Implement missing amendment for directive 4-11 from misra C 2012 amendment 3

amendments.csv

@@ -1,7 +1,7 @@
 language,standard,amendment,rule_id,supportable,implementation_category,implemented,difficulty
 c,MISRA-C-2012,Amendment3,DIR-4-6,Yes,Expand,Yes,Easy
 c,MISRA-C-2012,Amendment3,DIR-4-9,Yes,Refine,Yes,Easy
-c,MISRA-C-2012,Amendment3,DIR-4-11,Yes,Refine,No,Import
+c,MISRA-C-2012,Amendment3,DIR-4-11,Yes,Refine,Yes,Import
 c,MISRA-C-2012,Amendment3,RULE-1-4,Yes,Replace,Yes,Easy
 c,MISRA-C-2012,Amendment3,RULE-10-1,Yes,Replace,Yes,Easy
 c,MISRA-C-2012,Amendment3,RULE-10-3,Yes,Refine,Yes,Easy

c/misra/src/rules/DIR-4-11/LowPrecisionPeriodicTrigonometricFunctionCall.ql

@@ -0,0 +1,43 @@
+/**
+ * @id c/misra/low-precision-periodic-trigonometric-function-call
+ * @name DIR-4-11: The validity of values passed to trigonometric functions shall be checked
+ * @description Trigonometric periodic functions have significantly less precision when called with
+ *              large floating-point values.
+ * @kind problem
+ * @precision high
+ * @problem.severity warning
+ * @tags external/misra/id/dir-4-11
+ *       correctness
+ *       external/misra/c/2012/third-edition-first-revision
+ *       external/misra/c/2012/amendment3
+ *       external/misra/obligation/required
+ */
+
+import cpp
+import codingstandards.c.misra
+import semmle.code.cpp.rangeanalysis.SimpleRangeAnalysis
+
+float getMaxAllowedAbsoluteValue(FloatingPointType t, string description) {
+  if t.getSize() <= 4
+  then (
+    // Per MISRA, assume k=1 for float types.
+    result = 3.15 and description = "pi"
+  ) else (
+    // Allow k=10 for doubles, as the standard allows for a larger range depending on the
+    // implementation, application, and precision goals.
+    result = 10 * 3.15 and description = "10 * pi"
+  )
+}
+
+from FunctionCall fc, Expr argument, float maxValue, float maxAllowedValue, string maxAllowedStr
+where
+  not isExcluded(fc, ContractsPackage::lowPrecisionPeriodicTrigonometricFunctionCallQuery()) and
+  fc.getTarget().getName() = ["sin", "cos", "tan"] and
+  argument = fc.getArgument(0) and
+  maxValue = rank[1](float bound | bound = [lowerBound(argument), upperBound(argument)].abs()) and
+  maxAllowedValue = getMaxAllowedAbsoluteValue(argument.getType(), maxAllowedStr) and
+  maxValue > maxAllowedValue
+select fc,
+  "Call to periodic trigonometric function " + fc.getTarget().getName() +
+    " with maximum argument absolute value of " + maxValue.toString() +
+    ", which exceeds the recommended " + "maximum of " + maxAllowedStr + "."

c/misra/test/rules/DIR-4-11/LowPrecisionPeriodicTrigonometricFunctionCall.expected

@@ -0,0 +1,18 @@
+| test.c:32:5:32:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:33:5:33:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:34:5:34:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:38:5:38:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:39:5:39:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:40:5:40:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 31.4, which exceeds the recommended maximum of pi. |
+| test.c:49:5:49:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:50:5:50:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:51:5:51:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:52:5:52:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |
+| test.c:53:5:53:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |
+| test.c:54:5:54:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |
+| test.c:55:5:55:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:56:5:56:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:57:5:57:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 314, which exceeds the recommended maximum of pi. |
+| test.c:58:5:58:7 | call to sin | Call to periodic trigonometric function sin with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |
+| test.c:59:5:59:7 | call to cos | Call to periodic trigonometric function cos with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |
+| test.c:60:5:60:7 | call to tan | Call to periodic trigonometric function tan with maximum argument absolute value of 314, which exceeds the recommended maximum of 10 * pi. |

c/misra/test/rules/DIR-4-11/LowPrecisionPeriodicTrigonometricFunctionCall.qlref

@@ -0,0 +1 @@
+rules/DIR-4-11/LowPrecisionPeriodicTrigonometricFunctionCall.ql

c/misra/test/rules/DIR-4-11/test.c

@@ -0,0 +1,62 @@
+#include <math.h>
+void f(int x) {
+  float f1 = 0.0f;
+  double d1 = 0.0f;
+  sin(f1); // COMPLIANT
+  cos(f1); // COMPLIANT
+  tan(f1); // COMPLIANT
+  sin(d1); // COMPLIANT
+  cos(d1); // COMPLIANT
+  tan(d1); // COMPLIANT
+
+  if (x < 10) {
+    f1 += 3.14;
+    d1 += 3.14;
+    sin(f1);  // COMPLIANT
+    cos(f1);  // COMPLIANT
+    tan(f1);  // COMPLIANT
+    sin(d1);  // COMPLIANT
+    cos(d1);  // COMPLIANT
+    tan(d1);  // COMPLIANT
+    sin(-f1); // COMPLIANT
+    cos(-f1); // COMPLIANT
+    tan(-f1); // COMPLIANT
+    sin(-d1); // COMPLIANT
+    cos(-d1); // COMPLIANT
+    tan(-d1); // COMPLIANT
+  }
+
+  if (x < 20) {
+    f1 = 3.14 * 10;
+    d1 = 3.14 * 10;
+    sin(f1);  // NON-COMPLIANT
+    cos(f1);  // NON-COMPLIANT
+    tan(f1);  // NON-COMPLIANT
+    sin(d1);  // COMPLIANT
+    cos(d1);  // COMPLIANT
+    tan(d1);  // COMPLIANT
+    sin(-f1); // NON-COMPLIANT
+    cos(-f1); // NON-COMPLIANT
+    tan(-f1); // NON-COMPLIANT
+    sin(-d1); // COMPLIANT
+    cos(-d1); // COMPLIANT
+    tan(-d1); // COMPLIANT
+  }
+
+  if (x < 30) {
+    f1 = 3.14 * 100;
+    d1 = 3.14 * 100;
+    sin(f1);  // NON-COMPLIANT
+    cos(f1);  // NON-COMPLIANT
+    tan(f1);  // NON-COMPLIANT
+    sin(d1);  // NON-COMPLIANT
+    cos(d1);  // NON-COMPLIANT
+    tan(d1);  // NON-COMPLIANT
+    sin(-f1); // NON-COMPLIANT
+    cos(-f1); // NON-COMPLIANT
+    tan(-f1); // NON-COMPLIANT
+    sin(-d1); // NON-COMPLIANT
+    cos(-d1); // NON-COMPLIANT
+    tan(-d1); // NON-COMPLIANT
+  }
+}

change_notes/2025-03-27-detect-precision-limit-in-trig-functions.md

@@ -0,0 +1,2 @@
+ - `DIR-4-11` - `LowPrecisionPeriodicTrigonometricFunctionCall.ql`:
+   - New query within rule added to detect calls to periodic trigonometric functions with values outside of pi*k for k that depends on implementation and application precision goals, assuming k=1 for 32 bit floating types and k=10 for 64 bit floating types.

cpp/common/src/codingstandards/cpp/exclusions/c/Contracts.qll

@@ -6,6 +6,7 @@ import codingstandards.cpp.exclusions.RuleMetadata
 newtype ContractsQuery =
   TDoNotViolateInLineLinkageConstraintsQuery() or
   TCheckMathLibraryFunctionParametersQuery() or
+  TLowPrecisionPeriodicTrigonometricFunctionCallQuery() or
   TFunctionErrorInformationUntestedQuery()
 
 predicate isContractsQueryMetadata(Query query, string queryId, string ruleId, string category) {
@@ -27,6 +28,15 @@ predicate isContractsQueryMetadata(Query query, string queryId, string ruleId, s
   ruleId = "DIR-4-11" and
   category = "required"
   or
+  query =
+    // `Query` instance for the `lowPrecisionPeriodicTrigonometricFunctionCall` query
+    ContractsPackage::lowPrecisionPeriodicTrigonometricFunctionCallQuery() and
+  queryId =
+    // `@id` for the `lowPrecisionPeriodicTrigonometricFunctionCall` query
+    "c/misra/low-precision-periodic-trigonometric-function-call" and
+  ruleId = "DIR-4-11" and
+  category = "required"
+  or
   query =
     // `Query` instance for the `functionErrorInformationUntested` query
     ContractsPackage::functionErrorInformationUntestedQuery() and
@@ -52,6 +62,13 @@ module ContractsPackage {
       TQueryC(TContractsPackageQuery(TCheckMathLibraryFunctionParametersQuery()))
   }
 
+  Query lowPrecisionPeriodicTrigonometricFunctionCallQuery() {
+    //autogenerate `Query` type
+    result =
+      // `Query` type for `lowPrecisionPeriodicTrigonometricFunctionCall` query
+      TQueryC(TContractsPackageQuery(TLowPrecisionPeriodicTrigonometricFunctionCallQuery()))
+  }
+
   Query functionErrorInformationUntestedQuery() {
     //autogenerate `Query` type
     result =

rule_packages/c/Contracts.json

@@ -44,6 +44,19 @@
           "implementation_scope": {
             "description": "This query identifies possible domain, pole and range errors on a selection of C standard library fuctions from math.h."
           }
+        },
+        {
+          "description": "Trigonometric periodic functions have significantly less precision when called with large floating-point values.",
+          "kind": "problem",
+          "name": "The validity of values passed to trigonometric functions shall be checked",
+          "precision": "high",
+          "severity": "warning",
+          "short_name": "LowPrecisionPeriodicTrigonometricFunctionCall",
+          "tags": [
+            "correctness",
+            "external/misra/c/2012/third-edition-first-revision",
+            "external/misra/c/2012/amendment3"
+          ]
         }
       ],
       "title": "The validity of values passed to library functions shall be checked"