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libstdc++: Add comment to nothrow new explaining catch (...)

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The decision to not rethrow a __forced_unwind exception is deliberate,
so add a comment explaining it.

libstdc++-v3/ChangeLog:

	* libsupc++/new_opnt.cc (new): Add comment about forced unwind
	exceptions.
This commit is contained in:
Jonathan Wakely 2020-10-28 13:19:21 +00:00
parent 0bc199fc5d
commit c227d96feb
1 changed files with 7 additions and 3 deletions
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10
libstdc++-v3/libsupc++/new_opnt.cc
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@ -26,9 +26,6 @@
#include <bits/exception_defines.h> #include <bits/exception_defines.h>
#include "new" #include "new"
using std::new_handler;
using std::bad_alloc;
extern "C" void *malloc (std::size_t); extern "C" void *malloc (std::size_t);
_GLIBCXX_WEAK_DEFINITION void * _GLIBCXX_WEAK_DEFINITION void *
@ -43,6 +40,13 @@ operator new (std::size_t sz, const std::nothrow_t&) noexcept
} }
__catch (...) __catch (...)
{ {
// N.B. catch (...) means the process will terminate if operator new(sz)
// exits with a __forced_unwind exception. The process will print
// "FATAL: exception not rethrown" to stderr before exiting.
//
// If we propagated that exception the process would still terminate
// (because this function is noexcept) but with a less informative error:
// "terminate called without active exception".
return nullptr; return nullptr;
} }
} }