On Fri, Sep 30, 2016 at 11:26:27AM +0200, Marek Polacek wrote:
> I haven't gone over the patch in detail yet, but I wonder if we should
> also accept /* Else, fall through. */ (to be found e.g. in aarch64-simd.md).
Here is the patch split into a series of 3 patches (the later patches depend
on the earlier ones):
1) the first patch fixes some bugs and fixes also -Wimplicit-fallthrough -C
2) the second patch adds the else and intentional/ly etc.
3) the third one adds the optional comma between else and fall
Bootstrapped/regtested on x86_64-linux and i686-linux, ok?
Jakub
2016-09-30 Jakub Jelinek <[email protected]>
* c-lex.c (c_lex_with_flags) <case CPP_COMMENT>: For CPP_COMMENT
token with PREV_FALLTHROUGH, skip all following CPP_PADDING and
CPP_COMMENT tokens and set add_flags to PREV_FALLTHROUGH afterwards.
* doc/invoke.texi (-Wimplicit-fallthrough): Document the accepted
FALLTHRU comment styles.
* lex.c (fallthrough_comment_p): Fix off-by-one size comparison
errors, cleanup.
(_cpp_lex_direct): Allow arbitrary comments in between
fallthrough_comment_p comment and following token.
* c-c++-common/Wimplicit-fallthrough-22.c: New test.
* c-c++-common/Wimplicit-fallthrough-23.c: New test.
--- gcc/c-family/c-lex.c.jj 2016-09-30 18:16:26.303336781 +0200
+++ gcc/c-family/c-lex.c 2016-09-30 18:26:14.650999215 +0200
@@ -598,7 +598,18 @@ c_lex_with_flags (tree *value, location_
/* CPP_COMMENT will appear when compiling with -C and should be
ignored. */
- case CPP_COMMENT:
+ case CPP_COMMENT:
+ if (tok->flags & PREV_FALLTHROUGH)
+ {
+ do
+ {
+ tok = cpp_get_token_with_location (parse_in, loc);
+ type = tok->type;
+ }
+ while (type == CPP_PADDING || type == CPP_COMMENT);
+ add_flags = PREV_FALLTHROUGH;
+ goto retry_after_at;
+ }
goto retry;
default:
--- gcc/doc/invoke.texi.jj 2016-09-30 18:16:26.308336719 +0200
+++ gcc/doc/invoke.texi 2016-09-30 18:26:33.288766793 +0200
@@ -4157,10 +4157,26 @@ C++17 provides a standard way to suppres
warning using @code{[[fallthrough]];} instead of the GNU attribute. In C++11
or C++14 users can use @code{[[gnu::fallthrough]];}, which is a GNU extension.
Instead of the these attributes, it is also possible to add a "falls through"
-comment to silence the warning. GCC accepts a wide range of such comments,
-for example all of "Falls through.", "fallthru", "FALLS-THROUGH" work. This
-comment needs to consist of two words merely, optionally followed by periods
-or whitespaces.
+comment to silence the warning. The whole body of the C or C++ style comment
+should match one of the following regular expressions:
+
+@itemize @bullet
+
+@item @code{-fallthrough}
+
+@item @code{@@fallthrough@@}
+
+@item @code{[ \t]*FALL(S | |-)?THR(OUGH|U)\.?[ \t]*}
+
+@item @code{[ \t]*Fall((s | |-)[Tt]|t)hr(ough|u)\.?[ \t]*}
+
+@item @code{[ \t]*fall(s | |-)?thr(ough|u)\.?[ \t]*}
+
+@end itemize
+
+and the comment needs to be followed after optional whitespace and other
comments
+by @code{case} or @code{default} keywords or by a user label that preceeds some
+@code{case} or @code{default} label.
@smallexample
@group
--- libcpp/lex.c.jj 2016-09-30 18:16:22.987378137 +0200
+++ libcpp/lex.c 2016-09-30 18:26:33.289766781 +0200
@@ -2060,7 +2060,7 @@ fallthrough_comment_p (cpp_reader *pfile
}
/* Whole comment contents (regex):
[ \t]*FALL(S | |-)?THR(OUGH|U)\.?[ \t]*
- [ \t]*Fall(s | |-)?[Tt]hr(ough|u)\.?[ \t]*
+ [ \t]*Fall((s | |-)[Tt]|t)hr(ough|u)\.?[ \t]*
[ \t]*fall(s | |-)?thr(ough|u)\.?[ \t]*
*/
else
@@ -2070,30 +2070,27 @@ fallthrough_comment_p (cpp_reader *pfile
unsigned char f = *from;
if (f != 'F' && f != 'f')
return false;
- if ((size_t) (pfile->buffer->cur - from) < sizeof "fallthrough")
+ if ((size_t) (pfile->buffer->cur - from) < sizeof "fallthru" - 1)
return false;
bool all_upper = false;
if (f == 'F' && memcmp (from + 1, "ALL", sizeof "ALL" - 1) == 0)
all_upper = true;
else if (memcmp (from + 1, "all", sizeof "all" - 1))
return false;
- if (from[sizeof "fall" - 1] == (all_upper ? 'S' : 's')
- && from[sizeof "falls" - 1] == ' ')
- from += sizeof "falls " - 1;
- else if (from[sizeof "fall" - 1] == ' '
- || from[sizeof "fall" - 1] == '-')
- from += sizeof "fall " - 1;
- else if (from[sizeof "fall" - 1] != (all_upper ? 'T' : 't'))
+ from += sizeof "fall" - 1;
+ if (*from == (all_upper ? 'S' : 's') && from[1] == ' ')
+ from += 2;
+ else if (*from == ' ' || *from == '-')
+ from++;
+ else if (*from != (all_upper ? 'T' : 't'))
return false;
- else
- from += sizeof "fall" - 1;
if ((f == 'f' || *from != 'T') && (all_upper || *from != 't'))
return false;
- if ((size_t) (pfile->buffer->cur - from) < sizeof "thru")
+ if ((size_t) (pfile->buffer->cur - from) < sizeof "thru" - 1)
return false;
if (memcmp (from + 1, all_upper ? "HRU" : "hru", sizeof "hru" - 1))
{
- if ((size_t) (pfile->buffer->cur - from) < sizeof "through")
+ if ((size_t) (pfile->buffer->cur - from) < sizeof "through" - 1)
return false;
if (memcmp (from + 1, all_upper ? "HROUGH" : "hrough",
sizeof "hrough" - 1))
@@ -2398,7 +2395,8 @@ _cpp_lex_direct (cpp_reader *pfile)
{
cppchar_t c;
cpp_buffer *buffer;
- const unsigned char *comment_start = NULL;
+ const unsigned char *comment_start;
+ bool fallthrough_comment = false;
cpp_token *result = pfile->cur_token++;
fresh_line:
@@ -2426,7 +2424,7 @@ _cpp_lex_direct (cpp_reader *pfile)
return result;
}
if (buffer != pfile->buffer)
- comment_start = NULL;
+ fallthrough_comment = false;
if (!pfile->keep_tokens)
{
pfile->cur_run = &pfile->base_run;
@@ -2535,8 +2533,7 @@ _cpp_lex_direct (cpp_reader *pfile)
}
/* Signal FALLTHROUGH comment followed by another token. */
- if (comment_start
- && fallthrough_comment_p (pfile, comment_start))
+ if (fallthrough_comment)
result->flags |= PREV_FALLTHROUGH;
break;
@@ -2623,13 +2620,16 @@ _cpp_lex_direct (cpp_reader *pfile)
break;
}
+ if (fallthrough_comment_p (pfile, comment_start))
+ fallthrough_comment = true;
+
if (!pfile->state.save_comments)
{
result->flags |= PREV_WHITE;
goto update_tokens_line;
}
- if (fallthrough_comment_p (pfile, comment_start))
+ if (fallthrough_comment)
result->flags |= PREV_FALLTHROUGH;
/* Save the comment as a token in its own right. */
--- gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c.jj 2016-09-30
18:16:26.293336906 +0200
+++ gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c 2016-09-30
18:26:33.289766781 +0200
@@ -0,0 +1,123 @@
+/* { dg-do compile } */
+/* { dg-options "-Wimplicit-fallthrough" } */
+
+void bar (int);
+
+void
+foo (int i)
+{
+ switch (i)
+ {
+ case 1:
+ bar (1); /* { dg-bogus "this statement may \[laf]*
through" } */
+ /* FALLTHROUGH */
+ case 2:
+ bar (2);
+ break;
+ case 3:
+ bar (3); /* { dg-bogus "this statement may \[laf]*
through" } */
+ /* FALLS THRU. */
+ /* Some other comment. */
+ case 4:
+ bar (4);
+ break;
+ case 7:
+ bar (7); /* { dg-bogus "this statement may \[laf]*
through" } */
+ /* Some comment. */
+ /* fallthrough. */
+ /* Some other comment. */
+ /* And yet another. */
+ case 8:
+ bar (8);
+ break;
+ case 15:
+ bar (15); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*-fallthrough*/
+ case 16:
+ bar (16);
+ break;
+ case 17:
+ bar (17); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*@fallthrough@*/
+ case 18:
+ bar (18);
+ break;
+ case 23:
+ bar (23); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*fallthru*/
+ case 24:
+ bar (24);
+ break;
+ case 31:
+ bar (31); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*Falls thru*/
+ case 32:
+ bar (32);
+ break;
+ case 33:
+ bar (33); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*Fall-through*/
+ case 34:
+ bar (34);
+ break;
+ default:
+ break;
+ }
+ switch (i)
+ {
+ case 1:
+ bar (1); /* { dg-bogus "this statement may \[laf]*
through" } */
+ // FALLTHROUGH
+ case 2:
+ bar (2);
+ break;
+ case 3:
+ bar (3); /* { dg-bogus "this statement may \[laf]*
through" } */
+ // FALLS THRU.
+ // Some other comment.
+ case 4:
+ bar (4);
+ break;
+ case 7:
+ bar (7); /* { dg-bogus "this statement may \[laf]*
through" } */
+ // Some comment.
+ // fallthrough
+ // Some other comment.
+ // And yet another.
+ case 8:
+ bar (8);
+ break;
+ case 15:
+ bar (15); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //-fallthrough
+ case 16:
+ bar (16);
+ break;
+ case 17:
+ bar (17); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //@fallthrough@
+ case 18:
+ bar (18);
+ break;
+ case 23:
+ bar (23); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //fallthru
+ case 24:
+ bar (24);
+ break;
+ case 31:
+ bar (31); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //Falls thru
+ case 32:
+ bar (32);
+ break;
+ case 33:
+ bar (33); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //Fall-through
+ case 34:
+ bar (34);
+ break;
+ default:
+ break;
+ }
+}
--- gcc/testsuite/c-c++-common/Wimplicit-fallthrough-23.c.jj 2016-09-30
18:16:26.298336844 +0200
+++ gcc/testsuite/c-c++-common/Wimplicit-fallthrough-23.c 2016-09-30
18:26:14.659999103 +0200
@@ -0,0 +1,4 @@
+/* { dg-do compile } */
+/* { dg-options "-Wimplicit-fallthrough -C" } */
+
+#include "Wimplicit-fallthrough-22.c"
2016-09-30 Jakub Jelinek <[email protected]>
* doc/invoke.texi (-Wimplicit-fallthrough): Document FALLTHRU comment
style changes.
* lex.c (fallthrough_comment_p): Extend to handle more common FALLTHRU
comment styles.
* c-c++-common/Wimplicit-fallthrough-22.c (foo): Add further tests.
--- gcc/doc/invoke.texi.jj 2016-09-30 17:21:11.743575991 +0200
+++ gcc/doc/invoke.texi 2016-09-30 17:39:41.838766235 +0200
@@ -4166,11 +4166,13 @@ should match one of the following regula
@item @code{@@fallthrough@@}
-@item @code{[ \t]*FALL(S | |-)?THR(OUGH|U)\.?[ \t]*}
+@item @code{lint -fallthrough ?}
-@item @code{[ \t]*Fall((s | |-)[Tt]|t)hr(ough|u)\.?[ \t]*}
+@item @code{[ \t.!]*(ELSE |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?}
-@item @code{[ \t]*fall(s | |-)?thr(ough|u)\.?[ \t]*}
+@item @code{[ \t.!]*(Else |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[
\t.!]*(-[^\n\r]*)?}
+
+@item @code{[ \t.!]*([Ee]lse |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[
\t.!]*(-[^\n\r]*)?}
@end itemize
--- libcpp/lex.c.jj 2016-09-30 17:20:46.959884436 +0200
+++ libcpp/lex.c 2016-09-30 17:39:38.854803331 +0200
@@ -2059,22 +2059,86 @@ fallthrough_comment_p (cpp_reader *pfile
from += 1 + len;
}
/* Whole comment contents (regex):
- [ \t]*FALL(S | |-)?THR(OUGH|U)\.?[ \t]*
- [ \t]*Fall((s | |-)[Tt]|t)hr(ough|u)\.?[ \t]*
- [ \t]*fall(s | |-)?thr(ough|u)\.?[ \t]*
+ lint -fallthrough ?
+ */
+ else if (*from == 'l')
+ {
+ size_t len = sizeof "int -fallthrough" - 1;
+ if ((size_t) (pfile->buffer->cur - from - 1) < len)
+ return false;
+ if (memcmp (from + 1, "int -fallthrough", len))
+ return false;
+ from += 1 + len;
+ if (*from == ' ')
+ from++;
+ }
+ /* Whole comment contents (regex):
+ [ \t.!]*(ELSE |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?
+ [ \t.!]*(Else |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[
\t.!]*(-[^\n\r]*)?
+ [ \t.!]*([Ee]lse |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[
\t.!]*(-[^\n\r]*)?
*/
else
{
- while (*from == ' ' || *from == '\t')
+ while (*from == ' ' || *from == '\t' || *from == '.' || *from == '!')
from++;
unsigned char f = *from;
+ bool all_upper = false;
+ if (f == 'E' || f == 'e')
+ {
+ if ((size_t) (pfile->buffer->cur - from)
+ < sizeof "else fallthru" - 1)
+ return false;
+ if (f == 'E' && memcmp (from + 1, "LSE F", sizeof "LSE F" - 1) == 0)
+ all_upper = true;
+ else if (memcmp (from + 1, "lse ", sizeof "lse " - 1))
+ return false;
+ from += sizeof "else " - 1;
+ if (f == 'e' && *from == 'F')
+ return false;
+ f = *from;
+ }
+ else if (f == 'I' || f == 'i')
+ {
+ if ((size_t) (pfile->buffer->cur - from)
+ < sizeof "intentional fallthru" - 1)
+ return false;
+ if (f == 'I' && memcmp (from + 1, "NTENTIONAL",
+ sizeof "NTENTIONAL" - 1) == 0)
+ all_upper = true;
+ else if (memcmp (from + 1, "ntentional",
+ sizeof "ntentional" - 1))
+ return false;
+ from += sizeof "intentional" - 1;
+ if (*from == ' ')
+ {
+ from++;
+ if (all_upper && *from == 'f')
+ return false;
+ }
+ else if (all_upper)
+ {
+ if (memcmp (from, "LY F", sizeof "LY F" - 1))
+ return false;
+ from += sizeof "LY " - 1;
+ }
+ else
+ {
+ if (memcmp (from, "ly ", sizeof "ly " - 1))
+ return false;
+ from += sizeof "ly " - 1;
+ }
+ if (f == 'i' && *from == 'F')
+ return false;
+ f = *from;
+ }
if (f != 'F' && f != 'f')
return false;
if ((size_t) (pfile->buffer->cur - from) < sizeof "fallthru" - 1)
return false;
- bool all_upper = false;
if (f == 'F' && memcmp (from + 1, "ALL", sizeof "ALL" - 1) == 0)
all_upper = true;
+ else if (all_upper)
+ return false;
else if (memcmp (from + 1, "all", sizeof "all" - 1))
return false;
from += sizeof "fall" - 1;
@@ -2099,10 +2163,28 @@ fallthrough_comment_p (cpp_reader *pfile
}
else
from += sizeof "thru" - 1;
- if (*from == '.')
- from++;
- while (*from == ' ' || *from == '\t')
+ while (*from == ' ' || *from == '\t' || *from == '.' || *from == '!')
from++;
+ if (*from == '-')
+ {
+ from++;
+ if (*comment_start == '*')
+ {
+ do
+ {
+ while (*from && *from != '*'
+ && *from != '\n' && *from != '\r')
+ from++;
+ if (*from != '*' || from[1] == '/')
+ break;
+ from++;
+ }
+ while (1);
+ }
+ else
+ while (*from && *from != '\n' && *from != '\r')
+ from++;
+ }
}
/* C block comment. */
if (*comment_start == '*')
--- gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c.jj 2016-09-30
17:35:47.908674464 +0200
+++ gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c 2016-09-30
17:39:41.833766297 +0200
@@ -21,15 +21,39 @@ foo (int i)
case 4:
bar (4);
break;
+ case 5:
+ bar (5); /* { dg-bogus "this statement may \[laf]*
through" } */
+ /* Else Fall-Thru! */
+ case 6:
+ bar (6);
+ break;
case 7:
bar (7); /* { dg-bogus "this statement may \[laf]*
through" } */
/* Some comment. */
- /* fallthrough. */
+ /* ... fallthrough ... */
/* Some other comment. */
/* And yet another. */
case 8:
bar (8);
break;
+ case 9:
+ bar (9); /* { dg-bogus "this statement may \[laf]*
through" } */
+ /* Intentional Fallthru */
+ case 10:
+ bar (10);
+ break;
+ case 11:
+ bar (11); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /* intentionally fall through */
+ case 12:
+ bar (12);
+ break;
+ case 13:
+ bar (13); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /* Falls Through - for reasons known only to the author. */
+ case 14:
+ bar (14);
+ break;
case 15:
bar (15); /* { dg-bogus "this statement may
\[laf]* through" } */
/*-fallthrough*/
@@ -42,12 +66,42 @@ foo (int i)
case 18:
bar (18);
break;
+ case 19:
+ bar (19); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*lint -fallthrough*/
+ case 20:
+ bar (20);
+ break;
+ case 21:
+ bar (21); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*lint -fallthrough */
+ case 22:
+ bar (22);
+ break;
case 23:
bar (23); /* { dg-bogus "this statement may
\[laf]* through" } */
/*fallthru*/
case 24:
bar (24);
break;
+ case 25:
+ bar (25); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*Else fallthru*/
+ case 26:
+ bar (26);
+ break;
+ case 27:
+ bar (27); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*Intentional fallthru*/
+ case 28:
+ bar (28);
+ break;
+ case 29:
+ bar (29); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /*Intentionally fallthru*/
+ case 30:
+ bar (30);
+ break;
case 31:
bar (31); /* { dg-bogus "this statement may
\[laf]* through" } */
/*Falls thru*/
@@ -78,15 +132,39 @@ foo (int i)
case 4:
bar (4);
break;
+ case 5:
+ bar (5); /* { dg-bogus "this statement may \[laf]*
through" } */
+ // Else Fall-Thru!
+ case 6:
+ bar (6);
+ break;
case 7:
bar (7); /* { dg-bogus "this statement may \[laf]*
through" } */
// Some comment.
- // fallthrough
+ // ... fallthrough ...
// Some other comment.
// And yet another.
case 8:
bar (8);
break;
+ case 9:
+ bar (9); /* { dg-bogus "this statement may \[laf]*
through" } */
+ // Intentional Fallthru
+ case 10:
+ bar (10);
+ break;
+ case 11:
+ bar (11); /* { dg-bogus "this statement may
\[laf]* through" } */
+ // intentionally fall through
+ case 12:
+ bar (12);
+ break;
+ case 13:
+ bar (13); /* { dg-bogus "this statement may
\[laf]* through" } */
+ // Falls Through - for reasons known only to the author.
+ case 14:
+ bar (14);
+ break;
case 15:
bar (15); /* { dg-bogus "this statement may
\[laf]* through" } */
//-fallthrough
@@ -99,12 +177,42 @@ foo (int i)
case 18:
bar (18);
break;
+ case 19:
+ bar (19); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //lint -fallthrough
+ case 20:
+ bar (20);
+ break;
+ case 21:
+ bar (21); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //lint -fallthrough
+ case 22:
+ bar (22);
+ break;
case 23:
bar (23); /* { dg-bogus "this statement may
\[laf]* through" } */
//fallthru
case 24:
bar (24);
break;
+ case 25:
+ bar (25); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //Else fallthru
+ case 26:
+ bar (26);
+ break;
+ case 27:
+ bar (27); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //Intentional fallthru
+ case 28:
+ bar (28);
+ break;
+ case 29:
+ bar (29); /* { dg-bogus "this statement may
\[laf]* through" } */
+ //Intentionally fallthru
+ case 30:
+ bar (30);
+ break;
case 31:
bar (31); /* { dg-bogus "this statement may
\[laf]* through" } */
//Falls thru
2016-09-30 Jakub Jelinek <[email protected]>
* doc/invoke.texi: Document accepting Else, fallthrough.
* lex.c (fallthrough_comment_p): Accept Else, fallthrough.
* c-c++-common/Wimplicit-fallthrough-22.c (foo): Add further tests.
--- gcc/doc/invoke.texi.jj 2016-09-30 17:09:37.170216652 +0200
+++ gcc/doc/invoke.texi 2016-09-30 16:27:10.565840611 +0200
@@ -4168,11 +4168,11 @@ should match one of the following regula
@item @code{lint -fallthrough ?}
-@item @code{[ \t.!]*(ELSE |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?}
+@item @code{[ \t.!]*(ELSE,? |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?}
-@item @code{[ \t.!]*(Else |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[
\t.!]*(-[^\n\r]*)?}
+@item @code{[ \t.!]*(Else,? |Intentional(ly)? )?Fall((s |
|-)[Tt]|t)hr(ough|u)[ \t.!]*(-[^\n\r]*)?}
-@item @code{[ \t.!]*([Ee]lse |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[
\t.!]*(-[^\n\r]*)?}
+@item @code{[ \t.!]*([Ee]lse,? |[Ii]ntentional(ly)? )?fall(s |
|-)?thr(ough|u)[ \t.!]*(-[^\n\r]*)?}
@end itemize
--- libcpp/lex.c.jj 2016-09-30 17:09:37.171216639 +0200
+++ libcpp/lex.c 2016-09-30 16:30:52.048091615 +0200
@@ -2073,9 +2073,9 @@ fallthrough_comment_p (cpp_reader *pfile
from++;
}
/* Whole comment contents (regex):
- [ \t.!]*(ELSE |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?
- [ \t.!]*(Else |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[
\t.!]*(-[^\n\r]*)?
- [ \t.!]*([Ee]lse |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[
\t.!]*(-[^\n\r]*)?
+ [ \t.!]*(ELSE,? |INTENTIONAL(LY)? )?FALL(S | |-)?THR(OUGH|U)[
\t.!]*(-[^\n\r]*)?
+ [ \t.!]*(Else,? |Intentional(ly)? )?Fall((s | |-)[Tt]|t)hr(ough|u)[
\t.!]*(-[^\n\r]*)?
+ [ \t.!]*([Ee]lse,? |[Ii]ntentional(ly)? )?fall(s | |-)?thr(ough|u)[
\t.!]*(-[^\n\r]*)?
*/
else
{
@@ -2088,11 +2088,18 @@ fallthrough_comment_p (cpp_reader *pfile
if ((size_t) (pfile->buffer->cur - from)
< sizeof "else fallthru" - 1)
return false;
- if (f == 'E' && memcmp (from + 1, "LSE F", sizeof "LSE F" - 1) == 0)
+ if (f == 'E' && memcmp (from + 1, "LSE", sizeof "LSE" - 1) == 0)
all_upper = true;
- else if (memcmp (from + 1, "lse ", sizeof "lse " - 1))
+ else if (memcmp (from + 1, "lse", sizeof "lse" - 1))
+ return false;
+ from += sizeof "else" - 1;
+ if (*from == ',')
+ from++;
+ if (*from != ' ')
+ return false;
+ from++;
+ if (all_upper && *from == 'f')
return false;
- from += sizeof "else " - 1;
if (f == 'e' && *from == 'F')
return false;
f = *from;
--- gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c.jj 2016-09-30
17:09:37.172216627 +0200
+++ gcc/testsuite/c-c++-common/Wimplicit-fallthrough-22.c 2016-09-30
16:32:20.866989186 +0200
@@ -114,6 +114,12 @@ foo (int i)
case 34:
bar (34);
break;
+ case 35:
+ bar (35); /* { dg-bogus "this statement may
\[laf]* through" } */
+ /* Else, fall-through. */
+ case 36:
+ bar (36);
+ break;
default:
break;
}
@@ -225,6 +231,12 @@ foo (int i)
case 34:
bar (34);
break;
+ case 35:
+ bar (35); /* { dg-bogus "this statement may
\[laf]* through" } */
+ // Else, fall-through
+ case 36:
+ bar (36);
+ break;
default:
break;
}
