lib: establish Zircon libc++ and KTL foundation

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/ktl/stub-new.cc b/lib/ktl/stub-new.cc
new file mode 100644
index 0000000..919d941
--- /dev/null
+++ b/lib/ktl/stub-new.cc
@@ -0,0 +1,25 @@
+// Copyright 2020 The Fuchsia Authors
+//
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT
+
+#include <new>
+
+// std::stable_sort (used as ktl::stable_sort) uses std::get_temporary_buffer,
+// which uses operator new to request a temporary buffer but then works fine
+// if it can't get one.  There is no "default" memory allocation in the
+// kernel, so just provide a stub operator new that always fails so
+// std::stable_sort falls back to its no-allocation algorithm.
+
+namespace std {
+
+const nothrow_t nothrow;
+
+}  // namespace std
+
+void* operator new(std::size_t, const std::nothrow_t&) noexcept { return nullptr; }
+
+void* operator new(std::size_t, std::align_val_t, const std::nothrow_t&) noexcept {
+  return nullptr;
+}