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