[wasm] external serialization APIs

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 984 matching lines @@
   V(JSError)                     \
   V(JSPromise)                   \
   V(JSSet)                       \
   V(JSMap)                       \
   V(JSSetIterator)               \
   V(JSMapIterator)               \
   V(JSWeakCollection)            \
   V(JSWeakMap)                   \
   V(JSWeakSet)                   \
   V(JSRegExp)                    \
+  V(WebAssemblyCompiledModule)   \
   V(HashTable)                   \
   V(Dictionary)                  \
   V(UnseededNumberDictionary)    \
   V(StringTable)                 \
   V(StringSet)                   \
   V(NormalizedMapCache)          \
   V(CompilationCacheTable)       \
   V(CodeCacheHashTable)          \
   V(MapCache)                    \
   V(JSGlobalObject)              \
@@ skipping 7127 matching lines @@
   static const int kStackFramesOffset = kScriptOffset + kPointerSize;
   static const int kStartPositionOffset = kStackFramesOffset + kPointerSize;
   static const int kEndPositionOffset = kStartPositionOffset + kPointerSize;
   static const int kSize = kEndPositionOffset + kPointerSize;
 
   typedef FixedBodyDescriptor<HeapObject::kMapOffset,
                               kStackFramesOffset + kPointerSize,
                               kSize> BodyDescriptor;
 };
 
+// A compiled web assembly module.
+class WebAssemblyCompiledModule : public JSObject {
+ public:
+  // Serialize the compiled module. The returned buffer is owned by
+  // the caller, who may simply leave the return value drop out of
+  // scope, once done processing the bytes.
+  // TODO(mtrofin): to avoid increased memory pressure, we should
+  // explore a caller-provided segmented memory design.
+  std::pair<std::unique_ptr<const byte>, size_t> Serialize();
+
+  // Deserialize a compiled module. The buffer is owned by the caller and may
+  // be released after deserialization returns.
+  static MaybeHandle<WebAssemblyCompiledModule> Deserialize(Isolate* isolate,
+                                                            const byte* data,
+                                                            size_t size);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebAssemblyCompiledModule);
+};
 
 // Regular expressions
 // The regular expression holds a single reference to a FixedArray in
 // the kDataOffset field.
 // The FixedArray contains the following data:
 // - tag : type of regexp implementation (not compiled yet, atom or irregexp)
 // - reference to the original source string
 // - reference to the original flag string
 // If it is an atom regexp
 // - a reference to a literal string to search for
@@ skipping 2905 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_