Introduce the notion of function addresses in Subzero.

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
 // multiple functions.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEGLOBALCONTEXT_H
 #define SUBZERO_SRC_ICEGLOBALCONTEXT_H
 
 #include <memory>
 
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include "IceDefs.h"
+#include "IceClFlags.h"

[Jim Stichnoth, 2014/10/10 13:15:00]

Is this new include necessary?

[Karl, 2014/10/10 20:17:30]

See line 220. On that line it uses Ctx>getFlags().SubzeroTimiingEnabled. Hence,
yes, it is needed (it didn't create a problem because before this CL, all files
that included this include file also included IceClFlags.h).

 #include "IceIntrinsics.h"
 #include "IceRNG.h"
 #include "IceTimerTree.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class ClFlags;
+class FuncSigType;
+class Function;
+class GlobalVariable;
 
 // This class collects rudimentary statistics during translation.
 class CodeStats {
 public:
   CodeStats()
       : InstructionsEmitted(0), RegistersSaved(0), FrameBytes(0), Spills(0),
         Fills(0) {}
   void reset() { *this = CodeStats(); }
   void updateEmitted(uint32_t InstCount) { InstructionsEmitted += InstCount; }
   void updateRegistersSaved(uint32_t Num) { RegistersSaved += Num; }
@@ skipping 68 matching lines @@
   // 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);
   // getConstantPool() returns a copy of the constant pool for
   // constants of a given type.
   ConstantList getConstantPool(Type Ty) const;
+  // Returns a new function, allocated in an internal memory pool.
+  // Ownership of the function is maintained by this class instance.
+  Function *newFunction(const FuncSigType *Signature, unsigned CallingConv,
+                        unsigned Linkage, bool IsProto);
+
+  // Returns a new global variable, allocated in an internal memory
+  // pool.  Ownership of the function is maintained by this class
+  // instance.
+  GlobalVariable *newGlobalVariable();
 
   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.
@@ skipping 49 matching lines @@
   Intrinsics IntrinsicsInfo;
   const TargetArch Arch;
   const OptLevel Opt;
   const IceString TestPrefix;
   const ClFlags &Flags;
   bool HasEmittedFirstMethod;
   RandomNumberGenerator RNG;
   CodeStats StatsFunction;
   CodeStats StatsCumulative;
   std::vector<TimerStack> Timers;
+  std::vector<GlobalAddress *> GlobalAddresses;
   GlobalContext(const GlobalContext &) = delete;
   GlobalContext &operator=(const GlobalContext &) = delete;
 
   // Private helpers for mangleName()
   typedef llvm::SmallVector<char, 32> ManglerVector;
   void incrementSubstitutions(ManglerVector &OldName) const;
 };
 
 // Helper class to push and pop a timer marker.  The constructor
 // pushes a marker, and the destructor pops it.  This is for
@@ skipping 17 matching lines @@
 
 private:
   TimerIdT ID;
   GlobalContext *const Ctx;
   const bool Active;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H