beecd58e21
tentative definitions off to the ASTConsumer at the end of the translation unit. Eliminate CodeGen's internal tracking of tentative definitions, and instead hook into ASTConsumer::CompleteTentativeDefinition. Also, tweak the definition-deferal logic for C++, where there are no tentative definitions. Fixes <rdar://problem/6808352>, and will make it much easier for precompiled headers to cope with tentative definitions in the future. llvm-svn: 69681
319 lines
12 KiB
C++
319 lines
12 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 "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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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();
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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(true);
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DesugaredTy.setCVRQualifiers(DesugaredTy.getCVRQualifiers() |
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Ty.getCVRQualifiers());
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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 desugar magic Objective-C types.
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Ty.getUnqualifiedType() != Context.getObjCIdType() &&
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Ty.getUnqualifiedType() != Context.getObjCSelType() &&
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Ty.getUnqualifiedType() != Context.getObjCProtoType() &&
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Ty.getUnqualifiedType() != Context.getObjCClassType() &&
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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();
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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 {
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assert(Kind == Diagnostic::ak_nameddecl);
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if (ModLen == 1 && Modifier[0] == 'q' && ArgLen == 0)
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S = reinterpret_cast<NamedDecl*>(Val)->getQualifiedNameAsString();
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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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S = reinterpret_cast<NamedDecl*>(Val)->getNameAsString();
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}
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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.getLangOptions().ObjC1) return;
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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(SelTypedef);
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// FIXME: Make sure these don't leak!
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RecordDecl *ClassTag = CreateStructDecl(Context, "objc_class");
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QualType ClassT = Context.getPointerType(Context.getTagDeclType(ClassTag));
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TypedefDecl *ClassTypedef =
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TypedefDecl::Create(Context, CurContext, SourceLocation(),
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&Context.Idents.get("Class"), ClassT);
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PushOnScopeChains(ClassTag, TUScope);
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PushOnScopeChains(ClassTypedef, TUScope);
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Context.setObjCClassType(ClassTypedef);
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// Synthesize "@class Protocol;
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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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// Synthesize "typedef struct objc_object { Class isa; } *id;"
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RecordDecl *ObjectTag = CreateStructDecl(Context, "objc_object");
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QualType ObjT = Context.getPointerType(Context.getTagDeclType(ObjectTag));
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PushOnScopeChains(ObjectTag, TUScope);
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TypedefDecl *IdTypedef = TypedefDecl::Create(Context, CurContext,
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SourceLocation(),
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&Context.Idents.get("id"),
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ObjT);
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PushOnScopeChains(IdTypedef, TUScope);
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Context.setObjCIdType(IdTypedef);
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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()),
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SourceMgr(PP.getSourceManager()), CurContext(0), PreDeclaratorDC(0),
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CurBlock(0), PackContext(0), IdResolver(pp.getLangOptions()),
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GlobalNewDeleteDeclared(false),
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CompleteTranslationUnit(CompleteTranslationUnit) {
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// Get IdentifierInfo objects for known functions for which we
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// do extra checking.
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IdentifierTable &IT = PP.getIdentifierTable();
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KnownFunctionIDs[id_NSLog] = &IT.get("NSLog");
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KnownFunctionIDs[id_NSLogv] = &IT.get("NSLogv");
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KnownFunctionIDs[id_asprintf] = &IT.get("asprintf");
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KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf");
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StdNamespace = 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, 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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ImpCast->setType(Ty);
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ImpCast->setLvalueCast(isLvalue);
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} else
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Expr = new (Context) ImplicitCastExpr(Ty, 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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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 (llvm::DenseMap<DeclarationName, VarDecl *>::iterator
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D = TentativeDefinitions.begin(),
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DEnd = TentativeDefinitions.end();
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D != DEnd; ++D) {
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VarDecl *VD = D->second;
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if (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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else {
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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()),
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true);
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QualType T
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= Context.getConstantArrayType(ArrayT->getElementType(),
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One, ArrayType::Normal, 0);
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VD->setType(T);
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}
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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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/// 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 = CurContext;
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while (isa<BlockDecl>(DC))
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DC = DC->getParent();
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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 = CurContext;
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while (isa<BlockDecl>(DC))
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DC = DC->getParent();
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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 = CurContext;
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while (isa<BlockDecl>(DC))
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DC = DC->getParent();
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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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Sema::SemaDiagnosticBuilder::~SemaDiagnosticBuilder() {
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this->Emit();
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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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