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| author | Austin Clements <austin@google.com> | 2015-03-05 15:07:00 -0500 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2015-03-11 21:35:21 +0000 |
| commit | 9dfbcd8facae22e2be8bc527e1877b1e23812073 (patch) | |
| tree | e5c8d2c9bf218828bd1a55db0360d1b6d0845cba /src/debug/dwarf/buf.go | |
| parent | d533e3955db945072ab2dfcca1cab57099569260 (diff) | |
| download | go-9dfbcd8facae22e2be8bc527e1877b1e23812073.tar.xz | |
debug/dwarf: factor parsing of unit lengths
Many headers in DWARF sections have a "unit length" that can be either
4 bytes or 12 bytes and indicates both the length of the unit and
whether the unit is in 32-bit or 64-bit format.
Currently, we implement unit length parsing in four different places.
Add a "unitLength" method to buf that parses a unit length and use it
in these four places.
Change-Id: I7950b91caaa92aa5e19aa63debc8ae46178ecc4d
Reviewed-on: https://go-review.googlesource.com/7281
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/debug/dwarf/buf.go')
| -rw-r--r-- | src/debug/dwarf/buf.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/debug/dwarf/buf.go b/src/debug/dwarf/buf.go index 53c46eb4b8..2ade0bd76a 100644 --- a/src/debug/dwarf/buf.go +++ b/src/debug/dwarf/buf.go @@ -163,6 +163,17 @@ func (b *buf) addr() uint64 { return 0 } +func (b *buf) unitLength() (length Offset, dwarf64 bool) { + length = Offset(b.uint32()) + if length == 0xffffffff { + dwarf64 = true + length = Offset(b.uint64()) + } else if length >= 0xfffffff0 { + b.error("unit length has reserved value") + } + return +} + func (b *buf) error(s string) { if b.err == nil { b.data = nil |