From a35bb5c62aa6a6a4c4adcb7fb955eee33d10d7ef Mon Sep 17 00:00:00 2001
From: Andrew Kaylor <andrew.kaylor@intel.com>
Date: Wed, 21 Nov 2012 18:50:33 +0000
Subject: [PATCH] Implementing basic function-level profiling support in
 IntelJITEventListener.

Tests to follow in another patch.

llvm-svn: 168444
---
 .../IntelJITEvents/IntelJITEventListener.cpp       | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/llvm/lib/ExecutionEngine/IntelJITEvents/IntelJITEventListener.cpp b/llvm/lib/ExecutionEngine/IntelJITEvents/IntelJITEventListener.cpp
index 4cb0270..31cee16 100644
--- a/llvm/lib/ExecutionEngine/IntelJITEvents/IntelJITEventListener.cpp
+++ b/llvm/lib/ExecutionEngine/IntelJITEvents/IntelJITEventListener.cpp
@@ -22,6 +22,7 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Errno.h"
@@ -41,6 +42,11 @@ class IntelJITEventListener : public JITEventListener {
   MethodIDMap MethodIDs;
   FilenameCache Filenames;
 
+  typedef SmallVector<const void *, 64> MethodAddressVector;
+  typedef DenseMap<const void *, MethodAddressVector>  ObjectMap;
+
+  ObjectMap  LoadedObjectMap;
+
 public:
   IntelJITEventListener(IntelJITEventsWrapper* libraryWrapper) {
       Wrapper.reset(libraryWrapper);
@@ -169,9 +175,78 @@ void IntelJITEventListener::NotifyFreeingMachineCode(void *FnStart) {
 }
 
 void IntelJITEventListener::NotifyObjectEmitted(const ObjectImage &Obj) {
+  // Get the address of the object image for use as a unique identifier
+  const void* ObjData = Obj.getData().data();
+  MethodAddressVector Functions;
+
+  // 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;
+
+      // Record this address in a local vector
+      Functions.push_back((void*)Addr);
+
+      // Build the function loaded notification message
+      iJIT_Method_Load FunctionMessage = FunctionDescToIntelJITFormat(*Wrapper,
+                                           Name.data(),
+                                           Addr,
+                                           Size);
+
+      // FIXME: Try to find line info for this function in the DWARF sections.
+      FunctionMessage.source_file_name = 0;
+      FunctionMessage.line_number_size = 0;
+      FunctionMessage.line_number_table = 0;
+
+      Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED,
+                                &FunctionMessage);
+      MethodIDs[(void*)Addr] = FunctionMessage.method_id;
+    }
+  }
+
+  // To support object unload notification, we need to keep a list of
+  // registered function addresses for each loaded object.  We will
+  // use the MethodIDs map to get the registered ID for each function.
+  LoadedObjectMap[ObjData] = Functions;
 }
 
 void IntelJITEventListener::NotifyFreeingObject(const ObjectImage &Obj) {
+  // Get the address of the object image for use as a unique identifier
+  const void* ObjData = Obj.getData().data();
+
+  // Get the object's function list from LoadedObjectMap
+  ObjectMap::iterator OI = LoadedObjectMap.find(ObjData);
+  if (OI == LoadedObjectMap.end())
+    return;
+  MethodAddressVector& Functions = OI->second;
+
+  // Walk the function list, unregistering each function
+  for (MethodAddressVector::iterator FI = Functions.begin(),
+                                     FE = Functions.end();
+       FI != FE;
+       ++FI) {
+    void* FnStart = const_cast<void*>(*FI);
+    MethodIDMap::iterator MI = MethodIDs.find(FnStart);
+    if (MI != MethodIDs.end()) {
+      Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_UNLOAD_START,
+                                &MI->second);
+      MethodIDs.erase(MI);
+    }
+  }
+
+  // Erase the object from LoadedObjectMap
+  LoadedObjectMap.erase(OI);
 }
 
 }  // anonymous namespace.
-- 
2.7.4