[2573] | 1 | #ifdef CPPTRACE_GET_SYMBOLS_WITH_DBGHELP |
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| 2 | |
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| 3 | #include "cpptrace.hpp" |
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| 4 | #include "symbols.hpp" |
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| 5 | #include "program_name.hpp" |
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| 6 | |
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| 7 | #include <memory> |
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| 8 | #include <regex> |
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| 9 | #include <stdexcept> |
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| 10 | #include <system_error> |
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| 11 | #include <vector> |
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| 12 | |
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| 13 | #include <windows.h> |
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| 14 | #include <dbghelp.h> |
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| 15 | |
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| 16 | namespace cpptrace { |
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| 17 | namespace detail { |
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| 18 | namespace dbghelp { |
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| 19 | |
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| 20 | // SymFromAddr only returns the function's name. In order to get information about parameters, |
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| 21 | // important for C++ stack traces where functions may be overloaded, we have to manually use |
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| 22 | // Windows DIA to walk debug info structures. Resources: |
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| 23 | // https://web.archive.org/web/20201027025750/http://www.debuginfo.com/articles/dbghelptypeinfo.html |
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| 24 | // https://web.archive.org/web/20201203160805/http://www.debuginfo.com/articles/dbghelptypeinfofigures.html |
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| 25 | // https://github.com/DynamoRIO/dynamorio/blob/master/ext/drsyms/drsyms_windows.c#L1370-L1439 |
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| 26 | // TODO: Currently unable to detect rvalue references |
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| 27 | // TODO: Currently unable to detect const |
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| 28 | enum class SymTagEnum { |
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| 29 | SymTagNull, SymTagExe, SymTagCompiland, SymTagCompilandDetails, SymTagCompilandEnv, |
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| 30 | SymTagFunction, SymTagBlock, SymTagData, SymTagAnnotation, SymTagLabel, SymTagPublicSymbol, |
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| 31 | SymTagUDT, SymTagEnum, SymTagFunctionType, SymTagPointerType, SymTagArrayType, |
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| 32 | SymTagBaseType, SymTagTypedef, SymTagBaseClass, SymTagFriend, SymTagFunctionArgType, |
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| 33 | SymTagFuncDebugStart, SymTagFuncDebugEnd, SymTagUsingNamespace, SymTagVTableShape, |
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| 34 | SymTagVTable, SymTagCustom, SymTagThunk, SymTagCustomType, SymTagManagedType, |
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| 35 | SymTagDimension, SymTagCallSite, SymTagInlineSite, SymTagBaseInterface, SymTagVectorType, |
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| 36 | SymTagMatrixType, SymTagHLSLType, SymTagCaller, SymTagCallee, SymTagExport, |
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| 37 | SymTagHeapAllocationSite, SymTagCoffGroup, SymTagMax |
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| 38 | }; |
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| 39 | |
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| 40 | enum class IMAGEHLP_SYMBOL_TYPE_INFO { |
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| 41 | TI_GET_SYMTAG, TI_GET_SYMNAME, TI_GET_LENGTH, TI_GET_TYPE, TI_GET_TYPEID, TI_GET_BASETYPE, |
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| 42 | TI_GET_ARRAYINDEXTYPEID, TI_FINDCHILDREN, TI_GET_DATAKIND, TI_GET_ADDRESSOFFSET, |
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| 43 | TI_GET_OFFSET, TI_GET_VALUE, TI_GET_COUNT, TI_GET_CHILDRENCOUNT, TI_GET_BITPOSITION, |
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| 44 | TI_GET_VIRTUALBASECLASS, TI_GET_VIRTUALTABLESHAPEID, TI_GET_VIRTUALBASEPOINTEROFFSET, |
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| 45 | TI_GET_CLASSPARENTID, TI_GET_NESTED, TI_GET_SYMINDEX, TI_GET_LEXICALPARENT, TI_GET_ADDRESS, |
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| 46 | TI_GET_THISADJUST, TI_GET_UDTKIND, TI_IS_EQUIV_TO, TI_GET_CALLING_CONVENTION, |
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| 47 | TI_IS_CLOSE_EQUIV_TO, TI_GTIEX_REQS_VALID, TI_GET_VIRTUALBASEOFFSET, |
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| 48 | TI_GET_VIRTUALBASEDISPINDEX, TI_GET_IS_REFERENCE, TI_GET_INDIRECTVIRTUALBASECLASS, |
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| 49 | TI_GET_VIRTUALBASETABLETYPE, TI_GET_OBJECTPOINTERTYPE, IMAGEHLP_SYMBOL_TYPE_INFO_MAX |
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| 50 | }; |
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| 51 | |
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| 52 | enum class BasicType { |
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| 53 | btNoType = 0, btVoid = 1, btChar = 2, btWChar = 3, btInt = 6, btUInt = 7, btFloat = 8, |
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| 54 | btBCD = 9, btBool = 10, btLong = 13, btULong = 14, btCurrency = 25, btDate = 26, |
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| 55 | btVariant = 27, btComplex = 28, btBit = 29, btBSTR = 30, btHresult = 31 |
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| 56 | }; |
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| 57 | |
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| 58 | // SymGetTypeInfo utility |
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| 59 | template<typename T, IMAGEHLP_SYMBOL_TYPE_INFO SymType, bool FAILABLE = false> |
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| 60 | T get_info(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 61 | T info; |
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| 62 | if( |
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| 63 | !SymGetTypeInfo( |
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| 64 | proc, |
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| 65 | modbase, |
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| 66 | type_index, |
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| 67 | static_cast<::IMAGEHLP_SYMBOL_TYPE_INFO>(SymType), |
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| 68 | &info |
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| 69 | ) |
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| 70 | ) { |
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| 71 | if(FAILABLE) { |
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| 72 | return (T)-1; |
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| 73 | } else { |
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| 74 | throw std::logic_error( |
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| 75 | std::string("SymGetTypeInfo failed: ") |
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| 76 | + std::system_error(GetLastError(), std::system_category()).what() |
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| 77 | ); |
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| 78 | } |
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| 79 | } |
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| 80 | return info; |
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| 81 | } |
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| 82 | |
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| 83 | template<IMAGEHLP_SYMBOL_TYPE_INFO SymType, bool FAILABLE = false> |
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| 84 | std::string get_info_wchar(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 85 | WCHAR* info; |
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| 86 | if( |
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| 87 | !SymGetTypeInfo(proc, modbase, type_index, static_cast<::IMAGEHLP_SYMBOL_TYPE_INFO>(SymType), &info) |
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| 88 | ) { |
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| 89 | throw std::logic_error( |
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| 90 | std::string("SymGetTypeInfo failed: ") |
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| 91 | + std::system_error(GetLastError(), std::system_category()).what() |
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| 92 | ); |
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| 93 | } |
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| 94 | // special case to properly free a buffer and convert string to narrow chars, only used for |
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| 95 | // TI_GET_SYMNAME |
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| 96 | static_assert( |
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| 97 | SymType == IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_SYMNAME, |
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| 98 | "get_info_wchar called with unexpected IMAGEHLP_SYMBOL_TYPE_INFO" |
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| 99 | ); |
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| 100 | std::wstring wstr(info); |
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| 101 | std::string str; |
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| 102 | str.reserve(wstr.size()); |
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| 103 | for(const auto c : wstr) { |
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| 104 | str.push_back(static_cast<char>(c)); |
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| 105 | } |
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| 106 | LocalFree(info); |
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| 107 | return str; |
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| 108 | } |
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| 109 | |
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| 110 | // Translate basic types to string |
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| 111 | static std::string get_basic_type(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 112 | auto basic_type = get_info<BasicType, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_BASETYPE>( |
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| 113 | type_index, |
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| 114 | proc, |
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| 115 | modbase |
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| 116 | ); |
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| 117 | //auto length = get_info<ULONG64, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_LENGTH>(type_index, proc, modbase); |
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| 118 | switch(basic_type) { |
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| 119 | case BasicType::btNoType: |
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| 120 | return "<no basic type>"; |
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| 121 | case BasicType::btVoid: |
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| 122 | return "void"; |
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| 123 | case BasicType::btChar: |
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| 124 | return "char"; |
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| 125 | case BasicType::btWChar: |
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| 126 | return "wchar_t"; |
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| 127 | case BasicType::btInt: |
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| 128 | return "int"; |
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| 129 | case BasicType::btUInt: |
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| 130 | return "unsigned int"; |
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| 131 | case BasicType::btFloat: |
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| 132 | return "float"; |
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| 133 | case BasicType::btBool: |
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| 134 | return "bool"; |
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| 135 | case BasicType::btLong: |
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| 136 | return "long"; |
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| 137 | case BasicType::btULong: |
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| 138 | return "unsigned long"; |
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| 139 | default: |
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| 140 | return "<unknown basic type>"; |
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| 141 | } |
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| 142 | } |
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| 143 | |
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| 144 | static std::string resolve_type(ULONG type_index, HANDLE proc, ULONG64 modbase); |
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| 145 | |
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| 146 | struct class_name_result { |
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| 147 | bool has_class_name; |
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| 148 | std::string name; |
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| 149 | }; |
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| 150 | // Helper for member pointers |
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| 151 | static class_name_result lookup_class_name(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 152 | DWORD class_parent_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_CLASSPARENTID, true>( |
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| 153 | type_index, |
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| 154 | proc, |
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| 155 | modbase |
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| 156 | ); |
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| 157 | if(class_parent_id == (DWORD)-1) { |
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| 158 | return {false, ""}; |
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| 159 | } else { |
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| 160 | return {true, resolve_type(class_parent_id, proc, modbase)}; |
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| 161 | } |
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| 162 | } |
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| 163 | |
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| 164 | struct type_result { |
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| 165 | std::string base; |
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| 166 | std::string extent; |
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| 167 | }; |
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| 168 | // Resolve more complex types |
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| 169 | // returns [base, extent] |
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| 170 | static type_result lookup_type(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 171 | auto tag = get_info<SymTagEnum, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_SYMTAG>(type_index, proc, modbase); |
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| 172 | switch(tag) { |
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| 173 | case SymTagEnum::SymTagBaseType: |
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| 174 | return {get_basic_type(type_index, proc, modbase), ""}; |
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| 175 | case SymTagEnum::SymTagPointerType: { |
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| 176 | DWORD underlying_type_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_TYPEID>( |
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| 177 | type_index, |
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| 178 | proc, |
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| 179 | modbase |
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| 180 | ); |
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| 181 | bool is_ref = get_info<BOOL, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_IS_REFERENCE>( |
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| 182 | type_index, |
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| 183 | proc, |
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| 184 | modbase |
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| 185 | ); |
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| 186 | std::string pp = is_ref ? "&" : "*"; // pointer punctuator |
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| 187 | auto class_name_res = lookup_class_name(type_index, proc, modbase); |
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| 188 | if(class_name_res.has_class_name) { |
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| 189 | pp = class_name_res.name + "::" + pp; |
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| 190 | } |
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| 191 | const auto type = lookup_type(underlying_type_id, proc, modbase); |
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| 192 | if(type.extent.empty()) { |
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| 193 | return {type.base + (pp.size() > 1 ? " " : "") + pp, ""}; |
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| 194 | } else { |
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| 195 | return {type.base + "(" + pp, ")" + type.extent}; |
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| 196 | } |
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| 197 | } |
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| 198 | case SymTagEnum::SymTagArrayType: { |
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| 199 | DWORD underlying_type_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_TYPEID>( |
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| 200 | type_index, |
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| 201 | proc, |
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| 202 | modbase |
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| 203 | ); |
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| 204 | DWORD length = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_COUNT>( |
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| 205 | type_index, |
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| 206 | proc, |
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| 207 | modbase |
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| 208 | ); |
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| 209 | const auto type = lookup_type(underlying_type_id, proc, modbase); |
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| 210 | return {type.base, "[" + std::to_string(length) + "]" + type.extent}; |
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| 211 | } |
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| 212 | case SymTagEnum::SymTagFunctionType: { |
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| 213 | DWORD return_type_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_TYPEID>( |
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| 214 | type_index, |
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| 215 | proc, |
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| 216 | modbase |
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| 217 | ); |
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| 218 | DWORD n_children = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_COUNT, true>( |
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| 219 | type_index, |
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| 220 | proc, |
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| 221 | modbase |
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| 222 | ); |
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| 223 | DWORD class_parent_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_CLASSPARENTID, true>( |
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| 224 | type_index, |
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| 225 | proc, |
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| 226 | modbase |
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| 227 | ); |
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| 228 | int n_ignore = class_parent_id != (DWORD)-1; // ignore this param |
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| 229 | // this must be ignored before TI_FINDCHILDREN_PARAMS::Count is set, else error |
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| 230 | n_children -= n_ignore; |
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| 231 | // return type |
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| 232 | const auto return_type = lookup_type(return_type_id, proc, modbase); |
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| 233 | if(n_children == 0) { |
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| 234 | return {return_type.base, "()" + return_type.extent}; |
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| 235 | } else { |
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| 236 | // alignment should be fine |
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| 237 | size_t sz = sizeof(TI_FINDCHILDREN_PARAMS) + |
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| 238 | (n_children) * sizeof(TI_FINDCHILDREN_PARAMS::ChildId[0]); |
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| 239 | TI_FINDCHILDREN_PARAMS* children = (TI_FINDCHILDREN_PARAMS*) new char[sz]; |
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| 240 | children->Start = 0; |
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| 241 | children->Count = n_children; |
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| 242 | if( |
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| 243 | !SymGetTypeInfo( |
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| 244 | proc, modbase, type_index, |
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| 245 | static_cast<::IMAGEHLP_SYMBOL_TYPE_INFO>( |
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| 246 | IMAGEHLP_SYMBOL_TYPE_INFO::TI_FINDCHILDREN |
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| 247 | ), |
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| 248 | children |
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| 249 | ) |
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| 250 | ) { |
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| 251 | throw std::logic_error( |
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| 252 | std::string("SymGetTypeInfo failed: ") |
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| 253 | + std::system_error(GetLastError(), std::system_category()).what() |
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| 254 | ); |
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| 255 | } |
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| 256 | // get children type |
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| 257 | std::string extent = "("; |
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| 258 | if(children->Start != 0) { |
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| 259 | throw std::logic_error("Error: children->Start == 0"); |
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| 260 | } |
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| 261 | for(std::size_t i = 0; i < n_children; i++) { |
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| 262 | extent += (i == 0 ? "" : ", ") + resolve_type(children->ChildId[i], proc, modbase); |
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| 263 | } |
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| 264 | extent += ")"; |
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| 265 | delete[] (char*) children; |
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| 266 | return {return_type.base, extent + return_type.extent}; |
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| 267 | } |
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| 268 | } |
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| 269 | case SymTagEnum::SymTagFunctionArgType: { |
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| 270 | DWORD underlying_type_id = |
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| 271 | get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_TYPEID>(type_index, proc, modbase); |
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| 272 | return {resolve_type(underlying_type_id, proc, modbase), ""}; |
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| 273 | } |
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| 274 | case SymTagEnum::SymTagTypedef: |
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| 275 | case SymTagEnum::SymTagEnum: |
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| 276 | case SymTagEnum::SymTagUDT: |
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| 277 | case SymTagEnum::SymTagBaseClass: |
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| 278 | return { |
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| 279 | get_info_wchar<IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_SYMNAME>(type_index, proc, modbase), "" |
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| 280 | }; |
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| 281 | default: |
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| 282 | return { |
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| 283 | "<unknown type " + |
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| 284 | std::to_string(static_cast<std::underlying_type<SymTagEnum>::type>(tag)) + |
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| 285 | ">", |
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| 286 | "" |
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| 287 | }; |
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| 288 | }; |
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| 289 | } |
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| 290 | |
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| 291 | static std::string resolve_type(ULONG type_index, HANDLE proc, ULONG64 modbase) { |
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| 292 | const auto type = lookup_type(type_index, proc, modbase); |
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| 293 | return type.base + type.extent; |
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| 294 | } |
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| 295 | |
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| 296 | struct function_info { |
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| 297 | HANDLE proc; |
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| 298 | ULONG64 modbase; |
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| 299 | int counter; |
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| 300 | int n_children; |
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| 301 | int n_ignore; |
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| 302 | std::string str; |
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| 303 | }; |
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| 304 | |
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| 305 | // Enumerates function parameters |
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| 306 | static BOOL __stdcall enumerator_callback( |
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| 307 | PSYMBOL_INFO symbol_info, |
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| 308 | ULONG, |
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| 309 | PVOID data |
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| 310 | ) { |
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| 311 | function_info* ctx = (function_info*)data; |
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| 312 | if(ctx->counter++ >= ctx->n_children) { |
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| 313 | return false; |
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| 314 | } |
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| 315 | if(ctx->n_ignore-- > 0) { |
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| 316 | return true; // just skip |
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| 317 | } |
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| 318 | ctx->str += resolve_type(symbol_info->TypeIndex, ctx->proc, ctx->modbase); |
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| 319 | if(ctx->counter < ctx->n_children) { |
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| 320 | ctx->str += ", "; |
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| 321 | } |
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| 322 | return true; |
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| 323 | } |
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| 324 | |
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| 325 | std::mutex dbghelp_lock; |
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| 326 | |
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| 327 | // TODO: Handle backtrace_pcinfo calling the callback multiple times on inlined functions |
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| 328 | stacktrace_frame resolve_frame(HANDLE proc, void* addr) { |
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| 329 | const std::lock_guard<std::mutex> lock(dbghelp_lock); // all dbghelp functions are not thread safe |
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| 330 | alignas(SYMBOL_INFO) char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(TCHAR)]; |
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| 331 | SYMBOL_INFO* symbol = (SYMBOL_INFO*)buffer; |
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| 332 | symbol->SizeOfStruct = sizeof(SYMBOL_INFO); |
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| 333 | symbol->MaxNameLen = MAX_SYM_NAME; |
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| 334 | union { DWORD64 a; DWORD b; } displacement; |
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| 335 | IMAGEHLP_LINE64 line; |
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| 336 | bool got_line = SymGetLineFromAddr64(proc, (DWORD64)addr, &displacement.b, &line); |
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| 337 | if(SymFromAddr(proc, (DWORD64)addr, &displacement.a, symbol)) { |
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| 338 | if(got_line) { |
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| 339 | IMAGEHLP_STACK_FRAME frame; |
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| 340 | frame.InstructionOffset = symbol->Address; |
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| 341 | // https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-symsetcontext |
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| 342 | // "If you call SymSetContext to set the context to its current value, the |
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| 343 | // function fails but GetLastError returns ERROR_SUCCESS." |
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| 344 | // This is the stupidest fucking api I've ever worked with. |
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| 345 | if(SymSetContext(proc, &frame, nullptr) == FALSE && GetLastError() != ERROR_SUCCESS) { |
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| 346 | fprintf(stderr, "Stack trace: Internal error while calling SymSetContext\n"); |
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| 347 | return { |
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| 348 | reinterpret_cast<uintptr_t>(addr), |
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| 349 | static_cast<std::uint_least32_t>(line.LineNumber), |
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| 350 | 0, |
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| 351 | line.FileName, |
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| 352 | symbol->Name |
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| 353 | }; |
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| 354 | } |
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| 355 | DWORD n_children = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_COUNT, true>( |
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| 356 | symbol->TypeIndex, |
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| 357 | proc, |
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| 358 | symbol->ModBase |
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| 359 | ); |
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| 360 | DWORD class_parent_id = get_info<DWORD, IMAGEHLP_SYMBOL_TYPE_INFO::TI_GET_CLASSPARENTID, true>( |
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| 361 | symbol->TypeIndex, |
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| 362 | proc, |
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| 363 | symbol->ModBase |
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| 364 | ); |
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| 365 | function_info fi { |
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| 366 | proc, |
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| 367 | symbol->ModBase, |
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| 368 | 0, |
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| 369 | int(n_children), |
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| 370 | class_parent_id != (DWORD)-1, |
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| 371 | "" |
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| 372 | }; |
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| 373 | SymEnumSymbols(proc, 0, nullptr, enumerator_callback, &fi); |
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| 374 | std::string signature = symbol->Name + std::string("(") + fi.str + ")"; |
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| 375 | // There's a phenomina with DIA not inserting commas after template parameters. Fix them here. |
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| 376 | static std::regex comma_re(R"(,(?=\S))"); |
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| 377 | signature = std::regex_replace(signature, comma_re, ", "); |
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| 378 | return { |
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| 379 | reinterpret_cast<uintptr_t>(addr), |
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| 380 | static_cast<std::uint_least32_t>(line.LineNumber), |
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| 381 | 0, |
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| 382 | line.FileName, |
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| 383 | signature |
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| 384 | }; |
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| 385 | } else { |
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| 386 | return { |
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| 387 | reinterpret_cast<uintptr_t>(addr), |
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| 388 | 0, |
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| 389 | 0, |
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| 390 | "", |
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| 391 | symbol->Name |
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| 392 | }; |
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| 393 | } |
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| 394 | } else { |
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| 395 | return { |
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| 396 | reinterpret_cast<uintptr_t>(addr), |
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| 397 | 0, |
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| 398 | 0, |
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| 399 | "", |
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| 400 | "" |
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| 401 | }; |
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| 402 | } |
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| 403 | } |
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| 404 | |
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| 405 | std::vector<stacktrace_frame> resolve_frames(const std::vector<void*>& frames) { |
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| 406 | std::vector<stacktrace_frame> trace; |
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| 407 | trace.reserve(frames.size()); |
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| 408 | |
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| 409 | // TODO: When does this need to be called? Can it be moved to the symbolizer? |
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| 410 | SymSetOptions(SYMOPT_ALLOW_ABSOLUTE_SYMBOLS); |
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| 411 | HANDLE proc = GetCurrentProcess(); |
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| 412 | if(!SymInitialize(proc, NULL, TRUE)) { |
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| 413 | //TODO? |
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| 414 | throw std::logic_error("SymInitialize failed"); |
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| 415 | } |
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| 416 | for(const auto frame : frames) { |
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| 417 | trace.push_back(resolve_frame(proc, frame)); |
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| 418 | } |
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| 419 | if(!SymCleanup(proc)) { |
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| 420 | //throw std::logic_error("SymCleanup failed"); |
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| 421 | } |
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| 422 | |
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| 423 | return trace; |
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| 424 | } |
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| 425 | } |
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| 426 | } |
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| 427 | } |
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| 428 | |
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| 429 | #endif |
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