How to get the line info about a function when outputing the funciton prolog?

[Jiang Alan]

   I am developing a new target for GCC. But my assember need the source 
line information about a function(its begin line and end line ) before the 
function body is outputted. 

  I think the proper place to output this information is the function 
prologue macro. But when this macro is called, I don't know how to get the 
source file line information about the function?

_________________________________________________________________
ÏíÓÃÊÀ½çÉÏ×î´óµÄµç×ÓÓʼþϵͳ¡ª MSN Hotmail¡£http://www.hotmail.com/cn