70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
//===---------------------- backtrace_test.cpp ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: libcxxabi-no-exceptions
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#include <assert.h>
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#include <stddef.h>
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#include <unwind.h>
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extern "C" _Unwind_Reason_Code
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trace_function(struct _Unwind_Context* context, void* ntraced) {
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(*reinterpret_cast<size_t*>(ntraced))++;
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// We should never have a call stack this deep...
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assert(*reinterpret_cast<size_t*>(ntraced) < 20);
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return _URC_NO_REASON;
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}
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__attribute__ ((__noinline__))
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void call3_throw(size_t* ntraced) {
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try {
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_Unwind_Backtrace(trace_function, ntraced);
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} catch (...) {
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assert(false);
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}
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}
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__attribute__ ((__noinline__, __disable_tail_calls__))
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void call3_nothrow(size_t* ntraced) {
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_Unwind_Backtrace(trace_function, ntraced);
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}
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__attribute__ ((__noinline__, __disable_tail_calls__))
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void call2(size_t* ntraced, bool do_throw) {
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if (do_throw) {
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call3_throw(ntraced);
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} else {
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call3_nothrow(ntraced);
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}
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}
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__attribute__ ((__noinline__, __disable_tail_calls__))
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void call1(size_t* ntraced, bool do_throw) {
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call2(ntraced, do_throw);
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}
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int main() {
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size_t throw_ntraced = 0;
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size_t nothrow_ntraced = 0;
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call1(¬hrow_ntraced, false);
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try {
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call1(&throw_ntraced, true);
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} catch (...) {
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assert(false);
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}
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// Different platforms (and different runtimes) will unwind a different number
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// of times, so we can't make any better assumptions than this.
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assert(nothrow_ntraced > 1);
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assert(throw_ntraced == nothrow_ntraced); // Make sure we unwind through catch
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return 0;
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}
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