[LLVMdev] Moving Private Label Prefixes from MCAsmInfo to MCObjectFileInfo

[Daniel Sanders]

Hi,

I've been having trouble properly resolving an issue with our assembly syntax. The prefix our assembler uses for private local/global labels depends on the object file format. For ELF32 they begin with '$' and for ELF64 they begin with '.L'. The object file format depends on the ABI, but multiple ABI's are usable with the same target triple so we can't select between the prefixes using triples. In the current structure, we appear to need MCAsmInfo to return different values for different object formats but it has no means to do this.

It seems to me that the private label prefixes are more closely associated with the object file format than they are with the assembly syntax so I'd like to propose moving
MCAsmInfo::getPrivateGlobalPrefix(), MCAsmInfo::getPrivateLabelPrefix(), and MCAsmInfo::getLinkerPrivateGlobalPrefix() to MCObjectFileInfo and its subclasses. This fixes the Mips case and should have no noticeable impact on other targets. ARM will need some new MCObjectFileInfo classes to handle COFF but other than that, the change seems fairly simple.

Does anyone agree/disagree with this change? Have I missed anything?

Daniel Sanders
Leading Software Design Engineer, MIPS Processor IP
Imagination Technologies Limited
www.imgtec.com<http://www.imgtec.com/>

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