forked from OSchip/llvm-project
421 lines
16 KiB
C++
421 lines
16 KiB
C++
//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the actions class which performs semantic analysis and
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// builds an AST out of a parse stream.
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//
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//===----------------------------------------------------------------------===//
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#include "Sema.h"
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#include "llvm/ADT/DenseMap.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Expr.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Basic/PartialDiagnostic.h"
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#include "clang/Basic/TargetInfo.h"
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using namespace clang;
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/// ConvertQualTypeToStringFn - This function is used to pretty print the
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/// specified QualType as a string in diagnostics.
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static void ConvertArgToStringFn(Diagnostic::ArgumentKind Kind, intptr_t Val,
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const char *Modifier, unsigned ModLen,
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const char *Argument, unsigned ArgLen,
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llvm::SmallVectorImpl<char> &Output,
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void *Cookie) {
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ASTContext &Context = *static_cast<ASTContext*>(Cookie);
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std::string S;
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if (Kind == Diagnostic::ak_qualtype) {
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assert(ModLen == 0 && ArgLen == 0 &&
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"Invalid modifier for QualType argument");
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QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val)));
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// FIXME: Playing with std::string is really slow.
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S = Ty.getAsString(Context.PrintingPolicy);
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// If this is a sugared type (like a typedef, typeof, etc), then unwrap one
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// level of the sugar so that the type is more obvious to the user.
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QualType DesugaredTy = Ty.getDesugaredType();
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if (Ty != DesugaredTy &&
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// If the desugared type is a vector type, we don't want to expand it,
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// it will turn into an attribute mess. People want their "vec4".
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!isa<VectorType>(DesugaredTy) &&
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// Don't aka just because we saw an elaborated type...
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(!isa<ElaboratedType>(Ty) ||
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cast<ElaboratedType>(Ty)->desugar() != DesugaredTy) &&
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// ...or a qualified name type...
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(!isa<QualifiedNameType>(Ty) ||
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cast<QualifiedNameType>(Ty)->desugar() != DesugaredTy) &&
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// ...or a non-dependent template specialization.
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(!isa<TemplateSpecializationType>(Ty) || Ty->isDependentType()) &&
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// Don't desugar magic Objective-C types.
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Ty.getUnqualifiedType() != Context.getObjCIdType() &&
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Ty.getUnqualifiedType() != Context.getObjCClassType() &&
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Ty.getUnqualifiedType() != Context.getObjCSelType() &&
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Ty.getUnqualifiedType() != Context.getObjCProtoType() &&
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// Not va_list.
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Ty.getUnqualifiedType() != Context.getBuiltinVaListType()) {
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S = "'"+S+"' (aka '";
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S += DesugaredTy.getAsString(Context.PrintingPolicy);
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S += "')";
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Output.append(S.begin(), S.end());
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return;
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}
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} else if (Kind == Diagnostic::ak_declarationname) {
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DeclarationName N = DeclarationName::getFromOpaqueInteger(Val);
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S = N.getAsString();
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if (ModLen == 9 && !memcmp(Modifier, "objcclass", 9) && ArgLen == 0)
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S = '+' + S;
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else if (ModLen == 12 && !memcmp(Modifier, "objcinstance", 12) && ArgLen==0)
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S = '-' + S;
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else
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assert(ModLen == 0 && ArgLen == 0 &&
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"Invalid modifier for DeclarationName argument");
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} else if (Kind == Diagnostic::ak_nameddecl) {
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bool Qualified;
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if (ModLen == 1 && Modifier[0] == 'q' && ArgLen == 0)
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Qualified = true;
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else {
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assert(ModLen == 0 && ArgLen == 0 &&
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"Invalid modifier for NamedDecl* argument");
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Qualified = false;
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}
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reinterpret_cast<NamedDecl*>(Val)->getNameForDiagnostic(S,
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Context.PrintingPolicy,
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Qualified);
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} else {
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llvm::raw_string_ostream OS(S);
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assert(Kind == Diagnostic::ak_nestednamespec);
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reinterpret_cast<NestedNameSpecifier*> (Val)->print(OS,
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Context.PrintingPolicy);
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}
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Output.push_back('\'');
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Output.append(S.begin(), S.end());
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Output.push_back('\'');
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}
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static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) {
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if (C.getLangOptions().CPlusPlus)
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return CXXRecordDecl::Create(C, TagDecl::TK_struct,
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C.getTranslationUnitDecl(),
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SourceLocation(), &C.Idents.get(Name));
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return RecordDecl::Create(C, TagDecl::TK_struct,
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C.getTranslationUnitDecl(),
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SourceLocation(), &C.Idents.get(Name));
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}
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void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
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TUScope = S;
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PushDeclContext(S, Context.getTranslationUnitDecl());
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if (PP.getTargetInfo().getPointerWidth(0) >= 64) {
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// Install [u]int128_t for 64-bit targets.
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PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
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SourceLocation(),
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&Context.Idents.get("__int128_t"),
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Context.Int128Ty), TUScope);
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PushOnScopeChains(TypedefDecl::Create(Context, CurContext,
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SourceLocation(),
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&Context.Idents.get("__uint128_t"),
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Context.UnsignedInt128Ty), TUScope);
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}
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if (!PP.getLangOptions().ObjC1) return;
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// Built-in ObjC types may already be set by PCHReader (hence isNull checks).
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if (Context.getObjCSelType().isNull()) {
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// Synthesize "typedef struct objc_selector *SEL;"
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RecordDecl *SelTag = CreateStructDecl(Context, "objc_selector");
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PushOnScopeChains(SelTag, TUScope);
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QualType SelT = Context.getPointerType(Context.getTagDeclType(SelTag));
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TypedefDecl *SelTypedef = TypedefDecl::Create(Context, CurContext,
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SourceLocation(),
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&Context.Idents.get("SEL"),
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SelT);
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PushOnScopeChains(SelTypedef, TUScope);
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Context.setObjCSelType(Context.getTypeDeclType(SelTypedef));
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}
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// Synthesize "@class Protocol;
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if (Context.getObjCProtoType().isNull()) {
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ObjCInterfaceDecl *ProtocolDecl =
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ObjCInterfaceDecl::Create(Context, CurContext, SourceLocation(),
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&Context.Idents.get("Protocol"),
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SourceLocation(), true);
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Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
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PushOnScopeChains(ProtocolDecl, TUScope);
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}
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// Create the built-in typedef for 'id'.
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if (Context.getObjCIdType().isNull()) {
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TypedefDecl *IdTypedef =
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TypedefDecl::Create(
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Context, CurContext, SourceLocation(), &Context.Idents.get("id"),
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Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy)
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);
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PushOnScopeChains(IdTypedef, TUScope);
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Context.setObjCIdType(Context.getTypeDeclType(IdTypedef));
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Context.ObjCIdRedefinitionType = Context.getObjCIdType();
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}
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// Create the built-in typedef for 'Class'.
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if (Context.getObjCClassType().isNull()) {
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TypedefDecl *ClassTypedef =
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TypedefDecl::Create(
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Context, CurContext, SourceLocation(), &Context.Idents.get("Class"),
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Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy)
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);
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PushOnScopeChains(ClassTypedef, TUScope);
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Context.setObjCClassType(Context.getTypeDeclType(ClassTypedef));
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Context.ObjCClassRedefinitionType = Context.getObjCClassType();
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}
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}
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Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
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bool CompleteTranslationUnit)
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: LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer),
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Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
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ExternalSource(0), CodeCompleter(0), CurContext(0),
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PreDeclaratorDC(0), CurBlock(0), PackContext(0),
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IdResolver(pp.getLangOptions()), StdNamespace(0), StdBadAlloc(0),
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GlobalNewDeleteDeclared(false), ExprEvalContext(PotentiallyEvaluated),
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CompleteTranslationUnit(CompleteTranslationUnit),
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NumSFINAEErrors(0), CurrentInstantiationScope(0) {
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TUScope = 0;
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if (getLangOptions().CPlusPlus)
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FieldCollector.reset(new CXXFieldCollector());
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// Tell diagnostics how to render things from the AST library.
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PP.getDiagnostics().SetArgToStringFn(ConvertArgToStringFn, &Context);
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}
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/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
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/// If there is already an implicit cast, merge into the existing one.
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/// If isLvalue, the result of the cast is an lvalue.
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void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty,
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CastExpr::CastKind Kind, bool isLvalue) {
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QualType ExprTy = Context.getCanonicalType(Expr->getType());
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QualType TypeTy = Context.getCanonicalType(Ty);
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if (ExprTy == TypeTy)
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return;
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if (Expr->getType().getTypePtr()->isPointerType() &&
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Ty.getTypePtr()->isPointerType()) {
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QualType ExprBaseType =
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cast<PointerType>(ExprTy.getUnqualifiedType())->getPointeeType();
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QualType BaseType =
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cast<PointerType>(TypeTy.getUnqualifiedType())->getPointeeType();
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if (ExprBaseType.getAddressSpace() != BaseType.getAddressSpace()) {
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Diag(Expr->getExprLoc(), diag::err_implicit_pointer_address_space_cast)
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<< Expr->getSourceRange();
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}
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}
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if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) {
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if (ImpCast->getCastKind() == Kind) {
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ImpCast->setType(Ty);
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ImpCast->setLvalueCast(isLvalue);
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return;
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}
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}
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Expr = new (Context) ImplicitCastExpr(Ty, Kind, Expr, isLvalue);
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}
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void Sema::DeleteExpr(ExprTy *E) {
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if (E) static_cast<Expr*>(E)->Destroy(Context);
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}
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void Sema::DeleteStmt(StmtTy *S) {
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if (S) static_cast<Stmt*>(S)->Destroy(Context);
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}
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/// ActOnEndOfTranslationUnit - This is called at the very end of the
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/// translation unit when EOF is reached and all but the top-level scope is
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/// popped.
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void Sema::ActOnEndOfTranslationUnit() {
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// C++: Perform implicit template instantiations.
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//
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// FIXME: When we perform these implicit instantiations, we do not carefully
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// keep track of the point of instantiation (C++ [temp.point]). This means
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// that name lookup that occurs within the template instantiation will
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// always happen at the end of the translation unit, so it will find
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// some names that should not be found. Although this is common behavior
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// for C++ compilers, it is technically wrong. In the future, we either need
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// to be able to filter the results of name lookup or we need to perform
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// template instantiations earlier.
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PerformPendingImplicitInstantiations();
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// Check for #pragma weak identifiers that were never declared
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// FIXME: This will cause diagnostics to be emitted in a non-determinstic
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// order! Iterating over a densemap like this is bad.
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for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
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I = WeakUndeclaredIdentifiers.begin(),
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E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
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if (I->second.getUsed()) continue;
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Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
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<< I->first;
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}
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if (!CompleteTranslationUnit)
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return;
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// C99 6.9.2p2:
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// A declaration of an identifier for an object that has file
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// scope without an initializer, and without a storage-class
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// specifier or with the storage-class specifier static,
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// constitutes a tentative definition. If a translation unit
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// contains one or more tentative definitions for an identifier,
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// and the translation unit contains no external definition for
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// that identifier, then the behavior is exactly as if the
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// translation unit contains a file scope declaration of that
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// identifier, with the composite type as of the end of the
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// translation unit, with an initializer equal to 0.
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for (unsigned i = 0, e = TentativeDefinitionList.size(); i != e; ++i) {
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VarDecl *VD = TentativeDefinitions.lookup(TentativeDefinitionList[i]);
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// If the tentative definition was completed, it will be in the list, but
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// not the map.
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if (VD == 0 || VD->isInvalidDecl() || !VD->isTentativeDefinition(Context))
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continue;
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if (const IncompleteArrayType *ArrayT
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= Context.getAsIncompleteArrayType(VD->getType())) {
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if (RequireCompleteType(VD->getLocation(),
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ArrayT->getElementType(),
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diag::err_tentative_def_incomplete_type_arr)) {
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VD->setInvalidDecl();
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continue;
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}
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// Set the length of the array to 1 (C99 6.9.2p5).
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Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
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llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
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QualType T
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= Context.getConstantArrayWithoutExprType(ArrayT->getElementType(),
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One, ArrayType::Normal, 0);
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VD->setType(T);
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} else if (RequireCompleteType(VD->getLocation(), VD->getType(),
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diag::err_tentative_def_incomplete_type))
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VD->setInvalidDecl();
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// Notify the consumer that we've completed a tentative definition.
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if (!VD->isInvalidDecl())
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Consumer.CompleteTentativeDefinition(VD);
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}
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}
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//===----------------------------------------------------------------------===//
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// Helper functions.
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//===----------------------------------------------------------------------===//
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DeclContext *Sema::getFunctionLevelDeclContext() {
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DeclContext *DC = PreDeclaratorDC ? PreDeclaratorDC : CurContext;
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while (isa<BlockDecl>(DC))
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DC = DC->getParent();
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return DC;
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}
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/// getCurFunctionDecl - If inside of a function body, this returns a pointer
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/// to the function decl for the function being parsed. If we're currently
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/// in a 'block', this returns the containing context.
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FunctionDecl *Sema::getCurFunctionDecl() {
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DeclContext *DC = getFunctionLevelDeclContext();
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return dyn_cast<FunctionDecl>(DC);
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}
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ObjCMethodDecl *Sema::getCurMethodDecl() {
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DeclContext *DC = getFunctionLevelDeclContext();
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return dyn_cast<ObjCMethodDecl>(DC);
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}
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NamedDecl *Sema::getCurFunctionOrMethodDecl() {
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DeclContext *DC = getFunctionLevelDeclContext();
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if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
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return cast<NamedDecl>(DC);
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return 0;
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}
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void Sema::DiagnoseMissingMember(SourceLocation MemberLoc,
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DeclarationName Member,
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NestedNameSpecifier *NNS, SourceRange Range) {
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switch (NNS->getKind()) {
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default: assert(0 && "Unexpected nested name specifier kind!");
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case NestedNameSpecifier::TypeSpec: {
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const Type *Ty = Context.getCanonicalType(NNS->getAsType());
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RecordDecl *RD = cast<RecordType>(Ty)->getDecl();
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Diag(MemberLoc, diag::err_typecheck_record_no_member)
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<< Member << RD->getTagKind() << RD << Range;
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break;
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}
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case NestedNameSpecifier::Namespace: {
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Diag(MemberLoc, diag::err_typecheck_namespace_no_member)
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<< Member << NNS->getAsNamespace() << Range;
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break;
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}
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case NestedNameSpecifier::Global: {
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Diag(MemberLoc, diag::err_typecheck_global_namespace_no_member)
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<< Member << Range;
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break;
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}
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}
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}
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Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
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if (!this->Emit())
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return;
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// If this is not a note, and we're in a template instantiation
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// that is different from the last template instantiation where
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// we emitted an error, print a template instantiation
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// backtrace.
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if (!SemaRef.Diags.isBuiltinNote(DiagID) &&
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!SemaRef.ActiveTemplateInstantiations.empty() &&
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SemaRef.ActiveTemplateInstantiations.back()
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!= SemaRef.LastTemplateInstantiationErrorContext) {
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SemaRef.PrintInstantiationStack();
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SemaRef.LastTemplateInstantiationErrorContext
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= SemaRef.ActiveTemplateInstantiations.back();
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}
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}
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Sema::SemaDiagnosticBuilder
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Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
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SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
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PD.Emit(Builder);
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return Builder;
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}
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void Sema::ActOnComment(SourceRange Comment) {
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Context.Comments.push_back(Comment);
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}
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