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err.SetErrorString(interpreter_initialization_error);
if (target_data.isLittleEndian() != (target_info.byte_order == lldb::eByteOrderLittle))
{
err.SetErrorToGenericError();
err.SetErrorString(interpreter_initialization_error);
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Memory memory(target_data, m_decl_map, alloc_min, alloc_max);
InterpreterStackFrame frame(target_data, memory, m_decl_map);
uint32_t num_insts = 0;
frame.Jump(llvm_function.begin());
while (frame.m_ii != frame.m_ie && (++num_insts < 4096))
{
const Instruction *inst = frame.m_ii;
if (log)
log->Printf("Interpreting %s", PrintValue(inst).c_str());
switch (inst->getOpcode())
{
default:
break;
case Instruction::Add:
case Instruction::Sub:
case Instruction::Mul:
case Instruction::SDiv:
case Instruction::UDiv:
{
const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst);
if (!bin_op)
{
if (log)
log->Printf("getOpcode() returns %s, but instruction is not a BinaryOperator", inst->getOpcodeName());
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
return false;
}
Value *lhs = inst->getOperand(0);
Value *rhs = inst->getOperand(1);
lldb_private::Scalar L;
lldb_private::Scalar R;
if (!frame.EvaluateValue(L, lhs, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
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return false;
}
lldb_private::Scalar result;
switch (inst->getOpcode())
{
default:
break;
case Instruction::Add:
result = L + R;
break;
case Instruction::Mul:
result = L * R;
break;
case Instruction::Sub:
result = L - R;
break;
case Instruction::SDiv:
result = L / R;
break;
case Instruction::UDiv:
result = L.GetRawBits64(0) / R.GetRawBits64(1);
break;
}
frame.AssignValue(inst, result, llvm_module);
if (log)
{
log->Printf("Interpreted a %s", inst->getOpcodeName());
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::Alloca:
{
const AllocaInst *alloca_inst = dyn_cast<AllocaInst>(inst);
if (!alloca_inst)
{
if (log)
log->Printf("getOpcode() returns Alloca, but instruction is not an AllocaInst");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
return false;
}
if (alloca_inst->isArrayAllocation())
{
if (log)
log->Printf("AllocaInsts are not handled if isArrayAllocation() is true");
err.SetErrorToGenericError();
err.SetErrorString(unsupported_opcode_error);
return false;
}
// The semantics of Alloca are:
// Create a region R of virtual memory of type T, backed by a data buffer
// Create a region P of virtual memory of type T*, backed by a data buffer
// Write the virtual address of R into P
Type *T = alloca_inst->getAllocatedType();
Type *Tptr = alloca_inst->getType();
Memory::Region R = memory.Malloc(T);
if (R.IsInvalid())
{
if (log)
log->Printf("Couldn't allocate memory for an AllocaInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_allocation_error);
return false;
}
Memory::Region P = memory.Malloc(Tptr);
if (P.IsInvalid())
{
if (log)
log->Printf("Couldn't allocate the result pointer for an AllocaInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_allocation_error);
return false;
}
DataEncoderSP P_encoder = memory.GetEncoder(P);
if (P_encoder->PutAddress(0, R.m_base) == UINT32_MAX)
{
if (log)
log->Printf("Couldn't write the result pointer for an AllocaInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_write_error);
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return false;
}
frame.m_values[alloca_inst] = P;
if (log)
{
log->Printf("Interpreted an AllocaInst");
log->Printf(" R : %s", memory.SummarizeRegion(R).c_str());
log->Printf(" P : %s", frame.SummarizeValue(alloca_inst).c_str());
}
}
break;
case Instruction::BitCast:
{
const BitCastInst *bit_cast_inst = dyn_cast<BitCastInst>(inst);
if (!bit_cast_inst)
{
if (log)
log->Printf("getOpcode() returns BitCast, but instruction is not a BitCastInst");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
return false;
}
Value *source = bit_cast_inst->getOperand(0);
lldb_private::Scalar S;
if (!frame.EvaluateValue(S, source, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(source).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, S, llvm_module);
}
break;
case Instruction::Br:
{
const BranchInst *br_inst = dyn_cast<BranchInst>(inst);
if (!br_inst)
{
if (log)
log->Printf("getOpcode() returns Br, but instruction is not a BranchInst");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
return false;
}
if (br_inst->isConditional())
{
Value *condition = br_inst->getCondition();
lldb_private::Scalar C;
if (!frame.EvaluateValue(C, condition, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(condition).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
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return false;
}
if (C.GetRawBits64(0))
frame.Jump(br_inst->getSuccessor(0));
else
frame.Jump(br_inst->getSuccessor(1));
if (log)
{
log->Printf("Interpreted a BrInst with a condition");
log->Printf(" cond : %s", frame.SummarizeValue(condition).c_str());
}
}
else
{
frame.Jump(br_inst->getSuccessor(0));
if (log)
{
log->Printf("Interpreted a BrInst with no condition");
}
}
}
continue;
case Instruction::GetElementPtr:
{
const GetElementPtrInst *gep_inst = dyn_cast<GetElementPtrInst>(inst);
if (!gep_inst)
{
if (log)
log->Printf("getOpcode() returns GetElementPtr, but instruction is not a GetElementPtrInst");
err.SetErrorToGenericError();
err.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, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(pointer_operand).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
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SmallVector <Value *, 8> indices (gep_inst->idx_begin(),
gep_inst->idx_end());
uint64_t offset = target_data.getIndexedOffset(pointer_type, indices);
lldb_private::Scalar Poffset = P + offset;
frame.AssignValue(inst, Poffset, llvm_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");
err.SetErrorToGenericError();
err.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, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
if (!frame.EvaluateValue(R, rhs, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
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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:
result = (L > R);
break;
case CmpInst::ICMP_SGE:
result = (L >= R);
break;
case CmpInst::ICMP_SLT:
result = (L < R);
break;
case CmpInst::ICMP_SLE:
result = (L <= R);
break;
}
frame.AssignValue(inst, result, llvm_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");
err.SetErrorToGenericError();
err.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, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
frame.AssignValue(inst, I, llvm_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::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");
err.SetErrorToGenericError();
err.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");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
Type *target_ty = pointer_ptr_ty->getElementType();
Memory::Region D = frame.ResolveValue(load_inst, llvm_module);
Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module);
if (D.IsInvalid())
{
if (log)
log->Printf("LoadInst's value doesn't resolve to anything");
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
if (P.IsInvalid())
{
if (log)
log->Printf("LoadInst's pointer doesn't resolve to anything");
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
DataExtractorSP P_extractor(memory.GetExtractor(P));
DataEncoderSP D_encoder(memory.GetEncoder(D));
uint32_t offset = 0;
lldb::addr_t pointer = P_extractor->GetAddress(&offset);
Memory::Region R = memory.Lookup(pointer, target_ty);
if (R.IsValid())
{
if (!memory.Read(D_encoder->GetDataStart(), R.m_base, target_data.getTypeStoreSize(target_ty)))
{
if (log)
log->Printf("Couldn't read from a region on behalf of a LoadInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_read_error);
return false;
}
}
else
{
if (!memory.ReadFromRawPtr(D_encoder->GetDataStart(), pointer, target_data.getTypeStoreSize(target_ty)))
{
if (log)
log->Printf("Couldn't read from a raw pointer on behalf of a LoadInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_read_error);
return false;
}
}
if (log)
{
log->Printf("Interpreted a LoadInst");
log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str());
if (R.IsValid())
log->Printf(" R : %s", memory.SummarizeRegion(R).c_str());
else
log->Printf(" R : raw pointer 0x%llx", (unsigned long long)pointer);
log->Printf(" D : %s", frame.SummarizeValue(load_inst).c_str());
}
}
break;
case Instruction::Ret:
{
if (result_name.IsEmpty())
return true;
GlobalValue *result_value = llvm_module.getNamedValue(result_name.GetCString());
return frame.ConstructResult(result, result_value, result_name, result_type, llvm_module);
}
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");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
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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();
Memory::Region D = frame.ResolveValue(value_operand, llvm_module);
Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module);
if (D.IsInvalid())
{
if (log)
log->Printf("StoreInst's value doesn't resolve to anything");
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
if (P.IsInvalid())
{
if (log)
log->Printf("StoreInst's pointer doesn't resolve to anything");
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
DataExtractorSP P_extractor(memory.GetExtractor(P));
DataExtractorSP D_extractor(memory.GetExtractor(D));
if (!P_extractor || !D_extractor)
return false;
uint32_t offset = 0;
lldb::addr_t pointer = P_extractor->GetAddress(&offset);
Memory::Region R = memory.Lookup(pointer, target_ty);
if (!memory.Write(R.m_base, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty)))
{
if (log)
log->Printf("Couldn't write to a region on behalf of a LoadInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_write_error);
return false;
}
}
else
{
if (!memory.WriteToRawPtr(pointer, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty)))
{
if (log)
log->Printf("Couldn't write to a raw pointer on behalf of a LoadInst");
err.SetErrorToGenericError();
err.SetErrorString(memory_write_error);
return false;
}
}
if (log)
{
log->Printf("Interpreted a StoreInst");
log->Printf(" D : %s", frame.SummarizeValue(value_operand).c_str());
log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str());
log->Printf(" R : %s", memory.SummarizeRegion(R).c_str());
}
}
break;
}
++frame.m_ii;
}
if (num_insts >= 4096)
{
err.SetErrorToGenericError();
err.SetErrorString(infinite_loop_error);
