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Austin Clements 6044dd098d debug/dwarf: return ClassUnknown if attribute class cannot be determined
Currently, if the .debug_abbrev section of an ELF file contains
attributes that aren't known to the dwarf package and that have form
formSecOffset, the dwarf package will fail to open the DWARF data with
an error like "decoding dwarf section abbrev at offset 0x17: cannot
determine class of unknown attribute with formSecOffset". For the most
part, the class is implied by the form encoded in the abbrev section,
but formSecOffset can imply many different DWARF classes. Hence,
debug/dwarf disambiguates these using a table of known attributes.
However, it will reject the entire image if it encounters an attribute
it can't determine the class of. This is particularly unfortunate
because the caller may never even uses the offending attribute.

Fix this by introducing a ClassUnknown attribute class to use as a
fallback in these cases. This allows the dwarf package to load the
DWARF data and isolates the problem to just the affected attributes.

Fixes #12592.

Change-Id: I766227b136e9757f8b89c0b3ab8e9ddea899d94f
Reviewed-on: https://go-review.googlesource.com/14541
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: jcd . <jcd@golang.org>
2015-09-15 17:57:51 +00:00
api api: update go1.5.txt 2015-07-30 21:14:09 +00:00
doc doc: go1.6.txt: template.Funcs checks names 2015-09-15 16:12:59 +00:00
lib/time lib/time: update to IANA release 2015e. 2015-07-22 02:56:31 +00:00
misc runtime: unblock special glibc signals on each thread 2015-09-14 21:59:54 +00:00
src debug/dwarf: return ClassUnknown if attribute class cannot be determined 2015-09-15 17:57:51 +00:00
test cmd/compile: convert typecheck_stack to []*Node 2015-09-06 23:50:51 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore y.output 2015-06-10 00:28:52 +00:00
AUTHORS A+C: automated updates 2015-09-10 00:59:04 +00:00
CONTRIBUTING.md doc: suggest security@golang.org for reporting security issues 2015-06-26 09:53:36 +00:00
CONTRIBUTORS A+C: automated updates 2015-09-10 00:59:04 +00:00
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README.md doc: fix broken link in README 2015-02-19 05:50:57 +00:00
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