llvm/lib/DebugInfo/CodeView/DebugCrossImpSubsection.cpp

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