misra: avoid false positives for true/false after #14607

Author: varshneydevansh

addons/misra.py

@@ -2460,27 +2460,38 @@ def get_category(essential_type):
                 if essential_type.split(' ')[0] in ('unsigned', 'signed'):
                     return essential_type.split(' ')[0]
             return None
+    
         for tok in cfg.tokenlist:
-            if tok.isAssignmentOp:
-                lhs = getEssentialType(tok.astOperand1)
-                rhs = getEssentialType(tok.astOperand2)
-                #print(lhs)
-                #print(rhs)
-                if lhs is None or rhs is None:
+            if not tok.isAssignmentOp:
+                continue
+    
+            lhs = getEssentialType(tok.astOperand1)
+            rhs = getEssentialType(tok.astOperand2)
+            if lhs is None or rhs is None:
+                continue
+    
+            find_std = cfg.standards.c if cfg.standards and cfg.standards.c else self.stdversion
+    
+            rhs_tok = tok.astOperand2
+            rhs_macro_name = rhs_tok.macroName if rhs_tok else None
+            rhs_spelling = rhs_macro_name if rhs_macro_name in ('true', 'false') else rhs_tok.str
+    
+            rhs_is_source_bool_literal = rhs_spelling in ('true', 'false')
+            rhs_is_source_int_literal_0_1 = rhs_spelling in ('0', '1')
+    
+            if lhs == 'bool':
+                if rhs_is_source_bool_literal:
                     continue
-                lhs_category = get_category(lhs)
-                rhs_category = get_category(rhs)
-                if lhs_category and rhs_category and lhs_category != rhs_category and rhs_category not in ('signed','unsigned'):
-                    self.reportError(tok, 10, 3)
-                find_std = cfg.standards.c if cfg.standards and cfg.standards.c else self.stdversion
-                allow_bool_literal_0_1 = (
-                    find_std == "c89" and
-                    lhs == "bool" and
-                    tok.astOperand2 and
-                    tok.astOperand2.str in ('0', '1')
-                )
-                if bitsOfEssentialType(lhs) < bitsOfEssentialType(rhs) and not allow_bool_literal_0_1:
-                    self.reportError(tok, 10, 3)
+                if find_std == 'c89' and rhs_is_source_int_literal_0_1:
+                    continue
+    
+            lhs_category = get_category(lhs)
+            rhs_category = get_category(rhs)
+            if lhs_category and rhs_category and lhs_category != rhs_category and rhs_category not in ('signed', 'unsigned'):
+                self.reportError(tok, 10, 3)
+    
+            if bitsOfEssentialType(lhs) < bitsOfEssentialType(rhs):
+                self.reportError(tok, 10, 3)
 
     def misra_10_4(self, data):
         op = {'+', '-', '*', '/', '%', '&', '|', '^', '+=', '-=', ':'}

addons/test/misra/misra-test-c11.c

@@ -29,6 +29,8 @@ static void misra_10_3_c11(void) {
     bool b = false;
     bool b0 = 0; // 10.3
     bool b1 = 1; // 10.3
+    bool bf = false; // no-warning
+    bool bt = true; // no-warning
     b = 0; // 10.3
     b = 1; // 10.3
     b = false; // no-warning