[libc++] Make `<map>` `std::map` constexpr as part of P3372R3 #134330

vinay-deshmukh · 2025-04-04T00:41:50Z

Summary:

Apply _LIBCPP_CONSTEXPR_SINCE_CXX26 to map, __tree and node-handle
map.modifiers/try.emplace.pass.cpp : Start using the previously unused mv3. (Should this be a separate patch?)
Has a TODO for multimap
a. libcxx/test/std/containers/associative/map/map.ops/contains.pass.cpp
b. libcxx/test/std/containers/associative/map/map.ops/contains_transparent.pass.cpp
TODO: for multimap and others:
a. libcxx/test/std/containers/container.node/node_handle.pass.cpp
Fix typo in libcxx/include/__memory/pointer_traits.h
pair<const MoveOnly, ...>
a. move_assign.pass.cpp
b. move_alloc.pass.cpp
c. Fails to compile if static_assert(test()); is called in the test file
d. Has a // FIXME with commented code
Based on this comment, I tried replacing:
a. __node_traits::construct(__na, std::addressof(__h->__value_), std::forward<_Args>(__args)...);
b. with
c. std::__construct_at(std::addressof(__h->__value_), std::forward<_Args>(__args)...);
d. Fails with:

  # .---command stderr------------
  # | t.tmp.exe: /home/runner/_work/llvm-project/llvm-project/libcxx/test/support/container_test_types.h:399: CopyInsertable<1>::CopyInsertable(const CopyInsertable<Dummy> &) [Dummy = 1]: Assertion `getConstructController()->isInAllocatorConstruct()' failed.
  # `-----------------------------
  # error: command failed with exit status: 250

github-actions · 2025-04-04T00:43:27Z

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github-actions · 2025-04-04T00:44:15Z

✅ With the latest revision this PR passed the C/C++ code formatter.

…ant expression

…ect of unique_ptr

…use the pointed object type 'std::__tree_node<std::__value_type<int, double>, min_pointer<void>>' is not similar to the target type 'std::__tree_node_base<min_pointer<void>>'

…use the pointed object type 'std::__tree_node<std::__value_type<int, double>, min_pointer<void>>' is not similar to the target type 'std::__tree_node_base<min_pointer<void>>

frederick-vs-ja · 2025-08-11T02:15:06Z

libcxx/include/__tree

 __tree<_Tp, _Compare, _Allocator>::__construct_node(_Args&&... __args) {
  __node_allocator& __na = __node_alloc();
  __node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));
+
+  #if _LIBCPP_STD_VER >= 26


I think we should use something like

std::__construct_at(std::addressof(__h), __na, std::forward<_Args>(__args)...)

in all modes.

And use __node_traits::construct in the constructor of __node.

Thanks!

It works if I don't give the __na argument, as there is no allocator arg here:

llvm-project/libcxx/include/__memory/construct_at.h

Line 44 in 5165a6c

_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp* __construct_at(_Tp* __location, _Args&&... __args) {

Q:

Should this line:

llvm-project/libcxx/include/__tree

Line 1768 in 5165a6c

__node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));

actually be

__node_holder __h(__node_traits::allocate(__na, sizeof(typename __node_holder::element_type)), _Dp(__na));

?

If not, how does it work?

Update:

Allocates n * sizeof(T) bytes of uninitialized storage by calling - https://en.cppreference.com/w/cpp/memory/allocator/allocate.html

And use __node_traits::construct in the constructor of __node.

not sure I understand where this is supposed to be as:

https://github.com/llvm/llvm-project/blob/ea14834966ad666856246f24de46397cbfc932eb/libcxx/include/__tree#L754C34-L754C45

is the definition of __node

And use __node_traits::construct in the constructor of __node.

not sure I understand where this is supposed to be as:

https://github.com/llvm/llvm-project/blob/ea14834966ad666856246f24de46397cbfc932eb/libcxx/include/__tree#L754C34-L754C45

is the definition of __node

Hmm... __node is actually __tree_node, so we should modify that class. It seems necessary to wrap the __value_ member into a union.

Hmm... __node is actually __tree_node, so we should modify that class. It seems necessary to wrap the _value member into a union.

I think I might be missing something,

Modify the class in what manner? I have added a constructor that was previously missing to __tree_node so I can construct it during constant evaluation.

It seems necessary to wrap the _value member into a union.

What would be the reason to do this?

Something like:

class __tree_node { union { ... __value_; ??? // what would be this part? } };

What would be the reason to do this?

We need to use allocator's construct function (if any) to construct the element.

// what would be this part?

I think nothing else should be added to the union. We just need to call __node_traits::construct(__a, std::addressof(__value_), __na, std::forward<_Args>(__args)...) in the constructor.

I think I understand
Let me try this tomorrow.

In all modes

Should this be submitted as a separate patch then? If we're also changing the existing runtime code path

In all modes

Should this be submitted as a separate patch then? If we're also changing the existing runtime code path

I think so. But I overlooked C++03 mode before. Perhaps need to do different things (or keep old strategy?) in C++03 mode as some uses of union might be ill-formed.

…P3372-constexpr-map

…d.`Revert "PR review comment" This reverts commit 4fbb472. Fails with: ``` # .---command stderr------------ # | t.tmp.exe: /home/runner/_work/llvm-project/llvm-project/libcxx/test/support/container_test_types.h:399: CopyInsertable<1>::CopyInsertable(const CopyInsertable<Dummy> &) [Dummy = 1]: Assertion `getConstructController()->isInAllocatorConstruct()' failed. # `----------------------------- # error: command failed with exit status: 250 ```

vinay-deshmukh · 2025-08-12T02:37:12Z

Not sure what this failure is in gcc-15 tests:

 # .---command stderr------------
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp: In function ‘int main(int, char**)’:
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:83:27: error: non-constant condition for static assertion
  # |    83 |   static_assert(test_upper());
  # |       |                 ~~~~~~~~~~^~
  # | In file included from /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/map:599,
  # |                  from /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:16:
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:83:27:   in ‘constexpr’ expansion of ‘test_upper()’
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:70:27:   in ‘constexpr’ expansion of ‘test<std::__1::map<int, int> >()’
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:50:11:   in ‘constexpr’ expansion of ‘test0<std::__1::map<int, int>, test<std::__1::map<int, int> >()::<lambda(auto:32)> >(Init{((const int*)(& const int [1]{1})), 1}, (is1, test<std::__1::map<int, int> >()::<lambda(auto:32)>()), Init{0, 0}, 1)’
  # | /home/runner/_work/llvm-project/llvm-project/libcxx/test/std/containers/associative/map/map.erasure/erase_if.pass.cpp:35:3:   in ‘constexpr’ expansion of ‘std::__1::erase_if<int, int, less<int>, allocator<pair<const int, int> >, test<std::__1::map<int, int> >()::<lambda(auto:32)> >(s, (p, test<std::__1::map<int, int> >()::<lambda(auto:32)>()))’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/map:1605:42:   in ‘constexpr’ expansion of ‘std::__1::__libcpp_erase_if_container<map<int, int>, test<std::__1::map<int, int> >()::<lambda(auto:32)> >((* & __c), __pred)’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__iterator/erase_if_container.h:32:25:   in ‘constexpr’ expansion of ‘(& __c)->std::__1::map<int, int>::erase(__iter)’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/map:1256:106:   in ‘constexpr’ expansion of ‘((std::__1::map<int, int>*)this)->std::__1::map<int, int>::__tree_.std::__1::__tree<std::__1::__value_type<int, int>, std::__1::__map_value_compare<int, std::__1::pair<const int, int>, std::__1::less<int>, true>, std::__1::allocator<std::__1::pair<const int, int> > >::erase(std::__1::__tree_const_iterator<std::__1::__value_type<int, int>, std::__1::__tree_node<std::__1::__value_type<int, int>, void*>*, long int>(__p.std::__1::__map_iterator<std::__1::__tree_iterator<std::__1::__value_type<int, int>, std::__1::__tree_node<std::__1::__value_type<int, int>, void*>*, long int> >::__i_))’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__tree:2132:49:   in ‘constexpr’ expansion of ‘((std::__1::__tree<std::__1::__value_type<int, int>, std::__1::__map_value_compare<int, std::__1::pair<const int, int>, std::__1::less<int>, true>, std::__1::allocator<std::__1::pair<const int, int> > >*)this)->std::__1::__tree<std::__1::__value_type<int, int>, std::__1::__map_value_compare<int, std::__1::pair<const int, int>, std::__1::less<int>, true>, std::__1::allocator<std::__1::pair<const int, int> > >::__remove_node_pointer(__np)’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__tree:1997:3:   in ‘constexpr’ expansion of ‘__r.std::__1::__tree_iterator<std::__1::__value_type<int, int>, std::__1::__tree_node<std::__1::__value_type<int, int>, void*>*, long int>::operator++()’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__tree:644:55:   in ‘constexpr’ expansion of ‘std::__1::__tree_next_iter<__tree_end_node<__tree_node_base<void*>*>*, __tree_node_base<void*>*>(std::__1::__static_fancy_pointer_cast<__tree_node_base<void*>*, __tree_end_node<__tree_node_base<void*>*>*>(((std::__1::__tree_iterator<std::__1::__value_type<int, int>, std::__1::__tree_node<std::__1::__value_type<int, int>, void*>*, long int>*)this)->std::__1::__tree_iterator<std::__1::__value_type<int, int>, std::__1::__tree_node<std::__1::__value_type<int, int>, void*>*, long int>::__ptr_))’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__tree:178:36:   in ‘constexpr’ expansion of ‘std::__1::__tree_is_left_child<__tree_node_base<void*>*>(__x)’
  # | /home/runner/_work/llvm-project/llvm-project/build/generic-gcc/libcxx/test-suite-install/include/c++/v1/__tree:90:33: error: ‘‘result_decl’ not supported by dump_expr<expression error>’ is not a constant expression
  # |    90 |   return __x == __x->__parent_->__left_;
  # |       |                 ~~~~~~~~~~~~~~~~^~~~~~~
  # | At global scope:
  # | cc1plus: note: unrecognized command-line option ‘-Wno-nullability-completeness’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-pass-failed’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-local-type-template-args’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-unused-local-typedef’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-user-defined-literals’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-reserved-module-identifier’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-atomic-alignment’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-aligned-allocation-unavailable’ may have been intended to silence earlier diagnostics
  # | cc1plus: note: unrecognized command-line option ‘-Wno-unused-command-line-argument’ may have been intended to silence earlier diagnostics
  # `-----------------------------
  # error: command failed with exit status: 1

AIX 32 fails with the following and basically the whole test suite(not sure if it has the up to date compiler)

AIX is using Clang 19, so about a year old and that may be the cause of this failure:


# .---command stderr------------
--
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/libcxx/test/std/containers/associative/map/compare.pass.cpp:59:17: error: static assertion expression is not an integral constant expression
  | # \|    59 \|   static_assert(test());
  | # \|       \|                 ^~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/build/aix/libcxx/test-suite-install/include/c++/v1/__memory/construct_at.h:38:49: note: non-literal type 'std::__tree_node<std::__value_type<Key, int>, void *>' cannot be used in a constant expression
  | # \|    38 \|   return ::new (static_cast<void*>(__location)) _Tp(std::forward<_Args>(__args)...);
  | # \|       \|                                                 ^
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/build/aix/libcxx/test-suite-install/include/c++/v1/__memory/construct_at.h:46:10: note: in call to 'construct_at<std::__tree_node<std::__value_type<Key, int>, void *>, const std::piecewise_construct_t &, std::tuple<Key &&>, std::tuple<>, std::__tree_node<std::__value_type<Key, int>, void *> *>(&{*new std::__tree_node<std::__value_type<Key, int>, void *>[1]#0}[0], piecewise_construct, std::forward_as_tuple(std::move(__k)), std::forward_as_tuple())'
  | # \|    46 \|   return std::construct_at(__location, std::forward<_Args>(__args)...);
  | # \|       \|          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/build/aix/libcxx/test-suite-install/include/c++/v1/__tree:1893:5: note: in call to '__construct_at<std::__tree_node<std::__value_type<Key, int>, void *>, const std::piecewise_construct_t &, std::tuple<Key &&>, std::tuple<>, std::__tree_node<std::__value_type<Key, int>, void *> *>(&{*new std::__tree_node<std::__value_type<Key, int>, void *>[1]#0}[0], piecewise_construct, std::forward_as_tuple(std::move(__k)), std::forward_as_tuple())'
  | # \|  1893 \|     std::__construct_at(std::addressof(*__h), std::forward<_Args>(__args)...);
  | # \|       \|     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/build/aix/libcxx/test-suite-install/include/c++/v1/__tree:1856:25: note: in call to 'this->__construct_node<const std::piecewise_construct_t &, std::tuple<Key &&>, std::tuple<>>(piecewise_construct, std::forward_as_tuple(std::move(__k)), std::forward_as_tuple())'
  | # \|  1856 \|     __node_holder __h = __construct_node(std::forward<_Args>(__args)...);
  | # \|       \|                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/build/aix/libcxx/test-suite-install/include/c++/v1/map:1492:10: note: in call to 'this->__tree_.__emplace_unique_key_args<Key, const std::piecewise_construct_t &, std::tuple<Key &&>, std::tuple<>>(Key(0), piecewise_construct, std::forward_as_tuple(std::move(__k)), std::forward_as_tuple())'
  | # \|  1492 \|   return __tree_
  | # \|       \|          ^~~~~~~
  | # \|  1493 \|       .__emplace_unique_key_args(
  | # \|       \|       ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | # \|  1494 \|           __k, std::piecewise_construct, std::forward_as_tuple(std::move(__k)), std::forward_as_tuple())
  | # \|       \|           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/libcxx/test/std/containers/associative/map/compare.pass.cpp:37:5: note: in call to 'm_contains.operator[](Key(0))'
  | # \|    37 \|     m_contains[Key(0)] = 42;
  | # \|       \|     ^~~~~~~~~~~~~~~~~~
  | # \| /scratch/powerllvm/cpap8006/llvm-project/libcxx-ci/libcxx/test/std/containers/associative/map/compare.pass.cpp:59:17: note: in call to 'test()'
  | # \|    59 \|   static_assert(test());
  | # \|       \|                 ^~~~~~
  | # \| 1 error generated.
  | # `-----------------------------
  | # error: command failed with exit status: 1
  |  
  | --

vinay-deshmukh added 2 commits April 3, 2025 20:52

Apply initial _LIBCPP_CONSTEXPR_SINCE_CXX26

83583bb

Add feature test macro

6560dd5

vinay-deshmukh force-pushed the vinay-issue-128660-P3372-constexpr-map branch from 181a08d to 6560dd5 Compare April 4, 2025 00:53

vinay-deshmukh added 11 commits April 3, 2025 21:20

one test to start with

ce1a62f

start seeing constexpr failures for at.pass.cpp

a72b619

member call on object outside its lifetime is not allowed in a const…

c04441e

…ant expression

Move past member call on object past it's lifetime

ec9317e

Add ctor to initialize __value_type and __tree_node_base, and the obj…

cec33fb

…ect of unique_ptr

construction works, at() fails due to throw_out_of_range

0574be6

can't intentionally throw in constexpr

ed995a2

note: cast from 'void *' is not allowed in a constant expression beca…

e941811

…use the pointed object type 'std::__tree_node<std::__value_type<int, double>, min_pointer<void>>' is not similar to the target type 'std::__tree_node_base<min_pointer<void>>'

note: cast from 'void *' is not allowed in a constant expression beca…

def8261

…use the pointed object type 'std::__tree_node<std::__value_type<int, double>, min_pointer<void>>' is not similar to the target type 'std::__tree_node_base<min_pointer<void>>

ignore min_allocator tests for now

76fcef6

at.pass.cpp works in cpp26 for some reason

9ea718f

vinay-deshmukh force-pushed the vinay-issue-128660-P3372-constexpr-map branch from 46d0bb9 to 9ea718f Compare April 7, 2025 22:25

vinay-deshmukh added 13 commits April 7, 2025 18:47

empty.verify.cpp passes

a38112b

index_key_.pass.cpp constexpr fixed, but other failure

b9d17a9

index_rv_key.pass.cpp constexpr fixed, but other failure

7cbc6c8

fix index_tuple.pass.cpp

e8b0649

fix: iterator.pass.cpp

5c51105

fix max_size.pass.cpp

ed34a53

size.pass.cpp

1d3b9ef

alloc.pass.cpp

e124b63

blocked on assign_initializer_list

938989c

compare.pass.cpp

7d73d59

Modify all tests to have TEST_CONSTEXPR_CXX26 and without

30ec57c

passing at: copy_assign.addressof.compile.pass.cpp

21c442c

failing at copy_assign.pass.cpp only in constexpr

1e86d9c

vinay-deshmukh added 3 commits August 10, 2025 20:25

Fix for move_assign

c4a3034

almost a fix for move_assign.pass.cpp

77a9d5d

insert_range_maps_sets.h, needs a lot of constexpr depth

27604a5

frederick-vs-ja reviewed Aug 11, 2025

View reviewed changes

vinay-deshmukh added 3 commits August 11, 2025 07:13

add why sfinae

d8d6278

insert_and_emplace_allocator_requirements.pass.cpp passes

187b86f

Merge remote-tracking branch 'upstream/main' into vinay-issue-128660-…

b3deeb1

…P3372-constexpr-map

vinay-deshmukh changed the title ~~[libc++] Make map constexpr as part of P3372R3~~ [libc++] Make <map> std::map constexpr as part of P3372R3 Aug 11, 2025

vinay-deshmukh added 10 commits August 11, 2025 18:47

use the typedef

2143eb5

remove concepts, collapse unnecessary sfinae

209f88d

some docs

a7235cb

breaks correctly

ee0a6b5

still correct failures with cleanup

c8e907f

more cleans

bfea79f

more clean

03a6a4a

PR review comment

4fbb472

include __memory/construct_at

b3e9926

vinay-deshmukh force-pushed the vinay-issue-128660-P3372-constexpr-map branch from 990228b to efd9f96 Compare August 12, 2025 01:25

vinay-deshmukh added 4 commits August 11, 2025 21:54

one clean

ae13527

cleanup for libcxx/test/support/container_test_types.h

ebfc34d

clean back

4133867

clang-format

78fc8ca

adjust constexpr steps arg

0aa760e

vinay-deshmukh marked this pull request as ready for review August 12, 2025 02:39

vinay-deshmukh requested a review from a team as a code owner August 12, 2025 02:39

vinay-deshmukh added 3 commits August 11, 2025 22:42

clean

2edf9ac

Redundant check

7760d51

Add ReleaseNotes

06e38db

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