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authordkf <donal.k.fellows@manchester.ac.uk>2005-07-15 15:09:31 (GMT)
committerdkf <donal.k.fellows@manchester.ac.uk>2005-07-15 15:09:31 (GMT)
commit3b6daa4ddbfd2ba80a0c6b58b5736ede11562262 (patch)
tree05fd7c0d2d23a2b791bf8d25f3708815d319a6d2 /generic
parent1a08d59aef56af9569beb42d001c19a8e047a287 (diff)
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More tidying up
Diffstat (limited to 'generic')
-rw-r--r--generic/tclResolve.c394
1 files changed, 190 insertions, 204 deletions
diff --git a/generic/tclResolve.c b/generic/tclResolve.c
index 49c21ca..e61e49d 100644
--- a/generic/tclResolve.c
+++ b/generic/tclResolve.c
@@ -1,113 +1,110 @@
/*
* tclResolve.c --
*
- * Contains hooks for customized command/variable name resolution
- * schemes. These hooks allow extensions like [incr Tcl] to add
- * their own name resolution rules to the Tcl language. Rules can
- * be applied to a particular namespace, to the interpreter as a
- * whole, or both.
+ * Contains hooks for customized command/variable name resolution
+ * schemes. These hooks allow extensions like [incr Tcl] to add their own
+ * name resolution rules to the Tcl language. Rules can be applied to a
+ * particular namespace, to the interpreter as a whole, or both.
*
* Copyright (c) 1998 Lucent Technologies, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclResolve.c,v 1.5 2005/05/30 00:04:48 dkf Exp $
+ * RCS: @(#) $Id: tclResolve.c,v 1.6 2005/07/15 15:09:31 dkf Exp $
*/
#include "tclInt.h"
/*
- * Declarations for procedures local to this file:
+ * Declarations for functions local to this file:
*/
static void BumpCmdRefEpochs _ANSI_ARGS_((Namespace *nsPtr));
-
/*
*----------------------------------------------------------------------
*
* Tcl_AddInterpResolvers --
*
- * Adds a set of command/variable resolution procedures to an
- * interpreter. These procedures are consulted when commands
- * are resolved in Tcl_FindCommand, and when variables are
- * resolved in TclLookupVar and LookupCompiledLocal. Each
- * namespace may also have its own set of resolution procedures
- * which take precedence over those for the interpreter.
+ * Adds a set of command/variable resolution functions to an interpreter.
+ * These functions are consulted when commands are resolved in
+ * Tcl_FindCommand, and when variables are resolved in TclLookupVar and
+ * LookupCompiledLocal. Each namespace may also have its own set of
+ * resolution functions which take precedence over those for the
+ * interpreter.
*
- * When a name is resolved, it is handled as follows. First,
- * the name is passed to the resolution procedures for the
- * namespace. If not resolved, the name is passed to each of
- * the resolution procedures added to the interpreter. Finally,
- * if still not resolved, the name is handled using the default
- * Tcl rules for name resolution.
+ * When a name is resolved, it is handled as follows. First, the name is
+ * passed to the resolution functions for the namespace. If not resolved,
+ * the name is passed to each of the resolution functions added to the
+ * interpreter. Finally, if still not resolved, the name is handled using
+ * the default Tcl rules for name resolution.
*
* Results:
- * Returns pointers to the current name resolution procedures
- * in the cmdProcPtr, varProcPtr and compiledVarProcPtr
- * arguments.
+ * Returns pointers to the current name resolution functions in the
+ * cmdProcPtr, varProcPtr and compiledVarProcPtr arguments.
*
* Side effects:
- * If a compiledVarProc is specified, this procedure bumps the
- * compileEpoch for the interpreter, forcing all code to be
- * recompiled. If a cmdProc is specified, this procedure bumps
- * the cmdRefEpoch in all namespaces, forcing commands to be
- * resolved again using the new rules.
+ * If a compiledVarProc is specified, this function bumps the
+ * compileEpoch for the interpreter, forcing all code to be recompiled.
+ * If a cmdProc is specified, this function bumps the cmdRefEpoch in all
+ * namespaces, forcing commands to be resolved again using the new rules.
*
*----------------------------------------------------------------------
*/
void
Tcl_AddInterpResolvers(interp, name, cmdProc, varProc, compiledVarProc)
-
Tcl_Interp *interp; /* Interpreter whose name resolution
* rules are being modified. */
CONST char *name; /* Name of this resolution scheme. */
- Tcl_ResolveCmdProc *cmdProc; /* New procedure for command
- * resolution */
- Tcl_ResolveVarProc *varProc; /* Procedure for variable resolution
- * at runtime */
+ Tcl_ResolveCmdProc *cmdProc; /* New function for command
+ * resolution. */
+ Tcl_ResolveVarProc *varProc; /* Function for variable resolution at
+ * runtime. */
Tcl_ResolveCompiledVarProc *compiledVarProc;
- /* Procedure for variable resolution
- * at compile time. */
+ /* Function for variable resolution at
+ * compile time. */
{
- Interp *iPtr = (Interp*)interp;
+ Interp *iPtr = (Interp *) interp;
ResolverScheme *resPtr;
/*
- * Since we're adding a new name resolution scheme, we must force
- * all code to be recompiled to use the new scheme. If there
- * are new compiled variable resolution rules, bump the compiler
- * epoch to invalidate compiled code. If there are new command
- * resolution rules, bump the cmdRefEpoch in all namespaces.
+ * Since we're adding a new name resolution scheme, we must force all code
+ * to be recompiled to use the new scheme. If there are new compiled
+ * variable resolution rules, bump the compiler epoch to invalidate
+ * compiled code. If there are new command resolution rules, bump the
+ * cmdRefEpoch in all namespaces.
*/
+
if (compiledVarProc) {
- iPtr->compileEpoch++;
+ iPtr->compileEpoch++;
}
if (cmdProc) {
- BumpCmdRefEpochs(iPtr->globalNsPtr);
+ BumpCmdRefEpochs(iPtr->globalNsPtr);
}
/*
- * Look for an existing scheme with the given name. If found,
- * then replace its rules.
+ * Look for an existing scheme with the given name. If found, then replace
+ * its rules.
*/
- for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) {
- if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
- resPtr->cmdResProc = cmdProc;
- resPtr->varResProc = varProc;
- resPtr->compiledVarResProc = compiledVarProc;
- return;
- }
+
+ for (resPtr=iPtr->resolverPtr ; resPtr!=NULL ; resPtr=resPtr->nextPtr) {
+ if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
+ resPtr->cmdResProc = cmdProc;
+ resPtr->varResProc = varProc;
+ resPtr->compiledVarResProc = compiledVarProc;
+ return;
+ }
}
/*
- * Otherwise, this is a new scheme. Add it to the FRONT
- * of the linked list, so that it overrides existing schemes.
+ * Otherwise, this is a new scheme. Add it to the FRONT of the linked
+ * list, so that it overrides existing schemes.
*/
+
resPtr = (ResolverScheme *) ckalloc(sizeof(ResolverScheme));
- resPtr->name = (char*)ckalloc((unsigned)(strlen(name)+1));
+ resPtr->name = (char *) ckalloc((unsigned)(strlen(name) + 1));
strcpy(resPtr->name, name);
resPtr->cmdResProc = cmdProc;
resPtr->varResProc = varProc;
@@ -121,15 +118,14 @@ Tcl_AddInterpResolvers(interp, name, cmdProc, varProc, compiledVarProc)
*
* Tcl_GetInterpResolvers --
*
- * Looks for a set of command/variable resolution procedures with
- * the given name in an interpreter. These procedures are
- * registered by calling Tcl_AddInterpResolvers.
+ * Looks for a set of command/variable resolution functions with the
+ * given name in an interpreter. These functions are registered by
+ * calling Tcl_AddInterpResolvers.
*
* Results:
- * If the name is recognized, this procedure returns non-zero,
- * along with pointers to the name resolution procedures in
- * the Tcl_ResolverInfo structure. If the name is not recognized,
- * this procedure returns zero.
+ * If the name is recognized, this function returns non-zero, along with
+ * pointers to the name resolution functions in the Tcl_ResolverInfo
+ * structure. If the name is not recognized, this function returns zero.
*
* Side effects:
* None.
@@ -139,27 +135,27 @@ Tcl_AddInterpResolvers(interp, name, cmdProc, varProc, compiledVarProc)
int
Tcl_GetInterpResolvers(interp, name, resInfoPtr)
-
Tcl_Interp *interp; /* Interpreter whose name resolution
* rules are being queried. */
- CONST char *name; /* Look for a scheme with this name. */
- Tcl_ResolverInfo *resInfoPtr; /* Returns pointers to the procedures,
+ CONST char *name; /* Look for a scheme with this name. */
+ Tcl_ResolverInfo *resInfoPtr; /* Returns pointers to the functions,
* if found */
{
- Interp *iPtr = (Interp*)interp;
+ Interp *iPtr = (Interp *) interp;
ResolverScheme *resPtr;
/*
- * Look for an existing scheme with the given name. If found,
- * then return pointers to its procedures.
+ * Look for an existing scheme with the given name. If found, then return
+ * pointers to its functions.
*/
- for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) {
- if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
+
+ for (resPtr=iPtr->resolverPtr ; resPtr!=NULL ; resPtr=resPtr->nextPtr) {
+ if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
resInfoPtr->cmdResProc = resPtr->cmdResProc;
resInfoPtr->varResProc = resPtr->varResProc;
resInfoPtr->compiledVarResProc = resPtr->compiledVarResProc;
- return 1;
- }
+ return 1;
+ }
}
return 0;
@@ -170,68 +166,69 @@ Tcl_GetInterpResolvers(interp, name, resInfoPtr)
*
* Tcl_RemoveInterpResolvers --
*
- * Removes a set of command/variable resolution procedures
- * previously added by Tcl_AddInterpResolvers. The next time
- * a command/variable name is resolved, these procedures
- * won't be consulted.
+ * Removes a set of command/variable resolution functions previously
+ * added by Tcl_AddInterpResolvers. The next time a command/variable name
+ * is resolved, these functions won't be consulted.
*
* Results:
- * Returns non-zero if the name was recognized and the
- * resolution scheme was deleted. Returns zero otherwise.
+ * Returns non-zero if the name was recognized and the resolution scheme
+ * was deleted. Returns zero otherwise.
*
* Side effects:
- * If a scheme with a compiledVarProc was deleted, this procedure
- * bumps the compileEpoch for the interpreter, forcing all code
- * to be recompiled. If a scheme with a cmdProc was deleted,
- * this procedure bumps the cmdRefEpoch in all namespaces,
- * forcing commands to be resolved again using the new rules.
+ * If a scheme with a compiledVarProc was deleted, this function bumps
+ * the compileEpoch for the interpreter, forcing all code to be
+ * recompiled. If a scheme with a cmdProc was deleted, this function
+ * bumps the cmdRefEpoch in all namespaces, forcing commands to be
+ * resolved again using the new rules.
*
*----------------------------------------------------------------------
*/
int
Tcl_RemoveInterpResolvers(interp, name)
-
Tcl_Interp *interp; /* Interpreter whose name resolution
* rules are being modified. */
- CONST char *name; /* Name of the scheme to be removed. */
+ CONST char *name; /* Name of the scheme to be removed. */
{
- Interp *iPtr = (Interp*)interp;
+ Interp *iPtr = (Interp *) interp;
ResolverScheme **prevPtrPtr, *resPtr;
/*
- * Look for an existing scheme with the given name.
+ * Look for an existing scheme with the given name.
*/
+
prevPtrPtr = &iPtr->resolverPtr;
- for (resPtr = iPtr->resolverPtr; resPtr != NULL; resPtr = resPtr->nextPtr) {
- if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
- break;
- }
- prevPtrPtr = &resPtr->nextPtr;
+ for (resPtr=iPtr->resolverPtr ; resPtr!=NULL ; resPtr=resPtr->nextPtr) {
+ if (*name == *resPtr->name && strcmp(name, resPtr->name) == 0) {
+ break;
+ }
+ prevPtrPtr = &resPtr->nextPtr;
}
/*
- * If we found the scheme, delete it.
+ * If we found the scheme, delete it.
*/
+
if (resPtr) {
- /*
- * If we're deleting a scheme with compiled variable resolution
- * rules, bump the compiler epoch to invalidate compiled code.
- * If we're deleting a scheme with command resolution rules,
- * bump the cmdRefEpoch in all namespaces.
- */
- if (resPtr->compiledVarResProc) {
- iPtr->compileEpoch++;
- }
- if (resPtr->cmdResProc) {
- BumpCmdRefEpochs(iPtr->globalNsPtr);
- }
-
- *prevPtrPtr = resPtr->nextPtr;
- ckfree(resPtr->name);
- ckfree((char *) resPtr);
-
- return 1;
+ /*
+ * If we're deleting a scheme with compiled variable resolution rules,
+ * bump the compiler epoch to invalidate compiled code. If we're
+ * deleting a scheme with command resolution rules, bump the
+ * cmdRefEpoch in all namespaces.
+ */
+
+ if (resPtr->compiledVarResProc) {
+ iPtr->compileEpoch++;
+ }
+ if (resPtr->cmdResProc) {
+ BumpCmdRefEpochs(iPtr->globalNsPtr);
+ }
+
+ *prevPtrPtr = resPtr->nextPtr;
+ ckfree(resPtr->name);
+ ckfree((char *) resPtr);
+
+ return 1;
}
return 0;
}
@@ -241,17 +238,17 @@ Tcl_RemoveInterpResolvers(interp, name)
*
* BumpCmdRefEpochs --
*
- * This procedure is used to bump the cmdRefEpoch counters in
- * the specified namespace and all of its child namespaces.
- * It is used whenever name resolution schemes are added/removed
- * from an interpreter, to invalidate all command references.
+ * This function is used to bump the cmdRefEpoch counters in the
+ * specified namespace and all of its child namespaces. It is used
+ * whenever name resolution schemes are added/removed from an
+ * interpreter, to invalidate all command references.
*
* Results:
* None.
*
* Side effects:
- * Bumps the cmdRefEpoch in the specified namespace and its
- * children, recursively.
+ * Bumps the cmdRefEpoch in the specified namespace and its children,
+ * recursively.
*
*----------------------------------------------------------------------
*/
@@ -262,16 +259,13 @@ BumpCmdRefEpochs(nsPtr)
{
Tcl_HashEntry *entry;
Tcl_HashSearch search;
- Namespace *childNsPtr;
nsPtr->cmdRefEpoch++;
for (entry = Tcl_FirstHashEntry(&nsPtr->childTable, &search);
- entry != NULL;
- entry = Tcl_NextHashEntry(&search)) {
-
- childNsPtr = (Namespace *) Tcl_GetHashValue(entry);
- BumpCmdRefEpochs(childNsPtr);
+ entry != NULL; entry = Tcl_NextHashEntry(&search)) {
+ Namespace *childNsPtr = (Namespace *) Tcl_GetHashValue(entry);
+ BumpCmdRefEpochs(childNsPtr);
}
TclInvalidateNsPath(nsPtr);
}
@@ -281,66 +275,61 @@ BumpCmdRefEpochs(nsPtr)
*
* Tcl_SetNamespaceResolvers --
*
- * Sets the command/variable resolution procedures for a namespace,
- * thereby changing the way that command/variable names are
- * interpreted. This allows extension writers to support different
- * name resolution schemes, such as those for object-oriented
- * packages.
- *
- * Command resolution is handled by a procedure of the following
- * type:
- *
- * typedef int (Tcl_ResolveCmdProc) _ANSI_ARGS_((
- * Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context,
- * int flags, Tcl_Command *rPtr));
- *
- * Whenever a command is executed or Tcl_FindCommand is invoked
- * within the namespace, this procedure is called to resolve the
- * command name. If this procedure is able to resolve the name,
- * it should return the status code TCL_OK, along with the
- * corresponding Tcl_Command in the rPtr argument. Otherwise,
- * the procedure can return TCL_CONTINUE, and the command will
- * be treated under the usual name resolution rules. Or, it can
- * return TCL_ERROR, and the command will be considered invalid.
- *
- * Variable resolution is handled by two procedures. The first
- * is called whenever a variable needs to be resolved at compile
- * time:
- *
- * typedef int (Tcl_ResolveCompiledVarProc) _ANSI_ARGS_((
- * Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context,
- * Tcl_ResolvedVarInfo *rPtr));
- *
- * If this procedure is able to resolve the name, it should return
- * the status code TCL_OK, along with variable resolution info in
- * the rPtr argument; this info will be used to set up compiled
- * locals in the call frame at runtime. The procedure may also
- * return TCL_CONTINUE, and the variable will be treated under
- * the usual name resolution rules. Or, it can return TCL_ERROR,
- * and the variable will be considered invalid.
- *
- * Another procedure is used whenever a variable needs to be
- * resolved at runtime but it is not recognized as a compiled local.
- * (For example, the variable may be requested via
- * Tcl_FindNamespaceVar.) This procedure has the following type:
- *
- * typedef int (Tcl_ResolveVarProc) _ANSI_ARGS_((
- * Tcl_Interp* interp, CONST char* name, Tcl_Namespace *context,
- * int flags, Tcl_Var *rPtr));
- *
- * This procedure is quite similar to the compile-time version.
- * It returns the same status codes, but if variable resolution
- * succeeds, this procedure returns a Tcl_Var directly via the
- * rPtr argument.
+ * Sets the command/variable resolution functions for a namespace,
+ * thereby changing the way that command/variable names are interpreted.
+ * This allows extension writers to support different name resolution
+ * schemes, such as those for object-oriented packages.
+ *
+ * Command resolution is handled by a function of the following type:
+ *
+ * typedef int (*Tcl_ResolveCmdProc)(Tcl_Interp *interp,
+ * CONST char *name, Tcl_Namespace *context,
+ * int flags, Tcl_Command *rPtr);
+ *
+ * Whenever a command is executed or Tcl_FindCommand is invoked within
+ * the namespace, this function is called to resolve the command name.
+ * If this function is able to resolve the name, it should return the
+ * status code TCL_OK, along with the corresponding Tcl_Command in the
+ * rPtr argument. Otherwise, the function can return TCL_CONTINUE, and
+ * the command will be treated under the usual name resolution rules.
+ * Or, it can return TCL_ERROR, and the command will be considered
+ * invalid.
+ *
+ * Variable resolution is handled by two functions. The first is called
+ * whenever a variable needs to be resolved at compile time:
+ *
+ * typedef int (*Tcl_ResolveCompiledVarProc)(Tcl_Interp *interp,
+ * CONST char *name, Tcl_Namespace *context,
+ * Tcl_ResolvedVarInfo *rPtr);
+ *
+ * If this function is able to resolve the name, it should return the
+ * status code TCL_OK, along with variable resolution info in the rPtr
+ * argument; this info will be used to set up compiled locals in the call
+ * frame at runtime. The function may also return TCL_CONTINUE, and the
+ * variable will be treated under the usual name resolution rules. Or, it
+ * can return TCL_ERROR, and the variable will be considered invalid.
+ *
+ * Another function is used whenever a variable needs to be resolved at
+ * runtime but it is not recognized as a compiled local. (For example,
+ * the variable may be requested via Tcl_FindNamespaceVar.) This function
+ * has the following type:
+ *
+ * typedef int (*Tcl_ResolveVarProc)(Tcl_Interp *interp,
+ * CONST char *name, Tcl_Namespace *context,
+ * int flags, Tcl_Var *rPtr);
+ *
+ * This function is quite similar to the compile-time version. It returns
+ * the same status codes, but if variable resolution succeeds, this
+ * function returns a Tcl_Var directly via the rPtr argument.
*
* Results:
* Nothing.
*
* Side effects:
- * Bumps the command epoch counter for the namespace, invalidating
- * all command references in that namespace. Also bumps the
- * resolver epoch counter for the namespace, forcing all code
- * in the namespace to be recompiled.
+ * Bumps the command epoch counter for the namespace, invalidating all
+ * command references in that namespace. Also bumps the resolver epoch
+ * counter for the namespace, forcing all code in the namespace to be
+ * recompiled.
*
*----------------------------------------------------------------------
*/
@@ -349,20 +338,21 @@ void
Tcl_SetNamespaceResolvers(namespacePtr, cmdProc, varProc, compiledVarProc)
Tcl_Namespace *namespacePtr; /* Namespace whose resolution rules
* are being modified. */
- Tcl_ResolveCmdProc *cmdProc; /* Procedure for command resolution */
- Tcl_ResolveVarProc *varProc; /* Procedure for variable resolution
- * at runtime */
+ Tcl_ResolveCmdProc *cmdProc; /* Function for command resolution */
+ Tcl_ResolveVarProc *varProc; /* Function for variable resolution at
+ * run-time */
Tcl_ResolveCompiledVarProc *compiledVarProc;
- /* Procedure for variable resolution
- * at compile time. */
+ /* Function for variable resolution at
+ * compile time. */
{
- Namespace *nsPtr = (Namespace*)namespacePtr;
+ Namespace *nsPtr = (Namespace *) namespacePtr;
/*
- * Plug in the new command resolver, and bump the epoch counters
- * so that all code will have to be recompiled and all commands
- * will have to be resolved again using the new policy.
+ * Plug in the new command resolver, and bump the epoch counters so that
+ * all code will have to be recompiled and all commands will have to be
+ * resolved again using the new policy.
*/
+
nsPtr->cmdResProc = cmdProc;
nsPtr->varResProc = varProc;
nsPtr->compiledVarResProc = compiledVarProc;
@@ -377,17 +367,15 @@ Tcl_SetNamespaceResolvers(namespacePtr, cmdProc, varProc, compiledVarProc)
*
* Tcl_GetNamespaceResolvers --
*
- * Returns the current command/variable resolution procedures
- * for a namespace. By default, these procedures are NULL.
- * New procedures can be installed by calling
- * Tcl_SetNamespaceResolvers, to provide new name resolution
- * rules.
+ * Returns the current command/variable resolution functions for a
+ * namespace. By default, these functions are NULL. New functions can be
+ * installed by calling Tcl_SetNamespaceResolvers, to provide new name
+ * resolution rules.
*
* Results:
- * Returns non-zero if any name resolution procedures have been
- * assigned to this namespace; also returns pointers to the
- * procedures in the Tcl_ResolverInfo structure. Returns zero
- * otherwise.
+ * Returns non-zero if any name resolution functions have been assigned
+ * to this namespace; also returns pointers to the functions in the
+ * Tcl_ResolverInfo structure. Returns zero otherwise.
*
* Side effects:
* None.
@@ -397,22 +385,20 @@ Tcl_SetNamespaceResolvers(namespacePtr, cmdProc, varProc, compiledVarProc)
int
Tcl_GetNamespaceResolvers(namespacePtr, resInfoPtr)
-
Tcl_Namespace *namespacePtr; /* Namespace whose resolution rules
* are being modified. */
- Tcl_ResolverInfo *resInfoPtr; /* Returns: pointers for all
- * name resolution procedures
- * assigned to this namespace. */
+ Tcl_ResolverInfo *resInfoPtr; /* Returns: pointers for all name
+ * resolution functions assigned to
+ * this namespace. */
{
- Namespace *nsPtr = (Namespace*)namespacePtr;
+ Namespace *nsPtr = (Namespace *) namespacePtr;
resInfoPtr->cmdResProc = nsPtr->cmdResProc;
resInfoPtr->varResProc = nsPtr->varResProc;
resInfoPtr->compiledVarResProc = nsPtr->compiledVarResProc;
- if (nsPtr->cmdResProc != NULL ||
- nsPtr->varResProc != NULL ||
- nsPtr->compiledVarResProc != NULL) {
+ if (nsPtr->cmdResProc != NULL || nsPtr->varResProc != NULL ||
+ nsPtr->compiledVarResProc != NULL) {
return 1;
}
return 0;