| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/v8.h" |
| |
| #if V8_TARGET_ARCH_X64 |
| |
| #include "src/codegen.h" |
| #include "src/deoptimizer.h" |
| #include "src/full-codegen.h" |
| #include "src/safepoint-table.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| const int Deoptimizer::table_entry_size_ = 10; |
| |
| |
| int Deoptimizer::patch_size() { |
| return Assembler::kCallSequenceLength; |
| } |
| |
| |
| void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) { |
| // Invalidate the relocation information, as it will become invalid by the |
| // code patching below, and is not needed any more. |
| code->InvalidateRelocation(); |
| |
| if (FLAG_zap_code_space) { |
| // Fail hard and early if we enter this code object again. |
| byte* pointer = code->FindCodeAgeSequence(); |
| if (pointer != NULL) { |
| pointer += kNoCodeAgeSequenceLength; |
| } else { |
| pointer = code->instruction_start(); |
| } |
| CodePatcher patcher(pointer, 1); |
| patcher.masm()->int3(); |
| |
| DeoptimizationInputData* data = |
| DeoptimizationInputData::cast(code->deoptimization_data()); |
| int osr_offset = data->OsrPcOffset()->value(); |
| if (osr_offset > 0) { |
| CodePatcher osr_patcher(code->instruction_start() + osr_offset, 1); |
| osr_patcher.masm()->int3(); |
| } |
| } |
| |
| // For each LLazyBailout instruction insert a absolute call to the |
| // corresponding deoptimization entry, or a short call to an absolute |
| // jump if space is short. The absolute jumps are put in a table just |
| // before the safepoint table (space was allocated there when the Code |
| // object was created, if necessary). |
| |
| Address instruction_start = code->instruction_start(); |
| #ifdef DEBUG |
| Address prev_call_address = NULL; |
| #endif |
| DeoptimizationInputData* deopt_data = |
| DeoptimizationInputData::cast(code->deoptimization_data()); |
| SharedFunctionInfo* shared = |
| SharedFunctionInfo::cast(deopt_data->SharedFunctionInfo()); |
| shared->EvictFromOptimizedCodeMap(code, "deoptimized code"); |
| deopt_data->SetSharedFunctionInfo(Smi::FromInt(0)); |
| // For each LLazyBailout instruction insert a call to the corresponding |
| // deoptimization entry. |
| for (int i = 0; i < deopt_data->DeoptCount(); i++) { |
| if (deopt_data->Pc(i)->value() == -1) continue; |
| // Position where Call will be patched in. |
| Address call_address = instruction_start + deopt_data->Pc(i)->value(); |
| // There is room enough to write a long call instruction because we pad |
| // LLazyBailout instructions with nops if necessary. |
| CodePatcher patcher(call_address, Assembler::kCallSequenceLength); |
| patcher.masm()->Call(GetDeoptimizationEntry(isolate, i, LAZY), |
| Assembler::RelocInfoNone()); |
| ASSERT(prev_call_address == NULL || |
| call_address >= prev_call_address + patch_size()); |
| ASSERT(call_address + patch_size() <= code->instruction_end()); |
| #ifdef DEBUG |
| prev_call_address = call_address; |
| #endif |
| } |
| } |
| |
| |
| void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) { |
| // Set the register values. The values are not important as there are no |
| // callee saved registers in JavaScript frames, so all registers are |
| // spilled. Registers rbp and rsp are set to the correct values though. |
| for (int i = 0; i < Register::kNumRegisters; i++) { |
| input_->SetRegister(i, i * 4); |
| } |
| input_->SetRegister(rsp.code(), reinterpret_cast<intptr_t>(frame->sp())); |
| input_->SetRegister(rbp.code(), reinterpret_cast<intptr_t>(frame->fp())); |
| for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) { |
| input_->SetDoubleRegister(i, 0.0); |
| } |
| |
| // Fill the frame content from the actual data on the frame. |
| for (unsigned i = 0; i < input_->GetFrameSize(); i += kPointerSize) { |
| input_->SetFrameSlot(i, Memory::uintptr_at(tos + i)); |
| } |
| } |
| |
| |
| void Deoptimizer::SetPlatformCompiledStubRegisters( |
| FrameDescription* output_frame, CodeStubInterfaceDescriptor* descriptor) { |
| intptr_t handler = |
| reinterpret_cast<intptr_t>(descriptor->deoptimization_handler_); |
| int params = descriptor->GetHandlerParameterCount(); |
| output_frame->SetRegister(rax.code(), params); |
| output_frame->SetRegister(rbx.code(), handler); |
| } |
| |
| |
| void Deoptimizer::CopyDoubleRegisters(FrameDescription* output_frame) { |
| for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) { |
| double double_value = input_->GetDoubleRegister(i); |
| output_frame->SetDoubleRegister(i, double_value); |
| } |
| } |
| |
| |
| bool Deoptimizer::HasAlignmentPadding(JSFunction* function) { |
| // There is no dynamic alignment padding on x64 in the input frame. |
| return false; |
| } |
| |
| |
| #define __ masm()-> |
| |
| void Deoptimizer::EntryGenerator::Generate() { |
| GeneratePrologue(); |
| |
| // Save all general purpose registers before messing with them. |
| const int kNumberOfRegisters = Register::kNumRegisters; |
| |
| const int kDoubleRegsSize = kDoubleSize * |
| XMMRegister::NumAllocatableRegisters(); |
| __ subp(rsp, Immediate(kDoubleRegsSize)); |
| |
| for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) { |
| XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i); |
| int offset = i * kDoubleSize; |
| __ movsd(Operand(rsp, offset), xmm_reg); |
| } |
| |
| // We push all registers onto the stack, even though we do not need |
| // to restore all later. |
| for (int i = 0; i < kNumberOfRegisters; i++) { |
| Register r = Register::from_code(i); |
| __ pushq(r); |
| } |
| |
| const int kSavedRegistersAreaSize = kNumberOfRegisters * kRegisterSize + |
| kDoubleRegsSize; |
| |
| // We use this to keep the value of the fifth argument temporarily. |
| // Unfortunately we can't store it directly in r8 (used for passing |
| // this on linux), since it is another parameter passing register on windows. |
| Register arg5 = r11; |
| |
| // Get the bailout id from the stack. |
| __ movp(arg_reg_3, Operand(rsp, kSavedRegistersAreaSize)); |
| |
| // Get the address of the location in the code object |
| // and compute the fp-to-sp delta in register arg5. |
| __ movp(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize)); |
| __ leap(arg5, Operand(rsp, kSavedRegistersAreaSize + 1 * kRegisterSize + |
| kPCOnStackSize)); |
| |
| __ subp(arg5, rbp); |
| __ negp(arg5); |
| |
| // Allocate a new deoptimizer object. |
| __ PrepareCallCFunction(6); |
| __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset)); |
| __ movp(arg_reg_1, rax); |
| __ Set(arg_reg_2, type()); |
| // Args 3 and 4 are already in the right registers. |
| |
| // On windows put the arguments on the stack (PrepareCallCFunction |
| // has created space for this). On linux pass the arguments in r8 and r9. |
| #ifdef _WIN64 |
| __ movq(Operand(rsp, 4 * kRegisterSize), arg5); |
| __ LoadAddress(arg5, ExternalReference::isolate_address(isolate())); |
| __ movq(Operand(rsp, 5 * kRegisterSize), arg5); |
| #else |
| __ movp(r8, arg5); |
| __ LoadAddress(r9, ExternalReference::isolate_address(isolate())); |
| #endif |
| |
| { AllowExternalCallThatCantCauseGC scope(masm()); |
| __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6); |
| } |
| // Preserve deoptimizer object in register rax and get the input |
| // frame descriptor pointer. |
| __ movp(rbx, Operand(rax, Deoptimizer::input_offset())); |
| |
| // Fill in the input registers. |
| for (int i = kNumberOfRegisters -1; i >= 0; i--) { |
| int offset = (i * kPointerSize) + FrameDescription::registers_offset(); |
| __ PopQuad(Operand(rbx, offset)); |
| } |
| |
| // Fill in the double input registers. |
| int double_regs_offset = FrameDescription::double_registers_offset(); |
| for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); i++) { |
| int dst_offset = i * kDoubleSize + double_regs_offset; |
| __ popq(Operand(rbx, dst_offset)); |
| } |
| |
| // Remove the bailout id and return address from the stack. |
| __ addp(rsp, Immediate(1 * kRegisterSize + kPCOnStackSize)); |
| |
| // Compute a pointer to the unwinding limit in register rcx; that is |
| // the first stack slot not part of the input frame. |
| __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset())); |
| __ addp(rcx, rsp); |
| |
| // Unwind the stack down to - but not including - the unwinding |
| // limit and copy the contents of the activation frame to the input |
| // frame description. |
| __ leap(rdx, Operand(rbx, FrameDescription::frame_content_offset())); |
| Label pop_loop_header; |
| __ jmp(&pop_loop_header); |
| Label pop_loop; |
| __ bind(&pop_loop); |
| __ Pop(Operand(rdx, 0)); |
| __ addp(rdx, Immediate(sizeof(intptr_t))); |
| __ bind(&pop_loop_header); |
| __ cmpp(rcx, rsp); |
| __ j(not_equal, &pop_loop); |
| |
| // Compute the output frame in the deoptimizer. |
| __ pushq(rax); |
| __ PrepareCallCFunction(2); |
| __ movp(arg_reg_1, rax); |
| __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate())); |
| { |
| AllowExternalCallThatCantCauseGC scope(masm()); |
| __ CallCFunction( |
| ExternalReference::compute_output_frames_function(isolate()), 2); |
| } |
| __ popq(rax); |
| |
| // Replace the current frame with the output frames. |
| Label outer_push_loop, inner_push_loop, |
| outer_loop_header, inner_loop_header; |
| // Outer loop state: rax = current FrameDescription**, rdx = one past the |
| // last FrameDescription**. |
| __ movl(rdx, Operand(rax, Deoptimizer::output_count_offset())); |
| __ movp(rax, Operand(rax, Deoptimizer::output_offset())); |
| __ leap(rdx, Operand(rax, rdx, times_pointer_size, 0)); |
| __ jmp(&outer_loop_header); |
| __ bind(&outer_push_loop); |
| // Inner loop state: rbx = current FrameDescription*, rcx = loop index. |
| __ movp(rbx, Operand(rax, 0)); |
| __ movp(rcx, Operand(rbx, FrameDescription::frame_size_offset())); |
| __ jmp(&inner_loop_header); |
| __ bind(&inner_push_loop); |
| __ subp(rcx, Immediate(sizeof(intptr_t))); |
| __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset())); |
| __ bind(&inner_loop_header); |
| __ testp(rcx, rcx); |
| __ j(not_zero, &inner_push_loop); |
| __ addp(rax, Immediate(kPointerSize)); |
| __ bind(&outer_loop_header); |
| __ cmpp(rax, rdx); |
| __ j(below, &outer_push_loop); |
| |
| for (int i = 0; i < XMMRegister::NumAllocatableRegisters(); ++i) { |
| XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i); |
| int src_offset = i * kDoubleSize + double_regs_offset; |
| __ movsd(xmm_reg, Operand(rbx, src_offset)); |
| } |
| |
| // Push state, pc, and continuation from the last output frame. |
| __ Push(Operand(rbx, FrameDescription::state_offset())); |
| __ PushQuad(Operand(rbx, FrameDescription::pc_offset())); |
| __ PushQuad(Operand(rbx, FrameDescription::continuation_offset())); |
| |
| // Push the registers from the last output frame. |
| for (int i = 0; i < kNumberOfRegisters; i++) { |
| int offset = (i * kPointerSize) + FrameDescription::registers_offset(); |
| __ PushQuad(Operand(rbx, offset)); |
| } |
| |
| // Restore the registers from the stack. |
| for (int i = kNumberOfRegisters - 1; i >= 0 ; i--) { |
| Register r = Register::from_code(i); |
| // Do not restore rsp, simply pop the value into the next register |
| // and overwrite this afterwards. |
| if (r.is(rsp)) { |
| ASSERT(i > 0); |
| r = Register::from_code(i - 1); |
| } |
| __ popq(r); |
| } |
| |
| // Set up the roots register. |
| __ InitializeRootRegister(); |
| __ InitializeSmiConstantRegister(); |
| |
| // Return to the continuation point. |
| __ ret(0); |
| } |
| |
| |
| void Deoptimizer::TableEntryGenerator::GeneratePrologue() { |
| // Create a sequence of deoptimization entries. |
| Label done; |
| for (int i = 0; i < count(); i++) { |
| int start = masm()->pc_offset(); |
| USE(start); |
| __ pushq_imm32(i); |
| __ jmp(&done); |
| ASSERT(masm()->pc_offset() - start == table_entry_size_); |
| } |
| __ bind(&done); |
| } |
| |
| |
| void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) { |
| if (kPCOnStackSize == 2 * kPointerSize) { |
| // Zero out the high-32 bit of PC for x32 port. |
| SetFrameSlot(offset + kPointerSize, 0); |
| } |
| SetFrameSlot(offset, value); |
| } |
| |
| |
| void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) { |
| if (kFPOnStackSize == 2 * kPointerSize) { |
| // Zero out the high-32 bit of FP for x32 port. |
| SetFrameSlot(offset + kPointerSize, 0); |
| } |
| SetFrameSlot(offset, value); |
| } |
| |
| |
| void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) { |
| // No out-of-line constant pool support. |
| UNREACHABLE(); |
| } |
| |
| |
| #undef __ |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_X64 |