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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/>.
*/
// WARNING: In this file, you will find crazy macros and dubious usage of avcall. Beware!
#if CHAR_BIT != 8
#error "Compile-time foreign functions can only be used on systems where CHAR_BIT is 8."
#endif
// avcall has some sign conversion problems on BSD
// (the macros it defines cause problems too, which is why this is ignored for so long)
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wsign-conversion"
#elif defined __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
#include <avcall.h>
#if SCHAR_MAX != 127
#error "Foreign function support requires an 8-bit signed type."
#else
#define av_type_with_limit_127 schar
#endif
#if UCHAR_MAX != 255
#error "Foreign function support requires an 8-bit unsigned type."
#else
#define av_type_with_limit_255 uchar
#endif
#if SHRT_MAX != 32767
#error "Foreign function support requires a 16-bit signed type."
#else
#define av_type_with_limit_32767 short
#endif
#if USHRT_MAX != 65535
#error "Foreign function support requires an 16-bit unsigned type."
#else
#define av_type_with_limit_65535 ushort
#endif
#if INT_MAX == 2147483647
#define av_type_with_limit_2147483647 int
#elif LONG_MAX == 2147483647
#define av_type_with_limit_2147483647 long
#else
#error "Foreign function support requires an 32-bit signed type."
#endif
#if UINT_MAX == 4294967295
#define av_type_with_limit_4294967295 uint
#elif ULONG_MAX == 4294967295
#define av_type_with_limit_4294967295 ulong
#else
#error "Foreign function support requires an 32-bit unsigned type."
#endif
#if LONG_MAX == 9223372036854775807
#define av_type_with_limit_9223372036854775807 long
#elif LLONG_MAX == 9223372036854775807
#define av_type_with_limit_9223372036854775807 longlong
#else
#error "Foreign function support requires a 64-bit signed type."
#endif
#if ULONG_MAX == 18446744073709551615ULL
#define av_type_with_limit_18446744073709551615 ulong
#elif ULLONG_MAX == 18446744073709551615ULL
#define av_type_with_limit_18446744073709551615 ulonglong
#else
#error "Foreign function support requires a 64-bit unsigned type."
#endif
#define av_type_with_limit(x) join(av_type_with_limit_, x)
#define toc_av_start(limit) join(av_start_, av_type_with_limit(limit))
#define toc_av_add(limit) join(av_, av_type_with_limit(limit))
#define toc_av_start_f32 av_start_float
#define toc_av_start_f64 av_start_double
#define toc_av_f32 av_float
#define toc_av_f64 av_double
static Status arg_list_start(av_alist *arg_list, FnPtr fn, Value *return_val, Type *return_type, Location where) {
switch (return_type->kind) {
case TYPE_UNKNOWN:
err_print(where, "Cannot call foreign function with unknown return type.");
return false;
case TYPE_TUPLE:
err_print(where, "Cannot call foreign function with tuple return type.");
return false;
case TYPE_ARR:
err_print(where, "Foreign functions cannot return arrays.");
return false;
case TYPE_FN:
warn_print(where, "Foreign function returns function pointer. If it returns a C-style function pointer, it won't be called properly by toc.");
av_start_ptr(*arg_list, fn, FnExpr *, &return_val->fn);
break;
case TYPE_PTR:
av_start_ptr(*arg_list, fn, void *, &return_val->ptr);
break;
case TYPE_BUILTIN:
switch (return_type->builtin) {
case BUILTIN_I8:
toc_av_start(127)(*arg_list, fn, &return_val->i8);
break;
case BUILTIN_U8:
toc_av_start(255)(*arg_list, fn, &return_val->u8);
break;
case BUILTIN_I16:
toc_av_start(32767)(*arg_list, fn, &return_val->i16);
break;
case BUILTIN_U16:
toc_av_start(65535)(*arg_list, fn, &return_val->u16);
break;
case BUILTIN_I32:
toc_av_start(2147483647)(*arg_list, fn, &return_val->i32);
break;
case BUILTIN_U32:
toc_av_start(4294967295)(*arg_list, fn, &return_val->u32);
break;
case BUILTIN_I64:
toc_av_start(9223372036854775807)(*arg_list, fn, &return_val->i64);
break;
case BUILTIN_U64:
toc_av_start(18446744073709551615)(*arg_list, fn, &return_val->u64);
break;
case BUILTIN_BOOL:
// bool is probably just unsigned char.... hopefully...
av_start_uchar(*arg_list, fn, &return_val->u8);
break;
case BUILTIN_CHAR:
av_start_char(*arg_list, fn, &return_val->charv);
break;
case BUILTIN_F32:
toc_av_start_f32(*arg_list, fn, &return_val->f32);
break;
case BUILTIN_F64:
toc_av_start_f64(*arg_list, fn, &return_val->f64);
break;
case BUILTIN_TYPE:
av_start_ptr(*arg_list, fn, Type *, &return_val->type);
break;
case BUILTIN_NMS:
av_start_ptr(*arg_list, fn, Namespace *, &return_val->nms);
break;
case BUILTIN_VOID:
av_start_void(*arg_list, fn);
break;
case BUILTIN_VARARGS:
assert(0);
break;
}
break;
case TYPE_STRUCT: {
size_t struct_size = compiler_sizeof(return_type);
StructDef *struc = return_type->struc;
return_val->struc = err_calloc(1, struct_size);
bool splittable;
// hopefully this is right!
if (struct_size <= sizeof(long)) {
splittable = true;
} else if (struct_size > 2*sizeof(long)) {
splittable = false;
} else if (arr_len(struc->fields) > 4) {
splittable = false;
} else {
// NOTE: this warning is not because splittable is being computed incorrectly! it doesn't handle it right with *either* splittable = 0 or splittable = 1
warn_print(where, "Dynamically calling function which returns a struct. avcall seems to not handle structs of size ~2*sizeof(long) correctly.");
splittable = true;
size_t word_size = sizeof(__avword);
arr_foreach(struc->fields, Field, f) {
if (f->offset / word_size != (f->offset + compiler_sizeof(f->type) - 1) / word_size) {
splittable = false;
break;
}
}
}
// getting warning on Debian stretch about splittable being set but not used
_av_start_struct(*arg_list, fn, struct_size, splittable, return_val->struc); (void)splittable;
} break;
case TYPE_SLICE:
av_start_struct(*arg_list, fn, Slice, av_word_splittable_2(I64, void *), &return_val->slice);
break;
case TYPE_EXPR:
assert(0);
return false;
}
return true;
}
static Status arg_list_add(av_alist *arg_list, Value val, Type *type, Location where) {
switch (type->kind) {
case TYPE_TUPLE:
case TYPE_UNKNOWN:
case TYPE_ARR: { // @TODO: maybe just pass pointer for arr?
char *s = type_to_str(type);
err_print(where, "Cannot pass type %s to foreign function.", s);
free(s);
return false;
}
case TYPE_PTR:
av_ptr(*arg_list, void *, val.ptr);
break;
case TYPE_FN:
warn_print(where, "Passing toc function pointer to foreign function. This will not work if the function expects a C-style function pointer.");
av_ptr(*arg_list, FnExpr *, val.fn);
break;
case TYPE_BUILTIN:
switch (type->builtin) {
case BUILTIN_I8:
toc_av_add(127)(*arg_list, val.i8);
break;
case BUILTIN_U8:
toc_av_add(255)(*arg_list, val.u8);
break;
case BUILTIN_I16:
toc_av_add(32767)(*arg_list, val.i16);
break;
case BUILTIN_U16:
toc_av_add(65535)(*arg_list, val.u16);
break;
case BUILTIN_I32:
toc_av_add(2147483647)(*arg_list, val.i32);
break;
case BUILTIN_U32:
toc_av_add(4294967295)(*arg_list, val.u32);
break;
case BUILTIN_I64:
toc_av_add(9223372036854775807)(*arg_list, val.i64);
break;
case BUILTIN_U64:
toc_av_add(18446744073709551615)(*arg_list, val.u64);
break;
case BUILTIN_CHAR:
av_char(*arg_list, val.charv);
break;
case BUILTIN_BOOL:
av_uchar(*arg_list, val.boolv);
break;
case BUILTIN_F32:
toc_av_f32(*arg_list, val.f32);
break;
case BUILTIN_F64:
toc_av_f64(*arg_list, val.f64);
break;
case BUILTIN_TYPE:
av_ptr(*arg_list, Type *, val.type);
break;
case BUILTIN_NMS:
av_ptr(*arg_list, Namespace *, val.nms);
break;
case BUILTIN_VARARGS:
arr_foreach(val.varargs, VarArg, arg) {
if (!arg_list_add(arg_list, arg->val, arg->type, where))
return false;
}
break;
case BUILTIN_VOID:
err_print(where, "Cannot pass type void to foreign function.");
return false;
}
break;
case TYPE_SLICE:
av_struct(*arg_list, Slice, val.slice);
break;
case TYPE_STRUCT:
_av_struct(*arg_list, compiler_sizeof(type), compiler_alignof(type), val.struc);
break;
case TYPE_EXPR:
assert(0);
return false;
}
return true;
}
#ifdef __clang__
#pragma clang diagnostic pop
#elif defined __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) {
FnPtr fn_ptr = foreign_get_fn_ptr(ffmgr, fn, call_where);
if (!fn_ptr) return false;
av_alist arg_list;
if (!arg_list_start(&arg_list, fn_ptr, ret, ret_type, call_where))
return false;
char *type = (char *)arg_types;
for (size_t i = 0; i < nargs; ++i) {
if (!arg_list_add(&arg_list, args[i], (Type *)type, call_where))
return false;
type += arg_types_stride;
}
av_call(arg_list);
return true;
}
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