<div dir="ltr">Thank you for your reply. <div><br></div><div>I was able to create a function and append the call instructions to those functions-taking-arguments to it with IRBuilder. Then I added it to the global constructors and it worked! Thank you!</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 21, 2020 at 9:53 PM David Blaikie <<a href="mailto:dblaikie@gmail.com">dblaikie@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 21, 2020 at 6:16 PM Mohannad Ismail <<a href="mailto:imohannad@vt.edu" target="_blank">imohannad@vt.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi David,<div><br></div><div>Thank you for your fast reply. </div><div><br></div><div>That's a good idea. But the arguments I need are obtained from the IR, or in more accurately, from the static analysis I do on the IR. I can't get these arguments externally. Are you proposing I create the function within the pass? How do I do that?</div></div></blockquote><div><br>If it's necessary to create the pass you want to, yeah, you could introduce a function within the transformation pass. (I guess it'd have to be a module pass, if it adds a function - I'm not 100% sure on that). Same way you create an IR function at any point - I guess IRBuilder::createFunction or something like that.<br> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 21, 2020 at 8:40 PM David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">You probably need to create a function that takes no arguments - and have that function then create the arguments and call the functions-taking-arguments you want to run as global ctors. Add the outer no-argument-taking-function to the global ctors list.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 21, 2020 at 5:28 PM Mohannad Ismail via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><p style="margin-top:0px;margin-right:0px;margin-left:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)">I want to insert a function call that executes first. I figured the way to do this is to insert to the global constructors with appendToGlobalCtors() in this way:</p><pre style="margin-top:0px;padding:12px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:1.30769;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;font-size:13px;vertical-align:baseline;box-sizing:inherit;width:auto;max-height:600px;overflow:auto;border-radius:5px"><code style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;line-height:inherit;font-family:Consolas,Menlo,Monaco,"Lucida Console","Liberation Mono","DejaVu Sans Mono","Bitstream Vera Sans Mono","Courier New",monospace,sans-serif;vertical-align:baseline;box-sizing:inherit;background-color:transparent;white-space:inherit;border-radius:0px">LLVMContext &C = M.getContext();
Function* FInit = Function::Create(FunctionType::get(Type::getVoidTy(C), false), GlobalValue::ExternalLinkage, INITMEMORY, &M);
appendToGlobalCtors(M, FInit, 0);
</code></pre><p style="margin-top:0px;margin-right:0px;margin-left:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)">This works well if the function has no arguments. But what if the function I need to insert has arguments that I would like to specify? How do I create the function to insert into the global constructors? The function I have returns void. I already know how to use the IRBuilder to create a function call. But the builder takes the arguments in the builder.CreateCall(Func, FuncArgs). In general, I need to execute a bunch of function calls first when I am able to obtain their parameters in the program.</p><p style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)">Hope I was clear enough. Let me know if this needs more clarification. Thanks!</p><p style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)"><br></p><p style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)">Best regards,</p><p style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;line-height:inherit;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(36,39,41)">Mohannad Ismail</p></div>
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