mirror of
https://github.com/c64scene-ar/llvm-6502.git
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d2755af8bd
Re-submitting with fix for OCaml dependency problems (removing dependency on SectionMemoryManager when it isn't used). Patch by Fili Pizlo git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180720 91177308-0d34-0410-b5e6-96231b3b80d8
378 lines
12 KiB
C++
378 lines
12 KiB
C++
//===-- MCJIT.cpp - MC-based Just-in-Time Compiler ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "MCJIT.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ExecutionEngine/JITEventListener.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/ExecutionEngine/MCJIT.h"
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#include "llvm/ExecutionEngine/ObjectBuffer.h"
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#include "llvm/ExecutionEngine/ObjectImage.h"
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#include "llvm/ExecutionEngine/SectionMemoryManager.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Support/DynamicLibrary.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/MutexGuard.h"
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using namespace llvm;
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namespace {
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static struct RegisterJIT {
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RegisterJIT() { MCJIT::Register(); }
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} JITRegistrator;
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}
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extern "C" void LLVMLinkInMCJIT() {
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}
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ExecutionEngine *MCJIT::createJIT(Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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bool GVsWithCode,
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TargetMachine *TM) {
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// Try to register the program as a source of symbols to resolve against.
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//
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// FIXME: Don't do this here.
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sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
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return new MCJIT(M, TM, JMM ? JMM : new SectionMemoryManager(), GVsWithCode);
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}
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MCJIT::MCJIT(Module *m, TargetMachine *tm, RTDyldMemoryManager *MM,
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bool AllocateGVsWithCode)
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: ExecutionEngine(m), TM(tm), Ctx(0), MemMgr(MM), Dyld(MM),
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IsLoaded(false), M(m), ObjCache(0) {
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setDataLayout(TM->getDataLayout());
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}
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MCJIT::~MCJIT() {
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if (LoadedObject)
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NotifyFreeingObject(*LoadedObject.get());
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delete MemMgr;
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delete TM;
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}
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void MCJIT::setObjectCache(ObjectCache* NewCache) {
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ObjCache = NewCache;
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}
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ObjectBufferStream* MCJIT::emitObject(Module *m) {
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/// Currently, MCJIT only supports a single module and the module passed to
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/// this function call is expected to be the contained module. The module
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/// is passed as a parameter here to prepare for multiple module support in
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/// the future.
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assert(M == m);
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// Get a thread lock to make sure we aren't trying to compile multiple times
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MutexGuard locked(lock);
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// FIXME: Track compilation state on a per-module basis when multiple modules
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// are supported.
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// Re-compilation is not supported
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assert(!IsLoaded);
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PassManager PM;
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PM.add(new DataLayout(*TM->getDataLayout()));
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// The RuntimeDyld will take ownership of this shortly
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OwningPtr<ObjectBufferStream> CompiledObject(new ObjectBufferStream());
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// Turn the machine code intermediate representation into bytes in memory
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// that may be executed.
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if (TM->addPassesToEmitMC(PM, Ctx, CompiledObject->getOStream(), false)) {
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report_fatal_error("Target does not support MC emission!");
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}
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// Initialize passes.
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PM.run(*m);
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// Flush the output buffer to get the generated code into memory
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CompiledObject->flush();
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// If we have an object cache, tell it about the new object.
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// Note that we're using the compiled image, not the loaded image (as below).
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if (ObjCache) {
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// MemoryBuffer is a thin wrapper around the actual memory, so it's OK
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// to create a temporary object here and delete it after the call.
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OwningPtr<MemoryBuffer> MB(CompiledObject->getMemBuffer());
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ObjCache->notifyObjectCompiled(m, MB.get());
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}
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return CompiledObject.take();
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}
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void MCJIT::loadObject(Module *M) {
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// Get a thread lock to make sure we aren't trying to load multiple times
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MutexGuard locked(lock);
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// FIXME: Track compilation state on a per-module basis when multiple modules
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// are supported.
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// Re-compilation is not supported
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if (IsLoaded)
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return;
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OwningPtr<ObjectBuffer> ObjectToLoad;
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// Try to load the pre-compiled object from cache if possible
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if (0 != ObjCache) {
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OwningPtr<MemoryBuffer> PreCompiledObject(ObjCache->getObjectCopy(M));
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if (0 != PreCompiledObject.get())
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ObjectToLoad.reset(new ObjectBuffer(PreCompiledObject.take()));
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}
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// If the cache did not contain a suitable object, compile the object
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if (!ObjectToLoad) {
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ObjectToLoad.reset(emitObject(M));
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assert(ObjectToLoad.get() && "Compilation did not produce an object.");
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}
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// Load the object into the dynamic linker.
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// handing off ownership of the buffer
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LoadedObject.reset(Dyld.loadObject(ObjectToLoad.take()));
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if (!LoadedObject)
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report_fatal_error(Dyld.getErrorString());
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// Resolve any relocations.
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Dyld.resolveRelocations();
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// FIXME: Make this optional, maybe even move it to a JIT event listener
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LoadedObject->registerWithDebugger();
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NotifyObjectEmitted(*LoadedObject);
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// FIXME: Add support for per-module compilation state
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IsLoaded = true;
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}
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// FIXME: Add a parameter to identify which object is being finalized when
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// MCJIT supports multiple modules.
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// FIXME: Provide a way to separate code emission, relocations and page
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// protection in the interface.
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void MCJIT::finalizeObject() {
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// If the module hasn't been compiled, just do that.
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if (!IsLoaded) {
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// If the call to Dyld.resolveRelocations() is removed from loadObject()
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// we'll need to do that here.
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loadObject(M);
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// Set page permissions.
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MemMgr->applyPermissions();
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return;
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}
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// Resolve any relocations.
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Dyld.resolveRelocations();
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// Set page permissions.
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MemMgr->applyPermissions();
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}
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void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
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report_fatal_error("not yet implemented");
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}
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void *MCJIT::getPointerToFunction(Function *F) {
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// FIXME: This should really return a uint64_t since it's a pointer in the
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// target address space, not our local address space. That's part of the
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// ExecutionEngine interface, though. Fix that when the old JIT finally
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// dies.
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// FIXME: Add support for per-module compilation state
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if (!IsLoaded)
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loadObject(M);
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if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
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bool AbortOnFailure = !F->hasExternalWeakLinkage();
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void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
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addGlobalMapping(F, Addr);
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return Addr;
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}
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// FIXME: Should the Dyld be retaining module information? Probably not.
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// FIXME: Should we be using the mangler for this? Probably.
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//
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// This is the accessor for the target address, so make sure to check the
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// load address of the symbol, not the local address.
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StringRef BaseName = F->getName();
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if (BaseName[0] == '\1')
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return (void*)Dyld.getSymbolLoadAddress(BaseName.substr(1));
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return (void*)Dyld.getSymbolLoadAddress((TM->getMCAsmInfo()->getGlobalPrefix()
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+ BaseName).str());
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}
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void *MCJIT::recompileAndRelinkFunction(Function *F) {
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report_fatal_error("not yet implemented");
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}
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void MCJIT::freeMachineCodeForFunction(Function *F) {
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report_fatal_error("not yet implemented");
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}
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GenericValue MCJIT::runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues) {
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assert(F && "Function *F was null at entry to run()");
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void *FPtr = getPointerToFunction(F);
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assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
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FunctionType *FTy = F->getFunctionType();
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Type *RetTy = FTy->getReturnType();
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assert((FTy->getNumParams() == ArgValues.size() ||
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(FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
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"Wrong number of arguments passed into function!");
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assert(FTy->getNumParams() == ArgValues.size() &&
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"This doesn't support passing arguments through varargs (yet)!");
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// Handle some common cases first. These cases correspond to common `main'
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// prototypes.
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if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
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switch (ArgValues.size()) {
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case 3:
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy() &&
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FTy->getParamType(2)->isPointerTy()) {
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int (*PF)(int, char **, const char **) =
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(int(*)(int, char **, const char **))(intptr_t)FPtr;
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// Call the function.
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GenericValue rv;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1]),
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(const char **)GVTOP(ArgValues[2])));
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return rv;
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}
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break;
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case 2:
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy()) {
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int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
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// Call the function.
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GenericValue rv;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1])));
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return rv;
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}
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break;
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case 1:
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if (FTy->getNumParams() == 1 &&
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FTy->getParamType(0)->isIntegerTy(32)) {
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GenericValue rv;
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int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
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return rv;
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}
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break;
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}
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}
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// Handle cases where no arguments are passed first.
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if (ArgValues.empty()) {
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GenericValue rv;
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switch (RetTy->getTypeID()) {
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default: llvm_unreachable("Unknown return type for function call!");
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case Type::IntegerTyID: {
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unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
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if (BitWidth == 1)
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rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 8)
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rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 16)
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rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 32)
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rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 64)
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rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
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else
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llvm_unreachable("Integer types > 64 bits not supported");
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return rv;
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}
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case Type::VoidTyID:
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rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
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return rv;
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case Type::FloatTyID:
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rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
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return rv;
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case Type::DoubleTyID:
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rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
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return rv;
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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llvm_unreachable("long double not supported yet");
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case Type::PointerTyID:
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return PTOGV(((void*(*)())(intptr_t)FPtr)());
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}
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}
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llvm_unreachable("Full-featured argument passing not supported yet!");
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}
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void *MCJIT::getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure) {
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// FIXME: Add support for per-module compilation state
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if (!IsLoaded)
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loadObject(M);
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if (!isSymbolSearchingDisabled() && MemMgr) {
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void *ptr = MemMgr->getPointerToNamedFunction(Name, false);
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if (ptr)
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return ptr;
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}
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/// If a LazyFunctionCreator is installed, use it to get/create the function.
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if (LazyFunctionCreator)
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if (void *RP = LazyFunctionCreator(Name))
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return RP;
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if (AbortOnFailure) {
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report_fatal_error("Program used external function '"+Name+
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"' which could not be resolved!");
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}
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return 0;
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}
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void MCJIT::RegisterJITEventListener(JITEventListener *L) {
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if (L == NULL)
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return;
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MutexGuard locked(lock);
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EventListeners.push_back(L);
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}
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void MCJIT::UnregisterJITEventListener(JITEventListener *L) {
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if (L == NULL)
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return;
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MutexGuard locked(lock);
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SmallVector<JITEventListener*, 2>::reverse_iterator I=
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std::find(EventListeners.rbegin(), EventListeners.rend(), L);
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if (I != EventListeners.rend()) {
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std::swap(*I, EventListeners.back());
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EventListeners.pop_back();
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}
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}
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void MCJIT::NotifyObjectEmitted(const ObjectImage& Obj) {
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MutexGuard locked(lock);
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for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
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EventListeners[I]->NotifyObjectEmitted(Obj);
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}
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}
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void MCJIT::NotifyFreeingObject(const ObjectImage& Obj) {
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MutexGuard locked(lock);
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for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
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EventListeners[I]->NotifyFreeingObject(Obj);
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}
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}
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