1 files changed, 67 insertions, 0 deletions
diff --git a/deps/v8/src/wasm/wasm-features.h b/deps/v8/src/wasm/wasm-features.h
new file mode 100644
index 0000000000..2c6ab0f85a
--- /dev/null
+++ b/deps/v8/src/wasm/wasm-features.h
@@ -0,0 +1,67 @@
+// 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_WASM_FEATURES_H_
+#define V8_WASM_WASM_FEATURES_H_
+
+// The feature flags are declared in their own header.
+#include "src/base/macros.h"
+#include "src/wasm/wasm-feature-flags.h"
+
+// All features, including features that do not have flags.
+#define FOREACH_WASM_FEATURE FOREACH_WASM_FEATURE_FLAG
+
+namespace v8 {
+namespace internal {
+class Isolate;
+namespace wasm {
+
+#define COMMA ,
+#define SPACE
+#define DECL_FIELD(feat, desc, val) bool feat = false;
+#define JUST_TRUE(feat, desc, val) true
+#define JUST_FALSE(feat, desc, val) false
+#define DECL_PARAM(feat, desc, val) bool p##feat
+#define DO_INIT(feat, desc, val) feat(p##feat)
+
+// Enabled or detected features.
+struct WasmFeatures {
+  FOREACH_WASM_FEATURE(DECL_FIELD, SPACE)
+
+  constexpr WasmFeatures() = default;
+
+  explicit constexpr WasmFeatures(FOREACH_WASM_FEATURE(DECL_PARAM, COMMA))
+      : FOREACH_WASM_FEATURE(DO_INIT, COMMA) {}
+};
+
+static constexpr WasmFeatures kAllWasmFeatures{
+    FOREACH_WASM_FEATURE(JUST_TRUE, COMMA)};
+
+static constexpr WasmFeatures kNoWasmFeatures{
+    FOREACH_WASM_FEATURE(JUST_FALSE, COMMA)};
+
+#undef JUST_TRUE
+#undef JUST_FALSE
+#undef DECL_FIELD
+#undef DECL_PARAM
+#undef DO_INIT
+#undef COMMA
+#undef SPACE
+
+static constexpr WasmFeatures kAsmjsWasmFeatures = kNoWasmFeatures;
+
+V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromFlags();
+
+// Enables features based on both commandline flags and the isolate.
+// Precondition: A valid context must be set in {isolate->context()}.
+V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromIsolate(Isolate* isolate);
+
+V8_EXPORT_PRIVATE void UnionFeaturesInto(WasmFeatures* dst,
+                                         const WasmFeatures& src);
+
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_WASM_WASM_FEATURES_H_