1 files changed, 110 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h b/contrib/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h
new file mode 100644
index 000000000000..aaf6180c9404
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h
@@ -0,0 +1,110 @@
+//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a class that can take bytes that would normally be
+// streamed via the AsmPrinter.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
+
+#include "DIEHash.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/LEB128.h"
+#include <string>
+
+namespace llvm {
+class ByteStreamer {
+ protected:
+  ~ByteStreamer() = default;
+  ByteStreamer(const ByteStreamer&) = default;
+  ByteStreamer() = default;
+
+ public:
+  // For now we're just handling the calls we need for dwarf emission/hashing.
+  virtual void EmitInt8(uint8_t Byte, const Twine &Comment = "") = 0;
+  virtual void EmitSLEB128(uint64_t DWord, const Twine &Comment = "") = 0;
+  virtual void EmitULEB128(uint64_t DWord, const Twine &Comment = "") = 0;
+};
+
+class APByteStreamer final : public ByteStreamer {
+private:
+  AsmPrinter &AP;
+
+public:
+  APByteStreamer(AsmPrinter &Asm) : AP(Asm) {}
+  void EmitInt8(uint8_t Byte, const Twine &Comment) override {
+    AP.OutStreamer->AddComment(Comment);
+    AP.EmitInt8(Byte);
+  }
+  void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
+    AP.OutStreamer->AddComment(Comment);
+    AP.EmitSLEB128(DWord);
+  }
+  void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
+    AP.OutStreamer->AddComment(Comment);
+    AP.EmitULEB128(DWord);
+  }
+};
+
+class HashingByteStreamer final : public ByteStreamer {
+ private:
+  DIEHash &Hash;
+ public:
+ HashingByteStreamer(DIEHash &H) : Hash(H) {}
+  void EmitInt8(uint8_t Byte, const Twine &Comment) override {
+    Hash.update(Byte);
+  }
+  void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
+    Hash.addSLEB128(DWord);
+  }
+  void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
+    Hash.addULEB128(DWord);
+  }
+};
+
+class BufferByteStreamer final : public ByteStreamer {
+private:
+  SmallVectorImpl<char> &Buffer;
+  SmallVectorImpl<std::string> &Comments;
+
+  /// \brief Only verbose textual output needs comments.  This will be set to
+  /// true for that case, and false otherwise.  If false, comments passed in to
+  /// the emit methods will be ignored.
+  bool GenerateComments;
+
+public:
+  BufferByteStreamer(SmallVectorImpl<char> &Buffer,
+                     SmallVectorImpl<std::string> &Comments,
+                     bool GenerateComments)
+  : Buffer(Buffer), Comments(Comments), GenerateComments(GenerateComments) {}
+  void EmitInt8(uint8_t Byte, const Twine &Comment) override {
+    Buffer.push_back(Byte);
+    if (GenerateComments)
+      Comments.push_back(Comment.str());
+  }
+  void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
+    raw_svector_ostream OSE(Buffer);
+    encodeSLEB128(DWord, OSE);
+    if (GenerateComments)
+      Comments.push_back(Comment.str());
+  }
+  void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
+    raw_svector_ostream OSE(Buffer);
+    encodeULEB128(DWord, OSE);
+    if (GenerateComments)
+      Comments.push_back(Comment.str());
+  }
+};
+
+}
+
+#endif