1 // RUN: %clang_cc1 -analyze -analyzer-checker=alpha.core.FixedAddr,alpha.core.PointerArithm,alpha.core.PointerSub,debug.ExprInspection -analyzer-store=region -verify -triple x86_64-apple-darwin9 %s
2 // RUN: %clang_cc1 -analyze -analyzer-checker=alpha.core.FixedAddr,alpha.core.PointerArithm,alpha.core.PointerSub,debug.ExprInspection -analyzer-store=region -verify -triple i686-apple-darwin9 %s
3
4 void clang_analyzer_eval(int);
5
f1()6 void f1() {
7 int a[10];
8 int *p = a;
9 ++p;
10 }
11
12 char* foo();
13
f2()14 void f2() {
15 char *p = foo();
16 ++p;
17 }
18
19 // This test case checks if we get the right rvalue type of a TypedViewRegion.
20 // The ElementRegion's type depends on the array region's rvalue type. If it was
21 // a pointer type, we would get a loc::SymbolVal for '*p'.
22 void* memchr();
23 static int
domain_port(const char * domain_b,const char * domain_e,const char ** domain_e_ptr)24 domain_port (const char *domain_b, const char *domain_e,
25 const char **domain_e_ptr)
26 {
27 int port = 0;
28
29 const char *p;
30 const char *colon = memchr (domain_b, ':', domain_e - domain_b);
31
32 for (p = colon + 1; p < domain_e ; p++)
33 port = 10 * port + (*p - '0');
34 return port;
35 }
36
f3()37 void f3() {
38 int x, y;
39 int d = &y - &x; // expected-warning{{Subtraction of two pointers that do not point to the same memory chunk may cause incorrect result}}
40
41 int a[10];
42 int *p = &a[2];
43 int *q = &a[8];
44 d = q-p; // no-warning
45 }
46
f4()47 void f4() {
48 int *p;
49 p = (int*) 0x10000; // expected-warning{{Using a fixed address is not portable because that address will probably not be valid in all environments or platforms}}
50 }
51
f5()52 void f5() {
53 int x, y;
54 int *p;
55 p = &x + 1; // expected-warning{{Pointer arithmetic done on non-array variables means reliance on memory layout, which is dangerous}}
56
57 int a[10];
58 p = a + 1; // no-warning
59 }
60
61 // Allow arithmetic on different symbolic regions.
f6(int * p,int * q)62 void f6(int *p, int *q) {
63 int d = q - p; // no-warning
64 }
65
null_operand(int * a)66 void null_operand(int *a) {
67 start:
68 // LHS is a label, RHS is NULL
69 clang_analyzer_eval(&&start != 0); // expected-warning{{TRUE}}
70 clang_analyzer_eval(&&start >= 0); // expected-warning{{TRUE}}
71 clang_analyzer_eval(&&start > 0); // expected-warning{{TRUE}}
72 clang_analyzer_eval((&&start - 0) != 0); // expected-warning{{TRUE}}
73
74 // LHS is a non-symbolic value, RHS is NULL
75 clang_analyzer_eval(&a != 0); // expected-warning{{TRUE}}
76 clang_analyzer_eval(&a >= 0); // expected-warning{{TRUE}}
77 clang_analyzer_eval(&a > 0); // expected-warning{{TRUE}}
78 clang_analyzer_eval((&a - 0) != 0); // expected-warning{{TRUE}} expected-warning{{Pointer arithmetic done on non-array variables}}
79
80 // LHS is NULL, RHS is non-symbolic
81 // The same code is used for labels and non-symbolic values.
82 clang_analyzer_eval(0 != &a); // expected-warning{{TRUE}}
83 clang_analyzer_eval(0 <= &a); // expected-warning{{TRUE}}
84 clang_analyzer_eval(0 < &a); // expected-warning{{TRUE}}
85
86 // LHS is a symbolic value, RHS is NULL
87 clang_analyzer_eval(a != 0); // expected-warning{{UNKNOWN}}
88 clang_analyzer_eval(a >= 0); // expected-warning{{TRUE}}
89 clang_analyzer_eval(a <= 0); // expected-warning{{UNKNOWN}}
90 clang_analyzer_eval((a - 0) != 0); // expected-warning{{UNKNOWN}}
91
92 // LHS is NULL, RHS is a symbolic value
93 clang_analyzer_eval(0 != a); // expected-warning{{UNKNOWN}}
94 clang_analyzer_eval(0 <= a); // expected-warning{{TRUE}}
95 clang_analyzer_eval(0 < a); // expected-warning{{UNKNOWN}}
96 }
97
const_locs()98 void const_locs() {
99 char *a = (char*)0x1000;
100 char *b = (char*)0x1100;
101 start:
102 clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
103 clang_analyzer_eval(a < b); // expected-warning{{TRUE}}
104 clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
105 clang_analyzer_eval((b-a) == 0x100); // expected-warning{{TRUE}}
106
107 clang_analyzer_eval(&&start == a); // expected-warning{{UNKNOWN}}
108 clang_analyzer_eval(a == &&start); // expected-warning{{UNKNOWN}}
109 clang_analyzer_eval(&a == (char**)a); // expected-warning{{UNKNOWN}}
110 clang_analyzer_eval((char**)a == &a); // expected-warning{{UNKNOWN}}
111 }
112
array_matching_types()113 void array_matching_types() {
114 int array[10];
115 int *a = &array[2];
116 int *b = &array[5];
117
118 clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
119 clang_analyzer_eval(a < b); // expected-warning{{TRUE}}
120 clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
121 clang_analyzer_eval((b-a) != 0); // expected-warning{{TRUE}}
122 }
123
124 // This takes a different code path than array_matching_types()
array_different_types()125 void array_different_types() {
126 int array[10];
127 int *a = &array[2];
128 char *b = (char*)&array[5];
129
130 clang_analyzer_eval(a != b); // expected-warning{{TRUE}} expected-warning{{comparison of distinct pointer types}}
131 clang_analyzer_eval(a < b); // expected-warning{{TRUE}} expected-warning{{comparison of distinct pointer types}}
132 clang_analyzer_eval(a <= b); // expected-warning{{TRUE}} expected-warning{{comparison of distinct pointer types}}
133 }
134
135 struct test { int x; int y; };
struct_fields()136 void struct_fields() {
137 struct test a, b;
138
139 clang_analyzer_eval(&a.x != &a.y); // expected-warning{{TRUE}}
140 clang_analyzer_eval(&a.x < &a.y); // expected-warning{{TRUE}}
141 clang_analyzer_eval(&a.x <= &a.y); // expected-warning{{TRUE}}
142
143 clang_analyzer_eval(&a.x != &b.x); // expected-warning{{TRUE}}
144 clang_analyzer_eval(&a.x > &b.x); // expected-warning{{UNKNOWN}}
145 clang_analyzer_eval(&a.x >= &b.x); // expected-warning{{UNKNOWN}}
146 }
147
mixed_region_types()148 void mixed_region_types() {
149 struct test s;
150 int array[2];
151 void *a = &array, *b = &s;
152
153 clang_analyzer_eval(&a != &b); // expected-warning{{TRUE}}
154 clang_analyzer_eval(&a > &b); // expected-warning{{UNKNOWN}}
155 clang_analyzer_eval(&a >= &b); // expected-warning{{UNKNOWN}}
156 }
157
symbolic_region(int * p)158 void symbolic_region(int *p) {
159 int a;
160
161 clang_analyzer_eval(&a != p); // expected-warning{{TRUE}}
162 clang_analyzer_eval(&a > p); // expected-warning{{UNKNOWN}}
163 clang_analyzer_eval(&a >= p); // expected-warning{{UNKNOWN}}
164 }
165
PR7527(int * p)166 void PR7527 (int *p) {
167 if (((int) p) & 1) // not crash
168 return;
169 }
170