91d5c2a035
Commit c15aa241f821 ("[CLANG][BPF] change __builtin_preserve_access_index()
signature") changed the builtin function signature to
PointerT __builtin_preserve_access_index(PointerT ptr)
with a pointer type as the argument/return type, where argument and
return types must be the same.
There is really no reason for this constraint. The builtin just
presented a code region so that IR builtins
__builtin_{array, struct, union}_preserve_access_index
can be applied.
This patch removed the pointer type restriction to permit any
argument type as long as it is permitted by the compiler.
Differential Revision: https://reviews.llvm.org/D67883
llvm-svn: 372516
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
// RUN: %clang_cc1 -x c -triple x86_64-pc-linux-gnu -dwarf-version=4 -fsyntax-only -verify %s
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const void *invalid1(const int *arg) {
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return __builtin_preserve_access_index(&arg[1], 1); // expected-error {{too many arguments to function call, expected 1, have 2}}
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}
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int valid2(void) {
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return __builtin_preserve_access_index(1);
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}
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void *invalid3(const int *arg) {
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return __builtin_preserve_access_index(&arg[1]); // expected-warning {{returning 'const int *' from a function with result type 'void *' discards qualifiers}}
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}
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const void *invalid4(volatile const int *arg) {
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return __builtin_preserve_access_index(arg); // expected-warning {{returning 'const volatile int *' from a function with result type 'const void *' discards qualifiers}}
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}
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int *valid5(int *arg) {
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return __builtin_preserve_access_index(arg);
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}
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int valid6(const volatile int *arg) {
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return *__builtin_preserve_access_index(arg);
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}
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struct s { int a; int b; };
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int valid7(struct s *arg) {
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return *__builtin_preserve_access_index(&arg->b);
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}
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int valid8(struct s *arg) {
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return __builtin_preserve_access_index(arg->a + arg->b);
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}
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int valid9(struct s *arg) {
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return __builtin_preserve_access_index(({arg->a = 2; arg->b = 3; }));
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}
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