[llvm-dev] Can't find symbol from llvm backend (original) (raw)
n3v3rm03 via llvm-dev llvm-dev at lists.llvm.org
Fri Jan 18 02:57:00 PST 2019
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Hi, I am new to llvm. I create a global variable called "test_llvm_var" in the front end function pass like this:
new GlobalVariable(*m, tmp->getType(), true,llvm::GlobalValue::ExternalLinkage, tmp, "test_llvm_var");
where tmp is a function.
Then I tried to access this global variable in the back end MachineFunctionPass like this:
MCContext& MCC = MF.getContext();
MCSymbol* MCS = MCC.lookupSymbol("test_llvm_var");
if (MCS == NULL) {
errs() << ">>> MCSymbol is null\n";
}
else {
MCS->dump();
}(MF is a MachineFunction).
However I always get MCS==NULL, there is no symbol called test_llvm_var in the backend.
Am I doing something wrong? What I would like to do is to modify the global variable's value from the backend pass.
Any help would be appreciated. Thank you! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190118/348aad8e/attachment.html>
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