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// 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 "content/renderer/pepper/pepper_try_catch.h"
#include "content/renderer/pepper/pepper_plugin_instance_impl.h"
#include "content/renderer/pepper/v8_var_converter.h"
#include "gin/converter.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/var_tracker.h"
namespace content {
namespace {
const char kConversionException[] =
"Error: Failed conversion between PP_Var and V8 value";
const char kInvalidException[] = "Error: An invalid exception was thrown.";
} // namespace
PepperTryCatch::PepperTryCatch(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter)
: instance_(instance), var_converter_(var_converter) {}
PepperTryCatch::~PepperTryCatch() {}
v8::Local<v8::Value> PepperTryCatch::ToV8(PP_Var var) {
if (HasException()) {
SetException(kConversionException);
return v8::Local<v8::Value>();
}
v8::Local<v8::Value> result;
bool success = var_converter_->ToV8Value(var, GetContext(), &result);
if (!success) {
SetException(kConversionException);
return v8::Local<v8::Value>();
}
return result;
}
ppapi::ScopedPPVar PepperTryCatch::FromV8(v8::Local<v8::Value> v8_value) {
if (HasException() || v8_value.IsEmpty()) {
SetException(kConversionException);
return ppapi::ScopedPPVar();
}
ppapi::ScopedPPVar result;
bool success =
var_converter_->FromV8ValueSync(v8_value, GetContext(), &result);
if (!success) {
SetException(kConversionException);
return ppapi::ScopedPPVar();
}
return result;
}
PepperTryCatchV8::PepperTryCatchV8(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter,
v8::Isolate* isolate)
: PepperTryCatch(instance, var_converter),
exception_(PP_MakeUndefined()) {
// Typically when using PepperTryCatchV8 we are passed an isolate. We verify
// that this isolate is the same as the plugin isolate.
DCHECK(isolate == instance_->GetIsolate());
// We assume that a handle scope and context has been setup by the user of
// this class. This is typically true because this class is used when calling
// into the plugin from JavaScript. We want to use whatever v8 context the
// caller is in.
}
PepperTryCatchV8::~PepperTryCatchV8() {
ppapi::PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(exception_);
}
bool PepperTryCatchV8::HasException() {
return GetContext().IsEmpty() || exception_.type != PP_VARTYPE_UNDEFINED;
}
v8::Local<v8::Context> PepperTryCatchV8::GetContext() {
// When calling from JS into the plugin always use the current context.
return instance_->GetIsolate()->GetCurrentContext();
}
bool PepperTryCatchV8::ThrowException() {
if (!HasException())
return false;
// If there is no context then we have an exception but we don't try to throw
// it into v8.
if (GetContext().IsEmpty())
return true;
std::string message(kInvalidException);
ppapi::StringVar* message_var = ppapi::StringVar::FromPPVar(exception_);
if (message_var)
message = message_var->value();
instance_->GetIsolate()->ThrowException(v8::Exception::Error(
gin::StringToV8(instance_->GetIsolate(), message)));
ppapi::PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(exception_);
exception_ = PP_MakeUndefined();
return true;
}
void PepperTryCatchV8::ThrowException(const char* message) {
SetException(message);
ThrowException();
}
void PepperTryCatchV8::SetException(const char* message) {
if (HasException())
return;
exception_ = ppapi::StringVar::StringToPPVar(message);
}
PepperTryCatchVar::PepperTryCatchVar(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter,
PP_Var* exception)
: PepperTryCatch(instance, var_converter),
handle_scope_(instance_->GetIsolate()),
try_catch_(instance_->GetIsolate()),
exception_(exception),
exception_is_set_(false) {
// Store a handle to the context here for 2 reasons:
// 1) To hold a handle to it in case all other handles are destroyed.
// 2) Because calling PepperPluginInstanceImpl::GetMainWorldContext() later
// can result in trying to access the plugin element. However the plugin
// element may have been destroyed during the PepperTryCatchVar (for
// example if a script is executed which destroys the plugin element). So
// we want to avoid accessing the plugin element again beyond this point.
context_ = instance_->GetMainWorldContext();
// We switch to the plugin context if it's not empty.
if (!context_.IsEmpty())
context_->Enter();
}
PepperTryCatchVar::~PepperTryCatchVar() {
if (!context_.IsEmpty())
context_->Exit();
}
bool PepperTryCatchVar::HasException() {
if (exception_is_set_)
return true;
std::string exception_message;
if (context_.IsEmpty()) {
exception_message = "The v8 context has been destroyed.";
} else if (try_catch_.HasCaught()) {
v8::Local<v8::Message> message(try_catch_.Message());
if (!message.IsEmpty()) {
v8::String::Utf8Value utf8(handle_scope_.GetIsolate(),
try_catch_.Message()->Get());
exception_message = std::string(*utf8, utf8.length());
} else {
exception_message = "There was a v8 exception.";
}
}
if (!exception_message.empty()) {
exception_is_set_ = true;
if (exception_)
*exception_ = ppapi::StringVar::StringToPPVar(exception_message);
}
return exception_is_set_;
}
v8::Local<v8::Context> PepperTryCatchVar::GetContext() {
return context_;
}
void PepperTryCatchVar::SetException(const char* message) {
if (exception_is_set_)
return;
if (exception_)
*exception_ = ppapi::StringVar::StringToPPVar(message, strlen(message));
exception_is_set_ = true;
}
} // namespace content
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