On Sat, Dec 03, 2022 at 02:58:16PM -0500, Jason Merrill wrote:
> On 12/2/22 18:58, Marek Polacek wrote:
> > On Fri, Nov 18, 2022 at 08:39:10PM -0500, Jason Merrill wrote:
> > > On 11/18/22 18:52, Marek Polacek wrote:
> > > > +/* Parse a string literal or user defined string literal.
> > > > +
> > > > + user-defined-string-literal :
> > > > + string-literal ud-suffix
> > > > +
> > > > + Parameters as for cp_parser_string_literal. If LOOKUP_UDLIT,
> > > > perform
> > > > + a lookup for a suitable template function. */
> > > > +
> > > > +static inline cp_expr
> > > > +cp_parser_userdef_string_literal (cp_parser *parser, bool translate,
> > > > + bool wide_ok, bool lookup_udlit =
> > > > true)
> > >
> > > I think this function doesn't need the translate and wide_ok parms, they
> > > can
> > > always be true.
> >
> > I've dropped the wide_ok one, but not the other, because...
> > > > +{
> > > > + return cp_parser_string_literal_common (parser, translate, wide_ok,
> > > > + /*udl_ok=*/true,
> > > > lookup_udlit);
> > > > +}
> > > > +
> > > > /* Look up a literal operator with the name and the exact arguments.
> > > > */
> > > > static tree
> > > > @@ -4913,7 +4955,7 @@ cp_parser_userdef_numeric_literal (cp_parser
> > > > *parser)
> > > > as arguments. */
> > > > static tree
> > > > -cp_parser_userdef_string_literal (tree literal)
> > > > +finish_userdef_string_literal (tree literal)
> > > > {
> > > > tree suffix_id = USERDEF_LITERAL_SUFFIX_ID (literal);
> > > > tree name = cp_literal_operator_id (IDENTIFIER_POINTER
> > > > (suffix_id));
> > > > @@ -5652,10 +5694,10 @@ cp_parser_primary_expression (cp_parser *parser,
> > > > case CPP_UTF8STRING_USERDEF:
> > > > /* ??? Should wide strings be allowed when
> > > > parser->translate_strings_p
> > > > is false (i.e. in attributes)? If not, we can kill the third
> > > > - argument to cp_parser_string_literal. */
> > >
> > > I think the answer to this old question is no: if we have an
> > > encoding-prefix, we should be translating.
> >
> > ...I don't actually know how to resolve this. wide_ok is always true here.
> > Should that change? Or rather, should translate be false for CPP_STRING
> > only?
Sorry it's taken so long to get back to this.
> The one current exception to my assertion above is static_assert, for which
> we currently allow encoding-prefixes but don't translate. I think this is
> wrong, that we should translate the string. But I'm not confident of that.
>
> But to your question, yes: when translate is false, I think we also don't
> want to allow UDLs. So _userdef can always pass true for translate. And as
> below we should call it only when translate would be true.
Done: _userdef no longer has the translate paramater and it's only called
when parser->translate_strings_p.
> Incidentally, it seems that we set translate off for all attributes, even
> ones that would take a normal expression argument where presumably we do
> want translation (and UDLs). The whole business of different parsing for
> different attributes is a headache. You don't need to deal with this now.
>
> > > > - return (cp_parser_string_literal (parser,
> > > > - parser->translate_strings_p,
> > > > - true)
> > > > + argument to cp_parser_{,userdef}string_literal. */
> > > > + return (cp_parser_userdef_string_literal (parser,
> > > > +
> > > > parser->translate_strings_p,
> > > > + /*wide_ok=*/true)
> > >
> > > For CPP_*STRING* without _USERDEF, we should still call
> > > cp_parser_string_literal.
> >
> > It looks like we always have to call cp_parser_userdef_string_literal
> > otherwise this would be reejcted:
> >
> > std::string concat01 = "Hello, " "World!"_www;
> >
> > Because first we see a CPP_STRING but the subsequent UDL shouldn't
> > be rejected.
>
> Ah, I didn't notice the function was handling a sequence of string-literals.
> So maybe we want to call _userdef here when translate_strings_p, and not
> when it's false.
Resolved by the change above. Thanks,
Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
-- >8 --
In this PR, we are crashing because we've encountered a UDL where a
string-literal is expected. This patch makes the parser reject string
and character UDLs in all places where the grammar requires a
string-literal and not a user-defined-string-literal.
I've introduced two new wrappers; the existing cp_parser_string_literal
was renamed to cp_parser_string_literal_common and should not be called
directly. finish_userdef_string_literal is renamed from
cp_parser_userdef_string_literal.
PR c++/105300
gcc/c-family/ChangeLog:
* c-pragma.cc (handle_pragma_message): Warn for CPP_STRING_USERDEF.
gcc/cp/ChangeLog:
* parser.cc: Remove unnecessary forward declarations.
(cp_parser_string_literal): New wrapper.
(cp_parser_string_literal_common): Renamed from
cp_parser_string_literal. Add a bool parameter. Give an error when
UDLs are not permitted.
(cp_parser_userdef_string_literal): New wrapper.
(finish_userdef_string_literal): Renamed from
cp_parser_userdef_string_literal.
(cp_parser_primary_expression): Call cp_parser_userdef_string_literal
instead of cp_parser_string_literal.
(cp_parser_linkage_specification): Move a variable declaration closer
to its first use.
(cp_parser_static_assert): Likewise.
(cp_parser_operator): Call cp_parser_userdef_string_literal instead of
cp_parser_string_literal.
(cp_parser_asm_definition): Move a variable declaration closer to its
first use.
(cp_parser_asm_specification_opt): Move variable declarations closer to
their first use.
(cp_parser_asm_operand_list): Likewise.
(cp_parser_asm_clobber_list): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/cpp0x/udlit-error1.C: New test.
---
gcc/c-family/c-pragma.cc | 3 +
gcc/cp/parser.cc | 133 +++++++++++++++-------
gcc/testsuite/g++.dg/cpp0x/udlit-error1.C | 21 ++++
3 files changed, 113 insertions(+), 44 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/cpp0x/udlit-error1.C
diff --git a/gcc/c-family/c-pragma.cc b/gcc/c-family/c-pragma.cc
index 91fabf0a513..bba9172e8a1 100644
--- a/gcc/c-family/c-pragma.cc
+++ b/gcc/c-family/c-pragma.cc
@@ -1390,6 +1390,9 @@ handle_pragma_message (cpp_reader *)
}
else if (token == CPP_STRING)
message = x;
+ else if (token == CPP_STRING_USERDEF)
+ GCC_BAD ("string literal with user-defined suffix is invalid in this "
+ "context");
else
GCC_BAD ("expected a string after %<#pragma message%>");
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 8b1658decba..4b366d6c64f 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -2227,16 +2227,8 @@ pop_unparsed_function_queues (cp_parser *parser)
/* Lexical conventions [gram.lex] */
-static cp_expr cp_parser_identifier
- (cp_parser *);
-static cp_expr cp_parser_string_literal
- (cp_parser *, bool, bool, bool);
-static cp_expr cp_parser_userdef_char_literal
- (cp_parser *);
-static tree cp_parser_userdef_string_literal
+static tree finish_userdef_string_literal
(tree);
-static cp_expr cp_parser_userdef_numeric_literal
- (cp_parser *);
/* Basic concepts [gram.basic] */
@@ -4408,11 +4400,15 @@ cp_parser_identifier (cp_parser* parser)
return error_mark_node;
}
-/* Parse a sequence of adjacent string constants. Returns a
+/* Worker for cp_parser_string_literal and cp_parser_userdef_string_literal.
+ Do not call this directly; use either of the above.
+
+ Parse a sequence of adjacent string constants. Return a
TREE_STRING representing the combined, nul-terminated string
constant. If TRANSLATE is true, translate the string to the
execution character set. If WIDE_OK is true, a wide string is
- invalid here.
+ valid here. If UDL_OK is true, a string literal with user-defined
+ suffix can be used in this context.
C++98 [lex.string] says that if a narrow string literal token is
adjacent to a wide string literal token, the behavior is undefined.
@@ -4422,9 +4418,11 @@ cp_parser_identifier (cp_parser* parser)
This code is largely lifted from lex_string() in c-lex.cc.
FUTURE: ObjC++ will need to handle @-strings here. */
+
static cp_expr
-cp_parser_string_literal (cp_parser *parser, bool translate, bool wide_ok,
- bool lookup_udlit = true)
+cp_parser_string_literal_common (cp_parser *parser, bool translate,
+ bool wide_ok, bool udl_ok,
+ bool lookup_udlit)
{
tree value;
size_t count;
@@ -4449,6 +4447,12 @@ cp_parser_string_literal (cp_parser *parser, bool
translate, bool wide_ok,
if (cpp_userdef_string_p (tok->type))
{
+ if (!udl_ok)
+ {
+ error_at (loc, "string literal with user-defined suffix "
+ "is invalid in this context");
+ return error_mark_node;
+ }
string_tree = USERDEF_LITERAL_VALUE (tok->u.value);
curr_type = cpp_userdef_string_remove_type (tok->type);
curr_tok_is_userdef_p = true;
@@ -4539,6 +4543,12 @@ cp_parser_string_literal (cp_parser *parser, bool
translate, bool wide_ok,
tok = cp_lexer_peek_token (parser->lexer);
if (cpp_userdef_string_p (tok->type))
{
+ if (!udl_ok)
+ {
+ error_at (loc, "string literal with user-defined suffix "
+ "is invalid in this context");
+ return error_mark_node;
+ }
string_tree = USERDEF_LITERAL_VALUE (tok->u.value);
curr_type = cpp_userdef_string_remove_type (tok->type);
curr_tok_is_userdef_p = true;
@@ -4608,7 +4618,7 @@ cp_parser_string_literal (cp_parser *parser, bool
translate, bool wide_ok,
tree literal = build_userdef_literal (suffix_id, value,
OT_NONE, NULL_TREE);
if (lookup_udlit)
- value = cp_parser_userdef_string_literal (literal);
+ value = finish_userdef_string_literal (literal);
else
value = literal;
}
@@ -4626,6 +4636,37 @@ cp_parser_string_literal (cp_parser *parser, bool
translate, bool wide_ok,
return cp_expr (value, loc);
}
+/* Parse a sequence of adjacent string constants. Return a TREE_STRING
+ representing the combined, nul-terminated string constant. If
+ TRANSLATE is true, translate the string to the execution character set.
+ If WIDE_OK is true, a wide string is valid here.
+
+ This function issues an error if a user defined string literal is
+ encountered; use cp_parser_userdef_string_literal if UDLs are allowed. */
+
+static inline cp_expr
+cp_parser_string_literal (cp_parser *parser, bool translate, bool wide_ok)
+{
+ return cp_parser_string_literal_common (parser, translate, wide_ok,
+ /*udl_ok=*/false,
+ /*lookup_udlit=*/false);
+}
+
+/* Parse a string literal or user defined string literal.
+
+ user-defined-string-literal :
+ string-literal ud-suffix
+
+ If LOOKUP_UDLIT, perform a lookup for a suitable template function. */
+
+static inline cp_expr
+cp_parser_userdef_string_literal (cp_parser *parser, bool lookup_udlit)
+{
+ return cp_parser_string_literal_common (parser, /*translate=*/true,
+ /*wide_ok=*/true, /*udl_ok=*/true,
+ lookup_udlit);
+}
+
/* Look up a literal operator with the name and the exact arguments. */
static tree
@@ -4923,7 +4964,7 @@ cp_parser_userdef_numeric_literal (cp_parser *parser)
as arguments. */
static tree
-cp_parser_userdef_string_literal (tree literal)
+finish_userdef_string_literal (tree literal)
{
tree suffix_id = USERDEF_LITERAL_SUFFIX_ID (literal);
tree name = cp_literal_operator_id (IDENTIFIER_POINTER (suffix_id));
@@ -5663,10 +5704,15 @@ cp_parser_primary_expression (cp_parser *parser,
/* ??? Should wide strings be allowed when parser->translate_strings_p
is false (i.e. in attributes)? If not, we can kill the third
argument to cp_parser_string_literal. */
- return (cp_parser_string_literal (parser,
- parser->translate_strings_p,
- true)
- .maybe_add_location_wrapper ());
+ if (parser->translate_strings_p)
+ return (cp_parser_userdef_string_literal (parser,
+ /*lookup_udlit=*/true)
+ .maybe_add_location_wrapper ());
+ else
+ return (cp_parser_string_literal (parser,
+ /*translate=*/false,
+ /*wide_ok=*/true)
+ .maybe_add_location_wrapper ());
case CPP_OPEN_PAREN:
/* If we see `( { ' then we are looking at the beginning of
@@ -16222,15 +16268,14 @@ cp_parser_function_specifier_opt (cp_parser* parser,
static void
cp_parser_linkage_specification (cp_parser* parser, tree prefix_attr)
{
- tree linkage;
-
/* Look for the `extern' keyword. */
cp_token *extern_token
= cp_parser_require_keyword (parser, RID_EXTERN, RT_EXTERN);
/* Look for the string-literal. */
cp_token *string_token = cp_lexer_peek_token (parser->lexer);
- linkage = cp_parser_string_literal (parser, false, false);
+ tree linkage = cp_parser_string_literal (parser, /*translate=*/false,
+ /*wide_ok=*/false);
/* Transform the literal into an identifier. If the literal is a
wide-character string, or contains embedded NULs, then we can't
@@ -16360,9 +16405,8 @@ cp_parser_static_assert(cp_parser *parser, bool
member_p)
cp_parser_require (parser, CPP_COMMA, RT_COMMA);
/* Parse the string-literal message. */
- message = cp_parser_string_literal (parser,
- /*translate=*/false,
- /*wide_ok=*/true);
+ message = cp_parser_string_literal (parser, /*translate=*/false,
+ /*wide_ok=*/true);
/* A `)' completes the static assertion. */
if (!parens.require_close (parser))
@@ -17410,7 +17454,6 @@ cp_parser_operator (cp_parser* parser, location_t
start_loc)
case CPP_STRING16_USERDEF:
case CPP_STRING32_USERDEF:
{
- cp_expr str;
tree string_tree;
int sz, len;
@@ -17418,8 +17461,8 @@ cp_parser_operator (cp_parser* parser, location_t
start_loc)
maybe_warn_cpp0x (CPP0X_USER_DEFINED_LITERALS);
/* Consume the string. */
- str = cp_parser_string_literal (parser, /*translate=*/true,
- /*wide_ok=*/true, /*lookup_udlit=*/false);
+ cp_expr str = cp_parser_userdef_string_literal (parser,
+ /*lookup_udlit=*/false);
if (str == error_mark_node)
return error_mark_node;
else if (TREE_CODE (str) == USERDEF_LITERAL)
@@ -22072,7 +22115,6 @@ cp_parser_using_directive (cp_parser* parser)
static void
cp_parser_asm_definition (cp_parser* parser)
{
- tree string;
tree outputs = NULL_TREE;
tree inputs = NULL_TREE;
tree clobbers = NULL_TREE;
@@ -22180,7 +22222,8 @@ cp_parser_asm_definition (cp_parser* parser)
if (!cp_parser_require (parser, CPP_OPEN_PAREN, RT_OPEN_PAREN))
return;
/* Look for the string. */
- string = cp_parser_string_literal (parser, false, false);
+ tree string = cp_parser_string_literal (parser, /*translate=*/false,
+ /*wide_ok=*/false);
if (string == error_mark_node)
{
cp_parser_skip_to_closing_parenthesis (parser, true, false,
@@ -28655,11 +28698,8 @@ cp_parser_yield_expression (cp_parser* parser)
static tree
cp_parser_asm_specification_opt (cp_parser* parser)
{
- cp_token *token;
- tree asm_specification;
-
/* Peek at the next token. */
- token = cp_lexer_peek_token (parser->lexer);
+ cp_token *token = cp_lexer_peek_token (parser->lexer);
/* If the next token isn't the `asm' keyword, then there's no
asm-specification. */
if (!cp_parser_is_keyword (token, RID_ASM))
@@ -28672,7 +28712,9 @@ cp_parser_asm_specification_opt (cp_parser* parser)
parens.require_open (parser);
/* Look for the string-literal. */
- asm_specification = cp_parser_string_literal (parser, false, false);
+ tree asm_specification = cp_parser_string_literal (parser,
+ /*translate=*/false,
+ /*wide_ok=*/false);
/* Look for the `)'. */
parens.require_close (parser);
@@ -28705,8 +28747,6 @@ cp_parser_asm_operand_list (cp_parser* parser)
while (true)
{
- tree string_literal;
- tree expression;
tree name;
if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE))
@@ -28724,13 +28764,15 @@ cp_parser_asm_operand_list (cp_parser* parser)
else
name = NULL_TREE;
/* Look for the string-literal. */
- string_literal = cp_parser_string_literal (parser, false, false);
+ tree string_literal = cp_parser_string_literal (parser,
+ /*translate=*/false,
+ /*wide_ok=*/false);
/* Look for the `('. */
matching_parens parens;
parens.require_open (parser);
/* Parse the expression. */
- expression = cp_parser_expression (parser);
+ tree expression = cp_parser_expression (parser);
/* Look for the `)'. */
parens.require_close (parser);
@@ -28770,10 +28812,10 @@ cp_parser_asm_clobber_list (cp_parser* parser)
while (true)
{
- tree string_literal;
-
/* Look for the string literal. */
- string_literal = cp_parser_string_literal (parser, false, false);
+ tree string_literal = cp_parser_string_literal (parser,
+ /*translate=*/false,
+ /*wide_ok=*/false);
/* Add it to the list. */
clobbers = tree_cons (NULL_TREE, string_literal, clobbers);
/* If the next token is not a `,', then the list is
@@ -46345,7 +46387,9 @@ cp_parser_omp_context_selector (cp_parser *parser, tree
set, bool has_parms_p)
cp_lexer_consume_token (parser->lexer);
}
else if (cp_lexer_next_token_is (parser->lexer, CPP_STRING))
- value = cp_parser_string_literal (parser, false, false);
+ value = cp_parser_string_literal (parser,
+ /*translate=*/false,
+ /*wide_ok=*/false);
else
{
cp_parser_error (parser, "expected identifier or "
@@ -49367,7 +49411,8 @@ pragma_lex (tree *value, location_t *loc)
if (ret == CPP_PRAGMA_EOL)
ret = CPP_EOF;
else if (ret == CPP_STRING)
- *value = cp_parser_string_literal (the_parser, false, false);
+ *value = cp_parser_string_literal (the_parser, /*translate=*/false,
+ /*wide_ok=*/false);
else
{
if (ret == CPP_KEYWORD)
diff --git a/gcc/testsuite/g++.dg/cpp0x/udlit-error1.C
b/gcc/testsuite/g++.dg/cpp0x/udlit-error1.C
new file mode 100644
index 00000000000..66e300e350f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/udlit-error1.C
@@ -0,0 +1,21 @@
+// PR c++/105300
+// { dg-do compile { target c++11 } }
+
+void operator""_x(const char *, decltype(sizeof(0)));
+
+#include ""_x // { dg-error "include expects" }
+#line ""_x // { dg-error "not a positive integer" }
+#if __has_include(""_x) // { dg-error "requires a header-name" }
+#endif
+
+#pragma message "hi"_x // { dg-warning "string literal with user-defined
suffix is invalid in this context" }
+
+extern "C"_x { void g(); } // { dg-error "before user-defined string literal" }
+static_assert(true, "foo"_x); // { dg-error "string literal with user-defined
suffix is invalid in this context|expected" }
+
+[[deprecated("oof"_x)]]
+void
+lol () // { dg-error "not a string" }
+{
+ asm (""_x); // { dg-error "string literal with user-defined suffix is
invalid in this context" }
+}
base-commit: 6071e495e5802a8949d2b02df6aa31a5f40f2af9
--
2.39.0
