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emit error message when compiling a reference to a closed variable

This commit is contained in:
Yuichi Nishiwaki 2013-10-17 13:38:09 +09:00
parent 840593f5f3
commit 3ecfe821e2
1 changed files with 11 additions and 1 deletions
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10
src/vm.c
View File

@ -26,6 +26,7 @@ pic_assq(pic_state *pic, pic_value key, pic_value assoc)
enum scope_type {
SCOPE_GLOBAL,
SCOPE_NONLOCAL,
SCOPE_LOCAL,
};
@ -33,6 +34,7 @@ static enum scope_type
env_lookup(pic_state *pic, pic_value sym, struct pic_env *env, struct pic_pair **p)
{
pic_value v;
bool f = true;
enter:
@ -41,6 +43,7 @@ env_lookup(pic_state *pic, pic_value sym, struct pic_env *env, struct pic_pair *
*p = pic_pair_ptr(v);
goto leave;
}
f = false;
if (env->parent) {
env = env->parent;
goto enter;
@ -51,8 +54,13 @@ env_lookup(pic_state *pic, pic_value sym, struct pic_env *env, struct pic_pair *
leave:
if (env->parent) {
if (f) {
return SCOPE_LOCAL;
}
else {
return SCOPE_NONLOCAL;
}
}
else {
return SCOPE_GLOBAL;
}
@ -250,6 +258,8 @@ pic_gen(pic_state *pic, struct pic_irep *irep, pic_value obj, struct pic_env *en
irep->code[irep->clen].u.gvar = gvar;
irep->clen++;
break;
case SCOPE_NONLOCAL:
pic_raise(pic, "reference to closed variable not supported");
}
break;
}