fixup! fixup! fixup! fixup! fixup! fixup! fixup! fixup! Fix #11311 Do not search for null pointer in dead code

Author: francois-berder

lib/checknullpointer.cpp

@@ -346,7 +346,7 @@ const Token * CheckNullPointer::nullPointerByDeRefAndCheck(const Token *start, c
                         /* Garbage code */
                         return end;
                     }
-                    tok = tok->next()->linkAt(3); /* Skip condition */
+                    tok = tok->linkAt(4); /* Skip condition */
                     if (!tok || !tok->next() || !tok->next()->link()) {
                         /* Garbage code */
                         return end;
@@ -368,25 +368,21 @@ const Token * CheckNullPointer::nullPointerByDeRefAndCheck(const Token *start, c
                 }
                 const Token *condTok = ifTok->next()->astOperand2();
                 const Token *condStartTok = ifTok->next();
-                const Token *condEndTok = ifTok->next()->link();
+                const Token *condEndTok = condStartTok->link();
                 if (!Token::simpleMatch(condStartTok, "(") || !Token::simpleMatch(condEndTok, ")")) {
                     /* Garbage code */
                     return end;
                 }
                 tok = nullPointerByDeRefAndCheck(condStartTok, condEndTok, printInconclusive);
-                if (!tok || !tok->next() || !tok->next()->link()) {
+                if (!tok || !tok->next() || !tok->linkAt(1)) {
                     /* Garbage code */
                     return end;
                 }
 
                 prevBranchTaken = prevBranchTaken || (condTok->hasKnownIntValue() && condTok->getKnownIntValue());
                 if (condTok->hasKnownIntValue() && condTok->getKnownIntValue() == 0) {
-                    if (!tok->next()->link()) {
-                        /* Garbage code */
-                        return end;
-                    }
                     /* Skip body */
-                    tok = tok->next()->link();
+                    tok = tok->linkAt(1);
                 } else {
                     /* Analyze body */
                     const Token *elseIfBodyStartTok = tok->next();
@@ -401,16 +397,16 @@ const Token * CheckNullPointer::nullPointerByDeRefAndCheck(const Token *start, c
                     /* Garbage code */
                     return end;
                 }
-            } while (Token::simpleMatch(tok->next(), "else { if (") && Token::simpleMatch(tok->next()->linkAt(3), ") {"));
+            } while (Token::simpleMatch(tok->next(), "else { if (") && Token::simpleMatch(tok->linkAt(4), ") {"));
 
             /* Handle final else branch */
             if (prevBranchTaken && Token::simpleMatch(tok->next(), "else")) {
                 /* Skip body */
-                if (!tok->next() || !tok->next()->next() || !tok->next()->next()->link()) {
+                if (!tok->next() || !tok->next()->next() || !tok->linkAt(2)) {
                     /* Garbage code */
                     return end;
                 }
-                tok = tok->next()->next()->link();
+                tok = tok->linkAt(2);
             }
         } else if (Token::simpleMatch(tok, "?") && Token::simpleMatch(tok->astOperand2(), ":")) {  // ternary operator
             const Token *condTok = tok->astOperand1();
@@ -421,12 +417,12 @@ const Token * CheckNullPointer::nullPointerByDeRefAndCheck(const Token *start, c
             }
         } else {
             if (isUnevaluated(tok)) {
-                if (!tok->next() || !tok->next()->link()) {
+                if (!tok->next() || !tok->linkAt(1)) {
                     /* Garbage code */
                     return end;
                 }
 
-                tok = tok->next()->link();
+                tok = tok->linkAt(1);
             } else {
                 nullPointerByDeRefAndCheckToken(tok, printInconclusive);
             }