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<p class="MsoNormal">Suppose I have the following program:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ cat test.c<o:p></o:p></p>
<p class="MsoNormal">int a = 0;<o:p></o:p></p>
<p class="MsoNormal">int main() { a = 1; };<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then I compile and run it:<o:p></o:p></p>
<p class="MsoNormal">$ clang test.c<o:p></o:p></p>
<p class="MsoNormal">$ ./a.out<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then I print the contents of test.c again:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$ cat test.c<o:p></o:p></p>
<p class="MsoNormal">int a = 0;<o:p></o:p></p>
<p class="MsoNormal">int main() { a = 1; }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Why does it say “int a = 0;”? The program set it to 1, no?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As far as I can tell, this is equivalent to your question… except it’s less obvious because the “source code” is an LLVM IR module in memory.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Maybe you’re looking for ExecutionSession::lookup? The same way the tutorial computes the address of “main”, you can compute the runtime address of any other externally visible symbol.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">See also <a href="https://llvm.org/docs/ORCv2.html">https://llvm.org/docs/ORCv2.html</a> ,
<a href="https://www.youtube.com/watch?v=hILdR8XRvdQ">https://www.youtube.com/watch?v=hILdR8XRvdQ</a> .<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Eli<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> <b>On Behalf Of
</b>Emma Luciano via llvm-dev<br>
<b>Sent:</b> Wednesday, June 3, 2020 1:35 AM<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> [EXT] [llvm-dev] Fwd: I cannot change value of global variable in LLVM IR using IRBuilder<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">Hi Everyone,<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">I'm quite new to LLVM and I want to update value of global variable in LLVM IR. I created new global variable in ModulePass:<o:p></o:p></span></p>
<pre style="vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit;max-height:600px;border-radius:3px;overflow:auto"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">bool runOnModule(llvm::</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Module</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> &M) {<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">IRBuilder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"><> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(M.getContext());<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Instruction</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> *I = &*inst_begin(M.getFunction("main"));<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">SetInsertPoint</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(I);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> M.getOrInsertGlobal("globalKey", </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.getInt64Ty());<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">GlobalVariable</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">* gVar = M.getNamedGlobal("globalKey");<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> gVar->setLinkage(</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">GlobalValue</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">::</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">InternalLinkage</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> gVar->setAlignment(</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Align</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(8));<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> gVar->setInitializer(</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.getInt64(0));<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> gVar->setConstant(false);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"><o:p> </o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> for (</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Function</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> &F : M.functions()) {<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">InstructionVisitor</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> visitor(DL, getAnalysis<</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">TargetLibraryInfoWrapperPass</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">>().getTLI(F));<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> for (</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Instruction</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> &I : instructions(F)) {<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> visitor.visit(I);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> }<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> }<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> return true;<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">}</span></code><span style="font-family:Consolas;color:#242729"><o:p></o:p></span></pre>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">Later in InstructionVisitor I try to update it like that:<o:p></o:p></span></p>
<pre style="vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit;max-height:600px;border-radius:3px;overflow:auto"><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">IRBuilder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"><> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(I->getContext());<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">SetInsertPoint</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(I->getNextNode());<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"><o:p> </o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">GlobalVariable</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">* key = I->getModule()->getNamedGlobal("globalKey");<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"><o:p> </o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">if (key) {<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">LoadInst</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">* load = </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">CreateLoad</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(key);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Value</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">* inc = </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">CreateAdd</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(load, </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.getInt64(1));<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">StoreInst</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">* store = </span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">Builder</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">.</span></code><code><span style="font-family:"inherit",serif;color:#2B91AF;border:none windowtext 1.0pt;padding:0in">CreateStore</span></code><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">(inc, key);<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in">}</span></code><span style="font-family:Consolas;color:#242729"><o:p></o:p></span></pre>
<p style="margin:0in;margin-bottom:.0001pt;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">I print that global variable during execution of instrumented code. I access it's value by key->getOperand(0), but it's unchanged. I'm using ORC JIT based on this tutorial: <a href="https://llvm.org/docs/tutorial/BuildingAJIT2.html" target="_blank"><span style="font-family:"inherit",serif;border:none windowtext 1.0pt;padding:0in">https://llvm.org/docs/tutorial/BuildingAJIT2.html</span></a> and
I run ModulePass from optimizeModule function from this tutorial.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">In IR it looks like that:<o:p></o:p></span></p>
<pre style="vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit;max-height:600px;border-radius:3px;overflow:auto"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> %2 = load i64, i64* @globalKey<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> %3 = add i64 %2, 1<o:p></o:p></span></code></pre>
<pre style="vertical-align:baseline"><code><span style="font-family:"inherit",serif;color:#242729;border:none windowtext 1.0pt;padding:0in"> store i64 %3, i64* @globalKey</span></code><span style="font-family:Consolas;color:#242729"><o:p></o:p></span></pre>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">I tried updating value of global variable, which was present in source code that I'm instrumenting. It didn't work either.<o:p></o:p></span></p>
<p style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;vertical-align:baseline;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;box-sizing:inherit">
<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">I created corresponding stackoverflow topic: <a href="https://stackoverflow.com/questions/62142574/how-can-i-update-global-variable-value-in-llvm-ir-using-irbuilder?fbclid=IwAR2X7uGhUjm_SN2UcxWYqaRQW2-cs6iPbMx2_tbKubeyYUkZ_pS6rkFfY9I" target="_blank"><span style="font-size:12.0pt">https://stackoverflow.com/questions/62142574/how-can-i-update-global-variable-value-in-llvm-ir-using-irbuilder?fbclid=IwAR2X7uGhUjm_SN2UcxWYqaRQW2-cs6iPbMx2_tbKubeyYUkZ_pS6rkFfY9I</span></a><o:p></o:p></span></p>
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<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">I will be really grateful for help.<o:p></o:p></span></p>
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<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">Regards,<o:p></o:p></span></p>
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<span style="font-size:11.5pt;font-family:"Arial",sans-serif;color:#242729">Emma Luciano<o:p></o:p></span></p>
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