93 lines
2.7 KiB
Objective-C
93 lines
2.7 KiB
Objective-C
// RUN: %clang_cc1 -analyze -analyzer-store=region -analyzer-checker=core,alpha.deadcode.IdempotentOperations -verify %s
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struct s {
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int data;
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};
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struct s global;
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void g(int);
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void f4() {
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int a;
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if (global.data == 0)
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a = 3;
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if (global.data == 0) // When the true branch is feasible 'a = 3'.
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g(a); // no-warning
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}
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// Test uninitialized value due to part of the structure being uninitialized.
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struct TestUninit { int x; int y; };
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struct TestUninit test_uninit_aux();
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void test_unit_aux2(int);
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void test_uninit_pos() {
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struct TestUninit v1 = { 0, 0 };
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struct TestUninit v2 = test_uninit_aux();
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int z;
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v1.y = z; // expected-warning{{Assigned value is garbage or undefined}}
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test_unit_aux2(v2.x + v1.y);
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}
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void test_uninit_pos_2() {
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struct TestUninit v1 = { 0, 0 };
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struct TestUninit v2;
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test_unit_aux2(v2.x + v1.y); // expected-warning{{The left operand of '+' is a garbage value}}
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}
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void test_uninit_pos_3() {
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struct TestUninit v1 = { 0, 0 };
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struct TestUninit v2;
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test_unit_aux2(v1.y + v2.x); // expected-warning{{The right operand of '+' is a garbage value}}
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}
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void test_uninit_neg() {
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struct TestUninit v1 = { 0, 0 };
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struct TestUninit v2 = test_uninit_aux();
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test_unit_aux2(v2.x + v1.y); // expected-warning{{The right operand to '+' is always 0}}
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}
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extern void test_uninit_struct_arg_aux(struct TestUninit arg);
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void test_uninit_struct_arg() {
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struct TestUninit x;
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test_uninit_struct_arg_aux(x); // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
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}
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@interface Foo
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- (void) passVal:(struct TestUninit)arg;
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@end
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void testFoo(Foo *o) {
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struct TestUninit x;
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[o passVal:x]; // expected-warning{{Passed-by-value struct argument contains uninitialized data (e.g., field: 'x')}}
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}
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// Test case from <rdar://problem/7780304>. That shows an uninitialized value
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// being used in the LHS of a compound assignment.
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void rdar_7780304() {
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typedef struct s_r7780304 { int x; } s_r7780304;
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s_r7780304 b;
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b.x |= 1; // expected-warning{{The left expression of the compound assignment is an uninitialized value. The computed value will also be garbage}}
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}
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// The flip side of PR10163 -- float arrays that are actually uninitialized
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// (The main test is in uninit-vals.m)
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void test_PR10163(float);
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void PR10163 (void) {
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float x[2];
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test_PR10163(x[1]); // expected-warning{{uninitialized value}}
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}
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struct MyStr {
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int x;
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int y;
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};
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void swap(struct MyStr *To, struct MyStr *From) {
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// This is not really a swap but close enough for our test.
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To->x = From->x;
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To->y = From->y; // no warning
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}
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int test_undefined_member_assignment_in_swap(struct MyStr *s2) {
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struct MyStr s1;
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s1.x = 5;
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swap(s2, &s1);
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return s2->y; // expected-warning{{Undefined or garbage value returned to caller}}
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}
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