/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=8 sts=2 et sw=2 tw=80: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef frontend_LabelEmitter_h #define frontend_LabelEmitter_h #include "mozilla/Attributes.h" // MOZ_STACK_CLASS #include "mozilla/Maybe.h" // Maybe #include "frontend/BytecodeControlStructures.h" // LabelControl namespace js { namespace frontend { struct BytecodeEmitter; class TaggedParserAtomIndex; // Class for emitting labeled statement. // // Usage: (check for the return value is omitted for simplicity) // // `label: expr;` // LabelEmitter le(this); // le.emitLabel(name_of_label); // emit(expr); // le.emitEnd(); // class MOZ_STACK_CLASS LabelEmitter { BytecodeEmitter* bce_; mozilla::Maybe<LabelControl> controlInfo_; #ifdef DEBUG // The state of this emitter. // // +-------+ emitLabel +-------+ emitEnd +-----+ // | Start |---------->| Label |-------->| End | // +-------+ +-------+ +-----+ enum class State { // The initial state. Start, // After calling emitLabel. Label, // After calling emitEnd. End }; State state_ = State::Start; #endif public: explicit LabelEmitter(BytecodeEmitter* bce) : bce_(bce) {} void emitLabel(TaggedParserAtomIndex name); [[nodiscard]] bool emitEnd(); }; } /* namespace frontend */ } /* namespace js */ #endif /* frontend_LabelEmitter_h */