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#!/usr/bin/python
import os
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
# Generation occurs in three stages. In this case, it actually makes more
# sense to discuss them in the *opposite* order of that in which they
# actually happen.
#
# Stage 3 is to insert all of the generated code into a file, replacing the
# "#pragma generate" that's already there. The file can thus contain all
# sorts of stuff that's not specific to one fop, either before or after the
# generated code as appropriate.
#
# Stage 2 is to generate all of the code *for a particular fop*, using a
# string-valued template plus a table of substitution values. Most of these
# are built in to the generator itself. However, we also add a couple that
# are specific to this particular translator - LEN_CODE and SER_CODE. These
# are per-fop functions to get the length or the contents (respectively) of
# what we'll put in the log. As with stage 3 allowing per-file boilerplate
# before and after generated code, this allows per-fop boilerplate before and
# after generated code.
#
# Stage 1, therefore, is to create the LEN_CODE and SER_CODE substitutions for
# each fop, and put them in the same table where e.g. NAME and SHORT_ARGS
# already are. We do this by looking at the fop-description table in the
# generator module, then doing out own template substitution to plug each
# specific argument name into another string-valued template.
#
# So, what does this leave us with in terms of variables and files?
#
# For stage 1, we have a series of LEN_*_TEMPLATE and SERLZ_*_TEMPLATE
# strings, which are used to generate the length and serialization code for
# each argument type.
#
# For stage 2, we have a bunch of *_TEMPLATE strings (no LEN_ or SERLZ_
# prefix), which are used (along with the output from stage 1) to generate
# whole functions.
#
# For stage 3, we have a whole separate file (fdl_tmpl.c) into which we insert
# the collection of all functions defined in stage 2.
LEN_TEMPLATE = """
void
fdl_len_@NAME@ (call_stub_t *stub)
{
uint32_t meta_len = sizeof (event_header_t);
uint32_t data_len = 0;
/* TBD: global stuff, e.g. uid/gid */
@LEN_CODE@
/* TBD: pad extension length */
stub->jnl_meta_len = meta_len;
stub->jnl_data_len = data_len;
}
"""
SER_TEMPLATE = """
void
fdl_serialize_@NAME@ (call_stub_t *stub, char *meta_buf, char *data_buf)
{
event_header_t *eh;
unsigned long offset = 0;
/* TBD: word size/endianness */
eh = (event_header_t *)meta_buf;
eh->event_type = NEW_REQUEST;
eh->fop_type = GF_FOP_@UPNAME@;
eh->request_id = 0; // TBD
meta_buf += sizeof (*eh);
@SER_CODE@
/* TBD: pad extension length */
eh->ext_length = offset;
}
"""
CBK_TEMPLATE = """
int32_t
fdl_@NAME@_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno,
@LONG_ARGS@)
{
STACK_UNWIND_STRICT (@NAME@, frame, op_ret, op_errno,
@SHORT_ARGS@);
return 0;
}
"""
CONTINUE_TEMPLATE = """
int32_t
fdl_@NAME@_continue (call_frame_t *frame, xlator_t *this,
@LONG_ARGS@)
{
STACK_WIND (frame, fdl_@NAME@_cbk,
FIRST_CHILD(this), FIRST_CHILD(this)->fops->@NAME@,
@SHORT_ARGS@);
return 0;
}
"""
FOP_TEMPLATE = """
int32_t
fdl_@NAME@ (call_frame_t *frame, xlator_t *this,
@LONG_ARGS@)
{
call_stub_t *stub;
stub = fop_@NAME@_stub (frame, default_@NAME@,
@SHORT_ARGS@);
fdl_len_@NAME@ (stub);
stub->serialize = fdl_serialize_@NAME@;
fdl_enqueue (this, stub);
return 0;
}
"""
LEN_DICT_TEMPLATE = """
if (@SRC@) {
data_pair_t *memb;
for (memb = @SRC@->members_list; memb; memb = memb->next) {
meta_len += sizeof(int);
meta_len += strlen(memb->key) + 1;
meta_len += sizeof(int);
meta_len += memb->value->len;
}
}
meta_len += sizeof(int);
"""
LEN_GFID_TEMPLATE = """
meta_len += 16;
"""
LEN_INTEGER_TEMPLATE = """
meta_len += sizeof (@SRC@);
"""
# 16 for gfid, 16 for pargfid, 1 for flag, 0/1 for terminating NUL
LEN_LOC_TEMPLATE = """
if (@SRC@.name) {
meta_len += (strlen (@SRC@.name) + 34);
} else {
meta_len += 33;
}
"""
LEN_STRING_TEMPLATE = """
if (@SRC@) {
meta_len += (strlen (@SRC@) + 1);
} else {
meta_len += 1;
}
"""
LEN_VECTOR_TEMPLATE = """
meta_len += sizeof(size_t);
data_len += iov_length (@VEC@, @CNT@);
"""
LEN_IATT_TEMPLATE = """
meta_len += sizeof(@SRC@.ia_prot);
meta_len += sizeof(@SRC@.ia_uid);
meta_len += sizeof(@SRC@.ia_gid);
meta_len += sizeof(@SRC@.ia_atime);
meta_len += sizeof(@SRC@.ia_atime_nsec);
meta_len += sizeof(@SRC@.ia_mtime);
meta_len += sizeof(@SRC@.ia_mtime_nsec);
"""
SERLZ_DICT_TEMPLATE = """
if (@SRC@) {
data_pair_t *memb;
for (memb = @SRC@->members_list; memb; memb = memb->next) {
*((int *)(meta_buf+offset)) = strlen(memb->key) + 1;
offset += sizeof(int);
strcpy (meta_buf+offset, memb->key);
offset += strlen(memb->key) + 1;
*((int *)(meta_buf+offset)) = memb->value->len;
offset += sizeof(int);
memcpy (meta_buf+offset, memb->value->data, memb->value->len);
offset += memb->value->len;
}
}
*((int *)(meta_buf+offset)) = 0;
offset += sizeof(int);
"""
SERLZ_GFID_TEMPLATE = """
memcpy (meta_buf+offset, @SRC@->inode->gfid, 16);
offset += 16;
"""
SERLZ_INTEGER_TEMPLATE = """
memcpy (meta_buf+offset, &@SRC@, sizeof(@SRC@));
offset += sizeof(@SRC@);
"""
SERLZ_LOC_TEMPLATE = """
memcpy (meta_buf+offset, @SRC@.gfid, 16);
offset += 16;
memcpy (meta_buf+offset, @SRC@.pargfid, 16);
offset += 16;
if (@SRC@.name) {
*(meta_buf+offset) = 1;
++offset;
strcpy (meta_buf+offset, @SRC@.name);
offset += (strlen (@SRC@.name) + 1);
} else {
*(meta_buf+offset) = 0;
++offset;
}
"""
SERLZ_STRING_TEMPLATE = """
if (@SRC@) {
*(meta_buf+offset) = 1;
++offset;
strcpy (meta_buf+offset, @SRC@);
offset += strlen(@SRC@);
} else {
*(meta_buf+offset) = 0;
++offset;
}
"""
SERLZ_VECTOR_TEMPLATE = """
*((size_t *)(meta_buf+offset)) = iov_length (@VEC@, @CNT@);
offset += sizeof(size_t);
int32_t i;
for (i = 0; i < @CNT@; ++i) {
memcpy (data_buf, @VEC@[i].iov_base, @VEC@[i].iov_len);
data_buf += @VEC@[i].iov_len;
}
"""
# We don't need to save all of the fields - only those affected by chown,
# chgrp, chmod, and utime.
SERLZ_IATT_TEMPLATE = """
*((ia_prot_t *)(meta_buf+offset)) = @SRC@.ia_prot;
offset += sizeof(@SRC@.ia_prot);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_uid;
offset += sizeof(@SRC@.ia_uid);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_gid;
offset += sizeof(@SRC@.ia_gid);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_atime;
offset += sizeof(@SRC@.ia_atime);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_atime_nsec;
offset += sizeof(@SRC@.ia_atime_nsec);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_mtime;
offset += sizeof(@SRC@.ia_mtime);
*((uint32_t *)(meta_buf+offset)) = @SRC@.ia_mtime_nsec;
offset += sizeof(@SRC@.ia_mtime_nsec);
"""
typemap = {
'dict_t *': ( LEN_DICT_TEMPLATE, SERLZ_DICT_TEMPLATE),
'fd_t *': ( LEN_GFID_TEMPLATE, SERLZ_GFID_TEMPLATE),
'dev_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'gf_xattrop_flags_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'int32_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'mode_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'off_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'size_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'uint32_t': ( LEN_INTEGER_TEMPLATE, SERLZ_INTEGER_TEMPLATE),
'loc_t *': ( LEN_LOC_TEMPLATE, SERLZ_LOC_TEMPLATE),
'const char *': ( LEN_STRING_TEMPLATE, SERLZ_STRING_TEMPLATE),
'struct iatt *': ( LEN_IATT_TEMPLATE, SERLZ_IATT_TEMPLATE),
}
def get_special_subs (args):
len_code = ""
ser_code = ""
for arg in args:
if (arg[0] != 'fop-arg') or (len(arg) < 4):
continue
# Let this throw an exception if we get an unknown field name. The
# broken build will remind whoever messed with the stub code that a
# corresponding update is needed here.
if arg[3] == "vector":
# Make it as obvious as possible that this is a special case.
len_code += LEN_VECTOR_TEMPLATE \
.replace("@VEC@","stub->args.vector") \
.replace("@CNT@","stub->args.count")
ser_code += SERLZ_VECTOR_TEMPLATE \
.replace("@VEC@","stub->args.vector") \
.replace("@CNT@","stub->args.count")
else:
len_tmpl, ser_tmpl = typemap[arg[2]]
src = "stub->args.%s" % arg[3]
len_code += len_tmpl.replace("@SRC@",src)
ser_code += ser_tmpl.replace("@SRC@",src)
return len_code, ser_code
def gen_fdl ():
entrypoints = []
for name, value in ops.iteritems():
if "journal" not in [ x[0] for x in value ]:
continue
len_code, ser_code = get_special_subs(value)
fop_subs[name]["@LEN_CODE@"] = len_code[:-1]
fop_subs[name]["@SER_CODE@"] = ser_code[:-1]
print generate(LEN_TEMPLATE,name,fop_subs)
print generate(SER_TEMPLATE,name,fop_subs)
print generate(CBK_TEMPLATE,name,cbk_subs)
print generate(CONTINUE_TEMPLATE,name,fop_subs)
print generate(FOP_TEMPLATE,name,fop_subs)
entrypoints.append(name)
print "struct xlator_fops fops = {"
for ep in entrypoints:
print "\t.%s = fdl_%s," % (ep, ep)
print "};"
for l in open(sys.argv[1],'r').readlines():
if l.find('#pragma generate') != -1:
print "/* BEGIN GENERATED CODE - DO NOT MODIFY */"
gen_fdl()
print "/* END GENERATED CODE */"
else:
print l[:-1]
|
