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comparison dmd/Optimize.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 e28b18c23469
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-1:000000000000 0:10317f0c89a5
1 module dmd.Optimize;
2
3 import dmd.Expression;
4 import dmd.TOK;
5 import dmd.VarExp;
6 import dmd.VarDeclaration;
7 import dmd.STC;
8 import dmd.AssignExp;
9 import dmd.Type;
10 import dmd.WANT;
11 import dmd.TY;
12
13 /*************************************
14 * If variable has a const initializer,
15 * return that initializer.
16 */
17
18 Expression expandVar(int result, VarDeclaration v)
19 {
20 //printf("expandVar(result = %d, v = %p, %s)\n", result, v, v ? v.toChars() : "null");
21
22 Expression e = null;
23 if (!v)
24 return e;
25
26 if (v.isConst() || v.isInvariant() || v.storage_class & STC.STCmanifest)
27 {
28 if (!v.type)
29 {
30 //error("ICE");
31 return e;
32 }
33
34 Type tb = v.type.toBasetype();
35 if (result & WANT.WANTinterpret ||
36 v.storage_class & STC.STCmanifest ||
37 (tb.ty != TY.Tsarray && tb.ty != TY.Tstruct)
38 )
39 {
40 if (v.init)
41 {
42 if (v.inuse)
43 { if (v.storage_class & STC.STCmanifest)
44 v.error("recursive initialization of constant");
45 goto L1;
46 }
47 Expression ei = v.init.toExpression();
48 if (!ei)
49 goto L1;
50 if (ei.op == TOK.TOKconstruct || ei.op == TOK.TOKblit)
51 { AssignExp ae = cast(AssignExp)ei;
52 ei = ae.e2;
53 if (ei.isConst() != 1 && ei.op != TOK.TOKstring)
54 goto L1;
55 if (ei.type != v.type)
56 goto L1;
57 }
58 if (v.scope_)
59 {
60 v.inuse++;
61 e = ei.syntaxCopy();
62 e = e.semantic(v.scope_);
63 e = e.implicitCastTo(v.scope_, v.type);
64 // enabling this line causes test22 in test suite to fail
65 //ei.type = e.type;
66 v.scope_ = null;
67 v.inuse--;
68 }
69 else if (!ei.type)
70 {
71 goto L1;
72 }
73 else
74 // Should remove the copy() operation by
75 // making all mods to expressions copy-on-write
76 e = ei.copy();
77 }
78 else
79 {
80 static if (true) {
81 goto L1;
82 } else {
83 // BUG: what if const is initialized in constructor?
84 e = v.type.defaultInit();
85 e.loc = e1.loc;
86 }
87 }
88 if (e.type != v.type)
89 {
90 e = e.castTo(null, v.type);
91 }
92 v.inuse++;
93 e = e.optimize(result);
94 v.inuse--;
95 }
96 }
97 L1:
98 //if (e) printf("\te = %s, e.type = %s\n", e.toChars(), e.type.toChars());
99 return e;
100 }