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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/apple/call_with_eh_frame.h"
#include <stdint.h>
#include <unwind.h>
namespace base::apple {
#if defined(__x86_64__) || defined(__aarch64__)
extern "C" _Unwind_Reason_Code __gxx_personality_v0(int,
_Unwind_Action,
uint64_t,
struct _Unwind_Exception*,
struct _Unwind_Context*);
_Unwind_Reason_Code CxxPersonalityRoutine(
int version,
_Unwind_Action actions,
uint64_t exception_class,
struct _Unwind_Exception* exception_object,
struct _Unwind_Context* context) {
// Unwinding is a two-phase process: phase one searches for an exception
// handler, and phase two performs cleanup. For phase one, this custom
// personality will terminate the search. For phase two, this should delegate
// back to the standard personality routine.
if ((actions & _UA_SEARCH_PHASE) != 0) {
// Tell libunwind that this is the end of the stack. When it encounters the
// CallWithEHFrame, it will stop searching for an exception handler. The
// result is that no exception handler has been found higher on the stack,
// and any that are lower on the stack (e.g. in CFRunLoopRunSpecific), will
// now be skipped. Since this is reporting the end of the stack, and no
// exception handler will have been found, std::terminate() will be called.
return _URC_END_OF_STACK;
}
return __gxx_personality_v0(version, actions, exception_class,
exception_object, context);
}
#else // !defined(__x86_64__) && !defined(__aarch64__)
// No implementation exists, so just call the block directly.
void CallWithEHFrame(void (^block)(void)) {
block();
}
#endif // defined(__x86_64__) || defined(__aarch64__)
} // namespace base::apple
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