1 files changed, 279 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/Wfree-nonheap-object-2.c b/gcc/testsuite/gcc.dg/Wfree-nonheap-object-2.c
new file mode 100644
index 0000000..2b00d77
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wfree-nonheap-object-2.c
@@ -0,0 +1,279 @@
+/* PR ????? - No warning on attempts to access free object
+   Verify that attempting to reallocate unallocated objects referenced
+   either directly or through pointers is diagnosed.
+   { dg-do compile }
+   { dg-options "-O2 -Wall -Wfree-nonheap-object" }  */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern void free (void*);
+extern void* alloca (size_t);
+extern void* realloc (void*, size_t);
+
+void sink (void*, ...);
+
+extern void* eparr[];
+extern char *eptr;
+
+extern size_t n;
+
+
+void nowarn_realloc (void *p, size_t n)
+{
+  char *q = realloc (p, n);
+  sink (q);
+
+  q = realloc (0, n);
+  sink (q);
+
+  q = realloc (q, n * 2);
+  sink (q);
+}
+
+/* Verify that calling realloc on a pointer to an unknown object minus
+   some nonzero offset isn't diagnosed, but a pointer plus a positive
+   offset is (a positive offset cannot point at the beginning).  */
+
+void test_realloc_offset (char *p1, char *p2, char *p3, size_t n, int i)
+{
+  char *q;
+  q = realloc (p1 - 1, n);
+  sink (q);
+
+  q = realloc (p2 + 1, n);    // { dg-warning "'realloc' called on pointer 'p2' with nonzero offset 1" }
+  sink (q);
+
+  q = realloc (p3 + i, n);
+  sink (q);
+}
+
+void warn_realloc_extern_arr (void)
+{
+  extern char ecarr[];        // { gg-message "declared here" }
+  char *p = ecarr;
+  char *q = realloc (p, n);   // { dg-warning "'realloc' called on unallocated object 'ecarr'" }
+  sink (q);
+}
+
+void warn_realloc_extern_arr_offset (int i)
+{
+  extern char ecarr[];
+  char *p = ecarr + i;
+  char *q = realloc (p, n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}
+
+
+void warn_realloc_string (int i)
+{
+  char *p, *q;
+  {
+    p = "123";
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+  {
+    p = "234" + 1;
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+  {
+    p = "123" + i;
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+}
+
+
+void warn_realloc_alloca (int n, int i)
+{
+  char *p, *q;
+  {
+    p = alloca (n);
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+  {
+    p = (char*)alloca (n + 1);
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+  {
+    p = (char*)alloca (n + 2) + i;
+    sink (p);
+    q = realloc (p, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+}
+
+
+void warn_realloc_local_arr (int i)
+{
+  char *q;
+  {
+    char a[4];
+    sink (a);
+    q = realloc (a, n);       // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char b[5];
+    sink (b);
+    q = realloc (b + 1, n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char c[6];
+    sink (c);
+    q = realloc (&c[2], n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char d[7];
+    sink (d);
+    q = realloc (&d[i], n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+}
+
+void warn_realloc_vla (int n1, int n2, int i)
+{
+  char *q;
+  {
+    char vla[n1];
+    sink (vla);
+    q = realloc (vla, n2);    // { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char vlb[n1 + 1];
+    sink (vlb);
+    q = realloc (vlb + 1, n2);// { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char vlc[n1 + 2];
+    sink (vlc);
+    q = realloc (&vlc[2], n2);// { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+
+  {
+    char vld[7];
+    sink (vld);
+    q = realloc (&vld[i], n2);// { dg-warning "\\\[-Wfree-nonheap-object" }
+    sink (q);
+  }
+}
+
+void nowarn_realloc_extern_ptrarr (void)
+{
+  char *q = realloc (*eparr, n);
+  sink (q);
+}
+
+void nowarn_realloc_extern_ptrarr_offset (int i)
+{
+  char *p = eparr[i];
+  char *q = realloc (p, n);
+  sink (q);
+}
+
+
+void warn_realloc_extern_ptrarr (void)
+{
+  char *q = realloc (eparr, n);  // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}
+
+void warn_realloc_extern_ptrarr_offset (int i)
+{
+  void *p = eparr + i;
+  void *q = realloc (p, n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}
+
+
+void nowarn_realloc_extern_ptr (void)
+{
+  char *q = realloc (eptr, n);
+  sink (q);
+}
+
+void nowarn_realloc_extern_ptr_offset (int i)
+{
+  char *p = eptr + i;
+  char *q = realloc (p, n);
+  sink (q);
+}
+
+
+void warn_realloc_extern_ptr_pos_offset (int i)
+{
+  if (i <= 0)
+    i = 1;
+
+  char *p = eptr + i;
+  char *q = realloc (p, n);   // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}
+
+
+void nowarn_realloc_parm_offset (char *p, int i)
+{
+  char *q = p + i;
+  q = realloc (q, n);
+  sink (q);
+}
+
+void nowarn_realloc_parm_neg_offset (char *p, int i)
+{
+  if (i >= 0)
+    i = -1;
+
+  char *q = p + i;
+  q = realloc (q, n);
+  sink (q);
+}
+
+void warn_realloc_parm_pos_offset (char *p, int i)
+{
+  if (i <= 0)
+    i = 1;
+
+  char *q = p + i;
+  q = realloc (q, n);         // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}
+
+void nowarn_realloc_deref_parm_pos_offset (void **p, int i)
+{
+  if (i <= 0)
+    i = 1;
+
+  // The offset is from p, not *p.
+  void *q = *(p + i);
+  q = realloc (q, n);
+  sink (q);
+}
+
+void warn_realloc_deref_parm_pos_offset (void **p, int i)
+{
+  if (i <= 0)
+    i = 1;
+
+  // Unlike in the function above the offset is from *p.
+  void *q = *p + i;
+  q = realloc (q, n);         // { dg-warning "\\\[-Wfree-nonheap-object" }
+  sink (q);
+}