Fixed #1642 (Tokenizer::simplifyKnownVariables: simplify after loop)

lib/tokenize.cpp

@@ -4949,16 +4949,35 @@ bool Tokenizer::simplifyKnownVariables()
 
                 const bool pointeralias(tok2->tokAt(2)->isName() || tok2->tokAt(2)->str() == "&");
 
-                std::string value(tok2->strAt(2));
+                std::string value;
+
+                Token *tok3 = NULL;
+
+                if (Token::Match(tok2->tokAt(-2), "for ( %varid% = %num% ; %varid% <|<= %num% ; ++| %varid% ++| ) {", varid))
+                {
+                    const std::string compareop = tok2->strAt(5);
+                    if (compareop == "<")
+                        value = tok2->strAt(6);
+                    else
+                        value = MathLib::toString(MathLib::toLongNumber(tok2->strAt(6)) + 1);
+
+                    // Skip for-body..
+                    tok3 = tok2->previous()->link()->next()->link()->next();
+                }
+                else
+                {
+                    value = tok2->strAt(2);
                     if (value == "]")
                         value = tok2->strAt(4);
                     else if (value == "&")
                         value = tok2->strAt(3);
-                Token* bailOutFromLoop = 0;
                     if (Token::simpleMatch(tok2->next(), "= &"))
                         tok2 = tok2->tokAt(3);
+                    tok3 = tok2->next();
+                }
+                Token* bailOutFromLoop = 0;
                 int indentlevel3 = indentlevel;     // indentlevel for tok3
-                for (Token *tok3 = tok2->next(); tok3; tok3 = tok3->next())
+                for (; tok3; tok3 = tok3->next())
                 {
                     if (tok3->str() == "{")
                     {

test/testtokenize.cpp

@@ -101,6 +101,7 @@ private:
         TEST_CASE(simplifyKnownVariables21);
         TEST_CASE(simplifyKnownVariables22);
         TEST_CASE(simplifyKnownVariables23);
+        TEST_CASE(simplifyKnownVariables24);
 
         TEST_CASE(match1);
 
@@ -1145,6 +1146,28 @@ private:
             simplifyKnownVariables(code));
     }
 
+    void simplifyKnownVariables24()
+    {
+        // This testcase is related to ticket #1596
+        const char code[] = "void foo()\n"
+                            "{\n"
+                            "    int c;\n"
+                            "    for (c=0;c<10;++c) { }\n"
+                            "    a[c] = 0;\n"
+                            "}\n";
+
+        // Current result
+        ASSERT_EQUALS(
+            "void foo ( ) "
+            "{"
+            " int c ;"
+            " for ( c = 0 ; c < 10 ; ++ c ) { }"
+            " a [ 10 ] = 0 ; "
+            "}",
+            simplifyKnownVariables(code));
+    }
+
+
     void match1()
     {
         // Match "%var% | %var%"