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List: llvm-dev
Subject: [LLVMdev] Fw: Forcing the Interpreter segfaults
From: Török Edwin <edwintorok () gmail ! com>
Date: 2010-11-03 14:46:55
Message-ID: 20101103164655.1607e985 () deb0
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[I assume you meant to send this to the list as well, not just me.]
Begin forwarded message:
Date: Wed, 3 Nov 2010 14:43:54 +0000
From: Salomon Brys <salomon.brys@gmail.com>
To: Török Edwin <edwintorok@gmail.com>
Subject: Re: [LLVMdev] Forcing the Interpreter segfaults
I have build LLVM in debug mode. Here are the informations of the
segfault : memcpy() at 0x7ffff6f6581e
LoadIntFromMemory() at ExecutionEngine.cpp:887 0xb3c297
llvm::ExecutionEngine::LoadValueFromMemory() at ExecutionEngine.cpp:915
0xb3c3f9
llvm::Interpreter::visitLoadInst() at Execution.cpp:812 0xa1f855
llvm::InstVisitor<llvm::Interpreter, void>::visitLoad() at 0xa28357
llvm::InstVisitor<llvm::Interpreter, void>::visit() at 0xa26b4e
llvm::Interpreter::run() at Execution.cpp:1,328 0xa235ff
llvm::Interpreter::runFunction() at Interpreter.cpp:95 0xa166fa
....
So the segfaults happens because of the memcpy call in the
LoadIntFromMemory function in ExecutionEngine.cpp on line 887... Any
clue ?
Adding .setOptLevel(llvm::CodeGenOpt::None) to the EngineBuilder
creation reduces the time by 25% but that is still not enough :(
2010/11/3 Török Edwin <edwintorok@gmail.com>
> On Wed, 3 Nov 2010 11:18:34 +0000
> Salomon Brys <salomon.brys@gmail.com> wrote:
>
> > Jiting with no optimization does not reduce significantly the
> > compilation with very small code...
>
> I mean the parameter to createJIT, OptLevel. Try setting it to None.
> Or if you use EngineBuilder, setOptLevel(CodeGenOpt::None).
>
> > What is the local register allocator ???
>
> -regalloc=fast, or -regalloc=local parameter to llc, or lli.
> I think there was a programatic way to choose register allocator, but
> I forgot how.
>
> Best regards,
> --Edwin
>
--
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[Attachment #3 (text/html)]
<font face="arial,helvetica,sans-serif">I have build LLVM in debug mode. Here are the \
informations of the segfault :</font><div><font \
face="arial,helvetica,sans-serif"><div><span class="Apple-tab-span" \
style="white-space:pre"> </span>memcpy() at 0x7ffff6f6581e<span \
class="Apple-tab-span" style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>LoadIntFromMemory() \
at ExecutionEngine.cpp:887 0xb3c297<span class="Apple-tab-span" \
style="white-space:pre"> </span></div><div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::ExecutionEngine::LoadValueFromMemory() at \
ExecutionEngine.cpp:915 0xb3c3f9<span class="Apple-tab-span" \
style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::Interpreter::visitLoadInst() at \
Execution.cpp:812 0xa1f855<span class="Apple-tab-span" \
style="white-space:pre"> </span></div><div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::InstVisitor<llvm::Interpreter, \
void>::visitLoad() at 0xa28357<span class="Apple-tab-span" \
style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::InstVisitor<llvm::Interpreter, \
void>::visit() at 0xa26b4e<span class="Apple-tab-span" \
style="white-space:pre"> </span></div><div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::Interpreter::run() at Execution.cpp:1,328 \
0xa235ff<span class="Apple-tab-span" style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" \
style="white-space:pre"> </span>llvm::Interpreter::runFunction() at \
Interpreter.cpp:95 0xa166fa<span class="Apple-tab-span" \
style="white-space:pre"> </span></div><div><meta http-equiv="content-type" \
content="text/html; charset=utf-8"><span class="Apple-tab-span" style="white-space: \
pre; "> </span>....</div>
<div>So the segfaults happens because of the memcpy call in the LoadIntFromMemory \
function in ExecutionEngine.cpp on line 887... Any clue \
?</div><div><br></div><div><br></div><div>Adding .setOptLevel(llvm::CodeGenOpt::None) \
to the EngineBuilder creation reduces the time by 25% but that is still not enough \
:(</div>
<div><br></div></font><meta http-equiv="content-type" content="text/html; \
charset=utf-8"><meta http-equiv="content-type" content="text/html; \
charset=utf-8"><meta http-equiv="content-type" content="text/html; \
charset=utf-8"><br>
<div class="gmail_quote">2010/11/3 Török Edwin <span dir="ltr"><<a \
href="mailto:edwintorok@gmail.com">edwintorok@gmail.com</a>></span><br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex;">
On Wed, 3 Nov 2010 11:18:34 +0000<br>
<div class="im">Salomon Brys <<a \
href="mailto:salomon.brys@gmail.com">salomon.brys@gmail.com</a>> wrote:<br> <br>
</div><div class="im">> Jiting with no optimization does not reduce significantly \
the<br> > compilation with very small code...<br>
<br>
</div>I mean the parameter to createJIT, OptLevel. Try setting it to None.<br>
Or if you use EngineBuilder, setOptLevel(CodeGenOpt::None).<br>
<div class="im"><br>
> What is the local register allocator ???<br>
<br>
</div>-regalloc=fast, or -regalloc=local parameter to llc, or lli.<br>
I think there was a programatic way to choose register allocator, but I<br>
forgot how.<br>
<br>
Best regards,<br>
<font color="#888888">--Edwin<br>
</font></blockquote></div><br><br clear="all"><br>-- \
<br>###########################################<br># Salomon BRYS<br># +33 (0) 6 83 \
54 55 96<br>#------------------------------------------<br># > EPITECH \
"Koala" : C++ assistant : Sbire du C++<br>
# > Zend Certified Engineer for \
PHP5<br>#------------------------------------------<br># All data in this e-mail is \
confidential.<br># If you are not, or if you don't believe you are, the recipient \
of this e-mail, please delete it.<br>
#------------------------------------------<br># GPG : <a \
href="http://gpgkey-salomon.antesocial.fr/">http://gpgkey-salomon.antesocial.fr/</a><br>###########################################<br>
</div>
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