Post by thread:Macro2

Hi Glenn, At 04:58 PM 12/12/98 +0100, you wrote: >When you use a MACRO somewhere in a routine. Does this use a level of the >STACK to save its return address or not ? > >Glenn > No, Macros are simply PREPROCESSOR DIRECTIVES. They are not executed by the pic at all. When the assembler assembles your code containing macros, it just replaces every instance of the macro by the actual text of the macro, it is just TEXTUAL SUBSTITUTION. After it does this, it then assembles the code. SO, a macro is fundamentally different from a subroutine. It doesn't save any memory, each time you "call" a macro, it is just the same as if you cut and paste the full macro text into that spot. MAcros are ONLY to make source code more readable. You must be careful when using macros since it can make it more difficult for you to immediately realize how long your code is. Sean +-------------------------------+ | Sean Breheny | | Amateur Radio Callsign: KA3YXM| | Electrical Engineering Student| +-------------------------------+ Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 spam_OUTshb7TakeThisOuTcornell.edu Phone(USA): (607) 253-0315 ICQ #: 3329174

NO, a macro is not to be confused with a called subroutine. when you assemble the code the macro will be expanded into the source code just as if you have typed the macro code into the source code. macro's are used so you don't have to type the same basic code many times. it also allows variables to be specified and substituted into the macro. michael You may leave the list at any time by writing "SIGNOFF PICLIST" in the body of a message to .....LISTSERVKILLspam@spam@MITVMA.MIT.EDU. -----Original Message----- From: Goovaerts <goofy1KILLspamGLO.BE> To: .....PICLISTKILLspam.....MITVMA.MIT.EDU <EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU> Date: Saturday, December 12, 1998 10:14 AM Subject: Macro2 >When you use a MACRO somewhere in a routine. Does this use a level of the >STACK to save its return address or not ? > >Glenn >

> When you use a MACRO somewhere in a routine. Does this use a level of the > STACK to save its return address or not ? > No. Stig ======================================================= Stig Brautaset - sbrautasspam_OUTc2i.net - ICQ:11052183 Student of electronics - http://home.c2i.net/sbrautas ======================================================= > Glenn >