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if (!gep_inst)
{
if (log)
log->Printf("getOpcode() returns GetElementPtr, but instruction is not a GetElementPtrInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
const Value *pointer_operand = gep_inst->getPointerOperand();
Type *pointer_type = pointer_operand->getType();
lldb_private::Scalar P;
if (!frame.EvaluateValue(P, pointer_operand, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(pointer_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
typedef SmallVector <Value *, 8> IndexVector;
typedef IndexVector::iterator IndexIterator;
SmallVector <Value *, 8> indices (gep_inst->idx_begin(),
gep_inst->idx_end());
SmallVector <Value *, 8> const_indices;
for (IndexIterator ii = indices.begin(), ie = indices.end();
ii != ie;
++ii)
{
ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii);
if (!constant_index)
{
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, *ii, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (log)
log->Printf("Evaluated constant index %s as %llu", PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS));
constant_index = cast<ConstantInt>(ConstantInt::get((*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS)));
}
const_indices.push_back(constant_index);
}
uint64_t offset = data_layout.getIndexedOffset(pointer_type, const_indices);
lldb_private::Scalar Poffset = P + offset;
frame.AssignValue(inst, Poffset, module);
if (log)
{
log->Printf("Interpreted a GetElementPtrInst");
log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str());
log->Printf(" Poffset : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::ICmp:
{
const ICmpInst *icmp_inst = dyn_cast<ICmpInst>(inst);
if (!icmp_inst)
{
if (log)
log->Printf("getOpcode() returns ICmp, but instruction is not an ICmpInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
CmpInst::Predicate predicate = icmp_inst->getPredicate();
Value *lhs = inst->getOperand(0);
Value *rhs = inst->getOperand(1);
lldb_private::Scalar L;
lldb_private::Scalar R;
if (!frame.EvaluateValue(L, lhs, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb_private::Scalar result;
switch (predicate)
{
default:
return false;
case CmpInst::ICMP_EQ:
result = (L == R);
break;
case CmpInst::ICMP_NE:
result = (L != R);
break;
case CmpInst::ICMP_UGT:
result = (L.GetRawBits64(0) > R.GetRawBits64(0));
break;
case CmpInst::ICMP_UGE:
result = (L.GetRawBits64(0) >= R.GetRawBits64(0));
break;
case CmpInst::ICMP_ULT:
result = (L.GetRawBits64(0) < R.GetRawBits64(0));
break;
case CmpInst::ICMP_ULE:
result = (L.GetRawBits64(0) <= R.GetRawBits64(0));
break;
case CmpInst::ICMP_SGT:
L.MakeSigned();
R.MakeSigned();
result = (L > R);
break;
case CmpInst::ICMP_SGE:
L.MakeSigned();
R.MakeSigned();
result = (L >= R);
break;
case CmpInst::ICMP_SLT:
L.MakeSigned();
R.MakeSigned();
result = (L < R);
break;
case CmpInst::ICMP_SLE:
L.MakeSigned();
R.MakeSigned();
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result = (L <= R);
break;
}
frame.AssignValue(inst, result, module);
if (log)
{
log->Printf("Interpreted an ICmpInst");
log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str());
log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::IntToPtr:
{
const IntToPtrInst *int_to_ptr_inst = dyn_cast<IntToPtrInst>(inst);
if (!int_to_ptr_inst)
{
if (log)
log->Printf("getOpcode() returns IntToPtr, but instruction is not an IntToPtrInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *src_operand = int_to_ptr_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log)
{
log->Printf("Interpreted an IntToPtr");
log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str());
log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::PtrToInt:
{
const PtrToIntInst *ptr_to_int_inst = dyn_cast<PtrToIntInst>(inst);
if (!ptr_to_int_inst)
{
if (log)
log->Printf("getOpcode() returns PtrToInt, but instruction is not an PtrToIntInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *src_operand = ptr_to_int_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log)
{
log->Printf("Interpreted a PtrToInt");
log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str());
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log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::Trunc:
{
const TruncInst *trunc_inst = dyn_cast<TruncInst>(inst);
if (!trunc_inst)
{
if (log)
log->Printf("getOpcode() returns Trunc, but instruction is not a TruncInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Value *src_operand = trunc_inst->getOperand(0);
lldb_private::Scalar I;
if (!frame.EvaluateValue(I, src_operand, module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str());
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, module);
if (log)
{
log->Printf("Interpreted a Trunc");
log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str());
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log->Printf(" = : %s", frame.SummarizeValue(inst).c_str());
}
}
break;
case Instruction::Load:
{
const LoadInst *load_inst = dyn_cast<LoadInst>(inst);
if (!load_inst)
{
if (log)
log->Printf("getOpcode() returns Load, but instruction is not a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
// The semantics of Load are:
// Create a region D that will contain the loaded data
// Resolve the region P containing a pointer
// Dereference P to get the region R that the data should be loaded from
// Transfer a unit of type type(D) from R to D
const Value *pointer_operand = load_inst->getPointerOperand();
Type *pointer_ty = pointer_operand->getType();
PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty);
if (!pointer_ptr_ty)
{
if (log)
log->Printf("getPointerOperand()->getType() is not a PointerType");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
Type *target_ty = pointer_ptr_ty->getElementType();
lldb::addr_t D = frame.ResolveValue(load_inst, module);
lldb::addr_t P = frame.ResolveValue(pointer_operand, module);
if (D == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("LoadInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("LoadInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Error read_error;
memory_map.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read the address to be loaded for a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
size_t target_size = data_layout.getTypeStoreSize(target_ty);
lldb_private::DataBufferHeap buffer(target_size, 0);
read_error.Clear();
memory_map.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read from a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Error write_error;
memory_map.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), write_error);
if (!write_error.Success())
{
if (log)
log->Printf("Couldn't write to a region on behalf of a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
if (log)
{
log->Printf("Interpreted a LoadInst");
log->Printf(" P : 0x%" PRIx64, P);
log->Printf(" R : 0x%" PRIx64, R);
log->Printf(" D : 0x%" PRIx64, D);
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}
}
break;
case Instruction::Ret:
{
return true;
}
case Instruction::Store:
{
const StoreInst *store_inst = dyn_cast<StoreInst>(inst);
if (!store_inst)
{
if (log)
log->Printf("getOpcode() returns Store, but instruction is not a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(interpreter_internal_error);
return false;
}
// The semantics of Store are:
// Resolve the region D containing the data to be stored
// Resolve the region P containing a pointer
// Dereference P to get the region R that the data should be stored in
// Transfer a unit of type type(D) from D to R
const Value *value_operand = store_inst->getValueOperand();
const Value *pointer_operand = store_inst->getPointerOperand();
Type *pointer_ty = pointer_operand->getType();
PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty);
if (!pointer_ptr_ty)
return false;
Type *target_ty = pointer_ptr_ty->getElementType();
lldb::addr_t D = frame.ResolveValue(value_operand, module);
lldb::addr_t P = frame.ResolveValue(pointer_operand, module);
if (D == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("StoreInst's value doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
if (P == LLDB_INVALID_ADDRESS)
{
if (log)
log->Printf("StoreInst's pointer doesn't resolve to anything");
error.SetErrorToGenericError();
error.SetErrorString(bad_value_error);
return false;
}
lldb::addr_t R;
lldb_private::Error read_error;
memory_map.ReadPointerFromMemory(&R, P, read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read the address to be loaded for a LoadInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
size_t target_size = data_layout.getTypeStoreSize(target_ty);
lldb_private::DataBufferHeap buffer(target_size, 0);
read_error.Clear();
memory_map.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), read_error);
if (!read_error.Success())
{
if (log)
log->Printf("Couldn't read from a region on behalf of a StoreInst");
error.SetErrorToGenericError();
error.SetErrorString(memory_read_error);
return false;
}
lldb_private::Error write_error;
memory_map.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), write_error);
if (!write_error.Success())
{
if (log)
log->Printf("Couldn't write to a region on behalf of a StoreInst");
error.SetErrorToGenericError();
return false;
}
if (log)
{
log->Printf("Interpreted a StoreInst");
log->Printf(" D : 0x%" PRIx64, D);
log->Printf(" P : 0x%" PRIx64, P);
log->Printf(" R : 0x%" PRIx64, R);
}
}
break;
}
++frame.m_ii;
}
if (num_insts >= 4096)
{
error.SetErrorToGenericError();
error.SetErrorString(infinite_loop_error);
return false;
}
return false;
}