Viewing file:  Wstringop-overflow-47.c (2.31 KB) -rw-r--r--
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/* Verify that storing a bigger vector into smaller space is diagnosed.
{ dg-do compile }
{ dg-options "-O2" } */
typedef __INT16_TYPE__ int16_t;
typedef __attribute__ ((__vector_size__ (32))) char C32;
typedef __attribute__ ((__vector_size__ (64))) int16_t I16_64;
void sink (void*);
void nowarn_c32 (char c)
{
extern char nowarn_a32[32];
void *p = nowarn_a32;
*(C32*)p = (C32){ c };
sink (p);
char a32[32];
p = a32;
*(C32*)p = (C32){ c };
sink (p);
}
/* The tests below failed as a result of the hack for PR 96963. However,
with -Wall, the invalid stores were diagnosed by -Warray-bounds which
runs before vectorization and so doesn't need the hack. Now that
-Warray-bounds has changed to use compute_objsize() the tests pass. */
void warn_c32 (char c)
{
extern char warn_a32[32]; // { dg-message "at offset (32|1) into destination object 'warn_a32' of size 32" "pr97027" }
void *p = warn_a32 + 1;
*(C32*)p = (C32){ c }; // { dg-warning "writing (1 byte|32 bytes) into a region of size (0|31)" "pr97027" }
/* Verify a local variable too. */
char a32[32];
p = a32 + 1;
*(C32*)p = (C32){ c }; // { dg-warning "writing (1 byte|32 bytes) into a region of size (0|31)" "pr97027" }
sink (p);
}
void nowarn_i16_64 (int16_t i)
{
extern char nowarn_a64[64];
void *p = nowarn_a64;
I16_64 *q = (I16_64*)p;
*q = (I16_64){ i };
char a64[64];
q = (I16_64*)a64;
*q = (I16_64){ i };
sink (q);
}
void warn_i16_64 (int16_t i)
{
/* The IL below that's visible to the warning changes from one target to
another. On some like aarch64 it's a single vector store, on others
like x86_64 it's a series of BIT_FIELD_REFs. The overflow by
the former is detected but the latter is not yet. */
extern char warn_a64[64]; // { dg-message "at offset (1|128) into destination object 'warn_a64' of size (63|64)" "pr97027 note" { xfail { ! aarch64-*-* } } }
void *p = warn_a64 + 1;
I16_64 *q = (I16_64*)p;
*q = (I16_64){ i }; // { dg-warning "writing (1 byte|64 bytes) into a region of size (0|63)" "pr97027" { xfail { ! aarch64-*-* } } }
char a64[64];
p = a64 + 1;
q = (I16_64*)p;
*q = (I16_64){ i }; // { dg-warning "writing (1 byte|64 bytes) into a region of size (0|63)" "pr97027" { xfail { ! aarch64-*-* } } }
sink (p);
}
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