diff options
Diffstat (limited to 'src/cmd/link/internal/ld/dwarf.go')
| -rw-r--r-- | src/cmd/link/internal/ld/dwarf.go | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/cmd/link/internal/ld/dwarf.go b/src/cmd/link/internal/ld/dwarf.go index 9b11fdcff6..b6fb1bb5c1 100644 --- a/src/cmd/link/internal/ld/dwarf.go +++ b/src/cmd/link/internal/ld/dwarf.go @@ -1579,10 +1579,35 @@ func dwarfgeneratedebugsyms(ctxt *Link) { syms = writearanges(ctxt, syms) syms = writegdbscript(ctxt, syms) syms = append(syms, infosyms...) + syms = collectlocs(ctxt, syms, funcs) syms = writeranges(ctxt, syms) dwarfp = syms } +func collectlocs(ctxt *Link, syms []*Symbol, funcs []*Symbol) []*Symbol { + empty := true + for _, fn := range funcs { + for _, reloc := range fn.R { + if reloc.Type == objabi.R_DWARFREF && strings.HasPrefix(reloc.Sym.Name, dwarf.LocPrefix) { + reloc.Sym.Attr |= AttrReachable | AttrNotInSymbolTable + syms = append(syms, reloc.Sym) + empty = false + // One location list entry per function, but many relocations to it. Don't duplicate. + break + } + } + } + // Don't emit .debug_loc if it's empty -- it makes the ARM linker mad. + if !empty { + locsym := ctxt.Syms.Lookup(".debug_loc", 0) + locsym.R = locsym.R[:0] + locsym.Type = SDWARFLOC + locsym.Attr |= AttrReachable + syms = append(syms, locsym) + } + return syms +} + /* * Elf. */ @@ -1595,6 +1620,7 @@ func dwarfaddshstrings(ctxt *Link, shstrtab *Symbol) { Addstring(shstrtab, ".debug_aranges") Addstring(shstrtab, ".debug_frame") Addstring(shstrtab, ".debug_info") + Addstring(shstrtab, ".debug_loc") Addstring(shstrtab, ".debug_line") Addstring(shstrtab, ".debug_pubnames") Addstring(shstrtab, ".debug_pubtypes") @@ -1602,6 +1628,7 @@ func dwarfaddshstrings(ctxt *Link, shstrtab *Symbol) { Addstring(shstrtab, ".debug_ranges") if Linkmode == LinkExternal { Addstring(shstrtab, elfRelType+".debug_info") + Addstring(shstrtab, elfRelType+".debug_loc") Addstring(shstrtab, elfRelType+".debug_aranges") Addstring(shstrtab, elfRelType+".debug_line") Addstring(shstrtab, elfRelType+".debug_frame") @@ -1628,6 +1655,10 @@ func dwarfaddelfsectionsyms(ctxt *Link) { putelfsectionsym(sym, sym.Sect.Elfsect.shnum) sym = ctxt.Syms.Lookup(".debug_frame", 0) putelfsectionsym(sym, sym.Sect.Elfsect.shnum) + sym = ctxt.Syms.Lookup(".debug_loc", 0) + if sym.Sect != nil { + putelfsectionsym(sym, sym.Sect.Elfsect.shnum) + } sym = ctxt.Syms.Lookup(".debug_ranges", 0) if sym.Sect != nil { putelfsectionsym(sym, sym.Sect.Elfsect.shnum) |