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// Copyright 2014 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/codegen/macro-assembler.h"
#include "src/codegen/register-configuration.h"
#include "src/codegen/safepoint-table.h"
#include "src/deoptimizer/deoptimizer.h"
namespace v8 {
namespace internal {
#define __ masm->
// This code tries to be close to ia32 code so that any changes can be
// easily ported.
void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
Isolate* isolate,
DeoptimizeKind deopt_kind) {
NoRootArrayScope no_root_array(masm);
// Save all the registers onto the stack
const int kNumberOfRegisters = Register::kNumRegisters;
RegList restored_regs = kJSCallerSaved | kCalleeSaved;
const int kDoubleRegsSize = kDoubleSize * DoubleRegister::kNumRegisters;
const int kFloatRegsSize = kFloatSize * FloatRegister::kNumRegisters;
// Save all double registers before messing with them.
__ lay(sp, MemOperand(sp, -kDoubleRegsSize));
const RegisterConfiguration* config = RegisterConfiguration::Default();
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
const DoubleRegister dreg = DoubleRegister::from_code(code);
int offset = code * kDoubleSize;
__ StoreDouble(dreg, MemOperand(sp, offset));
}
// Save all float registers before messing with them.
__ lay(sp, MemOperand(sp, -kFloatRegsSize));
for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
int code = config->GetAllocatableFloatCode(i);
const FloatRegister dreg = FloatRegister::from_code(code);
int offset = code * kFloatSize;
__ StoreFloat32(dreg, MemOperand(sp, offset));
}
// Push all GPRs onto the stack
__ lay(sp, MemOperand(sp, -kNumberOfRegisters * kPointerSize));
__ StoreMultipleP(r0, sp, MemOperand(sp)); // Save all 16 registers
__ mov(r1, Operand(ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, isolate)));
__ StoreP(fp, MemOperand(r1));
const int kSavedRegistersAreaSize =
(kNumberOfRegisters * kPointerSize) + kDoubleRegsSize + kFloatRegsSize;
// The bailout id is passed using r10
__ LoadRR(r4, r10);
// Cleanse the Return address for 31-bit
__ CleanseP(r14);
// Get the address of the location in the code object (r5)(return
// address for lazy deoptimization) and compute the fp-to-sp delta in
// register r6.
__ LoadRR(r5, r14);
__ la(r6, MemOperand(sp, kSavedRegistersAreaSize));
__ SubP(r6, fp, r6);
// Allocate a new deoptimizer object.
// Pass six arguments in r2 to r7.
__ PrepareCallCFunction(6, r7);
__ LoadImmP(r2, Operand::Zero());
Label context_check;
__ LoadP(r3, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
__ JumpIfSmi(r3, &context_check);
__ LoadP(r2, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
__ bind(&context_check);
__ LoadImmP(r3, Operand(static_cast<int>(deopt_kind)));
// r4: bailout id already loaded.
// r5: code address or 0 already loaded.
// r6: Fp-to-sp delta.
// Parm6: isolate is passed on the stack.
__ mov(r7, Operand(ExternalReference::isolate_address(isolate)));
__ StoreP(r7, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize));
// Call Deoptimizer::New().
{
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
}
// Preserve "deoptimizer" object in register r2 and get the input
// frame descriptor pointer to r3 (deoptimizer->input_);
__ LoadP(r3, MemOperand(r2, Deoptimizer::input_offset()));
// Copy core registers into FrameDescription::registers_[kNumRegisters].
// DCHECK_EQ(Register::kNumRegisters, kNumberOfRegisters);
// __ mvc(MemOperand(r3, FrameDescription::registers_offset()),
// MemOperand(sp), kNumberOfRegisters * kPointerSize);
// Copy core registers into FrameDescription::registers_[kNumRegisters].
// TODO(john.yan): optimize the following code by using mvc instruction
DCHECK_EQ(Register::kNumRegisters, kNumberOfRegisters);
for (int i = 0; i < kNumberOfRegisters; i++) {
int offset = (i * kPointerSize) + FrameDescription::registers_offset();
__ LoadP(r4, MemOperand(sp, i * kPointerSize));
__ StoreP(r4, MemOperand(r3, offset));
}
int double_regs_offset = FrameDescription::double_registers_offset();
// Copy double registers to
// double_registers_[DoubleRegister::kNumRegisters]
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
int dst_offset = code * kDoubleSize + double_regs_offset;
int src_offset =
code * kDoubleSize + kNumberOfRegisters * kPointerSize + kFloatRegsSize;
// TODO(joransiu): MVC opportunity
__ LoadDouble(d0, MemOperand(sp, src_offset));
__ StoreDouble(d0, MemOperand(r3, dst_offset));
}
int float_regs_offset = FrameDescription::float_registers_offset();
// Copy float registers to
// float_registers_[FloatRegister::kNumRegisters]
for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
int code = config->GetAllocatableFloatCode(i);
int dst_offset = code * kFloatSize + float_regs_offset;
int src_offset = code * kFloatSize + kNumberOfRegisters * kPointerSize;
// TODO(joransiu): MVC opportunity
__ LoadFloat32(d0, MemOperand(sp, src_offset));
__ StoreFloat32(d0, MemOperand(r3, dst_offset));
}
// Remove the saved registers from the stack.
__ la(sp, MemOperand(sp, kSavedRegistersAreaSize));
// Compute a pointer to the unwinding limit in register r4; that is
// the first stack slot not part of the input frame.
__ LoadP(r4, MemOperand(r3, FrameDescription::frame_size_offset()));
__ AddP(r4, sp);
// Unwind the stack down to - but not including - the unwinding
// limit and copy the contents of the activation frame to the input
// frame description.
__ la(r5, MemOperand(r3, FrameDescription::frame_content_offset()));
Label pop_loop;
Label pop_loop_header;
__ b(&pop_loop_header, Label::kNear);
__ bind(&pop_loop);
__ pop(r6);
__ StoreP(r6, MemOperand(r5, 0));
__ la(r5, MemOperand(r5, kPointerSize));
__ bind(&pop_loop_header);
__ CmpP(r4, sp);
__ bne(&pop_loop);
// Compute the output frame in the deoptimizer.
__ push(r2); // Preserve deoptimizer object across call.
// r2: deoptimizer object; r3: scratch.
__ PrepareCallCFunction(1, r3);
// Call Deoptimizer::ComputeOutputFrames().
{
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(ExternalReference::compute_output_frames_function(), 1);
}
__ pop(r2); // Restore deoptimizer object (class Deoptimizer).
__ LoadP(sp, MemOperand(r2, 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: r6 = current "FrameDescription** output_",
// r3 = one past the last FrameDescription**.
__ LoadlW(r3, MemOperand(r2, Deoptimizer::output_count_offset()));
__ LoadP(r6, MemOperand(r2, Deoptimizer::output_offset())); // r6 is output_.
__ ShiftLeftP(r3, r3, Operand(kPointerSizeLog2));
__ AddP(r3, r6, r3);
__ b(&outer_loop_header, Label::kNear);
__ bind(&outer_push_loop);
// Inner loop state: r4 = current FrameDescription*, r5 = loop index.
__ LoadP(r4, MemOperand(r6, 0)); // output_[ix]
__ LoadP(r5, MemOperand(r4, FrameDescription::frame_size_offset()));
__ b(&inner_loop_header, Label::kNear);
__ bind(&inner_push_loop);
__ SubP(r5, Operand(sizeof(intptr_t)));
__ AddP(r8, r4, r5);
__ LoadP(r8, MemOperand(r8, FrameDescription::frame_content_offset()));
__ push(r8);
__ bind(&inner_loop_header);
__ CmpP(r5, Operand::Zero());
__ bne(&inner_push_loop); // test for gt?
__ AddP(r6, r6, Operand(kPointerSize));
__ bind(&outer_loop_header);
__ CmpP(r6, r3);
__ blt(&outer_push_loop);
__ LoadP(r3, MemOperand(r2, Deoptimizer::input_offset()));
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
int code = config->GetAllocatableDoubleCode(i);
const DoubleRegister dreg = DoubleRegister::from_code(code);
int src_offset = code * kDoubleSize + double_regs_offset;
__ ld(dreg, MemOperand(r3, src_offset));
}
// Push pc and continuation from the last output frame.
__ LoadP(r8, MemOperand(r4, FrameDescription::pc_offset()));
__ push(r8);
__ LoadP(r8, MemOperand(r4, FrameDescription::continuation_offset()));
__ push(r8);
// Restore the registers from the last output frame.
__ LoadRR(r1, r4);
for (int i = kNumberOfRegisters - 1; i > 0; i--) {
int offset = (i * kPointerSize) + FrameDescription::registers_offset();
if ((restored_regs & (1 << i)) != 0) {
__ LoadP(ToRegister(i), MemOperand(r1, offset));
}
}
__ pop(ip); // get continuation, leave pc on stack
__ pop(r14);
__ Jump(ip);
__ stop("Unreachable.");
}
bool Deoptimizer::PadTopOfStackRegister() { return false; }
void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
SetFrameSlot(offset, value);
}
void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
SetFrameSlot(offset, value);
}
void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
// No out-of-line constant pool support.
UNREACHABLE();
}
#undef __
} // namespace internal
} // namespace v8
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