aeubanks updated this revision to Diff 437420.
aeubanks added a comment.
update docs to only mention `[[clang::lto_visibility_public]]`
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D127876/new/
https://reviews.llvm.org/D127876
Files:
clang/docs/LTOVisibility.rst
clang/lib/CodeGen/CGClass.cpp
clang/lib/CodeGen/CGVTables.cpp
clang/lib/CodeGen/CodeGenModule.h
clang/lib/CodeGen/ItaniumCXXABI.cpp
clang/test/CodeGenCXX/lto-visibility-inference.cpp
Index: clang/test/CodeGenCXX/lto-visibility-inference.cpp
===================================================================
--- clang/test/CodeGenCXX/lto-visibility-inference.cpp
+++ clang/test/CodeGenCXX/lto-visibility-inference.cpp
@@ -79,11 +79,11 @@
// ITANIUM: type.test{{.*}}!"_ZTS2C4"
// MS: type.test{{.*}}!"?AUC4@@"
c4->f();
- // ITANIUM: type.test{{.*}}!"_ZTS2C5"
- // MS: type.test{{.*}}!"?AUC5@@"
+ // ITANIUM-NOT: type.test{{.*}}!"_ZTS2C5"
+ // MS-NOT: type.test{{.*}}!"?AUC5@@"
c5->f();
- // ITANIUM: type.test{{.*}}!"_ZTS2C6"
- // MS: type.test{{.*}}!"?AUC6@@"
+ // ITANIUM-NOT: type.test{{.*}}!"_ZTS2C6"
+ // MS-NOT: type.test{{.*}}!"?AUC6@@"
c6->f();
// ITANIUM: type.test{{.*}}!"_ZTSSt2C7"
// MS-STD: type.test{{.*}}!"?AUC7@std@@"
Index: clang/lib/CodeGen/ItaniumCXXABI.cpp
===================================================================
--- clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -668,8 +668,8 @@
CGM.HasHiddenLTOVisibility(RD);
bool ShouldEmitWPDInfo =
CGM.getCodeGenOpts().WholeProgramVTables &&
- // Don't insert type tests if we are forcing public std visibility.
- !CGM.HasLTOVisibilityPublicStd(RD);
+ // Don't insert type tests if we are forcing public visibility.
+ !CGM.AlwaysHasLTOVisibilityPublic(RD);
llvm::Value *VirtualFn = nullptr;
{
Index: clang/lib/CodeGen/CodeGenModule.h
===================================================================
--- clang/lib/CodeGen/CodeGenModule.h
+++ clang/lib/CodeGen/CodeGenModule.h
@@ -1382,10 +1382,10 @@
/// optimization.
bool HasHiddenLTOVisibility(const CXXRecordDecl *RD);
- /// Returns whether the given record has public std LTO visibility
- /// and therefore may not participate in (single-module) CFI and whole-program
- /// vtable optimization.
- bool HasLTOVisibilityPublicStd(const CXXRecordDecl *RD);
+ /// Returns whether the given record has public LTO visibility (regardless of
+ /// -lto-whole-program-visibility) and therefore may not participate in
+ /// (single-module) CFI and whole-program vtable optimization.
+ bool AlwaysHasLTOVisibilityPublic(const CXXRecordDecl *RD);
/// Returns the vcall visibility of the given type. This is the scope in which
/// a virtual function call could be made which ends up being dispatched to a
Index: clang/lib/CodeGen/CGVTables.cpp
===================================================================
--- clang/lib/CodeGen/CGVTables.cpp
+++ clang/lib/CodeGen/CGVTables.cpp
@@ -1175,7 +1175,10 @@
DeferredVTables.clear();
}
-bool CodeGenModule::HasLTOVisibilityPublicStd(const CXXRecordDecl *RD) {
+bool CodeGenModule::AlwaysHasLTOVisibilityPublic(const CXXRecordDecl *RD) {
+ if (RD->hasAttr<LTOVisibilityPublicAttr>() || RD->hasAttr<UuidAttr>())
+ return true;
+
if (!getCodeGenOpts().LTOVisibilityPublicStd)
return false;
@@ -1200,9 +1203,6 @@
if (!isExternallyVisible(LV.getLinkage()))
return true;
- if (RD->hasAttr<LTOVisibilityPublicAttr>() || RD->hasAttr<UuidAttr>())
- return false;
-
if (getTriple().isOSBinFormatCOFF()) {
if (RD->hasAttr<DLLExportAttr>() || RD->hasAttr<DLLImportAttr>())
return false;
@@ -1211,7 +1211,7 @@
return false;
}
- return !HasLTOVisibilityPublicStd(RD);
+ return !AlwaysHasLTOVisibilityPublic(RD);
}
llvm::GlobalObject::VCallVisibility CodeGenModule::GetVCallVisibilityLevel(
Index: clang/lib/CodeGen/CGClass.cpp
===================================================================
--- clang/lib/CodeGen/CGClass.cpp
+++ clang/lib/CodeGen/CGClass.cpp
@@ -2695,9 +2695,9 @@
if (SanOpts.has(SanitizerKind::CFIVCall))
EmitVTablePtrCheckForCall(RD, VTable, CodeGenFunction::CFITCK_VCall, Loc);
else if (CGM.getCodeGenOpts().WholeProgramVTables &&
- // Don't insert type test assumes if we are forcing public std
+ // Don't insert type test assumes if we are forcing public
// visibility.
- !CGM.HasLTOVisibilityPublicStd(RD)) {
+ !CGM.AlwaysHasLTOVisibilityPublic(RD)) {
llvm::Metadata *MD =
CGM.CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
llvm::Value *TypeId =
Index: clang/docs/LTOVisibility.rst
===================================================================
--- clang/docs/LTOVisibility.rst
+++ clang/docs/LTOVisibility.rst
@@ -35,13 +35,14 @@
(e.g. classes declared in unnamed namespaces) also receive hidden LTO
visibility.
-During the LTO link, all classes with public LTO visibility will be refined
-to hidden LTO visibility when the ``--lto-whole-program-visibility`` lld linker
-option is applied (``-plugin-opt=whole-program-visibility`` for gold). This flag
-can be used to defer specifying whether classes have hidden LTO visibility until
-link time, to allow bitcode objects to be shared by different LTO links.
-Due to an implementation limitation, symbols associated with classes with hidden
-LTO visibility may still be exported from the binary when using this flag. It is
+During the LTO link, all classes with public LTO visibility but not marked with
+``[[clang::lto_visibility_public]]`` (see below) will be refined to hidden LTO
+visibility when the ``--lto-whole-program-visibility`` lld linker option is
+applied (``-plugin-opt=whole-program-visibility`` for gold). This flag can be
+used to defer specifying whether classes have hidden LTO visibility until link
+time, to allow bitcode objects to be shared by different LTO links. Due to an
+implementation limitation, symbols associated with classes with hidden LTO
+visibility may still be exported from the binary when using this flag. It is
unsafe to refer to these symbols, and their visibility may be relaxed to hidden
in a future compiler release.
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