Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

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

@@ -1,124 +0,0 @@
-//===- GlobalsStream.cpp - PDB Index of Symbols by Name ---------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// The on-disk structores used in this file are based on the reference
-// implementation which is available at
-// https://github.com/Microsoft/microsoft-pdb/blob/master/PDB/dbi/gsi.h
-//
-// When you are reading the reference source code, you'd find the
-// information below useful.
-//
-//  - ppdb1->m_fMinimalDbgInfo seems to be always true.
-//  - SMALLBUCKETS macro is defined.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/DebugInfo/PDB/Native/GlobalsStream.h"
-#include "llvm/DebugInfo/PDB/Native/RawError.h"
-#include "llvm/Support/BinaryStreamReader.h"
-#include "llvm/Support/Error.h"
-#include <algorithm>
-
-using namespace llvm;
-using namespace llvm::msf;
-using namespace llvm::pdb;
-
-GlobalsStream::GlobalsStream(std::unique_ptr<MappedBlockStream> Stream)
-    : Stream(std::move(Stream)) {}
-
-GlobalsStream::~GlobalsStream() = default;
-
-Error GlobalsStream::reload() {
-  BinaryStreamReader Reader(*Stream);
-  if (auto E = GlobalsTable.read(Reader))
-    return E;
-  return Error::success();
-}
-
-static Error checkHashHdrVersion(const GSIHashHeader *HashHdr) {
-  if (HashHdr->VerHdr != GSIHashHeader::HdrVersion)
-    return make_error<RawError>(
-        raw_error_code::feature_unsupported,
-        "Encountered unsupported globals stream version.");
-
-  return Error::success();
-}
-
-static Error readGSIHashHeader(const GSIHashHeader *&HashHdr,
-                               BinaryStreamReader &Reader) {
-  if (Reader.readObject(HashHdr))
-    return make_error<RawError>(raw_error_code::corrupt_file,
-                                "Stream does not contain a GSIHashHeader.");
-
-  if (HashHdr->VerSignature != GSIHashHeader::HdrSignature)
-    return make_error<RawError>(
-        raw_error_code::feature_unsupported,
-        "GSIHashHeader signature (0xffffffff) not found.");
-
-  return Error::success();
-}
-
-static Error readGSIHashRecords(FixedStreamArray<PSHashRecord> &HashRecords,
-                                const GSIHashHeader *HashHdr,
-                                BinaryStreamReader &Reader) {
-  if (auto EC = checkHashHdrVersion(HashHdr))
-    return EC;
-
-  // HashHdr->HrSize specifies the number of bytes of PSHashRecords we have.
-  // Verify that we can read them all.
-  if (HashHdr->HrSize % sizeof(PSHashRecord))
-    return make_error<RawError>(raw_error_code::corrupt_file,
-                                "Invalid HR array size.");
-  uint32_t NumHashRecords = HashHdr->HrSize / sizeof(PSHashRecord);
-  if (auto EC = Reader.readArray(HashRecords, NumHashRecords))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Error reading hash records."));
-
-  return Error::success();
-}
-
-static Error
-readGSIHashBuckets(FixedStreamArray<support::ulittle32_t> &HashBuckets,
-                   ArrayRef<uint8_t> &HashBitmap, const GSIHashHeader *HashHdr,
-                   BinaryStreamReader &Reader) {
-  if (auto EC = checkHashHdrVersion(HashHdr))
-    return EC;
-
-  // Before the actual hash buckets, there is a bitmap of length determined by
-  // IPHR_HASH.
-  size_t BitmapSizeInBits = alignTo(IPHR_HASH + 1, 32);
-  uint32_t NumBitmapEntries = BitmapSizeInBits / 8;
-  if (auto EC = Reader.readBytes(HashBitmap, NumBitmapEntries))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Could not read a bitmap."));
-  uint32_t NumBuckets = 0;
-  for (uint8_t B : HashBitmap)
-    NumBuckets += countPopulation(B);
-
-  // Hash buckets follow.
-  if (auto EC = Reader.readArray(HashBuckets, NumBuckets))
-    return joinErrors(std::move(EC),
-                      make_error<RawError>(raw_error_code::corrupt_file,
-                                           "Hash buckets corrupted."));
-
-  return Error::success();
-}
-
-Error GSIHashTable::read(BinaryStreamReader &Reader) {
-  if (auto EC = readGSIHashHeader(HashHdr, Reader))
-    return EC;
-  if (auto EC = readGSIHashRecords(HashRecords, HashHdr, Reader))
-    return EC;
-  if (HashHdr->HrSize > 0)
-    if (auto EC = readGSIHashBuckets(HashBuckets, HashBitmap, HashHdr, Reader))
-      return EC;
-  return Error::success();
-}