xref: /openbsd-src/gnu/llvm/lldb/source/DataFormatters/CXXFunctionPointer.cpp (revision f6aab3d83b51b91c24247ad2c2573574de475a82)
1dda28197Spatrick //===-- CXXFunctionPointer.cpp---------------------------------------------===//
2061da546Spatrick //
3061da546Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4061da546Spatrick // See https://llvm.org/LICENSE.txt for license information.
5061da546Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6061da546Spatrick //
7061da546Spatrick //===----------------------------------------------------------------------===//
8061da546Spatrick 
9061da546Spatrick #include "lldb/DataFormatters/CXXFunctionPointer.h"
10061da546Spatrick 
11061da546Spatrick #include "lldb/Core/ValueObject.h"
12*f6aab3d8Srobert #include "lldb/Target/ABI.h"
13061da546Spatrick #include "lldb/Target/SectionLoadList.h"
14061da546Spatrick #include "lldb/Target/Target.h"
15061da546Spatrick #include "lldb/Utility/Stream.h"
16061da546Spatrick 
17061da546Spatrick #include <string>
18061da546Spatrick 
19061da546Spatrick using namespace lldb;
20061da546Spatrick using namespace lldb_private;
21061da546Spatrick using namespace lldb_private::formatters;
22061da546Spatrick 
CXXFunctionPointerSummaryProvider(ValueObject & valobj,Stream & stream,const TypeSummaryOptions & options)23061da546Spatrick bool lldb_private::formatters::CXXFunctionPointerSummaryProvider(
24061da546Spatrick     ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
25061da546Spatrick   std::string destination;
26061da546Spatrick   StreamString sstr;
27061da546Spatrick   AddressType func_ptr_address_type = eAddressTypeInvalid;
28061da546Spatrick   addr_t func_ptr_address = valobj.GetPointerValue(&func_ptr_address_type);
29061da546Spatrick   if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS) {
30061da546Spatrick     switch (func_ptr_address_type) {
31061da546Spatrick     case eAddressTypeInvalid:
32061da546Spatrick     case eAddressTypeFile:
33061da546Spatrick     case eAddressTypeHost:
34061da546Spatrick       break;
35061da546Spatrick 
36061da546Spatrick     case eAddressTypeLoad: {
37061da546Spatrick       ExecutionContext exe_ctx(valobj.GetExecutionContextRef());
38061da546Spatrick 
39061da546Spatrick       Address so_addr;
40061da546Spatrick       Target *target = exe_ctx.GetTargetPtr();
41061da546Spatrick       if (target && !target->GetSectionLoadList().IsEmpty()) {
42*f6aab3d8Srobert         target->GetSectionLoadList().ResolveLoadAddress(func_ptr_address,
43*f6aab3d8Srobert                                                         so_addr);
44*f6aab3d8Srobert         if (so_addr.GetSection() == nullptr) {
45*f6aab3d8Srobert           // If we have an address that doesn't correspond to any symbol,
46*f6aab3d8Srobert           // it might have authentication bits.  Strip them & see if it
47*f6aab3d8Srobert           // now points to a symbol -- if so, do the SymbolContext lookup
48*f6aab3d8Srobert           // based on the stripped address.
49*f6aab3d8Srobert           // If we find a symbol with the ptrauth bits stripped, print the
50*f6aab3d8Srobert           // raw value into the stream, and replace the Address with the
51*f6aab3d8Srobert           // one that points to a symbol for a fuller description.
52*f6aab3d8Srobert           if (Process *process = exe_ctx.GetProcessPtr()) {
53*f6aab3d8Srobert             if (ABISP abi_sp = process->GetABI()) {
54*f6aab3d8Srobert               addr_t fixed_addr = abi_sp->FixCodeAddress(func_ptr_address);
55*f6aab3d8Srobert               if (fixed_addr != func_ptr_address) {
56*f6aab3d8Srobert                 Address test_address;
57*f6aab3d8Srobert                 test_address.SetLoadAddress(fixed_addr, target);
58*f6aab3d8Srobert                 if (test_address.GetSection() != nullptr) {
59*f6aab3d8Srobert                   int addrsize = target->GetArchitecture().GetAddressByteSize();
60*f6aab3d8Srobert                   sstr.Printf("actual=0x%*.*" PRIx64 " ", addrsize * 2,
61*f6aab3d8Srobert                               addrsize * 2, fixed_addr);
62*f6aab3d8Srobert                   so_addr = test_address;
63*f6aab3d8Srobert                 }
64*f6aab3d8Srobert               }
65*f6aab3d8Srobert             }
66*f6aab3d8Srobert           }
67*f6aab3d8Srobert         }
68*f6aab3d8Srobert 
69*f6aab3d8Srobert         if (so_addr.IsValid()) {
70061da546Spatrick           so_addr.Dump(&sstr, exe_ctx.GetBestExecutionContextScope(),
71061da546Spatrick                        Address::DumpStyleResolvedDescription,
72061da546Spatrick                        Address::DumpStyleSectionNameOffset);
73061da546Spatrick         }
74061da546Spatrick       }
75061da546Spatrick     } break;
76061da546Spatrick     }
77061da546Spatrick   }
78061da546Spatrick   if (sstr.GetSize() > 0) {
79061da546Spatrick     stream.Printf("(%s)", sstr.GetData());
80061da546Spatrick     return true;
81061da546Spatrick   } else
82061da546Spatrick     return false;
83061da546Spatrick }
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