1 # Reply server mig-output massager
3 # Copyright (C) 1995-2014 Free Software Foundation, Inc.
5 # Written by Miles Bader <miles@gnu.ai.mit.edu>
7 # This program is free software; you can redistribute it and/or
8 # modify it under the terms of the GNU General Public License as
9 # published by the Free Software Foundation; either version 3, or (at
10 # your option) any later version.
12 # This program is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 # General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
20 # This awk script hacks the output of mig-generated reply server code
21 # so that it allows replies with just the error-code in them (as this is
22 # how mig returns errors).
24 # It is highly, highly, dependent on the exact format of mig output. Ick.
27 BEGIN { parse_phase = 0; }
29 /^}/ { parse_phase = 0; }
31 parse_phase == 0 && /^mig_internal void _X[a-zA-Z0-9_]*_reply/ {
32 # The start of a mig server routine. Reset everything. Note that we only
33 # mess with rpcs that have the suffix `_reply'.
40 parse_phase == 1 && /^[\t ]*typedef struct/ {
41 # The first structure in the server routine should describe the arguments
47 # The message header field in the args structure, which skip.
52 parse_phase == 3 && /}/ {
53 # The args structure is over.
57 # There's no extra args that could screw up the normal mechanism for
58 # error returns, so we don't have to insert any new code.
64 # The type field for an argument.
65 arg_type_code_name[num_args] = $2;
66 sub (/;$/, "", arg_type_code_name[num_args]) # Get rid of the semi-colon
72 # The value field for an argument.
73 arg_name[num_args] = $2;
74 sub (/;$/, "", arg_name[num_args]) # Get rid of the semi-colon
75 arg_type[num_args] = $1;
81 parse_phase == 5 && /^[ \t]*(auto |static |)const mach_msg_type_t/ {
82 # The type check structure for an argument.
83 arg_check_name[num_checks] = $(NF - 2);
88 parse_phase == 5 && /^[ \t]*mig_external kern_return_t/ {
89 # The declaration of the user server function for this rpc.
90 user_function_name = $3;
94 parse_phase == 5 && /^#if[ \t]TypeCheck/ {
95 # The first args type checking statement; we need to insert our chunk of
96 # code that bypasses all the type checks if this is an error return, after
97 # which we're done until we get to the next function. Handily, the size
98 # of mig's Reply structure is also the size of the alternate Request
99 # structure that we want to check for.
100 print "\tif (In0P->Head.msgh_size == sizeof (Reply)";
101 print "\t && ! (In0P->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX)";
102 print "\t && ! BAD_TYPECHECK(&In0P->" arg_type_code_name[0] ", &" arg_check_name[0] ")";
103 print "\t && In0P->" arg_name[0] " != 0)";
104 print "\t /* Error return, only the error code argument is passed. */";
106 # Force the function into a type that only takes the first two args, via
107 # the temp variable SFUN (is there another way to correctly do this cast?).
108 # This is possibly bogus, but easier than supplying bogus values for all
109 # the other args (we can't just pass 0 for them, as they might not be scalar).
110 printf ("\t kern_return_t (*sfun)(mach_port_t");
111 for (i = 0; i < num_args; i++)
112 printf (", %s", arg_type[i]);
113 printf (") = %s;\n", user_function_name);
114 print "\t OutP->RetCode = (*(kern_return_t (*)(mach_port_t, kern_return_t))sfun) (In0P->Head.msgh_request_port, In0P->" arg_name[0] ");";