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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.
#include "v8.h"
#include "frames-inl.h"
#include "assembler-arm-inl.h"
namespace v8 { namespace internal {
StackFrame::Type StackFrame::ComputeType(State* state) {
ASSERT(state->fp != NULL);
if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
return ARGUMENTS_ADAPTOR;
}
// The marker and function offsets overlap. If the marker isn't a
// smi then the frame is a JavaScript frame -- and the marker is
// really the function.
const int offset = StandardFrameConstants::kMarkerOffset;
Object* marker = Memory::Object_at(state->fp + offset);
if (!marker->IsSmi()) return JAVA_SCRIPT;
return static_cast<StackFrame::Type>(Smi::cast(marker)->value());
}
StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
if (fp == 0) return NONE;
// Compute frame type and stack pointer.
Address sp = fp + ExitFrameConstants::kSPDisplacement;
Type type;
if (Memory::Address_at(fp + ExitFrameConstants::kDebugMarkOffset) != 0) {
type = EXIT_DEBUG;
sp -= kNumJSCallerSaved * kPointerSize;
} else {
type = EXIT;
}
// Fill in the state.
state->sp = sp;
state->fp = fp;
state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
return type;
}
void ExitFrame::Iterate(ObjectVisitor* v) const {
// Do nothing
}
int JavaScriptFrame::GetProvidedParametersCount() const {
return ComputeParametersCount();
}
Address JavaScriptFrame::GetCallerStackPointer() const {
int arguments;
if (Heap::gc_state() != Heap::NOT_IN_GC || disable_heap_access_) {
// The arguments for cooked frames are traversed as if they were
// expression stack elements of the calling frame. The reason for
// this rather strange decision is that we cannot access the
// function during mark-compact GCs when the stack is cooked.
// In fact accessing heap objects (like function->shared() below)
// at all during GC is problematic.
arguments = 0;
} else {
// Compute the number of arguments by getting the number of formal
// parameters of the function. We must remember to take the
// receiver into account (+1).
JSFunction* function = JSFunction::cast(this->function());
arguments = function->shared()->formal_parameter_count() + 1;
}
const int offset = StandardFrameConstants::kCallerSPOffset;
return fp() + offset + (arguments * kPointerSize);
}
Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
const int arguments = Smi::cast(GetExpression(0))->value();
const int offset = StandardFrameConstants::kCallerSPOffset;
return fp() + offset + (arguments + 1) * kPointerSize;
}
Address InternalFrame::GetCallerStackPointer() const {
// Internal frames have no arguments. The stack pointer of the
// caller is at a fixed offset from the frame pointer.
return fp() + StandardFrameConstants::kCallerSPOffset;
}
} } // namespace v8::internal
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