Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

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"
+#include "IceELFObjectWriter.h"
 #include "IceIntrinsics.h"
 #include "IceRNG.h"
 #include "IceTimerTree.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class ClFlags;
 class FuncSigType;
 
@@ skipping 33 matching lines @@
 
 // TODO: Accesses to all non-const fields of GlobalContext need to
 // be synchronized, especially the constant pool, the allocator, and
 // the output streams.
 class GlobalContext {
   GlobalContext(const GlobalContext &) = delete;
   GlobalContext &operator=(const GlobalContext &) = delete;
 
 public:
   GlobalContext(llvm::raw_ostream *OsDump, llvm::raw_ostream *OsEmit,
-                VerboseMask Mask, TargetArch Arch, OptLevel Opt,
-                IceString TestPrefix, const ClFlags &Flags);
+                ELFStreamer *ELFStreamer, VerboseMask Mask, TargetArch Arch,
+                OptLevel Opt, IceString TestPrefix, const ClFlags &Flags);
   ~GlobalContext();
 
   // Returns true if any of the specified options in the verbose mask
   // are set.  If the argument is omitted, it checks if any verbose
   // options at all are set.
   VerboseMask getVerbose() const { return VMask; }
   bool isVerbose(VerboseMask Mask = IceV_All) const { return VMask & Mask; }
   void setVerbose(VerboseMask Mask) { VMask = Mask; }
   void addVerbose(VerboseMask Mask) { VMask |= Mask; }
   void subVerbose(VerboseMask Mask) { VMask &= ~Mask; }
@@ skipping 49 matching lines @@
   // internal memory pool.  Ownership of the function is maintained by
   // this class instance.
   VariableDeclaration *newVariableDeclaration();
 
   const ClFlags &getFlags() const { return Flags; }
 
   bool isIRGenerationDisabled() const {
     return ALLOW_DISABLE_IR_GEN ? getFlags().DisableIRGeneration : false;
   }
 
-  // Allocate data of type T using the global allocator.
+  // Allocate one instance of data of type T using the global allocator.
   template <typename T> T *allocate() { return Allocator.Allocate<T>(); }
 
+  // Allocate an N element array of data of bytes using the global allocator.
+  template uint8_t *allocateBytes(size_t N, size_t Align) {
+    return reinterpret_cast<uint8_t *>(Allocator.Allocate(N, Align));
+  }
+
   const Intrinsics &getIntrinsicsInfo() const { return IntrinsicsInfo; }
 
   // TODO(wala,stichnot): Make the RNG play nicely with multithreaded
   // translation.
   RandomNumberGenerator &getRNG() { return RNG; }
 
+  ELFObjectWriter *getObjectWriter() const { return ObjectWriter.get(); }
+
+  const GlobalDeclarationList &getGlobalDeclarations() const {
+    return GlobalDeclarations;
+  }
+
   // Reset stats at the beginning of a function.
   void resetStats() { StatsFunction.reset(); }
   void dumpStats(const IceString &Name, bool Final = false);
   void statsUpdateEmitted(uint32_t InstCount) {
     StatsFunction.updateEmitted(InstCount);
     StatsCumulative.updateEmitted(InstCount);
   }
   void statsUpdateRegistersSaved(uint32_t Num) {
     StatsFunction.updateRegistersSaved(Num);
     StatsCumulative.updateRegistersSaved(Num);
@@ skipping 34 matching lines @@
   llvm::BumpPtrAllocator Allocator;
   VerboseMask VMask;
   std::unique_ptr<class ConstantPool> ConstPool;
   Intrinsics IntrinsicsInfo;
   const TargetArch Arch;
   const OptLevel Opt;
   const IceString TestPrefix;
   const ClFlags &Flags;
   bool HasEmittedFirstMethod;
   RandomNumberGenerator RNG;
+  std::unique_ptr<ELFObjectWriter> ObjectWriter;
   CodeStats StatsFunction;
   CodeStats StatsCumulative;
   std::vector<TimerStack> Timers;
-  std::vector<GlobalDeclaration *> GlobalDeclarations;
+  GlobalDeclarationList GlobalDeclarations;
 
   // 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
 // convenient timing of regions of code.
 class TimerMarker {
@@ skipping 15 matching lines @@
 
 private:
   TimerIdT ID;
   GlobalContext *const Ctx;
   const bool Active;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H