1 //===-- IRInterpreter.cpp -------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "lldb/Expression/IRInterpreter.h" 10 #include "lldb/Core/Module.h" 11 #include "lldb/Core/ModuleSpec.h" 12 #include "lldb/Core/ValueObject.h" 13 #include "lldb/Expression/DiagnosticManager.h" 14 #include "lldb/Expression/IRExecutionUnit.h" 15 #include "lldb/Expression/IRMemoryMap.h" 16 #include "lldb/Utility/ConstString.h" 17 #include "lldb/Utility/DataExtractor.h" 18 #include "lldb/Utility/Endian.h" 19 #include "lldb/Utility/LLDBLog.h" 20 #include "lldb/Utility/Log.h" 21 #include "lldb/Utility/Scalar.h" 22 #include "lldb/Utility/Status.h" 23 #include "lldb/Utility/StreamString.h" 24 25 #include "lldb/Target/ABI.h" 26 #include "lldb/Target/ExecutionContext.h" 27 #include "lldb/Target/Target.h" 28 #include "lldb/Target/Thread.h" 29 #include "lldb/Target/ThreadPlan.h" 30 #include "lldb/Target/ThreadPlanCallFunctionUsingABI.h" 31 32 #include "llvm/IR/Constants.h" 33 #include "llvm/IR/DataLayout.h" 34 #include "llvm/IR/Function.h" 35 #include "llvm/IR/Instructions.h" 36 #include "llvm/IR/Intrinsics.h" 37 #include "llvm/IR/LLVMContext.h" 38 #include "llvm/IR/Module.h" 39 #include "llvm/IR/Operator.h" 40 #include "llvm/Support/raw_ostream.h" 41 42 #include <map> 43 44 using namespace llvm; 45 using lldb_private::LLDBLog; 46 47 static std::string PrintValue(const Value *value, bool truncate = false) { 48 std::string s; 49 raw_string_ostream rso(s); 50 value->print(rso); 51 rso.flush(); 52 if (truncate) 53 s.resize(s.length() - 1); 54 55 size_t offset; 56 while ((offset = s.find('\n')) != s.npos) 57 s.erase(offset, 1); 58 while (s[0] == ' ' || s[0] == '\t') 59 s.erase(0, 1); 60 61 return s; 62 } 63 64 static std::string PrintType(const Type *type, bool truncate = false) { 65 std::string s; 66 raw_string_ostream rso(s); 67 type->print(rso); 68 rso.flush(); 69 if (truncate) 70 s.resize(s.length() - 1); 71 return s; 72 } 73 74 static bool CanIgnoreCall(const CallInst *call) { 75 const llvm::Function *called_function = call->getCalledFunction(); 76 77 if (!called_function) 78 return false; 79 80 if (called_function->isIntrinsic()) { 81 switch (called_function->getIntrinsicID()) { 82 default: 83 break; 84 case llvm::Intrinsic::dbg_declare: 85 case llvm::Intrinsic::dbg_value: 86 return true; 87 } 88 } 89 90 return false; 91 } 92 93 class InterpreterStackFrame { 94 public: 95 typedef std::map<const Value *, lldb::addr_t> ValueMap; 96 97 ValueMap m_values; 98 DataLayout &m_target_data; 99 lldb_private::IRExecutionUnit &m_execution_unit; 100 const BasicBlock *m_bb = nullptr; 101 const BasicBlock *m_prev_bb = nullptr; 102 BasicBlock::const_iterator m_ii; 103 BasicBlock::const_iterator m_ie; 104 105 lldb::addr_t m_frame_process_address; 106 size_t m_frame_size; 107 lldb::addr_t m_stack_pointer; 108 109 lldb::ByteOrder m_byte_order; 110 size_t m_addr_byte_size; 111 112 InterpreterStackFrame(DataLayout &target_data, 113 lldb_private::IRExecutionUnit &execution_unit, 114 lldb::addr_t stack_frame_bottom, 115 lldb::addr_t stack_frame_top) 116 : m_target_data(target_data), m_execution_unit(execution_unit) { 117 m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle 118 : lldb::eByteOrderBig); 119 m_addr_byte_size = (target_data.getPointerSize(0)); 120 121 m_frame_process_address = stack_frame_bottom; 122 m_frame_size = stack_frame_top - stack_frame_bottom; 123 m_stack_pointer = stack_frame_top; 124 } 125 126 ~InterpreterStackFrame() = default; 127 128 void Jump(const BasicBlock *bb) { 129 m_prev_bb = m_bb; 130 m_bb = bb; 131 m_ii = m_bb->begin(); 132 m_ie = m_bb->end(); 133 } 134 135 std::string SummarizeValue(const Value *value) { 136 lldb_private::StreamString ss; 137 138 ss.Printf("%s", PrintValue(value).c_str()); 139 140 ValueMap::iterator i = m_values.find(value); 141 142 if (i != m_values.end()) { 143 lldb::addr_t addr = i->second; 144 145 ss.Printf(" 0x%llx", (unsigned long long)addr); 146 } 147 148 return std::string(ss.GetString()); 149 } 150 151 bool AssignToMatchType(lldb_private::Scalar &scalar, llvm::APInt value, 152 Type *type) { 153 size_t type_size = m_target_data.getTypeStoreSize(type); 154 155 if (type_size > 8) 156 return false; 157 158 if (type_size != 1) 159 type_size = PowerOf2Ceil(type_size); 160 161 scalar = value.zextOrTrunc(type_size * 8); 162 return true; 163 } 164 165 bool EvaluateValue(lldb_private::Scalar &scalar, const Value *value, 166 Module &module) { 167 const Constant *constant = dyn_cast<Constant>(value); 168 169 if (constant) { 170 APInt value_apint; 171 172 if (!ResolveConstantValue(value_apint, constant)) 173 return false; 174 175 return AssignToMatchType(scalar, value_apint, value->getType()); 176 } 177 178 lldb::addr_t process_address = ResolveValue(value, module); 179 size_t value_size = m_target_data.getTypeStoreSize(value->getType()); 180 181 lldb_private::DataExtractor value_extractor; 182 lldb_private::Status extract_error; 183 184 m_execution_unit.GetMemoryData(value_extractor, process_address, 185 value_size, extract_error); 186 187 if (!extract_error.Success()) 188 return false; 189 190 lldb::offset_t offset = 0; 191 if (value_size <= 8) { 192 uint64_t u64value = value_extractor.GetMaxU64(&offset, value_size); 193 return AssignToMatchType(scalar, llvm::APInt(64, u64value), 194 value->getType()); 195 } 196 197 return false; 198 } 199 200 bool AssignValue(const Value *value, lldb_private::Scalar scalar, 201 Module &module) { 202 lldb::addr_t process_address = ResolveValue(value, module); 203 204 if (process_address == LLDB_INVALID_ADDRESS) 205 return false; 206 207 lldb_private::Scalar cast_scalar; 208 209 scalar.MakeUnsigned(); 210 if (!AssignToMatchType(cast_scalar, scalar.UInt128(llvm::APInt()), 211 value->getType())) 212 return false; 213 214 size_t value_byte_size = m_target_data.getTypeStoreSize(value->getType()); 215 216 lldb_private::DataBufferHeap buf(value_byte_size, 0); 217 218 lldb_private::Status get_data_error; 219 220 if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), 221 m_byte_order, get_data_error)) 222 return false; 223 224 lldb_private::Status write_error; 225 226 m_execution_unit.WriteMemory(process_address, buf.GetBytes(), 227 buf.GetByteSize(), write_error); 228 229 return write_error.Success(); 230 } 231 232 bool ResolveConstantValue(APInt &value, const Constant *constant) { 233 switch (constant->getValueID()) { 234 default: 235 break; 236 case Value::FunctionVal: 237 if (const Function *constant_func = dyn_cast<Function>(constant)) { 238 lldb_private::ConstString name(constant_func->getName()); 239 bool missing_weak = false; 240 lldb::addr_t addr = m_execution_unit.FindSymbol(name, missing_weak); 241 if (addr == LLDB_INVALID_ADDRESS || missing_weak) 242 return false; 243 value = APInt(m_target_data.getPointerSizeInBits(), addr); 244 return true; 245 } 246 break; 247 case Value::ConstantIntVal: 248 if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) { 249 value = constant_int->getValue(); 250 return true; 251 } 252 break; 253 case Value::ConstantFPVal: 254 if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) { 255 value = constant_fp->getValueAPF().bitcastToAPInt(); 256 return true; 257 } 258 break; 259 case Value::ConstantExprVal: 260 if (const ConstantExpr *constant_expr = 261 dyn_cast<ConstantExpr>(constant)) { 262 switch (constant_expr->getOpcode()) { 263 default: 264 return false; 265 case Instruction::IntToPtr: 266 case Instruction::PtrToInt: 267 case Instruction::BitCast: 268 return ResolveConstantValue(value, constant_expr->getOperand(0)); 269 case Instruction::GetElementPtr: { 270 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 271 ConstantExpr::const_op_iterator op_end = constant_expr->op_end(); 272 273 Constant *base = dyn_cast<Constant>(*op_cursor); 274 275 if (!base) 276 return false; 277 278 if (!ResolveConstantValue(value, base)) 279 return false; 280 281 op_cursor++; 282 283 if (op_cursor == op_end) 284 return true; // no offset to apply! 285 286 SmallVector<Value *, 8> indices(op_cursor, op_end); 287 Type *src_elem_ty = 288 cast<GEPOperator>(constant_expr)->getSourceElementType(); 289 290 // DataLayout::getIndexedOffsetInType assumes the indices are 291 // instances of ConstantInt. 292 uint64_t offset = 293 m_target_data.getIndexedOffsetInType(src_elem_ty, indices); 294 295 const bool is_signed = true; 296 value += APInt(value.getBitWidth(), offset, is_signed); 297 298 return true; 299 } 300 } 301 } 302 break; 303 case Value::ConstantPointerNullVal: 304 if (isa<ConstantPointerNull>(constant)) { 305 value = APInt(m_target_data.getPointerSizeInBits(), 0); 306 return true; 307 } 308 break; 309 } 310 return false; 311 } 312 313 bool MakeArgument(const Argument *value, uint64_t address) { 314 lldb::addr_t data_address = Malloc(value->getType()); 315 316 if (data_address == LLDB_INVALID_ADDRESS) 317 return false; 318 319 lldb_private::Status write_error; 320 321 m_execution_unit.WritePointerToMemory(data_address, address, write_error); 322 323 if (!write_error.Success()) { 324 lldb_private::Status free_error; 325 m_execution_unit.Free(data_address, free_error); 326 return false; 327 } 328 329 m_values[value] = data_address; 330 331 lldb_private::Log *log(GetLog(LLDBLog::Expressions)); 332 333 if (log) { 334 LLDB_LOGF(log, "Made an allocation for argument %s", 335 PrintValue(value).c_str()); 336 LLDB_LOGF(log, " Data region : %llx", (unsigned long long)address); 337 LLDB_LOGF(log, " Ref region : %llx", 338 (unsigned long long)data_address); 339 } 340 341 return true; 342 } 343 344 bool ResolveConstant(lldb::addr_t process_address, const Constant *constant) { 345 APInt resolved_value; 346 347 if (!ResolveConstantValue(resolved_value, constant)) 348 return false; 349 350 size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); 351 lldb_private::DataBufferHeap buf(constant_size, 0); 352 353 lldb_private::Status get_data_error; 354 355 lldb_private::Scalar resolved_scalar( 356 resolved_value.zextOrTrunc(llvm::NextPowerOf2(constant_size) * 8)); 357 if (!resolved_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), 358 m_byte_order, get_data_error)) 359 return false; 360 361 lldb_private::Status write_error; 362 363 m_execution_unit.WriteMemory(process_address, buf.GetBytes(), 364 buf.GetByteSize(), write_error); 365 366 return write_error.Success(); 367 } 368 369 lldb::addr_t Malloc(size_t size, uint8_t byte_alignment) { 370 lldb::addr_t ret = m_stack_pointer; 371 372 ret -= size; 373 ret -= (ret % byte_alignment); 374 375 if (ret < m_frame_process_address) 376 return LLDB_INVALID_ADDRESS; 377 378 m_stack_pointer = ret; 379 return ret; 380 } 381 382 lldb::addr_t Malloc(llvm::Type *type) { 383 lldb_private::Status alloc_error; 384 385 return Malloc(m_target_data.getTypeAllocSize(type), 386 m_target_data.getPrefTypeAlignment(type)); 387 } 388 389 std::string PrintData(lldb::addr_t addr, llvm::Type *type) { 390 size_t length = m_target_data.getTypeStoreSize(type); 391 392 lldb_private::DataBufferHeap buf(length, 0); 393 394 lldb_private::Status read_error; 395 396 m_execution_unit.ReadMemory(buf.GetBytes(), addr, length, read_error); 397 398 if (!read_error.Success()) 399 return std::string("<couldn't read data>"); 400 401 lldb_private::StreamString ss; 402 403 for (size_t i = 0; i < length; i++) { 404 if ((!(i & 0xf)) && i) 405 ss.Printf("%02hhx - ", buf.GetBytes()[i]); 406 else 407 ss.Printf("%02hhx ", buf.GetBytes()[i]); 408 } 409 410 return std::string(ss.GetString()); 411 } 412 413 lldb::addr_t ResolveValue(const Value *value, Module &module) { 414 ValueMap::iterator i = m_values.find(value); 415 416 if (i != m_values.end()) 417 return i->second; 418 419 // Fall back and allocate space [allocation type Alloca] 420 421 lldb::addr_t data_address = Malloc(value->getType()); 422 423 if (const Constant *constant = dyn_cast<Constant>(value)) { 424 if (!ResolveConstant(data_address, constant)) { 425 lldb_private::Status free_error; 426 m_execution_unit.Free(data_address, free_error); 427 return LLDB_INVALID_ADDRESS; 428 } 429 } 430 431 m_values[value] = data_address; 432 return data_address; 433 } 434 }; 435 436 static const char *unsupported_opcode_error = 437 "Interpreter doesn't handle one of the expression's opcodes"; 438 static const char *unsupported_operand_error = 439 "Interpreter doesn't handle one of the expression's operands"; 440 static const char *interpreter_internal_error = 441 "Interpreter encountered an internal error"; 442 static const char *bad_value_error = 443 "Interpreter couldn't resolve a value during execution"; 444 static const char *memory_allocation_error = 445 "Interpreter couldn't allocate memory"; 446 static const char *memory_write_error = "Interpreter couldn't write to memory"; 447 static const char *memory_read_error = "Interpreter couldn't read from memory"; 448 static const char *infinite_loop_error = "Interpreter ran for too many cycles"; 449 static const char *too_many_functions_error = 450 "Interpreter doesn't handle modules with multiple function bodies."; 451 452 static bool CanResolveConstant(llvm::Constant *constant) { 453 switch (constant->getValueID()) { 454 default: 455 return false; 456 case Value::ConstantIntVal: 457 case Value::ConstantFPVal: 458 case Value::FunctionVal: 459 return true; 460 case Value::ConstantExprVal: 461 if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) { 462 switch (constant_expr->getOpcode()) { 463 default: 464 return false; 465 case Instruction::IntToPtr: 466 case Instruction::PtrToInt: 467 case Instruction::BitCast: 468 return CanResolveConstant(constant_expr->getOperand(0)); 469 case Instruction::GetElementPtr: { 470 // Check that the base can be constant-resolved. 471 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 472 Constant *base = dyn_cast<Constant>(*op_cursor); 473 if (!base || !CanResolveConstant(base)) 474 return false; 475 476 // Check that all other operands are just ConstantInt. 477 for (Value *op : make_range(constant_expr->op_begin() + 1, 478 constant_expr->op_end())) { 479 ConstantInt *constant_int = dyn_cast<ConstantInt>(op); 480 if (!constant_int) 481 return false; 482 } 483 return true; 484 } 485 } 486 } else { 487 return false; 488 } 489 case Value::ConstantPointerNullVal: 490 return true; 491 } 492 } 493 494 bool IRInterpreter::CanInterpret(llvm::Module &module, llvm::Function &function, 495 lldb_private::Status &error, 496 const bool support_function_calls) { 497 lldb_private::Log *log(GetLog(LLDBLog::Expressions)); 498 499 bool saw_function_with_body = false; 500 for (Function &f : module) { 501 if (f.begin() != f.end()) { 502 if (saw_function_with_body) { 503 LLDB_LOGF(log, "More than one function in the module has a body"); 504 error.SetErrorToGenericError(); 505 error.SetErrorString(too_many_functions_error); 506 return false; 507 } 508 saw_function_with_body = true; 509 } 510 } 511 512 for (BasicBlock &bb : function) { 513 for (Instruction &ii : bb) { 514 switch (ii.getOpcode()) { 515 default: { 516 LLDB_LOGF(log, "Unsupported instruction: %s", PrintValue(&ii).c_str()); 517 error.SetErrorToGenericError(); 518 error.SetErrorString(unsupported_opcode_error); 519 return false; 520 } 521 case Instruction::Add: 522 case Instruction::Alloca: 523 case Instruction::BitCast: 524 case Instruction::Br: 525 case Instruction::PHI: 526 break; 527 case Instruction::Call: { 528 CallInst *call_inst = dyn_cast<CallInst>(&ii); 529 530 if (!call_inst) { 531 error.SetErrorToGenericError(); 532 error.SetErrorString(interpreter_internal_error); 533 return false; 534 } 535 536 if (!CanIgnoreCall(call_inst) && !support_function_calls) { 537 LLDB_LOGF(log, "Unsupported instruction: %s", 538 PrintValue(&ii).c_str()); 539 error.SetErrorToGenericError(); 540 error.SetErrorString(unsupported_opcode_error); 541 return false; 542 } 543 } break; 544 case Instruction::GetElementPtr: 545 break; 546 case Instruction::ICmp: { 547 ICmpInst *icmp_inst = dyn_cast<ICmpInst>(&ii); 548 549 if (!icmp_inst) { 550 error.SetErrorToGenericError(); 551 error.SetErrorString(interpreter_internal_error); 552 return false; 553 } 554 555 switch (icmp_inst->getPredicate()) { 556 default: { 557 LLDB_LOGF(log, "Unsupported ICmp predicate: %s", 558 PrintValue(&ii).c_str()); 559 560 error.SetErrorToGenericError(); 561 error.SetErrorString(unsupported_opcode_error); 562 return false; 563 } 564 case CmpInst::ICMP_EQ: 565 case CmpInst::ICMP_NE: 566 case CmpInst::ICMP_UGT: 567 case CmpInst::ICMP_UGE: 568 case CmpInst::ICMP_ULT: 569 case CmpInst::ICMP_ULE: 570 case CmpInst::ICMP_SGT: 571 case CmpInst::ICMP_SGE: 572 case CmpInst::ICMP_SLT: 573 case CmpInst::ICMP_SLE: 574 break; 575 } 576 } break; 577 case Instruction::And: 578 case Instruction::AShr: 579 case Instruction::IntToPtr: 580 case Instruction::PtrToInt: 581 case Instruction::Load: 582 case Instruction::LShr: 583 case Instruction::Mul: 584 case Instruction::Or: 585 case Instruction::Ret: 586 case Instruction::SDiv: 587 case Instruction::SExt: 588 case Instruction::Shl: 589 case Instruction::SRem: 590 case Instruction::Store: 591 case Instruction::Sub: 592 case Instruction::Trunc: 593 case Instruction::UDiv: 594 case Instruction::URem: 595 case Instruction::Xor: 596 case Instruction::ZExt: 597 break; 598 } 599 600 for (unsigned oi = 0, oe = ii.getNumOperands(); oi != oe; ++oi) { 601 Value *operand = ii.getOperand(oi); 602 Type *operand_type = operand->getType(); 603 604 switch (operand_type->getTypeID()) { 605 default: 606 break; 607 case Type::FixedVectorTyID: 608 case Type::ScalableVectorTyID: { 609 LLDB_LOGF(log, "Unsupported operand type: %s", 610 PrintType(operand_type).c_str()); 611 error.SetErrorString(unsupported_operand_error); 612 return false; 613 } 614 } 615 616 // The IR interpreter currently doesn't know about 617 // 128-bit integers. As they're not that frequent, 618 // we can just fall back to the JIT rather than 619 // choking. 620 if (operand_type->getPrimitiveSizeInBits() > 64) { 621 LLDB_LOGF(log, "Unsupported operand type: %s", 622 PrintType(operand_type).c_str()); 623 error.SetErrorString(unsupported_operand_error); 624 return false; 625 } 626 627 if (Constant *constant = llvm::dyn_cast<Constant>(operand)) { 628 if (!CanResolveConstant(constant)) { 629 LLDB_LOGF(log, "Unsupported constant: %s", 630 PrintValue(constant).c_str()); 631 error.SetErrorString(unsupported_operand_error); 632 return false; 633 } 634 } 635 } 636 } 637 } 638 639 return true; 640 } 641 642 bool IRInterpreter::Interpret(llvm::Module &module, llvm::Function &function, 643 llvm::ArrayRef<lldb::addr_t> args, 644 lldb_private::IRExecutionUnit &execution_unit, 645 lldb_private::Status &error, 646 lldb::addr_t stack_frame_bottom, 647 lldb::addr_t stack_frame_top, 648 lldb_private::ExecutionContext &exe_ctx) { 649 lldb_private::Log *log(GetLog(LLDBLog::Expressions)); 650 651 if (log) { 652 std::string s; 653 raw_string_ostream oss(s); 654 655 module.print(oss, nullptr); 656 657 oss.flush(); 658 659 LLDB_LOGF(log, "Module as passed in to IRInterpreter::Interpret: \n\"%s\"", 660 s.c_str()); 661 } 662 663 DataLayout data_layout(&module); 664 665 InterpreterStackFrame frame(data_layout, execution_unit, stack_frame_bottom, 666 stack_frame_top); 667 668 if (frame.m_frame_process_address == LLDB_INVALID_ADDRESS) { 669 error.SetErrorString("Couldn't allocate stack frame"); 670 } 671 672 int arg_index = 0; 673 674 for (llvm::Function::arg_iterator ai = function.arg_begin(), 675 ae = function.arg_end(); 676 ai != ae; ++ai, ++arg_index) { 677 if (args.size() <= static_cast<size_t>(arg_index)) { 678 error.SetErrorString("Not enough arguments passed in to function"); 679 return false; 680 } 681 682 lldb::addr_t ptr = args[arg_index]; 683 684 frame.MakeArgument(&*ai, ptr); 685 } 686 687 uint32_t num_insts = 0; 688 689 frame.Jump(&function.front()); 690 691 while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) { 692 const Instruction *inst = &*frame.m_ii; 693 694 LLDB_LOGF(log, "Interpreting %s", PrintValue(inst).c_str()); 695 696 switch (inst->getOpcode()) { 697 default: 698 break; 699 700 case Instruction::Add: 701 case Instruction::Sub: 702 case Instruction::Mul: 703 case Instruction::SDiv: 704 case Instruction::UDiv: 705 case Instruction::SRem: 706 case Instruction::URem: 707 case Instruction::Shl: 708 case Instruction::LShr: 709 case Instruction::AShr: 710 case Instruction::And: 711 case Instruction::Or: 712 case Instruction::Xor: { 713 const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst); 714 715 if (!bin_op) { 716 LLDB_LOGF( 717 log, 718 "getOpcode() returns %s, but instruction is not a BinaryOperator", 719 inst->getOpcodeName()); 720 error.SetErrorToGenericError(); 721 error.SetErrorString(interpreter_internal_error); 722 return false; 723 } 724 725 Value *lhs = inst->getOperand(0); 726 Value *rhs = inst->getOperand(1); 727 728 lldb_private::Scalar L; 729 lldb_private::Scalar R; 730 731 if (!frame.EvaluateValue(L, lhs, module)) { 732 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); 733 error.SetErrorToGenericError(); 734 error.SetErrorString(bad_value_error); 735 return false; 736 } 737 738 if (!frame.EvaluateValue(R, rhs, module)) { 739 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str()); 740 error.SetErrorToGenericError(); 741 error.SetErrorString(bad_value_error); 742 return false; 743 } 744 745 lldb_private::Scalar result; 746 747 switch (inst->getOpcode()) { 748 default: 749 break; 750 case Instruction::Add: 751 result = L + R; 752 break; 753 case Instruction::Mul: 754 result = L * R; 755 break; 756 case Instruction::Sub: 757 result = L - R; 758 break; 759 case Instruction::SDiv: 760 L.MakeSigned(); 761 R.MakeSigned(); 762 result = L / R; 763 break; 764 case Instruction::UDiv: 765 L.MakeUnsigned(); 766 R.MakeUnsigned(); 767 result = L / R; 768 break; 769 case Instruction::SRem: 770 L.MakeSigned(); 771 R.MakeSigned(); 772 result = L % R; 773 break; 774 case Instruction::URem: 775 L.MakeUnsigned(); 776 R.MakeUnsigned(); 777 result = L % R; 778 break; 779 case Instruction::Shl: 780 result = L << R; 781 break; 782 case Instruction::AShr: 783 result = L >> R; 784 break; 785 case Instruction::LShr: 786 result = L; 787 result.ShiftRightLogical(R); 788 break; 789 case Instruction::And: 790 result = L & R; 791 break; 792 case Instruction::Or: 793 result = L | R; 794 break; 795 case Instruction::Xor: 796 result = L ^ R; 797 break; 798 } 799 800 frame.AssignValue(inst, result, module); 801 802 if (log) { 803 LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); 804 LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); 805 LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); 806 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 807 } 808 } break; 809 case Instruction::Alloca: { 810 const AllocaInst *alloca_inst = cast<AllocaInst>(inst); 811 812 if (alloca_inst->isArrayAllocation()) { 813 LLDB_LOGF(log, 814 "AllocaInsts are not handled if isArrayAllocation() is true"); 815 error.SetErrorToGenericError(); 816 error.SetErrorString(unsupported_opcode_error); 817 return false; 818 } 819 820 // The semantics of Alloca are: 821 // Create a region R of virtual memory of type T, backed by a data 822 // buffer 823 // Create a region P of virtual memory of type T*, backed by a data 824 // buffer 825 // Write the virtual address of R into P 826 827 Type *T = alloca_inst->getAllocatedType(); 828 Type *Tptr = alloca_inst->getType(); 829 830 lldb::addr_t R = frame.Malloc(T); 831 832 if (R == LLDB_INVALID_ADDRESS) { 833 LLDB_LOGF(log, "Couldn't allocate memory for an AllocaInst"); 834 error.SetErrorToGenericError(); 835 error.SetErrorString(memory_allocation_error); 836 return false; 837 } 838 839 lldb::addr_t P = frame.Malloc(Tptr); 840 841 if (P == LLDB_INVALID_ADDRESS) { 842 LLDB_LOGF(log, 843 "Couldn't allocate the result pointer for an AllocaInst"); 844 error.SetErrorToGenericError(); 845 error.SetErrorString(memory_allocation_error); 846 return false; 847 } 848 849 lldb_private::Status write_error; 850 851 execution_unit.WritePointerToMemory(P, R, write_error); 852 853 if (!write_error.Success()) { 854 LLDB_LOGF(log, "Couldn't write the result pointer for an AllocaInst"); 855 error.SetErrorToGenericError(); 856 error.SetErrorString(memory_write_error); 857 lldb_private::Status free_error; 858 execution_unit.Free(P, free_error); 859 execution_unit.Free(R, free_error); 860 return false; 861 } 862 863 frame.m_values[alloca_inst] = P; 864 865 if (log) { 866 LLDB_LOGF(log, "Interpreted an AllocaInst"); 867 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 868 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 869 } 870 } break; 871 case Instruction::BitCast: 872 case Instruction::ZExt: { 873 const CastInst *cast_inst = cast<CastInst>(inst); 874 875 Value *source = cast_inst->getOperand(0); 876 877 lldb_private::Scalar S; 878 879 if (!frame.EvaluateValue(S, source, module)) { 880 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str()); 881 error.SetErrorToGenericError(); 882 error.SetErrorString(bad_value_error); 883 return false; 884 } 885 886 frame.AssignValue(inst, S, module); 887 } break; 888 case Instruction::SExt: { 889 const CastInst *cast_inst = cast<CastInst>(inst); 890 891 Value *source = cast_inst->getOperand(0); 892 893 lldb_private::Scalar S; 894 895 if (!frame.EvaluateValue(S, source, module)) { 896 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str()); 897 error.SetErrorToGenericError(); 898 error.SetErrorString(bad_value_error); 899 return false; 900 } 901 902 S.MakeSigned(); 903 904 lldb_private::Scalar S_signextend(S.SLongLong()); 905 906 frame.AssignValue(inst, S_signextend, module); 907 } break; 908 case Instruction::Br: { 909 const BranchInst *br_inst = cast<BranchInst>(inst); 910 911 if (br_inst->isConditional()) { 912 Value *condition = br_inst->getCondition(); 913 914 lldb_private::Scalar C; 915 916 if (!frame.EvaluateValue(C, condition, module)) { 917 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(condition).c_str()); 918 error.SetErrorToGenericError(); 919 error.SetErrorString(bad_value_error); 920 return false; 921 } 922 923 if (!C.IsZero()) 924 frame.Jump(br_inst->getSuccessor(0)); 925 else 926 frame.Jump(br_inst->getSuccessor(1)); 927 928 if (log) { 929 LLDB_LOGF(log, "Interpreted a BrInst with a condition"); 930 LLDB_LOGF(log, " cond : %s", 931 frame.SummarizeValue(condition).c_str()); 932 } 933 } else { 934 frame.Jump(br_inst->getSuccessor(0)); 935 936 if (log) { 937 LLDB_LOGF(log, "Interpreted a BrInst with no condition"); 938 } 939 } 940 } 941 continue; 942 case Instruction::PHI: { 943 const PHINode *phi_inst = cast<PHINode>(inst); 944 if (!frame.m_prev_bb) { 945 LLDB_LOGF(log, 946 "Encountered PHI node without having jumped from another " 947 "basic block"); 948 error.SetErrorToGenericError(); 949 error.SetErrorString(interpreter_internal_error); 950 return false; 951 } 952 953 Value *value = phi_inst->getIncomingValueForBlock(frame.m_prev_bb); 954 lldb_private::Scalar result; 955 if (!frame.EvaluateValue(result, value, module)) { 956 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(value).c_str()); 957 error.SetErrorToGenericError(); 958 error.SetErrorString(bad_value_error); 959 return false; 960 } 961 frame.AssignValue(inst, result, module); 962 963 if (log) { 964 LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); 965 LLDB_LOGF(log, " Incoming value : %s", 966 frame.SummarizeValue(value).c_str()); 967 } 968 } break; 969 case Instruction::GetElementPtr: { 970 const GetElementPtrInst *gep_inst = cast<GetElementPtrInst>(inst); 971 972 const Value *pointer_operand = gep_inst->getPointerOperand(); 973 Type *src_elem_ty = gep_inst->getSourceElementType(); 974 975 lldb_private::Scalar P; 976 977 if (!frame.EvaluateValue(P, pointer_operand, module)) { 978 LLDB_LOGF(log, "Couldn't evaluate %s", 979 PrintValue(pointer_operand).c_str()); 980 error.SetErrorToGenericError(); 981 error.SetErrorString(bad_value_error); 982 return false; 983 } 984 985 typedef SmallVector<Value *, 8> IndexVector; 986 typedef IndexVector::iterator IndexIterator; 987 988 SmallVector<Value *, 8> indices(gep_inst->idx_begin(), 989 gep_inst->idx_end()); 990 991 SmallVector<Value *, 8> const_indices; 992 993 for (IndexIterator ii = indices.begin(), ie = indices.end(); ii != ie; 994 ++ii) { 995 ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii); 996 997 if (!constant_index) { 998 lldb_private::Scalar I; 999 1000 if (!frame.EvaluateValue(I, *ii, module)) { 1001 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(*ii).c_str()); 1002 error.SetErrorToGenericError(); 1003 error.SetErrorString(bad_value_error); 1004 return false; 1005 } 1006 1007 LLDB_LOGF(log, "Evaluated constant index %s as %llu", 1008 PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS)); 1009 1010 constant_index = cast<ConstantInt>(ConstantInt::get( 1011 (*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS))); 1012 } 1013 1014 const_indices.push_back(constant_index); 1015 } 1016 1017 uint64_t offset = 1018 data_layout.getIndexedOffsetInType(src_elem_ty, const_indices); 1019 1020 lldb_private::Scalar Poffset = P + offset; 1021 1022 frame.AssignValue(inst, Poffset, module); 1023 1024 if (log) { 1025 LLDB_LOGF(log, "Interpreted a GetElementPtrInst"); 1026 LLDB_LOGF(log, " P : %s", 1027 frame.SummarizeValue(pointer_operand).c_str()); 1028 LLDB_LOGF(log, " Poffset : %s", frame.SummarizeValue(inst).c_str()); 1029 } 1030 } break; 1031 case Instruction::ICmp: { 1032 const ICmpInst *icmp_inst = cast<ICmpInst>(inst); 1033 1034 CmpInst::Predicate predicate = icmp_inst->getPredicate(); 1035 1036 Value *lhs = inst->getOperand(0); 1037 Value *rhs = inst->getOperand(1); 1038 1039 lldb_private::Scalar L; 1040 lldb_private::Scalar R; 1041 1042 if (!frame.EvaluateValue(L, lhs, module)) { 1043 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); 1044 error.SetErrorToGenericError(); 1045 error.SetErrorString(bad_value_error); 1046 return false; 1047 } 1048 1049 if (!frame.EvaluateValue(R, rhs, module)) { 1050 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str()); 1051 error.SetErrorToGenericError(); 1052 error.SetErrorString(bad_value_error); 1053 return false; 1054 } 1055 1056 lldb_private::Scalar result; 1057 1058 switch (predicate) { 1059 default: 1060 return false; 1061 case CmpInst::ICMP_EQ: 1062 result = (L == R); 1063 break; 1064 case CmpInst::ICMP_NE: 1065 result = (L != R); 1066 break; 1067 case CmpInst::ICMP_UGT: 1068 L.MakeUnsigned(); 1069 R.MakeUnsigned(); 1070 result = (L > R); 1071 break; 1072 case CmpInst::ICMP_UGE: 1073 L.MakeUnsigned(); 1074 R.MakeUnsigned(); 1075 result = (L >= R); 1076 break; 1077 case CmpInst::ICMP_ULT: 1078 L.MakeUnsigned(); 1079 R.MakeUnsigned(); 1080 result = (L < R); 1081 break; 1082 case CmpInst::ICMP_ULE: 1083 L.MakeUnsigned(); 1084 R.MakeUnsigned(); 1085 result = (L <= R); 1086 break; 1087 case CmpInst::ICMP_SGT: 1088 L.MakeSigned(); 1089 R.MakeSigned(); 1090 result = (L > R); 1091 break; 1092 case CmpInst::ICMP_SGE: 1093 L.MakeSigned(); 1094 R.MakeSigned(); 1095 result = (L >= R); 1096 break; 1097 case CmpInst::ICMP_SLT: 1098 L.MakeSigned(); 1099 R.MakeSigned(); 1100 result = (L < R); 1101 break; 1102 case CmpInst::ICMP_SLE: 1103 L.MakeSigned(); 1104 R.MakeSigned(); 1105 result = (L <= R); 1106 break; 1107 } 1108 1109 frame.AssignValue(inst, result, module); 1110 1111 if (log) { 1112 LLDB_LOGF(log, "Interpreted an ICmpInst"); 1113 LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); 1114 LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); 1115 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1116 } 1117 } break; 1118 case Instruction::IntToPtr: { 1119 const IntToPtrInst *int_to_ptr_inst = cast<IntToPtrInst>(inst); 1120 1121 Value *src_operand = int_to_ptr_inst->getOperand(0); 1122 1123 lldb_private::Scalar I; 1124 1125 if (!frame.EvaluateValue(I, src_operand, module)) { 1126 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1127 error.SetErrorToGenericError(); 1128 error.SetErrorString(bad_value_error); 1129 return false; 1130 } 1131 1132 frame.AssignValue(inst, I, module); 1133 1134 if (log) { 1135 LLDB_LOGF(log, "Interpreted an IntToPtr"); 1136 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1137 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1138 } 1139 } break; 1140 case Instruction::PtrToInt: { 1141 const PtrToIntInst *ptr_to_int_inst = cast<PtrToIntInst>(inst); 1142 1143 Value *src_operand = ptr_to_int_inst->getOperand(0); 1144 1145 lldb_private::Scalar I; 1146 1147 if (!frame.EvaluateValue(I, src_operand, module)) { 1148 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1149 error.SetErrorToGenericError(); 1150 error.SetErrorString(bad_value_error); 1151 return false; 1152 } 1153 1154 frame.AssignValue(inst, I, module); 1155 1156 if (log) { 1157 LLDB_LOGF(log, "Interpreted a PtrToInt"); 1158 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1159 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1160 } 1161 } break; 1162 case Instruction::Trunc: { 1163 const TruncInst *trunc_inst = cast<TruncInst>(inst); 1164 1165 Value *src_operand = trunc_inst->getOperand(0); 1166 1167 lldb_private::Scalar I; 1168 1169 if (!frame.EvaluateValue(I, src_operand, module)) { 1170 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1171 error.SetErrorToGenericError(); 1172 error.SetErrorString(bad_value_error); 1173 return false; 1174 } 1175 1176 frame.AssignValue(inst, I, module); 1177 1178 if (log) { 1179 LLDB_LOGF(log, "Interpreted a Trunc"); 1180 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1181 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1182 } 1183 } break; 1184 case Instruction::Load: { 1185 const LoadInst *load_inst = cast<LoadInst>(inst); 1186 1187 // The semantics of Load are: 1188 // Create a region D that will contain the loaded data 1189 // Resolve the region P containing a pointer 1190 // Dereference P to get the region R that the data should be loaded from 1191 // Transfer a unit of type type(D) from R to D 1192 1193 const Value *pointer_operand = load_inst->getPointerOperand(); 1194 1195 lldb::addr_t D = frame.ResolveValue(load_inst, module); 1196 lldb::addr_t P = frame.ResolveValue(pointer_operand, module); 1197 1198 if (D == LLDB_INVALID_ADDRESS) { 1199 LLDB_LOGF(log, "LoadInst's value doesn't resolve to anything"); 1200 error.SetErrorToGenericError(); 1201 error.SetErrorString(bad_value_error); 1202 return false; 1203 } 1204 1205 if (P == LLDB_INVALID_ADDRESS) { 1206 LLDB_LOGF(log, "LoadInst's pointer doesn't resolve to anything"); 1207 error.SetErrorToGenericError(); 1208 error.SetErrorString(bad_value_error); 1209 return false; 1210 } 1211 1212 lldb::addr_t R; 1213 lldb_private::Status read_error; 1214 execution_unit.ReadPointerFromMemory(&R, P, read_error); 1215 1216 if (!read_error.Success()) { 1217 LLDB_LOGF(log, "Couldn't read the address to be loaded for a LoadInst"); 1218 error.SetErrorToGenericError(); 1219 error.SetErrorString(memory_read_error); 1220 return false; 1221 } 1222 1223 Type *target_ty = load_inst->getType(); 1224 size_t target_size = data_layout.getTypeStoreSize(target_ty); 1225 lldb_private::DataBufferHeap buffer(target_size, 0); 1226 1227 read_error.Clear(); 1228 execution_unit.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), 1229 read_error); 1230 if (!read_error.Success()) { 1231 LLDB_LOGF(log, "Couldn't read from a region on behalf of a LoadInst"); 1232 error.SetErrorToGenericError(); 1233 error.SetErrorString(memory_read_error); 1234 return false; 1235 } 1236 1237 lldb_private::Status write_error; 1238 execution_unit.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), 1239 write_error); 1240 if (!write_error.Success()) { 1241 LLDB_LOGF(log, "Couldn't write to a region on behalf of a LoadInst"); 1242 error.SetErrorToGenericError(); 1243 error.SetErrorString(memory_write_error); 1244 return false; 1245 } 1246 1247 if (log) { 1248 LLDB_LOGF(log, "Interpreted a LoadInst"); 1249 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 1250 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 1251 LLDB_LOGF(log, " D : 0x%" PRIx64, D); 1252 } 1253 } break; 1254 case Instruction::Ret: { 1255 return true; 1256 } 1257 case Instruction::Store: { 1258 const StoreInst *store_inst = cast<StoreInst>(inst); 1259 1260 // The semantics of Store are: 1261 // Resolve the region D containing the data to be stored 1262 // Resolve the region P containing a pointer 1263 // Dereference P to get the region R that the data should be stored in 1264 // Transfer a unit of type type(D) from D to R 1265 1266 const Value *value_operand = store_inst->getValueOperand(); 1267 const Value *pointer_operand = store_inst->getPointerOperand(); 1268 1269 lldb::addr_t D = frame.ResolveValue(value_operand, module); 1270 lldb::addr_t P = frame.ResolveValue(pointer_operand, module); 1271 1272 if (D == LLDB_INVALID_ADDRESS) { 1273 LLDB_LOGF(log, "StoreInst's value doesn't resolve to anything"); 1274 error.SetErrorToGenericError(); 1275 error.SetErrorString(bad_value_error); 1276 return false; 1277 } 1278 1279 if (P == LLDB_INVALID_ADDRESS) { 1280 LLDB_LOGF(log, "StoreInst's pointer doesn't resolve to anything"); 1281 error.SetErrorToGenericError(); 1282 error.SetErrorString(bad_value_error); 1283 return false; 1284 } 1285 1286 lldb::addr_t R; 1287 lldb_private::Status read_error; 1288 execution_unit.ReadPointerFromMemory(&R, P, read_error); 1289 1290 if (!read_error.Success()) { 1291 LLDB_LOGF(log, "Couldn't read the address to be loaded for a LoadInst"); 1292 error.SetErrorToGenericError(); 1293 error.SetErrorString(memory_read_error); 1294 return false; 1295 } 1296 1297 Type *target_ty = value_operand->getType(); 1298 size_t target_size = data_layout.getTypeStoreSize(target_ty); 1299 lldb_private::DataBufferHeap buffer(target_size, 0); 1300 1301 read_error.Clear(); 1302 execution_unit.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), 1303 read_error); 1304 if (!read_error.Success()) { 1305 LLDB_LOGF(log, "Couldn't read from a region on behalf of a StoreInst"); 1306 error.SetErrorToGenericError(); 1307 error.SetErrorString(memory_read_error); 1308 return false; 1309 } 1310 1311 lldb_private::Status write_error; 1312 execution_unit.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), 1313 write_error); 1314 if (!write_error.Success()) { 1315 LLDB_LOGF(log, "Couldn't write to a region on behalf of a StoreInst"); 1316 error.SetErrorToGenericError(); 1317 error.SetErrorString(memory_write_error); 1318 return false; 1319 } 1320 1321 if (log) { 1322 LLDB_LOGF(log, "Interpreted a StoreInst"); 1323 LLDB_LOGF(log, " D : 0x%" PRIx64, D); 1324 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 1325 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 1326 } 1327 } break; 1328 case Instruction::Call: { 1329 const CallInst *call_inst = cast<CallInst>(inst); 1330 1331 if (CanIgnoreCall(call_inst)) 1332 break; 1333 1334 // Get the return type 1335 llvm::Type *returnType = call_inst->getType(); 1336 if (returnType == nullptr) { 1337 error.SetErrorToGenericError(); 1338 error.SetErrorString("unable to access return type"); 1339 return false; 1340 } 1341 1342 // Work with void, integer and pointer return types 1343 if (!returnType->isVoidTy() && !returnType->isIntegerTy() && 1344 !returnType->isPointerTy()) { 1345 error.SetErrorToGenericError(); 1346 error.SetErrorString("return type is not supported"); 1347 return false; 1348 } 1349 1350 // Check we can actually get a thread 1351 if (exe_ctx.GetThreadPtr() == nullptr) { 1352 error.SetErrorToGenericError(); 1353 error.SetErrorString("unable to acquire thread"); 1354 return false; 1355 } 1356 1357 // Make sure we have a valid process 1358 if (!exe_ctx.GetProcessPtr()) { 1359 error.SetErrorToGenericError(); 1360 error.SetErrorString("unable to get the process"); 1361 return false; 1362 } 1363 1364 // Find the address of the callee function 1365 lldb_private::Scalar I; 1366 const llvm::Value *val = call_inst->getCalledOperand(); 1367 1368 if (!frame.EvaluateValue(I, val, module)) { 1369 error.SetErrorToGenericError(); 1370 error.SetErrorString("unable to get address of function"); 1371 return false; 1372 } 1373 lldb_private::Address funcAddr(I.ULongLong(LLDB_INVALID_ADDRESS)); 1374 1375 lldb_private::DiagnosticManager diagnostics; 1376 lldb_private::EvaluateExpressionOptions options; 1377 1378 llvm::FunctionType *prototype = call_inst->getFunctionType(); 1379 1380 // Find number of arguments 1381 const int numArgs = call_inst->arg_size(); 1382 1383 // We work with a fixed array of 16 arguments which is our upper limit 1384 static lldb_private::ABI::CallArgument rawArgs[16]; 1385 if (numArgs >= 16) { 1386 error.SetErrorToGenericError(); 1387 error.SetErrorString("function takes too many arguments"); 1388 return false; 1389 } 1390 1391 // Push all function arguments to the argument list that will be passed 1392 // to the call function thread plan 1393 for (int i = 0; i < numArgs; i++) { 1394 // Get details of this argument 1395 llvm::Value *arg_op = call_inst->getArgOperand(i); 1396 llvm::Type *arg_ty = arg_op->getType(); 1397 1398 // Ensure that this argument is an supported type 1399 if (!arg_ty->isIntegerTy() && !arg_ty->isPointerTy()) { 1400 error.SetErrorToGenericError(); 1401 error.SetErrorStringWithFormat("argument %d must be integer type", i); 1402 return false; 1403 } 1404 1405 // Extract the arguments value 1406 lldb_private::Scalar tmp_op = 0; 1407 if (!frame.EvaluateValue(tmp_op, arg_op, module)) { 1408 error.SetErrorToGenericError(); 1409 error.SetErrorStringWithFormat("unable to evaluate argument %d", i); 1410 return false; 1411 } 1412 1413 // Check if this is a string literal or constant string pointer 1414 if (arg_ty->isPointerTy()) { 1415 lldb::addr_t addr = tmp_op.ULongLong(); 1416 size_t dataSize = 0; 1417 1418 bool Success = execution_unit.GetAllocSize(addr, dataSize); 1419 (void)Success; 1420 assert(Success && 1421 "unable to locate host data for transfer to device"); 1422 // Create the required buffer 1423 rawArgs[i].size = dataSize; 1424 rawArgs[i].data_up.reset(new uint8_t[dataSize + 1]); 1425 1426 // Read string from host memory 1427 execution_unit.ReadMemory(rawArgs[i].data_up.get(), addr, dataSize, 1428 error); 1429 assert(!error.Fail() && 1430 "we have failed to read the string from memory"); 1431 1432 // Add null terminator 1433 rawArgs[i].data_up[dataSize] = '\0'; 1434 rawArgs[i].type = lldb_private::ABI::CallArgument::HostPointer; 1435 } else /* if ( arg_ty->isPointerTy() ) */ 1436 { 1437 rawArgs[i].type = lldb_private::ABI::CallArgument::TargetValue; 1438 // Get argument size in bytes 1439 rawArgs[i].size = arg_ty->getIntegerBitWidth() / 8; 1440 // Push value into argument list for thread plan 1441 rawArgs[i].value = tmp_op.ULongLong(); 1442 } 1443 } 1444 1445 // Pack the arguments into an llvm::array 1446 llvm::ArrayRef<lldb_private::ABI::CallArgument> args(rawArgs, numArgs); 1447 1448 // Setup a thread plan to call the target function 1449 lldb::ThreadPlanSP call_plan_sp( 1450 new lldb_private::ThreadPlanCallFunctionUsingABI( 1451 exe_ctx.GetThreadRef(), funcAddr, *prototype, *returnType, args, 1452 options)); 1453 1454 // Check if the plan is valid 1455 lldb_private::StreamString ss; 1456 if (!call_plan_sp || !call_plan_sp->ValidatePlan(&ss)) { 1457 error.SetErrorToGenericError(); 1458 error.SetErrorStringWithFormat( 1459 "unable to make ThreadPlanCallFunctionUsingABI for 0x%llx", 1460 I.ULongLong()); 1461 return false; 1462 } 1463 1464 exe_ctx.GetProcessPtr()->SetRunningUserExpression(true); 1465 1466 // Execute the actual function call thread plan 1467 lldb::ExpressionResults res = exe_ctx.GetProcessRef().RunThreadPlan( 1468 exe_ctx, call_plan_sp, options, diagnostics); 1469 1470 // Check that the thread plan completed successfully 1471 if (res != lldb::ExpressionResults::eExpressionCompleted) { 1472 error.SetErrorToGenericError(); 1473 error.SetErrorString("ThreadPlanCallFunctionUsingABI failed"); 1474 return false; 1475 } 1476 1477 exe_ctx.GetProcessPtr()->SetRunningUserExpression(false); 1478 1479 // Void return type 1480 if (returnType->isVoidTy()) { 1481 // Cant assign to void types, so we leave the frame untouched 1482 } else 1483 // Integer or pointer return type 1484 if (returnType->isIntegerTy() || returnType->isPointerTy()) { 1485 // Get the encapsulated return value 1486 lldb::ValueObjectSP retVal = call_plan_sp.get()->GetReturnValueObject(); 1487 1488 lldb_private::Scalar returnVal = -1; 1489 lldb_private::ValueObject *vobj = retVal.get(); 1490 1491 // Check if the return value is valid 1492 if (vobj == nullptr || !retVal) { 1493 error.SetErrorToGenericError(); 1494 error.SetErrorString("unable to get the return value"); 1495 return false; 1496 } 1497 1498 // Extract the return value as a integer 1499 lldb_private::Value &value = vobj->GetValue(); 1500 returnVal = value.GetScalar(); 1501 1502 // Push the return value as the result 1503 frame.AssignValue(inst, returnVal, module); 1504 } 1505 } break; 1506 } 1507 1508 ++frame.m_ii; 1509 } 1510 1511 if (num_insts >= 4096) { 1512 error.SetErrorToGenericError(); 1513 error.SetErrorString(infinite_loop_error); 1514 return false; 1515 } 1516 1517 return false; 1518 } 1519