Merge #20575: Do not run functions with necessary side-effects in assert()

5021810650 Make CanFlushToDisk a const member function (practicalswift)
281cf99554 Do not run functions with necessary side-effects in assert() (practicalswift)

Pull request description:

  Do not run functions with necessary side-effects in `assert()`.

ACKs for top commit:
  laanwj:
    Code review ACK 5021810650
  sipa:
    utACK 5021810650
  theStack:
    Code Review ACK 5021810650 🟢

Tree-SHA512: 38b7faccc2f16a499f9b7b1b962b49eb58580b2a2bbf63ea49dcc418a5ecc8f21a0972fa953f66db9509c7239af67cfa2f9266423fd220963d091034d7332b96

src/bench/chacha_poly_aead.cpp

@@ -31,12 +31,15 @@ static void CHACHA20_POLY1305_AEAD(benchmark::Bench& bench, size_t buffersize, b
     uint32_t len = 0;
     bench.batch(buffersize).unit("byte").run([&] {
         // encrypt or decrypt the buffer with a static key
-        assert(aead.Crypt(seqnr_payload, seqnr_aad, aad_pos, out.data(), out.size(), in.data(), buffersize, true));
+        const bool crypt_ok_1 = aead.Crypt(seqnr_payload, seqnr_aad, aad_pos, out.data(), out.size(), in.data(), buffersize, true);
+        assert(crypt_ok_1);
 
         if (include_decryption) {
             // if we decrypt, include the GetLength
-            assert(aead.GetLength(&len, seqnr_aad, aad_pos, in.data()));
-            assert(aead.Crypt(seqnr_payload, seqnr_aad, aad_pos, out.data(), out.size(), in.data(), buffersize, true));
+            const bool get_length_ok = aead.GetLength(&len, seqnr_aad, aad_pos, in.data());
+            assert(get_length_ok);
+            const bool crypt_ok_2 = aead.Crypt(seqnr_payload, seqnr_aad, aad_pos, out.data(), out.size(), in.data(), buffersize, true);
+            assert(crypt_ok_2);
         }
 
         // increase main sequence number

src/validation.h

@@ -562,7 +562,7 @@ public:
 
     //! @returns whether or not the CoinsViews object has been fully initialized and we can
     //!          safely flush this object to disk.
-    bool CanFlushToDisk() EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
+    bool CanFlushToDisk() const EXCLUSIVE_LOCKS_REQUIRED(cs_main) {
         return m_coins_views && m_coins_views->m_cacheview;
     }
 

src/wallet/test/coinselector_tests.cpp

@@ -64,7 +64,8 @@ static void add_coin(CWallet& wallet, const CAmount& nValue, int nAge = 6*24, bo
     if (spendable) {
         CTxDestination dest;
         std::string error;
-        assert(wallet.GetNewDestination(OutputType::BECH32, "", dest, error));
+        const bool destination_ok = wallet.GetNewDestination(OutputType::BECH32, "", dest, error);
+        assert(destination_ok);
         tx.vout[nInput].scriptPubKey = GetScriptForDestination(dest);
     }
     if (fIsFromMe) {