1 // RUN: %clang_cc1 -analyze -analyzer-checker=core -analyzer-store=region -fblocks -verify %s
2 
3 int* f1() {
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 local variable '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() {
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   ComparatorBlock b = ^int(int a, int b){ return a > b; };
61   return b; // expected-warning{{Address of stack-allocated block declared on line 60 returned to caller}}
62 }
63 
64 ComparatorBlock test_return_block_neg_aux(void);
65 ComparatorBlock test_return_block_neg(void) {
66   ComparatorBlock b = test_return_block_neg_aux();
67   return b; // no-warning
68 }
69 
70 // <rdar://problem/7523821>
71 int *rdar_7523821_f2() {
72   int a[3];
73   return a; // expected-warning 2 {{ddress of stack memory associated with local variable 'a' returned}}
74 };
75 
76 
77