- Diagnostics relating to macros on the command line of a preprocessed assembly
file are now reported as coming from the file ``<command line>`` instead of
``<built-in>``.
+- Clang constexpr evaluator now provides a more concise diagnostic when calling
+ function pointer that is known to be null.
Bug Fixes in This Version
-------------------------
"access array element of|perform pointer arithmetic on|"
"access real component of|"
"access imaginary component of}0 null pointer">;
+def note_constexpr_null_callee : Note<
+ "'%0' evaluates to a null function pointer">;
def note_constexpr_function_param_value_unknown : Note<
"function parameter %0 with unknown value cannot be used in a constant "
"expression">;
if (!CalleeLV.getLValueOffset().isZero())
return Error(Callee);
+ if (CalleeLV.isNullPointer()) {
+ Info.FFDiag(Callee, diag::note_constexpr_null_callee)
+ << const_cast<Expr *>(Callee);
+ return false;
+ }
FD = dyn_cast_or_null<FunctionDecl>(
CalleeLV.getLValueBase().dyn_cast<const ValueDecl *>());
if (!FD)
constexpr auto Select(int n) -> int (*)(int) {
return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0;
}
- constexpr int Apply(int (*F)(int), int n) { return F(n); } // expected-note {{subexpression}}
+ constexpr int Apply(int (*F)(int), int n) { return F(n); } // expected-note {{'F' evaluates to a null function pointer}}
static_assert(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, "");