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// 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.
#import "base/mac/scoped_nsexception_enabler.h"
#import "base/lazy_instance.h"
#import "base/threading/thread_local.h"
// To make the |g_exceptionsAllowed| declaration readable.
using base::LazyInstance;
using base::ThreadLocalBoolean;
// When C++ exceptions are disabled, the C++ library defines |try| and
// |catch| so as to allow exception-expecting C++ code to build properly when
// language support for exceptions is not present. These macros interfere
// with the use of |@try| and |@catch| in Objective-C files such as this one.
// Undefine these macros here, after everything has been #included, since
// there will be no C++ uses and only Objective-C uses from this point on.
#undef try
#undef catch
namespace {
// Whether to allow NSExceptions to be raised on the current thread.
LazyInstance<ThreadLocalBoolean>::Leaky
g_exceptionsAllowed = LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace base {
namespace mac {
bool GetNSExceptionsAllowed() {
return g_exceptionsAllowed.Get().Get();
}
void SetNSExceptionsAllowed(bool allowed) {
return g_exceptionsAllowed.Get().Set(allowed);
}
id RunBlockIgnoringExceptions(BlockReturningId block) {
id ret = nil;
@try {
base::mac::ScopedNSExceptionEnabler enable;
ret = block();
}
@catch(id exception) {
}
return ret;
}
ScopedNSExceptionEnabler::ScopedNSExceptionEnabler() {
was_enabled_ = GetNSExceptionsAllowed();
SetNSExceptionsAllowed(true);
}
ScopedNSExceptionEnabler::~ScopedNSExceptionEnabler() {
SetNSExceptionsAllowed(was_enabled_);
}
} // namespace mac
} // namespace base
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