diff options
Diffstat (limited to 'generic/tclExecute.c')
| -rw-r--r-- | generic/tclExecute.c | 134 |
1 files changed, 103 insertions, 31 deletions
diff --git a/generic/tclExecute.c b/generic/tclExecute.c index c0deb73..c258a94 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.c @@ -11,7 +11,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclExecute.c,v 1.94.2.22 2007/09/13 15:28:12 das Exp $ + * RCS: @(#) $Id: tclExecute.c,v 1.94.2.23 2008/03/07 21:10:09 dgp Exp $ */ #include "tclInt.h" @@ -356,6 +356,8 @@ long tclObjsShared[TCL_MAX_SHARED_OBJ_STATS] = { 0, 0, 0, 0, 0 }; static int TclExecuteByteCode _ANSI_ARGS_((Tcl_Interp *interp, ByteCode *codePtr)); +static void DupExprCodeInternalRep _ANSI_ARGS_((Tcl_Obj *srcPtr, + Tcl_Obj *copyPtr)); static int ExprAbsFunc _ANSI_ARGS_((Tcl_Interp *interp, ExecEnv *eePtr, ClientData clientData)); static int ExprBinaryFunc _ANSI_ARGS_((Tcl_Interp *interp, @@ -381,6 +383,7 @@ static int EvalStatsCmd _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])); #endif /* TCL_COMPILE_STATS */ +static void FreeExprCodeInternalRep _ANSI_ARGS_ ((Tcl_Obj *objPtr)); #ifdef TCL_COMPILE_DEBUG static char * GetOpcodeName _ANSI_ARGS_((unsigned char *pc)); #endif /* TCL_COMPILE_DEBUG */ @@ -405,6 +408,19 @@ static int VerifyExprObjType _ANSI_ARGS_((Tcl_Interp *interp, Tcl_Obj *objPtr)); /* + * The structure below defines a bytecode Tcl object type to hold the + * compiled bytecode for Tcl expressions. + */ + +static Tcl_ObjType exprCodeType = { + "exprcode", + FreeExprCodeInternalRep, /* freeIntRepProc */ + DupExprCodeInternalRep, /* dupIntRepProc */ + NULL, /* updateStringProc */ + NULL /* setFromAnyProc */ +}; + +/* * Table describing the built-in math functions. Entries in this table are * indexed by the values of the INST_CALL_BUILTIN_FUNC instruction's * operand byte. @@ -744,34 +760,31 @@ Tcl_ExprObj(interp, objPtr, resultPtrPtr) } /* - * Get the ByteCode from the object. If it exists, make sure it hasn't - * been invalidated by, e.g., someone redefining a command with a - * compile procedure (this might make the compiled code wrong). If - * necessary, convert the object to be a ByteCode object and compile it. - * Also, if the code was compiled in/for a different interpreter, we - * recompile it. - * - * Precompiled expressions, however, are immutable and therefore - * they are not recompiled, even if the epoch has changed. - * + * Compile and execute the expression after saving the interp's result. + */ + + saveObjPtr = Tcl_GetObjResult(interp); + Tcl_IncrRefCount(saveObjPtr); + + /* + * Get the expression ByteCode from the object. If it exists, make sure it + * is valid in the curren context. */ - if (objPtr->typePtr == &tclByteCodeType) { + if (objPtr->typePtr == &exprCodeType) { + Namespace *namespacePtr = iPtr->varFramePtr ? + iPtr->varFramePtr->nsPtr : iPtr->globalNsPtr; + codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr; if (((Interp *) *codePtr->interpHandle != iPtr) - || (codePtr->compileEpoch != iPtr->compileEpoch)) { - if (codePtr->flags & TCL_BYTECODE_PRECOMPILED) { - if ((Interp *) *codePtr->interpHandle != iPtr) { - panic("Tcl_ExprObj: compiled expression jumped interps"); - } - codePtr->compileEpoch = iPtr->compileEpoch; - } else { - (*tclByteCodeType.freeIntRepProc)(objPtr); - objPtr->typePtr = (Tcl_ObjType *) NULL; - } + || (codePtr->compileEpoch != iPtr->compileEpoch) + || (codePtr->nsPtr != namespacePtr) + || (codePtr->nsEpoch != namespacePtr->resolverEpoch)) { + objPtr->typePtr->freeIntRepProc(objPtr); + objPtr->typePtr = (Tcl_ObjType *) NULL; } } - if (objPtr->typePtr != &tclByteCodeType) { + if (objPtr->typePtr != &exprCodeType) { #ifndef TCL_TIP280 TclInitCompileEnv(interp, &compEnv, string, length); #else @@ -836,6 +849,7 @@ Tcl_ExprObj(interp, objPtr, resultPtrPtr) compEnv.numSrcBytes = iPtr->termOffset; TclEmitOpcode(INST_DONE, &compEnv); TclInitByteCodeObj(objPtr, &compEnv); + objPtr->typePtr = &exprCodeType; TclFreeCompileEnv(&compEnv); codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr; #ifdef TCL_COMPILE_DEBUG @@ -845,12 +859,6 @@ Tcl_ExprObj(interp, objPtr, resultPtrPtr) #endif /* TCL_COMPILE_DEBUG */ } - /* - * Execute the expression after first saving the interpreter's result. - */ - - saveObjPtr = Tcl_GetObjResult(interp); - Tcl_IncrRefCount(saveObjPtr); Tcl_ResetResult(interp); /* @@ -863,8 +871,6 @@ Tcl_ExprObj(interp, objPtr, resultPtrPtr) codePtr->refCount--; if (codePtr->refCount <= 0) { TclCleanupByteCode(codePtr); - objPtr->typePtr = NULL; - objPtr->internalRep.otherValuePtr = NULL; } /* @@ -889,6 +895,72 @@ Tcl_ExprObj(interp, objPtr, resultPtrPtr) /* *---------------------------------------------------------------------- * + * DupExprCodeInternalRep -- + * + * Part of the Tcl object type implementation for Tcl expression + * bytecode. We do not copy the bytecode intrep. Instead, we + * return with setting copyPtr->typePtr, so the copy is a plain + * string copy of the expression value, and if it is to be used + * as a compiled expression, it will just need a recompile. + * + * This makes sense, because with Tcl's copy-on-write practices, + * the usual (only?) time Tcl_DuplicateObj() will be called is + * when the copy is about to be modified, which would invalidate + * any copied bytecode anyway. The only reason it might make sense + * to copy the bytecode is if we had some modifying routines that + * operated directly on the intrep, like we do for lists and dicts. + * + * Results: + * None. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +static void +DupExprCodeInternalRep( + Tcl_Obj *srcPtr, + Tcl_Obj *copyPtr) +{ + return; +} + +/* + *---------------------------------------------------------------------- + * + * FreeExprCodeInternalRep -- + * + * Part of the Tcl object type implementation for Tcl expression + * bytecode. Frees the storage allocated to hold the internal rep, + * unless ref counts indicate bytecode execution is still in progress. + * + * Results: + * None. + * + * Side effects: + * May free allocated memory. Leaves objPtr untyped. + *---------------------------------------------------------------------- + */ + +static void +FreeExprCodeInternalRep( + Tcl_Obj *objPtr) +{ + ByteCode *codePtr = (ByteCode *) objPtr->internalRep.otherValuePtr; + + codePtr->refCount--; + if (codePtr->refCount <= 0) { + TclCleanupByteCode(codePtr); + } + objPtr->typePtr = NULL; + objPtr->internalRep.otherValuePtr = NULL; +} + +/* + *---------------------------------------------------------------------- + * * TclCompEvalObj -- * * This procedure evaluates the script contained in a Tcl_Obj by |