1 // RUN: %clang_analyze_cc1 -analyzer-checker=alpha.core.FixedAddr,alpha.core.PointerArithm,alpha.core.PointerSub,debug.ExprInspection -analyzer-store=region -verify -triple x86_64-apple-darwin9 -Wno-tautological-pointer-compare -analyzer-config eagerly-assume=false %s
2 // RUN: %clang_analyze_cc1 -analyzer-checker=alpha.core.FixedAddr,alpha.core.PointerArithm,alpha.core.PointerSub,debug.ExprInspection -analyzer-store=region -verify -triple i686-apple-darwin9 -Wno-tautological-pointer-compare -analyzer-config eagerly-assume=false %s
4 void clang_analyzer_eval(int);
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'.
24 domain_port (const char *domain_b, const char *domain_e,
25 const char **domain_e_ptr)
30 const char *colon = memchr (domain_b, ':', domain_e - domain_b);
32 for (p = colon + 1; p < domain_e ; p++)
33 port = 10 * port + (*p - '0');
39 int d = &y - &x; // expected-warning{{Subtraction of two pointers that do not point to the same memory chunk may cause incorrect result}}
44 d = q-p; // no-warning
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}}
55 p = &x + 1; // expected-warning{{Pointer arithmetic on non-array variables relies on memory layout, which is dangerous}}
58 p = a + 1; // no-warning
61 // Allow arithmetic on different symbolic regions.
62 void f6(int *p, int *q) {
63 int d = q - p; // no-warning
66 void null_operand(int *a) {
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}}
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}}
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}}
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}}
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}}
99 char *a = (char*)0x1000;
100 char *b = (char*)0x1100;
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}}
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}}
113 void array_matching_types() {
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}}
124 // This takes a different code path than array_matching_types()
125 void array_different_types() {
128 char *b = (char*)&array[5];
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}}
135 struct test { int x; int y; };
136 void struct_fields() {
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}}
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}}
148 void mixed_region_types() {
151 void *a = &array, *b = &s;
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}}
158 void symbolic_region(int *p) {
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}}
166 void PR7527 (int *p) {
167 if (((int) p) & 1) // not crash
171 void use_symbols(int *lhs, int *rhs) {
172 clang_analyzer_eval(lhs < rhs); // expected-warning{{UNKNOWN}}
175 clang_analyzer_eval(lhs < rhs); // expected-warning{{FALSE}}
177 clang_analyzer_eval(lhs - rhs); // expected-warning{{UNKNOWN}}
178 if ((lhs - rhs) != 5)
180 clang_analyzer_eval((lhs - rhs) == 5); // expected-warning{{TRUE}}
183 void equal_implies_zero(int *lhs, int *rhs) {
184 clang_analyzer_eval(lhs == rhs); // expected-warning{{UNKNOWN}}
186 clang_analyzer_eval(lhs != rhs); // expected-warning{{FALSE}}
187 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{TRUE}}
190 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
191 clang_analyzer_eval(lhs != rhs); // expected-warning{{TRUE}}
192 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{FALSE}}
195 void zero_implies_equal(int *lhs, int *rhs) {
196 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{UNKNOWN}}
197 if ((rhs - lhs) == 0) {
198 clang_analyzer_eval(lhs != rhs); // expected-warning{{FALSE}}
199 clang_analyzer_eval(lhs == rhs); // expected-warning{{TRUE}}
202 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{FALSE}}
203 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
204 clang_analyzer_eval(lhs != rhs); // expected-warning{{TRUE}}
207 void comparisons_imply_size(int *lhs, int *rhs) {
208 clang_analyzer_eval(lhs <= rhs); // expected-warning{{UNKNOWN}}
211 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{FALSE}}
215 clang_analyzer_eval(lhs <= rhs); // expected-warning{{TRUE}}
216 // FIXME: In Z3ConstraintManager, ptrdiff_t is mapped to signed bitvector. However, this does not directly imply the unsigned comparison.
217 #ifdef ANALYZER_CM_Z3
218 clang_analyzer_eval((rhs - lhs) >= 0); // expected-warning{{UNKNOWN}}
220 clang_analyzer_eval((rhs - lhs) >= 0); // expected-warning{{TRUE}}
222 clang_analyzer_eval((rhs - lhs) > 0); // expected-warning{{UNKNOWN}}
225 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{TRUE}}
229 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
230 clang_analyzer_eval(lhs < rhs); // expected-warning{{TRUE}}
231 #ifdef ANALYZER_CM_Z3
232 clang_analyzer_eval((rhs - lhs) > 0); // expected-warning{{UNKNOWN}}
234 clang_analyzer_eval((rhs - lhs) > 0); // expected-warning{{TRUE}}
238 void size_implies_comparison(int *lhs, int *rhs) {
239 clang_analyzer_eval(lhs <= rhs); // expected-warning{{UNKNOWN}}
241 if ((rhs - lhs) < 0) {
242 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
246 #ifdef ANALYZER_CM_Z3
247 clang_analyzer_eval(lhs <= rhs); // expected-warning{{UNKNOWN}}
249 clang_analyzer_eval(lhs <= rhs); // expected-warning{{TRUE}}
251 clang_analyzer_eval((rhs - lhs) >= 0); // expected-warning{{TRUE}}
252 clang_analyzer_eval((rhs - lhs) > 0); // expected-warning{{UNKNOWN}}
254 if ((rhs - lhs) <= 0) {
255 clang_analyzer_eval(lhs == rhs); // expected-warning{{TRUE}}
259 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
260 #ifdef ANALYZER_CM_Z3
261 clang_analyzer_eval(lhs < rhs); // expected-warning{{UNKNOWN}}
263 clang_analyzer_eval(lhs < rhs); // expected-warning{{TRUE}}
265 clang_analyzer_eval((rhs - lhs) > 0); // expected-warning{{TRUE}}
268 void zero_implies_reversed_equal(int *lhs, int *rhs) {
269 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{UNKNOWN}}
270 if ((rhs - lhs) == 0) {
271 clang_analyzer_eval(rhs != lhs); // expected-warning{{FALSE}}
272 clang_analyzer_eval(rhs == lhs); // expected-warning{{TRUE}}
275 clang_analyzer_eval((rhs - lhs) == 0); // expected-warning{{FALSE}}
276 clang_analyzer_eval(rhs == lhs); // expected-warning{{FALSE}}
277 clang_analyzer_eval(rhs != lhs); // expected-warning{{TRUE}}
280 void canonical_equal(int *lhs, int *rhs) {
281 clang_analyzer_eval(lhs == rhs); // expected-warning{{UNKNOWN}}
283 clang_analyzer_eval(rhs == lhs); // expected-warning{{TRUE}}
286 clang_analyzer_eval(lhs == rhs); // expected-warning{{FALSE}}
287 clang_analyzer_eval(rhs == lhs); // expected-warning{{FALSE}}
290 void compare_element_region_and_base(int *p) {
292 clang_analyzer_eval(p == q); // expected-warning{{FALSE}}
299 void symbolicFieldRegion(struct Point *points, int i, int j) {
300 clang_analyzer_eval(&points[i].x == &points[j].x);// expected-warning{{UNKNOWN}}
301 clang_analyzer_eval(&points[i].x == &points[i].y);// expected-warning{{FALSE}}
302 clang_analyzer_eval(&points[i].x < &points[i].y);// expected-warning{{TRUE}}
305 void negativeIndex(char *str) {
307 clang_analyzer_eval(*(str + 1) == 'a'); // expected-warning{{TRUE}}
308 clang_analyzer_eval(*(str - 1) == 'a'); // expected-warning{{UNKNOWN}}
310 char *ptr1 = str - 1;
311 clang_analyzer_eval(*ptr1 == 'a'); // expected-warning{{UNKNOWN}}
315 clang_analyzer_eval(*ptr2 == 'a'); // expected-warning{{UNKNOWN}}
319 clang_analyzer_eval(*ptr3 == 'a'); // expected-warning{{UNKNOWN}}
322 void test_no_crash_on_pointer_to_label() {
328 typedef __attribute__((__ext_vector_type__(2))) float simd_float2;
329 float test_nowarning_on_vector_deref() {
330 simd_float2 x = {0, 1};
331 return x[1]; // no-warning