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Overview
Comment:Added new tools for managing and verifying the stack depth during compilation. Used it in some spots in the compiler and in TclCompileCatchCommand.
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SHA1: c91b235146f0956b8f38e98acc266433ea4211cc
User & Date: mig 2013-12-23 11:28:12
Context
2013-12-31
10:47
remove ill-advised change to assembler

What made sense for the compiler does not for the assemble... check-in: eabc1b8699 user: dkf tags: trunk

2013-12-30
16:36
merge trunk Closed-Leaf check-in: 014940909e user: dgp tags: dkf/asm-crash-20131022
2013-12-27
21:00
merge trunk check-in: 4eca9283c9 user: dgp tags: dgp-refactor
2013-12-26
15:25
remove uninitialized variable and the code that used it

DKF: very ill-advised; changes semantics ... Closed-Leaf check-in: 996c4a1cda user: mig tags: dkf-review

2013-12-23
18:32
merge trunk check-in: 9dfb1c05dd user: dkf tags: dkf-bytecode-8.6-main
11:42
merge new stack checking tools for the compiler check-in: 3729db90cb user: mig tags: mig-optimize
11:28
Added new tools for managing and verifying the stack depth during compilation. Used it in some spots... check-in: c91b235146 user: mig tags: trunk
2013-12-22
14:11
remove unnecessary messing around INST_CONTINUE and INST_BREAK: local continue/break are already con... check-in: 6e3a672696 user: mig tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to generic/tclCompCmds.c.

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				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    JumpFixup jumpFixup;
    Tcl_Token *cmdTokenPtr, *resultNameTokenPtr, *optsNameTokenPtr;
    int resultIndex, optsIndex, range, dropScript = 0;
    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;







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				 * compiled. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    JumpFixup jumpFixup;
    Tcl_Token *cmdTokenPtr, *resultNameTokenPtr, *optsNameTokenPtr;
    int resultIndex, optsIndex, range, dropScript = 0;
    DefineLineInformation;	/* TIP #280 */
    int depth = TclGetStackDepth(envPtr);
    
    /*
     * 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;
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	/* drop the script */
	dropScript = 1;
	TclEmitInstInt4(	INST_REVERSE, 2,		envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);
    }
    ExceptionRangeEnds(envPtr, range);


    /*
     * Emit the "no errors" epilogue: push "0" (TCL_OK) as the catch result,
     * and jump around the "error case" code.
     */


    PushStringLiteral(envPtr, "0");
    TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpFixup);

    /* 
     * Emit the "error case" epilogue. Push the interpreter result and the
     * return code.
     */

    TclAdjustStackDepth(-2 + dropScript, envPtr);
    ExceptionRangeTarget(envPtr, range, catchOffset);


    if (dropScript) {
	TclEmitOpcode(		INST_POP,			envPtr);
    }


    /* Stack at this point is empty */
    TclEmitOpcode(		INST_PUSH_RESULT,		envPtr);
    TclEmitOpcode(		INST_PUSH_RETURN_CODE,		envPtr);

    /* Stack at this point on both branches: result returnCode */








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	/* drop the script */
	dropScript = 1;
	TclEmitInstInt4(	INST_REVERSE, 2,		envPtr);
	TclEmitOpcode(		INST_POP,			envPtr);
    }
    ExceptionRangeEnds(envPtr, range);

    
    /*
     * Emit the "no errors" epilogue: push "0" (TCL_OK) as the catch result,
     * and jump around the "error case" code.
     */

    TclCheckStackDepth(depth+1, envPtr);
    PushStringLiteral(envPtr, "0");
    TclEmitForwardJump(envPtr, TCL_UNCONDITIONAL_JUMP, &jumpFixup);

    /* 
     * Emit the "error case" epilogue. Push the interpreter result and the
     * return code.
     */


    ExceptionRangeTarget(envPtr, range, catchOffset);
    TclSetStackDepth(depth + dropScript, envPtr);
    
    if (dropScript) {
	TclEmitOpcode(		INST_POP,			envPtr);
    }


    /* Stack at this point is empty */
    TclEmitOpcode(		INST_PUSH_RESULT,		envPtr);
    TclEmitOpcode(		INST_PUSH_RETURN_CODE,		envPtr);

    /* Stack at this point on both branches: result returnCode */

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    TclEmitInstInt4(	INST_REVERSE, 2,		envPtr);
    if (resultIndex != -1) {
	Emit14Inst(	INST_STORE_SCALAR, resultIndex,	envPtr);
    }
    TclEmitOpcode(	INST_POP,			envPtr);


    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileContinueCmd --







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    TclEmitInstInt4(	INST_REVERSE, 2,		envPtr);
    if (resultIndex != -1) {
	Emit14Inst(	INST_STORE_SCALAR, resultIndex,	envPtr);
    }
    TclEmitOpcode(	INST_POP,			envPtr);

    TclCheckStackDepth(depth+1, envPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileContinueCmd --

Changes to generic/tclCompile.c.

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TclCompileInvocation(
    Tcl_Interp *interp,
    Tcl_Token *tokenPtr,
    Tcl_Obj *cmdObj,
    int numWords,
    CompileEnv *envPtr)
{
    int wordIdx = 0;
    DefineLineInformation;

    if (cmdObj) {
	CompileCmdLiteral(interp, cmdObj, envPtr);
	wordIdx = 1;
	tokenPtr = TokenAfter(tokenPtr);
    }







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TclCompileInvocation(
    Tcl_Interp *interp,
    Tcl_Token *tokenPtr,
    Tcl_Obj *cmdObj,
    int numWords,
    CompileEnv *envPtr)
{
    int wordIdx = 0, depth = TclGetStackDepth(envPtr);
    DefineLineInformation;

    if (cmdObj) {
	CompileCmdLiteral(interp, cmdObj, envPtr);
	wordIdx = 1;
	tokenPtr = TokenAfter(tokenPtr);
    }
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    }

    if (wordIdx <= 255) {
	TclEmitInvoke(envPtr, INST_INVOKE_STK1, wordIdx);
    } else {
	TclEmitInvoke(envPtr, INST_INVOKE_STK4, wordIdx);
    }

}

static void
CompileExpanded(
    Tcl_Interp *interp,
    Tcl_Token *tokenPtr,
    Tcl_Obj *cmdObj,
    int numWords,
    CompileEnv *envPtr)
{
    int wordIdx = 0;
    DefineLineInformation;


    StartExpanding(envPtr);
    if (cmdObj) {
	CompileCmdLiteral(interp, cmdObj, envPtr);
	wordIdx = 1;
	tokenPtr = TokenAfter(tokenPtr);
    }








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    }

    if (wordIdx <= 255) {
	TclEmitInvoke(envPtr, INST_INVOKE_STK1, wordIdx);
    } else {
	TclEmitInvoke(envPtr, INST_INVOKE_STK4, wordIdx);
    }
    TclCheckStackDepth(depth+1, envPtr);
}

static void
CompileExpanded(
    Tcl_Interp *interp,
    Tcl_Token *tokenPtr,
    Tcl_Obj *cmdObj,
    int numWords,
    CompileEnv *envPtr)
{
    int wordIdx = 0;
    DefineLineInformation;
    int depth = TclGetStackDepth(envPtr);
    
    StartExpanding(envPtr);
    if (cmdObj) {
	CompileCmdLiteral(interp, cmdObj, envPtr);
	wordIdx = 1;
	tokenPtr = TokenAfter(tokenPtr);
    }

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     * stack top changes by (1-wordIdx).
     *
     * Note that the estimates are not correct while the command is being
     * prepared and run, INST_EXPAND_STKTOP is not stack-neutral in general.
     */

    TclEmitInvoke(envPtr, INST_INVOKE_EXPANDED, wordIdx);

}

static int 
CompileCmdCompileProc(
    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    Command *cmdPtr,
    CompileEnv *envPtr)
{
    int unwind = 0, incrOffset = -1;
    DefineLineInformation;


    /*
     * Emit of the INST_START_CMD instruction is controlled by the value of
     * envPtr->atCmdStart:
     *
     * atCmdStart == 2	: We are not using the INST_START_CMD instruction.
     * atCmdStart == 1	: INST_START_CMD was the last instruction emitted.







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     * stack top changes by (1-wordIdx).
     *
     * Note that the estimates are not correct while the command is being
     * prepared and run, INST_EXPAND_STKTOP is not stack-neutral in general.
     */

    TclEmitInvoke(envPtr, INST_INVOKE_EXPANDED, wordIdx);
    TclCheckStackDepth(depth+1, envPtr);
}

static int 
CompileCmdCompileProc(
    Tcl_Interp *interp,
    Tcl_Parse *parsePtr,
    Command *cmdPtr,
    CompileEnv *envPtr)
{
    int unwind = 0, incrOffset = -1;
    DefineLineInformation;
    int depth = TclGetStackDepth(envPtr);

    /*
     * Emit of the INST_START_CMD instruction is controlled by the value of
     * envPtr->atCmdStart:
     *
     * atCmdStart == 2	: We are not using the INST_START_CMD instruction.
     * atCmdStart == 1	: INST_START_CMD was the last instruction emitted.
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	    TclIncrUInt4AtPtr(incrPtr, 1);
	    if (unwind) {
		/* We started the INST_START_CMD.  Record the code length. */
		TclStoreInt4AtPtr(envPtr->codeNext - startPtr, startPtr + 1);
	    }
	}

	return TCL_OK;
    }

    envPtr->codeNext -= unwind; /* Unwind INST_START_CMD */

    /*
     * Throw out any line information generated by the failed compile attempt.







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	    TclIncrUInt4AtPtr(incrPtr, 1);
	    if (unwind) {
		/* We started the INST_START_CMD.  Record the code length. */
		TclStoreInt4AtPtr(envPtr->codeNext - startPtr, startPtr + 1);
	    }
	}
	TclCheckStackDepth(depth+1, envPtr);
	return TCL_OK;
    }

    envPtr->codeNext -= unwind; /* Unwind INST_START_CMD */

    /*
     * Throw out any line information generated by the failed compile attempt.
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    int code = TCL_ERROR;
    int cmdKnown, expand = -1;
    int *wlines, wlineat;
    int cmdLine = envPtr->line;
    int *clNext = envPtr->clNext;
    int cmdIdx = envPtr->numCommands;
    int startCodeOffset = envPtr->codeNext - envPtr->codeStart;


    assert (parsePtr->numWords > 0);

    /* Pre-Compile */

    envPtr->numCommands++;
    EnterCmdStartData(envPtr, cmdIdx,
	    parsePtr->commandStart - envPtr->source, startCodeOffset);







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    int code = TCL_ERROR;
    int cmdKnown, expand = -1;
    int *wlines, wlineat;
    int cmdLine = envPtr->line;
    int *clNext = envPtr->clNext;
    int cmdIdx = envPtr->numCommands;
    int startCodeOffset = envPtr->codeNext - envPtr->codeStart;
    int depth = TclGetStackDepth(envPtr);
    
    assert (parsePtr->numWords > 0);

    /* Pre-Compile */

    envPtr->numCommands++;
    EnterCmdStartData(envPtr, cmdIdx,
	    parsePtr->commandStart - envPtr->source, startCodeOffset);
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    envPtr->line = cmdLine;
    envPtr->clNext = clNext;
    ckfree(eclPtr->loc[wlineat].line);
    ckfree(eclPtr->loc[wlineat].next);
    eclPtr->loc[wlineat].line = wlines;
    eclPtr->loc[wlineat].next = NULL;


    return cmdIdx;
}

void
TclCompileScript(
    Tcl_Interp *interp,		/* Used for error and status reporting. Also
				 * serves as context for finding and compiling
				 * commands. May not be NULL. */
    const char *script,		/* The source script to compile. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first null character. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    int lastCmdIdx = -1;	/* Index into envPtr->cmdMapPtr of the last
				 * command this routine compiles into bytecode.
				 * Initial value of -1 indicates this routine
				 * has not yet generated any bytecode. */
    const char *p = script;	/* Where we are in our compile. */


    if (envPtr->iPtr == NULL) {
	Tcl_Panic("TclCompileScript() called on uninitialized CompileEnv");
    }

    /* Each iteration compiles one command from the script. */








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    envPtr->line = cmdLine;
    envPtr->clNext = clNext;
    ckfree(eclPtr->loc[wlineat].line);
    ckfree(eclPtr->loc[wlineat].next);
    eclPtr->loc[wlineat].line = wlines;
    eclPtr->loc[wlineat].next = NULL;

    TclCheckStackDepth(depth, envPtr);
    return cmdIdx;
}

void
TclCompileScript(
    Tcl_Interp *interp,		/* Used for error and status reporting. Also
				 * serves as context for finding and compiling
				 * commands. May not be NULL. */
    const char *script,		/* The source script to compile. */
    int numBytes,		/* Number of bytes in script. If < 0, the
				 * script consists of all bytes up to the
				 * first null character. */
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    int lastCmdIdx = -1;	/* Index into envPtr->cmdMapPtr of the last
				 * command this routine compiles into bytecode.
				 * Initial value of -1 indicates this routine
				 * has not yet generated any bytecode. */
    const char *p = script;	/* Where we are in our compile. */
    int depth = TclGetStackDepth(envPtr);

    if (envPtr->iPtr == NULL) {
	Tcl_Panic("TclCompileScript() called on uninitialized CompileEnv");
    }

    /* Each iteration compiles one command from the script. */

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	 * here removes that trailing INST_POP.
	 */

	envPtr->cmdMapPtr[lastCmdIdx].numCodeBytes--;
	envPtr->codeNext--;
	envPtr->currStackDepth++;
    }

}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileTokens --
 *







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	 * here removes that trailing INST_POP.
	 */

	envPtr->cmdMapPtr[lastCmdIdx].numCodeBytes--;
	envPtr->codeNext--;
	envPtr->currStackDepth++;
    }
    TclCheckStackDepth(depth+1, envPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileTokens --
 *
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				 * TCL_TOKEN_TEXT, TCL_TOKEN_BS tokens. */
    char buffer[TCL_UTF_MAX];
    int i, numObjsToConcat, length, adjust;
    unsigned char *entryCodeNext = envPtr->codeNext;
#define NUM_STATIC_POS 20
    int isLiteral, maxNumCL, numCL;
    int *clPosition = NULL;


    /*
     * For the handling of continuation lines in literals we first check if
     * this is actually a literal. For if not we can forego the additional
     * processing. Otherwise we pre-allocate a small table to store the
     * locations of all continuation lines we find in this literal, if any.
     * The table is extended if needed.







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				 * TCL_TOKEN_TEXT, TCL_TOKEN_BS tokens. */
    char buffer[TCL_UTF_MAX];
    int i, numObjsToConcat, length, adjust;
    unsigned char *entryCodeNext = envPtr->codeNext;
#define NUM_STATIC_POS 20
    int isLiteral, maxNumCL, numCL;
    int *clPosition = NULL;
    int depth = TclGetStackDepth(envPtr);

    /*
     * For the handling of continuation lines in literals we first check if
     * this is actually a literal. For if not we can forego the additional
     * processing. Otherwise we pre-allocate a small table to store the
     * locations of all continuation lines we find in this literal, if any.
     * The table is extended if needed.
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     * Release the temp table we used to collect the locations of continuation
     * lines, if any.
     */

    if (maxNumCL) {
	ckfree(clPosition);
    }

}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileCmdWord --
 *







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     * Release the temp table we used to collect the locations of continuation
     * lines, if any.
     */

    if (maxNumCL) {
	ckfree(clPosition);
    }
    TclCheckStackDepth(depth+1, envPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclCompileCmdWord --
 *
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    ...)
{
    va_list argList;
    ExceptionRange *rangePtr;
    ExceptionAux *auxBreakPtr, *auxContinuePtr;
    int arg1, arg2, wordCount = 0, expandCount = 0;
    int loopRange = 0, breakRange = 0, continueRange = 0;


    /*
     * Parse the arguments.
     */

    va_start(argList, opcode);
    switch (opcode) {
    case INST_INVOKE_STK1:
	wordCount = arg1 = va_arg(argList, int);
	arg2 = 0;
	break;
    case INST_INVOKE_STK4:
	wordCount = arg1 = va_arg(argList, int);
	arg2 = 0;
	break;
    case INST_INVOKE_REPLACE:
	arg1 = va_arg(argList, int);
	arg2 = va_arg(argList, int);
	wordCount = arg1 + arg2 - 1;

	break;
    default:
	Tcl_Panic("unexpected opcode");
    case INST_EVAL_STK:
	wordCount = 1;
	arg1 = arg2 = 0;
	break;
    case INST_RETURN_STK:
	wordCount = 2;
	arg1 = arg2 = 0;
	break;
    case INST_INVOKE_EXPANDED:
	wordCount = arg1 = va_arg(argList, int);
	arg2 = 0;
	expandCount = 1;
	break;
    }
    va_end(argList);

    /*







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    ...)
{
    va_list argList;
    ExceptionRange *rangePtr;
    ExceptionAux *auxBreakPtr, *auxContinuePtr;
    int arg1, arg2, wordCount = 0, expandCount = 0;
    int loopRange = 0, breakRange = 0, continueRange = 0;
    int cleanup, depth = TclGetStackDepth(envPtr);
    
    /*
     * Parse the arguments.
     */

    va_start(argList, opcode);
    switch (opcode) {
    case INST_INVOKE_STK1:
	wordCount = arg1 = cleanup = va_arg(argList, int);
	arg2 = 0;
	break;
    case INST_INVOKE_STK4:
	wordCount = arg1 = cleanup = va_arg(argList, int);
	arg2 = 0;
	break;
    case INST_INVOKE_REPLACE:
	arg1 = va_arg(argList, int);
	arg2 = va_arg(argList, int);
	wordCount = arg1 + arg2 - 1;
	cleanup = arg1 + 1;
	break;
    default:
	Tcl_Panic("unexpected opcode");
    case INST_EVAL_STK:
	wordCount = cleanup = 1;
	arg1 = arg2 = 0;
	break;
    case INST_RETURN_STK:
	wordCount = cleanup = 2;
	arg1 = arg2 = 0;
	break;
    case INST_INVOKE_EXPANDED:
	wordCount = arg1 = cleanup = va_arg(argList, int);
	arg2 = 0;
	expandCount = 1;
	break;
    }
    va_end(argList);

    /*
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	if (auxBreakPtr != NULL) {
	    TclAdjustStackDepth(-1, envPtr);

	    ExceptionRangeTarget(envPtr, loopRange, breakOffset);
	    TclCleanupStackForBreakContinue(envPtr, auxBreakPtr);
	    TclAddLoopBreakFixup(envPtr, auxBreakPtr);


	    envPtr->currStackDepth = savedStackDepth;
	    envPtr->expandCount = savedExpandCount;
	}

	if (auxContinuePtr != NULL) {
	    TclAdjustStackDepth(-1, envPtr);

	    ExceptionRangeTarget(envPtr, loopRange, continueOffset);
	    TclCleanupStackForBreakContinue(envPtr, auxContinuePtr);
	    TclAddLoopContinueFixup(envPtr, auxContinuePtr);


	    envPtr->currStackDepth = savedStackDepth;
	    envPtr->expandCount = savedExpandCount;
	}

	TclFinalizeLoopExceptionRange(envPtr, loopRange);
	TclFixupForwardJumpToHere(envPtr, &nonTrapFixup, 127);
    }

}

/*
 *----------------------------------------------------------------------
 *
 * TclGetInstructionTable --
 *







>











>








>







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	if (auxBreakPtr != NULL) {
	    TclAdjustStackDepth(-1, envPtr);

	    ExceptionRangeTarget(envPtr, loopRange, breakOffset);
	    TclCleanupStackForBreakContinue(envPtr, auxBreakPtr);
	    TclAddLoopBreakFixup(envPtr, auxBreakPtr);
	    TclAdjustStackDepth(1, envPtr);

	    envPtr->currStackDepth = savedStackDepth;
	    envPtr->expandCount = savedExpandCount;
	}

	if (auxContinuePtr != NULL) {
	    TclAdjustStackDepth(-1, envPtr);

	    ExceptionRangeTarget(envPtr, loopRange, continueOffset);
	    TclCleanupStackForBreakContinue(envPtr, auxContinuePtr);
	    TclAddLoopContinueFixup(envPtr, auxContinuePtr);
	    TclAdjustStackDepth(1, envPtr);

	    envPtr->currStackDepth = savedStackDepth;
	    envPtr->expandCount = savedExpandCount;
	}

	TclFinalizeLoopExceptionRange(envPtr, loopRange);
	TclFixupForwardJumpToHere(envPtr, &nonTrapFixup, 127);
    }
    TclCheckStackDepth(depth+1-cleanup, envPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetInstructionTable --
 *

Changes to generic/tclCompile.h.

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	if ((delta) < 0) {						\
	    if ((envPtr)->maxStackDepth < (envPtr)->currStackDepth) {	\
		(envPtr)->maxStackDepth = (envPtr)->currStackDepth;	\
	    }								\
	}								\
	(envPtr)->currStackDepth += (delta);				\
    } while (0)
















/*
 * Macro used to update the stack requirements. It is called by the macros
 * TclEmitOpCode, TclEmitInst1 and TclEmitInst4.
 * Remark that the very last instruction of a bytecode always reduces the
 * stack level: INST_DONE or INST_POP, so that the maxStackdepth is always
 * updated.







>
>
>
>
>
>
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>
>
>







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	if ((delta) < 0) {						\
	    if ((envPtr)->maxStackDepth < (envPtr)->currStackDepth) {	\
		(envPtr)->maxStackDepth = (envPtr)->currStackDepth;	\
	    }								\
	}								\
	(envPtr)->currStackDepth += (delta);				\
    } while (0)

#define TclGetStackDepth(envPtr)		\
    ((envPtr)->currStackDepth)

#define TclSetStackDepth(depth, envPtr)		\
    (envPtr)->currStackDepth = (depth)

#define TclCheckStackDepth(depth, envPtr)				\
    do {								\
	int dd = (depth);						\
	if (dd != (envPtr)->currStackDepth) {				\
	    Tcl_Panic("bad stack depth computations: is %i, should be %i", \
		    (envPtr)->currStackDepth, dd);		\
	}								\
    } while (0)

/*
 * Macro used to update the stack requirements. It is called by the macros
 * TclEmitOpCode, TclEmitInst1 and TclEmitInst4.
 * Remark that the very last instruction of a bytecode always reduces the
 * stack level: INST_DONE or INST_POP, so that the maxStackdepth is always
 * updated.