1. The dynamic loaders should not be needed for loading minidumps
and they may create problems (ex. the macOS loader resets the list of
loaded sections, which for minidumps are already set up during minidump loading)
2. In general, the extra plugins can do extraneous work which hurts performance
(ex. trying to set up implicit symbolic breakpoints, which in turn will trigger
extra debug information loading)
Differential Revision: https://reviews.llvm.org/D51176
llvm-svn: 340578
Normally, LLDB is creating a high-fidelity representation of a live
process, including a list of modules and sections, with the
associated memory address ranges. In order to build the module and
section map LLDB tries to locate the local module image (object file)
and will parse it.
This does not work for postmortem debugging scenarios where the crash
dump (minidump in this case) was captured on a different machine.
Fortunately the minidump format encodes enough information about
each module's memory range to allow us to create placeholder modules.
This enables most LLDB functionality involving address-to-module
translations.
Also, we may want to completly disable the search for matching
local object files if we load minidumps unless we can prove that the
local image matches the one from the crash origin.
(not part of this change, see: llvm.org/pr35193)
Example: Identify the module from a stack frame PC:
Before:
thread #1, stop reason = Exception 0xc0000005 encountered at address 0x164d14
frame #0: 0x00164d14
frame #1: 0x00167c79
frame #2: 0x00167e6d
frame #3: 0x7510336a
frame #4: 0x77759882
frame #5: 0x77759855
After:
thread #1, stop reason = Exception 0xc0000005 encountered at address 0x164d14
frame #0: 0x00164d14 C:\Users\amccarth\Documents\Visual Studio 2013\Projects\fizzbuzz\Debug\fizzbuzz.exe
frame #1: 0x00167c79 C:\Users\amccarth\Documents\Visual Studio 2013\Projects\fizzbuzz\Debug\fizzbuzz.exe
frame #2: 0x00167e6d C:\Users\amccarth\Documents\Visual Studio 2013\Projects\fizzbuzz\Debug\fizzbuzz.exe
frame #3: 0x7510336a C:\Windows\SysWOW64\kernel32.dll
frame #4: 0x77759882 C:\Windows\SysWOW64\ntdll.dll
frame #5: 0x77759855 C:\Windows\SysWOW64\ntdll.dll
Example: target modules list
Before:
error: the target has no associated executable images
After:
[ 0] C:\Windows\System32\MSVCP120D.dll
[ 1] C:\Windows\SysWOW64\kernel32.dll
[ 2] C:\Users\amccarth\Documents\Visual Studio 2013\Projects\fizzbuzz\Debug\fizzbuzz.exe
[ 3] C:\Windows\System32\MSVCR120D.dll
[ 4] C:\Windows\SysWOW64\KERNELBASE.dll
[ 5] C:\Windows\SysWOW64\ntdll.dll
NOTE: the minidump format also includes the debug info GUID, so we can
fill-in the module UUID from it, but this part was excluded from this change
to keep the changes simple (the LLDB UUID is hardcoded to be either 16 or
20 bytes, while the CodeView GUIDs are normally 24 bytes)
Differential Revision: https://reviews.llvm.org/D45700
llvm-svn: 330302
The main change is to avoid setting the process state as running when
debugging core/minidumps (details in the bug). Also included a few small,
related fixes around how the errors propagate in this case.
Fixed the FreeBSD/Windows break: the intention was to keep
Process::WillResume() and Process::DoResume() "in-sync", but this had the
unfortunate consequence of breaking Process sub-classes which don't override
WillResume().
The safer approach is to keep Process::WillResume() untouched and only
override it in the minidump and core implementations.
patch by lemo
Bug: https://bugs.llvm.org/show_bug.cgi?id=34532
Differential Revision: https://reviews.llvm.org/D37651
llvm-svn: 313655
This renames the LLDB error class to Status, as discussed
on the lldb-dev mailing list.
A change of this magnitude cannot easily be done without
find and replace, but that has potential to catch unwanted
occurrences of common strings such as "Error". Every effort
was made to find all the obvious things such as the word "Error"
appearing in a string, etc, but it's possible there are still
some lingering occurences left around. Hopefully nothing too
serious.
llvm-svn: 302872
This moves the following classes from Core -> Utility.
ConstString
Error
RegularExpression
Stream
StreamString
The goal here is to get lldbUtility into a state where it has
no dependendencies except on itself and LLVM, so it can be the
starting point at which to start untangling LLDB's dependencies.
These are all low level and very widely used classes, and
previously lldbUtility had dependencies up to lldbCore in order
to use these classes. So moving then down to lldbUtility makes
sense from both the short term and long term perspective in
solving this problem.
Differential Revision: https://reviews.llvm.org/D29427
llvm-svn: 293941
Summary:
One of the tests was flaky, because similarly to
https://reviews.llvm.org/D18697 (rL265391) - if there is a process running
which is with the same PID as in the core file, the minidump
core file debugging will fail, because we get some information from the
running process.
The fix is routing the ProcessInfo requests through the Process class
and overriding it in ProcessMinidump to return correct data.
Reviewers: labath
Subscribers: lldb-commits, beanz
Differential Revision: https://reviews.llvm.org/D26193
llvm-svn: 285698
Summary:
This plugin resembles the already existing Windows-only Minidump plugin.
The WinMinidumpPlugin uses the Windows API for parsing Minidumps
while this plugin is cross-platform because it includes a Minidump
parser (which is already commited)
It is able to produce a backtrace, to read the general puprose regiters,
inspect local variables, show image list, do memory reads, etc.
For now the only arches that this supports are x86_32 and x86_64.
This is because I have only written register contexts for those.
Others will come in next CLs.
I copied the WinMinidump tests and adapted them a little bit for them to
work with the new plugin (and they pass)
I will add more tests, aiming for better code coverage.
There is still functionality to be added, see TODOs in code.
Reviewers: labath, zturner
Subscribers: beanz, mgorny, modocache, lldb-commits, amccarth
Differential Revision: https://reviews.llvm.org/D25905
llvm-svn: 285587
Tests are failing and build is failing on windows and darwin.
Will fix and commit it later
-------------------------------------------------------------
Revert "xfailing minidump tests again ... :("
This reverts commit 97eade002c9e43c1e0d11475a4888083a8965044.
Revert "Fixing new Minidump plugin tests"
This reverts commit 0dd93b3ab39c8288696001dd50b9a093b813b09c.
Revert "Add the new minidump files to the Xcode project."
This reverts commit 2f638a1d046b8a88e61e212220edc40aecd2ce44.
Revert "xfailing tests for Minidump plugin"
This reverts commit 99311c0b22338a83e6a00c4fbddfd3577914c003.
Revert "Adding a new Minidump post-mortem debugging plugin"
This reverts commit b09a7e4dae231663095a84dac4be3da00b03a021.
llvm-svn: 283352
Summary:
This plugin resembles the already existing Windows-only Minidump plugin.
The WinMinidumpPlugin uses the Windows API for parsing Minidumps
while this plugin is cross-platform because it includes a Minidump
parser (which is already commited)
It is able to produce a backtrace, to read the general puprose regiters,
inspect local variables, show image list, do memory reads, etc.
For now the only arch that this supports is x86 64 bit
This is because I have only written a register context for that arch.
Others will come in next CLs.
I copied the WinMinidump tests and adapted them a little bit for them to
work with the new plugin (and they pass)
I will add more tests, aiming for better code coverage.
There is still functionality to be added, see TODOs in code.
Reviewers: labath, zturner
Subscribers: beanz, mgorny, amccarth, lldb-commits, modocache
Differential Revision: https://reviews.llvm.org/D25196
llvm-svn: 283259
Leonard Mosescu