| //===-- IRInterpreter.cpp ---------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Core/DataExtractor.h" |
| #include "lldb/Core/Error.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/Scalar.h" |
| #include "lldb/Core/StreamString.h" |
| #include "lldb/Expression/IRMemoryMap.h" |
| #include "lldb/Expression/IRInterpreter.h" |
| |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/DataLayout.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/Instructions.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| #include <map> |
| |
| using namespace llvm; |
| |
| static std::string |
| PrintValue(const Value *value, bool truncate = false) |
| { |
| std::string s; |
| raw_string_ostream rso(s); |
| value->print(rso); |
| rso.flush(); |
| if (truncate) |
| s.resize(s.length() - 1); |
| |
| size_t offset; |
| while ((offset = s.find('\n')) != s.npos) |
| s.erase(offset, 1); |
| while (s[0] == ' ' || s[0] == '\t') |
| s.erase(0, 1); |
| |
| return s; |
| } |
| |
| static std::string |
| PrintType(const Type *type, bool truncate = false) |
| { |
| std::string s; |
| raw_string_ostream rso(s); |
| type->print(rso); |
| rso.flush(); |
| if (truncate) |
| s.resize(s.length() - 1); |
| return s; |
| } |
| |
| class InterpreterStackFrame |
| { |
| public: |
| typedef std::map <const Value*, lldb::addr_t> ValueMap; |
| |
| ValueMap m_values; |
| DataLayout &m_target_data; |
| lldb_private::IRMemoryMap &m_memory_map; |
| const BasicBlock *m_bb; |
| BasicBlock::const_iterator m_ii; |
| BasicBlock::const_iterator m_ie; |
| |
| lldb::addr_t m_frame_process_address; |
| size_t m_frame_size; |
| lldb::addr_t m_stack_pointer; |
| |
| lldb::ByteOrder m_byte_order; |
| size_t m_addr_byte_size; |
| |
| InterpreterStackFrame (DataLayout &target_data, |
| lldb_private::IRMemoryMap &memory_map, |
| lldb::addr_t stack_frame_bottom, |
| lldb::addr_t stack_frame_top) : |
| m_target_data (target_data), |
| m_memory_map (memory_map) |
| { |
| m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig); |
| m_addr_byte_size = (target_data.getPointerSize(0)); |
| |
| m_frame_process_address = stack_frame_bottom; |
| m_frame_size = stack_frame_top - stack_frame_bottom; |
| m_stack_pointer = stack_frame_top; |
| } |
| |
| ~InterpreterStackFrame () |
| { |
| } |
| |
| void Jump (const BasicBlock *bb) |
| { |
| m_bb = bb; |
| m_ii = m_bb->begin(); |
| m_ie = m_bb->end(); |
| } |
| |
| std::string SummarizeValue (const Value *value) |
| { |
| lldb_private::StreamString ss; |
| |
| ss.Printf("%s", PrintValue(value).c_str()); |
| |
| ValueMap::iterator i = m_values.find(value); |
| |
| if (i != m_values.end()) |
| { |
| lldb::addr_t addr = i->second; |
| |
| ss.Printf(" 0x%llx", (unsigned long long)addr); |
| } |
| |
| return ss.GetString(); |
| } |
| |
| bool AssignToMatchType (lldb_private::Scalar &scalar, uint64_t u64value, Type *type) |
| { |
| size_t type_size = m_target_data.getTypeStoreSize(type); |
| |
| switch (type_size) |
| { |
| case 1: |
| scalar = (uint8_t)u64value; |
| break; |
| case 2: |
| scalar = (uint16_t)u64value; |
| break; |
| case 4: |
| scalar = (uint32_t)u64value; |
| break; |
| case 8: |
| scalar = (uint64_t)u64value; |
| break; |
| default: |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool EvaluateValue (lldb_private::Scalar &scalar, const Value *value, Module &module) |
| { |
| const Constant *constant = dyn_cast<Constant>(value); |
| |
| if (constant) |
| { |
| APInt value_apint; |
| |
| if (!ResolveConstantValue(value_apint, constant)) |
| return false; |
| |
| return AssignToMatchType(scalar, value_apint.getLimitedValue(), value->getType()); |
| } |
| else |
| { |
| lldb::addr_t process_address = ResolveValue(value, module); |
| size_t value_size = m_target_data.getTypeStoreSize(value->getType()); |
| |
| lldb_private::DataExtractor value_extractor; |
| lldb_private::Error extract_error; |
| |
| m_memory_map.GetMemoryData(value_extractor, process_address, value_size, extract_error); |
| |
| if (!extract_error.Success()) |
| return false; |
| |
| lldb::offset_t offset = 0; |
| if (value_size <= 8) |
| { |
| uint64_t u64value = value_extractor.GetMaxU64(&offset, value_size); |
| return AssignToMatchType(scalar, u64value, value->getType()); |
| } |
| } |
| |
| return false; |
| } |
| |
| bool AssignValue (const Value *value, lldb_private::Scalar &scalar, Module &module) |
| { |
| lldb::addr_t process_address = ResolveValue (value, module); |
| |
| if (process_address == LLDB_INVALID_ADDRESS) |
| return false; |
| |
| lldb_private::Scalar cast_scalar; |
| |
| if (!AssignToMatchType(cast_scalar, scalar.GetRawBits64(0), value->getType())) |
| return false; |
| |
| size_t value_byte_size = m_target_data.getTypeStoreSize(value->getType()); |
| |
| lldb_private::DataBufferHeap buf(value_byte_size, 0); |
| |
| lldb_private::Error get_data_error; |
| |
| if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), m_byte_order, get_data_error)) |
| return false; |
| |
| lldb_private::Error write_error; |
| |
| m_memory_map.WriteMemory(process_address, buf.GetBytes(), buf.GetByteSize(), write_error); |
| |
| return write_error.Success(); |
| } |
| |
| bool ResolveConstantValue (APInt &value, const Constant *constant) |
| { |
| switch (constant->getValueID()) |
| { |
| default: |
| break; |
| case Value::ConstantIntVal: |
| if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) |
| { |
| value = constant_int->getValue(); |
| return true; |
| } |
| break; |
| case Value::ConstantFPVal: |
| if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) |
| { |
| value = constant_fp->getValueAPF().bitcastToAPInt(); |
| return true; |
| } |
| break; |
| case Value::ConstantExprVal: |
| if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) |
| { |
| switch (constant_expr->getOpcode()) |
| { |
| default: |
| return false; |
| case Instruction::IntToPtr: |
| case Instruction::PtrToInt: |
| case Instruction::BitCast: |
| return ResolveConstantValue(value, constant_expr->getOperand(0)); |
| case Instruction::GetElementPtr: |
| { |
| ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); |
| ConstantExpr::const_op_iterator op_end = constant_expr->op_end(); |
| |
| Constant *base = dyn_cast<Constant>(*op_cursor); |
| |
| if (!base) |
| return false; |
| |
| if (!ResolveConstantValue(value, base)) |
| return false; |
| |
| op_cursor++; |
| |
| if (op_cursor == op_end) |
| return true; // no offset to apply! |
| |
| SmallVector <Value *, 8> indices (op_cursor, op_end); |
| |
| uint64_t offset = m_target_data.getIndexedOffset(base->getType(), indices); |
| |
| const bool is_signed = true; |
| value += APInt(value.getBitWidth(), offset, is_signed); |
| |
| return true; |
| } |
| } |
| } |
| break; |
| case Value::ConstantPointerNullVal: |
| if (isa<ConstantPointerNull>(constant)) |
| { |
| value = APInt(m_target_data.getPointerSizeInBits(), 0); |
| return true; |
| } |
| break; |
| } |
| return false; |
| } |
| |
| bool MakeArgument(const Argument *value, uint64_t address) |
| { |
| lldb::addr_t data_address = Malloc(value->getType()); |
| |
| if (data_address == LLDB_INVALID_ADDRESS) |
| return false; |
| |
| lldb_private::Error write_error; |
| |
| m_memory_map.WritePointerToMemory(data_address, address, write_error); |
| |
| if (!write_error.Success()) |
| { |
| lldb_private::Error free_error; |
| m_memory_map.Free(data_address, free_error); |
| return false; |
| } |
| |
| m_values[value] = data_address; |
| |
| lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) |
| { |
| log->Printf("Made an allocation for argument %s", PrintValue(value).c_str()); |
| log->Printf(" Data region : %llx", (unsigned long long)address); |
| log->Printf(" Ref region : %llx", (unsigned long long)data_address); |
| } |
| |
| return true; |
| } |
| |
| bool ResolveConstant (lldb::addr_t process_address, const Constant *constant) |
| { |
| APInt resolved_value; |
| |
| if (!ResolveConstantValue(resolved_value, constant)) |
| return false; |
| |
| const uint64_t *raw_data = resolved_value.getRawData(); |
| |
| size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); |
| |
| lldb_private::Error write_error; |
| |
| m_memory_map.WriteMemory(process_address, (uint8_t*)raw_data, constant_size, write_error); |
| |
| return write_error.Success(); |
| } |
| |
| lldb::addr_t Malloc (size_t size, uint8_t byte_alignment) |
| { |
| lldb::addr_t ret = m_stack_pointer; |
| |
| ret -= size; |
| ret -= (ret % byte_alignment); |
| |
| if (ret < m_frame_process_address) |
| return LLDB_INVALID_ADDRESS; |
| |
| m_stack_pointer = ret; |
| return ret; |
| } |
| |
| lldb::addr_t MallocPointer () |
| { |
| return Malloc(m_target_data.getPointerSize(), m_target_data.getPointerPrefAlignment()); |
| } |
| |
| lldb::addr_t Malloc (llvm::Type *type) |
| { |
| lldb_private::Error alloc_error; |
| |
| return Malloc(m_target_data.getTypeAllocSize(type), m_target_data.getPrefTypeAlignment(type)); |
| } |
| |
| std::string PrintData (lldb::addr_t addr, llvm::Type *type) |
| { |
| size_t length = m_target_data.getTypeStoreSize(type); |
| |
| lldb_private::DataBufferHeap buf(length, 0); |
| |
| lldb_private::Error read_error; |
| |
| m_memory_map.ReadMemory(buf.GetBytes(), addr, length, read_error); |
| |
| if (!read_error.Success()) |
| return std::string("<couldn't read data>"); |
| |
| lldb_private::StreamString ss; |
| |
| for (size_t i = 0; i < length; i++) |
| { |
| if ((!(i & 0xf)) && i) |
| ss.Printf("%02hhx - ", buf.GetBytes()[i]); |
| else |
| ss.Printf("%02hhx ", buf.GetBytes()[i]); |
| } |
| |
| return ss.GetString(); |
| } |
| |
| lldb::addr_t ResolveValue (const Value *value, Module &module) |
| { |
| ValueMap::iterator i = m_values.find(value); |
| |
| if (i != m_values.end()) |
| return i->second; |
| |
| // Fall back and allocate space [allocation type Alloca] |
| |
| lldb::addr_t data_address = Malloc(value->getType()); |
| |
| if (const Constant *constant = dyn_cast<Constant>(value)) |
| { |
| if (!ResolveConstant (data_address, constant)) |
| { |
| lldb_private::Error free_error; |
| m_memory_map.Free(data_address, free_error); |
| return LLDB_INVALID_ADDRESS; |
| } |
| } |
| |
| m_values[value] = data_address; |
| return data_address; |
| } |
| }; |
| |
| static const char *unsupported_opcode_error = "Interpreter doesn't handle one of the expression's opcodes"; |
| static const char *unsupported_operand_error = "Interpreter doesn't handle one of the expression's operands"; |
| //static const char *interpreter_initialization_error = "Interpreter couldn't be initialized"; |
| static const char *interpreter_internal_error = "Interpreter encountered an internal error"; |
| static const char *bad_value_error = "Interpreter couldn't resolve a value during execution"; |
| static const char *memory_allocation_error = "Interpreter couldn't allocate memory"; |
| static const char *memory_write_error = "Interpreter couldn't write to memory"; |
| static const char *memory_read_error = "Interpreter couldn't read from memory"; |
| static const char *infinite_loop_error = "Interpreter ran for too many cycles"; |
| //static const char *bad_result_error = "Result of expression is in bad memory"; |
| |
| bool |
| IRInterpreter::CanInterpret (llvm::Module &module, |
| llvm::Function &function, |
| lldb_private::Error &error) |
| { |
| lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| for (Function::iterator bbi = function.begin(), bbe = function.end(); |
| bbi != bbe; |
| ++bbi) |
| { |
| for (BasicBlock::iterator ii = bbi->begin(), ie = bbi->end(); |
| ii != ie; |
| ++ii) |
| { |
| switch (ii->getOpcode()) |
| { |
| default: |
| { |
| if (log) |
| log->Printf("Unsupported instruction: %s", PrintValue(ii).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(unsupported_opcode_error); |
| return false; |
| } |
| case Instruction::Add: |
| case Instruction::Alloca: |
| case Instruction::BitCast: |
| case Instruction::Br: |
| case Instruction::GetElementPtr: |
| break; |
| case Instruction::ICmp: |
| { |
| ICmpInst *icmp_inst = dyn_cast<ICmpInst>(ii); |
| |
| if (!icmp_inst) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| switch (icmp_inst->getPredicate()) |
| { |
| default: |
| { |
| if (log) |
| log->Printf("Unsupported ICmp predicate: %s", PrintValue(ii).c_str()); |
| |
| error.SetErrorToGenericError(); |
| error.SetErrorString(unsupported_opcode_error); |
| return false; |
| } |
| case CmpInst::ICMP_EQ: |
| case CmpInst::ICMP_NE: |
| case CmpInst::ICMP_UGT: |
| case CmpInst::ICMP_UGE: |
| case CmpInst::ICMP_ULT: |
| case CmpInst::ICMP_ULE: |
| case CmpInst::ICMP_SGT: |
| case CmpInst::ICMP_SGE: |
| case CmpInst::ICMP_SLT: |
| case CmpInst::ICMP_SLE: |
| break; |
| } |
| } |
| break; |
| case Instruction::And: |
| case Instruction::AShr: |
| case Instruction::IntToPtr: |
| case Instruction::PtrToInt: |
| case Instruction::Load: |
| case Instruction::LShr: |
| case Instruction::Mul: |
| case Instruction::Or: |
| case Instruction::Ret: |
| case Instruction::SDiv: |
| case Instruction::SExt: |
| case Instruction::Shl: |
| case Instruction::SRem: |
| case Instruction::Store: |
| case Instruction::Sub: |
| case Instruction::UDiv: |
| case Instruction::URem: |
| case Instruction::Xor: |
| case Instruction::ZExt: |
| break; |
| } |
| |
| for (int oi = 0, oe = ii->getNumOperands(); |
| oi != oe; |
| ++oi) |
| { |
| Value *operand = ii->getOperand(oi); |
| Type *operand_type = operand->getType(); |
| |
| switch (operand_type->getTypeID()) |
| { |
| default: |
| break; |
| case Type::VectorTyID: |
| { |
| if (log) |
| log->Printf("Unsupported operand type: %s", PrintType(operand_type).c_str()); |
| error.SetErrorString(unsupported_operand_error); |
| return false; |
| } |
| } |
| } |
| } |
| |
| } |
| |
| return true;} |
| |
| bool |
| IRInterpreter::Interpret (llvm::Module &module, |
| llvm::Function &function, |
| llvm::ArrayRef<lldb::addr_t> args, |
| lldb_private::IRMemoryMap &memory_map, |
| lldb_private::Error &error, |
| lldb::addr_t stack_frame_bottom, |
| lldb::addr_t stack_frame_top) |
| { |
| lldb_private::Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) |
| { |
| std::string s; |
| raw_string_ostream oss(s); |
| |
| module.print(oss, NULL); |
| |
| oss.flush(); |
| |
| log->Printf("Module as passed in to IRInterpreter::Interpret: \n\"%s\"", s.c_str()); |
| } |
| |
| DataLayout data_layout(&module); |
| |
| InterpreterStackFrame frame(data_layout, memory_map, stack_frame_bottom, stack_frame_top); |
| |
| if (frame.m_frame_process_address == LLDB_INVALID_ADDRESS) |
| { |
| error.SetErrorString("Couldn't allocate stack frame"); |
| } |
| |
| int arg_index = 0; |
| |
| for (llvm::Function::arg_iterator ai = function.arg_begin(), ae = function.arg_end(); |
| ai != ae; |
| ++ai, ++arg_index) |
| { |
| if (args.size() < arg_index) |
| { |
| error.SetErrorString ("Not enough arguments passed in to function"); |
| return false; |
| } |
| |
| lldb::addr_t ptr = args[arg_index]; |
| |
| frame.MakeArgument(ai, ptr); |
| } |
| |
| uint32_t num_insts = 0; |
| |
| frame.Jump(function.begin()); |
| |
| while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) |
| { |
| const Instruction *inst = frame.m_ii; |
| |
| if (log) |
| log->Printf("Interpreting %s", PrintValue(inst).c_str()); |
| |
| switch (inst->getOpcode()) |
| { |
| default: |
| break; |
| case Instruction::Add: |
| case Instruction::Sub: |
| case Instruction::Mul: |
| case Instruction::SDiv: |
| case Instruction::UDiv: |
| case Instruction::SRem: |
| case Instruction::URem: |
| case Instruction::Shl: |
| case Instruction::LShr: |
| case Instruction::AShr: |
| case Instruction::And: |
| case Instruction::Or: |
| case Instruction::Xor: |
| { |
| const BinaryOperator *bin_op = dyn_cast<BinaryOperator>(inst); |
| |
| if (!bin_op) |
| { |
| if (log) |
| log->Printf("getOpcode() returns %s, but instruction is not a BinaryOperator", inst->getOpcodeName()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *lhs = inst->getOperand(0); |
| Value *rhs = inst->getOperand(1); |
| |
| lldb_private::Scalar L; |
| lldb_private::Scalar R; |
| |
| if (!frame.EvaluateValue(L, lhs, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb_private::Scalar result; |
| |
| switch (inst->getOpcode()) |
| { |
| default: |
| break; |
| case Instruction::Add: |
| result = L + R; |
| break; |
| case Instruction::Mul: |
| result = L * R; |
| break; |
| case Instruction::Sub: |
| result = L - R; |
| break; |
| case Instruction::SDiv: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = L / R; |
| break; |
| case Instruction::UDiv: |
| result = L.GetRawBits64(0) / R.GetRawBits64(1); |
| break; |
| case Instruction::SRem: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = L % R; |
| break; |
| case Instruction::URem: |
| result = L.GetRawBits64(0) % R.GetRawBits64(1); |
| break; |
| case Instruction::Shl: |
| result = L << R; |
| break; |
| case Instruction::AShr: |
| result = L >> R; |
| break; |
| case Instruction::LShr: |
| result = L; |
| result.ShiftRightLogical(R); |
| break; |
| case Instruction::And: |
| result = L & R; |
| break; |
| case Instruction::Or: |
| result = L | R; |
| break; |
| case Instruction::Xor: |
| result = L ^ R; |
| break; |
| } |
| |
| frame.AssignValue(inst, result, module); |
| |
| if (log) |
| { |
| log->Printf("Interpreted a %s", inst->getOpcodeName()); |
| log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str()); |
| log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str()); |
| log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::Alloca: |
| { |
| const AllocaInst *alloca_inst = dyn_cast<AllocaInst>(inst); |
| |
| if (!alloca_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns Alloca, but instruction is not an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| if (alloca_inst->isArrayAllocation()) |
| { |
| if (log) |
| log->Printf("AllocaInsts are not handled if isArrayAllocation() is true"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(unsupported_opcode_error); |
| return false; |
| } |
| |
| // The semantics of Alloca are: |
| // Create a region R of virtual memory of type T, backed by a data buffer |
| // Create a region P of virtual memory of type T*, backed by a data buffer |
| // Write the virtual address of R into P |
| |
| Type *T = alloca_inst->getAllocatedType(); |
| Type *Tptr = alloca_inst->getType(); |
| |
| lldb::addr_t R = frame.Malloc(T); |
| |
| if (R == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("Couldn't allocate memory for an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_allocation_error); |
| return false; |
| } |
| |
| lldb::addr_t P = frame.Malloc(Tptr); |
| |
| if (P == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("Couldn't allocate the result pointer for an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_allocation_error); |
| return false; |
| } |
| |
| lldb_private::Error write_error; |
| |
| memory_map.WritePointerToMemory(P, R, write_error); |
| |
| if (!write_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't write the result pointer for an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_write_error); |
| lldb_private::Error free_error; |
| memory_map.Free(P, free_error); |
| memory_map.Free(R, free_error); |
| return false; |
| } |
| |
| frame.m_values[alloca_inst] = P; |
| |
| if (log) |
| { |
| log->Printf("Interpreted an AllocaInst"); |
| log->Printf(" R : 0x%" PRIx64, R); |
| log->Printf(" P : 0x%" PRIx64, P); |
| } |
| } |
| break; |
| case Instruction::BitCast: |
| case Instruction::ZExt: |
| { |
| const CastInst *cast_inst = dyn_cast<CastInst>(inst); |
| |
| if (!cast_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *source = cast_inst->getOperand(0); |
| |
| lldb_private::Scalar S; |
| |
| if (!frame.EvaluateValue(S, source, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(source).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| frame.AssignValue(inst, S, module); |
| } |
| break; |
| case Instruction::SExt: |
| { |
| const CastInst *cast_inst = dyn_cast<CastInst>(inst); |
| |
| if (!cast_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns %s, but instruction is not a BitCastInst", cast_inst->getOpcodeName()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *source = cast_inst->getOperand(0); |
| |
| lldb_private::Scalar S; |
| |
| if (!frame.EvaluateValue(S, source, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(source).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| S.MakeSigned(); |
| |
| lldb_private::Scalar S_signextend(S.SLongLong()); |
| |
| frame.AssignValue(inst, S_signextend, module); |
| } |
| break; |
| case Instruction::Br: |
| { |
| const BranchInst *br_inst = dyn_cast<BranchInst>(inst); |
| |
| if (!br_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns Br, but instruction is not a BranchInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| if (br_inst->isConditional()) |
| { |
| Value *condition = br_inst->getCondition(); |
| |
| lldb_private::Scalar C; |
| |
| if (!frame.EvaluateValue(C, condition, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(condition).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (C.GetRawBits64(0)) |
| frame.Jump(br_inst->getSuccessor(0)); |
| else |
| frame.Jump(br_inst->getSuccessor(1)); |
| |
| if (log) |
| { |
| log->Printf("Interpreted a BrInst with a condition"); |
| log->Printf(" cond : %s", frame.SummarizeValue(condition).c_str()); |
| } |
| } |
| else |
| { |
| frame.Jump(br_inst->getSuccessor(0)); |
| |
| if (log) |
| { |
| log->Printf("Interpreted a BrInst with no condition"); |
| } |
| } |
| } |
| continue; |
| case Instruction::GetElementPtr: |
| { |
| const GetElementPtrInst *gep_inst = dyn_cast<GetElementPtrInst>(inst); |
| |
| if (!gep_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns GetElementPtr, but instruction is not a GetElementPtrInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| const Value *pointer_operand = gep_inst->getPointerOperand(); |
| Type *pointer_type = pointer_operand->getType(); |
| |
| lldb_private::Scalar P; |
| |
| if (!frame.EvaluateValue(P, pointer_operand, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(pointer_operand).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| typedef SmallVector <Value *, 8> IndexVector; |
| typedef IndexVector::iterator IndexIterator; |
| |
| SmallVector <Value *, 8> indices (gep_inst->idx_begin(), |
| gep_inst->idx_end()); |
| |
| SmallVector <Value *, 8> const_indices; |
| |
| for (IndexIterator ii = indices.begin(), ie = indices.end(); |
| ii != ie; |
| ++ii) |
| { |
| ConstantInt *constant_index = dyn_cast<ConstantInt>(*ii); |
| |
| if (!constant_index) |
| { |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, *ii, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (log) |
| log->Printf("Evaluated constant index %s as %llu", PrintValue(*ii).c_str(), I.ULongLong(LLDB_INVALID_ADDRESS)); |
| |
| constant_index = cast<ConstantInt>(ConstantInt::get((*ii)->getType(), I.ULongLong(LLDB_INVALID_ADDRESS))); |
| } |
| |
| const_indices.push_back(constant_index); |
| } |
| |
| uint64_t offset = data_layout.getIndexedOffset(pointer_type, const_indices); |
| |
| lldb_private::Scalar Poffset = P + offset; |
| |
| frame.AssignValue(inst, Poffset, module); |
| |
| if (log) |
| { |
| log->Printf("Interpreted a GetElementPtrInst"); |
| log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); |
| log->Printf(" Poffset : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::ICmp: |
| { |
| const ICmpInst *icmp_inst = dyn_cast<ICmpInst>(inst); |
| |
| if (!icmp_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns ICmp, but instruction is not an ICmpInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| CmpInst::Predicate predicate = icmp_inst->getPredicate(); |
| |
| Value *lhs = inst->getOperand(0); |
| Value *rhs = inst->getOperand(1); |
| |
| lldb_private::Scalar L; |
| lldb_private::Scalar R; |
| |
| if (!frame.EvaluateValue(L, lhs, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb_private::Scalar result; |
| |
| switch (predicate) |
| { |
| default: |
| return false; |
| case CmpInst::ICMP_EQ: |
| result = (L == R); |
| break; |
| case CmpInst::ICMP_NE: |
| result = (L != R); |
| break; |
| case CmpInst::ICMP_UGT: |
| result = (L.GetRawBits64(0) > R.GetRawBits64(0)); |
| break; |
| case CmpInst::ICMP_UGE: |
| result = (L.GetRawBits64(0) >= R.GetRawBits64(0)); |
| break; |
| case CmpInst::ICMP_ULT: |
| result = (L.GetRawBits64(0) < R.GetRawBits64(0)); |
| break; |
| case CmpInst::ICMP_ULE: |
| result = (L.GetRawBits64(0) <= R.GetRawBits64(0)); |
| break; |
| case CmpInst::ICMP_SGT: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = (L > R); |
| break; |
| case CmpInst::ICMP_SGE: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = (L >= R); |
| break; |
| case CmpInst::ICMP_SLT: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = (L < R); |
| break; |
| case CmpInst::ICMP_SLE: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = (L <= R); |
| break; |
| } |
| |
| frame.AssignValue(inst, result, module); |
| |
| if (log) |
| { |
| log->Printf("Interpreted an ICmpInst"); |
| log->Printf(" L : %s", frame.SummarizeValue(lhs).c_str()); |
| log->Printf(" R : %s", frame.SummarizeValue(rhs).c_str()); |
| log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::IntToPtr: |
| { |
| const IntToPtrInst *int_to_ptr_inst = dyn_cast<IntToPtrInst>(inst); |
| |
| if (!int_to_ptr_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns IntToPtr, but instruction is not an IntToPtrInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *src_operand = int_to_ptr_inst->getOperand(0); |
| |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, src_operand, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| frame.AssignValue(inst, I, module); |
| |
| if (log) |
| { |
| log->Printf("Interpreted an IntToPtr"); |
| log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str()); |
| log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::PtrToInt: |
| { |
| const PtrToIntInst *ptr_to_int_inst = dyn_cast<PtrToIntInst>(inst); |
| |
| if (!ptr_to_int_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns PtrToInt, but instruction is not an PtrToIntInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *src_operand = ptr_to_int_inst->getOperand(0); |
| |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, src_operand, module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| frame.AssignValue(inst, I, module); |
| |
| if (log) |
| { |
| log->Printf("Interpreted a PtrToInt"); |
| log->Printf(" Src : %s", frame.SummarizeValue(src_operand).c_str()); |
| log->Printf(" = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::Load: |
| { |
| const LoadInst *load_inst = dyn_cast<LoadInst>(inst); |
| |
| if (!load_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns Load, but instruction is not a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| // The semantics of Load are: |
| // Create a region D that will contain the loaded data |
| // Resolve the region P containing a pointer |
| // Dereference P to get the region R that the data should be loaded from |
| // Transfer a unit of type type(D) from R to D |
| |
| const Value *pointer_operand = load_inst->getPointerOperand(); |
| |
| Type *pointer_ty = pointer_operand->getType(); |
| PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); |
| if (!pointer_ptr_ty) |
| { |
| if (log) |
| log->Printf("getPointerOperand()->getType() is not a PointerType"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| Type *target_ty = pointer_ptr_ty->getElementType(); |
| |
| lldb::addr_t D = frame.ResolveValue(load_inst, module); |
| lldb::addr_t P = frame.ResolveValue(pointer_operand, module); |
| |
| if (D == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("LoadInst's value doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("LoadInst's pointer doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb::addr_t R; |
| lldb_private::Error read_error; |
| memory_map.ReadPointerFromMemory(&R, P, read_error); |
| |
| if (!read_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't read the address to be loaded for a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| size_t target_size = data_layout.getTypeStoreSize(target_ty); |
| lldb_private::DataBufferHeap buffer(target_size, 0); |
| |
| read_error.Clear(); |
| memory_map.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), read_error); |
| if (!read_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't read from a region on behalf of a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| lldb_private::Error write_error; |
| memory_map.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), write_error); |
| if (!write_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't write to a region on behalf of a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| if (log) |
| { |
| log->Printf("Interpreted a LoadInst"); |
| log->Printf(" P : 0x%" PRIx64, P); |
| log->Printf(" R : 0x%" PRIx64, R); |
| log->Printf(" D : 0x%" PRIx64, D); |
| } |
| } |
| break; |
| case Instruction::Ret: |
| { |
| return true; |
| } |
| case Instruction::Store: |
| { |
| const StoreInst *store_inst = dyn_cast<StoreInst>(inst); |
| |
| if (!store_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns Store, but instruction is not a StoreInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| // The semantics of Store are: |
| // Resolve the region D containing the data to be stored |
| // Resolve the region P containing a pointer |
| // Dereference P to get the region R that the data should be stored in |
| // Transfer a unit of type type(D) from D to R |
| |
| const Value *value_operand = store_inst->getValueOperand(); |
| const Value *pointer_operand = store_inst->getPointerOperand(); |
| |
| Type *pointer_ty = pointer_operand->getType(); |
| PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); |
| if (!pointer_ptr_ty) |
| return false; |
| Type *target_ty = pointer_ptr_ty->getElementType(); |
| |
| lldb::addr_t D = frame.ResolveValue(value_operand, module); |
| lldb::addr_t P = frame.ResolveValue(pointer_operand, module); |
| |
| if (D == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("StoreInst's value doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P == LLDB_INVALID_ADDRESS) |
| { |
| if (log) |
| log->Printf("StoreInst's pointer doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb::addr_t R; |
| lldb_private::Error read_error; |
| memory_map.ReadPointerFromMemory(&R, P, read_error); |
| |
| if (!read_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't read the address to be loaded for a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| size_t target_size = data_layout.getTypeStoreSize(target_ty); |
| lldb_private::DataBufferHeap buffer(target_size, 0); |
| |
| read_error.Clear(); |
| memory_map.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), read_error); |
| if (!read_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't read from a region on behalf of a StoreInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| lldb_private::Error write_error; |
| memory_map.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), write_error); |
| if (!write_error.Success()) |
| { |
| if (log) |
| log->Printf("Couldn't write to a region on behalf of a StoreInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_write_error); |
| return false; |
| } |
| |
| if (log) |
| { |
| log->Printf("Interpreted a StoreInst"); |
| log->Printf(" D : 0x%" PRIx64, D); |
| log->Printf(" P : 0x%" PRIx64, P); |
| log->Printf(" R : 0x%" PRIx64, R); |
| } |
| } |
| break; |
| } |
| |
| ++frame.m_ii; |
| } |
| |
| if (num_insts >= 4096) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString(infinite_loop_error); |
| return false; |
| } |
| |
| return false; |
| } |
