lldb/source/DataFormatters/CXXFunctionPointer.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lldb/DataFormatters/CXXFunctionPointer.h"
  10
  11 #include "lldb/Core/ValueObject.h"
  12 #include "lldb/Target/ABI.h"
  13 #include "lldb/Target/SectionLoadList.h"
  14 #include "lldb/Target/Target.h"
  15 #include "lldb/Utility/Stream.h"
  16 #include "lldb/lldb-enumerations.h"
  17
  18 #include <string>
  19
  20 using namespace lldb;
  21 using namespace lldb_private;
  22 using namespace lldb_private::formatters;
  23
  24 bool lldb_private::formatters::CXXFunctionPointerSummaryProvider(
  25     ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
  26   std::string destination;
  27   StreamString sstr;
  28   AddressType func_ptr_address_type = eAddressTypeInvalid;
  29   addr_t func_ptr_address = valobj.GetPointerValue(&func_ptr_address_type);
  30   if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS) {
  31     switch (func_ptr_address_type) {
  32     case eAddressTypeInvalid:
  33     case eAddressTypeFile:
  34     case eAddressTypeHost:
  35       break;
  36
  37     case eAddressTypeLoad: {
  38       ExecutionContext exe_ctx(valobj.GetExecutionContextRef());
  39
  40       Address so_addr;
  41       Target *target = exe_ctx.GetTargetPtr();
  42       if (target && !target->GetSectionLoadList().IsEmpty()) {
  43         target->GetSectionLoadList().ResolveLoadAddress(func_ptr_address,
  44                                                         so_addr);
  45         if (so_addr.GetSection() == nullptr) {
  46           // If we have an address that doesn't correspond to any symbol,
  47           // it might have authentication bits.  Strip them & see if it
  48           // now points to a symbol -- if so, do the SymbolContext lookup
  49           // based on the stripped address.
  50           // If we find a symbol with the ptrauth bits stripped, print the
  51           // raw value into the stream, and replace the Address with the
  52           // one that points to a symbol for a fuller description.
  53           if (Process *process = exe_ctx.GetProcessPtr()) {
  54             if (ABISP abi_sp = process->GetABI()) {
  55               addr_t fixed_addr = abi_sp->FixCodeAddress(func_ptr_address);
  56               if (fixed_addr != func_ptr_address) {
  57                 Address test_address;
  58                 test_address.SetLoadAddress(fixed_addr, target);
  59                 if (test_address.GetSection() != nullptr) {
  60                   int addrsize = target->GetArchitecture().GetAddressByteSize();
  61                   sstr.Printf("actual=0x%*.*" PRIx64 " ", addrsize * 2,
  62                               addrsize * 2, fixed_addr);
  63                   so_addr = test_address;
  64                 }
  65               }
  66             }
  67           }
  68         }
  69
  70         if (so_addr.IsValid()) {
  71           so_addr.Dump(&sstr, exe_ctx.GetBestExecutionContextScope(),
  72                        Address::DumpStyleResolvedDescription,
  73                        Address::DumpStyleSectionNameOffset);
  74         }
  75       }
  76     } break;
  77     }
  78   }
  79   if (sstr.GetSize() > 0) {
  80     if (valobj.GetValueType() == lldb::eValueTypeVTableEntry)
  81       stream.PutCString(sstr.GetData());
  82     else
  83       stream.Printf("(%s)", sstr.GetData());
  84     return true;
  85   } else
  86     return false;
  87 }