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llvm-project/clang/lib/Sema/SemaExceptionSpec.cpp

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//===--- SemaExceptionSpec.cpp - C++ Exception Specifications ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides Sema routines for C++ exception specification testing.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/SmallPtrSet.h"
namespace clang {
static const FunctionProtoType *GetUnderlyingFunction(QualType T)
{
if (const PointerType *PtrTy = T->getAs<PointerType>())
T = PtrTy->getPointeeType();
else if (const ReferenceType *RefTy = T->getAs<ReferenceType>())
T = RefTy->getPointeeType();
else if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
T = MPTy->getPointeeType();
return T->getAs<FunctionProtoType>();
}
/// CheckSpecifiedExceptionType - Check if the given type is valid in an
/// exception specification. Incomplete types, or pointers to incomplete types
/// other than void are not allowed.
bool Sema::CheckSpecifiedExceptionType(QualType T, const SourceRange &Range) {
// This check (and the similar one below) deals with issue 437, that changes
// C++ 9.2p2 this way:
// Within the class member-specification, the class is regarded as complete
// within function bodies, default arguments, exception-specifications, and
// constructor ctor-initializers (including such things in nested classes).
if (T->isRecordType() && T->getAs<RecordType>()->isBeingDefined())
return false;
// C++ 15.4p2: A type denoted in an exception-specification shall not denote
// an incomplete type.
if (RequireCompleteType(Range.getBegin(), T,
PDiag(diag::err_incomplete_in_exception_spec) << /*direct*/0 << Range))
return true;
// C++ 15.4p2: A type denoted in an exception-specification shall not denote
// an incomplete type a pointer or reference to an incomplete type, other
// than (cv) void*.
int kind;
if (const PointerType* IT = T->getAs<PointerType>()) {
T = IT->getPointeeType();
kind = 1;
} else if (const ReferenceType* IT = T->getAs<ReferenceType>()) {
T = IT->getPointeeType();
kind = 2;
} else
return false;
// Again as before
if (T->isRecordType() && T->getAs<RecordType>()->isBeingDefined())
return false;
if (!T->isVoidType() && RequireCompleteType(Range.getBegin(), T,
PDiag(diag::err_incomplete_in_exception_spec) << kind << Range))
return true;
return false;
}
/// CheckDistantExceptionSpec - Check if the given type is a pointer or pointer
/// to member to a function with an exception specification. This means that
/// it is invalid to add another level of indirection.
bool Sema::CheckDistantExceptionSpec(QualType T) {
if (const PointerType *PT = T->getAs<PointerType>())
T = PT->getPointeeType();
else if (const MemberPointerType *PT = T->getAs<MemberPointerType>())
T = PT->getPointeeType();
else
return false;
const FunctionProtoType *FnT = T->getAs<FunctionProtoType>();
if (!FnT)
return false;
return FnT->hasExceptionSpec();
}
bool Sema::CheckEquivalentExceptionSpec(FunctionDecl *Old, FunctionDecl *New) {
OverloadedOperatorKind OO = New->getDeclName().getCXXOverloadedOperator();
bool IsOperatorNew = OO == OO_New || OO == OO_Array_New;
bool MissingExceptionSpecification = false;
bool MissingEmptyExceptionSpecification = false;
unsigned DiagID = diag::err_mismatched_exception_spec;
if (getLangOptions().Microsoft)
DiagID = diag::warn_mismatched_exception_spec;
if (!CheckEquivalentExceptionSpec(PDiag(DiagID),
PDiag(diag::note_previous_declaration),
Old->getType()->getAs<FunctionProtoType>(),
Old->getLocation(),
New->getType()->getAs<FunctionProtoType>(),
New->getLocation(),
&MissingExceptionSpecification,
&MissingEmptyExceptionSpecification,
/*AllowNoexceptAllMatchWithNoSpec=*/true,
IsOperatorNew))
return false;
// The failure was something other than an empty exception
// specification; return an error.
if (!MissingExceptionSpecification && !MissingEmptyExceptionSpecification)
return true;
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
// The new function declaration is only missing an empty exception
// specification "throw()". If the throw() specification came from a
// function in a system header that has C linkage, just add an empty
// exception specification to the "new" declaration. This is an
// egregious workaround for glibc, which adds throw() specifications
// to many libc functions as an optimization. Unfortunately, that
// optimization isn't permitted by the C++ standard, so we're forced
// to work around it here.
if (MissingEmptyExceptionSpecification && NewProto &&
(Old->getLocation().isInvalid() ||
Context.getSourceManager().isInSystemHeader(Old->getLocation())) &&
Old->isExternC()) {
FunctionProtoType::ExtProtoInfo EPI = NewProto->getExtProtoInfo();
EPI.ExceptionSpecType = EST_DynamicNone;
QualType NewType = Context.getFunctionType(NewProto->getResultType(),
NewProto->arg_type_begin(),
NewProto->getNumArgs(),
EPI);
New->setType(NewType);
return false;
}
if (MissingExceptionSpecification && NewProto) {
const FunctionProtoType *OldProto
= Old->getType()->getAs<FunctionProtoType>();
FunctionProtoType::ExtProtoInfo EPI = NewProto->getExtProtoInfo();
EPI.ExceptionSpecType = OldProto->getExceptionSpecType();
if (EPI.ExceptionSpecType == EST_Dynamic) {
EPI.NumExceptions = OldProto->getNumExceptions();
EPI.Exceptions = OldProto->exception_begin();
} else if (EPI.ExceptionSpecType == EST_ComputedNoexcept) {
// FIXME: We can't just take the expression from the old prototype. It
// likely contains references to the old prototype's parameters.
}
// Update the type of the function with the appropriate exception
// specification.
QualType NewType = Context.getFunctionType(NewProto->getResultType(),
NewProto->arg_type_begin(),
NewProto->getNumArgs(),
EPI);
New->setType(NewType);
// If exceptions are disabled, suppress the warning about missing
// exception specifications for new and delete operators.
if (!getLangOptions().CXXExceptions) {
switch (New->getDeclName().getCXXOverloadedOperator()) {
case OO_New:
case OO_Array_New:
case OO_Delete:
case OO_Array_Delete:
if (New->getDeclContext()->isTranslationUnit())
return false;
break;
default:
break;
}
}
// Warn about the lack of exception specification.
llvm::SmallString<128> ExceptionSpecString;
llvm::raw_svector_ostream OS(ExceptionSpecString);
switch (OldProto->getExceptionSpecType()) {
case EST_DynamicNone:
OS << "throw()";
break;
case EST_Dynamic: {
OS << "throw(";
bool OnFirstException = true;
for (FunctionProtoType::exception_iterator E = OldProto->exception_begin(),
EEnd = OldProto->exception_end();
E != EEnd;
++E) {
if (OnFirstException)
OnFirstException = false;
else
OS << ", ";
OS << E->getAsString(Context.PrintingPolicy);
}
OS << ")";
break;
}
case EST_BasicNoexcept:
OS << "noexcept";
break;
case EST_ComputedNoexcept:
OS << "noexcept(";
OldProto->getNoexceptExpr()->printPretty(OS, Context, 0,
Context.PrintingPolicy);
OS << ")";
break;
default:
assert(false && "This spec type is compatible with none.");
}
OS.flush();
SourceLocation FixItLoc;
if (TypeSourceInfo *TSInfo = New->getTypeSourceInfo()) {
TypeLoc TL = TSInfo->getTypeLoc().IgnoreParens();
if (const FunctionTypeLoc *FTLoc = dyn_cast<FunctionTypeLoc>(&TL))
FixItLoc = PP.getLocForEndOfToken(FTLoc->getLocalRangeEnd());
}
if (FixItLoc.isInvalid())
Diag(New->getLocation(), diag::warn_missing_exception_specification)
<< New << OS.str();
else {
// FIXME: This will get more complicated with C++0x
// late-specified return types.
Diag(New->getLocation(), diag::warn_missing_exception_specification)
<< New << OS.str()
<< FixItHint::CreateInsertion(FixItLoc, " " + OS.str().str());
}
if (!Old->getLocation().isInvalid())
Diag(Old->getLocation(), diag::note_previous_declaration);
return false;
}
Diag(New->getLocation(), DiagID);
Diag(Old->getLocation(), diag::note_previous_declaration);
return true;
}
/// CheckEquivalentExceptionSpec - Check if the two types have equivalent
/// exception specifications. Exception specifications are equivalent if
/// they allow exactly the same set of exception types. It does not matter how
/// that is achieved. See C++ [except.spec]p2.
bool Sema::CheckEquivalentExceptionSpec(
const FunctionProtoType *Old, SourceLocation OldLoc,
const FunctionProtoType *New, SourceLocation NewLoc) {
unsigned DiagID = diag::err_mismatched_exception_spec;
if (getLangOptions().Microsoft)
DiagID = diag::warn_mismatched_exception_spec;
return CheckEquivalentExceptionSpec(
PDiag(DiagID),
PDiag(diag::note_previous_declaration),
Old, OldLoc, New, NewLoc);
}
/// CheckEquivalentExceptionSpec - Check if the two types have compatible
/// exception specifications. See C++ [except.spec]p3.
bool Sema::CheckEquivalentExceptionSpec(const PartialDiagnostic &DiagID,
const PartialDiagnostic & NoteID,
const FunctionProtoType *Old,
SourceLocation OldLoc,
const FunctionProtoType *New,
SourceLocation NewLoc,
bool *MissingExceptionSpecification,
bool*MissingEmptyExceptionSpecification,
bool AllowNoexceptAllMatchWithNoSpec,
bool IsOperatorNew) {
// Just completely ignore this under -fno-exceptions.
if (!getLangOptions().CXXExceptions)
return false;
if (MissingExceptionSpecification)
*MissingExceptionSpecification = false;
if (MissingEmptyExceptionSpecification)
*MissingEmptyExceptionSpecification = false;
// C++0x [except.spec]p3: Two exception-specifications are compatible if:
// - both are non-throwing, regardless of their form,
// - both have the form noexcept(constant-expression) and the constant-
// expressions are equivalent,
// - one exception-specification is a noexcept-specification allowing all
// exceptions and the other is of the form throw(type-id-list), or
// - both are dynamic-exception-specifications that have the same set of
// adjusted types.
//
// C++0x [except.spec]p12: An exception-specifcation is non-throwing if it is
// of the form throw(), noexcept, or noexcept(constant-expression) where the
// constant-expression yields true.
//
// CWG 1073 Proposed resolution: Strike the third bullet above.
//
// C++0x [except.spec]p4: If any declaration of a function has an exception-
// specifier that is not a noexcept-specification allowing all exceptions,
// all declarations [...] of that function shall have a compatible
// exception-specification.
//
// That last point basically means that noexcept(false) matches no spec.
// It's considered when AllowNoexceptAllMatchWithNoSpec is true.
ExceptionSpecificationType OldEST = Old->getExceptionSpecType();
ExceptionSpecificationType NewEST = New->getExceptionSpecType();
// Shortcut the case where both have no spec.
if (OldEST == EST_None && NewEST == EST_None)
return false;
FunctionProtoType::NoexceptResult OldNR = Old->getNoexceptSpec(Context);
FunctionProtoType::NoexceptResult NewNR = New->getNoexceptSpec(Context);
if (OldNR == FunctionProtoType::NR_BadNoexcept ||
NewNR == FunctionProtoType::NR_BadNoexcept)
return false;
// Dependent noexcept specifiers are compatible with each other, but nothing
// else.
// One noexcept is compatible with another if the argument is the same
if (OldNR == NewNR &&
OldNR != FunctionProtoType::NR_NoNoexcept &&
NewNR != FunctionProtoType::NR_NoNoexcept)
return false;
if (OldNR != NewNR &&
OldNR != FunctionProtoType::NR_NoNoexcept &&
NewNR != FunctionProtoType::NR_NoNoexcept) {
Diag(NewLoc, DiagID);
if (NoteID.getDiagID() != 0)
Diag(OldLoc, NoteID);
return true;
}
// The MS extension throw(...) is compatible with itself.
if (OldEST == EST_MSAny && NewEST == EST_MSAny)
return false;
// It's also compatible with no spec.
if ((OldEST == EST_None && NewEST == EST_MSAny) ||
(OldEST == EST_MSAny && NewEST == EST_None))
return false;
// It's also compatible with noexcept(false).
if (OldEST == EST_MSAny && NewNR == FunctionProtoType::NR_Throw)
return false;
if (NewEST == EST_MSAny && OldNR == FunctionProtoType::NR_Throw)
return false;
// As described above, noexcept(false) matches no spec only for functions.
if (AllowNoexceptAllMatchWithNoSpec) {
if (OldEST == EST_None && NewNR == FunctionProtoType::NR_Throw)
return false;
if (NewEST == EST_None && OldNR == FunctionProtoType::NR_Throw)
return false;
}
// Any non-throwing specifications are compatible.
bool OldNonThrowing = OldNR == FunctionProtoType::NR_Nothrow ||
OldEST == EST_DynamicNone;
bool NewNonThrowing = NewNR == FunctionProtoType::NR_Nothrow ||
NewEST == EST_DynamicNone;
if (OldNonThrowing && NewNonThrowing)
return false;
// As a special compatibility feature, under C++0x we accept no spec and
// throw(std::bad_alloc) as equivalent for operator new and operator new[].
// This is because the implicit declaration changed, but old code would break.
if (getLangOptions().CPlusPlus0x && IsOperatorNew) {
const FunctionProtoType *WithExceptions = 0;
if (OldEST == EST_None && NewEST == EST_Dynamic)
WithExceptions = New;
else if (OldEST == EST_Dynamic && NewEST == EST_None)
WithExceptions = Old;
if (WithExceptions && WithExceptions->getNumExceptions() == 1) {
// One has no spec, the other throw(something). If that something is
// std::bad_alloc, all conditions are met.
QualType Exception = *WithExceptions->exception_begin();
if (CXXRecordDecl *ExRecord = Exception->getAsCXXRecordDecl()) {
IdentifierInfo* Name = ExRecord->getIdentifier();
if (Name && Name->getName() == "bad_alloc") {
// It's called bad_alloc, but is it in std?
DeclContext* DC = ExRecord->getDeclContext();
DC = DC->getEnclosingNamespaceContext();
if (NamespaceDecl* NS = dyn_cast<NamespaceDecl>(DC)) {
IdentifierInfo* NSName = NS->getIdentifier();
DC = DC->getParent();
if (NSName && NSName->getName() == "std" &&
DC->getEnclosingNamespaceContext()->isTranslationUnit()) {
return false;
}
}
}
}
}
}
// 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 (!getLangOptions().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;
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();
// 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");
break;
case AR_delayed:
llvm_unreachable("access check delayed in non-declaration");
break;
}
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) {
return CheckExceptionSpecSubset(PDiag(diag::err_override_exception_spec),
PDiag(diag::note_overridden_virtual_function),
Old->getType()->getAs<FunctionProtoType>(),
Old->getLocation(),
New->getType()->getAs<FunctionProtoType>(),
New->getLocation());
}
} // end namespace clang
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