1 files changed, 64 insertions, 0 deletions
diff --git a/js/src/jit/ABIFunctionType.h b/js/src/jit/ABIFunctionType.h
new file mode 100644
index 0000000000..fe54aaf4a1
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+++ b/js/src/jit/ABIFunctionType.h
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_ABIFunctionType_h
+#define jit_ABIFunctionType_h
+
+#include <initializer_list>
+#include <stdint.h>
+
+#include "jit/ABIFunctionTypeGenerated.h"
+
+namespace js {
+namespace jit {
+
+enum class ABIType {
+  // A pointer sized integer
+  General = 0x1,
+  // A 32-bit integer
+  Int32 = 0x2,
+  // A 64-bit integer
+  Int64 = 0x3,
+  // A 32-bit floating point number
+  Float32 = 0x4,
+  // A 64-bit floating point number
+  Float64 = 0x5
+};
+
+const size_t ABITypeArgShift = 0x3;
+const size_t ABITypeArgMask = (1 << ABITypeArgShift) - 1;
+
+namespace detail {
+
+static constexpr uint64_t MakeABIFunctionType(
+    ABIType ret, std::initializer_list<ABIType> args) {
+  uint64_t abiType = 0;
+  for (auto arg : args) {
+    abiType <<= ABITypeArgShift;
+    abiType |= (uint64_t)arg;
+  }
+  abiType <<= ABITypeArgShift;
+  abiType |= (uint64_t)ret;
+  return abiType;
+}
+
+}  // namespace detail
+
+enum ABIFunctionType : uint64_t {
+  // The enum must be explicitly typed to avoid UB: some validly constructed
+  // members are larger than any explicitly declared members.
+  ABI_FUNCTION_TYPE_ENUM
+};
+
+static constexpr ABIFunctionType MakeABIFunctionType(
+    ABIType ret, std::initializer_list<ABIType> args) {
+  return ABIFunctionType(detail::MakeABIFunctionType(ret, args));
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_ABIFunctionType_h */