| //===-- 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/DataEncoder.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/ValueObjectConstResult.h" |
| #include "lldb/Expression/ClangExpressionDeclMap.h" |
| #include "lldb/Expression/ClangExpressionVariable.h" |
| #include "lldb/Expression/IRForTarget.h" |
| #include "lldb/Expression/IRInterpreter.h" |
| |
| #include "llvm/Constants.h" |
| #include "llvm/Function.h" |
| #include "llvm/Instructions.h" |
| #include "llvm/Module.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/Target/TargetData.h" |
| |
| #include <map> |
| |
| using namespace llvm; |
| |
| IRInterpreter::IRInterpreter(lldb_private::ClangExpressionDeclMap &decl_map, |
| lldb_private::Stream *error_stream) : |
| m_decl_map(decl_map), |
| m_error_stream(error_stream) |
| { |
| |
| } |
| |
| IRInterpreter::~IRInterpreter() |
| { |
| |
| } |
| |
| 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; |
| } |
| |
| typedef STD_SHARED_PTR(lldb_private::DataEncoder) DataEncoderSP; |
| typedef STD_SHARED_PTR(lldb_private::DataExtractor) DataExtractorSP; |
| |
| class Memory |
| { |
| public: |
| typedef uint32_t index_t; |
| |
| struct Allocation |
| { |
| // m_virtual_address is always the address of the variable in the virtual memory |
| // space provided by Memory. |
| // |
| // m_origin is always non-NULL and describes the source of the data (possibly |
| // m_data if this allocation is the authoritative source). |
| // |
| // Possible value configurations: |
| // |
| // Allocation type getValueType() getContextType() m_origin->GetScalar() m_data |
| // ========================================================================================================================= |
| // FileAddress eValueTypeFileAddress eContextTypeInvalid A location in a binary NULL |
| // image |
| // |
| // LoadAddress eValueTypeLoadAddress eContextTypeInvalid A location in the target's NULL |
| // virtual memory |
| // |
| // Alloca eValueTypeHostAddress eContextTypeInvalid == m_data->GetBytes() Deleted at end of |
| // execution |
| // |
| // PersistentVar eValueTypeHostAddress eContextTypeClangType A persistent variable's NULL |
| // location in LLDB's memory |
| // |
| // Register [ignored] eContextTypeRegister [ignored] Flushed to the register |
| // at the end of execution |
| |
| lldb::addr_t m_virtual_address; |
| size_t m_extent; |
| lldb_private::Value m_origin; |
| lldb::DataBufferSP m_data; |
| |
| Allocation (lldb::addr_t virtual_address, |
| size_t extent, |
| lldb::DataBufferSP data) : |
| m_virtual_address(virtual_address), |
| m_extent(extent), |
| m_data(data) |
| { |
| } |
| |
| Allocation (const Allocation &allocation) : |
| m_virtual_address(allocation.m_virtual_address), |
| m_extent(allocation.m_extent), |
| m_origin(allocation.m_origin), |
| m_data(allocation.m_data) |
| { |
| } |
| }; |
| |
| typedef STD_SHARED_PTR(Allocation) AllocationSP; |
| |
| struct Region |
| { |
| AllocationSP m_allocation; |
| uint64_t m_base; |
| uint64_t m_extent; |
| |
| Region () : |
| m_allocation(), |
| m_base(0), |
| m_extent(0) |
| { |
| } |
| |
| Region (AllocationSP allocation, uint64_t base, uint64_t extent) : |
| m_allocation(allocation), |
| m_base(base), |
| m_extent(extent) |
| { |
| } |
| |
| Region (const Region ®ion) : |
| m_allocation(region.m_allocation), |
| m_base(region.m_base), |
| m_extent(region.m_extent) |
| { |
| } |
| |
| bool IsValid () |
| { |
| return m_allocation != NULL; |
| } |
| |
| bool IsInvalid () |
| { |
| return m_allocation == NULL; |
| } |
| }; |
| |
| typedef std::vector <AllocationSP> MemoryMap; |
| |
| private: |
| lldb::addr_t m_addr_base; |
| lldb::addr_t m_addr_max; |
| MemoryMap m_memory; |
| lldb::ByteOrder m_byte_order; |
| lldb::addr_t m_addr_byte_size; |
| TargetData &m_target_data; |
| |
| lldb_private::ClangExpressionDeclMap &m_decl_map; |
| |
| MemoryMap::iterator LookupInternal (lldb::addr_t addr) |
| { |
| for (MemoryMap::iterator i = m_memory.begin(), e = m_memory.end(); |
| i != e; |
| ++i) |
| { |
| if ((*i)->m_virtual_address <= addr && |
| (*i)->m_virtual_address + (*i)->m_extent > addr) |
| return i; |
| } |
| |
| return m_memory.end(); |
| } |
| |
| public: |
| Memory (TargetData &target_data, |
| lldb_private::ClangExpressionDeclMap &decl_map, |
| lldb::addr_t alloc_start, |
| lldb::addr_t alloc_max) : |
| m_addr_base(alloc_start), |
| m_addr_max(alloc_max), |
| m_target_data(target_data), |
| m_decl_map(decl_map) |
| { |
| m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig); |
| m_addr_byte_size = (target_data.getPointerSize()); |
| } |
| |
| Region Malloc (size_t size, size_t align) |
| { |
| lldb::DataBufferSP data(new lldb_private::DataBufferHeap(size, 0)); |
| |
| if (data) |
| { |
| index_t index = m_memory.size(); |
| |
| const size_t mask = (align - 1); |
| |
| m_addr_base += mask; |
| m_addr_base &= ~mask; |
| |
| if (m_addr_base + size < m_addr_base || |
| m_addr_base + size > m_addr_max) |
| return Region(); |
| |
| uint64_t base = m_addr_base; |
| |
| m_memory.push_back(AllocationSP(new Allocation(base, size, data))); |
| |
| m_addr_base += size; |
| |
| AllocationSP alloc = m_memory[index]; |
| |
| alloc->m_origin.GetScalar() = (unsigned long long)data->GetBytes(); |
| alloc->m_origin.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); |
| alloc->m_origin.SetValueType(lldb_private::Value::eValueTypeHostAddress); |
| |
| return Region(alloc, base, size); |
| } |
| |
| return Region(); |
| } |
| |
| Region Malloc (Type *type) |
| { |
| return Malloc (m_target_data.getTypeAllocSize(type), |
| m_target_data.getPrefTypeAlignment(type)); |
| } |
| |
| Region Place (Type *type, lldb::addr_t base, lldb_private::Value &value) |
| { |
| index_t index = m_memory.size(); |
| size_t size = m_target_data.getTypeAllocSize(type); |
| |
| m_memory.push_back(AllocationSP(new Allocation(base, size, lldb::DataBufferSP()))); |
| |
| AllocationSP alloc = m_memory[index]; |
| |
| alloc->m_origin = value; |
| |
| return Region(alloc, base, size); |
| } |
| |
| void Free (lldb::addr_t addr) |
| { |
| MemoryMap::iterator i = LookupInternal (addr); |
| |
| if (i != m_memory.end()) |
| m_memory.erase(i); |
| } |
| |
| Region Lookup (lldb::addr_t addr, Type *type) |
| { |
| MemoryMap::iterator i = LookupInternal(addr); |
| |
| if (i == m_memory.end() || !type->isSized()) |
| return Region(); |
| |
| size_t size = m_target_data.getTypeStoreSize(type); |
| |
| return Region(*i, addr, size); |
| } |
| |
| DataEncoderSP GetEncoder (Region region) |
| { |
| if (region.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress) |
| return DataEncoderSP(); |
| |
| lldb::DataBufferSP buffer = region.m_allocation->m_data; |
| |
| if (!buffer) |
| return DataEncoderSP(); |
| |
| size_t base_offset = (size_t)(region.m_base - region.m_allocation->m_virtual_address); |
| |
| return DataEncoderSP(new lldb_private::DataEncoder(buffer->GetBytes() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); |
| } |
| |
| DataExtractorSP GetExtractor (Region region) |
| { |
| if (region.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress) |
| return DataExtractorSP(); |
| |
| lldb::DataBufferSP buffer = region.m_allocation->m_data; |
| size_t base_offset = (size_t)(region.m_base - region.m_allocation->m_virtual_address); |
| |
| if (buffer) |
| return DataExtractorSP(new lldb_private::DataExtractor(buffer->GetBytes() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); |
| else |
| return DataExtractorSP(new lldb_private::DataExtractor((uint8_t*)region.m_allocation->m_origin.GetScalar().ULongLong() + base_offset, region.m_extent, m_byte_order, m_addr_byte_size)); |
| } |
| |
| lldb_private::Value GetAccessTarget(lldb::addr_t addr) |
| { |
| MemoryMap::iterator i = LookupInternal(addr); |
| |
| if (i == m_memory.end()) |
| return lldb_private::Value(); |
| |
| lldb_private::Value target = (*i)->m_origin; |
| |
| if (target.GetContextType() == lldb_private::Value::eContextTypeRegisterInfo) |
| { |
| target.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); |
| target.SetValueType(lldb_private::Value::eValueTypeHostAddress); |
| target.GetScalar() = (unsigned long long)(*i)->m_data->GetBytes(); |
| } |
| |
| target.GetScalar() += (addr - (*i)->m_virtual_address); |
| |
| return target; |
| } |
| |
| bool Write (lldb::addr_t addr, const uint8_t *data, size_t length) |
| { |
| lldb_private::Value target = GetAccessTarget(addr); |
| |
| return m_decl_map.WriteTarget(target, data, length); |
| } |
| |
| bool Read (uint8_t *data, lldb::addr_t addr, size_t length) |
| { |
| lldb_private::Value source = GetAccessTarget(addr); |
| |
| return m_decl_map.ReadTarget(data, source, length); |
| } |
| |
| bool WriteToRawPtr (lldb::addr_t addr, const uint8_t *data, size_t length) |
| { |
| lldb_private::Value target = m_decl_map.WrapBareAddress(addr); |
| |
| return m_decl_map.WriteTarget(target, data, length); |
| } |
| |
| bool ReadFromRawPtr (uint8_t *data, lldb::addr_t addr, size_t length) |
| { |
| lldb_private::Value source = m_decl_map.WrapBareAddress(addr); |
| |
| return m_decl_map.ReadTarget(data, source, length); |
| } |
| |
| std::string PrintData (lldb::addr_t addr, size_t length) |
| { |
| lldb_private::Value target = GetAccessTarget(addr); |
| |
| lldb_private::DataBufferHeap buf(length, 0); |
| |
| if (!m_decl_map.ReadTarget(buf.GetBytes(), target, length)) |
| 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(); |
| } |
| |
| std::string SummarizeRegion (Region ®ion) |
| { |
| lldb_private::StreamString ss; |
| |
| lldb_private::Value base = GetAccessTarget(region.m_base); |
| |
| ss.Printf("%llx [%s - %s %llx]", |
| region.m_base, |
| lldb_private::Value::GetValueTypeAsCString(base.GetValueType()), |
| lldb_private::Value::GetContextTypeAsCString(base.GetContextType()), |
| base.GetScalar().ULongLong()); |
| |
| ss.Printf(" %s", PrintData(region.m_base, region.m_extent).c_str()); |
| |
| return ss.GetString(); |
| } |
| }; |
| |
| class InterpreterStackFrame |
| { |
| public: |
| typedef std::map <const Value*, Memory::Region> ValueMap; |
| |
| ValueMap m_values; |
| Memory &m_memory; |
| TargetData &m_target_data; |
| lldb_private::ClangExpressionDeclMap &m_decl_map; |
| const BasicBlock *m_bb; |
| BasicBlock::const_iterator m_ii; |
| BasicBlock::const_iterator m_ie; |
| |
| lldb::ByteOrder m_byte_order; |
| size_t m_addr_byte_size; |
| |
| InterpreterStackFrame (TargetData &target_data, |
| Memory &memory, |
| lldb_private::ClangExpressionDeclMap &decl_map) : |
| m_memory (memory), |
| m_target_data (target_data), |
| m_decl_map (decl_map) |
| { |
| m_byte_order = (target_data.isLittleEndian() ? lldb::eByteOrderLittle : lldb::eByteOrderBig); |
| m_addr_byte_size = (target_data.getPointerSize()); |
| } |
| |
| void Jump (const BasicBlock *bb) |
| { |
| m_bb = bb; |
| m_ii = m_bb->begin(); |
| m_ie = m_bb->end(); |
| } |
| |
| bool Cache (Memory::AllocationSP allocation, Type *type) |
| { |
| if (allocation->m_origin.GetContextType() != lldb_private::Value::eContextTypeRegisterInfo) |
| return false; |
| |
| return m_decl_map.ReadTarget(allocation->m_data->GetBytes(), allocation->m_origin, allocation->m_data->GetByteSize()); |
| } |
| |
| 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()) |
| { |
| Memory::Region region = i->second; |
| |
| ss.Printf(" %s", m_memory.SummarizeRegion(region).c_str()); |
| } |
| |
| 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) |
| { |
| if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) |
| { |
| return AssignToMatchType(scalar, constant_int->getLimitedValue(), value->getType()); |
| } |
| } |
| else |
| { |
| Memory::Region region = ResolveValue(value, module); |
| DataExtractorSP value_extractor = m_memory.GetExtractor(region); |
| |
| if (!value_extractor) |
| return false; |
| |
| size_t value_size = m_target_data.getTypeStoreSize(value->getType()); |
| |
| uint32_t offset = 0; |
| 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) |
| { |
| Memory::Region region = ResolveValue (value, module); |
| |
| lldb_private::Scalar cast_scalar; |
| |
| if (!AssignToMatchType(cast_scalar, scalar.GetRawBits64(0), value->getType())) |
| return false; |
| |
| lldb_private::DataBufferHeap buf(cast_scalar.GetByteSize(), 0); |
| |
| lldb_private::Error err; |
| |
| if (!cast_scalar.GetAsMemoryData(buf.GetBytes(), buf.GetByteSize(), m_byte_order, err)) |
| return false; |
| |
| DataEncoderSP region_encoder = m_memory.GetEncoder(region); |
| |
| memcpy(region_encoder->GetDataStart(), buf.GetBytes(), buf.GetByteSize()); |
| |
| return true; |
| } |
| |
| bool ResolveConstantValue (APInt &value, const Constant *constant) |
| { |
| if (const ConstantInt *constant_int = dyn_cast<ConstantInt>(constant)) |
| { |
| value = constant_int->getValue(); |
| return true; |
| } |
| else if (const ConstantFP *constant_fp = dyn_cast<ConstantFP>(constant)) |
| { |
| value = constant_fp->getValueAPF().bitcastToAPInt(); |
| return true; |
| } |
| else if (const ConstantExpr *constant_expr = dyn_cast<ConstantExpr>(constant)) |
| { |
| switch (constant_expr->getOpcode()) |
| { |
| default: |
| return false; |
| case Instruction::IntToPtr: |
| 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; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| bool ResolveConstant (Memory::Region ®ion, 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()); |
| return m_memory.Write(region.m_base, (const uint8_t*)raw_data, constant_size); |
| } |
| |
| Memory::Region ResolveValue (const Value *value, Module &module) |
| { |
| ValueMap::iterator i = m_values.find(value); |
| |
| if (i != m_values.end()) |
| return i->second; |
| |
| const GlobalValue *global_value = dyn_cast<GlobalValue>(value); |
| |
| // If the variable is indirected through the argument |
| // array then we need to build an extra level of indirection |
| // for it. This is the default; only magic arguments like |
| // "this", "self", and "_cmd" are direct. |
| bool indirect_variable = true; |
| |
| // Attempt to resolve the value using the program's data. |
| // If it is, the values to be created are: |
| // |
| // data_region - a region of memory in which the variable's data resides. |
| // ref_region - a region of memory in which its address (i.e., &var) resides. |
| // In the JIT case, this region would be a member of the struct passed in. |
| // pointer_region - a region of memory in which the address of the pointer |
| // resides. This is an IR-level variable. |
| do |
| { |
| lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| lldb_private::Value resolved_value; |
| lldb_private::ClangExpressionVariable::FlagType flags; |
| |
| if (global_value) |
| { |
| clang::NamedDecl *decl = IRForTarget::DeclForGlobal(global_value, &module); |
| |
| if (!decl) |
| break; |
| |
| if (isa<clang::FunctionDecl>(decl)) |
| { |
| if (log) |
| log->Printf("The interpreter does not handle function pointers at the moment"); |
| |
| return Memory::Region(); |
| } |
| |
| resolved_value = m_decl_map.LookupDecl(decl, flags); |
| } |
| else |
| { |
| // Special-case "this", "self", and "_cmd" |
| |
| std::string name_str = value->getName().str(); |
| |
| if (name_str == "this" || |
| name_str == "self" || |
| name_str == "_cmd") |
| resolved_value = m_decl_map.GetSpecialValue(lldb_private::ConstString(name_str.c_str())); |
| |
| indirect_variable = false; |
| } |
| |
| if (resolved_value.GetScalar().GetType() != lldb_private::Scalar::e_void) |
| { |
| if (resolved_value.GetContextType() == lldb_private::Value::eContextTypeRegisterInfo) |
| { |
| bool bare_register = (flags & lldb_private::ClangExpressionVariable::EVBareRegister); |
| |
| if (bare_register) |
| indirect_variable = false; |
| |
| Memory::Region data_region = m_memory.Malloc(value->getType()); |
| data_region.m_allocation->m_origin = resolved_value; |
| Memory::Region ref_region = m_memory.Malloc(value->getType()); |
| Memory::Region pointer_region; |
| |
| if (indirect_variable) |
| pointer_region = m_memory.Malloc(value->getType()); |
| |
| if (!Cache(data_region.m_allocation, value->getType())) |
| return Memory::Region(); |
| |
| if (ref_region.IsInvalid()) |
| return Memory::Region(); |
| |
| if (pointer_region.IsInvalid() && indirect_variable) |
| return Memory::Region(); |
| |
| DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); |
| |
| if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) |
| return Memory::Region(); |
| |
| if (log) |
| { |
| log->Printf("Made an allocation for register variable %s", PrintValue(value).c_str()); |
| log->Printf(" Data contents : %s", m_memory.PrintData(data_region.m_base, data_region.m_extent).c_str()); |
| log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); |
| log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); |
| if (indirect_variable) |
| log->Printf(" Pointer region : %llx", (unsigned long long)pointer_region.m_base); |
| } |
| |
| if (indirect_variable) |
| { |
| DataEncoderSP pointer_encoder = m_memory.GetEncoder(pointer_region); |
| |
| if (pointer_encoder->PutAddress(0, ref_region.m_base) == UINT32_MAX) |
| return Memory::Region(); |
| |
| m_values[value] = pointer_region; |
| return pointer_region; |
| } |
| else |
| { |
| m_values[value] = ref_region; |
| return ref_region; |
| } |
| } |
| else |
| { |
| Memory::Region data_region = m_memory.Place(value->getType(), resolved_value.GetScalar().ULongLong(), resolved_value); |
| Memory::Region ref_region = m_memory.Malloc(value->getType()); |
| Memory::Region pointer_region; |
| |
| if (indirect_variable) |
| pointer_region = m_memory.Malloc(value->getType()); |
| |
| if (ref_region.IsInvalid()) |
| return Memory::Region(); |
| |
| if (pointer_region.IsInvalid() && indirect_variable) |
| return Memory::Region(); |
| |
| DataEncoderSP ref_encoder = m_memory.GetEncoder(ref_region); |
| |
| if (ref_encoder->PutAddress(0, data_region.m_base) == UINT32_MAX) |
| return Memory::Region(); |
| |
| if (indirect_variable) |
| { |
| DataEncoderSP pointer_encoder = m_memory.GetEncoder(pointer_region); |
| |
| if (pointer_encoder->PutAddress(0, ref_region.m_base) == UINT32_MAX) |
| return Memory::Region(); |
| |
| m_values[value] = pointer_region; |
| } |
| |
| if (log) |
| { |
| log->Printf("Made an allocation for %s", PrintValue(value).c_str()); |
| log->Printf(" Data contents : %s", m_memory.PrintData(data_region.m_base, data_region.m_extent).c_str()); |
| log->Printf(" Data region : %llx", (unsigned long long)data_region.m_base); |
| log->Printf(" Ref region : %llx", (unsigned long long)ref_region.m_base); |
| if (indirect_variable) |
| log->Printf(" Pointer region : %llx", (unsigned long long)pointer_region.m_base); |
| } |
| |
| if (indirect_variable) |
| return pointer_region; |
| else |
| return ref_region; |
| } |
| } |
| } |
| while(0); |
| |
| // Fall back and allocate space [allocation type Alloca] |
| |
| Type *type = value->getType(); |
| |
| lldb::ValueSP backing_value(new lldb_private::Value); |
| |
| Memory::Region data_region = m_memory.Malloc(type); |
| data_region.m_allocation->m_origin.GetScalar() = (unsigned long long)data_region.m_allocation->m_data->GetBytes(); |
| data_region.m_allocation->m_origin.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); |
| data_region.m_allocation->m_origin.SetValueType(lldb_private::Value::eValueTypeHostAddress); |
| |
| const Constant *constant = dyn_cast<Constant>(value); |
| |
| do |
| { |
| if (!constant) |
| break; |
| |
| if (!ResolveConstant (data_region, constant)) |
| return Memory::Region(); |
| } |
| while(0); |
| |
| m_values[value] = data_region; |
| return data_region; |
| } |
| |
| bool ConstructResult (lldb::ClangExpressionVariableSP &result, |
| const GlobalValue *result_value, |
| const lldb_private::ConstString &result_name, |
| lldb_private::TypeFromParser result_type, |
| Module &module) |
| { |
| // The result_value resolves to P, a pointer to a region R containing the result data. |
| // If the result variable is a reference, the region R contains a pointer to the result R_final in the original process. |
| |
| if (!result_value) |
| return true; // There was no slot for a result – the expression doesn't return one. |
| |
| ValueMap::iterator i = m_values.find(result_value); |
| |
| if (i == m_values.end()) |
| return false; // There was a slot for the result, but we didn't write into it. |
| |
| Memory::Region P = i->second; |
| DataExtractorSP P_extractor = m_memory.GetExtractor(P); |
| |
| if (!P_extractor) |
| return false; |
| |
| Type *pointer_ty = result_value->getType(); |
| PointerType *pointer_ptr_ty = dyn_cast<PointerType>(pointer_ty); |
| if (!pointer_ptr_ty) |
| return false; |
| Type *R_ty = pointer_ptr_ty->getElementType(); |
| |
| uint32_t offset = 0; |
| lldb::addr_t pointer = P_extractor->GetAddress(&offset); |
| |
| Memory::Region R = m_memory.Lookup(pointer, R_ty); |
| |
| if (R.m_allocation->m_origin.GetValueType() != lldb_private::Value::eValueTypeHostAddress || |
| !R.m_allocation->m_data) |
| return false; |
| |
| lldb_private::Value base; |
| |
| bool transient = false; |
| bool maybe_make_load = false; |
| |
| if (m_decl_map.ResultIsReference(result_name)) |
| { |
| PointerType *R_ptr_ty = dyn_cast<PointerType>(R_ty); |
| if (!R_ptr_ty) |
| return false; |
| Type *R_final_ty = R_ptr_ty->getElementType(); |
| |
| DataExtractorSP R_extractor = m_memory.GetExtractor(R); |
| |
| if (!R_extractor) |
| return false; |
| |
| offset = 0; |
| lldb::addr_t R_pointer = R_extractor->GetAddress(&offset); |
| |
| Memory::Region R_final = m_memory.Lookup(R_pointer, R_final_ty); |
| |
| if (R_final.m_allocation) |
| { |
| if (R_final.m_allocation->m_data) |
| transient = true; // this is a stack allocation |
| |
| base = R_final.m_allocation->m_origin; |
| base.GetScalar() += (R_final.m_base - R_final.m_allocation->m_virtual_address); |
| } |
| else |
| { |
| // We got a bare pointer. We are going to treat it as a load address |
| // or a file address, letting decl_map make the choice based on whether |
| // or not a process exists. |
| |
| base.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); |
| base.SetValueType(lldb_private::Value::eValueTypeFileAddress); |
| base.GetScalar() = (unsigned long long)R_pointer; |
| maybe_make_load = true; |
| } |
| } |
| else |
| { |
| base.SetContext(lldb_private::Value::eContextTypeInvalid, NULL); |
| base.SetValueType(lldb_private::Value::eValueTypeHostAddress); |
| base.GetScalar() = (unsigned long long)R.m_allocation->m_data->GetBytes() + (R.m_base - R.m_allocation->m_virtual_address); |
| } |
| |
| return m_decl_map.CompleteResultVariable (result, base, result_name, result_type, transient, maybe_make_load); |
| } |
| }; |
| |
| bool |
| IRInterpreter::maybeRunOnFunction (lldb::ClangExpressionVariableSP &result, |
| const lldb_private::ConstString &result_name, |
| lldb_private::TypeFromParser result_type, |
| Function &llvm_function, |
| Module &llvm_module, |
| lldb_private::Error &err) |
| { |
| if (supportsFunction (llvm_function, err)) |
| return runOnFunction(result, |
| result_name, |
| result_type, |
| llvm_function, |
| llvm_module, |
| err); |
| else |
| return false; |
| } |
| |
| static const char *unsupported_opcode_error = "Interpreter doesn't handle one of the expression's opcodes"; |
| 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::supportsFunction (Function &llvm_function, |
| lldb_private::Error &err) |
| { |
| lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| for (Function::iterator bbi = llvm_function.begin(), bbe = llvm_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()); |
| err.SetErrorToGenericError(); |
| err.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) |
| { |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| switch (icmp_inst->getPredicate()) |
| { |
| default: |
| { |
| if (log) |
| log->Printf("Unsupported ICmp predicate: %s", PrintValue(ii).c_str()); |
| |
| err.SetErrorToGenericError(); |
| err.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::IntToPtr: |
| case Instruction::Load: |
| case Instruction::Mul: |
| case Instruction::Ret: |
| case Instruction::SDiv: |
| case Instruction::Store: |
| case Instruction::Sub: |
| case Instruction::UDiv: |
| break; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| bool |
| IRInterpreter::runOnFunction (lldb::ClangExpressionVariableSP &result, |
| const lldb_private::ConstString &result_name, |
| lldb_private::TypeFromParser result_type, |
| Function &llvm_function, |
| Module &llvm_module, |
| lldb_private::Error &err) |
| { |
| lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); |
| |
| lldb_private::ClangExpressionDeclMap::TargetInfo target_info = m_decl_map.GetTargetInfo(); |
| |
| if (!target_info.IsValid()) |
| { |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_initialization_error); |
| return false; |
| } |
| |
| lldb::addr_t alloc_min; |
| lldb::addr_t alloc_max; |
| |
| switch (target_info.address_byte_size) |
| { |
| default: |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_initialization_error); |
| return false; |
| case 4: |
| alloc_min = 0x00001000llu; |
| alloc_max = 0x0000ffffllu; |
| break; |
| case 8: |
| alloc_min = 0x0000000000001000llu; |
| alloc_max = 0x000000000000ffffllu; |
| break; |
| } |
| |
| TargetData target_data(&llvm_module); |
| if (target_data.getPointerSize() != target_info.address_byte_size) |
| { |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_initialization_error); |
| return false; |
| } |
| if (target_data.isLittleEndian() != (target_info.byte_order == lldb::eByteOrderLittle)) |
| { |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_initialization_error); |
| return false; |
| } |
| |
| Memory memory(target_data, m_decl_map, alloc_min, alloc_max); |
| InterpreterStackFrame frame(target_data, memory, m_decl_map); |
| |
| uint32_t num_insts = 0; |
| |
| frame.Jump(llvm_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: |
| { |
| 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()); |
| err.SetErrorToGenericError(); |
| err.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, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); |
| err.SetErrorToGenericError(); |
| err.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: |
| result = L / R; |
| break; |
| case Instruction::UDiv: |
| result = L.GetRawBits64(0) / R.GetRawBits64(1); |
| break; |
| } |
| |
| frame.AssignValue(inst, result, llvm_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"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| if (alloca_inst->isArrayAllocation()) |
| { |
| if (log) |
| log->Printf("AllocaInsts are not handled if isArrayAllocation() is true"); |
| err.SetErrorToGenericError(); |
| err.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(); |
| |
| Memory::Region R = memory.Malloc(T); |
| |
| if (R.IsInvalid()) |
| { |
| if (log) |
| log->Printf("Couldn't allocate memory for an AllocaInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_allocation_error); |
| return false; |
| } |
| |
| Memory::Region P = memory.Malloc(Tptr); |
| |
| if (P.IsInvalid()) |
| { |
| if (log) |
| log->Printf("Couldn't allocate the result pointer for an AllocaInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_allocation_error); |
| return false; |
| } |
| |
| DataEncoderSP P_encoder = memory.GetEncoder(P); |
| |
| if (P_encoder->PutAddress(0, R.m_base) == UINT32_MAX) |
| { |
| if (log) |
| log->Printf("Couldn't write the result pointer for an AllocaInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_write_error); |
| return false; |
| } |
| |
| frame.m_values[alloca_inst] = P; |
| |
| if (log) |
| { |
| log->Printf("Interpreted an AllocaInst"); |
| log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); |
| log->Printf(" P : %s", frame.SummarizeValue(alloca_inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::BitCast: |
| { |
| const BitCastInst *bit_cast_inst = dyn_cast<BitCastInst>(inst); |
| |
| if (!bit_cast_inst) |
| { |
| if (log) |
| log->Printf("getOpcode() returns BitCast, but instruction is not a BitCastInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| Value *source = bit_cast_inst->getOperand(0); |
| |
| lldb_private::Scalar S; |
| |
| if (!frame.EvaluateValue(S, source, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(source).c_str()); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| frame.AssignValue(inst, S, llvm_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"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| |
| if (br_inst->isConditional()) |
| { |
| Value *condition = br_inst->getCondition(); |
| |
| lldb_private::Scalar C; |
| |
| if (!frame.EvaluateValue(C, condition, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(condition).c_str()); |
| err.SetErrorToGenericError(); |
| err.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"); |
| err.SetErrorToGenericError(); |
| err.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, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(pointer_operand).c_str()); |
| err.SetErrorToGenericError(); |
| err.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, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(*ii).c_str()); |
| err.SetErrorToGenericError(); |
| err.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 = target_data.getIndexedOffset(pointer_type, const_indices); |
| |
| lldb_private::Scalar Poffset = P + offset; |
| |
| frame.AssignValue(inst, Poffset, llvm_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"); |
| err.SetErrorToGenericError(); |
| err.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, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(lhs).c_str()); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (!frame.EvaluateValue(R, rhs, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(rhs).c_str()); |
| err.SetErrorToGenericError(); |
| err.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: |
| result = (L > R); |
| break; |
| case CmpInst::ICMP_SGE: |
| result = (L >= R); |
| break; |
| case CmpInst::ICMP_SLT: |
| result = (L < R); |
| break; |
| case CmpInst::ICMP_SLE: |
| result = (L <= R); |
| break; |
| } |
| |
| frame.AssignValue(inst, result, llvm_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"); |
| err.SetErrorToGenericError(); |
| err.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, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't evaluate %s", PrintValue(src_operand).c_str()); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| frame.AssignValue(inst, I, llvm_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::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"); |
| err.SetErrorToGenericError(); |
| err.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"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(interpreter_internal_error); |
| return false; |
| } |
| Type *target_ty = pointer_ptr_ty->getElementType(); |
| |
| Memory::Region D = frame.ResolveValue(load_inst, llvm_module); |
| Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module); |
| |
| if (D.IsInvalid()) |
| { |
| if (log) |
| log->Printf("LoadInst's value doesn't resolve to anything"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P.IsInvalid()) |
| { |
| if (log) |
| log->Printf("LoadInst's pointer doesn't resolve to anything"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| DataExtractorSP P_extractor(memory.GetExtractor(P)); |
| DataEncoderSP D_encoder(memory.GetEncoder(D)); |
| |
| uint32_t offset = 0; |
| lldb::addr_t pointer = P_extractor->GetAddress(&offset); |
| |
| Memory::Region R = memory.Lookup(pointer, target_ty); |
| |
| if (R.IsValid()) |
| { |
| if (!memory.Read(D_encoder->GetDataStart(), R.m_base, target_data.getTypeStoreSize(target_ty))) |
| { |
| if (log) |
| log->Printf("Couldn't read from a region on behalf of a LoadInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_read_error); |
| return false; |
| } |
| } |
| else |
| { |
| if (!memory.ReadFromRawPtr(D_encoder->GetDataStart(), pointer, target_data.getTypeStoreSize(target_ty))) |
| { |
| if (log) |
| log->Printf("Couldn't read from a raw pointer on behalf of a LoadInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_read_error); |
| return false; |
| } |
| } |
| |
| if (log) |
| { |
| log->Printf("Interpreted a LoadInst"); |
| log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); |
| if (R.IsValid()) |
| log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); |
| else |
| log->Printf(" R : raw pointer 0x%llx", (unsigned long long)pointer); |
| log->Printf(" D : %s", frame.SummarizeValue(load_inst).c_str()); |
| } |
| } |
| break; |
| case Instruction::Ret: |
| { |
| if (result_name.IsEmpty()) |
| return true; |
| |
| GlobalValue *result_value = llvm_module.getNamedValue(result_name.GetCString()); |
| |
| if (!frame.ConstructResult(result, result_value, result_name, result_type, llvm_module)) |
| { |
| if (log) |
| log->Printf("Couldn't construct the expression's result"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_result_error); |
| return false; |
| } |
| |
| 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"); |
| err.SetErrorToGenericError(); |
| err.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(); |
| |
| Memory::Region D = frame.ResolveValue(value_operand, llvm_module); |
| Memory::Region P = frame.ResolveValue(pointer_operand, llvm_module); |
| |
| if (D.IsInvalid()) |
| { |
| if (log) |
| log->Printf("StoreInst's value doesn't resolve to anything"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| if (P.IsInvalid()) |
| { |
| if (log) |
| log->Printf("StoreInst's pointer doesn't resolve to anything"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(bad_value_error); |
| return false; |
| } |
| |
| DataExtractorSP P_extractor(memory.GetExtractor(P)); |
| DataExtractorSP D_extractor(memory.GetExtractor(D)); |
| |
| if (!P_extractor || !D_extractor) |
| return false; |
| |
| uint32_t offset = 0; |
| lldb::addr_t pointer = P_extractor->GetAddress(&offset); |
| |
| Memory::Region R = memory.Lookup(pointer, target_ty); |
| |
| if (R.IsValid()) |
| { |
| if (!memory.Write(R.m_base, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty))) |
| { |
| if (log) |
| log->Printf("Couldn't write to a region on behalf of a LoadInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_write_error); |
| return false; |
| } |
| } |
| else |
| { |
| if (!memory.WriteToRawPtr(pointer, D_extractor->GetDataStart(), target_data.getTypeStoreSize(target_ty))) |
| { |
| if (log) |
| log->Printf("Couldn't write to a raw pointer on behalf of a LoadInst"); |
| err.SetErrorToGenericError(); |
| err.SetErrorString(memory_write_error); |
| return false; |
| } |
| } |
| |
| |
| if (log) |
| { |
| log->Printf("Interpreted a StoreInst"); |
| log->Printf(" D : %s", frame.SummarizeValue(value_operand).c_str()); |
| log->Printf(" P : %s", frame.SummarizeValue(pointer_operand).c_str()); |
| log->Printf(" R : %s", memory.SummarizeRegion(R).c_str()); |
| } |
| } |
| break; |
| } |
| |
| ++frame.m_ii; |
| } |
| |
| if (num_insts >= 4096) |
| { |
| err.SetErrorToGenericError(); |
| err.SetErrorString(infinite_loop_error); |
| return false; |
| } |
| |
| return false; |
| } |
