304 lines
6.2 KiB
C
304 lines
6.2 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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#include "object.h"
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#include "state.h"
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void
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pic_panic(pic_state *pic, const char *msg)
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{
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if (pic->panicf) {
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pic->panicf(pic, msg);
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}
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PIC_ABORT(pic);
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PIC_UNREACHABLE();
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}
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void
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pic_warnf(pic_state *pic, const char *fmt, ...)
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{
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va_list ap;
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pic_value err;
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va_start(ap, fmt);
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err = pic_vstrf_value(pic, fmt, ap);
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va_end(ap);
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pic_fprintf(pic, pic_stderr(pic), "warn: %s\n", pic_str(pic, err, NULL));
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}
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static pic_value
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native_exception_handler(pic_state *pic)
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{
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pic_value err;
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pic_get_args(pic, "o", &err);
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pic->err = err;
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pic_call(pic, pic_closure_ref(pic, 0), 1, pic_false_value(pic));
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PIC_UNREACHABLE();
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}
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static pic_value
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dynamic_set(pic_state *pic)
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{
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pic_value var, val;
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pic_get_args(pic, "");
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var = pic_closure_ref(pic, 0);
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val = pic_closure_ref(pic, 1);
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pic_proc_ptr(pic, var)->locals[0] = val;
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return pic_undef_value(pic);
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}
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pic_value
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pic_start_try(pic_state *pic, PIC_JMPBUF *jmp)
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{
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struct cont *cont;
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pic_value handler;
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pic_value var, old_val, new_val;
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pic_value in, out;
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struct checkpoint *here;
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/* call/cc */
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cont = pic_alloca_cont(pic);
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pic_save_point(pic, cont, jmp);
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handler = pic_lambda(pic, native_exception_handler, 1, pic_make_cont(pic, cont));
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/* with-exception-handler */
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var = pic_ref(pic, "picrin.base", "current-exception-handlers");
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old_val = pic_call(pic, var, 0);
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new_val = pic_cons(pic, handler, old_val);
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in = pic_lambda(pic, dynamic_set, 2, var, new_val);
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out = pic_lambda(pic, dynamic_set, 2, var, old_val);
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/* dynamic-wind */
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pic_call(pic, in, 0); /* enter */
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here = pic->cp;
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pic->cp = (struct checkpoint *)pic_obj_alloc(pic, sizeof(struct checkpoint), PIC_TYPE_CP);
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pic->cp->prev = here;
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pic->cp->depth = here->depth + 1;
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pic->cp->in = pic_proc_ptr(pic, in);
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pic->cp->out = pic_proc_ptr(pic, out);
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return pic_cons(pic, obj_value(pic, here), out);
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}
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void
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pic_end_try(pic_state *pic, pic_value cookie)
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{
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struct checkpoint *here = pic_cp_ptr(pic, pic_car(pic, cookie));
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pic_value out = pic_cdr(pic, cookie);
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pic->cp = here;
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pic_call(pic, out, 0); /* exit */
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pic_exit_point(pic);
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}
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pic_value
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pic_err(pic_state *pic)
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{
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return pic->err;
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}
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pic_value
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pic_make_error(pic_state *pic, const char *type, const char *msg, pic_value irrs)
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{
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struct error *e;
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pic_value stack, ty = pic_intern_cstr(pic, type);
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stack = pic_get_backtrace(pic);
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e = (struct error *)pic_obj_alloc(pic, sizeof(struct error), PIC_TYPE_ERROR);
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e->type = pic_sym_ptr(pic, ty);
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e->msg = pic_str_ptr(pic, pic_cstr_value(pic, msg));
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e->irrs = irrs;
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e->stack = pic_str_ptr(pic, stack);
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return obj_value(pic, e);
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}
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pic_value pic_raise_continuable(pic_state *, pic_value err);
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void
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pic_error(pic_state *pic, const char *msg, int n, ...)
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{
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va_list ap;
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pic_value irrs;
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va_start(ap, n);
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irrs = pic_vlist(pic, n, ap);
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va_end(ap);
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pic_raise(pic, pic_make_error(pic, "", msg, irrs));
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}
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static pic_value
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raise_action(pic_state *pic)
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{
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pic_get_args(pic, "");
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pic_call(pic, pic_closure_ref(pic, 0), 1, pic_closure_ref(pic, 1));
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pic_error(pic, "handler returned", 2, pic_closure_ref(pic, 0), pic_closure_ref(pic, 1));
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}
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void
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pic_raise(pic_state *pic, pic_value err)
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{
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pic_value stack, exc = pic_ref(pic, "picrin.base", "current-exception-handlers");
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stack = pic_call(pic, exc, 0);
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if (pic_nil_p(pic, stack)) {
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pic_panic(pic, "no exception handler");
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}
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pic_dynamic_bind(pic, exc, pic_cdr(pic, stack), pic_lambda(pic, raise_action, 2, pic_car(pic, stack), err));
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PIC_UNREACHABLE();
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}
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static pic_value
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raise_continuable(pic_state *pic)
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{
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pic_get_args(pic, "");
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return pic_call(pic, pic_closure_ref(pic, 0), 1, pic_closure_ref(pic, 1));
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}
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pic_value
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pic_raise_continuable(pic_state *pic, pic_value err)
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{
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pic_value stack, exc = pic_ref(pic, "picrin.base", "current-exception-handlers");
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stack = pic_call(pic, exc, 0);
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if (pic_nil_p(pic, stack)) {
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pic_panic(pic, "no exception handler");
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}
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return pic_dynamic_bind(pic, exc, pic_cdr(pic, stack), pic_lambda(pic, raise_continuable, 2, pic_car(pic, stack), err));
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}
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static pic_value
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pic_error_with_exception_handler(pic_state *pic)
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{
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pic_value handler, thunk;
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pic_value stack, exc = pic_ref(pic, "picrin.base", "current-exception-handlers");
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pic_get_args(pic, "ll", &handler, &thunk);
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stack = pic_call(pic, exc, 0);
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return pic_dynamic_bind(pic, exc, pic_cons(pic, handler, stack), thunk);
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}
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static pic_value
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pic_error_raise(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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pic_raise(pic, v);
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}
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static pic_value
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pic_error_raise_continuable(pic_state *pic)
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{
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pic_value v;
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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)
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{
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const char *str;
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int argc;
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pic_value *argv;
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pic_get_args(pic, "z*", &str, &argc, &argv);
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pic_raise(pic, pic_make_error(pic, "", str, pic_make_list(pic, argc, argv)));
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}
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static pic_value
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pic_error_error_object_p(pic_state *pic)
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{
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pic_value v;
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pic_get_args(pic, "o", &v);
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return pic_bool_value(pic, pic_error_p(pic, v));
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}
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static pic_value
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pic_error_error_object_message(pic_state *pic)
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{
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pic_value e;
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pic_get_args(pic, "o", &e);
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TYPE_CHECK(pic, e, error);
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return obj_value(pic, pic_error_ptr(pic, e)->msg);
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}
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static pic_value
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pic_error_error_object_irritants(pic_state *pic)
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{
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pic_value e;
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pic_get_args(pic, "o", &e);
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TYPE_CHECK(pic, e, error);
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return pic_error_ptr(pic, e)->irrs;
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}
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static pic_value
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pic_error_error_object_type(pic_state *pic)
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{
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pic_value e;
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pic_get_args(pic, "o", &e);
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TYPE_CHECK(pic, e, error);
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return obj_value(pic, pic_error_ptr(pic, e)->type);
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}
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void
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pic_init_error(pic_state *pic)
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{
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pic_defvar(pic, "current-exception-handlers", pic_nil_value(pic));
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pic_defun(pic, "with-exception-handler", pic_error_with_exception_handler);
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pic_defun(pic, "raise", pic_error_raise);
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pic_defun(pic, "raise-continuable", pic_error_raise_continuable);
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pic_defun(pic, "error", pic_error_error);
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pic_defun(pic, "error-object?", pic_error_error_object_p);
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pic_defun(pic, "error-object-message", pic_error_error_object_message);
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pic_defun(pic, "error-object-irritants", pic_error_error_object_irritants);
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pic_defun(pic, "error-object-type", pic_error_error_object_type);
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}
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