2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
//===-- DWARFDebugMacro.cpp -------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DWARFDebugMacro.h"
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#include "SymbolFileDWARF.h"
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#include "lldb/Symbol/DebugMacros.h"
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#include "DWARFDataExtractor.h"
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using namespace lldb_private;
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DWARFDebugMacroHeader
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DWARFDebugMacroHeader::ParseHeader(const DWARFDataExtractor &debug_macro_data,
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lldb::offset_t *offset) {
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DWARFDebugMacroHeader header;
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// Skip over the version field in header.
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header.m_version = debug_macro_data.GetU16(offset);
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uint8_t flags = debug_macro_data.GetU8(offset);
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header.m_offset_is_64_bit = (flags & OFFSET_SIZE_MASK) != 0;
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if (flags & DEBUG_LINE_OFFSET_MASK) {
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if (header.m_offset_is_64_bit)
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header.m_debug_line_offset = debug_macro_data.GetU64(offset);
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else
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header.m_debug_line_offset = debug_macro_data.GetU32(offset);
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}
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// Skip over the operands table if it is present.
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if (flags & OPCODE_OPERANDS_TABLE_MASK)
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SkipOperandTable(debug_macro_data, offset);
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return header;
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}
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void DWARFDebugMacroHeader::SkipOperandTable(
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const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset) {
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uint8_t entry_count = debug_macro_data.GetU8(offset);
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for (uint8_t i = 0; i < entry_count; i++) {
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// Skip over the opcode number.
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debug_macro_data.GetU8(offset);
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uint64_t operand_count = debug_macro_data.GetULEB128(offset);
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for (uint64_t j = 0; j < operand_count; j++) {
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// Skip over the operand form
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debug_macro_data.GetU8(offset);
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}
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}
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}
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void DWARFDebugMacroEntry::ReadMacroEntries(
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const DWARFDataExtractor &debug_macro_data,
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const DWARFDataExtractor &debug_str_data, const bool offset_is_64_bit,
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lldb::offset_t *offset, SymbolFileDWARF *sym_file_dwarf,
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DebugMacrosSP &debug_macros_sp) {
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llvm::dwarf::MacroEntryType type =
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static_cast<llvm::dwarf::MacroEntryType>(debug_macro_data.GetU8(offset));
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while (type != 0) {
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lldb::offset_t new_offset = 0, str_offset = 0;
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uint32_t line = 0;
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const char *macro_str = nullptr;
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uint32_t debug_line_file_idx = 0;
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switch (type) {
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case DW_MACRO_define:
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case DW_MACRO_undef:
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line = debug_macro_data.GetULEB128(offset);
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macro_str = debug_macro_data.GetCStr(offset);
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if (type == DW_MACRO_define)
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debug_macros_sp->AddMacroEntry(
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DebugMacroEntry::CreateDefineEntry(line, macro_str));
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else
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debug_macros_sp->AddMacroEntry(
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DebugMacroEntry::CreateUndefEntry(line, macro_str));
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break;
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case DW_MACRO_define_strp:
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case DW_MACRO_undef_strp:
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line = debug_macro_data.GetULEB128(offset);
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if (offset_is_64_bit)
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str_offset = debug_macro_data.GetU64(offset);
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else
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str_offset = debug_macro_data.GetU32(offset);
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macro_str = debug_str_data.GetCStr(&str_offset);
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if (type == DW_MACRO_define_strp)
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debug_macros_sp->AddMacroEntry(
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DebugMacroEntry::CreateDefineEntry(line, macro_str));
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else
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debug_macros_sp->AddMacroEntry(
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DebugMacroEntry::CreateUndefEntry(line, macro_str));
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break;
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case DW_MACRO_start_file:
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line = debug_macro_data.GetULEB128(offset);
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debug_line_file_idx = debug_macro_data.GetULEB128(offset);
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debug_macros_sp->AddMacroEntry(
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DebugMacroEntry::CreateStartFileEntry(line, debug_line_file_idx));
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break;
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case DW_MACRO_end_file:
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// This operation has no operands.
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debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateEndFileEntry());
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break;
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case DW_MACRO_import:
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if (offset_is_64_bit)
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new_offset = debug_macro_data.GetU64(offset);
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else
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new_offset = debug_macro_data.GetU32(offset);
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debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateIndirectEntry(
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sym_file_dwarf->ParseDebugMacros(&new_offset)));
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break;
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default:
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// TODO: Add support for other standard operations.
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// TODO: Provide mechanism to hook handling of non-standard/extension
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// operands.
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return;
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}
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type = static_cast<llvm::dwarf::MacroEntryType>(
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debug_macro_data.GetU8(offset));
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}
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}
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