frames-inl.h.svn-base

Google浏览器V8内核代码

// Copyright 2006-2008 the V8 project authors. All rights reserved.
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#ifndef V8_FRAMES_INL_H_
#define V8_FRAMES_INL_H_

#include "frames.h"
#if defined(ARM) || defined (__arm__) || defined(__thumb__)
#include "frames-arm.h"
#else
#include "frames-ia32.h"
#endif


namespace v8 { namespace internal {


inline Address StackHandler::address() const {
  // NOTE: There's an obvious problem with the address of the NULL
  // stack handler. Right now, it benefits us that the subtraction
  // leads to a very high address (above everything else on the
  // stack), but maybe we should stop relying on it?
  const int displacement = StackHandlerConstants::kAddressDisplacement;
  Address address = reinterpret_cast<Address>(const_cast<StackHandler*>(this));
  return address + displacement;
}


inline StackHandler* StackHandler::next() const {
  const int offset = StackHandlerConstants::kNextOffset;
  return FromAddress(Memory::Address_at(address() + offset));
}


inline bool StackHandler::includes(Address address) const {
  Address start = this->address();
  Address end = start + StackHandlerConstants::kSize;
  return start <= address && address <= end;
}


inline void StackHandler::Iterate(ObjectVisitor* v) const {
  // Stack handlers do not contain any pointers that need to be
  // traversed. The only field that have to worry about is the code
  // field which is unused and should always be uninitialized.
#ifdef DEBUG
  const int offset = StackHandlerConstants::kCodeOffset;
  Object* code = Memory::Object_at(address() + offset);
  ASSERT(Smi::cast(code)->value() == StackHandler::kCodeNotPresent);
#endif
}


inline StackHandler* StackHandler::FromAddress(Address address) {
  return reinterpret_cast<StackHandler*>(address);
}


inline StackHandler::State StackHandler::state() const {
  const int offset = StackHandlerConstants::kStateOffset;
  return static_cast<State>(Memory::int_at(address() + offset));
}


inline Address StackHandler::pc() const {
  const int offset = StackHandlerConstants::kPCOffset;
  return Memory::Address_at(address() + offset);
}


inline void StackHandler::set_pc(Address value) {
  const int offset = StackHandlerConstants::kPCOffset;
  Memory::Address_at(address() + offset) = value;
}


inline StackHandler* StackFrame::top_handler() const {
  return iterator_->handler();
}


inline Object* StandardFrame::GetExpression(int index) const {
  return Memory::Object_at(GetExpressionAddress(index));
}


inline void StandardFrame::SetExpression(int index, Object* value) {
  Memory::Object_at(GetExpressionAddress(index)) = value;
}


inline Object* StandardFrame::context() const {
  const int offset = StandardFrameConstants::kContextOffset;
  return Memory::Object_at(fp() + offset);
}


inline Address StandardFrame::caller_sp() const {
  return pp();
}


inline Address StandardFrame::caller_fp() const {
  return Memory::Address_at(fp() + StandardFrameConstants::kCallerFPOffset);
}


inline Address StandardFrame::caller_pc() const {
  return Memory::Address_at(ComputePCAddress(fp()));
}


inline Address StandardFrame::ComputePCAddress(Address fp) {
  return fp + StandardFrameConstants::kCallerPCOffset;
}


inline bool StandardFrame::IsArgumentsAdaptorFrame(Address fp) {
  int context = Memory::int_at(fp + StandardFrameConstants::kContextOffset);
  return context == ArgumentsAdaptorFrame::SENTINEL;
}


inline bool StandardFrame::IsConstructTrampolineFrame(Address pc) {
  return Builtins::builtin(Builtins::JSConstructCall)->contains(pc);
}


inline Object* JavaScriptFrame::receiver() const {
  const int offset = JavaScriptFrameConstants::kReceiverOffset;
  return Memory::Object_at(pp() + offset);
}


inline void JavaScriptFrame::set_receiver(Object* value) {
  const int offset = JavaScriptFrameConstants::kReceiverOffset;
  Memory::Object_at(pp() + offset) = value;
}


inline bool JavaScriptFrame::has_adapted_arguments() const {
  return IsArgumentsAdaptorFrame(caller_fp());
}


inline bool InternalFrame::is_construct_trampoline() const {
  // TODO(1233795): This doesn't work when the stack frames have been
  // cooked. We need to find another way of identifying construct
  // trampoline frames possibly by manipulating the context field like
  // we do for argument adaptor frames.
  return IsConstructTrampolineFrame(pc());
}


inline JavaScriptFrame* JavaScriptFrameIterator::frame() const {
  // TODO(1233797): The frame hierarchy needs to change. It's
  // problematic that we can't use the safe-cast operator to cast to
  // the JavaScript frame type, because we may encounter arguments
  // adaptor frames.
  StackFrame* frame = iterator_.frame();
  ASSERT(frame->is_java_script() || frame->is_arguments_adaptor());
  return static_cast<JavaScriptFrame*>(frame);
}


} }  // namespace v8::internal

#endif  // V8_FRAMES_INL_H_