1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/jit/TypeData.h b/js/src/jit/TypeData.h
new file mode 100644
index 0000000000..4a05895e87
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+++ b/js/src/jit/TypeData.h
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+/* -*- 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_TypeData_h
+#define jit_TypeData_h
+
+#include "js/Value.h"
+
+namespace js {
+namespace jit {
+
+class TypeData {
+  JSValueType type_;
+
+ public:
+  TypeData() : type_(JSVAL_TYPE_UNKNOWN) {}
+  explicit TypeData(JSValueType type) : type_(type) {}
+
+  JSValueType type() const { return type_; }
+  bool hasData() const { return type_ != JSVAL_TYPE_UNKNOWN; }
+};
+
+class TypeDataList {
+  const static size_t MaxLength = 6;
+
+  uint8_t count_ = 0;
+  TypeData typeData_[MaxLength];
+
+ public:
+  TypeDataList() {}
+
+  uint8_t count() const { return count_; }
+
+  void addTypeData(TypeData data) {
+    MOZ_ASSERT(count_ < MaxLength);
+    MOZ_ASSERT(!typeData_[count_].hasData());
+    typeData_[count_++] = data;
+  }
+  TypeData get(uint32_t idx) const {
+    MOZ_ASSERT(idx < count_);
+    return typeData_[idx];
+  }
+
+  const TypeData* begin() const { return &typeData_[0]; }
+  const TypeData* end() const { return begin() + count_; }
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_TypeData_h */