Cache csi info before passing it to JS setters.

chrome/renderer/loadtimes_extension_bindings.cc

 // Copyright (c) 2012 The Chromium 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 "chrome/renderer/loadtimes_extension_bindings.h"
 
 #include <math.h>
 
 #include "base/time/time.h"
 #include "content/public/renderer/document_state.h"
@@ skipping 80 matching lines @@
         return kTransitionForwardBack;
       case blink::WebNavigationTypeReload:
         return kTransitionReload;
       case blink::WebNavigationTypeOther:
         return kTransitionOther;
     }
     return kTransitionOther;
   }
 
   static void GetLoadTimes(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    args.GetReturnValue().SetNull();
     WebLocalFrame* frame = WebLocalFrame::frameForCurrentContext();
     if (!frame) {
-      args.GetReturnValue().SetNull();
       return;
     }
     WebDataSource* data_source = frame->dataSource();
     if (!data_source) {
-      args.GetReturnValue().SetNull();
       return;
     }
     DocumentState* document_state = DocumentState::FromDataSource(data_source);
     if (!document_state) {
-      args.GetReturnValue().SetNull();
       return;
     }
     double request_time = document_state->request_time().ToDoubleT();
     double start_load_time = document_state->start_load_time().ToDoubleT();
     double commit_load_time = document_state->commit_load_time().ToDoubleT();
     double finish_document_load_time =
         document_state->finish_document_load_time().ToDoubleT();
     double finish_load_time = document_state->finish_load_time().ToDoubleT();
     double first_paint_time = document_state->first_paint_time().ToDoubleT();
     double first_paint_after_load_time =
         document_state->first_paint_after_load_time().ToDoubleT();
     std::string navigation_type =
         GetNavigationType(data_source->navigationType());
     bool was_fetched_via_spdy = document_state->was_fetched_via_spdy();
     bool was_npn_negotiated = document_state->was_npn_negotiated();
     std::string npn_negotiated_protocol =
         document_state->npn_negotiated_protocol();
     bool was_alternate_protocol_available =
         document_state->was_alternate_protocol_available();
     std::string connection_info = net::HttpResponseInfo::ConnectionInfoToString(
         document_state->connection_info());
     // Important: |frame|, |data_source| and |document_state| should not be
     // referred to below this line, as JS setters below can invalidate these
     // pointers.
     v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Context> ctx = isolate->GetCurrentContext();
     v8::Local<v8::Object> load_times = v8::Object::New(isolate);
-    load_times->Set(v8::String::NewFromUtf8(isolate, "requestTime"),
-                    v8::Number::New(isolate, request_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "startLoadTime"),
-                    v8::Number::New(isolate, start_load_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "commitLoadTime"),
-                    v8::Number::New(isolate, commit_load_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "finishDocumentLoadTime"),
-                    v8::Number::New(isolate, finish_document_load_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "finishLoadTime"),
-                    v8::Number::New(isolate, finish_load_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "firstPaintTime"),
-                    v8::Number::New(isolate, first_paint_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "firstPaintAfterLoadTime"),
-                    v8::Number::New(isolate, first_paint_after_load_time));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "navigationType"),
-                    v8::String::NewFromUtf8(isolate, navigation_type.c_str()));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "wasFetchedViaSpdy"),
-                    v8::Boolean::New(isolate, was_fetched_via_spdy));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "wasNpnNegotiated"),
-                    v8::Boolean::New(isolate, was_npn_negotiated));
-    load_times->Set(
-        v8::String::NewFromUtf8(isolate, "npnNegotiatedProtocol"),
-        v8::String::NewFromUtf8(isolate, npn_negotiated_protocol.c_str()));
-    load_times->Set(
-        v8::String::NewFromUtf8(isolate, "wasAlternateProtocolAvailable"),
-        v8::Boolean::New(isolate, was_alternate_protocol_available));
-    load_times->Set(v8::String::NewFromUtf8(isolate, "connectionInfo"),
-                    v8::String::NewFromUtf8(isolate, connection_info.c_str()));
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "requestTime",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Number::New(isolate, request_time))
+             .FromMaybe(false)) {
+      return;
+    }
+
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "startLoadTime",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Number::New(isolate, start_load_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "commitLoadTime",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Number::New(isolate, commit_load_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx,
+                   v8::String::NewFromUtf8(isolate, "finishDocumentLoadTime",
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked(),
+                   v8::Number::New(isolate, finish_document_load_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "finishLoadTime",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Number::New(isolate, finish_load_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "firstPaintTime",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Number::New(isolate, first_paint_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx,
+                   v8::String::NewFromUtf8(isolate, "firstPaintAfterLoadTime",
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked(),
+                   v8::Number::New(isolate, first_paint_after_load_time))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "navigationType",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::String::NewFromUtf8(isolate, navigation_type.c_str(),
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked())
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "wasFetchedViaSpdy",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Boolean::New(isolate, was_fetched_via_spdy))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "wasNpnNegotiated",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Boolean::New(isolate, was_npn_negotiated))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx,
+                   v8::String::NewFromUtf8(isolate, "npnNegotiatedProtocol",
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked(),
+                   v8::String::NewFromUtf8(isolate,
+                                           npn_negotiated_protocol.c_str(),
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked())
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate,
+                                                "wasAlternateProtocolAvailable",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::Boolean::New(isolate, was_alternate_protocol_available))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!load_times
+             ->Set(ctx, v8::String::NewFromUtf8(isolate, "connectionInfo",
+                                                v8::NewStringType::kNormal)
+                            .ToLocalChecked(),
+                   v8::String::NewFromUtf8(isolate, connection_info.c_str(),
+                                           v8::NewStringType::kNormal)
+                       .ToLocalChecked())
+             .FromMaybe(false)) {
+      return;
+    }
     args.GetReturnValue().Set(load_times);
   }
 
   static void GetCSI(const v8::FunctionCallbackInfo<v8::Value>& args) {
+    args.GetReturnValue().SetNull();
     WebLocalFrame* frame = WebLocalFrame::frameForCurrentContext();
-    if (frame) {
-      WebDataSource* data_source = frame->dataSource();
-      if (data_source) {
-        DocumentState* document_state =
-            DocumentState::FromDataSource(data_source);
-        v8::Isolate* isolate = args.GetIsolate();
-        v8::Local<v8::Object> csi = v8::Object::New(isolate);
-        base::Time now = base::Time::Now();
-        base::Time start = document_state->request_time().is_null() ?
-            document_state->start_load_time() :
-            document_state->request_time();
-        base::Time onload = document_state->finish_document_load_time();
-        base::TimeDelta page = now - start;
-        csi->Set(v8::String::NewFromUtf8(isolate, "startE"),
-                 v8::Number::New(isolate, floor(start.ToDoubleT() * 1000)));
-        csi->Set(v8::String::NewFromUtf8(isolate, "onloadT"),
-                 v8::Number::New(isolate, floor(onload.ToDoubleT() * 1000)));
-        csi->Set(v8::String::NewFromUtf8(isolate, "pageT"),
-                 v8::Number::New(isolate, page.InMillisecondsF()));
-        csi->Set(
-            v8::String::NewFromUtf8(isolate, "tran"),
-            v8::Number::New(
-                isolate, GetCSITransitionType(data_source->navigationType())));
-
-        args.GetReturnValue().Set(csi);
-        return;
-      }
+    if (!frame) {
+      return;
     }
-    args.GetReturnValue().SetNull();
-    return;
+    WebDataSource* data_source = frame->dataSource();
+    if (!data_source) {
+      return;
+    }
+    DocumentState* document_state = DocumentState::FromDataSource(data_source);
+    if (!document_state) {
+      return;
+    }
+    base::Time now = base::Time::Now();
+    base::Time start = document_state->request_time().is_null()
+                           ? document_state->start_load_time()
+                           : document_state->request_time();
+    base::Time onload = document_state->finish_document_load_time();
+    base::TimeDelta page = now - start;
+    int navigation_type = GetCSITransitionType(data_source->navigationType());
+    // Important: |frame|, |data_source| and |document_state| should not be
+    // referred to below this line, as JS setters below can invalidate these
+    // pointers.
+    v8::Isolate* isolate = args.GetIsolate();
+    v8::Local<v8::Context> ctx = isolate->GetCurrentContext();
+    v8::Local<v8::Object> csi = v8::Object::New(isolate);
+    if (!csi->Set(ctx, v8::String::NewFromUtf8(isolate, "startE",
+                                               v8::NewStringType::kNormal)
+                           .ToLocalChecked(),
+                  v8::Number::New(isolate, floor(start.ToDoubleT() * 1000)))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!csi->Set(ctx, v8::String::NewFromUtf8(isolate, "onloadT",
+                                               v8::NewStringType::kNormal)
+                           .ToLocalChecked(),
+                  v8::Number::New(isolate, floor(onload.ToDoubleT() * 1000)))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!csi->Set(ctx, v8::String::NewFromUtf8(isolate, "pageT",
+                                               v8::NewStringType::kNormal)
+                           .ToLocalChecked(),
+                  v8::Number::New(isolate, page.InMillisecondsF()))
+             .FromMaybe(false)) {
+      return;
+    }
+    if (!csi->Set(ctx, v8::String::NewFromUtf8(isolate, "tran",
+                                               v8::NewStringType::kNormal)
+                           .ToLocalChecked(),
+                  v8::Number::New(isolate, navigation_type))
+             .FromMaybe(false)) {
+      return;
+    }
+    args.GetReturnValue().Set(csi);
   }
 };
 
 v8::Extension* LoadTimesExtension::Get() {
   return new LoadTimesExtensionWrapper();
 }
 
 }  // namespace extensions_v8