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126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
//===-- DWARFDebugRanges.cpp ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DWARFDebugRanges.h"
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#include "SymbolFileDWARF.h"
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#include "lldb/Utility/Stream.h"
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#include <assert.h>
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using namespace lldb_private;
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using namespace std;
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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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DWARFDebugRanges::~DWARFDebugRanges() {}
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void DWARFDebugRanges::Extract(SymbolFileDWARF *dwarf2Data) {
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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(dwarf2Data, &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(SymbolFileDWARF *dwarf2Data,
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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 =
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dwarf2Data->get_debug_ranges_data();
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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
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// of 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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s.Address(base_addr, sizeof(dw_addr_t), " 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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s.AddressRange(begin_addr, end_addr, sizeof(dw_addr_t), NULL);
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}
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}
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}
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bool DWARFDebugRanges::FindRanges(dw_addr_t debug_ranges_base,
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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 = debug_ranges_base + 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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return true;
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}
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return false;
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}
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