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/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
20 using namespace lldb;
21 using namespace lldb_private;
22 using namespace lldb_private::formatters;
23
CXXFunctionPointerSummaryProvider(ValueObject & valobj,Stream & stream,const TypeSummaryOptions & options)24 bool 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 it
45 // now points to a symbol -- if so, do the SymbolContext lookup
46 // based on the stripped address.
47 // If we find a symbol with the ptrauth bits stripped, print the
48 // raw value into the stream, and replace the Address with the
49 // 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 else
80 stream.Printf("(%s)", sstr.GetData());
81 return true;
82 } else
83 return false;
84 }
85