testsuite: Add more allocation size tests for conjured svalues [PR110014]

This patch adds the reproducers reported in PR 110014 as test cases. The
false positives in those cases are already fixed with PR 109577.

2023-06-09  Tim Lange  <mail@tim-lange.me>

	PR analyzer/110014

gcc/testsuite/ChangeLog:

	* gcc.dg/analyzer/realloc-pr110014.c: New tests.

(cherry picked from commit r14-1685-g39adc5eebd61fd276f3f1ef9d7228756a35bd0cb)

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/analyzer/realloc-pr110014.c b/gcc/testsuite/gcc.dg/analyzer/realloc-pr110014.c
new file mode 100644
index 0000000..d76b878
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/realloc-pr110014.c
@@ -0,0 +1,25 @@
+void *realloc (void *, unsigned long)
+  __attribute__((__nothrow__, __leaf__))
+  __attribute__((__warn_unused_result__)) __attribute__((__alloc_size__ (2)));
+
+long *
+slurp (long *buffer, unsigned long file_size)
+{
+  unsigned long cc;
+  if (!__builtin_add_overflow (file_size - file_size % sizeof (long),
+			       2 * sizeof (long), &cc))
+    buffer = realloc (buffer, cc);
+  return buffer;
+}
+
+long *
+slurp1 (long *buffer, unsigned long file_size)
+{
+  return realloc (buffer, file_size - file_size % sizeof (long));
+}
+
+long *
+slurp2 (long *buffer, unsigned long file_size)
+{
+  return realloc (buffer, (file_size / sizeof (long)) * sizeof (long));
+}