From 33e01a90452d44bf8a3fe32ef9fc7cd7990141a2 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Fri, 25 Jun 2021 20:55:09 +0200
Subject: [PATCH] [IR] Add Type::isOpaquePointerTy() helper (NFC)

Shortcut to check for opaque pointers without a cast to PointerType.
---
 include/llvm/IR/Type.h     | 3 +++
 lib/AsmParser/LLParser.cpp | 2 +-
 lib/IR/Type.cpp            | 9 +++++++--
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/llvm/IR/Type.h b/include/llvm/IR/Type.h
index 1cf4db59908..430bc34a47e 100644
--- a/include/llvm/IR/Type.h
+++ b/include/llvm/IR/Type.h
@@ -227,6 +227,9 @@ public:
   /// True if this is an instance of PointerType.
   bool isPointerTy() const { return getTypeID() == PointerTyID; }
 
+  /// True if this is an instance of an opaque PointerType.
+  bool isOpaquePointerTy() const;
+
   /// Return true if this is a pointer type or a vector of pointer types.
   bool isPtrOrPtrVectorTy() const { return getScalarType()->isPointerTy(); }
 
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index be3b7358270..bcdf51c47f9 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -2575,7 +2575,7 @@ bool LLParser::parseType(Type *&Result, const Twine &Msg, bool AllowVoid) {
   }
   }
 
-  if (Result->isPointerTy() && cast<PointerType>(Result)->isOpaque()) {
+  if (Result->isOpaquePointerTy()) {
     unsigned AddrSpace;
     if (parseOptionalAddrSpace(AddrSpace))
       return true;
diff --git a/lib/IR/Type.cpp b/lib/IR/Type.cpp
index a7be01415fb..a2199897606 100644
--- a/lib/IR/Type.cpp
+++ b/lib/IR/Type.cpp
@@ -60,6 +60,12 @@ bool Type::isIntegerTy(unsigned Bitwidth) const {
   return isIntegerTy() && cast<IntegerType>(this)->getBitWidth() == Bitwidth;
 }
 
+bool Type::isOpaquePointerTy() const {
+  if (auto *PTy = dyn_cast<PointerType>(this))
+    return PTy->isOpaque();
+  return false;
+}
+
 bool Type::canLosslesslyBitCastTo(Type *Ty) const {
   // Identity cast means no change so return true
   if (this == Ty)
@@ -691,8 +697,7 @@ PointerType *PointerType::get(Type *EltTy, unsigned AddressSpace) {
   LLVMContextImpl *CImpl = EltTy->getContext().pImpl;
 
   // Create opaque pointer for pointer to opaque pointer.
-  if (CImpl->ForceOpaquePointers ||
-      (isa<PointerType>(EltTy) && cast<PointerType>(EltTy)->isOpaque()))
+  if (CImpl->ForceOpaquePointers || EltTy->isOpaquePointerTy())
     return get(EltTy->getContext(), AddressSpace);
 
   // Since AddressSpace #0 is the common case, we special case it.