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v8/test/unittests/interpreter/bytecode-array-builder-unittest.cc
Caitlin Potter b6f7ea5805 [runtime] use new CloneObject bytecode for some ObjectLiteralSpread cases 
As discussed in
https://docs.google.com/document/d/1sBdGe8RHgeYP850cKSSgGABTyfMdvaEWLy-vertuTCo/edit?ts=5b3ba5cc#,

this CL introduces a new bytecode (CloneObject), and a new IC type.

In this prototype implementation, the type feedback looks like the
following:

Uninitialized case:
  { uninitialized_sentinel, uninitialized_sentinel }
Monomorphic case:
  { weak 'source' map, strong 'result' map }
Polymorphic case:
  { WeakFixedArray with { weak 'source' map, strong 'result' map }, cleared value }
Megamorphic case:
  { megamorphic_sentinel, cleared_Value }

In the fast case, Object cloning is done by allocating an object with
the saved result map, and a shallow clone of the fast properties from
the source object, as well as cloned fast elements from the source object.
If at any point the fast case can't be taken, the IC transitions to the
slow case and remains there.

This prototype CL does not include any TurboFan optimization, and the
CloneObject operation is merely reduced to a stub call.

It may still be possible to get some further improvements by somehow
incorporating compile-time boilerplate elements into the cloned object,
or simplifying how the boilerplate elements are inserted into the
object.

In terms of performance, we improve the ObjectSpread score in JSTests/ObjectLiteralSpread/
by about 8x, with substantial improvements over the Babel and ObjectAssign scores.

R=gsathya@chromium.org, mvstanton@chromium.org, rmcilroy@chromium.org, neis@chromium.org, bmeurer@chromium.org
BUG=v8:7611

Change-Id: I79e1796eb77016fb4feba0e1d3bb9abb348c183e
Reviewed-on: https://chromium-review.googlesource.com/1127472
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54595}
2018-07-20 16:48:59 +00:00

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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits>
#include "src/v8.h"
#include "src/ast/scopes.h"
#include "src/interpreter/bytecode-array-builder.h"
#include "src/interpreter/bytecode-array-iterator.h"
#include "src/interpreter/bytecode-jump-table.h"
#include "src/interpreter/bytecode-label.h"
#include "src/interpreter/bytecode-register-allocator.h"
#include "src/objects-inl.h"
#include "test/unittests/interpreter/bytecode-utils.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodeArrayBuilderTest : public TestWithIsolateAndZone {
public:
BytecodeArrayBuilderTest() {}
~BytecodeArrayBuilderTest() override {}
};
using ToBooleanMode = BytecodeArrayBuilder::ToBooleanMode;
TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
FeedbackVectorSpec feedback_spec(zone());
BytecodeArrayBuilder builder(zone(), 1, 131, &feedback_spec);
Factory* factory = isolate()->factory();
AstValueFactory ast_factory(zone(), isolate()->ast_string_constants(),
isolate()->heap()->HashSeed());
DeclarationScope scope(zone(), &ast_factory);
CHECK_EQ(builder.locals_count(), 131);
CHECK_EQ(builder.fixed_register_count(), 131);
Register reg(0);
Register other(reg.index() + 1);
Register wide(128);
RegisterList empty;
RegisterList single = BytecodeUtils::NewRegisterList(0, 1);
RegisterList pair = BytecodeUtils::NewRegisterList(0, 2);
RegisterList triple = BytecodeUtils::NewRegisterList(0, 3);
RegisterList reg_list = BytecodeUtils::NewRegisterList(0, 10);
// Emit argument creation operations.
builder.CreateArguments(CreateArgumentsType::kMappedArguments)
.CreateArguments(CreateArgumentsType::kUnmappedArguments)
.CreateArguments(CreateArgumentsType::kRestParameter);
// Emit constant loads.
builder.LoadLiteral(Smi::kZero)
.StoreAccumulatorInRegister(reg)
.LoadLiteral(Smi::FromInt(8))
.CompareOperation(Token::Value::EQ, reg,
1) // Prevent peephole optimization
// LdaSmi, Star -> LdrSmi.
.StoreAccumulatorInRegister(reg)
.LoadLiteral(Smi::FromInt(10000000))
.StoreAccumulatorInRegister(reg)
.LoadLiteral(ast_factory.GetOneByteString("A constant"))
.StoreAccumulatorInRegister(reg)
.LoadUndefined()
.StoreAccumulatorInRegister(reg)
.LoadNull()
.StoreAccumulatorInRegister(reg)
.LoadTheHole()
.StoreAccumulatorInRegister(reg)
.LoadTrue()
.StoreAccumulatorInRegister(reg)
.LoadFalse()
.StoreAccumulatorInRegister(wide);
// Emit Ldar and Star taking care to foil the register optimizer.
builder.StackCheck(0)
.LoadAccumulatorWithRegister(other)
.BinaryOperation(Token::ADD, reg, 1)
.StoreAccumulatorInRegister(reg)
.LoadNull();
// Emit register-register transfer.
builder.MoveRegister(reg, other);
builder.MoveRegister(reg, wide);
FeedbackSlot load_global_slot =
feedback_spec.AddLoadGlobalICSlot(NOT_INSIDE_TYPEOF);
FeedbackSlot load_global_typeof_slot =
feedback_spec.AddLoadGlobalICSlot(INSIDE_TYPEOF);
FeedbackSlot sloppy_store_global_slot =
feedback_spec.AddStoreGlobalICSlot(LanguageMode::kSloppy);
FeedbackSlot load_slot = feedback_spec.AddLoadICSlot();
FeedbackSlot keyed_load_slot = feedback_spec.AddKeyedLoadICSlot();
FeedbackSlot sloppy_store_slot =
feedback_spec.AddStoreICSlot(LanguageMode::kSloppy);
FeedbackSlot strict_store_slot =
feedback_spec.AddStoreICSlot(LanguageMode::kStrict);
FeedbackSlot sloppy_keyed_store_slot =
feedback_spec.AddKeyedStoreICSlot(LanguageMode::kSloppy);
FeedbackSlot strict_keyed_store_slot =
feedback_spec.AddKeyedStoreICSlot(LanguageMode::kStrict);
FeedbackSlot store_own_slot = feedback_spec.AddStoreOwnICSlot();
FeedbackSlot store_array_element_slot =
feedback_spec.AddStoreInArrayLiteralICSlot();
// Emit global load / store operations.
const AstRawString* name = ast_factory.GetOneByteString("var_name");
builder
.LoadGlobal(name, load_global_slot.ToInt(), TypeofMode::NOT_INSIDE_TYPEOF)
.LoadGlobal(name, load_global_typeof_slot.ToInt(),
TypeofMode::INSIDE_TYPEOF)
.StoreGlobal(name, sloppy_store_global_slot.ToInt());
// Emit context operations.
builder.PushContext(reg)
.PopContext(reg)
.LoadContextSlot(reg, 1, 0, BytecodeArrayBuilder::kMutableSlot)
.StoreContextSlot(reg, 1, 0)
.LoadContextSlot(reg, 2, 0, BytecodeArrayBuilder::kImmutableSlot)
.StoreContextSlot(reg, 3, 0);
// Emit context operations which operate on the local context.
builder
.LoadContextSlot(Register::current_context(), 1, 0,
BytecodeArrayBuilder::kMutableSlot)
.StoreContextSlot(Register::current_context(), 1, 0)
.LoadContextSlot(Register::current_context(), 2, 0,
BytecodeArrayBuilder::kImmutableSlot)
.StoreContextSlot(Register::current_context(), 3, 0);
// Emit load / store property operations.
builder.LoadNamedProperty(reg, name, load_slot.ToInt())
.LoadKeyedProperty(reg, keyed_load_slot.ToInt())
.StoreNamedProperty(reg, name, sloppy_store_slot.ToInt(),
LanguageMode::kSloppy)
.StoreKeyedProperty(reg, reg, sloppy_keyed_store_slot.ToInt(),
LanguageMode::kSloppy)
.StoreNamedProperty(reg, name, strict_store_slot.ToInt(),
LanguageMode::kStrict)
.StoreKeyedProperty(reg, reg, strict_keyed_store_slot.ToInt(),
LanguageMode::kStrict)
.StoreNamedOwnProperty(reg, name, store_own_slot.ToInt())
.StoreInArrayLiteral(reg, reg, store_array_element_slot.ToInt());
// Emit load / store lookup slots.
builder.LoadLookupSlot(name, TypeofMode::NOT_INSIDE_TYPEOF)
.LoadLookupSlot(name, TypeofMode::INSIDE_TYPEOF)
.StoreLookupSlot(name, LanguageMode::kSloppy, LookupHoistingMode::kNormal)
.StoreLookupSlot(name, LanguageMode::kSloppy,
LookupHoistingMode::kLegacySloppy)
.StoreLookupSlot(name, LanguageMode::kStrict,
LookupHoistingMode::kNormal);
// Emit load / store lookup slots with context fast paths.
builder.LoadLookupContextSlot(name, TypeofMode::NOT_INSIDE_TYPEOF, 1, 0)
.LoadLookupContextSlot(name, TypeofMode::INSIDE_TYPEOF, 1, 0);
// Emit load / store lookup slots with global fast paths.
builder.LoadLookupGlobalSlot(name, TypeofMode::NOT_INSIDE_TYPEOF, 1, 0)
.LoadLookupGlobalSlot(name, TypeofMode::INSIDE_TYPEOF, 1, 0);
// Emit closure operations.
builder.CreateClosure(0, 1, NOT_TENURED);
// Emit create context operation.
builder.CreateBlockContext(&scope);
builder.CreateCatchContext(reg, &scope);
builder.CreateFunctionContext(&scope, 1);
builder.CreateEvalContext(&scope, 1);
builder.CreateWithContext(reg, &scope);
// Emit literal creation operations.
builder.CreateRegExpLiteral(ast_factory.GetOneByteString("a"), 0, 0);
builder.CreateArrayLiteral(0, 0, 0);
builder.CreateObjectLiteral(0, 0, 0, reg);
// Emit tagged template operations.
builder.GetTemplateObject(0, 0);
// Call operations.
builder.CallAnyReceiver(reg, reg_list, 1)
.CallProperty(reg, reg_list, 1)
.CallProperty(reg, single, 1)
.CallProperty(reg, pair, 1)
.CallProperty(reg, triple, 1)
.CallUndefinedReceiver(reg, reg_list, 1)
.CallUndefinedReceiver(reg, empty, 1)
.CallUndefinedReceiver(reg, single, 1)
.CallUndefinedReceiver(reg, pair, 1)
.CallRuntime(Runtime::kIsArray, reg)
.CallRuntimeForPair(Runtime::kLoadLookupSlotForCall, reg_list, pair)
.CallJSRuntime(Context::OBJECT_CREATE, reg_list)
.CallWithSpread(reg, reg_list, 1);
// Emit binary operator invocations.
builder.BinaryOperation(Token::Value::ADD, reg, 1)
.BinaryOperation(Token::Value::SUB, reg, 2)
.BinaryOperation(Token::Value::MUL, reg, 3)
.BinaryOperation(Token::Value::DIV, reg, 4)
.BinaryOperation(Token::Value::MOD, reg, 5)
.BinaryOperation(Token::Value::EXP, reg, 6);
// Emit bitwise operator invocations
builder.BinaryOperation(Token::Value::BIT_OR, reg, 6)
.BinaryOperation(Token::Value::BIT_XOR, reg, 7)
.BinaryOperation(Token::Value::BIT_AND, reg, 8);
// Emit shift operator invocations
builder.BinaryOperation(Token::Value::SHL, reg, 9)
.BinaryOperation(Token::Value::SAR, reg, 10)
.BinaryOperation(Token::Value::SHR, reg, 11);
// Emit Smi binary operations.
builder.BinaryOperationSmiLiteral(Token::Value::ADD, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::SUB, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::MUL, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::DIV, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::MOD, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::EXP, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::BIT_OR, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::BIT_XOR, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::BIT_AND, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::SHL, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::SAR, Smi::FromInt(42), 2)
.BinaryOperationSmiLiteral(Token::Value::SHR, Smi::FromInt(42), 2);
// Emit unary and count operator invocations.
builder.UnaryOperation(Token::Value::INC, 1)
.UnaryOperation(Token::Value::DEC, 1)
.UnaryOperation(Token::Value::ADD, 1)
.UnaryOperation(Token::Value::SUB, 1)
.UnaryOperation(Token::Value::BIT_NOT, 1);
// Emit unary operator invocations.
builder.LogicalNot(ToBooleanMode::kConvertToBoolean)
.LogicalNot(ToBooleanMode::kAlreadyBoolean)
.TypeOf();
// Emit delete
builder.Delete(reg, LanguageMode::kSloppy).Delete(reg, LanguageMode::kStrict);
// Emit construct.
builder.Construct(reg, reg_list, 1).ConstructWithSpread(reg, reg_list, 1);
// Emit test operator invocations.
builder.CompareOperation(Token::Value::EQ, reg, 1)
.CompareOperation(Token::Value::EQ_STRICT, reg, 2)
.CompareOperation(Token::Value::LT, reg, 3)
.CompareOperation(Token::Value::GT, reg, 4)
.CompareOperation(Token::Value::LTE, reg, 5)
.CompareOperation(Token::Value::GTE, reg, 6)
.CompareTypeOf(TestTypeOfFlags::LiteralFlag::kNumber)
.CompareOperation(Token::Value::INSTANCEOF, reg, 7)
.CompareOperation(Token::Value::IN, reg)
.CompareReference(reg)
.CompareUndetectable()
.CompareUndefined()
.CompareNull();
// Emit conversion operator invocations.
builder.ToNumber(1).ToNumeric(1).ToObject(reg).ToName(reg).ToString();
// Emit GetSuperConstructor.
builder.GetSuperConstructor(reg);
// Hole checks.
builder.ThrowReferenceErrorIfHole(name)
.ThrowSuperAlreadyCalledIfNotHole()
.ThrowSuperNotCalledIfHole();
// Short jumps with Imm8 operands
{
BytecodeLabel start, after_jump1, after_jump2, after_jump3, after_jump4,
after_jump5, after_jump6, after_jump7, after_jump8, after_jump9,
after_jump10;
builder.Bind(&start)
.Jump(&after_jump1)
.Bind(&after_jump1)
.JumpIfNull(&after_jump2)
.Bind(&after_jump2)
.JumpIfNotNull(&after_jump3)
.Bind(&after_jump3)
.JumpIfUndefined(&after_jump4)
.Bind(&after_jump4)
.JumpIfNotUndefined(&after_jump5)
.Bind(&after_jump5)
.JumpIfJSReceiver(&after_jump6)
.Bind(&after_jump6)
.JumpIfTrue(ToBooleanMode::kConvertToBoolean, &after_jump7)
.Bind(&after_jump7)
.JumpIfTrue(ToBooleanMode::kAlreadyBoolean, &after_jump8)
.Bind(&after_jump8)
.JumpIfFalse(ToBooleanMode::kConvertToBoolean, &after_jump9)
.Bind(&after_jump9)
.JumpIfFalse(ToBooleanMode::kAlreadyBoolean, &after_jump10)
.Bind(&after_jump10)
.JumpLoop(&start, 0);
}
// Longer jumps with constant operands
BytecodeLabel end[10];
{
BytecodeLabel after_jump;
builder.Jump(&end[0])
.Bind(&after_jump)
.JumpIfTrue(ToBooleanMode::kConvertToBoolean, &end[1])
.JumpIfTrue(ToBooleanMode::kAlreadyBoolean, &end[2])
.JumpIfFalse(ToBooleanMode::kConvertToBoolean, &end[3])
.JumpIfFalse(ToBooleanMode::kAlreadyBoolean, &end[4])
.JumpIfNull(&end[5])
.JumpIfNotNull(&end[6])
.JumpIfUndefined(&end[7])
.JumpIfNotUndefined(&end[8])
.LoadLiteral(ast_factory.prototype_string())
.JumpIfJSReceiver(&end[9]);
}
// Emit Smi table switch bytecode.
BytecodeJumpTable* jump_table = builder.AllocateJumpTable(1, 0);
builder.SwitchOnSmiNoFeedback(jump_table).Bind(jump_table, 0);
// Emit set pending message bytecode.
builder.SetPendingMessage();
// Emit stack check bytecode.
builder.StackCheck(0);
// Emit throw and re-throw in it's own basic block so that the rest of the
// code isn't omitted due to being dead.
BytecodeLabel after_throw;
builder.Throw().Bind(&after_throw);
BytecodeLabel after_rethrow;
builder.ReThrow().Bind(&after_rethrow);
builder.ForInEnumerate(reg)
.ForInPrepare(triple, 1)
.ForInContinue(reg, reg)
.ForInNext(reg, reg, pair, 1)
.ForInStep(reg);
// Wide constant pool loads
for (int i = 0; i < 256; i++) {
// Emit junk in constant pool to force wide constant pool index.
builder.LoadLiteral(2.5321 + i);
}
builder.LoadLiteral(Smi::FromInt(20000000));
const AstRawString* wide_name = ast_factory.GetOneByteString("var_wide_name");
builder.StoreDataPropertyInLiteral(reg, reg,
DataPropertyInLiteralFlag::kNoFlags, 0);
// Emit wide context operations.
builder.LoadContextSlot(reg, 1024, 0, BytecodeArrayBuilder::kMutableSlot)
.StoreContextSlot(reg, 1024, 0);
// Emit wide load / store lookup slots.
builder.LoadLookupSlot(wide_name, TypeofMode::NOT_INSIDE_TYPEOF)
.LoadLookupSlot(wide_name, TypeofMode::INSIDE_TYPEOF)
.StoreLookupSlot(wide_name, LanguageMode::kSloppy,
LookupHoistingMode::kNormal)
.StoreLookupSlot(wide_name, LanguageMode::kSloppy,
LookupHoistingMode::kLegacySloppy)
.StoreLookupSlot(wide_name, LanguageMode::kStrict,
LookupHoistingMode::kNormal);
// CreateClosureWide
builder.CreateClosure(1000, 321, NOT_TENURED);
// Emit wide variant of literal creation operations.
builder
.CreateRegExpLiteral(ast_factory.GetOneByteString("wide_literal"), 0, 0)
.CreateArrayLiteral(0, 0, 0)
.CreateEmptyArrayLiteral(0)
.CreateObjectLiteral(0, 0, 0, reg)
.CreateEmptyObjectLiteral()
.CloneObject(reg, 0, 0);
// Emit load and store operations for module variables.
builder.LoadModuleVariable(-1, 42)
.LoadModuleVariable(0, 42)
.LoadModuleVariable(1, 42)
.StoreModuleVariable(-1, 42)
.StoreModuleVariable(0, 42)
.StoreModuleVariable(1, 42);
// Emit generator operations.
{
// We have to skip over suspend because it returns and marks the remaining
// bytecode dead.
BytecodeLabel after_suspend;
builder.JumpIfTrue(ToBooleanMode::kAlreadyBoolean, &after_suspend)
.SuspendGenerator(reg, reg_list, 0)
.Bind(&after_suspend)
.ResumeGenerator(reg, reg_list);
}
BytecodeJumpTable* gen_jump_table = builder.AllocateJumpTable(1, 0);
builder.SwitchOnGeneratorState(reg, gen_jump_table).Bind(gen_jump_table, 0);
// Intrinsics handled by the interpreter.
builder.CallRuntime(Runtime::kInlineIsArray, reg_list);
// Emit debugger bytecode.
builder.Debugger();
// Emit abort bytecode.
{
BytecodeLabel after;
builder.Abort(AbortReason::kOperandIsASmi).Bind(&after);
}
// Insert dummy ops to force longer jumps.
for (int i = 0; i < 256; i++) {
builder.Debugger();
}
// Emit block counter increments.
builder.IncBlockCounter(0);
// Bind labels for long jumps at the very end.
for (size_t i = 0; i < arraysize(end); i++) {
builder.Bind(&end[i]);
}
// Return must be the last instruction.
builder.Return();
// Generate BytecodeArray.
scope.SetScriptScopeInfo(factory->NewScopeInfo(1));
ast_factory.Internalize(isolate());
Handle<BytecodeArray> the_array = builder.ToBytecodeArray(isolate());
CHECK_EQ(the_array->frame_size(),
builder.total_register_count() * kPointerSize);
// Build scorecard of bytecodes encountered in the BytecodeArray.
std::vector<int> scorecard(Bytecodes::ToByte(Bytecode::kLast) + 1);
Bytecode final_bytecode = Bytecode::kLdaZero;
int i = 0;
while (i < the_array->length()) {
uint8_t code = the_array->get(i);
scorecard[code] += 1;
final_bytecode = Bytecodes::FromByte(code);
OperandScale operand_scale = OperandScale::kSingle;
int prefix_offset = 0;
if (Bytecodes::IsPrefixScalingBytecode(final_bytecode)) {
operand_scale = Bytecodes::PrefixBytecodeToOperandScale(final_bytecode);
prefix_offset = 1;
code = the_array->get(i + 1);
scorecard[code] += 1;
final_bytecode = Bytecodes::FromByte(code);
}
i += prefix_offset + Bytecodes::Size(final_bytecode, operand_scale);
}
// Insert entry for illegal bytecode as this is never willingly emitted.
scorecard[Bytecodes::ToByte(Bytecode::kIllegal)] = 1;
// Bytecode for CollectTypeProfile is only emitted when
// Type Information for DevTools is turned on.
scorecard[Bytecodes::ToByte(Bytecode::kCollectTypeProfile)] = 1;
// Check return occurs at the end and only once in the BytecodeArray.
CHECK_EQ(final_bytecode, Bytecode::kReturn);
CHECK_EQ(scorecard[Bytecodes::ToByte(final_bytecode)], 1);
#define CHECK_BYTECODE_PRESENT(Name, ...) \
/* Check Bytecode is marked in scorecard, unless it's a debug break */ \
if (!Bytecodes::IsDebugBreak(Bytecode::k##Name)) { \
EXPECT_GE(scorecard[Bytecodes::ToByte(Bytecode::k##Name)], 1); \
}
BYTECODE_LIST(CHECK_BYTECODE_PRESENT)
#undef CHECK_BYTECODE_PRESENT
}
TEST_F(BytecodeArrayBuilderTest, FrameSizesLookGood) {
for (int locals = 0; locals < 5; locals++) {
for (int temps = 0; temps < 3; temps++) {
BytecodeArrayBuilder builder(zone(), 1, locals);
BytecodeRegisterAllocator* allocator(builder.register_allocator());
for (int i = 0; i < locals; 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.ToName(temp);
}
builder.Return();
Handle<BytecodeArray> the_array = builder.ToBytecodeArray(isolate());
int total_registers = locals + temps;
CHECK_EQ(the_array->frame_size(), total_registers * kPointerSize);
}
}
}
TEST_F(BytecodeArrayBuilderTest, RegisterValues) {
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) {
BytecodeArrayBuilder builder(zone(), 10, 0);
Register receiver(builder.Receiver());
Register param8(builder.Parameter(8));
CHECK_EQ(param8.index() - receiver.index(), 9);
}
TEST_F(BytecodeArrayBuilderTest, Constants) {
BytecodeArrayBuilder builder(zone(), 1, 0);
AstValueFactory ast_factory(zone(), isolate()->ast_string_constants(),
isolate()->heap()->HashSeed());
double heap_num_1 = 3.14;
double heap_num_2 = 5.2;
double nan = std::numeric_limits<double>::quiet_NaN();
const AstRawString* string = ast_factory.GetOneByteString("foo");
const AstRawString* string_copy = ast_factory.GetOneByteString("foo");
builder.LoadLiteral(heap_num_1)
.LoadLiteral(heap_num_2)
.LoadLiteral(string)
.LoadLiteral(heap_num_1)
.LoadLiteral(heap_num_1)
.LoadLiteral(nan)
.LoadLiteral(string_copy)
.LoadLiteral(heap_num_2)
.LoadLiteral(nan)
.Return();
ast_factory.Internalize(isolate());
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
// Should only have one entry for each identical constant.
EXPECT_EQ(4, array->constant_pool()->length());
}
TEST_F(BytecodeArrayBuilderTest, ForwardJumps) {
static const int kFarJumpDistance = 256 + 20;
BytecodeArrayBuilder builder(zone(), 1, 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(ToBooleanMode::kAlreadyBoolean, &near1)
.CompareOperation(Token::Value::EQ, reg, 2)
.JumpIfFalse(ToBooleanMode::kAlreadyBoolean, &near2)
.BinaryOperation(Token::Value::ADD, reg, 1)
.JumpIfTrue(ToBooleanMode::kConvertToBoolean, &near3)
.BinaryOperation(Token::Value::ADD, reg, 2)
.JumpIfFalse(ToBooleanMode::kConvertToBoolean, &near4)
.Bind(&near0)
.Bind(&near1)
.Bind(&near2)
.Bind(&near3)
.Bind(&near4)
.Jump(&far0)
.Bind(&after_jump1)
.CompareOperation(Token::Value::EQ, reg, 3)
.JumpIfTrue(ToBooleanMode::kAlreadyBoolean, &far1)
.CompareOperation(Token::Value::EQ, reg, 4)
.JumpIfFalse(ToBooleanMode::kAlreadyBoolean, &far2)
.BinaryOperation(Token::Value::ADD, reg, 3)
.JumpIfTrue(ToBooleanMode::kConvertToBoolean, &far3)
.BinaryOperation(Token::Value::ADD, reg, 4)
.JumpIfFalse(ToBooleanMode::kConvertToBoolean, &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.GetUnsignedImmediateOperand(0), 22);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfTrue);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 17);
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalse);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 12);
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanTrue);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 7);
iterator.Advance();
// Ignore add operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfToBooleanFalse);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(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(), Bytecode::kJumpIfTrueConstant);
CHECK_EQ(iterator.GetConstantForIndexOperand(0),
Smi::FromInt(kFarJumpDistance - 5));
iterator.Advance();
// Ignore compare operation.
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpIfFalseConstant);
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) {
BytecodeArrayBuilder builder(zone(), 1, 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.GetUnsignedImmediateOperand(0), 0);
iterator.Advance();
for (unsigned 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.GetUnsignedImmediateOperand(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.GetUnsignedImmediateOperand(0), 386);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, SmallSwitch) {
BytecodeArrayBuilder builder(zone(), 1, 1);
// Small jump table that fits into the single-size constant pool
int small_jump_table_size = 5;
int small_jump_table_base = -2;
BytecodeJumpTable* small_jump_table =
builder.AllocateJumpTable(small_jump_table_size, small_jump_table_base);
builder.LoadLiteral(Smi::FromInt(7)).SwitchOnSmiNoFeedback(small_jump_table);
for (int i = 0; i < small_jump_table_size; i++) {
builder.Bind(small_jump_table, small_jump_table_base + i).Debugger();
}
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kSwitchOnSmiNoFeedback);
CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
{
int i = 0;
int switch_end =
iterator.current_offset() + iterator.current_bytecode_size();
for (const auto& entry : iterator.GetJumpTableTargetOffsets()) {
CHECK_EQ(entry.case_value, small_jump_table_base + i);
CHECK_EQ(entry.target_offset, switch_end + i);
i++;
}
CHECK_EQ(i, small_jump_table_size);
}
iterator.Advance();
for (int i = 0; i < small_jump_table_size; i++) {
CHECK_EQ(iterator.current_bytecode(), Bytecode::kDebugger);
iterator.Advance();
}
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, WideSwitch) {
BytecodeArrayBuilder builder(zone(), 1, 1);
// Large jump table that requires a wide Switch bytecode.
int large_jump_table_size = 256;
int large_jump_table_base = -10;
BytecodeJumpTable* large_jump_table =
builder.AllocateJumpTable(large_jump_table_size, large_jump_table_base);
builder.LoadLiteral(Smi::FromInt(7)).SwitchOnSmiNoFeedback(large_jump_table);
for (int i = 0; i < large_jump_table_size; i++) {
builder.Bind(large_jump_table, large_jump_table_base + i).Debugger();
}
builder.Return();
Handle<BytecodeArray> array = builder.ToBytecodeArray(isolate());
BytecodeArrayIterator iterator(array);
CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kSwitchOnSmiNoFeedback);
CHECK_EQ(iterator.current_operand_scale(), OperandScale::kDouble);
{
int i = 0;
int switch_end =
iterator.current_offset() + iterator.current_bytecode_size();
for (const auto& entry : iterator.GetJumpTableTargetOffsets()) {
CHECK_EQ(entry.case_value, large_jump_table_base + i);
CHECK_EQ(entry.target_offset, switch_end + i);
i++;
}
CHECK_EQ(i, large_jump_table_size);
}
iterator.Advance();
for (int i = 0; i < large_jump_table_size; i++) {
CHECK_EQ(iterator.current_bytecode(), Bytecode::kDebugger);
iterator.Advance();
}
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, LabelReuse) {
BytecodeArrayBuilder builder(zone(), 1, 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.GetUnsignedImmediateOperand(0), 2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 0);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 3);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
TEST_F(BytecodeArrayBuilderTest, LabelAddressReuse) {
static const int kRepeats = 3;
BytecodeArrayBuilder builder(zone(), 1, 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.GetUnsignedImmediateOperand(0), 2);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 0);
iterator.Advance();
CHECK_EQ(iterator.current_bytecode(), Bytecode::kJumpLoop);
CHECK_EQ(iterator.GetUnsignedImmediateOperand(0), 3);
iterator.Advance();
}
CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
iterator.Advance();
CHECK(iterator.done());
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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