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//===-- DWARFDebugAranges.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 "DWARFDebugAranges.h"
#include <assert.h>
#include <stdio.h>
#include <algorithm>
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/Timer.h"
#include "DWARFUnit.h"
#include "DWARFDebugInfo.h"
#include "LogChannelDWARF.h"
#include "SymbolFileDWARF.h"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// Constructor
//----------------------------------------------------------------------
DWARFDebugAranges::DWARFDebugAranges() : m_aranges() {}
//----------------------------------------------------------------------
// CountArangeDescriptors
//----------------------------------------------------------------------
class CountArangeDescriptors {
public:
CountArangeDescriptors(uint32_t &count_ref) : count(count_ref) {
// printf("constructor CountArangeDescriptors()\n");
}
void operator()(const DWARFDebugArangeSet &set) {
count += set.NumDescriptors();
}
uint32_t &count;
};
//----------------------------------------------------------------------
// Extract
//----------------------------------------------------------------------
bool DWARFDebugAranges::Extract(const DWARFDataExtractor &debug_aranges_data) {
if (debug_aranges_data.ValidOffset(0)) {
lldb::offset_t offset = 0;
DWARFDebugArangeSet set;
Range range;
while (set.Extract(debug_aranges_data, &offset)) {
const uint32_t num_descriptors = set.NumDescriptors();
if (num_descriptors > 0) {
const dw_offset_t cu_offset = set.GetCompileUnitDIEOffset();
for (uint32_t i = 0; i < num_descriptors; ++i) {
const DWARFDebugArangeSet::Descriptor &descriptor =
set.GetDescriptorRef(i);
m_aranges.Append(RangeToDIE::Entry(descriptor.address,
descriptor.length, cu_offset));
}
}
set.Clear();
}
}
return false;
}
//----------------------------------------------------------------------
// Generate
//----------------------------------------------------------------------
bool DWARFDebugAranges::Generate(SymbolFileDWARF *dwarf2Data) {
Clear();
DWARFDebugInfo *debug_info = dwarf2Data->DebugInfo();
if (debug_info) {
uint32_t cu_idx = 0;
const uint32_t num_compile_units = dwarf2Data->GetNumCompileUnits();
for (cu_idx = 0; cu_idx < num_compile_units; ++cu_idx) {
DWARFUnit *cu = debug_info->GetCompileUnitAtIndex(cu_idx);
if (cu)
cu->BuildAddressRangeTable(dwarf2Data, this);
}
}
return !IsEmpty();
}
void DWARFDebugAranges::Dump(Log *log) const {
if (log == NULL)
return;
const size_t num_entries = m_aranges.GetSize();
for (size_t i = 0; i < num_entries; ++i) {
const RangeToDIE::Entry *entry = m_aranges.GetEntryAtIndex(i);
if (entry)
log->Printf("0x%8.8x: [0x%" PRIx64 " - 0x%" PRIx64 ")", entry->data,
entry->GetRangeBase(), entry->GetRangeEnd());
}
}
void DWARFDebugAranges::AppendRange(dw_offset_t offset, dw_addr_t low_pc,
dw_addr_t high_pc) {
if (high_pc > low_pc)
m_aranges.Append(RangeToDIE::Entry(low_pc, high_pc - low_pc, offset));
}
void DWARFDebugAranges::Sort(bool minimize) {
static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
Timer scoped_timer(func_cat, "%s this = %p", LLVM_PRETTY_FUNCTION,
static_cast<void *>(this));
Log *log(LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_ARANGES));
size_t orig_arange_size = 0;
if (log) {
orig_arange_size = m_aranges.GetSize();
log->Printf("DWARFDebugAranges::Sort(minimize = %u) with %" PRIu64
" entries",
minimize, (uint64_t)orig_arange_size);
}
m_aranges.Sort();
m_aranges.CombineConsecutiveEntriesWithEqualData();
if (log) {
if (minimize) {
const size_t new_arange_size = m_aranges.GetSize();
const size_t delta = orig_arange_size - new_arange_size;
log->Printf("DWARFDebugAranges::Sort() %" PRIu64
" entries after minimizing (%" PRIu64
" entries combined for %" PRIu64 " bytes saved)",
(uint64_t)new_arange_size, (uint64_t)delta,
(uint64_t)delta * sizeof(Range));
}
Dump(log);
}
}
//----------------------------------------------------------------------
// FindAddress
//----------------------------------------------------------------------
dw_offset_t DWARFDebugAranges::FindAddress(dw_addr_t address) const {
const RangeToDIE::Entry *entry = m_aranges.FindEntryThatContains(address);
if (entry)
return entry->data;
return DW_INVALID_OFFSET;
}
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