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 using lldb_private::LLDBLog; 45 46 static std::string PrintValue(const Value *value, bool truncate = false) { 47 std::string s; 48 raw_string_ostream rso(s); 49 value->print(rso); 50 rso.flush(); 51 if (truncate) 52 s.resize(s.length() - 1); 53 54 size_t offset; 55 while ((offset = s.find('\n')) != s.npos) 56 s.erase(offset, 1); 57 while (s[0] == ' ' || s[0] == '\t') 58 s.erase(0, 1); 59 60 return s; 61 } 62 63 static std::string PrintType(const Type *type, bool truncate = false) { 64 std::string s; 65 raw_string_ostream rso(s); 66 type->print(rso); 67 rso.flush(); 68 if (truncate) 69 s.resize(s.length() - 1); 70 return s; 71 } 72 73 static bool CanIgnoreCall(const CallInst *call) { 74 const llvm::Function *called_function = call->getCalledFunction(); 75 76 if (!called_function) 77 return false; 78 79 if (called_function->isIntrinsic()) { 80 switch (called_function->getIntrinsicID()) { 81 default: 82 break; 83 case llvm::Intrinsic::dbg_declare: 84 case llvm::Intrinsic::dbg_value: 85 return true; 86 } 87 } 88 89 return false; 90 } 91 92 class InterpreterStackFrame { 93 public: 94 typedef std::map<const Value *, lldb::addr_t> ValueMap; 95 96 ValueMap m_values; 97 DataLayout &m_target_data; 98 lldb_private::IRExecutionUnit &m_execution_unit; 99 const BasicBlock *m_bb; 100 const BasicBlock *m_prev_bb; 101 BasicBlock::const_iterator m_ii; 102 BasicBlock::const_iterator m_ie; 103 104 lldb::addr_t m_frame_process_address; 105 size_t m_frame_size; 106 lldb::addr_t m_stack_pointer; 107 108 lldb::ByteOrder m_byte_order; 109 size_t m_addr_byte_size; 110 111 InterpreterStackFrame(DataLayout &target_data, 112 lldb_private::IRExecutionUnit &execution_unit, 113 lldb::addr_t stack_frame_bottom, 114 lldb::addr_t stack_frame_top) 115 : m_target_data(target_data), m_execution_unit(execution_unit), 116 m_bb(nullptr), m_prev_bb(nullptr) { 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); 287 288 Type *src_elem_ty = 289 cast<GEPOperator>(constant_expr)->getSourceElementType(); 290 uint64_t offset = 291 m_target_data.getIndexedOffsetInType(src_elem_ty, indices); 292 293 const bool is_signed = true; 294 value += APInt(value.getBitWidth(), offset, is_signed); 295 296 return true; 297 } 298 } 299 } 300 break; 301 case Value::ConstantPointerNullVal: 302 if (isa<ConstantPointerNull>(constant)) { 303 value = APInt(m_target_data.getPointerSizeInBits(), 0); 304 return true; 305 } 306 break; 307 } 308 return false; 309 } 310 311 bool MakeArgument(const Argument *value, uint64_t address) { 312 lldb::addr_t data_address = Malloc(value->getType()); 313 314 if (data_address == LLDB_INVALID_ADDRESS) 315 return false; 316 317 lldb_private::Status write_error; 318 319 m_execution_unit.WritePointerToMemory(data_address, address, write_error); 320 321 if (!write_error.Success()) { 322 lldb_private::Status free_error; 323 m_execution_unit.Free(data_address, free_error); 324 return false; 325 } 326 327 m_values[value] = data_address; 328 329 lldb_private::Log *log(GetLog(LLDBLog::Expressions)); 330 331 if (log) { 332 LLDB_LOGF(log, "Made an allocation for argument %s", 333 PrintValue(value).c_str()); 334 LLDB_LOGF(log, " Data region : %llx", (unsigned long long)address); 335 LLDB_LOGF(log, " Ref region : %llx", 336 (unsigned long long)data_address); 337 } 338 339 return true; 340 } 341 342 bool ResolveConstant(lldb::addr_t process_address, const Constant *constant) { 343 APInt resolved_value; 344 345 if (!ResolveConstantValue(resolved_value, constant)) 346 return false; 347 348 size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); 349 lldb_private::DataBufferHeap buf(constant_size, 0); 350 351 lldb_private::Status get_data_error; 352 353 lldb_private::Scalar resolved_scalar( 354 resolved_value.zextOrTrunc(llvm::NextPowerOf2(constant_size) * 8)); 355 if (!resolved_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), 356 m_byte_order, get_data_error)) 357 return false; 358 359 lldb_private::Status write_error; 360 361 m_execution_unit.WriteMemory(process_address, buf.GetBytes(), 362 buf.GetByteSize(), write_error); 363 364 return write_error.Success(); 365 } 366 367 lldb::addr_t Malloc(size_t size, uint8_t byte_alignment) { 368 lldb::addr_t ret = m_stack_pointer; 369 370 ret -= size; 371 ret -= (ret % byte_alignment); 372 373 if (ret < m_frame_process_address) 374 return LLDB_INVALID_ADDRESS; 375 376 m_stack_pointer = ret; 377 return ret; 378 } 379 380 lldb::addr_t Malloc(llvm::Type *type) { 381 lldb_private::Status alloc_error; 382 383 return Malloc(m_target_data.getTypeAllocSize(type), 384 m_target_data.getPrefTypeAlignment(type)); 385 } 386 387 std::string PrintData(lldb::addr_t addr, llvm::Type *type) { 388 size_t length = m_target_data.getTypeStoreSize(type); 389 390 lldb_private::DataBufferHeap buf(length, 0); 391 392 lldb_private::Status read_error; 393 394 m_execution_unit.ReadMemory(buf.GetBytes(), addr, length, read_error); 395 396 if (!read_error.Success()) 397 return std::string("<couldn't read data>"); 398 399 lldb_private::StreamString ss; 400 401 for (size_t i = 0; i < length; i++) { 402 if ((!(i & 0xf)) && i) 403 ss.Printf("%02hhx - ", buf.GetBytes()[i]); 404 else 405 ss.Printf("%02hhx ", buf.GetBytes()[i]); 406 } 407 408 return std::string(ss.GetString()); 409 } 410 411 lldb::addr_t ResolveValue(const Value *value, Module &module) { 412 ValueMap::iterator i = m_values.find(value); 413 414 if (i != m_values.end()) 415 return i->second; 416 417 // Fall back and allocate space [allocation type Alloca] 418 419 lldb::addr_t data_address = Malloc(value->getType()); 420 421 if (const Constant *constant = dyn_cast<Constant>(value)) { 422 if (!ResolveConstant(data_address, constant)) { 423 lldb_private::Status free_error; 424 m_execution_unit.Free(data_address, free_error); 425 return LLDB_INVALID_ADDRESS; 426 } 427 } 428 429 m_values[value] = data_address; 430 return data_address; 431 } 432 }; 433 434 static const char *unsupported_opcode_error = 435 "Interpreter doesn't handle one of the expression's opcodes"; 436 static const char *unsupported_operand_error = 437 "Interpreter doesn't handle one of the expression's operands"; 438 static const char *interpreter_internal_error = 439 "Interpreter encountered an internal error"; 440 static const char *bad_value_error = 441 "Interpreter couldn't resolve a value during execution"; 442 static const char *memory_allocation_error = 443 "Interpreter couldn't allocate memory"; 444 static const char *memory_write_error = "Interpreter couldn't write to memory"; 445 static const char *memory_read_error = "Interpreter couldn't read from memory"; 446 static const char *infinite_loop_error = "Interpreter ran for too many cycles"; 447 static const char *too_many_functions_error = 448 "Interpreter doesn't handle modules with multiple function bodies."; 449 450 static bool CanResolveConstant(llvm::Constant *constant) { 451 switch (constant->getValueID()) { 452 default: 453 return false; 454 case Value::ConstantIntVal: 455 case Value::ConstantFPVal: 456 case Value::FunctionVal: 457 return true; 458 case Value::ConstantExprVal: 459 if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) { 460 switch (constant_expr->getOpcode()) { 461 default: 462 return false; 463 case Instruction::IntToPtr: 464 case Instruction::PtrToInt: 465 case Instruction::BitCast: 466 return CanResolveConstant(constant_expr->getOperand(0)); 467 case Instruction::GetElementPtr: { 468 ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); 469 Constant *base = dyn_cast<Constant>(*op_cursor); 470 if (!base) 471 return false; 472 473 return CanResolveConstant(base); 474 } 475 } 476 } else { 477 return false; 478 } 479 case Value::ConstantPointerNullVal: 480 return true; 481 } 482 } 483 484 bool IRInterpreter::CanInterpret(llvm::Module &module, llvm::Function &function, 485 lldb_private::Status &error, 486 const bool support_function_calls) { 487 lldb_private::Log *log(GetLog(LLDBLog::Expressions)); 488 489 bool saw_function_with_body = false; 490 for (Function &f : module) { 491 if (f.begin() != f.end()) { 492 if (saw_function_with_body) { 493 LLDB_LOGF(log, "More than one function in the module has a body"); 494 error.SetErrorToGenericError(); 495 error.SetErrorString(too_many_functions_error); 496 return false; 497 } 498 saw_function_with_body = true; 499 } 500 } 501 502 for (BasicBlock &bb : function) { 503 for (Instruction &ii : bb) { 504 switch (ii.getOpcode()) { 505 default: { 506 LLDB_LOGF(log, "Unsupported instruction: %s", PrintValue(&ii).c_str()); 507 error.SetErrorToGenericError(); 508 error.SetErrorString(unsupported_opcode_error); 509 return false; 510 } 511 case Instruction::Add: 512 case Instruction::Alloca: 513 case Instruction::BitCast: 514 case Instruction::Br: 515 case Instruction::PHI: 516 break; 517 case Instruction::Call: { 518 CallInst *call_inst = dyn_cast<CallInst>(&ii); 519 520 if (!call_inst) { 521 error.SetErrorToGenericError(); 522 error.SetErrorString(interpreter_internal_error); 523 return false; 524 } 525 526 if (!CanIgnoreCall(call_inst) && !support_function_calls) { 527 LLDB_LOGF(log, "Unsupported instruction: %s", 528 PrintValue(&ii).c_str()); 529 error.SetErrorToGenericError(); 530 error.SetErrorString(unsupported_opcode_error); 531 return false; 532 } 533 } break; 534 case Instruction::GetElementPtr: 535 break; 536 case Instruction::ICmp: { 537 ICmpInst *icmp_inst = dyn_cast<ICmpInst>(&ii); 538 539 if (!icmp_inst) { 540 error.SetErrorToGenericError(); 541 error.SetErrorString(interpreter_internal_error); 542 return false; 543 } 544 545 switch (icmp_inst->getPredicate()) { 546 default: { 547 LLDB_LOGF(log, "Unsupported ICmp predicate: %s", 548 PrintValue(&ii).c_str()); 549 550 error.SetErrorToGenericError(); 551 error.SetErrorString(unsupported_opcode_error); 552 return false; 553 } 554 case CmpInst::ICMP_EQ: 555 case CmpInst::ICMP_NE: 556 case CmpInst::ICMP_UGT: 557 case CmpInst::ICMP_UGE: 558 case CmpInst::ICMP_ULT: 559 case CmpInst::ICMP_ULE: 560 case CmpInst::ICMP_SGT: 561 case CmpInst::ICMP_SGE: 562 case CmpInst::ICMP_SLT: 563 case CmpInst::ICMP_SLE: 564 break; 565 } 566 } break; 567 case Instruction::And: 568 case Instruction::AShr: 569 case Instruction::IntToPtr: 570 case Instruction::PtrToInt: 571 case Instruction::Load: 572 case Instruction::LShr: 573 case Instruction::Mul: 574 case Instruction::Or: 575 case Instruction::Ret: 576 case Instruction::SDiv: 577 case Instruction::SExt: 578 case Instruction::Shl: 579 case Instruction::SRem: 580 case Instruction::Store: 581 case Instruction::Sub: 582 case Instruction::Trunc: 583 case Instruction::UDiv: 584 case Instruction::URem: 585 case Instruction::Xor: 586 case Instruction::ZExt: 587 break; 588 } 589 590 for (unsigned oi = 0, oe = ii.getNumOperands(); oi != oe; ++oi) { 591 Value *operand = ii.getOperand(oi); 592 Type *operand_type = operand->getType(); 593 594 switch (operand_type->getTypeID()) { 595 default: 596 break; 597 case Type::FixedVectorTyID: 598 case Type::ScalableVectorTyID: { 599 LLDB_LOGF(log, "Unsupported operand type: %s", 600 PrintType(operand_type).c_str()); 601 error.SetErrorString(unsupported_operand_error); 602 return false; 603 } 604 } 605 606 // The IR interpreter currently doesn't know about 607 // 128-bit integers. As they're not that frequent, 608 // we can just fall back to the JIT rather than 609 // choking. 610 if (operand_type->getPrimitiveSizeInBits() > 64) { 611 LLDB_LOGF(log, "Unsupported operand type: %s", 612 PrintType(operand_type).c_str()); 613 error.SetErrorString(unsupported_operand_error); 614 return false; 615 } 616 617 if (Constant *constant = llvm::dyn_cast<Constant>(operand)) { 618 if (!CanResolveConstant(constant)) { 619 LLDB_LOGF(log, "Unsupported constant: %s", 620 PrintValue(constant).c_str()); 621 error.SetErrorString(unsupported_operand_error); 622 return false; 623 } 624 } 625 } 626 } 627 } 628 629 return true; 630 } 631 632 bool IRInterpreter::Interpret(llvm::Module &module, llvm::Function &function, 633 llvm::ArrayRef<lldb::addr_t> args, 634 lldb_private::IRExecutionUnit &execution_unit, 635 lldb_private::Status &error, 636 lldb::addr_t stack_frame_bottom, 637 lldb::addr_t stack_frame_top, 638 lldb_private::ExecutionContext &exe_ctx) { 639 lldb_private::Log *log(GetLog(LLDBLog::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_write_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.SetErrorString("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.SetErrorString("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->arg_size(); 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.SetErrorString("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.SetErrorString("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.SetErrorString("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