text: /*
   * This file is part of the Micro Python project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013, 2014 Damien P. George
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  #ifndef __MICROPY_INCLUDED_PY_MPCONFIG_H__
  #define __MICROPY_INCLUDED_PY_MPCONFIG_H__
  
  // This file contains default configuration settings for MicroPython.
  // You can override any of the options below using mpconfigport.h file
  // located in a directory of your port.
  
  // mpconfigport.h is a file containing configuration settings for a
  // particular port. mpconfigport.h is actually a default name for
  // such config, and it can be overriden using MP_CONFIGFILE preprocessor
  // define (you can do that by passing CFLAGS_EXTRA='-DMP_CONFIGFILE="<file.h>"'
  // argument to make when using standard MicroPython makefiles).
  // This is useful to have more than one config per port, for example,
  // release vs debug configs, etc. Note that if you switch from one config
  // to another, you must rebuild from scratch using "-B" switch to make.
  
  #ifdef MP_CONFIGFILE
  #include MP_CONFIGFILE
  #else
  #include <mpconfigport.h>
  #endif
  
  // Any options not explicitly set in mpconfigport.h will get default
  // values below.
  
  /*****************************************************************************/
  /* Object representation                                                     */
  
  // A Micro Python object is a machine word having the following form:
  //  - xxxx...xxx1 : a small int, bits 1 and above are the value
  //  - xxxx...xx10 : a qstr, bits 2 and above are the value
  //  - xxxx...xx00 : a pointer to an mp_obj_base_t (unless a fake object)
  #define MICROPY_OBJ_REPR_A (0)
  
  // A Micro Python object is a machine word having the following form:
  //  - xxxx...xx01 : a small int, bits 2 and above are the value
  //  - xxxx...xx11 : a qstr, bits 2 and above are the value
  //  - xxxx...xxx0 : a pointer to an mp_obj_base_t (unless a fake object)
  #define MICROPY_OBJ_REPR_B (1)
  
  // A MicroPython object is a machine word having the following form (called R):
  //  - iiiiiiii iiiiiiii iiiiiiii iiiiiii1 small int with 31-bit signed value
  //  - 01111111 1qqqqqqq qqqqqqqq qqqqq110 str with 20-bit qstr value
  //  - s1111111 10000000 00000000 00000010 +/- inf
  //  - s1111111 1xxxxxxx xxxxxxxx xxxxx010 nan, x != 0
  //  - seeeeeee efffffff ffffffff ffffff10 30-bit fp, e != 0xff
  //  - pppppppp pppppppp pppppppp pppppp00 ptr (4 byte alignment)
  // Str and float stored as O = R + 0x80800000, retrieved as R = O - 0x80800000.
  // This makes strs easier to encode/decode as they have zeros in the top 9 bits.
  // This scheme only works with 32-bit word size and float enabled.
  
  #define MICROPY_OBJ_REPR_C (2)
  
  // A MicroPython object is a 64-bit word having the following form (called R):
  //  - seeeeeee eeeeffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff 64-bit fp, e != 0x7ff
  //  - s1111111 11110000 00000000 00000000 00000000 00000000 00000000 00000000 +/- inf
  //  - 01111111 11111000 00000000 00000000 00000000 00000000 00000000 00000000 normalised nan
  //  - 01111111 11111101 00000000 00000000 iiiiiiii iiiiiiii iiiiiiii iiiiiii1 small int
  //  - 01111111 11111110 00000000 00000000 qqqqqqqq qqqqqqqq qqqqqqqq qqqqqqq1 str
  //  - 01111111 11111100 00000000 00000000 pppppppp pppppppp pppppppp pppppp00 ptr (4 byte alignment)
  // Stored as O = R + 0x8004000000000000, retrieved as R = O - 0x8004000000000000.
  // This makes pointers have all zeros in the top 32 bits.
  // Small-ints and strs have 1 as LSB to make sure they don't look like pointers
  // to the garbage collector.
  #define MICROPY_OBJ_REPR_D (3)
  
  #ifndef MICROPY_OBJ_REPR
  #define MICROPY_OBJ_REPR (MICROPY_OBJ_REPR_A)
  #endif
  
  /*****************************************************************************/
  /* Memory allocation policy                                                  */
  
  // Number of bytes in memory allocation/GC block. Any size allocated will be
  // rounded up to be multiples of this.
  #ifndef MICROPY_BYTES_PER_GC_BLOCK
  #define MICROPY_BYTES_PER_GC_BLOCK (4 * BYTES_PER_WORD)
  #endif
  
  // Number of words allocated (in BSS) to the GC stack (minimum is 1)
  #ifndef MICROPY_ALLOC_GC_STACK_SIZE
  #define MICROPY_ALLOC_GC_STACK_SIZE (64)
  #endif
  
  // Number of bytes to allocate initially when creating new chunks to store
  // interned string data.  Smaller numbers lead to more chunks being needed
  // and more wastage at the end of the chunk.  Larger numbers lead to wasted
  // space at the end when no more strings need interning.
  #ifndef MICROPY_ALLOC_QSTR_CHUNK_INIT
  #define MICROPY_ALLOC_QSTR_CHUNK_INIT (128)
  #endif
  
  // Initial amount for lexer indentation level
  #ifndef MICROPY_ALLOC_LEXER_INDENT_INIT
  #define MICROPY_ALLOC_LEXER_INDENT_INIT (10)
  #endif
  
  // Increment for lexer indentation level
  #ifndef MICROPY_ALLOC_LEXEL_INDENT_INC
  #define MICROPY_ALLOC_LEXEL_INDENT_INC (8)
  #endif
  
  // Initial amount for parse rule stack
  #ifndef MICROPY_ALLOC_PARSE_RULE_INIT
  #define MICROPY_ALLOC_PARSE_RULE_INIT (64)
  #endif
  
  // Increment for parse rule stack
  #ifndef MICROPY_ALLOC_PARSE_RULE_INC
  #define MICROPY_ALLOC_PARSE_RULE_INC (16)
  #endif
  
  // Initial amount for parse result stack
  #ifndef MICROPY_ALLOC_PARSE_RESULT_INIT
  #define MICROPY_ALLOC_PARSE_RESULT_INIT (32)
  #endif
  
  // Increment for parse result stack
  #ifndef MICROPY_ALLOC_PARSE_RESULT_INC
  #define MICROPY_ALLOC_PARSE_RESULT_INC (16)
  #endif
  
  // Strings this length or less will be interned by the parser
  #ifndef MICROPY_ALLOC_PARSE_INTERN_STRING_LEN
  #define MICROPY_ALLOC_PARSE_INTERN_STRING_LEN (10)
  #endif
  
  // Number of bytes to allocate initially when creating new chunks to store
  // parse nodes.  Small leads to fragmentation, large leads to excess use.
  #ifndef MICROPY_ALLOC_PARSE_CHUNK_INIT
  #define MICROPY_ALLOC_PARSE_CHUNK_INIT (128)
  #endif
  
  // Initial amount for ids in a scope
  #ifndef MICROPY_ALLOC_SCOPE_ID_INIT
  #define MICROPY_ALLOC_SCOPE_ID_INIT (4)
  #endif
  
  // Increment for ids in a scope
  #ifndef MICROPY_ALLOC_SCOPE_ID_INC
  #define MICROPY_ALLOC_SCOPE_ID_INC (6)
  #endif
  
  // Maximum length of a path in the filesystem
  // So we can allocate a buffer on the stack for path manipulation in import
  #ifndef MICROPY_ALLOC_PATH_MAX
  #define MICROPY_ALLOC_PATH_MAX (512)
  #endif
  
  // Initial size of module dict
  #ifndef MICROPY_MODULE_DICT_SIZE
  #define MICROPY_MODULE_DICT_SIZE (1)
  #endif
  
  // Whether realloc/free should be passed allocated memory region size
  // You must enable this if MICROPY_MEM_STATS is enabled
  #ifndef MICROPY_MALLOC_USES_ALLOCATED_SIZE
  #define MICROPY_MALLOC_USES_ALLOCATED_SIZE (0)
  #endif
  
  // Number of bytes used to store qstr length
  // Dictates hard limit on maximum Python identifier length, but 1 byte
  // (limit of 255 bytes in an identifier) should be enough for everyone
  #ifndef MICROPY_QSTR_BYTES_IN_LEN
  #define MICROPY_QSTR_BYTES_IN_LEN (1)
  #endif
  
  // Number of bytes used to store qstr hash
  #ifndef MICROPY_QSTR_BYTES_IN_HASH
  #define MICROPY_QSTR_BYTES_IN_HASH (2)
  #endif
  
  // Avoid using C stack when making Python function calls. C stack still
  // may be used if there's no free heap.
  #ifndef MICROPY_STACKLESS
  #define MICROPY_STACKLESS (0)
  #endif
  
  // Never use C stack when making Python function calls. This may break
  // testsuite as will subtly change which exception is thrown in case
  // of too deep recursion and other similar cases.
  #ifndef MICROPY_STACKLESS_STRICT
  #define MICROPY_STACKLESS_STRICT (0)
  #endif
  
  // Don't use alloca calls. As alloca() is not part of ANSI C, this
  // workaround option is provided for compilers lacking this de-facto
  // standard function. The way it works is allocating from heap, and
  // relying on garbage collection to free it eventually. This is of
  // course much less optimal than real alloca().
  #if defined(MICROPY_NO_ALLOCA) && MICROPY_NO_ALLOCA
  #undef alloca
  #define alloca(x) m_malloc(x)
  #endif
  
  /*****************************************************************************/
  /* Micro Python emitters                                                     */
  
  // Whether to support loading of persistent code
  #ifndef MICROPY_PERSISTENT_CODE_LOAD
  #define MICROPY_PERSISTENT_CODE_LOAD (0)
  #endif
  
  // Whether to support saving of persistent code
  #ifndef MICROPY_PERSISTENT_CODE_SAVE
  #define MICROPY_PERSISTENT_CODE_SAVE (0)
  #endif
  
  // Whether generated code can persist independently of the VM/runtime instance
  // This is enabled automatically when needed by other features
  #ifndef MICROPY_PERSISTENT_CODE
  #define MICROPY_PERSISTENT_CODE (MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE || MICROPY_MODULE_FROZEN_MPY)
  #endif
  
  // Whether to emit x64 native code
  #ifndef MICROPY_EMIT_X64
  #define MICROPY_EMIT_X64 (0)
  #endif
  
  // Whether to emit x86 native code
  #ifndef MICROPY_EMIT_X86
  #define MICROPY_EMIT_X86 (0)
  #endif
  
  // Whether to emit thumb native code
  #ifndef MICROPY_EMIT_THUMB
  #define MICROPY_EMIT_THUMB (0)
  #endif
  
  // Whether to enable the thumb inline assembler
  #ifndef MICROPY_EMIT_INLINE_THUMB
  #define MICROPY_EMIT_INLINE_THUMB (0)
  #endif
  
  // Whether to enable ARMv7-M instruction support in the Thumb2 inline assembler
  #ifndef MICROPY_EMIT_INLINE_THUMB_ARMV7M
  #define MICROPY_EMIT_INLINE_THUMB_ARMV7M (1)
  #endif
  
  // Whether to enable float support in the Thumb2 inline assembler
  #ifndef MICROPY_EMIT_INLINE_THUMB_FLOAT
  #define MICROPY_EMIT_INLINE_THUMB_FLOAT (1)
  #endif
  
  // Whether to emit ARM native code
  #ifndef MICROPY_EMIT_ARM
  #define MICROPY_EMIT_ARM (0)
  #endif
  
  // Convenience definition for whether any native emitter is enabled
  #define MICROPY_EMIT_NATIVE (MICROPY_EMIT_X64 || MICROPY_EMIT_X86 || MICROPY_EMIT_THUMB || MICROPY_EMIT_ARM)
  
  /*****************************************************************************/
  /* Compiler configuration                                                    */
  
  // Whether to include the compiler
  #ifndef MICROPY_ENABLE_COMPILER
  #define MICROPY_ENABLE_COMPILER (1)
  #endif
  
  // Whether the compiler is dynamically configurable (ie at runtime)
  #ifndef MICROPY_DYNAMIC_COMPILER
  #define MICROPY_DYNAMIC_COMPILER (0)
  #endif
  
  // Configure dynamic compiler macros
  #if MICROPY_DYNAMIC_COMPILER
  #define MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE_DYNAMIC (mp_dynamic_compiler.opt_cache_map_lookup_in_bytecode)
  #define MICROPY_PY_BUILTINS_STR_UNICODE_DYNAMIC (mp_dynamic_compiler.py_builtins_str_unicode)
  #else
  #define MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE_DYNAMIC MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
  #define MICROPY_PY_BUILTINS_STR_UNICODE_DYNAMIC MICROPY_PY_BUILTINS_STR_UNICODE
  #endif
  
  // Whether to enable constant folding; eg 1+2 rewritten as 3
  #ifndef MICROPY_COMP_CONST_FOLDING
  #define MICROPY_COMP_CONST_FOLDING (1)
  #endif
  
  // Whether to enable lookup of constants in modules; eg module.CONST
  #ifndef MICROPY_COMP_MODULE_CONST
  #define MICROPY_COMP_MODULE_CONST (0)
  #endif
  
  // Whether to enable constant optimisation; id = const(value)
  #ifndef MICROPY_COMP_CONST
  #define MICROPY_COMP_CONST (1)
  #endif
  
  // Whether to enable optimisation of: a, b = c, d
  // Costs 124 bytes (Thumb2)
  #ifndef MICROPY_COMP_DOUBLE_TUPLE_ASSIGN
  #define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (1)
  #endif
  
  // Whether to enable optimisation of: a, b, c = d, e, f
  // Cost 156 bytes (Thumb2)
  #ifndef MICROPY_COMP_TRIPLE_TUPLE_ASSIGN
  #define MICROPY_COMP_TRIPLE_TUPLE_ASSIGN (0)
  #endif
  
  /*****************************************************************************/
  /* Internal debugging stuff                                                  */
  
  // Whether to collect memory allocation stats
  #ifndef MICROPY_MEM_STATS
  #define MICROPY_MEM_STATS (0)
  #endif
  
  // Whether to build functions that print debugging info:
  //   mp_lexer_show_token
  //   mp_bytecode_print
  //   mp_parse_node_print
  #ifndef MICROPY_DEBUG_PRINTERS
  #define MICROPY_DEBUG_PRINTERS (0)
  #endif
  
  /*****************************************************************************/
  /* Optimisations                                                             */
  
  // Whether to use computed gotos in the VM, or a switch
  // Computed gotos are roughly 10% faster, and increase VM code size by a little
  #ifndef MICROPY_OPT_COMPUTED_GOTO
  #define MICROPY_OPT_COMPUTED_GOTO (0)
  #endif
  
  // Whether to cache result of map lookups in LOAD_NAME, LOAD_GLOBAL, LOAD_ATTR,
  // STORE_ATTR bytecodes.  Uses 1 byte extra RAM for each of these opcodes and
  // uses a bit of extra code ROM, but greatly improves lookup speed.
  #ifndef MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE
  #define MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE (0)
  #endif
  
  // Whether to use fast versions of bitwise operations (and, or, xor) when the
  // arguments are both positive.  Increases Thumb2 code size by about 250 bytes.
  #ifndef MICROPY_OPT_MPZ_BITWISE
  #define MICROPY_OPT_MPZ_BITWISE (0)
  #endif
  
  /*****************************************************************************/
  /* Python internal features                                                  */
  
  // Hook for the VM at the start of the opcode loop (can contain variable
  // definitions usable by the other hook functions)
  #ifndef MICROPY_VM_HOOK_INIT
  #define MICROPY_VM_HOOK_INIT
  #endif
  
  // Hook for the VM during the opcode loop (but only after jump opcodes)
  #ifndef MICROPY_VM_HOOK_LOOP
  #define MICROPY_VM_HOOK_LOOP
  #endif
  
  // Hook for the VM just before return opcode is finished being interpreted
  #ifndef MICROPY_VM_HOOK_RETURN
  #define MICROPY_VM_HOOK_RETURN
  #endif
  
  // Whether to include the garbage collector
  #ifndef MICROPY_ENABLE_GC
  #define MICROPY_ENABLE_GC (0)
  #endif
  
  // Whether to enable finalisers in the garbage collector (ie call __del__)
  #ifndef MICROPY_ENABLE_FINALISER
  #define MICROPY_ENABLE_FINALISER (0)
  #endif
  
  // Whether to check C stack usage. C stack used for calling Python functions,
  // etc. Not checking means segfault on overflow.
  #ifndef MICROPY_STACK_CHECK
  #define MICROPY_STACK_CHECK (0)
  #endif
  
  // Whether to have an emergency exception buffer
  #ifndef MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
  #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (0)
  #endif
  #if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
  #   ifndef MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE
  #   define MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE (0)   // 0 - implies dynamic allocation
  #   endif
  #endif
  
  // Prefer to raise KeyboardInterrupt asynchronously (from signal or interrupt
  // handler) - if supported by a particular port.
  #ifndef MICROPY_ASYNC_KBD_INTR
  #define MICROPY_ASYNC_KBD_INTR (0)
  #endif
  
  // Whether to include REPL helper function
  #ifndef MICROPY_HELPER_REPL
  #define MICROPY_HELPER_REPL (0)
  #endif
  
  // Whether to include emacs-style readline behavior in REPL
  #ifndef MICROPY_REPL_EMACS_KEYS
  #define MICROPY_REPL_EMACS_KEYS (0)
  #endif
  
  // Whether to implement auto-indent in REPL
  #ifndef MICROPY_REPL_AUTO_INDENT
  #define MICROPY_REPL_AUTO_INDENT (0)
  #endif
  
  // Whether port requires event-driven REPL functions
  #ifndef MICROPY_REPL_EVENT_DRIVEN
  #define MICROPY_REPL_EVENT_DRIVEN (0)
  #endif
  
  // Whether to include lexer helper function for unix
  #ifndef MICROPY_HELPER_LEXER_UNIX
  #define MICROPY_HELPER_LEXER_UNIX (0)
  #endif
  
  // Long int implementation
  #define MICROPY_LONGINT_IMPL_NONE (0)
  #define MICROPY_LONGINT_IMPL_LONGLONG (1)
  #define MICROPY_LONGINT_IMPL_MPZ (2)
  
  #ifndef MICROPY_LONGINT_IMPL
  #define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_NONE)
  #endif
  
  #if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
  typedef long long mp_longint_impl_t;
  #endif
  
  // Whether to include information in the byte code to determine source
  // line number (increases RAM usage, but doesn't slow byte code execution)
  #ifndef MICROPY_ENABLE_SOURCE_LINE
  #define MICROPY_ENABLE_SOURCE_LINE (0)
  #endif
  
  // Whether to include doc strings (increases RAM usage)
  #ifndef MICROPY_ENABLE_DOC_STRING
  #define MICROPY_ENABLE_DOC_STRING (0)
  #endif
  
  // Exception messages are short static strings
  #define MICROPY_ERROR_REPORTING_TERSE    (1)
  // Exception messages provide basic error details
  #define MICROPY_ERROR_REPORTING_NORMAL   (2)
  // Exception messages provide full info, e.g. object names
  #define MICROPY_ERROR_REPORTING_DETAILED (3)
  
  #ifndef MICROPY_ERROR_REPORTING
  #define MICROPY_ERROR_REPORTING (MICROPY_ERROR_REPORTING_NORMAL)
  #endif
  
  // Whether issue warnings during compiling/execution
  #ifndef MICROPY_WARNINGS
  #define MICROPY_WARNINGS (0)
  #endif
  
  // Float and complex implementation
  #define MICROPY_FLOAT_IMPL_NONE (0)
  #define MICROPY_FLOAT_IMPL_FLOAT (1)
  #define MICROPY_FLOAT_IMPL_DOUBLE (2)
  
  #ifndef MICROPY_FLOAT_IMPL
  #define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_NONE)
  #endif
  
  #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
  #define MICROPY_PY_BUILTINS_FLOAT (1)
  #define MICROPY_FLOAT_C_FUN(fun) fun##f
  typedef float mp_float_t;
  #elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
  #define MICROPY_PY_BUILTINS_FLOAT (1)
  #define MICROPY_FLOAT_C_FUN(fun) fun
  typedef double mp_float_t;
  #else
  #define MICROPY_PY_BUILTINS_FLOAT (0)
  #endif
  
  #ifndef MICROPY_PY_BUILTINS_COMPLEX
  #define MICROPY_PY_BUILTINS_COMPLEX (MICROPY_PY_BUILTINS_FLOAT)
  #endif
  
  // Enable features which improve CPython compatibility
  // but may lead to more code size/memory usage.
  // TODO: Originally intended as generic category to not
  // add bunch of once-off options. May need refactoring later
  #ifndef MICROPY_CPYTHON_COMPAT
  #define MICROPY_CPYTHON_COMPAT (1)
  #endif
  
  // Whether POSIX-semantics non-blocking streams are supported
  #ifndef MICROPY_STREAMS_NON_BLOCK
  #define MICROPY_STREAMS_NON_BLOCK (0)
  #endif
  
  // Whether to call __init__ when importing builtin modules for the first time
  #ifndef MICROPY_MODULE_BUILTIN_INIT
  #define MICROPY_MODULE_BUILTIN_INIT (0)
  #endif
  
  // Whether module weak links are supported
  #ifndef MICROPY_MODULE_WEAK_LINKS
  #define MICROPY_MODULE_WEAK_LINKS (0)
  #endif
  
  // Whether frozen modules are supported in the form of strings
  #ifndef MICROPY_MODULE_FROZEN_STR
  #define MICROPY_MODULE_FROZEN_STR (0)
  #endif
  
  // Whether frozen modules are supported in the form of .mpy files
  #ifndef MICROPY_MODULE_FROZEN_MPY
  #define MICROPY_MODULE_FROZEN_MPY (0)
  #endif
  
  // Convenience macro for whether frozen modules are supported
  #ifndef MICROPY_MODULE_FROZEN
  #define MICROPY_MODULE_FROZEN (MICROPY_MODULE_FROZEN_STR || MICROPY_MODULE_FROZEN_MPY)
  #endif
  
  // Whether you can override builtins in the builtins module
  #ifndef MICROPY_CAN_OVERRIDE_BUILTINS
  #define MICROPY_CAN_OVERRIDE_BUILTINS (0)
  #endif
  
  // Whether to check that the "self" argument of a builtin method has the
  // correct type.  Such an explicit check is only needed if a builtin
  // method escapes to Python land without a first argument, eg
  // list.append([], 1).  Without this check such calls will have undefined
  // behaviour (usually segfault) if the first argument is the wrong type.
  #ifndef MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG
  #define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (1)
  #endif
  
  // Whether to use internally defined errno's (otherwise system provided ones)
  #ifndef MICROPY_USE_INTERNAL_ERRNO
  #define MICROPY_USE_INTERNAL_ERRNO (0)
  #endif
  
  // Support for user-space VFS mount (selected ports)
  #ifndef MICROPY_FSUSERMOUNT
  #define MICROPY_FSUSERMOUNT (0)
  #endif
  
  /*****************************************************************************/
  /* Fine control over Python builtins, classes, modules, etc                  */
  
  // Whether to implement attributes on functions
  #ifndef MICROPY_PY_FUNCTION_ATTRS
  #define MICROPY_PY_FUNCTION_ATTRS (0)
  #endif
  
  // Whether to support descriptors (__get__ and __set__)
  // This costs some code size and makes all load attrs and store attrs slow
  #ifndef MICROPY_PY_DESCRIPTORS
  #define MICROPY_PY_DESCRIPTORS (0)
  #endif
  
  // Support for async/await/async for/async with
  #ifndef MICROPY_PY_ASYNC_AWAIT
  #define MICROPY_PY_ASYNC_AWAIT (1)
  #endif
  
  // Whether str object is proper unicode
  #ifndef MICROPY_PY_BUILTINS_STR_UNICODE
  #define MICROPY_PY_BUILTINS_STR_UNICODE (0)
  #endif
  
  // Whether str.center() method provided
  #ifndef MICROPY_PY_BUILTINS_STR_CENTER
  #define MICROPY_PY_BUILTINS_STR_CENTER (0)
  #endif
  
  // Whether str.splitlines() method provided
  #ifndef MICROPY_PY_BUILTINS_STR_SPLITLINES
  #define MICROPY_PY_BUILTINS_STR_SPLITLINES (0)
  #endif
  
  // Whether to support bytearray object
  #ifndef MICROPY_PY_BUILTINS_BYTEARRAY
  #define MICROPY_PY_BUILTINS_BYTEARRAY (1)
  #endif
  
  // Whether to support memoryview object
  #ifndef MICROPY_PY_BUILTINS_MEMORYVIEW
  #define MICROPY_PY_BUILTINS_MEMORYVIEW (0)
  #endif
  
  // Whether to support set object
  #ifndef MICROPY_PY_BUILTINS_SET
  #define MICROPY_PY_BUILTINS_SET (1)
  #endif
  
  // Whether to support slice subscript operators and slice object
  #ifndef MICROPY_PY_BUILTINS_SLICE
  #define MICROPY_PY_BUILTINS_SLICE (1)
  #endif
  
  // Whether to support slice attribute read access,
  // i.e. slice.start, slice.stop, slice.step
  #ifndef MICROPY_PY_BUILTINS_SLICE_ATTRS
  #define MICROPY_PY_BUILTINS_SLICE_ATTRS (0)
  #endif
  
  // Whether to support frozenset object
  #ifndef MICROPY_PY_BUILTINS_FROZENSET
  #define MICROPY_PY_BUILTINS_FROZENSET (0)
  #endif
  
  // Whether to support property object
  #ifndef MICROPY_PY_BUILTINS_PROPERTY
  #define MICROPY_PY_BUILTINS_PROPERTY (1)
  #endif
  
  // Whether to implement the start/stop/step attributes (readback) on
  // the "range" builtin type. Rarely used, and costs ~60 bytes (x86).
  #ifndef MICROPY_PY_BUILTINS_RANGE_ATTRS
  #define MICROPY_PY_BUILTINS_RANGE_ATTRS (1)
  #endif
  
  // Whether to support timeout exceptions (like socket.timeout)
  #ifndef MICROPY_PY_BUILTINS_TIMEOUTERROR
  #define MICROPY_PY_BUILTINS_TIMEOUTERROR (0)
  #endif
  
  // Whether to support complete set of special methods
  // for user classes, otherwise only the most used
  #ifndef MICROPY_PY_ALL_SPECIAL_METHODS
  #define MICROPY_PY_ALL_SPECIAL_METHODS (0)
  #endif
  
  // Whether to support compile function
  #ifndef MICROPY_PY_BUILTINS_COMPILE
  #define MICROPY_PY_BUILTINS_COMPILE (0)
  #endif
  
  // Whether to support enumerate function(type)
  #ifndef MICROPY_PY_BUILTINS_ENUMERATE
  #define MICROPY_PY_BUILTINS_ENUMERATE (1)
  #endif
  
  // Whether to support eval and exec functions
  // By default they are supported if the compiler is enabled
  #ifndef MICROPY_PY_BUILTINS_EVAL_EXEC
  #define MICROPY_PY_BUILTINS_EVAL_EXEC (MICROPY_ENABLE_COMPILER)
  #endif
  
  // Whether to support the Python 2 execfile function
  #ifndef MICROPY_PY_BUILTINS_EXECFILE
  #define MICROPY_PY_BUILTINS_EXECFILE (0)
  #endif
  
  // Whether to support filter function(type)
  #ifndef MICROPY_PY_BUILTINS_FILTER
  #define MICROPY_PY_BUILTINS_FILTER (1)
  #endif
  
  // Whether to support reversed function(type)
  #ifndef MICROPY_PY_BUILTINS_REVERSED
  #define MICROPY_PY_BUILTINS_REVERSED (1)
  #endif
  
  // Whether to define "NotImplemented" special constant
  #ifndef MICROPY_PY_BUILTINS_NOTIMPLEMENTED
  #define MICROPY_PY_BUILTINS_NOTIMPLEMENTED (0)
  #endif
  
  // Whether to support min/max functions
  #ifndef MICROPY_PY_BUILTINS_MIN_MAX
  #define MICROPY_PY_BUILTINS_MIN_MAX (1)
  #endif
  
  // Whether to set __file__ for imported modules
  #ifndef MICROPY_PY___FILE__
  #define MICROPY_PY___FILE__ (1)
  #endif
  
  // Whether to provide mem-info related functions in micropython module
  #ifndef MICROPY_PY_MICROPYTHON_MEM_INFO
  #define MICROPY_PY_MICROPYTHON_MEM_INFO (0)
  #endif
  
  // Whether to provide "array" module. Note that large chunk of the
  // underlying code is shared with "bytearray" builtin type, so to
  // get real savings, it should be disabled too.
  #ifndef MICROPY_PY_ARRAY
  #define MICROPY_PY_ARRAY (1)
  #endif
  
  // Whether to support slice assignments for array (and bytearray).
  // This is rarely used, but adds ~0.5K of code.
  #ifndef MICROPY_PY_ARRAY_SLICE_ASSIGN
  #define MICROPY_PY_ARRAY_SLICE_ASSIGN (0)
  #endif
  
  // Whether to support attrtuple type (MicroPython extension)
  // It provides space-efficient tuples with attribute access
  #ifndef MICROPY_PY_ATTRTUPLE
  #define MICROPY_PY_ATTRTUPLE (1)
  #endif
  
  // Whether to provide "collections" module
  #ifndef MICROPY_PY_COLLECTIONS
  #define MICROPY_PY_COLLECTIONS (1)
  #endif
  
  // Whether to provide "collections.OrderedDict" type
  #ifndef MICROPY_PY_COLLECTIONS_ORDEREDDICT
  #define MICROPY_PY_COLLECTIONS_ORDEREDDICT (0)
  #endif
  
  // Whether to provide "math" module
  #ifndef MICROPY_PY_MATH
  #define MICROPY_PY_MATH (1)
  #endif
  
  // Whether to provide special math functions: math.{erf,erfc,gamma,lgamma}
  #ifndef MICROPY_PY_MATH_SPECIAL_FUNCTIONS
  #define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (0)
  #endif
  
  // Whether to provide "cmath" module
  #ifndef MICROPY_PY_CMATH
  #define MICROPY_PY_CMATH (0)
  #endif
  
  // Whether to provide "gc" module
  #ifndef MICROPY_PY_GC
  #define MICROPY_PY_GC (1)
  #endif
  
  // Whether to return number of collected objects from gc.collect()
  #ifndef MICROPY_PY_GC_COLLECT_RETVAL
  #define MICROPY_PY_GC_COLLECT_RETVAL (0)
  #endif
  
  // Whether to provide "io" module
  #ifndef MICROPY_PY_IO
  #define MICROPY_PY_IO (1)
  #endif
  
  // Whether to provide "io.FileIO" class
  #ifndef MICROPY_PY_IO_FILEIO
  #define MICROPY_PY_IO_FILEIO (0)
  #endif
  
  // Whether to provide "io.BytesIO" class
  #ifndef MICROPY_PY_IO_BYTESIO
  #define MICROPY_PY_IO_BYTESIO (1)
  #endif
  
  // Whether to provide "io.BufferedWriter" class
  #ifndef MICROPY_PY_IO_BUFFEREDWRITER
  #define MICROPY_PY_IO_BUFFEREDWRITER (0)
  #endif
  
  // Whether to provide "struct" module
  #ifndef MICROPY_PY_STRUCT
  #define MICROPY_PY_STRUCT (1)
  #endif
  
  // Whether to provide "sys" module
  #ifndef MICROPY_PY_SYS
  #define MICROPY_PY_SYS (1)
  #endif
  
  // Whether to provide "sys.maxsize" constant
  #ifndef MICROPY_PY_SYS_MAXSIZE
  #define MICROPY_PY_SYS_MAXSIZE (0)
  #endif
  
  // Whether to provide "sys.modules" dictionary
  #ifndef MICROPY_PY_SYS_MODULES
  #define MICROPY_PY_SYS_MODULES (1)
  #endif
  
  // Whether to provide "sys.exc_info" function
  // Avoid enabling this, this function is Python2 heritage
  #ifndef MICROPY_PY_SYS_EXC_INFO
  #define MICROPY_PY_SYS_EXC_INFO (0)
  #endif
  
  // Whether to provide "sys.exit" function
  #ifndef MICROPY_PY_SYS_EXIT
  #define MICROPY_PY_SYS_EXIT (0)
  #endif
  
  // Whether to provide sys.{stdin,stdout,stderr} objects
  #ifndef MICROPY_PY_SYS_STDFILES
  #define MICROPY_PY_SYS_STDFILES (0)
  #endif
  
  // Whether to provide sys.{stdin,stdout,stderr}.buffer object
  // This is implemented per-port
  #ifndef MICROPY_PY_SYS_STDIO_BUFFER
  #define MICROPY_PY_SYS_STDIO_BUFFER (0)
  #endif
  
  // Whether to provide "uerrno" module
  #ifndef MICROPY_PY_UERRNO
  #define MICROPY_PY_UERRNO (0)
  #endif
  
  // Whether to provide "_thread" module
  #ifndef MICROPY_PY_THREAD
  #define MICROPY_PY_THREAD (0)
  #endif
  
  // Whether to make the VM/runtime thread-safe using a global lock
  // If not enabled then thread safety must be provided at the Python level
  #ifndef MICROPY_PY_THREAD_GIL
  #define MICROPY_PY_THREAD_GIL (MICROPY_PY_THREAD)
  #endif
  
  // Extended modules
  
  #ifndef MICROPY_PY_UCTYPES
  #define MICROPY_PY_UCTYPES (0)
  #endif
  
  #ifndef MICROPY_PY_UZLIB
  #define MICROPY_PY_UZLIB (0)
  #endif
  
  #ifndef MICROPY_PY_UJSON
  #define MICROPY_PY_UJSON (0)
  #endif
  
  #ifndef MICROPY_PY_URE
  #define MICROPY_PY_URE (0)
  #endif
  
  #ifndef MICROPY_PY_UHEAPQ
  #define MICROPY_PY_UHEAPQ (0)
  #endif
  
  #ifndef MICROPY_PY_UHASHLIB
  #define MICROPY_PY_UHASHLIB (0)
  #endif
  
  #ifndef MICROPY_PY_UBINASCII
  #define MICROPY_PY_UBINASCII (0)
  #endif
  
  #ifndef MICROPY_PY_URANDOM
  #define MICROPY_PY_URANDOM (0)
  #endif
  
  // Whether to include: randrange, randint, choice, random, uniform
  #ifndef MICROPY_PY_URANDOM_EXTRA_FUNCS
  #define MICROPY_PY_URANDOM_EXTRA_FUNCS (0)
  #endif
  
  #ifndef MICROPY_PY_MACHINE
  #define MICROPY_PY_MACHINE (0)
  #endif
  
  // Whether to include: time_pulse_us
  #ifndef MICROPY_PY_MACHINE_PULSE
  #define MICROPY_PY_MACHINE_PULSE (0)
  #endif
  
  #ifndef MICROPY_PY_MACHINE_I2C
  #define MICROPY_PY_MACHINE_I2C (0)
  #endif
  
  #ifndef MICROPY_PY_USSL
  #define MICROPY_PY_USSL (0)
  #endif
  
  #ifndef MICROPY_PY_WEBSOCKET
  #define MICROPY_PY_WEBSOCKET (0)
  #endif
  
  #ifndef MICROPY_PY_FRAMEBUF
  #define MICROPY_PY_FRAMEBUF (0)
  #endif
  
  /*****************************************************************************/
  /* Hooks for a port to add builtins                                          */
  
  // Additional builtin function definitions - see builtintables.c:builtin_object_table for format.
  #ifndef MICROPY_PORT_BUILTINS
  #define MICROPY_PORT_BUILTINS
  #endif
  
  // Additional builtin module definitions - see builtintables.c:builtin_module_table for format.
  #ifndef MICROPY_PORT_BUILTIN_MODULES
  #define MICROPY_PORT_BUILTIN_MODULES
  #endif
  
  // Any module weak links - see builtintables.c:mp_builtin_module_weak_links_table.
  #ifndef MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS
  #define MICROPY_PORT_BUILTIN_MODULE_WEAK_LINKS
  #endif
  
  // Additional constant definitions for the compiler - see compile.c:mp_constants_table.
  #ifndef MICROPY_PORT_CONSTANTS
  #define MICROPY_PORT_CONSTANTS
  #endif
  
  // Any root pointers for GC scanning - see mpstate.c
  #ifndef MICROPY_PORT_ROOT_POINTERS
  #define MICROPY_PORT_ROOT_POINTERS
  #endif
  
  /*****************************************************************************/
  /* Miscellaneous settings                                                    */
  
  // All uPy objects in ROM must be aligned on at least a 4 byte boundary
  // so that the small-int/qstr/pointer distinction can be made.  For machines
  // that don't do this (eg 16-bit CPU), define the following macro to something
  // like __attribute__((aligned(4))).
  #ifndef MICROPY_OBJ_BASE_ALIGNMENT
  #define MICROPY_OBJ_BASE_ALIGNMENT
  #endif
  
  // On embedded platforms, these will typically enable/disable irqs.
  #ifndef MICROPY_BEGIN_ATOMIC_SECTION
  #define MICROPY_BEGIN_ATOMIC_SECTION() (0)
  #endif
  #ifndef MICROPY_END_ATOMIC_SECTION
  #define MICROPY_END_ATOMIC_SECTION(state) (void)(state)
  #endif
  
  // Allow to override static modifier for global objects, e.g. to use with
  // object code analysis tools which don't support static symbols.
  #ifndef STATIC
  #define STATIC static
  #endif
  
  #define BITS_PER_BYTE (8)
  #define BITS_PER_WORD (BITS_PER_BYTE * BYTES_PER_WORD)
  // mp_int_t value with most significant bit set
  #define WORD_MSBIT_HIGH (((mp_uint_t)1) << (BYTES_PER_WORD * 8 - 1))
  
  // Make sure both MP_ENDIANNESS_LITTLE and MP_ENDIANNESS_BIG are
  // defined and that they are the opposite of each other.
  #if defined(MP_ENDIANNESS_LITTLE)
  #define MP_ENDIANNESS_BIG (!MP_ENDIANNESS_LITTLE)
  #elif defined(MP_ENDIANNESS_BIG)
  #define MP_ENDIANNESS_LITTLE (!MP_ENDIANNESS_BIG)
  #else
    // Endiannes not defined by port so try to autodetect it.
    #if defined(__BYTE_ORDER__)
      #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
        #define MP_ENDIANNESS_LITTLE (1)
      #else
        #define MP_ENDIANNESS_LITTLE (0)
      #endif
    #elif defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined (_LITTLE_ENDIAN)
      #define MP_ENDIANNESS_LITTLE (1)
    #elif defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined (_BIG_ENDIAN)
      #define MP_ENDIANNESS_LITTLE (0)
    #else
      #include <endian.h>
        #if defined(__BYTE_ORDER)
          #if __BYTE_ORDER == __LITTLE_ENDIAN
            #define MP_ENDIANNESS_LITTLE (1)
          #else
            #define MP_ENDIANNESS_LITTLE (0)
          #endif
        #else
          #error endianness not defined and cannot detect it
        #endif
    #endif
    #define MP_ENDIANNESS_BIG (!MP_ENDIANNESS_LITTLE)
  #endif
  
  // Make a pointer to RAM callable (eg set lower bit for Thumb code)
  // (This scheme won't work if we want to mix Thumb and normal ARM code.)
  #ifndef MICROPY_MAKE_POINTER_CALLABLE
  #define MICROPY_MAKE_POINTER_CALLABLE(p) (p)
  #endif
  
  // If these MP_PLAT_*_EXEC macros are overridden then the memory allocated by them
  // must be somehow reachable for marking by the GC, since the native code
  // generators store pointers to GC managed memory in the code.
  #ifndef MP_PLAT_ALLOC_EXEC
  #define MP_PLAT_ALLOC_EXEC(min_size, ptr, size) do { *ptr = m_new(byte, min_size); *size = min_size; } while (0)
  #endif
  
  #ifndef MP_PLAT_FREE_EXEC
  #define MP_PLAT_FREE_EXEC(ptr, size) m_del(byte, ptr, size)
  #endif
  
  // This macro is used to do all output (except when MICROPY_PY_IO is defined)
  #ifndef MP_PLAT_PRINT_STRN
  #define MP_PLAT_PRINT_STRN(str, len) mp_hal_stdout_tx_strn_cooked(str, len)
  #endif
  
  #ifndef MP_SSIZE_MAX
  #define MP_SSIZE_MAX SSIZE_MAX
  #endif
  
  // printf format spec to use for mp_int_t and friends
  #ifndef INT_FMT
  #if defined(__LP64__)
  // Archs where mp_int_t == long, long != int
  #define UINT_FMT "%lu"
  #define INT_FMT "%ld"
  #elif defined(_WIN64)
  #define UINT_FMT "%llu"
  #define INT_FMT "%lld"
  #else
  // Archs where mp_int_t == int
  #define UINT_FMT "%u"
  #define INT_FMT "%d"
  #endif
  #endif //INT_FMT
  
  // Modifier for function which doesn't return
  #ifndef NORETURN
  #define NORETURN __attribute__((noreturn))
  #endif
  
  // Modifier for weak functions
  #ifndef MP_WEAK
  #define MP_WEAK __attribute__((weak))
  #endif
  
  // Modifier for functions which should be never inlined
  #ifndef MP_NOINLINE
  #define MP_NOINLINE __attribute__((noinline))
  #endif
  
  // Condition is likely to be true, to help branch prediction
  #ifndef MP_LIKELY
  #define MP_LIKELY(x) __builtin_expect((x), 1)
  #endif
  
  // Condition is likely to be false, to help branch prediction
  #ifndef MP_UNLIKELY
  #define MP_UNLIKELY(x) __builtin_expect((x), 0)
  #endif
  
  #endif // __MICROPY_INCLUDED_PY_MPCONFIG_H__
  