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llvm-6502/lib/ExecutionEngine/MCJIT/MCJIT.cpp
David Tweed abb38fe8de Minor changes to the MCJITTest unittests to use the correct API for finalizing
the JIT object (including XFAIL an ARM test that now needs fixing). Also renames
internal function for consistency.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182085 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-17 10:01:46 +00:00

378 lines
12 KiB
C++

//===-- MCJIT.cpp - MC-based Just-in-Time Compiler ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCJIT.h"
#include "llvm/ExecutionEngine/GenericValue.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/DynamicLibrary.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MutexGuard.h"
using namespace llvm;
namespace {
static struct RegisterJIT {
RegisterJIT() { MCJIT::Register(); }
} JITRegistrator;
}
extern "C" void LLVMLinkInMCJIT() {
}
ExecutionEngine *MCJIT::createJIT(Module *M,
std::string *ErrorStr,
RTDyldMemoryManager *MemMgr,
bool GVsWithCode,
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);
return new MCJIT(M, TM, MemMgr ? MemMgr : new SectionMemoryManager(),
GVsWithCode);
}
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) {
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);
// 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, CompiledObject->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) {
// 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.
// 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;
}
// 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");
}
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);
addGlobalMapping(F, Addr);
return Addr;
}
// 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) {
report_fatal_error("not yet implemented");
}
void MCJIT::freeMachineCodeForFunction(Function *F) {
report_fatal_error("not yet implemented");
}
GenericValue MCJIT::runFunction(Function *F,
const std::vector<GenericValue> &ArgValues) {
assert(F && "Function *F was null at entry to run()");
void *FPtr = getPointerToFunction(F);
assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
FunctionType *FTy = F->getFunctionType();
Type *RetTy = FTy->getReturnType();
assert((FTy->getNumParams() == ArgValues.size() ||
(FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
"Wrong number of arguments passed into function!");
assert(FTy->getNumParams() == ArgValues.size() &&
"This doesn't support passing arguments through varargs (yet)!");
// Handle some common cases first. These cases correspond to common `main'
// prototypes.
if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
switch (ArgValues.size()) {
case 3:
if (FTy->getParamType(0)->isIntegerTy(32) &&
FTy->getParamType(1)->isPointerTy() &&
FTy->getParamType(2)->isPointerTy()) {
int (*PF)(int, char **, const char **) =
(int(*)(int, char **, const char **))(intptr_t)FPtr;
// Call the function.
GenericValue rv;
rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
(char **)GVTOP(ArgValues[1]),
(const char **)GVTOP(ArgValues[2])));
return rv;
}
break;
case 2:
if (FTy->getParamType(0)->isIntegerTy(32) &&
FTy->getParamType(1)->isPointerTy()) {
int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
// Call the function.
GenericValue rv;
rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
(char **)GVTOP(ArgValues[1])));
return rv;
}
break;
case 1:
if (FTy->getNumParams() == 1 &&
FTy->getParamType(0)->isIntegerTy(32)) {
GenericValue rv;
int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
return rv;
}
break;
}
}
// Handle cases where no arguments are passed first.
if (ArgValues.empty()) {
GenericValue rv;
switch (RetTy->getTypeID()) {
default: llvm_unreachable("Unknown return type for function call!");
case Type::IntegerTyID: {
unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
if (BitWidth == 1)
rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
else if (BitWidth <= 8)
rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
else if (BitWidth <= 16)
rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
else if (BitWidth <= 32)
rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
else if (BitWidth <= 64)
rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
else
llvm_unreachable("Integer types > 64 bits not supported");
return rv;
}
case Type::VoidTyID:
rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
return rv;
case Type::FloatTyID:
rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
return rv;
case Type::DoubleTyID:
rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
return rv;
case Type::X86_FP80TyID:
case Type::FP128TyID:
case Type::PPC_FP128TyID:
llvm_unreachable("long double not supported yet");
case Type::PointerTyID:
return PTOGV(((void*(*)())(intptr_t)FPtr)());
}
}
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);
}
}