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# Output a C header file using the minimum number of distinct bits to ensure
# flags don't collide.
import os, re, sys
from dist import compare_srcfile
flags = {
###################################################
# Internal routine flag declarations
###################################################
'cache_flush' : [
'SYNC_CHECKPOINT',
'SYNC_CLOSE',
'SYNC_DISCARD',
'SYNC_DISCARD_FORCE',
'SYNC_WRITE_LEAVES',
],
'file_types' : [
'FILE_TYPE_CHECKPOINT',
'FILE_TYPE_DATA',
'FILE_TYPE_DIRECTORY',
'FILE_TYPE_LOG',
'FILE_TYPE_TURTLE',
],
'log_scan' : [
'LOGSCAN_FIRST',
'LOGSCAN_FROM_CKP',
'LOGSCAN_ONE',
'LOGSCAN_RECOVER',
],
'log_write' : [
'LOG_BACKGROUND',
'LOG_DSYNC',
'LOG_FLUSH',
'LOG_FSYNC',
],
'page_read' : [
'READ_CACHE',
'READ_COMPACT',
'READ_NO_EVICT',
'READ_NO_GEN',
'READ_NO_WAIT',
'READ_PREV',
'READ_SKIP_INTL',
'READ_TRUNCATE',
'READ_WONT_NEED',
],
'rec_write' : [
'EVICT_LOOKASIDE',
'EVICTING',
'EVICT_UPDATE_RESTORE',
'VISIBILITY_ERR',
],
'txn_log_checkpoint' : [
'TXN_LOG_CKPT_CLEANUP',
'TXN_LOG_CKPT_PREPARE',
'TXN_LOG_CKPT_START',
'TXN_LOG_CKPT_STOP',
'TXN_LOG_CKPT_SYNC',
],
'verbose' : [
'VERB_API',
'VERB_BLOCK',
'VERB_CHECKPOINT',
'VERB_COMPACT',
'VERB_EVICT',
'VERB_EVICTSERVER',
'VERB_FILEOPS',
'VERB_LOG',
'VERB_LSM',
'VERB_LSM_MANAGER',
'VERB_METADATA',
'VERB_MUTEX',
'VERB_OVERFLOW',
'VERB_READ',
'VERB_RECONCILE',
'VERB_RECOVERY',
'VERB_SALVAGE',
'VERB_SHARED_CACHE',
'VERB_SPLIT',
'VERB_TEMPORARY',
'VERB_TRANSACTION',
'VERB_VERIFY',
'VERB_VERSION',
'VERB_WRITE',
],
###################################################
# Structure flag declarations
###################################################
'conn' : [
'CONN_CACHE_POOL',
'CONN_CKPT_SYNC',
'CONN_CLOSING',
'CONN_EVICTION_RUN',
'CONN_LEAK_MEMORY',
'CONN_LOG_SERVER_RUN',
'CONN_LSM_MERGE',
'CONN_PANIC',
'CONN_SERVER_ASYNC',
'CONN_SERVER_CHECKPOINT',
'CONN_SERVER_LSM',
'CONN_SERVER_RUN',
'CONN_SERVER_STATISTICS',
'CONN_SERVER_SWEEP',
'CONN_WAS_BACKUP',
],
'session' : [
'SESSION_CAN_WAIT',
'SESSION_CLEAR_EVICT_WALK',
'SESSION_INTERNAL',
'SESSION_LOCKED_CHECKPOINT',
'SESSION_LOCKED_HANDLE_LIST',
'SESSION_LOCKED_SCHEMA',
'SESSION_LOCKED_TABLE',
'SESSION_LOGGING_INMEM',
'SESSION_LOOKASIDE_CURSOR',
'SESSION_NO_CACHE',
'SESSION_NO_DATA_HANDLES',
'SESSION_NO_EVICTION',
'SESSION_NO_LOGGING',
'SESSION_NO_SCHEMA_LOCK',
'SESSION_SALVAGE_CORRUPT_OK',
'SESSION_SERVER_ASYNC',
],
}
flag_cnt = {} # Dictionary [flag] : [reference count]
flag_name = {} # Dictionary [flag] : [name ...]
name_mask = {} # Dictionary [name] : [used flag mask]
# Step through the flags dictionary and build our local dictionaries.
for method in flags.items():
name_mask[method[0]] = 0x0
for flag in method[1]:
if flag == '__NONE__':
continue
if flag not in flag_cnt:
flag_cnt[flag] = 1
flag_name[flag] = []
else:
flag_cnt[flag] += 1
flag_name[flag].append(method[0])
# Create list of possible bit masks.
bits = [2 ** i for i in range(0, 32)]
# Walk the list of flags in reverse, sorted-by-reference count order. For
# each flag, find a bit that's not currently in use by any method using the
# flag.
flag_bit = {} # Dictionary [flag] : [bit value]
for f in sorted(flag_cnt.items(), key = lambda k_v : (-k_v[1], k_v[0])):
mask = 0xffffffff
for m in flag_name[f[0]]:
mask &= ~name_mask[m]
if mask == 0:
print >>sys.stderr,\
"flags.py: ran out of flags at " + m + " method",
sys.exit(1)
for b in bits:
if mask & b:
mask = b
break
flag_bit[f[0]] = mask
for m in flag_name[f[0]]:
name_mask[m] |= mask
# Print out the flag masks in hex.
# Assumes tab stops set to 8 characters.
flag_info = ''
for f in sorted(flag_cnt.items()):
flag_info += "#define\tWT_%s%s%#010x\n" %\
(f[0],\
"\t" * max(1, 6 - int((len('WT_') + len(f[0])) / 8)),\
flag_bit[f[0]])
# Update the wiredtiger.in file with the flags information.
tmp_file = '__tmp'
tfile = open(tmp_file, 'w')
skip = 0
for line in open('../src/include/flags.h', 'r'):
if skip:
if line.count('flags section: END'):
tfile.write('/*\n' + line)
skip = 0
else:
tfile.write(line)
if line.count('flags section: BEGIN'):
skip = 1
tfile.write(' */\n')
tfile.write(flag_info)
tfile.close()
compare_srcfile(tmp_file, '../src/include/flags.h')
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