[LLVMdev] llc debug info

[Duncan P. N. Exon Smith]

Then I suspect that code isn’t being executed.  Try running through
a debugger (like lldb or gdb), and step through the statements.

On Mar 17, 2014, at 12:04 AM, 徐偉哲 <daniel60602 at gmail.com> wrote:

> I got many debug info from your reply.
> But I'm still confused about that I pass 
> llc -march=arm -regalloc=greedy -debug-only=regalloc x.bc -o x.s >&dbg
> and I want to check the debug info in RegAllocGreedy.cpp :
> 469   DEBUG(dbgs() << PrintReg(PhysReg, TRI) << " is available at cost " << Cost
> I can't find any information about  ......is available at cost.
> How can I get all information in RegAllocGreedy.cpp?
> 
> 
> 2014-03-16 7:03 GMT+08:00 Duncan P. N. Exon Smith <dexonsmith at apple.com>:
> Because llvm/lib/CodeGen/RegAllocGreedy.cpp has this line:
> 
>     #define DEBUG_TYPE "regalloc"
> 
> You can also pass -debug-only=regalloc to only evaluate the DEBUG()
> statements in that file.  So you may want to similarly define:
> 
>     #define DEBUG_TYPE “mypass"
> 
> If your pass is called -mypass.
> 
> On 2014 Mar 12, at 11:12, Jim Grosbach <grosbach at apple.com> wrote:
> 
> > Have you tried passing -debug?
> >
> > On Mar 12, 2014, at 3:57 AM, 徐偉哲 <daniel60602 at gmail.com> wrote:
> >
> >> I can generate debug info using opt like this:
> >> opt < a.bc > /dev/null -mypass -debug
> >>
> >> But I don't know how to do it using llc.
> >> I check http://llvm.org/docs/CommandGuide/llc.html
> >> there are not any information about debug flags.
> >>
> >> Purpose
> >> EX:
> >> I want to print all the DEBUG(dbgs()......) in llvm/lib/CodeGen/RegAllocGreedy.cpp .
> >> What should I do?
> >>
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