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Commit Graph

13 Commits

Author SHA1 Message Date
Joe Tsai
897dcdb5ec debug/elf: deflake file_test.go
It is valid for io.Reader to return (n, io.EOF) where n is positive.
The unit test should not fail if io.EOF is returned when read until
the end.

Change-Id: I7b918e3cc03db8b90c8aa58f4c0f7806a1d4af7e
Reviewed-on: https://go-review.googlesource.com/21307
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-30 06:56:25 +00:00
Michael Munday
12fb62a57d debug/elf: add s390x relocations
Change-Id: I8440f69c7f99d65b2f69035c26b4a62104f22bd3
Reviewed-on: https://go-review.googlesource.com/20874
Reviewed-by: Minux Ma <minux@golang.org>
2016-03-29 16:48:09 +00:00
Brad Fitzpatrick
519474451a all: make copyright headers consistent with one space after period
This is a subset of https://golang.org/cl/20022 with only the copyright
header lines, so the next CL will be smaller and more reviewable.

Go policy has been single space after periods in comments for some time.

The copyright header template at:

    https://golang.org/doc/contribute.html#copyright

also uses a single space.

Make them all consistent.

Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0
Reviewed-on: https://go-review.googlesource.com/20111
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-01 23:34:33 +00:00
Austin Clements
7648387705 debug/elf: transparently decompress compressed sections
This adds support for compressed ELF sections. This compression is
treated as a framing issue and hence the package APIs all
transparently decompress compressed sections. This requires some
subtlety for (*Section).Open, which returns an io.ReadSeeker: since
the decompressed data comes from an io.Reader, this commit introduces
a Reader-to-ReadSeeker adapter that is efficient for common uses of
Seek and does what it can otherwise.

Fixes #11773.

Change-Id: Ic0cb7255a85cadf4c1d15fb563d5a2e89dbd3c36
Reviewed-on: https://go-review.googlesource.com/17341
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
2015-12-03 20:53:11 +00:00
Austin Clements
e1544d3bb6 dwbug/elf: support old-style compressed DWARF
GCC and LLVM support zlib-compressing DWARF debug sections (and
there's some evidence that this may be happening by default in some
circumstances now).

Add support for reading compressed DWARF sections. Since ELF
relocations apply to the decompressed data, decompression is done
before applying relocations. Since relcations are applied by
debug/elf, decompression must also be handled there.

Note that this is different from compressed ELF sections, which is a
more general mechanism used by very recent versions of GCC.

Updates #11773.

Change-Id: I3f4bf1b04d0802cc1e8fcb7c2a5fcf6c467c5089
Reviewed-on: https://go-review.googlesource.com/17340
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2015-12-03 20:53:04 +00:00
Yao Zhang
7ff52e13cd debug/elf: added MIPS ELF relocations
Change-Id: I05352749a852095baae2f67fd71ffcf5f727538d
Reviewed-on: https://go-review.googlesource.com/14453
Reviewed-by: Minux Ma <minux@golang.org>
2015-11-12 04:50:32 +00:00
Didier Spezia
8286f18b94 debug/elf: map/slice literals janitoring
Simplify slice/map literal expressions.
Caught with gofmt -d -s, fixed with gofmt -w -s
Reformatted some expressions to improve readability.

Change-Id: Iaf123e6bd49162ec45c59297ad3b002ca59443bc
Reviewed-on: https://go-review.googlesource.com/13850
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2015-08-25 01:36:11 +00:00
Ian Lance Taylor
61cd48b1ce debug/elf: change R_ARM_REL32 to R_ARM_ABS32 in applyRelocationsARM
The original version of applyRelocationsARM was added in
http://golang.org/cl/7266.  It was added to fix the ARM build, which
had been broken by http://golang.org/cl/6780.

Before CL 6780, there was no relocation processing for ARM.  CL 6780
changed the code to require relocation processing for every supported
target.  CL 7266 fixed the ARM build by adding a relocation processing
function, but in fact no actual processing was done.  The code only
looked for REL32 relocations, but ARM debug info has no such
relocations.  The test case added in CL 7266 doesn't have any either.

This didn't matter because no relocation processing was required on
ARM, at least not for GCC-generated debug info.  GCC generates ABS32
relocations, but only against section symbols which have the value 0.
Therefore, the addition done by correct handling of ABS32 doesn't
change anything.

Clang, however, generates ABS32 relocations against local symbols,
some of which have non-zero values.  For those, we need to handle
ABS32 relocations.

This patch corrects the CL 7266 to look for ABS32 relocations instead
of REL32 relocations.  The code was already written to correctly
handle ABS32 relocations, it just mistakenly said REL32.

This is the ARM equivalent of https://golang.org/cl/96680045, which
fixed the same problem in the same way for clang on 386.

With this patch, clang-3.5 can be used to build Go on ARM GNU/Linux.

Fixes #8980.

Change-Id: I0c2d72eadfe6373bde99cd03eee40de6a582dda1
Reviewed-on: https://go-review.googlesource.com/11222
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
2015-06-26 16:17:54 +00:00
Austin Clements
d7d1337368 debug/dwarf: add DWARF attribute value class to Field
To return DWARF attribute values, debug/dwarf maps the DWARF attribute
value classes to Go types. Unfortunately, this mapping is ambiguous in
a way that makes it impossible to correctly interpret some DWARF
attributes as of DWARF 4. For example, AttrStartScope can be either a
constant or a rangelistptr. The attribute is interpreted differently
depending on its class, but debug/dwarf maps both classes to int64, so
the caller can't distinguish them from the Go type.
AttrDataMemberLocation is similar.

To address this, this change adds a field to type Field that indicates
the exact DWARF attribute value class of that field's value. This
makes it possible to distinguish value classes that can't be
distinguished by their Go type alone.

The root of this type ambiguity was DWARF itself. For example, DWARF 2
made no distinction between constants that were just constants and
constants that were section offsets because no attribute could have
both meanings. Hence, the single int64 type was sufficient. To avoid
introducing just another layer of ambiguity, this change takes pains
to canonicalize ambiguous classes in DWARF 2 and 3 files into the
unambiguous classes of DWARF 4.

Of course, there's no guarantee that future DWARF versions won't do
the same thing again and further subdivide the DWARF 4 classes. This
change gets ahead of this somewhat by distinguishing the various *ptr
classes even though the encoding does not. If there's some other form
of split, we can handle this in a backwards-compatible way by
introducing, for example, a Class5 field and type.

Change-Id: I4ef96d1223b0fd7f96ecf44fcc0e704a36af02b4
Reviewed-on: https://go-review.googlesource.com/8502
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-04-12 14:37:35 +00:00
Ian Lance Taylor
5158147e24 debug/elf: support reading debug info from 32-bit PPC objects
Fixes #10118.

Change-Id: I4a2e6748db609c6eed1d68c824b81c59bd7b875c
Reviewed-on: https://go-review.googlesource.com/7590
Reviewed-by: Minux Ma <minux@golang.org>
2015-03-14 01:31:28 +00:00
Dave Cheney
b353a69509 debug/elf: fix arm build
This change adds the minimum necessary to implement applyRelocations.

For adg, this code uses the switch statement.

Change-Id: I0989daab8d0e36c2a4f6a315ced258b832744616
Reviewed-on: https://go-review.googlesource.com/7266
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-03-11 01:37:57 +00:00
Austin Clements
2bd616b1a7 build: merge the great pkg/ rename into dev.power64
This also removes pkg/runtime/traceback_lr.c, which was ported
to Go in an earlier commit and then moved to
runtime/traceback.go.

Reviewer: rsc@golang.org
          rsc: LGTM
2014-10-22 13:25:37 -04:00
Russ Cox
c007ce824d build: move package sources from src/pkg to src
Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
2014-09-08 00:08:51 -04:00