summaryrefslogtreecommitdiffstats
path: root/lib/Sema/SemaExceptionSpec.cpp
diff options
context:
space:
mode:
authorrdivacky <rdivacky@FreeBSD.org>2009-10-14 18:03:49 +0000
committerrdivacky <rdivacky@FreeBSD.org>2009-10-14 18:03:49 +0000
commit9092c3e0fa01f3139b016d05d267a89e3b07747a (patch)
tree137ebebcae16fb0ce7ab4af456992bbd8d22fced /lib/Sema/SemaExceptionSpec.cpp
parent4981926bf654fe5a2c3893f24ca44106b217e71e (diff)
downloadFreeBSD-src-9092c3e0fa01f3139b016d05d267a89e3b07747a.zip
FreeBSD-src-9092c3e0fa01f3139b016d05d267a89e3b07747a.tar.gz
Update clang to r84119.
Diffstat (limited to 'lib/Sema/SemaExceptionSpec.cpp')
-rw-r--r--lib/Sema/SemaExceptionSpec.cpp320
1 files changed, 320 insertions, 0 deletions
diff --git a/lib/Sema/SemaExceptionSpec.cpp b/lib/Sema/SemaExceptionSpec.cpp
new file mode 100644
index 0000000..bdd00b8
--- /dev/null
+++ b/lib/Sema/SemaExceptionSpec.cpp
@@ -0,0 +1,320 @@
+//===--- 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 "Sema.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/AST/CXXInheritance.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.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) {
+ // FIXME: This may not correctly work with the fix for core issue 437,
+ // where a class's own type is considered complete within its body. But
+ // perhaps RequireCompleteType itself should contain this logic?
+
+ // 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;
+
+ if (!T->isVoidType() && RequireCompleteType(Range.getBegin(), T,
+ PDiag(diag::err_incomplete_in_exception_spec) << /*direct*/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();
+}
+
+/// 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) {
+ return CheckEquivalentExceptionSpec(diag::err_mismatched_exception_spec,
+ diag::note_previous_declaration,
+ Old, OldLoc, New, NewLoc);
+}
+
+/// 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 PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
+ const FunctionProtoType *Old, SourceLocation OldLoc,
+ const FunctionProtoType *New, SourceLocation NewLoc) {
+ bool OldAny = !Old->hasExceptionSpec() || Old->hasAnyExceptionSpec();
+ bool NewAny = !New->hasExceptionSpec() || New->hasAnyExceptionSpec();
+ if (OldAny && NewAny)
+ return false;
+ if (OldAny || NewAny) {
+ Diag(NewLoc, DiagID);
+ if (NoteID.getDiagID() != 0)
+ Diag(OldLoc, NoteID);
+ return true;
+ }
+
+ bool Success = true;
+ // Both have a definite 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) {
+ // 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;
+
+ // If superset contains everything, we're done.
+ if (!Superset->hasExceptionSpec() || Superset->hasAnyExceptionSpec())
+ return CheckParamExceptionSpec(NoteID, Superset, SuperLoc, Subset, SubLoc);
+
+ // It does not. If the subset contains everything, we've failed.
+ if (!Subset->hasExceptionSpec() || Subset->hasAnyExceptionSpec()) {
+ Diag(SubLoc, DiagID);
+ if (NoteID.getDiagID() != 0)
+ Diag(SuperLoc, NoteID);
+ return true;
+ }
+
+ // Neither contains everything. 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.getUnqualifiedType();
+
+ 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.getUnqualifiedType();
+ // 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(CanonicalSuperT))
+ continue;
+
+ if (FindInaccessibleBase(CanonicalSubT, CanonicalSuperT, Paths, true))
+ continue;
+
+ 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, 0,
+ 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, 0,
+ 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(diag::err_incompatible_exception_specs,
+ 0, ToFunc, From->getSourceRange().getBegin(),
+ FromFunc, SourceLocation());
+}
+
+bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New,
+ const CXXMethodDecl *Old) {
+ return CheckExceptionSpecSubset(diag::err_override_exception_spec,
+ diag::note_overridden_virtual_function,
+ Old->getType()->getAs<FunctionProtoType>(),
+ Old->getLocation(),
+ New->getType()->getAs<FunctionProtoType>(),
+ New->getLocation());
+}
+
+} // end namespace clang
OpenPOWER on IntegriCloud