1 //===-- DWARFCompileUnit.cpp ------------------------------------*- C++ -*-===//
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 "DWARFCompileUnit.h"
11
12 #include "SymbolFileDWARF.h"
13 #include "lldb/Utility/Stream.h"
14
15 using namespace lldb;
16 using namespace lldb_private;
17
18 extern int g_verbose;
19
DWARFCompileUnit(SymbolFileDWARF * dwarf2Data)20 DWARFCompileUnit::DWARFCompileUnit(SymbolFileDWARF *dwarf2Data)
21 : DWARFUnit(dwarf2Data) {}
22
Extract(SymbolFileDWARF * dwarf2Data,const DWARFDataExtractor & debug_info,lldb::offset_t * offset_ptr)23 DWARFUnitSP DWARFCompileUnit::Extract(SymbolFileDWARF *dwarf2Data,
24 const DWARFDataExtractor &debug_info,
25 lldb::offset_t *offset_ptr) {
26 // std::make_shared would require the ctor to be public.
27 std::shared_ptr<DWARFCompileUnit> cu_sp(new DWARFCompileUnit(dwarf2Data));
28
29 cu_sp->m_offset = *offset_ptr;
30
31 if (debug_info.ValidOffset(*offset_ptr)) {
32 dw_offset_t abbr_offset;
33 const DWARFDebugAbbrev *abbr = dwarf2Data->DebugAbbrev();
34 cu_sp->m_length = debug_info.GetDWARFInitialLength(offset_ptr);
35 cu_sp->m_is_dwarf64 = debug_info.IsDWARF64();
36 cu_sp->m_version = debug_info.GetU16(offset_ptr);
37
38 if (cu_sp->m_version == 5) {
39 cu_sp->m_unit_type = debug_info.GetU8(offset_ptr);
40 cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
41 abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
42
43 if (cu_sp->m_unit_type == llvm::dwarf::DW_UT_skeleton)
44 cu_sp->m_dwo_id = debug_info.GetU64(offset_ptr);
45 } else {
46 abbr_offset = debug_info.GetDWARFOffset(offset_ptr);
47 cu_sp->m_addr_size = debug_info.GetU8(offset_ptr);
48 }
49
50 bool length_OK =
51 debug_info.ValidOffset(cu_sp->GetNextCompileUnitOffset() - 1);
52 bool version_OK = SymbolFileDWARF::SupportedVersion(cu_sp->m_version);
53 bool abbr_offset_OK =
54 dwarf2Data->get_debug_abbrev_data().ValidOffset(abbr_offset);
55 bool addr_size_OK = (cu_sp->m_addr_size == 4) || (cu_sp->m_addr_size == 8);
56
57 if (length_OK && version_OK && addr_size_OK && abbr_offset_OK &&
58 abbr != NULL) {
59 cu_sp->m_abbrevs = abbr->GetAbbreviationDeclarationSet(abbr_offset);
60 return cu_sp;
61 }
62
63 // reset the offset to where we tried to parse from if anything went wrong
64 *offset_ptr = cu_sp->m_offset;
65 }
66
67 return nullptr;
68 }
69
Dump(Stream * s) const70 void DWARFCompileUnit::Dump(Stream *s) const {
71 s->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, "
72 "abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at "
73 "{0x%8.8x})\n",
74 m_offset, m_length, m_version, GetAbbrevOffset(), m_addr_size,
75 GetNextCompileUnitOffset());
76 }
77
GetHeaderByteSize() const78 uint32_t DWARFCompileUnit::GetHeaderByteSize() const {
79 if (m_version < 5)
80 return m_is_dwarf64 ? 23 : 11;
81
82 switch (m_unit_type) {
83 case llvm::dwarf::DW_UT_compile:
84 case llvm::dwarf::DW_UT_partial:
85 return 12;
86 case llvm::dwarf::DW_UT_skeleton:
87 case llvm::dwarf::DW_UT_split_compile:
88 return 20;
89 case llvm::dwarf::DW_UT_type:
90 case llvm::dwarf::DW_UT_split_type:
91 return 24;
92 }
93 llvm_unreachable("invalid UnitType.");
94 }
95
GetData() const96 const lldb_private::DWARFDataExtractor &DWARFCompileUnit::GetData() const {
97 return m_dwarf->get_debug_info_data();
98 }
99