[gcc r14-7222] c++, demangle: Implement https://github.com/itanium-cxx-abi/cxx-abi/issues/148 non-proposal
Jakub Jelinek
jakub@gcc.gnu.org
Sat Jan 13 09:24:49 GMT 2024
https://gcc.gnu.org/g:65388b28656d65595bdaf191df85af81c35ca638
commit r14-7222-g65388b28656d65595bdaf191df85af81c35ca638
Author: Jakub Jelinek <jakub@redhat.com>
Date: Sat Jan 13 10:23:53 2024 +0100
c++, demangle: Implement https://github.com/itanium-cxx-abi/cxx-abi/issues/148 non-proposal
The following patch attempts to implement what apparently clang++
implemented for explicit object member function mangling, but nobody
actually proposed in patch form in
https://github.com/itanium-cxx-abi/cxx-abi/issues/148
2024-01-13 Jakub Jelinek <jakub@redhat.com>
gcc/cp/
* mangle.cc (write_nested_name): Mangle explicit object
member functions with H as per
https://github.com/itanium-cxx-abi/cxx-abi/issues/148 non-proposal.
gcc/testsuite/
* g++.dg/abi/mangle79.C: New test.
include/
* demangle.h (enum demangle_component_type): Add
DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION.
libiberty/
* cp-demangle.c (FNQUAL_COMPONENT_CASE): Add case for
DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION.
(d_dump): Handle DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION.
(d_nested_name): Parse H after N in nested name.
(d_count_templates_scopes): Handle
DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION.
(d_print_mod): Likewise.
(d_print_function_type): Likewise.
* testsuite/demangle-expected: Add tests for explicit object
member functions.
Diff:
---
gcc/cp/mangle.cc | 3 ++
gcc/testsuite/g++.dg/abi/mangle79.C | 61 +++++++++++++++++++++++++++++++++++
include/demangle.h | 2 ++
libiberty/cp-demangle.c | 39 ++++++++++++++++++----
libiberty/testsuite/demangle-expected | 9 ++++++
5 files changed, 107 insertions(+), 7 deletions(-)
diff --git a/gcc/cp/mangle.cc b/gcc/cp/mangle.cc
index 7d8f443f85c..a04bc584586 100644
--- a/gcc/cp/mangle.cc
+++ b/gcc/cp/mangle.cc
@@ -1247,6 +1247,9 @@ write_nested_name (const tree decl)
write_char ('R');
}
}
+ else if (DECL_DECLARES_FUNCTION_P (decl)
+ && DECL_XOBJ_MEMBER_FUNCTION_P (decl))
+ write_char ('H');
/* Is this a template instance? */
if (tree info = maybe_template_info (decl))
diff --git a/gcc/testsuite/g++.dg/abi/mangle79.C b/gcc/testsuite/g++.dg/abi/mangle79.C
new file mode 100644
index 00000000000..99ae822201e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/abi/mangle79.C
@@ -0,0 +1,61 @@
+// { dg-do compile { target c++11 } }
+// { dg-options "" }
+
+struct S {
+ static void foo (S);
+ void foo (this S); // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+ template <int N, typename T>
+ static void bar (S, T);
+ template <int N, typename T>
+ void bar (this S, T); // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+ static void baz (const S &);
+ void baz (this const S &); // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+};
+
+void
+S::foo (S)
+{
+}
+
+void
+S::foo (this S) // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+{
+}
+
+template <int N, typename T>
+void
+S::bar (S, T)
+{
+}
+
+template <int N, typename T>
+void
+S::bar (this S, T) // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+{
+}
+
+void
+S::baz (const S &)
+{
+}
+
+void
+S::baz (this const S &) // { dg-warning "explicit object member function only available with" "" { target c++20_down } }
+{
+}
+
+void
+qux (S *p)
+{
+ S::foo (*p);
+ p->foo ();
+ S::bar <5> (*p, 0);
+ p->bar <5> (0);
+}
+
+// { dg-final { scan-assembler "_ZN1S3fooES_" } }
+// { dg-final { scan-assembler "_ZNH1S3fooES_" } }
+// { dg-final { scan-assembler "_ZN1S3barILi5EiEEvS_T0_" } }
+// { dg-final { scan-assembler "_ZNH1S3barILi5EiEEvS_T0_" } }
+// { dg-final { scan-assembler "_ZN1S3bazERKS_" } }
+// { dg-final { scan-assembler "_ZNH1S3bazERKS_" } }
diff --git a/include/demangle.h b/include/demangle.h
index 6a03f4f4f93..49b84d4de88 100644
--- a/include/demangle.h
+++ b/include/demangle.h
@@ -314,6 +314,8 @@ enum demangle_component_type
/* C++11: An rvalue reference modifying a member function. The one
subtree is the type which is being referenced. */
DEMANGLE_COMPONENT_RVALUE_REFERENCE_THIS,
+ /* C++23: A member function with explict object parameter. */
+ DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION,
/* A vendor qualifier. The left subtree is the type which is being
qualified, and the right subtree is the name of the
qualifier. */
diff --git a/libiberty/cp-demangle.c b/libiberty/cp-demangle.c
index dee36173896..fc2cf64e6e0 100644
--- a/libiberty/cp-demangle.c
+++ b/libiberty/cp-demangle.c
@@ -581,6 +581,7 @@ static char *d_demangle (const char *, int, size_t *);
case DEMANGLE_COMPONENT_CONST_THIS: \
case DEMANGLE_COMPONENT_REFERENCE_THIS: \
case DEMANGLE_COMPONENT_RVALUE_REFERENCE_THIS: \
+ case DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION: \
case DEMANGLE_COMPONENT_TRANSACTION_SAFE: \
case DEMANGLE_COMPONENT_NOEXCEPT: \
case DEMANGLE_COMPONENT_THROW_SPEC
@@ -749,6 +750,9 @@ d_dump (struct demangle_component *dc, int indent)
case DEMANGLE_COMPONENT_RVALUE_REFERENCE_THIS:
printf ("rvalue reference this\n");
break;
+ case DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION:
+ printf ("explicit object parameter\n");
+ break;
case DEMANGLE_COMPONENT_TRANSACTION_SAFE:
printf ("transaction_safe this\n");
break;
@@ -1547,6 +1551,8 @@ d_name (struct d_info *di, int substable)
/* <nested-name> ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E
::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix> <template-args> E
+ ::= N H <prefix> <unqualified-name> E
+ ::= N H <template-prefix> <template-args> E
*/
static struct demangle_component *
@@ -1559,13 +1565,24 @@ d_nested_name (struct d_info *di)
if (! d_check_char (di, 'N'))
return NULL;
- pret = d_cv_qualifiers (di, &ret, 1);
- if (pret == NULL)
- return NULL;
+ if (d_peek_char (di) == 'H')
+ {
+ d_advance (di, 1);
+ di->expansion += sizeof "this";
+ pret = &ret;
+ rqual = d_make_comp (di, DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION,
+ NULL, NULL);
+ }
+ else
+ {
+ pret = d_cv_qualifiers (di, &ret, 1);
+ if (pret == NULL)
+ return NULL;
- /* Parse the ref-qualifier now and then attach it
- once we have something to attach it to. */
- rqual = d_ref_qualifier (di, NULL);
+ /* Parse the ref-qualifier now and then attach it
+ once we have something to attach it to. */
+ rqual = d_ref_qualifier (di, NULL);
+ }
*pret = d_prefix (di, 1);
if (*pret == NULL)
@@ -4427,6 +4444,7 @@ d_count_templates_scopes (struct d_print_info *dpi,
case DEMANGLE_COMPONENT_CONST_THIS:
case DEMANGLE_COMPONENT_REFERENCE_THIS:
case DEMANGLE_COMPONENT_RVALUE_REFERENCE_THIS:
+ case DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION:
case DEMANGLE_COMPONENT_TRANSACTION_SAFE:
case DEMANGLE_COMPONENT_NOEXCEPT:
case DEMANGLE_COMPONENT_THROW_SPEC:
@@ -6521,6 +6539,8 @@ d_print_mod (struct d_print_info *dpi, int options,
case DEMANGLE_COMPONENT_RVALUE_REFERENCE:
d_append_string (dpi, "&&");
return;
+ case DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION:
+ return;
case DEMANGLE_COMPONENT_COMPLEX:
d_append_string (dpi, " _Complex");
return;
@@ -6559,11 +6579,13 @@ d_print_function_type (struct d_print_info *dpi, int options,
{
int need_paren;
int need_space;
+ int xobj_memfn;
struct d_print_mod *p;
struct d_print_mod *hold_modifiers;
need_paren = 0;
need_space = 0;
+ xobj_memfn = 0;
for (p = mods; p != NULL; p = p->next)
{
if (p->printed)
@@ -6586,7 +6608,8 @@ d_print_function_type (struct d_print_info *dpi, int options,
need_space = 1;
need_paren = 1;
break;
- FNQUAL_COMPONENT_CASE:
+ case DEMANGLE_COMPONENT_XOBJ_MEMBER_FUNCTION:
+ xobj_memfn = 1;
break;
default:
break;
@@ -6617,6 +6640,8 @@ d_print_function_type (struct d_print_info *dpi, int options,
d_append_char (dpi, ')');
d_append_char (dpi, '(');
+ if (xobj_memfn)
+ d_append_string (dpi, "this ");
if (d_right (dc) != NULL)
d_print_comp (dpi, options, d_right (dc));
diff --git a/libiberty/testsuite/demangle-expected b/libiberty/testsuite/demangle-expected
index 0997e96ea43..0f7b97a6d0a 100644
--- a/libiberty/testsuite/demangle-expected
+++ b/libiberty/testsuite/demangle-expected
@@ -1700,3 +1700,12 @@ void f<int>() requires C<int>
# requires after ()
_Z1fIiEvvQ1CIT_E
void f<int>() requires C<int>
+
+_ZNH1S3fooES_
+S::foo(this S)
+
+_ZNH1S3barILi5EiEEvS_T0_
+void S::bar<5, int>(this S, int)
+
+_ZNH1S3bazERKS_
+S::baz(this S const&)
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