[llvm-dev] Prevent Instruction Fixup from using relocations (original) (raw)
Zhang via llvm-dev llvm-dev at lists.llvm.org
Thu Mar 11 02:43:16 PST 2021
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Hi:
I'm trying to build a toy backend that produces code without relocation for my toy ELF loader. For now, my InstructionSelection works as intended and for MCInstLowering, I just lower MO_GlobalAddress operands with the following code:
MCOperand::createExpr(MCSymbolRefExpr::create(getSymbol(MO.getGlobal())))However the backend still tries to use relocation even when I've set RelocationModel to Reloc::Static. Further debugging shows that in MCAssembler::evaluateFixup, which in turn calls MCExpr::evaluateAsRelocatableImpl, the evaluation failed due to the MCSymbol is not variable.
That's where I'm lost with what does variable MCSymbol means, where does it come from and what should I do to fix it. Any help would be appreciated.
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