text: // Copyright 2012 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #ifndef V8_IC_INL_H_
  #define V8_IC_INL_H_
  
  #include "ic.h"
  
  #include "compiler.h"
  #include "debug.h"
  #include "macro-assembler.h"
  
  namespace v8 {
  namespace internal {
  
  
  Address IC::address() const {
    // Get the address of the call.
    Address result = Assembler::target_address_from_return_address(pc());
  
  #ifdef ENABLE_DEBUGGER_SUPPORT
    Debug* debug = isolate()->debug();
    // First check if any break points are active if not just return the address
    // of the call.
    if (!debug->has_break_points()) return result;
  
    // At least one break point is active perform additional test to ensure that
    // break point locations are updated correctly.
    if (debug->IsDebugBreak(Assembler::target_address_at(result))) {
      // If the call site is a call to debug break then return the address in
      // the original code instead of the address in the running code. This will
      // cause the original code to be updated and keeps the breakpoint active in
      // the running code.
      return OriginalCodeAddress();
    } else {
      // No break point here just return the address of the call.
      return result;
    }
  #else
    return result;
  #endif
  }
  
  
  Code* IC::GetTargetAtAddress(Address address) {
    // Get the target address of the IC.
    Address target = Assembler::target_address_at(address);
    // Convert target address to the code object. Code::GetCodeFromTargetAddress
    // is safe for use during GC where the map might be marked.
    Code* result = Code::GetCodeFromTargetAddress(target);
    ASSERT(result->is_inline_cache_stub());
    return result;
  }
  
  
  void IC::SetTargetAtAddress(Address address, Code* target) {
    ASSERT(target->is_inline_cache_stub() || target->is_compare_ic_stub());
    Heap* heap = target->GetHeap();
    Code* old_target = GetTargetAtAddress(address);
  #ifdef DEBUG
    // STORE_IC and KEYED_STORE_IC use Code::extra_ic_state() to mark
    // ICs as strict mode. The strict-ness of the IC must be preserved.
    if (old_target->kind() == Code::STORE_IC ||
        old_target->kind() == Code::KEYED_STORE_IC) {
      ASSERT(Code::GetStrictMode(old_target->extra_ic_state()) ==
             Code::GetStrictMode(target->extra_ic_state()));
    }
  #endif
    Assembler::set_target_address_at(address, target->instruction_start());
    if (heap->gc_state() == Heap::MARK_COMPACT) {
      heap->mark_compact_collector()->RecordCodeTargetPatch(address, target);
    } else {
      heap->incremental_marking()->RecordCodeTargetPatch(address, target);
    }
    PostPatching(address, target, old_target);
  }
  
  
  InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object) {
    if (object->IsJSObject()) return OWN_MAP;
  
    // If the object is a value, we use the prototype map for the cache.
    ASSERT(object->IsString() || object->IsSymbol() ||
           object->IsNumber() || object->IsBoolean());
    return PROTOTYPE_MAP;
  }
  
  
  HeapObject* IC::GetCodeCacheHolder(Isolate* isolate,
                                   Object* object,
                                   InlineCacheHolderFlag holder) {
    if (object->IsSmi()) holder = PROTOTYPE_MAP;
    Object* map_owner = holder == OWN_MAP
        ? object : object->GetPrototype(isolate);
    return HeapObject::cast(map_owner);
  }
  
  
  } }  // namespace v8::internal
  
  #endif  // V8_IC_INL_H_
  