Fixed ticket #346 (adding a "const" token prevents detection of memory leak)

http://sourceforge.net/apps/trac/cppcheck/ticket/346

src/checkmemoryleak.cpp

@@ -1544,11 +1544,17 @@ void CheckMemoryLeakInFunction::check()
             if (sz < 1)
                 sz = 1;
 
-            if (Token::Match(tok, "[{};] %type% * %var% [;=]"))
+            if (Token::Match(tok, "[{};] %type% * const| %var% [;=]"))
-                checkScope(tok->next(), tok->strAt(3), classmember, sz);
+            {
+                const int varname_tok = (tok->tokAt(3)->str() != "const" ? 3 : 4);
+                checkScope(tok->next(), tok->strAt(varname_tok), classmember, sz);
+            }
 
-            else if (Token::Match(tok, "[{};] %type% %type% * %var% [;=]"))
+            else if (Token::Match(tok, "[{};] %type% %type% * const| %var% [;=]"))
-                checkScope(tok->next(), tok->strAt(4), classmember, sz);
+            {
+                const int varname_tok = (tok->tokAt(4)->str() != "const" ? 4 : 5);
+                checkScope(tok->next(), tok->strAt(varname_tok), classmember, sz);
+            }
         }
     }
 }

src/tokenize.cpp

@@ -2165,6 +2165,18 @@ bool Tokenizer::simplifyVarDecl()
                 tok2 = NULL;
         }
 
+        else if (Token::Match(tok2, "%type% * const %var% ,|="))
+        {
+            if (tok2->tokAt(3)->str() != "operator")
+            {
+                tok2 = tok2->tokAt(4);    // The ',' token
+            }
+            else
+            {
+                tok2 = NULL;
+            }
+        }
+
         else if (Token::Match(tok2, "%type% %var% [ %num% ] ,"))
         {
             tok2 = tok2->tokAt(5);    // The ',' token
@@ -2215,7 +2227,7 @@ bool Tokenizer::simplifyVarDecl()
                     {
                         // "type var ="   =>   "type var; var ="
                         Token *VarTok = type0->tokAt(typelen);
-                        if (VarTok->str()[0] == '*')
+                        while (Token::Match(VarTok, "*|const"))
                             VarTok = VarTok->next();
                         InsertTokens(eq, VarTok, 2);
                         eq->str(";");

test/testmemleak.cpp

@@ -227,6 +227,15 @@ private:
               "    int *a = new int[10];\n"
               "}\n");
         ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: a\n", errout.str());
+
+        // ticket #346
+        check("void f()\n"
+              "{\n"
+              "    int * const a = new int[10];\n"
+              "    const int * const b = new int[10];\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: a\n[test.cpp:5]: (error) Memory leak: b\n",
+                      errout.str());
     }
 
     void simple2()

test/testtokenize.cpp

@@ -144,6 +144,7 @@ private:
         TEST_CASE(vardecl1);
         TEST_CASE(vardecl2);
         TEST_CASE(vardecl3);
+        TEST_CASE(vardecl4);
         TEST_CASE(volatile_variables);
         TEST_CASE(syntax_error);
 
@@ -2043,6 +2044,27 @@ private:
         ASSERT_EQUALS("void f ( ) { char * p ; p = foo < 10 , char > ( ) ; }", actual);
     }
 
+    void vardecl4()
+    {
+        // ticket #346
+
+        const char code1[] = "void *p = NULL;";
+        const char res1[]  = "void * p ; p = NULL ;";
+        ASSERT_EQUALS(res1, tokenizeAndStringify(code1));
+
+        const char code2[] = "const void *p = NULL;";
+        const char res2[]  = "const void * p ; p = NULL ;";
+        ASSERT_EQUALS(res2, tokenizeAndStringify(code2));
+
+        const char code3[] = "void * const p = NULL;";
+        const char res3[]  = "void * const p ; p = NULL ;";
+        ASSERT_EQUALS(res3, tokenizeAndStringify(code3));
+
+        const char code4[] = "const void * const p = NULL;";
+        const char res4[]  = "const void * const p ; p = NULL ;";
+        ASSERT_EQUALS(res4, tokenizeAndStringify(code4));
+    }
+
     void volatile_variables()
     {
         const char code[] = "volatile int a=0;\n"