forked from OSchip/llvm-project
116 lines
4.6 KiB
C++
116 lines
4.6 KiB
C++
//===-- DWARFCompileUnit.cpp ----------------------------------------------===//
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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 "DWARFCompileUnit.h"
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#include "DWARFDebugAranges.h"
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#include "SymbolFileDWARFDebugMap.h"
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#include "lldb/Symbol/CompileUnit.h"
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#include "lldb/Symbol/LineTable.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb;
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using namespace lldb_private;
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void DWARFCompileUnit::Dump(Stream *s) const {
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s->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, "
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"abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at "
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"{0x%8.8x})\n",
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GetOffset(), GetLength(), GetVersion(), GetAbbrevOffset(),
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GetAddressByteSize(), GetNextUnitOffset());
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}
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void DWARFCompileUnit::BuildAddressRangeTable(
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DWARFDebugAranges *debug_aranges) {
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// This function is usually called if there in no .debug_aranges section in
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// order to produce a compile unit level set of address ranges that is
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// accurate.
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size_t num_debug_aranges = debug_aranges->GetNumRanges();
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// First get the compile unit DIE only and check if it has a DW_AT_ranges
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const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
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const dw_offset_t cu_offset = GetOffset();
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if (die) {
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DWARFRangeList ranges;
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const size_t num_ranges =
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die->GetAttributeAddressRanges(this, ranges, false);
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if (num_ranges > 0) {
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// This compile unit has DW_AT_ranges, assume this is correct if it is
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// present since clang no longer makes .debug_aranges by default and it
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// emits DW_AT_ranges for DW_TAG_compile_units. GCC also does this with
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// recent GCC builds.
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for (size_t i = 0; i < num_ranges; ++i) {
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const DWARFRangeList::Entry &range = ranges.GetEntryRef(i);
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debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
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range.GetRangeEnd());
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}
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return; // We got all of our ranges from the DW_AT_ranges attribute
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}
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}
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// We don't have a DW_AT_ranges attribute, so we need to parse the DWARF
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// If the DIEs weren't parsed, then we don't want all dies for all compile
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// units to stay loaded when they weren't needed. So we can end up parsing
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// the DWARF and then throwing them all away to keep memory usage down.
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ScopedExtractDIEs clear_dies(ExtractDIEsScoped());
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die = DIEPtr();
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if (die)
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die->BuildAddressRangeTable(this, debug_aranges);
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if (debug_aranges->GetNumRanges() == num_debug_aranges) {
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// We got nothing from the functions, maybe we have a line tables only
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// situation. Check the line tables and build the arange table from this.
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SymbolContext sc;
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sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this);
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if (sc.comp_unit) {
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SymbolFileDWARFDebugMap *debug_map_sym_file =
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m_dwarf.GetDebugMapSymfile();
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if (debug_map_sym_file == nullptr) {
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if (LineTable *line_table = sc.comp_unit->GetLineTable()) {
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LineTable::FileAddressRanges file_ranges;
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const bool append = true;
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const size_t num_ranges =
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line_table->GetContiguousFileAddressRanges(file_ranges, append);
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for (uint32_t idx = 0; idx < num_ranges; ++idx) {
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const LineTable::FileAddressRanges::Entry &range =
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file_ranges.GetEntryRef(idx);
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debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
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range.GetRangeEnd());
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}
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}
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} else
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debug_map_sym_file->AddOSOARanges(&m_dwarf, debug_aranges);
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}
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}
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if (debug_aranges->GetNumRanges() == num_debug_aranges) {
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// We got nothing from the functions, maybe we have a line tables only
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// situation. Check the line tables and build the arange table from this.
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SymbolContext sc;
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sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this);
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if (sc.comp_unit) {
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if (LineTable *line_table = sc.comp_unit->GetLineTable()) {
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LineTable::FileAddressRanges file_ranges;
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const bool append = true;
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const size_t num_ranges =
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line_table->GetContiguousFileAddressRanges(file_ranges, append);
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for (uint32_t idx = 0; idx < num_ranges; ++idx) {
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const LineTable::FileAddressRanges::Entry &range =
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file_ranges.GetEntryRef(idx);
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debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(),
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range.GetRangeEnd());
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}
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}
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}
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}
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}
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