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