[LLVMdev] [LLVM, llvm-mc, AsmParser] Symbol locations.
STPWORLD at narod.ru
Thu Sep 8 15:35:25 CDT 2011
Now I see, that its to so trivial as I thought before. There are a lots of parser extensions that creates the symbols. And in each place we need insert add its location info. I also found that MCContext has several create symbols methods, but all these methods uses CreateSymbol private method.
So I see two possible ways here:
1. To aggregate all GetOrCreate-like symbol methods inside the AsmParser. So all asm parser extension like a COFFAsmParser should use aggregated methods instead of MCContext ones. And inside the aggregated methods we can add symbol location info.
2. Add create-symbol event to the MCContext. So each time when symbol will created by the MCContext::CreateSymbol this event will be fired. We can process this event by adding symbol location info to some AsmParser internal table for example.
08.09.2011, 15:23, "Stepan Dyatkovskiy" <STPWORLD at yandex.ru>:
> Hi everybody. I found that there are some problems with symbol location in AsmParser.
> 1. We need to know where symbol was declared.
> 2. We need to know where symbol was defined first time.
> There are two ways:
> 1. Add helper table to the parser with additional symbol info. But it takes additional memory consumption.
> 2. Add user tag (void*) for MCSymbol object. As I understood MCSymbol can live without asm sources, so we can't add info field directly. But the user tags is pretty common practice for this cases.
> So, what are you think about it?
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