clang/test/Analysis/stackaddrleak.c

   1 // RUN: %clang_analyze_cc1 -analyzer-checker=core -verify -std=c99 -Dbool=_Bool -Wno-bool-conversion %s
   2 // RUN: %clang_analyze_cc1 -analyzer-checker=core -verify -x c++ -Wno-bool-conversion %s
   3
   4 typedef __INTPTR_TYPE__ intptr_t;
   5 char const *p;
   6
   7 void f0(void) {
   8   char const str[] = "This will change";
   9   p = str;
  10 }  // expected-warning{{Address of stack memory associated with local variable 'str' is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
  11
  12 void f1(void) {
  13   char const str[] = "This will change";
  14   p = str;
  15   p = 0; // no-warning
  16 }
  17
  18 void f2(void) {
  19   p = (const char *) __builtin_alloca(12);
  20 } // expected-warning{{Address of stack memory allocated by call to alloca() on line 19 is still referred to by the global variable 'p' upon returning to the caller.  This will be a dangling reference}}
  21
  22 // PR 7383 - previously the stack address checker would crash on this example
  23 //  because it would attempt to do a direct load from 'pr7383_list'.
  24 static int pr7383(__const char *__)
  25 {
  26   return 0;
  27 }
  28 extern __const char *__const pr7383_list[];
  29
  30 // Test that we catch multiple returns via globals when analyzing a function.
  31 void test_multi_return(void) {
  32   static int *a, *b;
  33   int x;
  34   a = &x;
  35   b = &x;
  36 } // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the static variable 'a' upon returning}} expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the static variable 'b' upon returning}}
  37
  38 intptr_t returnAsNonLoc(void) {
  39   int x;
  40   return (intptr_t)&x; // expected-warning{{Address of stack memory associated with local variable 'x' returned to caller}} expected-warning{{address of stack memory associated with local variable 'x' returned}}
  41 }
  42
  43 bool returnAsBool(void) {
  44   int x;
  45   return &x; // no-warning
  46 }
  47
  48 void assignAsNonLoc(void) {
  49   extern intptr_t ip;
  50   int x;
  51   ip = (intptr_t)&x;
  52 } // expected-warning{{Address of stack memory associated with local variable 'x' is still referred to by the global variable 'ip' upon returning}}
  53
  54 void assignAsBool(void) {
  55   extern bool b;
  56   int x;
  57   b = &x;
  58 } // no-warning