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714ffd182c
Reported by: mikael Obtained from: https://cgit.freebsd.org/ports/commit/?id=2ea9b7459046eac3f7f3fcd7515cb0fb0340fccb
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
--- build/rust/allocator/alias.h.orig 2025-05-20 09:16:26 UTC
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+++ build/rust/allocator/alias.h
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@@ -0,0 +1,37 @@
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+// Copyright 2023 The Chromium Authors
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+// Use of this source code is governed by a BSD-style license that can be
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+// found in the LICENSE file.
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+
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+// This file has been copied from //base/debug/alias.h (and then trimmed to just
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+// the APIs / macros needed by //build/rust/std; additionally the APIs were
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+// moved into the `build_rust_std` namespace).
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+//
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+// TODO(crbug.com/40279749): Avoid code duplication / reuse code.
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+
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+#ifndef BUILD_RUST_ALLOCATOR_ALIAS_H_
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+#define BUILD_RUST_ALLOCATOR_ALIAS_H_
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+
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+#include <stddef.h>
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+
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+namespace build_rust_std {
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+namespace debug {
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+
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+// Make the optimizer think that |var| is aliased. This can be used to prevent a
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+// local variable from being optimized out (which is something that
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+// `NO_CODE_FOLDING` macro definition below depends on). See
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+// //base/debug/alias.h for more details.
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+void Alias(const void* var);
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+
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+} // namespace debug
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+
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+} // namespace build_rust_std
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+
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+// Prevent code folding (where a linker identifies functions that are
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+// bit-identical and overlays them, which saves space but it leads to confusing
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+// call stacks because multiple symbols are at the same address). See
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+// //base/debug/alias.h for more details.
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+#define NO_CODE_FOLDING() \
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+ const int line_number = __LINE__; \
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+ build_rust_std::debug::Alias(&line_number)
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+
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+#endif // BUILD_RUST_ALLOCATOR_ALIAS_H_
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