clang/SOURCES/0003-Misleading-unicode-identifier-detection-pass.patch

From dbfbbab65139552549604931dfa2759c9aa392de Mon Sep 17 00:00:00 2001
From: serge-sans-paille <sguelton@redhat.com>
Date: Fri, 15 Oct 2021 15:18:52 +0200
Subject: [PATCH 3/3] Misleading unicode identifier detection pass
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Detect when an identifier contains some Right-To-Left characters.
This pass relates to https://trojansource.codes/

Example of misleading source:

    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);
    }

This is a recommit of 299aa4dfa1d8c120648b1404b481d858b76c8173 with missing
option registration fixed.

Differential Revision: https://reviews.llvm.org/D112914
---
 clang-tools-extra/clang-tidy/misc/CMakeLists.txt   |   1 +
 .../clang-tidy/misc/MiscTidyModule.cpp             |   3 +
 .../clang-tidy/misc/MisleadingIdentifier.cpp       | 166 +++++++++++++++++++++
 .../clang-tidy/misc/MisleadingIdentifier.h         |  31 ++++
 clang-tools-extra/docs/ReleaseNotes.rst            |   4 +
 clang-tools-extra/docs/clang-tidy/checks/list.rst  |   1 +
 .../checks/misc-misleading-identifier.rst          |  23 +++
 .../checkers/misc-misleading-identifier.cpp        |  15 ++
 8 files changed, 244 insertions(+)
 create mode 100644 clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp
 create mode 100644 clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.h
 create mode 100644 clang-tools-extra/docs/clang-tidy/checks/misc-misleading-identifier.rst
 create mode 100644 clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp

diff --git a/clang-tools-extra/clang-tidy/misc/CMakeLists.txt b/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
index e6abac8..22d1659 100644
--- a/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/misc/CMakeLists.txt
@@ -17,6 +17,7 @@ add_clang_library(clangTidyMiscModule
   Homoglyph.cpp
   MiscTidyModule.cpp
   MisleadingBidirectional.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 bb5fde2..b484db8 100644
--- a/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/misc/MiscTidyModule.cpp
@@ -12,6 +12,7 @@
 #include "DefinitionsInHeadersCheck.h"
 #include "Homoglyph.h"
 #include "MisleadingBidirectional.h"
+#include "MisleadingIdentifier.h"
 #include "MisplacedConstCheck.h"
 #include "NewDeleteOverloadsCheck.h"
 #include "NoRecursionCheck.h"
@@ -38,6 +39,8 @@ public:
     CheckFactories.registerCheck<Homoglyph>("misc-homoglyph");
     CheckFactories.registerCheck<MisleadingBidirectionalCheck>(
         "misc-misleading-bidirectional");
+    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 0000000..4ddb8ba
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/misc/MisleadingIdentifier.cpp
@@ -0,0 +1,166 @@
+//===--- 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")) {
+    IdentifierInfo *II = ND->getIdentifier();
+    if (II) {
+      StringRef NDName = II->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 0000000..9580ae6
--- /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 1eec7db..07977d0 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -223,6 +223,10 @@ New checks
   Inspect string literal and comments for unterminated bidirectional Unicode
   characters.
 
+- 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 b118639..592d69b 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -209,6 +209,7 @@ Clang-Tidy Checks
    `misc-definitions-in-headers <misc-definitions-in-headers.html>`_, "Yes"
    `misc-homoglyph <misc-homoglyph.html>`_,
    `misc-misleading-bidirectional <misc-misleading-bidirectional.html>`_,
+   `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>`_,
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 0000000..8bd9999
--- /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/checkers/misc-misleading-identifier.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc-misleading-identifier.cpp
new file mode 100644
index 0000000..cb036f9
--- /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);
+}
-- 
1.8.3.1