small Preprocessor usage cleanups (#6066)

Makefile

@@ -553,7 +553,7 @@ $(libcppdir)/checkuninitvar.o: lib/checkuninitvar.cpp lib/addoninfo.h lib/astuti
 $(libcppdir)/checkunusedfunctions.o: lib/checkunusedfunctions.cpp externals/tinyxml2/tinyxml2.h lib/addoninfo.h lib/astutils.h lib/checkunusedfunctions.h lib/color.h lib/config.h lib/errorlogger.h lib/errortypes.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/smallvector.h lib/sourcelocation.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/vfvalue.h lib/xml.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $(libcppdir)/checkunusedfunctions.cpp
 
-$(libcppdir)/checkunusedvar.o: lib/checkunusedvar.cpp externals/simplecpp/simplecpp.h lib/addoninfo.h lib/astutils.h lib/check.h lib/checkunusedvar.h lib/config.h lib/errortypes.h lib/fwdanalysis.h lib/library.h lib/mathlib.h lib/platform.h lib/preprocessor.h lib/settings.h lib/smallvector.h lib/sourcelocation.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h lib/vfvalue.h
+$(libcppdir)/checkunusedvar.o: lib/checkunusedvar.cpp lib/addoninfo.h lib/astutils.h lib/check.h lib/checkunusedvar.h lib/config.h lib/errortypes.h lib/fwdanalysis.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/smallvector.h lib/sourcelocation.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/valueflow.h lib/vfvalue.h
 	$(CXX) ${INCLUDE_FOR_LIB} $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $(libcppdir)/checkunusedvar.cpp
 
 $(libcppdir)/checkvaarg.o: lib/checkvaarg.cpp lib/addoninfo.h lib/astutils.h lib/check.h lib/checkvaarg.h lib/config.h lib/errortypes.h lib/library.h lib/mathlib.h lib/platform.h lib/settings.h lib/smallvector.h lib/sourcelocation.h lib/standards.h lib/suppressions.h lib/symboldatabase.h lib/templatesimplifier.h lib/token.h lib/tokenize.h lib/tokenlist.h lib/utils.h lib/vfvalue.h

lib/checkunusedvar.cpp

@@ -24,7 +24,6 @@
 #include "errortypes.h"
 #include "fwdanalysis.h"
 #include "library.h"
-#include "preprocessor.h"
 #include "settings.h"
 #include "symboldatabase.h"
 #include "token.h"
@@ -1460,14 +1459,8 @@ void CheckUnusedVar::checkStructMemberUsage()
         // Packed struct => possibly used by lowlevel code. Struct members might be required by hardware.
         if (scope.bodyEnd->isAttributePacked())
             continue;
-        if (const Preprocessor *preprocessor = mTokenizer->getPreprocessor()) {
-            const auto& directives = preprocessor->getDirectives();
-            const bool isPacked = std::any_of(directives.cbegin(), directives.cend(), [&](const Directive& d) {
-                return d.linenr < scope.bodyStart->linenr() && d.str == "#pragma pack(1)" && d.file == mTokenizer->list.getFiles().front();
-            });
-            if (isPacked)
-                continue;
-        }
+        if (mTokenizer->isPacked(scope.bodyStart))
+            continue;
 
         // Bail out for template struct, members might be used in non-matching instantiations
         if (scope.className.find('<') != std::string::npos)

lib/preprocessor.h

@@ -73,6 +73,7 @@ class CPPCHECKLIB Preprocessor {
     // TODO: get rid of this
     friend class PreprocessorHelper;
     friend class TestPreprocessor;
+    friend class TestUnusedVar;
 
 public:
 
@@ -93,9 +94,6 @@ class CPPCHECKLIB Preprocessor {
     void inlineSuppressions(const simplecpp::TokenList &tokens, SuppressionList &suppressions);
 
     void setDirectives(const simplecpp::TokenList &tokens);
-    void setDirectives(const std::list<Directive> &directives) {
-        mDirectives = directives;
-    }
 
     /** list of all directives met while preprocessing file */
     const std::list<Directive> &getDirectives() const {
@@ -183,6 +181,10 @@ class CPPCHECKLIB Preprocessor {
 
     static bool hasErrors(const simplecpp::OutputList &outputList);
 
+    void setDirectives(const std::list<Directive> &directives) {
+        mDirectives = directives;
+    }
+
     const Settings& mSettings;
     ErrorLogger *mErrorLogger;
 

lib/tokenize.cpp

@@ -10589,3 +10589,14 @@ bool Tokenizer::hasIfdef(const Token *start, const Token *end) const
         d.file == list.getFiles()[start->fileIndex()];
     });
 }
+
+bool Tokenizer::isPacked(const Token * bodyStart) const
+{
+    assert(mPreprocessor);
+
+    const auto& directives = mPreprocessor->getDirectives();
+    // TODO: should this return true if the #pragma exists in any line before the start token?
+    return std::any_of(directives.cbegin(), directives.cend(), [&](const Directive& d) {
+        return d.linenr < bodyStart->linenr() && d.str == "#pragma pack(1)" && d.file == list.getFiles().front();
+    });
+}

lib/tokenize.h

@@ -24,7 +24,6 @@
 #include "config.h"
 #include "tokenlist.h"
 
-#include <cassert>
 #include <iosfwd>
 #include <list>
 #include <map>
@@ -367,13 +366,10 @@ class CPPCHECKLIB Tokenizer {
      */
     static const Token * isFunctionHead(const Token *tok, const std::string &endsWith);
 
-    const Preprocessor *getPreprocessor() const {
-        assert(mPreprocessor);
-        return mPreprocessor;
-    }
-
     bool hasIfdef(const Token *start, const Token *end) const;
 
+    bool isPacked(const Token * bodyStart) const;
+
 private:
 
     /** Simplify pointer to standard type (C only) */