On Fri, Oct 07, 2022 at 12:17:34PM -0400, Jason Merrill wrote:
> On 10/6/22 22:12, Marek Polacek wrote:
> > On Thu, Oct 06, 2022 at 05:42:41PM -0400, Jason Merrill wrote:
> > > On 10/4/22 19:06, Marek Polacek wrote:
> > > > On Fri, Sep 30, 2022 at 09:12:24AM -0400, Jason Merrill wrote:
> > > > > On 9/29/22 18:49, Marek Polacek wrote:
> > > > > > When getting the name of an attribute, we ought to use
> > > > > > get_attribute_name, which handles both [[ ]] and __attribute__(())
> > > > > > forms. Failure to do so may result in an ICE, like here.
> > > > > >
> > > > > > Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
> > > > >
> > > > > How do we print the attributes with this patch? Don't we also want
> > > > > to print
> > > > > the namespace, and use [[]] in the output?
> > > >
> > > > Good point, however: while the testcase indeed has an attribute
> > > > in the [[]] form in the typedef, here we're printing its "aka":
> > > >
> > > > warning: initialization of 'FuncPointerWithNoCfCheck' {aka 'void
> > > > (__attribute__((nocf_check)) *)(void)'} from incompatible pointer type
> > > > 'FuncPointer' {aka 'void (*)(void)'}
> > > >
> > > > c-pretty-print.cc doesn't seem to know how to print an [[]] attribute.
> > > > I could do that, but then we'd print
> > > >
> > > > aka 'void ([[nocf_check]] *)(void)'
> > > >
> > > > in the above, but that's invalid syntax!
> > >
> > > Indeed, it should be
> > >
> > > void (* [[gnu::nocf_check]])(void)
> >
> > Ok, let me fix that too, then. I've updated the description to show
> > what we print with the patch, and what was printed before.
>
> Oops, apparently I was wrongly assuming that the attribute appertained to
> the pointer.
So was I :/.
> Since it actually appertains to the function type, it should
> be
>
> void (*)(void) [[gnu::nocf_check]].
>
> But for GCC attribute syntax, I think we want to leave the __attribute__
> where it was before, as in the manual's example
>
> void (__attribute__((noreturn)) ****f) (void);
Thanks, done here:
Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
-- >8 --
When getting the name of an attribute, we ought to use
get_attribute_name, which handles both [[]] and __attribute__(())
forms. Failure to do so may result in an ICE, like here.
pp_c_attributes_display wasn't able to print the [[]] form of
attributes, so this patch teaches it to.
When printing a pointer to function with a standard attribute, the attribute
should be printed after the parameter-list. With this patch we print:
aka 'void (*)(int) [[gnu::nocf_check]]'
pp_c_attributes has been unused since its introduction in r56273 so
this patch removes it.
PR c++/106937
gcc/c-family/ChangeLog:
* c-pretty-print.cc (pp_c_specifier_qualifier_list): Only print
GNU attributes here.
(c_pretty_printer::abstract_declarator): For a pointer to function,
print the standard [[]] attributes here.
(pp_c_attributes): Remove.
(pp_c_attributes_display): Print the [[]] form if appropriate. Use
get_attribute_name. Don't print a trailing space when printing the
[[]] form.
* c-pretty-print.h (pp_c_attributes): Remove.
gcc/cp/ChangeLog:
* error.cc: Include "attribs.h".
(dump_type_prefix): Only print GNU attributes here.
(dump_type_suffix): Print standard attributes here.
gcc/testsuite/ChangeLog:
* c-c++-common/pointer-to-fn1.c: New test.
---
gcc/c-family/c-pretty-print.cc | 102 +++++++++++---------
gcc/c-family/c-pretty-print.h | 1 -
gcc/cp/error.cc | 17 +++-
gcc/testsuite/c-c++-common/pointer-to-fn1.c | 18 ++++
4 files changed, 92 insertions(+), 46 deletions(-)
create mode 100644 gcc/testsuite/c-c++-common/pointer-to-fn1.c
diff --git a/gcc/c-family/c-pretty-print.cc b/gcc/c-family/c-pretty-print.cc
index efa1768f4d6..349f0a07d3e 100644
--- a/gcc/c-family/c-pretty-print.cc
+++ b/gcc/c-family/c-pretty-print.cc
@@ -466,7 +466,12 @@ pp_c_specifier_qualifier_list (c_pretty_printer *pp, tree
t)
{
pp_c_whitespace (pp);
pp_c_left_paren (pp);
- pp_c_attributes_display (pp, TYPE_ATTRIBUTES (pointee));
+ /* If we're dealing with the GNU form of attributes, print this:
+ void (__attribute__((noreturn)) *f) ();
+ If it is the standard [[]] attribute, we'll print the attribute
+ in c_pretty_printer::abstract_declarator. */
+ if (!cxx11_attribute_p (TYPE_ATTRIBUTES (pointee)))
+ pp_c_attributes_display (pp, TYPE_ATTRIBUTES (pointee));
}
else if (!c_dialect_cxx ())
pp_c_whitespace (pp);
@@ -564,15 +569,26 @@ pp_c_parameter_type_list (c_pretty_printer *pp, tree t)
void
c_pretty_printer::abstract_declarator (tree t)
{
+ bool fn_ptr_p = false;
if (TREE_CODE (t) == POINTER_TYPE)
{
if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE
|| TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE)
- pp_c_right_paren (this);
+ {
+ pp_c_right_paren (this);
+ fn_ptr_p = true;
+ }
t = TREE_TYPE (t);
}
direct_abstract_declarator (t);
+ /* If this is the standard [[]] attribute, print
+ void (*)() [[noreturn]]; */
+ if (fn_ptr_p && cxx11_attribute_p (TYPE_ATTRIBUTES (t)))
+ {
+ pp_space (this);
+ pp_c_attributes_display (this, TYPE_ATTRIBUTES (t));
+ }
}
/* direct-abstract-declarator:
@@ -850,32 +866,7 @@ c_pretty_printer::declaration (tree t)
pp_c_init_declarator (this, t);
}
-/* Pretty-print ATTRIBUTES using GNU C extension syntax. */
-
-void
-pp_c_attributes (c_pretty_printer *pp, tree attributes)
-{
- if (attributes == NULL_TREE)
- return;
-
- pp_c_ws_string (pp, "__attribute__");
- pp_c_left_paren (pp);
- pp_c_left_paren (pp);
- for (; attributes != NULL_TREE; attributes = TREE_CHAIN (attributes))
- {
- pp_tree_identifier (pp, TREE_PURPOSE (attributes));
- if (TREE_VALUE (attributes))
- pp_c_call_argument_list (pp, TREE_VALUE (attributes));
-
- if (TREE_CHAIN (attributes))
- pp_separate_with (pp, ',');
- }
- pp_c_right_paren (pp);
- pp_c_right_paren (pp);
-}
-
-/* Pretty-print ATTRIBUTES using GNU C extension syntax for attributes
- marked to be displayed on disgnostic. */
+/* Pretty-print ATTRIBUTES marked to be displayed on diagnostic. */
void
pp_c_attributes_display (c_pretty_printer *pp, tree a)
@@ -885,10 +876,12 @@ pp_c_attributes_display (c_pretty_printer *pp, tree a)
if (a == NULL_TREE)
return;
+ const bool std_p = cxx11_attribute_p (a);
+
for (; a != NULL_TREE; a = TREE_CHAIN (a))
{
- const struct attribute_spec *as;
- as = lookup_attribute_spec (TREE_PURPOSE (a));
+ const struct attribute_spec *as
+ = lookup_attribute_spec (get_attribute_name (a));
if (!as || as->affects_type_identity == false)
continue;
if (c_dialect_cxx ()
@@ -896,26 +889,47 @@ pp_c_attributes_display (c_pretty_printer *pp, tree a)
/* In C++ transaction_safe is printed at the end of the declarator. */
continue;
if (is_first)
- {
- pp_c_ws_string (pp, "__attribute__");
- pp_c_left_paren (pp);
- pp_c_left_paren (pp);
- is_first = false;
- }
+ {
+ if (std_p)
+ {
+ pp_c_left_bracket (pp);
+ pp_c_left_bracket (pp);
+ }
+ else
+ {
+ pp_c_ws_string (pp, "__attribute__");
+ pp_c_left_paren (pp);
+ pp_c_left_paren (pp);
+ }
+ is_first = false;
+ }
else
- {
- pp_separate_with (pp, ',');
- }
- pp_tree_identifier (pp, TREE_PURPOSE (a));
+ pp_separate_with (pp, ',');
+ tree ns;
+ if (std_p && (ns = get_attribute_namespace (a)))
+ {
+ pp_tree_identifier (pp, ns);
+ pp_colon (pp);
+ pp_colon (pp);
+ }
+ pp_tree_identifier (pp, get_attribute_name (a));
if (TREE_VALUE (a))
- pp_c_call_argument_list (pp, TREE_VALUE (a));
+ pp_c_call_argument_list (pp, TREE_VALUE (a));
}
if (!is_first)
{
- pp_c_right_paren (pp);
- pp_c_right_paren (pp);
- pp_c_whitespace (pp);
+ if (std_p)
+ {
+ pp_c_right_bracket (pp);
+ pp_c_right_bracket (pp);
+ }
+ else
+ {
+ pp_c_right_paren (pp);
+ pp_c_right_paren (pp);
+ pp_c_whitespace (pp);
+ }
}
}
diff --git a/gcc/c-family/c-pretty-print.h b/gcc/c-family/c-pretty-print.h
index be86bed4fee..92674ab4d06 100644
--- a/gcc/c-family/c-pretty-print.h
+++ b/gcc/c-family/c-pretty-print.h
@@ -119,7 +119,6 @@ void pp_c_space_for_pointer_operator (c_pretty_printer *,
tree);
/* Declarations. */
void pp_c_tree_decl_identifier (c_pretty_printer *, tree);
void pp_c_function_definition (c_pretty_printer *, tree);
-void pp_c_attributes (c_pretty_printer *, tree);
void pp_c_attributes_display (c_pretty_printer *, tree);
void pp_c_cv_qualifiers (c_pretty_printer *pp, int qualifiers, bool func_type);
void pp_c_type_qualifier_list (c_pretty_printer *, tree);
diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index 4514c8bbb44..8cd011fab0e 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -36,6 +36,7 @@ along with GCC; see the file COPYING3. If not see
#include "internal-fn.h"
#include "gcc-rich-location.h"
#include "cp-name-hint.h"
+#include "attribs.h"
#define pp_separate_with_comma(PP) pp_cxx_separate_with (PP, ',')
#define pp_separate_with_semicolon(PP) pp_cxx_separate_with (PP, ';')
@@ -897,7 +898,12 @@ dump_type_prefix (cxx_pretty_printer *pp, tree t, int
flags)
{
pp_cxx_whitespace (pp);
pp_cxx_left_paren (pp);
- pp_c_attributes_display (pp, TYPE_ATTRIBUTES (sub));
+ /* If we're dealing with the GNU form of attributes, print this:
+ void (__attribute__((noreturn)) *f) ();
+ If it is the standard [[]] attribute, we'll print the attribute
+ in dump_type_suffix. */
+ if (!cxx11_attribute_p (TYPE_ATTRIBUTES (sub)))
+ pp_c_attributes_display (pp, TYPE_ATTRIBUTES (sub));
}
if (TYPE_PTR_P (t))
pp_star (pp);
@@ -1027,6 +1033,15 @@ dump_type_suffix (cxx_pretty_printer *pp, tree t, int
flags)
TREE_CODE (t) == FUNCTION_TYPE
&& (flags & TFF_POINTER));
dump_ref_qualifier (pp, t, flags);
+ /* If this is the standard [[]] attribute, print
+ void (*)() [[noreturn]]; */
+ if ((flags & TFF_POINTER)
+ && cxx11_attribute_p (TYPE_ATTRIBUTES (t)))
+ {
+ pp_space (pp);
+ pp_c_attributes_display (pp, TYPE_ATTRIBUTES (t));
+ pp->padding = pp_before;
+ }
if (tx_safe_fn_type_p (t))
pp_cxx_ws_string (pp, "transaction_safe");
dump_exception_spec (pp, TYPE_RAISES_EXCEPTIONS (t), flags);
diff --git a/gcc/testsuite/c-c++-common/pointer-to-fn1.c
b/gcc/testsuite/c-c++-common/pointer-to-fn1.c
new file mode 100644
index 00000000000..975885462e9
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pointer-to-fn1.c
@@ -0,0 +1,18 @@
+/* PR c++/106937 */
+/* { dg-options "-fcf-protection" } */
+/* { dg-additional-options "-std=c++11 -fpermissive" { target c++ } } */
+/* Test printing a pointer to function with attribute. */
+
+__attribute__((nocf_check)) typedef void (*FPA1)();
+[[gnu::nocf_check]] typedef void (*FPA2)(int);
+typedef void (*FP1)();
+typedef void (*FP2)(int);
+
+void
+g (FP1 f1, FP2 f2)
+{
+ FPA1 p1 = f1; // { dg-warning {aka 'void \(__attribute__\(\(nocf_check\)\)
\*\)\(\)'} }
+ FPA2 p2 = f2; // { dg-warning {aka 'void \(\*\)\(int\)
\[\[gnu::nocf_check\]\]'} }
+ FP1 p3 = p1; // { dg-warning {aka 'void \(__attribute__\(\(nocf_check\)\)
\*\)\(\)'} }
+ FP2 p4 = p2; // { dg-warning {aka 'void \(\*\)\(int\)
\[\[gnu::nocf_check\]\]'} }
+}
base-commit: f30e9fd33e56a5a721346ea6140722e1b193db42
--
2.37.3
