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* call.c (null_ptr_cst_p): Remove support for (void*)0. 

From-SVN: r15022
This commit is contained in:
Jason Merrill 1997-09-01 20:07:22 +00:00 committed by Jason Merrill
parent f3e0ca6c2d
commit 8e69329a82
3 changed files with 53 additions and 10 deletions
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4
gcc/cp/ChangeLog
View File

@ -1,3 +1,7 @@
Thu Aug 28 09:45:23 1997 Jason Merrill <jason@yorick.cygnus.com>
* call.c (null_ptr_cst_p): Remove support for (void*)0.
Wed Aug 27 02:03:34 1997 Jeffrey A Law (law@cygnus.com)
* typeck.c (expand_target_expr): Make definition match declaration.

11
gcc/cp/NEWS
View File

@ -7,7 +7,9 @@
for more information.
* New flags -Wsign-promo, -Wno-pmf-conversion.
* New flags -Wsign-promo (warn about potentially confusing promotions in
overload resolution), -Wno-pmf-conversion (don't warn about converting
from a bound member function pointer to function pointer).
* local static variables in extern inline functions will be shared between
translation units.
@ -65,7 +67,7 @@
already has virtual functions, only if they override a virtual destructor
in a base class. The compiler will warn if this affects your code.
* The g++ driver no longer links with libg++ by default; it is now
* The g++ driver now only links against libstdc++, not libg++; it is
functionally identical to the c++ driver.
* (void *)0 is no longer considered a null pointer constant; NULL in
@ -102,6 +104,11 @@
+ Syntax errors in templates that are never instantiated will now be
diagnosed.
Still not supported:
+ Member templates.
+ Template template parameters.
* Synthesized methods are now emitted in any translation units that need
an out-of-line copy. They are no longer affected by #pragma interface
or #pragma implementation.

48
gcc/cp/call.c
View File

@ -2998,9 +2998,6 @@ null_ptr_cst_p (t)
if (t == null_node
|| integer_zerop (t) && INTEGRAL_TYPE_P (TREE_TYPE (t)))
return 1;
/* Remove this eventually. */
if (! pedantic && TREE_TYPE (t) == ptr_type_node && integer_zerop (t))
return 1;
return 0;
}
@ -3697,7 +3694,7 @@ add_builtin_candidate (candidates, code, code2, fnname, type1, type2,
{
tree c1 = TREE_TYPE (type1);
tree c2 = (TYPE_PTRMEMFUNC_P (type2)
? TYPE_METHOD_BASETYPE (TYPE_PTRMEMFUNC_FN_TYPE (type2))
? TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type2)))
: TYPE_OFFSET_BASETYPE (TREE_TYPE (type2)));
if (IS_AGGR_TYPE (c1) && DERIVED_FROM_P (c2, c1)
@ -5658,8 +5655,8 @@ compare_ics (ics1, ics2)
if (TYPE_PTRMEMFUNC_P (to1))
{
to1 = TYPE_METHOD_BASETYPE (TYPE_PTRMEMFUNC_FN_TYPE (to1));
from1 = TYPE_METHOD_BASETYPE (TYPE_PTRMEMFUNC_FN_TYPE (from1));
to1 = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (to1)));
from1 = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (from1)));
}
else if (TREE_CODE (main1) != BASE_CONV)
{
@ -5676,8 +5673,8 @@ compare_ics (ics1, ics2)
if (TYPE_PTRMEMFUNC_P (to2))
{
to2 = TYPE_METHOD_BASETYPE (TYPE_PTRMEMFUNC_FN_TYPE (to2));
from2 = TYPE_METHOD_BASETYPE (TYPE_PTRMEMFUNC_FN_TYPE (from2));
to2 = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (to2)));
from2 = TYPE_METHOD_BASETYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (from2)));
}
else if (TREE_CODE (main1) != BASE_CONV)
{
@ -5778,6 +5775,20 @@ compare_ics (ics1, ics2)
return 0;
}
static tree
source_type (t)
tree t;
{
for (;; t = TREE_OPERAND (t, 0))
{
if (TREE_CODE (t) == USER_CONV
|| TREE_CODE (t) == AMBIG_CONV
|| TREE_CODE (t) == IDENTITY_CONV)
return TREE_TYPE (t);
}
my_friendly_abort (1823);
}
/* Compare two candidates for overloading as described in
[over.match.best]. Return values:
@ -5868,6 +5879,27 @@ joust (cand1, cand2)
}
}
/* warn about confusing overload resolution */
if (winner && cand1->second_conv
&& ! DECL_CONSTRUCTOR_P (cand1->fn)
&& ! DECL_CONSTRUCTOR_P (cand2->fn))
{
int comp = compare_ics (cand1->second_conv, cand2->second_conv);
if (comp && comp != winner)
{
struct z_candidate *w, *l;
if (winner == 1)
w = cand1, l = cand2;
else
w = cand2, l = cand1;
cp_warning ("choosing `%D' over `%D'", w->fn, l->fn);
cp_warning (" for conversion from `%T' to `%T'",
TREE_TYPE (source_type (TREE_VEC_ELT (w->convs, 0))),
TREE_TYPE (w->second_conv));
cp_warning (" because conversion sequence for `this' argument is better");
}
}
if (winner)
return winner;