1 files changed, 83 insertions, 0 deletions
diff --git a/contrib/llvm/utils/TableGen/FixedLenDecoderEmitter.h b/contrib/llvm/utils/TableGen/FixedLenDecoderEmitter.h
new file mode 100644
index 0000000..2df5448
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+++ b/contrib/llvm/utils/TableGen/FixedLenDecoderEmitter.h
@@ -0,0 +1,83 @@
+//===------------ FixedLenDecoderEmitter.h - Decoder Generator --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// It contains the tablegen backend that emits the decoder functions for
+// targets with fixed length instruction set.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef FixedLenDECODEREMITTER_H
+#define FixedLenDECODEREMITTER_H
+
+#include "CodeGenTarget.h"
+
+#include "llvm/TableGen/TableGenBackend.h"
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+struct EncodingField {
+  unsigned Base, Width, Offset;
+  EncodingField(unsigned B, unsigned W, unsigned O)
+    : Base(B), Width(W), Offset(O) { }
+};
+
+struct OperandInfo {
+  std::vector<EncodingField> Fields;
+  std::string Decoder;
+
+  OperandInfo(std::string D)
+    : Decoder(D) { }
+
+  void addField(unsigned Base, unsigned Width, unsigned Offset) {
+    Fields.push_back(EncodingField(Base, Width, Offset));
+  }
+
+  unsigned numFields() { return Fields.size(); }
+
+  typedef std::vector<EncodingField>::iterator iterator;
+
+  iterator begin() { return Fields.begin(); }
+  iterator end()   { return Fields.end();   }
+};
+
+class FixedLenDecoderEmitter : public TableGenBackend {
+public:
+  FixedLenDecoderEmitter(RecordKeeper &R,
+                         std::string PredicateNamespace,
+                         std::string GPrefix  = "if (",
+                         std::string GPostfix = " == MCDisassembler::Fail) return MCDisassembler::Fail;",
+                         std::string ROK      = "MCDisassembler::Success",
+                         std::string RFail    = "MCDisassembler::Fail",
+                         std::string L        = "") :
+    Records(R), Target(R),
+    NumberedInstructions(Target.getInstructionsByEnumValue()),
+    PredicateNamespace(PredicateNamespace),
+    GuardPrefix(GPrefix), GuardPostfix(GPostfix),
+    ReturnOK(ROK), ReturnFail(RFail), Locals(L) {}
+
+  // run - Output the code emitter
+  void run(raw_ostream &o);
+
+private:
+  RecordKeeper &Records;
+  CodeGenTarget Target;
+  std::vector<const CodeGenInstruction*> NumberedInstructions;
+  std::vector<unsigned> Opcodes;
+  std::map<unsigned, std::vector<OperandInfo> > Operands;
+public:
+  std::string PredicateNamespace;
+  std::string GuardPrefix, GuardPostfix;
+  std::string ReturnOK, ReturnFail;
+  std::string Locals;
+};
+
+} // end llvm namespace
+
+#endif