/*
* tclEnsemble.c --
*
* Contains support for ensembles (see TIP#112), which provide simple
* mechanism for creating composite commands on top of namespaces.
*
* Copyright (c) 2005-2013 Donal K. Fellows.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#include "tclCompile.h"
/*
* Declarations for functions local to this file:
*/
static inline Tcl_Obj * NewNsObj(Tcl_Namespace *namespacePtr);
static inline int EnsembleUnknownCallback(Tcl_Interp *interp,
EnsembleConfig *ensemblePtr, int objc,
Tcl_Obj *const objv[], Tcl_Obj **prefixObjPtr);
static int NsEnsembleImplementationCmd(ClientData clientData,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static int NsEnsembleImplementationCmdNR(ClientData clientData,
Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
static void BuildEnsembleConfig(EnsembleConfig *ensemblePtr);
static int NsEnsembleStringOrder(const void *strPtr1,
const void *strPtr2);
static void DeleteEnsembleConfig(ClientData clientData);
static void MakeCachedEnsembleCommand(Tcl_Obj *objPtr,
EnsembleConfig *ensemblePtr,
const char *subcmdName, Tcl_Obj *prefixObjPtr);
static void FreeEnsembleCmdRep(Tcl_Obj *objPtr);
static void DupEnsembleCmdRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr);
static void StringOfEnsembleCmdRep(Tcl_Obj *objPtr);
static void CompileToInvokedCommand(Tcl_Interp *interp,
Tcl_Parse *parsePtr, Tcl_Obj *replacements,
Command *cmdPtr, CompileEnv *envPtr);
static int CompileBasicNArgCommand(Tcl_Interp *interp,
Tcl_Parse *parsePtr, Command *cmdPtr,
CompileEnv *envPtr);
/*
* The lists of subcommands and options for the [namespace ensemble] command.
*/
static const char *const ensembleSubcommands[] = {
"configure", "create", "exists", NULL
};
enum EnsSubcmds {
ENS_CONFIG, ENS_CREATE, ENS_EXISTS
};
static const char *const ensembleCreateOptions[] = {
"-command", "-map", "-parameters", "-prefixes", "-subcommands",
"-unknown", NULL
};
enum EnsCreateOpts {
CRT_CMD, CRT_MAP, CRT_PARAM, CRT_PREFIX, CRT_SUBCMDS, CRT_UNKNOWN
};
static const char *const ensembleConfigOptions[] = {
"-map", "-namespace", "-parameters", "-prefixes", "-subcommands",
"-unknown", NULL
};
enum EnsConfigOpts {
CONF_MAP, CONF_NAMESPACE, CONF_PARAM, CONF_PREFIX, CONF_SUBCMDS,
CONF_UNKNOWN
};
/*
* This structure defines a Tcl object type that contains a reference to an
* ensemble subcommand (e.g. the "length" in [string length ab]). It is used
* to cache the mapping between the subcommand itself and the real command
* that implements it.
*/
const Tcl_ObjType tclEnsembleCmdType = {
"ensembleCommand", /* the type's name */
FreeEnsembleCmdRep, /* freeIntRepProc */
DupEnsembleCmdRep, /* dupIntRepProc */
StringOfEnsembleCmdRep, /* updateStringProc */
NULL /* setFromAnyProc */
};
static inline Tcl_Obj *
NewNsObj(
Tcl_Namespace *namespacePtr)
{
register Namespace *nsPtr = (Namespace *) namespacePtr;
if (namespacePtr == TclGetGlobalNamespace(nsPtr->interp)) {
return Tcl_NewStringObj("::", 2);
} else {
return Tcl_NewStringObj(nsPtr->fullName, -1);
}
}
/*
*----------------------------------------------------------------------
*
* TclNamespaceEnsembleCmd --
*
* Invoked to implement the "namespace ensemble" command that creates and
* manipulates ensembles built on top of namespaces. Handles the
* following syntax:
*
* namespace ensemble name ?dictionary?
*
* Results:
* Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
*
* Side effects:
* Creates the ensemble for the namespace if one did not previously
* exist. Alternatively, alters the way that the ensemble's subcommand =>
* implementation prefix is configured.
*
*----------------------------------------------------------------------
*/
int
TclNamespaceEnsembleCmd(
ClientData dummy,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
Tcl_Namespace *namespacePtr;
Namespace *nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
Tcl_Command token;
Tcl_DictSearch search;
Tcl_Obj *listObj;
int index, done;
if (nsPtr == NULL || nsPtr->flags & NS_DYING) {
if (!Tcl_InterpDeleted(interp)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"tried to manipulate ensemble of deleted namespace",
-1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "DEAD", NULL);
}
return TCL_ERROR;
}
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], ensembleSubcommands,
"subcommand", 0, &index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum EnsSubcmds) index) {
case ENS_CREATE: {
const char *name;
int len, allocatedMapFlag = 0;
/*
* Defaults
*/
Tcl_Obj *subcmdObj = NULL;
Tcl_Obj *mapObj = NULL;
int permitPrefix = 1;
Tcl_Obj *unknownObj = NULL;
Tcl_Obj *paramObj = NULL;
/*
* Check that we've got option-value pairs... [Bug 1558654]
*/
if (objc & 1) {
Tcl_WrongNumArgs(interp, 2, objv, "?option value ...?");
return TCL_ERROR;
}
objv += 2;
objc -= 2;
/*
* Work out what name to use for the command to create. If supplied,
* it is either fully specified or relative to the current namespace.
* If not supplied, it is exactly the name of the current namespace.
*/
name = nsPtr->fullName;
/*
* Parse the option list, applying type checks as we go. Note that we
* are not incrementing any reference counts in the objects at this
* stage, so the presence of an option multiple times won't cause any
* memory leaks.
*/
for (; objc>1 ; objc-=2,objv+=2) {
if (Tcl_GetIndexFromObj(interp, objv[0], ensembleCreateOptions,
"option", 0, &index) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
switch ((enum EnsCreateOpts) index) {
case CRT_CMD:
name = TclGetString(objv[1]);
continue;
case CRT_SUBCMDS:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
subcmdObj = (len > 0 ? objv[1] : NULL);
continue;
case CRT_PARAM:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
paramObj = (len > 0 ? objv[1] : NULL);
continue;
case CRT_MAP: {
Tcl_Obj *patchedDict = NULL, *subcmdWordsObj;
/*
* Verify that the map is sensible.
*/
if (Tcl_DictObjFirst(interp, objv[1], &search,
&subcmdWordsObj, &listObj, &done) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (done) {
mapObj = NULL;
continue;
}
do {
Tcl_Obj **listv;
const char *cmd;
if (TclListObjGetElements(interp, listObj, &len,
&listv) != TCL_OK) {
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
if (len < 1) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"ensemble subcommand implementations "
"must be non-empty lists", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
"EMPTY_TARGET", NULL);
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
cmd = TclGetString(listv[0]);
if (!(cmd[0] == ':' && cmd[1] == ':')) {
Tcl_Obj *newList = Tcl_NewListObj(len, listv);
Tcl_Obj *newCmd = NewNsObj((Tcl_Namespace *) nsPtr);
if (nsPtr->parentPtr) {
Tcl_AppendStringsToObj(newCmd, "::", NULL);
}
Tcl_AppendObjToObj(newCmd, listv[0]);
Tcl_ListObjReplace(NULL, newList, 0, 1, 1, &newCmd);
if (patchedDict == NULL) {
patchedDict = Tcl_DuplicateObj(objv[1]);
}
Tcl_DictObjPut(NULL, patchedDict, subcmdWordsObj,
newList);
}
Tcl_DictObjNext(&search, &subcmdWordsObj,&listObj, &done);
} while (!done);
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
mapObj = (patchedDict ? patchedDict : objv[1]);
if (patchedDict) {
allocatedMapFlag = 1;
}
continue;
}
case CRT_PREFIX:
if (Tcl_GetBooleanFromObj(interp, objv[1],
&permitPrefix) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
continue;
case CRT_UNKNOWN:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
unknownObj = (len > 0 ? objv[1] : NULL);
continue;
}
}
/*
* Create the ensemble. Note that this might delete another ensemble
* linked to the same namespace, so we must be careful. However, we
* should be OK because we only link the namespace into the list once
* we've created it (and after any deletions have occurred.)
*/
token = Tcl_CreateEnsemble(interp, name, NULL,
(permitPrefix ? TCL_ENSEMBLE_PREFIX : 0));
Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
Tcl_SetEnsembleMappingDict(interp, token, mapObj);
Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
Tcl_SetEnsembleParameterList(interp, token, paramObj);
/*
* Tricky! Must ensure that the result is not shared (command delete
* traces could have corrupted the pristine object that we started
* with). [Snit test rename-1.5]
*/
Tcl_ResetResult(interp);
Tcl_GetCommandFullName(interp, token, Tcl_GetObjResult(interp));
return TCL_OK;
}
case ENS_EXISTS:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "cmdname");
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
Tcl_FindEnsemble(interp, objv[2], 0) != NULL));
return TCL_OK;
case ENS_CONFIG:
if (objc < 3 || (objc != 4 && !(objc & 1))) {
Tcl_WrongNumArgs(interp, 2, objv,
"cmdname ?-option value ...? ?arg ...?");
return TCL_ERROR;
}
token = Tcl_FindEnsemble(interp, objv[2], TCL_LEAVE_ERR_MSG);
if (token == NULL) {
return TCL_ERROR;
}
if (objc == 4) {
Tcl_Obj *resultObj = NULL; /* silence gcc 4 warning */
if (Tcl_GetIndexFromObj(interp, objv[3], ensembleConfigOptions,
"option", 0, &index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum EnsConfigOpts) index) {
case CONF_SUBCMDS:
Tcl_GetEnsembleSubcommandList(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
case CONF_PARAM:
Tcl_GetEnsembleParameterList(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
case CONF_MAP:
Tcl_GetEnsembleMappingDict(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
case CONF_NAMESPACE:
namespacePtr = NULL; /* silence gcc 4 warning */
Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
Tcl_SetObjResult(interp, NewNsObj(namespacePtr));
break;
case CONF_PREFIX: {
int flags = 0; /* silence gcc 4 warning */
Tcl_GetEnsembleFlags(NULL, token, &flags);
Tcl_SetObjResult(interp,
Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
break;
}
case CONF_UNKNOWN:
Tcl_GetEnsembleUnknownHandler(NULL, token, &resultObj);
if (resultObj != NULL) {
Tcl_SetObjResult(interp, resultObj);
}
break;
}
} else if (objc == 3) {
/*
* Produce list of all information.
*/
Tcl_Obj *resultObj, *tmpObj = NULL; /* silence gcc 4 warning */
int flags = 0; /* silence gcc 4 warning */
TclNewObj(resultObj);
/* -map option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_MAP], -1));
Tcl_GetEnsembleMappingDict(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
/* -namespace option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_NAMESPACE],
-1));
namespacePtr = NULL; /* silence gcc 4 warning */
Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
Tcl_ListObjAppendElement(NULL, resultObj, NewNsObj(namespacePtr));
/* -parameters option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_PARAM], -1));
Tcl_GetEnsembleParameterList(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
/* -prefix option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_PREFIX], -1));
Tcl_GetEnsembleFlags(NULL, token, &flags);
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
/* -subcommands option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_SUBCMDS],-1));
Tcl_GetEnsembleSubcommandList(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
/* -unknown option */
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(ensembleConfigOptions[CONF_UNKNOWN],-1));
Tcl_GetEnsembleUnknownHandler(NULL, token, &tmpObj);
Tcl_ListObjAppendElement(NULL, resultObj,
(tmpObj != NULL) ? tmpObj : Tcl_NewObj());
Tcl_SetObjResult(interp, resultObj);
} else {
int len, allocatedMapFlag = 0;
Tcl_Obj *subcmdObj = NULL, *mapObj = NULL, *paramObj = NULL,
*unknownObj = NULL; /* Defaults, silence gcc 4 warnings */
int permitPrefix, flags = 0; /* silence gcc 4 warning */
Tcl_GetEnsembleSubcommandList(NULL, token, &subcmdObj);
Tcl_GetEnsembleMappingDict(NULL, token, &mapObj);
Tcl_GetEnsembleParameterList(NULL, token, ¶mObj);
Tcl_GetEnsembleUnknownHandler(NULL, token, &unknownObj);
Tcl_GetEnsembleFlags(NULL, token, &flags);
permitPrefix = (flags & TCL_ENSEMBLE_PREFIX) != 0;
objv += 3;
objc -= 3;
/*
* Parse the option list, applying type checks as we go. Note that
* we are not incrementing any reference counts in the objects at
* this stage, so the presence of an option multiple times won't
* cause any memory leaks.
*/
for (; objc>0 ; objc-=2,objv+=2) {
if (Tcl_GetIndexFromObj(interp, objv[0],ensembleConfigOptions,
"option", 0, &index) != TCL_OK) {
freeMapAndError:
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
return TCL_ERROR;
}
switch ((enum EnsConfigOpts) index) {
case CONF_SUBCMDS:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
goto freeMapAndError;
}
subcmdObj = (len > 0 ? objv[1] : NULL);
continue;
case CONF_PARAM:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
goto freeMapAndError;
}
paramObj = (len > 0 ? objv[1] : NULL);
continue;
case CONF_MAP: {
Tcl_Obj *patchedDict = NULL, *subcmdWordsObj, **listv;
const char *cmd;
/*
* Verify that the map is sensible.
*/
if (Tcl_DictObjFirst(interp, objv[1], &search,
&subcmdWordsObj, &listObj, &done) != TCL_OK) {
goto freeMapAndError;
}
if (done) {
mapObj = NULL;
continue;
}
do {
if (TclListObjGetElements(interp, listObj, &len,
&listv) != TCL_OK) {
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
goto freeMapAndError;
}
if (len < 1) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"ensemble subcommand implementations "
"must be non-empty lists", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
"EMPTY_TARGET", NULL);
Tcl_DictObjDone(&search);
if (patchedDict) {
Tcl_DecrRefCount(patchedDict);
}
goto freeMapAndError;
}
cmd = TclGetString(listv[0]);
if (!(cmd[0] == ':' && cmd[1] == ':')) {
Tcl_Obj *newList = Tcl_DuplicateObj(listObj);
Tcl_Obj *newCmd = NewNsObj((Tcl_Namespace*)nsPtr);
if (nsPtr->parentPtr) {
Tcl_AppendStringsToObj(newCmd, "::", NULL);
}
Tcl_AppendObjToObj(newCmd, listv[0]);
Tcl_ListObjReplace(NULL, newList, 0,1, 1,&newCmd);
if (patchedDict == NULL) {
patchedDict = Tcl_DuplicateObj(objv[1]);
}
Tcl_DictObjPut(NULL, patchedDict, subcmdWordsObj,
newList);
}
Tcl_DictObjNext(&search, &subcmdWordsObj, &listObj,
&done);
} while (!done);
if (allocatedMapFlag) {
Tcl_DecrRefCount(mapObj);
}
mapObj = (patchedDict ? patchedDict : objv[1]);
if (patchedDict) {
allocatedMapFlag = 1;
}
continue;
}
case CONF_NAMESPACE:
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"option -namespace is read-only", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "READ_ONLY",
NULL);
goto freeMapAndError;
case CONF_PREFIX:
if (Tcl_GetBooleanFromObj(interp, objv[1],
&permitPrefix) != TCL_OK) {
goto freeMapAndError;
}
continue;
case CONF_UNKNOWN:
if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
goto freeMapAndError;
}
unknownObj = (len > 0 ? objv[1] : NULL);
continue;
}
}
/*
* Update the namespace now that we've finished the parsing stage.
*/
flags = (permitPrefix ? flags|TCL_ENSEMBLE_PREFIX
: flags&~TCL_ENSEMBLE_PREFIX);
Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
Tcl_SetEnsembleMappingDict(interp, token, mapObj);
Tcl_SetEnsembleParameterList(interp, token, paramObj);
Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
Tcl_SetEnsembleFlags(interp, token, flags);
}
return TCL_OK;
default:
Tcl_Panic("unexpected ensemble command");
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_CreateEnsemble --
*
* Create a simple ensemble attached to the given namespace.
*
* Results:
* The token for the command created.
*
* Side effects:
* The ensemble is created and marked for compilation.
*
*----------------------------------------------------------------------
*/
Tcl_Command
Tcl_CreateEnsemble(
Tcl_Interp *interp,
const char *name,
Tcl_Namespace *namespacePtr,
int flags)
{
Namespace *nsPtr = (Namespace *) namespacePtr;
EnsembleConfig *ensemblePtr = ckalloc(sizeof(EnsembleConfig));
Tcl_Obj *nameObj = NULL;
if (nsPtr == NULL) {
nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
}
/*
* Make the name of the ensemble into a fully qualified name. This might
* allocate a temporary object.
*/
if (!(name[0] == ':' && name[1] == ':')) {
nameObj = NewNsObj((Tcl_Namespace *) nsPtr);
if (nsPtr->parentPtr == NULL) {
Tcl_AppendStringsToObj(nameObj, name, NULL);
} else {
Tcl_AppendStringsToObj(nameObj, "::", name, NULL);
}
Tcl_IncrRefCount(nameObj);
name = TclGetString(nameObj);
}
ensemblePtr->nsPtr = nsPtr;
ensemblePtr->epoch = 0;
Tcl_InitHashTable(&ensemblePtr->subcommandTable, TCL_STRING_KEYS);
ensemblePtr->subcommandArrayPtr = NULL;
ensemblePtr->subcmdList = NULL;
ensemblePtr->subcommandDict = NULL;
ensemblePtr->flags = flags;
ensemblePtr->numParameters = 0;
ensemblePtr->parameterList = NULL;
ensemblePtr->unknownHandler = NULL;
ensemblePtr->token = Tcl_NRCreateCommand(interp, name,
NsEnsembleImplementationCmd, NsEnsembleImplementationCmdNR,
ensemblePtr, DeleteEnsembleConfig);
ensemblePtr->next = (EnsembleConfig *) nsPtr->ensembles;
nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr;
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
nsPtr->exportLookupEpoch++;
if (flags & ENSEMBLE_COMPILE) {
((Command *) ensemblePtr->token)->compileProc = TclCompileEnsemble;
}
if (nameObj != NULL) {
TclDecrRefCount(nameObj);
}
return ensemblePtr->token;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleSubcommandList --
*
* Set the subcommand list for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the subcommand list - if non-NULL - is not a list).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleSubcommandList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *subcmdList)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldList;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
return TCL_ERROR;
}
if (subcmdList != NULL) {
int length;
if (TclListObjLength(interp, subcmdList, &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 1) {
subcmdList = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldList = ensemblePtr->subcmdList;
ensemblePtr->subcmdList = subcmdList;
if (subcmdList != NULL) {
Tcl_IncrRefCount(subcmdList);
}
if (oldList != NULL) {
TclDecrRefCount(oldList);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* Special hack to make compiling of [info exists] work when the
* dictionary is modified.
*/
if (cmdPtr->compileProc != NULL) {
((Interp *) interp)->compileEpoch++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleParameterList --
*
* Set the parameter list for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the parameter list - if non-NULL - is not a list).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleParameterList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *paramList)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldList;
int length;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
return TCL_ERROR;
}
if (paramList == NULL) {
length = 0;
} else {
if (TclListObjLength(interp, paramList, &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 1) {
paramList = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldList = ensemblePtr->parameterList;
ensemblePtr->parameterList = paramList;
if (paramList != NULL) {
Tcl_IncrRefCount(paramList);
}
if (oldList != NULL) {
TclDecrRefCount(oldList);
}
ensemblePtr->numParameters = length;
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* Special hack to make compiling of [info exists] work when the
* dictionary is modified.
*/
if (cmdPtr->compileProc != NULL) {
((Interp *) interp)->compileEpoch++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleMappingDict --
*
* Set the mapping dictionary for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the mapping - if non-NULL - is not a dict).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleMappingDict(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *mapDict)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldDict;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
return TCL_ERROR;
}
if (mapDict != NULL) {
int size, done;
Tcl_DictSearch search;
Tcl_Obj *valuePtr;
if (Tcl_DictObjSize(interp, mapDict, &size) != TCL_OK) {
return TCL_ERROR;
}
for (Tcl_DictObjFirst(NULL, mapDict, &search, NULL, &valuePtr, &done);
!done; Tcl_DictObjNext(&search, NULL, &valuePtr, &done)) {
Tcl_Obj *cmdObjPtr;
const char *bytes;
if (Tcl_ListObjIndex(interp, valuePtr, 0, &cmdObjPtr) != TCL_OK) {
Tcl_DictObjDone(&search);
return TCL_ERROR;
}
bytes = TclGetString(cmdObjPtr);
if (bytes[0] != ':' || bytes[1] != ':') {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"ensemble target is not a fully-qualified command",
-1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
"UNQUALIFIED_TARGET", NULL);
Tcl_DictObjDone(&search);
return TCL_ERROR;
}
}
if (size < 1) {
mapDict = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldDict = ensemblePtr->subcommandDict;
ensemblePtr->subcommandDict = mapDict;
if (mapDict != NULL) {
Tcl_IncrRefCount(mapDict);
}
if (oldDict != NULL) {
TclDecrRefCount(oldDict);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* Special hack to make compiling of [info exists] work when the
* dictionary is modified.
*/
if (cmdPtr->compileProc != NULL) {
((Interp *) interp)->compileEpoch++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleUnknownHandler --
*
* Set the unknown handler for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an ensemble
* or the unknown handler - if non-NULL - is not a list).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleUnknownHandler(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj *unknownList)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
Tcl_Obj *oldList;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
return TCL_ERROR;
}
if (unknownList != NULL) {
int length;
if (TclListObjLength(interp, unknownList, &length) != TCL_OK) {
return TCL_ERROR;
}
if (length < 1) {
unknownList = NULL;
}
}
ensemblePtr = cmdPtr->objClientData;
oldList = ensemblePtr->unknownHandler;
ensemblePtr->unknownHandler = unknownList;
if (unknownList != NULL) {
Tcl_IncrRefCount(unknownList);
}
if (oldList != NULL) {
TclDecrRefCount(oldList);
}
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetEnsembleFlags --
*
* Set the flags for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble).
*
* Side effects:
* The ensemble is updated and marked for recompilation.
*
*----------------------------------------------------------------------
*/
int
Tcl_SetEnsembleFlags(
Tcl_Interp *interp,
Tcl_Command token,
int flags)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
int wasCompiled;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
wasCompiled = ensemblePtr->flags & ENSEMBLE_COMPILE;
/*
* This API refuses to set the ENSEMBLE_DEAD flag...
*/
ensemblePtr->flags &= ENSEMBLE_DEAD;
ensemblePtr->flags |= flags & ~ENSEMBLE_DEAD;
/*
* Trigger an eventual recomputation of the ensemble command set. Note
* that this is slightly tricky, as it means that we are not actually
* counting the number of namespace export actions, but it is the simplest
* way to go!
*/
ensemblePtr->nsPtr->exportLookupEpoch++;
/*
* If the ENSEMBLE_COMPILE flag status was changed, install or remove the
* compiler function and bump the interpreter's compilation epoch so that
* bytecode gets regenerated.
*/
if (flags & ENSEMBLE_COMPILE) {
if (!wasCompiled) {
((Command*) ensemblePtr->token)->compileProc = TclCompileEnsemble;
((Interp *) interp)->compileEpoch++;
}
} else {
if (wasCompiled) {
((Command *) ensemblePtr->token)->compileProc = NULL;
((Interp *) interp)->compileEpoch++;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleSubcommandList --
*
* Get the list of subcommands associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The list of subcommands is returned by updating the
* variable pointed to by the last parameter (NULL if this is to be
* derived from the mapping dictionary or the associated namespace's
* exported commands).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleSubcommandList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **subcmdListPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*subcmdListPtr = ensemblePtr->subcmdList;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleParameterList --
*
* Get the list of parameters associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The list of parameters is returned by updating the
* variable pointed to by the last parameter (NULL if there are
* no parameters).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleParameterList(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **paramListPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*paramListPtr = ensemblePtr->parameterList;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleMappingDict --
*
* Get the command mapping dictionary associated with a particular
* ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The mapping dict is returned by updating the variable
* pointed to by the last parameter (NULL if none is installed).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleMappingDict(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **mapDictPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*mapDictPtr = ensemblePtr->subcommandDict;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleUnknownHandler --
*
* Get the unknown handler associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The unknown handler is returned by updating the variable
* pointed to by the last parameter (NULL if no handler is installed).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleUnknownHandler(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Obj **unknownListPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*unknownListPtr = ensemblePtr->unknownHandler;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleFlags --
*
* Get the flags for a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). The flags are returned by updating the variable pointed to
* by the last parameter.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleFlags(
Tcl_Interp *interp,
Tcl_Command token,
int *flagsPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*flagsPtr = ensemblePtr->flags;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_GetEnsembleNamespace --
*
* Get the namespace associated with a particular ensemble.
*
* Results:
* Tcl result code (error if command token does not indicate an
* ensemble). Namespace is returned by updating the variable pointed to
* by the last parameter.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_GetEnsembleNamespace(
Tcl_Interp *interp,
Tcl_Command token,
Tcl_Namespace **namespacePtrPtr)
{
Command *cmdPtr = (Command *) token;
EnsembleConfig *ensemblePtr;
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"command is not an ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
}
return TCL_ERROR;
}
ensemblePtr = cmdPtr->objClientData;
*namespacePtrPtr = (Tcl_Namespace *) ensemblePtr->nsPtr;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FindEnsemble --
*
* Given a command name, get the ensemble token for it, allowing for
* [namespace import]s. [Bug 1017022]
*
* Results:
* The token for the ensemble command with the given name, or NULL if the
* command either does not exist or is not an ensemble (when an error
* message will be written into the interp if thats non-NULL).
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
Tcl_Command
Tcl_FindEnsemble(
Tcl_Interp *interp, /* Where to do the lookup, and where to write
* the errors if TCL_LEAVE_ERR_MSG is set in
* the flags. */
Tcl_Obj *cmdNameObj, /* Name of command to look up. */
int flags) /* Either 0 or TCL_LEAVE_ERR_MSG; other flags
* are probably not useful. */
{
Command *cmdPtr;
cmdPtr = (Command *)
Tcl_FindCommand(interp, TclGetString(cmdNameObj), NULL, flags);
if (cmdPtr == NULL) {
return NULL;
}
if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
/*
* Reuse existing infrastructure for following import link chains
* rather than duplicating it.
*/
cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd){
if (flags & TCL_LEAVE_ERR_MSG) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"\"%s\" is not an ensemble command",
TclGetString(cmdNameObj)));
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
TclGetString(cmdNameObj), NULL);
}
return NULL;
}
}
return (Tcl_Command) cmdPtr;
}
/*
*----------------------------------------------------------------------
*
* Tcl_IsEnsemble --
*
* Simple test for ensemble-hood that takes into account imported
* ensemble commands as well.
*
* Results:
* Boolean value
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
Tcl_IsEnsemble(
Tcl_Command token)
{
Command *cmdPtr = (Command *) token;
if (cmdPtr->objProc == NsEnsembleImplementationCmd) {
return 1;
}
cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd) {
return 0;
}
return 1;
}
/*
*----------------------------------------------------------------------
*
* TclMakeEnsemble --
*
* Create an ensemble from a table of implementation commands. The
* ensemble will be subject to (limited) compilation if any of the
* implementation commands are compilable.
*
* The 'name' parameter may be a single command name or a list if
* creating an ensemble subcommand (see the binary implementation).
*
* Currently, the TCL_ENSEMBLE_PREFIX ensemble flag is only used on
* top-level ensemble commands.
*
* Results:
* Handle for the new ensemble, or NULL on failure.
*
* Side effects:
* May advance the bytecode compilation epoch.
*
*----------------------------------------------------------------------
*/
Tcl_Command
TclMakeEnsemble(
Tcl_Interp *interp,
const char *name, /* The ensemble name (as explained above) */
const EnsembleImplMap map[]) /* The subcommands to create */
{
Tcl_Command ensemble;
Tcl_Namespace *ns;
Tcl_DString buf, hiddenBuf;
const char **nameParts = NULL;
const char *cmdName = NULL;
int i, nameCount = 0, ensembleFlags = 0, hiddenLen;
/*
* Construct the path for the ensemble namespace and create it.
*/
Tcl_DStringInit(&buf);
Tcl_DStringInit(&hiddenBuf);
TclDStringAppendLiteral(&hiddenBuf, "tcl:");
Tcl_DStringAppend(&hiddenBuf, name, -1);
TclDStringAppendLiteral(&hiddenBuf, ":");
hiddenLen = Tcl_DStringLength(&hiddenBuf);
if (name[0] == ':' && name[1] == ':') {
/*
* An absolute name, so use it directly.
*/
cmdName = name;
Tcl_DStringAppend(&buf, name, -1);
ensembleFlags = TCL_ENSEMBLE_PREFIX;
} else {
/*
* Not an absolute name, so do munging of it. Note that this treats a
* multi-word list differently to a single word.
*/
TclDStringAppendLiteral(&buf, "::tcl");
if (Tcl_SplitList(NULL, name, &nameCount, &nameParts) != TCL_OK) {
Tcl_Panic("invalid ensemble name '%s'", name);
}
for (i = 0; i < nameCount; ++i) {
TclDStringAppendLiteral(&buf, "::");
Tcl_DStringAppend(&buf, nameParts[i], -1);
}
}
ns = Tcl_FindNamespace(interp, Tcl_DStringValue(&buf), NULL,
TCL_CREATE_NS_IF_UNKNOWN);
if (!ns) {
Tcl_Panic("unable to find or create %s namespace!",
Tcl_DStringValue(&buf));
}
/*
* Create the named ensemble in the correct namespace
*/
if (cmdName == NULL) {
if (nameCount == 1) {
ensembleFlags = TCL_ENSEMBLE_PREFIX;
cmdName = Tcl_DStringValue(&buf) + 5;
} else {
ns = ns->parentPtr;
cmdName = nameParts[nameCount - 1];
}
}
/*
* Switch on compilation always for core ensembles now that we can do
* nice bytecode things with them. Do it now. Waiting until later will
* just cause pointless epoch bumps.
*/
ensembleFlags |= ENSEMBLE_COMPILE;
ensemble = Tcl_CreateEnsemble(interp, cmdName, ns, ensembleFlags);
/*
* Create the ensemble mapping dictionary and the ensemble command procs.
*/
if (ensemble != NULL) {
Tcl_Obj *mapDict, *fromObj, *toObj;
Command *cmdPtr;
TclDStringAppendLiteral(&buf, "::");
TclNewObj(mapDict);
for (i=0 ; map[i].name != NULL ; i++) {
fromObj = Tcl_NewStringObj(map[i].name, -1);
TclNewStringObj(toObj, Tcl_DStringValue(&buf),
Tcl_DStringLength(&buf));
Tcl_AppendToObj(toObj, map[i].name, -1);
Tcl_DictObjPut(NULL, mapDict, fromObj, toObj);
if (map[i].proc || map[i].nreProc) {
/*
* If the command is unsafe, hide it when we're in a safe
* interpreter. The code to do this is really hokey! It also
* doesn't work properly yet; this function is always
* currently called before the safe-interp flag is set so the
* Tcl_IsSafe check fails.
*/
if (map[i].unsafe && Tcl_IsSafe(interp)) {
cmdPtr = (Command *)
Tcl_NRCreateCommand(interp, "___tmp", map[i].proc,
map[i].nreProc, map[i].clientData, NULL);
Tcl_DStringSetLength(&hiddenBuf, hiddenLen);
if (Tcl_HideCommand(interp, "___tmp",
Tcl_DStringAppend(&hiddenBuf, map[i].name, -1))) {
Tcl_Panic("%s", Tcl_GetString(Tcl_GetObjResult(interp)));
}
} else {
/*
* Not hidden, so just create it. Yay!
*/
cmdPtr = (Command *)
Tcl_NRCreateCommand(interp, TclGetString(toObj),
map[i].proc, map[i].nreProc, map[i].clientData,
NULL);
}
cmdPtr->compileProc = map[i].compileProc;
}
}
Tcl_SetEnsembleMappingDict(interp, ensemble, mapDict);
}
Tcl_DStringFree(&buf);
Tcl_DStringFree(&hiddenBuf);
if (nameParts != NULL) {
ckfree((char *) nameParts);
}
return ensemble;
}
/*
*----------------------------------------------------------------------
*
* NsEnsembleImplementationCmd --
*
* Implements an ensemble of commands (being those exported by a
* namespace other than the global namespace) as a command with the same
* (short) name as the namespace in the parent namespace.
*
* Results:
* A standard Tcl result code. Will be TCL_ERROR if the command is not an
* unambiguous prefix of any command exported by the ensemble's
* namespace.
*
* Side effects:
* Depends on the command within the namespace that gets executed. If the
* ensemble itself returns TCL_ERROR, a descriptive error message will be
* placed in the interpreter's result.
*
*----------------------------------------------------------------------
*/
static int
NsEnsembleImplementationCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
return Tcl_NRCallObjProc(interp, NsEnsembleImplementationCmdNR,
clientData, objc, objv);
}
static int
NsEnsembleImplementationCmdNR(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
EnsembleConfig *ensemblePtr = clientData;
/* The ensemble itself. */
Tcl_Obj *prefixObj; /* An object containing the prefix words of
* the command that implements the
* subcommand. */
Tcl_HashEntry *hPtr; /* Used for efficient lookup of fully
* specified but not yet cached command
* names. */
int reparseCount = 0; /* Number of reparses. */
Tcl_Obj *errorObj; /* Used for building error messages. */
/*
* Must recheck objc, since numParameters might have changed. Cf. test
* namespace-53.9.
*/
restartEnsembleParse:
if (objc < 2 + ensemblePtr->numParameters) {
/*
* We don't have a subcommand argument. Make error message.
*/
Tcl_DString buf; /* Message being built */
Tcl_Obj **elemPtrs; /* Parameter names */
int len; /* Number of parameters to append */
Tcl_DStringInit(&buf);
if (ensemblePtr->parameterList == NULL) {
len = 0;
} else if (TclListObjGetElements(NULL, ensemblePtr->parameterList,
&len, &elemPtrs) != TCL_OK) {
Tcl_Panic("List of ensemble parameters is not a list");
}
for (; len>0; len--,elemPtrs++) {
TclDStringAppendObj(&buf, *elemPtrs);
TclDStringAppendLiteral(&buf, " ");
}
TclDStringAppendLiteral(&buf, "subcommand ?arg ...?");
Tcl_WrongNumArgs(interp, 1, objv, Tcl_DStringValue(&buf));
Tcl_DStringFree(&buf);
return TCL_ERROR;
}
if (ensemblePtr->nsPtr->flags & NS_DYING) {
/*
* Don't know how we got here, but make things give up quickly.
*/
if (!Tcl_InterpDeleted(interp)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"ensemble activated for deleted namespace", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "DEAD", NULL);
}
return TCL_ERROR;
}
/*
* Determine if the table of subcommands is right. If so, we can just look
* up in there and go straight to dispatch.
*/
if (ensemblePtr->epoch == ensemblePtr->nsPtr->exportLookupEpoch) {
/*
* Table of subcommands is still valid; therefore there might be a
* valid cache of discovered information which we can reuse. Do the
* check here, and if we're still valid, we can jump straight to the
* part where we do the invocation of the subcommand.
*/
if (objv[1+ensemblePtr->numParameters]->typePtr==&tclEnsembleCmdType){
EnsembleCmdRep *ensembleCmd = objv[1+ensemblePtr->numParameters]
->internalRep.twoPtrValue.ptr1;
if (ensembleCmd->nsPtr == ensemblePtr->nsPtr &&
ensembleCmd->epoch == ensemblePtr->epoch &&
ensembleCmd->token == ensemblePtr->token) {
prefixObj = ensembleCmd->realPrefixObj;
Tcl_IncrRefCount(prefixObj);
goto runResultingSubcommand;
}
}
} else {
BuildEnsembleConfig(ensemblePtr);
ensemblePtr->epoch = ensemblePtr->nsPtr->exportLookupEpoch;
}
/*
* Look in the hashtable for the subcommand name; this is the fastest way
* of all if there is no cache in operation.
*/
hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable,
TclGetString(objv[1 + ensemblePtr->numParameters]));
if (hPtr != NULL) {
char *fullName = Tcl_GetHashKey(&ensemblePtr->subcommandTable, hPtr);
prefixObj = Tcl_GetHashValue(hPtr);
/*
* Cache for later in the subcommand object.
*/
MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters],
ensemblePtr, fullName, prefixObj);
} else if (!(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX)) {
/*
* Could not map, no prefixing, go to unknown/error handling.
*/
goto unknownOrAmbiguousSubcommand;
} else {
/*
* If we've not already confirmed the command with the hash as part of
* building our export table, we need to scan the sorted array for
* matches.
*/
const char *subcmdName; /* Name of the subcommand, or unique prefix of
* it (will be an error for a non-unique
* prefix). */
char *fullName = NULL; /* Full name of the subcommand. */
int stringLength, i;
int tableLength = ensemblePtr->subcommandTable.numEntries;
subcmdName = TclGetString(objv[1 + ensemblePtr->numParameters]);
stringLength = objv[1 + ensemblePtr->numParameters]->length;
for (i=0 ; i<tableLength ; i++) {
register int cmp = strncmp(subcmdName,
ensemblePtr->subcommandArrayPtr[i],
(unsigned) stringLength);
if (cmp == 0) {
if (fullName != NULL) {
/*
* Since there's never the exact-match case to worry about
* (hash search filters this), getting here indicates that
* our subcommand is an ambiguous prefix of (at least) two
* exported subcommands, which is an error case.
*/
goto unknownOrAmbiguousSubcommand;
}
fullName = ensemblePtr->subcommandArrayPtr[i];
} else if (cmp < 0) {
/*
* Because we are searching a sorted table, we can now stop
* searching because we have gone past anything that could
* possibly match.
*/
break;
}
}
if (fullName == NULL) {
/*
* The subcommand is not a prefix of anything, so bail out!
*/
goto unknownOrAmbiguousSubcommand;
}
hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable, fullName);
if (hPtr == NULL) {
Tcl_Panic("full name %s not found in supposedly synchronized hash",
fullName);
}
prefixObj = Tcl_GetHashValue(hPtr);
/*
* Cache for later in the subcommand object.
*/
MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters],
ensemblePtr, fullName, prefixObj);
}
Tcl_IncrRefCount(prefixObj);
runResultingSubcommand:
/*
* Do the real work of execution of the subcommand by building an array of
* objects (note that this is potentially not the same length as the
* number of arguments to this ensemble command), populating it and then
* feeding it back through the main command-lookup engine. In theory, we
* could look up the command in the namespace ourselves, as we already
* have the namespace in which it is guaranteed to exist,
*
* ((Q: That's not true if the -map option is used, is it?))
*
* but we don't do that (the cacheing of the command object used should
* help with that.)
*/
{
Tcl_Obj **prefixObjv; /* The list of objects to substitute in as the
* target command prefix. */
Tcl_Obj *copyPtr; /* The actual list of words to dispatch to.
* Will be freed by the dispatch engine. */
int prefixObjc, copyObjc;
Interp *iPtr = (Interp *) interp;
/*
* Get the prefix that we're rewriting to. To do this we need to
* ensure that the internal representation of the list does not change
* so that we can safely keep the internal representations of the
* elements in the list.
*
* TODO: Use conventional list operations to make this code sane!
*/
TclListObjGetElements(NULL, prefixObj, &prefixObjc, &prefixObjv);
copyObjc = objc - 2 + prefixObjc;
copyPtr = Tcl_NewListObj(copyObjc, NULL);
if (copyObjc > 0) {
register Tcl_Obj **copyObjv;
/* Space used to construct the list of
* arguments to pass to the command that
* implements the ensemble subcommand. */
register List *listRepPtr = copyPtr->internalRep.twoPtrValue.ptr1;
register int i;
listRepPtr->elemCount = copyObjc;
copyObjv = &listRepPtr->elements;
memcpy(copyObjv, prefixObjv, sizeof(Tcl_Obj *) * prefixObjc);
memcpy(copyObjv+prefixObjc, objv+1,
sizeof(Tcl_Obj *) * ensemblePtr->numParameters);
memcpy(copyObjv+prefixObjc+ensemblePtr->numParameters,
objv+ensemblePtr->numParameters+2,
sizeof(Tcl_Obj *) * (objc-ensemblePtr->numParameters-2));
for (i=0; i < copyObjc; i++) {
Tcl_IncrRefCount(copyObjv[i]);
}
}
TclDecrRefCount(prefixObj);
/*
* Record what arguments the script sent in so that things like
* Tcl_WrongNumArgs can give the correct error message. Parameters
* count both as inserted and removed arguments.
*/
if (iPtr->ensembleRewrite.sourceObjs == NULL) {
iPtr->ensembleRewrite.sourceObjs = objv;
iPtr->ensembleRewrite.numRemovedObjs =
2 + ensemblePtr->numParameters;
iPtr->ensembleRewrite.numInsertedObjs =
prefixObjc + ensemblePtr->numParameters;
TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL,
NULL);
} else {
register int ni = 2 + ensemblePtr->numParameters
- iPtr->ensembleRewrite.numInsertedObjs;
/* Position in objv of new front of insertion
* relative to old one. */
if (ni > 0) {
iPtr->ensembleRewrite.numRemovedObjs += ni;
iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-1;
} else {
iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-2;
}
}
/*
* Hand off to the target command.
*/
TclSkipTailcall(interp);
return TclNREvalObjEx(interp, copyPtr, TCL_EVAL_INVOKE, NULL,INT_MIN);
}
unknownOrAmbiguousSubcommand:
/*
* Have not been able to match the subcommand asked for with a real
* subcommand that we export. See whether a handler has been registered
* for dealing with this situation. Will only call (at most) once for any
* particular ensemble invocation.
*/
if (ensemblePtr->unknownHandler != NULL && reparseCount++ < 1) {
switch (EnsembleUnknownCallback(interp, ensemblePtr, objc, objv,
&prefixObj)) {
case TCL_OK:
goto runResultingSubcommand;
case TCL_ERROR:
return TCL_ERROR;
case TCL_CONTINUE:
goto restartEnsembleParse;
}
}
/*
* We cannot determine what subcommand to hand off to, so generate a
* (standard) failure message. Note the one odd case compared with
* standard ensemble-like command, which is where a namespace has no
* exported commands at all...
*/
Tcl_ResetResult(interp);
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
if (ensemblePtr->subcommandTable.numEntries == 0) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"unknown subcommand \"%s\": namespace %s does not"
" export any commands",
TclGetString(objv[1+ensemblePtr->numParameters]),
ensemblePtr->nsPtr->fullName));
Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
return TCL_ERROR;
}
errorObj = Tcl_ObjPrintf("unknown%s subcommand \"%s\": must be ",
(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? " or ambiguous" : ""),
TclGetString(objv[1+ensemblePtr->numParameters]));
if (ensemblePtr->subcommandTable.numEntries == 1) {
Tcl_AppendToObj(errorObj, ensemblePtr->subcommandArrayPtr[0], -1);
} else {
int i;
for (i=0 ; i<ensemblePtr->subcommandTable.numEntries-1 ; i++) {
Tcl_AppendToObj(errorObj, ensemblePtr->subcommandArrayPtr[i], -1);
Tcl_AppendToObj(errorObj, ", ", 2);
}
Tcl_AppendPrintfToObj(errorObj, "or %s",
ensemblePtr->subcommandArrayPtr[i]);
}
Tcl_SetObjResult(interp, errorObj);
return TCL_ERROR;
}
int
TclClearRootEnsemble(
ClientData data[],
Tcl_Interp *interp,
int result)
{
TclResetRewriteEnsemble(interp, 1);
return result;
}
/*
*----------------------------------------------------------------------
*
* TclInitRewriteEnsemble --
*
* Applies a rewrite of arguments so that an ensemble subcommand will
* report error messages correctly for the overall command.
*
* Results:
* Whether this is the first rewrite applied, a value which must be
* passed to TclResetRewriteEnsemble when undoing this command's
* behaviour.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclInitRewriteEnsemble(
Tcl_Interp *interp,
int numRemoved,
int numInserted,
Tcl_Obj *const *objv)
{
Interp *iPtr = (Interp *) interp;
int isRootEnsemble = (iPtr->ensembleRewrite.sourceObjs == NULL);
if (isRootEnsemble) {
iPtr->ensembleRewrite.sourceObjs = objv;
iPtr->ensembleRewrite.numRemovedObjs = numRemoved;
iPtr->ensembleRewrite.numInsertedObjs = numInserted;
} else {
int numIns = iPtr->ensembleRewrite.numInsertedObjs;
if (numIns < numRemoved) {
iPtr->ensembleRewrite.numRemovedObjs += numRemoved - numIns;
iPtr->ensembleRewrite.numInsertedObjs += numInserted - 1;
} else {
iPtr->ensembleRewrite.numInsertedObjs += numInserted - numRemoved;
}
}
return isRootEnsemble;
}
/*
*----------------------------------------------------------------------
*
* TclResetRewriteEnsemble --
*
* Removes any rewrites applied to support proper reporting of error
* messages used in ensembles. Should be paired with
* TclInitRewriteEnsemble.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TclResetRewriteEnsemble(
Tcl_Interp *interp,
int isRootEnsemble)
{
Interp *iPtr = (Interp *) interp;
if (isRootEnsemble) {
iPtr->ensembleRewrite.sourceObjs = NULL;
iPtr->ensembleRewrite.numRemovedObjs = 0;
iPtr->ensembleRewrite.numInsertedObjs = 0;
}
}
/*
* ----------------------------------------------------------------------
*
* EnsmebleUnknownCallback --
*
* Helper for the ensemble engine that handles the procesing of unknown
* callbacks. See the user documentation of the ensemble unknown handler
* for details; this function is only ever called when such a function is
* defined, and is only ever called once per ensemble dispatch (i.e. if a
* reparse still fails, this isn't called again).
*
* Results:
* TCL_OK - *prefixObjPtr contains the command words to dispatch
* to.
* TCL_CONTINUE - Need to reparse (*prefixObjPtr is invalid).
* TCL_ERROR - Something went wrong! Error message in interpreter.
*
* Side effects:
* Calls the Tcl interpreter, so arbitrary.
*
* ----------------------------------------------------------------------
*/
static inline int
EnsembleUnknownCallback(
Tcl_Interp *interp,
EnsembleConfig *ensemblePtr,
int objc,
Tcl_Obj *const objv[],
Tcl_Obj **prefixObjPtr)
{
int paramc, i, result, prefixObjc;
Tcl_Obj **paramv, *unknownCmd, *ensObj;
/*
* Create the unknown command callback to determine what to do.
*/
unknownCmd = Tcl_DuplicateObj(ensemblePtr->unknownHandler);
TclNewObj(ensObj);
Tcl_GetCommandFullName(interp, ensemblePtr->token, ensObj);
Tcl_ListObjAppendElement(NULL, unknownCmd, ensObj);
for (i=1 ; i<objc ; i++) {
Tcl_ListObjAppendElement(NULL, unknownCmd, objv[i]);
}
TclListObjGetElements(NULL, unknownCmd, ¶mc, ¶mv);
Tcl_IncrRefCount(unknownCmd);
/*
* Now call the unknown handler. (We don't bother NRE-enabling this; deep
* recursing through unknown handlers is horribly perverse.) Note that it
* is always an error for an unknown handler to delete its ensemble; don't
* do that!
*/
Tcl_Preserve(ensemblePtr);
TclSkipTailcall(interp);
result = Tcl_EvalObjv(interp, paramc, paramv, 0);
if ((result == TCL_OK) && (ensemblePtr->flags & ENSEMBLE_DEAD)) {
if (!Tcl_InterpDeleted(interp)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"unknown subcommand handler deleted its ensemble", -1));
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "UNKNOWN_DELETED",
NULL);
}
result = TCL_ERROR;
}
Tcl_Release(ensemblePtr);
/*
* If we succeeded, we should either have a list of words that form the
* command to be executed, or an empty list. In the empty-list case, the
* ensemble is believed to be updated so we should ask the ensemble engine
* to reparse the original command.
*/
if (result == TCL_OK) {
*prefixObjPtr = Tcl_GetObjResult(interp);
Tcl_IncrRefCount(*prefixObjPtr);
TclDecrRefCount(unknownCmd);
Tcl_ResetResult(interp);
/*
* Namespace is still there. Check if the result is a valid list. If
* it is, and it is non-empty, that list is what we are using as our
* replacement.
*/
if (TclListObjLength(interp, *prefixObjPtr, &prefixObjc) != TCL_OK) {
TclDecrRefCount(*prefixObjPtr);
Tcl_AddErrorInfo(interp, "\n while parsing result of "
"ensemble unknown subcommand handler");
return TCL_ERROR;
}
if (prefixObjc > 0) {
return TCL_OK;
}
/*
* Namespace alive & empty result => reparse.
*/
TclDecrRefCount(*prefixObjPtr);
return TCL_CONTINUE;
}
/*
* Oh no! An exceptional result. Convert to an error.
*/
if (!Tcl_InterpDeleted(interp)) {
if (result != TCL_ERROR) {
Tcl_ResetResult(interp);
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"unknown subcommand handler returned bad code: ", -1));
switch (result) {
case TCL_RETURN:
Tcl_AppendToObj(Tcl_GetObjResult(interp), "return", -1);
break;
case TCL_BREAK:
Tcl_AppendToObj(Tcl_GetObjResult(interp), "break", -1);
break;
case TCL_CONTINUE:
Tcl_AppendToObj(Tcl_GetObjResult(interp), "continue", -1);
break;
default:
Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp), "%d", result);
}
Tcl_AddErrorInfo(interp, "\n result of "
"ensemble unknown subcommand handler: ");
Tcl_AppendObjToErrorInfo(interp, unknownCmd);
Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "UNKNOWN_RESULT",
NULL);
} else {
Tcl_AddErrorInfo(interp,
"\n (ensemble unknown subcommand handler)");
}
}
TclDecrRefCount(unknownCmd);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* MakeCachedEnsembleCommand --
*
* Cache what we've computed so far; it's not nice to repeatedly copy
* strings about. Note that to do this, we start by deleting any old
* representation that there was (though if it was an out of date
* ensemble rep, we can skip some of the deallocation process.)
*
* Results:
* None
*
* Side effects:
* Alters the internal representation of the first object parameter.
*
*----------------------------------------------------------------------
*/
static void
MakeCachedEnsembleCommand(
Tcl_Obj *objPtr,
EnsembleConfig *ensemblePtr,
const char *subcommandName,
Tcl_Obj *prefixObjPtr)
{
register EnsembleCmdRep *ensembleCmd;
int length;
if (objPtr->typePtr == &tclEnsembleCmdType) {
ensembleCmd = objPtr->internalRep.twoPtrValue.ptr1;
Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
TclNsDecrRefCount(ensembleCmd->nsPtr);
ckfree(ensembleCmd->fullSubcmdName);
} else {
/*
* Kill the old internal rep, and replace it with a brand new one of
* our own.
*/
TclFreeIntRep(objPtr);
ensembleCmd = ckalloc(sizeof(EnsembleCmdRep));
objPtr->internalRep.twoPtrValue.ptr1 = ensembleCmd;
objPtr->typePtr = &tclEnsembleCmdType;
}
/*
* Populate the internal rep.
*/
ensembleCmd->nsPtr = ensemblePtr->nsPtr;
ensembleCmd->epoch = ensemblePtr->epoch;
ensembleCmd->token = ensemblePtr->token;
ensemblePtr->nsPtr->refCount++;
ensembleCmd->realPrefixObj = prefixObjPtr;
length = strlen(subcommandName)+1;
ensembleCmd->fullSubcmdName = ckalloc(length);
memcpy(ensembleCmd->fullSubcmdName, subcommandName, (unsigned) length);
Tcl_IncrRefCount(ensembleCmd->realPrefixObj);
}
/*
*----------------------------------------------------------------------
*
* DeleteEnsembleConfig --
*
* Destroys the data structure used to represent an ensemble. This is
* called when the ensemble's command is deleted (which happens
* automatically if the ensemble's namespace is deleted.) Maintainers
* should note that ensembles should be deleted by deleting their
* commands.
*
* Results:
* None.
*
* Side effects:
* Memory is (eventually) deallocated.
*
*----------------------------------------------------------------------
*/
static void
DeleteEnsembleConfig(
ClientData clientData)
{
EnsembleConfig *ensemblePtr = clientData;
Namespace *nsPtr = ensemblePtr->nsPtr;
Tcl_HashSearch search;
Tcl_HashEntry *hEnt;
/*
* Unlink from the ensemble chain if it has not been marked as having been
* done already.
*/
if (ensemblePtr->next != ensemblePtr) {
EnsembleConfig *ensPtr = (EnsembleConfig *) nsPtr->ensembles;
if (ensPtr == ensemblePtr) {
nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr->next;
} else {
while (ensPtr != NULL) {
if (ensPtr->next == ensemblePtr) {
ensPtr->next = ensemblePtr->next;
break;
}
ensPtr = ensPtr->next;
}
}
}
/*
* Mark the namespace as dead so code that uses Tcl_Preserve() can tell
* whether disaster happened anyway.
*/
ensemblePtr->flags |= ENSEMBLE_DEAD;
/*
* Kill the pointer-containing fields.
*/
if (ensemblePtr->subcommandTable.numEntries != 0) {
ckfree(ensemblePtr->subcommandArrayPtr);
}
hEnt = Tcl_FirstHashEntry(&ensemblePtr->subcommandTable, &search);
while (hEnt != NULL) {
Tcl_Obj *prefixObj = Tcl_GetHashValue(hEnt);
Tcl_DecrRefCount(prefixObj);
hEnt = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(&ensemblePtr->subcommandTable);
if (ensemblePtr->subcmdList != NULL) {
Tcl_DecrRefCount(ensemblePtr->subcmdList);
}
if (ensemblePtr->parameterList != NULL) {
Tcl_DecrRefCount(ensemblePtr->parameterList);
}
if (ensemblePtr->subcommandDict != NULL) {
Tcl_DecrRefCount(ensemblePtr->subcommandDict);
}
if (ensemblePtr->unknownHandler != NULL) {
Tcl_DecrRefCount(ensemblePtr->unknownHandler);
}
/*
* Arrange for the structure to be reclaimed. Note that this is complex
* because we have to make sure that we can react sensibly when an
* ensemble is deleted during the process of initialising the ensemble
* (especially the unknown callback.)
*/
Tcl_EventuallyFree(ensemblePtr, TCL_DYNAMIC);
}
/*
*----------------------------------------------------------------------
*
* BuildEnsembleConfig --
*
* Create the internal data structures that describe how an ensemble
* looks, being a hash mapping from the full command name to the Tcl list
* that describes the implementation prefix words, and a sorted array of
* all the full command names to allow for reasonably efficient
* unambiguous prefix handling.
*
* Results:
* None.
*
* Side effects:
* Reallocates and rebuilds the hash table and array stored at the
* ensemblePtr argument. For large ensembles or large namespaces, this is
* a potentially expensive operation.
*
*----------------------------------------------------------------------
*/
static void
BuildEnsembleConfig(
EnsembleConfig *ensemblePtr)
{
Tcl_HashSearch search; /* Used for scanning the set of commands in
* the namespace that backs up this
* ensemble. */
int i, j, isNew;
Tcl_HashTable *hash = &ensemblePtr->subcommandTable;
Tcl_HashEntry *hPtr;
if (hash->numEntries != 0) {
/*
* Remove pre-existing table.
*/
ckfree(ensemblePtr->subcommandArrayPtr);
hPtr = Tcl_FirstHashEntry(hash, &search);
while (hPtr != NULL) {
Tcl_Obj *prefixObj = Tcl_GetHashValue(hPtr);
Tcl_DecrRefCount(prefixObj);
hPtr = Tcl_NextHashEntry(&search);
}
Tcl_DeleteHashTable(hash);
Tcl_InitHashTable(hash, TCL_STRING_KEYS);
}
/*
* See if we've got an export list. If so, we will only export exactly
* those commands, which may be either implemented by the prefix in the
* subcommandDict or mapped directly onto the namespace's commands.
*/
if (ensemblePtr->subcmdList != NULL) {
Tcl_Obj **subcmdv, *target, *cmdObj, *cmdPrefixObj;
int subcmdc;
TclListObjGetElements(NULL, ensemblePtr->subcmdList, &subcmdc,
&subcmdv);
for (i=0 ; i<subcmdc ; i++) {
const char *name = TclGetString(subcmdv[i]);
hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
/*
* Skip non-unique cases.
*/
if (!isNew) {
continue;
}
/*
* Look in our dictionary (if present) for the command.
*/
if (ensemblePtr->subcommandDict != NULL) {
Tcl_DictObjGet(NULL, ensemblePtr->subcommandDict, subcmdv[i],
&target);
if (target != NULL) {
Tcl_SetHashValue(hPtr, target);
Tcl_IncrRefCount(target);
continue;
}
}
/*
* Not there, so map onto the namespace. Note in this case that we
* do not guarantee that the command is actually there; that is
* the programmer's responsibility (or [::unknown] of course).
*/
cmdObj = NewNsObj((Tcl_Namespace *) ensemblePtr->nsPtr);
if (ensemblePtr->nsPtr->parentPtr != NULL) {
Tcl_AppendStringsToObj(cmdObj, "::", name, NULL);
} else {
Tcl_AppendStringsToObj(cmdObj, name, NULL);
}
cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
Tcl_SetHashValue(hPtr, cmdPrefixObj);
Tcl_IncrRefCount(cmdPrefixObj);
}
} else if (ensemblePtr->subcommandDict != NULL) {
/*
* No subcmd list, but we do have a mapping dictionary so we should
* use the keys of that. Convert the dictionary's contents into the
* form required for the ensemble's internal hashtable.
*/
Tcl_DictSearch dictSearch;
Tcl_Obj *keyObj, *valueObj;
int done;
Tcl_DictObjFirst(NULL, ensemblePtr->subcommandDict, &dictSearch,
&keyObj, &valueObj, &done);
while (!done) {
const char *name = TclGetString(keyObj);
hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
Tcl_SetHashValue(hPtr, valueObj);
Tcl_IncrRefCount(valueObj);
Tcl_DictObjNext(&dictSearch, &keyObj, &valueObj, &done);
}
} else {
/*
* Discover what commands are actually exported by the namespace.
* What we have is an array of patterns and a hash table whose keys
* are the command names exported by the namespace (the contents do
* not matter here.) We must find out what commands are actually
* exported by filtering each command in the namespace against each of
* the patterns in the export list. Note that we use an intermediate
* hash table to make memory management easier, and because that makes
* exact matching far easier too.
*
* Suggestion for future enhancement: compute the unique prefixes and
* place them in the hash too, which should make for even faster
* matching.
*/
hPtr = Tcl_FirstHashEntry(&ensemblePtr->nsPtr->cmdTable, &search);
for (; hPtr!= NULL ; hPtr=Tcl_NextHashEntry(&search)) {
char *nsCmdName = /* Name of command in namespace. */
Tcl_GetHashKey(&ensemblePtr->nsPtr->cmdTable, hPtr);
for (i=0 ; i<ensemblePtr->nsPtr->numExportPatterns ; i++) {
if (Tcl_StringMatch(nsCmdName,
ensemblePtr->nsPtr->exportArrayPtr[i])) {
hPtr = Tcl_CreateHashEntry(hash, nsCmdName, &isNew);
/*
* Remember, hash entries have a full reference to the
* substituted part of the command (as a list) as their
* content!
*/
if (isNew) {
Tcl_Obj *cmdObj, *cmdPrefixObj;
TclNewObj(cmdObj);
Tcl_AppendStringsToObj(cmdObj,
ensemblePtr->nsPtr->fullName,
(ensemblePtr->nsPtr->parentPtr ? "::" : ""),
nsCmdName, NULL);
cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
Tcl_SetHashValue(hPtr, cmdPrefixObj);
Tcl_IncrRefCount(cmdPrefixObj);
}
break;
}
}
}
}
if (hash->numEntries == 0) {
ensemblePtr->subcommandArrayPtr = NULL;
return;
}
/*
* Create a sorted array of all subcommands in the ensemble; hash tables
* are all very well for a quick look for an exact match, but they can't
* determine things like whether a string is a prefix of another (not
* without lots of preparation anyway) and they're no good for when we're
* generating the error message either.
*
* We do this by filling an array with the names (we use the hash keys
* directly to save a copy, since any time we change the array we change
* the hash too, and vice versa) and running quicksort over the array.
*/
ensemblePtr->subcommandArrayPtr =
ckalloc(sizeof(char *) * hash->numEntries);
/*
* Fill array from both ends as this makes us less likely to end up with
* performance problems in qsort(), which is good. Note that doing this
* makes this code much more opaque, but the naive alternatve:
*
* for (hPtr=Tcl_FirstHashEntry(hash,&search),i=0 ;
* hPtr!=NULL ; hPtr=Tcl_NextHashEntry(&search),i++) {
* ensemblePtr->subcommandArrayPtr[i] = Tcl_GetHashKey(hash, &hPtr);
* }
*
* can produce long runs of precisely ordered table entries when the
* commands in the namespace are declared in a sorted fashion (an ordering
* some people like) and the hashing functions (or the command names
* themselves) are fairly unfortunate. By filling from both ends, it
* requires active malice (and probably a debugger) to get qsort() to have
* awful runtime behaviour.
*/
i = 0;
j = hash->numEntries;
hPtr = Tcl_FirstHashEntry(hash, &search);
while (hPtr != NULL) {
ensemblePtr->subcommandArrayPtr[i++] = Tcl_GetHashKey(hash, hPtr);
hPtr = Tcl_NextHashEntry(&search);
if (hPtr == NULL) {
break;
}
ensemblePtr->subcommandArrayPtr[--j] = Tcl_GetHashKey(hash, hPtr);
hPtr = Tcl_NextHashEntry(&search);
}
if (hash->numEntries > 1) {
qsort(ensemblePtr->subcommandArrayPtr, (unsigned) hash->numEntries,
sizeof(char *), NsEnsembleStringOrder);
}
}
/*
*----------------------------------------------------------------------
*
* NsEnsembleStringOrder --
*
* Helper function to compare two pointers to two strings for use with
* qsort().
*
* Results:
* -1 if the first string is smaller, 1 if the second string is smaller,
* and 0 if they are equal.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
NsEnsembleStringOrder(
const void *strPtr1,
const void *strPtr2)
{
return strcmp(*(const char **)strPtr1, *(const char **)strPtr2);
}
/*
*----------------------------------------------------------------------
*
* FreeEnsembleCmdRep --
*
* Destroys the internal representation of a Tcl_Obj that has been
* holding information about a command in an ensemble.
*
* Results:
* None.
*
* Side effects:
* Memory is deallocated. If this held the last reference to a
* namespace's main structure, that main structure will also be
* destroyed.
*
*----------------------------------------------------------------------
*/
static void
FreeEnsembleCmdRep(
Tcl_Obj *objPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.twoPtrValue.ptr1;
Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
ckfree(ensembleCmd->fullSubcmdName);
TclNsDecrRefCount(ensembleCmd->nsPtr);
ckfree(ensembleCmd);
objPtr->typePtr = NULL;
}
/*
*----------------------------------------------------------------------
*
* DupEnsembleCmdRep --
*
* Makes one Tcl_Obj into a copy of another that is a subcommand of an
* ensemble.
*
* Results:
* None.
*
* Side effects:
* Memory is allocated, and the namespace that the ensemble is built on
* top of gains another reference.
*
*----------------------------------------------------------------------
*/
static void
DupEnsembleCmdRep(
Tcl_Obj *objPtr,
Tcl_Obj *copyPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.twoPtrValue.ptr1;
EnsembleCmdRep *ensembleCopy = ckalloc(sizeof(EnsembleCmdRep));
int length = strlen(ensembleCmd->fullSubcmdName);
copyPtr->typePtr = &tclEnsembleCmdType;
copyPtr->internalRep.twoPtrValue.ptr1 = ensembleCopy;
ensembleCopy->nsPtr = ensembleCmd->nsPtr;
ensembleCopy->epoch = ensembleCmd->epoch;
ensembleCopy->token = ensembleCmd->token;
ensembleCopy->nsPtr->refCount++;
ensembleCopy->realPrefixObj = ensembleCmd->realPrefixObj;
Tcl_IncrRefCount(ensembleCopy->realPrefixObj);
ensembleCopy->fullSubcmdName = ckalloc(length + 1);
memcpy(ensembleCopy->fullSubcmdName, ensembleCmd->fullSubcmdName,
(unsigned) length+1);
}
/*
*----------------------------------------------------------------------
*
* StringOfEnsembleCmdRep --
*
* Creates a string representation of a Tcl_Obj that holds a subcommand
* of an ensemble.
*
* Results:
* None.
*
* Side effects:
* The object gains a string (UTF-8) representation.
*
*----------------------------------------------------------------------
*/
static void
StringOfEnsembleCmdRep(
Tcl_Obj *objPtr)
{
EnsembleCmdRep *ensembleCmd = objPtr->internalRep.twoPtrValue.ptr1;
int length = strlen(ensembleCmd->fullSubcmdName);
objPtr->length = length;
objPtr->bytes = ckalloc(length + 1);
memcpy(objPtr->bytes, ensembleCmd->fullSubcmdName, (unsigned) length+1);
}
/*
*----------------------------------------------------------------------
*
* TclCompileEnsemble --
*
* Procedure called to compile an ensemble command. Note that most
* ensembles are not compiled, since modifying a compiled ensemble causes
* a invalidation of all existing bytecode (expensive!) which is not
* normally warranted.
*
* Results:
* Returns TCL_OK for a successful compile. Returns TCL_ERROR to defer
* evaluation to runtime.
*
* Side effects:
* Instructions are added to envPtr to execute the subcommands of the
* ensemble at runtime if a compile-time mapping is possible.
*
*----------------------------------------------------------------------
*/
int
TclCompileEnsemble(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);
Tcl_Obj *mapObj, *subcmdObj, *targetCmdObj, *listObj, **elems;
Tcl_Obj *replaced = Tcl_NewObj(), *replacement;
Tcl_Command ensemble = (Tcl_Command) cmdPtr;
Command *oldCmdPtr = cmdPtr, *newCmdPtr;
int len, result, flags = 0, i, depth = 1, invokeAnyway = 0;
int ourResult = TCL_ERROR;
unsigned numBytes;
const char *word;
Tcl_IncrRefCount(replaced);
/*
* This is where we return to if we are parsing multiple nested compiled
* ensembles. [info object] is such a beast.
*/
checkNextWord:
if (parsePtr->numWords < depth + 1) {
goto failed;
}
if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) {
/*
* Too hard.
*/
goto failed;
}
word = tokenPtr[1].start;
numBytes = tokenPtr[1].size;
/*
* There's a sporting chance we'll be able to compile this. But now we
* must check properly. To do that, check that we're compiling an ensemble
* that has a compilable command as its appropriate subcommand.
*/
if (Tcl_GetEnsembleMappingDict(NULL, ensemble, &mapObj) != TCL_OK
|| mapObj == NULL) {
/*
* Either not an ensemble or a mapping isn't installed. Crud. Too hard
* to proceed.
*/
goto failed;
}
/*
* Also refuse to compile anything that uses a formal parameter list for
* now, on the grounds that it is too complex.
*/
if (Tcl_GetEnsembleParameterList(NULL, ensemble, &listObj) != TCL_OK
|| listObj != NULL) {
/*
* Figuring out how to compile this has become too much. Bail out.
*/
goto failed;
}
/*
* Next, get the flags. We need them on several code paths so that we can
* know whether we're to do prefix matching.
*/
(void) Tcl_GetEnsembleFlags(NULL, ensemble, &flags);
/*
* Check to see if there's also a subcommand list; must check to see if
* the subcommand we are calling is in that list if it exists, since that
* list filters the entries in the map.
*/
(void) Tcl_GetEnsembleSubcommandList(NULL, ensemble, &listObj);
if (listObj != NULL) {
int sclen;
const char *str;
Tcl_Obj *matchObj = NULL;
if (Tcl_ListObjGetElements(NULL, listObj, &len, &elems) != TCL_OK) {
goto failed;
}
for (i=0 ; i<len ; i++) {
str = Tcl_GetStringFromObj(elems[i], &sclen);
if ((sclen == (int) numBytes) && !memcmp(word, str, numBytes)) {
/*
* Exact match! Excellent!
*/
result = Tcl_DictObjGet(NULL, mapObj,elems[i], &targetCmdObj);
if (result != TCL_OK || targetCmdObj == NULL) {
goto failed;
}
replacement = elems[i];
goto doneMapLookup;
}
/*
* Check to see if we've got a prefix match. A single prefix match
* is fine, and allows us to refine our dictionary lookup, but
* multiple prefix matches is a Bad Thing and will prevent us from
* making progress. Note that we cannot do the lookup immediately
* in the prefix case; might be another entry later in the list
* that causes things to fail.
*/
if ((flags & TCL_ENSEMBLE_PREFIX)
&& strncmp(word, str, numBytes) == 0) {
if (matchObj != NULL) {
goto failed;
}
matchObj = elems[i];
}
}
if (matchObj == NULL) {
goto failed;
}
result = Tcl_DictObjGet(NULL, mapObj, matchObj, &targetCmdObj);
if (result != TCL_OK || targetCmdObj == NULL) {
goto failed;
}
replacement = matchObj;
} else {
Tcl_DictSearch s;
int done, matched;
Tcl_Obj *tmpObj;
/*
* No map, so check the dictionary directly.
*/
TclNewStringObj(subcmdObj, word, (int) numBytes);
result = Tcl_DictObjGet(NULL, mapObj, subcmdObj, &targetCmdObj);
if (result == TCL_OK && targetCmdObj != NULL) {
/*
* Got it. Skip the fiddling around with prefixes.
*/
replacement = subcmdObj;
goto doneMapLookup;
}
TclDecrRefCount(subcmdObj);
/*
* We've not literally got a valid subcommand. But maybe we have a
* prefix. Check if prefix matches are allowed.
*/
if (!(flags & TCL_ENSEMBLE_PREFIX)) {
goto failed;
}
/*
* Iterate over the keys in the dictionary, checking to see if we're a
* prefix.
*/
Tcl_DictObjFirst(NULL, mapObj, &s, &subcmdObj, &tmpObj, &done);
matched = 0;
replacement = NULL; /* Silence, fool compiler! */
while (!done) {
if (strncmp(TclGetString(subcmdObj), word, numBytes) == 0) {
if (matched++) {
/*
* Must have matched twice! Not unique, so no point
* looking further.
*/
break;
}
replacement = subcmdObj;
targetCmdObj = tmpObj;
}
Tcl_DictObjNext(&s, &subcmdObj, &tmpObj, &done);
}
Tcl_DictObjDone(&s);
/*
* If we have anything other than a single match, we've failed the
* unique prefix check.
*/
if (matched != 1) {
invokeAnyway = 1;
goto failed;
}
}
/*
* OK, we definitely map to something. But what?
*
* The command we map to is the first word out of the map element. Note
* that we also reject dealing with multi-element rewrites if we are in a
* safe interpreter, as there is otherwise a (highly gnarly!) way to make
* Tcl crash open to exploit.
*/
doneMapLookup:
Tcl_ListObjAppendElement(NULL, replaced, replacement);
if (Tcl_ListObjGetElements(NULL, targetCmdObj, &len, &elems) != TCL_OK) {
goto failed;
} else if (len != 1) {
/*
* Note that at this point we know we can't issue any special
* instruction sequence as the mapping isn't one that we support at
* the compiled level.
*/
goto cleanup;
}
targetCmdObj = elems[0];
oldCmdPtr = cmdPtr;
Tcl_IncrRefCount(targetCmdObj);
newCmdPtr = (Command *) Tcl_GetCommandFromObj(interp, targetCmdObj);
TclDecrRefCount(targetCmdObj);
if (newCmdPtr == NULL || Tcl_IsSafe(interp)
|| newCmdPtr->nsPtr->flags & NS_SUPPRESS_COMPILATION
|| newCmdPtr->flags & CMD_HAS_EXEC_TRACES
|| ((Interp *)interp)->flags & DONT_COMPILE_CMDS_INLINE) {
/*
* Maps to an undefined command or a command without a compiler.
* Cannot compile.
*/
goto cleanup;
}
cmdPtr = newCmdPtr;
depth++;
/*
* See whether we have a nested ensemble. If we do, we can go round the
* mulberry bush again, consuming the next word.
*/
if (cmdPtr->compileProc == TclCompileEnsemble) {
tokenPtr = TokenAfter(tokenPtr);
ensemble = (Tcl_Command) cmdPtr;
goto checkNextWord;
}
/*
* Now we've done the mapping process, can now actually try to compile.
* If there is a subcommand compiler and that successfully produces code,
* we'll use that. Otherwise, we fall back to generating opcodes to do the
* invoke at runtime.
*/
invokeAnyway = 1;
if (TCL_OK == TclAttemptCompileProc(interp, parsePtr, depth, cmdPtr,
envPtr)) {
ourResult = TCL_OK;
goto cleanup;
}
/*
* Failed to do a full compile for some reason. Try to do a direct invoke
* instead of going through the ensemble lookup process again.
*/
failed:
if (depth < 250) {
if (depth > 1) {
if (!invokeAnyway) {
cmdPtr = oldCmdPtr;
depth--;
}
(void) Tcl_ListObjReplace(NULL, replaced, depth, 2, 0, NULL);
}
CompileToInvokedCommand(interp, parsePtr, replaced, cmdPtr, envPtr);
ourResult = TCL_OK;
}
/*
* Release the memory we allocated. If we've got here, we've either done
* something useful or we're in a case that we can't compile at all and
* we're just giving up.
*/
cleanup:
Tcl_DecrRefCount(replaced);
return ourResult;
}
int
TclAttemptCompileProc(
Tcl_Interp *interp,
Tcl_Parse *parsePtr,
int depth,
Command *cmdPtr,
CompileEnv *envPtr) /* Holds resulting instructions. */
{
int result, i;
Tcl_Token *saveTokenPtr = parsePtr->tokenPtr;
int savedStackDepth = envPtr->currStackDepth;
unsigned savedCodeNext = envPtr->codeNext - envPtr->codeStart;
DefineLineInformation;
if (cmdPtr->compileProc == NULL) {
return TCL_ERROR;
}
/*
* Advance parsePtr->tokenPtr so that it points at the last subcommand.
* This will be wrong, but it will not matter, and it will put the
* tokens for the arguments in the right place without the needed to
* allocate a synthetic Tcl_Parse struct, or copy tokens around.
*/
for (i = 0; i < depth - 1; i++) {
parsePtr->tokenPtr = TokenAfter(parsePtr->tokenPtr);
}
parsePtr->numWords -= (depth - 1);
/*
* Shift the line information arrays to account for different word
* index values.
*/
mapPtr->loc[eclIndex].line += (depth - 1);
mapPtr->loc[eclIndex].next += (depth - 1);
/*
* Hand off compilation to the subcommand compiler. At last!
*/
result = cmdPtr->compileProc(interp, parsePtr, cmdPtr, envPtr);
/*
* Undo the shift.
*/
mapPtr->loc[eclIndex].line -= (depth - 1);
mapPtr->loc[eclIndex].next -= (depth - 1);
parsePtr->numWords += (depth - 1);
parsePtr->tokenPtr = saveTokenPtr;
/*
* If our target failed to compile, revert any data from failed partial
* compiles. Note that envPtr->numCommands need not be checked because
* we avoid compiling subcommands that recursively call TclCompileScript().
*/
if (result != TCL_OK) {
envPtr->currStackDepth = savedStackDepth;
envPtr->codeNext = envPtr->codeStart + savedCodeNext;
#ifdef TCL_COMPILE_DEBUG
} else {
/*
* Confirm that the command compiler generated a single value on
* the stack as its result. This is only done in debugging mode,
* as it *should* be correct and normal users have no reasonable
* way to fix it anyway.
*/
int diff = envPtr->currStackDepth - savedStackDepth;
if (diff != 1) {
Tcl_Panic("bad stack adjustment when compiling"
" %.*s (was %d instead of 1)", parsePtr->tokenPtr->size,
parsePtr->tokenPtr->start, diff);
}
#endif
}
return result;
}
/*
* How to compile a subcommand to a _replacing_ invoke of its implementation
* command.
*/
static void
CompileToInvokedCommand(
Tcl_Interp *interp,
Tcl_Parse *parsePtr,
Tcl_Obj *replacements,
Command *cmdPtr,
CompileEnv *envPtr) /* Holds resulting instructions. */
{
Tcl_Token *tokPtr;
Tcl_Obj *objPtr, **words;
char *bytes;
int length, i, numWords, cmdLit;
DefineLineInformation;
/*
* Push the words of the command. Take care; the command words may be
* scripts that have backslashes in them, and [info frame 0] can see the
* difference. Hence the call to TclContinuationsEnterDerived...
*/
Tcl_ListObjGetElements(NULL, replacements, &numWords, &words);
for (i = 0, tokPtr = parsePtr->tokenPtr; i < parsePtr->numWords;
i++, tokPtr = TokenAfter(tokPtr)) {
if (i > 0 && i < numWords+1) {
bytes = Tcl_GetStringFromObj(words[i-1], &length);
PushLiteral(envPtr, bytes, length);
continue;
}
SetLineInformation(i);
if (tokPtr->type == TCL_TOKEN_SIMPLE_WORD) {
int literal = TclRegisterNewLiteral(envPtr,
tokPtr[1].start, tokPtr[1].size);
if (envPtr->clNext) {
TclContinuationsEnterDerived(
TclFetchLiteral(envPtr, literal),
tokPtr[1].start - envPtr->source,
envPtr->clNext);
}
TclEmitPush(literal, envPtr);
} else {
CompileTokens(envPtr, tokPtr, interp);
}
}
/*
* Push the name of the command we're actually dispatching to as part of
* the implementation.
*/
objPtr = Tcl_NewObj();
Tcl_GetCommandFullName(interp, (Tcl_Command) cmdPtr, objPtr);
bytes = Tcl_GetStringFromObj(objPtr, &length);
cmdLit = TclRegisterNewCmdLiteral(envPtr, bytes, length);
TclSetCmdNameObj(interp, TclFetchLiteral(envPtr, cmdLit), cmdPtr);
TclEmitPush(cmdLit, envPtr);
TclDecrRefCount(objPtr);
/*
* Do the replacing dispatch.
*/
TclEmitInstInt4(INST_INVOKE_REPLACE, parsePtr->numWords, envPtr);
TclEmitInt1(numWords+1, envPtr);
TclAdjustStackDepth(-1, envPtr); /* Correction to stack depth calcs. */
}
/*
* Helpers that do issuing of instructions for commands that "don't have
* compilers" (well, they do; these). They all work by just generating base
* code to invoke the command; they're intended for ensemble subcommands so
* that the costs of INST_INVOKE_REPLACE can be avoided where we can work out
* that they're not needed.
*
* Note that these are NOT suitable for commands where there's an argument
* that is a script, as an [info level] or [info frame] in the inner context
* can see the difference.
*/
static int
CompileBasicNArgCommand(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
Tcl_Obj *objPtr = Tcl_NewObj();
Tcl_IncrRefCount(objPtr);
Tcl_GetCommandFullName(interp, (Tcl_Command) cmdPtr, objPtr);
TclCompileInvocation(interp, parsePtr->tokenPtr, objPtr,
parsePtr->numWords, envPtr);
Tcl_DecrRefCount(objPtr);
return TCL_OK;
}
int
TclCompileBasic0ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 1) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic1ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 2) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic2ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 3) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic3ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 4) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic0Or1ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 1 && parsePtr->numWords != 2) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic1Or2ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 2 && parsePtr->numWords != 3) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic2Or3ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords != 3 && parsePtr->numWords != 4) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic0To2ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords < 1 || parsePtr->numWords > 3) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasic1To3ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords < 2 || parsePtr->numWords > 4) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasicMin0ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords < 1) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasicMin1ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords < 2) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
int
TclCompileBasicMin2ArgCmd(
Tcl_Interp *interp, /* Used for error reporting. */
Tcl_Parse *parsePtr, /* Points to a parse structure for the command
* created by Tcl_ParseCommand. */
Command *cmdPtr, /* Points to defintion of command being
* compiled. */
CompileEnv *envPtr) /* Holds resulting instructions. */
{
/*
* Verify that the number of arguments is correct; that's the only case
* that we know will avoid the call to Tcl_WrongNumArgs() at invoke time,
* which is the only code that sees the shenanigans of ensemble dispatch.
*/
if (parsePtr->numWords < 3) {
return TCL_ERROR;
}
return CompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/