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code-generator-ppc.cc
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code-generator-ppc.cc
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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/assembler-inl.h"
#include "src/codegen/callable.h"
#include "src/codegen/macro-assembler.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/backend/code-generator-impl.h"
#include "src/compiler/backend/code-generator.h"
#include "src/compiler/backend/gap-resolver.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/osr.h"
#include "src/heap/memory-chunk.h"
#include "src/numbers/double.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
namespace compiler {
#define __ tasm()->
#define kScratchReg r11
// Adds PPC-specific methods to convert InstructionOperands.
class PPCOperandConverter final : public InstructionOperandConverter {
public:
PPCOperandConverter(CodeGenerator* gen, Instruction* instr)
: InstructionOperandConverter(gen, instr) {}
size_t OutputCount() { return instr_->OutputCount(); }
RCBit OutputRCBit() const {
switch (instr_->flags_mode()) {
case kFlags_branch:
case kFlags_branch_and_poison:
case kFlags_deoptimize:
case kFlags_deoptimize_and_poison:
case kFlags_set:
case kFlags_trap:
return SetRC;
case kFlags_none:
return LeaveRC;
}
UNREACHABLE();
}
bool CompareLogical() const {
switch (instr_->flags_condition()) {
case kUnsignedLessThan:
case kUnsignedGreaterThanOrEqual:
case kUnsignedLessThanOrEqual:
case kUnsignedGreaterThan:
return true;
default:
return false;
}
UNREACHABLE();
}
Operand InputImmediate(size_t index) {
Constant constant = ToConstant(instr_->InputAt(index));
switch (constant.type()) {
case Constant::kInt32:
return Operand(constant.ToInt32());
case Constant::kFloat32:
return Operand::EmbeddedNumber(constant.ToFloat32());
case Constant::kFloat64:
return Operand::EmbeddedNumber(constant.ToFloat64().value());
case Constant::kInt64:
#if V8_TARGET_ARCH_PPC64
return Operand(constant.ToInt64());
#endif
case Constant::kExternalReference:
return Operand(constant.ToExternalReference());
case Constant::kDelayedStringConstant:
return Operand::EmbeddedStringConstant(
constant.ToDelayedStringConstant());
case Constant::kCompressedHeapObject:
case Constant::kHeapObject:
case Constant::kRpoNumber:
break;
}
UNREACHABLE();
}
MemOperand MemoryOperand(AddressingMode* mode, size_t* first_index) {
const size_t index = *first_index;
AddressingMode addr_mode = AddressingModeField::decode(instr_->opcode());
if (mode) *mode = addr_mode;
switch (addr_mode) {
case kMode_None:
break;
case kMode_MRI:
*first_index += 2;
return MemOperand(InputRegister(index + 0), InputInt32(index + 1));
case kMode_MRR:
*first_index += 2;
return MemOperand(InputRegister(index + 0), InputRegister(index + 1));
}
UNREACHABLE();
}
MemOperand MemoryOperand(AddressingMode* mode = NULL,
size_t first_index = 0) {
return MemoryOperand(mode, &first_index);
}
MemOperand ToMemOperand(InstructionOperand* op) const {
DCHECK_NOT_NULL(op);
DCHECK(op->IsStackSlot() || op->IsFPStackSlot());
return SlotToMemOperand(AllocatedOperand::cast(op)->index());
}
MemOperand SlotToMemOperand(int slot) const {
FrameOffset offset = frame_access_state()->GetFrameOffset(slot);
return MemOperand(offset.from_stack_pointer() ? sp : fp, offset.offset());
}
};
static inline bool HasRegisterInput(Instruction* instr, size_t index) {
return instr->InputAt(index)->IsRegister();
}
namespace {
class OutOfLineRecordWrite final : public OutOfLineCode {
public:
OutOfLineRecordWrite(CodeGenerator* gen, Register object, Register offset,
Register value, Register scratch0, Register scratch1,
RecordWriteMode mode, StubCallMode stub_mode,
UnwindingInfoWriter* unwinding_info_writer)
: OutOfLineCode(gen),
object_(object),
offset_(offset),
offset_immediate_(0),
value_(value),
scratch0_(scratch0),
scratch1_(scratch1),
mode_(mode),
stub_mode_(stub_mode),
must_save_lr_(!gen->frame_access_state()->has_frame()),
unwinding_info_writer_(unwinding_info_writer),
zone_(gen->zone()) {}
OutOfLineRecordWrite(CodeGenerator* gen, Register object, int32_t offset,
Register value, Register scratch0, Register scratch1,
RecordWriteMode mode, StubCallMode stub_mode,
UnwindingInfoWriter* unwinding_info_writer)
: OutOfLineCode(gen),
object_(object),
offset_(no_reg),
offset_immediate_(offset),
value_(value),
scratch0_(scratch0),
scratch1_(scratch1),
mode_(mode),
stub_mode_(stub_mode),
must_save_lr_(!gen->frame_access_state()->has_frame()),
unwinding_info_writer_(unwinding_info_writer),
zone_(gen->zone()) {}
void Generate() final {
ConstantPoolUnavailableScope constant_pool_unavailable(tasm());
if (mode_ > RecordWriteMode::kValueIsPointer) {
__ JumpIfSmi(value_, exit());
}
if (COMPRESS_POINTERS_BOOL) {
__ DecompressTaggedPointer(value_, value_);
}
__ CheckPageFlag(value_, scratch0_,
MemoryChunk::kPointersToHereAreInterestingMask, eq,
exit());
if (offset_ == no_reg) {
__ addi(scratch1_, object_, Operand(offset_immediate_));
} else {
DCHECK_EQ(0, offset_immediate_);
__ add(scratch1_, object_, offset_);
}
RememberedSetAction const remembered_set_action =
mode_ > RecordWriteMode::kValueIsMap ? EMIT_REMEMBERED_SET
: OMIT_REMEMBERED_SET;
SaveFPRegsMode const save_fp_mode =
frame()->DidAllocateDoubleRegisters() ? kSaveFPRegs : kDontSaveFPRegs;
if (must_save_lr_) {
// We need to save and restore lr if the frame was elided.
__ mflr(scratch0_);
__ Push(scratch0_);
unwinding_info_writer_->MarkLinkRegisterOnTopOfStack(__ pc_offset());
}
if (mode_ == RecordWriteMode::kValueIsEphemeronKey) {
__ CallEphemeronKeyBarrier(object_, scratch1_, save_fp_mode);
} else if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
__ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
save_fp_mode, wasm::WasmCode::kRecordWrite);
} else {
__ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
save_fp_mode);
}
if (must_save_lr_) {
// We need to save and restore lr if the frame was elided.
__ Pop(scratch0_);
__ mtlr(scratch0_);
unwinding_info_writer_->MarkPopLinkRegisterFromTopOfStack(__ pc_offset());
}
}
private:
Register const object_;
Register const offset_;
int32_t const offset_immediate_; // Valid if offset_ == no_reg.
Register const value_;
Register const scratch0_;
Register const scratch1_;
RecordWriteMode const mode_;
StubCallMode stub_mode_;
bool must_save_lr_;
UnwindingInfoWriter* const unwinding_info_writer_;
Zone* zone_;
};
Condition FlagsConditionToCondition(FlagsCondition condition, ArchOpcode op) {
switch (condition) {
case kEqual:
return eq;
case kNotEqual:
return ne;
case kSignedLessThan:
case kUnsignedLessThan:
return lt;
case kSignedGreaterThanOrEqual:
case kUnsignedGreaterThanOrEqual:
return ge;
case kSignedLessThanOrEqual:
case kUnsignedLessThanOrEqual:
return le;
case kSignedGreaterThan:
case kUnsignedGreaterThan:
return gt;
case kOverflow:
// Overflow checked for add/sub only.
switch (op) {
#if V8_TARGET_ARCH_PPC64
case kPPC_Add32:
case kPPC_Add64:
case kPPC_Sub:
#endif
case kPPC_AddWithOverflow32:
case kPPC_SubWithOverflow32:
return lt;
default:
break;
}
break;
case kNotOverflow:
switch (op) {
#if V8_TARGET_ARCH_PPC64
case kPPC_Add32:
case kPPC_Add64:
case kPPC_Sub:
#endif
case kPPC_AddWithOverflow32:
case kPPC_SubWithOverflow32:
return ge;
default:
break;
}
break;
default:
break;
}
UNREACHABLE();
}
void EmitWordLoadPoisoningIfNeeded(CodeGenerator* codegen, Instruction* instr,
PPCOperandConverter const& i) {
const MemoryAccessMode access_mode =
static_cast<MemoryAccessMode>(MiscField::decode(instr->opcode()));
if (access_mode == kMemoryAccessPoisoned) {
Register value = i.OutputRegister();
codegen->tasm()->and_(value, value, kSpeculationPoisonRegister);
}
}
} // namespace
#define ASSEMBLE_FLOAT_UNOP_RC(asm_instr, round) \
do { \
__ asm_instr(i.OutputDoubleRegister(), i.InputDoubleRegister(0), \
i.OutputRCBit()); \
if (round) { \
__ frsp(i.OutputDoubleRegister(), i.OutputDoubleRegister()); \
} \
} while (0)
#define ASSEMBLE_FLOAT_BINOP_RC(asm_instr, round) \
do { \
__ asm_instr(i.OutputDoubleRegister(), i.InputDoubleRegister(0), \
i.InputDoubleRegister(1), i.OutputRCBit()); \
if (round) { \
__ frsp(i.OutputDoubleRegister(), i.OutputDoubleRegister()); \
} \
} while (0)
#define ASSEMBLE_BINOP(asm_instr_reg, asm_instr_imm) \
do { \
if (HasRegisterInput(instr, 1)) { \
__ asm_instr_reg(i.OutputRegister(), i.InputRegister(0), \
i.InputRegister(1)); \
} else { \
__ asm_instr_imm(i.OutputRegister(), i.InputRegister(0), \
i.InputImmediate(1)); \
} \
} while (0)
#define ASSEMBLE_BINOP_RC(asm_instr_reg, asm_instr_imm) \
do { \
if (HasRegisterInput(instr, 1)) { \
__ asm_instr_reg(i.OutputRegister(), i.InputRegister(0), \
i.InputRegister(1), i.OutputRCBit()); \
} else { \
__ asm_instr_imm(i.OutputRegister(), i.InputRegister(0), \
i.InputImmediate(1), i.OutputRCBit()); \
} \
} while (0)
#define ASSEMBLE_BINOP_INT_RC(asm_instr_reg, asm_instr_imm) \
do { \
if (HasRegisterInput(instr, 1)) { \
__ asm_instr_reg(i.OutputRegister(), i.InputRegister(0), \
i.InputRegister(1), i.OutputRCBit()); \
} else { \
__ asm_instr_imm(i.OutputRegister(), i.InputRegister(0), \
i.InputInt32(1), i.OutputRCBit()); \
} \
} while (0)
#define ASSEMBLE_ADD_WITH_OVERFLOW() \
do { \
if (HasRegisterInput(instr, 1)) { \
__ AddAndCheckForOverflow(i.OutputRegister(), i.InputRegister(0), \
i.InputRegister(1), kScratchReg, r0); \
} else { \
__ AddAndCheckForOverflow(i.OutputRegister(), i.InputRegister(0), \
i.InputInt32(1), kScratchReg, r0); \
} \
} while (0)
#define ASSEMBLE_SUB_WITH_OVERFLOW() \
do { \
if (HasRegisterInput(instr, 1)) { \
__ SubAndCheckForOverflow(i.OutputRegister(), i.InputRegister(0), \
i.InputRegister(1), kScratchReg, r0); \
} else { \
__ AddAndCheckForOverflow(i.OutputRegister(), i.InputRegister(0), \
-i.InputInt32(1), kScratchReg, r0); \
} \
} while (0)
#if V8_TARGET_ARCH_PPC64
#define ASSEMBLE_ADD_WITH_OVERFLOW32() \
do { \
ASSEMBLE_ADD_WITH_OVERFLOW(); \
__ extsw(kScratchReg, kScratchReg, SetRC); \
} while (0)
#define ASSEMBLE_SUB_WITH_OVERFLOW32() \
do { \
ASSEMBLE_SUB_WITH_OVERFLOW(); \
__ extsw(kScratchReg, kScratchReg, SetRC); \
} while (0)
#else
#define ASSEMBLE_ADD_WITH_OVERFLOW32 ASSEMBLE_ADD_WITH_OVERFLOW
#define ASSEMBLE_SUB_WITH_OVERFLOW32 ASSEMBLE_SUB_WITH_OVERFLOW
#endif
#define ASSEMBLE_COMPARE(cmp_instr, cmpl_instr) \
do { \
const CRegister cr = cr0; \
if (HasRegisterInput(instr, 1)) { \
if (i.CompareLogical()) { \
__ cmpl_instr(i.InputRegister(0), i.InputRegister(1), cr); \
} else { \
__ cmp_instr(i.InputRegister(0), i.InputRegister(1), cr); \
} \
} else { \
if (i.CompareLogical()) { \
__ cmpl_instr##i(i.InputRegister(0), i.InputImmediate(1), cr); \
} else { \
__ cmp_instr##i(i.InputRegister(0), i.InputImmediate(1), cr); \
} \
} \
DCHECK_EQ(SetRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_FLOAT_COMPARE(cmp_instr) \
do { \
const CRegister cr = cr0; \
__ cmp_instr(i.InputDoubleRegister(0), i.InputDoubleRegister(1), cr); \
DCHECK_EQ(SetRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_MODULO(div_instr, mul_instr) \
do { \
const Register scratch = kScratchReg; \
__ div_instr(scratch, i.InputRegister(0), i.InputRegister(1)); \
__ mul_instr(scratch, scratch, i.InputRegister(1)); \
__ sub(i.OutputRegister(), i.InputRegister(0), scratch, LeaveOE, \
i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_FLOAT_MODULO() \
do { \
FrameScope scope(tasm(), StackFrame::MANUAL); \
__ PrepareCallCFunction(0, 2, kScratchReg); \
__ MovToFloatParameters(i.InputDoubleRegister(0), \
i.InputDoubleRegister(1)); \
__ CallCFunction(ExternalReference::mod_two_doubles_operation(), 0, 2); \
__ MovFromFloatResult(i.OutputDoubleRegister()); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_IEEE754_UNOP(name) \
do { \
/* TODO(bmeurer): We should really get rid of this special instruction, */ \
/* and generate a CallAddress instruction instead. */ \
FrameScope scope(tasm(), StackFrame::MANUAL); \
__ PrepareCallCFunction(0, 1, kScratchReg); \
__ MovToFloatParameter(i.InputDoubleRegister(0)); \
__ CallCFunction(ExternalReference::ieee754_##name##_function(), 0, 1); \
/* Move the result in the double result register. */ \
__ MovFromFloatResult(i.OutputDoubleRegister()); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_IEEE754_BINOP(name) \
do { \
/* TODO(bmeurer): We should really get rid of this special instruction, */ \
/* and generate a CallAddress instruction instead. */ \
FrameScope scope(tasm(), StackFrame::MANUAL); \
__ PrepareCallCFunction(0, 2, kScratchReg); \
__ MovToFloatParameters(i.InputDoubleRegister(0), \
i.InputDoubleRegister(1)); \
__ CallCFunction(ExternalReference::ieee754_##name##_function(), 0, 2); \
/* Move the result in the double result register. */ \
__ MovFromFloatResult(i.OutputDoubleRegister()); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_FLOAT_MAX() \
do { \
DoubleRegister left_reg = i.InputDoubleRegister(0); \
DoubleRegister right_reg = i.InputDoubleRegister(1); \
DoubleRegister result_reg = i.OutputDoubleRegister(); \
Label check_nan_left, check_zero, return_left, return_right, done; \
__ fcmpu(left_reg, right_reg); \
__ bunordered(&check_nan_left); \
__ beq(&check_zero); \
__ bge(&return_left); \
__ b(&return_right); \
\
__ bind(&check_zero); \
__ fcmpu(left_reg, kDoubleRegZero); \
/* left == right != 0. */ \
__ bne(&return_left); \
/* At this point, both left and right are either 0 or -0. */ \
__ fadd(result_reg, left_reg, right_reg); \
__ b(&done); \
\
__ bind(&check_nan_left); \
__ fcmpu(left_reg, left_reg); \
/* left == NaN. */ \
__ bunordered(&return_left); \
__ bind(&return_right); \
if (right_reg != result_reg) { \
__ fmr(result_reg, right_reg); \
} \
__ b(&done); \
\
__ bind(&return_left); \
if (left_reg != result_reg) { \
__ fmr(result_reg, left_reg); \
} \
__ bind(&done); \
} while (0)
#define ASSEMBLE_FLOAT_MIN() \
do { \
DoubleRegister left_reg = i.InputDoubleRegister(0); \
DoubleRegister right_reg = i.InputDoubleRegister(1); \
DoubleRegister result_reg = i.OutputDoubleRegister(); \
Label check_nan_left, check_zero, return_left, return_right, done; \
__ fcmpu(left_reg, right_reg); \
__ bunordered(&check_nan_left); \
__ beq(&check_zero); \
__ ble(&return_left); \
__ b(&return_right); \
\
__ bind(&check_zero); \
__ fcmpu(left_reg, kDoubleRegZero); \
/* left == right != 0. */ \
__ bne(&return_left); \
/* At this point, both left and right are either 0 or -0. */ \
/* Min: The algorithm is: -((-L) + (-R)), which in case of L and R */ \
/* being different registers is most efficiently expressed */ \
/* as -((-L) - R). */ \
__ fneg(kScratchDoubleReg, left_reg); \
if (kScratchDoubleReg == right_reg) { \
__ fadd(result_reg, kScratchDoubleReg, right_reg); \
} else { \
__ fsub(result_reg, kScratchDoubleReg, right_reg); \
} \
__ fneg(result_reg, result_reg); \
__ b(&done); \
\
__ bind(&check_nan_left); \
__ fcmpu(left_reg, left_reg); \
/* left == NaN. */ \
__ bunordered(&return_left); \
\
__ bind(&return_right); \
if (right_reg != result_reg) { \
__ fmr(result_reg, right_reg); \
} \
__ b(&done); \
\
__ bind(&return_left); \
if (left_reg != result_reg) { \
__ fmr(result_reg, left_reg); \
} \
__ bind(&done); \
} while (0)
#define ASSEMBLE_LOAD_FLOAT(asm_instr, asm_instrx) \
do { \
DoubleRegister result = i.OutputDoubleRegister(); \
AddressingMode mode = kMode_None; \
MemOperand operand = i.MemoryOperand(&mode); \
bool is_atomic = i.InputInt32(2); \
if (mode == kMode_MRI) { \
__ asm_instr(result, operand); \
} else { \
__ asm_instrx(result, operand); \
} \
if (is_atomic) __ lwsync(); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_LOAD_INTEGER(asm_instr, asm_instrx) \
do { \
Register result = i.OutputRegister(); \
AddressingMode mode = kMode_None; \
MemOperand operand = i.MemoryOperand(&mode); \
bool is_atomic = i.InputInt32(2); \
if (mode == kMode_MRI) { \
__ asm_instr(result, operand); \
} else { \
__ asm_instrx(result, operand); \
} \
if (is_atomic) __ lwsync(); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_STORE_FLOAT(asm_instr, asm_instrx) \
do { \
size_t index = 0; \
AddressingMode mode = kMode_None; \
MemOperand operand = i.MemoryOperand(&mode, &index); \
DoubleRegister value = i.InputDoubleRegister(index); \
bool is_atomic = i.InputInt32(3); \
if (is_atomic) __ lwsync(); \
/* removed frsp as instruction-selector checked */ \
/* value to be kFloat32 */ \
if (mode == kMode_MRI) { \
__ asm_instr(value, operand); \
} else { \
__ asm_instrx(value, operand); \
} \
if (is_atomic) __ sync(); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#define ASSEMBLE_STORE_INTEGER(asm_instr, asm_instrx) \
do { \
size_t index = 0; \
AddressingMode mode = kMode_None; \
MemOperand operand = i.MemoryOperand(&mode, &index); \
Register value = i.InputRegister(index); \
bool is_atomic = i.InputInt32(3); \
if (is_atomic) __ lwsync(); \
if (mode == kMode_MRI) { \
__ asm_instr(value, operand); \
} else { \
__ asm_instrx(value, operand); \
} \
if (is_atomic) __ sync(); \
DCHECK_EQ(LeaveRC, i.OutputRCBit()); \
} while (0)
#if V8_TARGET_ARCH_PPC64
// TODO(mbrandy): fix paths that produce garbage in offset's upper 32-bits.
#define CleanUInt32(x) __ ClearLeftImm(x, x, Operand(32))
#else
#define CleanUInt32(x)
#endif
#define ASSEMBLE_ATOMIC_EXCHANGE_INTEGER(load_instr, store_instr) \
do { \
Label exchange; \
__ lwsync(); \
__ bind(&exchange); \
__ load_instr(i.OutputRegister(0), \
MemOperand(i.InputRegister(0), i.InputRegister(1))); \
__ store_instr(i.InputRegister(2), \
MemOperand(i.InputRegister(0), i.InputRegister(1))); \
__ bne(&exchange, cr0); \
__ sync(); \
} while (0)
#define ASSEMBLE_ATOMIC_BINOP(bin_inst, load_inst, store_inst) \
do { \
MemOperand operand = MemOperand(i.InputRegister(0), i.InputRegister(1)); \
Label binop; \
__ lwsync(); \
__ bind(&binop); \
__ load_inst(i.OutputRegister(), operand); \
__ bin_inst(kScratchReg, i.OutputRegister(), i.InputRegister(2)); \
__ store_inst(kScratchReg, operand); \
__ bne(&binop, cr0); \
__ sync(); \
} while (false)
#define ASSEMBLE_ATOMIC_BINOP_SIGN_EXT(bin_inst, load_inst, store_inst, \
ext_instr) \
do { \
MemOperand operand = MemOperand(i.InputRegister(0), i.InputRegister(1)); \
Label binop; \
__ lwsync(); \
__ bind(&binop); \
__ load_inst(i.OutputRegister(), operand); \
__ ext_instr(i.OutputRegister(), i.OutputRegister()); \
__ bin_inst(kScratchReg, i.OutputRegister(), i.InputRegister(2)); \
__ store_inst(kScratchReg, operand); \
__ bne(&binop, cr0); \
__ sync(); \
} while (false)
#define ASSEMBLE_ATOMIC_COMPARE_EXCHANGE(cmp_inst, load_inst, store_inst, \
input_ext) \
do { \
MemOperand operand = MemOperand(i.InputRegister(0), i.InputRegister(1)); \
Label loop; \
Label exit; \
__ input_ext(r0, i.InputRegister(2)); \
__ lwsync(); \
__ bind(&loop); \
__ load_inst(i.OutputRegister(), operand); \
__ cmp_inst(i.OutputRegister(), r0, cr0); \
__ bne(&exit, cr0); \
__ store_inst(i.InputRegister(3), operand); \
__ bne(&loop, cr0); \
__ bind(&exit); \
__ sync(); \
} while (false)
#define ASSEMBLE_ATOMIC_COMPARE_EXCHANGE_SIGN_EXT(cmp_inst, load_inst, \
store_inst, ext_instr) \
do { \
MemOperand operand = MemOperand(i.InputRegister(0), i.InputRegister(1)); \
Label loop; \
Label exit; \
__ ext_instr(r0, i.InputRegister(2)); \
__ lwsync(); \
__ bind(&loop); \
__ load_inst(i.OutputRegister(), operand); \
__ ext_instr(i.OutputRegister(), i.OutputRegister()); \
__ cmp_inst(i.OutputRegister(), r0, cr0); \
__ bne(&exit, cr0); \
__ store_inst(i.InputRegister(3), operand); \
__ bne(&loop, cr0); \
__ bind(&exit); \
__ sync(); \
} while (false)
void CodeGenerator::AssembleDeconstructFrame() {
__ LeaveFrame(StackFrame::MANUAL);
unwinding_info_writer_.MarkFrameDeconstructed(__ pc_offset());
}
void CodeGenerator::AssemblePrepareTailCall() {
if (frame_access_state()->has_frame()) {
__ RestoreFrameStateForTailCall();
}
frame_access_state()->SetFrameAccessToSP();
}
void CodeGenerator::AssemblePopArgumentsAdaptorFrame(Register args_reg,
Register scratch1,
Register scratch2,
Register scratch3) {
DCHECK(!AreAliased(args_reg, scratch1, scratch2, scratch3));
Label done;
// Check if current frame is an arguments adaptor frame.
__ LoadP(scratch1, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ cmpi(scratch1,
Operand(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
__ bne(&done);
// Load arguments count from current arguments adaptor frame (note, it
// does not include receiver).
Register caller_args_count_reg = scratch1;
__ LoadP(caller_args_count_reg,
MemOperand(fp, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiUntag(caller_args_count_reg);
__ PrepareForTailCall(args_reg, caller_args_count_reg, scratch2, scratch3);
__ bind(&done);
}
namespace {
void FlushPendingPushRegisters(TurboAssembler* tasm,
FrameAccessState* frame_access_state,
ZoneVector<Register>* pending_pushes) {
switch (pending_pushes->size()) {
case 0:
break;
case 1:
tasm->Push((*pending_pushes)[0]);
break;
case 2:
tasm->Push((*pending_pushes)[0], (*pending_pushes)[1]);
break;
case 3:
tasm->Push((*pending_pushes)[0], (*pending_pushes)[1],
(*pending_pushes)[2]);
break;
default:
UNREACHABLE();
}
frame_access_state->IncreaseSPDelta(pending_pushes->size());
pending_pushes->clear();
}
void AdjustStackPointerForTailCall(
TurboAssembler* tasm, FrameAccessState* state, int new_slot_above_sp,
ZoneVector<Register>* pending_pushes = nullptr,
bool allow_shrinkage = true) {
int current_sp_offset = state->GetSPToFPSlotCount() +
StandardFrameConstants::kFixedSlotCountAboveFp;
int stack_slot_delta = new_slot_above_sp - current_sp_offset;
if (stack_slot_delta > 0) {
if (pending_pushes != nullptr) {
FlushPendingPushRegisters(tasm, state, pending_pushes);
}
tasm->Add(sp, sp, -stack_slot_delta * kSystemPointerSize, r0);
state->IncreaseSPDelta(stack_slot_delta);
} else if (allow_shrinkage && stack_slot_delta < 0) {
if (pending_pushes != nullptr) {
FlushPendingPushRegisters(tasm, state, pending_pushes);
}
tasm->Add(sp, sp, -stack_slot_delta * kSystemPointerSize, r0);
state->IncreaseSPDelta(stack_slot_delta);
}
}
} // namespace
void CodeGenerator::AssembleTailCallBeforeGap(Instruction* instr,
int first_unused_stack_slot) {
ZoneVector<MoveOperands*> pushes(zone());
GetPushCompatibleMoves(instr, kRegisterPush, &pushes);
if (!pushes.empty() &&
(LocationOperand::cast(pushes.back()->destination()).index() + 1 ==
first_unused_stack_slot)) {
PPCOperandConverter g(this, instr);
ZoneVector<Register> pending_pushes(zone());
for (auto move : pushes) {
LocationOperand destination_location(
LocationOperand::cast(move->destination()));
InstructionOperand source(move->source());
AdjustStackPointerForTailCall(
tasm(), frame_access_state(),
destination_location.index() - pending_pushes.size(),
&pending_pushes);
// Pushes of non-register data types are not supported.
DCHECK(source.IsRegister());
LocationOperand source_location(LocationOperand::cast(source));
pending_pushes.push_back(source_location.GetRegister());
// TODO(arm): We can push more than 3 registers at once. Add support in
// the macro-assembler for pushing a list of registers.
if (pending_pushes.size() == 3) {
FlushPendingPushRegisters(tasm(), frame_access_state(),
&pending_pushes);
}
move->Eliminate();
}
FlushPendingPushRegisters(tasm(), frame_access_state(), &pending_pushes);
}
AdjustStackPointerForTailCall(tasm(), frame_access_state(),
first_unused_stack_slot, nullptr, false);
}
void CodeGenerator::AssembleTailCallAfterGap(Instruction* instr,
int first_unused_stack_slot) {
AdjustStackPointerForTailCall(tasm(), frame_access_state(),
first_unused_stack_slot);
}
// Check that {kJavaScriptCallCodeStartRegister} is correct.
void CodeGenerator::AssembleCodeStartRegisterCheck() {
Register scratch = kScratchReg;
__ ComputeCodeStartAddress(scratch);
__ cmp(scratch, kJavaScriptCallCodeStartRegister);
__ Assert(eq, AbortReason::kWrongFunctionCodeStart);
}
// Check if the code object is marked for deoptimization. If it is, then it
// jumps to the CompileLazyDeoptimizedCode builtin. In order to do this we need
// to:
// 1. read from memory the word that contains that bit, which can be found in
// the flags in the referenced {CodeDataContainer} object;
// 2. test kMarkedForDeoptimizationBit in those flags; and
// 3. if it is not zero then it jumps to the builtin.
void CodeGenerator::BailoutIfDeoptimized() {
if (FLAG_debug_code) {
// Check that {kJavaScriptCallCodeStartRegister} is correct.
__ ComputeCodeStartAddress(ip);
__ cmp(ip, kJavaScriptCallCodeStartRegister);
__ Assert(eq, AbortReason::kWrongFunctionCodeStart);
}
int offset = Code::kCodeDataContainerOffset - Code::kHeaderSize;
__ LoadTaggedPointerField(
r11, MemOperand(kJavaScriptCallCodeStartRegister, offset));
__ LoadWordArith(
r11, FieldMemOperand(r11, CodeDataContainer::kKindSpecificFlagsOffset));
__ TestBit(r11, Code::kMarkedForDeoptimizationBit);
__ Jump(BUILTIN_CODE(isolate(), CompileLazyDeoptimizedCode),
RelocInfo::CODE_TARGET, ne, cr0);
}
void CodeGenerator::GenerateSpeculationPoisonFromCodeStartRegister() {
Register scratch = kScratchReg;
__ ComputeCodeStartAddress(scratch);
// Calculate a mask which has all bits set in the normal case, but has all
// bits cleared if we are speculatively executing the wrong PC.
__ cmp(kJavaScriptCallCodeStartRegister, scratch);
__ li(scratch, Operand::Zero());
__ notx(kSpeculationPoisonRegister, scratch);
__ isel(eq, kSpeculationPoisonRegister, kSpeculationPoisonRegister, scratch);
}
void CodeGenerator::AssembleRegisterArgumentPoisoning() {
__ and_(kJSFunctionRegister, kJSFunctionRegister, kSpeculationPoisonRegister);
__ and_(kContextRegister, kContextRegister, kSpeculationPoisonRegister);
__ and_(sp, sp, kSpeculationPoisonRegister);
}
// Assembles an instruction after register allocation, producing machine code.
CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
Instruction* instr) {
PPCOperandConverter i(this, instr);
ArchOpcode opcode = ArchOpcodeField::decode(instr->opcode());
switch (opcode) {
case kArchCallCodeObject: {
v8::internal::Assembler::BlockTrampolinePoolScope block_trampoline_pool(
tasm());
if (HasRegisterInput(instr, 0)) {
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
__ CallCodeObject(reg);
} else {
__ Call(i.InputCode(0), RelocInfo::CODE_TARGET);
}
RecordCallPosition(instr);
DCHECK_EQ(LeaveRC, i.OutputRCBit());
frame_access_state()->ClearSPDelta();
break;
}
case kArchCallBuiltinPointer: {
DCHECK(!instr->InputAt(0)->IsImmediate());
Register builtin_index = i.InputRegister(0);
__ CallBuiltinByIndex(builtin_index);
RecordCallPosition(instr);
frame_access_state()->ClearSPDelta();
break;
}
case kArchCallWasmFunction: {
// We must not share code targets for calls to builtins for wasm code, as
// they might need to be patched individually.
if (instr->InputAt(0)->IsImmediate()) {
Constant constant = i.ToConstant(instr->InputAt(0));
#ifdef V8_TARGET_ARCH_PPC64
Address wasm_code = static_cast<Address>(constant.ToInt64());
#else
Address wasm_code = static_cast<Address>(constant.ToInt32());
#endif
__ Call(wasm_code, constant.rmode());
} else {
__ Call(i.InputRegister(0));
}
RecordCallPosition(instr);
DCHECK_EQ(LeaveRC, i.OutputRCBit());
frame_access_state()->ClearSPDelta();
break;
}
case kArchTailCallCodeObjectFromJSFunction:
case kArchTailCallCodeObject: {
if (opcode == kArchTailCallCodeObjectFromJSFunction) {
AssemblePopArgumentsAdaptorFrame(kJavaScriptCallArgCountRegister,
i.TempRegister(0), i.TempRegister(1),
i.TempRegister(2));
}
if (HasRegisterInput(instr, 0)) {
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
__ JumpCodeObject(reg);
} else {
// We cannot use the constant pool to load the target since
// we've already restored the caller's frame.
ConstantPoolUnavailableScope constant_pool_unavailable(tasm());
__ Jump(i.InputCode(0), RelocInfo::CODE_TARGET);
}
DCHECK_EQ(LeaveRC, i.OutputRCBit());
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchTailCallWasm: {
// We must not share code targets for calls to builtins for wasm code, as
// they might need to be patched individually.
if (instr->InputAt(0)->IsImmediate()) {
Constant constant = i.ToConstant(instr->InputAt(0));
#ifdef V8_TARGET_ARCH_PPC64
Address wasm_code = static_cast<Address>(constant.ToInt64());
#else
Address wasm_code = static_cast<Address>(constant.ToInt32());
#endif
__ Jump(wasm_code, constant.rmode());
} else {
__ Jump(i.InputRegister(0));
}
DCHECK_EQ(LeaveRC, i.OutputRCBit());
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchTailCallAddress: {
CHECK(!instr->InputAt(0)->IsImmediate());
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
__ Jump(reg);
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchCallJSFunction: {
v8::internal::Assembler::BlockTrampolinePoolScope block_trampoline_pool(
tasm());
Register func = i.InputRegister(0);
if (FLAG_debug_code) {
// Check the function's context matches the context argument.
__ LoadTaggedPointerField(
kScratchReg, FieldMemOperand(func, JSFunction::kContextOffset));
__ cmp(cp, kScratchReg);
__ Assert(eq, AbortReason::kWrongFunctionContext);
}
static_assert(kJavaScriptCallCodeStartRegister == r5, "ABI mismatch");
__ LoadTaggedPointerField(r5,
FieldMemOperand(func, JSFunction::kCodeOffset));
__ CallCodeObject(r5);
RecordCallPosition(instr);
DCHECK_EQ(LeaveRC, i.OutputRCBit());
frame_access_state()->ClearSPDelta();
break;
}
case kArchPrepareCallCFunction: {
int const num_parameters = MiscField::decode(instr->opcode());
__ PrepareCallCFunction(num_parameters, kScratchReg);
// Frame alignment requires using FP-relative frame addressing.
frame_access_state()->SetFrameAccessToFP();
break;
}
case kArchSaveCallerRegisters: {
fp_mode_ =
static_cast<SaveFPRegsMode>(MiscField::decode(instr->opcode()));