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yap-6.3/C/load_dyld.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_dyld.c *
* comments: dyld based dynamic loaderr of external routines *
* tested on MacOS *
*************************************************************************/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include "Foreign.h"
#if LOAD_DYLD
#include <string.h>
/* Code originally from Rex A. Dieter's posting in comp.sys.next.programmer
and from dynload_next.c in the Python sources
*/
#import <mach-o/dyld.h>
static char *
mydlerror(void)
{
char *errString;
switch(LOCAL_dl_errno) {
default:
case NSObjectFileImageFailure:
case NSObjectFileImageFormat:
/* for these a message is printed on stderr by dyld */
errString = "Can't create object file image";
break;
case NSObjectFileImageSuccess:
errString = NULL;
break;
case NSObjectFileImageInappropriateFile:
errString = "Inappropriate file type for dynamic loading";
break;
case NSObjectFileImageArch:
errString = "Wrong CPU type in object file";
break;
case NSObjectFileImageAccess:
errString = "Can't read object file (no access)";
break;
}
return(errString);
}
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
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char *
Yap_FindExecutable(void)
{
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char path[1024];
uint32_t size = sizeof(path);
if (_NSGetExecutablePath(path, &size) == 0) {
char *rc = malloc(size+1);
strncpy(rc, path, size);
return rc;
} else {
char *rc = malloc(size+1);
if (_NSGetExecutablePath(rc, &size) == 0)
return "yap";
return rc;
}
}
static void *
mydlopen(char *path)
{
int dyld_result;
NSObjectFileImage ofile;
NSModule handle = NULL;
dyld_result = NSCreateObjectFileImageFromFile(path, &ofile);
if (dyld_result != NSObjectFileImageSuccess) {
LOCAL_dl_errno = dyld_result;
} else {
/* NSLinkModule will cause the run to abort on any link error's */
/* not very friendly but the error recovery functionality is limited */
handle = NSLinkModule(ofile, path, TRUE);
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}
return handle;
}
static void *
mydlsym(char *symbol)
{
void *addr;
char funcname[256];
#if HAVE_SNPRINTF
snprintf(funcname, sizeof(funcname), "_%.200s", symbol);
#else
sprintf(funcname, "_%.200s", symbol);
#endif
if (NSIsSymbolNameDefined(funcname))
addr = NSAddressOfSymbol(NSLookupAndBindSymbol(funcname));
else
addr = NULL;
return addr;
}
static int
mydlclose(void *handle)
{
NSUnLinkModule(handle, NSUNLINKMODULE_OPTION_NONE);
return TRUE;
}
void *
Yap_LoadForeignFile(char *file, int flags)
{
return (void *)mydlopen(file);
}
int
Yap_CallForeignFile(void *handle, char *f)
{
YapInitProc proc = (YapInitProc) mydlsym(f);
if (!proc)
return FALSE;
(*proc)();
return TRUE;
}
int
Yap_CloseForeignFile(void *handle)
{
return mydlclose(handle);
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static Int
LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
while (ofiles) {
void *handle;
/* mydlopen wants to follow the LD_CONFIG_PATH */
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if (!Yap_locateFile(AtomName(ofiles->name), LOCAL_FileNameBuf, TRUE)) {
strcpy(LOCAL_ErrorSay, "%% Trying to open unexisting file in LoadForeign");
return LOAD_FAILLED;
}
if((handle=mydlopen(LOCAL_FileNameBuf)) == 0)
{
fprintf(stderr,"calling dlopen with error %s\n", mydlerror());
/* strcpy(LOCAL_ErrorSay,dlerror());*/
return LOAD_FAILLED;
}
ofiles->handle = handle;
ofiles = ofiles->next;
}
/* load libraries first so that their symbols are available to
other routines */
while (libs) {
char *s = AtomName(lib->name);
if (ls[0] == '-') {
strcpy(LOCAL_FileNameBuf,"lib");
strcat(LOCAL_FileNameBuf,s+2);
strcat(LOCAL_FileNameBuf,".so");
} else {
strcpy(LOCAL_FileNameBuf,s);
}
if((libs->handle=mydlopen(LOCAL_FileNameBuf)) == NULL)
{
strcpy(LOCAL_ErrorSay,mydlerror());
return LOAD_FAILLED;
}
libs = libs->next;
}
*init_proc = (YapInitProc) mydlsym(proc_name);
if(! *init_proc) {
strcpy(LOCAL_ErrorSay,"Could not locate initialization routine");
return LOAD_FAILLED;
}
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign(void)
{
ForeignObj *f_code;
f_code = ForeignCodeLoaded;
while (f_code != NULL) {
StringList objs, libs;
objs = f_code->objs;
while (objs != NULL) {
if (mydlclose(objs->handle) != 0)
return; /* ERROR */
objs = objs->next;
}
libs = f_code->libs;
while (libs != NULL) {
if (mydlclose(libs->handle) != 0)
return; /* ERROR */
objs = libs->next;
}
f_code = f_code->next;
}
}
Int
Yap_ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return(LoadForeign(ofiles,libs, proc_name, init_proc));
}
#endif