diff options
author | Chris Lattner <sabre@nondot.org> | 2002-12-24 00:01:05 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2002-12-24 00:01:05 +0000 |
commit | bd199fb1148b9e16c4e6f3d0ee386c2505a55b71 (patch) | |
tree | 226f64cc95160ebd8da8d2ec4cfaf2babf7c3879 | |
parent | fe11a97fcde7c63109c3ad36570657807d0cd6ef (diff) | |
download | external_llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.zip external_llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.tar.gz external_llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.tar.bz2 |
Initial checkin of new LLI with JIT compiler
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5126 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | include/llvm/ExecutionEngine/ExecutionEngine.h | 86 | ||||
-rw-r--r-- | include/llvm/ExecutionEngine/GenericValue.h | 40 | ||||
-rw-r--r-- | lib/ExecutionEngine/ExecutionEngine.cpp | 226 | ||||
-rw-r--r-- | lib/ExecutionEngine/Interpreter/Interpreter.cpp | 56 | ||||
-rw-r--r-- | lib/ExecutionEngine/Interpreter/Makefile | 4 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/Callback.cpp | 62 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/GlobalVars.cpp | 0 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/JIT.cpp | 53 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/JITEmitter.cpp | 107 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/Makefile | 4 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/VM.cpp | 84 |
11 files changed, 722 insertions, 0 deletions
diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h new file mode 100644 index 0000000..57eee95 --- /dev/null +++ b/include/llvm/ExecutionEngine/ExecutionEngine.h @@ -0,0 +1,86 @@ +//===- 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 diff --git a/include/llvm/ExecutionEngine/GenericValue.h b/include/llvm/ExecutionEngine/GenericValue.h new file mode 100644 index 0000000..f5e70e5 --- /dev/null +++ b/include/llvm/ExecutionEngine/GenericValue.h @@ -0,0 +1,40 @@ +//===-- 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 diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp new file mode 100644 index 0000000..996afe4 --- /dev/null +++ b/lib/ExecutionEngine/ExecutionEngine.cpp @@ -0,0 +1,226 @@ +//===-- 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]); +} + diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.cpp b/lib/ExecutionEngine/Interpreter/Interpreter.cpp new file mode 100644 index 0000000..678c77a --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Interpreter.cpp @@ -0,0 +1,56 @@ +//===- 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; +} + diff --git a/lib/ExecutionEngine/Interpreter/Makefile b/lib/ExecutionEngine/Interpreter/Makefile new file mode 100644 index 0000000..1a7d3bf --- /dev/null +++ b/lib/ExecutionEngine/Interpreter/Makefile @@ -0,0 +1,4 @@ +LEVEL = ../../.. +LIBRARYNAME = lli-interpreter + +include $(LEVEL)/Makefile.common diff --git a/lib/ExecutionEngine/JIT/Callback.cpp b/lib/ExecutionEngine/JIT/Callback.cpp new file mode 100644 index 0000000..b843e10 --- /dev/null +++ b/lib/ExecutionEngine/JIT/Callback.cpp @@ -0,0 +1,62 @@ +//===-- 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 +} + + diff --git a/lib/ExecutionEngine/JIT/GlobalVars.cpp b/lib/ExecutionEngine/JIT/GlobalVars.cpp new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/lib/ExecutionEngine/JIT/GlobalVars.cpp diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp new file mode 100644 index 0000000..b2b56a6 --- /dev/null +++ b/lib/ExecutionEngine/JIT/JIT.cpp @@ -0,0 +1,53 @@ +//===-- 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); +} diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp new file mode 100644 index 0000000..253a229 --- /dev/null +++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp @@ -0,0 +1,107 @@ +//===-- 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; +} diff --git a/lib/ExecutionEngine/JIT/Makefile b/lib/ExecutionEngine/JIT/Makefile new file mode 100644 index 0000000..bc3f709 --- /dev/null +++ b/lib/ExecutionEngine/JIT/Makefile @@ -0,0 +1,4 @@ +LEVEL = ../../.. +LIBRARYNAME = lli-jit + +include $(LEVEL)/Makefile.common diff --git a/lib/ExecutionEngine/JIT/VM.cpp b/lib/ExecutionEngine/JIT/VM.cpp new file mode 100644 index 0000000..f66d4d7 --- /dev/null +++ b/lib/ExecutionEngine/JIT/VM.cpp @@ -0,0 +1,84 @@ +//===-- 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; +} |