Re-land: Reimplement automation API on top of C++-backed AXTree.

extensions/renderer/script_context.cc

 // Copyright 2014 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 "extensions/renderer/script_context.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 40 matching lines @@
       return "WEB_PAGE";
     case Feature::BLESSED_WEB_PAGE_CONTEXT:
       return "BLESSED_WEB_PAGE";
     case Feature::WEBUI_CONTEXT:
       return "WEBUI";
   }
   NOTREACHED();
   return std::string();
 }
 
+static std::string ToStringOrDefault(
+    const v8::Local<v8::String>& v8_string,
+    const std::string& dflt) {
+  if (v8_string.IsEmpty())
+    return dflt;
+  std::string ascii_value = *v8::String::Utf8Value(v8_string);
+  return ascii_value.empty() ? dflt : ascii_value;
+}
+
 }  // namespace
 
 // A gin::Runner that delegates to its ScriptContext.
 class ScriptContext::Runner : public gin::Runner {
  public:
   explicit Runner(ScriptContext* context);
 
   // gin::Runner overrides.
   void Run(const std::string& source,
            const std::string& resource_name) override;
@@ skipping 295 matching lines @@
       "  context_type:           %s\n"
       "  effective extension id: %s\n"
       "  effective context type: %s",
       extension_.get() ? extension_->id().c_str() : "(none)", web_frame_,
       GetURL().spec().c_str(), GetContextTypeDescription().c_str(),
       effective_extension_.get() ? effective_extension_->id().c_str()
                                  : "(none)",
       GetEffectiveContextTypeDescription().c_str());
 }
 
+std::string ScriptContext::GetStackTraceAsString() const {
+  v8::Local<v8::StackTrace> stack_trace =
+      v8::StackTrace::CurrentStackTrace(isolate(), 10);
+  if (stack_trace.IsEmpty() || stack_trace->GetFrameCount() <= 0) {
+    return "    <no stack trace>";
+  } else {
+    std::string result;
+    for (int i = 0; i < stack_trace->GetFrameCount(); ++i) {
+      v8::Local<v8::StackFrame> frame = stack_trace->GetFrame(i);
+      CHECK(!frame.IsEmpty());
+      result += base::StringPrintf(
+          "\n    at %s (%s:%d:%d)",
+          ToStringOrDefault(frame->GetFunctionName(), "<anonymous>").c_str(),
+          ToStringOrDefault(frame->GetScriptName(), "<anonymous>").c_str(),
+          frame->GetLineNumber(),
+          frame->GetColumn());
+    }
+    return result;
+  }
+}
+
 ScriptContext::Runner::Runner(ScriptContext* context) : context_(context) {
 }
 
 void ScriptContext::Runner::Run(const std::string& source,
                                 const std::string& resource_name) {
   context_->module_system()->RunString(source, resource_name);
 }
 
 v8::Local<v8::Value> ScriptContext::Runner::Call(
     v8::Local<v8::Function> function,
     v8::Local<v8::Value> receiver,
     int argc,
     v8::Local<v8::Value> argv[]) {
   return context_->CallFunction(function, argc, argv);
 }
 
 gin::ContextHolder* ScriptContext::Runner::GetContextHolder() {
   v8::HandleScope handle_scope(context_->isolate());
   return gin::PerContextData::From(context_->v8_context())->context_holder();
 }
 
 }  // namespace extensions