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
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 std::string destination;
27 StreamString sstr;
28 AddressType func_ptr_address_type = eAddressTypeInvalid;
29 addr_t func_ptr_address = valobj.GetPointerValue(address_type: &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(load_addr: 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(pc: func_ptr_address);
56 if (fixed_addr != func_ptr_address) {
57 Address test_address;
58 test_address.SetLoadAddress(load_addr: fixed_addr, target);
59 if (test_address.GetSection() != nullptr) {
60 int addrsize = target->GetArchitecture().GetAddressByteSize();
61 sstr.Printf(format: "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(s: &sstr, exe_scope: exe_ctx.GetBestExecutionContextScope(),
72 style: Address::DumpStyleResolvedDescription,
73 fallback_style: Address::DumpStyleSectionNameOffset);
74 }
75 }
76 } break;
77 }
78 }
79 if (sstr.GetSize() > 0) {
80 if (valobj.GetValueType() == lldb::eValueTypeVTableEntry)
81 stream.PutCString(cstr: sstr.GetData());
82 else
83 stream.Printf(format: "(%s)", sstr.GetData());
84 return true;
85 } else
86 return false;
87}
88

source code of lldb/source/DataFormatters/CXXFunctionPointer.cpp