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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCRIPT_FORBIDDEN_SCOPE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCRIPT_FORBIDDEN_SCOPE_H_
#include "base/auto_reset.h"
#include "base/macros.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/stack_util.h"
#include "third_party/blink/renderer/platform/wtf/wtf.h"
namespace blink {
// Scoped disabling of script execution.
class PLATFORM_EXPORT ScriptForbiddenScope final {
STACK_ALLOCATED();
DISALLOW_COPY_AND_ASSIGN(ScriptForbiddenScope);
public:
ScriptForbiddenScope() { Enter(); }
~ScriptForbiddenScope() { Exit(); }
class PLATFORM_EXPORT AllowUserAgentScript final {
STACK_ALLOCATED();
DISALLOW_COPY_AND_ASSIGN(AllowUserAgentScript);
public:
AllowUserAgentScript() : saved_counter_(&GetMutableCounter(), 0) {}
~AllowUserAgentScript() { DCHECK(!IsScriptForbidden()); }
private:
base::AutoReset<unsigned> saved_counter_;
};
static bool IsScriptForbidden() {
if (LIKELY(!WTF::MayNotBeMainThread()))
return g_main_thread_counter_ > 0;
return GetMutableCounter() > 0;
}
// DO NOT USE THESE FUNCTIONS FROM OUTSIDE OF THIS CLASS.
static void Enter() {
if (LIKELY(!WTF::MayNotBeMainThread())) {
++g_main_thread_counter_;
} else {
++GetMutableCounter();
}
}
static void Exit() {
DCHECK(IsScriptForbidden());
if (LIKELY(!WTF::MayNotBeMainThread())) {
--g_main_thread_counter_;
} else {
--GetMutableCounter();
}
}
private:
static unsigned& GetMutableCounter();
static unsigned g_main_thread_counter_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCRIPT_FORBIDDEN_SCOPE_H_
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