llvm dev - Jan 2014 - [LLVMdev] [llmdev] fail to process llvm generated assembly on windows/mingw32

Hello guys,

I'm using llvm 3.3 on windows with mingw (triple:
"i386-unknown-mingw32")
to compile IR code that my
program generates.

I do it in two phases: first I emit assembly code and then assemble it.

       TargetMachine targetMachine target.createTargetMachine(triple);

        targetMachine.setAsmVerbosityDefault(true);
        targetMachine.setFunctionSections(true);
        targetMachine.setDataSections(true);
        targetMachine.getOptions().setNoFramePointerElim(true);
        output.reset();
        targetMachine.emit(module, output,
CodeGenFileType.AssemblyFile);
        module.dispose();
        context.dispose();

        byte[] asm = output.toByteArray();
        output.reset();
        asm = output.toByteArray();

        BufferedOutputStream oOut = new BufferedOutputStream(new
FileOutputStream(oFile));

        targetMachine.assemble(asm, clazz.getClassName(), oOut);
        oOut.close();

(I use a java binding for llvm)

Unfortunately, the assemble call fails with the error:

org.robovm.llvm.LlvmException: java.io.PrintWriter:478:2: error:
unknown directive
        .section
.text$java_io_PrintWriter_checkError__Z_lookup,"xr"
        ^
java.io.PrintWriter:479:2: error: unknown directive
        .linkonce discard
        ^
java.io.PrintWriter:629:2: error: unknown directive
        .section
.text$java_io_PrintWriter_clearError__V_lookup,"xr"
        ^
java.io.PrintWriter:630:2: error: unknown directive
        .linkonce discard
        ^
java.io.PrintWriter:818:2: error: unknown directive
        .section
.text$java_io_PrintWriter_close__V_lookup,"xr"
        ^
java.io.PrintWriter:819:2: error: unknown directive
        .linkonce discard
        ^
java.io.PrintWriter:1008:2: error: unknown directive
        .section
.text$java_io_PrintWriter_flush__V_lookup,"xr"
        ^
java.io.PrintWriter:1009:2: error: unknown directive
        .linkonce discard
        ^
java.io.PrintWriter:1062:2: error: unknown directive
        .section
.text$java_io_PrintWriter_format__Ljava_lang_String$3B$5BLjava_lang_Object$3B__Ljava_io_PrintWriter$3B_lookup,"xr"
        ^
java.io.PrintWriter:1063:2: error: unknown directive
        .linkonce discard

Did you ever get that error?
The fact is I need to generate my code in two steps (emit
assembly and then assemble) because of some ASM processing that my program
later does (and that I commented out).
It is interesting to notice that if I generate the obj directly with
    targetMachine.emit(module, output, CodeGenFileType.ObjectFile);
the generation is OK.

(but then my program is unable to process the ASM, so that's not
good).

More info about my llvm configuration:

LLVM (http://llvm.org/):
  LLVM version 3.3
  Optimized build with assertions.
  Built Aug  4 2013 (14:50:50).
  Default target: i686-w64-mingw32
  Host CPU: corei7-avx

  Registered Targets:
    aarch64  - AArch64
    arm      - ARM
    cpp      - C++ backend
    hexagon  - Hexagon
    mblaze   - MBlaze
    mips     - Mips
    mips64   - Mips64 [experimental]
    mips64el - Mips64el [experimental]
    mipsel   - Mipsel
    msp430   - MSP430 [experimental]
    nvptx    - NVIDIA PTX 32-bit
    nvptx64  - NVIDIA PTX 64-bit
    ppc32    - PowerPC 32
    ppc64    - PowerPC 64
    sparc    - Sparc
    sparcv9  - Sparc V9
    systemz  - SystemZ
    thumb    - Thumb
    x86      - 32-bit X86: Pentium-Pro and above
    x86-64   - 64-bit X86: EM64T and AMD64
    xcore    - XCore

Any idea what may be wrong?

Carl.
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On 26 January 2014 09:27, Carl <name.is.carl at gmail.com>
wrote:
>
>
> Hello guys,
>
> I'm using llvm 3.3 on windows with mingw (triple:
"i386-unknown-mingw32") to
> compile IR code that my
> program generates.
>
> I do it in two phases: first I emit assembly code and then assemble it.
>
>        TargetMachine targetMachine > target.createTargetMachine(triple);
>
>         targetMachine.setAsmVerbosityDefault(true);
>         targetMachine.setFunctionSections(true);
>         targetMachine.setDataSections(true);
>         targetMachine.getOptions().setNoFramePointerElim(true);
>         output.reset();
>         targetMachine.emit(module, output,
> CodeGenFileType.AssemblyFile);
>         module.dispose();
>         context.dispose();
>
>         byte[] asm = output.toByteArray();
>         output.reset();
>         asm = output.toByteArray();
>
>         BufferedOutputStream oOut = new BufferedOutputStream(new
> FileOutputStream(oFile));
>
>         targetMachine.assemble(asm, clazz.getClassName(), oOut);
>         oOut.close();
>
> (I use a java binding for llvm)
>
> Unfortunately, the assemble call fails with the error:
>
> org.robovm.llvm.LlvmException: java.io.PrintWriter:478:2: error:
> unknown directive
>         .section
> .text$java_io_PrintWriter_checkError__Z_lookup,"xr"
>         ^
> java.io.PrintWriter:479:2: error: unknown directive
>         .linkonce discard
>         ^
The linkonce directive is coff only. Looks like the wrong asm parser
is being used.

Cheers,
Rafael

On Mon, Jan 27, 2014 at 6:08 AM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:
>
> The linkonce directive is coff only. Looks like the wrong asm parser
> is being used.
>
That issue is 3.3 and was fixed in 3.4.
At least that error disappeared when I moved onto the new version.
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