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//===-- DWARFDebugInfo.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 "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 "llvm/Support/Casting.h"
#include "DWARFCompileUnit.h"
#include "DWARFContext.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "DWARFDebugInfoEntry.h"
#include "DWARFFormValue.h"
#include "DWARFTypeUnit.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::plugin::dwarf;
// Constructor
DWARFDebugInfo::DWARFDebugInfo(SymbolFileDWARF &dwarf, DWARFContext &context)
: m_dwarf(dwarf), m_context(context), m_units(), m_cu_aranges_up() {}
const DWARFDebugAranges &DWARFDebugInfo::GetCompileUnitAranges() {
if (m_cu_aranges_up)
return *m_cu_aranges_up;
m_cu_aranges_up = std::make_unique<DWARFDebugAranges>();
const DWARFDataExtractor &debug_aranges_data =
m_context.getOrLoadArangesData();
// Extract what we can from the .debug_aranges first.
m_cu_aranges_up->extract(debug_aranges_data);
// Make a list of all CUs represented by the .debug_aranges data.
std::set<dw_offset_t> cus_with_data;
for (size_t n = 0; n < m_cu_aranges_up->GetNumRanges(); n++) {
dw_offset_t offset = m_cu_aranges_up->OffsetAtIndex(n);
if (offset != DW_INVALID_OFFSET)
cus_with_data.insert(offset);
}
// Manually build arange data for everything that wasn't in .debug_aranges.
// The .debug_aranges accelerator is not guaranteed to be complete.
// Tools such as dsymutil can provide stronger guarantees than required by the
// standard. Without that guarantee, we have to iterate over every CU in the
// .debug_info and make sure there's a corresponding entry in the table and if
// not, add one for every subprogram.
ObjectFile *OF = m_dwarf.GetObjectFile();
if (!OF || !OF->CanTrustAddressRanges()) {
const size_t num_units = GetNumUnits();
for (size_t idx = 0; idx < num_units; ++idx) {
DWARFUnit *cu = GetUnitAtIndex(idx);
dw_offset_t offset = cu->GetOffset();
if (cus_with_data.find(offset) == cus_with_data.end())
cu->BuildAddressRangeTable(m_cu_aranges_up.get());
}
}
const bool minimize = true;
m_cu_aranges_up->Sort(minimize);
return *m_cu_aranges_up;
}
void DWARFDebugInfo::ParseUnitsFor(DIERef::Section section) {
DWARFDataExtractor data = section == DIERef::Section::DebugTypes
? m_context.getOrLoadDebugTypesData()
: m_context.getOrLoadDebugInfoData();
lldb::offset_t offset = 0;
while (data.ValidOffset(offset)) {
llvm::Expected<DWARFUnitSP> unit_sp = DWARFUnit::extract(
m_dwarf, m_units.size(), data, section, &offset);
if (!unit_sp) {
// FIXME: Propagate this error up.
llvm::consumeError(unit_sp.takeError());
return;
}
// If it didn't return an error, then it should be returning a valid Unit.
assert(*unit_sp);
m_units.push_back(*unit_sp);
offset = (*unit_sp)->GetNextUnitOffset();
if (auto *type_unit = llvm::dyn_cast<DWARFTypeUnit>(unit_sp->get())) {
m_type_hash_to_unit_index.emplace_back(type_unit->GetTypeHash(),
unit_sp.get()->GetID());
}
}
}
void DWARFDebugInfo::ParseUnitHeadersIfNeeded() {
llvm::call_once(m_units_once_flag, [&] {
ParseUnitsFor(DIERef::Section::DebugInfo);
ParseUnitsFor(DIERef::Section::DebugTypes);
llvm::sort(m_type_hash_to_unit_index, llvm::less_first());
});
}
size_t DWARFDebugInfo::GetNumUnits() {
ParseUnitHeadersIfNeeded();
return m_units.size();
}
DWARFUnit *DWARFDebugInfo::GetUnitAtIndex(size_t idx) {
DWARFUnit *cu = nullptr;
if (idx < GetNumUnits())
cu = m_units[idx].get();
return cu;
}
uint32_t DWARFDebugInfo::FindUnitIndex(DIERef::Section section,
dw_offset_t offset) {
ParseUnitHeadersIfNeeded();
// llvm::lower_bound is not used as for DIE offsets it would still return
// index +1 and GetOffset() returning index itself would be a special case.
auto pos = llvm::upper_bound(
m_units, std::make_pair(section, offset),
[](const std::pair<DIERef::Section, dw_offset_t> &lhs,
const DWARFUnitSP &rhs) {
return lhs < std::make_pair(rhs->GetDebugSection(), rhs->GetOffset());
});
uint32_t idx = std::distance(m_units.begin(), pos);
if (idx == 0)
return DW_INVALID_INDEX;
return idx - 1;
}
DWARFUnit *DWARFDebugInfo::GetUnitAtOffset(DIERef::Section section,
dw_offset_t cu_offset,
uint32_t *idx_ptr) {
uint32_t idx = FindUnitIndex(section, cu_offset);
DWARFUnit *result = GetUnitAtIndex(idx);
if (result && result->GetOffset() != cu_offset) {
result = nullptr;
idx = DW_INVALID_INDEX;
}
if (idx_ptr)
*idx_ptr = idx;
return result;
}
DWARFUnit *DWARFDebugInfo::GetUnit(const DIERef &die_ref) {
return GetUnitContainingDIEOffset(die_ref.section(), die_ref.die_offset());
}
DWARFUnit *
DWARFDebugInfo::GetUnitContainingDIEOffset(DIERef::Section section,
dw_offset_t die_offset) {
uint32_t idx = FindUnitIndex(section, die_offset);
DWARFUnit *result = GetUnitAtIndex(idx);
if (result && !result->ContainsDIEOffset(die_offset))
return nullptr;
return result;
}
DWARFTypeUnit *DWARFDebugInfo::GetTypeUnitForHash(uint64_t hash) {
auto pos = llvm::lower_bound(m_type_hash_to_unit_index,
std::make_pair(hash, 0u), llvm::less_first());
if (pos == m_type_hash_to_unit_index.end() || pos->first != hash)
return nullptr;
return llvm::cast<DWARFTypeUnit>(GetUnitAtIndex(pos->second));
}
bool DWARFDebugInfo::ContainsTypeUnits() {
ParseUnitHeadersIfNeeded();
return !m_type_hash_to_unit_index.empty();
}
// GetDIE()
//
// Get the DIE (Debug Information Entry) with the specified offset.
DWARFDIE
DWARFDebugInfo::GetDIE(const DIERef &die_ref) {
DWARFUnit *cu = GetUnit(die_ref);
if (cu)
return cu->GetNonSkeletonUnit().GetDIE(die_ref.die_offset());
return DWARFDIE(); // Not found
}
llvm::StringRef DWARFDebugInfo::PeekDIEName(const DIERef &die_ref) {
if (DWARFUnit *cu = GetUnit(die_ref))
return cu->GetNonSkeletonUnit().PeekDIEName(die_ref.die_offset());
return llvm::StringRef();
}
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