1135 lines
42 KiB
C++
1135 lines
42 KiB
C++
//===--- SemaExceptionSpec.cpp - C++ Exception Specifications ---*- C++ -*-===//
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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 provides Sema routines for C++ exception specification testing.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/SemaInternal.h"
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#include "clang/AST/CXXInheritance.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/TypeLoc.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallString.h"
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namespace clang {
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static const FunctionProtoType *GetUnderlyingFunction(QualType T)
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{
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if (const PointerType *PtrTy = T->getAs<PointerType>())
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T = PtrTy->getPointeeType();
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else if (const ReferenceType *RefTy = T->getAs<ReferenceType>())
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T = RefTy->getPointeeType();
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else if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
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T = MPTy->getPointeeType();
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return T->getAs<FunctionProtoType>();
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}
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/// CheckSpecifiedExceptionType - Check if the given type is valid in an
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/// exception specification. Incomplete types, or pointers to incomplete types
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/// other than void are not allowed.
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///
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/// \param[in,out] T The exception type. This will be decayed to a pointer type
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/// when the input is an array or a function type.
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bool Sema::CheckSpecifiedExceptionType(QualType &T, const SourceRange &Range) {
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// C++11 [except.spec]p2:
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// A type cv T, "array of T", or "function returning T" denoted
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// in an exception-specification is adjusted to type T, "pointer to T", or
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// "pointer to function returning T", respectively.
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//
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// We also apply this rule in C++98.
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if (T->isArrayType())
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T = Context.getArrayDecayedType(T);
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else if (T->isFunctionType())
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T = Context.getPointerType(T);
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int Kind = 0;
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QualType PointeeT = T;
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if (const PointerType *PT = T->getAs<PointerType>()) {
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PointeeT = PT->getPointeeType();
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Kind = 1;
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// cv void* is explicitly permitted, despite being a pointer to an
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// incomplete type.
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if (PointeeT->isVoidType())
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return false;
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} else if (const ReferenceType *RT = T->getAs<ReferenceType>()) {
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PointeeT = RT->getPointeeType();
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Kind = 2;
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if (RT->isRValueReferenceType()) {
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// C++11 [except.spec]p2:
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// A type denoted in an exception-specification shall not denote [...]
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// an rvalue reference type.
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Diag(Range.getBegin(), diag::err_rref_in_exception_spec)
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<< T << Range;
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return true;
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}
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}
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// C++11 [except.spec]p2:
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// A type denoted in an exception-specification shall not denote an
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// incomplete type other than a class currently being defined [...].
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// A type denoted in an exception-specification shall not denote a
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// pointer or reference to an incomplete type, other than (cv) void* or a
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// pointer or reference to a class currently being defined.
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if (!(PointeeT->isRecordType() &&
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PointeeT->getAs<RecordType>()->isBeingDefined()) &&
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RequireCompleteType(Range.getBegin(), PointeeT,
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diag::err_incomplete_in_exception_spec, Kind, Range))
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return true;
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return false;
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}
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/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer
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/// to member to a function with an exception specification. This means that
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/// it is invalid to add another level of indirection.
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bool Sema::CheckDistantExceptionSpec(QualType T) {
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if (const PointerType *PT = T->getAs<PointerType>())
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T = PT->getPointeeType();
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else if (const MemberPointerType *PT = T->getAs<MemberPointerType>())
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T = PT->getPointeeType();
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else
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return false;
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const FunctionProtoType *FnT = T->getAs<FunctionProtoType>();
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if (!FnT)
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return false;
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return FnT->hasExceptionSpec();
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}
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const FunctionProtoType *
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Sema::ResolveExceptionSpec(SourceLocation Loc, const FunctionProtoType *FPT) {
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if (!isUnresolvedExceptionSpec(FPT->getExceptionSpecType()))
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return FPT;
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FunctionDecl *SourceDecl = FPT->getExceptionSpecDecl();
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const FunctionProtoType *SourceFPT =
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SourceDecl->getType()->castAs<FunctionProtoType>();
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// If the exception specification has already been resolved, just return it.
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if (!isUnresolvedExceptionSpec(SourceFPT->getExceptionSpecType()))
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return SourceFPT;
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// Compute or instantiate the exception specification now.
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if (SourceFPT->getExceptionSpecType() == EST_Unevaluated)
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EvaluateImplicitExceptionSpec(Loc, cast<CXXMethodDecl>(SourceDecl));
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else
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InstantiateExceptionSpec(Loc, SourceDecl);
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return SourceDecl->getType()->castAs<FunctionProtoType>();
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}
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/// Determine whether a function has an implicitly-generated exception
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/// specification.
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static bool hasImplicitExceptionSpec(FunctionDecl *Decl) {
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if (!isa<CXXDestructorDecl>(Decl) &&
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Decl->getDeclName().getCXXOverloadedOperator() != OO_Delete &&
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Decl->getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
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return false;
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// If the user didn't declare the function, its exception specification must
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// be implicit.
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if (!Decl->getTypeSourceInfo())
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return true;
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const FunctionProtoType *Ty =
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Decl->getTypeSourceInfo()->getType()->getAs<FunctionProtoType>();
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return !Ty->hasExceptionSpec();
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}
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bool Sema::CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New) {
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OverloadedOperatorKind OO = New->getDeclName().getCXXOverloadedOperator();
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bool IsOperatorNew = OO == OO_New || OO == OO_Array_New;
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bool MissingExceptionSpecification = false;
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bool MissingEmptyExceptionSpecification = false;
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unsigned DiagID = diag::err_mismatched_exception_spec;
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if (getLangOpts().MicrosoftExt)
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DiagID = diag::warn_mismatched_exception_spec;
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// Check the types as written: they must match before any exception
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// specification adjustment is applied.
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if (!CheckEquivalentExceptionSpec(
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PDiag(DiagID), PDiag(diag::note_previous_declaration),
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Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(),
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New->getType()->getAs<FunctionProtoType>(), New->getLocation(),
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&MissingExceptionSpecification, &MissingEmptyExceptionSpecification,
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/*AllowNoexceptAllMatchWithNoSpec=*/true, IsOperatorNew)) {
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// C++11 [except.spec]p4 [DR1492]:
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// If a declaration of a function has an implicit
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// exception-specification, other declarations of the function shall
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// not specify an exception-specification.
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if (getLangOpts().CPlusPlus11 &&
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hasImplicitExceptionSpec(Old) != hasImplicitExceptionSpec(New)) {
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Diag(New->getLocation(), diag::ext_implicit_exception_spec_mismatch)
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<< hasImplicitExceptionSpec(Old);
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if (!Old->getLocation().isInvalid())
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Diag(Old->getLocation(), diag::note_previous_declaration);
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}
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return false;
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}
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// The failure was something other than an empty exception
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// specification; return an error.
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if (!MissingExceptionSpecification && !MissingEmptyExceptionSpecification)
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return true;
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const FunctionProtoType *NewProto =
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New->getType()->getAs<FunctionProtoType>();
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// The new function declaration is only missing an empty exception
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// specification "throw()". If the throw() specification came from a
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// function in a system header that has C linkage, just add an empty
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// exception specification to the "new" declaration. This is an
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// egregious workaround for glibc, which adds throw() specifications
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// to many libc functions as an optimization. Unfortunately, that
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// optimization isn't permitted by the C++ standard, so we're forced
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// to work around it here.
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if (MissingEmptyExceptionSpecification && NewProto &&
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(Old->getLocation().isInvalid() ||
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Context.getSourceManager().isInSystemHeader(Old->getLocation())) &&
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Old->isExternC()) {
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FunctionProtoType::ExtProtoInfo EPI = NewProto->getExtProtoInfo();
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EPI.ExceptionSpecType = EST_DynamicNone;
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QualType NewType =
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Context.getFunctionType(NewProto->getResultType(),
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ArrayRef<QualType>(NewProto->arg_type_begin(),
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NewProto->getNumArgs()),
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EPI);
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New->setType(NewType);
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return false;
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}
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if (MissingExceptionSpecification && NewProto) {
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const FunctionProtoType *OldProto =
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Old->getType()->getAs<FunctionProtoType>();
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FunctionProtoType::ExtProtoInfo EPI = NewProto->getExtProtoInfo();
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EPI.ExceptionSpecType = OldProto->getExceptionSpecType();
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if (EPI.ExceptionSpecType == EST_Dynamic) {
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EPI.NumExceptions = OldProto->getNumExceptions();
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EPI.Exceptions = OldProto->exception_begin();
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} else if (EPI.ExceptionSpecType == EST_ComputedNoexcept) {
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// FIXME: We can't just take the expression from the old prototype. It
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// likely contains references to the old prototype's parameters.
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}
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// Update the type of the function with the appropriate exception
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// specification.
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QualType NewType =
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Context.getFunctionType(NewProto->getResultType(),
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ArrayRef<QualType>(NewProto->arg_type_begin(),
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NewProto->getNumArgs()),
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EPI);
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New->setType(NewType);
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// If exceptions are disabled, suppress the warning about missing
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// exception specifications for new and delete operators.
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if (!getLangOpts().CXXExceptions) {
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switch (New->getDeclName().getCXXOverloadedOperator()) {
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case OO_New:
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case OO_Array_New:
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case OO_Delete:
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case OO_Array_Delete:
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if (New->getDeclContext()->isTranslationUnit())
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return false;
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break;
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default:
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break;
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}
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}
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// Warn about the lack of exception specification.
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SmallString<128> ExceptionSpecString;
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llvm::raw_svector_ostream OS(ExceptionSpecString);
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switch (OldProto->getExceptionSpecType()) {
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case EST_DynamicNone:
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OS << "throw()";
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break;
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case EST_Dynamic: {
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OS << "throw(";
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bool OnFirstException = true;
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for (FunctionProtoType::exception_iterator E = OldProto->exception_begin(),
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EEnd = OldProto->exception_end();
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E != EEnd;
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++E) {
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if (OnFirstException)
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OnFirstException = false;
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else
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OS << ", ";
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OS << E->getAsString(getPrintingPolicy());
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}
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OS << ")";
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break;
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}
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case EST_BasicNoexcept:
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OS << "noexcept";
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break;
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case EST_ComputedNoexcept:
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OS << "noexcept(";
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OldProto->getNoexceptExpr()->printPretty(OS, 0, getPrintingPolicy());
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OS << ")";
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break;
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default:
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llvm_unreachable("This spec type is compatible with none.");
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}
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OS.flush();
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SourceLocation FixItLoc;
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if (TypeSourceInfo *TSInfo = New->getTypeSourceInfo()) {
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TypeLoc TL = TSInfo->getTypeLoc().IgnoreParens();
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if (FunctionTypeLoc FTLoc = TL.getAs<FunctionTypeLoc>())
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FixItLoc = PP.getLocForEndOfToken(FTLoc.getLocalRangeEnd());
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}
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if (FixItLoc.isInvalid())
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Diag(New->getLocation(), diag::warn_missing_exception_specification)
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<< New << OS.str();
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else {
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// FIXME: This will get more complicated with C++0x
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// late-specified return types.
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Diag(New->getLocation(), diag::warn_missing_exception_specification)
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<< New << OS.str()
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<< FixItHint::CreateInsertion(FixItLoc, " " + OS.str().str());
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}
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if (!Old->getLocation().isInvalid())
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Diag(Old->getLocation(), diag::note_previous_declaration);
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return false;
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}
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Diag(New->getLocation(), DiagID);
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Diag(Old->getLocation(), diag::note_previous_declaration);
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return true;
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}
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/// CheckEquivalentExceptionSpec - Check if the two types have equivalent
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/// exception specifications. Exception specifications are equivalent if
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/// they allow exactly the same set of exception types. It does not matter how
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/// that is achieved. See C++ [except.spec]p2.
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bool Sema::CheckEquivalentExceptionSpec(
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const FunctionProtoType *Old, SourceLocation OldLoc,
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const FunctionProtoType *New, SourceLocation NewLoc) {
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unsigned DiagID = diag::err_mismatched_exception_spec;
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if (getLangOpts().MicrosoftExt)
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DiagID = diag::warn_mismatched_exception_spec;
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return CheckEquivalentExceptionSpec(PDiag(DiagID),
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PDiag(diag::note_previous_declaration),
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Old, OldLoc, New, NewLoc);
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}
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/// CheckEquivalentExceptionSpec - Check if the two types have compatible
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/// exception specifications. See C++ [except.spec]p3.
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///
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/// \return \c false if the exception specifications match, \c true if there is
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/// a problem. If \c true is returned, either a diagnostic has already been
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/// produced or \c *MissingExceptionSpecification is set to \c true.
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bool Sema::CheckEquivalentExceptionSpec(const PartialDiagnostic &DiagID,
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const PartialDiagnostic & NoteID,
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const FunctionProtoType *Old,
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SourceLocation OldLoc,
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const FunctionProtoType *New,
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SourceLocation NewLoc,
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bool *MissingExceptionSpecification,
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bool*MissingEmptyExceptionSpecification,
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bool AllowNoexceptAllMatchWithNoSpec,
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bool IsOperatorNew) {
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// Just completely ignore this under -fno-exceptions.
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if (!getLangOpts().CXXExceptions)
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return false;
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if (MissingExceptionSpecification)
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*MissingExceptionSpecification = false;
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if (MissingEmptyExceptionSpecification)
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*MissingEmptyExceptionSpecification = false;
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Old = ResolveExceptionSpec(NewLoc, Old);
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if (!Old)
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return false;
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New = ResolveExceptionSpec(NewLoc, New);
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if (!New)
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return false;
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// C++0x [except.spec]p3: Two exception-specifications are compatible if:
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// - both are non-throwing, regardless of their form,
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// - both have the form noexcept(constant-expression) and the constant-
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// expressions are equivalent,
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// - both are dynamic-exception-specifications that have the same set of
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// adjusted types.
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//
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// C++0x [except.spec]p12: An exception-specifcation is non-throwing if it is
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// of the form throw(), noexcept, or noexcept(constant-expression) where the
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// constant-expression yields true.
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//
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// C++0x [except.spec]p4: If any declaration of a function has an exception-
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// specifier that is not a noexcept-specification allowing all exceptions,
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// all declarations [...] of that function shall have a compatible
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// exception-specification.
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//
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// That last point basically means that noexcept(false) matches no spec.
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// It's considered when AllowNoexceptAllMatchWithNoSpec is true.
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ExceptionSpecificationType OldEST = Old->getExceptionSpecType();
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ExceptionSpecificationType NewEST = New->getExceptionSpecType();
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assert(!isUnresolvedExceptionSpec(OldEST) &&
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!isUnresolvedExceptionSpec(NewEST) &&
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"Shouldn't see unknown exception specifications here");
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// Shortcut the case where both have no spec.
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if (OldEST == EST_None && NewEST == EST_None)
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return false;
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FunctionProtoType::NoexceptResult OldNR = Old->getNoexceptSpec(Context);
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FunctionProtoType::NoexceptResult NewNR = New->getNoexceptSpec(Context);
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if (OldNR == FunctionProtoType::NR_BadNoexcept ||
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NewNR == FunctionProtoType::NR_BadNoexcept)
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return false;
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// Dependent noexcept specifiers are compatible with each other, but nothing
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// else.
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// One noexcept is compatible with another if the argument is the same
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if (OldNR == NewNR &&
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OldNR != FunctionProtoType::NR_NoNoexcept &&
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NewNR != FunctionProtoType::NR_NoNoexcept)
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return false;
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if (OldNR != NewNR &&
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OldNR != FunctionProtoType::NR_NoNoexcept &&
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NewNR != FunctionProtoType::NR_NoNoexcept) {
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Diag(NewLoc, DiagID);
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if (NoteID.getDiagID() != 0)
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Diag(OldLoc, NoteID);
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return true;
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}
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// The MS extension throw(...) is compatible with itself.
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if (OldEST == EST_MSAny && NewEST == EST_MSAny)
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return false;
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// It's also compatible with no spec.
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if ((OldEST == EST_None && NewEST == EST_MSAny) ||
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(OldEST == EST_MSAny && NewEST == EST_None))
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return false;
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// It's also compatible with noexcept(false).
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if (OldEST == EST_MSAny && NewNR == FunctionProtoType::NR_Throw)
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return false;
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if (NewEST == EST_MSAny && OldNR == FunctionProtoType::NR_Throw)
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return false;
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// As described above, noexcept(false) matches no spec only for functions.
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if (AllowNoexceptAllMatchWithNoSpec) {
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if (OldEST == EST_None && NewNR == FunctionProtoType::NR_Throw)
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return false;
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if (NewEST == EST_None && OldNR == FunctionProtoType::NR_Throw)
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return false;
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}
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// Any non-throwing specifications are compatible.
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bool OldNonThrowing = OldNR == FunctionProtoType::NR_Nothrow ||
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OldEST == EST_DynamicNone;
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bool NewNonThrowing = NewNR == FunctionProtoType::NR_Nothrow ||
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NewEST == EST_DynamicNone;
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if (OldNonThrowing && NewNonThrowing)
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return false;
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// As a special compatibility feature, under C++0x we accept no spec and
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// throw(std::bad_alloc) as equivalent for operator new and operator new[].
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// This is because the implicit declaration changed, but old code would break.
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if (getLangOpts().CPlusPlus11 && IsOperatorNew) {
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const FunctionProtoType *WithExceptions = 0;
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if (OldEST == EST_None && NewEST == EST_Dynamic)
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WithExceptions = New;
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else if (OldEST == EST_Dynamic && NewEST == EST_None)
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WithExceptions = Old;
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if (WithExceptions && WithExceptions->getNumExceptions() == 1) {
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// One has no spec, the other throw(something). If that something is
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// std::bad_alloc, all conditions are met.
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QualType Exception = *WithExceptions->exception_begin();
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if (CXXRecordDecl *ExRecord = Exception->getAsCXXRecordDecl()) {
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IdentifierInfo* Name = ExRecord->getIdentifier();
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if (Name && Name->getName() == "bad_alloc") {
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// It's called bad_alloc, but is it in std?
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DeclContext* DC = ExRecord->getDeclContext();
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DC = DC->getEnclosingNamespaceContext();
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if (NamespaceDecl* NS = dyn_cast<NamespaceDecl>(DC)) {
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IdentifierInfo* NSName = NS->getIdentifier();
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DC = DC->getParent();
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if (NSName && NSName->getName() == "std" &&
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DC->getEnclosingNamespaceContext()->isTranslationUnit()) {
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return false;
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}
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}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// At this point, the only remaining valid case is two matching dynamic
|
|
// specifications. We return here unless both specifications are dynamic.
|
|
if (OldEST != EST_Dynamic || NewEST != EST_Dynamic) {
|
|
if (MissingExceptionSpecification && Old->hasExceptionSpec() &&
|
|
!New->hasExceptionSpec()) {
|
|
// The old type has an exception specification of some sort, but
|
|
// the new type does not.
|
|
*MissingExceptionSpecification = true;
|
|
|
|
if (MissingEmptyExceptionSpecification && OldNonThrowing) {
|
|
// The old type has a throw() or noexcept(true) exception specification
|
|
// and the new type has no exception specification, and the caller asked
|
|
// to handle this itself.
|
|
*MissingEmptyExceptionSpecification = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Diag(NewLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(OldLoc, NoteID);
|
|
return true;
|
|
}
|
|
|
|
assert(OldEST == EST_Dynamic && NewEST == EST_Dynamic &&
|
|
"Exception compatibility logic error: non-dynamic spec slipped through.");
|
|
|
|
bool Success = true;
|
|
// Both have a dynamic exception spec. Collect the first set, then compare
|
|
// to the second.
|
|
llvm::SmallPtrSet<CanQualType, 8> OldTypes, NewTypes;
|
|
for (FunctionProtoType::exception_iterator I = Old->exception_begin(),
|
|
E = Old->exception_end(); I != E; ++I)
|
|
OldTypes.insert(Context.getCanonicalType(*I).getUnqualifiedType());
|
|
|
|
for (FunctionProtoType::exception_iterator I = New->exception_begin(),
|
|
E = New->exception_end(); I != E && Success; ++I) {
|
|
CanQualType TypePtr = Context.getCanonicalType(*I).getUnqualifiedType();
|
|
if(OldTypes.count(TypePtr))
|
|
NewTypes.insert(TypePtr);
|
|
else
|
|
Success = false;
|
|
}
|
|
|
|
Success = Success && OldTypes.size() == NewTypes.size();
|
|
|
|
if (Success) {
|
|
return false;
|
|
}
|
|
Diag(NewLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(OldLoc, NoteID);
|
|
return true;
|
|
}
|
|
|
|
/// CheckExceptionSpecSubset - Check whether the second function type's
|
|
/// exception specification is a subset (or equivalent) of the first function
|
|
/// type. This is used by override and pointer assignment checks.
|
|
bool Sema::CheckExceptionSpecSubset(
|
|
const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
|
|
const FunctionProtoType *Superset, SourceLocation SuperLoc,
|
|
const FunctionProtoType *Subset, SourceLocation SubLoc) {
|
|
|
|
// Just auto-succeed under -fno-exceptions.
|
|
if (!getLangOpts().CXXExceptions)
|
|
return false;
|
|
|
|
// FIXME: As usual, we could be more specific in our error messages, but
|
|
// that better waits until we've got types with source locations.
|
|
|
|
if (!SubLoc.isValid())
|
|
SubLoc = SuperLoc;
|
|
|
|
// Resolve the exception specifications, if needed.
|
|
Superset = ResolveExceptionSpec(SuperLoc, Superset);
|
|
if (!Superset)
|
|
return false;
|
|
Subset = ResolveExceptionSpec(SubLoc, Subset);
|
|
if (!Subset)
|
|
return false;
|
|
|
|
ExceptionSpecificationType SuperEST = Superset->getExceptionSpecType();
|
|
|
|
// If superset contains everything, we're done.
|
|
if (SuperEST == EST_None || SuperEST == EST_MSAny)
|
|
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
|
|
|
|
// If there are dependent noexcept specs, assume everything is fine. Unlike
|
|
// with the equivalency check, this is safe in this case, because we don't
|
|
// want to merge declarations. Checks after instantiation will catch any
|
|
// omissions we make here.
|
|
// We also shortcut checking if a noexcept expression was bad.
|
|
|
|
FunctionProtoType::NoexceptResult SuperNR =Superset->getNoexceptSpec(Context);
|
|
if (SuperNR == FunctionProtoType::NR_BadNoexcept ||
|
|
SuperNR == FunctionProtoType::NR_Dependent)
|
|
return false;
|
|
|
|
// Another case of the superset containing everything.
|
|
if (SuperNR == FunctionProtoType::NR_Throw)
|
|
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
|
|
|
|
ExceptionSpecificationType SubEST = Subset->getExceptionSpecType();
|
|
|
|
assert(!isUnresolvedExceptionSpec(SuperEST) &&
|
|
!isUnresolvedExceptionSpec(SubEST) &&
|
|
"Shouldn't see unknown exception specifications here");
|
|
|
|
// It does not. If the subset contains everything, we've failed.
|
|
if (SubEST == EST_None || SubEST == EST_MSAny) {
|
|
Diag(SubLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(SuperLoc, NoteID);
|
|
return true;
|
|
}
|
|
|
|
FunctionProtoType::NoexceptResult SubNR = Subset->getNoexceptSpec(Context);
|
|
if (SubNR == FunctionProtoType::NR_BadNoexcept ||
|
|
SubNR == FunctionProtoType::NR_Dependent)
|
|
return false;
|
|
|
|
// Another case of the subset containing everything.
|
|
if (SubNR == FunctionProtoType::NR_Throw) {
|
|
Diag(SubLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(SuperLoc, NoteID);
|
|
return true;
|
|
}
|
|
|
|
// If the subset contains nothing, we're done.
|
|
if (SubEST == EST_DynamicNone || SubNR == FunctionProtoType::NR_Nothrow)
|
|
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
|
|
|
|
// Otherwise, if the superset contains nothing, we've failed.
|
|
if (SuperEST == EST_DynamicNone || SuperNR == FunctionProtoType::NR_Nothrow) {
|
|
Diag(SubLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(SuperLoc, NoteID);
|
|
return true;
|
|
}
|
|
|
|
assert(SuperEST == EST_Dynamic && SubEST == EST_Dynamic &&
|
|
"Exception spec subset: non-dynamic case slipped through.");
|
|
|
|
// Neither contains everything or nothing. Do a proper comparison.
|
|
for (FunctionProtoType::exception_iterator SubI = Subset->exception_begin(),
|
|
SubE = Subset->exception_end(); SubI != SubE; ++SubI) {
|
|
// Take one type from the subset.
|
|
QualType CanonicalSubT = Context.getCanonicalType(*SubI);
|
|
// Unwrap pointers and references so that we can do checks within a class
|
|
// hierarchy. Don't unwrap member pointers; they don't have hierarchy
|
|
// conversions on the pointee.
|
|
bool SubIsPointer = false;
|
|
if (const ReferenceType *RefTy = CanonicalSubT->getAs<ReferenceType>())
|
|
CanonicalSubT = RefTy->getPointeeType();
|
|
if (const PointerType *PtrTy = CanonicalSubT->getAs<PointerType>()) {
|
|
CanonicalSubT = PtrTy->getPointeeType();
|
|
SubIsPointer = true;
|
|
}
|
|
bool SubIsClass = CanonicalSubT->isRecordType();
|
|
CanonicalSubT = CanonicalSubT.getLocalUnqualifiedType();
|
|
|
|
CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
|
|
/*DetectVirtual=*/false);
|
|
|
|
bool Contained = false;
|
|
// Make sure it's in the superset.
|
|
for (FunctionProtoType::exception_iterator SuperI =
|
|
Superset->exception_begin(), SuperE = Superset->exception_end();
|
|
SuperI != SuperE; ++SuperI) {
|
|
QualType CanonicalSuperT = Context.getCanonicalType(*SuperI);
|
|
// SubT must be SuperT or derived from it, or pointer or reference to
|
|
// such types.
|
|
if (const ReferenceType *RefTy = CanonicalSuperT->getAs<ReferenceType>())
|
|
CanonicalSuperT = RefTy->getPointeeType();
|
|
if (SubIsPointer) {
|
|
if (const PointerType *PtrTy = CanonicalSuperT->getAs<PointerType>())
|
|
CanonicalSuperT = PtrTy->getPointeeType();
|
|
else {
|
|
continue;
|
|
}
|
|
}
|
|
CanonicalSuperT = CanonicalSuperT.getLocalUnqualifiedType();
|
|
// If the types are the same, move on to the next type in the subset.
|
|
if (CanonicalSubT == CanonicalSuperT) {
|
|
Contained = true;
|
|
break;
|
|
}
|
|
|
|
// Otherwise we need to check the inheritance.
|
|
if (!SubIsClass || !CanonicalSuperT->isRecordType())
|
|
continue;
|
|
|
|
Paths.clear();
|
|
if (!IsDerivedFrom(CanonicalSubT, CanonicalSuperT, Paths))
|
|
continue;
|
|
|
|
if (Paths.isAmbiguous(Context.getCanonicalType(CanonicalSuperT)))
|
|
continue;
|
|
|
|
// Do this check from a context without privileges.
|
|
switch (CheckBaseClassAccess(SourceLocation(),
|
|
CanonicalSuperT, CanonicalSubT,
|
|
Paths.front(),
|
|
/*Diagnostic*/ 0,
|
|
/*ForceCheck*/ true,
|
|
/*ForceUnprivileged*/ true)) {
|
|
case AR_accessible: break;
|
|
case AR_inaccessible: continue;
|
|
case AR_dependent:
|
|
llvm_unreachable("access check dependent for unprivileged context");
|
|
case AR_delayed:
|
|
llvm_unreachable("access check delayed in non-declaration");
|
|
}
|
|
|
|
Contained = true;
|
|
break;
|
|
}
|
|
if (!Contained) {
|
|
Diag(SubLoc, DiagID);
|
|
if (NoteID.getDiagID() != 0)
|
|
Diag(SuperLoc, NoteID);
|
|
return true;
|
|
}
|
|
}
|
|
// We've run half the gauntlet.
|
|
return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
|
|
}
|
|
|
|
static bool CheckSpecForTypesEquivalent(Sema &S,
|
|
const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
|
|
QualType Target, SourceLocation TargetLoc,
|
|
QualType Source, SourceLocation SourceLoc)
|
|
{
|
|
const FunctionProtoType *TFunc = GetUnderlyingFunction(Target);
|
|
if (!TFunc)
|
|
return false;
|
|
const FunctionProtoType *SFunc = GetUnderlyingFunction(Source);
|
|
if (!SFunc)
|
|
return false;
|
|
|
|
return S.CheckEquivalentExceptionSpec(DiagID, NoteID, TFunc, TargetLoc,
|
|
SFunc, SourceLoc);
|
|
}
|
|
|
|
/// CheckParamExceptionSpec - Check if the parameter and return types of the
|
|
/// two functions have equivalent exception specs. This is part of the
|
|
/// assignment and override compatibility check. We do not check the parameters
|
|
/// of parameter function pointers recursively, as no sane programmer would
|
|
/// even be able to write such a function type.
|
|
bool Sema::CheckParamExceptionSpec(const PartialDiagnostic & NoteID,
|
|
const FunctionProtoType *Target, SourceLocation TargetLoc,
|
|
const FunctionProtoType *Source, SourceLocation SourceLoc)
|
|
{
|
|
if (CheckSpecForTypesEquivalent(*this,
|
|
PDiag(diag::err_deep_exception_specs_differ) << 0,
|
|
PDiag(),
|
|
Target->getResultType(), TargetLoc,
|
|
Source->getResultType(), SourceLoc))
|
|
return true;
|
|
|
|
// We shouldn't even be testing this unless the arguments are otherwise
|
|
// compatible.
|
|
assert(Target->getNumArgs() == Source->getNumArgs() &&
|
|
"Functions have different argument counts.");
|
|
for (unsigned i = 0, E = Target->getNumArgs(); i != E; ++i) {
|
|
if (CheckSpecForTypesEquivalent(*this,
|
|
PDiag(diag::err_deep_exception_specs_differ) << 1,
|
|
PDiag(),
|
|
Target->getArgType(i), TargetLoc,
|
|
Source->getArgType(i), SourceLoc))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Sema::CheckExceptionSpecCompatibility(Expr *From, QualType ToType)
|
|
{
|
|
// First we check for applicability.
|
|
// Target type must be a function, function pointer or function reference.
|
|
const FunctionProtoType *ToFunc = GetUnderlyingFunction(ToType);
|
|
if (!ToFunc)
|
|
return false;
|
|
|
|
// SourceType must be a function or function pointer.
|
|
const FunctionProtoType *FromFunc = GetUnderlyingFunction(From->getType());
|
|
if (!FromFunc)
|
|
return false;
|
|
|
|
// Now we've got the correct types on both sides, check their compatibility.
|
|
// This means that the source of the conversion can only throw a subset of
|
|
// the exceptions of the target, and any exception specs on arguments or
|
|
// return types must be equivalent.
|
|
return CheckExceptionSpecSubset(PDiag(diag::err_incompatible_exception_specs),
|
|
PDiag(), ToFunc,
|
|
From->getSourceRange().getBegin(),
|
|
FromFunc, SourceLocation());
|
|
}
|
|
|
|
bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
|
|
const CXXMethodDecl *Old) {
|
|
if (getLangOpts().CPlusPlus11 && isa<CXXDestructorDecl>(New)) {
|
|
// Don't check uninstantiated template destructors at all. We can only
|
|
// synthesize correct specs after the template is instantiated.
|
|
if (New->getParent()->isDependentType())
|
|
return false;
|
|
if (New->getParent()->isBeingDefined()) {
|
|
// The destructor might be updated once the definition is finished. So
|
|
// remember it and check later.
|
|
DelayedDestructorExceptionSpecChecks.push_back(std::make_pair(
|
|
cast<CXXDestructorDecl>(New), cast<CXXDestructorDecl>(Old)));
|
|
return false;
|
|
}
|
|
}
|
|
unsigned DiagID = diag::err_override_exception_spec;
|
|
if (getLangOpts().MicrosoftExt)
|
|
DiagID = diag::warn_override_exception_spec;
|
|
return CheckExceptionSpecSubset(PDiag(DiagID),
|
|
PDiag(diag::note_overridden_virtual_function),
|
|
Old->getType()->getAs<FunctionProtoType>(),
|
|
Old->getLocation(),
|
|
New->getType()->getAs<FunctionProtoType>(),
|
|
New->getLocation());
|
|
}
|
|
|
|
static CanThrowResult canSubExprsThrow(Sema &S, const Expr *CE) {
|
|
Expr *E = const_cast<Expr*>(CE);
|
|
CanThrowResult R = CT_Cannot;
|
|
for (Expr::child_range I = E->children(); I && R != CT_Can; ++I)
|
|
R = mergeCanThrow(R, S.canThrow(cast<Expr>(*I)));
|
|
return R;
|
|
}
|
|
|
|
static CanThrowResult canCalleeThrow(Sema &S, const Expr *E,
|
|
const Decl *D,
|
|
bool NullThrows = true) {
|
|
if (!D)
|
|
return NullThrows ? CT_Can : CT_Cannot;
|
|
|
|
// See if we can get a function type from the decl somehow.
|
|
const ValueDecl *VD = dyn_cast<ValueDecl>(D);
|
|
if (!VD) // If we have no clue what we're calling, assume the worst.
|
|
return CT_Can;
|
|
|
|
// As an extension, we assume that __attribute__((nothrow)) functions don't
|
|
// throw.
|
|
if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>())
|
|
return CT_Cannot;
|
|
|
|
QualType T = VD->getType();
|
|
const FunctionProtoType *FT;
|
|
if ((FT = T->getAs<FunctionProtoType>())) {
|
|
} else if (const PointerType *PT = T->getAs<PointerType>())
|
|
FT = PT->getPointeeType()->getAs<FunctionProtoType>();
|
|
else if (const ReferenceType *RT = T->getAs<ReferenceType>())
|
|
FT = RT->getPointeeType()->getAs<FunctionProtoType>();
|
|
else if (const MemberPointerType *MT = T->getAs<MemberPointerType>())
|
|
FT = MT->getPointeeType()->getAs<FunctionProtoType>();
|
|
else if (const BlockPointerType *BT = T->getAs<BlockPointerType>())
|
|
FT = BT->getPointeeType()->getAs<FunctionProtoType>();
|
|
|
|
if (!FT)
|
|
return CT_Can;
|
|
|
|
FT = S.ResolveExceptionSpec(E->getLocStart(), FT);
|
|
if (!FT)
|
|
return CT_Can;
|
|
|
|
return FT->isNothrow(S.Context) ? CT_Cannot : CT_Can;
|
|
}
|
|
|
|
static CanThrowResult canDynamicCastThrow(const CXXDynamicCastExpr *DC) {
|
|
if (DC->isTypeDependent())
|
|
return CT_Dependent;
|
|
|
|
if (!DC->getTypeAsWritten()->isReferenceType())
|
|
return CT_Cannot;
|
|
|
|
if (DC->getSubExpr()->isTypeDependent())
|
|
return CT_Dependent;
|
|
|
|
return DC->getCastKind() == clang::CK_Dynamic? CT_Can : CT_Cannot;
|
|
}
|
|
|
|
static CanThrowResult canTypeidThrow(Sema &S, const CXXTypeidExpr *DC) {
|
|
if (DC->isTypeOperand())
|
|
return CT_Cannot;
|
|
|
|
Expr *Op = DC->getExprOperand();
|
|
if (Op->isTypeDependent())
|
|
return CT_Dependent;
|
|
|
|
const RecordType *RT = Op->getType()->getAs<RecordType>();
|
|
if (!RT)
|
|
return CT_Cannot;
|
|
|
|
if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic())
|
|
return CT_Cannot;
|
|
|
|
if (Op->Classify(S.Context).isPRValue())
|
|
return CT_Cannot;
|
|
|
|
return CT_Can;
|
|
}
|
|
|
|
CanThrowResult Sema::canThrow(const Expr *E) {
|
|
// C++ [expr.unary.noexcept]p3:
|
|
// [Can throw] if in a potentially-evaluated context the expression would
|
|
// contain:
|
|
switch (E->getStmtClass()) {
|
|
case Expr::CXXThrowExprClass:
|
|
// - a potentially evaluated throw-expression
|
|
return CT_Can;
|
|
|
|
case Expr::CXXDynamicCastExprClass: {
|
|
// - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v),
|
|
// where T is a reference type, that requires a run-time check
|
|
CanThrowResult CT = canDynamicCastThrow(cast<CXXDynamicCastExpr>(E));
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
case Expr::CXXTypeidExprClass:
|
|
// - a potentially evaluated typeid expression applied to a glvalue
|
|
// expression whose type is a polymorphic class type
|
|
return canTypeidThrow(*this, cast<CXXTypeidExpr>(E));
|
|
|
|
// - a potentially evaluated call to a function, member function, function
|
|
// pointer, or member function pointer that does not have a non-throwing
|
|
// exception-specification
|
|
case Expr::CallExprClass:
|
|
case Expr::CXXMemberCallExprClass:
|
|
case Expr::CXXOperatorCallExprClass:
|
|
case Expr::UserDefinedLiteralClass: {
|
|
const CallExpr *CE = cast<CallExpr>(E);
|
|
CanThrowResult CT;
|
|
if (E->isTypeDependent())
|
|
CT = CT_Dependent;
|
|
else if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens()))
|
|
CT = CT_Cannot;
|
|
else
|
|
CT = canCalleeThrow(*this, E, CE->getCalleeDecl());
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
case Expr::CXXConstructExprClass:
|
|
case Expr::CXXTemporaryObjectExprClass: {
|
|
CanThrowResult CT = canCalleeThrow(*this, E,
|
|
cast<CXXConstructExpr>(E)->getConstructor());
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
case Expr::LambdaExprClass: {
|
|
const LambdaExpr *Lambda = cast<LambdaExpr>(E);
|
|
CanThrowResult CT = CT_Cannot;
|
|
for (LambdaExpr::capture_init_iterator Cap = Lambda->capture_init_begin(),
|
|
CapEnd = Lambda->capture_init_end();
|
|
Cap != CapEnd; ++Cap)
|
|
CT = mergeCanThrow(CT, canThrow(*Cap));
|
|
return CT;
|
|
}
|
|
|
|
case Expr::CXXNewExprClass: {
|
|
CanThrowResult CT;
|
|
if (E->isTypeDependent())
|
|
CT = CT_Dependent;
|
|
else
|
|
CT = canCalleeThrow(*this, E, cast<CXXNewExpr>(E)->getOperatorNew());
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
case Expr::CXXDeleteExprClass: {
|
|
CanThrowResult CT;
|
|
QualType DTy = cast<CXXDeleteExpr>(E)->getDestroyedType();
|
|
if (DTy.isNull() || DTy->isDependentType()) {
|
|
CT = CT_Dependent;
|
|
} else {
|
|
CT = canCalleeThrow(*this, E,
|
|
cast<CXXDeleteExpr>(E)->getOperatorDelete());
|
|
if (const RecordType *RT = DTy->getAs<RecordType>()) {
|
|
const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
|
|
CT = mergeCanThrow(CT, canCalleeThrow(*this, E, RD->getDestructor()));
|
|
}
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
}
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
case Expr::CXXBindTemporaryExprClass: {
|
|
// The bound temporary has to be destroyed again, which might throw.
|
|
CanThrowResult CT = canCalleeThrow(*this, E,
|
|
cast<CXXBindTemporaryExpr>(E)->getTemporary()->getDestructor());
|
|
if (CT == CT_Can)
|
|
return CT;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
// ObjC message sends are like function calls, but never have exception
|
|
// specs.
|
|
case Expr::ObjCMessageExprClass:
|
|
case Expr::ObjCPropertyRefExprClass:
|
|
case Expr::ObjCSubscriptRefExprClass:
|
|
return CT_Can;
|
|
|
|
// All the ObjC literals that are implemented as calls are
|
|
// potentially throwing unless we decide to close off that
|
|
// possibility.
|
|
case Expr::ObjCArrayLiteralClass:
|
|
case Expr::ObjCDictionaryLiteralClass:
|
|
case Expr::ObjCBoxedExprClass:
|
|
return CT_Can;
|
|
|
|
// Many other things have subexpressions, so we have to test those.
|
|
// Some are simple:
|
|
case Expr::ConditionalOperatorClass:
|
|
case Expr::CompoundLiteralExprClass:
|
|
case Expr::CXXConstCastExprClass:
|
|
case Expr::CXXReinterpretCastExprClass:
|
|
case Expr::DesignatedInitExprClass:
|
|
case Expr::ExprWithCleanupsClass:
|
|
case Expr::ExtVectorElementExprClass:
|
|
case Expr::InitListExprClass:
|
|
case Expr::MemberExprClass:
|
|
case Expr::ObjCIsaExprClass:
|
|
case Expr::ObjCIvarRefExprClass:
|
|
case Expr::ParenExprClass:
|
|
case Expr::ParenListExprClass:
|
|
case Expr::ShuffleVectorExprClass:
|
|
case Expr::VAArgExprClass:
|
|
return canSubExprsThrow(*this, E);
|
|
|
|
// Some might be dependent for other reasons.
|
|
case Expr::ArraySubscriptExprClass:
|
|
case Expr::BinaryOperatorClass:
|
|
case Expr::CompoundAssignOperatorClass:
|
|
case Expr::CStyleCastExprClass:
|
|
case Expr::CXXStaticCastExprClass:
|
|
case Expr::CXXFunctionalCastExprClass:
|
|
case Expr::ImplicitCastExprClass:
|
|
case Expr::MaterializeTemporaryExprClass:
|
|
case Expr::UnaryOperatorClass: {
|
|
CanThrowResult CT = E->isTypeDependent() ? CT_Dependent : CT_Cannot;
|
|
return mergeCanThrow(CT, canSubExprsThrow(*this, E));
|
|
}
|
|
|
|
// FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms.
|
|
case Expr::StmtExprClass:
|
|
return CT_Can;
|
|
|
|
case Expr::CXXDefaultArgExprClass:
|
|
return canThrow(cast<CXXDefaultArgExpr>(E)->getExpr());
|
|
|
|
case Expr::CXXDefaultInitExprClass:
|
|
return canThrow(cast<CXXDefaultInitExpr>(E)->getExpr());
|
|
|
|
case Expr::ChooseExprClass:
|
|
if (E->isTypeDependent() || E->isValueDependent())
|
|
return CT_Dependent;
|
|
return canThrow(cast<ChooseExpr>(E)->getChosenSubExpr(Context));
|
|
|
|
case Expr::GenericSelectionExprClass:
|
|
if (cast<GenericSelectionExpr>(E)->isResultDependent())
|
|
return CT_Dependent;
|
|
return canThrow(cast<GenericSelectionExpr>(E)->getResultExpr());
|
|
|
|
// Some expressions are always dependent.
|
|
case Expr::CXXDependentScopeMemberExprClass:
|
|
case Expr::CXXUnresolvedConstructExprClass:
|
|
case Expr::DependentScopeDeclRefExprClass:
|
|
return CT_Dependent;
|
|
|
|
case Expr::AsTypeExprClass:
|
|
case Expr::BinaryConditionalOperatorClass:
|
|
case Expr::BlockExprClass:
|
|
case Expr::CUDAKernelCallExprClass:
|
|
case Expr::DeclRefExprClass:
|
|
case Expr::ObjCBridgedCastExprClass:
|
|
case Expr::ObjCIndirectCopyRestoreExprClass:
|
|
case Expr::ObjCProtocolExprClass:
|
|
case Expr::ObjCSelectorExprClass:
|
|
case Expr::OffsetOfExprClass:
|
|
case Expr::PackExpansionExprClass:
|
|
case Expr::PseudoObjectExprClass:
|
|
case Expr::SubstNonTypeTemplateParmExprClass:
|
|
case Expr::SubstNonTypeTemplateParmPackExprClass:
|
|
case Expr::FunctionParmPackExprClass:
|
|
case Expr::UnaryExprOrTypeTraitExprClass:
|
|
case Expr::UnresolvedLookupExprClass:
|
|
case Expr::UnresolvedMemberExprClass:
|
|
// FIXME: Can any of the above throw? If so, when?
|
|
return CT_Cannot;
|
|
|
|
case Expr::AddrLabelExprClass:
|
|
case Expr::ArrayTypeTraitExprClass:
|
|
case Expr::AtomicExprClass:
|
|
case Expr::BinaryTypeTraitExprClass:
|
|
case Expr::TypeTraitExprClass:
|
|
case Expr::CXXBoolLiteralExprClass:
|
|
case Expr::CXXNoexceptExprClass:
|
|
case Expr::CXXNullPtrLiteralExprClass:
|
|
case Expr::CXXPseudoDestructorExprClass:
|
|
case Expr::CXXScalarValueInitExprClass:
|
|
case Expr::CXXThisExprClass:
|
|
case Expr::CXXUuidofExprClass:
|
|
case Expr::CharacterLiteralClass:
|
|
case Expr::ExpressionTraitExprClass:
|
|
case Expr::FloatingLiteralClass:
|
|
case Expr::GNUNullExprClass:
|
|
case Expr::ImaginaryLiteralClass:
|
|
case Expr::ImplicitValueInitExprClass:
|
|
case Expr::IntegerLiteralClass:
|
|
case Expr::ObjCEncodeExprClass:
|
|
case Expr::ObjCStringLiteralClass:
|
|
case Expr::ObjCBoolLiteralExprClass:
|
|
case Expr::OpaqueValueExprClass:
|
|
case Expr::PredefinedExprClass:
|
|
case Expr::SizeOfPackExprClass:
|
|
case Expr::StringLiteralClass:
|
|
case Expr::UnaryTypeTraitExprClass:
|
|
// These expressions can never throw.
|
|
return CT_Cannot;
|
|
|
|
case Expr::MSPropertyRefExprClass:
|
|
llvm_unreachable("Invalid class for expression");
|
|
|
|
#define STMT(CLASS, PARENT) case Expr::CLASS##Class:
|
|
#define STMT_RANGE(Base, First, Last)
|
|
#define LAST_STMT_RANGE(BASE, FIRST, LAST)
|
|
#define EXPR(CLASS, PARENT)
|
|
#define ABSTRACT_STMT(STMT)
|
|
#include "clang/AST/StmtNodes.inc"
|
|
case Expr::NoStmtClass:
|
|
llvm_unreachable("Invalid class for expression");
|
|
}
|
|
llvm_unreachable("Bogus StmtClass");
|
|
}
|
|
|
|
} // end namespace clang
|