283e0a81ef
Clang doesn't have the same behavior as GCC does with union flexible array members. (Technically, union FAMs are probably not acceptable in C99 and are an extension of GCC and Clang.) Both Clang and GCC treat *all* arrays at the end of a structure as FAMs. GCC does the same with unions. Clang does it for some arrays in unions (incomplete, '0', and '1'), but not for all. Instead of having this half-supported feature, sync Clang's behavior with GCC's. Reviewed By: kees Differential Revision: https://reviews.llvm.org/D135727
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
// RUN: %clang_cc1 -verify=expected -Warray-bounds-pointer-arithmetic %s
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// RUN: %clang_cc1 -verify=expected -Warray-bounds-pointer-arithmetic %s -fstrict-flex-arrays=0
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// RUN: %clang_cc1 -verify=expected,strict -Warray-bounds-pointer-arithmetic %s -fstrict-flex-arrays=2
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// Test case from PR10615
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struct ext2_super_block{
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unsigned char s_uuid[8]; // expected-note {{declared here}}
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int ignored; // Prevents "s_uuid" from being treated as a flexible array
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// member.
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};
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void* ext2_statfs (struct ext2_super_block *es,int a) {
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return (void *)es->s_uuid + sizeof(int); // no-warning
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}
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void* broken (struct ext2_super_block *es,int a) {
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return (void *)es->s_uuid + 9; // expected-warning {{the pointer incremented by 9 refers past the end of the array (that has type 'unsigned char[8]')}}
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}
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// Test case reduced from PR11594
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struct S {
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int n;
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};
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void pr11594(struct S *s) {
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int a[10];
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int *p = a - s->n;
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}
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// Test case reduced from <rdar://problem/11387038>. This resulted in
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// an assertion failure because of the typedef instead of an explicit
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// constant array type.
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struct RDar11387038 {};
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typedef struct RDar11387038 RDar11387038Array[1];
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struct RDar11387038_Table {
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RDar11387038Array z; // strict-note {{array 'z' declared here}}
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};
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typedef struct RDar11387038_Table *TPtr;
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typedef TPtr *TabHandle;
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struct RDar11387038_B {
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TabHandle x;
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};
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typedef struct RDar11387038_B RDar11387038_B;
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void radar11387038(void) {
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RDar11387038_B *pRDar11387038_B;
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struct RDar11387038 *y = &(*pRDar11387038_B->x)->z[4]; // strict-warning {{array index 4 is past the end of the array (that has type 'struct RDar11387038[1]')}}
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}
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void pr51682(void) {
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int arr[1];
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switch (0) {
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case 0:
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break;
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case 1:
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asm goto("" ::"r"(arr[42] >> 1)::failed);
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break;
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}
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failed:;
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}
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