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// Copyright 2011-2022, Molecular Matters GmbH <[email protected]>
// See LICENSE.txt for licensing details (2-clause BSD License: https://opensource.org/licenses/BSD-2-Clause)
#include "PDB_PCH.h"
#include "PDB_ModuleSymbolStream.h"
#include "PDB_RawFile.h"
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
PDB::ModuleSymbolStream::ModuleSymbolStream(void) PDB_NO_EXCEPT
: m_stream()
{
}
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
PDB::ModuleSymbolStream::ModuleSymbolStream(const RawFile& file, uint16_t streamIndex, uint32_t symbolStreamSize) PDB_NO_EXCEPT
: m_stream(file.CreateMSFStream<CoalescedMSFStream>(streamIndex, symbolStreamSize))
{
// https://llvm.org/docs/PDB/ModiStream.html
// struct ModiStream {
// uint32_t Signature;
// uint8_t Symbols[SymbolSize - 4];
// uint8_t C11LineInfo[C11Size];
// uint8_t C13LineInfo[C13Size];
// uint32_t GlobalRefsSize;
// uint8_t GlobalRefs[GlobalRefsSize];
// };
// we are only interested in the symbols, but not the line information or global refs.
// the coalesced stream is therefore only built for the symbols, not all the data in the stream.
// this potentially saves a lot of memory and performance on large PDBs.
}
// ------------------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------------------
PDB_NO_DISCARD const PDB::CodeView::DBI::Record* PDB::ModuleSymbolStream::FindRecord(CodeView::DBI::SymbolRecordKind kind) const PDB_NO_EXCEPT
{
// ignore the stream's 4-byte signature
size_t offset = sizeof(uint32_t);
// parse the CodeView records
while (offset < m_stream.GetSize())
{
// https://llvm.org/docs/PDB/CodeViewTypes.html
const CodeView::DBI::Record* record = m_stream.GetDataAtOffset<const CodeView::DBI::Record>(offset);
if (record->header.kind == kind)
{
return record;
}
const uint32_t recordSize = GetCodeViewRecordSize(record);
// position the module stream offset at the next record
offset = BitUtil::RoundUpToMultiple<size_t>(offset + sizeof(CodeView::DBI::RecordHeader) + recordSize, 4u);
}
return nullptr;
}
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