| //===-- IRInterpreter.cpp -------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Expression/IRInterpreter.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/ModuleSpec.h" |
| #include "lldb/Core/ValueObject.h" |
| #include "lldb/Expression/DiagnosticManager.h" |
| #include "lldb/Expression/IRExecutionUnit.h" |
| #include "lldb/Expression/IRMemoryMap.h" |
| #include "lldb/Utility/ConstString.h" |
| #include "lldb/Utility/DataExtractor.h" |
| #include "lldb/Utility/Endian.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/Scalar.h" |
| #include "lldb/Utility/Status.h" |
| #include "lldb/Utility/StreamString.h" |
| |
| #include "lldb/Target/ABI.h" |
| #include "lldb/Target/ExecutionContext.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/ThreadPlan.h" |
| #include "lldb/Target/ThreadPlanCallFunctionUsingABI.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/LLVMContext.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/Operator.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; |
| } |
| |
| 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<const Value *, lldb::addr_t> ValueMap; |
| |
| ValueMap m_values; |
| DataLayout &m_target_data; |
| lldb_private::IRExecutionUnit &m_execution_unit; |
| const BasicBlock *m_bb; |
| const BasicBlock *m_prev_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::IRExecutionUnit &execution_unit, |
| lldb::addr_t stack_frame_bottom, |
| lldb::addr_t stack_frame_top) |
| : m_target_data(target_data), m_execution_unit(execution_unit), |
| m_bb(nullptr), m_prev_bb(nullptr) { |
| 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_prev_bb = m_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 std::string(ss.GetString()); |
| } |
| |
| bool AssignToMatchType(lldb_private::Scalar &scalar, llvm::APInt value, |
| Type *type) { |
| size_t type_size = m_target_data.getTypeStoreSize(type); |
| |
| if (type_size > 8) |
| return false; |
| |
| if (type_size != 1) |
| type_size = PowerOf2Ceil(type_size); |
| |
| scalar = value.zextOrTrunc(type_size * 8); |
| 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, value->getType()); |
| } |
| |
| 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::Status extract_error; |
| |
| m_execution_unit.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, llvm::APInt(64, 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; |
| |
| scalar.MakeUnsigned(); |
| if (!AssignToMatchType(cast_scalar, scalar.UInt128(llvm::APInt()), |
| 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::Status get_data_error; |
| |
| if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), |
| m_byte_order, get_data_error)) |
| return false; |
| |
| lldb_private::Status write_error; |
| |
| m_execution_unit.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::FunctionVal: |
| if (const Function *constant_func = dyn_cast<Function>(constant)) { |
| lldb_private::ConstString name(constant_func->getName()); |
| bool missing_weak = false; |
| lldb::addr_t addr = m_execution_unit.FindSymbol(name, missing_weak); |
| if (addr == LLDB_INVALID_ADDRESS || missing_weak) |
| return false; |
| value = APInt(m_target_data.getPointerSizeInBits(), addr); |
| return true; |
| } |
| 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); |
| |
| Type *src_elem_ty = |
| cast<GEPOperator>(constant_expr)->getSourceElementType(); |
| uint64_t offset = |
| m_target_data.getIndexedOffsetInType(src_elem_ty, 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::Status write_error; |
| |
| m_execution_unit.WritePointerToMemory(data_address, address, write_error); |
| |
| if (!write_error.Success()) { |
| lldb_private::Status free_error; |
| m_execution_unit.Free(data_address, free_error); |
| return false; |
| } |
| |
| m_values[value] = data_address; |
| |
| lldb_private::Log *log( |
| lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) { |
| LLDB_LOGF(log, "Made an allocation for argument %s", |
| PrintValue(value).c_str()); |
| LLDB_LOGF(log, " Data region : %llx", (unsigned long long)address); |
| LLDB_LOGF(log, " 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; |
| |
| size_t constant_size = m_target_data.getTypeStoreSize(constant->getType()); |
| lldb_private::DataBufferHeap buf(constant_size, 0); |
| |
| lldb_private::Status get_data_error; |
| |
| lldb_private::Scalar resolved_scalar( |
| resolved_value.zextOrTrunc(llvm::NextPowerOf2(constant_size) * 8)); |
| if (!resolved_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), |
| m_byte_order, get_data_error)) |
| return false; |
| |
| lldb_private::Status write_error; |
| |
| m_execution_unit.WriteMemory(process_address, buf.GetBytes(), |
| buf.GetByteSize(), 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 Malloc(llvm::Type *type) { |
| lldb_private::Status 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::Status read_error; |
| |
| m_execution_unit.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 std::string(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::Status free_error; |
| m_execution_unit.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_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 *too_many_functions_error = |
| "Interpreter doesn't handle modules with multiple function bodies."; |
| |
| static bool CanResolveConstant(llvm::Constant *constant) { |
| switch (constant->getValueID()) { |
| default: |
| return false; |
| case Value::ConstantIntVal: |
| case Value::ConstantFPVal: |
| case Value::FunctionVal: |
| return true; |
| 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 CanResolveConstant(constant_expr->getOperand(0)); |
| case Instruction::GetElementPtr: { |
| ConstantExpr::const_op_iterator op_cursor = constant_expr->op_begin(); |
| Constant *base = dyn_cast<Constant>(*op_cursor); |
| if (!base) |
| return false; |
| |
| return CanResolveConstant(base); |
| } |
| } |
| } else { |
| return false; |
| } |
| case Value::ConstantPointerNullVal: |
| return true; |
| } |
| } |
| |
| bool IRInterpreter::CanInterpret(llvm::Module &module, llvm::Function &function, |
| lldb_private::Status &error, |
| const bool support_function_calls) { |
| lldb_private::Log *log( |
| lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); |
| |
| bool saw_function_with_body = false; |
| for (Function &f : module) { |
| if (f.begin() != f.end()) { |
| if (saw_function_with_body) { |
| LLDB_LOGF(log, "More than one function in the module has a body"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(too_many_functions_error); |
| return false; |
| } |
| saw_function_with_body = true; |
| } |
| } |
| |
| for (BasicBlock &bb : function) { |
| for (Instruction &ii : bb) { |
| switch (ii.getOpcode()) { |
| default: { |
| LLDB_LOGF(log, "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::PHI: |
| break; |
| case Instruction::Call: { |
| CallInst *call_inst = dyn_cast<CallInst>(&ii); |
| |
| if (!call_inst) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| if (!CanIgnoreCall(call_inst) && !support_function_calls) { |
| LLDB_LOGF(log, "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<ICmpInst>(&ii); |
| |
| if (!icmp_inst) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| switch (icmp_inst->getPredicate()) { |
| default: { |
| LLDB_LOGF(log, "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 (unsigned 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::FixedVectorTyID: |
| case Type::ScalableVectorTyID: { |
| LLDB_LOGF(log, "Unsupported operand type: %s", |
| PrintType(operand_type).c_str()); |
| error.SetErrorString(unsupported_operand_error); |
| return false; |
| } |
| } |
| |
| // The IR interpreter currently doesn't know about |
| // 128-bit integers. As they're not that frequent, |
| // we can just fall back to the JIT rather than |
| // choking. |
| if (operand_type->getPrimitiveSizeInBits() > 64) { |
| LLDB_LOGF(log, "Unsupported operand type: %s", |
| PrintType(operand_type).c_str()); |
| error.SetErrorString(unsupported_operand_error); |
| return false; |
| } |
| |
| if (Constant *constant = llvm::dyn_cast<Constant>(operand)) { |
| if (!CanResolveConstant(constant)) { |
| LLDB_LOGF(log, "Unsupported constant: %s", |
| PrintValue(constant).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::IRExecutionUnit &execution_unit, |
| lldb_private::Status &error, |
| lldb::addr_t stack_frame_bottom, |
| lldb::addr_t stack_frame_top, |
| lldb_private::ExecutionContext &exe_ctx) { |
| lldb_private::Log *log( |
| lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) { |
| std::string s; |
| raw_string_ostream oss(s); |
| |
| module.print(oss, nullptr); |
| |
| oss.flush(); |
| |
| LLDB_LOGF(log, "Module as passed in to IRInterpreter::Interpret: \n\"%s\"", |
| s.c_str()); |
| } |
| |
| DataLayout data_layout(&module); |
| |
| InterpreterStackFrame frame(data_layout, execution_unit, 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<size_t>(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.front()); |
| |
| while (frame.m_ii != frame.m_ie && (++num_insts < 4096)) { |
| const Instruction *inst = &*frame.m_ii; |
| |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF( |
| log, |
| "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)) { |
| LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, module)) { |
| LLDB_LOGF(log, "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: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = L / R; |
| break; |
| case Instruction::SRem: |
| L.MakeSigned(); |
| R.MakeSigned(); |
| result = L % R; |
| break; |
| case Instruction::URem: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = L % R; |
| 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) { |
| LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); |
| LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); |
| LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); |
| LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::Alloca: { |
| const AllocaInst *alloca_inst = cast<AllocaInst>(inst); |
| |
| if (alloca_inst->isArrayAllocation()) { |
| LLDB_LOGF(log, |
| "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) { |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF(log, |
| "Couldn't allocate the result pointer for an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_allocation_error); |
| return false; |
| } |
| |
| lldb_private::Status write_error; |
| |
| execution_unit.WritePointerToMemory(P, R, write_error); |
| |
| if (!write_error.Success()) { |
| LLDB_LOGF(log, "Couldn't write the result pointer for an AllocaInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_write_error); |
| lldb_private::Status free_error; |
| execution_unit.Free(P, free_error); |
| execution_unit.Free(R, free_error); |
| return false; |
| } |
| |
| frame.m_values[alloca_inst] = P; |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted an AllocaInst"); |
| LLDB_LOGF(log, " R : 0x%" PRIx64, R); |
| LLDB_LOGF(log, " P : 0x%" PRIx64, P); |
| } |
| } break; |
| case Instruction::BitCast: |
| case Instruction::ZExt: { |
| const CastInst *cast_inst = cast<CastInst>(inst); |
| |
| Value *source = cast_inst->getOperand(0); |
| |
| lldb_private::Scalar S; |
| |
| if (!frame.EvaluateValue(S, source, module)) { |
| LLDB_LOGF(log, "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 = cast<CastInst>(inst); |
| |
| Value *source = cast_inst->getOperand(0); |
| |
| lldb_private::Scalar S; |
| |
| if (!frame.EvaluateValue(S, source, module)) { |
| LLDB_LOGF(log, "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 = cast<BranchInst>(inst); |
| |
| if (br_inst->isConditional()) { |
| Value *condition = br_inst->getCondition(); |
| |
| lldb_private::Scalar C; |
| |
| if (!frame.EvaluateValue(C, condition, module)) { |
| LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(condition).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!C.IsZero()) |
| frame.Jump(br_inst->getSuccessor(0)); |
| else |
| frame.Jump(br_inst->getSuccessor(1)); |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a BrInst with a condition"); |
| LLDB_LOGF(log, " cond : %s", |
| frame.SummarizeValue(condition).c_str()); |
| } |
| } else { |
| frame.Jump(br_inst->getSuccessor(0)); |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a BrInst with no condition"); |
| } |
| } |
| } |
| continue; |
| case Instruction::PHI: { |
| const PHINode *phi_inst = cast<PHINode>(inst); |
| if (!frame.m_prev_bb) { |
| LLDB_LOGF(log, |
| "Encountered PHI node without having jumped from another " |
| "basic block"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *value = phi_inst->getIncomingValueForBlock(frame.m_prev_bb); |
| lldb_private::Scalar result; |
| if (!frame.EvaluateValue(result, value, module)) { |
| LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(value).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| frame.AssignValue(inst, result, module); |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a %s", inst->getOpcodeName()); |
| LLDB_LOGF(log, " Incoming value : %s", |
| frame.SummarizeValue(value).c_str()); |
| } |
| } break; |
| case Instruction::GetElementPtr: { |
| const GetElementPtrInst *gep_inst = cast<GetElementPtrInst>(inst); |
| |
| const Value *pointer_operand = gep_inst->getPointerOperand(); |
| Type *src_elem_ty = gep_inst->getSourceElementType(); |
| |
| lldb_private::Scalar P; |
| |
| if (!frame.EvaluateValue(P, pointer_operand, module)) { |
| LLDB_LOGF(log, "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)) { |
| LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(*ii).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| LLDB_LOGF(log, "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.getIndexedOffsetInType(src_elem_ty, const_indices); |
| |
| lldb_private::Scalar Poffset = P + offset; |
| |
| frame.AssignValue(inst, Poffset, module); |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a GetElementPtrInst"); |
| LLDB_LOGF(log, " P : %s", |
| frame.SummarizeValue(pointer_operand).c_str()); |
| LLDB_LOGF(log, " Poffset : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::ICmp: { |
| const ICmpInst *icmp_inst = cast<ICmpInst>(inst); |
| |
| 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)) { |
| LLDB_LOGF(log, "Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, module)) { |
| LLDB_LOGF(log, "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: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = (L > R); |
| break; |
| case CmpInst::ICMP_UGE: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = (L >= R); |
| break; |
| case CmpInst::ICMP_ULT: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = (L < R); |
| break; |
| case CmpInst::ICMP_ULE: |
| L.MakeUnsigned(); |
| R.MakeUnsigned(); |
| result = (L <= R); |
| 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) { |
| LLDB_LOGF(log, "Interpreted an ICmpInst"); |
| LLDB_LOGF(log, " L : %s", frame.SummarizeValue(lhs).c_str()); |
| LLDB_LOGF(log, " R : %s", frame.SummarizeValue(rhs).c_str()); |
| LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::IntToPtr: { |
| const IntToPtrInst *int_to_ptr_inst = cast<IntToPtrInst>(inst); |
| |
| Value *src_operand = int_to_ptr_inst->getOperand(0); |
| |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, src_operand, module)) { |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF(log, "Interpreted an IntToPtr"); |
| LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); |
| LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::PtrToInt: { |
| const PtrToIntInst *ptr_to_int_inst = cast<PtrToIntInst>(inst); |
| |
| Value *src_operand = ptr_to_int_inst->getOperand(0); |
| |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, src_operand, module)) { |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF(log, "Interpreted a PtrToInt"); |
| LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); |
| LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::Trunc: { |
| const TruncInst *trunc_inst = cast<TruncInst>(inst); |
| |
| Value *src_operand = trunc_inst->getOperand(0); |
| |
| lldb_private::Scalar I; |
| |
| if (!frame.EvaluateValue(I, src_operand, module)) { |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF(log, "Interpreted a Trunc"); |
| LLDB_LOGF(log, " Src : %s", frame.SummarizeValue(src_operand).c_str()); |
| LLDB_LOGF(log, " = : %s", frame.SummarizeValue(inst).c_str()); |
| } |
| } break; |
| case Instruction::Load: { |
| const LoadInst *load_inst = cast<LoadInst>(inst); |
| |
| // 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) { |
| LLDB_LOGF(log, "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) { |
| LLDB_LOGF(log, "LoadInst's value doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P == LLDB_INVALID_ADDRESS) { |
| LLDB_LOGF(log, "LoadInst's pointer doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb::addr_t R; |
| lldb_private::Status read_error; |
| execution_unit.ReadPointerFromMemory(&R, P, read_error); |
| |
| if (!read_error.Success()) { |
| LLDB_LOGF(log, "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(); |
| execution_unit.ReadMemory(buffer.GetBytes(), R, buffer.GetByteSize(), |
| read_error); |
| if (!read_error.Success()) { |
| LLDB_LOGF(log, "Couldn't read from a region on behalf of a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| lldb_private::Status write_error; |
| execution_unit.WriteMemory(D, buffer.GetBytes(), buffer.GetByteSize(), |
| write_error); |
| if (!write_error.Success()) { |
| LLDB_LOGF(log, "Couldn't write to a region on behalf of a LoadInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a LoadInst"); |
| LLDB_LOGF(log, " P : 0x%" PRIx64, P); |
| LLDB_LOGF(log, " R : 0x%" PRIx64, R); |
| LLDB_LOGF(log, " D : 0x%" PRIx64, D); |
| } |
| } break; |
| case Instruction::Ret: { |
| return true; |
| } |
| case Instruction::Store: { |
| const StoreInst *store_inst = cast<StoreInst>(inst); |
| |
| // 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) { |
| LLDB_LOGF(log, "StoreInst's value doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P == LLDB_INVALID_ADDRESS) { |
| LLDB_LOGF(log, "StoreInst's pointer doesn't resolve to anything"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| lldb::addr_t R; |
| lldb_private::Status read_error; |
| execution_unit.ReadPointerFromMemory(&R, P, read_error); |
| |
| if (!read_error.Success()) { |
| LLDB_LOGF(log, "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(); |
| execution_unit.ReadMemory(buffer.GetBytes(), D, buffer.GetByteSize(), |
| read_error); |
| if (!read_error.Success()) { |
| LLDB_LOGF(log, "Couldn't read from a region on behalf of a StoreInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_read_error); |
| return false; |
| } |
| |
| lldb_private::Status write_error; |
| execution_unit.WriteMemory(R, buffer.GetBytes(), buffer.GetByteSize(), |
| write_error); |
| if (!write_error.Success()) { |
| LLDB_LOGF(log, "Couldn't write to a region on behalf of a StoreInst"); |
| error.SetErrorToGenericError(); |
| error.SetErrorString(memory_write_error); |
| return false; |
| } |
| |
| if (log) { |
| LLDB_LOGF(log, "Interpreted a StoreInst"); |
| LLDB_LOGF(log, " D : 0x%" PRIx64, D); |
| LLDB_LOGF(log, " P : 0x%" PRIx64, P); |
| LLDB_LOGF(log, " R : 0x%" PRIx64, R); |
| } |
| } break; |
| case Instruction::Call: { |
| const CallInst *call_inst = cast<CallInst>(inst); |
| |
| if (CanIgnoreCall(call_inst)) |
| break; |
| |
| // Get the return type |
| llvm::Type *returnType = call_inst->getType(); |
| if (returnType == nullptr) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("unable to access return type"); |
| return false; |
| } |
| |
| // Work with void, integer and pointer return types |
| if (!returnType->isVoidTy() && !returnType->isIntegerTy() && |
| !returnType->isPointerTy()) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("return type is not supported"); |
| return false; |
| } |
| |
| // Check we can actually get a thread |
| if (exe_ctx.GetThreadPtr() == nullptr) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("unable to acquire thread"); |
| return false; |
| } |
| |
| // Make sure we have a valid process |
| if (!exe_ctx.GetProcessPtr()) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("unable to get the process"); |
| return false; |
| } |
| |
| // Find the address of the callee function |
| lldb_private::Scalar I; |
| const llvm::Value *val = call_inst->getCalledOperand(); |
| |
| if (!frame.EvaluateValue(I, val, module)) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("unable to get address of function"); |
| return false; |
| } |
| lldb_private::Address funcAddr(I.ULongLong(LLDB_INVALID_ADDRESS)); |
| |
| lldb_private::DiagnosticManager diagnostics; |
| lldb_private::EvaluateExpressionOptions options; |
| |
| // We generally receive a function pointer which we must dereference |
| llvm::Type *prototype = val->getType(); |
| if (!prototype->isPointerTy()) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("call need function pointer"); |
| return false; |
| } |
| |
| // Dereference the function pointer |
| prototype = prototype->getPointerElementType(); |
| if (!(prototype->isFunctionTy() || prototype->isFunctionVarArg())) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("call need function pointer"); |
| return false; |
| } |
| |
| // Find number of arguments |
| const int numArgs = call_inst->getNumArgOperands(); |
| |
| // We work with a fixed array of 16 arguments which is our upper limit |
| static lldb_private::ABI::CallArgument rawArgs[16]; |
| if (numArgs >= 16) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("function takes too many arguments"); |
| return false; |
| } |
| |
| // Push all function arguments to the argument list that will be passed |
| // to the call function thread plan |
| for (int i = 0; i < numArgs; i++) { |
| // Get details of this argument |
| llvm::Value *arg_op = call_inst->getArgOperand(i); |
| llvm::Type *arg_ty = arg_op->getType(); |
| |
| // Ensure that this argument is an supported type |
| if (!arg_ty->isIntegerTy() && !arg_ty->isPointerTy()) { |
| error.SetErrorToGenericError(); |
| error.SetErrorStringWithFormat("argument %d must be integer type", i); |
| return false; |
| } |
| |
| // Extract the arguments value |
| lldb_private::Scalar tmp_op = 0; |
| if (!frame.EvaluateValue(tmp_op, arg_op, module)) { |
| error.SetErrorToGenericError(); |
| error.SetErrorStringWithFormat("unable to evaluate argument %d", i); |
| return false; |
| } |
| |
| // Check if this is a string literal or constant string pointer |
| if (arg_ty->isPointerTy()) { |
| lldb::addr_t addr = tmp_op.ULongLong(); |
| size_t dataSize = 0; |
| |
| bool Success = execution_unit.GetAllocSize(addr, dataSize); |
| (void)Success; |
| assert(Success && |
| "unable to locate host data for transfer to device"); |
| // Create the required buffer |
| rawArgs[i].size = dataSize; |
| rawArgs[i].data_up.reset(new uint8_t[dataSize + 1]); |
| |
| // Read string from host memory |
| execution_unit.ReadMemory(rawArgs[i].data_up.get(), addr, dataSize, |
| error); |
| assert(!error.Fail() && |
| "we have failed to read the string from memory"); |
| |
| // Add null terminator |
| rawArgs[i].data_up[dataSize] = '\0'; |
| rawArgs[i].type = lldb_private::ABI::CallArgument::HostPointer; |
| } else /* if ( arg_ty->isPointerTy() ) */ |
| { |
| rawArgs[i].type = lldb_private::ABI::CallArgument::TargetValue; |
| // Get argument size in bytes |
| rawArgs[i].size = arg_ty->getIntegerBitWidth() / 8; |
| // Push value into argument list for thread plan |
| rawArgs[i].value = tmp_op.ULongLong(); |
| } |
| } |
| |
| // Pack the arguments into an llvm::array |
| llvm::ArrayRef<lldb_private::ABI::CallArgument> args(rawArgs, numArgs); |
| |
| // Setup a thread plan to call the target function |
| lldb::ThreadPlanSP call_plan_sp( |
| new lldb_private::ThreadPlanCallFunctionUsingABI( |
| exe_ctx.GetThreadRef(), funcAddr, *prototype, *returnType, args, |
| options)); |
| |
| // Check if the plan is valid |
| lldb_private::StreamString ss; |
| if (!call_plan_sp || !call_plan_sp->ValidatePlan(&ss)) { |
| error.SetErrorToGenericError(); |
| error.SetErrorStringWithFormat( |
| "unable to make ThreadPlanCallFunctionUsingABI for 0x%llx", |
| I.ULongLong()); |
| return false; |
| } |
| |
| exe_ctx.GetProcessPtr()->SetRunningUserExpression(true); |
| |
| // Execute the actual function call thread plan |
| lldb::ExpressionResults res = exe_ctx.GetProcessRef().RunThreadPlan( |
| exe_ctx, call_plan_sp, options, diagnostics); |
| |
| // Check that the thread plan completed successfully |
| if (res != lldb::ExpressionResults::eExpressionCompleted) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("ThreadPlanCallFunctionUsingABI failed"); |
| return false; |
| } |
| |
| exe_ctx.GetProcessPtr()->SetRunningUserExpression(false); |
| |
| // Void return type |
| if (returnType->isVoidTy()) { |
| // Cant assign to void types, so we leave the frame untouched |
| } else |
| // Integer or pointer return type |
| if (returnType->isIntegerTy() || returnType->isPointerTy()) { |
| // Get the encapsulated return value |
| lldb::ValueObjectSP retVal = call_plan_sp.get()->GetReturnValueObject(); |
| |
| lldb_private::Scalar returnVal = -1; |
| lldb_private::ValueObject *vobj = retVal.get(); |
| |
| // Check if the return value is valid |
| if (vobj == nullptr || !retVal) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("unable to get the return value"); |
| return false; |
| } |
| |
| // Extract the return value as a integer |
| lldb_private::Value &value = vobj->GetValue(); |
| returnVal = value.GetScalar(); |
| |
| // Push the return value as the result |
| frame.AssignValue(inst, returnVal, module); |
| } |
| } break; |
| } |
| |
| ++frame.m_ii; |
| } |
| |
| if (num_insts >= 4096) { |
| error.SetErrorToGenericError(); |
| error.SetErrorString(infinite_loop_error); |
| return false; |
| } |
| |
| return false; |
| } |
