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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.
#ifndef CONTENT_RENDERER_PEPPER_PEPPER_TRY_CATCH_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_TRY_CATCH_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/shared_impl/scoped_pp_var.h"
#include "v8/include/v8.h"
namespace content {
class PepperPluginInstanceImpl;
class V8VarConverter;
// Base class for scripting TryCatch helpers.
class CONTENT_EXPORT PepperTryCatch {
public:
// PepperTryCatch objects should only be used as stack variables. This object
// takes a reference on the given PepperPluginInstanceImpl.
PepperTryCatch(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter);
virtual ~PepperTryCatch();
virtual void SetException(const char* message) = 0;
virtual bool HasException() = 0;
// Gets the context to execute scripts in.
virtual v8::Local<v8::Context> GetContext() = 0;
// Convenience functions for doing conversions to/from V8 values and sets an
// exception if there is an error in the conversion.
v8::Local<v8::Value> ToV8(PP_Var var);
ppapi::ScopedPPVar FromV8(v8::Local<v8::Value> v8_value);
protected:
// Make sure that |instance_| is alive for the lifetime of PepperTryCatch.
// PepperTryCatch is used mostly in Pepper scripting code, where it can be
// possible to enter JavaScript synchronously which can cause the plugin to
// be deleted.
//
// Note that PepperTryCatch objects should only ever be on the stack, so this
// shouldn't keep the instance around for too long.
scoped_refptr<PepperPluginInstanceImpl> instance_;
V8VarConverter* var_converter_;
};
// Catches var exceptions and emits a v8 exception.
class PepperTryCatchV8 : public PepperTryCatch {
public:
PepperTryCatchV8(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter,
v8::Isolate* isolate);
~PepperTryCatchV8() override;
bool ThrowException();
void ThrowException(const char* message);
PP_Var* exception() { return &exception_; }
// PepperTryCatch
void SetException(const char* message) override;
bool HasException() override;
v8::Local<v8::Context> GetContext() override;
private:
PP_Var exception_;
DISALLOW_COPY_AND_ASSIGN(PepperTryCatchV8);
};
// Catches v8 exceptions and emits a var exception.
class PepperTryCatchVar : public PepperTryCatch {
public:
// The PP_Var exception will be placed in |exception|. The user of this class
// is responsible for managing the lifetime of the exception. It is valid to
// pass NULL for |exception| in which case no exception will be set.
PepperTryCatchVar(PepperPluginInstanceImpl* instance,
V8VarConverter* var_converter,
PP_Var* exception);
~PepperTryCatchVar() override;
// PepperTryCatch
void SetException(const char* message) override;
bool HasException() override;
v8::Local<v8::Context> GetContext() override;
private:
// Code which uses PepperTryCatchVar doesn't typically have a HandleScope,
// make one for them. Note that this class is always allocated on the stack.
v8::HandleScope handle_scope_;
v8::Local<v8::Context> context_;
v8::TryCatch try_catch_;
PP_Var* exception_;
bool exception_is_set_;
DISALLOW_COPY_AND_ASSIGN(PepperTryCatchVar);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PEPPER_TRY_CATCH_H_
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