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// RUN: %clang_cc1 -analyze -analyzer-store=region -analyzer-checker=core,experimental.deadcode.IdempotentOperations -verify %s
struct s {
int data;
};
struct s global;
void g(int);
void f4() {
int a;
if (global.data == 0)
a = 3;
if (global.data == 0) // When the true branch is feasible 'a = 3'.
g(a); // no-warning
}
// Test uninitialized value due to part of the structure being uninitialized.
struct TestUninit { int x; int y; };
struct TestUninit test_uninit_aux();
void test_unit_aux2(int);
void test_uninit_pos() {
struct TestUninit v1 = { 0, 0 };
struct TestUninit v2 = test_uninit_aux();
int z;
v1.y = z; // expected-warning{{Assigned value is garbage or undefined}}
test_unit_aux2(v2.x + v1.y);
}
void test_uninit_pos_2() {
struct TestUninit v1 = { 0, 0 };
struct TestUninit v2;
test_unit_aux2(v2.x + v1.y); // expected-warning{{The left operand of '+' is a garbage value}}
}
void test_uninit_pos_3() {
struct TestUninit v1 = { 0, 0 };
struct TestUninit v2;
test_unit_aux2(v1.y + v2.x); // expected-warning{{The right operand of '+' is a garbage value}}
}
void test_uninit_neg() {
struct TestUninit v1 = { 0, 0 };
struct TestUninit v2 = test_uninit_aux();
test_unit_aux2(v2.x + v1.y); // expected-warning{{The right operand to '+' is always 0}}
}
extern void test_uninit_struct_arg_aux(struct TestUninit arg);
void test_uninit_struct_arg() {
struct TestUninit x;
test_uninit_struct_arg_aux(x); // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
}
@interface Foo
- (void) passVal:(struct TestUninit)arg;
@end
void testFoo(Foo *o) {
struct TestUninit x;
[o passVal:x]; // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
}
// Test case from <rdar://problem/7780304>. That shows an uninitialized value
// being used in the LHS of a compound assignment.
void rdar_7780304() {
typedef struct s_r7780304 { int x; } s_r7780304;
s_r7780304 b;
b.x |= 1; // expected-warning{{The left expression of the compound assignment is an uninitialized value. The computed value will also be garbage}}
}
// The flip side of PR10163 -- float arrays that are actually uninitialized
// (The main test is in uninit-vals.m)
void test_PR10163(float);
void PR10163 (void) {
float x[2];
test_PR10163(x[1]); // expected-warning{{uninitialized value}}
}
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