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cobalt / cobalt / 25902c6cb1ab9cfd8ae2ee6b0fb52953f73deda5 / . / v8 / src / compiler / backend / code-generator.cc
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// Copyright 2013 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/compiler/backend/code-generator.h"
#include "src/base/iterator.h"
#include "src/codegen/assembler-inl.h"
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/codegen/string-constants.h"
#include "src/compiler/backend/code-generator-impl.h"
#include "src/compiler/globals.h"
#include "src/compiler/linkage.h"
#include "src/compiler/pipeline.h"
#include "src/compiler/wasm-compiler.h"
#include "src/diagnostics/eh-frame.h"
#include "src/execution/frames.h"
#include "src/logging/counters.h"
#include "src/logging/log.h"
#include "src/objects/smi.h"
#include "src/utils/address-map.h"
namespace v8 {
namespace internal {
namespace compiler {
class CodeGenerator::JumpTable final : public ZoneObject {
public:
JumpTable(JumpTable* next, Label** targets, size_t target_count)
: next_(next), targets_(targets), target_count_(target_count) {}
Label* label() { return &label_; }
JumpTable* next() const { return next_; }
Label** targets() const { return targets_; }
size_t target_count() const { return target_count_; }
private:
Label label_;
JumpTable* const next_;
Label** const targets_;
size_t const target_count_;
};
CodeGenerator::CodeGenerator(
Zone* codegen_zone, Frame* frame, Linkage* linkage,
InstructionSequence* instructions, OptimizedCompilationInfo* info,
Isolate* isolate, base::Optional<OsrHelper> osr_helper,
int start_source_position, JumpOptimizationInfo* jump_opt,
PoisoningMitigationLevel poisoning_level, const AssemblerOptions& options,
int32_t builtin_index, size_t max_unoptimized_frame_height,
size_t max_pushed_argument_count, std::unique_ptr<AssemblerBuffer> buffer,
const char* debug_name)
: zone_(codegen_zone),
isolate_(isolate),
frame_access_state_(nullptr),
linkage_(linkage),
instructions_(instructions),
unwinding_info_writer_(codegen_zone),
info_(info),
labels_(
codegen_zone->NewArray<Label>(instructions->InstructionBlockCount())),
current_block_(RpoNumber::Invalid()),
start_source_position_(start_source_position),
current_source_position_(SourcePosition::Unknown()),
tasm_(isolate, options, CodeObjectRequired::kNo, std::move(buffer)),
resolver_(this),
safepoints_(codegen_zone),
handlers_(codegen_zone),
deoptimization_exits_(codegen_zone),
deoptimization_literals_(codegen_zone),
translations_(codegen_zone),
max_unoptimized_frame_height_(max_unoptimized_frame_height),
max_pushed_argument_count_(max_pushed_argument_count),
caller_registers_saved_(false),
jump_tables_(nullptr),
ools_(nullptr),
osr_helper_(std::move(osr_helper)),
osr_pc_offset_(-1),
optimized_out_literal_id_(-1),
source_position_table_builder_(
codegen_zone, SourcePositionTableBuilder::RECORD_SOURCE_POSITIONS),
protected_instructions_(codegen_zone),
result_(kSuccess),
poisoning_level_(poisoning_level),
block_starts_(codegen_zone),
instr_starts_(codegen_zone),
debug_name_(debug_name) {
for (int i = 0; i < instructions->InstructionBlockCount(); ++i) {
new (&labels_[i]) Label;
}
CreateFrameAccessState(frame);
CHECK_EQ(info->is_osr(), osr_helper_.has_value());
tasm_.set_jump_optimization_info(jump_opt);
CodeKind code_kind = info->code_kind();
if (code_kind == CodeKind::WASM_FUNCTION ||
code_kind == CodeKind::WASM_TO_CAPI_FUNCTION ||
code_kind == CodeKind::WASM_TO_JS_FUNCTION ||
code_kind == CodeKind::JS_TO_WASM_FUNCTION) {
tasm_.set_abort_hard(true);
}
tasm_.set_builtin_index(builtin_index);
}
bool CodeGenerator::wasm_runtime_exception_support() const {
DCHECK_NOT_NULL(info_);
return info_->wasm_runtime_exception_support();
}
void CodeGenerator::AddProtectedInstructionLanding(uint32_t instr_offset,
uint32_t landing_offset) {
protected_instructions_.push_back({instr_offset, landing_offset});
}
void CodeGenerator::CreateFrameAccessState(Frame* frame) {
FinishFrame(frame);
frame_access_state_ = zone()->New<FrameAccessState>(frame);
}
bool CodeGenerator::ShouldApplyOffsetToStackCheck(Instruction* instr,
uint32_t* offset) {
DCHECK_EQ(instr->arch_opcode(), kArchStackPointerGreaterThan);
StackCheckKind kind =
static_cast<StackCheckKind>(MiscField::decode(instr->opcode()));
if (kind != StackCheckKind::kJSFunctionEntry) return false;
uint32_t stack_check_offset = *offset = GetStackCheckOffset();
return stack_check_offset > kStackLimitSlackForDeoptimizationInBytes;
}
uint32_t CodeGenerator::GetStackCheckOffset() {
if (!frame_access_state()->has_frame()) {
DCHECK_EQ(max_unoptimized_frame_height_, 0);
DCHECK_EQ(max_pushed_argument_count_, 0);
return 0;
}
int32_t optimized_frame_height =
frame()->GetTotalFrameSlotCount() * kSystemPointerSize;
DCHECK(is_int32(max_unoptimized_frame_height_));
int32_t signed_max_unoptimized_frame_height =
static_cast<int32_t>(max_unoptimized_frame_height_);
// The offset is either the delta between the optimized frames and the
// interpreted frame, or the maximal number of bytes pushed to the stack
// while preparing for function calls, whichever is bigger.
uint32_t frame_height_delta = static_cast<uint32_t>(std::max(
signed_max_unoptimized_frame_height - optimized_frame_height, 0));
uint32_t max_pushed_argument_bytes =
static_cast<uint32_t>(max_pushed_argument_count_ * kSystemPointerSize);
return std::max(frame_height_delta, max_pushed_argument_bytes);
}
CodeGenerator::CodeGenResult CodeGenerator::AssembleDeoptimizerCall(
DeoptimizationExit* exit) {
int deoptimization_id = exit->deoptimization_id();
if (deoptimization_id > Deoptimizer::kMaxNumberOfEntries) {
return kTooManyDeoptimizationBailouts;
}
DeoptimizeKind deopt_kind = exit->kind();
DeoptimizeReason deoptimization_reason = exit->reason();
Builtins::Name deopt_entry =
Deoptimizer::GetDeoptimizationEntry(tasm()->isolate(), deopt_kind);
Label* jump_deoptimization_entry_label =
&jump_deoptimization_entry_labels_[static_cast<int>(deopt_kind)];
if (info()->source_positions()) {
tasm()->RecordDeoptReason(deoptimization_reason, exit->pos(),
deoptimization_id);
}
if (deopt_kind == DeoptimizeKind::kLazy) {
tasm()->BindExceptionHandler(exit->label());
} else {
++non_lazy_deopt_count_;
tasm()->bind(exit->label());
}
tasm()->CallForDeoptimization(deopt_entry, deoptimization_id, exit->label(),
deopt_kind, jump_deoptimization_entry_label);
exit->set_emitted();
return kSuccess;
}
void CodeGenerator::MaybeEmitOutOfLineConstantPool() {
tasm()->MaybeEmitOutOfLineConstantPool();
}
void CodeGenerator::AssembleCode() {
OptimizedCompilationInfo* info = this->info();
// Open a frame scope to indicate that there is a frame on the stack. The
// MANUAL indicates that the scope shouldn't actually generate code to set up
// the frame (that is done in AssemblePrologue).
FrameScope frame_scope(tasm(), StackFrame::MANUAL);
if (info->source_positions()) {
AssembleSourcePosition(start_source_position());
}
offsets_info_.code_start_register_check = tasm()->pc_offset();
tasm()->CodeEntry();
// Check that {kJavaScriptCallCodeStartRegister} has been set correctly.
if (FLAG_debug_code && info->called_with_code_start_register()) {
tasm()->RecordComment("-- Prologue: check code start register --");
AssembleCodeStartRegisterCheck();
}
offsets_info_.deopt_check = tasm()->pc_offset();
// We want to bailout only from JS functions, which are the only ones
// that are optimized.
if (info->IsOptimizing()) {
DCHECK(linkage()->GetIncomingDescriptor()->IsJSFunctionCall());
tasm()->RecordComment("-- Prologue: check for deoptimization --");
BailoutIfDeoptimized();
}
offsets_info_.init_poison = tasm()->pc_offset();
InitializeSpeculationPoison();
// Define deoptimization literals for all inlined functions.
DCHECK_EQ(0u, deoptimization_literals_.size());
for (OptimizedCompilationInfo::InlinedFunctionHolder& inlined :
info->inlined_functions()) {
if (!inlined.shared_info.equals(info->shared_info())) {
int index = DefineDeoptimizationLiteral(
DeoptimizationLiteral(inlined.shared_info));
inlined.RegisterInlinedFunctionId(index);
}
}
inlined_function_count_ = deoptimization_literals_.size();
// Define deoptimization literals for all BytecodeArrays to which we might
// deopt to ensure they are strongly held by the optimized code.
if (info->has_bytecode_array()) {
DefineDeoptimizationLiteral(DeoptimizationLiteral(info->bytecode_array()));
}
for (OptimizedCompilationInfo::InlinedFunctionHolder& inlined :
info->inlined_functions()) {
DefineDeoptimizationLiteral(DeoptimizationLiteral(inlined.bytecode_array));
}
unwinding_info_writer_.SetNumberOfInstructionBlocks(
instructions()->InstructionBlockCount());
if (info->trace_turbo_json()) {
block_starts_.assign(instructions()->instruction_blocks().size(), -1);
instr_starts_.assign(instructions()->instructions().size(), {});
}
// Assemble instructions in assembly order.
offsets_info_.blocks_start = tasm()->pc_offset();
for (const InstructionBlock* block : instructions()->ao_blocks()) {
// Align loop headers on vendor recommended boundaries.
if (block->ShouldAlign() && !tasm()->jump_optimization_info()) {
tasm()->CodeTargetAlign();
}
if (info->trace_turbo_json()) {
block_starts_[block->rpo_number().ToInt()] = tasm()->pc_offset();
}
// Bind a label for a block.
current_block_ = block->rpo_number();
unwinding_info_writer_.BeginInstructionBlock(tasm()->pc_offset(), block);
if (FLAG_code_comments) {
std::ostringstream buffer;
buffer << "-- B" << block->rpo_number().ToInt() << " start";
if (block->IsDeferred()) buffer << " (deferred)";
if (!block->needs_frame()) buffer << " (no frame)";
if (block->must_construct_frame()) buffer << " (construct frame)";
if (block->must_deconstruct_frame()) buffer << " (deconstruct frame)";
if (block->IsLoopHeader()) {
buffer << " (loop up to " << block->loop_end().ToInt() << ")";
}
if (block->loop_header().IsValid()) {
buffer << " (in loop " << block->loop_header().ToInt() << ")";
}
buffer << " --";
tasm()->RecordComment(buffer.str().c_str());
}
frame_access_state()->MarkHasFrame(block->needs_frame());
tasm()->bind(GetLabel(current_block_));
TryInsertBranchPoisoning(block);
if (block->must_construct_frame()) {
AssembleConstructFrame();
// We need to setup the root register after we assemble the prologue, to
// avoid clobbering callee saved registers in case of C linkage and
// using the roots.
// TODO(mtrofin): investigate how we can avoid doing this repeatedly.
if (linkage()->GetIncomingDescriptor()->InitializeRootRegister()) {
tasm()->InitializeRootRegister();
}
}
if (FLAG_enable_embedded_constant_pool && !block->needs_frame()) {
ConstantPoolUnavailableScope constant_pool_unavailable(tasm());
result_ = AssembleBlock(block);
} else {
result_ = AssembleBlock(block);
}
if (result_ != kSuccess) return;
unwinding_info_writer_.EndInstructionBlock(block);
}
// Assemble all out-of-line code.
offsets_info_.out_of_line_code = tasm()->pc_offset();
if (ools_) {
tasm()->RecordComment("-- Out of line code --");
for (OutOfLineCode* ool = ools_; ool; ool = ool->next()) {
tasm()->bind(ool->entry());
ool->Generate();
if (ool->exit()->is_bound()) tasm()->jmp(ool->exit());
}
}
// This nop operation is needed to ensure that the trampoline is not
// confused with the pc of the call before deoptimization.
// The test regress/regress-259 is an example of where we need it.
tasm()->nop();
// For some targets, we must make sure that constant and veneer pools are
// emitted before emitting the deoptimization exits.
PrepareForDeoptimizationExits(&deoptimization_exits_);
if (Deoptimizer::kSupportsFixedDeoptExitSizes) {
deopt_exit_start_offset_ = tasm()->pc_offset();
}
// Assemble deoptimization exits.
offsets_info_.deoptimization_exits = tasm()->pc_offset();
int last_updated = 0;
// We sort the deoptimization exits here so that the lazy ones will
// be visited last. We need this as on architectures where
// Deoptimizer::kSupportsFixedDeoptExitSizes is true, lazy deopts
// might need additional instructions.
auto cmp = [](const DeoptimizationExit* a, const DeoptimizationExit* b) {
static_assert(DeoptimizeKind::kLazy == kLastDeoptimizeKind,
"lazy deopts are expected to be emitted last");
if (a->kind() != b->kind()) {
return a->kind() < b->kind();
}
return a->pc_offset() < b->pc_offset();
};
if (Deoptimizer::kSupportsFixedDeoptExitSizes) {
std::sort(deoptimization_exits_.begin(), deoptimization_exits_.end(), cmp);
}
for (DeoptimizationExit* exit : deoptimization_exits_) {
if (exit->emitted()) continue;
if (Deoptimizer::kSupportsFixedDeoptExitSizes) {
exit->set_deoptimization_id(next_deoptimization_id_++);
}
result_ = AssembleDeoptimizerCall(exit);
if (result_ != kSuccess) return;
// UpdateDeoptimizationInfo expects lazy deopts to be visited in pc_offset
// order, which is always the case since they are added to
// deoptimization_exits_ in that order, and the optional sort operation
// above preserves that order.
if (exit->kind() == DeoptimizeKind::kLazy) {
int trampoline_pc = exit->label()->pos();
last_updated = safepoints()->UpdateDeoptimizationInfo(
exit->pc_offset(), trampoline_pc, last_updated,
exit->deoptimization_id());
}
}
offsets_info_.pools = tasm()->pc_offset();
// TODO(jgruber): Move all inlined metadata generation into a new,
// architecture-independent version of FinishCode. Currently, this includes
// the safepoint table, handler table, constant pool, and code comments, in
// that order.
FinishCode();
offsets_info_.jump_tables = tasm()->pc_offset();
// Emit the jump tables.
if (jump_tables_) {
tasm()->Align(kSystemPointerSize);
for (JumpTable* table = jump_tables_; table; table = table->next()) {
tasm()->bind(table->label());
AssembleJumpTable(table->targets(), table->target_count());
}
}
// The PerfJitLogger logs code up until here, excluding the safepoint
// table. Resolve the unwinding info now so it is aware of the same code
// size as reported by perf.
unwinding_info_writer_.Finish(tasm()->pc_offset());
// Final alignment before starting on the metadata section.
tasm()->Align(Code::kMetadataAlignment);
safepoints()->Emit(tasm(), frame()->GetTotalFrameSlotCount());
// Emit the exception handler table.
if (!handlers_.empty()) {
handler_table_offset_ = HandlerTable::EmitReturnTableStart(tasm());
for (size_t i = 0; i < handlers_.size(); ++i) {
HandlerTable::EmitReturnEntry(tasm(), handlers_[i].pc_offset,
handlers_[i].handler->pos());
}
}
tasm()->MaybeEmitOutOfLineConstantPool();
tasm()->FinalizeJumpOptimizationInfo();
result_ = kSuccess;
}
void CodeGenerator::TryInsertBranchPoisoning(const InstructionBlock* block) {
// See if our predecessor was a basic block terminated by a branch_and_poison
// instruction. If yes, then perform the masking based on the flags.
if (block->PredecessorCount() != 1) return;
RpoNumber pred_rpo = (block->predecessors())[0];
const InstructionBlock* pred = instructions()->InstructionBlockAt(pred_rpo);
if (pred->code_start() == pred->code_end()) return;
Instruction* instr = instructions()->InstructionAt(pred->code_end() - 1);
FlagsMode mode = FlagsModeField::decode(instr->opcode());
switch (mode) {
case kFlags_branch_and_poison: {
BranchInfo branch;
RpoNumber target = ComputeBranchInfo(&branch, instr);
if (!target.IsValid()) {
// Non-trivial branch, add the masking code.
FlagsCondition condition = branch.condition;
if (branch.false_label == GetLabel(block->rpo_number())) {
condition = NegateFlagsCondition(condition);
}
AssembleBranchPoisoning(condition, instr);
}
break;
}
case kFlags_deoptimize_and_poison: {
UNREACHABLE();
}
default:
break;
}
}
void CodeGenerator::AssembleArchBinarySearchSwitchRange(
Register input, RpoNumber def_block, std::pair<int32_t, Label*>* begin,
std::pair<int32_t, Label*>* end) {
if (end - begin < kBinarySearchSwitchMinimalCases) {
while (begin != end) {
tasm()->JumpIfEqual(input, begin->first, begin->second);
++begin;
}
AssembleArchJump(def_block);
return;
}
auto middle = begin + (end - begin) / 2;
Label less_label;
tasm()->JumpIfLessThan(input, middle->first, &less_label);
AssembleArchBinarySearchSwitchRange(input, def_block, middle, end);
tasm()->bind(&less_label);
AssembleArchBinarySearchSwitchRange(input, def_block, begin, middle);
}
OwnedVector<byte> CodeGenerator::GetSourcePositionTable() {
return source_position_table_builder_.ToSourcePositionTableVector();
}
OwnedVector<byte> CodeGenerator::GetProtectedInstructionsData() {
return OwnedVector<byte>::Of(
Vector<byte>::cast(VectorOf(protected_instructions_)));
}
MaybeHandle<Code> CodeGenerator::FinalizeCode() {
if (result_ != kSuccess) {
tasm()->AbortedCodeGeneration();
return MaybeHandle<Code>();
}
// Allocate the source position table.
Handle<ByteArray> source_positions =
source_position_table_builder_.ToSourcePositionTable(isolate());
// Allocate deoptimization data.
Handle<DeoptimizationData> deopt_data = GenerateDeoptimizationData();
// Allocate and install the code.
CodeDesc desc;
tasm()->GetCode(isolate(), &desc, safepoints(), handler_table_offset_);
#if defined(V8_OS_WIN64)
if (Builtins::IsBuiltinId(info_->builtin_index())) {
isolate_->SetBuiltinUnwindData(info_->builtin_index(),
tasm()->GetUnwindInfo());
}
#endif // V8_OS_WIN64
if (unwinding_info_writer_.eh_frame_writer()) {
unwinding_info_writer_.eh_frame_writer()->GetEhFrame(&desc);
}
MaybeHandle<Code> maybe_code =
Factory::CodeBuilder(isolate(), desc, info()->code_kind())
.set_builtin_index(info()->builtin_index())
.set_inlined_bytecode_size(info()->inlined_bytecode_size())
.set_source_position_table(source_positions)
.set_deoptimization_data(deopt_data)
.set_is_turbofanned()
.set_stack_slots(frame()->GetTotalFrameSlotCount())
.set_profiler_data(info()->profiler_data())
.TryBuild();
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
tasm()->AbortedCodeGeneration();
return MaybeHandle<Code>();
}
// TODO(jgruber,v8:8888): Turn this into a DCHECK once confidence is
// high that the implementation is complete.
CHECK_IMPLIES(info()->IsNativeContextIndependent(),
code->IsNativeContextIndependent(isolate()));
// Counts both compiled code and metadata.
isolate()->counters()->total_compiled_code_size()->Increment(
code->raw_body_size());
LOG_CODE_EVENT(isolate(),
CodeLinePosInfoRecordEvent(code->raw_instruction_start(),
*source_positions));
return code;
}
bool CodeGenerator::IsNextInAssemblyOrder(RpoNumber block) const {
return instructions()
->InstructionBlockAt(current_block_)
->ao_number()
.IsNext(instructions()->InstructionBlockAt(block)->ao_number());
}
void CodeGenerator::RecordSafepoint(ReferenceMap* references,
Safepoint::DeoptMode deopt_mode) {
Safepoint safepoint = safepoints()->DefineSafepoint(tasm(), deopt_mode);
int stackSlotToSpillSlotDelta =
frame()->GetTotalFrameSlotCount() - frame()->GetSpillSlotCount();
for (const InstructionOperand& operand : references->reference_operands()) {
if (operand.IsStackSlot()) {
int index = LocationOperand::cast(operand).index();
DCHECK_LE(0, index);
// We might index values in the fixed part of the frame (i.e. the
// closure pointer or the context pointer); these are not spill slots
// and therefore don't work with the SafepointTable currently, but
// we also don't need to worry about them, since the GC has special
// knowledge about those fields anyway.
if (index < stackSlotToSpillSlotDelta) continue;
safepoint.DefinePointerSlot(index);
}
}
}
bool CodeGenerator::IsMaterializableFromRoot(Handle<HeapObject> object,
RootIndex* index_return) {
const CallDescriptor* incoming_descriptor =
linkage()->GetIncomingDescriptor();
if (incoming_descriptor->flags() & CallDescriptor::kCanUseRoots) {
return isolate()->roots_table().IsRootHandle(object, index_return) &&
RootsTable::IsImmortalImmovable(*index_return);
}
return false;
}
CodeGenerator::CodeGenResult CodeGenerator::AssembleBlock(
const InstructionBlock* block) {
if (block->IsHandler()) {
tasm()->ExceptionHandler();
}
for (int i = block->code_start(); i < block->code_end(); ++i) {
CodeGenResult result = AssembleInstruction(i, block);
if (result != kSuccess) return result;
}
return kSuccess;
}
bool CodeGenerator::IsValidPush(InstructionOperand source,
CodeGenerator::PushTypeFlags push_type) {
if (source.IsImmediate() &&
((push_type & CodeGenerator::kImmediatePush) != 0)) {
return true;
}
if (source.IsRegister() &&
((push_type & CodeGenerator::kRegisterPush) != 0)) {
return true;
}
if (source.IsStackSlot() &&
((push_type & CodeGenerator::kStackSlotPush) != 0)) {
return true;
}
return false;
}
void CodeGenerator::GetPushCompatibleMoves(Instruction* instr,
PushTypeFlags push_type,
ZoneVector<MoveOperands*>* pushes) {
static constexpr int first_push_compatible_index =
kReturnAddressStackSlotCount;
pushes->clear();
for (int i = Instruction::FIRST_GAP_POSITION;
i <= Instruction::LAST_GAP_POSITION; ++i) {
Instruction::GapPosition inner_pos =
static_cast<Instruction::GapPosition>(i);
ParallelMove* parallel_move = instr->GetParallelMove(inner_pos);
if (parallel_move != nullptr) {
for (auto move : *parallel_move) {
InstructionOperand source = move->source();
InstructionOperand destination = move->destination();
// If there are any moves from slots that will be overridden by pushes,
// then the full gap resolver must be used since optimization with
// pushes don't participate in the parallel move and might clobber
// values needed for the gap resolve.
if (source.IsAnyStackSlot() && LocationOperand::cast(source).index() >=
first_push_compatible_index) {
pushes->clear();
return;
}
// TODO(danno): Right now, only consider moves from the FIRST gap for
// pushes. Theoretically, we could extract pushes for both gaps (there
// are cases where this happens), but the logic for that would also have
// to check to make sure that non-memory inputs to the pushes from the
// LAST gap don't get clobbered in the FIRST gap.
if (i == Instruction::FIRST_GAP_POSITION) {
if (destination.IsStackSlot() &&
LocationOperand::cast(destination).index() >=
first_push_compatible_index) {
int index = LocationOperand::cast(destination).index();
if (IsValidPush(source, push_type)) {
if (index >= static_cast<int>(pushes->size())) {
pushes->resize(index + 1);
}
(*pushes)[index] = move;
}
}
}
}
}
}
// For now, only support a set of continuous pushes at the end of the list.
size_t push_count_upper_bound = pushes->size();
size_t push_begin = push_count_upper_bound;
for (auto move : base::Reversed(*pushes)) {
if (move == nullptr) break;
push_begin--;
}
size_t push_count = pushes->size() - push_begin;
std::copy(pushes->begin() + push_begin,
pushes->begin() + push_begin + push_count, pushes->begin());
pushes->resize(push_count);
}
CodeGenerator::MoveType::Type CodeGenerator::MoveType::InferMove(
InstructionOperand* source, InstructionOperand* destination) {
if (source->IsConstant()) {
if (destination->IsAnyRegister()) {
return MoveType::kConstantToRegister;
} else {
DCHECK(destination->IsAnyStackSlot());
return MoveType::kConstantToStack;
}
}
DCHECK(LocationOperand::cast(source)->IsCompatible(
LocationOperand::cast(destination)));
if (source->IsAnyRegister()) {
if (destination->IsAnyRegister()) {
return MoveType::kRegisterToRegister;
} else {
DCHECK(destination->IsAnyStackSlot());
return MoveType::kRegisterToStack;
}
} else {
DCHECK(source->IsAnyStackSlot());
if (destination->IsAnyRegister()) {
return MoveType::kStackToRegister;
} else {
DCHECK(destination->IsAnyStackSlot());
return MoveType::kStackToStack;
}
}
}
CodeGenerator::MoveType::Type CodeGenerator::MoveType::InferSwap(
InstructionOperand* source, InstructionOperand* destination) {
DCHECK(LocationOperand::cast(source)->IsCompatible(
LocationOperand::cast(destination)));
if (source->IsAnyRegister()) {
if (destination->IsAnyRegister()) {
return MoveType::kRegisterToRegister;
} else {
DCHECK(destination->IsAnyStackSlot());
return MoveType::kRegisterToStack;
}
} else {
DCHECK(source->IsAnyStackSlot());
DCHECK(destination->IsAnyStackSlot());
return MoveType::kStackToStack;
}
}
RpoNumber CodeGenerator::ComputeBranchInfo(BranchInfo* branch,
Instruction* instr) {
// Assemble a branch after this instruction.
InstructionOperandConverter i(this, instr);
RpoNumber true_rpo = i.InputRpo(instr->InputCount() - 2);
RpoNumber false_rpo = i.InputRpo(instr->InputCount() - 1);
if (true_rpo == false_rpo) {
return true_rpo;
}
FlagsCondition condition = FlagsConditionField::decode(instr->opcode());
if (IsNextInAssemblyOrder(true_rpo)) {
// true block is next, can fall through if condition negated.
std::swap(true_rpo, false_rpo);
condition = NegateFlagsCondition(condition);
}
branch->condition = condition;
branch->true_label = GetLabel(true_rpo);
branch->false_label = GetLabel(false_rpo);
branch->fallthru = IsNextInAssemblyOrder(false_rpo);
return RpoNumber::Invalid();
}
CodeGenerator::CodeGenResult CodeGenerator::AssembleInstruction(
int instruction_index, const InstructionBlock* block) {
Instruction* instr = instructions()->InstructionAt(instruction_index);
if (info()->trace_turbo_json()) {
instr_starts_[instruction_index].gap_pc_offset = tasm()->pc_offset();
}
int first_unused_stack_slot;
FlagsMode mode = FlagsModeField::decode(instr->opcode());
if (mode != kFlags_trap) {
AssembleSourcePosition(instr);
}
bool adjust_stack =
GetSlotAboveSPBeforeTailCall(instr, &first_unused_stack_slot);
if (adjust_stack) AssembleTailCallBeforeGap(instr, first_unused_stack_slot);
AssembleGaps(instr);
if (adjust_stack) AssembleTailCallAfterGap(instr, first_unused_stack_slot);
DCHECK_IMPLIES(
block->must_deconstruct_frame(),
instr != instructions()->InstructionAt(block->last_instruction_index()) ||
instr->IsRet() || instr->IsJump());
if (instr->IsJump() && block->must_deconstruct_frame()) {
AssembleDeconstructFrame();
}
if (info()->trace_turbo_json()) {
instr_starts_[instruction_index].arch_instr_pc_offset = tasm()->pc_offset();
}
// Assemble architecture-specific code for the instruction.
CodeGenResult result = AssembleArchInstruction(instr);
if (result != kSuccess) return result;
if (info()->trace_turbo_json()) {
instr_starts_[instruction_index].condition_pc_offset = tasm()->pc_offset();
}
FlagsCondition condition = FlagsConditionField::decode(instr->opcode());
switch (mode) {
case kFlags_branch:
case kFlags_branch_and_poison: {
BranchInfo branch;
RpoNumber target = ComputeBranchInfo(&branch, instr);
if (target.IsValid()) {
// redundant branch.
if (!IsNextInAssemblyOrder(target)) {
AssembleArchJump(target);
}
return kSuccess;
}
// Assemble architecture-specific branch.
AssembleArchBranch(instr, &branch);
break;
}
case kFlags_deoptimize:
case kFlags_deoptimize_and_poison: {
// Assemble a conditional eager deoptimization after this instruction.
InstructionOperandConverter i(this, instr);
size_t frame_state_offset = MiscField::decode(instr->opcode());
DeoptimizationExit* const exit =
AddDeoptimizationExit(instr, frame_state_offset);
Label continue_label;
BranchInfo branch;
branch.condition = condition;
branch.true_label = exit->label();
branch.false_label = &continue_label;
branch.fallthru = true;
// Assemble architecture-specific branch.
AssembleArchDeoptBranch(instr, &branch);
tasm()->bind(&continue_label);
if (mode == kFlags_deoptimize_and_poison) {
AssembleBranchPoisoning(NegateFlagsCondition(branch.condition), instr);
}
break;
}
case kFlags_set: {
// Assemble a boolean materialization after this instruction.
AssembleArchBoolean(instr, condition);
break;
}
case kFlags_trap: {
AssembleArchTrap(instr, condition);
break;
}
case kFlags_none: {
break;
}
}
// TODO(jarin) We should thread the flag through rather than set it.
if (instr->IsCall()) {
ResetSpeculationPoison();
}
return kSuccess;
}
void CodeGenerator::AssembleSourcePosition(Instruction* instr) {
SourcePosition source_position = SourcePosition::Unknown();
if (instr->IsNop() && instr->AreMovesRedundant()) return;
if (!instructions()->GetSourcePosition(instr, &source_position)) return;
AssembleSourcePosition(source_position);
}
void CodeGenerator::AssembleSourcePosition(SourcePosition source_position) {
if (source_position == current_source_position_) return;
current_source_position_ = source_position;
if (!source_position.IsKnown()) return;
source_position_table_builder_.AddPosition(tasm()->pc_offset(),
source_position, false);
if (FLAG_code_comments) {
OptimizedCompilationInfo* info = this->info();
if (!info->IsOptimizing() && !info->IsWasm()) return;
std::ostringstream buffer;
buffer << "-- ";
// Turbolizer only needs the source position, as it can reconstruct
// the inlining stack from other information.
if (info->trace_turbo_json() || !tasm()->isolate() ||
tasm()->isolate()->concurrent_recompilation_enabled()) {
buffer << source_position;
} else {
AllowHeapAllocation allocation;
AllowHandleAllocation handles;
AllowHandleDereference deref;
buffer << source_position.InliningStack(info);
}
buffer << " --";
tasm()->RecordComment(buffer.str().c_str());
}
}
bool CodeGenerator::GetSlotAboveSPBeforeTailCall(Instruction* instr,
int* slot) {
if (instr->IsTailCall()) {
InstructionOperandConverter g(this, instr);
*slot = g.InputInt32(instr->InputCount() - 1);
return true;
} else {
return false;
}
}
StubCallMode CodeGenerator::DetermineStubCallMode() const {
CodeKind code_kind = info()->code_kind();
return (code_kind == CodeKind::WASM_FUNCTION ||
code_kind == CodeKind::WASM_TO_CAPI_FUNCTION ||
code_kind == CodeKind::WASM_TO_JS_FUNCTION)
? StubCallMode::kCallWasmRuntimeStub
: StubCallMode::kCallCodeObject;
}
void CodeGenerator::AssembleGaps(Instruction* instr) {
for (int i = Instruction::FIRST_GAP_POSITION;
i <= Instruction::LAST_GAP_POSITION; i++) {
Instruction::GapPosition inner_pos =
static_cast<Instruction::GapPosition>(i);
ParallelMove* move = instr->GetParallelMove(inner_pos);
if (move != nullptr) resolver()->Resolve(move);
}
}
namespace {
Handle<PodArray<InliningPosition>> CreateInliningPositions(
OptimizedCompilationInfo* info, Isolate* isolate) {
const OptimizedCompilationInfo::InlinedFunctionList& inlined_functions =
info->inlined_functions();
if (inlined_functions.size() == 0) {
return Handle<PodArray<InliningPosition>>::cast(
isolate->factory()->empty_byte_array());
}
Handle<PodArray<InliningPosition>> inl_positions =
PodArray<InliningPosition>::New(
isolate, static_cast<int>(inlined_functions.size()),
AllocationType::kOld);
for (size_t i = 0; i < inlined_functions.size(); ++i) {
inl_positions->set(static_cast<int>(i), inlined_functions[i].position);
}
return inl_positions;
}
} // namespace
Handle<DeoptimizationData> CodeGenerator::GenerateDeoptimizationData() {
OptimizedCompilationInfo* info = this->info();
int deopt_count = static_cast<int>(deoptimization_exits_.size());
if (deopt_count == 0 && !info->is_osr()) {
return DeoptimizationData::Empty(isolate());
}
Handle<DeoptimizationData> data =
DeoptimizationData::New(isolate(), deopt_count, AllocationType::kOld);
Handle<ByteArray> translation_array =
translations_.CreateByteArray(isolate()->factory());
data->SetTranslationByteArray(*translation_array);
data->SetInlinedFunctionCount(
Smi::FromInt(static_cast<int>(inlined_function_count_)));
data->SetOptimizationId(Smi::FromInt(info->optimization_id()));
data->SetDeoptExitStart(Smi::FromInt(deopt_exit_start_offset_));
data->SetNonLazyDeoptCount(Smi::FromInt(non_lazy_deopt_count_));
if (info->has_shared_info()) {
data->SetSharedFunctionInfo(*info->shared_info());
} else {
data->SetSharedFunctionInfo(Smi::zero());
}
Handle<FixedArray> literals = isolate()->factory()->NewFixedArray(
static_cast<int>(deoptimization_literals_.size()), AllocationType::kOld);
for (unsigned i = 0; i < deoptimization_literals_.size(); i++) {
Handle<Object> object = deoptimization_literals_[i].Reify(isolate());
CHECK(!object.is_null());
literals->set(i, *object);
}
data->SetLiteralArray(*literals);
Handle<PodArray<InliningPosition>> inl_pos =
CreateInliningPositions(info, isolate());
data->SetInliningPositions(*inl_pos);
if (info->is_osr()) {
DCHECK_LE(0, osr_pc_offset_);
data->SetOsrBytecodeOffset(Smi::FromInt(info_->osr_offset().ToInt()));
data->SetOsrPcOffset(Smi::FromInt(osr_pc_offset_));
} else {
BailoutId osr_offset = BailoutId::None();
data->SetOsrBytecodeOffset(Smi::FromInt(osr_offset.ToInt()));
data->SetOsrPcOffset(Smi::FromInt(-1));
}
// Populate deoptimization entries.
for (int i = 0; i < deopt_count; i++) {
DeoptimizationExit* deoptimization_exit = deoptimization_exits_[i];
CHECK_NOT_NULL(deoptimization_exit);
DCHECK_EQ(i, deoptimization_exit->deoptimization_id());
data->SetBytecodeOffset(i, deoptimization_exit->bailout_id());
data->SetTranslationIndex(
i, Smi::FromInt(deoptimization_exit->translation_id()));
data->SetPc(i, Smi::FromInt(deoptimization_exit->pc_offset()));
}
return data;
}
Label* CodeGenerator::AddJumpTable(Label** targets, size_t target_count) {
jump_tables_ = zone()->New<JumpTable>(jump_tables_, targets, target_count);
return jump_tables_->label();
}
void CodeGenerator::RecordCallPosition(Instruction* instr) {
const bool needs_frame_state =
instr->HasCallDescriptorFlag(CallDescriptor::kNeedsFrameState);
RecordSafepoint(instr->reference_map(), needs_frame_state
? Safepoint::kLazyDeopt
: Safepoint::kNoLazyDeopt);
if (instr->HasCallDescriptorFlag(CallDescriptor::kHasExceptionHandler)) {
InstructionOperandConverter i(this, instr);
RpoNumber handler_rpo = i.InputRpo(instr->InputCount() - 1);
DCHECK(instructions()->InstructionBlockAt(handler_rpo)->IsHandler());
handlers_.push_back(
{GetLabel(handler_rpo), tasm()->pc_offset_for_safepoint()});
}
if (needs_frame_state) {
MarkLazyDeoptSite();
// If the frame state is present, it starts at argument 2 - after
// the code address and the poison-alias index.
size_t frame_state_offset = 2;
FrameStateDescriptor* descriptor =
GetDeoptimizationEntry(instr, frame_state_offset).descriptor();
int pc_offset = tasm()->pc_offset_for_safepoint();
BuildTranslation(instr, pc_offset, frame_state_offset,
descriptor->state_combine());
}
}
int CodeGenerator::DefineDeoptimizationLiteral(DeoptimizationLiteral literal) {
literal.Validate();
int result = static_cast<int>(deoptimization_literals_.size());
for (unsigned i = 0; i < deoptimization_literals_.size(); ++i) {
deoptimization_literals_[i].Validate();
if (deoptimization_literals_[i] == literal) return i;
}
deoptimization_literals_.push_back(literal);
return result;
}
DeoptimizationEntry const& CodeGenerator::GetDeoptimizationEntry(
Instruction* instr, size_t frame_state_offset) {
InstructionOperandConverter i(this, instr);
int const state_id = i.InputInt32(frame_state_offset);
return instructions()->GetDeoptimizationEntry(state_id);
}
void CodeGenerator::TranslateStateValueDescriptor(
StateValueDescriptor* desc, StateValueList* nested,
Translation* translation, InstructionOperandIterator* iter) {
// Note:
// If translation is null, we just skip the relevant instruction operands.
if (desc->IsNested()) {
if (translation != nullptr) {
translation->BeginCapturedObject(static_cast<int>(nested->size()));
}
for (auto field : *nested) {
TranslateStateValueDescriptor(field.desc, field.nested, translation,
iter);
}
} else if (desc->IsArgumentsElements()) {
if (translation != nullptr) {
translation->ArgumentsElements(desc->arguments_type());
}
} else if (desc->IsArgumentsLength()) {
if (translation != nullptr) {
translation->ArgumentsLength();
}
} else if (desc->IsDuplicate()) {
if (translation != nullptr) {
translation->DuplicateObject(static_cast<int>(desc->id()));
}
} else if (desc->IsPlain()) {
InstructionOperand* op = iter->Advance();
if (translation != nullptr) {
AddTranslationForOperand(translation, iter->instruction(), op,
desc->type());
}
} else {
DCHECK(desc->IsOptimizedOut());
if (translation != nullptr) {
if (optimized_out_literal_id_ == -1) {
optimized_out_literal_id_ = DefineDeoptimizationLiteral(
DeoptimizationLiteral(isolate()->factory()->optimized_out()));
}
translation->StoreLiteral(optimized_out_literal_id_);
}
}
}
void CodeGenerator::TranslateFrameStateDescriptorOperands(
FrameStateDescriptor* desc, InstructionOperandIterator* iter,
Translation* translation) {
size_t index = 0;
StateValueList* values = desc->GetStateValueDescriptors();
for (StateValueList::iterator it = values->begin(); it != values->end();
++it, ++index) {
TranslateStateValueDescriptor((*it).desc, (*it).nested, translation, iter);
}
DCHECK_EQ(desc->GetSize(), index);
}
void CodeGenerator::BuildTranslationForFrameStateDescriptor(
FrameStateDescriptor* descriptor, InstructionOperandIterator* iter,
Translation* translation, OutputFrameStateCombine state_combine) {
// Outer-most state must be added to translation first.
if (descriptor->outer_state() != nullptr) {
BuildTranslationForFrameStateDescriptor(descriptor->outer_state(), iter,
translation, state_combine);
}
Handle<SharedFunctionInfo> shared_info;
if (!descriptor->shared_info().ToHandle(&shared_info)) {
if (!info()->has_shared_info()) {
return; // Stub with no SharedFunctionInfo.
}
shared_info = info()->shared_info();
}
const BailoutId bailout_id = descriptor->bailout_id();
const int shared_info_id =
DefineDeoptimizationLiteral(DeoptimizationLiteral(shared_info));
const unsigned int height =
static_cast<unsigned int>(descriptor->GetHeight());
switch (descriptor->type()) {
case FrameStateType::kInterpretedFunction: {
int return_offset = 0;
int return_count = 0;
if (!state_combine.IsOutputIgnored()) {
return_offset = static_cast<int>(state_combine.GetOffsetToPokeAt());
return_count = static_cast<int>(iter->instruction()->OutputCount());
}
translation->BeginInterpretedFrame(bailout_id, shared_info_id, height,
return_offset, return_count);
break;
}
case FrameStateType::kArgumentsAdaptor:
translation->BeginArgumentsAdaptorFrame(shared_info_id, height);
break;
case FrameStateType::kConstructStub:
DCHECK(bailout_id.IsValidForConstructStub());
translation->BeginConstructStubFrame(bailout_id, shared_info_id, height);
break;
case FrameStateType::kBuiltinContinuation: {
translation->BeginBuiltinContinuationFrame(bailout_id, shared_info_id,
height);
break;
}
case FrameStateType::kJavaScriptBuiltinContinuation: {
translation->BeginJavaScriptBuiltinContinuationFrame(
bailout_id, shared_info_id, height);
break;
}
case FrameStateType::kJavaScriptBuiltinContinuationWithCatch: {
translation->BeginJavaScriptBuiltinContinuationWithCatchFrame(
bailout_id, shared_info_id, height);
break;
}
}
TranslateFrameStateDescriptorOperands(descriptor, iter, translation);
}
DeoptimizationExit* CodeGenerator::BuildTranslation(
Instruction* instr, int pc_offset, size_t frame_state_offset,
OutputFrameStateCombine state_combine) {
DeoptimizationEntry const& entry =
GetDeoptimizationEntry(instr, frame_state_offset);
FrameStateDescriptor* const descriptor = entry.descriptor();
frame_state_offset++;
int update_feedback_count = entry.feedback().IsValid() ? 1 : 0;
Translation translation(&translations_,
static_cast<int>(descriptor->GetFrameCount()),
static_cast<int>(descriptor->GetJSFrameCount()),
update_feedback_count, zone());
if (entry.feedback().IsValid()) {
DeoptimizationLiteral literal =
DeoptimizationLiteral(entry.feedback().vector);
int literal_id = DefineDeoptimizationLiteral(literal);
translation.AddUpdateFeedback(literal_id, entry.feedback().slot.ToInt());
}
InstructionOperandIterator iter(instr, frame_state_offset);
BuildTranslationForFrameStateDescriptor(descriptor, &iter, &translation,
state_combine);
DeoptimizationExit* const exit = zone()->New<DeoptimizationExit>(
current_source_position_, descriptor->bailout_id(), translation.index(),
pc_offset, entry.kind(), entry.reason());
if (!Deoptimizer::kSupportsFixedDeoptExitSizes) {
exit->set_deoptimization_id(next_deoptimization_id_++);
}
deoptimization_exits_.push_back(exit);
return exit;
}
void CodeGenerator::AddTranslationForOperand(Translation* translation,
Instruction* instr,
InstructionOperand* op,
MachineType type) {
if (op->IsStackSlot()) {
if (type.representation() == MachineRepresentation::kBit) {
translation->StoreBoolStackSlot(LocationOperand::cast(op)->index());
} else if (type == MachineType::Int8() || type == MachineType::Int16() ||
type == MachineType::Int32()) {
translation->StoreInt32StackSlot(LocationOperand::cast(op)->index());
} else if (type == MachineType::Uint8() || type == MachineType::Uint16() ||
type == MachineType::Uint32()) {
translation->StoreUint32StackSlot(LocationOperand::cast(op)->index());
} else if (type == MachineType::Int64()) {
translation->StoreInt64StackSlot(LocationOperand::cast(op)->index());
} else {
#if defined(V8_COMPRESS_POINTERS)
CHECK(MachineRepresentation::kTagged == type.representation() ||
MachineRepresentation::kCompressed == type.representation());
#else
CHECK(MachineRepresentation::kTagged == type.representation());
#endif
translation->StoreStackSlot(LocationOperand::cast(op)->index());
}
} else if (op->IsFPStackSlot()) {
if (type.representation() == MachineRepresentation::kFloat64) {
translation->StoreDoubleStackSlot(LocationOperand::cast(op)->index());
} else {
CHECK_EQ(MachineRepresentation::kFloat32, type.representation());
translation->StoreFloatStackSlot(LocationOperand::cast(op)->index());
}
} else if (op->IsRegister()) {
InstructionOperandConverter converter(this, instr);
if (type.representation() == MachineRepresentation::kBit) {
translation->StoreBoolRegister(converter.ToRegister(op));
} else if (type == MachineType::Int8() || type == MachineType::Int16() ||
type == MachineType::Int32()) {
translation->StoreInt32Register(converter.ToRegister(op));
} else if (type == MachineType::Uint8() || type == MachineType::Uint16() ||
type == MachineType::Uint32()) {
translation->StoreUint32Register(converter.ToRegister(op));
} else if (type == MachineType::Int64()) {
translation->StoreInt64Register(converter.ToRegister(op));
} else {
#if defined(V8_COMPRESS_POINTERS)
CHECK(MachineRepresentation::kTagged == type.representation() ||
MachineRepresentation::kCompressed == type.representation());
#else
CHECK(MachineRepresentation::kTagged == type.representation());
#endif
translation->StoreRegister(converter.ToRegister(op));
}
} else if (op->IsFPRegister()) {
InstructionOperandConverter converter(this, instr);
if (type.representation() == MachineRepresentation::kFloat64) {
translation->StoreDoubleRegister(converter.ToDoubleRegister(op));
} else {
CHECK_EQ(MachineRepresentation::kFloat32, type.representation());
translation->StoreFloatRegister(converter.ToFloatRegister(op));
}
} else {
CHECK(op->IsImmediate());
InstructionOperandConverter converter(this, instr);
Constant constant = converter.ToConstant(op);
DeoptimizationLiteral literal;
switch (constant.type()) {
case Constant::kInt32:
if (type.representation() == MachineRepresentation::kTagged) {
// When pointers are 4 bytes, we can use int32 constants to represent
// Smis.
DCHECK_EQ(4, kSystemPointerSize);
Smi smi(static_cast<Address>(constant.ToInt32()));
DCHECK(smi.IsSmi());
literal = DeoptimizationLiteral(smi.value());
} else if (type.representation() == MachineRepresentation::kBit) {
if (constant.ToInt32() == 0) {
literal =
DeoptimizationLiteral(isolate()->factory()->false_value());
} else {
DCHECK_EQ(1, constant.ToInt32());
literal = DeoptimizationLiteral(isolate()->factory()->true_value());
}
} else {
DCHECK(type == MachineType::Int32() ||
type == MachineType::Uint32() ||
type.representation() == MachineRepresentation::kWord32 ||
type.representation() == MachineRepresentation::kNone);
DCHECK(type.representation() != MachineRepresentation::kNone ||
constant.ToInt32() == FrameStateDescriptor::kImpossibleValue);
if (type == MachineType::Uint32()) {
literal = DeoptimizationLiteral(
static_cast<uint32_t>(constant.ToInt32()));
} else {
literal = DeoptimizationLiteral(constant.ToInt32());
}
}
break;
case Constant::kInt64:
DCHECK_EQ(8, kSystemPointerSize);
if (type.representation() == MachineRepresentation::kWord64) {
literal =
DeoptimizationLiteral(static_cast<double>(constant.ToInt64()));
} else {
// When pointers are 8 bytes, we can use int64 constants to represent
// Smis.
DCHECK_EQ(MachineRepresentation::kTagged, type.representation());
Smi smi(static_cast<Address>(constant.ToInt64()));
DCHECK(smi.IsSmi());
literal = DeoptimizationLiteral(smi.value());
}
break;
case Constant::kFloat32:
DCHECK(type.representation() == MachineRepresentation::kFloat32 ||
type.representation() == MachineRepresentation::kTagged);
literal = DeoptimizationLiteral(constant.ToFloat32());
break;
case Constant::kFloat64:
DCHECK(type.representation() == MachineRepresentation::kFloat64 ||
type.representation() == MachineRepresentation::kTagged);
literal = DeoptimizationLiteral(constant.ToFloat64().value());
break;
case Constant::kHeapObject:
DCHECK_EQ(MachineRepresentation::kTagged, type.representation());
literal = DeoptimizationLiteral(constant.ToHeapObject());
break;
case Constant::kCompressedHeapObject:
DCHECK_EQ(MachineType::AnyTagged(), type);
literal = DeoptimizationLiteral(constant.ToHeapObject());
break;
case Constant::kDelayedStringConstant:
DCHECK_EQ(MachineRepresentation::kTagged, type.representation());
literal = DeoptimizationLiteral(constant.ToDelayedStringConstant());
break;
default:
UNREACHABLE();
}
if (literal.object().equals(info()->closure())) {
translation->StoreJSFrameFunction();
} else {
int literal_id = DefineDeoptimizationLiteral(literal);
translation->StoreLiteral(literal_id);
}
}
}
void CodeGenerator::MarkLazyDeoptSite() {
last_lazy_deopt_pc_ = tasm()->pc_offset();
}
DeoptimizationExit* CodeGenerator::AddDeoptimizationExit(
Instruction* instr, size_t frame_state_offset) {
return BuildTranslation(instr, -1, frame_state_offset,
OutputFrameStateCombine::Ignore());
}
void CodeGenerator::InitializeSpeculationPoison() {
if (poisoning_level_ == PoisoningMitigationLevel::kDontPoison) return;
// Initialize {kSpeculationPoisonRegister} either by comparing the expected
// with the actual call target, or by unconditionally using {-1} initially.
// Masking register arguments with it only makes sense in the first case.
if (info()->called_with_code_start_register()) {
tasm()->RecordComment("-- Prologue: generate speculation poison --");
GenerateSpeculationPoisonFromCodeStartRegister();
if (info()->poison_register_arguments()) {
AssembleRegisterArgumentPoisoning();
}
} else {
ResetSpeculationPoison();
}
}
void CodeGenerator::ResetSpeculationPoison() {
if (poisoning_level_ != PoisoningMitigationLevel::kDontPoison) {
tasm()->ResetSpeculationPoisonRegister();
}
}
OutOfLineCode::OutOfLineCode(CodeGenerator* gen)
: frame_(gen->frame()), tasm_(gen->tasm()), next_(gen->ools_) {
gen->ools_ = this;
}
OutOfLineCode::~OutOfLineCode() = default;
Handle<Object> DeoptimizationLiteral::Reify(Isolate* isolate) const {
Validate();
switch (kind_) {
case DeoptimizationLiteralKind::kObject: {
return object_;
}
case DeoptimizationLiteralKind::kNumber: {
return isolate->factory()->NewNumber(number_);
}
case DeoptimizationLiteralKind::kString: {
return string_->AllocateStringConstant(isolate);
}
case DeoptimizationLiteralKind::kInvalid: {
UNREACHABLE();
}
}
UNREACHABLE();
}
} // namespace compiler
} // namespace internal
} // namespace v8