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2 // Copyright (c) 1999-2005 by Digital Mars
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3 // All Rights Reserved
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4 // written by Walter Bright
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5 // http://www.digitalmars.com
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6 // License for redistribution is by either the Artistic License
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7 // in artistic.txt, or the GNU General Public License in gnu.txt.
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8 // See the included readme.txt for details.
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9
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10 #include <stdio.h>
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11 #include <assert.h>
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12
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13 #include "root.h"
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14
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15 #include "mars.h"
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16 #include "init.h"
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17 #include "identifier.h"
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18 #include "attrib.h"
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19 #include "dsymbol.h"
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20 #include "scope.h"
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21 #include "declaration.h"
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22 #include "aggregate.h"
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23 #include "module.h"
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24 #include "id.h"
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25
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26 Scope *Scope::freelist = NULL;
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27
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28 void *Scope::operator new(size_t size)
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29 {
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30 if (freelist)
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31 {
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32 Scope *s = freelist;
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33 freelist = s->enclosing;
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34 //printf("freelist %p\n", s);
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35 assert(s->flags & SCOPEfree);
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36 s->flags &= ~SCOPEfree;
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37 return s;
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38 }
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39
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40 void *p = ::operator new(size);
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41 //printf("new %p\n", p);
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42 return p;
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43 }
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44
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45 Scope::Scope()
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46 { // Create root scope
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47
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48 //printf("Scope::Scope() %p\n", this);
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49 this->module = NULL;
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50 this->scopesym = NULL;
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51 this->sd = NULL;
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52 this->enclosing = NULL;
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53 this->parent = NULL;
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54 this->sw = NULL;
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55 this->tf = NULL;
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56 this->sbreak = NULL;
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57 this->scontinue = NULL;
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58 this->fes = NULL;
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59 this->structalign = global.structalign;
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60 this->func = NULL;
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61 this->slabel = NULL;
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62 this->linkage = LINKd;
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63 this->protection = PROTpublic;
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64 this->explicitProtection = 0;
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65 this->stc = 0;
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66 this->offset = 0;
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67 this->inunion = 0;
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68 this->incontract = 0;
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69 this->nofree = 0;
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70 this->noctor = 0;
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71 this->intypeof = 0;
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72 this->parameterSpecialization = 0;
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73 this->callSuper = 0;
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74 this->flags = 0;
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75 this->anonAgg = NULL;
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76 this->lastdc = NULL;
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77 this->lastoffset = 0;
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78 this->docbuf = NULL;
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79 }
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80
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81 Scope::Scope(Scope *enclosing)
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82 {
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83 //printf("Scope::Scope(enclosing = %p) %p\n", enclosing, this);
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84 assert(!(enclosing->flags & SCOPEfree));
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85 this->module = enclosing->module;
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86 this->func = enclosing->func;
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87 this->parent = enclosing->parent;
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88 this->scopesym = NULL;
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89 this->sd = NULL;
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90 this->sw = enclosing->sw;
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91 this->tf = enclosing->tf;
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92 this->sbreak = enclosing->sbreak;
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93 this->scontinue = enclosing->scontinue;
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94 this->fes = enclosing->fes;
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95 this->structalign = enclosing->structalign;
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96 this->enclosing = enclosing;
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97 #ifdef DEBUG
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98 if (enclosing->enclosing)
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99 assert(!(enclosing->enclosing->flags & SCOPEfree));
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100 if (this == enclosing->enclosing)
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101 {
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102 printf("this = %p, enclosing = %p, enclosing->enclosing = %p\n", this, enclosing, enclosing->enclosing);
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103 }
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104 assert(this != enclosing->enclosing);
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105 #endif
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106 this->slabel = NULL;
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107 this->linkage = enclosing->linkage;
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108 this->protection = enclosing->protection;
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109 this->explicitProtection = enclosing->explicitProtection;
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110 this->stc = enclosing->stc;
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111 this->offset = 0;
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112 this->inunion = enclosing->inunion;
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113 this->incontract = enclosing->incontract;
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114 this->nofree = 0;
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115 this->noctor = enclosing->noctor;
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116 this->intypeof = enclosing->intypeof;
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117 this->parameterSpecialization = enclosing->parameterSpecialization;
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118 this->callSuper = enclosing->callSuper;
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119 this->flags = 0;
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120 this->anonAgg = NULL;
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121 this->lastdc = NULL;
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122 this->lastoffset = 0;
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123 this->docbuf = enclosing->docbuf;
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124 assert(this != enclosing);
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125 }
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126
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127 Scope *Scope::createGlobal(Module *module)
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128 {
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129 Scope *sc;
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130
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131 sc = new Scope();
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132 sc->module = module;
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133 sc->scopesym = new ScopeDsymbol();
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134 sc->scopesym->symtab = new DsymbolTable();
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135
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136 // Add top level package as member of this global scope
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137 Dsymbol *m = module;
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138 while (m->parent)
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139 m = m->parent;
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140 m->addMember(NULL, sc->scopesym, 1);
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141 m->parent = NULL; // got changed by addMember()
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142
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143 // Create the module scope underneath the global scope
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144 sc = sc->push(module);
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145 sc->parent = module;
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146 return sc;
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147 }
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148
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149 Scope *Scope::push()
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150 {
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151 //printf("Scope::push()\n");
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152 Scope *s = new Scope(this);
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153 assert(this != s);
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154 return s;
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155 }
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156
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157 Scope *Scope::push(ScopeDsymbol *ss)
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158 {
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159 //printf("Scope::push(%s)\n", ss->toChars());
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160 Scope *s = push();
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161 s->scopesym = ss;
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162 return s;
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163 }
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164
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165 Scope *Scope::pop()
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166 {
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167 //printf("Scope::pop() %p nofree = %d\n", this, nofree);
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168 Scope *enc = enclosing;
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169
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170 if (enclosing)
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171 enclosing->callSuper |= callSuper;
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172
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173 if (!nofree)
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174 { enclosing = freelist;
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175 freelist = this;
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176 flags |= SCOPEfree;
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177 }
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178
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179 return enc;
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180 }
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181
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182 void Scope::mergeCallSuper(Loc loc, unsigned cs)
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183 {
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184 // This does a primitive flow analysis to support the restrictions
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185 // regarding when and how constructors can appear.
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186 // It merges the results of two paths.
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187 // The two paths are callSuper and cs; the result is merged into callSuper.
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188
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189 if (cs != callSuper)
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190 { int a;
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191 int b;
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192
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193 callSuper |= cs & (CSXany_ctor | CSXlabel);
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194 if (cs & CSXreturn)
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195 {
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196 }
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197 else if (callSuper & CSXreturn)
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198 {
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199 callSuper = cs | (callSuper & (CSXany_ctor | CSXlabel));
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200 }
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201 else
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202 {
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203 a = (cs & (CSXthis_ctor | CSXsuper_ctor)) != 0;
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204 b = (callSuper & (CSXthis_ctor | CSXsuper_ctor)) != 0;
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205 if (a != b)
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206 error(loc, "one path skips constructor");
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207 callSuper |= cs;
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208 }
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209 }
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210 }
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211
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212 Dsymbol *Scope::search(Loc loc, Identifier *ident, Dsymbol **pscopesym)
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213 { Dsymbol *s;
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214 Scope *sc;
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215
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216 //printf("Scope::search(%p, '%s')\n", this, ident->toChars());
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217 if (ident == Id::empty)
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218 {
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219 // Look for module scope
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220 for (sc = this; sc; sc = sc->enclosing)
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221 {
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222 assert(sc != sc->enclosing);
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223 if (sc->scopesym)
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224 {
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225 s = sc->scopesym->isModule();
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226 if (s)
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227 {
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228 //printf("\tfound %s.%s\n", s->parent ? s->parent->toChars() : "", s->toChars());
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229 if (pscopesym)
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230 *pscopesym = sc->scopesym;
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231 return s;
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232 }
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233 }
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234 }
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235 return NULL;
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236 }
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237
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238 for (sc = this; sc; sc = sc->enclosing)
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239 {
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240 assert(sc != sc->enclosing);
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241 if (sc->scopesym)
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242 {
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243 //printf("\tlooking in scopesym '%s', kind = '%s'\n", sc->scopesym->toChars(), sc->scopesym->kind());
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244 s = sc->scopesym->search(loc, ident, 0);
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245 if (s)
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246 {
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247 if ((global.params.warnings ||
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248 global.params.Dversion > 1) &&
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249 ident == Id::length &&
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250 sc->scopesym->isArrayScopeSymbol() &&
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251 sc->enclosing &&
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252 sc->enclosing->search(loc, ident, NULL))
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253 {
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254 if (global.params.warnings)
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255 fprintf(stdmsg, "warning - ");
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256 error(s->loc, "array 'length' hides other 'length' name in outer scope");
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257 }
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258
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259 //printf("\tfound %s.%s, kind = '%s'\n", s->parent ? s->parent->toChars() : "", s->toChars(), s->kind());
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260 if (pscopesym)
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261 *pscopesym = sc->scopesym;
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262 return s;
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263 }
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264 }
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265 }
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266
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267 return NULL;
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268 }
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269
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270 Dsymbol *Scope::insert(Dsymbol *s)
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271 { Scope *sc;
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272
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273 for (sc = this; sc; sc = sc->enclosing)
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274 {
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275 //printf("\tsc = %p\n", sc);
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276 if (sc->scopesym)
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277 {
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278 //printf("\t\tsc->scopesym = %p\n", sc->scopesym);
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279 if (!sc->scopesym->symtab)
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280 sc->scopesym->symtab = new DsymbolTable();
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281 return sc->scopesym->symtab->insert(s);
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282 }
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283 }
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284 assert(0);
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285 return NULL;
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286 }
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287
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288 /********************************************
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289 * Search enclosing scopes for ClassDeclaration.
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290 */
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291
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292 ClassDeclaration *Scope::getClassScope()
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293 { Scope *sc;
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294
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295 for (sc = this; sc; sc = sc->enclosing)
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296 {
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297 ClassDeclaration *cd;
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298
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299 if (sc->scopesym)
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300 {
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301 cd = sc->scopesym->isClassDeclaration();
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302 if (cd)
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303 return cd;
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304 }
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305 }
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306 return NULL;
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307 }
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308
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309 /********************************************
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310 * Search enclosing scopes for ClassDeclaration.
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311 */
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312
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313 AggregateDeclaration *Scope::getStructClassScope()
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314 { Scope *sc;
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315
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316 for (sc = this; sc; sc = sc->enclosing)
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317 {
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318 AggregateDeclaration *ad;
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319
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320 if (sc->scopesym)
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321 {
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322 ad = sc->scopesym->isClassDeclaration();
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323 if (ad)
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324 return ad;
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325 else
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326 { ad = sc->scopesym->isStructDeclaration();
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327 if (ad)
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328 return ad;
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329 }
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330 }
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331 }
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332 return NULL;
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333 }
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334
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335 /*******************************************
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336 * For TemplateDeclarations, we need to remember the Scope
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337 * where it was declared. So mark the Scope as not
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338 * to be free'd.
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339 */
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340
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341 void Scope::setNoFree()
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342 { Scope *sc;
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343 //int i = 0;
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344
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345 //printf("Scope::setNoFree(this = %p)\n", this);
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346 for (sc = this; sc; sc = sc->enclosing)
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347 {
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348 //printf("\tsc = %p\n", sc);
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349 sc->nofree = 1;
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350
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351 assert(!(flags & SCOPEfree));
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352 //assert(sc != sc->enclosing);
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353 //assert(!sc->enclosing || sc != sc->enclosing->enclosing);
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354 //if (++i == 10)
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355 //assert(0);
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356 }
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357 }
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