#include "llvm/GlobalVariable.h"
#include "llvm/Instructions.h"
#include "llvm/ModuleProvider.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
-#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
+#include "llvm/CodeGen/MachineCodeInfo.h"
#include "llvm/ExecutionEngine/GenericValue.h"
-#include "llvm/Support/MutexGuard.h"
-#include "llvm/System/DynamicLibrary.h"
+#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetJITInfo.h"
-
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MutexGuard.h"
+#include "llvm/System/DynamicLibrary.h"
#include "llvm/Config/config.h"
using namespace llvm;
extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
#endif
+namespace {
+
static struct RegisterJIT {
RegisterJIT() { JIT::Register(); }
} JITRegistrator;
-namespace llvm {
- void LinkInJIT() {
- }
}
-#if defined (__GNUC__)
+extern "C" void LLVMLinkInJIT() {
+}
+
+
+#if defined(__GNUC__) && !defined(__ARM__EABI__)
+
+// libgcc defines the __register_frame function to dynamically register new
+// dwarf frames for exception handling. This functionality is not portable
+// across compilers and is only provided by GCC. We use the __register_frame
+// function here so that code generated by the JIT cooperates with the unwinding
+// runtime of libgcc. When JITting with exception handling enable, LLVM
+// generates dwarf frames and registers it to libgcc with __register_frame.
+//
+// The __register_frame function works with Linux.
+//
+// Unfortunately, this functionality seems to be in libgcc after the unwinding
+// library of libgcc for darwin was written. The code for darwin overwrites the
+// value updated by __register_frame with a value fetched with "keymgr".
+// "keymgr" is an obsolete functionality, which should be rewritten some day.
+// In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
+// need a workaround in LLVM which uses the "keymgr" to dynamically modify the
+// values of an opaque key, used by libgcc to find dwarf tables.
+
extern "C" void __register_frame(void*);
+
+#if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
+# define USE_KEYMGR 1
+#else
+# define USE_KEYMGR 0
#endif
+#if USE_KEYMGR
+
+namespace {
+
+// LibgccObject - This is the structure defined in libgcc. There is no #include
+// provided for this structure, so we also define it here. libgcc calls it
+// "struct object". The structure is undocumented in libgcc.
+struct LibgccObject {
+ void *unused1;
+ void *unused2;
+ void *unused3;
+
+ /// frame - Pointer to the exception table.
+ void *frame;
+
+ /// encoding - The encoding of the object?
+ union {
+ struct {
+ unsigned long sorted : 1;
+ unsigned long from_array : 1;
+ unsigned long mixed_encoding : 1;
+ unsigned long encoding : 8;
+ unsigned long count : 21;
+ } b;
+ size_t i;
+ } encoding;
+
+ /// fde_end - libgcc defines this field only if some macro is defined. We
+ /// include this field even if it may not there, to make libgcc happy.
+ char *fde_end;
+
+ /// next - At least we know it's a chained list!
+ struct LibgccObject *next;
+};
+
+// "kemgr" stuff. Apparently, all frame tables are stored there.
+extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
+extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
+#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
+
+/// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
+/// probably contains all dwarf tables that are loaded.
+struct LibgccObjectInfo {
+
+ /// seenObjects - LibgccObjects already parsed by the unwinding runtime.
+ ///
+ struct LibgccObject* seenObjects;
+
+ /// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
+ ///
+ struct LibgccObject* unseenObjects;
+
+ unsigned unused[2];
+};
+
+/// darwin_register_frame - Since __register_frame does not work with darwin's
+/// libgcc,we provide our own function, which "tricks" libgcc by modifying the
+/// "Dwarf2 object list" key.
+void DarwinRegisterFrame(void* FrameBegin) {
+ // Get the key.
+ LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
+ _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
+ assert(LOI && "This should be preallocated by the runtime");
+
+ // Allocate a new LibgccObject to represent this frame. Deallocation of this
+ // object may be impossible: since darwin code in libgcc was written after
+ // the ability to dynamically register frames, things may crash if we
+ // deallocate it.
+ struct LibgccObject* ob = (struct LibgccObject*)
+ malloc(sizeof(struct LibgccObject));
+
+ // Do like libgcc for the values of the field.
+ ob->unused1 = (void *)-1;
+ ob->unused2 = 0;
+ ob->unused3 = 0;
+ ob->frame = FrameBegin;
+ ob->encoding.i = 0;
+ ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
+
+ // Put the info on both places, as libgcc uses the first or the the second
+ // field. Note that we rely on having two pointers here. If fde_end was a
+ // char, things would get complicated.
+ ob->fde_end = (char*)LOI->unseenObjects;
+ ob->next = LOI->unseenObjects;
+
+ // Update the key's unseenObjects list.
+ LOI->unseenObjects = ob;
+
+ // Finally update the "key". Apparently, libgcc requires it.
+ _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
+ LOI);
+
+}
+
+}
+#endif // __APPLE__
+#endif // __GNUC__
+
/// createJIT - This is the factory method for creating a JIT for the current
/// machine, it does not fall back to the interpreter. This takes ownership
/// of the module provider.
ExecutionEngine *ExecutionEngine::createJIT(ModuleProvider *MP,
std::string *ErrorStr,
- JITMemoryManager *JMM) {
- ExecutionEngine *EE = JIT::createJIT(MP, ErrorStr, JMM);
+ JITMemoryManager *JMM,
+ CodeGenOpt::Level OptLevel,
+ bool GVsWithCode) {
+ ExecutionEngine *EE = JIT::createJIT(MP, ErrorStr, JMM, OptLevel,
+ GVsWithCode);
if (!EE) return 0;
- // Register routine for informing unwinding runtime about new EH frames
-#if defined(__GNUC__)
- EE->InstallExceptionTableRegister(__register_frame);
-#endif
-
// Make sure we can resolve symbols in the program as well. The zero arg
// to the function tells DynamicLibrary to load the program, not a library.
sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr);
}
JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
- JITMemoryManager *JMM)
- : ExecutionEngine(MP), TM(tm), TJI(tji), jitstate(MP) {
+ JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
+ : ExecutionEngine(MP), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode) {
setTargetData(TM.getTargetData());
- // Initialize MCE
- MCE = createEmitter(*this, JMM);
+ jitstate = new JITState(MP);
+
+ // Initialize JCE
+ JCE = createEmitter(*this, JMM);
// Add target data
MutexGuard locked(lock);
- FunctionPassManager &PM = jitstate.getPM(locked);
+ FunctionPassManager &PM = jitstate->getPM(locked);
PM.add(new TargetData(*TM.getTargetData()));
// Turn the machine code intermediate representation into bytes in memory that
// may be executed.
- if (TM.addPassesToEmitMachineCode(PM, *MCE, false /*fast*/)) {
- cerr << "Target does not support machine code emission!\n";
- abort();
+ if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
+ llvm_report_error("Target does not support machine code emission!");
}
+ // Register routine for informing unwinding runtime about new EH frames
+#if defined(__GNUC__) && !defined(__ARM_EABI__)
+#if USE_KEYMGR
+ struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
+ _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
+
+ // The key is created on demand, and libgcc creates it the first time an
+ // exception occurs. Since we need the key to register frames, we create
+ // it now.
+ if (!LOI)
+ LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
+ _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
+ InstallExceptionTableRegister(DarwinRegisterFrame);
+#else
+ InstallExceptionTableRegister(__register_frame);
+#endif // __APPLE__
+#endif // __GNUC__
+
// Initialize passes.
PM.doInitialization();
}
JIT::~JIT() {
- delete MCE;
+ delete jitstate;
+ delete JCE;
delete &TM;
}
+/// addModuleProvider - Add a new ModuleProvider to the JIT. If we previously
+/// removed the last ModuleProvider, we need re-initialize jitstate with a valid
+/// ModuleProvider.
+void JIT::addModuleProvider(ModuleProvider *MP) {
+ MutexGuard locked(lock);
+
+ if (Modules.empty()) {
+ assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
+
+ jitstate = new JITState(MP);
+
+ FunctionPassManager &PM = jitstate->getPM(locked);
+ PM.add(new TargetData(*TM.getTargetData()));
+
+ // Turn the machine code intermediate representation into bytes in memory
+ // that may be executed.
+ if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
+ llvm_report_error("Target does not support machine code emission!");
+ }
+
+ // Initialize passes.
+ PM.doInitialization();
+ }
+
+ ExecutionEngine::addModuleProvider(MP);
+}
+
+/// removeModuleProvider - If we are removing the last ModuleProvider,
+/// invalidate the jitstate since the PassManager it contains references a
+/// released ModuleProvider.
+Module *JIT::removeModuleProvider(ModuleProvider *MP, std::string *E) {
+ Module *result = ExecutionEngine::removeModuleProvider(MP, E);
+
+ MutexGuard locked(lock);
+
+ if (jitstate->getMP() == MP) {
+ delete jitstate;
+ jitstate = 0;
+ }
+
+ if (!jitstate && !Modules.empty()) {
+ jitstate = new JITState(Modules[0]);
+
+ FunctionPassManager &PM = jitstate->getPM(locked);
+ PM.add(new TargetData(*TM.getTargetData()));
+
+ // Turn the machine code intermediate representation into bytes in memory
+ // that may be executed.
+ if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
+ llvm_report_error("Target does not support machine code emission!");
+ }
+
+ // Initialize passes.
+ PM.doInitialization();
+ }
+ return result;
+}
+
+/// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
+/// and deletes the ModuleProvider and owned Module. Avoids materializing
+/// the underlying module.
+void JIT::deleteModuleProvider(ModuleProvider *MP, std::string *E) {
+ ExecutionEngine::deleteModuleProvider(MP, E);
+
+ MutexGuard locked(lock);
+
+ if (jitstate->getMP() == MP) {
+ delete jitstate;
+ jitstate = 0;
+ }
+
+ if (!jitstate && !Modules.empty()) {
+ jitstate = new JITState(Modules[0]);
+
+ FunctionPassManager &PM = jitstate->getPM(locked);
+ PM.add(new TargetData(*TM.getTargetData()));
+
+ // Turn the machine code intermediate representation into bytes in memory
+ // that may be executed.
+ if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
+ llvm_report_error("Target does not support machine code emission!");
+ }
+
+ // Initialize passes.
+ PM.doInitialization();
+ }
+}
+
/// run - Start execution with the specified function and arguments.
///
GenericValue JIT::runFunction(Function *F,
const FunctionType *FTy = F->getFunctionType();
const Type *RetTy = FTy->getReturnType();
- assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) &&
- "Too many arguments passed into function!");
+ 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)!");
// arguments. Make this function and return.
// First, create the function.
- FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false);
+ FunctionType *STy=FunctionType::get(RetTy, false);
Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
F->getParent());
Args.push_back(C);
}
- CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(), "", StubBB);
+ CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
+ "", StubBB);
+ TheCall->setCallingConv(F->getCallingConv());
TheCall->setTailCall();
if (TheCall->getType() != Type::VoidTy)
- ReturnInst::Create(TheCall, StubBB); // Return result of the call.
+ ReturnInst::Create(TheCall, StubBB); // Return result of the call.
else
- ReturnInst::Create(StubBB); // Just return void.
+ ReturnInst::Create(StubBB); // Just return void.
// Finally, return the value returned by our nullary stub function.
return runFunction(Stub, std::vector<GenericValue>());
}
+void JIT::RegisterJITEventListener(JITEventListener *L) {
+ if (L == NULL)
+ return;
+ MutexGuard locked(lock);
+ EventListeners.push_back(L);
+}
+void JIT::UnregisterJITEventListener(JITEventListener *L) {
+ if (L == NULL)
+ return;
+ MutexGuard locked(lock);
+ std::vector<JITEventListener*>::reverse_iterator I=
+ std::find(EventListeners.rbegin(), EventListeners.rend(), L);
+ if (I != EventListeners.rend()) {
+ std::swap(*I, EventListeners.back());
+ EventListeners.pop_back();
+ }
+}
+void JIT::NotifyFunctionEmitted(
+ const Function &F,
+ void *Code, size_t Size,
+ const JITEvent_EmittedFunctionDetails &Details) {
+ MutexGuard locked(lock);
+ for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
+ EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
+ }
+}
+
+void JIT::NotifyFreeingMachineCode(const Function &F, void *OldPtr) {
+ MutexGuard locked(lock);
+ for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
+ EventListeners[I]->NotifyFreeingMachineCode(F, OldPtr);
+ }
+}
+
/// runJITOnFunction - Run the FunctionPassManager full of
/// just-in-time compilation passes on F, hopefully filling in
/// GlobalAddress[F] with the address of F's machine code.
///
-void JIT::runJITOnFunction(Function *F) {
- static bool isAlreadyCodeGenerating = false;
-
+void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
MutexGuard locked(lock);
+
+ class MCIListener : public JITEventListener {
+ MachineCodeInfo *const MCI;
+ public:
+ MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
+ virtual void NotifyFunctionEmitted(const Function &,
+ void *Code, size_t Size,
+ const EmittedFunctionDetails &) {
+ MCI->setAddress(Code);
+ MCI->setSize(Size);
+ }
+ };
+ MCIListener MCIL(MCI);
+ RegisterJITEventListener(&MCIL);
+
+ runJITOnFunctionUnlocked(F, locked);
+
+ UnregisterJITEventListener(&MCIL);
+}
+
+void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
+ static bool isAlreadyCodeGenerating = false;
assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
// JIT the function
isAlreadyCodeGenerating = true;
- jitstate.getPM(locked).run(*F);
+ jitstate->getPM(locked).run(*F);
isAlreadyCodeGenerating = false;
- // If the function referred to a global variable that had not yet been
- // emitted, it allocates memory for the global, but doesn't emit it yet. Emit
- // all of these globals now.
- while (!jitstate.getPendingGlobals(locked).empty()) {
- const GlobalVariable *GV = jitstate.getPendingGlobals(locked).back();
- jitstate.getPendingGlobals(locked).pop_back();
- EmitGlobalVariable(GV);
+ // If the function referred to another function that had not yet been
+ // read from bitcode, but we are jitting non-lazily, emit it now.
+ while (!jitstate->getPendingFunctions(locked).empty()) {
+ Function *PF = jitstate->getPendingFunctions(locked).back();
+ jitstate->getPendingFunctions(locked).pop_back();
+
+ // JIT the function
+ isAlreadyCodeGenerating = true;
+ jitstate->getPM(locked).run(*PF);
+ isAlreadyCodeGenerating = false;
+
+ // Now that the function has been jitted, ask the JITEmitter to rewrite
+ // the stub with real address of the function.
+ updateFunctionStub(PF);
}
+
+ // If the JIT is configured to emit info so that dlsym can be used to
+ // rewrite stubs to external globals, do so now.
+ if (areDlsymStubsEnabled() && isLazyCompilationDisabled())
+ updateDlsymStubTable();
}
/// getPointerToFunction - This method is used to get the address of the
if (void *Addr = getPointerToGlobalIfAvailable(F))
return Addr; // Check if function already code gen'd
+ MutexGuard locked(lock);
+
+ // Now that this thread owns the lock, check if another thread has already
+ // code gen'd the function.
+ if (void *Addr = getPointerToGlobalIfAvailable(F))
+ return Addr;
+
// Make sure we read in the function if it exists in this Module.
if (F->hasNotBeenReadFromBitcode()) {
// Determine the module provider this function is provided by.
std::string ErrorMsg;
if (MP->materializeFunction(F, &ErrorMsg)) {
- cerr << "Error reading function '" << F->getName()
- << "' from bitcode file: " << ErrorMsg << "\n";
- abort();
+ llvm_report_error("Error reading function '" + F->getName()+
+ "' from bitcode file: " + ErrorMsg);
}
- }
-
- if (void *Addr = getPointerToGlobalIfAvailable(F)) {
- return Addr;
+
+ // Now retry to get the address.
+ if (void *Addr = getPointerToGlobalIfAvailable(F))
+ return Addr;
}
- MutexGuard locked(lock);
-
if (F->isDeclaration()) {
- void *Addr = getPointerToNamedFunction(F->getName());
+ bool AbortOnFailure =
+ !areDlsymStubsEnabled() && !F->hasExternalWeakLinkage();
+ void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
addGlobalMapping(F, Addr);
return Addr;
}
- runJITOnFunction(F);
+ runJITOnFunctionUnlocked(F, locked);
void *Addr = getPointerToGlobalIfAvailable(F);
assert(Addr && "Code generation didn't add function to GlobalAddress table!");
return (void*)&__dso_handle;
#endif
Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str());
- if (Ptr == 0) {
- cerr << "Could not resolve external global address: "
- << GV->getName() << "\n";
- abort();
+ if (Ptr == 0 && !areDlsymStubsEnabled()) {
+ llvm_report_error("Could not resolve external global address: "
+ +GV->getName());
}
+ addGlobalMapping(GV, Ptr);
} else {
- // If the global hasn't been emitted to memory yet, allocate space. We will
- // actually initialize the global after current function has finished
- // compilation.
- const Type *GlobalType = GV->getType()->getElementType();
- size_t S = getTargetData()->getABITypeSize(GlobalType);
- size_t A = getTargetData()->getPreferredAlignment(GV);
- if (A <= 8) {
- Ptr = malloc(S);
- } else {
- // Allocate S+A bytes of memory, then use an aligned pointer within that
- // space.
- Ptr = malloc(S+A);
- unsigned MisAligned = ((intptr_t)Ptr & (A-1));
- Ptr = (char*)Ptr + (MisAligned ? (A-MisAligned) : 0);
- }
- jitstate.getPendingGlobals(locked).push_back(GV);
+ // If the global hasn't been emitted to memory yet, allocate space and
+ // emit it into memory.
+ Ptr = getMemoryForGV(GV);
+ addGlobalMapping(GV, Ptr);
+ EmitGlobalVariable(GV); // Initialize the variable.
}
- addGlobalMapping(GV, Ptr);
return Ptr;
}
-
/// recompileAndRelinkFunction - This method is used to force a function
/// which has already been compiled, to be compiled again, possibly
/// after it has been modified. Then the entry to the old copy is overwritten
return Addr;
}
+/// getMemoryForGV - This method abstracts memory allocation of global
+/// variable so that the JIT can allocate thread local variables depending
+/// on the target.
+///
+char* JIT::getMemoryForGV(const GlobalVariable* GV) {
+ char *Ptr;
+
+ // GlobalVariable's which are not "constant" will cause trouble in a server
+ // situation. It's returned in the same block of memory as code which may
+ // not be writable.
+ if (isGVCompilationDisabled() && !GV->isConstant()) {
+ llvm_report_error("Compilation of non-internal GlobalValue is disabled!");
+ }
+
+ // Some applications require globals and code to live together, so they may
+ // be allocated into the same buffer, but in general globals are allocated
+ // through the memory manager which puts them near the code but not in the
+ // same buffer.
+ const Type *GlobalType = GV->getType()->getElementType();
+ size_t S = getTargetData()->getTypeAllocSize(GlobalType);
+ size_t A = getTargetData()->getPreferredAlignment(GV);
+ if (GV->isThreadLocal()) {
+ MutexGuard locked(lock);
+ Ptr = TJI.allocateThreadLocalMemory(S);
+ } else if (TJI.allocateSeparateGVMemory()) {
+ if (A <= 8) {
+ Ptr = (char*)malloc(S);
+ } else {
+ // Allocate S+A bytes of memory, then use an aligned pointer within that
+ // space.
+ Ptr = (char*)malloc(S+A);
+ unsigned MisAligned = ((intptr_t)Ptr & (A-1));
+ Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
+ }
+ } else if (AllocateGVsWithCode) {
+ Ptr = (char*)JCE->allocateSpace(S, A);
+ } else {
+ Ptr = (char*)JCE->allocateGlobal(S, A);
+ }
+ return Ptr;
+}
+
+void JIT::addPendingFunction(Function *F) {
+ MutexGuard locked(lock);
+ jitstate->getPendingFunctions(locked).push_back(F);
+}
+
+
+JITEventListener::~JITEventListener() {}
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