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//===-- PdbSymUid.h ---------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// A unique identification scheme for Pdb records.
// The scheme is to partition a 64-bit integer into an 8-bit tag field, which
// will contain some value from the PDB_SymType enumeration. The format of the
// other 48-bits depend on the tag, but must be sufficient to locate the
// corresponding entry in the underlying PDB file quickly. For example, for
// a compile unit, we use 2 bytes to represent the index, which allows fast
// access to the compile unit's information.
//===----------------------------------------------------------------------===//
#ifndef LLDB_PLUGINS_SYMBOLFILENATIVEPDB_PDBSYMUID_H
#define LLDB_PLUGINS_SYMBOLFILENATIVEPDB_PDBSYMUID_H
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/DebugInfo/PDB/PDBTypes.h"
#include "llvm/Support/Compiler.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/lldb-types.h"
namespace lldb_private {
namespace npdb {
enum class PdbSymUidKind : uint8_t {
Compiland,
CompilandSym,
PublicSym,
GlobalSym,
Type,
FieldListMember
};
struct PdbCompilandId {
// 0-based index of module in PDB
uint16_t modi;
};
struct PdbCompilandSymId {
PdbCompilandSymId() = default;
PdbCompilandSymId(uint16_t modi, uint32_t offset)
: modi(modi), offset(offset) {}
// 0-based index of module in PDB
uint16_t modi = 0;
// Offset of symbol's record in module stream. This is
// offset by 4 from the CVSymbolArray's notion of offset
// due to the debug magic at the beginning of the stream.
uint32_t offset = 0;
};
struct PdbGlobalSymId {
PdbGlobalSymId() = default;
PdbGlobalSymId(uint32_t offset, bool is_public)
: offset(offset), is_public(is_public) {}
// Offset of symbol's record in globals or publics stream.
uint32_t offset = 0;
// True if this symbol is in the public stream, false if it's in the globals
// stream.
bool is_public = false;
};
struct PdbTypeSymId {
PdbTypeSymId() = default;
PdbTypeSymId(llvm::codeview::TypeIndex index, bool is_ipi = false)
: index(index), is_ipi(is_ipi) {}
// The index of the of the type in the TPI or IPI stream.
llvm::codeview::TypeIndex index;
// True if this symbol comes from the IPI stream, false if it's from the TPI
// stream.
bool is_ipi = false;
};
struct PdbFieldListMemberId {
// The TypeIndex of the LF_FIELDLIST record.
llvm::codeview::TypeIndex index;
// The offset from the beginning of the LF_FIELDLIST record to this record.
uint16_t offset = 0;
};
class PdbSymUid {
uint64_t m_repr = 0;
public:
PdbSymUid() = default;
PdbSymUid(uint64_t repr) : m_repr(repr) {}
PdbSymUid(const PdbCompilandId &cid);
PdbSymUid(const PdbCompilandSymId &csid);
PdbSymUid(const PdbGlobalSymId &gsid);
PdbSymUid(const PdbTypeSymId &tsid);
PdbSymUid(const PdbFieldListMemberId &flmid);
uint64_t toOpaqueId() const { return m_repr; }
PdbSymUidKind kind() const;
PdbCompilandId asCompiland() const;
PdbCompilandSymId asCompilandSym() const;
PdbGlobalSymId asGlobalSym() const;
PdbTypeSymId asTypeSym() const;
PdbFieldListMemberId asFieldListMember() const;
};
template <typename T> uint64_t toOpaqueUid(const T &cid) {
return PdbSymUid(cid).toOpaqueId();
}
struct SymbolAndUid {
llvm::codeview::CVSymbol sym;
PdbSymUid uid;
};
} // namespace npdb
} // namespace lldb_private
#endif
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