Subzero: Randomize immediates by constant blinding or pooling.

src/IceGlobalContext.h

 //===- subzero/src/IceGlobalContext.h - Global context defs -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares aspects of the compilation that persist across
@@ skipping 67 matching lines @@
   Constant *getConstantInt(Type Ty, uint64_t ConstantInt64);
   Constant *getConstantFloat(float Value);
   Constant *getConstantDouble(double Value);
   // Returns a symbolic constant.
   Constant *getConstantSym(Type Ty, int64_t Offset, const IceString &Name = "",
                            bool SuppressMangling = false);
   // Returns an undef.
   Constant *getConstantUndef(Type Ty);
   // Returns a zero value.
   Constant *getConstantZero(Type Ty);
+
+  // Adds the given constant to the list of pooled immediates.
+  void addConstantPooledImmediate(IceString Name, Constant *Immediate);

[Jim Stichnoth, 2014/08/13 23:30:25]

Use const IceString & here and all the way up.

Also, can you use const Constant *Immediate?

[wala, 2014/08/16 00:07:12]

const IceString &: Done.

const Constant *: Doesn't work, getImmediatePool() returns a ConstantList whose
elements are non-const.

+
   // getConstantPool() returns a copy of the constant pool for
   // constants of a given type.
   ConstantList getConstantPool(Type Ty) const;
 
+  // getImmediatePool() returns the list of pooled immediates.
+  ConstantList getImmediatePool() const;
+
   const ClFlags &getFlags() const { return Flags; }
 
   // Allocate data of type T using the global allocator.
   template <typename T> T *allocate() { return Allocator.Allocate<T>(); }
 
   const Intrinsics &getIntrinsicsInfo() const { return IntrinsicsInfo; }
 
   // TODO(wala,stichnot): Make the RNG play nicely with multithreaded
   // translation.
   RandomNumberGenerator &getRNG() { return RNG; }
@@ skipping 16 matching lines @@
   GlobalContext &operator=(const GlobalContext &) LLVM_DELETED_FUNCTION;
 
   // Private helpers for mangleName()
   typedef llvm::SmallVector<char, 32> ManglerVector;
   void incrementSubstitutions(ManglerVector &OldName) const;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H