1 files changed, 34 insertions, 0 deletions
diff --git a/src/node/validation_cache_args.cpp b/src/node/validation_cache_args.cpp
new file mode 100644
index 0000000000..5ea0a8ca0a
--- /dev/null
+++ b/src/node/validation_cache_args.cpp
@@ -0,0 +1,34 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <node/validation_cache_args.h>
+
+#include <kernel/validation_cache_sizes.h>
+
+#include <util/system.h>
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <optional>
+
+using kernel::ValidationCacheSizes;
+
+namespace node {
+void ApplyArgsManOptions(const ArgsManager& argsman, ValidationCacheSizes& cache_sizes)
+{
+    if (auto max_size = argsman.GetIntArg("-maxsigcachesize")) {
+        // 1. When supplied with a max_size of 0, both InitSignatureCache and
+        //    InitScriptExecutionCache create the minimum possible cache (2
+        //    elements). Therefore, we can use 0 as a floor here.
+        // 2. Multiply first, divide after to avoid integer truncation.
+        size_t clamped_size_each = std::max<int64_t>(*max_size, 0) * (1 << 20) / 2;
+        cache_sizes = {
+            .signature_cache_bytes = clamped_size_each,
+            .script_execution_cache_bytes = clamped_size_each,
+        };
+    }
+}
+} // namespace node