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comparison dmd/DotVarExp.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 ecf732dfe11e
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-1:000000000000 0:10317f0c89a5
1 module dmd.DotVarExp;
2
3 import dmd.Expression;
4 import dmd.Declaration;
5 import dmd.backend.elem;
6 import dmd.UnaExp;
7 import dmd.InterState;
8 import dmd.OutBuffer;
9 import dmd.Loc;
10 import dmd.Scope;
11 import dmd.IRState;
12 import dmd.HdrGenState;
13 import dmd.TOK;
14 import dmd.TupleDeclaration;
15 import dmd.ArrayTypes;
16 import dmd.DsymbolExp;
17 import dmd.TupleExp;
18 import dmd.Global;
19 import dmd.Type;
20 import dmd.Dsymbol;
21 import dmd.AggregateDeclaration;
22 import dmd.VarDeclaration;
23 import dmd.WANT;
24 import dmd.TY;
25 import dmd.ErrorExp;
26 import dmd.FuncDeclaration;
27 import dmd.STC;
28 import dmd.GlobalExpressions;
29 import dmd.VarExp;
30 import dmd.StructLiteralExp;
31 import dmd.PREC;
32
33 import dmd.expression.Util;
34 import dmd.codegen.Util;
35 import dmd.backend.Util;
36 import dmd.backend.mTY;
37 import dmd.backend.OPER;
38 import dmd.backend.TYM;
39
40 class DotVarExp : UnaExp
41 {
42 Declaration var;
43
44 int hasOverloads;
45
46 this(Loc loc, Expression e, Declaration var, int hasOverloads = 0)
47 {
48 super(loc, TOK.TOKdotvar, DotVarExp.sizeof, e);
49 //printf("DotVarExp()\n");
50 this.var = var;
51 this.hasOverloads = hasOverloads;
52 }
53
54 Expression semantic(Scope sc)
55 {
56 version (LOGSEMANTIC) {
57 printf("DotVarExp.semantic('%s')\n", toChars());
58 }
59 if (!type)
60 {
61 var = var.toAlias().isDeclaration();
62
63 TupleDeclaration tup = var.isTupleDeclaration();
64 if (tup)
65 {
66 /* Replace:
67 * e1.tuple(a, b, c)
68 * with:
69 * tuple(e1.a, e1.b, e1.c)
70 */
71 Expressions exps = new Expressions;
72
73 exps.reserve(tup.objects.dim);
74 for (size_t i = 0; i < tup.objects.dim; i++)
75 {
76 Object o = cast(Object)tup.objects.data[i];
77 if (auto e = cast(Expression)o)
78 {
79 if (e.op != TOK.TOKdsymbol)
80 error("%s is not a member", e.toChars());
81 else
82 {
83 DsymbolExp ve = cast(DsymbolExp)e;
84 e = new DotVarExp(loc, e1, ve.s.isDeclaration());
85 exps.push(cast(void*)e);
86 }
87 } else {
88 error("%s is not an expression", o.toString());
89 }
90 }
91 Expression e = new TupleExp(loc, exps);
92 e = e.semantic(sc);
93 return e;
94 }
95
96 e1 = e1.semantic(sc);
97 type = var.type;
98 if (!type && global.errors)
99 {
100 // var is goofed up, just return 0
101 return new ErrorExp();
102 }
103 assert(type);
104
105 if (!var.isFuncDeclaration()) // for functions, do checks after overload resolution
106 {
107 Type t1 = e1.type;
108 if (t1.ty == TY.Tpointer)
109 t1 = t1.nextOf();
110
111 type = type.addMod(t1.mod);
112
113 Dsymbol vparent = var.toParent();
114 AggregateDeclaration ad = vparent ? vparent.isAggregateDeclaration() : null;
115 e1 = getRightThis(loc, sc, ad, e1, var);
116 if (!sc.noaccesscheck)
117 accessCheck(loc, sc, e1, var);
118
119 VarDeclaration v = var.isVarDeclaration();
120 Expression e = expandVar(WANT.WANTvalue, v);
121 if (e)
122 return e;
123 }
124 }
125 //printf("-DotVarExp.semantic('%s')\n", toChars());
126 return this;
127 }
128
129 int isLvalue()
130 {
131 assert(false);
132 }
133
134 Expression toLvalue(Scope sc, Expression e)
135 {
136 //printf("DotVarExp::toLvalue(%s)\n", toChars());
137 return this;
138 }
139
140 Expression modifiableLvalue(Scope sc, Expression e)
141 {
142 static if (false) {
143 printf("DotVarExp::modifiableLvalue(%s)\n", toChars());
144 printf("e1.type = %s\n", e1.type.toChars());
145 printf("var.type = %s\n", var.type.toChars());
146 }
147
148 if (var.isCtorinit())
149 {
150 // It's only modifiable if inside the right constructor
151 Dsymbol s = sc.func;
152 while (true)
153 {
154 FuncDeclaration fd = null;
155 if (s)
156 fd = s.isFuncDeclaration();
157 if (fd && ((fd.isCtorDeclaration() && var.storage_class & STC.STCfield) ||
158 (fd.isStaticCtorDeclaration() && !(var.storage_class & STC.STCfield))) &&
159 fd.toParent() == var.toParent() && e1.op == TOK.TOKthis)
160 {
161 VarDeclaration v = var.isVarDeclaration();
162 assert(v);
163 v.ctorinit = 1;
164 //printf("setting ctorinit\n");
165 }
166 else
167 {
168 if (s)
169 {
170 s = s.toParent2();
171 continue;
172 }
173 else
174 {
175 string p = var.isStatic() ? "static " : "";
176 error("can only initialize %sconst member %s inside %sconstructor", p, var.toChars(), p);
177 }
178 }
179 break;
180 }
181 }
182 else
183 {
184 version (DMDV2) {
185 Type t1 = e1.type.toBasetype();
186
187 if (!t1.isMutable() || (t1.ty == TY.Tpointer && !t1.nextOf().isMutable()) ||
188 !var.type.isMutable() || !var.type.isAssignable() || var.storage_class & STC.STCmanifest)
189 {
190 error("cannot modify const/immutable expression %s", toChars());
191 }
192 }
193 }
194
195 return this;
196 }
197
198 Expression optimize(int result)
199 {
200 //printf("DotVarExp.optimize(result = x%x) %s\n", result, toChars());
201 e1 = e1.optimize(result);
202
203 if (e1.op == TOK.TOKvar)
204 {
205 VarExp ve = cast(VarExp)e1;
206 VarDeclaration v = ve.var.isVarDeclaration();
207 Expression e = expandVar(result, v);
208 if (e && e.op == TOK.TOKstructliteral)
209 {
210 StructLiteralExp sle = cast(StructLiteralExp)e;
211 VarDeclaration vf = var.isVarDeclaration();
212 if (vf)
213 {
214 e = sle.getField(type, vf.offset);
215 if (e && e !is EXP_CANT_INTERPRET)
216 return e;
217 }
218 }
219 }
220 else if (e1.op == TOK.TOKstructliteral)
221 {
222 StructLiteralExp sle = cast(StructLiteralExp)e1;
223 VarDeclaration vf = var.isVarDeclaration();
224 if (vf)
225 {
226 Expression e = sle.getField(type, vf.offset);
227 if (e && e !is EXP_CANT_INTERPRET)
228 return e;
229 }
230 }
231
232 return this;
233 }
234
235 Expression interpret(InterState* istate)
236 {
237 assert(false);
238 }
239
240 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
241 {
242 expToCBuffer(buf, hgs, e1, PREC.PREC_primary);
243 buf.writeByte('.');
244 buf.writestring(var.toChars());
245 }
246
247 void dump(int indent)
248 {
249 assert(false);
250 }
251
252 elem* toElem(IRState* irs)
253 {
254 // *(&e + offset)
255 //printf("DotVarExp.toElem('%s')\n", toChars());
256
257 VarDeclaration v = var.isVarDeclaration();
258 if (!v)
259 {
260 error("%s is not a field, but a %s", var.toChars(), var.kind());
261 }
262
263 elem* e = e1.toElem(irs);
264 Type tb1 = e1.type.toBasetype();
265
266 if (tb1.ty != TY.Tclass && tb1.ty != TY.Tpointer)
267 //e = el_una(OPaddr, TYnptr, e);
268 e = addressElem(e, tb1);
269
270 e = el_bin(OPER.OPadd, TYM.TYnptr, e, el_long(TYM.TYint, v ? v.offset : 0));
271 e = el_una(OPER.OPind, type.totym(), e);
272 if (tybasic(e.Ety) == TYM.TYstruct)
273 {
274 e.Enumbytes = cast(uint)type.size();
275 }
276 el_setLoc(e,loc);
277
278 return e;
279 }
280 }
281