Introduce Expr::Classify and Expr::ClassifyModifiable, which determine the classification of an expression under the C++0x taxology (value category). Reimplement isLvalue and isModifiableLvalue using these functions. No regressions in the test suite from this, and my rough performance check doesn't show any regressions either.
llvm-svn: 107007
This commit is contained in:
parent
2dd4307e45
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f9463106b3
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@ -162,9 +162,6 @@ public:
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};
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isLvalueResult isLvalue(ASTContext &Ctx) const;
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// Same as above, but excluding checks for non-object and void types in C
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isLvalueResult isLvalueInternal(ASTContext &Ctx) const;
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/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
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/// does not have an incomplete type, does not have a const-qualified type,
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/// and if it is a structure or union, does not have any member (including,
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@ -194,6 +191,95 @@ public:
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isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx,
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SourceLocation *Loc = 0) const;
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/// \brief The return type of classify(). Represents the C++0x expression
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/// taxonomy.
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class Classification {
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public:
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/// \brief The various classification results. Most of these mean prvalue.
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enum Kinds {
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CL_LValue,
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CL_XValue,
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CL_Function, // Functions cannot be lvalues in C.
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CL_Void, // Void cannot be an lvalue in C.
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CL_DuplicateVectorComponents, // A vector shuffle with dupes.
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CL_MemberFunction, // An expression referring to a member function
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CL_SubObjCPropertySetting,
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CL_ClassTemporary, // A prvalue of class type
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CL_PRValue // A prvalue for any other reason, of any other type
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};
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/// \brief The results of modification testing.
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enum ModifiableType {
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CM_Untested, // testModifiable was false.
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CM_Modifiable,
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CM_RValue, // Not modifiable because it's an rvalue
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CM_Function, // Not modifiable because it's a function; C++ only
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CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext
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CM_NotBlockQualified, // Not captured in the closure
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CM_NoSetterProperty,// Implicit assignment to ObjC property without setter
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CM_ConstQualified,
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CM_ArrayType,
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CM_IncompleteType
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};
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private:
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friend class Expr;
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unsigned short Kind;
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unsigned short Modifiable;
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explicit Classification(Kinds k, ModifiableType m)
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: Kind(k), Modifiable(m)
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{}
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public:
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Classification() {}
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Kinds getKind() const { return static_cast<Kinds>(Kind); }
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ModifiableType getModifiable() const {
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assert(Modifiable != CM_Untested && "Did not test for modifiability.");
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return static_cast<ModifiableType>(Modifiable);
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}
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bool isLValue() const { return Kind == CL_LValue; }
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bool isXValue() const { return Kind == CL_XValue; }
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bool isGLValue() const { return Kind <= CL_XValue; }
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bool isPRValue() const { return Kind >= CL_Function; }
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bool isRValue() const { return Kind >= CL_XValue; }
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bool isModifiable() const { return getModifiable() == CM_Modifiable; }
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};
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/// \brief classify - Classify this expression according to the C++0x
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/// expression taxonomy.
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///
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/// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the
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/// old lvalue vs rvalue. This function determines the type of expression this
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/// is. There are three expression types:
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/// - lvalues are classical lvalues as in C++03.
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/// - prvalues are equivalent to rvalues in C++03.
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/// - xvalues are expressions yielding unnamed rvalue references, e.g. a
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/// function returning an rvalue reference.
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/// lvalues and xvalues are collectively referred to as glvalues, while
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/// prvalues and xvalues together form rvalues.
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/// If a
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Classification Classify(ASTContext &Ctx) const {
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return ClassifyImpl(Ctx, 0);
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}
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/// \brief classifyModifiable - Classify this expression according to the
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/// C++0x expression taxonomy, and see if it is valid on the left side
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/// of an assignment.
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///
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/// This function extends classify in that it also tests whether the
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/// expression is modifiable (C99 6.3.2.1p1).
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/// \param Loc A source location that might be filled with a relevant location
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/// if the expression is not modifiable.
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Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{
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return ClassifyImpl(Ctx, &Loc);
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}
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private:
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Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const;
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public:
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/// \brief If this expression refers to a bit-field, retrieve the
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/// declaration of that bit-field.
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FieldDecl *getBitField();
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@ -18,6 +18,7 @@ add_clang_library(clangAST
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DeclPrinter.cpp
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DeclTemplate.cpp
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Expr.cpp
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ExprClassification.cpp
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ExprConstant.cpp
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ExprCXX.cpp
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FullExpr.cpp
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@ -1146,378 +1146,6 @@ bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
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}
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}
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/// DeclCanBeLvalue - Determine whether the given declaration can be
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/// an lvalue. This is a helper routine for isLvalue.
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static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) {
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// C++ [temp.param]p6:
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// A non-type non-reference template-parameter is not an lvalue.
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if (const NonTypeTemplateParmDecl *NTTParm
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= dyn_cast<NonTypeTemplateParmDecl>(Decl))
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return NTTParm->getType()->isReferenceType();
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return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) ||
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// C++ 3.10p2: An lvalue refers to an object or function.
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(Ctx.getLangOptions().CPlusPlus &&
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(isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl)));
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}
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/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an
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/// incomplete type other than void. Nonarray expressions that can be lvalues:
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/// - name, where name must be a variable
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/// - e[i]
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/// - (e), where e must be an lvalue
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/// - e.name, where e must be an lvalue
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/// - e->name
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/// - *e, the type of e cannot be a function type
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/// - string-constant
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/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension]
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/// - reference type [C++ [expr]]
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///
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Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
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assert(!TR->isReferenceType() && "Expressions can't have reference type.");
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isLvalueResult Res = isLvalueInternal(Ctx);
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if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus)
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return Res;
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// first, check the type (C99 6.3.2.1). Expressions with function
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// type in C are not lvalues, but they can be lvalues in C++.
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if (TR->isFunctionType() || TR == Ctx.OverloadTy)
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return LV_NotObjectType;
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// Allow qualified void which is an incomplete type other than void (yuck).
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if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers())
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return LV_IncompleteVoidType;
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return LV_Valid;
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}
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// Check whether the expression can be sanely treated like an l-value
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Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const {
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switch (getStmtClass()) {
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case ObjCIsaExprClass:
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case StringLiteralClass: // C99 6.5.1p4
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case ObjCEncodeExprClass: // @encode behaves like its string in every way.
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return LV_Valid;
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case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2))))
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// For vectors, make sure base is an lvalue (i.e. not a function call).
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if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType())
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return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx);
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return LV_Valid;
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case DeclRefExprClass: { // C99 6.5.1p2
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const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl();
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if (DeclCanBeLvalue(RefdDecl, Ctx))
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return LV_Valid;
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break;
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}
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case BlockDeclRefExprClass: {
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const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this);
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if (isa<VarDecl>(BDR->getDecl()))
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return LV_Valid;
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break;
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}
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case MemberExprClass: {
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const MemberExpr *m = cast<MemberExpr>(this);
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if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4:
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NamedDecl *Member = m->getMemberDecl();
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// C++ [expr.ref]p4:
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// If E2 is declared to have type "reference to T", then E1.E2
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// is an lvalue.
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if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
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if (Value->getType()->isReferenceType())
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return LV_Valid;
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// -- If E2 is a static data member [...] then E1.E2 is an lvalue.
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if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
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return LV_Valid;
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// -- If E2 is a non-static data member [...]. If E1 is an
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// lvalue, then E1.E2 is an lvalue.
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if (isa<FieldDecl>(Member)) {
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if (m->isArrow())
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return LV_Valid;
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return m->getBase()->isLvalue(Ctx);
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}
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// -- If it refers to a static member function [...], then
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// E1.E2 is an lvalue.
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// -- Otherwise, if E1.E2 refers to a non-static member
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// function [...], then E1.E2 is not an lvalue.
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if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
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return Method->isStatic()? LV_Valid : LV_MemberFunction;
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// -- If E2 is a member enumerator [...], the expression E1.E2
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// is not an lvalue.
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if (isa<EnumConstantDecl>(Member))
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return LV_InvalidExpression;
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// Not an lvalue.
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return LV_InvalidExpression;
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}
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// C99 6.5.2.3p4
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if (m->isArrow())
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return LV_Valid;
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Expr *BaseExp = m->getBase();
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if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass ||
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BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass)
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return LV_SubObjCPropertySetting;
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return
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BaseExp->isLvalue(Ctx);
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}
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case UnaryOperatorClass:
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if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref)
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return LV_Valid; // C99 6.5.3p4
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if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real ||
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cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag ||
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cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension)
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return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU.
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if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1
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(cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc ||
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cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec))
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return LV_Valid;
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break;
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case ImplicitCastExprClass:
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if (cast<ImplicitCastExpr>(this)->isLvalueCast())
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return LV_Valid;
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// If this is a conversion to a class temporary, make a note of
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// that.
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if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType())
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return LV_ClassTemporary;
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break;
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case ParenExprClass: // C99 6.5.1p5
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return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx);
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case BinaryOperatorClass:
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case CompoundAssignOperatorClass: {
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const BinaryOperator *BinOp = cast<BinaryOperator>(this);
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if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1
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BinOp->getOpcode() == BinaryOperator::Comma)
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return BinOp->getRHS()->isLvalue(Ctx);
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// C++ [expr.mptr.oper]p6
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// The result of a .* expression is an lvalue only if its first operand is
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// an lvalue and its second operand is a pointer to data member.
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if (BinOp->getOpcode() == BinaryOperator::PtrMemD &&
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!BinOp->getType()->isFunctionType())
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return BinOp->getLHS()->isLvalue(Ctx);
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// The result of an ->* expression is an lvalue only if its second operand
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// is a pointer to data member.
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if (BinOp->getOpcode() == BinaryOperator::PtrMemI &&
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!BinOp->getType()->isFunctionType()) {
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QualType Ty = BinOp->getRHS()->getType();
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if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType())
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return LV_Valid;
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}
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if (!BinOp->isAssignmentOp())
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return LV_InvalidExpression;
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if (Ctx.getLangOptions().CPlusPlus)
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// C++ [expr.ass]p1:
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// The result of an assignment operation [...] is an lvalue.
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return LV_Valid;
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// C99 6.5.16:
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// An assignment expression [...] is not an lvalue.
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return LV_InvalidExpression;
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}
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case CallExprClass:
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case CXXOperatorCallExprClass:
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case CXXMemberCallExprClass: {
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// C++0x [expr.call]p10
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// A function call is an lvalue if and only if the result type
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// is an lvalue reference.
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QualType ReturnType = cast<CallExpr>(this)->getCallReturnType();
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if (ReturnType->isLValueReferenceType())
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return LV_Valid;
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// If the function is returning a class temporary, make a note of
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// that.
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if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType())
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return LV_ClassTemporary;
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break;
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}
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case CompoundLiteralExprClass: // C99 6.5.2.5p5
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// FIXME: Is this what we want in C++?
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return LV_Valid;
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case ChooseExprClass:
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// __builtin_choose_expr is an lvalue if the selected operand is.
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return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx);
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case ExtVectorElementExprClass:
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if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements())
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return LV_DuplicateVectorComponents;
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return LV_Valid;
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case ObjCIvarRefExprClass: // ObjC instance variables are lvalues.
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return LV_Valid;
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case ObjCPropertyRefExprClass: // FIXME: check if read-only property.
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return LV_Valid;
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case ObjCImplicitSetterGetterRefExprClass:
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// FIXME: check if read-only property.
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return LV_Valid;
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case PredefinedExprClass:
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return LV_Valid;
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case UnresolvedLookupExprClass:
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case UnresolvedMemberExprClass:
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return LV_Valid;
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case CXXDefaultArgExprClass:
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return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx);
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case CStyleCastExprClass:
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case CXXFunctionalCastExprClass:
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case CXXStaticCastExprClass:
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case CXXDynamicCastExprClass:
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case CXXReinterpretCastExprClass:
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case CXXConstCastExprClass:
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// The result of an explicit cast is an lvalue if the type we are
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// casting to is an lvalue reference type. See C++ [expr.cast]p1,
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// C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2,
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// C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1.
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if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()->
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isLValueReferenceType())
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return LV_Valid;
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// If this is a conversion to a class temporary, make a note of
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// that.
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if (Ctx.getLangOptions().CPlusPlus &&
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cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType())
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return LV_ClassTemporary;
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break;
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case CXXTypeidExprClass:
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// C++ 5.2.8p1: The result of a typeid expression is an lvalue of ...
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return LV_Valid;
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case CXXBindTemporaryExprClass:
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return cast<CXXBindTemporaryExpr>(this)->getSubExpr()->
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isLvalueInternal(Ctx);
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case CXXBindReferenceExprClass:
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// Something that's bound to a reference is always an lvalue.
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return LV_Valid;
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case ConditionalOperatorClass: {
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// Complicated handling is only for C++.
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if (!Ctx.getLangOptions().CPlusPlus)
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return LV_InvalidExpression;
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// Sema should have taken care to ensure that a CXXTemporaryObjectExpr is
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// everywhere there's an object converted to an rvalue. Also, any other
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// casts should be wrapped by ImplicitCastExprs. There's just the special
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// case involving throws to work out.
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const ConditionalOperator *Cond = cast<ConditionalOperator>(this);
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Expr *True = Cond->getTrueExpr();
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Expr *False = Cond->getFalseExpr();
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// C++0x 5.16p2
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// If either the second or the third operand has type (cv) void, [...]
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// the result [...] is an rvalue.
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if (True->getType()->isVoidType() || False->getType()->isVoidType())
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return LV_InvalidExpression;
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// Both sides must be lvalues for the result to be an lvalue.
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if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid)
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return LV_InvalidExpression;
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// That's it.
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return LV_Valid;
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}
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case Expr::CXXExprWithTemporariesClass:
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return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx);
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case Expr::ObjCMessageExprClass:
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if (const ObjCMethodDecl *Method
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= cast<ObjCMessageExpr>(this)->getMethodDecl())
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if (Method->getResultType()->isLValueReferenceType())
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return LV_Valid;
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break;
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case Expr::CXXConstructExprClass:
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case Expr::CXXTemporaryObjectExprClass:
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case Expr::CXXZeroInitValueExprClass:
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return LV_ClassTemporary;
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default:
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break;
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}
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return LV_InvalidExpression;
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}
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/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
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/// does not have an incomplete type, does not have a const-qualified type, and
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/// if it is a structure or union, does not have any member (including,
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/// recursively, any member or element of all contained aggregates or unions)
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/// with a const-qualified type.
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Expr::isModifiableLvalueResult
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Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
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isLvalueResult lvalResult = isLvalue(Ctx);
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|
||||
switch (lvalResult) {
|
||||
case LV_Valid:
|
||||
// C++ 3.10p11: Functions cannot be modified, but pointers to
|
||||
// functions can be modifiable.
|
||||
if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType())
|
||||
return MLV_NotObjectType;
|
||||
break;
|
||||
|
||||
case LV_NotObjectType: return MLV_NotObjectType;
|
||||
case LV_IncompleteVoidType: return MLV_IncompleteVoidType;
|
||||
case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
|
||||
case LV_InvalidExpression:
|
||||
// If the top level is a C-style cast, and the subexpression is a valid
|
||||
// lvalue, then this is probably a use of the old-school "cast as lvalue"
|
||||
// GCC extension. We don't support it, but we want to produce good
|
||||
// diagnostics when it happens so that the user knows why.
|
||||
if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) {
|
||||
if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) {
|
||||
if (Loc)
|
||||
*Loc = CE->getLParenLoc();
|
||||
return MLV_LValueCast;
|
||||
}
|
||||
}
|
||||
return MLV_InvalidExpression;
|
||||
case LV_MemberFunction: return MLV_MemberFunction;
|
||||
case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting;
|
||||
case LV_ClassTemporary:
|
||||
return MLV_ClassTemporary;
|
||||
}
|
||||
|
||||
// The following is illegal:
|
||||
// void takeclosure(void (^C)(void));
|
||||
// void func() { int x = 1; takeclosure(^{ x = 7; }); }
|
||||
//
|
||||
if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) {
|
||||
if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
|
||||
return MLV_NotBlockQualified;
|
||||
}
|
||||
|
||||
// Assigning to an 'implicit' property?
|
||||
if (const ObjCImplicitSetterGetterRefExpr* Expr =
|
||||
dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) {
|
||||
if (Expr->getSetterMethod() == 0)
|
||||
return MLV_NoSetterProperty;
|
||||
}
|
||||
|
||||
QualType CT = Ctx.getCanonicalType(getType());
|
||||
|
||||
if (CT.isConstQualified())
|
||||
return MLV_ConstQualified;
|
||||
if (CT->isArrayType())
|
||||
return MLV_ArrayType;
|
||||
if (CT->isIncompleteType())
|
||||
return MLV_IncompleteType;
|
||||
|
||||
if (const RecordType *r = CT->getAs<RecordType>()) {
|
||||
if (r->hasConstFields())
|
||||
return MLV_ConstQualified;
|
||||
}
|
||||
|
||||
return MLV_Valid;
|
||||
}
|
||||
|
||||
/// isOBJCGCCandidate - Check if an expression is objc gc'able.
|
||||
/// returns true, if it is; false otherwise.
|
||||
bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
|
||||
|
|
|
@ -0,0 +1,470 @@
|
|||
//===--- ExprClassification.cpp - Expression AST Node Implementation ------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file implements Expr::classify.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "clang/AST/Expr.h"
|
||||
#include "clang/AST/ExprCXX.h"
|
||||
#include "clang/AST/ExprObjC.h"
|
||||
#include "clang/AST/ASTContext.h"
|
||||
#include "clang/AST/DeclObjC.h"
|
||||
#include "clang/AST/DeclCXX.h"
|
||||
#include "clang/AST/DeclTemplate.h"
|
||||
using namespace clang;
|
||||
|
||||
typedef Expr::Classification Cl;
|
||||
|
||||
static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E);
|
||||
static Cl::Kinds ClassifyDecl(ASTContext &Ctx, const Decl *D);
|
||||
static Cl::Kinds ClassifyUnnamed(ASTContext &Ctx, QualType T);
|
||||
static Cl::Kinds ClassifyMemberExpr(ASTContext &Ctx, const MemberExpr *E);
|
||||
static Cl::Kinds ClassifyBinaryOp(ASTContext &Ctx, const BinaryOperator *E);
|
||||
static Cl::Kinds ClassifyConditional(ASTContext &Ctx,
|
||||
const ConditionalOperator *E);
|
||||
static Cl::ModifiableType IsModifiable(ASTContext &Ctx, const Expr *E,
|
||||
Cl::Kinds Kind, SourceLocation &Loc);
|
||||
|
||||
Cl Expr::ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const {
|
||||
assert(!TR->isReferenceType() && "Expressions can't have reference type.");
|
||||
|
||||
Cl::Kinds kind = ClassifyInternal(Ctx, this);
|
||||
// C99 6.3.2.1: An lvalue is an expression with an object type or an
|
||||
// incomplete type other than void.
|
||||
if (!Ctx.getLangOptions().CPlusPlus) {
|
||||
// Thus, no functions.
|
||||
if (TR->isFunctionType() || TR == Ctx.OverloadTy)
|
||||
kind = Cl::CL_Function;
|
||||
// No void either, but qualified void is OK because it is "other than void".
|
||||
else if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers())
|
||||
kind = Cl::CL_Void;
|
||||
}
|
||||
|
||||
Cl::ModifiableType modifiable = Cl::CM_Untested;
|
||||
if (Loc)
|
||||
modifiable = IsModifiable(Ctx, this, kind, *Loc);
|
||||
return Classification(kind, modifiable);
|
||||
}
|
||||
|
||||
static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
|
||||
// This function takes the first stab at classifying expressions.
|
||||
const LangOptions &Lang = Ctx.getLangOptions();
|
||||
|
||||
switch (E->getStmtClass()) {
|
||||
// First come the expressions that are always lvalues, unconditionally.
|
||||
|
||||
case Expr::ObjCIsaExprClass:
|
||||
// C++ [expr.prim.general]p1: A string literal is an lvalue.
|
||||
case Expr::StringLiteralClass:
|
||||
// @encode is equivalent to its string
|
||||
case Expr::ObjCEncodeExprClass:
|
||||
// __func__ and friends are too.
|
||||
case Expr::PredefinedExprClass:
|
||||
// Property references are lvalues
|
||||
case Expr::ObjCPropertyRefExprClass:
|
||||
case Expr::ObjCImplicitSetterGetterRefExprClass:
|
||||
// C++ [expr.typeid]p1: The result of a typeid expression is an lvalue of...
|
||||
case Expr::CXXTypeidExprClass:
|
||||
// Unresolved lookups get classified as lvalues.
|
||||
// FIXME: Is this wise? Should they get their own kind?
|
||||
case Expr::UnresolvedLookupExprClass:
|
||||
case Expr::UnresolvedMemberExprClass:
|
||||
// ObjC instance variables are lvalues
|
||||
// FIXME: ObjC++0x might have different rules
|
||||
case Expr::ObjCIvarRefExprClass:
|
||||
// C99 6.5.2.5p5 says that compound literals are lvalues.
|
||||
// FIXME: C++ might have a different opinion.
|
||||
case Expr::CompoundLiteralExprClass:
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// Next come the complicated cases.
|
||||
|
||||
// C++ [expr.sub]p1: The result is an lvalue of type "T".
|
||||
// However, subscripting vector types is more like member access.
|
||||
case Expr::ArraySubscriptExprClass:
|
||||
if (cast<ArraySubscriptExpr>(E)->getBase()->getType()->isVectorType())
|
||||
return ClassifyInternal(Ctx, cast<ArraySubscriptExpr>(E)->getBase());
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// C++ [expr.prim.general]p3: The result is an lvalue if the entity is a
|
||||
// function or variable and a prvalue otherwise.
|
||||
case Expr::DeclRefExprClass:
|
||||
return ClassifyDecl(Ctx, cast<DeclRefExpr>(E)->getDecl());
|
||||
// We deal with names referenced from blocks the same way.
|
||||
case Expr::BlockDeclRefExprClass:
|
||||
return ClassifyDecl(Ctx, cast<BlockDeclRefExpr>(E)->getDecl());
|
||||
|
||||
// Member access is complex.
|
||||
case Expr::MemberExprClass:
|
||||
return ClassifyMemberExpr(Ctx, cast<MemberExpr>(E));
|
||||
|
||||
case Expr::UnaryOperatorClass:
|
||||
switch (cast<UnaryOperator>(E)->getOpcode()) {
|
||||
// C++ [expr.unary.op]p1: The unary * operator performs indirection:
|
||||
// [...] the result is an lvalue referring to the object or function
|
||||
// to which the expression points.
|
||||
case UnaryOperator::Deref:
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// GNU extensions, simply look through them.
|
||||
case UnaryOperator::Real:
|
||||
case UnaryOperator::Imag:
|
||||
case UnaryOperator::Extension:
|
||||
return ClassifyInternal(Ctx, cast<UnaryOperator>(E)->getSubExpr());
|
||||
|
||||
// C++ [expr.pre.incr]p1: The result is the updated operand; it is an
|
||||
// lvalue, [...]
|
||||
// Not so in C.
|
||||
case UnaryOperator::PreInc:
|
||||
case UnaryOperator::PreDec:
|
||||
return Lang.CPlusPlus ? Cl::CL_LValue : Cl::CL_PRValue;
|
||||
|
||||
default:
|
||||
return Cl::CL_PRValue;
|
||||
}
|
||||
|
||||
// Implicit casts are lvalues if they're lvalue casts. Other than that, we
|
||||
// only specifically record class temporaries.
|
||||
case Expr::ImplicitCastExprClass:
|
||||
if (cast<ImplicitCastExpr>(E)->isLvalueCast())
|
||||
return Cl::CL_LValue;
|
||||
return Lang.CPlusPlus && E->getType()->isRecordType() ?
|
||||
Cl::CL_ClassTemporary : Cl::CL_PRValue;
|
||||
|
||||
// C++ [expr.prim.general]p4: The presence of parentheses does not affect
|
||||
// whether the expression is an lvalue.
|
||||
case Expr::ParenExprClass:
|
||||
return ClassifyInternal(Ctx, cast<ParenExpr>(E)->getSubExpr());
|
||||
|
||||
case Expr::BinaryOperatorClass:
|
||||
case Expr::CompoundAssignOperatorClass:
|
||||
// C doesn't have any binary expressions that are lvalues.
|
||||
if (Lang.CPlusPlus)
|
||||
return ClassifyBinaryOp(Ctx, cast<BinaryOperator>(E));
|
||||
return Cl::CL_PRValue;
|
||||
|
||||
case Expr::CallExprClass:
|
||||
case Expr::CXXOperatorCallExprClass:
|
||||
case Expr::CXXMemberCallExprClass:
|
||||
return ClassifyUnnamed(Ctx, cast<CallExpr>(E)->getCallReturnType());
|
||||
|
||||
// __builtin_choose_expr is equivalent to the chosen expression.
|
||||
case Expr::ChooseExprClass:
|
||||
return ClassifyInternal(Ctx, cast<ChooseExpr>(E)->getChosenSubExpr(Ctx));
|
||||
|
||||
// Extended vector element access is an lvalue unless there are duplicates
|
||||
// in the shuffle expression.
|
||||
case Expr::ExtVectorElementExprClass:
|
||||
return cast<ExtVectorElementExpr>(E)->containsDuplicateElements() ?
|
||||
Cl::CL_DuplicateVectorComponents : Cl::CL_LValue;
|
||||
|
||||
// Simply look at the actual default argument.
|
||||
case Expr::CXXDefaultArgExprClass:
|
||||
return ClassifyInternal(Ctx, cast<CXXDefaultArgExpr>(E)->getExpr());
|
||||
|
||||
// Same idea for temporary binding.
|
||||
case Expr::CXXBindTemporaryExprClass:
|
||||
return ClassifyInternal(Ctx, cast<CXXBindTemporaryExpr>(E)->getSubExpr());
|
||||
|
||||
// And the temporary lifetime guard.
|
||||
case Expr::CXXExprWithTemporariesClass:
|
||||
return ClassifyInternal(Ctx, cast<CXXExprWithTemporaries>(E)->getSubExpr());
|
||||
|
||||
// Casts depend completely on the target type. All casts work the same.
|
||||
case Expr::CStyleCastExprClass:
|
||||
case Expr::CXXFunctionalCastExprClass:
|
||||
case Expr::CXXStaticCastExprClass:
|
||||
case Expr::CXXDynamicCastExprClass:
|
||||
case Expr::CXXReinterpretCastExprClass:
|
||||
case Expr::CXXConstCastExprClass:
|
||||
// Only in C++ can casts be interesting at all.
|
||||
if (!Lang.CPlusPlus) return Cl::CL_PRValue;
|
||||
return ClassifyUnnamed(Ctx, cast<ExplicitCastExpr>(E)->getTypeAsWritten());
|
||||
|
||||
case Expr::ConditionalOperatorClass:
|
||||
// Once again, only C++ is interesting.
|
||||
if (!Lang.CPlusPlus) return Cl::CL_PRValue;
|
||||
return ClassifyConditional(Ctx, cast<ConditionalOperator>(E));
|
||||
|
||||
// ObjC message sends are effectively function calls, if the target function
|
||||
// is known.
|
||||
case Expr::ObjCMessageExprClass:
|
||||
if (const ObjCMethodDecl *Method =
|
||||
cast<ObjCMessageExpr>(E)->getMethodDecl()) {
|
||||
return ClassifyUnnamed(Ctx, Method->getResultType());
|
||||
}
|
||||
|
||||
// Some C++ expressions are always class temporaries.
|
||||
case Expr::CXXConstructExprClass:
|
||||
case Expr::CXXTemporaryObjectExprClass:
|
||||
case Expr::CXXZeroInitValueExprClass:
|
||||
return Cl::CL_ClassTemporary;
|
||||
|
||||
// Everything we haven't handled is a prvalue.
|
||||
default:
|
||||
return Cl::CL_PRValue;
|
||||
}
|
||||
}
|
||||
|
||||
/// ClassifyDecl - Return the classification of an expression referencing the
|
||||
/// given declaration.
|
||||
static Cl::Kinds ClassifyDecl(ASTContext &Ctx, const Decl *D) {
|
||||
// C++ [expr.prim.general]p6: The result is an lvalue if the entity is a
|
||||
// function, variable, or data member and a prvalue otherwise.
|
||||
// In C, functions are not lvalues.
|
||||
// In addition, NonTypeTemplateParmDecl derives from VarDecl but isn't an
|
||||
// lvalue unless it's a reference type (C++ [temp.param]p6), so we need to
|
||||
// special-case this.
|
||||
bool islvalue;
|
||||
if (const NonTypeTemplateParmDecl *NTTParm =
|
||||
dyn_cast<NonTypeTemplateParmDecl>(D))
|
||||
islvalue = NTTParm->getType()->isReferenceType();
|
||||
else
|
||||
islvalue = isa<VarDecl>(D) || isa<FieldDecl>(D) ||
|
||||
(Ctx.getLangOptions().CPlusPlus &&
|
||||
(isa<FunctionDecl>(D) || isa<FunctionTemplateDecl>(D)));
|
||||
|
||||
return islvalue ? Cl::CL_LValue : Cl::CL_PRValue;
|
||||
}
|
||||
|
||||
/// ClassifyUnnamed - Return the classification of an expression yielding an
|
||||
/// unnamed value of the given type. This applies in particular to function
|
||||
/// calls and casts.
|
||||
static Cl::Kinds ClassifyUnnamed(ASTContext &Ctx, QualType T) {
|
||||
// In C, function calls are always rvalues.
|
||||
if (!Ctx.getLangOptions().CPlusPlus) return Cl::CL_PRValue;
|
||||
|
||||
// C++ [expr.call]p10: A function call is an lvalue if the result type is an
|
||||
// lvalue reference type or an rvalue reference to function type, an xvalue
|
||||
// if the result type is an rvalue refernence to object type, and a prvalue
|
||||
// otherwise.
|
||||
if (T->isLValueReferenceType())
|
||||
return Cl::CL_LValue;
|
||||
const RValueReferenceType *RV = T->getAs<RValueReferenceType>();
|
||||
if (!RV) // Could still be a class temporary, though.
|
||||
return T->isRecordType() ? Cl::CL_ClassTemporary : Cl::CL_PRValue;
|
||||
|
||||
return RV->getPointeeType()->isFunctionType() ? Cl::CL_LValue : Cl::CL_XValue;
|
||||
}
|
||||
|
||||
static Cl::Kinds ClassifyMemberExpr(ASTContext &Ctx, const MemberExpr *E) {
|
||||
// Handle C first, it's easier.
|
||||
if (!Ctx.getLangOptions().CPlusPlus) {
|
||||
// C99 6.5.2.3p3
|
||||
// For dot access, the expression is an lvalue if the first part is. For
|
||||
// arrow access, it always is an lvalue.
|
||||
if (E->isArrow())
|
||||
return Cl::CL_LValue;
|
||||
// ObjC property accesses are not lvalues, but get special treatment.
|
||||
Expr *Base = E->getBase();
|
||||
if (isa<ObjCPropertyRefExpr>(Base) ||
|
||||
isa<ObjCImplicitSetterGetterRefExpr>(Base))
|
||||
return Cl::CL_SubObjCPropertySetting;
|
||||
return ClassifyInternal(Ctx, Base);
|
||||
}
|
||||
|
||||
NamedDecl *Member = E->getMemberDecl();
|
||||
// C++ [expr.ref]p3: E1->E2 is converted to the equivalent form (*(E1)).E2.
|
||||
// C++ [expr.ref]p4: If E2 is declared to have type "reference to T", then
|
||||
// E1.E2 is an lvalue.
|
||||
if (ValueDecl *Value = dyn_cast<ValueDecl>(Member))
|
||||
if (Value->getType()->isReferenceType())
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// Otherwise, one of the following rules applies.
|
||||
// -- If E2 is a static member [...] then E1.E2 is an lvalue.
|
||||
if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord())
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// -- If E2 is a non-static data member [...]. If E1 is an lvalue, then
|
||||
// E1.E2 is an lvalue; if E1 is an xvalue, then E1.E2 is an xvalue;
|
||||
// otherwise, it is a prvalue.
|
||||
if (isa<FieldDecl>(Member)) {
|
||||
// *E1 is an lvalue
|
||||
if (E->isArrow())
|
||||
return Cl::CL_LValue;
|
||||
return ClassifyInternal(Ctx, E->getBase());
|
||||
}
|
||||
|
||||
// -- If E2 is a [...] member function, [...]
|
||||
// -- If it refers to a static member function [...], then E1.E2 is an
|
||||
// lvalue; [...]
|
||||
// -- Otherwise [...] E1.E2 is a prvalue.
|
||||
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member))
|
||||
return Method->isStatic() ? Cl::CL_LValue : Cl::CL_MemberFunction;
|
||||
|
||||
// -- If E2 is a member enumerator [...], the expression E1.E2 is a prvalue.
|
||||
// So is everything else we haven't handled yet.
|
||||
return Cl::CL_PRValue;
|
||||
}
|
||||
|
||||
static Cl::Kinds ClassifyBinaryOp(ASTContext &Ctx, const BinaryOperator *E) {
|
||||
assert(Ctx.getLangOptions().CPlusPlus &&
|
||||
"This is only relevant for C++.");
|
||||
// C++ [expr.ass]p1: All [...] return an lvalue referring to the left operand.
|
||||
if (E->isAssignmentOp())
|
||||
return Cl::CL_LValue;
|
||||
|
||||
// C++ [expr.comma]p1: the result is of the same value category as its right
|
||||
// operand, [...].
|
||||
if (E->getOpcode() == BinaryOperator::Comma)
|
||||
return ClassifyInternal(Ctx, E->getRHS());
|
||||
|
||||
// C++ [expr.mptr.oper]p6: The result of a .* expression whose second operand
|
||||
// is a pointer to a data member is of the same value category as its first
|
||||
// operand.
|
||||
if (E->getOpcode() == BinaryOperator::PtrMemD)
|
||||
return E->getType()->isFunctionType() ? Cl::CL_MemberFunction :
|
||||
ClassifyInternal(Ctx, E->getLHS());
|
||||
|
||||
// C++ [expr.mptr.oper]p6: The result of an ->* expression is an lvalue if its
|
||||
// second operand is a pointer to data member and a prvalue otherwise.
|
||||
if (E->getOpcode() == BinaryOperator::PtrMemI)
|
||||
return E->getType()->isFunctionType() ?
|
||||
Cl::CL_MemberFunction : Cl::CL_LValue;
|
||||
|
||||
// All other binary operations are prvalues.
|
||||
return Cl::CL_PRValue;
|
||||
}
|
||||
|
||||
static Cl::Kinds ClassifyConditional(ASTContext &Ctx,
|
||||
const ConditionalOperator *E) {
|
||||
assert(Ctx.getLangOptions().CPlusPlus &&
|
||||
"This is only relevant for C++.");
|
||||
|
||||
Expr *True = E->getTrueExpr();
|
||||
Expr *False = E->getFalseExpr();
|
||||
// C++ [expr.cond]p2
|
||||
// If either the second or the third operand has type (cv) void, [...]
|
||||
// the result [...] is a prvalue.
|
||||
if (True->getType()->isVoidType() || False->getType()->isVoidType())
|
||||
return Cl::CL_PRValue;
|
||||
|
||||
// Note that at this point, we have already performed all conversions
|
||||
// according to [expr.cond]p3.
|
||||
// C++ [expr.cond]p4: If the second and third operands are glvalues of the
|
||||
// same value category [...], the result is of that [...] value category.
|
||||
// C++ [expr.cond]p5: Otherwise, the result is a prvalue.
|
||||
Cl::Kinds LCl = ClassifyInternal(Ctx, True),
|
||||
RCl = ClassifyInternal(Ctx, False);
|
||||
return LCl == RCl ? LCl : Cl::CL_PRValue;
|
||||
}
|
||||
|
||||
static Cl::ModifiableType IsModifiable(ASTContext &Ctx, const Expr *E,
|
||||
Cl::Kinds Kind, SourceLocation &Loc) {
|
||||
// As a general rule, we only care about lvalues. But there are some rvalues
|
||||
// for which we want to generate special results.
|
||||
if (Kind == Cl::CL_PRValue) {
|
||||
// For the sake of better diagnostics, we want to specifically recognize
|
||||
// use of the GCC cast-as-lvalue extension.
|
||||
if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(E->IgnoreParens())){
|
||||
if (CE->getSubExpr()->Classify(Ctx).isLValue()) {
|
||||
Loc = CE->getLParenLoc();
|
||||
return Cl::CM_LValueCast;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (Kind != Cl::CL_LValue)
|
||||
return Cl::CM_RValue;
|
||||
|
||||
// This is the lvalue case.
|
||||
// Functions are lvalues in C++, but not modifiable. (C++ [basic.lval]p6)
|
||||
if (Ctx.getLangOptions().CPlusPlus && E->getType()->isFunctionType())
|
||||
return Cl::CM_Function;
|
||||
|
||||
// You cannot assign to a variable outside a block from within the block if
|
||||
// it is not marked __block, e.g.
|
||||
// void takeclosure(void (^C)(void));
|
||||
// void func() { int x = 1; takeclosure(^{ x = 7; }); }
|
||||
if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(E)) {
|
||||
if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl()))
|
||||
return Cl::CM_NotBlockQualified;
|
||||
}
|
||||
|
||||
// Assignment to a property in ObjC is an implicit setter access. But a
|
||||
// setter might not exist.
|
||||
if (const ObjCImplicitSetterGetterRefExpr *Expr =
|
||||
dyn_cast<ObjCImplicitSetterGetterRefExpr>(E)) {
|
||||
if (Expr->getSetterMethod() == 0)
|
||||
return Cl::CM_NoSetterProperty;
|
||||
}
|
||||
|
||||
CanQualType CT = Ctx.getCanonicalType(E->getType());
|
||||
// Const stuff is obviously not modifiable.
|
||||
if (CT.isConstQualified())
|
||||
return Cl::CM_ConstQualified;
|
||||
// Arrays are not modifiable, only their elements are.
|
||||
if (CT->isArrayType())
|
||||
return Cl::CM_ArrayType;
|
||||
// Incomplete types are not modifiable.
|
||||
if (CT->isIncompleteType())
|
||||
return Cl::CM_IncompleteType;
|
||||
|
||||
// Records with any const fields (recursively) are not modifiable.
|
||||
if (const RecordType *R = CT->getAs<RecordType>()) {
|
||||
assert(!Ctx.getLangOptions().CPlusPlus &&
|
||||
"C++ struct assignment should be resolved by the "
|
||||
"copy assignment operator.");
|
||||
if (R->hasConstFields())
|
||||
return Cl::CM_ConstQualified;
|
||||
}
|
||||
|
||||
return Cl::CM_Modifiable;
|
||||
}
|
||||
|
||||
Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const {
|
||||
Classification VC = Classify(Ctx);
|
||||
switch (VC.getKind()) {
|
||||
case Cl::CL_LValue: return LV_Valid;
|
||||
case Cl::CL_XValue: return LV_InvalidExpression;
|
||||
case Cl::CL_Function: return LV_NotObjectType;
|
||||
case Cl::CL_Void: return LV_IncompleteVoidType;
|
||||
case Cl::CL_DuplicateVectorComponents: return LV_DuplicateVectorComponents;
|
||||
case Cl::CL_MemberFunction: return LV_MemberFunction;
|
||||
case Cl::CL_SubObjCPropertySetting: return LV_SubObjCPropertySetting;
|
||||
case Cl::CL_ClassTemporary: return LV_ClassTemporary;
|
||||
case Cl::CL_PRValue: return LV_InvalidExpression;
|
||||
}
|
||||
assert(false && "Unhandled kind");
|
||||
}
|
||||
|
||||
Expr::isModifiableLvalueResult
|
||||
Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const {
|
||||
SourceLocation dummy;
|
||||
Classification VC = ClassifyModifiable(Ctx, Loc ? *Loc : dummy);
|
||||
switch (VC.getKind()) {
|
||||
case Cl::CL_LValue: break;
|
||||
case Cl::CL_XValue: return MLV_InvalidExpression;
|
||||
case Cl::CL_Function: return MLV_NotObjectType;
|
||||
case Cl::CL_Void: return MLV_IncompleteVoidType;
|
||||
case Cl::CL_DuplicateVectorComponents: return MLV_DuplicateVectorComponents;
|
||||
case Cl::CL_MemberFunction: return MLV_MemberFunction;
|
||||
case Cl::CL_SubObjCPropertySetting: return MLV_SubObjCPropertySetting;
|
||||
case Cl::CL_ClassTemporary: return MLV_ClassTemporary;
|
||||
case Cl::CL_PRValue:
|
||||
return VC.getModifiable() == Cl::CM_LValueCast ?
|
||||
MLV_LValueCast : MLV_InvalidExpression;
|
||||
}
|
||||
assert(VC.getKind() == Cl::CL_LValue && "Unhandled kind");
|
||||
switch (VC.getModifiable()) {
|
||||
case Cl::CM_Untested: assert(false && "Did not test modifiability");
|
||||
case Cl::CM_Modifiable: return MLV_Valid;
|
||||
case Cl::CM_RValue: assert(false && "CM_RValue and CL_LValue don't match");
|
||||
case Cl::CM_Function: return MLV_NotObjectType;
|
||||
case Cl::CM_LValueCast:
|
||||
assert(false && "CM_LValueCast and CL_LValue don't match");
|
||||
case Cl::CM_NotBlockQualified: return MLV_NotBlockQualified;
|
||||
case Cl::CM_NoSetterProperty: return MLV_NoSetterProperty;
|
||||
case Cl::CM_ConstQualified: return MLV_ConstQualified;
|
||||
case Cl::CM_ArrayType: return MLV_ArrayType;
|
||||
case Cl::CM_IncompleteType: return MLV_IncompleteType;
|
||||
}
|
||||
assert(false && "Unhandled modifiable type");
|
||||
}
|
Loading…
Reference in New Issue