[clang-tools-extra] 7f92a1a - Misleading unicode identifier detection pass
via cfe-commits
cfe-commits at lists.llvm.org
Tue Nov 9 12:47:05 PST 2021
Author: serge-sans-paille
Date: 2021-11-09T21:46:35+01:00
New Revision: 7f92a1a84b96ff0b7568a35704c9483e9f24f057
URL: https://github.com/llvm/llvm-project/commit/7f92a1a84b96ff0b7568a35704c9483e9f24f057
DIFF: https://github.com/llvm/llvm-project/commit/7f92a1a84b96ff0b7568a35704c9483e9f24f057.diff
LOG: Misleading unicode identifier detection pass
Detect when an identifier contains some Right-To-Left characters.
This pass relates to https://trojansource.codes/
This is a recommit of 299aa4dfa1d8c120648b1404b481d858b76c8173 with missing
option registration fixed.
Differential Revision: https://reviews.llvm.org/D112914
Added:
clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp
clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.h
clang-tools-extra/docs/clang-tidy/checks/misc-misleading-identifier.rst
clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp
Modified:
clang-tools-extra/clang-tidy/misc/CMakeLists.txt
clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
clang-tools-extra/docs/ReleaseNotes.rst
clang-tools-extra/docs/clang-tidy/checks/list.rst
clang-tools-extra/test/clang-tidy/check_clang_tidy.py
Removed:
################################################################################
diff --git a/clang-tools-extra/clang-tidy/misc/CMakeLists.txt b/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
index 880b7aacdc65a..22213481619c5 100644
--- a/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
@@ -6,6 +6,7 @@ set(LLVM_LINK_COMPONENTS
add_clang_library(clangTidyMiscModule
DefinitionsInHeadersCheck.cpp
MiscTidyModule.cpp
+ MisleadingIdentifier.cpp
MisplacedConstCheck.cpp
NewDeleteOverloadsCheck.cpp
NoRecursionCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp b/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
index e06768c548bda..2defecc60741a 100644
--- a/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
@@ -10,6 +10,7 @@
#include "../ClangTidyModule.h"
#include "../ClangTidyModuleRegistry.h"
#include "DefinitionsInHeadersCheck.h"
+#include "MisleadingIdentifier.h"
#include "MisplacedConstCheck.h"
#include "NewDeleteOverloadsCheck.h"
#include "NoRecursionCheck.h"
@@ -33,6 +34,8 @@ class MiscModule : public ClangTidyModule {
void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
CheckFactories.registerCheck<DefinitionsInHeadersCheck>(
"misc-definitions-in-headers");
+ CheckFactories.registerCheck<MisleadingIdentifierCheck>(
+ "misc-misleading-identifier");
CheckFactories.registerCheck<MisplacedConstCheck>("misc-misplaced-const");
CheckFactories.registerCheck<NewDeleteOverloadsCheck>(
"misc-new-delete-overloads");
diff --git a/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp b/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp
new file mode 100644
index 0000000000000..f9b30755a3cae
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp
@@ -0,0 +1,163 @@
+//===--- MisleadingIdentifier.cpp - clang-tidy-----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "MisleadingIdentifier.h"
+
+#include "clang/Frontend/CompilerInstance.h"
+#include "llvm/Support/ConvertUTF.h"
+
+namespace clang {
+namespace tidy {
+namespace misc {
+
+// See https://www.unicode.org/Public/14.0.0/ucd/extracted/DerivedBidiClass.txt
+static bool isUnassignedAL(llvm::UTF32 CP) {
+ return (0x0600 <= CP && CP <= 0x07BF) || (0x0860 <= CP && CP <= 0x08FF) ||
+ (0xFB50 <= CP && CP <= 0xFDCF) || (0xFDF0 <= CP && CP <= 0xFDFF) ||
+ (0xFE70 <= CP && CP <= 0xFEFF) ||
+ (0x00010D00 <= CP && CP <= 0x00010D3F) ||
+ (0x00010F30 <= CP && CP <= 0x00010F6F) ||
+ (0x0001EC70 <= CP && CP <= 0x0001ECBF) ||
+ (0x0001ED00 <= CP && CP <= 0x0001ED4F) ||
+ (0x0001EE00 <= CP && CP <= 0x0001EEFF);
+}
+
+// See https://www.unicode.org/Public/14.0.0/ucd/extracted/DerivedBidiClass.txt
+static bool isUnassignedR(llvm::UTF32 CP) {
+ return (0x0590 <= CP && CP <= 0x05FF) || (0x07C0 <= CP && CP <= 0x085F) ||
+ (0xFB1D <= CP && CP <= 0xFB4F) ||
+ (0x00010800 <= CP && CP <= 0x00010CFF) ||
+ (0x00010D40 <= CP && CP <= 0x00010F2F) ||
+ (0x00010F70 <= CP && CP <= 0x00010FFF) ||
+ (0x0001E800 <= CP && CP <= 0x0001EC6F) ||
+ (0x0001ECC0 <= CP && CP <= 0x0001ECFF) ||
+ (0x0001ED50 <= CP && CP <= 0x0001EDFF) ||
+ (0x0001EF00 <= CP && CP <= 0x0001EFFF);
+}
+
+// See https://www.unicode.org/Public/14.0.0/ucd/extracted/DerivedBidiClass.txt
+static bool isR(llvm::UTF32 CP) {
+ return (CP == 0x0590) || (CP == 0x05BE) || (CP == 0x05C0) || (CP == 0x05C3) ||
+ (CP == 0x05C6) || (0x05C8 <= CP && CP <= 0x05CF) ||
+ (0x05D0 <= CP && CP <= 0x05EA) || (0x05EB <= CP && CP <= 0x05EE) ||
+ (0x05EF <= CP && CP <= 0x05F2) || (0x05F3 <= CP && CP <= 0x05F4) ||
+ (0x05F5 <= CP && CP <= 0x05FF) || (0x07C0 <= CP && CP <= 0x07C9) ||
+ (0x07CA <= CP && CP <= 0x07EA) || (0x07F4 <= CP && CP <= 0x07F5) ||
+ (CP == 0x07FA) || (0x07FB <= CP && CP <= 0x07FC) ||
+ (0x07FE <= CP && CP <= 0x07FF) || (0x0800 <= CP && CP <= 0x0815) ||
+ (CP == 0x081A) || (CP == 0x0824) || (CP == 0x0828) ||
+ (0x082E <= CP && CP <= 0x082F) || (0x0830 <= CP && CP <= 0x083E) ||
+ (CP == 0x083F) || (0x0840 <= CP && CP <= 0x0858) ||
+ (0x085C <= CP && CP <= 0x085D) || (CP == 0x085E) || (CP == 0x085F) ||
+ (CP == 0x200F) || (CP == 0xFB1D) || (0xFB1F <= CP && CP <= 0xFB28) ||
+ (0xFB2A <= CP && CP <= 0xFB36) || (CP == 0xFB37) ||
+ (0xFB38 <= CP && CP <= 0xFB3C) || (CP == 0xFB3D) || (CP == 0xFB3E) ||
+ (CP == 0xFB3F) || (0xFB40 <= CP && CP <= 0xFB41) || (CP == 0xFB42) ||
+ (0xFB43 <= CP && CP <= 0xFB44) || (CP == 0xFB45) ||
+ (0xFB46 <= CP && CP <= 0xFB4F) || (0x10800 <= CP && CP <= 0x10805) ||
+ (0x10806 <= CP && CP <= 0x10807) || (CP == 0x10808) ||
+ (CP == 0x10809) || (0x1080A <= CP && CP <= 0x10835) ||
+ (CP == 0x10836) || (0x10837 <= CP && CP <= 0x10838) ||
+ (0x10839 <= CP && CP <= 0x1083B) || (CP == 0x1083C) ||
+ (0x1083D <= CP && CP <= 0x1083E) || (0x1083F <= CP && CP <= 0x10855) ||
+ (CP == 0x10856) || (CP == 0x10857) ||
+ (0x10858 <= CP && CP <= 0x1085F) || (0x10860 <= CP && CP <= 0x10876) ||
+ (0x10877 <= CP && CP <= 0x10878) || (0x10879 <= CP && CP <= 0x1087F) ||
+ (0x10880 <= CP && CP <= 0x1089E) || (0x1089F <= CP && CP <= 0x108A6) ||
+ (0x108A7 <= CP && CP <= 0x108AF) || (0x108B0 <= CP && CP <= 0x108DF) ||
+ (0x108E0 <= CP && CP <= 0x108F2) || (CP == 0x108F3) ||
+ (0x108F4 <= CP && CP <= 0x108F5) || (0x108F6 <= CP && CP <= 0x108FA) ||
+ (0x108FB <= CP && CP <= 0x108FF) || (0x10900 <= CP && CP <= 0x10915) ||
+ (0x10916 <= CP && CP <= 0x1091B) || (0x1091C <= CP && CP <= 0x1091E) ||
+ (0x10920 <= CP && CP <= 0x10939) || (0x1093A <= CP && CP <= 0x1093E) ||
+ (CP == 0x1093F) || (0x10940 <= CP && CP <= 0x1097F) ||
+ (0x10980 <= CP && CP <= 0x109B7) || (0x109B8 <= CP && CP <= 0x109BB) ||
+ (0x109BC <= CP && CP <= 0x109BD) || (0x109BE <= CP && CP <= 0x109BF) ||
+ (0x109C0 <= CP && CP <= 0x109CF) || (0x109D0 <= CP && CP <= 0x109D1) ||
+ (0x109D2 <= CP && CP <= 0x109FF) || (CP == 0x10A00) ||
+ (CP == 0x10A04) || (0x10A07 <= CP && CP <= 0x10A0B) ||
+ (0x10A10 <= CP && CP <= 0x10A13) || (CP == 0x10A14) ||
+ (0x10A15 <= CP && CP <= 0x10A17) || (CP == 0x10A18) ||
+ (0x10A19 <= CP && CP <= 0x10A35) || (0x10A36 <= CP && CP <= 0x10A37) ||
+ (0x10A3B <= CP && CP <= 0x10A3E) || (0x10A40 <= CP && CP <= 0x10A48) ||
+ (0x10A49 <= CP && CP <= 0x10A4F) || (0x10A50 <= CP && CP <= 0x10A58) ||
+ (0x10A59 <= CP && CP <= 0x10A5F) || (0x10A60 <= CP && CP <= 0x10A7C) ||
+ (0x10A7D <= CP && CP <= 0x10A7E) || (CP == 0x10A7F) ||
+ (0x10A80 <= CP && CP <= 0x10A9C) || (0x10A9D <= CP && CP <= 0x10A9F) ||
+ (0x10AA0 <= CP && CP <= 0x10ABF) || (0x10AC0 <= CP && CP <= 0x10AC7) ||
+ (CP == 0x10AC8) || (0x10AC9 <= CP && CP <= 0x10AE4) ||
+ (0x10AE7 <= CP && CP <= 0x10AEA) || (0x10AEB <= CP && CP <= 0x10AEF) ||
+ (0x10AF0 <= CP && CP <= 0x10AF6) || (0x10AF7 <= CP && CP <= 0x10AFF) ||
+ (0x10B00 <= CP && CP <= 0x10B35) || (0x10B36 <= CP && CP <= 0x10B38) ||
+ (0x10B40 <= CP && CP <= 0x10B55) || (0x10B56 <= CP && CP <= 0x10B57) ||
+ (0x10B58 <= CP && CP <= 0x10B5F) || (0x10B60 <= CP && CP <= 0x10B72) ||
+ (0x10B73 <= CP && CP <= 0x10B77) || (0x10B78 <= CP && CP <= 0x10B7F) ||
+ (0x10B80 <= CP && CP <= 0x10B91) || (0x10B92 <= CP && CP <= 0x10B98) ||
+ (0x10B99 <= CP && CP <= 0x10B9C) || (0x10B9D <= CP && CP <= 0x10BA8) ||
+ (0x10BA9 <= CP && CP <= 0x10BAF) || (0x10BB0 <= CP && CP <= 0x10BFF) ||
+ (0x10C00 <= CP && CP <= 0x10C48) || (0x10C49 <= CP && CP <= 0x10C7F) ||
+ (0x10C80 <= CP && CP <= 0x10CB2) || (0x10CB3 <= CP && CP <= 0x10CBF) ||
+ (0x10CC0 <= CP && CP <= 0x10CF2) || (0x10CF3 <= CP && CP <= 0x10CF9) ||
+ (0x10CFA <= CP && CP <= 0x10CFF) || (0x10D40 <= CP && CP <= 0x10E5F) ||
+ (CP == 0x10E7F) || (0x10E80 <= CP && CP <= 0x10EA9) ||
+ (CP == 0x10EAA) || (CP == 0x10EAD) ||
+ (0x10EAE <= CP && CP <= 0x10EAF) || (0x10EB0 <= CP && CP <= 0x10EB1) ||
+ (0x10EB2 <= CP && CP <= 0x10EFF) || (0x10F00 <= CP && CP <= 0x10F1C) ||
+ (0x10F1D <= CP && CP <= 0x10F26) || (CP == 0x10F27) ||
+ (0x10F28 <= CP && CP <= 0x10F2F) || (0x10F70 <= CP && CP <= 0x10F81) ||
+ (0x10F86 <= CP && CP <= 0x10F89) || (0x10F8A <= CP && CP <= 0x10FAF) ||
+ (0x10FB0 <= CP && CP <= 0x10FC4) || (0x10FC5 <= CP && CP <= 0x10FCB) ||
+ (0x10FCC <= CP && CP <= 0x10FDF) || (0x10FE0 <= CP && CP <= 0x10FF6) ||
+ (0x10FF7 <= CP && CP <= 0x10FFF) || (0x1E800 <= CP && CP <= 0x1E8C4) ||
+ (0x1E8C5 <= CP && CP <= 0x1E8C6) || (0x1E8C7 <= CP && CP <= 0x1E8CF) ||
+ (0x1E8D7 <= CP && CP <= 0x1E8FF) || (0x1E900 <= CP && CP <= 0x1E943) ||
+ (CP == 0x1E94B) || (0x1E94C <= CP && CP <= 0x1E94F) ||
+ (0x1E950 <= CP && CP <= 0x1E959) || (0x1E95A <= CP && CP <= 0x1E95D) ||
+ (0x1E95E <= CP && CP <= 0x1E95F) || (0x1E960 <= CP && CP <= 0x1EC6F) ||
+ (0x1ECC0 <= CP && CP <= 0x1ECFF) || (0x1ED50 <= CP && CP <= 0x1EDFF);
+}
+
+static bool hasRTLCharacters(StringRef Buffer) {
+ const char *CurPtr = Buffer.begin();
+ const char *EndPtr = Buffer.end();
+ while (CurPtr < EndPtr) {
+ llvm::UTF32 CodePoint;
+ llvm::ConversionResult Result = llvm::convertUTF8Sequence(
+ (const llvm::UTF8 **)&CurPtr, (const llvm::UTF8 *)EndPtr, &CodePoint,
+ llvm::strictConversion);
+ if (Result != llvm::conversionOK)
+ break;
+ if (isUnassignedAL(CodePoint) || isUnassignedR(CodePoint) || isR(CodePoint))
+ return true;
+ }
+ return false;
+}
+
+MisleadingIdentifierCheck::MisleadingIdentifierCheck(StringRef Name,
+ ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+
+MisleadingIdentifierCheck::~MisleadingIdentifierCheck() = default;
+
+void MisleadingIdentifierCheck::check(
+ const ast_matchers::MatchFinder::MatchResult &Result) {
+ if (const auto *ND = Result.Nodes.getNodeAs<NamedDecl>("nameddecl")) {
+ StringRef NDName = ND->getName();
+ if (hasRTLCharacters(NDName))
+ diag(ND->getBeginLoc(), "identifier has right-to-left codepoints");
+ }
+}
+
+void MisleadingIdentifierCheck::registerMatchers(
+ ast_matchers::MatchFinder *Finder) {
+ Finder->addMatcher(ast_matchers::namedDecl().bind("nameddecl"), this);
+}
+
+} // namespace misc
+} // namespace tidy
+} // namespace clang
diff --git a/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.h b/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.h
new file mode 100644
index 0000000000000..9580ae6252714
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.h
@@ -0,0 +1,31 @@
+//===--- MisleadingIdentifierCheck.h - clang-tidy ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_MISLEADINGIDENTIFIERCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_MISLEADINGIDENTIFIERCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang {
+namespace tidy {
+namespace misc {
+
+class MisleadingIdentifierCheck : public ClangTidyCheck {
+public:
+ MisleadingIdentifierCheck(StringRef Name, ClangTidyContext *Context);
+ ~MisleadingIdentifierCheck();
+
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace misc
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_MISLEADINGIDENTIFIERCHECK_H
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 41934d8fb9055..0019f574802fd 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -101,12 +101,15 @@ New checks
Reports identifiers whose names are too short. Currently checks local
variables and function parameters only.
-
- New :doc:`readability-data-pointer <clang-tidy/checks/readability-data-pointer>` check.
Finds cases where code could use ``data()`` rather than the address of the
element at index 0 in a container.
+- New :doc:`misc-misleading-identifier <clang-tidy/checks/misc-misleading-identifier>` check.
+
+ Reports identifier with unicode right-to-left characters.
+
New check aliases
^^^^^^^^^^^^^^^^^
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index c9b4daf42ef04..80a9639c2dddc 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -212,6 +212,7 @@ Clang-Tidy Checks
`llvmlibc-implementation-in-namespace <llvmlibc-implementation-in-namespace.html>`_,
`llvmlibc-restrict-system-libc-headers <llvmlibc-restrict-system-libc-headers.html>`_, "Yes"
`misc-definitions-in-headers <misc-definitions-in-headers.html>`_, "Yes"
+ `misc-misleading-identifier <misc-mileading-identifier.html>`_,
`misc-misplaced-const <misc-misplaced-const.html>`_,
`misc-new-delete-overloads <misc-new-delete-overloads.html>`_,
`misc-no-recursion <misc-no-recursion.html>`_,
@@ -449,4 +450,4 @@ Clang-Tidy Checks
`hicpp-vararg <hicpp-vararg.html>`_, `cppcoreguidelines-pro-type-vararg <cppcoreguidelines-pro-type-vararg.html>`_,
`llvm-else-after-return <llvm-else-after-return.html>`_, `readability-else-after-return <readability-else-after-return.html>`_, "Yes"
`llvm-qualified-auto <llvm-qualified-auto.html>`_, `readability-qualified-auto <readability-qualified-auto.html>`_, "Yes"
-
\ No newline at end of file
+
diff --git a/clang-tools-extra/docs/clang-tidy/checks/misc-misleading-identifier.rst b/clang-tools-extra/docs/clang-tidy/checks/misc-misleading-identifier.rst
new file mode 100644
index 0000000000000..8bd99998d9b50
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/misc-misleading-identifier.rst
@@ -0,0 +1,23 @@
+.. title:: clang-tidy - misc-misleading-identifier
+
+misc-misleading-identifier
+==========================
+
+Finds identifiers that contain Unicode characters with right-to-left direction,
+which can be confusing as they may change the understanding of a whole statement
+line, as described in `Trojan Source <https://trojansource.codes>`_.
+
+An example of such misleading code follows:
+
+.. code-block:: c
+
+ #include <stdio.h>
+
+ short int א = (short int)0;
+ short int ג = (short int)12345;
+
+ int main() {
+ int א = ג; // a local variable, set to zero?
+ printf("ג is %d\n", ג);
+ printf("א is %d\n", א);
+ }
diff --git a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
index 5ebe3a1c14911..4edae67f70763 100755
--- a/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
+++ b/clang-tools-extra/test/clang-tidy/check_clang_tidy.py
@@ -34,7 +34,7 @@
def write_file(file_name, text):
- with open(file_name, 'w') as f:
+ with open(file_name, 'w', encoding='utf-8') as f:
f.write(text)
f.truncate()
@@ -82,7 +82,7 @@ def run_test_once(args, extra_args):
if resource_dir is not None:
clang_extra_args.append('-resource-dir=%s' % resource_dir)
- with open(input_file_name, 'r') as input_file:
+ with open(input_file_name, 'r', encoding='utf-8') as input_file:
input_text = input_file.read()
check_fixes_prefixes = []
@@ -150,9 +150,9 @@ def run_test_once(args, extra_args):
print('clang-tidy failed:\n' + e.output.decode())
raise
- print('------------------------ clang-tidy output -----------------------\n' +
- clang_tidy_output +
- '\n------------------------------------------------------------------')
+ print('------------------------ clang-tidy output -----------------------')
+ print(clang_tidy_output.encode())
+ print('\n------------------------------------------------------------------')
try:
diff _output = subprocess.check_output(
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp
new file mode 100644
index 0000000000000..cb036f96dfee1
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp
@@ -0,0 +1,15 @@
+// RUN: %check_clang_tidy %s misc-misleading-identifier %t
+
+#include <stdio.h>
+
+// CHECK-MESSAGES: :[[#@LINE+1]]:1: warning: identifier has right-to-left codepoints [misc-misleading-identifier]
+short int א = (short int)0;
+// CHECK-MESSAGES: :[[#@LINE+1]]:1: warning: identifier has right-to-left codepoints [misc-misleading-identifier]
+short int ג = (short int)12345;
+
+int main() {
+ // CHECK-MESSAGES: :[[#@LINE+1]]:3: warning: identifier has right-to-left codepoints [misc-misleading-identifier]
+ int א = ג; // a local variable, set to zero?
+ printf("ג is %d\n", ג);
+ printf("א is %d\n", א);
+}
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