Mumps Class 21

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sam@sam-desktop:~$ cd pocn-moh/
sam@sam-desktop:~/pocn-moh$ . run_utf8
sam@sam-desktop:~/pocn-moh$ mumps -dir

GTM>; WHY DO ERRORS HAPPEN? WHY WHY???

GTM>; 1. Invalid Syntax (doesn't happen; usually caught by compiler)

GTM>; (except, if you are compiling while executing)

GTM>; 2. Invalid [[action~|Action]] (happens a lot!!). E.g. Write 1/0

GTM>; 3. External issue that cuases the process to not be able to continue

GTM>; e.g. Hard disk runs out of space; Transaction is not restartable and s
omebody else is playing with the global

GTM>; e.g. You run out of lock space

GTM>; What does error processing do?

GTM>; 1. Try to fix the error to allow normal processing

GTM>; 2. Abandon processing for this block, but resume processing where you
left off

GTM>; 3. [[Record~|Record]] error and stop

GTM>; 4. Just end the process

GTM>; there is no try/catch in Mumps

GTM>; Instead, there is another way of trapping errors, more like VBA

GTM>; Mumps uses $ECODE, $ETRAP, and $ESTACK to process errors.

GTM>; Example of an Error Trap

GTM>zed "ZU"

GTM>zed "XWBTCPM"

GTM>zed "KBANERR"

GTM>zl

GTM>zp SIMPLEERR^KBANERR:SIMPLERR+3
%GTM-E-ZPRTLABNOTFND, Label not found in routine

GTM>ZED

GTM>zp SIMPLEERR^KBANERR:SIMPLEERR+3
SIMPLEERR
 W 1/0
 QUIT

GTM>D SIMPLEERR^KBANERR
%GTM-E-DIVZERO, Attempt to divide by zero
                At M source location SIMPLEERR+1^KBANERR

GTM>ZSHOW
SIMPLEERR+1^KBANERR    ($ZTRAP)
    (Direct mode)
+1^GTM$DMOD    (Direct mode)

GTM>D ^%ZTER

GTM>; ^%ZTER logs the error in the VISTA error trap!!!

GTM>; To view the error trap in VISTA, run ^XTER, or the menu option that

GTM>; does that

GTM>D ^XTER


In response to the DATE prompt you can enter:
     'S' to specify text to be matched in error or routine name


1 error logged on 4/11/2011
  1)  <(DIVZERO)>SIMPLEERR+1^KBANERR  09:44:34  EHR,EHR     4851  /dev/pts/3

No screened error

     Enter '^' to quit listing, <RETURN> to continue...: 1

Process ID:  4851  (4851)               APR 11, 2011 09:44:34

UCI/VOL: [EHR,EHR]

$ZA:   0

Current $IO: /dev/pts/3                 Current $ZIO: ^0^12^/dev/pts/3

$ZE= SIMPLEERR+1^KBANERR, Attempt to divide by zero,150373210,-%GTM-E-DIVZERO

 W 1/0

Which symbol? > ?

Enter:
     ^Q to EXIT
     '^' to return to the last question
     Leading character(s) of symbol(s) you wish to examine
     ^L to obtain a list of all symbols
     ^P to select a printer and print this error
     ^M to capture the current error in a mail message
     ^I to obtain information on key package variables
     $ to get a display of the $ system variables

$ZE= SIMPLEERR+1^KBANERR, Attempt to divide by zero,150373210,-%GTM-E-DIVZERO

 W 1/0

Which symbol? > ^L


$DEVICE=
$ECODE=,M9,Z150373210,
$ESTACK=3
$ETRAP=
$QUIT=0
$STACK=3
$STACK(000)=-dir
$STACK(000,"ECODE")=
$STACK(000,"PLACE")=+1^GTM$DMOD
$STACK(000,"MCODE")=
$STACK(001)=DO
$STACK(001,"ECODE")=,M9,Z150373210,
$STACK(001,"PLACE")=SIMPLEERR+1^KBANERR
$STACK(001,"MCODE")= W 1/0
$STACK(002)=
$STACK(002,"ECODE")=
$STACK(002,"PLACE")=
$STACK(002,"MCODE")=
$STACK(003)=
     Enter '^' to quit listing, <RETURN> to continue...:

$STACK(003,"ECODE")=
$STACK(003,"PLACE")=
$STACK(003,"MCODE")=
$X $Y=0 12
$ZV=GT.M V5.4-001 Linux x86
%ZT("^XUTL(""XQ"",$J)")=
%ZTER11I=EHR,EHR
%ZTER11N=1
%ZTER11S=
%ZTER11Z=0
%ZTER12A=0
%ZTER12B=
%ZTERCNT=32
%ZTERH1=62192
%ZTERROR=
%ZTERRT=^%ZTER(1,62192,1,1)
%ZTERSUB=%ZTER11S)
%ZTERVAP=%ZT(
%ZTERVAR=%ZTERVAR
%ZTERZE=SIMPLEERR+1^KBANERR, Attempt to divide by zero,150373210,-%GTM-E-DIVZERO

$ZE= SIMPLEERR+1^KBANERR, Attempt to divide by zero,150373210,-%GTM-E-DIVZERO

 W 1/0

Which symbol? > ?

Enter:
     ^Q to EXIT
     '^' to return to the last question
     Leading character(s) of symbol(s) you wish to examine
     ^L to obtain a list of all symbols
     ^P to select a printer and print this error
     ^M to capture the current error in a mail message
     ^I to obtain information on key package variables
     $ to get a display of the $ system variables

$ZE= SIMPLEERR+1^KBANERR, Attempt to divide by zero,150373210,-%GTM-E-DIVZERO

 W 1/0

Which symbol? >

Which error? >

Which date? >
GTM>

GTM>; Let's see how Mumps uses Error Traps

GTM>; Mumps executes this code whenever an error happens:

GTM>; X $ERAP

GTM>; QUIT:$QUIT "" QUIT

GTM>ZED

GTM>zed

GTM>D ^TMGIDE

Entering TMG IDE.  But first, let's set up an environment...
Please type your name: HAB,SMA ??

Please type your name: HAB,SAM  HABIEL,SAM M     SMH          THE WIZARD
==================================================
Welcome to the TMG debugging environment
==================================================
Options:
   1. Start debugger in THIS window.
   2. Start debugger CONTROLLER for another Process.
   3. Debug, SENDING control to a Controller.
=== Routine: ^KBANERR (DISP+1^KBANERR) =====================================
=== Routine: ^KBANERR (DISP+2^KBANERR) =====================================
=== Routine: ^KBANERR (DISP+3^KBANERR) =====================================
=== Routine: ^KBANERR (CONT+1^KBANERR) =====================================
=== Routine: ^KBANERR (CONT+2^KBANERR) =====================================
 +8  ;
 +9 ERR1 ; Create an error, rescue level
=== Routine: ^KBANERR (ERR+3^KBANERR) ======================================
    KBANERR
 +1 KBANERR ; Routine to illustrate Error Trapping ; 4/11/11 9:43am
 +2  ;;
 +3 ERR
 +4  NEW $ETRAP SET $ETRAP="D ^%ZTER" ; Default Error Trap
 +5  DO ERR1
=== Routine: ^KBANERR (ERR+4^KBANERR) ======================================
    KBANERR
 +1 KBANERR ; Routine to illustrate Error Trapping ; 4/11/11 9:43am
 +2  ;;
 +3 ERR
 +4  NEW $ETRAP SET $ETRAP="D ^%ZTER" ; Default Error Trap
 +5  DO ERR1
 +6  DO ERR2                                                                >+7  QUIT
 +8  ;
 +9 ERR1 ; Create an error, rescue level
 +10 NEW $ETRAP SET $ETRAP="DO TRAP1^KBANERR"
06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)06:53, 24 Apr 2011 (PDT)~
}
[[Action~|Action]] (? for help): step OVER//

$STACK is 7
$ECODE is ,M9,Z150373210,
$ETRAP is HALT
I have been rescued
$STACK is 7
$ECODE is
$ETRAP is HALT

                                                                            (^ to quit) //Leaving TMG debugging environment.  Goodbye.

GTM>; What we learned:

GTM>; Mumps executes the error trap upon an error

GTM>; The existence of an error is identified by a non-empty $ECODE

GTM>; You can use Goto(s) (normally a bad programming practice) in processin
g errors in order to recover from an error.

GTM>; You can tell Mumps that there is no longer any errro by setting $ECODE
 to be empty

GTM>zp ^KBANERR
KBANERR ; Routine to illustrate Error Trapping ; 4/11/11 9:43am
 ;;
ERR
 NEW $ETRAP SET $ETRAP="D ^%ZTER" ; Default Error Trap
 DO ERR1
 DO ERR2
 QUIT
 ;
ERR1 ; Create an error, rescue level
 NEW $ETRAP SET $ETRAP="DO TRAP1^KBANERR"
 ; Dangeous Operation
 WRITE 1/0
 ; End Dangerous Operation
CONT
 WRITE "I have been rescued",!
 DO DISP
 QUIT
ERR2 ; Create an error, rescue level
 NEW $ETRAP SET $ETRAP="GOTO TRAP1^KBANERR"
 ; Dangeous Operation
 WRITE 1/0
 ; End Dangerous Operation
 WRITE "I have been rescued",!
 DO DISP
 QUIT
TRAP1
 NEW $ETRAP SET $ETRAP="HALT"  ; Emergency Error Trap
 DO DISP
 SET $ECODE="" ; Clear Error
 GOTO CONT
DISP
 WRITE "$STACK is ",$STACK,!
 WRITE "$ECODE is ",$ECODE,!
 WRITE "$ETRAP is ",$ETRAP,!
 QUIT
SIMPLEERR
 W 1/0
 QUIT

GTM>; $ECODE

GTM>; $ECODE is set by Mumps when an error happens

GTM>; BUT you as a programmer can create your own errors by setting $ECODE

GTM>; $ECODE format

GTM>; ,M#,

GTM>; ,Z#,

GTM>; ,U#,

GTM>SET $ECODE=",U111,"
%GTM-E-SETECODE, Non-empty value assigned to $ECODE (user-defined error trap)

GTM>SET $ECODE=",Z111,"
%GTM-E-SETECODE, Non-empty value assigned to $ECODE (user-defined error trap)

GTM>SET $ECODE=",M111,"
%GTM-E-SETECODE, Non-empty value assigned to $ECODE (user-defined error trap)

GTM>ZSHOW
SIMPLEERR+1^KBANERR    ($ZTRAP)
    (Direct mode)
+1^GTM$DMOD    (Direct mode)

GTM>SET $ECODE=",U111,"
%GTM-E-SETECODE, Non-empty value assigned to $ECODE (user-defined error trap)

GTM>D ^%ZTER

GTM>ZGT
%GTM-E-INVCMD, Invalid command keyword encountered
        ZGT
        ^-----

GTM>ZGOTO

GTM>D ^XTER


In response to the DATE prompt you can enter:
     'S' to specify text to be matched in error or routine name


2 errors logged on 4/11/2011
  2)  <>                              10:35:44  EHR,EHR     4851  /dev/pts/3
  1)  <(DIVZERO)>SIMPLEERR+1^KBANERR  09:44:34  EHR,EHR     4851  /dev/pts/3

No screened error

     Enter '^' to quit listing, <RETURN> to continue...: 2

Process ID:  4851  (4851)               APR 11, 2011 10:35:44

UCI/VOL: [EHR,EHR]

$ZA:   0                                $ZB: \013

Current $IO: /dev/pts/3                 Current $ZIO: ^0^15^/dev/pts/3

$ZE= ,,,-

 QUIT

Last Global Ref: ^%ZOSF("TRMOFF")

Which symbol? > ^L


$DEVICE=
$ECODE=,U111,Z111,M111,U111,
$ESTACK=3
$ETRAP=
$QUIT=0
$STACK=3
$STACK(000)=-dir
$STACK(000,"ECODE")=
$STACK(000,"PLACE")=+1^GTM$DMOD
$STACK(000,"MCODE")=
$STACK(001)=DO
$STACK(001,"ECODE")=,U111,
$STACK(001,"PLACE")=DISP+4^KBANERR
$STACK(001,"MCODE")= QUIT
$STACK(002)=
$STACK(002,"ECODE")=
$STACK(002,"PLACE")=
$STACK(002,"MCODE")=
$STACK(003)=
     Enter '^' to quit listing, <RETURN> to continue...: ^

$ZE= ,,,-

 QUIT

Last Global Ref: ^%ZOSF("TRMOFF")

Which symbol? >

Which error? >

Which date? >
GTM>; $EC has commas to help you detect the correct error

GTM>W $EC

GTM>S X=",U111,Z111,M111,U111,"

GTM>W X["U11"
1
GTM>W X[",U111,"
1
GTM>W X[",U111,,"
0
GTM>W X[",U111"
1
GTM>W X[",U11,"
0
GTM>; $ESTACK

GTM>; -> $ESTACK tells you how many levels you are in the stack from the l

GTM>; from the last time you newed $ESTACK

GTM>; This helps you unwind the stack until you reach your own level

GTM>; useful will call a lot of other routines and you don't

GTM>; you want to roll back an error that happened in a routine that's

GTM>; far above you.

GTM>; $QUIT

GTM>; $QUIT tells you whether you got called by an extrinsic function or not

GTM>; If you call a routine as a function, $quit is 1

GTM>; if you call it with a Do or Xecute, $quit is 0

GTM>; $STACK

GTM>; $STACK contains the current stack level

GTM>; $STACK(-1) contains the number of levels in the stack

GTM>; $STACK(level,"PLACE/MCODE/ECODE") contains information about

GTM>; the stack

GTM>zed

GTM>zbreak ^KBANERR

GTM>S $ZSTEP="W $T(@$ZPOS),! B"

GTM>ZG

GTM>D ^KBANERR
%GTM-I-BREAKZBA, Break instruction encountered during ZBREAK [[action~|Action]]
                At M source location ERR+1^KBANERR

GTM>ZST INTO
 DO ERR1
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location ERR+2^KBANERR

GTM>ZSHOW "S"
ERR+2^KBANERR
    (Direct mode)
+1^GTM$DMOD    (Direct mode)

GTM>W $STACK
1
GTM>W $STACK(-1)
1
GTM>W $STACK(1)
DO
GTM>W $STACK(1,"MCODE")
 DO ERR1
GTM>W $STACK(1,"ECODE")

GTM>W $STACK(1,"PLACE")
ERR+2^KBANERR
GTM>ZSTEP INTO
 NEW $ETRAP SET $ETRAP="DO TRAP1^KBANERR"
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location ERR1+1^KBANERR

GTM>ZSTEP INTO
 WRITE 1/0
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location ERR1+3^KBANERR

GTM>W $STACK(-1)
2
GTM>; i have 2 level

GTM>W $STACK
2
GTM>; current level is 2

GTM>W $STACK(2)
DO
GTM>; level 2 called using a DO command

GTM>w $STACK(2,"MCODE")
 WRITE 1/0
GTM>; current Mumps code

GTM>zst into
 NEW $ETRAP SET $ETRAP="HALT"  ; Emergency Error Trap
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location TRAP1+1^KBANERR

GTM>zshow
TRAP1+1^KBANERR
    (Direct mode)
ERR1+3^KBANERR    ($ZTRAP)
ERR+2^KBANERR
+1^GTM$DMOD    (Direct mode)

GTM>W $STACK(-1)
3
GTM>W $STACK($STACK(-1)-1,"MCODE")
 WRITE 1/0
GTM>W $STACK($STACK(-1)-1,"ECODE")
,M9,Z150373210,
GTM>ZST INTO
 DO DISP
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location TRAP1+2^KBANERR

GTM>ZST INTO
 WRITE "$STACK is ",$STACK,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+1^KBANERR

GTM>ZST INTO
$STACK is 4
 WRITE "$ECODE is ",$ECODE,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+2^KBANERR

GTM>ZST INTO
$ECODE is ,M9,Z150373210,
 WRITE "$ETRAP is ",$ETRAP,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+3^KBANERR

GTM>ZST INTO
$ETRAP is HALT
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+4^KBANERR

GTM>ZST INTO
 SET $ECODE="" ; Clear Error
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location TRAP1+3^KBANERR

GTM>W $STACK
3
GTM>ZST INTO
 GOTO CONT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location TRAP1+4^KBANERR

GTM>ZST INTO
 WRITE "I have been rescued",!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location CONT+1^KBANERR

GTM>W $STACK
3
GTM>ZST INTO
I have been rescued
 DO DISP
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location CONT+2^KBANERR

GTM>ZST INTO
 WRITE "$STACK is ",$STACK,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+1^KBANERR

GTM>ZST INTO
$STACK is 4
 WRITE "$ECODE is ",$ECODE,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+2^KBANERR

GTM>ZST INTO
$ECODE is
 WRITE "$ETRAP is ",$ETRAP,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+3^KBANERR

GTM>ZST INTO
$ETRAP is HALT
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP [[action~|Action]]
                At M source location DISP+4^KBANERR

GTM>ZST INTO
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location CONT+3^KBANERR

GTM>W $STACK
3
GTM>ZP ^KBANERR
KBANERR ; Routine to illustrate Error Trapping ; 4/11/11 9:43am
 ;;
ERR
 NEW $ETRAP SET $ETRAP="D ^%ZTER" ; Default Error Trap
 DO ERR1
 DO ERR2
 QUIT
 ;
ERR1 ; Create an error, rescue level
 NEW $ETRAP SET $ETRAP="DO TRAP1^KBANERR"
 ; Dangeous Operation
 WRITE 1/0
 ; End Dangerous Operation
CONT
 WRITE "I have been rescued",!
 DO DISP
 QUIT
ERR2 ; Create an error, rescue level
 NEW $ETRAP SET $ETRAP="GOTO TRAP1^KBANERR"
 ; Dangeous Operation
 WRITE 1/0
 ; End Dangerous Operation
 WRITE "I have been rescued",!
 DO DISP
 QUIT
TRAP1
 NEW $ETRAP SET $ETRAP="HALT"  ; Emergency Error Trap
 DO DISP
 SET $ECODE="" ; Clear Error
 GOTO CONT
DISP
 WRITE "$STACK is ",$STACK,!
 WRITE "$ECODE is ",$ECODE,!
 WRITE "$ETRAP is ",$ETRAP,!
 QUIT
SIMPLEERR
 W 1/0
 QUIT

GTM>ZST INTO
 DO ERR2
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location ERR+3^KBANERR

GTM>W $STACK
1
GTM>ZST INTO
 NEW $ETRAP SET $ETRAP="GOTO TRAP1^KBANERR"
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location ERR2+1^KBANERR

GTM>ZST INTO
 WRITE 1/0
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location ERR2+3^KBANERR

GTM>ZST INTO
 NEW $ETRAP SET $ETRAP="HALT"  ; Emergency Error Trap
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location TRAP1+1^KBANERR

GTM>W $STACK
2
GTM>ZST INTO
 DO DISP
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location TRAP1+2^KBANERR

GTM>ZST INTO
 WRITE "$STACK is ",$STACK,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+1^KBANERR

GTM>ZST INTO
$STACK is 3
 WRITE "$ECODE is ",$ECODE,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+2^KBANERR

GTM>ZST INTO
$ECODE is ,M9,Z150373210,
 WRITE "$ETRAP is ",$ETRAP,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+3^KBANERR

GTM>ZST INTO
$ETRAP is HALT
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+4^KBANERR

GTM>ZST INTO
 SET $ECODE="" ; Clear Error
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location TRAP1+3^KBANERR

GTM>ZST INTO
 GOTO CONT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location TRAP1+4^KBANERR

GTM>ZST INTO
 WRITE "I have been rescued",!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location CONT+1^KBANERR

GTM>ZST INTO
I have been rescued
 DO DISP
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location CONT+2^KBANERR

GTM>W $STACK
2
GTM>ZST INTO
 WRITE "$STACK is ",$STACK,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+1^KBANERR

GTM>ZST INTO
$STACK is 3
 WRITE "$ECODE is ",$ECODE,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+2^KBANERR

GTM>ZST INTO
$ECODE is
 WRITE "$ETRAP is ",$ETRAP,!
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+3^KBANERR

GTM>ZST INTO
$ETRAP is HALT
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location DISP+4^KBANERR

GTM>ZST INTO
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location CONT+3^KBANERR

GTM>W $STACK
2
GTM>ZST INTO
 QUIT
%GTM-I-BREAKZST, Break instruction encountered during ZSTEP action
                At M source location ERR+4^KBANERR

GTM>W $STACK
1
GTM>ZST INTO

GTM>W $STACK
0
GTM>ZED

GTM>; if you cause another error in the error trap

GTM>; TROLLBACK:$TLEVEL QUIT:$QUIT "" QUIT

GTM>; ; correction in the error level

GTM>;