b5f146a02a
Introduces: - a new AST node representing the GetIterator() algorithm in the specification, to be used by ForOfStatement, YieldExpression (in the case of delegating yield*), and the future `for-await-of` loop proposed in http://tc39.github.io/proposal-async-iteration/#sec-async-iterator-value-unwrap-functions. - a new opcode (JumpIfJSReceiver), which is useful for `if Type(object) is not Object` checks which are common throughout the specification. This node is easily eliminated by TurboFan. The AST node is desugared specially in bytecode, rather than manually when building the AST. The benefit of this is that desugaring in the BytecodeGenerator is much simpler and easier to understand than desugaring the AST. This also reduces parse time very slightly, and allows us to use LoadIC rather than KeyedLoadIC, which seems to have better baseline performance. This results in a ~20% improvement in test/js-perf-test/Iterators micro-benchmarks, which I believe owes to the use of the slightly faster LoadIC as opposed to the KeyedLoadIC in the baseline case. Both produce identical optimized code via TurboFan when the type check can be eliminated, and the load can be replaced with a constant value. BUG=v8:4280 R=bmeurer@chromium.org, rmcilroy@chromium.org, adamk@chromium.org, neis@chromium.org, jarin@chromium.org TBR=rossberg@chromium.org Review-Url: https://codereview.chromium.org/2557593004 Cr-Commit-Position: refs/heads/master@{#41555}
753 lines
26 KiB
C++
753 lines
26 KiB
C++
// Copyright 2014 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/interpreter/bytecode-array-builder.h"
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#include "src/interpreter/bytecode-array-iterator.h"
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#include "src/interpreter/bytecode-label.h"
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#include "src/interpreter/bytecode-register-allocator.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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class BytecodeArrayBuilderTest : public TestWithIsolateAndZone {
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public:
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BytecodeArrayBuilderTest() {}
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~BytecodeArrayBuilderTest() override {}
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};
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TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
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CanonicalHandleScope canonical(isolate());
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BytecodeArrayBuilder builder(isolate(), zone(), 0, 1, 131);
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Factory* factory = isolate()->factory();
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CHECK_EQ(builder.locals_count(), 131);
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CHECK_EQ(builder.context_count(), 1);
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CHECK_EQ(builder.fixed_register_count(), 132);
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Register reg(0);
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Register other(reg.index() + 1);
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Register wide(128);
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RegisterList reg_list;
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RegisterList pair(0, 2), triple(0, 3);
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// Emit argument creation operations.
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builder.CreateArguments(CreateArgumentsType::kMappedArguments)
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.CreateArguments(CreateArgumentsType::kUnmappedArguments)
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.CreateArguments(CreateArgumentsType::kRestParameter);
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// Emit constant loads.
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builder.LoadLiteral(Smi::kZero)
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.StoreAccumulatorInRegister(reg)
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.LoadLiteral(Smi::FromInt(8))
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.CompareOperation(Token::Value::NE, reg,
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1) // Prevent peephole optimization
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// LdaSmi, Star -> LdrSmi.
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.StoreAccumulatorInRegister(reg)
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.LoadLiteral(Smi::FromInt(10000000))
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.StoreAccumulatorInRegister(reg)
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.LoadLiteral(factory->NewStringFromStaticChars("A constant"))
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.StoreAccumulatorInRegister(reg)
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.LoadUndefined()
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.StoreAccumulatorInRegister(reg)
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.LoadNull()
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.StoreAccumulatorInRegister(reg)
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.LoadTheHole()
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.StoreAccumulatorInRegister(reg)
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.LoadTrue()
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.StoreAccumulatorInRegister(reg)
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.LoadFalse()
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.StoreAccumulatorInRegister(wide);
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// Emit Ldar and Star taking care to foil the register optimizer.
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builder.StackCheck(0)
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.LoadAccumulatorWithRegister(other)
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.BinaryOperation(Token::ADD, reg, 1)
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.StoreAccumulatorInRegister(reg)
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.LoadNull();
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// Emit register-register transfer.
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builder.MoveRegister(reg, other);
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builder.MoveRegister(reg, wide);
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// Emit global load / store operations.
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Handle<String> name = factory->NewStringFromStaticChars("var_name");
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builder.LoadGlobal(name, 1, TypeofMode::NOT_INSIDE_TYPEOF)
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.LoadGlobal(name, 1, TypeofMode::INSIDE_TYPEOF)
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.StoreGlobal(name, 1, LanguageMode::SLOPPY)
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.StoreGlobal(name, 1, LanguageMode::STRICT);
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// Emit context operations.
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builder.PushContext(reg)
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.PopContext(reg)
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.LoadContextSlot(reg, 1, 0)
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.StoreContextSlot(reg, 1, 0);
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// Emit context operations which operate on the local context.
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builder.LoadContextSlot(Register::current_context(), 1, 0)
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.StoreContextSlot(Register::current_context(), 1, 0);
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// Emit load / store property operations.
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builder.LoadNamedProperty(reg, name, 0)
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.LoadKeyedProperty(reg, 0)
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.StoreNamedProperty(reg, name, 0, LanguageMode::SLOPPY)
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.StoreKeyedProperty(reg, reg, 0, LanguageMode::SLOPPY)
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.StoreNamedProperty(reg, name, 0, LanguageMode::STRICT)
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.StoreKeyedProperty(reg, reg, 0, LanguageMode::STRICT);
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// Emit load / store lookup slots.
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builder.LoadLookupSlot(name, TypeofMode::NOT_INSIDE_TYPEOF)
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.LoadLookupSlot(name, TypeofMode::INSIDE_TYPEOF)
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.StoreLookupSlot(name, LanguageMode::SLOPPY)
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.StoreLookupSlot(name, LanguageMode::STRICT);
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// Emit load / store lookup slots with context fast paths.
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builder.LoadLookupContextSlot(name, TypeofMode::NOT_INSIDE_TYPEOF, 1, 0)
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.LoadLookupContextSlot(name, TypeofMode::INSIDE_TYPEOF, 1, 0);
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// Emit load / store lookup slots with global fast paths.
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builder.LoadLookupGlobalSlot(name, TypeofMode::NOT_INSIDE_TYPEOF, 1, 0)
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.LoadLookupGlobalSlot(name, TypeofMode::INSIDE_TYPEOF, 1, 0);
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// Emit closure operations.
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builder.CreateClosure(0, NOT_TENURED);
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// Emit create context operation.
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builder.CreateBlockContext(factory->NewScopeInfo(1));
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builder.CreateCatchContext(reg, name, factory->NewScopeInfo(1));
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builder.CreateFunctionContext(1);
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builder.CreateWithContext(reg, factory->NewScopeInfo(1));
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// Emit literal creation operations.
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builder.CreateRegExpLiteral(factory->NewStringFromStaticChars("a"), 0, 0)
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.CreateArrayLiteral(factory->NewFixedArray(1), 0, 0)
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.CreateObjectLiteral(factory->NewFixedArray(1), 0, 0, reg);
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// Call operations.
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builder.Call(reg, reg_list, 1, Call::GLOBAL_CALL)
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.Call(reg, reg_list, 1, Call::NAMED_PROPERTY_CALL,
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TailCallMode::kDisallow)
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.Call(reg, reg_list, 1, Call::GLOBAL_CALL, TailCallMode::kAllow)
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.CallRuntime(Runtime::kIsArray, reg)
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.CallRuntimeForPair(Runtime::kLoadLookupSlotForCall, reg_list, pair)
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.CallJSRuntime(Context::SPREAD_ITERABLE_INDEX, reg_list)
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.NewWithSpread(reg_list);
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// Emit binary operator invocations.
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builder.BinaryOperation(Token::Value::ADD, reg, 1)
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.BinaryOperation(Token::Value::SUB, reg, 2)
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.BinaryOperation(Token::Value::MUL, reg, 3)
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.BinaryOperation(Token::Value::DIV, reg, 4)
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.BinaryOperation(Token::Value::MOD, reg, 5);
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// Emit bitwise operator invocations
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builder.BinaryOperation(Token::Value::BIT_OR, reg, 6)
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.BinaryOperation(Token::Value::BIT_XOR, reg, 7)
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.BinaryOperation(Token::Value::BIT_AND, reg, 8);
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// Emit shift operator invocations
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builder.BinaryOperation(Token::Value::SHL, reg, 9)
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.BinaryOperation(Token::Value::SAR, reg, 10)
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.BinaryOperation(Token::Value::SHR, reg, 11);
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// Emit peephole optimizations of LdaSmi followed by binary operation.
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builder.LoadLiteral(Smi::FromInt(1))
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.BinaryOperation(Token::Value::ADD, reg, 1)
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.LoadLiteral(Smi::FromInt(2))
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.BinaryOperation(Token::Value::SUB, reg, 2)
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.LoadLiteral(Smi::FromInt(3))
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.BinaryOperation(Token::Value::BIT_AND, reg, 3)
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.LoadLiteral(Smi::FromInt(4))
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.BinaryOperation(Token::Value::BIT_OR, reg, 4)
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.LoadLiteral(Smi::FromInt(5))
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.BinaryOperation(Token::Value::SHL, reg, 5)
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.LoadLiteral(Smi::FromInt(6))
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.BinaryOperation(Token::Value::SAR, reg, 6);
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// Emit count operatior invocations
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builder.CountOperation(Token::Value::ADD, 1)
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.CountOperation(Token::Value::SUB, 1);
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// Emit unary operator invocations.
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builder
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.LogicalNot() // ToBooleanLogicalNot
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.LogicalNot() // non-ToBoolean LogicalNot
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.TypeOf();
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// Emit delete
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builder.Delete(reg, LanguageMode::SLOPPY).Delete(reg, LanguageMode::STRICT);
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// Emit new.
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builder.New(reg, reg_list, 1);
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// Emit test operator invocations.
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builder.CompareOperation(Token::Value::EQ, reg, 1)
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.CompareOperation(Token::Value::NE, reg, 2)
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.CompareOperation(Token::Value::EQ_STRICT, reg, 3)
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.CompareOperation(Token::Value::LT, reg, 4)
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.CompareOperation(Token::Value::GT, reg, 5)
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.CompareOperation(Token::Value::LTE, reg, 6)
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.CompareOperation(Token::Value::GTE, reg, 7)
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.CompareOperation(Token::Value::INSTANCEOF, reg, 8)
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.CompareOperation(Token::Value::IN, reg, 9);
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// Emit peephole optimizations of equality with Null or Undefined.
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builder.LoadUndefined()
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.CompareOperation(Token::Value::EQ, reg, 1)
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.LoadNull()
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.CompareOperation(Token::Value::EQ, reg, 1);
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// Emit conversion operator invocations.
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builder.ConvertAccumulatorToNumber(reg)
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.ConvertAccumulatorToObject(reg)
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.ConvertAccumulatorToName(reg);
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// Short jumps with Imm8 operands
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{
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BytecodeLabel start, after_jump1, after_jump2, after_jump3, after_jump4,
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after_jump5;
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builder.Bind(&start)
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.Jump(&after_jump1)
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.Bind(&after_jump1)
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.JumpIfNull(&after_jump2)
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.Bind(&after_jump2)
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.JumpIfUndefined(&after_jump3)
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.Bind(&after_jump3)
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.JumpIfNotHole(&after_jump4)
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.Bind(&after_jump4)
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.JumpIfJSReceiver(&after_jump5)
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.Bind(&after_jump5)
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.JumpLoop(&start, 0);
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}
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// Longer jumps with constant operands
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BytecodeLabel end[9];
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{
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BytecodeLabel after_jump;
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builder.Jump(&end[0])
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.Bind(&after_jump)
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.LoadTrue()
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.JumpIfTrue(&end[1])
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.LoadTrue()
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.JumpIfFalse(&end[2])
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.LoadLiteral(Smi::kZero)
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.JumpIfTrue(&end[3])
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.LoadLiteral(Smi::kZero)
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.JumpIfFalse(&end[4])
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.JumpIfNull(&end[5])
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.JumpIfUndefined(&end[6])
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.JumpIfNotHole(&end[7])
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.LoadLiteral(factory->prototype_string())
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.JumpIfJSReceiver(&end[8]);
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}
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// Perform an operation that returns boolean value to
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// generate JumpIfTrue/False
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{
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BytecodeLabel after_jump1, after_jump2;
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builder.CompareOperation(Token::Value::EQ, reg, 1)
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.JumpIfTrue(&after_jump1)
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.Bind(&after_jump1)
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.CompareOperation(Token::Value::EQ, reg, 2)
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.JumpIfFalse(&after_jump2)
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.Bind(&after_jump2);
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}
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// Perform an operation that returns a non-boolean operation to
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// generate JumpIfToBooleanTrue/False.
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{
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BytecodeLabel after_jump1, after_jump2;
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builder.BinaryOperation(Token::Value::ADD, reg, 1)
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.JumpIfTrue(&after_jump1)
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.Bind(&after_jump1)
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.BinaryOperation(Token::Value::ADD, reg, 2)
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.JumpIfFalse(&after_jump2)
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.Bind(&after_jump2);
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}
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// Emit set pending message bytecode.
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builder.SetPendingMessage();
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// Emit stack check bytecode.
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builder.StackCheck(0);
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// Emit throw and re-throw in it's own basic block so that the rest of the
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// code isn't omitted due to being dead.
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BytecodeLabel after_throw;
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builder.Throw().Bind(&after_throw);
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BytecodeLabel after_rethrow;
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builder.ReThrow().Bind(&after_rethrow);
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builder.ForInPrepare(reg, triple)
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.ForInContinue(reg, reg)
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.ForInNext(reg, reg, pair, 1)
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.ForInStep(reg);
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// Wide constant pool loads
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for (int i = 0; i < 256; i++) {
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// Emit junk in constant pool to force wide constant pool index.
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builder.LoadLiteral(factory->NewNumber(2.5321 + i));
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}
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builder.LoadLiteral(Smi::FromInt(20000000));
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Handle<String> wide_name = factory->NewStringFromStaticChars("var_wide_name");
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// Emit wide global load / store operations.
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builder.LoadGlobal(name, 1024, TypeofMode::NOT_INSIDE_TYPEOF)
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.LoadGlobal(name, 1024, TypeofMode::INSIDE_TYPEOF)
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.LoadGlobal(name, 1024, TypeofMode::INSIDE_TYPEOF)
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.StoreGlobal(name, 1024, LanguageMode::SLOPPY)
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.StoreGlobal(wide_name, 1, LanguageMode::STRICT);
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// Emit extra wide global load.
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builder.LoadGlobal(name, 1024 * 1024, TypeofMode::NOT_INSIDE_TYPEOF);
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// Emit wide load / store property operations.
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builder.LoadNamedProperty(reg, wide_name, 0)
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.LoadKeyedProperty(reg, 2056)
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.StoreNamedProperty(reg, wide_name, 0, LanguageMode::SLOPPY)
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.StoreKeyedProperty(reg, reg, 2056, LanguageMode::SLOPPY)
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.StoreNamedProperty(reg, wide_name, 0, LanguageMode::STRICT)
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.StoreKeyedProperty(reg, reg, 2056, LanguageMode::STRICT);
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builder.StoreDataPropertyInLiteral(reg, reg, reg, reg);
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// Emit wide context operations.
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builder.LoadContextSlot(reg, 1024, 0).StoreContextSlot(reg, 1024, 0);
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// Emit wide load / store lookup slots.
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builder.LoadLookupSlot(wide_name, TypeofMode::NOT_INSIDE_TYPEOF)
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.LoadLookupSlot(wide_name, TypeofMode::INSIDE_TYPEOF)
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.StoreLookupSlot(wide_name, LanguageMode::SLOPPY)
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.StoreLookupSlot(wide_name, LanguageMode::STRICT);
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// CreateClosureWide
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builder.CreateClosure(1000, NOT_TENURED);
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// Emit wide variant of literal creation operations.
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builder.CreateRegExpLiteral(factory->NewStringFromStaticChars("wide_literal"),
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0, 0)
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.CreateArrayLiteral(factory->NewFixedArray(2), 0, 0)
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.CreateObjectLiteral(factory->NewFixedArray(2), 0, 0, reg);
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// Emit load and store operations for module variables.
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builder.LoadModuleVariable(-1, 42)
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.LoadModuleVariable(0, 42)
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.LoadModuleVariable(1, 42)
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.StoreModuleVariable(-1, 42)
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.StoreModuleVariable(0, 42)
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.StoreModuleVariable(1, 42);
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// Emit generator operations.
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builder.SuspendGenerator(reg)
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.ResumeGenerator(reg);
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// Intrinsics handled by the interpreter.
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builder.CallRuntime(Runtime::kInlineIsArray, reg_list);
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// Emit debugger bytecode.
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builder.Debugger();
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// Insert dummy ops to force longer jumps.
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for (int i = 0; i < 128; i++) {
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builder.LoadTrue();
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}
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// Bind labels for long jumps at the very end.
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for (size_t i = 0; i < arraysize(end); i++) {
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builder.Bind(&end[i]);
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}
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// Return must be the last instruction.
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builder.Return();
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// Generate BytecodeArray.
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Handle<BytecodeArray> the_array = builder.ToBytecodeArray(isolate());
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CHECK_EQ(the_array->frame_size(),
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builder.total_register_count() * kPointerSize);
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// Build scorecard of bytecodes encountered in the BytecodeArray.
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std::vector<int> scorecard(Bytecodes::ToByte(Bytecode::kLast) + 1);
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Bytecode final_bytecode = Bytecode::kLdaZero;
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int i = 0;
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while (i < the_array->length()) {
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uint8_t code = the_array->get(i);
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scorecard[code] += 1;
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final_bytecode = Bytecodes::FromByte(code);
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OperandScale operand_scale = OperandScale::kSingle;
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int prefix_offset = 0;
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if (Bytecodes::IsPrefixScalingBytecode(final_bytecode)) {
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operand_scale = Bytecodes::PrefixBytecodeToOperandScale(final_bytecode);
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prefix_offset = 1;
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code = the_array->get(i + 1);
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final_bytecode = Bytecodes::FromByte(code);
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}
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i += prefix_offset + Bytecodes::Size(final_bytecode, operand_scale);
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}
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// Insert entry for illegal bytecode as this is never willingly emitted.
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scorecard[Bytecodes::ToByte(Bytecode::kIllegal)] = 1;
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// Insert entry for nop bytecode as this often gets optimized out.
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scorecard[Bytecodes::ToByte(Bytecode::kNop)] = 1;
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if (!FLAG_ignition_peephole) {
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// Insert entries for bytecodes only emitted by peephole optimizer.
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scorecard[Bytecodes::ToByte(Bytecode::kLogicalNot)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kJump)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kJumpIfTrue)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kJumpIfFalse)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kJumpIfTrueConstant)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kJumpIfFalseConstant)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kAddSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kSubSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kBitwiseAndSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kBitwiseOrSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kShiftLeftSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kShiftRightSmi)] = 1;
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scorecard[Bytecodes::ToByte(Bytecode::kTestUndetectable)] = 1;
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}
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// Check return occurs at the end and only once in the BytecodeArray.
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CHECK_EQ(final_bytecode, Bytecode::kReturn);
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CHECK_EQ(scorecard[Bytecodes::ToByte(final_bytecode)], 1);
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#define CHECK_BYTECODE_PRESENT(Name, ...) \
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/* Check Bytecode is marked in scorecard, unless it's a debug break */ \
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if (!Bytecodes::IsDebugBreak(Bytecode::k##Name)) { \
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CHECK_GE(scorecard[Bytecodes::ToByte(Bytecode::k##Name)], 1); \
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}
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BYTECODE_LIST(CHECK_BYTECODE_PRESENT)
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#undef CHECK_BYTECODE_PRESENT
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}
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TEST_F(BytecodeArrayBuilderTest, FrameSizesLookGood) {
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CanonicalHandleScope canonical(isolate());
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for (int locals = 0; locals < 5; locals++) {
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for (int contexts = 0; contexts < 4; contexts++) {
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for (int temps = 0; temps < 3; temps++) {
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BytecodeArrayBuilder builder(isolate(), zone(), 0, contexts, locals);
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BytecodeRegisterAllocator* allocator(builder.register_allocator());
|
|
for (int i = 0; i < locals + contexts; i++) {
|
|
builder.LoadLiteral(Smi::kZero);
|
|
builder.StoreAccumulatorInRegister(Register(i));
|
|
}
|
|
for (int i = 0; i < temps; i++) {
|
|
Register temp = allocator->NewRegister();
|
|
builder.LoadLiteral(Smi::kZero);
|
|
builder.StoreAccumulatorInRegister(temp);
|
|
// Ensure temporaries are used so not optimized away by the
|
|
// register optimizer.
|
|
builder.ConvertAccumulatorToName(temp);
|
|
}
|
|
builder.Return();
|
|
|
|
Handle<BytecodeArray> the_array = builder.ToBytecodeArray(isolate());
|
|
int total_registers = locals + contexts + temps;
|
|
CHECK_EQ(the_array->frame_size(), total_registers * kPointerSize);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, RegisterValues) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
int index = 1;
|
|
|
|
Register the_register(index);
|
|
CHECK_EQ(the_register.index(), index);
|
|
|
|
int actual_operand = the_register.ToOperand();
|
|
int actual_index = Register::FromOperand(actual_operand).index();
|
|
CHECK_EQ(actual_index, index);
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, Parameters) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 10, 0, 0);
|
|
|
|
Register param0(builder.Parameter(0));
|
|
Register param9(builder.Parameter(9));
|
|
CHECK_EQ(param9.index() - param0.index(), 9);
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, Constants) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 0, 0, 0);
|
|
|
|
Factory* factory = isolate()->factory();
|
|
Handle<HeapObject> heap_num_1 = factory->NewHeapNumber(3.14);
|
|
Handle<HeapObject> heap_num_2 = factory->NewHeapNumber(5.2);
|
|
Handle<Object> large_smi(Smi::FromInt(0x12345678), isolate());
|
|
Handle<HeapObject> heap_num_2_copy(*heap_num_2);
|
|
builder.LoadLiteral(heap_num_1)
|
|
.LoadLiteral(heap_num_2)
|
|
.LoadLiteral(large_smi)
|
|
.LoadLiteral(heap_num_1)
|
|
.LoadLiteral(heap_num_1)
|
|
.LoadLiteral(heap_num_2_copy)
|
|
.Return();
|
|
|
|
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
|
|
// Should only have one entry for each identical constant.
|
|
CHECK_EQ(array->constant_pool()->length(), 3);
|
|
}
|
|
|
|
static Bytecode PeepholeToBoolean(Bytecode jump_bytecode) {
|
|
return FLAG_ignition_peephole
|
|
? Bytecodes::GetJumpWithoutToBoolean(jump_bytecode)
|
|
: jump_bytecode;
|
|
}
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, ForwardJumps) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
static const int kFarJumpDistance = 256;
|
|
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 0, 0, 1);
|
|
|
|
Register reg(0);
|
|
BytecodeLabel far0, far1, far2, far3, far4;
|
|
BytecodeLabel near0, near1, near2, near3, near4;
|
|
BytecodeLabel after_jump0, after_jump1;
|
|
|
|
builder.Jump(&near0)
|
|
.Bind(&after_jump0)
|
|
.CompareOperation(Token::Value::EQ, reg, 1)
|
|
.JumpIfTrue(&near1)
|
|
.CompareOperation(Token::Value::EQ, reg, 2)
|
|
.JumpIfFalse(&near2)
|
|
.BinaryOperation(Token::Value::ADD, reg, 1)
|
|
.JumpIfTrue(&near3)
|
|
.BinaryOperation(Token::Value::ADD, reg, 2)
|
|
.JumpIfFalse(&near4)
|
|
.Bind(&near0)
|
|
.Bind(&near1)
|
|
.Bind(&near2)
|
|
.Bind(&near3)
|
|
.Bind(&near4)
|
|
.Jump(&far0)
|
|
.Bind(&after_jump1)
|
|
.CompareOperation(Token::Value::EQ, reg, 3)
|
|
.JumpIfTrue(&far1)
|
|
.CompareOperation(Token::Value::EQ, reg, 4)
|
|
.JumpIfFalse(&far2)
|
|
.BinaryOperation(Token::Value::ADD, reg, 3)
|
|
.JumpIfTrue(&far3)
|
|
.BinaryOperation(Token::Value::ADD, reg, 4)
|
|
.JumpIfFalse(&far4);
|
|
for (int i = 0; i < kFarJumpDistance - 22; i++) {
|
|
builder.Debugger();
|
|
}
|
|
builder.Bind(&far0).Bind(&far1).Bind(&far2).Bind(&far3).Bind(&far4);
|
|
builder.Return();
|
|
|
|
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
|
|
DCHECK_EQ(array->length(), 44 + kFarJumpDistance - 22 + 1);
|
|
|
|
BytecodeArrayIterator iterator(array);
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 22);
|
|
iterator.Advance();
|
|
|
|
// Ignore compare operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(),
|
|
PeepholeToBoolean(Bytecode::kJumpIfToBooleanTrue));
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 17);
|
|
iterator.Advance();
|
|
|
|
// Ignore compare operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(),
|
|
PeepholeToBoolean(Bytecode::kJumpIfToBooleanFalse));
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 12);
|
|
iterator.Advance();
|
|
|
|
// Ignore add operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 7);
|
|
iterator.Advance();
|
|
|
|
// Ignore add operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpConstant);
|
|
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
|
|
Smi::FromInt(kFarJumpDistance));
|
|
iterator.Advance();
|
|
|
|
// Ignore compare operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(),
|
|
PeepholeToBoolean(Bytecode::kJumpIfToBooleanTrueConstant));
|
|
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
|
|
Smi::FromInt(kFarJumpDistance - 5));
|
|
iterator.Advance();
|
|
|
|
// Ignore compare operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(),
|
|
PeepholeToBoolean(Bytecode::kJumpIfToBooleanFalseConstant));
|
|
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
|
|
Smi::FromInt(kFarJumpDistance - 10));
|
|
iterator.Advance();
|
|
|
|
// Ignore add operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrueConstant);
|
|
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
|
|
Smi::FromInt(kFarJumpDistance - 15));
|
|
iterator.Advance();
|
|
|
|
// Ignore add operation.
|
|
iterator.Advance();
|
|
|
|
CHECK_EQ(iterator.current_bytecode(),
|
|
Bytecode::kJumpIfToBooleanFalseConstant);
|
|
CHECK_EQ(*iterator.GetConstantForIndexOperand(0),
|
|
Smi::FromInt(kFarJumpDistance - 20));
|
|
iterator.Advance();
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, BackwardJumps) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 0, 0, 1);
|
|
|
|
Register reg(0);
|
|
|
|
BytecodeLabel label0;
|
|
builder.Bind(&label0).JumpLoop(&label0, 0);
|
|
for (int i = 0; i < 42; i++) {
|
|
BytecodeLabel after_jump;
|
|
builder.JumpLoop(&label0, 0).Bind(&after_jump);
|
|
}
|
|
|
|
// Add padding to force wide backwards jumps.
|
|
for (int i = 0; i < 256; i++) {
|
|
builder.Debugger();
|
|
}
|
|
|
|
builder.JumpLoop(&label0, 0);
|
|
BytecodeLabel end;
|
|
builder.Bind(&end);
|
|
builder.Return();
|
|
|
|
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
|
|
BytecodeArrayIterator iterator(array);
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
|
|
iterator.Advance();
|
|
for (int i = 0; i < 42; i++) {
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
|
|
// offset of 3 (because kJumpLoop takes two immediate operands)
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), -i * 3 - 3);
|
|
iterator.Advance();
|
|
}
|
|
// Check padding to force wide backwards jumps.
|
|
for (int i = 0; i < 256; i++) {
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kDebugger);
|
|
iterator.Advance();
|
|
}
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), -386);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
|
|
iterator.Advance();
|
|
CHECK(iterator.done());
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, LabelReuse) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 0, 0, 0);
|
|
|
|
// Labels can only have 1 forward reference, but
|
|
// can be referred to mulitple times once bound.
|
|
BytecodeLabel label, after_jump0, after_jump1;
|
|
|
|
builder.Jump(&label)
|
|
.Bind(&label)
|
|
.JumpLoop(&label, 0)
|
|
.Bind(&after_jump0)
|
|
.JumpLoop(&label, 0)
|
|
.Bind(&after_jump1)
|
|
.Return();
|
|
|
|
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
|
|
BytecodeArrayIterator iterator(array);
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), -3);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
|
|
iterator.Advance();
|
|
CHECK(iterator.done());
|
|
}
|
|
|
|
|
|
TEST_F(BytecodeArrayBuilderTest, LabelAddressReuse) {
|
|
CanonicalHandleScope canonical(isolate());
|
|
static const int kRepeats = 3;
|
|
|
|
BytecodeArrayBuilder builder(isolate(), zone(), 0, 0, 0);
|
|
for (int i = 0; i < kRepeats; i++) {
|
|
BytecodeLabel label, after_jump0, after_jump1;
|
|
builder.Jump(&label)
|
|
.Bind(&label)
|
|
.JumpLoop(&label, 0)
|
|
.Bind(&after_jump0)
|
|
.JumpLoop(&label, 0)
|
|
.Bind(&after_jump1);
|
|
}
|
|
builder.Return();
|
|
|
|
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
|
|
BytecodeArrayIterator iterator(array);
|
|
for (int i = 0; i < kRepeats; i++) {
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJump);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 2);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), 0);
|
|
iterator.Advance();
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
|
|
CHECK_EQ(iterator.GetImmediateOperand(0), -3);
|
|
iterator.Advance();
|
|
}
|
|
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
|
|
iterator.Advance();
|
|
CHECK(iterator.done());
|
|
}
|
|
|
|
} // namespace interpreter
|
|
} // namespace internal
|
|
} // namespace v8
|