summaryrefslogtreecommitdiffstats
path: root/js/src/frontend/LabelEmitter.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /js/src/frontend/LabelEmitter.h
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/frontend/LabelEmitter.h')
-rw-r--r--js/src/frontend/LabelEmitter.h65
1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/frontend/LabelEmitter.h b/js/src/frontend/LabelEmitter.h
new file mode 100644
index 0000000000..f3d9ec67c0
--- /dev/null
+++ b/js/src/frontend/LabelEmitter.h
@@ -0,0 +1,65 @@
+/* -*- 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 */