1905 lines
72 KiB
C++
1905 lines
72 KiB
C++
//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
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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 actions class which performs semantic analysis and
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// builds an AST out of a parse stream.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ASTDiagnostic.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclFriend.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/PrettyDeclStackTrace.h"
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#include "clang/AST/StmtCXX.h"
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Basic/PartialDiagnostic.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Lex/HeaderSearch.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Sema/CXXFieldCollector.h"
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#include "clang/Sema/DelayedDiagnostic.h"
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#include "clang/Sema/ExternalSemaSource.h"
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#include "clang/Sema/Initialization.h"
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#include "clang/Sema/MultiplexExternalSemaSource.h"
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#include "clang/Sema/ObjCMethodList.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Sema/ScopeInfo.h"
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#include "clang/Sema/SemaConsumer.h"
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#include "clang/Sema/SemaInternal.h"
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#include "clang/Sema/TemplateDeduction.h"
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#include "clang/Sema/TemplateInstCallback.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallSet.h"
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using namespace clang;
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using namespace sema;
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SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
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return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
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}
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ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
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PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
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const Preprocessor &PP) {
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PrintingPolicy Policy = Context.getPrintingPolicy();
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// In diagnostics, we print _Bool as bool if the latter is defined as the
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// former.
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Policy.Bool = Context.getLangOpts().Bool;
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if (!Policy.Bool) {
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if (const MacroInfo *BoolMacro = PP.getMacroInfo(Context.getBoolName())) {
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Policy.Bool = BoolMacro->isObjectLike() &&
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BoolMacro->getNumTokens() == 1 &&
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BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
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}
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}
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return Policy;
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}
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void Sema::ActOnTranslationUnitScope(Scope *S) {
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TUScope = S;
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PushDeclContext(S, Context.getTranslationUnitDecl());
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}
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namespace clang {
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namespace sema {
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class SemaPPCallbacks : public PPCallbacks {
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Sema *S = nullptr;
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llvm::SmallVector<SourceLocation, 8> IncludeStack;
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public:
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void set(Sema &S) { this->S = &S; }
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void reset() { S = nullptr; }
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virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
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SrcMgr::CharacteristicKind FileType,
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FileID PrevFID) override {
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if (!S)
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return;
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switch (Reason) {
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case EnterFile: {
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SourceManager &SM = S->getSourceManager();
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SourceLocation IncludeLoc = SM.getIncludeLoc(SM.getFileID(Loc));
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if (IncludeLoc.isValid()) {
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IncludeStack.push_back(IncludeLoc);
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S->DiagnoseNonDefaultPragmaPack(
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Sema::PragmaPackDiagnoseKind::NonDefaultStateAtInclude, IncludeLoc);
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}
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break;
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}
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case ExitFile:
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if (!IncludeStack.empty())
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S->DiagnoseNonDefaultPragmaPack(
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Sema::PragmaPackDiagnoseKind::ChangedStateAtExit,
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IncludeStack.pop_back_val());
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break;
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default:
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break;
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}
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}
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};
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} // end namespace sema
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} // end namespace clang
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Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
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TranslationUnitKind TUKind, CodeCompleteConsumer *CodeCompleter)
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: ExternalSource(nullptr), isMultiplexExternalSource(false),
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FPFeatures(pp.getLangOpts()), LangOpts(pp.getLangOpts()), PP(pp),
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Context(ctxt), Consumer(consumer), Diags(PP.getDiagnostics()),
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SourceMgr(PP.getSourceManager()), CollectStats(false),
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CodeCompleter(CodeCompleter), CurContext(nullptr),
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OriginalLexicalContext(nullptr), MSStructPragmaOn(false),
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MSPointerToMemberRepresentationMethod(
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LangOpts.getMSPointerToMemberRepresentationMethod()),
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VtorDispStack(MSVtorDispAttr::Mode(LangOpts.VtorDispMode)), PackStack(0),
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DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
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CodeSegStack(nullptr), CurInitSeg(nullptr), VisContext(nullptr),
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PragmaAttributeCurrentTargetDecl(nullptr),
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IsBuildingRecoveryCallExpr(false), Cleanup{}, LateTemplateParser(nullptr),
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LateTemplateParserCleanup(nullptr), OpaqueParser(nullptr), IdResolver(pp),
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StdExperimentalNamespaceCache(nullptr), StdInitializerList(nullptr),
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StdCoroutineTraitsCache(nullptr), CXXTypeInfoDecl(nullptr),
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MSVCGuidDecl(nullptr), NSNumberDecl(nullptr), NSValueDecl(nullptr),
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NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
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ValueWithBytesObjCTypeMethod(nullptr), NSArrayDecl(nullptr),
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ArrayWithObjectsMethod(nullptr), NSDictionaryDecl(nullptr),
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DictionaryWithObjectsMethod(nullptr), GlobalNewDeleteDeclared(false),
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TUKind(TUKind), NumSFINAEErrors(0),
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FullyCheckedComparisonCategories(
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static_cast<unsigned>(ComparisonCategoryType::Last) + 1),
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AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
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NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
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CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
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TyposCorrected(0), AnalysisWarnings(*this),
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ThreadSafetyDeclCache(nullptr), VarDataSharingAttributesStack(nullptr),
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CurScope(nullptr), Ident_super(nullptr), Ident___float128(nullptr) {
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TUScope = nullptr;
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LoadedExternalKnownNamespaces = false;
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for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
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NSNumberLiteralMethods[I] = nullptr;
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if (getLangOpts().ObjC1)
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NSAPIObj.reset(new NSAPI(Context));
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if (getLangOpts().CPlusPlus)
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FieldCollector.reset(new CXXFieldCollector());
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// Tell diagnostics how to render things from the AST library.
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Diags.SetArgToStringFn(&FormatASTNodeDiagnosticArgument, &Context);
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ExprEvalContexts.emplace_back(
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ExpressionEvaluationContext::PotentiallyEvaluated, 0, CleanupInfo{},
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nullptr, ExpressionEvaluationContextRecord::EK_Other);
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PreallocatedFunctionScope.reset(new FunctionScopeInfo(Diags));
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// Initilization of data sharing attributes stack for OpenMP
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InitDataSharingAttributesStack();
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std::unique_ptr<sema::SemaPPCallbacks> Callbacks =
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llvm::make_unique<sema::SemaPPCallbacks>();
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SemaPPCallbackHandler = Callbacks.get();
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PP.addPPCallbacks(std::move(Callbacks));
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SemaPPCallbackHandler->set(*this);
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}
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void Sema::addImplicitTypedef(StringRef Name, QualType T) {
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DeclarationName DN = &Context.Idents.get(Name);
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if (IdResolver.begin(DN) == IdResolver.end())
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PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
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}
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void Sema::Initialize() {
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if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
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SC->InitializeSema(*this);
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// Tell the external Sema source about this Sema object.
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if (ExternalSemaSource *ExternalSema
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= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
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ExternalSema->InitializeSema(*this);
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// This needs to happen after ExternalSemaSource::InitializeSema(this) or we
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// will not be able to merge any duplicate __va_list_tag decls correctly.
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VAListTagName = PP.getIdentifierInfo("__va_list_tag");
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if (!TUScope)
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return;
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// Initialize predefined 128-bit integer types, if needed.
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if (Context.getTargetInfo().hasInt128Type()) {
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// If either of the 128-bit integer types are unavailable to name lookup,
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// define them now.
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DeclarationName Int128 = &Context.Idents.get("__int128_t");
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if (IdResolver.begin(Int128) == IdResolver.end())
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PushOnScopeChains(Context.getInt128Decl(), TUScope);
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DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
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if (IdResolver.begin(UInt128) == IdResolver.end())
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PushOnScopeChains(Context.getUInt128Decl(), TUScope);
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}
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// Initialize predefined Objective-C types:
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if (getLangOpts().ObjC1) {
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// If 'SEL' does not yet refer to any declarations, make it refer to the
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// predefined 'SEL'.
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DeclarationName SEL = &Context.Idents.get("SEL");
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if (IdResolver.begin(SEL) == IdResolver.end())
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PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
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// If 'id' does not yet refer to any declarations, make it refer to the
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// predefined 'id'.
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DeclarationName Id = &Context.Idents.get("id");
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if (IdResolver.begin(Id) == IdResolver.end())
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PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
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// Create the built-in typedef for 'Class'.
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DeclarationName Class = &Context.Idents.get("Class");
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if (IdResolver.begin(Class) == IdResolver.end())
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PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
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// Create the built-in forward declaratino for 'Protocol'.
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DeclarationName Protocol = &Context.Idents.get("Protocol");
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if (IdResolver.begin(Protocol) == IdResolver.end())
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PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
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}
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// Create the internal type for the *StringMakeConstantString builtins.
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DeclarationName ConstantString = &Context.Idents.get("__NSConstantString");
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if (IdResolver.begin(ConstantString) == IdResolver.end())
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PushOnScopeChains(Context.getCFConstantStringDecl(), TUScope);
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// Initialize Microsoft "predefined C++ types".
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if (getLangOpts().MSVCCompat) {
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if (getLangOpts().CPlusPlus &&
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IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
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PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
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TUScope);
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addImplicitTypedef("size_t", Context.getSizeType());
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}
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// Initialize predefined OpenCL types and supported extensions and (optional)
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// core features.
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if (getLangOpts().OpenCL) {
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getOpenCLOptions().addSupport(Context.getTargetInfo().getSupportedOpenCLOpts());
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getOpenCLOptions().enableSupportedCore(getLangOpts().OpenCLVersion);
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addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
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addImplicitTypedef("event_t", Context.OCLEventTy);
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if (getLangOpts().OpenCLVersion >= 200) {
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addImplicitTypedef("clk_event_t", Context.OCLClkEventTy);
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addImplicitTypedef("queue_t", Context.OCLQueueTy);
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addImplicitTypedef("reserve_id_t", Context.OCLReserveIDTy);
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addImplicitTypedef("atomic_int", Context.getAtomicType(Context.IntTy));
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addImplicitTypedef("atomic_uint",
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Context.getAtomicType(Context.UnsignedIntTy));
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auto AtomicLongT = Context.getAtomicType(Context.LongTy);
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addImplicitTypedef("atomic_long", AtomicLongT);
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auto AtomicULongT = Context.getAtomicType(Context.UnsignedLongTy);
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addImplicitTypedef("atomic_ulong", AtomicULongT);
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addImplicitTypedef("atomic_float",
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Context.getAtomicType(Context.FloatTy));
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auto AtomicDoubleT = Context.getAtomicType(Context.DoubleTy);
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addImplicitTypedef("atomic_double", AtomicDoubleT);
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// OpenCLC v2.0, s6.13.11.6 requires that atomic_flag is implemented as
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// 32-bit integer and OpenCLC v2.0, s6.1.1 int is always 32-bit wide.
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addImplicitTypedef("atomic_flag", Context.getAtomicType(Context.IntTy));
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auto AtomicIntPtrT = Context.getAtomicType(Context.getIntPtrType());
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addImplicitTypedef("atomic_intptr_t", AtomicIntPtrT);
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auto AtomicUIntPtrT = Context.getAtomicType(Context.getUIntPtrType());
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addImplicitTypedef("atomic_uintptr_t", AtomicUIntPtrT);
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auto AtomicSizeT = Context.getAtomicType(Context.getSizeType());
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addImplicitTypedef("atomic_size_t", AtomicSizeT);
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auto AtomicPtrDiffT = Context.getAtomicType(Context.getPointerDiffType());
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addImplicitTypedef("atomic_ptrdiff_t", AtomicPtrDiffT);
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// OpenCL v2.0 s6.13.11.6:
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// - The atomic_long and atomic_ulong types are supported if the
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// cl_khr_int64_base_atomics and cl_khr_int64_extended_atomics
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// extensions are supported.
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// - The atomic_double type is only supported if double precision
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// is supported and the cl_khr_int64_base_atomics and
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// cl_khr_int64_extended_atomics extensions are supported.
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// - If the device address space is 64-bits, the data types
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// atomic_intptr_t, atomic_uintptr_t, atomic_size_t and
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// atomic_ptrdiff_t are supported if the cl_khr_int64_base_atomics and
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// cl_khr_int64_extended_atomics extensions are supported.
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std::vector<QualType> Atomic64BitTypes;
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Atomic64BitTypes.push_back(AtomicLongT);
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Atomic64BitTypes.push_back(AtomicULongT);
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Atomic64BitTypes.push_back(AtomicDoubleT);
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if (Context.getTypeSize(AtomicSizeT) == 64) {
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Atomic64BitTypes.push_back(AtomicSizeT);
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Atomic64BitTypes.push_back(AtomicIntPtrT);
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Atomic64BitTypes.push_back(AtomicUIntPtrT);
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Atomic64BitTypes.push_back(AtomicPtrDiffT);
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}
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for (auto &I : Atomic64BitTypes)
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setOpenCLExtensionForType(I,
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"cl_khr_int64_base_atomics cl_khr_int64_extended_atomics");
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setOpenCLExtensionForType(AtomicDoubleT, "cl_khr_fp64");
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}
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setOpenCLExtensionForType(Context.DoubleTy, "cl_khr_fp64");
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#define GENERIC_IMAGE_TYPE_EXT(Type, Id, Ext) \
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setOpenCLExtensionForType(Context.Id, Ext);
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#include "clang/Basic/OpenCLImageTypes.def"
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};
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if (Context.getTargetInfo().hasBuiltinMSVaList()) {
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DeclarationName MSVaList = &Context.Idents.get("__builtin_ms_va_list");
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if (IdResolver.begin(MSVaList) == IdResolver.end())
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PushOnScopeChains(Context.getBuiltinMSVaListDecl(), TUScope);
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}
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DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
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if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
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PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
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}
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Sema::~Sema() {
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if (VisContext) FreeVisContext();
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// Kill all the active scopes.
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for (sema::FunctionScopeInfo *FSI : FunctionScopes)
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if (FSI != PreallocatedFunctionScope.get())
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delete FSI;
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// Tell the SemaConsumer to forget about us; we're going out of scope.
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if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
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SC->ForgetSema();
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// Detach from the external Sema source.
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if (ExternalSemaSource *ExternalSema
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= dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
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ExternalSema->ForgetSema();
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// If Sema's ExternalSource is the multiplexer - we own it.
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if (isMultiplexExternalSource)
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delete ExternalSource;
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threadSafety::threadSafetyCleanup(ThreadSafetyDeclCache);
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// Destroys data sharing attributes stack for OpenMP
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DestroyDataSharingAttributesStack();
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// Detach from the PP callback handler which outlives Sema since it's owned
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// by the preprocessor.
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SemaPPCallbackHandler->reset();
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assert(DelayedTypos.empty() && "Uncorrected typos!");
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}
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/// makeUnavailableInSystemHeader - There is an error in the current
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/// context. If we're still in a system header, and we can plausibly
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/// make the relevant declaration unavailable instead of erroring, do
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/// so and return true.
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bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
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UnavailableAttr::ImplicitReason reason) {
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// If we're not in a function, it's an error.
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FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
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if (!fn) return false;
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// If we're in template instantiation, it's an error.
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if (inTemplateInstantiation())
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return false;
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// If that function's not in a system header, it's an error.
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if (!Context.getSourceManager().isInSystemHeader(loc))
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return false;
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// If the function is already unavailable, it's not an error.
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if (fn->hasAttr<UnavailableAttr>()) return true;
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fn->addAttr(UnavailableAttr::CreateImplicit(Context, "", reason, loc));
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return true;
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}
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ASTMutationListener *Sema::getASTMutationListener() const {
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return getASTConsumer().GetASTMutationListener();
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}
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///Registers an external source. If an external source already exists,
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/// creates a multiplex external source and appends to it.
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///
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///\param[in] E - A non-null external sema source.
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///
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void Sema::addExternalSource(ExternalSemaSource *E) {
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assert(E && "Cannot use with NULL ptr");
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if (!ExternalSource) {
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ExternalSource = E;
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return;
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}
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if (isMultiplexExternalSource)
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static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
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else {
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ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
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isMultiplexExternalSource = true;
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}
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}
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/// Print out statistics about the semantic analysis.
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void Sema::PrintStats() const {
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llvm::errs() << "\n*** Semantic Analysis Stats:\n";
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llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
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BumpAlloc.PrintStats();
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AnalysisWarnings.PrintStats();
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}
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void Sema::diagnoseNullableToNonnullConversion(QualType DstType,
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QualType SrcType,
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SourceLocation Loc) {
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Optional<NullabilityKind> ExprNullability = SrcType->getNullability(Context);
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if (!ExprNullability || *ExprNullability != NullabilityKind::Nullable)
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return;
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Optional<NullabilityKind> TypeNullability = DstType->getNullability(Context);
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if (!TypeNullability || *TypeNullability != NullabilityKind::NonNull)
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return;
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Diag(Loc, diag::warn_nullability_lost) << SrcType << DstType;
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}
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void Sema::diagnoseZeroToNullptrConversion(CastKind Kind, const Expr* E) {
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if (Diags.isIgnored(diag::warn_zero_as_null_pointer_constant,
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|
E->getLocStart()))
|
|
return;
|
|
// nullptr only exists from C++11 on, so don't warn on its absence earlier.
|
|
if (!getLangOpts().CPlusPlus11)
|
|
return;
|
|
|
|
if (Kind != CK_NullToPointer && Kind != CK_NullToMemberPointer)
|
|
return;
|
|
if (E->IgnoreParenImpCasts()->getType()->isNullPtrType())
|
|
return;
|
|
|
|
// If it is a macro from system header, and if the macro name is not "NULL",
|
|
// do not warn.
|
|
SourceLocation MaybeMacroLoc = E->getLocStart();
|
|
if (Diags.getSuppressSystemWarnings() &&
|
|
SourceMgr.isInSystemMacro(MaybeMacroLoc) &&
|
|
!findMacroSpelling(MaybeMacroLoc, "NULL"))
|
|
return;
|
|
|
|
Diag(E->getLocStart(), diag::warn_zero_as_null_pointer_constant)
|
|
<< FixItHint::CreateReplacement(E->getSourceRange(), "nullptr");
|
|
}
|
|
|
|
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
|
|
/// If there is already an implicit cast, merge into the existing one.
|
|
/// The result is of the given category.
|
|
ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
|
|
CastKind Kind, ExprValueKind VK,
|
|
const CXXCastPath *BasePath,
|
|
CheckedConversionKind CCK) {
|
|
#ifndef NDEBUG
|
|
if (VK == VK_RValue && !E->isRValue()) {
|
|
switch (Kind) {
|
|
default:
|
|
llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
|
|
"kind");
|
|
case CK_LValueToRValue:
|
|
case CK_ArrayToPointerDecay:
|
|
case CK_FunctionToPointerDecay:
|
|
case CK_ToVoid:
|
|
case CK_NonAtomicToAtomic:
|
|
break;
|
|
}
|
|
}
|
|
assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
|
|
#endif
|
|
|
|
diagnoseNullableToNonnullConversion(Ty, E->getType(), E->getLocStart());
|
|
diagnoseZeroToNullptrConversion(Kind, E);
|
|
|
|
QualType ExprTy = Context.getCanonicalType(E->getType());
|
|
QualType TypeTy = Context.getCanonicalType(Ty);
|
|
|
|
if (ExprTy == TypeTy)
|
|
return E;
|
|
|
|
// C++1z [conv.array]: The temporary materialization conversion is applied.
|
|
// We also use this to fuel C++ DR1213, which applies to C++11 onwards.
|
|
if (Kind == CK_ArrayToPointerDecay && getLangOpts().CPlusPlus &&
|
|
E->getValueKind() == VK_RValue) {
|
|
// The temporary is an lvalue in C++98 and an xvalue otherwise.
|
|
ExprResult Materialized = CreateMaterializeTemporaryExpr(
|
|
E->getType(), E, !getLangOpts().CPlusPlus11);
|
|
if (Materialized.isInvalid())
|
|
return ExprError();
|
|
E = Materialized.get();
|
|
}
|
|
|
|
if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
|
|
if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
|
|
ImpCast->setType(Ty);
|
|
ImpCast->setValueKind(VK);
|
|
return E;
|
|
}
|
|
}
|
|
|
|
return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
|
|
}
|
|
|
|
/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
|
|
/// to the conversion from scalar type ScalarTy to the Boolean type.
|
|
CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
|
|
switch (ScalarTy->getScalarTypeKind()) {
|
|
case Type::STK_Bool: return CK_NoOp;
|
|
case Type::STK_CPointer: return CK_PointerToBoolean;
|
|
case Type::STK_BlockPointer: return CK_PointerToBoolean;
|
|
case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
|
|
case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
|
|
case Type::STK_Integral: return CK_IntegralToBoolean;
|
|
case Type::STK_Floating: return CK_FloatingToBoolean;
|
|
case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
|
|
case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
|
|
}
|
|
llvm_unreachable("unknown scalar type kind");
|
|
}
|
|
|
|
/// Used to prune the decls of Sema's UnusedFileScopedDecls vector.
|
|
static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
|
|
if (D->getMostRecentDecl()->isUsed())
|
|
return true;
|
|
|
|
if (D->isExternallyVisible())
|
|
return true;
|
|
|
|
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
|
|
// If this is a function template and none of its specializations is used,
|
|
// we should warn.
|
|
if (FunctionTemplateDecl *Template = FD->getDescribedFunctionTemplate())
|
|
for (const auto *Spec : Template->specializations())
|
|
if (ShouldRemoveFromUnused(SemaRef, Spec))
|
|
return true;
|
|
|
|
// UnusedFileScopedDecls stores the first declaration.
|
|
// The declaration may have become definition so check again.
|
|
const FunctionDecl *DeclToCheck;
|
|
if (FD->hasBody(DeclToCheck))
|
|
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
|
|
|
|
// Later redecls may add new information resulting in not having to warn,
|
|
// so check again.
|
|
DeclToCheck = FD->getMostRecentDecl();
|
|
if (DeclToCheck != FD)
|
|
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
|
|
}
|
|
|
|
if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
|
|
// If a variable usable in constant expressions is referenced,
|
|
// don't warn if it isn't used: if the value of a variable is required
|
|
// for the computation of a constant expression, it doesn't make sense to
|
|
// warn even if the variable isn't odr-used. (isReferenced doesn't
|
|
// precisely reflect that, but it's a decent approximation.)
|
|
if (VD->isReferenced() &&
|
|
VD->isUsableInConstantExpressions(SemaRef->Context))
|
|
return true;
|
|
|
|
if (VarTemplateDecl *Template = VD->getDescribedVarTemplate())
|
|
// If this is a variable template and none of its specializations is used,
|
|
// we should warn.
|
|
for (const auto *Spec : Template->specializations())
|
|
if (ShouldRemoveFromUnused(SemaRef, Spec))
|
|
return true;
|
|
|
|
// UnusedFileScopedDecls stores the first declaration.
|
|
// The declaration may have become definition so check again.
|
|
const VarDecl *DeclToCheck = VD->getDefinition();
|
|
if (DeclToCheck)
|
|
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
|
|
|
|
// Later redecls may add new information resulting in not having to warn,
|
|
// so check again.
|
|
DeclToCheck = VD->getMostRecentDecl();
|
|
if (DeclToCheck != VD)
|
|
return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool isFunctionOrVarDeclExternC(NamedDecl *ND) {
|
|
if (auto *FD = dyn_cast<FunctionDecl>(ND))
|
|
return FD->isExternC();
|
|
return cast<VarDecl>(ND)->isExternC();
|
|
}
|
|
|
|
/// Determine whether ND is an external-linkage function or variable whose
|
|
/// type has no linkage.
|
|
bool Sema::isExternalWithNoLinkageType(ValueDecl *VD) {
|
|
// Note: it's not quite enough to check whether VD has UniqueExternalLinkage,
|
|
// because we also want to catch the case where its type has VisibleNoLinkage,
|
|
// which does not affect the linkage of VD.
|
|
return getLangOpts().CPlusPlus && VD->hasExternalFormalLinkage() &&
|
|
!isExternalFormalLinkage(VD->getType()->getLinkage()) &&
|
|
!isFunctionOrVarDeclExternC(VD);
|
|
}
|
|
|
|
/// Obtains a sorted list of functions and variables that are undefined but
|
|
/// ODR-used.
|
|
void Sema::getUndefinedButUsed(
|
|
SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
|
|
for (const auto &UndefinedUse : UndefinedButUsed) {
|
|
NamedDecl *ND = UndefinedUse.first;
|
|
|
|
// Ignore attributes that have become invalid.
|
|
if (ND->isInvalidDecl()) continue;
|
|
|
|
// __attribute__((weakref)) is basically a definition.
|
|
if (ND->hasAttr<WeakRefAttr>()) continue;
|
|
|
|
if (isa<CXXDeductionGuideDecl>(ND))
|
|
continue;
|
|
|
|
if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
|
|
// An exported function will always be emitted when defined, so even if
|
|
// the function is inline, it doesn't have to be emitted in this TU. An
|
|
// imported function implies that it has been exported somewhere else.
|
|
continue;
|
|
}
|
|
|
|
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
|
|
if (FD->isDefined())
|
|
continue;
|
|
if (FD->isExternallyVisible() &&
|
|
!isExternalWithNoLinkageType(FD) &&
|
|
!FD->getMostRecentDecl()->isInlined())
|
|
continue;
|
|
if (FD->getBuiltinID())
|
|
continue;
|
|
} else {
|
|
auto *VD = cast<VarDecl>(ND);
|
|
if (VD->hasDefinition() != VarDecl::DeclarationOnly)
|
|
continue;
|
|
if (VD->isExternallyVisible() &&
|
|
!isExternalWithNoLinkageType(VD) &&
|
|
!VD->getMostRecentDecl()->isInline())
|
|
continue;
|
|
|
|
// Skip VarDecls that lack formal definitions but which we know are in
|
|
// fact defined somewhere.
|
|
if (VD->isKnownToBeDefined())
|
|
continue;
|
|
}
|
|
|
|
Undefined.push_back(std::make_pair(ND, UndefinedUse.second));
|
|
}
|
|
}
|
|
|
|
/// checkUndefinedButUsed - Check for undefined objects with internal linkage
|
|
/// or that are inline.
|
|
static void checkUndefinedButUsed(Sema &S) {
|
|
if (S.UndefinedButUsed.empty()) return;
|
|
|
|
// Collect all the still-undefined entities with internal linkage.
|
|
SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
|
|
S.getUndefinedButUsed(Undefined);
|
|
if (Undefined.empty()) return;
|
|
|
|
for (auto Undef : Undefined) {
|
|
ValueDecl *VD = cast<ValueDecl>(Undef.first);
|
|
SourceLocation UseLoc = Undef.second;
|
|
|
|
if (S.isExternalWithNoLinkageType(VD)) {
|
|
// C++ [basic.link]p8:
|
|
// A type without linkage shall not be used as the type of a variable
|
|
// or function with external linkage unless
|
|
// -- the entity has C language linkage
|
|
// -- the entity is not odr-used or is defined in the same TU
|
|
//
|
|
// As an extension, accept this in cases where the type is externally
|
|
// visible, since the function or variable actually can be defined in
|
|
// another translation unit in that case.
|
|
S.Diag(VD->getLocation(), isExternallyVisible(VD->getType()->getLinkage())
|
|
? diag::ext_undefined_internal_type
|
|
: diag::err_undefined_internal_type)
|
|
<< isa<VarDecl>(VD) << VD;
|
|
} else if (!VD->isExternallyVisible()) {
|
|
// FIXME: We can promote this to an error. The function or variable can't
|
|
// be defined anywhere else, so the program must necessarily violate the
|
|
// one definition rule.
|
|
S.Diag(VD->getLocation(), diag::warn_undefined_internal)
|
|
<< isa<VarDecl>(VD) << VD;
|
|
} else if (auto *FD = dyn_cast<FunctionDecl>(VD)) {
|
|
(void)FD;
|
|
assert(FD->getMostRecentDecl()->isInlined() &&
|
|
"used object requires definition but isn't inline or internal?");
|
|
// FIXME: This is ill-formed; we should reject.
|
|
S.Diag(VD->getLocation(), diag::warn_undefined_inline) << VD;
|
|
} else {
|
|
assert(cast<VarDecl>(VD)->getMostRecentDecl()->isInline() &&
|
|
"used var requires definition but isn't inline or internal?");
|
|
S.Diag(VD->getLocation(), diag::err_undefined_inline_var) << VD;
|
|
}
|
|
if (UseLoc.isValid())
|
|
S.Diag(UseLoc, diag::note_used_here);
|
|
}
|
|
|
|
S.UndefinedButUsed.clear();
|
|
}
|
|
|
|
void Sema::LoadExternalWeakUndeclaredIdentifiers() {
|
|
if (!ExternalSource)
|
|
return;
|
|
|
|
SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
|
|
ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
|
|
for (auto &WeakID : WeakIDs)
|
|
WeakUndeclaredIdentifiers.insert(WeakID);
|
|
}
|
|
|
|
|
|
typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
|
|
|
|
/// Returns true, if all methods and nested classes of the given
|
|
/// CXXRecordDecl are defined in this translation unit.
|
|
///
|
|
/// Should only be called from ActOnEndOfTranslationUnit so that all
|
|
/// definitions are actually read.
|
|
static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
|
|
RecordCompleteMap &MNCComplete) {
|
|
RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
|
|
if (Cache != MNCComplete.end())
|
|
return Cache->second;
|
|
if (!RD->isCompleteDefinition())
|
|
return false;
|
|
bool Complete = true;
|
|
for (DeclContext::decl_iterator I = RD->decls_begin(),
|
|
E = RD->decls_end();
|
|
I != E && Complete; ++I) {
|
|
if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
|
|
Complete = M->isDefined() || M->isDefaulted() ||
|
|
(M->isPure() && !isa<CXXDestructorDecl>(M));
|
|
else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
|
|
// If the template function is marked as late template parsed at this
|
|
// point, it has not been instantiated and therefore we have not
|
|
// performed semantic analysis on it yet, so we cannot know if the type
|
|
// can be considered complete.
|
|
Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
|
|
F->getTemplatedDecl()->isDefined();
|
|
else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
|
|
if (R->isInjectedClassName())
|
|
continue;
|
|
if (R->hasDefinition())
|
|
Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
|
|
MNCComplete);
|
|
else
|
|
Complete = false;
|
|
}
|
|
}
|
|
MNCComplete[RD] = Complete;
|
|
return Complete;
|
|
}
|
|
|
|
/// Returns true, if the given CXXRecordDecl is fully defined in this
|
|
/// translation unit, i.e. all methods are defined or pure virtual and all
|
|
/// friends, friend functions and nested classes are fully defined in this
|
|
/// translation unit.
|
|
///
|
|
/// Should only be called from ActOnEndOfTranslationUnit so that all
|
|
/// definitions are actually read.
|
|
static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
|
|
RecordCompleteMap &RecordsComplete,
|
|
RecordCompleteMap &MNCComplete) {
|
|
RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
|
|
if (Cache != RecordsComplete.end())
|
|
return Cache->second;
|
|
bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
|
|
for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
|
|
E = RD->friend_end();
|
|
I != E && Complete; ++I) {
|
|
// Check if friend classes and methods are complete.
|
|
if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
|
|
// Friend classes are available as the TypeSourceInfo of the FriendDecl.
|
|
if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
|
|
Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
|
|
else
|
|
Complete = false;
|
|
} else {
|
|
// Friend functions are available through the NamedDecl of FriendDecl.
|
|
if (const FunctionDecl *FD =
|
|
dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
|
|
Complete = FD->isDefined();
|
|
else
|
|
// This is a template friend, give up.
|
|
Complete = false;
|
|
}
|
|
}
|
|
RecordsComplete[RD] = Complete;
|
|
return Complete;
|
|
}
|
|
|
|
void Sema::emitAndClearUnusedLocalTypedefWarnings() {
|
|
if (ExternalSource)
|
|
ExternalSource->ReadUnusedLocalTypedefNameCandidates(
|
|
UnusedLocalTypedefNameCandidates);
|
|
for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
|
|
if (TD->isReferenced())
|
|
continue;
|
|
Diag(TD->getLocation(), diag::warn_unused_local_typedef)
|
|
<< isa<TypeAliasDecl>(TD) << TD->getDeclName();
|
|
}
|
|
UnusedLocalTypedefNameCandidates.clear();
|
|
}
|
|
|
|
/// This is called before the very first declaration in the translation unit
|
|
/// is parsed. Note that the ASTContext may have already injected some
|
|
/// 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).
|
|
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);
|
|
}
|
|
}
|
|
|
|
/// ActOnEndOfTranslationUnit - This is called at the very end of the
|
|
/// translation unit when EOF is reached and all but the top-level scope is
|
|
/// popped.
|
|
void Sema::ActOnEndOfTranslationUnit() {
|
|
assert(DelayedDiagnostics.getCurrentPool() == nullptr
|
|
&& "reached end of translation unit with a pool attached?");
|
|
|
|
// If code completion is enabled, don't perform any end-of-translation-unit
|
|
// work.
|
|
if (PP.isCodeCompletionEnabled())
|
|
return;
|
|
|
|
// Transfer late parsed template instantiations over to the pending template
|
|
// instantiation list. During normal compliation, the late template parser
|
|
// will be installed and instantiating these templates will succeed.
|
|
//
|
|
// If we are building a TU prefix for serialization, it is also safe to
|
|
// transfer these over, even though they are not parsed. The end of the TU
|
|
// should be outside of any eager template instantiation scope, so when this
|
|
// AST is deserialized, these templates will not be parsed until the end of
|
|
// the combined TU.
|
|
PendingInstantiations.insert(PendingInstantiations.end(),
|
|
LateParsedInstantiations.begin(),
|
|
LateParsedInstantiations.end());
|
|
LateParsedInstantiations.clear();
|
|
|
|
// Complete translation units and modules define vtables and perform implicit
|
|
// instantiations. PCH files do not.
|
|
if (TUKind != TU_Prefix) {
|
|
DiagnoseUseOfUnimplementedSelectors();
|
|
|
|
// If DefinedUsedVTables ends up marking any virtual member functions it
|
|
// might lead to more pending template instantiations, which we then need
|
|
// to instantiate.
|
|
DefineUsedVTables();
|
|
|
|
// C++: Perform implicit template instantiations.
|
|
//
|
|
// FIXME: When we perform these implicit instantiations, we do not
|
|
// carefully keep track of the point of instantiation (C++ [temp.point]).
|
|
// This means that name lookup that occurs within the template
|
|
// instantiation will always happen at the end of the translation unit,
|
|
// so it will find some names that are not required to be found. This is
|
|
// valid, but we could do better by diagnosing if an instantiation uses a
|
|
// name that was not visible at its first point of instantiation.
|
|
if (ExternalSource) {
|
|
// Load pending instantiations from the external source.
|
|
SmallVector<PendingImplicitInstantiation, 4> Pending;
|
|
ExternalSource->ReadPendingInstantiations(Pending);
|
|
for (auto PII : Pending)
|
|
if (auto Func = dyn_cast<FunctionDecl>(PII.first))
|
|
Func->setInstantiationIsPending(true);
|
|
PendingInstantiations.insert(PendingInstantiations.begin(),
|
|
Pending.begin(), Pending.end());
|
|
}
|
|
|
|
PerformPendingInstantiations();
|
|
|
|
assert(LateParsedInstantiations.empty() &&
|
|
"end of TU template instantiation should not create more "
|
|
"late-parsed templates");
|
|
|
|
if (LateTemplateParserCleanup)
|
|
LateTemplateParserCleanup(OpaqueParser);
|
|
|
|
CheckDelayedMemberExceptionSpecs();
|
|
}
|
|
|
|
DiagnoseUnterminatedPragmaPack();
|
|
DiagnoseUnterminatedPragmaAttribute();
|
|
|
|
// All delayed member exception specs should be checked or we end up accepting
|
|
// incompatible declarations.
|
|
// FIXME: This is wrong for TUKind == TU_Prefix. In that case, we need to
|
|
// write out the lists to the AST file (if any).
|
|
assert(DelayedDefaultedMemberExceptionSpecs.empty());
|
|
assert(DelayedExceptionSpecChecks.empty());
|
|
|
|
// All dllexport classes should have been processed already.
|
|
assert(DelayedDllExportClasses.empty());
|
|
|
|
// Remove file scoped decls that turned out to be used.
|
|
UnusedFileScopedDecls.erase(
|
|
std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
|
|
UnusedFileScopedDecls.end(),
|
|
[this](const DeclaratorDecl *DD) {
|
|
return ShouldRemoveFromUnused(this, DD);
|
|
}),
|
|
UnusedFileScopedDecls.end());
|
|
|
|
if (TUKind == TU_Prefix) {
|
|
// Translation unit prefixes don't need any of the checking below.
|
|
if (!PP.isIncrementalProcessingEnabled())
|
|
TUScope = nullptr;
|
|
return;
|
|
}
|
|
|
|
// Check for #pragma weak identifiers that were never declared
|
|
LoadExternalWeakUndeclaredIdentifiers();
|
|
for (auto WeakID : WeakUndeclaredIdentifiers) {
|
|
if (WeakID.second.getUsed())
|
|
continue;
|
|
|
|
Decl *PrevDecl = LookupSingleName(TUScope, WeakID.first, SourceLocation(),
|
|
LookupOrdinaryName);
|
|
if (PrevDecl != nullptr &&
|
|
!(isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)))
|
|
Diag(WeakID.second.getLocation(), diag::warn_attribute_wrong_decl_type)
|
|
<< "'weak'" << ExpectedVariableOrFunction;
|
|
else
|
|
Diag(WeakID.second.getLocation(), diag::warn_weak_identifier_undeclared)
|
|
<< WeakID.first;
|
|
}
|
|
|
|
if (LangOpts.CPlusPlus11 &&
|
|
!Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
|
|
CheckDelegatingCtorCycles();
|
|
|
|
if (!Diags.hasErrorOccurred()) {
|
|
if (ExternalSource)
|
|
ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
|
|
checkUndefinedButUsed(*this);
|
|
}
|
|
|
|
if (TUKind == TU_Module) {
|
|
// If we are building a module interface unit, we need to have seen the
|
|
// module declaration by now.
|
|
if (getLangOpts().getCompilingModule() ==
|
|
LangOptions::CMK_ModuleInterface &&
|
|
ModuleScopes.back().Module->Kind != Module::ModuleInterfaceUnit) {
|
|
// FIXME: Make a better guess as to where to put the module declaration.
|
|
Diag(getSourceManager().getLocForStartOfFile(
|
|
getSourceManager().getMainFileID()),
|
|
diag::err_module_declaration_missing);
|
|
}
|
|
|
|
// If we are building a module, resolve all of the exported declarations
|
|
// now.
|
|
if (Module *CurrentModule = PP.getCurrentModule()) {
|
|
ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
|
|
|
|
SmallVector<Module *, 2> Stack;
|
|
Stack.push_back(CurrentModule);
|
|
while (!Stack.empty()) {
|
|
Module *Mod = Stack.pop_back_val();
|
|
|
|
// Resolve the exported declarations and conflicts.
|
|
// FIXME: Actually complain, once we figure out how to teach the
|
|
// diagnostic client to deal with complaints in the module map at this
|
|
// point.
|
|
ModMap.resolveExports(Mod, /*Complain=*/false);
|
|
ModMap.resolveUses(Mod, /*Complain=*/false);
|
|
ModMap.resolveConflicts(Mod, /*Complain=*/false);
|
|
|
|
// Queue the submodules, so their exports will also be resolved.
|
|
Stack.append(Mod->submodule_begin(), Mod->submodule_end());
|
|
}
|
|
}
|
|
|
|
// Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
|
|
// modules when they are built, not every time they are used.
|
|
emitAndClearUnusedLocalTypedefWarnings();
|
|
}
|
|
|
|
// C99 6.9.2p2:
|
|
// A declaration of an identifier for an object that has file
|
|
// scope without an initializer, and without a storage-class
|
|
// specifier or with the storage-class specifier static,
|
|
// constitutes a tentative definition. If a translation unit
|
|
// contains one or more tentative definitions for an identifier,
|
|
// and the translation unit contains no external definition for
|
|
// that identifier, then the behavior is exactly as if the
|
|
// translation unit contains a file scope declaration of that
|
|
// identifier, with the composite type as of the end of the
|
|
// translation unit, with an initializer equal to 0.
|
|
llvm::SmallSet<VarDecl *, 32> Seen;
|
|
for (TentativeDefinitionsType::iterator
|
|
T = TentativeDefinitions.begin(ExternalSource),
|
|
TEnd = TentativeDefinitions.end();
|
|
T != TEnd; ++T) {
|
|
VarDecl *VD = (*T)->getActingDefinition();
|
|
|
|
// If the tentative definition was completed, getActingDefinition() returns
|
|
// null. If we've already seen this variable before, insert()'s second
|
|
// return value is false.
|
|
if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
|
|
continue;
|
|
|
|
if (const IncompleteArrayType *ArrayT
|
|
= Context.getAsIncompleteArrayType(VD->getType())) {
|
|
// Set the length of the array to 1 (C99 6.9.2p5).
|
|
Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
|
|
llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
|
|
QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
|
|
One, ArrayType::Normal, 0);
|
|
VD->setType(T);
|
|
} else if (RequireCompleteType(VD->getLocation(), VD->getType(),
|
|
diag::err_tentative_def_incomplete_type))
|
|
VD->setInvalidDecl();
|
|
|
|
// No initialization is performed for a tentative definition.
|
|
CheckCompleteVariableDeclaration(VD);
|
|
|
|
// Notify the consumer that we've completed a tentative definition.
|
|
if (!VD->isInvalidDecl())
|
|
Consumer.CompleteTentativeDefinition(VD);
|
|
}
|
|
|
|
// If there were errors, disable 'unused' warnings since they will mostly be
|
|
// noise. Don't warn for a use from a module: either we should warn on all
|
|
// file-scope declarations in modules or not at all, but whether the
|
|
// declaration is used is immaterial.
|
|
if (!Diags.hasErrorOccurred() && TUKind != TU_Module) {
|
|
// Output warning for unused file scoped decls.
|
|
for (UnusedFileScopedDeclsType::iterator
|
|
I = UnusedFileScopedDecls.begin(ExternalSource),
|
|
E = UnusedFileScopedDecls.end(); I != E; ++I) {
|
|
if (ShouldRemoveFromUnused(this, *I))
|
|
continue;
|
|
|
|
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
|
|
const FunctionDecl *DiagD;
|
|
if (!FD->hasBody(DiagD))
|
|
DiagD = FD;
|
|
if (DiagD->isDeleted())
|
|
continue; // Deleted functions are supposed to be unused.
|
|
if (DiagD->isReferenced()) {
|
|
if (isa<CXXMethodDecl>(DiagD))
|
|
Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
|
|
<< DiagD->getDeclName();
|
|
else {
|
|
if (FD->getStorageClass() == SC_Static &&
|
|
!FD->isInlineSpecified() &&
|
|
!SourceMgr.isInMainFile(
|
|
SourceMgr.getExpansionLoc(FD->getLocation())))
|
|
Diag(DiagD->getLocation(),
|
|
diag::warn_unneeded_static_internal_decl)
|
|
<< DiagD->getDeclName();
|
|
else
|
|
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
|
|
<< /*function*/0 << DiagD->getDeclName();
|
|
}
|
|
} else {
|
|
if (FD->getDescribedFunctionTemplate())
|
|
Diag(DiagD->getLocation(), diag::warn_unused_template)
|
|
<< /*function*/0 << DiagD->getDeclName();
|
|
else
|
|
Diag(DiagD->getLocation(),
|
|
isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
|
|
: diag::warn_unused_function)
|
|
<< DiagD->getDeclName();
|
|
}
|
|
} else {
|
|
const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
|
|
if (!DiagD)
|
|
DiagD = cast<VarDecl>(*I);
|
|
if (DiagD->isReferenced()) {
|
|
Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
|
|
<< /*variable*/1 << DiagD->getDeclName();
|
|
} else if (DiagD->getType().isConstQualified()) {
|
|
const SourceManager &SM = SourceMgr;
|
|
if (SM.getMainFileID() != SM.getFileID(DiagD->getLocation()) ||
|
|
!PP.getLangOpts().IsHeaderFile)
|
|
Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
|
|
<< DiagD->getDeclName();
|
|
} else {
|
|
if (DiagD->getDescribedVarTemplate())
|
|
Diag(DiagD->getLocation(), diag::warn_unused_template)
|
|
<< /*variable*/1 << DiagD->getDeclName();
|
|
else
|
|
Diag(DiagD->getLocation(), diag::warn_unused_variable)
|
|
<< DiagD->getDeclName();
|
|
}
|
|
}
|
|
}
|
|
|
|
emitAndClearUnusedLocalTypedefWarnings();
|
|
}
|
|
|
|
if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
|
|
// FIXME: Load additional unused private field candidates from the external
|
|
// source.
|
|
RecordCompleteMap RecordsComplete;
|
|
RecordCompleteMap MNCComplete;
|
|
for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
|
|
E = UnusedPrivateFields.end(); I != E; ++I) {
|
|
const NamedDecl *D = *I;
|
|
const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
|
|
if (RD && !RD->isUnion() &&
|
|
IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
|
|
Diag(D->getLocation(), diag::warn_unused_private_field)
|
|
<< D->getDeclName();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!Diags.isIgnored(diag::warn_mismatched_delete_new, SourceLocation())) {
|
|
if (ExternalSource)
|
|
ExternalSource->ReadMismatchingDeleteExpressions(DeleteExprs);
|
|
for (const auto &DeletedFieldInfo : DeleteExprs) {
|
|
for (const auto &DeleteExprLoc : DeletedFieldInfo.second) {
|
|
AnalyzeDeleteExprMismatch(DeletedFieldInfo.first, DeleteExprLoc.first,
|
|
DeleteExprLoc.second);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check we've noticed that we're no longer parsing the initializer for every
|
|
// variable. If we miss cases, then at best we have a performance issue and
|
|
// at worst a rejects-valid bug.
|
|
assert(ParsingInitForAutoVars.empty() &&
|
|
"Didn't unmark var as having its initializer parsed");
|
|
|
|
if (!PP.isIncrementalProcessingEnabled())
|
|
TUScope = nullptr;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Helper functions.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
DeclContext *Sema::getFunctionLevelDeclContext() {
|
|
DeclContext *DC = CurContext;
|
|
|
|
while (true) {
|
|
if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
|
|
DC = DC->getParent();
|
|
} else if (isa<CXXMethodDecl>(DC) &&
|
|
cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
|
|
cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
|
|
DC = DC->getParent()->getParent();
|
|
}
|
|
else break;
|
|
}
|
|
|
|
return DC;
|
|
}
|
|
|
|
/// getCurFunctionDecl - If inside of a function body, this returns a pointer
|
|
/// to the function decl for the function being parsed. If we're currently
|
|
/// in a 'block', this returns the containing context.
|
|
FunctionDecl *Sema::getCurFunctionDecl() {
|
|
DeclContext *DC = getFunctionLevelDeclContext();
|
|
return dyn_cast<FunctionDecl>(DC);
|
|
}
|
|
|
|
ObjCMethodDecl *Sema::getCurMethodDecl() {
|
|
DeclContext *DC = getFunctionLevelDeclContext();
|
|
while (isa<RecordDecl>(DC))
|
|
DC = DC->getParent();
|
|
return dyn_cast<ObjCMethodDecl>(DC);
|
|
}
|
|
|
|
NamedDecl *Sema::getCurFunctionOrMethodDecl() {
|
|
DeclContext *DC = getFunctionLevelDeclContext();
|
|
if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
|
|
return cast<NamedDecl>(DC);
|
|
return nullptr;
|
|
}
|
|
|
|
void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
|
|
// FIXME: It doesn't make sense to me that DiagID is an incoming argument here
|
|
// and yet we also use the current diag ID on the DiagnosticsEngine. This has
|
|
// been made more painfully obvious by the refactor that introduced this
|
|
// function, but it is possible that the incoming argument can be
|
|
// eliminated. If it truly cannot be (for example, there is some reentrancy
|
|
// issue I am not seeing yet), then there should at least be a clarifying
|
|
// comment somewhere.
|
|
if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
|
|
switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
|
|
Diags.getCurrentDiagID())) {
|
|
case DiagnosticIDs::SFINAE_Report:
|
|
// We'll report the diagnostic below.
|
|
break;
|
|
|
|
case DiagnosticIDs::SFINAE_SubstitutionFailure:
|
|
// Count this failure so that we know that template argument deduction
|
|
// has failed.
|
|
++NumSFINAEErrors;
|
|
|
|
// Make a copy of this suppressed diagnostic and store it with the
|
|
// template-deduction information.
|
|
if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
|
|
Diagnostic DiagInfo(&Diags);
|
|
(*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
|
|
PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
|
|
}
|
|
|
|
Diags.setLastDiagnosticIgnored();
|
|
Diags.Clear();
|
|
return;
|
|
|
|
case DiagnosticIDs::SFINAE_AccessControl: {
|
|
// Per C++ Core Issue 1170, access control is part of SFINAE.
|
|
// Additionally, the AccessCheckingSFINAE flag can be used to temporarily
|
|
// make access control a part of SFINAE for the purposes of checking
|
|
// type traits.
|
|
if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
|
|
break;
|
|
|
|
SourceLocation Loc = Diags.getCurrentDiagLoc();
|
|
|
|
// Suppress this diagnostic.
|
|
++NumSFINAEErrors;
|
|
|
|
// Make a copy of this suppressed diagnostic and store it with the
|
|
// template-deduction information.
|
|
if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
|
|
Diagnostic DiagInfo(&Diags);
|
|
(*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
|
|
PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
|
|
}
|
|
|
|
Diags.setLastDiagnosticIgnored();
|
|
Diags.Clear();
|
|
|
|
// Now the diagnostic state is clear, produce a C++98 compatibility
|
|
// warning.
|
|
Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
|
|
|
|
// The last diagnostic which Sema produced was ignored. Suppress any
|
|
// notes attached to it.
|
|
Diags.setLastDiagnosticIgnored();
|
|
return;
|
|
}
|
|
|
|
case DiagnosticIDs::SFINAE_Suppress:
|
|
// Make a copy of this suppressed diagnostic and store it with the
|
|
// template-deduction information;
|
|
if (*Info) {
|
|
Diagnostic DiagInfo(&Diags);
|
|
(*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
|
|
PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
|
|
}
|
|
|
|
// Suppress this diagnostic.
|
|
Diags.setLastDiagnosticIgnored();
|
|
Diags.Clear();
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Copy the diagnostic printing policy over the ASTContext printing policy.
|
|
// TODO: Stop doing that. See: https://reviews.llvm.org/D45093#1090292
|
|
Context.setPrintingPolicy(getPrintingPolicy());
|
|
|
|
// Emit the diagnostic.
|
|
if (!Diags.EmitCurrentDiagnostic())
|
|
return;
|
|
|
|
// If this is not a note, and we're in a template instantiation
|
|
// that is different from the last template instantiation where
|
|
// we emitted an error, print a template instantiation
|
|
// backtrace.
|
|
if (!DiagnosticIDs::isBuiltinNote(DiagID))
|
|
PrintContextStack();
|
|
}
|
|
|
|
Sema::SemaDiagnosticBuilder
|
|
Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
|
|
SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
|
|
PD.Emit(Builder);
|
|
|
|
return Builder;
|
|
}
|
|
|
|
/// Looks through the macro-expansion chain for the given
|
|
/// location, looking for a macro expansion with the given name.
|
|
/// If one is found, returns true and sets the location to that
|
|
/// expansion loc.
|
|
bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
|
|
SourceLocation loc = locref;
|
|
if (!loc.isMacroID()) return false;
|
|
|
|
// There's no good way right now to look at the intermediate
|
|
// expansions, so just jump to the expansion location.
|
|
loc = getSourceManager().getExpansionLoc(loc);
|
|
|
|
// If that's written with the name, stop here.
|
|
SmallVector<char, 16> buffer;
|
|
if (getPreprocessor().getSpelling(loc, buffer) == name) {
|
|
locref = loc;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Determines the active Scope associated with the given declaration
|
|
/// context.
|
|
///
|
|
/// This routine maps a declaration context to the active Scope object that
|
|
/// represents that declaration context in the parser. It is typically used
|
|
/// from "scope-less" code (e.g., template instantiation, lazy creation of
|
|
/// declarations) that injects a name for name-lookup purposes and, therefore,
|
|
/// must update the Scope.
|
|
///
|
|
/// \returns The scope corresponding to the given declaraion context, or NULL
|
|
/// if no such scope is open.
|
|
Scope *Sema::getScopeForContext(DeclContext *Ctx) {
|
|
|
|
if (!Ctx)
|
|
return nullptr;
|
|
|
|
Ctx = Ctx->getPrimaryContext();
|
|
for (Scope *S = getCurScope(); S; S = S->getParent()) {
|
|
// Ignore scopes that cannot have declarations. This is important for
|
|
// out-of-line definitions of static class members.
|
|
if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
|
|
if (DeclContext *Entity = S->getEntity())
|
|
if (Ctx == Entity->getPrimaryContext())
|
|
return S;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/// Enter a new function scope
|
|
void Sema::PushFunctionScope() {
|
|
if (FunctionScopes.empty()) {
|
|
// Use PreallocatedFunctionScope to avoid allocating memory when possible.
|
|
PreallocatedFunctionScope->Clear();
|
|
FunctionScopes.push_back(PreallocatedFunctionScope.get());
|
|
} else {
|
|
FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
|
|
}
|
|
if (LangOpts.OpenMP)
|
|
pushOpenMPFunctionRegion();
|
|
}
|
|
|
|
void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
|
|
FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
|
|
BlockScope, Block));
|
|
}
|
|
|
|
LambdaScopeInfo *Sema::PushLambdaScope() {
|
|
LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
|
|
FunctionScopes.push_back(LSI);
|
|
return LSI;
|
|
}
|
|
|
|
void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
|
|
if (LambdaScopeInfo *const LSI = getCurLambda()) {
|
|
LSI->AutoTemplateParameterDepth = Depth;
|
|
return;
|
|
}
|
|
llvm_unreachable(
|
|
"Remove assertion if intentionally called in a non-lambda context.");
|
|
}
|
|
|
|
void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
|
|
const Decl *D, const BlockExpr *blkExpr) {
|
|
assert(!FunctionScopes.empty() && "mismatched push/pop!");
|
|
FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
|
|
|
|
if (LangOpts.OpenMP)
|
|
popOpenMPFunctionRegion(Scope);
|
|
|
|
// Issue any analysis-based warnings.
|
|
if (WP && D)
|
|
AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
|
|
else
|
|
for (const auto &PUD : Scope->PossiblyUnreachableDiags)
|
|
Diag(PUD.Loc, PUD.PD);
|
|
|
|
// Delete the scope unless its our preallocated scope.
|
|
if (Scope != PreallocatedFunctionScope.get())
|
|
delete Scope;
|
|
}
|
|
|
|
void Sema::PushCompoundScope(bool IsStmtExpr) {
|
|
getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo(IsStmtExpr));
|
|
}
|
|
|
|
void Sema::PopCompoundScope() {
|
|
FunctionScopeInfo *CurFunction = getCurFunction();
|
|
assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
|
|
|
|
CurFunction->CompoundScopes.pop_back();
|
|
}
|
|
|
|
/// Determine whether any errors occurred within this function/method/
|
|
/// block.
|
|
bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
|
|
return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
|
|
}
|
|
|
|
void Sema::setFunctionHasBranchIntoScope() {
|
|
if (!FunctionScopes.empty())
|
|
FunctionScopes.back()->setHasBranchIntoScope();
|
|
}
|
|
|
|
void Sema::setFunctionHasBranchProtectedScope() {
|
|
if (!FunctionScopes.empty())
|
|
FunctionScopes.back()->setHasBranchProtectedScope();
|
|
}
|
|
|
|
void Sema::setFunctionHasIndirectGoto() {
|
|
if (!FunctionScopes.empty())
|
|
FunctionScopes.back()->setHasIndirectGoto();
|
|
}
|
|
|
|
BlockScopeInfo *Sema::getCurBlock() {
|
|
if (FunctionScopes.empty())
|
|
return nullptr;
|
|
|
|
auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
|
|
if (CurBSI && CurBSI->TheDecl &&
|
|
!CurBSI->TheDecl->Encloses(CurContext)) {
|
|
// We have switched contexts due to template instantiation.
|
|
assert(!CodeSynthesisContexts.empty());
|
|
return nullptr;
|
|
}
|
|
|
|
return CurBSI;
|
|
}
|
|
|
|
FunctionScopeInfo *Sema::getEnclosingFunction() const {
|
|
if (FunctionScopes.empty())
|
|
return nullptr;
|
|
|
|
for (int e = FunctionScopes.size() - 1; e >= 0; --e) {
|
|
if (isa<sema::BlockScopeInfo>(FunctionScopes[e]))
|
|
continue;
|
|
return FunctionScopes[e];
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
LambdaScopeInfo *Sema::getCurLambda(bool IgnoreNonLambdaCapturingScope) {
|
|
if (FunctionScopes.empty())
|
|
return nullptr;
|
|
|
|
auto I = FunctionScopes.rbegin();
|
|
if (IgnoreNonLambdaCapturingScope) {
|
|
auto E = FunctionScopes.rend();
|
|
while (I != E && isa<CapturingScopeInfo>(*I) && !isa<LambdaScopeInfo>(*I))
|
|
++I;
|
|
if (I == E)
|
|
return nullptr;
|
|
}
|
|
auto *CurLSI = dyn_cast<LambdaScopeInfo>(*I);
|
|
if (CurLSI && CurLSI->Lambda &&
|
|
!CurLSI->Lambda->Encloses(CurContext)) {
|
|
// We have switched contexts due to template instantiation.
|
|
assert(!CodeSynthesisContexts.empty());
|
|
return nullptr;
|
|
}
|
|
|
|
return CurLSI;
|
|
}
|
|
// We have a generic lambda if we parsed auto parameters, or we have
|
|
// an associated template parameter list.
|
|
LambdaScopeInfo *Sema::getCurGenericLambda() {
|
|
if (LambdaScopeInfo *LSI = getCurLambda()) {
|
|
return (LSI->AutoTemplateParams.size() ||
|
|
LSI->GLTemplateParameterList) ? LSI : nullptr;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
|
|
void Sema::ActOnComment(SourceRange Comment) {
|
|
if (!LangOpts.RetainCommentsFromSystemHeaders &&
|
|
SourceMgr.isInSystemHeader(Comment.getBegin()))
|
|
return;
|
|
RawComment RC(SourceMgr, Comment, LangOpts.CommentOpts, false);
|
|
if (RC.isAlmostTrailingComment()) {
|
|
SourceRange MagicMarkerRange(Comment.getBegin(),
|
|
Comment.getBegin().getLocWithOffset(3));
|
|
StringRef MagicMarkerText;
|
|
switch (RC.getKind()) {
|
|
case RawComment::RCK_OrdinaryBCPL:
|
|
MagicMarkerText = "///<";
|
|
break;
|
|
case RawComment::RCK_OrdinaryC:
|
|
MagicMarkerText = "/**<";
|
|
break;
|
|
default:
|
|
llvm_unreachable("if this is an almost Doxygen comment, "
|
|
"it should be ordinary");
|
|
}
|
|
Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
|
|
FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
|
|
}
|
|
Context.addComment(RC);
|
|
}
|
|
|
|
// Pin this vtable to this file.
|
|
ExternalSemaSource::~ExternalSemaSource() {}
|
|
|
|
void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
|
|
void ExternalSemaSource::updateOutOfDateSelector(Selector Sel) { }
|
|
|
|
void ExternalSemaSource::ReadKnownNamespaces(
|
|
SmallVectorImpl<NamespaceDecl *> &Namespaces) {
|
|
}
|
|
|
|
void ExternalSemaSource::ReadUndefinedButUsed(
|
|
llvm::MapVector<NamedDecl *, SourceLocation> &Undefined) {}
|
|
|
|
void ExternalSemaSource::ReadMismatchingDeleteExpressions(llvm::MapVector<
|
|
FieldDecl *, llvm::SmallVector<std::pair<SourceLocation, bool>, 4>> &) {}
|
|
|
|
/// Figure out if an expression could be turned into a call.
|
|
///
|
|
/// Use this when trying to recover from an error where the programmer may have
|
|
/// written just the name of a function instead of actually calling it.
|
|
///
|
|
/// \param E - The expression to examine.
|
|
/// \param ZeroArgCallReturnTy - If the expression can be turned into a call
|
|
/// with no arguments, this parameter is set to the type returned by such a
|
|
/// call; otherwise, it is set to an empty QualType.
|
|
/// \param OverloadSet - If the expression is an overloaded function
|
|
/// name, this parameter is populated with the decls of the various overloads.
|
|
bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
|
|
UnresolvedSetImpl &OverloadSet) {
|
|
ZeroArgCallReturnTy = QualType();
|
|
OverloadSet.clear();
|
|
|
|
const OverloadExpr *Overloads = nullptr;
|
|
bool IsMemExpr = false;
|
|
if (E.getType() == Context.OverloadTy) {
|
|
OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
|
|
|
|
// Ignore overloads that are pointer-to-member constants.
|
|
if (FR.HasFormOfMemberPointer)
|
|
return false;
|
|
|
|
Overloads = FR.Expression;
|
|
} else if (E.getType() == Context.BoundMemberTy) {
|
|
Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
|
|
IsMemExpr = true;
|
|
}
|
|
|
|
bool Ambiguous = false;
|
|
bool IsMV = false;
|
|
|
|
if (Overloads) {
|
|
for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
|
|
DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
|
|
OverloadSet.addDecl(*it);
|
|
|
|
// Check whether the function is a non-template, non-member which takes no
|
|
// arguments.
|
|
if (IsMemExpr)
|
|
continue;
|
|
if (const FunctionDecl *OverloadDecl
|
|
= dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
|
|
if (OverloadDecl->getMinRequiredArguments() == 0) {
|
|
if (!ZeroArgCallReturnTy.isNull() && !Ambiguous &&
|
|
(!IsMV || !(OverloadDecl->isCPUDispatchMultiVersion() ||
|
|
OverloadDecl->isCPUSpecificMultiVersion()))) {
|
|
ZeroArgCallReturnTy = QualType();
|
|
Ambiguous = true;
|
|
} else {
|
|
ZeroArgCallReturnTy = OverloadDecl->getReturnType();
|
|
IsMV = OverloadDecl->isCPUDispatchMultiVersion() ||
|
|
OverloadDecl->isCPUSpecificMultiVersion();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If it's not a member, use better machinery to try to resolve the call
|
|
if (!IsMemExpr)
|
|
return !ZeroArgCallReturnTy.isNull();
|
|
}
|
|
|
|
// Attempt to call the member with no arguments - this will correctly handle
|
|
// member templates with defaults/deduction of template arguments, overloads
|
|
// with default arguments, etc.
|
|
if (IsMemExpr && !E.isTypeDependent()) {
|
|
bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
|
|
getDiagnostics().setSuppressAllDiagnostics(true);
|
|
ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
|
|
None, SourceLocation());
|
|
getDiagnostics().setSuppressAllDiagnostics(Suppress);
|
|
if (R.isUsable()) {
|
|
ZeroArgCallReturnTy = R.get()->getType();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
|
|
if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
|
|
if (Fun->getMinRequiredArguments() == 0)
|
|
ZeroArgCallReturnTy = Fun->getReturnType();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// We don't have an expression that's convenient to get a FunctionDecl from,
|
|
// but we can at least check if the type is "function of 0 arguments".
|
|
QualType ExprTy = E.getType();
|
|
const FunctionType *FunTy = nullptr;
|
|
QualType PointeeTy = ExprTy->getPointeeType();
|
|
if (!PointeeTy.isNull())
|
|
FunTy = PointeeTy->getAs<FunctionType>();
|
|
if (!FunTy)
|
|
FunTy = ExprTy->getAs<FunctionType>();
|
|
|
|
if (const FunctionProtoType *FPT =
|
|
dyn_cast_or_null<FunctionProtoType>(FunTy)) {
|
|
if (FPT->getNumParams() == 0)
|
|
ZeroArgCallReturnTy = FunTy->getReturnType();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Give notes for a set of overloads.
|
|
///
|
|
/// A companion to tryExprAsCall. In cases when the name that the programmer
|
|
/// wrote was an overloaded function, we may be able to make some guesses about
|
|
/// plausible overloads based on their return types; such guesses can be handed
|
|
/// off to this method to be emitted as notes.
|
|
///
|
|
/// \param Overloads - The overloads to note.
|
|
/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
|
|
/// -fshow-overloads=best, this is the location to attach to the note about too
|
|
/// many candidates. Typically this will be the location of the original
|
|
/// ill-formed expression.
|
|
static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
|
|
const SourceLocation FinalNoteLoc) {
|
|
int ShownOverloads = 0;
|
|
int SuppressedOverloads = 0;
|
|
for (UnresolvedSetImpl::iterator It = Overloads.begin(),
|
|
DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
|
|
// FIXME: Magic number for max shown overloads stolen from
|
|
// OverloadCandidateSet::NoteCandidates.
|
|
if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
|
|
++SuppressedOverloads;
|
|
continue;
|
|
}
|
|
|
|
NamedDecl *Fn = (*It)->getUnderlyingDecl();
|
|
// Don't print overloads for non-default multiversioned functions.
|
|
if (const auto *FD = Fn->getAsFunction()) {
|
|
if (FD->isMultiVersion() && FD->hasAttr<TargetAttr>() &&
|
|
!FD->getAttr<TargetAttr>()->isDefaultVersion())
|
|
continue;
|
|
}
|
|
S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
|
|
++ShownOverloads;
|
|
}
|
|
|
|
if (SuppressedOverloads)
|
|
S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
|
|
<< SuppressedOverloads;
|
|
}
|
|
|
|
static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
|
|
const UnresolvedSetImpl &Overloads,
|
|
bool (*IsPlausibleResult)(QualType)) {
|
|
if (!IsPlausibleResult)
|
|
return noteOverloads(S, Overloads, Loc);
|
|
|
|
UnresolvedSet<2> PlausibleOverloads;
|
|
for (OverloadExpr::decls_iterator It = Overloads.begin(),
|
|
DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
|
|
const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
|
|
QualType OverloadResultTy = OverloadDecl->getReturnType();
|
|
if (IsPlausibleResult(OverloadResultTy))
|
|
PlausibleOverloads.addDecl(It.getDecl());
|
|
}
|
|
noteOverloads(S, PlausibleOverloads, Loc);
|
|
}
|
|
|
|
/// Determine whether the given expression can be called by just
|
|
/// putting parentheses after it. Notably, expressions with unary
|
|
/// operators can't be because the unary operator will start parsing
|
|
/// outside the call.
|
|
static bool IsCallableWithAppend(Expr *E) {
|
|
E = E->IgnoreImplicit();
|
|
return (!isa<CStyleCastExpr>(E) &&
|
|
!isa<UnaryOperator>(E) &&
|
|
!isa<BinaryOperator>(E) &&
|
|
!isa<CXXOperatorCallExpr>(E));
|
|
}
|
|
|
|
static bool IsCPUDispatchCPUSpecificMultiVersion(const Expr *E) {
|
|
if (const auto *UO = dyn_cast<UnaryOperator>(E))
|
|
E = UO->getSubExpr();
|
|
|
|
if (const auto *ULE = dyn_cast<UnresolvedLookupExpr>(E)) {
|
|
if (ULE->getNumDecls() == 0)
|
|
return false;
|
|
|
|
const NamedDecl *ND = *ULE->decls_begin();
|
|
if (const auto *FD = dyn_cast<FunctionDecl>(ND))
|
|
return FD->isCPUDispatchMultiVersion() || FD->isCPUSpecificMultiVersion();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
|
|
bool ForceComplain,
|
|
bool (*IsPlausibleResult)(QualType)) {
|
|
SourceLocation Loc = E.get()->getExprLoc();
|
|
SourceRange Range = E.get()->getSourceRange();
|
|
|
|
QualType ZeroArgCallTy;
|
|
UnresolvedSet<4> Overloads;
|
|
if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
|
|
!ZeroArgCallTy.isNull() &&
|
|
(!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
|
|
// At this point, we know E is potentially callable with 0
|
|
// arguments and that it returns something of a reasonable type,
|
|
// so we can emit a fixit and carry on pretending that E was
|
|
// actually a CallExpr.
|
|
SourceLocation ParenInsertionLoc = getLocForEndOfToken(Range.getEnd());
|
|
bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E.get());
|
|
Diag(Loc, PD) << /*zero-arg*/ 1 << IsMV << Range
|
|
<< (IsCallableWithAppend(E.get())
|
|
? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
|
|
: FixItHint());
|
|
if (!IsMV)
|
|
notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
|
|
|
|
// FIXME: Try this before emitting the fixit, and suppress diagnostics
|
|
// while doing so.
|
|
E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
|
|
Range.getEnd().getLocWithOffset(1));
|
|
return true;
|
|
}
|
|
|
|
if (!ForceComplain) return false;
|
|
|
|
bool IsMV = IsCPUDispatchCPUSpecificMultiVersion(E.get());
|
|
Diag(Loc, PD) << /*not zero-arg*/ 0 << IsMV << Range;
|
|
if (!IsMV)
|
|
notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
|
|
E = ExprError();
|
|
return true;
|
|
}
|
|
|
|
IdentifierInfo *Sema::getSuperIdentifier() const {
|
|
if (!Ident_super)
|
|
Ident_super = &Context.Idents.get("super");
|
|
return Ident_super;
|
|
}
|
|
|
|
IdentifierInfo *Sema::getFloat128Identifier() const {
|
|
if (!Ident___float128)
|
|
Ident___float128 = &Context.Idents.get("__float128");
|
|
return Ident___float128;
|
|
}
|
|
|
|
void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
|
|
CapturedRegionKind K) {
|
|
CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
|
|
getDiagnostics(), S, CD, RD, CD->getContextParam(), K,
|
|
(getLangOpts().OpenMP && K == CR_OpenMP) ? getOpenMPNestingLevel() : 0);
|
|
CSI->ReturnType = Context.VoidTy;
|
|
FunctionScopes.push_back(CSI);
|
|
}
|
|
|
|
CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
|
|
if (FunctionScopes.empty())
|
|
return nullptr;
|
|
|
|
return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
|
|
}
|
|
|
|
const llvm::MapVector<FieldDecl *, Sema::DeleteLocs> &
|
|
Sema::getMismatchingDeleteExpressions() const {
|
|
return DeleteExprs;
|
|
}
|
|
|
|
void Sema::setOpenCLExtensionForType(QualType T, llvm::StringRef ExtStr) {
|
|
if (ExtStr.empty())
|
|
return;
|
|
llvm::SmallVector<StringRef, 1> Exts;
|
|
ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
|
|
auto CanT = T.getCanonicalType().getTypePtr();
|
|
for (auto &I : Exts)
|
|
OpenCLTypeExtMap[CanT].insert(I.str());
|
|
}
|
|
|
|
void Sema::setOpenCLExtensionForDecl(Decl *FD, StringRef ExtStr) {
|
|
llvm::SmallVector<StringRef, 1> Exts;
|
|
ExtStr.split(Exts, " ", /* limit */ -1, /* keep empty */ false);
|
|
if (Exts.empty())
|
|
return;
|
|
for (auto &I : Exts)
|
|
OpenCLDeclExtMap[FD].insert(I.str());
|
|
}
|
|
|
|
void Sema::setCurrentOpenCLExtensionForType(QualType T) {
|
|
if (CurrOpenCLExtension.empty())
|
|
return;
|
|
setOpenCLExtensionForType(T, CurrOpenCLExtension);
|
|
}
|
|
|
|
void Sema::setCurrentOpenCLExtensionForDecl(Decl *D) {
|
|
if (CurrOpenCLExtension.empty())
|
|
return;
|
|
setOpenCLExtensionForDecl(D, CurrOpenCLExtension);
|
|
}
|
|
|
|
bool Sema::isOpenCLDisabledDecl(Decl *FD) {
|
|
auto Loc = OpenCLDeclExtMap.find(FD);
|
|
if (Loc == OpenCLDeclExtMap.end())
|
|
return false;
|
|
for (auto &I : Loc->second) {
|
|
if (!getOpenCLOptions().isEnabled(I))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template <typename T, typename DiagLocT, typename DiagInfoT, typename MapT>
|
|
bool Sema::checkOpenCLDisabledTypeOrDecl(T D, DiagLocT DiagLoc,
|
|
DiagInfoT DiagInfo, MapT &Map,
|
|
unsigned Selector,
|
|
SourceRange SrcRange) {
|
|
auto Loc = Map.find(D);
|
|
if (Loc == Map.end())
|
|
return false;
|
|
bool Disabled = false;
|
|
for (auto &I : Loc->second) {
|
|
if (I != CurrOpenCLExtension && !getOpenCLOptions().isEnabled(I)) {
|
|
Diag(DiagLoc, diag::err_opencl_requires_extension) << Selector << DiagInfo
|
|
<< I << SrcRange;
|
|
Disabled = true;
|
|
}
|
|
}
|
|
return Disabled;
|
|
}
|
|
|
|
bool Sema::checkOpenCLDisabledTypeDeclSpec(const DeclSpec &DS, QualType QT) {
|
|
// Check extensions for declared types.
|
|
Decl *Decl = nullptr;
|
|
if (auto TypedefT = dyn_cast<TypedefType>(QT.getTypePtr()))
|
|
Decl = TypedefT->getDecl();
|
|
if (auto TagT = dyn_cast<TagType>(QT.getCanonicalType().getTypePtr()))
|
|
Decl = TagT->getDecl();
|
|
auto Loc = DS.getTypeSpecTypeLoc();
|
|
if (checkOpenCLDisabledTypeOrDecl(Decl, Loc, QT, OpenCLDeclExtMap))
|
|
return true;
|
|
|
|
// Check extensions for builtin types.
|
|
return checkOpenCLDisabledTypeOrDecl(QT.getCanonicalType().getTypePtr(), Loc,
|
|
QT, OpenCLTypeExtMap);
|
|
}
|
|
|
|
bool Sema::checkOpenCLDisabledDecl(const NamedDecl &D, const Expr &E) {
|
|
IdentifierInfo *FnName = D.getIdentifier();
|
|
return checkOpenCLDisabledTypeOrDecl(&D, E.getLocStart(), FnName,
|
|
OpenCLDeclExtMap, 1, D.getSourceRange());
|
|
}
|