Introduce the notion of function addresses in Subzero.

src/IceConverter.h

Index: src/IceConverter.h
diff --git a/src/IceConverter.h b/src/IceConverter.h
index 763dcaeb4f13010ed5534b1474770f00cc781ba8..d26c34c0fd66cc146c9857868a8fcd53d828574f 100644
--- a/src/IceConverter.h
+++ b/src/IceConverter.h
@@ -14,9 +14,11 @@
 #ifndef SUBZERO_SRC_ICECONVERTER_H
 #define SUBZERO_SRC_ICECONVERTER_H
 
+#include "IceDefs.h"
 #include "IceTranslator.h"
 
 namespace llvm {
+class GlobalValue;
 class Module;
 }
 
@@ -27,18 +29,42 @@ public:
   Converter(llvm::Module *Mod, GlobalContext *Ctx, const Ice::ClFlags &Flags)
       : Translator(Ctx, Flags), Mod(Mod) {}
 
+  ~Converter() {}
+
   /// Converts the LLVM Module to ICE. Sets exit status to false if successful,
   /// true otherwise.
   void convertToIce();
 
+  llvm::Module *getModule() const { return Mod; }
+
+  // Returns the global declaration associated with the corresponding
+  // global value V. If no such global address, generates fatal error.
+  GlobalDeclaration *getGlobalDeclaration(const llvm::GlobalValue *V);
+
 private:
   llvm::Module *Mod;
+  typedef std::map<const llvm::GlobalValue *, GlobalDeclaration *>
+      GlobalDeclarationMapType;
+  GlobalDeclarationMapType GlobalDeclarationMap;
+
+  // Walks module and generates names for unnamed globals using prefix
+  // getFlags().DefaultGlobalPrefix, if the prefix is non-empty.
+  void nameUnnamedGlobalVariables(llvm::Module *Mod);
+
+  // Walks module and generates names for unnamed functions using
+  // prefix getFlags().DefaultFunctionPrefix, if the prefix is
+  // non-empty.
+  void nameUnnamedFunctions(llvm::Module *Mod);
+
   // Converts functions to ICE, and then machine code.
   void convertFunctions();
 
   // Converts globals to ICE, and then machine code.
   void convertGlobals(llvm::Module *Mod);
 
+  // Installs global declarations into GlobalDeclarationMap.
+  void installGlobalDeclarations(llvm::Module *Mod);
+
   Converter(const Converter &) = delete;
   Converter &operator=(const Converter &) = delete;
 };