[clang][bytecode] Add support for typeid pointers (#121251)

Add it as another kind of pointer, saving both a `Type*` for the result
of the typeid() expression as well as one for the type of the typeid
expression.

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/lib/AST/ByteCode/Pointer.cpp b/clang/lib/AST/ByteCode/Pointer.cpp
index 01e6423..da20259 100644
--- a/clang/lib/AST/ByteCode/Pointer.cpp
+++ b/clang/lib/AST/ByteCode/Pointer.cpp
@@ -96,6 +96,8 @@ void Pointer::operator=(const Pointer &P) {
     PointeeStorage.Int = P.PointeeStorage.Int;
   } else if (P.isFunctionPointer()) {
     PointeeStorage.Fn = P.PointeeStorage.Fn;
+  } else if (P.isTypeidPointer()) {
+    PointeeStorage.Typeid = P.PointeeStorage.Typeid;
   } else {
     assert(false && "Unhandled storage kind");
   }
@@ -132,6 +134,8 @@ void Pointer::operator=(Pointer &&P) {
     PointeeStorage.Int = P.PointeeStorage.Int;
   } else if (P.isFunctionPointer()) {
     PointeeStorage.Fn = P.PointeeStorage.Fn;
+  } else if (P.isTypeidPointer()) {
+    PointeeStorage.Typeid = P.PointeeStorage.Typeid;
   } else {
     assert(false && "Unhandled storage kind");
   }
@@ -151,6 +155,14 @@ APValue Pointer::toAPValue(const ASTContext &ASTCtx) const {
   if (isFunctionPointer())
     return asFunctionPointer().toAPValue(ASTCtx);
 
+  if (isTypeidPointer()) {
+    TypeInfoLValue TypeInfo(PointeeStorage.Typeid.TypePtr);
+    return APValue(
+        APValue::LValueBase::getTypeInfo(
+            TypeInfo, QualType(PointeeStorage.Typeid.TypeInfoType, 0)),
+        CharUnits::Zero(), APValue::NoLValuePath{});
+  }
+
   // Build the lvalue base from the block.
   const Descriptor *Desc = getDeclDesc();
   APValue::LValueBase Base;
@@ -304,6 +316,8 @@ void Pointer::print(llvm::raw_ostream &OS) const {
   case Storage::Fn:
     OS << "(Fn) { " << asFunctionPointer().getFunction() << " + " << Offset
        << " }";
+  case Storage::Typeid:
+    OS << "(Typeid)";
   }
 }
 
@@ -450,6 +464,8 @@ bool Pointer::hasSameBase(const Pointer &A, const Pointer &B) {
     return true;
   if (A.isFunctionPointer() && B.isFunctionPointer())
     return true;
+  if (A.isTypeidPointer() && B.isTypeidPointer())
+    return true;
 
   if (A.isIntegralPointer() || B.isIntegralPointer())
     return A.getSource() == B.getSource();