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Implement Itanium name mangling support for C++ Modules TS. 

This follows the scheme agreed with Nathan Sidwell, which can be found here:

  https://gcc.gnu.org/wiki/cxx-modules?action=AttachFile

This will be proposed to the itanium-cxx-abi list once we have some experience
with how well it works; the ABI for this TS should be considered unstable until
it is part of the Itanium C++ ABI.

llvm-svn: 312467
This commit is contained in:
Richard Smith 2017-09-04 05:37:53 +00:00
parent ebc1659016
commit dd8b5337e9
16 changed files with 194 additions and 67 deletions
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4
clang/include/clang/AST/Decl.h
View File

@ -372,6 +372,10 @@ public:
return hasCachedLinkage();
}
/// Get the module that owns this declaration for linkage purposes.
/// There only ever is such a module under the C++ Modules TS.
Module *getOwningModuleForLinkage() const;
/// \brief Looks through UsingDecls and ObjCCompatibleAliasDecls for
/// the underlying named decl.
NamedDecl *getUnderlyingDecl() {

2
clang/include/clang/AST/DeclBase.h
View File

@ -733,7 +733,7 @@ public:
return getModuleOwnershipKind() != ModuleOwnershipKind::Unowned;
}
/// Get the module that owns this declaration.
/// Get the module that owns this declaration (for visibility purposes).
Module *getOwningModule() const {
return isFromASTFile() ? getImportedOwningModule() : getLocalOwningModule();
}

15
clang/include/clang/Basic/Module.h
View File

@ -68,7 +68,11 @@ public:
ModuleMapModule,
/// \brief This is a C++ Modules TS module interface unit.
ModuleInterfaceUnit
ModuleInterfaceUnit,
/// \brief This is a fragment of the global module within some C++ Modules
/// TS module.
GlobalModuleFragment,
};
/// \brief The kind of this module.
@ -391,6 +395,15 @@ public:
return IsFramework && Parent && Parent->isPartOfFramework();
}
/// Set the parent of this module. This should only be used if the parent
/// could not be set during module creation.
void setParent(Module *M) {
assert(!Parent);
Parent = M;
Parent->SubModuleIndex[Name] = Parent->SubModules.size();
Parent->SubModules.push_back(this);
}
/// \brief Retrieve the full name of this module, including the path from
/// its top-level module.
/// \param AllowStringLiterals If \c true, components that might not be

11
clang/include/clang/Lex/ModuleMap.h
View File

@ -472,6 +472,14 @@ public:
bool IsFramework,
bool IsExplicit);
/// \brief Create a 'global module' for a C++ Modules TS module interface
/// unit.
///
/// We model the global module as a submodule of the module interface unit.
/// Unfortunately, we can't create the module interface unit's Module until
/// later, because we don't know what it will be called.
Module *createGlobalModuleForInterfaceUnit(SourceLocation Loc);
/// \brief Create a new module for a C++ Modules TS module interface unit.
/// The module must not already exist, and will be configured for the current
/// compilation.
@ -479,7 +487,8 @@ public:
/// Note that this also sets the current module to the newly-created module.
///
/// \returns The newly-created module.
Module *createModuleForInterfaceUnit(SourceLocation Loc, StringRef Name);
Module *createModuleForInterfaceUnit(SourceLocation Loc, StringRef Name,
Module *GlobalModule);
/// \brief Infer the contents of a framework module map from the given
/// framework directory.

26
clang/lib/AST/Decl.cpp
View File

@ -652,7 +652,7 @@ LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
// If the declaration of an identifier for an object has file
// scope and no storage-class specifier, its linkage is
// external.
LinkageInfo LV;
LinkageInfo LV = getExternalLinkageFor(D);
if (!hasExplicitVisibilityAlready(computation)) {
if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
@ -1399,6 +1399,30 @@ LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
return getLVForDecl(D, usesTypeVisibility(D) ? LVForType : LVForValue);
}
Module *NamedDecl::getOwningModuleForLinkage() const {
Module *M = getOwningModule();
if (!M)
return nullptr;
switch (M->Kind) {
case Module::ModuleMapModule:
// Module map modules have no special linkage semantics.
return nullptr;
case Module::ModuleInterfaceUnit:
return M;
case Module::GlobalModuleFragment:
// External linkage declarations in the global module have no owning module
// for linkage purposes. But internal linkage declarations in the global
// module fragment of a particular module are owned by that module for
// linkage purposes.
return hasExternalFormalLinkage() ? nullptr : M->Parent;
}
llvm_unreachable("unknown module kind");
}
void NamedDecl::printName(raw_ostream &os) const {
os << Name;
}

69
clang/lib/AST/ItaniumMangle.cpp
View File

@ -381,6 +381,7 @@ class CXXNameMangler {
AbiTagState AbiTagsRoot;
llvm::DenseMap<uintptr_t, unsigned> Substitutions;
llvm::DenseMap<StringRef, unsigned> ModuleSubstitutions;
ASTContext &getASTContext() const { return Context.getASTContext(); }
@ -475,6 +476,8 @@ private:
void mangleNameWithAbiTags(const NamedDecl *ND,
const AbiTagList *AdditionalAbiTags);
void mangleModuleName(const Module *M);
void mangleModuleNamePrefix(StringRef Name);
void mangleTemplateName(const TemplateDecl *TD,
const TemplateArgument *TemplateArgs,
unsigned NumTemplateArgs);
@ -845,9 +848,9 @@ void CXXNameMangler::mangleName(const NamedDecl *ND) {
void CXXNameMangler::mangleNameWithAbiTags(const NamedDecl *ND,
const AbiTagList *AdditionalAbiTags) {
// <name> ::= <nested-name>
// ::= <unscoped-name>
// ::= <unscoped-template-name> <template-args>
// <name> ::= [<module-name>] <nested-name>
// ::= [<module-name>] <unscoped-name>
// ::= [<module-name>] <unscoped-template-name> <template-args>
// ::= <local-name>
//
const DeclContext *DC = getEffectiveDeclContext(ND);
@ -866,6 +869,19 @@ void CXXNameMangler::mangleNameWithAbiTags(const NamedDecl *ND,
DC = IgnoreLinkageSpecDecls(DC);
if (isLocalContainerContext(DC)) {
mangleLocalName(ND, AdditionalAbiTags);
return;
}
// Do not mangle the owning module for an external linkage declaration.
// This enables backwards-compatibility with non-modular code, and is
// a valid choice since conflicts are not permitted by C++ Modules TS
// [basic.def.odr]/6.2.
if (!ND->hasExternalFormalLinkage())
if (Module *M = ND->getOwningModuleForLinkage())
mangleModuleName(M);
if (DC->isTranslationUnit() || isStdNamespace(DC)) {
// Check if we have a template.
const TemplateArgumentList *TemplateArgs = nullptr;
@ -879,12 +895,42 @@ void CXXNameMangler::mangleNameWithAbiTags(const NamedDecl *ND,
return;
}
if (isLocalContainerContext(DC)) {
mangleLocalName(ND, AdditionalAbiTags);
mangleNestedName(ND, DC, AdditionalAbiTags);
}
void CXXNameMangler::mangleModuleName(const Module *M) {
// Implement the C++ Modules TS name mangling proposal; see
// https://gcc.gnu.org/wiki/cxx-modules?action=AttachFile
//
// <module-name> ::= W <unscoped-name>+ E
// ::= W <module-subst> <unscoped-name>* E
Out << 'W';
mangleModuleNamePrefix(M->Name);
Out << 'E';
}
void CXXNameMangler::mangleModuleNamePrefix(StringRef Name) {
// <module-subst> ::= _ <seq-id> # 0 < seq-id < 10
// ::= W <seq-id - 10> _ # otherwise
auto It = ModuleSubstitutions.find(Name);
if (It != ModuleSubstitutions.end()) {
if (It->second < 10)
Out << '_' << static_cast<char>('0' + It->second);
else
Out << 'W' << (It->second - 10) << '_';
return;
}
mangleNestedName(ND, DC, AdditionalAbiTags);
// FIXME: Preserve hierarchy in module names rather than flattening
// them to strings; use Module*s as substitution keys.
auto Parts = Name.rsplit('.');
if (Parts.second.empty())
Parts.second = Parts.first;
else
mangleModuleNamePrefix(Parts.first);
Out << Parts.second.size() << Parts.second;
ModuleSubstitutions.insert({Name, ModuleSubstitutions.size()});
}
void CXXNameMangler::mangleTemplateName(const TemplateDecl *TD,
@ -1233,13 +1279,16 @@ void CXXNameMangler::mangleUnqualifiedName(const NamedDecl *ND,
}
if (II) {
// We must avoid conflicts between internally- and externally-
// linked variable and function declaration names in the same TU:
// Match GCC's naming convention for internal linkage symbols, for
// symbols that are not actually visible outside of this TU. GCC
// distinguishes between internal and external linkage symbols in
// its mangling, to support cases like this that were valid C++ prior
// to DR426:
//
// void test() { extern void foo(); }
// static void foo();
// This naming convention is the same as that followed by GCC,
// though it shouldn't actually matter.
if (ND && ND->getFormalLinkage() == InternalLinkage &&
!ND->isExternallyVisible() &&
getEffectiveDeclContext(ND)->isFileContext())
Out << 'L';

13
clang/lib/Lex/ModuleMap.cpp
View File

@ -746,8 +746,16 @@ std::pair<Module *, bool> ModuleMap::findOrCreateModule(StringRef Name,
return std::make_pair(Result, true);
}
Module *ModuleMap::createGlobalModuleForInterfaceUnit(SourceLocation Loc) {
auto *Result = new Module("<global>", Loc, nullptr, /*IsFramework*/ false,
/*IsExplicit*/ true, NumCreatedModules++);
Result->Kind = Module::GlobalModuleFragment;
return Result;
}
Module *ModuleMap::createModuleForInterfaceUnit(SourceLocation Loc,
StringRef Name) {
StringRef Name,
Module *GlobalModule) {
assert(LangOpts.CurrentModule == Name && "module name mismatch");
assert(!Modules[Name] && "redefining existing module");
@ -757,6 +765,9 @@ Module *ModuleMap::createModuleForInterfaceUnit(SourceLocation Loc,
Result->Kind = Module::ModuleInterfaceUnit;
Modules[Name] = SourceModule = Result;
// Reparent the current global module fragment as a submodule of this module.
GlobalModule->setParent(Result);
// Mark the main source file as being within the newly-created module so that
// declarations and macros are properly visibility-restricted to it.
auto *MainFile = SourceMgr.getFileEntryForID(SourceMgr.getMainFileID());

18
clang/lib/Sema/Sema.cpp
View File

@ -766,10 +766,24 @@ void Sema::emitAndClearUnusedLocalTypedefWarnings() {
/// declarations.
void Sema::ActOnStartOfTranslationUnit() {
if (getLangOpts().ModulesTS) {
SourceLocation StartOfTU =
SourceMgr.getLocForStartOfFile(SourceMgr.getMainFileID());
// We start in the global module; all those declarations are implicitly
// module-private (though they do not have module linkage).
Context.getTranslationUnitDecl()->setModuleOwnershipKind(
Decl::ModuleOwnershipKind::ModulePrivate);
auto &Map = PP.getHeaderSearchInfo().getModuleMap();
auto *GlobalModule = Map.createGlobalModuleForInterfaceUnit(StartOfTU);
assert(GlobalModule && "module creation should not fail");
// Enter the scope of the global module.
ModuleScopes.push_back({});
ModuleScopes.back().Module = GlobalModule;
VisibleModules.setVisible(GlobalModule, StartOfTU);
// All declarations created from now on are owned by the global module.
auto *TU = Context.getTranslationUnitDecl();
TU->setModuleOwnershipKind(Decl::ModuleOwnershipKind::Visible);
TU->setLocalOwningModule(GlobalModule);
}
}

20
clang/lib/Sema/SemaDecl.cpp
View File

@ -16052,6 +16052,9 @@ Sema::DeclGroupPtrTy Sema::ActOnModuleDecl(SourceLocation StartLoc,
SourceLocation ModuleLoc,
ModuleDeclKind MDK,
ModuleIdPath Path) {
assert(getLangOpts().ModulesTS &&
"should only have module decl in modules TS");
// A module implementation unit requires that we are not compiling a module
// of any kind. A module interface unit requires that we are not compiling a
// module map.
@ -16104,10 +16107,10 @@ Sema::DeclGroupPtrTy Sema::ActOnModuleDecl(SourceLocation StartLoc,
auto &Map = PP.getHeaderSearchInfo().getModuleMap();
Module *Mod;
assert(ModuleScopes.size() == 1 && "expected to be at global module scope");
switch (MDK) {
case ModuleDeclKind::Module: {
// FIXME: Check we're not in a submodule.
// We can't have parsed or imported a definition of this module or parsed a
// module map defining it already.
if (auto *M = Map.findModule(ModuleName)) {
@ -16121,7 +16124,8 @@ Sema::DeclGroupPtrTy Sema::ActOnModuleDecl(SourceLocation StartLoc,
}
// Create a Module for the module that we're defining.
Mod = Map.createModuleForInterfaceUnit(ModuleLoc, ModuleName);
Mod = Map.createModuleForInterfaceUnit(ModuleLoc, ModuleName,
ModuleScopes.front().Module);
assert(Mod && "module creation should not fail");
break;
}
@ -16140,16 +16144,16 @@ Sema::DeclGroupPtrTy Sema::ActOnModuleDecl(SourceLocation StartLoc,
break;
}
// Enter the semantic scope of the module.
ModuleScopes.push_back({});
// Switch from the global module to the named module.
ModuleScopes.back().Module = Mod;
ModuleScopes.back().OuterVisibleModules = std::move(VisibleModules);
VisibleModules.setVisible(Mod, ModuleLoc);
// From now on, we have an owning module for all declarations we see.
// However, those declarations are module-private unless explicitly
// exported.
Context.getTranslationUnitDecl()->setLocalOwningModule(Mod);
auto *TU = Context.getTranslationUnitDecl();
TU->setModuleOwnershipKind(Decl::ModuleOwnershipKind::ModulePrivate);
TU->setLocalOwningModule(Mod);
// FIXME: Create a ModuleDecl.
return nullptr;
@ -16327,7 +16331,7 @@ Decl *Sema::ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
// C++ Modules TS draft:
// An export-declaration shall appear in the purview of a module other than
// the global module.
if (ModuleScopes.empty() || !ModuleScopes.back().Module ||
if (ModuleScopes.empty() ||
ModuleScopes.back().Module->Kind != Module::ModuleInterfaceUnit)
Diag(ExportLoc, diag::err_export_not_in_module_interface);

5
clang/lib/Serialization/ASTReader.cpp
View File

@ -4871,7 +4871,6 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
bool First = true;
Module *CurrentModule = nullptr;
Module::ModuleKind ModuleKind = Module::ModuleMapModule;
RecordData Record;
while (true) {
llvm::BitstreamEntry Entry = F.Stream.advanceSkippingSubblocks();
@ -4919,6 +4918,7 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
unsigned Idx = 0;
SubmoduleID GlobalID = getGlobalSubmoduleID(F, Record[Idx++]);
SubmoduleID Parent = getGlobalSubmoduleID(F, Record[Idx++]);
Module::ModuleKind Kind = (Module::ModuleKind)Record[Idx++];
bool IsFramework = Record[Idx++];
bool IsExplicit = Record[Idx++];
bool IsSystem = Record[Idx++];
@ -4965,7 +4965,7 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
CurrentModule->PresumedModuleMapFile = F.ModuleMapPath;
}
CurrentModule->Kind = ModuleKind;
CurrentModule->Kind = Kind;
CurrentModule->Signature = F.Signature;
CurrentModule->IsFromModuleFile = true;
CurrentModule->IsSystem = IsSystem || CurrentModule->IsSystem;
@ -5064,7 +5064,6 @@ ASTReader::ReadSubmoduleBlock(ModuleFile &F, unsigned ClientLoadCapabilities) {
SubmodulesLoaded.resize(SubmodulesLoaded.size() + F.LocalNumSubmodules);
}
ModuleKind = (Module::ModuleKind)Record[2];
break;
}

5
clang/lib/Serialization/ASTWriter.cpp
View File

@ -2716,6 +2716,7 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_DEFINITION));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Kind
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
@ -2793,8 +2794,7 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
// Write the submodule metadata block.
RecordData::value_type Record[] = {
getNumberOfModules(WritingModule),
FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS,
(unsigned)WritingModule->Kind};
FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS};
Stream.EmitRecord(SUBMODULE_METADATA, Record);
// Write all of the submodules.
@ -2816,6 +2816,7 @@ void ASTWriter::WriteSubmodules(Module *WritingModule) {
RecordData::value_type Record[] = {SUBMODULE_DEFINITION,
ID,
ParentID,
Mod->Kind,
Mod->IsFramework,
Mod->IsExplicit,
Mod->IsSystem,

14
clang/test/CXX/modules-ts/basic/basic.def.odr/p4/module.cpp
View File

@ -4,15 +4,15 @@
// CHECK-DAG: @extern_var_exported = external global
// FIXME: Should this be 'external global'?
// CHECK-DAG: @inline_var_exported = linkonce_odr global
// CHECK-DAG: @_ZL19static_var_exported = external global
// CHECK-DAG: @_ZW6ModuleE19static_var_exported = external global
// CHECK-DAG: @const_var_exported = external constant
//
// FIXME: The module name should be mangled into all of these.
// CHECK-DAG: @extern_var_module_linkage = external global
// FIXME: Should this be 'external global'?
// CHECK-DAG: @inline_var_module_linkage = linkonce_odr global
// CHECK-DAG: @_ZL25static_var_module_linkage = external global
// CHECK-DAG: @_ZL24const_var_module_linkage = external constant
// CHECK-DAG: @_ZW6ModuleE25static_var_module_linkage = external global
// CHECK-DAG: @_ZW6ModuleE24const_var_module_linkage = external constant
module Module;
@ -28,15 +28,13 @@ void use() {
(void)&const_var_exported;
// FIXME: This symbol should not be visible here.
// CHECK: declare {{.*}}@_ZL26used_static_module_linkagev
// CHECK: declare {{.*}}@_ZW6ModuleE26used_static_module_linkagev
used_static_module_linkage();
// FIXME: The module name should be mangled into the name of this function.
// CHECK: define linkonce_odr {{.*}}@_Z26used_inline_module_linkagev
// CHECK: define linkonce_odr {{.*}}@_ZW6ModuleE26used_inline_module_linkagev
used_inline_module_linkage();
// FIXME: The module name should be mangled into the name of this function.
// CHECK: declare {{.*}}@_Z24noninline_module_linkagev
// CHECK: declare {{.*}}@_ZW6ModuleE24noninline_module_linkagev
noninline_module_linkage();
(void)&extern_var_module_linkage;

29
clang/test/CXX/modules-ts/basic/basic.def.odr/p4/module.cppm
View File

@ -11,7 +11,7 @@
// can discard this global and its initializer (if any), and other TUs are not
// permitted to run the initializer for this variable.
// CHECK-DAG: @inline_var_exported = linkonce_odr global
// CHECK-DAG: @_ZL19static_var_exported = global
// CHECK-DAG: @_ZW6ModuleE19static_var_exported = global
// CHECK-DAG: @const_var_exported = constant
//
// FIXME: The module name should be mangled into all of these.
@ -20,8 +20,8 @@
// can discard this global and its initializer (if any), and other TUs are not
// permitted to run the initializer for this variable.
// CHECK-DAG: @inline_var_module_linkage = linkonce_odr global
// CHECK-DAG: @_ZL25static_var_module_linkage = global
// CHECK-DAG: @_ZL24const_var_module_linkage = constant
// CHECK-DAG: @_ZW6ModuleE25static_var_module_linkage = global
// CHECK-DAG: @_ZW6ModuleE24const_var_module_linkage = constant
static void unused_static_global_module() {}
static void used_static_global_module() {}
@ -57,9 +57,9 @@ export module Module;
export {
// FIXME: These should be ill-formed: you can't export an internal linkage
// symbol, per [dcl.module.interface]p2.
// CHECK: define void {{.*}}@_ZL22unused_static_exportedv
// CHECK: define void {{.*}}@_ZW6ModuleE22unused_static_exportedv
static void unused_static_exported() {}
// CHECK: define void {{.*}}@_ZL20used_static_exportedv
// CHECK: define void {{.*}}@_ZW6ModuleE20used_static_exportedv
static void used_static_exported() {}
inline void unused_inline_exported() {}
@ -88,11 +88,9 @@ export {
// FIXME: Ideally we wouldn't emit this as its name is not visible outside this
// TU, but this module interface might contain a template that can use this
// function so we conservatively emit it for now.
// FIXME: The module name should be mangled into the name of this function.
// CHECK: define void {{.*}}@_ZL28unused_static_module_linkagev
// CHECK: define void {{.*}}@_ZW6ModuleE28unused_static_module_linkagev
static void unused_static_module_linkage() {}
// FIXME: The module name should be mangled into the name of this function.
// CHECK: define void {{.*}}@_ZL26used_static_module_linkagev
// CHECK: define void {{.*}}@_ZW6ModuleE26used_static_module_linkagev
static void used_static_module_linkage() {}
inline void unused_inline_module_linkage() {}
@ -103,12 +101,10 @@ inline int inline_var_module_linkage;
static int static_var_module_linkage;
const int const_var_module_linkage = 3;
// FIXME: The module name should be mangled into the name of this function.
// CHECK: define void {{.*}}@_Z24noninline_module_linkagev
// CHECK: define void {{.*}}@_ZW6ModuleE24noninline_module_linkagev
void noninline_module_linkage() {
used_static_module_linkage();
// FIXME: The module name should be mangled into the name of this function.
// CHECK: define linkonce_odr {{.*}}@_Z26used_inline_module_linkagev
// CHECK: define linkonce_odr {{.*}}@_ZW6ModuleE26used_inline_module_linkagev
used_inline_module_linkage();
(void)&extern_var_module_linkage;
@ -116,3 +112,10 @@ void noninline_module_linkage() {
(void)&static_var_module_linkage;
(void)&const_var_module_linkage;
}
struct a {
struct b {};
struct c {};
};
// CHECK: define void @_ZW6ModuleE1fW_0EN1a1bEW_0ENS_1cE(
void f(a::b, a::c) {}

2
clang/test/CXX/modules-ts/basic/basic.def.odr/p4/user.cpp
View File

@ -5,7 +5,7 @@
// FIXME: Should this be 'external global'?
// CHECK-DAG: @inline_var_exported = linkonce_odr global
// FIXME: These should be 'extern global' and 'extern constant'.
// CHECK-DAG: @_ZL19static_var_exported = global
// CHECK-DAG: @_ZW6ModuleE19static_var_exported = global
// CHECK-DAG: @const_var_exported = constant
import Module;

16
clang/test/CXX/modules-ts/codegen-basics.cppm
View File

@ -4,20 +4,18 @@
export module FooBar;
export {
// CHECK-LABEL: define i32 @_Z1fv(
// CHECK-DAG: define i32 @_Z1fv(
int f() { return 0; }
}
// CHECK-LABEL: define weak_odr void @_Z2f2v(
// CHECK-DAG: define weak_odr void @_ZW6FooBarE2f2v(
inline void f2() { }
// CHECK-DAG: define void @_ZW6FooBarE2f3v(
static void f3() {}
export void use_f3() { f3(); }
// FIXME: Emit global variables and their initializers with this TU.
// Emit an initialization function that other TUs can call, with guard variable.
// FIXME: Mangle non-exported symbols so they don't collide with
// non-exported symbols from other modules?
// FIXME: Formally-internal-linkage symbols that are used from an exported
// symbol need a mangled name and external linkage.
// Emit an initialization function that other TUs can call, with guard variable?
// FIXME: const-qualified variables don't have implicit internal linkage when owned by a module.

12
clang/test/SemaCXX/modules-ts.cppm
View File

@ -1,7 +1,7 @@
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.pcm -verify -DTEST=0
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.pcm -verify -DTEST=1
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.pcm -o %t.pcm -verify -DTEST=2
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.pcm -o %t.pcm -verify -Dfoo=bar -DTEST=3
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.0.pcm -verify -DTEST=0
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -o %t.1.pcm -verify -DTEST=1
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.0.pcm -o %t.2.pcm -verify -DTEST=2
// RUN: %clang_cc1 -std=c++1z -fmodules-ts -emit-module-interface %s -fmodule-file=%t.0.pcm -o %t.3.pcm -verify -Dfoo=bar -DTEST=3
#if TEST == 0
// expected-no-diagnostics
@ -21,7 +21,7 @@ static int m;
// expected-note-re@modules-ts.cppm:1 {{'{{.*}}modules-ts.cppm' included multiple times, additional include site in header from module 'foo'}}
#endif
int n;
#if TEST >= 2
#if TEST == 2
// expected-error@-2 {{redefinition of '}}
// expected-note@-3 {{unguarded header; consider using #ifdef guards or #pragma once}}
// FIXME: We should drop the "header from" in this diagnostic.
@ -60,7 +60,7 @@ int use_b = b;
int use_n = n; // FIXME: this should not be visible, because it is not exported
extern int n;
static_assert(&n == p); // FIXME: these are not the same entity
static_assert(&n != p);
#endif