[libcxx-commits] [libcxx] Add C++23 stacktrace (P0881R7) (PR #136528)
Steve O'Brien via libcxx-commits
libcxx-commits at lists.llvm.org
Wed Jul 16 14:49:09 PDT 2025
================
@@ -0,0 +1,237 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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_STACKTRACE_BASIC
+#define _LIBCPP_STACKTRACE_BASIC
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+#if _LIBCPP_STD_VER >= 23
+
+# include <__functional/hash.h>
+# include <__fwd/format.h>
+# include <__iterator/iterator.h>
+# include <__iterator/reverse_iterator.h>
+# include <__memory/allocator_traits.h>
+# include <__memory_resource/polymorphic_allocator.h>
+# include <__type_traits/is_nothrow_constructible.h>
+# include <__vector/vector.h>
+# include <utility>
+
+# include <__stacktrace/base.h>
+# include <__stacktrace/entry.h>
+# include <__stacktrace/to_string.h>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// (19.6.4)
+// Class template basic_stacktrace [stacktrace.basic]
+
+class stacktrace_entry;
+
+template <class _Allocator>
+class _LIBCPP_EXPORTED_FROM_ABI basic_stacktrace : private __stacktrace::base {
+ friend struct hash<basic_stacktrace<_Allocator>>;
+ friend struct __stacktrace::__to_string;
+
+ using _ATraits _LIBCPP_NODEBUG = allocator_traits<_Allocator>;
+ constexpr static bool __kPropOnCopyAssign = _ATraits::propagate_on_container_copy_assignment::value;
+ constexpr static bool __kPropOnMoveAssign = _ATraits::propagate_on_container_move_assignment::value;
+ constexpr static bool __kPropOnSwap = _ATraits::propagate_on_container_swap::value;
+ constexpr static bool __kAlwaysEqual = _ATraits::is_always_equal::value;
+ constexpr static bool __kNoThrowDflConstruct = is_nothrow_default_constructible_v<_Allocator>;
+ constexpr static bool __kNoThrowAlloc =
+ noexcept(noexcept(_Allocator().allocate(1)) && noexcept(_Allocator().allocate_at_least(1)));
+
+ [[no_unique_address]]
+ _Allocator __alloc_;
+
+ using __entry_vec _LIBCPP_NODEBUG = vector<stacktrace_entry, _Allocator>;
+ __entry_vec __entries_;
+
+public:
+ // (19.6.4.1)
+ // Overview [stacktrace.basic.overview]
+
+ using value_type = stacktrace_entry;
+ using const_reference = const value_type&;
+ using reference = value_type&;
+ using difference_type = ptrdiff_t;
+ using size_type = size_t;
+ using allocator_type = _Allocator;
+ using const_iterator = __entry_vec::const_iterator;
+ using iterator = const_iterator;
+
+ using reverse_iterator = std::reverse_iterator<basic_stacktrace::iterator>;
+ using const_reverse_iterator = std::reverse_iterator<basic_stacktrace::const_iterator>;
+
+ // (19.6.4.2)
+ // Creation and assignment [stacktrace.basic.cons]
+
+ _LIBCPP_NO_TAIL_CALLS _LIBCPP_NOINLINE _LIBCPP_EXPORTED_FROM_ABI static basic_stacktrace
+ current(const allocator_type& __caller_alloc = allocator_type()) noexcept(__kNoThrowAlloc) {
+ return current(1, /* no __max_depth */ ~0, __caller_alloc);
+ }
+
+ _LIBCPP_NO_TAIL_CALLS _LIBCPP_NOINLINE _LIBCPP_EXPORTED_FROM_ABI static basic_stacktrace
+ current(size_type __skip, const allocator_type& __caller_alloc = allocator_type()) noexcept(__kNoThrowAlloc) {
+ return current(__skip + 1, /* no __max_depth */ ~0, __caller_alloc);
+ }
+
+ _LIBCPP_NO_TAIL_CALLS _LIBCPP_NOINLINE _LIBCPP_EXPORTED_FROM_ABI static basic_stacktrace
+ current(size_type __skip,
+ size_type __max_depth,
+ const allocator_type& __caller_alloc = allocator_type()) noexcept(__kNoThrowAlloc) {
+ __stacktrace::base __builder(__caller_alloc);
----------------
elsteveogrande wrote:
Actually I'm realizing I set the default max_depth to `~0`, i.e. max unsigned value, which is sure to trigger that assertion :) Will fix that
https://github.com/llvm/llvm-project/pull/136528
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