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v8/test/unittests/interpreter/bytecode-array-writer-unittest.cc
kozyatinskiy 81bb72c11c [inspector] cache stack frame for call sites 
Usually program doesn't contain a lot of different stack frames in collected stack trace.

BUG=v8:6189
R=yangguo@chromium.orr
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2788413004
Cr-Commit-Position: refs/heads/master@{#44622}
2017-04-12 18:33:20 +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/api.h"
#include "src/factory.h"
#include "src/interpreter/bytecode-array-writer.h"
#include "src/interpreter/bytecode-label.h"
#include "src/interpreter/bytecode-node.h"
#include "src/interpreter/bytecode-register.h"
#include "src/interpreter/bytecode-source-info.h"
#include "src/interpreter/constant-array-builder.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/source-position-table.h"
#include "src/utils.h"
#include "test/unittests/interpreter/bytecode-utils.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
#define R(i) static_cast<uint32_t>(Register(i).ToOperand())
class BytecodeArrayWriterUnittest : public TestWithIsolateAndZone {
public:
BytecodeArrayWriterUnittest()
: constant_array_builder_(zone()),
bytecode_array_writer_(
zone(), &constant_array_builder_,
SourcePositionTableBuilder::RECORD_SOURCE_POSITIONS) {}
~BytecodeArrayWriterUnittest() override {}
void Write(Bytecode bytecode, BytecodeSourceInfo info = BytecodeSourceInfo());
void Write(Bytecode bytecode, uint32_t operand0,
BytecodeSourceInfo info = BytecodeSourceInfo());
void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
BytecodeSourceInfo info = BytecodeSourceInfo());
void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
uint32_t operand2, BytecodeSourceInfo info = BytecodeSourceInfo());
void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
uint32_t operand2, uint32_t operand3,
BytecodeSourceInfo info = BytecodeSourceInfo());
void WriteJump(Bytecode bytecode, BytecodeLabel* label,
BytecodeSourceInfo info = BytecodeSourceInfo());
void WriteJumpLoop(Bytecode bytecode, BytecodeLabel* label, int depth,
BytecodeSourceInfo info = BytecodeSourceInfo());
BytecodeArrayWriter* writer() { return &bytecode_array_writer_; }
ZoneVector<unsigned char>* bytecodes() { return writer()->bytecodes(); }
SourcePositionTableBuilder* source_position_table_builder() {
return writer()->source_position_table_builder();
}
private:
ConstantArrayBuilder constant_array_builder_;
BytecodeArrayWriter bytecode_array_writer_;
};
void BytecodeArrayWriterUnittest::Write(Bytecode bytecode,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, info);
writer()->Write(&node);
}
void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, operand0, info);
writer()->Write(&node);
}
void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
uint32_t operand1,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, operand0, operand1, info);
writer()->Write(&node);
}
void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
uint32_t operand1, uint32_t operand2,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, operand0, operand1, operand2, info);
writer()->Write(&node);
}
void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
uint32_t operand1, uint32_t operand2,
uint32_t operand3,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, operand0, operand1, operand2, operand3, info);
writer()->Write(&node);
}
void BytecodeArrayWriterUnittest::WriteJump(Bytecode bytecode,
BytecodeLabel* label,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, 0, info);
writer()->WriteJump(&node, label);
}
void BytecodeArrayWriterUnittest::WriteJumpLoop(Bytecode bytecode,
BytecodeLabel* label, int depth,
BytecodeSourceInfo info) {
BytecodeNode node(bytecode, 0, depth, info);
writer()->WriteJump(&node, label);
}
TEST_F(BytecodeArrayWriterUnittest, SimpleExample) {
CHECK_EQ(bytecodes()->size(), 0u);
Write(Bytecode::kStackCheck, {10, false});
CHECK_EQ(bytecodes()->size(), 1u);
Write(Bytecode::kLdaSmi, 127, {55, true});
CHECK_EQ(bytecodes()->size(), 3u);
Write(Bytecode::kStar, Register(20).ToOperand());
CHECK_EQ(bytecodes()->size(), 5u);
Write(Bytecode::kLdar, Register(200).ToOperand());
CHECK_EQ(bytecodes()->size(), 9u);
Write(Bytecode::kReturn, {70, true});
CHECK_EQ(bytecodes()->size(), 10u);
static const uint8_t expected_bytes[] = {
// clang-format off
/* 0 10 E> */ B(StackCheck),
/* 1 55 S> */ B(LdaSmi), U8(127),
/* 3 */ B(Star), R8(20),
/* 5 */ B(Wide), B(Ldar), R16(200),
/* 9 70 S> */ B(Return),
// clang-format on
};
CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
CHECK_EQ(bytecodes()->at(i), expected_bytes[i]);
}
Handle<BytecodeArray> bytecode_array = writer()->ToBytecodeArray(
isolate(), 0, 0, factory()->empty_fixed_array());
CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
PositionTableEntry expected_positions[] = {
{0, 10, false}, {1, 55, true}, {9, 70, true}};
SourcePositionTableIterator source_iterator(
bytecode_array->SourcePositionTable());
for (size_t i = 0; i < arraysize(expected_positions); ++i) {
const PositionTableEntry& expected = expected_positions[i];
CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
CHECK_EQ(source_iterator.source_position().ScriptOffset(),
expected.source_position);
CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
source_iterator.Advance();
}
CHECK(source_iterator.done());
}
TEST_F(BytecodeArrayWriterUnittest, ComplexExample) {
static const uint8_t expected_bytes[] = {
// clang-format off
/* 0 30 E> */ B(StackCheck),
/* 1 42 S> */ B(LdaConstant), U8(0),
/* 3 42 E> */ B(Add), R8(1), U8(1),
/* 5 68 S> */ B(JumpIfUndefined), U8(39),
/* 7 */ B(JumpIfNull), U8(37),
/* 9 */ B(ToObject), R8(3),
/* 11 */ B(ForInPrepare), R8(3), R8(4),
/* 14 */ B(LdaZero),
/* 15 */ B(Star), R8(7),
/* 17 63 S> */ B(ForInContinue), R8(7), R8(6),
/* 20 */ B(JumpIfFalse), U8(24),
/* 22 */ B(ForInNext), R8(3), R8(7), R8(4), U8(1),
/* 27 */ B(JumpIfUndefined), U8(10),
/* 29 */ B(Star), R8(0),
/* 31 54 E> */ B(StackCheck),
/* 32 */ B(Ldar), R8(0),
/* 34 */ B(Star), R8(2),
/* 36 85 S> */ B(Return),
/* 37 */ B(ForInStep), R8(7),
/* 39 */ B(Star), R8(7),
/* 41 */ B(JumpLoop), U8(24), U8(0),
/* 44 */ B(LdaUndefined),
/* 45 85 S> */ B(Return),
// clang-format on
};
static const PositionTableEntry expected_positions[] = {
{0, 30, false}, {1, 42, true}, {3, 42, false}, {6, 68, true},
{18, 63, true}, {32, 54, false}, {37, 85, true}, {46, 85, true}};
BytecodeLabel back_jump, jump_for_in, jump_end_1, jump_end_2, jump_end_3;
Write(Bytecode::kStackCheck, {30, false});
Write(Bytecode::kLdaConstant, U8(0), {42, true});
Write(Bytecode::kAdd, R(1), U8(1), {42, false});
WriteJump(Bytecode::kJumpIfUndefined, &jump_end_1, {68, true});
WriteJump(Bytecode::kJumpIfNull, &jump_end_2);
Write(Bytecode::kToObject, R(3));
Write(Bytecode::kForInPrepare, R(3), R(4));
Write(Bytecode::kLdaZero);
Write(Bytecode::kStar, R(7));
writer()->BindLabel(&back_jump);
Write(Bytecode::kForInContinue, R(7), R(6), {63, true});
WriteJump(Bytecode::kJumpIfFalse, &jump_end_3);
Write(Bytecode::kForInNext, R(3), R(7), R(4), U8(1));
WriteJump(Bytecode::kJumpIfUndefined, &jump_for_in);
Write(Bytecode::kStar, R(0));
Write(Bytecode::kStackCheck, {54, false});
Write(Bytecode::kLdar, R(0));
Write(Bytecode::kStar, R(2));
Write(Bytecode::kReturn, {85, true});
writer()->BindLabel(&jump_for_in);
Write(Bytecode::kForInStep, R(7));
Write(Bytecode::kStar, R(7));
WriteJumpLoop(Bytecode::kJumpLoop, &back_jump, 0);
writer()->BindLabel(&jump_end_1);
writer()->BindLabel(&jump_end_2);
writer()->BindLabel(&jump_end_3);
Write(Bytecode::kLdaUndefined);
Write(Bytecode::kReturn, {85, true});
CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
static_cast<int>(expected_bytes[i]));
}
Handle<BytecodeArray> bytecode_array = writer()->ToBytecodeArray(
isolate(), 0, 0, factory()->empty_fixed_array());
SourcePositionTableIterator source_iterator(
bytecode_array->SourcePositionTable());
for (size_t i = 0; i < arraysize(expected_positions); ++i) {
const PositionTableEntry& expected = expected_positions[i];
CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
CHECK_EQ(source_iterator.source_position().ScriptOffset(),
expected.source_position);
CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
source_iterator.Advance();
}
CHECK(source_iterator.done());
}
TEST_F(BytecodeArrayWriterUnittest, ElideNoneffectfulBytecodes) {
if (!i::FLAG_ignition_elide_noneffectful_bytecodes) return;
static const uint8_t expected_bytes[] = {
// clang-format off
/* 0 10 E> */ B(StackCheck),
/* 1 55 S> */ B(Ldar), R8(20),
/* 3 */ B(Star), R8(20),
/* 5 */ B(CreateMappedArguments),
/* 6 60 S> */ B(LdaSmi), U8(127),
/* 8 70 S> */ B(Ldar), R8(20),
/* 10 75 S> */ B(Return),
// clang-format on
};
static const PositionTableEntry expected_positions[] = {{0, 10, false},
{1, 55, true},
{6, 60, false},
{8, 70, true},
{10, 75, true}};
Write(Bytecode::kStackCheck, {10, false});
Write(Bytecode::kLdaSmi, 127, {55, true}); // Should be elided.
Write(Bytecode::kLdar, Register(20).ToOperand());
Write(Bytecode::kStar, Register(20).ToOperand());
Write(Bytecode::kLdar, Register(20).ToOperand()); // Should be elided.
Write(Bytecode::kCreateMappedArguments);
Write(Bytecode::kLdaSmi, 127, {60, false}); // Not elided due to source info.
Write(Bytecode::kLdar, Register(20).ToOperand(), {70, true});
Write(Bytecode::kReturn, {75, true});
CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
static_cast<int>(expected_bytes[i]));
}
Handle<BytecodeArray> bytecode_array = writer()->ToBytecodeArray(
isolate(), 0, 0, factory()->empty_fixed_array());
SourcePositionTableIterator source_iterator(
bytecode_array->SourcePositionTable());
for (size_t i = 0; i < arraysize(expected_positions); ++i) {
const PositionTableEntry& expected = expected_positions[i];
CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
CHECK_EQ(source_iterator.source_position().ScriptOffset(),
expected.source_position);
CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
source_iterator.Advance();
}
CHECK(source_iterator.done());
}
TEST_F(BytecodeArrayWriterUnittest, DeadcodeElimination) {
static const uint8_t expected_bytes[] = {
// clang-format off
/* 0 10 E> */ B(StackCheck),
/* 1 55 S> */ B(LdaSmi), U8(127),
/* 3 */ B(Jump), U8(2),
/* 5 65 S> */ B(LdaSmi), U8(127),
/* 7 */ B(JumpIfFalse), U8(3),
/* 9 75 S> */ B(Return),
/* 10 */ B(JumpIfFalse), U8(3),
/* 12 */ B(Throw),
/* 13 */ B(JumpIfFalse), U8(3),
/* 15 */ B(ReThrow),
/* 16 */ B(Return),
// clang-format on
};
static const PositionTableEntry expected_positions[] = {
{0, 10, false}, {1, 55, true}, {5, 65, true}, {9, 75, true}};
BytecodeLabel after_jump, after_conditional_jump, after_return, after_throw,
after_rethrow;
Write(Bytecode::kStackCheck, {10, false});
Write(Bytecode::kLdaSmi, 127, {55, true});
WriteJump(Bytecode::kJump, &after_jump);
Write(Bytecode::kLdaSmi, 127); // Dead code.
WriteJump(Bytecode::kJumpIfFalse, &after_conditional_jump); // Dead code.
writer()->BindLabel(&after_jump);
writer()->BindLabel(&after_conditional_jump);
Write(Bytecode::kLdaSmi, 127, {65, true});
WriteJump(Bytecode::kJumpIfFalse, &after_return);
Write(Bytecode::kReturn, {75, true});
Write(Bytecode::kLdaSmi, 127, {100, true}); // Dead code.
writer()->BindLabel(&after_return);
WriteJump(Bytecode::kJumpIfFalse, &after_throw);
Write(Bytecode::kThrow);
Write(Bytecode::kLdaSmi, 127); // Dead code.
writer()->BindLabel(&after_throw);
WriteJump(Bytecode::kJumpIfFalse, &after_rethrow);
Write(Bytecode::kReThrow);
Write(Bytecode::kLdaSmi, 127); // Dead code.
writer()->BindLabel(&after_rethrow);
Write(Bytecode::kReturn);
CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
static_cast<int>(expected_bytes[i]));
}
Handle<BytecodeArray> bytecode_array = writer()->ToBytecodeArray(
isolate(), 0, 0, factory()->empty_fixed_array());
SourcePositionTableIterator source_iterator(
bytecode_array->SourcePositionTable());
for (size_t i = 0; i < arraysize(expected_positions); ++i) {
const PositionTableEntry& expected = expected_positions[i];
CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
CHECK_EQ(source_iterator.source_position().ScriptOffset(),
expected.source_position);
CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
source_iterator.Advance();
}
CHECK(source_iterator.done());
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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