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0
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1 module dmd.TemplateDeclaration;
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2
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3 import dmd.Loc;
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4 import dmd.ScopeDsymbol;
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5 import dmd.ArrayTypes;
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6 import dmd.Dsymbol;
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7 import dmd.STC;
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8 import dmd.TemplateThisParameter;
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9 import dmd.Global;
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10 import dmd.Array;
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11 import dmd.Identifier;
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12 import dmd.TypeArray;
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13 import dmd.Expression;
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14 import dmd.Scope;
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15 import dmd.TypeIdentifier;
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16 import dmd.TypeDelegate;
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17 import dmd.IntegerExp;
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18 import dmd.TypeSArray;
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19 import dmd.StringExp;
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20 import dmd.TOK;
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21 import dmd.Argument;
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22 import dmd.CtorDeclaration;
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23 import dmd.TypeFunction;
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24 import dmd.TY;
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25 import dmd.OutBuffer;
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26 import dmd.Declaration;
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27 import dmd.HdrGenState;
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28 import dmd.TemplateInstance;
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29 import dmd.WANT;
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30 import dmd.FuncDeclaration;
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31 import dmd.TemplateTupleParameter;
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32 import dmd.MATCH;
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33 import dmd.Type;
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34 import dmd.Tuple;
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35 import dmd.TupleDeclaration;
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36 import dmd.Initializer;
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37 import dmd.ExpInitializer;
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38 import dmd.TemplateValueParameter;
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39 import dmd.AliasDeclaration;
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40 import dmd.VarDeclaration;
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41 import dmd.TemplateParameter;
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42 import dmd.TemplateTypeParameter;
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43
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44 import dmd.expression.Util;
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45
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46 import std.stdio;
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47
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48 /**************************************
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49 * Determine if TemplateDeclaration is variadic.
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50 */
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51
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52 TemplateTupleParameter isVariadic(TemplateParameters parameters)
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53 {
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54 size_t dim = parameters.dim;
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55 TemplateTupleParameter tp = null;
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56
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57 if (dim)
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58 tp = (cast(TemplateParameter)parameters.data[dim - 1]).isTemplateTupleParameter();
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59
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60 return tp;
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61 }
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62
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63 void ObjectToCBuffer(OutBuffer buf, HdrGenState* hgs, Object oarg)
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64 {
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65 //printf("ObjectToCBuffer()\n");
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66 Type t = isType(oarg);
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67 Expression e = isExpression(oarg);
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68 Dsymbol s = isDsymbol(oarg);
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69 Tuple v = isTuple(oarg);
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70 if (t)
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71 {
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72 //printf("\tt: %s ty = %d\n", t.toChars(), t.ty);
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73 t.toCBuffer(buf, null, hgs);
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74 }
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75 else if (e)
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76 e.toCBuffer(buf, hgs);
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77 else if (s)
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78 {
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79 string p = s.ident ? s.ident.toChars() : s.toChars();
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80 buf.writestring(p);
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81 }
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82 else if (v)
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83 {
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84 Objects args = v.objects;
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85 for (size_t i = 0; i < args.dim; i++)
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86 {
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87 if (i)
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88 buf.writeByte(',');
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89 Object o = cast(Object)args.data[i];
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90 ObjectToCBuffer(buf, hgs, o);
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91 }
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92 }
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93 else if (!oarg)
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94 {
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95 buf.writestring("null");
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96 }
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97 else
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98 {
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99 debug writef("bad Object = %p\n", oarg);
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100 assert(0);
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101 }
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102 }
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103
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104 class TemplateDeclaration : ScopeDsymbol
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105 {
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106 TemplateParameters parameters; // array of TemplateParameter's
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107
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108 TemplateParameters origParameters; // originals for Ddoc
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109 Expression constraint;
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110 Array instances; // array of TemplateInstance's
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111
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112 TemplateDeclaration overnext; // next overloaded TemplateDeclaration
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113 TemplateDeclaration overroot; // first in overnext list
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114
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115 int semanticRun; // 1 semantic() run
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116
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117 Dsymbol onemember; // if !=NULL then one member of this template
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118
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119 int literal; // this template declaration is a literal
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120
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121 this(Loc loc, Identifier id, TemplateParameters parameters, Expression constraint, Array decldefs)
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122 {
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123 super(id);
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124
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125 version (LOG) {
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126 printf("TemplateDeclaration(this = %p, id = '%s')\n", this, id.toChars());
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127 }
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128 static if (false) {
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129 if (parameters)
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130 for (int i = 0; i < parameters.dim; i++)
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131 {
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132 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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133 //printf("\tparameter[%d] = %p\n", i, tp);
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134 TemplateTypeParameter ttp = tp.isTemplateTypeParameter();
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135
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136 if (ttp)
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137 {
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138 printf("\tparameter[%d] = %s : %s\n", i, tp.ident.toChars(), ttp.specType ? ttp.specType.toChars() : "");
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139 }
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140 }
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141 }
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142
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143 this.loc = loc;
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144 this.parameters = parameters;
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145 this.origParameters = parameters;
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146 this.constraint = constraint;
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147 this.members = decldefs;
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148
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149 instances = new Array();
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150 }
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151
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152 Dsymbol syntaxCopy(Dsymbol)
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153 {
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154 assert(false);
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155 }
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156
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157 void semantic(Scope sc)
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158 {
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159 version (LOG) {
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160 printf("TemplateDeclaration.semantic(this = %p, id = '%s')\n", this, ident.toChars());
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161 }
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162 if (semanticRun)
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163 return; // semantic() already run
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164 semanticRun = 1;
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165
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166 if (sc.func)
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167 {
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168 version (DMDV1) {
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169 error("cannot declare template at function scope %s", sc.func.toChars());
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170 }
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171 }
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172
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173 if (/*global.params.useArrayBounds &&*/ sc.module_)
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174 {
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175 // Generate this function as it may be used
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176 // when template is instantiated in other modules
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177 sc.module_.toModuleArray();
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178 }
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179
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180 if (/*global.params.useAssert &&*/ sc.module_)
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181 {
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182 // Generate this function as it may be used
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183 // when template is instantiated in other modules
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184 sc.module_.toModuleAssert();
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185 }
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186
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187 /* Remember Scope for later instantiations, but make
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188 * a copy since attributes can change.
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189 */
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190 this.scope_ = new Scope(sc); /// A light copy
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191 this.scope_.setNoFree();
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192
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193 // Set up scope for parameters
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194 ScopeDsymbol paramsym = new ScopeDsymbol();
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195 paramsym.parent = sc.parent;
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196 Scope paramscope = sc.push(paramsym);
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197 paramscope.parameterSpecialization = 1;
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198 paramscope.stc = STCundefined;
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199
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200 if (!parent)
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201 parent = sc.parent;
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202
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203 if (global.params.doDocComments)
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204 {
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205 origParameters = new TemplateParameters();
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206 origParameters.setDim(parameters.dim);
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207 for (int i = 0; i < parameters.dim; i++)
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208 {
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209 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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210 origParameters.data[i] = cast(void*)tp.syntaxCopy();
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211 }
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212 }
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213
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214 for (int i = 0; i < parameters.dim; i++)
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215 {
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216 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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217 tp.declareParameter(paramscope);
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218 }
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219
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220 for (int i = 0; i < parameters.dim; i++)
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221 {
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222 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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223
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224 tp.semantic(paramscope);
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225 if (i + 1 != parameters.dim && tp.isTemplateTupleParameter())
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226 error("template tuple parameter must be last one");
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227 }
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228
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229 paramscope.pop();
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230
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231 if (members)
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232 {
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233 Dsymbol s;
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234 if (Dsymbol.oneMembers(members, &s))
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235 {
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236 if (s && s.ident && s.ident.equals(ident))
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237 {
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238 onemember = s;
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239 s.parent = this;
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240 }
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241 }
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242 }
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243
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244 /* BUG: should check:
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245 * o no virtual functions or non-static data members of classes
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246 */
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247 }
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248
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249 bool overloadInsert(Dsymbol s)
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250 {
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251 assert(false);
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252 }
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253
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254 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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255 {
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256 assert(false);
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257 }
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258
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259 string kind()
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260 {
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261 assert(false);
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262 }
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263
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264 string toChars()
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265 {
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266 assert(false);
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267 }
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268
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269 void emitComment(Scope sc)
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270 {
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271 assert(false);
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272 }
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273
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274 // void toDocBuffer(OutBuffer *buf);
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275
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276 /***************************************
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277 * Given that ti is an instance of this TemplateDeclaration,
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278 * deduce the types of the parameters to this, and store
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279 * those deduced types in dedtypes[].
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280 * Input:
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281 * flag 1: don't do semantic() because of dummy types
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282 * 2: don't change types in matchArg()
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283 * Output:
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284 * dedtypes deduced arguments
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285 * Return match level.
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286 */
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287 MATCH matchWithInstance(TemplateInstance ti, Objects dedtypes, int flag)
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288 {
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289 MATCH m;
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290 int dedtypes_dim = dedtypes.dim;
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291
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292 version (LOGM) {
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293 printf("\n+TemplateDeclaration.matchWithInstance(this = %s, ti = %s, flag = %d)\n", toChars(), ti.toChars(), flag);
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294 }
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295
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296 static if (false) {
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297 printf("dedtypes.dim = %d, parameters.dim = %d\n", dedtypes_dim, parameters.dim);
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298 if (ti.tiargs.dim)
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299 printf("ti.tiargs.dim = %d, [0] = %p\n", ti.tiargs.dim, ti.tiargs.data[0]);
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300 }
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301 dedtypes.zero();
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302
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303 int parameters_dim = parameters.dim;
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304 int variadic = isVariadic() !is null;
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305
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306 // If more arguments than parameters, no match
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307 if (ti.tiargs.dim > parameters_dim && !variadic)
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308 {
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309 version (LOGM) {
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310 printf(" no match: more arguments than parameters\n");
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311 }
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312 return MATCHnomatch;
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313 }
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314
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315 assert(dedtypes_dim == parameters_dim);
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316 assert(dedtypes_dim >= ti.tiargs.dim || variadic);
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317
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318 // Set up scope for parameters
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319 assert(cast(size_t)cast(void*)scope_ > 0x10000);
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320 ScopeDsymbol paramsym = new ScopeDsymbol();
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321 paramsym.parent = scope_.parent;
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322 Scope paramscope = scope_.push(paramsym);
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323 paramscope.stc = STCundefined;
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324
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325 // Attempt type deduction
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326 m = MATCHexact;
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327 for (int i = 0; i < dedtypes_dim; i++)
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328 {
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329 MATCH m2;
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330 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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331 Declaration sparam;
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332
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333 //printf("\targument [%d]\n", i);
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334 version (LOGM) {
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335 //printf("\targument [%d] is %s\n", i, oarg ? oarg.toChars() : "null");
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336 TemplateTypeParameter *ttp = tp.isTemplateTypeParameter();
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337 if (ttp)
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338 printf("\tparameter[%d] is %s : %s\n", i, tp.ident.toChars(), ttp.specType ? ttp.specType.toChars() : "");
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339 }
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340
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341 version (DMDV1) {
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342 m2 = tp.matchArg(paramscope, ti.tiargs, i, parameters, dedtypes, &sparam);
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343 } else {
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344 m2 = tp.matchArg(paramscope, ti.tiargs, i, parameters, dedtypes, &sparam, (flag & 2) ? 1 : 0);
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345 }
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346 //printf("\tm2 = %d\n", m2);
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347
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348 if (m2 == MATCHnomatch)
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349 {
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350 static if (false) {
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351 printf("\tmatchArg() for parameter %i failed\n", i);
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352 }
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353 goto Lnomatch;
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354 }
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355
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356 if (m2 < m)
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357 m = m2;
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358
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359 if (!flag)
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360 sparam.semantic(paramscope);
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361 if (!paramscope.insert(sparam))
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362 goto Lnomatch;
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363 }
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364
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365 if (!flag)
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366 {
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367 /* Any parameter left without a type gets the type of
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368 * its corresponding arg
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369 */
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370 for (int i = 0; i < dedtypes_dim; i++)
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371 {
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372 if (!dedtypes.data[i])
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373 {
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374 assert(i < ti.tiargs.dim);
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375 dedtypes.data[i] = ti.tiargs.data[i];
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376 }
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377 }
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378 }
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379
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380 version (DMDV2) {
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381 if (m && constraint && !(flag & 1))
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382 { /* Check to see if constraint is satisfied.
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383 */
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384 Expression e = constraint.syntaxCopy();
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385 paramscope.flags |= SCOPE.SCOPEstaticif;
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386 e = e.semantic(paramscope);
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387 e = e.optimize(WANTvalue | WANTinterpret);
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388 if (e.isBool(true)) {
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389 ;
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390 } else if (e.isBool(false))
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391 goto Lnomatch;
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392 else
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393 {
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394 e.error("constraint %s is not constant or does not evaluate to a bool", e.toChars());
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395 }
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396 }
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397 }
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398
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399 version (LOGM) {
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400 // Print out the results
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401 printf("--------------------------\n");
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402 printf("template %s\n", toChars());
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403 printf("instance %s\n", ti.toChars());
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404 if (m)
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405 {
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406 for (int i = 0; i < dedtypes_dim; i++)
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407 {
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408 TemplateParameter tp = cast(TemplateParameter)parameters.data[i];
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409 Object oarg;
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410
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411 printf(" [%d]", i);
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412
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413 if (i < ti.tiargs.dim)
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414 oarg = cast(Object)ti.tiargs.data[i];
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415 else
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416 oarg = null;
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417 tp.print(oarg, cast(Object)dedtypes.data[i]);
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418 }
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419 }
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420 else
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421 goto Lnomatch;
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422 }
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423
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424 version (LOGM) {
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425 printf(" match = %d\n", m);
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426 }
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427 goto Lret;
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428
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429 Lnomatch:
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430 version (LOGM) {
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431 printf(" no match\n");
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432 }
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433 m = MATCHnomatch;
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434
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435 Lret:
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436 paramscope.pop();
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437 version (LOGM) {
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438 printf("-TemplateDeclaration.matchWithInstance(this = %p, ti = %p) = %d\n", this, ti, m);
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439 }
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440 return m;
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441 }
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442
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443 MATCH leastAsSpecialized(TemplateDeclaration td2)
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444 {
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|
|
445 assert(false);
|
|
|
446 }
|
|
|
447
|
|
|
448 /*************************************************
|
|
|
449 * Match function arguments against a specific template function.
|
|
|
450 * Input:
|
|
|
451 * loc instantiation location
|
|
|
452 * targsi Expression/Type initial list of template arguments
|
|
|
453 * ethis 'this' argument if !null
|
|
|
454 * fargs arguments to function
|
|
|
455 * Output:
|
|
|
456 * dedargs Expression/Type deduced template arguments
|
|
|
457 * Returns:
|
|
|
458 * match level
|
|
|
459 */
|
|
|
460 MATCH deduceFunctionTemplateMatch(Loc loc, Objects targsi, Expression ethis, Expressions fargs, Objects dedargs)
|
|
|
461 {
|
|
|
462 size_t nfparams;
|
|
|
463 size_t nfargs;
|
|
|
464 size_t nargsi; // array size of targsi
|
|
|
465 int fptupindex = -1;
|
|
|
466 int tuple_dim = 0;
|
|
|
467 MATCH match = MATCHexact;
|
|
|
468 FuncDeclaration fd = onemember.toAlias().isFuncDeclaration();
|
|
|
469 Arguments fparameters; // function parameter list
|
|
|
470 int fvarargs; // function varargs
|
|
|
471 scope Objects dedtypes = new Objects(); // for T:T*, the dedargs is the T*, dedtypes is the T
|
|
|
472
|
|
|
473 static if (false) {
|
|
|
474 printf("\nTemplateDeclaration.deduceFunctionTemplateMatch() %s\n", toChars());
|
|
|
475 for (i = 0; i < fargs.dim; i++)
|
|
|
476 {
|
|
|
477 Expression e = cast(Expression)fargs.data[i];
|
|
|
478 printf("\tfarg[%d] is %s, type is %s\n", i, e.toChars(), e.type.toChars());
|
|
|
479 }
|
|
|
480 printf("fd = %s\n", fd.toChars());
|
|
|
481 printf("fd.type = %p\n", fd.type);
|
|
|
482 }
|
|
|
483
|
|
|
484 assert(cast(size_t)cast(void*)scope_ > 0x10000);
|
|
|
485
|
|
|
486 dedargs.setDim(parameters.dim);
|
|
|
487 dedargs.zero();
|
|
|
488
|
|
|
489 dedtypes.setDim(parameters.dim);
|
|
|
490 dedtypes.zero();
|
|
|
491
|
|
|
492 // Set up scope for parameters
|
|
|
493 ScopeDsymbol paramsym = new ScopeDsymbol();
|
|
|
494 paramsym.parent = scope_.parent;
|
|
|
495 Scope paramscope = scope_.push(paramsym);
|
|
|
496
|
|
|
497 TemplateTupleParameter tp = isVariadic();
|
|
|
498
|
|
|
499 static if (false) {
|
|
|
500 for (i = 0; i < dedargs.dim; i++)
|
|
|
501 {
|
|
|
502 printf("\tdedarg[%d] = ", i);
|
|
|
503 Object oarg = cast(Object)dedargs.data[i];
|
|
|
504 if (oarg) printf("%s", oarg.toChars());
|
|
|
505 printf("\n");
|
|
|
506 }
|
|
|
507 }
|
|
|
508
|
|
|
509
|
|
|
510 nargsi = 0;
|
|
|
511 if (targsi)
|
|
|
512 { // Set initial template arguments
|
|
|
513 size_t n;
|
|
|
514
|
|
|
515 nargsi = targsi.dim;
|
|
|
516 n = parameters.dim;
|
|
|
517 if (tp)
|
|
|
518 n--;
|
|
|
519 if (nargsi > n)
|
|
|
520 {
|
|
|
521 if (!tp)
|
|
|
522 goto Lnomatch;
|
|
|
523
|
|
|
524 /* The extra initial template arguments
|
|
|
525 * now form the tuple argument.
|
|
|
526 */
|
|
|
527 Tuple t = new Tuple();
|
|
|
528 assert(parameters.dim);
|
|
|
529 dedargs.data[parameters.dim - 1] = cast(void*)t;
|
|
|
530
|
|
|
531 tuple_dim = nargsi - n;
|
|
|
532 t.objects.setDim(tuple_dim);
|
|
|
533 for (size_t i = 0; i < tuple_dim; i++)
|
|
|
534 {
|
|
|
535 t.objects.data[i] = cast(void*)targsi.data[n + i];
|
|
|
536 }
|
|
|
537 declareParameter(paramscope, tp, t);
|
|
|
538 }
|
|
|
539 else
|
|
|
540 n = nargsi;
|
|
|
541
|
|
|
542 memcpy(dedargs.data, targsi.data, n * (*dedargs.data).sizeof);
|
|
|
543
|
|
|
544 for (size_t i = 0; i < n; i++)
|
|
|
545 {
|
|
|
546 assert(i < parameters.dim);
|
|
|
547 TemplateParameter tp2 = cast(TemplateParameter)parameters.data[i];
|
|
|
548 MATCH m;
|
|
|
549 Declaration sparam = null;
|
|
|
550
|
|
|
551 m = tp2.matchArg(paramscope, dedargs, i, parameters, dedtypes, &sparam);
|
|
|
552 //printf("\tdeduceType m = %d\n", m);
|
|
|
553 if (m == MATCHnomatch)
|
|
|
554 goto Lnomatch;
|
|
|
555 if (m < match)
|
|
|
556 match = m;
|
|
|
557
|
|
|
558 sparam.semantic(paramscope);
|
|
|
559 if (!paramscope.insert(sparam))
|
|
|
560 goto Lnomatch;
|
|
|
561 }
|
|
|
562 }
|
|
|
563 static if (false) {
|
|
|
564 for (i = 0; i < dedargs.dim; i++)
|
|
|
565 {
|
|
|
566 printf("\tdedarg[%d] = ", i);
|
|
|
567 Object oarg = cast(Object)dedargs.data[i];
|
|
|
568 if (oarg) printf("%s", oarg.toChars());
|
|
|
569 printf("\n");
|
|
|
570 }
|
|
|
571 }
|
|
|
572
|
|
|
573 if (fd.type)
|
|
|
574 {
|
|
|
575 assert(fd.type.ty == Tfunction);
|
|
|
576 TypeFunction fdtype = cast(TypeFunction)fd.type;
|
|
|
577 fparameters = fdtype.parameters;
|
|
|
578 fvarargs = fdtype.varargs;
|
|
|
579 }
|
|
|
580 else
|
|
|
581 {
|
|
|
582 CtorDeclaration fctor = fd.isCtorDeclaration();
|
|
|
583 assert(fctor);
|
|
|
584 fparameters = fctor.arguments;
|
|
|
585 fvarargs = fctor.varargs;
|
|
|
586 }
|
|
|
587
|
|
|
588 nfparams = Argument.dim(fparameters); // number of function parameters
|
|
|
589 nfargs = fargs ? fargs.dim : 0; // number of function arguments
|
|
|
590
|
|
|
591 /* Check for match of function arguments with variadic template
|
|
|
592 * parameter, such as:
|
|
|
593 *
|
|
|
594 * template Foo(T, A...) { void Foo(T t, A a); }
|
|
|
595 * void main() { Foo(1,2,3); }
|
|
|
596 */
|
|
|
597 if (tp) // if variadic
|
|
|
598 {
|
|
|
599 if (nfparams == 0) // if no function parameters
|
|
|
600 {
|
|
|
601 Tuple t = new Tuple();
|
|
|
602 //printf("t = %p\n", t);
|
|
|
603 dedargs.data[parameters.dim - 1] = cast(void*)t;
|
|
|
604 declareParameter(paramscope, tp, t);
|
|
|
605 goto L2;
|
|
|
606 }
|
|
|
607 else if (nfargs < nfparams - 1)
|
|
|
608 goto L1;
|
|
|
609 else
|
|
|
610 {
|
|
|
611 /* Figure out which of the function parameters matches
|
|
|
612 * the tuple template parameter. Do this by matching
|
|
|
613 * type identifiers.
|
|
|
614 * Set the index of this function parameter to fptupindex.
|
|
|
615 */
|
|
|
616 for (fptupindex = 0; fptupindex < nfparams; fptupindex++)
|
|
|
617 {
|
|
|
618 Argument fparam = cast(Argument)fparameters.data[fptupindex];
|
|
|
619 if (fparam.type.ty != Tident)
|
|
|
620 continue;
|
|
|
621 TypeIdentifier tid = cast(TypeIdentifier)fparam.type;
|
|
|
622 if (!tp.ident.equals(tid.ident) || tid.idents.dim)
|
|
|
623 continue;
|
|
|
624
|
|
|
625 if (fvarargs) // variadic function doesn't
|
|
|
626 goto Lnomatch; // go with variadic template
|
|
|
627
|
|
|
628 /* The types of the function arguments
|
|
|
629 * now form the tuple argument.
|
|
|
630 */
|
|
|
631 Tuple t = new Tuple();
|
|
|
632 dedargs.data[parameters.dim - 1] = cast(void*)t;
|
|
|
633
|
|
|
634 tuple_dim = nfargs - (nfparams - 1);
|
|
|
635 t.objects.setDim(tuple_dim);
|
|
|
636 for (size_t i = 0; i < tuple_dim; i++)
|
|
|
637 {
|
|
|
638 Expression farg = cast(Expression)fargs.data[fptupindex + i];
|
|
|
639 t.objects.data[i] = cast(void*)farg.type;
|
|
|
640 }
|
|
|
641 declareParameter(paramscope, tp, t);
|
|
|
642 goto L2;
|
|
|
643 }
|
|
|
644 fptupindex = -1;
|
|
|
645 }
|
|
|
646 }
|
|
|
647
|
|
|
648 L1:
|
|
|
649 if (nfparams == nfargs) {
|
|
|
650 ;
|
|
|
651 } else if (nfargs > nfparams) {
|
|
|
652 if (fvarargs == 0)
|
|
|
653 goto Lnomatch; // too many args, no match
|
|
|
654 match = MATCHconvert; // match ... with a conversion
|
|
|
655 }
|
|
|
656
|
|
|
657 L2:
|
|
|
658 version (DMDV2) {
|
|
|
659 // Match 'ethis' to any TemplateThisParameter's
|
|
|
660 if (ethis)
|
|
|
661 {
|
|
|
662 for (size_t i = 0; i < parameters.dim; i++)
|
|
|
663 {
|
|
|
664 TemplateParameter tp2 = cast(TemplateParameter)parameters.data[i];
|
|
|
665 TemplateThisParameter ttp = tp2.isTemplateThisParameter();
|
|
|
666 if (ttp)
|
|
|
667 {
|
|
|
668 MATCH m;
|
|
|
669
|
|
|
670 Type t = new TypeIdentifier(Loc(0), ttp.ident);
|
|
|
671 m = ethis.type.deduceType(paramscope, t, parameters, dedtypes);
|
|
|
672 if (!m)
|
|
|
673 goto Lnomatch;
|
|
|
674 if (m < match)
|
|
|
675 match = m; // pick worst match
|
|
|
676 }
|
|
|
677 }
|
|
|
678 }
|
|
|
679 }
|
|
|
680
|
|
|
681 // Loop through the function parameters
|
|
|
682 for (size_t i = 0; i < nfparams; i++)
|
|
|
683 {
|
|
|
684 /* Skip over function parameters which wound up
|
|
|
685 * as part of a template tuple parameter.
|
|
|
686 */
|
|
|
687 if (i == fptupindex)
|
|
|
688 {
|
|
|
689 if (fptupindex == nfparams - 1)
|
|
|
690 break;
|
|
|
691 i += tuple_dim - 1;
|
|
|
692 continue;
|
|
|
693 }
|
|
|
694
|
|
|
695 Argument fparam = Argument.getNth(fparameters, i);
|
|
|
696
|
|
|
697 if (i >= nfargs) // if not enough arguments
|
|
|
698 {
|
|
|
699 if (fparam.defaultArg)
|
|
|
700 {
|
|
|
701 /* Default arguments do not participate in template argument
|
|
|
702 * deduction.
|
|
|
703 */
|
|
|
704 goto Lmatch;
|
|
|
705 }
|
|
|
706 }
|
|
|
707 else
|
|
|
708 {
|
|
|
709 Expression farg = cast(Expression)fargs.data[i];
|
|
|
710 static if (false) {
|
|
|
711 printf("\tfarg.type = %s\n", farg.type.toChars());
|
|
|
712 printf("\tfparam.type = %s\n", fparam.type.toChars());
|
|
|
713 }
|
|
|
714 Type argtype = farg.type;
|
|
|
715
|
|
|
716 version (DMDV2) {
|
|
|
717 /* Allow string literals which are type [] to match with [dim]
|
|
|
718 */
|
|
|
719 if (farg.op == TOKstring)
|
|
|
720 {
|
|
|
721 StringExp se = cast(StringExp)farg;
|
|
|
722 if (!se.committed && argtype.ty == Tarray &&
|
|
|
723 fparam.type.toBasetype().ty == Tsarray)
|
|
|
724 {
|
|
|
725 argtype = new TypeSArray(argtype.nextOf(), new IntegerExp(se.loc, se.len, Type.tindex));
|
|
|
726 argtype = argtype.semantic(se.loc, null);
|
|
|
727 argtype = argtype.invariantOf();
|
|
|
728 }
|
|
|
729 }
|
|
|
730 }
|
|
|
731
|
|
|
732 MATCH m;
|
|
|
733 m = argtype.deduceType(paramscope, fparam.type, parameters, dedtypes);
|
|
|
734 //printf("\tdeduceType m = %d\n", m);
|
|
|
735
|
|
|
736 /* If no match, see if there's a conversion to a delegate
|
|
|
737 */
|
|
|
738 if (!m && fparam.type.toBasetype().ty == Tdelegate)
|
|
|
739 {
|
|
|
740 TypeDelegate td = cast(TypeDelegate)fparam.type.toBasetype();
|
|
|
741 TypeFunction tf = cast(TypeFunction)td.next;
|
|
|
742
|
|
|
743 if (!tf.varargs && Argument.dim(tf.parameters) == 0)
|
|
|
744 {
|
|
|
745 m = farg.type.deduceType(paramscope, tf.next, parameters, dedtypes);
|
|
|
746 if (!m && tf.next.toBasetype().ty == Tvoid)
|
|
|
747 m = MATCHconvert;
|
|
|
748 }
|
|
|
749 //printf("\tm2 = %d\n", m);
|
|
|
750 }
|
|
|
751
|
|
|
752 if (m)
|
|
|
753 {
|
|
|
754 if (m < match)
|
|
|
755 match = m; // pick worst match
|
|
|
756 continue;
|
|
|
757 }
|
|
|
758 }
|
|
|
759
|
|
|
760 /* The following code for variadic arguments closely
|
|
|
761 * matches TypeFunction.callMatch()
|
|
|
762 */
|
|
|
763 if (!(fvarargs == 2 && i + 1 == nfparams))
|
|
|
764 goto Lnomatch;
|
|
|
765
|
|
|
766 /* Check for match with function parameter T...
|
|
|
767 */
|
|
|
768 Type tb = fparam.type.toBasetype();
|
|
|
769 switch (tb.ty)
|
|
|
770 {
|
|
|
771 // Perhaps we can do better with this, see TypeFunction.callMatch()
|
|
|
772 case Tsarray:
|
|
|
773 {
|
|
|
774 TypeSArray tsa = cast(TypeSArray)tb;
|
|
|
775 ulong sz = tsa.dim.toInteger();
|
|
|
776 if (sz != nfargs - i)
|
|
|
777 goto Lnomatch;
|
|
|
778 }
|
|
|
779 case Tarray:
|
|
|
780 {
|
|
|
781 TypeArray ta = cast(TypeArray)tb;
|
|
|
782 for (; i < nfargs; i++)
|
|
|
783 {
|
|
|
784 Expression arg = cast(Expression)fargs.data[i];
|
|
|
785 assert(arg);
|
|
|
786 MATCH m;
|
|
|
787 /* If lazy array of delegates,
|
|
|
788 * convert arg(s) to delegate(s)
|
|
|
789 */
|
|
|
790 Type tret = fparam.isLazyArray();
|
|
|
791 if (tret)
|
|
|
792 {
|
|
|
793 if (ta.next.equals(arg.type))
|
|
|
794 {
|
|
|
795 m = MATCHexact;
|
|
|
796 }
|
|
|
797 else
|
|
|
798 {
|
|
|
799 m = arg.implicitConvTo(tret);
|
|
|
800 if (m == MATCHnomatch)
|
|
|
801 {
|
|
|
802 if (tret.toBasetype().ty == Tvoid)
|
|
|
803 m = MATCHconvert;
|
|
|
804 }
|
|
|
805 }
|
|
|
806 }
|
|
|
807 else
|
|
|
808 {
|
|
|
809 m = arg.type.deduceType(paramscope, ta.next, parameters, dedtypes);
|
|
|
810 //m = arg.implicitConvTo(ta.next);
|
|
|
811 }
|
|
|
812 if (m == MATCHnomatch)
|
|
|
813 goto Lnomatch;
|
|
|
814 if (m < match)
|
|
|
815 match = m;
|
|
|
816 }
|
|
|
817 goto Lmatch;
|
|
|
818 }
|
|
|
819 case Tclass:
|
|
|
820 case Tident:
|
|
|
821 goto Lmatch;
|
|
|
822
|
|
|
823 default:
|
|
|
824 goto Lnomatch;
|
|
|
825 }
|
|
|
826 }
|
|
|
827
|
|
|
828 Lmatch:
|
|
|
829
|
|
|
830 /* Fill in any missing arguments with their defaults.
|
|
|
831 */
|
|
|
832 for (size_t i = nargsi; i < dedargs.dim; i++)
|
|
|
833 {
|
|
|
834 TemplateParameter tp2 = cast(TemplateParameter)parameters.data[i];
|
|
|
835 //printf("tp2[%d] = %s\n", i, tp2.ident.toChars());
|
|
|
836 /* For T:T*, the dedargs is the T*, dedtypes is the T
|
|
|
837 * But for function templates, we really need them to match
|
|
|
838 */
|
|
|
839 Object oarg = cast(Object)dedargs.data[i];
|
|
|
840 Object oded = cast(Object)dedtypes.data[i];
|
|
|
841 //printf("1dedargs[%d] = %p, dedtypes[%d] = %p\n", i, oarg, i, oded);
|
|
|
842 //if (oarg) printf("oarg: %s\n", oarg.toChars());
|
|
|
843 //if (oded) printf("oded: %s\n", oded.toChars());
|
|
|
844 if (!oarg)
|
|
|
845 {
|
|
|
846 if (oded)
|
|
|
847 {
|
|
|
848 if (tp2.specialization())
|
|
|
849 {
|
|
|
850 /* The specialization can work as long as afterwards
|
|
|
851 * the oded == oarg
|
|
|
852 */
|
|
|
853 Declaration sparam;
|
|
|
854 dedargs.data[i] = cast(void*)oded;
|
|
|
855 MATCH m2 = tp2.matchArg(paramscope, dedargs, i, parameters, dedtypes, &sparam, 0);
|
|
|
856 //printf("m2 = %d\n", m2);
|
|
|
857 if (!m2)
|
|
|
858 goto Lnomatch;
|
|
|
859 if (m2 < match)
|
|
|
860 match = m2; // pick worst match
|
|
|
861 if (dedtypes.data[i] !is cast(void*)oded)
|
|
|
862 error("specialization not allowed for deduced parameter %s", tp2.ident.toChars());
|
|
|
863 }
|
|
|
864 }
|
|
|
865 else
|
|
|
866 {
|
|
|
867 oded = tp2.defaultArg(loc, paramscope);
|
|
|
868 if (!oded)
|
|
|
869 goto Lnomatch;
|
|
|
870 }
|
|
|
871 declareParameter(paramscope, tp2, oded);
|
|
|
872 dedargs.data[i] = cast(void*)oded;
|
|
|
873 }
|
|
|
874 }
|
|
|
875
|
|
|
876 version (DMDV2) {
|
|
|
877 if (constraint)
|
|
|
878 { /* Check to see if constraint is satisfied.
|
|
|
879 */
|
|
|
880 Expression e = constraint.syntaxCopy();
|
|
|
881 paramscope.flags |= SCOPE.SCOPEstaticif;
|
|
|
882 e = e.semantic(paramscope);
|
|
|
883 e = e.optimize(WANTvalue | WANTinterpret);
|
|
|
884 if (e.isBool(true)) {
|
|
|
885 ;
|
|
|
886 } else if (e.isBool(false))
|
|
|
887 goto Lnomatch;
|
|
|
888 else
|
|
|
889 {
|
|
|
890 e.error("constraint %s is not constant or does not evaluate to a bool", e.toChars());
|
|
|
891 }
|
|
|
892 }
|
|
|
893 }
|
|
|
894
|
|
|
895 static if (false) {
|
|
|
896 for (i = 0; i < dedargs.dim; i++)
|
|
|
897 {
|
|
|
898 Type t = cast(Type)dedargs.data[i];
|
|
|
899 printf("\tdedargs[%d] = %d, %s\n", i, t.dyncast(), t.toChars());
|
|
|
900 }
|
|
|
901 }
|
|
|
902
|
|
|
903 paramscope.pop();
|
|
|
904 //printf("\tmatch %d\n", match);
|
|
|
905 return match;
|
|
|
906
|
|
|
907 Lnomatch:
|
|
|
908 paramscope.pop();
|
|
|
909 //printf("\tnomatch\n");
|
|
|
910 return MATCHnomatch;
|
|
|
911 }
|
|
|
912
|
|
|
913 /*************************************************
|
|
|
914 * Given function arguments, figure out which template function
|
|
|
915 * to expand, and return that function.
|
|
|
916 * If no match, give error message and return null.
|
|
|
917 * Input:
|
|
|
918 * sc instantiation scope
|
|
|
919 * loc instantiation location
|
|
|
920 * targsi initial list of template arguments
|
|
|
921 * ethis if !null, the 'this' pointer argument
|
|
|
922 * fargs arguments to function
|
|
|
923 * flags 1: do not issue error message on no match, just return null
|
|
|
924 */
|
|
|
925 FuncDeclaration deduceFunctionTemplate(Scope sc, Loc loc, Objects targsi, Expression ethis, Expressions fargs, int flags = 0)
|
|
|
926 {
|
|
|
927 MATCH m_best = MATCHnomatch;
|
|
|
928 TemplateDeclaration td_ambig = null;
|
|
|
929 TemplateDeclaration td_best = null;
|
|
|
930 Objects tdargs = new Objects();
|
|
|
931 TemplateInstance ti;
|
|
|
932 FuncDeclaration fd;
|
|
|
933
|
|
|
934 static if (false) {
|
|
|
935 printf("TemplateDeclaration.deduceFunctionTemplate() %s\n", toChars());
|
|
|
936 printf(" targsi:\n");
|
|
|
937 if (targsi)
|
|
|
938 {
|
|
|
939 for (int i = 0; i < targsi.dim; i++)
|
|
|
940 {
|
|
|
941 Object arg = cast(Object)targsi.data[i];
|
|
|
942 printf("\t%s\n", arg.toChars());
|
|
|
943 }
|
|
|
944 }
|
|
|
945 printf(" fargs:\n");
|
|
|
946 for (int i = 0; i < fargs.dim; i++)
|
|
|
947 {
|
|
|
948 Expression arg = cast(Expression)fargs.data[i];
|
|
|
949 printf("\t%s %s\n", arg.type.toChars(), arg.toChars());
|
|
|
950 //printf("\tty = %d\n", arg.type.ty);
|
|
|
951 }
|
|
|
952 }
|
|
|
953
|
|
|
954 for (TemplateDeclaration td = this; td; td = td.overnext)
|
|
|
955 {
|
|
|
956 if (!td.semanticRun)
|
|
|
957 {
|
|
|
958 error("forward reference to template %s", td.toChars());
|
|
|
959 goto Lerror;
|
|
|
960 }
|
|
|
961 if (!td.onemember || !td.onemember.toAlias().isFuncDeclaration())
|
|
|
962 {
|
|
|
963 error("is not a function template");
|
|
|
964 goto Lerror;
|
|
|
965 }
|
|
|
966
|
|
|
967 MATCH m;
|
|
|
968 scope Objects dedargs = new Objects();
|
|
|
969
|
|
|
970 m = td.deduceFunctionTemplateMatch(loc, targsi, ethis, fargs, dedargs);
|
|
|
971 //printf("deduceFunctionTemplateMatch = %d\n", m);
|
|
|
972 if (!m) // if no match
|
|
|
973 continue;
|
|
|
974
|
|
|
975 if (m < m_best)
|
|
|
976 goto Ltd_best;
|
|
|
977 if (m > m_best)
|
|
|
978 goto Ltd;
|
|
|
979
|
|
|
980 {
|
|
|
981 // Disambiguate by picking the most specialized TemplateDeclaration
|
|
|
982 MATCH c1 = td.leastAsSpecialized(td_best);
|
|
|
983 MATCH c2 = td_best.leastAsSpecialized(td);
|
|
|
984 //printf("c1 = %d, c2 = %d\n", c1, c2);
|
|
|
985
|
|
|
986 if (c1 > c2)
|
|
|
987 goto Ltd;
|
|
|
988 else if (c1 < c2)
|
|
|
989 goto Ltd_best;
|
|
|
990 else
|
|
|
991 goto Lambig;
|
|
|
992 }
|
|
|
993
|
|
|
994 Lambig: // td_best and td are ambiguous
|
|
|
995 td_ambig = td;
|
|
|
996 continue;
|
|
|
997
|
|
|
998 Ltd_best: // td_best is the best match so far
|
|
|
999 td_ambig = null;
|
|
|
1000 continue;
|
|
|
1001
|
|
|
1002 Ltd: // td is the new best match
|
|
|
1003 td_ambig = null;
|
|
|
1004 assert(cast(size_t)cast(void*)td.scope_ > 0x10000);
|
|
|
1005 td_best = td;
|
|
|
1006 m_best = m;
|
|
|
1007 tdargs.setDim(dedargs.dim);
|
|
|
1008 memcpy(tdargs.data, dedargs.data, tdargs.dim * (void*).sizeof);
|
|
|
1009 continue;
|
|
|
1010 }
|
|
|
1011 if (!td_best)
|
|
|
1012 {
|
|
|
1013 if (!(flags & 1))
|
|
|
1014 error(loc, "does not match any function template declaration");
|
|
|
1015 goto Lerror;
|
|
|
1016 }
|
|
|
1017 if (td_ambig)
|
|
|
1018 {
|
|
|
1019 error(loc, "matches more than one function template declaration:\n %s\nand:\n %s",
|
|
|
1020 td_best.toChars(), td_ambig.toChars());
|
|
|
1021 }
|
|
|
1022
|
|
|
1023 /* The best match is td_best with arguments tdargs.
|
|
|
1024 * Now instantiate the template.
|
|
|
1025 */
|
|
|
1026 assert(cast(size_t)cast(void*)td_best.scope_ > 0x10000);
|
|
|
1027 ti = new TemplateInstance(loc, td_best, tdargs);
|
|
|
1028 ti.semantic(sc);
|
|
|
1029 fd = ti.toAlias().isFuncDeclaration();
|
|
|
1030 if (!fd)
|
|
|
1031 goto Lerror;
|
|
|
1032 return fd;
|
|
|
1033
|
|
|
1034 Lerror:
|
|
|
1035 /// version (DMDV2) {
|
|
|
1036 if (!(flags & 1))
|
|
|
1037 /// }
|
|
|
1038 {
|
|
|
1039 HdrGenState hgs;
|
|
|
1040
|
|
|
1041 scope OutBuffer bufa = new OutBuffer();
|
|
|
1042 Objects args = targsi;
|
|
|
1043 if (args)
|
|
|
1044 {
|
|
|
1045 for (int i = 0; i < args.dim; i++)
|
|
|
1046 {
|
|
|
1047 if (i)
|
|
|
1048 bufa.writeByte(',');
|
|
|
1049 Object oarg = cast(Object)args.data[i];
|
|
|
1050 ObjectToCBuffer(bufa, &hgs, oarg);
|
|
|
1051 }
|
|
|
1052 }
|
|
|
1053
|
|
|
1054 scope OutBuffer buf = new OutBuffer();
|
|
|
1055 argExpTypesToCBuffer(buf, fargs, &hgs);
|
|
|
1056 error(loc, "cannot deduce template function from argument types !(%s)(%s)", bufa.toChars(), buf.toChars());
|
|
|
1057 }
|
|
|
1058 return null;
|
|
|
1059 }
|
|
|
1060
|
|
|
1061 /**************************************************
|
|
|
1062 * Declare template parameter tp with value o, and install it in the scope sc.
|
|
|
1063 */
|
|
|
1064 void declareParameter(Scope sc, TemplateParameter tp, Object o)
|
|
|
1065 {
|
|
|
1066 //printf("TemplateDeclaration.declareParameter('%s', o = %p)\n", tp.ident.toChars(), o);
|
|
|
1067
|
|
|
1068 Type targ = isType(o);
|
|
|
1069 Expression ea = isExpression(o);
|
|
|
1070 Dsymbol sa = isDsymbol(o);
|
|
|
1071 Tuple va = isTuple(o);
|
|
|
1072
|
|
|
1073 Dsymbol s;
|
|
|
1074
|
|
|
1075 // See if tp.ident already exists with a matching definition
|
|
|
1076 Dsymbol scopesym;
|
|
|
1077 s = sc.search(loc, tp.ident, &scopesym);
|
|
|
1078 if (s && scopesym == sc.scopesym)
|
|
|
1079 {
|
|
|
1080 TupleDeclaration td = s.isTupleDeclaration();
|
|
|
1081 if (va && td)
|
|
|
1082 {
|
|
|
1083 Tuple tup = new Tuple();
|
|
|
1084 assert(false); // < not implemented
|
|
|
1085 ///tup.objects = *td.objects;
|
|
|
1086 if (match(va, tup, this, sc))
|
|
|
1087 {
|
|
|
1088 return;
|
|
|
1089 }
|
|
|
1090 }
|
|
|
1091 }
|
|
|
1092
|
|
|
1093 if (targ)
|
|
|
1094 {
|
|
|
1095 //printf("type %s\n", targ.toChars());
|
|
|
1096 s = new AliasDeclaration(Loc(0), tp.ident, targ);
|
|
|
1097 }
|
|
|
1098 else if (sa)
|
|
|
1099 {
|
|
|
1100 //printf("Alias %s %s;\n", sa.ident.toChars(), tp.ident.toChars());
|
|
|
1101 s = new AliasDeclaration(Loc(0), tp.ident, sa);
|
|
|
1102 }
|
|
|
1103 else if (ea)
|
|
|
1104 {
|
|
|
1105 // tdtypes.data[i] always matches ea here
|
|
|
1106 Initializer init = new ExpInitializer(loc, ea);
|
|
|
1107 TemplateValueParameter tvp = tp.isTemplateValueParameter();
|
|
|
1108
|
|
|
1109 Type t = tvp ? tvp.valType : null;
|
|
|
1110
|
|
|
1111 VarDeclaration v = new VarDeclaration(loc, t, tp.ident, init);
|
|
|
1112 v.storage_class = STCmanifest;
|
|
|
1113 s = v;
|
|
|
1114 }
|
|
|
1115 else if (va)
|
|
|
1116 {
|
|
|
1117 //printf("\ttuple\n");
|
|
|
1118 s = new TupleDeclaration(loc, tp.ident, va.objects);
|
|
|
1119 }
|
|
|
1120 else
|
|
|
1121 {
|
|
|
1122 debug writefln(o.toString());
|
|
|
1123 assert(0);
|
|
|
1124 }
|
|
|
1125
|
|
|
1126 if (!sc.insert(s))
|
|
|
1127 error("declaration %s is already defined", tp.ident.toChars());
|
|
|
1128
|
|
|
1129 s.semantic(sc);
|
|
|
1130 }
|
|
|
1131
|
|
|
1132 TemplateDeclaration isTemplateDeclaration() { return this; }
|
|
|
1133
|
|
|
1134 TemplateTupleParameter isVariadic()
|
|
|
1135 {
|
|
|
1136 return .isVariadic(parameters);
|
|
|
1137 }
|
|
|
1138
|
|
|
1139 bool isOverloadable()
|
|
|
1140 {
|
|
|
1141 assert(false);
|
|
|
1142 }
|
|
|
1143 } |
