mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-10-31 08:16:47 +00:00
20a277e162
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9488 91177308-0d34-0410-b5e6-96231b3b80d8
393 lines
15 KiB
C++
393 lines
15 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/VM.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/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/Target/TargetData.h"
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#include "Support/Debug.h"
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#include "Support/Statistic.h"
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#include "Support/DynamicLinker.h"
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#include "Config/dlfcn.h"
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Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
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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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/// 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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ExecutionEngine *EE = 0;
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// Unless the interpreter was explicitly selected, make a JIT.
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if (!ForceInterpreter)
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EE = VM::create(MP);
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// If we can't make a JIT, make an interpreter instead.
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try {
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if (EE == 0)
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EE = Interpreter::create(MP->materializeModule());
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} catch (...) {
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EE = 0;
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}
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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(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
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return GlobalAddress[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 (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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// Handle cast of pointer to pointer...
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if (Op->getType()->getPrimitiveID() == C->getType()->getPrimitiveID())
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return getConstantValue(Op);
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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 getConstantValue(Op);
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// Handle cast of long to pointer...
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if (isa<PointerType>(C->getType()) && (Op->getType() == Type::LongTy ||
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Op->getType() == Type::ULongTy))
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return getConstantValue(Op);
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break;
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}
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case Instruction::Add:
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if (CE->getOperand(0)->getType() == Type::LongTy ||
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CE->getOperand(0)->getType() == Type::ULongTy)
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Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
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getConstantValue(CE->getOperand(1)).LongVal;
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else
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break;
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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()->getPrimitiveID()) {
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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 ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
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Result = PTOGV(getPointerToGlobal(CPR->getValue()));
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} else {
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assert(0 && "Unknown constant pointer type!");
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}
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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->getPrimitiveID()) {
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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->getPrimitiveID()) {
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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->getPrimitiveID()) {
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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->getPrimitiveID()) {
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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";
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abort();
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}
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}
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return Result;
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}
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// InitializeMemory - Recursive function to apply a Constant value into the
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// specified memory location...
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//
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void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
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if (Init->getType()->isFirstClassType()) {
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GenericValue Val = getConstantValue(Init);
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StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
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return;
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}
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switch (Init->getType()->getPrimitiveID()) {
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case Type::ArrayTyID: {
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const ConstantArray *CPA = cast<ConstantArray>(Init);
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const std::vector<Use> &Val = CPA->getValues();
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unsigned ElementSize =
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getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
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for (unsigned i = 0; i < Val.size(); ++i)
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InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
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return;
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}
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case Type::StructTyID: {
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const ConstantStruct *CPS = cast<ConstantStruct>(Init);
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const StructLayout *SL =
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getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
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const std::vector<Use> &Val = CPS->getValues();
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for (unsigned i = 0; i < Val.size(); ++i)
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InitializeMemory(cast<Constant>(Val[i].get()),
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(char*)Addr+SL->MemberOffsets[i]);
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return;
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}
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default:
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std::cerr << "Bad Type: " << Init->getType() << "\n";
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assert(0 && "Unknown constant type to initialize memory with!");
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}
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}
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/// EmitGlobals - Emit all of the global variables to memory, storing their
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/// addresses into GlobalAddress. This must make sure to copy the contents of
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/// their initializers into the memory.
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///
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void ExecutionEngine::emitGlobals() {
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const TargetData &TD = getTargetData();
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// Loop over all of the global variables in the program, allocating the memory
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// to hold them.
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for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
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I != E; ++I)
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if (!I->isExternal()) {
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// Get the type of the global...
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const Type *Ty = I->getType()->getElementType();
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// Allocate some memory for it!
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unsigned Size = TD.getTypeSize(Ty);
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GlobalAddress[I] = new char[Size];
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NumInitBytes += Size;
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DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
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<< (void*)GlobalAddress[I] << "\n");
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} else {
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// External variable reference. Try to use the dynamic loader to
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// get a pointer to it.
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if (void *SymAddr = GetAddressOfSymbol(I->getName().c_str()))
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GlobalAddress[I] = SymAddr;
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else {
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std::cerr << "Could not resolve external global address: "
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<< I->getName() << "\n";
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abort();
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}
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}
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// Now that all of the globals are set up in memory, loop through them all and
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// initialize their contents.
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for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
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I != E; ++I)
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if (!I->isExternal())
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InitializeMemory(I->getInitializer(), GlobalAddress[I]);
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}
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