[commit: ghc] master: rts: Add an initial Coverity model (4539400)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/4539400a72ded7fa69149b28cfa9c84464f4739d/ghc

>---------------------------------------------------------------

commit 4539400a72ded7fa69149b28cfa9c84464f4739d
Author: Austin Seipp <austin at well-typed.com>
Date:   Tue Apr 29 08:48:57 2014 -0500

    rts: Add an initial Coverity model
    
    Signed-off-by: Austin Seipp <austin at well-typed.com>


>---------------------------------------------------------------

4539400a72ded7fa69149b28cfa9c84464f4739d
 rts/Coverity.c |  112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)

diff --git a/rts/Coverity.c b/rts/Coverity.c
new file mode 100644
index 0000000..d0a3708
--- /dev/null
+++ b/rts/Coverity.c
@@ -0,0 +1,112 @@
+/* Coverity Scan model
+ * This is a modeling file for Coverity Scan. Modeling helps to avoid false
+ * positives.
+ *
+ * - A model file can't import any header files.  Some built-in primitives are
+ *   available but not wchar_t, NULL etc.
+ * - Modeling doesn't need full structs and typedefs. Rudimentary structs
+ *   and similar types are sufficient.
+ * - An uninitialized local variable signifies that the variable could be
+ *   any value.
+ *
+ * The model file must be uploaded by an admin in the analysis settings of
+ * http://scan.coverity.com/projects/1919
+ */
+
+#define NULL ((void*)0)
+#define assert(x) if (!(x)) __coverity_panic__();
+
+/* type decls */
+typedef struct {} va_list;
+
+/* glibc functions */
+void *malloc (size_t);
+void *calloc (size_t, size_t);
+void *realloc (void *, size_t);
+void free (void *);
+
+/* rts allocation functions */
+
+void* stgMallocBytes(int n, char *msg)
+{
+  void *mem;
+  __coverity_negative_sink__((size_t)n);
+  mem = malloc((size_t)n);
+  assert(mem != NULL);
+  return mem;
+}
+
+void* stgReallocBytes(void *p, int n, char *msg)
+{
+  void *mem;
+  __coverity_negative_sink__((size_t)n);
+
+  /* man 3 realloc: if p == NULL, then realloc is equivalent to malloc() */
+  if (p == NULL) {
+    mem = malloc((size_t)n);
+    assert(mem != NULL);
+    return mem;
+  }
+
+  /* man 3 realloc: if n == 0, then realloc is equivalent to free() */
+  if (n == 0) {
+    free(p);
+    return NULL;
+  } else {
+    mem = realloc(p, (size_t)n);
+    assert(mem != NULL);
+    return mem;
+  }
+}
+
+void* stgCallocBytes(int n, int m, char *msg)
+{
+  void *mem;
+  __coverity_negative_sink__((size_t)n);
+  __coverity_negative_sink__((size_t)m);
+  mem = calloc(n, m);
+  assert(mem != NULL);
+  return mem;
+}
+
+void stgFree(void* p)
+{
+  free(p);
+}
+
+/* Kill paths */
+
+void stg_exit(int n)
+{
+  __coverity_panic__();
+}
+
+void shutdownThread(void)
+{
+  __coverity_panic__();
+}
+
+void shutdownHaskellAndExit(int exitCode, int fastExit)
+{
+  __coverity_panic__();
+}
+
+void shutdownHaskellAndSignal(int sig, int fastExit)
+{
+  __coverity_panic__();
+}
+
+void _assertFail(const char *filename, unsigned int linenum)
+{
+  __coverity_panic__();
+}
+
+void barf(const char *s, ...)
+{
+  __coverity_panic__();
+}
+
+void vbarf(const char *s, va_list ap)
+{
+  __coverity_panic__();
+}