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//===-- DWARFDebugInfo.cpp --------------------------------------*- C++ -*-===//
//
// 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 "SymbolFileDWARF.h"
#include <algorithm>
#include <set>
#include "lldb/Host/PosixApi.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/RegularExpression.h"
#include "lldb/Utility/Stream.h"
#include "DWARFCompileUnit.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "DWARFDebugInfoEntry.h"
#include "DWARFFormValue.h"
#include "LogChannelDWARF.h"
using namespace lldb;
using namespace lldb_private;
using namespace std;
//----------------------------------------------------------------------
// Constructor
//----------------------------------------------------------------------
DWARFDebugInfo::DWARFDebugInfo()
: m_dwarf2Data(NULL), m_compile_units(), m_cu_aranges_ap() {}
//----------------------------------------------------------------------
// SetDwarfData
//----------------------------------------------------------------------
void DWARFDebugInfo::SetDwarfData(SymbolFileDWARF *dwarf2Data) {
m_dwarf2Data = dwarf2Data;
m_compile_units.clear();
}
DWARFDebugAranges &DWARFDebugInfo::GetCompileUnitAranges() {
if (m_cu_aranges_ap.get() == NULL && m_dwarf2Data) {
Log *log(LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_ARANGES));
m_cu_aranges_ap.reset(new DWARFDebugAranges());
const DWARFDataExtractor &debug_aranges_data =
m_dwarf2Data->get_debug_aranges_data();
if (debug_aranges_data.GetByteSize() > 0) {
if (log)
log->Printf(
"DWARFDebugInfo::GetCompileUnitAranges() for \"%s\" from "
".debug_aranges",
m_dwarf2Data->GetObjectFile()->GetFileSpec().GetPath().c_str());
m_cu_aranges_ap->Extract(debug_aranges_data);
}
// Make a list of all CUs represented by the arange data in the file.
std::set<dw_offset_t> cus_with_data;
for (size_t n = 0; n < m_cu_aranges_ap.get()->GetNumRanges(); n++) {
dw_offset_t offset = m_cu_aranges_ap.get()->OffsetAtIndex(n);
if (offset != DW_INVALID_OFFSET)
cus_with_data.insert(offset);
}
// Manually build arange data for everything that wasn't in the
// .debug_aranges table.
bool printed = false;
const size_t num_compile_units = GetNumCompileUnits();
for (size_t idx = 0; idx < num_compile_units; ++idx) {
DWARFUnit *cu = GetCompileUnitAtIndex(idx);
dw_offset_t offset = cu->GetOffset();
if (cus_with_data.find(offset) == cus_with_data.end()) {
if (log) {
if (!printed)
log->Printf(
"DWARFDebugInfo::GetCompileUnitAranges() for \"%s\" by parsing",
m_dwarf2Data->GetObjectFile()->GetFileSpec().GetPath().c_str());
printed = true;
}
cu->BuildAddressRangeTable(m_dwarf2Data, m_cu_aranges_ap.get());
}
}
const bool minimize = true;
m_cu_aranges_ap->Sort(minimize);
}
return *m_cu_aranges_ap.get();
}
void DWARFDebugInfo::ParseCompileUnitHeadersIfNeeded() {
if (m_compile_units.empty()) {
if (m_dwarf2Data != NULL) {
lldb::offset_t offset = 0;
DWARFUnitSP cu_sp;
const auto &debug_info_data = m_dwarf2Data->get_debug_info_data();
while ((cu_sp = DWARFCompileUnit::Extract(m_dwarf2Data, debug_info_data,
&offset))) {
m_compile_units.push_back(cu_sp);
offset = cu_sp->GetNextCompileUnitOffset();
}
}
}
}
size_t DWARFDebugInfo::GetNumCompileUnits() {
ParseCompileUnitHeadersIfNeeded();
return m_compile_units.size();
}
DWARFUnit *DWARFDebugInfo::GetCompileUnitAtIndex(uint32_t idx) {
DWARFUnit *cu = NULL;
if (idx < GetNumCompileUnits())
cu = m_compile_units[idx].get();
return cu;
}
bool DWARFDebugInfo::ContainsCompileUnit(const DWARFUnit *cu) const {
// Not a verify efficient function, but it is handy for use in assertions to
// make sure that a compile unit comes from a debug information file.
CompileUnitColl::const_iterator end_pos = m_compile_units.end();
CompileUnitColl::const_iterator pos;
for (pos = m_compile_units.begin(); pos != end_pos; ++pos) {
if (pos->get() == cu)
return true;
}
return false;
}
bool DWARFDebugInfo::OffsetLessThanCompileUnitOffset(
dw_offset_t offset, const DWARFUnitSP &cu_sp) {
return offset < cu_sp->GetOffset();
}
DWARFUnit *DWARFDebugInfo::GetCompileUnit(dw_offset_t cu_offset,
uint32_t *idx_ptr) {
DWARFUnitSP cu_sp;
uint32_t cu_idx = DW_INVALID_INDEX;
if (cu_offset != DW_INVALID_OFFSET) {
ParseCompileUnitHeadersIfNeeded();
// Watch out for single compile unit executable as they are pretty common
const size_t num_cus = m_compile_units.size();
if (num_cus == 1) {
if (m_compile_units[0]->GetOffset() == cu_offset) {
cu_sp = m_compile_units[0];
cu_idx = 0;
}
} else if (num_cus) {
CompileUnitColl::const_iterator end_pos = m_compile_units.end();
CompileUnitColl::const_iterator begin_pos = m_compile_units.begin();
CompileUnitColl::const_iterator pos = std::upper_bound(
begin_pos, end_pos, cu_offset, OffsetLessThanCompileUnitOffset);
if (pos != begin_pos) {
--pos;
if ((*pos)->GetOffset() == cu_offset) {
cu_sp = *pos;
cu_idx = std::distance(begin_pos, pos);
}
}
}
}
if (idx_ptr)
*idx_ptr = cu_idx;
return cu_sp.get();
}
DWARFUnit *DWARFDebugInfo::GetCompileUnit(const DIERef &die_ref) {
if (die_ref.cu_offset == DW_INVALID_OFFSET)
return GetCompileUnitContainingDIEOffset(die_ref.die_offset);
else
return GetCompileUnit(die_ref.cu_offset);
}
DWARFUnit *
DWARFDebugInfo::GetCompileUnitContainingDIEOffset(dw_offset_t die_offset) {
ParseCompileUnitHeadersIfNeeded();
DWARFUnitSP cu_sp;
// Watch out for single compile unit executable as they are pretty common
const size_t num_cus = m_compile_units.size();
if (num_cus == 1) {
if (m_compile_units[0]->ContainsDIEOffset(die_offset))
return m_compile_units[0].get();
} else if (num_cus) {
CompileUnitColl::const_iterator end_pos = m_compile_units.end();
CompileUnitColl::const_iterator begin_pos = m_compile_units.begin();
CompileUnitColl::const_iterator pos = std::upper_bound(
begin_pos, end_pos, die_offset, OffsetLessThanCompileUnitOffset);
if (pos != begin_pos) {
--pos;
if ((*pos)->ContainsDIEOffset(die_offset))
return (*pos).get();
}
}
return nullptr;
}
DWARFDIE
DWARFDebugInfo::GetDIEForDIEOffset(dw_offset_t die_offset) {
DWARFUnit *cu = GetCompileUnitContainingDIEOffset(die_offset);
if (cu)
return cu->GetDIE(die_offset);
return DWARFDIE();
}
//----------------------------------------------------------------------
// GetDIE()
//
// Get the DIE (Debug Information Entry) with the specified offset.
//----------------------------------------------------------------------
DWARFDIE
DWARFDebugInfo::GetDIE(const DIERef &die_ref) {
DWARFUnit *cu = GetCompileUnit(die_ref);
if (cu)
return cu->GetDIE(die_ref.die_offset);
return DWARFDIE(); // Not found
}
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