109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
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//===-- 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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using namespace lldb_private::plugin::dwarf;
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void DWARFCompileUnit::Dump(Stream *s) const {
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s->Format(
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"{0:x16}: Compile Unit: length = {1:x8}, version = {2:x}, "
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"abbr_offset = {3:x8}, addr_size = {4:x2} (next CU at "
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"[{5:x16}])\n",
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GetOffset(), GetLength(), GetVersion(), (uint32_t)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 contains ranges information.
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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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die->GetAttributeAddressRanges(this, /*check_hi_lo_pc=*/true);
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for (const DWARFRangeList::Entry &range : ranges)
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debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
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range.GetRangeEnd());
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if (!ranges.IsEmpty())
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return;
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}
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if (debug_aranges->GetNumRanges() == num_debug_aranges) {
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// We got nothing from the debug info, try to build the arange table from
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// the debug map OSO aranges.
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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) {
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auto *cu_info =
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debug_map_sym_file->GetCompileUnitInfo(&GetSymbolFileDWARF());
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// If there are extra compile units the OSO entries aren't a reliable
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// source of information.
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if (cu_info->compile_units_sps.empty())
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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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}
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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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DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() {
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return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit());
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}
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DWARFDIE DWARFCompileUnit::LookupAddress(const dw_addr_t address) {
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if (DIE()) {
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const DWARFDebugAranges &func_aranges = GetFunctionAranges();
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// Re-check the aranges auto pointer contents in case it was created above
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if (!func_aranges.IsEmpty())
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return GetDIE(func_aranges.FindAddress(address));
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}
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return DWARFDIE();
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}
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