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cairo-compiler-private.h
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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <[email protected]>
*/
#ifndef CAIRO_COMPILER_PRIVATE_H
#define CAIRO_COMPILER_PRIVATE_H
#include "cairo.h"
#if HAVE_CONFIG_H
#include "config.h"
#endif
/* Size in bytes of buffer to use off the stack per functions.
* Mostly used by text functions. For larger allocations, they'll
* malloc(). */
#ifndef CAIRO_STACK_BUFFER_SIZE
#define CAIRO_STACK_BUFFER_SIZE (512 * sizeof (int))
#endif
#define CAIRO_STACK_ARRAY_LENGTH(T) (CAIRO_STACK_BUFFER_SIZE / sizeof(T))
/*
* The goal of this block is to define the following macros for
* providing faster linkage to functions in the public API for calls
* from within cairo.
*
* slim_hidden_proto(f)
* slim_hidden_proto_no_warn(f)
*
* Declares `f' as a library internal function and hides the
* function from the global symbol table. This macro must be
* expanded after `f' has been declared with a prototype but before
* any calls to the function are seen by the compiler. The no_warn
* variant inhibits warnings about the return value being unused at
* call sites. The macro works by renaming `f' to an internal name
* in the symbol table and hiding that. As far as cairo internal
* calls are concerned they're calling a library internal function
* and thus don't need to bounce via the PLT.
*
* slim_hidden_def(f)
*
* Exports `f' back to the global symbol table. This macro must be
* expanded right after the function definition and only for symbols
* hidden previously with slim_hidden_proto(). The macro works by
* adding a global entry to the symbol table which points at the
* internal name of `f' created by slim_hidden_proto().
*
* Functions in the public API which aren't called by the library
* don't need to be hidden and re-exported using the slim hidden
* macros.
*/
#if __GNUC__ >= 3 && defined(__ELF__) && !defined(__sun)
# define slim_hidden_proto(name) slim_hidden_proto1(name, slim_hidden_int_name(name)) cairo_private
# define slim_hidden_proto_no_warn(name) slim_hidden_proto1(name, slim_hidden_int_name(name)) cairo_private_no_warn
# define slim_hidden_def(name) slim_hidden_def1(name, slim_hidden_int_name(name))
# define slim_hidden_int_name(name) INT_##name
# define slim_hidden_proto1(name, internal) \
extern __typeof (name) name \
__asm__ (slim_hidden_asmname (internal))
# define slim_hidden_def1(name, internal) \
extern __typeof (name) EXT_##name __asm__(slim_hidden_asmname(name)) \
__attribute__((__alias__(slim_hidden_asmname(internal))))
# define slim_hidden_ulp slim_hidden_ulp1(__USER_LABEL_PREFIX__)
# define slim_hidden_ulp1(x) slim_hidden_ulp2(x)
# define slim_hidden_ulp2(x) #x
# define slim_hidden_asmname(name) slim_hidden_asmname1(name)
# define slim_hidden_asmname1(name) slim_hidden_ulp #name
#else
# define slim_hidden_proto(name) int _cairo_dummy_prototype(void)
# define slim_hidden_proto_no_warn(name) int _cairo_dummy_prototype(void)
# define slim_hidden_def(name) int _cairo_dummy_prototype(void)
#endif
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
#define CAIRO_PRINTF_FORMAT(fmt_index, va_index) \
__attribute__((__format__(__printf__, fmt_index, va_index)))
#else
#define CAIRO_PRINTF_FORMAT(fmt_index, va_index)
#endif
/* slim_internal.h */
#define CAIRO_HAS_HIDDEN_SYMBOLS 1
#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)) && \
(defined(__ELF__) || defined(__APPLE__)) && \
!defined(__sun)
#define cairo_private_no_warn __attribute__((__visibility__("hidden")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x550)
#define cairo_private_no_warn __hidden
#else /* not gcc >= 3.3 and not Sun Studio >= 8 */
#define cairo_private_no_warn
#undef CAIRO_HAS_HIDDEN_SYMBOLS
#endif
#ifndef WARN_UNUSED_RESULT
#define WARN_UNUSED_RESULT
#endif
/* Add attribute(warn_unused_result) if supported */
#define cairo_warn WARN_UNUSED_RESULT
#define cairo_private cairo_private_no_warn cairo_warn
/* This macro allow us to deprecate a function by providing an alias
for the old function name to the new function name. With this
macro, binary compatibility is preserved. The macro only works on
some platforms --- tough.
Meanwhile, new definitions in the public header file break the
source code so that it will no longer link against the old
symbols. Instead it will give a descriptive error message
indicating that the old function has been deprecated by the new
function.
*/
#if __GNUC__ >= 2 && defined(__ELF__)
# define CAIRO_FUNCTION_ALIAS(old, new) \
extern __typeof (new) old \
__asm__ ("" #old) \
__attribute__((__alias__("" #new)))
#else
# define CAIRO_FUNCTION_ALIAS(old, new)
#endif
/*
* Cairo uses the following function attributes in order to improve the
* generated code (effectively by manual inter-procedural analysis).
*
* 'cairo_pure': The function is only allowed to read from its arguments
* and global memory (i.e. following a pointer argument or
* accessing a shared variable). The return value should
* only depend on its arguments, and for an identical set of
* arguments should return the same value.
*
* 'cairo_const': The function is only allowed to read from its arguments.
* It is not allowed to access global memory. The return
* value should only depend its arguments, and for an
* identical set of arguments should return the same value.
* This is currently the most strict function attribute.
*
* Both these function attributes allow gcc to perform CSE and
* constant-folding, with 'cairo_const 'also guaranteeing that pointer contents
* do not change across the function call.
*/
#if __GNUC__ >= 3
#define cairo_pure __attribute__((pure))
#define cairo_const __attribute__((const))
#define cairo_always_inline inline __attribute__((always_inline))
#else
#define cairo_pure
#define cairo_const
#define cairo_always_inline inline
#endif
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define likely(expr) (__builtin_expect (!!(expr), 1))
#define unlikely(expr) (__builtin_expect (!!(expr), 0))
#else
#define likely(expr) (expr)
#define unlikely(expr) (expr)
#endif
#ifndef __GNUC__
#undef __attribute__
#define __attribute__(x)
#endif
#if (defined(__WIN32__) && !defined(__WINE__)) || defined(_MSC_VER)
#define access _access
#define fdopen _fdopen
#define hypot _hypot
#define pclose _pclose
#define popen _popen
#define snprintf _snprintf
#define strdup _strdup
#define unlink _unlink
#define vsnprintf _vsnprintf
#endif
#ifdef _MSC_VER
#ifndef __cplusplus
#undef inline
#define inline __inline
#endif
#endif
#if 0 //defined(_MSC_VER) && defined(_M_IX86) // VRP: This is causing build problems, so just use __declspec(noinline)
/* When compiling with /Gy and /OPT:ICF identical functions will be folded in together.
The CAIRO_ENSURE_UNIQUE macro ensures that a function is always unique and
will never be folded into another one. Something like this might eventually
be needed for GCC but it seems fine for now. */
#define CAIRO_ENSURE_UNIQUE \
do { \
char func[] = __FUNCTION__; \
char file[] = __FILE__; \
__asm { \
__asm jmp __internal_skip_line_no \
__asm _emit (__LINE__ & 0xff) \
__asm _emit ((__LINE__>>8) & 0xff) \
__asm _emit ((__LINE__>>16) & 0xff) \
__asm _emit ((__LINE__>>24) & 0xff) \
__asm lea eax, func \
__asm lea eax, file \
__asm __internal_skip_line_no: \
}; \
} while (0)
#else
#define CAIRO_ENSURE_UNIQUE do { } while (0)
#endif
#ifdef __STRICT_ANSI__
#undef inline
#define inline __inline__
#endif
#endif