Improve NumericLiteral exclusion coverage and polish QLDoc wording

change_notes/2026-05-21-fix-fp-rule-5-13-4.md

@@ -0,0 +1,5 @@
+- `RULE-5-13-4`, `M2-13-3` - `UnsignedIntegerLiteralsNotAppropriatelySuffixed.ql`, `MissingUSuffix.ql`:
+  - Remove FPs in user-defined literals and template instantiations.
+- `M2-13-3` - `cpp/autosar/missing-u-suffix`:
+  - Remove FPs in user-defined literals and template instantiations.
+

cpp/common/src/codingstandards/cpp/Cpp14Literal.qll

@@ -5,9 +5,20 @@
  */
 module Cpp14Literal {
   private import cpp as StandardLibrary
-
-  /** An numeric literal. */
-  abstract class NumericLiteral extends StandardLibrary::Literal { }
+  private import codingstandards.cpp.UserDefinedLiteral
+
+  /** A numeric literal. */
+  abstract class NumericLiteral extends StandardLibrary::Literal {
+    NumericLiteral() {
+      // exclude user-defined literals as they define custom suffixes
+      not exists(StandardLibrary::FunctionCall fc |
+        this = fc.getArgument(0) and
+        fc.getTarget() instanceof UserDefinedLiteral
+      ) and
+      // exclude literals derived from template instantiations
+      not this.isFromTemplateInstantiation(_)
+    }
+  }
 
   /** Convenience for implementing class `UnrecognizedNumericLiteral` */
   abstract private class RecognizedNumericLiteral extends StandardLibrary::Literal { }

cpp/common/test/rules/unsignedintegerliteralsnotappropriatelysuffixed/UnsignedIntegerLiteralsNotAppropriatelySuffixed.expected

@@ -1,18 +1,18 @@
-| test.cpp:111:3:111:12 | 2147483648 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:116:3:116:20 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:139:3:139:21 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:162:3:162:21 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:185:3:185:22 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:208:3:208:22 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:227:3:227:14 | 2147483648 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:232:3:232:25 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:249:3:249:26 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:266:3:266:26 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:283:3:283:27 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:300:3:300:27 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:315:3:315:36 | 2147483648 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:322:3:322:68 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:365:3:365:69 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:412:3:412:69 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:457:3:457:70 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
-| test.cpp:502:3:502:70 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:126:3:126:12 | 2147483648 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:131:3:131:20 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:154:3:154:21 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:177:3:177:21 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:200:3:200:22 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:223:3:223:22 | 9223372036854775808 | Hex literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:242:3:242:14 | 2147483648 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:247:3:247:25 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:264:3:264:26 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:281:3:281:26 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:298:3:298:27 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:315:3:315:27 | 9223372036854775808 | Octal literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:330:3:330:36 | 2147483648 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:337:3:337:68 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:380:3:380:69 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:427:3:427:69 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:472:3:472:70 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |
+| test.cpp:517:3:517:70 | 9223372036854775808 | Binary literal is an unsigned integer but does not include a 'U' suffix. |

cpp/common/test/rules/unsignedintegerliteralsnotappropriatelysuffixed/test.cpp

@@ -105,6 +105,21 @@ void test_decimal_constants() {
                           // than max long long int
 }
 
+constexpr unsigned long long operator""_km(unsigned long long value) {
+  return value;
+}
+
+void test_user_defined_literal_exclusion() {
+  0x80000000_km; // COMPLIANT - user-defined literal argument should be excluded
+}
+
+template <typename T>
+unsigned long long instantiated_literal_exclusion() {
+  return 0x80000000; // COMPLIANT - template instantiation should be excluded
+}
+
+void test_instantiated_literal_exclusion() { instantiated_literal_exclusion<int>(); }
+
 void test_hexadecimal_constants() {
   0x0;        // COMPLIANT - uses signed int
   0x7FFFFFFF; // COMPLIANT - max value held by signed int