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/*
* tclStubCall.c --
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#ifndef _WIN32
# include <dlfcn.h>
#else
# define dlopen(a,b) (void *)LoadLibraryW(JOIN(L,a))
# define dlsym(a,b) (void *)GetProcAddress((HMODULE)(a),b)
# define dlerror() ""
#endif
MODULE_SCOPE void *tclStubsHandle;
/*
*----------------------------------------------------------------------
*
* TclStubCall --
*
* Load the Tcl core dynamically, version "9.0" (or higher, in future versions).
*
* Results:
* Returns a function from the Tcl dynamic library or a function
* returning NULL if that function cannot be found. See PROCNAME table.
*
* The functions Tcl_MainEx and Tcl_MainExW never return.
* Tcl_GetMemoryInfo and Tcl_StaticLibrary return (void),
* Tcl_SetExitProc returns its previous exitProc and
* Tcl_SetPreInitScript returns the previous script. This means that
* those 6 functions cannot be used to initialize the stub-table,
* only the first 4 functions in the table can do that.
*
*----------------------------------------------------------------------
*/
/* Table containing which function will be returned, depending on the "arg" */
static const char PROCNAME[][24] = {
"_Tcl_SetPanicProc", /* Default, whenever "arg" <= 0 or "arg" > 9 */
"_Tcl_InitSubsystems", /* "arg" == (void *)1 */
"_Tcl_FindExecutable", /* "arg" == (void *)2 */
"_TclZipfs_AppHook", /* "arg" == (void *)3 */
"_Tcl_MainExW", /* "arg" == (void *)4 */
"_Tcl_MainEx", /* "arg" == (void *)5 */
"_Tcl_StaticLibrary", /* "arg" == (void *)6 */
"_Tcl_SetExitProc", /* "arg" == (void *)7 */
"_Tcl_GetMemoryInfo", /* "arg" == (void *)8 */
"_Tcl_SetPreInitScript" /* "arg" == (void *)9 */
};
MODULE_SCOPE const void *nullVersionProc(void) {
return NULL;
}
static const char CANNOTCALL[] = "Cannot call %s from stubbed extension\n";
static const char CANNOTFIND[] = "Cannot find %s: %s\n";
MODULE_SCOPE void *
TclStubCall(void *arg)
{
static void *stubFn[] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
size_t index = PTR2UINT(arg);
if (index >= sizeof(PROCNAME)/sizeof(PROCNAME[0])) {
/* Any other value means Tcl_SetPanicProc() with non-null panicProc */
index = 0;
}
if (tclStubsHandle == INT2PTR(-1)) {
if ((index == 0) && (arg != NULL)) {
((Tcl_PanicProc *)arg)(CANNOTCALL, PROCNAME[index] + 1);
} else {
fprintf(stderr, CANNOTCALL, PROCNAME[index] + 1);
abort();
}
}
if (!stubFn[index]) {
if (!tclStubsHandle) {
tclStubsHandle = dlopen(CFG_RUNTIME_DLLFILE, RTLD_NOW|RTLD_LOCAL);
if (!tclStubsHandle) {
#if defined(_WIN32)
tclStubsHandle = dlopen(CFG_RUNTIME_BINDIR "\\" CFG_RUNTIME_DLLFILE, RTLD_NOW|RTLD_LOCAL);
#elif defined(__CYGWIN__)
tclStubsHandle = dlopen(CFG_RUNTIME_BINDIR "/" CFG_RUNTIME_DLLFILE, RTLD_NOW|RTLD_LOCAL);
#else
tclStubsHandle = dlopen(CFG_RUNTIME_LIBDIR "/" CFG_RUNTIME_DLLFILE, RTLD_NOW|RTLD_LOCAL);
#endif
}
if (!tclStubsHandle) {
if ((index == 0) && (arg != NULL)) {
((Tcl_PanicProc *)arg)(CANNOTFIND, CFG_RUNTIME_DLLFILE, dlerror());
} else {
fprintf(stderr, CANNOTFIND, CFG_RUNTIME_DLLFILE, dlerror());
abort();
}
}
}
stubFn[index] = dlsym(tclStubsHandle, PROCNAME[index] + 1);
if (!stubFn[index]) {
stubFn[index] = dlsym(tclStubsHandle, PROCNAME[index]);
if (!stubFn[index]) {
stubFn[index] = (void *)nullVersionProc;
}
}
}
return stubFn[index];
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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