Update Subzero to start parsing PNaCl bitcode files.

src/IceTranslator.h

+//===- subzero/src/IceTranslator.h - ICE to machine code --------*- 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 the general driver class for translating ICE to
+// machine code.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICETRANSLATOR_H
+#define SUBZERO_SRC_ICETRANSLATOR_H
+
+#include "llvm/ADT/OwningPtr.h"
+
+namespace Ice {
+
+class ClFlags;
+class Cfg;
+class GlobalContext;
+
+// Base class for translating ICE to machine code.
+// Derived classes convert other intermediate representations down to ICE,
+// and then call the appropriate (inherited) methods to convert ICE into
+// machine instructions.
+class Translator {
+public:
+  Translator(GlobalContext *Ctx, ClFlags &Flags)
+      : Ctx(Ctx), Flags(Flags), ExitStatus(0) {}
+
+  ~Translator();
+  int getExitStatus() const { return ExitStatus; }
+
+protected:
+  GlobalContext *Ctx;
+  ClFlags &Flags;
+  // The exit status of the translation. 0 is successful. Nonzero
+  // otherwise.
+  bool ExitStatus;
+  // Ideally, Func would be inside the methods that converts IR to
+  // functions.  However, emitting the constant pool requires a valid
+  // Cfg object, so we need to defer deleting the last non-empty Cfg
+  // object to emit the constant pool (via emitConstants). TODO:
+  // Since all constants are globally pooled in the GlobalContext
+  // object, change all Constant related functions to use
+  // GlobalContext instead of Cfg, and then make emitConstantPool use
+  // that.
+  llvm::OwningPtr<Cfg> Func;
+
+  /// Translates the constructed ICE function Fcn to machine code.
+  /// Note: As a side effect, Field Func is set to Fcn.
+  void translateFcn(Cfg *Fcn);
+
+  /// Emits the constant pool.
+  void emitConstants();
+
+private:
+  Translator(const Translator &) LLVM_DELETED_FUNCTION;
+  Translator &operator=(const Translator &) LLVM_DELETED_FUNCTION;
+};
+}
+
+#endif // SUBZERO_SRC_ICETRANSLATOR_H