PODness and Type Traits
Make C++ classes track the POD property (C++ [class]p4)
Track the existence of a copy assignment operator.
Implicitly declare the copy assignment operator if none is provided.
Implement most of the parsing job for the G++ type traits extension.
Fully implement the low-hanging fruit of the type traits:
__is_pod: Whether a type is a POD.
__is_class: Whether a type is a (non-union) class.
__is_union: Whether a type is a union.
__is_enum: Whether a type is an enum.
__is_polymorphic: Whether a type is polymorphic (C++ [class.virtual]p1).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61746 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index c2bbad3..94e686b 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -381,6 +381,8 @@
/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
/// [C++] 'this' [C++ 9.3.2]
+/// [G++] unary-type-trait '(' type-id ')'
+/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
/// [clang] '^' block-literal
///
/// constant: [C99 6.4.4]
@@ -410,6 +412,26 @@
/// '::'[opt] 'delete' cast-expression
/// '::'[opt] 'delete' '[' ']' cast-expression
///
+/// [GNU] unary-type-trait:
+/// '__has_nothrow_assign' [TODO]
+/// '__has_nothrow_copy' [TODO]
+/// '__has_nothrow_constructor' [TODO]
+/// '__has_trivial_assign' [TODO]
+/// '__has_trivial_copy' [TODO]
+/// '__has_trivial_constructor' [TODO]
+/// '__has_trivial_destructor' [TODO]
+/// '__has_virtual_destructor' [TODO]
+/// '__is_abstract' [TODO]
+/// '__is_class'
+/// '__is_empty' [TODO]
+/// '__is_enum'
+/// '__is_pod'
+/// '__is_polymorphic'
+/// '__is_union'
+///
+/// [GNU] binary-type-trait:
+/// '__is_base_of' [TODO]
+///
Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression) {
OwningExprResult Res(Actions);
tok::TokenKind SavedKind = Tok.getKind();
@@ -650,6 +672,13 @@
case tok::kw_delete: // [C++] delete-expression
return ParseCXXDeleteExpression(false, Tok.getLocation());
+ case tok::kw___is_pod: // [GNU] unary-type-trait
+ case tok::kw___is_class:
+ case tok::kw___is_enum:
+ case tok::kw___is_union:
+ case tok::kw___is_polymorphic:
+ return ParseUnaryTypeTrait();
+
case tok::at: {
SourceLocation AtLoc = ConsumeToken();
return ParseObjCAtExpression(AtLoc);
diff --git a/lib/Parse/ParseExprCXX.cpp b/lib/Parse/ParseExprCXX.cpp
index c7c6be9..5731f1f 100644
--- a/lib/Parse/ParseExprCXX.cpp
+++ b/lib/Parse/ParseExprCXX.cpp
@@ -839,3 +839,51 @@
return Owned(Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete,
Operand.release()));
}
+
+static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind)
+{
+ switch(kind) {
+ default: assert(false && "Not a known unary type trait.");
+ case tok::kw___has_nothrow_assign: return UTT_HasNothrowAssign;
+ case tok::kw___has_nothrow_copy: return UTT_HasNothrowCopy;
+ case tok::kw___has_nothrow_constructor: return UTT_HasNothrowConstructor;
+ case tok::kw___has_trivial_assign: return UTT_HasTrivialAssign;
+ case tok::kw___has_trivial_copy: return UTT_HasTrivialCopy;
+ case tok::kw___has_trivial_constructor: return UTT_HasTrivialConstructor;
+ case tok::kw___has_trivial_destructor: return UTT_HasTrivialDestructor;
+ case tok::kw___has_virtual_destructor: return UTT_HasVirtualDestructor;
+ case tok::kw___is_abstract: return UTT_IsAbstract;
+ case tok::kw___is_class: return UTT_IsClass;
+ case tok::kw___is_empty: return UTT_IsEmpty;
+ case tok::kw___is_enum: return UTT_IsEnum;
+ case tok::kw___is_pod: return UTT_IsPOD;
+ case tok::kw___is_polymorphic: return UTT_IsPolymorphic;
+ case tok::kw___is_union: return UTT_IsUnion;
+ }
+}
+
+/// ParseUnaryTypeTrait - Parse the built-in unary type-trait
+/// pseudo-functions that allow implementation of the TR1/C++0x type traits
+/// templates.
+///
+/// primary-expression:
+/// [GNU] unary-type-trait '(' type-id ')'
+///
+Parser::OwningExprResult Parser::ParseUnaryTypeTrait()
+{
+ UnaryTypeTrait UTT = UnaryTypeTraitFromTokKind(Tok.getKind());
+ SourceLocation Loc = ConsumeToken();
+
+ SourceLocation LParen = Tok.getLocation();
+ if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen))
+ return ExprError();
+
+ // FIXME: Error reporting absolutely sucks! If the this fails to parse a type
+ // there will be cryptic errors about mismatched parentheses and missing
+ // specifiers.
+ TypeTy *Ty = ParseTypeName();
+
+ SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen);
+
+ return Actions.ActOnUnaryTypeTrait(UTT, Loc, LParen, Ty, RParen);
+}