1 files changed, 121 insertions, 0 deletions
diff --git a/llvm/lib/DebugInfo/PDB/Native/NativeEnumInjectedSources.cpp b/llvm/lib/DebugInfo/PDB/Native/NativeEnumInjectedSources.cpp
new file mode 100644
index 0000000000000..2f6a5bc3d5744
--- /dev/null
+++ b/llvm/lib/DebugInfo/PDB/Native/NativeEnumInjectedSources.cpp
@@ -0,0 +1,121 @@
+//==- NativeEnumInjectedSources.cpp - Native Injected Source Enumerator --*-==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/Native/NativeEnumInjectedSources.h"
+
+#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
+#include "llvm/DebugInfo/PDB/Native/PDBFile.h"
+#include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
+
+namespace llvm {
+namespace pdb {
+
+namespace {
+
+Expected<std::string> readStreamData(BinaryStream &Stream, uint32_t Limit) {
+  uint32_t Offset = 0, DataLength = std::min(Limit, Stream.getLength());
+  std::string Result;
+  Result.reserve(DataLength);
+  while (Offset < DataLength) {
+    ArrayRef<uint8_t> Data;
+    if (auto E = Stream.readLongestContiguousChunk(Offset, Data))
+      return std::move(E);
+    Data = Data.take_front(DataLength - Offset);
+    Offset += Data.size();
+    Result += toStringRef(Data);
+  }
+  return Result;
+}
+
+class NativeInjectedSource final : public IPDBInjectedSource {
+  const SrcHeaderBlockEntry &Entry;
+  const PDBStringTable &Strings;
+  PDBFile &File;
+
+public:
+  NativeInjectedSource(const SrcHeaderBlockEntry &Entry,
+                       PDBFile &File, const PDBStringTable &Strings)
+      : Entry(Entry), Strings(Strings), File(File) {}
+
+  uint32_t getCrc32() const override { return Entry.CRC; }
+  uint64_t getCodeByteSize() const override { return Entry.FileSize; }
+
+  std::string getFileName() const override {
+    StringRef Ret = cantFail(Strings.getStringForID(Entry.FileNI),
+                             "InjectedSourceStream should have rejected this");
+    return Ret;
+  }
+
+  std::string getObjectFileName() const override {
+    StringRef Ret = cantFail(Strings.getStringForID(Entry.ObjNI),
+                             "InjectedSourceStream should have rejected this");
+    return Ret;
+  }
+
+  std::string getVirtualFileName() const override {
+    StringRef Ret = cantFail(Strings.getStringForID(Entry.VFileNI),
+                             "InjectedSourceStream should have rejected this");
+    return Ret;
+  }
+
+  uint32_t getCompression() const override { return Entry.Compression; }
+
+  std::string getCode() const override {
+    // Get name of stream storing the data.
+    StringRef VName =
+        cantFail(Strings.getStringForID(Entry.VFileNI),
+                 "InjectedSourceStream should have rejected this");
+    std::string StreamName = ("/src/files/" + VName).str();
+
+    // Find stream with that name and read its data.
+    // FIXME: Consider validating (or even loading) all this in
+    // InjectedSourceStream so that no error can happen here.
+    auto ExpectedFileStream = File.safelyCreateNamedStream(StreamName);
+    if (!ExpectedFileStream) {
+      consumeError(ExpectedFileStream.takeError());
+      return "(failed to open data stream)";
+    }
+
+    auto Data = readStreamData(**ExpectedFileStream, Entry.FileSize);
+    if (!Data) {
+      consumeError(Data.takeError());
+      return "(failed to read data)";
+    }
+    return *Data;
+  }
+};
+
+} // namespace
+
+NativeEnumInjectedSources::NativeEnumInjectedSources(
+    PDBFile &File, const InjectedSourceStream &IJS,
+    const PDBStringTable &Strings)
+    : File(File), Stream(IJS), Strings(Strings), Cur(Stream.begin()) {}
+
+uint32_t NativeEnumInjectedSources::getChildCount() const {
+  return static_cast<uint32_t>(Stream.size());
+}
+
+std::unique_ptr<IPDBInjectedSource>
+NativeEnumInjectedSources::getChildAtIndex(uint32_t N) const {
+  if (N >= getChildCount())
+    return nullptr;
+  return std::make_unique<NativeInjectedSource>(std::next(Stream.begin(), N)->second,
+                                           File, Strings);
+}
+
+std::unique_ptr<IPDBInjectedSource> NativeEnumInjectedSources::getNext() {
+  if (Cur == Stream.end())
+    return nullptr;
+  return std::make_unique<NativeInjectedSource>((Cur++)->second, File, Strings);
+}
+
+void NativeEnumInjectedSources::reset() { Cur = Stream.begin(); }
+
+}
+}