linkage.c revision 2775:892d346f56a9 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1997-1999 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29
30#include <stdio.h>
31#include <unistd.h>
32#include <sys/types.h>
33#include "parser.h"
34#include "trace.h"
35#include "util.h"
36#include "db.h"
37#include "symtab.h"
38#include "io.h"
39#include "printfuncs.h"
40#include "errlog.h"
41#include "parseproto.h"
42
43static void generate_interface_predeclaration(char *, ENTRY *);
44static void generate_linkage_function(char *, char *);
45
46
47/*
48 * generate_linkage -- make code for the linkage part of an individual
49 *	interface. Assumes Bodyfp.
50 */
51void
52generate_linkage(ENTRY *function)
53{
54	char	*library_name = db_get_current_library(),
55		*function_name;
56	char	composite_name[MAXLINE];
57
58	errlog(BEGIN, "generate_linkage() {");
59
60	function_name = name_of(function);
61	(void) snprintf(composite_name, sizeof (composite_name),
62		"%s_%s", library_name, function_name);
63
64	/* Print the predeclaration of the interceptor. */
65	generate_interface_predeclaration(composite_name, function);
66	/* Collect things we'll use more than once. */
67
68	/* Next the struct used to pass parameters. */
69	(void) fprintf(Bodyfp, "static abisym_t __abi_%s_%s_sym;\n",
70		library_name, function_name);
71
72	/* The linkage function, */
73	generate_linkage_function(library_name, function_name);
74
75	(void) fputs("\n\n", Bodyfp);
76	errlog(END, "}");
77}
78
79
80/*
81 *  generate_interface_predeclaration -- make things know so the compiler
82 *	won't kak.
83 */
84static void
85generate_interface_predeclaration(char *composite_name, ENTRY *function)
86{
87	decl_t *pp;
88	char *p = symtab_get_prototype();
89	char buf[BUFSIZ];
90
91	(void) fprintf(Bodyfp, "\n/* from \"%s\", line %d */\n",
92		symtab_get_filename(), line_of(function));
93	(void) fprintf(Bodyfp, "static ");
94
95	if (p[strlen(p)-1] != ';')
96		(void) snprintf(buf, BUFSIZ, "%s;", strnormalize(p));
97	else
98		(void) snprintf(buf, BUFSIZ, "%s", strnormalize(p));
99
100	decl_Parse(buf, &pp);
101	decl_AddArgNames(pp);
102	symtab_set_prototype(decl_ToString(buf, DTS_DECL, pp, composite_name));
103	(void) fprintf(Bodyfp, "%s;\n", symtab_get_prototype());
104	decl_Destroy(pp);
105}
106
107
108
109/*
110 * generate_linkage_function --  The linkage function itself.
111 */
112static void
113generate_linkage_function(char *lib, char *func)
114{
115	(void) fprintf(Bodyfp,
116	    "void *__abi_%s_%s(void *real, int vflag) { \n", lib, func);
117	(void) fprintf(Bodyfp, "    ABI_REAL(%s, %s) = real;\n", lib, func);
118	(void) fprintf(Bodyfp, "    ABI_VFLAG(%s, %s) = vflag;\n", lib, func);
119	(void) fprintf(Bodyfp,
120	    "    return ((void *) %s_%s);\n}\n", lib, func);
121}
122