Fixed #4291 (Variable ID is not set when variable is accessed through 'this')

lib/checkother.cpp

@@ -1034,7 +1034,7 @@ void CheckOther::checkSelfAssignment()
     const char selfAssignmentPattern[] = "%var% = %var% ;|=|)";
     const Token *tok = Token::findmatch(_tokenizer->tokens(), selfAssignmentPattern);
     while (tok) {
-        if (Token::Match(tok->previous(), "[;{}]") &&
+        if (Token::Match(tok->previous(), "[;{}.]") &&
             tok->varId() && tok->varId() == tok->tokAt(2)->varId() &&
             isTypeWithoutSideEffects(_tokenizer, symbolDatabase->getVariableFromVarId(tok->varId()))) {
             bool err = true;

lib/tokenize.cpp

@@ -2624,7 +2624,7 @@ static void setVarIdClassFunction(Token * const startToken,
                                   unsigned int *_varId)
 {
     for (Token *tok2 = startToken; tok2 && tok2 != endToken; tok2 = tok2->next()) {
-        if (tok2->varId() == 0 && tok2->previous()->str() != ".") {
+        if (tok2->varId() == 0) {
             const std::map<std::string,unsigned int>::const_iterator it = varlist.find(tok2->str());
             if (it != varlist.end()) {
                 tok2->varId(it->second);

test/testother.cpp

@@ -2791,6 +2791,16 @@ private:
               "    i = i;\n"
               "}");
         ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'i' to itself.\n", errout.str());
+
+        // #4291 - id for variables accessed through 'this'
+        check("class Foo {\n"
+              "    int var;\n"
+              "    void func();\n"
+              "};\n"
+              "void Foo::func() {\n"
+              "    this->var = var;\n"
+              "}");
+        ASSERT_EQUALS("[test.cpp:6]: (warning) Redundant assignment of 'var' to itself.\n", errout.str());
     }
 
     void trac1132() {

test/testtokenize.cpp

@@ -250,6 +250,7 @@ private:
         TEST_CASE(varid_in_class6);     // #3755
         TEST_CASE(varid_in_class7);     // set variable id for struct members
         TEST_CASE(varid_in_class8);     // unknown macro in class
+        TEST_CASE(varid_in_class9);     // #4291 - id for variables accessed through 'this'
         TEST_CASE(varid_initList);
         TEST_CASE(varid_operator);
         TEST_CASE(varid_throw);
@@ -3889,6 +3890,27 @@ private:
                       tokenizeDebugListing(code));
     }
 
+    void varid_in_class9() {  // #4291 - id for variables accessed through 'this'
+        const char code[] = "class A {\n"
+                            "  int var;\n"
+                            "public:\n"
+                            "  void setVar();\n"
+                            "};\n"
+                            "void A::setVar() {\n"
+                            "  this->var = var;\n"
+                            "}";
+        ASSERT_EQUALS("\n\n##file 0\n"
+                      "1: class A {\n"
+                      "2: int var@1 ;\n"
+                      "3: public:\n"
+                      "4: void setVar ( ) ;\n"
+                      "5: } ;\n"
+                      "6: void A :: setVar ( ) {\n"
+                      "7: this . var@1 = var@1 ;\n"
+                      "8: }\n",
+                      tokenizeDebugListing(code));
+    }
+
     void varid_initList() {
         const char code[] = "class A {\n"
                             "  A() : x(0) {}\n"