picrin/extlib/benz/error.c

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C
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/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
void
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pic_panic(pic_state PIC_UNUSED(*pic), const char *msg)
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{
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extern PIC_NORETURN void abort();
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#if DEBUG
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fprintf(stderr, "abort: %s\n", msg);
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#else
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(void)msg;
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#endif
PIC_ABORT(pic);
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}
void
pic_warnf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
struct pic_string *err;
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va_start(ap, fmt);
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err = pic_vformat(pic, fmt, ap);
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va_end(ap);
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xfprintf(pic, pic_stderr(pic)->file, "warn: %s\n", pic_str_cstr(pic, err));
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}
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void
pic_errorf(pic_state *pic, const char *fmt, ...)
{
va_list ap;
const char *msg;
struct pic_string *err;
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va_start(ap, fmt);
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err = pic_vformat(pic, fmt, ap);
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va_end(ap);
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msg = pic_str_cstr(pic, err);
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pic_error(pic, msg, pic_nil_value());
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}
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pic_value
pic_native_exception_handler(pic_state *pic)
{
pic_value err;
struct pic_proc *self, *cont;
pic_get_args(pic, "&o", &self, &err);
pic->err = err;
cont = pic_proc_ptr(pic_closure_ref(pic, 0));
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pic_call(pic, cont, 1, pic_false_value());
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PIC_UNREACHABLE();
}
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void
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pic_push_handler(pic_state *pic, struct pic_proc *handler)
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{
size_t xp_len;
ptrdiff_t xp_offset;
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if (pic->xp >= pic->xpend) {
xp_len = (size_t)(pic->xpend - pic->xpbase) * 2;
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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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struct pic_proc *
pic_pop_handler(pic_state *pic)
{
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if (pic->xp == pic->xpbase) {
pic_panic(pic, "no exception handler registered");
}
return *--pic->xp;
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}
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struct pic_error *
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pic_make_error(pic_state *pic, pic_sym *type, const char *msg, pic_value irrs)
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{
struct pic_error *e;
struct pic_string *stack;
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stack = pic_get_backtrace(pic);
e = (struct pic_error *)pic_obj_alloc(pic, sizeof(struct pic_error), PIC_TT_ERROR);
e->type = type;
e->msg = pic_make_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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handler = pic_pop_handler(pic);
pic_gc_protect(pic, pic_obj_value(handler));
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v = pic_call(pic, handler, 1, err);
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pic_push_handler(pic, handler);
return v;
}
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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_handler(pic);
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pic_errorf(pic, "error handler returned with ~s on error ~s", val, err);
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}
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void
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pic_error(pic_state *pic, const char *msg, pic_value irrs)
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{
struct pic_error *e;
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e = pic_make_error(pic, pic_intern_lit(pic, ""), msg, irrs);
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pic_raise(pic, pic_obj_value(e));
}
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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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pic_get_args(pic, "ll", &handler, &thunk);
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pic_push_handler(pic, handler);
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val = pic_call(pic, thunk, 0);
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pic_pop_handler(pic);
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return val;
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}
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static pic_value
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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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}
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static pic_value
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pic_error_error(pic_state *pic)
{
const char *str;
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int argc;
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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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}
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_obj_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);
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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}