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