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[dev.link] cmd/internal/obj: add dump of aux symbols for -S=2

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For compiler developers interested in seeing DWARF generation details,
this patch provides symbol "debug asm" dumps for DWARF aux symbols
when -S=2 is in effect.

Change-Id: I5a0b6b65ce7b708948cbbf23c6b0d279bd4f8d9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/223017
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Than McIntosh 2020-03-11 11:18:00 -04:00
parent 8634642f9a
commit c44af2d4a2
3 changed files with 81 additions and 23 deletions
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30
src/cmd/internal/obj/objfile2.go
View file

@ -18,9 +18,8 @@ import (
// Entry point of writing new object file.
func WriteObjFile2(ctxt *Link, b *bio.Writer, pkgpath string) {
if ctxt.Debugasm > 0 {
ctxt.traverseSyms(traverseDefs, ctxt.writeSymDebug)
}
debugAsmEmit(ctxt)
genFuncInfoSyms(ctxt)
@ -434,3 +433,28 @@ func genFuncInfoSyms(ctxt *Link) {
}
ctxt.defs = append(ctxt.defs, infosyms...)
}
// debugDumpAux is a dumper for selected aux symbols.
func writeAuxSymDebug(ctxt *Link, par *LSym, aux *LSym) {
// Most aux symbols (ex: funcdata) are not interesting--
// pick out just the DWARF ones for now.
if aux.Type != objabi.SDWARFLOC &&
aux.Type != objabi.SDWARFINFO &&
aux.Type != objabi.SDWARFLINES &&
aux.Type != objabi.SDWARFRANGE {
return
}
ctxt.writeSymDebugNamed(aux, "aux for "+par.Name)
}
func debugAsmEmit(ctxt *Link) {
if ctxt.Debugasm > 0 {
ctxt.traverseSyms(traverseDefs, ctxt.writeSymDebug)
if ctxt.Debugasm > 1 {
fn := func(par *LSym, aux *LSym) {
writeAuxSymDebug(ctxt, par, aux)
}
ctxt.traverseAuxSyms(fn)
}
}
}