clang/test/Analysis/stack-addr-ps.c

   1 // RUN: %clang_analyze_cc1 -analyzer-checker=core -fblocks -verify %s
   2
   3 int* f1(void) {
   4   int x = 0;
   5   return &x; // expected-warning{{Address of stack memory associated with local variable 'x' returned}} expected-warning{{address of stack memory associated with local variable 'x' returned}}
   6 }
   7
   8 int* f2(int y) {
   9   return &y;  // expected-warning{{Address of stack memory associated with local variable 'y' returned}} expected-warning{{address of stack memory associated with parameter 'y' returned}}
  10 }
  11
  12 int* f3(int x, int *y) {
  13   int w = 0;
  14
  15   if (x)
  16     y = &w;
  17
  18   return y; // expected-warning{{Address of stack memory associated with local variable 'w' returned to caller}}
  19 }
  20
  21 void* compound_literal(int x, int y) {
  22   if (x)
  23     return &(unsigned short){((unsigned short)0x22EF)}; // expected-warning{{Address of stack memory}}
  24
  25   int* array[] = {};
  26   struct s { int z; double y; int w; };
  27
  28   if (y)
  29     return &((struct s){ 2, 0.4, 5 * 8 }); // expected-warning{{Address of stack memory}}
  30
  31
  32   void* p = &((struct s){ 42, 0.4, x ? 42 : 0 });
  33   return p; // expected-warning{{Address of stack memory}}
  34 }
  35
  36 void* alloca_test(void) {
  37   void* p = __builtin_alloca(10);
  38   return p; // expected-warning{{Address of stack memory}}
  39 }
  40
  41 int array_test(int x[2]) {
  42   return x[0]; // no-warning
  43 }
  44
  45 struct baz {
  46   int x;
  47   int y[2];
  48 };
  49
  50 int struct_test(struct baz byVal, int flag) {
  51   if (flag)
  52     return byVal.x; // no-warning
  53   else {
  54     return byVal.y[0]; // no-warning
  55   }
  56 }
  57
  58 typedef int (^ComparatorBlock)(int a, int b);
  59 ComparatorBlock test_return_block(void) {
  60   // This block is a global since it has no captures.
  61   ComparatorBlock b = ^int(int a, int b){ return a > b; };
  62   return b; // no-warning
  63 }
  64
  65 ComparatorBlock test_return_block_with_capture(int x) {
  66   // This block is stack allocated because it has captures.
  67   ComparatorBlock b = ^int(int a, int b){ return a > b + x; };
  68   return b; // expected-warning{{Address of stack-allocated block}}
  69 }
  70
  71 ComparatorBlock test_return_block_neg_aux(void);
  72 ComparatorBlock test_return_block_neg(void) {
  73   ComparatorBlock b = test_return_block_neg_aux();
  74   return b; // no-warning
  75 }
  76
  77 // <rdar://problem/7523821>
  78 int *rdar_7523821_f2(void) {
  79   int a[3];
  80   return a; // expected-warning 2 {{ddress of stack memory associated with local variable 'a' returned}}
  81 };
  82
  83 // Handle blocks that have no captures or are otherwise declared 'static'.
  84 // <rdar://problem/10348049>
  85 typedef int (^RDar10348049)(int value);
  86 RDar10348049 test_rdar10348049(void) {
  87   static RDar10348049 b = ^int(int x) {
  88     return x + 2;
  89   };
  90   return b; // no-warning
  91 }
  92
  93 void testRegister(register const char *reg) {
  94     if (reg) (void)reg[0];
  95 }
  96 void callTestRegister(void) {
  97     char buf[20];
  98     testRegister(buf); // no-warning
  99 }