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[Sema] Add `-fvisibility-global-new-delete=` option (#75364) By default the implicitly declared replaceable global new and delete operators are given a default visibility attribute. Previous work, see: https://reviews.llvm.org/D53787, added `-fvisibility-global-new-delete-hidden` to change this to a hidden visibility attribute. This change adds `-fvisibility-global-new-delete=` which controls whether (or not) to add an implicit visibility attribute to the implicit declarations for these functions, and what visibility that attribute will specify. The option takes 4 values: `force-hidden`, `force-protected`, `force-default` and `source`. Option values `force-hidden`, `force-protected` and `force-default` assign hidden, protected, and default visibilities respectively; the use of the term force in the value names is designed to imply to a user that the semantics of this option differ significantly from `-fvisibility=`. An option value of `source` implies that no implicit attribute is added; without the attribute the replaceable global new and delete operators behave normally (like other functions) with respect to visibility attributes, pragmas and options. The motivation for the `source` value is to facilitate users who intend to replace these functions either for a single linkage unit or a limited set of linkage units. `-fvisibility-global-new-delete=source` can be applied globally to the compilations in a build where the existing `-fvisibility-global-new-delete-hidden` cannot, as it conflicts with a common pattern where these functions are dynamically imported. The existing `-fvisibility-global-new-delete-hidden` is now a deprecated spelling of `-fvisibility-global-new-delete=force-hidden` A release note has been added for these changes. `-fvisibility-global-new-delete=source` will be set by default for PS5. PS5 users that want the normal toolchain behaviour will be able to supply `-fvisibility-global-new-delete=force-default`.
15 lines
1.1 KiB
C++
15 lines
1.1 KiB
C++
// RUN: %clang_cc1 %s -std=c++11 -triple x86_64-unknown-unknown -fvisibility=hidden -emit-llvm -o - | FileCheck %s -DLINKAGE=dso_local
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// RUN: %clang_cc1 %s -std=c++11 -triple x86_64-unknown-unknown -fvisibility=default -fvisibility-global-new-delete=force-hidden -emit-llvm -o - | FileCheck %s -DLINKAGE=hidden
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// RUN: %clang_cc1 %s -std=c++11 -triple x86_64-unknown-unknown -fvisibility=hidden -fvisibility-global-new-delete=force-protected -emit-llvm -o - | FileCheck %s -DLINKAGE=protected
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// RUN: %clang_cc1 %s -std=c++11 -triple x86_64-unknown-unknown -fvisibility=hidden -fvisibility-global-new-delete=force-default -emit-llvm -o - | FileCheck %s -DLINKAGE=dso_local
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// RUN: %clang_cc1 %s -std=c++11 -triple x86_64-unknown-unknown -fvisibility=hidden -fvisibility-global-new-delete=source -emit-llvm -o - | FileCheck %s -DLINKAGE=hidden
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namespace std {
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typedef __typeof__(sizeof(0)) size_t;
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struct nothrow_t {};
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}
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// Definition which inherits visibility from the implicit compiler generated declaration.
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void operator delete(void*) throw() {}
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// CHECK: define [[LINKAGE]] void @_ZdlPv
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