Newer
Older
return false;
}
case Instruction::Add:
case Instruction::Alloca:
case Instruction::BitCast:
case Instruction::Br:
case Instruction::GetElementPtr:
break;
case Instruction::ICmp:
{
ICmpInst *icmp_inst = dyn_cast<ICmpInst>(ii);
if (!icmp_inst)
{
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
switch (icmp_inst->getPredicate())
{
default:
{
if (log)
log->Printf("Unsupported ICmp predicate: %s", PrintValue(ii).c_str());
err.SetErrorToGenericError();
err.SetErrorString(unsupported_opcode_error);
return false;
}
case CmpInst::ICMP_EQ:
case CmpInst::ICMP_NE:
case CmpInst::ICMP_UGT:
case CmpInst::ICMP_UGE:
case CmpInst::ICMP_ULT:
case CmpInst::ICMP_ULE:
case CmpInst::ICMP_SGT:
case CmpInst::ICMP_SGE:
case CmpInst::ICMP_SLT:
case CmpInst::ICMP_SLE:
break;
}
}
break;
case Instruction::IntToPtr:
case Instruction::Load:
case Instruction::Mul:
case Instruction::Ret:
case Instruction::SDiv:
case Instruction::Store:
case Instruction::Sub:
case Instruction::UDiv:
break;
}
}
}
return true;
}
bool
IRInterpreter::runOnFunction (lldb::ClangExpressionVariableSP &result,
const lldb_private::ConstString &result_name,
lldb_private::TypeFromParser result_type,
Function &llvm_function,
Module &llvm_module,
lldb_private::Error &err)
{
lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
lldb_private::ClangExpressionDeclMap::TargetInfo target_info = m_decl_map.GetTargetInfo();
if (!target_info.IsValid())
{
err.SetErrorToGenericError();
err.SetErrorString(interpreter_initialization_error);
lldb::addr_t alloc_min;
lldb::addr_t alloc_max;
switch (target_info.address_byte_size)
{
default:
err.SetErrorToGenericError();
err.SetErrorString(interpreter_initialization_error);
return false;
case 4:
alloc_min = 0x00001000llu;
alloc_max = 0x0000ffffllu;
break;
case 8:
alloc_min = 0x0000000000001000llu;
alloc_max = 0x000000000000ffffllu;
break;
}
if (target_data.getPointerSize(0) != target_info.address_byte_size)
{
err.SetErrorToGenericError();
err.SetErrorString(interpreter_initialization_error);
if (target_data.isLittleEndian() != (target_info.byte_order == lldb::eByteOrderLittle))
{
err.SetErrorToGenericError();
err.SetErrorString(interpreter_initialization_error);
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
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:
case Instruction::SRem:
case Instruction::URem:
{
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);
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
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;
case Instruction::SRem:
result = L % R;
break;
case Instruction::URem:
result = L.GetRawBits64(0) % R.GetRawBits64(1);
break;
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
}
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);
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 CastInst *cast_inst = dyn_cast<CastInst>(inst);
log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName());
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
return false;
}
Value *source = 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);
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
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);
typedef SmallVector <Value *, 8> IndexVector;
typedef IndexVector::iterator IndexIterator;
SmallVector <Value *, 8> indices (gep_inst->idx_begin(),
gep_inst->idx_end());
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
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, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str());
err.SetErrorToGenericError();
err.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 = target_data.getIndexedOffset(pointer_type, const_indices);
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
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);
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
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;
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
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");
err.SetErrorToGenericError();
err.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, llvm_module))
{
if (log)
log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str());
err.SetErrorToGenericError();
err.SetErrorString(bad_value_error);
return false;
}
frame.AssignValue(inst, I, llvm_module);
if (log)
{
log->Printf("Interpreted a PtrToInt");
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());
if (!frame.ConstructResult(result, result_value, result_name, result_type, llvm_module))
{
if (log)
log->Printf("Couldn't construct the expression's result");
err.SetErrorToGenericError();
err.SetErrorString(bad_result_error);
return false;
}
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");
err.SetErrorToGenericError();
err.SetErrorString(interpreter_internal_error);
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
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);
