llvm dev - Nov 2006 - [LLVMdev] Convert C++ to C. What is 0x0p+0 ?

Hi Napi,

On Mon, 2006-11-06 at 12:17 +0800, Mohd-Hanafiah Abdullah
wrote:
> On Sun, 2006-11-05 at 19:06 -0800, Reid Spencer wrote:
> ...
> > As for the __main function, its a gcc library call required by the
> > compiler for program startup.  The details vary but the call is
needed.
> > Amongst other things it will probably initialize your C++ static
> > constructors. 
> 
> Hi Reid:
> 
> I'm not using gcc for this purpose but another C compiler called AMPC.
> It compiles C code into Java Bytecode.  What I'm missing is the C++ to
> JVM portion which I'm trying to use LLVM for converting C++ to C then
> pass it through AMPC to get the Java Bytecode.
Okay, cool :)
> One question is does the resulting C code produced by llc will call C++
> functions/methods still? 
Yes.
>  It would be good if only C library functions
> are called since I already have the standard C library compiled by AMPC
> in the bytecode format.
If you use the stdc++ library in your source code then you'll need to
compile that with AMPC as well (after siphoning it through llvm).
> 
> Thanks.
You're welcome.

Reid.

On Sun, 2006-11-05 at 19:06 -0800, Reid Spencer wrote:
...
> As for the __main function, its a gcc library call required by the
> compiler for program startup.  The details vary but the call is needed.
> Amongst other things it will probably initialize your C++ static
> constructors. 
Hi Reid:

I'm not using gcc for this purpose but another C compiler called AMPC.
It compiles C code into Java Bytecode.  What I'm missing is the C++ to
JVM portion which I'm trying to use LLVM for converting C++ to C then
pass it through AMPC to get the Java Bytecode.

One question is does the resulting C code produced by llc will call C++
functions/methods still?  It would be good if only C library functions
are called since I already have the standard C library compiled by AMPC
in the bytecode format.

Thanks.

Napi

Hi Reid:

I hate to be a pain.  But when I ran the program helloworld.class
after compiling it with AMPC I got the following message:

Exception in thread "main" java.lang.NoClassDefFoundError:
_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
        at helloworld._Z4CONTv(Unknown Source)
        at helloworld.__main(Unknown Source)
        at helloworld._$C_main(Unknown Source)
        at helloworld._$pre_C_main(Unknown Source)
        at helloworld.main(Unknown Source)

The function _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc()
was generated by llc after translating it from the C++ statement
std::cout.

How do you suggest I handle this sort of things properly?
The appropriate files are attached.

Thanks.

Napi


On Sun, 2006-11-05 at 20:16 -0800, Reid Spencer wrote:
> Hi Napi,
> 
> On Mon, 2006-11-06 at 12:17 +0800, Mohd-Hanafiah Abdullah wrote:
> > On Sun, 2006-11-05 at 19:06 -0800, Reid Spencer wrote:
> > ...
> > > As for the __main function, its a gcc library call required by
the
> > > compiler for program startup.  The details vary but the call is
needed.
> > > Amongst other things it will probably initialize your C++ static
> > > constructors. 
> > 
> > Hi Reid:
> > 
> > I'm not using gcc for this purpose but another C compiler called
AMPC.
> > It compiles C code into Java Bytecode.  What I'm missing is the
C++ to
> > JVM portion which I'm trying to use LLVM for converting C++ to C
then
> > pass it through AMPC to get the Java Bytecode.
> 
> Okay, cool :)
> 
> > One question is does the resulting C code produced by llc will call
C++
> > functions/methods still? 
> 
> Yes.
> 
> >  It would be good if only C library functions
> > are called since I already have the standard C library compiled by
AMPC
> > in the bytecode format.
> 
> If you use the stdc++ library in your source code then you'll need to
> compile that with AMPC as well (after siphoning it through llvm).
> 
> > 
> > Thanks.
> 
> You're welcome.
> 
> Reid.
> 
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