576161cb60
Unlike C++, C allows the definition of an uninitialized `const` object. If the object has static or thread storage duration, it is still zero-initialized, otherwise, the object is left uninitialized. In either case, the code is not compatible with C++. This adds a new diagnostic group, `-Wdefault-const-init-unsafe`, which is on by default and diagnoses any definition of a `const` object which remains uninitialized. It also adds another new diagnostic group, `-Wdefault-const-init` (which also enabled the `unsafe` variant) that diagnoses any definition of a `const` object (including ones which are zero-initialized). This diagnostic is off by default. Finally, it adds `-Wdefault-const-init` to `-Wc++-compat`. GCC diagnoses these situations under this flag. Fixes #19297
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
// RUN: %clang_cc1 -x c -triple bpf-pc-linux-gnu -dwarf-version=4 -fsyntax-only -verify %s
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struct s {
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int a;
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int b[4];
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int c:1;
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};
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union u {
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int a;
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int b[4];
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int c:1;
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};
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typedef struct {
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int a;
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int b;
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} __t;
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typedef int (*__f)(void);
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enum AA {
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VAL1 = 10,
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VAL2 = 0xffffffff80000000UL,
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};
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typedef enum {
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VAL10 = 10,
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VAL11 = 11,
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} __BB;
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unsigned invalid1(const int *arg) {
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return __builtin_preserve_field_info(arg, 1); // expected-error {{__builtin_preserve_field_info argument 1 not a field access}}
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}
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unsigned invalid2(const int *arg) {
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return __builtin_preserve_field_info(*arg, 1); // expected-error {{__builtin_preserve_field_info argument 1 not a field access}}
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}
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void *invalid3(struct s *arg) {
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return __builtin_preserve_field_info(arg->a, 1); // expected-error {{incompatible integer to pointer conversion returning 'unsigned int' from a function with result type 'void *'}}
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}
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unsigned valid4(struct s *arg) {
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return __builtin_preserve_field_info(arg->b[1], 1);
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}
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unsigned valid5(union u *arg) {
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return __builtin_preserve_field_info(arg->b[2], 1);
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}
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unsigned valid6(struct s *arg) {
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return __builtin_preserve_field_info(arg->a, 1);
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}
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unsigned valid7(struct s *arg) {
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return __builtin_preserve_field_info(arg->c, 1ULL);
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}
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unsigned valid8(union u *arg) {
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return __builtin_preserve_field_info(arg->a, 1);
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}
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unsigned valid9(union u *arg) {
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return __builtin_preserve_field_info(arg->c, 'a');
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}
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unsigned invalid10(struct s *arg) {
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return __builtin_preserve_field_info(arg->a, arg); // expected-error {{__builtin_preserve_field_info argument 2 not a constant}}
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}
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unsigned invalid11(struct s *arg, int info_kind) {
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return __builtin_preserve_field_info(arg->a, info_kind); // expected-error {{__builtin_preserve_field_info argument 2 not a constant}}
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}
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unsigned valid12(void) {
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const struct s t = {};
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return __builtin_preserve_type_info(t, 0) +
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__builtin_preserve_type_info(*(struct s *)0, 1);
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}
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unsigned valid13(void) {
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__t t;
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return __builtin_preserve_type_info(t, 1) +
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__builtin_preserve_type_info(*(__t *)0, 0);
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}
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unsigned valid14(void) {
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enum AA t;
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return __builtin_preserve_type_info(t, 0) +
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__builtin_preserve_type_info(*(enum AA *)0, 1);
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}
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unsigned valid15(void) {
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return __builtin_preserve_enum_value(*(enum AA *)VAL1, 1) +
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__builtin_preserve_enum_value(*(enum AA *)VAL2, 1);
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}
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unsigned invalid16(void) {
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return __builtin_preserve_enum_value(*(enum AA *)0, 1); // expected-error {{__builtin_preserve_enum_value argument 1 invalid}}
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}
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unsigned invalid17(void) {
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return __builtin_preserve_enum_value(*(enum AA *)VAL10, 1); // expected-error {{__builtin_preserve_enum_value argument 1 invalid}}
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}
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unsigned invalid18(struct s *arg) {
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return __builtin_preserve_type_info(arg->a + 2, 0); // expected-error {{__builtin_preserve_type_info argument 1 invalid}}
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}
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