From 3ad39e9878310e5317ee73c9b353c1e2c1c5c4ee Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sat, 11 Jul 2026 22:48:30 +0800
Subject: lib: establish Zircon libc++ and KTL foundation

---
 third_party/libcxx/include/c++/v1/__cstddef/byte.h | 85 ++++++++++++++++++++++
 .../libcxx/include/c++/v1/__cstddef/max_align_t.h  | 27 +++++++
 .../libcxx/include/c++/v1/__cstddef/nullptr_t.h    | 24 ++++++
 .../libcxx/include/c++/v1/__cstddef/ptrdiff_t.h    | 24 ++++++
 .../libcxx/include/c++/v1/__cstddef/size_t.h       | 24 ++++++
 5 files changed, 184 insertions(+)
 create mode 100644 third_party/libcxx/include/c++/v1/__cstddef/byte.h
 create mode 100644 third_party/libcxx/include/c++/v1/__cstddef/max_align_t.h
 create mode 100644 third_party/libcxx/include/c++/v1/__cstddef/nullptr_t.h
 create mode 100644 third_party/libcxx/include/c++/v1/__cstddef/ptrdiff_t.h
 create mode 100644 third_party/libcxx/include/c++/v1/__cstddef/size_t.h

(limited to 'third_party/libcxx/include/c++/v1/__cstddef')

diff --git a/third_party/libcxx/include/c++/v1/__cstddef/byte.h b/third_party/libcxx/include/c++/v1/__cstddef/byte.h
new file mode 100644
index 0000000..3d97db1
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/__cstddef/byte.h
@@ -0,0 +1,85 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CSTDDEF_BYTE_H
+#define _LIBCPP___CSTDDEF_BYTE_H
+
+#include <__config>
+#include <__fwd/byte.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_integral.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 17
+_LIBCPP_BEGIN_UNVERSIONED_NAMESPACE_STD
+
+enum class byte : unsigned char {};
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator|(byte __lhs, byte __rhs) noexcept {
+  return static_cast<byte>(
+      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs)));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept {
+  return __lhs = __lhs | __rhs;
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator&(byte __lhs, byte __rhs) noexcept {
+  return static_cast<byte>(
+      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs)));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept {
+  return __lhs = __lhs & __rhs;
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator^(byte __lhs, byte __rhs) noexcept {
+  return static_cast<byte>(
+      static_cast<unsigned char>(static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs)));
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept {
+  return __lhs = __lhs ^ __rhs;
+}
+
+_LIBCPP_HIDE_FROM_ABI inline constexpr byte operator~(byte __b) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(~static_cast<unsigned int>(__b)));
+}
+
+template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI constexpr byte& operator<<=(byte& __lhs, _Integer __shift) noexcept {
+  return __lhs = __lhs << __shift;
+}
+
+template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI constexpr byte operator<<(byte __lhs, _Integer __shift) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift));
+}
+
+template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI constexpr byte& operator>>=(byte& __lhs, _Integer __shift) noexcept {
+  return __lhs = __lhs >> __shift;
+}
+
+template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
+_LIBCPP_HIDE_FROM_ABI constexpr byte operator>>(byte __lhs, _Integer __shift) noexcept {
+  return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift));
+}
+
+template <class _Integer, __enable_if_t<is_integral<_Integer>::value, int> = 0>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Integer to_integer(byte __b) noexcept {
+  return static_cast<_Integer>(__b);
+}
+
+_LIBCPP_END_UNVERSIONED_NAMESPACE_STD
+#endif // _LIBCPP_STD_VER >= 17
+
+#endif // _LIBCPP___CSTDDEF_BYTE_H
diff --git a/third_party/libcxx/include/c++/v1/__cstddef/max_align_t.h b/third_party/libcxx/include/c++/v1/__cstddef/max_align_t.h
new file mode 100644
index 0000000..7c09c7e
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/__cstddef/max_align_t.h
@@ -0,0 +1,27 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CSTDDEF_MAX_ALIGN_T_H
+#define _LIBCPP___CSTDDEF_MAX_ALIGN_T_H
+
+#include <__config>
+#include <stddef.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if !defined(_LIBCPP_CXX03_LANG)
+using ::max_align_t _LIBCPP_USING_IF_EXISTS;
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CSTDDEF_MAX_ALIGN_T_H
diff --git a/third_party/libcxx/include/c++/v1/__cstddef/nullptr_t.h b/third_party/libcxx/include/c++/v1/__cstddef/nullptr_t.h
new file mode 100644
index 0000000..7eaae01
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/__cstddef/nullptr_t.h
@@ -0,0 +1,24 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CSTDDEF_NULLPTR_T_H
+#define _LIBCPP___CSTDDEF_NULLPTR_T_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+using nullptr_t = decltype(nullptr);
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CSTDDEF_NULLPTR_T_H
diff --git a/third_party/libcxx/include/c++/v1/__cstddef/ptrdiff_t.h b/third_party/libcxx/include/c++/v1/__cstddef/ptrdiff_t.h
new file mode 100644
index 0000000..146f345
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/__cstddef/ptrdiff_t.h
@@ -0,0 +1,24 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CSTDDEF_PTRDIFF_T_H
+#define _LIBCPP___CSTDDEF_PTRDIFF_T_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+using ptrdiff_t = decltype(static_cast<int*>(nullptr) - static_cast<int*>(nullptr));
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CSTDDEF_PTRDIFF_T_H
diff --git a/third_party/libcxx/include/c++/v1/__cstddef/size_t.h b/third_party/libcxx/include/c++/v1/__cstddef/size_t.h
new file mode 100644
index 0000000..59bad93
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/__cstddef/size_t.h
@@ -0,0 +1,24 @@
+//===---------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CSTDDEF_SIZE_T_H
+#define _LIBCPP___CSTDDEF_SIZE_T_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+using size_t = decltype(sizeof(int));
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CSTDDEF_SIZE_T_H
-- 
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