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     break;
42   default:
43     llvm_unreachable("Unexpected debug fragment kind!");
44   }
45   if (auto EC = Reader.readStreamRef(Info.Data, Header->Length))
46     return EC;
47   Info.Container = Container;
48   Info.Kind = Kind;
49   return Error::success();
50 }
51 
52 uint32_t DebugSubsectionRecord::getRecordLength() const {
53   uint32_t Result = sizeof(DebugSubsectionHeader) + Data.getLength();
54   assert(Result % alignOf(Container) == 0);
55   return Result;
56 }
57 
58 DebugSubsectionKind DebugSubsectionRecord::kind() const { return Kind; }
59 
60 BinaryStreamRef DebugSubsectionRecord::getRecordData() const { return Data; }
61 
62 DebugSubsectionRecordBuilder::DebugSubsectionRecordBuilder(
63     DebugSubsectionKind Kind, DebugSubsection &Frag,
64     CodeViewContainer Container)
65     : Container(Container), Kind(Kind), Frag(Frag) {}
66 
67 uint32_t DebugSubsectionRecordBuilder::calculateSerializedLength() {
68   uint32_t Size = sizeof(DebugSubsectionHeader) +
69                   alignTo(Frag.calculateSerializedSize(), alignOf(Container));
70   return Size;
71 }
72 
73 Error DebugSubsectionRecordBuilder::commit(BinaryStreamWriter &Writer) {
74   assert(Writer.getOffset() % alignOf(Container) == 0 &&
75          "Debug Subsection not properly aligned");
76 
77   DebugSubsectionHeader Header;
78   Header.Kind = uint32_t(Kind);
79   Header.Length = calculateSerializedLength() - sizeof(DebugSubsectionHeader);
80 
81   if (auto EC = Writer.writeObject(Header))
82     return EC;
83   if (auto EC = Frag.commit(Writer))
84     return EC;
85   if (auto EC = Writer.padToAlignment(alignOf(Container)))
86     return EC;
87 
88   return Error::success();
89 }
90