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c The call stack is a list of routine names. Every time you call a routine,
c the name of that routine should be pushed onto the stack. When you exit,
c you should remove the name from the stack.
c This is useful for tracking down where errors occur, but it requires
c discipline since stack management is not automatic.
c The "stack" has two components: the array of strings ("invisible" to
c the rest of the code) and callstack_curr (from include/callstack.com).
c The reason is that in many routines, the overhead from calling push/pop
c would have a major impact on performance. Other times, it is completely
c negligible. You should try to use push/pop whenever possible and revert
c to setting callstack_curr manually when performance is critical. Using
c callstack_curr too deeply defeats the purpose of a stack, but it can
c be used as a tracer.
c Prototypes:
c subroutine callstack_init(szRoutine)
c subroutine callstack_push(szRoutine)
c subroutine callstack_print
c subroutine callstack_pop
c subroutine callstack_term
#define _CALLSTACK_LEN 32 /* max length of routine name */
#define _CALLSTACK_NUM 100 /* max depth of stack */
c#define _CALLSTACK_TRACE /* for verbose program tracing */
#ifdef _FAIL_TO_COMPILE_
c Copy this block to each routine:
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
#endif /* _FAIL_TO_COMPILE_ */
c ----------------------------------------------------------------------
blockdata callstack_bd
implicit none
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
data callstack /_CALLSTACK_NUM*' '/
data csn /0/
end
c ----------------------------------------------------------------------
subroutine callstack_init(szRoutine)
implicit none
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
character*(*) szRoutine
integer i
callstack_curr = szRoutine
callstack(1) = szRoutine
do i = 2, _CALLSTACK_NUM
callstack(i) = ' '
end do
csn = 1
#ifdef _CALLSTACK_TRACE
write(*,*) '@CALLSTACK_INIT: initialized callstack for ',szRoutine
#endif
return
end
c ----------------------------------------------------------------------
subroutine callstack_push(szRoutine)
implicit none
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
character*(*) szRoutine
#ifdef _CALLSTACK_TRACE
write(*,*) '@CALLSTACK_PUSH: callstack(',csn+1,') = ',szRoutine
#endif
callstack_curr = szRoutine
csn = csn+1
if (csn.le._CALLSTACK_NUM) then
callstack(csn) = szRoutine
else
write(*,*) '@CALLSTACK_PUSH: stack length exceeded by ',
& szRoutine
end if
return
end
c ----------------------------------------------------------------------
subroutine callstack_print
implicit none
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
integer i, j
write(*,*) '@CALLSTACK: ',callstack_curr
j = csn
if (callstack(csn).eq.callstack_curr) j = csn-1
do i = j, 1, -1
write(*,*) ' called by: ',callstack(i)
end do
return
end
c ----------------------------------------------------------------------
subroutine callstack_pop
implicit none
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
if (csn.le.0) then
write(*,*) '@CALLSTACK_POP: callstack is empty.'
call c_exit(1)
end if
#ifdef _CALLSTACK_TRACE
if (csn.le._CALLSTACK_NUM) then
write(*,*) '@CALLSTACK_POP: popped ',callstack(csn)
else
write(*,*) '@CALLSTACK_POP: popping overflow level ',csn
end if
#endif
csn = csn-1
callstack_curr = 'UNKNOWN'
if (csn.le._CALLSTACK_NUM) callstack_curr = callstack(csn)
return
end
c ----------------------------------------------------------------------
subroutine callstack_term
implicit none
#undef _CALLSTACK_COM_
#include "callstack.com" /* for callstack_curr */
external callstack_bd
character*(_CALLSTACK_LEN) callstack(_CALLSTACK_NUM)
integer csn
common /callstack_com/ callstack, csn
save /callstack_com/
if (csn.gt.1) then
write(*,*) '@CALLSTACK_TERM: callstack is not empty.'
call callstack_print
call c_exit(1)
end if
#ifdef _CALLSTACK_TRACE
write(*,*) '@CALLSTACK_TERM: done with ',callstack(1)
#endif
callstack(1) = ' '
csn = 0
return
end
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