js/src/frontend/LexicalScopeEmitter.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/LexicalScopeEmitter.h"
   8
   9 using namespace js;
  10 using namespace js::frontend;
  11
  12 LexicalScopeEmitter::LexicalScopeEmitter(BytecodeEmitter* bce) : bce_(bce) {}
  13
  14 bool LexicalScopeEmitter::emitScope(ScopeKind kind,
  15                                     LexicalScope::ParserData* bindings) {
  16   MOZ_ASSERT(state_ == State::Start);
  17   MOZ_ASSERT(bindings);
  18
  19   tdzCache_.emplace(bce_);
  20   emitterScope_.emplace(bce_);
  21   if (!emitterScope_->enterLexical(bce_, kind, bindings)) {
  22     return false;
  23   }
  24
  25 #ifdef DEBUG
  26   state_ = State::Scope;
  27 #endif
  28   return true;
  29 }
  30
  31 bool LexicalScopeEmitter::emitEmptyScope() {
  32   MOZ_ASSERT(state_ == State::Start);
  33
  34   tdzCache_.emplace(bce_);
  35
  36 #ifdef DEBUG
  37   state_ = State::Scope;
  38 #endif
  39   return true;
  40 }
  41
  42 bool LexicalScopeEmitter::emitEnd() {
  43   MOZ_ASSERT(state_ == State::Scope);
  44
  45   if (emitterScope_) {
  46     if (!emitterScope_->leave(bce_)) {
  47       return false;
  48     }
  49     emitterScope_.reset();
  50   }
  51   tdzCache_.reset();
  52
  53 #ifdef DEBUG
  54   state_ = State::End;
  55 #endif
  56   return true;
  57 }