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v8/test/unittests/interpreter/bytecode-peephole-optimizer-unittest.cc
oth 303d340f66 [interpreter] Minor clean-up of BytecodeSourceInfo. 
Add explicit state in BytecodeSourceInfo to simplify checks for
validity and whether a statement or expression position.

Remove BytecodeSourceInfo::Update which inherited rules for updating
source position information during bytecode building.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/2048203002
Cr-Commit-Position: refs/heads/master@{#37136}
2016-06-21 11:12:31 +00:00

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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/v8.h"
#include "src/factory.h"
#include "src/interpreter/bytecode-label.h"
#include "src/interpreter/bytecode-peephole-optimizer.h"
#include "src/interpreter/constant-array-builder.h"
#include "src/objects-inl.h"
#include "src/objects.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodePeepholeOptimizerTest : public BytecodePipelineStage,
public TestWithIsolateAndZone {
public:
BytecodePeepholeOptimizerTest()
: constant_array_builder_(isolate(), zone()),
peephole_optimizer_(&constant_array_builder_, this) {}
~BytecodePeepholeOptimizerTest() override {}
void Write(BytecodeNode* node) override {
write_count_++;
last_written_.Clone(node);
}
void WriteJump(BytecodeNode* node, BytecodeLabel* label) override {
write_count_++;
last_written_.Clone(node);
}
void BindLabel(BytecodeLabel* label) override {}
void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override {}
Handle<BytecodeArray> ToBytecodeArray(
int fixed_register_count, int parameter_count,
Handle<FixedArray> handle_table) override {
return Handle<BytecodeArray>();
}
void Flush() {
optimizer()->ToBytecodeArray(0, 0, factory()->empty_fixed_array());
}
BytecodePeepholeOptimizer* optimizer() { return &peephole_optimizer_; }
ConstantArrayBuilder* constant_array() { return &constant_array_builder_; }
int write_count() const { return write_count_; }
const BytecodeNode& last_written() const { return last_written_; }
private:
ConstantArrayBuilder constant_array_builder_;
BytecodePeepholeOptimizer peephole_optimizer_;
int write_count_ = 0;
BytecodeNode last_written_;
};
// Sanity tests.
TEST_F(BytecodePeepholeOptimizerTest, FlushOnJump) {
CHECK_EQ(write_count(), 0);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand());
optimizer()->Write(&add);
CHECK_EQ(write_count(), 0);
BytecodeLabel target;
BytecodeNode jump(Bytecode::kJump, 0);
optimizer()->WriteJump(&jump, &target);
CHECK_EQ(write_count(), 2);
CHECK_EQ(jump, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, FlushOnBind) {
CHECK_EQ(write_count(), 0);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand());
optimizer()->Write(&add);
CHECK_EQ(write_count(), 0);
BytecodeLabel target;
optimizer()->BindLabel(&target);
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
// Nop elimination tests.
TEST_F(BytecodePeepholeOptimizerTest, ElideEmptyNop) {
BytecodeNode nop(Bytecode::kNop);
optimizer()->Write(&nop);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand());
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, ElideExpressionNop) {
BytecodeNode nop(Bytecode::kNop);
nop.source_info().MakeExpressionPosition(3);
optimizer()->Write(&nop);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand());
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(add, last_written());
}
TEST_F(BytecodePeepholeOptimizerTest, KeepStatementNop) {
BytecodeNode nop(Bytecode::kNop);
nop.source_info().MakeStatementPosition(3);
optimizer()->Write(&nop);
BytecodeNode add(Bytecode::kAdd, Register(0).ToOperand());
add.source_info().MakeExpressionPosition(3);
optimizer()->Write(&add);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(add, last_written());
}
// Tests covering BytecodePeepholeOptimizer::UpdateCurrentBytecode().
TEST_F(BytecodePeepholeOptimizerTest, KeepJumpIfToBooleanTrue) {
BytecodeNode first(Bytecode::kLdaNull);
BytecodeNode second(Bytecode::kJumpIfToBooleanTrue, 3);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, ElideJumpIfToBooleanTrue) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kJumpIfToBooleanTrue, 3);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kJumpIfTrue);
CHECK_EQ(last_written().operand(0), second.operand(0));
}
TEST_F(BytecodePeepholeOptimizerTest, KeepToBooleanLogicalNot) {
BytecodeNode first(Bytecode::kLdaNull);
BytecodeNode second(Bytecode::kToBooleanLogicalNot);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, ElideToBooleanLogicalNot) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kToBooleanLogicalNot);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLogicalNot);
}
// Tests covering BytecodePeepholeOptimizer::CanElideCurrent().
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRy) {
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(1).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRx) {
BytecodeLabel label;
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand());
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 1);
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRxStatement) {
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand());
second.source_info().MakeStatementPosition(0);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kNop);
CHECK_EQ(last_written().source_info(), second.source_info());
}
TEST_F(BytecodePeepholeOptimizerTest, StarRxLdarRxStatementStarRy) {
BytecodeLabel label;
BytecodeNode first(Bytecode::kStar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kLdar, Register(0).ToOperand());
BytecodeNode third(Bytecode::kStar, Register(3).ToOperand());
second.source_info().MakeStatementPosition(0);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
optimizer()->Write(&third);
CHECK_EQ(write_count(), 1);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), third);
}
TEST_F(BytecodePeepholeOptimizerTest, LdarToName) {
BytecodeNode first(Bytecode::kLdar, Register(0).ToOperand());
BytecodeNode second(Bytecode::kToName);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, ToNameToName) {
BytecodeNode first(Bytecode::kToName);
BytecodeNode second(Bytecode::kToName);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 1);
}
TEST_F(BytecodePeepholeOptimizerTest, TypeOfToName) {
BytecodeNode first(Bytecode::kTypeOf);
BytecodeNode second(Bytecode::kToName);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 1);
}
TEST_F(BytecodePeepholeOptimizerTest, LdaConstantStringToName) {
Handle<Object> word =
isolate()->factory()->NewStringFromStaticChars("optimizing");
size_t index = constant_array()->Insert(word);
BytecodeNode first(Bytecode::kLdaConstant, static_cast<uint32_t>(index));
BytecodeNode second(Bytecode::kToName);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 1);
}
TEST_F(BytecodePeepholeOptimizerTest, LdaConstantNumberToName) {
Handle<Object> word = isolate()->factory()->NewNumber(0.380);
size_t index = constant_array()->Insert(word);
BytecodeNode first(Bytecode::kLdaConstant, static_cast<uint32_t>(index));
BytecodeNode second(Bytecode::kToName);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), first);
Flush();
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written(), second);
}
// Tests covering BytecodePeepholeOptimizer::CanElideLast().
TEST_F(BytecodePeepholeOptimizerTest, LdaTrueLdaFalse) {
BytecodeNode first(Bytecode::kLdaTrue);
BytecodeNode second(Bytecode::kLdaFalse);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, LdaTrueStatementLdaFalse) {
BytecodeNode first(Bytecode::kLdaTrue);
first.source_info().MakeExpressionPosition(3);
BytecodeNode second(Bytecode::kLdaFalse);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
CHECK(second.source_info().is_expression());
CHECK_EQ(second.source_info().source_position(), 3);
}
TEST_F(BytecodePeepholeOptimizerTest, NopStackCheck) {
BytecodeNode first(Bytecode::kNop);
BytecodeNode second(Bytecode::kStackCheck);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written(), second);
}
TEST_F(BytecodePeepholeOptimizerTest, NopStatementStackCheck) {
BytecodeNode first(Bytecode::kNop);
first.source_info().MakeExpressionPosition(3);
BytecodeNode second(Bytecode::kStackCheck);
optimizer()->Write(&first);
CHECK_EQ(write_count(), 0);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 0);
Flush();
CHECK_EQ(write_count(), 1);
second.source_info().MakeExpressionPosition(
first.source_info().source_position());
CHECK_EQ(last_written(), second);
}
// Tests covering BytecodePeepholeOptimizer::UpdateLastAndCurrentBytecodes().
TEST_F(BytecodePeepholeOptimizerTest, MergeLoadICStar) {
const uint32_t operands[] = {
static_cast<uint32_t>(Register(31).ToOperand()), 32, 33,
static_cast<uint32_t>(Register(256).ToOperand())};
const int expected_operand_count = static_cast<int>(arraysize(operands));
BytecodeNode first(Bytecode::kLdaNamedProperty, operands[0], operands[1],
operands[2]);
BytecodeNode second(Bytecode::kStar, operands[3]);
BytecodeNode third(Bytecode::kReturn);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdrNamedProperty);
CHECK_EQ(last_written().operand_count(), expected_operand_count);
for (int i = 0; i < expected_operand_count; ++i) {
CHECK_EQ(last_written().operand(i), operands[i]);
}
optimizer()->Write(&third);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
Flush();
CHECK_EQ(last_written().bytecode(), third.bytecode());
}
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaKeyedPropertyStar) {
const uint32_t operands[] = {static_cast<uint32_t>(Register(31).ToOperand()),
9999997,
static_cast<uint32_t>(Register(1).ToOperand())};
const int expected_operand_count = static_cast<int>(arraysize(operands));
BytecodeNode first(Bytecode::kLdaKeyedProperty, operands[0], operands[1]);
BytecodeNode second(Bytecode::kStar, operands[2]);
BytecodeNode third(Bytecode::kReturn);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdrKeyedProperty);
CHECK_EQ(last_written().operand_count(), expected_operand_count);
for (int i = 0; i < expected_operand_count; ++i) {
CHECK_EQ(last_written().operand(i), operands[i]);
}
optimizer()->Write(&third);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
Flush();
CHECK_EQ(last_written().bytecode(), third.bytecode());
}
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaGlobalStar) {
const uint32_t operands[] = {54321, 19191,
static_cast<uint32_t>(Register(1).ToOperand())};
const int expected_operand_count = static_cast<int>(arraysize(operands));
BytecodeNode first(Bytecode::kLdaGlobal, operands[0], operands[1]);
BytecodeNode second(Bytecode::kStar, operands[2]);
BytecodeNode third(Bytecode::kReturn);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdrGlobal);
CHECK_EQ(last_written().operand_count(), expected_operand_count);
for (int i = 0; i < expected_operand_count; ++i) {
CHECK_EQ(last_written().operand(i), operands[i]);
}
optimizer()->Write(&third);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
Flush();
CHECK_EQ(last_written().bytecode(), third.bytecode());
}
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaContextSlotStar) {
const uint32_t operands[] = {
static_cast<uint32_t>(Register(200000).ToOperand()), 55005500,
static_cast<uint32_t>(Register(1).ToOperand())};
const int expected_operand_count = static_cast<int>(arraysize(operands));
BytecodeNode first(Bytecode::kLdaContextSlot, operands[0], operands[1]);
BytecodeNode second(Bytecode::kStar, operands[2]);
BytecodeNode third(Bytecode::kReturn);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdrContextSlot);
CHECK_EQ(last_written().operand_count(), expected_operand_count);
for (int i = 0; i < expected_operand_count; ++i) {
CHECK_EQ(last_written().operand(i), operands[i]);
}
optimizer()->Write(&third);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
Flush();
CHECK_EQ(last_written().bytecode(), third.bytecode());
}
TEST_F(BytecodePeepholeOptimizerTest, MergeLdaUndefinedStar) {
const uint32_t operands[] = {
static_cast<uint32_t>(Register(100000).ToOperand())};
const int expected_operand_count = static_cast<int>(arraysize(operands));
BytecodeNode first(Bytecode::kLdaUndefined);
BytecodeNode second(Bytecode::kStar, operands[0]);
BytecodeNode third(Bytecode::kReturn);
optimizer()->Write(&first);
optimizer()->Write(&second);
CHECK_EQ(write_count(), 1);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdrUndefined);
CHECK_EQ(last_written().operand_count(), expected_operand_count);
for (int i = 0; i < expected_operand_count; ++i) {
CHECK_EQ(last_written().operand(i), operands[i]);
}
optimizer()->Write(&third);
CHECK_EQ(write_count(), 2);
CHECK_EQ(last_written().bytecode(), Bytecode::kLdar);
CHECK_EQ(last_written().operand(0), operands[expected_operand_count - 1]);
Flush();
CHECK_EQ(last_written().bytecode(), third.bytecode());
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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