picrin/extlib/benz/error.c

248 lines
4.6 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/object.h"
void
pic_panic(pic_state PIC_UNUSED(*pic), const char *msg)
{
extern PIC_NORETURN void abort();
#if DEBUG
fprintf(stderr, "abort: %s\n", msg);
#else
(void)msg;
#endif
PIC_ABORT(pic);
}
void
pic_warnf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
pic_value err;
va_start(ap, fmt);
err = pic_vstrf_value(pic, fmt, ap);
va_end(ap);
pic_fprintf(pic, pic_stderr(pic), "warn: %s\n", pic_str(pic, err));
}
void
pic_errorf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
const char *msg;
pic_value err;
va_start(ap, fmt);
err = pic_vstrf_value(pic, fmt, ap);
va_end(ap);
msg = pic_str(pic, err);
pic_error(pic, "", msg, pic_nil_value(pic));
}
pic_value
pic_native_exception_handler(pic_state *pic)
{
pic_value err;
pic_get_args(pic, "o", &err);
pic->err = err;
pic_call(pic, pic_closure_ref(pic, 0), 1, pic_false_value(pic));
PIC_UNREACHABLE();
}
void
pic_push_handler(pic_state *pic, pic_value handler)
{
size_t xp_len;
ptrdiff_t xp_offset;
if (pic->xp >= pic->xpend) {
xp_len = (size_t)(pic->xpend - pic->xpbase) * 2;
xp_offset = pic->xp - pic->xpbase;
pic->xpbase = pic_realloc(pic, pic->xpbase, sizeof(struct pic_proc *) * xp_len);
pic->xp = pic->xpbase + xp_offset;
pic->xpend = pic->xpbase + xp_len;
}
*pic->xp++ = pic_proc_ptr(pic, handler);
}
pic_value
pic_pop_handler(pic_state *pic)
{
if (pic->xp == pic->xpbase) {
pic_panic(pic, "no exception handler registered");
}
return pic_obj_value(*--pic->xp);
}
pic_value
pic_make_error(pic_state *pic, const char *type, const char *msg, pic_value irrs)
{
struct pic_error *e;
pic_value stack, ty = pic_intern_cstr(pic, type);
stack = pic_get_backtrace(pic);
e = (struct pic_error *)pic_obj_alloc(pic, sizeof(struct pic_error), PIC_TYPE_ERROR);
e->type = pic_sym_ptr(pic, ty);
e->msg = pic_str_ptr(pic, pic_cstr_value(pic, msg));
e->irrs = irrs;
e->stack = pic_str_ptr(pic, stack);
return pic_obj_value(e);
}
pic_value
pic_raise_continuable(pic_state *pic, pic_value err)
{
pic_value handler, v;
handler = pic_pop_handler(pic);
pic_protect(pic, handler);
v = pic_call(pic, handler, 1, err);
pic_push_handler(pic, handler);
return v;
}
void
pic_raise(pic_state *pic, pic_value err)
{
pic_value val;
val = pic_raise_continuable(pic, err);
pic_pop_handler(pic);
pic_errorf(pic, "error handler returned with ~s on error ~s", val, err);
}
void
pic_error(pic_state *pic, const char *type, const char *msg, pic_value irrs)
{
pic_raise(pic, pic_make_error(pic, type, msg, irrs));
}
static pic_value
pic_error_with_exception_handler(pic_state *pic)
{
pic_value handler, thunk, val;
pic_get_args(pic, "ll", &handler, &thunk);
pic_push_handler(pic, handler);
val = pic_call(pic, thunk, 0);
pic_pop_handler(pic);
return val;
}
static pic_value
pic_error_raise(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
pic_raise(pic, v);
}
static pic_value
pic_error_raise_continuable(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_raise_continuable(pic, v);
}
static pic_value
pic_error_error(pic_state *pic)
{
const char *str;
int argc;
pic_value *argv;
pic_get_args(pic, "z*", &str, &argc, &argv);
pic_error(pic, "", str, pic_make_list(pic, argc, argv));
}
static pic_value
pic_error_error_object_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_error_p(pic, v));
}
static pic_value
pic_error_error_object_message(pic_state *pic)
{
pic_value e;
pic_get_args(pic, "o", &e);
pic_assert_type(pic, e, error);
return pic_obj_value(pic_error_ptr(pic, e)->msg);
}
static pic_value
pic_error_error_object_irritants(pic_state *pic)
{
pic_value e;
pic_get_args(pic, "o", &e);
pic_assert_type(pic, e, error);
return pic_error_ptr(pic, e)->irrs;
}
static pic_value
pic_error_error_object_type(pic_state *pic)
{
pic_value e;
pic_get_args(pic, "o", &e);
pic_assert_type(pic, e, error);
return pic_obj_value(pic_error_ptr(pic, e)->type);
}
void
pic_init_error(pic_state *pic)
{
pic_defun(pic, "with-exception-handler", pic_error_with_exception_handler);
pic_defun(pic, "raise", pic_error_raise);
pic_defun(pic, "raise-continuable", pic_error_raise_continuable);
pic_defun(pic, "error", pic_error_error);
pic_defun(pic, "error-object?", pic_error_error_object_p);
pic_defun(pic, "error-object-message", pic_error_error_object_message);
pic_defun(pic, "error-object-irritants", pic_error_error_object_irritants);
pic_defun(pic, "error-object-type", pic_error_error_object_type);
}