802)
  	 * Also, this type seems to be different from 'object & modopt(...)'. Maybe
  	 * it would be better to treat byref as real type constructor instead of
  	 * a modifier...
  	 * Also, pinned should come before anything else, but some MSV++ produced
  	 * assemblies violate this (#bug 61990).
  	 */
  
  	/* Count the modifiers first */
  	tmp_ptr = ptr;
  	found = TRUE;
  	while (found) {
  		switch (*tmp_ptr) {
  		case MONO_TYPE_PINNED:
  		case MONO_TYPE_BYREF:
  			++tmp_ptr;
  			break;
  		case MONO_TYPE_CMOD_REQD:
  		case MONO_TYPE_CMOD_OPT:
  			count ++;
  			mono_metadata_parse_custom_mod (m, NULL, tmp_ptr, &tmp_ptr);
  			break;
  		default:
  			found = FALSE;
  		}
  	}
  
  	if (count) {
  		int size;
  
  		size = MONO_SIZEOF_TYPE + ((gint32)count) * sizeof (MonoCustomMod);
  		type = transient ? g_malloc0 (size) : mono_image_alloc0 (m, size);
  		type->num_mods = count;
  		if (count > 64)
  			g_warning ("got more than 64 modifiers in type");
  	} else {
  		type = &stype;
  		memset (type, 0, MONO_SIZEOF_TYPE);
  	}
  
  	/* Parse pinned, byref and custom modifiers */
  	found = TRUE;
  	count = 0;
  	while (found) {
  		switch (*ptr) {
  		case MONO_TYPE_PINNED:
  			pinned = TRUE;
  			++ptr;
  			break;
  		case MONO_TYPE_BYREF:
  			byref = TRUE;
  			++ptr;
  			break;
  		case MONO_TYPE_CMOD_REQD:
  		case MONO_TYPE_CMOD_OPT:
  			mono_metadata_parse_custom_mod (m, &(type->modifiers [count]), ptr, &ptr);
  			count ++;
  			break;
  		default:
  			found = FALSE;
  		}
  	}
  	
  	type->attrs = opt_attrs;
  	type->byref = byref;
  	type->pinned = pinned ? 1 : 0;
  
  	if (!do_mono_metadata_parse_type (type, m, container, transient, ptr, &ptr)) {
  		return NULL;
  	}
  
  	if (rptr)
  		*rptr = ptr;
  
  	if (!type->num_mods && !transient) {
  		/* no need to free type here, because it is on the stack */
  		if ((type->type == MONO_TYPE_CLASS || type->type == MONO_TYPE_VALUETYPE) && !type->pinned && !type->attrs) {
  			MonoType *ret = type->byref ? &type->data.klass->this_arg : &type->data.klass->byval_arg;
  
  			/* Consider the case:
  
  			     class Foo<T> { class Bar {} }
  			     class Test : Foo<Test>.Bar {}
  
  			   When Foo<Test> is being expanded, 'Test' isn't yet initialized.  It's actually in
  			   a really pristine state: it doesn't even know whether 'Test' is a reference or a value type.
  
  			   We ensure that the MonoClass is in a state that we can canonicalize to:
  
  			     klass->byval_arg.data.klass == klass
  			     klass->this_arg.data.klass == klass
  
  			   If we can't canonicalize 'type', it doesn't matter, since later users of 'type' will do it.
  
  			   LOCKING: even though we don't explicitly hold a lock, in the problematic case 'ret' is a field
  			            of a MonoClass which currently holds the loader lock.  'type' is local.
  			*/
  			if (ret->data.klass == type->data.klass) {
  				return ret;
  			}
  		}
  		/* No need to use locking since nobody is modifying the hash table */
  		if ((cached = g_hash_table_lookup (type_cache, type))) {
  			return cached;
  		}
  	}
  	
  	/* printf ("%x %x %c %s\n", type->attrs, type->num_mods, type->pinned ? 'p' : ' ', mono_type_full_name (type)); */
  	
  	if (type == &stype) {
  		type = transient ? g_malloc (MONO_SIZEOF_TYPE) : mono_image_alloc (m, MONO_SIZEOF_TYPE);
  		memcpy (type, &stype, MONO_SIZEOF_TYPE);
  	}
  	return type;
  }
  
  MonoType*
  mono_metadata_parse_type_full (MonoImage *m, MonoGenericContainer *container, MonoParseTypeMode mode,
  							   short opt_attrs, const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_type_internal (m, container, mode, opt_attrs, FALSE, ptr, rptr);
  }
  
  /*
   * LOCKING: Acquires the loader lock.
   */
  MonoType*
  mono_metadata_parse_type (MonoImage *m, MonoParseTypeMode mode, short opt_attrs,
  			  const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_type_full (m, NULL, mode, opt_attrs, ptr, rptr);
  }
  
  gboolean
  mono_metadata_method_has_param_attrs (MonoImage *m, int def)
  {
  	MonoTableInfo *paramt = &m->tables [MONO_TABLE_PARAM];
  	MonoTableInfo *methodt = &m->tables [MONO_TABLE_METHOD];
  	guint lastp, i, param_index = mono_metadata_decode_row_col (methodt, def - 1, MONO_METHOD_PARAMLIST);
  
  	if (def < methodt->rows)
  		lastp = mono_metadata_decode_row_col (methodt, def, MONO_METHOD_PARAMLIST);
  	else
  		lastp = m->tables [MONO_TABLE_PARAM].rows + 1;
  
  	for (i = param_index; i < lastp; ++i) {
  		guint32 flags = mono_metadata_decode_row_col (paramt, i - 1, MONO_PARAM_FLAGS);
  		if (flags)
  			return TRUE;
  	}
  
  	return FALSE;
  }
  
  /*
   * mono_metadata_get_param_attrs:
   *
   * @m The image to loader parameter attributes from
   * @def method def token (one based)
   * @param_count number of params to decode including the return value
   *
   *   Return the parameter attributes for the method whose MethodDef index is DEF. The 
   * returned memory needs to be freed by the caller. If all the param attributes are
   * 0, then NULL is returned.
   */
  int*
  mono_metadata_get_param_attrs (MonoImage *m, int def, int param_count)
  {
  	MonoTableInfo *paramt = &m->tables [MONO_TABLE_PARAM];
  	MonoTableInfo *methodt = &m->tables [MONO_TABLE_METHOD];
  	guint32 cols [MONO_PARAM_SIZE];
  	guint lastp, i, param_index = mono_metadata_decode_row_col (methodt, def - 1, MONO_METHOD_PARAMLIST);
  	int *pattrs = NULL;
  
  	if (def < methodt->rows)
  		lastp = mono_metadata_decode_row_col (methodt, def, MONO_METHOD_PARAMLIST);
  	else
  		lastp = paramt->rows + 1;
  
  	for (i = param_index; i < lastp; ++i) {
  		mono_metadata_decode_row (paramt, i - 1, cols, MONO_PARAM_SIZE);
  		if (cols [MONO_PARAM_FLAGS]) {
  			if (!pattrs)
  				pattrs = g_new0 (int, param_count);
  			/* at runtime we just ignore this kind of malformed file:
  			* the verifier can signal the error to the user
  			*/
  			if (cols [MONO_PARAM_SEQUENCE] >= param_count)
  				continue;
  			pattrs [cols [MONO_PARAM_SEQUENCE]] = cols [MONO_PARAM_FLAGS];
  		}
  	}
  
  	return pattrs;
  }
  
  /*
   * mono_metadata_parse_signature_full:
   * @image: metadata context
   * @generic_container: generic container
   * @toke: metadata token
   *
   * Decode a method signature stored in the STANDALONESIG table
   *
   * LOCKING: Assumes the loader lock is held.
   *
   * Returns: a MonoMethodSignature describing the signature.
   */
  MonoMethodSignature*
  mono_metadata_parse_signature_full (MonoImage *image, MonoGenericContainer *generic_container, guint32 token)
  {
  	MonoTableInfo *tables = image->tables;
  	guint32 idx = mono_metadata_token_index (token);
  	guint32 sig;
  	const char *ptr;
  
  	if (image->dynamic)
  		return mono_lookup_dynamic_token (image, token, NULL);
  
  	g_assert (mono_metadata_token_table(token) == MONO_TABLE_STANDALONESIG);
  		
  	sig = mono_metadata_decode_row_col (&tables [MONO_TABLE_STANDALONESIG], idx - 1, 0);
  
  	ptr = mono_metadata_blob_heap (image, sig);
  	mono_metadata_decode_blob_size (ptr, &ptr);
  
  	return mono_metadata_parse_method_signature_full (image, generic_container, 0, ptr, NULL); 
  }
  
  /*
   * mono_metadata_parse_signature:
   * @image: metadata context
   * @toke: metadata token
   *
   * Decode a method signature stored in the STANDALONESIG table
   *
   * Returns: a MonoMethodSignature describing the signature.
   */
  MonoMethodSignature*
  mono_metadata_parse_signature (MonoImage *image, guint32 token)
  {
  	return mono_metadata_parse_signature_full (image, NULL, token);
  }
  
  /*
   * mono_metadata_signature_alloc:
   * @image: metadata context
   * @nparmas: number of parameters in the signature
   *
   * Allocate a MonoMethodSignature structure with the specified number of params.
   * The return type and the params types need to be filled later.
   * This is a Mono runtime internal function.
   *
   * LOCKING: Assumes the loader lock is held.
   *
   * Returns: the new MonoMethodSignature structure.
   */
  MonoMethodSignature*
  mono_metadata_signature_alloc (MonoImage *m, guint32 nparams)
  {
  	MonoMethodSignature *sig;
  
  	sig = mono_image_alloc0 (m, MONO_SIZEOF_METHOD_SIGNATURE + ((gint32)nparams) * sizeof (MonoType*));
  	sig->param_count = nparams;
  	sig->sentinelpos = -1;
  
  	return sig;
  }
  
  static MonoMethodSignature*
  mono_metadata_signature_dup_internal (MonoImage *image, MonoMemPool *mp, MonoMethodSignature *sig)
  {
  	int sigsize;
  	MonoMethodSignature *ret;
  	sigsize = MONO_SIZEOF_METHOD_SIGNATURE + sig->param_count * sizeof (MonoType *);
  
  	if (image) {
  		ret = mono_image_alloc (image, sigsize);
  	} else if (mp) {
  		ret = mono_mempool_alloc (mp, sigsize);
  	} else {
  		ret = g_malloc (sigsize);
  	}
  	memcpy (ret, sig, sigsize);
  	return ret;
  }
  
  MonoMethodSignature*
  mono_metadata_signature_dup_full (MonoImage *image, MonoMethodSignature *sig)
  {
  	return mono_metadata_signature_dup_internal (image, NULL, sig);
  }
  
  /*The mempool is accessed without synchronization*/
  MonoMethodSignature*
  mono_metadata_signature_dup_mempool (MonoMemPool *mp, MonoMethodSignature *sig)
  {
  	return mono_metadata_signature_dup_internal (NULL, mp, sig);
  }
  
  /*
   * mono_metadata_signature_dup:
   * @sig: method signature
   *
   * Duplicate an existing MonoMethodSignature so it can be modified.
   * This is a Mono runtime internal function.
   *
   * Returns: the new MonoMethodSignature structure.
   */
  MonoMethodSignature*
  mono_metadata_signature_dup (MonoMethodSignature *sig)
  {
  	return mono_metadata_signature_dup_full (NULL, sig);
  }
  
  /*
   * mono_metadata_signature_size:
   *
   *   Return the amount of memory allocated to SIG.
   */
  guint32
  mono_metadata_signature_size (MonoMethodSignature *sig)
  {
  	return MONO_SIZEOF_METHOD_SIGNATURE + sig->param_count * sizeof (MonoType *);
  }
  
  /*
   * mono_metadata_parse_method_signature:
   * @m: metadata context
   * @generic_container: generics container
   * @def: the MethodDef index or 0 for Ref signatures.
   * @ptr: pointer to the signature metadata representation
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Decode a method signature stored at @ptr.
   * This is a Mono runtime internal function.
   *
   * LOCKING: Assumes the loader lock is held.
   *
   * Returns: a MonoMethodSignature describing the signature.
   */
  MonoMethodSignature *
  mono_metadata_parse_method_signature_full (MonoImage *m, MonoGenericContainer *container,
  					   int def, const char *ptr, const char **rptr)
  {
  	MonoMethodSignature *method;
  	int i, *pattrs = NULL;
  	guint32 hasthis = 0, explicit_this = 0, call_convention, param_count;
  	guint32 gen_param_count = 0;
  	gboolean is_open = FALSE;
  
  	if (*ptr & 0x10)
  		gen_param_count = 1;
  	if (*ptr & 0x20)
  		hasthis = 1;
  	if (*ptr & 0x40)
  		explicit_this = 1;
  	call_convention = *ptr & 0x0F;
  	ptr++;
  	if (gen_param_count)
  		gen_param_count = mono_metadata_decode_value (ptr, &ptr);
  	param_count = mono_metadata_decode_value (ptr, &ptr);
  
  	if (def)
  		pattrs = mono_metadata_get_param_attrs (m, def, param_count + 1); /*Must be + 1 since signature's param count doesn't account for the return value */
  
  	method = mono_metadata_signature_alloc (m, param_count);
  	method->hasthis = hasthis;
  	method->explicit_this = explicit_this;
  	method->call_convention = call_convention;
  	method->generic_param_count = gen_param_count;
  
  	if (call_convention != 0xa) {
  		method->ret = mono_metadata_parse_type_full (m, container, MONO_PARSE_RET, pattrs ? pattrs [0] : 0, ptr, &ptr);
  		if (!method->ret) {
  			mono_metadata_free_method_signature (method);
  			g_free (pattrs);
  			return NULL;
  		}
  		is_open = mono_class_is_open_constructed_type (method->ret);
  	}
  
  	for (i = 0; i < method->param_count; ++i) {
  		if (*ptr == MONO_TYPE_SENTINEL) {
  			if (method->call_convention != MONO_CALL_VARARG || def) {
  				g_warning ("found sentinel for methoddef or no vararg method 0x%08x on image %s", def, m->name);
  				g_free (pattrs);
  				return NULL;
  			}
  			if (method->sentinelpos >= 0) {
  				g_warning ("found sentinel twice in the same signature for method 0x%08x on image %s", def, m->name);
  				g_free (pattrs);
  				return NULL;
  			}
  			method->sentinelpos = i;
  			ptr++;
  		}
  		method->params [i] = mono_metadata_parse_type_full (m, container, MONO_PARSE_PARAM, pattrs ? pattrs [i+1] : 0, ptr, &ptr);
  		if (!method->params [i]) {
  			mono_metadata_free_method_signature (method);
  			g_free (pattrs);
  			return NULL;
  		}
  		if (!is_open)
  			is_open = mono_class_is_open_constructed_type (method->params [i]);
  	}
  
  	/* The sentinel could be missing if the caller does not pass any additional arguments */
  	if (!def && method->call_convention == MONO_CALL_VARARG && method->sentinelpos < 0)
  		method->sentinelpos = method->param_count;
  
  	method->has_type_parameters = is_open;
  
  	if (def && (method->call_convention == MONO_CALL_VARARG))
  		method->sentinelpos = method->param_count;
  
  	g_free (pattrs);
  
  	if (rptr)
  		*rptr = ptr;
  	/*
  	 * Add signature to a cache and increase ref count...
  	 */
  
  	return method;
  }
  
  /*
   * mono_metadata_parse_method_signature:
   * @m: metadata context
   * @def: the MethodDef index or 0 for Ref signatures.
   * @ptr: pointer to the signature metadata representation
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Decode a method signature stored at @ptr.
   * This is a Mono runtime internal function.
   *
   * LOCKING: Assumes the loader lock is held.
   *
   * Returns: a MonoMethodSignature describing the signature.
   */
  MonoMethodSignature *
  mono_metadata_parse_method_signature (MonoImage *m, int def, const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_method_signature_full (m, NULL, def, ptr, rptr);
  }
  
  /*
   * mono_metadata_free_method_signature:
   * @sig: signature to destroy
   *
   * Free the memory allocated in the signature @sig.
   * This method needs to be robust and work also on partially-built
   * signatures, so it does extra checks.
   */
  void
  mono_metadata_free_method_signature (MonoMethodSignature *sig)
  {
  	/* Everything is allocated from mempools */
  	/*
  	int i;
  	if (sig->ret)
  		mono_metadata_free_type (sig->ret);
  	for (i = 0; i < sig->param_count; ++i) {
  		if (sig->params [i])
  			mono_metadata_free_type (sig->params [i]);
  	}
  	*/
  }
  
  void
  mono_metadata_free_inflated_signature (MonoMethodSignature *sig)
  {
  	int i;
  
  	/* Allocated in inflate_generic_signature () */
  	if (sig->ret)
  		mono_metadata_free_type (sig->ret);
  	for (i = 0; i < sig->param_count; ++i) {
  		if (sig->params [i])
  			mono_metadata_free_type (sig->params [i]);
  	}
  	g_free (sig);
  }
  
  static gboolean
  inflated_method_equal (gconstpointer a, gconstpointer b)
  {
  	const MonoMethodInflated *ma = a;
  	const MonoMethodInflated *mb = b;
  	if (ma->declaring != mb->declaring)
  		return FALSE;
  	if (ma->method.method.is_mb_open != mb->method.method.is_mb_open)
  		return FALSE;
  	return mono_metadata_generic_context_equal (&ma->context, &mb->context);
  }
  
  static guint
  inflated_method_hash (gconstpointer a)
  {
  	const MonoMethodInflated *ma = a;
  	return (mono_metadata_generic_context_hash (&ma->context) ^ mono_aligned_addr_hash (ma->declaring)) + ma->method.method.is_mb_open;
  }
  
  static gboolean
  inflated_signature_equal (gconstpointer a, gconstpointer b)
  {
  	const MonoInflatedMethodSignature *sig1 = a;
  	const MonoInflatedMethodSignature *sig2 = b;
  
  	/* sig->sig is assumed to be canonized */
  	if (sig1->sig != sig2->sig)
  		return FALSE;
  	/* The generic instances are canonized */
  	return mono_metadata_generic_context_equal (&sig1->context, &sig2->context);
  }
  
  static guint
  inflated_signature_hash (gconstpointer a)
  {
  	const MonoInflatedMethodSignature *sig = a;
  
  	/* sig->sig is assumed to be canonized */
  	return mono_metadata_generic_context_hash (&sig->context) ^ mono_aligned_addr_hash (sig->sig);
  }
  
  /*static void
  dump_ginst (MonoGenericInst *ginst)
  {
  	int i;
  	char *name;
  
  	g_print ("Ginst: <");
  	for (i = 0; i < ginst->type_argc; ++i) {
  		if (i != 0)
  			g_print (", ");
  		name = mono_type_get_name (ginst->type_argv [i]);
  		g_print ("%s", name);
  		g_free (name);
  	}
  	g_print (">");
  }*/
  
  static gboolean type_in_image (MonoType *type, MonoImage *image);
  
  static gboolean
  signature_in_image (MonoMethodSignature *sig, MonoImage *image)
  {
  	gpointer iter = NULL;
  	MonoType *p;
  
  	while ((p = mono_signature_get_params (sig, &iter)) != NULL)
  		if (type_in_image (p, image))
  			return TRUE;
  
  	return type_in_image (mono_signature_get_return_type (sig), image);
  }
  
  static gboolean
  ginst_in_image (MonoGenericInst *ginst, MonoImage *image)
  {
  	int i;
  
  	for (i = 0; i < ginst->type_argc; ++i) {
  		if (type_in_image (ginst->type_argv [i], image))
  			return TRUE;
  	}
  
  	return FALSE;
  }
  
  static gboolean
  gclass_in_image (MonoGenericClass *gclass, MonoImage *image)
  {
  	return gclass->container_class->image == image ||
  		ginst_in_image (gclass->context.class_inst, image);
  }
  
  static gboolean
  type_in_image (MonoType *type, MonoImage *image)
  {
  retry:
  	switch (type->type) {
  	case MONO_TYPE_GENERICINST:
  		return gclass_in_image (type->data.generic_class, image);
  	case MONO_TYPE_PTR:
  		type = type->data.type;
  		goto retry;
  	case MONO_TYPE_SZARRAY:
  		type = &type->data.klass->byval_arg;
  		goto retry;
  	case MONO_TYPE_ARRAY:
  		type = &type->data.array->eklass->byval_arg;
  		goto retry;
  	case MONO_TYPE_FNPTR:
  		return signature_in_image (type->data.method, image);
  	case MONO_TYPE_VAR: {
  		MonoGenericContainer *container = mono_type_get_generic_param_owner (type);
  		if (container) {
  			g_assert (!container->is_method);
  			/*
  			 * FIXME: The following check is here solely
  			 * for monodis, which uses the internal
  			 * function
  			 * mono_metadata_load_generic_params().  The
  			 * caller of that function needs to fill in
  			 * owner->klass or owner->method of the
  			 * returned struct, but monodis doesn't do
  			 * that.  The image unloading depends on that,
  			 * however, so a crash results without this
  			 * check.
  			 */
  			if (!container->owner.klass)
  				return container->image == image;
  			return container->owner.klass->image == image;
  		} else {
  			return type->data.generic_param->image == image;
  		}
  	}
  	case MONO_TYPE_MVAR: {
  		MonoGenericContainer *container = mono_type_get_generic_param_owner (type);
  		if (type->data.generic_param->image == image)
  			return TRUE;
  		if (container) {
  			g_assert (container->is_method);
  			if (!container->owner.method)
  				/* RefEmit created generic param whose method is not finished */
  				return container->image == image;
  			return container->owner.method->klass->image == image;
  		} else {
  			return type->data.generic_param->image == image;
  		}
  	}
  	default:
  		/* At this point, we should've avoided all potential allocations in mono_class_from_mono_type () */
  		return image == mono_class_from_mono_type (type)->image;
  	}
  }
  
  static inline void
  image_sets_lock (void)
  {
  	EnterCriticalSection (&image_sets_mutex);
  }
  
  static inline void
  image_sets_unlock (void)
  {
  	LeaveCriticalSection (&image_sets_mutex);
  }
  
  /*
   * get_image_set:
   *
   *   Return a MonoImageSet representing the set of images in IMAGES.
   */
  static MonoImageSet*
  get_image_set (MonoImage **images, int nimages)
  {
  	int i, j, k;
  	MonoImageSet *set;
  	GSList *l;
  
  	/* Common case */
  	if (nimages == 1 && images [0] == mono_defaults.corlib && mscorlib_image_set)
  		return mscorlib_image_set;
  
  	/* Happens with empty generic instances */
  	if (nimages == 0)
  		return mscorlib_image_set;
  
  	image_sets_lock ();
  
  	if (!image_sets)
  		image_sets = g_ptr_array_new ();
  
  	if (images [0] == mono_defaults.corlib && nimages > 1)
  		l = images [1]->image_sets;
  	else
  		l = images [0]->image_sets;
  
  	set = NULL;
  	for (; l; l = l->next) {
  		set = l->data;
  
  		if (set->nimages == nimages) {
  			for (j = 0; j < nimages; ++j) {
  				for (k = 0; k < nimages; ++k)
  					if (set->images [k] == images [j])
  						break;
  				if (k == nimages)
  					/* Not found */
  					break;
  			}
  			if (j == nimages)
  				/* Found */
  				break;
  		}
  	}
  
  	if (!l) {
  		/* Not found */
  		set = g_new0 (MonoImageSet, 1);
  		set->nimages = nimages;
  		set->images = g_new0 (MonoImage*, nimages);
  		InitializeCriticalSection (&set->lock);
  		for (i = 0; i < nimages; ++i)
  			set->images [i] = images [i];
  		set->gclass_cache = g_hash_table_new_full (mono_generic_class_hash, mono_generic_class_equal, NULL, (GDestroyNotify)free_generic_class);
  		set->ginst_cache = g_hash_table_new_full (mono_metadata_generic_inst_hash, mono_metadata_generic_inst_equal, NULL, (GDestroyNotify)free_generic_inst);
  		set->gmethod_cache = g_hash_table_new_full (inflated_method_hash, inflated_method_equal, NULL, (GDestroyNotify)free_inflated_method);
  		set->gsignature_cache = g_hash_table_new_full (inflated_signature_hash, inflated_signature_equal, NULL, (GDestroyNotify)free_inflated_signature);
  	
  		for (i = 0; i < nimages; ++i)
  			set->images [i]->image_sets = g_slist_prepend (set->images [i]->image_sets, set);
  
  		g_ptr_array_add (image_sets, set);
  	}
  
  	if (nimages == 1 && images [0] == mono_defaults.corlib) {
  		mono_memory_barrier ();
  		mscorlib_image_set = set;
  	}
  
  	image_sets_unlock ();
  
  	return set;
  }
  
  static void
  delete_image_set (MonoImageSet *set)
  {
  	int i;
  
  	g_hash_table_destroy (set->gclass_cache);
  	g_hash_table_destroy (set->ginst_cache);
  	g_hash_table_destroy (set->gmethod_cache);
  	g_hash_table_destroy (set->gsignature_cache);
  
  	image_sets_lock ();
  
  	for (i = 0; i < set->nimages; ++i)
  		set->images [i]->image_sets = g_slist_remove (set->images [i]->image_sets, set);
  
  	g_ptr_array_remove (image_sets, set);
  
  	image_sets_unlock ();
  
  	if (set->mempool)
  		mono_mempool_destroy (set->mempool);
  	g_free (set->images);
  	DeleteCriticalSection (&set->lock);
  	g_free (set);
  }
  
  static void
  mono_image_set_lock (MonoImageSet *set)
  {
  	EnterCriticalSection (&set->lock);
  }
  
  static void
  mono_image_set_unlock (MonoImageSet *set)
  {
  	LeaveCriticalSection (&set->lock);
  }
  
  gpointer
  mono_image_set_alloc (MonoImageSet *set, guint size)
  {
  	gpointer res;
  
  	mono_image_set_lock (set);
  	if (!set->mempool)
  		set->mempool = mono_mempool_new_size (1024);
  	res = mono_mempool_alloc (set->mempool, size);
  	mono_image_set_unlock (set);
  
  	return res;
  }
  
  gpointer
  mono_image_set_alloc0 (MonoImageSet *set, guint size)
  {
  	gpointer res;
  
  	mono_image_set_lock (set);
  	if (!set->mempool)
  		set->mempool = mono_mempool_new_size (1024);
  	res = mono_mempool_alloc0 (set->mempool, size);
  	mono_image_set_unlock (set);
  
  	return res;
  }
  
  char*
  mono_image_set_strdup (MonoImageSet *set, const char *s)
  {
  	char *res;
  
  	mono_image_set_lock (set);
  	if (!set->mempool)
  		set->mempool = mono_mempool_new_size (1024);
  	res = mono_mempool_strdup (set->mempool, s);
  	mono_image_set_unlock (set);
  
  	return res;
  }
  
  /* 
   * Structure used by the collect_..._images functions to store the image list.
   */
  typedef struct {
  	MonoImage *image_buf [64];
  	MonoImage **images;
  	int nimages, images_len;
  } CollectData;
  
  static void
  collect_data_init (CollectData *data)
  {
  	data->images = data->image_buf;
  	data->images_len = 64;
  	data->nimages = 0;
  }
  
  static void
  collect_data_free (CollectData *data)
  {
  	if (data->images != data->image_buf)
  		g_free (data->images);
  }
  
  static void
  enlarge_data (CollectData *data)
  {
  	int new_len = data->images_len < 16 ? 16 : data->images_len * 2;
  	MonoImage **d = g_new (MonoImage *, new_len);
  
  	// FIXME: test this
  	g_assert_not_reached ();
  	memcpy (d, data->images, data->images_len);
  	if (data->images != data->image_buf)
  		g_free (data->images);
  	data->images = d;
  	data->images_len = new_len;
  }
  
  static inline void
  add_image (MonoImage *image, CollectData *data)
  {
  	int i;
  
  	/* The arrays are small, so use a linear search instead of a hash table */
  	for (i = 0; i < data->nimages; ++i)
  		if (data->images [i] == image)
  			return;
  
  	if (data->nimages == data->images_len)
  		enlarge_data (data);
  
  	data->images [data->nimages ++] = image;
  }
  
  static void
  collect_type_images (MonoType *type, CollectData *data);
  
  static void
  collect_ginst_images (MonoGenericInst *ginst, CollectData *data)
  {
  	int i;
  
  	for (i = 0; i < ginst->type_argc; ++i) {
  		collect_type_images (ginst->type_argv [i], data);
  	}
  }
  
  static void
  collect_gclass_images (MonoGenericClass *gclass, CollectData *data)
  {
  	add_image (gclass->container_class->image, data);
  	if (gclass->context.class_inst)
  		collect_ginst_images (gclass->context.class_inst, data);
  }
  
  static void
  collect_signature_images (MonoMethodSignature *sig, CollectData *data)
  {
  	gpointer iter = NULL;
  	MonoType *p;
  
  	collect_type_images (mono_signature_get_return_type (sig), data);
  	while ((p = mono_signature_get_params (sig, &iter)) != NULL)
  		collect_type_images (p, data);
  }
  
  static void
  collect_inflated_signature_images (MonoInflatedMethodSignature *sig, CollectData *data)
  {
  	collect_signature_images (sig->sig, data);
  	if (sig->context.class_inst)
  		collect_ginst_images (sig->context.class_inst, data);
  	if (sig->context.method_inst)
  		collect_ginst_images (sig->context.method_inst, data);
  }
  
  static void
  collect_method_images (MonoMethodInflated *method, CollectData *data)
  {
  	MonoMethod *m = method->declaring;
  
  	add_image (method->declaring->klass->image, data);
  	if (method->context.class_inst)
  		collect_ginst_images (method->context.class_inst, data);
  	if (method->context.method_inst)
  		collect_ginst_images (method->context.method_inst, data);
  	/*
  	 * Dynamic assemblies have no references, so the images they depend on can be unloaded before them.
  	 */
  	if (m->klass->image->dynamic)
  		collect_signature_images (mono_method_signature (m), data);
  }
  
  static void
  collect_type_images (MonoType *type, CollectData *data)
  {
  retry:
  	switch (type->type) {
  	case MONO_TYPE_GENERICINST:
  		collect_gclass_images (type->data.generic_class, data);
  		break;
  	case MONO_TYPE_PTR:
  		type = type->data.type;
  		goto retry;
  	case MONO_TYPE_SZARRAY:
  		type = &type->data.klass->byval_arg;
  		goto retry;
  	case MONO_TYPE_ARRAY:
  		type = &type->data.array->eklass->byval_arg;
  		goto retry;
  	case MONO_TYPE_FNPTR:
  		//return signature_in_image (type->data.method, image);
  		g_assert_not_reached ();
  	case MONO_TYPE_VAR: {
  		MonoGenericContainer *container = mono_type_get_generic_param_owner (type);
  		if (container) {
  			g_assert (!container->is_method);
  			/*
  			 * FIXME: The following check is here solely
  			 * for monodis, which uses the internal
  			 * function
  			 * mono_metadata_load_generic_params().  The
  			 * caller of that function needs to fill in
  			 * owner->klass or owner->method of the
  			 * returned struct, but monodis doesn't do
  			 * that.  The image unloading depends on that,
  			 * however, so a crash results without this
  			 * check.
  			 */
  			if (!container->owner.klass)
  				add_image (container->image, data);
  			else
  				add_image (container->owner.klass->image, data);
  		} else {
  			add_image (type->data.generic_param->image, data);
  		}
  	}
  		break;
  	case MONO_TYPE_MVAR: {
  		MonoGenericContainer *container = mono_type_get_generic_param_owner (type);
  		if (type->data.generic_param->image)
  			add_image (type->data.generic_param->image, data);
  		if (container) {
  			if (!container->owner.method) {
  				/* RefEmit created generic param whose method is not finished */
  				add_image (container->image, data);
  			} else {
  				g_assert (container->is_method);
  				add_image (container->owner.method->klass->image, data);
  			}
  		} else {
  			add_image (type->data.generic_param->image, data);
  		}
  	}
  		break;
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_VALUETYPE:
  		add_image (mono_class_from_mono_type (type)->image, data);
  		break;
  	default:
  		add_image (mono_defaults.corlib, data);
  	}
  }
  
  typedef struct {
  	MonoImage *image;
  	GSList *list;
  } CleanForImageUserData;
  
  static gboolean
  steal_gclass_in_image (gpointer key, gpointer value, gpointer data)
  {
  	MonoGenericClass *gclass = key;
  	CleanForImageUserData *user_data = data;
  
  	g_assert (gclass_in_image (gclass, user_data->image));
  
  	user_data->list = g_slist_prepend (user_data->list, gclass);
  	return TRUE;
  }
  
  static gboolean
  steal_ginst_in_image (gpointer key, gpointer value, gpointer data)
  {
  	MonoGenericInst *ginst = key;
  	CleanForImageUserData *user_data = data;
  
  	// This doesn't work during corlib compilation
  	//g_assert (ginst_in_image (ginst, user_data->image));
  
  	user_data->list = g_slist_prepend (user_data->list, ginst);
  	return TRUE;
  }
  
  static gboolean
  inflated_method_in_image (gpointer key, gpointer value, gpointer data)
  {
  	MonoImage *image = data;
  	MonoMethodInflated *method = key;
  
  	// FIXME:
  	// https://bugzilla.novell.com/show_bug.cgi?id=458168
  	g_assert (method->declaring->klass->image == image ||
  		(method->context.class_inst && ginst_in_image (method->context.class_inst, image)) ||
  			  (method->context.method_inst && ginst_in_image (method->context.method_inst, image)) || (((MonoMethod*)method)->signature && signature_in_image (mono_method_signature ((MonoMethod*)method), image)));
  
  	return TRUE;
  }
  
  static gboolean
  inflated_signature_in_image (gpointer key, gpointer value, gpointer data)
  {
  	MonoImage *image = data;
  	MonoInflatedMethodSignature *sig = key;
  
  	return signature_in_image (sig->sig, image) ||
  		(sig->context.class_inst && ginst_in_image (sig->context.class_inst, image)) ||
  		(sig->context.method_inst && ginst_in_image (sig->context.method_inst, image));
  }	
  
  static void
  check_gmethod (gpointer key, gpointer value, gpointer data)
  {
  	MonoMethodInflated *method = key;
  	MonoImage *image = data;
  
  	if (method->context.class_inst)
  		g_assert (!ginst_in_image (method->context.class_inst, image));
  	if (method->context.method_inst)
  		g_assert (!ginst_in_image (method->context.method_inst, image));
  	if (((MonoMethod*)method)->signature)
  		g_assert (!signature_in_image (mono_method_signature ((MonoMethod*)method), image));
  }
  
  /*
   * check_image_sets:
   *
   *   Run a consistency check on the image set data structures.
   */
  static G_GNUC_UNUSED void
  check_image_sets (MonoImage *image)
  {
  	int i;
  	GSList *l = image->image_sets;
  
  	if (!image_sets)
  		return;
  
  	for (i = 0; i < image_sets->len; ++i) {
  		MonoImageSet *set = g_ptr_array_index (image_sets, i);
  
  		if (!g_slist_find (l, set)) {
  			g_hash_table_foreach (set->gmethod_cache, check_gmethod, image);
  		}
  	}
  }
  
  void
  mono_metadata_clean_for_image (MonoImage *image)
  {
  	CleanForImageUserData ginst_data, gclass_data;
  	GSList *l, *set_list;
  
  	//check_image_sets (image);
  
  	/*
  	 * The data structures could reference each other so we delete them in two phases.
  	 * This is required because of the hashing functions in gclass/ginst_cache.
  	 */
  	ginst_data.image = gclass_data.image = image;
  	ginst_data.list = gclass_data.list = NULL;
  	mono_loader_lock ();
  
  	/* Collect the items to delete */
  	/* delete_image_set () modifies the lists so make a copy */
  	for (l = image->image_sets; l; l = l->next) {
  		MonoImageSet *set = l->data;
  
  		mono_image_set_lock (set);
  		g_hash_table_foreach_steal (set->gclass_cache, steal_gclass_in_image, &gclass_data);
  		g_hash_table_foreach_steal (set->ginst_cache, steal_ginst_in_image, &ginst_data);
  		g_hash_table_foreach_remove (set->gmethod_cache, inflated_method_in_image, image);
  		g_hash_table_foreach_remove (set->gsignature_cache, inflated_signature_in_image, image);
  		mono_image_set_unlock (set);
  	}
  
  	/* Delete the removed items */
  	for (l = ginst_data.list; l; l = l->next)
  		free_generic_inst (l->data);
  	for (l = gclass_data.list; l; l = l->next)
  		free_generic_class (l->data);
  	g_slist_free (ginst_data.list);
  	g_slist_free (gclass_data.list);
  	/* delete_image_set () modifies the lists so make a copy */
  	set_list = g_slist_copy (image->image_sets);
  	for (l = set_list; l; l = l->next) {
  		MonoImageSet *set = l->data;
  
  		delete_image_set (set);
  	}
  	g_slist_free (set_list);
  
  	mono_loader_unlock ();
  }
  
  static void
  free_inflated_method (MonoMethodInflated *imethod)
  {
  	int i;
  	MonoMethod *method = (MonoMethod*)imethod;
  
  	mono_marshal_free_inflated_wrappers (method);
  
  	if (method->signature)
  		mono_metadata_free_inflated_signature (method->signature);
  
  	if (!((method->flags & METHOD_ATTRIBUTE_ABSTRACT) || (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) || (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) || (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))) {
  		MonoMethodHeader *header = imethod->header;
  
  		if (header) {
  			/* Allocated in inflate_generic_header () */
  			for (i = 0; i < header->num_locals; ++i)
  				mono_metadata_free_type (header->locals [i]);
  			g_free (header->clauses);
  			g_free (header);
  		}
  	}
  
  	g_free (method);
  }
  
  static void
  free_generic_inst (MonoGenericInst *ginst)
  {
  	int i;
  
  	/* The ginst itself is allocated from the image set mempool */
  	for (i = 0; i < ginst->type_argc; ++i)
  		mono_metadata_free_type (ginst->type_argv [i]);
  }
  
  static void
  free_generic_class (MonoGenericClass *gclass)
  {
  	/* The gclass itself is allocated from the image set mempool */
  	if (gclass->is_dynamic)
  		mono_reflection_free_dynamic_generic_class (gclass);
  	if (gclass->cached_class && gclass->cached_class->interface_id)
  		mono_unload_interface_id (gclass->cached_class);
  }
  
  static void
  free_inflated_signature (MonoInflatedMethodSignature *sig)
  {
  	mono_metadata_free_inflated_signature (sig->sig);
  	g_free (sig);
  }
  
  /*
   * LOCKING: assumes the loader lock is held.
   */
  MonoMethodInflated*
  mono_method_inflated_lookup (MonoMethodInflated* method, gboolean cache)
  {
  	CollectData data;
  	MonoImageSet *set;
  	gpointer res;
  
  	collect_data_init (&data);
  
  	collect_method_images (method, &data);
  
  	set = get_image_set (data.images, data.nimages);
  
  	collect_data_free (&data);
  
  	if (cache) {
  		mono_image_set_lock (set);
  		g_hash_table_insert (set->gmethod_cache, method, method);
  		mono_image_set_unlock (set);
  
  		return method;
  	} else {
  		mono_image_set_lock (set);
  		res = g_hash_table_lookup (set->gmethod_cache, method);
  		mono_image_set_unlock (set);
  
  		return res;
  	}
  }
  
  /*
   * mono_metadata_get_inflated_signature:
   *
   *   Given an inflated signature and a generic context, return a canonical copy of the 
   * signature. The returned signature might be equal to SIG or it might be a cached copy.
   */
  MonoMethodSignature *
  mono_metadata_get_inflated_signature (MonoMethodSignature *sig, MonoGenericContext *context)
  {
  	MonoInflatedMethodSignature helper;
  	MonoInflatedMethodSignature *res;
  	CollectData data;
  	MonoImageSet *set;
  
  	helper.sig = sig;
  	helper.context.class_inst = context->class_inst;
  	helper.context.method_inst = context->method_inst;
  
  	collect_data_init (&data);
  
  	collect_inflated_signature_images (&helper, &data);
  
  	set = get_image_set (data.images, data.nimages);
  
  	collect_data_free (&data);
  
  	mono_image_set_lock (set);
  
  	res = g_hash_table_lookup (set->gsignature_cache, &helper);
  	if (!res) {
  		res = g_new0 (MonoInflatedMethodSignature, 1);
  		res->sig = sig;
  		res->context.class_inst = context->class_inst;
  		res->context.method_inst = context->method_inst;
  		g_hash_table_insert (set->gsignature_cache, res, res);
  	}
  
  	mono_image_set_unlock (set);
  
  	return res->sig;
  }
  
  /*
   * mono_metadata_get_generic_inst:
   *
   * Given a list of types, return a MonoGenericInst that represents that list.
   * The returned MonoGenericInst has its own copy of the list of types.  The list
   * passed in the argument can be freed, modified or disposed of.
   *
   */
  MonoGenericInst *
  mono_metadata_get_generic_inst (int type_argc, MonoType **type_argv)
  {
  	MonoGenericInst *ginst;
  	gboolean is_open;
  	int i;
  	int size = MONO_SIZEOF_GENERIC_INST + type_argc * sizeof (MonoType *);
  	CollectData data;
  	MonoImageSet *set;
  
  	for (i = 0; i < type_argc; ++i)
  		if (mono_class_is_open_constructed_type (type_argv [i]))
  			break;
  	is_open = (i < type_argc);
  
  	ginst = g_alloca (size);
  	memset (ginst, 0, sizeof (MonoGenericInst));
  	ginst->is_open = is_open;
  	ginst->type_argc = type_argc;
  	memcpy (ginst->type_argv, type_argv, type_argc * sizeof (MonoType *));
  
  	collect_data_init (&data);
  
  	collect_ginst_images (ginst, &data);
  
  	set = get_image_set (data.images, data.nimages);
  
  	collect_data_free (&data);
  
  	mono_image_set_lock (set);
  
  	ginst = g_hash_table_lookup (set->ginst_cache, ginst);
  	if (!ginst) {
  		ginst = mono_image_set_alloc0 (set, size);
  #ifndef MONO_SMALL_CONFIG
  		ginst->id = ++next_generic_inst_id;
  #endif
  		ginst->is_open = is_open;
  		ginst->type_argc = type_argc;
  
  		for (i = 0; i < type_argc; ++i)
  			ginst->type_argv [i] = mono_metadata_type_dup (NULL, type_argv [i]);
  
  		g_hash_table_insert (set->ginst_cache, ginst, ginst);
  	}
  
  	mono_image_set_unlock (set);
  	return ginst;
  }
  
  static gboolean
  mono_metadata_is_type_builder_generic_type_definition (MonoClass *container_class, MonoGenericInst *inst, gboolean is_dynamic)
  {
  	MonoGenericContainer *container = container_class->generic_container; 
  
  	if (!is_dynamic || container_class->wastypebuilder || container->type_argc != inst->type_argc)
  		return FALSE;
  	return inst == container->context.class_inst;
  }
  
  /*
   * mono_metadata_lookup_generic_class:
   *
   * Returns a MonoGenericClass with the given properties.
   *
   */
  MonoGenericClass *
  mono_metadata_lookup_generic_class (MonoClass *container_class, MonoGenericInst *inst, gboolean is_dynamic)
  {
  	MonoGenericClass *gclass;
  	MonoGenericClass helper;
  	gboolean is_tb_open = mono_metadata_is_type_builder_generic_type_definition (container_class, inst, is_dynamic);
  	MonoImageSet *set;
  	CollectData data;
  
  	helper.container_class = container_class;
  	helper.context.class_inst = inst;
  	helper.context.method_inst = NULL;
  	helper.is_dynamic = is_dynamic; /* We use this in a hash lookup, which does not attempt to downcast the pointer */
  	helper.is_tb_open = is_tb_open;
  	helper.cached_class = NULL;
  
  	collect_data_init (&data);
  
  	collect_gclass_images (&helper, &data);
  
  	set = get_image_set (data.images, data.nimages);
  
  	collect_data_free (&data);
  
  	mono_image_set_lock (set);
  
  	gclass = g_hash_table_lookup (set->gclass_cache, &helper);
  
  	/* A tripwire just to keep us honest */
  	g_assert (!helper.cached_class);
  
  	if (gclass) {
  		mono_image_set_unlock (set);
  		return gclass;
  	}
  
  	if (is_dynamic) {
  		MonoDynamicGenericClass *dgclass = mono_image_set_new0 (set, MonoDynamicGenericClass, 1);
  		gclass = &dgclass->generic_class;
  		gclass->is_dynamic = 1;
  	} else {
  		gclass = mono_image_set_new0 (set, MonoGenericClass, 1);
  	}
  
  	gclass->is_tb_open = is_tb_open;
  	gclass->container_class = container_class;
  	gclass->context.class_inst = inst;
  	gclass->context.method_inst = NULL;
  	gclass->owner = set;
  	if (inst == container_class->generic_container->context.class_inst && !is_tb_open)
  		gclass->cached_class = container_class;
  
  	g_hash_table_insert (set->gclass_cache, gclass, gclass);
  
  	mono_image_set_unlock (set);
  
  	return gclass;
  }
  
  /*
   * mono_metadata_inflate_generic_inst:
   *
   * Instantiate the generic instance @ginst with the context @context.
   * Check @error for success.
   *
   */
  MonoGenericInst *
  mono_metadata_inflate_generic_inst (MonoGenericInst *ginst, MonoGenericContext *context, MonoError *error)
  {
  	MonoType **type_argv;
  	MonoGenericInst *nginst = NULL;
  	int i, count = 0;
  
  	mono_error_init (error);
  
  	if (!ginst->is_open)
  		return ginst;
  
  	type_argv = g_new0 (MonoType*, ginst->type_argc);
  
  	for (i = 0; i < ginst->type_argc; i++) {
  		type_argv [i] = mono_class_inflate_generic_type_checked (ginst->type_argv [i], context, error);
  		if (!mono_error_ok (error))
  			goto cleanup;
  		++count;
  	}
  
  	nginst = mono_metadata_get_generic_inst (ginst->type_argc, type_argv);
  
  cleanup:
  	for (i = 0; i < count; i++)
  		mono_metadata_free_type (type_argv [i]);
  	g_free (type_argv);
  
  	return nginst;
  }
  
  MonoGenericInst *
  mono_metadata_parse_generic_inst (MonoImage *m, MonoGenericContainer *container,
  				  int count, const char *ptr, const char **rptr)
  {
  	MonoType **type_argv;
  	MonoGenericInst *ginst;
  	int i;
  
  	type_argv = g_new0 (MonoType*, count);
  
  	for (i = 0; i < count; i++) {
  		MonoType *t = mono_metadata_parse_type_full (m, container, MONO_PARSE_TYPE, 0, ptr, &ptr);
  		if (!t) {
  			g_free (type_argv);
  			return NULL;
  		}
  		type_argv [i] = t;
  	}
  
  	if (rptr)
  		*rptr = ptr;
  
  	ginst = mono_metadata_get_generic_inst (count, type_argv);
  
  	g_free (type_argv);
  
  	return ginst;
  }
  
  static gboolean
  do_mono_metadata_parse_generic_class (MonoType *type, MonoImage *m, MonoGenericContainer *container,
  				      const char *ptr, const char **rptr)
  {
  	MonoGenericInst *inst;
  	MonoClass *gklass;
  	MonoType *gtype;
  	int count;
  
  	gtype = mono_metadata_parse_type (m, MONO_PARSE_TYPE, 0, ptr, &ptr);
  	if (gtype == NULL)
  		return FALSE;
  
  	gklass = mono_class_from_mono_type (gtype);
  	if (!gklass->generic_container)
  		return FALSE;
  
  	count = mono_metadata_decode_value (ptr, &ptr);
  	inst = mono_metadata_parse_generic_inst (m, container, count, ptr, &ptr);
  	if (inst == NULL)
  		return FALSE;
  
  	if (rptr)
  		*rptr = ptr;
  
  	type->data.generic_class = mono_metadata_lookup_generic_class (gklass, inst, FALSE);
  	return TRUE;
  }
  
  /*
   * select_container:
   * @gc: The generic container to normalize
   * @type: The kind of generic parameters the resulting generic-container should contain
   */
  
  static MonoGenericContainer *
  select_container (MonoGenericContainer *gc, MonoTypeEnum type)
  {
  	gboolean is_var = (type == MONO_TYPE_VAR);
  	if (!gc)
  		return NULL;
  
  	g_assert (is_var || type == MONO_TYPE_MVAR);
  
  	if (is_var) {
  		if (gc->is_method || gc->parent)
  			/*
  			 * The current MonoGenericContainer is a generic method -> its `parent'
  			 * points to the containing class'es container.
  			 */
  			return gc->parent;
  	}
  
  	return gc;
  }
  
  /* 
   * mono_metadata_parse_generic_param:
   * @generic_container: Our MonoClass's or MonoMethod's MonoGenericContainer;
   *                     see mono_metadata_parse_type_full() for details.
   * Internal routine to parse a generic type parameter.
   * LOCKING: Acquires the loader lock
   */
  static MonoGenericParam *
  mono_metadata_parse_generic_param (MonoImage *m, MonoGenericContainer *generic_container,
  				   MonoTypeEnum type, const char *ptr, const char **rptr)
  {
  	int index = mono_metadata_decode_value (ptr, &ptr);
  	if (rptr)
  		*rptr = ptr;
  
  	generic_container = select_container (generic_container, type);
  	if (!generic_container) {
  		/* Create dummy MonoGenericParam */
  		MonoGenericParam *param;
  
  		param = mono_image_alloc0 (m, sizeof (MonoGenericParam));
  		param->num = index;
  		param->image = m;
  
  		return param;
  	}
  
  	if (index >= generic_container->type_argc)
  		return NULL;
  
  	return mono_generic_container_get_param (generic_container, index);
  }
  
  /*
   * mono_metadata_get_shared_type:
   *
   *   Return a shared instance of TYPE, if available, NULL otherwise.
   * Shared MonoType instances help save memory. Their contents should not be modified
   * by the caller. They do not need to be freed as their lifetime is bound by either
   * the lifetime of the runtime (builtin types), or the lifetime of the MonoClass
   * instance they are embedded in. If they are freed, they should be freed using
   * mono_metadata_free_type () instead of g_free ().
   */
  MonoType*
  mono_metadata_get_shared_type (MonoType *type)
  {
  	MonoType *cached;
  
  	/* No need to use locking since nobody is modifying the hash table */
  	if ((cached = g_hash_table_lookup (type_cache, type)))
  		return cached;
  
  	switch (type->type){
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_VALUETYPE:
  		if (type == &type->data.klass->byval_arg)
  			return type;
  		if (type == &type->data.klass->this_arg)
  			return type;
  		break;
  	}
  
  	return NULL;
  }
  
  static gboolean
  compare_type_literals (int class_type, int type_type)
  {
  	/* byval_arg.type can be zero if we're decoding a type that references a class been loading.
  	 * See mcs/test/gtest-440. and #650936.
  	 * FIXME This better be moved to the metadata verifier as it can catch more cases.
  	 */
  	if (!class_type)
  		return TRUE;
  	/* NET 1.1 assemblies might encode string and object in a denormalized way.
  	 * See #675464.
  	 */
  	if (type_type == MONO_TYPE_CLASS && (class_type == MONO_TYPE_STRING || class_type == MONO_TYPE_OBJECT))
  		return TRUE;
  	return class_type == type_type;
  }
  
  /* 
   * do_mono_metadata_parse_type:
   * @type: MonoType to be filled in with the return value
   * @m: image context
   * @generic_context: generics_context
   * @transient: whenever to allocate data from the heap
   * @ptr: pointer to the encoded type
   * @rptr: pointer where the end of the encoded type is saved
   * 
   * Internal routine used to "fill" the contents of @type from an 
   * allocated pointer.  This is done this way to avoid doing too
   * many mini-allocations (particularly for the MonoFieldType which
   * most of the time is just a MonoType, but sometimes might be augmented).
   *
   * This routine is used by mono_metadata_parse_type and
   * mono_metadata_parse_field_type
   *
   * This extracts a Type as specified in Partition II (22.2.12) 
   *
   * Returns: FALSE if the type could not be loaded
   */
  static gboolean
  do_mono_metadata_parse_type (MonoType *type, MonoImage *m, MonoGenericContainer *container,
  							 gboolean transient, const char *ptr, const char **rptr)
  {
  	gboolean ok = TRUE;
  	type->type = mono_metadata_decode_value (ptr, &ptr);
  	
  	switch (type->type){
  	case MONO_TYPE_VOID:
  	case MONO_TYPE_BOOLEAN:
  	case MONO_TYPE_CHAR:
  	case MONO_TYPE_I1:
  	case MONO_TYPE_U1:
  	case MONO_TYPE_I2:
  	case MONO_TYPE_U2:
  	case MONO_TYPE_I4:
  	case MONO_TYPE_U4:
  	case MONO_TYPE_I8:
  	case MONO_TYPE_U8:
  	case MONO_TYPE_R4:
  	case MONO_TYPE_R8:
  	case MONO_TYPE_I:
  	case MONO_TYPE_U:
  	case MONO_TYPE_STRING:
  	case MONO_TYPE_OBJECT:
  	case MONO_TYPE_TYPEDBYREF:
  		break;
  	case MONO_TYPE_VALUETYPE:
  	case MONO_TYPE_CLASS: {
  		guint32 token;
  		MonoClass *class;
  		token = mono_metadata_parse_typedef_or_ref (m, ptr, &ptr);
  		class = mono_class_get (m, token);
  		type->data.klass = class;
  		if (!class)
  			return FALSE;
  		if (!compare_type_literals (class->byval_arg.type, type->type))
  			return FALSE;
  		break;
  	}
  	case MONO_TYPE_SZARRAY: {
  		MonoType *etype = mono_metadata_parse_type_full (m, container, MONO_PARSE_MOD_TYPE, 0, ptr, &ptr);
  		if (!etype)
  			return FALSE;
  		type->data.klass = mono_class_from_mono_type (etype);
  		if (!type->data.klass)
  			return FALSE;
  		break;
  	}
  	case MONO_TYPE_PTR:
  		type->data.type = mono_metadata_parse_type_internal (m, container, MONO_PARSE_MOD_TYPE, 0, transient, ptr, &ptr);
  		if (!type->data.type)
  			return FALSE;
  		break;
  	case MONO_TYPE_FNPTR:
  		type->data.method = mono_metadata_parse_method_signature_full (m, container, 0, ptr, &ptr);
  		if (!type->data.method)
  			return FALSE;
  		break;
  	case MONO_TYPE_ARRAY:
  		type->data.array = mono_metadata_parse_array_internal (m, container, transient, ptr, &ptr);
  		if (!type->data.array)
  			return FALSE;
  		break;
  	case MONO_TYPE_MVAR:
  		if (container && !container->is_method)
  			return FALSE;
  	case MONO_TYPE_VAR:
  		type->data.generic_param = mono_metadata_parse_generic_param (m, container, type->type, ptr, &ptr);
  		if (!type->data.generic_param)
  			return FALSE;
  		break;
  	case MONO_TYPE_GENERICINST:
  		ok = do_mono_metadata_parse_generic_class (type, m, container, ptr, &ptr);
  		break;
  	default:
  		g_warning ("type 0x%02x not handled in do_mono_metadata_parse_type on image %s", type->type, m->name);
  		return FALSE;
  	}
  	
  	if (rptr)
  		*rptr = ptr;
  	return ok;
  }
  
  /*
   * mono_metadata_free_type:
   * @type: type to free
   *
   * Free the memory allocated for type @type which is allocated on the heap.
   */
  void
  mono_metadata_free_type (MonoType *type)
  {
  	if (type >= builtin_types && type < builtin_types + NBUILTIN_TYPES ())
  		return;
  	
  	switch (type->type){
  	case MONO_TYPE_OBJECT:
  	case MONO_TYPE_STRING:
  		if (!type->data.klass)
  			break;
  		/* fall through */
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_VALUETYPE:
  		if (type == &type->data.klass->byval_arg || type == &type->data.klass->this_arg)
  			return;
  		break;
  	case MONO_TYPE_PTR:
  		mono_metadata_free_type (type->data.type);
  		break;
  	case MONO_TYPE_FNPTR:
  		mono_metadata_free_method_signature (type->data.method);
  		break;
  	case MONO_TYPE_ARRAY:
  		mono_metadata_free_array (type->data.array);
  		break;
  	}
  
  	g_free (type);
  }
  
  #if 0
  static void
  hex_dump (const char *buffer, int base, int count)
  {
  	int show_header = 1;
  	int i;
  
  	if (count < 0){
  		count = -count;
  		show_header = 0;
  	}
  	
  	for (i = 0; i < count; i++){
  		if (show_header)
  			if ((i % 16) == 0)
  				printf ("\n0x%08x: ", (unsigned char) base + i);
  
  		printf ("%02x ", (unsigned char) (buffer [i]));
  	}
  	fflush (stdout);
  }
  #endif
  
  /** 
   * @ptr: Points to the beginning of the Section Data (25.3)
   */
  static MonoExceptionClause*
  parse_section_data (MonoImage *m, int *num_clauses, const unsigned char *ptr)
  {
  	unsigned char sect_data_flags;
  	const unsigned char *sptr;
  	int is_fat;
  	guint32 sect_data_len;
  	MonoExceptionClause* clauses = NULL;
  	
  	while (1) {
  		/* align on 32-bit boundary */
  		sptr = ptr = dword_align (ptr); 
  		sect_data_flags = *ptr;
  		ptr++;
  		
  		is_fat = sect_data_flags & METHOD_HEADER_SECTION_FAT_FORMAT;
  		if (is_fat) {
  			sect_data_len = (ptr [2] << 16) | (ptr [1] << 8) | ptr [0];
  			ptr += 3;
  		} else {
  			sect_data_len = ptr [0];
  			++ptr;
  		}
  		/*
  		g_print ("flags: %02x, len: %d\n", sect_data_flags, sect_data_len);
  		hex_dump (sptr, 0, sect_data_len+8);
  		g_print ("\nheader: ");
  		hex_dump (sptr-4, 0, 4);
  		g_print ("\n");
  		*/
  		
  		if (sect_data_flags & METHOD_HEADER_SECTION_EHTABLE) {
  			const unsigned char *p = dword_align (ptr);
  			int i;
  			*num_clauses = is_fat ? sect_data_len / 24: sect_data_len / 12;
  			/* we could just store a pointer if we don't need to byteswap */
  			clauses = g_malloc0 (sizeof (MonoExceptionClause) * (*num_clauses));
  			for (i = 0; i < *num_clauses; ++i) {
  				MonoExceptionClause *ec = &clauses [i];
  				guint32 tof_value;
  				if (is_fat) {
  					ec->flags = read32 (p);
  					ec->try_offset = read32 (p + 4);
  					ec->try_len = read32 (p + 8);
  					ec->handler_offset = read32 (p + 12);
  					ec->handler_len = read32 (p + 16);
  					tof_value = read32 (p + 20);
  					p += 24;
  				} else {
  					ec->flags = read16 (p);
  					ec->try_offset = read16 (p + 2);
  					ec->try_len = *(p + 4);
  					ec->handler_offset = read16 (p + 5);
  					ec->handler_len = *(p + 7);
  					tof_value = read32 (p + 8);
  					p += 12;
  				}
  				if (ec->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
  					ec->data.filter_offset = tof_value;
  				} else if (ec->flags == MONO_EXCEPTION_CLAUSE_NONE) {
  					ec->data.catch_class = tof_value? mono_class_get (m, tof_value): 0;
  				} else {
  					ec->data.catch_class = NULL;
  				}
  				/* g_print ("try %d: %x %04x-%04x %04x\n", i, ec->flags, ec->try_offset, ec->try_offset+ec->try_len, ec->try_len); */
  			}
  
  		}
  		if (sect_data_flags & METHOD_HEADER_SECTION_MORE_SECTS)
  			ptr += sect_data_len - 4; /* LAMESPEC: it seems the size includes the header */
  		else
  			return clauses;
  	}
  }
  
  /*
   * mono_method_get_header_summary:
   * @method: The method to get the header.
   * @summary: Where to store the header
   *
   *
   * Returns: true if the header was properly decoded.
   */
  gboolean
  mono_method_get_header_summary (MonoMethod *method, MonoMethodHeaderSummary *summary)
  {
  	int idx;
  	guint32 rva;
  	MonoImage* img;
  	const char *ptr;
  	unsigned char flags, format;
  	guint16 fat_flags;
  
  	/*Only the GMD has a pointer to the metadata.*/
  	while (method->is_inflated)
  		method = ((MonoMethodInflated*)method)->declaring;
  
  	summary->code_size = 0;
  	summary->has_clauses = FALSE;
  
  	/*FIXME extract this into a MACRO and share it with mono_method_get_header*/
  	if ((method->flags & METHOD_ATTRIBUTE_ABSTRACT) || (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) || (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) || (method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
  		return FALSE;
  
  	if (method->wrapper_type != MONO_WRAPPER_NONE || method->sre_method) {
  		MonoMethodHeader *header =  ((MonoMethodWrapper *)method)->header;
  		if (!header)
  			return FALSE;
  		summary->code_size = header->code_size;
  		summary->has_clauses = header->num_clauses > 0;
  		return TRUE;
  	}
  
  
  	idx = mono_metadata_token_index (method->token);
  	img = method->klass->image;
  	rva = mono_metadata_decode_row_col (&img->tables [MONO_TABLE_METHOD], idx - 1, MONO_METHOD_RVA);
  
  	/*We must run the verifier since we'll be decoding it.*/
  	if (!mono_verifier_verify_method_header (img, rva, NULL))
  		return FALSE;
  
  	ptr = mono_image_rva_map (img, rva);
  	g_assert (ptr);
  
  	flags = *(const unsigned char *)ptr;
  	format = flags & METHOD_HEADER_FORMAT_MASK;
  
  	switch (format) {
  	case METHOD_HEADER_TINY_FORMAT:
  		ptr++;
  		summary->code_size = flags >> 2;
  		break;
  	case METHOD_HEADER_FAT_FORMAT:
  		fat_flags = read16 (ptr);
  		ptr += 4;
  		summary->code_size = read32 (ptr);
  		if (fat_flags & METHOD_HEADER_MORE_SECTS)
  			summary->has_clauses = TRUE;
  		break;
  	default:
  		return FALSE;
  	}
  	return TRUE;
  }
  
  /*
   * mono_metadata_parse_mh_full:
   * @m: metadata context
   * @generic_context: generics context
   * @ptr: pointer to the method header.
   *
   * Decode the method header at @ptr, including pointer to the IL code,
   * info about local variables and optional exception tables.
   * This is a Mono runtime internal function.
   *
   * LOCKING: Acquires the loader lock.
   *
   * Returns: a transient MonoMethodHeader allocated from the heap.
   */
  MonoMethodHeader *
  mono_metadata_parse_mh_full (MonoImage *m, MonoGenericContainer *container, const char *ptr)
  {
  	MonoMethodHeader *mh;
  	unsigned char flags = *(const unsigned char *) ptr;
  	unsigned char format = flags & METHOD_HEADER_FORMAT_MASK;
  	guint16 fat_flags;
  	guint32 local_var_sig_tok, max_stack, code_size, init_locals;
  	const unsigned char *code;
  	MonoExceptionClause* clauses = NULL;
  	int hsize, num_clauses = 0;
  	MonoTableInfo *t = &m->tables [MONO_TABLE_STANDALONESIG];
  	guint32 cols [MONO_STAND_ALONE_SIGNATURE_SIZE];
  
  	g_return_val_if_fail (ptr != NULL, NULL);
  
  	switch (format) {
  	case METHOD_HEADER_TINY_FORMAT:
  		mh = g_malloc0 (MONO_SIZEOF_METHOD_HEADER);
  		ptr++;
  		mh->max_stack = 8;
  		mh->is_transient = TRUE;
  		local_var_sig_tok = 0;
  		mh->code_size = flags >> 2;
  		mh->code = (unsigned char*)ptr;
  		return mh;
  	case METHOD_HEADER_FAT_FORMAT:
  		fat_flags = read16 (ptr);
  		ptr += 2;
  		hsize = (fat_flags >> 12) & 0xf;
  		max_stack = read16 (ptr);
  		ptr += 2;
  		code_size = read32 (ptr);
  		ptr += 4;
  		local_var_sig_tok = read32 (ptr);
  		ptr += 4;
  
  		if (fat_flags & METHOD_HEADER_INIT_LOCALS)
  			init_locals = 1;
  		else
  			init_locals = 0;
  
  		code = (unsigned char*)ptr;
  
  		if (!(fat_flags & METHOD_HEADER_MORE_SECTS))
  			break;
  
  		/*
  		 * There are more sections
  		 */
  		ptr = (char*)code + code_size;
  		break;
  	default:
  		return NULL;
  	}
  
  	if (local_var_sig_tok) {
  		int idx = (local_var_sig_tok & 0xffffff)-1;
  		if (idx >= t->rows || idx < 0)
  			return NULL;
  		mono_metadata_decode_row (t, idx, cols, 1);
  
  		if (!mono_verifier_verify_standalone_signature (m, cols [MONO_STAND_ALONE_SIGNATURE], NULL))
  			return NULL;
  	}
  	if (fat_flags & METHOD_HEADER_MORE_SECTS)
  		clauses = parse_section_data (m, &num_clauses, (const unsigned char*)ptr);
  	if (local_var_sig_tok) {
  		const char *locals_ptr;
  		int len=0, i, bsize;
  
  		locals_ptr = mono_metadata_blob_heap (m, cols [MONO_STAND_ALONE_SIGNATURE]);
  		bsize = mono_metadata_decode_blob_size (locals_ptr, &locals_ptr);
  		if (*locals_ptr != 0x07)
  			g_warning ("wrong signature for locals blob");
  		locals_ptr++;
  		len = mono_metadata_decode_value (locals_ptr, &locals_ptr);
  		mh = g_malloc0 (MONO_SIZEOF_METHOD_HEADER + len * sizeof (MonoType*) + num_clauses * sizeof (MonoExceptionClause));
  		mh->num_locals = len;
  		for (i = 0; i < len; ++i) {
  			mh->locals [i] = mono_metadata_parse_type_internal (m, container,
  																MONO_PARSE_LOCAL, 0, TRUE, locals_ptr, &locals_ptr);
  			if (!mh->locals [i]) {
  				g_free (clauses);
  				g_free (mh);
  				return NULL;
  			}
  		}
  	} else {
  		mh = g_malloc0 (MONO_SIZEOF_METHOD_HEADER + num_clauses * sizeof (MonoExceptionClause));
  	}
  	mh->code = code;
  	mh->code_size = code_size;
  	mh->max_stack = max_stack;
  	mh->is_transient = TRUE;
  	mh->init_locals = init_locals;
  	if (clauses) {
  		MonoExceptionClause* clausesp = (MonoExceptionClause*)&mh->locals [mh->num_locals];
  		memcpy (clausesp, clauses, num_clauses * sizeof (MonoExceptionClause));
  		g_free (clauses);
  		mh->clauses = clausesp;
  		mh->num_clauses = num_clauses;
  	}
  	return mh;
  }
  
  /*
   * mono_metadata_parse_mh:
   * @generic_context: generics context
   * @ptr: pointer to the method header.
   *
   * Decode the method header at @ptr, including pointer to the IL code,
   * info about local variables and optional exception tables.
   * This is a Mono runtime internal function.
   *
   * Returns: a MonoMethodHeader.
   */
  MonoMethodHeader *
  mono_metadata_parse_mh (MonoImage *m, const char *ptr)
  {
  	MonoMethodHeader *res;
  
  	mono_loader_lock ();
  
  	res = mono_metadata_parse_mh_full (m, NULL, ptr);
  
  	mono_loader_unlock ();
  
  	return res;
  }
  
  /*
   * mono_metadata_free_mh:
   * @mh: a method header
   *
   * Free the memory allocated for the method header.
   */
  void
  mono_metadata_free_mh (MonoMethodHeader *mh)
  {
  	int i;
  
  	/* If it is not transient it means it's part of a wrapper method,
  	 * or a SRE-generated method, so the lifetime in that case is
  	 * dictated by the method's own lifetime
  	 */
  	if (mh->is_transient) {
  		for (i = 0; i < mh->num_locals; ++i)
  			mono_metadata_free_type (mh->locals [i]);
  		g_free (mh);
  	}
  }
  
  /*
   * mono_method_header_get_code:
   * @header: a MonoMethodHeader pointer
   * @code_size: memory location for returning the code size
   * @max_stack: memory location for returning the max stack
   *
   * Method header accessor to retreive info about the IL code properties:
   * a pointer to the IL code itself, the size of the code and the max number
   * of stack slots used by the code.
   *
   * Returns: pointer to the IL code represented by the method header.
   */
  const unsigned char*
  mono_method_header_get_code (MonoMethodHeader *header, guint32* code_size, guint32* max_stack)
  {
  	if (code_size)
  		*code_size = header->code_size;
  	if (max_stack)
  		*max_stack = header->max_stack;
  	return header->code;
  }
  
  /*
   * mono_method_header_get_locals:
   * @header: a MonoMethodHeader pointer
   * @num_locals: memory location for returning the number of local variables
   * @init_locals: memory location for returning the init_locals flag
   *
   * Method header accessor to retreive info about the local variables:
   * an array of local types, the number of locals and whether the locals
   * are supposed to be initialized to 0 on method entry
   *
   * Returns: pointer to an array of types of the local variables
   */
  MonoType**
  mono_method_header_get_locals (MonoMethodHeader *header, guint32* num_locals, gboolean *init_locals)
  {
  	if (num_locals)
  		*num_locals = header->num_locals;
  	if (init_locals)
  		*init_locals = header->init_locals;
  	return header->locals;
  }
  
  /*
   * mono_method_header_get_num_clauses:
   * @header: a MonoMethodHeader pointer
   *
   * Method header accessor to retreive the number of exception clauses.
   *
   * Returns: the number of exception clauses present
   */
  int
  mono_method_header_get_num_clauses (MonoMethodHeader *header)
  {
  	return header->num_clauses;
  }
  
  /*
   * mono_method_header_get_clauses:
   * @header: a MonoMethodHeader pointer
   * @method: MonoMethod the header belongs to
   * @iter: pointer to a iterator
   * @clause: pointer to a MonoExceptionClause structure which will be filled with the info
   *
   * Get the info about the exception clauses in the method. Set *iter to NULL to
   * initiate the iteration, then call the method repeatedly until it returns FALSE.
   * At each iteration, the structure pointed to by clause if filled with the
   * exception clause information.
   *
   * Returns: TRUE if clause was filled with info, FALSE if there are no more exception
   * clauses.
   */
  int
  mono_method_header_get_clauses (MonoMethodHeader *header, MonoMethod *method, gpointer *iter, MonoExceptionClause *clause)
  {
  	MonoExceptionClause *sc;
  	/* later we'll be able to use this interface to parse the clause info on demand,
  	 * without allocating anything.
  	 */
  	if (!iter || !header->num_clauses)
  		return FALSE;
  	if (!*iter) {
  		*iter = sc = header->clauses;
  		*clause = *sc;
  		return TRUE;
  	}
  	sc = *iter;
  	sc++;
  	if (sc < header->clauses + header->num_clauses) {
  		*iter = sc;
  		*clause = *sc;
  		return TRUE;
  	}
  	return FALSE;
  }
  
  /**
   * mono_metadata_parse_field_type:
   * @m: metadata context to extract information from
   * @ptr: pointer to the field signature
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Parses the field signature, and returns the type information for it. 
   *
   * Returns: The MonoType that was extracted from @ptr.
   */
  MonoType *
  mono_metadata_parse_field_type (MonoImage *m, short field_flags, const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_type (m, MONO_PARSE_FIELD, field_flags, ptr, rptr);
  }
  
  /**
   * mono_metadata_parse_param:
   * @m: metadata context to extract information from
   * @ptr: pointer to the param signature
   * @rptr: pointer updated to match the end of the decoded stream
   *
   * Parses the param signature, and returns the type information for it. 
   *
   * Returns: The MonoType that was extracted from @ptr.
   */
  MonoType *
  mono_metadata_parse_param (MonoImage *m, const char *ptr, const char **rptr)
  {
  	return mono_metadata_parse_type (m, MONO_PARSE_PARAM, 0, ptr, rptr);
  }
  
  /*
   * mono_metadata_token_from_dor:
   * @dor_token: A TypeDefOrRef coded index
   *
   * dor_token is a TypeDefOrRef coded index: it contains either
   * a TypeDef, TypeRef or TypeSpec in the lower bits, and the upper
   * bits contain an index into the table.
   *
   * Returns: an expanded token
   */
  guint32
  mono_metadata_token_from_dor (guint32 dor_index)
  {
  	guint32 table, idx;
  
  	table = dor_index & 0x03;
  	idx = dor_index >> 2;
  
  	switch (table){
  	case 0: /* TypeDef */
  		return MONO_TOKEN_TYPE_DEF | idx;
  	case 1: /* TypeRef */
  		return MONO_TOKEN_TYPE_REF | idx;
  	case 2: /* TypeSpec */
  		return MONO_TOKEN_TYPE_SPEC | idx;
  	default:
  		g_assert_not_reached ();
  	}
  
  	return 0;
  }
  
  /*
   * We use this to pass context information to the row locator
   */
  typedef struct {
  	int idx;			/* The index that we are trying to locate */
  	int col_idx;		/* The index in the row where idx may be stored */
  	MonoTableInfo *t;	/* pointer to the table */
  	guint32 result;
  } locator_t;
  
  /*
   * How the row locator works.
   *
   *   Table A
   *   ___|___
   *   ___|___         Table B
   *   ___|___------>  _______
   *   ___|___         _______
   *   
   * A column in the rows of table A references an index in table B.
   * For example A may be the TYPEDEF table and B the METHODDEF table.
   * 
   * Given an index in table B we want to get the row in table A
   * where the column n references our index in B.
   *
   * In the locator_t structure:
   * 	t is table A
   * 	col_idx is the column number
   * 	index is the index in table B
   * 	result will be the index in table A
   *
   * Examples:
   * Table A		Table B		column (in table A)
   * TYPEDEF		METHODDEF   MONO_TYPEDEF_METHOD_LIST
   * TYPEDEF		FIELD		MONO_TYPEDEF_FIELD_LIST
   * PROPERTYMAP	PROPERTY	MONO_PROPERTY_MAP_PROPERTY_LIST
   * INTERFIMPL	TYPEDEF   	MONO_INTERFACEIMPL_CLASS
   * METHODSEM	PROPERTY	ASSOCIATION (encoded index)
   *
   * Note that we still don't support encoded indexes.
   *
   */
  static int
  typedef_locator (const void *a, const void *b)
  {
  	locator_t *loc = (locator_t *) a;
  	const char *bb = (const char *) b;
  	int typedef_index = (bb - loc->t->base) / loc->t->row_size;
  	guint32 col, col_next;
  
  	col = mono_metadata_decode_row_col (loc->t, typedef_index, loc->col_idx);
  
  	if (loc->idx < col)
  		return -1;
  
  	/*
  	 * Need to check that the next row is valid.
  	 */
  	if (typedef_index + 1 < loc->t->rows) {
  		col_next = mono_metadata_decode_row_col (loc->t, typedef_index + 1, loc->col_idx);
  		if (loc->idx >= col_next)
  			return 1;
  
  		if (col == col_next)
  			return 1; 
  	}
  
  	loc->result = typedef_index;
  	
  	return 0;
  }
  
  static int
  table_locator (const void *a, const void *b)
  {
  	locator_t *loc = (locator_t *) a;
  	const char *bb = (const char *) b;
  	guint32 table_index = (bb - loc->t->base) / loc->t->row_size;
  	guint32 col;
  	
  	col = mono_metadata_decode_row_col (loc->t, table_index, loc->col_idx);
  
  	if (loc->idx == col) {
  		loc->result = table_index;
  		return 0;
  	}
  	if (loc->idx < col)
  		return -1;
  	else 
  		return 1;
  }
  
  static int
  declsec_locator (const void *a, const void *b)
  {
  	locator_t *loc = (locator_t *) a;
  	const char *bb = (const char *) b;
  	guint32 table_index = (bb - loc->t->base) / loc->t->row_size;
  	guint32 col;
  
  	col = mono_metadata_decode_row_col (loc->t, table_index, loc->col_idx);
  
  	if (loc->idx == col) {
  		loc->result = table_index;
  		return 0;
  	}
  	if (loc->idx < col)
  		return -1;
  	else
  		return 1;
  }
  
  /**
   * search_ptr_table:
   *
   *  Return the 1-based row index in TABLE, which must be one of the *Ptr tables, 
   * which contains IDX.
   */
  static guint32
  search_ptr_table (MonoImage *image, int table, int idx)
  {
  	MonoTableInfo *ptrdef = &image->tables [table];
  	int i;
  
  	/* Use a linear search to find our index in the table */
  	for (i = 0; i < ptrdef->rows; i ++)
  		/* All the Ptr tables have the same structure */
  		if (mono_metadata_decode_row_col (ptrdef, i, 0) == idx)
  			break;
  
  	if (i < ptrdef->rows)
  		return i + 1;
  	else
  		return idx;
  }
  
  /**
   * mono_metadata_typedef_from_field:
   * @meta: metadata context
   * @index: FieldDef token
   *
   * Returns: the 1-based index into the TypeDef table of the type that
   * declared the field described by @index, or 0 if not found.
   */
  guint32
  mono_metadata_typedef_from_field (MonoImage *meta, guint32 index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_TYPEDEF];
  	locator_t loc;
  
  	if (!tdef->base)
  		return 0;
  
  	loc.idx = mono_metadata_token_index (index);
  	loc.col_idx = MONO_TYPEDEF_FIELD_LIST;
  	loc.t = tdef;
  
  	if (meta->uncompressed_metadata)
  		loc.idx = search_ptr_table (meta, MONO_TABLE_FIELD_POINTER, loc.idx);
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, typedef_locator))
  		return 0;
  
  	/* loc_result is 0..1, needs to be mapped to table index (that is +1) */
  	return loc.result + 1;
  }
  
  /*
   * mono_metadata_typedef_from_method:
   * @meta: metadata context
   * @index: MethodDef token
   *
   * Returns: the 1-based index into the TypeDef table of the type that
   * declared the method described by @index.  0 if not found.
   */
  guint32
  mono_metadata_typedef_from_method (MonoImage *meta, guint32 index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_TYPEDEF];
  	locator_t loc;
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.idx = mono_metadata_token_index (index);
  	loc.col_idx = MONO_TYPEDEF_METHOD_LIST;
  	loc.t = tdef;
  
  	if (meta->uncompressed_metadata)
  		loc.idx = search_ptr_table (meta, MONO_TABLE_METHOD_POINTER, loc.idx);
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, typedef_locator))
  		return 0;
  
  	/* loc_result is 0..1, needs to be mapped to table index (that is +1) */
  	return loc.result + 1;
  }
  
  /*
   * mono_metadata_interfaces_from_typedef_full:
   * @meta: metadata context
   * @index: typedef token
   * @interfaces: Out parameter used to store the interface array
   * @count: Out parameter used to store the number of interfaces
   * @heap_alloc_result: if TRUE the result array will be g_malloc'd
   * @context: The generic context
   * 
   * The array of interfaces that the @index typedef token implements is returned in
   * @interfaces. The number of elements in the array is returned in @count. 
   *
   * LOCKING: Assumes the loader lock is held.
   *
   * Returns: TRUE on success, FALSE on failure.
   */
  gboolean
  mono_metadata_interfaces_from_typedef_full (MonoImage *meta, guint32 index, MonoClass ***interfaces, guint *count, gboolean heap_alloc_result, MonoGenericContext *context)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_INTERFACEIMPL];
  	locator_t loc;
  	guint32 start, pos;
  	guint32 cols [MONO_INTERFACEIMPL_SIZE];
  	MonoClass **result;
  
  	*interfaces = NULL;
  	*count = 0;
  
  	if (!tdef->base)
  		return TRUE;
  
  	loc.idx = mono_metadata_token_index (index);
  	loc.col_idx = MONO_INTERFACEIMPL_CLASS;
  	loc.t = tdef;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return TRUE;
  
  	start = loc.result;
  	/*
  	 * We may end up in the middle of the rows... 
  	 */
  	while (start > 0) {
  		if (loc.idx == mono_metadata_decode_row_col (tdef, start - 1, MONO_INTERFACEIMPL_CLASS))
  			start--;
  		else
  			break;
  	}
  	pos = start;
  	while (pos < tdef->rows) {
  		mono_metadata_decode_row (tdef, pos, cols, MONO_INTERFACEIMPL_SIZE);
  		if (cols [MONO_INTERFACEIMPL_CLASS] != loc.idx)
  			break;
  		++pos;
  	}
  
  	if (heap_alloc_result)
  		result = g_new0 (MonoClass*, pos - start);
  	else
  		result = mono_image_alloc0 (meta, sizeof (MonoClass*) * (pos - start));
  
  	pos = start;
  	while (pos < tdef->rows) {
  		MonoClass *iface;
  		
  		mono_metadata_decode_row (tdef, pos, cols, MONO_INTERFACEIMPL_SIZE);
  		if (cols [MONO_INTERFACEIMPL_CLASS] != loc.idx)
  			break;
  		iface = mono_class_get_full (
  			meta, mono_metadata_token_from_dor (cols [MONO_INTERFACEIMPL_INTERFACE]), context);
  		if (iface == NULL)
  			return FALSE;
  		result [pos - start] = iface;
  		++pos;
  	}
  	*count = pos - start;
  	*interfaces = result;
  	return TRUE;
  }
  
  /*
   * @meta: metadata context
   * @index: typedef token
   * @count: Out parameter used to store the number of interfaces
   * 
   * The array of interfaces that the @index typedef token implements is returned in
   * @interfaces. The number of elements in the array is returned in @count. The returned
   * array is g_malloc'd and the caller must free it.
   *
   * LOCKING: Acquires the loader lock .
   *
   * Returns: the interface array on success, NULL on failure.
   */
  
  MonoClass**
  mono_metadata_interfaces_from_typedef (MonoImage *meta, guint32 index, guint *count)
  {
  	MonoClass **interfaces;
  	gboolean rv;
  
  	mono_loader_lock ();
  	rv = mono_metadata_interfaces_from_typedef_full (meta, index, &interfaces, count, TRUE, NULL);
  	mono_loader_unlock ();
  	if (rv)
  		return interfaces;
  	else
  		return NULL;
  }
  
  /*
   * mono_metadata_nested_in_typedef:
   * @meta: metadata context
   * @index: typedef token
   * 
   * Returns: the 1-based index into the TypeDef table of the type
   * where the type described by @index is nested.
   * Returns 0 if @index describes a non-nested type.
   */
  guint32
  mono_metadata_nested_in_typedef (MonoImage *meta, guint32 index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_NESTEDCLASS];
  	locator_t loc;
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.idx = mono_metadata_token_index (index);
  	loc.col_idx = MONO_NESTED_CLASS_NESTED;
  	loc.t = tdef;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  
  	/* loc_result is 0..1, needs to be mapped to table index (that is +1) */
  	return mono_metadata_decode_row_col (tdef, loc.result, MONO_NESTED_CLASS_ENCLOSING) | MONO_TOKEN_TYPE_DEF;
  }
  
  /*
   * mono_metadata_nesting_typedef:
   * @meta: metadata context
   * @index: typedef token
   * 
   * Returns: the 1-based index into the TypeDef table of the first type
   * that is nested inside the type described by @index. The search starts at
   * @start_index.  returns 0 if no such type is found.
   */
  guint32
  mono_metadata_nesting_typedef (MonoImage *meta, guint32 index, guint32 start_index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_NESTEDCLASS];
  	guint32 start;
  	guint32 class_index = mono_metadata_token_index (index);
  	
  	if (!tdef->base)
  		return 0;
  
  	start = start_index;
  
  	while (start <= tdef->rows) {
  		if (class_index == mono_metadata_decode_row_col (tdef, start - 1, MONO_NESTED_CLASS_ENCLOSING))
  			break;
  		else
  			start++;
  	}
  
  	if (start > tdef->rows)
  		return 0;
  	else
  		return start;
  }
  
  /*
   * mono_metadata_packing_from_typedef:
   * @meta: metadata context
   * @index: token representing a type
   * 
   * Returns: the info stored in the ClassLAyout table for the given typedef token
   * into the @packing and @size pointers.
   * Returns 0 if the info is not found.
   */
  guint32
  mono_metadata_packing_from_typedef (MonoImage *meta, guint32 index, guint32 *packing, guint32 *size)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_CLASSLAYOUT];
  	locator_t loc;
  	guint32 cols [MONO_CLASS_LAYOUT_SIZE];
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.idx = mono_metadata_token_index (index);
  	loc.col_idx = MONO_CLASS_LAYOUT_PARENT;
  	loc.t = tdef;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  
  	mono_metadata_decode_row (tdef, loc.result, cols, MONO_CLASS_LAYOUT_SIZE);
  	if (packing)
  		*packing = cols [MONO_CLASS_LAYOUT_PACKING_SIZE];
  	if (size)
  		*size = cols [MONO_CLASS_LAYOUT_CLASS_SIZE];
  
  	/* loc_result is 0..1, needs to be mapped to table index (that is +1) */
  	return loc.result + 1;
  }
  
  /*
   * mono_metadata_custom_attrs_from_index:
   * @meta: metadata context
   * @index: token representing the parent
   * 
   * Returns: the 1-based index into the CustomAttribute table of the first 
   * attribute which belongs to the metadata object described by @index.
   * Returns 0 if no such attribute is found.
   */
  guint32
  mono_metadata_custom_attrs_from_index (MonoImage *meta, guint32 index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_CUSTOMATTRIBUTE];
  	locator_t loc;
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.idx = index;
  	loc.col_idx = MONO_CUSTOM_ATTR_PARENT;
  	loc.t = tdef;
  
  	/* FIXME: Index translation */
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  
  	/* Find the first entry by searching backwards */
  	while ((loc.result > 0) && (mono_metadata_decode_row_col (tdef, loc.result - 1, MONO_CUSTOM_ATTR_PARENT) == index))
  		loc.result --;
  
  	/* loc_result is 0..1, needs to be mapped to table index (that is +1) */
  	return loc.result + 1;
  }
  
  /*
   * mono_metadata_declsec_from_index:
   * @meta: metadata context
   * @index: token representing the parent
   * 
   * Returns: the 0-based index into the DeclarativeSecurity table of the first 
   * attribute which belongs to the metadata object described by @index.
   * Returns -1 if no such attribute is found.
   */
  guint32
  mono_metadata_declsec_from_index (MonoImage *meta, guint32 index)
  {
  	MonoTableInfo *tdef = &meta->tables [MONO_TABLE_DECLSECURITY];
  	locator_t loc;
  
  	if (!tdef->base)
  		return -1;
  
  	loc.idx = index;
  	loc.col_idx = MONO_DECL_SECURITY_PARENT;
  	loc.t = tdef;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, declsec_locator))
  		return -1;
  
  	/* Find the first entry by searching backwards */
  	while ((loc.result > 0) && (mono_metadata_decode_row_col (tdef, loc.result - 1, MONO_DECL_SECURITY_PARENT) == index))
  		loc.result --;
  
  	return loc.result;
  }
  
  #ifdef DEBUG
  static void
  mono_backtrace (int limit)
  {
  	void *array[limit];
  	char **names;
  	int i;
  	backtrace (array, limit);
  	names = backtrace_symbols (array, limit);
  	for (i =0; i < limit; ++i) {
  		g_print ("\t%s\n", names [i]);
  	}
  	g_free (names);
  }
  #endif
  
  #define abi__alignof__(type) G_STRUCT_OFFSET(struct { char c; type x; }, x)
  
  /*
   * mono_type_size:
   * @t: the type to return the size of
   *
   * Returns: the number of bytes required to hold an instance of this
   * type in memory
   */
  int
  mono_type_size (MonoType *t, int *align)
  {
  	if (!t) {
  		*align = 1;
  		return 0;
  	}
  	if (t->byref) {
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	}
  
  	switch (t->type){
  	case MONO_TYPE_VOID:
  		*align = 1;
  		return 0;
  	case MONO_TYPE_BOOLEAN:
  		*align = abi__alignof__(gint8);
  		return 1;
  	case MONO_TYPE_I1:
  	case MONO_TYPE_U1:
  		*align = abi__alignof__(gint8);
  		return 1;
  	case MONO_TYPE_CHAR:
  	case MONO_TYPE_I2:
  	case MONO_TYPE_U2:
  		*align = abi__alignof__(gint16);
  		return 2;		
  	case MONO_TYPE_I4:
  	case MONO_TYPE_U4:
  		*align = abi__alignof__(gint32);
  		return 4;
  	case MONO_TYPE_R4:
  		*align = abi__alignof__(float);
  		return 4;
  	case MONO_TYPE_I8:
  	case MONO_TYPE_U8:
  		*align = abi__alignof__(gint64);
  		return 8;		
  	case MONO_TYPE_R8:
  		*align = abi__alignof__(double);
  		return 8;		
  	case MONO_TYPE_I:
  	case MONO_TYPE_U:
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	case MONO_TYPE_STRING:
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	case MONO_TYPE_OBJECT:
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	case MONO_TYPE_VALUETYPE: {
  		if (t->data.klass->enumtype)
  			return mono_type_size (mono_class_enum_basetype (t->data.klass), align);
  		else
  			return mono_class_value_size (t->data.klass, (guint32*)align);
  	}
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_SZARRAY:
  	case MONO_TYPE_PTR:
  	case MONO_TYPE_FNPTR:
  	case MONO_TYPE_ARRAY:
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	case MONO_TYPE_TYPEDBYREF:
  		return mono_class_value_size (mono_defaults.typed_reference_class, (guint32*)align);
  	case MONO_TYPE_GENERICINST: {
  		MonoGenericClass *gclass = t->data.generic_class;
  		MonoClass *container_class = gclass->container_class;
  
  		// g_assert (!gclass->inst->is_open);
  
  		if (container_class->valuetype) {
  			if (container_class->enumtype)
  				return mono_type_size (mono_class_enum_basetype (container_class), align);
  			else
  				return mono_class_value_size (mono_class_from_mono_type (t), (guint32*)align);
  		} else {
  			*align = abi__alignof__(gpointer);
  			return sizeof (gpointer);
  		}
  	}
  	case MONO_TYPE_VAR:
  	case MONO_TYPE_MVAR:
  		/* FIXME: Martin, this is wrong. */
  		*align = abi__alignof__(gpointer);
  		return sizeof (gpointer);
  	default:
  		g_error ("mono_type_size: type 0x%02x unknown", t->type);
  	}
  	return 0;
  }
  
  /*
   * mono_type_stack_size:
   * @t: the type to return the size it uses on the stack
   *
   * Returns: the number of bytes required to hold an instance of this
   * type on the runtime stack
   */
  int
  mono_type_stack_size (MonoType *t, int *align)
  {
  	return mono_type_stack_size_internal (t, align, FALSE);
  }
  
  int
  mono_type_stack_size_internal (MonoType *t, int *align, gboolean allow_open)
  {
  	int tmp;
  #if SIZEOF_VOID_P == SIZEOF_REGISTER
  	int stack_slot_size = sizeof (gpointer);
  	int stack_slot_align = abi__alignof__ (gpointer);
  #elif SIZEOF_VOID_P < SIZEOF_REGISTER
  	int stack_slot_size = SIZEOF_REGISTER;
  	int stack_slot_align = SIZEOF_REGISTER;
  #endif
  
  	g_assert (t != NULL);
  
  	if (!align)
  		align = &tmp;
  
  	if (t->byref) {
  		*align = stack_slot_align;
  		return stack_slot_size;
  	}
  
  	switch (t->type){
  	case MONO_TYPE_BOOLEAN:
  	case MONO_TYPE_CHAR:
  	case MONO_TYPE_I1:
  	case MONO_TYPE_U1:
  	case MONO_TYPE_I2:
  	case MONO_TYPE_U2:
  	case MONO_TYPE_I4:
  	case MONO_TYPE_U4:
  	case MONO_TYPE_I:
  	case MONO_TYPE_U:
  	case MONO_TYPE_STRING:
  	case MONO_TYPE_OBJECT:
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_SZARRAY:
  	case MONO_TYPE_PTR:
  	case MONO_TYPE_FNPTR:
  	case MONO_TYPE_ARRAY:
  		*align = stack_slot_align;
  		return stack_slot_size;
  	case MONO_TYPE_VAR:
  	case MONO_TYPE_MVAR:
  		g_assert (allow_open);
  		*align = stack_slot_align;
  		return stack_slot_size;
  	case MONO_TYPE_TYPEDBYREF:
  		*align = stack_slot_align;
  		return stack_slot_size * 3;
  	case MONO_TYPE_R4:
  		*align = abi__alignof__(float);
  		return sizeof (float);		
  	case MONO_TYPE_I8:
  	case MONO_TYPE_U8:
  		*align = abi__alignof__(gint64);
  		return sizeof (gint64);		
  	case MONO_TYPE_R8:
  		*align = abi__alignof__(double);
  		return sizeof (double);
  	case MONO_TYPE_VALUETYPE: {
  		guint32 size;
  
  		if (t->data.klass->enumtype)
  			return mono_type_stack_size_internal (mono_class_enum_basetype (t->data.klass), align, allow_open);
  		else {
  			size = mono_class_value_size (t->data.klass, (guint32*)align);
  
  			*align = *align + stack_slot_align - 1;
  			*align &= ~(stack_slot_align - 1);
  
  			size += stack_slot_size - 1;
  			size &= ~(stack_slot_size - 1);
  
  			return size;
  		}
  	}
  	case MONO_TYPE_GENERICINST: {
  		MonoGenericClass *gclass = t->data.generic_class;
  		MonoClass *container_class = gclass->container_class;
  
  		if (!allow_open)
  			g_assert (!gclass->context.class_inst->is_open);
  
  		if (container_class->valuetype) {
  			if (container_class->enumtype)
  				return mono_type_stack_size_internal (mono_class_enum_basetype (container_class), align, allow_open);
  			else {
  				guint32 size = mono_class_value_size (mono_class_from_mono_type (t), (guint32*)align);
  
  				*align = *align + stack_slot_align - 1;
  				*align &= ~(stack_slot_align - 1);
  
  				size += stack_slot_size - 1;
  				size &= ~(stack_slot_size - 1);
  
  				return size;
  			}
  		} else {
  			*align = stack_slot_align;
  			return stack_slot_size;
  		}
  	}
  	default:
  		g_error ("type 0x%02x unknown", t->type);
  	}
  	return 0;
  }
  
  gboolean
  mono_type_generic_inst_is_valuetype (MonoType *type)
  {
  	g_assert (type->type == MONO_TYPE_GENERICINST);
  	return type->data.generic_class->container_class->valuetype;
  }
  
  gboolean
  mono_metadata_generic_class_is_valuetype (MonoGenericClass *gclass)
  {
  	return gclass->container_class->valuetype;
  }
  
  static gboolean
  _mono_metadata_generic_class_equal (const MonoGenericClass *g1, const MonoGenericClass *g2, gboolean signature_only)
  {
  	MonoGenericInst *i1 = g1->context.class_inst;
  	MonoGenericInst *i2 = g2->context.class_inst;
  
  	if (g1->is_dynamic != g2->is_dynamic)
  		return FALSE;
  	if (!mono_metadata_class_equal (g1->container_class, g2->container_class, signature_only))
  		return FALSE;
  	if (!mono_generic_inst_equal_full (i1, i2, signature_only))
  		return FALSE;
  	return g1->is_tb_open == g2->is_tb_open;
  }
  
  static gboolean
  _mono_metadata_generic_class_container_equal (const MonoGenericClass *g1, MonoClass *c2, gboolean signature_only)
  {
  	MonoGenericInst *i1 = g1->context.class_inst;
  	MonoGenericInst *i2 = c2->generic_container->context.class_inst;
  
  	if (!mono_metadata_class_equal (g1->container_class, c2, signature_only))
  		return FALSE;
  	if (!mono_generic_inst_equal_full (i1, i2, signature_only))
  		return FALSE;
  	return !g1->is_tb_open;
  }
  
  guint
  mono_metadata_generic_context_hash (const MonoGenericContext *context)
  {
  	/* FIXME: check if this seed is good enough */
  	guint hash = 0xc01dfee7;
  	if (context->class_inst)
  		hash = ((hash << 5) - hash) ^ mono_metadata_generic_inst_hash (context->class_inst);
  	if (context->method_inst)
  		hash = ((hash << 5) - hash) ^ mono_metadata_generic_inst_hash (context->method_inst);
  	return hash;
  }
  
  gboolean
  mono_metadata_generic_context_equal (const MonoGenericContext *g1, const MonoGenericContext *g2)
  {
  	return g1->class_inst == g2->class_inst && g1->method_inst == g2->method_inst;
  }
  
  /*
   * mono_metadata_str_hash:
   *
   *   This should be used instead of g_str_hash for computing hash codes visible
   * outside this module, since g_str_hash () is not guaranteed to be stable
   * (its not the same in eglib for example).
   */
  guint
  mono_metadata_str_hash (gconstpointer v1)
  {
  	/* Same as g_str_hash () in glib */
  	char *p = (char *) v1;
  	guint hash = *p;
  
  	while (*p++) {
  		if (*p)
  			hash = (hash << 5) - hash + *p;
  	}
  
  	return hash;
  } 
  
  /*
   * mono_metadata_type_hash:
   * @t1: a type
   *
   * Computes an hash value for @t1 to be used in GHashTable.
   * The returned hash is guaranteed to be the same across executions.
   */
  guint
  mono_metadata_type_hash (MonoType *t1)
  {
  	guint hash = t1->type;
  
  	hash |= t1->byref << 6; /* do not collide with t1->type values */
  	switch (t1->type) {
  	case MONO_TYPE_VALUETYPE:
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_SZARRAY: {
  		MonoClass *class = t1->data.klass;
  		/*
  		 * Dynamic classes must not be hashed on their type since it can change
  		 * during runtime. For example, if we hash a reference type that is
  		 * later made into a valuetype.
  		 *
  		 * This is specially problematic with generic instances since they are
  		 * inserted in a bunch of hash tables before been finished.
  		 */
  		if (class->image->dynamic)
  			return (t1->byref << 6) | mono_metadata_str_hash (class->name);
  		return ((hash << 5) - hash) ^ mono_metadata_str_hash (class->name);
  	}
  	case MONO_TYPE_PTR:
  		return ((hash << 5) - hash) ^ mono_metadata_type_hash (t1->data.type);
  	case MONO_TYPE_ARRAY:
  		return ((hash << 5) - hash) ^ mono_metadata_type_hash (&t1->data.array->eklass->byval_arg);
  	case MONO_TYPE_GENERICINST:
  		return ((hash << 5) - hash) ^ mono_generic_class_hash (t1->data.generic_class);
  	case MONO_TYPE_VAR:
  	case MONO_TYPE_MVAR:
  		return ((hash << 5) - hash) ^ mono_metadata_generic_param_hash (t1->data.generic_param);
  	}
  	return hash;
  }
  
  static guint
  mono_metadata_generic_param_hash (MonoGenericParam *p)
  {
  	guint hash;
  	MonoGenericParamInfo *info;
  
  	hash = (mono_generic_param_num (p) << 2) | p->serial;
  	info = mono_generic_param_info (p);
  	/* Can't hash on the owner klass/method, since those might not be set when this is called */
  	if (info)
  		hash = ((hash << 5) - hash) ^ info->token;
  	return hash;
  }
  
  static gboolean
  mono_metadata_generic_param_equal (MonoGenericParam *p1, MonoGenericParam *p2, gboolean signature_only)
  {
  	if (p1 == p2)
  		return TRUE;
  	if (mono_generic_param_num (p1) != mono_generic_param_num (p2))
  		return FALSE;
  	if (p1->serial != p2->serial)
  		return FALSE;
  
  	/*
  	 * We have to compare the image as well because if we didn't,
  	 * the generic_inst_cache lookup wouldn't care about the image
  	 * of generic params, so what could happen is that a generic
  	 * inst with params from image A is put into the cache, then
  	 * image B gets that generic inst from the cache, image A is
  	 * unloaded, so the inst is deleted, but image B still retains
  	 * a pointer to it.
  	 *
  	 * The AOT runtime doesn't set the image when it's decoding
  	 * types, so we only compare it when the owner is NULL.
  	 */
  	if (mono_generic_param_owner (p1) == mono_generic_param_owner (p2) &&
  	    (mono_generic_param_owner (p1) || p1->image == p2->image))
  		return TRUE;
  
  	/*
  	 * If `signature_only' is true, we're comparing two (method) signatures.
  	 * In this case, the owner of two type parameters doesn't need to match.
  	 */
  
  	return signature_only;
  }
  
  static gboolean
  mono_metadata_class_equal (MonoClass *c1, MonoClass *c2, gboolean signature_only)
  {
  	if (c1 == c2)
  		return TRUE;
  	if (c1->generic_class && c2->generic_class)
  		return _mono_metadata_generic_class_equal (c1->generic_class, c2->generic_class, signature_only);
  	if (c1->generic_class && c2->generic_container)
  		return _mono_metadata_generic_class_container_equal (c1->generic_class, c2, signature_only);
  	if (c1->generic_container && c2->generic_class)
  		return _mono_metadata_generic_class_container_equal (c2->generic_class, c1, signature_only);
  	if ((c1->byval_arg.type == MONO_TYPE_VAR) && (c2->byval_arg.type == MONO_TYPE_VAR))
  		return mono_metadata_generic_param_equal (
  			c1->byval_arg.data.generic_param, c2->byval_arg.data.generic_param, signature_only);
  	if ((c1->byval_arg.type == MONO_TYPE_MVAR) && (c2->byval_arg.type == MONO_TYPE_MVAR))
  		return mono_metadata_generic_param_equal (
  			c1->byval_arg.data.generic_param, c2->byval_arg.data.generic_param, signature_only);
  	if (signature_only &&
  	    (c1->byval_arg.type == MONO_TYPE_SZARRAY) && (c2->byval_arg.type == MONO_TYPE_SZARRAY))
  		return mono_metadata_class_equal (c1->byval_arg.data.klass, c2->byval_arg.data.klass, signature_only);
  	if (signature_only &&
  	    (c1->byval_arg.type == MONO_TYPE_ARRAY) && (c2->byval_arg.type == MONO_TYPE_ARRAY))
  		return do_mono_metadata_type_equal (&c1->byval_arg, &c2->byval_arg, signature_only);
  	return FALSE;
  }
  
  static gboolean
  mono_metadata_fnptr_equal (MonoMethodSignature *s1, MonoMethodSignature *s2, gboolean signature_only)
  {
  	gpointer iter1 = 0, iter2 = 0;
  
  	if (s1 == s2)
  		return TRUE;
  	if (s1->call_convention != s2->call_convention)
  		return FALSE;
  	if (s1->sentinelpos != s2->sentinelpos)
  		return FALSE;
  	if (s1->hasthis != s2->hasthis)
  		return FALSE;
  	if (s1->explicit_this != s2->explicit_this)
  		return FALSE;
  	if (! do_mono_metadata_type_equal (s1->ret, s2->ret, signature_only))
  		return FALSE;
  	if (s1->param_count != s2->param_count)
  		return FALSE;
  
  	while (TRUE) {
  		MonoType *t1 = mono_signature_get_params (s1, &iter1);
  		MonoType *t2 = mono_signature_get_params (s2, &iter2);
  
  		if (t1 == NULL || t2 == NULL)
  			return (t1 == t2);
  		if (! do_mono_metadata_type_equal (t1, t2, signature_only))
  			return FALSE;
  	}
  }
  
  /*
   * mono_metadata_type_equal:
   * @t1: a type
   * @t2: another type
   *
   * Determine if @t1 and @t2 represent the same type.
   * Returns: #TRUE if @t1 and @t2 are equal.
   */
  static gboolean
  do_mono_metadata_type_equal (MonoType *t1, MonoType *t2, gboolean signature_only)
  {
  	if (t1->type != t2->type || t1->byref != t2->byref)
  		return FALSE;
  
  	switch (t1->type) {
  	case MONO_TYPE_VOID:
  	case MONO_TYPE_BOOLEAN:
  	case MONO_TYPE_CHAR:
  	case MONO_TYPE_I1:
  	case MONO_TYPE_U1:
  	case MONO_TYPE_I2:
  	case MONO_TYPE_U2:
  	case MONO_TYPE_I4:
  	case MONO_TYPE_U4:
  	case MONO_TYPE_I8:
  	case MONO_TYPE_U8:
  	case MONO_TYPE_R4:
  	case MONO_TYPE_R8:
  	case MONO_TYPE_STRING:
  	case MONO_TYPE_I:
  	case MONO_TYPE_U:
  	case MONO_TYPE_OBJECT:
  	case MONO_TYPE_TYPEDBYREF:
  		return TRUE;
  	case MONO_TYPE_VALUETYPE:
  	case MONO_TYPE_CLASS:
  	case MONO_TYPE_SZARRAY:
  		return mono_metadata_class_equal (t1->data.klass, t2->data.klass, signature_only);
  	case MONO_TYPE_PTR:
  		return do_mono_metadata_type_equal (t1->data.type, t2->data.type, signature_only);
  	case MONO_TYPE_ARRAY:
  		if (t1->data.array->rank != t2->data.array->rank)
  			return FALSE;
  		return mono_metadata_class_equal (t1->data.array->eklass, t2->data.array->eklass, signature_only);
  	case MONO_TYPE_GENERICINST:
  		return _mono_metadata_generic_class_equal (
  			t1->data.generic_class, t2->data.generic_class, signature_only);
  	case MONO_TYPE_VAR:
  		return mono_metadata_generic_param_equal (
  			t1->data.generic_param, t2->data.generic_param, signature_only);
  	case MONO_TYPE_MVAR:
  		return mono_metadata_generic_param_equal (
  			t1->data.generic_param, t2->data.generic_param, signature_only);
  	case MONO_TYPE_FNPTR:
  		return mono_metadata_fnptr_equal (t1->data.method, t2->data.method, signature_only);
  	default:
  		g_error ("implement type compare for %0x!", t1->type);
  		return FALSE;
  	}
  
  	return FALSE;
  }
  
  gboolean
  mono_metadata_type_equal (MonoType *t1, MonoType *t2)
  {
  	return do_mono_metadata_type_equal (t1, t2, FALSE);
  }
  
  /**
   * mono_metadata_type_equal_full:
   * @t1: a type
   * @t2: another type
   * @signature_only: if signature only comparison should be made
   *
   * Determine if @t1 and @t2 are signature compatible if @signature_only is #TRUE, otherwise
   * behaves the same way as mono_metadata_type_equal.
   * The function mono_metadata_type_equal(a, b) is just a shortcut for mono_metadata_type_equal_full(a, b, FALSE).
   * Returns: #TRUE if @t1 and @t2 are equal taking @signature_only into account.
   */
  gboolean
  mono_metadata_type_equal_full (MonoType *t1, MonoType *t2, gboolean signature_only)
  {
  	return do_mono_metadata_type_equal (t1, t2, signature_only);
  }
  
  /**
   * mono_metadata_signature_equal:
   * @sig1: a signature
   * @sig2: another signature
   *
   * Determine if @sig1 and @sig2 represent the same signature, with the
   * same number of arguments and the same types.
   * Returns: #TRUE if @sig1 and @sig2 are equal.
   */
  gboolean
  mono_metadata_signature_equal (MonoMethodSignature *sig1, MonoMethodSignature *sig2)
  {
  	int i;
  
  	if (sig1->hasthis != sig2->hasthis || sig1->param_count != sig2->param_count)
  		return FALSE;
  
  	if (sig1->generic_param_count != sig2->generic_param_count)
  		return FALSE;
  
  	/*
  	 * We're just comparing the signatures of two methods here:
  	 *
  	 * If we have two generic methods `void Foo<U> (U u)' and `void Bar<V> (V v)',
  	 * U and V are equal here.
  	 *
  	 * That's what the `signature_only' argument of do_mono_metadata_type_equal() is for.
  	 */
  
  	for (i = 0; i < sig1->param_count; i++) { 
  		MonoType *p1 = sig1->params[i];
  		MonoType *p2 = sig2->params[i];
  		
  		/* if (p1->attrs != p2->attrs)
  			return FALSE;
  		*/
  		if (!do_mono_metadata_type_equal (p1, p2, TRUE))
  			return FALSE;
  	}
  
  	if (!do_mono_metadata_type_equal (sig1->ret, sig2->ret, TRUE))
  		return FALSE;
  	return TRUE;
  }
  
  /**
   * mono_metadata_type_dup:
   * @image: image to alloc memory from
   * @original: type to duplicate
   *
   * Returns: copy of type allocated from the image's mempool (or from the heap, if @image is null).
   */
  MonoType *
  mono_metadata_type_dup (MonoImage *image, const MonoType *o)
  {
  	MonoType *r = NULL;
  	int sizeof_o = MONO_SIZEOF_TYPE;
  	if (o->num_mods)
  		sizeof_o += o->num_mods  * sizeof (MonoCustomMod);
  
  	r = image ? mono_image_alloc0 (image, sizeof_o) : g_malloc (sizeof_o);
  
  	memcpy (r, o, sizeof_o);
  
  	if (o->type == MONO_TYPE_PTR) {
  		r->data.type = mono_metadata_type_dup (image, o->data.type);
  	} else if (o->type == MONO_TYPE_ARRAY) {
  		r->data.array = mono_dup_array_type (image, o->data.array);
  	} else if (o->type == MONO_TYPE_FNPTR) {
  		/*FIXME the dup'ed signature is leaked mono_metadata_free_type*/
  		r->data.method = mono_metadata_signature_deep_dup (image, o->data.method);
  	}
  	return r;
  }
  
  guint
  mono_signature_hash (MonoMethodSignature *sig)
  {
  	guint i, res = sig->ret->type;
  
  	for (i = 0; i < sig->param_count; i++)
  		res = (res << 5) - res + mono_type_hash (sig->params[i]);
  
  	return res;
  }
  
  /*
   * mono_metadata_encode_value:
   * @value: value to encode
   * @buf: buffer where to write the compressed representation
   * @endbuf: pointer updated to point at the end of the encoded output
   *
   * Encodes the value @value in the compressed representation used
   * in metadata and stores the result in @buf. @buf needs to be big
   * enough to hold the data (4 bytes).
   */
  void
  mono_metadata_encode_value (guint32 value, char *buf, char **endbuf)
  {
  	char *p = buf;
  	
  	if (value < 0x80)
  		*p++ = value;
  	else if (value < 0x4000) {
  		p [0] = 0x80 | (value >> 8);
  		p [1] = value & 0xff;
  		p += 2;
  	} else {
  		p [0] = (value >> 24) | 0xc0;
  		p [1] = (value >> 16) & 0xff;
  		p [2] = (value >> 8) & 0xff;
  		p [3] = value & 0xff;
  		p += 4;
  	}
  	if (endbuf)
  		*endbuf = p;
  }
  
  /*
   * mono_metadata_field_info:
   * @meta: the Image the field is defined in
   * @index: the index in the field table representing the field
   * @offset: a pointer to an integer where to store the offset that 
   * may have been specified for the field in a FieldLayout table
   * @rva: a pointer to the RVA of the field data in the image that
   * may have been defined in a FieldRVA table
   * @marshal_spec: a pointer to the marshal spec that may have been 
   * defined for the field in a FieldMarshal table.
   *
   * Gather info for field @index that may have been defined in the FieldLayout, 
   * FieldRVA and FieldMarshal tables.
   * Either of offset, rva and marshal_spec can be NULL if you're not interested 
   * in the data.
   */
  void
  mono_metadata_field_info (MonoImage *meta, guint32 index, guint32 *offset, guint32 *rva, 
  			  MonoMarshalSpec **marshal_spec)
  {
  	mono_metadata_field_info_full (meta, index, offset, rva, marshal_spec, FALSE);
  }
  
  void
  mono_metadata_field_info_with_mempool (MonoImage *meta, guint32 index, guint32 *offset, guint32 *rva, 
  			  MonoMarshalSpec **marshal_spec)
  {
  	mono_metadata_field_info_full (meta, index, offset, rva, marshal_spec, TRUE);
  }
  
  static void
  mono_metadata_field_info_full (MonoImage *meta, guint32 index, guint32 *offset, guint32 *rva, 
  				       MonoMarshalSpec **marshal_spec, gboolean alloc_from_image)
  {
  	MonoTableInfo *tdef;
  	locator_t loc;
  
  	loc.idx = index + 1;
  	if (meta->uncompressed_metadata)
  		loc.idx = search_ptr_table (meta, MONO_TABLE_FIELD_POINTER, loc.idx);
  
  	if (offset) {
  		tdef = &meta->tables [MONO_TABLE_FIELDLAYOUT];
  
  		loc.col_idx = MONO_FIELD_LAYOUT_FIELD;
  		loc.t = tdef;
  
  		if (tdef->base && mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator)) {
  			*offset = mono_metadata_decode_row_col (tdef, loc.result, MONO_FIELD_LAYOUT_OFFSET);
  		} else {
  			*offset = (guint32)-1;
  		}
  	}
  	if (rva) {
  		tdef = &meta->tables [MONO_TABLE_FIELDRVA];
  
  		loc.col_idx = MONO_FIELD_RVA_FIELD;
  		loc.t = tdef;
  		
  		if (tdef->base && mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator)) {
  			/*
  			 * LAMESPEC: There is no signature, no nothing, just the raw data.
  			 */
  			*rva = mono_metadata_decode_row_col (tdef, loc.result, MONO_FIELD_RVA_RVA);
  		} else {
  			*rva = 0;
  		}
  	}
  	if (marshal_spec) {
  		const char *p;
  		
  		if ((p = mono_metadata_get_marshal_info (meta, index, TRUE))) {
  			*marshal_spec = mono_metadata_parse_marshal_spec_full (alloc_from_image ? meta : NULL, p);
  		}
  	}
  
  }
  
  /*
   * mono_metadata_get_constant_index:
   * @meta: the Image the field is defined in
   * @index: the token that may have a row defined in the constants table
   * @hint: possible position for the row
   *
   * @token must be a FieldDef, ParamDef or PropertyDef token.
   *
   * Returns: the index into the Constants table or 0 if not found.
   */
  guint32
  mono_metadata_get_constant_index (MonoImage *meta, guint32 token, guint32 hint)
  {
  	MonoTableInfo *tdef;
  	locator_t loc;
  	guint32 index = mono_metadata_token_index (token);
  
  	tdef = &meta->tables [MONO_TABLE_CONSTANT];
  	index <<= MONO_HASCONSTANT_BITS;
  	switch (mono_metadata_token_table (token)) {
  	case MONO_TABLE_FIELD:
  		index |= MONO_HASCONSTANT_FIEDDEF;
  		break;
  	case MONO_TABLE_PARAM:
  		index |= MONO_HASCONSTANT_PARAM;
  		break;
  	case MONO_TABLE_PROPERTY:
  		index |= MONO_HASCONSTANT_PROPERTY;
  		break;
  	default:
  		g_warning ("Not a valid token for the constant table: 0x%08x", token);
  		return 0;
  	}
  	loc.idx = index;
  	loc.col_idx = MONO_CONSTANT_PARENT;
  	loc.t = tdef;
  
  	/* FIXME: Index translation */
  
  	if ((hint > 0) && (hint < tdef->rows) && (mono_metadata_decode_row_col (tdef, hint - 1, MONO_CONSTANT_PARENT) == index))
  		return hint;
  
  	if (tdef->base && mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator)) {
  		return loc.result + 1;
  	}
  	return 0;
  }
  
  /*
   * mono_metadata_events_from_typedef:
   * @meta: metadata context
   * @index: 0-based index (in the TypeDef table) describing a type
   *
   * Returns: the 0-based index in the Event table for the events in the
   * type. The last event that belongs to the type (plus 1) is stored
   * in the @end_idx pointer.
   */
  guint32
  mono_metadata_events_from_typedef (MonoImage *meta, guint32 index, guint *end_idx)
  {
  	locator_t loc;
  	guint32 start, end;
  	MonoTableInfo *tdef  = &meta->tables [MONO_TABLE_EVENTMAP];
  
  	*end_idx = 0;
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.t = tdef;
  	loc.col_idx = MONO_EVENT_MAP_PARENT;
  	loc.idx = index + 1;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  	
  	start = mono_metadata_decode_row_col (tdef, loc.result, MONO_EVENT_MAP_EVENTLIST);
  	if (loc.result + 1 < tdef->rows) {
  		end = mono_metadata_decode_row_col (tdef, loc.result + 1, MONO_EVENT_MAP_EVENTLIST) - 1;
  	} else {
  		end = meta->tables [MONO_TABLE_EVENT].rows;
  	}
  
  	*end_idx = end;
  	return start - 1;
  }
  
  /*
   * mono_metadata_methods_from_event:
   * @meta: metadata context
   * @index: 0-based index (in the Event table) describing a event
   *
   * Returns: the 0-based index in the MethodDef table for the methods in the
   * event. The last method that belongs to the event (plus 1) is stored
   * in the @end_idx pointer.
   */
  guint32
  mono_metadata_methods_from_event   (MonoImage *meta, guint32 index, guint *end_idx)
  {
  	locator_t loc;
  	guint start, end;
  	guint32 cols [MONO_METHOD_SEMA_SIZE];
  	MonoTableInfo *msemt = &meta->tables [MONO_TABLE_METHODSEMANTICS];
  
  	*end_idx = 0;
  	if (!msemt->base)
  		return 0;
  
  	if (meta->uncompressed_metadata)
  	    index = search_ptr_table (meta, MONO_TABLE_EVENT_POINTER, index + 1) - 1;
  
  	loc.t = msemt;
  	loc.col_idx = MONO_METHOD_SEMA_ASSOCIATION;
  	loc.idx = ((index + 1) << MONO_HAS_SEMANTICS_BITS) | MONO_HAS_SEMANTICS_EVENT; /* Method association coded index */
  
  	if (!mono_binary_search (&loc, msemt->base, msemt->rows, msemt->row_size, table_locator))
  		return 0;
  
  	start = loc.result;
  	/*
  	 * We may end up in the middle of the rows... 
  	 */
  	while (start > 0) {
  		if (loc.idx == mono_metadata_decode_row_col (msemt, start - 1, MONO_METHOD_SEMA_ASSOCIATION))
  			start--;
  		else
  			break;
  	}
  	end = start + 1;
  	while (end < msemt->rows) {
  		mono_metadata_decode_row (msemt, end, cols, MONO_METHOD_SEMA_SIZE);
  		if (cols [MONO_METHOD_SEMA_ASSOCIATION] != loc.idx)
  			break;
  		++end;
  	}
  	*end_idx = end;
  	return start;
  }
  
  /*
   * mono_metadata_properties_from_typedef:
   * @meta: metadata context
   * @index: 0-based index (in the TypeDef table) describing a type
   *
   * Returns: the 0-based index in the Property table for the properties in the
   * type. The last property that belongs to the type (plus 1) is stored
   * in the @end_idx pointer.
   */
  guint32
  mono_metadata_properties_from_typedef (MonoImage *meta, guint32 index, guint *end_idx)
  {
  	locator_t loc;
  	guint32 start, end;
  	MonoTableInfo *tdef  = &meta->tables [MONO_TABLE_PROPERTYMAP];
  
  	*end_idx = 0;
  	
  	if (!tdef->base)
  		return 0;
  
  	loc.t = tdef;
  	loc.col_idx = MONO_PROPERTY_MAP_PARENT;
  	loc.idx = index + 1;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  	
  	start = mono_metadata_decode_row_col (tdef, loc.result, MONO_PROPERTY_MAP_PROPERTY_LIST);
  	if (loc.result + 1 < tdef->rows) {
  		end = mono_metadata_decode_row_col (tdef, loc.result + 1, MONO_PROPERTY_MAP_PROPERTY_LIST) - 1;
  	} else {
  		end = meta->tables [MONO_TABLE_PROPERTY].rows;
  	}
  
  	*end_idx = end;
  	return start - 1;
  }
  
  /*
   * mono_metadata_methods_from_property:
   * @meta: metadata context
   * @index: 0-based index (in the PropertyDef table) describing a property
   *
   * Returns: the 0-based index in the MethodDef table for the methods in the
   * property. The last method that belongs to the property (plus 1) is stored
   * in the @end_idx pointer.
   */
  guint32
  mono_metadata_methods_from_property   (MonoImage *meta, guint32 index, guint *end_idx)
  {
  	locator_t loc;
  	guint start, end;
  	guint32 cols [MONO_METHOD_SEMA_SIZE];
  	MonoTableInfo *msemt = &meta->tables [MONO_TABLE_METHODSEMANTICS];
  
  	*end_idx = 0;
  	if (!msemt->base)
  		return 0;
  
  	if (meta->uncompressed_metadata)
  	    index = search_ptr_table (meta, MONO_TABLE_PROPERTY_POINTER, index + 1) - 1;
  
  	loc.t = msemt;
  	loc.col_idx = MONO_METHOD_SEMA_ASSOCIATION;
  	loc.idx = ((index + 1) << MONO_HAS_SEMANTICS_BITS) | MONO_HAS_SEMANTICS_PROPERTY; /* Method association coded index */
  
  	if (!mono_binary_search (&loc, msemt->base, msemt->rows, msemt->row_size, table_locator))
  		return 0;
  
  	start = loc.result;
  	/*
  	 * We may end up in the middle of the rows... 
  	 */
  	while (start > 0) {
  		if (loc.idx == mono_metadata_decode_row_col (msemt, start - 1, MONO_METHOD_SEMA_ASSOCIATION))
  			start--;
  		else
  			break;
  	}
  	end = start + 1;
  	while (end < msemt->rows) {
  		mono_metadata_decode_row (msemt, end, cols, MONO_METHOD_SEMA_SIZE);
  		if (cols [MONO_METHOD_SEMA_ASSOCIATION] != loc.idx)
  			break;
  		++end;
  	}
  	*end_idx = end;
  	return start;
  }
  
  guint32
  mono_metadata_implmap_from_method (MonoImage *meta, guint32 method_idx)
  {
  	locator_t loc;
  	MonoTableInfo *tdef  = &meta->tables [MONO_TABLE_IMPLMAP];
  
  	if (!tdef->base)
  		return 0;
  
  	/* No index translation seems to be needed */
  
  	loc.t = tdef;
  	loc.col_idx = MONO_IMPLMAP_MEMBER;
  	loc.idx = ((method_idx + 1) << MONO_MEMBERFORWD_BITS) | MONO_MEMBERFORWD_METHODDEF;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  
  	return loc.result + 1;
  }
  
  /**
   * @image: context where the image is created
   * @type_spec:  typespec token
   *
   * Creates a MonoType representing the TypeSpec indexed by the @type_spec
   * token.
   */
  MonoType *
  mono_type_create_from_typespec (MonoImage *image, guint32 type_spec)
  {
  	guint32 idx = mono_metadata_token_index (type_spec);
  	MonoTableInfo *t;
  	guint32 cols [MONO_TYPESPEC_SIZE];
  	const char *ptr;
  	guint32 len;
  	MonoType *type, *type2;
  
  	mono_loader_lock ();
  
  	type = g_hash_table_lookup (image->typespec_cache, GUINT_TO_POINTER (type_spec));
  	if (type) {
  		mono_loader_unlock ();
  		return type;
  	}
  
  	t = &image->tables [MONO_TABLE_TYPESPEC];
  
  	mono_metadata_decode_row (t, idx-1, cols, MONO_TYPESPEC_SIZE);
  	ptr = mono_metadata_blob_heap (image, cols [MONO_TYPESPEC_SIGNATURE]);
  
  	if (!mono_verifier_verify_typespec_signature (image, cols [MONO_TYPESPEC_SIGNATURE], type_spec, NULL)) {
  		mono_loader_unlock ();
  		return NULL;
  	}
  
  	len = mono_metadata_decode_value (ptr, &ptr);
  
  	type = mono_metadata_parse_type_internal (image, NULL, MONO_PARSE_TYPE, 0, TRUE, ptr, &ptr);
  	if (!type) {
  		mono_loader_unlock ();
  		return NULL;
  	}
  
  	type2 = g_hash_table_lookup (image->typespec_cache, GUINT_TO_POINTER (type_spec));
  
  	if (type2) {
  		mono_loader_unlock ();
  		return type2;
  	}
  
  	type2 = mono_metadata_type_dup (image, type);
  	g_hash_table_insert (image->typespec_cache, GUINT_TO_POINTER (type_spec), type2);
  	mono_metadata_free_type (type);
  
  	mono_loader_unlock ();
  
  	return type2;
  }
  
  
  static char*
  mono_image_strndup (MonoImage *image, const char *data, guint len)
  {
  	char *res;
  	if (!image)
  		return g_strndup (data, len);
  	res = mono_image_alloc (image, len + 1);
  	memcpy (res, data, len);
  	res [len] = 0;
  	return res;
  }
  
  MonoMarshalSpec *
  mono_metadata_parse_marshal_spec (MonoImage *image, const char *ptr)
  {
  	return mono_metadata_parse_marshal_spec_full (NULL, ptr);
  }
  
  MonoMarshalSpec *
  mono_metadata_parse_marshal_spec_full (MonoImage *image, const char *ptr)
  {
  	MonoMarshalSpec *res;
  	int len;
  	const char *start = ptr;
  
  	/* fixme: this is incomplete, but I cant find more infos in the specs */
  
  	if (image)
  		res = mono_image_alloc0 (image, sizeof (MonoMarshalSpec));
  	else
  		res = g_new0 (MonoMarshalSpec, 1);
  	
  	len = mono_metadata_decode_value (ptr, &ptr);
  	res->native = *ptr++;
  
  	if (res->native == MONO_NATIVE_LPARRAY) {
  		res->data.array_data.param_num = -1;
  		res->data.array_data.num_elem = -1;
  		res->data.array_data.elem_mult = -1;
  
  		if (ptr - start <= len)
  			res->data.array_data.elem_type = *ptr++;
  		if (ptr - start <= len)
  			res->data.array_data.param_num = mono_metadata_decode_value (ptr, &ptr);
  		if (ptr - start <= len)
  			res->data.array_data.num_elem = mono_metadata_decode_value (ptr, &ptr);
  		if (ptr - start <= len) {
  			/*
  			 * LAMESPEC: Older spec versions say this parameter comes before 
  			 * num_elem. Never spec versions don't talk about elem_mult at
  			 * all, but csc still emits it, and it is used to distinguish
  			 * between param_num being 0, and param_num being omitted.
  			 * So if (param_num == 0) && (num_elem > 0), then
  			 * elem_mult == 0 -> the array size is num_elem
  			 * elem_mult == 1 -> the array size is @param_num + num_elem
  			 */
  			res->data.array_data.elem_mult = mono_metadata_decode_value (ptr, &ptr);
  		}
  	} 
  
  	if (res->native == MONO_NATIVE_BYVALTSTR) {
  		if (ptr - start <= len)
  			res->data.array_data.num_elem = mono_metadata_decode_value (ptr, &ptr);
  	}
  
  	if (res->native == MONO_NATIVE_BYVALARRAY) {
  		if (ptr - start <= len)
  			res->data.array_data.num_elem = mono_metadata_decode_value (ptr, &ptr);
  	}
  	
  	if (res->native == MONO_NATIVE_CUSTOM) {
  		/* skip unused type guid */
  		len = mono_metadata_decode_value (ptr, &ptr);
  		ptr += len;
  		/* skip unused native type name */
  		len = mono_metadata_decode_value (ptr, &ptr);
  		ptr += len;
  		/* read custom marshaler type name */
  		len = mono_metadata_decode_value (ptr, &ptr);
  		res->data.custom_data.custom_name = mono_image_strndup (image, ptr, len);		
  		ptr += len;
  		/* read cookie string */
  		len = mono_metadata_decode_value (ptr, &ptr);
  		res->data.custom_data.cookie = mono_image_strndup (image, ptr, len);
  	}
  
  	if (res->native == MONO_NATIVE_SAFEARRAY) {
  		res->data.safearray_data.elem_type = 0;
  		res->data.safearray_data.num_elem = 0;
  		if (ptr - start <= len)
  			res->data.safearray_data.elem_type = *ptr++;
  		if (ptr - start <= len)
  			res->data.safearray_data.num_elem = *ptr++;
  	}
  	return res;
  }
  
  void 
  mono_metadata_free_marshal_spec (MonoMarshalSpec *spec)
  {
  	if (spec->native == MONO_NATIVE_CUSTOM) {
  		g_free (spec->data.custom_data.custom_name);
  		g_free (spec->data.custom_data.cookie);
  	}
  	g_free (spec);
  }
  
  /**
   * mono_type_to_unmanaged:
   *
   * Returns: A MonoMarshalNative enumeration value (MONO_NATIVE_) value
   * describing the underlying native reprensetation of the type.
   * 
   * In addition the value pointed by
   * "conv" will contain the kind of marshalling required for this
   * particular type one of the MONO_MARSHAL_CONV_ enumeration values.
   */
  guint32
  mono_type_to_unmanaged (MonoType *type, MonoMarshalSpec *mspec, gboolean as_field,
  			gboolean unicode, MonoMarshalConv *conv) 
  {
  	MonoMarshalConv dummy_conv;
  	int t = type->type;
  
  	if (!conv)
  		conv = &dummy_conv;
  
  	*conv = MONO_MARSHAL_CONV_NONE;
  
  	if (type->byref)
  		return MONO_NATIVE_UINT;
  
  handle_enum:
  	switch (t) {
  	case MONO_TYPE_BOOLEAN: 
  		if (mspec) {
  			switch (mspec->native) {
  			case MONO_NATIVE_VARIANTBOOL:
  				*conv = MONO_MARSHAL_CONV_BOOL_VARIANTBOOL;
  				return MONO_NATIVE_VARIANTBOOL;
  			case MONO_NATIVE_BOOLEAN:
  				*conv = MONO_MARSHAL_CONV_BOOL_I4;
  				return MONO_NATIVE_BOOLEAN;
  			case MONO_NATIVE_I1:
  			case MONO_NATIVE_U1:
  				return mspec->native;
  			default:
  				g_error ("cant marshal bool to native type %02x", mspec->native);
  			}
  		}
  		*conv = MONO_MARSHAL_CONV_BOOL_I4;
  		return MONO_NATIVE_BOOLEAN;
  	case MONO_TYPE_CHAR:
  		if (mspec) {
  			switch (mspec->native) {
  			case MONO_NATIVE_U2:
  			case MONO_NATIVE_U1:
  				return mspec->native;
  			default:
  				g_error ("cant marshal char to native type %02x", mspec->native);
  			}
  		}
  		return unicode ? MONO_NATIVE_U2 : MONO_NATIVE_U1;
  	case MONO_TYPE_I1: return MONO_NATIVE_I1;
  	case MONO_TYPE_U1: return MONO_NATIVE_U1;
  	case MONO_TYPE_I2: return MONO_NATIVE_I2;
  	case MONO_TYPE_U2: return MONO_NATIVE_U2;
  	case MONO_TYPE_I4: return MONO_NATIVE_I4;
  	case MONO_TYPE_U4: return MONO_NATIVE_U4;
  	case MONO_TYPE_I8: return MONO_NATIVE_I8;
  	case MONO_TYPE_U8: return MONO_NATIVE_U8;
  	case MONO_TYPE_R4: return MONO_NATIVE_R4;
  	case MONO_TYPE_R8: return MONO_NATIVE_R8;
  	case MONO_TYPE_STRING:
  		if (mspec) {
  			switch (mspec->native) {
  			case MONO_NATIVE_BSTR:
  				*conv = MONO_MARSHAL_CONV_STR_BSTR;
  				return MONO_NATIVE_BSTR;
  			case MONO_NATIVE_LPSTR:
  				*conv = MONO_MARSHAL_CONV_STR_LPSTR;
  				return MONO_NATIVE_LPSTR;
  			case MONO_NATIVE_LPWSTR:
  				*conv = MONO_MARSHAL_CONV_STR_LPWSTR;
  				return MONO_NATIVE_LPWSTR;
  			case MONO_NATIVE_LPTSTR:
  				*conv = MONO_MARSHAL_CONV_STR_LPTSTR;
  				return MONO_NATIVE_LPTSTR;
  			case MONO_NATIVE_ANSIBSTR:
  				*conv = MONO_MARSHAL_CONV_STR_ANSIBSTR;
  				return MONO_NATIVE_ANSIBSTR;
  			case MONO_NATIVE_TBSTR:
  				*conv = MONO_MARSHAL_CONV_STR_TBSTR;
  				return MONO_NATIVE_TBSTR;
  			case MONO_NATIVE_BYVALTSTR:
  				if (unicode)
  					*conv = MONO_MARSHAL_CONV_STR_BYVALWSTR;
  				else
  					*conv = MONO_MARSHAL_CONV_STR_BYVALSTR;
  				return MONO_NATIVE_BYVALTSTR;
  			default:
  				g_error ("Can not marshal string to native type '%02x': Invalid managed/unmanaged type combination (String fields must be paired with LPStr, LPWStr, BStr or ByValTStr).", mspec->native);
  			}
  		} 	
  		if (unicode) {
  			*conv = MONO_MARSHAL_CONV_STR_LPWSTR;
  			return MONO_NATIVE_LPWSTR; 
  		}
  		else {
  			*conv = MONO_MARSHAL_CONV_STR_LPSTR;
  			return MONO_NATIVE_LPSTR; 
  		}
  	case MONO_TYPE_PTR: return MONO_NATIVE_UINT;
  	case MONO_TYPE_VALUETYPE: /*FIXME*/
  		if (type->data.klass->enumtype) {
  			t = mono_class_enum_basetype (type->data.klass)->type;
  			goto handle_enum;
  		}
  		if (type->data.klass == mono_defaults.handleref_class){
  			*conv = MONO_MARSHAL_CONV_HANDLEREF;
  			return MONO_NATIVE_INT;
  		}
  		return MONO_NATIVE_STRUCT;
  	case MONO_TYPE_SZARRAY: 
  	case MONO_TYPE_ARRAY: 
  		if (mspec) {
  			switch (mspec->native) {
  			case MONO_NATIVE_BYVALARRAY:
  				if ((type->data.klass->element_class == mono_defaults.char_class) && !unicode)
  					*conv = MONO_MARSHAL_CONV_ARRAY_BYVALCHARARRAY;
  				else
  					*conv = MONO_MARSHAL_CONV_ARRAY_BYVALARRAY;
  				return MONO_NATIVE_BYVALARRAY;
  			case MONO_NATIVE_SAFEARRAY:
  				*conv = MONO_MARSHAL_CONV_ARRAY_SAVEARRAY;
  				return MONO_NATIVE_SAFEARRAY;
  			case MONO_NATIVE_LPARRAY:				
  				*conv = MONO_MARSHAL_CONV_ARRAY_LPARRAY;
  				return MONO_NATIVE_LPARRAY;
  			default:
  				g_error ("cant marshal array as native type %02x", mspec->native);
  			}
  		} 	
  
  		*conv = MONO_MARSHAL_CONV_ARRAY_LPARRAY;
  		return MONO_NATIVE_LPARRAY;
  	case MONO_TYPE_I: return MONO_NATIVE_INT;
  	case MONO_TYPE_U: return MONO_NATIVE_UINT;
  	case MONO_TYPE_CLASS: 
  	case MONO_TYPE_OBJECT: {
  		/* FIXME : we need to handle ArrayList and StringBuilder here, probably */
  		if (mspec) {
  			switch (mspec->native) {
  			case MONO_NATIVE_STRUCT:
  				return MONO_NATIVE_STRUCT;
  			case MONO_NATIVE_CUSTOM:
  				return MONO_NATIVE_CUSTOM;
  			case MONO_NATIVE_INTERFACE:
  				*conv = MONO_MARSHAL_CONV_OBJECT_INTERFACE;
  				return MONO_NATIVE_INTERFACE;
  			case MONO_NATIVE_IDISPATCH:
  				*conv = MONO_MARSHAL_CONV_OBJECT_IDISPATCH;
  				return MONO_NATIVE_IDISPATCH;
  			case MONO_NATIVE_IUNKNOWN:
  				*conv = MONO_MARSHAL_CONV_OBJECT_IUNKNOWN;
  				return MONO_NATIVE_IUNKNOWN;
  			case MONO_NATIVE_FUNC:
  				if (t == MONO_TYPE_CLASS && (type->data.klass == mono_defaults.multicastdelegate_class ||
  											 type->data.klass == mono_defaults.delegate_class || 
  											 type->data.klass->parent == mono_defaults.multicastdelegate_class)) {
  					*conv = MONO_MARSHAL_CONV_DEL_FTN;
  					return MONO_NATIVE_FUNC;
  				}
  				/* Fall through */
  			default:
  				g_error ("cant marshal object as native type %02x", mspec->native);
  			}
  		}
  		if (t == MONO_TYPE_CLASS && (type->data.klass == mono_defaults.multicastdelegate_class ||
  					     type->data.klass == mono_defaults.delegate_class || 
  					     type->data.klass->parent == mono_defaults.multicastdelegate_class)) {
  			*conv = MONO_MARSHAL_CONV_DEL_FTN;
  			return MONO_NATIVE_FUNC;
  		}
  		if (mono_defaults.safehandle_class && type->data.klass == mono_defaults.safehandle_class){
  			*conv = MONO_MARSHAL_CONV_SAFEHANDLE;
  			return MONO_NATIVE_INT;
  		}
  		*conv = MONO_MARSHAL_CONV_OBJECT_STRUCT;
  		return MONO_NATIVE_STRUCT;
  	}
  	case MONO_TYPE_FNPTR: return MONO_NATIVE_FUNC;
  	case MONO_TYPE_GENERICINST:
  		type = &type->data.generic_class->container_class->byval_arg;
  		t = type->type;
  		goto handle_enum;
  	case MONO_TYPE_TYPEDBYREF:
  	default:
  		g_error ("type 0x%02x not handled in marshal", t);
  	}
  	return MONO_NATIVE_MAX;
  }
  
  const char*
  mono_metadata_get_marshal_info (MonoImage *meta, guint32 idx, gboolean is_field)
  {
  	locator_t loc;
  	MonoTableInfo *tdef  = &meta->tables [MONO_TABLE_FIELDMARSHAL];
  
  	if (!tdef->base)
  		return NULL;
  
  	loc.t = tdef;
  	loc.col_idx = MONO_FIELD_MARSHAL_PARENT;
  	loc.idx = ((idx + 1) << MONO_HAS_FIELD_MARSHAL_BITS) | (is_field? MONO_HAS_FIELD_MARSHAL_FIELDSREF: MONO_HAS_FIELD_MARSHAL_PARAMDEF);
  
  	/* FIXME: Index translation */
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return NULL;
  
  	return mono_metadata_blob_heap (meta, mono_metadata_decode_row_col (tdef, loc.result, MONO_FIELD_MARSHAL_NATIVE_TYPE));
  }
  
  MonoMethod*
  method_from_method_def_or_ref (MonoImage *m, guint32 tok, MonoGenericContext *context)
  {
  	guint32 idx = tok >> MONO_METHODDEFORREF_BITS;
  
  	switch (tok & MONO_METHODDEFORREF_MASK) {
  	case MONO_METHODDEFORREF_METHODDEF:
  		return mono_get_method_full (m, MONO_TOKEN_METHOD_DEF | idx, NULL, context);
  	case MONO_METHODDEFORREF_METHODREF:
  		return mono_get_method_full (m, MONO_TOKEN_MEMBER_REF | idx, NULL, context);
  	}
  	g_assert_not_reached ();
  	return NULL;
  }
  
  /*
   * mono_class_get_overrides_full:
   *
   *   Return the method overrides belonging to class @type_token in @overrides, and
   * the number of overrides in @num_overrides.
   *
   * Returns: TRUE on success, FALSE on failure.
   */
  gboolean
  mono_class_get_overrides_full (MonoImage *image, guint32 type_token, MonoMethod ***overrides, gint32 *num_overrides,
  			       MonoGenericContext *generic_context)
  {
  	MonoError error;
  	locator_t loc;
  	MonoTableInfo *tdef  = &image->tables [MONO_TABLE_METHODIMPL];
  	guint32 start, end;
  	gint32 i, num;
  	guint32 cols [MONO_METHODIMPL_SIZE];
  	MonoMethod **result;
  	gint32 ok = TRUE;
  	
  	*overrides = NULL;
  	if (num_overrides)
  		*num_overrides = 0;
  
  	if (!tdef->base)
  		return TRUE;
  
  	loc.t = tdef;
  	loc.col_idx = MONO_METHODIMPL_CLASS;
  	loc.idx = mono_metadata_token_index (type_token);
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return TRUE;
  
  	start = loc.result;
  	end = start + 1;
  	/*
  	 * We may end up in the middle of the rows... 
  	 */
  	while (start > 0) {
  		if (loc.idx == mono_metadata_decode_row_col (tdef, start - 1, MONO_METHODIMPL_CLASS))
  			start--;
  		else
  			break;
  	}
  	while (end < tdef->rows) {
  		if (loc.idx == mono_metadata_decode_row_col (tdef, end, MONO_METHODIMPL_CLASS))
  			end++;
  		else
  			break;
  	}
  	num = end - start;
  	result = g_new (MonoMethod*, num * 2);
  	for (i = 0; i < num; ++i) {
  		MonoMethod *method;
  
  		if (!mono_verifier_verify_methodimpl_row (image, start + i, &error)) {
  			mono_error_cleanup (&error);
  			ok = FALSE;
  			break;
  		}
  
  		mono_metadata_decode_row (tdef, start + i, cols, MONO_METHODIMPL_SIZE);
  		method = method_from_method_def_or_ref (
  			image, cols [MONO_METHODIMPL_DECLARATION], generic_context);
  		if (method == NULL)
  			ok = FALSE;
  		result [i * 2] = method;
  		method = method_from_method_def_or_ref (
  			image, cols [MONO_METHODIMPL_BODY], generic_context);
  		if (method == NULL)
  			ok = FALSE;
  		result [i * 2 + 1] = method;
  	}
  
  	*overrides = result;
  	if (num_overrides)
  		*num_overrides = num;
  	return ok;
  }
  
  /**
   * mono_guid_to_string:
   *
   * Converts a 16 byte Microsoft GUID to the standard string representation.
   */
  char *
  mono_guid_to_string (const guint8 *guid)
  {
  	return g_strdup_printf ("%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", 
  				guid[3], guid[2], guid[1], guid[0],
  				guid[5], guid[4],
  				guid[7], guid[6],
  				guid[8], guid[9],
  				guid[10], guid[11], guid[12], guid[13], guid[14], guid[15]);
  }
  
  static gboolean
  get_constraints (MonoImage *image, int owner, MonoClass ***constraints, MonoGenericContainer *container)
  {
  	MonoTableInfo *tdef  = &image->tables [MONO_TABLE_GENERICPARAMCONSTRAINT];
  	guint32 cols [MONO_GENPARCONSTRAINT_SIZE];
  	guint32 i, token, found;
  	MonoClass *klass, **res;
  	GSList *cons = NULL, *tmp;
  	MonoGenericContext *context = &container->context;
  
  	*constraints = NULL;
  	found = 0;
  	for (i = 0; i < tdef->rows; ++i) {
  		mono_metadata_decode_row (tdef, i, cols, MONO_GENPARCONSTRAINT_SIZE);
  		if (cols [MONO_GENPARCONSTRAINT_GENERICPAR] == owner) {
  			token = mono_metadata_token_from_dor (cols [MONO_GENPARCONSTRAINT_CONSTRAINT]);
  			klass = mono_class_get_full (image, token, context);
  			if (!klass) {
  				g_slist_free (cons);
  				return FALSE;
  			}
  			cons = g_slist_append (cons, klass);
  			++found;
  		} else {
  			/* contiguous list finished */
  			if (found)
  				break;
  		}
  	}
  	if (!found)
  		return TRUE;
  	res = mono_image_alloc0 (image, sizeof (MonoClass*) * (found + 1));
  	for (i = 0, tmp = cons; i < found; ++i, tmp = tmp->next) {
  		res [i] = tmp->data;
  	}
  	g_slist_free (cons);
  	*constraints = res;
  	return TRUE;
  }
  
  /*
   * mono_metadata_get_generic_param_row:
   *
   * @image:
   * @token: TypeOrMethodDef token, owner for GenericParam
   * @owner: coded token, set on return
   * 
   * Returns: 1-based row-id in the GenericParam table whose
   * owner is @token. 0 if not found.
   */
  guint32
  mono_metadata_get_generic_param_row (MonoImage *image, guint32 token, guint32 *owner)
  {
  	MonoTableInfo *tdef  = &image->tables [MONO_TABLE_GENERICPARAM];
  	locator_t loc;
  
  	g_assert (owner);
  	if (!tdef->base)
  		return 0;
  
  	if (mono_metadata_token_table (token) == MONO_TABLE_TYPEDEF)
  		*owner = MONO_TYPEORMETHOD_TYPE;
  	else if (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
  		*owner = MONO_TYPEORMETHOD_METHOD;
  	else {
  		g_error ("wrong token %x to get_generic_param_row", token);
  		return 0;
  	}
  	*owner |= mono_metadata_token_index (token) << MONO_TYPEORMETHOD_BITS;
  
  	loc.idx = *owner;
  	loc.col_idx = MONO_GENERICPARAM_OWNER;
  	loc.t = tdef;
  
  	if (!mono_binary_search (&loc, tdef->base, tdef->rows, tdef->row_size, table_locator))
  		return 0;
  
  	/* Find the first entry by searching backwards */
  	while ((loc.result > 0) && (mono_metadata_decode_row_col (tdef, loc.result - 1, MONO_GENERICPARAM_OWNER) == loc.idx))
  		loc.result --;
  
  	return loc.result + 1;
  }
  
  gboolean
  mono_metadata_has_generic_params (MonoImage *image, guint32 token)
  {
  	guint32 owner;
  	return mono_metadata_get_generic_param_row (image, token, &owner);
  }
  
  /*
   * Memory is allocated from IMAGE's mempool.
   */
  gboolean
  mono_metadata_load_generic_param_constraints_full (MonoImage *image, guint32 token,
  					      MonoGenericContainer *container)
  {
  
  	guint32 start_row, i, owner;
  	if (! (start_row = mono_metadata_get_generic_param_row (image, token, &owner)))
  		return TRUE;
  	for (i = 0; i < container->type_argc; i++) {
  		if (!get_constraints (image, start_row + i, &mono_generic_container_get_param_info (container, i)->constraints, container))
  			return FALSE;
  	}
  	return TRUE;
  }
  
  /*
   * mono_metadata_load_generic_param_constraints:
   *
   * @image: metadata context
   * @token: metadata token to load the contraints, can be methodef or typedef.
   * @container: generic container to load into.
   *
   * Load the generic parameter constraints for the newly created generic type or method
   * represented by @token and @container.  The @container is the new container which has
   * been returned by a call to mono_metadata_load_generic_params() with this @token.
   * Memory is allocated from IMAGE's mempool.
   */
  void
  mono_metadata_load_generic_param_constraints (MonoImage *image, guint32 token,
  					      MonoGenericContainer *container)
  {
  	mono_metadata_load_generic_param_constraints_full (image, token, container);
  	/*FIXME this function can potentially exit with a pending loader error and cause all sort of havok */
  }
  
  /*
   * mono_metadata_load_generic_params:
   *
   * Load the type parameters from the type or method definition @token.
   *
   * Use this method after parsing a type or method definition to figure out whether it's a generic
   * type / method.  When parsing a method definition, @parent_container points to the generic container
   * of the current class, if any.
   *
   * Note: This method does not load the constraints: for typedefs, this has to be done after fully
   *       creating the type.
   *
   * Returns: NULL if @token is not a generic type or method definition or the new generic container.
   *
   * LOCKING: Acquires the loader lock
   *
   */
  MonoGenericContainer *
  mono_metadata_load_generic_params (MonoImage *image, guint32 token, MonoGenericContainer *parent_container)
  {
  	MonoTableInfo *tdef  = &image->tables [MONO_TABLE_GENERICPARAM];
  	guint32 cols [MONO_GENERICPARAM_SIZE];
  	guint32 i, owner = 0, n;
  	MonoGenericContainer *container;
  	MonoGenericParamFull *params;
  	MonoGenericContext *context;
  
  	if (!(i = mono_metadata_get_generic_param_row (image, token, &owner)))
  		return NULL;
  	mono_metadata_decode_row (tdef, i - 1, cols, MONO_GENERICPARAM_SIZE);
  	params = NULL;
  	n = 0;
  	container = mono_image_alloc0 (image, sizeof (MonoGenericContainer));
  	container->image = image;
  	do {
  		n++;
  		params = g_realloc (params, sizeof (MonoGenericParamFull) * n);
  		memset (&params [n - 1], 0, sizeof (MonoGenericParamFull));
  		params [n - 1].param.owner = container;
  		params [n - 1].param.num = cols [MONO_GENERICPARAM_NUMBER];
  		params [n - 1].info.token = i | MONO_TOKEN_GENERIC_PARAM;
  		params [n - 1].info.flags = cols [MONO_GENERICPARAM_FLAGS];
  		params [n - 1].info.name = mono_metadata_string_heap (image, cols [MONO_GENERICPARAM_NAME]);
  		if (params [n - 1].param.num != n - 1)
  			g_warning ("GenericParam table unsorted or hole in generic param sequence: token %d", i);
  		if (++i > tdef->rows)
  			break;
  		mono_metadata_decode_row (tdef, i - 1, cols, MONO_GENERICPARAM_SIZE);
  	} while (cols [MONO_GENERICPARAM_OWNER] == owner);
  
  	container->type_argc = n;
  	container->type_params = mono_image_alloc0 (image, sizeof (MonoGenericParamFull) * n);
  	memcpy (container->type_params, params, sizeof (MonoGenericParamFull) * n);
  	g_free (params);
  	container->parent = parent_container;
  
  	if (mono_metadata_token_table (token) == MONO_TABLE_METHOD)
  		container->is_method = 1;
  
  	g_assert (container->parent == NULL || container->is_method);
  
  	context = &container->context;
  	if (container->is_method) {
  		context->class_inst = container->parent ? container->parent->context.class_inst : NULL;
  		context->method_inst = mono_get_shared_generic_inst (container);
  	} else {
  		context->class_inst = mono_get_shared_generic_inst (container);
  	}
  
  	return container;
  }
  
  MonoGenericInst *
  mono_get_shared_generic_inst (MonoGenericContainer *container)
  {
  	MonoType **type_argv;
  	MonoType *helper;
  	MonoGenericInst *nginst;
  	int i;
  
  	type_argv = g_new0 (MonoType *, container->type_argc);
  	helper = g_new0 (MonoType, container->type_argc);
  
  	for (i = 0; i < container->type_argc; i++) {
  		MonoType *t = &helper [i];
  
  		t->type = container->is_method ? MONO_TYPE_MVAR : MONO_TYPE_VAR;
  		t->data.generic_param = mono_generic_container_get_param (container, i);
  
  		type_argv [i] = t;
  	}
  
  	nginst = mono_metadata_get_generic_inst (container->type_argc, type_argv);
  
  	g_free (type_argv);
  	g_free (helper);
  
  	return nginst;
  }
  
  /**
   * mono_type_is_byref:
   * @type: the MonoType operated on
   *
   * Returns: #TRUE if @type represents a type passed by reference,
   * #FALSE otherwise.
   */
  gboolean
  mono_type_is_byref (MonoType *type)
  {
  	return type->byref;
  }
  
  /**
   * mono_type_get_type:
   * @type: the MonoType operated on
   *
   * Returns: the IL type value for @type. This is one of the MonoTypeEnum
   * enum members like MONO_TYPE_I4 or MONO_TYPE_STRING.
   */
  int
  mono_type_get_type (MonoType *type)
  {
  	return type->type;
  }
  
  /**
   * mono_type_get_signature:
   * @type: the MonoType operated on
   *
   * It is only valid to call this function if @type is a MONO_TYPE_FNPTR.
   *
   * Returns: the MonoMethodSignature pointer that describes the signature
   * of the function pointer @type represents.
   */
  MonoMethodSignature*
  mono_type_get_signature (MonoType *type)
  {
  	g_assert (type->type == MONO_TYPE_FNPTR);
  	return type->data.method;
  }
  
  /**
   * mono_type_get_class:
   * @type: the MonoType operated on
   *
   * It is only valid to call this function if @type is a MONO_TYPE_CLASS or a
   * MONO_TYPE_VALUETYPE. For more general functionality, use mono_class_from_mono_type (),
   * instead
   *
   * Returns: the MonoClass pointer that describes the class that @type represents.
   */
  MonoClass*
  mono_type_get_class (MonoType *type)
  {
  	/* FIXME: review the runtime users before adding the assert here */
  	return type->data.klass;
  }
  
  /**
   * mono_type_get_array_type:
   * @type: the MonoType operated on
   *
   * It is only valid to call this function if @type is a MONO_TYPE_ARRAY.
   *
   * Returns: a MonoArrayType struct describing the array type that @type
   * represents. The info includes details such as rank, array element type
   * and the sizes and bounds of multidimensional arrays.
   */
  MonoArrayType*
  mono_type_get_array_type (MonoType *type)
  {
  	return type->data.array;
  }
  
  /**
   * mono_type_get_ptr_type:
   * @type: the MonoType operated on
   *
   * It is only valid to call this function if @type is a MONO_TYPE_PTR.
   * instead
   *
   * Returns: the MonoType pointer that describes the type that @type
   * represents a pointer to.
   */
  MonoType*
  mono_type_get_ptr_type (MonoType *type)
  {
  	g_assert (type->type == MONO_TYPE_PTR);
  	return type->data.type;
  }
  
  MonoClass*
  mono_type_get_modifiers (MonoType *type, gboolean *is_required, gpointer *iter)
  {
  	/* FIXME: implement */
  	return NULL;
  }
  
  /**
   * mono_type_is_struct:
   * @type: the MonoType operated on
   *
   * Returns: #TRUE is @type is a struct, that is a ValueType but not en enum
   * or a basic type like System.Int32. #FALSE otherwise.
   */
  mono_bool
  mono_type_is_struct (MonoType *type)
  {
  	return (!type->byref && ((type->type == MONO_TYPE_VALUETYPE &&
  		!type->data.klass->enumtype) || (type->type == MONO_TYPE_TYPEDBYREF) ||
  		((type->type == MONO_TYPE_GENERICINST) && 
  		mono_metadata_generic_class_is_valuetype (type->data.generic_class) &&
  		!type->data.generic_class->container_class->enumtype)));
  }
  
  /**
   * mono_type_is_void:
   * @type: the MonoType operated on
   *
   * Returns: #TRUE is @type is System.Void. #FALSE otherwise.
   */
  mono_bool
  mono_type_is_void (MonoType *type)
  {
  	return (type && (type->type == MONO_TYPE_VOID) && !type->byref);
  }
  
  /**
   * mono_type_is_pointer:
   * @type: the MonoType operated on
   *
   * Returns: #TRUE is @type is a managed or unmanaged pointer type. #FALSE otherwise.
   */
  mono_bool
  mono_type_is_pointer (MonoType *type)
  {
  	return (type && ((type->byref || (type->type == MONO_TYPE_I) || type->type == MONO_TYPE_STRING)
  		|| (type->type == MONO_TYPE_SZARRAY) || (type->type == MONO_TYPE_CLASS) ||
  		(type->type == MONO_TYPE_U) || (type->type == MONO_TYPE_OBJECT) ||
  		(type->type == MONO_TYPE_ARRAY) || (type->type == MONO_TYPE_PTR) ||
  		(type->type == MONO_TYPE_FNPTR)));
  }
  
  /**
   * mono_type_is_reference:
   * @type: the MonoType operated on
   *
   * Returns: #TRUE is @type represents an object reference . #FALSE otherwise.
   */
  mono_bool
  mono_type_is_reference (MonoType *type)
  {
  	return (type && (((type->type == MONO_TYPE_STRING) ||
  		(type->type == MONO_TYPE_SZARRAY) || (type->type == MONO_TYPE_CLASS) ||
  		(type->type == MONO_TYPE_OBJECT) || (type->type == MONO_TYPE_ARRAY)) ||
  		((type->type == MONO_TYPE_GENERICINST) &&
  		!mono_metadata_generic_class_is_valuetype (type->data.generic_class))));
  }
  
  /**
   * mono_signature_get_return_type:
   * @sig: the method signature inspected
   *
   * Returns: the return type of the method signature @sig
   */
  MonoType*
  mono_signature_get_return_type (MonoMethodSignature *sig)
  {
  	return sig->ret;
  }
  
  /**
   * mono_signature_get_params:
   * @sig: the method signature inspected
   * #iter: pointer to an iterator
   *
   * Iterates over the parameters for the method signature @sig.
   * A void* pointer must be initualized to #NULL to start the iteration
   * and it's address is passed to this function repeteadly until it returns
   * #NULL.
   *
   * Returns: the next parameter type of the method signature @sig,
   * #NULL when finished.
   */
  MonoType*
  mono_signature_get_params (MonoMethodSignature *sig, gpointer *iter)
  {
  	MonoType** type;
  	if (!iter)
  		return NULL;
  	if (!*iter) {
  		/* start from the first */
  		if (sig->param_count) {
  			*iter = &sig->params [0];
  			return sig->params [0];
  		} else {
  			/* no method */
  			return NULL;
  		}
  	}
  	type = *iter;
  	type++;
  	if (type < &sig->params [sig->param_count]) {
  		*iter = type;
  		return *type;
  	}
  	return NULL;
  }
  
  /**
   * mono_signature_get_param_count:
   * @sig: the method signature inspected
   *
   * Returns: the number of parameters in the method signature @sig.
   */
  guint32
  mono_signature_get_param_count (MonoMethodSignature *sig)
  {
  	return sig->param_count;
  }
  
  /**
   * mono_signature_get_call_conv:
   * @sig: the method signature inspected
   *
   * Returns: the call convention of the method signature @sig.
   */
  guint32
  mono_signature_get_call_conv (MonoMethodSignature *sig)
  {
  	return sig->call_convention;
  }
  
  /**
   * mono_signature_vararg_start:
   * @sig: the method signature inspected
   *
   * Returns: the number of the first vararg parameter in the
   * method signature @sig. -1 if this is not a vararg signature.
   */
  int
  mono_signature_vararg_start (MonoMethodSignature *sig)
  {
  	return sig->sentinelpos;
  }
  
  /**
   * mono_signature_is_instance:
   * @sig: the method signature inspected
   *
   * Returns: #TRUE if this the method signature @sig has an implicit
   * first instance argument. #FALSE otherwise.
   */
  gboolean
  mono_signature_is_instance (MonoMethodSignature *sig)
  {
  	return sig->hasthis;
  }
  
  /**
   * mono_signature_param_is_out
   * @sig: the method signature inspected
   * @param_num: the 0-based index of the inspected parameter
   * 
   * Returns: #TRUE if the parameter is an out parameter, #FALSE
   * otherwise.
   */
  mono_bool
  mono_signature_param_is_out (MonoMethodSignature *sig, int param_num)
  {
  	g_assert (param_num >= 0 && param_num < sig->param_count);
  	return (sig->params [param_num]->attrs & PARAM_ATTRIBUTE_OUT) != 0;
  }
  
  /**
   * mono_signature_explicit_this:
   * @sig: the method signature inspected
   *
   * Returns: #TRUE if this the method signature @sig has an explicit
   * instance argument. #FALSE otherwise.
   */
  gboolean
  mono_signature_explicit_this (MonoMethodSignature *sig)
  {
  	return sig->explicit_this;
  }
  
  /* for use with allocated memory blocks (assumes alignment is to 8 bytes) */
  guint
  mono_aligned_addr_hash (gconstpointer ptr)
  {
  	return GPOINTER_TO_UINT (ptr) >> 3;
  }
  
  /*
   * If @field belongs to an inflated generic class, return the corresponding field of the
   * generic type definition class.
   */
  MonoClassField*
  mono_metadata_get_corresponding_field_from_generic_type_definition (MonoClassField *field)
  {
  	MonoClass *gtd;
  	int offset;
  
  	if (!field->parent->generic_class)
  		return field;
  
  	gtd = field->parent->generic_class->container_class;
  	offset = field - field->parent->fields;
  	return gtd->fields + offset;
  }
  
  /*
   * If @event belongs to an inflated generic class, return the corresponding event of the
   * generic type definition class.
   */
  MonoEvent*
  mono_metadata_get_corresponding_event_from_generic_type_definition (MonoEvent *event)
  {
  	MonoClass *gtd;
  	int offset;
  
  	if (!event->parent->generic_class)
  		return event;
  
  	gtd = event->parent->generic_class->container_class;
  	offset = event - event->parent->ext->events;
  	return gtd->ext->events + offset;
  }
  
  /*
   * If @property belongs to an inflated generic class, return the corresponding property of the
   * generic type definition class.
   */
  MonoProperty*
  mono_metadata_get_corresponding_property_from_generic_type_definition (MonoProperty *property)
  {
  	MonoClass *gtd;
  	int offset;
  
  	if (!property->parent->generic_class)
  		return property;
  
  	gtd = property->parent->generic_class->container_class;
  	offset = property - property->parent->ext->properties;
  	return gtd->ext->properties + offset;
  }
  
  