The porting layer implements threading primitives: atomic pointers,
condition variables, mutexes, thread-safe initialization. These are all
specified in C++11, so the reference open source port implementation can
become platform-independent.
The porting layer will remain in place to allow the use of other
implementations with more features, such as the built-in deadlock
detection in abseil's Mutex.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=193245934
Commit a0008deb67 introduced
std::numeric_limits usage in logging.cc, but didn't #include <limits>
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192840190
The old implementation caused odd crashes on ARM, which were fixed by
changing a local variable type. The main suspect is the use of a static
local variable. This CL replaces the static local variable with
constexpr, which still ensures the compiler sees the expressions as
constants.
The CL also replaces Slice operations in the functions' inner loop with
iterator-style pointer operations, which can help the compiler generate
less code.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192832175
ConsumeDecimalNumber has fairly non-trivial logic, and a previous
version has crashed inexplicably on Android. Having some test coverage
will make it easier to tweak / simplify the function later on.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192821751
This is an accidental leftover from the CMake migration. The macro has
been replaced with LEVELDB_IS_BIG_ENDIAN.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192364918
The CMake-based build relies on __has_include, which is standardized in
C++17. Unfortunately, __has_include is available without requiring
--std=c++17 on all the compilers on CI, so this problem was not caught.
Fixes https://github.com/google/leveldb/issues/572
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192208842
After this CL, all classes with Mutex members should be covered by annotations. Exceptions are atomic members, which shouldn't need locking, and DBImpl members that cause errors when annotated, which will be tackled separately.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=190260865
C++11 requires <atomic>. This lets us remove the header detection
(LEVELDB_ATOMIC_PRESENT) and simplify port/atomic_pointer.h.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189919098
This CL switches the public headers to C++11 default and deleted constructors, and adds override to the relevant leveldb::EnvWrapper methods. This should be a good test for C++11 compiler support.
Once this CL settles, the rest of the codebase can be safely modernized to C++11.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189873212
helpers/memenv/memenv.cc used SIZE_MAX without including <stdint.h>.
Since we're fixing this problem, replace SIZE_MAX with
std::numeric_limits<size_t>::max(), which is clearer.
Fixes https://github.com/google/leveldb/issues/562
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189821707
This CL makes it easier to reason about thread safety by:
1) Adding Clang thread safety annotations according to comments.
2) Expanding a couple of variable names, without adding extra lines of code.
3) Adding const in a couple of places.
4) Replacing an always-non-null const pointer with a reference.
5) Fixing style warnings in the modified files.
This CL does not annotate the DBImpl members that claim to be protected
by the instance mutex, but are accessed without the mutex being held.
Those members (and their unprotected accesses) will be addressed in
future CLs.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189354657
This CL removes unused headers included by util/testharness.h, adds
precise includes where the build breaks, and fixes style errors in the
edited files.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189331061
External linkage is the default for function declarations in C++.
This also fixes ClangTidy errors generated by removing the "extern"
keyword as described above.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188730416
This is a stopgap for removing warnings on Mac builds, so -Werror can be
turned on. C++11 will be required in the nearby future, which guarantees
<atomic> support. Once that happens, the simplified version of this will
match https://github.com/google/leveldb/pull/503
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188553251
This aligns the Travis CI configuration with google/crc32c and
google/snappy, to simplify maintenance.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188547648
This removes the use of the non-portable headers <sys/types.h> and <unistd.h> in c_test.c.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188503102
When the max file size option was added in CL 134391640 the C API
was not modified to support this.
This change was contributed by GitHub user @olt and fixes issue #439.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173466388
The C++ style guide URL was wrong.
This fixes issue #394. Reported by GitHub user @Loki-Astari.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173188573
Deleted two unused assignments:
1. offset_in_block in Reader::SkipToInitialBlock().
2. in_fragmented_record in Reader::ReadRecord().
Reasons for the change:
1. offset_in_block is not read again after the if condition.
2. The kFullRecordType switch branch returns, so
in_fragmented_record isn't read again.
3. The kFirstType switch branch sets in_fragmented_record to
true after the if, so the write in the if is ignored.
Change contributed by @C0deAi on GitHub.
This fixes https://github.com/google/leveldb/issues/517
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=172763897
This follows the general naming convention for preprocessor macros used
to detect feature (library / header file / symbol) presence.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171184641
CL 170738066 removed all instances of fread_unlocked, fwrite_unlocked
and fflush_unlocked calls from the codebase, so the feature detection
can be removed as well.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171154269
gcc defaults to exporting all symbols, but other linkers do not. Adding
the LEVELDB_EXPORT macro allows a project to set LEVELDB_SHARED_LIBRARY
when building/linking with leveldb as a shared library.
This is to allow leveldb to be created as a shared library on all
platforms support by Chrome and enables a fix for
https://bugs.chromium.org/p/chromium/issues/detail?id=764810.
This also has the benefit of reducing the shared library size from
418863 to 380367 bytes (64-bit Linux).
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171037148
CL 170738066 introduced std::min and std::max to env_test.cc. These
require the <algorithm> header.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171024062
Deleting a PosixWritableFile without calling Close() leaks the file
descriptor. While the API description in include/leveldb/env.h does not
specify whether the caller is responsible for Close()ing the file before
deleting it, all other Env file implementations do release underlying
resources when destroyed, even if Close() is not called.
The leak shows up when running db_tests on Mac Travis, or on a vanilla
MacOS install.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170906843
This also removes std::unique_ptr introduced in CL 170738066, because
it's C++11-only, and the open source version still supports older
versions at the moment.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170876919
If the file already existed, we should have truncated it. This was not
detected by leveldb tests since leveldb code avoids reusing same files,
but there was code elsewhere that was directly using leveldb files and
relying on this behavior.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170769101
If leveldb::Options::block_cache is set to a cache of zero capacity
then it is possible for LRUHandle::next to be used without having been
set.
Conditional jump or move depends on uninitialised value(s):
leveldb::(anonymous namespace)::LRUHandle::key() const (cache.cc:58)
leveldb::(anonymous namespace)::LRUCache::Unref(leveldb::(anonymous namespace)::LRUHandle*) (cache.cc:234)
leveldb::(anonymous namespace)::LRUCache::Release(leveldb::Cache::Handle*) (cache.cc:266)
leveldb::(anonymous namespace)::ShardedLRUCache::Release(leveldb::Cache::Handle*) (cache.cc:375)
leveldb::CacheTest::Insert(int, int, int) (cache_test.cc:59)
This bug forced a commit reversion in Chromium. For more information see
https://bugs.chromium.org/p/chromium/issues/detail?id=761398#c4
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170749054
env_posix.cc and concurrent application calls to fflush(NULL).
The fix is to avoid using stdio in env_posix.cc but add our own
buffering where we need it.
Added a test to reproduce the bug.
Added a test for Env reads/writes.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170738066
12 lines above, there is an "if (!s.ok()) { return s; }" block of code.
"s" is never modified between that block and the "if" removed by this
CL, so "s.ok()" must be true.
The code most likely intended to say "if (!builder->ok())", because the
builder->Add() call above can modify the TableBuilder's status, as a
side-effect. However, this approach would have required setting "s =
builder.status()" in the "else" branch, near the "builder.Abandon()"
call. So, removing the "if" outright is simpler than following that line
of thought.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=167326229
An Android test was occasionally crashing with a SEGV in ConsumeDecimalNumber
Switching a local variable from an int to uint64_t eliminated these crashes.
Speculating this is either a compiler, runtime library, or emulator issue.
Switching this type to uint64_t also eliminates a compiler warning
about comparing an int with a uint64_t.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=166399695
When faced with a pointer that is misaligned by K bytes (pointer % 8 ==
K), the code previously moved forward by K bytes. In order to end up
with an aligned pointer, the code must move by 8 - K bytes.
This lands https://github.com/google/leveldb/pull/488
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=166295921
The dead code has been in the codebase since the initial commit and is
generating a compiler warning when used in Xcode.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=164174594
costan
MarcoFalke
Hyzeta
cmumford
sanjay
davidair