Issue 4861041: Make a more descriptive warning when comparing NULL with non-pointer

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Issue 4861041: Make a more descriptive warning when comparing NULL with non-pointer (Closed)

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Created:
13 years, 3 months ago by rtrieu

Modified:
13 years, 3 months ago

Reviewers:
chandlerc

Base URL:
https://llvm.org/svn/llvm-project/cfe/trunk/

Visibility:
Public.

Patch Set 1 #

Total comments: 2

Created: 13 years, 3 months ago

Download [raw] [tar.bz2]

	Unified diffs	Side-by-side diffs	Stats (+15 lines, -10 lines)			Patch
M	include/clang/Basic/DiagnosticSemaKinds.td	View	1 chunk	+4 lines, -0 lines	2 comments	Download
M	lib/Sema/SemaExpr.cpp	View	1 chunk	+4 lines, -3 lines	0 comments	Download
M	test/SemaCXX/null_in_arithmetic_ops.cpp	View	2 chunks	+7 lines, -7 lines	0 comments	Download

Messages

Total messages: 2

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chandlerc

http://codereview.appspot.com/4861041/diff/1/include/clang/Basic/DiagnosticSemaKinds.td File include/clang/Basic/DiagnosticSemaKinds.td (right): http://codereview.appspot.com/4861041/diff/1/include/clang/Basic/DiagnosticSemaKinds.td#newcode3168 include/clang/Basic/DiagnosticSemaKinds.td:3168: "%select{(%1 and NULL)|(NULL and %1)}0">, Why repeat the NULL ...

13 years, 3 months ago (2011-08-11 01:32:13 UTC) #1

rtrieu

13 years, 3 months ago (2011-08-11 01:44:30 UTC) #2

http://codereview.appspot.com/4861041/diff/1/include/clang/Basic/DiagnosticSe...
File include/clang/Basic/DiagnosticSemaKinds.td (right):

http://codereview.appspot.com/4861041/diff/1/include/clang/Basic/DiagnosticSe...
include/clang/Basic/DiagnosticSemaKinds.td:3168: "%select{(%1 and NULL)|(NULL
and %1)}0">,
On 2011/08/11 01:32:14, chandlerc wrote:
> Why repeat the NULL here? Maybe just "... between NULL and non-pointer %1'.
Also
> I wonder if we want to spell NULL the way the user did (NULL vs. (void*)0 vs.
> nullptr).

The NULL is repeated since many other warnings on binary operations will have
('type1' and 'type2') so this is to be consistent with them.

This warning checks for a GNUNullExpr, so it won't trigger on (void*)0 or
nullptr.  In those cases, a separate error will be emitted.  I believe it will
trigger on __null, but I don't think that is commonly used.

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