1 files changed, 177 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/OProfileJIT/OProfileJITEventListener.cpp b/lib/ExecutionEngine/OProfileJIT/OProfileJITEventListener.cpp
new file mode 100644
index 0000000000..e6142e3678
--- /dev/null
+++ b/lib/ExecutionEngine/OProfileJIT/OProfileJITEventListener.cpp
@@ -0,0 +1,177 @@
+//===-- OProfileJITEventListener.cpp - Tell OProfile about JITted code ----===//
+//
+//                     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 JITEventListener object that uses OProfileWrapper to tell
+// oprofile about JITted functions, including source line information.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Config/config.h"
+#include "llvm/ExecutionEngine/JITEventListener.h"
+
+#define DEBUG_TYPE "oprofile-jit-event-listener"
+#include "llvm/Function.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/ExecutionEngine/OProfileWrapper.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Errno.h"
+#include "EventListenerCommon.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+
+using namespace llvm;
+using namespace llvm::jitprofiling;
+
+namespace {
+
+class OProfileJITEventListener : public JITEventListener {
+  OProfileWrapper& Wrapper;
+
+  void initialize();
+
+public:
+  OProfileJITEventListener(OProfileWrapper& LibraryWrapper)
+  : Wrapper(LibraryWrapper) {
+    initialize();
+  }
+
+  ~OProfileJITEventListener();
+
+  virtual void NotifyFunctionEmitted(const Function &F,
+                                void *FnStart, size_t FnSize,
+                                const JITEvent_EmittedFunctionDetails &Details);
+
+  virtual void NotifyFreeingMachineCode(void *OldPtr);
+};
+
+void OProfileJITEventListener::initialize() {
+  if (!Wrapper.op_open_agent()) {
+    const std::string err_str = sys::StrError();
+    DEBUG(dbgs() << "Failed to connect to OProfile agent: " << err_str << "\n");
+  } else {
+    DEBUG(dbgs() << "Connected to OProfile agent.\n");
+  }
+}
+
+OProfileJITEventListener::~OProfileJITEventListener() {
+  if (Wrapper.isAgentAvailable()) {
+    if (Wrapper.op_close_agent() == -1) {
+      const std::string err_str = sys::StrError();
+      DEBUG(dbgs() << "Failed to disconnect from OProfile agent: "
+                   << err_str << "\n");
+    } else {
+      DEBUG(dbgs() << "Disconnected from OProfile agent.\n");
+    }
+  }
+}
+
+static debug_line_info LineStartToOProfileFormat(
+    const MachineFunction &MF, FilenameCache &Filenames,
+    uintptr_t Address, DebugLoc Loc) {
+  debug_line_info Result;
+  Result.vma = Address;
+  Result.lineno = Loc.getLine();
+  Result.filename = Filenames.getFilename(
+    Loc.getScope(MF.getFunction()->getContext()));
+  DEBUG(dbgs() << "Mapping " << reinterpret_cast<void*>(Result.vma) << " to "
+               << Result.filename << ":" << Result.lineno << "\n");
+  return Result;
+}
+
+// Adds the just-emitted function to the symbol table.
+void OProfileJITEventListener::NotifyFunctionEmitted(
+    const Function &F, void *FnStart, size_t FnSize,
+    const JITEvent_EmittedFunctionDetails &Details) {
+  assert(F.hasName() && FnStart != 0 && "Bad symbol to add");
+  if (Wrapper.op_write_native_code(F.getName().data(),
+                           reinterpret_cast<uint64_t>(FnStart),
+                           FnStart, FnSize) == -1) {
+    DEBUG(dbgs() << "Failed to tell OProfile about native function "
+          << F.getName() << " at ["
+          << FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
+    return;
+  }
+
+  if (!Details.LineStarts.empty()) {
+    // Now we convert the line number information from the address/DebugLoc
+    // format in Details to the address/filename/lineno format that OProfile
+    // expects.  Note that OProfile 0.9.4 has a bug that causes it to ignore
+    // line numbers for addresses above 4G.
+    FilenameCache Filenames;
+    std::vector<debug_line_info> LineInfo;
+    LineInfo.reserve(1 + Details.LineStarts.size());
+
+    DebugLoc FirstLoc = Details.LineStarts[0].Loc;
+    assert(!FirstLoc.isUnknown()
+           && "LineStarts should not contain unknown DebugLocs");
+    MDNode *FirstLocScope = FirstLoc.getScope(F.getContext());
+    DISubprogram FunctionDI = getDISubprogram(FirstLocScope);
+    if (FunctionDI.Verify()) {
+      // If we have debug info for the function itself, use that as the line
+      // number of the first several instructions.  Otherwise, after filling
+      // LineInfo, we'll adjust the address of the first line number to point at
+      // the start of the function.
+      debug_line_info line_info;
+      line_info.vma = reinterpret_cast<uintptr_t>(FnStart);
+      line_info.lineno = FunctionDI.getLineNumber();
+      line_info.filename = Filenames.getFilename(FirstLocScope);
+      LineInfo.push_back(line_info);
+    }
+
+    for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
+           I = Details.LineStarts.begin(), E = Details.LineStarts.end();
+         I != E; ++I) {
+      LineInfo.push_back(LineStartToOProfileFormat(
+                           *Details.MF, Filenames, I->Address, I->Loc));
+    }
+
+    // In case the function didn't have line info of its own, adjust the first
+    // line info's address to include the start of the function.
+    LineInfo[0].vma = reinterpret_cast<uintptr_t>(FnStart);
+
+    if (Wrapper.op_write_debug_line_info(FnStart, LineInfo.size(),
+                                      &*LineInfo.begin()) == -1) {
+      DEBUG(dbgs()
+            << "Failed to tell OProfile about line numbers for native function "
+            << F.getName() << " at ["
+            << FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
+    }
+  }
+}
+
+// Removes the being-deleted function from the symbol table.
+void OProfileJITEventListener::NotifyFreeingMachineCode(void *FnStart) {
+  assert(FnStart && "Invalid function pointer");
+  if (Wrapper.op_unload_native_code(reinterpret_cast<uint64_t>(FnStart)) == -1) {
+    DEBUG(dbgs()
+          << "Failed to tell OProfile about unload of native function at "
+          << FnStart << "\n");
+  }
+}
+
+}  // anonymous namespace.
+
+namespace llvm {
+JITEventListener *JITEventListener::createOProfileJITEventListener() {
+  static OwningPtr<OProfileWrapper> JITProfilingWrapper(new OProfileWrapper);
+  return new OProfileJITEventListener(*JITProfilingWrapper);
+}
+
+// for testing
+JITEventListener *JITEventListener::createOProfileJITEventListener(
+                                      OProfileWrapper* TestImpl) {
+  return new OProfileJITEventListener(*TestImpl);
+}
+
+} // namespace llvm
+