1 files changed, 85 insertions, 0 deletions
diff --git a/js/src/vm/BytecodeIterator.h b/js/src/vm/BytecodeIterator.h
new file mode 100644
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+++ b/js/src/vm/BytecodeIterator.h
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+/* -*- 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 vm_BytecodeIterator_h
+#define vm_BytecodeIterator_h
+
+#include "vm/BytecodeLocation.h"
+
+namespace js {
+
+class BytecodeIterator {
+  BytecodeLocation current_;
+
+ public:
+  inline explicit BytecodeIterator(const JSScript* script);
+
+  explicit BytecodeIterator(BytecodeLocation loc) : current_(loc) {}
+
+  BytecodeIterator& operator=(const BytecodeIterator&) = default;
+
+  bool operator==(const BytecodeIterator& other) const {
+    return other.current_ == current_;
+  }
+
+  bool operator!=(const BytecodeIterator& other) const {
+    return !(other.current_ == current_);
+  }
+
+  const BytecodeLocation& operator*() const { return current_; }
+
+  const BytecodeLocation* operator->() const { return &current_; }
+
+  // Pre-increment
+  BytecodeIterator& operator++() {
+    current_ = current_.next();
+    return *this;
+  }
+
+  // Post-increment
+  BytecodeIterator operator++(int) {
+    BytecodeIterator previous(*this);
+    current_ = current_.next();
+    return previous;
+  }
+};
+
+// Given a JSScript, allow the construction of a range based for-loop
+// that will visit all script locations in that script.
+class AllBytecodesIterable {
+  const JSScript* script_;
+
+ public:
+  explicit AllBytecodesIterable(const JSScript* script) : script_(script) {}
+
+  BytecodeIterator begin();
+  BytecodeIterator end();
+};
+
+// Construct a range based iterator that will visit all bytecode locations
+// between two given bytecode locations.
+// `beginLoc_` is the bytecode location where the iterator will start, and
+// `endLoc_` is the bytecode location where the iterator will end.
+class BytecodeLocationRange {
+  BytecodeLocation beginLoc_;
+  BytecodeLocation endLoc_;
+
+ public:
+  explicit BytecodeLocationRange(BytecodeLocation beginLoc,
+                                 BytecodeLocation endLoc)
+      : beginLoc_(beginLoc), endLoc_(endLoc) {
+#ifdef DEBUG
+    MOZ_ASSERT(beginLoc.hasSameScript(endLoc));
+#endif
+  }
+
+  BytecodeIterator begin();
+  BytecodeIterator end();
+};
+
+}  // namespace js
+
+#endif