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c++: Adjust mangling of __alignof__ [PR88115]

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r11-4926 made __alignof__ get mangled differently from alignof,
encoding __alignof__ as a vendor extended operator.  But this
mangling is problematic for the reasons mentioned in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88115#c6.

This patch changes our mangling of __alignof__ to instead use the
new "vendor extended expression" syntax that's proposed in
https://github.com/itanium-cxx-abi/cxx-abi/issues/112.  Clang does
the same thing already, so after this patch Clang and GCC agree
about the mangling of __alignof__(type) and __alignof__(expr).

gcc/cp/ChangeLog:

	PR c++/88115
	* mangle.c (write_expression): Adjust the mangling of
	__alignof__.

include/ChangeLog:

	PR c++/88115
	* demangle.h (enum demangle_component_type): Add
	DEMANGLE_COMPONENT_VENDOR_EXPR.

libiberty/ChangeLog:

	PR c++/88115
	* cp-demangle.c (d_dump, d_make_comp, d_expression_1)
	(d_count_templates_scopes): Handle DEMANGLE_COMPONENT_VENDOR_EXPR.
	(d_print_comp_inner): Likewise.
	<case DEMANGLE_COMPONENT_EXTENDED_OPERATOR>: Revert r11-4926
	change.
	<case DEMANGLE_COMPONENT_UNARY>: Likewise.
	* testsuite/demangle-expected: Adjust __alignof__ tests.

gcc/testsuite/ChangeLog:

	PR c++/88115
	* g++.dg/cpp0x/alignof7.C: Adjust expected mangling.
This commit is contained in:
Patrick Palka 2021-03-30 22:57:11 -04:00
parent 0bbf0edbfc
commit a3bf6ce7f2
5 changed files with 37 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gcc/cp/mangle.c
View File

@ -3124,11 +3124,9 @@ write_expression (tree expr)
if (abi_version_at_least (15))
{
/* We used to mangle __alignof__ like alignof. */
write_string ("v111__alignof__");
if (TYPE_P (TREE_OPERAND (expr, 0)))
write_type (TREE_OPERAND (expr, 0));
else
write_expression (TREE_OPERAND (expr, 0));
write_string ("u11__alignof__");
write_template_arg (TREE_OPERAND (expr, 0));
write_char ('E');
return;
}
}

4
gcc/testsuite/g++.dg/cpp0x/alignof7.C
View File

@ -18,5 +18,5 @@ template void f4<int>(std::size_t);
// { dg-final { scan-assembler "_Z2f1IiEvDTatT_E" } }
// { dg-final { scan-assembler "_Z2f2IiEvDTaztlT_EE" } }
// { dg-final { scan-assembler "_Z2f3IiEvDTv111__alignof__T_E" } }
// { dg-final { scan-assembler "_Z2f4IiEvDTv111__alignof__tlT_EE" } }
// { dg-final { scan-assembler "_Z2f3IiEvDTu11__alignof__T_EE" } }
// { dg-final { scan-assembler "_Z2f4IiEvDTu11__alignof__XtlT_EEEE" } }

3
include/demangle.h
View File

@ -408,6 +408,9 @@ enum demangle_component_type
number which involves neither modifying the mangled string nor
allocating a new copy of the literal in memory. */
DEMANGLE_COMPONENT_LITERAL_NEG,
/* A vendor's builtin expression. The left subtree holds the
expression's name, and the right subtree is a argument list. */
DEMANGLE_COMPONENT_VENDOR_EXPR,
/* A libgcj compiled resource. The left subtree is the name of the
resource. */
DEMANGLE_COMPONENT_JAVA_RESOURCE,

47
libiberty/cp-demangle.c
View File

@ -815,6 +815,9 @@ d_dump (struct demangle_component *dc, int indent)
case DEMANGLE_COMPONENT_LITERAL_NEG:
printf ("negative literal\n");
break;
case DEMANGLE_COMPONENT_VENDOR_EXPR:
printf ("vendor expression\n");
break;
case DEMANGLE_COMPONENT_JAVA_RESOURCE:
printf ("java resource\n");
break;
@ -976,6 +979,7 @@ d_make_comp (struct d_info *di, enum demangle_component_type type,
case DEMANGLE_COMPONENT_TRINARY_ARG1:
case DEMANGLE_COMPONENT_LITERAL:
case DEMANGLE_COMPONENT_LITERAL_NEG:
case DEMANGLE_COMPONENT_VENDOR_EXPR:
case DEMANGLE_COMPONENT_COMPOUND_NAME:
case DEMANGLE_COMPONENT_VECTOR_TYPE:
case DEMANGLE_COMPONENT_CLONE:
@ -3344,6 +3348,7 @@ d_unresolved_name (struct d_info *di)
::= cl <expression>+ E
::= st <type>
::= <template-param>
::= u <source-name> <template-arg>* E # vendor extended expression
::= <unresolved-name>
::= <expr-primary>
@ -3425,6 +3430,15 @@ d_expression_1 (struct d_info *di)
return d_make_comp (di, DEMANGLE_COMPONENT_INITIALIZER_LIST,
type, d_exprlist (di, 'E'));
}
else if (peek == 'u')
{
/* A vendor extended expression. */
struct demangle_component *name, *args;
d_advance (di, 1);
name = d_source_name (di);
args = d_template_args_1 (di);
return d_make_comp (di, DEMANGLE_COMPONENT_VENDOR_EXPR, name, args);
}
else
{
struct demangle_component *op;
@ -4229,6 +4243,7 @@ d_count_templates_scopes (struct d_print_info *dpi,
case DEMANGLE_COMPONENT_TRINARY_ARG2:
case DEMANGLE_COMPONENT_LITERAL:
case DEMANGLE_COMPONENT_LITERAL_NEG:
case DEMANGLE_COMPONENT_VENDOR_EXPR:
case DEMANGLE_COMPONENT_JAVA_RESOURCE:
case DEMANGLE_COMPONENT_COMPOUND_NAME:
case DEMANGLE_COMPONENT_DECLTYPE:
@ -5509,18 +5524,9 @@ d_print_comp_inner (struct d_print_info *dpi, int options,
}
case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
{
struct demangle_component *name = dc->u.s_extended_operator.name;
if (name->type == DEMANGLE_COMPONENT_NAME
&& !strncmp (name->u.s_name.s, "__alignof__", name->u.s_name.len))
d_print_comp (dpi, options, dc->u.s_extended_operator.name);
else
{
d_append_string (dpi, "operator ");
d_print_comp (dpi, options, dc->u.s_extended_operator.name);
}
return;
}
d_append_string (dpi, "operator ");
d_print_comp (dpi, options, dc->u.s_extended_operator.name);
return;
case DEMANGLE_COMPONENT_CONVERSION:
d_append_string (dpi, "operator ");
@ -5585,14 +5591,8 @@ d_print_comp_inner (struct d_print_info *dpi, int options,
if (code && !strcmp (code, "gs"))
/* Avoid parens after '::'. */
d_print_comp (dpi, options, operand);
else if ((code && !strcmp (code, "st"))
|| (op->type == DEMANGLE_COMPONENT_EXTENDED_OPERATOR
&& (op->u.s_extended_operator.name->type
== DEMANGLE_COMPONENT_NAME)
&& !strncmp (op->u.s_extended_operator.name->u.s_name.s,
"__alignof__",
op->u.s_extended_operator.name->u.s_name.len)))
/* Always print parens for sizeof (type) and __alignof__. */
else if (code && !strcmp (code, "st"))
/* Always print parens for sizeof (type). */
{
d_append_char (dpi, '(');
d_print_comp (dpi, options, operand);
@ -5805,6 +5805,13 @@ d_print_comp_inner (struct d_print_info *dpi, int options,
}
return;
case DEMANGLE_COMPONENT_VENDOR_EXPR:
d_print_comp (dpi, options, d_left (dc));
d_append_char (dpi, '(');
d_print_comp (dpi, options, d_right (dc));
d_append_char (dpi, ')');
return;
case DEMANGLE_COMPONENT_NUMBER:
d_append_num (dpi, dc->u.s_number.number);
return;

4
libiberty/testsuite/demangle-expected
View File

@ -1471,10 +1471,10 @@ _Z2F2IZ1FvEUlvE_EN1AIT_E1XES2_
A<F()::{lambda()#1}>::X F2<F()::{lambda()#1}>(F()::{lambda()#1})
# PR 88115
_Z1fIiEvDTv111__alignof__T_E
_Z1fIiEvDTu11__alignof__T_EE
void f<int>(decltype (__alignof__(int)))
_Z1fIiEvDTv111__alignof__tlT_EE
_Z1fIiEvDTu11__alignof__XtlT_EEEE
void f<int>(decltype (__alignof__(int{})))
_Z1gI1AEv1SIXadsrT_oncviEE