picrin/error.c

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6.3 KiB
C
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/**
* See Copyright Notice in picrin.h
*/
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "picrin.h"
#include "picrin/pair.h"
#include "picrin/proc.h"
#include "picrin/cont.h"
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#include "picrin/data.h"
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#include "picrin/string.h"
#include "picrin/error.h"
void
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pic_panic(pic_state *pic, const char *msg)
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{
UNUSED(pic);
fprintf(stderr, "abort: %s\n", msg);
abort();
}
void
pic_warnf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
pic_value err_line;
va_start(ap, fmt);
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err_line = pic_xvformat(pic, fmt, ap);
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va_end(ap);
fprintf(stderr, "warn: %s\n", pic_str_cstr(pic_str_ptr(pic_car(pic, err_line))));
}
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void
pic_errorf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
pic_value err_line, irrs;
const char *msg;
va_start(ap, fmt);
err_line = pic_xvformat(pic, fmt, ap);
va_end(ap);
msg = pic_str_cstr(pic_str_ptr(pic_car(pic, err_line)));
irrs = pic_cdr(pic, err_line);
pic_error(pic, msg, irrs);
}
const char *
pic_errmsg(pic_state *pic)
{
pic_str *str;
assert(! pic_undef_p(pic->err));
if (! pic_error_p(pic->err)) {
str = pic_format(pic, "~s", pic->err);
} else {
str = pic_error_ptr(pic->err)->msg;
}
return pic_str_cstr(str);
}
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noreturn static pic_value
native_exception_handler(pic_state *pic)
{
pic_value err;
struct pic_proc *cont;
pic_get_args(pic, "o", &err);
pic->err = err;
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cont = pic_proc_ptr(pic_attr_ref(pic, pic_obj_value(pic_get_proc(pic)), "@@escape"));
pic_apply1(pic, cont, pic_false_value());
UNREACHABLE();
}
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void
pic_push_try(pic_state *pic, struct pic_escape *escape)
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{
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struct pic_proc *cont, *handler;
size_t xp_len, xp_offset;
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cont = pic_make_econt(pic, escape);
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handler = pic_make_proc(pic, native_exception_handler, "(native-exception-handler)");
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pic_attr_set(pic, pic_obj_value(handler), "@@escape", pic_obj_value(cont));
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if (pic->xp >= pic->xpend) {
xp_len = (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;
}
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*pic->xp++ = handler;
}
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void
pic_pop_try(pic_state *pic)
{
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pic_value cont, escape;
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assert(pic->xp > pic->xpbase);
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cont = pic_attr_ref(pic, pic_obj_value(*--pic->xp), "@@escape");
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assert(pic_proc_p(cont));
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escape = pic_attr_ref(pic, cont, "@@escape");
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assert(pic_data_p(escape));
((struct pic_escape *)pic_data_ptr(escape)->data)->valid = false;
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}
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struct pic_error *
pic_make_error(pic_state *pic, pic_sym type, const char *msg, pic_value irrs)
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{
struct pic_error *e;
pic_str *stack;
stack = pic_get_backtrace(pic);
e = (struct pic_error *)pic_obj_alloc(pic, sizeof(struct pic_error), PIC_TT_ERROR);
e->type = type;
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e->msg = pic_make_str_cstr(pic, msg);
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e->irrs = irrs;
e->stack = stack;
return e;
}
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pic_value
pic_raise_continuable(pic_state *pic, pic_value err)
{
struct pic_proc *handler;
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pic_value v;
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if (pic->xp == pic->xpbase) {
pic_panic(pic, "no exception handler registered");
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}
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handler = *--pic->xp;
pic_gc_protect(pic, pic_obj_value(handler));
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v = pic_apply1(pic, handler, err);
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*pic->xp++ = handler;
return v;
}
noreturn void
pic_raise(pic_state *pic, pic_value err)
{
pic_value val;
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val = pic_raise_continuable(pic, err);
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pic_pop_try(pic);
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pic_errorf(pic, "error handler returned with ~s on error ~s", val, err);
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}
noreturn void
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pic_throw(pic_state *pic, pic_sym type, const char *msg, pic_value irrs)
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{
struct pic_error *e;
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e = pic_make_error(pic, type, msg, irrs);
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pic_raise(pic, pic_obj_value(e));
}
noreturn void
pic_error(pic_state *pic, const char *msg, pic_value irrs)
{
pic_throw(pic, pic_intern_cstr(pic, ""), msg, irrs);
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}
static pic_value
pic_error_with_exception_handler(pic_state *pic)
{
struct pic_proc *handler, *thunk;
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pic_value val;
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size_t xp_len, xp_offset;
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pic_get_args(pic, "ll", &handler, &thunk);
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if (pic->xp >= pic->xpend) {
xp_len = (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;
}
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*pic->xp++ = handler;
val = pic_apply0(pic, thunk);
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--pic->xp;
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return val;
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}
noreturn static pic_value
pic_error_raise(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
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pic_raise(pic, v);
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}
static pic_value
pic_error_raise_continuable(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
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return pic_raise_continuable(pic, v);
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}
noreturn static pic_value
pic_error_error(pic_state *pic)
{
const char *str;
size_t argc;
pic_value *argv;
pic_get_args(pic, "z*", &str, &argc, &argv);
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pic_error(pic, str, pic_list_by_array(pic, argc, argv));
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}
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static pic_value
pic_error_make_error_object(pic_state *pic)
{
struct pic_error *e;
pic_sym type;
pic_str *msg;
size_t argc;
pic_value *argv;
pic_get_args(pic, "ms*", &type, &msg, &argc, &argv);
e = pic_make_error(pic, type, pic_str_cstr(msg), pic_list_by_array(pic, argc, argv));
return pic_obj_value(e);
}
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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_error_p(v));
}
static pic_value
pic_error_error_object_message(pic_state *pic)
{
struct pic_error *e;
pic_get_args(pic, "e", &e);
return pic_obj_value(e->msg);
}
static pic_value
pic_error_error_object_irritants(pic_state *pic)
{
struct pic_error *e;
pic_get_args(pic, "e", &e);
return e->irrs;
}
static pic_value
pic_error_error_object_type(pic_state *pic)
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{
struct pic_error *e;
pic_get_args(pic, "e", &e);
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return pic_sym_value(e->type);
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}
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);
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pic_defun(pic, "make-error-object", pic_error_make_error_object);
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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);
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}