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-rw-r--r--clang/lib/Sema/TreeTransform.h144
1 files changed, 97 insertions, 47 deletions
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 1629138c5b7..820fe65c6c8 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -504,7 +504,8 @@ public:
///
/// Returns true if there was an error.
bool TransformTemplateArgument(const TemplateArgumentLoc &Input,
- TemplateArgumentLoc &Output);
+ TemplateArgumentLoc &Output,
+ bool Uneval = false);
/// \brief Transform the given set of template arguments.
///
@@ -526,8 +527,10 @@ public:
/// Returns true if an error occurred.
bool TransformTemplateArguments(const TemplateArgumentLoc *Inputs,
unsigned NumInputs,
- TemplateArgumentListInfo &Outputs) {
- return TransformTemplateArguments(Inputs, Inputs + NumInputs, Outputs);
+ TemplateArgumentListInfo &Outputs,
+ bool Uneval = false) {
+ return TransformTemplateArguments(Inputs, Inputs + NumInputs, Outputs,
+ Uneval);
}
/// \brief Transform the given set of template arguments.
@@ -547,7 +550,8 @@ public:
template<typename InputIterator>
bool TransformTemplateArguments(InputIterator First,
InputIterator Last,
- TemplateArgumentListInfo &Outputs);
+ TemplateArgumentListInfo &Outputs,
+ bool Uneval = false);
/// \brief Fakes up a TemplateArgumentLoc for a given TemplateArgument.
void InventTemplateArgumentLoc(const TemplateArgument &Arg,
@@ -2615,18 +2619,14 @@ public:
}
/// \brief Build a new expression to compute the length of a parameter pack.
- ExprResult RebuildSizeOfPackExpr(SourceLocation OperatorLoc, NamedDecl *Pack,
+ ExprResult RebuildSizeOfPackExpr(SourceLocation OperatorLoc,
+ NamedDecl *Pack,
SourceLocation PackLoc,
SourceLocation RParenLoc,
- Optional<unsigned> Length) {
- if (Length)
- return new (SemaRef.Context) SizeOfPackExpr(SemaRef.Context.getSizeType(),
- OperatorLoc, Pack, PackLoc,
- RParenLoc, *Length);
-
- return new (SemaRef.Context) SizeOfPackExpr(SemaRef.Context.getSizeType(),
- OperatorLoc, Pack, PackLoc,
- RParenLoc);
+ Optional<unsigned> Length,
+ ArrayRef<TemplateArgument> PartialArgs) {
+ return SizeOfPackExpr::Create(SemaRef.Context, OperatorLoc, Pack, PackLoc,
+ RParenLoc, Length, PartialArgs);
}
/// \brief Build a new Objective-C boxed expression.
@@ -3511,7 +3511,7 @@ void TreeTransform<Derived>::InventTemplateArgumentLoc(
template<typename Derived>
bool TreeTransform<Derived>::TransformTemplateArgument(
const TemplateArgumentLoc &Input,
- TemplateArgumentLoc &Output) {
+ TemplateArgumentLoc &Output, bool Uneval) {
const TemplateArgument &Arg = Input.getArgument();
switch (Arg.getKind()) {
case TemplateArgument::Null:
@@ -3559,8 +3559,8 @@ bool TreeTransform<Derived>::TransformTemplateArgument(
case TemplateArgument::Expression: {
// Template argument expressions are constant expressions.
- EnterExpressionEvaluationContext Unevaluated(getSema(),
- Sema::ConstantEvaluated);
+ EnterExpressionEvaluationContext Unevaluated(
+ getSema(), Uneval ? Sema::Unevaluated : Sema::ConstantEvaluated);
Expr *InputExpr = Input.getSourceExpression();
if (!InputExpr) InputExpr = Input.getArgument().getAsExpr();
@@ -3638,9 +3638,9 @@ public:
template<typename Derived>
template<typename InputIterator>
-bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
- InputIterator Last,
- TemplateArgumentListInfo &Outputs) {
+bool TreeTransform<Derived>::TransformTemplateArguments(
+ InputIterator First, InputIterator Last, TemplateArgumentListInfo &Outputs,
+ bool Uneval) {
for (; First != Last; ++First) {
TemplateArgumentLoc Out;
TemplateArgumentLoc In = *First;
@@ -3658,7 +3658,7 @@ bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
In.getArgument().pack_begin()),
PackLocIterator(*this,
In.getArgument().pack_end()),
- Outputs))
+ Outputs, Uneval))
return true;
continue;
@@ -3696,7 +3696,7 @@ bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
// expansion.
TemplateArgumentLoc OutPattern;
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(getSema(), -1);
- if (getDerived().TransformTemplateArgument(Pattern, OutPattern))
+ if (getDerived().TransformTemplateArgument(Pattern, OutPattern, Uneval))
return true;
Out = getDerived().RebuildPackExpansion(OutPattern, Ellipsis,
@@ -3713,7 +3713,7 @@ bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
for (unsigned I = 0; I != *NumExpansions; ++I) {
Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(getSema(), I);
- if (getDerived().TransformTemplateArgument(Pattern, Out))
+ if (getDerived().TransformTemplateArgument(Pattern, Out, Uneval))
return true;
if (Out.getArgument().containsUnexpandedParameterPack()) {
@@ -3731,7 +3731,7 @@ bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
if (RetainExpansion) {
ForgetPartiallySubstitutedPackRAII Forget(getDerived());
- if (getDerived().TransformTemplateArgument(Pattern, Out))
+ if (getDerived().TransformTemplateArgument(Pattern, Out, Uneval))
return true;
Out = getDerived().RebuildPackExpansion(Out, Ellipsis,
@@ -3746,7 +3746,7 @@ bool TreeTransform<Derived>::TransformTemplateArguments(InputIterator First,
}
// The simple case:
- if (getDerived().TransformTemplateArgument(In, Out))
+ if (getDerived().TransformTemplateArgument(In, Out, Uneval))
return true;
Outputs.addArgument(Out);
@@ -10005,36 +10005,86 @@ TreeTransform<Derived>::TransformSizeOfPackExpr(SizeOfPackExpr *E) {
if (!E->isValueDependent())
return E;
- // Note: None of the implementations of TryExpandParameterPacks can ever
- // produce a diagnostic when given only a single unexpanded parameter pack,
- // so
- UnexpandedParameterPack Unexpanded(E->getPack(), E->getPackLoc());
- bool ShouldExpand = false;
- bool RetainExpansion = false;
- Optional<unsigned> NumExpansions;
- if (getDerived().TryExpandParameterPacks(E->getOperatorLoc(), E->getPackLoc(),
- Unexpanded,
- ShouldExpand, RetainExpansion,
- NumExpansions))
- return ExprError();
+ EnterExpressionEvaluationContext Unevaluated(getSema(), Sema::Unevaluated);
- if (RetainExpansion)
- return E;
+ ArrayRef<TemplateArgument> PackArgs;
+ TemplateArgument ArgStorage;
+
+ // Find the argument list to transform.
+ if (E->isPartiallySubstituted()) {
+ PackArgs = E->getPartialArguments();
+ } else if (E->isValueDependent()) {
+ UnexpandedParameterPack Unexpanded(E->getPack(), E->getPackLoc());
+ bool ShouldExpand = false;
+ bool RetainExpansion = false;
+ Optional<unsigned> NumExpansions;
+ if (getDerived().TryExpandParameterPacks(E->getOperatorLoc(), E->getPackLoc(),
+ Unexpanded,
+ ShouldExpand, RetainExpansion,
+ NumExpansions))
+ return ExprError();
+
+ // If we need to expand the pack, build a template argument from it and
+ // expand that.
+ if (ShouldExpand) {
+ auto *Pack = E->getPack();
+ if (auto *TTPD = dyn_cast<TemplateTypeParmDecl>(Pack)) {
+ ArgStorage = getSema().Context.getPackExpansionType(
+ getSema().Context.getTypeDeclType(TTPD), None);
+ } else if (auto *TTPD = dyn_cast<TemplateTemplateParmDecl>(Pack)) {
+ ArgStorage = TemplateArgument(TemplateName(TTPD), None);
+ } else {
+ auto *VD = cast<ValueDecl>(Pack);
+ ExprResult DRE = getSema().BuildDeclRefExpr(VD, VD->getType(),
+ VK_RValue, E->getPackLoc());
+ if (DRE.isInvalid())
+ return ExprError();
+ ArgStorage = new (getSema().Context) PackExpansionExpr(
+ getSema().Context.DependentTy, DRE.get(), E->getPackLoc(), None);
+ }
+ PackArgs = ArgStorage;
+ }
+ }
- NamedDecl *Pack = E->getPack();
- if (!ShouldExpand) {
- Pack = cast_or_null<NamedDecl>(getDerived().TransformDecl(E->getPackLoc(),
- Pack));
+ // If we're not expanding the pack, just transform the decl.
+ if (!PackArgs.size()) {
+ auto *Pack = cast_or_null<NamedDecl>(
+ getDerived().TransformDecl(E->getPackLoc(), E->getPack()));
if (!Pack)
return ExprError();
+ return getDerived().RebuildSizeOfPackExpr(E->getOperatorLoc(), Pack,
+ E->getPackLoc(),
+ E->getRParenLoc(), None, None);
+ }
+
+ TemplateArgumentListInfo TransformedPackArgs(E->getPackLoc(),
+ E->getPackLoc());
+ {
+ TemporaryBase Rebase(*this, E->getPackLoc(), getBaseEntity());
+ typedef TemplateArgumentLocInventIterator<
+ Derived, const TemplateArgument*> PackLocIterator;
+ if (TransformTemplateArguments(PackLocIterator(*this, PackArgs.begin()),
+ PackLocIterator(*this, PackArgs.end()),
+ TransformedPackArgs, /*Uneval*/true))
+ return ExprError();
+ }
+
+ SmallVector<TemplateArgument, 8> Args;
+ bool PartialSubstitution = false;
+ for (auto &Loc : TransformedPackArgs.arguments()) {
+ Args.push_back(Loc.getArgument());
+ if (Loc.getArgument().isPackExpansion())
+ PartialSubstitution = true;
}
+ if (PartialSubstitution)
+ return getDerived().RebuildSizeOfPackExpr(E->getOperatorLoc(), E->getPack(),
+ E->getPackLoc(),
+ E->getRParenLoc(), None, Args);
- // We now know the length of the parameter pack, so build a new expression
- // that stores that length.
- return getDerived().RebuildSizeOfPackExpr(E->getOperatorLoc(), Pack,
+ return getDerived().RebuildSizeOfPackExpr(E->getOperatorLoc(), E->getPack(),
E->getPackLoc(), E->getRParenLoc(),
- NumExpansions);
+ Args.size(), None);
}
template<typename Derived>
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