llvm/lib/DebugInfo/CodeView/DebugSubsectionVisitor.cpp

//===- DebugSubsectionVisitor.cpp -------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/DebugInfo/CodeView/DebugSubsectionVisitor.h"

#include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugCrossExSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugCrossImpSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugFrameDataSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugInlineeLinesSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugLinesSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugSubsectionRecord.h"
#include "llvm/DebugInfo/CodeView/DebugSymbolsSubsection.h"
#include "llvm/DebugInfo/CodeView/DebugUnknownSubsection.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamRef.h"

using namespace llvm;
using namespace llvm::codeview;

DebugSubsectionState::DebugSubsectionState() {}

DebugSubsectionState::DebugSubsectionState(
    const DebugStringTableSubsectionRef &Strings)
    : Strings(&Strings) {}

DebugSubsectionState::DebugSubsectionState(
    const DebugStringTableSubsectionRef &Strings,
    const DebugChecksumsSubsectionRef &Checksums)
    : Strings(&Strings), Checksums(&Checksums) {}

void DebugSubsectionState::initializeStrings(const DebugSubsectionRecord &SR) {
  assert(SR.kind() == DebugSubsectionKind::StringTable);
  assert(!Strings && "Found a string table even though we already have one!");

  OwnedStrings = llvm::make_unique<DebugStringTableSubsectionRef>();
  consumeError(OwnedStrings->initialize(SR.getRecordData()));
  Strings = OwnedStrings.get();
}

void DebugSubsectionState::initializeChecksums(
    const DebugSubsectionRecord &FCR) {
  assert(FCR.kind() == DebugSubsectionKind::FileChecksums);
  if (Checksums)
    return;

  OwnedChecksums = llvm::make_unique<DebugChecksumsSubsectionRef>();
  consumeError(OwnedChecksums->initialize(FCR.getRecordData()));
  Checksums = OwnedChecksums.get();
}

Error llvm::codeview::visitDebugSubsection(const DebugSubsectionRecord &R,
                                           DebugSubsectionVisitor &V,
                                           const DebugSubsectionState &State) {
  BinaryStreamReader Reader(R.getRecordData());
  switch (R.kind()) {
  case DebugSubsectionKind::Lines: {
    DebugLinesSubsectionRef Fragment;
    if (auto EC = Fragment.initialize(Reader))
      return EC;

    return V.visitLines(Fragment, State);
  }
  case DebugSubsectionKind::FileChecksums: {
    DebugChecksumsSubsectionRef Fragment;
    if (auto EC = Fragment.initialize(Reader))
      return EC;

    return V.visitFileChecksums(Fragment, State);
  }
  case DebugSubsectionKind::InlineeLines: {
    DebugInlineeLinesSubsectionRef Fragment;
    if (auto EC = Fragment.initialize(Reader))
      return EC;
    return V.visitInlineeLines(Fragment, State);
  }
  case DebugSubsectionKind::CrossScopeExports: {
    DebugCrossModuleExportsSubsectionRef Section;
    if (auto EC = Section.initialize(Reader))
      return EC;
    return V.visitCrossModuleExports(Section, State);
  }
  case DebugSubsectionKind::CrossScopeImports: {
    DebugCrossModuleImportsSubsectionRef Section;
    if (auto EC = Section.initialize(Reader))
      return EC;
    return V.visitCrossModuleImports(Section, State);
  }
  case DebugSubsectionKind::Symbols: {
    DebugSymbolsSubsectionRef Section;
    if (auto EC = Section.initialize(Reader))
      return EC;
    return V.visitSymbols(Section, State);
  }
  case DebugSubsectionKind::StringTable: {
    DebugStringTableSubsectionRef Section;
    if (auto EC = Section.initialize(Reader))
      return EC;
    return V.visitStringTable(Section, State);
  }
  case DebugSubsectionKind::FrameData: {
    DebugFrameDataSubsectionRef Section;
    if (auto EC = Section.initialize(Reader))
      return EC;
    return V.visitFrameData(Section, State);
  }
  default: {
    DebugUnknownSubsectionRef Fragment(R.kind(), R.getRecordData());
    return V.visitUnknown(Fragment);
  }
  }
}