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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/>.
*/
#if SIZE_MAX != U64_MAX
#error "What's going on? The 64-bit #foreign file was included, but size_t isn't 64 bits!"
#endif
#ifdef __cplusplus
#define external extern "C"
#else
#define external extern
#endif
#ifdef _WIN64
external U64 win64_call(FnPtr fn, U64 *args, I64 nargs);
external float win64_callf(FnPtr fn, U64 *args, I64 nargs);
external double win64_calld(FnPtr fn, U64 *args, I64 nargs);
static inline U64 foreign_calli(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
(void)is_float;
return win64_call(fn, args, nargs);
}
static inline float foreign_callf(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
(void)is_float;
return win64_callf(fn, args, nargs);
}
static inline double foreign_calld(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
(void)is_float;
return win64_calld(fn, args, nargs);
}
#else
external U64 systemv64_call(FnPtr fn, U64 *args, I64 nargs, bool *is_float);
external float systemv64_callf(FnPtr fn, U64 *args, I64 nargs, bool *is_float);
external double systemv64_calld(FnPtr fn, U64 *args, I64 nargs, bool *is_float);
static inline U64 foreign_calli(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
return systemv64_call(fn, args, nargs, is_float);
}
static inline float foreign_callf(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
return systemv64_callf(fn, args, nargs, is_float);
}
static inline double foreign_calld(FnPtr fn, U64 *args, I64 nargs, bool *is_float) {
return systemv64_calld(fn, args, nargs, is_float);
}
#endif
/* disable strict aliasing warnings */
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#endif
static Status val_to_word(Value v, Type *t, Location where, U64 *w) {
switch (t->kind) {
case TYPE_BUILTIN:
switch (t->builtin) {
case BUILTIN_I8: *w = (U64)v.i8; break;
case BUILTIN_I16: *w = (U64)v.i16; break;
case BUILTIN_I32: *w = (U64)v.i32; break;
case BUILTIN_U8: *w = (U64)v.u8; break;
case BUILTIN_U16: *w = (U64)v.u16; break;
case BUILTIN_U32: *w = (U64)v.u32; break;
case BUILTIN_I64: *w = (U64)v.i64; break;
case BUILTIN_U64: *w = v.u64; break;
case BUILTIN_F32: *w = (U64)*(U32 *)&v.f32; break;
case BUILTIN_F64: *w = *(U64 *)&v.f64; break;
case BUILTIN_CHAR: *w = (U64)v.charv; break;
case BUILTIN_BOOL: *w = (U64)v.boolv; break;
case BUILTIN_TYPE:
case BUILTIN_VARARGS:
case BUILTIN_NMS:
case BUILTIN_VOID:
goto unsupported;
}
break;
case TYPE_PTR:
*w = (U64)v.ptr; break;
default:
unsupported: {
/* @TODO(eventually) */
char *s = type_to_str(t);
err_print(where, "#foreign functions can't take arguments of type %s at compile time on Windows.", s);
free(s);
return false;
}
}
return true;
}
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
static Status foreign_call(ForeignFnManager *ffmgr, FnExpr *fn, Type *ret_type, Type *arg_types, size_t arg_types_stride, Value *args, size_t nargs, Location call_where, Value *ret) {
possibly_static_assert(sizeof(double) == 8); /* if either of these assertions fails, you'll need to use libffcall */
possibly_static_assert(sizeof(float) == 4);
#if 0
#define FOREIGN_DEBUGGING 1
#endif
#if FOREIGN_DEBUGGING
printf("Foreign call: %s(", fn->foreign.name);
#endif
FnPtr fn_ptr = foreign_get_fn_ptr(ffmgr, fn, call_where);
if (!fn_ptr) return false;
/* @OPTIM: use alloca/_malloca if available */
U64 *words = err_malloc(nargs * sizeof *words);
bool *is_float = err_malloc(nargs);
U64 *word = words;
char *type = (char *)arg_types;
for (size_t i = 0; i < nargs; ++i) {
#if FOREIGN_DEBUGGING
if (i) printf(", ");
fprint_val(stdout, args[i], (Type *)type);
#endif
if (!val_to_word(args[i], (Type *)type, call_where, word))
return false;
is_float[i] = type_is_float((Type *)type);
type += arg_types_stride;
++word;
}
int kind = 0; /* 0=>integer, 1=>f32, 2=>f64 */
switch (ret_type->kind) {
case TYPE_BUILTIN:
switch (ret_type->builtin) {
case BUILTIN_I8:
case BUILTIN_I16:
case BUILTIN_I32:
case BUILTIN_I64:
case BUILTIN_U8:
case BUILTIN_U16:
case BUILTIN_U32:
case BUILTIN_U64:
case BUILTIN_BOOL:
case BUILTIN_CHAR:
case BUILTIN_VOID:
break;
case BUILTIN_F32:
kind = 1;
break;
case BUILTIN_F64:
kind = 2;
break;
default:
goto unsupported;
}
break;
case TYPE_PTR:
break;
default:
unsupported: {
char *s = type_to_str(ret_type);
/* @TODO(eventually) */
err_print(call_where, "You can't call functions which return type %s at compile time on Windows.", s);
free(s);
return false;
}
}
switch (kind) {
case 0: {
U64 r = foreign_calli(fn_ptr, words, (I64)nargs, is_float);
switch (ret_type->kind) {
case TYPE_BUILTIN:
switch (ret_type->builtin) {
case BUILTIN_I8: ret->i8 = (I8)r; break;
case BUILTIN_I16: ret->i16 = (I16)r; break;
case BUILTIN_I32: ret->i32 = (I32)r; break;
case BUILTIN_I64: ret->i64 = (I64)r; break;
case BUILTIN_U8: ret->u8 = (U8)r; break;
case BUILTIN_U16: ret->u16 = (U16)r; break;
case BUILTIN_U32: ret->u32 = (U32)r; break;
case BUILTIN_U64: ret->u64 = (U64)r; break;
case BUILTIN_BOOL: ret->boolv = (bool)r; break;
case BUILTIN_CHAR: ret->charv = (char)r; break;
case BUILTIN_VOID: (void)r; break;
default: assert(0); break;
}
break;
case TYPE_PTR:
ret->ptr = (void *)r;
break;
default: assert(0); break;
}
} break;
case 1:
ret->f32 = foreign_callf(fn_ptr, words, (I64)nargs, is_float);
break;
case 2:
ret->f64 = foreign_calld(fn_ptr, words, (I64)nargs, is_float);
break;
}
#if FOREIGN_DEBUGGING
printf(") => ");
fprint_val(stdout, *ret, ret_type);
#if 1
printf(" (errno: %d)", errno);
#endif
printf("\n");
#endif
free(words);
free(is_float);
return true;
}
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