[wasm] Implement an interpreter for WASM.

src/wasm/wasm-macro-gen.h

 // Copyright 2015 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_MACRO_GEN_H_
 #define V8_WASM_MACRO_GEN_H_
 
 #include "src/wasm/wasm-opcodes.h"
 
 #include "src/zone-containers.h"
@@ skipping 122 matching lines @@
 // A helper for encoding local declarations prepended to the body of a
 // function.
 // TODO(titzer): move this to an appropriate header.
 class 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(const byte** start, const byte** end) const {
+  void Prepend(Zone* zone, const byte** start, const byte** end) const {
     size_t size = (*end - *start);
-    byte* buffer = new byte[Size() + size];
+    byte* buffer = reinterpret_cast<byte*>(zone->New(Size() + size));
     size_t pos = Emit(buffer);
     memcpy(buffer + pos, *start, size);
     pos += size;
     *start = buffer;
     *end = buffer + pos;
   }
 
   size_t Emit(byte* buffer) const {
     size_t pos = 0;
     pos = WriteUint32v(buffer, pos, static_cast<uint32_t>(local_decls.size()));
@@ skipping 436 matching lines @@
 #define SIG_ENTRY_x(r) kWasmFunctionTypeForm, 0, 1, r
 #define SIG_ENTRY_x_x(r, a) kWasmFunctionTypeForm, 1, a, 1, r
 #define SIG_ENTRY_x_xx(r, a, b) kWasmFunctionTypeForm, 2, a, b, 1, r
 #define SIG_ENTRY_x_xxx(r, a, b, c) kWasmFunctionTypeForm, 3, a, b, c, 1, r
 #define SIZEOF_SIG_ENTRY_x 4
 #define SIZEOF_SIG_ENTRY_x_x 5
 #define SIZEOF_SIG_ENTRY_x_xx 6
 #define SIZEOF_SIG_ENTRY_x_xxx 7
 
 #endif  // V8_WASM_MACRO_GEN_H_