llvm dev - Sep 2004 - [LLVMdev] How could I get memory address for each assemble instruction?

Hi all,

I am trying to disassemble *.bc to assemble code by using llvm-dis command, but
what I got is like the following. So how could I get the assemble code like
objdump? I mean the memory address for each instruction.

Thanks

Qiuyu


llvm-dis:
 .text
 .align 16
 .globl adpcm_coder
 .type adpcm_coder, @function
adpcm_coder:
.LBBadpcm_coder_0: # entry
 sub %ESP, 116
 mov DWORD PTR [%ESP + 12], %ESI
 mov %EAX, DWORD PTR [%ESP + 120]
 mov %ECX, DWORD PTR [%ESP + 124]
 mov %EDX, DWORD PTR [%ESP + 128]
 mov %ESI, DWORD PTR [%ESP + 132]
 mov DWORD PTR [%ESP], 0
 mov DWORD PTR [%ESP + 44], %EAX
 mov DWORD PTR [%ESP + 40], %ECX


objdump :
08048720 <adpcm_coder>:
 8048720: 83 ec 74              sub    $0x74,%esp
 8048723: 89 74 24 0c           mov    %esi,0xc(%esp,1)
 8048727: 8b 44 24 78           mov    0x78(%esp,1),%eax
 804872b: 8b 4c 24 7c           mov    0x7c(%esp,1),%ecx
 804872f: 8b 94 24 80 00 00 00  mov    0x80(%esp,1),%edx
 8048736: 8b b4 24 84 00 00 00  mov    0x84(%esp,1),%esi
 804873d: c7 04 24 00 00 00 00  movl   $0x0,(%esp,1)
 8048744: 89 44 24 2c           mov    %eax,0x2c(%esp,1)

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Zhang Qiuyu wrote:
>  
> Hi all,
>  
> I am trying to disassemble *.bc to assemble code by using llvm-dis 
> command, but what I got is like the following. So how could I get the 
> assemble code like objdump? I mean the memory address for each instruction.
>  
The LLVM disassembler (llvm-dis) generates a human readable list of LLVM
assembly instructions representing the bytecode instructions inside of
the .bc file.  LLVM instructions really don't have addresses, so there
is no equivalent functionality in llvm-dis.

If you want to generate machine code and then disassemble it to see the
native instructions, you can use llc on the bytecode to generate native
assembly language.  Then you can assemble and disassemble the native
code with gcc (really, as) and objdump, respectively.

For example,

llc -o file.s file.bc
gcc -o file.o file.s
objdump -d file.o

This would produce the list of native code instructions generated by
llc, including the addresses of the native code instructions.

Is this the sort of answer you're looking for?

-- John T.
> Thanks
>  
> Qiuyu
>  
>  
> llvm-dis:
>  .text
>  .align 16
>  .globl adpcm_coder
>  .type adpcm_coder, @function
> adpcm_coder:
> .LBBadpcm_coder_0: # entry
>  sub %ESP, 116
>  mov DWORD PTR [%ESP + 12], %ESI
>  mov %EAX, DWORD PTR [%ESP + 120]
>  mov %ECX, DWORD PTR [%ESP + 124]
>  mov %EDX, DWORD PTR [%ESP + 128]
>  mov %ESI, DWORD PTR [%ESP + 132]
>  mov DWORD PTR [%ESP], 0
>  mov DWORD PTR [%ESP + 44], %EAX
>  mov DWORD PTR [%ESP + 40], %ECX
>  
> objdump :
> 08048720 <adpcm_coder>:
>  8048720: 83 ec 74              sub    $0x74,%esp
>  8048723: 89 74 24 0c           mov    %esi,0xc(%esp,1)
>  8048727: 8b 44 24 78           mov    0x78(%esp,1),%eax
>  804872b: 8b 4c 24 7c           mov    0x7c(%esp,1),%ecx
>  804872f: 8b 94 24 80 00 00 00  mov    0x80(%esp,1),%edx
>  8048736: 8b b4 24 84 00 00 00  mov    0x84(%esp,1),%esi
>  804873d: c7 04 24 00 00 00 00  movl   $0x0,(%esp,1)
>  8048744: 89 44 24 2c           mov    %eax,0x2c(%esp,1)
> 
> 
> ------------------------------------------------------------------------
> 
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> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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-- 
*********************************************************************
* John T. Criswell                         Email: criswell at uiuc.edu *
* Research Programmer                                               *
* University of Illinois at Urbana-Champaign                        *
*                                                                   *
* "It's today!" said Piglet. "My favorite day," said
Pooh.          *
*********************************************************************

On Mon, 13 Sep 2004, Zhang Qiuyu wrote:
>
> Hi all,
>
> I am trying to disassemble *.bc to assemble code by using llvm-dis
> command, but what I got is like the following. So how could I get the
> assemble code like objdump? I mean the memory address for each
> instruction.
That looks like llc output, not llvm-dis output.  In any case, you should
be able to do something like this:

  llc x.bc -o x.s
  gcc x.s -o x
  objdump <whatever> x

-Chris
> llvm-dis:
>  .text
>  .align 16
>  .globl adpcm_coder
>  .type adpcm_coder, @function
> adpcm_coder:
> .LBBadpcm_coder_0: # entry
>  sub %ESP, 116
>  mov DWORD PTR [%ESP + 12], %ESI
>  mov %EAX, DWORD PTR [%ESP + 120]
>  mov %ECX, DWORD PTR [%ESP + 124]
>  mov %EDX, DWORD PTR [%ESP + 128]
>  mov %ESI, DWORD PTR [%ESP + 132]
>  mov DWORD PTR [%ESP], 0
>  mov DWORD PTR [%ESP + 44], %EAX
>  mov DWORD PTR [%ESP + 40], %ECX
>
>
> objdump :
> 08048720 <adpcm_coder>:
>  8048720: 83 ec 74              sub    $0x74,%esp
>  8048723: 89 74 24 0c           mov    %esi,0xc(%esp,1)
>  8048727: 8b 44 24 78           mov    0x78(%esp,1),%eax
>  804872b: 8b 4c 24 7c           mov    0x7c(%esp,1),%ecx
>  804872f: 8b 94 24 80 00 00 00  mov    0x80(%esp,1),%edx
>  8048736: 8b b4 24 84 00 00 00  mov    0x84(%esp,1),%esi
>  804873d: c7 04 24 00 00 00 00  movl   $0x0,(%esp,1)
>  8048744: 89 44 24 2c           mov    %eax,0x2c(%esp,1)
>
>
-Chris

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