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The warning warns on TypedefNameDecls -- typedefs and C++11 using aliases --
that are !isReferenced(). Since the isReferenced() bit on TypedefNameDecls
wasn't used for anything before this warning it wasn't always set correctly,
so this patch also adds a few missing MarkAnyDeclReferenced() calls in
various places for TypedefNameDecls.
This is made a bit complicated due to local typedefs possibly being used only
after their local scope has closed. Consider:
template <class T>
void template_fun(T t) {
typename T::Foo s3foo; // YYY
(void)s3foo;
}
void template_fun_user() {
struct Local {
typedef int Foo; // XXX
} p;
template_fun(p);
}
Here the typedef in XXX is only used at end-of-translation unit, when YYY in
template_fun() gets instantiated. To handle this, typedefs that are unused when
their scope exits are added to a set of potentially unused typedefs, and that
set gets checked at end-of-TU. Typedefs that are still unused at that point then
get warned on. There's also serialization code for this set, so that the
warning works with precompiled headers and modules. For modules, the warning
is emitted when the module is built, for precompiled headers each time the
header gets used.
Finally, consider a function using C++14 auto return types to return a local
type defined in a header:
auto f() {
struct S { typedef int a; };
return S();
}
Here, the typedef escapes its local scope and could be used by only some
translation units including the header. To not warn on this, add a
RecursiveASTVisitor that marks all delcs on local types returned from auto
functions as referenced. (Except if it's a function with internal linkage, or
the decls are private and the local type has no friends -- in these cases, it
_is_ safe to warn.)
Several of the included testcases (most of the interesting ones) were provided
by Richard Smith.
(gcc's spelling -Wunused-local-typedefs is supported as an alias for this
warning.)
llvm-svn: 217298
312 lines
11 KiB
C++
312 lines
11 KiB
C++
//===--- MultiplexExternalSemaSource.cpp ---------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the event dispatching to the subscribed clients.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/MultiplexExternalSemaSource.h"
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#include "clang/AST/DeclContextInternals.h"
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#include "clang/Sema/Lookup.h"
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using namespace clang;
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///\brief Constructs a new multiplexing external sema source and appends the
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/// given element to it.
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///
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///\param[in] source - An ExternalSemaSource.
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///
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MultiplexExternalSemaSource::MultiplexExternalSemaSource(ExternalSemaSource &s1,
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ExternalSemaSource &s2){
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Sources.push_back(&s1);
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Sources.push_back(&s2);
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}
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// pin the vtable here.
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MultiplexExternalSemaSource::~MultiplexExternalSemaSource() {}
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///\brief Appends new source to the source list.
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///
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///\param[in] source - An ExternalSemaSource.
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///
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void MultiplexExternalSemaSource::addSource(ExternalSemaSource &source) {
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Sources.push_back(&source);
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}
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//===----------------------------------------------------------------------===//
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// ExternalASTSource.
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//===----------------------------------------------------------------------===//
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Decl *MultiplexExternalSemaSource::GetExternalDecl(uint32_t ID) {
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for(size_t i = 0; i < Sources.size(); ++i)
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if (Decl *Result = Sources[i]->GetExternalDecl(ID))
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return Result;
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return nullptr;
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}
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void MultiplexExternalSemaSource::CompleteRedeclChain(const Decl *D) {
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for (size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->CompleteRedeclChain(D);
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}
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Selector MultiplexExternalSemaSource::GetExternalSelector(uint32_t ID) {
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Selector Sel;
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for(size_t i = 0; i < Sources.size(); ++i) {
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Sel = Sources[i]->GetExternalSelector(ID);
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if (!Sel.isNull())
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return Sel;
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}
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return Sel;
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}
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uint32_t MultiplexExternalSemaSource::GetNumExternalSelectors() {
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uint32_t total = 0;
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for(size_t i = 0; i < Sources.size(); ++i)
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total += Sources[i]->GetNumExternalSelectors();
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return total;
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}
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Stmt *MultiplexExternalSemaSource::GetExternalDeclStmt(uint64_t Offset) {
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for(size_t i = 0; i < Sources.size(); ++i)
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if (Stmt *Result = Sources[i]->GetExternalDeclStmt(Offset))
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return Result;
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return nullptr;
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}
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CXXBaseSpecifier *MultiplexExternalSemaSource::GetExternalCXXBaseSpecifiers(
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uint64_t Offset){
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for(size_t i = 0; i < Sources.size(); ++i)
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if (CXXBaseSpecifier *R = Sources[i]->GetExternalCXXBaseSpecifiers(Offset))
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return R;
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return nullptr;
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}
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bool MultiplexExternalSemaSource::
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FindExternalVisibleDeclsByName(const DeclContext *DC, DeclarationName Name) {
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bool AnyDeclsFound = false;
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for (size_t i = 0; i < Sources.size(); ++i)
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AnyDeclsFound |= Sources[i]->FindExternalVisibleDeclsByName(DC, Name);
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return AnyDeclsFound;
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}
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void MultiplexExternalSemaSource::completeVisibleDeclsMap(const DeclContext *DC){
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->completeVisibleDeclsMap(DC);
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}
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ExternalLoadResult MultiplexExternalSemaSource::
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FindExternalLexicalDecls(const DeclContext *DC,
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bool (*isKindWeWant)(Decl::Kind),
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SmallVectorImpl<Decl*> &Result) {
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for(size_t i = 0; i < Sources.size(); ++i)
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// FIXME: The semantics of the return result is unclear to me...
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Sources[i]->FindExternalLexicalDecls(DC, isKindWeWant, Result);
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return ELR_Success;
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}
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void MultiplexExternalSemaSource::FindFileRegionDecls(FileID File,
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unsigned Offset,
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unsigned Length,
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SmallVectorImpl<Decl *> &Decls){
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->FindFileRegionDecls(File, Offset, Length, Decls);
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}
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void MultiplexExternalSemaSource::CompleteType(TagDecl *Tag) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->CompleteType(Tag);
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}
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void MultiplexExternalSemaSource::CompleteType(ObjCInterfaceDecl *Class) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->CompleteType(Class);
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}
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void MultiplexExternalSemaSource::ReadComments() {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadComments();
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}
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void MultiplexExternalSemaSource::StartedDeserializing() {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->StartedDeserializing();
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}
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void MultiplexExternalSemaSource::FinishedDeserializing() {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->FinishedDeserializing();
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}
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void MultiplexExternalSemaSource::StartTranslationUnit(ASTConsumer *Consumer) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->StartTranslationUnit(Consumer);
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}
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void MultiplexExternalSemaSource::PrintStats() {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->PrintStats();
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}
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bool MultiplexExternalSemaSource::layoutRecordType(const RecordDecl *Record,
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uint64_t &Size,
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uint64_t &Alignment,
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llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
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llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
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llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets){
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for(size_t i = 0; i < Sources.size(); ++i)
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if (Sources[i]->layoutRecordType(Record, Size, Alignment, FieldOffsets,
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BaseOffsets, VirtualBaseOffsets))
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return true;
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return false;
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}
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void MultiplexExternalSemaSource::
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getMemoryBufferSizes(MemoryBufferSizes &sizes) const {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->getMemoryBufferSizes(sizes);
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}
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//===----------------------------------------------------------------------===//
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// ExternalSemaSource.
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//===----------------------------------------------------------------------===//
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void MultiplexExternalSemaSource::InitializeSema(Sema &S) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->InitializeSema(S);
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}
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void MultiplexExternalSemaSource::ForgetSema() {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ForgetSema();
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}
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void MultiplexExternalSemaSource::ReadMethodPool(Selector Sel) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadMethodPool(Sel);
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}
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void MultiplexExternalSemaSource::ReadKnownNamespaces(
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SmallVectorImpl<NamespaceDecl*> &Namespaces){
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadKnownNamespaces(Namespaces);
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}
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void MultiplexExternalSemaSource::ReadUndefinedButUsed(
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llvm::DenseMap<NamedDecl*, SourceLocation> &Undefined){
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadUndefinedButUsed(Undefined);
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}
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bool MultiplexExternalSemaSource::LookupUnqualified(LookupResult &R, Scope *S){
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->LookupUnqualified(R, S);
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return !R.empty();
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}
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void MultiplexExternalSemaSource::ReadTentativeDefinitions(
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SmallVectorImpl<VarDecl*> &TentativeDefs) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadTentativeDefinitions(TentativeDefs);
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}
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void MultiplexExternalSemaSource::ReadUnusedFileScopedDecls(
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SmallVectorImpl<const DeclaratorDecl*> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadUnusedFileScopedDecls(Decls);
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}
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void MultiplexExternalSemaSource::ReadDelegatingConstructors(
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SmallVectorImpl<CXXConstructorDecl*> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadDelegatingConstructors(Decls);
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}
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void MultiplexExternalSemaSource::ReadExtVectorDecls(
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SmallVectorImpl<TypedefNameDecl*> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadExtVectorDecls(Decls);
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}
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void MultiplexExternalSemaSource::ReadDynamicClasses(
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SmallVectorImpl<CXXRecordDecl*> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadDynamicClasses(Decls);
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}
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void MultiplexExternalSemaSource::ReadUnusedLocalTypedefNameCandidates(
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llvm::SmallSetVector<const TypedefNameDecl *, 4> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadUnusedLocalTypedefNameCandidates(Decls);
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}
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void MultiplexExternalSemaSource::ReadLocallyScopedExternCDecls(
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SmallVectorImpl<NamedDecl*> &Decls) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadLocallyScopedExternCDecls(Decls);
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}
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void MultiplexExternalSemaSource::ReadReferencedSelectors(
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SmallVectorImpl<std::pair<Selector, SourceLocation> > &Sels) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadReferencedSelectors(Sels);
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}
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void MultiplexExternalSemaSource::ReadWeakUndeclaredIdentifiers(
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SmallVectorImpl<std::pair<IdentifierInfo*, WeakInfo> > &WI) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadWeakUndeclaredIdentifiers(WI);
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}
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void MultiplexExternalSemaSource::ReadUsedVTables(
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SmallVectorImpl<ExternalVTableUse> &VTables) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadUsedVTables(VTables);
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}
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void MultiplexExternalSemaSource::ReadPendingInstantiations(
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SmallVectorImpl<std::pair<ValueDecl*,
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SourceLocation> > &Pending) {
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for(size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadPendingInstantiations(Pending);
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}
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void MultiplexExternalSemaSource::ReadLateParsedTemplates(
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llvm::DenseMap<const FunctionDecl *, LateParsedTemplate *> &LPTMap) {
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for (size_t i = 0; i < Sources.size(); ++i)
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Sources[i]->ReadLateParsedTemplates(LPTMap);
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}
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TypoCorrection MultiplexExternalSemaSource::CorrectTypo(
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const DeclarationNameInfo &Typo,
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int LookupKind, Scope *S, CXXScopeSpec *SS,
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CorrectionCandidateCallback &CCC,
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DeclContext *MemberContext,
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bool EnteringContext,
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const ObjCObjectPointerType *OPT) {
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for (size_t I = 0, E = Sources.size(); I < E; ++I) {
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if (TypoCorrection C = Sources[I]->CorrectTypo(Typo, LookupKind, S, SS, CCC,
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MemberContext,
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EnteringContext, OPT))
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return C;
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}
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return TypoCorrection();
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}
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bool MultiplexExternalSemaSource::MaybeDiagnoseMissingCompleteType(
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SourceLocation Loc, QualType T) {
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for (size_t I = 0, E = Sources.size(); I < E; ++I) {
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if (Sources[I]->MaybeDiagnoseMissingCompleteType(Loc, T))
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return true;
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}
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return false;
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}
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