-//===-- MCJIT.cpp - MC-based Just-in-Time Compiler --------------------------===//
+//===-- MCJIT.cpp - MC-based Just-in-Time Compiler ------------------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#include "MCJIT.h"
-#include "MCJITMemoryManager.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
#include "llvm/ExecutionEngine/GenericValue.h"
-#include "llvm/ExecutionEngine/MCJIT.h"
+#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
+#include "llvm/ExecutionEngine/MCJIT.h"
+#include "llvm/ExecutionEngine/ObjectBuffer.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
+#include "llvm/ExecutionEngine/SectionMemoryManager.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/Support/MutexGuard.h"
using namespace llvm;
ExecutionEngine *MCJIT::createJIT(Module *M,
std::string *ErrorStr,
- JITMemoryManager *JMM,
- CodeGenOpt::Level OptLevel,
+ RTDyldMemoryManager *MemMgr,
bool GVsWithCode,
- CodeModel::Model CMM,
- StringRef MArch,
- StringRef MCPU,
- const SmallVectorImpl<std::string>& MAttrs) {
+ TargetMachine *TM) {
// Try to register the program as a source of symbols to resolve against.
//
// FIXME: Don't do this here.
sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
- // Pick a target either via -march or by guessing the native arch.
- //
- // FIXME: This should be lifted out of here, it isn't something which should
- // be part of the JIT policy, rather the burden for this selection should be
- // pushed to clients.
- TargetMachine *TM = MCJIT::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
- if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
- TM->setCodeModel(CMM);
-
- // If the target supports JIT code generation, create the JIT.
- if (TargetJITInfo *TJ = TM->getJITInfo())
- return new MCJIT(M, TM, *TJ, new MCJITMemoryManager(JMM), OptLevel,
- GVsWithCode);
-
- if (ErrorStr)
- *ErrorStr = "target does not support JIT code generation";
- return 0;
+ return new MCJIT(M, TM, MemMgr ? MemMgr : new SectionMemoryManager(),
+ GVsWithCode);
}
-MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
- RTDyldMemoryManager *MM, CodeGenOpt::Level OptLevel,
+MCJIT::MCJIT(Module *m, TargetMachine *tm, RTDyldMemoryManager *MM,
bool AllocateGVsWithCode)
- : ExecutionEngine(m), TM(tm), MemMgr(MM), M(m), OS(Buffer), Dyld(MM) {
+ : ExecutionEngine(m), TM(tm), Ctx(0), MemMgr(MM), Dyld(MM),
+ IsLoaded(false), M(m), ObjCache(0) {
+
+ setDataLayout(TM->getDataLayout());
+}
+
+MCJIT::~MCJIT() {
+ if (LoadedObject)
+ NotifyFreeingObject(*LoadedObject.get());
+ delete MemMgr;
+ delete TM;
+}
+
+void MCJIT::setObjectCache(ObjectCache* NewCache) {
+ ObjCache = NewCache;
+}
+
+ObjectBufferStream* 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
+ /// the future.
+ assert(M == m);
- PM.add(new TargetData(*TM->getTargetData()));
+ // Get a thread lock to make sure we aren't trying to compile multiple times
+ MutexGuard locked(lock);
+
+ // FIXME: Track compilation state on a per-module basis when multiple modules
+ // are supported.
+ // Re-compilation is not supported
+ assert(!IsLoaded);
+
+ PassManager PM;
+
+ PM.add(new DataLayout(*TM->getDataLayout()));
+
+ // The RuntimeDyld will take ownership of this shortly
+ OwningPtr<ObjectBufferStream> CompiledObject(new ObjectBufferStream());
// Turn the machine code intermediate representation into bytes in memory
// that may be executed.
- if (TM->addPassesToEmitMC(PM, Ctx, OS, CodeGenOpt::Default, false)) {
+ if (TM->addPassesToEmitMC(PM, Ctx, CompiledObject->getOStream(), false)) {
report_fatal_error("Target does not support MC emission!");
}
// Initialize passes.
- // FIXME: When we support multiple modules, we'll want to move the code
- // gen and finalization out of the constructor here and do it more
- // on-demand as part of getPointerToFunction().
- PM.run(*M);
- // Flush the output buffer so the SmallVector gets its data.
- OS.flush();
+ 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) {
+ // MemoryBuffer is a thin wrapper around the actual memory, so it's OK
+ // to create a temporary object here and delete it after the call.
+ OwningPtr<MemoryBuffer> MB(CompiledObject->getMemBuffer());
+ ObjCache->notifyObjectCompiled(m, MB.get());
+ }
+
+ 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.");
+ }
// Load the object into the dynamic linker.
- // FIXME: It would be nice to avoid making yet another copy.
- MemoryBuffer *MB = MemoryBuffer::getMemBufferCopy(StringRef(Buffer.data(),
- Buffer.size()));
- if (Dyld.loadObject(MB))
+ // handing off ownership of the buffer
+ LoadedObject.reset(Dyld.loadObject(ObjectToLoad.take()));
+ if (!LoadedObject)
report_fatal_error(Dyld.getErrorString());
+
// Resolve any relocations.
Dyld.resolveRelocations();
+
+ // FIXME: Make this optional, maybe even move it to a JIT event listener
+ LoadedObject->registerWithDebugger();
+
+ NotifyObjectEmitted(*LoadedObject);
+
+ // FIXME: Add support for per-module compilation state
+ IsLoaded = true;
}
-MCJIT::~MCJIT() {
- delete MemMgr;
+// FIXME: Add a parameter to identify which object is being finalized when
+// MCJIT supports multiple modules.
+// FIXME: Provide a way to separate code emission, relocations and page
+// 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()
+ // we'll need to do that here.
+ loadObject(M);
+ } else {
+ // Resolve any relocations.
+ Dyld.resolveRelocations();
+ }
+
+ StringRef EHData = Dyld.getEHFrameSection();
+ if (!EHData.empty())
+ MemMgr->registerEHFrames(EHData);
+
+ // Set page permissions.
+ MemMgr->finalizeMemory();
}
void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
report_fatal_error("not yet implemented");
- return 0;
}
void *MCJIT::getPointerToFunction(Function *F) {
+ // FIXME: This should really return a uint64_t since it's a pointer in the
+ // target address space, not our local address space. That's part of the
+ // ExecutionEngine interface, though. Fix that when the old JIT finally
+ // dies.
+
+ // FIXME: Add support for per-module compilation state
+ if (!IsLoaded)
+ loadObject(M);
+
if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
bool AbortOnFailure = !F->hasExternalWeakLinkage();
void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
return Addr;
}
- Twine Name = TM->getMCAsmInfo()->getGlobalPrefix() + F->getName();
- return (void*)Dyld.getSymbolAddress(Name.str());
+ // FIXME: Should the Dyld be retaining module information? Probably not.
+ // FIXME: Should we be using the mangler for this? Probably.
+ //
+ // This is the accessor for the target address, so make sure to check the
+ // load address of the symbol, not the local address.
+ StringRef BaseName = F->getName();
+ if (BaseName[0] == '\1')
+ return (void*)Dyld.getSymbolLoadAddress(BaseName.substr(1));
+ return (void*)Dyld.getSymbolLoadAddress((TM->getMCAsmInfo()->getGlobalPrefix()
+ + BaseName).str());
}
void *MCJIT::recompileAndRelinkFunction(Function *F) {
void *FPtr = getPointerToFunction(F);
assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
- const FunctionType *FTy = F->getFunctionType();
- const Type *RetTy = FTy->getReturnType();
+ FunctionType *FTy = F->getFunctionType();
+ Type *RetTy = FTy->getReturnType();
assert((FTy->getNumParams() == ArgValues.size() ||
(FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
case Type::FP128TyID:
case Type::PPC_FP128TyID:
llvm_unreachable("long double not supported yet");
- return rv;
case Type::PointerTyID:
return PTOGV(((void*(*)())(intptr_t)FPtr)());
}
}
- assert("Full-featured argument passing not supported yet!");
- return GenericValue();
+ llvm_unreachable("Full-featured argument passing not supported yet!");
+}
+
+void *MCJIT::getPointerToNamedFunction(const std::string &Name,
+ bool AbortOnFailure) {
+ // FIXME: Add support for per-module compilation state
+ if (!IsLoaded)
+ loadObject(M);
+
+ if (!isSymbolSearchingDisabled() && MemMgr) {
+ void *ptr = MemMgr->getPointerToNamedFunction(Name, false);
+ if (ptr)
+ return ptr;
+ }
+
+ /// If a LazyFunctionCreator is installed, use it to get/create the function.
+ if (LazyFunctionCreator)
+ if (void *RP = LazyFunctionCreator(Name))
+ return RP;
+
+ if (AbortOnFailure) {
+ report_fatal_error("Program used external function '"+Name+
+ "' which could not be resolved!");
+ }
+ return 0;
+}
+
+void MCJIT::RegisterJITEventListener(JITEventListener *L) {
+ if (L == NULL)
+ return;
+ MutexGuard locked(lock);
+ EventListeners.push_back(L);
+}
+void MCJIT::UnregisterJITEventListener(JITEventListener *L) {
+ if (L == NULL)
+ return;
+ MutexGuard locked(lock);
+ SmallVector<JITEventListener*, 2>::reverse_iterator I=
+ std::find(EventListeners.rbegin(), EventListeners.rend(), L);
+ if (I != EventListeners.rend()) {
+ std::swap(*I, EventListeners.back());
+ EventListeners.pop_back();
+ }
+}
+void MCJIT::NotifyObjectEmitted(const ObjectImage& Obj) {
+ MutexGuard locked(lock);
+ for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
+ EventListeners[I]->NotifyObjectEmitted(Obj);
+ }
+}
+void MCJIT::NotifyFreeingObject(const ObjectImage& Obj) {
+ MutexGuard locked(lock);
+ for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
+ EventListeners[I]->NotifyFreeingObject(Obj);
+ }
}
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