builtin-functions.cpp source code [clang_source_code/test/Analysis/builtin-functions.cpp]

1	// RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -analyzer-checker=core,debug.ExprInspection %s -std=c++11 -verify
2
3	void clang_analyzer_eval(bool);
4	void clang_analyzer_warnIfReached();
5
6	void testAddressof(int x) {
7	clang_analyzer_eval(&x == __builtin_addressof(x)); // expected-warning{{TRUE}}
8	}
9
10	void testSize() {
11	struct {
12	int x;
13	int y;
14	char z;
15	} object;
16	clang_analyzer_eval(__builtin_object_size(&object.y, 0) == sizeof(object) - sizeof(int)); // expected-warning{{TRUE}}
17
18	// Clang can't actually evaluate these builtin "calls", but importantly they don't actually evaluate the argument expression either.
19	int i = 0;
20	char buf[10];
21	clang_analyzer_eval(__builtin_object_size(&buf[i++], 0) == sizeof(buf)); // expected-warning{{FALSE}}
22	clang_analyzer_eval(__builtin_object_size(&buf[++i], 0) == sizeof(buf) - 1); // expected-warning{{FALSE}}
23
24	clang_analyzer_eval(i == 0); // expected-warning{{TRUE}}
25	}
26
27	void test_assume_aligned_1(char *p) {
28	char *q;
29
30	q = (char*) __builtin_assume_aligned(p, 16);
31	clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
32	}
33
34	void test_assume_aligned_2(char *p) {
35	char *q;
36
37	q = (char*) __builtin_assume_aligned(p, 16, 8);
38	clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
39	}
40
41	void test_assume_aligned_3(char *p) {
42	void *q;
43
44	q = __builtin_assume_aligned(p, 16, 8);
45	clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
46	}
47
48	void test_assume_aligned_4(char *p) {
49	char *q;
50
51	q = (char*) __builtin_assume_aligned(p + 1, 16);
52	clang_analyzer_eval(p == q); // expected-warning{{FALSE}}
53	}
54
55	void f(int i) {
56	__builtin_assume(i < 10);
57	clang_analyzer_eval(i < 15); // expected-warning {{TRUE}}
58	}
59
60	void g(int i) {
61	if (i > 5) {
62	__builtin_assume(i < 5);
63	clang_analyzer_warnIfReached(); // Assumtion contradicts constraints.
64	// We give up the analysis on this path.
65	}
66	}
67
68	void test_constant_p() {
69	int i = 1;
70	const int j = 2;
71	constexpr int k = 3;
72	clang_analyzer_eval(__builtin_constant_p(42) == 1); // expected-warning {{TRUE}}
73	clang_analyzer_eval(__builtin_constant_p(i) == 0); // expected-warning {{UNKNOWN}}
74	clang_analyzer_eval(__builtin_constant_p(j) == 1); // expected-warning {{TRUE}}
75	clang_analyzer_eval(__builtin_constant_p(k) == 1); // expected-warning {{TRUE}}
76	clang_analyzer_eval(__builtin_constant_p(i + 42) == 0); // expected-warning {{UNKNOWN}}
77	clang_analyzer_eval(__builtin_constant_p(j + 42) == 1); // expected-warning {{TRUE}}
78	clang_analyzer_eval(__builtin_constant_p(k + 42) == 1); // expected-warning {{TRUE}}
79	clang_analyzer_eval(__builtin_constant_p(" ") == 1); // expected-warning {{TRUE}}
80	clang_analyzer_eval(__builtin_constant_p(test_constant_p) == 0); // expected-warning {{UNKNOWN}}
81	clang_analyzer_eval(__builtin_constant_p(k - 3) == 0); // expected-warning {{FALSE}}
82	clang_analyzer_eval(__builtin_constant_p(k - 3) == 1); // expected-warning {{TRUE}}
83	}
84

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