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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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24
src/cmd/compile/internal/gc/bimport.go
View file

@ -187,7 +187,7 @@ func Import(imp *types.Pkg, in *bufio.Reader) {
if f := p.funcList[i]; f != nil {
// function not yet imported - read body and set it
funchdr(f)
funchdr(f, src.NoPos)
body := p.stmtList()
if body == nil {
// Make sure empty body is not interpreted as
@ -198,7 +198,7 @@ func Import(imp *types.Pkg, in *bufio.Reader) {
body = []*Node{nod(OEMPTY, nil, nil)}
}
f.Func.Inl.Set(body)
funcbody(f)
funcbody(f, src.NoPos)
} else {
// function already imported - read body but discard declarations
dclcontext = PDISCARD // throw away any declarations
@ -1091,54 +1091,54 @@ func (p *importer) node() *Node {
return nodl(p.pos(), op, p.expr(), nil)
case OIF:
markdcl()
markdcl(src.NoPos)
n := nodl(p.pos(), OIF, nil, nil)
n.Ninit.Set(p.stmtList())
n.Left = p.expr()
n.Nbody.Set(p.stmtList())
n.Rlist.Set(p.stmtList())
popdcl()
popdcl(src.NoPos)
return n
case OFOR:
markdcl()
markdcl(src.NoPos)
n := nodl(p.pos(), OFOR, nil, nil)
n.Ninit.Set(p.stmtList())
n.Left, n.Right = p.exprsOrNil()
n.Nbody.Set(p.stmtList())
popdcl()
popdcl(src.NoPos)
return n
case ORANGE:
markdcl()
markdcl(src.NoPos)
n := nodl(p.pos(), ORANGE, nil, nil)
n.List.Set(p.stmtList())
n.Right = p.expr()
n.Nbody.Set(p.stmtList())
popdcl()
popdcl(src.NoPos)
return n
case OSELECT, OSWITCH:
markdcl()
markdcl(src.NoPos)
n := nodl(p.pos(), op, nil, nil)
n.Ninit.Set(p.stmtList())
n.Left, _ = p.exprsOrNil()
n.List.Set(p.stmtList())
popdcl()
popdcl(src.NoPos)
return n
// case OCASE, OXCASE:
// unreachable - mapped to OXCASE case below by exporter
case OXCASE:
markdcl()
markdcl(src.NoPos)
n := nodl(p.pos(), OXCASE, nil, nil)
n.Xoffset = int64(block)
n.List.Set(p.exprList())
// TODO(gri) eventually we must declare variables for type switch
// statements (type switch statements are not yet exported)
n.Nbody.Set(p.stmtList())
popdcl()
popdcl(src.NoPos)
return n
// case OFALL: