зеркало из https://github.com/microsoft/clang-1.git
1993 строки
80 KiB
C++
1993 строки
80 KiB
C++
//===--- SemaExprCXX.cpp - Semantic Analysis for Expressions --------------===//
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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 semantic analysis for C++ expressions.
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//
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//===----------------------------------------------------------------------===//
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#include "SemaInherit.h"
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#include "Sema.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/Basic/PartialDiagnostic.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Parse/DeclSpec.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace clang;
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/// ActOnCXXConversionFunctionExpr - Parse a C++ conversion function
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/// name (e.g., operator void const *) as an expression. This is
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/// very similar to ActOnIdentifierExpr, except that instead of
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/// providing an identifier the parser provides the type of the
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/// conversion function.
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Sema::OwningExprResult
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Sema::ActOnCXXConversionFunctionExpr(Scope *S, SourceLocation OperatorLoc,
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TypeTy *Ty, bool HasTrailingLParen,
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const CXXScopeSpec &SS,
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bool isAddressOfOperand) {
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//FIXME: Preserve type source info.
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QualType ConvType = GetTypeFromParser(Ty);
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CanQualType ConvTypeCanon = Context.getCanonicalType(ConvType);
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DeclarationName ConvName
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= Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
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return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen,
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&SS, isAddressOfOperand);
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}
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/// ActOnCXXOperatorFunctionIdExpr - Parse a C++ overloaded operator
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/// name (e.g., @c operator+ ) as an expression. This is very
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/// similar to ActOnIdentifierExpr, except that instead of providing
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/// an identifier the parser provides the kind of overloaded
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/// operator that was parsed.
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Sema::OwningExprResult
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Sema::ActOnCXXOperatorFunctionIdExpr(Scope *S, SourceLocation OperatorLoc,
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OverloadedOperatorKind Op,
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bool HasTrailingLParen,
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const CXXScopeSpec &SS,
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bool isAddressOfOperand) {
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DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(Op);
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return ActOnDeclarationNameExpr(S, OperatorLoc, Name, HasTrailingLParen, &SS,
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isAddressOfOperand);
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}
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/// ActOnCXXTypeidOfType - Parse typeid( type-id ).
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Action::OwningExprResult
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Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
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bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
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NamespaceDecl *StdNs = GetStdNamespace();
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if (!StdNs)
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return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
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if (isType)
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// FIXME: Preserve type source info.
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TyOrExpr = GetTypeFromParser(TyOrExpr).getAsOpaquePtr();
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IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
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Decl *TypeInfoDecl = LookupQualifiedName(StdNs, TypeInfoII, LookupTagName);
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RecordDecl *TypeInfoRecordDecl = dyn_cast_or_null<RecordDecl>(TypeInfoDecl);
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if (!TypeInfoRecordDecl)
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return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
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QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);
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if (!isType) {
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// C++0x [expr.typeid]p3:
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// When typeid is applied to an expression other than an lvalue of a
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// polymorphic class type [...] [the] expression is an unevaluated
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// operand.
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// FIXME: if the type of the expression is a class type, the class
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// shall be completely defined.
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bool isUnevaluatedOperand = true;
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Expr *E = static_cast<Expr *>(TyOrExpr);
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if (E && !E->isTypeDependent() && E->isLvalue(Context) == Expr::LV_Valid) {
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QualType T = E->getType();
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if (const RecordType *RecordT = T->getAs<RecordType>()) {
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CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
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if (RecordD->isPolymorphic())
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isUnevaluatedOperand = false;
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}
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}
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// If this is an unevaluated operand, clear out the set of declaration
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// references we have been computing.
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if (isUnevaluatedOperand)
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PotentiallyReferencedDeclStack.back().clear();
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}
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return Owned(new (Context) CXXTypeidExpr(isType, TyOrExpr,
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TypeInfoType.withConst(),
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SourceRange(OpLoc, RParenLoc)));
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}
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/// ActOnCXXBoolLiteral - Parse {true,false} literals.
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Action::OwningExprResult
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Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
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assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
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"Unknown C++ Boolean value!");
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return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
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Context.BoolTy, OpLoc));
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}
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/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
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Action::OwningExprResult
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Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
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return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
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}
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/// ActOnCXXThrow - Parse throw expressions.
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Action::OwningExprResult
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Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
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Expr *Ex = E.takeAs<Expr>();
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if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
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return ExprError();
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return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
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}
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/// CheckCXXThrowOperand - Validate the operand of a throw.
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bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
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// C++ [except.throw]p3:
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// [...] adjusting the type from "array of T" or "function returning T"
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// to "pointer to T" or "pointer to function returning T", [...]
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DefaultFunctionArrayConversion(E);
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// If the type of the exception would be an incomplete type or a pointer
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// to an incomplete type other than (cv) void the program is ill-formed.
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QualType Ty = E->getType();
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int isPointer = 0;
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if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
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Ty = Ptr->getPointeeType();
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isPointer = 1;
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}
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if (!isPointer || !Ty->isVoidType()) {
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if (RequireCompleteType(ThrowLoc, Ty,
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PDiag(isPointer ? diag::err_throw_incomplete_ptr
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: diag::err_throw_incomplete)
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<< E->getSourceRange()))
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return true;
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}
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// FIXME: Construct a temporary here.
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return false;
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}
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Action::OwningExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) {
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/// C++ 9.3.2: In the body of a non-static member function, the keyword this
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/// is a non-lvalue expression whose value is the address of the object for
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/// which the function is called.
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if (!isa<FunctionDecl>(CurContext))
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return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
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if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext))
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if (MD->isInstance())
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return Owned(new (Context) CXXThisExpr(ThisLoc,
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MD->getThisType(Context)));
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return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
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}
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/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
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/// Can be interpreted either as function-style casting ("int(x)")
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/// or class type construction ("ClassType(x,y,z)")
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/// or creation of a value-initialized type ("int()").
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Action::OwningExprResult
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Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
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SourceLocation LParenLoc,
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MultiExprArg exprs,
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SourceLocation *CommaLocs,
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SourceLocation RParenLoc) {
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assert(TypeRep && "Missing type!");
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// FIXME: Preserve type source info.
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QualType Ty = GetTypeFromParser(TypeRep);
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unsigned NumExprs = exprs.size();
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Expr **Exprs = (Expr**)exprs.get();
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SourceLocation TyBeginLoc = TypeRange.getBegin();
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SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
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if (Ty->isDependentType() ||
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CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
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exprs.release();
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return Owned(CXXUnresolvedConstructExpr::Create(Context,
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TypeRange.getBegin(), Ty,
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LParenLoc,
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Exprs, NumExprs,
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RParenLoc));
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}
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if (Ty->isArrayType())
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return ExprError(Diag(TyBeginLoc,
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diag::err_value_init_for_array_type) << FullRange);
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if (!Ty->isVoidType() &&
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RequireCompleteType(TyBeginLoc, Ty,
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PDiag(diag::err_invalid_incomplete_type_use)
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<< FullRange))
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return ExprError();
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if (RequireNonAbstractType(TyBeginLoc, Ty,
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diag::err_allocation_of_abstract_type))
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return ExprError();
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// C++ [expr.type.conv]p1:
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// If the expression list is a single expression, the type conversion
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// expression is equivalent (in definedness, and if defined in meaning) to the
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// corresponding cast expression.
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//
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if (NumExprs == 1) {
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CastExpr::CastKind Kind = CastExpr::CK_Unknown;
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CXXMethodDecl *Method = 0;
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if (CheckCastTypes(TypeRange, Ty, Exprs[0], Kind, Method,
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/*FunctionalStyle=*/true))
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return ExprError();
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exprs.release();
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if (Method) {
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OwningExprResult CastArg
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= BuildCXXCastArgument(TypeRange.getBegin(), Ty.getNonReferenceType(),
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Kind, Method, Owned(Exprs[0]));
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if (CastArg.isInvalid())
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return ExprError();
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Exprs[0] = CastArg.takeAs<Expr>();
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}
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return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
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Ty, TyBeginLoc, Kind,
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Exprs[0], RParenLoc));
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}
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if (const RecordType *RT = Ty->getAs<RecordType>()) {
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CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
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if (NumExprs > 1 || !Record->hasTrivialConstructor() ||
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!Record->hasTrivialDestructor()) {
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ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
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CXXConstructorDecl *Constructor
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= PerformInitializationByConstructor(Ty, move(exprs),
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TypeRange.getBegin(),
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SourceRange(TypeRange.getBegin(),
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RParenLoc),
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DeclarationName(),
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IK_Direct,
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ConstructorArgs);
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if (!Constructor)
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return ExprError();
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OwningExprResult Result =
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BuildCXXTemporaryObjectExpr(Constructor, Ty, TyBeginLoc,
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move_arg(ConstructorArgs), RParenLoc);
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if (Result.isInvalid())
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return ExprError();
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return MaybeBindToTemporary(Result.takeAs<Expr>());
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}
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// Fall through to value-initialize an object of class type that
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// doesn't have a user-declared default constructor.
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}
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// C++ [expr.type.conv]p1:
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// If the expression list specifies more than a single value, the type shall
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// be a class with a suitably declared constructor.
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//
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if (NumExprs > 1)
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return ExprError(Diag(CommaLocs[0],
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diag::err_builtin_func_cast_more_than_one_arg)
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<< FullRange);
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assert(NumExprs == 0 && "Expected 0 expressions");
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// C++ [expr.type.conv]p2:
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// The expression T(), where T is a simple-type-specifier for a non-array
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// complete object type or the (possibly cv-qualified) void type, creates an
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// rvalue of the specified type, which is value-initialized.
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//
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exprs.release();
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return Owned(new (Context) CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc));
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}
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/// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
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/// @code new (memory) int[size][4] @endcode
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/// or
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/// @code ::new Foo(23, "hello") @endcode
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/// For the interpretation of this heap of arguments, consult the base version.
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Action::OwningExprResult
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Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
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SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
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SourceLocation PlacementRParen, bool ParenTypeId,
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Declarator &D, SourceLocation ConstructorLParen,
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MultiExprArg ConstructorArgs,
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SourceLocation ConstructorRParen) {
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Expr *ArraySize = 0;
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unsigned Skip = 0;
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// If the specified type is an array, unwrap it and save the expression.
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if (D.getNumTypeObjects() > 0 &&
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D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
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DeclaratorChunk &Chunk = D.getTypeObject(0);
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if (Chunk.Arr.hasStatic)
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return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
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<< D.getSourceRange());
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if (!Chunk.Arr.NumElts)
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return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
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<< D.getSourceRange());
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ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
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Skip = 1;
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}
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// Every dimension shall be of constant size.
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if (D.getNumTypeObjects() > 0 &&
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D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
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for (unsigned I = 1, N = D.getNumTypeObjects(); I < N; ++I) {
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if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
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break;
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DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
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if (Expr *NumElts = (Expr *)Array.NumElts) {
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if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
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!NumElts->isIntegerConstantExpr(Context)) {
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Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
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<< NumElts->getSourceRange();
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return ExprError();
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}
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}
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}
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}
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//FIXME: Store DeclaratorInfo in CXXNew expression.
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DeclaratorInfo *DInfo = 0;
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QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &DInfo, Skip);
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if (D.isInvalidType())
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return ExprError();
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return BuildCXXNew(StartLoc, UseGlobal,
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PlacementLParen,
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move(PlacementArgs),
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PlacementRParen,
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ParenTypeId,
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AllocType,
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D.getSourceRange().getBegin(),
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D.getSourceRange(),
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Owned(ArraySize),
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ConstructorLParen,
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move(ConstructorArgs),
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ConstructorRParen);
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}
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Sema::OwningExprResult
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Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
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SourceLocation PlacementLParen,
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MultiExprArg PlacementArgs,
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SourceLocation PlacementRParen,
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bool ParenTypeId,
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QualType AllocType,
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SourceLocation TypeLoc,
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SourceRange TypeRange,
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ExprArg ArraySizeE,
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SourceLocation ConstructorLParen,
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MultiExprArg ConstructorArgs,
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SourceLocation ConstructorRParen) {
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if (CheckAllocatedType(AllocType, TypeLoc, TypeRange))
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return ExprError();
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QualType ResultType = Context.getPointerType(AllocType);
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// That every array dimension except the first is constant was already
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// checked by the type check above.
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// C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
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// or enumeration type with a non-negative value."
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Expr *ArraySize = (Expr *)ArraySizeE.get();
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if (ArraySize && !ArraySize->isTypeDependent()) {
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QualType SizeType = ArraySize->getType();
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if (!SizeType->isIntegralType() && !SizeType->isEnumeralType())
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return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
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diag::err_array_size_not_integral)
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<< SizeType << ArraySize->getSourceRange());
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// Let's see if this is a constant < 0. If so, we reject it out of hand.
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// We don't care about special rules, so we tell the machinery it's not
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// evaluated - it gives us a result in more cases.
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if (!ArraySize->isValueDependent()) {
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llvm::APSInt Value;
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if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
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if (Value < llvm::APSInt(
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llvm::APInt::getNullValue(Value.getBitWidth()), false))
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return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
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diag::err_typecheck_negative_array_size)
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<< ArraySize->getSourceRange());
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}
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}
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}
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FunctionDecl *OperatorNew = 0;
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FunctionDecl *OperatorDelete = 0;
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Expr **PlaceArgs = (Expr**)PlacementArgs.get();
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unsigned NumPlaceArgs = PlacementArgs.size();
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if (!AllocType->isDependentType() &&
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!Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
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FindAllocationFunctions(StartLoc,
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SourceRange(PlacementLParen, PlacementRParen),
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UseGlobal, AllocType, ArraySize, PlaceArgs,
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NumPlaceArgs, OperatorNew, OperatorDelete))
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return ExprError();
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bool Init = ConstructorLParen.isValid();
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// --- Choosing a constructor ---
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// C++ 5.3.4p15
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// 1) If T is a POD and there's no initializer (ConstructorLParen is invalid)
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// the object is not initialized. If the object, or any part of it, is
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// const-qualified, it's an error.
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// 2) If T is a POD and there's an empty initializer, the object is value-
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// initialized.
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// 3) If T is a POD and there's one initializer argument, the object is copy-
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// constructed.
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// 4) If T is a POD and there's more initializer arguments, it's an error.
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// 5) If T is not a POD, the initializer arguments are used as constructor
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// arguments.
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//
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// Or by the C++0x formulation:
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// 1) If there's no initializer, the object is default-initialized according
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// to C++0x rules.
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// 2) Otherwise, the object is direct-initialized.
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CXXConstructorDecl *Constructor = 0;
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Expr **ConsArgs = (Expr**)ConstructorArgs.get();
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const RecordType *RT;
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unsigned NumConsArgs = ConstructorArgs.size();
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if (AllocType->isDependentType()) {
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// Skip all the checks.
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} else if ((RT = AllocType->getAs<RecordType>()) &&
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!AllocType->isAggregateType()) {
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ASTOwningVector<&ActionBase::DeleteExpr> ConvertedConstructorArgs(*this);
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Constructor = PerformInitializationByConstructor(
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AllocType, move(ConstructorArgs),
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TypeLoc,
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SourceRange(TypeLoc, ConstructorRParen),
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RT->getDecl()->getDeclName(),
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NumConsArgs != 0 ? IK_Direct : IK_Default,
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ConvertedConstructorArgs);
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if (!Constructor)
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return ExprError();
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// Take the converted constructor arguments and use them for the new
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// expression.
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NumConsArgs = ConvertedConstructorArgs.size();
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ConsArgs = (Expr **)ConvertedConstructorArgs.take();
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} else {
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if (!Init) {
|
|
// FIXME: Check that no subpart is const.
|
|
if (AllocType.isConstQualified())
|
|
return ExprError(Diag(StartLoc, diag::err_new_uninitialized_const)
|
|
<< TypeRange);
|
|
} else if (NumConsArgs == 0) {
|
|
// Object is value-initialized. Do nothing.
|
|
} else if (NumConsArgs == 1) {
|
|
// Object is direct-initialized.
|
|
// FIXME: What DeclarationName do we pass in here?
|
|
if (CheckInitializerTypes(ConsArgs[0], AllocType, StartLoc,
|
|
DeclarationName() /*AllocType.getAsString()*/,
|
|
/*DirectInit=*/true))
|
|
return ExprError();
|
|
} else {
|
|
return ExprError(Diag(StartLoc,
|
|
diag::err_builtin_direct_init_more_than_one_arg)
|
|
<< SourceRange(ConstructorLParen, ConstructorRParen));
|
|
}
|
|
}
|
|
|
|
// FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
|
|
|
|
PlacementArgs.release();
|
|
ConstructorArgs.release();
|
|
ArraySizeE.release();
|
|
return Owned(new (Context) CXXNewExpr(UseGlobal, OperatorNew, PlaceArgs,
|
|
NumPlaceArgs, ParenTypeId, ArraySize, Constructor, Init,
|
|
ConsArgs, NumConsArgs, OperatorDelete, ResultType,
|
|
StartLoc, Init ? ConstructorRParen : SourceLocation()));
|
|
}
|
|
|
|
/// CheckAllocatedType - Checks that a type is suitable as the allocated type
|
|
/// in a new-expression.
|
|
/// dimension off and stores the size expression in ArraySize.
|
|
bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
|
|
SourceRange R) {
|
|
// C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
|
|
// abstract class type or array thereof.
|
|
if (AllocType->isFunctionType())
|
|
return Diag(Loc, diag::err_bad_new_type)
|
|
<< AllocType << 0 << R;
|
|
else if (AllocType->isReferenceType())
|
|
return Diag(Loc, diag::err_bad_new_type)
|
|
<< AllocType << 1 << R;
|
|
else if (!AllocType->isDependentType() &&
|
|
RequireCompleteType(Loc, AllocType,
|
|
PDiag(diag::err_new_incomplete_type)
|
|
<< R))
|
|
return true;
|
|
else if (RequireNonAbstractType(Loc, AllocType,
|
|
diag::err_allocation_of_abstract_type))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// FindAllocationFunctions - Finds the overloads of operator new and delete
|
|
/// that are appropriate for the allocation.
|
|
bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
|
|
bool UseGlobal, QualType AllocType,
|
|
bool IsArray, Expr **PlaceArgs,
|
|
unsigned NumPlaceArgs,
|
|
FunctionDecl *&OperatorNew,
|
|
FunctionDecl *&OperatorDelete) {
|
|
// --- Choosing an allocation function ---
|
|
// C++ 5.3.4p8 - 14 & 18
|
|
// 1) If UseGlobal is true, only look in the global scope. Else, also look
|
|
// in the scope of the allocated class.
|
|
// 2) If an array size is given, look for operator new[], else look for
|
|
// operator new.
|
|
// 3) The first argument is always size_t. Append the arguments from the
|
|
// placement form.
|
|
// FIXME: Also find the appropriate delete operator.
|
|
|
|
llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
|
|
// We don't care about the actual value of this argument.
|
|
// FIXME: Should the Sema create the expression and embed it in the syntax
|
|
// tree? Or should the consumer just recalculate the value?
|
|
IntegerLiteral Size(llvm::APInt::getNullValue(
|
|
Context.Target.getPointerWidth(0)),
|
|
Context.getSizeType(),
|
|
SourceLocation());
|
|
AllocArgs[0] = &Size;
|
|
std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
|
|
|
|
DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
|
|
IsArray ? OO_Array_New : OO_New);
|
|
if (AllocType->isRecordType() && !UseGlobal) {
|
|
CXXRecordDecl *Record
|
|
= cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
|
|
// FIXME: We fail to find inherited overloads.
|
|
if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
|
|
AllocArgs.size(), Record, /*AllowMissing=*/true,
|
|
OperatorNew))
|
|
return true;
|
|
}
|
|
if (!OperatorNew) {
|
|
// Didn't find a member overload. Look for a global one.
|
|
DeclareGlobalNewDelete();
|
|
DeclContext *TUDecl = Context.getTranslationUnitDecl();
|
|
if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
|
|
AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
|
|
OperatorNew))
|
|
return true;
|
|
}
|
|
|
|
// FindAllocationOverload can change the passed in arguments, so we need to
|
|
// copy them back.
|
|
if (NumPlaceArgs > 0)
|
|
std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
|
|
|
|
return false;
|
|
}
|
|
|
|
/// FindAllocationOverload - Find an fitting overload for the allocation
|
|
/// function in the specified scope.
|
|
bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
|
|
DeclarationName Name, Expr** Args,
|
|
unsigned NumArgs, DeclContext *Ctx,
|
|
bool AllowMissing, FunctionDecl *&Operator) {
|
|
DeclContext::lookup_iterator Alloc, AllocEnd;
|
|
llvm::tie(Alloc, AllocEnd) = Ctx->lookup(Name);
|
|
if (Alloc == AllocEnd) {
|
|
if (AllowMissing)
|
|
return false;
|
|
return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
|
|
<< Name << Range;
|
|
}
|
|
|
|
OverloadCandidateSet Candidates;
|
|
for (; Alloc != AllocEnd; ++Alloc) {
|
|
// Even member operator new/delete are implicitly treated as
|
|
// static, so don't use AddMemberCandidate.
|
|
if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(*Alloc))
|
|
AddOverloadCandidate(Fn, Args, NumArgs, Candidates,
|
|
/*SuppressUserConversions=*/false);
|
|
}
|
|
|
|
// Do the resolution.
|
|
OverloadCandidateSet::iterator Best;
|
|
switch(BestViableFunction(Candidates, StartLoc, Best)) {
|
|
case OR_Success: {
|
|
// Got one!
|
|
FunctionDecl *FnDecl = Best->Function;
|
|
// The first argument is size_t, and the first parameter must be size_t,
|
|
// too. This is checked on declaration and can be assumed. (It can't be
|
|
// asserted on, though, since invalid decls are left in there.)
|
|
for (unsigned i = 1; i < NumArgs; ++i) {
|
|
// FIXME: Passing word to diagnostic.
|
|
if (PerformCopyInitialization(Args[i],
|
|
FnDecl->getParamDecl(i)->getType(),
|
|
"passing"))
|
|
return true;
|
|
}
|
|
Operator = FnDecl;
|
|
return false;
|
|
}
|
|
|
|
case OR_No_Viable_Function:
|
|
Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
|
|
<< Name << Range;
|
|
PrintOverloadCandidates(Candidates, /*OnlyViable=*/false);
|
|
return true;
|
|
|
|
case OR_Ambiguous:
|
|
Diag(StartLoc, diag::err_ovl_ambiguous_call)
|
|
<< Name << Range;
|
|
PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
|
|
return true;
|
|
|
|
case OR_Deleted:
|
|
Diag(StartLoc, diag::err_ovl_deleted_call)
|
|
<< Best->Function->isDeleted()
|
|
<< Name << Range;
|
|
PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
|
|
return true;
|
|
}
|
|
assert(false && "Unreachable, bad result from BestViableFunction");
|
|
return true;
|
|
}
|
|
|
|
|
|
/// DeclareGlobalNewDelete - Declare the global forms of operator new and
|
|
/// delete. These are:
|
|
/// @code
|
|
/// void* operator new(std::size_t) throw(std::bad_alloc);
|
|
/// void* operator new[](std::size_t) throw(std::bad_alloc);
|
|
/// void operator delete(void *) throw();
|
|
/// void operator delete[](void *) throw();
|
|
/// @endcode
|
|
/// Note that the placement and nothrow forms of new are *not* implicitly
|
|
/// declared. Their use requires including \<new\>.
|
|
void Sema::DeclareGlobalNewDelete() {
|
|
if (GlobalNewDeleteDeclared)
|
|
return;
|
|
GlobalNewDeleteDeclared = true;
|
|
|
|
QualType VoidPtr = Context.getPointerType(Context.VoidTy);
|
|
QualType SizeT = Context.getSizeType();
|
|
|
|
// FIXME: Exception specifications are not added.
|
|
DeclareGlobalAllocationFunction(
|
|
Context.DeclarationNames.getCXXOperatorName(OO_New),
|
|
VoidPtr, SizeT);
|
|
DeclareGlobalAllocationFunction(
|
|
Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
|
|
VoidPtr, SizeT);
|
|
DeclareGlobalAllocationFunction(
|
|
Context.DeclarationNames.getCXXOperatorName(OO_Delete),
|
|
Context.VoidTy, VoidPtr);
|
|
DeclareGlobalAllocationFunction(
|
|
Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
|
|
Context.VoidTy, VoidPtr);
|
|
}
|
|
|
|
/// DeclareGlobalAllocationFunction - Declares a single implicit global
|
|
/// allocation function if it doesn't already exist.
|
|
void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
|
|
QualType Return, QualType Argument) {
|
|
DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
|
|
|
|
// Check if this function is already declared.
|
|
{
|
|
DeclContext::lookup_iterator Alloc, AllocEnd;
|
|
for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
|
|
Alloc != AllocEnd; ++Alloc) {
|
|
// FIXME: Do we need to check for default arguments here?
|
|
FunctionDecl *Func = cast<FunctionDecl>(*Alloc);
|
|
if (Func->getNumParams() == 1 &&
|
|
Context.getCanonicalType(Func->getParamDecl(0)->getType())==Argument)
|
|
return;
|
|
}
|
|
}
|
|
|
|
QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0);
|
|
FunctionDecl *Alloc =
|
|
FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
|
|
FnType, /*DInfo=*/0, FunctionDecl::None, false, true);
|
|
Alloc->setImplicit();
|
|
ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
|
|
0, Argument, /*DInfo=*/0,
|
|
VarDecl::None, 0);
|
|
Alloc->setParams(Context, &Param, 1);
|
|
|
|
// FIXME: Also add this declaration to the IdentifierResolver, but
|
|
// make sure it is at the end of the chain to coincide with the
|
|
// global scope.
|
|
((DeclContext *)TUScope->getEntity())->addDecl(Alloc);
|
|
}
|
|
|
|
/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
|
|
/// @code ::delete ptr; @endcode
|
|
/// or
|
|
/// @code delete [] ptr; @endcode
|
|
Action::OwningExprResult
|
|
Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
|
|
bool ArrayForm, ExprArg Operand) {
|
|
// C++ [expr.delete]p1:
|
|
// The operand shall have a pointer type, or a class type having a single
|
|
// conversion function to a pointer type. The result has type void.
|
|
//
|
|
// DR599 amends "pointer type" to "pointer to object type" in both cases.
|
|
|
|
FunctionDecl *OperatorDelete = 0;
|
|
|
|
Expr *Ex = (Expr *)Operand.get();
|
|
if (!Ex->isTypeDependent()) {
|
|
QualType Type = Ex->getType();
|
|
|
|
if (const RecordType *Record = Type->getAs<RecordType>()) {
|
|
llvm::SmallVector<CXXConversionDecl *, 4> ObjectPtrConversions;
|
|
CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
|
|
OverloadedFunctionDecl *Conversions =
|
|
RD->getVisibleConversionFunctions(Context, RD);
|
|
|
|
for (OverloadedFunctionDecl::function_iterator
|
|
Func = Conversions->function_begin(),
|
|
FuncEnd = Conversions->function_end();
|
|
Func != FuncEnd; ++Func) {
|
|
// Skip over templated conversion functions; they aren't considered.
|
|
if (isa<FunctionTemplateDecl>(*Func))
|
|
continue;
|
|
|
|
CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func);
|
|
|
|
QualType ConvType = Conv->getConversionType().getNonReferenceType();
|
|
if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
|
|
if (ConvPtrType->getPointeeType()->isObjectType())
|
|
ObjectPtrConversions.push_back(Conv);
|
|
}
|
|
|
|
if (ObjectPtrConversions.size() == 1) {
|
|
// We have a single conversion to a pointer-to-object type. Perform
|
|
// that conversion.
|
|
Operand.release();
|
|
if (PerformImplicitConversion(Ex,
|
|
ObjectPtrConversions.front()->getConversionType(),
|
|
"converting"))
|
|
return ExprError();
|
|
|
|
Operand = Owned(Ex);
|
|
Type = Ex->getType();
|
|
}
|
|
}
|
|
|
|
if (!Type->isPointerType())
|
|
return ExprError(Diag(StartLoc, diag::err_delete_operand)
|
|
<< Type << Ex->getSourceRange());
|
|
|
|
QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
|
|
if (Pointee->isFunctionType() || Pointee->isVoidType())
|
|
return ExprError(Diag(StartLoc, diag::err_delete_operand)
|
|
<< Type << Ex->getSourceRange());
|
|
else if (!Pointee->isDependentType() &&
|
|
RequireCompleteType(StartLoc, Pointee,
|
|
PDiag(diag::warn_delete_incomplete)
|
|
<< Ex->getSourceRange()))
|
|
return ExprError();
|
|
|
|
// FIXME: This should be shared with the code for finding the delete
|
|
// operator in ActOnCXXNew.
|
|
IntegerLiteral Size(llvm::APInt::getNullValue(
|
|
Context.Target.getPointerWidth(0)),
|
|
Context.getSizeType(),
|
|
SourceLocation());
|
|
ImplicitCastExpr Cast(Context.getPointerType(Context.VoidTy),
|
|
CastExpr::CK_Unknown, &Size, false);
|
|
Expr *DeleteArg = &Cast;
|
|
|
|
DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
|
|
ArrayForm ? OO_Array_Delete : OO_Delete);
|
|
|
|
if (Pointee->isRecordType() && !UseGlobal) {
|
|
CXXRecordDecl *Record
|
|
= cast<CXXRecordDecl>(Pointee->getAs<RecordType>()->getDecl());
|
|
// FIXME: We fail to find inherited overloads.
|
|
if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
|
|
&DeleteArg, 1, Record, /*AllowMissing=*/true,
|
|
OperatorDelete))
|
|
return ExprError();
|
|
if (!Record->hasTrivialDestructor())
|
|
if (const CXXDestructorDecl *Dtor = Record->getDestructor(Context))
|
|
MarkDeclarationReferenced(StartLoc,
|
|
const_cast<CXXDestructorDecl*>(Dtor));
|
|
}
|
|
|
|
if (!OperatorDelete) {
|
|
// Didn't find a member overload. Look for a global one.
|
|
DeclareGlobalNewDelete();
|
|
DeclContext *TUDecl = Context.getTranslationUnitDecl();
|
|
if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
|
|
&DeleteArg, 1, TUDecl, /*AllowMissing=*/false,
|
|
OperatorDelete))
|
|
return ExprError();
|
|
}
|
|
|
|
// FIXME: Check access and ambiguity of operator delete and destructor.
|
|
}
|
|
|
|
Operand.release();
|
|
return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
|
|
OperatorDelete, Ex, StartLoc));
|
|
}
|
|
|
|
|
|
/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
|
|
/// C++ if/switch/while/for statement.
|
|
/// e.g: "if (int x = f()) {...}"
|
|
Action::OwningExprResult
|
|
Sema::ActOnCXXConditionDeclarationExpr(Scope *S, SourceLocation StartLoc,
|
|
Declarator &D,
|
|
SourceLocation EqualLoc,
|
|
ExprArg AssignExprVal) {
|
|
assert(AssignExprVal.get() && "Null assignment expression");
|
|
|
|
// C++ 6.4p2:
|
|
// The declarator shall not specify a function or an array.
|
|
// The type-specifier-seq shall not contain typedef and shall not declare a
|
|
// new class or enumeration.
|
|
|
|
assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
|
|
"Parser allowed 'typedef' as storage class of condition decl.");
|
|
|
|
// FIXME: Store DeclaratorInfo in the expression.
|
|
DeclaratorInfo *DInfo = 0;
|
|
TagDecl *OwnedTag = 0;
|
|
QualType Ty = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag);
|
|
|
|
if (Ty->isFunctionType()) { // The declarator shall not specify a function...
|
|
// We exit without creating a CXXConditionDeclExpr because a FunctionDecl
|
|
// would be created and CXXConditionDeclExpr wants a VarDecl.
|
|
return ExprError(Diag(StartLoc, diag::err_invalid_use_of_function_type)
|
|
<< SourceRange(StartLoc, EqualLoc));
|
|
} else if (Ty->isArrayType()) { // ...or an array.
|
|
Diag(StartLoc, diag::err_invalid_use_of_array_type)
|
|
<< SourceRange(StartLoc, EqualLoc);
|
|
} else if (OwnedTag && OwnedTag->isDefinition()) {
|
|
// The type-specifier-seq shall not declare a new class or enumeration.
|
|
Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition);
|
|
}
|
|
|
|
DeclPtrTy Dcl = ActOnDeclarator(S, D);
|
|
if (!Dcl)
|
|
return ExprError();
|
|
AddInitializerToDecl(Dcl, move(AssignExprVal), /*DirectInit=*/false);
|
|
|
|
// Mark this variable as one that is declared within a conditional.
|
|
// We know that the decl had to be a VarDecl because that is the only type of
|
|
// decl that can be assigned and the grammar requires an '='.
|
|
VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>());
|
|
VD->setDeclaredInCondition(true);
|
|
return Owned(new (Context) CXXConditionDeclExpr(StartLoc, EqualLoc, VD));
|
|
}
|
|
|
|
/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
|
|
bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) {
|
|
// C++ 6.4p4:
|
|
// The value of a condition that is an initialized declaration in a statement
|
|
// other than a switch statement is the value of the declared variable
|
|
// implicitly converted to type bool. If that conversion is ill-formed, the
|
|
// program is ill-formed.
|
|
// The value of a condition that is an expression is the value of the
|
|
// expression, implicitly converted to bool.
|
|
//
|
|
return PerformContextuallyConvertToBool(CondExpr);
|
|
}
|
|
|
|
/// Helper function to determine whether this is the (deprecated) C++
|
|
/// conversion from a string literal to a pointer to non-const char or
|
|
/// non-const wchar_t (for narrow and wide string literals,
|
|
/// respectively).
|
|
bool
|
|
Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
|
|
// Look inside the implicit cast, if it exists.
|
|
if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
|
|
From = Cast->getSubExpr();
|
|
|
|
// A string literal (2.13.4) that is not a wide string literal can
|
|
// be converted to an rvalue of type "pointer to char"; a wide
|
|
// string literal can be converted to an rvalue of type "pointer
|
|
// to wchar_t" (C++ 4.2p2).
|
|
if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From))
|
|
if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
|
|
if (const BuiltinType *ToPointeeType
|
|
= ToPtrType->getPointeeType()->getAsBuiltinType()) {
|
|
// This conversion is considered only when there is an
|
|
// explicit appropriate pointer target type (C++ 4.2p2).
|
|
if (ToPtrType->getPointeeType().getCVRQualifiers() == 0 &&
|
|
((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
|
|
(!StrLit->isWide() &&
|
|
(ToPointeeType->getKind() == BuiltinType::Char_U ||
|
|
ToPointeeType->getKind() == BuiltinType::Char_S))))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// PerformImplicitConversion - Perform an implicit conversion of the
|
|
/// expression From to the type ToType. Returns true if there was an
|
|
/// error, false otherwise. The expression From is replaced with the
|
|
/// converted expression. Flavor is the kind of conversion we're
|
|
/// performing, used in the error message. If @p AllowExplicit,
|
|
/// explicit user-defined conversions are permitted. @p Elidable should be true
|
|
/// when called for copies which may be elided (C++ 12.8p15). C++0x overload
|
|
/// resolution works differently in that case.
|
|
bool
|
|
Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
|
|
const char *Flavor, bool AllowExplicit,
|
|
bool Elidable) {
|
|
ImplicitConversionSequence ICS;
|
|
ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
|
|
if (Elidable && getLangOptions().CPlusPlus0x) {
|
|
ICS = TryImplicitConversion(From, ToType,
|
|
/*SuppressUserConversions=*/false,
|
|
AllowExplicit,
|
|
/*ForceRValue=*/true,
|
|
/*InOverloadResolution=*/false);
|
|
}
|
|
if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
|
|
ICS = TryImplicitConversion(From, ToType,
|
|
/*SuppressUserConversions=*/false,
|
|
AllowExplicit,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
}
|
|
return PerformImplicitConversion(From, ToType, ICS, Flavor);
|
|
}
|
|
|
|
/// PerformImplicitConversion - Perform an implicit conversion of the
|
|
/// expression From to the type ToType using the pre-computed implicit
|
|
/// conversion sequence ICS. Returns true if there was an error, false
|
|
/// otherwise. The expression From is replaced with the converted
|
|
/// expression. Flavor is the kind of conversion we're performing,
|
|
/// used in the error message.
|
|
bool
|
|
Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
|
|
const ImplicitConversionSequence &ICS,
|
|
const char* Flavor) {
|
|
switch (ICS.ConversionKind) {
|
|
case ImplicitConversionSequence::StandardConversion:
|
|
if (PerformImplicitConversion(From, ToType, ICS.Standard, Flavor))
|
|
return true;
|
|
break;
|
|
|
|
case ImplicitConversionSequence::UserDefinedConversion:
|
|
{
|
|
FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
|
|
CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
|
|
if (isa<CXXConversionDecl>(FD))
|
|
CastKind = CastExpr::CK_UserDefinedConversion;
|
|
else if (isa<CXXConstructorDecl>(FD))
|
|
CastKind = CastExpr::CK_ConstructorConversion;
|
|
else
|
|
assert(0 && "Unknown conversion function kind!");
|
|
|
|
OwningExprResult CastArg
|
|
= BuildCXXCastArgument(From->getLocStart(),
|
|
ToType.getNonReferenceType(),
|
|
CastKind, cast<CXXMethodDecl>(FD),
|
|
Owned(From));
|
|
|
|
if (CastArg.isInvalid())
|
|
return true;
|
|
|
|
From = new (Context) ImplicitCastExpr(ToType.getNonReferenceType(),
|
|
CastKind, CastArg.takeAs<Expr>(),
|
|
ToType->isLValueReferenceType());
|
|
return false;
|
|
}
|
|
|
|
case ImplicitConversionSequence::EllipsisConversion:
|
|
assert(false && "Cannot perform an ellipsis conversion");
|
|
return false;
|
|
|
|
case ImplicitConversionSequence::BadConversion:
|
|
return true;
|
|
}
|
|
|
|
// Everything went well.
|
|
return false;
|
|
}
|
|
|
|
/// PerformImplicitConversion - Perform an implicit conversion of the
|
|
/// expression From to the type ToType by following the standard
|
|
/// conversion sequence SCS. Returns true if there was an error, false
|
|
/// otherwise. The expression From is replaced with the converted
|
|
/// expression. Flavor is the context in which we're performing this
|
|
/// conversion, for use in error messages.
|
|
bool
|
|
Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
|
|
const StandardConversionSequence& SCS,
|
|
const char *Flavor) {
|
|
// Overall FIXME: we are recomputing too many types here and doing far too
|
|
// much extra work. What this means is that we need to keep track of more
|
|
// information that is computed when we try the implicit conversion initially,
|
|
// so that we don't need to recompute anything here.
|
|
QualType FromType = From->getType();
|
|
|
|
if (SCS.CopyConstructor) {
|
|
// FIXME: When can ToType be a reference type?
|
|
assert(!ToType->isReferenceType());
|
|
|
|
OwningExprResult FromResult =
|
|
BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
|
|
ToType, SCS.CopyConstructor,
|
|
MultiExprArg(*this, (void**)&From, 1));
|
|
|
|
if (FromResult.isInvalid())
|
|
return true;
|
|
|
|
From = FromResult.takeAs<Expr>();
|
|
return false;
|
|
}
|
|
|
|
// Perform the first implicit conversion.
|
|
switch (SCS.First) {
|
|
case ICK_Identity:
|
|
case ICK_Lvalue_To_Rvalue:
|
|
// Nothing to do.
|
|
break;
|
|
|
|
case ICK_Array_To_Pointer:
|
|
FromType = Context.getArrayDecayedType(FromType);
|
|
ImpCastExprToType(From, FromType, CastExpr::CK_ArrayToPointerDecay);
|
|
break;
|
|
|
|
case ICK_Function_To_Pointer:
|
|
if (Context.getCanonicalType(FromType) == Context.OverloadTy) {
|
|
FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, true);
|
|
if (!Fn)
|
|
return true;
|
|
|
|
if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
|
|
return true;
|
|
|
|
FixOverloadedFunctionReference(From, Fn);
|
|
FromType = From->getType();
|
|
}
|
|
FromType = Context.getPointerType(FromType);
|
|
ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
|
|
break;
|
|
|
|
default:
|
|
assert(false && "Improper first standard conversion");
|
|
break;
|
|
}
|
|
|
|
// Perform the second implicit conversion
|
|
switch (SCS.Second) {
|
|
case ICK_Identity:
|
|
// Nothing to do.
|
|
break;
|
|
|
|
case ICK_Integral_Promotion:
|
|
case ICK_Floating_Promotion:
|
|
case ICK_Complex_Promotion:
|
|
case ICK_Integral_Conversion:
|
|
case ICK_Floating_Conversion:
|
|
case ICK_Complex_Conversion:
|
|
case ICK_Floating_Integral:
|
|
case ICK_Complex_Real:
|
|
case ICK_Compatible_Conversion:
|
|
// FIXME: Go deeper to get the unqualified type!
|
|
FromType = ToType.getUnqualifiedType();
|
|
ImpCastExprToType(From, FromType);
|
|
break;
|
|
|
|
case ICK_Pointer_Conversion:
|
|
if (SCS.IncompatibleObjC) {
|
|
// Diagnose incompatible Objective-C conversions
|
|
Diag(From->getSourceRange().getBegin(),
|
|
diag::ext_typecheck_convert_incompatible_pointer)
|
|
<< From->getType() << ToType << Flavor
|
|
<< From->getSourceRange();
|
|
}
|
|
|
|
if (CheckPointerConversion(From, ToType))
|
|
return true;
|
|
ImpCastExprToType(From, ToType);
|
|
break;
|
|
|
|
case ICK_Pointer_Member: {
|
|
CastExpr::CastKind Kind = CastExpr::CK_Unknown;
|
|
if (CheckMemberPointerConversion(From, ToType, Kind))
|
|
return true;
|
|
ImpCastExprToType(From, ToType, Kind);
|
|
break;
|
|
}
|
|
case ICK_Boolean_Conversion:
|
|
FromType = Context.BoolTy;
|
|
ImpCastExprToType(From, FromType);
|
|
break;
|
|
|
|
default:
|
|
assert(false && "Improper second standard conversion");
|
|
break;
|
|
}
|
|
|
|
switch (SCS.Third) {
|
|
case ICK_Identity:
|
|
// Nothing to do.
|
|
break;
|
|
|
|
case ICK_Qualification:
|
|
// FIXME: Not sure about lvalue vs rvalue here in the presence of rvalue
|
|
// references.
|
|
ImpCastExprToType(From, ToType.getNonReferenceType(),
|
|
CastExpr::CK_Unknown,
|
|
ToType->isLValueReferenceType());
|
|
break;
|
|
|
|
default:
|
|
assert(false && "Improper second standard conversion");
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
|
|
SourceLocation KWLoc,
|
|
SourceLocation LParen,
|
|
TypeTy *Ty,
|
|
SourceLocation RParen) {
|
|
QualType T = GetTypeFromParser(Ty);
|
|
|
|
// According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
|
|
// all traits except __is_class, __is_enum and __is_union require a the type
|
|
// to be complete.
|
|
if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
|
|
if (RequireCompleteType(KWLoc, T,
|
|
diag::err_incomplete_type_used_in_type_trait_expr))
|
|
return ExprError();
|
|
}
|
|
|
|
// There is no point in eagerly computing the value. The traits are designed
|
|
// to be used from type trait templates, so Ty will be a template parameter
|
|
// 99% of the time.
|
|
return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
|
|
RParen, Context.BoolTy));
|
|
}
|
|
|
|
QualType Sema::CheckPointerToMemberOperands(
|
|
Expr *&lex, Expr *&rex, SourceLocation Loc, bool isIndirect) {
|
|
const char *OpSpelling = isIndirect ? "->*" : ".*";
|
|
// C++ 5.5p2
|
|
// The binary operator .* [p3: ->*] binds its second operand, which shall
|
|
// be of type "pointer to member of T" (where T is a completely-defined
|
|
// class type) [...]
|
|
QualType RType = rex->getType();
|
|
const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
|
|
if (!MemPtr) {
|
|
Diag(Loc, diag::err_bad_memptr_rhs)
|
|
<< OpSpelling << RType << rex->getSourceRange();
|
|
return QualType();
|
|
}
|
|
|
|
QualType Class(MemPtr->getClass(), 0);
|
|
|
|
// C++ 5.5p2
|
|
// [...] to its first operand, which shall be of class T or of a class of
|
|
// which T is an unambiguous and accessible base class. [p3: a pointer to
|
|
// such a class]
|
|
QualType LType = lex->getType();
|
|
if (isIndirect) {
|
|
if (const PointerType *Ptr = LType->getAs<PointerType>())
|
|
LType = Ptr->getPointeeType().getNonReferenceType();
|
|
else {
|
|
Diag(Loc, diag::err_bad_memptr_lhs)
|
|
<< OpSpelling << 1 << LType << lex->getSourceRange();
|
|
return QualType();
|
|
}
|
|
}
|
|
|
|
if (Context.getCanonicalType(Class).getUnqualifiedType() !=
|
|
Context.getCanonicalType(LType).getUnqualifiedType()) {
|
|
BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false,
|
|
/*DetectVirtual=*/false);
|
|
// FIXME: Would it be useful to print full ambiguity paths, or is that
|
|
// overkill?
|
|
if (!IsDerivedFrom(LType, Class, Paths) ||
|
|
Paths.isAmbiguous(Context.getCanonicalType(Class))) {
|
|
Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
|
|
<< (int)isIndirect << lex->getType() << lex->getSourceRange();
|
|
return QualType();
|
|
}
|
|
}
|
|
|
|
// C++ 5.5p2
|
|
// The result is an object or a function of the type specified by the
|
|
// second operand.
|
|
// The cv qualifiers are the union of those in the pointer and the left side,
|
|
// in accordance with 5.5p5 and 5.2.5.
|
|
// FIXME: This returns a dereferenced member function pointer as a normal
|
|
// function type. However, the only operation valid on such functions is
|
|
// calling them. There's also a GCC extension to get a function pointer to the
|
|
// thing, which is another complication, because this type - unlike the type
|
|
// that is the result of this expression - takes the class as the first
|
|
// argument.
|
|
// We probably need a "MemberFunctionClosureType" or something like that.
|
|
QualType Result = MemPtr->getPointeeType();
|
|
if (LType.isConstQualified())
|
|
Result.addConst();
|
|
if (LType.isVolatileQualified())
|
|
Result.addVolatile();
|
|
return Result;
|
|
}
|
|
|
|
/// \brief Get the target type of a standard or user-defined conversion.
|
|
static QualType TargetType(const ImplicitConversionSequence &ICS) {
|
|
assert((ICS.ConversionKind ==
|
|
ImplicitConversionSequence::StandardConversion ||
|
|
ICS.ConversionKind ==
|
|
ImplicitConversionSequence::UserDefinedConversion) &&
|
|
"function only valid for standard or user-defined conversions");
|
|
if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion)
|
|
return QualType::getFromOpaquePtr(ICS.Standard.ToTypePtr);
|
|
return QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
|
|
}
|
|
|
|
/// \brief Try to convert a type to another according to C++0x 5.16p3.
|
|
///
|
|
/// This is part of the parameter validation for the ? operator. If either
|
|
/// value operand is a class type, the two operands are attempted to be
|
|
/// converted to each other. This function does the conversion in one direction.
|
|
/// It emits a diagnostic and returns true only if it finds an ambiguous
|
|
/// conversion.
|
|
static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
|
|
SourceLocation QuestionLoc,
|
|
ImplicitConversionSequence &ICS) {
|
|
// C++0x 5.16p3
|
|
// The process for determining whether an operand expression E1 of type T1
|
|
// can be converted to match an operand expression E2 of type T2 is defined
|
|
// as follows:
|
|
// -- If E2 is an lvalue:
|
|
if (To->isLvalue(Self.Context) == Expr::LV_Valid) {
|
|
// E1 can be converted to match E2 if E1 can be implicitly converted to
|
|
// type "lvalue reference to T2", subject to the constraint that in the
|
|
// conversion the reference must bind directly to E1.
|
|
if (!Self.CheckReferenceInit(From,
|
|
Self.Context.getLValueReferenceType(To->getType()),
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
&ICS))
|
|
{
|
|
assert((ICS.ConversionKind ==
|
|
ImplicitConversionSequence::StandardConversion ||
|
|
ICS.ConversionKind ==
|
|
ImplicitConversionSequence::UserDefinedConversion) &&
|
|
"expected a definite conversion");
|
|
bool DirectBinding =
|
|
ICS.ConversionKind == ImplicitConversionSequence::StandardConversion ?
|
|
ICS.Standard.DirectBinding : ICS.UserDefined.After.DirectBinding;
|
|
if (DirectBinding)
|
|
return false;
|
|
}
|
|
}
|
|
ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
|
|
// -- If E2 is an rvalue, or if the conversion above cannot be done:
|
|
// -- if E1 and E2 have class type, and the underlying class types are
|
|
// the same or one is a base class of the other:
|
|
QualType FTy = From->getType();
|
|
QualType TTy = To->getType();
|
|
const RecordType *FRec = FTy->getAs<RecordType>();
|
|
const RecordType *TRec = TTy->getAs<RecordType>();
|
|
bool FDerivedFromT = FRec && TRec && Self.IsDerivedFrom(FTy, TTy);
|
|
if (FRec && TRec && (FRec == TRec ||
|
|
FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
|
|
// E1 can be converted to match E2 if the class of T2 is the
|
|
// same type as, or a base class of, the class of T1, and
|
|
// [cv2 > cv1].
|
|
if ((FRec == TRec || FDerivedFromT) && TTy.isAtLeastAsQualifiedAs(FTy)) {
|
|
// Could still fail if there's no copy constructor.
|
|
// FIXME: Is this a hard error then, or just a conversion failure? The
|
|
// standard doesn't say.
|
|
ICS = Self.TryCopyInitialization(From, TTy,
|
|
/*SuppressUserConversions=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
}
|
|
} else {
|
|
// -- Otherwise: E1 can be converted to match E2 if E1 can be
|
|
// implicitly converted to the type that expression E2 would have
|
|
// if E2 were converted to an rvalue.
|
|
// First find the decayed type.
|
|
if (TTy->isFunctionType())
|
|
TTy = Self.Context.getPointerType(TTy);
|
|
else if (TTy->isArrayType())
|
|
TTy = Self.Context.getArrayDecayedType(TTy);
|
|
|
|
// Now try the implicit conversion.
|
|
// FIXME: This doesn't detect ambiguities.
|
|
ICS = Self.TryImplicitConversion(From, TTy,
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// \brief Try to find a common type for two according to C++0x 5.16p5.
|
|
///
|
|
/// This is part of the parameter validation for the ? operator. If either
|
|
/// value operand is a class type, overload resolution is used to find a
|
|
/// conversion to a common type.
|
|
static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
|
|
SourceLocation Loc) {
|
|
Expr *Args[2] = { LHS, RHS };
|
|
OverloadCandidateSet CandidateSet;
|
|
Self.AddBuiltinOperatorCandidates(OO_Conditional, Args, 2, CandidateSet);
|
|
|
|
OverloadCandidateSet::iterator Best;
|
|
switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
|
|
case Sema::OR_Success:
|
|
// We found a match. Perform the conversions on the arguments and move on.
|
|
if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
|
|
Best->Conversions[0], "converting") ||
|
|
Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
|
|
Best->Conversions[1], "converting"))
|
|
break;
|
|
return false;
|
|
|
|
case Sema::OR_No_Viable_Function:
|
|
Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
|
|
<< LHS->getType() << RHS->getType()
|
|
<< LHS->getSourceRange() << RHS->getSourceRange();
|
|
return true;
|
|
|
|
case Sema::OR_Ambiguous:
|
|
Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
|
|
<< LHS->getType() << RHS->getType()
|
|
<< LHS->getSourceRange() << RHS->getSourceRange();
|
|
// FIXME: Print the possible common types by printing the return types of
|
|
// the viable candidates.
|
|
break;
|
|
|
|
case Sema::OR_Deleted:
|
|
assert(false && "Conditional operator has only built-in overloads");
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// \brief Perform an "extended" implicit conversion as returned by
|
|
/// TryClassUnification.
|
|
///
|
|
/// TryClassUnification generates ICSs that include reference bindings.
|
|
/// PerformImplicitConversion is not suitable for this; it chokes if the
|
|
/// second part of a standard conversion is ICK_DerivedToBase. This function
|
|
/// handles the reference binding specially.
|
|
static bool ConvertForConditional(Sema &Self, Expr *&E,
|
|
const ImplicitConversionSequence &ICS) {
|
|
if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion &&
|
|
ICS.Standard.ReferenceBinding) {
|
|
assert(ICS.Standard.DirectBinding &&
|
|
"TryClassUnification should never generate indirect ref bindings");
|
|
// FIXME: CheckReferenceInit should be able to reuse the ICS instead of
|
|
// redoing all the work.
|
|
return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
|
|
TargetType(ICS)),
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false);
|
|
}
|
|
if (ICS.ConversionKind == ImplicitConversionSequence::UserDefinedConversion &&
|
|
ICS.UserDefined.After.ReferenceBinding) {
|
|
assert(ICS.UserDefined.After.DirectBinding &&
|
|
"TryClassUnification should never generate indirect ref bindings");
|
|
return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
|
|
TargetType(ICS)),
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false);
|
|
}
|
|
if (Self.PerformImplicitConversion(E, TargetType(ICS), ICS, "converting"))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/// \brief Check the operands of ?: under C++ semantics.
|
|
///
|
|
/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
|
|
/// extension. In this case, LHS == Cond. (But they're not aliases.)
|
|
QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
|
|
SourceLocation QuestionLoc) {
|
|
// FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
|
|
// interface pointers.
|
|
|
|
// C++0x 5.16p1
|
|
// The first expression is contextually converted to bool.
|
|
if (!Cond->isTypeDependent()) {
|
|
if (CheckCXXBooleanCondition(Cond))
|
|
return QualType();
|
|
}
|
|
|
|
// Either of the arguments dependent?
|
|
if (LHS->isTypeDependent() || RHS->isTypeDependent())
|
|
return Context.DependentTy;
|
|
|
|
// C++0x 5.16p2
|
|
// If either the second or the third operand has type (cv) void, ...
|
|
QualType LTy = LHS->getType();
|
|
QualType RTy = RHS->getType();
|
|
bool LVoid = LTy->isVoidType();
|
|
bool RVoid = RTy->isVoidType();
|
|
if (LVoid || RVoid) {
|
|
// ... then the [l2r] conversions are performed on the second and third
|
|
// operands ...
|
|
DefaultFunctionArrayConversion(LHS);
|
|
DefaultFunctionArrayConversion(RHS);
|
|
LTy = LHS->getType();
|
|
RTy = RHS->getType();
|
|
|
|
// ... and one of the following shall hold:
|
|
// -- The second or the third operand (but not both) is a throw-
|
|
// expression; the result is of the type of the other and is an rvalue.
|
|
bool LThrow = isa<CXXThrowExpr>(LHS);
|
|
bool RThrow = isa<CXXThrowExpr>(RHS);
|
|
if (LThrow && !RThrow)
|
|
return RTy;
|
|
if (RThrow && !LThrow)
|
|
return LTy;
|
|
|
|
// -- Both the second and third operands have type void; the result is of
|
|
// type void and is an rvalue.
|
|
if (LVoid && RVoid)
|
|
return Context.VoidTy;
|
|
|
|
// Neither holds, error.
|
|
Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
|
|
<< (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
|
|
<< LHS->getSourceRange() << RHS->getSourceRange();
|
|
return QualType();
|
|
}
|
|
|
|
// Neither is void.
|
|
|
|
// C++0x 5.16p3
|
|
// Otherwise, if the second and third operand have different types, and
|
|
// either has (cv) class type, and attempt is made to convert each of those
|
|
// operands to the other.
|
|
if (Context.getCanonicalType(LTy) != Context.getCanonicalType(RTy) &&
|
|
(LTy->isRecordType() || RTy->isRecordType())) {
|
|
ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
|
|
// These return true if a single direction is already ambiguous.
|
|
if (TryClassUnification(*this, LHS, RHS, QuestionLoc, ICSLeftToRight))
|
|
return QualType();
|
|
if (TryClassUnification(*this, RHS, LHS, QuestionLoc, ICSRightToLeft))
|
|
return QualType();
|
|
|
|
bool HaveL2R = ICSLeftToRight.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion;
|
|
bool HaveR2L = ICSRightToLeft.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion;
|
|
// If both can be converted, [...] the program is ill-formed.
|
|
if (HaveL2R && HaveR2L) {
|
|
Diag(QuestionLoc, diag::err_conditional_ambiguous)
|
|
<< LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange();
|
|
return QualType();
|
|
}
|
|
|
|
// If exactly one conversion is possible, that conversion is applied to
|
|
// the chosen operand and the converted operands are used in place of the
|
|
// original operands for the remainder of this section.
|
|
if (HaveL2R) {
|
|
if (ConvertForConditional(*this, LHS, ICSLeftToRight))
|
|
return QualType();
|
|
LTy = LHS->getType();
|
|
} else if (HaveR2L) {
|
|
if (ConvertForConditional(*this, RHS, ICSRightToLeft))
|
|
return QualType();
|
|
RTy = RHS->getType();
|
|
}
|
|
}
|
|
|
|
// C++0x 5.16p4
|
|
// If the second and third operands are lvalues and have the same type,
|
|
// the result is of that type [...]
|
|
bool Same = Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy);
|
|
if (Same && LHS->isLvalue(Context) == Expr::LV_Valid &&
|
|
RHS->isLvalue(Context) == Expr::LV_Valid)
|
|
return LTy;
|
|
|
|
// C++0x 5.16p5
|
|
// Otherwise, the result is an rvalue. If the second and third operands
|
|
// do not have the same type, and either has (cv) class type, ...
|
|
if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
|
|
// ... overload resolution is used to determine the conversions (if any)
|
|
// to be applied to the operands. If the overload resolution fails, the
|
|
// program is ill-formed.
|
|
if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
|
|
return QualType();
|
|
}
|
|
|
|
// C++0x 5.16p6
|
|
// LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
|
|
// conversions are performed on the second and third operands.
|
|
DefaultFunctionArrayConversion(LHS);
|
|
DefaultFunctionArrayConversion(RHS);
|
|
LTy = LHS->getType();
|
|
RTy = RHS->getType();
|
|
|
|
// After those conversions, one of the following shall hold:
|
|
// -- The second and third operands have the same type; the result
|
|
// is of that type.
|
|
if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy))
|
|
return LTy;
|
|
|
|
// -- The second and third operands have arithmetic or enumeration type;
|
|
// the usual arithmetic conversions are performed to bring them to a
|
|
// common type, and the result is of that type.
|
|
if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
|
|
UsualArithmeticConversions(LHS, RHS);
|
|
return LHS->getType();
|
|
}
|
|
|
|
// -- The second and third operands have pointer type, or one has pointer
|
|
// type and the other is a null pointer constant; pointer conversions
|
|
// and qualification conversions are performed to bring them to their
|
|
// composite pointer type. The result is of the composite pointer type.
|
|
QualType Composite = FindCompositePointerType(LHS, RHS);
|
|
if (!Composite.isNull())
|
|
return Composite;
|
|
|
|
// Fourth bullet is same for pointers-to-member. However, the possible
|
|
// conversions are far more limited: we have null-to-pointer, upcast of
|
|
// containing class, and second-level cv-ness.
|
|
// cv-ness is not a union, but must match one of the two operands. (Which,
|
|
// frankly, is stupid.)
|
|
const MemberPointerType *LMemPtr = LTy->getAs<MemberPointerType>();
|
|
const MemberPointerType *RMemPtr = RTy->getAs<MemberPointerType>();
|
|
if (LMemPtr && RHS->isNullPointerConstant(Context)) {
|
|
ImpCastExprToType(RHS, LTy);
|
|
return LTy;
|
|
}
|
|
if (RMemPtr && LHS->isNullPointerConstant(Context)) {
|
|
ImpCastExprToType(LHS, RTy);
|
|
return RTy;
|
|
}
|
|
if (LMemPtr && RMemPtr) {
|
|
QualType LPointee = LMemPtr->getPointeeType();
|
|
QualType RPointee = RMemPtr->getPointeeType();
|
|
// First, we check that the unqualified pointee type is the same. If it's
|
|
// not, there's no conversion that will unify the two pointers.
|
|
if (Context.getCanonicalType(LPointee).getUnqualifiedType() ==
|
|
Context.getCanonicalType(RPointee).getUnqualifiedType()) {
|
|
// Second, we take the greater of the two cv qualifications. If neither
|
|
// is greater than the other, the conversion is not possible.
|
|
unsigned Q = LPointee.getCVRQualifiers() | RPointee.getCVRQualifiers();
|
|
if (Q == LPointee.getCVRQualifiers() || Q == RPointee.getCVRQualifiers()){
|
|
// Third, we check if either of the container classes is derived from
|
|
// the other.
|
|
QualType LContainer(LMemPtr->getClass(), 0);
|
|
QualType RContainer(RMemPtr->getClass(), 0);
|
|
QualType MoreDerived;
|
|
if (Context.getCanonicalType(LContainer) ==
|
|
Context.getCanonicalType(RContainer))
|
|
MoreDerived = LContainer;
|
|
else if (IsDerivedFrom(LContainer, RContainer))
|
|
MoreDerived = LContainer;
|
|
else if (IsDerivedFrom(RContainer, LContainer))
|
|
MoreDerived = RContainer;
|
|
|
|
if (!MoreDerived.isNull()) {
|
|
// The type 'Q Pointee (MoreDerived::*)' is the common type.
|
|
// We don't use ImpCastExprToType here because this could still fail
|
|
// for ambiguous or inaccessible conversions.
|
|
QualType Common = Context.getMemberPointerType(
|
|
LPointee.getQualifiedType(Q), MoreDerived.getTypePtr());
|
|
if (PerformImplicitConversion(LHS, Common, "converting"))
|
|
return QualType();
|
|
if (PerformImplicitConversion(RHS, Common, "converting"))
|
|
return QualType();
|
|
return Common;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
|
|
<< LHS->getType() << RHS->getType()
|
|
<< LHS->getSourceRange() << RHS->getSourceRange();
|
|
return QualType();
|
|
}
|
|
|
|
/// \brief Find a merged pointer type and convert the two expressions to it.
|
|
///
|
|
/// This finds the composite pointer type (or member pointer type) for @p E1
|
|
/// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
|
|
/// type and returns it.
|
|
/// It does not emit diagnostics.
|
|
QualType Sema::FindCompositePointerType(Expr *&E1, Expr *&E2) {
|
|
assert(getLangOptions().CPlusPlus && "This function assumes C++");
|
|
QualType T1 = E1->getType(), T2 = E2->getType();
|
|
|
|
if (!T1->isPointerType() && !T1->isMemberPointerType() &&
|
|
!T2->isPointerType() && !T2->isMemberPointerType())
|
|
return QualType();
|
|
|
|
// FIXME: Do we need to work on the canonical types?
|
|
|
|
// C++0x 5.9p2
|
|
// Pointer conversions and qualification conversions are performed on
|
|
// pointer operands to bring them to their composite pointer type. If
|
|
// one operand is a null pointer constant, the composite pointer type is
|
|
// the type of the other operand.
|
|
if (E1->isNullPointerConstant(Context)) {
|
|
ImpCastExprToType(E1, T2);
|
|
return T2;
|
|
}
|
|
if (E2->isNullPointerConstant(Context)) {
|
|
ImpCastExprToType(E2, T1);
|
|
return T1;
|
|
}
|
|
|
|
// Now both have to be pointers or member pointers.
|
|
if (!T1->isPointerType() && !T1->isMemberPointerType() &&
|
|
!T2->isPointerType() && !T2->isMemberPointerType())
|
|
return QualType();
|
|
|
|
// Otherwise, of one of the operands has type "pointer to cv1 void," then
|
|
// the other has type "pointer to cv2 T" and the composite pointer type is
|
|
// "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
|
|
// Otherwise, the composite pointer type is a pointer type similar to the
|
|
// type of one of the operands, with a cv-qualification signature that is
|
|
// the union of the cv-qualification signatures of the operand types.
|
|
// In practice, the first part here is redundant; it's subsumed by the second.
|
|
// What we do here is, we build the two possible composite types, and try the
|
|
// conversions in both directions. If only one works, or if the two composite
|
|
// types are the same, we have succeeded.
|
|
llvm::SmallVector<unsigned, 4> QualifierUnion;
|
|
llvm::SmallVector<std::pair<const Type *, const Type *>, 4> MemberOfClass;
|
|
QualType Composite1 = T1, Composite2 = T2;
|
|
do {
|
|
const PointerType *Ptr1, *Ptr2;
|
|
if ((Ptr1 = Composite1->getAs<PointerType>()) &&
|
|
(Ptr2 = Composite2->getAs<PointerType>())) {
|
|
Composite1 = Ptr1->getPointeeType();
|
|
Composite2 = Ptr2->getPointeeType();
|
|
QualifierUnion.push_back(
|
|
Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
|
|
MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
|
|
continue;
|
|
}
|
|
|
|
const MemberPointerType *MemPtr1, *MemPtr2;
|
|
if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
|
|
(MemPtr2 = Composite2->getAs<MemberPointerType>())) {
|
|
Composite1 = MemPtr1->getPointeeType();
|
|
Composite2 = MemPtr2->getPointeeType();
|
|
QualifierUnion.push_back(
|
|
Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
|
|
MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
|
|
MemPtr2->getClass()));
|
|
continue;
|
|
}
|
|
|
|
// FIXME: block pointer types?
|
|
|
|
// Cannot unwrap any more types.
|
|
break;
|
|
} while (true);
|
|
|
|
// Rewrap the composites as pointers or member pointers with the union CVRs.
|
|
llvm::SmallVector<std::pair<const Type *, const Type *>, 4>::iterator MOC
|
|
= MemberOfClass.begin();
|
|
for (llvm::SmallVector<unsigned, 4>::iterator
|
|
I = QualifierUnion.begin(),
|
|
E = QualifierUnion.end();
|
|
I != E; (void)++I, ++MOC) {
|
|
if (MOC->first && MOC->second) {
|
|
// Rebuild member pointer type
|
|
Composite1 = Context.getMemberPointerType(Composite1.getQualifiedType(*I),
|
|
MOC->first);
|
|
Composite2 = Context.getMemberPointerType(Composite2.getQualifiedType(*I),
|
|
MOC->second);
|
|
} else {
|
|
// Rebuild pointer type
|
|
Composite1 = Context.getPointerType(Composite1.getQualifiedType(*I));
|
|
Composite2 = Context.getPointerType(Composite2.getQualifiedType(*I));
|
|
}
|
|
}
|
|
|
|
ImplicitConversionSequence E1ToC1 =
|
|
TryImplicitConversion(E1, Composite1,
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
ImplicitConversionSequence E2ToC1 =
|
|
TryImplicitConversion(E2, Composite1,
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
|
|
ImplicitConversionSequence E1ToC2, E2ToC2;
|
|
E1ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
|
|
E2ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
|
|
if (Context.getCanonicalType(Composite1) !=
|
|
Context.getCanonicalType(Composite2)) {
|
|
E1ToC2 = TryImplicitConversion(E1, Composite2,
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
E2ToC2 = TryImplicitConversion(E2, Composite2,
|
|
/*SuppressUserConversions=*/false,
|
|
/*AllowExplicit=*/false,
|
|
/*ForceRValue=*/false,
|
|
/*InOverloadResolution=*/false);
|
|
}
|
|
|
|
bool ToC1Viable = E1ToC1.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion
|
|
&& E2ToC1.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion;
|
|
bool ToC2Viable = E1ToC2.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion
|
|
&& E2ToC2.ConversionKind !=
|
|
ImplicitConversionSequence::BadConversion;
|
|
if (ToC1Viable && !ToC2Viable) {
|
|
if (!PerformImplicitConversion(E1, Composite1, E1ToC1, "converting") &&
|
|
!PerformImplicitConversion(E2, Composite1, E2ToC1, "converting"))
|
|
return Composite1;
|
|
}
|
|
if (ToC2Viable && !ToC1Viable) {
|
|
if (!PerformImplicitConversion(E1, Composite2, E1ToC2, "converting") &&
|
|
!PerformImplicitConversion(E2, Composite2, E2ToC2, "converting"))
|
|
return Composite2;
|
|
}
|
|
return QualType();
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::MaybeBindToTemporary(Expr *E) {
|
|
if (!Context.getLangOptions().CPlusPlus)
|
|
return Owned(E);
|
|
|
|
const RecordType *RT = E->getType()->getAs<RecordType>();
|
|
if (!RT)
|
|
return Owned(E);
|
|
|
|
CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
|
|
if (RD->hasTrivialDestructor())
|
|
return Owned(E);
|
|
|
|
CXXTemporary *Temp = CXXTemporary::Create(Context,
|
|
RD->getDestructor(Context));
|
|
ExprTemporaries.push_back(Temp);
|
|
if (CXXDestructorDecl *Destructor =
|
|
const_cast<CXXDestructorDecl*>(RD->getDestructor(Context)))
|
|
MarkDeclarationReferenced(E->getExprLoc(), Destructor);
|
|
// FIXME: Add the temporary to the temporaries vector.
|
|
return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
|
|
}
|
|
|
|
Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr,
|
|
bool ShouldDestroyTemps) {
|
|
assert(SubExpr && "sub expression can't be null!");
|
|
|
|
if (ExprTemporaries.empty())
|
|
return SubExpr;
|
|
|
|
Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
|
|
&ExprTemporaries[0],
|
|
ExprTemporaries.size(),
|
|
ShouldDestroyTemps);
|
|
ExprTemporaries.clear();
|
|
|
|
return E;
|
|
}
|
|
|
|
Sema::OwningExprResult
|
|
Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
|
|
tok::TokenKind OpKind, TypeTy *&ObjectType) {
|
|
// Since this might be a postfix expression, get rid of ParenListExprs.
|
|
Base = MaybeConvertParenListExprToParenExpr(S, move(Base));
|
|
|
|
Expr *BaseExpr = (Expr*)Base.get();
|
|
assert(BaseExpr && "no record expansion");
|
|
|
|
QualType BaseType = BaseExpr->getType();
|
|
if (BaseType->isDependentType()) {
|
|
// FIXME: member of the current instantiation
|
|
ObjectType = BaseType.getAsOpaquePtr();
|
|
return move(Base);
|
|
}
|
|
|
|
// C++ [over.match.oper]p8:
|
|
// [...] When operator->returns, the operator-> is applied to the value
|
|
// returned, with the original second operand.
|
|
if (OpKind == tok::arrow) {
|
|
while (BaseType->isRecordType()) {
|
|
Base = BuildOverloadedArrowExpr(S, move(Base), BaseExpr->getExprLoc());
|
|
BaseExpr = (Expr*)Base.get();
|
|
if (BaseExpr == NULL)
|
|
return ExprError();
|
|
BaseType = BaseExpr->getType();
|
|
}
|
|
}
|
|
|
|
if (BaseType->isPointerType())
|
|
BaseType = BaseType->getPointeeType();
|
|
|
|
// We could end up with various non-record types here, such as extended
|
|
// vector types or Objective-C interfaces. Just return early and let
|
|
// ActOnMemberReferenceExpr do the work.
|
|
if (!BaseType->isRecordType()) {
|
|
// C++ [basic.lookup.classref]p2:
|
|
// [...] If the type of the object expression is of pointer to scalar
|
|
// type, the unqualified-id is looked up in the context of the complete
|
|
// postfix-expression.
|
|
ObjectType = 0;
|
|
return move(Base);
|
|
}
|
|
|
|
// C++ [basic.lookup.classref]p2:
|
|
// If the id-expression in a class member access (5.2.5) is an
|
|
// unqualified-id, and the type of the object expres- sion is of a class
|
|
// type C (or of pointer to a class type C), the unqualified-id is looked
|
|
// up in the scope of class C. [...]
|
|
ObjectType = BaseType.getAsOpaquePtr();
|
|
return move(Base);
|
|
}
|
|
|
|
Sema::OwningExprResult
|
|
Sema::ActOnDestructorReferenceExpr(Scope *S, ExprArg Base,
|
|
SourceLocation OpLoc,
|
|
tok::TokenKind OpKind,
|
|
SourceLocation ClassNameLoc,
|
|
IdentifierInfo *ClassName,
|
|
const CXXScopeSpec &SS,
|
|
bool HasTrailingLParen) {
|
|
if (SS.isInvalid())
|
|
return ExprError();
|
|
|
|
QualType BaseType;
|
|
if (isUnknownSpecialization(SS))
|
|
BaseType = Context.getTypenameType((NestedNameSpecifier *)SS.getScopeRep(),
|
|
ClassName);
|
|
else {
|
|
TypeTy *BaseTy = getTypeName(*ClassName, ClassNameLoc, S, &SS);
|
|
if (!BaseTy) {
|
|
Diag(ClassNameLoc, diag::err_ident_in_pseudo_dtor_not_a_type)
|
|
<< ClassName;
|
|
return ExprError();
|
|
}
|
|
|
|
BaseType = GetTypeFromParser(BaseTy);
|
|
}
|
|
|
|
CanQualType CanBaseType = Context.getCanonicalType(BaseType);
|
|
DeclarationName DtorName =
|
|
Context.DeclarationNames.getCXXDestructorName(CanBaseType);
|
|
|
|
OwningExprResult Result
|
|
= BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, ClassNameLoc,
|
|
DtorName, DeclPtrTy(), &SS);
|
|
if (Result.isInvalid() || HasTrailingLParen)
|
|
return move(Result);
|
|
|
|
// The only way a reference to a destructor can be used is to
|
|
// immediately call them. Since the next token is not a '(', produce a
|
|
// diagnostic and build the call now.
|
|
Expr *E = (Expr *)Result.get();
|
|
SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(E->getLocEnd());
|
|
Diag(E->getLocStart(), diag::err_dtor_expr_without_call)
|
|
<< isa<CXXPseudoDestructorExpr>(E)
|
|
<< CodeModificationHint::CreateInsertion(ExpectedLParenLoc, "()");
|
|
|
|
return ActOnCallExpr(0, move(Result), ExpectedLParenLoc,
|
|
MultiExprArg(*this, 0, 0), 0, ExpectedLParenLoc);
|
|
}
|
|
|
|
Sema::OwningExprResult
|
|
Sema::ActOnOverloadedOperatorReferenceExpr(Scope *S, ExprArg Base,
|
|
SourceLocation OpLoc,
|
|
tok::TokenKind OpKind,
|
|
SourceLocation ClassNameLoc,
|
|
OverloadedOperatorKind OverOpKind,
|
|
const CXXScopeSpec *SS) {
|
|
if (SS && SS->isInvalid())
|
|
return ExprError();
|
|
|
|
DeclarationName Name =
|
|
Context.DeclarationNames.getCXXOperatorName(OverOpKind);
|
|
|
|
return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, ClassNameLoc,
|
|
Name, DeclPtrTy(), SS);
|
|
}
|
|
|
|
Sema::OwningExprResult
|
|
Sema::ActOnConversionOperatorReferenceExpr(Scope *S, ExprArg Base,
|
|
SourceLocation OpLoc,
|
|
tok::TokenKind OpKind,
|
|
SourceLocation ClassNameLoc,
|
|
TypeTy *Ty,
|
|
const CXXScopeSpec *SS) {
|
|
if (SS && SS->isInvalid())
|
|
return ExprError();
|
|
|
|
//FIXME: Preserve type source info.
|
|
QualType ConvType = GetTypeFromParser(Ty);
|
|
CanQualType ConvTypeCanon = Context.getCanonicalType(ConvType);
|
|
DeclarationName ConvName =
|
|
Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
|
|
|
|
return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, ClassNameLoc,
|
|
ConvName, DeclPtrTy(), SS);
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::BuildCXXCastArgument(SourceLocation CastLoc,
|
|
QualType Ty,
|
|
CastExpr::CastKind Kind,
|
|
CXXMethodDecl *Method,
|
|
ExprArg Arg) {
|
|
Expr *From = Arg.takeAs<Expr>();
|
|
|
|
switch (Kind) {
|
|
default: assert(0 && "Unhandled cast kind!");
|
|
case CastExpr::CK_ConstructorConversion: {
|
|
ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
|
|
|
|
if (CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
|
|
MultiExprArg(*this, (void **)&From, 1),
|
|
CastLoc, ConstructorArgs))
|
|
return ExprError();
|
|
|
|
return BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
|
|
move_arg(ConstructorArgs));
|
|
}
|
|
|
|
case CastExpr::CK_UserDefinedConversion: {
|
|
// Create an implicit member expr to refer to the conversion operator.
|
|
MemberExpr *ME =
|
|
new (Context) MemberExpr(From, From->getType()->isPointerType(), Method,
|
|
SourceLocation(), Method->getType());
|
|
|
|
|
|
// And an implicit call expr that calls it.
|
|
QualType ResultType = Method->getResultType().getNonReferenceType();
|
|
CXXMemberCallExpr *CE =
|
|
new (Context) CXXMemberCallExpr(Context, ME, 0, 0,
|
|
ResultType,
|
|
SourceLocation());
|
|
|
|
return Owned(CE);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::ActOnFinishFullExpr(ExprArg Arg) {
|
|
Expr *FullExpr = Arg.takeAs<Expr>();
|
|
if (FullExpr)
|
|
FullExpr = MaybeCreateCXXExprWithTemporaries(FullExpr,
|
|
/*ShouldDestroyTemps=*/true);
|
|
|
|
|
|
return Owned(FullExpr);
|
|
}
|