// Copyright 2015 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/code-assembler.h"

#include <ostream>

#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
#include "src/codegen/machine-type.h"
#include "src/compiler/backend/instruction-selector.h"
#include "src/compiler/graph.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/linkage.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/pipeline.h"
#include "src/compiler/raw-machine-assembler.h"
#include "src/compiler/schedule.h"
#include "src/handles/handles-inl.h"
#include "src/heap/factory-inl.h"
#include "src/numbers/conversions-inl.h"
#include "src/objects/smi.h"
#include "src/utils/memcopy.h"
#include "src/zone/zone.h"

namespace v8 {
namespace internal {

constexpr MachineType MachineTypeOf<Smi>::value;
constexpr MachineType MachineTypeOf<Object>::value;
constexpr MachineType MachineTypeOf<MaybeObject>::value;

namespace compiler {

static_assert(std::is_convertible<TNode<Number>, TNode<Object>>::value,
              "test subtyping");
static_assert(
    std::is_convertible<TNode<Number>, TNode<UnionT<Smi, HeapObject>>>::value,
    "test subtyping");
static_assert(
    !std::is_convertible<TNode<UnionT<Smi, HeapObject>>, TNode<Number>>::value,
    "test subtyping");

CodeAssemblerState::CodeAssemblerState(
    Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor,
    CodeKind kind, const char* name, Builtin builtin)
    // TODO(rmcilroy): Should we use Linkage::GetBytecodeDispatchDescriptor for
    // bytecode handlers?
    : CodeAssemblerState(
          isolate, zone,
          Linkage::GetStubCallDescriptor(
              zone, descriptor, descriptor.GetStackParameterCount(),
              CallDescriptor::kNoFlags, Operator::kNoProperties),
          kind, name, builtin) {}

CodeAssemblerState::CodeAssemblerState(Isolate* isolate, Zone* zone,
                                       int parameter_count, CodeKind kind,
                                       const char* name, Builtin builtin)
    : CodeAssemblerState(
          isolate, zone,
          Linkage::GetJSCallDescriptor(zone, false, parameter_count,
                                       CallDescriptor::kCanUseRoots),
          kind, name, builtin) {}

CodeAssemblerState::CodeAssemblerState(Isolate* isolate, Zone* zone,
                                       CallDescriptor* call_descriptor,
                                       CodeKind kind, const char* name,
                                       Builtin builtin)
    : raw_assembler_(new RawMachineAssembler(
          isolate, zone->New<Graph>(zone), call_descriptor,
          MachineType::PointerRepresentation(),
          InstructionSelector::SupportedMachineOperatorFlags(),
          InstructionSelector::AlignmentRequirements())),
      kind_(kind),
      name_(name),
      builtin_(builtin),
      code_generated_(false),
      variables_(zone),
      jsgraph_(zone->New<JSGraph>(
          isolate, raw_assembler_->graph(), raw_assembler_->common(),
          zone->New<JSOperatorBuilder>(zone), raw_assembler_->simplified(),
          raw_assembler_->machine())) {}

CodeAssemblerState::~CodeAssemblerState() = default;

int CodeAssemblerState::parameter_count() const {
  return static_cast<int>(raw_assembler_->call_descriptor()->ParameterCount());
}

CodeAssembler::~CodeAssembler() = default;

#if DEBUG
void CodeAssemblerState::PrintCurrentBlock(std::ostream& os) {
  raw_assembler_->PrintCurrentBlock(os);
}
#endif

bool CodeAssemblerState::InsideBlock() { return raw_assembler_->InsideBlock(); }

void CodeAssemblerState::SetInitialDebugInformation(const char* msg,
                                                    const char* file,
                                                    int line) {
#if DEBUG
  AssemblerDebugInfo debug_info = {msg, file, line};
  raw_assembler_->SetCurrentExternalSourcePosition({file, line});
  raw_assembler_->SetInitialDebugInformation(debug_info);
#endif  // DEBUG
}

class BreakOnNodeDecorator final : public GraphDecorator {
 public:
  explicit BreakOnNodeDecorator(NodeId node_id) : node_id_(node_id) {}

  void Decorate(Node* node) final {
    if (node->id() == node_id_) {
      base::OS::DebugBreak();
    }
  }

 private:
  NodeId node_id_;
};

void CodeAssembler::BreakOnNode(int node_id) {
  Graph* graph = raw_assembler()->graph();
  Zone* zone = graph->zone();
  GraphDecorator* decorator =
      zone->New<BreakOnNodeDecorator>(static_cast<NodeId>(node_id));
  graph->AddDecorator(decorator);
}

void CodeAssembler::RegisterCallGenerationCallbacks(
    const CodeAssemblerCallback& call_prologue,
    const CodeAssemblerCallback& call_epilogue) {
  // The callback can be registered only once.
  DCHECK(!state_->call_prologue_);
  DCHECK(!state_->call_epilogue_);
  state_->call_prologue_ = call_prologue;
  state_->call_epilogue_ = call_epilogue;
}

void CodeAssembler::UnregisterCallGenerationCallbacks() {
  state_->call_prologue_ = nullptr;
  state_->call_epilogue_ = nullptr;
}

void CodeAssembler::CallPrologue() {
  if (state_->call_prologue_) {
    state_->call_prologue_();
  }
}

void CodeAssembler::CallEpilogue() {
  if (state_->call_epilogue_) {
    state_->call_epilogue_();
  }
}

bool CodeAssembler::Word32ShiftIsSafe() const {
  return raw_assembler()->machine()->Word32ShiftIsSafe();
}

// static
Handle<Code> CodeAssembler::GenerateCode(
    CodeAssemblerState* state, const AssemblerOptions& options,
    const ProfileDataFromFile* profile_data) {
  DCHECK(!state->code_generated_);

  RawMachineAssembler* rasm = state->raw_assembler_.get();

  Handle<Code> code;
  Graph* graph = rasm->ExportForOptimization();

  code = Pipeline::GenerateCodeForCodeStub(
             rasm->isolate(), rasm->call_descriptor(), graph, state->jsgraph_,
             rasm->source_positions(), state->kind_, state->name_,
             state->builtin_, options, profile_data)
             .ToHandleChecked();

  state->code_generated_ = true;
  return code;
}

bool CodeAssembler::Is64() const { return raw_assembler()->machine()->Is64(); }
bool CodeAssembler::Is32() const { return raw_assembler()->machine()->Is32(); }

bool CodeAssembler::IsFloat64RoundUpSupported() const {
  return raw_assembler()->machine()->Float64RoundUp().IsSupported();
}

bool CodeAssembler::IsFloat64RoundDownSupported() const {
  return raw_assembler()->machine()->Float64RoundDown().IsSupported();
}

bool CodeAssembler::IsFloat64RoundTiesEvenSupported() const {
  return raw_assembler()->machine()->Float64RoundTiesEven().IsSupported();
}

bool CodeAssembler::IsFloat64RoundTruncateSupported() const {
  return raw_assembler()->machine()->Float64RoundTruncate().IsSupported();
}

bool CodeAssembler::IsInt32AbsWithOverflowSupported() const {
  return raw_assembler()->machine()->Int32AbsWithOverflow().IsSupported();
}

bool CodeAssembler::IsInt64AbsWithOverflowSupported() const {
  return raw_assembler()->machine()->Int64AbsWithOverflow().IsSupported();
}

bool CodeAssembler::IsIntPtrAbsWithOverflowSupported() const {
  return Is64() ? IsInt64AbsWithOverflowSupported()
                : IsInt32AbsWithOverflowSupported();
}

bool CodeAssembler::IsWord32PopcntSupported() const {
  return raw_assembler()->machine()->Word32Popcnt().IsSupported();
}

bool CodeAssembler::IsWord64PopcntSupported() const {
  return raw_assembler()->machine()->Word64Popcnt().IsSupported();
}

bool CodeAssembler::IsWord32CtzSupported() const {
  return raw_assembler()->machine()->Word32Ctz().IsSupported();
}

bool CodeAssembler::IsWord64CtzSupported() const {
  return raw_assembler()->machine()->Word64Ctz().IsSupported();
}

TNode<Int32T> CodeAssembler::UniqueInt32Constant(int32_t value) {
  return UncheckedCast<Int32T>(jsgraph()->UniqueInt32Constant(value));
}

TNode<Int32T> CodeAssembler::Int32Constant(int32_t value) {
  return UncheckedCast<Int32T>(jsgraph()->Int32Constant(value));
}

TNode<Int64T> CodeAssembler::Int64Constant(int64_t value) {
  return UncheckedCast<Int64T>(jsgraph()->Int64Constant(value));
}

TNode<IntPtrT> CodeAssembler::IntPtrConstant(intptr_t value) {
  return UncheckedCast<IntPtrT>(jsgraph()->IntPtrConstant(value));
}

TNode<TaggedIndex> CodeAssembler::TaggedIndexConstant(intptr_t value) {
  DCHECK(TaggedIndex::IsValid(value));
  return UncheckedCast<TaggedIndex>(raw_assembler()->IntPtrConstant(value));
}

TNode<Number> CodeAssembler::NumberConstant(double value) {
  int smi_value;
  if (DoubleToSmiInteger(value, &smi_value)) {
    return UncheckedCast<Number>(SmiConstant(smi_value));
  } else {
    // We allocate the heap number constant eagerly at this point instead of
    // deferring allocation to code generation
    // (see AllocateAndInstallRequestedHeapNumbers) since that makes it easier
    // to generate constant lookups for embedded builtins.
    return UncheckedCast<Number>(HeapConstant(
        isolate()->factory()->NewHeapNumberForCodeAssembler(value)));
  }
}

TNode<Smi> CodeAssembler::SmiConstant(Smi value) {
  return UncheckedCast<Smi>(BitcastWordToTaggedSigned(
      IntPtrConstant(static_cast<intptr_t>(value.ptr()))));
}

TNode<Smi> CodeAssembler::SmiConstant(int value) {
  return SmiConstant(Smi::FromInt(value));
}

TNode<HeapObject> CodeAssembler::UntypedHeapConstant(
    Handle<HeapObject> object) {
  return UncheckedCast<HeapObject>(jsgraph()->HeapConstant(object));
}

TNode<String> CodeAssembler::StringConstant(const char* str) {
  Handle<String> internalized_string =
      factory()->InternalizeString(base::OneByteVector(str));
  return UncheckedCast<String>(HeapConstant(internalized_string));
}

TNode<Oddball> CodeAssembler::BooleanConstant(bool value) {
  Handle<Object> object = isolate()->factory()->ToBoolean(value);
  return UncheckedCast<Oddball>(
      jsgraph()->HeapConstant(Handle<HeapObject>::cast(object)));
}

TNode<ExternalReference> CodeAssembler::ExternalConstant(
    ExternalReference address) {
  return UncheckedCast<ExternalReference>(
      raw_assembler()->ExternalConstant(address));
}

TNode<Float32T> CodeAssembler::Float32Constant(double value) {
  return UncheckedCast<Float32T>(jsgraph()->Float32Constant(value));
}

TNode<Float64T> CodeAssembler::Float64Constant(double value) {
  return UncheckedCast<Float64T>(jsgraph()->Float64Constant(value));
}

bool CodeAssembler::IsMapOffsetConstant(Node* node) {
  return raw_assembler()->IsMapOffsetConstant(node);
}

bool CodeAssembler::TryToInt32Constant(TNode<IntegralT> node,
                                       int32_t* out_value) {
  {
    Int64Matcher m(node);
    if (m.HasResolvedValue() &&
        m.IsInRange(std::numeric_limits<int32_t>::min(),
                    std::numeric_limits<int32_t>::max())) {
      *out_value = static_cast<int32_t>(m.ResolvedValue());
      return true;
    }
  }

  {
    Int32Matcher m(node);
    if (m.HasResolvedValue()) {
      *out_value = m.ResolvedValue();
      return true;
    }
  }

  return false;
}

bool CodeAssembler::TryToInt64Constant(TNode<IntegralT> node,
                                       int64_t* out_value) {
  Int64Matcher m(node);
  if (m.HasResolvedValue()) *out_value = m.ResolvedValue();
  return m.HasResolvedValue();
}

bool CodeAssembler::TryToSmiConstant(TNode<Smi> tnode, Smi* out_value) {
  Node* node = tnode;
  if (node->opcode() == IrOpcode::kBitcastWordToTaggedSigned) {
    node = node->InputAt(0);
  }
  return TryToSmiConstant(ReinterpretCast<IntPtrT>(tnode), out_value);
}

bool CodeAssembler::TryToSmiConstant(TNode<IntegralT> node, Smi* out_value) {
  IntPtrMatcher m(node);
  if (m.HasResolvedValue()) {
    intptr_t value = m.ResolvedValue();
    // Make sure that the value is actually a smi
    CHECK_EQ(0, value & ((static_cast<intptr_t>(1) << kSmiShiftSize) - 1));
    *out_value = Smi(static_cast<Address>(value));
    return true;
  }
  return false;
}

bool CodeAssembler::TryToIntPtrConstant(TNode<Smi> tnode, intptr_t* out_value) {
  Node* node = tnode;
  if (node->opcode() == IrOpcode::kBitcastWordToTaggedSigned ||
      node->opcode() == IrOpcode::kBitcastWordToTagged) {
    node = node->InputAt(0);
  }
  return TryToIntPtrConstant(ReinterpretCast<IntPtrT>(tnode), out_value);
}

bool CodeAssembler::TryToIntPtrConstant(TNode<IntegralT> node,
                                        intptr_t* out_value) {
  IntPtrMatcher m(node);
  if (m.HasResolvedValue()) *out_value = m.ResolvedValue();
  return m.HasResolvedValue();
}

bool CodeAssembler::IsUndefinedConstant(TNode<Object> node) {
  compiler::HeapObjectMatcher m(node);
  return m.Is(isolate()->factory()->undefined_value());
}

bool CodeAssembler::IsNullConstant(TNode<Object> node) {
  compiler::HeapObjectMatcher m(node);
  return m.Is(isolate()->factory()->null_value());
}

Node* CodeAssembler::UntypedParameter(int index) {
  if (index == kTargetParameterIndex) return raw_assembler()->TargetParameter();
  return raw_assembler()->Parameter(index);
}

bool CodeAssembler::IsJSFunctionCall() const {
  auto call_descriptor = raw_assembler()->call_descriptor();
  return call_descriptor->IsJSFunctionCall();
}

TNode<Context> CodeAssembler::GetJSContextParameter() {
  auto call_descriptor = raw_assembler()->call_descriptor();
  DCHECK(call_descriptor->IsJSFunctionCall());
  return Parameter<Context>(Linkage::GetJSCallContextParamIndex(
      static_cast<int>(call_descriptor->JSParameterCount())));
}

void CodeAssembler::Return(TNode<Object> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(0).IsTagged());
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<Object> value1, TNode<Object> value2) {
  DCHECK_EQ(2, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(0).IsTagged());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(1).IsTagged());
  return raw_assembler()->Return(value1, value2);
}

void CodeAssembler::Return(TNode<Object> value1, TNode<Object> value2,
                           TNode<Object> value3) {
  DCHECK_EQ(3, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(0).IsTagged());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(1).IsTagged());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(2).IsTagged());
  return raw_assembler()->Return(value1, value2, value3);
}

void CodeAssembler::Return(TNode<Int32T> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(MachineType::Int32(),
            raw_assembler()->call_descriptor()->GetReturnType(0));
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<Uint32T> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(MachineType::Uint32(),
            raw_assembler()->call_descriptor()->GetReturnType(0));
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<WordT> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(
      MachineType::PointerRepresentation(),
      raw_assembler()->call_descriptor()->GetReturnType(0).representation());
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<Float32T> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(MachineType::Float32(),
            raw_assembler()->call_descriptor()->GetReturnType(0));
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<Float64T> value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(MachineType::Float64(),
            raw_assembler()->call_descriptor()->GetReturnType(0));
  return raw_assembler()->Return(value);
}

void CodeAssembler::Return(TNode<WordT> value1, TNode<WordT> value2) {
  DCHECK_EQ(2, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(
      MachineType::PointerRepresentation(),
      raw_assembler()->call_descriptor()->GetReturnType(0).representation());
  DCHECK_EQ(
      MachineType::PointerRepresentation(),
      raw_assembler()->call_descriptor()->GetReturnType(1).representation());
  return raw_assembler()->Return(value1, value2);
}

void CodeAssembler::Return(TNode<WordT> value1, TNode<Object> value2) {
  DCHECK_EQ(2, raw_assembler()->call_descriptor()->ReturnCount());
  DCHECK_EQ(
      MachineType::PointerRepresentation(),
      raw_assembler()->call_descriptor()->GetReturnType(0).representation());
  DCHECK(raw_assembler()->call_descriptor()->GetReturnType(1).IsTagged());
  return raw_assembler()->Return(value1, value2);
}

void CodeAssembler::PopAndReturn(Node* pop, Node* value) {
  DCHECK_EQ(1, raw_assembler()->call_descriptor()->ReturnCount());
  return raw_assembler()->PopAndReturn(pop, value);
}

void CodeAssembler::ReturnIf(TNode<BoolT> condition, TNode<Object> value) {
  Label if_return(this), if_continue(this);
  Branch(condition, &if_return, &if_continue);
  Bind(&if_return);
  Return(value);
  Bind(&if_continue);
}

void CodeAssembler::AbortCSADcheck(Node* message) {
  raw_assembler()->AbortCSADcheck(message);
}

void CodeAssembler::DebugBreak() { raw_assembler()->DebugBreak(); }

void CodeAssembler::Unreachable() {
  DebugBreak();
  raw_assembler()->Unreachable();
}

void CodeAssembler::Comment(std::string str) {
  if (!v8_flags.code_comments) return;
  raw_assembler()->Comment(str);
}

void CodeAssembler::StaticAssert(TNode<BoolT> value, const char* source) {
  raw_assembler()->StaticAssert(value, source);
}

void CodeAssembler::SetSourcePosition(const char* file, int line) {
  raw_assembler()->SetCurrentExternalSourcePosition({file, line});
}

void CodeAssembler::PushSourcePosition() {
  auto position = raw_assembler()->GetCurrentExternalSourcePosition();
  state_->macro_call_stack_.push_back(position);
}

void CodeAssembler::PopSourcePosition() {
  state_->macro_call_stack_.pop_back();
}

const std::vector<FileAndLine>& CodeAssembler::GetMacroSourcePositionStack()
    const {
  return state_->macro_call_stack_;
}

void CodeAssembler::Bind(Label* label) { return label->Bind(); }

#if DEBUG
void CodeAssembler::Bind(Label* label, AssemblerDebugInfo debug_info) {
  return label->Bind(debug_info);
}
#endif  // DEBUG

TNode<RawPtrT> CodeAssembler::LoadFramePointer() {
  return UncheckedCast<RawPtrT>(raw_assembler()->LoadFramePointer());
}

TNode<RawPtrT> CodeAssembler::LoadParentFramePointer() {
  return UncheckedCast<RawPtrT>(raw_assembler()->LoadParentFramePointer());
}

#define DEFINE_CODE_ASSEMBLER_BINARY_OP(name, ResType, Arg1Type, Arg2Type)   \
  TNode<ResType> CodeAssembler::name(TNode<Arg1Type> a, TNode<Arg2Type> b) { \
    return UncheckedCast<ResType>(raw_assembler()->name(a, b));              \
  }
CODE_ASSEMBLER_BINARY_OP_LIST(DEFINE_CODE_ASSEMBLER_BINARY_OP)
#undef DEFINE_CODE_ASSEMBLER_BINARY_OP

TNode<WordT> CodeAssembler::WordShl(TNode<WordT> value, int shift) {
  return (shift != 0) ? WordShl(value, IntPtrConstant(shift)) : value;
}

TNode<WordT> CodeAssembler::WordShr(TNode<WordT> value, int shift) {
  return (shift != 0) ? WordShr(value, IntPtrConstant(shift)) : value;
}

TNode<WordT> CodeAssembler::WordSar(TNode<WordT> value, int shift) {
  return (shift != 0) ? WordSar(value, IntPtrConstant(shift)) : value;
}

TNode<Word32T> CodeAssembler::Word32Shr(TNode<Word32T> value, int shift) {
  return (shift != 0) ? Word32Shr(value, Int32Constant(shift)) : value;
}

TNode<Word32T> CodeAssembler::Word32Sar(TNode<Word32T> value, int shift) {
  return (shift != 0) ? Word32Sar(value, Int32Constant(shift)) : value;
}

#define CODE_ASSEMBLER_COMPARE(Name, ArgT, VarT, ToConstant, op)          \
  TNode<BoolT> CodeAssembler::Name(TNode<ArgT> left, TNode<ArgT> right) { \
    VarT lhs, rhs;                                                        \
    if (ToConstant(left, &lhs) && ToConstant(right, &rhs)) {              \
      return BoolConstant(lhs op rhs);                                    \
    }                                                                     \
    return UncheckedCast<BoolT>(raw_assembler()->Name(left, right));      \
  }

CODE_ASSEMBLER_COMPARE(IntPtrEqual, WordT, intptr_t, TryToIntPtrConstant, ==)
CODE_ASSEMBLER_COMPARE(WordEqual, WordT, intptr_t, TryToIntPtrConstant, ==)
CODE_ASSEMBLER_COMPARE(WordNotEqual, WordT, intptr_t, TryToIntPtrConstant, !=)
CODE_ASSEMBLER_COMPARE(Word32Equal, Word32T, int32_t, TryToInt32Constant, ==)
CODE_ASSEMBLER_COMPARE(Word32NotEqual, Word32T, int32_t, TryToInt32Constant, !=)
CODE_ASSEMBLER_COMPARE(Word64Equal, Word64T, int64_t, TryToInt64Constant, ==)
CODE_ASSEMBLER_COMPARE(Word64NotEqual, Word64T, int64_t, TryToInt64Constant, !=)
#undef CODE_ASSEMBLER_COMPARE

TNode<UintPtrT> CodeAssembler::ChangeUint32ToWord(TNode<Word32T> value) {
  if (raw_assembler()->machine()->Is64()) {
    return UncheckedCast<UintPtrT>(
        raw_assembler()->ChangeUint32ToUint64(value));
  }
  return ReinterpretCast<UintPtrT>(value);
}

TNode<IntPtrT> CodeAssembler::ChangeInt32ToIntPtr(TNode<Word32T> value) {
  if (raw_assembler()->machine()->Is64()) {
    return UncheckedCast<IntPtrT>(raw_assembler()->ChangeInt32ToInt64(value));
  }
  return ReinterpretCast<IntPtrT>(value);
}

TNode<IntPtrT> CodeAssembler::ChangeFloat64ToIntPtr(TNode<Float64T> value) {
  if (raw_assembler()->machine()->Is64()) {
    return UncheckedCast<IntPtrT>(raw_assembler()->ChangeFloat64ToInt64(value));
  }
  return UncheckedCast<IntPtrT>(raw_assembler()->ChangeFloat64ToInt32(value));
}

TNode<UintPtrT> CodeAssembler::ChangeFloat64ToUintPtr(TNode<Float64T> value) {
  if (raw_assembler()->machine()->Is64()) {
    return UncheckedCast<UintPtrT>(
        raw_assembler()->ChangeFloat64ToUint64(value));
  }
  return UncheckedCast<UintPtrT>(raw_assembler()->ChangeFloat64ToUint32(value));
}

TNode<Float64T> CodeAssembler::ChangeUintPtrToFloat64(TNode<UintPtrT> value) {
  if (raw_assembler()->machine()->Is64()) {
    // TODO(turbofan): Maybe we should introduce a ChangeUint64ToFloat64
    // machine operator to TurboFan here?
    return UncheckedCast<Float64T>(
        raw_assembler()->RoundUint64ToFloat64(value));
  }
  return UncheckedCast<Float64T>(raw_assembler()->ChangeUint32ToFloat64(value));
}

TNode<Float64T> CodeAssembler::RoundIntPtrToFloat64(Node* value) {
  if (raw_assembler()->machine()->Is64()) {
    return UncheckedCast<Float64T>(raw_assembler()->RoundInt64ToFloat64(value));
  }
  return UncheckedCast<Float64T>(raw_assembler()->ChangeInt32ToFloat64(value));
}

TNode<Int32T> CodeAssembler::TruncateFloat32ToInt32(TNode<Float32T> value) {
  return UncheckedCast<Int32T>(raw_assembler()->TruncateFloat32ToInt32(
      value, TruncateKind::kSetOverflowToMin));
}
#define DEFINE_CODE_ASSEMBLER_UNARY_OP(name, ResType, ArgType) \
  TNode<ResType> CodeAssembler::name(TNode<ArgType> a) {       \
    return UncheckedCast<ResType>(raw_assembler()->name(a));   \
  }
CODE_ASSEMBLER_UNARY_OP_LIST(DEFINE_CODE_ASSEMBLER_UNARY_OP)
#undef DEFINE_CODE_ASSEMBLER_UNARY_OP

Node* CodeAssembler::Load(MachineType type, Node* base) {
  return raw_assembler()->Load(type, base);
}

Node* CodeAssembler::Load(MachineType type, Node* base, Node* offset) {
  return raw_assembler()->Load(type, base, offset);
}

TNode<Object> CodeAssembler::LoadFullTagged(Node* base) {
  return BitcastWordToTagged(Load<RawPtrT>(base));
}

TNode<Object> CodeAssembler::LoadFullTagged(Node* base, TNode<IntPtrT> offset) {
  // Please use LoadFromObject(MachineType::MapInHeader(), object,
  // IntPtrConstant(-kHeapObjectTag)) instead.
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  return BitcastWordToTagged(Load<RawPtrT>(base, offset));
}

Node* CodeAssembler::AtomicLoad(MachineType type, AtomicMemoryOrder order,
                                TNode<RawPtrT> base, TNode<WordT> offset) {
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  return raw_assembler()->AtomicLoad(AtomicLoadParameters(type, order), base,
                                     offset);
}

template <class Type>
TNode<Type> CodeAssembler::AtomicLoad64(AtomicMemoryOrder order,
                                        TNode<RawPtrT> base,
                                        TNode<WordT> offset) {
  return UncheckedCast<Type>(raw_assembler()->AtomicLoad64(
      AtomicLoadParameters(MachineType::Uint64(), order), base, offset));
}

template TNode<AtomicInt64> CodeAssembler::AtomicLoad64<AtomicInt64>(
    AtomicMemoryOrder order, TNode<RawPtrT> base, TNode<WordT> offset);
template TNode<AtomicUint64> CodeAssembler::AtomicLoad64<AtomicUint64>(
    AtomicMemoryOrder order, TNode<RawPtrT> base, TNode<WordT> offset);

Node* CodeAssembler::LoadFromObject(MachineType type, TNode<Object> object,
                                    TNode<IntPtrT> offset) {
  return raw_assembler()->LoadFromObject(type, object, offset);
}

#ifdef V8_MAP_PACKING
Node* CodeAssembler::PackMapWord(Node* value) {
  TNode<IntPtrT> map_word =
      BitcastTaggedToWordForTagAndSmiBits(UncheckedCast<AnyTaggedT>(value));
  TNode<WordT> packed = WordXor(UncheckedCast<WordT>(map_word),
                                IntPtrConstant(Internals::kMapWordXorMask));
  return BitcastWordToTaggedSigned(packed);
}
#endif

TNode<AnyTaggedT> CodeAssembler::LoadRootMapWord(RootIndex root_index) {
#ifdef V8_MAP_PACKING
  Handle<Object> root = isolate()->root_handle(root_index);
  Node* map = HeapConstant(Handle<Map>::cast(root));
  map = PackMapWord(map);
  return ReinterpretCast<AnyTaggedT>(map);
#else
  return LoadRoot(root_index);
#endif
}

TNode<Object> CodeAssembler::LoadRoot(RootIndex root_index) {
  if (RootsTable::IsImmortalImmovable(root_index)) {
    Handle<Object> root = isolate()->root_handle(root_index);
    if (root->IsSmi()) {
      return SmiConstant(Smi::cast(*root));
    } else {
      return HeapConstant(Handle<HeapObject>::cast(root));
    }
  }

  // TODO(jgruber): In theory we could generate better code for this by
  // letting the macro assembler decide how to load from the roots list. In most
  // cases, it would boil down to loading from a fixed kRootRegister offset.
  TNode<ExternalReference> isolate_root =
      ExternalConstant(ExternalReference::isolate_root(isolate()));
  int offset = IsolateData::root_slot_offset(root_index);
  return UncheckedCast<Object>(
      LoadFullTagged(isolate_root, IntPtrConstant(offset)));
}

Node* CodeAssembler::UnalignedLoad(MachineType type, TNode<RawPtrT> base,
                                   TNode<WordT> offset) {
  return raw_assembler()->UnalignedLoad(type, static_cast<Node*>(base), offset);
}

void CodeAssembler::Store(Node* base, Node* value) {
  raw_assembler()->Store(MachineRepresentation::kTagged, base, value,
                         kFullWriteBarrier);
}

void CodeAssembler::StoreToObject(MachineRepresentation rep,
                                  TNode<Object> object, TNode<IntPtrT> offset,
                                  Node* value,
                                  StoreToObjectWriteBarrier write_barrier) {
  WriteBarrierKind write_barrier_kind;
  switch (write_barrier) {
    case StoreToObjectWriteBarrier::kFull:
      write_barrier_kind = WriteBarrierKind::kFullWriteBarrier;
      break;
    case StoreToObjectWriteBarrier::kMap:
      write_barrier_kind = WriteBarrierKind::kMapWriteBarrier;
      break;
    case StoreToObjectWriteBarrier::kNone:
      if (CanBeTaggedPointer(rep)) {
        write_barrier_kind = WriteBarrierKind::kAssertNoWriteBarrier;
      } else {
        write_barrier_kind = WriteBarrierKind::kNoWriteBarrier;
      }
      break;
  }
  raw_assembler()->StoreToObject(rep, object, offset, value,
                                 write_barrier_kind);
}

void CodeAssembler::OptimizedStoreField(MachineRepresentation rep,
                                        TNode<HeapObject> object, int offset,
                                        Node* value) {
  raw_assembler()->OptimizedStoreField(rep, object, offset, value,
                                       WriteBarrierKind::kFullWriteBarrier);
}

void CodeAssembler::OptimizedStoreFieldAssertNoWriteBarrier(
    MachineRepresentation rep, TNode<HeapObject> object, int offset,
    Node* value) {
  raw_assembler()->OptimizedStoreField(rep, object, offset, value,
                                       WriteBarrierKind::kAssertNoWriteBarrier);
}

void CodeAssembler::OptimizedStoreFieldUnsafeNoWriteBarrier(
    MachineRepresentation rep, TNode<HeapObject> object, int offset,
    Node* value) {
  raw_assembler()->OptimizedStoreField(rep, object, offset, value,
                                       WriteBarrierKind::kNoWriteBarrier);
}

void CodeAssembler::OptimizedStoreMap(TNode<HeapObject> object,
                                      TNode<Map> map) {
  raw_assembler()->OptimizedStoreMap(object, map);
}

void CodeAssembler::Store(Node* base, Node* offset, Node* value) {
  // Please use OptimizedStoreMap(base, value) instead.
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  raw_assembler()->Store(MachineRepresentation::kTagged, base, offset, value,
                         kFullWriteBarrier);
}

void CodeAssembler::StoreEphemeronKey(Node* base, Node* offset, Node* value) {
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  raw_assembler()->Store(MachineRepresentation::kTagged, base, offset, value,
                         kEphemeronKeyWriteBarrier);
}

void CodeAssembler::StoreNoWriteBarrier(MachineRepresentation rep, Node* base,
                                        Node* value) {
  raw_assembler()->Store(
      rep, base, value,
      CanBeTaggedPointer(rep) ? kAssertNoWriteBarrier : kNoWriteBarrier);
}

void CodeAssembler::StoreNoWriteBarrier(MachineRepresentation rep, Node* base,
                                        Node* offset, Node* value) {
  // Please use OptimizedStoreMap(base, value) instead.
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  raw_assembler()->Store(
      rep, base, offset, value,
      CanBeTaggedPointer(rep) ? kAssertNoWriteBarrier : kNoWriteBarrier);
}

void CodeAssembler::UnsafeStoreNoWriteBarrier(MachineRepresentation rep,
                                              Node* base, Node* value) {
  raw_assembler()->Store(rep, base, value, kNoWriteBarrier);
}

void CodeAssembler::UnsafeStoreNoWriteBarrier(MachineRepresentation rep,
                                              Node* base, Node* offset,
                                              Node* value) {
  // Please use OptimizedStoreMap(base, value) instead.
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  raw_assembler()->Store(rep, base, offset, value, kNoWriteBarrier);
}

void CodeAssembler::StoreFullTaggedNoWriteBarrier(TNode<RawPtrT> base,
                                                  TNode<Object> tagged_value) {
  StoreNoWriteBarrier(MachineType::PointerRepresentation(), base,
                      BitcastTaggedToWord(tagged_value));
}

void CodeAssembler::StoreFullTaggedNoWriteBarrier(TNode<RawPtrT> base,
                                                  TNode<IntPtrT> offset,
                                                  TNode<Object> tagged_value) {
  // Please use OptimizedStoreMap(base, tagged_value) instead.
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  StoreNoWriteBarrier(MachineType::PointerRepresentation(), base, offset,
                      BitcastTaggedToWord(tagged_value));
}

void CodeAssembler::AtomicStore(MachineRepresentation rep,
                                AtomicMemoryOrder order, TNode<RawPtrT> base,
                                TNode<WordT> offset, TNode<Word32T> value) {
  DCHECK(!raw_assembler()->IsMapOffsetConstantMinusTag(offset));
  raw_assembler()->AtomicStore(
      AtomicStoreParameters(rep, WriteBarrierKind::kNoWriteBarrier, order),
      base, offset, value);
}

void CodeAssembler::AtomicStore64(AtomicMemoryOrder order, TNode<RawPtrT> base,
                                  TNode<WordT> offset, TNode<UintPtrT> value,
                                  TNode<UintPtrT> value_high) {
  raw_assembler()->AtomicStore64(
      AtomicStoreParameters(MachineRepresentation::kWord64,
                            WriteBarrierKind::kNoWriteBarrier, order),
      base, offset, value, value_high);
}

#define ATOMIC_FUNCTION(name)                                                 \
  TNode<Word32T> CodeAssembler::Atomic##name(                                 \
      MachineType type, TNode<RawPtrT> base, TNode<UintPtrT> offset,          \
      TNode<Word32T> value) {                                                 \
    return UncheckedCast<Word32T>(                                            \
        raw_assembler()->Atomic##name(type, base, offset, value));            \
  }                                                                           \
  template <class Type>                                                       \
  TNode<Type> CodeAssembler::Atomic##name##64(                                \
      TNode<RawPtrT> base, TNode<UintPtrT> offset, TNode<UintPtrT> value,     \
      TNode<UintPtrT> value_high) {                                           \
    return UncheckedCast<Type>(                                               \
        raw_assembler()->Atomic##name##64(base, offset, value, value_high));  \
  }                                                                           \
  template TNode<AtomicInt64> CodeAssembler::Atomic##name##64 < AtomicInt64 > \
      (TNode<RawPtrT> base, TNode<UintPtrT> offset, TNode<UintPtrT> value,    \
       TNode<UintPtrT> value_high);                                           \
  template TNode<AtomicUint64> CodeAssembler::Atomic##name##64 <              \
      AtomicUint64 > (TNode<RawPtrT> base, TNode<UintPtrT> offset,            \
                      TNode<UintPtrT> value, TNode<UintPtrT> value_high);
ATOMIC_FUNCTION(Add)
ATOMIC_FUNCTION(Sub)
ATOMIC_FUNCTION(And)
ATOMIC_FUNCTION(Or)
ATOMIC_FUNCTION(Xor)
ATOMIC_FUNCTION(Exchange)
#undef ATOMIC_FUNCTION

TNode<Word32T> CodeAssembler::AtomicCompareExchange(MachineType type,
                                                    TNode<RawPtrT> base,
                                                    TNode<WordT> offset,
                                                    TNode<Word32T> old_value,
                                                    TNode<Word32T> new_value) {
  return UncheckedCast<Word32T>(raw_assembler()->AtomicCompareExchange(
      type, base, offset, old_value, new_value));
}

template <class Type>
TNode<Type> CodeAssembler::AtomicCompareExchange64(
    TNode<RawPtrT> base, TNode<WordT> offset, TNode<UintPtrT> old_value,
    TNode<UintPtrT> new_value, TNode<UintPtrT> old_value_high,
    TNode<UintPtrT> new_value_high) {
  // This uses Uint64() intentionally: AtomicCompareExchange is not implemented
  // for Int64(), which is fine because the machine instruction only cares
  // about words.
  return UncheckedCast<Type>(raw_assembler()->AtomicCompareExchange64(
      base, offset, old_value, old_value_high, new_value, new_value_high));
}

template TNode<AtomicInt64> CodeAssembler::AtomicCompareExchange64<AtomicInt64>(
    TNode<RawPtrT> base, TNode<WordT> offset, TNode<UintPtrT> old_value,
    TNode<UintPtrT> new_value, TNode<UintPtrT> old_value_high,
    TNode<UintPtrT> new_value_high);
template TNode<AtomicUint64>
CodeAssembler::AtomicCompareExchange64<AtomicUint64>(
    TNode<RawPtrT> base, TNode<WordT> offset, TNode<UintPtrT> old_value,
    TNode<UintPtrT> new_value, TNode<UintPtrT> old_value_high,
    TNode<UintPtrT> new_value_high);

void CodeAssembler::MemoryBarrier(AtomicMemoryOrder order) {
  raw_assembler()->MemoryBarrier(order);
}

void CodeAssembler::StoreRoot(RootIndex root_index, TNode<Object> value) {
  DCHECK(!RootsTable::IsImmortalImmovable(root_index));
  TNode<ExternalReference> isolate_root =
      ExternalConstant(ExternalReference::isolate_root(isolate()));
  int offset = IsolateData::root_slot_offset(root_index);
  StoreFullTaggedNoWriteBarrier(isolate_root, IntPtrConstant(offset), value);
}

Node* CodeAssembler::Projection(int index, Node* value) {
  DCHECK_LT(index, value->op()->ValueOutputCount());
  return raw_assembler()->Projection(index, value);
}

TNode<HeapObject> CodeAssembler::OptimizedAllocate(
    TNode<IntPtrT> size, AllocationType allocation,
    AllowLargeObjects allow_large_objects) {
  return UncheckedCast<HeapObject>(raw_assembler()->OptimizedAllocate(
      size, allocation, allow_large_objects));
}

void CodeAssembler::HandleException(Node* node) {
  if (state_->exception_handler_labels_.size() == 0) return;
  CodeAssemblerExceptionHandlerLabel* label =
      state_->exception_handler_labels_.back();

  if (node->op()->HasProperty(Operator::kNoThrow)) {
    return;
  }

  Label success(this), exception(this, Label::kDeferred);
  success.MergeVariables();
  exception.MergeVariables();

  raw_assembler()->Continuations(node, success.label_, exception.label_);

  Bind(&exception);
  const Operator* op = raw_assembler()->common()->IfException();
  Node* exception_value = raw_assembler()->AddNode(op, node, node);
  label->AddInputs({UncheckedCast<Object>(exception_value)});
  Goto(label->plain_label());

  Bind(&success);
  raw_assembler()->AddNode(raw_assembler()->common()->IfSuccess(), node);
}

namespace {
template <size_t kMaxSize>
class NodeArray {
 public:
  void Add(Node* node) {
    DCHECK_GT(kMaxSize, size());
    *ptr_++ = node;
  }

  Node* const* data() const { return arr_; }
  int size() const { return static_cast<int>(ptr_ - arr_); }

 private:
  Node* arr_[kMaxSize];
  Node** ptr_ = arr_;
};
}  // namespace

Node* CodeAssembler::CallRuntimeImpl(
    Runtime::FunctionId function, TNode<Object> context,
    std::initializer_list<TNode<Object>> args) {
  int result_size = Runtime::FunctionForId(function)->result_size;
  TNode<Code> centry =
      HeapConstant(CodeFactory::RuntimeCEntry(isolate(), result_size));
  constexpr size_t kMaxNumArgs = 6;
  DCHECK_GE(kMaxNumArgs, args.size());
  int argc = static_cast<int>(args.size());
  auto call_descriptor = Linkage::GetRuntimeCallDescriptor(
      zone(), function, argc, Operator::kNoProperties,
      Runtime::MayAllocate(function) ? CallDescriptor::kNoFlags
                                     : CallDescriptor::kNoAllocate);

  TNode<ExternalReference> ref =
      ExternalConstant(ExternalReference::Create(function));
  TNode<Int32T> arity = Int32Constant(argc);

  NodeArray<kMaxNumArgs + 4> inputs;
  inputs.Add(centry);
  for (auto arg : args) inputs.Add(arg);
  inputs.Add(ref);
  inputs.Add(arity);
  inputs.Add(context);

  CallPrologue();
  Node* return_value =
      raw_assembler()->CallN(call_descriptor, inputs.size(), inputs.data());
  HandleException(return_value);
  CallEpilogue();
  return return_value;
}

void CodeAssembler::TailCallRuntimeImpl(
    Runtime::FunctionId function, TNode<Int32T> arity, TNode<Object> context,
    std::initializer_list<TNode<Object>> args) {
  int result_size = Runtime::FunctionForId(function)->result_size;
  TNode<Code> centry =
      HeapConstant(CodeFactory::RuntimeCEntry(isolate(), result_size));
  constexpr size_t kMaxNumArgs = 6;
  DCHECK_GE(kMaxNumArgs, args.size());
  int argc = static_cast<int>(args.size());
  auto call_descriptor = Linkage::GetRuntimeCallDescriptor(
      zone(), function, argc, Operator::kNoProperties,
      CallDescriptor::kNoFlags);

  TNode<ExternalReference> ref =
      ExternalConstant(ExternalReference::Create(function));

  NodeArray<kMaxNumArgs + 4> inputs;
  inputs.Add(centry);
  for (auto arg : args) inputs.Add(arg);
  inputs.Add(ref);
  inputs.Add(arity);
  inputs.Add(context);

  raw_assembler()->TailCallN(call_descriptor, inputs.size(), inputs.data());
}

Node* CodeAssembler::CallStubN(StubCallMode call_mode,
                               const CallInterfaceDescriptor& descriptor,
                               int input_count, Node* const* inputs) {
  DCHECK(call_mode == StubCallMode::kCallCodeObject ||
         call_mode == StubCallMode::kCallBuiltinPointer);

  // implicit nodes are target and optionally context.
  int implicit_nodes = descriptor.HasContextParameter() ? 2 : 1;
  DCHECK_LE(implicit_nodes, input_count);
  int argc = input_count - implicit_nodes;
#ifdef DEBUG
  if (descriptor.AllowVarArgs()) {
    DCHECK_LE(descriptor.GetParameterCount(), argc);
  } else {
    DCHECK_EQ(descriptor.GetParameterCount(), argc);
  }
#endif
  // Extra arguments not mentioned in the descriptor are passed on the stack.
  int stack_parameter_count = argc - descriptor.GetRegisterParameterCount();
  DCHECK_LE(descriptor.GetStackParameterCount(), stack_parameter_count);

  auto call_descriptor = Linkage::GetStubCallDescriptor(
      zone(), descriptor, stack_parameter_count, CallDescriptor::kNoFlags,
      Operator::kNoProperties, call_mode);

  CallPrologue();
  Node* return_value =
      raw_assembler()->CallN(call_descriptor, input_count, inputs);
  HandleException(return_value);
  CallEpilogue();
  return return_value;
}

void CodeAssembler::TailCallStubImpl(const CallInterfaceDescriptor& descriptor,
                                     TNode<Code> target, TNode<Object> context,
                                     std::initializer_list<Node*> args) {
  constexpr size_t kMaxNumArgs = 11;
  DCHECK_GE(kMaxNumArgs, args.size());
  DCHECK_EQ(descriptor.GetParameterCount(), args.size());
  auto call_descriptor = Linkage::GetStubCallDescriptor(
      zone(), descriptor, descriptor.GetStackParameterCount(),
      CallDescriptor::kNoFlags, Operator::kNoProperties);

  NodeArray<kMaxNumArgs + 2> inputs;
  inputs.Add(target);
  for (auto arg : args) inputs.Add(arg);
  if (descriptor.HasContextParameter()) {
    inputs.Add(context);
  }

  raw_assembler()->TailCallN(call_descriptor, inputs.size(), inputs.data());
}

Node* CodeAssembler::CallStubRImpl(StubCallMode call_mode,
                                   const CallInterfaceDescriptor& descriptor,
                                   TNode<Object> target, TNode<Object> context,
                                   std::initializer_list<Node*> args) {
  DCHECK(call_mode == StubCallMode::kCallCodeObject ||
         call_mode == StubCallMode::kCallBuiltinPointer);

  constexpr size_t kMaxNumArgs = 10;
  DCHECK_GE(kMaxNumArgs, args.size());

  NodeArray<kMaxNumArgs + 2> inputs;
  inputs.Add(target);
  for (auto arg : args) inputs.Add(arg);
  if (descriptor.HasContextParameter()) {
    inputs.Add(context);
  }

  return CallStubN(call_mode, descriptor, inputs.size(), inputs.data());
}

Node* CodeAssembler::CallJSStubImpl(const CallInterfaceDescriptor& descriptor,
                                    TNode<Object> target, TNode<Object> context,
                                    TNode<Object> function,
                                    base::Optional<TNode<Object>> new_target,
                                    TNode<Int32T> arity,
                                    std::initializer_list<Node*> args) {
  constexpr size_t kMaxNumArgs = 10;
  DCHECK_GE(kMaxNumArgs, args.size());
  NodeArray<kMaxNumArgs + 5> inputs;
  inputs.Add(target);
  inputs.Add(function);
  if (new_target) {
    inputs.Add(*new_target);
  }
  inputs.Add(arity);
  for (auto arg : args) inputs.Add(arg);
  if (descriptor.HasContextParameter()) {
    inputs.Add(context);
  }
  return CallStubN(StubCallMode::kCallCodeObject, descriptor, inputs.size(),
                   inputs.data());
}

void CodeAssembler::TailCallStubThenBytecodeDispatchImpl(
    const CallInterfaceDescriptor& descriptor, Node* target, Node* context,
    std::initializer_list<Node*> args) {
  constexpr size_t kMaxNumArgs = 6;
  DCHECK_GE(kMaxNumArgs, args.size());

  DCHECK_LE(descriptor.GetParameterCount(), args.size());
  int argc = static_cast<int>(args.size());
  // Extra arguments not mentioned in the descriptor are passed on the stack.
  int stack_parameter_count = argc - descriptor.GetRegisterParameterCount();
  DCHECK_LE(descriptor.GetStackParameterCount(), stack_parameter_count);
  auto call_descriptor = Linkage::GetStubCallDescriptor(
      zone(), descriptor, stack_parameter_count, CallDescriptor::kNoFlags,
      Operator::kNoProperties);

  NodeArray<kMaxNumArgs + 2> inputs;
  inputs.Add(target);
  for (auto arg : args) inputs.Add(arg);
  inputs.Add(context);

  raw_assembler()->TailCallN(call_descriptor, inputs.size(), inputs.data());
}

template <class... TArgs>
void CodeAssembler::TailCallBytecodeDispatch(
    const CallInterfaceDescriptor& descriptor, TNode<RawPtrT> target,
    TArgs... args) {
  DCHECK_EQ(descriptor.GetParameterCount(), sizeof...(args));
  auto call_descriptor = Linkage::GetBytecodeDispatchCallDescriptor(
      zone(), descriptor, descriptor.GetStackParameterCount());

  Node* nodes[] = {target, args...};
  CHECK_EQ(descriptor.GetParameterCount() + 1, arraysize(nodes));
  raw_assembler()->TailCallN(call_descriptor, arraysize(nodes), nodes);
}

// Instantiate TailCallBytecodeDispatch() for argument counts used by
// CSA-generated code
template V8_EXPORT_PRIVATE void CodeAssembler::TailCallBytecodeDispatch(
    const CallInterfaceDescriptor& descriptor, TNode<RawPtrT> target,
    TNode<Object>, TNode<IntPtrT>, TNode<BytecodeArray>,
    TNode<ExternalReference>);

void CodeAssembler::TailCallJSCode(TNode<Code> code, TNode<Context> context,
                                   TNode<JSFunction> function,
                                   TNode<Object> new_target,
                                   TNode<Int32T> arg_count) {
  JSTrampolineDescriptor descriptor;
  auto call_descriptor = Linkage::GetStubCallDescriptor(
      zone(), descriptor, descriptor.GetStackParameterCount(),
      CallDescriptor::kFixedTargetRegister, Operator::kNoProperties);

  Node* nodes[] = {code, function, new_target, arg_count, context};
  CHECK_EQ(descriptor.GetParameterCount() + 2, arraysize(nodes));
  raw_assembler()->TailCallN(call_descriptor, arraysize(nodes), nodes);
}

Node* CodeAssembler::CallCFunctionN(Signature<MachineType>* signature,
                                    int input_count, Node* const* inputs) {
  auto call_descriptor = Linkage::GetSimplifiedCDescriptor(zone(), signature);
  return raw_assembler()->CallN(call_descriptor, input_count, inputs);
}

Node* CodeAssembler::CallCFunction(
    Node* function, base::Optional<MachineType> return_type,
    std::initializer_list<CodeAssembler::CFunctionArg> args) {
  return raw_assembler()->CallCFunction(function, return_type, args);
}

Node* CodeAssembler::CallCFunctionWithoutFunctionDescriptor(
    Node* function, MachineType return_type,
    std::initializer_list<CodeAssembler::CFunctionArg> args) {
  return raw_assembler()->CallCFunctionWithoutFunctionDescriptor(
      function, return_type, args);
}

Node* CodeAssembler::CallCFunctionWithCallerSavedRegisters(
    Node* function, MachineType return_type, SaveFPRegsMode mode,
    std::initializer_list<CodeAssembler::CFunctionArg> args) {
  DCHECK(return_type.LessThanOrEqualPointerSize());
  return raw_assembler()->CallCFunctionWithCallerSavedRegisters(
      function, return_type, mode, args);
}

void CodeAssembler::Goto(Label* label) {
  label->MergeVariables();
  raw_assembler()->Goto(label->label_);
}

void CodeAssembler::GotoIf(TNode<IntegralT> condition, Label* true_label) {
  Label false_label(this);
  Branch(condition, true_label, &false_label);
  Bind(&false_label);
}

void CodeAssembler::GotoIfNot(TNode<IntegralT> condition, Label* false_label) {
  Label true_label(this);
  Branch(condition, &true_label, false_label);
  Bind(&true_label);
}

void CodeAssembler::Branch(TNode<IntegralT> condition, Label* true_label,
                           Label* false_label) {
  int32_t constant;
  if (TryToInt32Constant(condition, &constant)) {
    if ((true_label->is_used() || true_label->is_bound()) &&
        (false_label->is_used() || false_label->is_bound())) {
      return Goto(constant ? true_label : false_label);
    }
  }
  true_label->MergeVariables();
  false_label->MergeVariables();
  return raw_assembler()->Branch(condition, true_label->label_,
                                 false_label->label_);
}

void CodeAssembler::Branch(TNode<BoolT> condition,
                           const std::function<void()>& true_body,
                           const std::function<void()>& false_body) {
  int32_t constant;
  if (TryToInt32Constant(condition, &constant)) {
    return constant ? true_body() : false_body();
  }

  Label vtrue(this), vfalse(this);
  Branch(condition, &vtrue, &vfalse);

  Bind(&vtrue);
  true_body();

  Bind(&vfalse);
  false_body();
}

void CodeAssembler::Branch(TNode<BoolT> condition, Label* true_label,
                           const std::function<void()>& false_body) {
  int32_t constant;
  if (TryToInt32Constant(condition, &constant)) {
    return constant ? Goto(true_label) : false_body();
  }

  Label vfalse(this);
  Branch(condition, true_label, &vfalse);
  Bind(&vfalse);
  false_body();
}

void CodeAssembler::Branch(TNode<BoolT> condition,
                           const std::function<void()>& true_body,
                           Label* false_label) {
  int32_t constant;
  if (TryToInt32Constant(condition, &constant)) {
    return constant ? true_body() : Goto(false_label);
  }

  Label vtrue(this);
  Branch(condition, &vtrue, false_label);
  Bind(&vtrue);
  true_body();
}

void CodeAssembler::Switch(Node* index, Label* default_label,
                           const int32_t* case_values, Label** case_labels,
                           size_t case_count) {
  RawMachineLabel** labels = zone()->NewArray<RawMachineLabel*>(case_count);
  for (size_t i = 0; i < case_count; ++i) {
    labels[i] = case_labels[i]->label_;
    case_labels[i]->MergeVariables();
  }
  default_label->MergeVariables();
  return raw_assembler()->Switch(index, default_label->label_, case_values,
                                 labels, case_count);
}

bool CodeAssembler::UnalignedLoadSupported(MachineRepresentation rep) const {
  return raw_assembler()->machine()->UnalignedLoadSupported(rep);
}
bool CodeAssembler::UnalignedStoreSupported(MachineRepresentation rep) const {
  return raw_assembler()->machine()->UnalignedStoreSupported(rep);
}

// RawMachineAssembler delegate helpers:
Isolate* CodeAssembler::isolate() const { return raw_assembler()->isolate(); }

Factory* CodeAssembler::factory() const { return isolate()->factory(); }

Zone* CodeAssembler::zone() const { return raw_assembler()->zone(); }

bool CodeAssembler::IsExceptionHandlerActive() const {
  return state_->exception_handler_labels_.size() != 0;
}

RawMachineAssembler* CodeAssembler::raw_assembler() const {
  return state_->raw_assembler_.get();
}

JSGraph* CodeAssembler::jsgraph() const { return state_->jsgraph_; }

// The core implementation of Variable is stored through an indirection so
// that it can outlive the often block-scoped Variable declarations. This is
// needed to ensure that variable binding and merging through phis can
// properly be verified.
class CodeAssemblerVariable::Impl : public ZoneObject {
 public:
  explicit Impl(MachineRepresentation rep, CodeAssemblerState::VariableId id)
      :
#if DEBUG
        debug_info_(AssemblerDebugInfo(nullptr, nullptr, -1)),
#endif
        value_(nullptr),
        rep_(rep),
        var_id_(id) {
  }

#if DEBUG
  AssemblerDebugInfo debug_info() const { return debug_info_; }
  void set_debug_info(AssemblerDebugInfo debug_info) {
    debug_info_ = debug_info;
  }

  AssemblerDebugInfo debug_info_;
#endif  // DEBUG
  bool operator<(const CodeAssemblerVariable::Impl& other) const {
    return var_id_ < other.var_id_;
  }
  Node* value_;
  MachineRepresentation rep_;
  CodeAssemblerState::VariableId var_id_;
};

bool CodeAssemblerVariable::ImplComparator::operator()(
    const CodeAssemblerVariable::Impl* a,
    const CodeAssemblerVariable::Impl* b) const {
  return *a < *b;
}

CodeAssemblerVariable::CodeAssemblerVariable(CodeAssembler* assembler,
                                             MachineRepresentation rep)
    : impl_(assembler->zone()->New<Impl>(rep,
                                         assembler->state()->NextVariableId())),
      state_(assembler->state()) {
  state_->variables_.insert(impl_);
}

CodeAssemblerVariable::CodeAssemblerVariable(CodeAssembler* assembler,
                                             MachineRepresentation rep,
                                             Node* initial_value)
    : CodeAssemblerVariable(assembler, rep) {
  Bind(initial_value);
}

#if DEBUG
CodeAssemblerVariable::CodeAssemblerVariable(CodeAssembler* assembler,
                                             AssemblerDebugInfo debug_info,
                                             MachineRepresentation rep)
    : impl_(assembler->zone()->New<Impl>(rep,
                                         assembler->state()->NextVariableId())),
      state_(assembler->state()) {
  impl_->set_debug_info(debug_info);
  state_->variables_.insert(impl_);
}

CodeAssemblerVariable::CodeAssemblerVariable(CodeAssembler* assembler,
                                             AssemblerDebugInfo debug_info,
                                             MachineRepresentation rep,
                                             Node* initial_value)
    : CodeAssemblerVariable(assembler, debug_info, rep) {
  impl_->set_debug_info(debug_info);
  Bind(initial_value);
}
#endif  // DEBUG

CodeAssemblerVariable::~CodeAssemblerVariable() {
  state_->variables_.erase(impl_);
}

void CodeAssemblerVariable::Bind(Node* value) { impl_->value_ = value; }

Node* CodeAssemblerVariable::value() const {
#if DEBUG
  if (!IsBound()) {
    std::stringstream str;
    str << "#Use of unbound variable:"
        << "#\n    Variable:      " << *this << "#\n    Current Block: ";
    state_->PrintCurrentBlock(str);
    FATAL("%s", str.str().c_str());
  }
  if (!state_->InsideBlock()) {
    std::stringstream str;
    str << "#Accessing variable value outside a block:"
        << "#\n    Variable:      " << *this;
    FATAL("%s", str.str().c_str());
  }
#endif  // DEBUG
  return impl_->value_;
}

MachineRepresentation CodeAssemblerVariable::rep() const { return impl_->rep_; }

bool CodeAssemblerVariable::IsBound() const { return impl_->value_ != nullptr; }

std::ostream& operator<<(std::ostream& os,
                         const CodeAssemblerVariable::Impl& impl) {
#if DEBUG
  AssemblerDebugInfo info = impl.debug_info();
  if (info.name) os << "V" << info;
#endif  // DEBUG
  return os;
}

std::ostream& operator<<(std::ostream& os,
                         const CodeAssemblerVariable& variable) {
  os << *variable.impl_;
  return os;
}

CodeAssemblerLabel::CodeAssemblerLabel(CodeAssembler* assembler,
                                       size_t vars_count,
                                       CodeAssemblerVariable* const* vars,
                                       CodeAssemblerLabel::Type type)
    : bound_(false),
      merge_count_(0),
      state_(assembler->state()),
      label_(nullptr) {
  label_ = assembler->zone()->New<RawMachineLabel>(
      type == kDeferred ? RawMachineLabel::kDeferred
                        : RawMachineLabel::kNonDeferred);
  for (size_t i = 0; i < vars_count; ++i) {
    variable_phis_[vars[i]->impl_] = nullptr;
  }
}

CodeAssemblerLabel::~CodeAssemblerLabel() { label_->~RawMachineLabel(); }

void CodeAssemblerLabel::MergeVariables() {
  ++merge_count_;
  for (CodeAssemblerVariable::Impl* var : state_->variables_) {
    size_t count = 0;
    Node* node = var->value_;
    if (node != nullptr) {
      auto i = variable_merges_.find(var);
      if (i != variable_merges_.end()) {
        i->second.push_back(node);
        count = i->second.size();
      } else {
        count = 1;
        variable_merges_[var] = std::vector<Node*>(1, node);
      }
    }
    // If the following asserts, then you've jumped to a label without a bound
    // variable along that path that expects to merge its value into a phi.
    // This can also occur if a label is bound that is never jumped to.
    DCHECK(variable_phis_.find(var) == variable_phis_.end() ||
           count == merge_count_);
    USE(count);

    // If the label is already bound, we already know the set of variables to
    // merge and phi nodes have already been created.
    if (bound_) {
      auto phi = variable_phis_.find(var);
      if (phi != variable_phis_.end()) {
        DCHECK_NOT_NULL(phi->second);
        state_->raw_assembler_->AppendPhiInput(phi->second, node);
      } else {
        auto i = variable_merges_.find(var);
        if (i != variable_merges_.end()) {
          // If the following assert fires, then you've declared a variable that
          // has the same bound value along all paths up until the point you
          // bound this label, but then later merged a path with a new value for
          // the variable after the label bind (it's not possible to add phis to
          // the bound label after the fact, just make sure to list the variable
          // in the label's constructor's list of merged variables).
#if DEBUG
          if (find_if(i->second.begin(), i->second.end(),
                      [node](Node* e) -> bool { return node != e; }) !=
              i->second.end()) {
            std::stringstream str;
            str << "Unmerged variable found when jumping to block. \n"
                << "#    Variable:      " << *var;
            if (bound_) {
              str << "\n#    Target block:  " << *label_->block();
            }
            str << "\n#    Current Block: ";
            state_->PrintCurrentBlock(str);
            FATAL("%s", str.str().c_str());
          }
#endif  // DEBUG
        }
      }
    }
  }
}

#if DEBUG
void CodeAssemblerLabel::Bind(AssemblerDebugInfo debug_info) {
  if (bound_) {
    std::stringstream str;
    str << "Cannot bind the same label twice:"
        << "\n#    current:  " << debug_info
        << "\n#    previous: " << *label_->block();
    FATAL("%s", str.str().c_str());
  }
  if (v8_flags.enable_source_at_csa_bind) {
    state_->raw_assembler_->SetCurrentExternalSourcePosition(
        {debug_info.file, debug_info.line});
  }
  state_->raw_assembler_->Bind(label_, debug_info);
  UpdateVariablesAfterBind();
}
#endif  // DEBUG

void CodeAssemblerLabel::Bind() {
  DCHECK(!bound_);
  state_->raw_assembler_->Bind(label_);
  UpdateVariablesAfterBind();
}

void CodeAssemblerLabel::UpdateVariablesAfterBind() {
  // Make sure that all variables that have changed along any path up to this
  // point are marked as merge variables.
  for (auto var : state_->variables_) {
    Node* shared_value = nullptr;
    auto i = variable_merges_.find(var);
    if (i != variable_merges_.end()) {
      for (auto value : i->second) {
        DCHECK_NOT_NULL(value);
        if (value != shared_value) {
          if (shared_value == nullptr) {
            shared_value = value;
          } else {
            variable_phis_[var] = nullptr;
          }
        }
      }
    }
  }

  for (auto var : variable_phis_) {
    CodeAssemblerVariable::Impl* var_impl = var.first;
    auto i = variable_merges_.find(var_impl);
#if DEBUG
    bool not_found = i == variable_merges_.end();
    if (not_found || i->second.size() != merge_count_) {
      std::stringstream str;
      str << "A variable that has been marked as beeing merged at the label"
          << "\n# doesn't have a bound value along all of the paths that "
          << "\n# have been merged into the label up to this point."
          << "\n#"
          << "\n# This can happen in the following cases:"
          << "\n# - By explicitly marking it so in the label constructor"
          << "\n# - By having seen different bound values at branches"
          << "\n#"
          << "\n# Merge count:     expected=" << merge_count_
          << " vs. found=" << (not_found ? 0 : i->second.size())
          << "\n# Variable:      " << *var_impl
          << "\n# Current Block: " << *label_->block();
      FATAL("%s", str.str().c_str());
    }
#endif  // DEBUG
    Node* phi = state_->raw_assembler_->Phi(
        var.first->rep_, static_cast<int>(merge_count_), &(i->second[0]));
    variable_phis_[var_impl] = phi;
  }

  // Bind all variables to a merge phi, the common value along all paths or
  // null.
  for (auto var : state_->variables_) {
    auto i = variable_phis_.find(var);
    if (i != variable_phis_.end()) {
      var->value_ = i->second;
    } else {
      auto j = variable_merges_.find(var);
      if (j != variable_merges_.end() && j->second.size() == merge_count_) {
        var->value_ = j->second.back();
      } else {
        var->value_ = nullptr;
      }
    }
  }

  bound_ = true;
}

void CodeAssemblerParameterizedLabelBase::AddInputs(std::vector<Node*> inputs) {
  if (!phi_nodes_.empty()) {
    DCHECK_EQ(inputs.size(), phi_nodes_.size());
    for (size_t i = 0; i < inputs.size(); ++i) {
      // We use {nullptr} as a sentinel for an uninitialized value.
      if (phi_nodes_[i] == nullptr) continue;
      state_->raw_assembler_->AppendPhiInput(phi_nodes_[i], inputs[i]);
    }
  } else {
    DCHECK_EQ(inputs.size(), phi_inputs_.size());
    for (size_t i = 0; i < inputs.size(); ++i) {
      phi_inputs_[i].push_back(inputs[i]);
    }
  }
}

Node* CodeAssemblerParameterizedLabelBase::CreatePhi(
    MachineRepresentation rep, const std::vector<Node*>& inputs) {
  for (Node* input : inputs) {
    // We use {nullptr} as a sentinel for an uninitialized value. We must not
    // create phi nodes for these.
    if (input == nullptr) return nullptr;
  }
  return state_->raw_assembler_->Phi(rep, static_cast<int>(inputs.size()),
                                     &inputs.front());
}

const std::vector<Node*>& CodeAssemblerParameterizedLabelBase::CreatePhis(
    std::vector<MachineRepresentation> representations) {
  DCHECK(is_used());
  DCHECK(phi_nodes_.empty());
  phi_nodes_.reserve(phi_inputs_.size());
  DCHECK_EQ(representations.size(), phi_inputs_.size());
  for (size_t i = 0; i < phi_inputs_.size(); ++i) {
    phi_nodes_.push_back(CreatePhi(representations[i], phi_inputs_[i]));
  }
  return phi_nodes_;
}

void CodeAssemblerState::PushExceptionHandler(
    CodeAssemblerExceptionHandlerLabel* label) {
  exception_handler_labels_.push_back(label);
}

void CodeAssemblerState::PopExceptionHandler() {
  exception_handler_labels_.pop_back();
}

ScopedExceptionHandler::ScopedExceptionHandler(
    CodeAssembler* assembler, CodeAssemblerExceptionHandlerLabel* label)
    : has_handler_(label != nullptr),
      assembler_(assembler),
      compatibility_label_(nullptr),
      exception_(nullptr) {
  if (has_handler_) {
    assembler_->state()->PushExceptionHandler(label);
  }
}

ScopedExceptionHandler::ScopedExceptionHandler(
    CodeAssembler* assembler, CodeAssemblerLabel* label,
    TypedCodeAssemblerVariable<Object>* exception)
    : has_handler_(label != nullptr),
      assembler_(assembler),
      compatibility_label_(label),
      exception_(exception) {
  if (has_handler_) {
    label_ = std::make_unique<CodeAssemblerExceptionHandlerLabel>(
        assembler, CodeAssemblerLabel::kDeferred);
    assembler_->state()->PushExceptionHandler(label_.get());
  }
}

ScopedExceptionHandler::~ScopedExceptionHandler() {
  if (has_handler_) {
    assembler_->state()->PopExceptionHandler();
  }
  if (label_ && label_->is_used()) {
    CodeAssembler::Label skip(assembler_);
    bool inside_block = assembler_->state()->InsideBlock();
    if (inside_block) {
      assembler_->Goto(&skip);
    }
    TNode<Object> e;
    assembler_->Bind(label_.get(), &e);
    if (exception_ != nullptr) *exception_ = e;
    assembler_->Goto(compatibility_label_);
    if (inside_block) {
      assembler_->Bind(&skip);
    }
  }
}

}  // namespace compiler

}  // namespace internal
}  // namespace v8
