Reader.SeekPC() is useful. Thanks. The problem was due to my misunderstanding of how inlined functions are represented in the DWARF data.
I've solved it now. Thanks again. On Saturday, February 5, 2022 at 6:49:06 PM UTC Ian Lance Taylor wrote: > On Sat, Feb 5, 2022 at 1:45 AM stephen.t....@gmail.com > <stephen.t....@gmail.com> wrote: > > > > I'm trying to decode the DWARF data in an ELF binary and I'm not sure > how to handle functions. > > > > I'm using the elf/dwarf package in the Go standard library and > successfully using it to identify compile units and source files and also > to find line entries for an executed address. > > > > What I can't see is how to relate a dwarf.LineEntry to a function (or > SubProgram as it is called in DWARF terminology). > > > > If the SubProgram TAG has both Low PC and High PC attributes then I can > see how it can be done. Where it gets tricky is if a SubProgram has been > inlined. > > > > What I don't fully understand is how InlinedSubPrograms relate to > SubPrograms. > > > > I realise that this isn't really a Go question but I'm hoping someone > has used the Go standard library in this way and understands how to solve > this problem. > > The DWARF line number information maps PC values to a file name and a > line number. It sounds like you want to map a PC value to a function, > and you want to consider inlining information. To do that use > https://pkg.go.dev/debug/dwarf#Reader.SeekPC to get an Entry and look > for the AttrName or AttrLinkageName attribute. Note that, as the > documentation says, SeekPC is not efficient if you need to look up a > bunch of PC values. For that you'll want to loop through the entries, > call the Ranges method, and build a lookup table. > > Hope this helps. > > Ian > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/d583eb22-0d1a-4e0f-a581-3dbc02673fa2n%40googlegroups.com.
