Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/snapshot/snapshot-common.cc b/src/snapshot/snapshot-common.cc
new file mode 100644
index 0000000..97e7c6b
--- /dev/null
+++ b/src/snapshot/snapshot-common.cc
@@ -0,0 +1,232 @@
+// Copyright 2006-2008 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.
+
+// The common functionality when building with or without snapshots.
+
+#include "src/snapshot/snapshot.h"
+
+#include "src/api.h"
+#include "src/base/platform/platform.h"
+#include "src/full-codegen/full-codegen.h"
+
+namespace v8 {
+namespace internal {
+
+#ifdef DEBUG
+bool Snapshot::SnapshotIsValid(v8::StartupData* snapshot_blob) {
+ return !Snapshot::ExtractStartupData(snapshot_blob).is_empty() &&
+ !Snapshot::ExtractContextData(snapshot_blob).is_empty();
+}
+#endif // DEBUG
+
+
+bool Snapshot::HaveASnapshotToStartFrom(Isolate* isolate) {
+ // Do not use snapshots if the isolate is used to create snapshots.
+ return isolate->snapshot_blob() != NULL &&
+ isolate->snapshot_blob()->data != NULL;
+}
+
+
+bool Snapshot::EmbedsScript(Isolate* isolate) {
+ if (!isolate->snapshot_available()) return false;
+ return ExtractMetadata(isolate->snapshot_blob()).embeds_script();
+}
+
+
+uint32_t Snapshot::SizeOfFirstPage(Isolate* isolate, AllocationSpace space) {
+ DCHECK(space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE);
+ if (!isolate->snapshot_available()) {
+ return static_cast<uint32_t>(MemoryAllocator::PageAreaSize(space));
+ }
+ uint32_t size;
+ int offset = kFirstPageSizesOffset + (space - FIRST_PAGED_SPACE) * kInt32Size;
+ memcpy(&size, isolate->snapshot_blob()->data + offset, kInt32Size);
+ return size;
+}
+
+
+bool Snapshot::Initialize(Isolate* isolate) {
+ if (!isolate->snapshot_available()) return false;
+ base::ElapsedTimer timer;
+ if (FLAG_profile_deserialization) timer.Start();
+
+ const v8::StartupData* blob = isolate->snapshot_blob();
+ Vector<const byte> startup_data = ExtractStartupData(blob);
+ SnapshotData snapshot_data(startup_data);
+ Deserializer deserializer(&snapshot_data);
+ bool success = isolate->Init(&deserializer);
+ if (FLAG_profile_deserialization) {
+ double ms = timer.Elapsed().InMillisecondsF();
+ int bytes = startup_data.length();
+ PrintF("[Deserializing isolate (%d bytes) took %0.3f ms]\n", bytes, ms);
+ }
+ return success;
+}
+
+
+MaybeHandle<Context> Snapshot::NewContextFromSnapshot(
+ Isolate* isolate, Handle<JSGlobalProxy> global_proxy) {
+ if (!isolate->snapshot_available()) return Handle<Context>();
+ base::ElapsedTimer timer;
+ if (FLAG_profile_deserialization) timer.Start();
+
+ const v8::StartupData* blob = isolate->snapshot_blob();
+ Vector<const byte> context_data = ExtractContextData(blob);
+ SnapshotData snapshot_data(context_data);
+ Deserializer deserializer(&snapshot_data);
+
+ MaybeHandle<Object> maybe_context =
+ deserializer.DeserializePartial(isolate, global_proxy);
+ Handle<Object> result;
+ if (!maybe_context.ToHandle(&result)) return MaybeHandle<Context>();
+ CHECK(result->IsContext());
+ if (FLAG_profile_deserialization) {
+ double ms = timer.Elapsed().InMillisecondsF();
+ int bytes = context_data.length();
+ PrintF("[Deserializing context (%d bytes) took %0.3f ms]\n", bytes, ms);
+ }
+ return Handle<Context>::cast(result);
+}
+
+
+void CalculateFirstPageSizes(bool is_default_snapshot,
+ const SnapshotData& startup_snapshot,
+ const SnapshotData& context_snapshot,
+ uint32_t* sizes_out) {
+ Vector<const SerializedData::Reservation> startup_reservations =
+ startup_snapshot.Reservations();
+ Vector<const SerializedData::Reservation> context_reservations =
+ context_snapshot.Reservations();
+ int startup_index = 0;
+ int context_index = 0;
+
+ if (FLAG_profile_deserialization) {
+ int startup_total = 0;
+ int context_total = 0;
+ for (auto& reservation : startup_reservations) {
+ startup_total += reservation.chunk_size();
+ }
+ for (auto& reservation : context_reservations) {
+ context_total += reservation.chunk_size();
+ }
+ PrintF(
+ "Deserialization will reserve:\n"
+ "%10d bytes per isolate\n"
+ "%10d bytes per context\n",
+ startup_total, context_total);
+ }
+
+ for (int space = 0; space < i::Serializer::kNumberOfSpaces; space++) {
+ bool single_chunk = true;
+ while (!startup_reservations[startup_index].is_last()) {
+ single_chunk = false;
+ startup_index++;
+ }
+ while (!context_reservations[context_index].is_last()) {
+ single_chunk = false;
+ context_index++;
+ }
+
+ uint32_t required = kMaxUInt32;
+ if (single_chunk) {
+ // If both the startup snapshot data and the context snapshot data on
+ // this space fit in a single page, then we consider limiting the size
+ // of the first page. For this, we add the chunk sizes and some extra
+ // allowance. This way we achieve a smaller startup memory footprint.
+ required = (startup_reservations[startup_index].chunk_size() +
+ 2 * context_reservations[context_index].chunk_size()) +
+ Page::kObjectStartOffset;
+ // Add a small allowance to the code space for small scripts.
+ if (space == CODE_SPACE) required += 32 * KB;
+ } else {
+ // We expect the vanilla snapshot to only require on page per space.
+ DCHECK(!is_default_snapshot);
+ }
+
+ if (space >= FIRST_PAGED_SPACE && space <= LAST_PAGED_SPACE) {
+ uint32_t max_size =
+ MemoryAllocator::PageAreaSize(static_cast<AllocationSpace>(space));
+ sizes_out[space - FIRST_PAGED_SPACE] = Min(required, max_size);
+ } else {
+ DCHECK(single_chunk);
+ }
+ startup_index++;
+ context_index++;
+ }
+
+ DCHECK_EQ(startup_reservations.length(), startup_index);
+ DCHECK_EQ(context_reservations.length(), context_index);
+}
+
+
+v8::StartupData Snapshot::CreateSnapshotBlob(
+ const i::StartupSerializer& startup_ser,
+ const i::PartialSerializer& context_ser, Snapshot::Metadata metadata) {
+ SnapshotData startup_snapshot(startup_ser);
+ SnapshotData context_snapshot(context_ser);
+ Vector<const byte> startup_data = startup_snapshot.RawData();
+ Vector<const byte> context_data = context_snapshot.RawData();
+
+ uint32_t first_page_sizes[kNumPagedSpaces];
+
+ CalculateFirstPageSizes(!metadata.embeds_script(), startup_snapshot,
+ context_snapshot, first_page_sizes);
+
+ int startup_length = startup_data.length();
+ int context_length = context_data.length();
+ int context_offset = ContextOffset(startup_length);
+
+ int length = context_offset + context_length;
+ char* data = new char[length];
+
+ memcpy(data + kMetadataOffset, &metadata.RawValue(), kInt32Size);
+ memcpy(data + kFirstPageSizesOffset, first_page_sizes,
+ kNumPagedSpaces * kInt32Size);
+ memcpy(data + kStartupLengthOffset, &startup_length, kInt32Size);
+ memcpy(data + kStartupDataOffset, startup_data.begin(), startup_length);
+ memcpy(data + context_offset, context_data.begin(), context_length);
+ v8::StartupData result = {data, length};
+
+ if (FLAG_profile_deserialization) {
+ PrintF(
+ "Snapshot blob consists of:\n"
+ "%10d bytes for startup\n"
+ "%10d bytes for context\n",
+ startup_length, context_length);
+ }
+ return result;
+}
+
+
+Snapshot::Metadata Snapshot::ExtractMetadata(const v8::StartupData* data) {
+ uint32_t raw;
+ memcpy(&raw, data->data + kMetadataOffset, kInt32Size);
+ return Metadata(raw);
+}
+
+
+Vector<const byte> Snapshot::ExtractStartupData(const v8::StartupData* data) {
+ DCHECK_LT(kIntSize, data->raw_size);
+ int startup_length;
+ memcpy(&startup_length, data->data + kStartupLengthOffset, kInt32Size);
+ DCHECK_LT(startup_length, data->raw_size);
+ const byte* startup_data =
+ reinterpret_cast<const byte*>(data->data + kStartupDataOffset);
+ return Vector<const byte>(startup_data, startup_length);
+}
+
+
+Vector<const byte> Snapshot::ExtractContextData(const v8::StartupData* data) {
+ DCHECK_LT(kIntSize, data->raw_size);
+ int startup_length;
+ memcpy(&startup_length, data->data + kStartupLengthOffset, kIntSize);
+ int context_offset = ContextOffset(startup_length);
+ const byte* context_data =
+ reinterpret_cast<const byte*>(data->data + context_offset);
+ DCHECK_LT(context_offset, data->raw_size);
+ int context_length = data->raw_size - context_offset;
+ return Vector<const byte>(context_data, context_length);
+}
+} // namespace internal
+} // namespace v8