[stubs] A new approach to TF stubs

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/snapshot/serialize.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 522 matching lines @@
     DisallowHeapAllocation no_gc;
     isolate_->heap()->IterateSmiRoots(this);
     isolate_->heap()->IterateStrongRoots(this, VISIT_ONLY_STRONG);
     isolate_->heap()->RepairFreeListsAfterDeserialization();
     isolate_->heap()->IterateWeakRoots(this, VISIT_ALL);
     DeserializeDeferredObjects();
     FlushICacheForNewIsolate();
   }
 
   isolate_->heap()->set_native_contexts_list(
-      isolate_->heap()->code_stub_context());
-
+      isolate_->heap()->undefined_value());
   // The allocation site list is build during root iteration, but if no sites
   // were encountered then it needs to be initialized to undefined.
   if (isolate_->heap()->allocation_sites_list() == Smi::FromInt(0)) {
     isolate_->heap()->set_allocation_sites_list(
         isolate_->heap()->undefined_value());
   }
 
   // Update data pointers to the external strings containing natives sources.
   Natives::UpdateSourceCache(isolate_->heap());
   ExtraNatives::UpdateSourceCache(isolate_->heap());
-  CodeStubNatives::UpdateSourceCache(isolate_->heap());
 
   // Issue code events for newly deserialized code objects.
   LOG_CODE_EVENT(isolate_, LogCodeObjects());
   LOG_CODE_EVENT(isolate_, LogCompiledFunctions());
 }
 
 
 MaybeHandle<Object> Deserializer::DeserializePartial(
     Isolate* isolate, Handle<JSGlobalProxy> global_proxy,
     Handle<FixedArray>* outdated_contexts_out) {
@@ skipping 601 matching lines @@
       case kNativesStringResource:
         current = CopyInNativesSource(Natives::GetScriptSource(source_.Get()),
                                       current);
         break;
 
       case kExtraNativesStringResource:
         current = CopyInNativesSource(
             ExtraNatives::GetScriptSource(source_.Get()), current);
         break;
 
-      case kCodeStubNativesStringResource:
-        current = CopyInNativesSource(
-            CodeStubNatives::GetScriptSource(source_.Get()), current);
-        break;
-
       // Deserialize raw data of variable length.
       case kVariableRawData: {
         int size_in_bytes = source_.GetInt();
         byte* raw_data_out = reinterpret_cast<byte*>(current);
         source_.CopyRaw(raw_data_out, size_in_bytes);
         break;
       }
 
       case kVariableRepeat: {
         int repeats = source_.GetInt();
@@ skipping 515 matching lines @@
   // strong roots have been serialized we can create a partial snapshot
   // which will repopulate the cache with objects needed by that partial
   // snapshot.
   isolate->partial_snapshot_cache()->Clear();
   InitializeCodeAddressMap();
 }
 
 
 void StartupSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
                                         WhereToPoint where_to_point, int skip) {
-  // Make sure that all functions are derived from the code-stub context
-  DCHECK(!obj->IsJSFunction() ||
-         JSFunction::cast(obj)->GetCreationContext() ==
-             isolate()->heap()->code_stub_context());
+  DCHECK(!obj->IsJSFunction());
 
   int root_index = root_index_map_.Lookup(obj);
   // We can only encode roots as such if it has already been serialized.
   // That applies to root indices below the wave front.
   if (root_index != RootIndexMap::kInvalidRootIndex &&
       root_index < root_index_wave_front_) {
     PutRoot(root_index, obj, how_to_code, where_to_point, skip);
     return;
   }
 
@@ skipping 513 matching lines @@
           Natives::GetSourceCache(serializer_->isolate()->heap()),
           kNativesStringResource)) {
     return;
   }
   if (SerializeExternalNativeSourceString(
           ExtraNatives::GetBuiltinsCount(), resource_pointer,
           ExtraNatives::GetSourceCache(serializer_->isolate()->heap()),
           kExtraNativesStringResource)) {
     return;
   }
-  if (SerializeExternalNativeSourceString(
-          CodeStubNatives::GetBuiltinsCount(), resource_pointer,
-          CodeStubNatives::GetSourceCache(serializer_->isolate()->heap()),
-          kCodeStubNativesStringResource)) {
-    return;
-  }
   // One of the strings in the natives cache should match the resource.  We
   // don't expect any other kinds of external strings here.
   UNREACHABLE();
 }
 
 
 Address Serializer::ObjectSerializer::PrepareCode() {
   // To make snapshots reproducible, we make a copy of the code object
   // and wipe all pointers in the copy, which we then serialize.
   Code* original = Code::cast(object_);
@@ skipping 588 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