| // 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. |
| |
| #if V8_TARGET_ARCH_X64 |
| |
| #include "src/codegen/macro-assembler.h" |
| #include "src/codegen/register-configuration.h" |
| #include "src/codegen/safepoint-table.h" |
| #include "src/deoptimizer/deoptimizer.h" |
| #include "src/objects/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #define __ masm-> |
| |
| void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm, |
| Isolate* isolate, |
| DeoptimizeKind deopt_kind) { |
| NoRootArrayScope no_root_array(masm); |
| |
| // Save all general purpose registers before messing with them. |
| const int kNumberOfRegisters = Register::kNumRegisters; |
| |
| const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters; |
| __ AllocateStackSpace(kDoubleRegsSize); |
| |
| const RegisterConfiguration* config = RegisterConfiguration::Default(); |
| for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { |
| int code = config->GetAllocatableDoubleCode(i); |
| XMMRegister xmm_reg = XMMRegister::from_code(code); |
| int offset = code * kDoubleSize; |
| __ Movsd(Operand(rsp, offset), xmm_reg); |
| } |
| |
| const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters; |
| __ AllocateStackSpace(kFloatRegsSize); |
| |
| for (int i = 0; i < config->num_allocatable_float_registers(); ++i) { |
| int code = config->GetAllocatableFloatCode(i); |
| XMMRegister xmm_reg = XMMRegister::from_code(code); |
| int offset = code * kFloatSize; |
| __ Movss(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 * kSystemPointerSize + |
| kDoubleRegsSize + kFloatRegsSize; |
| |
| __ Store( |
| ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate), |
| rbp); |
| |
| // 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; |
| |
| // The bailout id is passed using r13 on the stack. |
| __ movq(arg_reg_3, r13); |
| |
| // Get the address of the location in the code object |
| // and compute the fp-to-sp delta in register arg5. |
| __ movq(arg_reg_4, Operand(rsp, kSavedRegistersAreaSize)); |
| __ leaq(arg5, Operand(rsp, kSavedRegistersAreaSize + kPCOnStackSize)); |
| |
| __ subq(arg5, rbp); |
| __ negq(arg5); |
| |
| // Allocate a new deoptimizer object. |
| __ PrepareCallCFunction(6); |
| __ movq(rax, Immediate(0)); |
| Label context_check; |
| __ movq(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset)); |
| __ JumpIfSmi(rdi, &context_check); |
| __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset)); |
| __ bind(&context_check); |
| __ movq(arg_reg_1, rax); |
| __ Set(arg_reg_2, static_cast<int>(deopt_kind)); |
| // 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 V8_TARGET_OS_WIN |
| __ movq(Operand(rsp, 4 * kSystemPointerSize), arg5); |
| __ LoadAddress(arg5, ExternalReference::isolate_address(isolate)); |
| __ movq(Operand(rsp, 5 * kSystemPointerSize), arg5); |
| #else |
| __ movq(r8, arg5); |
| __ LoadAddress(r9, ExternalReference::isolate_address(isolate)); |
| #endif |
| |
| { |
| AllowExternalCallThatCantCauseGC scope(masm); |
| __ CallCFunction(ExternalReference::new_deoptimizer_function(), 6); |
| } |
| // Preserve deoptimizer object in register rax and get the input |
| // frame descriptor pointer. |
| __ movq(rbx, Operand(rax, Deoptimizer::input_offset())); |
| |
| // Fill in the input registers. |
| for (int i = kNumberOfRegisters - 1; i >= 0; i--) { |
| int offset = |
| (i * kSystemPointerSize) + FrameDescription::registers_offset(); |
| __ PopQuad(Operand(rbx, offset)); |
| } |
| |
| // Fill in the float input registers. |
| int float_regs_offset = FrameDescription::float_registers_offset(); |
| for (int i = 0; i < XMMRegister::kNumRegisters; i++) { |
| int src_offset = i * kFloatSize; |
| int dst_offset = i * kFloatSize + float_regs_offset; |
| __ movl(rcx, Operand(rsp, src_offset)); |
| __ movl(Operand(rbx, dst_offset), rcx); |
| } |
| __ addq(rsp, Immediate(kFloatRegsSize)); |
| |
| // Fill in the double input registers. |
| int double_regs_offset = FrameDescription::double_registers_offset(); |
| for (int i = 0; i < XMMRegister::kNumRegisters; i++) { |
| int dst_offset = i * kDoubleSize + double_regs_offset; |
| __ popq(Operand(rbx, dst_offset)); |
| } |
| |
| // Mark the stack as not iterable for the CPU profiler which won't be able to |
| // walk the stack without the return address. |
| __ movb(__ ExternalReferenceAsOperand( |
| ExternalReference::stack_is_iterable_address(isolate)), |
| Immediate(0)); |
| |
| // Remove the return address from the stack. |
| __ addq(rsp, Immediate(kPCOnStackSize)); |
| |
| // Compute a pointer to the unwinding limit in register rcx; that is |
| // the first stack slot not part of the input frame. |
| __ movq(rcx, Operand(rbx, FrameDescription::frame_size_offset())); |
| __ addq(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. |
| __ leaq(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)); |
| __ addq(rdx, Immediate(sizeof(intptr_t))); |
| __ bind(&pop_loop_header); |
| __ cmpq(rcx, rsp); |
| __ j(not_equal, &pop_loop); |
| |
| // Compute the output frame in the deoptimizer. |
| __ pushq(rax); |
| __ PrepareCallCFunction(2); |
| __ movq(arg_reg_1, rax); |
| __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate)); |
| { |
| AllowExternalCallThatCantCauseGC scope(masm); |
| __ CallCFunction(ExternalReference::compute_output_frames_function(), 2); |
| } |
| __ popq(rax); |
| |
| __ movq(rsp, Operand(rax, Deoptimizer::caller_frame_top_offset())); |
| |
| // Replace the current (input) 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())); |
| __ movq(rax, Operand(rax, Deoptimizer::output_offset())); |
| __ leaq(rdx, Operand(rax, rdx, times_system_pointer_size, 0)); |
| __ jmp(&outer_loop_header); |
| __ bind(&outer_push_loop); |
| // Inner loop state: rbx = current FrameDescription*, rcx = loop index. |
| __ movq(rbx, Operand(rax, 0)); |
| __ movq(rcx, Operand(rbx, FrameDescription::frame_size_offset())); |
| __ jmp(&inner_loop_header); |
| __ bind(&inner_push_loop); |
| __ subq(rcx, Immediate(sizeof(intptr_t))); |
| __ Push(Operand(rbx, rcx, times_1, FrameDescription::frame_content_offset())); |
| __ bind(&inner_loop_header); |
| __ testq(rcx, rcx); |
| __ j(not_zero, &inner_push_loop); |
| __ addq(rax, Immediate(kSystemPointerSize)); |
| __ bind(&outer_loop_header); |
| __ cmpq(rax, rdx); |
| __ j(below, &outer_push_loop); |
| |
| for (int i = 0; i < config->num_allocatable_double_registers(); ++i) { |
| int code = config->GetAllocatableDoubleCode(i); |
| XMMRegister xmm_reg = XMMRegister::from_code(code); |
| int src_offset = code * kDoubleSize + double_regs_offset; |
| __ Movsd(xmm_reg, Operand(rbx, src_offset)); |
| } |
| |
| // Push pc and continuation from the last output frame. |
| __ 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 * kSystemPointerSize) + 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 == rsp) { |
| DCHECK_GT(i, 0); |
| r = Register::from_code(i - 1); |
| } |
| __ popq(r); |
| } |
| |
| __ movb(__ ExternalReferenceAsOperand( |
| ExternalReference::stack_is_iterable_address(isolate)), |
| Immediate(1)); |
| |
| // Return to the continuation point. |
| __ ret(0); |
| } |
| |
| bool Deoptimizer::PadTopOfStackRegister() { return false; } |
| |
| void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) { |
| if (kPCOnStackSize == 2 * kSystemPointerSize) { |
| // Zero out the high-32 bit of PC for x32 port. |
| SetFrameSlot(offset + kSystemPointerSize, 0); |
| } |
| SetFrameSlot(offset, value); |
| } |
| |
| void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) { |
| if (kFPOnStackSize == 2 * kSystemPointerSize) { |
| // Zero out the high-32 bit of FP for x32 port. |
| SetFrameSlot(offset + kSystemPointerSize, 0); |
| } |
| SetFrameSlot(offset, value); |
| } |
| |
| void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) { |
| // No embedded constant pool support. |
| UNREACHABLE(); |
| } |
| |
| #undef __ |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_TARGET_ARCH_X64 |