+++ /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
-//===-- 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
-//===-- GlobalVars.cpp - Code to emit global variables to memory ----------===//
-//
-// This file contains the code to generate global variables to memory.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Module.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Constants.h"
-#include "llvm/Target/TargetMachine.h"
-#include "Support/Statistic.h"
-#include "VM.h"
-#include <iostream>
-
-Statistic<> NumInitBytes("jello", "Number of bytes of data area initialized");
-
-/// 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 VM::emitGlobals() {
- const TargetData &TD = TM.getTargetData();
-
- // Loop over all of the global variables in the program, allocating the memory
- // to hold them.
- for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
- if (!I->isExternal()) {
- // Get the type of the global...
- const Type *Ty = I->getType()->getElementType();
-
- // Allocate some memory for it!
- GlobalAddress[I] = new char[TD.getTypeSize(Ty)];
-
- DEBUG(std::cerr << "Allocated global '" << I->getName()
- << "' to addr 0x" << std::hex << GlobalAddress[I] << std::dec
- << "\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 = M.gbegin(), E = M.gend(); I != E; ++I)
- if (!I->isExternal())
- emitConstantToMemory(I->getInitializer(), GlobalAddress[I]);
-}
-
-/// emitConstantToMemory - Use the specified LLVM constant to initialize the
-/// specified region of memory.
-///
-void VM::emitConstantToMemory(Constant *Init, void *Addr) {
- const TargetData &TD = TM.getTargetData();
- NumInitBytes += TD.getTypeSize (Init->getType ());
- if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(Init)) {
- switch (CI->getType()->getPrimitiveID()) {
- case Type::BoolTyID:
- *(char*)Addr = cast<ConstantBool>(CI)->getValue();
- return;
- case Type::UByteTyID:
- *(unsigned char*)Addr = cast<ConstantUInt>(CI)->getValue();
- return;
- case Type::SByteTyID:
- *( signed char*)Addr = cast<ConstantSInt>(CI)->getValue();
- return;
- case Type::UShortTyID:
- *(unsigned short*)Addr = cast<ConstantUInt>(CI)->getValue();
- return;
- case Type::ShortTyID:
- *( signed short*)Addr = cast<ConstantSInt>(CI)->getValue();
- return;
- case Type::UIntTyID:
- *(unsigned int*)Addr = cast<ConstantUInt>(CI)->getValue();
- return;
- case Type::IntTyID:
- *( signed int*)Addr = cast<ConstantSInt>(CI)->getValue();
- return;
- case Type::ULongTyID:
- *(uint64_t*)Addr = cast<ConstantUInt>(CI)->getValue();
- return;
- case Type::LongTyID:
- *(int64_t*)Addr = cast<ConstantSInt>(CI)->getValue();
- return;
- default: break;
- }
- } else if (ConstantFP *CF = dyn_cast <ConstantFP> (Init)) {
- switch (CF->getType ()->getPrimitiveID ()) {
- case Type::FloatTyID:
- *(float*)Addr = CF->getValue ();
- return;
- case Type::DoubleTyID:
- *(double*)Addr = CF->getValue ();
- return;
- default: break;
- }
- } else if (ConstantPointerNull *CP = dyn_cast <ConstantPointerNull> (Init)) {
- // Fill the space with a NULL pointer.
- *(void **)Addr = NULL;
- return;
- } else if (ConstantArray *CA = dyn_cast<ConstantArray>(Init)) {
- unsigned ElementSize = TD.getTypeSize(CA->getType()->getElementType());
- for (unsigned i = 0, e = CA->getType()->getNumElements(); i != e; ++i) {
- emitConstantToMemory(cast<Constant>(CA->getOperand(i)), Addr);
- Addr = (char*)Addr+ElementSize;
- }
- return;
- }
-
- std::cerr << "Offending constant: " << Init << "\n";
- assert(0 && "Don't know how to emit this constant to memory!");
-}
+++ /dev/null
-LEVEL = ../..
-TOOLNAME = jello
-USEDLIBS = bcreader vmcore codegen x86 support.a target.a scalaropts.a
-
-# Have gcc tell the linker to export symbols from the program so that
-# dynamically loaded modules can be linked against them.
-#
-TOOLLINKOPTS = -ldl
-
-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;
-}
-
-/// 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 << ExeName << ": 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 << ExeName << ": target '" << TM.getName()
- << "' doesn't support machine code emission!\n";
- abort();
- }
-}
-
-int VM::run(Function *F) {
- int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
- assert(PF != 0 && "Null pointer to function?");
-
- unsigned NumArgs = 0;
- for (; Argv[NumArgs]; ++NumArgs)
- ;
-
- return PF(NumArgs, Argv);
-}
-
-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();
-}
-
-// getPointerToGlobal - This returns the address of the specified global
-// value. This may involve code generation if it's a function.
-//
-void *VM::getPointerToGlobal(GlobalValue *GV) {
- if (Function *F = dyn_cast<Function>(GV))
- return getPointerToFunction(F);
-
- assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
- return GlobalAddress[GV];
-}
-
-
-static void NoopFn() {}
-
-/// getPointerToFunction - This method is used to get the address of the
-/// specified function, compiling it if neccesary.
-///
-void *VM::getPointerToFunction(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(M);
-
- assert(Addr && "Code generation didn't add function to GlobalAddress table!");
- return Addr;
-}
+++ /dev/null
-//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
-//
-// This file defines the top level Virtual Machine data structure.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef VM_H
-#define VM_H
-
-#include "llvm/PassManager.h"
-#include <string>
-#include <map>
-#include <vector>
-
-class Function;
-class GlobalValue;
-class Constant;
-class TargetMachine;
-class MachineCodeEmitter;
-
-class VM {
- std::string ExeName;
- Module &M; // The LLVM program we are running
- TargetMachine &TM; // The current target we are compiling to
- PassManager PM; // Passes to compile a function
- MachineCodeEmitter *MCE; // MCE object
- char **Argv;
-
- // GlobalAddress - A mapping between LLVM values and their native code
- // generated versions...
- std::map<const GlobalValue*, void *> GlobalAddress;
-
- // FunctionRefs - A mapping between addresses that refer to unresolved
- // functions and the LLVM function object itself. This is used by the fault
- // handler to lazily patch up references...
- //
- std::map<void*, Function*> FunctionRefs;
-public:
- VM(const std::string &name, char **AV, Module &m, TargetMachine &tm)
- : ExeName(name), M(m), TM(tm), Argv(AV) {
- MCE = createEmitter(*this); // Initialize MCE
- setupPassManager();
- registerCallback();
- emitGlobals();
- }
-
- ~VM();
-
- int run(Function *F);
-
- void addGlobalMapping(const Function *F, void *Addr) {
- void *&CurVal = GlobalAddress[(const GlobalValue*)F];
- assert(CurVal == 0 && "GlobalMapping already established!");
- CurVal = Addr;
- }
-
- void addFunctionRef(void *Ref, Function *F) {
- FunctionRefs[Ref] = F;
- }
-
- const std::string &getFunctionReferencedName(void *RefAddr);
-
- void *resolveFunctionReference(void *RefAddr);
-
- // getPointerToGlobal - This returns the address of the specified global
- // value. This may involve code generation if it's a function.
- //
- void *getPointerToGlobal(GlobalValue *GV);
-
-private:
- static MachineCodeEmitter *createEmitter(VM &V);
- void setupPassManager();
- void *getPointerToFunction(Function *F);
- void registerCallback();
- void emitGlobals();
- void emitConstantToMemory(Constant *Init, void *Addr);
-};
-
-#endif
+++ /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 "llvm/Module.h"
-#include "llvm/Bytecode/Reader.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineImpls.h"
-#include "Support/CommandLine.h"
-#include "VM.h"
-#include <memory>
-
-namespace {
- cl::opt<std::string>
- InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
-
- cl::list<std::string>
- InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
-
- cl::opt<std::string>
- MainFunction("f", cl::desc("Function to execute"), cl::init("main"),
- cl::value_desc("function name"));
-}
-
-//===----------------------------------------------------------------------===//
-// main Driver function
-//
-int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm just in time compiler\n");
-
- // Allocate a target... in the future this will be controllable on the
- // command line.
- std::auto_ptr<TargetMachine> Target(
- allocateX86TargetMachine(TM::PtrSize64 | TM::BigEndian));
- assert(Target.get() && "Could not allocate target machine!");
-
- // Parse the input bytecode file...
- std::string ErrorMsg;
- std::auto_ptr<Module> M(ParseBytecodeFile(InputFile, &ErrorMsg));
- if (M.get() == 0) {
- std::cerr << argv[0] << ": bytecode '" << InputFile
- << "' didn't read correctly: << " << ErrorMsg << "\n";
- return 1;
- }
-
- // Build an argv vector...
- InputArgv.insert(InputArgv.begin(), InputFile);
- char **Argv = new char*[InputArgv.size()+1];
- for (unsigned i = 0, e = InputArgv.size(); i != e; ++i) {
- Argv[i] = new char[InputArgv[i].size()+1];
- std::copy(InputArgv[i].begin(), InputArgv[i].end(), Argv[i]);
- Argv[i][InputArgv[i].size()] = 0;
- }
- Argv[InputArgv.size()] = 0;
-
- // Create the virtual machine object...
- VM TheVM(argv[0], Argv, *M.get(), *Target.get());
-
- Function *F = M.get()->getNamedFunction(MainFunction);
- if (F == 0) {
- std::cerr << "Could not find function '" << MainFunction <<"' in module!\n";
- return 1;
- }
-
- // Run the virtual machine...
- return TheVM.run(F);
-}
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