Introduce DebugInfoProbe. This is used to monitor how llvm optimizer is treating debugging information.

It generates output that lools like

8 times line number info lost by Scalar Replacement of Aggregates (SSAUp) 
1 times line number info lost by Simplify well-known library calls 
12 times variable info lost by Jump Threading



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127381 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 67 insertions, 0 deletions

diff --git a/include/llvm/DebugInfoProbe.h b/include/llvm/DebugInfoProbe.h
new file mode 100644
index 0000000000..78d00dfeed
--- /dev/null
+++ b/include/llvm/DebugInfoProbe.h
@@ -0,0 +1,67 @@
+//===-- DebugInfoProbe.h - DebugInfo Probe ----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a probe, DebugInfoProbe, that can be used by pass
+// manager to analyze how optimizer is treating debugging information.
+// 
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_DEBUGINFOPROBE_H
+#define LLVM_TRANSFORMS_UTILS_DEBUGINFOPROBE_H
+
+#include "llvm/ADT/StringMap.h"
+
+namespace llvm {
+  class Function;
+  class Pass;
+  class DebugInfoProbeImpl;
+
+  /// DebugInfoProbe - This class provides a interface to monitor
+  /// how an optimization pass is preserving debugging information.
+  class DebugInfoProbe {
+    public:
+    DebugInfoProbe();
+    ~DebugInfoProbe();
+
+    /// initialize - Collect information before running an optimization pass.
+    void initialize(StringRef PName, Function &F);
+
+    /// finalize - Collect information after running an optimization pass. This
+    /// must be used after initialization.
+    void finalize(Function &F);
+
+    /// report - Report findings. This should be invoked after finalize.
+    void report();
+
+    private:
+    DebugInfoProbeImpl *pImpl;
+  };
+
+  /// DebugInfoProbeInfo - This class provides an interface that a pass manager
+  /// can use to manage debug info probes.
+  class DebugInfoProbeInfo {
+    StringMap<DebugInfoProbe *> Probes;
+  public:
+    DebugInfoProbeInfo() {}
+
+    /// ~DebugInfoProbeInfo - Report data collected by all probes before deleting
+    /// them.
+    ~DebugInfoProbeInfo();
+
+    /// initialize - Collect information before running an optimization pass.
+    void initialize(Pass *P, Function &F);
+
+    /// finalize - Collect information after running an optimization pass. This
+    /// must be used after initialization.
+    void finalize(Pass *P, Function &F);
+  };
+
+} // End llvm namespace
+
+#endif