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//===- GSI.cpp - Common Functions for GlobalsStream and PublicsStream ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "GSI.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/DebugInfo/PDB/Native/RawTypes.h"
#include "llvm/Support/BinaryStreamArray.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/Error.h"
namespace llvm {
namespace pdb {
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();
}
Error readGSIHashBuckets(FixedStreamArray<support::ulittle32_t> &HashBuckets,
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.
ArrayRef<uint8_t> Bitmap;
size_t BitmapSizeInBits = alignTo(IPHR_HASH + 1, 32);
uint32_t NumBitmapEntries = BitmapSizeInBits / 8;
if (auto EC = Reader.readBytes(Bitmap, 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 : Bitmap)
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 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();
}
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();
}
}
}
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