Viewing file:  isolate-5.c (1.54 KB) -rw-r--r--
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/* { dg-do compile } */
/* { dg-options "-O2 -fdelete-null-pointer-checks -fdump-tree-isolate-paths -fdump-tree-optimized -Wnull-dereference" } */
/* { dg-skip-if "" keeps_null_pointer_checks } */
struct demangle_component
{
int type;
int zzz;
};
struct d_info
{
struct demangle_component *comps;
int next_comp;
int num_comps;
};
void foo (int);
void bar (int);
static struct demangle_component *
d_make_empty (struct d_info *di)
{
struct demangle_component *p;
if (di->next_comp >= di->num_comps)
return ((void *)0);
p = &di->comps[di->next_comp];
return p;
}
struct demangle_component *
d_type (struct d_info *di)
{
struct demangle_component *ret;
ret = d_make_empty (di);
foo (ret->type); /* { dg-warning "null pointer dereference" } */
bar (ret->zzz); /* { dg-warning "null pointer dereference" } */
return ret;
}
/* We're testing two aspects of isolation here. First that isolation
occurs, second that if we have two null dereferences in a block that
that we delete everything from the first dereferece to the end of the
block, regardless of which comes first in the immediate use iterator.
We leave the 0->type in the IL, so expect to see ->type twice. */
/* { dg-final { scan-tree-dump-times "__builtin_trap" 1 "isolate-paths"} } */
/* { dg-final { scan-tree-dump-times "->type" 2 "isolate-paths"} } */
/* { dg-final { scan-tree-dump-times "->type" 1 "optimized"} } */
/* { dg-final { scan-tree-dump-times "\\.type" 1 "optimized"} } */
/* { dg-final { scan-tree-dump-times "->zzz" 1 "isolate-paths"} } */
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