Revision f230a1cf deps/v8/src/ia32/deoptimizer-ia32.cc
| deps/v8/src/ia32/deoptimizer-ia32.cc | ||
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} |
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static const byte kJnsInstruction = 0x79; |
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static const byte kJnsOffset = 0x11; |
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static const byte kCallInstruction = 0xe8; |
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static const byte kNopByteOne = 0x66; |
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static const byte kNopByteTwo = 0x90; |
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// The back edge bookkeeping code matches the pattern: |
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// |
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// sub <profiling_counter>, <delta> |
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// jns ok |
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// call <interrupt stub> |
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// ok: |
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// |
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// The patched back edge looks like this: |
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// |
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// sub <profiling_counter>, <delta> ;; Not changed |
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// nop |
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// nop |
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// call <on-stack replacment> |
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// ok: |
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void Deoptimizer::PatchInterruptCodeAt(Code* unoptimized_code, |
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Address pc_after, |
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Code* replacement_code) {
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// Turn the jump into nops. |
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Address call_target_address = pc_after - kIntSize; |
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*(call_target_address - 3) = kNopByteOne; |
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*(call_target_address - 2) = kNopByteTwo; |
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// Replace the call address. |
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Assembler::set_target_address_at(call_target_address, |
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replacement_code->entry()); |
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unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch( |
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unoptimized_code, call_target_address, replacement_code); |
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} |
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void Deoptimizer::RevertInterruptCodeAt(Code* unoptimized_code, |
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Address pc_after, |
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Code* interrupt_code) {
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// Restore the original jump. |
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Address call_target_address = pc_after - kIntSize; |
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*(call_target_address - 3) = kJnsInstruction; |
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*(call_target_address - 2) = kJnsOffset; |
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// Restore the original call address. |
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Assembler::set_target_address_at(call_target_address, |
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interrupt_code->entry()); |
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interrupt_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch( |
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unoptimized_code, call_target_address, interrupt_code); |
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} |
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#ifdef DEBUG |
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Deoptimizer::InterruptPatchState Deoptimizer::GetInterruptPatchState( |
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Isolate* isolate, |
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Code* unoptimized_code, |
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Address pc_after) {
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Address call_target_address = pc_after - kIntSize; |
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ASSERT_EQ(kCallInstruction, *(call_target_address - 1)); |
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if (*(call_target_address - 3) == kNopByteOne) {
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ASSERT_EQ(kNopByteTwo, *(call_target_address - 2)); |
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Code* osr_builtin = |
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isolate->builtins()->builtin(Builtins::kOnStackReplacement); |
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ASSERT_EQ(osr_builtin->entry(), |
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Assembler::target_address_at(call_target_address)); |
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return PATCHED_FOR_OSR; |
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} else {
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// Get the interrupt stub code object to match against from cache. |
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Code* interrupt_builtin = |
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isolate->builtins()->builtin(Builtins::kInterruptCheck); |
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ASSERT_EQ(interrupt_builtin->entry(), |
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Assembler::target_address_at(call_target_address)); |
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ASSERT_EQ(kJnsInstruction, *(call_target_address - 3)); |
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ASSERT_EQ(kJnsOffset, *(call_target_address - 2)); |
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return NOT_PATCHED; |
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} |
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} |
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#endif // DEBUG |
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void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
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// Set the register values. The values are not important as there are no |
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// callee saved registers in JavaScript frames, so all registers are |
| ... | ... | |
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FrameDescription* output_frame, CodeStubInterfaceDescriptor* descriptor) {
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intptr_t handler = |
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reinterpret_cast<intptr_t>(descriptor->deoptimization_handler_); |
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int params = descriptor->register_param_count_; |
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if (descriptor->stack_parameter_count_ != NULL) {
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params++; |
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} |
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int params = descriptor->environment_length(); |
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output_frame->SetRegister(eax.code(), params); |
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output_frame->SetRegister(ebx.code(), handler); |
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} |
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void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) {
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if (!CpuFeatures::IsSupported(SSE2)) return; |
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for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
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double double_value = input_->GetDoubleRegister(i); |
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output_frame->SetDoubleRegister(i, double_value); |
| ... | ... | |
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for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
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XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i); |
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int offset = i * kDoubleSize; |
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__ movdbl(Operand(esp, offset), xmm_reg);
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__ movsd(Operand(esp, offset), xmm_reg);
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} |
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} |
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| ... | ... | |
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for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
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int dst_offset = i * kDoubleSize + double_regs_offset; |
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int src_offset = i * kDoubleSize; |
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__ movdbl(xmm0, Operand(esp, src_offset));
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__ movdbl(Operand(ebx, dst_offset), xmm0);
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__ movsd(xmm0, Operand(esp, src_offset));
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__ movsd(Operand(ebx, dst_offset), xmm0);
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} |
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} |
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| ... | ... | |
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for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
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XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i); |
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int src_offset = i * kDoubleSize + double_regs_offset; |
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__ movdbl(xmm_reg, Operand(ebx, src_offset));
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__ movsd(xmm_reg, Operand(ebx, src_offset));
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} |
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} |
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