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<p>Hi David!</p>
<p>Thanks for reaching out, the codegen part of the tutorial is
fine, but when I try to generate the object code file, it throws
segfault. Also please note that I'm using release build of llvm,
actually I don't know whether that is the root cause or not.</p>
<p>I also run through valgrind, it seems like a invalid read from
stack.</p>
<p><code><samp></samp></code><code><samp>Error Summary:<br>
</samp></code></p>
<p><code><samp>1 errors in context 1 of 1:<br>
==4153== Invalid read of size 1<br>
==4153== at 0x4AFEE0:
llvm::optional_detail::OptionalStorage<llvm::Reloc::Model,
true>::OptionalStorage(llvm::optional_detail::OptionalStorage<llvm::Reloc::Model,
true> const&) (in /home/preejackie/kld/toy)<br>
==4153== by 0x4B098D:
llvm::RegisterTargetMachine<llvm::X86TargetMachine>::Allocator(llvm::Target
const&, llvm::Triple const&, llvm::StringRef,
llvm::StringRef, llvm::TargetOptions const&,
llvm::Optional<llvm::Reloc::Model>,
llvm::Optional<llvm::CodeModel::Model>,
llvm::CodeGenOpt::Level, bool) (in /home/preejackie/kld/toy)<br>
==4153== by 0x46CE5B: createTargetMachine
(TargetRegistry.h:397)<br>
==4153== by 0x46CE5B: main (kjit.cpp:1337)<br>
==4153== Address 0x4 is not stack'd, malloc'd or (recently)
free'd<br>
</samp></code></p>
<p>Source compile command : clang++ -g -O3 kjit.cpp `llvm-config
--cxxflags --ldflags --system-libs --libs all` -o toy</p>
<p>Please, let me know that if you need some additional information
:)</p>
<p>Thanks a lot <br>
</p>
<div class="moz-cite-prefix">On 25/01/19 1:47 AM, David Blaikie
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAENS6Et3+wW=t=T6eXERiYxi92_ee0JoWU9_eFqmP05+W8_-zQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi there!<br>
<br>
Sorry to hear you're having trouble with the examples &
thanks for reaching out.<br>
<br>
I'm having some difficulty reproducing the failure mode you
described. From the code sample, it sounds like you're in
Chapter 8 and I just took a look at Chapter 8 in my debug build
and got this result:<br>
<br>
<div>$ ./bin/Kaleidoscope-Ch8 </div>
<div>ready> def average(x y) (x + y) * 0.5;</div>
<div>Read function definition:</div>
<div>define double @average(double %x, double %y) {</div>
<div>entry:</div>
<div> %y2 = alloca double</div>
<div> %x1 = alloca double</div>
<div> store double %x, double* %x1</div>
<div> store double %y, double* %y2</div>
<div> %x3 = load double, double* %x1</div>
<div> %y4 = load double, double* %y2</div>
<div> %addtmp = fadd double %x3, %y4</div>
<div> %multmp = fmul double %addtmp, 5.000000e-01</div>
<div> ret double %multmp</div>
<div>}</div>
<div><br>
<br>
Any ideas what you might be doing differently that I could do
to try to reproduce the failure you're seeing?</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jan 24, 2019 at 9:36
AM preejackie via llvm-dev <<a
href="mailto:llvm-dev@lists.llvm.org"
moz-do-not-send="true">llvm-dev@lists.llvm.org</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>Hi all :)</p>
<p>I'm new to llvm!<br>
</p>
<p>I'm going through the kaleidoscope : compiling llvm IR
to object code tutorial, code in the listings breaks and
causes a segmentation fault. After some investigation
through gdb, probably this constructor call, causing the
segfault.<br>
</p>
<p><code>Program received signal SIGSEGV, Segmentation
fault.</code><code><br>
</code><code>0x00000000004afee0 in
llvm::optional_detail::OptionalStorage<llvm::Reloc::Model,
true>::OptionalStorage(llvm::optional_detail::OptionalStorage<llvm::Reloc::Model,
true> const&) ()</code></p>
<p><code>Source code: </code><br>
</p>
<div style="color:#f8f8f2;background-color:#272822;font-family:'Droid Sans Mono','monospace',monospace,'Droid Sans Fallback';font-weight:normal;font-size:14px;line-height:19px;white-space:pre-wrap"><div><span style="color:#f8f8f2">TargetOptions opt;</span></div><div><font face="Courier New, Courier, monospace"><span style="color:#f8f8f2"> </span><span style="color:#66d9ef;font-style:italic">auto</span><span style="color:#f8f8f2"> RM </span><span style="color:#f92672">=</span><span style="color:#f8f8f2"> Optional</span><span style="color:#f92672"><</span><span style="color:#f8f8f2">Reloc::Model</span><span style="color:#f92672">></span><span style="color:#f8f8f2">();</span></font></div><div><span style="color:#f8f8f2"> </span><span style="color:#66d9ef;font-style:italic">auto</span><span style="color:#f8f8f2"> TheTargetMachine </span><span style="color:#f92672">=</span></div><div><span style="color:#f8f8f2"> Target-></span><span style="color:#a6e22e">createTargetMachine</span><span style="color:#f8f8f2">(TargetTriple, CPU, Features, opt, RM);</span></div></div>
<p>Whether this behavior is already notified and is there
any workaround available for it ? I would be great to
know the root cause for this behavior.<br>
</p>
<p>Of course, the kaleidoscope is friendly and good
introduction to llvm for beginners, thank you very much
for developing :) <br>
</p>
<p>Thanks for your kind help <br>
</p>
</div>
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</blockquote>
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