misra: Add support for expected suppressions in header files in `-verify` mode (#3252)

This commit allows to specify expected suppressions in the included
header files. This is necessary to verify MISRA checkers, which make
requirements for header files. For example, Rule 8.2 requires adding
prototypes for each function to the header files.

.travis.yml

@@ -74,6 +74,7 @@ matrix:
         # We'll force C89 standard to enable an additional verification for
         # rules 5.4 and 5.5 which have standard-dependent options.
         - ${CPPCHECK} --dump --suppress=uninitvar --suppress=uninitStructMember --std=c89 misra/misra-test.c
+        - ${CPPCHECK} --dump --suppress=uninitvar --suppress=uninitStructMember --std=c89 misra/misra-test.h
         - python3 ../misra.py -verify misra/misra-test.c.dump
         - ${CPPCHECK} --dump misra/misra-test.cpp
         - python3 ../misra.py -verify misra/misra-test.cpp.dump

addons/misra.py

@@ -2962,7 +2962,7 @@ class MisraChecker:
         ruleNum = num1 * 100 + num2
 
         if self.settings.verify:
-            self.verify_actual.append(str(location.linenr) + ':' + str(num1) + '.' + str(num2))
+            self.verify_actual.append('%s:%d %d.%d' % (location.file, location.linenr, num1, num2))
         elif self.isRuleSuppressed(location.file, location.linenr, ruleNum):
             # Error is suppressed. Ignore
             self.suppressionStats.setdefault(ruleNum, 0)
@@ -3126,6 +3126,14 @@ class MisraChecker:
             check_function(*args)
 
     def parseDump(self, dumpfile):
+        def fillVerifyExpected(verify_expected, tok):
+            """Add expected suppressions to verify_expected list."""
+            rule_re = re.compile(r'[0-9]+\.[0-9]+')
+            if tok.str.startswith('//') and 'TODO' not in tok.str:
+                for word in tok.str[2:].split(' '):
+                    if rule_re.match(word):
+                        verify_expected.append('%s:%d %s' % (tok.file, tok.linenr, word))
+
         data = cppcheckdata.parsedump(dumpfile)
 
         typeBits['CHAR'] = data.platform.char_bit
@@ -3136,12 +3144,23 @@ class MisraChecker:
         typeBits['POINTER'] = data.platform.pointer_bit
 
         if self.settings.verify:
+            # Add suppressions from the current file
             for tok in data.rawTokens:
-                if tok.str.startswith('//') and 'TODO' not in tok.str:
-                    compiled = re.compile(r'[0-9]+\.[0-9]+')
-                    for word in tok.str[2:].split(' '):
-                        if compiled.match(word):
-                            self.verify_expected.append(str(tok.linenr) + ':' + word)
+                fillVerifyExpected(self.verify_expected, tok)
+            # Add suppressions from the included headers
+            include_re = re.compile(r'^#include [<"]([a-zA-Z0-9]+[a-zA-Z\-_./\\0-9]*)[">]$')
+            dump_dir = os.path.dirname(data.filename)
+            for conf in data.configurations:
+                for directive in conf.directives:
+                    m = re.match(include_re, directive.str)
+                    if not m:
+                        continue
+                    header_dump_path = os.path.join(dump_dir, m.group(1) + '.dump')
+                    if not os.path.exists(header_dump_path):
+                        continue
+                    header_data = cppcheckdata.parsedump(header_dump_path)
+                    for tok in header_data.rawTokens:
+                        fillVerifyExpected(self.verify_expected, tok)
         else:
             self.printStatus('Checking ' + dumpfile + '...')
 

addons/test/misra/misra-test.c

@@ -1,4 +1,5 @@
 // To test:
+// ~/cppcheck/cppcheck --dump misra/misra-test.h --std=c89
 // ~/cppcheck/cppcheck --dump --suppress=uninitvar --suppress=uninitStructMember misra/misra-test.c --std=c89 && python3 ../misra.py -verify misra/misra-test.c.dump
 
 #include "path\file.h" // 20.2

addons/test/misra/misra-test.h

@@ -1,5 +1,6 @@
 #ifndef MISRA_TEST_H
 #define MISRA_TEST_H
 struct misra_h_s { int foo; };
-bool test(char *a);
+bool test(char *); // 8.2
+bool test(char *a); // OK
 #endif // MISRA_TEST_H