[c++20] Implement P1009R2: allow omitting the array bound in an array
new expression.
This was voted into C++20 as a defect report resolution, so we
retroactively apply it to all prior language modes (though it can never
actually be used before C++11 mode).
llvm-svn: 360006
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 004c466..1ab99be 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -175,6 +175,14 @@
return Importer.Import_New(From);
}
+ // Import an Optional<T> by importing the contained T, if any.
+ template<typename T>
+ Expected<Optional<T>> import(Optional<T> From) {
+ if (!From)
+ return Optional<T>();
+ return import(*From);
+ }
+
template <class T>
Expected<std::tuple<T>>
importSeq(const T &From) {
@@ -6896,7 +6904,8 @@
FunctionDecl *ToOperatorNew, *ToOperatorDelete;
SourceRange ToTypeIdParens, ToSourceRange, ToDirectInitRange;
- Expr *ToArraySize, *ToInitializer;
+ Optional<Expr *> ToArraySize;
+ Expr *ToInitializer;
QualType ToType;
TypeSourceInfo *ToAllocatedTypeSourceInfo;
std::tie(
diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
index b1ce167..bbf7e04 100644
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -97,7 +97,8 @@
FunctionDecl *OperatorDelete, bool ShouldPassAlignment,
bool UsualArrayDeleteWantsSize,
ArrayRef<Expr *> PlacementArgs, SourceRange TypeIdParens,
- Expr *ArraySize, InitializationStyle InitializationStyle,
+ Optional<Expr *> ArraySize,
+ InitializationStyle InitializationStyle,
Expr *Initializer, QualType Ty,
TypeSourceInfo *AllocatedTypeInfo, SourceRange Range,
SourceRange DirectInitRange)
@@ -112,7 +113,7 @@
"Only NoInit can have no initializer!");
CXXNewExprBits.IsGlobalNew = IsGlobalNew;
- CXXNewExprBits.IsArray = ArraySize != nullptr;
+ CXXNewExprBits.IsArray = ArraySize.hasValue();
CXXNewExprBits.ShouldPassAlignment = ShouldPassAlignment;
CXXNewExprBits.UsualArrayDeleteWantsSize = UsualArrayDeleteWantsSize;
CXXNewExprBits.StoredInitializationStyle =
@@ -122,12 +123,14 @@
CXXNewExprBits.NumPlacementArgs = PlacementArgs.size();
if (ArraySize) {
- if (ArraySize->isInstantiationDependent())
- ExprBits.InstantiationDependent = true;
- if (ArraySize->containsUnexpandedParameterPack())
- ExprBits.ContainsUnexpandedParameterPack = true;
+ if (Expr *SizeExpr = *ArraySize) {
+ if (SizeExpr->isInstantiationDependent())
+ ExprBits.InstantiationDependent = true;
+ if (SizeExpr->containsUnexpandedParameterPack())
+ ExprBits.ContainsUnexpandedParameterPack = true;
+ }
- getTrailingObjects<Stmt *>()[arraySizeOffset()] = ArraySize;
+ getTrailingObjects<Stmt *>()[arraySizeOffset()] = *ArraySize;
}
if (Initializer) {
@@ -179,11 +182,11 @@
FunctionDecl *OperatorNew, FunctionDecl *OperatorDelete,
bool ShouldPassAlignment, bool UsualArrayDeleteWantsSize,
ArrayRef<Expr *> PlacementArgs, SourceRange TypeIdParens,
- Expr *ArraySize, InitializationStyle InitializationStyle,
- Expr *Initializer, QualType Ty,
- TypeSourceInfo *AllocatedTypeInfo, SourceRange Range,
- SourceRange DirectInitRange) {
- bool IsArray = ArraySize != nullptr;
+ Optional<Expr *> ArraySize,
+ InitializationStyle InitializationStyle, Expr *Initializer,
+ QualType Ty, TypeSourceInfo *AllocatedTypeInfo,
+ SourceRange Range, SourceRange DirectInitRange) {
+ bool IsArray = ArraySize.hasValue();
bool HasInit = Initializer != nullptr;
unsigned NumPlacementArgs = PlacementArgs.size();
bool IsParenTypeId = TypeIdParens.isValid();
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 38eb344..012bd4a 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -1976,10 +1976,11 @@
if (E->isParenTypeId())
OS << "(";
std::string TypeS;
- if (Expr *Size = E->getArraySize()) {
+ if (Optional<Expr *> Size = E->getArraySize()) {
llvm::raw_string_ostream s(TypeS);
s << '[';
- Size->printPretty(s, Helper, Policy);
+ if (*Size)
+ (*Size)->printPretty(s, Helper, Policy);
s << ']';
}
E->getAllocatedType().print(OS, Policy, TypeS);