2009-05-04 07:16:10 +00:00
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// Copyright 2009 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2009-06-11 13:51:46 +00:00
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#include "v8.h"
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#include "codegen-inl.h"
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#include "register-allocator-inl.h"
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#include "scopes.h"
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namespace v8 {
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namespace internal {
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#define __ ACCESS_MASM(masm())
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// -------------------------------------------------------------------------
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// VirtualFrame implementation.
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// On entry to a function, the virtual frame already contains the receiver,
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// the parameters, and a return address. All frame elements are in memory.
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VirtualFrame::VirtualFrame()
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: elements_(parameter_count() + local_count() + kPreallocatedElements),
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stack_pointer_(parameter_count() + 1) { // 0-based index of TOS.
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for (int i = 0; i <= stack_pointer_; i++) {
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elements_.Add(FrameElement::MemoryElement());
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}
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for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
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register_locations_[i] = kIllegalIndex;
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}
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}
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void VirtualFrame::Enter() {
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// Registers live on entry to a JS frame:
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// rsp: stack pointer, points to return address from this function.
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// rbp: base pointer, points to previous JS, ArgumentsAdaptor, or
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// Trampoline frame.
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// rsi: context of this function call.
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// rdi: pointer to this function object.
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Comment cmnt(masm(), "[ Enter JS frame");
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#ifdef DEBUG
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// Verify that rdi contains a JS function. The following code
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// relies on rax being available for use.
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__ testq(rdi, Immediate(kSmiTagMask));
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__ Check(not_zero,
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"VirtualFrame::Enter - rdi is not a function (smi check).");
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__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rax);
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__ Check(equal,
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"VirtualFrame::Enter - rdi is not a function (map check).");
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#endif
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EmitPush(rbp);
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__ movq(rbp, rsp);
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// Store the context in the frame. The context is kept in rsi and a
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// copy is stored in the frame. The external reference to rsi
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// remains.
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EmitPush(rsi);
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// Store the function in the frame. The frame owns the register
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// reference now (ie, it can keep it in rdi or spill it later).
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Push(rdi);
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// SyncElementAt(element_count() - 1);
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cgen()->allocator()->Unuse(rdi);
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}
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void VirtualFrame::Exit() {
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Comment cmnt(masm(), "[ Exit JS frame");
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// Record the location of the JS exit code for patching when setting
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// break point.
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__ RecordJSReturn();
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// Avoid using the leave instruction here, because it is too
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// short. We need the return sequence to be a least the size of a
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// call instruction to support patching the exit code in the
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// debugger. See VisitReturnStatement for the full return sequence.
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__ movq(rsp, rbp);
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stack_pointer_ = frame_pointer();
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for (int i = element_count() - 1; i > stack_pointer_; i--) {
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FrameElement last = elements_.RemoveLast();
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if (last.is_register()) {
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Unuse(last.reg());
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}
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}
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EmitPop(rbp);
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}
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void VirtualFrame::EmitPop(Register reg) {
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ASSERT(stack_pointer_ == element_count() - 1);
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stack_pointer_--;
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elements_.RemoveLast();
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__ pop(reg);
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}
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void VirtualFrame::EmitPop(const Operand& operand) {
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ASSERT(stack_pointer_ == element_count() - 1);
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stack_pointer_--;
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elements_.RemoveLast();
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__ pop(operand);
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}
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void VirtualFrame::EmitPush(Register reg) {
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ASSERT(stack_pointer_ == element_count() - 1);
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elements_.Add(FrameElement::MemoryElement());
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stack_pointer_++;
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__ push(reg);
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}
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void VirtualFrame::EmitPush(const Operand& operand) {
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ASSERT(stack_pointer_ == element_count() - 1);
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elements_.Add(FrameElement::MemoryElement());
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stack_pointer_++;
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__ push(operand);
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}
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void VirtualFrame::EmitPush(Immediate immediate) {
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ASSERT(stack_pointer_ == element_count() - 1);
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elements_.Add(FrameElement::MemoryElement());
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stack_pointer_++;
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__ push(immediate);
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}
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void VirtualFrame::Drop(int a) {
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UNIMPLEMENTED();
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}
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int VirtualFrame::InvalidateFrameSlotAt(int a) {
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UNIMPLEMENTED();
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return -1;
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}
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void VirtualFrame::MergeTo(VirtualFrame* a) {
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UNIMPLEMENTED();
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}
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Result VirtualFrame::Pop() {
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UNIMPLEMENTED();
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return Result(NULL);
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}
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Result VirtualFrame::RawCallStub(CodeStub* a) {
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UNIMPLEMENTED();
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return Result(NULL);
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}
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void VirtualFrame::SyncElementBelowStackPointer(int a) {
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UNIMPLEMENTED();
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}
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void VirtualFrame::SyncElementByPushing(int a) {
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UNIMPLEMENTED();
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}
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void VirtualFrame::SyncRange(int a, int b) {
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UNIMPLEMENTED();
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}
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#undef __
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} } // namespace v8::internal
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