maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

t/clang/expr-traits 

Patch authored by David Abrahams.

These two expression traits (__is_lvalue_expr, __is_rvalue_expr) are used for
parsing code that employs certain features of the Embarcadero C++ compiler.

llvm-svn: 130122
This commit is contained in:
John Wiegley 2011-04-25 06:54:41 +00:00
parent 03b77b37d6
commit f9f6584e95
25 changed files with 896 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
clang/include/clang/AST/EvaluatedExprVisitor.h
View File

@ -38,6 +38,7 @@ public:
void VisitDeclRefExpr(DeclRefExpr *E) { }
void VisitOffsetOfExpr(OffsetOfExpr *E) { }
void VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *E) { }
void VisitExpressionTraitExpr(ExpressionTraitExpr *E) { }
void VisitBlockExpr(BlockExpr *E) { }
void VisitCXXUuidofExpr(CXXUuidofExpr *E) { }
void VisitCXXNoexceptExpr(CXXNoexceptExpr *E) { }

53
clang/include/clang/AST/ExprCXX.h
View File

@ -15,6 +15,7 @@
#define LLVM_CLANG_AST_EXPRCXX_H
#include "clang/Basic/TypeTraits.h"
#include "clang/Basic/ExpressionTraits.h"
#include "clang/AST/Expr.h"
#include "clang/AST/UnresolvedSet.h"
#include "clang/AST/TemplateBase.h"
@ -1593,6 +1594,58 @@ public:
friend class ASTStmtReader;
};
/// ExpressionTraitExpr - An expression trait intrinsic
/// Example:
/// __is_lvalue_expr(std::cout) == true
/// __is_lvalue_expr(1) == false
class ExpressionTraitExpr : public Expr {
/// ET - The trait. A ExpressionTrait enum in MSVC compat unsigned.
unsigned ET : 31;
/// The value of the type trait. Unspecified if dependent.
bool Value : 1;
/// Loc - The location of the type trait keyword.
SourceLocation Loc;
/// RParen - The location of the closing paren.
SourceLocation RParen;
Expr* QueriedExpression;
public:
ExpressionTraitExpr(SourceLocation loc, ExpressionTrait et,
Expr *queried, bool value,
SourceLocation rparen, QualType resultType)
: Expr(ExpressionTraitExprClass, resultType, VK_RValue, OK_Ordinary,
false, // Not type-dependent
// Value-dependent if the argument is type-dependent.
queried->isTypeDependent(),
queried->containsUnexpandedParameterPack()),
ET(et), Value(value), Loc(loc), RParen(rparen), QueriedExpression(queried) { }
explicit ExpressionTraitExpr(EmptyShell Empty)
: Expr(ExpressionTraitExprClass, Empty), ET(0), Value(false),
QueriedExpression() { }
SourceRange getSourceRange() const { return SourceRange(Loc, RParen);}
ExpressionTrait getTrait() const { return static_cast<ExpressionTrait>(ET); }
Expr *getQueriedExpression() const { return QueriedExpression; }
bool getValue() const { return Value; }
static bool classof(const Stmt *T) {
return T->getStmtClass() == ExpressionTraitExprClass;
}
static bool classof(const ExpressionTraitExpr *) { return true; }
// Iterators
child_range children() { return child_range(); }
friend class ASTStmtReader;
};
/// \brief A reference to an overloaded function set, either an
/// \t UnresolvedLookupExpr or an \t UnresolvedMemberExpr.
class OverloadExpr : public Expr {

4
clang/include/clang/AST/RecursiveASTVisitor.h
View File

@ -1849,6 +1849,10 @@ DEF_TRAVERSE_STMT(BinaryTypeTraitExpr, {
TRY_TO(TraverseTypeLoc(S->getRhsTypeSourceInfo()->getTypeLoc()));
})
DEF_TRAVERSE_STMT(ExpressionTraitExpr, {
TRY_TO(TraverseStmt(S->getQueriedExpression()));
})
DEF_TRAVERSE_STMT(VAArgExpr, {
// The child-iterator will pick up the expression argument.
TRY_TO(TraverseTypeLoc(S->getWrittenTypeInfo()->getTypeLoc()));

25
clang/include/clang/Basic/ExpressionTraits.h Normal file
View File

@ -0,0 +1,25 @@
//===--- ExpressionTraits.h - C++ Expression Traits Support Enumerations ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines enumerations for expression traits intrinsics.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_EXPRESSIONTRAITS_H
#define LLVM_CLANG_EXPRESSIONTRAITS_H
namespace clang {
enum ExpressionTrait {
ET_IsLValueExpr,
ET_IsRValueExpr
};
}
#endif

1
clang/include/clang/Basic/StmtNodes.td
View File

@ -104,6 +104,7 @@ def CXXDeleteExpr : DStmt<Expr>;
def CXXPseudoDestructorExpr : DStmt<Expr>;
def UnaryTypeTraitExpr : DStmt<Expr>;
def BinaryTypeTraitExpr : DStmt<Expr>;
def ExpressionTraitExpr : DStmt<Expr>;
def DependentScopeDeclRefExpr : DStmt<Expr>;
def CXXConstructExpr : DStmt<Expr>;
def CXXBindTemporaryExpr : DStmt<Expr>;

4
clang/include/clang/Basic/TokenKinds.def
View File

@ -346,6 +346,10 @@ KEYWORD(__is_polymorphic , KEYCXX)
KEYWORD(__is_trivial , KEYCXX)
KEYWORD(__is_union , KEYCXX)
// Embarcadero Expression Traits
KEYWORD(__is_lvalue_expr , KEYCXX)
KEYWORD(__is_rvalue_expr , KEYCXX)
// Apple Extension.
KEYWORD(__private_extern__ , KEYALL)

4
clang/include/clang/Parse/Parser.h
View File

@ -1802,6 +1802,10 @@ private:
ExprResult ParseUnaryTypeTrait();
ExprResult ParseBinaryTypeTrait();
//===--------------------------------------------------------------------===//
// Embarcadero: Expression Traits
ExprResult ParseExpressionTrait();
//===--------------------------------------------------------------------===//
// Preprocessor code-completion pass-through
virtual void CodeCompleteDirective(bool InConditional);

13
clang/include/clang/Sema/Sema.h
View File

@ -27,6 +27,7 @@
#include "clang/Basic/Specifiers.h"
#include "clang/Basic/TemplateKinds.h"
#include "clang/Basic/TypeTraits.h"
#include "clang/Basic/ExpressionTraits.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
@ -2732,6 +2733,18 @@ public:
TypeSourceInfo *RhsT,
SourceLocation RParen);
/// ActOnExpressionTrait - Parsed one of the unary type trait support
/// pseudo-functions.
ExprResult ActOnExpressionTrait(ExpressionTrait OET,
SourceLocation KWLoc,
Expr *Queried,
SourceLocation RParen);
ExprResult BuildExpressionTrait(ExpressionTrait OET,
SourceLocation KWLoc,
Expr *Queried,
SourceLocation RParen);
ExprResult ActOnStartCXXMemberReference(Scope *S,
Expr *Base,
SourceLocation OpLoc,

1
clang/include/clang/Serialization/ASTBitCodes.h
View File

@ -970,6 +970,7 @@ namespace clang {
EXPR_CXX_UNRESOLVED_LOOKUP, // UnresolvedLookupExpr
EXPR_CXX_UNARY_TYPE_TRAIT, // UnaryTypeTraitExpr
EXPR_CXX_EXPRESSION_TRAIT, // ExpressionTraitExpr
EXPR_CXX_NOEXCEPT, // CXXNoexceptExpr
EXPR_OPAQUE_VALUE, // OpaqueValueExpr

1
clang/lib/AST/ExprClassification.cpp
View File

@ -152,6 +152,7 @@ static Cl::Kinds ClassifyInternal(ASTContext &Ctx, const Expr *E) {
case Expr::CXXScalarValueInitExprClass:
case Expr::UnaryTypeTraitExprClass:
case Expr::BinaryTypeTraitExprClass:
case Expr::ExpressionTraitExprClass:
case Expr::ObjCSelectorExprClass:
case Expr::ObjCProtocolExprClass:
case Expr::ObjCStringLiteralClass:

5
clang/lib/AST/ExprConstant.cpp
View File

@ -1061,6 +1061,10 @@ public:
return Success(E->getValue(), E);
}
bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
return Success(E->getValue(), E);
}
bool VisitChooseExpr(const ChooseExpr *E) {
return Visit(E->getChosenSubExpr(Info.Ctx));
}
@ -2875,6 +2879,7 @@ static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
case Expr::CXXScalarValueInitExprClass:
case Expr::UnaryTypeTraitExprClass:
case Expr::BinaryTypeTraitExprClass:
case Expr::ExpressionTraitExprClass:
case Expr::CXXNoexceptExprClass:
return NoDiag();
case Expr::CallExprClass:

1
clang/lib/AST/ItaniumMangle.cpp
View File

@ -1910,6 +1910,7 @@ void CXXNameMangler::mangleExpression(const Expr *E, unsigned Arity) {
case Expr::StmtExprClass:
case Expr::UnaryTypeTraitExprClass:
case Expr::BinaryTypeTraitExprClass:
case Expr::ExpressionTraitExprClass:
case Expr::VAArgExprClass:
case Expr::CXXUuidofExprClass:
case Expr::CXXNoexceptExprClass:

15
clang/lib/AST/StmtPrinter.cpp
View File

@ -1281,6 +1281,15 @@ static const char *getTypeTraitName(BinaryTypeTrait BTT) {
return "";
}
static const char *getExpressionTraitName(ExpressionTrait ET) {
switch (ET) {
default: llvm_unreachable("Unknown expression trait");
case ET_IsLValueExpr: return "__is_lvalue_expr";
case ET_IsRValueExpr: return "__is_rvalue_expr";
}
return "";
}
void StmtPrinter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
OS << getTypeTraitName(E->getTrait()) << "("
<< E->getQueriedType().getAsString(Policy) << ")";
@ -1292,6 +1301,12 @@ void StmtPrinter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
<< E->getRhsType().getAsString(Policy) << ")";
}
void StmtPrinter::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
OS << getExpressionTraitName(E->getTrait()) << "(";
PrintExpr(E->getQueriedExpression());
OS << ")";
}
void StmtPrinter::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
OS << "noexcept(";
PrintExpr(E->getOperand());

6
clang/lib/AST/StmtProfile.cpp
View File

@ -802,6 +802,12 @@ void StmtProfiler::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *S) {
VisitType(S->getRhsType());
}
void StmtProfiler::VisitExpressionTraitExpr(ExpressionTraitExpr *S) {
VisitExpr(S);
ID.AddInteger(S->getTrait());
VisitExpr(S->getQueriedExpression());
}
void
StmtProfiler::VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *S) {
VisitExpr(S);

4
clang/lib/CodeGen/CGExprScalar.cpp
View File

@ -367,6 +367,10 @@ public:
return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
}
Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
}
Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
// C++ [expr.pseudo]p1:
// The result shall only be used as the operand for the function call

8
clang/lib/Parse/ParseExpr.cpp
View File

@ -555,6 +555,10 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
/// [GNU] '__is_base_of'
/// [MS] '__is_convertible_to'
///
/// [Embarcadero] expression-trait:
/// '__is_lvalue_expr'
/// '__is_rvalue_expr'
///
ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
bool isAddressOfOperand,
bool &NotCastExpr,
@ -1021,6 +1025,10 @@ ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
case tok::kw___is_convertible_to:
return ParseBinaryTypeTrait();
case tok::kw___is_lvalue_expr:
case tok::kw___is_rvalue_expr:
return ParseExpressionTrait();
case tok::at: {
SourceLocation AtLoc = ConsumeToken();
return ParseObjCAtExpression(AtLoc);

30
clang/lib/Parse/ParseExprCXX.cpp
View File

@ -1944,6 +1944,14 @@ static BinaryTypeTrait BinaryTypeTraitFromTokKind(tok::TokenKind kind) {
}
}
static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) {
switch(kind) {
default: assert(false && "Not a known unary expression trait.");
case tok::kw___is_lvalue_expr: return ET_IsLValueExpr;
case tok::kw___is_rvalue_expr: return ET_IsRValueExpr;
}
}
/// ParseUnaryTypeTrait - Parse the built-in unary type-trait
/// pseudo-functions that allow implementation of the TR1/C++0x type traits
/// templates.
@ -2009,6 +2017,28 @@ ExprResult Parser::ParseBinaryTypeTrait() {
return Actions.ActOnBinaryTypeTrait(BTT, Loc, LhsTy.get(), RhsTy.get(), RParen);
}
/// ParseExpressionTrait - Parse built-in expression-trait
/// pseudo-functions like __is_lvalue_expr( xxx ).
///
/// primary-expression:
/// [Embarcadero] expression-trait '(' expression ')'
///
ExprResult Parser::ParseExpressionTrait() {
ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind());
SourceLocation Loc = ConsumeToken();
SourceLocation LParen = Tok.getLocation();
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen))
return ExprError();
ExprResult Expr = ParseExpression();
SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen);
return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(), RParen);
}
/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
/// based on the context past the parens.

39
clang/lib/Sema/SemaExprCXX.cpp
View File

@ -2739,6 +2739,45 @@ ExprResult Sema::BuildBinaryTypeTrait(BinaryTypeTrait BTT,
ResultType));
}
ExprResult Sema::ActOnExpressionTrait(ExpressionTrait ET,
SourceLocation KWLoc,
Expr* Queried,
SourceLocation RParen) {
// If error parsing the expression, ignore.
if (!Queried)
return ExprError();
ExprResult Result
= BuildExpressionTrait(ET, KWLoc, Queried, RParen);
return move(Result);
}
ExprResult Sema::BuildExpressionTrait(ExpressionTrait ET,
SourceLocation KWLoc,
Expr* Queried,
SourceLocation RParen) {
if (Queried->isTypeDependent()) {
// Delay type-checking for type-dependent expressions.
} else if (Queried->getType()->isPlaceholderType()) {
ExprResult PE = CheckPlaceholderExpr(Queried);
if (PE.isInvalid()) return ExprError();
return BuildExpressionTrait(ET, KWLoc, PE.take(), RParen);
}
bool Value = false;
switch (ET) {
default: llvm_unreachable("Unknown or unimplemented expression trait");
case ET_IsLValueExpr: Value = Queried->isLValue(); break;
case ET_IsRValueExpr: Value = Queried->isRValue(); break;
}
// C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
return Owned(
new (Context) ExpressionTraitExpr(
KWLoc, ET, Queried, Value, RParen, Context.BoolTy));
}
QualType Sema::CheckPointerToMemberOperands(ExprResult &lex, ExprResult &rex,
ExprValueKind &VK,
SourceLocation Loc,

29
clang/lib/Sema/TreeTransform.h
View File

@ -1915,6 +1915,17 @@ public:
return getSema().BuildBinaryTypeTrait(Trait, StartLoc, LhsT, RhsT, RParenLoc);
}
/// \brief Build a new expression trait expression.
///
/// By default, performs semantic analysis to build the new expression.
/// Subclasses may override this routine to provide different behavior.
ExprResult RebuildExpressionTrait(ExpressionTrait Trait,
SourceLocation StartLoc,
Expr *Queried,
SourceLocation RParenLoc) {
return getSema().BuildExpressionTrait(Trait, StartLoc, Queried, RParenLoc);
}
/// \brief Build a new (previously unresolved) declaration reference
/// expression.
///
@ -6909,6 +6920,24 @@ TreeTransform<Derived>::TransformBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
E->getLocEnd());
}
template<typename Derived>
ExprResult
TreeTransform<Derived>::TransformExpressionTraitExpr(ExpressionTraitExpr *E) {
ExprResult SubExpr;
{
EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated);
SubExpr = getDerived().TransformExpr(E->getQueriedExpression());
if (SubExpr.isInvalid())
return ExprError();
if (!getDerived().AlwaysRebuild() && SubExpr.get() == E->getQueriedExpression())
return SemaRef.Owned(E);
}
return getDerived().RebuildExpressionTrait(
E->getTrait(), E->getLocStart(), SubExpr.get(), E->getLocEnd());
}
template<typename Derived>
ExprResult
TreeTransform<Derived>::TransformDependentScopeDeclRefExpr(

15
clang/lib/Serialization/ASTReaderStmt.cpp
View File

@ -179,6 +179,7 @@ namespace clang {
void VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
void VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E);
void VisitExpressionTraitExpr(ExpressionTraitExpr *E);
void VisitCXXNoexceptExpr(CXXNoexceptExpr *E);
void VisitPackExpansionExpr(PackExpansionExpr *E);
void VisitSizeOfPackExpr(SizeOfPackExpr *E);
@ -1343,6 +1344,16 @@ void ASTStmtReader::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
E->RhsType = GetTypeSourceInfo(Record, Idx);
}
void ASTStmtReader::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
VisitExpr(E);
E->ET = (ExpressionTrait)Record[Idx++];
E->Value = (bool)Record[Idx++];
SourceRange Range = ReadSourceRange(Record, Idx);
E->QueriedExpression = Reader.ReadSubExpr();
E->Loc = Range.getBegin();
E->RParen = Range.getEnd();
}
void ASTStmtReader::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
VisitExpr(E);
E->Value = (bool)Record[Idx++];
@ -1935,6 +1946,10 @@ Stmt *ASTReader::ReadStmtFromStream(PerFileData &F) {
S = new (Context) BinaryTypeTraitExpr(Empty);
break;
case EXPR_CXX_EXPRESSION_TRAIT:
S = new (Context) ExpressionTraitExpr(Empty);
break;
case EXPR_CXX_NOEXCEPT:
S = new (Context) CXXNoexceptExpr(Empty);
break;

10
clang/lib/Serialization/ASTWriterStmt.cpp
View File

@ -153,6 +153,7 @@ namespace clang {
void VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
void VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E);
void VisitExpressionTraitExpr(ExpressionTraitExpr *E);
void VisitCXXNoexceptExpr(CXXNoexceptExpr *E);
void VisitPackExpansionExpr(PackExpansionExpr *E);
void VisitSizeOfPackExpr(SizeOfPackExpr *E);
@ -1339,6 +1340,15 @@ void ASTStmtWriter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
Code = serialization::EXPR_BINARY_TYPE_TRAIT;
}
void ASTStmtWriter::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
VisitExpr(E);
Record.push_back(E->getTrait());
Record.push_back(E->getValue());
Writer.AddSourceRange(E->getSourceRange(), Record);
Writer.AddStmt(E->getQueriedExpression());
Code = serialization::EXPR_CXX_EXPRESSION_TRAIT;
}
void ASTStmtWriter::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
VisitExpr(E);
Record.push_back(E->getValue());

1
clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
View File

@ -435,6 +435,7 @@ void ExprEngine::Visit(const Stmt* S, ExplodedNode* Pred,
case Stmt::DependentScopeDeclRefExprClass:
case Stmt::UnaryTypeTraitExprClass:
case Stmt::BinaryTypeTraitExprClass:
case Stmt::ExpressionTraitExprClass:
case Stmt::UnresolvedLookupExprClass:
case Stmt::UnresolvedMemberExprClass:
case Stmt::CXXNoexceptExprClass:

620
clang/test/SemaCXX/expression-traits.cpp Normal file
View File

@ -0,0 +1,620 @@
// RUN: %clang_cc1 -fsyntax-only -verify -fcxx-exceptions %s
//
// Tests for "expression traits" intrinsics such as __is_lvalue_expr.
//
// For the time being, these tests are written against the 2003 C++
// standard (ISO/IEC 14882:2003 -- see draft at
// http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2001/n1316/).
//
// C++0x has its own, more-refined, idea of lvalues and rvalues.
// If/when we need to support those, we'll need to track both
// standard documents.
#if !__has_feature(cxx_static_assert)
# define CONCAT_(X_, Y_) CONCAT1_(X_, Y_)
# define CONCAT1_(X_, Y_) X_ ## Y_
// This emulation can be used multiple times on one line (and thus in
// a macro), except at class scope
# define static_assert(b_, m_) \
typedef int CONCAT_(sa_, __LINE__)[b_ ? 1 : -1]
#endif
// Tests are broken down according to section of the C++03 standard
// (ISO/IEC 14882:2003(E))
// Assertion macros encoding the following two paragraphs
//
// basic.lval/1 Every expression is either an lvalue or an rvalue.
//
// expr.prim/5 A parenthesized expression is a primary expression whose type
// and value are identical to those of the enclosed expression. The
// presence of parentheses does not affect whether the expression is
// an lvalue.
//
// Note: these asserts cannot be made at class scope in C++03. Put
// them in a member function instead.
#define ASSERT_LVALUE(expr) \
static_assert(__is_lvalue_expr(expr), "should be an lvalue"); \
static_assert(__is_lvalue_expr((expr)), \
"the presence of parentheses should have" \
" no effect on lvalueness (expr.prim/5)"); \
static_assert(!__is_rvalue_expr(expr), "should be an lvalue"); \
static_assert(!__is_rvalue_expr((expr)), \
"the presence of parentheses should have" \
" no effect on lvalueness (expr.prim/5)")
#define ASSERT_RVALUE(expr); \
static_assert(__is_rvalue_expr(expr), "should be an rvalue"); \
static_assert(__is_rvalue_expr((expr)), \
"the presence of parentheses should have" \
" no effect on lvalueness (expr.prim/5)"); \
static_assert(!__is_lvalue_expr(expr), "should be an rvalue"); \
static_assert(!__is_lvalue_expr((expr)), \
"the presence of parentheses should have" \
" no effect on lvalueness (expr.prim/5)")
enum Enum { Enumerator };
int ReturnInt();
void ReturnVoid();
Enum ReturnEnum();
void basic_lval_5()
{
// basic.lval/5: The result of calling a function that does not return
// a reference is an rvalue.
ASSERT_RVALUE(ReturnInt());
ASSERT_RVALUE(ReturnVoid());
ASSERT_RVALUE(ReturnEnum());
}
int& ReturnIntReference();
extern Enum& ReturnEnumReference();
void basic_lval_6()
{
// basic.lval/6: An expression which holds a temporary object resulting
// from a cast to a nonreference type is an rvalue (this includes
// the explicit creation of an object using functional notation
struct IntClass
{
explicit IntClass(int = 0);
IntClass(char const*);
operator int() const;
};
struct ConvertibleToIntClass
{
operator IntClass() const;
};
ConvertibleToIntClass b;
// Make sure even trivial conversions are not detected as lvalues
int intLvalue = 0;
ASSERT_RVALUE((int)intLvalue);
ASSERT_RVALUE((short)intLvalue);
ASSERT_RVALUE((long)intLvalue);
// Same tests with function-call notation
ASSERT_RVALUE(int(intLvalue));
ASSERT_RVALUE(short(intLvalue));
ASSERT_RVALUE(long(intLvalue));
char charLValue = 'x';
ASSERT_RVALUE((signed char)charLValue);
ASSERT_RVALUE((unsigned char)charLValue);
ASSERT_RVALUE(static_cast<int>(IntClass()));
IntClass intClassLValue;
ASSERT_RVALUE(static_cast<int>(intClassLValue));
ASSERT_RVALUE(static_cast<IntClass>(ConvertibleToIntClass()));
ConvertibleToIntClass convertibleToIntClassLValue;
ASSERT_RVALUE(static_cast<IntClass>(convertibleToIntClassLValue));
typedef signed char signed_char;
typedef unsigned char unsigned_char;
ASSERT_RVALUE(signed_char(charLValue));
ASSERT_RVALUE(unsigned_char(charLValue));
ASSERT_RVALUE(int(IntClass()));
ASSERT_RVALUE(int(intClassLValue));
ASSERT_RVALUE(IntClass(ConvertibleToIntClass()));
ASSERT_RVALUE(IntClass(convertibleToIntClassLValue));
}
void conv_ptr_1()
{
// conv.ptr/1: A null pointer constant is an integral constant
// expression (5.19) rvalue of integer type that evaluates to
// zero.
ASSERT_RVALUE(0);
}
void expr_6()
{
// expr/6: If an expression initially has the type “reference to T”
// (8.3.2, 8.5.3), ... the expression is an lvalue.
int x = 0;
int& referenceToInt = x;
ASSERT_LVALUE(referenceToInt);
ASSERT_LVALUE(ReturnIntReference());
}
void expr_prim_2()
{
// 5.1/2 A string literal is an lvalue; all other
// literals are rvalues.
ASSERT_LVALUE("foo");
ASSERT_RVALUE(1);
ASSERT_RVALUE(1.2);
ASSERT_RVALUE(10UL);
}
void expr_prim_3()
{
// 5.1/3: The keyword "this" names a pointer to the object for
// which a nonstatic member function (9.3.2) is invoked. ...The
// expression is an rvalue.
struct ThisTest
{
void f() { ASSERT_RVALUE(this); }
};
}
extern int variable;
void Function();
struct BaseClass
{
virtual ~BaseClass();
int BaseNonstaticMemberFunction();
static int BaseStaticMemberFunction();
int baseDataMember;
};
struct Class : BaseClass
{
static void function();
static int variable;
template <class T>
struct NestedClassTemplate {};
template <class T>
static int& NestedFuncTemplate() { return variable; } // expected-note{{candidate function}}
template <class T>
int& NestedMemfunTemplate() { return variable; } // expected-note{{candidate function}}
int operator*() const;
template <class T>
int operator+(T) const; // expected-note{{candidate function}}
int NonstaticMemberFunction();
static int StaticMemberFunction();
int dataMember;
int& referenceDataMember;
static int& staticReferenceDataMember;
static int staticNonreferenceDataMember;
enum Enum { Enumerator };
operator long() const;
Class();
Class(int,int);
void expr_prim_4()
{
// 5.1/4: The operator :: followed by an identifier, a
// qualified-id, or an operator-function-id is a primary-
// expression. ...The result is an lvalue if the entity is
// a function or variable.
ASSERT_LVALUE(::Function); // identifier: function
ASSERT_LVALUE(::variable); // identifier: variable
// the only qualified-id form that can start without "::" (and thus
// be legal after "::" ) is
//
// ::<sub>opt</sub> nested-name-specifier template<sub>opt</sub> unqualified-id
ASSERT_LVALUE(::Class::function); // qualified-id: function
ASSERT_LVALUE(::Class::variable); // qualified-id: variable
// The standard doesn't give a clear answer about whether these
// should really be lvalues or rvalues without some surrounding
// context that forces them to be interpreted as naming a
// particular function template specialization (that situation
// doesn't come up in legal pure C++ programs). This language
// extension simply rejects them as requiring additional context
__is_lvalue_expr(::Class::NestedFuncTemplate); // qualified-id: template \
// expected-error{{cannot resolve overloaded function 'NestedFuncTemplate' from context}}
__is_lvalue_expr(::Class::NestedMemfunTemplate); // qualified-id: template \
// expected-error{{cannot resolve overloaded function 'NestedMemfunTemplate' from context}}
__is_lvalue_expr(::Class::operator+); // operator-function-id: template \
// expected-error{{cannot resolve overloaded function 'operator+' from context}}
ASSERT_RVALUE(::Class::operator*); // operator-function-id: member function
}
void expr_prim_7()
{
// expr.prim/7 An identifier is an id-expression provided it has been
// suitably declared (clause 7). [Note: ... ] The type of the
// expression is the type of the identifier. The result is the
// entity denoted by the identifier. The result is an lvalue if
// the entity is a function, variable, or data member... (cont'd)
ASSERT_LVALUE(Function); // identifier: function
ASSERT_LVALUE(StaticMemberFunction); // identifier: function
ASSERT_LVALUE(variable); // identifier: variable
ASSERT_LVALUE(dataMember); // identifier: data member
ASSERT_RVALUE(NonstaticMemberFunction); // identifier: member function
// (cont'd)...A nested-name-specifier that names a class,
// optionally followed by the keyword template (14.2), and then
// followed by the name of a member of either that class (9.2) or
// one of its base classes... is a qualified-id... The result is
// the member. The type of the result is the type of the
// member. The result is an lvalue if the member is a static
// member function or a data member.
ASSERT_LVALUE(Class::dataMember);
ASSERT_LVALUE(Class::StaticMemberFunction);
ASSERT_RVALUE(Class::NonstaticMemberFunction); // identifier: member function
ASSERT_LVALUE(Class::baseDataMember);
ASSERT_LVALUE(Class::BaseStaticMemberFunction);
ASSERT_RVALUE(Class::BaseNonstaticMemberFunction); // identifier: member function
}
};
void expr_call_10()
{
// expr.call/10: A function call is an lvalue if and only if the
// result type is a reference. This statement is partially
// redundant with basic.lval/5
basic_lval_5();
ASSERT_LVALUE(ReturnIntReference());
ASSERT_LVALUE(ReturnEnumReference());
}
namespace Namespace
{
int x;
void function();
}
void expr_prim_8()
{
// expr.prim/8 A nested-name-specifier that names a namespace
// (7.3), followed by the name of a member of that namespace (or
// the name of a member of a namespace made visible by a
// using-directive ) is a qualified-id; 3.4.3.2 describes name
// lookup for namespace members that appear in qualified-ids. The
// result is the member. The type of the result is the type of the
// member. The result is an lvalue if the member is a function or
// a variable.
ASSERT_LVALUE(Namespace::x);
ASSERT_LVALUE(Namespace::function);
}
void expr_sub_1(int* pointer)
{
// expr.sub/1 A postfix expression followed by an expression in
// square brackets is a postfix expression. One of the expressions
// shall have the type “pointer to T” and the other shall have
// enumeration or integral type. The result is an lvalue of type
// “T.”
ASSERT_LVALUE(pointer[1]);
// The expression E1[E2] is identical (by definition) to *((E1)+(E2)).
ASSERT_LVALUE(*(pointer+1));
}
void expr_type_conv_1()
{
// expr.type.conv/1 A simple-type-specifier (7.1.5) followed by a
// parenthesized expression-list constructs a value of the specified
// type given the expression list. ... If the expression list
// specifies more than a single value, the type shall be a class with
// a suitably declared constructor (8.5, 12.1), and the expression
// T(x1, x2, ...) is equivalent in effect to the declaration T t(x1,
// x2, ...); for some invented temporary variable t, with the result
// being the value of t as an rvalue.
ASSERT_RVALUE(Class(2,2));
}
void expr_type_conv_2()
{
// expr.type.conv/2 The expression T(), where T is a
// simple-type-specifier (7.1.5.2) for a non-array complete object
// type or the (possibly cv-qualified) void type, creates an
// rvalue of the specified type,
ASSERT_RVALUE(int());
ASSERT_RVALUE(Class());
ASSERT_RVALUE(void());
}
void expr_ref_4()
{
// Applies to expressions of the form E1.E2
// If E2 is declared to have type “reference to T”, then E1.E2 is
// an lvalue;.... Otherwise, one of the following rules applies.
ASSERT_LVALUE(Class().staticReferenceDataMember);
ASSERT_LVALUE(Class().referenceDataMember);
// — If E2 is a static data member, and the type of E2 is T, then
// E1.E2 is an lvalue; ...
ASSERT_LVALUE(Class().staticNonreferenceDataMember);
ASSERT_LVALUE(Class().staticReferenceDataMember);
// — If E2 is a non-static data member, ... If E1 is an lvalue,
// then E1.E2 is an lvalue...
Class lvalue;
ASSERT_LVALUE(lvalue.dataMember);
ASSERT_RVALUE(Class().dataMember);
// — If E1.E2 refers to a static member function, ... then E1.E2
// is an lvalue
ASSERT_LVALUE(Class().StaticMemberFunction);
// — Otherwise, if E1.E2 refers to a non-static member function,
// then E1.E2 is not an lvalue.
ASSERT_RVALUE(Class().NonstaticMemberFunction);
// — If E2 is a member enumerator, and the type of E2 is T, the
// expression E1.E2 is not an lvalue. The type of E1.E2 is T.
ASSERT_RVALUE(Class().Enumerator);
ASSERT_RVALUE(lvalue.Enumerator);
}
void expr_post_incr_1(int x)
{
// expr.post.incr/1 The value obtained by applying a postfix ++ is
// the value that the operand had before applying the
// operator... The result is an rvalue.
ASSERT_RVALUE(x++);
}
void expr_dynamic_cast_2()
{
// expr.dynamic.cast/2: If T is a pointer type, v shall be an
// rvalue of a pointer to complete class type, and the result is
// an rvalue of type T.
Class instance;
ASSERT_RVALUE(dynamic_cast<Class*>(&instance));
// If T is a reference type, v shall be an
// lvalue of a complete class type, and the result is an lvalue of
// the type referred to by T.
ASSERT_LVALUE(dynamic_cast<Class&>(instance));
}
void expr_dynamic_cast_5()
{
// expr.dynamic.cast/5: If T is “reference to cv1 B” and v has type
// “cv2 D” such that B is a base class of D, the result is an
// lvalue for the unique B sub-object of the D object referred
// to by v.
typedef BaseClass B;
typedef Class D;
D object;
ASSERT_LVALUE(dynamic_cast<B&>(object));
}
// expr.dynamic.cast/8: The run-time check logically executes as follows:
//
// — If, in the most derived object pointed (referred) to by v, v
// points (refers) to a public base class subobject of a T object, and
// if only one object of type T is derived from the sub-object pointed
// (referred) to by v, the result is a pointer (an lvalue referring)
// to that T object.
//
// — Otherwise, if v points (refers) to a public base class sub-object
// of the most derived object, and the type of the most derived object
// has a base class, of type T, that is unambiguous and public, the
// result is a pointer (an lvalue referring) to the T sub-object of
// the most derived object.
//
// The mention of "lvalue" in the text above appears to be a
// defect that is being corrected by the response to UK65 (see
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2841.html).
#if 0
void expr_typeid_1()
{
// expr.typeid/1: The result of a typeid expression is an lvalue...
ASSERT_LVALUE(typeid(1));
}
#endif
void expr_static_cast_1(int x)
{
// expr.static.cast/1: The result of the expression
// static_cast<T>(v) is the result of converting the expression v
// to type T. If T is a reference type, the result is an lvalue;
// otherwise, the result is an rvalue.
ASSERT_LVALUE(static_cast<int&>(x));
ASSERT_RVALUE(static_cast<int>(x));
}
void expr_reinterpret_cast_1()
{
// expr.reinterpret.cast/1: The result of the expression
// reinterpret_cast<T>(v) is the result of converting the
// expression v to type T. If T is a reference type, the result is
// an lvalue; otherwise, the result is an rvalue
ASSERT_RVALUE(reinterpret_cast<int*>(0));
char const v = 0;
ASSERT_LVALUE(reinterpret_cast<char const&>(v));
}
void expr_unary_op_1(int* pointer, struct incomplete* pointerToIncompleteType)
{
// expr.unary.op/1: The unary * operator performs indirection: the
// expression to which it is applied shall be a pointer to an
// object type, or a pointer to a function type and the result is
// an lvalue referring to the object or function to which the
// expression points.
ASSERT_LVALUE(*pointer);
ASSERT_LVALUE(*Function);
// [Note: a pointer to an incomplete type
// (other than cv void ) can be dereferenced. ]
ASSERT_LVALUE(*pointerToIncompleteType);
}
void expr_pre_incr_1(int operand)
{
// expr.pre.incr/1: The operand of prefix ++ ... shall be a
// modifiable lvalue.... The value is the new value of the
// operand; it is an lvalue.
ASSERT_LVALUE(++operand);
}
void expr_cast_1(int x)
{
// expr.cast/1: The result of the expression (T) cast-expression
// is of type T. The result is an lvalue if T is a reference type,
// otherwise the result is an rvalue.
ASSERT_LVALUE((void(&)())expr_cast_1);
ASSERT_LVALUE((int&)x);
ASSERT_RVALUE((void(*)())expr_cast_1);
ASSERT_RVALUE((int)x);
}
void expr_mptr_oper()
{
// expr.mptr.oper/6: The result of a .* expression is an lvalue
// only if its first operand is an lvalue and its second operand
// is a pointer to data member... (cont'd)
typedef Class MakeRValue;
ASSERT_RVALUE(MakeRValue().*(&Class::dataMember));
ASSERT_RVALUE(MakeRValue().*(&Class::NonstaticMemberFunction));
Class lvalue;
ASSERT_LVALUE(lvalue.*(&Class::dataMember));
ASSERT_RVALUE(lvalue.*(&Class::NonstaticMemberFunction));
// (cont'd)...The result of an ->* expression is an lvalue only
// if its second operand is a pointer to data member. If the
// second operand is the null pointer to member value (4.11), the
// behavior is undefined.
ASSERT_LVALUE((&lvalue)->*(&Class::dataMember));
ASSERT_RVALUE((&lvalue)->*(&Class::NonstaticMemberFunction));
}
void expr_cond(bool cond)
{
// 5.16 Conditional operator [expr.cond]
//
// 2 If either the second or the third operand has type (possibly
// cv-qualified) void, then the lvalue-to-rvalue (4.1),
// array-to-pointer (4.2), and function-to-pointer (4.3) standard
// conversions are performed on the second and third operands, and one
// of the following shall hold:
//
// — The second or the third operand (but not both) is a
// throw-expression (15.1); the result is of the type of the other and
// is an rvalue.
Class classLvalue;
ASSERT_RVALUE(cond ? throw 1 : (void)0);
ASSERT_RVALUE(cond ? (void)0 : throw 1);
ASSERT_RVALUE(cond ? throw 1 : classLvalue);
ASSERT_RVALUE(cond ? classLvalue : throw 1);
// — Both the second and the third operands have type void; the result
// is of type void and is an rvalue. [Note: this includes the case
// where both operands are throw-expressions. ]
ASSERT_RVALUE(cond ? (void)1 : (void)0);
ASSERT_RVALUE(cond ? throw 1 : throw 0);
// expr.cond/4: If the second and third operands are lvalues and
// have the same type, the result is of that type and is an
// lvalue.
ASSERT_LVALUE(cond ? classLvalue : classLvalue);
int intLvalue = 0;
ASSERT_LVALUE(cond ? intLvalue : intLvalue);
// expr.cond/5:Otherwise, the result is an rvalue.
typedef Class MakeRValue;
ASSERT_RVALUE(cond ? MakeRValue() : classLvalue);
ASSERT_RVALUE(cond ? classLvalue : MakeRValue());
ASSERT_RVALUE(cond ? MakeRValue() : MakeRValue());
ASSERT_RVALUE(cond ? classLvalue : intLvalue);
ASSERT_RVALUE(cond ? intLvalue : int());
}
void expr_ass_1(int x)
{
// expr.ass/1: There are several assignment operators, all of
// which group right-to-left. All require a modifiable lvalue as
// their left operand, and the type of an assignment expression is
// that of its left operand. The result of the assignment
// operation is the value stored in the left operand after the
// assignment has taken place; the result is an lvalue.
ASSERT_LVALUE(x = 1);
ASSERT_LVALUE(x += 1);
ASSERT_LVALUE(x -= 1);
ASSERT_LVALUE(x *= 1);
ASSERT_LVALUE(x /= 1);
ASSERT_LVALUE(x %= 1);
ASSERT_LVALUE(x ^= 1);
ASSERT_LVALUE(x &= 1);
ASSERT_LVALUE(x |= 1);
}
void expr_comma(int x)
{
// expr.comma: A pair of expressions separated by a comma is
// evaluated left-to-right and the value of the left expression is
// discarded... result is an lvalue if its right operand is.
// Can't use the ASSERT_XXXX macros without adding parens around
// the comma expression.
static_assert(__is_lvalue_expr(x,x), "expected an lvalue");
static_assert(__is_rvalue_expr(x,1), "expected an rvalue");
static_assert(__is_lvalue_expr(1,x), "expected an lvalue");
static_assert(__is_rvalue_expr(1,1), "expected an rvalue");
}
#if 0
template<typename T> void f();
// FIXME These currently fail
void expr_fun_lvalue()
{
ASSERT_LVALUE(&f<int>);
}
void expr_fun_rvalue()
{
ASSERT_RVALUE(f<int>);
}
#endif
template <int NonTypeNonReferenceParameter, int& NonTypeReferenceParameter>
void check_temp_param_6()
{
ASSERT_RVALUE(NonTypeNonReferenceParameter);
ASSERT_LVALUE(NonTypeReferenceParameter);
}
int AnInt = 0;
void temp_param_6()
{
check_temp_param_6<3,AnInt>();
}

5
clang/tools/libclang/CIndex.cpp
View File

@ -1789,6 +1789,7 @@ public:
void VisitWhileStmt(WhileStmt *W);
void VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E);
void VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E);
void VisitExpressionTraitExpr(ExpressionTraitExpr *E);
void VisitUnresolvedMemberExpr(UnresolvedMemberExpr *U);
void VisitVAArgExpr(VAArgExpr *E);
void VisitSizeOfPackExpr(SizeOfPackExpr *E);
@ -2077,6 +2078,10 @@ void EnqueueVisitor::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
AddTypeLoc(E->getLhsTypeSourceInfo());
}
void EnqueueVisitor::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
EnqueueChildren(E);
}
void EnqueueVisitor::VisitUnresolvedMemberExpr(UnresolvedMemberExpr *U) {
VisitOverloadExpr(U);
if (!U->isImplicitAccess())

1
clang/tools/libclang/CXCursor.cpp
View File

@ -151,6 +151,7 @@ CXCursor cxcursor::MakeCXCursor(Stmt *S, Decl *Parent,
case Stmt::UnresolvedLookupExprClass:
case Stmt::UnaryTypeTraitExprClass:
case Stmt::BinaryTypeTraitExprClass:
case Stmt::ExpressionTraitExprClass:
case Stmt::DependentScopeDeclRefExprClass:
case Stmt::CXXBindTemporaryExprClass:
case Stmt::ExprWithCleanupsClass: