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Add and fix clang -Wshift-sign-overflow (#7431)

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Summary:
This option is apparently used by some teams within Facebook
(internal ref T75998621)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7431

Test Plan: USE_CLANG=1 make check before (fails) and after

Reviewed By: jay-zhuang

Differential Revision: D23876584

Pulled By: pdillinger

fbshipit-source-id: abb8b67a1f1aac75327944d266e284b2b6727191
This commit is contained in:
Peter Dillinger 2020-09-23 15:24:57 -07:00
parent 74be8f3ea2
commit e041a40a23
3 changed files with 16 additions and 11 deletions
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5
Makefile
View file

@ -421,6 +421,11 @@ default: all
WARNING_FLAGS = -W -Wextra -Wall -Wsign-compare -Wshadow \
-Wunused-parameter
ifdef USE_CLANG
# Used by some teams in Facebook
WARNING_FLAGS += -Wshift-sign-overflow
endif
ifeq ($(PLATFORM), OS_OPENBSD)
WARNING_FLAGS += -Wno-unused-lambda-capture
endif

2
db/write_batch_test.cc
View file

@ -419,7 +419,7 @@ TEST_F(WriteBatchTest, PrepareCommit) {
TEST_F(WriteBatchTest, DISABLED_ManyUpdates) {
// Insert key and value of 3GB and push total batch size to 12GB.
static const size_t kKeyValueSize = 4u;
static const uint32_t kNumUpdates = uint32_t(3 << 30);
static const uint32_t kNumUpdates = uint32_t{3} << 30;
std::string raw(kKeyValueSize, 'A');
WriteBatch batch(kNumUpdates * (4 + kKeyValueSize * 2) + 1024u);
char c = 'A';

20
include/rocksdb/utilities/backupable_db.h
View file

@ -129,7 +129,7 @@ struct BackupableDBOptions {
// table file names when the table files are stored in the shared_checksum
// directory (i.e., both share_table_files and share_files_with_checksum
// are true).
enum ShareFilesNaming : int {
enum ShareFilesNaming : uint32_t {
// Backup SST filenames are <file_number>_<crc32c>_<file_size>.sst
// where <crc32c> is an unsigned decimal integer. This is the
// original/legacy naming scheme for share_files_with_checksum,
@ -140,7 +140,7 @@ struct BackupableDBOptions {
// so generally requires reading the whole file even if the file
// is already backed up.
// ** ONLY RECOMMENDED FOR PRESERVING OLD BEHAVIOR **
kLegacyCrc32cAndFileSize = 1,
kLegacyCrc32cAndFileSize = 1U,
// Backup SST filenames are <file_number>_s<db_session_id>.sst. This
// pair of values should be very strongly unique for a given SST file
@ -152,9 +152,9 @@ struct BackupableDBOptions {
// will be used instead, matching the names assigned by RocksDB versions
// not supporting the newer naming scheme.
// * See also flags below.
kUseDbSessionId = 2,
kUseDbSessionId = 2U,
kMaskNoNamingFlags = 0xffff,
kMaskNoNamingFlags = 0xffffU,
// If not already part of the naming scheme, insert
// _<file_size>
@ -165,7 +165,7 @@ struct BackupableDBOptions {
//
// We do not consider SST file sizes to have sufficient entropy to
// contribute significantly to naming uniqueness.
kFlagIncludeFileSize = 1 << 31,
kFlagIncludeFileSize = 1U << 31,
// When encountering an SST file from a Facebook-internal early
// release of 6.12, use the default naming scheme in effect for
@ -175,7 +175,7 @@ struct BackupableDBOptions {
// and ignores kFlagIncludeFileSize setting.
// NOTE: This flag is intended to be temporary and should be removed
// in a later release.
kFlagMatchInterimNaming = 1 << 30,
kFlagMatchInterimNaming = 1U << 30,
kMaskNamingFlags = ~kMaskNoNamingFlags,
};
@ -234,8 +234,8 @@ struct BackupableDBOptions {
inline BackupableDBOptions::ShareFilesNaming operator&(
BackupableDBOptions::ShareFilesNaming lhs,
BackupableDBOptions::ShareFilesNaming rhs) {
int l = static_cast<int>(lhs);
int r = static_cast<int>(rhs);
uint32_t l = static_cast<uint32_t>(lhs);
uint32_t r = static_cast<uint32_t>(rhs);
assert(r == BackupableDBOptions::kMaskNoNamingFlags ||
(r & BackupableDBOptions::kMaskNoNamingFlags) == 0);
return static_cast<BackupableDBOptions::ShareFilesNaming>(l & r);
@ -244,8 +244,8 @@ inline BackupableDBOptions::ShareFilesNaming operator&(
inline BackupableDBOptions::ShareFilesNaming operator|(
BackupableDBOptions::ShareFilesNaming lhs,
BackupableDBOptions::ShareFilesNaming rhs) {
int l = static_cast<int>(lhs);
int r = static_cast<int>(rhs);
uint32_t l = static_cast<uint32_t>(lhs);
uint32_t r = static_cast<uint32_t>(rhs);
assert((r & BackupableDBOptions::kMaskNoNamingFlags) == 0);
return static_cast<BackupableDBOptions::ShareFilesNaming>(l | r);
}