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https://github.com/c64scene-ar/llvm-6502.git
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d8c03bfa0a
* Implement GetElementPtr constant expressions when initializing global variables git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5880 91177308-0d34-0410-b5e6-96231b3b80d8
256 lines
9.4 KiB
C++
256 lines
9.4 KiB
C++
//===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
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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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#include "ExecutionEngine.h"
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#include "GenericValue.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/Target/TargetData.h"
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#include "Support/Statistic.h"
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#include <dlfcn.h>
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Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
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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 (const Function *F = 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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GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
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GenericValue Result;
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if (ConstantExpr *CE = (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(cast<Constant>(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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default:
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std::cerr << "ConstantExpr not handled as global var init: " << *CE
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<< "\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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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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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::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID:
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case Type::PointerTyID: 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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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::DoubleTyID:
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case Type::ULongTyID:
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case Type::LongTyID:
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case Type::PointerTyID: 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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// 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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void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
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// Pointers are 64 bits...
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// FIXME: Assumes 64 bit target
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PointerTy *Result = new PointerTy[InputArgv.size()+1];
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DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
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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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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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StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
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Type::LongTy); // 64 bit assumption
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}
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Result[InputArgv.size()] = 0;
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return Result;
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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 dlsym to get a pointer to it in
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// the LLI image.
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if (void *SymAddr = dlsym(0, 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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