Merge #15921: validation: Tidy up ValidationState interface

3004d5a12d09d94bfc4dee2a8e8f2291996a4aaf [validation] Remove fMissingInputs from AcceptToMemoryPool() (John Newbery)
c428622a5bb1e37b2e6ab2c52791ac05d9271238 [validation] Remove unused first_invalid parameter from ProcessNewBlockHeaders() (John Newbery)
7204c6434b944f6ad51b3c895837729d3aa56eea [validation] Remove useless ret parameter from Invalid() (John Newbery)
1a37de4b3174d19a6d8691ae07e92b32fdfaef11 [validation] Remove error() calls from Invalid() calls (John Newbery)
067981e49246822421a7bcc720491427e1dba8a3 [validation] Tidy Up ValidationResult class (John Newbery)
a27a2957ed9afbe5a96caa5f0f4cbec730d27460 [validation] Add CValidationState subclasses (John Newbery)

Pull request description:

  Carries out some remaining tidy-ups remaining after PR 15141:

  - split ValidationState into TxValidationState and BlockValidationState (commit from ajtowns)
  - various minor code style tidy-ups to the ValidationState class
  - remove the useless `ret` parameter from `ValidationState::Invalid()`
  - remove the now unused `first_invalid` parameter from `ProcessNewBlockHeaders()`
  - remove the `fMissingInputs` parameter from `AcceptToMemoryPool()`, and deal with missing inputs the same way as other errors by using the `TxValidationState` object.

  Tip for reviewers (thanks ryanofsky!): The first commit ("[validation] Add CValidationState subclasses" ) is huge and can be easier to start reviewing if you revert the rote, mechanical changes:

  Substitute the commit hash of commit "[validation] Add CValidationState subclasses" for <CommitHash> in the commands below.

  ```sh
  git checkout <CommitHash>
  git grep -l ValidationState | xargs sed -i 's/BlockValidationState\|TxValidationState/CValidationState/g'
  git grep -l ValidationResult | xargs sed -i 's/BlockValidationResult\|TxValidationResult/ValidationInvalidReason/g'
  git grep -l MaybePunish | xargs sed -i 's/MaybePunishNode\(ForBlock\|ForTx\)/MaybePunishNode/g'
  git diff HEAD^
  ```

  After that it's possible to easily see the mechanical changes with:

  ```sh
  git log -p -n1 -U0 --word-diff-regex=. <CommitHash>
  ```

ACKs for top commit:
  laanwj:
    ACK 3004d5a12d09d94bfc4dee2a8e8f2291996a4aaf
  amitiuttarwar:
    code review ACK 3004d5a12d09d94bfc4dee2a8e8f2291996a4aaf. Also built & ran tests locally.
  fjahr:
    Code review ACK 3004d5a12d09d94bfc4dee2a8e8f2291996a4aaf . Only nit style change and pure virtual destructor added since my last review.
  ryanofsky:
    Code review ACK 3004d5a12d09d94bfc4dee2a8e8f2291996a4aaf. Just whitespace change and pure virtual destructor added since last review.

Tree-SHA512: 511de1fb380a18bec1944ea82b513b6192df632ee08bb16344a2df3c40811a88f3872f04df24bc93a41643c96c48f376a04551840fd804a961490d6c702c3d36

3 files changed, 4 insertions, 4 deletions

diff --git a/src/bench/block_assemble.cpp b/src/bench/block_assemble.cpp
index 157f936a95..2f47398d99 100644
--- a/src/bench/block_assemble.cpp
+++ b/src/bench/block_assemble.cpp
@@ -38,8 +38,8 @@ static void AssembleBlock(benchmark::State& state)
         LOCK(::cs_main); // Required for ::AcceptToMemoryPool.
 
         for (const auto& txr : txs) {
-            CValidationState state;
-            bool ret{::AcceptToMemoryPool(::mempool, state, txr, nullptr /* pfMissingInputs */, nullptr /* plTxnReplaced */, false /* bypass_limits */, /* nAbsurdFee */ 0)};
+            TxValidationState state;
+            bool ret{::AcceptToMemoryPool(::mempool, state, txr, nullptr /* plTxnReplaced */, false /* bypass_limits */, /* nAbsurdFee */ 0)};
             assert(ret);
         }
     }
diff --git a/src/bench/checkblock.cpp b/src/bench/checkblock.cpp
index 4b13381e16..edf43bd4dc 100644
--- a/src/bench/checkblock.cpp
+++ b/src/bench/checkblock.cpp
@@ -42,7 +42,7 @@ static void DeserializeAndCheckBlockTest(benchmark::State& state)
         bool rewound = stream.Rewind(benchmark::data::block413567.size());
         assert(rewound);
 
-        CValidationState validationState;
+        BlockValidationState validationState;
         bool checked = CheckBlock(block, validationState, chainParams->GetConsensus());
         assert(checked);
     }
diff --git a/src/bench/duplicate_inputs.cpp b/src/bench/duplicate_inputs.cpp
index 6cfa3750d6..a783370b4e 100644
--- a/src/bench/duplicate_inputs.cpp
+++ b/src/bench/duplicate_inputs.cpp
@@ -54,7 +54,7 @@ static void DuplicateInputs(benchmark::State& state)
     block.hashMerkleRoot = BlockMerkleRoot(block);
 
     while (state.KeepRunning()) {
-        CValidationState cvstate{};
+        BlockValidationState cvstate{};
         assert(!CheckBlock(block, cvstate, chainparams.GetConsensus(), false, false));
         assert(cvstate.GetRejectReason() == "bad-txns-inputs-duplicate");
     }