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#!/usr/bin/python3
from __future__ import print_function
import os
import re
import sys
curdir = os.path.dirname (sys.argv[0])
gendir = os.path.join (curdir, '../../../../libglusterfs/src')
sys.path.append (gendir)
from generator import ops, fop_subs, cbk_subs, generate
# See the big header comment at the start of gen_fdl.py to see how the stages
# fit together. The big difference here is that *all* of the C code is in the
# template file as labelled fragments, instead of as Python strings. That
# makes it much easier to edit in one place, with proper syntax highlighting
# and indentation.
#
# Stage 1 uses type-specific fragments to generate FUNCTION_BODY, instead of
# LEN_*_TEMPLATE and SERLZ_*_TEMPLATE to generate LEN_CODE and SER_CODE.
#
# Stage 2 uses the FOP and CASE fragments instead of RECON_TEMPLATE and
# FOP_TEMPLATE. The expanded FOP code (including FUNCTION_BODY substitution
# in the middle of each function) is emitted immediately; the expanded CASE
# code is saved for the next stage.
#
# Stage 3 uses the PROLOG and EPILOG fragments, with the expanded CASE code
# in the middle of EPILOG, to generate the whole output file.
#
# Another way of looking at it is to consider how the fragments appear in
# the final output:
#
# PROLOG
# FOP (expanded for CREATE)
# FOP before FUNCTION_BODY
# LOC, INTEGER, GFID, etc. (one per arg, by type)
# FOP after FUNCTION_BODY
# FOP (expanded for WRITEV)
# FOP before FUNCTION_BODY
# GFID, VECTOR, etc. (on per arg, by type)
# FOP after FUNCTION_BODY
# (more FOPs)
# EPILOG
# EPILOG before CASE
# CASE statements (one per fop)
# EPILOG after CASE
typemap = {
'dict_t *': ( "DICT", ""),
'fd_t *': ( "GFID", ""),
'dev_t': ( "DOUBLE", "%ld (0x%lx)"),
'gf_xattrop_flags_t': ( "INTEGER", "%d (0x%x)"),
'int32_t': ( "INTEGER", "%d (0x%x)"),
'mode_t': ( "INTEGER", "%d (0x%x)"),
'off_t': ( "DOUBLE", "%ld (0x%lx)"),
'size_t': ( "DOUBLE", "%ld (0x%lx)"),
'uint32_t': ( "INTEGER", "%d (0x%x)"),
'loc_t *': ( "LOC", ""),
'const char *': ( "STRING", ""),
'struct iovec *': ( "VECTOR", ""),
'struct iatt *': ( "IATT", ""),
}
def get_special_subs (args):
code = ""
for arg in args:
if (arg[0] != 'fop-arg') or (len(arg) < 4):
continue
recon_type, recon_fmt = typemap[arg[2]]
code += fragments[recon_type].replace("@ARGNAME@", arg[3]) \
.replace("@FORMAT@", recon_fmt)
return code
def gen_functions ():
code = ""
for name, value in ops.items():
if "journal" not in [ x[0] for x in value ]:
continue
fop_subs[name]["@FUNCTION_BODY@"] = get_special_subs(value)
# Print the FOP fragment with @FUNCTION_BODY@ in the middle.
code += generate(fragments["FOP"], name, fop_subs)
return code
def gen_cases ():
code = ""
for name, value in ops.items():
if "journal" not in [ x[0] for x in value ]:
continue
# Add the CASE fragment for this fop.
code += generate(fragments["CASE"], name, fop_subs)
return code
def load_fragments (path="recon-tmpl.c"):
pragma_re = re.compile('pragma fragment (.*)')
cur_symbol = None
cur_value = ""
result = {}
for line in open(path, "r").readlines():
m = pragma_re.search(line)
if m:
if cur_symbol:
result[cur_symbol] = cur_value
cur_symbol = m.group(1)
cur_value = ""
else:
cur_value += line
if cur_symbol:
result[cur_symbol] = cur_value
return result
if __name__ == "__main__":
fragments = load_fragments(sys.argv[1])
print("/* BEGIN GENERATED CODE - DO NOT MODIFY */")
print(fragments["PROLOG"])
print(gen_functions())
print(fragments["EPILOG"].replace("@SWITCH_BODY@", gen_cases()))
print("/* END GENERATED CODE */")
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