| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/full-codegen/full-codegen.h" |
| |
| #include "src/ast/ast-numbering.h" |
| #include "src/ast/ast.h" |
| #include "src/ast/prettyprinter.h" |
| #include "src/ast/scopeinfo.h" |
| #include "src/ast/scopes.h" |
| #include "src/code-factory.h" |
| #include "src/codegen.h" |
| #include "src/compiler.h" |
| #include "src/debug/debug.h" |
| #include "src/debug/liveedit.h" |
| #include "src/frames-inl.h" |
| #include "src/isolate-inl.h" |
| #include "src/macro-assembler.h" |
| #include "src/snapshot/snapshot.h" |
| #include "src/tracing/trace-event.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #define __ ACCESS_MASM(masm()) |
| |
| bool FullCodeGenerator::MakeCode(CompilationInfo* info) { |
| Isolate* isolate = info->isolate(); |
| |
| RuntimeCallTimerScope runtimeTimer(isolate, |
| &RuntimeCallStats::CompileFullCode); |
| TimerEventScope<TimerEventCompileFullCode> timer(info->isolate()); |
| TRACE_EVENT0("v8", "V8.CompileFullCode"); |
| |
| Handle<Script> script = info->script(); |
| if (!script->IsUndefined() && !script->source()->IsUndefined()) { |
| int len = String::cast(script->source())->length(); |
| isolate->counters()->total_full_codegen_source_size()->Increment(len); |
| } |
| CodeGenerator::MakeCodePrologue(info, "full"); |
| const int kInitialBufferSize = 4 * KB; |
| MacroAssembler masm(info->isolate(), NULL, kInitialBufferSize, |
| CodeObjectRequired::kYes); |
| if (info->will_serialize()) masm.enable_serializer(); |
| |
| LOG_CODE_EVENT(isolate, |
| CodeStartLinePosInfoRecordEvent(masm.positions_recorder())); |
| |
| FullCodeGenerator cgen(&masm, info); |
| cgen.Generate(); |
| if (cgen.HasStackOverflow()) { |
| DCHECK(!isolate->has_pending_exception()); |
| return false; |
| } |
| unsigned table_offset = cgen.EmitBackEdgeTable(); |
| |
| Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&masm, info); |
| cgen.PopulateDeoptimizationData(code); |
| cgen.PopulateTypeFeedbackInfo(code); |
| cgen.PopulateHandlerTable(code); |
| code->set_has_deoptimization_support(info->HasDeoptimizationSupport()); |
| code->set_has_reloc_info_for_serialization(info->will_serialize()); |
| code->set_allow_osr_at_loop_nesting_level(0); |
| code->set_profiler_ticks(0); |
| code->set_back_edge_table_offset(table_offset); |
| CodeGenerator::PrintCode(code, info); |
| info->SetCode(code); |
| void* line_info = masm.positions_recorder()->DetachJITHandlerData(); |
| LOG_CODE_EVENT(isolate, CodeEndLinePosInfoRecordEvent( |
| AbstractCode::cast(*code), line_info)); |
| |
| #ifdef DEBUG |
| // Check that no context-specific object has been embedded. |
| code->VerifyEmbeddedObjects(Code::kNoContextSpecificPointers); |
| #endif // DEBUG |
| return true; |
| } |
| |
| |
| unsigned FullCodeGenerator::EmitBackEdgeTable() { |
| // The back edge table consists of a length (in number of entries) |
| // field, and then a sequence of entries. Each entry is a pair of AST id |
| // and code-relative pc offset. |
| masm()->Align(kPointerSize); |
| unsigned offset = masm()->pc_offset(); |
| unsigned length = back_edges_.length(); |
| __ dd(length); |
| for (unsigned i = 0; i < length; ++i) { |
| __ dd(back_edges_[i].id.ToInt()); |
| __ dd(back_edges_[i].pc); |
| __ dd(back_edges_[i].loop_depth); |
| } |
| return offset; |
| } |
| |
| |
| void FullCodeGenerator::PopulateDeoptimizationData(Handle<Code> code) { |
| // Fill in the deoptimization information. |
| DCHECK(info_->HasDeoptimizationSupport() || bailout_entries_.is_empty()); |
| if (!info_->HasDeoptimizationSupport()) return; |
| int length = bailout_entries_.length(); |
| Handle<DeoptimizationOutputData> data = |
| DeoptimizationOutputData::New(isolate(), length, TENURED); |
| for (int i = 0; i < length; i++) { |
| data->SetAstId(i, bailout_entries_[i].id); |
| data->SetPcAndState(i, Smi::FromInt(bailout_entries_[i].pc_and_state)); |
| } |
| code->set_deoptimization_data(*data); |
| } |
| |
| |
| void FullCodeGenerator::PopulateTypeFeedbackInfo(Handle<Code> code) { |
| Handle<TypeFeedbackInfo> info = isolate()->factory()->NewTypeFeedbackInfo(); |
| info->set_ic_total_count(ic_total_count_); |
| DCHECK(!isolate()->heap()->InNewSpace(*info)); |
| code->set_type_feedback_info(*info); |
| } |
| |
| |
| void FullCodeGenerator::PopulateHandlerTable(Handle<Code> code) { |
| int handler_table_size = static_cast<int>(handler_table_.size()); |
| Handle<HandlerTable> table = |
| Handle<HandlerTable>::cast(isolate()->factory()->NewFixedArray( |
| HandlerTable::LengthForRange(handler_table_size), TENURED)); |
| for (int i = 0; i < handler_table_size; ++i) { |
| HandlerTable::CatchPrediction prediction = |
| handler_table_[i].try_catch_depth > 0 ? HandlerTable::CAUGHT |
| : HandlerTable::UNCAUGHT; |
| table->SetRangeStart(i, handler_table_[i].range_start); |
| table->SetRangeEnd(i, handler_table_[i].range_end); |
| table->SetRangeHandler(i, handler_table_[i].handler_offset, prediction); |
| table->SetRangeData(i, handler_table_[i].stack_depth); |
| } |
| code->set_handler_table(*table); |
| } |
| |
| |
| int FullCodeGenerator::NewHandlerTableEntry() { |
| int index = static_cast<int>(handler_table_.size()); |
| HandlerTableEntry entry = {0, 0, 0, 0, 0}; |
| handler_table_.push_back(entry); |
| return index; |
| } |
| |
| |
| bool FullCodeGenerator::MustCreateObjectLiteralWithRuntime( |
| ObjectLiteral* expr) const { |
| return masm()->serializer_enabled() || |
| !FastCloneShallowObjectStub::IsSupported(expr); |
| } |
| |
| |
| bool FullCodeGenerator::MustCreateArrayLiteralWithRuntime( |
| ArrayLiteral* expr) const { |
| return expr->depth() > 1 || |
| expr->values()->length() > JSArray::kInitialMaxFastElementArray; |
| } |
| |
| |
| void FullCodeGenerator::Initialize() { |
| InitializeAstVisitor(info_->isolate()); |
| masm_->set_emit_debug_code(FLAG_debug_code); |
| masm_->set_predictable_code_size(true); |
| } |
| |
| void FullCodeGenerator::PrepareForBailout(Expression* node, |
| BailoutState state) { |
| PrepareForBailoutForId(node->id(), state); |
| } |
| |
| |
| void FullCodeGenerator::CallLoadIC(TypeofMode typeof_mode, |
| TypeFeedbackId id) { |
| Handle<Code> ic = CodeFactory::LoadIC(isolate(), typeof_mode).code(); |
| CallIC(ic, id); |
| } |
| |
| |
| void FullCodeGenerator::CallStoreIC(TypeFeedbackId id) { |
| Handle<Code> ic = CodeFactory::StoreIC(isolate(), language_mode()).code(); |
| CallIC(ic, id); |
| } |
| |
| |
| void FullCodeGenerator::RecordJSReturnSite(Call* call) { |
| // We record the offset of the function return so we can rebuild the frame |
| // if the function was inlined, i.e., this is the return address in the |
| // inlined function's frame. |
| // |
| // The bailout state is ignored. We defensively set it to TOS_REGISTER, which |
| // is the real state of the unoptimized code at the return site. |
| PrepareForBailoutForId(call->ReturnId(), BailoutState::TOS_REGISTER); |
| #ifdef DEBUG |
| // In debug builds, mark the return so we can verify that this function |
| // was called. |
| DCHECK(!call->return_is_recorded_); |
| call->return_is_recorded_ = true; |
| #endif |
| } |
| |
| void FullCodeGenerator::PrepareForBailoutForId(BailoutId id, |
| BailoutState state) { |
| // There's no need to prepare this code for bailouts from already optimized |
| // code or code that can't be optimized. |
| if (!info_->HasDeoptimizationSupport()) return; |
| unsigned pc_and_state = |
| BailoutStateField::encode(state) | PcField::encode(masm_->pc_offset()); |
| DCHECK(Smi::IsValid(pc_and_state)); |
| #ifdef DEBUG |
| for (int i = 0; i < bailout_entries_.length(); ++i) { |
| DCHECK(bailout_entries_[i].id != id); |
| } |
| #endif |
| BailoutEntry entry = { id, pc_and_state }; |
| bailout_entries_.Add(entry, zone()); |
| } |
| |
| |
| void FullCodeGenerator::RecordBackEdge(BailoutId ast_id) { |
| // The pc offset does not need to be encoded and packed together with a state. |
| DCHECK(masm_->pc_offset() > 0); |
| DCHECK(loop_depth() > 0); |
| uint8_t depth = Min(loop_depth(), Code::kMaxLoopNestingMarker); |
| BackEdgeEntry entry = |
| { ast_id, static_cast<unsigned>(masm_->pc_offset()), depth }; |
| back_edges_.Add(entry, zone()); |
| } |
| |
| |
| bool FullCodeGenerator::ShouldInlineSmiCase(Token::Value op) { |
| // Inline smi case inside loops, but not division and modulo which |
| // are too complicated and take up too much space. |
| if (op == Token::DIV ||op == Token::MOD) return false; |
| if (FLAG_always_inline_smi_code) return true; |
| return loop_depth_ > 0; |
| } |
| |
| |
| void FullCodeGenerator::EffectContext::Plug(Variable* var) const { |
| DCHECK(var->IsStackAllocated() || var->IsContextSlot()); |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::Plug(Variable* var) const { |
| DCHECK(var->IsStackAllocated() || var->IsContextSlot()); |
| codegen()->GetVar(result_register(), var); |
| } |
| |
| |
| void FullCodeGenerator::TestContext::Plug(Variable* var) const { |
| DCHECK(var->IsStackAllocated() || var->IsContextSlot()); |
| // For simplicity we always test the accumulator register. |
| codegen()->GetVar(result_register(), var); |
| codegen()->PrepareForBailoutBeforeSplit(condition(), false, NULL, NULL); |
| codegen()->DoTest(this); |
| } |
| |
| |
| void FullCodeGenerator::EffectContext::Plug(Register reg) const { |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::Plug(Register reg) const { |
| __ Move(result_register(), reg); |
| } |
| |
| |
| void FullCodeGenerator::StackValueContext::Plug(Register reg) const { |
| codegen()->PushOperand(reg); |
| } |
| |
| |
| void FullCodeGenerator::TestContext::Plug(Register reg) const { |
| // For simplicity we always test the accumulator register. |
| __ Move(result_register(), reg); |
| codegen()->PrepareForBailoutBeforeSplit(condition(), false, NULL, NULL); |
| codegen()->DoTest(this); |
| } |
| |
| |
| void FullCodeGenerator::EffectContext::Plug(bool flag) const {} |
| |
| void FullCodeGenerator::EffectContext::DropAndPlug(int count, |
| Register reg) const { |
| DCHECK(count > 0); |
| codegen()->DropOperands(count); |
| } |
| |
| void FullCodeGenerator::AccumulatorValueContext::DropAndPlug( |
| int count, Register reg) const { |
| DCHECK(count > 0); |
| codegen()->DropOperands(count); |
| __ Move(result_register(), reg); |
| } |
| |
| void FullCodeGenerator::TestContext::DropAndPlug(int count, |
| Register reg) const { |
| DCHECK(count > 0); |
| // For simplicity we always test the accumulator register. |
| codegen()->DropOperands(count); |
| __ Move(result_register(), reg); |
| codegen()->PrepareForBailoutBeforeSplit(condition(), false, NULL, NULL); |
| codegen()->DoTest(this); |
| } |
| |
| void FullCodeGenerator::EffectContext::PlugTOS() const { |
| codegen()->DropOperands(1); |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::PlugTOS() const { |
| codegen()->PopOperand(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::StackValueContext::PlugTOS() const { |
| } |
| |
| |
| void FullCodeGenerator::TestContext::PlugTOS() const { |
| // For simplicity we always test the accumulator register. |
| codegen()->PopOperand(result_register()); |
| codegen()->PrepareForBailoutBeforeSplit(condition(), false, NULL, NULL); |
| codegen()->DoTest(this); |
| } |
| |
| |
| void FullCodeGenerator::EffectContext::PrepareTest( |
| Label* materialize_true, |
| Label* materialize_false, |
| Label** if_true, |
| Label** if_false, |
| Label** fall_through) const { |
| // In an effect context, the true and the false case branch to the |
| // same label. |
| *if_true = *if_false = *fall_through = materialize_true; |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::PrepareTest( |
| Label* materialize_true, |
| Label* materialize_false, |
| Label** if_true, |
| Label** if_false, |
| Label** fall_through) const { |
| *if_true = *fall_through = materialize_true; |
| *if_false = materialize_false; |
| } |
| |
| |
| void FullCodeGenerator::StackValueContext::PrepareTest( |
| Label* materialize_true, |
| Label* materialize_false, |
| Label** if_true, |
| Label** if_false, |
| Label** fall_through) const { |
| *if_true = *fall_through = materialize_true; |
| *if_false = materialize_false; |
| } |
| |
| |
| void FullCodeGenerator::TestContext::PrepareTest( |
| Label* materialize_true, |
| Label* materialize_false, |
| Label** if_true, |
| Label** if_false, |
| Label** fall_through) const { |
| *if_true = true_label_; |
| *if_false = false_label_; |
| *fall_through = fall_through_; |
| } |
| |
| |
| void FullCodeGenerator::DoTest(const TestContext* context) { |
| DoTest(context->condition(), |
| context->true_label(), |
| context->false_label(), |
| context->fall_through()); |
| } |
| |
| |
| void FullCodeGenerator::VisitDeclarations( |
| ZoneList<Declaration*>* declarations) { |
| ZoneList<Handle<Object> >* saved_globals = globals_; |
| ZoneList<Handle<Object> > inner_globals(10, zone()); |
| globals_ = &inner_globals; |
| |
| AstVisitor::VisitDeclarations(declarations); |
| |
| if (!globals_->is_empty()) { |
| // Invoke the platform-dependent code generator to do the actual |
| // declaration of the global functions and variables. |
| Handle<FixedArray> array = |
| isolate()->factory()->NewFixedArray(globals_->length(), TENURED); |
| for (int i = 0; i < globals_->length(); ++i) |
| array->set(i, *globals_->at(i)); |
| DeclareGlobals(array); |
| } |
| |
| globals_ = saved_globals; |
| } |
| |
| |
| void FullCodeGenerator::VisitImportDeclaration(ImportDeclaration* declaration) { |
| VariableProxy* proxy = declaration->proxy(); |
| Variable* variable = proxy->var(); |
| switch (variable->location()) { |
| case VariableLocation::GLOBAL: |
| case VariableLocation::UNALLOCATED: |
| // TODO(rossberg) |
| break; |
| |
| case VariableLocation::CONTEXT: { |
| Comment cmnt(masm_, "[ ImportDeclaration"); |
| EmitDebugCheckDeclarationContext(variable); |
| // TODO(rossberg) |
| break; |
| } |
| |
| case VariableLocation::PARAMETER: |
| case VariableLocation::LOCAL: |
| case VariableLocation::LOOKUP: |
| UNREACHABLE(); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitExportDeclaration(ExportDeclaration* declaration) { |
| // TODO(rossberg) |
| } |
| |
| |
| void FullCodeGenerator::VisitVariableProxy(VariableProxy* expr) { |
| Comment cmnt(masm_, "[ VariableProxy"); |
| EmitVariableLoad(expr); |
| } |
| |
| |
| void FullCodeGenerator::VisitSloppyBlockFunctionStatement( |
| SloppyBlockFunctionStatement* declaration) { |
| Visit(declaration->statement()); |
| } |
| |
| |
| int FullCodeGenerator::DeclareGlobalsFlags() { |
| return info_->GetDeclareGlobalsFlags(); |
| } |
| |
| void FullCodeGenerator::PushOperand(Handle<Object> handle) { |
| OperandStackDepthIncrement(1); |
| __ Push(handle); |
| } |
| |
| void FullCodeGenerator::PushOperand(Smi* smi) { |
| OperandStackDepthIncrement(1); |
| __ Push(smi); |
| } |
| |
| void FullCodeGenerator::PushOperand(Register reg) { |
| OperandStackDepthIncrement(1); |
| __ Push(reg); |
| } |
| |
| void FullCodeGenerator::PopOperand(Register reg) { |
| OperandStackDepthDecrement(1); |
| __ Pop(reg); |
| } |
| |
| void FullCodeGenerator::DropOperands(int count) { |
| OperandStackDepthDecrement(count); |
| __ Drop(count); |
| } |
| |
| void FullCodeGenerator::CallRuntimeWithOperands(Runtime::FunctionId id) { |
| OperandStackDepthDecrement(Runtime::FunctionForId(id)->nargs); |
| __ CallRuntime(id); |
| } |
| |
| void FullCodeGenerator::OperandStackDepthIncrement(int count) { |
| DCHECK_IMPLIES(!HasStackOverflow(), operand_stack_depth_ >= 0); |
| DCHECK_GE(count, 0); |
| operand_stack_depth_ += count; |
| } |
| |
| void FullCodeGenerator::OperandStackDepthDecrement(int count) { |
| DCHECK_IMPLIES(!HasStackOverflow(), operand_stack_depth_ >= count); |
| DCHECK_GE(count, 0); |
| operand_stack_depth_ -= count; |
| } |
| |
| void FullCodeGenerator::EmitSubString(CallRuntime* expr) { |
| // Load the arguments on the stack and call the stub. |
| SubStringStub stub(isolate()); |
| ZoneList<Expression*>* args = expr->arguments(); |
| DCHECK(args->length() == 3); |
| VisitForStackValue(args->at(0)); |
| VisitForStackValue(args->at(1)); |
| VisitForStackValue(args->at(2)); |
| __ CallStub(&stub); |
| OperandStackDepthDecrement(3); |
| context()->Plug(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::EmitRegExpExec(CallRuntime* expr) { |
| // Load the arguments on the stack and call the stub. |
| RegExpExecStub stub(isolate()); |
| ZoneList<Expression*>* args = expr->arguments(); |
| DCHECK(args->length() == 4); |
| VisitForStackValue(args->at(0)); |
| VisitForStackValue(args->at(1)); |
| VisitForStackValue(args->at(2)); |
| VisitForStackValue(args->at(3)); |
| __ CallStub(&stub); |
| OperandStackDepthDecrement(4); |
| context()->Plug(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::EmitMathPow(CallRuntime* expr) { |
| // Load the arguments on the stack and call the runtime function. |
| MathPowStub stub(isolate(), MathPowStub::ON_STACK); |
| ZoneList<Expression*>* args = expr->arguments(); |
| DCHECK(args->length() == 2); |
| VisitForStackValue(args->at(0)); |
| VisitForStackValue(args->at(1)); |
| __ CallStub(&stub); |
| OperandStackDepthDecrement(2); |
| context()->Plug(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::EmitIntrinsicAsStubCall(CallRuntime* expr, |
| const Callable& callable) { |
| ZoneList<Expression*>* args = expr->arguments(); |
| int param_count = callable.descriptor().GetRegisterParameterCount(); |
| DCHECK_EQ(args->length(), param_count); |
| |
| if (param_count > 0) { |
| int last = param_count - 1; |
| // Put all but last arguments on stack. |
| for (int i = 0; i < last; i++) { |
| VisitForStackValue(args->at(i)); |
| } |
| // The last argument goes to the accumulator. |
| VisitForAccumulatorValue(args->at(last)); |
| |
| // Move the arguments to the registers, as required by the stub. |
| __ Move(callable.descriptor().GetRegisterParameter(last), |
| result_register()); |
| for (int i = last; i-- > 0;) { |
| PopOperand(callable.descriptor().GetRegisterParameter(i)); |
| } |
| } |
| __ Call(callable.code(), RelocInfo::CODE_TARGET); |
| |
| // Reload the context register after the call as i.e. TurboFan code stubs |
| // won't preserve the context register. |
| LoadFromFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| context()->Plug(result_register()); |
| } |
| |
| void FullCodeGenerator::EmitNewObject(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::FastNewObject(isolate())); |
| } |
| |
| void FullCodeGenerator::EmitNumberToString(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::NumberToString(isolate())); |
| } |
| |
| |
| void FullCodeGenerator::EmitToString(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToString(isolate())); |
| } |
| |
| |
| void FullCodeGenerator::EmitToName(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToName(isolate())); |
| } |
| |
| |
| void FullCodeGenerator::EmitToLength(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToLength(isolate())); |
| } |
| |
| void FullCodeGenerator::EmitToInteger(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToInteger(isolate())); |
| } |
| |
| void FullCodeGenerator::EmitToNumber(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToNumber(isolate())); |
| } |
| |
| |
| void FullCodeGenerator::EmitToObject(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::ToObject(isolate())); |
| } |
| |
| |
| void FullCodeGenerator::EmitRegExpConstructResult(CallRuntime* expr) { |
| EmitIntrinsicAsStubCall(expr, CodeFactory::RegExpConstructResult(isolate())); |
| } |
| |
| void FullCodeGenerator::EmitHasProperty() { |
| Callable callable = CodeFactory::HasProperty(isolate()); |
| PopOperand(callable.descriptor().GetRegisterParameter(1)); |
| PopOperand(callable.descriptor().GetRegisterParameter(0)); |
| __ Call(callable.code(), RelocInfo::CODE_TARGET); |
| RestoreContext(); |
| } |
| |
| bool RecordStatementPosition(MacroAssembler* masm, int pos) { |
| if (pos == RelocInfo::kNoPosition) return false; |
| masm->positions_recorder()->RecordStatementPosition(pos); |
| masm->positions_recorder()->RecordPosition(pos); |
| return masm->positions_recorder()->WriteRecordedPositions(); |
| } |
| |
| |
| bool RecordPosition(MacroAssembler* masm, int pos) { |
| if (pos == RelocInfo::kNoPosition) return false; |
| masm->positions_recorder()->RecordPosition(pos); |
| return masm->positions_recorder()->WriteRecordedPositions(); |
| } |
| |
| |
| void FullCodeGenerator::SetFunctionPosition(FunctionLiteral* fun) { |
| RecordPosition(masm_, fun->start_position()); |
| } |
| |
| |
| void FullCodeGenerator::SetReturnPosition(FunctionLiteral* fun) { |
| // For default constructors, start position equals end position, and there |
| // is no source code besides the class literal. |
| int pos = std::max(fun->start_position(), fun->end_position() - 1); |
| RecordStatementPosition(masm_, pos); |
| if (info_->is_debug()) { |
| // Always emit a debug break slot before a return. |
| DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_RETURN); |
| } |
| } |
| |
| |
| void FullCodeGenerator::SetStatementPosition( |
| Statement* stmt, FullCodeGenerator::InsertBreak insert_break) { |
| if (stmt->position() == RelocInfo::kNoPosition) return; |
| bool recorded = RecordStatementPosition(masm_, stmt->position()); |
| if (recorded && insert_break == INSERT_BREAK && info_->is_debug() && |
| !stmt->IsDebuggerStatement()) { |
| DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION); |
| } |
| } |
| |
| void FullCodeGenerator::SetExpressionPosition(Expression* expr) { |
| if (expr->position() == RelocInfo::kNoPosition) return; |
| RecordPosition(masm_, expr->position()); |
| } |
| |
| |
| void FullCodeGenerator::SetExpressionAsStatementPosition(Expression* expr) { |
| if (expr->position() == RelocInfo::kNoPosition) return; |
| bool recorded = RecordStatementPosition(masm_, expr->position()); |
| if (recorded && info_->is_debug()) { |
| DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION); |
| } |
| } |
| |
| void FullCodeGenerator::SetCallPosition(Expression* expr, |
| TailCallMode tail_call_mode) { |
| if (expr->position() == RelocInfo::kNoPosition) return; |
| RecordPosition(masm_, expr->position()); |
| if (info_->is_debug()) { |
| RelocInfo::Mode mode = (tail_call_mode == TailCallMode::kAllow) |
| ? RelocInfo::DEBUG_BREAK_SLOT_AT_TAIL_CALL |
| : RelocInfo::DEBUG_BREAK_SLOT_AT_CALL; |
| // Always emit a debug break slot before a call. |
| DebugCodegen::GenerateSlot(masm_, mode); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitSuperPropertyReference( |
| SuperPropertyReference* super) { |
| __ CallRuntime(Runtime::kThrowUnsupportedSuperError); |
| // Even though this expression doesn't produce a value, we need to simulate |
| // plugging of the value context to ensure stack depth tracking is in sync. |
| if (context()->IsStackValue()) OperandStackDepthIncrement(1); |
| } |
| |
| |
| void FullCodeGenerator::VisitSuperCallReference(SuperCallReference* super) { |
| // Handled by VisitCall |
| UNREACHABLE(); |
| } |
| |
| |
| void FullCodeGenerator::EmitDebugBreakInOptimizedCode(CallRuntime* expr) { |
| context()->Plug(handle(Smi::FromInt(0), isolate())); |
| } |
| |
| |
| void FullCodeGenerator::VisitBinaryOperation(BinaryOperation* expr) { |
| switch (expr->op()) { |
| case Token::COMMA: |
| return VisitComma(expr); |
| case Token::OR: |
| case Token::AND: |
| return VisitLogicalExpression(expr); |
| default: |
| return VisitArithmeticExpression(expr); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitInDuplicateContext(Expression* expr) { |
| if (context()->IsEffect()) { |
| VisitForEffect(expr); |
| } else if (context()->IsAccumulatorValue()) { |
| VisitForAccumulatorValue(expr); |
| } else if (context()->IsStackValue()) { |
| VisitForStackValue(expr); |
| } else if (context()->IsTest()) { |
| const TestContext* test = TestContext::cast(context()); |
| VisitForControl(expr, test->true_label(), test->false_label(), |
| test->fall_through()); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitComma(BinaryOperation* expr) { |
| Comment cmnt(masm_, "[ Comma"); |
| VisitForEffect(expr->left()); |
| VisitInDuplicateContext(expr->right()); |
| } |
| |
| |
| void FullCodeGenerator::VisitLogicalExpression(BinaryOperation* expr) { |
| bool is_logical_and = expr->op() == Token::AND; |
| Comment cmnt(masm_, is_logical_and ? "[ Logical AND" : "[ Logical OR"); |
| Expression* left = expr->left(); |
| Expression* right = expr->right(); |
| BailoutId right_id = expr->RightId(); |
| Label done; |
| |
| if (context()->IsTest()) { |
| Label eval_right; |
| const TestContext* test = TestContext::cast(context()); |
| if (is_logical_and) { |
| VisitForControl(left, &eval_right, test->false_label(), &eval_right); |
| } else { |
| VisitForControl(left, test->true_label(), &eval_right, &eval_right); |
| } |
| PrepareForBailoutForId(right_id, BailoutState::NO_REGISTERS); |
| __ bind(&eval_right); |
| |
| } else if (context()->IsAccumulatorValue()) { |
| VisitForAccumulatorValue(left); |
| // We want the value in the accumulator for the test, and on the stack in |
| // case we need it. |
| __ Push(result_register()); |
| Label discard, restore; |
| if (is_logical_and) { |
| DoTest(left, &discard, &restore, &restore); |
| } else { |
| DoTest(left, &restore, &discard, &restore); |
| } |
| __ bind(&restore); |
| __ Pop(result_register()); |
| __ jmp(&done); |
| __ bind(&discard); |
| __ Drop(1); |
| PrepareForBailoutForId(right_id, BailoutState::NO_REGISTERS); |
| |
| } else if (context()->IsStackValue()) { |
| VisitForAccumulatorValue(left); |
| // We want the value in the accumulator for the test, and on the stack in |
| // case we need it. |
| __ Push(result_register()); |
| Label discard; |
| if (is_logical_and) { |
| DoTest(left, &discard, &done, &discard); |
| } else { |
| DoTest(left, &done, &discard, &discard); |
| } |
| __ bind(&discard); |
| __ Drop(1); |
| PrepareForBailoutForId(right_id, BailoutState::NO_REGISTERS); |
| |
| } else { |
| DCHECK(context()->IsEffect()); |
| Label eval_right; |
| if (is_logical_and) { |
| VisitForControl(left, &eval_right, &done, &eval_right); |
| } else { |
| VisitForControl(left, &done, &eval_right, &eval_right); |
| } |
| PrepareForBailoutForId(right_id, BailoutState::NO_REGISTERS); |
| __ bind(&eval_right); |
| } |
| |
| VisitInDuplicateContext(right); |
| __ bind(&done); |
| } |
| |
| |
| void FullCodeGenerator::VisitArithmeticExpression(BinaryOperation* expr) { |
| Token::Value op = expr->op(); |
| Comment cmnt(masm_, "[ ArithmeticExpression"); |
| Expression* left = expr->left(); |
| Expression* right = expr->right(); |
| |
| VisitForStackValue(left); |
| VisitForAccumulatorValue(right); |
| |
| SetExpressionPosition(expr); |
| if (ShouldInlineSmiCase(op)) { |
| EmitInlineSmiBinaryOp(expr, op, left, right); |
| } else { |
| EmitBinaryOp(expr, op); |
| } |
| } |
| |
| void FullCodeGenerator::VisitProperty(Property* expr) { |
| Comment cmnt(masm_, "[ Property"); |
| SetExpressionPosition(expr); |
| |
| Expression* key = expr->key(); |
| |
| if (key->IsPropertyName()) { |
| if (!expr->IsSuperAccess()) { |
| VisitForAccumulatorValue(expr->obj()); |
| __ Move(LoadDescriptor::ReceiverRegister(), result_register()); |
| EmitNamedPropertyLoad(expr); |
| } else { |
| VisitForStackValue(expr->obj()->AsSuperPropertyReference()->this_var()); |
| VisitForStackValue( |
| expr->obj()->AsSuperPropertyReference()->home_object()); |
| EmitNamedSuperPropertyLoad(expr); |
| } |
| } else { |
| if (!expr->IsSuperAccess()) { |
| VisitForStackValue(expr->obj()); |
| VisitForAccumulatorValue(expr->key()); |
| __ Move(LoadDescriptor::NameRegister(), result_register()); |
| PopOperand(LoadDescriptor::ReceiverRegister()); |
| EmitKeyedPropertyLoad(expr); |
| } else { |
| VisitForStackValue(expr->obj()->AsSuperPropertyReference()->this_var()); |
| VisitForStackValue( |
| expr->obj()->AsSuperPropertyReference()->home_object()); |
| VisitForStackValue(expr->key()); |
| EmitKeyedSuperPropertyLoad(expr); |
| } |
| } |
| PrepareForBailoutForId(expr->LoadId(), BailoutState::TOS_REGISTER); |
| context()->Plug(result_register()); |
| } |
| |
| void FullCodeGenerator::VisitForTypeofValue(Expression* expr) { |
| VariableProxy* proxy = expr->AsVariableProxy(); |
| DCHECK(!context()->IsEffect()); |
| DCHECK(!context()->IsTest()); |
| |
| if (proxy != NULL && (proxy->var()->IsUnallocatedOrGlobalSlot() || |
| proxy->var()->IsLookupSlot())) { |
| EmitVariableLoad(proxy, INSIDE_TYPEOF); |
| PrepareForBailout(proxy, BailoutState::TOS_REGISTER); |
| } else { |
| // This expression cannot throw a reference error at the top level. |
| VisitInDuplicateContext(expr); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitBlock(Block* stmt) { |
| Comment cmnt(masm_, "[ Block"); |
| NestedBlock nested_block(this, stmt); |
| |
| { |
| EnterBlockScopeIfNeeded block_scope_state( |
| this, stmt->scope(), stmt->EntryId(), stmt->DeclsId(), stmt->ExitId()); |
| VisitStatements(stmt->statements()); |
| __ bind(nested_block.break_label()); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitDoExpression(DoExpression* expr) { |
| Comment cmnt(masm_, "[ Do Expression"); |
| SetExpressionPosition(expr); |
| VisitBlock(expr->block()); |
| EmitVariableLoad(expr->result()); |
| } |
| |
| |
| void FullCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) { |
| Comment cmnt(masm_, "[ ExpressionStatement"); |
| SetStatementPosition(stmt); |
| VisitForEffect(stmt->expression()); |
| } |
| |
| |
| void FullCodeGenerator::VisitEmptyStatement(EmptyStatement* stmt) { |
| Comment cmnt(masm_, "[ EmptyStatement"); |
| } |
| |
| |
| void FullCodeGenerator::VisitIfStatement(IfStatement* stmt) { |
| Comment cmnt(masm_, "[ IfStatement"); |
| SetStatementPosition(stmt); |
| Label then_part, else_part, done; |
| |
| if (stmt->HasElseStatement()) { |
| VisitForControl(stmt->condition(), &then_part, &else_part, &then_part); |
| PrepareForBailoutForId(stmt->ThenId(), BailoutState::NO_REGISTERS); |
| __ bind(&then_part); |
| Visit(stmt->then_statement()); |
| __ jmp(&done); |
| |
| PrepareForBailoutForId(stmt->ElseId(), BailoutState::NO_REGISTERS); |
| __ bind(&else_part); |
| Visit(stmt->else_statement()); |
| } else { |
| VisitForControl(stmt->condition(), &then_part, &done, &then_part); |
| PrepareForBailoutForId(stmt->ThenId(), BailoutState::NO_REGISTERS); |
| __ bind(&then_part); |
| Visit(stmt->then_statement()); |
| |
| PrepareForBailoutForId(stmt->ElseId(), BailoutState::NO_REGISTERS); |
| } |
| __ bind(&done); |
| PrepareForBailoutForId(stmt->IfId(), BailoutState::NO_REGISTERS); |
| } |
| |
| void FullCodeGenerator::EmitContinue(Statement* target) { |
| NestedStatement* current = nesting_stack_; |
| int context_length = 0; |
| // When continuing, we clobber the unpredictable value in the accumulator |
| // with one that's safe for GC. If we hit an exit from the try block of |
| // try...finally on our way out, we will unconditionally preserve the |
| // accumulator on the stack. |
| ClearAccumulator(); |
| while (!current->IsContinueTarget(target)) { |
| if (current->IsTryFinally()) { |
| Comment cmnt(masm(), "[ Deferred continue through finally"); |
| current->Exit(&context_length); |
| DCHECK_EQ(-1, context_length); |
| current->AsTryFinally()->deferred_commands()->RecordContinue(target); |
| return; |
| } |
| current = current->Exit(&context_length); |
| } |
| int stack_depth = current->GetStackDepthAtTarget(); |
| int stack_drop = operand_stack_depth_ - stack_depth; |
| DCHECK_GE(stack_drop, 0); |
| __ Drop(stack_drop); |
| if (context_length > 0) { |
| while (context_length > 0) { |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| --context_length; |
| } |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| |
| __ jmp(current->AsIteration()->continue_label()); |
| } |
| |
| void FullCodeGenerator::VisitContinueStatement(ContinueStatement* stmt) { |
| Comment cmnt(masm_, "[ ContinueStatement"); |
| SetStatementPosition(stmt); |
| EmitContinue(stmt->target()); |
| } |
| |
| void FullCodeGenerator::EmitBreak(Statement* target) { |
| NestedStatement* current = nesting_stack_; |
| int context_length = 0; |
| // When breaking, we clobber the unpredictable value in the accumulator |
| // with one that's safe for GC. If we hit an exit from the try block of |
| // try...finally on our way out, we will unconditionally preserve the |
| // accumulator on the stack. |
| ClearAccumulator(); |
| while (!current->IsBreakTarget(target)) { |
| if (current->IsTryFinally()) { |
| Comment cmnt(masm(), "[ Deferred break through finally"); |
| current->Exit(&context_length); |
| DCHECK_EQ(-1, context_length); |
| current->AsTryFinally()->deferred_commands()->RecordBreak(target); |
| return; |
| } |
| current = current->Exit(&context_length); |
| } |
| int stack_depth = current->GetStackDepthAtTarget(); |
| int stack_drop = operand_stack_depth_ - stack_depth; |
| DCHECK_GE(stack_drop, 0); |
| __ Drop(stack_drop); |
| if (context_length > 0) { |
| while (context_length > 0) { |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| --context_length; |
| } |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| |
| __ jmp(current->AsBreakable()->break_label()); |
| } |
| |
| void FullCodeGenerator::VisitBreakStatement(BreakStatement* stmt) { |
| Comment cmnt(masm_, "[ BreakStatement"); |
| SetStatementPosition(stmt); |
| EmitBreak(stmt->target()); |
| } |
| |
| void FullCodeGenerator::EmitUnwindAndReturn() { |
| NestedStatement* current = nesting_stack_; |
| int context_length = 0; |
| while (current != NULL) { |
| if (current->IsTryFinally()) { |
| Comment cmnt(masm(), "[ Deferred return through finally"); |
| current->Exit(&context_length); |
| DCHECK_EQ(-1, context_length); |
| current->AsTryFinally()->deferred_commands()->RecordReturn(); |
| return; |
| } |
| current = current->Exit(&context_length); |
| } |
| EmitReturnSequence(); |
| } |
| |
| void FullCodeGenerator::EmitNewClosure(Handle<SharedFunctionInfo> info, |
| bool pretenure) { |
| // Use the fast case closure allocation code that allocates in new |
| // space for nested functions that don't need literals cloning. If |
| // we're running with the --always-opt or the --prepare-always-opt |
| // flag, we need to use the runtime function so that the new function |
| // we are creating here gets a chance to have its code optimized and |
| // doesn't just get a copy of the existing unoptimized code. |
| if (!FLAG_always_opt && |
| !FLAG_prepare_always_opt && |
| !pretenure && |
| scope()->is_function_scope() && |
| info->num_literals() == 0) { |
| FastNewClosureStub stub(isolate(), info->language_mode(), info->kind()); |
| __ Move(stub.GetCallInterfaceDescriptor().GetRegisterParameter(0), info); |
| __ CallStub(&stub); |
| } else { |
| __ Push(info); |
| __ CallRuntime(pretenure ? Runtime::kNewClosure_Tenured |
| : Runtime::kNewClosure); |
| } |
| context()->Plug(result_register()); |
| } |
| |
| void FullCodeGenerator::EmitNamedPropertyLoad(Property* prop) { |
| SetExpressionPosition(prop); |
| Literal* key = prop->key()->AsLiteral(); |
| DCHECK(!key->value()->IsSmi()); |
| DCHECK(!prop->IsSuperAccess()); |
| |
| __ Move(LoadDescriptor::NameRegister(), key->value()); |
| __ Move(LoadDescriptor::SlotRegister(), |
| SmiFromSlot(prop->PropertyFeedbackSlot())); |
| CallLoadIC(NOT_INSIDE_TYPEOF); |
| } |
| |
| void FullCodeGenerator::EmitNamedSuperPropertyLoad(Property* prop) { |
| // Stack: receiver, home_object |
| SetExpressionPosition(prop); |
| Literal* key = prop->key()->AsLiteral(); |
| DCHECK(!key->value()->IsSmi()); |
| DCHECK(prop->IsSuperAccess()); |
| |
| PushOperand(key->value()); |
| CallRuntimeWithOperands(Runtime::kLoadFromSuper); |
| } |
| |
| void FullCodeGenerator::EmitKeyedPropertyLoad(Property* prop) { |
| SetExpressionPosition(prop); |
| Handle<Code> ic = CodeFactory::KeyedLoadIC(isolate()).code(); |
| __ Move(LoadDescriptor::SlotRegister(), |
| SmiFromSlot(prop->PropertyFeedbackSlot())); |
| CallIC(ic); |
| } |
| |
| void FullCodeGenerator::EmitKeyedSuperPropertyLoad(Property* prop) { |
| // Stack: receiver, home_object, key. |
| SetExpressionPosition(prop); |
| CallRuntimeWithOperands(Runtime::kLoadKeyedFromSuper); |
| } |
| |
| void FullCodeGenerator::EmitPropertyKey(ObjectLiteralProperty* property, |
| BailoutId bailout_id) { |
| VisitForStackValue(property->key()); |
| CallRuntimeWithOperands(Runtime::kToName); |
| PrepareForBailoutForId(bailout_id, BailoutState::NO_REGISTERS); |
| PushOperand(result_register()); |
| } |
| |
| void FullCodeGenerator::EmitLoadStoreICSlot(FeedbackVectorSlot slot) { |
| DCHECK(!slot.IsInvalid()); |
| __ Move(VectorStoreICTrampolineDescriptor::SlotRegister(), SmiFromSlot(slot)); |
| } |
| |
| void FullCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) { |
| Comment cmnt(masm_, "[ ReturnStatement"); |
| SetStatementPosition(stmt); |
| Expression* expr = stmt->expression(); |
| VisitForAccumulatorValue(expr); |
| EmitUnwindAndReturn(); |
| } |
| |
| |
| void FullCodeGenerator::VisitWithStatement(WithStatement* stmt) { |
| Comment cmnt(masm_, "[ WithStatement"); |
| SetStatementPosition(stmt); |
| |
| VisitForAccumulatorValue(stmt->expression()); |
| Callable callable = CodeFactory::ToObject(isolate()); |
| __ Move(callable.descriptor().GetRegisterParameter(0), result_register()); |
| __ Call(callable.code(), RelocInfo::CODE_TARGET); |
| PrepareForBailoutForId(stmt->ToObjectId(), BailoutState::NO_REGISTERS); |
| PushOperand(result_register()); |
| PushFunctionArgumentForContextAllocation(); |
| CallRuntimeWithOperands(Runtime::kPushWithContext); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| PrepareForBailoutForId(stmt->EntryId(), BailoutState::NO_REGISTERS); |
| |
| Scope* saved_scope = scope(); |
| scope_ = stmt->scope(); |
| { WithOrCatch body(this); |
| Visit(stmt->statement()); |
| } |
| scope_ = saved_scope; |
| |
| // Pop context. |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| } |
| |
| |
| void FullCodeGenerator::VisitDoWhileStatement(DoWhileStatement* stmt) { |
| Comment cmnt(masm_, "[ DoWhileStatement"); |
| // Do not insert break location as we do that below. |
| SetStatementPosition(stmt, SKIP_BREAK); |
| |
| Label body, book_keeping; |
| |
| Iteration loop_statement(this, stmt); |
| increment_loop_depth(); |
| |
| __ bind(&body); |
| Visit(stmt->body()); |
| |
| // Record the position of the do while condition and make sure it is |
| // possible to break on the condition. |
| __ bind(loop_statement.continue_label()); |
| PrepareForBailoutForId(stmt->ContinueId(), BailoutState::NO_REGISTERS); |
| |
| // Here is the actual 'while' keyword. |
| SetExpressionAsStatementPosition(stmt->cond()); |
| VisitForControl(stmt->cond(), |
| &book_keeping, |
| loop_statement.break_label(), |
| &book_keeping); |
| |
| // Check stack before looping. |
| PrepareForBailoutForId(stmt->BackEdgeId(), BailoutState::NO_REGISTERS); |
| __ bind(&book_keeping); |
| EmitBackEdgeBookkeeping(stmt, &body); |
| __ jmp(&body); |
| |
| PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitWhileStatement(WhileStatement* stmt) { |
| Comment cmnt(masm_, "[ WhileStatement"); |
| Label loop, body; |
| |
| Iteration loop_statement(this, stmt); |
| increment_loop_depth(); |
| |
| __ bind(&loop); |
| |
| SetExpressionAsStatementPosition(stmt->cond()); |
| VisitForControl(stmt->cond(), |
| &body, |
| loop_statement.break_label(), |
| &body); |
| |
| PrepareForBailoutForId(stmt->BodyId(), BailoutState::NO_REGISTERS); |
| __ bind(&body); |
| Visit(stmt->body()); |
| |
| __ bind(loop_statement.continue_label()); |
| |
| // Check stack before looping. |
| EmitBackEdgeBookkeeping(stmt, &loop); |
| __ jmp(&loop); |
| |
| PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitForStatement(ForStatement* stmt) { |
| Comment cmnt(masm_, "[ ForStatement"); |
| // Do not insert break location as we do it below. |
| SetStatementPosition(stmt, SKIP_BREAK); |
| |
| Label test, body; |
| |
| Iteration loop_statement(this, stmt); |
| |
| if (stmt->init() != NULL) { |
| Visit(stmt->init()); |
| } |
| |
| increment_loop_depth(); |
| // Emit the test at the bottom of the loop (even if empty). |
| __ jmp(&test); |
| |
| PrepareForBailoutForId(stmt->BodyId(), BailoutState::NO_REGISTERS); |
| __ bind(&body); |
| Visit(stmt->body()); |
| |
| PrepareForBailoutForId(stmt->ContinueId(), BailoutState::NO_REGISTERS); |
| __ bind(loop_statement.continue_label()); |
| if (stmt->next() != NULL) { |
| SetStatementPosition(stmt->next()); |
| Visit(stmt->next()); |
| } |
| |
| // Check stack before looping. |
| EmitBackEdgeBookkeeping(stmt, &body); |
| |
| __ bind(&test); |
| if (stmt->cond() != NULL) { |
| SetExpressionAsStatementPosition(stmt->cond()); |
| VisitForControl(stmt->cond(), |
| &body, |
| loop_statement.break_label(), |
| loop_statement.break_label()); |
| } else { |
| __ jmp(&body); |
| } |
| |
| PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitForOfStatement(ForOfStatement* stmt) { |
| Comment cmnt(masm_, "[ ForOfStatement"); |
| |
| Iteration loop_statement(this, stmt); |
| increment_loop_depth(); |
| |
| // var iterator = iterable[Symbol.iterator](); |
| SetExpressionAsStatementPosition(stmt->assign_iterator()); |
| VisitForEffect(stmt->assign_iterator()); |
| |
| // Loop entry. |
| __ bind(loop_statement.continue_label()); |
| |
| // result = iterator.next() |
| SetExpressionAsStatementPosition(stmt->next_result()); |
| VisitForEffect(stmt->next_result()); |
| |
| // if (result.done) break; |
| Label result_not_done; |
| VisitForControl(stmt->result_done(), loop_statement.break_label(), |
| &result_not_done, &result_not_done); |
| __ bind(&result_not_done); |
| |
| // each = result.value |
| VisitForEffect(stmt->assign_each()); |
| |
| // Generate code for the body of the loop. |
| Visit(stmt->body()); |
| |
| // Check stack before looping. |
| PrepareForBailoutForId(stmt->BackEdgeId(), BailoutState::NO_REGISTERS); |
| EmitBackEdgeBookkeeping(stmt, loop_statement.continue_label()); |
| __ jmp(loop_statement.continue_label()); |
| |
| // Exit and decrement the loop depth. |
| PrepareForBailoutForId(stmt->ExitId(), BailoutState::NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| void FullCodeGenerator::VisitThisFunction(ThisFunction* expr) { |
| LoadFromFrameField(JavaScriptFrameConstants::kFunctionOffset, |
| result_register()); |
| context()->Plug(result_register()); |
| } |
| |
| void FullCodeGenerator::VisitTryCatchStatement(TryCatchStatement* stmt) { |
| Comment cmnt(masm_, "[ TryCatchStatement"); |
| SetStatementPosition(stmt, SKIP_BREAK); |
| |
| // The try block adds a handler to the exception handler chain before |
| // entering, and removes it again when exiting normally. If an exception |
| // is thrown during execution of the try block, the handler is consumed |
| // and control is passed to the catch block with the exception in the |
| // result register. |
| |
| Label try_entry, handler_entry, exit; |
| __ jmp(&try_entry); |
| __ bind(&handler_entry); |
| if (stmt->clear_pending_message()) ClearPendingMessage(); |
| |
| // Exception handler code, the exception is in the result register. |
| // Extend the context before executing the catch block. |
| { Comment cmnt(masm_, "[ Extend catch context"); |
| PushOperand(stmt->variable()->name()); |
| PushOperand(result_register()); |
| PushFunctionArgumentForContextAllocation(); |
| CallRuntimeWithOperands(Runtime::kPushCatchContext); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| |
| Scope* saved_scope = scope(); |
| scope_ = stmt->scope(); |
| DCHECK(scope_->declarations()->is_empty()); |
| { WithOrCatch catch_body(this); |
| Visit(stmt->catch_block()); |
| } |
| // Restore the context. |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| scope_ = saved_scope; |
| __ jmp(&exit); |
| |
| // Try block code. Sets up the exception handler chain. |
| __ bind(&try_entry); |
| |
| try_catch_depth_++; |
| int handler_index = NewHandlerTableEntry(); |
| EnterTryBlock(handler_index, &handler_entry); |
| { |
| Comment cmnt_try(masm(), "[ Try block"); |
| Visit(stmt->try_block()); |
| } |
| ExitTryBlock(handler_index); |
| try_catch_depth_--; |
| __ bind(&exit); |
| } |
| |
| |
| void FullCodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* stmt) { |
| Comment cmnt(masm_, "[ TryFinallyStatement"); |
| SetStatementPosition(stmt, SKIP_BREAK); |
| |
| // Try finally is compiled by setting up a try-handler on the stack while |
| // executing the try body, and removing it again afterwards. |
| // |
| // The try-finally construct can enter the finally block in three ways: |
| // 1. By exiting the try-block normally. This exits the try block, |
| // pushes the continuation token and falls through to the finally |
| // block. |
| // 2. By exiting the try-block with a function-local control flow transfer |
| // (break/continue/return). The site of the, e.g., break exits the |
| // try block, pushes the continuation token and jumps to the |
| // finally block. After the finally block executes, the execution |
| // continues based on the continuation token to a block that |
| // continues with the control flow transfer. |
| // 3. By exiting the try-block with a thrown exception. In the handler, |
| // we push the exception and continuation token and jump to the |
| // finally block (which will again dispatch based on the token once |
| // it is finished). |
| |
| Label try_entry, handler_entry, finally_entry; |
| DeferredCommands deferred(this, &finally_entry); |
| |
| // Jump to try-handler setup and try-block code. |
| __ jmp(&try_entry); |
| __ bind(&handler_entry); |
| |
| // Exception handler code. This code is only executed when an exception |
| // is thrown. Record the continuation and jump to the finally block. |
| { |
| Comment cmnt_handler(masm(), "[ Finally handler"); |
| deferred.RecordThrow(); |
| } |
| |
| // Set up try handler. |
| __ bind(&try_entry); |
| int handler_index = NewHandlerTableEntry(); |
| EnterTryBlock(handler_index, &handler_entry); |
| { |
| Comment cmnt_try(masm(), "[ Try block"); |
| TryFinally try_body(this, &deferred); |
| Visit(stmt->try_block()); |
| } |
| ExitTryBlock(handler_index); |
| // Execute the finally block on the way out. Clobber the unpredictable |
| // value in the result register with one that's safe for GC because the |
| // finally block will unconditionally preserve the result register on the |
| // stack. |
| ClearAccumulator(); |
| deferred.EmitFallThrough(); |
| // Fall through to the finally block. |
| |
| // Finally block implementation. |
| __ bind(&finally_entry); |
| { |
| Comment cmnt_finally(masm(), "[ Finally block"); |
| OperandStackDepthIncrement(2); // Token and accumulator are on stack. |
| EnterFinallyBlock(); |
| Visit(stmt->finally_block()); |
| ExitFinallyBlock(); |
| OperandStackDepthDecrement(2); // Token and accumulator were on stack. |
| } |
| |
| { |
| Comment cmnt_deferred(masm(), "[ Post-finally dispatch"); |
| deferred.EmitCommands(); // Return to the calling code. |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitDebuggerStatement(DebuggerStatement* stmt) { |
| Comment cmnt(masm_, "[ DebuggerStatement"); |
| SetStatementPosition(stmt); |
| |
| __ DebugBreak(); |
| // Ignore the return value. |
| |
| PrepareForBailoutForId(stmt->DebugBreakId(), BailoutState::NO_REGISTERS); |
| } |
| |
| |
| void FullCodeGenerator::VisitCaseClause(CaseClause* clause) { |
| UNREACHABLE(); |
| } |
| |
| |
| void FullCodeGenerator::VisitConditional(Conditional* expr) { |
| Comment cmnt(masm_, "[ Conditional"); |
| Label true_case, false_case, done; |
| VisitForControl(expr->condition(), &true_case, &false_case, &true_case); |
| |
| int original_stack_depth = operand_stack_depth_; |
| PrepareForBailoutForId(expr->ThenId(), BailoutState::NO_REGISTERS); |
| __ bind(&true_case); |
| SetExpressionPosition(expr->then_expression()); |
| if (context()->IsTest()) { |
| const TestContext* for_test = TestContext::cast(context()); |
| VisitForControl(expr->then_expression(), |
| for_test->true_label(), |
| for_test->false_label(), |
| NULL); |
| } else { |
| VisitInDuplicateContext(expr->then_expression()); |
| __ jmp(&done); |
| } |
| |
| operand_stack_depth_ = original_stack_depth; |
| PrepareForBailoutForId(expr->ElseId(), BailoutState::NO_REGISTERS); |
| __ bind(&false_case); |
| SetExpressionPosition(expr->else_expression()); |
| VisitInDuplicateContext(expr->else_expression()); |
| // If control flow falls through Visit, merge it with true case here. |
| if (!context()->IsTest()) { |
| __ bind(&done); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitLiteral(Literal* expr) { |
| Comment cmnt(masm_, "[ Literal"); |
| context()->Plug(expr->value()); |
| } |
| |
| |
| void FullCodeGenerator::VisitFunctionLiteral(FunctionLiteral* expr) { |
| Comment cmnt(masm_, "[ FunctionLiteral"); |
| |
| // Build the function boilerplate and instantiate it. |
| Handle<SharedFunctionInfo> function_info = |
| Compiler::GetSharedFunctionInfo(expr, script(), info_); |
| if (function_info.is_null()) { |
| SetStackOverflow(); |
| return; |
| } |
| EmitNewClosure(function_info, expr->pretenure()); |
| } |
| |
| |
| void FullCodeGenerator::VisitClassLiteral(ClassLiteral* lit) { |
| Comment cmnt(masm_, "[ ClassLiteral"); |
| |
| { |
| NestedClassLiteral nested_class_literal(this, lit); |
| EnterBlockScopeIfNeeded block_scope_state( |
| this, lit->scope(), lit->EntryId(), lit->DeclsId(), lit->ExitId()); |
| |
| if (lit->extends() != NULL) { |
| VisitForStackValue(lit->extends()); |
| } else { |
| PushOperand(isolate()->factory()->the_hole_value()); |
| } |
| |
| VisitForStackValue(lit->constructor()); |
| |
| PushOperand(Smi::FromInt(lit->start_position())); |
| PushOperand(Smi::FromInt(lit->end_position())); |
| |
| CallRuntimeWithOperands(Runtime::kDefineClass); |
| PrepareForBailoutForId(lit->CreateLiteralId(), BailoutState::TOS_REGISTER); |
| PushOperand(result_register()); |
| |
| // Load the "prototype" from the constructor. |
| __ Move(LoadDescriptor::ReceiverRegister(), result_register()); |
| __ LoadRoot(LoadDescriptor::NameRegister(), |
| Heap::kprototype_stringRootIndex); |
| __ Move(LoadDescriptor::SlotRegister(), SmiFromSlot(lit->PrototypeSlot())); |
| CallLoadIC(NOT_INSIDE_TYPEOF); |
| PrepareForBailoutForId(lit->PrototypeId(), BailoutState::TOS_REGISTER); |
| PushOperand(result_register()); |
| |
| EmitClassDefineProperties(lit); |
| DropOperands(1); |
| |
| // Set the constructor to have fast properties. |
| CallRuntimeWithOperands(Runtime::kToFastProperties); |
| |
| if (lit->class_variable_proxy() != nullptr) { |
| EmitVariableAssignment(lit->class_variable_proxy()->var(), Token::INIT, |
| lit->ProxySlot()); |
| } |
| } |
| |
| context()->Plug(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::VisitNativeFunctionLiteral( |
| NativeFunctionLiteral* expr) { |
| Comment cmnt(masm_, "[ NativeFunctionLiteral"); |
| Handle<SharedFunctionInfo> shared = |
| Compiler::GetSharedFunctionInfoForNative(expr->extension(), expr->name()); |
| EmitNewClosure(shared, false); |
| } |
| |
| |
| void FullCodeGenerator::VisitThrow(Throw* expr) { |
| Comment cmnt(masm_, "[ Throw"); |
| VisitForStackValue(expr->exception()); |
| SetExpressionPosition(expr); |
| CallRuntimeWithOperands(Runtime::kThrow); |
| // Never returns here. |
| |
| // Even though this expression doesn't produce a value, we need to simulate |
| // plugging of the value context to ensure stack depth tracking is in sync. |
| if (context()->IsStackValue()) OperandStackDepthIncrement(1); |
| } |
| |
| |
| void FullCodeGenerator::EnterTryBlock(int handler_index, Label* handler) { |
| HandlerTableEntry* entry = &handler_table_[handler_index]; |
| entry->range_start = masm()->pc_offset(); |
| entry->handler_offset = handler->pos(); |
| entry->try_catch_depth = try_catch_depth_; |
| entry->stack_depth = operand_stack_depth_; |
| |
| // We are using the operand stack depth, check for accuracy. |
| EmitOperandStackDepthCheck(); |
| |
| // Push context onto operand stack. |
| STATIC_ASSERT(TryBlockConstant::kElementCount == 1); |
| PushOperand(context_register()); |
| } |
| |
| |
| void FullCodeGenerator::ExitTryBlock(int handler_index) { |
| HandlerTableEntry* entry = &handler_table_[handler_index]; |
| entry->range_end = masm()->pc_offset(); |
| |
| // Drop context from operand stack. |
| DropOperands(TryBlockConstant::kElementCount); |
| } |
| |
| |
| void FullCodeGenerator::VisitCall(Call* expr) { |
| #ifdef DEBUG |
| // We want to verify that RecordJSReturnSite gets called on all paths |
| // through this function. Avoid early returns. |
| expr->return_is_recorded_ = false; |
| #endif |
| |
| Comment cmnt(masm_, (expr->tail_call_mode() == TailCallMode::kAllow) |
| ? "[ TailCall" |
| : "[ Call"); |
| Expression* callee = expr->expression(); |
| Call::CallType call_type = expr->GetCallType(isolate()); |
| |
| switch (call_type) { |
| case Call::POSSIBLY_EVAL_CALL: |
| EmitPossiblyEvalCall(expr); |
| break; |
| case Call::GLOBAL_CALL: |
| EmitCallWithLoadIC(expr); |
| break; |
| case Call::LOOKUP_SLOT_CALL: |
| // Call to a lookup slot (dynamically introduced variable). |
| PushCalleeAndWithBaseObject(expr); |
| EmitCall(expr); |
| break; |
| case Call::NAMED_PROPERTY_CALL: { |
| Property* property = callee->AsProperty(); |
| VisitForStackValue(property->obj()); |
| EmitCallWithLoadIC(expr); |
| break; |
| } |
| case Call::KEYED_PROPERTY_CALL: { |
| Property* property = callee->AsProperty(); |
| VisitForStackValue(property->obj()); |
| EmitKeyedCallWithLoadIC(expr, property->key()); |
| break; |
| } |
| case Call::NAMED_SUPER_PROPERTY_CALL: |
| EmitSuperCallWithLoadIC(expr); |
| break; |
| case Call::KEYED_SUPER_PROPERTY_CALL: |
| EmitKeyedSuperCallWithLoadIC(expr); |
| break; |
| case Call::SUPER_CALL: |
| EmitSuperConstructorCall(expr); |
| break; |
| case Call::OTHER_CALL: |
| // Call to an arbitrary expression not handled specially above. |
| VisitForStackValue(callee); |
| OperandStackDepthIncrement(1); |
| __ PushRoot(Heap::kUndefinedValueRootIndex); |
| // Emit function call. |
| EmitCall(expr); |
| break; |
| } |
| |
| #ifdef DEBUG |
| // RecordJSReturnSite should have been called. |
| DCHECK(expr->return_is_recorded_); |
| #endif |
| } |
| |
| void FullCodeGenerator::VisitCallRuntime(CallRuntime* expr) { |
| ZoneList<Expression*>* args = expr->arguments(); |
| int arg_count = args->length(); |
| |
| if (expr->is_jsruntime()) { |
| Comment cmnt(masm_, "[ CallRuntime"); |
| EmitLoadJSRuntimeFunction(expr); |
| |
| // Push the arguments ("left-to-right"). |
| for (int i = 0; i < arg_count; i++) { |
| VisitForStackValue(args->at(i)); |
| } |
| |
| PrepareForBailoutForId(expr->CallId(), BailoutState::NO_REGISTERS); |
| EmitCallJSRuntimeFunction(expr); |
| context()->DropAndPlug(1, result_register()); |
| |
| } else { |
| const Runtime::Function* function = expr->function(); |
| switch (function->function_id) { |
| #define CALL_INTRINSIC_GENERATOR(Name) \ |
| case Runtime::kInline##Name: { \ |
| Comment cmnt(masm_, "[ Inline" #Name); \ |
| return Emit##Name(expr); \ |
| } |
| FOR_EACH_FULL_CODE_INTRINSIC(CALL_INTRINSIC_GENERATOR) |
| #undef CALL_INTRINSIC_GENERATOR |
| default: { |
| Comment cmnt(masm_, "[ CallRuntime for unhandled intrinsic"); |
| // Push the arguments ("left-to-right"). |
| for (int i = 0; i < arg_count; i++) { |
| VisitForStackValue(args->at(i)); |
| } |
| |
| // Call the C runtime function. |
| PrepareForBailoutForId(expr->CallId(), BailoutState::NO_REGISTERS); |
| __ CallRuntime(expr->function(), arg_count); |
| OperandStackDepthDecrement(arg_count); |
| context()->Plug(result_register()); |
| } |
| } |
| } |
| } |
| |
| void FullCodeGenerator::VisitSpread(Spread* expr) { UNREACHABLE(); } |
| |
| |
| void FullCodeGenerator::VisitEmptyParentheses(EmptyParentheses* expr) { |
| UNREACHABLE(); |
| } |
| |
| |
| void FullCodeGenerator::VisitRewritableExpression(RewritableExpression* expr) { |
| Visit(expr->expression()); |
| } |
| |
| FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit( |
| int* context_length) { |
| // The macros used here must preserve the result register. |
| |
| // Calculate how many operands to drop to get down to handler block. |
| int stack_drop = codegen_->operand_stack_depth_ - GetStackDepthAtTarget(); |
| DCHECK_GE(stack_drop, 0); |
| |
| // Because the handler block contains the context of the finally |
| // code, we can restore it directly from there for the finally code |
| // rather than iteratively unwinding contexts via their previous |
| // links. |
| if (*context_length > 0) { |
| __ Drop(stack_drop); // Down to the handler block. |
| // Restore the context to its dedicated register and the stack. |
| STATIC_ASSERT(TryBlockConstant::kElementCount == 1); |
| __ Pop(codegen_->context_register()); |
| codegen_->StoreToFrameField(StandardFrameConstants::kContextOffset, |
| codegen_->context_register()); |
| } else { |
| // Down to the handler block and also drop context. |
| __ Drop(stack_drop + TryBlockConstant::kElementCount); |
| } |
| |
| // The caller will ignore outputs. |
| *context_length = -1; |
| return previous_; |
| } |
| |
| void FullCodeGenerator::DeferredCommands::RecordBreak(Statement* target) { |
| TokenId token = dispenser_.GetBreakContinueToken(); |
| commands_.push_back({kBreak, token, target}); |
| EmitJumpToFinally(token); |
| } |
| |
| void FullCodeGenerator::DeferredCommands::RecordContinue(Statement* target) { |
| TokenId token = dispenser_.GetBreakContinueToken(); |
| commands_.push_back({kContinue, token, target}); |
| EmitJumpToFinally(token); |
| } |
| |
| void FullCodeGenerator::DeferredCommands::RecordReturn() { |
| if (return_token_ == TokenDispenserForFinally::kInvalidToken) { |
| return_token_ = TokenDispenserForFinally::kReturnToken; |
| commands_.push_back({kReturn, return_token_, nullptr}); |
| } |
| EmitJumpToFinally(return_token_); |
| } |
| |
| void FullCodeGenerator::DeferredCommands::RecordThrow() { |
| if (throw_token_ == TokenDispenserForFinally::kInvalidToken) { |
| throw_token_ = TokenDispenserForFinally::kThrowToken; |
| commands_.push_back({kThrow, throw_token_, nullptr}); |
| } |
| EmitJumpToFinally(throw_token_); |
| } |
| |
| void FullCodeGenerator::DeferredCommands::EmitFallThrough() { |
| __ Push(Smi::FromInt(TokenDispenserForFinally::kFallThroughToken)); |
| __ Push(result_register()); |
| } |
| |
| void FullCodeGenerator::DeferredCommands::EmitJumpToFinally(TokenId token) { |
| __ Push(Smi::FromInt(token)); |
| __ Push(result_register()); |
| __ jmp(finally_entry_); |
| } |
| |
| bool FullCodeGenerator::TryLiteralCompare(CompareOperation* expr) { |
| Expression* sub_expr; |
| Handle<String> check; |
| if (expr->IsLiteralCompareTypeof(&sub_expr, &check)) { |
| SetExpressionPosition(expr); |
| EmitLiteralCompareTypeof(expr, sub_expr, check); |
| return true; |
| } |
| |
| if (expr->IsLiteralCompareUndefined(&sub_expr)) { |
| SetExpressionPosition(expr); |
| EmitLiteralCompareNil(expr, sub_expr, kUndefinedValue); |
| return true; |
| } |
| |
| if (expr->IsLiteralCompareNull(&sub_expr)) { |
| SetExpressionPosition(expr); |
| EmitLiteralCompareNil(expr, sub_expr, kNullValue); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| |
| void BackEdgeTable::Patch(Isolate* isolate, Code* unoptimized) { |
| DisallowHeapAllocation no_gc; |
| Code* patch = isolate->builtins()->builtin(Builtins::kOnStackReplacement); |
| |
| // Increment loop nesting level by one and iterate over the back edge table |
| // to find the matching loops to patch the interrupt |
| // call to an unconditional call to the replacement code. |
| int loop_nesting_level = unoptimized->allow_osr_at_loop_nesting_level() + 1; |
| if (loop_nesting_level > Code::kMaxLoopNestingMarker) return; |
| |
| BackEdgeTable back_edges(unoptimized, &no_gc); |
| for (uint32_t i = 0; i < back_edges.length(); i++) { |
| if (static_cast<int>(back_edges.loop_depth(i)) == loop_nesting_level) { |
| DCHECK_EQ(INTERRUPT, GetBackEdgeState(isolate, |
| unoptimized, |
| back_edges.pc(i))); |
| PatchAt(unoptimized, back_edges.pc(i), ON_STACK_REPLACEMENT, patch); |
| } |
| } |
| |
| unoptimized->set_allow_osr_at_loop_nesting_level(loop_nesting_level); |
| DCHECK(Verify(isolate, unoptimized)); |
| } |
| |
| |
| void BackEdgeTable::Revert(Isolate* isolate, Code* unoptimized) { |
| DisallowHeapAllocation no_gc; |
| Code* patch = isolate->builtins()->builtin(Builtins::kInterruptCheck); |
| |
| // Iterate over the back edge table and revert the patched interrupt calls. |
| int loop_nesting_level = unoptimized->allow_osr_at_loop_nesting_level(); |
| |
| BackEdgeTable back_edges(unoptimized, &no_gc); |
| for (uint32_t i = 0; i < back_edges.length(); i++) { |
| if (static_cast<int>(back_edges.loop_depth(i)) <= loop_nesting_level) { |
| DCHECK_NE(INTERRUPT, GetBackEdgeState(isolate, |
| unoptimized, |
| back_edges.pc(i))); |
| PatchAt(unoptimized, back_edges.pc(i), INTERRUPT, patch); |
| } |
| } |
| |
| unoptimized->set_allow_osr_at_loop_nesting_level(0); |
| // Assert that none of the back edges are patched anymore. |
| DCHECK(Verify(isolate, unoptimized)); |
| } |
| |
| |
| #ifdef DEBUG |
| bool BackEdgeTable::Verify(Isolate* isolate, Code* unoptimized) { |
| DisallowHeapAllocation no_gc; |
| int loop_nesting_level = unoptimized->allow_osr_at_loop_nesting_level(); |
| BackEdgeTable back_edges(unoptimized, &no_gc); |
| for (uint32_t i = 0; i < back_edges.length(); i++) { |
| uint32_t loop_depth = back_edges.loop_depth(i); |
| CHECK_LE(static_cast<int>(loop_depth), Code::kMaxLoopNestingMarker); |
| // Assert that all back edges for shallower loops (and only those) |
| // have already been patched. |
| CHECK_EQ((static_cast<int>(loop_depth) <= loop_nesting_level), |
| GetBackEdgeState(isolate, |
| unoptimized, |
| back_edges.pc(i)) != INTERRUPT); |
| } |
| return true; |
| } |
| #endif // DEBUG |
| |
| |
| FullCodeGenerator::EnterBlockScopeIfNeeded::EnterBlockScopeIfNeeded( |
| FullCodeGenerator* codegen, Scope* scope, BailoutId entry_id, |
| BailoutId declarations_id, BailoutId exit_id) |
| : codegen_(codegen), exit_id_(exit_id) { |
| saved_scope_ = codegen_->scope(); |
| |
| if (scope == NULL) { |
| codegen_->PrepareForBailoutForId(entry_id, BailoutState::NO_REGISTERS); |
| needs_block_context_ = false; |
| } else { |
| needs_block_context_ = scope->NeedsContext(); |
| codegen_->scope_ = scope; |
| { |
| if (needs_block_context_) { |
| Comment cmnt(masm(), "[ Extend block context"); |
| codegen_->PushOperand(scope->GetScopeInfo(codegen->isolate())); |
| codegen_->PushFunctionArgumentForContextAllocation(); |
| codegen_->CallRuntimeWithOperands(Runtime::kPushBlockContext); |
| |
| // Replace the context stored in the frame. |
| codegen_->StoreToFrameField(StandardFrameConstants::kContextOffset, |
| codegen_->context_register()); |
| } |
| CHECK_EQ(0, scope->num_stack_slots()); |
| codegen_->PrepareForBailoutForId(entry_id, BailoutState::NO_REGISTERS); |
| } |
| { |
| Comment cmnt(masm(), "[ Declarations"); |
| codegen_->VisitDeclarations(scope->declarations()); |
| codegen_->PrepareForBailoutForId(declarations_id, |
| BailoutState::NO_REGISTERS); |
| } |
| } |
| } |
| |
| |
| FullCodeGenerator::EnterBlockScopeIfNeeded::~EnterBlockScopeIfNeeded() { |
| if (needs_block_context_) { |
| codegen_->LoadContextField(codegen_->context_register(), |
| Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| codegen_->StoreToFrameField(StandardFrameConstants::kContextOffset, |
| codegen_->context_register()); |
| } |
| codegen_->PrepareForBailoutForId(exit_id_, BailoutState::NO_REGISTERS); |
| codegen_->scope_ = saved_scope_; |
| } |
| |
| |
| bool FullCodeGenerator::NeedsHoleCheckForLoad(VariableProxy* proxy) { |
| Variable* var = proxy->var(); |
| |
| if (!var->binding_needs_init()) { |
| return false; |
| } |
| |
| // var->scope() may be NULL when the proxy is located in eval code and |
| // refers to a potential outside binding. Currently those bindings are |
| // always looked up dynamically, i.e. in that case |
| // var->location() == LOOKUP. |
| // always holds. |
| DCHECK(var->scope() != NULL); |
| DCHECK(var->location() == VariableLocation::PARAMETER || |
| var->location() == VariableLocation::LOCAL || |
| var->location() == VariableLocation::CONTEXT); |
| |
| // Check if the binding really needs an initialization check. The check |
| // can be skipped in the following situation: we have a LET or CONST |
| // binding in harmony mode, both the Variable and the VariableProxy have |
| // the same declaration scope (i.e. they are both in global code, in the |
| // same function or in the same eval code), the VariableProxy is in |
| // the source physically located after the initializer of the variable, |
| // and that the initializer cannot be skipped due to a nonlinear scope. |
| // |
| // We cannot skip any initialization checks for CONST in non-harmony |
| // mode because const variables may be declared but never initialized: |
| // if (false) { const x; }; var y = x; |
| // |
| // The condition on the declaration scopes is a conservative check for |
| // nested functions that access a binding and are called before the |
| // binding is initialized: |
| // function() { f(); let x = 1; function f() { x = 2; } } |
| // |
| // The check cannot be skipped on non-linear scopes, namely switch |
| // scopes, to ensure tests are done in cases like the following: |
| // switch (1) { case 0: let x = 2; case 1: f(x); } |
| // The scope of the variable needs to be checked, in case the use is |
| // in a sub-block which may be linear. |
| if (var->scope()->DeclarationScope() != scope()->DeclarationScope()) { |
| return true; |
| } |
| |
| if (var->is_this()) { |
| DCHECK(literal() != nullptr && |
| (literal()->kind() & kSubclassConstructor) != 0); |
| // TODO(littledan): implement 'this' hole check elimination. |
| return true; |
| } |
| |
| // Check that we always have valid source position. |
| DCHECK(var->initializer_position() != RelocInfo::kNoPosition); |
| DCHECK(proxy->position() != RelocInfo::kNoPosition); |
| |
| return var->scope()->is_nonlinear() || |
| var->initializer_position() >= proxy->position(); |
| } |
| |
| |
| #undef __ |
| |
| |
| } // namespace internal |
| } // namespace v8 |