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//===-- DWARFDebugMacro.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugMacro.h"
#include "SymbolFileDWARF.h"
#include "lldb/Symbol/DebugMacros.h"
#include "DWARFDataExtractor.h"
using namespace lldb_private;
using namespace lldb_private::dwarf;
DWARFDebugMacroHeader
DWARFDebugMacroHeader::ParseHeader(const DWARFDataExtractor &debug_macro_data,
lldb::offset_t *offset) {
DWARFDebugMacroHeader header;
// Skip over the version field in header.
header.m_version = debug_macro_data.GetU16(offset);
uint8_t flags = debug_macro_data.GetU8(offset);
header.m_offset_is_64_bit = (flags & OFFSET_SIZE_MASK) != 0;
if (flags & DEBUG_LINE_OFFSET_MASK) {
if (header.m_offset_is_64_bit)
header.m_debug_line_offset = debug_macro_data.GetU64(offset);
else
header.m_debug_line_offset = debug_macro_data.GetU32(offset);
}
// Skip over the operands table if it is present.
if (flags & OPCODE_OPERANDS_TABLE_MASK)
SkipOperandTable(debug_macro_data, offset);
return header;
}
void DWARFDebugMacroHeader::SkipOperandTable(
const DWARFDataExtractor &debug_macro_data, lldb::offset_t *offset) {
uint8_t entry_count = debug_macro_data.GetU8(offset);
for (uint8_t i = 0; i < entry_count; i++) {
// Skip over the opcode number.
debug_macro_data.GetU8(offset);
uint64_t operand_count = debug_macro_data.GetULEB128(offset);
for (uint64_t j = 0; j < operand_count; j++) {
// Skip over the operand form
debug_macro_data.GetU8(offset);
}
}
}
void DWARFDebugMacroEntry::ReadMacroEntries(
const DWARFDataExtractor &debug_macro_data,
const DWARFDataExtractor &debug_str_data, const bool offset_is_64_bit,
lldb::offset_t *offset, SymbolFileDWARF *sym_file_dwarf,
DebugMacrosSP &debug_macros_sp) {
llvm::dwarf::MacroEntryType type =
static_cast<llvm::dwarf::MacroEntryType>(debug_macro_data.GetU8(offset));
while (type != 0) {
lldb::offset_t new_offset = 0, str_offset = 0;
uint32_t line = 0;
const char *macro_str = nullptr;
uint32_t debug_line_file_idx = 0;
switch (type) {
case DW_MACRO_define:
case DW_MACRO_undef:
line = debug_macro_data.GetULEB128(offset);
macro_str = debug_macro_data.GetCStr(offset);
if (type == DW_MACRO_define)
debug_macros_sp->AddMacroEntry(
DebugMacroEntry::CreateDefineEntry(line, macro_str));
else
debug_macros_sp->AddMacroEntry(
DebugMacroEntry::CreateUndefEntry(line, macro_str));
break;
case DW_MACRO_define_strp:
case DW_MACRO_undef_strp:
line = debug_macro_data.GetULEB128(offset);
if (offset_is_64_bit)
str_offset = debug_macro_data.GetU64(offset);
else
str_offset = debug_macro_data.GetU32(offset);
macro_str = debug_str_data.GetCStr(&str_offset);
if (type == DW_MACRO_define_strp)
debug_macros_sp->AddMacroEntry(
DebugMacroEntry::CreateDefineEntry(line, macro_str));
else
debug_macros_sp->AddMacroEntry(
DebugMacroEntry::CreateUndefEntry(line, macro_str));
break;
case DW_MACRO_start_file:
line = debug_macro_data.GetULEB128(offset);
debug_line_file_idx = debug_macro_data.GetULEB128(offset);
debug_macros_sp->AddMacroEntry(
DebugMacroEntry::CreateStartFileEntry(line, debug_line_file_idx));
break;
case DW_MACRO_end_file:
// This operation has no operands.
debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateEndFileEntry());
break;
case DW_MACRO_import:
if (offset_is_64_bit)
new_offset = debug_macro_data.GetU64(offset);
else
new_offset = debug_macro_data.GetU32(offset);
debug_macros_sp->AddMacroEntry(DebugMacroEntry::CreateIndirectEntry(
sym_file_dwarf->ParseDebugMacros(&new_offset)));
break;
default:
// TODO: Add support for other standard operations.
// TODO: Provide mechanism to hook handling of non-standard/extension
// operands.
return;
}
type = static_cast<llvm::dwarf::MacroEntryType>(
debug_macro_data.GetU8(offset));
}
}
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