0d04e8440e
Avoid the deprecated FLAG_* syntax, access flag values via the
{v8_flags} struct instead.
R=jgruber@chromium.org
Bug: v8:12887
Change-Id: I0454426c664e54e9b8c8b39f903eeca1a80d4bc2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3898933
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83214}
372 lines
15 KiB
C++
372 lines
15 KiB
C++
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/init/v8.h"
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#include "src/api/api.h"
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#include "src/codegen/source-position-table.h"
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#include "src/execution/isolate.h"
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#include "src/heap/factory.h"
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#include "src/interpreter/bytecode-array-writer.h"
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#include "src/interpreter/bytecode-label.h"
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#include "src/interpreter/bytecode-node.h"
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#include "src/interpreter/bytecode-register.h"
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#include "src/interpreter/bytecode-source-info.h"
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#include "src/interpreter/constant-array-builder.h"
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#include "src/utils/utils.h"
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#include "src/objects/objects-inl.h"
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#include "test/unittests/interpreter/bytecode-utils.h"
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#include "test/unittests/test-utils.h"
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namespace v8 {
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namespace internal {
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namespace interpreter {
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namespace bytecode_array_writer_unittest {
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#define B(Name) static_cast<uint8_t>(Bytecode::k##Name)
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#define R(i) static_cast<uint32_t>(Register(i).ToOperand())
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class BytecodeArrayWriterUnittest : public TestWithIsolateAndZone {
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public:
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BytecodeArrayWriterUnittest()
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: constant_array_builder_(zone()),
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bytecode_array_writer_(
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zone(), &constant_array_builder_,
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SourcePositionTableBuilder::RECORD_SOURCE_POSITIONS) {}
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~BytecodeArrayWriterUnittest() override = default;
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void Write(Bytecode bytecode, BytecodeSourceInfo info = BytecodeSourceInfo());
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void Write(Bytecode bytecode, uint32_t operand0,
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BytecodeSourceInfo info = BytecodeSourceInfo());
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void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
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BytecodeSourceInfo info = BytecodeSourceInfo());
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void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
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uint32_t operand2, BytecodeSourceInfo info = BytecodeSourceInfo());
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void Write(Bytecode bytecode, uint32_t operand0, uint32_t operand1,
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uint32_t operand2, uint32_t operand3,
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BytecodeSourceInfo info = BytecodeSourceInfo());
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void WriteJump(Bytecode bytecode, BytecodeLabel* label,
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BytecodeSourceInfo info = BytecodeSourceInfo());
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void WriteJumpLoop(Bytecode bytecode, BytecodeLoopHeader* loop_header,
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int depth, int feedback_index,
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BytecodeSourceInfo info = BytecodeSourceInfo());
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BytecodeArrayWriter* writer() { return &bytecode_array_writer_; }
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ZoneVector<unsigned char>* bytecodes() { return writer()->bytecodes(); }
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SourcePositionTableBuilder* source_position_table_builder() {
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return writer()->source_position_table_builder();
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}
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private:
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ConstantArrayBuilder constant_array_builder_;
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BytecodeArrayWriter bytecode_array_writer_;
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};
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void BytecodeArrayWriterUnittest::Write(Bytecode bytecode,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, info);
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writer()->Write(&node);
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}
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void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, operand0, info);
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writer()->Write(&node);
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}
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void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
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uint32_t operand1,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, operand0, operand1, info);
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writer()->Write(&node);
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}
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void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
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uint32_t operand1, uint32_t operand2,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, operand0, operand1, operand2, info);
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writer()->Write(&node);
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}
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void BytecodeArrayWriterUnittest::Write(Bytecode bytecode, uint32_t operand0,
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uint32_t operand1, uint32_t operand2,
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uint32_t operand3,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, operand0, operand1, operand2, operand3, info);
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writer()->Write(&node);
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}
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void BytecodeArrayWriterUnittest::WriteJump(Bytecode bytecode,
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BytecodeLabel* label,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, 0, info);
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writer()->WriteJump(&node, label);
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}
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void BytecodeArrayWriterUnittest::WriteJumpLoop(Bytecode bytecode,
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BytecodeLoopHeader* loop_header,
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int depth, int feedback_index,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, 0, depth, feedback_index, info);
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writer()->WriteJumpLoop(&node, loop_header);
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}
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TEST_F(BytecodeArrayWriterUnittest, SimpleExample) {
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CHECK_EQ(bytecodes()->size(), 0u);
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Write(Bytecode::kLdaSmi, 127, {55, true});
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CHECK_EQ(bytecodes()->size(), 2u);
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Write(Bytecode::kStar, Register(20).ToOperand());
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CHECK_EQ(bytecodes()->size(), 4u);
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Write(Bytecode::kLdar, Register(200).ToOperand());
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CHECK_EQ(bytecodes()->size(), 8u);
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Write(Bytecode::kReturn, {70, true});
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CHECK_EQ(bytecodes()->size(), 9u);
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static const uint8_t expected_bytes[] = {
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// clang-format off
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/* 0 55 S> */ B(LdaSmi), U8(127),
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/* 2 */ B(Star), R8(20),
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/* 4 */ B(Wide), B(Ldar), R16(200),
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/* 8 70 S> */ B(Return),
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// clang-format on
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};
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
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CHECK_EQ(bytecodes()->at(i), expected_bytes[i]);
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}
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Handle<BytecodeArray> bytecode_array =
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writer()->ToBytecodeArray(isolate(), 0, 0, factory()->empty_byte_array());
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bytecode_array->set_source_position_table(
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*writer()->ToSourcePositionTable(isolate()), kReleaseStore);
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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PositionTableEntry expected_positions[] = {{0, 55, true}, {8, 70, true}};
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SourcePositionTableIterator source_iterator(
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bytecode_array->SourcePositionTable());
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for (size_t i = 0; i < arraysize(expected_positions); ++i) {
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const PositionTableEntry& expected = expected_positions[i];
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CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
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CHECK_EQ(source_iterator.source_position().ScriptOffset(),
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expected.source_position);
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CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
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source_iterator.Advance();
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}
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CHECK(source_iterator.done());
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}
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TEST_F(BytecodeArrayWriterUnittest, ComplexExample) {
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static const uint8_t expected_bytes[] = {
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// clang-format off
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/* 0 42 S> */ B(LdaConstant), U8(0),
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/* 2 42 E> */ B(Add), R8(1), U8(1),
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/* 4 68 S> */ B(JumpIfUndefined), U8(39),
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/* 6 */ B(JumpIfNull), U8(37),
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/* 8 */ B(ToObject), R8(3),
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/* 10 */ B(ForInPrepare), R8(3), U8(4),
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/* 13 */ B(LdaZero),
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/* 14 */ B(Star), R8(7),
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/* 16 63 S> */ B(ForInContinue), R8(7), R8(6),
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/* 19 */ B(JumpIfFalse), U8(24),
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/* 21 */ B(ForInNext), R8(3), R8(7), R8(4), U8(1),
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/* 26 */ B(JumpIfUndefined), U8(9),
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/* 28 */ B(Star), R8(0),
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/* 30 */ B(Ldar), R8(0),
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/* 32 */ B(Star), R8(2),
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/* 34 85 S> */ B(Return),
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/* 35 */ B(ForInStep), R8(7),
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/* 37 */ B(Star), R8(7),
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/* 39 */ B(JumpLoop), U8(23), U8(0), U8(0),
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/* 43 */ B(LdaUndefined),
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/* 44 85 S> */ B(Return),
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// clang-format on
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};
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static const PositionTableEntry expected_positions[] = {
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{0, 42, true}, {2, 42, false}, {5, 68, true},
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{17, 63, true}, {35, 85, true}, {45, 85, true}};
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BytecodeLoopHeader loop_header;
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BytecodeLabel jump_for_in, jump_end_1, jump_end_2, jump_end_3;
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Write(Bytecode::kLdaConstant, U8(0), {42, true});
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Write(Bytecode::kAdd, R(1), U8(1), {42, false});
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WriteJump(Bytecode::kJumpIfUndefined, &jump_end_1, {68, true});
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WriteJump(Bytecode::kJumpIfNull, &jump_end_2);
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Write(Bytecode::kToObject, R(3));
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Write(Bytecode::kForInPrepare, R(3), U8(4));
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Write(Bytecode::kLdaZero);
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Write(Bytecode::kStar, R(7));
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writer()->BindLoopHeader(&loop_header);
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Write(Bytecode::kForInContinue, R(7), R(6), {63, true});
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WriteJump(Bytecode::kJumpIfFalse, &jump_end_3);
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Write(Bytecode::kForInNext, R(3), R(7), R(4), U8(1));
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WriteJump(Bytecode::kJumpIfUndefined, &jump_for_in);
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Write(Bytecode::kStar, R(0));
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Write(Bytecode::kLdar, R(0));
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Write(Bytecode::kStar, R(2));
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Write(Bytecode::kReturn, {85, true});
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writer()->BindLabel(&jump_for_in);
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Write(Bytecode::kForInStep, R(7));
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Write(Bytecode::kStar, R(7));
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WriteJumpLoop(Bytecode::kJumpLoop, &loop_header, 0, 0);
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writer()->BindLabel(&jump_end_1);
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writer()->BindLabel(&jump_end_2);
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writer()->BindLabel(&jump_end_3);
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Write(Bytecode::kLdaUndefined);
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Write(Bytecode::kReturn, {85, true});
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
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CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
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static_cast<int>(expected_bytes[i]));
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}
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Handle<BytecodeArray> bytecode_array =
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writer()->ToBytecodeArray(isolate(), 0, 0, factory()->empty_byte_array());
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bytecode_array->set_source_position_table(
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*writer()->ToSourcePositionTable(isolate()), kReleaseStore);
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SourcePositionTableIterator source_iterator(
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bytecode_array->SourcePositionTable());
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for (size_t i = 0; i < arraysize(expected_positions); ++i) {
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const PositionTableEntry& expected = expected_positions[i];
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CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
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CHECK_EQ(source_iterator.source_position().ScriptOffset(),
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expected.source_position);
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CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
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source_iterator.Advance();
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}
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CHECK(source_iterator.done());
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}
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TEST_F(BytecodeArrayWriterUnittest, ElideNoneffectfulBytecodes) {
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if (!i::v8_flags.ignition_elide_noneffectful_bytecodes) return;
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static const uint8_t expected_bytes[] = {
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// clang-format off
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/* 0 55 S> */ B(Ldar), R8(20),
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/* 2 */ B(Star), R8(20),
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/* 4 */ B(CreateMappedArguments),
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/* 5 60 S> */ B(LdaSmi), U8(127),
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/* 7 70 S> */ B(Ldar), R8(20),
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/* 9 75 S> */ B(Return),
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// clang-format on
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};
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static const PositionTableEntry expected_positions[] = {
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{0, 55, true}, {5, 60, false}, {7, 70, true}, {9, 75, true}};
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Write(Bytecode::kLdaSmi, 127, {55, true}); // Should be elided.
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Write(Bytecode::kLdar, Register(20).ToOperand());
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Write(Bytecode::kStar, Register(20).ToOperand());
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Write(Bytecode::kLdar, Register(20).ToOperand()); // Should be elided.
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Write(Bytecode::kCreateMappedArguments);
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Write(Bytecode::kLdaSmi, 127, {60, false}); // Not elided due to source info.
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Write(Bytecode::kLdar, Register(20).ToOperand(), {70, true});
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Write(Bytecode::kReturn, {75, true});
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
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CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
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static_cast<int>(expected_bytes[i]));
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}
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Handle<BytecodeArray> bytecode_array =
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writer()->ToBytecodeArray(isolate(), 0, 0, factory()->empty_byte_array());
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bytecode_array->set_source_position_table(
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*writer()->ToSourcePositionTable(isolate()), kReleaseStore);
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SourcePositionTableIterator source_iterator(
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bytecode_array->SourcePositionTable());
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for (size_t i = 0; i < arraysize(expected_positions); ++i) {
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const PositionTableEntry& expected = expected_positions[i];
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CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
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CHECK_EQ(source_iterator.source_position().ScriptOffset(),
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expected.source_position);
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CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
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source_iterator.Advance();
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}
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CHECK(source_iterator.done());
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}
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TEST_F(BytecodeArrayWriterUnittest, DeadcodeElimination) {
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static const uint8_t expected_bytes[] = {
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// clang-format off
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/* 0 55 S> */ B(LdaSmi), U8(127),
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/* 2 */ B(Jump), U8(2),
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/* 4 65 S> */ B(LdaSmi), U8(127),
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/* 6 */ B(JumpIfFalse), U8(3),
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/* 8 75 S> */ B(Return),
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/* 9 */ B(JumpIfFalse), U8(3),
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/* 11 */ B(Throw),
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/* 12 */ B(JumpIfFalse), U8(3),
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/* 14 */ B(ReThrow),
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/* 15 */ B(Return),
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// clang-format on
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};
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static const PositionTableEntry expected_positions[] = {
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{0, 55, true}, {4, 65, true}, {8, 75, true}};
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BytecodeLabel after_jump, after_conditional_jump, after_return, after_throw,
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after_rethrow;
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Write(Bytecode::kLdaSmi, 127, {55, true});
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WriteJump(Bytecode::kJump, &after_jump);
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Write(Bytecode::kLdaSmi, 127); // Dead code.
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WriteJump(Bytecode::kJumpIfFalse, &after_conditional_jump); // Dead code.
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writer()->BindLabel(&after_jump);
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// We would bind the after_conditional_jump label here, but the jump to it is
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// dead.
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CHECK(!after_conditional_jump.has_referrer_jump());
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Write(Bytecode::kLdaSmi, 127, {65, true});
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WriteJump(Bytecode::kJumpIfFalse, &after_return);
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Write(Bytecode::kReturn, {75, true});
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Write(Bytecode::kLdaSmi, 127, {100, true}); // Dead code.
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writer()->BindLabel(&after_return);
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WriteJump(Bytecode::kJumpIfFalse, &after_throw);
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Write(Bytecode::kThrow);
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Write(Bytecode::kLdaSmi, 127); // Dead code.
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writer()->BindLabel(&after_throw);
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WriteJump(Bytecode::kJumpIfFalse, &after_rethrow);
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Write(Bytecode::kReThrow);
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Write(Bytecode::kLdaSmi, 127); // Dead code.
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writer()->BindLabel(&after_rethrow);
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Write(Bytecode::kReturn);
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
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CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
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static_cast<int>(expected_bytes[i]));
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}
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Handle<BytecodeArray> bytecode_array =
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writer()->ToBytecodeArray(isolate(), 0, 0, factory()->empty_byte_array());
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bytecode_array->set_source_position_table(
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*writer()->ToSourcePositionTable(isolate()), kReleaseStore);
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SourcePositionTableIterator source_iterator(
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bytecode_array->SourcePositionTable());
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for (size_t i = 0; i < arraysize(expected_positions); ++i) {
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const PositionTableEntry& expected = expected_positions[i];
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CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
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CHECK_EQ(source_iterator.source_position().ScriptOffset(),
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expected.source_position);
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CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
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source_iterator.Advance();
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}
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CHECK(source_iterator.done());
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}
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#undef B
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#undef R
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} // namespace bytecode_array_writer_unittest
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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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