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authorLuca Barbieri <luca@luca-barbieri.com>2010-04-01 18:40:27 +0200
committerLuca Barbieri <luca@luca-barbieri.com>2010-04-01 18:52:02 +0200
commit4edffe026e387f6a038d7538577bf5ecc168f223 (patch)
tree7d0d21765a5ceea2aa3f2fbf20f6ae0957cba41e /src/gallium/auxiliary/util/u_init.h
parent8f38135e283a0e81510fb40fb9e0c918436fa5f1 (diff)
gallium/util: rewrite global constructor system for half floats (GCC/MSVC only!)
NOTE: this commit will cause Gallium to fail to build on any compiler except GCC, the Microsoft C compiler and compatible compilers that claim to be one of those. This commit removes the u_gctors.cpp mechanism, in favor of using compiler-specific syntax to add global constructors from C files. This solves the problem of u_gctors.o not being pulled from static libraries and avoids using C++. However, it needs compiler-specific support for every compiler. The Microsoft C compiler support has not been tested.
Diffstat (limited to 'src/gallium/auxiliary/util/u_init.h')
-rw-r--r--src/gallium/auxiliary/util/u_init.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_init.h b/src/gallium/auxiliary/util/u_init.h
new file mode 100644
index 0000000000..edbcf2dcb9
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_init.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2010 Luca Barbieri
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#ifndef U_INIT_H
+#define U_INIT_H
+
+/* Use UTIL_INIT(f) to have f called at program initialization.
+ Note that it is only guaranteed to be called if any symbol in the
+ .c file it is in sis referenced by the program.
+
+ UTIL_INIT functions are called in arbitrary order.
+*/
+
+#ifdef __cplusplus
+/* use a C++ global constructor */
+#define UTIL_INIT(f) struct f##__gctor_t {f##__gctor_t() {x();}} f##__gctor;
+#elif defined(_MSC_VER)
+/* add a pointer to the section where MSVC stores global constructor pointers */
+/* see http://blogs.msdn.com/vcblog/archive/2006/10/20/crt-initialization.aspx and
+ http://stackoverflow.com/questions/1113409/attribute-constructor-equivalent-in-vc */
+#define UTIL_INIT(f) static void __cdecl f##__init(void) {f();}; __declspec(allocate(".CRT$XCU")) void (__cdecl* f##__xcu)(void) = f##__init;
+#elif defined(__GNUC__)
+#define UTIL_INIT(f) static void f##__init(void) __attribute__((constructor)); static void f##__init(void) {f();}
+#else
+#error Unsupported compiler: please find out how to implement global initializers in C on it
+#endif
+
+#endif
+