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/Log.h" 20 #include "lldb/Utility/Scalar.h" 21 #include "lldb/Utility/Status.h" 22 #include "lldb/Utility/StreamString.h" 23 24 #include "lldb/Target/ABI.h" 25 #include "lldb/Target/ExecutionContext.h" 26 #include "lldb/Target/Target.h" 27 #include "lldb/Target/Thread.h" 28 #include "lldb/Target/ThreadPlan.h" 29 #include "lldb/Target/ThreadPlanCallFunctionUsingABI.h" 30 31 #include "llvm/IR/Constants.h" 32 #include "llvm/IR/DataLayout.h" 33 #include "llvm/IR/Function.h" 34 #include "llvm/IR/Instructions.h" 35 #include "llvm/IR/Intrinsics.h" 36 #include "llvm/IR/LLVMContext.h" 37 #include "llvm/IR/Module.h" 38 #include "llvm/IR/Operator.h" 39 #include "llvm/Support/raw_ostream.h" 40 41 #include <map> 42 43 using namespace llvm; 44 45 static std::string PrintValue(const Value *value, bool truncate = false) { 46 std::string s; 47 raw_string_ostream rso(s); 48 value->print(rso); 49 rso.flush(); 50 if (truncate) 51 s.resize(s.length() - 1); 52 53 size_t offset; 54 while ((offset = s.find('\n')) != s.npos) 55 s.erase(offset, 1); 56 while (s[0] == ' ' || s[0] == '\t') 57 s.erase(0, 1); 58 59 return s; 60 } 61 62 static std::string PrintType(const Type *type, bool truncate = false) { 63 std::string s; 64 raw_string_ostream rso(s); 65 type->print(rso); 66 rso.flush(); 67 if (truncate) 68 s.resize(s.length() - 1); 69 return s; 70 } 71 72 static bool CanIgnoreCall(const CallInst *call) { 73 const llvm::Function *called_function = call->getCalledFunction(); 74 75 if (!called_function) 76 return false; 77 78 if (called_function->isIntrinsic()) { 79 switch (called_function->getIntrinsicID()) { 80 default: 81 break; 82 case llvm::Intrinsic::dbg_declare: 83 case llvm::Intrinsic::dbg_value: 84 return true; 85 } 86 } 87 88 return false; 89 } 90 91 class InterpreterStackFrame { 92 public: 93 typedef std::map<const Value *, lldb::addr_t> ValueMap; 94 95 ValueMap m_values; 96 DataLayout &m_target_data; 97 lldb_private::IRExecutionUnit &m_execution_unit; 98 const BasicBlock *m_bb; 99 const BasicBlock *m_prev_bb; 100 BasicBlock::const_iterator m_ii; 101 BasicBlock::const_iterator m_ie; 102 103 lldb::addr_t m_frame_process_address; 104 size_t m_frame_size; 105 lldb::addr_t m_stack_pointer; 106 107 lldb::ByteOrder m_byte_order; 108 size_t m_addr_byte_size; 109 110 InterpreterStackFrame(DataLayout &target_data, 111 lldb_private::IRExecutionUnit &execution_unit, 112 lldb::addr_t stack_frame_bottom, 113 lldb::addr_t stack_frame_top) 114 : m_target_data(target_data), m_execution_unit(execution_unit), 115 m_bb(nullptr), m_prev_bb(nullptr) { 116 m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle 117 : lldb::eByteOrderBig); 118 m_addr_byte_size = (target_data.getPointerSize(0)); 119 120 m_frame_process_address = stack_frame_bottom; 121 m_frame_size = stack_frame_top - stack_frame_bottom; 122 m_stack_pointer = stack_frame_top; 123 } 124 125 ~InterpreterStackFrame() {} 126 127 void Jump(const BasicBlock *bb) { 128 m_prev_bb = m_bb; 129 m_bb = bb; 130 m_ii = m_bb->begin(); 131 m_ie = m_bb->end(); 132 } 133 134 std::string SummarizeValue(const Value *value) { 135 lldb_private::StreamString ss; 136 137 ss.Printf("%s", PrintValue(value).c_str()); 138 139 ValueMap::iterator i = m_values.find(value); 140 141 if (i != m_values.end()) { 142 lldb::addr_t addr = i->second; 143 144 ss.Printf(" 0x%llx", (unsigned long long)addr); 145 } 146 147 return std::string(ss.GetString()); 148 } 149 150 bool AssignToMatchType(lldb_private::Scalar &scalar, uint64_t u64value, 151 Type *type) { 152 size_t type_size = m_target_data.getTypeStoreSize(type); 153 154 if (type_size > 8) 155 return false; 156 157 if (type_size != 1) 158 type_size = PowerOf2Ceil(type_size); 159 160 scalar = llvm::APInt(type_size*8, u64value); 161 return true; 162 } 163 164 bool EvaluateValue(lldb_private::Scalar &scalar, const Value *value, 165 Module &module) { 166 const Constant *constant = dyn_cast<Constant>(value); 167 168 if (constant) { 169 APInt value_apint; 170 171 if (!ResolveConstantValue(value_apint, constant)) 172 return false; 173 174 return AssignToMatchType(scalar, value_apint.getLimitedValue(), 175 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, u64value, value->getType()); 194 } 195 196 return false; 197 } 198 199 bool AssignValue(const Value *value, lldb_private::Scalar &scalar, 200 Module &module) { 201 lldb::addr_t process_address = ResolveValue(value, module); 202 203 if (process_address == LLDB_INVALID_ADDRESS) 204 return false; 205 206 lldb_private::Scalar cast_scalar; 207 208 if (!AssignToMatchType(cast_scalar, scalar.ULongLong(), value->getType())) 209 return false; 210 211 size_t value_byte_size = m_target_data.getTypeStoreSize(value->getType()); 212 213 lldb_private::DataBufferHeap buf(value_byte_size, 0); 214 215 lldb_private::Status get_data_error; 216 217 if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), 218 m_byte_order, get_data_error)) 219 return false; 220 221 lldb_private::Status write_error; 222 223 m_execution_unit.WriteMemory(process_address, buf.GetBytes(), 224 buf.GetByteSize(), write_error); 225 226 return write_error.Success(); 227 } 228 229 bool ResolveConstantValue(APInt &value, const Constant *constant) { 230 switch (constant->getValueID()) { 231 default: 232 break; 233 case Value::FunctionVal: 234 if (const Function *constant_func = dyn_cast<Function>(constant)) { 235 lldb_private::ConstString name(constant_func->getName()); 236 bool missing_weak = false; 237 lldb::addr_t addr = m_execution_unit.FindSymbol(name, missing_weak); 238 if (addr == LLDB_INVALID_ADDRESS || missing_weak) 239 return false; 240 value = APInt(m_target_data.getPointerSizeInBits(), addr); 241 return true; 242 } 243 break; 244 case Value::ConstantIntVal: 245 if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) { 246 value = constant_int->getValue(); 247 return true; 248 } 249 break; 250 case Value::ConstantFPVal: 251 if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) { 252 value = constant_fp->getValueAPF().bitcastToAPInt(); 253 return true; 254 } 255 break; 256 case Value::ConstantExprVal: 257 if (const ConstantExpr *constant_expr = 258 dyn_cast<ConstantExpr>(constant)) { 259 switch (constant_expr->getOpcode()) { 260 default: 261 return false; 262 case Instruction::IntToPtr: 263 case Instruction::PtrToInt: 264 case Instruction::BitCast: 265 return ResolveConstantValue(value, constant_expr->getOperand(0)); 266 case Instruction::GetElementPtr: { 267 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 268 ConstantExpr::const_op_iterator op_end = constant_expr->op_end(); 269 270 Constant *base = dyn_cast<Constant>(*op_cursor); 271 272 if (!base) 273 return false; 274 275 if (!ResolveConstantValue(value, base)) 276 return false; 277 278 op_cursor++; 279 280 if (op_cursor == op_end) 281 return true; // no offset to apply! 282 283 SmallVector<Value *, 8> indices(op_cursor, op_end); 284 285 Type *src_elem_ty = 286 cast<GEPOperator>(constant_expr)->getSourceElementType(); 287 uint64_t offset = 288 m_target_data.getIndexedOffsetInType(src_elem_ty, indices); 289 290 const bool is_signed = true; 291 value += APInt(value.getBitWidth(), offset, is_signed); 292 293 return true; 294 } 295 } 296 } 297 break; 298 case Value::ConstantPointerNullVal: 299 if (isa<ConstantPointerNull>(constant)) { 300 value = APInt(m_target_data.getPointerSizeInBits(), 0); 301 return true; 302 } 303 break; 304 } 305 return false; 306 } 307 308 bool MakeArgument(const Argument *value, uint64_t address) { 309 lldb::addr_t data_address = Malloc(value->getType()); 310 311 if (data_address == LLDB_INVALID_ADDRESS) 312 return false; 313 314 lldb_private::Status write_error; 315 316 m_execution_unit.WritePointerToMemory(data_address, address, write_error); 317 318 if (!write_error.Success()) { 319 lldb_private::Status free_error; 320 m_execution_unit.Free(data_address, free_error); 321 return false; 322 } 323 324 m_values[value] = data_address; 325 326 lldb_private::Log *log( 327 lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); 328 329 if (log) { 330 LLDB_LOGF(log, "Made an allocation for argument %s", 331 PrintValue(value).c_str()); 332 LLDB_LOGF(log, " Data region : %llx", (unsigned long long)address); 333 LLDB_LOGF(log, " Ref region : %llx", 334 (unsigned long long)data_address); 335 } 336 337 return true; 338 } 339 340 bool ResolveConstant(lldb::addr_t process_address, const Constant *constant) { 341 APInt resolved_value; 342 343 if (!ResolveConstantValue(resolved_value, constant)) 344 return false; 345 346 size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); 347 lldb_private::DataBufferHeap buf(constant_size, 0); 348 349 lldb_private::Status get_data_error; 350 351 lldb_private::Scalar resolved_scalar( 352 resolved_value.zextOrTrunc(llvm::NextPowerOf2(constant_size) * 8)); 353 if (!resolved_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), 354 m_byte_order, get_data_error)) 355 return false; 356 357 lldb_private::Status write_error; 358 359 m_execution_unit.WriteMemory(process_address, buf.GetBytes(), 360 buf.GetByteSize(), write_error); 361 362 return write_error.Success(); 363 } 364 365 lldb::addr_t Malloc(size_t size, uint8_t byte_alignment) { 366 lldb::addr_t ret = m_stack_pointer; 367 368 ret -= size; 369 ret -= (ret % byte_alignment); 370 371 if (ret < m_frame_process_address) 372 return LLDB_INVALID_ADDRESS; 373 374 m_stack_pointer = ret; 375 return ret; 376 } 377 378 lldb::addr_t Malloc(llvm::Type *type) { 379 lldb_private::Status alloc_error; 380 381 return Malloc(m_target_data.getTypeAllocSize(type), 382 m_target_data.getPrefTypeAlignment(type)); 383 } 384 385 std::string PrintData(lldb::addr_t addr, llvm::Type *type) { 386 size_t length = m_target_data.getTypeStoreSize(type); 387 388 lldb_private::DataBufferHeap buf(length, 0); 389 390 lldb_private::Status read_error; 391 392 m_execution_unit.ReadMemory(buf.GetBytes(), addr, length, read_error); 393 394 if (!read_error.Success()) 395 return std::string("<couldn't read data>"); 396 397 lldb_private::StreamString ss; 398 399 for (size_t i = 0; i < length; i++) { 400 if ((!(i & 0xf)) && i) 401 ss.Printf("%02hhx - ", buf.GetBytes()[i]); 402 else 403 ss.Printf("%02hhx ", buf.GetBytes()[i]); 404 } 405 406 return std::string(ss.GetString()); 407 } 408 409 lldb::addr_t ResolveValue(const Value *value, Module &module) { 410 ValueMap::iterator i = m_values.find(value); 411 412 if (i != m_values.end()) 413 return i->second; 414 415 // Fall back and allocate space [allocation type Alloca] 416 417 lldb::addr_t data_address = Malloc(value->getType()); 418 419 if (const Constant *constant = dyn_cast<Constant>(value)) { 420 if (!ResolveConstant(data_address, constant)) { 421 lldb_private::Status free_error; 422 m_execution_unit.Free(data_address, free_error); 423 return LLDB_INVALID_ADDRESS; 424 } 425 } 426 427 m_values[value] = data_address; 428 return data_address; 429 } 430 }; 431 432 static const char *unsupported_opcode_error = 433 "Interpreter doesn't handle one of the expression's opcodes"; 434 static const char *unsupported_operand_error = 435 "Interpreter doesn't handle one of the expression's operands"; 436 static const char *interpreter_internal_error = 437 "Interpreter encountered an internal error"; 438 static const char *bad_value_error = 439 "Interpreter couldn't resolve a value during execution"; 440 static const char *memory_allocation_error = 441 "Interpreter couldn't allocate memory"; 442 static const char *memory_write_error = "Interpreter couldn't write to memory"; 443 static const char *memory_read_error = "Interpreter couldn't read from memory"; 444 static const char *infinite_loop_error = "Interpreter ran for too many cycles"; 445 static const char *too_many_functions_error = 446 "Interpreter doesn't handle modules with multiple function bodies."; 447 448 static bool CanResolveConstant(llvm::Constant *constant) { 449 switch (constant->getValueID()) { 450 default: 451 return false; 452 case Value::ConstantIntVal: 453 case Value::ConstantFPVal: 454 case Value::FunctionVal: 455 return true; 456 case Value::ConstantExprVal: 457 if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) { 458 switch (constant_expr->getOpcode()) { 459 default: 460 return false; 461 case Instruction::IntToPtr: 462 case Instruction::PtrToInt: 463 case Instruction::BitCast: 464 return CanResolveConstant(constant_expr->getOperand(0)); 465 case Instruction::GetElementPtr: { 466 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 467 Constant *base = dyn_cast<Constant>(*op_cursor); 468 if (!base) 469 return false; 470 471 return CanResolveConstant(base); 472 } 473 } 474 } else { 475 return false; 476 } 477 case Value::ConstantPointerNullVal: 478 return true; 479 } 480 } 481 482 bool IRInterpreter::CanInterpret(llvm::Module &module, llvm::Function &function, 483 lldb_private::Status &error, 484 const bool support_function_calls) { 485 lldb_private::Log *log( 486 lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); 487 488 bool saw_function_with_body = false; 489 for (Function &f : module) { 490 if (f.begin() != f.end()) { 491 if (saw_function_with_body) { 492 LLDB_LOGF(log, "More than one function in the module has a body"); 493 error.SetErrorToGenericError(); 494 error.SetErrorString(too_many_functions_error); 495 return false; 496 } 497 saw_function_with_body = true; 498 } 499 } 500 501 for (BasicBlock &bb : function) { 502 for (Instruction &ii : bb) { 503 switch (ii.getOpcode()) { 504 default: { 505 LLDB_LOGF(log, "Unsupported instruction: %s", PrintValue(&ii).c_str()); 506 error.SetErrorToGenericError(); 507 error.SetErrorString(unsupported_opcode_error); 508 return false; 509 } 510 case Instruction::Add: 511 case Instruction::Alloca: 512 case Instruction::BitCast: 513 case Instruction::Br: 514 case Instruction::PHI: 515 break; 516 case Instruction::Call: { 517 CallInst *call_inst = dyn_cast<CallInst>(&ii); 518 519 if (!call_inst) { 520 error.SetErrorToGenericError(); 521 error.SetErrorString(interpreter_internal_error); 522 return false; 523 } 524 525 if (!CanIgnoreCall(call_inst) && !support_function_calls) { 526 LLDB_LOGF(log, "Unsupported instruction: %s", 527 PrintValue(&ii).c_str()); 528 error.SetErrorToGenericError(); 529 error.SetErrorString(unsupported_opcode_error); 530 return false; 531 } 532 } break; 533 case Instruction::GetElementPtr: 534 break; 535 case Instruction::ICmp: { 536 ICmpInst *icmp_inst = dyn_cast<ICmpInst>(&ii); 537 538 if (!icmp_inst) { 539 error.SetErrorToGenericError(); 540 error.SetErrorString(interpreter_internal_error); 541 return false; 542 } 543 544 switch (icmp_inst->getPredicate()) { 545 default: { 546 LLDB_LOGF(log, "Unsupported ICmp predicate: %s", 547 PrintValue(&ii).c_str()); 548 549 error.SetErrorToGenericError(); 550 error.SetErrorString(unsupported_opcode_error); 551 return false; 552 } 553 case CmpInst::ICMP_EQ: 554 case CmpInst::ICMP_NE: 555 case CmpInst::ICMP_UGT: 556 case CmpInst::ICMP_UGE: 557 case CmpInst::ICMP_ULT: 558 case CmpInst::ICMP_ULE: 559 case CmpInst::ICMP_SGT: 560 case CmpInst::ICMP_SGE: 561 case CmpInst::ICMP_SLT: 562 case CmpInst::ICMP_SLE: 563 break; 564 } 565 } break; 566 case Instruction::And: 567 case Instruction::AShr: 568 case Instruction::IntToPtr: 569 case Instruction::PtrToInt: 570 case Instruction::Load: 571 case Instruction::LShr: 572 case Instruction::Mul: 573 case Instruction::Or: 574 case Instruction::Ret: 575 case Instruction::SDiv: 576 case Instruction::SExt: 577 case Instruction::Shl: 578 case Instruction::SRem: 579 case Instruction::Store: 580 case Instruction::Sub: 581 case Instruction::Trunc: 582 case Instruction::UDiv: 583 case Instruction::URem: 584 case Instruction::Xor: 585 case Instruction::ZExt: 586 break; 587 } 588 589 for (unsigned oi = 0, oe = ii.getNumOperands(); oi != oe; ++oi) { 590 Value *operand = ii.getOperand(oi); 591 Type *operand_type = operand->getType(); 592 593 switch (operand_type->getTypeID()) { 594 default: 595 break; 596 case Type::FixedVectorTyID: 597 case Type::ScalableVectorTyID: { 598 LLDB_LOGF(log, "Unsupported operand type: %s", 599 PrintType(operand_type).c_str()); 600 error.SetErrorString(unsupported_operand_error); 601 return false; 602 } 603 } 604 605 // The IR interpreter currently doesn't know about 606 // 128-bit integers. As they're not that frequent, 607 // we can just fall back to the JIT rather than 608 // choking. 609 if (operand_type->getPrimitiveSizeInBits() > 64) { 610 LLDB_LOGF(log, "Unsupported operand type: %s", 611 PrintType(operand_type).c_str()); 612 error.SetErrorString(unsupported_operand_error); 613 return false; 614 } 615 616 if (Constant *constant = llvm::dyn_cast<Constant>(operand)) { 617 if (!CanResolveConstant(constant)) { 618 LLDB_LOGF(log, "Unsupported constant: %s", 619 PrintValue(constant).c_str()); 620 error.SetErrorString(unsupported_operand_error); 621 return false; 622 } 623 } 624 } 625 } 626 } 627 628 return true; 629 } 630 631 bool IRInterpreter::Interpret(llvm::Module &module, llvm::Function &function, 632 llvm::ArrayRef<lldb::addr_t> args, 633 lldb_private::IRExecutionUnit &execution_unit, 634 lldb_private::Status &error, 635 lldb::addr_t stack_frame_bottom, 636 lldb::addr_t stack_frame_top, 637 lldb_private::ExecutionContext &exe_ctx) { 638 lldb_private::Log *log( 639 lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); 640 641 if (log) { 642 std::string s; 643 raw_string_ostream oss(s); 644 645 module.print(oss, nullptr); 646 647 oss.flush(); 648 649 LLDB_LOGF(log, "Module as passed in to IRInterpreter::Interpret: \n\"%s\"", 650 s.c_str()); 651 } 652 653 DataLayout data_layout(&module); 654 655 InterpreterStackFrame frame(data_layout, execution_unit, stack_frame_bottom, 656 stack_frame_top); 657 658 if (frame.m_frame_process_address == LLDB_INVALID_ADDRESS) { 659 error.SetErrorString("Couldn't allocate stack frame"); 660 } 661 662 int arg_index = 0; 663 664 for (llvm::Function::arg_iterator ai = function.arg_begin(), 665 ae = function.arg_end(); 666 ai != ae; ++ai, ++arg_index) { 667 if (args.size() <= static_cast<size_t>(arg_index)) { 668 error.SetErrorString("Not enough arguments passed in to function"); 669 return false; 670 } 671 672 lldb::addr_t ptr = args[arg_index]; 673 674 frame.MakeArgument(&*ai, ptr); 675 } 676 677 uint32_t num_insts = 0; 678 679 frame.Jump(&function.front()); 680 681 while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) { 682 const Instruction *inst = &*frame.m_ii; 683 684 LLDB_LOGF(log, "Interpreting %s", PrintValue(inst).c_str()); 685 686 switch (inst->getOpcode()) { 687 default: 688 break; 689 690 case Instruction::Add: 691 case Instruction::Sub: 692 case Instruction::Mul: 693 case Instruction::SDiv: 694 case Instruction::UDiv: 695 case Instruction::SRem: 696 case Instruction::URem: 697 case Instruction::Shl: 698 case Instruction::LShr: 699 case Instruction::AShr: 700 case Instruction::And: 701 case Instruction::Or: 702 case Instruction::Xor: { 703 const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst); 704 705 if (!bin_op) { 706 LLDB_LOGF( 707 log, 708 "getOpcode() returns %s, but instruction is not a BinaryOperator", 709 inst->getOpcodeName()); 710 error.SetErrorToGenericError(); 711 error.SetErrorString(interpreter_internal_error); 712 return false; 713 } 714 715 Value *lhs = inst->getOperand(0); 716 Value *rhs = inst->getOperand(1); 717 718 lldb_private::Scalar L; 719 lldb_private::Scalar R; 720 721 if (!frame.EvaluateValue(L, lhs, module)) { 722 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); 723 error.SetErrorToGenericError(); 724 error.SetErrorString(bad_value_error); 725 return false; 726 } 727 728 if (!frame.EvaluateValue(R, rhs, module)) { 729 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str()); 730 error.SetErrorToGenericError(); 731 error.SetErrorString(bad_value_error); 732 return false; 733 } 734 735 lldb_private::Scalar result; 736 737 switch (inst->getOpcode()) { 738 default: 739 break; 740 case Instruction::Add: 741 result = L + R; 742 break; 743 case Instruction::Mul: 744 result = L * R; 745 break; 746 case Instruction::Sub: 747 result = L - R; 748 break; 749 case Instruction::SDiv: 750 L.MakeSigned(); 751 R.MakeSigned(); 752 result = L / R; 753 break; 754 case Instruction::UDiv: 755 L.MakeUnsigned(); 756 R.MakeUnsigned(); 757 result = L / R; 758 break; 759 case Instruction::SRem: 760 L.MakeSigned(); 761 R.MakeSigned(); 762 result = L % R; 763 break; 764 case Instruction::URem: 765 L.MakeUnsigned(); 766 R.MakeUnsigned(); 767 result = L % R; 768 break; 769 case Instruction::Shl: 770 result = L << R; 771 break; 772 case Instruction::AShr: 773 result = L >> R; 774 break; 775 case Instruction::LShr: 776 result = L; 777 result.ShiftRightLogical(R); 778 break; 779 case Instruction::And: 780 result = L & R; 781 break; 782 case Instruction::Or: 783 result = L | R; 784 break; 785 case Instruction::Xor: 786 result = L ^ R; 787 break; 788 } 789 790 frame.AssignValue(inst, result, module); 791 792 if (log) { 793 LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); 794 LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); 795 LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); 796 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 797 } 798 } break; 799 case Instruction::Alloca: { 800 const AllocaInst *alloca_inst = cast<AllocaInst>(inst); 801 802 if (alloca_inst->isArrayAllocation()) { 803 LLDB_LOGF(log, 804 "AllocaInsts are not handled if isArrayAllocation() is true"); 805 error.SetErrorToGenericError(); 806 error.SetErrorString(unsupported_opcode_error); 807 return false; 808 } 809 810 // The semantics of Alloca are: 811 // Create a region R of virtual memory of type T, backed by a data 812 // buffer 813 // Create a region P of virtual memory of type T*, backed by a data 814 // buffer 815 // Write the virtual address of R into P 816 817 Type *T = alloca_inst->getAllocatedType(); 818 Type *Tptr = alloca_inst->getType(); 819 820 lldb::addr_t R = frame.Malloc(T); 821 822 if (R == LLDB_INVALID_ADDRESS) { 823 LLDB_LOGF(log, "Couldn't allocate memory for an AllocaInst"); 824 error.SetErrorToGenericError(); 825 error.SetErrorString(memory_allocation_error); 826 return false; 827 } 828 829 lldb::addr_t P = frame.Malloc(Tptr); 830 831 if (P == LLDB_INVALID_ADDRESS) { 832 LLDB_LOGF(log, 833 "Couldn't allocate the result pointer for an AllocaInst"); 834 error.SetErrorToGenericError(); 835 error.SetErrorString(memory_allocation_error); 836 return false; 837 } 838 839 lldb_private::Status write_error; 840 841 execution_unit.WritePointerToMemory(P, R, write_error); 842 843 if (!write_error.Success()) { 844 LLDB_LOGF(log, "Couldn't write the result pointer for an AllocaInst"); 845 error.SetErrorToGenericError(); 846 error.SetErrorString(memory_write_error); 847 lldb_private::Status free_error; 848 execution_unit.Free(P, free_error); 849 execution_unit.Free(R, free_error); 850 return false; 851 } 852 853 frame.m_values[alloca_inst] = P; 854 855 if (log) { 856 LLDB_LOGF(log, "Interpreted an AllocaInst"); 857 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 858 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 859 } 860 } break; 861 case Instruction::BitCast: 862 case Instruction::ZExt: { 863 const CastInst *cast_inst = cast<CastInst>(inst); 864 865 Value *source = cast_inst->getOperand(0); 866 867 lldb_private::Scalar S; 868 869 if (!frame.EvaluateValue(S, source, module)) { 870 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str()); 871 error.SetErrorToGenericError(); 872 error.SetErrorString(bad_value_error); 873 return false; 874 } 875 876 frame.AssignValue(inst, S, module); 877 } break; 878 case Instruction::SExt: { 879 const CastInst *cast_inst = cast<CastInst>(inst); 880 881 Value *source = cast_inst->getOperand(0); 882 883 lldb_private::Scalar S; 884 885 if (!frame.EvaluateValue(S, source, module)) { 886 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(source).c_str()); 887 error.SetErrorToGenericError(); 888 error.SetErrorString(bad_value_error); 889 return false; 890 } 891 892 S.MakeSigned(); 893 894 lldb_private::Scalar S_signextend(S.SLongLong()); 895 896 frame.AssignValue(inst, S_signextend, module); 897 } break; 898 case Instruction::Br: { 899 const BranchInst *br_inst = cast<BranchInst>(inst); 900 901 if (br_inst->isConditional()) { 902 Value *condition = br_inst->getCondition(); 903 904 lldb_private::Scalar C; 905 906 if (!frame.EvaluateValue(C, condition, module)) { 907 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(condition).c_str()); 908 error.SetErrorToGenericError(); 909 error.SetErrorString(bad_value_error); 910 return false; 911 } 912 913 if (!C.IsZero()) 914 frame.Jump(br_inst->getSuccessor(0)); 915 else 916 frame.Jump(br_inst->getSuccessor(1)); 917 918 if (log) { 919 LLDB_LOGF(log, "Interpreted a BrInst with a condition"); 920 LLDB_LOGF(log, " cond : %s", 921 frame.SummarizeValue(condition).c_str()); 922 } 923 } else { 924 frame.Jump(br_inst->getSuccessor(0)); 925 926 if (log) { 927 LLDB_LOGF(log, "Interpreted a BrInst with no condition"); 928 } 929 } 930 } 931 continue; 932 case Instruction::PHI: { 933 const PHINode *phi_inst = cast<PHINode>(inst); 934 if (!frame.m_prev_bb) { 935 LLDB_LOGF(log, 936 "Encountered PHI node without having jumped from another " 937 "basic block"); 938 error.SetErrorToGenericError(); 939 error.SetErrorString(interpreter_internal_error); 940 return false; 941 } 942 943 Value *value = phi_inst->getIncomingValueForBlock(frame.m_prev_bb); 944 lldb_private::Scalar result; 945 if (!frame.EvaluateValue(result, value, module)) { 946 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(value).c_str()); 947 error.SetErrorToGenericError(); 948 error.SetErrorString(bad_value_error); 949 return false; 950 } 951 frame.AssignValue(inst, result, module); 952 953 if (log) { 954 LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); 955 LLDB_LOGF(log, " Incoming value : %s", 956 frame.SummarizeValue(value).c_str()); 957 } 958 } break; 959 case Instruction::GetElementPtr: { 960 const GetElementPtrInst *gep_inst = cast<GetElementPtrInst>(inst); 961 962 const Value *pointer_operand = gep_inst->getPointerOperand(); 963 Type *src_elem_ty = gep_inst->getSourceElementType(); 964 965 lldb_private::Scalar P; 966 967 if (!frame.EvaluateValue(P, pointer_operand, module)) { 968 LLDB_LOGF(log, "Couldn't evaluate %s", 969 PrintValue(pointer_operand).c_str()); 970 error.SetErrorToGenericError(); 971 error.SetErrorString(bad_value_error); 972 return false; 973 } 974 975 typedef SmallVector<Value *, 8> IndexVector; 976 typedef IndexVector::iterator IndexIterator; 977 978 SmallVector<Value *, 8> indices(gep_inst->idx_begin(), 979 gep_inst->idx_end()); 980 981 SmallVector<Value *, 8> const_indices; 982 983 for (IndexIterator ii = indices.begin(), ie = indices.end(); ii != ie; 984 ++ii) { 985 ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii); 986 987 if (!constant_index) { 988 lldb_private::Scalar I; 989 990 if (!frame.EvaluateValue(I, *ii, module)) { 991 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(*ii).c_str()); 992 error.SetErrorToGenericError(); 993 error.SetErrorString(bad_value_error); 994 return false; 995 } 996 997 LLDB_LOGF(log, "Evaluated constant index %s as %llu", 998 PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS)); 999 1000 constant_index = cast<ConstantInt>(ConstantInt::get( 1001 (*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS))); 1002 } 1003 1004 const_indices.push_back(constant_index); 1005 } 1006 1007 uint64_t offset = 1008 data_layout.getIndexedOffsetInType(src_elem_ty, const_indices); 1009 1010 lldb_private::Scalar Poffset = P + offset; 1011 1012 frame.AssignValue(inst, Poffset, module); 1013 1014 if (log) { 1015 LLDB_LOGF(log, "Interpreted a GetElementPtrInst"); 1016 LLDB_LOGF(log, " P : %s", 1017 frame.SummarizeValue(pointer_operand).c_str()); 1018 LLDB_LOGF(log, " Poffset : %s", frame.SummarizeValue(inst).c_str()); 1019 } 1020 } break; 1021 case Instruction::ICmp: { 1022 const ICmpInst *icmp_inst = cast<ICmpInst>(inst); 1023 1024 CmpInst::Predicate predicate = icmp_inst->getPredicate(); 1025 1026 Value *lhs = inst->getOperand(0); 1027 Value *rhs = inst->getOperand(1); 1028 1029 lldb_private::Scalar L; 1030 lldb_private::Scalar R; 1031 1032 if (!frame.EvaluateValue(L, lhs, module)) { 1033 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); 1034 error.SetErrorToGenericError(); 1035 error.SetErrorString(bad_value_error); 1036 return false; 1037 } 1038 1039 if (!frame.EvaluateValue(R, rhs, module)) { 1040 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(rhs).c_str()); 1041 error.SetErrorToGenericError(); 1042 error.SetErrorString(bad_value_error); 1043 return false; 1044 } 1045 1046 lldb_private::Scalar result; 1047 1048 switch (predicate) { 1049 default: 1050 return false; 1051 case CmpInst::ICMP_EQ: 1052 result = (L == R); 1053 break; 1054 case CmpInst::ICMP_NE: 1055 result = (L != R); 1056 break; 1057 case CmpInst::ICMP_UGT: 1058 L.MakeUnsigned(); 1059 R.MakeUnsigned(); 1060 result = (L > R); 1061 break; 1062 case CmpInst::ICMP_UGE: 1063 L.MakeUnsigned(); 1064 R.MakeUnsigned(); 1065 result = (L >= R); 1066 break; 1067 case CmpInst::ICMP_ULT: 1068 L.MakeUnsigned(); 1069 R.MakeUnsigned(); 1070 result = (L < R); 1071 break; 1072 case CmpInst::ICMP_ULE: 1073 L.MakeUnsigned(); 1074 R.MakeUnsigned(); 1075 result = (L <= R); 1076 break; 1077 case CmpInst::ICMP_SGT: 1078 L.MakeSigned(); 1079 R.MakeSigned(); 1080 result = (L > R); 1081 break; 1082 case CmpInst::ICMP_SGE: 1083 L.MakeSigned(); 1084 R.MakeSigned(); 1085 result = (L >= R); 1086 break; 1087 case CmpInst::ICMP_SLT: 1088 L.MakeSigned(); 1089 R.MakeSigned(); 1090 result = (L < R); 1091 break; 1092 case CmpInst::ICMP_SLE: 1093 L.MakeSigned(); 1094 R.MakeSigned(); 1095 result = (L <= R); 1096 break; 1097 } 1098 1099 frame.AssignValue(inst, result, module); 1100 1101 if (log) { 1102 LLDB_LOGF(log, "Interpreted an ICmpInst"); 1103 LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); 1104 LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); 1105 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1106 } 1107 } break; 1108 case Instruction::IntToPtr: { 1109 const IntToPtrInst *int_to_ptr_inst = cast<IntToPtrInst>(inst); 1110 1111 Value *src_operand = int_to_ptr_inst->getOperand(0); 1112 1113 lldb_private::Scalar I; 1114 1115 if (!frame.EvaluateValue(I, src_operand, module)) { 1116 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1117 error.SetErrorToGenericError(); 1118 error.SetErrorString(bad_value_error); 1119 return false; 1120 } 1121 1122 frame.AssignValue(inst, I, module); 1123 1124 if (log) { 1125 LLDB_LOGF(log, "Interpreted an IntToPtr"); 1126 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1127 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1128 } 1129 } break; 1130 case Instruction::PtrToInt: { 1131 const PtrToIntInst *ptr_to_int_inst = cast<PtrToIntInst>(inst); 1132 1133 Value *src_operand = ptr_to_int_inst->getOperand(0); 1134 1135 lldb_private::Scalar I; 1136 1137 if (!frame.EvaluateValue(I, src_operand, module)) { 1138 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1139 error.SetErrorToGenericError(); 1140 error.SetErrorString(bad_value_error); 1141 return false; 1142 } 1143 1144 frame.AssignValue(inst, I, module); 1145 1146 if (log) { 1147 LLDB_LOGF(log, "Interpreted a PtrToInt"); 1148 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1149 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1150 } 1151 } break; 1152 case Instruction::Trunc: { 1153 const TruncInst *trunc_inst = cast<TruncInst>(inst); 1154 1155 Value *src_operand = trunc_inst->getOperand(0); 1156 1157 lldb_private::Scalar I; 1158 1159 if (!frame.EvaluateValue(I, src_operand, module)) { 1160 LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(src_operand).c_str()); 1161 error.SetErrorToGenericError(); 1162 error.SetErrorString(bad_value_error); 1163 return false; 1164 } 1165 1166 frame.AssignValue(inst, I, module); 1167 1168 if (log) { 1169 LLDB_LOGF(log, "Interpreted a Trunc"); 1170 LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); 1171 LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); 1172 } 1173 } break; 1174 case Instruction::Load: { 1175 const LoadInst *load_inst = cast<LoadInst>(inst); 1176 1177 // The semantics of Load are: 1178 // Create a region D that will contain the loaded data 1179 // Resolve the region P containing a pointer 1180 // Dereference P to get the region R that the data should be loaded from 1181 // Transfer a unit of type type(D) from R to D 1182 1183 const Value *pointer_operand = load_inst->getPointerOperand(); 1184 1185 Type *pointer_ty = pointer_operand->getType(); 1186 PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); 1187 if (!pointer_ptr_ty) { 1188 LLDB_LOGF(log, "getPointerOperand()->getType() is not a PointerType"); 1189 error.SetErrorToGenericError(); 1190 error.SetErrorString(interpreter_internal_error); 1191 return false; 1192 } 1193 Type *target_ty = pointer_ptr_ty->getElementType(); 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 size_t target_size = data_layout.getTypeStoreSize(target_ty); 1224 lldb_private::DataBufferHeap buffer(target_size, 0); 1225 1226 read_error.Clear(); 1227 execution_unit.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), 1228 read_error); 1229 if (!read_error.Success()) { 1230 LLDB_LOGF(log, "Couldn't read from a region on behalf of a LoadInst"); 1231 error.SetErrorToGenericError(); 1232 error.SetErrorString(memory_read_error); 1233 return false; 1234 } 1235 1236 lldb_private::Status write_error; 1237 execution_unit.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), 1238 write_error); 1239 if (!write_error.Success()) { 1240 LLDB_LOGF(log, "Couldn't write to a region on behalf of a LoadInst"); 1241 error.SetErrorToGenericError(); 1242 error.SetErrorString(memory_read_error); 1243 return false; 1244 } 1245 1246 if (log) { 1247 LLDB_LOGF(log, "Interpreted a LoadInst"); 1248 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 1249 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 1250 LLDB_LOGF(log, " D : 0x%" PRIx64, D); 1251 } 1252 } break; 1253 case Instruction::Ret: { 1254 return true; 1255 } 1256 case Instruction::Store: { 1257 const StoreInst *store_inst = cast<StoreInst>(inst); 1258 1259 // The semantics of Store are: 1260 // Resolve the region D containing the data to be stored 1261 // Resolve the region P containing a pointer 1262 // Dereference P to get the region R that the data should be stored in 1263 // Transfer a unit of type type(D) from D to R 1264 1265 const Value *value_operand = store_inst->getValueOperand(); 1266 const Value *pointer_operand = store_inst->getPointerOperand(); 1267 1268 Type *pointer_ty = pointer_operand->getType(); 1269 PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); 1270 if (!pointer_ptr_ty) 1271 return false; 1272 Type *target_ty = pointer_ptr_ty->getElementType(); 1273 1274 lldb::addr_t D = frame.ResolveValue(value_operand, module); 1275 lldb::addr_t P = frame.ResolveValue(pointer_operand, module); 1276 1277 if (D == LLDB_INVALID_ADDRESS) { 1278 LLDB_LOGF(log, "StoreInst's value doesn't resolve to anything"); 1279 error.SetErrorToGenericError(); 1280 error.SetErrorString(bad_value_error); 1281 return false; 1282 } 1283 1284 if (P == LLDB_INVALID_ADDRESS) { 1285 LLDB_LOGF(log, "StoreInst's pointer doesn't resolve to anything"); 1286 error.SetErrorToGenericError(); 1287 error.SetErrorString(bad_value_error); 1288 return false; 1289 } 1290 1291 lldb::addr_t R; 1292 lldb_private::Status read_error; 1293 execution_unit.ReadPointerFromMemory(&R, P, read_error); 1294 1295 if (!read_error.Success()) { 1296 LLDB_LOGF(log, "Couldn't read the address to be loaded for a LoadInst"); 1297 error.SetErrorToGenericError(); 1298 error.SetErrorString(memory_read_error); 1299 return false; 1300 } 1301 1302 size_t target_size = data_layout.getTypeStoreSize(target_ty); 1303 lldb_private::DataBufferHeap buffer(target_size, 0); 1304 1305 read_error.Clear(); 1306 execution_unit.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), 1307 read_error); 1308 if (!read_error.Success()) { 1309 LLDB_LOGF(log, "Couldn't read from a region on behalf of a StoreInst"); 1310 error.SetErrorToGenericError(); 1311 error.SetErrorString(memory_read_error); 1312 return false; 1313 } 1314 1315 lldb_private::Status write_error; 1316 execution_unit.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), 1317 write_error); 1318 if (!write_error.Success()) { 1319 LLDB_LOGF(log, "Couldn't write to a region on behalf of a StoreInst"); 1320 error.SetErrorToGenericError(); 1321 error.SetErrorString(memory_write_error); 1322 return false; 1323 } 1324 1325 if (log) { 1326 LLDB_LOGF(log, "Interpreted a StoreInst"); 1327 LLDB_LOGF(log, " D : 0x%" PRIx64, D); 1328 LLDB_LOGF(log, " P : 0x%" PRIx64, P); 1329 LLDB_LOGF(log, " R : 0x%" PRIx64, R); 1330 } 1331 } break; 1332 case Instruction::Call: { 1333 const CallInst *call_inst = cast<CallInst>(inst); 1334 1335 if (CanIgnoreCall(call_inst)) 1336 break; 1337 1338 // Get the return type 1339 llvm::Type *returnType = call_inst->getType(); 1340 if (returnType == nullptr) { 1341 error.SetErrorToGenericError(); 1342 error.SetErrorString("unable to access return type"); 1343 return false; 1344 } 1345 1346 // Work with void, integer and pointer return types 1347 if (!returnType->isVoidTy() && !returnType->isIntegerTy() && 1348 !returnType->isPointerTy()) { 1349 error.SetErrorToGenericError(); 1350 error.SetErrorString("return type is not supported"); 1351 return false; 1352 } 1353 1354 // Check we can actually get a thread 1355 if (exe_ctx.GetThreadPtr() == nullptr) { 1356 error.SetErrorToGenericError(); 1357 error.SetErrorStringWithFormat("unable to acquire thread"); 1358 return false; 1359 } 1360 1361 // Make sure we have a valid process 1362 if (!exe_ctx.GetProcessPtr()) { 1363 error.SetErrorToGenericError(); 1364 error.SetErrorStringWithFormat("unable to get the process"); 1365 return false; 1366 } 1367 1368 // Find the address of the callee function 1369 lldb_private::Scalar I; 1370 const llvm::Value *val = call_inst->getCalledOperand(); 1371 1372 if (!frame.EvaluateValue(I, val, module)) { 1373 error.SetErrorToGenericError(); 1374 error.SetErrorString("unable to get address of function"); 1375 return false; 1376 } 1377 lldb_private::Address funcAddr(I.ULongLong(LLDB_INVALID_ADDRESS)); 1378 1379 lldb_private::DiagnosticManager diagnostics; 1380 lldb_private::EvaluateExpressionOptions options; 1381 1382 // We generally receive a function pointer which we must dereference 1383 llvm::Type *prototype = val->getType(); 1384 if (!prototype->isPointerTy()) { 1385 error.SetErrorToGenericError(); 1386 error.SetErrorString("call need function pointer"); 1387 return false; 1388 } 1389 1390 // Dereference the function pointer 1391 prototype = prototype->getPointerElementType(); 1392 if (!(prototype->isFunctionTy() || prototype->isFunctionVarArg())) { 1393 error.SetErrorToGenericError(); 1394 error.SetErrorString("call need function pointer"); 1395 return false; 1396 } 1397 1398 // Find number of arguments 1399 const int numArgs = call_inst->getNumArgOperands(); 1400 1401 // We work with a fixed array of 16 arguments which is our upper limit 1402 static lldb_private::ABI::CallArgument rawArgs[16]; 1403 if (numArgs >= 16) { 1404 error.SetErrorToGenericError(); 1405 error.SetErrorStringWithFormat("function takes too many arguments"); 1406 return false; 1407 } 1408 1409 // Push all function arguments to the argument list that will be passed 1410 // to the call function thread plan 1411 for (int i = 0; i < numArgs; i++) { 1412 // Get details of this argument 1413 llvm::Value *arg_op = call_inst->getArgOperand(i); 1414 llvm::Type *arg_ty = arg_op->getType(); 1415 1416 // Ensure that this argument is an supported type 1417 if (!arg_ty->isIntegerTy() && !arg_ty->isPointerTy()) { 1418 error.SetErrorToGenericError(); 1419 error.SetErrorStringWithFormat("argument %d must be integer type", i); 1420 return false; 1421 } 1422 1423 // Extract the arguments value 1424 lldb_private::Scalar tmp_op = 0; 1425 if (!frame.EvaluateValue(tmp_op, arg_op, module)) { 1426 error.SetErrorToGenericError(); 1427 error.SetErrorStringWithFormat("unable to evaluate argument %d", i); 1428 return false; 1429 } 1430 1431 // Check if this is a string literal or constant string pointer 1432 if (arg_ty->isPointerTy()) { 1433 lldb::addr_t addr = tmp_op.ULongLong(); 1434 size_t dataSize = 0; 1435 1436 bool Success = execution_unit.GetAllocSize(addr, dataSize); 1437 (void)Success; 1438 assert(Success && 1439 "unable to locate host data for transfer to device"); 1440 // Create the required buffer 1441 rawArgs[i].size = dataSize; 1442 rawArgs[i].data_up.reset(new uint8_t[dataSize + 1]); 1443 1444 // Read string from host memory 1445 execution_unit.ReadMemory(rawArgs[i].data_up.get(), addr, dataSize, 1446 error); 1447 assert(!error.Fail() && 1448 "we have failed to read the string from memory"); 1449 1450 // Add null terminator 1451 rawArgs[i].data_up[dataSize] = '\0'; 1452 rawArgs[i].type = lldb_private::ABI::CallArgument::HostPointer; 1453 } else /* if ( arg_ty->isPointerTy() ) */ 1454 { 1455 rawArgs[i].type = lldb_private::ABI::CallArgument::TargetValue; 1456 // Get argument size in bytes 1457 rawArgs[i].size = arg_ty->getIntegerBitWidth() / 8; 1458 // Push value into argument list for thread plan 1459 rawArgs[i].value = tmp_op.ULongLong(); 1460 } 1461 } 1462 1463 // Pack the arguments into an llvm::array 1464 llvm::ArrayRef<lldb_private::ABI::CallArgument> args(rawArgs, numArgs); 1465 1466 // Setup a thread plan to call the target function 1467 lldb::ThreadPlanSP call_plan_sp( 1468 new lldb_private::ThreadPlanCallFunctionUsingABI( 1469 exe_ctx.GetThreadRef(), funcAddr, *prototype, *returnType, args, 1470 options)); 1471 1472 // Check if the plan is valid 1473 lldb_private::StreamString ss; 1474 if (!call_plan_sp || !call_plan_sp->ValidatePlan(&ss)) { 1475 error.SetErrorToGenericError(); 1476 error.SetErrorStringWithFormat( 1477 "unable to make ThreadPlanCallFunctionUsingABI for 0x%llx", 1478 I.ULongLong()); 1479 return false; 1480 } 1481 1482 exe_ctx.GetProcessPtr()->SetRunningUserExpression(true); 1483 1484 // Execute the actual function call thread plan 1485 lldb::ExpressionResults res = exe_ctx.GetProcessRef().RunThreadPlan( 1486 exe_ctx, call_plan_sp, options, diagnostics); 1487 1488 // Check that the thread plan completed successfully 1489 if (res != lldb::ExpressionResults::eExpressionCompleted) { 1490 error.SetErrorToGenericError(); 1491 error.SetErrorStringWithFormat("ThreadPlanCallFunctionUsingABI failed"); 1492 return false; 1493 } 1494 1495 exe_ctx.GetProcessPtr()->SetRunningUserExpression(false); 1496 1497 // Void return type 1498 if (returnType->isVoidTy()) { 1499 // Cant assign to void types, so we leave the frame untouched 1500 } else 1501 // Integer or pointer return type 1502 if (returnType->isIntegerTy() || returnType->isPointerTy()) { 1503 // Get the encapsulated return value 1504 lldb::ValueObjectSP retVal = call_plan_sp.get()->GetReturnValueObject(); 1505 1506 lldb_private::Scalar returnVal = -1; 1507 lldb_private::ValueObject *vobj = retVal.get(); 1508 1509 // Check if the return value is valid 1510 if (vobj == nullptr || !retVal) { 1511 error.SetErrorToGenericError(); 1512 error.SetErrorStringWithFormat("unable to get the return value"); 1513 return false; 1514 } 1515 1516 // Extract the return value as a integer 1517 lldb_private::Value &value = vobj->GetValue(); 1518 returnVal = value.GetScalar(); 1519 1520 // Push the return value as the result 1521 frame.AssignValue(inst, returnVal, module); 1522 } 1523 } break; 1524 } 1525 1526 ++frame.m_ii; 1527 } 1528 1529 if (num_insts >= 4096) { 1530 error.SetErrorToGenericError(); 1531 error.SetErrorString(infinite_loop_error); 1532 return false; 1533 } 1534 1535 return false; 1536 } 1537