//===-- 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 "lldb/Host/Endian.h" #include "llvm/IR/Constants.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/Function.h" #include "llvm/IR/Instructions.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/Module.h" #include "llvm/Support/raw_ostream.h" #include 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; } static bool CanIgnoreCall (const CallInst *call) { const llvm::Function *called_function = call->getCalledFunction(); if (!called_function) return false; if (called_function->isIntrinsic()) { switch (called_function->getIntrinsicID()) { default: break; case llvm::Intrinsic::dbg_declare: case llvm::Intrinsic::dbg_value: return true; } } return false; } class InterpreterStackFrame { public: typedef std::map 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(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 == 1 || value_size == 2 || value_size == 4 || 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(constant)) { value = constant_int->getValue(); return true; } break; case Value::ConstantFPVal: if (const ConstantFP *constant_fp = dyn_cast(constant)) { value = constant_fp->getValueAPF().bitcastToAPInt(); return true; } break; case Value::ConstantExprVal: if (const ConstantExpr *constant_expr = dyn_cast(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(*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 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(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; lldb_private::StreamString buffer (lldb_private::Stream::eBinary, m_memory_map.GetAddressByteSize(), m_memory_map.GetByteOrder()); size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); const uint64_t *raw_data = resolved_value.getRawData(); buffer.PutRawBytes(raw_data, constant_size, lldb::endian::InlHostByteOrder()); lldb_private::Error write_error; m_memory_map.WriteMemory(process_address, (const uint8_t*)buffer.GetData(), 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(""); 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(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)); bool saw_function_with_body = false; for (Module::iterator fi = module.begin(), fe = module.end(); fi != fe; ++fi) { if (fi->begin() != fi->end()) { if (saw_function_with_body) return false; saw_function_with_body = true; } } 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: break; case Instruction::Call: { CallInst *call_inst = dyn_cast(ii); if (!call_inst) { error.SetErrorToGenericError(); error.SetErrorString(interpreter_internal_error); return false; } if (!CanIgnoreCall(call_inst)) { if (log) log->Printf("Unsupported instruction: %s", PrintValue(ii).c_str()); error.SetErrorToGenericError(); error.SetErrorString(unsupported_opcode_error); return false; } } break; case Instruction::GetElementPtr: break; case Instruction::ICmp: { ICmpInst *icmp_inst = dyn_cast(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::Trunc: 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 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() < static_cast(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::Call: { const CallInst *call_inst = dyn_cast(inst); if (!call_inst) { if (log) log->Printf("getOpcode() returns %s, but instruction is not a CallInst", inst->getOpcodeName()); error.SetErrorToGenericError(); error.SetErrorString(interpreter_internal_error); return false; } if (!CanIgnoreCall(call_inst)) { if (log) log->Printf("The interpreter shouldn't have accepted %s", PrintValue(call_inst).c_str()); error.SetErrorToGenericError(); error.SetErrorString(interpreter_internal_error); return false; } } 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(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(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(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(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(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(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 IndexVector; typedef IndexVector::iterator IndexIterator; SmallVector indices (gep_inst->idx_begin(), gep_inst->idx_end()); SmallVector const_indices; for (IndexIterator ii = indices.begin(), ie = indices.end(); ii != ie; ++ii) { ConstantInt *constant_index = dyn_cast(*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::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(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(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(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::Trunc: { const TruncInst *trunc_inst = dyn_cast(inst); if (!trunc_inst) { if (log) log->Printf("getOpcode() returns Trunc, but instruction is not a TruncInst"); error.SetErrorToGenericError(); error.SetErrorString(interpreter_internal_error); return false; } Value *src_operand = trunc_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 Trunc"); 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(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(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(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(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; }