You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
198 lines
6.1 KiB
198 lines
6.1 KiB
libcpp: Fix up #__VA_OPT__ handling [PR103415]
|
|
|
|
stringify_arg uses pfile->u_buff to create the string literal.
|
|
Unfortunately, paste_tokens -> _cpp_lex_direct -> lex_number -> _cpp_unaligned_alloc
|
|
can in some cases use pfile->u_buff too, which results in losing everything
|
|
prepared for the string literal until the token pasting.
|
|
|
|
The following patch fixes that by not calling paste_token during the
|
|
construction of the string literal, but doing that before. All the tokens
|
|
we are processing have been pushed into a token buffer using
|
|
tokens_buff_add_token so it is fine if we paste some of them in that buffer
|
|
(successful pasting creates a new token in that buffer), move following
|
|
tokens if any to make it contiguous, pop (throw away) the extra tokens at
|
|
the end and then do stringify_arg.
|
|
|
|
Also, paste_tokens now copies over PREV_WHITE and PREV_FALLTHROUGH flags
|
|
from the original lhs token to the replacement token. Copying that way
|
|
the PREV_WHITE flag is needed for the #__VA_OPT__ handling and copying
|
|
over PREV_FALLTHROUGH fixes the new Wimplicit-fallthrough-38.c test.
|
|
|
|
2021-12-01 Jakub Jelinek <jakub@redhat.com>
|
|
|
|
PR preprocessor/103415
|
|
libcpp/
|
|
* macro.c (stringify_arg): Remove va_opt argument and va_opt handling.
|
|
(paste_tokens): On successful paste or in PREV_WHITE and
|
|
PREV_FALLTHROUGH flags from the *plhs token to the new token.
|
|
(replace_args): Adjust stringify_arg callers. For #__VA_OPT__,
|
|
perform token pasting in a separate loop before stringify_arg call.
|
|
gcc/testsuite/
|
|
* c-c++-common/cpp/va-opt-8.c: New test.
|
|
* c-c++-common/Wimplicit-fallthrough-38.c: New test.
|
|
|
|
--- libcpp/macro.c.jj
|
|
+++ libcpp/macro.c
|
|
@@ -295,7 +295,7 @@ static cpp_context *next_context (cpp_re
|
|
static const cpp_token *padding_token (cpp_reader *, const cpp_token *);
|
|
static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int);
|
|
static const cpp_token *stringify_arg (cpp_reader *, const cpp_token **,
|
|
- unsigned int, bool);
|
|
+ unsigned int);
|
|
static void paste_all_tokens (cpp_reader *, const cpp_token *);
|
|
static bool paste_tokens (cpp_reader *, location_t,
|
|
const cpp_token **, const cpp_token *);
|
|
@@ -826,8 +826,7 @@ cpp_quote_string (uchar *dest, const uch
|
|
/* Convert a token sequence FIRST to FIRST+COUNT-1 to a single string token
|
|
according to the rules of the ISO C #-operator. */
|
|
static const cpp_token *
|
|
-stringify_arg (cpp_reader *pfile, const cpp_token **first, unsigned int count,
|
|
- bool va_opt)
|
|
+stringify_arg (cpp_reader *pfile, const cpp_token **first, unsigned int count)
|
|
{
|
|
unsigned char *dest;
|
|
unsigned int i, escape_it, backslash_count = 0;
|
|
@@ -844,24 +843,6 @@ stringify_arg (cpp_reader *pfile, const
|
|
{
|
|
const cpp_token *token = first[i];
|
|
|
|
- if (va_opt && (token->flags & PASTE_LEFT))
|
|
- {
|
|
- location_t virt_loc = pfile->invocation_location;
|
|
- const cpp_token *rhs;
|
|
- do
|
|
- {
|
|
- if (i == count)
|
|
- abort ();
|
|
- rhs = first[++i];
|
|
- if (!paste_tokens (pfile, virt_loc, &token, rhs))
|
|
- {
|
|
- --i;
|
|
- break;
|
|
- }
|
|
- }
|
|
- while (rhs->flags & PASTE_LEFT);
|
|
- }
|
|
-
|
|
if (token->type == CPP_PADDING)
|
|
{
|
|
if (source == NULL
|
|
@@ -995,6 +976,7 @@ paste_tokens (cpp_reader *pfile, locatio
|
|
return false;
|
|
}
|
|
|
|
+ lhs->flags |= (*plhs)->flags & (PREV_WHITE | PREV_FALLTHROUGH);
|
|
*plhs = lhs;
|
|
_cpp_pop_buffer (pfile);
|
|
return true;
|
|
@@ -1937,8 +1919,7 @@ replace_args (cpp_reader *pfile, cpp_has
|
|
if (src->flags & STRINGIFY_ARG)
|
|
{
|
|
if (!arg->stringified)
|
|
- arg->stringified = stringify_arg (pfile, arg->first, arg->count,
|
|
- false);
|
|
+ arg->stringified = stringify_arg (pfile, arg->first, arg->count);
|
|
}
|
|
else if ((src->flags & PASTE_LEFT)
|
|
|| (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)))
|
|
@@ -2065,11 +2046,46 @@ replace_args (cpp_reader *pfile, cpp_has
|
|
{
|
|
unsigned int count
|
|
= start ? paste_flag - start : tokens_buff_count (buff);
|
|
- const cpp_token *t
|
|
- = stringify_arg (pfile,
|
|
- start ? start + 1
|
|
- : (const cpp_token **) (buff->base),
|
|
- count, true);
|
|
+ const cpp_token **first
|
|
+ = start ? start + 1
|
|
+ : (const cpp_token **) (buff->base);
|
|
+ unsigned int i, j;
|
|
+
|
|
+ /* Paste any tokens that need to be pasted before calling
|
|
+ stringify_arg, because stringify_arg uses pfile->u_buff
|
|
+ which paste_tokens can use as well. */
|
|
+ for (i = 0, j = 0; i < count; i++, j++)
|
|
+ {
|
|
+ const cpp_token *token = first[i];
|
|
+
|
|
+ if (token->flags & PASTE_LEFT)
|
|
+ {
|
|
+ location_t virt_loc = pfile->invocation_location;
|
|
+ const cpp_token *rhs;
|
|
+ do
|
|
+ {
|
|
+ if (i == count)
|
|
+ abort ();
|
|
+ rhs = first[++i];
|
|
+ if (!paste_tokens (pfile, virt_loc, &token, rhs))
|
|
+ {
|
|
+ --i;
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+ while (rhs->flags & PASTE_LEFT);
|
|
+ }
|
|
+
|
|
+ first[j] = token;
|
|
+ }
|
|
+ if (j != i)
|
|
+ {
|
|
+ while (i-- != j)
|
|
+ tokens_buff_remove_last_token (buff);
|
|
+ count = j;
|
|
+ }
|
|
+
|
|
+ const cpp_token *t = stringify_arg (pfile, first, count);
|
|
while (count--)
|
|
tokens_buff_remove_last_token (buff);
|
|
if (src->flags & PASTE_LEFT)
|
|
--- gcc/testsuite/c-c++-common/cpp/va-opt-8.c.jj
|
|
+++ gcc/testsuite/c-c++-common/cpp/va-opt-8.c
|
|
@@ -0,0 +1,18 @@
|
|
+/* PR preprocessor/103415 */
|
|
+/* { dg-do run } */
|
|
+/* { dg-options "-std=gnu99" { target c } } */
|
|
+/* { dg-options "-std=c++20" { target c++ } } */
|
|
+
|
|
+#define n(x, ...) = #__VA_OPT__(x##3)
|
|
+#define o(x, ...) #__VA_OPT__(x##__VA_ARGS__##9)
|
|
+const char *c n(1 2, 4);
|
|
+const char *d = o(5 6, 7 8);
|
|
+
|
|
+int
|
|
+main ()
|
|
+{
|
|
+ if (__builtin_strcmp (c, "1 23")
|
|
+ || __builtin_strcmp (d, "5 67 89"))
|
|
+ __builtin_abort ();
|
|
+ return 0;
|
|
+}
|
|
--- gcc/testsuite/c-c++-common/Wimplicit-fallthrough-38.c.jj
|
|
+++ gcc/testsuite/c-c++-common/Wimplicit-fallthrough-38.c
|
|
@@ -0,0 +1,24 @@
|
|
+/* { dg-do compile } */
|
|
+/* { dg-options "-Wimplicit-fallthrough=3" } */
|
|
+
|
|
+#define FOO \
|
|
+int \
|
|
+foo (int a) \
|
|
+{ \
|
|
+ switch (a) \
|
|
+ { \
|
|
+ case 1: \
|
|
+ ++a; \
|
|
+ /* FALLTHRU */ \
|
|
+ case 2: \
|
|
+ ++a; \
|
|
+ /* FALLTHRU */ \
|
|
+ ca##se 3: \
|
|
+ ++a; \
|
|
+ default: \
|
|
+ break; \
|
|
+ } \
|
|
+ return a; \
|
|
+}
|
|
+
|
|
+FOO
|