From 4edffe026e387f6a038d7538577bf5ecc168f223 Mon Sep 17 00:00:00 2001 From: Luca Barbieri Date: Thu, 1 Apr 2010 18:40:27 +0200 Subject: 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. --- src/gallium/auxiliary/Makefile | 3 -- src/gallium/auxiliary/util/u_gctors.cpp | 17 ----------- src/gallium/auxiliary/util/u_half.c | 5 +++- src/gallium/auxiliary/util/u_half.h | 5 ---- src/gallium/auxiliary/util/u_init.h | 51 +++++++++++++++++++++++++++++++++ 5 files changed, 55 insertions(+), 26 deletions(-) delete mode 100644 src/gallium/auxiliary/util/u_gctors.cpp create mode 100644 src/gallium/auxiliary/util/u_init.h (limited to 'src/gallium') diff --git a/src/gallium/auxiliary/Makefile b/src/gallium/auxiliary/Makefile index 14c0fb1840..1db4aaa439 100644 --- a/src/gallium/auxiliary/Makefile +++ b/src/gallium/auxiliary/Makefile @@ -139,9 +139,6 @@ C_SOURCES = \ #vl/vl_csc.c \ #vl/vl_shader_build.c \ -CPP_SOURCES = \ - util/u_gctors.cpp - GALLIVM_SOURCES = \ gallivm/lp_bld_alpha.c \ gallivm/lp_bld_arit.c \ diff --git a/src/gallium/auxiliary/util/u_gctors.cpp b/src/gallium/auxiliary/util/u_gctors.cpp deleted file mode 100644 index 3d2dc5b7ad..0000000000 --- a/src/gallium/auxiliary/util/u_gctors.cpp +++ /dev/null @@ -1,17 +0,0 @@ -/* this file uses the C++ global constructor mechanism to automatically - initialize global data - - __attribute__((constructor)) allows to do this in C, but is GCC-only -*/ - -#include "u_half.h" - -struct util_gctor_t -{ - util_gctor_t() - { - util_half_init_tables(); - } -}; - -static struct util_gctor_t util_gctor; diff --git a/src/gallium/auxiliary/util/u_half.c b/src/gallium/auxiliary/util/u_half.c index 525ee7b1ec..4611b201b9 100644 --- a/src/gallium/auxiliary/util/u_half.c +++ b/src/gallium/auxiliary/util/u_half.c @@ -50,6 +50,7 @@ */ #include "util/u_half.h" +#include "util/u_init.h" uint32_t util_half_to_float_mantissa_table[2048]; uint32_t util_half_to_float_exponent_table[64]; @@ -57,7 +58,7 @@ uint32_t util_half_to_float_offset_table[64]; uint16_t util_float_to_half_base_table[512]; uint8_t util_float_to_half_shift_table[512]; -void util_half_init_tables(void) +static void util_half_init_tables(void) { int i; @@ -153,3 +154,5 @@ void util_half_init_tables(void) util_float_to_half_shift_table[256 + i] = util_float_to_half_shift_table[i]; } } + +UTIL_INIT(util_half_init_tables); diff --git a/src/gallium/auxiliary/util/u_half.h b/src/gallium/auxiliary/util/u_half.h index 0ca660faf3..5afdd925a6 100644 --- a/src/gallium/auxiliary/util/u_half.h +++ b/src/gallium/auxiliary/util/u_half.h @@ -4,7 +4,6 @@ #include "pipe/p_compiler.h" #include "u_math.h" - #ifdef __cplusplus extern "C" { #endif @@ -59,10 +58,6 @@ util_float_to_half(float f) return util_floatui_to_half(i.ui); } -/* called by u_gctors.cpp, which defines the prototype itself */ -void util_half_init_tables(void); - - #ifdef __cplusplus } #endif 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 + -- cgit v1.2.3