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1 module dmd.StaticDtorDeclaration;
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2
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114
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3 import dmd.common;
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4 import dmd.FuncDeclaration;
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5 import dmd.VarDeclaration;
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6 import dmd.Dsymbol;
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7 import dmd.Loc;
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8 import dmd.Scope;
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9 import dmd.AggregateDeclaration;
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10 import dmd.OutBuffer;
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11 import dmd.HdrGenState;
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12 import dmd.STC;
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13 import dmd.Identifier;
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14 import dmd.ClassDeclaration;
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15 import dmd.Type;
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16 import dmd.TypeFunction;
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17 import dmd.LINK;
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18 import dmd.Lexer;
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19 import dmd.Statement;
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20 import dmd.Expression;
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21 import dmd.EqualExp;
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22 import dmd.ArrayTypes;
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23 import dmd.DeclarationStatement;
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24 import dmd.IdentifierExp;
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25 import dmd.AddAssignExp;
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26 import dmd.IntegerExp;
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27 import dmd.TOK;
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28 import dmd.IfStatement;
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29 import dmd.ReturnStatement;
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30 import dmd.CompoundStatement;
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31 import dmd.Module;
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32
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33 class StaticDtorDeclaration : FuncDeclaration
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34 {
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35 VarDeclaration vgate; // 'gate' variable
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36
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100
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37 this(Loc loc, Loc endloc)
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38 {
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39 super(loc, endloc, Identifier.generateId("_staticDtor"), STCstatic, null);
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40 }
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41
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100
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42 override Dsymbol syntaxCopy(Dsymbol s)
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43 {
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44 assert(!s);
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45 StaticDtorDeclaration sdd = new StaticDtorDeclaration(loc, endloc);
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46 return super.syntaxCopy(sdd);
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47 }
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48
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49 override void semantic(Scope sc)
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50 {
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51 ClassDeclaration cd;
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52 Type tret;
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53
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54 cd = sc.scopesym.isClassDeclaration();
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55 if (!cd)
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56 {
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57 }
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58 type = new TypeFunction(null, Type.tvoid, false, LINK.LINKd);
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59
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60 /* If the static ctor appears within a template instantiation,
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61 * it could get called multiple times by the module constructors
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62 * for different modules. Thus, protect it with a gate.
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63 */
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64 if (inTemplateInstance())
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65 {
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66 /* Add this prefix to the function:
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67 * static int gate;
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68 * if (--gate != 0) return;
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69 * Increment gate during constructor execution.
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70 * Note that this is not thread safe; should not have threads
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71 * during static destruction.
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72 */
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73 Identifier id = Lexer.idPool("__gate");
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74 VarDeclaration v = new VarDeclaration(Loc(0), Type.tint32, id, null);
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75 v.storage_class = STCstatic;
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76 Statements sa = new Statements();
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77 Statement s = new DeclarationStatement(Loc(0), v);
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78 sa.push(cast(void*)s);
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79 Expression e = new IdentifierExp(Loc(0), id);
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80 e = new AddAssignExp(Loc(0), e, new IntegerExp(-1));
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81 e = new EqualExp(TOKnotequal, Loc(0), e, new IntegerExp(0));
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82 s = new IfStatement(Loc(0), null, e, new ReturnStatement(Loc(0), null), null);
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83 sa.push(cast(void*)s);
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84 if (fbody)
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85 sa.push(cast(void*)fbody);
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86 fbody = new CompoundStatement(Loc(0), sa);
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87 vgate = v;
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88 }
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89
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90 FuncDeclaration.semantic(sc);
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91
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92 // We're going to need ModuleInfo
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93 Module m = getModule();
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94 if (!m)
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95 m = sc.module_;
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96 if (m)
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97 {
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98 m.needmoduleinfo = 1;
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98
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99 // writef("module2 %s needs moduleinfo\n", m.toChars());
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100 version (IN_GCC) {
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101 m.strictlyneedmoduleinfo = 1;
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102 }
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103 }
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104 }
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105
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106 override AggregateDeclaration isThis()
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107 {
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108 return null;
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109 }
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110
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111 override bool isStaticDestructor()
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112 {
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113 return true;
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114 }
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115
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116 override bool isVirtual()
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117 {
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118 return false;
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119 }
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120
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121 override bool addPreInvariant()
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122 {
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123 return false;
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124 }
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125
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126 override bool addPostInvariant()
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127 {
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128 return false;
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129 }
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130
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131 override void emitComment(Scope sc)
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132 {
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133 }
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134
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135 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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136 {
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137 if (hgs.hdrgen)
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138 return;
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139 buf.writestring("static ~this()");
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140 bodyToCBuffer(buf, hgs);
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141 }
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142
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79
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143 override void toJsonBuffer(OutBuffer buf)
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144 {
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145 }
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146
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100
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147 override StaticDtorDeclaration isStaticDtorDeclaration() { return this; }
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72
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148 }
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