/* * tclCompCmds.c -- * * This file contains compilation procedures that compile various Tcl * commands into a sequence of instructions ("bytecodes"). * * Copyright (c) 1997-1998 Sun Microsystems, Inc. * Copyright (c) 2001 by Kevin B. Kenny. All rights reserved. * Copyright (c) 2002 ActiveState Corporation. * Copyright (c) 2004-2006 by 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" #include /* * Prototypes for procedures defined later in this file: */ static ClientData DupDictUpdateInfo(ClientData clientData); static void FreeDictUpdateInfo(ClientData clientData); static void PrintDictUpdateInfo(ClientData clientData, Tcl_Obj *appendObj, ByteCode *codePtr, unsigned int pcOffset); static ClientData DupForeachInfo(ClientData clientData); static void FreeForeachInfo(ClientData clientData); static void PrintForeachInfo(ClientData clientData, Tcl_Obj *appendObj, ByteCode *codePtr, unsigned int pcOffset); static void CompileReturnInternal(CompileEnv *envPtr, unsigned char op, int code, int level, Tcl_Obj *returnOpts); static int IndexTailVarIfKnown(Tcl_Interp *interp, Tcl_Token *varTokenPtr, CompileEnv *envPtr); static int PushVarName(Tcl_Interp *interp, Tcl_Token *varTokenPtr, CompileEnv *envPtr, int flags, int *localIndexPtr, int *simpleVarNamePtr, int *isScalarPtr, int line, int *clNext); static int CompileEachloopCmd(Tcl_Interp *interp, Tcl_Parse *parsePtr, Command *cmdPtr, CompileEnv *envPtr, int collect); static int CompileDictEachCmd(Tcl_Interp *interp, Tcl_Parse *parsePtr, Command *cmdPtr, struct CompileEnv *envPtr, int collect); /* * Macro that encapsulates an efficiency trick that avoids a function call for * the simplest of compiles. The ANSI C "prototype" for this macro is: * * static void CompileWord(CompileEnv *envPtr, Tcl_Token *tokenPtr, * Tcl_Interp *interp, int word); */ #define CompileWord(envPtr, tokenPtr, interp, word) \ if ((tokenPtr)->type == TCL_TOKEN_SIMPLE_WORD) { \ TclEmitPush(TclRegisterNewLiteral((envPtr), (tokenPtr)[1].start, \ (tokenPtr)[1].size), (envPtr)); \ } else { \ envPtr->line = mapPtr->loc[eclIndex].line[word]; \ envPtr->clNext = mapPtr->loc[eclIndex].next[word]; \ TclCompileTokens((interp), (tokenPtr)+1, (tokenPtr)->numComponents, \ (envPtr)); \ } /* * TIP #280: Remember the per-word line information of the current command. An * index is used instead of a pointer as recursive compilation may reallocate, * i.e. move, the array. This is also the reason to save the nuloc now, it may * change during the course of the function. * * Macro to encapsulate the variable definition and setup. */ #define DefineLineInformation \ ExtCmdLoc *mapPtr = envPtr->extCmdMapPtr; \ int eclIndex = mapPtr->nuloc - 1 #define SetLineInformation(word) \ envPtr->line = mapPtr->loc[eclIndex].line[(word)]; \ envPtr->clNext = mapPtr->loc[eclIndex].next[(word)] #define PushVarNameWord(i,v,e,f,l,s,sc,word) \ PushVarName(i,v,e,f,l,s,sc, \ mapPtr->loc[eclIndex].line[(word)], \ mapPtr->loc[eclIndex].next[(word)]) /* * Often want to issue one of two versions of an instruction based on whether * the argument will fit in a single byte or not. This makes it much clearer. */ #define Emit14Inst(nm,idx,envPtr) \ if (idx <= 255) { \ TclEmitInstInt1(nm##1,idx,envPtr); \ } else { \ TclEmitInstInt4(nm##4,idx,envPtr); \ } /* * Flags bits used by PushVarName. */ #define TCL_NO_LARGE_INDEX 1 /* Do not return localIndex value > 255 */ /* * The structures below define the AuxData types defined in this file. */ const AuxDataType tclForeachInfoType = { "ForeachInfo", /* name */ DupForeachInfo, /* dupProc */ FreeForeachInfo, /* freeProc */ PrintForeachInfo /* printProc */ }; const AuxDataType tclDictUpdateInfoType = { "DictUpdateInfo", /* name */ DupDictUpdateInfo, /* dupProc */ FreeDictUpdateInfo, /* freeProc */ PrintDictUpdateInfo /* printProc */ }; /* *---------------------------------------------------------------------- * * TclCompileAppendCmd -- * * Procedure called to compile the "append" command. * * 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 "append" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileAppendCmd( 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 *varTokenPtr, *valueTokenPtr; int simpleVarName, isScalar, localIndex, numWords; DefineLineInformation; /* TIP #280 */ numWords = parsePtr->numWords; if (numWords == 1) { return TCL_ERROR; } else if (numWords == 2) { /* * append varName == set varName */ return TclCompileSetCmd(interp, parsePtr, cmdPtr, envPtr); } else if (numWords > 3) { /* * APPEND instructions currently only handle one value. */ return TCL_ERROR; } /* * Decide if we can use a frame slot for the var/array name or if we need * to emit code to compute and push the name at runtime. We use a frame * slot (entry in the array of local vars) if we are compiling a procedure * body and if the name is simple text that does not include namespace * qualifiers. */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, varTokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); /* * We are doing an assignment, otherwise TclCompileSetCmd was called, so * push the new value. This will need to be extended to push a value for * each argument. */ if (numWords > 2) { valueTokenPtr = TokenAfter(varTokenPtr); CompileWord(envPtr, valueTokenPtr, interp, 2); } /* * Emit instructions to set/get the variable. */ if (simpleVarName) { if (isScalar) { if (localIndex < 0) { TclEmitOpcode(INST_APPEND_STK, envPtr); } else { Emit14Inst(INST_APPEND_SCALAR, localIndex, envPtr); } } else { if (localIndex < 0) { TclEmitOpcode(INST_APPEND_ARRAY_STK, envPtr); } else { Emit14Inst(INST_APPEND_ARRAY, localIndex, envPtr); } } } else { TclEmitOpcode(INST_APPEND_STK, envPtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileArray*Cmd -- * * Functions called to compile "array" sucommands. * * Results: * All return TCL_OK for a successful compile, and TCL_ERROR to defer * evaluation to runtime. * * Side effects: * Instructions are added to envPtr to execute the "array" subcommand at * runtime. * *---------------------------------------------------------------------- */ int TclCompileArrayExistsCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr; int simpleVarName, isScalar, localIndex; if (parsePtr->numWords != 2) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); if (!isScalar) { return TCL_ERROR; } if (localIndex >= 0) { TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex, envPtr); } else { TclEmitOpcode( INST_ARRAY_EXISTS_STK, envPtr); } return TCL_OK; } int TclCompileArraySetCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr; int simpleVarName, isScalar, localIndex; int dataVar, iterVar, keyVar, valVar, infoIndex; int back, fwd, offsetBack, offsetFwd, savedStackDepth; ForeachInfo *infoPtr; if (parsePtr->numWords != 3) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); if (!isScalar) { return TCL_ERROR; } tokenPtr = TokenAfter(tokenPtr); /* * Special case: literal empty value argument is just an "ensure array" * operation. */ if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD && tokenPtr[1].size == 0) { if (localIndex >= 0) { TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex, envPtr); TclEmitInstInt1(INST_JUMP_TRUE1, 7, envPtr); TclEmitInstInt4(INST_ARRAY_MAKE_IMM, localIndex, envPtr); } else { TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_ARRAY_EXISTS_STK, envPtr); TclEmitInstInt1(INST_JUMP_TRUE1, 5, envPtr); savedStackDepth = envPtr->currStackDepth; TclEmitOpcode( INST_ARRAY_MAKE_STK, envPtr); TclEmitInstInt1(INST_JUMP1, 3, envPtr); envPtr->currStackDepth = savedStackDepth; TclEmitOpcode( INST_POP, envPtr); } PushLiteral(envPtr, "", 0); return TCL_OK; } /* * Prepare for the internal foreach. */ if (envPtr->procPtr == NULL) { return TCL_ERROR; } dataVar = TclFindCompiledLocal(NULL, 0, 1, envPtr); iterVar = TclFindCompiledLocal(NULL, 0, 1, envPtr); keyVar = TclFindCompiledLocal(NULL, 0, 1, envPtr); valVar = TclFindCompiledLocal(NULL, 0, 1, envPtr); infoPtr = ckalloc(sizeof(ForeachInfo) + sizeof(ForeachVarList *)); infoPtr->numLists = 1; infoPtr->firstValueTemp = dataVar; infoPtr->loopCtTemp = iterVar; infoPtr->varLists[0] = ckalloc(sizeof(ForeachVarList) * 2*sizeof(int)); infoPtr->varLists[0]->numVars = 2; infoPtr->varLists[0]->varIndexes[0] = keyVar; infoPtr->varLists[0]->varIndexes[1] = valVar; infoIndex = TclCreateAuxData(infoPtr, &tclForeachInfoType, envPtr); /* * Start issuing instructions to write to the array. */ CompileWord(envPtr, tokenPtr, interp, 2); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_LIST_LENGTH, envPtr); PushLiteral(envPtr, "1", 1); TclEmitOpcode( INST_BITAND, envPtr); offsetFwd = CurrentOffset(envPtr); TclEmitInstInt1( INST_JUMP_FALSE1, 0, envPtr); savedStackDepth = envPtr->currStackDepth; PushLiteral(envPtr, "list must have an even number of elements", strlen("list must have an even number of elements")); PushLiteral(envPtr, "-errorCode {TCL ARGUMENT FORMAT}", strlen("-errorCode {TCL ARGUMENT FORMAT}")); TclEmitInstInt4( INST_RETURN_IMM, 1, envPtr); TclEmitInt4( 0, envPtr); envPtr->currStackDepth = savedStackDepth; fwd = CurrentOffset(envPtr) - offsetFwd; TclStoreInt1AtPtr(fwd, envPtr->codeStart+offsetFwd+1); Emit14Inst( INST_STORE_SCALAR, dataVar, envPtr); TclEmitOpcode( INST_POP, envPtr); if (localIndex >= 0) { TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex, envPtr); TclEmitInstInt1(INST_JUMP_TRUE1, 7, envPtr); TclEmitInstInt4(INST_ARRAY_MAKE_IMM, localIndex, envPtr); TclEmitInstInt4(INST_FOREACH_START4, infoIndex, envPtr); offsetBack = CurrentOffset(envPtr); TclEmitInstInt4(INST_FOREACH_STEP4, infoIndex, envPtr); offsetFwd = CurrentOffset(envPtr); TclEmitInstInt1(INST_JUMP_FALSE1, 0, envPtr); savedStackDepth = envPtr->currStackDepth; Emit14Inst( INST_LOAD_SCALAR, keyVar, envPtr); Emit14Inst( INST_LOAD_SCALAR, valVar, envPtr); Emit14Inst( INST_STORE_ARRAY, localIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); back = offsetBack - CurrentOffset(envPtr); TclEmitInstInt1(INST_JUMP1, back, envPtr); fwd = CurrentOffset(envPtr) - offsetFwd; TclStoreInt1AtPtr(fwd, envPtr->codeStart+offsetFwd+1); envPtr->currStackDepth = savedStackDepth; } else { TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_ARRAY_EXISTS_STK, envPtr); TclEmitInstInt1(INST_JUMP_TRUE1, 4, envPtr); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_ARRAY_MAKE_STK, envPtr); TclEmitInstInt4(INST_FOREACH_START4, infoIndex, envPtr); offsetBack = CurrentOffset(envPtr); TclEmitInstInt4(INST_FOREACH_STEP4, infoIndex, envPtr); offsetFwd = CurrentOffset(envPtr); TclEmitInstInt1(INST_JUMP_FALSE1, 0, envPtr); savedStackDepth = envPtr->currStackDepth; TclEmitOpcode( INST_DUP, envPtr); Emit14Inst( INST_LOAD_SCALAR, keyVar, envPtr); Emit14Inst( INST_LOAD_SCALAR, valVar, envPtr); TclEmitOpcode( INST_STORE_ARRAY_STK, envPtr); TclEmitOpcode( INST_POP, envPtr); back = offsetBack - CurrentOffset(envPtr); TclEmitInstInt1(INST_JUMP1, back, envPtr); fwd = CurrentOffset(envPtr) - offsetFwd; TclStoreInt1AtPtr(fwd, envPtr->codeStart+offsetFwd+1); envPtr->currStackDepth = savedStackDepth; TclEmitOpcode( INST_POP, envPtr); } TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( dataVar, envPtr); PushLiteral(envPtr, "", 0); return TCL_OK; } int TclCompileArrayUnsetCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr); int simpleVarName, isScalar, localIndex, savedStackDepth; if (parsePtr->numWords != 2) { return TCL_ERROR; } PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); if (!isScalar) { return TCL_ERROR; } if (localIndex >= 0) { TclEmitInstInt4(INST_ARRAY_EXISTS_IMM, localIndex, envPtr); TclEmitInstInt1(INST_JUMP_FALSE1, 8, envPtr); TclEmitInstInt1(INST_UNSET_SCALAR, 1, envPtr); TclEmitInt4( localIndex, envPtr); } else { TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_ARRAY_EXISTS_STK, envPtr); TclEmitInstInt1(INST_JUMP_FALSE1, 6, envPtr); savedStackDepth = envPtr->currStackDepth; TclEmitInstInt1(INST_UNSET_STK, 1, envPtr); TclEmitInstInt1(INST_JUMP1, 3, envPtr); envPtr->currStackDepth = savedStackDepth; TclEmitOpcode( INST_POP, envPtr); } PushLiteral(envPtr, "", 0); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileBreakCmd -- * * Procedure called to compile the "break" command. * * 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 "break" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileBreakCmd( 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. */ { if (parsePtr->numWords != 1) { return TCL_ERROR; } /* * Emit a break instruction. */ TclEmitOpcode(INST_BREAK, envPtr); PushLiteral(envPtr, "", 0); /* Evil hack! */ return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileCatchCmd -- * * Procedure called to compile the "catch" command. * * 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 "catch" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileCatchCmd( 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. */ { JumpFixup jumpFixup; Tcl_Token *cmdTokenPtr, *resultNameTokenPtr, *optsNameTokenPtr; const char *name; int resultIndex, optsIndex, nameChars, range; int initStackDepth = envPtr->currStackDepth; int savedStackDepth; DefineLineInformation; /* TIP #280 */ /* * If syntax does not match what we expect for [catch], do not compile. * Let runtime checks determine if syntax has changed. */ if ((parsePtr->numWords < 2) || (parsePtr->numWords > 4)) { return TCL_ERROR; } /* * If variables were specified and the catch command is at global level * (not in a procedure), don't compile it inline: the payoff is too small. */ if ((parsePtr->numWords >= 3) && !EnvHasLVT(envPtr)) { return TCL_ERROR; } /* * Make sure the variable names, if any, have no substitutions and just * refer to local scalars. */ resultIndex = optsIndex = -1; cmdTokenPtr = TokenAfter(parsePtr->tokenPtr); if (parsePtr->numWords >= 3) { resultNameTokenPtr = TokenAfter(cmdTokenPtr); /* DGP */ if (resultNameTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = resultNameTokenPtr[1].start; nameChars = resultNameTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } resultIndex = TclFindCompiledLocal(resultNameTokenPtr[1].start, resultNameTokenPtr[1].size, /*create*/ 1, envPtr); if (resultIndex < 0) { return TCL_ERROR; } /* DKF */ if (parsePtr->numWords == 4) { optsNameTokenPtr = TokenAfter(resultNameTokenPtr); if (optsNameTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = optsNameTokenPtr[1].start; nameChars = optsNameTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } optsIndex = TclFindCompiledLocal(optsNameTokenPtr[1].start, optsNameTokenPtr[1].size, /*create*/ 1, envPtr); if (optsIndex < 0) { return TCL_ERROR; } } } /* * We will compile the catch command. Declare the exception range that it * uses. */ range = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE); /* * If the body is a simple word, compile a BEGIN_CATCH instruction, * followed by the instructions to eval the body. * Otherwise, compile instructions to substitute the body text before * starting the catch, then BEGIN_CATCH, and then EVAL_STK to evaluate the * substituted body. * Care has to be taken to make sure that substitution happens outside the * catch range so that errors in the substitution are not caught. * [Bug 219184] * The reason for duplicating the script is that EVAL_STK would otherwise * begin by undeflowing the stack below the mark set by BEGIN_CATCH4. */ SetLineInformation(1); if (cmdTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { savedStackDepth = envPtr->currStackDepth; TclEmitInstInt4( INST_BEGIN_CATCH4, range, envPtr); ExceptionRangeStarts(envPtr, range); CompileBody(envPtr, cmdTokenPtr, interp); } else { CompileTokens(envPtr, cmdTokenPtr, interp); savedStackDepth = envPtr->currStackDepth; TclEmitInstInt4( INST_BEGIN_CATCH4, range, envPtr); ExceptionRangeStarts(envPtr, range); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_EVAL_STK, envPtr); } /* Stack at this point: * nonsimple: script result * simple: result */ if (resultIndex == -1) { /* * Special case when neither result nor options are being saved. In * that case, we can skip quite a bit of the command epilogue; all we * have to do is drop the result and push the return code (and, of * course, finish the catch context). */ TclEmitOpcode( INST_POP, envPtr); PushLiteral(envPtr, "0", 1); TclEmitInstInt1( INST_JUMP1, 3, envPtr); envPtr->currStackDepth = savedStackDepth; ExceptionRangeTarget(envPtr, range, catchOffset); TclEmitOpcode( INST_PUSH_RETURN_CODE, envPtr); ExceptionRangeEnds(envPtr, range); TclEmitOpcode( INST_END_CATCH, envPtr); /* * Stack at this point: * nonsimple: script returnCode * simple: returnCode */ goto dropScriptAtEnd; } /* * Emit the "no errors" epilogue: push "0" (TCL_OK) as the catch result, * and jump around the "error case" code. */ PushLiteral(envPtr, "0", 1); TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpFixup); /* Stack at this point: ?script? result TCL_OK */ /* * Emit the "error case" epilogue. Push the interpreter result and the * return code. */ envPtr->currStackDepth = savedStackDepth; ExceptionRangeTarget(envPtr, range, catchOffset); /* Stack at this point: ?script? */ TclEmitOpcode( INST_PUSH_RESULT, envPtr); TclEmitOpcode( INST_PUSH_RETURN_CODE, envPtr); /* * Update the target of the jump after the "no errors" code. */ /* Stack at this point: ?script? result returnCode */ if (TclFixupForwardJumpToHere(envPtr, &jumpFixup, 127)) { Tcl_Panic("TclCompileCatchCmd: bad jump distance %d", (int)(CurrentOffset(envPtr) - jumpFixup.codeOffset)); } /* * Push the return options if the caller wants them. */ if (optsIndex != -1) { TclEmitOpcode( INST_PUSH_RETURN_OPTIONS, envPtr); } /* * End the catch */ ExceptionRangeEnds(envPtr, range); TclEmitOpcode( INST_END_CATCH, envPtr); /* * At this point, the top of the stack is inconveniently ordered: * ?script? result returnCode ?returnOptions? * Reverse the stack to bring the result to the top. */ if (optsIndex != -1) { TclEmitInstInt4( INST_REVERSE, 3, envPtr); } else { TclEmitInstInt4( INST_REVERSE, 2, envPtr); } /* * Store the result and remove it from the stack. */ Emit14Inst( INST_STORE_SCALAR, resultIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); /* * Stack is now ?script? ?returnOptions? returnCode. * If the options dict has been requested, it is buried on the stack under * the return code. Reverse the stack to bring it to the top, store it and * remove it from the stack. */ if (optsIndex != -1) { TclEmitInstInt4( INST_REVERSE, 2, envPtr); Emit14Inst( INST_STORE_SCALAR, optsIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); } dropScriptAtEnd: /* * Stack is now ?script? result. Get rid of the subst'ed script if it's * hanging arond. */ if (cmdTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { TclEmitInstInt4( INST_REVERSE, 2, envPtr); TclEmitOpcode( INST_POP, envPtr); } /* * Result of all this, on either branch, should have been to leave one * operand -- the return code -- on the stack. */ if (envPtr->currStackDepth != initStackDepth + 1) { Tcl_Panic("in TclCompileCatchCmd, currStackDepth = %d should be %d", envPtr->currStackDepth, initStackDepth+1); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileContinueCmd -- * * Procedure called to compile the "continue" command. * * 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 "continue" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileContinueCmd( 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. */ { /* * There should be no argument after the "continue". */ if (parsePtr->numWords != 1) { return TCL_ERROR; } /* * Emit a continue instruction. */ TclEmitOpcode(INST_CONTINUE, envPtr); PushLiteral(envPtr, "", 0); /* Evil hack! */ return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileDict*Cmd -- * * Functions called to compile "dict" sucommands. * * Results: * All return TCL_OK for a successful compile, and TCL_ERROR to defer * evaluation to runtime. * * Side effects: * Instructions are added to envPtr to execute the "dict" subcommand at * runtime. * *---------------------------------------------------------------------- */ int TclCompileDictSetCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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; int numWords, i; DefineLineInformation; /* TIP #280 */ Tcl_Token *varTokenPtr; int dictVarIndex, nameChars; const char *name; /* * There must be at least one argument after the command. */ if (parsePtr->numWords < 4) { return TCL_ERROR; } /* * The dictionary variable must be a local scalar that is knowable at * compile time; anything else exceeds the complexity of the opcode. So * discover what the index is. */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); if (varTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = varTokenPtr[1].start; nameChars = varTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictVarIndex < 0) { return TCL_ERROR; } /* * Remaining words (key path and value to set) can be handled normally. */ tokenPtr = TokenAfter(varTokenPtr); numWords = parsePtr->numWords-1; for (i=1 ; inumWords < 3 || parsePtr->numWords > 4) { return TCL_ERROR; } varTokenPtr = TokenAfter(parsePtr->tokenPtr); keyTokenPtr = TokenAfter(varTokenPtr); /* * Parse the increment amount, if present. */ if (parsePtr->numWords == 4) { const char *word; int numBytes, code; Tcl_Token *incrTokenPtr; Tcl_Obj *intObj; incrTokenPtr = TokenAfter(keyTokenPtr); if (incrTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } word = incrTokenPtr[1].start; numBytes = incrTokenPtr[1].size; intObj = Tcl_NewStringObj(word, numBytes); Tcl_IncrRefCount(intObj); code = TclGetIntFromObj(NULL, intObj, &incrAmount); TclDecrRefCount(intObj); if (code != TCL_OK) { return TCL_ERROR; } } else { incrAmount = 1; } /* * The dictionary variable must be a local scalar that is knowable at * compile time; anything else exceeds the complexity of the opcode. So * discover what the index is. */ if (varTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = varTokenPtr[1].start; nameChars = varTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictVarIndex < 0) { return TCL_ERROR; } /* * Emit the key and the code to actually do the increment. */ CompileWord(envPtr, keyTokenPtr, interp, 3); TclEmitInstInt4( INST_DICT_INCR_IMM, incrAmount, envPtr); TclEmitInt4( dictVarIndex, envPtr); return TCL_OK; } int TclCompileDictGetCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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; int numWords, i; DefineLineInformation; /* TIP #280 */ /* * There must be at least two arguments after the command (the single-arg * case is legal, but too special and magic for us to deal with here). */ if (parsePtr->numWords < 3) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); numWords = parsePtr->numWords-1; /* * Only compile this because we need INST_DICT_GET anyway. */ for (i=0 ; inumWords < 3) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); numWords = parsePtr->numWords-1; /* * Now we do the code generation. */ for (i=0 ; inumWords < 3) { return TCL_ERROR; } /* * The dictionary variable must be a local scalar that is knowable at * compile time; anything else exceeds the complexity of the opcode. So * discover what the index is. */ tokenPtr = TokenAfter(parsePtr->tokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = tokenPtr[1].start; nameChars = tokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictVarIndex < 0) { return TCL_ERROR; } /* * Remaining words (the key path) can be handled normally. */ for (i=2 ; inumWords ; i++) { tokenPtr = TokenAfter(tokenPtr); CompileWord(envPtr, tokenPtr, interp, i); } /* * Now emit the instruction to do the dict manipulation. */ TclEmitInstInt4( INST_DICT_UNSET, parsePtr->numWords-2, envPtr); TclEmitInt4( dictVarIndex, envPtr); return TCL_OK; } int TclCompileDictCreateCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ int worker; /* Temp var for building the value in. */ Tcl_Token *tokenPtr; Tcl_Obj *keyObj, *valueObj, *dictObj; const char *bytes; int i, len; if ((parsePtr->numWords & 1) == 0) { return TCL_ERROR; } /* * See if we can build the value at compile time... */ tokenPtr = TokenAfter(parsePtr->tokenPtr); dictObj = Tcl_NewObj(); Tcl_IncrRefCount(dictObj); for (i=1 ; inumWords ; i+=2) { keyObj = Tcl_NewObj(); Tcl_IncrRefCount(keyObj); if (!TclWordKnownAtCompileTime(tokenPtr, keyObj)) { Tcl_DecrRefCount(keyObj); Tcl_DecrRefCount(dictObj); goto nonConstant; } tokenPtr = TokenAfter(tokenPtr); valueObj = Tcl_NewObj(); Tcl_IncrRefCount(valueObj); if (!TclWordKnownAtCompileTime(tokenPtr, valueObj)) { Tcl_DecrRefCount(keyObj); Tcl_DecrRefCount(valueObj); Tcl_DecrRefCount(dictObj); goto nonConstant; } tokenPtr = TokenAfter(tokenPtr); Tcl_DictObjPut(NULL, dictObj, keyObj, valueObj); Tcl_DecrRefCount(keyObj); Tcl_DecrRefCount(valueObj); } /* * We did! Excellent. The "verifyDict" is to do type forcing. */ bytes = Tcl_GetStringFromObj(dictObj, &len); PushLiteral(envPtr, bytes, len); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_DICT_VERIFY, envPtr); Tcl_DecrRefCount(dictObj); return TCL_OK; /* * Otherwise, we've got to issue runtime code to do the building, which we * do by [dict set]ting into an unnamed local variable. This requires that * we are in a context with an LVT. */ nonConstant: worker = TclFindCompiledLocal(NULL, 0, 1, envPtr); if (worker < 0) { return TCL_ERROR; } PushLiteral(envPtr, "", 0); Emit14Inst( INST_STORE_SCALAR, worker, envPtr); TclEmitOpcode( INST_POP, envPtr); tokenPtr = TokenAfter(parsePtr->tokenPtr); for (i=1 ; inumWords ; i+=2) { CompileWord(envPtr, tokenPtr, interp, i); tokenPtr = TokenAfter(tokenPtr); CompileWord(envPtr, tokenPtr, interp, i+1); tokenPtr = TokenAfter(tokenPtr); TclEmitInstInt4( INST_DICT_SET, 1, envPtr); TclEmitInt4( worker, envPtr); TclAdjustStackDepth(-1, envPtr); TclEmitOpcode( INST_POP, envPtr); } Emit14Inst( INST_LOAD_SCALAR, worker, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( worker, envPtr); return TCL_OK; } int TclCompileDictMergeCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr; int i, workerIndex, infoIndex, outLoop; /* * Deal with some special edge cases. Note that in the case with one * argument, the only thing to do is to verify the dict-ness. */ if (parsePtr->numWords < 2) { PushLiteral(envPtr, "", 0); return TCL_OK; } else if (parsePtr->numWords == 2) { tokenPtr = TokenAfter(parsePtr->tokenPtr); CompileWord(envPtr, tokenPtr, interp, 1); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_DICT_VERIFY, envPtr); return TCL_OK; } /* * There's real merging work to do. * * Allocate some working space. This means we'll only ever compile this * command when there's an LVT present. */ workerIndex = TclFindCompiledLocal(NULL, 0, 1, envPtr); if (workerIndex < 0) { return TCL_ERROR; } infoIndex = TclFindCompiledLocal(NULL, 0, 1, envPtr); /* * Get the first dictionary and verify that it is so. */ tokenPtr = TokenAfter(parsePtr->tokenPtr); CompileWord(envPtr, tokenPtr, interp, 1); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_DICT_VERIFY, envPtr); Emit14Inst( INST_STORE_SCALAR, workerIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); /* * For each of the remaining dictionaries... */ outLoop = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE); TclEmitInstInt4( INST_BEGIN_CATCH4, outLoop, envPtr); ExceptionRangeStarts(envPtr, outLoop); for (i=2 ; inumWords ; i++) { /* * Get the dictionary, and merge its pairs into the first dict (using * a small loop). */ tokenPtr = TokenAfter(tokenPtr); CompileWord(envPtr, tokenPtr, interp, i); TclEmitInstInt4( INST_DICT_FIRST, infoIndex, envPtr); TclEmitInstInt1( INST_JUMP_TRUE1, 24, envPtr); TclEmitInstInt4( INST_REVERSE, 2, envPtr); TclEmitInstInt4( INST_DICT_SET, 1, envPtr); TclEmitInt4( workerIndex, envPtr); TclAdjustStackDepth(-1, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitInstInt4( INST_DICT_NEXT, infoIndex, envPtr); TclEmitInstInt1( INST_JUMP_FALSE1, -20, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( infoIndex, envPtr); } ExceptionRangeEnds(envPtr, outLoop); TclEmitOpcode( INST_END_CATCH, envPtr); /* * Clean up any state left over. */ Emit14Inst( INST_LOAD_SCALAR, workerIndex, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( workerIndex, envPtr); TclEmitInstInt1( INST_JUMP1, 18, envPtr); /* * If an exception happens when starting to iterate over the second (and * subsequent) dicts. This is strictly not necessary, but it is nice. */ ExceptionRangeTarget(envPtr, outLoop, catchOffset); TclEmitOpcode( INST_PUSH_RETURN_OPTIONS, envPtr); TclEmitOpcode( INST_PUSH_RESULT, envPtr); TclEmitOpcode( INST_END_CATCH, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( workerIndex, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( infoIndex, envPtr); TclEmitOpcode( INST_RETURN_STK, envPtr); return TCL_OK; } int TclCompileDictForCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { return CompileDictEachCmd(interp, parsePtr, cmdPtr, envPtr, TCL_EACH_KEEP_NONE); } int TclCompileDictMapCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { return CompileDictEachCmd(interp, parsePtr, cmdPtr, envPtr, TCL_EACH_COLLECT); } int CompileDictEachCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ int collect) /* Flag == TCL_EACH_COLLECT to collect and * construct a new dictionary with the loop * body result. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *varsTokenPtr, *dictTokenPtr, *bodyTokenPtr; int keyVarIndex, valueVarIndex, nameChars, loopRange, catchRange; int infoIndex, jumpDisplacement, bodyTargetOffset, emptyTargetOffset; int numVars, endTargetOffset; int collectVar = -1; /* Index of temp var holding the result * dict. */ int savedStackDepth = envPtr->currStackDepth; /* Needed because jumps confuse the stack * space calculator. */ const char **argv; Tcl_DString buffer; /* * There must be at least three argument after the command. */ if (parsePtr->numWords != 4) { return TCL_ERROR; } varsTokenPtr = TokenAfter(parsePtr->tokenPtr); dictTokenPtr = TokenAfter(varsTokenPtr); bodyTokenPtr = TokenAfter(dictTokenPtr); if (varsTokenPtr->type != TCL_TOKEN_SIMPLE_WORD || bodyTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } /* * Create temporary variable to capture return values from loop body when * we're collecting results. */ if (collect == TCL_EACH_COLLECT) { collectVar = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1, envPtr); if (collectVar < 0) { return TCL_ERROR; } } /* * Check we've got a pair of variables and that they are local variables. * Then extract their indices in the LVT. */ Tcl_DStringInit(&buffer); TclDStringAppendToken(&buffer, &varsTokenPtr[1]); if (Tcl_SplitList(NULL, Tcl_DStringValue(&buffer), &numVars, &argv) != TCL_OK) { Tcl_DStringFree(&buffer); return TCL_ERROR; } Tcl_DStringFree(&buffer); if (numVars != 2) { ckfree(argv); return TCL_ERROR; } nameChars = strlen(argv[0]); if (!TclIsLocalScalar(argv[0], nameChars)) { ckfree(argv); return TCL_ERROR; } keyVarIndex = TclFindCompiledLocal(argv[0], nameChars, 1, envPtr); nameChars = strlen(argv[1]); if (!TclIsLocalScalar(argv[1], nameChars)) { ckfree(argv); return TCL_ERROR; } valueVarIndex = TclFindCompiledLocal(argv[1], nameChars, 1, envPtr); ckfree(argv); if ((keyVarIndex < 0) || (valueVarIndex < 0)) { return TCL_ERROR; } /* * Allocate a temporary variable to store the iterator reference. The * variable will contain a Tcl_DictSearch reference which will be * allocated by INST_DICT_FIRST and disposed when the variable is unset * (at which point it should also have been finished with). */ infoIndex = TclFindCompiledLocal(NULL, 0, 1, envPtr); if (infoIndex < 0) { return TCL_ERROR; } /* * Preparation complete; issue instructions. Note that this code issues * fixed-sized jumps. That simplifies things a lot! * * First up, initialize the accumulator dictionary if needed. */ if (collect == TCL_EACH_COLLECT) { PushLiteral(envPtr, "", 0); Emit14Inst( INST_STORE_SCALAR, collectVar, envPtr); TclEmitOpcode( INST_POP, envPtr); } /* * Get the dictionary and start the iteration. No catching of errors at * this point. */ CompileWord(envPtr, dictTokenPtr, interp, 3); TclEmitInstInt4( INST_DICT_FIRST, infoIndex, envPtr); emptyTargetOffset = CurrentOffset(envPtr); TclEmitInstInt4( INST_JUMP_TRUE4, 0, envPtr); /* * Now we catch errors from here on so that we can finalize the search * started by Tcl_DictObjFirst above. */ catchRange = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE); TclEmitInstInt4( INST_BEGIN_CATCH4, catchRange, envPtr); ExceptionRangeStarts(envPtr, catchRange); /* * Inside the iteration, write the loop variables. */ bodyTargetOffset = CurrentOffset(envPtr); Emit14Inst( INST_STORE_SCALAR, keyVarIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); Emit14Inst( INST_STORE_SCALAR, valueVarIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); /* * Set up the loop exception targets. */ loopRange = DeclareExceptionRange(envPtr, LOOP_EXCEPTION_RANGE); ExceptionRangeStarts(envPtr, loopRange); /* * Compile the loop body itself. It should be stack-neutral. */ SetLineInformation(3); CompileBody(envPtr, bodyTokenPtr, interp); if (collect == TCL_EACH_COLLECT) { Emit14Inst( INST_LOAD_SCALAR, keyVarIndex, envPtr); TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitInstInt4(INST_DICT_SET, 1, envPtr); TclEmitInt4( collectVar, envPtr); TclAdjustStackDepth(-1, envPtr); TclEmitOpcode( INST_POP, envPtr); } TclEmitOpcode( INST_POP, envPtr); /* * Both exception target ranges (error and loop) end here. */ ExceptionRangeEnds(envPtr, loopRange); ExceptionRangeEnds(envPtr, catchRange); /* * Continue (or just normally process) by getting the next pair of items * from the dictionary and jumping back to the code to write them into * variables if there is another pair. */ ExceptionRangeTarget(envPtr, loopRange, continueOffset); TclEmitInstInt4( INST_DICT_NEXT, infoIndex, envPtr); jumpDisplacement = bodyTargetOffset - CurrentOffset(envPtr); TclEmitInstInt4( INST_JUMP_FALSE4, jumpDisplacement, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitOpcode( INST_POP, envPtr); /* * Now do the final cleanup for the no-error case (this is where we break * out of the loop to) by force-terminating the iteration (if not already * terminated), ditching the exception info and jumping to the last * instruction for this command. In theory, this could be done using the * "finally" clause (next generated) but this is faster. */ ExceptionRangeTarget(envPtr, loopRange, breakOffset); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( infoIndex, envPtr); TclEmitOpcode( INST_END_CATCH, envPtr); endTargetOffset = CurrentOffset(envPtr); TclEmitInstInt4( INST_JUMP4, 0, envPtr); /* * Error handler "finally" clause, which force-terminates the iteration * and rethrows the error. */ ExceptionRangeTarget(envPtr, catchRange, catchOffset); TclEmitOpcode( INST_PUSH_RETURN_OPTIONS, envPtr); TclEmitOpcode( INST_PUSH_RESULT, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( infoIndex, envPtr); TclEmitOpcode( INST_END_CATCH, envPtr); if (collect == TCL_EACH_COLLECT) { TclEmitInstInt1(INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( collectVar, envPtr); } TclEmitOpcode( INST_RETURN_STK, envPtr); /* * Otherwise we're done (the jump after the DICT_FIRST points here) and we * need to pop the bogus key/value pair (pushed to keep stack calculations * easy!) Note that we skip the END_CATCH. [Bug 1382528] */ envPtr->currStackDepth = savedStackDepth + 2; jumpDisplacement = CurrentOffset(envPtr) - emptyTargetOffset; TclUpdateInstInt4AtPc(INST_JUMP_TRUE4, jumpDisplacement, envPtr->codeStart + emptyTargetOffset); TclEmitOpcode( INST_POP, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitInstInt1( INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( infoIndex, envPtr); /* * Final stage of the command (normal case) is that we push an empty * object (or push the accumulator as the result object). This is done * last to promote peephole optimization when it's dropped immediately. */ jumpDisplacement = CurrentOffset(envPtr) - endTargetOffset; TclUpdateInstInt4AtPc(INST_JUMP4, jumpDisplacement, envPtr->codeStart + endTargetOffset); if (collect == TCL_EACH_COLLECT) { Emit14Inst( INST_LOAD_SCALAR, collectVar, envPtr); TclEmitInstInt1(INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( collectVar, envPtr); } else { PushLiteral(envPtr, "", 0); } return TCL_OK; } int TclCompileDictUpdateCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ const char *name; int i, nameChars, dictIndex, numVars, range, infoIndex; Tcl_Token **keyTokenPtrs, *dictVarTokenPtr, *bodyTokenPtr, *tokenPtr; int savedStackDepth = envPtr->currStackDepth; DictUpdateInfo *duiPtr; JumpFixup jumpFixup; /* * There must be at least one argument after the command. */ if (parsePtr->numWords < 5) { return TCL_ERROR; } /* * Parse the command. Expect the following: * dict update ? ...? */ if ((parsePtr->numWords - 1) & 1) { return TCL_ERROR; } numVars = (parsePtr->numWords - 3) / 2; /* * The dictionary variable must be a local scalar that is knowable at * compile time; anything else exceeds the complexity of the opcode. So * discover what the index is. */ dictVarTokenPtr = TokenAfter(parsePtr->tokenPtr); if (dictVarTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = dictVarTokenPtr[1].start; nameChars = dictVarTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictIndex < 0) { return TCL_ERROR; } /* * Assemble the instruction metadata. This is complex enough that it is * represented as auxData; it holds an ordered list of variable indices * that are to be used. */ duiPtr = ckalloc(sizeof(DictUpdateInfo) + sizeof(int) * (numVars - 1)); duiPtr->length = numVars; keyTokenPtrs = TclStackAlloc(interp, sizeof(Tcl_Token *) * numVars); tokenPtr = TokenAfter(dictVarTokenPtr); for (i=0 ; itype != TCL_TOKEN_SIMPLE_WORD) { goto failedUpdateInfoAssembly; } name = tokenPtr[1].start; nameChars = tokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { goto failedUpdateInfoAssembly; } /* * Stash the index in the auxiliary data. */ duiPtr->varIndices[i] = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (duiPtr->varIndices[i] < 0) { goto failedUpdateInfoAssembly; } tokenPtr = TokenAfter(tokenPtr); } if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { failedUpdateInfoAssembly: ckfree(duiPtr); TclStackFree(interp, keyTokenPtrs); return TCL_ERROR; } bodyTokenPtr = tokenPtr; /* * The list of variables to bind is stored in auxiliary data so that it * can't be snagged by literal sharing and forced to shimmer dangerously. */ infoIndex = TclCreateAuxData(duiPtr, &tclDictUpdateInfoType, envPtr); for (i=0 ; icurrStackDepth++; SetLineInformation(parsePtr->numWords - 1); CompileBody(envPtr, bodyTokenPtr, interp); envPtr->currStackDepth = savedStackDepth; ExceptionRangeEnds(envPtr, range); /* * Normal termination code: the stack has the key list below the result of * the body evaluation: swap them and finish the update code. */ TclEmitOpcode( INST_END_CATCH, envPtr); TclEmitInstInt4( INST_REVERSE, 2, envPtr); TclEmitInstInt4( INST_DICT_UPDATE_END, dictIndex, envPtr); TclEmitInt4( infoIndex, envPtr); /* * Jump around the exceptional termination code. */ TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpFixup); /* * Termination code for non-ok returns: stash the result and return * options in the stack, bring up the key list, finish the update code, * and finally return with the catched return data */ ExceptionRangeTarget(envPtr, range, catchOffset); TclEmitOpcode( INST_PUSH_RESULT, envPtr); TclEmitOpcode( INST_PUSH_RETURN_OPTIONS, envPtr); TclEmitOpcode( INST_END_CATCH, envPtr); TclEmitInstInt4( INST_REVERSE, 3, envPtr); TclEmitInstInt4( INST_DICT_UPDATE_END, dictIndex, envPtr); TclEmitInt4( infoIndex, envPtr); TclEmitOpcode( INST_RETURN_STK, envPtr); if (TclFixupForwardJumpToHere(envPtr, &jumpFixup, 127)) { Tcl_Panic("TclCompileDictCmd(update): bad jump distance %d", (int) (CurrentOffset(envPtr) - jumpFixup.codeOffset)); } TclStackFree(interp, keyTokenPtrs); envPtr->currStackDepth = savedStackDepth + 1; return TCL_OK; } int TclCompileDictAppendCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr; int i, dictVarIndex; /* * There must be at least two argument after the command. And we impose an * (arbirary) safe limit; anyone exceeding it should stop worrying about * speed quite so much. ;-) */ if (parsePtr->numWords<4 || parsePtr->numWords>100) { return TCL_ERROR; } /* * Get the index of the local variable that we will be working with. */ tokenPtr = TokenAfter(parsePtr->tokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } else { register const char *name = tokenPtr[1].start; register int nameChars = tokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictVarIndex < 0) { return TCL_ERROR; } } /* * Produce the string to concatenate onto the dictionary entry. */ tokenPtr = TokenAfter(tokenPtr); for (i=2 ; inumWords ; i++) { CompileWord(envPtr, tokenPtr, interp, i); tokenPtr = TokenAfter(tokenPtr); } if (parsePtr->numWords > 4) { TclEmitInstInt1(INST_CONCAT1, parsePtr->numWords-3, envPtr); } /* * Do the concatenation. */ TclEmitInstInt4(INST_DICT_APPEND, dictVarIndex, envPtr); return TCL_OK; } int TclCompileDictLappendCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *varTokenPtr, *keyTokenPtr, *valueTokenPtr; int dictVarIndex, nameChars; const char *name; /* * There must be three arguments after the command. */ if (parsePtr->numWords != 4) { return TCL_ERROR; } varTokenPtr = TokenAfter(parsePtr->tokenPtr); keyTokenPtr = TokenAfter(varTokenPtr); valueTokenPtr = TokenAfter(keyTokenPtr); if (varTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } name = varTokenPtr[1].start; nameChars = varTokenPtr[1].size; if (!TclIsLocalScalar(name, nameChars)) { return TCL_ERROR; } dictVarIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if (dictVarIndex < 0) { return TCL_ERROR; } CompileWord(envPtr, keyTokenPtr, interp, 3); CompileWord(envPtr, valueTokenPtr, interp, 4); TclEmitInstInt4( INST_DICT_LAPPEND, dictVarIndex, envPtr); return TCL_OK; } int TclCompileDictWithCmd( Tcl_Interp *interp, /* Used for looking up stuff. */ 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. */ { DefineLineInformation; /* TIP #280 */ int i, range, varNameTmp, pathTmp, keysTmp, gotPath, dictVar = -1; int bodyIsEmpty = 1; Tcl_Token *varTokenPtr, *tokenPtr; int savedStackDepth = envPtr->currStackDepth; JumpFixup jumpFixup; const char *ptr, *end; /* * There must be at least one argument after the command. */ if (parsePtr->numWords < 3) { return TCL_ERROR; } /* * Parse the command (trivially). Expect the following: * dict with ? ...? */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); tokenPtr = TokenAfter(varTokenPtr); for (i=3 ; inumWords ; i++) { tokenPtr = TokenAfter(tokenPtr); } if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } /* * Test if the last word is an empty script; if so, we can compile it in * all cases, but if it is non-empty we need local variable table entries * to hold the temporary variables (used to keep stack usage simple). */ for (ptr=tokenPtr[1].start,end=ptr+tokenPtr[1].size ; ptr!=end ; ptr++) { if (*ptr!=' ' && *ptr!='\t' && *ptr!='\n' && *ptr!='\r') { if (envPtr->procPtr == NULL) { return TCL_ERROR; } bodyIsEmpty = 0; break; } } /* * Determine if we're manipulating a dict in a simple local variable. */ gotPath = (parsePtr->numWords > 3); if (varTokenPtr->type == TCL_TOKEN_SIMPLE_WORD && TclIsLocalScalar(varTokenPtr[1].start, varTokenPtr[1].size)) { dictVar = TclFindCompiledLocal(varTokenPtr[1].start, varTokenPtr[1].size, 1, envPtr); } /* * Special case: an empty body means we definitely have no need to issue * try-finally style code or to allocate local variable table entries for * storing temporaries. Still need to do both INST_DICT_EXPAND and * INST_DICT_RECOMBINE_* though, because we can't determine if we're free * of traces. */ if (bodyIsEmpty) { if (dictVar >= 0) { if (gotPath) { /* * Case: Path into dict in LVT with empty body. */ tokenPtr = TokenAfter(varTokenPtr); for (i=2 ; inumWords-1 ; i++) { CompileWord(envPtr, tokenPtr, interp, i-1); tokenPtr = TokenAfter(tokenPtr); } TclEmitInstInt4(INST_LIST, parsePtr->numWords-3,envPtr); Emit14Inst( INST_LOAD_SCALAR, dictVar, envPtr); TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitOpcode( INST_DICT_EXPAND, envPtr); TclEmitInstInt4(INST_DICT_RECOMBINE_IMM, dictVar, envPtr); PushLiteral(envPtr, "", 0); } else { /* * Case: Direct dict in LVT with empty body. */ PushLiteral(envPtr, "", 0); Emit14Inst( INST_LOAD_SCALAR, dictVar, envPtr); PushLiteral(envPtr, "", 0); TclEmitOpcode( INST_DICT_EXPAND, envPtr); TclEmitInstInt4(INST_DICT_RECOMBINE_IMM, dictVar, envPtr); PushLiteral(envPtr, "", 0); } } else { if (gotPath) { /* * Case: Path into dict in non-simple var with empty body. */ tokenPtr = varTokenPtr; for (i=1 ; inumWords-1 ; i++) { CompileWord(envPtr, tokenPtr, interp, i-1); tokenPtr = TokenAfter(tokenPtr); } TclEmitInstInt4(INST_LIST, parsePtr->numWords-3,envPtr); TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitOpcode( INST_LOAD_STK, envPtr); TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitOpcode( INST_DICT_EXPAND, envPtr); TclEmitOpcode( INST_DICT_RECOMBINE_STK, envPtr); PushLiteral(envPtr, "", 0); } else { /* * Case: Direct dict in non-simple var with empty body. */ CompileWord(envPtr, varTokenPtr, interp, 0); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_LOAD_STK, envPtr); PushLiteral(envPtr, "", 0); TclEmitOpcode( INST_DICT_EXPAND, envPtr); PushLiteral(envPtr, "", 0); TclEmitInstInt4(INST_REVERSE, 2, envPtr); TclEmitOpcode( INST_DICT_RECOMBINE_STK, envPtr); PushLiteral(envPtr, "", 0); } } envPtr->currStackDepth = savedStackDepth + 1; return TCL_OK; } /* * OK, we have a non-trivial body. This means that the focus is on * generating a try-finally structure where the INST_DICT_RECOMBINE_* goes * in the 'finally' clause. * * Start by allocating local (unnamed, untraced) working variables. */ if (dictVar == -1) { varNameTmp = TclFindCompiledLocal(NULL, 0, 1, envPtr); } else { varNameTmp = -1; } if (gotPath) { pathTmp = TclFindCompiledLocal(NULL, 0, 1, envPtr); } else { pathTmp = -1; } keysTmp = TclFindCompiledLocal(NULL, 0, 1, envPtr); /* * Issue instructions. First, the part to expand the dictionary. */ if (varNameTmp > -1) { CompileWord(envPtr, varTokenPtr, interp, 0); Emit14Inst( INST_STORE_SCALAR, varNameTmp, envPtr); } tokenPtr = TokenAfter(varTokenPtr); if (gotPath) { for (i=2 ; inumWords-1 ; i++) { CompileWord(envPtr, tokenPtr, interp, i-1); tokenPtr = TokenAfter(tokenPtr); } TclEmitInstInt4( INST_LIST, parsePtr->numWords-3,envPtr); Emit14Inst( INST_STORE_SCALAR, pathTmp, envPtr); TclEmitOpcode( INST_POP, envPtr); } if (dictVar == -1) { TclEmitOpcode( INST_LOAD_STK, envPtr); } else { Emit14Inst( INST_LOAD_SCALAR, dictVar, envPtr); } if (gotPath) { Emit14Inst( INST_LOAD_SCALAR, pathTmp, envPtr); } else { PushLiteral(envPtr, "", 0); } TclEmitOpcode( INST_DICT_EXPAND, envPtr); Emit14Inst( INST_STORE_SCALAR, keysTmp, envPtr); TclEmitOpcode( INST_POP, envPtr); /* * Now the body of the [dict with]. */ range = DeclareExceptionRange(envPtr, CATCH_EXCEPTION_RANGE); TclEmitInstInt4( INST_BEGIN_CATCH4, range, envPtr); ExceptionRangeStarts(envPtr, range); envPtr->currStackDepth++; SetLineInformation(parsePtr->numWords-1); CompileBody(envPtr, tokenPtr, interp); envPtr->currStackDepth = savedStackDepth; ExceptionRangeEnds(envPtr, range); /* * Now fold the results back into the dictionary in the OK case. */ TclEmitOpcode( INST_END_CATCH, envPtr); if (varNameTmp > -1) { Emit14Inst( INST_LOAD_SCALAR, varNameTmp, envPtr); } if (gotPath) { Emit14Inst( INST_LOAD_SCALAR, pathTmp, envPtr); } else { PushLiteral(envPtr, "", 0); } Emit14Inst( INST_LOAD_SCALAR, keysTmp, envPtr); if (dictVar == -1) { TclEmitOpcode( INST_DICT_RECOMBINE_STK, envPtr); } else { TclEmitInstInt4( INST_DICT_RECOMBINE_IMM, dictVar, envPtr); } TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpFixup); /* * Now fold the results back into the dictionary in the exception case. */ ExceptionRangeTarget(envPtr, range, catchOffset); TclEmitOpcode( INST_PUSH_RETURN_OPTIONS, envPtr); TclEmitOpcode( INST_PUSH_RESULT, envPtr); TclEmitOpcode( INST_END_CATCH, envPtr); if (varNameTmp > -1) { Emit14Inst( INST_LOAD_SCALAR, varNameTmp, envPtr); } if (parsePtr->numWords > 3) { Emit14Inst( INST_LOAD_SCALAR, pathTmp, envPtr); } else { PushLiteral(envPtr, "", 0); } Emit14Inst( INST_LOAD_SCALAR, keysTmp, envPtr); if (dictVar == -1) { TclEmitOpcode( INST_DICT_RECOMBINE_STK, envPtr); } else { TclEmitInstInt4( INST_DICT_RECOMBINE_IMM, dictVar, envPtr); } TclEmitOpcode( INST_RETURN_STK, envPtr); /* * Prepare for the start of the next command. */ envPtr->currStackDepth = savedStackDepth + 1; if (TclFixupForwardJumpToHere(envPtr, &jumpFixup, 127)) { Tcl_Panic("TclCompileDictCmd(update): bad jump distance %d", (int) (CurrentOffset(envPtr) - jumpFixup.codeOffset)); } return TCL_OK; } /* *---------------------------------------------------------------------- * * DupDictUpdateInfo, FreeDictUpdateInfo -- * * Functions to duplicate, release and print the aux data created for use * with the INST_DICT_UPDATE_START and INST_DICT_UPDATE_END instructions. * * Results: * DupDictUpdateInfo: a copy of the auxiliary data * FreeDictUpdateInfo: none * PrintDictUpdateInfo: none * * Side effects: * DupDictUpdateInfo: allocates memory * FreeDictUpdateInfo: releases memory * PrintDictUpdateInfo: none * *---------------------------------------------------------------------- */ static ClientData DupDictUpdateInfo( ClientData clientData) { DictUpdateInfo *dui1Ptr, *dui2Ptr; unsigned len; dui1Ptr = clientData; len = sizeof(DictUpdateInfo) + sizeof(int) * (dui1Ptr->length - 1); dui2Ptr = ckalloc(len); memcpy(dui2Ptr, dui1Ptr, len); return dui2Ptr; } static void FreeDictUpdateInfo( ClientData clientData) { ckfree(clientData); } static void PrintDictUpdateInfo( ClientData clientData, Tcl_Obj *appendObj, ByteCode *codePtr, unsigned int pcOffset) { DictUpdateInfo *duiPtr = clientData; int i; for (i=0 ; ilength ; i++) { if (i) { Tcl_AppendToObj(appendObj, ", ", -1); } Tcl_AppendPrintfToObj(appendObj, "%%v%u", duiPtr->varIndices[i]); } } /* *---------------------------------------------------------------------- * * TclCompileErrorCmd -- * * Procedure called to compile the "error" command. * * 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 "error" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileErrorCmd( Tcl_Interp *interp, /* Used for context. */ 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. */ { /* * General syntax: [error message ?errorInfo? ?errorCode?] * However, we only deal with the case where there is just a message. */ Tcl_Token *messageTokenPtr; int savedStackDepth = envPtr->currStackDepth; DefineLineInformation; /* TIP #280 */ if (parsePtr->numWords != 2) { return TCL_ERROR; } messageTokenPtr = TokenAfter(parsePtr->tokenPtr); PushLiteral(envPtr, "-code error -level 0", 20); CompileWord(envPtr, messageTokenPtr, interp, 1); TclEmitOpcode(INST_RETURN_STK, envPtr); envPtr->currStackDepth = savedStackDepth + 1; return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileExprCmd -- * * Procedure called to compile the "expr" command. * * 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 "expr" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileExprCmd( 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 *firstWordPtr; if (parsePtr->numWords == 1) { return TCL_ERROR; } /* * TIP #280: Use the per-word line information of the current command. */ envPtr->line = envPtr->extCmdMapPtr->loc[ envPtr->extCmdMapPtr->nuloc-1].line[1]; firstWordPtr = TokenAfter(parsePtr->tokenPtr); TclCompileExprWords(interp, firstWordPtr, parsePtr->numWords-1, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileForCmd -- * * Procedure called to compile the "for" command. * * 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 "for" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileForCmd( 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 *startTokenPtr, *testTokenPtr, *nextTokenPtr, *bodyTokenPtr; JumpFixup jumpEvalCondFixup; int testCodeOffset, bodyCodeOffset, nextCodeOffset, jumpDist; int bodyRange, nextRange; int savedStackDepth = envPtr->currStackDepth; DefineLineInformation; /* TIP #280 */ if (parsePtr->numWords != 5) { return TCL_ERROR; } /* * If the test expression requires substitutions, don't compile the for * command inline. E.g., the expression might cause the loop to never * execute or execute forever, as in "for {} "$x > 5" {incr x} {}". */ startTokenPtr = TokenAfter(parsePtr->tokenPtr); testTokenPtr = TokenAfter(startTokenPtr); if (testTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } /* * Bail out also if the body or the next expression require substitutions * in order to insure correct behaviour [Bug 219166] */ nextTokenPtr = TokenAfter(testTokenPtr); bodyTokenPtr = TokenAfter(nextTokenPtr); if ((nextTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) || (bodyTokenPtr->type != TCL_TOKEN_SIMPLE_WORD)) { return TCL_ERROR; } /* * Create ExceptionRange records for the body and the "next" command. The * "next" command's ExceptionRange supports break but not continue (and * has a -1 continueOffset). */ bodyRange = DeclareExceptionRange(envPtr, LOOP_EXCEPTION_RANGE); nextRange = TclCreateExceptRange(LOOP_EXCEPTION_RANGE, envPtr); /* * Inline compile the initial command. */ SetLineInformation(1); CompileBody(envPtr, startTokenPtr, interp); TclEmitOpcode(INST_POP, envPtr); /* * Jump to the evaluation of the condition. This code uses the "loop * rotation" optimisation (which eliminates one branch from the loop). * "for start cond next body" produces then: * start * goto A * B: body : bodyCodeOffset * next : nextCodeOffset, continueOffset * A: cond -> result : testCodeOffset * if (result) goto B */ TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpEvalCondFixup); /* * Compile the loop body. */ bodyCodeOffset = ExceptionRangeStarts(envPtr, bodyRange); SetLineInformation(4); CompileBody(envPtr, bodyTokenPtr, interp); ExceptionRangeEnds(envPtr, bodyRange); envPtr->currStackDepth = savedStackDepth + 1; TclEmitOpcode(INST_POP, envPtr); /* * Compile the "next" subcommand. */ envPtr->currStackDepth = savedStackDepth; nextCodeOffset = ExceptionRangeStarts(envPtr, nextRange); SetLineInformation(3); CompileBody(envPtr, nextTokenPtr, interp); ExceptionRangeEnds(envPtr, nextRange); envPtr->currStackDepth = savedStackDepth + 1; TclEmitOpcode(INST_POP, envPtr); envPtr->currStackDepth = savedStackDepth; /* * Compile the test expression then emit the conditional jump that * terminates the for. */ testCodeOffset = CurrentOffset(envPtr); jumpDist = testCodeOffset - jumpEvalCondFixup.codeOffset; if (TclFixupForwardJump(envPtr, &jumpEvalCondFixup, jumpDist, 127)) { bodyCodeOffset += 3; nextCodeOffset += 3; testCodeOffset += 3; } SetLineInformation(2); envPtr->currStackDepth = savedStackDepth; TclCompileExprWords(interp, testTokenPtr, 1, envPtr); envPtr->currStackDepth = savedStackDepth + 1; jumpDist = CurrentOffset(envPtr) - bodyCodeOffset; if (jumpDist > 127) { TclEmitInstInt4(INST_JUMP_TRUE4, -jumpDist, envPtr); } else { TclEmitInstInt1(INST_JUMP_TRUE1, -jumpDist, envPtr); } /* * Fix the starting points of the exception ranges (may have moved due to * jump type modification) and set where the exceptions target. */ envPtr->exceptArrayPtr[bodyRange].codeOffset = bodyCodeOffset; envPtr->exceptArrayPtr[bodyRange].continueOffset = nextCodeOffset; envPtr->exceptArrayPtr[nextRange].codeOffset = nextCodeOffset; ExceptionRangeTarget(envPtr, bodyRange, breakOffset); ExceptionRangeTarget(envPtr, nextRange, breakOffset); /* * The for command's result is an empty string. */ envPtr->currStackDepth = savedStackDepth; PushLiteral(envPtr, "", 0); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileForeachCmd -- * * Procedure called to compile the "foreach" command. * * 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 "foreach" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileForeachCmd( 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. */ { return CompileEachloopCmd(interp, parsePtr, cmdPtr, envPtr, TCL_EACH_KEEP_NONE); } /* *---------------------------------------------------------------------- * * CompileEachloopCmd -- * * Procedure called to compile the "foreach" and "lmap" commands. * * 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 "foreach" command at * runtime. * *---------------------------------------------------------------------- */ static int CompileEachloopCmd( 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. */ int collect) /* Select collecting or accumulating mode * (TCL_EACH_*) */ { Proc *procPtr = envPtr->procPtr; ForeachInfo *infoPtr; /* Points to the structure describing this * foreach command. Stored in a AuxData * record in the ByteCode. */ int firstValueTemp; /* Index of the first temp var in the frame * used to point to a value list. */ int loopCtTemp; /* Index of temp var holding the loop's * iteration count. */ int collectVar = -1; /* Index of temp var holding the result var * index. */ Tcl_Token *tokenPtr, *bodyTokenPtr; unsigned char *jumpPc; JumpFixup jumpFalseFixup; int jumpBackDist, jumpBackOffset, infoIndex, range, bodyIndex; int numWords, numLists, numVars, loopIndex, tempVar, i, j, code; int savedStackDepth = envPtr->currStackDepth; DefineLineInformation; /* TIP #280 */ /* * We parse the variable list argument words and create two arrays: * varcList[i] is number of variables in i-th var list. * varvList[i] points to array of var names in i-th var list. */ int *varcList; const char ***varvList; /* * If the foreach command isn't in a procedure, don't compile it inline: * the payoff is too small. */ if (procPtr == NULL) { return TCL_ERROR; } numWords = parsePtr->numWords; if ((numWords < 4) || (numWords%2 != 0)) { return TCL_ERROR; } /* * Bail out if the body requires substitutions in order to insure correct * behaviour. [Bug 219166] */ for (i = 0, tokenPtr = parsePtr->tokenPtr; i < numWords-1; i++) { tokenPtr = TokenAfter(tokenPtr); } bodyTokenPtr = tokenPtr; if (bodyTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } bodyIndex = i-1; /* * Allocate storage for the varcList and varvList arrays if necessary. */ numLists = (numWords - 2)/2; varcList = TclStackAlloc(interp, numLists * sizeof(int)); memset(varcList, 0, numLists * sizeof(int)); varvList = (const char ***) TclStackAlloc(interp, numLists * sizeof(const char **)); memset((char*) varvList, 0, numLists * sizeof(const char **)); /* * Break up each var list and set the varcList and varvList arrays. Don't * compile the foreach inline if any var name needs substitutions or isn't * a scalar, or if any var list needs substitutions. */ loopIndex = 0; for (i = 0, tokenPtr = parsePtr->tokenPtr; i < numWords-1; i++, tokenPtr = TokenAfter(tokenPtr)) { Tcl_DString varList; if (i%2 != 1) { continue; } if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { code = TCL_ERROR; goto done; } /* * Lots of copying going on here. Need a ListObj wizard to show a * better way. */ Tcl_DStringInit(&varList); TclDStringAppendToken(&varList, &tokenPtr[1]); code = Tcl_SplitList(interp, Tcl_DStringValue(&varList), &varcList[loopIndex], &varvList[loopIndex]); Tcl_DStringFree(&varList); if (code != TCL_OK) { code = TCL_ERROR; goto done; } numVars = varcList[loopIndex]; /* * If the variable list is empty, we can enter an infinite loop when * the interpreted version would not. Take care to ensure this does * not happen. [Bug 1671138] */ if (numVars == 0) { code = TCL_ERROR; goto done; } for (j = 0; j < numVars; j++) { const char *varName = varvList[loopIndex][j]; if (!TclIsLocalScalar(varName, (int) strlen(varName))) { code = TCL_ERROR; goto done; } } loopIndex++; } if (collect == TCL_EACH_COLLECT) { collectVar = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1, envPtr); if (collectVar < 0) { return TCL_ERROR; } } /* * We will compile the foreach command. Reserve (numLists + 1) temporary * variables: * - numLists temps to hold each value list * - 1 temp for the loop counter (index of next element in each list) * * At this time we don't try to reuse temporaries; if there are two * nonoverlapping foreach loops, they don't share any temps. */ code = TCL_OK; firstValueTemp = -1; for (loopIndex = 0; loopIndex < numLists; loopIndex++) { tempVar = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1, envPtr); if (loopIndex == 0) { firstValueTemp = tempVar; } } loopCtTemp = TclFindCompiledLocal(NULL, /*nameChars*/ 0, /*create*/ 1, envPtr); /* * Create and initialize the ForeachInfo and ForeachVarList data * structures describing this command. Then create a AuxData record * pointing to the ForeachInfo structure. */ infoPtr = ckalloc(sizeof(ForeachInfo) + numLists * sizeof(ForeachVarList *)); infoPtr->numLists = numLists; infoPtr->firstValueTemp = firstValueTemp; infoPtr->loopCtTemp = loopCtTemp; for (loopIndex = 0; loopIndex < numLists; loopIndex++) { ForeachVarList *varListPtr; numVars = varcList[loopIndex]; varListPtr = ckalloc(sizeof(ForeachVarList) + numVars * sizeof(int)); varListPtr->numVars = numVars; for (j = 0; j < numVars; j++) { const char *varName = varvList[loopIndex][j]; int nameChars = strlen(varName); varListPtr->varIndexes[j] = TclFindCompiledLocal(varName, nameChars, /*create*/ 1, envPtr); } infoPtr->varLists[loopIndex] = varListPtr; } infoIndex = TclCreateAuxData(infoPtr, &tclForeachInfoType, envPtr); /* * Create an exception record to handle [break] and [continue]. */ range = DeclareExceptionRange(envPtr, LOOP_EXCEPTION_RANGE); /* * Evaluate then store each value list in the associated temporary. */ loopIndex = 0; for (i = 0, tokenPtr = parsePtr->tokenPtr; i < numWords-1; i++, tokenPtr = TokenAfter(tokenPtr)) { if ((i%2 == 0) && (i > 0)) { SetLineInformation(i); CompileTokens(envPtr, tokenPtr, interp); tempVar = (firstValueTemp + loopIndex); Emit14Inst( INST_STORE_SCALAR, tempVar, envPtr); TclEmitOpcode( INST_POP, envPtr); loopIndex++; } } /* * Create temporary variable to capture return values from loop body. */ if (collect == TCL_EACH_COLLECT) { PushLiteral(envPtr, "", 0); Emit14Inst( INST_STORE_SCALAR, collectVar, envPtr); TclEmitOpcode( INST_POP, envPtr); } /* * Initialize the temporary var that holds the count of loop iterations. */ TclEmitInstInt4( INST_FOREACH_START4, infoIndex, envPtr); /* * Top of loop code: assign each loop variable and check whether * to terminate the loop. */ ExceptionRangeTarget(envPtr, range, continueOffset); TclEmitInstInt4( INST_FOREACH_STEP4, infoIndex, envPtr); TclEmitForwardJump(envPtr, TCL_FALSE_JUMP, &jumpFalseFixup); /* * Inline compile the loop body. */ SetLineInformation(bodyIndex); ExceptionRangeStarts(envPtr, range); CompileBody(envPtr, bodyTokenPtr, interp); ExceptionRangeEnds(envPtr, range); envPtr->currStackDepth = savedStackDepth + 1; if (collect == TCL_EACH_COLLECT) { Emit14Inst( INST_LAPPEND_SCALAR, collectVar,envPtr); } TclEmitOpcode( INST_POP, envPtr); /* * Jump back to the test at the top of the loop. Generate a 4 byte jump if * the distance to the test is > 120 bytes. This is conservative and * ensures that we won't have to replace this jump if we later need to * replace the ifFalse jump with a 4 byte jump. */ jumpBackOffset = CurrentOffset(envPtr); jumpBackDist = jumpBackOffset-envPtr->exceptArrayPtr[range].continueOffset; if (jumpBackDist > 120) { TclEmitInstInt4(INST_JUMP4, -jumpBackDist, envPtr); } else { TclEmitInstInt1(INST_JUMP1, -jumpBackDist, envPtr); } /* * Fix the target of the jump after the foreach_step test. */ if (TclFixupForwardJumpToHere(envPtr, &jumpFalseFixup, 127)) { /* * Update the loop body's starting PC offset since it moved down. */ envPtr->exceptArrayPtr[range].codeOffset += 3; /* * Update the jump back to the test at the top of the loop since it * also moved down 3 bytes. */ jumpBackOffset += 3; jumpPc = (envPtr->codeStart + jumpBackOffset); jumpBackDist += 3; if (jumpBackDist > 120) { TclUpdateInstInt4AtPc(INST_JUMP4, -jumpBackDist, jumpPc); } else { TclUpdateInstInt1AtPc(INST_JUMP1, -jumpBackDist, jumpPc); } } /* * Set the loop's break target. */ ExceptionRangeTarget(envPtr, range, breakOffset); /* * The command's result is an empty string if not collecting, or the * list of results from evaluating the loop body. */ envPtr->currStackDepth = savedStackDepth; if (collect == TCL_EACH_COLLECT) { Emit14Inst( INST_LOAD_SCALAR, collectVar, envPtr); TclEmitInstInt1(INST_UNSET_SCALAR, 0, envPtr); TclEmitInt4( collectVar, envPtr); } else { PushLiteral(envPtr, "", 0); } envPtr->currStackDepth = savedStackDepth + 1; done: for (loopIndex = 0; loopIndex < numLists; loopIndex++) { if (varvList[loopIndex] != NULL) { ckfree(varvList[loopIndex]); } } TclStackFree(interp, (void *)varvList); TclStackFree(interp, varcList); return code; } /* *---------------------------------------------------------------------- * * DupForeachInfo -- * * This procedure duplicates a ForeachInfo structure created as auxiliary * data during the compilation of a foreach command. * * Results: * A pointer to a newly allocated copy of the existing ForeachInfo * structure is returned. * * Side effects: * Storage for the copied ForeachInfo record is allocated. If the * original ForeachInfo structure pointed to any ForeachVarList records, * these structures are also copied and pointers to them are stored in * the new ForeachInfo record. * *---------------------------------------------------------------------- */ static ClientData DupForeachInfo( ClientData clientData) /* The foreach command's compilation auxiliary * data to duplicate. */ { register ForeachInfo *srcPtr = clientData; ForeachInfo *dupPtr; register ForeachVarList *srcListPtr, *dupListPtr; int numVars, i, j, numLists = srcPtr->numLists; dupPtr = ckalloc(sizeof(ForeachInfo) + numLists * sizeof(ForeachVarList *)); dupPtr->numLists = numLists; dupPtr->firstValueTemp = srcPtr->firstValueTemp; dupPtr->loopCtTemp = srcPtr->loopCtTemp; for (i = 0; i < numLists; i++) { srcListPtr = srcPtr->varLists[i]; numVars = srcListPtr->numVars; dupListPtr = ckalloc(sizeof(ForeachVarList) + numVars * sizeof(int)); dupListPtr->numVars = numVars; for (j = 0; j < numVars; j++) { dupListPtr->varIndexes[j] = srcListPtr->varIndexes[j]; } dupPtr->varLists[i] = dupListPtr; } return dupPtr; } /* *---------------------------------------------------------------------- * * FreeForeachInfo -- * * Procedure to free a ForeachInfo structure created as auxiliary data * during the compilation of a foreach command. * * Results: * None. * * Side effects: * Storage for the ForeachInfo structure pointed to by the ClientData * argument is freed as is any ForeachVarList record pointed to by the * ForeachInfo structure. * *---------------------------------------------------------------------- */ static void FreeForeachInfo( ClientData clientData) /* The foreach command's compilation auxiliary * data to free. */ { register ForeachInfo *infoPtr = clientData; register ForeachVarList *listPtr; int numLists = infoPtr->numLists; register int i; for (i = 0; i < numLists; i++) { listPtr = infoPtr->varLists[i]; ckfree(listPtr); } ckfree(infoPtr); } /* *---------------------------------------------------------------------- * * PrintForeachInfo -- * * Function to write a human-readable representation of a ForeachInfo * structure to stdout for debugging. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void PrintForeachInfo( ClientData clientData, Tcl_Obj *appendObj, ByteCode *codePtr, unsigned int pcOffset) { register ForeachInfo *infoPtr = clientData; register ForeachVarList *varsPtr; int i, j; Tcl_AppendToObj(appendObj, "data=[", -1); for (i=0 ; inumLists ; i++) { if (i) { Tcl_AppendToObj(appendObj, ", ", -1); } Tcl_AppendPrintfToObj(appendObj, "%%v%u", (unsigned) (infoPtr->firstValueTemp + i)); } Tcl_AppendPrintfToObj(appendObj, "], loop=%%v%u", (unsigned) infoPtr->loopCtTemp); for (i=0 ; inumLists ; i++) { if (i) { Tcl_AppendToObj(appendObj, ",", -1); } Tcl_AppendPrintfToObj(appendObj, "\n\t\t it%%v%u\t[", (unsigned) (infoPtr->firstValueTemp + i)); varsPtr = infoPtr->varLists[i]; for (j=0 ; jnumVars ; j++) { if (j) { Tcl_AppendToObj(appendObj, ", ", -1); } Tcl_AppendPrintfToObj(appendObj, "%%v%u", (unsigned) varsPtr->varIndexes[j]); } Tcl_AppendToObj(appendObj, "]", -1); } } /* *---------------------------------------------------------------------- * * TclCompileFormatCmd -- * * Procedure called to compile the "format" command. Handles cases that * can be done as constants or simple string concatenation only. * * 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 "format" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileFormatCmd( 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr = parsePtr->tokenPtr; Tcl_Obj **objv, *formatObj, *tmpObj; char *bytes, *start; int i, j, len; /* * Don't handle any guaranteed-error cases. */ if (parsePtr->numWords < 2) { return TCL_ERROR; } /* * Check if the argument words are all compile-time-known literals; that's * a case we can handle by compiling to a constant. */ formatObj = Tcl_NewObj(); Tcl_IncrRefCount(formatObj); tokenPtr = TokenAfter(tokenPtr); if (!TclWordKnownAtCompileTime(tokenPtr, formatObj)) { Tcl_DecrRefCount(formatObj); return TCL_ERROR; } objv = ckalloc((parsePtr->numWords-2) * sizeof(Tcl_Obj *)); for (i=0 ; i+2 < parsePtr->numWords ; i++) { tokenPtr = TokenAfter(tokenPtr); objv[i] = Tcl_NewObj(); Tcl_IncrRefCount(objv[i]); if (!TclWordKnownAtCompileTime(tokenPtr, objv[i])) { goto checkForStringConcatCase; } } /* * Everything is a literal, so the result is constant too (or an error if * the format is broken). Do the format now. */ tmpObj = Tcl_Format(interp, Tcl_GetString(formatObj), parsePtr->numWords-2, objv); for (; --i>=0 ;) { Tcl_DecrRefCount(objv[i]); } ckfree(objv); Tcl_DecrRefCount(formatObj); if (tmpObj == NULL) { return TCL_ERROR; } /* * Not an error, always a constant result, so just push the result as a * literal. Job done. */ bytes = Tcl_GetStringFromObj(tmpObj, &len); PushLiteral(envPtr, bytes, len); Tcl_DecrRefCount(tmpObj); return TCL_OK; checkForStringConcatCase: /* * See if we can generate a sequence of things to concatenate. This * requires that all the % sequences be %s or %%, as everything else is * sufficiently complex that we don't bother. * * First, get the state of the system relatively sensible (cleaning up * after our attempt to spot a literal). */ for (; --i>=0 ;) { Tcl_DecrRefCount(objv[i]); } ckfree(objv); tokenPtr = TokenAfter(parsePtr->tokenPtr); tokenPtr = TokenAfter(tokenPtr); i = 0; /* * Now scan through and check for non-%s and non-%% substitutions. */ for (bytes = Tcl_GetString(formatObj) ; *bytes ; bytes++) { if (*bytes == '%') { bytes++; if (*bytes == 's') { i++; continue; } else if (*bytes == '%') { continue; } Tcl_DecrRefCount(formatObj); return TCL_ERROR; } } /* * Check if the number of things to concatenate will fit in a byte. */ if (i+2 != parsePtr->numWords || i > 125) { Tcl_DecrRefCount(formatObj); return TCL_ERROR; } /* * Generate the pushes of the things to concatenate, a sequence of * literals and compiled tokens (of which at least one is non-literal or * we'd have the case in the first half of this function) which we will * concatenate. */ i = 0; /* The count of things to concat. */ j = 2; /* The index into the argument tokens, for * TIP#280 handling. */ start = Tcl_GetString(formatObj); /* The start of the currently-scanned literal * in the format string. */ tmpObj = Tcl_NewObj(); /* The buffer used to accumulate the literal * being built. */ for (bytes = start ; *bytes ; bytes++) { if (*bytes == '%') { Tcl_AppendToObj(tmpObj, start, bytes - start); if (*++bytes == '%') { Tcl_AppendToObj(tmpObj, "%", 1); } else { char *b = Tcl_GetStringFromObj(tmpObj, &len); /* * If there is a non-empty literal from the format string, * push it and reset. */ if (len > 0) { PushLiteral(envPtr, b, len); Tcl_DecrRefCount(tmpObj); tmpObj = Tcl_NewObj(); i++; } /* * Push the code to produce the string that would be * substituted with %s, except we'll be concatenating * directly. */ CompileWord(envPtr, tokenPtr, interp, j); tokenPtr = TokenAfter(tokenPtr); j++; i++; } start = bytes + 1; } } /* * Handle the case of a trailing literal. */ Tcl_AppendToObj(tmpObj, start, bytes - start); bytes = Tcl_GetStringFromObj(tmpObj, &len); if (len > 0) { PushLiteral(envPtr, bytes, len); i++; } Tcl_DecrRefCount(tmpObj); Tcl_DecrRefCount(formatObj); if (i > 1) { /* * Do the concatenation, which produces the result. */ TclEmitInstInt1(INST_CONCAT1, i, envPtr); } else { /* * EVIL HACK! Force there to be a string representation in the case * where there's just a "%s" in the format; case covered by the test * format-20.1 (and it is horrible...) */ TclEmitOpcode(INST_DUP, envPtr); PushLiteral(envPtr, "", 0); TclEmitOpcode(INST_STR_EQ, envPtr); TclEmitOpcode(INST_POP, envPtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileGlobalCmd -- * * Procedure called to compile the "global" command. * * 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 "global" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileGlobalCmd( 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 *varTokenPtr; int localIndex, numWords, i; DefineLineInformation; /* TIP #280 */ numWords = parsePtr->numWords; if (numWords < 2) { return TCL_ERROR; } /* * 'global' has no effect outside of proc bodies; handle that at runtime */ if (envPtr->procPtr == NULL) { return TCL_ERROR; } /* * Push the namespace */ PushLiteral(envPtr, "::", 2); /* * Loop over the variables. */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); for (i=2; i<=numWords; varTokenPtr = TokenAfter(varTokenPtr),i++) { localIndex = IndexTailVarIfKnown(interp, varTokenPtr, envPtr); if (localIndex < 0) { return TCL_ERROR; } CompileWord(envPtr, varTokenPtr, interp, 1); TclEmitInstInt4( INST_NSUPVAR, localIndex, envPtr); } /* * Pop the namespace, and set the result to empty */ TclEmitOpcode( INST_POP, envPtr); PushLiteral(envPtr, "", 0); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileIfCmd -- * * Procedure called to compile the "if" command. * * 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 "if" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileIfCmd( 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. */ { JumpFixupArray jumpFalseFixupArray; /* Used to fix the ifFalse jump after each * test when its target PC is determined. */ JumpFixupArray jumpEndFixupArray; /* Used to fix the jump after each "then" body * to the end of the "if" when that PC is * determined. */ Tcl_Token *tokenPtr, *testTokenPtr; int jumpIndex = 0; /* Avoid compiler warning. */ int jumpFalseDist, numWords, wordIdx, numBytes, j, code; const char *word; int savedStackDepth = envPtr->currStackDepth; /* Saved stack depth at the start of the first * test; the envPtr current depth is restored * to this value at the start of each test. */ int realCond = 1; /* Set to 0 for static conditions: * "if 0 {..}" */ int boolVal; /* Value of static condition. */ int compileScripts = 1; DefineLineInformation; /* TIP #280 */ /* * Only compile the "if" command if all arguments are simple words, in * order to insure correct substitution [Bug 219166] */ tokenPtr = parsePtr->tokenPtr; wordIdx = 0; numWords = parsePtr->numWords; for (wordIdx = 0; wordIdx < numWords; wordIdx++) { if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } tokenPtr = TokenAfter(tokenPtr); } TclInitJumpFixupArray(&jumpFalseFixupArray); TclInitJumpFixupArray(&jumpEndFixupArray); code = TCL_OK; /* * Each iteration of this loop compiles one "if expr ?then? body" or * "elseif expr ?then? body" clause. */ tokenPtr = parsePtr->tokenPtr; wordIdx = 0; while (wordIdx < numWords) { /* * Stop looping if the token isn't "if" or "elseif". */ word = tokenPtr[1].start; numBytes = tokenPtr[1].size; if ((tokenPtr == parsePtr->tokenPtr) || ((numBytes == 6) && (strncmp(word, "elseif", 6) == 0))) { tokenPtr = TokenAfter(tokenPtr); wordIdx++; } else { break; } if (wordIdx >= numWords) { code = TCL_ERROR; goto done; } /* * Compile the test expression then emit the conditional jump around * the "then" part. */ envPtr->currStackDepth = savedStackDepth; testTokenPtr = tokenPtr; if (realCond) { /* * Find out if the condition is a constant. */ Tcl_Obj *boolObj = Tcl_NewStringObj(testTokenPtr[1].start, testTokenPtr[1].size); Tcl_IncrRefCount(boolObj); code = Tcl_GetBooleanFromObj(NULL, boolObj, &boolVal); TclDecrRefCount(boolObj); if (code == TCL_OK) { /* * A static condition. */ realCond = 0; if (!boolVal) { compileScripts = 0; } } else { SetLineInformation(wordIdx); Tcl_ResetResult(interp); TclCompileExprWords(interp, testTokenPtr, 1, envPtr); if (jumpFalseFixupArray.next >= jumpFalseFixupArray.end) { TclExpandJumpFixupArray(&jumpFalseFixupArray); } jumpIndex = jumpFalseFixupArray.next; jumpFalseFixupArray.next++; TclEmitForwardJump(envPtr, TCL_FALSE_JUMP, jumpFalseFixupArray.fixup+jumpIndex); } code = TCL_OK; } /* * Skip over the optional "then" before the then clause. */ tokenPtr = TokenAfter(testTokenPtr); wordIdx++; if (wordIdx >= numWords) { code = TCL_ERROR; goto done; } if (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { word = tokenPtr[1].start; numBytes = tokenPtr[1].size; if ((numBytes == 4) && (strncmp(word, "then", 4) == 0)) { tokenPtr = TokenAfter(tokenPtr); wordIdx++; if (wordIdx >= numWords) { code = TCL_ERROR; goto done; } } } /* * Compile the "then" command body. */ if (compileScripts) { SetLineInformation(wordIdx); envPtr->currStackDepth = savedStackDepth; CompileBody(envPtr, tokenPtr, interp); } if (realCond) { /* * Jump to the end of the "if" command. Both jumpFalseFixupArray * and jumpEndFixupArray are indexed by "jumpIndex". */ if (jumpEndFixupArray.next >= jumpEndFixupArray.end) { TclExpandJumpFixupArray(&jumpEndFixupArray); } jumpEndFixupArray.next++; TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, jumpEndFixupArray.fixup+jumpIndex); /* * Fix the target of the jumpFalse after the test. Generate a 4 * byte jump if the distance is > 120 bytes. This is conservative, * and ensures that we won't have to replace this jump if we later * also need to replace the proceeding jump to the end of the "if" * with a 4 byte jump. */ if (TclFixupForwardJumpToHere(envPtr, jumpFalseFixupArray.fixup+jumpIndex, 120)) { /* * Adjust the code offset for the proceeding jump to the end * of the "if" command. */ jumpEndFixupArray.fixup[jumpIndex].codeOffset += 3; } } else if (boolVal) { /* * We were processing an "if 1 {...}"; stop compiling scripts. */ compileScripts = 0; } else { /* * We were processing an "if 0 {...}"; reset so that the rest * (elseif, else) is compiled correctly. */ realCond = 1; compileScripts = 1; } tokenPtr = TokenAfter(tokenPtr); wordIdx++; } /* * Restore the current stack depth in the environment; the "else" clause * (or its default) will add 1 to this. */ envPtr->currStackDepth = savedStackDepth; /* * Check for the optional else clause. Do not compile anything if this was * an "if 1 {...}" case. */ if ((wordIdx < numWords) && (tokenPtr->type == TCL_TOKEN_SIMPLE_WORD)) { /* * There is an else clause. Skip over the optional "else" word. */ word = tokenPtr[1].start; numBytes = tokenPtr[1].size; if ((numBytes == 4) && (strncmp(word, "else", 4) == 0)) { tokenPtr = TokenAfter(tokenPtr); wordIdx++; if (wordIdx >= numWords) { code = TCL_ERROR; goto done; } } if (compileScripts) { /* * Compile the else command body. */ SetLineInformation(wordIdx); CompileBody(envPtr, tokenPtr, interp); } /* * Make sure there are no words after the else clause. */ wordIdx++; if (wordIdx < numWords) { code = TCL_ERROR; goto done; } } else { /* * No else clause: the "if" command's result is an empty string. */ if (compileScripts) { PushLiteral(envPtr, "", 0); } } /* * Fix the unconditional jumps to the end of the "if" command. */ for (j = jumpEndFixupArray.next; j > 0; j--) { jumpIndex = (j - 1); /* i.e. process the closest jump first. */ if (TclFixupForwardJumpToHere(envPtr, jumpEndFixupArray.fixup+jumpIndex, 127)) { /* * Adjust the immediately preceeding "ifFalse" jump. We moved it's * target (just after this jump) down three bytes. */ unsigned char *ifFalsePc = envPtr->codeStart + jumpFalseFixupArray.fixup[jumpIndex].codeOffset; unsigned char opCode = *ifFalsePc; if (opCode == INST_JUMP_FALSE1) { jumpFalseDist = TclGetInt1AtPtr(ifFalsePc + 1); jumpFalseDist += 3; TclStoreInt1AtPtr(jumpFalseDist, (ifFalsePc + 1)); } else if (opCode == INST_JUMP_FALSE4) { jumpFalseDist = TclGetInt4AtPtr(ifFalsePc + 1); jumpFalseDist += 3; TclStoreInt4AtPtr(jumpFalseDist, (ifFalsePc + 1)); } else { Tcl_Panic("TclCompileIfCmd: unexpected opcode \"%d\" updating ifFalse jump", (int) opCode); } } } /* * Free the jumpFixupArray array if malloc'ed storage was used. */ done: envPtr->currStackDepth = savedStackDepth + 1; TclFreeJumpFixupArray(&jumpFalseFixupArray); TclFreeJumpFixupArray(&jumpEndFixupArray); return code; } /* *---------------------------------------------------------------------- * * TclCompileIncrCmd -- * * Procedure called to compile the "incr" command. * * 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 "incr" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileIncrCmd( 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 *varTokenPtr, *incrTokenPtr; int simpleVarName, isScalar, localIndex, haveImmValue, immValue; DefineLineInformation; /* TIP #280 */ if ((parsePtr->numWords != 2) && (parsePtr->numWords != 3)) { return TCL_ERROR; } varTokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, varTokenPtr, envPtr, TCL_NO_LARGE_INDEX, &localIndex, &simpleVarName, &isScalar, 1); /* * If an increment is given, push it, but see first if it's a small * integer. */ haveImmValue = 0; immValue = 1; if (parsePtr->numWords == 3) { incrTokenPtr = TokenAfter(varTokenPtr); if (incrTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { const char *word = incrTokenPtr[1].start; int numBytes = incrTokenPtr[1].size; int code; Tcl_Obj *intObj = Tcl_NewStringObj(word, numBytes); Tcl_IncrRefCount(intObj); code = TclGetIntFromObj(NULL, intObj, &immValue); TclDecrRefCount(intObj); if ((code == TCL_OK) && (-127 <= immValue) && (immValue <= 127)) { haveImmValue = 1; } if (!haveImmValue) { PushLiteral(envPtr, word, numBytes); } } else { SetLineInformation(2); CompileTokens(envPtr, incrTokenPtr, interp); } } else { /* No incr amount given so use 1. */ haveImmValue = 1; } /* * Emit the instruction to increment the variable. */ if (!simpleVarName) { if (haveImmValue) { TclEmitInstInt1( INST_INCR_STK_IMM, immValue, envPtr); } else { TclEmitOpcode( INST_INCR_STK, envPtr); } } else if (isScalar) { /* Simple scalar variable. */ if (localIndex >= 0) { if (haveImmValue) { TclEmitInstInt1(INST_INCR_SCALAR1_IMM, localIndex, envPtr); TclEmitInt1(immValue, envPtr); } else { TclEmitInstInt1(INST_INCR_SCALAR1, localIndex, envPtr); } } else { if (haveImmValue) { TclEmitInstInt1(INST_INCR_SCALAR_STK_IMM, immValue, envPtr); } else { TclEmitOpcode( INST_INCR_SCALAR_STK, envPtr); } } } else { /* Simple array variable. */ if (localIndex >= 0) { if (haveImmValue) { TclEmitInstInt1(INST_INCR_ARRAY1_IMM, localIndex, envPtr); TclEmitInt1(immValue, envPtr); } else { TclEmitInstInt1(INST_INCR_ARRAY1, localIndex, envPtr); } } else { if (haveImmValue) { TclEmitInstInt1(INST_INCR_ARRAY_STK_IMM, immValue, envPtr); } else { TclEmitOpcode( INST_INCR_ARRAY_STK, envPtr); } } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileInfo*Cmd -- * * Procedures called to compile "info" subcommands. * * 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 "info" subcommand at * runtime. * *---------------------------------------------------------------------- */ int TclCompileInfoCommandsCmd( 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) { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr; Tcl_Obj *objPtr; char *bytes; /* * We require one compile-time known argument for the case we can compile. */ if (parsePtr->numWords != 2) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); objPtr = Tcl_NewObj(); Tcl_IncrRefCount(objPtr); if (!TclWordKnownAtCompileTime(tokenPtr, objPtr)) { goto notCompilable; } bytes = Tcl_GetString(objPtr); /* * We require that the argument start with "::" and not have any of "*\[?" * in it. (Theoretically, we should look in only the final component, but * the difference is so slight given current naming practices.) */ if (bytes[0] != ':' || bytes[1] != ':' || !TclMatchIsTrivial(bytes)) { goto notCompilable; } Tcl_DecrRefCount(objPtr); /* * Confirmed as a literal that will not frighten the horses. Compile. Note * that the result needs to be list-ified. */ CompileWord(envPtr, tokenPtr, interp, 1); TclEmitOpcode( INST_RESOLVE_COMMAND, envPtr); TclEmitOpcode( INST_DUP, envPtr); TclEmitOpcode( INST_STR_LEN, envPtr); TclEmitInstInt1( INST_JUMP_FALSE1, 7, envPtr); TclEmitInstInt4( INST_LIST, 1, envPtr); return TCL_OK; notCompilable: Tcl_DecrRefCount(objPtr); return TCL_ERROR; } int TclCompileInfoCoroutineCmd( 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. */ { /* * Only compile [info coroutine] without arguments. */ if (parsePtr->numWords != 1) { return TCL_ERROR; } /* * Not much to do; we compile to a single instruction... */ TclEmitOpcode( INST_COROUTINE_NAME, envPtr); return TCL_OK; } int TclCompileInfoExistsCmd( 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; int isScalar, simpleVarName, localIndex; DefineLineInformation; /* TIP #280 */ if (parsePtr->numWords != 2) { return TCL_ERROR; } /* * Decide if we can use a frame slot for the var/array name or if we need * to emit code to compute and push the name at runtime. We use a frame * slot (entry in the array of local vars) if we are compiling a procedure * body and if the name is simple text that does not include namespace * qualifiers. */ tokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, tokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); /* * Emit instruction to check the variable for existence. */ if (!simpleVarName) { TclEmitOpcode( INST_EXIST_STK, envPtr); } else if (isScalar) { if (localIndex < 0) { TclEmitOpcode( INST_EXIST_STK, envPtr); } else { TclEmitInstInt4( INST_EXIST_SCALAR, localIndex, envPtr); } } else { if (localIndex < 0) { TclEmitOpcode( INST_EXIST_ARRAY_STK, envPtr); } else { TclEmitInstInt4( INST_EXIST_ARRAY, localIndex, envPtr); } } return TCL_OK; } int TclCompileInfoLevelCmd( 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. */ { /* * Only compile [info level] without arguments or with a single argument. */ if (parsePtr->numWords == 1) { /* * Not much to do; we compile to a single instruction... */ TclEmitOpcode( INST_INFO_LEVEL_NUM, envPtr); } else if (parsePtr->numWords != 2) { return TCL_ERROR; } else { DefineLineInformation; /* TIP #280 */ /* * Compile the argument, then add the instruction to convert it into a * list of arguments. */ SetLineInformation(1); CompileTokens(envPtr, TokenAfter(parsePtr->tokenPtr), interp); TclEmitOpcode( INST_INFO_LEVEL_ARGS, envPtr); } return TCL_OK; } int TclCompileInfoObjectClassCmd( 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) { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr); if (parsePtr->numWords != 2) { return TCL_ERROR; } CompileWord(envPtr, tokenPtr, interp, 1); TclEmitOpcode( INST_TCLOO_CLASS, envPtr); return TCL_OK; } int TclCompileInfoObjectIsACmd( 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) { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr); /* * We only handle [info object isa object ]. The first three * words are compressed to a single token by the ensemble compilation * engine. */ if (parsePtr->numWords != 3) { return TCL_ERROR; } if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD || tokenPtr[1].size < 1 || strncmp(tokenPtr[1].start, "object", tokenPtr[1].size)) { return TCL_ERROR; } tokenPtr = TokenAfter(tokenPtr); /* * Issue the code. */ CompileWord(envPtr, tokenPtr, interp, 2); TclEmitOpcode( INST_TCLOO_IS_OBJECT, envPtr); return TCL_OK; } int TclCompileInfoObjectNamespaceCmd( 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) { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr); if (parsePtr->numWords != 2) { return TCL_ERROR; } CompileWord(envPtr, tokenPtr, interp, 1); TclEmitOpcode( INST_TCLOO_NS, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLappendCmd -- * * Procedure called to compile the "lappend" command. * * 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 "lappend" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileLappendCmd( 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 *varTokenPtr; int simpleVarName, isScalar, localIndex, numWords; DefineLineInformation; /* TIP #280 */ /* * If we're not in a procedure, don't compile. */ if (envPtr->procPtr == NULL) { return TCL_ERROR; } numWords = parsePtr->numWords; if (numWords == 1) { return TCL_ERROR; } if (numWords != 3) { /* * LAPPEND instructions currently only handle one value appends. */ return TCL_ERROR; } /* * Decide if we can use a frame slot for the var/array name or if we * need to emit code to compute and push the name at runtime. We use a * frame slot (entry in the array of local vars) if we are compiling a * procedure body and if the name is simple text that does not include * namespace qualifiers. */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, varTokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); /* * If we are doing an assignment, push the new value. In the no values * case, create an empty object. */ if (numWords > 2) { Tcl_Token *valueTokenPtr = TokenAfter(varTokenPtr); CompileWord(envPtr, valueTokenPtr, interp, 2); } /* * Emit instructions to set/get the variable. */ /* * The *_STK opcodes should be refactored to make better use of existing * LOAD/STORE instructions. */ if (!simpleVarName) { TclEmitOpcode( INST_LAPPEND_STK, envPtr); } else if (isScalar) { if (localIndex < 0) { TclEmitOpcode( INST_LAPPEND_STK, envPtr); } else { Emit14Inst( INST_LAPPEND_SCALAR, localIndex, envPtr); } } else { if (localIndex < 0) { TclEmitOpcode( INST_LAPPEND_ARRAY_STK, envPtr); } else { Emit14Inst( INST_LAPPEND_ARRAY, localIndex, envPtr); } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLassignCmd -- * * Procedure called to compile the "lassign" command. * * 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 "lassign" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileLassignCmd( 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; int simpleVarName, isScalar, localIndex, numWords, idx; DefineLineInformation; /* TIP #280 */ numWords = parsePtr->numWords; /* * Check for command syntax error, but we'll punt that to runtime. */ if (numWords < 3) { return TCL_ERROR; } /* * Generate code to push list being taken apart by [lassign]. */ tokenPtr = TokenAfter(parsePtr->tokenPtr); CompileWord(envPtr, tokenPtr, interp, 1); /* * Generate code to assign values from the list to variables. */ for (idx=0 ; idx= 0) { TclEmitOpcode( INST_DUP, envPtr); TclEmitInstInt4(INST_LIST_INDEX_IMM, idx, envPtr); Emit14Inst( INST_STORE_SCALAR, localIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); } else { TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitInstInt4(INST_LIST_INDEX_IMM, idx, envPtr); TclEmitOpcode( INST_STORE_SCALAR_STK, envPtr); TclEmitOpcode( INST_POP, envPtr); } } else { if (localIndex >= 0) { TclEmitInstInt4(INST_OVER, 1, envPtr); TclEmitInstInt4(INST_LIST_INDEX_IMM, idx, envPtr); Emit14Inst( INST_STORE_ARRAY, localIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); } else { TclEmitInstInt4(INST_OVER, 2, envPtr); TclEmitInstInt4(INST_LIST_INDEX_IMM, idx, envPtr); TclEmitOpcode( INST_STORE_ARRAY_STK, envPtr); TclEmitOpcode( INST_POP, envPtr); } } } /* * Generate code to leave the rest of the list on the stack. */ TclEmitInstInt4( INST_LIST_RANGE_IMM, idx, envPtr); TclEmitInt4( -2 /* == "end" */, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLindexCmd -- * * Procedure called to compile the "lindex" command. * * 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 "lindex" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileLindexCmd( 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 *idxTokenPtr, *valTokenPtr; int i, numWords = parsePtr->numWords; DefineLineInformation; /* TIP #280 */ /* * Quit if too few args. */ if (numWords <= 1) { return TCL_ERROR; } valTokenPtr = TokenAfter(parsePtr->tokenPtr); if (numWords != 3) { goto emitComplexLindex; } idxTokenPtr = TokenAfter(valTokenPtr); if (idxTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { Tcl_Obj *tmpObj; int idx, result; tmpObj = Tcl_NewStringObj(idxTokenPtr[1].start, idxTokenPtr[1].size); result = TclGetIntFromObj(NULL, tmpObj, &idx); if (result == TCL_OK) { if (idx < 0) { result = TCL_ERROR; } } else { result = TclGetIntForIndexM(NULL, tmpObj, -2, &idx); if (result == TCL_OK && idx > -2) { result = TCL_ERROR; } } TclDecrRefCount(tmpObj); if (result == TCL_OK) { /* * All checks have been completed, and we have exactly one of * these constructs: * lindex * lindex end- * This is best compiled as a push of the arbitrary value followed * by an "immediate lindex" which is the most efficient variety. */ CompileWord(envPtr, valTokenPtr, interp, 1); TclEmitInstInt4( INST_LIST_INDEX_IMM, idx, envPtr); return TCL_OK; } /* * If the conversion failed or the value was negative, we just keep on * going with the more complex compilation. */ } /* * Push the operands onto the stack. */ emitComplexLindex: for (i=1 ; iprocPtr == NULL) { return TCL_ERROR; } if (parsePtr->numWords == 1) { /* * [list] without arguments just pushes an empty object. */ PushLiteral(envPtr, "", 0); } else { /* * Push the all values onto the stack. */ numWords = parsePtr->numWords; valueTokenPtr = TokenAfter(parsePtr->tokenPtr); for (i = 1; i < numWords; i++) { CompileWord(envPtr, valueTokenPtr, interp, i); valueTokenPtr = TokenAfter(valueTokenPtr); } TclEmitInstInt4( INST_LIST, numWords - 1, envPtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLlengthCmd -- * * Procedure called to compile the "llength" command. * * 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 "llength" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileLlengthCmd( 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 *varTokenPtr; DefineLineInformation; /* TIP #280 */ if (parsePtr->numWords != 2) { return TCL_ERROR; } varTokenPtr = TokenAfter(parsePtr->tokenPtr); CompileWord(envPtr, varTokenPtr, interp, 1); TclEmitOpcode( INST_LIST_LENGTH, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLrangeCmd -- * * How to compile the "lrange" command. We only bother because we needed * the opcode anyway for "lassign". * *---------------------------------------------------------------------- */ int TclCompileLrangeCmd( Tcl_Interp *interp, /* Tcl interpreter for context. */ Tcl_Parse *parsePtr, /* Points to a parse structure for the * command. */ Command *cmdPtr, /* Points to defintion of command being * compiled. */ CompileEnv *envPtr) /* Holds the resulting instructions. */ { Tcl_Token *tokenPtr, *listTokenPtr; DefineLineInformation; /* TIP #280 */ Tcl_Obj *tmpObj; int idx1, idx2, result; if (parsePtr->numWords != 4) { return TCL_ERROR; } listTokenPtr = TokenAfter(parsePtr->tokenPtr); /* * Parse the first index. Will only compile if it is constant and not an * _integer_ less than zero (since we reserve negative indices here for * end-relative indexing). */ tokenPtr = TokenAfter(listTokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } tmpObj = Tcl_NewStringObj(tokenPtr[1].start, tokenPtr[1].size); result = TclGetIntFromObj(NULL, tmpObj, &idx1); if (result == TCL_OK) { if (idx1 < 0) { result = TCL_ERROR; } } else { result = TclGetIntForIndexM(NULL, tmpObj, -2, &idx1); if (result == TCL_OK && idx1 > -2) { result = TCL_ERROR; } } TclDecrRefCount(tmpObj); if (result != TCL_OK) { return TCL_ERROR; } /* * Parse the second index. Will only compile if it is constant and not an * _integer_ less than zero (since we reserve negative indices here for * end-relative indexing). */ tokenPtr = TokenAfter(tokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } tmpObj = Tcl_NewStringObj(tokenPtr[1].start, tokenPtr[1].size); result = TclGetIntFromObj(NULL, tmpObj, &idx2); if (result == TCL_OK) { if (idx2 < 0) { result = TCL_ERROR; } } else { result = TclGetIntForIndexM(NULL, tmpObj, -2, &idx2); if (result == TCL_OK && idx2 > -2) { result = TCL_ERROR; } } TclDecrRefCount(tmpObj); if (result != TCL_OK) { return TCL_ERROR; } /* * Issue instructions. It's not safe to skip doing the LIST_RANGE, as * we've not proved that the 'list' argument is really a list. Not that it * is worth trying to do that given current knowledge. */ CompileWord(envPtr, listTokenPtr, interp, 1); TclEmitInstInt4( INST_LIST_RANGE_IMM, idx1, envPtr); TclEmitInt4( idx2, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLreplaceCmd -- * * How to compile the "lreplace" command. We only bother with the case * where there are no elements to insert and where both the 'first' and * 'last' arguments are constant and one can be deterined to be at the * end of the list. (This is the case that could also be written with * "lrange".) * *---------------------------------------------------------------------- */ int TclCompileLreplaceCmd( Tcl_Interp *interp, /* Tcl interpreter for context. */ Tcl_Parse *parsePtr, /* Points to a parse structure for the * command. */ Command *cmdPtr, /* Points to defintion of command being * compiled. */ CompileEnv *envPtr) /* Holds the resulting instructions. */ { Tcl_Token *tokenPtr, *listTokenPtr; DefineLineInformation; /* TIP #280 */ Tcl_Obj *tmpObj; int idx1, idx2, result, guaranteedDropAll = 0; if (parsePtr->numWords != 4) { return TCL_ERROR; } listTokenPtr = TokenAfter(parsePtr->tokenPtr); /* * Parse the first index. Will only compile if it is constant and not an * _integer_ less than zero (since we reserve negative indices here for * end-relative indexing). */ tokenPtr = TokenAfter(listTokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } tmpObj = Tcl_NewStringObj(tokenPtr[1].start, tokenPtr[1].size); result = TclGetIntFromObj(NULL, tmpObj, &idx1); if (result == TCL_OK) { if (idx1 < 0) { result = TCL_ERROR; } } else { result = TclGetIntForIndexM(NULL, tmpObj, -2, &idx1); if (result == TCL_OK && idx1 > -2) { result = TCL_ERROR; } } TclDecrRefCount(tmpObj); if (result != TCL_OK) { return TCL_ERROR; } /* * Parse the second index. Will only compile if it is constant and not an * _integer_ less than zero (since we reserve negative indices here for * end-relative indexing). */ tokenPtr = TokenAfter(tokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } tmpObj = Tcl_NewStringObj(tokenPtr[1].start, tokenPtr[1].size); result = TclGetIntFromObj(NULL, tmpObj, &idx2); if (result == TCL_OK) { if (idx2 < 0) { result = TCL_ERROR; } } else { result = TclGetIntForIndexM(NULL, tmpObj, -2, &idx2); if (result == TCL_OK && idx2 > -2) { result = TCL_ERROR; } } TclDecrRefCount(tmpObj); if (result != TCL_OK) { return TCL_ERROR; } /* * Sanity check: can only issue when we're removing a range at one or * other end of the list. If we're at one end or the other, convert the * indices into the equivalent for an [lrange]. */ if (idx1 == 0) { if (idx2 == -2) { guaranteedDropAll = 1; } idx1 = idx2 + 1; idx2 = -2; } else if (idx2 == -2) { idx2 = idx1 - 1; idx1 = 0; } else { return TCL_ERROR; } /* * Issue instructions. It's not safe to skip doing the LIST_RANGE, as * we've not proved that the 'list' argument is really a list. Not that it * is worth trying to do that given current knowledge. */ CompileWord(envPtr, listTokenPtr, interp, 1); if (guaranteedDropAll) { TclEmitOpcode( INST_LIST_LENGTH, envPtr); TclEmitOpcode( INST_POP, envPtr); PushLiteral(envPtr, "", 0); } else { TclEmitInstInt4( INST_LIST_RANGE_IMM, idx1, envPtr); TclEmitInt4( idx2, envPtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLsetCmd -- * * Procedure called to compile the "lset" command. * * 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 "lset" command at * runtime. * * The general template for execution of the "lset" command is: * (1) Instructions to push the variable name, unless the variable is * local to the stack frame. * (2) If the variable is an array element, instructions to push the * array element name. * (3) Instructions to push each of zero or more "index" arguments to the * stack, followed with the "newValue" element. * (4) Instructions to duplicate the variable name and/or array element * name onto the top of the stack, if either was pushed at steps (1) * and (2). * (5) The appropriate INST_LOAD_* instruction to place the original * value of the list variable at top of stack. * (6) At this point, the stack contains: * varName? arrayElementName? index1 index2 ... newValue oldList * The compiler emits one of INST_LSET_FLAT or INST_LSET_LIST * according as whether there is exactly one index element (LIST) or * either zero or else two or more (FLAT). This instruction removes * everything from the stack except for the two names and pushes the * new value of the variable. * (7) Finally, INST_STORE_* stores the new value in the variable and * cleans up the stack. * *---------------------------------------------------------------------- */ int TclCompileLsetCmd( Tcl_Interp *interp, /* Tcl interpreter for error reporting. */ Tcl_Parse *parsePtr, /* Points to a parse structure for the * command. */ Command *cmdPtr, /* Points to defintion of command being * compiled. */ CompileEnv *envPtr) /* Holds the resulting instructions. */ { int tempDepth; /* Depth used for emitting one part of the * code burst. */ Tcl_Token *varTokenPtr; /* Pointer to the Tcl_Token representing the * parse of the variable name. */ int localIndex; /* Index of var in local var table. */ int simpleVarName; /* Flag == 1 if var name is simple. */ int isScalar; /* Flag == 1 if scalar, 0 if array. */ int i; DefineLineInformation; /* TIP #280 */ /* * Check argument count. */ if (parsePtr->numWords < 3) { /* * Fail at run time, not in compilation. */ return TCL_ERROR; } /* * Decide if we can use a frame slot for the var/array name or if we need * to emit code to compute and push the name at runtime. We use a frame * slot (entry in the array of local vars) if we are compiling a procedure * body and if the name is simple text that does not include namespace * qualifiers. */ varTokenPtr = TokenAfter(parsePtr->tokenPtr); PushVarNameWord(interp, varTokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); /* * Push the "index" args and the new element value. */ for (i=2 ; inumWords ; ++i) { varTokenPtr = TokenAfter(varTokenPtr); CompileWord(envPtr, varTokenPtr, interp, i); } /* * Duplicate the variable name if it's been pushed. */ if (!simpleVarName || localIndex < 0) { if (!simpleVarName || isScalar) { tempDepth = parsePtr->numWords - 2; } else { tempDepth = parsePtr->numWords - 1; } TclEmitInstInt4( INST_OVER, tempDepth, envPtr); } /* * Duplicate an array index if one's been pushed. */ if (simpleVarName && !isScalar) { if (localIndex < 0) { tempDepth = parsePtr->numWords - 1; } else { tempDepth = parsePtr->numWords - 2; } TclEmitInstInt4( INST_OVER, tempDepth, envPtr); } /* * Emit code to load the variable's value. */ if (!simpleVarName) { TclEmitOpcode( INST_LOAD_STK, envPtr); } else if (isScalar) { if (localIndex < 0) { TclEmitOpcode( INST_LOAD_SCALAR_STK, envPtr); } else { Emit14Inst( INST_LOAD_SCALAR, localIndex, envPtr); } } else { if (localIndex < 0) { TclEmitOpcode( INST_LOAD_ARRAY_STK, envPtr); } else { Emit14Inst( INST_LOAD_ARRAY, localIndex, envPtr); } } /* * Emit the correct variety of 'lset' instruction. */ if (parsePtr->numWords == 4) { TclEmitOpcode( INST_LSET_LIST, envPtr); } else { TclEmitInstInt4( INST_LSET_FLAT, parsePtr->numWords-1, envPtr); } /* * Emit code to put the value back in the variable. */ if (!simpleVarName) { TclEmitOpcode( INST_STORE_STK, envPtr); } else if (isScalar) { if (localIndex < 0) { TclEmitOpcode( INST_STORE_SCALAR_STK, envPtr); } else { Emit14Inst( INST_STORE_SCALAR, localIndex, envPtr); } } else { if (localIndex < 0) { TclEmitOpcode( INST_STORE_ARRAY_STK, envPtr); } else { Emit14Inst( INST_STORE_ARRAY, localIndex, envPtr); } } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileLmapCmd -- * * Procedure called to compile the "lmap" command. * * 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 "lmap" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileLmapCmd( 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. */ { return CompileEachloopCmd(interp, parsePtr, cmdPtr, envPtr, TCL_EACH_COLLECT); } /* *---------------------------------------------------------------------- * * TclCompileNamespace*Cmd -- * * Procedures called to compile the "namespace" command; currently, only * the subcommands "namespace current" and "namespace upvar" are compiled * to bytecodes, and the latter only inside a procedure(-like) context. * * 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 "namespace upvar" * command at runtime. * *---------------------------------------------------------------------- */ int TclCompileNamespaceCurrentCmd( 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. */ { /* * Only compile [namespace current] without arguments. */ if (parsePtr->numWords != 1) { return TCL_ERROR; } /* * Not much to do; we compile to a single instruction... */ TclEmitOpcode( INST_NS_CURRENT, envPtr); return TCL_OK; } int TclCompileNamespaceCodeCmd( 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; DefineLineInformation; /* TIP #280 */ if (parsePtr->numWords != 2) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); /* * The specification of [namespace code] is rather shocking, in that it is * supposed to check if the argument is itself the result of [namespace * code] and not apply itself in that case. Which is excessively cautious, * but what the test suite checks for. */ if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD || (tokenPtr[1].size > 20 && strncmp(tokenPtr[1].start, "::namespace inscope ", 20) == 0)) { /* * Technically, we could just pass a literal '::namespace inscope ' * term through, but that's something which really shouldn't be * occurring as something that the user writes so we'll just punt it. */ return TCL_ERROR; } /* * Now we can compile using the same strategy as [namespace code]'s normal * implementation does internally. Note that we can't bind the namespace * name directly here, because TclOO plays complex games with namespaces; * the value needs to be determined at runtime for safety. */ PushLiteral(envPtr, "::namespace", 11); PushLiteral(envPtr, "inscope", 7); TclEmitOpcode( INST_NS_CURRENT, envPtr); CompileWord(envPtr, tokenPtr, interp, 1); TclEmitInstInt4( INST_LIST, 4, envPtr); return TCL_OK; } int TclCompileNamespaceQualifiersCmd( 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); DefineLineInformation; /* TIP #280 */ int off; if (parsePtr->numWords != 2) { return TCL_ERROR; } CompileWord(envPtr, tokenPtr, interp, 1); PushLiteral(envPtr, "0", 1); PushLiteral(envPtr, "::", 2); TclEmitInstInt4( INST_OVER, 2, envPtr); TclEmitOpcode( INST_STR_FIND_LAST, envPtr); off = CurrentOffset(envPtr); PushLiteral(envPtr, "1", 1); TclEmitOpcode( INST_SUB, envPtr); TclEmitInstInt4( INST_OVER, 2, envPtr); TclEmitInstInt4( INST_OVER, 1, envPtr); TclEmitOpcode( INST_STR_INDEX, envPtr); PushLiteral(envPtr, ":", 1); TclEmitOpcode( INST_STR_EQ, envPtr); off = off - CurrentOffset(envPtr); TclEmitInstInt1( INST_JUMP_TRUE1, off, envPtr); TclEmitOpcode( INST_STR_RANGE, envPtr); return TCL_OK; } int TclCompileNamespaceTailCmd( 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); DefineLineInformation; /* TIP #280 */ JumpFixup jumpFixup; if (parsePtr->numWords != 2) { return TCL_ERROR; } /* * Take care; only add 2 to found index if the string was actually found. */ CompileWord(envPtr, tokenPtr, interp, 1); PushLiteral(envPtr, "::", 2); TclEmitInstInt4( INST_OVER, 1, envPtr); TclEmitOpcode( INST_STR_FIND_LAST, envPtr); TclEmitOpcode( INST_DUP, envPtr); PushLiteral(envPtr, "0", 1); TclEmitOpcode( INST_GE, envPtr); TclEmitForwardJump(envPtr, TCL_FALSE_JUMP, &jumpFixup); PushLiteral(envPtr, "2", 1); TclEmitOpcode( INST_ADD, envPtr); TclFixupForwardJumpToHere(envPtr, &jumpFixup, 127); PushLiteral(envPtr, "end", 3); TclEmitOpcode( INST_STR_RANGE, envPtr); return TCL_OK; } int TclCompileNamespaceUpvarCmd( 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, *otherTokenPtr, *localTokenPtr; int simpleVarName, isScalar, localIndex, numWords, i; DefineLineInformation; /* TIP #280 */ if (envPtr->procPtr == NULL) { return TCL_ERROR; } /* * Only compile [namespace upvar ...]: needs an even number of args, >=4 */ numWords = parsePtr->numWords; if ((numWords % 2) || (numWords < 4)) { return TCL_ERROR; } /* * Push the namespace */ tokenPtr = TokenAfter(parsePtr->tokenPtr); CompileWord(envPtr, tokenPtr, interp, 1); /* * Loop over the (otherVar, thisVar) pairs. If any of the thisVar is not a * local variable, return an error so that the non-compiled command will * be called at runtime. */ localTokenPtr = tokenPtr; for (i=3; i<=numWords; i+=2) { otherTokenPtr = TokenAfter(localTokenPtr); localTokenPtr = TokenAfter(otherTokenPtr); CompileWord(envPtr, otherTokenPtr, interp, 1); PushVarNameWord(interp, localTokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); if ((localIndex < 0) || !isScalar) { return TCL_ERROR; } TclEmitInstInt4( INST_NSUPVAR, localIndex, envPtr); } /* * Pop the namespace, and set the result to empty */ TclEmitOpcode( INST_POP, envPtr); PushLiteral(envPtr, "", 0); return TCL_OK; } int TclCompileNamespaceWhichCmd( 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. */ { DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr, *opt; int idx; if (parsePtr->numWords < 2 || parsePtr->numWords > 3) { return TCL_ERROR; } tokenPtr = TokenAfter(parsePtr->tokenPtr); idx = 1; /* * If there's an option, check that it's "-command". We don't handle * "-variable" (currently) and anything else is an error. */ if (parsePtr->numWords == 3) { if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { return TCL_ERROR; } opt = tokenPtr + 1; if (opt->size < 2 || opt->size > 8 || strncmp(opt->start, "-command", opt->size) != 0) { return TCL_ERROR; } tokenPtr = TokenAfter(tokenPtr); idx++; } /* * Issue the bytecode. */ CompileWord(envPtr, tokenPtr, interp, idx); TclEmitOpcode( INST_RESOLVE_COMMAND, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileRegexpCmd -- * * Procedure called to compile the "regexp" command. * * 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 "regexp" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileRegexpCmd( Tcl_Interp *interp, /* Tcl interpreter for error reporting. */ Tcl_Parse *parsePtr, /* Points to a parse structure for the * command. */ Command *cmdPtr, /* Points to defintion of command being * compiled. */ CompileEnv *envPtr) /* Holds the resulting instructions. */ { Tcl_Token *varTokenPtr; /* Pointer to the Tcl_Token representing the * parse of the RE or string. */ int i, len, nocase, exact, sawLast, simple; const char *str; DefineLineInformation; /* TIP #280 */ /* * We are only interested in compiling simple regexp cases. Currently * supported compile cases are: * regexp ?-nocase? ?--? staticString $var * regexp ?-nocase? ?--? {^staticString$} $var */ if (parsePtr->numWords < 3) { return TCL_ERROR; } simple = 0; nocase = 0; sawLast = 0; varTokenPtr = parsePtr->tokenPtr; /* * We only look for -nocase and -- as options. Everything else gets pushed * to runtime execution. This is different than regexp's runtime option * handling, but satisfies our stricter needs. */ for (i = 1; i < parsePtr->numWords - 2; i++) { varTokenPtr = TokenAfter(varTokenPtr); if (varTokenPtr->type != TCL_TOKEN_SIMPLE_WORD) { /* * Not a simple string, so punt to runtime. */ return TCL_ERROR; } str = varTokenPtr[1].start; len = varTokenPtr[1].size; if ((len == 2) && (str[0] == '-') && (str[1] == '-')) { sawLast++; i++; break; } else if ((len > 1) && (strncmp(str,"-nocase",(unsigned)len) == 0)) { nocase = 1; } else { /* * Not an option we recognize. */ return TCL_ERROR; } } if ((parsePtr->numWords - i) != 2) { /* * We don't support capturing to variables. */ return TCL_ERROR; } /* * Get the regexp string. If it is not a simple string or can't be * converted to a glob pattern, push the word for the INST_REGEXP. * Keep changes here in sync with TclCompileSwitchCmd Switch_Regexp. */ varTokenPtr = TokenAfter(varTokenPtr); if (varTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) { Tcl_DString ds; str = varTokenPtr[1].start; len = varTokenPtr[1].size; /* * If it has a '-', it could be an incorrectly formed regexp command. */ if ((*str == '-') && !sawLast) { return TCL_ERROR; } if (len == 0) { /* * The semantics of regexp are always match on re == "". */ PushLiteral(envPtr, "1", 1); return TCL_OK; } /* * Attempt to convert pattern to glob. If successful, push the * converted pattern as a literal. */ if (TclReToGlob(NULL, varTokenPtr[1].start, len, &ds, &exact) == TCL_OK) { simple = 1; PushLiteral(envPtr, Tcl_DStringValue(&ds),Tcl_DStringLength(&ds)); Tcl_DStringFree(&ds); } } if (!simple) { CompileWord(envPtr, varTokenPtr, interp, parsePtr->numWords-2); } /* * Push the string arg. */ varTokenPtr = TokenAfter(varTokenPtr); CompileWord(envPtr, varTokenPtr, interp, parsePtr->numWords-1); if (simple) { if (exact && !nocase) { TclEmitOpcode( INST_STR_EQ, envPtr); } else { TclEmitInstInt1( INST_STR_MATCH, nocase, envPtr); } } else { /* * Pass correct RE compile flags. We use only Int1 (8-bit), but * that handles all the flags we want to pass. * Don't use TCL_REG_NOSUB as we may have backrefs. */ int cflags = TCL_REG_ADVANCED | (nocase ? TCL_REG_NOCASE : 0); TclEmitInstInt1( INST_REGEXP, cflags, envPtr); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileRegsubCmd -- * * Procedure called to compile the "regsub" command. * * 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 "regsub" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileRegsubCmd( Tcl_Interp *interp, /* Tcl interpreter for error reporting. */ Tcl_Parse *parsePtr, /* Points to a parse structure for the * command. */ Command *cmdPtr, /* Points to defintion of command being * compiled. */ CompileEnv *envPtr) /* Holds the resulting instructions. */ { /* * We only compile the case with [regsub -all] where the pattern is both * known at compile time and simple (i.e., no RE metacharacters). That is, * the pattern must be translatable into a glob like "*foo*" with no other * glob metacharacters inside it; there must be some "foo" in there too. * The substitution string must also be known at compile time and free of * metacharacters ("\digit" and "&"). Finally, there must not be a * variable mentioned in the [regsub] to write the result back to (because * we can't get the count of substitutions that would be the result in * that case). The key is that these are the conditions under which a * [string map] could be used instead, in particular a [string map] of the * form we can compile to bytecode. * * In short, we look for: * * regsub -all [--] simpleRE string simpleReplacement * * The only optional part is the "--", and no other options are handled. */ DefineLineInformation; /* TIP #280 */ Tcl_Token *tokenPtr, *stringTokenPtr; Tcl_Obj *patternObj = NULL, *replacementObj = NULL; Tcl_DString pattern; const char *bytes; int len, exact, result = TCL_ERROR; if (parsePtr->numWords < 5 || parsePtr->numWords > 6) { return TCL_ERROR; } /* * Parse the "-all", which must be the first argument (other options not * supported, non-"-all" substitution we can't compile). */ tokenPtr = TokenAfter(parsePtr->tokenPtr); if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD || tokenPtr[1].size != 4 || strncmp(tokenPtr[1].start, "-all", 4)) { return TCL_ERROR; } /* * Get the pattern into patternObj, checking for "--" in the process. */ Tcl_DStringInit(&pattern); tokenPtr = TokenAfter(tokenPtr); patternObj = Tcl_NewObj(); if (!TclWordKnownAtCompileTime(tokenPtr, patternObj)) { goto done; } if (Tcl_GetString(patternObj)[0] == '-') { if (strcmp(Tcl_GetString(patternObj), "--") != 0 || parsePtr->numWords == 5) { goto done; } tokenPtr = TokenAfter(tokenPtr); Tcl_DecrRefCount(patternObj); patternObj = Tcl_NewObj(); if (!TclWordKnownAtCompileTime(tokenPtr, patternObj)) { goto done; } } else if (parsePtr->numWords == 6) { goto done; } /* * Identify the code which produces the string to apply the substitution * to (stringTokenPtr), and the replacement string (into replacementObj). */ stringTokenPtr = TokenAfter(tokenPtr); tokenPtr = TokenAfter(stringTokenPtr); replacementObj = Tcl_NewObj(); if (!TclWordKnownAtCompileTime(tokenPtr, replacementObj)) { goto done; } /* * Next, higher-level checks. Is the RE a very simple glob? Is the * replacement "simple"? */ bytes = Tcl_GetStringFromObj(patternObj, &len); if (TclReToGlob(NULL, bytes, len, &pattern, &exact) != TCL_OK || exact) { goto done; } bytes = Tcl_DStringValue(&pattern); if (*bytes++ != '*') { goto done; } while (1) { switch (*bytes) { case '*': if (bytes[1] == '\0') { /* * OK, we've proved there are no metacharacters except for the * '*' at each end. */ len = Tcl_DStringLength(&pattern) - 2; if (len > 0) { goto isSimpleGlob; } /* * The pattern is "**"! I believe that should be impossible, * but we definitely can't handle that at all. */ } case '\0': case '?': case '[': case '\\': goto done; } bytes++; } isSimpleGlob: for (bytes = Tcl_GetString(replacementObj); *bytes; bytes++) { switch (*bytes) { case '\\': case '&': goto done; } } /* * Proved the simplicity constraints! Time to issue the code. */ result = TCL_OK; bytes = Tcl_DStringValue(&pattern) + 1; PushLiteral(envPtr, bytes, len); bytes = Tcl_GetStringFromObj(replacementObj, &len); PushLiteral(envPtr, bytes, len); CompileWord(envPtr, stringTokenPtr, interp, parsePtr->numWords-2); TclEmitOpcode( INST_STR_MAP, envPtr); done: Tcl_DStringFree(&pattern); if (patternObj) { Tcl_DecrRefCount(patternObj); } if (replacementObj) { Tcl_DecrRefCount(replacementObj); } return result; } /* *---------------------------------------------------------------------- * * TclCompileReturnCmd -- * * Procedure called to compile the "return" command. * * 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 "return" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileReturnCmd( 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. */ { /* * General syntax: [return ?-option value ...? ?result?] * An even number of words means an explicit result argument is present. */ int level, code, objc, size, status = TCL_OK; int numWords = parsePtr->numWords; int explicitResult = (0 == (numWords % 2)); int numOptionWords = numWords - 1 - explicitResult; int savedStackDepth = envPtr->currStackDepth; Tcl_Obj *returnOpts, **objv; Tcl_Token *wordTokenPtr = TokenAfter(parsePtr->tokenPtr); DefineLineInformation; /* TIP #280 */ /* * Check for special case which can always be compiled: * return -options * Unlike the normal [return] compilation, this version does everything at * runtime so it can handle arbitrary words and not just literals. Note * that if INST_RETURN_STK wasn't already needed for something else * ('finally' clause processing) this piece of code would not be present. */ if ((numWords == 4) && (wordTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) && (wordTokenPtr[1].size == 8) && (strncmp(wordTokenPtr[1].start, "-options", 8) == 0)) { Tcl_Token *optsTokenPtr = TokenAfter(wordTokenPtr); Tcl_Token *msgTokenPtr = TokenAfter(optsTokenPtr); CompileWord(envPtr, optsTokenPtr, interp, 2); CompileWord(envPtr, msgTokenPtr, interp, 3); TclEmitOpcode(INST_RETURN_STK, envPtr); envPtr->currStackDepth = savedStackDepth + 1; return TCL_OK; } /* * Allocate some working space. */ objv = TclStackAlloc(interp, numOptionWords * sizeof(Tcl_Obj *)); /* * Scan through the return options. If any are unknown at compile time, * there is no value in bytecompiling. Save the option values known in an * objv array for merging into a return options dictionary. */ for (objc = 0; objc < numOptionWords; objc++) { objv[objc] = Tcl_NewObj(); Tcl_IncrRefCount(objv[objc]); if (!TclWordKnownAtCompileTime(wordTokenPtr, objv[objc])) { objc++; status = TCL_ERROR; goto cleanup; } wordTokenPtr = TokenAfter(wordTokenPtr); } status = TclMergeReturnOptions(interp, objc, objv, &returnOpts, &code, &level); cleanup: while (--objc >= 0) { TclDecrRefCount(objv[objc]); } TclStackFree(interp, objv); if (TCL_ERROR == status) { /* * Something was bogus in the return options. Clear the error message, * and report back to the compiler that this must be interpreted at * runtime. */ Tcl_ResetResult(interp); return TCL_ERROR; } /* * All options are known at compile time, so we're going to bytecompile. * Emit instructions to push the result on the stack. */ if (explicitResult) { CompileWord(envPtr, wordTokenPtr, interp, numWords-1); } else { /* * No explict result argument, so default result is empty string. */ PushLiteral(envPtr, "", 0); } /* * Check for optimization: When [return] is in a proc, and there's no * enclosing [catch], and there are no return options, then the INST_DONE * instruction is equivalent, and may be more efficient. */ if (numOptionWords == 0 && envPtr->procPtr != NULL) { /* * We have default return options and we're in a proc ... */ int index = envPtr->exceptArrayNext - 1; int enclosingCatch = 0; while (index >= 0) { ExceptionRange range = envPtr->exceptArrayPtr[index]; if ((range.type == CATCH_EXCEPTION_RANGE) && (range.catchOffset == -1)) { enclosingCatch = 1; break; } index--; } if (!enclosingCatch) { /* * ... and there is no enclosing catch. Issue the maximally * efficient exit instruction. */ Tcl_DecrRefCount(returnOpts); TclEmitOpcode(INST_DONE, envPtr); return TCL_OK; } } /* Optimize [return -level 0 $x]. */ Tcl_DictObjSize(NULL, returnOpts, &size); if (size == 0 && level == 0 && code == TCL_OK) { Tcl_DecrRefCount(returnOpts); return TCL_OK; } /* * Could not use the optimization, so we push the return options dict, and * emit the INST_RETURN_IMM instruction with code and level as operands. */ CompileReturnInternal(envPtr, INST_RETURN_IMM, code, level, returnOpts); return TCL_OK; } static void CompileReturnInternal( CompileEnv *envPtr, unsigned char op, int code, int level, Tcl_Obj *returnOpts) { TclEmitPush(TclAddLiteralObj(envPtr, returnOpts, NULL), envPtr); TclEmitInstInt4(op, code, envPtr); TclEmitInt4(level, envPtr); } void TclCompileSyntaxError( Tcl_Interp *interp, CompileEnv *envPtr) { Tcl_Obj *msg = Tcl_GetObjResult(interp); int numBytes; const char *bytes = TclGetStringFromObj(msg, &numBytes); TclErrorStackResetIf(interp, bytes, numBytes); TclEmitPush(TclRegisterNewLiteral(envPtr, bytes, numBytes), envPtr); CompileReturnInternal(envPtr, INST_SYNTAX, TCL_ERROR, 0, TclNoErrorStack(interp, Tcl_GetReturnOptions(interp, TCL_ERROR))); } /* *---------------------------------------------------------------------- * * TclCompileUpvarCmd -- * * Procedure called to compile the "upvar" command. * * 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 "upvar" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileUpvarCmd( 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, *otherTokenPtr, *localTokenPtr; int simpleVarName, isScalar, localIndex, numWords, i; DefineLineInformation; /* TIP #280 */ Tcl_Obj *objPtr = Tcl_NewObj(); if (envPtr->procPtr == NULL) { Tcl_DecrRefCount(objPtr); return TCL_ERROR; } numWords = parsePtr->numWords; if (numWords < 3) { Tcl_DecrRefCount(objPtr); return TCL_ERROR; } /* * Push the frame index if it is known at compile time */ tokenPtr = TokenAfter(parsePtr->tokenPtr); if (TclWordKnownAtCompileTime(tokenPtr, objPtr)) { CallFrame *framePtr; const Tcl_ObjType *newTypePtr, *typePtr = objPtr->typePtr; /* * Attempt to convert to a level reference. Note that TclObjGetFrame * only changes the obj type when a conversion was successful. */ TclObjGetFrame(interp, objPtr, &framePtr); newTypePtr = objPtr->typePtr; Tcl_DecrRefCount(objPtr); if (newTypePtr != typePtr) { if (numWords%2) { return TCL_ERROR; } CompileWord(envPtr, tokenPtr, interp, 1); otherTokenPtr = TokenAfter(tokenPtr); i = 4; } else { if (!(numWords%2)) { return TCL_ERROR; } PushLiteral(envPtr, "1", 1); otherTokenPtr = tokenPtr; i = 3; } } else { Tcl_DecrRefCount(objPtr); return TCL_ERROR; } /* * Loop over the (otherVar, thisVar) pairs. If any of the thisVar is not a * local variable, return an error so that the non-compiled command will * be called at runtime. */ for (; i<=numWords; i+=2, otherTokenPtr = TokenAfter(localTokenPtr)) { localTokenPtr = TokenAfter(otherTokenPtr); CompileWord(envPtr, otherTokenPtr, interp, 1); PushVarNameWord(interp, localTokenPtr, envPtr, 0, &localIndex, &simpleVarName, &isScalar, 1); if ((localIndex < 0) || !isScalar) { return TCL_ERROR; } TclEmitInstInt4( INST_UPVAR, localIndex, envPtr); } /* * Pop the frame index, and set the result to empty */ TclEmitOpcode( INST_POP, envPtr); PushLiteral(envPtr, "", 0); return TCL_OK; } /* *---------------------------------------------------------------------- * * TclCompileVariableCmd -- * * Procedure called to compile the "variable" command. * * 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 "variable" command at * runtime. * *---------------------------------------------------------------------- */ int TclCompileVariableCmd( 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 *varTokenPtr, *valueTokenPtr; int localIndex, numWords, i; DefineLineInformation; /* TIP #280 */ numWords = parsePtr->numWords; if (numWords < 2) { return TCL_ERROR; } /* * Bail out if not compiling a proc body */ if (envPtr->procPtr == NULL) { return TCL_ERROR; } /* * Loop over the (var, value) pairs. */ valueTokenPtr = parsePtr->tokenPtr; for (i=2; i<=numWords; i+=2) { varTokenPtr = TokenAfter(valueTokenPtr); valueTokenPtr = TokenAfter(varTokenPtr); localIndex = IndexTailVarIfKnown(interp, varTokenPtr, envPtr); if (localIndex < 0) { return TCL_ERROR; } CompileWord(envPtr, varTokenPtr, interp, 1); TclEmitInstInt4( INST_VARIABLE, localIndex, envPtr); if (i != numWords) { /* * A value has been given: set the variable, pop the value */ CompileWord(envPtr, valueTokenPtr, interp, 1); Emit14Inst( INST_STORE_SCALAR, localIndex, envPtr); TclEmitOpcode( INST_POP, envPtr); } } /* * Set the result to empty */ PushLiteral(envPtr, "", 0); return TCL_OK; } /* *---------------------------------------------------------------------- * * IndexTailVarIfKnown -- * * Procedure used in compiling [global] and [variable] commands. It * inspects the variable name described by varTokenPtr and, if the tail * is known at compile time, defines a corresponding local variable. * * Results: * Returns the variable's index in the table of compiled locals if the * tail is known at compile time, or -1 otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int IndexTailVarIfKnown( Tcl_Interp *interp, Tcl_Token *varTokenPtr, /* Token representing the variable name */ CompileEnv *envPtr) /* Holds resulting instructions. */ { Tcl_Obj *tailPtr; const char *tailName, *p; int len, n = varTokenPtr->numComponents; Tcl_Token *lastTokenPtr; int full, localIndex; /* * Determine if the tail is (a) known at compile time, and (b) not an * array element. Should any of these fail, return an error so that the * non-compiled command will be called at runtime. * * In order for the tail to be known at compile time, the last token in * the word has to be constant and contain "::" if it is not the only one. */ if (!EnvHasLVT(envPtr)) { return -1; } TclNewObj(tailPtr); if (TclWordKnownAtCompileTime(varTokenPtr, tailPtr)) { full = 1; lastTokenPtr = varTokenPtr; } else { full = 0; lastTokenPtr = varTokenPtr + n; if (!TclWordKnownAtCompileTime(lastTokenPtr, tailPtr)) { Tcl_DecrRefCount(tailPtr); return -1; } } tailName = TclGetStringFromObj(tailPtr, &len); if (len) { if (*(tailName+len-1) == ')') { /* * Possible array: bail out */ Tcl_DecrRefCount(tailPtr); return -1; } /* * Get the tail: immediately after the last '::' */ for (p = tailName + len -1; p > tailName; p--) { if ((*p == ':') && (*(p-1) == ':')) { p++; break; } } if (!full && (p == tailName)) { /* * No :: in the last component. */ Tcl_DecrRefCount(tailPtr); return -1; } len -= p - tailName; tailName = p; } localIndex = TclFindCompiledLocal(tailName, len, 1, envPtr); Tcl_DecrRefCount(tailPtr); return localIndex; } int TclCompileObjectSelfCmd( 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. */ { /* * We only handle [self] and [self object] (which is the same operation). * These are the only very common operations on [self] for which * bytecoding is at all reasonable. */ if (parsePtr->numWords == 1) { goto compileSelfObject; } else if (parsePtr->numWords == 2) { Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr), *subcmd; if (tokenPtr->type != TCL_TOKEN_SIMPLE_WORD || tokenPtr[1].size==0) { return TCL_ERROR; } subcmd = tokenPtr + 1; if (strncmp(subcmd->start, "object", subcmd->size) == 0) { goto compileSelfObject; } else if (strncmp(subcmd->start, "namespace", subcmd->size) == 0) { goto compileSelfNamespace; } } /* * Can't compile; handle with runtime call. */ return TCL_ERROR; compileSelfObject: /* * This delegates the entire problem to a single opcode. */ TclEmitOpcode( INST_TCLOO_SELF, envPtr); return TCL_OK; compileSelfNamespace: /* * This is formally only correct with TclOO methods as they are currently * implemented; it assumes that the current namespace is invariably when a * TclOO context is present is the object's namespace, and that's * technically only something that's a matter of current policy. But it * avoids creating another opcode, so that's all good! */ TclEmitOpcode( INST_TCLOO_SELF, envPtr); TclEmitOpcode( INST_POP, envPtr); TclEmitOpcode( INST_NS_CURRENT, envPtr); return TCL_OK; } /* *---------------------------------------------------------------------- * * PushVarName -- * * Procedure used in the compiling where pushing a variable name is * necessary (append, lappend, set). * * 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 "set" command at * runtime. * *---------------------------------------------------------------------- */ static int PushVarName( Tcl_Interp *interp, /* Used for error reporting. */ Tcl_Token *varTokenPtr, /* Points to a variable token. */ CompileEnv *envPtr, /* Holds resulting instructions. */ int flags, /* TCL_NO_LARGE_INDEX. */ int *localIndexPtr, /* Must not be NULL. */ int *simpleVarNamePtr, /* Must not be NULL. */ int *isScalarPtr, /* Must not be NULL. */ int line, /* Line the token starts on. */ int *clNext) /* Reference to offset of next hidden cont. * line. */ { register const char *p; const char *name, *elName; register int i, n; Tcl_Token *elemTokenPtr = NULL; int nameChars, elNameChars, simpleVarName, localIndex; int elemTokenCount = 0, allocedTokens = 0, removedParen = 0; /* * Decide if we can use a frame slot for the var/array name or if we need * to emit code to compute and push the name at runtime. We use a frame * slot (entry in the array of local vars) if we are compiling a procedure * body and if the name is simple text that does not include namespace * qualifiers. */ simpleVarName = 0; name = elName = NULL; nameChars = elNameChars = 0; localIndex = -1; /* * Check not only that the type is TCL_TOKEN_SIMPLE_WORD, but whether * curly braces surround the variable name. This really matters for array * elements to handle things like * set {x($foo)} 5 * which raises an undefined var error if we are not careful here. */ if ((varTokenPtr->type == TCL_TOKEN_SIMPLE_WORD) && (varTokenPtr->start[0] != '{')) { /* * A simple variable name. Divide it up into "name" and "elName" * strings. If it is not a local variable, look it up at runtime. */ simpleVarName = 1; name = varTokenPtr[1].start; nameChars = varTokenPtr[1].size; if (name[nameChars-1] == ')') { /* * last char is ')' => potential array reference. */ for (i=0,p=name ; itype = TCL_TOKEN_TEXT; elemTokenPtr->start = elName; elemTokenPtr->size = elNameChars; elemTokenPtr->numComponents = 0; elemTokenCount = 1; } } } else if (((n = varTokenPtr->numComponents) > 1) && (varTokenPtr[1].type == TCL_TOKEN_TEXT) && (varTokenPtr[n].type == TCL_TOKEN_TEXT) && (varTokenPtr[n].start[varTokenPtr[n].size - 1] == ')')) { /* * Check for parentheses inside first token. */ simpleVarName = 0; for (i = 0, p = varTokenPtr[1].start; i < varTokenPtr[1].size; i++, p++) { if (*p == '(') { simpleVarName = 1; break; } } if (simpleVarName) { int remainingChars; /* * Check the last token: if it is just ')', do not count it. * Otherwise, remove the ')' and flag so that it is restored at * the end. */ if (varTokenPtr[n].size == 1) { n--; } else { varTokenPtr[n].size--; removedParen = n; } name = varTokenPtr[1].start; nameChars = p - varTokenPtr[1].start; elName = p + 1; remainingChars = (varTokenPtr[2].start - p) - 1; elNameChars = (varTokenPtr[n].start-p) + varTokenPtr[n].size - 2; if (remainingChars) { /* * Make a first token with the extra characters in the first * token. */ elemTokenPtr = TclStackAlloc(interp, n * sizeof(Tcl_Token)); allocedTokens = 1; elemTokenPtr->type = TCL_TOKEN_TEXT; elemTokenPtr->start = elName; elemTokenPtr->size = remainingChars; elemTokenPtr->numComponents = 0; elemTokenCount = n; /* * Copy the remaining tokens. */ memcpy(elemTokenPtr+1, varTokenPtr+2, (n-1) * sizeof(Tcl_Token)); } else { /* * Use the already available tokens. */ elemTokenPtr = &varTokenPtr[2]; elemTokenCount = n - 1; } } } if (simpleVarName) { /* * See whether name has any namespace separators (::'s). */ int hasNsQualifiers = 0; for (i = 0, p = name; i < nameChars; i++, p++) { if ((*p == ':') && ((i+1) < nameChars) && (*(p+1) == ':')) { hasNsQualifiers = 1; break; } } /* * Look up the var name's index in the array of local vars in the proc * frame. If retrieving the var's value and it doesn't already exist, * push its name and look it up at runtime. */ if (!hasNsQualifiers) { localIndex = TclFindCompiledLocal(name, nameChars, 1, envPtr); if ((flags & TCL_NO_LARGE_INDEX) && (localIndex > 255)) { /* * We'll push the name. */ localIndex = -1; } } if (localIndex < 0) { PushLiteral(envPtr, name, nameChars); } /* * Compile the element script, if any. */ if (elName != NULL) { if (elNameChars) { envPtr->line = line; envPtr->clNext = clNext; TclCompileTokens(interp, elemTokenPtr, elemTokenCount, envPtr); } else { PushLiteral(envPtr, "", 0); } } } else { /* * The var name isn't simple: compile and push it. */ envPtr->line = line; envPtr->clNext = clNext; CompileTokens(envPtr, varTokenPtr, interp); } if (removedParen) { varTokenPtr[removedParen].size++; } if (allocedTokens) { TclStackFree(interp, elemTokenPtr); } *localIndexPtr = localIndex; *simpleVarNamePtr = simpleVarName; *isScalarPtr = (elName == NULL); return TCL_OK; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */