Merge bitcoin#20211: Use -Wswitch for TxoutType where possible

fa650ca Use -Wswitch for TxoutType where possible (MarcoFalke)
fa59e0b test: Add missing script_standard_Solver_success cases (MarcoFalke)

Pull request description:

  This removes unused `default:` cases for all `switch` statements on `TxoutType` and adds the cases (`MULTISIG`, `NULL_DATA`, `NONSTANDARD`) to `ExtractDestination` for clarity.

  Also, the compiler is now able to use `-Wswitch`.

ACKs for top commit:
  practicalswift:
    cr ACK fa650ca: patch looks correct and `assert(false);` is better than UB :)
  hebasto:
    ACK fa650ca, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 282458b6523bd8923a0c0f5c423d1db2dce2a2d1b1d1dae455415c6fc995bb41ce82c1f9b0a1c0dcc6d874d171e04c30eca585f147582f52c7048c140358630a

src/script/sign.cpp

@@ -99,8 +99,7 @@ static bool SignStep(const SigningProvider& provider, const BaseSignatureCreator
     std::vector<valtype> vSolutions;
     whichTypeRet = Solver(scriptPubKey, vSolutions);
 
-    switch (whichTypeRet)
-    {
+    switch (whichTypeRet) {
     case TxoutType::NONSTANDARD:
     case TxoutType::NULL_DATA:
         return false;
@@ -151,10 +150,8 @@ static bool SignStep(const SigningProvider& provider, const BaseSignatureCreator
         }
         return ok;
     }
-
-    default:
-        return false;
-    }
+    } // no default case, so the compiler can warn about missing cases
+    assert(false);
 }
 
 static CScript PushAll(const std::vector<valtype>& values)

src/script/standard.cpp

@@ -29,8 +29,7 @@ CKeyID ToKeyID(const PKHash& key_hash)
 
 const char* GetTxnOutputType(TxoutType t)
 {
-    switch (t)
-    {
+    switch (t) {
     case TxoutType::NONSTANDARD: return "nonstandard";
     case TxoutType::PUBKEY: return "pubkey";
     case TxoutType::PUBKEYHASH: return "pubkeyhash";
@@ -138,26 +137,30 @@ bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
     std::vector<valtype> vSolutions;
     TxoutType whichType = Solver(scriptPubKey, vSolutions);
 
-    if (whichType == TxoutType::PUBKEY) {
+    switch (whichType) {
+    case TxoutType::PUBKEY: {
         CPubKey pubKey(vSolutions[0]);
         if (!pubKey.IsValid())
             return false;
 
         addressRet = PKHash(pubKey);
         return true;
     }
-    else if (whichType == TxoutType::PUBKEYHASH)
-    {
+    case TxoutType::PUBKEYHASH: {
         addressRet = PKHash(uint160(vSolutions[0]));
         return true;
     }
-    else if (whichType == TxoutType::SCRIPTHASH)
-    {
+    case TxoutType::SCRIPTHASH: {
         addressRet = ScriptHash(uint160(vSolutions[0]));
         return true;
     }
-    // Multisig txns have more than one address...
-    return false;
+    case TxoutType::MULTISIG:
+        // Multisig txns have more than one address...
+    case TxoutType::NULL_DATA:
+    case TxoutType::NONSTANDARD:
+        return false;
+    } // no default case, so the compiler can warn about missing cases
+    assert(false);
 }
 
 bool ExtractDestinations(const CScript& scriptPubKey, TxoutType& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet)

src/wallet/rpcdump.cpp

@@ -1109,9 +1109,9 @@ static std::string RecurseImportData(const CScript& script, ImportData& import_d
     case TxoutType::NULL_DATA:
         return "unspendable script";
     case TxoutType::NONSTANDARD:
-    default:
         return "unrecognized script";
-    }
+    } // no default case, so the compiler can warn about missing cases
+    CHECK_NONFATAL(false);
 }
 
 static UniValue ProcessImportLegacy(ImportData& import_data, std::map<CKeyID, CPubKey>& pubkey_map, std::map<CKeyID, CKey>& privkey_map, std::set<CScript>& script_pub_keys, bool& have_solving_data, const UniValue& data, std::vector<CKeyID>& ordered_pubkeys)

src/wallet/scriptpubkeyman.cpp

@@ -90,8 +90,7 @@ IsMineResult IsMineInner(const LegacyScriptPubKeyMan& keystore, const CScript& s
     TxoutType whichType = Solver(scriptPubKey, vSolutions);
 
     CKeyID keyID;
-    switch (whichType)
-    {
+    switch (whichType) {
     case TxoutType::NONSTANDARD:
     case TxoutType::NULL_DATA:
         break;
@@ -154,7 +153,7 @@ IsMineResult IsMineInner(const LegacyScriptPubKeyMan& keystore, const CScript& s
         }
         break;
     }
-    }
+    } // no default case, so the compiler can warn about missing cases
 
     if (ret == IsMineResult::NO && keystore.HaveWatchOnly(scriptPubKey)) {
         ret = std::max(ret, IsMineResult::WATCH_ONLY);