[Dwarf-discuss] dwarf information for mutiple statements at thesame line.

[Michael Eager]

Keith Walker wrote:
>  
> 
>     I have a question about how dwarf deals with multiple statements at
>     one line. For example, suppose there is code
> 
>     f1(); f2(); 
> 
> One sort of related question that I have here is what line/column 
> numbers should the compiler generate when multiple statements 
> are created by macros.
>  
> Suppose that we have a macro:
>  
>     #define    MY_CODE    f1(); f2();
>  
> and then some code that uses the macro:  
>  
>     MY_CODE
>  
> Now I can see that the line number could be that in which the use of 
> MY_CODE occurs.    However it isn't obvious to me what the column 
> information (if any) should be in this case.    Any suggestions?
>  
> Keith

The source/column information should be for the line which contains
the macro invocation.  If the invocation is in column 1, as in your
example, that's the value to use.  Many compilers do not generate
any column info.

While macros may expand into additional statements, these are not
present in the source.  (They may only be represented as sequences
of tokens and never have even a transient textual existence.)


-- 
Michael Eager	 eager at eagercon.com
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