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