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


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?

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