127 lines
4.1 KiB
C++
127 lines
4.1 KiB
C++
//===-- DWARFDebugRanges.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 "DWARFDebugRanges.h"
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#include "DWARFUnit.h"
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#include "lldb/Utility/Stream.h"
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using namespace lldb_private;
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static dw_addr_t GetBaseAddressMarker(uint32_t addr_size) {
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switch(addr_size) {
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case 2:
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return 0xffff;
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case 4:
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return 0xffffffff;
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case 8:
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return 0xffffffffffffffff;
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}
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llvm_unreachable("GetBaseAddressMarker unsupported address size.");
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}
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DWARFDebugRanges::DWARFDebugRanges() : m_range_map() {}
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void DWARFDebugRanges::Extract(DWARFContext &context) {
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DWARFRangeList range_list;
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lldb::offset_t offset = 0;
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dw_offset_t debug_ranges_offset = offset;
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while (Extract(context, &offset, range_list)) {
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range_list.Sort();
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m_range_map[debug_ranges_offset] = range_list;
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debug_ranges_offset = offset;
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}
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}
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bool DWARFDebugRanges::Extract(DWARFContext &context,
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lldb::offset_t *offset_ptr,
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DWARFRangeList &range_list) {
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range_list.Clear();
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lldb::offset_t range_offset = *offset_ptr;
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const DWARFDataExtractor &debug_ranges_data = context.getOrLoadRangesData();
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uint32_t addr_size = debug_ranges_data.GetAddressByteSize();
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dw_addr_t base_addr = 0;
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dw_addr_t base_addr_marker = GetBaseAddressMarker(addr_size);
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while (
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debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size)) {
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dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
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dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
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if (!begin && !end) {
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// End of range list
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break;
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}
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if (begin == base_addr_marker) {
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base_addr = end;
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continue;
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}
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// Filter out empty ranges
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if (begin < end)
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range_list.Append(DWARFRangeList::Entry(begin + base_addr, end - begin));
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}
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// Make sure we consumed at least something
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return range_offset != *offset_ptr;
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}
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void DWARFDebugRanges::Dump(Stream &s,
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const DWARFDataExtractor &debug_ranges_data,
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lldb::offset_t *offset_ptr,
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dw_addr_t cu_base_addr) {
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uint32_t addr_size = s.GetAddressByteSize();
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dw_addr_t base_addr = cu_base_addr;
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while (
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debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size)) {
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dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
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dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
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// Extend 4 byte addresses that consists of 32 bits of 1's to be 64 bits of
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// ones
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if (begin == 0xFFFFFFFFull && addr_size == 4)
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begin = LLDB_INVALID_ADDRESS;
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s.Indent();
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if (begin == 0 && end == 0) {
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s.PutCString(" End");
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break;
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} else if (begin == LLDB_INVALID_ADDRESS) {
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// A base address selection entry
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base_addr = end;
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DumpAddress(s.AsRawOstream(), base_addr, sizeof(dw_addr_t),
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" Base address = ");
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} else {
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// Convert from offset to an address
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dw_addr_t begin_addr = begin + base_addr;
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dw_addr_t end_addr = end + base_addr;
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DumpAddressRange(s.AsRawOstream(), begin_addr, end_addr,
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sizeof(dw_addr_t), nullptr);
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}
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}
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}
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bool DWARFDebugRanges::FindRanges(const DWARFUnit *cu,
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dw_offset_t debug_ranges_offset,
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DWARFRangeList &range_list) const {
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dw_addr_t debug_ranges_address = cu->GetRangesBase() + debug_ranges_offset;
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range_map_const_iterator pos = m_range_map.find(debug_ranges_address);
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if (pos != m_range_map.end()) {
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range_list = pos->second;
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// All DW_AT_ranges are relative to the base address of the compile
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// unit. We add the compile unit base address to make sure all the
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// addresses are properly fixed up.
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range_list.Slide(cu->GetBaseAddress());
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return true;
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}
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return false;
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}
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