xref: /minix3/external/bsd/llvm/dist/clang/lib/Sema/Sema.cpp (revision 0a6a1f1d05b60e214de2f05a7310ddd1f0e590e7)
1f4a2713aSLionel Sambuc //===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
2f4a2713aSLionel Sambuc //
3f4a2713aSLionel Sambuc //                     The LLVM Compiler Infrastructure
4f4a2713aSLionel Sambuc //
5f4a2713aSLionel Sambuc // This file is distributed under the University of Illinois Open Source
6f4a2713aSLionel Sambuc // License. See LICENSE.TXT for details.
7f4a2713aSLionel Sambuc //
8f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
9f4a2713aSLionel Sambuc //
10f4a2713aSLionel Sambuc // This file implements the actions class which performs semantic analysis and
11f4a2713aSLionel Sambuc // builds an AST out of a parse stream.
12f4a2713aSLionel Sambuc //
13f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
14f4a2713aSLionel Sambuc 
15f4a2713aSLionel Sambuc #include "clang/Sema/SemaInternal.h"
16f4a2713aSLionel Sambuc #include "clang/AST/ASTContext.h"
17f4a2713aSLionel Sambuc #include "clang/AST/ASTDiagnostic.h"
18f4a2713aSLionel Sambuc #include "clang/AST/DeclCXX.h"
19f4a2713aSLionel Sambuc #include "clang/AST/DeclFriend.h"
20f4a2713aSLionel Sambuc #include "clang/AST/DeclObjC.h"
21f4a2713aSLionel Sambuc #include "clang/AST/Expr.h"
22f4a2713aSLionel Sambuc #include "clang/AST/ExprCXX.h"
23f4a2713aSLionel Sambuc #include "clang/AST/StmtCXX.h"
24*0a6a1f1dSLionel Sambuc #include "clang/Basic/DiagnosticOptions.h"
25f4a2713aSLionel Sambuc #include "clang/Basic/FileManager.h"
26f4a2713aSLionel Sambuc #include "clang/Basic/PartialDiagnostic.h"
27f4a2713aSLionel Sambuc #include "clang/Basic/TargetInfo.h"
28f4a2713aSLionel Sambuc #include "clang/Lex/HeaderSearch.h"
29f4a2713aSLionel Sambuc #include "clang/Lex/Preprocessor.h"
30f4a2713aSLionel Sambuc #include "clang/Sema/CXXFieldCollector.h"
31f4a2713aSLionel Sambuc #include "clang/Sema/DelayedDiagnostic.h"
32f4a2713aSLionel Sambuc #include "clang/Sema/ExternalSemaSource.h"
33f4a2713aSLionel Sambuc #include "clang/Sema/MultiplexExternalSemaSource.h"
34f4a2713aSLionel Sambuc #include "clang/Sema/ObjCMethodList.h"
35f4a2713aSLionel Sambuc #include "clang/Sema/PrettyDeclStackTrace.h"
36f4a2713aSLionel Sambuc #include "clang/Sema/Scope.h"
37f4a2713aSLionel Sambuc #include "clang/Sema/ScopeInfo.h"
38f4a2713aSLionel Sambuc #include "clang/Sema/SemaConsumer.h"
39f4a2713aSLionel Sambuc #include "clang/Sema/TemplateDeduction.h"
40f4a2713aSLionel Sambuc #include "llvm/ADT/APFloat.h"
41f4a2713aSLionel Sambuc #include "llvm/ADT/DenseMap.h"
42f4a2713aSLionel Sambuc #include "llvm/ADT/SmallSet.h"
43f4a2713aSLionel Sambuc #include "llvm/Support/CrashRecoveryContext.h"
44f4a2713aSLionel Sambuc using namespace clang;
45f4a2713aSLionel Sambuc using namespace sema;
46f4a2713aSLionel Sambuc 
getLocForEndOfToken(SourceLocation Loc,unsigned Offset)47*0a6a1f1dSLionel Sambuc SourceLocation Sema::getLocForEndOfToken(SourceLocation Loc, unsigned Offset) {
48*0a6a1f1dSLionel Sambuc   return Lexer::getLocForEndOfToken(Loc, Offset, SourceMgr, LangOpts);
49*0a6a1f1dSLionel Sambuc }
50*0a6a1f1dSLionel Sambuc 
getModuleLoader() const51*0a6a1f1dSLionel Sambuc ModuleLoader &Sema::getModuleLoader() const { return PP.getModuleLoader(); }
52*0a6a1f1dSLionel Sambuc 
getPrintingPolicy(const ASTContext & Context,const Preprocessor & PP)53f4a2713aSLionel Sambuc PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
54f4a2713aSLionel Sambuc                                        const Preprocessor &PP) {
55f4a2713aSLionel Sambuc   PrintingPolicy Policy = Context.getPrintingPolicy();
56f4a2713aSLionel Sambuc   Policy.Bool = Context.getLangOpts().Bool;
57f4a2713aSLionel Sambuc   if (!Policy.Bool) {
58f4a2713aSLionel Sambuc     if (const MacroInfo *
59f4a2713aSLionel Sambuc           BoolMacro = PP.getMacroInfo(&Context.Idents.get("bool"))) {
60f4a2713aSLionel Sambuc       Policy.Bool = BoolMacro->isObjectLike() &&
61f4a2713aSLionel Sambuc         BoolMacro->getNumTokens() == 1 &&
62f4a2713aSLionel Sambuc         BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
63f4a2713aSLionel Sambuc     }
64f4a2713aSLionel Sambuc   }
65f4a2713aSLionel Sambuc 
66f4a2713aSLionel Sambuc   return Policy;
67f4a2713aSLionel Sambuc }
68f4a2713aSLionel Sambuc 
ActOnTranslationUnitScope(Scope * S)69f4a2713aSLionel Sambuc void Sema::ActOnTranslationUnitScope(Scope *S) {
70f4a2713aSLionel Sambuc   TUScope = S;
71f4a2713aSLionel Sambuc   PushDeclContext(S, Context.getTranslationUnitDecl());
72f4a2713aSLionel Sambuc }
73f4a2713aSLionel Sambuc 
Sema(Preprocessor & pp,ASTContext & ctxt,ASTConsumer & consumer,TranslationUnitKind TUKind,CodeCompleteConsumer * CodeCompleter)74f4a2713aSLionel Sambuc Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
75f4a2713aSLionel Sambuc            TranslationUnitKind TUKind,
76f4a2713aSLionel Sambuc            CodeCompleteConsumer *CodeCompleter)
77*0a6a1f1dSLionel Sambuc   : ExternalSource(nullptr),
78f4a2713aSLionel Sambuc     isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
79f4a2713aSLionel Sambuc     LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
80f4a2713aSLionel Sambuc     Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
81f4a2713aSLionel Sambuc     CollectStats(false), CodeCompleter(CodeCompleter),
82*0a6a1f1dSLionel Sambuc     CurContext(nullptr), OriginalLexicalContext(nullptr),
83*0a6a1f1dSLionel Sambuc     PackContext(nullptr), MSStructPragmaOn(false),
84*0a6a1f1dSLionel Sambuc     MSPointerToMemberRepresentationMethod(
85*0a6a1f1dSLionel Sambuc         LangOpts.getMSPointerToMemberRepresentationMethod()),
86*0a6a1f1dSLionel Sambuc     VtorDispModeStack(1, MSVtorDispAttr::Mode(LangOpts.VtorDispMode)),
87*0a6a1f1dSLionel Sambuc     DataSegStack(nullptr), BSSSegStack(nullptr), ConstSegStack(nullptr),
88*0a6a1f1dSLionel Sambuc     CodeSegStack(nullptr), CurInitSeg(nullptr), VisContext(nullptr),
89f4a2713aSLionel Sambuc     IsBuildingRecoveryCallExpr(false),
90*0a6a1f1dSLionel Sambuc     ExprNeedsCleanups(false), LateTemplateParser(nullptr),
91*0a6a1f1dSLionel Sambuc     LateTemplateParserCleanup(nullptr),
92*0a6a1f1dSLionel Sambuc     OpaqueParser(nullptr), IdResolver(pp), StdInitializerList(nullptr),
93*0a6a1f1dSLionel Sambuc     CXXTypeInfoDecl(nullptr), MSVCGuidDecl(nullptr),
94*0a6a1f1dSLionel Sambuc     NSNumberDecl(nullptr),
95*0a6a1f1dSLionel Sambuc     NSStringDecl(nullptr), StringWithUTF8StringMethod(nullptr),
96*0a6a1f1dSLionel Sambuc     NSArrayDecl(nullptr), ArrayWithObjectsMethod(nullptr),
97*0a6a1f1dSLionel Sambuc     NSDictionaryDecl(nullptr), DictionaryWithObjectsMethod(nullptr),
98*0a6a1f1dSLionel Sambuc     MSAsmLabelNameCounter(0),
99f4a2713aSLionel Sambuc     GlobalNewDeleteDeclared(false),
100f4a2713aSLionel Sambuc     TUKind(TUKind),
101*0a6a1f1dSLionel Sambuc     NumSFINAEErrors(0),
102f4a2713aSLionel Sambuc     AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
103f4a2713aSLionel Sambuc     NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
104*0a6a1f1dSLionel Sambuc     CurrentInstantiationScope(nullptr), DisableTypoCorrection(false),
105f4a2713aSLionel Sambuc     TyposCorrected(0), AnalysisWarnings(*this),
106*0a6a1f1dSLionel Sambuc     VarDataSharingAttributesStack(nullptr), CurScope(nullptr),
107*0a6a1f1dSLionel Sambuc     Ident_super(nullptr), Ident___float128(nullptr)
108f4a2713aSLionel Sambuc {
109*0a6a1f1dSLionel Sambuc   TUScope = nullptr;
110f4a2713aSLionel Sambuc 
111f4a2713aSLionel Sambuc   LoadedExternalKnownNamespaces = false;
112f4a2713aSLionel Sambuc   for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
113*0a6a1f1dSLionel Sambuc     NSNumberLiteralMethods[I] = nullptr;
114f4a2713aSLionel Sambuc 
115f4a2713aSLionel Sambuc   if (getLangOpts().ObjC1)
116f4a2713aSLionel Sambuc     NSAPIObj.reset(new NSAPI(Context));
117f4a2713aSLionel Sambuc 
118f4a2713aSLionel Sambuc   if (getLangOpts().CPlusPlus)
119f4a2713aSLionel Sambuc     FieldCollector.reset(new CXXFieldCollector());
120f4a2713aSLionel Sambuc 
121f4a2713aSLionel Sambuc   // Tell diagnostics how to render things from the AST library.
122f4a2713aSLionel Sambuc   PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
123f4a2713aSLionel Sambuc                                        &Context);
124f4a2713aSLionel Sambuc 
125f4a2713aSLionel Sambuc   ExprEvalContexts.push_back(
126f4a2713aSLionel Sambuc         ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0,
127*0a6a1f1dSLionel Sambuc                                           false, nullptr, false));
128f4a2713aSLionel Sambuc 
129f4a2713aSLionel Sambuc   FunctionScopes.push_back(new FunctionScopeInfo(Diags));
130f4a2713aSLionel Sambuc 
131f4a2713aSLionel Sambuc   // Initilization of data sharing attributes stack for OpenMP
132f4a2713aSLionel Sambuc   InitDataSharingAttributesStack();
133f4a2713aSLionel Sambuc }
134f4a2713aSLionel Sambuc 
addImplicitTypedef(StringRef Name,QualType T)135*0a6a1f1dSLionel Sambuc void Sema::addImplicitTypedef(StringRef Name, QualType T) {
136*0a6a1f1dSLionel Sambuc   DeclarationName DN = &Context.Idents.get(Name);
137*0a6a1f1dSLionel Sambuc   if (IdResolver.begin(DN) == IdResolver.end())
138*0a6a1f1dSLionel Sambuc     PushOnScopeChains(Context.buildImplicitTypedef(T, Name), TUScope);
139*0a6a1f1dSLionel Sambuc }
140*0a6a1f1dSLionel Sambuc 
Initialize()141f4a2713aSLionel Sambuc void Sema::Initialize() {
142f4a2713aSLionel Sambuc   // Tell the AST consumer about this Sema object.
143f4a2713aSLionel Sambuc   Consumer.Initialize(Context);
144f4a2713aSLionel Sambuc 
145f4a2713aSLionel Sambuc   // FIXME: Isn't this redundant with the initialization above?
146f4a2713aSLionel Sambuc   if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
147f4a2713aSLionel Sambuc     SC->InitializeSema(*this);
148f4a2713aSLionel Sambuc 
149f4a2713aSLionel Sambuc   // Tell the external Sema source about this Sema object.
150f4a2713aSLionel Sambuc   if (ExternalSemaSource *ExternalSema
151f4a2713aSLionel Sambuc       = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
152f4a2713aSLionel Sambuc     ExternalSema->InitializeSema(*this);
153f4a2713aSLionel Sambuc 
154*0a6a1f1dSLionel Sambuc   // This needs to happen after ExternalSemaSource::InitializeSema(this) or we
155*0a6a1f1dSLionel Sambuc   // will not be able to merge any duplicate __va_list_tag decls correctly.
156*0a6a1f1dSLionel Sambuc   VAListTagName = PP.getIdentifierInfo("__va_list_tag");
157*0a6a1f1dSLionel Sambuc 
158f4a2713aSLionel Sambuc   // Initialize predefined 128-bit integer types, if needed.
159*0a6a1f1dSLionel Sambuc   if (Context.getTargetInfo().hasInt128Type()) {
160f4a2713aSLionel Sambuc     // If either of the 128-bit integer types are unavailable to name lookup,
161f4a2713aSLionel Sambuc     // define them now.
162f4a2713aSLionel Sambuc     DeclarationName Int128 = &Context.Idents.get("__int128_t");
163f4a2713aSLionel Sambuc     if (IdResolver.begin(Int128) == IdResolver.end())
164f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getInt128Decl(), TUScope);
165f4a2713aSLionel Sambuc 
166f4a2713aSLionel Sambuc     DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
167f4a2713aSLionel Sambuc     if (IdResolver.begin(UInt128) == IdResolver.end())
168f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getUInt128Decl(), TUScope);
169f4a2713aSLionel Sambuc   }
170f4a2713aSLionel Sambuc 
171f4a2713aSLionel Sambuc 
172f4a2713aSLionel Sambuc   // Initialize predefined Objective-C types:
173f4a2713aSLionel Sambuc   if (PP.getLangOpts().ObjC1) {
174f4a2713aSLionel Sambuc     // If 'SEL' does not yet refer to any declarations, make it refer to the
175f4a2713aSLionel Sambuc     // predefined 'SEL'.
176f4a2713aSLionel Sambuc     DeclarationName SEL = &Context.Idents.get("SEL");
177f4a2713aSLionel Sambuc     if (IdResolver.begin(SEL) == IdResolver.end())
178f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
179f4a2713aSLionel Sambuc 
180f4a2713aSLionel Sambuc     // If 'id' does not yet refer to any declarations, make it refer to the
181f4a2713aSLionel Sambuc     // predefined 'id'.
182f4a2713aSLionel Sambuc     DeclarationName Id = &Context.Idents.get("id");
183f4a2713aSLionel Sambuc     if (IdResolver.begin(Id) == IdResolver.end())
184f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
185f4a2713aSLionel Sambuc 
186f4a2713aSLionel Sambuc     // Create the built-in typedef for 'Class'.
187f4a2713aSLionel Sambuc     DeclarationName Class = &Context.Idents.get("Class");
188f4a2713aSLionel Sambuc     if (IdResolver.begin(Class) == IdResolver.end())
189f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
190f4a2713aSLionel Sambuc 
191f4a2713aSLionel Sambuc     // Create the built-in forward declaratino for 'Protocol'.
192f4a2713aSLionel Sambuc     DeclarationName Protocol = &Context.Idents.get("Protocol");
193f4a2713aSLionel Sambuc     if (IdResolver.begin(Protocol) == IdResolver.end())
194f4a2713aSLionel Sambuc       PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
195f4a2713aSLionel Sambuc   }
196f4a2713aSLionel Sambuc 
197*0a6a1f1dSLionel Sambuc   // Initialize Microsoft "predefined C++ types".
198*0a6a1f1dSLionel Sambuc   if (PP.getLangOpts().MSVCCompat && PP.getLangOpts().CPlusPlus) {
199*0a6a1f1dSLionel Sambuc     if (IdResolver.begin(&Context.Idents.get("type_info")) == IdResolver.end())
200*0a6a1f1dSLionel Sambuc       PushOnScopeChains(Context.buildImplicitRecord("type_info", TTK_Class),
201*0a6a1f1dSLionel Sambuc                         TUScope);
202*0a6a1f1dSLionel Sambuc 
203*0a6a1f1dSLionel Sambuc     addImplicitTypedef("size_t", Context.getSizeType());
204*0a6a1f1dSLionel Sambuc   }
205*0a6a1f1dSLionel Sambuc 
206*0a6a1f1dSLionel Sambuc   // Initialize predefined OpenCL types.
207*0a6a1f1dSLionel Sambuc   if (PP.getLangOpts().OpenCL) {
208*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image1d_t", Context.OCLImage1dTy);
209*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image1d_array_t", Context.OCLImage1dArrayTy);
210*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image1d_buffer_t", Context.OCLImage1dBufferTy);
211*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image2d_t", Context.OCLImage2dTy);
212*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image2d_array_t", Context.OCLImage2dArrayTy);
213*0a6a1f1dSLionel Sambuc     addImplicitTypedef("image3d_t", Context.OCLImage3dTy);
214*0a6a1f1dSLionel Sambuc     addImplicitTypedef("sampler_t", Context.OCLSamplerTy);
215*0a6a1f1dSLionel Sambuc     addImplicitTypedef("event_t", Context.OCLEventTy);
216*0a6a1f1dSLionel Sambuc   }
217*0a6a1f1dSLionel Sambuc 
218f4a2713aSLionel Sambuc   DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
219f4a2713aSLionel Sambuc   if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
220f4a2713aSLionel Sambuc     PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
221f4a2713aSLionel Sambuc }
222f4a2713aSLionel Sambuc 
~Sema()223f4a2713aSLionel Sambuc Sema::~Sema() {
224*0a6a1f1dSLionel Sambuc   llvm::DeleteContainerSeconds(LateParsedTemplateMap);
225f4a2713aSLionel Sambuc   if (PackContext) FreePackedContext();
226f4a2713aSLionel Sambuc   if (VisContext) FreeVisContext();
227f4a2713aSLionel Sambuc   // Kill all the active scopes.
228f4a2713aSLionel Sambuc   for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
229f4a2713aSLionel Sambuc     delete FunctionScopes[I];
230f4a2713aSLionel Sambuc   if (FunctionScopes.size() == 1)
231f4a2713aSLionel Sambuc     delete FunctionScopes[0];
232f4a2713aSLionel Sambuc 
233f4a2713aSLionel Sambuc   // Tell the SemaConsumer to forget about us; we're going out of scope.
234f4a2713aSLionel Sambuc   if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
235f4a2713aSLionel Sambuc     SC->ForgetSema();
236f4a2713aSLionel Sambuc 
237f4a2713aSLionel Sambuc   // Detach from the external Sema source.
238f4a2713aSLionel Sambuc   if (ExternalSemaSource *ExternalSema
239f4a2713aSLionel Sambuc         = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
240f4a2713aSLionel Sambuc     ExternalSema->ForgetSema();
241f4a2713aSLionel Sambuc 
242f4a2713aSLionel Sambuc   // If Sema's ExternalSource is the multiplexer - we own it.
243f4a2713aSLionel Sambuc   if (isMultiplexExternalSource)
244f4a2713aSLionel Sambuc     delete ExternalSource;
245f4a2713aSLionel Sambuc 
246f4a2713aSLionel Sambuc   // Destroys data sharing attributes stack for OpenMP
247f4a2713aSLionel Sambuc   DestroyDataSharingAttributesStack();
248*0a6a1f1dSLionel Sambuc 
249*0a6a1f1dSLionel Sambuc   assert(DelayedTypos.empty() && "Uncorrected typos!");
250f4a2713aSLionel Sambuc }
251f4a2713aSLionel Sambuc 
252f4a2713aSLionel Sambuc /// makeUnavailableInSystemHeader - There is an error in the current
253f4a2713aSLionel Sambuc /// context.  If we're still in a system header, and we can plausibly
254f4a2713aSLionel Sambuc /// make the relevant declaration unavailable instead of erroring, do
255f4a2713aSLionel Sambuc /// so and return true.
makeUnavailableInSystemHeader(SourceLocation loc,StringRef msg)256f4a2713aSLionel Sambuc bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
257f4a2713aSLionel Sambuc                                          StringRef msg) {
258f4a2713aSLionel Sambuc   // If we're not in a function, it's an error.
259f4a2713aSLionel Sambuc   FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
260f4a2713aSLionel Sambuc   if (!fn) return false;
261f4a2713aSLionel Sambuc 
262f4a2713aSLionel Sambuc   // If we're in template instantiation, it's an error.
263f4a2713aSLionel Sambuc   if (!ActiveTemplateInstantiations.empty())
264f4a2713aSLionel Sambuc     return false;
265f4a2713aSLionel Sambuc 
266f4a2713aSLionel Sambuc   // If that function's not in a system header, it's an error.
267f4a2713aSLionel Sambuc   if (!Context.getSourceManager().isInSystemHeader(loc))
268f4a2713aSLionel Sambuc     return false;
269f4a2713aSLionel Sambuc 
270f4a2713aSLionel Sambuc   // If the function is already unavailable, it's not an error.
271f4a2713aSLionel Sambuc   if (fn->hasAttr<UnavailableAttr>()) return true;
272f4a2713aSLionel Sambuc 
273*0a6a1f1dSLionel Sambuc   fn->addAttr(UnavailableAttr::CreateImplicit(Context, msg, loc));
274f4a2713aSLionel Sambuc   return true;
275f4a2713aSLionel Sambuc }
276f4a2713aSLionel Sambuc 
getASTMutationListener() const277f4a2713aSLionel Sambuc ASTMutationListener *Sema::getASTMutationListener() const {
278f4a2713aSLionel Sambuc   return getASTConsumer().GetASTMutationListener();
279f4a2713aSLionel Sambuc }
280f4a2713aSLionel Sambuc 
281f4a2713aSLionel Sambuc ///\brief Registers an external source. If an external source already exists,
282f4a2713aSLionel Sambuc /// creates a multiplex external source and appends to it.
283f4a2713aSLionel Sambuc ///
284f4a2713aSLionel Sambuc ///\param[in] E - A non-null external sema source.
285f4a2713aSLionel Sambuc ///
addExternalSource(ExternalSemaSource * E)286f4a2713aSLionel Sambuc void Sema::addExternalSource(ExternalSemaSource *E) {
287f4a2713aSLionel Sambuc   assert(E && "Cannot use with NULL ptr");
288f4a2713aSLionel Sambuc 
289f4a2713aSLionel Sambuc   if (!ExternalSource) {
290f4a2713aSLionel Sambuc     ExternalSource = E;
291f4a2713aSLionel Sambuc     return;
292f4a2713aSLionel Sambuc   }
293f4a2713aSLionel Sambuc 
294f4a2713aSLionel Sambuc   if (isMultiplexExternalSource)
295f4a2713aSLionel Sambuc     static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
296f4a2713aSLionel Sambuc   else {
297f4a2713aSLionel Sambuc     ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
298f4a2713aSLionel Sambuc     isMultiplexExternalSource = true;
299f4a2713aSLionel Sambuc   }
300f4a2713aSLionel Sambuc }
301f4a2713aSLionel Sambuc 
302f4a2713aSLionel Sambuc /// \brief Print out statistics about the semantic analysis.
PrintStats() const303f4a2713aSLionel Sambuc void Sema::PrintStats() const {
304f4a2713aSLionel Sambuc   llvm::errs() << "\n*** Semantic Analysis Stats:\n";
305f4a2713aSLionel Sambuc   llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
306f4a2713aSLionel Sambuc 
307f4a2713aSLionel Sambuc   BumpAlloc.PrintStats();
308f4a2713aSLionel Sambuc   AnalysisWarnings.PrintStats();
309f4a2713aSLionel Sambuc }
310f4a2713aSLionel Sambuc 
311f4a2713aSLionel Sambuc /// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
312f4a2713aSLionel Sambuc /// If there is already an implicit cast, merge into the existing one.
313f4a2713aSLionel Sambuc /// The result is of the given category.
ImpCastExprToType(Expr * E,QualType Ty,CastKind Kind,ExprValueKind VK,const CXXCastPath * BasePath,CheckedConversionKind CCK)314f4a2713aSLionel Sambuc ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
315f4a2713aSLionel Sambuc                                    CastKind Kind, ExprValueKind VK,
316f4a2713aSLionel Sambuc                                    const CXXCastPath *BasePath,
317f4a2713aSLionel Sambuc                                    CheckedConversionKind CCK) {
318f4a2713aSLionel Sambuc #ifndef NDEBUG
319f4a2713aSLionel Sambuc   if (VK == VK_RValue && !E->isRValue()) {
320f4a2713aSLionel Sambuc     switch (Kind) {
321f4a2713aSLionel Sambuc     default:
322*0a6a1f1dSLionel Sambuc       llvm_unreachable("can't implicitly cast lvalue to rvalue with this cast "
323*0a6a1f1dSLionel Sambuc                        "kind");
324f4a2713aSLionel Sambuc     case CK_LValueToRValue:
325f4a2713aSLionel Sambuc     case CK_ArrayToPointerDecay:
326f4a2713aSLionel Sambuc     case CK_FunctionToPointerDecay:
327f4a2713aSLionel Sambuc     case CK_ToVoid:
328f4a2713aSLionel Sambuc       break;
329f4a2713aSLionel Sambuc     }
330f4a2713aSLionel Sambuc   }
331f4a2713aSLionel Sambuc   assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
332f4a2713aSLionel Sambuc #endif
333f4a2713aSLionel Sambuc 
334f4a2713aSLionel Sambuc   QualType ExprTy = Context.getCanonicalType(E->getType());
335f4a2713aSLionel Sambuc   QualType TypeTy = Context.getCanonicalType(Ty);
336f4a2713aSLionel Sambuc 
337f4a2713aSLionel Sambuc   if (ExprTy == TypeTy)
338*0a6a1f1dSLionel Sambuc     return E;
339f4a2713aSLionel Sambuc 
340f4a2713aSLionel Sambuc   // If this is a derived-to-base cast to a through a virtual base, we
341f4a2713aSLionel Sambuc   // need a vtable.
342f4a2713aSLionel Sambuc   if (Kind == CK_DerivedToBase &&
343f4a2713aSLionel Sambuc       BasePathInvolvesVirtualBase(*BasePath)) {
344f4a2713aSLionel Sambuc     QualType T = E->getType();
345f4a2713aSLionel Sambuc     if (const PointerType *Pointer = T->getAs<PointerType>())
346f4a2713aSLionel Sambuc       T = Pointer->getPointeeType();
347f4a2713aSLionel Sambuc     if (const RecordType *RecordTy = T->getAs<RecordType>())
348f4a2713aSLionel Sambuc       MarkVTableUsed(E->getLocStart(),
349f4a2713aSLionel Sambuc                      cast<CXXRecordDecl>(RecordTy->getDecl()));
350f4a2713aSLionel Sambuc   }
351f4a2713aSLionel Sambuc 
352f4a2713aSLionel Sambuc   if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
353f4a2713aSLionel Sambuc     if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
354f4a2713aSLionel Sambuc       ImpCast->setType(Ty);
355f4a2713aSLionel Sambuc       ImpCast->setValueKind(VK);
356*0a6a1f1dSLionel Sambuc       return E;
357f4a2713aSLionel Sambuc     }
358f4a2713aSLionel Sambuc   }
359f4a2713aSLionel Sambuc 
360*0a6a1f1dSLionel Sambuc   return ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK);
361f4a2713aSLionel Sambuc }
362f4a2713aSLionel Sambuc 
363f4a2713aSLionel Sambuc /// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
364f4a2713aSLionel Sambuc /// to the conversion from scalar type ScalarTy to the Boolean type.
ScalarTypeToBooleanCastKind(QualType ScalarTy)365f4a2713aSLionel Sambuc CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
366f4a2713aSLionel Sambuc   switch (ScalarTy->getScalarTypeKind()) {
367f4a2713aSLionel Sambuc   case Type::STK_Bool: return CK_NoOp;
368f4a2713aSLionel Sambuc   case Type::STK_CPointer: return CK_PointerToBoolean;
369f4a2713aSLionel Sambuc   case Type::STK_BlockPointer: return CK_PointerToBoolean;
370f4a2713aSLionel Sambuc   case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
371f4a2713aSLionel Sambuc   case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
372f4a2713aSLionel Sambuc   case Type::STK_Integral: return CK_IntegralToBoolean;
373f4a2713aSLionel Sambuc   case Type::STK_Floating: return CK_FloatingToBoolean;
374f4a2713aSLionel Sambuc   case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
375f4a2713aSLionel Sambuc   case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
376f4a2713aSLionel Sambuc   }
377f4a2713aSLionel Sambuc   return CK_Invalid;
378f4a2713aSLionel Sambuc }
379f4a2713aSLionel Sambuc 
380f4a2713aSLionel Sambuc /// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
ShouldRemoveFromUnused(Sema * SemaRef,const DeclaratorDecl * D)381f4a2713aSLionel Sambuc static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
382f4a2713aSLionel Sambuc   if (D->getMostRecentDecl()->isUsed())
383f4a2713aSLionel Sambuc     return true;
384f4a2713aSLionel Sambuc 
385f4a2713aSLionel Sambuc   if (D->isExternallyVisible())
386f4a2713aSLionel Sambuc     return true;
387f4a2713aSLionel Sambuc 
388f4a2713aSLionel Sambuc   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
389f4a2713aSLionel Sambuc     // UnusedFileScopedDecls stores the first declaration.
390f4a2713aSLionel Sambuc     // The declaration may have become definition so check again.
391f4a2713aSLionel Sambuc     const FunctionDecl *DeclToCheck;
392f4a2713aSLionel Sambuc     if (FD->hasBody(DeclToCheck))
393f4a2713aSLionel Sambuc       return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
394f4a2713aSLionel Sambuc 
395f4a2713aSLionel Sambuc     // Later redecls may add new information resulting in not having to warn,
396f4a2713aSLionel Sambuc     // so check again.
397f4a2713aSLionel Sambuc     DeclToCheck = FD->getMostRecentDecl();
398f4a2713aSLionel Sambuc     if (DeclToCheck != FD)
399f4a2713aSLionel Sambuc       return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
400f4a2713aSLionel Sambuc   }
401f4a2713aSLionel Sambuc 
402f4a2713aSLionel Sambuc   if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
403f4a2713aSLionel Sambuc     // If a variable usable in constant expressions is referenced,
404f4a2713aSLionel Sambuc     // don't warn if it isn't used: if the value of a variable is required
405f4a2713aSLionel Sambuc     // for the computation of a constant expression, it doesn't make sense to
406f4a2713aSLionel Sambuc     // warn even if the variable isn't odr-used.  (isReferenced doesn't
407f4a2713aSLionel Sambuc     // precisely reflect that, but it's a decent approximation.)
408f4a2713aSLionel Sambuc     if (VD->isReferenced() &&
409f4a2713aSLionel Sambuc         VD->isUsableInConstantExpressions(SemaRef->Context))
410f4a2713aSLionel Sambuc       return true;
411f4a2713aSLionel Sambuc 
412f4a2713aSLionel Sambuc     // UnusedFileScopedDecls stores the first declaration.
413f4a2713aSLionel Sambuc     // The declaration may have become definition so check again.
414f4a2713aSLionel Sambuc     const VarDecl *DeclToCheck = VD->getDefinition();
415f4a2713aSLionel Sambuc     if (DeclToCheck)
416f4a2713aSLionel Sambuc       return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
417f4a2713aSLionel Sambuc 
418f4a2713aSLionel Sambuc     // Later redecls may add new information resulting in not having to warn,
419f4a2713aSLionel Sambuc     // so check again.
420f4a2713aSLionel Sambuc     DeclToCheck = VD->getMostRecentDecl();
421f4a2713aSLionel Sambuc     if (DeclToCheck != VD)
422f4a2713aSLionel Sambuc       return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
423f4a2713aSLionel Sambuc   }
424f4a2713aSLionel Sambuc 
425f4a2713aSLionel Sambuc   return false;
426f4a2713aSLionel Sambuc }
427f4a2713aSLionel Sambuc 
428f4a2713aSLionel Sambuc /// Obtains a sorted list of functions that are undefined but ODR-used.
getUndefinedButUsed(SmallVectorImpl<std::pair<NamedDecl *,SourceLocation>> & Undefined)429f4a2713aSLionel Sambuc void Sema::getUndefinedButUsed(
430f4a2713aSLionel Sambuc     SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> > &Undefined) {
431f4a2713aSLionel Sambuc   for (llvm::DenseMap<NamedDecl *, SourceLocation>::iterator
432f4a2713aSLionel Sambuc          I = UndefinedButUsed.begin(), E = UndefinedButUsed.end();
433f4a2713aSLionel Sambuc        I != E; ++I) {
434f4a2713aSLionel Sambuc     NamedDecl *ND = I->first;
435f4a2713aSLionel Sambuc 
436f4a2713aSLionel Sambuc     // Ignore attributes that have become invalid.
437f4a2713aSLionel Sambuc     if (ND->isInvalidDecl()) continue;
438f4a2713aSLionel Sambuc 
439f4a2713aSLionel Sambuc     // __attribute__((weakref)) is basically a definition.
440f4a2713aSLionel Sambuc     if (ND->hasAttr<WeakRefAttr>()) continue;
441f4a2713aSLionel Sambuc 
442f4a2713aSLionel Sambuc     if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
443f4a2713aSLionel Sambuc       if (FD->isDefined())
444f4a2713aSLionel Sambuc         continue;
445f4a2713aSLionel Sambuc       if (FD->isExternallyVisible() &&
446f4a2713aSLionel Sambuc           !FD->getMostRecentDecl()->isInlined())
447f4a2713aSLionel Sambuc         continue;
448f4a2713aSLionel Sambuc     } else {
449f4a2713aSLionel Sambuc       if (cast<VarDecl>(ND)->hasDefinition() != VarDecl::DeclarationOnly)
450f4a2713aSLionel Sambuc         continue;
451f4a2713aSLionel Sambuc       if (ND->isExternallyVisible())
452f4a2713aSLionel Sambuc         continue;
453f4a2713aSLionel Sambuc     }
454f4a2713aSLionel Sambuc 
455f4a2713aSLionel Sambuc     Undefined.push_back(std::make_pair(ND, I->second));
456f4a2713aSLionel Sambuc   }
457f4a2713aSLionel Sambuc 
458f4a2713aSLionel Sambuc   // Sort (in order of use site) so that we're not dependent on the iteration
459f4a2713aSLionel Sambuc   // order through an llvm::DenseMap.
460*0a6a1f1dSLionel Sambuc   SourceManager &SM = Context.getSourceManager();
461f4a2713aSLionel Sambuc   std::sort(Undefined.begin(), Undefined.end(),
462*0a6a1f1dSLionel Sambuc             [&SM](const std::pair<NamedDecl *, SourceLocation> &l,
463*0a6a1f1dSLionel Sambuc                   const std::pair<NamedDecl *, SourceLocation> &r) {
464*0a6a1f1dSLionel Sambuc     if (l.second.isValid() && !r.second.isValid())
465*0a6a1f1dSLionel Sambuc       return true;
466*0a6a1f1dSLionel Sambuc     if (!l.second.isValid() && r.second.isValid())
467*0a6a1f1dSLionel Sambuc       return false;
468*0a6a1f1dSLionel Sambuc     if (l.second != r.second)
469*0a6a1f1dSLionel Sambuc       return SM.isBeforeInTranslationUnit(l.second, r.second);
470*0a6a1f1dSLionel Sambuc     return SM.isBeforeInTranslationUnit(l.first->getLocation(),
471*0a6a1f1dSLionel Sambuc                                         r.first->getLocation());
472*0a6a1f1dSLionel Sambuc   });
473f4a2713aSLionel Sambuc }
474f4a2713aSLionel Sambuc 
475f4a2713aSLionel Sambuc /// checkUndefinedButUsed - Check for undefined objects with internal linkage
476f4a2713aSLionel Sambuc /// or that are inline.
checkUndefinedButUsed(Sema & S)477f4a2713aSLionel Sambuc static void checkUndefinedButUsed(Sema &S) {
478f4a2713aSLionel Sambuc   if (S.UndefinedButUsed.empty()) return;
479f4a2713aSLionel Sambuc 
480f4a2713aSLionel Sambuc   // Collect all the still-undefined entities with internal linkage.
481f4a2713aSLionel Sambuc   SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
482f4a2713aSLionel Sambuc   S.getUndefinedButUsed(Undefined);
483f4a2713aSLionel Sambuc   if (Undefined.empty()) return;
484f4a2713aSLionel Sambuc 
485f4a2713aSLionel Sambuc   for (SmallVectorImpl<std::pair<NamedDecl *, SourceLocation> >::iterator
486f4a2713aSLionel Sambuc          I = Undefined.begin(), E = Undefined.end(); I != E; ++I) {
487f4a2713aSLionel Sambuc     NamedDecl *ND = I->first;
488f4a2713aSLionel Sambuc 
489*0a6a1f1dSLionel Sambuc     if (ND->hasAttr<DLLImportAttr>() || ND->hasAttr<DLLExportAttr>()) {
490*0a6a1f1dSLionel Sambuc       // An exported function will always be emitted when defined, so even if
491*0a6a1f1dSLionel Sambuc       // the function is inline, it doesn't have to be emitted in this TU. An
492*0a6a1f1dSLionel Sambuc       // imported function implies that it has been exported somewhere else.
493*0a6a1f1dSLionel Sambuc       continue;
494*0a6a1f1dSLionel Sambuc     }
495*0a6a1f1dSLionel Sambuc 
496f4a2713aSLionel Sambuc     if (!ND->isExternallyVisible()) {
497f4a2713aSLionel Sambuc       S.Diag(ND->getLocation(), diag::warn_undefined_internal)
498f4a2713aSLionel Sambuc         << isa<VarDecl>(ND) << ND;
499f4a2713aSLionel Sambuc     } else {
500f4a2713aSLionel Sambuc       assert(cast<FunctionDecl>(ND)->getMostRecentDecl()->isInlined() &&
501f4a2713aSLionel Sambuc              "used object requires definition but isn't inline or internal?");
502f4a2713aSLionel Sambuc       S.Diag(ND->getLocation(), diag::warn_undefined_inline) << ND;
503f4a2713aSLionel Sambuc     }
504f4a2713aSLionel Sambuc     if (I->second.isValid())
505f4a2713aSLionel Sambuc       S.Diag(I->second, diag::note_used_here);
506f4a2713aSLionel Sambuc   }
507f4a2713aSLionel Sambuc }
508f4a2713aSLionel Sambuc 
LoadExternalWeakUndeclaredIdentifiers()509f4a2713aSLionel Sambuc void Sema::LoadExternalWeakUndeclaredIdentifiers() {
510f4a2713aSLionel Sambuc   if (!ExternalSource)
511f4a2713aSLionel Sambuc     return;
512f4a2713aSLionel Sambuc 
513f4a2713aSLionel Sambuc   SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
514f4a2713aSLionel Sambuc   ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
515f4a2713aSLionel Sambuc   for (unsigned I = 0, N = WeakIDs.size(); I != N; ++I) {
516f4a2713aSLionel Sambuc     llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator Pos
517f4a2713aSLionel Sambuc       = WeakUndeclaredIdentifiers.find(WeakIDs[I].first);
518f4a2713aSLionel Sambuc     if (Pos != WeakUndeclaredIdentifiers.end())
519f4a2713aSLionel Sambuc       continue;
520f4a2713aSLionel Sambuc 
521f4a2713aSLionel Sambuc     WeakUndeclaredIdentifiers.insert(WeakIDs[I]);
522f4a2713aSLionel Sambuc   }
523f4a2713aSLionel Sambuc }
524f4a2713aSLionel Sambuc 
525f4a2713aSLionel Sambuc 
526f4a2713aSLionel Sambuc typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
527f4a2713aSLionel Sambuc 
528f4a2713aSLionel Sambuc /// \brief Returns true, if all methods and nested classes of the given
529f4a2713aSLionel Sambuc /// CXXRecordDecl are defined in this translation unit.
530f4a2713aSLionel Sambuc ///
531f4a2713aSLionel Sambuc /// Should only be called from ActOnEndOfTranslationUnit so that all
532f4a2713aSLionel Sambuc /// definitions are actually read.
MethodsAndNestedClassesComplete(const CXXRecordDecl * RD,RecordCompleteMap & MNCComplete)533f4a2713aSLionel Sambuc static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
534f4a2713aSLionel Sambuc                                             RecordCompleteMap &MNCComplete) {
535f4a2713aSLionel Sambuc   RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
536f4a2713aSLionel Sambuc   if (Cache != MNCComplete.end())
537f4a2713aSLionel Sambuc     return Cache->second;
538f4a2713aSLionel Sambuc   if (!RD->isCompleteDefinition())
539f4a2713aSLionel Sambuc     return false;
540f4a2713aSLionel Sambuc   bool Complete = true;
541f4a2713aSLionel Sambuc   for (DeclContext::decl_iterator I = RD->decls_begin(),
542f4a2713aSLionel Sambuc                                   E = RD->decls_end();
543f4a2713aSLionel Sambuc        I != E && Complete; ++I) {
544f4a2713aSLionel Sambuc     if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
545f4a2713aSLionel Sambuc       Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
546f4a2713aSLionel Sambuc     else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
547*0a6a1f1dSLionel Sambuc       // If the template function is marked as late template parsed at this point,
548*0a6a1f1dSLionel Sambuc       // it has not been instantiated and therefore we have not performed semantic
549*0a6a1f1dSLionel Sambuc       // analysis on it yet, so we cannot know if the type can be considered
550*0a6a1f1dSLionel Sambuc       // complete.
551*0a6a1f1dSLionel Sambuc       Complete = !F->getTemplatedDecl()->isLateTemplateParsed() &&
552*0a6a1f1dSLionel Sambuc                   F->getTemplatedDecl()->isDefined();
553f4a2713aSLionel Sambuc     else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
554f4a2713aSLionel Sambuc       if (R->isInjectedClassName())
555f4a2713aSLionel Sambuc         continue;
556f4a2713aSLionel Sambuc       if (R->hasDefinition())
557f4a2713aSLionel Sambuc         Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
558f4a2713aSLionel Sambuc                                                    MNCComplete);
559f4a2713aSLionel Sambuc       else
560f4a2713aSLionel Sambuc         Complete = false;
561f4a2713aSLionel Sambuc     }
562f4a2713aSLionel Sambuc   }
563f4a2713aSLionel Sambuc   MNCComplete[RD] = Complete;
564f4a2713aSLionel Sambuc   return Complete;
565f4a2713aSLionel Sambuc }
566f4a2713aSLionel Sambuc 
567f4a2713aSLionel Sambuc /// \brief Returns true, if the given CXXRecordDecl is fully defined in this
568f4a2713aSLionel Sambuc /// translation unit, i.e. all methods are defined or pure virtual and all
569f4a2713aSLionel Sambuc /// friends, friend functions and nested classes are fully defined in this
570f4a2713aSLionel Sambuc /// translation unit.
571f4a2713aSLionel Sambuc ///
572f4a2713aSLionel Sambuc /// Should only be called from ActOnEndOfTranslationUnit so that all
573f4a2713aSLionel Sambuc /// definitions are actually read.
IsRecordFullyDefined(const CXXRecordDecl * RD,RecordCompleteMap & RecordsComplete,RecordCompleteMap & MNCComplete)574f4a2713aSLionel Sambuc static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
575f4a2713aSLionel Sambuc                                  RecordCompleteMap &RecordsComplete,
576f4a2713aSLionel Sambuc                                  RecordCompleteMap &MNCComplete) {
577f4a2713aSLionel Sambuc   RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
578f4a2713aSLionel Sambuc   if (Cache != RecordsComplete.end())
579f4a2713aSLionel Sambuc     return Cache->second;
580f4a2713aSLionel Sambuc   bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
581f4a2713aSLionel Sambuc   for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
582f4a2713aSLionel Sambuc                                       E = RD->friend_end();
583f4a2713aSLionel Sambuc        I != E && Complete; ++I) {
584f4a2713aSLionel Sambuc     // Check if friend classes and methods are complete.
585f4a2713aSLionel Sambuc     if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
586f4a2713aSLionel Sambuc       // Friend classes are available as the TypeSourceInfo of the FriendDecl.
587f4a2713aSLionel Sambuc       if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
588f4a2713aSLionel Sambuc         Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
589f4a2713aSLionel Sambuc       else
590f4a2713aSLionel Sambuc         Complete = false;
591f4a2713aSLionel Sambuc     } else {
592f4a2713aSLionel Sambuc       // Friend functions are available through the NamedDecl of FriendDecl.
593f4a2713aSLionel Sambuc       if (const FunctionDecl *FD =
594f4a2713aSLionel Sambuc           dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
595f4a2713aSLionel Sambuc         Complete = FD->isDefined();
596f4a2713aSLionel Sambuc       else
597f4a2713aSLionel Sambuc         // This is a template friend, give up.
598f4a2713aSLionel Sambuc         Complete = false;
599f4a2713aSLionel Sambuc     }
600f4a2713aSLionel Sambuc   }
601f4a2713aSLionel Sambuc   RecordsComplete[RD] = Complete;
602f4a2713aSLionel Sambuc   return Complete;
603f4a2713aSLionel Sambuc }
604f4a2713aSLionel Sambuc 
emitAndClearUnusedLocalTypedefWarnings()605*0a6a1f1dSLionel Sambuc void Sema::emitAndClearUnusedLocalTypedefWarnings() {
606*0a6a1f1dSLionel Sambuc   if (ExternalSource)
607*0a6a1f1dSLionel Sambuc     ExternalSource->ReadUnusedLocalTypedefNameCandidates(
608*0a6a1f1dSLionel Sambuc         UnusedLocalTypedefNameCandidates);
609*0a6a1f1dSLionel Sambuc   for (const TypedefNameDecl *TD : UnusedLocalTypedefNameCandidates) {
610*0a6a1f1dSLionel Sambuc     if (TD->isReferenced())
611*0a6a1f1dSLionel Sambuc       continue;
612*0a6a1f1dSLionel Sambuc     Diag(TD->getLocation(), diag::warn_unused_local_typedef)
613*0a6a1f1dSLionel Sambuc         << isa<TypeAliasDecl>(TD) << TD->getDeclName();
614*0a6a1f1dSLionel Sambuc   }
615*0a6a1f1dSLionel Sambuc   UnusedLocalTypedefNameCandidates.clear();
616*0a6a1f1dSLionel Sambuc }
617*0a6a1f1dSLionel Sambuc 
618f4a2713aSLionel Sambuc /// ActOnEndOfTranslationUnit - This is called at the very end of the
619f4a2713aSLionel Sambuc /// translation unit when EOF is reached and all but the top-level scope is
620f4a2713aSLionel Sambuc /// popped.
ActOnEndOfTranslationUnit()621f4a2713aSLionel Sambuc void Sema::ActOnEndOfTranslationUnit() {
622*0a6a1f1dSLionel Sambuc   assert(DelayedDiagnostics.getCurrentPool() == nullptr
623f4a2713aSLionel Sambuc          && "reached end of translation unit with a pool attached?");
624f4a2713aSLionel Sambuc 
625f4a2713aSLionel Sambuc   // If code completion is enabled, don't perform any end-of-translation-unit
626f4a2713aSLionel Sambuc   // work.
627f4a2713aSLionel Sambuc   if (PP.isCodeCompletionEnabled())
628f4a2713aSLionel Sambuc     return;
629f4a2713aSLionel Sambuc 
630f4a2713aSLionel Sambuc   // Complete translation units and modules define vtables and perform implicit
631f4a2713aSLionel Sambuc   // instantiations. PCH files do not.
632f4a2713aSLionel Sambuc   if (TUKind != TU_Prefix) {
633f4a2713aSLionel Sambuc     DiagnoseUseOfUnimplementedSelectors();
634f4a2713aSLionel Sambuc 
635f4a2713aSLionel Sambuc     // If any dynamic classes have their key function defined within
636f4a2713aSLionel Sambuc     // this translation unit, then those vtables are considered "used" and must
637f4a2713aSLionel Sambuc     // be emitted.
638f4a2713aSLionel Sambuc     for (DynamicClassesType::iterator I = DynamicClasses.begin(ExternalSource),
639f4a2713aSLionel Sambuc                                       E = DynamicClasses.end();
640f4a2713aSLionel Sambuc          I != E; ++I) {
641f4a2713aSLionel Sambuc       assert(!(*I)->isDependentType() &&
642f4a2713aSLionel Sambuc              "Should not see dependent types here!");
643*0a6a1f1dSLionel Sambuc       if (const CXXMethodDecl *KeyFunction =
644*0a6a1f1dSLionel Sambuc               Context.getCurrentKeyFunction(*I)) {
645*0a6a1f1dSLionel Sambuc         const FunctionDecl *Definition = nullptr;
646f4a2713aSLionel Sambuc         if (KeyFunction->hasBody(Definition))
647f4a2713aSLionel Sambuc           MarkVTableUsed(Definition->getLocation(), *I, true);
648f4a2713aSLionel Sambuc       }
649f4a2713aSLionel Sambuc     }
650f4a2713aSLionel Sambuc 
651f4a2713aSLionel Sambuc     // If DefinedUsedVTables ends up marking any virtual member functions it
652f4a2713aSLionel Sambuc     // might lead to more pending template instantiations, which we then need
653f4a2713aSLionel Sambuc     // to instantiate.
654f4a2713aSLionel Sambuc     DefineUsedVTables();
655f4a2713aSLionel Sambuc 
656f4a2713aSLionel Sambuc     // C++: Perform implicit template instantiations.
657f4a2713aSLionel Sambuc     //
658f4a2713aSLionel Sambuc     // FIXME: When we perform these implicit instantiations, we do not
659f4a2713aSLionel Sambuc     // carefully keep track of the point of instantiation (C++ [temp.point]).
660f4a2713aSLionel Sambuc     // This means that name lookup that occurs within the template
661f4a2713aSLionel Sambuc     // instantiation will always happen at the end of the translation unit,
662f4a2713aSLionel Sambuc     // so it will find some names that are not required to be found. This is
663f4a2713aSLionel Sambuc     // valid, but we could do better by diagnosing if an instantiation uses a
664f4a2713aSLionel Sambuc     // name that was not visible at its first point of instantiation.
665*0a6a1f1dSLionel Sambuc     if (ExternalSource) {
666*0a6a1f1dSLionel Sambuc       // Load pending instantiations from the external source.
667*0a6a1f1dSLionel Sambuc       SmallVector<PendingImplicitInstantiation, 4> Pending;
668*0a6a1f1dSLionel Sambuc       ExternalSource->ReadPendingInstantiations(Pending);
669*0a6a1f1dSLionel Sambuc       PendingInstantiations.insert(PendingInstantiations.begin(),
670*0a6a1f1dSLionel Sambuc                                    Pending.begin(), Pending.end());
671*0a6a1f1dSLionel Sambuc     }
672f4a2713aSLionel Sambuc     PerformPendingInstantiations();
673*0a6a1f1dSLionel Sambuc 
674*0a6a1f1dSLionel Sambuc     if (LateTemplateParserCleanup)
675*0a6a1f1dSLionel Sambuc       LateTemplateParserCleanup(OpaqueParser);
676*0a6a1f1dSLionel Sambuc 
677f4a2713aSLionel Sambuc     CheckDelayedMemberExceptionSpecs();
678f4a2713aSLionel Sambuc   }
679f4a2713aSLionel Sambuc 
680f4a2713aSLionel Sambuc   // All delayed member exception specs should be checked or we end up accepting
681f4a2713aSLionel Sambuc   // incompatible declarations.
682f4a2713aSLionel Sambuc   assert(DelayedDefaultedMemberExceptionSpecs.empty());
683*0a6a1f1dSLionel Sambuc   assert(DelayedExceptionSpecChecks.empty());
684f4a2713aSLionel Sambuc 
685f4a2713aSLionel Sambuc   // Remove file scoped decls that turned out to be used.
686f4a2713aSLionel Sambuc   UnusedFileScopedDecls.erase(
687*0a6a1f1dSLionel Sambuc       std::remove_if(UnusedFileScopedDecls.begin(nullptr, true),
688f4a2713aSLionel Sambuc                      UnusedFileScopedDecls.end(),
689f4a2713aSLionel Sambuc                      std::bind1st(std::ptr_fun(ShouldRemoveFromUnused), this)),
690f4a2713aSLionel Sambuc       UnusedFileScopedDecls.end());
691f4a2713aSLionel Sambuc 
692f4a2713aSLionel Sambuc   if (TUKind == TU_Prefix) {
693f4a2713aSLionel Sambuc     // Translation unit prefixes don't need any of the checking below.
694*0a6a1f1dSLionel Sambuc     TUScope = nullptr;
695f4a2713aSLionel Sambuc     return;
696f4a2713aSLionel Sambuc   }
697f4a2713aSLionel Sambuc 
698f4a2713aSLionel Sambuc   // Check for #pragma weak identifiers that were never declared
699f4a2713aSLionel Sambuc   // FIXME: This will cause diagnostics to be emitted in a non-determinstic
700f4a2713aSLionel Sambuc   // order!  Iterating over a densemap like this is bad.
701f4a2713aSLionel Sambuc   LoadExternalWeakUndeclaredIdentifiers();
702f4a2713aSLionel Sambuc   for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
703f4a2713aSLionel Sambuc        I = WeakUndeclaredIdentifiers.begin(),
704f4a2713aSLionel Sambuc        E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
705f4a2713aSLionel Sambuc     if (I->second.getUsed()) continue;
706f4a2713aSLionel Sambuc 
707f4a2713aSLionel Sambuc     Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
708f4a2713aSLionel Sambuc       << I->first;
709f4a2713aSLionel Sambuc   }
710f4a2713aSLionel Sambuc 
711f4a2713aSLionel Sambuc   if (LangOpts.CPlusPlus11 &&
712*0a6a1f1dSLionel Sambuc       !Diags.isIgnored(diag::warn_delegating_ctor_cycle, SourceLocation()))
713f4a2713aSLionel Sambuc     CheckDelegatingCtorCycles();
714f4a2713aSLionel Sambuc 
715f4a2713aSLionel Sambuc   if (TUKind == TU_Module) {
716f4a2713aSLionel Sambuc     // If we are building a module, resolve all of the exported declarations
717f4a2713aSLionel Sambuc     // now.
718f4a2713aSLionel Sambuc     if (Module *CurrentModule = PP.getCurrentModule()) {
719f4a2713aSLionel Sambuc       ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
720f4a2713aSLionel Sambuc 
721f4a2713aSLionel Sambuc       SmallVector<Module *, 2> Stack;
722f4a2713aSLionel Sambuc       Stack.push_back(CurrentModule);
723f4a2713aSLionel Sambuc       while (!Stack.empty()) {
724f4a2713aSLionel Sambuc         Module *Mod = Stack.pop_back_val();
725f4a2713aSLionel Sambuc 
726f4a2713aSLionel Sambuc         // Resolve the exported declarations and conflicts.
727f4a2713aSLionel Sambuc         // FIXME: Actually complain, once we figure out how to teach the
728f4a2713aSLionel Sambuc         // diagnostic client to deal with complaints in the module map at this
729f4a2713aSLionel Sambuc         // point.
730f4a2713aSLionel Sambuc         ModMap.resolveExports(Mod, /*Complain=*/false);
731f4a2713aSLionel Sambuc         ModMap.resolveUses(Mod, /*Complain=*/false);
732f4a2713aSLionel Sambuc         ModMap.resolveConflicts(Mod, /*Complain=*/false);
733f4a2713aSLionel Sambuc 
734f4a2713aSLionel Sambuc         // Queue the submodules, so their exports will also be resolved.
735f4a2713aSLionel Sambuc         for (Module::submodule_iterator Sub = Mod->submodule_begin(),
736f4a2713aSLionel Sambuc                                      SubEnd = Mod->submodule_end();
737f4a2713aSLionel Sambuc              Sub != SubEnd; ++Sub) {
738f4a2713aSLionel Sambuc           Stack.push_back(*Sub);
739f4a2713aSLionel Sambuc         }
740f4a2713aSLionel Sambuc       }
741f4a2713aSLionel Sambuc     }
742f4a2713aSLionel Sambuc 
743*0a6a1f1dSLionel Sambuc     // Warnings emitted in ActOnEndOfTranslationUnit() should be emitted for
744*0a6a1f1dSLionel Sambuc     // modules when they are built, not every time they are used.
745*0a6a1f1dSLionel Sambuc     emitAndClearUnusedLocalTypedefWarnings();
746*0a6a1f1dSLionel Sambuc 
747f4a2713aSLionel Sambuc     // Modules don't need any of the checking below.
748*0a6a1f1dSLionel Sambuc     TUScope = nullptr;
749f4a2713aSLionel Sambuc     return;
750f4a2713aSLionel Sambuc   }
751f4a2713aSLionel Sambuc 
752f4a2713aSLionel Sambuc   // C99 6.9.2p2:
753f4a2713aSLionel Sambuc   //   A declaration of an identifier for an object that has file
754f4a2713aSLionel Sambuc   //   scope without an initializer, and without a storage-class
755f4a2713aSLionel Sambuc   //   specifier or with the storage-class specifier static,
756f4a2713aSLionel Sambuc   //   constitutes a tentative definition. If a translation unit
757f4a2713aSLionel Sambuc   //   contains one or more tentative definitions for an identifier,
758f4a2713aSLionel Sambuc   //   and the translation unit contains no external definition for
759f4a2713aSLionel Sambuc   //   that identifier, then the behavior is exactly as if the
760f4a2713aSLionel Sambuc   //   translation unit contains a file scope declaration of that
761f4a2713aSLionel Sambuc   //   identifier, with the composite type as of the end of the
762f4a2713aSLionel Sambuc   //   translation unit, with an initializer equal to 0.
763f4a2713aSLionel Sambuc   llvm::SmallSet<VarDecl *, 32> Seen;
764f4a2713aSLionel Sambuc   for (TentativeDefinitionsType::iterator
765f4a2713aSLionel Sambuc             T = TentativeDefinitions.begin(ExternalSource),
766f4a2713aSLionel Sambuc          TEnd = TentativeDefinitions.end();
767f4a2713aSLionel Sambuc        T != TEnd; ++T)
768f4a2713aSLionel Sambuc   {
769f4a2713aSLionel Sambuc     VarDecl *VD = (*T)->getActingDefinition();
770f4a2713aSLionel Sambuc 
771f4a2713aSLionel Sambuc     // If the tentative definition was completed, getActingDefinition() returns
772f4a2713aSLionel Sambuc     // null. If we've already seen this variable before, insert()'s second
773f4a2713aSLionel Sambuc     // return value is false.
774*0a6a1f1dSLionel Sambuc     if (!VD || VD->isInvalidDecl() || !Seen.insert(VD).second)
775f4a2713aSLionel Sambuc       continue;
776f4a2713aSLionel Sambuc 
777f4a2713aSLionel Sambuc     if (const IncompleteArrayType *ArrayT
778f4a2713aSLionel Sambuc         = Context.getAsIncompleteArrayType(VD->getType())) {
779f4a2713aSLionel Sambuc       // Set the length of the array to 1 (C99 6.9.2p5).
780f4a2713aSLionel Sambuc       Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
781f4a2713aSLionel Sambuc       llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
782f4a2713aSLionel Sambuc       QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
783f4a2713aSLionel Sambuc                                                 One, ArrayType::Normal, 0);
784f4a2713aSLionel Sambuc       VD->setType(T);
785f4a2713aSLionel Sambuc     } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
786f4a2713aSLionel Sambuc                                    diag::err_tentative_def_incomplete_type))
787f4a2713aSLionel Sambuc       VD->setInvalidDecl();
788f4a2713aSLionel Sambuc 
789f4a2713aSLionel Sambuc     CheckCompleteVariableDeclaration(VD);
790f4a2713aSLionel Sambuc 
791f4a2713aSLionel Sambuc     // Notify the consumer that we've completed a tentative definition.
792f4a2713aSLionel Sambuc     if (!VD->isInvalidDecl())
793f4a2713aSLionel Sambuc       Consumer.CompleteTentativeDefinition(VD);
794f4a2713aSLionel Sambuc 
795f4a2713aSLionel Sambuc   }
796f4a2713aSLionel Sambuc 
797f4a2713aSLionel Sambuc   // If there were errors, disable 'unused' warnings since they will mostly be
798f4a2713aSLionel Sambuc   // noise.
799f4a2713aSLionel Sambuc   if (!Diags.hasErrorOccurred()) {
800f4a2713aSLionel Sambuc     // Output warning for unused file scoped decls.
801f4a2713aSLionel Sambuc     for (UnusedFileScopedDeclsType::iterator
802f4a2713aSLionel Sambuc            I = UnusedFileScopedDecls.begin(ExternalSource),
803f4a2713aSLionel Sambuc            E = UnusedFileScopedDecls.end(); I != E; ++I) {
804f4a2713aSLionel Sambuc       if (ShouldRemoveFromUnused(this, *I))
805f4a2713aSLionel Sambuc         continue;
806f4a2713aSLionel Sambuc 
807f4a2713aSLionel Sambuc       if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
808f4a2713aSLionel Sambuc         const FunctionDecl *DiagD;
809f4a2713aSLionel Sambuc         if (!FD->hasBody(DiagD))
810f4a2713aSLionel Sambuc           DiagD = FD;
811f4a2713aSLionel Sambuc         if (DiagD->isDeleted())
812f4a2713aSLionel Sambuc           continue; // Deleted functions are supposed to be unused.
813f4a2713aSLionel Sambuc         if (DiagD->isReferenced()) {
814f4a2713aSLionel Sambuc           if (isa<CXXMethodDecl>(DiagD))
815f4a2713aSLionel Sambuc             Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
816f4a2713aSLionel Sambuc                   << DiagD->getDeclName();
817f4a2713aSLionel Sambuc           else {
818f4a2713aSLionel Sambuc             if (FD->getStorageClass() == SC_Static &&
819f4a2713aSLionel Sambuc                 !FD->isInlineSpecified() &&
820f4a2713aSLionel Sambuc                 !SourceMgr.isInMainFile(
821f4a2713aSLionel Sambuc                    SourceMgr.getExpansionLoc(FD->getLocation())))
822*0a6a1f1dSLionel Sambuc               Diag(DiagD->getLocation(),
823*0a6a1f1dSLionel Sambuc                    diag::warn_unneeded_static_internal_decl)
824f4a2713aSLionel Sambuc                   << DiagD->getDeclName();
825f4a2713aSLionel Sambuc             else
826f4a2713aSLionel Sambuc               Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
827f4a2713aSLionel Sambuc                    << /*function*/0 << DiagD->getDeclName();
828f4a2713aSLionel Sambuc           }
829f4a2713aSLionel Sambuc         } else {
830f4a2713aSLionel Sambuc           Diag(DiagD->getLocation(),
831f4a2713aSLionel Sambuc                isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
832f4a2713aSLionel Sambuc                                          : diag::warn_unused_function)
833f4a2713aSLionel Sambuc                 << DiagD->getDeclName();
834f4a2713aSLionel Sambuc         }
835f4a2713aSLionel Sambuc       } else {
836f4a2713aSLionel Sambuc         const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
837f4a2713aSLionel Sambuc         if (!DiagD)
838f4a2713aSLionel Sambuc           DiagD = cast<VarDecl>(*I);
839f4a2713aSLionel Sambuc         if (DiagD->isReferenced()) {
840f4a2713aSLionel Sambuc           Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
841f4a2713aSLionel Sambuc                 << /*variable*/1 << DiagD->getDeclName();
842f4a2713aSLionel Sambuc         } else if (DiagD->getType().isConstQualified()) {
843f4a2713aSLionel Sambuc           Diag(DiagD->getLocation(), diag::warn_unused_const_variable)
844f4a2713aSLionel Sambuc               << DiagD->getDeclName();
845f4a2713aSLionel Sambuc         } else {
846f4a2713aSLionel Sambuc           Diag(DiagD->getLocation(), diag::warn_unused_variable)
847f4a2713aSLionel Sambuc               << DiagD->getDeclName();
848f4a2713aSLionel Sambuc         }
849f4a2713aSLionel Sambuc       }
850f4a2713aSLionel Sambuc     }
851f4a2713aSLionel Sambuc 
852f4a2713aSLionel Sambuc     if (ExternalSource)
853f4a2713aSLionel Sambuc       ExternalSource->ReadUndefinedButUsed(UndefinedButUsed);
854f4a2713aSLionel Sambuc     checkUndefinedButUsed(*this);
855*0a6a1f1dSLionel Sambuc 
856*0a6a1f1dSLionel Sambuc     emitAndClearUnusedLocalTypedefWarnings();
857f4a2713aSLionel Sambuc   }
858f4a2713aSLionel Sambuc 
859*0a6a1f1dSLionel Sambuc   if (!Diags.isIgnored(diag::warn_unused_private_field, SourceLocation())) {
860f4a2713aSLionel Sambuc     RecordCompleteMap RecordsComplete;
861f4a2713aSLionel Sambuc     RecordCompleteMap MNCComplete;
862f4a2713aSLionel Sambuc     for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
863f4a2713aSLionel Sambuc          E = UnusedPrivateFields.end(); I != E; ++I) {
864f4a2713aSLionel Sambuc       const NamedDecl *D = *I;
865f4a2713aSLionel Sambuc       const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
866f4a2713aSLionel Sambuc       if (RD && !RD->isUnion() &&
867f4a2713aSLionel Sambuc           IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
868f4a2713aSLionel Sambuc         Diag(D->getLocation(), diag::warn_unused_private_field)
869f4a2713aSLionel Sambuc               << D->getDeclName();
870f4a2713aSLionel Sambuc       }
871f4a2713aSLionel Sambuc     }
872f4a2713aSLionel Sambuc   }
873f4a2713aSLionel Sambuc 
874f4a2713aSLionel Sambuc   // Check we've noticed that we're no longer parsing the initializer for every
875f4a2713aSLionel Sambuc   // variable. If we miss cases, then at best we have a performance issue and
876f4a2713aSLionel Sambuc   // at worst a rejects-valid bug.
877f4a2713aSLionel Sambuc   assert(ParsingInitForAutoVars.empty() &&
878f4a2713aSLionel Sambuc          "Didn't unmark var as having its initializer parsed");
879f4a2713aSLionel Sambuc 
880*0a6a1f1dSLionel Sambuc   TUScope = nullptr;
881f4a2713aSLionel Sambuc }
882f4a2713aSLionel Sambuc 
883f4a2713aSLionel Sambuc 
884f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
885f4a2713aSLionel Sambuc // Helper functions.
886f4a2713aSLionel Sambuc //===----------------------------------------------------------------------===//
887f4a2713aSLionel Sambuc 
getFunctionLevelDeclContext()888f4a2713aSLionel Sambuc DeclContext *Sema::getFunctionLevelDeclContext() {
889f4a2713aSLionel Sambuc   DeclContext *DC = CurContext;
890f4a2713aSLionel Sambuc 
891f4a2713aSLionel Sambuc   while (true) {
892f4a2713aSLionel Sambuc     if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC) || isa<CapturedDecl>(DC)) {
893f4a2713aSLionel Sambuc       DC = DC->getParent();
894f4a2713aSLionel Sambuc     } else if (isa<CXXMethodDecl>(DC) &&
895f4a2713aSLionel Sambuc                cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
896f4a2713aSLionel Sambuc                cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
897f4a2713aSLionel Sambuc       DC = DC->getParent()->getParent();
898f4a2713aSLionel Sambuc     }
899f4a2713aSLionel Sambuc     else break;
900f4a2713aSLionel Sambuc   }
901f4a2713aSLionel Sambuc 
902f4a2713aSLionel Sambuc   return DC;
903f4a2713aSLionel Sambuc }
904f4a2713aSLionel Sambuc 
905f4a2713aSLionel Sambuc /// getCurFunctionDecl - If inside of a function body, this returns a pointer
906f4a2713aSLionel Sambuc /// to the function decl for the function being parsed.  If we're currently
907f4a2713aSLionel Sambuc /// in a 'block', this returns the containing context.
getCurFunctionDecl()908f4a2713aSLionel Sambuc FunctionDecl *Sema::getCurFunctionDecl() {
909f4a2713aSLionel Sambuc   DeclContext *DC = getFunctionLevelDeclContext();
910f4a2713aSLionel Sambuc   return dyn_cast<FunctionDecl>(DC);
911f4a2713aSLionel Sambuc }
912f4a2713aSLionel Sambuc 
getCurMethodDecl()913f4a2713aSLionel Sambuc ObjCMethodDecl *Sema::getCurMethodDecl() {
914f4a2713aSLionel Sambuc   DeclContext *DC = getFunctionLevelDeclContext();
915f4a2713aSLionel Sambuc   while (isa<RecordDecl>(DC))
916f4a2713aSLionel Sambuc     DC = DC->getParent();
917f4a2713aSLionel Sambuc   return dyn_cast<ObjCMethodDecl>(DC);
918f4a2713aSLionel Sambuc }
919f4a2713aSLionel Sambuc 
getCurFunctionOrMethodDecl()920f4a2713aSLionel Sambuc NamedDecl *Sema::getCurFunctionOrMethodDecl() {
921f4a2713aSLionel Sambuc   DeclContext *DC = getFunctionLevelDeclContext();
922f4a2713aSLionel Sambuc   if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
923f4a2713aSLionel Sambuc     return cast<NamedDecl>(DC);
924*0a6a1f1dSLionel Sambuc   return nullptr;
925f4a2713aSLionel Sambuc }
926f4a2713aSLionel Sambuc 
EmitCurrentDiagnostic(unsigned DiagID)927f4a2713aSLionel Sambuc void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
928f4a2713aSLionel Sambuc   // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
929f4a2713aSLionel Sambuc   // and yet we also use the current diag ID on the DiagnosticsEngine. This has
930f4a2713aSLionel Sambuc   // been made more painfully obvious by the refactor that introduced this
931f4a2713aSLionel Sambuc   // function, but it is possible that the incoming argument can be
932f4a2713aSLionel Sambuc   // eliminnated. If it truly cannot be (for example, there is some reentrancy
933f4a2713aSLionel Sambuc   // issue I am not seeing yet), then there should at least be a clarifying
934f4a2713aSLionel Sambuc   // comment somewhere.
935f4a2713aSLionel Sambuc   if (Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
936f4a2713aSLionel Sambuc     switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
937f4a2713aSLionel Sambuc               Diags.getCurrentDiagID())) {
938f4a2713aSLionel Sambuc     case DiagnosticIDs::SFINAE_Report:
939f4a2713aSLionel Sambuc       // We'll report the diagnostic below.
940f4a2713aSLionel Sambuc       break;
941f4a2713aSLionel Sambuc 
942f4a2713aSLionel Sambuc     case DiagnosticIDs::SFINAE_SubstitutionFailure:
943f4a2713aSLionel Sambuc       // Count this failure so that we know that template argument deduction
944f4a2713aSLionel Sambuc       // has failed.
945f4a2713aSLionel Sambuc       ++NumSFINAEErrors;
946f4a2713aSLionel Sambuc 
947f4a2713aSLionel Sambuc       // Make a copy of this suppressed diagnostic and store it with the
948f4a2713aSLionel Sambuc       // template-deduction information.
949f4a2713aSLionel Sambuc       if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
950f4a2713aSLionel Sambuc         Diagnostic DiagInfo(&Diags);
951f4a2713aSLionel Sambuc         (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
952f4a2713aSLionel Sambuc                        PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
953f4a2713aSLionel Sambuc       }
954f4a2713aSLionel Sambuc 
955f4a2713aSLionel Sambuc       Diags.setLastDiagnosticIgnored();
956f4a2713aSLionel Sambuc       Diags.Clear();
957f4a2713aSLionel Sambuc       return;
958f4a2713aSLionel Sambuc 
959f4a2713aSLionel Sambuc     case DiagnosticIDs::SFINAE_AccessControl: {
960f4a2713aSLionel Sambuc       // Per C++ Core Issue 1170, access control is part of SFINAE.
961f4a2713aSLionel Sambuc       // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
962f4a2713aSLionel Sambuc       // make access control a part of SFINAE for the purposes of checking
963f4a2713aSLionel Sambuc       // type traits.
964f4a2713aSLionel Sambuc       if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus11)
965f4a2713aSLionel Sambuc         break;
966f4a2713aSLionel Sambuc 
967f4a2713aSLionel Sambuc       SourceLocation Loc = Diags.getCurrentDiagLoc();
968f4a2713aSLionel Sambuc 
969f4a2713aSLionel Sambuc       // Suppress this diagnostic.
970f4a2713aSLionel Sambuc       ++NumSFINAEErrors;
971f4a2713aSLionel Sambuc 
972f4a2713aSLionel Sambuc       // Make a copy of this suppressed diagnostic and store it with the
973f4a2713aSLionel Sambuc       // template-deduction information.
974f4a2713aSLionel Sambuc       if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
975f4a2713aSLionel Sambuc         Diagnostic DiagInfo(&Diags);
976f4a2713aSLionel Sambuc         (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
977f4a2713aSLionel Sambuc                        PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
978f4a2713aSLionel Sambuc       }
979f4a2713aSLionel Sambuc 
980f4a2713aSLionel Sambuc       Diags.setLastDiagnosticIgnored();
981f4a2713aSLionel Sambuc       Diags.Clear();
982f4a2713aSLionel Sambuc 
983f4a2713aSLionel Sambuc       // Now the diagnostic state is clear, produce a C++98 compatibility
984f4a2713aSLionel Sambuc       // warning.
985f4a2713aSLionel Sambuc       Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
986f4a2713aSLionel Sambuc 
987f4a2713aSLionel Sambuc       // The last diagnostic which Sema produced was ignored. Suppress any
988f4a2713aSLionel Sambuc       // notes attached to it.
989f4a2713aSLionel Sambuc       Diags.setLastDiagnosticIgnored();
990f4a2713aSLionel Sambuc       return;
991f4a2713aSLionel Sambuc     }
992f4a2713aSLionel Sambuc 
993f4a2713aSLionel Sambuc     case DiagnosticIDs::SFINAE_Suppress:
994f4a2713aSLionel Sambuc       // Make a copy of this suppressed diagnostic and store it with the
995f4a2713aSLionel Sambuc       // template-deduction information;
996f4a2713aSLionel Sambuc       if (*Info) {
997f4a2713aSLionel Sambuc         Diagnostic DiagInfo(&Diags);
998f4a2713aSLionel Sambuc         (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
999f4a2713aSLionel Sambuc                        PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
1000f4a2713aSLionel Sambuc       }
1001f4a2713aSLionel Sambuc 
1002f4a2713aSLionel Sambuc       // Suppress this diagnostic.
1003f4a2713aSLionel Sambuc       Diags.setLastDiagnosticIgnored();
1004f4a2713aSLionel Sambuc       Diags.Clear();
1005f4a2713aSLionel Sambuc       return;
1006f4a2713aSLionel Sambuc     }
1007f4a2713aSLionel Sambuc   }
1008f4a2713aSLionel Sambuc 
1009f4a2713aSLionel Sambuc   // Set up the context's printing policy based on our current state.
1010f4a2713aSLionel Sambuc   Context.setPrintingPolicy(getPrintingPolicy());
1011f4a2713aSLionel Sambuc 
1012f4a2713aSLionel Sambuc   // Emit the diagnostic.
1013f4a2713aSLionel Sambuc   if (!Diags.EmitCurrentDiagnostic())
1014f4a2713aSLionel Sambuc     return;
1015f4a2713aSLionel Sambuc 
1016f4a2713aSLionel Sambuc   // If this is not a note, and we're in a template instantiation
1017f4a2713aSLionel Sambuc   // that is different from the last template instantiation where
1018f4a2713aSLionel Sambuc   // we emitted an error, print a template instantiation
1019f4a2713aSLionel Sambuc   // backtrace.
1020f4a2713aSLionel Sambuc   if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
1021f4a2713aSLionel Sambuc       !ActiveTemplateInstantiations.empty() &&
1022f4a2713aSLionel Sambuc       ActiveTemplateInstantiations.back()
1023f4a2713aSLionel Sambuc         != LastTemplateInstantiationErrorContext) {
1024f4a2713aSLionel Sambuc     PrintInstantiationStack();
1025f4a2713aSLionel Sambuc     LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
1026f4a2713aSLionel Sambuc   }
1027f4a2713aSLionel Sambuc }
1028f4a2713aSLionel Sambuc 
1029f4a2713aSLionel Sambuc Sema::SemaDiagnosticBuilder
Diag(SourceLocation Loc,const PartialDiagnostic & PD)1030f4a2713aSLionel Sambuc Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
1031f4a2713aSLionel Sambuc   SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
1032f4a2713aSLionel Sambuc   PD.Emit(Builder);
1033f4a2713aSLionel Sambuc 
1034f4a2713aSLionel Sambuc   return Builder;
1035f4a2713aSLionel Sambuc }
1036f4a2713aSLionel Sambuc 
1037f4a2713aSLionel Sambuc /// \brief Looks through the macro-expansion chain for the given
1038f4a2713aSLionel Sambuc /// location, looking for a macro expansion with the given name.
1039f4a2713aSLionel Sambuc /// If one is found, returns true and sets the location to that
1040f4a2713aSLionel Sambuc /// expansion loc.
findMacroSpelling(SourceLocation & locref,StringRef name)1041f4a2713aSLionel Sambuc bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
1042f4a2713aSLionel Sambuc   SourceLocation loc = locref;
1043f4a2713aSLionel Sambuc   if (!loc.isMacroID()) return false;
1044f4a2713aSLionel Sambuc 
1045f4a2713aSLionel Sambuc   // There's no good way right now to look at the intermediate
1046f4a2713aSLionel Sambuc   // expansions, so just jump to the expansion location.
1047f4a2713aSLionel Sambuc   loc = getSourceManager().getExpansionLoc(loc);
1048f4a2713aSLionel Sambuc 
1049f4a2713aSLionel Sambuc   // If that's written with the name, stop here.
1050f4a2713aSLionel Sambuc   SmallVector<char, 16> buffer;
1051f4a2713aSLionel Sambuc   if (getPreprocessor().getSpelling(loc, buffer) == name) {
1052f4a2713aSLionel Sambuc     locref = loc;
1053f4a2713aSLionel Sambuc     return true;
1054f4a2713aSLionel Sambuc   }
1055f4a2713aSLionel Sambuc   return false;
1056f4a2713aSLionel Sambuc }
1057f4a2713aSLionel Sambuc 
1058f4a2713aSLionel Sambuc /// \brief Determines the active Scope associated with the given declaration
1059f4a2713aSLionel Sambuc /// context.
1060f4a2713aSLionel Sambuc ///
1061f4a2713aSLionel Sambuc /// This routine maps a declaration context to the active Scope object that
1062f4a2713aSLionel Sambuc /// represents that declaration context in the parser. It is typically used
1063f4a2713aSLionel Sambuc /// from "scope-less" code (e.g., template instantiation, lazy creation of
1064f4a2713aSLionel Sambuc /// declarations) that injects a name for name-lookup purposes and, therefore,
1065f4a2713aSLionel Sambuc /// must update the Scope.
1066f4a2713aSLionel Sambuc ///
1067f4a2713aSLionel Sambuc /// \returns The scope corresponding to the given declaraion context, or NULL
1068f4a2713aSLionel Sambuc /// if no such scope is open.
getScopeForContext(DeclContext * Ctx)1069f4a2713aSLionel Sambuc Scope *Sema::getScopeForContext(DeclContext *Ctx) {
1070f4a2713aSLionel Sambuc 
1071f4a2713aSLionel Sambuc   if (!Ctx)
1072*0a6a1f1dSLionel Sambuc     return nullptr;
1073f4a2713aSLionel Sambuc 
1074f4a2713aSLionel Sambuc   Ctx = Ctx->getPrimaryContext();
1075f4a2713aSLionel Sambuc   for (Scope *S = getCurScope(); S; S = S->getParent()) {
1076f4a2713aSLionel Sambuc     // Ignore scopes that cannot have declarations. This is important for
1077f4a2713aSLionel Sambuc     // out-of-line definitions of static class members.
1078f4a2713aSLionel Sambuc     if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
1079f4a2713aSLionel Sambuc       if (DeclContext *Entity = S->getEntity())
1080f4a2713aSLionel Sambuc         if (Ctx == Entity->getPrimaryContext())
1081f4a2713aSLionel Sambuc           return S;
1082f4a2713aSLionel Sambuc   }
1083f4a2713aSLionel Sambuc 
1084*0a6a1f1dSLionel Sambuc   return nullptr;
1085f4a2713aSLionel Sambuc }
1086f4a2713aSLionel Sambuc 
1087f4a2713aSLionel Sambuc /// \brief Enter a new function scope
PushFunctionScope()1088f4a2713aSLionel Sambuc void Sema::PushFunctionScope() {
1089f4a2713aSLionel Sambuc   if (FunctionScopes.size() == 1) {
1090f4a2713aSLionel Sambuc     // Use the "top" function scope rather than having to allocate
1091f4a2713aSLionel Sambuc     // memory for a new scope.
1092f4a2713aSLionel Sambuc     FunctionScopes.back()->Clear();
1093f4a2713aSLionel Sambuc     FunctionScopes.push_back(FunctionScopes.back());
1094f4a2713aSLionel Sambuc     return;
1095f4a2713aSLionel Sambuc   }
1096f4a2713aSLionel Sambuc 
1097f4a2713aSLionel Sambuc   FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
1098f4a2713aSLionel Sambuc }
1099f4a2713aSLionel Sambuc 
PushBlockScope(Scope * BlockScope,BlockDecl * Block)1100f4a2713aSLionel Sambuc void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
1101f4a2713aSLionel Sambuc   FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
1102f4a2713aSLionel Sambuc                                               BlockScope, Block));
1103f4a2713aSLionel Sambuc }
1104f4a2713aSLionel Sambuc 
PushLambdaScope()1105f4a2713aSLionel Sambuc LambdaScopeInfo *Sema::PushLambdaScope() {
1106f4a2713aSLionel Sambuc   LambdaScopeInfo *const LSI = new LambdaScopeInfo(getDiagnostics());
1107f4a2713aSLionel Sambuc   FunctionScopes.push_back(LSI);
1108f4a2713aSLionel Sambuc   return LSI;
1109f4a2713aSLionel Sambuc }
1110f4a2713aSLionel Sambuc 
RecordParsingTemplateParameterDepth(unsigned Depth)1111f4a2713aSLionel Sambuc void Sema::RecordParsingTemplateParameterDepth(unsigned Depth) {
1112f4a2713aSLionel Sambuc   if (LambdaScopeInfo *const LSI = getCurLambda()) {
1113f4a2713aSLionel Sambuc     LSI->AutoTemplateParameterDepth = Depth;
1114f4a2713aSLionel Sambuc     return;
1115f4a2713aSLionel Sambuc   }
1116f4a2713aSLionel Sambuc   llvm_unreachable(
1117f4a2713aSLionel Sambuc       "Remove assertion if intentionally called in a non-lambda context.");
1118f4a2713aSLionel Sambuc }
1119f4a2713aSLionel Sambuc 
PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy * WP,const Decl * D,const BlockExpr * blkExpr)1120f4a2713aSLionel Sambuc void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
1121f4a2713aSLionel Sambuc                                 const Decl *D, const BlockExpr *blkExpr) {
1122f4a2713aSLionel Sambuc   FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
1123f4a2713aSLionel Sambuc   assert(!FunctionScopes.empty() && "mismatched push/pop!");
1124f4a2713aSLionel Sambuc 
1125f4a2713aSLionel Sambuc   // Issue any analysis-based warnings.
1126f4a2713aSLionel Sambuc   if (WP && D)
1127f4a2713aSLionel Sambuc     AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
1128*0a6a1f1dSLionel Sambuc   else
1129*0a6a1f1dSLionel Sambuc     for (const auto &PUD : Scope->PossiblyUnreachableDiags)
1130*0a6a1f1dSLionel Sambuc       Diag(PUD.Loc, PUD.PD);
1131f4a2713aSLionel Sambuc 
1132*0a6a1f1dSLionel Sambuc   if (FunctionScopes.back() != Scope)
1133f4a2713aSLionel Sambuc     delete Scope;
1134f4a2713aSLionel Sambuc }
1135f4a2713aSLionel Sambuc 
PushCompoundScope()1136f4a2713aSLionel Sambuc void Sema::PushCompoundScope() {
1137f4a2713aSLionel Sambuc   getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1138f4a2713aSLionel Sambuc }
1139f4a2713aSLionel Sambuc 
PopCompoundScope()1140f4a2713aSLionel Sambuc void Sema::PopCompoundScope() {
1141f4a2713aSLionel Sambuc   FunctionScopeInfo *CurFunction = getCurFunction();
1142f4a2713aSLionel Sambuc   assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1143f4a2713aSLionel Sambuc 
1144f4a2713aSLionel Sambuc   CurFunction->CompoundScopes.pop_back();
1145f4a2713aSLionel Sambuc }
1146f4a2713aSLionel Sambuc 
1147f4a2713aSLionel Sambuc /// \brief Determine whether any errors occurred within this function/method/
1148f4a2713aSLionel Sambuc /// block.
hasAnyUnrecoverableErrorsInThisFunction() const1149f4a2713aSLionel Sambuc bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1150f4a2713aSLionel Sambuc   return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
1151f4a2713aSLionel Sambuc }
1152f4a2713aSLionel Sambuc 
getCurBlock()1153f4a2713aSLionel Sambuc BlockScopeInfo *Sema::getCurBlock() {
1154f4a2713aSLionel Sambuc   if (FunctionScopes.empty())
1155*0a6a1f1dSLionel Sambuc     return nullptr;
1156f4a2713aSLionel Sambuc 
1157*0a6a1f1dSLionel Sambuc   auto CurBSI = dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1158*0a6a1f1dSLionel Sambuc   if (CurBSI && CurBSI->TheDecl &&
1159*0a6a1f1dSLionel Sambuc       !CurBSI->TheDecl->Encloses(CurContext)) {
1160*0a6a1f1dSLionel Sambuc     // We have switched contexts due to template instantiation.
1161*0a6a1f1dSLionel Sambuc     assert(!ActiveTemplateInstantiations.empty());
1162*0a6a1f1dSLionel Sambuc     return nullptr;
1163*0a6a1f1dSLionel Sambuc   }
1164*0a6a1f1dSLionel Sambuc 
1165*0a6a1f1dSLionel Sambuc   return CurBSI;
1166f4a2713aSLionel Sambuc }
1167f4a2713aSLionel Sambuc 
getCurLambda()1168f4a2713aSLionel Sambuc LambdaScopeInfo *Sema::getCurLambda() {
1169f4a2713aSLionel Sambuc   if (FunctionScopes.empty())
1170*0a6a1f1dSLionel Sambuc     return nullptr;
1171f4a2713aSLionel Sambuc 
1172*0a6a1f1dSLionel Sambuc   auto CurLSI = dyn_cast<LambdaScopeInfo>(FunctionScopes.back());
1173*0a6a1f1dSLionel Sambuc   if (CurLSI && CurLSI->Lambda &&
1174*0a6a1f1dSLionel Sambuc       !CurLSI->Lambda->Encloses(CurContext)) {
1175*0a6a1f1dSLionel Sambuc     // We have switched contexts due to template instantiation.
1176*0a6a1f1dSLionel Sambuc     assert(!ActiveTemplateInstantiations.empty());
1177*0a6a1f1dSLionel Sambuc     return nullptr;
1178*0a6a1f1dSLionel Sambuc   }
1179*0a6a1f1dSLionel Sambuc 
1180*0a6a1f1dSLionel Sambuc   return CurLSI;
1181f4a2713aSLionel Sambuc }
1182f4a2713aSLionel Sambuc // We have a generic lambda if we parsed auto parameters, or we have
1183f4a2713aSLionel Sambuc // an associated template parameter list.
getCurGenericLambda()1184f4a2713aSLionel Sambuc LambdaScopeInfo *Sema::getCurGenericLambda() {
1185f4a2713aSLionel Sambuc   if (LambdaScopeInfo *LSI =  getCurLambda()) {
1186f4a2713aSLionel Sambuc     return (LSI->AutoTemplateParams.size() ||
1187*0a6a1f1dSLionel Sambuc                     LSI->GLTemplateParameterList) ? LSI : nullptr;
1188f4a2713aSLionel Sambuc   }
1189*0a6a1f1dSLionel Sambuc   return nullptr;
1190f4a2713aSLionel Sambuc }
1191f4a2713aSLionel Sambuc 
1192f4a2713aSLionel Sambuc 
ActOnComment(SourceRange Comment)1193f4a2713aSLionel Sambuc void Sema::ActOnComment(SourceRange Comment) {
1194f4a2713aSLionel Sambuc   if (!LangOpts.RetainCommentsFromSystemHeaders &&
1195f4a2713aSLionel Sambuc       SourceMgr.isInSystemHeader(Comment.getBegin()))
1196f4a2713aSLionel Sambuc     return;
1197f4a2713aSLionel Sambuc   RawComment RC(SourceMgr, Comment, false,
1198f4a2713aSLionel Sambuc                 LangOpts.CommentOpts.ParseAllComments);
1199f4a2713aSLionel Sambuc   if (RC.isAlmostTrailingComment()) {
1200f4a2713aSLionel Sambuc     SourceRange MagicMarkerRange(Comment.getBegin(),
1201f4a2713aSLionel Sambuc                                  Comment.getBegin().getLocWithOffset(3));
1202f4a2713aSLionel Sambuc     StringRef MagicMarkerText;
1203f4a2713aSLionel Sambuc     switch (RC.getKind()) {
1204f4a2713aSLionel Sambuc     case RawComment::RCK_OrdinaryBCPL:
1205f4a2713aSLionel Sambuc       MagicMarkerText = "///<";
1206f4a2713aSLionel Sambuc       break;
1207f4a2713aSLionel Sambuc     case RawComment::RCK_OrdinaryC:
1208f4a2713aSLionel Sambuc       MagicMarkerText = "/**<";
1209f4a2713aSLionel Sambuc       break;
1210f4a2713aSLionel Sambuc     default:
1211f4a2713aSLionel Sambuc       llvm_unreachable("if this is an almost Doxygen comment, "
1212f4a2713aSLionel Sambuc                        "it should be ordinary");
1213f4a2713aSLionel Sambuc     }
1214f4a2713aSLionel Sambuc     Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1215f4a2713aSLionel Sambuc       FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1216f4a2713aSLionel Sambuc   }
1217f4a2713aSLionel Sambuc   Context.addComment(RC);
1218f4a2713aSLionel Sambuc }
1219f4a2713aSLionel Sambuc 
1220f4a2713aSLionel Sambuc // Pin this vtable to this file.
~ExternalSemaSource()1221f4a2713aSLionel Sambuc ExternalSemaSource::~ExternalSemaSource() {}
1222f4a2713aSLionel Sambuc 
ReadMethodPool(Selector Sel)1223f4a2713aSLionel Sambuc void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
1224f4a2713aSLionel Sambuc 
ReadKnownNamespaces(SmallVectorImpl<NamespaceDecl * > & Namespaces)1225f4a2713aSLionel Sambuc void ExternalSemaSource::ReadKnownNamespaces(
1226f4a2713aSLionel Sambuc                            SmallVectorImpl<NamespaceDecl *> &Namespaces) {
1227f4a2713aSLionel Sambuc }
1228f4a2713aSLionel Sambuc 
ReadUndefinedButUsed(llvm::DenseMap<NamedDecl *,SourceLocation> & Undefined)1229f4a2713aSLionel Sambuc void ExternalSemaSource::ReadUndefinedButUsed(
1230f4a2713aSLionel Sambuc                        llvm::DenseMap<NamedDecl *, SourceLocation> &Undefined) {
1231f4a2713aSLionel Sambuc }
1232f4a2713aSLionel Sambuc 
print(raw_ostream & OS) const1233f4a2713aSLionel Sambuc void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
1234f4a2713aSLionel Sambuc   SourceLocation Loc = this->Loc;
1235f4a2713aSLionel Sambuc   if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1236f4a2713aSLionel Sambuc   if (Loc.isValid()) {
1237f4a2713aSLionel Sambuc     Loc.print(OS, S.getSourceManager());
1238f4a2713aSLionel Sambuc     OS << ": ";
1239f4a2713aSLionel Sambuc   }
1240f4a2713aSLionel Sambuc   OS << Message;
1241f4a2713aSLionel Sambuc 
1242f4a2713aSLionel Sambuc   if (TheDecl && isa<NamedDecl>(TheDecl)) {
1243f4a2713aSLionel Sambuc     std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
1244f4a2713aSLionel Sambuc     if (!Name.empty())
1245f4a2713aSLionel Sambuc       OS << " '" << Name << '\'';
1246f4a2713aSLionel Sambuc   }
1247f4a2713aSLionel Sambuc 
1248f4a2713aSLionel Sambuc   OS << '\n';
1249f4a2713aSLionel Sambuc }
1250f4a2713aSLionel Sambuc 
1251f4a2713aSLionel Sambuc /// \brief Figure out if an expression could be turned into a call.
1252f4a2713aSLionel Sambuc ///
1253f4a2713aSLionel Sambuc /// Use this when trying to recover from an error where the programmer may have
1254f4a2713aSLionel Sambuc /// written just the name of a function instead of actually calling it.
1255f4a2713aSLionel Sambuc ///
1256f4a2713aSLionel Sambuc /// \param E - The expression to examine.
1257f4a2713aSLionel Sambuc /// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1258f4a2713aSLionel Sambuc ///  with no arguments, this parameter is set to the type returned by such a
1259f4a2713aSLionel Sambuc ///  call; otherwise, it is set to an empty QualType.
1260f4a2713aSLionel Sambuc /// \param OverloadSet - If the expression is an overloaded function
1261f4a2713aSLionel Sambuc ///  name, this parameter is populated with the decls of the various overloads.
tryExprAsCall(Expr & E,QualType & ZeroArgCallReturnTy,UnresolvedSetImpl & OverloadSet)1262f4a2713aSLionel Sambuc bool Sema::tryExprAsCall(Expr &E, QualType &ZeroArgCallReturnTy,
1263f4a2713aSLionel Sambuc                          UnresolvedSetImpl &OverloadSet) {
1264f4a2713aSLionel Sambuc   ZeroArgCallReturnTy = QualType();
1265f4a2713aSLionel Sambuc   OverloadSet.clear();
1266f4a2713aSLionel Sambuc 
1267*0a6a1f1dSLionel Sambuc   const OverloadExpr *Overloads = nullptr;
1268f4a2713aSLionel Sambuc   bool IsMemExpr = false;
1269f4a2713aSLionel Sambuc   if (E.getType() == Context.OverloadTy) {
1270f4a2713aSLionel Sambuc     OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1271f4a2713aSLionel Sambuc 
1272f4a2713aSLionel Sambuc     // Ignore overloads that are pointer-to-member constants.
1273f4a2713aSLionel Sambuc     if (FR.HasFormOfMemberPointer)
1274f4a2713aSLionel Sambuc       return false;
1275f4a2713aSLionel Sambuc 
1276f4a2713aSLionel Sambuc     Overloads = FR.Expression;
1277f4a2713aSLionel Sambuc   } else if (E.getType() == Context.BoundMemberTy) {
1278f4a2713aSLionel Sambuc     Overloads = dyn_cast<UnresolvedMemberExpr>(E.IgnoreParens());
1279f4a2713aSLionel Sambuc     IsMemExpr = true;
1280f4a2713aSLionel Sambuc   }
1281f4a2713aSLionel Sambuc 
1282f4a2713aSLionel Sambuc   bool Ambiguous = false;
1283f4a2713aSLionel Sambuc 
1284f4a2713aSLionel Sambuc   if (Overloads) {
1285f4a2713aSLionel Sambuc     for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1286f4a2713aSLionel Sambuc          DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
1287f4a2713aSLionel Sambuc       OverloadSet.addDecl(*it);
1288f4a2713aSLionel Sambuc 
1289f4a2713aSLionel Sambuc       // Check whether the function is a non-template, non-member which takes no
1290f4a2713aSLionel Sambuc       // arguments.
1291f4a2713aSLionel Sambuc       if (IsMemExpr)
1292f4a2713aSLionel Sambuc         continue;
1293f4a2713aSLionel Sambuc       if (const FunctionDecl *OverloadDecl
1294f4a2713aSLionel Sambuc             = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
1295f4a2713aSLionel Sambuc         if (OverloadDecl->getMinRequiredArguments() == 0) {
1296f4a2713aSLionel Sambuc           if (!ZeroArgCallReturnTy.isNull() && !Ambiguous) {
1297f4a2713aSLionel Sambuc             ZeroArgCallReturnTy = QualType();
1298f4a2713aSLionel Sambuc             Ambiguous = true;
1299f4a2713aSLionel Sambuc           } else
1300*0a6a1f1dSLionel Sambuc             ZeroArgCallReturnTy = OverloadDecl->getReturnType();
1301f4a2713aSLionel Sambuc         }
1302f4a2713aSLionel Sambuc       }
1303f4a2713aSLionel Sambuc     }
1304f4a2713aSLionel Sambuc 
1305f4a2713aSLionel Sambuc     // If it's not a member, use better machinery to try to resolve the call
1306f4a2713aSLionel Sambuc     if (!IsMemExpr)
1307f4a2713aSLionel Sambuc       return !ZeroArgCallReturnTy.isNull();
1308f4a2713aSLionel Sambuc   }
1309f4a2713aSLionel Sambuc 
1310f4a2713aSLionel Sambuc   // Attempt to call the member with no arguments - this will correctly handle
1311f4a2713aSLionel Sambuc   // member templates with defaults/deduction of template arguments, overloads
1312f4a2713aSLionel Sambuc   // with default arguments, etc.
1313f4a2713aSLionel Sambuc   if (IsMemExpr && !E.isTypeDependent()) {
1314f4a2713aSLionel Sambuc     bool Suppress = getDiagnostics().getSuppressAllDiagnostics();
1315f4a2713aSLionel Sambuc     getDiagnostics().setSuppressAllDiagnostics(true);
1316*0a6a1f1dSLionel Sambuc     ExprResult R = BuildCallToMemberFunction(nullptr, &E, SourceLocation(),
1317*0a6a1f1dSLionel Sambuc                                              None, SourceLocation());
1318f4a2713aSLionel Sambuc     getDiagnostics().setSuppressAllDiagnostics(Suppress);
1319f4a2713aSLionel Sambuc     if (R.isUsable()) {
1320f4a2713aSLionel Sambuc       ZeroArgCallReturnTy = R.get()->getType();
1321f4a2713aSLionel Sambuc       return true;
1322f4a2713aSLionel Sambuc     }
1323f4a2713aSLionel Sambuc     return false;
1324f4a2713aSLionel Sambuc   }
1325f4a2713aSLionel Sambuc 
1326f4a2713aSLionel Sambuc   if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
1327f4a2713aSLionel Sambuc     if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1328f4a2713aSLionel Sambuc       if (Fun->getMinRequiredArguments() == 0)
1329*0a6a1f1dSLionel Sambuc         ZeroArgCallReturnTy = Fun->getReturnType();
1330f4a2713aSLionel Sambuc       return true;
1331f4a2713aSLionel Sambuc     }
1332f4a2713aSLionel Sambuc   }
1333f4a2713aSLionel Sambuc 
1334f4a2713aSLionel Sambuc   // We don't have an expression that's convenient to get a FunctionDecl from,
1335f4a2713aSLionel Sambuc   // but we can at least check if the type is "function of 0 arguments".
1336f4a2713aSLionel Sambuc   QualType ExprTy = E.getType();
1337*0a6a1f1dSLionel Sambuc   const FunctionType *FunTy = nullptr;
1338f4a2713aSLionel Sambuc   QualType PointeeTy = ExprTy->getPointeeType();
1339f4a2713aSLionel Sambuc   if (!PointeeTy.isNull())
1340f4a2713aSLionel Sambuc     FunTy = PointeeTy->getAs<FunctionType>();
1341f4a2713aSLionel Sambuc   if (!FunTy)
1342f4a2713aSLionel Sambuc     FunTy = ExprTy->getAs<FunctionType>();
1343f4a2713aSLionel Sambuc 
1344f4a2713aSLionel Sambuc   if (const FunctionProtoType *FPT =
1345f4a2713aSLionel Sambuc       dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1346*0a6a1f1dSLionel Sambuc     if (FPT->getNumParams() == 0)
1347*0a6a1f1dSLionel Sambuc       ZeroArgCallReturnTy = FunTy->getReturnType();
1348f4a2713aSLionel Sambuc     return true;
1349f4a2713aSLionel Sambuc   }
1350f4a2713aSLionel Sambuc   return false;
1351f4a2713aSLionel Sambuc }
1352f4a2713aSLionel Sambuc 
1353f4a2713aSLionel Sambuc /// \brief Give notes for a set of overloads.
1354f4a2713aSLionel Sambuc ///
1355f4a2713aSLionel Sambuc /// A companion to tryExprAsCall. In cases when the name that the programmer
1356f4a2713aSLionel Sambuc /// wrote was an overloaded function, we may be able to make some guesses about
1357f4a2713aSLionel Sambuc /// plausible overloads based on their return types; such guesses can be handed
1358f4a2713aSLionel Sambuc /// off to this method to be emitted as notes.
1359f4a2713aSLionel Sambuc ///
1360f4a2713aSLionel Sambuc /// \param Overloads - The overloads to note.
1361f4a2713aSLionel Sambuc /// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1362f4a2713aSLionel Sambuc ///  -fshow-overloads=best, this is the location to attach to the note about too
1363f4a2713aSLionel Sambuc ///  many candidates. Typically this will be the location of the original
1364f4a2713aSLionel Sambuc ///  ill-formed expression.
noteOverloads(Sema & S,const UnresolvedSetImpl & Overloads,const SourceLocation FinalNoteLoc)1365f4a2713aSLionel Sambuc static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1366f4a2713aSLionel Sambuc                           const SourceLocation FinalNoteLoc) {
1367f4a2713aSLionel Sambuc   int ShownOverloads = 0;
1368f4a2713aSLionel Sambuc   int SuppressedOverloads = 0;
1369f4a2713aSLionel Sambuc   for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1370f4a2713aSLionel Sambuc        DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1371f4a2713aSLionel Sambuc     // FIXME: Magic number for max shown overloads stolen from
1372f4a2713aSLionel Sambuc     // OverloadCandidateSet::NoteCandidates.
1373f4a2713aSLionel Sambuc     if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
1374f4a2713aSLionel Sambuc       ++SuppressedOverloads;
1375f4a2713aSLionel Sambuc       continue;
1376f4a2713aSLionel Sambuc     }
1377f4a2713aSLionel Sambuc 
1378f4a2713aSLionel Sambuc     NamedDecl *Fn = (*It)->getUnderlyingDecl();
1379f4a2713aSLionel Sambuc     S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
1380f4a2713aSLionel Sambuc     ++ShownOverloads;
1381f4a2713aSLionel Sambuc   }
1382f4a2713aSLionel Sambuc 
1383f4a2713aSLionel Sambuc   if (SuppressedOverloads)
1384f4a2713aSLionel Sambuc     S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1385f4a2713aSLionel Sambuc       << SuppressedOverloads;
1386f4a2713aSLionel Sambuc }
1387f4a2713aSLionel Sambuc 
notePlausibleOverloads(Sema & S,SourceLocation Loc,const UnresolvedSetImpl & Overloads,bool (* IsPlausibleResult)(QualType))1388f4a2713aSLionel Sambuc static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1389f4a2713aSLionel Sambuc                                    const UnresolvedSetImpl &Overloads,
1390f4a2713aSLionel Sambuc                                    bool (*IsPlausibleResult)(QualType)) {
1391f4a2713aSLionel Sambuc   if (!IsPlausibleResult)
1392f4a2713aSLionel Sambuc     return noteOverloads(S, Overloads, Loc);
1393f4a2713aSLionel Sambuc 
1394f4a2713aSLionel Sambuc   UnresolvedSet<2> PlausibleOverloads;
1395f4a2713aSLionel Sambuc   for (OverloadExpr::decls_iterator It = Overloads.begin(),
1396f4a2713aSLionel Sambuc          DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1397f4a2713aSLionel Sambuc     const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1398*0a6a1f1dSLionel Sambuc     QualType OverloadResultTy = OverloadDecl->getReturnType();
1399f4a2713aSLionel Sambuc     if (IsPlausibleResult(OverloadResultTy))
1400f4a2713aSLionel Sambuc       PlausibleOverloads.addDecl(It.getDecl());
1401f4a2713aSLionel Sambuc   }
1402f4a2713aSLionel Sambuc   noteOverloads(S, PlausibleOverloads, Loc);
1403f4a2713aSLionel Sambuc }
1404f4a2713aSLionel Sambuc 
1405f4a2713aSLionel Sambuc /// Determine whether the given expression can be called by just
1406f4a2713aSLionel Sambuc /// putting parentheses after it.  Notably, expressions with unary
1407f4a2713aSLionel Sambuc /// operators can't be because the unary operator will start parsing
1408f4a2713aSLionel Sambuc /// outside the call.
IsCallableWithAppend(Expr * E)1409f4a2713aSLionel Sambuc static bool IsCallableWithAppend(Expr *E) {
1410f4a2713aSLionel Sambuc   E = E->IgnoreImplicit();
1411f4a2713aSLionel Sambuc   return (!isa<CStyleCastExpr>(E) &&
1412f4a2713aSLionel Sambuc           !isa<UnaryOperator>(E) &&
1413f4a2713aSLionel Sambuc           !isa<BinaryOperator>(E) &&
1414f4a2713aSLionel Sambuc           !isa<CXXOperatorCallExpr>(E));
1415f4a2713aSLionel Sambuc }
1416f4a2713aSLionel Sambuc 
tryToRecoverWithCall(ExprResult & E,const PartialDiagnostic & PD,bool ForceComplain,bool (* IsPlausibleResult)(QualType))1417f4a2713aSLionel Sambuc bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1418f4a2713aSLionel Sambuc                                 bool ForceComplain,
1419f4a2713aSLionel Sambuc                                 bool (*IsPlausibleResult)(QualType)) {
1420f4a2713aSLionel Sambuc   SourceLocation Loc = E.get()->getExprLoc();
1421f4a2713aSLionel Sambuc   SourceRange Range = E.get()->getSourceRange();
1422f4a2713aSLionel Sambuc 
1423f4a2713aSLionel Sambuc   QualType ZeroArgCallTy;
1424f4a2713aSLionel Sambuc   UnresolvedSet<4> Overloads;
1425f4a2713aSLionel Sambuc   if (tryExprAsCall(*E.get(), ZeroArgCallTy, Overloads) &&
1426f4a2713aSLionel Sambuc       !ZeroArgCallTy.isNull() &&
1427f4a2713aSLionel Sambuc       (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1428f4a2713aSLionel Sambuc     // At this point, we know E is potentially callable with 0
1429f4a2713aSLionel Sambuc     // arguments and that it returns something of a reasonable type,
1430f4a2713aSLionel Sambuc     // so we can emit a fixit and carry on pretending that E was
1431f4a2713aSLionel Sambuc     // actually a CallExpr.
1432f4a2713aSLionel Sambuc     SourceLocation ParenInsertionLoc = PP.getLocForEndOfToken(Range.getEnd());
1433f4a2713aSLionel Sambuc     Diag(Loc, PD)
1434f4a2713aSLionel Sambuc       << /*zero-arg*/ 1 << Range
1435f4a2713aSLionel Sambuc       << (IsCallableWithAppend(E.get())
1436f4a2713aSLionel Sambuc           ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1437f4a2713aSLionel Sambuc           : FixItHint());
1438f4a2713aSLionel Sambuc     notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1439f4a2713aSLionel Sambuc 
1440f4a2713aSLionel Sambuc     // FIXME: Try this before emitting the fixit, and suppress diagnostics
1441f4a2713aSLionel Sambuc     // while doing so.
1442*0a6a1f1dSLionel Sambuc     E = ActOnCallExpr(nullptr, E.get(), Range.getEnd(), None,
1443f4a2713aSLionel Sambuc                       Range.getEnd().getLocWithOffset(1));
1444f4a2713aSLionel Sambuc     return true;
1445f4a2713aSLionel Sambuc   }
1446f4a2713aSLionel Sambuc 
1447f4a2713aSLionel Sambuc   if (!ForceComplain) return false;
1448f4a2713aSLionel Sambuc 
1449f4a2713aSLionel Sambuc   Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1450f4a2713aSLionel Sambuc   notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1451f4a2713aSLionel Sambuc   E = ExprError();
1452f4a2713aSLionel Sambuc   return true;
1453f4a2713aSLionel Sambuc }
1454f4a2713aSLionel Sambuc 
getSuperIdentifier() const1455f4a2713aSLionel Sambuc IdentifierInfo *Sema::getSuperIdentifier() const {
1456f4a2713aSLionel Sambuc   if (!Ident_super)
1457f4a2713aSLionel Sambuc     Ident_super = &Context.Idents.get("super");
1458f4a2713aSLionel Sambuc   return Ident_super;
1459f4a2713aSLionel Sambuc }
1460f4a2713aSLionel Sambuc 
getFloat128Identifier() const1461f4a2713aSLionel Sambuc IdentifierInfo *Sema::getFloat128Identifier() const {
1462f4a2713aSLionel Sambuc   if (!Ident___float128)
1463f4a2713aSLionel Sambuc     Ident___float128 = &Context.Idents.get("__float128");
1464f4a2713aSLionel Sambuc   return Ident___float128;
1465f4a2713aSLionel Sambuc }
1466f4a2713aSLionel Sambuc 
PushCapturedRegionScope(Scope * S,CapturedDecl * CD,RecordDecl * RD,CapturedRegionKind K)1467f4a2713aSLionel Sambuc void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
1468f4a2713aSLionel Sambuc                                    CapturedRegionKind K) {
1469*0a6a1f1dSLionel Sambuc   CapturingScopeInfo *CSI = new CapturedRegionScopeInfo(
1470*0a6a1f1dSLionel Sambuc       getDiagnostics(), S, CD, RD, CD->getContextParam(), K);
1471f4a2713aSLionel Sambuc   CSI->ReturnType = Context.VoidTy;
1472f4a2713aSLionel Sambuc   FunctionScopes.push_back(CSI);
1473f4a2713aSLionel Sambuc }
1474f4a2713aSLionel Sambuc 
getCurCapturedRegion()1475f4a2713aSLionel Sambuc CapturedRegionScopeInfo *Sema::getCurCapturedRegion() {
1476f4a2713aSLionel Sambuc   if (FunctionScopes.empty())
1477*0a6a1f1dSLionel Sambuc     return nullptr;
1478f4a2713aSLionel Sambuc 
1479f4a2713aSLionel Sambuc   return dyn_cast<CapturedRegionScopeInfo>(FunctionScopes.back());
1480f4a2713aSLionel Sambuc }
1481