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cmd/internal/dwarf: update to DWARF4, emit frame_base

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In preparation for CL 41770, upgrade .debug_info to DWARF4, and emit
DW_AT_frame_base on subprograms. This should make no semantic
difference.

Also fix a long-standing bug/inconsistency in puttattr: it didn't
add the addend to ref_addrs. Previously this didn't matter because it
was only used for types, but now it's used for section offsets into
symbols that have multiple entries.

RELNOTE=yes

Change-Id: Ib10654ac92edfa29c5167c44133648151d70cf76
Reviewed-on: https://go-review.googlesource.com/44210
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This commit is contained in:
Heschi Kreinick 2017-05-24 17:43:08 -04:00
parent 11ab865d6f
commit b74f01d76f
3 changed files with 16 additions and 9 deletions
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2
src/cmd/link/internal/ld/dwarf.go
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@ -1348,7 +1348,7 @@ func writeinfo(ctxt *Link, syms []*Symbol, funcs []*Symbol) []*Symbol {
// Fields marked with (*) must be changed for 64-bit dwarf
// This must match COMPUNITHEADERSIZE above.
Adduint32(ctxt, s, 0) // unit_length (*), will be filled in later.
Adduint16(ctxt, s, 3) // dwarf version (appendix F)
Adduint16(ctxt, s, 4) // dwarf version (appendix F)
// debug_abbrev_offset (*)
adddwarfref(ctxt, s, abbrevsym, 4)