/// evaluate the expression regardless of what the RHS is, but C only allows
/// certain things in certain situations.
namespace {
+ struct LValue;
struct CallStackFrame;
struct EvalInfo;
+ /// Get an LValue path entry, which is known to not be an array index, as a
+ /// field declaration.
+ const FieldDecl *getAsField(APValue::LValuePathEntry E) {
+ APValue::BaseOrMemberType Value;
+ Value.setFromOpaqueValue(E.BaseOrMember);
+ return dyn_cast<FieldDecl>(Value.getPointer());
+ }
+ /// Get an LValue path entry, which is known to not be an array index, as a
+ /// base class declaration.
+ const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) {
+ APValue::BaseOrMemberType Value;
+ Value.setFromOpaqueValue(E.BaseOrMember);
+ return dyn_cast<CXXRecordDecl>(Value.getPointer());
+ }
+ /// Determine whether this LValue path entry for a base class names a virtual
+ /// base class.
+ bool isVirtualBaseClass(APValue::LValuePathEntry E) {
+ APValue::BaseOrMemberType Value;
+ Value.setFromOpaqueValue(E.BaseOrMember);
+ return Value.getInt();
+ }
+
/// Determine whether the described subobject is an array element.
static bool SubobjectIsArrayElement(QualType Base,
ArrayRef<APValue::LValuePathEntry> Path) {
IsArrayElement = T && T->isArrayType();
if (IsArrayElement)
T = T->getBaseElementTypeUnsafe();
- else if (const FieldDecl *FD = dyn_cast<FieldDecl>(Path[I].BaseOrMember))
+ else if (const FieldDecl *FD = getAsField(Path[I]))
T = FD->getType().getTypePtr();
else
// Path[I] describes a base class.
}
/// Update this designator to refer to the given base or member of this
/// object.
- void addDecl(const Decl *D) {
+ void addDecl(const Decl *D, bool Virtual = false) {
if (Invalid) return;
if (OnePastTheEnd) {
setInvalid();
return;
}
PathEntry Entry;
- Entry.BaseOrMember = D;
+ APValue::BaseOrMemberType Value(D, Virtual);
+ Entry.BaseOrMember = Value.getOpaqueValue();
Entries.push_back(Entry);
ArrayElement = false;
}
/// Parent - The caller of this stack frame.
CallStackFrame *Caller;
+ /// This - The binding for the this pointer in this call, if any.
+ const LValue *This;
+
/// ParmBindings - Parameter bindings for this function call, indexed by
/// parameters' function scope indices.
const CCValue *Arguments;
/// Temporaries - Temporary lvalues materialized within this stack frame.
MapTy Temporaries;
- CallStackFrame(EvalInfo &Info, const CCValue *Arguments);
+ CallStackFrame(EvalInfo &Info, const LValue *This,
+ const CCValue *Arguments);
~CallStackFrame();
};
/// initialized last.
CallStackFrame BottomFrame;
+ /// EvaluatingDecl - This is the declaration whose initializer is being
+ /// evaluated, if any.
+ const VarDecl *EvaluatingDecl;
+
+ /// EvaluatingDeclValue - This is the value being constructed for the
+ /// declaration whose initializer is being evaluated, if any.
+ APValue *EvaluatingDeclValue;
+
EvalInfo(const ASTContext &C, Expr::EvalStatus &S)
: Ctx(C), EvalStatus(S), CurrentCall(0), NumCalls(0), CallStackDepth(0),
- BottomFrame(*this, 0) {}
+ BottomFrame(*this, 0, 0), EvaluatingDecl(0), EvaluatingDeclValue(0) {}
const CCValue *getOpaqueValue(const OpaqueValueExpr *e) const {
MapTy::const_iterator i = OpaqueValues.find(e);
return &i->second;
}
+ void setEvaluatingDecl(const VarDecl *VD, APValue &Value) {
+ EvaluatingDecl = VD;
+ EvaluatingDeclValue = &Value;
+ }
+
const LangOptions &getLangOpts() { return Ctx.getLangOptions(); }
};
- CallStackFrame::CallStackFrame(EvalInfo &Info, const CCValue *Arguments)
- : Info(Info), Caller(Info.CurrentCall), Arguments(Arguments) {
+ CallStackFrame::CallStackFrame(EvalInfo &Info, const LValue *This,
+ const CCValue *Arguments)
+ : Info(Info), Caller(Info.CurrentCall), This(This), Arguments(Arguments) {
Info.CurrentCall = this;
++Info.CallStackDepth;
}
static bool Evaluate(CCValue &Result, EvalInfo &Info, const Expr *E);
static bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info,
- const Expr *E);
+ const LValue &This, const Expr *E);
static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info);
static bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info);
static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info);
// Misc utilities
//===----------------------------------------------------------------------===//
+/// Should this call expression be treated as a string literal?
+static bool IsStringLiteralCall(const CallExpr *E) {
+ unsigned Builtin = E->isBuiltinCall();
+ return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString ||
+ Builtin == Builtin::BI__builtin___NSStringMakeConstantString);
+}
+
static bool IsGlobalLValue(const Expr* E) {
+ // C++11 [expr.const]p3 An address constant expression is a prvalue core
+ // constant expression of pointer type that evaluates to...
+
+ // ... a null pointer value, or a prvalue core constant expression of type
+ // std::nullptr_t.
if (!E) return true;
- if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
- if (isa<FunctionDecl>(DRE->getDecl()))
- return true;
+ switch (E->getStmtClass()) {
+ default:
+ return false;
+ case Expr::DeclRefExprClass: {
+ const DeclRefExpr *DRE = cast<DeclRefExpr>(E);
+ // ... the address of an object with static storage duration,
if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl()))
return VD->hasGlobalStorage();
+ // ... to the address of a function,
+ if (isa<FunctionDecl>(DRE->getDecl()))
+ return true;
return false;
}
-
- if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(E))
- return CLE->isFileScope();
-
- if (isa<MemberExpr>(E) || isa<MaterializeTemporaryExpr>(E))
- return false;
-
- return true;
+ case Expr::CompoundLiteralExprClass:
+ return cast<CompoundLiteralExpr>(E)->isFileScope();
+ // A string literal has static storage duration.
+ case Expr::StringLiteralClass:
+ case Expr::PredefinedExprClass:
+ case Expr::ObjCStringLiteralClass:
+ case Expr::ObjCEncodeExprClass:
+ return true;
+ case Expr::CallExprClass:
+ return IsStringLiteralCall(cast<CallExpr>(E));
+ // For GCC compatibility, &&label has static storage duration.
+ case Expr::AddrLabelExprClass:
+ return true;
+ // A Block literal expression may be used as the initialization value for
+ // Block variables at global or local static scope.
+ case Expr::BlockExprClass:
+ return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures();
+ }
}
/// Check that this reference or pointer core constant expression is a valid
return true;
}
+ // FIXME: Null references are not constant expressions.
+
Value = APValue(LVal.getLValueBase(), LVal.getLValueOffset(),
Designator.Entries);
return true;
}
case APValue::Vector:
case APValue::Array:
+ case APValue::Struct:
+ case APValue::Union:
return false;
}
return Result;
}
+/// If the given LValue refers to a base subobject of some object, find the most
+/// derived object and the corresponding complete record type. This is necessary
+/// in order to find the offset of a virtual base class.
+static bool ExtractMostDerivedObject(EvalInfo &Info, LValue &Result,
+ const CXXRecordDecl *&MostDerivedType) {
+ SubobjectDesignator &D = Result.Designator;
+ if (D.Invalid || !Result.Base)
+ return false;
+
+ const Type *T = Result.Base->getType().getTypePtr();
+
+ // Find path prefix which leads to the most-derived subobject.
+ unsigned MostDerivedPathLength = 0;
+ MostDerivedType = T->getAsCXXRecordDecl();
+ bool MostDerivedIsArrayElement = false;
+
+ for (unsigned I = 0, N = D.Entries.size(); I != N; ++I) {
+ bool IsArray = T && T->isArrayType();
+ if (IsArray)
+ T = T->getBaseElementTypeUnsafe();
+ else if (const FieldDecl *FD = getAsField(D.Entries[I]))
+ T = FD->getType().getTypePtr();
+ else
+ T = 0;
+
+ if (T) {
+ MostDerivedType = T->getAsCXXRecordDecl();
+ MostDerivedPathLength = I + 1;
+ MostDerivedIsArrayElement = IsArray;
+ }
+ }
+
+ if (!MostDerivedType)
+ return false;
+
+ // (B*)&d + 1 has no most-derived object.
+ if (D.OnePastTheEnd && MostDerivedPathLength != D.Entries.size())
+ return false;
+
+ // Remove the trailing base class path entries and their offsets.
+ const RecordDecl *RD = MostDerivedType;
+ for (unsigned I = MostDerivedPathLength, N = D.Entries.size(); I != N; ++I) {
+ const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);
+ const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]);
+ if (isVirtualBaseClass(D.Entries[I])) {
+ assert(I == MostDerivedPathLength &&
+ "virtual base class must be immediately after most-derived class");
+ Result.Offset -= Layout.getVBaseClassOffset(Base);
+ } else
+ Result.Offset -= Layout.getBaseClassOffset(Base);
+ RD = Base;
+ }
+ D.Entries.resize(MostDerivedPathLength);
+ D.ArrayElement = MostDerivedIsArrayElement;
+ return true;
+}
+
+static void HandleLValueDirectBase(EvalInfo &Info, LValue &Obj,
+ const CXXRecordDecl *Derived,
+ const CXXRecordDecl *Base,
+ const ASTRecordLayout *RL = 0) {
+ if (!RL) RL = &Info.Ctx.getASTRecordLayout(Derived);
+ Obj.getLValueOffset() += RL->getBaseClassOffset(Base);
+ Obj.Designator.addDecl(Base, /*Virtual*/ false);
+}
+
+static bool HandleLValueBase(EvalInfo &Info, LValue &Obj,
+ const CXXRecordDecl *DerivedDecl,
+ const CXXBaseSpecifier *Base) {
+ const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();
+
+ if (!Base->isVirtual()) {
+ HandleLValueDirectBase(Info, Obj, DerivedDecl, BaseDecl);
+ return true;
+ }
+
+ // Extract most-derived object and corresponding type.
+ if (!ExtractMostDerivedObject(Info, Obj, DerivedDecl))
+ return false;
+
+ const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl);
+ Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl);
+ Obj.Designator.addDecl(BaseDecl, /*Virtual*/ true);
+ return true;
+}
+
+/// Update LVal to refer to the given field, which must be a member of the type
+/// currently described by LVal.
+static void HandleLValueMember(EvalInfo &Info, LValue &LVal,
+ const FieldDecl *FD,
+ const ASTRecordLayout *RL = 0) {
+ if (!RL)
+ RL = &Info.Ctx.getASTRecordLayout(FD->getParent());
+
+ unsigned I = FD->getFieldIndex();
+ LVal.Offset += Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I));
+ LVal.Designator.addDecl(FD);
+}
+
+/// Get the size of the given type in char units.
+static bool HandleSizeof(EvalInfo &Info, QualType Type, CharUnits &Size) {
+ // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc
+ // extension.
+ if (Type->isVoidType() || Type->isFunctionType()) {
+ Size = CharUnits::One();
+ return true;
+ }
+
+ if (!Type->isConstantSizeType()) {
+ // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2.
+ return false;
+ }
+
+ Size = Info.Ctx.getTypeSizeInChars(Type);
+ return true;
+}
+
+/// Update a pointer value to model pointer arithmetic.
+/// \param Info - Information about the ongoing evaluation.
+/// \param LVal - The pointer value to be updated.
+/// \param EltTy - The pointee type represented by LVal.
+/// \param Adjustment - The adjustment, in objects of type EltTy, to add.
+static bool HandleLValueArrayAdjustment(EvalInfo &Info, LValue &LVal,
+ QualType EltTy, int64_t Adjustment) {
+ CharUnits SizeOfPointee;
+ if (!HandleSizeof(Info, EltTy, SizeOfPointee))
+ return false;
+
+ // Compute the new offset in the appropriate width.
+ LVal.Offset += Adjustment * SizeOfPointee;
+ LVal.Designator.adjustIndex(Adjustment);
+ return true;
+}
+
/// Try to evaluate the initializer for a variable declaration.
-static bool EvaluateVarDeclInit(EvalInfo &Info, const VarDecl *VD,
+static bool EvaluateVarDeclInit(EvalInfo &Info, const Expr *E,const VarDecl *VD,
CallStackFrame *Frame, CCValue &Result) {
// If this is a parameter to an active constexpr function call, perform
// argument substitution.
return true;
}
+ // If we're currently evaluating the initializer of this declaration, use that
+ // in-flight value.
+ if (Info.EvaluatingDecl == VD) {
+ Result = CCValue(*Info.EvaluatingDeclValue, CCValue::GlobalValue());
+ return !Result.isUninit();
+ }
+
// Never evaluate the initializer of a weak variable. We can't be sure that
// this is the definition which will be used.
if (IsWeakDecl(VD))
Expr::EvalStatus EStatus;
EvalInfo InitInfo(Info.Ctx, EStatus);
+ APValue EvalResult;
+ InitInfo.setEvaluatingDecl(VD, EvalResult);
+ LValue LVal;
+ LVal.setExpr(E);
// FIXME: The caller will need to know whether the value was a constant
// expression. If not, we should propagate up a diagnostic.
- APValue EvalResult;
- if (!EvaluateConstantExpression(EvalResult, InitInfo, Init)) {
+ if (!EvaluateConstantExpression(EvalResult, InitInfo, LVal, Init)) {
// FIXME: If the evaluation failure was not permanent (for instance, if we
// hit a variable with no declaration yet, or a constexpr function with no
// definition yet), the standard is unclear as to how we should behave.
assert(!Obj.isLValue() && "extracting subobject of lvalue");
const APValue *O = &Obj;
+ // Walk the designator's path to find the subobject.
for (unsigned I = 0, N = Sub.Entries.size(); I != N; ++I) {
- if (O->isUninit())
- return false;
if (ObjType->isArrayType()) {
+ // Next subobject is an array element.
const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType);
if (!CAT)
return false;
else
O = &O->getArrayFiller();
ObjType = CAT->getElementType();
+ } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) {
+ // Next subobject is a class, struct or union field.
+ RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl();
+ if (RD->isUnion()) {
+ const FieldDecl *UnionField = O->getUnionField();
+ if (!UnionField ||
+ UnionField->getCanonicalDecl() != Field->getCanonicalDecl())
+ return false;
+ O = &O->getUnionValue();
+ } else
+ O = &O->getStructField(Field->getFieldIndex());
+ ObjType = Field->getType();
} else {
- // FIXME: Support handling of subobjects of structs and unions. Also
- // for vector elements, if we want to support those?
+ // Next subobject is a base class.
+ const CXXRecordDecl *RD =
+ cast<CXXRecordDecl>(ObjType->castAs<RecordType>()->getDecl());
+ const CXXRecordDecl *Base =
+ getAsBaseClass(Sub.Entries[I])->getCanonicalDecl();
+ unsigned Index = 0;
+ for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
+ E = RD->bases_end(); I != E; ++I, ++Index) {
+ QualType BT = I->getType();
+ if (BT->castAs<RecordType>()->getDecl()->getCanonicalDecl() == Base) {
+ O = &O->getStructBase(Index);
+ ObjType = BT;
+ break;
+ }
+ }
+ if (Index == RD->getNumBases())
+ return false;
}
+
+ if (O->isUninit())
+ return false;
}
assert(Info.Ctx.hasSameUnqualifiedType(ObjType, SubType) &&
return true;
}
+/// HandleLValueToRValueConversion - Perform an lvalue-to-rvalue conversion on
+/// the given lvalue. This can also be used for 'lvalue-to-lvalue' conversions
+/// for looking up the glvalue referred to by an entity of reference type.
+///
+/// \param Info - Information about the ongoing evaluation.
+/// \param Type - The type we expect this conversion to produce.
+/// \param LVal - The glvalue on which we are attempting to perform this action.
+/// \param RVal - The produced value will be placed here.
static bool HandleLValueToRValueConversion(EvalInfo &Info, QualType Type,
const LValue &LVal, CCValue &RVal) {
const Expr *Base = LVal.Base;
!VD->isConstexpr())
return false;
}
- if (!EvaluateVarDeclInit(Info, VD, Frame, RVal))
+ if (!EvaluateVarDeclInit(Info, LVal.Base, VD, Frame, RVal))
return false;
if (isa<ParmVarDecl>(VD) || !VD->getAnyInitializer()->isLValue())
}
}
+namespace {
+typedef SmallVector<CCValue, 16> ArgVector;
+}
+
+/// EvaluateArgs - Evaluate the arguments to a function call.
+static bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues,
+ EvalInfo &Info) {
+ for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end();
+ I != E; ++I)
+ if (!Evaluate(ArgValues[I - Args.begin()], Info, *I))
+ return false;
+ return true;
+}
+
/// Evaluate a function call.
static bool HandleFunctionCall(ArrayRef<const Expr*> Args, const Stmt *Body,
EvalInfo &Info, CCValue &Result) {
if (Info.NumCalls >= 1000000 || Info.CallStackDepth >= 512)
return false;
- SmallVector<CCValue, 16> ArgValues(Args.size());
- // FIXME: Deal with default arguments and 'this'.
- for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end();
- I != E; ++I)
- if (!Evaluate(ArgValues[I - Args.begin()], Info, *I))
- return false;
+ ArgVector ArgValues(Args.size());
+ if (!EvaluateArgs(Args, ArgValues, Info))
+ return false;
- CallStackFrame Frame(Info, ArgValues.data());
+ // FIXME: Pass in 'this' for member functions.
+ const LValue *This = 0;
+ CallStackFrame Frame(Info, This, ArgValues.data());
return EvaluateStmt(Result, Info, Body) == ESR_Returned;
}
+/// Evaluate a constructor call.
+static bool HandleConstructorCall(ArrayRef<const Expr*> Args,
+ const CXXConstructorDecl *Definition,
+ EvalInfo &Info, const LValue &This,
+ APValue &Result) {
+ if (Info.NumCalls >= 1000000 || Info.CallStackDepth >= 512)
+ return false;
+
+ ArgVector ArgValues(Args.size());
+ if (!EvaluateArgs(Args, ArgValues, Info))
+ return false;
+
+ CallStackFrame Frame(Info, &This, ArgValues.data());
+
+ // If it's a delegating constructor, just delegate.
+ if (Definition->isDelegatingConstructor()) {
+ CXXConstructorDecl::init_const_iterator I = Definition->init_begin();
+ return EvaluateConstantExpression(Result, Info, This, (*I)->getInit());
+ }
+
+ // Reserve space for the struct members.
+ const CXXRecordDecl *RD = Definition->getParent();
+ if (!RD->isUnion())
+ Result = APValue(APValue::UninitStruct(), RD->getNumBases(),
+ std::distance(RD->field_begin(), RD->field_end()));
+
+ const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);
+
+ unsigned BasesSeen = 0;
+#ifndef NDEBUG
+ CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin();
+#endif
+ for (CXXConstructorDecl::init_const_iterator I = Definition->init_begin(),
+ E = Definition->init_end(); I != E; ++I) {
+ if ((*I)->isBaseInitializer()) {
+ QualType BaseType((*I)->getBaseClass(), 0);
+#ifndef NDEBUG
+ // Non-virtual base classes are initialized in the order in the class
+ // definition. We cannot have a virtual base class for a literal type.
+ assert(!BaseIt->isVirtual() && "virtual base for literal type");
+ assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&
+ "base class initializers not in expected order");
+ ++BaseIt;
+#endif
+ LValue Subobject = This;
+ HandleLValueDirectBase(Info, Subobject, RD,
+ BaseType->getAsCXXRecordDecl(), &Layout);
+ if (!EvaluateConstantExpression(Result.getStructBase(BasesSeen++), Info,
+ Subobject, (*I)->getInit()))
+ return false;
+ } else if (FieldDecl *FD = (*I)->getMember()) {
+ LValue Subobject = This;
+ HandleLValueMember(Info, Subobject, FD, &Layout);
+ if (RD->isUnion()) {
+ Result = APValue(FD);
+ if (!EvaluateConstantExpression(Result.getUnionValue(), Info,
+ Subobject, (*I)->getInit()))
+ return false;
+ } else if (!EvaluateConstantExpression(
+ Result.getStructField(FD->getFieldIndex()),
+ Info, Subobject, (*I)->getInit()))
+ return false;
+ } else {
+ // FIXME: handle indirect field initializers
+ return false;
+ }
+ }
+
+ return true;
+}
+
namespace {
class HasSideEffect
: public ConstStmtVisitor<HasSideEffect, bool> {
RetTy ValueInitialization(const Expr *E) { return DerivedError(E); }
- bool MakeTemporary(const Expr *Key, const Expr *Value, LValue &Result) {
- if (!Evaluate(Info.CurrentCall->Temporaries[Key], Info, Value))
- return false;
- Result.setExpr(Key, Info.CurrentCall);
- return true;
- }
public:
ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {}
return DerivedValueInitialization(E);
}
+ /// A member expression where the object is a prvalue is itself a prvalue.
+ RetTy VisitMemberExpr(const MemberExpr *E) {
+ assert(!E->isArrow() && "missing call to bound member function?");
+
+ CCValue Val;
+ if (!Evaluate(Val, Info, E->getBase()))
+ return false;
+
+ QualType BaseTy = E->getBase()->getType();
+
+ const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl());
+ if (!FD) return false;
+ assert(!FD->getType()->isReferenceType() && "prvalue reference?");
+ assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() ==
+ FD->getParent()->getCanonicalDecl() && "record / field mismatch");
+
+ SubobjectDesignator Designator;
+ Designator.addDecl(FD);
+
+ return ExtractSubobject(Info, Val, BaseTy, Designator, E->getType()) &&
+ DerivedSuccess(Val, E);
+ }
+
RetTy VisitCastExpr(const CastExpr *E) {
switch (E->getCastKind()) {
default:
// * CompoundLiteralExpr in C
// * StringLiteral
// * PredefinedExpr
+// * ObjCStringLiteralExpr
// * ObjCEncodeExpr
// * AddrLabelExpr
// * BlockExpr
Result.Designator.setInvalid();
return true;
- // FIXME: Support CK_DerivedToBase and CK_UncheckedDerivedToBase.
- // Reuse PointerExprEvaluator::VisitCastExpr for these.
+ case CK_DerivedToBase:
+ case CK_UncheckedDerivedToBase: {
+ if (!Visit(E->getSubExpr()))
+ return false;
+
+ // Now figure out the necessary offset to add to the base LV to get from
+ // the derived class to the base class.
+ QualType Type = E->getSubExpr()->getType();
+
+ for (CastExpr::path_const_iterator PathI = E->path_begin(),
+ PathE = E->path_end(); PathI != PathE; ++PathI) {
+ if (!HandleLValueBase(Info, Result, Type->getAsCXXRecordDecl(), *PathI))
+ return false;
+ Type = (*PathI)->getType();
+ }
+
+ return true;
+ }
}
}
}
CCValue V;
- if (EvaluateVarDeclInit(Info, VD, Info.CurrentCall, V))
+ if (EvaluateVarDeclInit(Info, E, VD, Info.CurrentCall, V))
return Success(V, E);
return Error(E);
bool LValueExprEvaluator::VisitMaterializeTemporaryExpr(
const MaterializeTemporaryExpr *E) {
- return MakeTemporary(E, E->GetTemporaryExpr(), Result);
+ Result.setExpr(E, Info.CurrentCall);
+ return EvaluateConstantExpression(Info.CurrentCall->Temporaries[E], Info,
+ Result, E->GetTemporaryExpr());
}
bool
}
}
- QualType Ty;
+ // Handle non-static data members.
+ QualType BaseTy;
if (E->isArrow()) {
if (!EvaluatePointer(E->getBase(), Result, Info))
return false;
- Ty = E->getBase()->getType()->getAs<PointerType>()->getPointeeType();
+
BaseTy = E->getBase()->getType()->getAs<PointerType>()->getPointeeType();
} else {
if (!Visit(E->getBase()))
return false;
- Ty = E->getBase()->getType();
+ BaseTy = E->getBase()->getType();
}
- const RecordDecl *RD = Ty->getAs<RecordType>()->getDecl();
- const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD);
-
const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl());
- if (!FD) // FIXME: deal with other kinds of member expressions
- return false;
+ if (!FD) return false;
+ assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() ==
+ FD->getParent()->getCanonicalDecl() && "record / field mismatch");
+ (void)BaseTy;
- if (FD->getType()->isReferenceType())
- return false;
+ HandleLValueMember(Info, Result, FD);
- unsigned i = FD->getFieldIndex();
- Result.Offset += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i));
- Result.Designator.addDecl(FD);
+ if (FD->getType()->isReferenceType()) {
+ CCValue RefValue;
+ if (!HandleLValueToRValueConversion(Info, FD->getType(), Result, RefValue))
+ return false;
+ return Success(RefValue, E);
+ }
return true;
}
APSInt Index;
if (!EvaluateInteger(E->getIdx(), Index, Info))
return false;
- uint64_t IndexValue
- = Index.isSigned() ? static_cast<uint64_t>(Index.getSExtValue())
- : Index.getZExtValue();
+ int64_t IndexValue
+ = Index.isSigned() ? Index.getSExtValue()
+ : static_cast<int64_t>(Index.getZExtValue());
- CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(E->getType());
- Result.Offset += IndexValue * ElementSize;
- Result.Designator.adjustIndex(IndexValue);
- return true;
+ return HandleLValueArrayAdjustment(Info, Result, E->getType(), IndexValue);
}
bool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) {
}
bool VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E)
{ return ValueInitialization(E); }
+ bool VisitCXXThisExpr(const CXXThisExpr *E) {
+ if (!Info.CurrentCall->This)
+ return false;
+ Result = *Info.CurrentCall->This;
+ return true;
+ }
// FIXME: Missing: @protocol, @selector
};
if (E->getOpcode() == BO_Sub)
AdditionalOffset = -AdditionalOffset;
- // Compute the new offset in the appropriate width.
- QualType PointeeType =
- PExp->getType()->getAs<PointerType>()->getPointeeType();
- CharUnits SizeOfPointee;
-
- // Explicitly handle GNU void* and function pointer arithmetic extensions.
- if (PointeeType->isVoidType() || PointeeType->isFunctionType())
- SizeOfPointee = CharUnits::One();
- else
- SizeOfPointee = Info.Ctx.getTypeSizeInChars(PointeeType);
-
- Result.Offset += AdditionalOffset * SizeOfPointee;
- Result.Designator.adjustIndex(AdditionalOffset);
- return true;
+ QualType Pointee = PExp->getType()->getAs<PointerType>()->getPointeeType();
+ return HandleLValueArrayAdjustment(Info, Result, Pointee, AdditionalOffset);
}
bool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) {
return EvaluateLValue(E->getSubExpr(), Result, Info);
}
-
bool PointerExprEvaluator::VisitCastExpr(const CastExpr* E) {
const Expr* SubExpr = E->getSubExpr();
if (!EvaluatePointer(E->getSubExpr(), Result, Info))
return false;
- // Now figure out the necessary offset to add to the baseLV to get from
+ // Now figure out the necessary offset to add to the base LV to get from
// the derived class to the base class.
- QualType Ty = E->getSubExpr()->getType();
- const CXXRecordDecl *DerivedDecl =
- Ty->getAs<PointerType>()->getPointeeType()->getAsCXXRecordDecl();
+ QualType Type =
+ E->getSubExpr()->getType()->castAs<PointerType>()->getPointeeType();
- for (CastExpr::path_const_iterator PathI = E->path_begin(),
+ for (CastExpr::path_const_iterator PathI = E->path_begin(),
PathE = E->path_end(); PathI != PathE; ++PathI) {
- const CXXBaseSpecifier *Base = *PathI;
-
- // FIXME: If the base is virtual, we'd need to determine the type of the
- // most derived class and we don't support that right now.
- if (Base->isVirtual())
+ if (!HandleLValueBase(Info, Result, Type->getAsCXXRecordDecl(), *PathI))
return false;
-
- const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl();
- const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl);
-
- Result.getLValueOffset() += Layout.getBaseClassOffset(BaseDecl);
- DerivedDecl = BaseDecl;
+ Type = (*PathI)->getType();
}
- // FIXME
- Result.Designator.setInvalid();
-
return true;
}
}
bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) {
- if (E->isBuiltinCall(Info.Ctx) ==
- Builtin::BI__builtin___CFStringMakeConstantString ||
- E->isBuiltinCall(Info.Ctx) ==
- Builtin::BI__builtin___NSStringMakeConstantString)
+ if (IsStringLiteralCall(E))
return Success(E);
return ExprEvaluatorBaseTy::VisitCallExpr(E);
}
+//===----------------------------------------------------------------------===//
+// Record Evaluation
+//===----------------------------------------------------------------------===//
+
+namespace {
+ class RecordExprEvaluator
+ : public ExprEvaluatorBase<RecordExprEvaluator, bool> {
+ const LValue &This;
+ APValue &Result;
+ public:
+
+ RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result)
+ : ExprEvaluatorBaseTy(info), This(This), Result(Result) {}
+
+ bool Success(const CCValue &V, const Expr *E) {
+ return CheckConstantExpression(V, Result);
+ }
+ bool Error(const Expr *E) { return false; }
+
+ bool VisitInitListExpr(const InitListExpr *E);
+ bool VisitCXXConstructExpr(const CXXConstructExpr *E);
+ };
+}
+
+bool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
+ const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl();
+ const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD);
+
+ if (RD->isUnion()) {
+ Result = APValue(E->getInitializedFieldInUnion());
+ if (!E->getNumInits())
+ return true;
+ LValue Subobject = This;
+ HandleLValueMember(Info, Subobject, E->getInitializedFieldInUnion(),
+ &Layout);
+ return EvaluateConstantExpression(Result.getUnionValue(), Info,
+ Subobject, E->getInit(0));
+ }
+
+ assert((!isa<CXXRecordDecl>(RD) || !cast<CXXRecordDecl>(RD)->getNumBases()) &&
+ "initializer list for class with base classes");
+ Result = APValue(APValue::UninitStruct(), 0,
+ std::distance(RD->field_begin(), RD->field_end()));
+ unsigned ElementNo = 0;
+ for (RecordDecl::field_iterator Field = RD->field_begin(),
+ FieldEnd = RD->field_end(); Field != FieldEnd; ++Field) {
+ // Anonymous bit-fields are not considered members of the class for
+ // purposes of aggregate initialization.
+ if (Field->isUnnamedBitfield())
+ continue;
+
+ LValue Subobject = This;
+ HandleLValueMember(Info, Subobject, *Field, &Layout);
+
+ if (ElementNo < E->getNumInits()) {
+ if (!EvaluateConstantExpression(
+ Result.getStructField((*Field)->getFieldIndex()),
+ Info, Subobject, E->getInit(ElementNo++)))
+ return false;
+ } else {
+ // Perform an implicit value-initialization for members beyond the end of
+ // the initializer list.
+ ImplicitValueInitExpr VIE(Field->getType());
+ if (!EvaluateConstantExpression(
+ Result.getStructField((*Field)->getFieldIndex()),
+ Info, Subobject, &VIE))
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) {
+ const CXXConstructorDecl *FD = E->getConstructor();
+ const FunctionDecl *Definition = 0;
+ FD->getBody(Definition);
+
+ if (!Definition || !Definition->isConstexpr() || Definition->isInvalidDecl())
+ return false;
+
+ // FIXME: Elide the copy/move construction wherever we can.
+ if (E->isElidable())
+ if (const MaterializeTemporaryExpr *ME
+ = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0)))
+ return Visit(ME->GetTemporaryExpr());
+
+ llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs());
+ return HandleConstructorCall(Args, cast<CXXConstructorDecl>(Definition),
+ Info, This, Result);
+}
+
+static bool EvaluateRecord(const Expr *E, const LValue &This,
+ APValue &Result, EvalInfo &Info) {
+ assert(E->isRValue() && E->getType()->isRecordType() &&
+ E->getType()->isLiteralType() &&
+ "can't evaluate expression as a record rvalue");
+ return RecordExprEvaluator(Info, This, Result).Visit(E);
+}
+
//===----------------------------------------------------------------------===//
// Vector Evaluation
//===----------------------------------------------------------------------===//
namespace {
class ArrayExprEvaluator
: public ExprEvaluatorBase<ArrayExprEvaluator, bool> {
+ const LValue &This;
APValue &Result;
public:
- ArrayExprEvaluator(EvalInfo &Info, APValue &Result)
- : ExprEvaluatorBaseTy(Info), Result(Result) {}
+ ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result)
+ : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {}
bool Success(const APValue &V, const Expr *E) {
assert(V.isArray() && "Expected array type");
}
bool Error(const Expr *E) { return false; }
+ bool ValueInitialization(const Expr *E) {
+ const ConstantArrayType *CAT =
+ Info.Ctx.getAsConstantArrayType(E->getType());
+ if (!CAT)
+ return false;
+
+ Result = APValue(APValue::UninitArray(), 0,
+ CAT->getSize().getZExtValue());
+ if (!Result.hasArrayFiller()) return true;
+
+ // Value-initialize all elements.
+ LValue Subobject = This;
+ Subobject.Designator.addIndex(0);
+ ImplicitValueInitExpr VIE(CAT->getElementType());
+ return EvaluateConstantExpression(Result.getArrayFiller(), Info,
+ Subobject, &VIE);
+ }
+
+ // FIXME: We also get CXXConstructExpr, in cases like:
+ // struct S { constexpr S(); }; constexpr S s[10];
bool VisitInitListExpr(const InitListExpr *E);
};
} // end anonymous namespace
-static bool EvaluateArray(const Expr* E, APValue& Result, EvalInfo &Info) {
+static bool EvaluateArray(const Expr *E, const LValue &This,
+ APValue &Result, EvalInfo &Info) {
assert(E->isRValue() && E->getType()->isArrayType() &&
E->getType()->isLiteralType() && "not a literal array rvalue");
- return ArrayExprEvaluator(Info, Result).Visit(E);
+ return ArrayExprEvaluator(Info, This, Result).Visit(E);
}
bool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
Result = APValue(APValue::UninitArray(), E->getNumInits(),
CAT->getSize().getZExtValue());
+ LValue Subobject = This;
+ Subobject.Designator.addIndex(0);
+ unsigned Index = 0;
for (InitListExpr::const_iterator I = E->begin(), End = E->end();
- I != End; ++I)
- if (!EvaluateConstantExpression(Result.getArrayInitializedElt(I-E->begin()),
- Info, cast<Expr>(*I)))
+ I != End; ++I, ++Index) {
+ if (!EvaluateConstantExpression(Result.getArrayInitializedElt(Index),
+ Info, Subobject, cast<Expr>(*I)))
+ return false;
+ if (!HandleLValueArrayAdjustment(Info, Subobject, CAT->getElementType(), 1))
return false;
+ }
if (!Result.hasArrayFiller()) return true;
assert(E->hasArrayFiller() && "no array filler for incomplete init list");
+ // FIXME: The Subobject here isn't necessarily right. This rarely matters,
+ // but sometimes does:
+ // struct S { constexpr S() : p(&p) {} void *p; };
+ // S s[10] = {};
return EvaluateConstantExpression(Result.getArrayFiller(), Info,
- E->getArrayFiller());
+ Subobject, E->getArrayFiller());
}
//===----------------------------------------------------------------------===//
}
bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
- switch (E->isBuiltinCall(Info.Ctx)) {
+ switch (E->isBuiltinCall()) {
default:
return ExprEvaluatorBaseTy::VisitCallExpr(E);
QualType Type = E->getLHS()->getType();
QualType ElementType = Type->getAs<PointerType>()->getPointeeType();
- CharUnits ElementSize = CharUnits::One();
- if (!ElementType->isVoidType() && !ElementType->isFunctionType())
- ElementSize = Info.Ctx.getTypeSizeInChars(ElementType);
+ CharUnits ElementSize;
+ if (!HandleSizeof(Info, ElementType, ElementSize))
+ return false;
- CharUnits Diff = LHSValue.getLValueOffset() -
+ CharUnits Diff = LHSValue.getLValueOffset() -
RHSValue.getLValueOffset();
return Success(Diff / ElementSize, E);
}
if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>())
SrcTy = Ref->getPointeeType();
- // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc
- // extension.
- if (SrcTy->isVoidType() || SrcTy->isFunctionType())
- return Success(1, E);
-
- // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2.
- if (!SrcTy->isConstantSizeType())
+ CharUnits Sizeof;
+ if (!HandleSizeof(Info, SrcTy, Sizeof))
return false;
-
- // Get information about the size.
- return Success(Info.Ctx.getTypeSizeInChars(SrcTy), E);
+ return Success(Sizeof, E);
}
}
}
bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
- switch (E->isBuiltinCall(Info.Ctx)) {
+ switch (E->isBuiltinCall()) {
default:
return ExprEvaluatorBaseTy::VisitCallExpr(E);
// FIXME: Implement evaluation of pointer-to-member types.
return false;
} else if (E->getType()->isArrayType() && E->getType()->isLiteralType()) {
- if (!EvaluateArray(E, Result, Info))
+ LValue LV;
+ LV.setExpr(E, Info.CurrentCall);
+ if (!EvaluateArray(E, LV, Info.CurrentCall->Temporaries[E], Info))
return false;
+ Result = Info.CurrentCall->Temporaries[E];
} else if (E->getType()->isRecordType() && E->getType()->isLiteralType()) {
- // FIXME: Implement evaluation of record rvalues.
- return false;
+ LValue LV;
+ LV.setExpr(E, Info.CurrentCall);
+ if (!EvaluateRecord(E, LV, Info.CurrentCall->Temporaries[E], Info))
+ return false;
+ Result = Info.CurrentCall->Temporaries[E];
} else
return false;
/// since later initializers for an object can indirectly refer to subobjects
/// which were initialized earlier.
static bool EvaluateConstantExpression(APValue &Result, EvalInfo &Info,
- const Expr *E) {
+ const LValue &This, const Expr *E) {
if (E->isRValue() && E->getType()->isLiteralType()) {
// Evaluate arrays and record types in-place, so that later initializers can
// refer to earlier-initialized members of the object.
- if (E->getType()->isArrayType()) {
- if (!EvaluateArray(E, Result, Info))
- return false;
- } else if (E->getType()->isRecordType())
- // FIXME: Implement evaluation of record rvalues.
- return false;
+ if (E->getType()->isArrayType())
+ return EvaluateArray(E, This, Result, Info);
+ else if (E->getType()->isRecordType())
+ return EvaluateRecord(E, This, Result, Info);
}
// For any other type, in-place evaluation is unimportant.
EvalInfo Info(Ctx, Result);
+ // FIXME: If this is the initializer for an lvalue, pass that in.
CCValue Value;
if (!::Evaluate(Value, Info, this))
return false;
return false;
}
- // Don't produce array constants until CodeGen is taught to handle them.
- if (Value.isArray())
- return false;
-
// Check this core constant expression is a constant expression, and if so,
// convert it to one.
return CheckConstantExpression(Value, Result.Val);
// constant expressions, but they can never be ICEs because an ICE cannot
// contain an operand of (pointer to) function type.
const CallExpr *CE = cast<CallExpr>(E);
- if (CE->isBuiltinCall(Ctx))
+ if (CE->isBuiltinCall())
return CheckEvalInICE(E, Ctx);
return ICEDiag(2, E->getLocStart());
}
// extension. See GCC PR38377 for discussion.
if (const CallExpr *CallCE
= dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts()))
- if (CallCE->isBuiltinCall(Ctx) == Builtin::BI__builtin_constant_p) {
+ if (CallCE->isBuiltinCall() == Builtin::BI__builtin_constant_p) {
Expr::EvalResult EVResult;
if (!E->EvaluateAsRValue(EVResult, Ctx) || EVResult.HasSideEffects ||
!EVResult.Val.isInt()) {
constexpr int zero() { return 0; }
};
+namespace DerivedToVBaseCast {
+
+ struct U { int n; };
+ struct V : U { int n; };
+ struct A : virtual V { int n; };
+ struct Aa { int n; };
+ struct B : virtual A, Aa {};
+ struct C : virtual A, Aa {};
+ struct D : B, C {};
+
+ D d;
+ constexpr B *p = &d;
+ constexpr C *q = &d;
+ static_assert_fold((void*)p != (void*)q, "");
+ static_assert_fold((A*)p == (A*)q, "");
+ static_assert_fold((Aa*)p != (Aa*)q, "");
+
+ constexpr B &pp = d;
+ constexpr C &qq = d;
+ static_assert_fold((void*)&pp != (void*)&qq, "");
+ static_assert_fold(&(A&)pp == &(A&)qq, "");
+ static_assert_fold(&(Aa&)pp != &(Aa&)qq, "");
+
+ constexpr V *v = p;
+ constexpr V *w = q;
+ constexpr V *x = (A*)p;
+ static_assert_fold(v == w, "");
+ static_assert_fold(v == x, "");
+
+ static_assert_fold((U*)&d == p, "");
+ static_assert_fold((U*)&d == q, "");
+ static_assert_fold((U*)&d == v, "");
+ static_assert_fold((U*)&d == w, "");
+ static_assert_fold((U*)&d == x, "");
+
+ struct X {};
+ struct Y1 : virtual X {};
+ struct Y2 : X {};
+ struct Z : Y1, Y2 {};
+ Z z;
+ static_assert_fold((X*)(Y1*)&z != (X*)(Y2*)&z, "");
+
+}
+
namespace TemplateArgumentConversion {
template<int n> struct IntParam {};
}
+constexpr int strcmp_ce(const char *p, const char *q) {
+ return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1);
+}
+
namespace StringLiteral {
// FIXME: Refactor this once we support constexpr templates.
static_assert_fold(*max == 'z', "");
static_assert_fold(max == str + 38, "");
+static_assert_fold(strcmp_ce("hello world", "hello world") == 0, "");
+static_assert_fold(strcmp_ce("hello world", "hello clang") > 0, "");
+static_assert_fold(strcmp_ce("constexpr", "test") < 0, "");
+static_assert_fold(strcmp_ce("", " ") < 0, "");
+
}
namespace Array {
static_assert_fold(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}}
static_assert_fold((&zs[0][0][0][2])[-1] == 2, "");
static_assert_fold(**(**(zs + 1) + 1) == 11, "");
+static_assert_fold(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, "");
+
+constexpr int arr[40] = { 1, 2, 3, [8] = 4 };
+constexpr int SumNonzero(const int *p) {
+ return *p + (*p ? SumNonzero(p+1) : 0);
+}
+constexpr int CountZero(const int *p, const int *q) {
+ return p == q ? 0 : (*p == 0) + CountZero(p+1, q);
+}
+static_assert_fold(SumNonzero(arr) == 6, "");
+static_assert_fold(CountZero(arr, arr + 40) == 36, "");
}
};
}
+
+namespace Class {
+
+struct A { constexpr A(int a, int b) : k(a + b) {} int k; };
+constexpr int fn(const A &a) { return a.k; }
+static_assert_fold(fn(A(4,5)) == 9, "");
+
+struct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}}
+struct C {
+ constexpr C(C *this_) : m(42), n(this_->m) {} // ok
+ int m, n;
+};
+struct D {
+ C c;
+ constexpr D() : c(&c) {}
+};
+static_assert_fold(D().c.n == 42, "");
+
+struct E {
+ constexpr E() : p(&p) {}
+ void *p;
+};
+constexpr const E &e1 = E(); // expected-error {{constant expression}}
+// This is a constant expression if we elide the copy constructor call, and
+// is not a constant expression if we don't! But we do, so it is.
+// FIXME: The move constructor is not currently implicitly defined as constexpr.
+// We notice this when evaluating an expression which uses it, but not when
+// checking its initializer.
+constexpr E e2 = E(); // unexpected-error {{constant expression}}
+static_assert_fold(e2.p == &e2.p, ""); // unexpected-error {{constant expression}}
+// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the
+// initializer of this declaration.
+constexpr E e3; // unexpected-error {{constant expression}}
+static_assert_fold(e3.p == &e3.p, "");
+
+extern const class F f;
+struct F {
+ constexpr F() : p(&f.p) {}
+ const void *p;
+};
+constexpr F f = F();
+
+struct G {
+ struct T {
+ constexpr T(T *p) : u1(), u2(p) {}
+ union U1 {
+ constexpr U1() {}
+ int a, b = 42;
+ } u1;
+ union U2 {
+ constexpr U2(T *p) : c(p->u1.b) {}
+ int c, d;
+ } u2;
+ } t;
+ constexpr G() : t(&t) {}
+} constexpr g;
+
+static_assert_fold(g.t.u1.a == 42, ""); // expected-error {{constant expression}}
+static_assert_fold(g.t.u1.b == 42, "");
+static_assert_fold(g.t.u2.c == 42, "");
+static_assert_fold(g.t.u2.d == 42, ""); // expected-error {{constant expression}}
+
+struct S {
+ int a, b;
+ const S *p;
+ double d;
+ const char *q;
+
+ constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {}
+};
+
+S global(43, &global);
+
+static_assert_fold(S(15, &global).b == 15, "");
+
+constexpr bool CheckS(const S &s) {
+ return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l';
+}
+static_assert_fold(CheckS(S(27, &global)), "");
+
+struct Arr {
+ char arr[3];
+ constexpr Arr() : arr{'x', 'y', 'z'} {}
+};
+constexpr int hash(Arr &&a) {
+ return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000;
+}
+constexpr int k = hash(Arr());
+static_assert_fold(k == 0x007a7978, "");
+
+
+struct AggregateInit {
+ const char &c;
+ int n;
+ double d;
+ int arr[5];
+ void *p;
+};
+
+constexpr AggregateInit agg1 = { "hello"[0] };
+
+static_assert_fold(strcmp_ce(&agg1.c, "hello") == 0, "");
+static_assert_fold(agg1.n == 0, "");
+static_assert_fold(agg1.d == 0.0, "");
+static_assert_fold(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}}
+static_assert_fold(agg1.arr[0] == 0, "");
+static_assert_fold(agg1.arr[4] == 0, "");
+static_assert_fold(agg1.arr[5] == 0, ""); // expected-error {{constant expression}}
+static_assert_fold(agg1.p == nullptr, "");
+
+namespace SimpleDerivedClass {
+
+struct B {
+ constexpr B(int n) : a(n) {}
+ int a;
+};
+struct D : B {
+ constexpr D(int n) : B(n) {}
+};
+constexpr D d(3);
+static_assert_fold(d.a == 3, "");
+
+}
+
+struct Base {
+ constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {}
+ int a;
+ const char *b;
+};
+struct Base2 {
+ constexpr Base2(const int &r) : r(r) {}
+ int q = 123;
+ // FIXME: When we track the global for which we are computing the initializer,
+ // use a reference here.
+ //const int &r;
+ int r;
+};
+struct Derived : Base, Base2 {
+ constexpr Derived() : Base(76), Base2(a) {}
+ int c = r + b[1];
+};
+
+constexpr bool operator==(const Base &a, const Base &b) {
+ return a.a == b.a && strcmp_ce(a.b, b.b) == 0;
+}
+
+constexpr Base base;
+constexpr Base base2(76);
+constexpr Derived derived;
+static_assert_fold(derived.a == 76, "");
+static_assert_fold(derived.b[2] == 's', "");
+static_assert_fold(derived.c == 76 + 'e', "");
+static_assert_fold(derived.q == 123, "");
+static_assert_fold(derived.r == 76, "");
+static_assert_fold(&derived.r == &derived.a, ""); // expected-error {{}}
+
+static_assert_fold(!(derived == base), "");
+static_assert_fold(derived == base2, "");
+
+}
+
+namespace Union {
+
+union U {
+ int a;
+ int b;
+};
+
+constexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } };
+static_assert_fold(u[0].a == 0, "");
+static_assert_fold(u[0].b, ""); // expected-error {{constant expression}}
+static_assert_fold(u[1].b == 1, "");
+static_assert_fold((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}}
+static_assert_fold(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}}
+static_assert_fold((&(u[1]) + 1 + 1)->b == 3, "");
+
+}
projects / clang / commitdiff