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# Reply server mig-output massager
#
# Copyright (C) 1995-2022 Free Software Foundation, Inc.
#
# Written by Miles Bader <miles@gnu.ai.mit.edu>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This awk script hacks the output of mig-generated reply server code
# so that it allows replies with just the error-code in them (as this is
# how mig returns errors).
#
# It is highly, highly, dependent on the exact format of mig output. Ick.
#
BEGIN { parse_phase = 0; }
/^}/ { parse_phase = 0; }
parse_phase == 0 && /^mig_internal void _X[a-zA-Z0-9_]*_reply/ {
# The start of a mig server routine. Reset everything. Note that we only
# mess with rpcs that have the suffix `_reply'.
num_args = 0;
num_checks = 0;
parse_phase = 1;
print; next;
}
parse_phase == 1 && /^[\t ]*typedef struct/ {
# The first structure in the server routine should describe the arguments
parse_phase = 2;
print; next;
}
parse_phase == 2 {
# The message header field in the args structure, which skip.
parse_phase = 3;
print; next;
}
parse_phase == 3 && /} Request/ {
# The args structure is over.
if (num_args > 1)
parse_phase = 5;
else
# There's no extra args that could screw up the normal mechanism for
# error returns, so we don't have to insert any new code.
parse_phase = 0;
print; next;
}
parse_phase == 3 && num_args == 0 {
# The type field for an argument.
# This won't be accurate in case of unions being used in the Request struct,
# but that doesn't matter, as we'll only be looking at arg_type_code_name[0],
# which will not be a union type.
arg_type_code_name[num_args] = $2;
sub (/;$/, "", arg_type_code_name[num_args]) # Get rid of the semi-colon
parse_phase = 4;
print; next;
}
parse_phase == 3 && num_args == 1 {
# We've got more than one argument (but we don't care what it is).
num_args++;
print; next;
}
parse_phase == 3 {
# We've know everything we need; now just wait for the end of the Request
# struct.
print; next;
}
parse_phase == 4 {
# The value field for an argument.
# This won't be accurate in case of unions being used in the Request struct,
# but that doesn't matter, as we'll only be looking at arg_name[0], which
# will not be a union type.
arg_name[num_args] = $2;
sub (/;$/, "", arg_name[num_args]) # Get rid of the semi-colon
num_args++;
parse_phase = 3;
print; next;
}
parse_phase == 5 && /^[ \t]*(auto |static )?const mach_msg_type_t/ {
# The type check structure for an argument.
arg_check_name[num_checks] = $(NF - 2);
num_checks++;
print; next;
}
parse_phase == 5 && /^[ \t]*mig_external kern_return_t/ {
# The declaration of the user server function for this rpc.
user_function_name = $3;
print; next;
}
parse_phase == 5 && /^#if[ \t]TypeCheck/ {
# Keep going if we have not yet collected the type check structures.
if (num_checks == 0)
{
print; next;
}
# The first args type checking statement; we need to insert our chunk of
# code that bypasses all the type checks if this is an error return, after
# which we're done until we get to the next function. Handily, the size
# of mig's Reply structure is also the size of the alternate Request
# structure that we want to check for.
print "\tif (In0P->Head.msgh_size == sizeof (Reply)";
print "\t && ! (In0P->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX)";
print "\t && ! BAD_TYPECHECK(&In0P->" arg_type_code_name[0] ", &" arg_check_name[0] ")";
print "\t && In0P->" arg_name[0] " != 0)";
print "\t /* Error return, only the error code argument is passed. */";
print "\t {";
# Force the function user_function_name into a type that only takes the first
# two arguments.
# This is possibly bogus, but easier than supplying bogus values for all
# the other args (we can't just pass 0 for them, as they might not be scalar).
print "\t void * __error_call = " user_function_name ";";
print "\t OutP->RetCode = (*(kern_return_t (*)(mach_port_t, kern_return_t)) __error_call) (In0P->Head.msgh_request_port, In0P->" arg_name[0] ");";
print "\t return;";
print "\t }";
print "";
parse_phase = 0;
print; next;
}
{ print; }
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