Adding oprofile support for MCJIT.

Patch by Dmitry Stogov



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192809 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/OProfileJIT/OProfileJITEventListener.cpp

@@ -20,7 +20,9 @@
 #include "llvm/IR/Function.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
 #include "llvm/ExecutionEngine/OProfileWrapper.h"
+#include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Errno.h"
@@ -52,6 +54,10 @@ public:
                                 const JITEvent_EmittedFunctionDetails &Details);
 
   virtual void NotifyFreeingMachineCode(void *OldPtr);
+
+  virtual void NotifyObjectEmitted(const ObjectImage &Obj);
+
+  virtual void NotifyFreeingObject(const ObjectImage &Obj);
 };
 
 void OProfileJITEventListener::initialize() {
@@ -159,6 +165,66 @@ void OProfileJITEventListener::NotifyFreeingMachineCode(void *FnStart) {
   }
 }
 
+void OProfileJITEventListener::NotifyObjectEmitted(const ObjectImage &Obj) {
+  if (!Wrapper.isAgentAvailable()) {
+    return;
+  }
+
+  // Use symbol info to iterate functions in the object.
+  error_code ec;
+  for (object::symbol_iterator I = Obj.begin_symbols(),
+                               E = Obj.end_symbols();
+                        I != E && !ec;
+                        I.increment(ec)) {
+    object::SymbolRef::Type SymType;
+    if (I->getType(SymType)) continue;
+    if (SymType == object::SymbolRef::ST_Function) {
+      StringRef  Name;
+      uint64_t   Addr;
+      uint64_t   Size;
+      if (I->getName(Name)) continue;
+      if (I->getAddress(Addr)) continue;
+      if (I->getSize(Size)) continue;
+
+      if (Wrapper.op_write_native_code(Name.data(), Addr, (void*)Addr, Size)
+                        == -1) {
+        DEBUG(dbgs() << "Failed to tell OProfile about native function "
+          << Name << " at ["
+          << (void*)Addr << "-" << ((char*)Addr + Size) << "]\n");
+        continue;
+      }
+      // TODO: support line number info (similar to IntelJITEventListener.cpp)
+    }
+  }
+}
+
+void OProfileJITEventListener::NotifyFreeingObject(const ObjectImage &Obj) {
+  if (!Wrapper.isAgentAvailable()) {
+    return;
+  }
+
+  // Use symbol info to iterate functions in the object.
+  error_code ec;
+  for (object::symbol_iterator I = Obj.begin_symbols(),
+                               E = Obj.end_symbols();
+                        I != E && !ec;
+                        I.increment(ec)) {
+    object::SymbolRef::Type SymType;
+    if (I->getType(SymType)) continue;
+    if (SymType == object::SymbolRef::ST_Function) {
+      uint64_t   Addr;
+      if (I->getAddress(Addr)) continue;
+
+      if (Wrapper.op_unload_native_code(Addr) == -1) {
+        DEBUG(dbgs()
+          << "Failed to tell OProfile about unload of native function at "
+          << (void*)Addr << "\n");
+        continue;
+      }
+    }
+  }
+}
+
 }  // anonymous namespace.
 
 namespace llvm {

lib/ExecutionEngine/OProfileJIT/OProfileWrapper.cpp

@@ -141,6 +141,10 @@ bool OProfileWrapper::checkForOProfileProcEntry() {
         close(CmdLineFD);
         ssize_t Idx = 0;
 
+        if (ExeName[0] != '/') {
+          BaseName = ExeName;
+        }
+
         // Find the terminator for the first string
         while (Idx < NumRead-1 && ExeName[Idx] != 0) {
           Idx++;
@@ -159,7 +163,8 @@ bool OProfileWrapper::checkForOProfileProcEntry() {
         }
 
         // Test this to see if it is the oprofile daemon
-        if (BaseName != 0 && !strcmp("oprofiled", BaseName)) {
+        if (BaseName != 0 && (!strcmp("oprofiled", BaseName) ||
+                              !strcmp("operf", BaseName))) {
           // If it is, we're done
           closedir(ProcDir);
           return true;