| // Copyright 2015 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/interpreter/bytecode-generator.h" |
| |
| #include <stack> |
| |
| #include "src/compiler.h" |
| #include "src/objects.h" |
| #include "src/scopes.h" |
| #include "src/token.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace interpreter { |
| |
| BytecodeGenerator::BytecodeGenerator(Isolate* isolate, Zone* zone) |
| : builder_(isolate, zone) { |
| InitializeAstVisitor(isolate, zone); |
| } |
| |
| |
| BytecodeGenerator::~BytecodeGenerator() {} |
| |
| |
| Handle<BytecodeArray> BytecodeGenerator::MakeBytecode(CompilationInfo* info) { |
| set_info(info); |
| set_scope(info->scope()); |
| |
| // This a temporary guard (oth). |
| DCHECK(scope()->is_function_scope()); |
| |
| builder().set_parameter_count(info->num_parameters_including_this()); |
| builder().set_locals_count(scope()->num_stack_slots()); |
| |
| // Visit implicit declaration of the function name. |
| if (scope()->is_function_scope() && scope()->function() != NULL) { |
| VisitVariableDeclaration(scope()->function()); |
| } |
| |
| // Visit declarations within the function scope. |
| VisitDeclarations(scope()->declarations()); |
| |
| // Visit statements in the function body. |
| VisitStatements(info->literal()->body()); |
| |
| set_scope(nullptr); |
| set_info(nullptr); |
| return builder_.ToBytecodeArray(); |
| } |
| |
| |
| void BytecodeGenerator::VisitBlock(Block* node) { |
| builder().EnterBlock(); |
| if (node->scope() == NULL) { |
| // Visit statements in the same scope, no declarations. |
| VisitStatements(node->statements()); |
| } else { |
| // Visit declarations and statements in a block scope. |
| if (node->scope()->ContextLocalCount() > 0) { |
| UNIMPLEMENTED(); |
| } else { |
| VisitDeclarations(node->scope()->declarations()); |
| VisitStatements(node->statements()); |
| } |
| } |
| builder().LeaveBlock(); |
| } |
| |
| |
| void BytecodeGenerator::VisitVariableDeclaration(VariableDeclaration* decl) { |
| Variable* variable = decl->proxy()->var(); |
| switch (variable->location()) { |
| case VariableLocation::GLOBAL: |
| case VariableLocation::UNALLOCATED: |
| UNIMPLEMENTED(); |
| break; |
| case VariableLocation::PARAMETER: |
| case VariableLocation::LOCAL: |
| // Details stored in scope, i.e. variable index. |
| break; |
| case VariableLocation::CONTEXT: |
| case VariableLocation::LOOKUP: |
| UNIMPLEMENTED(); |
| break; |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitImportDeclaration(ImportDeclaration* decl) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitExportDeclaration(ExportDeclaration* decl) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) { |
| Visit(stmt->expression()); |
| } |
| |
| |
| void BytecodeGenerator::VisitEmptyStatement(EmptyStatement* stmt) { |
| // TODO(oth): For control-flow it could be useful to signal empty paths here. |
| } |
| |
| |
| void BytecodeGenerator::VisitIfStatement(IfStatement* stmt) { |
| BytecodeLabel else_start, else_end; |
| // TODO(oth): Spot easy cases where there code would not need to |
| // emit the then block or the else block, e.g. condition is |
| // obviously true/1/false/0. |
| Visit(stmt->condition()); |
| builder().CastAccumulatorToBoolean(); |
| builder().JumpIfFalse(&else_start); |
| |
| Visit(stmt->then_statement()); |
| builder().Jump(&else_end); |
| builder().Bind(&else_start); |
| |
| Visit(stmt->else_statement()); |
| builder().Bind(&else_end); |
| } |
| |
| |
| void BytecodeGenerator::VisitSloppyBlockFunctionStatement( |
| SloppyBlockFunctionStatement* stmt) { |
| Visit(stmt->statement()); |
| } |
| |
| |
| void BytecodeGenerator::VisitContinueStatement(ContinueStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitBreakStatement(BreakStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitReturnStatement(ReturnStatement* stmt) { |
| Visit(stmt->expression()); |
| builder().Return(); |
| } |
| |
| |
| void BytecodeGenerator::VisitWithStatement(WithStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitCaseClause(CaseClause* clause) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitDoWhileStatement(DoWhileStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitWhileStatement(WhileStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitForStatement(ForStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitForInStatement(ForInStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitForOfStatement(ForOfStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitTryCatchStatement(TryCatchStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitDebuggerStatement(DebuggerStatement* stmt) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitFunctionLiteral(FunctionLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitClassLiteral(ClassLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitNativeFunctionLiteral( |
| NativeFunctionLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitConditional(Conditional* expr) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitLiteral(Literal* expr) { |
| Handle<Object> value = expr->value(); |
| if (value->IsSmi()) { |
| builder().LoadLiteral(Smi::cast(*value)); |
| } else if (value->IsUndefined()) { |
| builder().LoadUndefined(); |
| } else if (value->IsTrue()) { |
| builder().LoadTrue(); |
| } else if (value->IsFalse()) { |
| builder().LoadFalse(); |
| } else if (value->IsNull()) { |
| builder().LoadNull(); |
| } else if (value->IsTheHole()) { |
| builder().LoadTheHole(); |
| } else { |
| builder().LoadLiteral(value); |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitVariableProxy(VariableProxy* proxy) { |
| VisitVariableLoad(proxy->var()); |
| } |
| |
| |
| void BytecodeGenerator::VisitVariableLoad(Variable* variable) { |
| switch (variable->location()) { |
| case VariableLocation::LOCAL: { |
| Register source(variable->index()); |
| builder().LoadAccumulatorWithRegister(source); |
| break; |
| } |
| case VariableLocation::PARAMETER: { |
| // The parameter indices are shifted by 1 (receiver is variable |
| // index -1 but is parameter index 0 in BytecodeArrayBuilder). |
| Register source(builder().Parameter(variable->index() + 1)); |
| builder().LoadAccumulatorWithRegister(source); |
| break; |
| } |
| case VariableLocation::GLOBAL: { |
| // Global var, const, or let variable. |
| // TODO(rmcilroy): If context chain depth is short enough, do this using |
| // a generic version of LoadGlobalViaContextStub rather than calling the |
| // runtime. |
| DCHECK(variable->IsStaticGlobalObjectProperty()); |
| builder().LoadGlobal(variable->index()); |
| break; |
| } |
| case VariableLocation::UNALLOCATED: |
| case VariableLocation::CONTEXT: |
| case VariableLocation::LOOKUP: |
| UNIMPLEMENTED(); |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitAssignment(Assignment* expr) { |
| DCHECK(expr->target()->IsValidReferenceExpression()); |
| TemporaryRegisterScope temporary_register_scope(&builder_); |
| Register object, key; |
| |
| // Left-hand side can only be a property, a global or a variable slot. |
| Property* property = expr->target()->AsProperty(); |
| LhsKind assign_type = Property::GetAssignType(property); |
| |
| // Evaluate LHS expression. |
| switch (assign_type) { |
| case VARIABLE: |
| // Nothing to do to evaluate variable assignment LHS. |
| break; |
| case NAMED_PROPERTY: |
| object = temporary_register_scope.NewRegister(); |
| key = temporary_register_scope.NewRegister(); |
| Visit(property->obj()); |
| builder().StoreAccumulatorInRegister(object); |
| builder().LoadLiteral(property->key()->AsLiteral()->AsPropertyName()); |
| builder().StoreAccumulatorInRegister(key); |
| break; |
| case KEYED_PROPERTY: |
| object = temporary_register_scope.NewRegister(); |
| key = temporary_register_scope.NewRegister(); |
| Visit(property->obj()); |
| builder().StoreAccumulatorInRegister(object); |
| Visit(property->key()); |
| builder().StoreAccumulatorInRegister(key); |
| break; |
| case NAMED_SUPER_PROPERTY: |
| case KEYED_SUPER_PROPERTY: |
| UNIMPLEMENTED(); |
| } |
| |
| // Evaluate the value and potentially handle compound assignments by loading |
| // the left-hand side value and performing a binary operation. |
| if (expr->is_compound()) { |
| UNIMPLEMENTED(); |
| } else { |
| Visit(expr->value()); |
| } |
| |
| // Store the value. |
| FeedbackVectorICSlot slot = expr->AssignmentSlot(); |
| switch (assign_type) { |
| case VARIABLE: { |
| Variable* variable = expr->target()->AsVariableProxy()->var(); |
| DCHECK(variable->location() == VariableLocation::LOCAL); |
| Register destination(variable->index()); |
| builder().StoreAccumulatorInRegister(destination); |
| break; |
| } |
| case NAMED_PROPERTY: |
| builder().StoreNamedProperty(object, key, feedback_index(slot), |
| language_mode()); |
| break; |
| case KEYED_PROPERTY: |
| builder().StoreKeyedProperty(object, key, feedback_index(slot), |
| language_mode()); |
| break; |
| case NAMED_SUPER_PROPERTY: |
| case KEYED_SUPER_PROPERTY: |
| UNIMPLEMENTED(); |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitYield(Yield* expr) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitThrow(Throw* expr) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitPropertyLoad(Register obj, Property* expr) { |
| LhsKind property_kind = Property::GetAssignType(expr); |
| FeedbackVectorICSlot slot = expr->PropertyFeedbackSlot(); |
| switch (property_kind) { |
| case VARIABLE: |
| UNREACHABLE(); |
| case NAMED_PROPERTY: { |
| builder().LoadLiteral(expr->key()->AsLiteral()->AsPropertyName()); |
| builder().LoadNamedProperty(obj, feedback_index(slot), language_mode()); |
| break; |
| } |
| case KEYED_PROPERTY: { |
| Visit(expr->key()); |
| builder().LoadKeyedProperty(obj, feedback_index(slot), language_mode()); |
| break; |
| } |
| case NAMED_SUPER_PROPERTY: |
| case KEYED_SUPER_PROPERTY: |
| UNIMPLEMENTED(); |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitProperty(Property* expr) { |
| TemporaryRegisterScope temporary_register_scope(&builder_); |
| Register obj = temporary_register_scope.NewRegister(); |
| Visit(expr->obj()); |
| builder().StoreAccumulatorInRegister(obj); |
| VisitPropertyLoad(obj, expr); |
| } |
| |
| |
| void BytecodeGenerator::VisitCall(Call* expr) { |
| Expression* callee_expr = expr->expression(); |
| Call::CallType call_type = expr->GetCallType(isolate()); |
| |
| // Prepare the callee and the receiver to the function call. This depends on |
| // the semantics of the underlying call type. |
| TemporaryRegisterScope temporary_register_scope(&builder_); |
| Register callee = temporary_register_scope.NewRegister(); |
| Register receiver = temporary_register_scope.NewRegister(); |
| |
| switch (call_type) { |
| case Call::PROPERTY_CALL: { |
| Property* property = callee_expr->AsProperty(); |
| if (property->IsSuperAccess()) { |
| UNIMPLEMENTED(); |
| } |
| Visit(property->obj()); |
| builder().StoreAccumulatorInRegister(receiver); |
| // Perform a property load of the callee. |
| VisitPropertyLoad(receiver, property); |
| builder().StoreAccumulatorInRegister(callee); |
| break; |
| } |
| case Call::GLOBAL_CALL: { |
| // Receiver is undefined for global calls. |
| builder().LoadUndefined().StoreAccumulatorInRegister(receiver); |
| // Load callee as a global variable. |
| VariableProxy* proxy = callee_expr->AsVariableProxy(); |
| VisitVariableLoad(proxy->var()); |
| builder().StoreAccumulatorInRegister(callee); |
| break; |
| } |
| case Call::LOOKUP_SLOT_CALL: |
| case Call::SUPER_CALL: |
| case Call::POSSIBLY_EVAL_CALL: |
| case Call::OTHER_CALL: |
| UNIMPLEMENTED(); |
| } |
| |
| // Evaluate all arguments to the function call and store in sequential |
| // registers. |
| ZoneList<Expression*>* args = expr->arguments(); |
| for (int i = 0; i < args->length(); ++i) { |
| Visit(args->at(i)); |
| Register arg = temporary_register_scope.NewRegister(); |
| DCHECK(arg.index() - i == receiver.index() + 1); |
| builder().StoreAccumulatorInRegister(arg); |
| } |
| |
| // TODO(rmcilroy): Deal with possible direct eval here? |
| // TODO(rmcilroy): Use CallIC to allow call type feedback. |
| builder().Call(callee, receiver, args->length()); |
| } |
| |
| |
| void BytecodeGenerator::VisitCallNew(CallNew* expr) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitCallRuntime(CallRuntime* expr) { UNIMPLEMENTED(); } |
| |
| |
| void BytecodeGenerator::VisitUnaryOperation(UnaryOperation* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitCountOperation(CountOperation* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitBinaryOperation(BinaryOperation* binop) { |
| switch (binop->op()) { |
| case Token::COMMA: |
| case Token::OR: |
| case Token::AND: |
| UNIMPLEMENTED(); |
| break; |
| default: |
| VisitArithmeticExpression(binop); |
| break; |
| } |
| } |
| |
| |
| void BytecodeGenerator::VisitCompareOperation(CompareOperation* expr) { |
| Token::Value op = expr->op(); |
| Expression* left = expr->left(); |
| Expression* right = expr->right(); |
| |
| TemporaryRegisterScope temporary_register_scope(&builder_); |
| Register temporary = temporary_register_scope.NewRegister(); |
| |
| Visit(left); |
| builder().StoreAccumulatorInRegister(temporary); |
| Visit(right); |
| builder().CompareOperation(op, temporary, language_mode()); |
| } |
| |
| |
| void BytecodeGenerator::VisitSpread(Spread* expr) { UNREACHABLE(); } |
| |
| |
| void BytecodeGenerator::VisitEmptyParentheses(EmptyParentheses* expr) { |
| UNREACHABLE(); |
| } |
| |
| |
| void BytecodeGenerator::VisitThisFunction(ThisFunction* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitSuperCallReference(SuperCallReference* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitSuperPropertyReference( |
| SuperPropertyReference* expr) { |
| UNIMPLEMENTED(); |
| } |
| |
| |
| void BytecodeGenerator::VisitArithmeticExpression(BinaryOperation* binop) { |
| Token::Value op = binop->op(); |
| Expression* left = binop->left(); |
| Expression* right = binop->right(); |
| |
| TemporaryRegisterScope temporary_register_scope(&builder_); |
| Register temporary = temporary_register_scope.NewRegister(); |
| |
| Visit(left); |
| builder().StoreAccumulatorInRegister(temporary); |
| Visit(right); |
| builder().BinaryOperation(op, temporary); |
| } |
| |
| |
| LanguageMode BytecodeGenerator::language_mode() const { |
| return info()->language_mode(); |
| } |
| |
| |
| int BytecodeGenerator::feedback_index(FeedbackVectorICSlot slot) const { |
| return info()->feedback_vector()->GetIndex(slot); |
| } |
| |
| } // namespace interpreter |
| } // namespace internal |
| } // namespace v8 |