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1 //===-- DWARFDebugRangesList.cpp ------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
11 #include "llvm/Support/Format.h"
12 #include "llvm/Support/raw_ostream.h"
13 
14 using namespace llvm;
15 
clear()16 void DWARFDebugRangeList::clear() {
17   Offset = -1U;
18   AddressSize = 0;
19   Entries.clear();
20 }
21 
extract(DataExtractor data,uint32_t * offset_ptr)22 bool DWARFDebugRangeList::extract(DataExtractor data, uint32_t *offset_ptr) {
23   clear();
24   if (!data.isValidOffset(*offset_ptr))
25     return false;
26   AddressSize = data.getAddressSize();
27   if (AddressSize != 4 && AddressSize != 8)
28     return false;
29   Offset = *offset_ptr;
30   while (true) {
31     RangeListEntry entry;
32     uint32_t prev_offset = *offset_ptr;
33     entry.StartAddress = data.getAddress(offset_ptr);
34     entry.EndAddress = data.getAddress(offset_ptr);
35     // Check that both values were extracted correctly.
36     if (*offset_ptr != prev_offset + 2 * AddressSize) {
37       clear();
38       return false;
39     }
40     if (entry.isEndOfListEntry())
41       break;
42     Entries.push_back(entry);
43   }
44   return true;
45 }
46 
dump(raw_ostream & OS) const47 void DWARFDebugRangeList::dump(raw_ostream &OS) const {
48   for (const RangeListEntry &RLE : Entries) {
49     const char *format_str = (AddressSize == 4
50                               ? "%08x %08"  PRIx64 " %08"  PRIx64 "\n"
51                               : "%08x %016" PRIx64 " %016" PRIx64 "\n");
52     OS << format(format_str, Offset, RLE.StartAddress, RLE.EndAddress);
53   }
54   OS << format("%08x <End of list>\n", Offset);
55 }
56 
57 DWARFAddressRangesVector
getAbsoluteRanges(uint64_t BaseAddress) const58 DWARFDebugRangeList::getAbsoluteRanges(uint64_t BaseAddress) const {
59   DWARFAddressRangesVector Res;
60   for (const RangeListEntry &RLE : Entries) {
61     if (RLE.isBaseAddressSelectionEntry(AddressSize)) {
62       BaseAddress = RLE.EndAddress;
63     } else {
64       Res.push_back(std::make_pair(BaseAddress + RLE.StartAddress,
65                                    BaseAddress + RLE.EndAddress));
66     }
67   }
68   return Res;
69 }
70