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1 module dmd.StaticCtorDeclaration;
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2
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3 import dmd.FuncDeclaration;
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4 import dmd.Loc;
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5 import dmd.Dsymbol;
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6 import dmd.AggregateDeclaration;
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7 import dmd.Scope;
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8 import dmd.OutBuffer;
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9 import dmd.HdrGenState;
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10 import dmd.STC;
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11 import dmd.Identifier;
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12 import dmd.TypeFunction;
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13 import dmd.Type;
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14 import dmd.LINK;
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15 import dmd.Lexer;
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16 import dmd.VarDeclaration;
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17 import dmd.ArrayTypes;
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18 import dmd.Expression;
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19 import dmd.Statement;
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20 import dmd.DeclarationStatement;
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21 import dmd.AddAssignExp;
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22 import dmd.EqualExp;
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23 import dmd.TOK;
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24 import dmd.IfStatement;
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25 import dmd.CompoundStatement;
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26 import dmd.Module;
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27 import dmd.IntegerExp;
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28 import dmd.ReturnStatement;
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29 import dmd.IdentifierExp;
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30
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31 class StaticCtorDeclaration : FuncDeclaration
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32 {
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33 this(Loc loc, Loc endloc)
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34 {
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35 super(loc, endloc, Identifier.generateId("_staticCtor"), STCstatic, null);
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36 }
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37
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72
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38 override Dsymbol syntaxCopy(Dsymbol)
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39 {
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40 assert(false);
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41 }
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42
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43 override void semantic(Scope sc)
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44 {
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45 //printf("StaticCtorDeclaration.semantic()\n");
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46
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47 type = new TypeFunction(null, Type.tvoid, false, LINK.LINKd);
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48
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49 /* If the static ctor appears within a template instantiation,
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50 * it could get called multiple times by the module constructors
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51 * for different modules. Thus, protect it with a gate.
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52 */
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53 if (inTemplateInstance())
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54 {
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55 /* Add this prefix to the function:
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56 * static int gate;
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57 * if (++gate != 1) return;
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58 * Note that this is not thread safe; should not have threads
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59 * during static construction.
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60 */
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61 Identifier id = Lexer.idPool("__gate");
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62 VarDeclaration v = new VarDeclaration(Loc(0), Type.tint32, id, null);
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63 v.storage_class = STCstatic;
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64 Statements sa = new Statements();
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65 Statement s = new DeclarationStatement(Loc(0), v);
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66 sa.push(cast(void*)s);
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67 Expression e = new IdentifierExp(Loc(0), id);
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68 e = new AddAssignExp(Loc(0), e, new IntegerExp(1));
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69 e = new EqualExp(TOKnotequal, Loc(0), e, new IntegerExp(1));
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70 s = new IfStatement(Loc(0), null, e, new ReturnStatement(Loc(0), null), null);
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71 sa.push(cast(void*)s);
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72 if (fbody)
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73 sa.push(cast(void*)fbody);
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74 fbody = new CompoundStatement(Loc(0), sa);
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75 }
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76
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77 FuncDeclaration.semantic(sc);
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78
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79 // We're going to need ModuleInfo
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80 Module m = getModule();
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81 if (!m)
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82 m = sc.module_;
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83
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84 if (m)
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85 {
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86 m.needmoduleinfo = 1;
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87 version (IN_GCC) {
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88 m.strictlyneedmoduleinfo = 1;
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89 }
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90 }
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91 }
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92
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93 override AggregateDeclaration isThis()
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94 {
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95 return null;
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96 }
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97
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98 override bool isStaticConstructor()
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99 {
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100 return true;
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101 }
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102
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103 override bool isVirtual()
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104 {
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105 return false;
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106 }
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107
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108 override bool addPreInvariant()
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109 {
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110 return false;
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111 }
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112
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113 override bool addPostInvariant()
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114 {
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115 return false;
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116 }
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117
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118 override void emitComment(Scope sc)
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119 {
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120 assert(false);
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121 }
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122
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123 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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124 {
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125 assert(false);
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126 }
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127
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128 override StaticCtorDeclaration isStaticCtorDeclaration() { return this; }
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129 }
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