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debug/dwarf: add flag_present attribute encoding.

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ref: http://www.dwarfstd.org/doc/DWARF4.pdf

Update #4829

R=minux.ma, iant
CC=dave, golang-dev
https://golang.org/cl/7354043
This commit is contained in:
Robin Eklind 2013-02-20 00:58:31 +08:00 committed by Shenghou Ma
parent 937f91e1da
commit 7fdaec6c2f
2 changed files with 5 additions and 0 deletions
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1
src/pkg/debug/dwarf/const.go
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@ -207,6 +207,7 @@ const (
formRef8 format = 0x14 formRef8 format = 0x14
formRefUdata format = 0x15 formRefUdata format = 0x15
formIndirect format = 0x16 formIndirect format = 0x16
formFlagPresent format = 0x19
) )
// A Tag is the classification (the type) of an Entry. // A Tag is the classification (the type) of an Entry.

4
src/pkg/debug/dwarf/entry.go
View File

@ -185,6 +185,10 @@ func (b *buf) entry(atab abbrevTable, ubase Offset) *Entry {
// flag // flag
case formFlag: case formFlag:
val = b.uint8() == 1 val = b.uint8() == 1
case formFlagPresent:
// The attribute is implicitly indicated as present, and no value is
// encoded in the debugging information entry itself.
val = true
// reference to other entry // reference to other entry
case formRefAddr: case formRefAddr: