mirrored from https://chromium.googlesource.com/v8/v8.git
/
code-stub-assembler.cc
13270 lines (11530 loc) · 496 KB
/
code-stub-assembler.cc
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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.
#include "src/codegen/code-stub-assembler.h"
#include "include/v8-internal.h"
#include "src/base/macros.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/tnode.h"
#include "src/common/globals.h"
#include "src/execution/frames-inl.h"
#include "src/execution/frames.h"
#include "src/execution/protectors.h"
#include "src/heap/heap-inl.h" // For MemoryChunk. TODO(jkummerow): Drop.
#include "src/heap/memory-chunk.h"
#include "src/logging/counters.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/cell.h"
#include "src/objects/descriptor-array.h"
#include "src/objects/function-kind.h"
#include "src/objects/heap-number.h"
#include "src/objects/js-generator.h"
#include "src/objects/oddball.h"
#include "src/objects/ordered-hash-table-inl.h"
#include "src/objects/property-cell.h"
#include "src/roots/roots.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
using compiler::Node;
CodeStubAssembler::CodeStubAssembler(compiler::CodeAssemblerState* state)
: compiler::CodeAssembler(state),
TorqueGeneratedExportedMacrosAssembler(state) {
if (DEBUG_BOOL && FLAG_csa_trap_on_node != nullptr) {
HandleBreakOnNode();
}
}
void CodeStubAssembler::HandleBreakOnNode() {
// FLAG_csa_trap_on_node should be in a form "STUB,NODE" where STUB is a
// string specifying the name of a stub and NODE is number specifying node id.
const char* name = state()->name();
size_t name_length = strlen(name);
if (strncmp(FLAG_csa_trap_on_node, name, name_length) != 0) {
// Different name.
return;
}
size_t option_length = strlen(FLAG_csa_trap_on_node);
if (option_length < name_length + 2 ||
FLAG_csa_trap_on_node[name_length] != ',') {
// Option is too short.
return;
}
const char* start = &FLAG_csa_trap_on_node[name_length + 1];
char* end;
int node_id = static_cast<int>(strtol(start, &end, 10));
if (start == end) {
// Bad node id.
return;
}
BreakOnNode(node_id);
}
void CodeStubAssembler::Assert(const BranchGenerator& branch,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
#if defined(DEBUG)
if (FLAG_debug_code) {
Check(branch, message, file, line, extra_nodes);
}
#endif
}
void CodeStubAssembler::Assert(const NodeGenerator<BoolT>& condition_body,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
#if defined(DEBUG)
if (FLAG_debug_code) {
Check(condition_body, message, file, line, extra_nodes);
}
#endif
}
void CodeStubAssembler::Assert(SloppyTNode<Word32T> condition_node,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
#if defined(DEBUG)
if (FLAG_debug_code) {
Check(condition_node, message, file, line, extra_nodes);
}
#endif
}
void CodeStubAssembler::Check(const BranchGenerator& branch,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
Label ok(this);
Label not_ok(this, Label::kDeferred);
if (message != nullptr && FLAG_code_comments) {
Comment("[ Assert: ", message);
} else {
Comment("[ Assert");
}
branch(&ok, ¬_ok);
BIND(¬_ok);
FailAssert(message, file, line, extra_nodes);
BIND(&ok);
Comment("] Assert");
}
void CodeStubAssembler::Check(const NodeGenerator<BoolT>& condition_body,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
BranchGenerator branch = [=](Label* ok, Label* not_ok) {
TNode<BoolT> condition = condition_body();
Branch(condition, ok, not_ok);
};
Check(branch, message, file, line, extra_nodes);
}
void CodeStubAssembler::Check(SloppyTNode<Word32T> condition_node,
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
BranchGenerator branch = [=](Label* ok, Label* not_ok) {
Branch(condition_node, ok, not_ok);
};
Check(branch, message, file, line, extra_nodes);
}
void CodeStubAssembler::IncrementCallCount(
TNode<FeedbackVector> feedback_vector, TNode<UintPtrT> slot_id) {
Comment("increment call count");
TNode<Smi> call_count =
CAST(LoadFeedbackVectorSlot(feedback_vector, slot_id, kTaggedSize));
// The lowest {FeedbackNexus::CallCountField::kShift} bits of the call
// count are used as flags. To increment the call count by 1 we hence
// have to increment by 1 << {FeedbackNexus::CallCountField::kShift}.
TNode<Smi> new_count = SmiAdd(
call_count, SmiConstant(1 << FeedbackNexus::CallCountField::kShift));
// Count is Smi, so we don't need a write barrier.
StoreFeedbackVectorSlot(feedback_vector, slot_id, new_count,
SKIP_WRITE_BARRIER, kTaggedSize);
}
void CodeStubAssembler::FastCheck(TNode<BoolT> condition) {
Label ok(this), not_ok(this, Label::kDeferred);
Branch(condition, &ok, ¬_ok);
BIND(¬_ok);
Unreachable();
BIND(&ok);
}
void CodeStubAssembler::FailAssert(
const char* message, const char* file, int line,
std::initializer_list<ExtraNode> extra_nodes) {
DCHECK_NOT_NULL(message);
EmbeddedVector<char, 1024> chars;
if (file != nullptr) {
SNPrintF(chars, "%s [%s:%d]", message, file, line);
message = chars.begin();
}
TNode<String> message_node = StringConstant(message);
#ifdef DEBUG
// Only print the extra nodes in debug builds.
for (auto& node : extra_nodes) {
CallRuntime(Runtime::kPrintWithNameForAssert, SmiConstant(0),
StringConstant(node.second), node.first);
}
#endif
AbortCSAAssert(message_node);
Unreachable();
}
TNode<Int32T> CodeStubAssembler::SelectInt32Constant(
SloppyTNode<BoolT> condition, int true_value, int false_value) {
return SelectConstant<Int32T>(condition, Int32Constant(true_value),
Int32Constant(false_value));
}
TNode<IntPtrT> CodeStubAssembler::SelectIntPtrConstant(
SloppyTNode<BoolT> condition, int true_value, int false_value) {
return SelectConstant<IntPtrT>(condition, IntPtrConstant(true_value),
IntPtrConstant(false_value));
}
TNode<Oddball> CodeStubAssembler::SelectBooleanConstant(
SloppyTNode<BoolT> condition) {
return SelectConstant<Oddball>(condition, TrueConstant(), FalseConstant());
}
TNode<Smi> CodeStubAssembler::SelectSmiConstant(SloppyTNode<BoolT> condition,
Smi true_value,
Smi false_value) {
return SelectConstant<Smi>(condition, SmiConstant(true_value),
SmiConstant(false_value));
}
TNode<Smi> CodeStubAssembler::NoContextConstant() {
return SmiConstant(Context::kNoContext);
}
#define HEAP_CONSTANT_ACCESSOR(rootIndexName, rootAccessorName, name) \
TNode<std::remove_pointer<std::remove_reference<decltype( \
std::declval<Heap>().rootAccessorName())>::type>::type> \
CodeStubAssembler::name##Constant() { \
return UncheckedCast<std::remove_pointer<std::remove_reference<decltype( \
std::declval<Heap>().rootAccessorName())>::type>::type>( \
LoadRoot(RootIndex::k##rootIndexName)); \
}
HEAP_MUTABLE_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_ACCESSOR)
#undef HEAP_CONSTANT_ACCESSOR
#define HEAP_CONSTANT_ACCESSOR(rootIndexName, rootAccessorName, name) \
TNode<std::remove_pointer<std::remove_reference<decltype( \
std::declval<ReadOnlyRoots>().rootAccessorName())>::type>::type> \
CodeStubAssembler::name##Constant() { \
return UncheckedCast<std::remove_pointer<std::remove_reference<decltype( \
std::declval<ReadOnlyRoots>().rootAccessorName())>::type>::type>( \
LoadRoot(RootIndex::k##rootIndexName)); \
}
HEAP_IMMUTABLE_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_ACCESSOR)
#undef HEAP_CONSTANT_ACCESSOR
#define HEAP_CONSTANT_TEST(rootIndexName, rootAccessorName, name) \
TNode<BoolT> CodeStubAssembler::Is##name(SloppyTNode<Object> value) { \
return TaggedEqual(value, name##Constant()); \
} \
TNode<BoolT> CodeStubAssembler::IsNot##name(SloppyTNode<Object> value) { \
return TaggedNotEqual(value, name##Constant()); \
}
HEAP_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_TEST)
#undef HEAP_CONSTANT_TEST
TNode<BInt> CodeStubAssembler::BIntConstant(int value) {
#if defined(BINT_IS_SMI)
return SmiConstant(value);
#elif defined(BINT_IS_INTPTR)
return IntPtrConstant(value);
#else
#error Unknown architecture.
#endif
}
template <>
TNode<Smi> CodeStubAssembler::IntPtrOrSmiConstant<Smi>(int value) {
return SmiConstant(value);
}
template <>
TNode<IntPtrT> CodeStubAssembler::IntPtrOrSmiConstant<IntPtrT>(int value) {
return IntPtrConstant(value);
}
template <>
TNode<UintPtrT> CodeStubAssembler::IntPtrOrSmiConstant<UintPtrT>(int value) {
return Unsigned(IntPtrConstant(value));
}
template <>
TNode<RawPtrT> CodeStubAssembler::IntPtrOrSmiConstant<RawPtrT>(int value) {
return ReinterpretCast<RawPtrT>(IntPtrConstant(value));
}
Node* CodeStubAssembler::IntPtrOrSmiConstant(int value, ParameterMode mode) {
if (mode == SMI_PARAMETERS) {
return SmiConstant(value);
} else {
DCHECK_EQ(INTPTR_PARAMETERS, mode);
return IntPtrConstant(value);
}
}
bool CodeStubAssembler::TryGetIntPtrOrSmiConstantValue(Node* maybe_constant,
int* value,
ParameterMode mode) {
int32_t int32_constant;
if (mode == INTPTR_PARAMETERS) {
if (ToInt32Constant(maybe_constant, &int32_constant)) {
*value = int32_constant;
return true;
}
} else {
DCHECK_EQ(mode, SMI_PARAMETERS);
Smi smi_constant;
if (ToSmiConstant(maybe_constant, &smi_constant)) {
*value = Smi::ToInt(smi_constant);
return true;
}
}
return false;
}
TNode<IntPtrT> CodeStubAssembler::IntPtrRoundUpToPowerOfTwo32(
TNode<IntPtrT> value) {
Comment("IntPtrRoundUpToPowerOfTwo32");
CSA_ASSERT(this, UintPtrLessThanOrEqual(value, IntPtrConstant(0x80000000u)));
value = Signed(IntPtrSub(value, IntPtrConstant(1)));
for (int i = 1; i <= 16; i *= 2) {
value = Signed(WordOr(value, WordShr(value, IntPtrConstant(i))));
}
return Signed(IntPtrAdd(value, IntPtrConstant(1)));
}
Node* CodeStubAssembler::MatchesParameterMode(Node* value, ParameterMode mode) {
if (mode == SMI_PARAMETERS) {
return TaggedIsSmi(value);
} else {
return Int32Constant(1);
}
}
TNode<BoolT> CodeStubAssembler::WordIsPowerOfTwo(SloppyTNode<IntPtrT> value) {
intptr_t constant;
if (ToIntPtrConstant(value, &constant)) {
return BoolConstant(base::bits::IsPowerOfTwo(constant));
}
// value && !(value & (value - 1))
return IntPtrEqual(
Select<IntPtrT>(
IntPtrEqual(value, IntPtrConstant(0)),
[=] { return IntPtrConstant(1); },
[=] { return WordAnd(value, IntPtrSub(value, IntPtrConstant(1))); }),
IntPtrConstant(0));
}
TNode<Float64T> CodeStubAssembler::Float64Round(SloppyTNode<Float64T> x) {
TNode<Float64T> one = Float64Constant(1.0);
TNode<Float64T> one_half = Float64Constant(0.5);
Label return_x(this);
// Round up {x} towards Infinity.
TVARIABLE(Float64T, var_x, Float64Ceil(x));
GotoIf(Float64LessThanOrEqual(Float64Sub(var_x.value(), one_half), x),
&return_x);
var_x = Float64Sub(var_x.value(), one);
Goto(&return_x);
BIND(&return_x);
return TNode<Float64T>::UncheckedCast(var_x.value());
}
TNode<Float64T> CodeStubAssembler::Float64Ceil(SloppyTNode<Float64T> x) {
if (IsFloat64RoundUpSupported()) {
return Float64RoundUp(x);
}
TNode<Float64T> one = Float64Constant(1.0);
TNode<Float64T> zero = Float64Constant(0.0);
TNode<Float64T> two_52 = Float64Constant(4503599627370496.0E0);
TNode<Float64T> minus_two_52 = Float64Constant(-4503599627370496.0E0);
TVARIABLE(Float64T, var_x, x);
Label return_x(this), return_minus_x(this);
// Check if {x} is greater than zero.
Label if_xgreaterthanzero(this), if_xnotgreaterthanzero(this);
Branch(Float64GreaterThan(x, zero), &if_xgreaterthanzero,
&if_xnotgreaterthanzero);
BIND(&if_xgreaterthanzero);
{
// Just return {x} unless it's in the range ]0,2^52[.
GotoIf(Float64GreaterThanOrEqual(x, two_52), &return_x);
// Round positive {x} towards Infinity.
var_x = Float64Sub(Float64Add(two_52, x), two_52);
GotoIfNot(Float64LessThan(var_x.value(), x), &return_x);
var_x = Float64Add(var_x.value(), one);
Goto(&return_x);
}
BIND(&if_xnotgreaterthanzero);
{
// Just return {x} unless it's in the range ]-2^52,0[
GotoIf(Float64LessThanOrEqual(x, minus_two_52), &return_x);
GotoIfNot(Float64LessThan(x, zero), &return_x);
// Round negated {x} towards Infinity and return the result negated.
TNode<Float64T> minus_x = Float64Neg(x);
var_x = Float64Sub(Float64Add(two_52, minus_x), two_52);
GotoIfNot(Float64GreaterThan(var_x.value(), minus_x), &return_minus_x);
var_x = Float64Sub(var_x.value(), one);
Goto(&return_minus_x);
}
BIND(&return_minus_x);
var_x = Float64Neg(var_x.value());
Goto(&return_x);
BIND(&return_x);
return TNode<Float64T>::UncheckedCast(var_x.value());
}
TNode<Float64T> CodeStubAssembler::Float64Floor(SloppyTNode<Float64T> x) {
if (IsFloat64RoundDownSupported()) {
return Float64RoundDown(x);
}
TNode<Float64T> one = Float64Constant(1.0);
TNode<Float64T> zero = Float64Constant(0.0);
TNode<Float64T> two_52 = Float64Constant(4503599627370496.0E0);
TNode<Float64T> minus_two_52 = Float64Constant(-4503599627370496.0E0);
TVARIABLE(Float64T, var_x, x);
Label return_x(this), return_minus_x(this);
// Check if {x} is greater than zero.
Label if_xgreaterthanzero(this), if_xnotgreaterthanzero(this);
Branch(Float64GreaterThan(x, zero), &if_xgreaterthanzero,
&if_xnotgreaterthanzero);
BIND(&if_xgreaterthanzero);
{
// Just return {x} unless it's in the range ]0,2^52[.
GotoIf(Float64GreaterThanOrEqual(x, two_52), &return_x);
// Round positive {x} towards -Infinity.
var_x = Float64Sub(Float64Add(two_52, x), two_52);
GotoIfNot(Float64GreaterThan(var_x.value(), x), &return_x);
var_x = Float64Sub(var_x.value(), one);
Goto(&return_x);
}
BIND(&if_xnotgreaterthanzero);
{
// Just return {x} unless it's in the range ]-2^52,0[
GotoIf(Float64LessThanOrEqual(x, minus_two_52), &return_x);
GotoIfNot(Float64LessThan(x, zero), &return_x);
// Round negated {x} towards -Infinity and return the result negated.
TNode<Float64T> minus_x = Float64Neg(x);
var_x = Float64Sub(Float64Add(two_52, minus_x), two_52);
GotoIfNot(Float64LessThan(var_x.value(), minus_x), &return_minus_x);
var_x = Float64Add(var_x.value(), one);
Goto(&return_minus_x);
}
BIND(&return_minus_x);
var_x = Float64Neg(var_x.value());
Goto(&return_x);
BIND(&return_x);
return TNode<Float64T>::UncheckedCast(var_x.value());
}
TNode<Float64T> CodeStubAssembler::Float64RoundToEven(SloppyTNode<Float64T> x) {
if (IsFloat64RoundTiesEvenSupported()) {
return Float64RoundTiesEven(x);
}
// See ES#sec-touint8clamp for details.
TNode<Float64T> f = Float64Floor(x);
TNode<Float64T> f_and_half = Float64Add(f, Float64Constant(0.5));
TVARIABLE(Float64T, var_result);
Label return_f(this), return_f_plus_one(this), done(this);
GotoIf(Float64LessThan(f_and_half, x), &return_f_plus_one);
GotoIf(Float64LessThan(x, f_and_half), &return_f);
{
TNode<Float64T> f_mod_2 = Float64Mod(f, Float64Constant(2.0));
Branch(Float64Equal(f_mod_2, Float64Constant(0.0)), &return_f,
&return_f_plus_one);
}
BIND(&return_f);
var_result = f;
Goto(&done);
BIND(&return_f_plus_one);
var_result = Float64Add(f, Float64Constant(1.0));
Goto(&done);
BIND(&done);
return TNode<Float64T>::UncheckedCast(var_result.value());
}
TNode<Float64T> CodeStubAssembler::Float64Trunc(SloppyTNode<Float64T> x) {
if (IsFloat64RoundTruncateSupported()) {
return Float64RoundTruncate(x);
}
TNode<Float64T> one = Float64Constant(1.0);
TNode<Float64T> zero = Float64Constant(0.0);
TNode<Float64T> two_52 = Float64Constant(4503599627370496.0E0);
TNode<Float64T> minus_two_52 = Float64Constant(-4503599627370496.0E0);
TVARIABLE(Float64T, var_x, x);
Label return_x(this), return_minus_x(this);
// Check if {x} is greater than 0.
Label if_xgreaterthanzero(this), if_xnotgreaterthanzero(this);
Branch(Float64GreaterThan(x, zero), &if_xgreaterthanzero,
&if_xnotgreaterthanzero);
BIND(&if_xgreaterthanzero);
{
if (IsFloat64RoundDownSupported()) {
var_x = Float64RoundDown(x);
} else {
// Just return {x} unless it's in the range ]0,2^52[.
GotoIf(Float64GreaterThanOrEqual(x, two_52), &return_x);
// Round positive {x} towards -Infinity.
var_x = Float64Sub(Float64Add(two_52, x), two_52);
GotoIfNot(Float64GreaterThan(var_x.value(), x), &return_x);
var_x = Float64Sub(var_x.value(), one);
}
Goto(&return_x);
}
BIND(&if_xnotgreaterthanzero);
{
if (IsFloat64RoundUpSupported()) {
var_x = Float64RoundUp(x);
Goto(&return_x);
} else {
// Just return {x} unless its in the range ]-2^52,0[.
GotoIf(Float64LessThanOrEqual(x, minus_two_52), &return_x);
GotoIfNot(Float64LessThan(x, zero), &return_x);
// Round negated {x} towards -Infinity and return result negated.
TNode<Float64T> minus_x = Float64Neg(x);
var_x = Float64Sub(Float64Add(two_52, minus_x), two_52);
GotoIfNot(Float64GreaterThan(var_x.value(), minus_x), &return_minus_x);
var_x = Float64Sub(var_x.value(), one);
Goto(&return_minus_x);
}
}
BIND(&return_minus_x);
var_x = Float64Neg(var_x.value());
Goto(&return_x);
BIND(&return_x);
return TNode<Float64T>::UncheckedCast(var_x.value());
}
TNode<BoolT> CodeStubAssembler::IsValidSmi(TNode<Smi> smi) {
if (SmiValuesAre32Bits() && kSystemPointerSize == kInt64Size) {
// Check that the Smi value is zero in the lower bits.
TNode<IntPtrT> value = BitcastTaggedToWordForTagAndSmiBits(smi);
return Word32Equal(Int32Constant(0), TruncateIntPtrToInt32(value));
}
return Int32TrueConstant();
}
TNode<BoolT> CodeStubAssembler::IsValidSmiIndex(TNode<Smi> smi) {
if (COMPRESS_POINTERS_BOOL) {
return WordEqual(
BitcastTaggedToWordForTagAndSmiBits(smi),
BitcastTaggedToWordForTagAndSmiBits(NormalizeSmiIndex(smi)));
}
return Int32TrueConstant();
}
template <>
TNode<Smi> CodeStubAssembler::TaggedToParameter(TNode<Smi> value) {
return value;
}
template <>
TNode<IntPtrT> CodeStubAssembler::TaggedToParameter(TNode<Smi> value) {
return SmiUntag(value);
}
TNode<IntPtrT> CodeStubAssembler::TaggedIndexToIntPtr(
TNode<TaggedIndex> value) {
return Signed(WordSarShiftOutZeros(BitcastTaggedToWordForTagAndSmiBits(value),
IntPtrConstant(kSmiTagSize)));
}
TNode<TaggedIndex> CodeStubAssembler::IntPtrToTaggedIndex(
TNode<IntPtrT> value) {
return ReinterpretCast<TaggedIndex>(
BitcastWordToTaggedSigned(WordShl(value, IntPtrConstant(kSmiTagSize))));
}
TNode<Smi> CodeStubAssembler::TaggedIndexToSmi(TNode<TaggedIndex> value) {
if (SmiValuesAre32Bits()) {
DCHECK_EQ(kSmiShiftSize, 31);
return BitcastWordToTaggedSigned(
WordShl(BitcastTaggedToWordForTagAndSmiBits(value),
IntPtrConstant(kSmiShiftSize)));
}
DCHECK(SmiValuesAre31Bits());
DCHECK_EQ(kSmiShiftSize, 0);
return ReinterpretCast<Smi>(value);
}
TNode<TaggedIndex> CodeStubAssembler::SmiToTaggedIndex(TNode<Smi> value) {
if (kSystemPointerSize == kInt32Size) {
return ReinterpretCast<TaggedIndex>(value);
}
if (SmiValuesAre32Bits()) {
DCHECK_EQ(kSmiShiftSize, 31);
return ReinterpretCast<TaggedIndex>(BitcastWordToTaggedSigned(
WordSar(BitcastTaggedToWordForTagAndSmiBits(value),
IntPtrConstant(kSmiShiftSize))));
}
DCHECK(SmiValuesAre31Bits());
DCHECK_EQ(kSmiShiftSize, 0);
// Just sign-extend the lower 32 bits.
TNode<Int32T> raw =
TruncateWordToInt32(BitcastTaggedToWordForTagAndSmiBits(value));
return ReinterpretCast<TaggedIndex>(
BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(raw)));
}
TNode<Smi> CodeStubAssembler::NormalizeSmiIndex(TNode<Smi> smi_index) {
if (COMPRESS_POINTERS_BOOL) {
TNode<Int32T> raw =
TruncateWordToInt32(BitcastTaggedToWordForTagAndSmiBits(smi_index));
smi_index = BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(raw));
}
return smi_index;
}
TNode<Smi> CodeStubAssembler::SmiFromInt32(SloppyTNode<Int32T> value) {
if (COMPRESS_POINTERS_BOOL) {
static_assert(!COMPRESS_POINTERS_BOOL || (kSmiShiftSize + kSmiTagSize == 1),
"Use shifting instead of add");
return BitcastWordToTaggedSigned(
ChangeUint32ToWord(Int32Add(value, value)));
}
return SmiTag(ChangeInt32ToIntPtr(value));
}
TNode<Smi> CodeStubAssembler::SmiFromUint32(TNode<Uint32T> value) {
CSA_ASSERT(this, IntPtrLessThan(ChangeUint32ToWord(value),
IntPtrConstant(Smi::kMaxValue)));
return SmiFromInt32(Signed(value));
}
TNode<BoolT> CodeStubAssembler::IsValidPositiveSmi(TNode<IntPtrT> value) {
intptr_t constant_value;
if (ToIntPtrConstant(value, &constant_value)) {
return (static_cast<uintptr_t>(constant_value) <=
static_cast<uintptr_t>(Smi::kMaxValue))
? Int32TrueConstant()
: Int32FalseConstant();
}
return UintPtrLessThanOrEqual(value, IntPtrConstant(Smi::kMaxValue));
}
TNode<Smi> CodeStubAssembler::SmiTag(SloppyTNode<IntPtrT> value) {
int32_t constant_value;
if (ToInt32Constant(value, &constant_value) && Smi::IsValid(constant_value)) {
return SmiConstant(constant_value);
}
if (COMPRESS_POINTERS_BOOL) {
return SmiFromInt32(TruncateIntPtrToInt32(value));
}
TNode<Smi> smi =
BitcastWordToTaggedSigned(WordShl(value, SmiShiftBitsConstant()));
return smi;
}
TNode<IntPtrT> CodeStubAssembler::SmiUntag(SloppyTNode<Smi> value) {
intptr_t constant_value;
if (ToIntPtrConstant(value, &constant_value)) {
return IntPtrConstant(constant_value >> (kSmiShiftSize + kSmiTagSize));
}
TNode<IntPtrT> raw_bits = BitcastTaggedToWordForTagAndSmiBits(value);
if (COMPRESS_POINTERS_BOOL) {
// Clear the upper half using sign-extension.
raw_bits = ChangeInt32ToIntPtr(TruncateIntPtrToInt32(raw_bits));
}
return Signed(WordSarShiftOutZeros(raw_bits, SmiShiftBitsConstant()));
}
TNode<Int32T> CodeStubAssembler::SmiToInt32(SloppyTNode<Smi> value) {
if (COMPRESS_POINTERS_BOOL) {
return Signed(Word32SarShiftOutZeros(
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(value)),
SmiShiftBitsConstant32()));
}
TNode<IntPtrT> result = SmiUntag(value);
return TruncateIntPtrToInt32(result);
}
TNode<Float64T> CodeStubAssembler::SmiToFloat64(SloppyTNode<Smi> value) {
return ChangeInt32ToFloat64(SmiToInt32(value));
}
TNode<Smi> CodeStubAssembler::SmiMax(TNode<Smi> a, TNode<Smi> b) {
return SelectConstant<Smi>(SmiLessThan(a, b), b, a);
}
TNode<Smi> CodeStubAssembler::SmiMin(TNode<Smi> a, TNode<Smi> b) {
return SelectConstant<Smi>(SmiLessThan(a, b), a, b);
}
TNode<IntPtrT> CodeStubAssembler::TryIntPtrAdd(TNode<IntPtrT> a,
TNode<IntPtrT> b,
Label* if_overflow) {
TNode<PairT<IntPtrT, BoolT>> pair = IntPtrAddWithOverflow(a, b);
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
return Projection<0>(pair);
}
TNode<IntPtrT> CodeStubAssembler::TryIntPtrSub(TNode<IntPtrT> a,
TNode<IntPtrT> b,
Label* if_overflow) {
TNode<PairT<IntPtrT, BoolT>> pair = IntPtrSubWithOverflow(a, b);
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
return Projection<0>(pair);
}
TNode<Int32T> CodeStubAssembler::TryInt32Mul(TNode<Int32T> a, TNode<Int32T> b,
Label* if_overflow) {
TNode<PairT<Int32T, BoolT>> pair = Int32MulWithOverflow(a, b);
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
return Projection<0>(pair);
}
TNode<Smi> CodeStubAssembler::TrySmiAdd(TNode<Smi> lhs, TNode<Smi> rhs,
Label* if_overflow) {
if (SmiValuesAre32Bits()) {
return BitcastWordToTaggedSigned(
TryIntPtrAdd(BitcastTaggedToWordForTagAndSmiBits(lhs),
BitcastTaggedToWordForTagAndSmiBits(rhs), if_overflow));
} else {
DCHECK(SmiValuesAre31Bits());
TNode<PairT<Int32T, BoolT>> pair = Int32AddWithOverflow(
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(lhs)),
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(rhs)));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<Int32T> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(result));
}
}
TNode<Smi> CodeStubAssembler::TrySmiSub(TNode<Smi> lhs, TNode<Smi> rhs,
Label* if_overflow) {
if (SmiValuesAre32Bits()) {
TNode<PairT<IntPtrT, BoolT>> pair =
IntPtrSubWithOverflow(BitcastTaggedToWordForTagAndSmiBits(lhs),
BitcastTaggedToWordForTagAndSmiBits(rhs));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<IntPtrT> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(result);
} else {
DCHECK(SmiValuesAre31Bits());
TNode<PairT<Int32T, BoolT>> pair = Int32SubWithOverflow(
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(lhs)),
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(rhs)));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<Int32T> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(result));
}
}
TNode<Smi> CodeStubAssembler::TrySmiAbs(TNode<Smi> a, Label* if_overflow) {
if (SmiValuesAre32Bits()) {
TNode<PairT<IntPtrT, BoolT>> pair =
IntPtrAbsWithOverflow(BitcastTaggedToWordForTagAndSmiBits(a));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<IntPtrT> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(result);
} else {
CHECK(SmiValuesAre31Bits());
CHECK(IsInt32AbsWithOverflowSupported());
TNode<PairT<Int32T, BoolT>> pair = Int32AbsWithOverflow(
TruncateIntPtrToInt32(BitcastTaggedToWordForTagAndSmiBits(a)));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<Int32T> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(result));
}
}
TNode<Number> CodeStubAssembler::NumberMax(SloppyTNode<Number> a,
SloppyTNode<Number> b) {
// TODO(danno): This could be optimized by specifically handling smi cases.
TVARIABLE(Number, result);
Label done(this), greater_than_equal_a(this), greater_than_equal_b(this);
GotoIfNumberGreaterThanOrEqual(a, b, &greater_than_equal_a);
GotoIfNumberGreaterThanOrEqual(b, a, &greater_than_equal_b);
result = NanConstant();
Goto(&done);
BIND(&greater_than_equal_a);
result = a;
Goto(&done);
BIND(&greater_than_equal_b);
result = b;
Goto(&done);
BIND(&done);
return result.value();
}
TNode<Number> CodeStubAssembler::NumberMin(SloppyTNode<Number> a,
SloppyTNode<Number> b) {
// TODO(danno): This could be optimized by specifically handling smi cases.
TVARIABLE(Number, result);
Label done(this), greater_than_equal_a(this), greater_than_equal_b(this);
GotoIfNumberGreaterThanOrEqual(a, b, &greater_than_equal_a);
GotoIfNumberGreaterThanOrEqual(b, a, &greater_than_equal_b);
result = NanConstant();
Goto(&done);
BIND(&greater_than_equal_a);
result = b;
Goto(&done);
BIND(&greater_than_equal_b);
result = a;
Goto(&done);
BIND(&done);
return result.value();
}
TNode<Number> CodeStubAssembler::SmiMod(TNode<Smi> a, TNode<Smi> b) {
TVARIABLE(Number, var_result);
Label return_result(this, &var_result),
return_minuszero(this, Label::kDeferred),
return_nan(this, Label::kDeferred);
// Untag {a} and {b}.
TNode<Int32T> int_a = SmiToInt32(a);
TNode<Int32T> int_b = SmiToInt32(b);
// Return NaN if {b} is zero.
GotoIf(Word32Equal(int_b, Int32Constant(0)), &return_nan);
// Check if {a} is non-negative.
Label if_aisnotnegative(this), if_aisnegative(this, Label::kDeferred);
Branch(Int32LessThanOrEqual(Int32Constant(0), int_a), &if_aisnotnegative,
&if_aisnegative);
BIND(&if_aisnotnegative);
{
// Fast case, don't need to check any other edge cases.
TNode<Int32T> r = Int32Mod(int_a, int_b);
var_result = SmiFromInt32(r);
Goto(&return_result);
}
BIND(&if_aisnegative);
{
if (SmiValuesAre32Bits()) {
// Check if {a} is kMinInt and {b} is -1 (only relevant if the
// kMinInt is actually representable as a Smi).
Label join(this);
GotoIfNot(Word32Equal(int_a, Int32Constant(kMinInt)), &join);
GotoIf(Word32Equal(int_b, Int32Constant(-1)), &return_minuszero);
Goto(&join);
BIND(&join);
}
// Perform the integer modulus operation.
TNode<Int32T> r = Int32Mod(int_a, int_b);
// Check if {r} is zero, and if so return -0, because we have to
// take the sign of the left hand side {a}, which is negative.
GotoIf(Word32Equal(r, Int32Constant(0)), &return_minuszero);
// The remainder {r} can be outside the valid Smi range on 32bit
// architectures, so we cannot just say SmiFromInt32(r) here.
var_result = ChangeInt32ToTagged(r);
Goto(&return_result);
}
BIND(&return_minuszero);
var_result = MinusZeroConstant();
Goto(&return_result);
BIND(&return_nan);
var_result = NanConstant();
Goto(&return_result);
BIND(&return_result);
return var_result.value();
}
TNode<Number> CodeStubAssembler::SmiMul(TNode<Smi> a, TNode<Smi> b) {
TVARIABLE(Number, var_result);
TVARIABLE(Float64T, var_lhs_float64);
TVARIABLE(Float64T, var_rhs_float64);
Label return_result(this, &var_result);
// Both {a} and {b} are Smis. Convert them to integers and multiply.
TNode<Int32T> lhs32 = SmiToInt32(a);
TNode<Int32T> rhs32 = SmiToInt32(b);
auto pair = Int32MulWithOverflow(lhs32, rhs32);
TNode<BoolT> overflow = Projection<1>(pair);
// Check if the multiplication overflowed.
Label if_overflow(this, Label::kDeferred), if_notoverflow(this);
Branch(overflow, &if_overflow, &if_notoverflow);
BIND(&if_notoverflow);
{
// If the answer is zero, we may need to return -0.0, depending on the
// input.
Label answer_zero(this), answer_not_zero(this);
TNode<Int32T> answer = Projection<0>(pair);
TNode<Int32T> zero = Int32Constant(0);
Branch(Word32Equal(answer, zero), &answer_zero, &answer_not_zero);
BIND(&answer_not_zero);
{
var_result = ChangeInt32ToTagged(answer);
Goto(&return_result);
}
BIND(&answer_zero);
{
TNode<Int32T> or_result = Word32Or(lhs32, rhs32);
Label if_should_be_negative_zero(this), if_should_be_zero(this);
Branch(Int32LessThan(or_result, zero), &if_should_be_negative_zero,
&if_should_be_zero);
BIND(&if_should_be_negative_zero);
{
var_result = MinusZeroConstant();
Goto(&return_result);
}
BIND(&if_should_be_zero);
{
var_result = SmiConstant(0);
Goto(&return_result);
}
}
}
BIND(&if_overflow);
{
var_lhs_float64 = SmiToFloat64(a);
var_rhs_float64 = SmiToFloat64(b);
TNode<Float64T> value =
Float64Mul(var_lhs_float64.value(), var_rhs_float64.value());
var_result = AllocateHeapNumberWithValue(value);
Goto(&return_result);
}
BIND(&return_result);
return var_result.value();
}
TNode<Smi> CodeStubAssembler::TrySmiDiv(TNode<Smi> dividend, TNode<Smi> divisor,
Label* bailout) {
// Both {a} and {b} are Smis. Bailout to floating point division if {divisor}
// is zero.
GotoIf(TaggedEqual(divisor, SmiConstant(0)), bailout);
// Do floating point division if {dividend} is zero and {divisor} is
// negative.
Label dividend_is_zero(this), dividend_is_not_zero(this);
Branch(TaggedEqual(dividend, SmiConstant(0)), ÷nd_is_zero,
÷nd_is_not_zero);
BIND(÷nd_is_zero);
{
GotoIf(SmiLessThan(divisor, SmiConstant(0)), bailout);
Goto(÷nd_is_not_zero);
}
BIND(÷nd_is_not_zero);
TNode<Int32T> untagged_divisor = SmiToInt32(divisor);
TNode<Int32T> untagged_dividend = SmiToInt32(dividend);
// Do floating point division if {dividend} is kMinInt (or kMinInt - 1
// if the Smi size is 31) and {divisor} is -1.
Label divisor_is_minus_one(this), divisor_is_not_minus_one(this);
Branch(Word32Equal(untagged_divisor, Int32Constant(-1)),
&divisor_is_minus_one, &divisor_is_not_minus_one);
BIND(&divisor_is_minus_one);
{
GotoIf(Word32Equal(
untagged_dividend,
Int32Constant(kSmiValueSize == 32 ? kMinInt : (kMinInt >> 1))),
bailout);
Goto(&divisor_is_not_minus_one);
}
BIND(&divisor_is_not_minus_one);
TNode<Int32T> untagged_result = Int32Div(untagged_dividend, untagged_divisor);
TNode<Int32T> truncated = Int32Mul(untagged_result, untagged_divisor);
// Do floating point division if the remainder is not 0.
GotoIf(Word32NotEqual(untagged_dividend, truncated), bailout);
return SmiFromInt32(untagged_result);
}