1 files changed, 271 insertions, 0 deletions
diff --git a/clang/test/Analysis/malloc-annotations.c b/clang/test/Analysis/malloc-annotations.c
new file mode 100644
index 0000000..a0c1452
--- /dev/null
+++ b/clang/test/Analysis/malloc-annotations.c
@@ -0,0 +1,271 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=core,experimental.deadcode.UnreachableCode,experimental.core.CastSize,experimental.unix.MallocWithAnnotations -analyzer-store=region -verify %s
+typedef __typeof(sizeof(int)) size_t;
+void *malloc(size_t);
+void free(void *);
+void *realloc(void *ptr, size_t size);
+void *calloc(size_t nmemb, size_t size);
+void __attribute((ownership_returns(malloc))) *my_malloc(size_t);
+void __attribute((ownership_takes(malloc, 1))) my_free(void *);
+void my_freeBoth(void *, void *)
+       __attribute((ownership_holds(malloc, 1, 2)));
+void __attribute((ownership_returns(malloc, 1))) *my_malloc2(size_t);
+void __attribute((ownership_holds(malloc, 1))) my_hold(void *);
+
+// Duplicate attributes are silly, but not an error.
+// Duplicate attribute has no extra effect.
+// If two are of different kinds, that is an error and reported as such.
+void __attribute((ownership_holds(malloc, 1)))
+__attribute((ownership_holds(malloc, 1)))
+__attribute((ownership_holds(malloc, 3))) my_hold2(void *, void *, void *);
+void *my_malloc3(size_t);
+void *myglobalpointer;
+struct stuff {
+  void *somefield;
+};
+struct stuff myglobalstuff;
+
+void f1() {
+  int *p = malloc(12);
+  return; // expected-warning{{Memory is never released; potential leak}}
+}
+
+void f2() {
+  int *p = malloc(12);
+  free(p);
+  free(p); // expected-warning{{Attempt to free released memory}}
+}
+
+void f2_realloc_0() {
+  int *p = malloc(12);
+  realloc(p,0);
+  realloc(p,0); // expected-warning{{Attempt to free released memory}}
+}
+
+void f2_realloc_1() {
+  int *p = malloc(12);
+  int *q = realloc(p,0); // no-warning
+}
+
+// ownership attributes tests
+void naf1() {
+  int *p = my_malloc3(12);
+  return; // no-warning
+}
+
+void n2af1() {
+  int *p = my_malloc2(12);
+  return; // expected-warning{{Memory is never released; potential leak}}
+}
+
+void af1() {
+  int *p = my_malloc(12);
+  return; // expected-warning{{Memory is never released; potential leak}}
+}
+
+void af1_b() {
+  int *p = my_malloc(12); // expected-warning{{Memory is never released; potential leak}}
+}
+
+void af1_c() {
+  myglobalpointer = my_malloc(12); // no-warning
+}
+
+// TODO: We will be able to handle this after we add support for tracking allocations stored in struct fields.
+void af1_d() {
+  struct stuff mystuff;
+  mystuff.somefield = my_malloc(12); // false negative
+}
+
+// Test that we can pass out allocated memory via pointer-to-pointer.
+void af1_e(void **pp) {
+  *pp = my_malloc(42); // no-warning
+}
+
+void af1_f(struct stuff *somestuff) {
+  somestuff->somefield = my_malloc(12); // no-warning
+}
+
+// Allocating memory for a field via multiple indirections to our arguments is OK.
+void af1_g(struct stuff **pps) {
+  *pps = my_malloc(sizeof(struct stuff)); // no-warning
+  (*pps)->somefield = my_malloc(42); // no-warning
+}
+
+void af2() {
+  int *p = my_malloc(12);
+  my_free(p);
+  free(p); // expected-warning{{Attempt to free released memory}}
+}
+
+void af2b() {
+  int *p = my_malloc(12);
+  free(p);
+  my_free(p); // expected-warning{{Attempt to free released memory}}
+}
+
+void af2c() {
+  int *p = my_malloc(12);
+  free(p);
+  my_hold(p); // expected-warning{{Attempt to free released memory}}
+}
+
+void af2d() {
+  int *p = my_malloc(12);
+  free(p);
+  my_hold2(0, 0, p); // expected-warning{{Attempt to free released memory}}
+}
+
+// No leak if malloc returns null.
+void af2e() {
+  int *p = my_malloc(12);
+  if (!p)
+    return; // no-warning
+  free(p); // no-warning
+}
+
+// This case would inflict a double-free elsewhere.
+// However, this case is considered an analyzer bug since it causes false-positives.
+void af3() {
+  int *p = my_malloc(12);
+  my_hold(p);
+  free(p); // no-warning
+}
+
+int * af4() {
+  int *p = my_malloc(12);
+  my_free(p);
+  return p; // expected-warning{{Use of memory after it is freed}}
+}
+
+// This case is (possibly) ok, be conservative
+int * af5() {
+  int *p = my_malloc(12);
+  my_hold(p);
+  return p; // no-warning
+}
+
+
+
+// This case tests that storing malloc'ed memory to a static variable which is
+// then returned is not leaked.  In the absence of known contracts for functions
+// or inter-procedural analysis, this is a conservative answer.
+int *f3() {
+  static int *p = 0;
+  p = malloc(12);
+  return p; // no-warning
+}
+
+// This case tests that storing malloc'ed memory to a static global variable
+// which is then returned is not leaked.  In the absence of known contracts for
+// functions or inter-procedural analysis, this is a conservative answer.
+static int *p_f4 = 0;
+int *f4() {
+  p_f4 = malloc(12);
+  return p_f4; // no-warning
+}
+
+int *f5() {
+  int *q = malloc(12);
+  q = realloc(q, 20);
+  return q; // no-warning
+}
+
+void f6() {
+  int *p = malloc(12);
+  if (!p)
+    return; // no-warning
+  else
+    free(p);
+}
+
+void f6_realloc() {
+  int *p = malloc(12);
+  if (!p)
+    return; // no-warning
+  else
+    realloc(p,0);
+}
+
+
+char *doit2();
+void pr6069() {
+  char *buf = doit2();
+  free(buf);
+}
+
+void pr6293() {
+  free(0);
+}
+
+void f7() {
+  char *x = (char*) malloc(4);
+  free(x);
+  x[0] = 'a'; // expected-warning{{Use of memory after it is freed}}
+}
+
+void f7_realloc() {
+  char *x = (char*) malloc(4);
+  realloc(x,0);
+  x[0] = 'a'; // expected-warning{{Use of memory after it is freed}}
+}
+
+void PR6123() {
+  int *x = malloc(11); // expected-warning{{Cast a region whose size is not a multiple of the destination type size.}}
+}
+
+void PR7217() {
+  int *buf = malloc(2); // expected-warning{{Cast a region whose size is not a multiple of the destination type size.}}
+  buf[1] = 'c'; // not crash
+}
+
+void mallocCastToVoid() {
+  void *p = malloc(2);
+  const void *cp = p; // not crash
+  free(p);
+}
+
+void mallocCastToFP() {
+  void *p = malloc(2);
+  void (*fp)() = p; // not crash
+  free(p);
+}
+
+// This tests that malloc() buffers are undefined by default
+char mallocGarbage () {
+  char *buf = malloc(2);
+  char result = buf[1]; // expected-warning{{undefined}}
+  free(buf);
+  return result;
+}
+
+// This tests that calloc() buffers need to be freed
+void callocNoFree () {
+  char *buf = calloc(2,2);
+  return; // expected-warning{{never released}}
+}
+
+// These test that calloc() buffers are zeroed by default
+char callocZeroesGood () {
+  char *buf = calloc(2,2);
+  char result = buf[3]; // no-warning
+  if (buf[1] == 0) {
+    free(buf);
+  }
+  return result; // no-warning
+}
+
+char callocZeroesBad () {
+  char *buf = calloc(2,2);
+  char result = buf[3]; // no-warning
+  if (buf[1] != 0) {
+    free(buf); // expected-warning{{never executed}}
+  }
+  return result; // expected-warning{{never released}}
+}
+
+void testMultipleFreeAnnotations() {
+  int *p = malloc(12);
+  int *q = malloc(12);
+  my_freeBoth(p, q);
+}
+