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annotate dmd/StaticIfCondition.d @ 187:b0d41ff5e0df

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Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
author Abscissa
date Tue, 07 Jun 2011 23:37:34 -0400
parents e3afd1303184
children
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1 module dmd.StaticIfCondition;
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2
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3 import dmd.common;
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4 import dmd.Expression;
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5 import dmd.ScopeDsymbol;
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6 import dmd.OutBuffer;
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.Condition;
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10 import dmd.HdrGenState;
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11 import dmd.WANT;
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12 import dmd.Util;
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14 import dmd.DDMDExtensions;
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15
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16 class StaticIfCondition : Condition
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17 {
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18 mixin insertMemberExtension!(typeof(this));
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19
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20 Expression exp;
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21
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22 this(Loc loc, Expression exp)
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23 {
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24 register();
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25 super(loc);
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26 this.exp = exp;
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27 }
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29 override Condition syntaxCopy()
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30 {
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31 return new StaticIfCondition(loc, exp.syntaxCopy());
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32 }
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34 override bool include(Scope sc, ScopeDsymbol s)
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35 {
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36 static if (false) {
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37 printf("StaticIfCondition.include(sc = %p, s = %p)\n", sc, s);
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38 if (s)
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39 {
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40 printf("\ts = '%s', kind = %s\n", s.toChars(), s.kind());
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41 }
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42 }
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43 if (inc == 0)
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44 {
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45 if (!sc)
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46 {
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47 error(loc, "static if conditional cannot be at global scope");
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48 inc = 2;
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49 return 0;
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50 }
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51
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52 sc = sc.push(sc.scopesym);
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53 sc.sd = s; // s gets any addMember()
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54 sc.flags |= SCOPE.SCOPEstaticif;
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55 Expression e = exp.semantic(sc);
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56 sc.pop();
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57 e = e.optimize(WANTvalue | WANTinterpret);
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58 if (e.isBool(true))
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59 inc = 1;
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60 else if (e.isBool(false))
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61 inc = 2;
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62 else
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63 {
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64 e.error("expression %s is not constant or does not evaluate to a bool", e.toChars());
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65 inc = 2;
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66 }
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67 }
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68 return (inc == 1);
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69 }
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71 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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72 {
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73 assert(false);
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74 }
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75 }
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