src/x64/deoptimizer-x64.cc - v8/v8 - Git at Google

 // 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/deoptimizer.h"
 #include "src/macro-assembler.h"
 #include "src/objects-inl.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"

 namespace v8 {
 namespace internal {

 const int Deoptimizer::table_entry_size_ = 5;

 #define __ masm->

 void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
                                                 Isolate* isolate, int count,
                                                 DeoptimizeKind deopt_kind) {
   NoRootArrayScope no_root_array(masm);
   Label deopt_table_entry;
   __ bind(&deopt_table_entry);

   GenerateDeoptimizationEntriesPrologue(masm, count);

   // Save all general purpose registers before messing with them.
   const int kNumberOfRegisters = Register::kNumRegisters;

   const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters;
   __ subp(rsp, Immediate(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;
   __ subp(rsp, Immediate(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 * kRegisterSize + 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;

   // Get the bailout id from the stack.
   __ movp(rax, Operand(rsp, kSavedRegistersAreaSize));

   // address of deoptimization table
   __ leap(rdx, Operand(&deopt_table_entry));

   // rax = deopt_entry - deopt_table_entry - 5
   __ subp(rax, rdx);
   __ subl(rax, Immediate(5));

   // rax /= 5
   __ movl(rbx, Immediate(0xcccccccd));
   __ imulq(rax, rbx);
   __ shrq(rax, Immediate(0x22));

   // bailout id
   __ movl(arg_reg_3, rax);

   // 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, Immediate(0));
   Label context_check;
   __ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
   __ JumpIfSmi(rdi, &context_check);
   __ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ bind(&context_check);
   __ movp(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 _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(), 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 * kRegisterSize) + 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);
   }
   __ addp(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));
   }

   // 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(), 2);
   }
   __ popq(rax);

   __ movp(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()));
   __ 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(kSystemPointerSize));
   __ bind(&outer_loop_header);
   __ cmpp(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 * kRegisterSize) + 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);
   }

   // Return to the continuation point.
   __ ret(0);
 }

 void Deoptimizer::GenerateDeoptimizationEntriesPrologue(MacroAssembler* masm,
                                                         int count) {
   // Create a sequence of deoptimization entries.
   Label done;
   for (int i = 0; i < count; i++) {
     int start = masm->pc_offset();
     USE(start);
     __ call(&done);
     DCHECK(masm->pc_offset() - start == table_entry_size_);
   }
   __ bind(&done);
 }

 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
	// 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/deoptimizer.h"
	#include "src/macro-assembler.h"
	#include "src/objects-inl.h"
	#include "src/register-configuration.h"
	#include "src/safepoint-table.h"

	namespace v8 {
	namespace internal {

	const int Deoptimizer::table_entry_size_ = 5;

	#define __ masm->

	void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
	Isolate* isolate, int count,
	DeoptimizeKind deopt_kind) {
	NoRootArrayScope no_root_array(masm);
	Label deopt_table_entry;
	__ bind(&deopt_table_entry);

	GenerateDeoptimizationEntriesPrologue(masm, count);

	// Save all general purpose registers before messing with them.
	const int kNumberOfRegisters = Register::kNumRegisters;

	const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters;
	__ subp(rsp, Immediate(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;
	__ subp(rsp, Immediate(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 * kRegisterSize + 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;

	// Get the bailout id from the stack.
	__ movp(rax, Operand(rsp, kSavedRegistersAreaSize));

	// address of deoptimization table
	__ leap(rdx, Operand(&deopt_table_entry));

	// rax = deopt_entry - deopt_table_entry - 5
	__ subp(rax, rdx);
	__ subl(rax, Immediate(5));

	// rax /= 5
	__ movl(rbx, Immediate(0xcccccccd));
	__ imulq(rax, rbx);
	__ shrq(rax, Immediate(0x22));

	// bailout id
	__ movl(arg_reg_3, rax);

	// 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, Immediate(0));
	Label context_check;
	__ movp(rdi, Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset));
	__ JumpIfSmi(rdi, &context_check);
	__ movp(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
	__ bind(&context_check);
	__ movp(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 _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(), 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 * kRegisterSize) + 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);
	}
	__ addp(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));
	}

	// 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(), 2);
	}
	__ popq(rax);

	__ movp(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()));
	__ 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(kSystemPointerSize));
	__ bind(&outer_loop_header);
	__ cmpp(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 * kRegisterSize) + 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);
	}

	// Return to the continuation point.
	__ ret(0);
	}

	void Deoptimizer::GenerateDeoptimizationEntriesPrologue(MacroAssembler* masm,
	int count) {
	// Create a sequence of deoptimization entries.
	Label done;
	for (int i = 0; i < count; i++) {
	int start = masm->pc_offset();
	USE(start);
	__ call(&done);
	DCHECK(masm->pc_offset() - start == table_entry_size_);
	}
	__ bind(&done);
	}

	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