[libcxx-commits] [libcxx] 127c390 - [libc++] Rewrite the IWYU generation (#78295)

[via libcxx-commits]

Author: Louis Dionne
Date: 2024-01-16T13:45:05-05:00
New Revision: 127c390fc413f8f267b085b153e6d21f84c7886e

URL: https://github.com/llvm/llvm-project/commit/127c390fc413f8f267b085b153e6d21f84c7886e
DIFF: https://github.com/llvm/llvm-project/commit/127c390fc413f8f267b085b153e6d21f84c7886e.diff

LOG: [libc++] Rewrite the IWYU generation (#78295)

This simplifies the IWYU generation script by treating everything as a
file, instead of dealing with directories and files separately.

This has the downside that the `libcxx.imp` file is a lot larger than it
used to be, however we now have the flexibility of mapping files under
detail directories to different public headers. For example, this allows
us to map <__fwd/subrange.h> to <ranges> but <__fwd/pair.h> to
<utility>.

This patch also adds basic validation to ensure that we never map a
header to a public header that doesn't exist. We may still be missing
some mappings or we may be mapping to incorrect headers, but we won't be
mapping to headers that downright don't exist.

Fixes #63346

Added: 
    

Modified: 
    libcxx/include/libcxx.imp
    libcxx/utils/generate_iwyu_mapping.py
    libcxx/utils/libcxx/header_information.py

Removed: 
    


################################################################################
diff  --git a/libcxx/include/libcxx.imp b/libcxx/include/libcxx.imp
index 3eb2aa84931482..8616f9639f4d90 100644
--- a/libcxx/include/libcxx.imp
+++ b/libcxx/include/libcxx.imp
@@ -1,53 +1,838 @@
 [
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-  { include: [ "<__hash_table>", "private", "<unordered_set>", "public" ] },
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-  { include: [ "<__node_handle>", "private", "<map>", "public" ] },
-  { include: [ "<__node_handle>", "private", "<set>", "public" ] },
-  { include: [ "<__node_handle>", "private", "<unordered_map>", "public" ] },
-  { include: [ "<__node_handle>", "private", "<unordered_set>", "public" ] },
-  { include: [ "<__split_buffer>", "private", "<deque>", "public" ] },
-  { include: [ "<__split_buffer>", "private", "<vector>", "public" ] },
-  { include: [ "<__threading_support>", "private", "<atomic>", "public" ] },
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-  { include: [ "<__threading_support>", "private", "<semaphore>", "public" ] },
-  { include: [ "<__threading_support>", "private", "<thread>", "public" ] },
-  { include: [ "<__tree>", "private", "<map>", "public" ] },
-  { include: [ "<__tree>", "private", "<set>", "public" ] },
-  { include: [ "@<__algorithm/.*>", "private", "<algorithm>", "public" ] },
-  { include: [ "@<__atomic/.*>", "private", "<atomic>", "public" ] },
-  { include: [ "@<__bit/.*>", "private", "<bit>", "public" ] },
-  { include: [ "@<__charconv/.*>", "private", "<charconv>", "public" ] },
-  { include: [ "@<__chrono/.*>", "private", "<chrono>", "public" ] },
-  { include: [ "@<__compare/.*>", "private", "<compare>", "public" ] },
-  { include: [ "@<__concepts/.*>", "private", "<concepts>", "public" ] },
-  { include: [ "@<__condition_variable/.*>", "private", "<condition_variable>", "public" ] },
-  { include: [ "@<__coroutine/.*>", "private", "<coroutine>", "public" ] },
-  { include: [ "@<__debug_utils/.*>", "private", "<debug_utils>", "public" ] },
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-  { include: [ "@<__expected/.*>", "private", "<expected>", "public" ] },
-  { include: [ "@<__filesystem/.*>", "private", "<filesystem>", "public" ] },
-  { include: [ "@<__format/.*>", "private", "<format>", "public" ] },
-  { include: [ "@<__functional/.*>", "private", "<functional>", "public" ] },
-  { include: [ "@<__fwd/.*>", "private", "<fwd>", "public" ] },
-  { include: [ "@<__ios/.*>", "private", "<ios>", "public" ] },
-  { include: [ "@<__iterator/.*>", "private", "<iterator>", "public" ] },
-  { include: [ "@<__locale_dir/.*>", "private", "<locale>", "public" ] },
-  { include: [ "@<__math/.*>", "private", "<math>", "public" ] },
-  { include: [ "@<__mdspan/.*>", "private", "<mdspan>", "public" ] },
-  { include: [ "@<__memory/.*>", "private", "<memory>", "public" ] },
-  { include: [ "@<__memory_resource/.*>", "private", "<memory_resource>", "public" ] },
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-  { include: [ "@<__utility/.*>", "private", "<utility>", "public" ] },
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+  { include: [ "<__algorithm/any_of.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/binary_search.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/comp.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/comp_ref_type.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/copy.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/copy_if.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/copy_move_common.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/prev_permutation.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/pstl_backends/cpu_backends/fill.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_copy.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/ranges_copy_backward.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_equal.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_fill_n.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_for_each_n.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_remove_if.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/ranges_replace.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_sample.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_set_
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+  { include: [ "<__algorithm/ranges_set_union.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_sort.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__algorithm/ranges_unique.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/ranges_unique_copy.h>", "private", "<algorithm>", "public" ] },
+  { include: [ "<__algorithm/ranges_upper_bound.h>", "private", "<algorithm>", "public" ] },
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+  { include: [ "<__type_traits/is_enum.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_equality_comparable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_execution_policy.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_final.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_floating_point.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_function.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_fundamental.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_implicitly_default_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_integral.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_literal_type.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_member_function_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_member_object_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_member_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_move_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_move_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_convertible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_copy_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_copy_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_default_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_destructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_move_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_nothrow_move_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_null_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_object.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_pod.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_polymorphic.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_primary_template.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_reference.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_reference_wrapper.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_referenceable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_same.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_scalar.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_scoped_enum.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_signed.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_signed_integer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_specialization.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_standard_layout.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_swappable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivial.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_copy_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_copy_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_copyable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_default_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_destructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_lexicographically_comparable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_move_assignable.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_trivially_move_constructible.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_unbounded_array.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_union.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_unsigned.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_unsigned_integer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_valid_expansion.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_void.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/is_volatile.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/lazy.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/make_32_64_or_128_bit.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/make_const_lvalue_ref.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/make_signed.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/make_unsigned.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/maybe_const.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/nat.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/negation.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/noexcept_move_assign_container.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/operation_traits.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/promote.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/rank.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_all_extents.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_const.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_const_ref.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_cv.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_cvref.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_extent.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_pointer.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_reference.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/remove_volatile.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/result_of.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/strip_signature.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/type_identity.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/type_list.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/underlying_type.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/unwrap_ref.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__type_traits/void_t.h>", "private", "<type_traits>", "public" ] },
+  { include: [ "<__utility/as_const.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/as_lvalue.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/auto_cast.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/cmp.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/convert_to_integral.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/declval.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/empty.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/exception_guard.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/exchange.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/forward.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/forward_like.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/in_place.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/integer_sequence.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/is_pointer_in_range.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/move.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/no_destroy.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/pair.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/piecewise_construct.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/priority_tag.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/rel_ops.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/small_buffer.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/swap.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/to_underlying.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__utility/unreachable.h>", "private", "<utility>", "public" ] },
+  { include: [ "<__variant/monostate.h>", "private", "<variant>", "public" ] },
 ]

diff  --git a/libcxx/utils/generate_iwyu_mapping.py b/libcxx/utils/generate_iwyu_mapping.py
index 343538a6cae481..fd669172e29ab5 100644
--- a/libcxx/utils/generate_iwyu_mapping.py
+++ b/libcxx/utils/generate_iwyu_mapping.py
@@ -1,116 +1,74 @@
 #!/usr/bin/env python
 
-import os, pathlib, sys
-
-
-def generate(private, public):
-    return f'{{ include: [ "{private}", "private", "<{public}>", "public" ] }}'
-
-
-def panic(file):
-    print(f"========== {__file__} error ==========", file=sys.stderr)
-    print(
-        f"\tFile '{file}' is a top-level detail header without a mapping",
-        file=sys.stderr,
-    )
-    sys.exit(1)
-
-
-def generate_map(include):
-    detail_files = []
-    detail_directories = []
-    c_headers = []
-
-    for i in include.iterdir():
-        if i.is_dir() and i.name.startswith("__"):
-            detail_directories.append(f"{i.name}")
-            continue
-
-        if i.name.startswith("__"):
-            detail_files.append(i.name)
-            continue
-
-        if i.name.endswith(".h"):
-            c_headers.append(i.name)
-
-    result = []
-    temporary_mappings = {"__locale_dir": "locale"}
-    for i in detail_directories:
-        public_header = temporary_mappings.get(i, i.lstrip("_"))
-        result.append(f'{generate(f"@<{i}/.*>", public_header)},')
-
-    for i in detail_files:
-        public = []
-        if i == "__assert":
-            continue
-        elif i == "__availability":
-            continue
-        elif i == "__bit_reference":
-            continue
-        elif i == "__bits":
-            public = ["bits"]
-        elif i == "__config_site.in":
-            continue
-        elif i == "__config":
-            continue
-        elif i == "__errc":
-            continue
-        elif i == "__hash_table":
-            public = ["unordered_map", "unordered_set"]
-        elif i == "__locale":
-            public = ["locale"]
-        elif i == "__mbstate_t.h":
-            continue
-        elif i == "__mutex_base":
-            continue
-        elif i == "__node_handle":
-            public = ["map", "set", "unordered_map", "unordered_set"]
-        elif i == "__pstl_algorithm":
-            continue
-        elif i == "__pstl_config_site.in":
-            continue
-        elif i == "__pstl_execution":
-            continue
-        elif i == "__pstl_memory":
-            continue
-        elif i == "__pstl_numeric":
-            continue
-        elif i == "__split_buffer":
-            public = ["deque", "vector"]
-        elif i == "__std_clang_module":
-            continue
-        elif i == "__std_mbstate_t.h":
-            continue
-        elif i == "__threading_support":
-            public = ["atomic", "mutex", "semaphore", "thread"]
-        elif i == "__tree":
-            public = ["map", "set"]
-        elif i == "__undef_macros":
-            continue
-        elif i == "__verbose_abort":
-            continue
-        else:
-            panic(i)
-
-        for p in public:
-            result.append(f'{generate(f"<{i}>", p)},')
-
-    result.sort()
-    return result
-
+import libcxx.header_information
+import os
+import pathlib
+import re
+import typing
+
+def IWYU_mapping(header: str) -> typing.Optional[typing.List[str]]:
+    ignore = [
+        "__debug_utils/.+",
+        "__fwd/get[.]h",
+        "__support/.+",
+    ]
+    if any(re.match(pattern, header) for pattern in ignore):
+        return None
+    elif header == "__bits":
+        return ["bits"]
+    elif header in ("__bit_reference", "__fwd/bit_reference.h"):
+        return ["bitset", "vector"]
+    elif header == "__hash_table":
+        return ["unordered_map", "unordered_set"]
+    elif header == "__locale":
+        return ["locale"]
+    elif re.match("__locale_dir/.+", header):
+        return ["locale"]
+    elif re.match("__math/.+", header):
+        return ["cmath"]
+    elif header == "__node_handle":
+        return ["map", "set", "unordered_map", "unordered_set"]
+    elif header == "__split_buffer":
+        return ["deque", "vector"]
+    elif header == "__threading_support":
+        return ["atomic", "mutex", "semaphore", "thread"]
+    elif header == "__tree":
+        return ["map", "set"]
+    elif header == "__fwd/hash.h":
+        return ["functional"]
+    elif header == "__fwd/pair.h":
+        return ["utility"]
+    elif header == "__fwd/subrange.h":
+        return ["ranges"]
+    # Handle remaining forward declaration headers
+    elif re.match("__fwd/(.+)[.]h", header):
+        return [re.match("__fwd/(.+)[.]h", header).group(1)]
+    # Handle detail headers for things like <__algorithm/foo.h>
+    elif re.match("__(.+?)/.+", header):
+        return [re.match("__(.+?)/.+", header).group(1)]
+    else:
+        return None
 
 def main():
-    monorepo_root = pathlib.Path(
-        os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
-    )
-    assert monorepo_root.exists()
-    include = pathlib.Path(os.path.join(monorepo_root, "libcxx", "include"))
-
-    mapping = generate_map(include)
-    data = "[\n  " + "\n  ".join(mapping) + "\n]\n"
-    with open(f"{include}/libcxx.imp", "w") as f:
-        f.write(data)
-
+    mappings = []  # Pairs of (header, public_header)
+    for header in libcxx.header_information.all_headers:
+        public_headers = IWYU_mapping(header)
+        if public_headers is not None:
+            mappings.extend((header, public) for public in public_headers)
+
+    # Validate that we only have valid public header names -- otherwise the mapping above
+    # needs to be updated.
+    for header, public in mappings:
+        if public not in libcxx.header_information.public_headers:
+            raise RuntimeError(f"{header}: Header {public} is not a valid header")
+
+    with open(libcxx.header_information.include / "libcxx.imp", "w") as f:
+        f.write("[\n")
+        for header, public in sorted(mappings):
+            f.write(
+                f'  {{ include: [ "<{header}>", "private", "<{public}>", "public" ] }},\n'
+            )
+        f.write("]\n")
 
 if __name__ == "__main__":
     main()

diff  --git a/libcxx/utils/libcxx/header_information.py b/libcxx/utils/libcxx/header_information.py
index 54e18b5ea533dd..13337f16dc7118 100644
--- a/libcxx/utils/libcxx/header_information.py
+++ b/libcxx/utils/libcxx/header_information.py
@@ -189,6 +189,9 @@ def is_modulemap_header(header):
 test = pathlib.Path(os.path.join(libcxx_root, "test"))
 assert libcxx_root.exists()
 
+all_headers = sorted(
+    p.relative_to(include).as_posix() for p in include.rglob("[a-z]*") if is_header(p)
+)
 toplevel_headers = sorted(
     p.relative_to(include).as_posix() for p in include.glob("[a-z]*") if is_header(p)
 )