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cmd/compile: output DWARF lexical blocks for local variables

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Change compiler and linker to emit DWARF lexical blocks in debug_info.
Version of debug_info is updated from DWARF v.2 to DWARF v.3 since version 2
does not allow lexical blocks with discontinuous ranges.

Second attempt at https://go-review.googlesource.com/#/c/29591/

Remaining open problems:
- scope information is removed from inlined functions
- variables in debug_info do not have DW_AT_start_scope attributes so a
variable will shadow other variables with the same name as soon as its
containing scope begins, before its declaration.

Updates golang/go#12899, golang/go#6913

Change-Id: I0e260a45b564d14a87b88974eb16c5387cb410a5
Reviewed-on: https://go-review.googlesource.com/36879
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Alessandro Arzilli 2017-03-07 18:59:14 +01:00 • committed by Matthew Dempsky
parent 7165bcc6ba
commit c8b889cc48
21 changed files with 890 additions and 110 deletions
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2
src/cmd/internal/obj/data.go
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@ -114,7 +114,7 @@ func (s *LSym) WriteInt(ctxt *Link, off int64, siz int, i int64) {
// WriteAddr writes an address of size siz into s at offset off.
// rsym and roff specify the relocation for the address.
func (s *LSym) WriteAddr(ctxt *Link, off int64, siz int, rsym *LSym, roff int64) {
if siz != ctxt.Arch.PtrSize {
if siz != ctxt.Arch.PtrSize && siz != 4 {
ctxt.Diag("WriteAddr: bad address size %d in %s", siz, s.Name)
}
s.prepwrite(ctxt, off, siz)