v8/test/unittests/interpreter/bytecode-array-builder-unittest.cc

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// Copyright 2014 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/v8.h"
#include "src/interpreter/bytecode-array-builder.h"
#include "src/interpreter/bytecode-array-iterator.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodeArrayBuilderTest : public TestWithIsolateAndZone {
public:
BytecodeArrayBuilderTest() {}
~BytecodeArrayBuilderTest() override {}
};
TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_locals_count(2);
builder.set_context_count(1);
builder.set_parameter_count(0);
CHECK_EQ(builder.locals_count(), 2);
CHECK_EQ(builder.context_count(), 1);
CHECK_EQ(builder.fixed_register_count(), 3);
// Emit constant loads.
builder.LoadLiteral(Smi::FromInt(0))
.LoadLiteral(Smi::FromInt(8))
.LoadLiteral(Smi::FromInt(10000000))
.LoadUndefined()
.LoadNull()
.LoadTheHole()
.LoadTrue()
.LoadFalse();
// Emit accumulator transfers. Stores followed by loads to the same register
// are not generated. Hence, a dummy instruction in between.
Register reg(0);
builder.LoadAccumulatorWithRegister(reg)
.LoadNull()
.StoreAccumulatorInRegister(reg);
// Emit register-register transfer.
Register other(1);
builder.MoveRegister(reg, other);
// Emit global load / store operations.
builder.LoadGlobal(0, 1, LanguageMode::SLOPPY, TypeofMode::NOT_INSIDE_TYPEOF)
.LoadGlobal(0, 1, LanguageMode::STRICT, TypeofMode::NOT_INSIDE_TYPEOF)
.LoadGlobal(0, 1, LanguageMode::SLOPPY, TypeofMode::INSIDE_TYPEOF)
.LoadGlobal(0, 1, LanguageMode::STRICT, TypeofMode::INSIDE_TYPEOF)
.StoreGlobal(0, 1, LanguageMode::SLOPPY)
.StoreGlobal(0, 1, LanguageMode::STRICT);
// Emit wide global load / store operations.
builder.LoadGlobal(0, 1024, LanguageMode::SLOPPY,
TypeofMode::NOT_INSIDE_TYPEOF)
.LoadGlobal(1024, 1, LanguageMode::STRICT, TypeofMode::NOT_INSIDE_TYPEOF)
.LoadGlobal(0, 1024, LanguageMode::SLOPPY, TypeofMode::INSIDE_TYPEOF)
.LoadGlobal(1024, 1, LanguageMode::STRICT, TypeofMode::INSIDE_TYPEOF)
.StoreGlobal(0, 1024, LanguageMode::SLOPPY)
.StoreGlobal(1024, 1, LanguageMode::STRICT);
// Emit context operations.
builder.PushContext(reg);
builder.PopContext(reg);
builder.LoadContextSlot(reg, 1);
builder.StoreContextSlot(reg, 1);
// Emit load / store property operations.
builder.LoadNamedProperty(reg, 0, 0, LanguageMode::SLOPPY)
.LoadKeyedProperty(reg, 0, LanguageMode::SLOPPY)
.StoreNamedProperty(reg, 0, 0, LanguageMode::SLOPPY)
.StoreKeyedProperty(reg, reg, 0, LanguageMode::SLOPPY)
.LoadNamedProperty(reg, 0, 0, LanguageMode::STRICT)
.LoadKeyedProperty(reg, 0, LanguageMode::STRICT)
.StoreNamedProperty(reg, 0, 0, LanguageMode::STRICT)
.StoreKeyedProperty(reg, reg, 0, LanguageMode::STRICT);
// Emit wide load / store property operations.
builder.LoadNamedProperty(reg, 2056, 0, LanguageMode::SLOPPY)
.LoadKeyedProperty(reg, 2056, LanguageMode::SLOPPY)
.StoreNamedProperty(reg, 0, 2056, LanguageMode::SLOPPY)
.StoreKeyedProperty(reg, reg, 2056, LanguageMode::SLOPPY)
.LoadNamedProperty(reg, 2056, 0, LanguageMode::STRICT)
.LoadKeyedProperty(reg, 2056, LanguageMode::STRICT)
.StoreNamedProperty(reg, 0, 2056, LanguageMode::STRICT)
.StoreKeyedProperty(reg, reg, 2056, LanguageMode::STRICT);
// Emit closure operations.
builder.CreateClosure(NOT_TENURED);
// Emit argument creation operations.
builder.CreateArguments(CreateArgumentsType::kMappedArguments)
.CreateArguments(CreateArgumentsType::kUnmappedArguments);
// Emit literal creation operations
builder.CreateRegExpLiteral(0, 0)
.CreateArrayLiteral(0, 0)
.CreateObjectLiteral(0, 0);
// Call operations.
builder.Call(reg, reg, 0, 0)
.Call(reg, reg, 0, 1024)
.CallRuntime(Runtime::kIsArray, reg, 1)
.CallJSRuntime(Context::SPREAD_ITERABLE_INDEX, reg, 1);
// Emit binary operator invocations.
builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.BinaryOperation(Token::Value::SUB, reg, Strength::WEAK)
.BinaryOperation(Token::Value::MUL, reg, Strength::WEAK)
.BinaryOperation(Token::Value::DIV, reg, Strength::WEAK)
.BinaryOperation(Token::Value::MOD, reg, Strength::WEAK);
// Emit bitwise operator invocations
builder.BinaryOperation(Token::Value::BIT_OR, reg, Strength::WEAK)
.BinaryOperation(Token::Value::BIT_XOR, reg, Strength::WEAK)
.BinaryOperation(Token::Value::BIT_AND, reg, Strength::WEAK);
// Emit shift operator invocations
builder.BinaryOperation(Token::Value::SHL, reg, Strength::WEAK)
.BinaryOperation(Token::Value::SAR, reg, Strength::WEAK)
.BinaryOperation(Token::Value::SHR, reg, Strength::WEAK);
// Emit count operatior invocations
builder.CountOperation(Token::Value::ADD, Strength::WEAK)
.CountOperation(Token::Value::SUB, Strength::WEAK);
// Emit unary operator invocations.
builder.LogicalNot().TypeOf();
// Emit delete
builder.Delete(reg, LanguageMode::SLOPPY).Delete(reg, LanguageMode::STRICT);
// Emit new.
builder.New(reg, reg, 0);
// Emit test operator invocations.
builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.CompareOperation(Token::Value::NE, reg, Strength::WEAK)
.CompareOperation(Token::Value::EQ_STRICT, reg, Strength::WEAK)
.CompareOperation(Token::Value::NE_STRICT, reg, Strength::WEAK)
.CompareOperation(Token::Value::LT, reg, Strength::WEAK)
.CompareOperation(Token::Value::GT, reg, Strength::WEAK)
.CompareOperation(Token::Value::LTE, reg, Strength::WEAK)
.CompareOperation(Token::Value::GTE, reg, Strength::WEAK)
.CompareOperation(Token::Value::INSTANCEOF, reg, Strength::WEAK)
.CompareOperation(Token::Value::IN, reg, Strength::WEAK);
// Emit cast operator invocations.
builder.CastAccumulatorToNumber()
.CastAccumulatorToBoolean()
.CastAccumulatorToJSObject()
.CastAccumulatorToName();
// Emit control flow. Return must be the last instruction.
BytecodeLabel start;
builder.Bind(&start);
// Short jumps with Imm8 operands
builder.Jump(&start)
.JumpIfNull(&start)
.JumpIfUndefined(&start);
// Perform an operation that returns boolean value to
// generate JumpIfTrue/False
builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&start)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&start);
// Perform an operation that returns a non-boolean operation to
// generate JumpIfToBooleanTrue/False.
builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&start)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&start);
// Insert dummy ops to force longer jumps
for (int i = 0; i < 128; i++) {
builder.LoadTrue();
}
// Longer jumps requiring Constant operand
builder.Jump(&start)
.JumpIfNull(&start)
.JumpIfUndefined(&start);
// Perform an operation that returns boolean value to
// generate JumpIfTrue/False
builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&start)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&start);
// Perform an operation that returns a non-boolean operation to
// generate JumpIfToBooleanTrue/False.
builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&start)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&start);
// Emit throw in it's own basic block so that the rest of the code isn't
// omitted due to being dead.
BytecodeLabel after_throw;
builder.Jump(&after_throw)
.Throw()
.Bind(&after_throw);
builder.ForInPrepare(reg).ForInDone(reg).ForInNext(reg, reg);
// Wide constant pool loads
for (int i = 0; i < 256; i++) {
// Emit junk in constant pool to force wide constant pool index.
builder.GetConstantPoolEntry(handle(Smi::FromInt(i), isolate()));
}
builder.LoadLiteral(Smi::FromInt(20000000));
builder.Return();
// Generate BytecodeArray.
Handle<BytecodeArray> the_array = builder.ToBytecodeArray();
CHECK_EQ(the_array->frame_size(),
builder.fixed_register_count() * kPointerSize);
// Build scorecard of bytecodes encountered in the BytecodeArray.
std::vector<int> scorecard(Bytecodes::ToByte(Bytecode::kLast) + 1);
Bytecode final_bytecode = Bytecode::kLdaZero;
int i = 0;
while (i < the_array->length()) {
uint8_t code = the_array->get(i);
scorecard[code] += 1;
final_bytecode = Bytecodes::FromByte(code);
i += Bytecodes::Size(Bytecodes::FromByte(code));
}
// Check return occurs at the end and only once in the BytecodeArray.
CHECK_EQ(final_bytecode, Bytecode::kReturn);
CHECK_EQ(scorecard[Bytecodes::ToByte(final_bytecode)], 1);
#define CHECK_BYTECODE_PRESENT(Name, ...) \
/* Check Bytecode is marked in scorecard */ \
CHECK_GE(scorecard[Bytecodes::ToByte(Bytecode::k##Name)], 1);
BYTECODE_LIST(CHECK_BYTECODE_PRESENT)
#undef CHECK_BYTECODE_PRESENT
}
TEST_F(BytecodeArrayBuilderTest, FrameSizesLookGood) {
for (int locals = 0; locals < 5; locals++) {
for (int contexts = 0; contexts < 4; contexts++) {
for (int temps = 0; temps < 3; temps++) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(locals);
builder.set_context_count(contexts);
TemporaryRegisterScope temporaries(&builder);
for (int i = 0; i < temps; i++) {
builder.StoreAccumulatorInRegister(temporaries.NewRegister());
}
builder.Return();
Handle<BytecodeArray> the_array = builder.ToBytecodeArray();
int total_registers = locals + contexts + temps;
CHECK_EQ(the_array->frame_size(), total_registers * kPointerSize);
}
}
}
}
TEST_F(BytecodeArrayBuilderTest, TemporariesRecycled) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(0);
builder.set_context_count(0);
builder.Return();
int first;
{
TemporaryRegisterScope temporaries(&builder);
first = temporaries.NewRegister().index();
temporaries.NewRegister();
temporaries.NewRegister();
temporaries.NewRegister();
}
int second;
{
TemporaryRegisterScope temporaries(&builder);
second = temporaries.NewRegister().index();
}
CHECK_EQ(first, second);
}
TEST_F(BytecodeArrayBuilderTest, RegisterValues) {
int index = 1;
uint8_t operand = static_cast<uint8_t>(-index);
Register the_register(index);
CHECK_EQ(the_register.index(), index);
int actual_operand = the_register.ToOperand();
CHECK_EQ(actual_operand, operand);
int actual_index = Register::FromOperand(actual_operand).index();
CHECK_EQ(actual_index, index);
}
TEST_F(BytecodeArrayBuilderTest, Parameters) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(10);
builder.set_locals_count(0);
builder.set_context_count(0);
Register param0(builder.Parameter(0));
Register param9(builder.Parameter(9));
CHECK_EQ(param9.index() - param0.index(), 9);
}
TEST_F(BytecodeArrayBuilderTest, RegisterType) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(10);
builder.set_locals_count(3);
builder.set_context_count(0);
TemporaryRegisterScope temporary_register_scope(&builder);
Register temp0 = temporary_register_scope.NewRegister();
Register param0(builder.Parameter(0));
Register param9(builder.Parameter(9));
Register temp1 = temporary_register_scope.NewRegister();
Register reg0(0);
Register reg1(1);
Register reg2(2);
Register temp2 = temporary_register_scope.NewRegister();
CHECK_EQ(builder.RegisterIsParameterOrLocal(temp0), false);
CHECK_EQ(builder.RegisterIsParameterOrLocal(temp1), false);
CHECK_EQ(builder.RegisterIsParameterOrLocal(temp2), false);
CHECK_EQ(builder.RegisterIsParameterOrLocal(param0), true);
CHECK_EQ(builder.RegisterIsParameterOrLocal(param9), true);
CHECK_EQ(builder.RegisterIsParameterOrLocal(reg0), true);
CHECK_EQ(builder.RegisterIsParameterOrLocal(reg1), true);
CHECK_EQ(builder.RegisterIsParameterOrLocal(reg2), true);
}
TEST_F(BytecodeArrayBuilderTest, Constants) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(0);
builder.set_context_count(0);
Factory* factory = isolate()->factory();
Handle<HeapObject> heap_num_1 = factory->NewHeapNumber(3.14);
Handle<HeapObject> heap_num_2 = factory->NewHeapNumber(5.2);
Handle<Object> large_smi(Smi::FromInt(0x12345678), isolate());
Handle<HeapObject> heap_num_2_copy(*heap_num_2);
builder.LoadLiteral(heap_num_1)
.LoadLiteral(heap_num_2)
.LoadLiteral(large_smi)
.LoadLiteral(heap_num_1)
.LoadLiteral(heap_num_1)
.LoadLiteral(heap_num_2_copy);
Handle<BytecodeArray> array = builder.ToBytecodeArray();
// Should only have one entry for each identical constant.
CHECK_EQ(array->constant_pool()->length(), 3);
}
TEST_F(BytecodeArrayBuilderTest, ForwardJumps) {
static const int kFarJumpDistance = 256;
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(1);
builder.set_context_count(0);
Register reg(0);
BytecodeLabel far0, far1, far2, far3, far4;
BytecodeLabel near0, near1, near2, near3, near4;
builder.Jump(&near0)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&near1)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&near2)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&near3)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&near4)
.Bind(&near0)
.Bind(&near1)
.Bind(&near2)
.Bind(&near3)
.Bind(&near4)
.Jump(&far0)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&far1)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&far2)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&far3)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&far4);
for (int i = 0; i < kFarJumpDistance - 18; i++) {
builder.LoadUndefined();
}
builder.Bind(&far0).Bind(&far1).Bind(&far2).Bind(&far3).Bind(&far4);
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray();
DCHECK_EQ(array->length(), 36 + kFarJumpDistance - 18 + 1);
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 18);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
CHECK_EQ(iterator.GetImmediateOperand(0), 14);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalse);
CHECK_EQ(iterator.GetImmediateOperand(0), 10);
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
CHECK_EQ(iterator.GetImmediateOperand(0), 6);
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpConstant);
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance));
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrueConstant);
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance - 4));
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalseConstant);
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance - 8));
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrueConstant);
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance - 12));
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(),
Bytecode::kJumpIfToBooleanFalseConstant);
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance - 16));
iterator.Advance();
}
TEST_F(BytecodeArrayBuilderTest, BackwardJumps) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(1);
builder.set_context_count(0);
Register reg(0);
BytecodeLabel label0, label1, label2, label3, label4;
builder.Bind(&label0)
.Jump(&label0)
.Bind(&label1)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&label1)
.Bind(&label2)
.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&label2)
.Bind(&label3)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&label3)
.Bind(&label4)
.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&label4);
for (int i = 0; i < 63; i++) {
builder.Jump(&label4);
}
builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfFalse(&label4);
builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
.JumpIfTrue(&label3);
builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfFalse(&label2);
builder.CompareOperation(Token::Value::EQ, reg, Strength::WEAK)
.JumpIfTrue(&label1);
builder.Jump(&label0);
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray();
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalse);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
// Ignore binary operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
// Ignore binary operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
for (int i = 0; i < 63; i++) {
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), -i * 2 - 4);
iterator.Advance();
}
// Ignore binary operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(),
Bytecode::kJumpIfToBooleanFalseConstant);
CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -132);
iterator.Advance();
// Ignore binary operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrueConstant);
CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -140);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalseConstant);
CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -148);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrueConstant);
CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -156);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpConstant);
CHECK_EQ(Smi::cast(*iterator.GetConstantForIndexOperand(0))->value(), -160);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, LabelReuse) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(0);
builder.set_context_count(0);
// Labels can only have 1 forward reference, but
// can be referred to mulitple times once bound.
BytecodeLabel label;
builder.Jump(&label).Bind(&label).Jump(&label).Jump(&label).Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray();
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, LabelAddressReuse) {
static const int kRepeats = 3;
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(0);
builder.set_context_count(0);
for (int i = 0; i < kRepeats; i++) {
BytecodeLabel label;
builder.Jump(&label).Bind(&label).Jump(&label).Jump(&label);
}
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray();
BytecodeArrayIterator iterator(array);
for (int i = 0; i < kRepeats; i++) {
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
CHECK_EQ(iterator.GetImmediateOperand(0), -2);
iterator.Advance();
}
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, ToBoolean) {
BytecodeArrayBuilder builder(isolate(), zone());
builder.set_parameter_count(0);
builder.set_locals_count(0);
builder.set_context_count(0);
// Check ToBoolean emitted at start of a basic block.
builder.CastAccumulatorToBoolean();
// Check ToBoolean emitted preceding bytecode is non-boolean.
builder.LoadNull().CastAccumulatorToBoolean();
// Check ToBoolean omitted if preceding bytecode is boolean.
builder.LoadFalse().CastAccumulatorToBoolean();
// Check ToBoolean emitted if it is at the start of a basic block caused by a
// bound label.
BytecodeLabel label;
builder.LoadFalse()
.Bind(&label)
.CastAccumulatorToBoolean();
// Check ToBoolean emitted if it is at the start of a basic block caused by a
// jump.
builder.LoadFalse()
.JumpIfTrue(&label)
.CastAccumulatorToBoolean();
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray();
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kToBoolean);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaNull);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kToBoolean);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaFalse);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaFalse);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kToBoolean);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaFalse);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kToBoolean);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
} // namespace interpreter
} // namespace internal
} // namespace v8