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re PR c++/34935 (ICE with attribute may_alias)

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2008-01-31  Douglas Gregor  <doug.gregor@gmail.com>
           Jakub Jelinek  <jakub@redhat.com>

       PR c++/34935
       PR c++/34936
       * typeck.c (structural_comptypes): Handle comparisons of
       VOID_TYPE, BOOLEAN_TYPE, INTEGER_TYPE, FIXED_POINT_TYPE, and
       REAL_TYPE nodes.
       * mangle.c (write_builtin_type): Map down to the canonical type,
       which will be one of the predefined type nodes.

2008-01-31  Douglas Gregor  <doug.gregor@gmail.com>
           Jakub Jelinek  <jakub@redhat.com>

       PR c++/34935
       PR c++/34936
       * g++.dg/ext/alias-canon.C: New.
       * g++.dg/ext/alias-mangle.C: New.
	

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r131984
This commit is contained in:
Douglas Gregor 2008-01-31 20:06:33 +00:00 committed by Doug Gregor
parent 5ca3d30cfb
commit 0451301c59
6 changed files with 98 additions and 0 deletions
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11
gcc/cp/ChangeLog
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@ -1,3 +1,14 @@
2008-01-31 Douglas Gregor <doug.gregor@gmail.com>
Jakub Jelinek <jakub@redhat.com>
PR c++/34935
PR c++/34936
* typeck.c (structural_comptypes): Handle comparisons of
VOID_TYPE, BOOLEAN_TYPE, INTEGER_TYPE, FIXED_POINT_TYPE, and
REAL_TYPE nodes.
* mangle.c (write_builtin_type): Map down to the canonical type,
which will be one of the predefined type nodes.
2008-01-29 Michael Meissner <michael.meissner@amd.com>
PR 35004

3
gcc/cp/mangle.c
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@ -1768,6 +1768,9 @@ write_CV_qualifiers_for_type (const tree type)
static void
write_builtin_type (tree type)
{
if (TYPE_CANONICAL (type))
type = TYPE_CANONICAL (type);
switch (TREE_CODE (type))
{
case VOID_TYPE:

24
gcc/cp/typeck.c
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@ -977,6 +977,30 @@ structural_comptypes (tree t1, tree t2, int strict)
/* Compare the types. Break out if they could be the same. */
switch (TREE_CODE (t1))
{
case VOID_TYPE:
case BOOLEAN_TYPE:
/* All void and bool types are the same. */
break;
case INTEGER_TYPE:
case FIXED_POINT_TYPE:
case REAL_TYPE:
/* With these nodes, we can't determine type equivalence by
looking at what is stored in the nodes themselves, because
two nodes might have different TYPE_MAIN_VARIANTs but still
represent the same type. For example, wchar_t and int could
have the same properties (TYPE_PRECISION, TYPE_MIN_VALUE,
TYPE_MAX_VALUE, etc.), but have different TYPE_MAIN_VARIANTs
and are distinct types. On the other hand, int and the
following typedef
typedef int INT __attribute((may_alias));
have identical properties, different TYPE_MAIN_VARIANTs, but
represent the same type. The canonical type system keeps
track of equivalence in this case, so we fall back on it. */
return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2);
case TEMPLATE_TEMPLATE_PARM:
case BOUND_TEMPLATE_TEMPLATE_PARM:
if (TEMPLATE_TYPE_IDX (t1) != TEMPLATE_TYPE_IDX (t2)

8
gcc/testsuite/ChangeLog
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@ -1,3 +1,11 @@
2008-01-31 Douglas Gregor <doug.gregor@gmail.com>
Jakub Jelinek <jakub@redhat.com>
PR c++/34935
PR c++/34936
* g++.dg/ext/alias-canon.C: New.
* g++.dg/ext/alias-mangle.C: New.
2008-01-30 Jan Hubicka <jh@suse.cz>
* gcc.c-torture/execute/pr34982.c: Add forgotten return 0.

41
gcc/testsuite/g++.dg/ext/alias-canon.C Normal file
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@ -0,0 +1,41 @@
// PR c++/34935
/* { dg-do compile } */
/* { dg-final { scan-assembler "_Z1fi" } } */
/* { dg-final { scan-assembler "_Z1fb" } } */
/* { dg-final { scan-assembler "_Z1fd" } } */
/* { dg-final { scan-assembler "_Z1ff" } } */
/* { dg-final { scan-assembler "_Z1fw" } } */
typedef int INT __attribute((may_alias));
void f(int);
void f(INT) { }
typedef bool BOOL __attribute((may_alias));
void f(bool);
void f(BOOL) { }
typedef float FLOAT __attribute((may_alias));
void f(float);
void f(FLOAT) { }
typedef double DOUBLE __attribute((may_alias));
void f(double);
void f(DOUBLE) {}
typedef wchar_t WCHAR_T __attribute((may_alias));
void f(wchar_t);
void f(WCHAR_T) {}
void test()
{
f(0);
f(true);
f(1.0f);
f(1.0);
f(L'f');
}

11
gcc/testsuite/g++.dg/ext/alias-mangle.C Normal file
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@ -0,0 +1,11 @@
// PR c++/34936
// { dg-do compile }
/* { dg-final { scan-assembler "_ZN1AIdEC1Ev" } } */
typedef double X __attribute((may_alias)) ;
template<typename> struct A
{
A();
};
A<X> a;