1 files changed, 82 insertions, 0 deletions
diff --git a/js/src/jit/riscv64/constant/util-riscv64.h b/js/src/jit/riscv64/constant/util-riscv64.h
new file mode 100644
index 0000000000..089e0f3b94
--- /dev/null
+++ b/js/src/jit/riscv64/constant/util-riscv64.h
@@ -0,0 +1,82 @@
+
+// Copyright 2022 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 jit_riscv64_constant_util_riscv64__h_
+#define jit_riscv64_constant_util_riscv64__h_
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+namespace js {
+namespace jit {
+template <typename T>
+class V8Vector {
+ public:
+  V8Vector() : start_(nullptr), length_(0) {}
+  V8Vector(T* data, int length) : start_(data), length_(length) {
+    MOZ_ASSERT(length == 0 || (length > 0 && data != nullptr));
+  }
+
+  // Returns the length of the vector.
+  int length() const { return length_; }
+
+  // Returns the pointer to the start of the data in the vector.
+  T* start() const { return start_; }
+
+  // Access individual vector elements - checks bounds in debug mode.
+  T& operator[](int index) const {
+    MOZ_ASSERT(0 <= index && index < length_);
+    return start_[index];
+  }
+
+  inline V8Vector<T> operator+(int offset) {
+    MOZ_ASSERT(offset < length_);
+    return V8Vector<T>(start_ + offset, length_ - offset);
+  }
+
+ private:
+  T* start_;
+  int length_;
+};
+
+template <typename T, int kSize>
+class EmbeddedVector : public V8Vector<T> {
+ public:
+  EmbeddedVector() : V8Vector<T>(buffer_, kSize) {}
+
+  explicit EmbeddedVector(T initial_value) : V8Vector<T>(buffer_, kSize) {
+    for (int i = 0; i < kSize; ++i) {
+      buffer_[i] = initial_value;
+    }
+  }
+
+  // When copying, make underlying Vector to reference our buffer.
+  EmbeddedVector(const EmbeddedVector& rhs) : V8Vector<T>(rhs) {
+    MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    this->set_start(buffer_);
+  }
+
+  EmbeddedVector& operator=(const EmbeddedVector& rhs) {
+    if (this == &rhs) return *this;
+    V8Vector<T>::operator=(rhs);
+    MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+    this->set_start(buffer_);
+    return *this;
+  }
+
+ private:
+  T buffer_[kSize];
+};
+
+// Helper function for printing to a Vector.
+static inline int MOZ_FORMAT_PRINTF(2, 3)
+    SNPrintF(V8Vector<char> str, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = vsnprintf(str.start(), str.length(), format, args);
+  va_end(args);
+  return result;
+}
+}  // namespace jit
+}  // namespace js
+#endif