1 //===-- DWARFCompileUnit.cpp ----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "DWARFCompileUnit.h"
10 #include "DWARFDebugAranges.h"
11 #include "SymbolFileDWARFDebugMap.h"
12 
13 #include "lldb/Symbol/CompileUnit.h"
14 #include "lldb/Symbol/LineTable.h"
15 #include "lldb/Utility/Stream.h"
16 
17 using namespace lldb;
18 using namespace lldb_private;
19 
20 void DWARFCompileUnit::Dump(Stream *s) const {
21   s->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, "
22             "abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at "
23             "{0x%8.8x})\n",
24             GetOffset(), GetLength(), GetVersion(), GetAbbrevOffset(),
25             GetAddressByteSize(), GetNextUnitOffset());
26 }
27 
28 void DWARFCompileUnit::BuildAddressRangeTable(
29     DWARFDebugAranges *debug_aranges) {
30   // This function is usually called if there in no .debug_aranges section in
31   // order to produce a compile unit level set of address ranges that is
32   // accurate.
33 
34   size_t num_debug_aranges = debug_aranges->GetNumRanges();
35 
36   // First get the compile unit DIE only and check contains ranges information.
37   const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
38 
39   const dw_offset_t cu_offset = GetOffset();
40   if (die) {
41     DWARFRangeList ranges;
42     const size_t num_ranges =
43         die->GetAttributeAddressRanges(this, ranges, /*check_hi_lo_pc=*/true);
44     if (num_ranges > 0) {
45       for (size_t i = 0; i < num_ranges; ++i) {
46         const DWARFRangeList::Entry &range = ranges.GetEntryRef(i);
47         debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
48                                    range.GetRangeEnd());
49       }
50 
51       return;
52     }
53   }
54 
55   if (debug_aranges->GetNumRanges() == num_debug_aranges) {
56     // We got nothing from the debug info, maybe we have a line tables only
57     // situation. Check the line tables and build the arange table from this.
58     SymbolContext sc;
59     sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this);
60     if (sc.comp_unit) {
61       SymbolFileDWARFDebugMap *debug_map_sym_file =
62           m_dwarf.GetDebugMapSymfile();
63       if (debug_map_sym_file == nullptr) {
64         if (LineTable *line_table = sc.comp_unit->GetLineTable()) {
65           LineTable::FileAddressRanges file_ranges;
66           const bool append = true;
67           const size_t num_ranges =
68               line_table->GetContiguousFileAddressRanges(file_ranges, append);
69           for (uint32_t idx = 0; idx < num_ranges; ++idx) {
70             const LineTable::FileAddressRanges::Entry &range =
71                 file_ranges.GetEntryRef(idx);
72             debug_aranges->AppendRange(cu_offset, range.GetRangeBase(),
73                                        range.GetRangeEnd());
74           }
75         }
76       } else
77         debug_map_sym_file->AddOSOARanges(&m_dwarf, debug_aranges);
78     }
79   }
80 
81   if (debug_aranges->GetNumRanges() == num_debug_aranges) {
82     // We got nothing from the functions, maybe we have a line tables only
83     // situation. Check the line tables and build the arange table from this.
84     SymbolContext sc;
85     sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this);
86     if (sc.comp_unit) {
87       if (LineTable *line_table = sc.comp_unit->GetLineTable()) {
88         LineTable::FileAddressRanges file_ranges;
89         const bool append = true;
90         const size_t num_ranges =
91             line_table->GetContiguousFileAddressRanges(file_ranges, append);
92         for (uint32_t idx = 0; idx < num_ranges; ++idx) {
93           const LineTable::FileAddressRanges::Entry &range =
94               file_ranges.GetEntryRef(idx);
95           debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(),
96                                      range.GetRangeEnd());
97         }
98       }
99     }
100   }
101 }
102 
103 DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() {
104   return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit());
105 }
106 
107 DWARFDIE DWARFCompileUnit::LookupAddress(const dw_addr_t address) {
108   if (DIE()) {
109     const DWARFDebugAranges &func_aranges = GetFunctionAranges();
110 
111     // Re-check the aranges auto pointer contents in case it was created above
112     if (!func_aranges.IsEmpty())
113       return GetDIE(func_aranges.FindAddress(address));
114   }
115   return DWARFDIE();
116 }
117