1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/frontend/LexicalScopeEmitter.cpp b/js/src/frontend/LexicalScopeEmitter.cpp
new file mode 100644
index 0000000000..231e5edc02
--- /dev/null
+++ b/js/src/frontend/LexicalScopeEmitter.cpp
@@ -0,0 +1,59 @@
+/* -*- 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/. */
+
+#include "frontend/LexicalScopeEmitter.h"
+
+#include "frontend/BytecodeEmitter.h"  // BytecodeEmitter
+
+using namespace js;
+using namespace js::frontend;
+
+LexicalScopeEmitter::LexicalScopeEmitter(BytecodeEmitter* bce) : bce_(bce) {}
+
+bool LexicalScopeEmitter::emitScope(ScopeKind kind,
+                                    LexicalScope::ParserData* bindings) {
+  MOZ_ASSERT(state_ == State::Start);
+  MOZ_ASSERT(bindings);
+
+  tdzCache_.emplace(bce_);
+  emitterScope_.emplace(bce_);
+  if (!emitterScope_->enterLexical(bce_, kind, bindings)) {
+    return false;
+  }
+
+#ifdef DEBUG
+  state_ = State::Scope;
+#endif
+  return true;
+}
+
+bool LexicalScopeEmitter::emitEmptyScope() {
+  MOZ_ASSERT(state_ == State::Start);
+
+  tdzCache_.emplace(bce_);
+
+#ifdef DEBUG
+  state_ = State::Scope;
+#endif
+  return true;
+}
+
+bool LexicalScopeEmitter::emitEnd() {
+  MOZ_ASSERT(state_ == State::Scope);
+
+  if (emitterScope_) {
+    if (!emitterScope_->leave(bce_)) {
+      return false;
+    }
+    emitterScope_.reset();
+  }
+  tdzCache_.reset();
+
+#ifdef DEBUG
+  state_ = State::End;
+#endif
+  return true;
+}