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cmd/compile: add new symbol for debug line numbers

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This is broken out from: CL 187117

This new symbol will be populated by the compiler and contain debug line
information that's currently generated in the linker. One might say it's
sad to create a new symbol, but this symbol will replace the isStmt
symbols.

Testing: Ran go build -toolexec 'toolstash -cmp'

Change-Id: If8f7ae4b43b7247076605b6429b7d03a1fd239c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/188238
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Jeremy Faller 2019-07-30 17:48:11 -04:00
parent f4ca3c1e0a
commit 376fc48338
7 changed files with 22 additions and 14 deletions
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8
src/cmd/internal/obj/objfile.go
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@ -537,7 +537,7 @@ func isDwarf64(ctxt *Link) bool {
return ctxt.Headtype == objabi.Haix
}
func (ctxt *Link) dwarfSym(s *LSym) (dwarfInfoSym, dwarfLocSym, dwarfRangesSym, dwarfAbsFnSym, dwarfIsStmtSym *LSym) {
func (ctxt *Link) dwarfSym(s *LSym) (dwarfInfoSym, dwarfLocSym, dwarfRangesSym, dwarfAbsFnSym, dwarfIsStmtSym, dwarfDebugLines *LSym) {
if s.Type != objabi.STEXT {
ctxt.Diag("dwarfSym of non-TEXT %v", s)
}
@ -551,9 +551,9 @@ func (ctxt *Link) dwarfSym(s *LSym) (dwarfInfoSym, dwarfLocSym, dwarfRangesSym,
s.Func.dwarfAbsFnSym = ctxt.DwFixups.AbsFuncDwarfSym(s)
}
s.Func.dwarfIsStmtSym = ctxt.LookupDerived(s, dwarf.IsStmtPrefix+s.Name)
s.Func.dwarfDebugLinesSym = ctxt.LookupDerived(s, dwarf.DebugLinesPrefix+s.Name)
}
return s.Func.dwarfInfoSym, s.Func.dwarfLocSym, s.Func.dwarfRangesSym, s.Func.dwarfAbsFnSym, s.Func.dwarfIsStmtSym
return s.Func.dwarfInfoSym, s.Func.dwarfLocSym, s.Func.dwarfRangesSym, s.Func.dwarfAbsFnSym, s.Func.dwarfIsStmtSym, s.Func.dwarfDebugLinesSym
}
func (s *LSym) Len() int64 {
@ -577,7 +577,7 @@ func (ctxt *Link) fileSymbol(fn *LSym) *LSym {
// TEXT symbol 's'. The various DWARF symbols must already have been
// initialized in InitTextSym.
func (ctxt *Link) populateDWARF(curfn interface{}, s *LSym, myimportpath string) {
info, loc, ranges, absfunc, _ := ctxt.dwarfSym(s)
info, loc, ranges, absfunc, _, _ := ctxt.dwarfSym(s)
if info.Size != 0 {
ctxt.Diag("makeFuncDebugEntry double process %v", s)
}