author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 16:57:14 +0300 | |
branch | RCL_3 |
changeset 23 | 26645d81f48d |
parent 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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/* |
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* tclResolve.c -- |
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* |
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* Contains hooks for customized command/variable name resolution |
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* schemes. These hooks allow extensions like [incr Tcl] to add |
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* their own name resolution rules to the Tcl language. Rules can |
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* be applied to a particular namespace, to the interpreter as a |
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* whole, or both. |
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* |
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* Copyright (c) 1998 Lucent Technologies, Inc. |
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* |
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* See the file "license.terms" for information on usage and redistribution |
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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* |
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* RCS: @(#) $Id: tclResolve.c,v 1.4 2002/01/25 22:01:32 dgp Exp $ |
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*/ |
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|
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#include "tclInt.h" |
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|
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/* |
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* Declarations for procedures local to this file: |
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*/ |
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static void BumpCmdRefEpochs _ANSI_ARGS_((Namespace *nsPtr)); |
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/* |
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*---------------------------------------------------------------------- |
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* |
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* Tcl_AddInterpResolvers -- |
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* |
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* Adds a set of command/variable resolution procedures to an |
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* interpreter. These procedures are consulted when commands |
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* are resolved in Tcl_FindCommand, and when variables are |
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* resolved in TclLookupVar and LookupCompiledLocal. Each |
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* namespace may also have its own set of resolution procedures |
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* which take precedence over those for the interpreter. |
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* |
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* When a name is resolved, it is handled as follows. First, |
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* the name is passed to the resolution procedures for the |
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* namespace. If not resolved, the name is passed to each of |
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* the resolution procedures added to the interpreter. Finally, |
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* if still not resolved, the name is handled using the default |
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* Tcl rules for name resolution. |
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* |
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* Results: |
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* Returns pointers to the current name resolution procedures |
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* in the cmdProcPtr, varProcPtr and compiledVarProcPtr |
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* arguments. |
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* |
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* Side effects: |
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* If a compiledVarProc is specified, this procedure bumps the |
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* compileEpoch for the interpreter, forcing all code to be |
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* recompiled. If a cmdProc is specified, this procedure bumps |
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* the cmdRefEpoch in all namespaces, forcing commands to be |
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* resolved again using the new rules. |
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* |
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*---------------------------------------------------------------------- |
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*/ |
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void |
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Tcl_AddInterpResolvers(interp, name, cmdProc, varProc, compiledVarProc) |
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Tcl_Interp *interp; /* Interpreter whose name resolution |
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* rules are being modified. */ |
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CONST char *name; /* Name of this resolution scheme. */ |
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Tcl_ResolveCmdProc *cmdProc; /* New procedure for command |
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* resolution */ |
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Tcl_ResolveVarProc *varProc; /* Procedure for variable resolution |
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* at runtime */ |
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Tcl_ResolveCompiledVarProc *compiledVarProc; |
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/* Procedure for variable resolution |
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* at compile time. */ |
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{ |
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Interp *iPtr = (Interp*)interp; |
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ResolverScheme *resPtr; |
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|
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/* |
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* Since we're adding a new name resolution scheme, we must force |
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* all code to be recompiled to use the new scheme. If there |
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* are new compiled variable resolution rules, bump the compiler |
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* epoch to invalidate compiled code. If there are new command |
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* resolution rules, bump the cmdRefEpoch in all namespaces. |
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*/ |
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if (compiledVarProc) { |
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iPtr->compileEpoch++; |
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} |
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if (cmdProc) { |
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BumpCmdRefEpochs(iPtr->globalNsPtr); |
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} |
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/* |
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* Look for an existing scheme with the given name. If found, |
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* then replace its rules. |
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*/ |
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for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) { |
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if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) { |
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resPtr->cmdResProc = cmdProc; |
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resPtr->varResProc = varProc; |
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resPtr->compiledVarResProc = compiledVarProc; |
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return; |
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} |
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103 |
} |
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104 |
|
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105 |
/* |
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106 |
* Otherwise, this is a new scheme. Add it to the FRONT |
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107 |
* of the linked list, so that it overrides existing schemes. |
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108 |
*/ |
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109 |
resPtr = (ResolverScheme *) ckalloc(sizeof(ResolverScheme)); |
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resPtr->name = (char*)ckalloc((unsigned)(strlen(name)+1)); |
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111 |
strcpy(resPtr->name, name); |
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112 |
resPtr->cmdResProc = cmdProc; |
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113 |
resPtr->varResProc = varProc; |
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114 |
resPtr->compiledVarResProc = compiledVarProc; |
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115 |
resPtr->nextPtr = iPtr->resolverPtr; |
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116 |
iPtr->resolverPtr = resPtr; |
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117 |
} |
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118 |
|
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119 |
/* |
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120 |
*---------------------------------------------------------------------- |
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121 |
* |
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122 |
* Tcl_GetInterpResolvers -- |
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123 |
* |
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* Looks for a set of command/variable resolution procedures with |
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* the given name in an interpreter. These procedures are |
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126 |
* registered by calling Tcl_AddInterpResolvers. |
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127 |
* |
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128 |
* Results: |
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129 |
* If the name is recognized, this procedure returns non-zero, |
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130 |
* along with pointers to the name resolution procedures in |
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131 |
* the Tcl_ResolverInfo structure. If the name is not recognized, |
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132 |
* this procedure returns zero. |
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133 |
* |
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134 |
* Side effects: |
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135 |
* None. |
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136 |
* |
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137 |
*---------------------------------------------------------------------- |
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138 |
*/ |
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139 |
|
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140 |
int |
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141 |
Tcl_GetInterpResolvers(interp, name, resInfoPtr) |
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142 |
|
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143 |
Tcl_Interp *interp; /* Interpreter whose name resolution |
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144 |
* rules are being queried. */ |
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145 |
CONST char *name; /* Look for a scheme with this name. */ |
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146 |
Tcl_ResolverInfo *resInfoPtr; /* Returns pointers to the procedures, |
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147 |
* if found */ |
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148 |
{ |
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149 |
Interp *iPtr = (Interp*)interp; |
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150 |
ResolverScheme *resPtr; |
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151 |
|
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152 |
/* |
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153 |
* Look for an existing scheme with the given name. If found, |
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154 |
* then return pointers to its procedures. |
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155 |
*/ |
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156 |
for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) { |
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157 |
if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) { |
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158 |
resInfoPtr->cmdResProc = resPtr->cmdResProc; |
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159 |
resInfoPtr->varResProc = resPtr->varResProc; |
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160 |
resInfoPtr->compiledVarResProc = resPtr->compiledVarResProc; |
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161 |
return 1; |
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162 |
} |
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163 |
} |
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164 |
|
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165 |
return 0; |
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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 |
* |
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171 |
* Tcl_RemoveInterpResolvers -- |
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172 |
* |
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173 |
* Removes a set of command/variable resolution procedures |
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174 |
* previously added by Tcl_AddInterpResolvers. The next time |
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175 |
* a command/variable name is resolved, these procedures |
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176 |
* won't be consulted. |
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177 |
* |
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178 |
* Results: |
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179 |
* Returns non-zero if the name was recognized and the |
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180 |
* resolution scheme was deleted. Returns zero otherwise. |
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181 |
* |
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182 |
* Side effects: |
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183 |
* If a scheme with a compiledVarProc was deleted, this procedure |
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184 |
* bumps the compileEpoch for the interpreter, forcing all code |
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185 |
* to be recompiled. If a scheme with a cmdProc was deleted, |
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186 |
* this procedure bumps the cmdRefEpoch in all namespaces, |
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187 |
* forcing commands to be resolved again using the new rules. |
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188 |
* |
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189 |
*---------------------------------------------------------------------- |
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190 |
*/ |
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191 |
|
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192 |
int |
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193 |
Tcl_RemoveInterpResolvers(interp, name) |
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194 |
|
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195 |
Tcl_Interp *interp; /* Interpreter whose name resolution |
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196 |
* rules are being modified. */ |
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197 |
CONST char *name; /* Name of the scheme to be removed. */ |
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198 |
{ |
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199 |
Interp *iPtr = (Interp*)interp; |
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200 |
ResolverScheme **prevPtrPtr, *resPtr; |
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|
201 |
|
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202 |
/* |
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203 |
* Look for an existing scheme with the given name. |
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204 |
*/ |
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205 |
prevPtrPtr = &iPtr->resolverPtr; |
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206 |
for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) { |
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if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) { |
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break; |
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209 |
} |
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prevPtrPtr = &resPtr->nextPtr; |
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} |
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212 |
|
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/* |
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* If we found the scheme, delete it. |
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*/ |
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if (resPtr) { |
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/* |
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* If we're deleting a scheme with compiled variable resolution |
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* rules, bump the compiler epoch to invalidate compiled code. |
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* If we're deleting a scheme with command resolution rules, |
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* bump the cmdRefEpoch in all namespaces. |
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*/ |
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if (resPtr->compiledVarResProc) { |
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iPtr->compileEpoch++; |
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} |
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if (resPtr->cmdResProc) { |
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BumpCmdRefEpochs(iPtr->globalNsPtr); |
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} |
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229 |
|
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*prevPtrPtr = resPtr->nextPtr; |
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ckfree(resPtr->name); |
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ckfree((char *) resPtr); |
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233 |
|
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return 1; |
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} |
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return 0; |
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} |
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238 |
|
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239 |
/* |
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240 |
*---------------------------------------------------------------------- |
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241 |
* |
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* BumpCmdRefEpochs -- |
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243 |
* |
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* This procedure is used to bump the cmdRefEpoch counters in |
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* the specified namespace and all of its child namespaces. |
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* It is used whenever name resolution schemes are added/removed |
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* from an interpreter, to invalidate all command references. |
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248 |
* |
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249 |
* Results: |
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250 |
* None. |
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251 |
* |
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* Side effects: |
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* Bumps the cmdRefEpoch in the specified namespace and its |
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* children, recursively. |
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255 |
* |
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256 |
*---------------------------------------------------------------------- |
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257 |
*/ |
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258 |
|
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259 |
static void |
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BumpCmdRefEpochs(nsPtr) |
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Namespace *nsPtr; /* Namespace being modified. */ |
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262 |
{ |
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263 |
Tcl_HashEntry *entry; |
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264 |
Tcl_HashSearch search; |
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Namespace *childNsPtr; |
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266 |
|
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nsPtr->cmdRefEpoch++; |
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268 |
|
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for (entry = Tcl_FirstHashEntry(&nsPtr->childTable, &search); |
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entry != NULL; |
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entry = Tcl_NextHashEntry(&search)) { |
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272 |
|
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childNsPtr = (Namespace *) Tcl_GetHashValue(entry); |
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274 |
BumpCmdRefEpochs(childNsPtr); |
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275 |
} |
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276 |
} |
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277 |
|
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278 |
|
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279 |
/* |
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280 |
*---------------------------------------------------------------------- |
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281 |
* |
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282 |
* Tcl_SetNamespaceResolvers -- |
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283 |
* |
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284 |
* Sets the command/variable resolution procedures for a namespace, |
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* thereby changing the way that command/variable names are |
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286 |
* interpreted. This allows extension writers to support different |
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287 |
* name resolution schemes, such as those for object-oriented |
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288 |
* packages. |
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289 |
* |
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290 |
* Command resolution is handled by a procedure of the following |
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* type: |
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292 |
* |
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* typedef int (Tcl_ResolveCmdProc) _ANSI_ARGS_(( |
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* Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context, |
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* int flags, Tcl_Command *rPtr)); |
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296 |
* |
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* Whenever a command is executed or Tcl_FindCommand is invoked |
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* within the namespace, this procedure is called to resolve the |
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* command name. If this procedure is able to resolve the name, |
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* it should return the status code TCL_OK, along with the |
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* corresponding Tcl_Command in the rPtr argument. Otherwise, |
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* the procedure can return TCL_CONTINUE, and the command will |
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* be treated under the usual name resolution rules. Or, it can |
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* return TCL_ERROR, and the command will be considered invalid. |
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305 |
* |
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306 |
* Variable resolution is handled by two procedures. The first |
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* is called whenever a variable needs to be resolved at compile |
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308 |
* time: |
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309 |
* |
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310 |
* typedef int (Tcl_ResolveCompiledVarProc) _ANSI_ARGS_(( |
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311 |
* Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context, |
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312 |
* Tcl_ResolvedVarInfo *rPtr)); |
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313 |
* |
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|
314 |
* If this procedure is able to resolve the name, it should return |
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|
315 |
* the status code TCL_OK, along with variable resolution info in |
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|
316 |
* the rPtr argument; this info will be used to set up compiled |
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|
317 |
* locals in the call frame at runtime. The procedure may also |
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|
318 |
* return TCL_CONTINUE, and the variable will be treated under |
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319 |
* the usual name resolution rules. Or, it can return TCL_ERROR, |
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320 |
* and the variable will be considered invalid. |
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|
321 |
* |
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|
322 |
* Another procedure is used whenever a variable needs to be |
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|
323 |
* resolved at runtime but it is not recognized as a compiled local. |
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|
324 |
* (For example, the variable may be requested via |
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|
325 |
* Tcl_FindNamespaceVar.) This procedure has the following type: |
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|
326 |
* |
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|
327 |
* typedef int (Tcl_ResolveVarProc) _ANSI_ARGS_(( |
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328 |
* Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context, |
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329 |
* int flags, Tcl_Var *rPtr)); |
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330 |
* |
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|
331 |
* This procedure is quite similar to the compile-time version. |
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|
332 |
* It returns the same status codes, but if variable resolution |
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|
333 |
* succeeds, this procedure returns a Tcl_Var directly via the |
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|
334 |
* rPtr argument. |
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335 |
* |
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336 |
* Results: |
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337 |
* Nothing. |
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338 |
* |
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339 |
* Side effects: |
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340 |
* Bumps the command epoch counter for the namespace, invalidating |
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|
341 |
* all command references in that namespace. Also bumps the |
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|
342 |
* resolver epoch counter for the namespace, forcing all code |
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343 |
* in the namespace to be recompiled. |
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344 |
* |
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|
345 |
*---------------------------------------------------------------------- |
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346 |
*/ |
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|
347 |
|
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348 |
void |
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349 |
Tcl_SetNamespaceResolvers(namespacePtr, cmdProc, varProc, compiledVarProc) |
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350 |
Tcl_Namespace *namespacePtr; /* Namespace whose resolution rules |
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|
351 |
* are being modified. */ |
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|
352 |
Tcl_ResolveCmdProc *cmdProc; /* Procedure for command resolution */ |
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353 |
Tcl_ResolveVarProc *varProc; /* Procedure for variable resolution |
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354 |
* at runtime */ |
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|
355 |
Tcl_ResolveCompiledVarProc *compiledVarProc; |
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356 |
/* Procedure for variable resolution |
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357 |
* at compile time. */ |
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358 |
{ |
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|
359 |
Namespace *nsPtr = (Namespace*)namespacePtr; |
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|
360 |
|
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361 |
/* |
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|
362 |
* Plug in the new command resolver, and bump the epoch counters |
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363 |
* so that all code will have to be recompiled and all commands |
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364 |
* will have to be resolved again using the new policy. |
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|
365 |
*/ |
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|
366 |
nsPtr->cmdResProc = cmdProc; |
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|
367 |
nsPtr->varResProc = varProc; |
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|
368 |
nsPtr->compiledVarResProc = compiledVarProc; |
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|
369 |
|
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|
370 |
nsPtr->cmdRefEpoch++; |
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|
371 |
nsPtr->resolverEpoch++; |
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|
372 |
} |
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|
373 |
|
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|
374 |
/* |
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|
375 |
*---------------------------------------------------------------------- |
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|
376 |
* |
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|
377 |
* Tcl_GetNamespaceResolvers -- |
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|
378 |
* |
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|
379 |
* Returns the current command/variable resolution procedures |
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380 |
* for a namespace. By default, these procedures are NULL. |
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|
381 |
* New procedures can be installed by calling |
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|
382 |
* Tcl_SetNamespaceResolvers, to provide new name resolution |
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|
383 |
* rules. |
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|
384 |
* |
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|
385 |
* Results: |
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|
386 |
* Returns non-zero if any name resolution procedures have been |
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|
387 |
* assigned to this namespace; also returns pointers to the |
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|
388 |
* procedures in the Tcl_ResolverInfo structure. Returns zero |
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|
389 |
* otherwise. |
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|
390 |
* |
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|
391 |
* Side effects: |
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|
392 |
* None. |
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|
393 |
* |
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|
394 |
*---------------------------------------------------------------------- |
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|
395 |
*/ |
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|
396 |
|
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|
397 |
int |
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|
398 |
Tcl_GetNamespaceResolvers(namespacePtr, resInfoPtr) |
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|
399 |
|
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|
400 |
Tcl_Namespace *namespacePtr; /* Namespace whose resolution rules |
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|
401 |
* are being modified. */ |
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|
402 |
Tcl_ResolverInfo *resInfoPtr; /* Returns: pointers for all |
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|
403 |
* name resolution procedures |
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|
404 |
* assigned to this namespace. */ |
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parents:
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|
405 |
{ |
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|
406 |
Namespace *nsPtr = (Namespace*)namespacePtr; |
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|
407 |
|
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|
408 |
resInfoPtr->cmdResProc = nsPtr->cmdResProc; |
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Revision: 201003
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|
409 |
resInfoPtr->varResProc = nsPtr->varResProc; |
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Revision: 201003
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|
410 |
resInfoPtr->compiledVarResProc = nsPtr->compiledVarResProc; |
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|
411 |
|
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Revision: 201003
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|
412 |
if (nsPtr->cmdResProc != NULL || |
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|
413 |
nsPtr->varResProc != NULL || |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
414 |
nsPtr->compiledVarResProc != NULL) { |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
415 |
return 1; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
416 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
417 |
return 0; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
418 |
} |