js/src/frontend/LabelEmitter.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "frontend/LabelEmitter.h"
   8
   9 #include "mozilla/Assertions.h"  // MOZ_ASSERT
  10
  11 #include "frontend/BytecodeEmitter.h"  // BytecodeEmitter
  12
  13 using namespace js;
  14 using namespace js::frontend;
  15
  16 void LabelEmitter::emitLabel(TaggedParserAtomIndex name) {
  17   MOZ_ASSERT(state_ == State::Start);
  18
  19   controlInfo_.emplace(bce_, name, bce_->bytecodeSection().offset());
  20
  21 #ifdef DEBUG
  22   state_ = State::Label;
  23 #endif
  24 }
  25
  26 bool LabelEmitter::emitEnd() {
  27   MOZ_ASSERT(state_ == State::Label);
  28
  29   // Patch the break/continue to this label.
  30   if (!controlInfo_->patchBreaks(bce_)) {
  31     return false;
  32   }
  33
  34   controlInfo_.reset();
  35
  36 #ifdef DEBUG
  37   state_ = State::End;
  38 #endif
  39   return true;
  40 }