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code-stub-assembler.h
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// Copyright 2016 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.
#ifndef V8_CODE_STUB_ASSEMBLER_H_
#define V8_CODE_STUB_ASSEMBLER_H_
#include <functional>
#include "src/base/macros.h"
#include "src/compiler/code-assembler.h"
#include "src/globals.h"
#include "src/objects.h"
#include "src/objects/bigint.h"
#include "src/roots.h"
namespace v8 {
namespace internal {
class CallInterfaceDescriptor;
class CodeStubArguments;
class CodeStubAssembler;
class StatsCounter;
class StubCache;
enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
#define HEAP_MUTABLE_IMMOVABLE_OBJECT_LIST(V) \
V(ArraySpeciesProtector, array_species_protector, ArraySpeciesProtector) \
V(EmptyPropertyDictionary, empty_property_dictionary, \
EmptyPropertyDictionary) \
V(PromiseSpeciesProtector, promise_species_protector, \
PromiseSpeciesProtector) \
V(TypedArraySpeciesProtector, typed_array_species_protector, \
TypedArraySpeciesProtector) \
V(StoreHandler0Map, store_handler0_map, StoreHandler0Map)
#define HEAP_IMMUTABLE_IMMOVABLE_OBJECT_LIST(V) \
V(AccessorInfoMap, accessor_info_map, AccessorInfoMap) \
V(AccessorPairMap, accessor_pair_map, AccessorPairMap) \
V(AllocationSiteWithWeakNextMap, allocation_site_map, AllocationSiteMap) \
V(AllocationSiteWithoutWeakNextMap, allocation_site_without_weaknext_map, \
AllocationSiteWithoutWeakNextMap) \
V(BooleanMap, boolean_map, BooleanMap) \
V(CodeMap, code_map, CodeMap) \
V(EmptyFixedArray, empty_fixed_array, EmptyFixedArray) \
V(EmptySlowElementDictionary, empty_slow_element_dictionary, \
EmptySlowElementDictionary) \
V(empty_string, empty_string, EmptyString) \
V(FalseValue, false_value, False) \
V(FeedbackVectorMap, feedback_vector_map, FeedbackVectorMap) \
V(FixedArrayMap, fixed_array_map, FixedArrayMap) \
V(FixedCOWArrayMap, fixed_cow_array_map, FixedCOWArrayMap) \
V(FixedDoubleArrayMap, fixed_double_array_map, FixedDoubleArrayMap) \
V(FunctionTemplateInfoMap, function_template_info_map, \
FunctionTemplateInfoMap) \
V(GlobalPropertyCellMap, global_property_cell_map, PropertyCellMap) \
V(has_instance_symbol, has_instance_symbol, HasInstanceSymbol) \
V(HeapNumberMap, heap_number_map, HeapNumberMap) \
V(iterator_symbol, iterator_symbol, IteratorSymbol) \
V(length_string, length_string, LengthString) \
V(ManyClosuresCellMap, many_closures_cell_map, ManyClosuresCellMap) \
V(MetaMap, meta_map, MetaMap) \
V(MinusZeroValue, minus_zero_value, MinusZero) \
V(MutableHeapNumberMap, mutable_heap_number_map, MutableHeapNumberMap) \
V(NanValue, nan_value, Nan) \
V(NoClosuresCellMap, no_closures_cell_map, NoClosuresCellMap) \
V(NullValue, null_value, Null) \
V(OneClosureCellMap, one_closure_cell_map, OneClosureCellMap) \
V(PreParsedScopeDataMap, pre_parsed_scope_data_map, PreParsedScopeDataMap) \
V(prototype_string, prototype_string, PrototypeString) \
V(SharedFunctionInfoMap, shared_function_info_map, SharedFunctionInfoMap) \
V(SymbolMap, symbol_map, SymbolMap) \
V(TheHoleValue, the_hole_value, TheHole) \
V(TransitionArrayMap, transition_array_map, TransitionArrayMap) \
V(TrueValue, true_value, True) \
V(Tuple2Map, tuple2_map, Tuple2Map) \
V(Tuple3Map, tuple3_map, Tuple3Map) \
V(ArrayBoilerplateDescriptionMap, array_boilerplate_description_map, \
ArrayBoilerplateDescriptionMap) \
V(UncompiledDataWithoutPreParsedScopeMap, \
uncompiled_data_without_pre_parsed_scope_map, \
UncompiledDataWithoutPreParsedScopeMap) \
V(UncompiledDataWithPreParsedScopeMap, \
uncompiled_data_with_pre_parsed_scope_map, \
UncompiledDataWithPreParsedScopeMap) \
V(UndefinedValue, undefined_value, Undefined) \
V(WeakFixedArrayMap, weak_fixed_array_map, WeakFixedArrayMap)
#define HEAP_IMMOVABLE_OBJECT_LIST(V) \
HEAP_MUTABLE_IMMOVABLE_OBJECT_LIST(V) \
HEAP_IMMUTABLE_IMMOVABLE_OBJECT_LIST(V)
// Returned from IteratorBuiltinsAssembler::GetIterator(). Struct is declared
// here to simplify use in other generated builtins.
struct IteratorRecord {
public:
// iteratorRecord.[[Iterator]]
compiler::TNode<JSReceiver> object;
// iteratorRecord.[[NextMethod]]
compiler::TNode<Object> next;
};
#ifdef DEBUG
#define CSA_CHECK(csa, x) \
(csa)->Check( \
[&]() -> compiler::Node* { \
return implicit_cast<compiler::SloppyTNode<Word32T>>(x); \
}, \
#x, __FILE__, __LINE__)
#else
#define CSA_CHECK(csa, x) (csa)->FastCheck(x)
#endif
#ifdef DEBUG
// Add stringified versions to the given values, except the first. That is,
// transform
// x, a, b, c, d, e, f
// to
// a, "a", b, "b", c, "c", d, "d", e, "e", f, "f"
//
// __VA_ARGS__ is ignored to allow the caller to pass through too many
// parameters, and the first element is ignored to support having no extra
// values without empty __VA_ARGS__ (which cause all sorts of problems with
// extra commas).
#define CSA_ASSERT_STRINGIFY_EXTRA_VALUES_5(_, v1, v2, v3, v4, v5, ...) \
v1, #v1, v2, #v2, v3, #v3, v4, #v4, v5, #v5
// Stringify the given variable number of arguments. The arguments are trimmed
// to 5 if there are too many, and padded with nullptr if there are not enough.
#define CSA_ASSERT_STRINGIFY_EXTRA_VALUES(...) \
CSA_ASSERT_STRINGIFY_EXTRA_VALUES_5(__VA_ARGS__, nullptr, nullptr, nullptr, \
nullptr, nullptr)
#define CSA_ASSERT_GET_FIRST(x, ...) (x)
#define CSA_ASSERT_GET_FIRST_STR(x, ...) #x
// CSA_ASSERT(csa, <condition>, <extra values to print...>)
// We have to jump through some hoops to allow <extra values to print...> to be
// empty.
#define CSA_ASSERT(csa, ...) \
(csa)->Assert( \
[&]() -> compiler::Node* { \
return implicit_cast<compiler::SloppyTNode<Word32T>>( \
EXPAND(CSA_ASSERT_GET_FIRST(__VA_ARGS__))); \
}, \
EXPAND(CSA_ASSERT_GET_FIRST_STR(__VA_ARGS__)), __FILE__, __LINE__, \
CSA_ASSERT_STRINGIFY_EXTRA_VALUES(__VA_ARGS__))
// CSA_ASSERT_BRANCH(csa, [](Label* ok, Label* not_ok) {...},
// <extra values to print...>)
#define CSA_ASSERT_BRANCH(csa, ...) \
(csa)->Assert(EXPAND(CSA_ASSERT_GET_FIRST(__VA_ARGS__)), \
EXPAND(CSA_ASSERT_GET_FIRST_STR(__VA_ARGS__)), __FILE__, \
__LINE__, CSA_ASSERT_STRINGIFY_EXTRA_VALUES(__VA_ARGS__))
#define CSA_ASSERT_JS_ARGC_OP(csa, Op, op, expected) \
(csa)->Assert( \
[&]() -> compiler::Node* { \
compiler::Node* const argc = \
(csa)->Parameter(Descriptor::kJSActualArgumentsCount); \
return (csa)->Op(argc, (csa)->Int32Constant(expected)); \
}, \
"argc " #op " " #expected, __FILE__, __LINE__, \
SmiFromInt32((csa)->Parameter(Descriptor::kJSActualArgumentsCount)), \
"argc")
#define CSA_ASSERT_JS_ARGC_EQ(csa, expected) \
CSA_ASSERT_JS_ARGC_OP(csa, Word32Equal, ==, expected)
#define CSA_DEBUG_INFO(name) \
{ #name, __FILE__, __LINE__ }
#define BIND(label) Bind(label, CSA_DEBUG_INFO(label))
#define VARIABLE(name, ...) \
Variable name(this, CSA_DEBUG_INFO(name), __VA_ARGS__)
#define VARIABLE_CONSTRUCTOR(name, ...) \
name(this, CSA_DEBUG_INFO(name), __VA_ARGS__)
#define TYPED_VARIABLE_DEF(type, name, ...) \
TVariable<type> name(CSA_DEBUG_INFO(name), __VA_ARGS__)
#else // DEBUG
#define CSA_ASSERT(csa, ...) ((void)0)
#define CSA_ASSERT_BRANCH(csa, ...) ((void)0)
#define CSA_ASSERT_JS_ARGC_EQ(csa, expected) ((void)0)
#define BIND(label) Bind(label)
#define VARIABLE(name, ...) Variable name(this, __VA_ARGS__)
#define VARIABLE_CONSTRUCTOR(name, ...) name(this, __VA_ARGS__)
#define TYPED_VARIABLE_DEF(type, name, ...) TVariable<type> name(__VA_ARGS__)
#endif // DEBUG
#define TVARIABLE(...) EXPAND(TYPED_VARIABLE_DEF(__VA_ARGS__, this))
#ifdef ENABLE_SLOW_DCHECKS
#define CSA_SLOW_ASSERT(csa, ...) \
if (FLAG_enable_slow_asserts) { \
CSA_ASSERT(csa, __VA_ARGS__); \
}
#else
#define CSA_SLOW_ASSERT(csa, ...) ((void)0)
#endif
class int31_t {
public:
int31_t() : value_(0) {}
int31_t(int value) : value_(value) { // NOLINT(runtime/explicit)
DCHECK_EQ((value & 0x80000000) != 0, (value & 0x40000000) != 0);
}
int31_t& operator=(int value) {
DCHECK_EQ((value & 0x80000000) != 0, (value & 0x40000000) != 0);
value_ = value;
return *this;
}
int32_t value() const { return value_; }
operator int32_t() const { return value_; }
private:
int32_t value_;
};
// Provides JavaScript-specific "macro-assembler" functionality on top of the
// CodeAssembler. By factoring the JavaScript-isms out of the CodeAssembler,
// it's possible to add JavaScript-specific useful CodeAssembler "macros"
// without modifying files in the compiler directory (and requiring a review
// from a compiler directory OWNER).
class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
public:
using Node = compiler::Node;
template <class T>
using TNode = compiler::TNode<T>;
template <class T>
using SloppyTNode = compiler::SloppyTNode<T>;
template <typename T>
using LazyNode = std::function<TNode<T>()>;
CodeStubAssembler(compiler::CodeAssemblerState* state);
enum AllocationFlag : uint8_t {
kNone = 0,
kDoubleAlignment = 1,
kPretenured = 1 << 1,
kAllowLargeObjectAllocation = 1 << 2,
};
enum SlackTrackingMode { kWithSlackTracking, kNoSlackTracking };
typedef base::Flags<AllocationFlag> AllocationFlags;
enum ParameterMode { SMI_PARAMETERS, INTPTR_PARAMETERS };
// On 32-bit platforms, there is a slight performance advantage to doing all
// of the array offset/index arithmetic with SMIs, since it's possible
// to save a few tag/untag operations without paying an extra expense when
// calculating array offset (the smi math can be folded away) and there are
// fewer live ranges. Thus only convert indices to untagged value on 64-bit
// platforms.
ParameterMode OptimalParameterMode() const {
return Is64() ? INTPTR_PARAMETERS : SMI_PARAMETERS;
}
MachineRepresentation ParameterRepresentation(ParameterMode mode) const {
return mode == INTPTR_PARAMETERS ? MachineType::PointerRepresentation()
: MachineRepresentation::kTaggedSigned;
}
MachineRepresentation OptimalParameterRepresentation() const {
return ParameterRepresentation(OptimalParameterMode());
}
TNode<IntPtrT> ParameterToIntPtr(Node* value, ParameterMode mode) {
if (mode == SMI_PARAMETERS) value = SmiUntag(value);
return UncheckedCast<IntPtrT>(value);
}
Node* IntPtrToParameter(SloppyTNode<IntPtrT> value, ParameterMode mode) {
if (mode == SMI_PARAMETERS) return SmiTag(value);
return value;
}
Node* Int32ToParameter(SloppyTNode<Int32T> value, ParameterMode mode) {
return IntPtrToParameter(ChangeInt32ToIntPtr(value), mode);
}
TNode<Smi> ParameterToTagged(Node* value, ParameterMode mode) {
if (mode != SMI_PARAMETERS) return SmiTag(value);
return UncheckedCast<Smi>(value);
}
Node* TaggedToParameter(SloppyTNode<Smi> value, ParameterMode mode) {
if (mode != SMI_PARAMETERS) return SmiUntag(value);
return value;
}
TNode<Smi> TaggedToSmi(TNode<Object> value, Label* fail) {
GotoIf(TaggedIsNotSmi(value), fail);
return UncheckedCast<Smi>(value);
}
TNode<Number> TaggedToNumber(TNode<Object> value, Label* fail) {
GotoIfNot(IsNumber(value), fail);
return UncheckedCast<Number>(value);
}
TNode<HeapObject> TaggedToHeapObject(TNode<Object> value, Label* fail) {
GotoIf(TaggedIsSmi(value), fail);
return UncheckedCast<HeapObject>(value);
}
TNode<JSArray> HeapObjectToJSArray(TNode<HeapObject> heap_object,
Label* fail) {
GotoIfNot(IsJSArray(heap_object), fail);
return UncheckedCast<JSArray>(heap_object);
}
TNode<JSArray> TaggedToFastJSArray(TNode<Context> context,
TNode<Object> value, Label* fail) {
GotoIf(TaggedIsSmi(value), fail);
TNode<HeapObject> heap_object = CAST(value);
GotoIfNot(IsFastJSArray(heap_object, context), fail);
return UncheckedCast<JSArray>(heap_object);
}
TNode<JSDataView> HeapObjectToJSDataView(TNode<HeapObject> heap_object,
Label* fail) {
GotoIfNot(IsJSDataView(heap_object), fail);
return CAST(heap_object);
}
TNode<JSReceiver> HeapObjectToCallable(TNode<HeapObject> heap_object,
Label* fail) {
GotoIfNot(IsCallable(heap_object), fail);
return CAST(heap_object);
}
TNode<HeapNumber> UnsafeCastNumberToHeapNumber(TNode<Number> p_n) {
return CAST(p_n);
}
TNode<FixedArrayBase> UnsafeCastObjectToFixedArrayBase(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<FixedArray> UnsafeCastObjectToFixedArray(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<FixedDoubleArray> UnsafeCastObjectToFixedDoubleArray(
TNode<Object> p_o) {
return CAST(p_o);
}
TNode<HeapNumber> UnsafeCastObjectToHeapNumber(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<HeapObject> UnsafeCastObjectToCallable(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<Smi> UnsafeCastObjectToSmi(TNode<Object> p_o) { return CAST(p_o); }
TNode<Number> UnsafeCastObjectToNumber(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<HeapObject> UnsafeCastObjectToHeapObject(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<JSArray> UnsafeCastObjectToJSArray(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<FixedTypedArrayBase> UnsafeCastObjectToFixedTypedArrayBase(
TNode<Object> p_o) {
return CAST(p_o);
}
TNode<Object> UnsafeCastObjectToCompareBuiltinFn(TNode<Object> p_o) {
return p_o;
}
TNode<Object> UnsafeCastObjectToLoadFn(TNode<Object> p_o) { return p_o; }
TNode<Object> UnsafeCastObjectToStoreFn(TNode<Object> p_o) { return p_o; }
TNode<Object> UnsafeCastObjectToCanUseSameAccessorFn(TNode<Object> p_o) {
return p_o;
}
TNode<NumberDictionary> UnsafeCastObjectToNumberDictionary(
TNode<Object> p_o) {
return CAST(p_o);
}
TNode<JSReceiver> UnsafeCastObjectToJSReceiver(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<JSObject> UnsafeCastObjectToJSObject(TNode<Object> p_o) {
return CAST(p_o);
}
TNode<Map> UnsafeCastObjectToMap(TNode<Object> p_o) { return CAST(p_o); }
Node* MatchesParameterMode(Node* value, ParameterMode mode);
#define PARAMETER_BINOP(OpName, IntPtrOpName, SmiOpName) \
Node* OpName(Node* a, Node* b, ParameterMode mode) { \
if (mode == SMI_PARAMETERS) { \
return SmiOpName(CAST(a), CAST(b)); \
} else { \
DCHECK_EQ(INTPTR_PARAMETERS, mode); \
return IntPtrOpName(a, b); \
} \
}
PARAMETER_BINOP(IntPtrOrSmiMin, IntPtrMin, SmiMin)
PARAMETER_BINOP(IntPtrOrSmiAdd, IntPtrAdd, SmiAdd)
PARAMETER_BINOP(IntPtrOrSmiSub, IntPtrSub, SmiSub)
PARAMETER_BINOP(IntPtrOrSmiLessThan, IntPtrLessThan, SmiLessThan)
PARAMETER_BINOP(IntPtrOrSmiLessThanOrEqual, IntPtrLessThanOrEqual,
SmiLessThanOrEqual)
PARAMETER_BINOP(IntPtrOrSmiGreaterThan, IntPtrGreaterThan, SmiGreaterThan)
PARAMETER_BINOP(IntPtrOrSmiGreaterThanOrEqual, IntPtrGreaterThanOrEqual,
SmiGreaterThanOrEqual)
PARAMETER_BINOP(UintPtrOrSmiLessThan, UintPtrLessThan, SmiBelow)
PARAMETER_BINOP(UintPtrOrSmiGreaterThanOrEqual, UintPtrGreaterThanOrEqual,
SmiAboveOrEqual)
#undef PARAMETER_BINOP
TNode<Object> NoContextConstant();
#define HEAP_CONSTANT_ACCESSOR(rootIndexName, rootAccessorName, name) \
compiler::TNode<std::remove_reference<decltype( \
*std::declval<ReadOnlyRoots>().rootAccessorName())>::type> \
name##Constant();
HEAP_IMMUTABLE_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_ACCESSOR)
#undef HEAP_CONSTANT_ACCESSOR
#define HEAP_CONSTANT_ACCESSOR(rootIndexName, rootAccessorName, name) \
compiler::TNode<std::remove_reference<decltype( \
*std::declval<Heap>().rootAccessorName())>::type> \
name##Constant();
HEAP_MUTABLE_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_ACCESSOR)
#undef HEAP_CONSTANT_ACCESSOR
#define HEAP_CONSTANT_TEST(rootIndexName, rootAccessorName, name) \
TNode<BoolT> Is##name(SloppyTNode<Object> value); \
TNode<BoolT> IsNot##name(SloppyTNode<Object> value);
HEAP_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_TEST)
#undef HEAP_CONSTANT_TEST
Node* IntPtrOrSmiConstant(int value, ParameterMode mode);
TNode<Smi> LanguageModeConstant(LanguageMode mode) {
return SmiConstant(static_cast<int>(mode));
}
bool IsIntPtrOrSmiConstantZero(Node* test, ParameterMode mode);
bool TryGetIntPtrOrSmiConstantValue(Node* maybe_constant, int* value,
ParameterMode mode);
// Round the 32bits payload of the provided word up to the next power of two.
TNode<IntPtrT> IntPtrRoundUpToPowerOfTwo32(TNode<IntPtrT> value);
// Select the maximum of the two provided IntPtr values.
TNode<IntPtrT> IntPtrMax(SloppyTNode<IntPtrT> left,
SloppyTNode<IntPtrT> right);
// Select the minimum of the two provided IntPtr values.
TNode<IntPtrT> IntPtrMin(SloppyTNode<IntPtrT> left,
SloppyTNode<IntPtrT> right);
// Float64 operations.
TNode<Float64T> Float64Ceil(SloppyTNode<Float64T> x);
TNode<Float64T> Float64Floor(SloppyTNode<Float64T> x);
TNode<Float64T> Float64Round(SloppyTNode<Float64T> x);
TNode<Float64T> Float64RoundToEven(SloppyTNode<Float64T> x);
TNode<Float64T> Float64Trunc(SloppyTNode<Float64T> x);
// Select the minimum of the two provided Number values.
TNode<Object> NumberMax(SloppyTNode<Object> left, SloppyTNode<Object> right);
// Select the minimum of the two provided Number values.
TNode<Object> NumberMin(SloppyTNode<Object> left, SloppyTNode<Object> right);
// After converting an index to an integer, calculate a relative index: if
// index < 0, max(length + index, 0); else min(index, length)
TNode<IntPtrT> ConvertToRelativeIndex(TNode<Context> context,
TNode<Object> index,
TNode<IntPtrT> length);
// Returns true iff the given value fits into smi range and is >= 0.
TNode<BoolT> IsValidPositiveSmi(TNode<IntPtrT> value);
// Tag an IntPtr as a Smi value.
TNode<Smi> SmiTag(SloppyTNode<IntPtrT> value);
// Untag a Smi value as an IntPtr.
TNode<IntPtrT> SmiUntag(SloppyTNode<Smi> value);
// Smi conversions.
TNode<Float64T> SmiToFloat64(SloppyTNode<Smi> value);
TNode<Smi> SmiFromIntPtr(SloppyTNode<IntPtrT> value) { return SmiTag(value); }
TNode<Smi> SmiFromInt32(SloppyTNode<Int32T> value);
TNode<IntPtrT> SmiToIntPtr(SloppyTNode<Smi> value) { return SmiUntag(value); }
TNode<Int32T> SmiToInt32(SloppyTNode<Smi> value);
// Smi operations.
#define SMI_ARITHMETIC_BINOP(SmiOpName, IntPtrOpName, Int32OpName) \
TNode<Smi> SmiOpName(TNode<Smi> a, TNode<Smi> b) { \
if (SmiValuesAre32Bits()) { \
return BitcastWordToTaggedSigned( \
IntPtrOpName(BitcastTaggedToWord(a), BitcastTaggedToWord(b))); \
} else { \
DCHECK(SmiValuesAre31Bits()); \
if (kPointerSize == kInt64Size) { \
CSA_ASSERT(this, IsValidSmi(a)); \
CSA_ASSERT(this, IsValidSmi(b)); \
} \
return BitcastWordToTaggedSigned(ChangeInt32ToIntPtr( \
Int32OpName(TruncateIntPtrToInt32(BitcastTaggedToWord(a)), \
TruncateIntPtrToInt32(BitcastTaggedToWord(b))))); \
} \
}
SMI_ARITHMETIC_BINOP(SmiAdd, IntPtrAdd, Int32Add)
SMI_ARITHMETIC_BINOP(SmiSub, IntPtrSub, Int32Sub)
SMI_ARITHMETIC_BINOP(SmiAnd, WordAnd, Word32And)
SMI_ARITHMETIC_BINOP(SmiOr, WordOr, Word32Or)
#undef SMI_ARITHMETIC_BINOP
TNode<Smi> SmiInc(TNode<Smi> value) { return SmiAdd(value, SmiConstant(1)); }
TNode<Smi> TrySmiAdd(TNode<Smi> a, TNode<Smi> b, Label* if_overflow);
TNode<Smi> TrySmiSub(TNode<Smi> a, TNode<Smi> b, Label* if_overflow);
TNode<Smi> SmiShl(TNode<Smi> a, int shift) {
return BitcastWordToTaggedSigned(WordShl(BitcastTaggedToWord(a), shift));
}
TNode<Smi> SmiShr(TNode<Smi> a, int shift) {
return BitcastWordToTaggedSigned(
WordAnd(WordShr(BitcastTaggedToWord(a), shift),
BitcastTaggedToWord(SmiConstant(-1))));
}
Node* WordOrSmiShl(Node* a, int shift, ParameterMode mode) {
if (mode == SMI_PARAMETERS) {
return SmiShl(CAST(a), shift);
} else {
DCHECK_EQ(INTPTR_PARAMETERS, mode);
return WordShl(a, shift);
}
}
Node* WordOrSmiShr(Node* a, int shift, ParameterMode mode) {
if (mode == SMI_PARAMETERS) {
return SmiShr(CAST(a), shift);
} else {
DCHECK_EQ(INTPTR_PARAMETERS, mode);
return WordShr(a, shift);
}
}
#define SMI_COMPARISON_OP(SmiOpName, IntPtrOpName, Int32OpName) \
TNode<BoolT> SmiOpName(TNode<Smi> a, TNode<Smi> b) { \
if (SmiValuesAre32Bits()) { \
return IntPtrOpName(BitcastTaggedToWord(a), BitcastTaggedToWord(b)); \
} else { \
DCHECK(SmiValuesAre31Bits()); \
if (kPointerSize == kInt64Size) { \
CSA_ASSERT(this, IsValidSmi(a)); \
CSA_ASSERT(this, IsValidSmi(b)); \
} \
return Int32OpName(TruncateIntPtrToInt32(BitcastTaggedToWord(a)), \
TruncateIntPtrToInt32(BitcastTaggedToWord(b))); \
} \
}
SMI_COMPARISON_OP(SmiEqual, WordEqual, Word32Equal)
SMI_COMPARISON_OP(SmiNotEqual, WordNotEqual, Word32NotEqual)
SMI_COMPARISON_OP(SmiAbove, UintPtrGreaterThan, Uint32GreaterThan)
SMI_COMPARISON_OP(SmiAboveOrEqual, UintPtrGreaterThanOrEqual,
Uint32GreaterThanOrEqual)
SMI_COMPARISON_OP(SmiBelow, UintPtrLessThan, Uint32LessThan)
SMI_COMPARISON_OP(SmiLessThan, IntPtrLessThan, Int32LessThan)
SMI_COMPARISON_OP(SmiLessThanOrEqual, IntPtrLessThanOrEqual,
Int32LessThanOrEqual)
SMI_COMPARISON_OP(SmiGreaterThan, IntPtrGreaterThan, Int32GreaterThan)
SMI_COMPARISON_OP(SmiGreaterThanOrEqual, IntPtrGreaterThanOrEqual,
Int32GreaterThanOrEqual)
#undef SMI_COMPARISON_OP
TNode<Smi> SmiMax(TNode<Smi> a, TNode<Smi> b);
TNode<Smi> SmiMin(TNode<Smi> a, TNode<Smi> b);
// Computes a % b for Smi inputs a and b; result is not necessarily a Smi.
TNode<Number> SmiMod(TNode<Smi> a, TNode<Smi> b);
// Computes a * b for Smi inputs a and b; result is not necessarily a Smi.
TNode<Number> SmiMul(TNode<Smi> a, TNode<Smi> b);
// Tries to compute dividend / divisor for Smi inputs; branching to bailout
// if the division needs to be performed as a floating point operation.
TNode<Smi> TrySmiDiv(TNode<Smi> dividend, TNode<Smi> divisor, Label* bailout);
// Smi | HeapNumber operations.
TNode<Number> NumberInc(SloppyTNode<Number> value);
TNode<Number> NumberDec(SloppyTNode<Number> value);
TNode<Number> NumberAdd(SloppyTNode<Number> a, SloppyTNode<Number> b);
TNode<Number> NumberSub(SloppyTNode<Number> a, SloppyTNode<Number> b);
void GotoIfNotNumber(Node* value, Label* is_not_number);
void GotoIfNumber(Node* value, Label* is_number);
TNode<Number> SmiToNumber(TNode<Smi> v) { return v; }
TNode<Number> BitwiseOp(Node* left32, Node* right32, Operation bitwise_op);
// Allocate an object of the given size.
Node* AllocateInNewSpace(Node* size, AllocationFlags flags = kNone);
Node* AllocateInNewSpace(int size, AllocationFlags flags = kNone);
Node* Allocate(Node* size, AllocationFlags flags = kNone);
Node* Allocate(int size, AllocationFlags flags = kNone);
Node* InnerAllocate(Node* previous, int offset);
Node* InnerAllocate(Node* previous, Node* offset);
Node* IsRegularHeapObjectSize(Node* size);
typedef std::function<void(Label*, Label*)> BranchGenerator;
typedef std::function<Node*()> NodeGenerator;
void Assert(const BranchGenerator& branch, const char* message = nullptr,
const char* file = nullptr, int line = 0,
Node* extra_node1 = nullptr, const char* extra_node1_name = "",
Node* extra_node2 = nullptr, const char* extra_node2_name = "",
Node* extra_node3 = nullptr, const char* extra_node3_name = "",
Node* extra_node4 = nullptr, const char* extra_node4_name = "",
Node* extra_node5 = nullptr, const char* extra_node5_name = "");
void Assert(const NodeGenerator& condition_body,
const char* message = nullptr, const char* file = nullptr,
int line = 0, Node* extra_node1 = nullptr,
const char* extra_node1_name = "", Node* extra_node2 = nullptr,
const char* extra_node2_name = "", Node* extra_node3 = nullptr,
const char* extra_node3_name = "", Node* extra_node4 = nullptr,
const char* extra_node4_name = "", Node* extra_node5 = nullptr,
const char* extra_node5_name = "");
void Check(const BranchGenerator& branch, const char* message = nullptr,
const char* file = nullptr, int line = 0,
Node* extra_node1 = nullptr, const char* extra_node1_name = "",
Node* extra_node2 = nullptr, const char* extra_node2_name = "",
Node* extra_node3 = nullptr, const char* extra_node3_name = "",
Node* extra_node4 = nullptr, const char* extra_node4_name = "",
Node* extra_node5 = nullptr, const char* extra_node5_name = "");
void Check(const NodeGenerator& condition_body, const char* message = nullptr,
const char* file = nullptr, int line = 0,
Node* extra_node1 = nullptr, const char* extra_node1_name = "",
Node* extra_node2 = nullptr, const char* extra_node2_name = "",
Node* extra_node3 = nullptr, const char* extra_node3_name = "",
Node* extra_node4 = nullptr, const char* extra_node4_name = "",
Node* extra_node5 = nullptr, const char* extra_node5_name = "");
void FastCheck(TNode<BoolT> condition);
// The following Call wrappers call an object according to the semantics that
// one finds in the EcmaScript spec, operating on an Callable (e.g. a
// JSFunction or proxy) rather than a Code object.
template <class... TArgs>
TNode<Object> Call(TNode<Context> context, TNode<Object> callable,
TNode<JSReceiver> receiver, TArgs... args) {
return UncheckedCast<Object>(CallJS(
CodeFactory::Call(isolate(), ConvertReceiverMode::kNotNullOrUndefined),
context, callable, receiver, args...));
}
template <class... TArgs>
TNode<Object> Call(TNode<Context> context, TNode<Object> callable,
TNode<Object> receiver, TArgs... args) {
if (IsUndefinedConstant(receiver) || IsNullConstant(receiver)) {
return UncheckedCast<Object>(CallJS(
CodeFactory::Call(isolate(), ConvertReceiverMode::kNullOrUndefined),
context, callable, receiver, args...));
}
return UncheckedCast<Object>(CallJS(CodeFactory::Call(isolate()), context,
callable, receiver, args...));
}
template <class A, class F, class G>
TNode<A> Select(SloppyTNode<BoolT> condition, const F& true_body,
const G& false_body) {
return UncheckedCast<A>(SelectImpl(
condition,
[&]() -> Node* { return implicit_cast<TNode<A>>(true_body()); },
[&]() -> Node* { return implicit_cast<TNode<A>>(false_body()); },
MachineRepresentationOf<A>::value));
}
template <class A>
TNode<A> SelectConstant(TNode<BoolT> condition, TNode<A> true_value,
TNode<A> false_value) {
return Select<A>(condition, [=] { return true_value; },
[=] { return false_value; });
}
TNode<Int32T> SelectInt32Constant(SloppyTNode<BoolT> condition,
int true_value, int false_value);
TNode<IntPtrT> SelectIntPtrConstant(SloppyTNode<BoolT> condition,
int true_value, int false_value);
TNode<Oddball> SelectBooleanConstant(SloppyTNode<BoolT> condition);
TNode<Smi> SelectSmiConstant(SloppyTNode<BoolT> condition, Smi* true_value,
Smi* false_value);
TNode<Smi> SelectSmiConstant(SloppyTNode<BoolT> condition, int true_value,
Smi* false_value) {
return SelectSmiConstant(condition, Smi::FromInt(true_value), false_value);
}
TNode<Smi> SelectSmiConstant(SloppyTNode<BoolT> condition, Smi* true_value,
int false_value) {
return SelectSmiConstant(condition, true_value, Smi::FromInt(false_value));
}
TNode<Smi> SelectSmiConstant(SloppyTNode<BoolT> condition, int true_value,
int false_value) {
return SelectSmiConstant(condition, Smi::FromInt(true_value),
Smi::FromInt(false_value));
}
TNode<Int32T> TruncateIntPtrToInt32(SloppyTNode<IntPtrT> value);
// Check a value for smi-ness
TNode<BoolT> TaggedIsSmi(SloppyTNode<Object> a);
TNode<BoolT> TaggedIsSmi(TNode<MaybeObject> a);
TNode<BoolT> TaggedIsNotSmi(SloppyTNode<Object> a);
// Check that the value is a non-negative smi.
TNode<BoolT> TaggedIsPositiveSmi(SloppyTNode<Object> a);
// Check that a word has a word-aligned address.
TNode<BoolT> WordIsWordAligned(SloppyTNode<WordT> word);
TNode<BoolT> WordIsPowerOfTwo(SloppyTNode<IntPtrT> value);
#if DEBUG
void Bind(Label* label, AssemblerDebugInfo debug_info);
#else
void Bind(Label* label);
#endif // DEBUG
void BranchIfSmiEqual(TNode<Smi> a, TNode<Smi> b, Label* if_true,
Label* if_false) {
Branch(SmiEqual(a, b), if_true, if_false);
}
void BranchIfSmiLessThan(TNode<Smi> a, TNode<Smi> b, Label* if_true,
Label* if_false) {
Branch(SmiLessThan(a, b), if_true, if_false);
}
void BranchIfSmiLessThanOrEqual(TNode<Smi> a, TNode<Smi> b, Label* if_true,
Label* if_false) {
Branch(SmiLessThanOrEqual(a, b), if_true, if_false);
}
void BranchIfFloat64IsNaN(Node* value, Label* if_true, Label* if_false) {
Branch(Float64Equal(value, value), if_false, if_true);
}
// Branches to {if_true} if ToBoolean applied to {value} yields true,
// otherwise goes to {if_false}.
void BranchIfToBooleanIsTrue(Node* value, Label* if_true, Label* if_false);
void BranchIfJSReceiver(Node* object, Label* if_true, Label* if_false);
void BranchIfFastJSArray(Node* object, Node* context, Label* if_true,
Label* if_false, bool iteration_only = false);
void BranchIfNotFastJSArray(Node* object, Node* context, Label* if_true,
Label* if_false) {
BranchIfFastJSArray(object, context, if_false, if_true);
}
void BranchIfFastJSArrayForCopy(Node* object, Node* context, Label* if_true,
Label* if_false);
// Branches to {if_true} when --force-slow-path flag has been passed.
// It's used for testing to ensure that slow path implementation behave
// equivalent to corresponding fast paths (where applicable).
//
// Works only with V8_ENABLE_FORCE_SLOW_PATH compile time flag. Nop otherwise.
void GotoIfForceSlowPath(Label* if_true);
// Load value from current frame by given offset in bytes.
Node* LoadFromFrame(int offset, MachineType rep = MachineType::AnyTagged());
// Load value from current parent frame by given offset in bytes.
Node* LoadFromParentFrame(int offset,
MachineType rep = MachineType::AnyTagged());
// Load target function from the current JS frame.
// This is an alternative way of getting the target function in addition to
// Parameter(Descriptor::kJSTarget). The latter should be used near the
// beginning of builtin code while the target value is still in the register
// and the former should be used in slow paths in order to reduce register
// pressure on the fast path.
TNode<JSFunction> LoadTargetFromFrame();
// Load an object pointer from a buffer that isn't in the heap.
Node* LoadBufferObject(Node* buffer, int offset,
MachineType rep = MachineType::AnyTagged());
// Load a field from an object on the heap.
Node* LoadObjectField(SloppyTNode<HeapObject> object, int offset,
MachineType rep);
template <class T, typename std::enable_if<
std::is_convertible<TNode<T>, TNode<Object>>::value,
int>::type = 0>
TNode<T> LoadObjectField(TNode<HeapObject> object, int offset) {
return CAST(LoadObjectField(object, offset, MachineTypeOf<T>::value));
}
template <class T, typename std::enable_if<
std::is_convertible<TNode<T>, TNode<UntaggedT>>::value,
int>::type = 0>
TNode<T> LoadObjectField(TNode<HeapObject> object, int offset) {
return UncheckedCast<T>(
LoadObjectField(object, offset, MachineTypeOf<T>::value));
}
TNode<Object> LoadObjectField(SloppyTNode<HeapObject> object, int offset) {
return UncheckedCast<Object>(
LoadObjectField(object, offset, MachineType::AnyTagged()));
}
Node* LoadObjectField(SloppyTNode<HeapObject> object,
SloppyTNode<IntPtrT> offset, MachineType rep);
TNode<Object> LoadObjectField(SloppyTNode<HeapObject> object,
SloppyTNode<IntPtrT> offset) {
return UncheckedCast<Object>(
LoadObjectField(object, offset, MachineType::AnyTagged()));
}
// Load a SMI field and untag it.
TNode<IntPtrT> LoadAndUntagObjectField(SloppyTNode<HeapObject> object,
int offset);
// Load a SMI field, untag it, and convert to Word32.
TNode<Int32T> LoadAndUntagToWord32ObjectField(Node* object, int offset);
// Load a SMI and untag it.
TNode<IntPtrT> LoadAndUntagSmi(Node* base, int index);
// Load a SMI root, untag it, and convert to Word32.
TNode<Int32T> LoadAndUntagToWord32Root(Heap::RootListIndex root_index);
TNode<MaybeObject> LoadMaybeWeakObjectField(SloppyTNode<HeapObject> object,
int offset) {
return UncheckedCast<MaybeObject>(
LoadObjectField(object, offset, MachineType::AnyTagged()));
}
// Tag a smi and store it.
Node* StoreAndTagSmi(Node* base, int offset, Node* value);
// Load the floating point value of a HeapNumber.
TNode<Float64T> LoadHeapNumberValue(SloppyTNode<HeapNumber> object);
// Load the Map of an HeapObject.
TNode<Map> LoadMap(SloppyTNode<HeapObject> object);
// Load the instance type of an HeapObject.
TNode<Int32T> LoadInstanceType(SloppyTNode<HeapObject> object);
// Compare the instance the type of the object against the provided one.
TNode<BoolT> HasInstanceType(SloppyTNode<HeapObject> object,
InstanceType type);
TNode<BoolT> DoesntHaveInstanceType(SloppyTNode<HeapObject> object,
InstanceType type);
TNode<BoolT> TaggedDoesntHaveInstanceType(SloppyTNode<HeapObject> any_tagged,
InstanceType type);
// Load the properties backing store of a JSObject.
TNode<HeapObject> LoadSlowProperties(SloppyTNode<JSObject> object);
TNode<HeapObject> LoadFastProperties(SloppyTNode<JSObject> object);
// Load the elements backing store of a JSObject.
TNode<FixedArrayBase> LoadElements(SloppyTNode<JSObject> object);
// Load the length of a JSArray instance.
TNode<Number> LoadJSArrayLength(SloppyTNode<JSArray> array);
// Load the length of a fast JSArray instance. Returns a positive Smi.
TNode<Smi> LoadFastJSArrayLength(SloppyTNode<JSArray> array);
// Load the length of a fixed array base instance.
TNode<Smi> LoadFixedArrayBaseLength(SloppyTNode<FixedArrayBase> array);
// Load the length of a fixed array base instance.
TNode<IntPtrT> LoadAndUntagFixedArrayBaseLength(
SloppyTNode<FixedArrayBase> array);
// Load the length of a WeakFixedArray.
TNode<Smi> LoadWeakFixedArrayLength(TNode<WeakFixedArray> array);
TNode<IntPtrT> LoadAndUntagWeakFixedArrayLength(
SloppyTNode<WeakFixedArray> array);
// Load the length of a JSTypedArray instance.
TNode<Smi> LoadTypedArrayLength(TNode<JSTypedArray> typed_array);
// Load the bit field of a Map.
TNode<Int32T> LoadMapBitField(SloppyTNode<Map> map);
// Load bit field 2 of a map.
TNode<Int32T> LoadMapBitField2(SloppyTNode<Map> map);
// Load bit field 3 of a map.
TNode<Uint32T> LoadMapBitField3(SloppyTNode<Map> map);
// Load the instance type of a map.
TNode<Int32T> LoadMapInstanceType(SloppyTNode<Map> map);
// Load the ElementsKind of a map.
TNode<Int32T> LoadMapElementsKind(SloppyTNode<Map> map);
TNode<Int32T> LoadElementsKind(SloppyTNode<HeapObject> map);
// Load the instance descriptors of a map.
TNode<DescriptorArray> LoadMapDescriptors(SloppyTNode<Map> map);
// Load the prototype of a map.
TNode<HeapObject> LoadMapPrototype(SloppyTNode<Map> map);
// Load the prototype info of a map. The result has to be checked if it is a
// prototype info object or not.
TNode<PrototypeInfo> LoadMapPrototypeInfo(SloppyTNode<Map> map,
Label* if_has_no_proto_info);
// Load the instance size of a Map.
TNode<IntPtrT> LoadMapInstanceSizeInWords(SloppyTNode<Map> map);
// Load the inobject properties start of a Map (valid only for JSObjects).
TNode<IntPtrT> LoadMapInobjectPropertiesStartInWords(SloppyTNode<Map> map);
// Load the constructor function index of a Map (only for primitive maps).
TNode<IntPtrT> LoadMapConstructorFunctionIndex(SloppyTNode<Map> map);
// Load the constructor of a Map (equivalent to Map::GetConstructor()).
TNode<Object> LoadMapConstructor(SloppyTNode<Map> map);
// Load the EnumLength of a Map.
Node* LoadMapEnumLength(SloppyTNode<Map> map);
// Load the back-pointer of a Map.
TNode<Object> LoadMapBackPointer(SloppyTNode<Map> map);
// Load the identity hash of a JSRececiver.
TNode<IntPtrT> LoadJSReceiverIdentityHash(SloppyTNode<Object> receiver,
Label* if_no_hash = nullptr);
// This is only used on a newly allocated PropertyArray which
// doesn't have an existing hash.
void InitializePropertyArrayLength(Node* property_array, Node* length,
ParameterMode mode);
// Check if the map is set for slow properties.
TNode<BoolT> IsDictionaryMap(SloppyTNode<Map> map);
// Load the hash field of a name as an uint32 value.
TNode<Uint32T> LoadNameHashField(SloppyTNode<Name> name);
// Load the hash value of a name as an uint32 value.
// If {if_hash_not_computed} label is specified then it also checks if
// hash is actually computed.
TNode<Uint32T> LoadNameHash(SloppyTNode<Name> name,
Label* if_hash_not_computed = nullptr);
// Load length field of a String object as intptr_t value.
TNode<IntPtrT> LoadStringLengthAsWord(SloppyTNode<String> object);
// Load length field of a String object as Smi value.
TNode<Smi> LoadStringLengthAsSmi(SloppyTNode<String> object);
// Loads a pointer to the sequential String char array.
Node* PointerToSeqStringData(Node* seq_string);
// Load value field of a JSValue object.
Node* LoadJSValueValue(Node* object);
// Figures out whether the value of maybe_object is:
// - a SMI (jump to "if_smi", "extracted" will be the SMI value)
// - a cleared weak reference (jump to "if_cleared", "extracted" will be
// untouched)
// - a weak reference (jump to "if_weak", "extracted" will be the object
// pointed to)
// - a strong reference (jump to "if_strong", "extracted" will be the object
// pointed to)
void DispatchMaybeObject(TNode<MaybeObject> maybe_object, Label* if_smi,
Label* if_cleared, Label* if_weak, Label* if_strong,
TVariable<Object>* extracted);
// See MaybeObject for semantics of these functions.
TNode<BoolT> IsStrongHeapObject(TNode<MaybeObject> value);
// This variant is for overzealous checking.
TNode<BoolT> IsStrongHeapObject(TNode<Object> value) {
return IsStrongHeapObject(ReinterpretCast<MaybeObject>(value));
}
TNode<HeapObject> ToStrongHeapObject(TNode<MaybeObject> value,
Label* if_not_strong);
TNode<BoolT> IsWeakOrClearedHeapObject(TNode<MaybeObject> value);
TNode<BoolT> IsClearedWeakHeapObject(TNode<MaybeObject> value);
TNode<BoolT> IsNotClearedWeakHeapObject(TNode<MaybeObject> value);
// Removes the weak bit + asserts it was set.
TNode<HeapObject> ToWeakHeapObject(TNode<MaybeObject> value);
TNode<HeapObject> ToWeakHeapObject(TNode<MaybeObject> value,
Label* if_cleared);
TNode<BoolT> IsWeakReferenceTo(TNode<MaybeObject> object,
TNode<Object> value);
TNode<BoolT> IsNotWeakReferenceTo(TNode<MaybeObject> object,
TNode<Object> value);
TNode<BoolT> IsStrongReferenceTo(TNode<MaybeObject> object,
TNode<Object> value);
TNode<MaybeObject> MakeWeak(TNode<HeapObject> value);
void FixedArrayBoundsCheck(TNode<FixedArrayBase> array, Node* index,
int additional_offset = 0,
ParameterMode parameter_mode = INTPTR_PARAMETERS);
// Load an array element from a FixedArray / WeakFixedArray / PropertyArray.
TNode<MaybeObject> LoadArrayElement(
SloppyTNode<HeapObject> object, int array_header_size, Node* index,
int additional_offset = 0,
ParameterMode parameter_mode = INTPTR_PARAMETERS,
LoadSensitivity needs_poisoning = LoadSensitivity::kSafe);
// Load an array element from a FixedArray.
TNode<Object> LoadFixedArrayElement(
TNode<FixedArray> object, Node* index, int additional_offset = 0,
ParameterMode parameter_mode = INTPTR_PARAMETERS,
LoadSensitivity needs_poisoning = LoadSensitivity::kSafe);
TNode<Object> LoadFixedArrayElement(TNode<FixedArray> object,
TNode<IntPtrT> index,
LoadSensitivity needs_poisoning) {
return LoadFixedArrayElement(object, index, 0, INTPTR_PARAMETERS,
needs_poisoning);
}
TNode<Object> LoadFixedArrayElement(
TNode<FixedArray> object, TNode<IntPtrT> index, int additional_offset = 0,
LoadSensitivity needs_poisoning = LoadSensitivity::kSafe) {
return LoadFixedArrayElement(object, index, additional_offset,
INTPTR_PARAMETERS, needs_poisoning);
}
TNode<Object> LoadFixedArrayElement(
TNode<FixedArray> object, int index, int additional_offset = 0,
LoadSensitivity needs_poisoning = LoadSensitivity::kSafe) {
return LoadFixedArrayElement(object, IntPtrConstant(index),
additional_offset, INTPTR_PARAMETERS,
needs_poisoning);
}