NPTRS is the number of pointers we can strip off and keep cool.
This is used to permit (for aggr A, aggr B) A, B* to convert to A*,
- but to not permit B** to convert to A**.
-
- This should go away. Callers should use can_convert or something
- similar instead. (jason 17 Apr 1997) */
+ but to not permit B** to convert to A**. */
int
comp_target_types (ttl, ttr, nptrs)
if (TREE_CODE (ttr) != TREE_CODE (ttl))
return 0;
- if (TREE_CODE (ttr) == POINTER_TYPE
- || (TREE_CODE (ttr) == REFERENCE_TYPE))
+ if (TREE_CODE (ttr) == POINTER_TYPE)
{
ttl = TREE_TYPE (ttl);
ttr = TREE_TYPE (ttr);
- if (nptrs > 0 && TREE_CODE (ttr) == POINTER_TYPE)
+ if (nptrs > 0)
{
if (TREE_CODE (ttl) == UNKNOWN_TYPE
|| TREE_CODE (ttr) == UNKNOWN_TYPE)
}
}
+ if (TREE_CODE (ttr) == REFERENCE_TYPE)
+ return comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), nptrs);
if (TREE_CODE (ttr) == ARRAY_TYPE)
return comp_array_types (comp_target_types, ttl, ttr, 0);
else if (TREE_CODE (ttr) == FUNCTION_TYPE || TREE_CODE (ttr) == METHOD_TYPE)
{
- if (pedantic)
- {
- if (comptypes (TREE_TYPE (ttl), TREE_TYPE (ttr), 1) == 0)
+ if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), -1))
+ switch (comp_target_parms (TYPE_ARG_TYPES (ttl),
+ TYPE_ARG_TYPES (ttr), 1))
+ {
+ case 0:
return 0;
- }
+ case 1:
+ return 1;
+ case 2:
+ return -1;
+ default:
+ my_friendly_abort (112);
+ }
else
- {
- if (comp_target_types (TREE_TYPE (ttl), TREE_TYPE (ttr), -1) == 0)
- return 0;
- }
-
- return comp_target_parms (TYPE_ARG_TYPES (ttl),
- TYPE_ARG_TYPES (ttr), 1);
+ return 0;
}
/* for C++ */
else if (TREE_CODE (ttr) == OFFSET_TYPE)
If either list is empty, we win.
Otherwise, the two lists must be equivalent, element by element.
- C++: See comment above about TYPE1, TYPE2.
-
- STRICT is no longer used. */
+ C++: See comment above about TYPE1, TYPE2, STRICT.
+ If STRICT == 3, it means checking is strict, but do not compare
+ default parameter values. */
int
compparms (parms1, parms2, strict)
/* An unspecified parmlist matches any specified parmlist
whose argument types don't need default promotions. */
+ if (strict <= 0 && t1 == 0)
+ return self_promoting_args_p (t2);
+ if (strict < 0 && t2 == 0)
+ return self_promoting_args_p (t1);
+
while (1)
{
if (t1 == 0 && t2 == 0)
return 1;
/* If one parmlist is shorter than the other,
- they fail to match. */
+ they fail to match, unless STRICT is <= 0. */
if (t1 == 0 || t2 == 0)
- return 0;
- if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), 1))
- return 0;
+ {
+ if (strict > 0)
+ return 0;
+ if (strict < 0)
+ return 1;
+ if (strict == 0)
+ return t1 && TREE_PURPOSE (t1);
+ }
+ if (! comptypes (TREE_VALUE (t2), TREE_VALUE (t1), strict))
+ {
+ if (strict > 0)
+ return 0;
+ if (strict == 0)
+ return t2 == void_list_node && TREE_PURPOSE (t1);
+ return TREE_PURPOSE (t1) || TREE_PURPOSE (t2);
+ }
t1 = TREE_CHAIN (t1);
t2 = TREE_CHAIN (t2);
}
/* This really wants return whether or not parameter type lists
- would make their owning functions assignment compatible or not.
-
- The return value is like for comp_target_types.
-
- This should go away, possibly with the exception of the empty parmlist
- conversion; there are no conversions between function types in C++.
- (jason 17 Apr 1997) */
+ would make their owning functions assignment compatible or not. */
static int
comp_target_parms (parms1, parms2, strict)
register tree t1 = parms1, t2 = parms2;
int warn_contravariance = 0;
- /* In C, an unspecified parmlist matches any specified parmlist
- whose argument types don't need default promotions. This is not
- true for C++, but let's do it anyway for unfixed headers. */
+ /* An unspecified parmlist matches any specified parmlist
+ whose argument types don't need default promotions.
+ @@@ see 13.3.3 for a counterexample... */
if (t1 == 0 && t2 != 0)
{
}
p1 = TREE_VALUE (t1);
p2 = TREE_VALUE (t2);
- if (comptypes (p1, p2, 1))
+ if (p1 == p2)
continue;
- if (pedantic)
- return 0;
-
if ((TREE_CODE (p1) == POINTER_TYPE && TREE_CODE (p2) == POINTER_TYPE)
|| (TREE_CODE (p1) == REFERENCE_TYPE
&& TREE_CODE (p2) == REFERENCE_TYPE))
}
if (IS_AGGR_TYPE (TREE_TYPE (p1)))
{
- if (comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (p1)),
- TYPE_MAIN_VARIANT (TREE_TYPE (p2)), 1) == 0)
- return 0;
+ if (comptypes (p2, p1, 0) == 0)
+ {
+ if (comptypes (p1, p2, 0) != 0)
+ warn_contravariance = 1;
+ else
+ return 0;
+ }
+ continue;
}
}
/* Note backwards order due to contravariance. */
- if (comp_target_types (p2, p1, 1) <= 0)
+ if (comp_target_types (p2, p1, 1) == 0)
{
- if (comp_target_types (p1, p2, 1) > 0)
+ if (comp_target_types (p1, p2, 1))
{
warn_contravariance = 1;
continue;
if (strict != 0)
return 0;
}
+ /* Target types are compatible--just make sure that if
+ we use parameter lists, that they are ok as well. */
+ if (TREE_CODE (p1) == FUNCTION_TYPE || TREE_CODE (p1) == METHOD_TYPE)
+ switch (comp_target_parms (TYPE_ARG_TYPES (p1),
+ TYPE_ARG_TYPES (p2),
+ strict))
+ {
+ case 0:
+ return 0;
+ case 1:
+ break;
+ case 2:
+ warn_contravariance = 1;
+ }
+
+ if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
+ {
+ int cmp = simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2));
+ if (cmp < 0)
+ my_friendly_abort (114);
+ if (cmp == 0)
+ return 0;
+ }
}
- return warn_contravariance ? -1 : 1;
+ return 1 + warn_contravariance;
}
/* Return 1 if PARMS specifies a fixed number of parameters
{
tree ttl = TYPE_PTRMEMFUNC_FN_TYPE (type);
tree ttr = (TREE_CODE (rhstype) == POINTER_TYPE ? rhstype
- : TYPE_PTRMEMFUNC_FN_TYPE (rhstype));
+ : TYPE_PTRMEMFUNC_FN_TYPE (type));
int ctt = comp_target_types (ttl, ttr, 1);
if (ctt < 0)
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