test/Analysis/free.c

   1 // RUN: %clang_cc1 -analyze -analyzer-experimental-internal-checks -analyzer-check-objc-mem -analyzer-store=region -analyzer-experimental-checks -fblocks -verify %s
   2 void free(void *);
   3
   4 void t1 () {
   5   int a[] = { 1 };
   6   free(a); // expected-warning {{Argument to free() is the address of the local variable 'a', which is not memory allocated by malloc()}}
   7 }
   8
   9 void t2 () {
  10   int a = 1;
  11   free(&a); // expected-warning {{Argument to free() is the address of the local variable 'a', which is not memory allocated by malloc()}}
  12 }
  13
  14 void t3 () {
  15   static int a[] = { 1 };
  16   free(a); // expected-warning {{Argument to free() is the address of the static variable 'a', which is not memory allocated by malloc()}}
  17 }
  18
  19 void t4 (char *x) {
  20   free(x); // no-warning
  21 }
  22
  23 void t5 () {
  24   extern char *ptr();
  25   free(ptr()); // no-warning
  26 }
  27
  28 void t6 () {
  29   free((void*)1000); // expected-warning {{Argument to free() is a constant address (1000), which is not memory allocated by malloc()}}
  30 }
  31
  32 void t7 (char **x) {
  33   free(*x); // no-warning
  34 }
  35
  36 void t8 (char **x) {
  37   // ugh
  38   free((*x)+8); // no-warning
  39 }
  40
  41 void t9 () {
  42 label:
  43   free(&&label); // expected-warning {{Argument to free() is the address of the label 'label', which is not memory allocated by malloc()}}
  44 }
  45
  46 void t10 () {
  47   free((void*)&t10); // expected-warning {{Argument to free() is the address of the function 't10', which is not memory allocated by malloc()}}
  48 }
  49
  50 void t11 () {
  51   char *p = (char*)__builtin_alloca(2);
  52   free(p); // expected-warning {{Argument to free() was allocated by alloca(), not malloc()}}
  53 }
  54
  55 void t12 () {
  56   free(^{return;}); // expected-warning {{Argument to free() is a block, which is not memory allocated by malloc()}}
  57 }
  58
  59 void t13 (char a) {
  60   free(&a); // expected-warning {{Argument to free() is the address of the parameter 'a', which is not memory allocated by malloc()}}
  61 }
  62
  63 static int someGlobal[2];
  64 void t14 () {
  65   free(someGlobal); // expected-warning {{Argument to free() is the address of the global variable 'someGlobal', which is not memory allocated by malloc()}}
  66 }
  67
  68 void t15 (char **x, int offset) {
  69   // Unknown value
  70   free(x[offset]); // no-warning
  71 }