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/*
* xml2_shim.c
* graphviz
*
* Created by Glen Low on Fri Apr 16 2004.
* Copyright (c) 2004, Pixelglow Software. All rights reserved.
* http://www.pixelglow.com/graphviz/
* graphviz@pixelglow.com
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the name of Pixelglow Software nor the names of its contributors may be used to endorse or
* promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This shim is to correct a nasty bug on Mac OS X 10.2, where if a framework dylib (dotneato) is weak linked to
// another dylib (libxml2), dyld will crash before hitting main. Since libxml2 is only present on 10.3, we have
// cannot strong link to it. So we will programmatically load it ourselves and bind it to the right functions.
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xmlIO.h>
#include <libxml/xmlreader.h>
#include <mach-o/dyld.h>
// one static function pointer per function
#define FUNCTION(NAME) static void* NAME##_ptr = 0;
#include <xml2_shim.h>
#undef FUNCTION
int xml2_available ()
{
static int once = 1;
static const struct mach_header* image = NULL;
if (once) {
if ((image = NSAddImage ("/usr/lib/libxml2.dylib",
NSADDIMAGE_OPTION_WITH_SEARCHING |NSADDIMAGE_OPTION_RETURN_ON_ERROR))) {
NSSymbol symbol;
// bind each static function pointer to the right function
#define FUNCTION(NAME) \
symbol = NSLookupSymbolInImage (image, "_" #NAME, NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); \
NAME##_ptr = symbol ? NSAddressOfSymbol (symbol) : NULL;
#include <xml2_shim.h>
#undef FUNCTION
}
once = 0;
}
return (int) image;
}
void stubs ()
{
// one Mach-O stub for each xml2 function
#define FUNCTION(NAME) asm ( \
".align 2\n\t" \
".globl _" #NAME "\n" \
"_" #NAME ":\n\t" \
"mflr r0\n\t" \
"bcl 20,31,1f\n" \
"1:\n\t" \
"mflr r11\n\t" \
"mtlr r0\n\t" \
"addis r11,r11,ha16(_" #NAME "_ptr-1b)\n\t" \
"lwz r12,lo16(_" #NAME "_ptr-1b)(r11)\n\t" \
"mtctr r12\n\t" \
"bctr");
#include <xml2_shim.h>
#undef FUNCTION
}
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