[destructuring] Implement parameter pattern matching.

src/snapshot/serialize.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 2621 matching lines @@
 
   // Copy serialized data.
   CopyBytes(data_ + padded_payload_offset, payload.begin(),
             static_cast<size_t>(payload.length()));
 }
 
 
 SerializedCodeData::SanityCheckResult SerializedCodeData::SanityCheck(
     Isolate* isolate, String* source) const {
   uint32_t magic_number = GetMagicNumber();
+  if (magic_number != ComputeMagicNumber(isolate)) return MAGIC_NUMBER_MISMATCH;
   uint32_t version_hash = GetHeaderValue(kVersionHashOffset);
   uint32_t source_hash = GetHeaderValue(kSourceHashOffset);
   uint32_t cpu_features = GetHeaderValue(kCpuFeaturesOffset);
   uint32_t flags_hash = GetHeaderValue(kFlagHashOffset);
   uint32_t c1 = GetHeaderValue(kChecksum1Offset);
   uint32_t c2 = GetHeaderValue(kChecksum2Offset);
-  if (magic_number != ComputeMagicNumber(isolate)) return MAGIC_NUMBER_MISMATCH;
   if (version_hash != Version::Hash()) return VERSION_MISMATCH;
   if (source_hash != SourceHash(source)) return SOURCE_MISMATCH;
   if (cpu_features != static_cast<uint32_t>(CpuFeatures::SupportedFeatures())) {
     return CPU_FEATURES_MISMATCH;
   }
   if (flags_hash != FlagList::Hash()) return FLAGS_MISMATCH;
   if (!Checksum(Payload()).Check(c1, c2)) return CHECKSUM_MISMATCH;
   return CHECK_SUCCESS;
 }
 
@@ skipping 53 matching lines @@
   SerializedCodeData* scd = new SerializedCodeData(cached_data);
   SanityCheckResult r = scd->SanityCheck(isolate, source);
   if (r == CHECK_SUCCESS) return scd;
   cached_data->Reject();
   source->GetIsolate()->counters()->code_cache_reject_reason()->AddSample(r);
   delete scd;
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8