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// Copyright 2006-2008 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 "debug.h"
#include "macro-assembler.h"
namespace v8 {
namespace internal {
Address IC::address() {
// Get the address of the call.
Address result = pc() - Assembler::kCallTargetAddressOffset;
#ifdef ENABLE_DEBUGGER_SUPPORT
Debug* debug = Isolate::Current()->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());
#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.
Code* old_target = GetTargetAtAddress(address);
if (old_target->kind() == Code::STORE_IC ||
old_target->kind() == Code::KEYED_STORE_IC) {
ASSERT(old_target->extra_ic_state() == target->extra_ic_state());
}
#endif
Assembler::set_target_address_at(address, target->instruction_start());
target->GetHeap()->incremental_marking()->RecordCodeTargetPatch(address,
target);
}
InlineCacheHolderFlag IC::GetCodeCacheForObject(Object* object,
JSObject* holder) {
if (object->IsJSObject()) {
return GetCodeCacheForObject(JSObject::cast(object), holder);
}
// If the object is a value, we use the prototype map for the cache.
ASSERT(object->IsString() || object->IsNumber() || object->IsBoolean());
return PROTOTYPE_MAP;
}
InlineCacheHolderFlag IC::GetCodeCacheForObject(JSObject* object,
JSObject* holder) {
// Fast-properties and global objects store stubs in their own maps.
// Slow properties objects use prototype's map (unless the property is its own
// when holder == object). It works because slow properties objects having
// the same prototype (or a prototype with the same map) and not having
// the property are interchangeable for such a stub.
if (holder != object &&
!object->HasFastProperties() &&
!object->IsJSGlobalProxy() &&
!object->IsJSGlobalObject()) {
return PROTOTYPE_MAP;
}
return OWN_MAP;
}
JSObject* IC::GetCodeCacheHolder(Object* object, InlineCacheHolderFlag holder) {
Object* map_owner = (holder == OWN_MAP ? object : object->GetPrototype());
ASSERT(map_owner->IsJSObject());
return JSObject::cast(map_owner);
}
} } // namespace v8::internal
#endif // V8_IC_INL_H_
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