1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// RUN: %clang_cc1 -fsyntax-only -verify -fblocks -std=gnu99 %s -Wno-unreachable-code
int test1(int x) {
goto L; // expected-error{{cannot jump from this goto statement to its label}}
int a[x]; // expected-note {{jump bypasses initialization of variable length array}}
int b[x]; // expected-note {{jump bypasses initialization of variable length array}}
L:
return sizeof a;
}
int test2(int x) {
goto L; // expected-error{{cannot jump from this goto statement to its label}}
typedef int a[x]; // expected-note {{jump bypasses initialization of VLA typedef}}
L:
return sizeof(a);
}
void test3clean(int*);
int test3() {
goto L; // expected-error{{cannot jump from this goto statement to its label}}
int a __attribute((cleanup(test3clean))); // expected-note {{jump bypasses initialization of variable with __attribute__((cleanup))}}
L:
return a;
}
int test4(int x) {
goto L; // expected-error{{cannot jump from this goto statement to its label}}
int a[x]; // expected-note {{jump bypasses initialization of variable length array}}
test4(x);
L:
return sizeof a;
}
int test5(int x) {
int a[x];
test5(x);
goto L; // Ok.
L:
goto L; // Ok.
return sizeof a;
}
int test6() {
// just plain invalid.
goto x; // expected-error {{use of undeclared label 'x'}}
}
void test7(int x) {
switch (x) {
case 1: ;
int a[x]; // expected-note {{jump bypasses initialization of variable length array}}
case 2: // expected-error {{cannot jump from switch statement to this case label}}
a[1] = 2;
break;
}
}
int test8(int x) {
// For statement.
goto L2; // expected-error {{cannot jump from this goto statement to its label}}
for (int arr[x]; // expected-note {{jump bypasses initialization of variable length array}}
; ++x)
L2:;
// Statement expressions.
goto L3; // expected-error {{cannot jump from this goto statement to its label}}
int Y = ({ int a[x]; // expected-note {{jump bypasses initialization of variable length array}}
L3: 4; });
goto L4; // expected-error {{cannot jump from this goto statement to its label}}
{
int A[x], // expected-note {{jump bypasses initialization of variable length array}}
B[x]; // expected-note {{jump bypasses initialization of variable length array}}
L4: ;
}
{
L5: ;// ok
int A[x], B = ({ if (x)
goto L5;
else
goto L6;
4; });
L6:; // ok.
if (x) goto L6; // ok
}
{
L7: ;// ok
int A[x], B = ({ if (x)
goto L7;
else
goto L8; // expected-error {{cannot jump from this goto statement to its label}}
4; }),
C[x]; // expected-note {{jump bypasses initialization of variable length array}}
L8:; // bad
}
{
L9: ;// ok
int A[({ if (x)
goto L9;
else
// FIXME:
goto L10; // fixme-error {{cannot jump from this goto statement to its label}}
4; })];
L10:; // bad
}
{
// FIXME: Crashes goto checker.
//goto L11;// ok
//int A[({ L11: 4; })];
}
{
goto L12;
int y = 4; // fixme-warn: skips initializer.
L12:
;
}
// Statement expressions 2.
goto L1; // expected-error {{cannot jump from this goto statement to its label}}
return x == ({
int a[x]; // expected-note {{jump bypasses initialization of variable length array}}
L1:
42; });
}
void test9(int n, void *P) {
int Y;
int Z = 4;
goto *P; // expected-error {{cannot jump from this indirect goto statement to one of its possible targets}}
L2: ;
int a[n]; // expected-note {{jump bypasses initialization of variable length array}}
L3: // expected-note {{possible target of indirect goto}}
L4:
goto *P;
goto L3; // ok
goto L4; // ok
void *Ptrs[] = {
&&L2,
&&L3
};
}
void test10(int n, void *P) {
goto L0; // expected-error {{cannot jump from this goto statement to its label}}
typedef int A[n]; // expected-note {{jump bypasses initialization of VLA typedef}}
L0:
goto L1; // expected-error {{cannot jump from this goto statement to its label}}
A b, c[10]; // expected-note 2 {{jump bypasses initialization of variable length array}}
L1:
goto L2; // expected-error {{cannot jump from this goto statement to its label}}
A d[n]; // expected-note {{jump bypasses initialization of variable length array}}
L2:
return;
}
void test11(int n) {
void *P = ^{
switch (n) {
case 1:;
case 2:
case 3:;
int Arr[n]; // expected-note {{jump bypasses initialization of variable length array}}
case 4: // expected-error {{cannot jump from switch statement to this case label}}
return;
}
};
}
// TODO: When and if gotos are allowed in blocks, this should work.
void test12(int n) {
void *P = ^{
goto L1;
L1:
goto L2;
L2:
goto L3; // expected-error {{cannot jump from this goto statement to its label}}
int Arr[n]; // expected-note {{jump bypasses initialization of variable length array}}
L3:
goto L4;
L4: return;
};
}
void test13(int n, void *p) {
int vla[n];
goto *p;
a0: ;
static void *ps[] = { &&a0 };
}
int test14(int n) {
static void *ps[] = { &&a0, &&a1 };
if (n < 0)
goto *&&a0;
if (n > 0) {
int vla[n];
a1:
vla[n-1] = 0;
}
a0:
return 0;
}
// PR8473: IR gen can't deal with indirect gotos past VLA
// initialization, so that really needs to be a hard error.
void test15(int n, void *pc) {
static const void *addrs[] = { &&L1, &&L2 };
goto *pc; // expected-error {{cannot jump from this indirect goto statement to one of its possible targets}}
L1:
{
char vla[n]; // expected-note {{jump bypasses initialization}}
L2: // expected-note {{possible target}}
vla[0] = 'a';
}
}
// rdar://9024687
int test16(int [sizeof &&z]); // expected-error {{use of address-of-label extension outside of a function body}}
|
