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authordgp <dgp@users.sourceforge.net>2013-06-11 16:44:34 (GMT)
committerdgp <dgp@users.sourceforge.net>2013-06-11 16:44:34 (GMT)
commiteee0c67ac8f3ae799c0222a6b0c4ad25c757b7e5 (patch)
tree3955177c31b2f3c7bd87fef418f9603443834981 /generic
parent70891d45411fa4695f4620b26dda06e94143967e (diff)
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[33b7abb8a2] [7174354ecb] Rewrite TclCompileThrowCmd().
Diffstat (limited to 'generic')
-rw-r--r--generic/tclCompCmdsSZ.c105
1 files changed, 46 insertions, 59 deletions
diff --git a/generic/tclCompCmdsSZ.c b/generic/tclCompCmdsSZ.c
index 5d67166..b9ee1d4 100644
--- a/generic/tclCompCmdsSZ.c
+++ b/generic/tclCompCmdsSZ.c
@@ -1942,9 +1942,9 @@ TclCompileThrowCmd(
{
DefineLineInformation; /* TIP #280 */
int numWords = parsePtr->numWords;
- int savedStackDepth = envPtr->currStackDepth;
Tcl_Token *codeToken, *msgToken;
Tcl_Obj *objPtr;
+ int codeKnown, codeIsList, codeIsValid, len;
if (numWords != 3) {
return TCL_ERROR;
@@ -1954,77 +1954,64 @@ TclCompileThrowCmd(
TclNewObj(objPtr);
Tcl_IncrRefCount(objPtr);
- if (TclWordKnownAtCompileTime(codeToken, objPtr)) {
- Tcl_Obj *errPtr, *dictPtr;
- const char *string;
- int len;
- /*
- * The code is known at compilation time. This allows us to issue a
- * very efficient sequence of instructions.
- */
+ codeKnown = TclWordKnownAtCompileTime(codeToken, objPtr);
- if (Tcl_ListObjLength(interp, objPtr, &len) != TCL_OK) {
- /*
- * Must still do this; might generate an error when getting this
- * "ignored" value prepared as an argument.
- */
+ /*
+ * First we must emit the code to substitute the arguments. This
+ * must come first in case substitution raises errors.
+ */
+ if (!codeKnown) {
+ CompileWord(envPtr, codeToken, interp, 1);
+ PUSH( "-errorcode");
+ }
+ CompileWord(envPtr, msgToken, interp, 2);
- CompileWord(envPtr, msgToken, interp, 2);
- TclCompileSyntaxError(interp, envPtr);
- Tcl_DecrRefCount(objPtr);
- envPtr->currStackDepth = savedStackDepth + 1;
- return TCL_OK;
- }
- if (len == 0) {
- /*
- * Must still do this; might generate an error when getting this
- * "ignored" value prepared as an argument.
- */
+ codeIsList = codeKnown && (TCL_OK ==
+ Tcl_ListObjLength(interp, objPtr, &len));
+ codeIsValid = codeIsList && (len != 0);
+
+ if (codeIsValid) {
+ Tcl_Obj *errPtr, *dictPtr;
- CompileWord(envPtr, msgToken, interp, 2);
- goto issueErrorForEmptyCode;
- }
TclNewLiteralStringObj(errPtr, "-errorcode");
TclNewObj(dictPtr);
Tcl_DictObjPut(NULL, dictPtr, errPtr, objPtr);
- Tcl_IncrRefCount(dictPtr);
- string = Tcl_GetStringFromObj(dictPtr, &len);
- CompileWord(envPtr, msgToken, interp, 2);
- PushLiteral(envPtr, string, len);
- TclDecrRefCount(dictPtr);
- OP44( RETURN_IMM, 1, 0);
- envPtr->currStackDepth = savedStackDepth + 1;
- } else {
- /*
- * When the code token is not known at compilation time, we need to do
- * a little bit more work. The main tricky bit here is that the error
- * code has to be a list (a [throw] restriction) so we must emit extra
- * instructions to enforce that condition.
- */
+ TclEmitPush(TclAddLiteralObj(envPtr, dictPtr, NULL), envPtr);
+ }
+ TclDecrRefCount(objPtr);
- CompileWord(envPtr, codeToken, interp, 1);
- PUSH( "-errorcode");
- CompileWord(envPtr, msgToken, interp, 2);
- OP4( REVERSE, 3);
- OP( DUP);
- OP( LIST_LENGTH);
- OP1( JUMP_FALSE1, 16);
- OP4( LIST, 2);
- OP44( RETURN_IMM, 1, 0);
+ /*
+ * Simpler bytecodes when we detect invalid arguments at compile time.
+ */
+ if (codeKnown && !codeIsValid) {
+ OP( POP);
+ if (codeIsList) {
+ /* Must be an empty list */
+ goto issueErrorForEmptyCode;
+ }
+ TclCompileSyntaxError(interp, envPtr);
+ return TCL_OK;
+ }
+ if (!codeKnown) {
/*
- * Generate an error for being an empty list. Can't leverage anything
- * else to do this for us.
+ * Argument validity checking has to be done by bytecode at
+ * run time.
*/
-
+ OP4( REVERSE, 3);
+ OP( DUP);
+ OP( LIST_LENGTH);
+ OP1( JUMP_FALSE1, 16);
+ OP4( LIST, 2);
+ OP44( RETURN_IMM, 1, 0);
+ OP( POP);
+ OP( POP);
issueErrorForEmptyCode:
- PUSH( "type must be non-empty list");
- PUSH( "");
- OP44( RETURN_IMM, 1, 0);
+ PUSH( "type must be non-empty list");
+ PUSH( "-errorcode {TCL OPERATION THROW BADEXCEPTION}");
}
- envPtr->currStackDepth = savedStackDepth + 1;
- TclDecrRefCount(objPtr);
+ OP44( RETURN_IMM, 1, 0);
return TCL_OK;
}