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comparison dmd/ArrayScopeSymbol.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 4caad35a6ceb
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-1:000000000000 0:10317f0c89a5
1 module dmd.ArrayScopeSymbol;
2
3 import dmd.ScopeDsymbol;
4 import dmd.Expression;
5 import dmd.TypeTuple;
6 import dmd.TupleDeclaration;
7 import dmd.Scope;
8 import dmd.Dsymbol;
9 import dmd.Loc;
10 import dmd.TOK;
11 import dmd.Identifier;
12 import dmd.Id;
13 import dmd.TY;
14 import dmd.TupleExp;
15 import dmd.StringExp;
16 import dmd.WANT;
17 import dmd.TypeExp;
18 import dmd.Type;
19 import dmd.SliceExp;
20 import dmd.IndexExp;
21 import dmd.IntegerExp;
22 import dmd.STC;
23 import dmd.ExpInitializer;
24 import dmd.VarDeclaration;
25 import dmd.ArrayLiteralExp;
26 import dmd.expression.Util;
27
28 class ArrayScopeSymbol : ScopeDsymbol
29 {
30 Expression exp; // IndexExp or SliceExp
31 TypeTuple type; // for tuple[length]
32 TupleDeclaration td; // for tuples of objects
33 Scope sc;
34
35 this(Scope sc, Expression e)
36 {
37 super();
38 assert(e.op == TOKindex || e.op == TOKslice);
39 this.exp = e;
40 this.sc = sc;
41 }
42
43 this(Scope sc, TypeTuple t)
44 {
45 assert(false);
46 }
47
48 this(Scope sc, TupleDeclaration td)
49 {
50 assert(false);
51 }
52
53 Dsymbol search(Loc loc, Identifier ident, int flags)
54 {
55 //printf("ArrayScopeSymbol.search('%s', flags = %d)\n", ident.toChars(), flags);
56 if (ident == Id.length || ident == Id.dollar)
57 {
58 VarDeclaration* pvar;
59 Expression ce;
60
61 L1:
62 if (td)
63 { /* $ gives the number of elements in the tuple
64 */
65 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
66 Expression e = new IntegerExp(Loc(0), td.objects.dim, Type.tsize_t);
67 v.init = new ExpInitializer(Loc(0), e);
68 v.storage_class |= STCstatic | STCconst;
69 v.semantic(sc);
70 return v;
71 }
72
73 if (type)
74 { /* $ gives the number of type entries in the type tuple
75 */
76 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
77 Expression e = new IntegerExp(Loc(0), type.arguments.dim, Type.tsize_t);
78 v.init = new ExpInitializer(Loc(0), e);
79 v.storage_class |= STCstatic | STCconst;
80 v.semantic(sc);
81 return v;
82 }
83
84 if (exp.op == TOKindex)
85 { /* array[index] where index is some function of $
86 */
87 IndexExp ie = cast(IndexExp)exp;
88
89 pvar = &ie.lengthVar;
90 ce = ie.e1;
91 }
92 else if (exp.op == TOKslice)
93 { /* array[lwr .. upr] where lwr or upr is some function of $
94 */
95 SliceExp se = cast(SliceExp)exp;
96
97 pvar = &se.lengthVar;
98 ce = se.e1;
99 }
100 else
101 /* Didn't find $, look in enclosing scope(s).
102 */
103 return null;
104
105 /* If we are indexing into an array that is really a type
106 * tuple, rewrite this as an index into a type tuple and
107 * try again.
108 */
109 if (ce.op == TOKtype)
110 {
111 Type t = (cast(TypeExp)ce).type;
112 if (t.ty == Ttuple)
113 {
114 type = cast(TypeTuple)t;
115 goto L1;
116 }
117 }
118
119 /* *pvar is lazily initialized, so if we refer to $
120 * multiple times, it gets set only once.
121 */
122 if (!*pvar) // if not already initialized
123 { /* Create variable v and set it to the value of $,
124 * which will be a constant.
125 */
126 VarDeclaration v = new VarDeclaration(loc, Type.tsize_t, Id.dollar, null);
127
128 if (ce.op == TOKvar)
129 { // if ce is const, get its initializer
130 ce = fromConstInitializer(WANTvalue | WANTinterpret, ce);
131 }
132
133 if (ce.op == TOKstring)
134 { /* It is for a string literal, so the
135 * length will be a const.
136 */
137 Expression e = new IntegerExp(Loc(0), (cast(StringExp)ce).len, Type.tsize_t);
138 v.init = new ExpInitializer(Loc(0), e);
139 v.storage_class |= STCstatic | STCconst;
140 }
141 else if (ce.op == TOKarrayliteral)
142 { /* It is for an array literal, so the
143 * length will be a const.
144 */
145 Expression e = new IntegerExp(Loc(0), (cast(ArrayLiteralExp)ce).elements.dim, Type.tsize_t);
146 v.init = new ExpInitializer(Loc(0), e);
147 v.storage_class |= STCstatic | STCconst;
148 }
149 else if (ce.op == TOKtuple)
150 { /* It is for an expression tuple, so the
151 * length will be a const.
152 */
153 Expression e = new IntegerExp(Loc(0), (cast(TupleExp)ce).exps.dim, Type.tsize_t);
154 v.init = new ExpInitializer(Loc(0), e);
155 v.storage_class |= STCstatic | STCconst;
156 }
157 *pvar = v;
158 }
159 (*pvar).semantic(sc);
160 return (*pvar);
161 }
162 return null;
163 }
164
165 ArrayScopeSymbol isArrayScopeSymbol() { return this; }
166 }