linux-kernel - [PATCH] [checkpatch.pl] ctx_statement

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Date:	Thu, 15 May 2014 16:43:15 +0200
From:	Ivo Sieben <meltedpianoman@...il.com>
To:	<linux-kernel@...r.kernel.org>, Andy Whitcroft <apw@...onical.com>,
	"Joe Perches" <joe@...ches.com>
CC:	Ivo Sieben <meltedpianoman@...il.com>
Subject: [PATCH] [checkpatch.pl] ctx_statement_block #if/#else/#endif fix

When picking up a complete statement block #if/#else/#endif prepocesor
boundaries are taken into account by pushing current level & type on a stack.
But on an #else the level was read from stack again (without actually popping it
from stack) causing the statement block to end too early on the next ';'.
Fixed this.

For example the following code:

 	if (!test()) {
 #ifdef NEVER
 		foo();
 		bar();
 #else
 		bar();
 		foo();
 #endif
 	}

Results in statement block:

 STATEMENT<+    if (!test()) {
 +#ifdef NEVER
 +              foo();
 +              bar();
 +#else
 +              bar();>
 CONDITION<+    if (!test())>

While you would expect:

 STATEMENT<+    if (!test()) {
 +#ifdef NEVER
 +              foo();
 +              bar();
 +#else
 +              bar();
 +              foo();
 +#endif
 +       }>
 CONDITION<+     if (!test())>

Signed-off-by: Ivo Sieben <meltedpianoman@...il.com>
---

Request for comments:
I think I fixed a problem here that I encountered while I was working on another
changeset in which I check the statement block after a condition.
Somehow the statement block did not contain everything I expected.

 scripts/checkpatch.pl |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34eb216..e7bca89 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -878,7 +878,7 @@ sub ctx_statement_block {
 		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 			push(@stack, [ $type, $level ]);
 		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
-			($type, $level) = @{$stack[$#stack - 1]};
+			# no changes to stack: type & level remain the same
 		} elsif ($remainder =~ /^#\s*endif\b/) {
 			($type, $level) = @{pop(@stack)};
 		}
@@ -1050,7 +1050,7 @@ sub ctx_block_get {
 		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 			push(@stack, $level);
 		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
-			$level = $stack[$#stack - 1];
+			# no changes to stack: type & level remain the same
 		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 			$level = pop(@stack);
 		}
-- 
1.7.9.5

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