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comparison dmd/EnumDeclaration.d @ 0:10317f0c89a5

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Initial commit
author korDen
date Sat, 24 Oct 2009 08:42:06 +0400
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children 427f8aa74d28 1628b221808d
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-1:000000000000 0:10317f0c89a5
1 module dmd.EnumDeclaration;
2
3 import dmd.ScopeDsymbol;
4 import dmd.AddExp;
5 import dmd.Type;
6 import dmd.CmpExp;
7 import dmd.IntegerExp;
8 import dmd.EqualExp;
9 import dmd.TOK;
10 import dmd.Id;
11 import dmd.TY;
12 import dmd.DsymbolTable;
13 import dmd.STC;
14 import dmd.Expression;
15 import dmd.Identifier;
16 import dmd.Dsymbol;
17 import dmd.Scope;
18 import dmd.OutBuffer;
19 import dmd.HdrGenState;
20 import dmd.Global;
21 import dmd.Loc;
22 import dmd.TypeEnum;
23 import dmd.EnumMember;
24 import dmd.DYNCAST;
25 import dmd.WANT;
26 import dmd.Id;
27 import dmd.Lexer;
28
29 import dmd.backend.SC;
30 import dmd.backend.FL;
31 import dmd.backend.Util;
32 import dmd.backend.Symbol;
33 import dmd.backend.Classsym;
34 import dmd.backend.SFL;
35 import dmd.backend.LIST;
36 import dmd.codegen.Util;
37
38 import std.stdio : writef;
39
40 class EnumDeclaration : ScopeDsymbol
41 { /* enum ident : memtype { ... }
42 */
43 Type type; // the TypeEnum
44 Type memtype; // type of the members
45
46 version (DMDV1) {
47 ulong maxval;
48 ulong minval;
49 ulong defaultval; // default initializer
50 } else {
51 Expression maxval;
52 Expression minval;
53 Expression defaultval; // default initializer
54 }
55 bool isdeprecated;
56
57 this(Loc loc, Identifier id, Type memtype)
58 {
59 super(id);
60 this.loc = loc;
61 type = new TypeEnum(this);
62 this.memtype = memtype;
63 }
64
65 Dsymbol syntaxCopy(Dsymbol s)
66 {
67 assert(false);
68 }
69
70 void semantic(Scope sc)
71 {
72 Type t;
73 Scope sce;
74
75 //writef("EnumDeclaration.semantic(sd = %p, '%s') %s\n", sc.scopesym, sc.scopesym.toChars(), toChars());
76 //writef("EnumDeclaration.semantic() %s\n", toChars());
77 if (!members) // enum ident;
78 return;
79
80 if (!memtype && !isAnonymous())
81 {
82 // Set memtype if we can to reduce fwd reference errors
83 memtype = Type.tint32; // case 1) enum ident { ... }
84 }
85
86 if (symtab) // if already done
87 {
88 if (!scope_)
89 return; // semantic() already completed
90 }
91 else
92 symtab = new DsymbolTable();
93
94 Scope scx = null;
95 if (scope_)
96 { sc = scope_;
97 scx = scope_; // save so we don't make redundant copies
98 scope_ = null;
99 }
100
101 if (sc.stc & STC.STCdeprecated)
102 isdeprecated = true;
103
104 parent = sc.parent;
105
106 /* The separate, and distinct, cases are:
107 * 1. enum { ... }
108 * 2. enum : memtype { ... }
109 * 3. enum ident { ... }
110 * 4. enum ident : memtype { ... }
111 */
112
113 if (memtype)
114 {
115 memtype = memtype.semantic(loc, sc);
116
117 /* Check to see if memtype is forward referenced
118 */
119 if (memtype.ty == TY.Tenum)
120 { EnumDeclaration sym = cast(EnumDeclaration)memtype.toDsymbol(sc);
121 if (!sym.memtype || !sym.members || !sym.symtab || sym.scope_)
122 {
123 // memtype is forward referenced, so try again later
124 scope_ = scx ? scx : new Scope(sc);
125 scope_.setNoFree();
126 scope_.module_.addDeferredSemantic(this);
127 writef("\tdeferring %s\n", toChars());
128 return;
129 }
130 }
131 static if (false) {
132 // Decided to abandon this restriction for D 2.0
133 if (!memtype.isintegral())
134 { error("base type must be of integral type, not %s", memtype.toChars());
135 memtype = Type.tint32;
136 }
137 }
138 }
139
140 type = type.semantic(loc, sc);
141 if (isAnonymous())
142 sce = sc;
143 else
144 { sce = sc.push(this);
145 sce.parent = this;
146 }
147 if (members.dim == 0)
148 error("enum %s must have at least one member", toChars());
149 int first = 1;
150 Expression elast = null;
151 for (int i = 0; i < members.dim; i++)
152 {
153 EnumMember em = (cast(Dsymbol)members.data[i]).isEnumMember();
154 Expression e;
155
156 if (!em)
157 /* The e.semantic(sce) can insert other symbols, such as
158 * template instances and function literals.
159 */
160 continue;
161
162 //printf(" Enum member '%s'\n",em.toChars());
163 if (em.type)
164 em.type = em.type.semantic(em.loc, sce);
165 e = em.value;
166 if (e)
167 {
168 assert(e.dyncast() == DYNCAST.DYNCAST_EXPRESSION);
169 e = e.semantic(sce);
170 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
171 if (memtype)
172 {
173 e = e.implicitCastTo(sce, memtype);
174 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
175 if (!isAnonymous())
176 e = e.castTo(sce, type);
177 t = memtype;
178 }
179 else if (em.type)
180 {
181 e = e.implicitCastTo(sce, em.type);
182 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
183 assert(isAnonymous());
184 t = e.type;
185 }
186 else
187 t = e.type;
188 }
189 else if (first)
190 {
191 if (memtype)
192 t = memtype;
193 else if (em.type)
194 t = em.type;
195 else
196 t = Type.tint32;
197 e = new IntegerExp(em.loc, 0, Type.tint32);
198 e = e.implicitCastTo(sce, t);
199 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
200 if (!isAnonymous())
201 e = e.castTo(sce, type);
202 }
203 else
204 {
205 // Set value to (elast + 1).
206 // But first check that (elast != t.max)
207 assert(elast);
208 e = new EqualExp(TOK.TOKequal, em.loc, elast, t.getProperty(Loc(0), Id.max));
209 e = e.semantic(sce);
210 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
211 if (e.toInteger())
212 error("overflow of enum value %s", elast.toChars());
213
214 // Now set e to (elast + 1)
215 e = new AddExp(em.loc, elast, new IntegerExp(em.loc, 1, Type.tint32));
216 e = e.semantic(sce);
217 e = e.castTo(sce, elast.type);
218 e = e.optimize(WANT.WANTvalue | WANT.WANTinterpret);
219 }
220 elast = e;
221 em.value = e;
222
223 // Add to symbol table only after evaluating 'value'
224 if (isAnonymous())
225 {
226 /* Anonymous enum members get added to enclosing scope.
227 */
228 for (Scope scxx = sce; scxx; scxx = scxx.enclosing)
229 {
230 if (scxx.scopesym)
231 {
232 if (!scxx.scopesym.symtab)
233 scxx.scopesym.symtab = new DsymbolTable();
234 em.addMember(sce, scxx.scopesym, 1);
235 break;
236 }
237 }
238 }
239 else
240 em.addMember(sc, this, 1);
241
242 /* Compute .min, .max and .default values.
243 * If enum doesn't have a name, we can never identify the enum type,
244 * so there is no purpose for a .min, .max or .default
245 */
246 if (!isAnonymous())
247 {
248 if (first)
249 { defaultval = e;
250 minval = e;
251 maxval = e;
252 }
253 else
254 { Expression ec;
255
256 /* In order to work successfully with UDTs,
257 * build expressions to do the comparisons,
258 * and let the semantic analyzer and constant
259 * folder give us the result.
260 */
261
262 // Compute if(e < minval)
263 ec = new CmpExp(TOK.TOKlt, em.loc, e, minval);
264 ec = ec.semantic(sce);
265 ec = ec.optimize(WANT.WANTvalue | WANT.WANTinterpret);
266 if (ec.toInteger())
267 minval = e;
268
269 ec = new CmpExp(TOK.TOKgt, em.loc, e, maxval);
270 ec = ec.semantic(sce);
271 ec = ec.optimize(WANT.WANTvalue | WANT.WANTinterpret);
272 if (ec.toInteger())
273 maxval = e;
274 }
275 }
276 first = 0;
277 }
278 //printf("defaultval = %lld\n", defaultval);
279
280 //if (defaultval) printf("defaultval: %s %s\n", defaultval.toChars(), defaultval.type.toChars());
281 if (sc != sce)
282 sce.pop();
283 //members.print();
284 }
285
286 bool oneMember(Dsymbol* ps)
287 {
288 assert(false);
289 }
290
291 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
292 {
293 assert(false);
294 }
295
296 Type getType()
297 {
298 return type;
299 }
300
301 string kind()
302 {
303 return "enum";
304 }
305
306 version (DMDV2) {
307 Dsymbol search(Loc, Identifier ident, int flags)
308 {
309 //printf("%s.EnumDeclaration::search('%s')\n", toChars(), ident->toChars());
310 if (scope_)
311 // Try one last time to resolve this enum
312 semantic(scope_);
313
314 if (!members || !symtab || scope_)
315 {
316 error("is forward referenced when looking for '%s'", ident.toChars());
317 //*(char*)0=0;
318 return null;
319 }
320
321 return ScopeDsymbol.search(loc, ident, flags);
322 }
323 }
324 bool isDeprecated() // is Dsymbol deprecated?
325 {
326 return isdeprecated;
327 }
328
329 void emitComment(Scope sc)
330 {
331 assert(false);
332 }
333
334 void toDocBuffer(OutBuffer buf)
335 {
336 assert(false);
337 }
338
339 EnumDeclaration isEnumDeclaration() { return this; }
340
341 void toObjFile(int multiobj) // compile to .obj file
342 {
343 //printf("EnumDeclaration::toObjFile('%s')\n", toChars());
344 version (DMDV2) {
345 if (isAnonymous())
346 return;
347 }
348
349 if (global.params.symdebug)
350 toDebug();
351
352 type.getTypeInfo(null); // generate TypeInfo
353
354 TypeEnum tc = cast(TypeEnum)type;
355 if (!tc.sym.defaultval || type.isZeroInit(Loc(0))) {
356 ;
357 } else {
358 SC scclass = SCglobal;
359 if (inTemplateInstance())
360 scclass = SCcomdat;
361
362 // Generate static initializer
363 toInitializer();
364 sinit.Sclass = scclass;
365 sinit.Sfl = FLdata;
366 version (ELFOBJ) { // Burton
367 sinit.Sseg = Segment.CDATA;
368 }
369 version (MACHOBJ) {
370 sinit.Sseg = Segment.DATA;
371 }
372 version (DMDV1) {
373 dtnbytes(&sinit.Sdt, tc.size(0), cast(char*)&tc.sym.defaultval);
374 //sinit->Sdt = tc->sym->init->toDt();
375 }
376 version (DMDV2) {
377 tc.sym.defaultval.toDt(&sinit.Sdt);
378 }
379 outdata(sinit);
380 }
381 }
382
383 void toDebug()
384 {
385 assert(false);
386 }
387
388 int cvMember(ubyte* p)
389 {
390 assert(false);
391 }
392
393 Symbol* sinit;
394
395 Symbol* toInitializer()
396 {
397 Symbol* s;
398 Classsym* stag;
399
400 if (!sinit)
401 {
402 stag = fake_classsym(Id.ClassInfo);
403 Identifier ident_save = ident;
404 if (!ident)
405 ident = Lexer.uniqueId("__enum");
406 s = toSymbolX("__init", SCextern, stag.Stype, "Z");
407 ident = ident_save;
408 s.Sfl = FLextern;
409 s.Sflags |= SFLnodebug;
410 slist_add(s);
411 sinit = s;
412 }
413
414 return sinit;
415 }
416 };