[LLVMdev] [patch] New feature: debug info for function memory ranges (-jit-emit-debug-function-range)

[Yuri]

On 06/19/2010 14:14, Jeffrey Yasskin wrote:
> Have you found http://llvm.org/docs/DebuggingJITedCode.html? The JIT
> already has support for something like this for gdb's benefit

Yes, I saw it and tried it. -jit-emit-debug generates ELF image in 
memory with debug info.
Another option -jit-emit-debug-to-disk creates .o ELF files with debug 
info, one per function. If there are thousands of functions there will 
be thousands of files.

perftools can't use the first option, since it only collects stack 
address information during the run. And it would be very 
difficult/impractical to list all (thousands) of the resulting .o files 
into pprof's command line. Same with valgrind and very slow to load them 
since pprof runs addr2line per object file. This will take forever.

So option -jit-emit-debug-function-range is meant to amend the above 
two. It creates just one file with information just sufficient for 
perftools.

Yuri