Adding the new forms by type and processing should avoid
the problems with 0c0e24f709,
where new forms weren't handled in switch statements, breaking
the build.
Testing this should follow the testing for DW_FORM_GNU_str_index,
very closely, but there doesn't appear to be any tests for that,
or even DW_FORM_strp.
Change-Id: I609d56b1dc879971bfef1070f063f8457fec6017
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2233839
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
__WORDSIZE is an internal libc definition. Instead, we can use
ULONG_MAX from limits.h, whose value corresponds to the machine's
native word size.
This allows us to remove the fallback definition of __WORDSIZE in
the Android compatibility headers.
Bug: google-breakpad:631
Change-Id: I7b9e6f3b2121f78ccad9e32bf26acac518aefd8f
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2107100
Reviewed-by: Mike Frysinger <vapier@chromium.org>
This reverts commit 0c0e24f709.
Reason for revert: This is causing breakage on CrOS due to unhandled
enums and dwarf5 support is in limbo, so pull this back out for now.
Bug: google-breakpad:812
Change-Id: I22dd5d87efb8bc83596d51d15a6808c41afb3fd2
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2095872
Reviewed-by: Mark Mentovai <mark@chromium.org>
This reverts commit dbd454dbe4.
Reason for revert: The parent CL is causing breakage on CrOS due to
unhandled enums. Before we can revert that, we need to revert this.
Bug: google-breakpad:812
Change-Id: I7c2446f3cd8ed9f6411e90dbdd2434bc463b2f6c
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2095798
Reviewed-by: Mark Mentovai <mark@chromium.org>
This enables the DWARF reader to properly parse DW_AT_ranges attributes
in compilation units and functions. Code covered by a function is now
represented by a vector of ranges instead of a single contiguous range
and DW_AT_ranges entries are used to populate it. All the code and tests
that assumed functions to be contiguous entities has been updated to
reflect the change. DW_AT_ranges attributes found in compilation units
are parsed but no data is generated for them as it is not currently needed.
BUG=754
Change-Id: I310391b525aaba0dd329f1e3187486f2e0c6d442
Reviewed-on: https://chromium-review.googlesource.com/1124721
Reviewed-by: Ted Mielczarek <ted.mielczarek@gmail.com>
This silences a warning in newer versions of clang that complains
about "register" being a deprecated keyword.
Bug: chromium:780692
Change-Id: If354b9b18421e3e910849b385c44207e0ce02590
Reviewed-on: https://chromium-review.googlesource.com/750362
Reviewed-by: Mark Mentovai <mark@chromium.org>
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>
For more details take a look at common/using_std_string.h
BUG=
Change-Id: Ifebfc57f691ef3a3bef8cfed7106c567985edffc
Reviewed-on: https://chromium-review.googlesource.com/399738
Reviewed-by: Mark Mentovai <mark@chromium.org>
CIE looks like it's been emitted by clang since ~May 2015 [1]. This
means that we didn't have any CFI because this parse aborted, which
meant that all stack walks reverted to stack scanning. Allow expected
values for address size and segment descriptor size through so that
dump_syms can generate at least somewhat reasonable data.
[1]: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150518/277292.htmlR=mark@chromium.org
BUG=chromium:627529
Change-Id: I6dc92f51c4afd25c2adff92c09ccb8bb03bf9112
Reviewed-on: https://chromium-review.googlesource.com/406012
Reviewed-by: Mark Mentovai <mark@chromium.org>
The Rust compiler uses GCC C++ name mangling, but it has another layer of
encoding so abi::cxa_demangle doesn't produce great results. This patch
changes dump_syms to dump unmangled names by default so that consumers can
demangle them after-the-fact.
It also adds a tiny bit of support for linking against a Rust library I wrote
that can demangle Rust symbols nicely:
https://github.com/luser/rust-demangle-capi
BUG=
Change-Id: I63a425035ebb7ac516f067fed2aa782849ea9604
Reviewed-on: https://chromium-review.googlesource.com/402308
Reviewed-by: Mark Mentovai <mark@chromium.org>
The DWARF data for Swift code has a top-level DW_TAG_module DIE as the
child of the DW_TAG_compile_unit DIE and the parent of the
DW_TAG_subprogram DIEs that dump_syms uses to locate functions.
dump_syms needs to process DW_TAG_module DIEs as introducing nested
scopes to make it work with Swift.
This also reworks demangling to be language-specific, so that the C++
demangler isn't invoked when processing Swift code. The DWARF data for
Swift code presents its mangled names in the same form as used for C++
(DW_AT_MIPS_linkage_name or DW_AT_linkage_name) but the mangling is
Swift-specific (beginning with _T instead of _Z). There is no
programmatic interface to a Swift name demangler as an analogue to C++'s
__cxa_demangle(), so mangled Swift names are exposed as-is. Xcode's
"xcrun swift-demangle" can be used to post-process these mangled Swift
names on macOS.
Support for mangled names presented in a DW_AT_linkage_name attribute,
as used by DWARF 4, is added. This supersedes the earlier use of
DW_AT_MIPS_linkage_name.
BUG=google-breakpad:702,google-breakpad:715
R=ted.mielczarek@gmail.com
Review URL: https://codereview.chromium.org/2147523005 .
For more details take a look at common/using_std_string.h
BUG=
Change-Id: I11f1ce697be23e13f12ea8f0468bbe02fa63c967
Reviewed-on: https://chromium-review.googlesource.com/378159
Reviewed-by: Mark Mentovai <mark@chromium.org>
We tried to use common/android/include/elf.h, however it contains
'#include-next elf.h' so it still breaks MAC build. So we use
third_party/musl/include/elf.h instead.
BUG=none
TEST=make; make test passes. There is no '#include-next elf.h' in
the new elf.h
R=michaelbai@chromium.org
Review URL: https://codereview.chromium.org/1994633003 .
This added debug fission support.
It tries to find the dwp file from the debug dir /usr/lib/debug/*/debug
and read symbols from them.
Most of this patch comes from
https://critique.corp.google.com/#review/52048295
and some fixes after that.
The elf_reader.cc comes from TOT google code. I just
removed some google dependency.
Current problems from this patch
1: Some type mismatch: from uint8_t * to char *.
2: Some hack to find the .dwp file. (replace .debug with .dwp)
BUG=chromium:604440
R=dehao@google.com, ivanpe@chromium.org
Review URL: https://codereview.chromium.org/1884283002 .
Newer gcc versions default to -Werror=narrowing when using newer C++
standards (which we do). This causes issues when we try to stuff a
value like 0xea into a char -- the value is out of range for signed
char bytes. That's when gcc throws an error:
.../bytereader_unittest.cc: In member function 'virtual void Reader_DW_EH_PE_absptr4_Test::TestBody()':
.../bytereader_unittest.cc:400:55: error: narrowing conversion of '234' from 'int' to 'char' inside { } [-Wnarrowing]
BUG=chromium:579384
TEST=`make check` passes
R=mark@chromium.org
Review URL: https://codereview.chromium.org/1605153004 .
MSVC does not have the __PTRDIFF_TYPE__ macro defined, so I use the
standard [u]intptr_t types instead. Compilation tested on windows, linux
and mac.
BUG=
R=mark@chromium.org
Review URL: https://codereview.chromium.org/1571293003 .
Patch from Pavel Labath <labath@google.com>.
Previously, dump_syms did not handle DW_FORM_ref_addr if it appeared
in DWARF 4 debugging info.
Also fix a DW_FORM_ref_addr case so that it doesn't fall through to
the next switch case when assertions are disabled and the DWARF
version isn't recognised.
The following steps will reproduce the problem when using LLVM 3.4:
cat <<END >example1.c
int main() { return 0; }
END
cat <<END >example2.c
void foo(int x) {}
END
clang -emit-llvm -g -c example1.c -o example1.bc
clang -emit-llvm -g -c example2.c -o example2.bc
llvm-link-3.4 example1.bc example2.bc -o combined.bc
clang combined.bc -o executable
./google-breakpad/build/src/tools/linux/dump_syms/dump_syms executable
When using LLVM bitcode linking in this way, LLVM's backend generates
partially-merged DWARF debugging info in which some of the references
to the "int" type go via "DW_FORM_ref_addr". Since PNaCl uses LLVM
bitcode linking, this dump_syms failure occurs with nexes produced by
the PNaCl toolchain.
BUG= https://code.google.com/p/chromium/issues/detail?id=416368
TEST= see above
R=mark@chromium.org, mcgrathr@chromium.org
Review URL: https://breakpad.appspot.com/5744002
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1408 4c0a9323-5329-0410-9bdc-e9ce6186880e
This patch allows Breakpad's DWARF reader to at least read or skip
attributes using the new forms defined in version 4 of the DWARF
specification, instead of crashing.
Attributes encoded using DW_FORM_flag_present, DW_FORM_sec_offset, and
DW_FORM_exprloc should work fine now. However, compilation units using
DW_FORM_ref_sig8 to refer to types in .debug_types will need further work
to support. (GCC 4.6.2 does not emit .debug_types sections.)
Specifically:
- dwarf2reader::DwarfForm gets new values.
- dwarf2reader::Dwarf2Handler and dwarf2reader::DIEHandler get new handler
methods, named ProcessAttributeSignature, for DW_FORM_ref_sig8 attributes.
- dwarf2reader::CompilationUnit reads DW_FORM_ref_sig8 attributes, and
passes them to ProcessAttributeSignature. It also gets support for
DW_FORM_sec_offset, DW_FORM_exprloc, and DW_FORM_flag_present, using the
existing appropriate ProcessAttribute* methods.
- dwarf2reader::DIEDispatcher passes through ProcessAttributeSignature
attributes to its DIEHandler.
- Unit tests are updated.
a=jimb, r=ted.mielczarek
Review URL: http://breakpad.appspot.com/343003/
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@912 4c0a9323-5329-0410-9bdc-e9ce6186880e
This is really incomplete --- it's just what's needed to get started
testing support for the DWARF 4 attribute forms.
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@910 4c0a9323-5329-0410-9bdc-e9ce6186880e
forbidden by the style guide, and are bad practice in headers even under
style rules that tolerate this construct.
This fixes warnings such as:
In file included from dwarf2reader.cc:34:
dwarf2reader.h:53:17: warning: using namespace directive in global context in header [-Wheader-hygiene]
Review URL: http://breakpad.appspot.com/312002
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@862 4c0a9323-5329-0410-9bdc-e9ce6186880e
After the final DIE in a compilation unit, there may be any number of
zero bytes present. This is meant to allow producers to align
compilation unit starting points when necessary.
This patch changes the dwarf2reader::CompilationUnit class to skip
those zero bytes, rather than interpreting them as 'end of children'
markers for DIEs that do not exist. Without this change, the padding
bytes will cause the reader to attempt to pop an offset from an empty
stack, and call EndDIE with a garbage offset.
a=jimblandy, r=mmentovai
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@667 4c0a9323-5329-0410-9bdc-e9ce6186880e
Perhaps there once was some reason one needed the DIE offset stack to
have an unusual lifetime, but there is none now.
a=jimblandy, r=mmentovai
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@666 4c0a9323-5329-0410-9bdc-e9ce6186880e
