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Nathaniel Shead 5ba949c096 c++: Check null pointer deref when calling memfn in constexpr [PR102420]
Calling a non-static member function on a null pointer is undefined
behaviour (see [expr.ref] p8) and should error in constant evaluation,
even if the 'this' pointer is never actually accessed within that
function.

One catch is that currently, the function pointer conversion operator
for lambdas passes a null pointer as the 'this' pointer to the
underlying 'operator()', so for now we ignore such calls.

	PR c++/102420

gcc/cp/ChangeLog:

	* constexpr.cc (cxx_bind_parameters_in_call): Check for calling
	non-static member functions with a null pointer.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/constexpr-memfn2.C: New test.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
2023-12-20 08:18:56 +11:00
.github Minor formatting fix for newly-added file from previous commit 2023-11-01 19:28:56 -04:00
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gcc c++: Check null pointer deref when calling memfn in constexpr [PR102420] 2023-12-20 08:18:56 +11:00
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config-ml.in LoongArch: Reimplement multilib build option handling. 2023-09-15 10:42:12 +08:00
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configure build: Add libgrust as compilation modules 2023-12-14 13:58:57 +01:00
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