| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "codegen.h" |
| #include "compiler.h" |
| #include "debug.h" |
| #include "full-codegen.h" |
| #include "liveedit.h" |
| #include "macro-assembler.h" |
| #include "prettyprinter.h" |
| #include "scopes.h" |
| #include "scopeinfo.h" |
| #include "snapshot.h" |
| #include "stub-cache.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| void BreakableStatementChecker::Check(Statement* stmt) { |
| Visit(stmt); |
| } |
| |
| |
| void BreakableStatementChecker::Check(Expression* expr) { |
| Visit(expr); |
| } |
| |
| |
| void BreakableStatementChecker::VisitVariableDeclaration( |
| VariableDeclaration* decl) { |
| } |
| |
| void BreakableStatementChecker::VisitFunctionDeclaration( |
| FunctionDeclaration* decl) { |
| } |
| |
| void BreakableStatementChecker::VisitModuleDeclaration( |
| ModuleDeclaration* decl) { |
| } |
| |
| void BreakableStatementChecker::VisitImportDeclaration( |
| ImportDeclaration* decl) { |
| } |
| |
| void BreakableStatementChecker::VisitExportDeclaration( |
| ExportDeclaration* decl) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitModuleLiteral(ModuleLiteral* module) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitModuleVariable(ModuleVariable* module) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitModulePath(ModulePath* module) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitModuleUrl(ModuleUrl* module) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitModuleStatement(ModuleStatement* stmt) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitBlock(Block* stmt) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitExpressionStatement( |
| ExpressionStatement* stmt) { |
| // Check if expression is breakable. |
| Visit(stmt->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitEmptyStatement(EmptyStatement* stmt) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitIfStatement(IfStatement* stmt) { |
| // If the condition is breakable the if statement is breakable. |
| Visit(stmt->condition()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitContinueStatement( |
| ContinueStatement* stmt) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitBreakStatement(BreakStatement* stmt) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitReturnStatement(ReturnStatement* stmt) { |
| // Return is breakable if the expression is. |
| Visit(stmt->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitWithStatement(WithStatement* stmt) { |
| Visit(stmt->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitSwitchStatement(SwitchStatement* stmt) { |
| // Switch statements breakable if the tag expression is. |
| Visit(stmt->tag()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitDoWhileStatement(DoWhileStatement* stmt) { |
| // Mark do while as breakable to avoid adding a break slot in front of it. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitWhileStatement(WhileStatement* stmt) { |
| // Mark while statements breakable if the condition expression is. |
| Visit(stmt->cond()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitForStatement(ForStatement* stmt) { |
| // Mark for statements breakable if the condition expression is. |
| if (stmt->cond() != NULL) { |
| Visit(stmt->cond()); |
| } |
| } |
| |
| |
| void BreakableStatementChecker::VisitForInStatement(ForInStatement* stmt) { |
| // Mark for in statements breakable if the enumerable expression is. |
| Visit(stmt->enumerable()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitForOfStatement(ForOfStatement* stmt) { |
| // For-of is breakable because of the next() call. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitTryCatchStatement( |
| TryCatchStatement* stmt) { |
| // Mark try catch as breakable to avoid adding a break slot in front of it. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitTryFinallyStatement( |
| TryFinallyStatement* stmt) { |
| // Mark try finally as breakable to avoid adding a break slot in front of it. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitDebuggerStatement( |
| DebuggerStatement* stmt) { |
| // The debugger statement is breakable. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitFunctionLiteral(FunctionLiteral* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitSharedFunctionInfoLiteral( |
| SharedFunctionInfoLiteral* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitConditional(Conditional* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitVariableProxy(VariableProxy* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitLiteral(Literal* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitRegExpLiteral(RegExpLiteral* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitObjectLiteral(ObjectLiteral* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitArrayLiteral(ArrayLiteral* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitAssignment(Assignment* expr) { |
| // If assigning to a property (including a global property) the assignment is |
| // breakable. |
| VariableProxy* proxy = expr->target()->AsVariableProxy(); |
| Property* prop = expr->target()->AsProperty(); |
| if (prop != NULL || (proxy != NULL && proxy->var()->IsUnallocated())) { |
| is_breakable_ = true; |
| return; |
| } |
| |
| // Otherwise the assignment is breakable if the assigned value is. |
| Visit(expr->value()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitYield(Yield* expr) { |
| // Yield is breakable if the expression is. |
| Visit(expr->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitThrow(Throw* expr) { |
| // Throw is breakable if the expression is. |
| Visit(expr->exception()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitProperty(Property* expr) { |
| // Property load is breakable. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitCall(Call* expr) { |
| // Function calls both through IC and call stub are breakable. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitCallNew(CallNew* expr) { |
| // Function calls through new are breakable. |
| is_breakable_ = true; |
| } |
| |
| |
| void BreakableStatementChecker::VisitCallRuntime(CallRuntime* expr) { |
| } |
| |
| |
| void BreakableStatementChecker::VisitUnaryOperation(UnaryOperation* expr) { |
| Visit(expr->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitCountOperation(CountOperation* expr) { |
| Visit(expr->expression()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitBinaryOperation(BinaryOperation* expr) { |
| Visit(expr->left()); |
| if (expr->op() != Token::AND && |
| expr->op() != Token::OR) { |
| Visit(expr->right()); |
| } |
| } |
| |
| |
| void BreakableStatementChecker::VisitCompareOperation(CompareOperation* expr) { |
| Visit(expr->left()); |
| Visit(expr->right()); |
| } |
| |
| |
| void BreakableStatementChecker::VisitThisFunction(ThisFunction* expr) { |
| } |
| |
| |
| #define __ ACCESS_MASM(masm()) |
| |
| bool FullCodeGenerator::MakeCode(CompilationInfo* info) { |
| Isolate* isolate = info->isolate(); |
| 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); |
| #ifdef ENABLE_GDB_JIT_INTERFACE |
| masm.positions_recorder()->StartGDBJITLineInfoRecording(); |
| #endif |
| LOG_CODE_EVENT(isolate, |
| CodeStartLinePosInfoRecordEvent(masm.positions_recorder())); |
| |
| FullCodeGenerator cgen(&masm, info); |
| cgen.Generate(); |
| if (cgen.HasStackOverflow()) { |
| ASSERT(!isolate->has_pending_exception()); |
| return false; |
| } |
| unsigned table_offset = cgen.EmitBackEdgeTable(); |
| |
| Code::Flags flags = Code::ComputeFlags(Code::FUNCTION); |
| Handle<Code> code = CodeGenerator::MakeCodeEpilogue(&masm, flags, info); |
| code->set_optimizable(info->IsOptimizable() && |
| !info->function()->flags()->Contains(kDontOptimize) && |
| info->function()->scope()->AllowsLazyCompilation()); |
| cgen.PopulateDeoptimizationData(code); |
| cgen.PopulateTypeFeedbackInfo(code); |
| cgen.PopulateTypeFeedbackCells(code); |
| code->set_has_deoptimization_support(info->HasDeoptimizationSupport()); |
| code->set_handler_table(*cgen.handler_table()); |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| code->set_has_debug_break_slots( |
| info->isolate()->debugger()->IsDebuggerActive()); |
| code->set_compiled_optimizable(info->IsOptimizable()); |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| code->set_allow_osr_at_loop_nesting_level(0); |
| code->set_profiler_ticks(0); |
| code->set_back_edge_table_offset(table_offset); |
| code->set_back_edges_patched_for_osr(false); |
| CodeGenerator::PrintCode(code, info); |
| info->SetCode(code); // May be an empty handle. |
| #ifdef ENABLE_GDB_JIT_INTERFACE |
| if (FLAG_gdbjit && !code.is_null()) { |
| GDBJITLineInfo* lineinfo = |
| masm.positions_recorder()->DetachGDBJITLineInfo(); |
| |
| GDBJIT(RegisterDetailedLineInfo(*code, lineinfo)); |
| } |
| #endif |
| if (!code.is_null()) { |
| void* line_info = |
| masm.positions_recorder()->DetachJITHandlerData(); |
| LOG_CODE_EVENT(isolate, CodeEndLinePosInfoRecordEvent(*code, line_info)); |
| } |
| return !code.is_null(); |
| } |
| |
| |
| 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(kIntSize); |
| 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); |
| __ db(back_edges_[i].loop_depth); |
| } |
| return offset; |
| } |
| |
| |
| void FullCodeGenerator::PopulateDeoptimizationData(Handle<Code> code) { |
| // Fill in the deoptimization information. |
| ASSERT(info_->HasDeoptimizationSupport() || bailout_entries_.is_empty()); |
| if (!info_->HasDeoptimizationSupport()) return; |
| int length = bailout_entries_.length(); |
| Handle<DeoptimizationOutputData> data = isolate()->factory()-> |
| NewDeoptimizationOutputData(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_); |
| ASSERT(!isolate()->heap()->InNewSpace(*info)); |
| code->set_type_feedback_info(*info); |
| } |
| |
| |
| void FullCodeGenerator::Initialize() { |
| // The generation of debug code must match between the snapshot code and the |
| // code that is generated later. This is assumed by the debugger when it is |
| // calculating PC offsets after generating a debug version of code. Therefore |
| // we disable the production of debug code in the full compiler if we are |
| // either generating a snapshot or we booted from a snapshot. |
| generate_debug_code_ = FLAG_debug_code && |
| !Serializer::enabled() && |
| !Snapshot::HaveASnapshotToStartFrom(); |
| masm_->set_emit_debug_code(generate_debug_code_); |
| masm_->set_predictable_code_size(true); |
| InitializeAstVisitor(); |
| } |
| |
| |
| void FullCodeGenerator::PopulateTypeFeedbackCells(Handle<Code> code) { |
| if (type_feedback_cells_.is_empty()) return; |
| int length = type_feedback_cells_.length(); |
| int array_size = TypeFeedbackCells::LengthOfFixedArray(length); |
| Handle<TypeFeedbackCells> cache = Handle<TypeFeedbackCells>::cast( |
| isolate()->factory()->NewFixedArray(array_size, TENURED)); |
| for (int i = 0; i < length; i++) { |
| cache->SetAstId(i, type_feedback_cells_[i].ast_id); |
| cache->SetCell(i, *type_feedback_cells_[i].cell); |
| } |
| TypeFeedbackInfo::cast(code->type_feedback_info())->set_type_feedback_cells( |
| *cache); |
| } |
| |
| |
| |
| void FullCodeGenerator::PrepareForBailout(Expression* node, State state) { |
| PrepareForBailoutForId(node->id(), state); |
| } |
| |
| |
| 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 state is ignored. We defensively set it to TOS_REG, which is the |
| // real state of the unoptimized code at the return site. |
| PrepareForBailoutForId(call->ReturnId(), TOS_REG); |
| #ifdef DEBUG |
| // In debug builds, mark the return so we can verify that this function |
| // was called. |
| ASSERT(!call->return_is_recorded_); |
| call->return_is_recorded_ = true; |
| #endif |
| } |
| |
| |
| void FullCodeGenerator::PrepareForBailoutForId(BailoutId id, State 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 = |
| StateField::encode(state) | PcField::encode(masm_->pc_offset()); |
| ASSERT(Smi::IsValid(pc_and_state)); |
| BailoutEntry entry = { id, pc_and_state }; |
| ASSERT(!prepared_bailout_ids_.Contains(id.ToInt())); |
| prepared_bailout_ids_.Add(id.ToInt(), zone()); |
| bailout_entries_.Add(entry, zone()); |
| } |
| |
| |
| void FullCodeGenerator::RecordTypeFeedbackCell( |
| TypeFeedbackId id, Handle<Cell> cell) { |
| TypeFeedbackCellEntry entry = { id, cell }; |
| type_feedback_cells_.Add(entry, zone()); |
| } |
| |
| |
| void FullCodeGenerator::RecordBackEdge(BailoutId ast_id) { |
| // The pc offset does not need to be encoded and packed together with a state. |
| ASSERT(masm_->pc_offset() > 0); |
| ASSERT(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(Register reg) const { |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::Plug(Register reg) const { |
| __ Move(result_register(), reg); |
| } |
| |
| |
| void FullCodeGenerator::StackValueContext::Plug(Register reg) const { |
| __ push(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::PlugTOS() const { |
| __ Drop(1); |
| } |
| |
| |
| void FullCodeGenerator::AccumulatorValueContext::PlugTOS() const { |
| __ pop(result_register()); |
| } |
| |
| |
| void FullCodeGenerator::StackValueContext::PlugTOS() const { |
| } |
| |
| |
| void FullCodeGenerator::TestContext::PlugTOS() const { |
| // For simplicity we always test the accumulator register. |
| __ pop(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::AllocateModules(ZoneList<Declaration*>* declarations) { |
| ASSERT(scope_->is_global_scope()); |
| |
| for (int i = 0; i < declarations->length(); i++) { |
| ModuleDeclaration* declaration = declarations->at(i)->AsModuleDeclaration(); |
| if (declaration != NULL) { |
| ModuleLiteral* module = declaration->module()->AsModuleLiteral(); |
| if (module != NULL) { |
| Comment cmnt(masm_, "[ Link nested modules"); |
| Scope* scope = module->body()->scope(); |
| Interface* interface = scope->interface(); |
| ASSERT(interface->IsModule() && interface->IsFrozen()); |
| |
| interface->Allocate(scope->module_var()->index()); |
| |
| // Set up module context. |
| ASSERT(scope->interface()->Index() >= 0); |
| __ Push(Smi::FromInt(scope->interface()->Index())); |
| __ Push(scope->GetScopeInfo()); |
| __ CallRuntime(Runtime::kPushModuleContext, 2); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| |
| AllocateModules(scope->declarations()); |
| |
| // Pop module context. |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| } |
| } |
| } |
| |
| |
| // Modules have their own local scope, represented by their own context. |
| // Module instance objects have an accessor for every export that forwards |
| // access to the respective slot from the module's context. (Exports that are |
| // modules themselves, however, are simple data properties.) |
| // |
| // All modules have a _hosting_ scope/context, which (currently) is the |
| // (innermost) enclosing global scope. To deal with recursion, nested modules |
| // are hosted by the same scope as global ones. |
| // |
| // For every (global or nested) module literal, the hosting context has an |
| // internal slot that points directly to the respective module context. This |
| // enables quick access to (statically resolved) module members by 2-dimensional |
| // access through the hosting context. For example, |
| // |
| // module A { |
| // let x; |
| // module B { let y; } |
| // } |
| // module C { let z; } |
| // |
| // allocates contexts as follows: |
| // |
| // [header| .A | .B | .C | A | C ] (global) |
| // | | | |
| // | | +-- [header| z ] (module) |
| // | | |
| // | +------- [header| y ] (module) |
| // | |
| // +------------ [header| x | B ] (module) |
| // |
| // Here, .A, .B, .C are the internal slots pointing to the hosted module |
| // contexts, whereas A, B, C hold the actual instance objects (note that every |
| // module context also points to the respective instance object through its |
| // extension slot in the header). |
| // |
| // To deal with arbitrary recursion and aliases between modules, |
| // they are created and initialized in several stages. Each stage applies to |
| // all modules in the hosting global scope, including nested ones. |
| // |
| // 1. Allocate: for each module _literal_, allocate the module contexts and |
| // respective instance object and wire them up. This happens in the |
| // PushModuleContext runtime function, as generated by AllocateModules |
| // (invoked by VisitDeclarations in the hosting scope). |
| // |
| // 2. Bind: for each module _declaration_ (i.e. literals as well as aliases), |
| // assign the respective instance object to respective local variables. This |
| // happens in VisitModuleDeclaration, and uses the instance objects created |
| // in the previous stage. |
| // For each module _literal_, this phase also constructs a module descriptor |
| // for the next stage. This happens in VisitModuleLiteral. |
| // |
| // 3. Populate: invoke the DeclareModules runtime function to populate each |
| // _instance_ object with accessors for it exports. This is generated by |
| // DeclareModules (invoked by VisitDeclarations in the hosting scope again), |
| // and uses the descriptors generated in the previous stage. |
| // |
| // 4. Initialize: execute the module bodies (and other code) in sequence. This |
| // happens by the separate statements generated for module bodies. To reenter |
| // the module scopes properly, the parser inserted ModuleStatements. |
| |
| void FullCodeGenerator::VisitDeclarations( |
| ZoneList<Declaration*>* declarations) { |
| Handle<FixedArray> saved_modules = modules_; |
| int saved_module_index = module_index_; |
| ZoneList<Handle<Object> >* saved_globals = globals_; |
| ZoneList<Handle<Object> > inner_globals(10, zone()); |
| globals_ = &inner_globals; |
| |
| if (scope_->num_modules() != 0) { |
| // This is a scope hosting modules. Allocate a descriptor array to pass |
| // to the runtime for initialization. |
| Comment cmnt(masm_, "[ Allocate modules"); |
| ASSERT(scope_->is_global_scope()); |
| modules_ = |
| isolate()->factory()->NewFixedArray(scope_->num_modules(), TENURED); |
| module_index_ = 0; |
| |
| // Generate code for allocating all modules, including nested ones. |
| // The allocated contexts are stored in internal variables in this scope. |
| AllocateModules(declarations); |
| } |
| |
| AstVisitor::VisitDeclarations(declarations); |
| |
| if (scope_->num_modules() != 0) { |
| // Initialize modules from descriptor array. |
| ASSERT(module_index_ == modules_->length()); |
| DeclareModules(modules_); |
| modules_ = saved_modules; |
| module_index_ = saved_module_index; |
| } |
| |
| 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::VisitModuleLiteral(ModuleLiteral* module) { |
| Block* block = module->body(); |
| Scope* saved_scope = scope(); |
| scope_ = block->scope(); |
| Interface* interface = scope_->interface(); |
| |
| Comment cmnt(masm_, "[ ModuleLiteral"); |
| SetStatementPosition(block); |
| |
| ASSERT(!modules_.is_null()); |
| ASSERT(module_index_ < modules_->length()); |
| int index = module_index_++; |
| |
| // Set up module context. |
| ASSERT(interface->Index() >= 0); |
| __ Push(Smi::FromInt(interface->Index())); |
| __ Push(Smi::FromInt(0)); |
| __ CallRuntime(Runtime::kPushModuleContext, 2); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| |
| { |
| Comment cmnt(masm_, "[ Declarations"); |
| VisitDeclarations(scope_->declarations()); |
| } |
| |
| // Populate the module description. |
| Handle<ModuleInfo> description = |
| ModuleInfo::Create(isolate(), interface, scope_); |
| modules_->set(index, *description); |
| |
| scope_ = saved_scope; |
| // Pop module context. |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| } |
| |
| |
| void FullCodeGenerator::VisitModuleVariable(ModuleVariable* module) { |
| // Nothing to do. |
| // The instance object is resolved statically through the module's interface. |
| } |
| |
| |
| void FullCodeGenerator::VisitModulePath(ModulePath* module) { |
| // Nothing to do. |
| // The instance object is resolved statically through the module's interface. |
| } |
| |
| |
| void FullCodeGenerator::VisitModuleUrl(ModuleUrl* module) { |
| // TODO(rossberg): dummy allocation for now. |
| Scope* scope = module->body()->scope(); |
| Interface* interface = scope_->interface(); |
| |
| ASSERT(interface->IsModule() && interface->IsFrozen()); |
| ASSERT(!modules_.is_null()); |
| ASSERT(module_index_ < modules_->length()); |
| interface->Allocate(scope->module_var()->index()); |
| int index = module_index_++; |
| |
| Handle<ModuleInfo> description = |
| ModuleInfo::Create(isolate(), interface, scope_); |
| modules_->set(index, *description); |
| } |
| |
| |
| int FullCodeGenerator::DeclareGlobalsFlags() { |
| ASSERT(DeclareGlobalsLanguageMode::is_valid(language_mode())); |
| return DeclareGlobalsEvalFlag::encode(is_eval()) | |
| DeclareGlobalsNativeFlag::encode(is_native()) | |
| DeclareGlobalsLanguageMode::encode(language_mode()); |
| } |
| |
| |
| void FullCodeGenerator::SetFunctionPosition(FunctionLiteral* fun) { |
| CodeGenerator::RecordPositions(masm_, fun->start_position()); |
| } |
| |
| |
| void FullCodeGenerator::SetReturnPosition(FunctionLiteral* fun) { |
| CodeGenerator::RecordPositions(masm_, fun->end_position() - 1); |
| } |
| |
| |
| void FullCodeGenerator::SetStatementPosition(Statement* stmt) { |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| if (!isolate()->debugger()->IsDebuggerActive()) { |
| CodeGenerator::RecordPositions(masm_, stmt->statement_pos()); |
| } else { |
| // Check if the statement will be breakable without adding a debug break |
| // slot. |
| BreakableStatementChecker checker; |
| checker.Check(stmt); |
| // Record the statement position right here if the statement is not |
| // breakable. For breakable statements the actual recording of the |
| // position will be postponed to the breakable code (typically an IC). |
| bool position_recorded = CodeGenerator::RecordPositions( |
| masm_, stmt->statement_pos(), !checker.is_breakable()); |
| // If the position recording did record a new position generate a debug |
| // break slot to make the statement breakable. |
| if (position_recorded) { |
| Debug::GenerateSlot(masm_); |
| } |
| } |
| #else |
| CodeGenerator::RecordPositions(masm_, stmt->statement_pos()); |
| #endif |
| } |
| |
| |
| void FullCodeGenerator::SetExpressionPosition(Expression* expr, int pos) { |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| if (!isolate()->debugger()->IsDebuggerActive()) { |
| CodeGenerator::RecordPositions(masm_, pos); |
| } else { |
| // Check if the expression will be breakable without adding a debug break |
| // slot. |
| BreakableStatementChecker checker; |
| checker.Check(expr); |
| // Record a statement position right here if the expression is not |
| // breakable. For breakable expressions the actual recording of the |
| // position will be postponed to the breakable code (typically an IC). |
| // NOTE this will record a statement position for something which might |
| // not be a statement. As stepping in the debugger will only stop at |
| // statement positions this is used for e.g. the condition expression of |
| // a do while loop. |
| bool position_recorded = CodeGenerator::RecordPositions( |
| masm_, pos, !checker.is_breakable()); |
| // If the position recording did record a new position generate a debug |
| // break slot to make the statement breakable. |
| if (position_recorded) { |
| Debug::GenerateSlot(masm_); |
| } |
| } |
| #else |
| CodeGenerator::RecordPositions(masm_, pos); |
| #endif |
| } |
| |
| |
| void FullCodeGenerator::SetStatementPosition(int pos) { |
| CodeGenerator::RecordPositions(masm_, pos); |
| } |
| |
| |
| void FullCodeGenerator::SetSourcePosition(int pos) { |
| if (pos != RelocInfo::kNoPosition) { |
| masm_->positions_recorder()->RecordPosition(pos); |
| } |
| } |
| |
| |
| // Lookup table for code generators for special runtime calls which are |
| // generated inline. |
| #define INLINE_FUNCTION_GENERATOR_ADDRESS(Name, argc, ressize) \ |
| &FullCodeGenerator::Emit##Name, |
| |
| const FullCodeGenerator::InlineFunctionGenerator |
| FullCodeGenerator::kInlineFunctionGenerators[] = { |
| INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS) |
| INLINE_RUNTIME_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS) |
| }; |
| #undef INLINE_FUNCTION_GENERATOR_ADDRESS |
| |
| |
| FullCodeGenerator::InlineFunctionGenerator |
| FullCodeGenerator::FindInlineFunctionGenerator(Runtime::FunctionId id) { |
| int lookup_index = |
| static_cast<int>(id) - static_cast<int>(Runtime::kFirstInlineFunction); |
| ASSERT(lookup_index >= 0); |
| ASSERT(static_cast<size_t>(lookup_index) < |
| ARRAY_SIZE(kInlineFunctionGenerators)); |
| return kInlineFunctionGenerators[lookup_index]; |
| } |
| |
| |
| void FullCodeGenerator::EmitInlineRuntimeCall(CallRuntime* expr) { |
| const Runtime::Function* function = expr->function(); |
| ASSERT(function != NULL); |
| ASSERT(function->intrinsic_type == Runtime::INLINE); |
| InlineFunctionGenerator generator = |
| FindInlineFunctionGenerator(function->function_id); |
| ((*this).*(generator))(expr); |
| } |
| |
| |
| void FullCodeGenerator::EmitGeneratorNext(CallRuntime* expr) { |
| ZoneList<Expression*>* args = expr->arguments(); |
| ASSERT(args->length() == 2); |
| EmitGeneratorResume(args->at(0), args->at(1), JSGeneratorObject::NEXT); |
| } |
| |
| |
| void FullCodeGenerator::EmitGeneratorThrow(CallRuntime* expr) { |
| ZoneList<Expression*>* args = expr->arguments(); |
| ASSERT(args->length() == 2); |
| EmitGeneratorResume(args->at(0), args->at(1), JSGeneratorObject::THROW); |
| } |
| |
| |
| 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, 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, 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, NO_REGISTERS); |
| |
| } else { |
| ASSERT(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, 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(); |
| OverwriteMode mode = |
| left->ResultOverwriteAllowed() |
| ? OVERWRITE_LEFT |
| : (right->ResultOverwriteAllowed() ? OVERWRITE_RIGHT : NO_OVERWRITE); |
| |
| VisitForStackValue(left); |
| VisitForAccumulatorValue(right); |
| |
| SetSourcePosition(expr->position()); |
| if (ShouldInlineSmiCase(op)) { |
| EmitInlineSmiBinaryOp(expr, op, mode, left, right); |
| } else { |
| EmitBinaryOp(expr, op, mode); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitBlock(Block* stmt) { |
| Comment cmnt(masm_, "[ Block"); |
| NestedBlock nested_block(this, stmt); |
| SetStatementPosition(stmt); |
| |
| Scope* saved_scope = scope(); |
| // Push a block context when entering a block with block scoped variables. |
| if (stmt->scope() != NULL) { |
| scope_ = stmt->scope(); |
| ASSERT(!scope_->is_module_scope()); |
| { Comment cmnt(masm_, "[ Extend block context"); |
| Handle<ScopeInfo> scope_info = scope_->GetScopeInfo(); |
| int heap_slots = scope_info->ContextLength() - Context::MIN_CONTEXT_SLOTS; |
| __ Push(scope_info); |
| PushFunctionArgumentForContextAllocation(); |
| if (heap_slots <= FastNewBlockContextStub::kMaximumSlots) { |
| FastNewBlockContextStub stub(heap_slots); |
| __ CallStub(&stub); |
| } else { |
| __ CallRuntime(Runtime::kPushBlockContext, 2); |
| } |
| |
| // Replace the context stored in the frame. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| { Comment cmnt(masm_, "[ Declarations"); |
| VisitDeclarations(scope_->declarations()); |
| } |
| } |
| |
| PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS); |
| VisitStatements(stmt->statements()); |
| scope_ = saved_scope; |
| __ bind(nested_block.break_label()); |
| PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS); |
| |
| // Pop block context if necessary. |
| if (stmt->scope() != NULL) { |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| } |
| |
| |
| void FullCodeGenerator::VisitModuleStatement(ModuleStatement* stmt) { |
| Comment cmnt(masm_, "[ Module context"); |
| |
| __ Push(Smi::FromInt(stmt->proxy()->interface()->Index())); |
| __ Push(Smi::FromInt(0)); |
| __ CallRuntime(Runtime::kPushModuleContext, 2); |
| StoreToFrameField( |
| StandardFrameConstants::kContextOffset, context_register()); |
| |
| Scope* saved_scope = scope_; |
| scope_ = stmt->body()->scope(); |
| VisitStatements(stmt->body()->statements()); |
| scope_ = saved_scope; |
| LoadContextField(context_register(), Context::PREVIOUS_INDEX); |
| // Update local stack frame context field. |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| |
| |
| void FullCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) { |
| Comment cmnt(masm_, "[ ExpressionStatement"); |
| SetStatementPosition(stmt); |
| VisitForEffect(stmt->expression()); |
| } |
| |
| |
| void FullCodeGenerator::VisitEmptyStatement(EmptyStatement* stmt) { |
| Comment cmnt(masm_, "[ EmptyStatement"); |
| SetStatementPosition(stmt); |
| } |
| |
| |
| 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(), NO_REGISTERS); |
| __ bind(&then_part); |
| Visit(stmt->then_statement()); |
| __ jmp(&done); |
| |
| PrepareForBailoutForId(stmt->ElseId(), NO_REGISTERS); |
| __ bind(&else_part); |
| Visit(stmt->else_statement()); |
| } else { |
| VisitForControl(stmt->condition(), &then_part, &done, &then_part); |
| PrepareForBailoutForId(stmt->ThenId(), NO_REGISTERS); |
| __ bind(&then_part); |
| Visit(stmt->then_statement()); |
| |
| PrepareForBailoutForId(stmt->ElseId(), NO_REGISTERS); |
| } |
| __ bind(&done); |
| PrepareForBailoutForId(stmt->IfId(), NO_REGISTERS); |
| } |
| |
| |
| void FullCodeGenerator::VisitContinueStatement(ContinueStatement* stmt) { |
| Comment cmnt(masm_, "[ ContinueStatement"); |
| SetStatementPosition(stmt); |
| NestedStatement* current = nesting_stack_; |
| int stack_depth = 0; |
| 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(stmt->target())) { |
| current = current->Exit(&stack_depth, &context_length); |
| } |
| __ Drop(stack_depth); |
| 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::VisitBreakStatement(BreakStatement* stmt) { |
| Comment cmnt(masm_, "[ BreakStatement"); |
| SetStatementPosition(stmt); |
| NestedStatement* current = nesting_stack_; |
| int stack_depth = 0; |
| 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(stmt->target())) { |
| current = current->Exit(&stack_depth, &context_length); |
| } |
| __ Drop(stack_depth); |
| 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::EmitUnwindBeforeReturn() { |
| NestedStatement* current = nesting_stack_; |
| int stack_depth = 0; |
| int context_length = 0; |
| while (current != NULL) { |
| current = current->Exit(&stack_depth, &context_length); |
| } |
| __ Drop(stack_depth); |
| } |
| |
| |
| void FullCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) { |
| Comment cmnt(masm_, "[ ReturnStatement"); |
| SetStatementPosition(stmt); |
| Expression* expr = stmt->expression(); |
| VisitForAccumulatorValue(expr); |
| EmitUnwindBeforeReturn(); |
| EmitReturnSequence(); |
| } |
| |
| |
| void FullCodeGenerator::VisitWithStatement(WithStatement* stmt) { |
| Comment cmnt(masm_, "[ WithStatement"); |
| SetStatementPosition(stmt); |
| |
| VisitForStackValue(stmt->expression()); |
| PushFunctionArgumentForContextAllocation(); |
| __ CallRuntime(Runtime::kPushWithContext, 2); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, context_register()); |
| |
| 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"); |
| SetStatementPosition(stmt); |
| 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(), NO_REGISTERS); |
| SetExpressionPosition(stmt->cond(), stmt->condition_position()); |
| VisitForControl(stmt->cond(), |
| &book_keeping, |
| loop_statement.break_label(), |
| &book_keeping); |
| |
| // Check stack before looping. |
| PrepareForBailoutForId(stmt->BackEdgeId(), NO_REGISTERS); |
| __ bind(&book_keeping); |
| EmitBackEdgeBookkeeping(stmt, &body); |
| __ jmp(&body); |
| |
| PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitWhileStatement(WhileStatement* stmt) { |
| Comment cmnt(masm_, "[ WhileStatement"); |
| Label test, body; |
| |
| Iteration loop_statement(this, stmt); |
| increment_loop_depth(); |
| |
| // Emit the test at the bottom of the loop. |
| __ jmp(&test); |
| |
| PrepareForBailoutForId(stmt->BodyId(), NO_REGISTERS); |
| __ bind(&body); |
| Visit(stmt->body()); |
| |
| // Emit the statement position here as this is where the while |
| // statement code starts. |
| __ bind(loop_statement.continue_label()); |
| SetStatementPosition(stmt); |
| |
| // Check stack before looping. |
| EmitBackEdgeBookkeeping(stmt, &body); |
| |
| __ bind(&test); |
| VisitForControl(stmt->cond(), |
| &body, |
| loop_statement.break_label(), |
| loop_statement.break_label()); |
| |
| PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitForStatement(ForStatement* stmt) { |
| Comment cmnt(masm_, "[ ForStatement"); |
| Label test, body; |
| |
| Iteration loop_statement(this, stmt); |
| |
| // Set statement position for a break slot before entering the for-body. |
| SetStatementPosition(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(), NO_REGISTERS); |
| __ bind(&body); |
| Visit(stmt->body()); |
| |
| PrepareForBailoutForId(stmt->ContinueId(), NO_REGISTERS); |
| __ bind(loop_statement.continue_label()); |
| if (stmt->next() != NULL) { |
| Visit(stmt->next()); |
| } |
| |
| // Emit the statement position here as this is where the for |
| // statement code starts. |
| SetStatementPosition(stmt); |
| |
| // Check stack before looping. |
| EmitBackEdgeBookkeeping(stmt, &body); |
| |
| __ bind(&test); |
| if (stmt->cond() != NULL) { |
| VisitForControl(stmt->cond(), |
| &body, |
| loop_statement.break_label(), |
| loop_statement.break_label()); |
| } else { |
| __ jmp(&body); |
| } |
| |
| PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS); |
| __ bind(loop_statement.break_label()); |
| decrement_loop_depth(); |
| } |
| |
| |
| void FullCodeGenerator::VisitTryCatchStatement(TryCatchStatement* stmt) { |
| Comment cmnt(masm_, "[ TryCatchStatement"); |
| SetStatementPosition(stmt); |
| // 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); |
| handler_table()->set(stmt->index(), Smi::FromInt(handler_entry.pos())); |
| // Exception handler code, the exception is in the result register. |
| // Extend the context before executing the catch block. |
| { Comment cmnt(masm_, "[ Extend catch context"); |
| __ Push(stmt->variable()->name()); |
| __ push(result_register()); |
| PushFunctionArgumentForContextAllocation(); |
| __ CallRuntime(Runtime::kPushCatchContext, 3); |
| StoreToFrameField(StandardFrameConstants::kContextOffset, |
| context_register()); |
| } |
| |
| Scope* saved_scope = scope(); |
| scope_ = stmt->scope(); |
| ASSERT(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); |
| __ PushTryHandler(StackHandler::CATCH, stmt->index()); |
| { TryCatch try_body(this); |
| Visit(stmt->try_block()); |
| } |
| __ PopTryHandler(); |
| __ bind(&exit); |
| } |
| |
| |
| void FullCodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* stmt) { |
| Comment cmnt(masm_, "[ TryFinallyStatement"); |
| SetStatementPosition(stmt); |
| // 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 removes the try-handler and |
| // calls the finally block code before continuing. |
| // 2. By exiting the try-block with a function-local control flow transfer |
| // (break/continue/return). The site of the, e.g., break removes the |
| // try handler and calls the finally block code before continuing |
| // its outward control transfer. |
| // 3. By exiting the try-block with a thrown exception. |
| // This can happen in nested function calls. It traverses the try-handler |
| // chain and consumes the try-handler entry before jumping to the |
| // handler code. The handler code then calls the finally-block before |
| // rethrowing the exception. |
| // |
| // The finally block must assume a return address on top of the stack |
| // (or in the link register on ARM chips) and a value (return value or |
| // exception) in the result register (rax/eax/r0), both of which must |
| // be preserved. The return address isn't GC-safe, so it should be |
| // cooked before GC. |
| Label try_entry, handler_entry, finally_entry; |
| |
| // Jump to try-handler setup and try-block code. |
| __ jmp(&try_entry); |
| __ bind(&handler_entry); |
| handler_table()->set(stmt->index(), Smi::FromInt(handler_entry.pos())); |
| // Exception handler code. This code is only executed when an exception |
| // is thrown. The exception is in the result register, and must be |
| // preserved by the finally block. Call the finally block and then |
| // rethrow the exception if it returns. |
| __ Call(&finally_entry); |
| __ push(result_register()); |
| __ CallRuntime(Runtime::kReThrow, 1); |
| |
| // Finally block implementation. |
| __ bind(&finally_entry); |
| EnterFinallyBlock(); |
| { Finally finally_body(this); |
| Visit(stmt->finally_block()); |
| } |
| ExitFinallyBlock(); // Return to the calling code. |
| |
| // Set up try handler. |
| __ bind(&try_entry); |
| __ PushTryHandler(StackHandler::FINALLY, stmt->index()); |
| { TryFinally try_body(this, &finally_entry); |
| Visit(stmt->try_block()); |
| } |
| __ PopTryHandler(); |
| // 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(); |
| __ Call(&finally_entry); |
| } |
| |
| |
| void FullCodeGenerator::VisitDebuggerStatement(DebuggerStatement* stmt) { |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| Comment cmnt(masm_, "[ DebuggerStatement"); |
| SetStatementPosition(stmt); |
| |
| __ DebugBreak(); |
| // Ignore the return value. |
| #endif |
| } |
| |
| |
| void FullCodeGenerator::VisitConditional(Conditional* expr) { |
| Comment cmnt(masm_, "[ Conditional"); |
| Label true_case, false_case, done; |
| VisitForControl(expr->condition(), &true_case, &false_case, &true_case); |
| |
| PrepareForBailoutForId(expr->ThenId(), NO_REGISTERS); |
| __ bind(&true_case); |
| SetExpressionPosition(expr->then_expression(), |
| expr->then_expression_position()); |
| 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); |
| } |
| |
| PrepareForBailoutForId(expr->ElseId(), NO_REGISTERS); |
| __ bind(&false_case); |
| SetExpressionPosition(expr->else_expression(), |
| expr->else_expression_position()); |
| 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::BuildFunctionInfo(expr, script()); |
| if (function_info.is_null()) { |
| SetStackOverflow(); |
| return; |
| } |
| EmitNewClosure(function_info, expr->pretenure()); |
| } |
| |
| |
| void FullCodeGenerator::VisitSharedFunctionInfoLiteral( |
| SharedFunctionInfoLiteral* expr) { |
| Comment cmnt(masm_, "[ SharedFunctionInfoLiteral"); |
| EmitNewClosure(expr->shared_function_info(), false); |
| } |
| |
| |
| void FullCodeGenerator::VisitThrow(Throw* expr) { |
| Comment cmnt(masm_, "[ Throw"); |
| VisitForStackValue(expr->exception()); |
| __ CallRuntime(Runtime::kThrow, 1); |
| // Never returns here. |
| } |
| |
| |
| FullCodeGenerator::NestedStatement* FullCodeGenerator::TryCatch::Exit( |
| int* stack_depth, |
| int* context_length) { |
| // The macros used here must preserve the result register. |
| __ Drop(*stack_depth); |
| __ PopTryHandler(); |
| *stack_depth = 0; |
| return previous_; |
| } |
| |
| |
| bool FullCodeGenerator::TryLiteralCompare(CompareOperation* expr) { |
| Expression* sub_expr; |
| Handle<String> check; |
| if (expr->IsLiteralCompareTypeof(&sub_expr, &check)) { |
| EmitLiteralCompareTypeof(expr, sub_expr, check); |
| return true; |
| } |
| |
| if (expr->IsLiteralCompareUndefined(&sub_expr)) { |
| EmitLiteralCompareNil(expr, sub_expr, kUndefinedValue); |
| return true; |
| } |
| |
| if (expr->IsLiteralCompareNull(&sub_expr)) { |
| EmitLiteralCompareNil(expr, sub_expr, kNullValue); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| |
| #undef __ |
| |
| |
| } } // namespace v8::internal |