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cmd/compile: bug fixes for DWARF location lists

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Fix two small but serious bugs in the DWARF location list code that
should have been caught by the automated tests I didn't write.

After emitting debug information for a user variable, mark it as done
so that it doesn't get emitted again. Otherwise it would be written once
per slot it was decomposed into.

Correct a merge error in CL 44350: the location list abbreviations need
to have DW_AT_decl_line too, otherwise the resulting DWARF is gibberish.

Change-Id: I6ab4b8b32b7870981dac80eadf0ebfc4015ccb01
Reviewed-on: https://go-review.googlesource.com/59070
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Heschi Kreinick 2017-08-25 12:27:15 -04:00
parent dc42ffff59
commit 38bd725bf1
2 changed files with 4 additions and 0 deletions
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2
src/cmd/compile/internal/gc/pgen.go
View File

@ -453,6 +453,8 @@ func createComplexVars(fn *Node, debugInfo *ssa.FuncDebug) ([]*Node, []*dwarf.Va
if parts == nil { if parts == nil {
continue continue
} }
// Don't work on this variable again, no matter how many slots it has.
delete(varParts, n)
// Get the order the parts need to be in to represent the memory // Get the order the parts need to be in to represent the memory
// of the decomposed user variable. // of the decomposed user variable.

2
src/cmd/internal/dwarf/dwarf.go
View File

@ -328,6 +328,7 @@ var abbrevs = [DW_NABRV]dwAbbrev{
DW_CHILDREN_no, DW_CHILDREN_no,
[]dwAttrForm{ []dwAttrForm{
{DW_AT_name, DW_FORM_string}, {DW_AT_name, DW_FORM_string},
{DW_AT_decl_line, DW_FORM_udata},
{DW_AT_location, DW_FORM_sec_offset}, {DW_AT_location, DW_FORM_sec_offset},
{DW_AT_type, DW_FORM_ref_addr}, {DW_AT_type, DW_FORM_ref_addr},
}, },
@ -351,6 +352,7 @@ var abbrevs = [DW_NABRV]dwAbbrev{
DW_CHILDREN_no, DW_CHILDREN_no,
[]dwAttrForm{ []dwAttrForm{
{DW_AT_name, DW_FORM_string}, {DW_AT_name, DW_FORM_string},
{DW_AT_decl_line, DW_FORM_udata},
{DW_AT_location, DW_FORM_sec_offset}, {DW_AT_location, DW_FORM_sec_offset},
{DW_AT_type, DW_FORM_ref_addr}, {DW_AT_type, DW_FORM_ref_addr},
}, },