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[release-branch.go1.15] cmd/compile: do not emit an extra debug_line entry for the end of seq addr

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Uses DW_LNS_advance_pc directly, instead of calling putpclcdelta
because the latter will create a new debug_line entry for the end of
sequence address.

Updates #42484.
Fixes #42521.

Change-Id: Ib6355605cac101b9bf37a3b4961ab0cee678a839
Reviewed-on: https://go-review.googlesource.com/c/go/+/268937
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/269517
This commit is contained in:
Alessandro Arzilli 2020-11-12 14:58:46 +01:00 committed by Dmitri Shuralyov
parent 20f50bba49
commit 16ddb8bc76
1 changed files with 2 additions and 1 deletions
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3
src/cmd/internal/obj/dwarf.go
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@ -106,7 +106,8 @@ func (ctxt *Link) generateDebugLinesSymbol(s, lines *LSym) {
// GDB will assign a line number of zero the last row in the line
// table, which we don't want.
lastlen := uint64(s.Size - (lastpc - s.Func.Text.Pc))
putpclcdelta(ctxt, dctxt, lines, lastlen, 0)
dctxt.AddUint8(lines, dwarf.DW_LNS_advance_pc)
dwarf.Uleb128put(dctxt, lines, int64(lastlen))
dctxt.AddUint8(lines, 0) // start extended opcode
dwarf.Uleb128put(dctxt, lines, 1)
dctxt.AddUint8(lines, dwarf.DW_LNE_end_sequence)