1 ##########################################################################
3 # Copyright 2008-2010 VMware, Inc.
6 # Permission is hereby granted, free of charge, to any person obtaining a copy
7 # of this software and associated documentation files (the "Software"), to deal
8 # in the Software without restriction, including without limitation the rights
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10 # copies of the Software, and to permit persons to whom the Software is
11 # furnished to do so, subject to the following conditions:
13 # The above copyright notice and this permission notice shall be included in
14 # all copies or substantial portions of the Software.
16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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24 ##########################################################################/
27 """GLX tracing generator."""
30 from stdapi import API
31 from glapi import glapi
32 from glxapi import glxapi
33 from gltrace import GlTracer
34 from dispatch import function_pointer_type, function_pointer_value
37 class GlxTracer(GlTracer):
39 def get_function_address(self, function):
40 return '__%s' % (function.name,)
42 def wrap_ret(self, function, instance):
43 if function.name in ("glXGetProcAddress", "glXGetProcAddressARB"):
44 print ' %s = __unwrap_proc_addr(procName, %s);' % (instance, instance)
47 if __name__ == '__main__':
49 print '#include <stdlib.h>'
50 print '#include <string.h>'
52 print '#ifndef _GNU_SOURCE'
53 print '#define _GNU_SOURCE // for dladdr'
55 print '#include <dlfcn.h>'
57 print '#include "trace_write.hpp"'
59 print '#include "glproc.hpp"'
60 print '#include "glsize.hpp"'
64 print 'static __GLXextFuncPtr __unwrap_proc_addr(const GLubyte * procName, __GLXextFuncPtr procPtr);'
73 print 'static __GLXextFuncPtr __unwrap_proc_addr(const GLubyte * procName, __GLXextFuncPtr procPtr) {'
74 print ' if (!procPtr) {'
75 print ' return procPtr;'
77 for f in api.functions:
78 ptype = function_pointer_type(f)
79 pvalue = function_pointer_value(f)
80 print ' if (!strcmp("%s", (const char *)procName)) {' % f.name
81 print ' %s = (%s)procPtr;' % (pvalue, ptype)
82 print ' return (__GLXextFuncPtr)&%s;' % (f.name,)
84 print ' return procPtr;'
90 static void *libgl_handle = NULL;
94 * Invoke the true dlopen() function.
96 static void *__dlopen(const char *filename, int flag)
98 typedef void * (*PFNDLOPEN)(const char *, int);
99 static PFNDLOPEN dlopen_ptr = NULL;
102 dlopen_ptr = (PFNDLOPEN)dlsym(RTLD_NEXT, "dlopen");
104 OS::DebugMessage("error: dlsym(RTLD_NEXT, \"dlopen\") failed\n");
109 return dlopen_ptr(filename, flag);
114 * Several applications, such as Quake3, use dlopen("libGL.so.1"), but
115 * LD_PRELOAD does not intercept symbols obtained via dlopen/dlsym, therefore
116 * we need to intercept the dlopen() call here, and redirect to our wrapper
119 void *dlopen(const char *filename, int flag)
123 handle = __dlopen(filename, flag);
125 if (filename && handle) {
127 OS::DebugMessage("warning: dlopen(\"%s\", 0x%x)\n", filename, flag);
130 // FIXME: handle absolute paths and other versions
131 if (strcmp(filename, "libGL.so") == 0 ||
132 strcmp(filename, "libGL.so.1") == 0) {
133 // Use the true libGL.so handle instead of RTLD_NEXT from now on
134 libgl_handle = handle;
136 // Get the file path for our shared object, and use it instead
137 static int dummy = 0xdeedbeef;
139 if (dladdr(&dummy, &info)) {
140 OS::DebugMessage("apitrace: redirecting dlopen(\"%s\", 0x%x)\n", filename, flag);
141 handle = __dlopen(info.dli_fname, flag);
143 OS::DebugMessage("warning: dladdr() failed\n");
155 * Lookup a libGL symbol
157 static void * __dlsym(const char *symbol)
163 * Try to use whatever libGL.so the library is linked against.
165 result = dlsym(RTLD_NEXT, symbol);
167 libgl_handle = RTLD_NEXT;
172 * The app doesn't directly link against libGL.so, nor does it directly
173 * dlopen it. So we have to load it ourselves.
175 libgl_handle = __dlopen("libGL.so", RTLD_LAZY | RTLD_LOCAL);
177 OS::DebugMessage("error: couldn't find libGL.so\n");
182 return dlsym(libgl_handle, symbol);