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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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7
src/cmd/compile/internal/gc/syntax.go
View file

@ -321,9 +321,10 @@ type Func struct {
Shortname *types.Sym
Enter Nodes // for example, allocate and initialize memory for escaping parameters
Exit Nodes
Cvars Nodes // closure params
Dcl []*Node // autodcl for this func/closure
Inldcl Nodes // copy of dcl for use in inlining
Cvars Nodes // closure params
Dcl []*Node // autodcl for this func/closure
Inldcl Nodes // copy of dcl for use in inlining
scopes src.Scopes // lexical scopes of the function
Closgen int
Outerfunc *Node // outer function (for closure)
FieldTrack map[*types.Sym]struct{}