129 lines · cpp
1//===-- DWARFDebugMacro.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-exception6//7//===----------------------------------------------------------------------===//8 9#include "DWARFDebugMacro.h"10#include "SymbolFileDWARF.h"11 12#include "lldb/Symbol/DebugMacros.h"13 14#include "DWARFDataExtractor.h"15 16using namespace lldb_private;17using namespace lldb_private::plugin::dwarf;18using namespace llvm::dwarf;19 20DWARFDebugMacroHeader21DWARFDebugMacroHeader::ParseHeader(const DWARFDataExtractor &debug_macro_data,22 lldb::offset_t *offset) {23 DWARFDebugMacroHeader header;24 25 // Skip over the version field in header.26 header.m_version = debug_macro_data.GetU16(offset);27 28 uint8_t flags = debug_macro_data.GetU8(offset);29 header.m_offset_is_64_bit = (flags & OFFSET_SIZE_MASK) != 0;30 31 if (flags & DEBUG_LINE_OFFSET_MASK) {32 if (header.m_offset_is_64_bit)33 header.m_debug_line_offset = debug_macro_data.GetU64(offset);34 else35 header.m_debug_line_offset = debug_macro_data.GetU32(offset);36 }37 38 // Skip over the operands table if it is present.39 if (flags & OPCODE_OPERANDS_TABLE_MASK)40 SkipOperandTable(debug_macro_data, offset);41 42 return header;43}44 45void DWARFDebugMacroHeader::SkipOperandTable(46 const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset) {47 uint8_t entry_count = debug_macro_data.GetU8(offset);48 for (uint8_t i = 0; i < entry_count; i++) {49 // Skip over the opcode number.50 debug_macro_data.GetU8(offset);51 52 uint64_t operand_count = debug_macro_data.GetULEB128(offset);53 54 for (uint64_t j = 0; j < operand_count; j++) {55 // Skip over the operand form56 debug_macro_data.GetU8(offset);57 }58 }59}60 61void DWARFDebugMacroEntry::ReadMacroEntries(62 const DWARFDataExtractor &debug_macro_data,63 const DWARFDataExtractor &debug_str_data, const bool offset_is_64_bit,64 lldb::offset_t *offset, SymbolFileDWARF *sym_file_dwarf,65 DebugMacrosSP &debug_macros_sp) {66 llvm::dwarf::MacroEntryType type =67 static_cast<llvm::dwarf::MacroEntryType>(debug_macro_data.GetU8(offset));68 while (type != 0) {69 lldb::offset_t new_offset = 0, str_offset = 0;70 uint32_t line = 0;71 const char *macro_str = nullptr;72 uint32_t debug_line_file_idx = 0;73 74 switch (type) {75 case DW_MACRO_define:76 case DW_MACRO_undef:77 line = debug_macro_data.GetULEB128(offset);78 macro_str = debug_macro_data.GetCStr(offset);79 if (type == DW_MACRO_define)80 debug_macros_sp->AddMacroEntry(81 DebugMacroEntry::CreateDefineEntry(line, macro_str));82 else83 debug_macros_sp->AddMacroEntry(84 DebugMacroEntry::CreateUndefEntry(line, macro_str));85 break;86 case DW_MACRO_define_strp:87 case DW_MACRO_undef_strp:88 line = debug_macro_data.GetULEB128(offset);89 if (offset_is_64_bit)90 str_offset = debug_macro_data.GetU64(offset);91 else92 str_offset = debug_macro_data.GetU32(offset);93 macro_str = debug_str_data.GetCStr(&str_offset);94 if (type == DW_MACRO_define_strp)95 debug_macros_sp->AddMacroEntry(96 DebugMacroEntry::CreateDefineEntry(line, macro_str));97 else98 debug_macros_sp->AddMacroEntry(99 DebugMacroEntry::CreateUndefEntry(line, macro_str));100 break;101 case DW_MACRO_start_file:102 line = debug_macro_data.GetULEB128(offset);103 debug_line_file_idx = debug_macro_data.GetULEB128(offset);104 debug_macros_sp->AddMacroEntry(105 DebugMacroEntry::CreateStartFileEntry(line, debug_line_file_idx));106 break;107 case DW_MACRO_end_file:108 // This operation has no operands.109 debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateEndFileEntry());110 break;111 case DW_MACRO_import:112 if (offset_is_64_bit)113 new_offset = debug_macro_data.GetU64(offset);114 else115 new_offset = debug_macro_data.GetU32(offset);116 debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateIndirectEntry(117 sym_file_dwarf->ParseDebugMacros(&new_offset)));118 break;119 default:120 // TODO: Add support for other standard operations.121 // TODO: Provide mechanism to hook handling of non-standard/extension122 // operands.123 return;124 }125 type = static_cast<llvm::dwarf::MacroEntryType>(126 debug_macro_data.GetU8(offset));127 }128}129