[llvm] r281143 - Add an isSwiftError predicate to Value

[Arnold Schwaighofer via llvm-commits]

Author: arnolds
Date: Sat Sep 10 13:14:54 2016
New Revision: 281143

URL: http://llvm.org/viewvc/llvm-project?rev=281143&view=rev
Log:
Add an isSwiftError predicate to Value

Modified:
    llvm/trunk/include/llvm/IR/Value.h
    llvm/trunk/lib/IR/Value.cpp

Modified: llvm/trunk/include/llvm/IR/Value.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/Value.h?rev=281143&r1=281142&r2=281143&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/Value.h (original)
+++ llvm/trunk/include/llvm/IR/Value.h Sat Sep 10 13:14:54 2016
@@ -448,6 +448,12 @@ public:
   /// \brief Return true if there is metadata referencing this value.
   bool isUsedByMetadata() const { return IsUsedByMD; }
 
+  /// \brief Return true if this value is a swifterror value.
+  ///
+  /// swifterror values can be either a function argument or an alloca with a
+  /// swifterror attribute.
+  bool isSwiftError() const;
+
   /// \brief Strip off pointer casts, all-zero GEPs, and aliases.
   ///
   /// Returns the original uncasted value.  If this is called on a non-pointer

Modified: llvm/trunk/lib/IR/Value.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/Value.cpp?rev=281143&r1=281142&r2=281143&view=diff
==============================================================================
--- llvm/trunk/lib/IR/Value.cpp (original)
+++ llvm/trunk/lib/IR/Value.cpp Sat Sep 10 13:14:54 2016
@@ -664,6 +664,16 @@ void Value::reverseUseList() {
   Head->setPrev(&UseList);
 }
 
+bool Value::isSwiftError() const {
+  auto *Arg = dyn_cast<Argument>(this);
+  if (Arg)
+    return Arg->hasSwiftErrorAttr();
+  auto *Alloca = dyn_cast<AllocaInst>(this);
+  if (!Alloca)
+    return false;
+  return Alloca->isSwiftError();
+}
+
 //===----------------------------------------------------------------------===//
 //                             ValueHandleBase Class
 //===----------------------------------------------------------------------===//