Viewing file:  realloc-4.c (3.1 KB) -rw-r--r--
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#include "analyzer-decls.h"
typedef __SIZE_TYPE__ size_t;
#define NULL ((void *)0)
extern void *calloc (size_t __nmemb, size_t __size)
__attribute__ ((__nothrow__ , __leaf__))
__attribute__ ((__malloc__))
__attribute__ ((__alloc_size__ (1, 2))) ;
extern void *malloc (size_t __size)
__attribute__ ((__nothrow__ , __leaf__))
__attribute__ ((__malloc__))
__attribute__ ((__alloc_size__ (1)));
extern void *realloc (void *__ptr, size_t __size)
__attribute__ ((__nothrow__ , __leaf__))
__attribute__ ((__warn_unused_result__))
__attribute__ ((__alloc_size__ (2)));
extern void free (void *__ptr)
__attribute__ ((__nothrow__ , __leaf__));
/* realloc where we don't know the original size of the region. */
char *test_8 (char *p, size_t sz)
{
char *q;
__analyzer_dump_capacity (p); /* { dg-warning "capacity: 'UNKNOWN\\(\[^\n\r\]*\\)'" } */
p[0] = 'a';
p[1] = 'b';
p[2] = 'c';
__analyzer_eval (p[0] == 'a'); /* { dg-warning "TRUE" } */
__analyzer_eval (p[1] == 'b'); /* { dg-warning "TRUE" } */
__analyzer_eval (p[2] == 'c'); /* { dg-warning "TRUE" } */
q = realloc (p, 6);
/* We should have 3 nodes, corresponding to "failure",
"success without moving", and "success with moving". */
__analyzer_dump_exploded_nodes (0); /* { dg-warning "3 processed enodes" } */
if (q)
{
q[3] = 'd';
q[4] = 'e';
q[5] = 'f';
if (q == p)
{
/* "realloc" success, growing the buffer in-place. */
__analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
__analyzer_dump_capacity (q); /* { dg-warning "capacity: '\\(\[^\n\r\]*\\)6'" } */
__analyzer_eval (q[0] == 'a'); /* { dg-warning "TRUE" } */
__analyzer_eval (q[1] == 'b'); /* { dg-warning "TRUE" } */
__analyzer_eval (q[2] == 'c'); /* { dg-warning "TRUE" } */
}
else
{
/* "realloc" success, moving the buffer (and thus freeing "p"). */
__analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
__analyzer_dump_capacity (q); /* { dg-warning "capacity: '\\(\[^\n\r\]*\\)6'" } */
/* We don't know how much of the buffer is copied. */
__analyzer_eval (q[0] == 'a'); /* { dg-warning "UNKNOWN" } */
__analyzer_eval (q[1] == 'b'); /* { dg-warning "UNKNOWN" } */
__analyzer_eval (q[2] == 'c'); /* { dg-warning "UNKNOWN" } */
__analyzer_eval (p[0] == 'a'); /* { dg-warning "UNKNOWN" "unknown" } */
/* { dg-warning "use after 'free' of 'p'" "use after free" { target *-*-* } .-1 } */
}
__analyzer_eval (q[3] == 'd'); /* { dg-warning "TRUE" } */
__analyzer_eval (q[4] == 'e'); /* { dg-warning "TRUE" } */
__analyzer_eval (q[5] == 'f'); /* { dg-warning "TRUE" } */
}
else
{
/* "realloc" failure. p should be unchanged. */
__analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
__analyzer_dump_capacity (q); /* { dg-warning "capacity: 'UNKNOWN\\(\[^\n\r\]*\\)'" } */
__analyzer_eval (p[0] == 'a'); /* { dg-warning "TRUE" } */
__analyzer_eval (p[1] == 'b'); /* { dg-warning "TRUE" } */
__analyzer_eval (p[2] == 'c'); /* { dg-warning "TRUE" } */
return p;
}
return q;
}
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