"This patch adds a virtual call to AbstractLatticeFunction to derive a

type lattice value for an Argument*, giving clients the opportunity to
use something other than Top for it if they choose to."

Patch by John McCall!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54589 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/include/llvm/Analysis/SparsePropagation.h b/include/llvm/Analysis/SparsePropagation.h
index bc9ae61..a054c76 100644
--- a/include/llvm/Analysis/SparsePropagation.h
+++ b/include/llvm/Analysis/SparsePropagation.h
@@ -24,6 +24,7 @@
 namespace llvm {
   class Value;
   class Constant;
+  class Argument;
   class Instruction;
   class PHINode;
   class TerminatorInst;
@@ -75,6 +76,12 @@ public:
   virtual Constant *GetConstant(LatticeVal LV, Value *Val, SparseSolver &SS) {
     return 0;
   }
+
+  /// ComputeArgument - Given a formal argument value, compute and return a
+  /// lattice value corresponding to the specified argument.
+  virtual LatticeVal ComputeArgument(Argument *I) {
+    return getOverdefinedVal(); // always safe
+  }
   
   /// MergeValues - Compute and return the merge of the two specified lattice
   /// values.  Merging should only move one direction down the lattice to