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/*
Copyright (C) 2019, 2020 Leo Tenenbaum.
This file is part of toc. toc is distributed under version 3 of the GNU General Public License, without any warranty whatsoever.
You should have received a copy of the GNU General Public License along with toc. If not, see <https://www.gnu.org/licenses/>.
*/
#include <windows.h>
typedef struct {
HMODULE handle;
} Library;
static FnPtr foreign_get_fn_ptr(ForeignFnManager *ffmgr, FnExpr *fn, Location call_where) {
FnPtr fn_ptr = fn->foreign.fn_ptr;
if (!fn_ptr) {
assert(fn->flags & FN_EXPR_FOREIGN);
char const *libname = fn->foreign.lib;
if (!libname) {
err_print(call_where, "Attempt to call function at compile time which does not have an associated library.");
info_print(fn->where, "Function was declared here.");
return NULL;
}
Library *lib = str_hash_table_get(&ffmgr->libs_loaded, libname, strlen(libname));
if (!lib) {
HMODULE handle = LoadLibraryA(libname);
if (!handle) {
DWORD err = GetLastError();
err_print(call_where, "Could not open dynamic library %s (error code %ld).", libname, err);
return NULL;
}
lib = str_hash_table_insert(&ffmgr->libs_loaded, libname, strlen(libname));
lib->handle = handle;
}
const char *name = fn->foreign.name;
fn_ptr = (FnPtr)GetProcAddress(lib->handle, name);
if (!fn_ptr) {
err_print(call_where, "Could not get function %s from dynamic library.", name);
return NULL;
}
fn->foreign.fn_ptr = fn_ptr;
}
return fn_ptr;
}
#ifdef FOREIGN_USE_AVCALL
#include "foreign_avcall.c"
#elif defined _WIN64
#include "foreign64.c"
#else
#include "foreign_msvc32.c"
#endif
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