Mercurial > projects > ldc
annotate dmd2/access.c @ 819:446263a8a30d
Fixed taking address of global static array element as constant expression.
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Tue, 02 Dec 2008 01:07:22 +0100 |
parents | f04dde6e882c |
children | 638d16625da2 |
rev | line source |
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758
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1 |
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2 // Copyright (c) 1999-2006 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 |
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11 #include <stdio.h> |
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12 #include <stdlib.h> |
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13 #include <assert.h> |
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14 |
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15 #include "root.h" |
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16 #include "mem.h" |
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17 |
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18 #include "enum.h" |
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19 #include "aggregate.h" |
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20 #include "init.h" |
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21 #include "attrib.h" |
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22 #include "scope.h" |
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23 #include "id.h" |
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24 #include "mtype.h" |
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25 #include "declaration.h" |
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26 #include "aggregate.h" |
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27 #include "expression.h" |
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28 #include "module.h" |
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29 |
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30 #define LOG 0 |
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31 |
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32 /* Code to do access checks |
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33 */ |
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34 |
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35 int hasPackageAccess(Scope *sc, Dsymbol *s); |
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36 |
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37 /**************************************** |
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38 * Return PROT access for Dsymbol smember in this declaration. |
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39 */ |
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40 |
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41 enum PROT AggregateDeclaration::getAccess(Dsymbol *smember) |
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42 { |
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43 return PROTpublic; |
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44 } |
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45 |
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46 enum PROT StructDeclaration::getAccess(Dsymbol *smember) |
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47 { |
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48 enum PROT access_ret = PROTnone; |
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49 |
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50 #if LOG |
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51 printf("+StructDeclaration::getAccess(this = '%s', smember = '%s')\n", |
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52 toChars(), smember->toChars()); |
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53 #endif |
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54 if (smember->toParent() == this) |
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55 { |
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56 access_ret = smember->prot(); |
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57 } |
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58 else if (smember->isDeclaration()->isStatic()) |
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59 { |
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60 access_ret = smember->prot(); |
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61 } |
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62 return access_ret; |
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63 } |
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64 |
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65 enum PROT ClassDeclaration::getAccess(Dsymbol *smember) |
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66 { |
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67 enum PROT access_ret = PROTnone; |
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68 |
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69 #if LOG |
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70 printf("+ClassDeclaration::getAccess(this = '%s', smember = '%s')\n", |
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71 toChars(), smember->toChars()); |
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72 #endif |
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73 if (smember->toParent() == this) |
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74 { |
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75 access_ret = smember->prot(); |
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76 } |
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77 else |
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78 { |
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79 enum PROT access; |
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80 int i; |
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81 |
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82 if (smember->isDeclaration()->isStatic()) |
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83 { |
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84 access_ret = smember->prot(); |
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85 } |
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86 |
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87 for (i = 0; i < baseclasses.dim; i++) |
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88 { BaseClass *b = (BaseClass *)baseclasses.data[i]; |
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89 |
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90 access = b->base->getAccess(smember); |
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91 switch (access) |
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92 { |
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93 case PROTnone: |
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94 break; |
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95 |
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96 case PROTprivate: |
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97 access = PROTnone; // private members of base class not accessible |
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98 break; |
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99 |
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100 case PROTpackage: |
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101 case PROTprotected: |
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102 case PROTpublic: |
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103 case PROTexport: |
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104 // If access is to be tightened |
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105 if (b->protection < access) |
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106 access = b->protection; |
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107 |
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108 // Pick path with loosest access |
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109 if (access > access_ret) |
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110 access_ret = access; |
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111 break; |
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112 |
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113 default: |
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114 assert(0); |
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115 } |
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116 } |
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117 } |
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118 #if LOG |
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119 printf("-ClassDeclaration::getAccess(this = '%s', smember = '%s') = %d\n", |
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120 toChars(), smember->toChars(), access_ret); |
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121 #endif |
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122 return access_ret; |
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123 } |
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124 |
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125 /******************************************************** |
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126 * Helper function for ClassDeclaration::accessCheck() |
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127 * Returns: |
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128 * 0 no access |
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129 * 1 access |
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130 */ |
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131 |
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132 static int accessCheckX( |
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133 Dsymbol *smember, |
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134 Dsymbol *sfunc, |
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135 AggregateDeclaration *dthis, |
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136 AggregateDeclaration *cdscope) |
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137 { |
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138 assert(dthis); |
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139 |
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140 #if 0 |
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141 printf("accessCheckX for %s.%s in function %s() in scope %s\n", |
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142 dthis->toChars(), smember->toChars(), |
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143 sfunc ? sfunc->toChars() : "NULL", |
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144 cdscope ? cdscope->toChars() : "NULL"); |
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145 #endif |
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146 if (dthis->hasPrivateAccess(sfunc) || |
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147 dthis->isFriendOf(cdscope)) |
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148 { |
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149 if (smember->toParent() == dthis) |
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150 return 1; |
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151 else |
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152 { |
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153 ClassDeclaration *cdthis = dthis->isClassDeclaration(); |
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154 if (cdthis) |
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155 { |
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156 for (int i = 0; i < cdthis->baseclasses.dim; i++) |
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157 { BaseClass *b = (BaseClass *)cdthis->baseclasses.data[i]; |
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158 enum PROT access; |
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159 |
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160 access = b->base->getAccess(smember); |
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161 if (access >= PROTprotected || |
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162 accessCheckX(smember, sfunc, b->base, cdscope) |
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163 ) |
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164 return 1; |
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165 |
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166 } |
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167 } |
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168 } |
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169 } |
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170 else |
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171 { |
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172 if (smember->toParent() != dthis) |
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173 { |
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174 ClassDeclaration *cdthis = dthis->isClassDeclaration(); |
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175 if (cdthis) |
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176 { |
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177 for (int i = 0; i < cdthis->baseclasses.dim; i++) |
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178 { BaseClass *b = (BaseClass *)cdthis->baseclasses.data[i]; |
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179 |
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180 if (accessCheckX(smember, sfunc, b->base, cdscope)) |
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181 return 1; |
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182 } |
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183 } |
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184 } |
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185 } |
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186 return 0; |
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187 } |
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188 |
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189 /******************************* |
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190 * Do access check for member of this class, this class being the |
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191 * type of the 'this' pointer used to access smember. |
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192 */ |
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193 |
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194 void AggregateDeclaration::accessCheck(Loc loc, Scope *sc, Dsymbol *smember) |
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195 { |
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196 int result; |
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197 |
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198 FuncDeclaration *f = sc->func; |
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199 AggregateDeclaration *cdscope = sc->getStructClassScope(); |
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200 enum PROT access; |
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201 |
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202 #if LOG |
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203 printf("AggregateDeclaration::accessCheck() for %s.%s in function %s() in scope %s\n", |
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204 toChars(), smember->toChars(), |
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205 f ? f->toChars() : NULL, |
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206 cdscope ? cdscope->toChars() : NULL); |
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207 #endif |
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208 |
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209 Dsymbol *smemberparent = smember->toParent(); |
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210 if (!smemberparent || !smemberparent->isAggregateDeclaration()) |
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211 { |
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212 #if LOG |
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213 printf("not an aggregate member\n"); |
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214 #endif |
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215 return; // then it is accessible |
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216 } |
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217 |
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218 // BUG: should enable this check |
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219 //assert(smember->parent->isBaseOf(this, NULL)); |
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220 |
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221 if (smemberparent == this) |
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222 { enum PROT access = smember->prot(); |
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223 |
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224 result = access >= PROTpublic || |
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225 hasPrivateAccess(f) || |
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226 isFriendOf(cdscope) || |
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227 (access == PROTpackage && hasPackageAccess(sc, this)); |
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228 #if LOG |
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229 printf("result1 = %d\n", result); |
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230 #endif |
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231 } |
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232 else if ((access = this->getAccess(smember)) >= PROTpublic) |
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233 { |
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234 result = 1; |
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235 #if LOG |
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236 printf("result2 = %d\n", result); |
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237 #endif |
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238 } |
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239 else if (access == PROTpackage && hasPackageAccess(sc, this)) |
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240 { |
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241 result = 1; |
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242 #if LOG |
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243 printf("result3 = %d\n", result); |
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244 #endif |
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245 } |
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246 else |
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247 { |
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248 result = accessCheckX(smember, f, this, cdscope); |
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249 #if LOG |
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250 printf("result4 = %d\n", result); |
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251 #endif |
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252 } |
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253 if (!result) |
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254 { |
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255 error(loc, "member %s is not accessible", smember->toChars()); |
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256 halt(); |
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257 } |
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258 } |
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259 |
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260 /**************************************** |
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261 * Determine if this is the same or friend of cd. |
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262 */ |
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263 |
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264 int AggregateDeclaration::isFriendOf(AggregateDeclaration *cd) |
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265 { |
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266 #if LOG |
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267 printf("AggregateDeclaration::isFriendOf(this = '%s', cd = '%s')\n", toChars(), cd ? cd->toChars() : "null"); |
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268 #endif |
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269 if (this == cd) |
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270 return 1; |
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271 |
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272 // Friends if both are in the same module |
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273 //if (toParent() == cd->toParent()) |
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274 if (cd && getModule() == cd->getModule()) |
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275 { |
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276 #if LOG |
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277 printf("\tin same module\n"); |
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278 #endif |
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279 return 1; |
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280 } |
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281 |
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282 #if LOG |
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283 printf("\tnot friend\n"); |
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284 #endif |
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285 return 0; |
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286 } |
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287 |
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288 /**************************************** |
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289 * Determine if scope sc has package level access to s. |
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290 */ |
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291 |
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292 int hasPackageAccess(Scope *sc, Dsymbol *s) |
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293 { |
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294 #if LOG |
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295 printf("hasPackageAccess(s = '%s', sc = '%p')\n", s->toChars(), sc); |
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296 #endif |
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297 |
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298 for (; s; s = s->parent) |
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299 { |
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300 if (s->isPackage() && !s->isModule()) |
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301 break; |
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302 } |
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303 #if LOG |
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304 if (s) |
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305 printf("\tthis is in package '%s'\n", s->toChars()); |
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306 #endif |
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307 |
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308 if (s && s == sc->module->parent) |
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309 { |
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310 #if LOG |
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311 printf("\ts is in same package as sc\n"); |
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312 #endif |
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313 return 1; |
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314 } |
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315 |
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316 |
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317 #if LOG |
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318 printf("\tno package access\n"); |
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319 #endif |
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320 return 0; |
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321 } |
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322 |
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323 /********************************** |
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324 * Determine if smember has access to private members of this declaration. |
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325 */ |
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326 |
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327 int AggregateDeclaration::hasPrivateAccess(Dsymbol *smember) |
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328 { |
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329 if (smember) |
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330 { AggregateDeclaration *cd = NULL; |
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331 Dsymbol *smemberparent = smember->toParent(); |
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332 if (smemberparent) |
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333 cd = smemberparent->isAggregateDeclaration(); |
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334 |
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335 #if LOG |
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336 printf("AggregateDeclaration::hasPrivateAccess(class %s, member %s)\n", |
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337 toChars(), smember->toChars()); |
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338 #endif |
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339 |
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340 if (this == cd) // smember is a member of this class |
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341 { |
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342 #if LOG |
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343 printf("\tyes 1\n"); |
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344 #endif |
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345 return 1; // so we get private access |
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346 } |
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347 |
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348 // If both are members of the same module, grant access |
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349 while (1) |
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350 { Dsymbol *sp = smember->toParent(); |
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351 if (sp->isFuncDeclaration() && smember->isFuncDeclaration()) |
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352 smember = sp; |
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353 else |
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354 break; |
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355 } |
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356 if (!cd && toParent() == smember->toParent()) |
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357 { |
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358 #if LOG |
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359 printf("\tyes 2\n"); |
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360 #endif |
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361 return 1; |
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362 } |
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363 if (!cd && getModule() == smember->getModule()) |
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364 { |
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365 #if LOG |
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366 printf("\tyes 3\n"); |
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367 #endif |
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368 return 1; |
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369 } |
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370 } |
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371 #if LOG |
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372 printf("\tno\n"); |
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373 #endif |
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374 return 0; |
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375 } |
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376 |
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377 /**************************************** |
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378 * Check access to d for expression e.d |
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379 */ |
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380 |
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381 void accessCheck(Loc loc, Scope *sc, Expression *e, Declaration *d) |
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382 { |
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383 #if LOG |
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384 if (e) |
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385 { printf("accessCheck(%s . %s)\n", e->toChars(), d->toChars()); |
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386 printf("\te->type = %s\n", e->type->toChars()); |
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387 } |
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388 else |
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389 { |
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390 //printf("accessCheck(%s)\n", d->toChars()); |
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391 } |
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392 #endif |
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393 if (!e) |
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394 { |
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395 if (d->prot() == PROTprivate && d->getModule() != sc->module || |
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396 d->prot() == PROTpackage && !hasPackageAccess(sc, d)) |
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397 |
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398 error(loc, "%s %s.%s is not accessible from %s", |
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399 d->kind(), d->getModule()->toChars(), d->toChars(), sc->module->toChars()); |
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400 } |
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401 else if (e->type->ty == Tclass) |
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402 { // Do access check |
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403 ClassDeclaration *cd; |
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404 |
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405 cd = (ClassDeclaration *)(((TypeClass *)e->type)->sym); |
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406 #if 1 |
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407 if (e->op == TOKsuper) |
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408 { ClassDeclaration *cd2; |
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409 |
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410 cd2 = sc->func->toParent()->isClassDeclaration(); |
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411 if (cd2) |
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412 cd = cd2; |
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413 } |
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414 #endif |
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415 cd->accessCheck(loc, sc, d); |
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416 } |
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417 else if (e->type->ty == Tstruct) |
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418 { // Do access check |
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419 StructDeclaration *cd; |
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420 |
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421 cd = (StructDeclaration *)(((TypeStruct *)e->type)->sym); |
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422 cd->accessCheck(loc, sc, d); |
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423 } |
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424 } |