Stream scripts to V8 as they load - Blink side.

Source/bindings/core/v8/V8ScriptRunner.cpp

 /*
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 #include "config.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
+#include "bindings/core/v8/ScriptStreamer.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8RecursionScope.h"
 #include "bindings/core/v8/V8ThrowException.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/CachedMetadata.h"
 #include "core/fetch/ScriptResource.h"
 #include "platform/TraceEvent.h"
 
 namespace blink {
@@ skipping 43 matching lines @@
     // Consume existing cache data:
     CachedMetadata* cachedMetadata = resource->cachedMetadata(cacheTag);
     v8::ScriptCompiler::CachedData* cachedData = new v8::ScriptCompiler::CachedData(
         reinterpret_cast<const uint8_t*>(cachedMetadata->data()),
         cachedMetadata->size(),
         v8::ScriptCompiler::CachedData::BufferNotOwned);
     v8::ScriptCompiler::Source source(code, origin, cachedData);
     return v8::ScriptCompiler::Compile(isolate, &source, options);
 }
 
-unsigned tagForParserCache()
-{
-    return StringHash::hash(v8::V8::GetVersion()) * 2;
-}
-
-unsigned tagForCodeCache()
-{
-    return StringHash::hash(v8::V8::GetVersion()) * 2 + 1;
-}
-
 } // namespace
 
 v8::Local<v8::Script> V8ScriptRunner::compileScript(const ScriptSourceCode& source, v8::Isolate* isolate, AccessControlStatus corsStatus, V8CacheOptions cacheOptions)
 {
-    return compileScript(v8String(isolate, source.source()), source.url(), source.startPosition(), source.resource(), isolate, corsStatus, cacheOptions);
+    return compileScript(v8String(isolate, source.source()), source.url(), source.startPosition(), source.resource(), source.streamer(), isolate, corsStatus, cacheOptions);
 }
 
-v8::Local<v8::Script> V8ScriptRunner::compileScript(v8::Handle<v8::String> code, const String& fileName, const TextPosition& scriptStartPosition, ScriptResource* resource, v8::Isolate* isolate, AccessControlStatus corsStatus, V8CacheOptions cacheOptions)
+v8::Local<v8::Script> V8ScriptRunner::compileScript(v8::Handle<v8::String> code, const String& fileName, const TextPosition& scriptStartPosition, ScriptResource* resource, ScriptStreamer* streamer, v8::Isolate* isolate, AccessControlStatus corsStatus, V8CacheOptions cacheOptions)
 {
     TRACE_EVENT1("v8", "v8.compile", "fileName", fileName.utf8());
     TRACE_EVENT_SCOPED_SAMPLING_STATE("v8", "V8Compile");
 
     // NOTE: For compatibility with WebCore, ScriptSourceCode's line starts at
     // 1, whereas v8 starts at 0.
     v8::Handle<v8::String> name = v8String(isolate, fileName);
     v8::Handle<v8::Integer> line = v8::Integer::New(isolate, scriptStartPosition.m_line.zeroBasedInt());
     v8::Handle<v8::Integer> column = v8::Integer::New(isolate, scriptStartPosition.m_column.zeroBasedInt());
     v8::Handle<v8::Boolean> isSharedCrossOrigin = corsStatus == SharableCrossOrigin ? v8::True(isolate) : v8::False(isolate);
     v8::ScriptOrigin origin(name, line, column, isSharedCrossOrigin);
 
     v8::Local<v8::Script> script;
     unsigned cacheTag = 0;
-    if (!resource || !resource->url().protocolIsInHTTPFamily() || code->Length() < 1024) {
+    if (streamer) {
+        // We don't stream scripts which don't have a Resource.
+        ASSERT(resource);
+        // Failed resources should never get this far.
+        ASSERT(!resource->errorOccurred());
+        script = v8::ScriptCompiler::Compile(isolate, streamer->source(), code, origin);
+        // Whether to produce the cached data or not is decided when the
+        // streamer is started. Here we only need to get the data out.
+        const v8::ScriptCompiler::CachedData* newCachedData = streamer->source()->GetCachedData();
+        if (newCachedData) {
+            resource->clearCachedMetadata();
+            resource->setCachedMetadata(streamer->cachedDataDataType(), reinterpret_cast<const char*>(newCachedData->data), newCachedData->length);
+        }
+    } else if (!resource || !resource->url().protocolIsInHTTPFamily() || code->Length() < 1024) {
         v8::ScriptCompiler::Source source(code, origin);
         script = v8::ScriptCompiler::Compile(isolate, &source, v8::ScriptCompiler::kNoCompileOptions);
     } else {
         switch (cacheOptions) {
         case V8CacheOptionsParse:
             cacheTag = tagForParserCache();

[haraken, 2014/09/10 05:57:51]

Can you use this tagForParserCache() instead of introducing another
tagForParserCache()?

[marja, 2014/09/11 09:15:37]

Hmm? I'm not introducing a new tagForParserCache, I'm just moving it from the
unnamed namespace to V8ScriptRunner, so that ScriptStreamer can access them too.

             script = resource->cachedMetadata(cacheTag)
                 ? compileAndConsumeCache(isolate, code, origin, resource, v8::ScriptCompiler::kConsumeParserCache, cacheTag)
                 : compileAndProduceCache(isolate, code, origin, resource, v8::ScriptCompiler::kProduceParserCache, cacheTag, Resource::SendToPlatform);
             break;
         case V8CacheOptionsCode:
             cacheTag = tagForCodeCache();
             script = resource->cachedMetadata(cacheTag)
                 ? compileAndConsumeCache(isolate, code, origin, resource, v8::ScriptCompiler::kConsumeCodeCache, cacheTag)
                 : compileAndProduceCache(isolate, code, origin, resource, v8::ScriptCompiler::kProduceCodeCache, cacheTag, Resource::SendToPlatform);
             break;
@@ skipping 33 matching lines @@
 
     if (result.IsEmpty())
         return v8::Local<v8::Value>();
 
     crashIfV8IsDead();
     return result;
 }
 
 v8::Local<v8::Value> V8ScriptRunner::compileAndRunInternalScript(v8::Handle<v8::String> source, v8::Isolate* isolate, const String& fileName, const TextPosition& scriptStartPosition)
 {
-    v8::Handle<v8::Script> script = V8ScriptRunner::compileScript(source, fileName, scriptStartPosition, 0, isolate);
+    v8::Handle<v8::Script> script = V8ScriptRunner::compileScript(source, fileName, scriptStartPosition, 0, 0, isolate);
     if (script.IsEmpty())
         return v8::Local<v8::Value>();
 
     TRACE_EVENT0("v8", "v8.run");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("v8", "V8Execution");
     V8RecursionScope::MicrotaskSuppression recursionScope(isolate);
     v8::Local<v8::Value> result = script->Run();
     crashIfV8IsDead();
     return result;
 }
@@ skipping 70 matching lines @@
 v8::Local<v8::Object> V8ScriptRunner::instantiateObjectInDocument(v8::Isolate* isolate, v8::Handle<v8::Function> function, ExecutionContext* context, int argc, v8::Handle<v8::Value> argv[])
 {
     TRACE_EVENT0("v8", "v8.newInstance");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("v8", "V8Execution");
     V8RecursionScope scope(isolate, context);
     v8::Local<v8::Object> result = function->NewInstance(argc, argv);
     crashIfV8IsDead();
     return result;
 }
 
+unsigned V8ScriptRunner::tagForParserCache()
+{
+    return StringHash::hash(v8::V8::GetVersion()) * 2;
+}
+
+unsigned V8ScriptRunner::tagForCodeCache()
+{
+    return StringHash::hash(v8::V8::GetVersion()) * 2 + 1;
+}
+
 } // namespace blink