1 //===- DebugSubsectionRecord.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 "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
11 #include "llvm/DebugInfo/CodeView/DebugSubsection.h"
12 
13 #include "llvm/Support/BinaryStreamReader.h"
14 
15 using namespace llvm;
16 using namespace llvm::codeview;
17 
18 DebugSubsectionRecord::DebugSubsectionRecord()
19     : Container(CodeViewContainer::ObjectFile),
20       Kind(DebugSubsectionKind::None) {}
21 
22 DebugSubsectionRecord::DebugSubsectionRecord(DebugSubsectionKind Kind,
23                                              BinaryStreamRef Data,
24                                              CodeViewContainer Container)
25     : Container(Container), Kind(Kind), Data(Data) {}
26 
27 Error DebugSubsectionRecord::initialize(BinaryStreamRef Stream,
28                                         DebugSubsectionRecord &Info,
29                                         CodeViewContainer Container) {
30   const DebugSubsectionHeader *Header;
31   BinaryStreamReader Reader(Stream);
32   if (auto EC = Reader.readObject(Header))
33     return EC;
34 
35   DebugSubsectionKind Kind =
36       static_cast<DebugSubsectionKind>(uint32_t(Header->Kind));
37   switch (Kind) {
38   case DebugSubsectionKind::FileChecksums:
39   case DebugSubsectionKind::Lines:
40   case DebugSubsectionKind::InlineeLines:
41   case DebugSubsectionKind::CrossScopeExports:
42   case DebugSubsectionKind::CrossScopeImports:
43     break;
44   default:
45     llvm_unreachable("Unexpected debug fragment kind!");
46   }
47   if (auto EC = Reader.readStreamRef(Info.Data, Header->Length))
48     return EC;
49   Info.Container = Container;
50   Info.Kind = Kind;
51   return Error::success();
52 }
53 
54 uint32_t DebugSubsectionRecord::getRecordLength() const {
55   uint32_t Result = sizeof(DebugSubsectionHeader) + Data.getLength();
56   assert(Result % alignOf(Container) == 0);
57   return Result;
58 }
59 
60 DebugSubsectionKind DebugSubsectionRecord::kind() const { return Kind; }
61 
62 BinaryStreamRef DebugSubsectionRecord::getRecordData() const { return Data; }
63 
64 DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
65     std::unique_ptr<DebugSubsection> Subsection, CodeViewContainer Container)
66     : Subsection(std::move(Subsection)), Container(Container) {}
67 
68 uint32_t DebugSubsectionRecordBuilder::calculateSerializedLength() {
69   uint32_t Size =
70       sizeof(DebugSubsectionHeader) +
71       alignTo(Subsection->calculateSerializedSize(), alignOf(Container));
72   return Size;
73 }
74 
75 Error DebugSubsectionRecordBuilder::commit(BinaryStreamWriter &Writer) {
76   assert(Writer.getOffset() % alignOf(Container) == 0 &&
77          "Debug Subsection not properly aligned");
78 
79   DebugSubsectionHeader Header;
80   Header.Kind = uint32_t(Subsection->kind());
81   Header.Length = calculateSerializedLength() - sizeof(DebugSubsectionHeader);
82 
83   if (auto EC = Writer.writeObject(Header))
84     return EC;
85   if (auto EC = Subsection->commit(Writer))
86     return EC;
87   if (auto EC = Writer.padToAlignment(alignOf(Container)))
88     return EC;
89 
90   return Error::success();
91 }
92