This repository has been archived by the owner on Oct 12, 2022. It is now read-only.
/
construction.d
311 lines (281 loc) · 7.08 KB
/
construction.d
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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
/**
This module contains compiler support for constructing dynamic arrays
Copyright: Copyright Digital Mars 2000 - 2019.
License: Distributed under the
$(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
(See accompanying file LICENSE)
Source: $(DRUNTIMESRC core/internal/_array/_construction.d)
*/
module core.internal.array.construction;
/**
* Does array initialization (not assignment) from another array of the same element type.
* Params:
* to = what array to initialize
* from = what data the array should be initialized with
* Returns:
* The constructed `to`
* Bugs:
* This function template was ported from a much older runtime hook that bypassed safety,
* purity, and throwabilty checks. To prevent breaking existing code, this function template
* is temporarily declared `@trusted` until the implementation can be brought up to modern D expectations.
*/
Tarr _d_arrayctor(Tarr : T[], T)(return scope Tarr to, scope Tarr from) @trusted
{
pragma(inline, false);
import core.internal.traits : hasElaborateCopyConstructor, Unqual;
import core.lifetime : copyEmplace;
import core.stdc.string : memcpy;
import core.stdc.stdint : uintptr_t;
debug(PRINTF) import core.stdc.stdio : printf;
debug(PRINTF) printf("_d_arrayctor(to = %p,%d, from = %p,%d) size = %d\n", from.ptr, from.length, to.ptr, to.length, T.tsize);
void[] vFrom = (cast(void*)from.ptr)[0..from.length];
void[] vTo = (cast(void*)to.ptr)[0..to.length];
// Force `enforceRawArraysConformable` to be `pure`
void enforceRawArraysConformable(const char[] action, const size_t elementSize,
const void[] a1, const void[] a2) @trusted
{
import core.internal.util.array : enforceRawArraysConformableNogc;
alias Type = void function(const char[] action, const size_t elementSize,
const void[] a1, const void[] a2, in bool allowOverlap = false) @nogc pure nothrow;
(cast(Type)&enforceRawArraysConformableNogc)(action, elementSize, a1, a2, false);
}
enforceRawArraysConformable("initialization", T.sizeof, vFrom, vTo);
static if (hasElaborateCopyConstructor!T)
{
// Use uint instead of size_t as a temporary workaround until this bug is fixed:
// https://issues.dlang.org/show_bug.cgi?id=22372
uint i;
try
{
for (i = 0; i < to.length; i++)
copyEmplace(from[i], to[i]);
}
catch (Exception o)
{
/* Destroy, in reverse order, what we've constructed so far
*/
while (i--)
{
auto elem = cast(Unqual!T*)&to[i];
destroy(*elem);
}
throw o;
}
}
else
{
// blit all elements at once
memcpy(cast(void*) to.ptr, from.ptr, to.length * T.sizeof);
}
return to;
}
// postblit
@safe unittest
{
int counter;
struct S
{
int val;
this(this) { counter++; }
}
S[4] arr1;
S[4] arr2 = [S(0), S(1), S(2), S(3)];
_d_arrayctor(arr1[], arr2[]);
assert(counter == 4);
assert(arr1 == arr2);
}
// copy constructor
@safe unittest
{
int counter;
struct S
{
int val;
this(int val) { this.val = val; }
this(const scope ref S rhs)
{
val = rhs.val;
counter++;
}
}
S[4] arr1;
S[4] arr2 = [S(0), S(1), S(2), S(3)];
_d_arrayctor(arr1[], arr2[]);
assert(counter == 4);
assert(arr1 == arr2);
}
@safe nothrow unittest
{
// Test that throwing works
int counter;
bool didThrow;
struct Throw
{
int val;
this(this)
{
counter++;
if (counter == 2)
throw new Exception("");
}
}
try
{
Throw[4] a;
Throw[4] b = [Throw(1), Throw(2), Throw(3), Throw(4)];
_d_arrayctor(a[], b[]);
}
catch (Exception)
{
didThrow = true;
}
assert(didThrow);
assert(counter == 2);
// Test that `nothrow` works
didThrow = false;
counter = 0;
struct NoThrow
{
int val;
this(this)
{
counter++;
}
}
try
{
NoThrow[4] a;
NoThrow[4] b = [NoThrow(1), NoThrow(2), NoThrow(3), NoThrow(4)];
_d_arrayctor(a[], b[]);
}
catch (Exception)
{
didThrow = false;
}
assert(!didThrow);
assert(counter == 4);
}
/**
* Do construction of an array.
* ti[count] p = value;
* Params:
* p = what array to initialize
* value = what data to construct the array with
* Bugs:
* This function template was ported from a much older runtime hook that bypassed safety,
* purity, and throwabilty checks. To prevent breaking existing code, this function template
* is temporarily declared `@trusted` until the implementation can be brought up to modern D expectations.
*/
void _d_arraysetctor(Tarr : T[], T)(scope Tarr p, scope ref T value) @trusted
{
pragma(inline, false);
import core.internal.traits : Unqual;
import core.lifetime : copyEmplace;
size_t i;
try
{
for (i = 0; i < p.length; i++)
copyEmplace(value, p[i]);
}
catch (Exception o)
{
// Destroy, in reverse order, what we've constructed so far
while (i--)
{
auto elem = cast(Unqual!T*)&p[i];
destroy(*elem);
}
throw o;
}
}
// postblit
@safe unittest
{
int counter;
struct S
{
int val;
this(this)
{
counter++;
}
}
S[4] arr;
S s = S(1234);
_d_arraysetctor(arr[], s);
assert(counter == arr.length);
assert(arr == [S(1234), S(1234), S(1234), S(1234)]);
}
// copy constructor
@safe unittest
{
int counter;
struct S
{
int val;
this(int val) { this.val = val; }
this(const scope ref S rhs)
{
val = rhs.val;
counter++;
}
}
S[4] arr;
S s = S(1234);
_d_arraysetctor(arr[], s);
assert(counter == arr.length);
assert(arr == [S(1234), S(1234), S(1234), S(1234)]);
}
@safe nothrow unittest
{
// Test that throwing works
int counter;
bool didThrow;
struct Throw
{
int val;
this(this)
{
counter++;
if (counter == 2)
throw new Exception("Oh no.");
}
}
try
{
Throw[4] a;
Throw[4] b = [Throw(1), Throw(2), Throw(3), Throw(4)];
_d_arrayctor(a[], b[]);
}
catch (Exception)
{
didThrow = true;
}
assert(didThrow);
assert(counter == 2);
// Test that `nothrow` works
didThrow = false;
counter = 0;
struct NoThrow
{
int val;
this(this)
{
counter++;
}
}
try
{
NoThrow[4] a;
NoThrow b = NoThrow(1);
_d_arraysetctor(a[], b);
foreach (ref e; a)
assert(e == NoThrow(1));
}
catch (Exception)
{
didThrow = false;
}
assert(!didThrow);
assert(counter == 4);
}