mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
df5a37efc9
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18357 91177308-0d34-0410-b5e6-96231b3b80d8
548 lines
22 KiB
C++
548 lines
22 KiB
C++
//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the common interface used by the various execution engine
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// subclasses.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "Interpreter/Interpreter.h"
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#include "JIT/JIT.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/System/DynamicLibrary.h"
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#include "llvm/Target/TargetData.h"
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using namespace llvm;
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namespace {
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Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
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Statistic<> NumGlobals ("lli", "Number of global vars initialized");
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}
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ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
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CurMod(*P->getModule()), MP(P) {
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assert(P && "ModuleProvider is null?");
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}
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ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
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assert(M && "Module is null?");
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}
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ExecutionEngine::~ExecutionEngine() {
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delete MP;
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}
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/// getGlobalValueAtAddress - Return the LLVM global value object that starts
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/// at the specified address.
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///
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const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
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// If we haven't computed the reverse mapping yet, do so first.
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if (GlobalAddressReverseMap.empty()) {
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for (std::map<const GlobalValue*, void *>::iterator I =
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GlobalAddressMap.begin(), E = GlobalAddressMap.end(); I != E; ++I)
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GlobalAddressReverseMap.insert(std::make_pair(I->second, I->first));
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}
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std::map<void *, const GlobalValue*>::iterator I =
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GlobalAddressReverseMap.find(Addr);
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return I != GlobalAddressReverseMap.end() ? I->second : 0;
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}
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// CreateArgv - Turn a vector of strings into a nice argv style array of
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// pointers to null terminated strings.
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//
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static void *CreateArgv(ExecutionEngine *EE,
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const std::vector<std::string> &InputArgv) {
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unsigned PtrSize = EE->getTargetData().getPointerSize();
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char *Result = new char[(InputArgv.size()+1)*PtrSize];
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DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
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const Type *SBytePtr = PointerType::get(Type::SByteTy);
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for (unsigned i = 0; i != InputArgv.size(); ++i) {
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unsigned Size = InputArgv[i].size()+1;
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char *Dest = new char[Size];
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DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
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std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
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Dest[Size-1] = 0;
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// Endian safe: Result[i] = (PointerTy)Dest;
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EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
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SBytePtr);
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}
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// Null terminate it
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EE->StoreValueToMemory(PTOGV(0),
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(GenericValue*)(Result+InputArgv.size()*PtrSize),
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SBytePtr);
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return Result;
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}
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/// runFunctionAsMain - This is a helper function which wraps runFunction to
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/// handle the common task of starting up main with the specified argc, argv,
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/// and envp parameters.
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int ExecutionEngine::runFunctionAsMain(Function *Fn,
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const std::vector<std::string> &argv,
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const char * const * envp) {
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std::vector<GenericValue> GVArgs;
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GenericValue GVArgc;
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GVArgc.IntVal = argv.size();
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unsigned NumArgs = Fn->getFunctionType()->getNumParams();
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if (NumArgs) {
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GVArgs.push_back(GVArgc); // Arg #0 = argc.
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if (NumArgs > 1) {
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GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
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assert(((char **)GVTOP(GVArgs[1]))[0] &&
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"argv[0] was null after CreateArgv");
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if (NumArgs > 2) {
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std::vector<std::string> EnvVars;
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for (unsigned i = 0; envp[i]; ++i)
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EnvVars.push_back(envp[i]);
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GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
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}
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}
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}
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return runFunction(Fn, GVArgs).IntVal;
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}
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/// If possible, create a JIT, unless the caller specifically requests an
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/// Interpreter or there's an error. If even an Interpreter cannot be created,
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/// NULL is returned.
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///
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ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
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bool ForceInterpreter,
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IntrinsicLowering *IL) {
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ExecutionEngine *EE = 0;
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// Unless the interpreter was explicitly selected, try making a JIT.
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if (!ForceInterpreter)
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EE = JIT::create(MP, IL);
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// If we can't make a JIT, make an interpreter instead.
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if (EE == 0) {
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try {
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Module *M = MP->materializeModule();
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try {
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EE = Interpreter::create(M, IL);
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} catch (...) {
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std::cerr << "Error creating the interpreter!\n";
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}
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} catch (std::string& errmsg) {
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std::cerr << "Error reading the bytecode file: " << errmsg << "\n";
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} catch (...) {
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std::cerr << "Error reading the bytecode file!\n";
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}
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}
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if (EE == 0)
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delete IL;
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else
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// Make sure we can resolve symbols in the program as well. The zero arg
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// to the function tells DynamicLibrary to load the program, not a library.
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sys::DynamicLibrary::LoadLibraryPermanently(0);
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return EE;
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}
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/// getPointerToGlobal - This returns the address of the specified global
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/// value. This may involve code generation if it's a function.
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///
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void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
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if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
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return getPointerToFunction(F);
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assert(GlobalAddressMap[GV] && "Global hasn't had an address allocated yet?");
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return GlobalAddressMap[GV];
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}
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/// FIXME: document
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///
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GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
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GenericValue Result;
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if (isa<UndefValue>(C)) return Result;
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if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
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switch (CE->getOpcode()) {
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case Instruction::GetElementPtr: {
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Result = getConstantValue(CE->getOperand(0));
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std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
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uint64_t Offset =
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TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
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Result.LongVal += Offset;
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return Result;
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}
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case Instruction::Cast: {
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// We only need to handle a few cases here. Almost all casts will
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// automatically fold, just the ones involving pointers won't.
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//
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Constant *Op = CE->getOperand(0);
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GenericValue GV = getConstantValue(Op);
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// Handle cast of pointer to pointer...
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if (Op->getType()->getTypeID() == C->getType()->getTypeID())
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return GV;
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// Handle a cast of pointer to any integral type...
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if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
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return GV;
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// Handle cast of integer to a pointer...
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if (isa<PointerType>(C->getType()) && Op->getType()->isIntegral())
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switch (Op->getType()->getTypeID()) {
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case Type::BoolTyID: return PTOGV((void*)(uintptr_t)GV.BoolVal);
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case Type::SByteTyID: return PTOGV((void*)( intptr_t)GV.SByteVal);
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case Type::UByteTyID: return PTOGV((void*)(uintptr_t)GV.UByteVal);
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case Type::ShortTyID: return PTOGV((void*)( intptr_t)GV.ShortVal);
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case Type::UShortTyID: return PTOGV((void*)(uintptr_t)GV.UShortVal);
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case Type::IntTyID: return PTOGV((void*)( intptr_t)GV.IntVal);
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case Type::UIntTyID: return PTOGV((void*)(uintptr_t)GV.UIntVal);
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case Type::LongTyID: return PTOGV((void*)( intptr_t)GV.LongVal);
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case Type::ULongTyID: return PTOGV((void*)(uintptr_t)GV.ULongVal);
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default: assert(0 && "Unknown integral type!");
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}
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break;
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}
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case Instruction::Add:
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switch (CE->getOperand(0)->getType()->getTypeID()) {
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default: assert(0 && "Bad add type!"); abort();
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case Type::LongTyID:
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case Type::ULongTyID:
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Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
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getConstantValue(CE->getOperand(1)).LongVal;
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break;
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case Type::IntTyID:
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case Type::UIntTyID:
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Result.IntVal = getConstantValue(CE->getOperand(0)).IntVal +
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getConstantValue(CE->getOperand(1)).IntVal;
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break;
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case Type::ShortTyID:
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case Type::UShortTyID:
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Result.ShortVal = getConstantValue(CE->getOperand(0)).ShortVal +
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getConstantValue(CE->getOperand(1)).ShortVal;
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break;
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case Type::SByteTyID:
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case Type::UByteTyID:
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Result.SByteVal = getConstantValue(CE->getOperand(0)).SByteVal +
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getConstantValue(CE->getOperand(1)).SByteVal;
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break;
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case Type::FloatTyID:
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Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
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getConstantValue(CE->getOperand(1)).FloatVal;
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break;
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case Type::DoubleTyID:
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Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
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getConstantValue(CE->getOperand(1)).DoubleVal;
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break;
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}
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return Result;
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default:
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break;
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}
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std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
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abort();
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}
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switch (C->getType()->getTypeID()) {
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#define GET_CONST_VAL(TY, CLASS) \
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case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
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GET_CONST_VAL(Bool , ConstantBool);
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GET_CONST_VAL(UByte , ConstantUInt);
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GET_CONST_VAL(SByte , ConstantSInt);
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GET_CONST_VAL(UShort , ConstantUInt);
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GET_CONST_VAL(Short , ConstantSInt);
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GET_CONST_VAL(UInt , ConstantUInt);
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GET_CONST_VAL(Int , ConstantSInt);
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GET_CONST_VAL(ULong , ConstantUInt);
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GET_CONST_VAL(Long , ConstantSInt);
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GET_CONST_VAL(Float , ConstantFP);
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GET_CONST_VAL(Double , ConstantFP);
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#undef GET_CONST_VAL
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case Type::PointerTyID:
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if (isa<ConstantPointerNull>(C))
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Result.PointerVal = 0;
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else if (const Function *F = dyn_cast<Function>(C))
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Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
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else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
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Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
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else
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assert(0 && "Unknown constant pointer type!");
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break;
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default:
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std::cout << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
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abort();
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}
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return Result;
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}
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/// FIXME: document
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///
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void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
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const Type *Ty) {
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if (getTargetData().isLittleEndian()) {
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switch (Ty->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
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case Type::UShortTyID:
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case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
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Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
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break;
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Store4BytesLittleEndian:
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case Type::FloatTyID:
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case Type::UIntTyID:
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case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
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Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
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Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
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Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
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break;
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case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
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goto Store4BytesLittleEndian;
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case Type::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
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Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
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Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
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Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
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Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
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Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
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Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
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Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
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break;
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default:
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std::cout << "Cannot store value of type " << *Ty << "!\n";
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}
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} else {
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switch (Ty->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
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case Type::UShortTyID:
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case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
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Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
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break;
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Store4BytesBigEndian:
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case Type::FloatTyID:
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case Type::UIntTyID:
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case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
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Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
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Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
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Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
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break;
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case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
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goto Store4BytesBigEndian;
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case Type::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
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Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
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Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
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Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
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Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
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Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
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Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
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Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
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break;
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default:
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std::cout << "Cannot store value of type " << *Ty << "!\n";
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}
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}
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}
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/// FIXME: document
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///
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GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
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const Type *Ty) {
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GenericValue Result;
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if (getTargetData().isLittleEndian()) {
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switch (Ty->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
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case Type::UShortTyID:
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case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
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((unsigned)Ptr->Untyped[1] << 8);
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break;
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Load4BytesLittleEndian:
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case Type::FloatTyID:
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case Type::UIntTyID:
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case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
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((unsigned)Ptr->Untyped[1] << 8) |
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((unsigned)Ptr->Untyped[2] << 16) |
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((unsigned)Ptr->Untyped[3] << 24);
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break;
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case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
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goto Load4BytesLittleEndian;
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case Type::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
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((uint64_t)Ptr->Untyped[1] << 8) |
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((uint64_t)Ptr->Untyped[2] << 16) |
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((uint64_t)Ptr->Untyped[3] << 24) |
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((uint64_t)Ptr->Untyped[4] << 32) |
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((uint64_t)Ptr->Untyped[5] << 40) |
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((uint64_t)Ptr->Untyped[6] << 48) |
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((uint64_t)Ptr->Untyped[7] << 56);
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break;
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default:
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std::cout << "Cannot load value of type " << *Ty << "!\n";
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abort();
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}
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} else {
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switch (Ty->getTypeID()) {
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case Type::BoolTyID:
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case Type::UByteTyID:
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case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
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case Type::UShortTyID:
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case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
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((unsigned)Ptr->Untyped[0] << 8);
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break;
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Load4BytesBigEndian:
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case Type::FloatTyID:
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case Type::UIntTyID:
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case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
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((unsigned)Ptr->Untyped[2] << 8) |
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((unsigned)Ptr->Untyped[1] << 16) |
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((unsigned)Ptr->Untyped[0] << 24);
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break;
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case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
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goto Load4BytesBigEndian;
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case Type::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
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((uint64_t)Ptr->Untyped[6] << 8) |
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((uint64_t)Ptr->Untyped[5] << 16) |
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((uint64_t)Ptr->Untyped[4] << 24) |
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((uint64_t)Ptr->Untyped[3] << 32) |
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((uint64_t)Ptr->Untyped[2] << 40) |
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((uint64_t)Ptr->Untyped[1] << 48) |
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((uint64_t)Ptr->Untyped[0] << 56);
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break;
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default:
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std::cout << "Cannot load value of type " << *Ty << "!\n";
|
|
abort();
|
|
}
|
|
}
|
|
return Result;
|
|
}
|
|
|
|
// InitializeMemory - Recursive function to apply a Constant value into the
|
|
// specified memory location...
|
|
//
|
|
void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
|
|
if (isa<UndefValue>(Init)) {
|
|
// FIXME: THIS SHOULD NOT BE NEEDED.
|
|
unsigned Size = getTargetData().getTypeSize(Init->getType());
|
|
memset(Addr, 0, Size);
|
|
return;
|
|
} else if (Init->getType()->isFirstClassType()) {
|
|
GenericValue Val = getConstantValue(Init);
|
|
StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
|
|
return;
|
|
} else if (isa<ConstantAggregateZero>(Init)) {
|
|
unsigned Size = getTargetData().getTypeSize(Init->getType());
|
|
memset(Addr, 0, Size);
|
|
return;
|
|
}
|
|
|
|
switch (Init->getType()->getTypeID()) {
|
|
case Type::ArrayTyID: {
|
|
const ConstantArray *CPA = cast<ConstantArray>(Init);
|
|
unsigned ElementSize =
|
|
getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
|
|
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
|
|
InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
|
|
return;
|
|
}
|
|
|
|
case Type::StructTyID: {
|
|
const ConstantStruct *CPS = cast<ConstantStruct>(Init);
|
|
const StructLayout *SL =
|
|
getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
|
|
for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
|
|
InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
|
|
return;
|
|
}
|
|
|
|
default:
|
|
std::cerr << "Bad Type: " << *Init->getType() << "\n";
|
|
assert(0 && "Unknown constant type to initialize memory with!");
|
|
}
|
|
}
|
|
|
|
/// 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);
|
|
addGlobalMapping(I, new char[Size]);
|
|
} else {
|
|
// External variable reference. Try to use the dynamic loader to
|
|
// get a pointer to it.
|
|
if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
|
|
I->getName().c_str()))
|
|
addGlobalMapping(I, SymAddr);
|
|
else {
|
|
std::cerr << "Could not resolve external global address: "
|
|
<< I->getName() << "\n";
|
|
abort();
|
|
}
|
|
}
|
|
|
|
// 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())
|
|
EmitGlobalVariable(I);
|
|
}
|
|
|
|
// EmitGlobalVariable - This method emits the specified global variable to the
|
|
// address specified in GlobalAddresses, or allocates new memory if it's not
|
|
// already in the map.
|
|
void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
|
|
void *GA = getPointerToGlobalIfAvailable(GV);
|
|
DEBUG(std::cerr << "Global '" << GV->getName() << "' -> " << GA << "\n");
|
|
|
|
const Type *ElTy = GV->getType()->getElementType();
|
|
unsigned GVSize = getTargetData().getTypeSize(ElTy);
|
|
if (GA == 0) {
|
|
// If it's not already specified, allocate memory for the global.
|
|
GA = new char[GVSize];
|
|
addGlobalMapping(GV, GA);
|
|
}
|
|
|
|
InitializeMemory(GV->getInitializer(), GA);
|
|
NumInitBytes += GVSize;
|
|
++NumGlobals;
|
|
}
|