Vendor import of llvm trunk r154661:

http://llvm.org/svn/llvm-project/llvm/trunk@r154661

1 files changed, 124 insertions, 0 deletions

diff --git a/include/llvm/ExecutionEngine/OProfileWrapper.h b/include/llvm/ExecutionEngine/OProfileWrapper.h
new file mode 100644
index 0000000..ab7f25e
--- /dev/null
+++ b/include/llvm/ExecutionEngine/OProfileWrapper.h
@@ -0,0 +1,124 @@
+//===-- OProfileWrapper.h - OProfile JIT API Wrapper ------------*- 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 OProfileWrapper object that detects if the oprofile
+// daemon is running, and provides wrappers for opagent functions used to
+// communicate with the oprofile JIT interface. The dynamic library libopagent
+// does not need to be linked directly as this object lazily loads the library
+// when the first op_ function is called.
+//
+// See http://oprofile.sourceforge.net/doc/devel/jit-interface.html for the
+// definition of the interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef OPROFILE_WRAPPER_H
+#define OPROFILE_WRAPPER_H
+
+#include "llvm/Support/DataTypes.h"
+#include <opagent.h>
+
+namespace llvm {
+
+
+class OProfileWrapper {
+  typedef  op_agent_t    (*op_open_agent_ptr_t)();
+  typedef  int           (*op_close_agent_ptr_t)(op_agent_t);
+  typedef  int           (*op_write_native_code_ptr_t)(op_agent_t,
+                                                const char*,
+                                                uint64_t,
+                                                void const*,
+                                                const unsigned int);
+  typedef  int           (*op_write_debug_line_info_ptr_t)(op_agent_t,
+                                                void const*,
+                                                size_t,
+                                                struct debug_line_info const*);
+  typedef  int           (*op_unload_native_code_ptr_t)(op_agent_t, uint64_t);
+
+  // Also used for op_minor_version function which has the same signature
+  typedef  int           (*op_major_version_ptr_t)(void);
+
+  // This is not a part of the opagent API, but is useful nonetheless
+  typedef  bool          (*IsOProfileRunningPtrT)(void);
+
+
+  op_agent_t                      Agent;
+  op_open_agent_ptr_t             OpenAgentFunc;
+  op_close_agent_ptr_t            CloseAgentFunc;
+  op_write_native_code_ptr_t      WriteNativeCodeFunc;
+  op_write_debug_line_info_ptr_t  WriteDebugLineInfoFunc;
+  op_unload_native_code_ptr_t     UnloadNativeCodeFunc;
+  op_major_version_ptr_t          MajorVersionFunc;
+  op_major_version_ptr_t          MinorVersionFunc;
+  IsOProfileRunningPtrT           IsOProfileRunningFunc;
+
+  bool Initialized;
+
+public:
+  OProfileWrapper();
+
+  // For testing with a mock opagent implementation, skips the dynamic load and
+  // the function resolution.
+  OProfileWrapper(op_open_agent_ptr_t OpenAgentImpl,
+                  op_close_agent_ptr_t CloseAgentImpl,
+                  op_write_native_code_ptr_t WriteNativeCodeImpl,
+                  op_write_debug_line_info_ptr_t WriteDebugLineInfoImpl,
+                  op_unload_native_code_ptr_t UnloadNativeCodeImpl,
+                  op_major_version_ptr_t MajorVersionImpl,
+                  op_major_version_ptr_t MinorVersionImpl,
+                  IsOProfileRunningPtrT MockIsOProfileRunningImpl = 0)
+  : OpenAgentFunc(OpenAgentImpl),
+    CloseAgentFunc(CloseAgentImpl),
+    WriteNativeCodeFunc(WriteNativeCodeImpl),
+    WriteDebugLineInfoFunc(WriteDebugLineInfoImpl),
+    UnloadNativeCodeFunc(UnloadNativeCodeImpl),
+    MajorVersionFunc(MajorVersionImpl),
+    MinorVersionFunc(MinorVersionImpl),
+    IsOProfileRunningFunc(MockIsOProfileRunningImpl),
+    Initialized(true)
+  {
+  }
+
+  // Calls op_open_agent in the oprofile JIT library and saves the returned
+  // op_agent_t handle internally so it can be used when calling all the other
+  // op_* functions. Callers of this class do not need to keep track of
+  // op_agent_t objects.
+  bool op_open_agent();
+
+  int op_close_agent();
+  int op_write_native_code(const char* name,
+                           uint64_t addr,
+                           void const* code,
+                           const unsigned int size);
+  int op_write_debug_line_info(void const* code,
+                               size_t num_entries,
+                               struct debug_line_info const* info);
+  int op_unload_native_code(uint64_t addr);
+  int op_major_version(void);
+  int op_minor_version(void);
+
+  // Returns true if the oprofiled process is running, the opagent library is
+  // loaded and a connection to the agent has been established, and false
+  // otherwise.
+  bool isAgentAvailable();
+
+private:
+  // Loads the libopagent library and initializes this wrapper if the oprofile
+  // daemon is running
+  bool initialize();
+
+  // Searches /proc for the oprofile daemon and returns true if the process if
+  // found, or false otherwise.
+  bool checkForOProfileProcEntry();
+
+  bool isOProfileRunning();
+};
+
+} // namespace llvm
+
+#endif //OPROFILE_WRAPPER_H