1//===- DebugCrossImpSubsection.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 "llvm/DebugInfo/CodeView/DebugCrossImpSubsection.h"
10#include "llvm/ADT/ArrayRef.h"
11#include "llvm/DebugInfo/CodeView/CodeViewError.h"
12#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
13#include "llvm/Support/BinaryStreamReader.h"
14#include "llvm/Support/BinaryStreamWriter.h"
15#include "llvm/Support/Endian.h"
16#include "llvm/Support/Error.h"
17#include <algorithm>
18#include <cstdint>
19#include <utility>
20#include <vector>
21
22using namespace llvm;
23using namespace llvm::codeview;
24
25Error VarStreamArrayExtractor<CrossModuleImportItem>::
26operator()(BinaryStreamRef Stream, uint32_t &Len,
27 codeview::CrossModuleImportItem &Item) {
28 BinaryStreamReader Reader(Stream);
29 if (Reader.bytesRemaining() < sizeof(CrossModuleImport))
30 return make_error<CodeViewError>(
31 Args: cv_error_code::insufficient_buffer,
32 Args: "Not enough bytes for a Cross Module Import Header!");
33 if (auto EC = Reader.readObject(Dest&: Item.Header))
34 return EC;
35 if (Reader.bytesRemaining() < Item.Header->Count * sizeof(uint32_t))
36 return make_error<CodeViewError>(
37 Args: cv_error_code::insufficient_buffer,
38 Args: "Not enough to read specified number of Cross Module References!");
39 if (auto EC = Reader.readArray(Array&: Item.Imports, NumItems: Item.Header->Count))
40 return EC;
41 return Error::success();
42}
43
44Error DebugCrossModuleImportsSubsectionRef::initialize(
45 BinaryStreamReader Reader) {
46 return Reader.readArray(Array&: References, Size: Reader.bytesRemaining());
47}
48
49Error DebugCrossModuleImportsSubsectionRef::initialize(BinaryStreamRef Stream) {
50 BinaryStreamReader Reader(Stream);
51 return initialize(Reader);
52}
53
54void DebugCrossModuleImportsSubsection::addImport(StringRef Module,
55 uint32_t ImportId) {
56 Strings.insert(S: Module);
57 std::vector<support::ulittle32_t> Targets = {support::ulittle32_t(ImportId)};
58 auto Result = Mappings.insert(KV: std::make_pair(x&: Module, y&: Targets));
59 if (!Result.second)
60 Result.first->getValue().push_back(x: Targets[0]);
61}
62
63uint32_t DebugCrossModuleImportsSubsection::calculateSerializedSize() const {
64 uint32_t Size = 0;
65 for (const auto &Item : Mappings) {
66 Size += sizeof(CrossModuleImport);
67 Size += sizeof(support::ulittle32_t) * Item.second.size();
68 }
69 return Size;
70}
71
72Error DebugCrossModuleImportsSubsection::commit(
73 BinaryStreamWriter &Writer) const {
74 using T = decltype(&*Mappings.begin());
75 std::vector<T> Ids;
76 Ids.reserve(n: Mappings.size());
77
78 for (const auto &M : Mappings)
79 Ids.push_back(x: &M);
80
81 llvm::sort(C&: Ids, Comp: [this](const T &L1, const T &L2) {
82 return Strings.getIdForString(S: L1->getKey()) <
83 Strings.getIdForString(S: L2->getKey());
84 });
85
86 for (const auto &Item : Ids) {
87 CrossModuleImport Imp;
88 Imp.ModuleNameOffset = Strings.getIdForString(S: Item->getKey());
89 Imp.Count = Item->getValue().size();
90 if (auto EC = Writer.writeObject(Obj: Imp))
91 return EC;
92 if (auto EC = Writer.writeArray(Array: ArrayRef(Item->getValue())))
93 return EC;
94 }
95 return Error::success();
96}
97