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
Dump(Stream * s) const20 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
BuildAddressRangeTable(DWARFDebugAranges * debug_aranges)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
GetNonSkeletonUnit()103 DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() {
104 return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit());
105 }
106
LookupAddress(const dw_addr_t address)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