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code-stub-assembler.cc
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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/code-stub-assembler.h"
#include "src/code-factory.h"
#include "src/frames-inl.h"
#include "src/frames.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/descriptor-array.h"
#include "src/objects/ordered-hash-table-inl.h"
namespace v8 {
namespace internal {
using compiler::Node;
template <class T>
using TNode = compiler::TNode<T>;
template <class T>
using SloppyTNode = compiler::SloppyTNode<T>;
CodeStubAssembler::CodeStubAssembler(compiler::CodeAssemblerState* state)
: compiler::CodeAssembler(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,
Node* extra_node1, const char* extra_node1_name,
Node* extra_node2, const char* extra_node2_name,
Node* extra_node3, const char* extra_node3_name,
Node* extra_node4, const char* extra_node4_name,
Node* extra_node5,
const char* extra_node5_name) {
#if defined(DEBUG)
if (FLAG_debug_code) {
Check(branch, message, file, line, extra_node1, extra_node1_name,
extra_node2, extra_node2_name, extra_node3, extra_node3_name,
extra_node4, extra_node4_name, extra_node5, extra_node5_name);
}
#endif
}
void CodeStubAssembler::Assert(const NodeGenerator& condition_body,
const char* message, const char* file, int line,
Node* extra_node1, const char* extra_node1_name,
Node* extra_node2, const char* extra_node2_name,
Node* extra_node3, const char* extra_node3_name,
Node* extra_node4, const char* extra_node4_name,
Node* extra_node5,
const char* extra_node5_name) {
#if defined(DEBUG)
if (FLAG_debug_code) {
Check(condition_body, message, file, line, extra_node1, extra_node1_name,
extra_node2, extra_node2_name, extra_node3, extra_node3_name,
extra_node4, extra_node4_name, extra_node5, extra_node5_name);
}
#endif
}
#ifdef DEBUG
namespace {
void MaybePrintNodeWithName(CodeStubAssembler* csa, Node* node,
const char* node_name) {
if (node != nullptr) {
csa->CallRuntime(Runtime::kPrintWithNameForAssert, csa->SmiConstant(0),
csa->StringConstant(node_name), node);
}
}
} // namespace
#endif
void CodeStubAssembler::Check(const BranchGenerator& branch,
const char* message, const char* file, int line,
Node* extra_node1, const char* extra_node1_name,
Node* extra_node2, const char* extra_node2_name,
Node* extra_node3, const char* extra_node3_name,
Node* extra_node4, const char* extra_node4_name,
Node* extra_node5, const char* extra_node5_name) {
Label ok(this);
Label not_ok(this, Label::kDeferred);
if (message != nullptr && FLAG_code_comments) {
Comment("[ Assert: %s", message);
} else {
Comment("[ Assert");
}
branch(&ok, ¬_ok);
BIND(¬_ok);
DCHECK_NOT_NULL(message);
char chars[1024];
Vector<char> buffer(chars);
if (file != nullptr) {
SNPrintF(buffer, "CSA_ASSERT failed: %s [%s:%d]\n", message, file, line);
} else {
SNPrintF(buffer, "CSA_ASSERT failed: %s\n", message);
}
Node* message_node = StringConstant(&(buffer[0]));
#ifdef DEBUG
// Only print the extra nodes in debug builds.
MaybePrintNodeWithName(this, extra_node1, extra_node1_name);
MaybePrintNodeWithName(this, extra_node2, extra_node2_name);
MaybePrintNodeWithName(this, extra_node3, extra_node3_name);
MaybePrintNodeWithName(this, extra_node4, extra_node4_name);
MaybePrintNodeWithName(this, extra_node5, extra_node5_name);
#endif
DebugAbort(message_node);
Unreachable();
BIND(&ok);
Comment("] Assert");
}
void CodeStubAssembler::Check(const NodeGenerator& condition_body,
const char* message, const char* file, int line,
Node* extra_node1, const char* extra_node1_name,
Node* extra_node2, const char* extra_node2_name,
Node* extra_node3, const char* extra_node3_name,
Node* extra_node4, const char* extra_node4_name,
Node* extra_node5, const char* extra_node5_name) {
BranchGenerator branch = [=](Label* ok, Label* not_ok) {
Node* condition = condition_body();
DCHECK_NOT_NULL(condition);
Branch(condition, ok, not_ok);
};
Check(branch, message, file, line, extra_node1, extra_node1_name, extra_node2,
extra_node2_name, extra_node3, extra_node3_name, extra_node4,
extra_node4_name, extra_node5, extra_node5_name);
}
Node* CodeStubAssembler::SelectImpl(TNode<BoolT> condition,
const NodeGenerator& true_body,
const NodeGenerator& false_body,
MachineRepresentation rep) {
VARIABLE(value, rep);
Label vtrue(this), vfalse(this), end(this);
Branch(condition, &vtrue, &vfalse);
BIND(&vtrue);
{
value.Bind(true_body());
Goto(&end);
}
BIND(&vfalse);
{
value.Bind(false_body());
Goto(&end);
}
BIND(&end);
return value.value();
}
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<Object> CodeStubAssembler::NoContextConstant() {
return SmiConstant(Context::kNoContext);
}
#define HEAP_CONSTANT_ACCESSOR(rootIndexName, rootAccessorName, name) \
compiler::TNode<std::remove_reference<decltype( \
*std::declval<Heap>().rootAccessorName())>::type> \
CodeStubAssembler::name##Constant() { \
return UncheckedCast<std::remove_reference<decltype( \
*std::declval<Heap>().rootAccessorName())>::type>( \
LoadRoot(Heap::k##rootIndexName##RootIndex)); \
}
HEAP_MUTABLE_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<ReadOnlyRoots>().rootAccessorName())>::type> \
CodeStubAssembler::name##Constant() { \
return UncheckedCast<std::remove_reference<decltype( \
*std::declval<ReadOnlyRoots>().rootAccessorName())>::type>( \
LoadRoot(Heap::k##rootIndexName##RootIndex)); \
}
HEAP_IMMUTABLE_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_ACCESSOR);
#undef HEAP_CONSTANT_ACCESSOR
#define HEAP_CONSTANT_TEST(rootIndexName, rootAccessorName, name) \
compiler::TNode<BoolT> CodeStubAssembler::Is##name( \
SloppyTNode<Object> value) { \
return WordEqual(value, name##Constant()); \
} \
compiler::TNode<BoolT> CodeStubAssembler::IsNot##name( \
SloppyTNode<Object> value) { \
return WordNotEqual(value, name##Constant()); \
}
HEAP_IMMOVABLE_OBJECT_LIST(HEAP_CONSTANT_TEST);
#undef HEAP_CONSTANT_TEST
TNode<Int64T> CodeStubAssembler::HashSeed() {
DCHECK(Is64());
TNode<HeapObject> hash_seed_root =
TNode<HeapObject>::UncheckedCast(LoadRoot(Heap::kHashSeedRootIndex));
return TNode<Int64T>::UncheckedCast(LoadObjectField(
hash_seed_root, ByteArray::kHeaderSize, MachineType::Int64()));
}
TNode<Int32T> CodeStubAssembler::HashSeedHigh() {
DCHECK(!Is64());
#ifdef V8_TARGET_BIG_ENDIAN
static int kOffset = 0;
#else
static int kOffset = kInt32Size;
#endif
TNode<HeapObject> hash_seed_root =
TNode<HeapObject>::UncheckedCast(LoadRoot(Heap::kHashSeedRootIndex));
return TNode<Int32T>::UncheckedCast(LoadObjectField(
hash_seed_root, ByteArray::kHeaderSize + kOffset, MachineType::Int32()));
}
TNode<Int32T> CodeStubAssembler::HashSeedLow() {
DCHECK(!Is64());
#ifdef V8_TARGET_BIG_ENDIAN
static int kOffset = kInt32Size;
#else
static int kOffset = 0;
#endif
TNode<HeapObject> hash_seed_root =
TNode<HeapObject>::UncheckedCast(LoadRoot(Heap::kHashSeedRootIndex));
return TNode<Int32T>::UncheckedCast(LoadObjectField(
hash_seed_root, ByteArray::kHeaderSize + kOffset, MachineType::Int32()));
}
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::IsIntPtrOrSmiConstantZero(Node* test,
ParameterMode mode) {
int32_t constant_test;
Smi* smi_test;
if (mode == INTPTR_PARAMETERS) {
if (ToInt32Constant(test, constant_test) && constant_test == 0) {
return true;
}
} else {
DCHECK_EQ(mode, SMI_PARAMETERS);
if (ToSmiConstant(test, smi_test) && smi_test->value() == 0) {
return true;
}
}
return false;
}
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) {
// value && !(value & (value - 1))
return WordEqual(
Select<IntPtrT>(
WordEqual(value, IntPtrConstant(0)),
[=] { return IntPtrConstant(1); },
[=] { return WordAnd(value, IntPtrSub(value, IntPtrConstant(1))); }),
IntPtrConstant(0));
}
TNode<Float64T> CodeStubAssembler::Float64Round(SloppyTNode<Float64T> x) {
Node* one = Float64Constant(1.0);
Node* one_half = Float64Constant(0.5);
Label return_x(this);
// Round up {x} towards Infinity.
VARIABLE(var_x, MachineRepresentation::kFloat64, Float64Ceil(x));
GotoIf(Float64LessThanOrEqual(Float64Sub(var_x.value(), one_half), x),
&return_x);
var_x.Bind(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);
}
Node* one = Float64Constant(1.0);
Node* zero = Float64Constant(0.0);
Node* two_52 = Float64Constant(4503599627370496.0E0);
Node* minus_two_52 = Float64Constant(-4503599627370496.0E0);
VARIABLE(var_x, MachineRepresentation::kFloat64, 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.Bind(Float64Sub(Float64Add(two_52, x), two_52));
GotoIfNot(Float64LessThan(var_x.value(), x), &return_x);
var_x.Bind(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.
Node* minus_x = Float64Neg(x);
var_x.Bind(Float64Sub(Float64Add(two_52, minus_x), two_52));
GotoIfNot(Float64GreaterThan(var_x.value(), minus_x), &return_minus_x);
var_x.Bind(Float64Sub(var_x.value(), one));
Goto(&return_minus_x);
}
BIND(&return_minus_x);
var_x.Bind(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);
}
Node* one = Float64Constant(1.0);
Node* zero = Float64Constant(0.0);
Node* two_52 = Float64Constant(4503599627370496.0E0);
Node* minus_two_52 = Float64Constant(-4503599627370496.0E0);
VARIABLE(var_x, MachineRepresentation::kFloat64, 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.Bind(Float64Sub(Float64Add(two_52, x), two_52));
GotoIfNot(Float64GreaterThan(var_x.value(), x), &return_x);
var_x.Bind(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.
Node* minus_x = Float64Neg(x);
var_x.Bind(Float64Sub(Float64Add(two_52, minus_x), two_52));
GotoIfNot(Float64LessThan(var_x.value(), minus_x), &return_minus_x);
var_x.Bind(Float64Add(var_x.value(), one));
Goto(&return_minus_x);
}
BIND(&return_minus_x);
var_x.Bind(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.
Node* f = Float64Floor(x);
Node* f_and_half = Float64Add(f, Float64Constant(0.5));
VARIABLE(var_result, MachineRepresentation::kFloat64);
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);
{
Node* 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.Bind(f);
Goto(&done);
BIND(&return_f_plus_one);
var_result.Bind(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);
}
Node* one = Float64Constant(1.0);
Node* zero = Float64Constant(0.0);
Node* two_52 = Float64Constant(4503599627370496.0E0);
Node* minus_two_52 = Float64Constant(-4503599627370496.0E0);
VARIABLE(var_x, MachineRepresentation::kFloat64, 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.Bind(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.Bind(Float64Sub(Float64Add(two_52, x), two_52));
GotoIfNot(Float64GreaterThan(var_x.value(), x), &return_x);
var_x.Bind(Float64Sub(var_x.value(), one));
}
Goto(&return_x);
}
BIND(&if_xnotgreaterthanzero);
{
if (IsFloat64RoundUpSupported()) {
var_x.Bind(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.
Node* minus_x = Float64Neg(x);
var_x.Bind(Float64Sub(Float64Add(two_52, minus_x), two_52));
GotoIfNot(Float64GreaterThan(var_x.value(), minus_x), &return_minus_x);
var_x.Bind(Float64Sub(var_x.value(), one));
Goto(&return_minus_x);
}
}
BIND(&return_minus_x);
var_x.Bind(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 (SmiValuesAre31Bits() && kPointerSize == kInt64Size) {
// Check that the Smi value is properly sign-extended.
TNode<IntPtrT> value = Signed(BitcastTaggedToWord(smi));
return WordEqual(value, ChangeInt32ToIntPtr(TruncateIntPtrToInt32(value)));
}
return Int32TrueConstant();
}
Node* CodeStubAssembler::SmiShiftBitsConstant() {
return IntPtrConstant(kSmiShiftSize + kSmiTagSize);
}
TNode<Smi> CodeStubAssembler::SmiFromInt32(SloppyTNode<Int32T> value) {
TNode<IntPtrT> value_intptr = ChangeInt32ToIntPtr(value);
TNode<Smi> smi =
BitcastWordToTaggedSigned(WordShl(value_intptr, SmiShiftBitsConstant()));
#if V8_COMPRESS_POINTERS
CSA_ASSERT(this, IsValidSmi(smi));
#endif
return smi;
}
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);
}
TNode<Smi> smi =
BitcastWordToTaggedSigned(WordShl(value, SmiShiftBitsConstant()));
#if V8_COMPRESS_POINTERS
CSA_ASSERT(this, IsValidSmi(smi));
#endif
return smi;
}
TNode<IntPtrT> CodeStubAssembler::SmiUntag(SloppyTNode<Smi> value) {
#if V8_COMPRESS_POINTERS
CSA_ASSERT(this, IsValidSmi(value));
#endif
intptr_t constant_value;
if (ToIntPtrConstant(value, constant_value)) {
return IntPtrConstant(constant_value >> (kSmiShiftSize + kSmiTagSize));
}
return Signed(WordSar(BitcastTaggedToWord(value), SmiShiftBitsConstant()));
}
TNode<Int32T> CodeStubAssembler::SmiToInt32(SloppyTNode<Smi> value) {
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<Smi> CodeStubAssembler::TrySmiAdd(TNode<Smi> lhs, TNode<Smi> rhs,
Label* if_overflow) {
if (SmiValuesAre32Bits()) {
TNode<PairT<IntPtrT, BoolT>> pair = IntPtrAddWithOverflow(
BitcastTaggedToWord(lhs), BitcastTaggedToWord(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 =
Int32AddWithOverflow(TruncateIntPtrToInt32(BitcastTaggedToWord(lhs)),
TruncateIntPtrToInt32(BitcastTaggedToWord(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(
BitcastTaggedToWord(lhs), BitcastTaggedToWord(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(BitcastTaggedToWord(lhs)),
TruncateIntPtrToInt32(BitcastTaggedToWord(rhs)));
TNode<BoolT> overflow = Projection<1>(pair);
GotoIf(overflow, if_overflow);
TNode<Int32T> result = Projection<0>(pair);
return BitcastWordToTaggedSigned(ChangeInt32ToIntPtr(result));
}
}
TNode<Object> CodeStubAssembler::NumberMax(SloppyTNode<Object> a,
SloppyTNode<Object> b) {
// TODO(danno): This could be optimized by specifically handling smi cases.
VARIABLE(result, MachineRepresentation::kTagged);
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.Bind(NanConstant());
Goto(&done);
BIND(&greater_than_equal_a);
result.Bind(a);
Goto(&done);
BIND(&greater_than_equal_b);
result.Bind(b);
Goto(&done);
BIND(&done);
return TNode<Object>::UncheckedCast(result.value());
}
TNode<Object> CodeStubAssembler::NumberMin(SloppyTNode<Object> a,
SloppyTNode<Object> b) {
// TODO(danno): This could be optimized by specifically handling smi cases.
VARIABLE(result, MachineRepresentation::kTagged);
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.Bind(NanConstant());
Goto(&done);
BIND(&greater_than_equal_a);
result.Bind(b);
Goto(&done);
BIND(&greater_than_equal_b);
result.Bind(a);
Goto(&done);
BIND(&done);
return TNode<Object>::UncheckedCast(result.value());
}
TNode<IntPtrT> CodeStubAssembler::ConvertToRelativeIndex(
TNode<Context> context, TNode<Object> index, TNode<IntPtrT> length) {
TVARIABLE(IntPtrT, result);
TNode<Number> const index_int =
ToInteger_Inline(context, index, CodeStubAssembler::kTruncateMinusZero);
TNode<IntPtrT> zero = IntPtrConstant(0);
Label done(this);
Label if_issmi(this), if_isheapnumber(this, Label::kDeferred);
Branch(TaggedIsSmi(index_int), &if_issmi, &if_isheapnumber);
BIND(&if_issmi);
{
TNode<Smi> const index_smi = CAST(index_int);
result = Select<IntPtrT>(
IntPtrLessThan(SmiUntag(index_smi), zero),
[=] { return IntPtrMax(IntPtrAdd(length, SmiUntag(index_smi)), zero); },
[=] { return IntPtrMin(SmiUntag(index_smi), length); });
Goto(&done);
}
BIND(&if_isheapnumber);
{
// If {index} is a heap number, it is definitely out of bounds. If it is
// negative, {index} = max({length} + {index}),0) = 0'. If it is positive,
// set {index} to {length}.
TNode<HeapNumber> const index_hn = CAST(index_int);
TNode<Float64T> const float_zero = Float64Constant(0.);
TNode<Float64T> const index_float = LoadHeapNumberValue(index_hn);
result = SelectConstant<IntPtrT>(Float64LessThan(index_float, float_zero),
zero, length);
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);
VARIABLE(var_lhs_float64, MachineRepresentation::kFloat64);
VARIABLE(var_rhs_float64, MachineRepresentation::kFloat64);
Label return_result(this, &var_result);
// Both {a} and {b} are Smis. Convert them to integers and multiply.
Node* lhs32 = SmiToInt32(a);
Node* rhs32 = SmiToInt32(b);
Node* pair = Int32MulWithOverflow(lhs32, rhs32);
Node* 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);
Node* answer = Projection(0, pair);
Node* 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);
{
Node* 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.Bind(SmiToFloat64(a));
var_rhs_float64.Bind(SmiToFloat64(b));
Node* 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(WordEqual(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(WordEqual(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 = Signed(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);
}
TNode<Int32T> CodeStubAssembler::TruncateIntPtrToInt32(
SloppyTNode<IntPtrT> value) {
if (Is64()) {
return TruncateInt64ToInt32(ReinterpretCast<Int64T>(value));
}
return ReinterpretCast<Int32T>(value);
}
TNode<BoolT> CodeStubAssembler::TaggedIsSmi(SloppyTNode<Object> a) {
return WordEqual(WordAnd(BitcastTaggedToWord(a), IntPtrConstant(kSmiTagMask)),
IntPtrConstant(0));
}
TNode<BoolT> CodeStubAssembler::TaggedIsSmi(TNode<MaybeObject> a) {
return WordEqual(
WordAnd(BitcastMaybeObjectToWord(a), IntPtrConstant(kSmiTagMask)),
IntPtrConstant(0));
}
TNode<BoolT> CodeStubAssembler::TaggedIsNotSmi(SloppyTNode<Object> a) {
return WordNotEqual(
WordAnd(BitcastTaggedToWord(a), IntPtrConstant(kSmiTagMask)),
IntPtrConstant(0));
}
TNode<BoolT> CodeStubAssembler::TaggedIsPositiveSmi(SloppyTNode<Object> a) {
return WordEqual(WordAnd(BitcastTaggedToWord(a),
IntPtrConstant(kSmiTagMask | kSmiSignMask)),
IntPtrConstant(0));
}
TNode<BoolT> CodeStubAssembler::WordIsWordAligned(SloppyTNode<WordT> word) {
return WordEqual(IntPtrConstant(0),
WordAnd(word, IntPtrConstant(kPointerSize - 1)));
}
#if DEBUG
void CodeStubAssembler::Bind(Label* label, AssemblerDebugInfo debug_info) {
CodeAssembler::Bind(label, debug_info);
}
#else
void CodeStubAssembler::Bind(Label* label) { CodeAssembler::Bind(label); }
#endif // DEBUG
TNode<Float64T> CodeStubAssembler::LoadDoubleWithHoleCheck(
TNode<FixedDoubleArray> array, TNode<Smi> index, Label* if_hole) {
return LoadFixedDoubleArrayElement(array, index, MachineType::Float64(), 0,
SMI_PARAMETERS, if_hole);
}
void CodeStubAssembler::BranchIfPrototypesHaveNoElements(
Node* receiver_map, Label* definitely_no_elements,
Label* possibly_elements) {
CSA_SLOW_ASSERT(this, IsMap(receiver_map));
VARIABLE(var_map, MachineRepresentation::kTagged, receiver_map);
Label loop_body(this, &var_map);
Node* empty_fixed_array = LoadRoot(Heap::kEmptyFixedArrayRootIndex);
Node* empty_slow_element_dictionary =
LoadRoot(Heap::kEmptySlowElementDictionaryRootIndex);
Goto(&loop_body);
BIND(&loop_body);
{
Node* map = var_map.value();
Node* prototype = LoadMapPrototype(map);
GotoIf(IsNull(prototype), definitely_no_elements);
Node* prototype_map = LoadMap(prototype);