Initial skeleton of Subzero.

src/IceGlobalContext.h

Index: src/IceGlobalContext.h
diff --git a/src/IceGlobalContext.h b/src/IceGlobalContext.h
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+//===- 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 "llvm/ADT/OwningPtr.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include "IceDefs.h"
+#include "IceTypes.h"
+
+// TODO: Accesses to all non-const fields of IceGlobalContext need to
+// be synchronized, especially the constant pool, the allocator, and
+// the output streams.
+class IceGlobalContext {
+public:
+  IceGlobalContext(llvm::raw_ostream *OsDump, llvm::raw_ostream *OsEmit,
+                   IceVerboseMask VerboseMask, IceString TestPrefix);
+  ~IceGlobalContext();
+
+  // 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.  IceV_Timing is treated specially, so
+  // that running with just IceV_Timing verbosity doesn't trigger an
+  // avalanche of extra output.
+  bool isVerbose(IceVerboseMask Mask = (IceV_All & ~IceV_Timing)) const {
+    return VerboseMask & Mask;
+  }
+  void setVerbose(IceVerboseMask Mask) { VerboseMask = Mask; }
+  void addVerbose(IceVerboseMask Mask) { VerboseMask |= Mask; }
+  void subVerbose(IceVerboseMask Mask) { VerboseMask &= ~Mask; }
+
+  // When emitting assembly, we allow a string to be prepended to
+  // names of translated functions.  This makes it easier to create an
+  // execution test against a reference translator like llc, with both
+  // translators using the same bitcode as input.
+  IceString getTestPrefix() const { return TestPrefix; }
+  IceString mangleName(const IceString &Name) const;
+
+  // Manage IceConstants.
+  // getConstant*() functions are not const because they might add
+  // something to the constant pool.
+  IceConstant *getConstantInt(IceType Type, uint64_t ConstantInt64);
+  IceConstant *getConstantFloat(float Value);
+  IceConstant *getConstantDouble(double Value);
+  // Returns a symbolic constant.  Handle is currently unused but is
+  // reserved to hold something LLVM-specific to facilitate linking.

[JF, 2014/04/16 01:27:32]

What would handle hold?

[Jim Stichnoth, 2014/04/21 20:26:40]

I can't really say concretely, so I killed this whole Handle idea.  We can bring
it back in the future if it turns out to be useful.

+  IceConstant *getConstantSym(IceType Type, const void *Handle, int64_t Offset,
+                              const IceString &Name = "",
+                              bool SuppressMangling = false);
+
+  // Allocate data of type T using the global allocator.
+  template <typename T> T *allocate() { return Allocator.Allocate<T>(); }
+
+  IceOstream StrDump; // Stream for dumping / diagnostics
+  IceOstream StrEmit; // Stream for code emission

[JF, 2014/04/16 01:27:32]

Public?

[Jim Stichnoth, 2014/04/21 20:26:40]

Make them private, with public accessor methods.

+
+private:
+  llvm::BumpPtrAllocator Allocator;
+  IceVerboseMask VerboseMask;
+  llvm::OwningPtr<class IceConstantPool> ConstantPool;
+  const IceString TestPrefix;
+  IceGlobalContext(const IceGlobalContext &) LLVM_DELETED_FUNCTION;
+  IceGlobalContext &operator=(const IceGlobalContext &) LLVM_DELETED_FUNCTION;
+};
+
+#endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H