<div dir="ltr">Hi Björn,<div><br></div><div>Does the module containing your main function have a triple or data layout? There should be a couple of lines at the top of the module that look like:</div><br><blockquote class="gmail_quote" style="margin:0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;border-right-width:1px;border-right-color:rgb(204,204,204);border-right-style:solid;padding-left:1ex;padding-right:1ex"></blockquote><font face="monospace, monospace">target data layout = "..."<br>target triple = "..."</font><div><br></div><div>If these lines are missing (especially the data layout) then the problem might be name mangling: findSymbol is applying the default system specific mangling (which on Windows may include prefixes), but the module is being compiled without mangling.</div><div><br></div><div>Can you share the header for your module?</div><div>Could you also modify your JIT to print DL.getStringRepresentation() in the constructor and share this?</div><div><br></div><div>These should match.</div><div><br></div><div>Cheers,</div><div>Lang.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 21, 2017 at 12:50 PM, Will Dietz <span dir="ltr"><<a href="mailto:willdtz@gmail.com" target="_blank">willdtz@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hmm, I tried using your code (copy+pasted and then mass-dumped headers to fix includes), and it seems to work fine for me:<div><br></div><div><a href="https://gist.github.com/dtzWill/df84b64a73001532e3fcfe73a2cffbb9#file-test-log" target="_blank">https://gist.github.com/<wbr>dtzWill/<wbr>df84b64a73001532e3fcfe73a2cffb<wbr>b9#file-test-log</a><br></div><div><br></div><div>Do you get different results when using your LLVM? If not, can you identify the differences between your code and what I constructed from your snippets?</div><div><br></div><div>I noticed "PAUSE", are you on Windows? I'm not sure what the functionality/status of the JIT on Windows is, perhaps someone else can comment on that.</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>~Will</div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 21, 2017 at 1:03 AM, via cfe-dev <span dir="ltr"><<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">Hello Lang,</font>
<br>
<br><font size="2" face="sans-serif">the Code for my jit_main is a normal
printf-HelloWorld program. I opended the file with notepad and found the
following:</font>
<br>
<br>
<table width="100%" style="border-collapse:collapse">
<tbody><tr valign="top" height="8">
<td width="100%" style="border-style:solid solid solid solid;border-color:#000000;border-width:1px 1px 1px 1px;padding:0px 0px"><font size="2" face="sans-serif">;
Function Attrs: noinline norecurse uwtable</font>
<br><font size="2" face="sans-serif">define i32 @main() #0 {</font>
<br><font size="2" face="sans-serif">entry:</font>
<br><font size="2" face="sans-serif"> %retval = alloca i32, align 4</font>
<br><font size="2" face="sans-serif"> store i32 0, i32* %retval, align
4</font>
<br><font size="2" face="sans-serif"> %call = call i32 (i8*, ...) @printf(i8*
getelementptr inbounds ([35 x i8], [35 x i8]* @"\01??_C@_0CD@CMJEAMCD@Plansc<wbr>hbeckilein?5sagt?5Halloilein@"<wbr>,
i32 0, i32 0))</font>
<br><font size="2" face="sans-serif"> %call1 = call i32 @system(i8*
getelementptr inbounds ([6 x i8], [6 x i8]* @"\01??_C@_05DIAHPDGL@PAUSE?$A<wbr>A@",
i32 0, i32 0))</font>
<br><font size="2" face="sans-serif"> ret i32 0</font>
<br><font size="2" face="sans-serif">}</font></td></tr></tbody></table>
<br>
<br><font size="2" face="sans-serif">So... there is a main... Anyway! The
code for the main is this one:</font>
<br>
<table width="100%" style="border-collapse:collapse">
<tbody><tr valign="top" height="8">
<td width="100%" style="border-style:solid solid solid solid;border-color:#000000;border-width:1px 1px 1px 1px;padding:0px 0px"><font size="1" color="#808080" face="}">#include</font><font size="1" face="}">
</font><font size="1" color="#a11f12" face="}"><stdio.h></font>
<br><font size="1" color="#808080" face="}">#include</font><font size="1" face="}">
</font><font size="1" color="#a11f12" face="}"><stdlib.h></font>
<br>
<br><font size="1" color="blue" face="}">int</font><font size="1" face="}"> main()</font>
<br><font size="1" face="}">{</font>
<br><font size="1" face="}"> printf(</font><font size="1" color="#a11f12" face="}">"Planschbeckilein
sagt Halloilein!\n"</font><font size="1" face="}">);</font>
<br><span><font size="1" face="}"> system(</font><font size="1" color="#a11f12" face="}">"PAUSE"</font><font size="1" face="}">);</font>
<br>
<br><font size="1" face="}"> </font><font size="1" color="blue" face="}">return</font><font size="1" face="}">
0;</font>
<br><font size="1" face="}">}</font></span></td></tr></tbody></table>
<br>
<br><font size="2" face="sans-serif">Kind regards</font>
<br><font size="2" face="sans-serif">Björn</font>
<br>
<br>
<br>
<br><font size="1" color="#5f5f5f" face="sans-serif">From:
</font><font size="1" face="sans-serif">Lang Hames <<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>></font>
<br><font size="1" color="#5f5f5f" face="sans-serif">To:
</font><font size="1" face="sans-serif"><a href="mailto:bjoern.gaier@horiba.com" target="_blank">bjoern.gaier@horiba.com</a></font>
<br><font size="1" color="#5f5f5f" face="sans-serif">Cc:
</font><font size="1" face="sans-serif">Clang Dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>></font>
<br><font size="1" color="#5f5f5f" face="sans-serif">Date:
</font><font size="1" face="sans-serif">20.04.2017 22:54</font>
<br><font size="1" color="#5f5f5f" face="sans-serif">Subject:
</font><font size="1" face="sans-serif">Re: [cfe-dev]
JIT doens't resolve address</font>
<br>
<hr noshade><div class="m_909400261680230945HOEnZb"><div class="m_909400261680230945h5">
<br>
<br>
<br><font size="3">Hi Bjoern,</font>
<br>
<br><font size="3">Sorry - I just noticed that the address for your "main"
function has come back as '0'. In this case the answer is even simpler:
The JIT never found the function at all, and so definitely didn't have
any external symbols to resolve, so it never called the resolver.</font>
<br>
<br><font size="3">A failure to find main has three likely causes:</font>
<br>
<br><font size="3">(1) jit_main.ll does not define main,</font>
<br><font size="3">(2) jit_main.ll defines main with private/internal linkage
(the JIT can't see private/internal symbols in general)</font>
<br><font size="3">(3) jit_main.ll defines main with external linkage, but
a system mangling is applied (e.g. on MacOSX 'main' is mangled to '_main').
The mangler code in your findSymbol function *should* correct
for this, but this may fail if the default data layout for your TargetMachine
varies from the Module's DataLayout.</font>
<br>
<br><font size="3">Can you share the contents of your jit_main.ll Module?</font>
<br>
<br><font size="3">Cheers,</font>
<br><font size="3">Lang.</font>
<br><font size="3"> </font>
<br>
<br><font size="3">On Thu, Apr 20, 2017 at 1:35 PM, Lang Hames <</font><a href="mailto:lhames@gmail.com" target="_blank"><font size="3" color="blue"><u>lhames@gmail.com</u></font></a><font size="3">>
wrote:</font>
<br><font size="3">HI Bjoern,</font>
<br>
<br><font size="3">There are two kinds of symbol lookup in the JIT:</font>
<br>
<br><font size="3">(1) You want to find a symbol defined JIT'd code. This
is what "findSymbol" on the JIT class does.</font>
<br>
<br><font size="3">(2) The JIT wants to fix up a module that contains references
to symbols defined elsewhere (either in your program, or in other JIT'd
code). This is the SymbolResolver's job.</font>
<br>
<br><font size="3">So assuming your main function in main.ll is trivial,
e.g.</font>
<br>
<br><tt><font size="3">int main() {</font></tt>
<br><tt><font size="3"> return 0;</font></tt>
<br><tt><font size="3">}</font></tt>
<br>
<br><font size="3">then your findSymbol call will return the address of the
JIT'd main without ever needing to look anything up in the resolver.</font>
<br>
<br><font size="3">If, on the other hand, your main function contains an
external reference, e.g.</font>
<br>
<br><tt><font size="3">int main() {</font></tt>
<br><tt><font size="3"> printf("Hello, World!"); // Reference
to externally defined function printf.</font></tt>
<br><tt><font size="3"> return 0;</font></tt>
<br><tt><font size="3">}</font></tt>
<br>
<br><font size="3">Then you'll receive a call back on your resolver looking
for the address of printf.</font>
<br>
<br><font size="3">Hope this helps!</font>
<br>
<br><font size="3">Cheers,</font>
<br><font size="3">Lang.</font>
<br>
<br><font size="3">On Thu, Apr 20, 2017 at 6:43 AM, via cfe-dev <</font><a href="mailto:cfe-dev@lists.llvm.org" target="_blank"><font size="3" color="blue"><u>cfe-dev@lists.llvm.org</u></font></a><font size="3">>
wrote:</font>
<br><font size="2" face="sans-serif">Hello LLVM-World,</font><font size="3">
<br>
</font><font size="2" face="sans-serif"><br>
I was following the "Building a JIT in LLVM"-Tutorial and tried
to load a normal main. My code is the following:</font>
<table width="100%" style="border-collapse:collapse">
<tbody><tr valign="top" height="8">
<td width="100%" style="border-style:solid solid solid solid;border-color:#000000;border-width:1px 1px 1px 1px;padding:1px 1px"><font size="1" color="blue">class</font><font size="1">
</font><font size="1" color="#4181c0">Jitter</font><font size="3"> </font><font size="1"><br>
{</font><font size="3"> </font><font size="1" color="blue"><br>
private</font><font size="1">:</font><font size="3"> </font><font size="1"><br>
std::</font><font size="1" color="#4181c0">unique_ptr</font><font size="1"><</font><font size="1" color="#4181c0">TargetMachine</font><font size="1">>
TM;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="blue">const</font><font size="1"> </font><font size="1" color="#4181c0">DataLayout</font><font size="1">
DL;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#4181c0">ObjectLinkingLayer</font><font size="1"><>
ObjectLayer;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#4181c0">IRCompileLayer</font><font size="1"><</font><font size="1" color="blue">decltype</font><font size="1">(Object<wbr>Layer)>
CompileLayer;</font><font size="3"> <br>
</font><font size="1" color="blue"><br>
public</font><font size="1">:</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="blue">typedef</font><font size="1"> </font><font size="1" color="blue">decltype</font><font size="1">(CompileLayer)::</font><font size="1" color="#4181c0">Module<wbr>SetHandleT</font><font size="1">
</font><font size="1" color="#4181c0">ModuleHandle</font><font size="1">;</font><font size="3">
<br>
</font><font size="1"><br>
Jitter() : TM(</font><font size="1" color="#4181c0">EngineBuilder</font><font size="1">().selectTarge<wbr>t()),
DL(TM</font><font size="1" color="#008080">-></font><font size="1">createDataLayout()),</font><font size="3">
</font><font size="1"><br>
CompileLayer(ObjectLayer, </font><font size="1" color="#4181c0">SimpleCompiler</font><font size="1">(</font><font size="1" color="#008080">*</font><font size="1">TM))
<br>
{printf(</font><font size="1" color="#a11f12">"!"</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
llvm::sys::</font><font size="1" color="#4181c0">DynamicLibrary</font><font size="1">::Loa<wbr>dLibraryPermanently(</font><font size="1" color="blue">nullptr</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
}</font><font size="3"> <br>
</font><font size="1"><br>
</font><font size="1" color="#4181c0">TargetMachine</font><font size="1">
&getTargetMachine() { </font><font size="1" color="blue">return</font><font size="1">
</font><font size="1" color="#008080">*</font><font size="1">TM; }</font><font size="3">
<br>
</font><font size="1"><br>
</font><font size="1" color="#4181c0">ModuleHandle</font><font size="1">
addModule(std::</font><font size="1" color="#4181c0">unique_ptr</font><font size="1"><</font><font size="1" color="#4181c0">Modu<wbr>le</font><font size="1">>
&&</font><font size="1" color="#808080">M</font><font size="1">) {</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="#008000">// Build our symbol resolver:</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="#008000">// Lambda 1: Look back into the
JIT itself to find symbols that are part of</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#008000">//
the same "logical dylib".</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#008000">// Lambda 2: Search for external
symbols in the host process.</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="blue">auto</font><font size="1"> Resolver
= createLambdaResolver(</font><font size="3"> </font><font size="1"><br>
[&](</font><font size="1" color="blue">const</font><font size="1">
std::</font><font size="1" color="#4181c0">string</font><font size="1"> &</font><font size="1" color="#808080">Name</font><font size="1">)
<br>
{</font><font size="3"> </font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"FLUSH
:0\n"</font><font size="1">);</font><font size="3"> <br>
</font><font size="1"><br>
</font><font size="1" color="blue">if</font><font size="1">
(</font><font size="1" color="blue">auto</font><font size="1"> Sym = CompileLayer.findSymbol(</font><font size="1" color="#808080">Name</font><font size="1">,
</font><font size="1" color="blue">false</font><font size="1">))</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1">
Sym;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1">
</font><font size="1" color="#4181c0">JITSymbol</font><font size="1">(</font><font size="1" color="blue">nullptr</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
},</font><font size="3"> </font><font size="1"><br>
[](</font><font size="1" color="blue">const</font><font size="1">
std::</font><font size="1" color="#4181c0">string</font><font size="1"> &</font><font size="1" color="#808080">S</font><font size="1">)
<br>
{</font><font size="3"> </font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"PLUSH
:0\n"</font><font size="1">);</font><font size="3"> <br>
</font><font size="1"><br>
</font><font size="1" color="blue">if</font><font size="1">
(</font><font size="1" color="blue">auto</font><font size="1"> SymAddr =</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="#4181c0">RTDyldMemoryManager</font><font size="1">::getSymbol<wbr>AddressInProcess(</font><font size="1" color="#808080">S</font><font size="1">))</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1">
</font><font size="1" color="#4181c0">JITSymbol</font><font size="1">(SymAddr,
</font><font size="1" color="#4181c0">JITSymbolFlags</font><font size="1">::</font><font size="1" color="#37605e">Exported</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1">
</font><font size="1" color="#4181c0">JITSymbol</font><font size="1">(</font><font size="1" color="blue">nullptr</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
});</font><font size="3"> <br>
</font><font size="1"><br>
</font><font size="1" color="#008000">// Build a singleton module set
to hold our module.</font><font size="3"> </font><font size="1"><br>
std::</font><font size="1" color="#4181c0">vector</font><font size="1"><std::</font><font size="1" color="#4181c0">unique_ptr</font><font size="1"><</font><font size="1" color="#4181c0">Mo<wbr>dule</font><font size="1">>>
Ms;</font><font size="3"> </font><font size="1"><br>
Ms.push_back(std::move(</font><font size="1" color="#808080">M</font><font size="1">));</font><font size="3">
<br>
</font><font size="1"><br>
</font><font size="1" color="#008000">// Add the set to the JIT with
the resolver we created above and a newly</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#008000">// created SectionMemoryManager.</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1"> CompileLayer.addModuleSet(std:<wbr>:move(Ms),</font><font size="3">
</font><font size="1"><br>
make_unique<</font><font size="1" color="#4181c0">SectionMemoryMana<wbr>ger</font><font size="1">>(),</font><font size="3">
</font><font size="1"><br>
std::move(Resolver));</font><font size="3">
</font><font size="1"><br>
}</font><font size="3"> <br>
</font><font size="1" color="#4181c0"><br>
JITSymbol</font><font size="1"> findSymbol(</font><font size="1" color="blue">const</font><font size="1">
std::</font><font size="1" color="#4181c0">string</font><font size="1"> </font><font size="1" color="#808080">Name</font><font size="1">)
{</font><font size="3"> </font><font size="1"><br>
std::</font><font size="1" color="#4181c0">string</font><font size="1">
MangledName;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#4181c0">raw_string_ostream</font><font size="1">
MangledNameStream(MangledName)<wbr>;</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#4181c0">Mangler</font><font size="1">::getNameWithPrefix(Man<wbr>gledNameStream,
</font><font size="1" color="#808080">Name</font><font size="1">, DL);</font><font size="3">
</font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"Tzearch for: %s\n\n"</font><font size="1">,
MangledNameStream.str());</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1"> CompileLayer.findSymbol(Mangle<wbr>dNameStream.str(),
</font><font size="1" color="blue">false</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
}</font><font size="3"> <br>
</font><font size="1" color="blue"><br>
void</font><font size="1"> removeModule(</font><font size="1" color="#4181c0">ModuleHandle</font><font size="1">
</font><font size="1" color="#808080">H</font><font size="1">) {</font><font size="3">
</font><font size="1"><br>
CompileLayer.removeModuleSet(</font><font size="1" color="#808080">H</font><font size="1"><wbr>);</font><font size="3">
</font><font size="1"><br>
}</font><font size="3"> <br>
</font><font size="1"><br>
};</font></td></tr></tbody></table>
<br><font size="2" face="sans-serif"><br>
<br>
And calling from main with:<br>
</font>
<table width="100%" style="border-collapse:collapse">
<tbody><tr valign="top" height="8">
<td width="100%" style="border-style:solid solid solid solid;border-color:#000000;border-width:1px 1px 1px 1px;padding:1px 1px"><font size="1" color="blue">int</font><font size="1">
main()</font><font size="3"> </font><font size="1"><br>
{</font><font size="3"> </font><font size="1"><br>
llvm::InitializeNativeTarget()<wbr>;</font><font size="3">
</font><font size="1"><br>
llvm::InitializeNativeTargetAs<wbr>mPrinter();</font><font size="3">
</font><font size="1"><br>
llvm::InitializeNativeTargetAs<wbr>mParser();</font><font size="3">
<br>
</font><font size="1"><br>
llvm::</font><font size="1" color="#4181c0">LLVMContext</font><font size="1">
context;</font><font size="3"> </font><font size="1"><br>
llvm::</font><font size="1" color="#4181c0">SMDiagnostic</font><font size="1">
dia;</font><font size="3"> <br>
</font><font size="1"><br>
std::</font><font size="1" color="#4181c0">unique_ptr</font><font size="1"><llvm::</font><font size="1" color="#4181c0">Module</font><font size="1">>
M = llvm::parseIRFile(</font><font size="1" color="#a11f12">"./jit_main.<wbr>ll"</font><font size="1">,
dia, context);</font><font size="3"> </font><font size="1"><br>
</font><font size="1" color="#4181c0">Jitter</font><font size="1">
jit;</font><font size="3"> </font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"Wuff?"</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="#4181c0">Jitter</font><font size="1">::</font><font size="1" color="#4181c0">ModuleHandle</font><font size="1">
h = jit.addModule(std::move(M));</font><font size="3"> </font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"KNUFF!\n"</font><font size="1">);</font><font size="3">
<br>
</font><font size="1"><br>
printf(</font><font size="1" color="#a11f12">"Kuchen!
0x%p\n"</font><font size="1">, jit.findSymbol(</font><font size="1" color="#a11f12">"main"</font><font size="1">).getAddr<wbr>ess());</font><font size="3">
<br>
</font><font size="1"><br>
system(</font><font size="1" color="#a11f12">"PAUSE"</font><font size="1">);</font><font size="3">
</font><font size="1"><br>
</font><font size="1" color="blue">return</font><font size="1">
0;</font><font size="3"> </font><font size="1"><br>
}</font></td></tr></tbody></table>
<br><font size="2" face="sans-serif"><br>
The Code runs without a fail, but when the programm tries to resolve "main"
the address is 0. The strange thing: the printf "</font><font size="1" color="#a11f12">FLUSH
:0\n</font><font size="2" face="sans-serif">" and "</font><font size="1" color="#a11f12">PLUSH
:0\n</font><font size="2" face="sans-serif">" are never called, so did
the code never compiled? What I'm doing wrong?</font><font size="3"> <br>
</font><font size="2" face="sans-serif"><br>
Kind regards</font><font size="3"> </font><font size="2" face="sans-serif"><br>
Björn<br>
Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr.
DE 114 165 789<br>
Geschäftsführer: Hiroshi Kawamura, Dr Hiroshi Nakamura, Markus Bode, Heiko
Lampert, Takashi Nagano, Takeshi Fukushima.</font>
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<br><font size="2" face="sans-serif"><br>
Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr.
DE 114 165 789<br>
Geschäftsführer: Hiroshi Kawamura, Dr Hiroshi Nakamura, Markus Bode, Heiko
Lampert, Takashi Nagano, Takeshi Fukushima.</font></div></div><br>______________________________<wbr>_________________<br>
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</div></div></blockquote></div><br></div>