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Mirror of Google Breakpad project
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Mark Mentovai 7c409af709 Parse DWARF 4 line tables correctly 
Breakpad’s DWARF line table reader only understood line tables at the
level of DWARF 2. This wasn’t a problem because LLVM only produced line
tables at this level, even when generating DWARF 4. But LLVM would like
to output DWARF 4 line tables when generating DWARF 4, and Breakpad
needs to understand this format. (Meanwhile, it seems that GCC has used
DWARF 4 line tables with DWARF 4 output since 4.5.0, 2010-04-14.)

DWARF 3 line tables are fully compatible with DWARF 2 (assuming that
nothing needs “prologue end,” “epilogue begin,” or “isa”, and opcodes
related to these fields are properly skipped). DWARF 4 changes the line
number program header slightly to include a “maximum operations per
instruction” field. This field must be recognized, but can safely be
ignored (and assumed to be always 1) if VLIW architectures are not
supported (they aren’t). DWARF 4 also introduces a “discriminator”,
whose opcode can also be skipped if these values are not needed (they
shouldn’t be).

This recognizes the “maximum operations per instruction” field when
processing DWARF 4 line tables, but asserts that its value is 1 and
otherwise ignores it.

This is not compatible with VLIW architectures that set this field to a
value other than 1. Such architectures are irrelevant to Breakpad, and
mainline GCC and the proposed LLVM patch always set this field to 1.
There are other things that could be extracted from DWARF 3 and 4 line
tables that aren’t currently extracted (although these are currently
irrelevant to Breakpad too).

Bug: google-breakpad:745
Change-Id: I5bf9c0b1aa654849c9cce64e60682447d10be8ba
Reviewed-on: https://chromium-review.googlesource.com/663441
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2017-09-13 19:50:52 +00:00
android sample_app: enable C++11 for Android builds 2016-04-04 21:35:26 -04:00
autotools autotools: refresh config.{sub,guess} 2017-02-06 13:57:59 -05:00
docs Update links 2016-11-18 17:24:37 +00:00
m4 Only use O_CLOEXEC on platforms that support it 2017-05-10 21:32:37 +00:00
scripts travis: add a clang build 2017-02-17 16:53:16 +00:00
src Parse DWARF 4 line tables correctly 2017-09-13 19:50:52 +00:00
.gitignore A couple of minor fixes 2017-07-11 17:24:47 +00:00
.travis.yml travis: add a clang build 2017-02-17 16:53:16 +00:00
aclocal.m4 Only use O_CLOEXEC on platforms that support it 2017-05-10 21:32:37 +00:00
appveyor.yml Appveyor CI for Windows MSVS build 2017-02-13 17:57:15 +00:00
AUTHORS Make build system less annoying (#8) r=bryner 2006-08-30 20:05:05 +00:00
breakpad-client.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
breakpad.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
ChangeLog Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
codereview.settings Switch to Gerrit for code reviews 2016-07-27 20:07:49 +00:00
configure Only use O_CLOEXEC on platforms that support it 2017-05-10 21:32:37 +00:00
configure.ac Only use O_CLOEXEC on platforms that support it 2017-05-10 21:32:37 +00:00
default.xml roll lss deps 2017-06-16 04:05:08 +00:00
DEPS Update GYP to 324dd166b7c0b39d513026fa52d6280ac6d56770 2017-08-28 16:07:05 +00:00
INSTALL autoreconf -f -i 2013-12-10 17:53:50 +00:00
LICENSE Renaming file COPYING to LICENSE and appending the disclaimer from src/common/convert_UTF.h to LICENSE. 2014-02-27 19:23:16 +00:00
Makefile.am autotools: move -W flags to configure detection 2017-02-16 22:48:56 +00:00
Makefile.in autotools: move -W flags to configure detection 2017-02-16 22:48:56 +00:00
NEWS Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
README.ANDROID Update symbol file documentation links. 2016-06-10 06:29:06 -04:00
README.md Appveyor CI for Windows MSVS build 2017-02-13 17:57:15 +00:00

README.md

Breakpad

Breakpad is a set of client and server components which implement a crash-reporting system.

Getting started (from master)

  1. First, download depot_tools and ensure that they’re in your PATH.

  2. Create a new directory for checking out the source code (it must be named breakpad).

    mkdir breakpad && cd breakpad

  3. Run the fetch tool from depot_tools to download all the source repos.

    fetch breakpad
cd src

  4. Build the source.

    ./configure && make

    You can also cd to another directory and run configure from there to build outside the source tree.

    This will build the processor tools (src/processor/minidump_stackwalk, src/processor/minidump_dump, etc), and when building on Linux it will also build the client libraries and some tools (src/tools/linux/dump_syms/dump_syms, src/tools/linux/md2core/minidump-2-core, etc).

  5. Optionally, run tests.

    make check

  6. Optionally, install the built libraries

    make install

If you need to reconfigure your build be sure to run make distclean first.

To update an existing checkout to a newer revision, you can git pull as usual, but then you should run gclient sync to ensure that the dependent repos are up-to-date.

To request change review

  1. Follow the steps above to get the source and build it.

  2. Make changes. Build and test your changes. For core code like processor use methods above. For linux/mac/windows, there are test targets in each project file.

  3. Commit your changes to your local repo and upload them to the server. http://dev.chromium.org/developers/contributing-code e.g. git commit ... && git cl upload ... You will be prompted for credential and a description.

  4. At https://chromium-review.googlesource.com/ you'll find your issue listed; click on it, then “Add reviewer”, and enter in the code reviewer. Depending on your settings, you may not see an email, but the reviewer has been notified with google-breakpad-dev@googlegroups.com always CC’d.