85 lines · cpp
1//===-- CXXFunctionPointer.cpp---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "lldb/DataFormatters/CXXFunctionPointer.h"10 11#include "lldb/Target/ABI.h"12#include "lldb/Target/SectionLoadList.h"13#include "lldb/Target/Target.h"14#include "lldb/Utility/Stream.h"15#include "lldb/ValueObject/ValueObject.h"16#include "lldb/lldb-enumerations.h"17 18#include <string>19 20using namespace lldb;21using namespace lldb_private;22using namespace lldb_private::formatters;23 24bool lldb_private::formatters::CXXFunctionPointerSummaryProvider(25 ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {26 StreamString sstr;27 auto [func_ptr_address, func_ptr_address_type] = valobj.GetPointerValue();28 if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS) {29 switch (func_ptr_address_type) {30 case eAddressTypeInvalid:31 case eAddressTypeFile:32 case eAddressTypeHost:33 break;34 35 case eAddressTypeLoad: {36 ExecutionContext exe_ctx(valobj.GetExecutionContextRef());37 38 Address so_addr;39 Target *target = exe_ctx.GetTargetPtr();40 if (target && target->HasLoadedSections()) {41 target->ResolveLoadAddress(func_ptr_address, so_addr);42 if (so_addr.GetSection() == nullptr) {43 // If we have an address that doesn't correspond to any symbol,44 // it might have authentication bits. Strip them & see if it45 // now points to a symbol -- if so, do the SymbolContext lookup46 // based on the stripped address.47 // If we find a symbol with the ptrauth bits stripped, print the48 // raw value into the stream, and replace the Address with the49 // one that points to a symbol for a fuller description.50 if (Process *process = exe_ctx.GetProcessPtr()) {51 if (ABISP abi_sp = process->GetABI()) {52 addr_t fixed_addr = abi_sp->FixCodeAddress(func_ptr_address);53 if (fixed_addr != func_ptr_address) {54 Address test_address;55 test_address.SetLoadAddress(fixed_addr, target);56 if (test_address.GetSection() != nullptr) {57 int addrsize = target->GetArchitecture().GetAddressByteSize();58 sstr.Printf("actual=0x%*.*" PRIx64 " ", addrsize * 2,59 addrsize * 2, fixed_addr);60 so_addr = test_address;61 }62 }63 }64 }65 }66 67 if (so_addr.IsValid()) {68 so_addr.Dump(&sstr, exe_ctx.GetBestExecutionContextScope(),69 Address::DumpStyleResolvedDescription,70 Address::DumpStyleSectionNameOffset);71 }72 }73 } break;74 }75 }76 if (sstr.GetSize() > 0) {77 if (valobj.GetValueType() == lldb::eValueTypeVTableEntry)78 stream.PutCString(sstr.GetData());79 else80 stream.Printf("(%s)", sstr.GetData());81 return true;82 } else83 return false;84}85