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POCompile, Assemble and Disassemble Using the LLVM Tool Chain
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  1. POCompile, Assemble and Disassemble Using the LLVM Tool Chain
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    copied!<p>I'm trying to run the following <a href="http://llvm.org/docs/GettingStarted.html#examples" rel="noreferrer">example</a> to Compile, Assemble and Disassemble an small program using the LLVM tool chain.</p> <p>My intention is to learn how it works so in further tries I could do some performance test by changing and/or reordering the assmbly's instructions.</p> <p>To start with, I first get the bite code of a dummy program:</p> <pre><code> % llvm-gcc -O3 -emit-llvm hello.c -c -o hello.bc </code></pre> <p>Once I have the bite code, i try to use the llvm-dis utility to take a look at the LLVM assembly code and llc to compile the program back to native assembly using the LLC code generator (just for the shake of trying): </p> <pre><code> % llvm-dis &lt; hello.bc | less % llc hello.bc -o hello.s </code></pre> <p>But in both cases I get the following error:</p> <pre><code> llvm-dis: Invalid MODULE_CODE_GLOBALVAR record </code></pre> <p>Any ideas on how to solve this problem?</p> <p>I've googled and I haven't found a solution. I have also tried to use </p> <pre><code> otool -tV hello </code></pre> <p>But the output is not compatible with llvm. Instead of getting the following assembly format: </p> <pre><code>.section __TEXT,__text,regular,pure_instructions .globl _main .align 4, 0x90 _main: Leh_func_begin1: pushq %rbp Ltmp0: movq %rsp, %rbp Ltmp1: subq $16, %rsp Ltmp2: leaq L_.str(%rip), %rax </code></pre> <p>I get: </p> <pre><code>__TEXT,__text) section start: 0000000100000eb0 pushq $0x00 0000000100000eb2 movq %rsp,%rbp 0000000100000eb5 andq $0xf0,%rsp 0000000100000eb9 movq 0x08(%rbp),%rdi 0000000100000ebd leaq 0x10(%rbp),%rsi 0000000100000ec1 movl %edi,%edx 0000000100000ec3 addl $0x01,%edx </code></pre> <p>Which is not valid for me as I cat compile the latter assembly with for example:</p> <pre><code> % gcc hello.s -o hello.native </code></pre> <p>Thanks in advance.</p>
 

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