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/* run.config*
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP1 -then -lib-entry"
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP2 -lib-entry"
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP3 -lib-entry"
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP1 -lib-entry"
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP1 -absolute-valid-range 0-1 -main main2"
STDOPT: +" -cpp-extra-args=\"-DP1 -DP5\" -machdep gcc_x86_32 -absolute-valid-range 0-1 -main main3"
STDOPT: +" -machdep gcc_x86_32 -cpp-extra-args=-DP1 -main main4"
*/
// BTS 1416 and 1874
struct s {}; // empty structs only allowed in GCC/MSVC mode
struct s2 { int i1; struct s s; int i2; };
#define S struct s s;
#define S2 struct s2 s2;
#define T struct s t[10];
// Reorder the variables so that we get an error for each one
#ifdef P1
S // direct empty struct
S2
T
#endif
#ifdef P2
S2 // empty struct inside a struct
S
T
#endif
#ifdef P3
T // array of empty struct
S2
S
#endif
void main() {
void *p = &s;
s2.s = s;
t[0] = t[1];
}
#ifdef P4 // Original example of bts 1874. Not explicitly tested, as the core functionality is checked by the tests above
struct lock_class_key {}; /* pas de struct-declaration-list */
struct dentry {
struct super_block *d_sb;
};
void task_pgrp_nr_ns(struct dentry x);
extern struct dentry a;
struct super_block {
struct lock_class_key s_writers_key[4];
} task_pgrp_nr(void) {
task_pgrp_nr_ns(a);
/* pas de return */
}
#endif
// tests that dereferencing a (invalid) pointer to an empty struct does not
// crash when -valid-absolute-range is set
struct empty {};
void main2(int n) {
struct empty * ptr_ret = (struct empty *)0x2;
if (n) *ptr_ret; // invalid access, but should not crash
}
#ifdef P5
#include <stdlib.h>
struct empty empties[100];
volatile int nondet;
void main3(int n) {
struct empty *q = malloc(0);
struct empty *r = realloc(q, 0);
struct empty *p = empties;
for (int i = 0; i < 100; i++) {
empties[i] = *r;
}
*p = empties[99];
*p = *r;
free(r);
}
#endif
struct st {
int a;
};
struct s gs, *pgs = &gs;
//@ assigns \result \from pgs;
struct s *f(int);
void g(struct s *array);
void main4() {
struct s *r;
r = f(42);
g(r);
}
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