1 files changed, 41 insertions, 0 deletions
diff --git a/deps/v8/src/wasm/js-to-wasm-wrapper-cache.h b/deps/v8/src/wasm/js-to-wasm-wrapper-cache.h
new file mode 100644
index 0000000000..ff5fb8de72
--- /dev/null
+++ b/deps/v8/src/wasm/js-to-wasm-wrapper-cache.h
@@ -0,0 +1,41 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_WASM_JS_TO_WASM_WRAPPER_CACHE_H_
+#define V8_WASM_JS_TO_WASM_WRAPPER_CACHE_H_
+
+#include "src/compiler/wasm-compiler.h"
+#include "src/counters.h"
+#include "src/wasm/value-type.h"
+#include "src/wasm/wasm-code-manager.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+class JSToWasmWrapperCache {
+ public:
+  Handle<Code> GetOrCompileJSToWasmWrapper(Isolate* isolate, FunctionSig* sig,
+                                           bool is_import) {
+    std::pair<bool, FunctionSig> key(is_import, *sig);
+    Handle<Code>& cached = cache_[key];
+    if (cached.is_null()) {
+      cached = compiler::CompileJSToWasmWrapper(isolate, sig, is_import)
+                   .ToHandleChecked();
+    }
+    return cached;
+  }
+
+ private:
+  // We generate different code for calling imports than calling wasm functions
+  // in this module. Both are cached separately.
+  using CacheKey = std::pair<bool, FunctionSig>;
+  std::unordered_map<CacheKey, Handle<Code>, base::hash<CacheKey>> cache_;
+};
+
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_WASM_JS_TO_WASM_WRAPPER_CACHE_H_