[wasm] Serialization/Deserialization of compiled module

src/snapshot/code-serializer.h

 // Copyright 2016 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_SNAPSHOT_CODE_SERIALIZER_H_
 #define V8_SNAPSHOT_CODE_SERIALIZER_H_
 
 #include "src/parsing/preparse-data.h"
 #include "src/snapshot/serializer.h"
 
 namespace v8 {
 namespace internal {
 
 class CodeSerializer : public Serializer {
  public:
+  explicit CodeSerializer(Isolate* isolate, uint32_t source_hash)
+      : Serializer(isolate), source_hash_(source_hash) {}
+  ~CodeSerializer() override { OutputStatistics("CodeSerializer"); }
+
   static ScriptData* Serialize(Isolate* isolate,
                                Handle<SharedFunctionInfo> info,
                                Handle<String> source);
 
+  ScriptData* Serialize(Handle<HeapObject> obj);
+
   MUST_USE_RESULT static MaybeHandle<SharedFunctionInfo> Deserialize(
       Isolate* isolate, ScriptData* cached_data, Handle<String> source);
 
-  String* source() const {
-    DCHECK(!AllowHeapAllocation::IsAllowed());
-    return source_;
-  }
-
   const List<uint32_t>* stub_keys() const { return &stub_keys_; }
 
+  uint32_t source_hash() const { return source_hash_; }
+
  private:
-  CodeSerializer(Isolate* isolate, String* source)
-      : Serializer(isolate), source_(source) {
-    reference_map_.AddAttachedReference(source);
-  }
-
-  ~CodeSerializer() override { OutputStatistics("CodeSerializer"); }
-
   void SerializeObject(HeapObject* o, HowToCode how_to_code,
                        WhereToPoint where_to_point, int skip) override;
 
   void SerializeBuiltin(int builtin_index, HowToCode how_to_code,
                         WhereToPoint where_to_point);
   void SerializeCodeStub(Code* code_stub, HowToCode how_to_code,
                          WhereToPoint where_to_point);
   void SerializeGeneric(HeapObject* heap_object, HowToCode how_to_code,
                         WhereToPoint where_to_point);
 
   DisallowHeapAllocation no_gc_;
-  String* source_;
+  uint32_t source_hash_;
   List<uint32_t> stub_keys_;
   DISALLOW_COPY_AND_ASSIGN(CodeSerializer);
 };
 
+enum SanityCheckResult {

[Yang, 2016/08/05 12:04:17]

Can we keep this in SerializedCodeData? We can make it public.

[Mircea Trofin, 2016/08/05 15:01:29]

Acknowledged.

[Mircea Trofin, 2016/08/06 00:31:39]

Done.

+  CHECK_SUCCESS = 0,
+  MAGIC_NUMBER_MISMATCH = 1,
+  VERSION_MISMATCH = 2,
+  SOURCE_MISMATCH = 3,
+  CPU_FEATURES_MISMATCH = 4,
+  FLAGS_MISMATCH = 5,
+  CHECKSUM_MISMATCH = 6
+};
+
 // Wrapper around ScriptData to provide code-serializer-specific functionality.
 class SerializedCodeData : public SerializedData {
  public:
   // Used when consuming.
-  static SerializedCodeData* FromCachedData(Isolate* isolate,
-                                            ScriptData* cached_data,
-                                            String* source);
+  static const SerializedCodeData FromCachedData(
+      Isolate* isolate, ScriptData* cached_data, uint32_t expected_source_hash,
+      SanityCheckResult* rejection_result);
 
   // Used when producing.
   SerializedCodeData(const List<byte>* payload, const CodeSerializer* cs);
 
   // Return ScriptData object and relinquish ownership over it to the caller.
   ScriptData* GetScriptData();
 
   Vector<const Reservation> Reservations() const;
   Vector<const byte> Payload() const;
 
   Vector<const uint32_t> CodeStubKeys() const;
 
+  static uint32_t SourceHash(Handle<String> source);
+
  private:
   explicit SerializedCodeData(ScriptData* data);
+  SerializedCodeData(const byte* data, int size)
+      : SerializedData(const_cast<byte*>(data), size) {}
 
-  enum SanityCheckResult {
-    CHECK_SUCCESS = 0,
-    MAGIC_NUMBER_MISMATCH = 1,
-    VERSION_MISMATCH = 2,
-    SOURCE_MISMATCH = 3,
-    CPU_FEATURES_MISMATCH = 4,
-    FLAGS_MISMATCH = 5,
-    CHECKSUM_MISMATCH = 6
-  };
-
-  SanityCheckResult SanityCheck(Isolate* isolate, String* source) const;
-
-  uint32_t SourceHash(String* source) const;
-
+  SanityCheckResult SanityCheck(Isolate* isolate,
+                                uint32_t expected_source_hash) const;
   // The data header consists of uint32_t-sized entries:
   // [0] magic number and external reference count
   // [1] version hash
   // [2] source hash
   // [3] cpu features
   // [4] flag hash
   // [5] number of code stub keys
   // [6] number of reservation size entries
   // [7] payload length
   // [8] payload checksum part 1
@@ skipping 10 matching lines @@
   static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
   static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
   static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
   static const int kHeaderSize = kChecksum2Offset + kInt32Size;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_CODE_SERIALIZER_H_