1) Convert iterator-based for loops to C++11 foreach loops.
2) Convert "void operator=" to "T& operator=".
3) Switch from copy operators from private to public deleted.
4) Switch from empty ctors / dtors to "= default" where appropriate.
PiperOrigin-RevId: 246679195
Use clang-format to correct formatting to be in agreement with the [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html). Doing this simplifies the process of accepting changes. Also fixed a few warnings flagged by clang-tidy.
PiperOrigin-RevId: 246350737
The Travis configuration:
1) Installs recent versions of clang and GCC.
2) Sets up the environment so that CMake picks up the installed
compilers. Previously, the pre-installed clang compiler was used
instead.
3) Requests a modern macOS image that has all the headers needed by GCC.
The CL also removes now-unnecessary old workarounds from the
Travis configuration.
PiperOrigin-RevId: 245831188
Windows linking visibility in shared libraries requires that inner classes are
specifically exported as visible, even if the containing class is exported.
PiperOrigin-RevId: 244886019
Fix a possible array bounds offset issue flagged in
issue #668. Not the source of any known bug, but will
silence any static analyzers.
PiperOrigin-RevId: 243697659
There were a few members which were identified to have been left
uninitialized in some constructors. These were very likely to
have been set before being used, otherwise the ASan tests would
have caught them, but still good practice to have them
initialized. This addresses some items reported in issue #668.
PiperOrigin-RevId: 243370145
cout/endl were missing the std namespace. Also std::make_unique
was used inadvertently which is part of C++14 and only C++11
is currently supported.
PiperOrigin-RevId: 243221310
Closesgoogle/leveldb#320
During compaction it was possible that records from a block b1=(l1,u1)
would be pushed down from level i to level i+1. If there is a block
b2=(l2,u2) at level i with k1 = user_key(u1) = user_key(l2) then
a subsequent search for k1 will yield the record l2 which has a smaller
sequence number than u1 because the sort order for records sorts
increasing by user key but decreaing by sequence number.
This change add a call to a new function AddBoundaryInputs to
SetupOtherInputs. AddBoundaryInputs searches for a block b2 matching the
criteria above and adds it to the set of files to be compacted. Whenever
AddBoundaryInputs is called it is important that the compaction fileset
in level i+1 (known as c->inputs_[1] in the code) be recomputed. Each
call to AddBoundaryInputs is followed by a call to GetOverlappingInputs.
SetupOtherInputs is called on both manual and automated compaction
passes. It is called for both level zero and for levels greater than 0.
The original change posted in https://github.com/google/leveldb/pull/339
has been modified to also include changed made by Chris Mumford<cmumford@google.com>
in 4b72cb14f8
1. Releasing snapshots during test cleanup to avoid
memory leak warnings.
2. Refactored test to use testutil.h to be in line
with other issue tests and to create the test
database in the correct temporary location.
3. Added copyright banner.
Otherwise, just minor formatting and limiting character
width to 80 characters.
Additionally the change was rebased on top of current master and
changes previously made to the Makefile were ported to the
CMakeLists.txt.
Testing Done:
A test program (issue320_test) was constructed that performs mutations
while snapshots are active. issue320_test fails without this bug fix
after 64k writes. It passes with this bug fix. It was run with 200M
writes and passed.
Unit tests were written for the new function that was added to the
code. Make test was run and seen to pass.
Signed-off-by: Richard Cole <richcole@amazon.com>
The documentation recommends modifying the whitelist after evaluating Copybara. However, evaluating requires significant workarounds without the whitelist entry. So, this CL adds leveldb to the whitelist early.
leveldb is currently open sourced to https://github.com/google/leveldb using MOE.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=240786286
This CL uses a well-known workaround for silencing arguments that may be unused, depending on the build configuration. The silenced warnings were responsible for a large amount of noise in the MSVC build on Windows.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=240357359
This change switches corruption_test, which previously used direct file
I/O to corrupt table files for open databases, to use InMemEnv. Using an
Env eliminates some platform dependencies thus simplifying the tests.
Also removed EnvWindowsTestHelper::RelaxFilePermissions(). This was
only added because the Windows Env opens files for exclusive access.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=239305329
FileState::Read (used by InMemoryEnv) creates a new Slice when reading.
If all the bytes for the read are in the first block then the Slice
points to the private block data in FileState and is not copied to the
|scratch| buffer.
A recent change allows files in InMemEnv to be overwritten which deletes
these blocks and in this case can result in a Slice having a dangling
pointer. This change fixes this bug by always copying to the |scratch|
buffer.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=239301930
This CL moves default values for
leveldb::{Options,ReadOptions,WriteOptions} from constructors to member
declarations, and removes now-redundant comments stating the defaults.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=239271242
Forgot one reference to atomic_pointer.h in CMakeLists.txt
from prior CL.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=237870915
This CL removes AtomicPointer from leveldb's port interface. Its usage is replaced with std::atomic<> from the C++11 standard library.
AtomicPointer was used to wrap flags, numbers, and pointers, so its instances are replaced with std::atomic<bool>, std::atomic<int>, std::atomic<size_t> and std::atomic<Node*>.
This CL does not revise the memory ordering. AtomicPointer's methods are replaced mechanically with their std::atomic equivalents, even when the underlying usage is incorrect. (Example: DBImpl::has_imm_ is written using release stores, even though it is always read using relaxed ordering.) Revising the memory ordering is left for future CLs.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=237865146
Env's (like the POSIX Env) which use an actual filesystem behave
differently than InMemoryEnv with regards to writing data to a currently
open file.
InMemoryEnv::NewWritableFile would previously delete that file,
if it was open, before creating a new file so any previously
open file would be unlinked. This change truncates an open file
so that subsequent reads will read that new data.
This should have no impact on leveldb as it never has the same
file open for both read and write access. This change is only
being made for tests (specifically a future change to corruption_test)
to allow them to be decoupled from the underlying platform and
allow them to use an Env.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=237858231
Fixes GitHub issue #657.
This CL also makes the Windows CI green.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=237255887
This CL fixes the following issues:
* The Travis CI had the ctest invocation followed by a ";", so non-zero
exit codes (indicating test failures) did not cause the build to fail.
* The AppVeyor CI had the ctest invocation followed by a ";", causing an
error on Windows, where "&" plays the role of ";" [1].
The Windows CI (AppVeyor) will still be red after this CL, as some of
the tests are failing. However, this CL is a step forward, as it gets us
from failing to start tests to running tests and recording success/error
states.
[1] https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-xp/bb490954(v=technet.10)#using-multiple-commands-and-conditional-processing-symbols
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=236765633
This change adds a native Windows port (port_windows.h) and a
Windows Env (WindowsEnv).
Note1: "small" is defined when including <Windows.h> so some
parameters were renamed to avoid conflict.
Note2: leveldb::Env defines the method: "DeleteFile" which is
also a constant defined when including <Windows.h>. The solution
was to ensure this macro is defined in env.h which forces
the function, when compiled, to be either DeleteFileA or
DeleteFileW when building for MBCS or UNICODE respectively.
This resolves#519 on GitHub.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=236364778
Apple doesn't follow POSIX specifications for fsync(). Instead, fsync() guarantees to flush the buffer cache to the device, which means the data will survive kernel panics, but may not survive power outages. Applications that need stronger guarantees (like databases) need to use fcntl(F_FULLFSYNC).
This CL switches PosixWritableFile::Sync() to get the stronger guarantees on Apple systems. The improved implementation follows the same principles as SQLite [1] and node.js [2].
Research for the fcntl() to fsync() fallback strategy:
Apple's released source code at https://opensource.apple.com/ shows at least three different error codes being returned when a filesystem does not support F_FULLFSYNC.
fcntl() is implemented in xnu-4903.221.2 in bsd/kern/kern_descrip.c, where it delegates to fcntl_nocancel(). The documentation for fcntl_nocancel() mentions error codes for some operations, but does not include F_FULLFSYNC. The F_FULLSYNC branch in fcntl_nocancel() calls VNOP_IOCTL(_, F_FULLSYNC, NULL, 0, _), whose return value sets the error
code.
VNOP_IOCTL() is implemented in bsd/vfs/kpi_vfs.c and calls the ioctl function in the vnode's operation vector. The per-filesystem function names follow the pattern _vnop_ioctl() for all the instances in opensource code: {hfs,msdosfs,nfs,ntfs,smbfs,webdav,zfs}_vnop_ioctl().
hfs-407.30.1, msdosfs-229.200.3, and nfs in xnu-4903.221.2 handle F_FULLFSYNC. ntfs-94.200.1 and smb-759.40.1 do not handle F_FULLFSYNC, and the default branch returns ENOSUP. webdav-380.200.1 also does not handle F_FULLFSYNC, but the default branch returns EINVAL. zfs-59 also does not handle F_FULLSYNC, and its default branch returns ENOTTY.
From a different angle, Apple's ntfs-94.200.1 includes utility code that uses fcntl(F_FULLFSYNC) and falls back to fsync() just like we do, supporting the hypothesis that there is no good way to detect lack of F_FULLFSYNC support. Also, Apple's fcntl() man page [3] does not mention a way to detect lack of F_FULLFSYNC support.
[1] https://www.sqlite.org/src/doc/trunk/src/os_unix.c
[2] https://github.com/libuv/libuv/blob/master/src/unix/fs.c
[3] https://developer.apple.com/library/archive/documentatiVon/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
Tested:
https://travis-ci.org/pwnall/leveldb/builds/477318498
TAP global presubmit
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=228593729
The CMake feature-detection code used check_symbol_exists(), which
invokes the C compiler. However, some glibc versions don't expose the
fdatasync() declaration when compiled with -std=c11, but do expose it
when compiled with -std=c++11. This most likely comes down to how
_POSIX_SOURCE is defined -- it needs to be >= 201112L for <unistd.h> to
expose fdatasync().
This CL switches to check_cxx_symbol_exists(), which uses the C++
compiler. Asides from fixing the problem above, this is the right thing
to do, because we use <unistd.h> in env_posix.cc, which is compiled with
the C++ compiler.
This CL also fixes a previously introduced inconsistency, where the
macro indicating the fdatasync() feature detection result was referred
to as HAVE_FDATASYNC and HAVE_FUNC_FDATASYNC. The former appears to be
used in other libraries, so this CL switches all our references to
HAVE_FDATASYNC.
Fixes https://github.com/google/leveldb/issues/629
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=228392612
