1 // RUN: %clang_cc1 -analyze -analyzer-store=region -analyzer-checker=core,alpha.deadcode.IdempotentOperations -verify %s 2 3 struct s { 4 int data; 5 }; 6 7 struct s global; 8 9 void g(int); 10 11 void f4() { 12 int a; 13 if (global.data == 0) 14 a = 3; 15 if (global.data == 0) // When the true branch is feasible 'a = 3'. 16 g(a); // no-warning 17 } 18 19 20 // Test uninitialized value due to part of the structure being uninitialized. 21 struct TestUninit { int x; int y; }; 22 struct TestUninit test_uninit_aux(); 23 void test_unit_aux2(int); 24 void test_uninit_pos() { 25 struct TestUninit v1 = { 0, 0 }; 26 struct TestUninit v2 = test_uninit_aux(); 27 int z; 28 v1.y = z; // expected-warning{{Assigned value is garbage or undefined}} 29 test_unit_aux2(v2.x + v1.y); 30 } 31 void test_uninit_pos_2() { 32 struct TestUninit v1 = { 0, 0 }; 33 struct TestUninit v2; 34 test_unit_aux2(v2.x + v1.y); // expected-warning{{The left operand of '+' is a garbage value}} 35 } 36 void test_uninit_pos_3() { 37 struct TestUninit v1 = { 0, 0 }; 38 struct TestUninit v2; 39 test_unit_aux2(v1.y + v2.x); // expected-warning{{The right operand of '+' is a garbage value}} 40 } 41 42 void test_uninit_neg() { 43 struct TestUninit v1 = { 0, 0 }; 44 struct TestUninit v2 = test_uninit_aux(); 45 test_unit_aux2(v2.x + v1.y); // expected-warning{{The right operand to '+' is always 0}} 46 } 47 48 extern void test_uninit_struct_arg_aux(struct TestUninit arg); 49 void test_uninit_struct_arg() { 50 struct TestUninit x; 51 test_uninit_struct_arg_aux(x); // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}} 52 } 53 54 @interface Foo 55 - (void) passVal:(struct TestUninit)arg; 56 @end 57 void testFoo(Foo *o) { 58 struct TestUninit x; 59 [o passVal:x]; // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}} 60 } 61 62 // Test case from <rdar://problem/7780304>. That shows an uninitialized value 63 // being used in the LHS of a compound assignment. 64 void rdar_7780304() { 65 typedef struct s_r7780304 { int x; } s_r7780304; 66 s_r7780304 b; 67 b.x |= 1; // expected-warning{{The left expression of the compound assignment is an uninitialized value. The computed value will also be garbage}} 68 } 69 70 71 // The flip side of PR10163 -- float arrays that are actually uninitialized 72 // (The main test is in uninit-vals.m) 73 void test_PR10163(float); 74 void PR10163 (void) { 75 float x[2]; 76 test_PR10163(x[1]); // expected-warning{{uninitialized value}} 77 } 78 79 struct MyStr { 80 int x; 81 int y; 82 }; 83 void swap(struct MyStr *To, struct MyStr *From) { 84 // This is not really a swap but close enough for our test. 85 To->x = From->x; 86 To->y = From->y; // no warning 87 } 88 int test_undefined_member_assignment_in_swap(struct MyStr *s2) { 89 struct MyStr s1; 90 s1.x = 5; 91 swap(s2, &s1); 92 return s2->y; // expected-warning{{Undefined or garbage value returned to caller}} 93 } 94
