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1
2# (C) Copyright IBM Corporation 2004, 2005
3# (C) Copyright Apple Inc. 2011
4# Copyright (C) 2015 Intel Corporation
5# All Rights Reserved.
6#
7# Permission is hereby granted, free of charge, to any person obtaining a
8# copy of this software and associated documentation files (the "Software"),
9# to deal in the Software without restriction, including without limitation
10# on the rights to use, copy, modify, merge, publish, distribute, sub
11# license, and/or sell copies of the Software, and to permit persons to whom
12# the Software is furnished to do so, subject to the following conditions:
13#
14# The above copyright notice and this permission notice (including the next
15# paragraph) shall be included in all copies or substantial portions of the
16# Software.
17#
18# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
21# IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24# IN THE SOFTWARE.
25#
26# Authors:
27#    Jeremy Huddleston <jeremyhu@apple.com>
28#
29# Based on code ogiginally by:
30#    Ian Romanick <idr@us.ibm.com>
31
32import argparse
33
34import license
35import gl_XML, glX_XML
36
37header = """/* GLXEXT is the define used in the xserver when the GLX extension is being
38 * built.  Hijack this to determine whether this file is being built for the
39 * server or the client.
40 */
41#ifdef HAVE_DIX_CONFIG_H
42#include <dix-config.h>
43#endif
44
45#ifndef _WIN32
46#include <dlfcn.h>
47#endif
48#include <stdlib.h>
49#include <stdio.h>
50#include <string.h>
51
52#include "glapi.h"
53#include "glapitable.h"
54
55#ifdef GLXEXT
56#include "os.h"
57#endif
58
59static void
60__glapi_gentable_NoOp(void) {
61#if defined(GLXEXT)
62    LogMessage(X_ERROR, "GLX: Call to unimplemented API: Unknown\\n");
63#else
64    fprintf(stderr, "Call to unimplemented API: Unknown\\n");
65#endif
66}
67
68static void
69__glapi_gentable_set_remaining_noop(struct _glapi_table *disp) {
70    GLuint entries = _glapi_get_dispatch_table_size();
71    void **dispatch = (void **) disp;
72    unsigned i;
73
74    /* ISO C is annoying sometimes */
75    union {_glapi_proc p; void *v;} p;
76    p.p = __glapi_gentable_NoOp;
77
78    for(i=0; i < entries; i++)
79        if(dispatch[i] == NULL)
80            dispatch[i] = p.v;
81}
82
83"""
84
85footer = """
86struct _glapi_table *
87_glapi_create_table_from_handle(void *handle, const char *symbol_prefix) {
88    struct _glapi_table *disp = calloc(_glapi_get_dispatch_table_size(), sizeof(_glapi_proc));
89    char symboln[512];
90
91    if(!disp)
92        return NULL;
93
94    if(symbol_prefix == NULL)
95        symbol_prefix = "";
96
97    /* Note: This code relies on _glapi_table_func_names being sorted by the
98     * entry point index of each function.
99     */
100    for (int func_index = 0; func_index < GLAPI_TABLE_COUNT; ++func_index) {
101        const char *name = _glapi_table_func_names[func_index];
102        void ** procp = &((void **)disp)[func_index];
103
104        snprintf(symboln, sizeof(symboln), \"%s%s\", symbol_prefix, name);
105#ifdef _WIN32
106        *procp = GetProcAddress(handle, symboln);
107#else
108        *procp = dlsym(handle, symboln);
109#endif
110    }
111    __glapi_gentable_set_remaining_noop(disp);
112
113    return disp;
114}
115
116void
117 _glapi_table_patch(struct _glapi_table *table, const char *name, void *wrapper)
118{
119   for (int func_index = 0; func_index < GLAPI_TABLE_COUNT; ++func_index) {
120      if (!strcmp(_glapi_table_func_names[func_index], name)) {
121            ((void **)table)[func_index] = wrapper;
122            return;
123         }
124   }
125   fprintf(stderr, "could not patch %s in dispatch table\\n", name);
126}
127
128"""
129
130
131class PrintCode(gl_XML.gl_print_base):
132
133    def __init__(self):
134        gl_XML.gl_print_base.__init__(self)
135
136        self.name = "gl_gentable.py (from Mesa)"
137        self.license = license.bsd_license_template % ( \
138"""Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
139(C) Copyright IBM Corporation 2004, 2005
140(C) Copyright Apple Inc 2011""", "BRIAN PAUL, IBM")
141
142        return
143
144
145    def get_stack_size(self, f):
146        size = 0
147        for p in f.parameterIterator():
148            if p.is_padding:
149                continue
150
151            size += p.get_stack_size()
152
153        return size
154
155
156    def printRealHeader(self):
157        print(header)
158        return
159
160
161    def printRealFooter(self):
162        print(footer)
163        return
164
165
166    def printBody(self, api):
167
168        # Determine how many functions have a defined offset.
169        func_count = 0
170        for f in api.functions_by_name.values():
171            if f.offset != -1:
172                func_count += 1
173
174        # Build the mapping from offset to function name.
175        funcnames = [None] * func_count
176        for f in api.functions_by_name.values():
177            if f.offset != -1:
178                if not (funcnames[f.offset] is None):
179                    raise Exception("Function table has more than one function with same offset (offset %d, func %s)" % (f.offset, f.name))
180                funcnames[f.offset] = f.name
181
182        # Check that the table has no gaps.  We expect a function at every offset,
183        # and the code which generates the table relies on this.
184        for i in range(0, func_count):
185            if funcnames[i] is None:
186                raise Exception("Function table has no function at offset %d" % (i))
187
188        print("#define GLAPI_TABLE_COUNT %d" % func_count)
189        print("static const char * const _glapi_table_func_names[GLAPI_TABLE_COUNT] = {")
190        for i in range(0, func_count):
191            print("    /* %5d */ \"%s\"," % (i, funcnames[i]))
192        print("};")
193
194        return
195
196
197def _parser():
198    """Parse arguments and return a namespace object."""
199    parser = argparse.ArgumentParser()
200    parser.add_argument('-f',
201                        dest='filename',
202                        default='gl_API.xml',
203                        help='An XML file description of an API')
204
205    return parser.parse_args()
206
207
208def main():
209    """Main function."""
210    args = _parser()
211
212    printer = PrintCode()
213
214    api = gl_XML.parse_GL_API(args.filename, glX_XML.glx_item_factory())
215    printer.Print(api)
216
217
218if __name__ == '__main__':
219    main()
220