f3e4b7c14d
Moves the logic for eliding non-effectful accumulator load elision from the peephole optimizer to the BytecodeArrayWriter. BUG=v8:6194 Change-Id: I05fbe4ee8ac340e5c355285d0b47e4a9d52fd0a8 Reviewed-on: https://chromium-review.googlesource.com/469828 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/master@{#44560}
299 lines
12 KiB
C++
299 lines
12 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/v8.h"
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#include "src/api.h"
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#include "src/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/constant-array-builder.h"
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#include "src/isolate.h"
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#include "src/objects-inl.h"
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#include "src/source-position-table.h"
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#include "src/utils.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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#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 {}
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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, BytecodeLabel* label, int depth,
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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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BytecodeLabel* label, int depth,
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BytecodeSourceInfo info) {
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BytecodeNode node(bytecode, 0, depth, info);
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writer()->WriteJump(&node, label);
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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::kStackCheck, {10, false});
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CHECK_EQ(bytecodes()->size(), 1u);
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Write(Bytecode::kLdaSmi, 127, {55, true});
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CHECK_EQ(bytecodes()->size(), 3u);
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Write(Bytecode::kStar, Register(20).ToOperand());
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CHECK_EQ(bytecodes()->size(), 5u);
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Write(Bytecode::kLdar, Register(200).ToOperand());
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CHECK_EQ(bytecodes()->size(), 9u);
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Write(Bytecode::kReturn, {70, true});
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CHECK_EQ(bytecodes()->size(), 10u);
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static const uint8_t expected_bytes[] = {
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// clang-format off
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/* 0 10 E> */ B(StackCheck),
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/* 1 55 S> */ B(LdaSmi), U8(127),
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/* 3 */ B(Star), R8(20),
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/* 5 */ B(Wide), B(Ldar), R16(200),
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/* 9 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 = writer()->ToBytecodeArray(
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isolate(), 0, 0, factory()->empty_fixed_array());
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CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
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PositionTableEntry expected_positions[] = {
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{0, 10, false}, {1, 55, true}, {9, 70, true}};
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SourcePositionTableIterator source_iterator(
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bytecode_array->source_position_table());
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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 30 E> */ B(StackCheck),
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/* 1 42 S> */ B(LdaConstant), U8(0),
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/* 3 42 E> */ B(Add), R8(1), U8(1),
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/* 5 68 S> */ B(JumpIfUndefined), U8(39),
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/* 7 */ B(JumpIfNull), U8(37),
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/* 9 */ B(ToObject), R8(3),
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/* 11 */ B(ForInPrepare), R8(3), R8(4),
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/* 14 */ B(LdaZero),
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/* 15 */ B(Star), R8(7),
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/* 17 63 S> */ B(ForInContinue), R8(7), R8(6),
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/* 20 */ B(JumpIfFalse), U8(24),
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/* 22 */ B(ForInNext), R8(3), R8(7), R8(4), U8(1),
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/* 27 */ B(JumpIfUndefined), U8(10),
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/* 29 */ B(Star), R8(0),
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/* 31 54 E> */ B(StackCheck),
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/* 32 */ B(Ldar), R8(0),
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/* 34 */ B(Star), R8(2),
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/* 36 85 S> */ B(Return),
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/* 37 */ B(ForInStep), R8(7),
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/* 39 */ B(Star), R8(7),
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/* 41 */ B(JumpLoop), U8(24), U8(0),
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/* 44 */ B(LdaUndefined),
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/* 45 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, 30, false}, {1, 42, true}, {3, 42, false}, {6, 68, true},
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{18, 63, true}, {32, 54, false}, {37, 85, true}, {46, 85, true}};
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BytecodeLabel back_jump, jump_for_in, jump_end_1, jump_end_2, jump_end_3;
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Write(Bytecode::kStackCheck, {30, false});
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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), R(4));
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Write(Bytecode::kLdaZero);
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Write(Bytecode::kStar, R(7));
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writer()->BindLabel(&back_jump);
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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::kStackCheck, {54, false});
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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, &back_jump, 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 = writer()->ToBytecodeArray(
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isolate(), 0, 0, factory()->empty_fixed_array());
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SourcePositionTableIterator source_iterator(
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bytecode_array->source_position_table());
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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::FLAG_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 10 E> */ B(StackCheck),
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/* 1 55 S> */ B(Ldar), R8(20),
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/* 3 */ B(Star), R8(20),
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/* 5 */ B(CreateMappedArguments),
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/* 6 60 S> */ B(LdaSmi), U8(127),
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/* 8 70 S> */ B(Ldar), R8(20),
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/* 10 75 S> */ B(Return),
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// clang-format on
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};
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static const PositionTableEntry expected_positions[] = {{0, 10, false},
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{1, 55, true},
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{6, 60, false},
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{8, 70, true},
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{10, 75, true}};
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Write(Bytecode::kStackCheck, {10, false});
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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 = writer()->ToBytecodeArray(
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isolate(), 0, 0, factory()->empty_fixed_array());
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SourcePositionTableIterator source_iterator(
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bytecode_array->source_position_table());
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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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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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