Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/lib/DebugInfo/PDB/Native/ModuleDebugStream.cpp

@@ -0,0 +1,123 @@
+//===- ModuleDebugStream.cpp - PDB Module Info Stream Access --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/PDB/Native/ModuleDebugStream.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
+#include "llvm/DebugInfo/PDB/Native/RawError.h"
+#include "llvm/Support/BinaryStreamReader.h"
+#include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/Error.h"
+#include <algorithm>
+#include <cstdint>
+
+using namespace llvm;
+using namespace llvm::codeview;
+using namespace llvm::msf;
+using namespace llvm::pdb;
+
+ModuleDebugStreamRef::ModuleDebugStreamRef(
+    const DbiModuleDescriptor &Module,
+    std::unique_ptr<MappedBlockStream> Stream)
+    : Mod(Module), Stream(std::move(Stream)) {}
+
+ModuleDebugStreamRef::~ModuleDebugStreamRef() = default;
+
+Error ModuleDebugStreamRef::reload() {
+  BinaryStreamReader Reader(*Stream);
+
+  uint32_t SymbolSize = Mod.getSymbolDebugInfoByteSize();
+  uint32_t C11Size = Mod.getC11LineInfoByteSize();
+  uint32_t C13Size = Mod.getC13LineInfoByteSize();
+
+  if (C11Size > 0 && C13Size > 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Module has both C11 and C13 line info");
+
+  BinaryStreamRef S;
+
+  if (auto EC = Reader.readInteger(Signature))
+    return EC;
+  if (auto EC = Reader.readSubstream(SymbolsSubstream, SymbolSize - 4))
+    return EC;
+  if (auto EC = Reader.readSubstream(C11LinesSubstream, C11Size))
+    return EC;
+  if (auto EC = Reader.readSubstream(C13LinesSubstream, C13Size))
+    return EC;
+
+  BinaryStreamReader SymbolReader(SymbolsSubstream.StreamData);
+  if (auto EC =
+          SymbolReader.readArray(SymbolArray, SymbolReader.bytesRemaining()))
+    return EC;
+
+  BinaryStreamReader SubsectionsReader(C13LinesSubstream.StreamData);
+  if (auto EC = SubsectionsReader.readArray(Subsections,
+                                            SubsectionsReader.bytesRemaining()))
+    return EC;
+
+  uint32_t GlobalRefsSize;
+  if (auto EC = Reader.readInteger(GlobalRefsSize))
+    return EC;
+  if (auto EC = Reader.readSubstream(GlobalRefsSubstream, GlobalRefsSize))
+    return EC;
+  if (Reader.bytesRemaining() > 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Unexpected bytes in module stream.");
+
+  return Error::success();
+}
+
+BinarySubstreamRef ModuleDebugStreamRef::getSymbolsSubstream() const {
+  return SymbolsSubstream;
+}
+
+BinarySubstreamRef ModuleDebugStreamRef::getC11LinesSubstream() const {
+  return C11LinesSubstream;
+}
+
+BinarySubstreamRef ModuleDebugStreamRef::getC13LinesSubstream() const {
+  return C13LinesSubstream;
+}
+
+BinarySubstreamRef ModuleDebugStreamRef::getGlobalRefsSubstream() const {
+  return GlobalRefsSubstream;
+}
+
+iterator_range<codeview::CVSymbolArray::Iterator>
+ModuleDebugStreamRef::symbols(bool *HadError) const {
+  return make_range(SymbolArray.begin(HadError), SymbolArray.end());
+}
+
+iterator_range<ModuleDebugStreamRef::DebugSubsectionIterator>
+ModuleDebugStreamRef::subsections() const {
+  return make_range(Subsections.begin(), Subsections.end());
+}
+
+bool ModuleDebugStreamRef::hasDebugSubsections() const {
+  return !C13LinesSubstream.empty();
+}
+
+Error ModuleDebugStreamRef::commit() { return Error::success(); }
+
+Expected<codeview::DebugChecksumsSubsectionRef>
+ModuleDebugStreamRef::findChecksumsSubsection() const {
+  codeview::DebugChecksumsSubsectionRef Result;
+  for (const auto &SS : subsections()) {
+    if (SS.kind() != DebugSubsectionKind::FileChecksums)
+      continue;
+
+    if (auto EC = Result.initialize(SS.getRecordData()))
+      return std::move(EC);
+    return Result;
+  }
+  return Result;
+}