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compiler enhancement in checking instance variable access in class methods

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hyung-hwan
2022-02-24 17:16:02 +00:00
parent 151c9e7227
commit 5d20796f4a
1 changed files with 12 additions and 5 deletions
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17
hcl/lib/comp.c
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@ -287,6 +287,8 @@ static int find_variable_backward (hcl_t* hcl, const hcl_cnode_t* token, hcl_var
haystack.len = hcl_count_oocstr(clsbi->ivars_str);
if (__find_word_in_string(&haystack, name, 1, &index) >= 0)
{
hcl_oow_t fi;
if (i >= hcl->c->fnblk.depth)
{
/* instance variables are accessible only in an instance method defintion scope.
@ -295,12 +297,17 @@ static int find_variable_backward (hcl_t* hcl, const hcl_cnode_t* token, hcl_var
return -1;
}
if (hcl->c->fnblk.info[hcl->c->fnblk.depth].fun_type == FUN_CM)
for (fi = hcl->c->fnblk.depth + 1; fi > i; ) /* TOOD: review this loop for correctness */
{
/* TODO: check if it's a block inside a method ... */
/* the function where this variable is defined is a class method */
hcl_setsynerrbfmt (hcl, HCL_SYNERR_BANNED, HCL_CNODE_GET_LOC(token), name, "prohibited access to an instance variable in a class method");
return -1;
if (hcl->c->fnblk.info[--fi].fun_type == FUN_CM)
{
/* the function where this variable is defined is a class method */
hcl_setsynerrbfmt (hcl, HCL_SYNERR_BANNED, HCL_CNODE_GET_LOC(token), name, "prohibited access to an instance variable in a class method");
return -1;
}
/* instance methods and instantiation methods can access instance variables */
if (hcl->c->fnblk.info[fi].fun_type != FUN_PLAIN) break;
}
vi->type = VAR_INST;