Revert of Remove serializer-specific hash table size heuristic. (patchset #1 id:1...

Reason for revert:
https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20gc%20stress/builds/3088/steps/Mjsunit/logs/load-proxy

Original issue's description:
> Remove serializer-specific hash table size heuristic.
>
> The heuristic can cause weird behavior when bootstrapping.
> The memory savings is not worth this hassle.
>
> Committed: https://crrev.com/a246e296c6366dcd0a2d8aa0df973d57093178f6
> Cr-Commit-Position: refs/heads/master@{#29992}

TBR=ulan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1257873006

Cr-Commit-Position: refs/heads/master@{#30000}

diff --git a/src/api.cc b/src/api.cc
index 524b71dbf2ab6626b58705112301afa11073555c..586fd8613a5a4b9dcaa5b47bfa4d56e65d804c7b 100644 (file)
--- a/src/api.cc
+++ b/src/api.cc
@@ -367,12 +367,14 @@ StartupData V8::CreateSnapshotDataBlob(const char* custom_source) {
     base::ElapsedTimer timer;
     timer.Start();
     Isolate::Scope isolate_scope(isolate);
+    internal_isolate->set_creating_default_snapshot(true);
     internal_isolate->Init(NULL);
     Persistent<Context> context;
     i::Snapshot::Metadata metadata;
     {
       HandleScope handle_scope(isolate);
       Local<Context> new_context = Context::New(isolate);
+      internal_isolate->set_creating_default_snapshot(false);
       context.Reset(isolate, new_context);
       if (custom_source != NULL) {
         metadata.set_embeds_script(true);

diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 29c815d1943cbaca184690233670adb809fd1f24..03f888b13ca8e01393bbe89ebaf7d1d7d166ae7e 100644 (file)
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2406,8 +2406,7 @@ bool Genesis::InstallNatives(ContextType context_type) {
   InstallNativeFunctions();
 
   auto function_cache =
-      ObjectHashTable::New(isolate(), ApiNatives::kInitialFunctionCacheSize,
-                           USE_CUSTOM_MINIMUM_CAPACITY);
+      ObjectHashTable::New(isolate(), ApiNatives::kInitialFunctionCacheSize);
   native_context()->set_function_cache(*function_cache);
 
   // Store the map for the string prototype after the natives has been compiled

diff --git a/src/isolate.h b/src/isolate.h
index 1451cf58c8ec07c8382d158ccd62cfe0ea81c8b9..7eac6edd25165f8937cf6ccfb59e2a8d89c11c4e 100644 (file)
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -384,6 +384,7 @@ typedef List<HeapObject*> DebugObjectCache;
   V(uint32_t, per_isolate_assert_data, 0xFFFFFFFFu)                            \
   V(PromiseRejectCallback, promise_reject_callback, NULL)                      \
   V(const v8::StartupData*, snapshot_blob, NULL)                               \
+  V(bool, creating_default_snapshot, false)                                    \
   ISOLATE_INIT_SIMULATOR_LIST(V)
 
 #define THREAD_LOCAL_TOP_ACCESSOR(type, name)                        \

diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3a9fe2991decc352c34f79a0635ce1968a57539f..ffe4d65afd180385b0805d72770b15c2b471c8b7 100644 (file)
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2996,6 +2996,13 @@ int HashTableBase::ComputeCapacity(int at_least_space_for) {
 }
 
 
+int HashTableBase::ComputeCapacityForSerialization(int at_least_space_for) {
+  const int kMinCapacity = 1;
+  int capacity = base::bits::RoundUpToPowerOfTwo32(at_least_space_for);
+  return Max(capacity, kMinCapacity);
+}
+
+
 template <typename Derived, typename Shape, typename Key>
 int HashTable<Derived, Shape, Key>::FindEntry(Key key) {
   return FindEntry(GetIsolate(), key);

diff --git a/src/objects.cc b/src/objects.cc
index 3fbb68bcab434d3a05e2a358d493eae70181c635..51675d4c21597465a1e4fa790127b4e33d411d6f 100644 (file)
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -13452,7 +13452,9 @@ Handle<Derived> HashTable<Derived, Shape, Key>::New(
 
   int capacity = (capacity_option == USE_CUSTOM_MINIMUM_CAPACITY)
                      ? at_least_space_for
-                     : ComputeCapacity(at_least_space_for);
+                     : isolate->creating_default_snapshot()
+                           ? ComputeCapacityForSerialization(at_least_space_for)
+                           : ComputeCapacity(at_least_space_for);
   if (capacity > HashTable::kMaxCapacity) {
     v8::internal::Heap::FatalProcessOutOfMemory("invalid table size", true);
   }

diff --git a/src/objects.h b/src/objects.h
index 72b1f06c8d84d0acec917f0366d867cdd3759e71..78de2235b7c991b5b36c395bcb3a9d12116a18a8 100644 (file)
--- a/src/objects.h
+++ b/src/objects.h
@@ -2955,6 +2955,9 @@ class HashTableBase : public FixedArray {
   // number of elements. May be more than HashTable::kMaxCapacity.
   static inline int ComputeCapacity(int at_least_space_for);
 
+  // Use a different heuristic to compute capacity when serializing.
+  static inline int ComputeCapacityForSerialization(int at_least_space_for);
+
   // Tells whether k is a real key.  The hole and undefined are not allowed
   // as keys and can be used to indicate missing or deleted elements.
   bool IsKey(Object* k) {