1 | // |
---|
2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
---|
3 | // |
---|
4 | // The contents of this file are covered under the licence agreement in the |
---|
5 | // file "LICENCE" distributed with Cforall. |
---|
6 | // |
---|
7 | // dtor-early-exit.c -- |
---|
8 | // |
---|
9 | // Author : Rob Schluntz |
---|
10 | // Created On : Wed Aug 17 08:26:25 2016 |
---|
11 | // Last Modified By : Peter A. Buhr |
---|
12 | // Last Modified On : Wed Aug 17 08:29:37 2016 |
---|
13 | // Update Count : 2 |
---|
14 | // |
---|
15 | |
---|
16 | #include <fstream> |
---|
17 | #include <stdlib> |
---|
18 | extern "C" { |
---|
19 | #define false ((int)0) // until stdbool.h works |
---|
20 | #define assert(cond) if (! (cond)) { sout | "Assertion failed: (" | #cond | ") at " __FILE__ | ":" | __LINE__ | endl; abort(); } |
---|
21 | } |
---|
22 | |
---|
23 | struct A { |
---|
24 | char * name; |
---|
25 | int * x; |
---|
26 | }; |
---|
27 | |
---|
28 | // don't want these called |
---|
29 | void ?{}(A & a) { assert( false ); } |
---|
30 | void ?{}(A & a, const char * name) { a.name = name; sout | "construct " | name | endl; a.x = (int*)malloc(); } |
---|
31 | void ?{}(A & a, const char * name, int * ptr) { assert( false ); } |
---|
32 | |
---|
33 | A ?=?(A & a, A b) { sout | "assign " | a.name | " " | b.name; return a; } |
---|
34 | void ?{}(A & a, A b) { sout | "copy construct " | b.name | endl; a.x = (int*)malloc(); } |
---|
35 | void ^?{}(A & a) { sout | "destruct " | a.name | endl; free(a.x); } |
---|
36 | |
---|
37 | // test returns |
---|
38 | void f(int i) { |
---|
39 | sout | "f i=" | i | endl; |
---|
40 | A x = { "x" }; // construct x |
---|
41 | { |
---|
42 | A y = { "y" }; // construct y |
---|
43 | { |
---|
44 | A z = { "z" }; // construct z |
---|
45 | { |
---|
46 | if (i == 0) return; // destruct x, y, z |
---|
47 | } |
---|
48 | if (i == 1) return; // destruct x, y, z |
---|
49 | // destruct z |
---|
50 | } |
---|
51 | if (i == 2) return; // destruct x, y |
---|
52 | // destruct y |
---|
53 | } |
---|
54 | return; // destruct x |
---|
55 | } |
---|
56 | |
---|
57 | // test loops, switch, etc. |
---|
58 | void g() { |
---|
59 | for (int i = 0; i < 10; i++) { |
---|
60 | sout | "g for i=" | i | endl; |
---|
61 | A x = { "x" }; |
---|
62 | // construct x |
---|
63 | // destruct x |
---|
64 | } |
---|
65 | sout | endl; |
---|
66 | { |
---|
67 | int i = 0; |
---|
68 | while (i < 10) { |
---|
69 | sout | "g while i=" | i | endl; |
---|
70 | A x = { "x" }; |
---|
71 | // construct x |
---|
72 | i++; |
---|
73 | // destruct x |
---|
74 | } |
---|
75 | } |
---|
76 | sout | endl; |
---|
77 | for (int i = 0; i < 10; i++) { |
---|
78 | switch(10) { |
---|
79 | case 0: |
---|
80 | case 5: |
---|
81 | case 10: { |
---|
82 | A y = { "y" }; |
---|
83 | sout | "g switch i=" | i | endl; |
---|
84 | // construct y |
---|
85 | break; // destruct y |
---|
86 | } |
---|
87 | default: { |
---|
88 | sout | "g switch i=" | i | endl; |
---|
89 | A x = { "x" }; |
---|
90 | // construct x |
---|
91 | break; // destruct x |
---|
92 | } |
---|
93 | } |
---|
94 | } |
---|
95 | sout | endl; |
---|
96 | for (int k = 0; k < 2; k++) { |
---|
97 | sout | "g for k=" | k | endl; |
---|
98 | L1: for (int i = 0; i < 10; i++) { |
---|
99 | sout | "g for i=" | i | endl; |
---|
100 | |
---|
101 | A x = { "x" }; |
---|
102 | if (i == 2) { |
---|
103 | sout | "continue L1" | endl; |
---|
104 | continue; // destruct x |
---|
105 | } else if (i == 3) { |
---|
106 | sout | "break L1" | endl; |
---|
107 | break; // destruct x |
---|
108 | } |
---|
109 | |
---|
110 | L2: for (int j = 0; j < 10; j++) { |
---|
111 | sout | "g for j=" | j | endl; |
---|
112 | A y = { "y" }; |
---|
113 | if (j == 0) { |
---|
114 | sout | "continue L2" | endl; |
---|
115 | continue; // destruct y - missing because object that needs to be destructed is not a part of this block, it's a part of the for's block |
---|
116 | } else if (j == 1) { |
---|
117 | sout | "break L2" | endl; |
---|
118 | break; // destruct y |
---|
119 | } else if (i == 1) { |
---|
120 | sout | "continue L1" | endl; |
---|
121 | continue L1; // destruct x,y - note: continue takes you to destructors for block, so only generate destructor for y |
---|
122 | } else if (k == 1) { |
---|
123 | sout | "break L1" | endl; |
---|
124 | break L1; // destruct x,y |
---|
125 | } |
---|
126 | } |
---|
127 | } |
---|
128 | } |
---|
129 | |
---|
130 | sout | endl; |
---|
131 | L3: if( 3 ) { |
---|
132 | A w = { "w" }; |
---|
133 | if( 4 ) { |
---|
134 | A v = { "v" }; |
---|
135 | sout | "break L3" | endl; |
---|
136 | break L3; |
---|
137 | } |
---|
138 | } |
---|
139 | } |
---|
140 | |
---|
141 | // test goto |
---|
142 | void h() { |
---|
143 | int i = 0; |
---|
144 | // for each goto G with target label L: |
---|
145 | // * find all constructed variables alive at G (set S_G) |
---|
146 | // * find all constructed variables alive at L (set S_L) |
---|
147 | // * if S_L-S_G is non-empty, error |
---|
148 | // * emit destructors for all variables in S_G-S_L |
---|
149 | sout | "h" | endl; |
---|
150 | { |
---|
151 | L0: ; |
---|
152 | #ifdef ERR1 |
---|
153 | goto L1; // this is an error in g++ because it skips initialization of y |
---|
154 | #endif |
---|
155 | A y = { "y" }; |
---|
156 | // S_L1 = { y } |
---|
157 | L1: sout | "L1" | endl; |
---|
158 | A x = { "x" }; |
---|
159 | // S_L2 = { y, x } |
---|
160 | L2: sout | "L2" | endl; |
---|
161 | if (i == 0) { |
---|
162 | ++i; |
---|
163 | sout | "goto L1" | endl; |
---|
164 | // S_G = { y, x } |
---|
165 | goto L1; // jump back, destruct b/c before x definition |
---|
166 | // S_L-S_G = {} => no error |
---|
167 | // S_G-S_L = { x } => destruct x |
---|
168 | } else if (i == 1) { |
---|
169 | ++i; |
---|
170 | sout | "goto L2" | endl; |
---|
171 | // S_G = { y, x } |
---|
172 | goto L2; // jump back, do not destruct |
---|
173 | // S_L-S_G = {} |
---|
174 | // S_G-S_L = {} => destruct nothing |
---|
175 | } else if (i == 2) { |
---|
176 | ++i; |
---|
177 | sout | "goto L3" | endl; |
---|
178 | // S_G = { y, x } |
---|
179 | goto L3; // jump ahead, do not destruct |
---|
180 | // S_L-S_G = {} |
---|
181 | // S_G-S_L = {} |
---|
182 | } else if (false) { |
---|
183 | ++i; |
---|
184 | A z = { "z" }; |
---|
185 | sout | "goto L3-2" | endl; |
---|
186 | // S_G = { z, y, x } |
---|
187 | goto L3; |
---|
188 | // S_L-S_G = {} |
---|
189 | // S_G-S_L = {z} => destruct z |
---|
190 | } else { |
---|
191 | ++i; |
---|
192 | sout | "goto L4" | endl; |
---|
193 | // S_G = { y, x } |
---|
194 | goto L4; // jump ahead, destruct b/c left block x was defined in |
---|
195 | // S_L-S_G = {} |
---|
196 | // S_G-S_L = { y, x } => destruct y, x |
---|
197 | } |
---|
198 | // S_L3 = { y, x } |
---|
199 | L3: sout | "L3" | endl; |
---|
200 | sout | "goto L2-2" | endl; |
---|
201 | // S_G = { y, x } |
---|
202 | goto L2; // jump back, do not destruct |
---|
203 | // S_L-S_G = {} |
---|
204 | // S_G-S_L = {} |
---|
205 | } |
---|
206 | // S_L4 = {} |
---|
207 | L4: sout | "L4" | endl; |
---|
208 | if (i == 4) { |
---|
209 | sout | "goto L0" | endl; |
---|
210 | // S_G = {} |
---|
211 | goto L0; |
---|
212 | // S_L-S_G = {} |
---|
213 | // S_G-S_L = {} |
---|
214 | } |
---|
215 | #ifdef ERR2 |
---|
216 | // S_G = {} |
---|
217 | if (i == 5) goto L2; // this is an error in g++ because it skips initialization of y, x |
---|
218 | // S_L-S_G = { y, x } => non-empty, so error |
---|
219 | #endif |
---|
220 | } |
---|
221 | |
---|
222 | // TODO: implement __label__ and uncomment these lines |
---|
223 | void computedGoto() { |
---|
224 | // __label__ bar; |
---|
225 | void *ptr; |
---|
226 | ptr = &&foo; |
---|
227 | goto *ptr; |
---|
228 | assert(false); |
---|
229 | foo: ; |
---|
230 | // void f() { |
---|
231 | // ptr = &&bar; |
---|
232 | // goto *ptr; |
---|
233 | // assert(false); |
---|
234 | // } |
---|
235 | // f(); |
---|
236 | // assert(false); |
---|
237 | // bar: ; |
---|
238 | } |
---|
239 | |
---|
240 | int main() { |
---|
241 | sepDisable(sout); |
---|
242 | for (int i = 0; i < 4; i++) { |
---|
243 | f(i); |
---|
244 | } |
---|
245 | sout | endl; |
---|
246 | g(); |
---|
247 | sout | endl; |
---|
248 | h(); |
---|
249 | |
---|
250 | computedGoto(); |
---|
251 | } |
---|
252 | |
---|
253 | // Local Variables: // |
---|
254 | // tab-width: 4 // |
---|
255 | // compile-command: "cfa dtor-early-exit" // |
---|
256 | // End: // |
---|