1 //===-- DWARFDebugRanges.cpp ------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "DWARFDebugRanges.h"
11 #include "SymbolFileDWARF.h"
12 #include "lldb/Utility/Stream.h"
15 using namespace lldb_private;
18 static dw_addr_t GetBaseAddressMarker(uint32_t addr_size) {
25 return 0xffffffffffffffff;
27 llvm_unreachable("GetBaseAddressMarker unsupported address size.");
30 DWARFDebugRanges::DWARFDebugRanges() : m_range_map() {}
32 DWARFDebugRanges::~DWARFDebugRanges() {}
34 void DWARFDebugRanges::Extract(SymbolFileDWARF *dwarf2Data) {
35 DWARFRangeList range_list;
36 lldb::offset_t offset = 0;
37 dw_offset_t debug_ranges_offset = offset;
38 while (Extract(dwarf2Data, &offset, range_list)) {
40 m_range_map[debug_ranges_offset] = range_list;
41 debug_ranges_offset = offset;
45 bool DWARFDebugRanges::Extract(SymbolFileDWARF *dwarf2Data,
46 lldb::offset_t *offset_ptr,
47 DWARFRangeList &range_list) {
50 lldb::offset_t range_offset = *offset_ptr;
51 const DWARFDataExtractor &debug_ranges_data =
52 dwarf2Data->get_debug_ranges_data();
53 uint32_t addr_size = debug_ranges_data.GetAddressByteSize();
54 dw_addr_t base_addr = 0;
55 dw_addr_t base_addr_marker = GetBaseAddressMarker(addr_size);
58 debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size)) {
59 dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
60 dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
67 if (begin == base_addr_marker) {
72 // Filter out empty ranges
74 range_list.Append(DWARFRangeList::Entry(begin + base_addr, end - begin));
77 // Make sure we consumed at least something
78 return range_offset != *offset_ptr;
81 void DWARFDebugRanges::Dump(Stream &s,
82 const DWARFDataExtractor &debug_ranges_data,
83 lldb::offset_t *offset_ptr,
84 dw_addr_t cu_base_addr) {
85 uint32_t addr_size = s.GetAddressByteSize();
87 dw_addr_t base_addr = cu_base_addr;
89 debug_ranges_data.ValidOffsetForDataOfSize(*offset_ptr, 2 * addr_size)) {
90 dw_addr_t begin = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
91 dw_addr_t end = debug_ranges_data.GetMaxU64(offset_ptr, addr_size);
92 // Extend 4 byte addresses that consists of 32 bits of 1's to be 64 bits of
94 if (begin == 0xFFFFFFFFull && addr_size == 4)
95 begin = LLDB_INVALID_ADDRESS;
98 if (begin == 0 && end == 0) {
101 } else if (begin == LLDB_INVALID_ADDRESS) {
102 // A base address selection entry
104 s.Address(base_addr, sizeof(dw_addr_t), " Base address = ");
106 // Convert from offset to an address
107 dw_addr_t begin_addr = begin + base_addr;
108 dw_addr_t end_addr = end + base_addr;
110 s.AddressRange(begin_addr, end_addr, sizeof(dw_addr_t), NULL);
115 bool DWARFDebugRanges::FindRanges(dw_addr_t debug_ranges_base,
116 dw_offset_t debug_ranges_offset,
117 DWARFRangeList &range_list) const {
118 dw_addr_t debug_ranges_address = debug_ranges_base + debug_ranges_offset;
119 range_map_const_iterator pos = m_range_map.find(debug_ranges_address);
120 if (pos != m_range_map.end()) {
121 range_list = pos->second;