Revert "Adding object caching support to MCJIT"

This reverts commit 07f03923137a91e3cca5d7fc075a22f8c9baf33a.

Looks like it broke the valgrind bot:

http://lab.llvm.org:8011/builders/llvm-x86_64-linux-vg_leak/builds/649

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180249 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 18 insertions, 367 deletions

diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
index 9800759484..733e64af03 100644
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -44,7 +44,6 @@ class JITMemoryManager;
 class MachineCodeInfo;
 class Module;
 class MutexGuard;
-class ObjectCache;
 class DataLayout;
 class Triple;
 class Type;
@@ -374,12 +373,6 @@ public:
   virtual void RegisterJITEventListener(JITEventListener *) {}
   virtual void UnregisterJITEventListener(JITEventListener *) {}
 
-  /// Sets the pre-compiled object cache.  The ownership of the ObjectCache is
-  /// not changed.  Supported by MCJIT but not JIT.
-  virtual void setObjectCache(ObjectCache *) {
-    llvm_unreachable("No support for an object cache");
-  }
-
   /// DisableLazyCompilation - When lazy compilation is off (the default), the
   /// JIT will eagerly compile every function reachable from the argument to
   /// getPointerToFunction.  If lazy compilation is turned on, the JIT will only
diff --git a/include/llvm/ExecutionEngine/ObjectCache.h b/include/llvm/ExecutionEngine/ObjectCache.h
deleted file mode 100644
index 0bee86161b..0000000000
--- a/include/llvm/ExecutionEngine/ObjectCache.h
+++ /dev/null
@@ -1,54 +0,0 @@
-//===-- ObjectCache.h - Class definition for the ObjectCache -----C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIB_EXECUTIONENGINE_OBJECTCACHE_H
-#define LLVM_LIB_EXECUTIONENGINE_OBJECTCACHE_H
-
-#include "llvm/Support/MemoryBuffer.h"
-
-namespace llvm {
-
-class Module;
-
-/// This is the base ObjectCache type which can be provided to an
-/// ExecutionEngine for the purpose of avoiding compilation for Modules that
-/// have already been compiled and an object file is available.
-class ObjectCache {
-public:
-  ObjectCache() { }
-
-  virtual ~ObjectCache() { }
-
-  /// notifyObjectCompiled - Provides a pointer to compiled code for Module M.
-  virtual void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) = 0;
-
-  /// getObjectCopy - Returns a pointer to a newly allocated MemoryBuffer that
-  /// contains the object which corresponds with Module M, or 0 if an object is
-  /// not available. The caller owns the MemoryBuffer returned by this function.
-  MemoryBuffer* getObjectCopy(const Module* M) {
-    const MemoryBuffer* Obj = getObject(M);
-    if (Obj)
-      return MemoryBuffer::getMemBufferCopy(Obj->getBuffer());
-    else
-      return 0;
-  }
-
-protected:
-  /// getObject - Returns a pointer to a MemoryBuffer that contains an object
-  /// that corresponds with Module M, or 0 if an object is not available.
-  /// The pointer returned by this function is not suitable for loading because
-  /// the memory is read-only and owned by the ObjectCache. To retrieve an
-  /// owning pointer to a MemoryBuffer (which is suitable for calling
-  /// RuntimeDyld::loadObject() with) use getObjectCopy() instead.
-  virtual const MemoryBuffer* getObject(const Module* M) = 0;
-};
-
-}
-
-#endif
diff --git a/lib/ExecutionEngine/MCJIT/MCJIT.cpp b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
index 77ea07631c..fee10e1943 100644
--- a/lib/ExecutionEngine/MCJIT/MCJIT.cpp
+++ b/lib/ExecutionEngine/MCJIT/MCJIT.cpp
@@ -52,7 +52,7 @@ ExecutionEngine *MCJIT::createJIT(Module *M,
 MCJIT::MCJIT(Module *m, TargetMachine *tm, RTDyldMemoryManager *MM,
              bool AllocateGVsWithCode)
   : ExecutionEngine(m), TM(tm), Ctx(0), MemMgr(MM), Dyld(MM),
-    IsLoaded(false), M(m), ObjCache(0)  {
+    isCompiled(false), M(m)  {
 
   setDataLayout(TM->getDataLayout());
 }
@@ -64,11 +64,7 @@ MCJIT::~MCJIT() {
   delete TM;
 }
 
-void MCJIT::setObjectCache(ObjectCache* NewCache) {
-  ObjCache = NewCache;
-}
-
-ObjectBufferStream* MCJIT::emitObject(Module *m) {
+void MCJIT::emitObject(Module *m) {
   /// Currently, MCJIT only supports a single module and the module passed to
   /// this function call is expected to be the contained module.  The module
   /// is passed as a parameter here to prepare for multiple module support in
@@ -81,63 +77,30 @@ ObjectBufferStream* MCJIT::emitObject(Module *m) {
   // FIXME: Track compilation state on a per-module basis when multiple modules
   //        are supported.
   // Re-compilation is not supported
-  assert(!IsLoaded);
+  if (isCompiled)
+    return;
 
   PassManager PM;
 
   PM.add(new DataLayout(*TM->getDataLayout()));
 
   // The RuntimeDyld will take ownership of this shortly
-  OwningPtr<ObjectBufferStream> CompiledObject(new ObjectBufferStream());
+  OwningPtr<ObjectBufferStream> Buffer(new ObjectBufferStream());
 
   // Turn the machine code intermediate representation into bytes in memory
   // that may be executed.
-  if (TM->addPassesToEmitMC(PM, Ctx, CompiledObject->getOStream(), false)) {
+  if (TM->addPassesToEmitMC(PM, Ctx, Buffer->getOStream(), false)) {
     report_fatal_error("Target does not support MC emission!");
   }
 
   // Initialize passes.
   PM.run(*m);
   // Flush the output buffer to get the generated code into memory
-  CompiledObject->flush();
-
-  // If we have an object cache, tell it about the new object.
-  // Note that we're using the compiled image, not the loaded image (as below).
-  if (ObjCache) {
-    ObjCache->notifyObjectCompiled(m, CompiledObject->getMemBuffer());
-  }
-
-  return CompiledObject.take();
-}
-
-void MCJIT::loadObject(Module *M) {
-
-  // Get a thread lock to make sure we aren't trying to load multiple times
-  MutexGuard locked(lock);
-
-  // FIXME: Track compilation state on a per-module basis when multiple modules
-  //        are supported.
-  // Re-compilation is not supported
-  if (IsLoaded)
-    return;
-
-  OwningPtr<ObjectBuffer> ObjectToLoad;
-  // Try to load the pre-compiled object from cache if possible
-  if (0 != ObjCache) {
-    OwningPtr<MemoryBuffer> PreCompiledObject(ObjCache->getObjectCopy(M));
-    if (0 != PreCompiledObject.get())
-      ObjectToLoad.reset(new ObjectBuffer(PreCompiledObject.take()));
-  }
-
-  // If the cache did not contain a suitable object, compile the object
-  if (!ObjectToLoad) {
-    ObjectToLoad.reset(emitObject(M));
-    assert(ObjectToLoad.get() && "Compilation did not produce an object.");
-  }
+  Buffer->flush();
 
   // Load the object into the dynamic linker.
   // handing off ownership of the buffer
-  LoadedObject.reset(Dyld.loadObject(ObjectToLoad.take()));
+  LoadedObject.reset(Dyld.loadObject(Buffer.take()));
   if (!LoadedObject)
     report_fatal_error(Dyld.getErrorString());
 
@@ -150,7 +113,7 @@ void MCJIT::loadObject(Module *M) {
   NotifyObjectEmitted(*LoadedObject);
 
   // FIXME: Add support for per-module compilation state
-  IsLoaded = true;
+  isCompiled = true;
 }
 
 // FIXME: Add a parameter to identify which object is being finalized when
@@ -159,10 +122,10 @@ void MCJIT::loadObject(Module *M) {
 // protection in the interface.
 void MCJIT::finalizeObject() {
   // If the module hasn't been compiled, just do that.
-  if (!IsLoaded) {
-    // If the call to Dyld.resolveRelocations() is removed from loadObject()
+  if (!isCompiled) {
+    // If the call to Dyld.resolveRelocations() is removed from emitObject()
     // we'll need to do that here.
-    loadObject(M);
+    emitObject(M);
 
     // Set page permissions.
     MemMgr->applyPermissions();
@@ -188,8 +151,8 @@ void *MCJIT::getPointerToFunction(Function *F) {
   // dies.
 
   // FIXME: Add support for per-module compilation state
-  if (!IsLoaded)
-    loadObject(M);
+  if (!isCompiled)
+    emitObject(M);
 
   if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
     bool AbortOnFailure = !F->hasExternalWeakLinkage();
@@ -321,8 +284,8 @@ GenericValue MCJIT::runFunction(Function *F,
 void *MCJIT::getPointerToNamedFunction(const std::string &Name,
                                        bool AbortOnFailure) {
   // FIXME: Add support for per-module compilation state
-  if (!IsLoaded)
-    loadObject(M);
+  if (!isCompiled)
+    emitObject(M);
 
   if (!isSymbolSearchingDisabled() && MemMgr) {
     void *ptr = MemMgr->getPointerToNamedFunction(Name, false);
diff --git a/lib/ExecutionEngine/MCJIT/MCJIT.h b/lib/ExecutionEngine/MCJIT/MCJIT.h
index 8c4bf6e1db..283a8e5281 100644
--- a/lib/ExecutionEngine/MCJIT/MCJIT.h
+++ b/lib/ExecutionEngine/MCJIT/MCJIT.h
@@ -12,7 +12,6 @@
 
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
-#include "llvm/ExecutionEngine/ObjectCache.h"
 #include "llvm/ExecutionEngine/RuntimeDyld.h"
 #include "llvm/PassManager.h"
 
@@ -35,23 +34,16 @@ class MCJIT : public ExecutionEngine {
   SmallVector<JITEventListener*, 2> EventListeners;
 
   // FIXME: Add support for multiple modules
-  bool IsLoaded;
+  bool isCompiled;
   Module *M;
   OwningPtr<ObjectImage> LoadedObject;
 
-  // An optional ObjectCache to be notified of compiled objects and used to
-  // perform lookup of pre-compiled code to avoid re-compilation.
-  ObjectCache *ObjCache;
-
 public:
   ~MCJIT();
 
   /// @name ExecutionEngine interface implementation
   /// @{
 
-  /// Sets the object manager that MCJIT should use to avoid compilation.
-  virtual void setObjectCache(ObjectCache *manager);
-
   virtual void finalizeObject();
 
   virtual void *getPointerToBasicBlock(BasicBlock *BB);
@@ -110,9 +102,7 @@ protected:
   /// this function call is expected to be the contained module.  The module
   /// is passed as a parameter here to prepare for multiple module support in 
   /// the future.
-  ObjectBufferStream* emitObject(Module *M);
-
-  void loadObject(Module *M);
+  void emitObject(Module *M);
 
   void NotifyObjectEmitted(const ObjectImage& Obj);
   void NotifyFreeingObject(const ObjectImage& Obj);
diff --git a/unittests/ExecutionEngine/MCJIT/CMakeLists.txt b/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
index 9ffe6138ad..c6b1f77e3e 100644
--- a/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
+++ b/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
@@ -10,7 +10,6 @@ set(LLVM_LINK_COMPONENTS
 set(MCJITTestsSources
   MCJITTest.cpp
   MCJITMemoryManagerTest.cpp
-  MCJITObjectCacheTest.cpp
   )
 
 if(MSVC)
diff --git a/unittests/ExecutionEngine/MCJIT/MCJITObjectCacheTest.cpp b/unittests/ExecutionEngine/MCJIT/MCJITObjectCacheTest.cpp
deleted file mode 100644
index 0061e30e7a..0000000000
--- a/unittests/ExecutionEngine/MCJIT/MCJITObjectCacheTest.cpp
+++ /dev/null
@@ -1,240 +0,0 @@
-//===- MCJITObjectCacheTest.cpp - Unit tests for MCJIT object caching -----===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringSet.h"
-#include "llvm/ExecutionEngine/JIT.h"
-#include "llvm/ExecutionEngine/MCJIT.h"
-#include "llvm/ExecutionEngine/ObjectCache.h"
-#include "llvm/ExecutionEngine/SectionMemoryManager.h"
-#include "MCJITTestBase.h"
-#include "gtest/gtest.h"
-
-using namespace llvm;
-
-namespace {
-
-class TestObjectCache : public ObjectCache {
-public:
-  TestObjectCache() : DuplicateInserted(false) { }
-
-  virtual ~TestObjectCache() {
-    // Free any buffers we've allocated.
-    SmallVector<MemoryBuffer *, 2>::iterator it, end;
-    end = AllocatedBuffers.end();
-    for (it = AllocatedBuffers.begin(); it != end; ++it) {
-      delete *it;
-    }
-    AllocatedBuffers.clear();
-  }
-
-  virtual void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) {
-    // If we've seen this module before, note that.
-    const std::string ModuleID = M->getModuleIdentifier();
-    if (ObjMap.find(ModuleID) != ObjMap.end())
-      DuplicateInserted = true;
-    // Store a copy of the buffer in our map.
-    ObjMap[ModuleID] = copyBuffer(Obj);
-  }
-
-  // Test-harness-specific functions
-  bool wereDuplicatesInserted() { return DuplicateInserted; }
-
-  bool wasModuleLookedUp(const Module *M) {
-    return ModulesLookedUp.find(M->getModuleIdentifier())
-                                      != ModulesLookedUp.end();
-  }
-
-  const MemoryBuffer* getObjectInternal(const Module* M) {
-    // Look for the module in our map.
-    const std::string ModuleID = M->getModuleIdentifier();
-    StringMap<const MemoryBuffer *>::iterator it = ObjMap.find(ModuleID);
-    if (it == ObjMap.end())
-      return 0;
-    return it->second;
-  }
-
-protected:
-  virtual const MemoryBuffer* getObject(const Module* M) {
-    const MemoryBuffer* BufferFound = getObjectInternal(M);
-    ModulesLookedUp.insert(M->getModuleIdentifier());
-    return BufferFound;
-  }
-
-private:
-  MemoryBuffer *copyBuffer(const MemoryBuffer *Buf) {
-    // Create a local copy of the buffer.
-    MemoryBuffer *NewBuffer = MemoryBuffer::getMemBufferCopy(Buf->getBuffer());
-    AllocatedBuffers.push_back(NewBuffer);
-    return NewBuffer;
-  }
-
-  StringMap<const MemoryBuffer *> ObjMap;
-  StringSet<>                     ModulesLookedUp;
-  SmallVector<MemoryBuffer *, 2>  AllocatedBuffers;
-  bool                            DuplicateInserted;
-};
-
-class MCJITObjectCacheTest : public testing::Test, public MCJITTestBase {
-protected:
-
-  enum {
-    OriginalRC = 6,
-    ReplacementRC = 7
-  };
-
-  virtual void SetUp() {
-    M.reset(createEmptyModule("<main>"));
-    Main = insertMainFunction(M.get(), OriginalRC);
-  }
-
-  void compileAndRun(int ExpectedRC = OriginalRC) {
-    // This function shouldn't be called until after SetUp.
-    ASSERT_TRUE(0 != TheJIT);
-    ASSERT_TRUE(0 != Main);
-
-    TheJIT->finalizeObject();
-    void *vPtr = TheJIT->getPointerToFunction(Main);
-
-    static_cast<SectionMemoryManager*>(MM)->invalidateInstructionCache();
-
-    EXPECT_TRUE(0 != vPtr)
-      << "Unable to get pointer to main() from JIT";
-
-    int (*FuncPtr)(void) = (int(*)(void))(intptr_t)vPtr;
-    int returnCode = FuncPtr();
-    EXPECT_EQ(returnCode, ExpectedRC);
-  }
-
-  Function *Main;
-};
-
-TEST_F(MCJITObjectCacheTest, SetNullObjectCache) {
-  SKIP_UNSUPPORTED_PLATFORM;
-
-  createJIT(M.take());
-
-  TheJIT->setObjectCache(NULL);
-
-  compileAndRun();
-}
-
-
-TEST_F(MCJITObjectCacheTest, VerifyBasicObjectCaching) {
-  SKIP_UNSUPPORTED_PLATFORM;
-
-  OwningPtr<TestObjectCache>  Cache(new TestObjectCache);
-
-  // Save a copy of the module pointer before handing it off to MCJIT.
-  const Module * SavedModulePointer = M.get();
-
-  createJIT(M.take());
-
-  TheJIT->setObjectCache(Cache.get());
-
-  // Verify that our object cache does not contain the module yet.
-  const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
-  EXPECT_EQ(0, ObjBuffer);
-
-  compileAndRun();
-
-  // Verify that MCJIT tried to look-up this module in the cache.
-  EXPECT_TRUE(Cache->wasModuleLookedUp(SavedModulePointer));
-
-  // Verify that our object cache now contains the module.
-  ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
-  EXPECT_TRUE(0 != ObjBuffer);
-
-  // Verify that the cache was only notified once.
-  EXPECT_FALSE(Cache->wereDuplicatesInserted());
-}
-
-TEST_F(MCJITObjectCacheTest, VerifyLoadFromCache) {
-  SKIP_UNSUPPORTED_PLATFORM;
-
-  OwningPtr<TestObjectCache>  Cache(new TestObjectCache);
-
-  // Compile this module with an MCJIT engine
-  createJIT(M.take());
-  TheJIT->setObjectCache(Cache.get());
-  TheJIT->finalizeObject();
-
-  // Destroy the MCJIT engine we just used
-  TheJIT.reset();
-
-  // Create a new memory manager.
-  MM = new SectionMemoryManager;
-
-  // Create a new module and save it. Use a different return code so we can
-  // tell if MCJIT compiled this module or used the cache.
-  M.reset(createEmptyModule("<main>"));
-  Main = insertMainFunction(M.get(), ReplacementRC);
-  const Module * SecondModulePointer = M.get();
-
-  // Create a new MCJIT instance to load this module then execute it.
-  createJIT(M.take());
-  TheJIT->setObjectCache(Cache.get());
-  compileAndRun();
-
-  // Verify that MCJIT tried to look-up this module in the cache.
-  EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
-
-  // Verify that MCJIT didn't try to cache this again.
-  EXPECT_FALSE(Cache->wereDuplicatesInserted());
-}
-
-TEST_F(MCJITObjectCacheTest, VerifyNonLoadFromCache) {
-  SKIP_UNSUPPORTED_PLATFORM;
-
-  OwningPtr<TestObjectCache>  Cache(new TestObjectCache);
-
-  // Compile this module with an MCJIT engine
-  createJIT(M.take());
-  TheJIT->setObjectCache(Cache.get());
-  TheJIT->finalizeObject();
-
-  // Destroy the MCJIT engine we just used
-  TheJIT.reset();
-
-  // Create a new memory manager.
-  MM = new SectionMemoryManager;
-
-  // Create a new module and save it. Use a different return code so we can
-  // tell if MCJIT compiled this module or used the cache. Note that we use
-  // a new module name here so the module shouldn't be found in the cache.
-  M.reset(createEmptyModule("<not-main>"));
-  Main = insertMainFunction(M.get(), ReplacementRC);
-  const Module * SecondModulePointer = M.get();
-
-  // Create a new MCJIT instance to load this module then execute it.
-  createJIT(M.take());
-  TheJIT->setObjectCache(Cache.get());
-
-  // Verify that our object cache does not contain the module yet.
-  const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
-  EXPECT_EQ(0, ObjBuffer);
-
-  // Run the function and look for the replacement return code.
-  compileAndRun(ReplacementRC);
-
-  // Verify that MCJIT tried to look-up this module in the cache.
-  EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
-
-  // Verify that our object cache now contains the module.
-  ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
-  EXPECT_TRUE(0 != ObjBuffer);
-
-  // Verify that MCJIT didn't try to cache this again.
-  EXPECT_FALSE(Cache->wereDuplicatesInserted());
-}
-
-} // Namespace
-