| 1 | //===-- CXXFunctionPointer.cpp---------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "lldb/DataFormatters/CXXFunctionPointer.h" |
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| 10 | |
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| 11 | #include "lldb/Target/ABI.h" |
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| 12 | #include "lldb/Target/SectionLoadList.h" |
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| 13 | #include "lldb/Target/Target.h" |
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| 14 | #include "lldb/Utility/Stream.h" |
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| 15 | #include "lldb/ValueObject/ValueObject.h" |
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| 16 | #include "lldb/lldb-enumerations.h" |
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| 17 | |
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| 18 | #include <string> |
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| 19 | |
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| 20 | using namespace lldb; |
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| 21 | using namespace lldb_private; |
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| 22 | using namespace lldb_private::formatters; |
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| 23 | |
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| 24 | bool lldb_private::formatters::CXXFunctionPointerSummaryProvider( |
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| 25 | ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) { |
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| 26 | StreamString sstr; |
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| 27 | auto [func_ptr_address, func_ptr_address_type] = valobj.GetPointerValue(); |
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| 28 | if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS) { |
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| 29 | switch (func_ptr_address_type) { |
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| 30 | case eAddressTypeInvalid: |
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| 31 | case eAddressTypeFile: |
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| 32 | case eAddressTypeHost: |
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| 33 | break; |
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| 34 | |
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| 35 | case eAddressTypeLoad: { |
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| 36 | ExecutionContext exe_ctx(valobj.GetExecutionContextRef()); |
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| 37 | |
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| 38 | Address so_addr; |
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| 39 | Target *target = exe_ctx.GetTargetPtr(); |
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| 40 | if (target && target->HasLoadedSections()) { |
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| 41 | target->ResolveLoadAddress(load_addr: func_ptr_address, so_addr); |
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| 42 | if (so_addr.GetSection() == nullptr) { |
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| 43 | // If we have an address that doesn't correspond to any symbol, |
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| 44 | // it might have authentication bits. Strip them & see if it |
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| 45 | // now points to a symbol -- if so, do the SymbolContext lookup |
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| 46 | // based on the stripped address. |
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| 47 | // If we find a symbol with the ptrauth bits stripped, print the |
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| 48 | // raw value into the stream, and replace the Address with the |
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| 49 | // one that points to a symbol for a fuller description. |
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| 50 | if (Process *process = exe_ctx.GetProcessPtr()) { |
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| 51 | if (ABISP abi_sp = process->GetABI()) { |
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| 52 | addr_t fixed_addr = abi_sp->FixCodeAddress(pc: func_ptr_address); |
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| 53 | if (fixed_addr != func_ptr_address) { |
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| 54 | Address test_address; |
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| 55 | test_address.SetLoadAddress(load_addr: fixed_addr, target); |
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| 56 | if (test_address.GetSection() != nullptr) { |
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| 57 | int addrsize = target->GetArchitecture().GetAddressByteSize(); |
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| 58 | sstr.Printf(format: "actual=0x%*.*" PRIx64 " " , addrsize * 2, |
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| 59 | addrsize * 2, fixed_addr); |
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| 60 | so_addr = test_address; |
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| 61 | } |
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| 62 | } |
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| 63 | } |
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| 64 | } |
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| 65 | } |
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| 66 | |
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| 67 | if (so_addr.IsValid()) { |
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| 68 | so_addr.Dump(s: &sstr, exe_scope: exe_ctx.GetBestExecutionContextScope(), |
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| 69 | style: Address::DumpStyleResolvedDescription, |
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| 70 | fallback_style: Address::DumpStyleSectionNameOffset); |
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| 71 | } |
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| 72 | } |
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| 73 | } break; |
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| 74 | } |
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| 75 | } |
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| 76 | if (sstr.GetSize() > 0) { |
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| 77 | if (valobj.GetValueType() == lldb::eValueTypeVTableEntry) |
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| 78 | stream.PutCString(cstr: sstr.GetData()); |
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| 79 | else |
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| 80 | stream.Printf(format: "(%s)" , sstr.GetData()); |
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| 81 | return true; |
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| 82 | } else |
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| 83 | return false; |
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| 84 | } |
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| 85 | |
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