Move logic for calculating DBG_VALUE history map into separate file/class.

Summary: No functionality change.

Test Plan: llvm regression test suite.

Reviewers: dblaikie

Reviewed By: dblaikie

Subscribers: echristo, llvm-commits

Differential Revision: http://reviews.llvm.org/D3573

llvm-svn: 207708

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
new file mode 100644
index 00000000000..d919522f9bc
--- /dev/null
+++ b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
@@ -0,0 +1,34 @@
+//===-- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ----*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
+#define CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H_
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace llvm {
+
+class MachineFunction;
+class MachineInstr;
+class MDNode;
+class TargetRegisterInfo;
+
+// For each user variable, keep a list of DBG_VALUE instructions in order.
+// The list can also contain normal instructions that clobber the previous
+// DBG_VALUE.
+typedef DenseMap<const MDNode *, SmallVector<const MachineInstr *, 4>>
+DbgValueHistoryMap;
+
+void calculateDbgValueHistory(const MachineFunction *MF,
+                              const TargetRegisterInfo *TRI,
+                              DbgValueHistoryMap &Result);
+}
+
+#endif