1 files changed, 50 insertions, 0 deletions
diff --git a/deps/v8/src/wasm/local-decl-encoder.h b/deps/v8/src/wasm/local-decl-encoder.h
new file mode 100644
index 0000000000..e0725efe9b
--- /dev/null
+++ b/deps/v8/src/wasm/local-decl-encoder.h
@@ -0,0 +1,50 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_WASM_LOCAL_DECL_ENCODER_H_
+#define V8_WASM_LOCAL_DECL_ENCODER_H_
+
+#include "src/globals.h"
+#include "src/wasm/wasm-opcodes.h"
+#include "src/zone/zone-containers.h"
+#include "src/zone/zone.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+// A helper for encoding local declarations prepended to the body of a
+// function.
+class V8_EXPORT_PRIVATE LocalDeclEncoder {
+ public:
+  explicit LocalDeclEncoder(Zone* zone, FunctionSig* s = nullptr)
+      : sig(s), local_decls(zone), total(0) {}
+
+  // Prepend local declarations by creating a new buffer and copying data
+  // over. The new buffer must be delete[]'d by the caller.
+  void Prepend(Zone* zone, const byte** start, const byte** end) const;
+
+  size_t Emit(byte* buffer) const;
+
+  // Add locals declarations to this helper. Return the index of the newly added
+  // local(s), with an optional adjustment for the parameters.
+  uint32_t AddLocals(uint32_t count, ValueType type);
+
+  size_t Size() const;
+
+  bool has_sig() const { return sig != nullptr; }
+  FunctionSig* get_sig() const { return sig; }
+  void set_sig(FunctionSig* s) { sig = s; }
+
+ private:
+  FunctionSig* sig;
+  ZoneVector<std::pair<uint32_t, ValueType>> local_decls;
+  size_t total;
+};
+
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_WASM_LOCAL_DECL_ENCODER_H_