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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/>.
*/
/*
this code is not standard-compliant in the slightest, and a bit dubious,
but I don't think there's any other way that doesn't involve assembly
*/
typedef size_t Word;
#if SIZE_MAX != U32_MAX
#error "What's going on? The 32-bit Windows file was included, but size_t isn't 32 bits!"
#endif
/* f64s take 2 words */
static Status val_to_words(Value v, Type *t, Location where, Word *w) {
switch (t->kind) {
case TYPE_BUILTIN:
switch (t->builtin) {
case BUILTIN_I8: *w = (Word)v.i8; break;
case BUILTIN_I16: *w = (Word)v.i16; break;
case BUILTIN_I32: *w = (Word)v.i32; break;
case BUILTIN_U8: *w = (Word)v.u8; break;
case BUILTIN_U16: *w = (Word)v.u16; break;
case BUILTIN_U32: *w = (Word)v.u32; break;
case BUILTIN_F32: *w = (Word)*(U32 *)&v.f32; break;
case BUILTIN_I64:
case BUILTIN_U64:
case BUILTIN_F64: {
Word *ws = (Word *)&v;
w[0] = ws[0];
w[1] = ws[1];
} break;
case BUILTIN_CHAR: *w = (Word)v.charv; break;
case BUILTIN_BOOL: *w = (Word)v.boolv; break;
case BUILTIN_TYPE:
case BUILTIN_VARARGS:
case BUILTIN_NMS:
case BUILTIN_VOID:
goto unsupported;
}
break;
case TYPE_PTR:
*w = (Word)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;
}
/*
because of the way the MSVC "cdecl" calling convention works, the only things that affect the way a function is called are
the number of arguments and whether the function returns an integer (or pointer), floating-point number,
or struct (struct return values are not supported yet).
this means we can get away with these twenty functions--GCC/MSVC x64 pass most arguments in registers, so there would need to be
a lot more functions to support different combinations of integer and floating-point arguments (since they use different
registers)
*/
/* call function with 0 arguments, returning some sort of integer (or pointer) */
static U64 msvc_call0i(FnPtr fn, Word *w) {
(void)w;
return ((U64(*)(void))fn)();
}
static U64 msvc_call1i(FnPtr fn, Word *w) {
return ((U64(*)(Word))fn)(w[0]);
}
static U64 msvc_call2i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word))fn)(w[0], w[1]);
}
static U64 msvc_call3i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word))fn)(w[0], w[1], w[2]);
}
static U64 msvc_call4i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3]);
}
static U64 msvc_call5i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4]);
}
static U64 msvc_call6i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5]);
}
static U64 msvc_call7i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6]);
}
static U64 msvc_call8i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7]);
}
static U64 msvc_call9i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7], w[8]);
}
static U64 msvc_call10i(FnPtr fn, Word *w) {
return ((U64(*)(Word, Word, Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7], w[8], w[9]);
}
static U64 (*const msvc_calli[11])(FnPtr fn, Word *w) = {
msvc_call0i,
msvc_call1i,
msvc_call2i,
msvc_call3i,
msvc_call4i,
msvc_call5i,
msvc_call6i,
msvc_call7i,
msvc_call8i,
msvc_call9i,
msvc_call10i
};
/* call function with 0 arguments, returning a float or double */
static double msvc_call0f(FnPtr fn, Word *w) {
(void)w;
return ((double(*)(void))fn)();
}
static double msvc_call1f(FnPtr fn, Word *w) {
return ((double(*)(Word))fn)(w[0]);
}
static double msvc_call2f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word))fn)(w[0], w[1]);
}
static double msvc_call3f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word))fn)(w[0], w[1], w[2]);
}
static double msvc_call4f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3]);
}
static double msvc_call5f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4]);
}
static double msvc_call6f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5]);
}
static double msvc_call7f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6]);
}
static double msvc_call8f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7]);
}
static double msvc_call9f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7], w[8]);
}
static double msvc_call10f(FnPtr fn, Word *w) {
return ((double(*)(Word, Word, Word, Word, Word, Word, Word, Word, Word, Word))fn)(w[0], w[1], w[2], w[3], w[4], w[5], w[6], w[7], w[8], w[9]);
}
static double (*const msvc_callf[11])(FnPtr fn, Word *w) = {
msvc_call0f,
msvc_call1f,
msvc_call2f,
msvc_call3f,
msvc_call4f,
msvc_call5f,
msvc_call6f,
msvc_call7f,
msvc_call8f,
msvc_call9f,
msvc_call10f
};
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);
possibly_static_assert(sizeof(float) == 4);
FnPtr fn_ptr = foreign_get_fn_ptr(ffmgr, fn, call_where);
if (!fn_ptr) return false;
Word words[10];
Word *word = words;
char *type = (char *)arg_types;
for (size_t i = 0; i < nargs; ++i) {
int arg_words = compiler_sizeof((Type *)type) == 8 ? 2 : 1;
if (word + arg_words > words + 10) {
err_print(call_where, "You can only call functions with up to 40 bytes of arguments on 32-bit Windows.");
return false;
}
if (!val_to_words(args[i], (Type *)type, call_where, word))
return false;
type += arg_types_stride;
word += arg_words;
}
size_t nwords = (size_t)(word - words);
bool is_float = false;
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:
case BUILTIN_F64:
is_float = true;
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;
}
}
if (is_float) {
double d = msvc_callf[nwords](fn_ptr, words);
assert(ret_type->kind == TYPE_BUILTIN);
if (ret_type->builtin == BUILTIN_F32) {
ret->f32 = (F32)d; /* turns out functions just always return doubles */
} else {
assert(ret_type->builtin == BUILTIN_F64);
ret->f64 = d;
}
} else {
U64 r = msvc_calli[nwords](fn_ptr, words);
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;
}
}
return true;
}
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