--- /dev/null
+//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
+//
+// This file defines the abstract interface that implements execution support
+// for LLVM.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef EXECUTION_ENGINE_H
+#define EXECUTION_ENGINE_H
+
+#include <vector>
+#include <string>
+#include <map>
+class Constant;
+class Type;
+class GlobalValue;
+class Function;
+class Module;
+class TargetData;
+union GenericValue;
+
+class ExecutionEngine {
+ Module &CurMod;
+ const TargetData *TD;
+
+protected:
+ // GlobalAddress - A mapping between LLVM global values and their actualized
+ // version...
+ std::map<const GlobalValue*, void *> GlobalAddress;
+
+ void setTargetData(const TargetData &td) {
+ TD = &td;
+ emitGlobals();
+ }
+public:
+ ExecutionEngine(Module *M) : CurMod(*M) {
+ assert(M && "Module is null?");
+ }
+ virtual ~ExecutionEngine();
+
+ Module &getModule() const { return CurMod; }
+ const TargetData &getTargetData() const { return *TD; }
+
+ /// run - Start execution with the specified function and arguments.
+ ///
+ virtual int run(const std::string &FnName,
+ const std::vector<std::string> &Args) = 0;
+
+ /// createJIT - Create an return a new JIT compiler if there is one available
+ /// for the current target. Otherwise it returns null.
+ ///
+ static ExecutionEngine *createJIT(Module *M, unsigned Config);
+
+ /// createInterpreter - Create a new interpreter object. This can never fail.
+ ///
+ static ExecutionEngine *createInterpreter(Module *M, unsigned Config,
+ bool DebugMode, bool TraceMode);
+
+ void addGlobalMapping(const Function *F, void *Addr) {
+ void *&CurVal = GlobalAddress[(const GlobalValue*)F];
+ assert(CurVal == 0 && "GlobalMapping already established!");
+ CurVal = Addr;
+ }
+
+ // getPointerToGlobal - This returns the address of the specified global
+ // value. This may involve code generation if it's a function.
+ //
+ void *getPointerToGlobal(const GlobalValue *GV);
+
+ // getPointerToFunction - The different EE's represent function bodies in
+ // different ways. They should each implement this to say what a function
+ // pointer should look like.
+ //
+ virtual void *getPointerToFunction(const Function *F) = 0;
+
+private:
+ void emitGlobals();
+
+public: // FIXME: protected: // API shared among subclasses
+ GenericValue getConstantValue(const Constant *C);
+ void StoreValueToMemory(GenericValue Val, GenericValue *Ptr, const Type *Ty);
+ void *CreateArgv(const std::vector<std::string> &InputArgv);
+ void InitializeMemory(const Constant *Init, void *Addr);
+};
+
+#endif
--- /dev/null
+//===-- GenericValue.h - Represent any type of LLVM value -------*- C++ -*-===//
+//
+// The GenericValue class is used to represent an LLVM value of arbitrary type.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef GENERIC_VALUE_H
+#define GENERIC_VALUE_H
+
+#include "Support/DataTypes.h"
+
+typedef uint64_t PointerTy;
+
+union GenericValue {
+ bool BoolVal;
+ unsigned char UByteVal;
+ signed char SByteVal;
+ unsigned short UShortVal;
+ signed short ShortVal;
+ unsigned int UIntVal;
+ signed int IntVal;
+ uint64_t ULongVal;
+ int64_t LongVal;
+ double DoubleVal;
+ float FloatVal;
+ PointerTy PointerVal;
+ unsigned char Untyped[8];
+
+ GenericValue() {}
+ GenericValue(void *V) {
+ PointerVal = (PointerTy)(intptr_t)V;
+ }
+};
+
+inline GenericValue PTOGV(void *P) { return GenericValue(P); }
+inline void* GVTOP(const GenericValue &GV) {
+ return (void*)(intptr_t)GV.PointerVal;
+}
+#endif
--- /dev/null
+//===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
+//
+// This file defines the common interface used by the various execution engine
+// subclasses.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ExecutionEngine.h"
+#include "GenericValue.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Module.h"
+#include "llvm/Target/TargetData.h"
+#include "Support/Statistic.h"
+
+Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+
+// getPointerToGlobal - This returns the address of the specified global
+// value. This may involve code generation if it's a function.
+//
+void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
+ if (const Function *F = dyn_cast<Function>(GV))
+ return getPointerToFunction(F);
+
+ assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
+ return GlobalAddress[GV];
+}
+
+
+GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
+ GenericValue Result;
+#define GET_CONST_VAL(TY, CLASS) \
+ case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
+
+ switch (C->getType()->getPrimitiveID()) {
+ GET_CONST_VAL(Bool , ConstantBool);
+ GET_CONST_VAL(UByte , ConstantUInt);
+ GET_CONST_VAL(SByte , ConstantSInt);
+ GET_CONST_VAL(UShort , ConstantUInt);
+ GET_CONST_VAL(Short , ConstantSInt);
+ GET_CONST_VAL(UInt , ConstantUInt);
+ GET_CONST_VAL(Int , ConstantSInt);
+ GET_CONST_VAL(ULong , ConstantUInt);
+ GET_CONST_VAL(Long , ConstantSInt);
+ GET_CONST_VAL(Float , ConstantFP);
+ GET_CONST_VAL(Double , ConstantFP);
+#undef GET_CONST_VAL
+ case Type::PointerTyID:
+ if (isa<ConstantPointerNull>(C)) {
+ Result.PointerVal = 0;
+ } else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
+ Result = PTOGV(getPointerToGlobal(CPR->getValue()));
+
+ } else {
+ assert(0 && "Unknown constant pointer type!");
+ }
+ break;
+ default:
+ cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
+ }
+ return Result;
+}
+
+void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
+ const Type *Ty) {
+ if (getTargetData().isLittleEndian()) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
+ Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
+ break;
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
+ Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
+ Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
+ Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
+ break;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID:
+ case Type::PointerTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
+ Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
+ Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
+ Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
+ Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
+ Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
+ Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
+ Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
+ break;
+ default:
+ cout << "Cannot store value of type " << Ty << "!\n";
+ }
+ } else {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
+ Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
+ break;
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
+ Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
+ Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
+ Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
+ break;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID:
+ case Type::PointerTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
+ Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
+ Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
+ Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
+ Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
+ Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
+ Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
+ Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
+ break;
+ default:
+ cout << "Cannot store value of type " << Ty << "!\n";
+ }
+ }
+}
+
+// InitializeMemory - Recursive function to apply a Constant value into the
+// specified memory location...
+//
+void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
+ if (Init->getType()->isFirstClassType()) {
+ GenericValue Val = getConstantValue(Init);
+ StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
+ return;
+ }
+
+ switch (Init->getType()->getPrimitiveID()) {
+ case Type::ArrayTyID: {
+ const ConstantArray *CPA = cast<ConstantArray>(Init);
+ const vector<Use> &Val = CPA->getValues();
+ unsigned ElementSize =
+ getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
+ for (unsigned i = 0; i < Val.size(); ++i)
+ InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
+ return;
+ }
+
+ case Type::StructTyID: {
+ const ConstantStruct *CPS = cast<ConstantStruct>(Init);
+ const StructLayout *SL =
+ getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
+ const vector<Use> &Val = CPS->getValues();
+ for (unsigned i = 0; i < Val.size(); ++i)
+ InitializeMemory(cast<Constant>(Val[i].get()),
+ (char*)Addr+SL->MemberOffsets[i]);
+ return;
+ }
+
+ default:
+ std::cerr << "Bad Type: " << Init->getType() << "\n";
+ assert(0 && "Unknown constant type to initialize memory with!");
+ }
+}
+
+
+
+void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
+ // Pointers are 64 bits...
+ PointerTy *Result = new PointerTy[InputArgv.size()+1]; // 64 bit assumption
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+
+ for (unsigned i = 0; i < InputArgv.size(); ++i) {
+ unsigned Size = InputArgv[i].size()+1;
+ char *Dest = new char[Size];
+ DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
+
+ copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
+ Dest[Size-1] = 0;
+
+ // Endian safe: Result[i] = (PointerTy)Dest;
+ StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
+ Type::LongTy); // 64 bit assumption
+ }
+
+ Result[InputArgv.size()] = 0;
+ return Result;
+}
+
+/// EmitGlobals - Emit all of the global variables to memory, storing their
+/// addresses into GlobalAddress. This must make sure to copy the contents of
+/// their initializers into the memory.
+///
+void ExecutionEngine::emitGlobals() {
+ const TargetData &TD = getTargetData();
+
+ // Loop over all of the global variables in the program, allocating the memory
+ // to hold them.
+ for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
+ I != E; ++I)
+ if (!I->isExternal()) {
+ // Get the type of the global...
+ const Type *Ty = I->getType()->getElementType();
+
+ // Allocate some memory for it!
+ unsigned Size = TD.getTypeSize(Ty);
+ GlobalAddress[I] = new char[Size];
+ NumInitBytes += Size;
+
+ DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
+ << (void*)GlobalAddress[I] << "\n");
+ } else {
+ assert(0 && "References to external globals not handled yet!");
+ }
+
+ // Now that all of the globals are set up in memory, loop through them all and
+ // initialize their contents.
+ for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
+ I != E; ++I)
+ if (!I->isExternal())
+ InitializeMemory(I->getInitializer(), GlobalAddress[I]);
+}
+
--- /dev/null
+//===- Interpreter.cpp - Top-Level LLVM Interpreter Implementation --------===//
+//
+// This file implements the top-level functionality for the LLVM interpreter.
+// This interpreter is designed to be a very simple, portable, inefficient
+// interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Interpreter.h"
+#include "llvm/Target/TargetMachineImpls.h"
+
+/// createInterpreter - Create a new interpreter object. This can never fail.
+///
+ExecutionEngine *ExecutionEngine::createInterpreter(Module *M,
+ unsigned Config,
+ bool DebugMode,
+ bool TraceMode) {
+ return new Interpreter(M, Config, DebugMode, TraceMode);
+}
+
+//===----------------------------------------------------------------------===//
+// Interpreter ctor - Initialize stuff
+//
+Interpreter::Interpreter(Module *M, unsigned Config,
+ bool DebugMode, bool TraceMode)
+ : ExecutionEngine(M), ExitCode(0), Debug(DebugMode), Trace(TraceMode),
+ CurFrame(-1), TD("lli", (Config & TM::EndianMask) == TM::LittleEndian,
+ 1, 4,
+ (Config & TM::PtrSizeMask) == TM::PtrSize64 ? 8 : 4,
+ (Config & TM::PtrSizeMask) == TM::PtrSize64 ? 8 : 4) {
+
+ setTargetData(TD);
+ // Initialize the "backend"
+ initializeExecutionEngine();
+ initializeExternalMethods();
+ CW.setModule(M); // Update Writer
+}
+
+/// run - Start execution with the specified function and arguments.
+///
+int Interpreter::run(const std::string &MainFunction,
+ const std::vector<std::string> &Args) {
+ // Start interpreter into the main function...
+ //
+ if (!callMainMethod(MainFunction, Args) && !Debug) {
+ // If not in debug mode and if the call succeeded, run the code now...
+ run();
+ }
+
+ // If debug mode, allow the user to interact... also, if the user pressed
+ // ctrl-c or execution hit an error, enter the event loop...
+ if (Debug || isStopped())
+ handleUserInput();
+ return ExitCode;
+}
+
--- /dev/null
+LEVEL = ../../..
+LIBRARYNAME = lli-interpreter
+
+include $(LEVEL)/Makefile.common
--- /dev/null
+//===-- Callback.cpp - Trap handler for function resolution ---------------===//
+//
+// This file defines the SIGSEGV handler which is invoked when a reference to a
+// non-codegen'd function is found.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "Support/Statistic.h"
+#include <signal.h>
+#include <ucontext.h>
+#include <iostream>
+
+static VM *TheVM = 0;
+
+static void TrapHandler(int TN, siginfo_t *SI, ucontext_t *ucp) {
+ assert(TN == SIGSEGV && "Should be SIGSEGV!");
+
+#ifdef REG_EIP /* this code does not compile on Sparc! */
+ if (SI->si_code != SEGV_MAPERR || SI->si_addr != 0 ||
+ ucp->uc_mcontext.gregs[REG_EIP] != 0) {
+ std::cerr << "Bad SEGV encountered!\n";
+ abort();
+ }
+
+ // The call instruction should have pushed the return value onto the stack...
+ unsigned RefAddr = *(unsigned*)ucp->uc_mcontext.gregs[REG_ESP];
+ RefAddr -= 4; // Backtrack to the reference itself...
+
+ DEBUG(std::cerr << "In SEGV handler! Addr=0x" << std::hex << RefAddr
+ << " ESP=0x" << ucp->uc_mcontext.gregs[REG_ESP] << std::dec
+ << ": Resolving call to function: "
+ << TheVM->getFunctionReferencedName((void*)RefAddr) << "\n");
+
+ // Sanity check to make sure this really is a call instruction...
+ assert(((unsigned char*)RefAddr)[-1] == 0xE8 && "Not a call instr!");
+
+ unsigned NewVal = (unsigned)TheVM->resolveFunctionReference((void*)RefAddr);
+
+ // Rewrite the call target... so that we don't fault every time we execute
+ // the call.
+ *(unsigned*)RefAddr = NewVal-RefAddr-4;
+
+ // Change the instruction pointer to be the real target of the call...
+ ucp->uc_mcontext.gregs[REG_EIP] = NewVal;
+
+#endif
+}
+
+
+void VM::registerCallback() {
+ TheVM = this;
+
+ // Register the signal handler...
+ struct sigaction SA;
+ SA.sa_sigaction = (void (*)(int, siginfo_t*, void*))TrapHandler;
+ sigfillset(&SA.sa_mask); // Block all signals while codegen'ing
+ SA.sa_flags = SA_NOCLDSTOP|SA_SIGINFO; // Get siginfo
+ sigaction(SIGSEGV, &SA, 0); // Install the handler
+}
+
+
--- /dev/null
+//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
+//
+// This file implements the top-level support for creating a Just-In-Time
+// compiler for the current architecture.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineImpls.h"
+#include "llvm/Module.h"
+
+
+/// createJIT - Create an return a new JIT compiler if there is one available
+/// for the current target. Otherwise it returns null.
+///
+ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
+ // FIXME: This should be controlled by which subdirectory gets linked in!
+#if !defined(i386) && !defined(__i386__) && !defined(__x86__)
+ return 0;
+#endif
+ // Allocate a target... in the future this will be controllable on the
+ // command line.
+ TargetMachine *Target = allocateX86TargetMachine(Config);
+ assert(Target && "Could not allocate X86 target machine!");
+
+ // Create the virtual machine object...
+ return new VM(M, Target);
+}
+
+VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
+ setTargetData(TM.getTargetData());
+ MCE = createEmitter(*this); // Initialize MCE
+ setupPassManager();
+ registerCallback();
+}
+
+int VM::run(const std::string &FnName, const std::vector<std::string> &Args) {
+ Function *F = getModule().getNamedFunction(FnName);
+ if (F == 0) {
+ std::cerr << "Could not find function '" << FnName <<"' in module!\n";
+ return 1;
+ }
+
+ int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
+ assert(PF != 0 && "Null pointer to function?");
+
+ // Build an argv vector...
+ char **Argv = (char**)CreateArgv(Args);
+
+ // Call the main function...
+ return PF(Args.size(), Argv);
+}
--- /dev/null
+//===-- Emitter.cpp - Write machine code to executable memory -------------===//
+//
+// This file defines a MachineCodeEmitter object that is used by Jello to write
+// machine code to memory and remember where relocatable values lie.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/Function.h"
+#include "Support/Statistic.h"
+
+namespace {
+ Statistic<> NumBytes("jello", "Number of bytes of machine code compiled");
+
+ class Emitter : public MachineCodeEmitter {
+ VM &TheVM;
+
+ unsigned char *CurBlock;
+ unsigned char *CurByte;
+
+ std::vector<std::pair<BasicBlock*, unsigned *> > BBRefs;
+ std::map<BasicBlock*, unsigned> BBLocations;
+ public:
+ Emitter(VM &vm) : TheVM(vm) {}
+
+ virtual void startFunction(MachineFunction &F);
+ virtual void finishFunction(MachineFunction &F);
+ virtual void startBasicBlock(MachineBasicBlock &BB);
+ virtual void emitByte(unsigned char B);
+ virtual void emitPCRelativeDisp(Value *V);
+ virtual void emitGlobalAddress(GlobalValue *V);
+ };
+}
+
+MachineCodeEmitter *VM::createEmitter(VM &V) {
+ return new Emitter(V);
+}
+
+
+#define _POSIX_MAPPED_FILES
+#include <unistd.h>
+#include <sys/mman.h>
+
+static void *getMemory() {
+ return mmap(0, 4096*2, PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+}
+
+
+void Emitter::startFunction(MachineFunction &F) {
+ CurBlock = (unsigned char *)getMemory();
+ CurByte = CurBlock; // Start writing at the beginning of the fn.
+ TheVM.addGlobalMapping(F.getFunction(), CurBlock);
+}
+
+void Emitter::finishFunction(MachineFunction &F) {
+ for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
+ unsigned Location = BBLocations[BBRefs[i].first];
+ unsigned *Ref = BBRefs[i].second;
+ *Ref = Location-(unsigned)Ref-4;
+ }
+ BBRefs.clear();
+ BBLocations.clear();
+
+ NumBytes += CurByte-CurBlock;
+
+ DEBUG(std::cerr << "Finished CodeGen of [" << std::hex << (unsigned)CurBlock
+ << std::dec << "] Function: " << F.getFunction()->getName()
+ << ": " << CurByte-CurBlock << " bytes of text\n");
+}
+
+void Emitter::startBasicBlock(MachineBasicBlock &BB) {
+ BBLocations[BB.getBasicBlock()] = (unsigned)CurByte;
+}
+
+
+void Emitter::emitByte(unsigned char B) {
+ *CurByte++ = B; // Write the byte to memory
+}
+
+
+// emitPCRelativeDisp - For functions, just output a displacement that will
+// cause a reference to the zero page, which will cause a seg-fault, causing
+// things to get resolved on demand. Keep track of these markers.
+//
+// For basic block references, keep track of where the references are so they
+// may be patched up when the basic block is defined.
+//
+void Emitter::emitPCRelativeDisp(Value *V) {
+ if (Function *F = dyn_cast<Function>(V)) {
+ TheVM.addFunctionRef(CurByte, F);
+ unsigned ZeroAddr = -(unsigned)CurByte-4; // Calculate displacement to null
+ *(unsigned*)CurByte = ZeroAddr; // 4 byte offset
+ CurByte += 4;
+ } else {
+ BasicBlock *BB = cast<BasicBlock>(V); // Keep track of reference...
+ BBRefs.push_back(std::make_pair(BB, (unsigned*)CurByte));
+ CurByte += 4;
+ }
+}
+
+void Emitter::emitGlobalAddress(GlobalValue *V) {
+ *(void**)CurByte = TheVM.getPointerToGlobal(V);
+ CurByte += 4;
+}
--- /dev/null
+LEVEL = ../../..
+LIBRARYNAME = lli-jit
+
+include $(LEVEL)/Makefile.common
--- /dev/null
+//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===//
+//
+// This tool implements a just-in-time compiler for LLVM, allowing direct
+// execution of LLVM bytecode in an efficient manner.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/Function.h"
+#include <dlfcn.h> // dlsym access
+
+
+VM::~VM() {
+ delete MCE;
+ delete &TM;
+}
+
+/// setupPassManager - Initialize the VM PassManager object with all of the
+/// passes needed for the target to generate code.
+///
+void VM::setupPassManager() {
+ // Compile LLVM Code down to machine code in the intermediate representation
+ if (TM.addPassesToJITCompile(PM)) {
+ std::cerr << "lli: target '" << TM.getName()
+ << "' doesn't support JIT compilation!\n";
+ abort();
+ }
+
+ // Turn the machine code intermediate representation into bytes in memory that
+ // may be executed.
+ //
+ if (TM.addPassesToEmitMachineCode(PM, *MCE)) {
+ std::cerr << "lli: target '" << TM.getName()
+ << "' doesn't support machine code emission!\n";
+ abort();
+ }
+}
+
+void *VM::resolveFunctionReference(void *RefAddr) {
+ Function *F = FunctionRefs[RefAddr];
+ assert(F && "Reference address not known!");
+
+ void *Addr = getPointerToFunction(F);
+ assert(Addr && "Pointer to function unknown!");
+
+ FunctionRefs.erase(RefAddr);
+ return Addr;
+}
+
+const std::string &VM::getFunctionReferencedName(void *RefAddr) {
+ return FunctionRefs[RefAddr]->getName();
+}
+
+static void NoopFn() {}
+
+/// getPointerToFunction - This method is used to get the address of the
+/// specified function, compiling it if neccesary.
+///
+void *VM::getPointerToFunction(const Function *F) {
+ void *&Addr = GlobalAddress[F]; // Function already code gen'd
+ if (Addr) return Addr;
+
+ if (F->isExternal()) {
+ // If it's an external function, look it up in the process image...
+ void *Ptr = dlsym(0, F->getName().c_str());
+ if (Ptr == 0) {
+ std::cerr << "WARNING: Cannot resolve fn '" << F->getName()
+ << "' using a dummy noop function instead!\n";
+ Ptr = (void*)NoopFn;
+ }
+
+ return Addr = Ptr;
+ }
+
+ // JIT all of the functions in the module. Eventually this will JIT functions
+ // on demand. This has the effect of populating all of the non-external
+ // functions into the GlobalAddress table.
+ PM.run(getModule());
+
+ assert(Addr && "Code generation didn't add function to GlobalAddress table!");
+ return Addr;
+}
projects / oota-llvm.git / commitdiff