diff options
Diffstat (limited to 'generic/tclCompEnsemble.c')
| -rw-r--r-- | generic/tclCompEnsemble.c | 802 |
1 files changed, 802 insertions, 0 deletions
diff --git a/generic/tclCompEnsemble.c b/generic/tclCompEnsemble.c new file mode 100644 index 0000000..2c2c15f --- /dev/null +++ b/generic/tclCompEnsemble.c @@ -0,0 +1,802 @@ +#include "tclEngineInt.h" + +/* + * How to compile a subcommand using its own command compiler. To do that, we + * have to perform some trickery to rewrite the arguments, as compilers *must* + * have parse tokens that refer to addresses in the original script. + */ + +int +TclCompileToCompiledCommand( + Tcl_Interp *interp, + Tcl_Parse *parsePtr, + int depth, + Command *cmdPtr, + CompileEnv *envPtr) /* Holds resulting instructions. */ +{ + Tcl_Parse synthetic; + Tcl_Token *tokenPtr; + int result, i; + int savedNumCmds = envPtr->numCommands; + int savedStackDepth = envPtr->currStackDepth; + unsigned savedCodeNext = envPtr->codeNext - envPtr->codeStart; + + if (cmdPtr->compileProc == NULL) { + return TCL_ERROR; + } + + TclParseInit(interp, NULL, 0, &synthetic); + synthetic.numWords = parsePtr->numWords - depth + 1; + TclGrowParseTokenArray(&synthetic, 2); + synthetic.numTokens = 2; + + /* + * Now we have the space to work in, install something rewritten. The + * first word will "officially" be the bytes of the structured ensemble + * name. That's technically wrong, but nobody will care; we just need + * *something* here... + */ + + synthetic.tokenPtr[0].type = TCL_TOKEN_SIMPLE_WORD; + synthetic.tokenPtr[0].start = parsePtr->tokenPtr[0].start; + synthetic.tokenPtr[0].numComponents = 1; + synthetic.tokenPtr[1].type = TCL_TOKEN_TEXT; + synthetic.tokenPtr[1].start = parsePtr->tokenPtr[0].start; + synthetic.tokenPtr[1].numComponents = 0; + for (i=0,tokenPtr=parsePtr->tokenPtr ; i<depth ; i++) { + int sclen = (tokenPtr->start - synthetic.tokenPtr[0].start) + + tokenPtr->size; + + synthetic.tokenPtr[0].size = sclen; + synthetic.tokenPtr[1].size = sclen; + tokenPtr = TokenAfter(tokenPtr); + } + + /* + * Copy over the real argument tokens. + */ + + for (i=1; i<synthetic.numWords; i++) { + int toCopy; + + toCopy = tokenPtr->numComponents + 1; + TclGrowParseTokenArray(&synthetic, toCopy); + memcpy(synthetic.tokenPtr + synthetic.numTokens, tokenPtr, + sizeof(Tcl_Token) * toCopy); + synthetic.numTokens += toCopy; + tokenPtr = TokenAfter(tokenPtr); + } + + /* + * Hand off compilation to the subcommand compiler. At last! + */ + + result = cmdPtr->compileProc(interp, &synthetic, cmdPtr, envPtr); + + /* + * If our target fails to compile, revert the number of commands and the + * pointer to the place to issue the next instruction. [Bug 3600328] + */ + + if (result != TCL_OK) { + envPtr->numCommands = savedNumCmds; + envPtr->currStackDepth = savedStackDepth; + envPtr->codeNext = envPtr->codeStart + savedCodeNext; + } + + /* + * Clean up if necessary. + */ + + Tcl_FreeParse(&synthetic); + return result; +} + +/* + * How to compile a subcommand to a _replacing_ invoke of its implementation + * command. + */ + +void +TclCompileToInvokedCommand( + 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; + + /* + * 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++) { + if (i > 0 && i < numWords+1) { + bytes = Tcl_GetStringFromObj(words[i-1], &length); + PushLiteral(envPtr, bytes, length); + } else if (tokPtr->type == TCL_TOKEN_SIMPLE_WORD) { + int literal = TclRegisterNewLiteral(envPtr, + tokPtr[1].start, tokPtr[1].size); + + TclEmitPush(literal, envPtr); + } else { + CompileTokens(envPtr, tokPtr, interp); + } + tokPtr = TokenAfter(tokPtr); + } + + /* + * 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, envPtr->literalArrayPtr[cmdLit].objPtr, 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. + */ + +int +TclCompileBasicNArgCommand( + 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; + Tcl_Obj *objPtr; + char *bytes; + int length, i, literal; + + /* + * 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); + literal = TclRegisterNewCmdLiteral(envPtr, bytes, length); + TclSetCmdNameObj(interp, envPtr->literalArrayPtr[literal].objPtr, cmdPtr); + TclEmitPush(literal, envPtr); + TclDecrRefCount(objPtr); + + /* + * Push the words of the command. + */ + + tokenPtr = TokenAfter(parsePtr->tokenPtr); + for (i=1 ; i<parsePtr->numWords ; i++) { + if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { + PushLiteral(envPtr, tokenPtr[1].start, tokenPtr[1].size); + } else { + CompileTokens(envPtr, tokenPtr, interp); + } + tokenPtr = TokenAfter(tokenPtr); + } + + /* + * Do the standard dispatch. + */ + + if (i <= 255) { + TclEmitInstInt1(INST_INVOKE_STK1, i, envPtr); + } else { + TclEmitInstInt4(INST_INVOKE_STK4, i, envPtr); + } + 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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(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 TclCompileBasicNArgCommand(interp, parsePtr, cmdPtr, envPtr); +} + + +/* + *---------------------------------------------------------------------- + * + * 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 (TclCompileToCompiledCommand(interp, parsePtr, depth, cmdPtr, + envPtr) == TCL_OK) { + 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); + } + TclCompileToInvokedCommand(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; +} + |