* How to check the source code of stdarg?
@ 2011-11-02 13:37 Parmenides
2011-11-02 18:16 ` Ian Lance Taylor
0 siblings, 1 reply; 2+ messages in thread
From: Parmenides @ 2011-11-02 13:37 UTC (permalink / raw)
To: Gcc mailing list
Hi,
The gcc implements the stdarg.h to support variable parameters
functions. I wonder how it work. So, I find the stdarg.h at
/usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/stdarg.h
Open it , I found some definitions as follows:
#define va_start(v,l) __builtin_va_start(v,l)
#define va_end(v) __builtin_va_end(v)
#define va_arg(v,l) __builtin_va_arg(v,l)
Every macro has its __builtin_... version. I try to look for these
'__builtin_...' in gcc source code, but has not found. So, I want to
know how to check their source code.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to check the source code of stdarg?
2011-11-02 13:37 How to check the source code of stdarg? Parmenides
@ 2011-11-02 18:16 ` Ian Lance Taylor
0 siblings, 0 replies; 2+ messages in thread
From: Ian Lance Taylor @ 2011-11-02 18:16 UTC (permalink / raw)
To: Parmenides; +Cc: Gcc mailing list
Parmenides <mobile.parmenides@gmail.com> writes:
> The gcc implements the stdarg.h to support variable parameters
> functions. I wonder how it work. So, I find the stdarg.h at
>
>
> /usr/lib/gcc/i486-pc-linux-gnu/4.1.2/include/stdarg.h
>
> Open it , I found some definitions as follows:
>
> #define va_start(v,l) __builtin_va_start(v,l)
> #define va_end(v) __builtin_va_end(v)
> #define va_arg(v,l) __builtin_va_arg(v,l)
>
> Every macro has its __builtin_... version. I try to look for these
> '__builtin_...' in gcc source code, but has not found. So, I want to
> know how to check their source code.
For va_start and va_end, see gcc/builtins.c. Look for BUILT_IN_VA_START
and BUILT_IN_VA_END. For va_arg, look in c-*.[ch] and c-family/* and
cp/* for RID_VA_ARG.
Ian
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-11-02 13:37 How to check the source code of stdarg? Parmenides
2011-11-02 18:16 ` Ian Lance Taylor
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