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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 "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodeArrayBuilderTest : public TestWithIsolate {
public:
BytecodeArrayBuilderTest() {}
~BytecodeArrayBuilderTest() override {}
};
TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
BytecodeArrayBuilder builder(isolate());
builder.set_locals_count(1);
CHECK_EQ(builder.locals_count(), 1);
// Emit constant loads.
builder.LoadLiteral(Smi::FromInt(0))
.LoadLiteral(Smi::FromInt(8))
.LoadUndefined()
.LoadNull()
.LoadTheHole()
.LoadTrue()
.LoadFalse();
// Emit accumulator transfers.
Register reg(0);
builder.LoadAccumulatorWithRegister(reg).StoreAccumulatorInRegister(reg);
// Emit binary operators invocations.
builder.BinaryOperation(Token::Value::ADD, reg)
.BinaryOperation(Token::Value::SUB, reg)
.BinaryOperation(Token::Value::MUL, reg)
.BinaryOperation(Token::Value::DIV, reg);
// Emit control flow. Return must be the last instruction.
builder.Return();
// Generate BytecodeArray.
Handle<BytecodeArray> the_array = builder.ToBytecodeArray();
CHECK_EQ(the_array->frame_size(), builder.locals_count() * kPointerSize);
// Build scorecard of bytecodes encountered in the BytecodeArray.
std::vector<int> scorecard(Bytecodes::ToByte(Bytecode::kLast) + 1);
Bytecode final_bytecode = Bytecode::kLdaZero;
for (int i = 0; i < the_array->length(); i++) {
uint8_t code = the_array->get(i);
scorecard[code] += 1;
int operands = Bytecodes::NumberOfOperands(Bytecodes::FromByte(code));
CHECK_LE(operands, Bytecodes::MaximumNumberOfOperands());
final_bytecode = Bytecodes::FromByte(code);
i += operands;
}
// 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 temps = 0; temps < 3; temps++) {
BytecodeArrayBuilder builder(isolate());
builder.set_locals_count(locals);
builder.Return();
TemporaryRegisterScope temporaries(&builder);
for (int i = 0; i < temps; i++) {
temporaries.NewRegister();
}
Handle<BytecodeArray> the_array = builder.ToBytecodeArray();
int total_registers = locals + temps;
CHECK_EQ(the_array->frame_size(), total_registers * kPointerSize);
}
}
}
TEST_F(BytecodeArrayBuilderTest, TemporariesRecycled) {
BytecodeArrayBuilder builder(isolate());
builder.set_locals_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);
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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