Hello, This patch against svn r82147 "fixes" PR4776. Certain targets (e.g., MSP430) allow a symbol to start with a number, e.g. "0x0021"; you can say stuff like "mov.b &0x0021, r15" to copy a byte from memory address 0x0021 to register r15. LLVM had been generating this ill-formed code instead: mov.b &_30_x0021, r15 # note ASCII '0' has character code 0x30 Chris suggested that I add a bool for "symbols can start with digit" to MCAsmInfo and set it to true in the MSP430 backend, then make the mangler and MCSymbol printer respect that bool -- so that's what I did. Chris blessed the patch in the Bugzilla thread, but I wanted to solicit comments here because it's my first. (Is my approach reasonable? Would a more conservative strategy, e.g., just allowing symbols to start with "0x", suffice?) My own comments: there's a lot of code duplication between MCSymbol and Mangler; I'm not sure whether that's intentional or unavoidable. I also noticed words like "name" and "symbol" being used interchangeably and somewhat inconsistently; my patch simply follows the naming schemes apparent in each file I touched. -ben -------------- next part -------------- A non-text attachment was scrubbed... Name: pr4776-vs-r82147.patch Type: application/octet-stream Size: 5939 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20090917/b29c66ce/attachment.obj>
Looks great to me, please commit. On Sep 17, 2009, at 10:08 AM, Ben Ransford wrote:> Hello, > > This patch against svn r82147 "fixes" PR4776. Certain targets (e.g., > MSP430) allow a symbol to start with a number, e.g. "0x0021"; you can > say stuff like "mov.b &0x0021, r15" to copy a byte from memory address > 0x0021 to register r15. LLVM had been generating this ill-formed code > instead: > > mov.b &_30_x0021, r15 # note ASCII '0' has character code 0x30 > > Chris suggested that I add a bool for "symbols can start with digit" > to MCAsmInfo and set it to true in the MSP430 backend, then make the > mangler and MCSymbol printer respect that bool -- so that's what I > did. > > Chris blessed the patch in the Bugzilla thread, but I wanted to > solicit comments here because it's my first. (Is my approach > reasonable? Would a more conservative strategy, e.g., just allowing > symbols to start with "0x", suffice?) > > My own comments: there's a lot of code duplication between MCSymbol > and Mangler; I'm not sure whether that's intentional or unavoidable. > I also noticed words like "name" and "symbol" being used > interchangeably and somewhat inconsistently; my patch simply follows > the naming schemes apparent in each file I touched. > > -ben > <pr4776-vs- > r82147.patch>_______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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