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//===-- PdbSymUid.cpp -----------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "PdbSymUid.h"
using namespace lldb_private;
using namespace lldb_private::npdb;
using namespace llvm::codeview;
namespace {
struct GenericIdRepr {
uint64_t tag : 4;
uint64_t data : 60;
};
struct CompilandIdRepr {
uint64_t tag : 4;
uint64_t modi : 16;
uint64_t unused : 44;
};
struct CompilandSymIdRepr {
uint64_t tag : 4;
uint64_t modi : 16;
uint64_t offset : 32;
uint64_t unused : 12;
};
struct GlobalSymIdRepr {
uint64_t tag : 4;
uint64_t offset : 32;
uint64_t pub : 1;
uint64_t unused : 27;
};
struct TypeSymIdRepr {
uint64_t tag : 4;
uint64_t index : 32;
uint64_t ipi : 1;
uint64_t unused : 27;
};
struct FieldListMemberIdRepr {
uint64_t tag : 4;
uint64_t index : 32;
uint64_t offset : 16;
uint64_t unused : 12;
};
static_assert(sizeof(CompilandIdRepr) == 8, "Invalid structure size!");
static_assert(sizeof(CompilandSymIdRepr) == 8, "Invalid structure size!");
static_assert(sizeof(GlobalSymIdRepr) == 8, "Invalid structure size!");
static_assert(sizeof(TypeSymIdRepr) == 8, "Invalid structure size!");
static_assert(sizeof(FieldListMemberIdRepr) == 8, "Invalid structure size!");
} // namespace
template <typename OutT, typename InT> static OutT repr_cast(const InT &value) {
OutT result;
::memcpy(&result, &value, sizeof(value));
return result;
}
PdbSymUid::PdbSymUid(const PdbCompilandId &cid) {
CompilandIdRepr repr;
::memset(&repr, 0, sizeof(repr));
repr.modi = cid.modi;
repr.tag = static_cast<uint64_t>(PdbSymUidKind::Compiland);
m_repr = repr_cast<uint64_t>(repr);
}
PdbSymUid::PdbSymUid(const PdbCompilandSymId &csid) {
CompilandSymIdRepr repr;
::memset(&repr, 0, sizeof(repr));
repr.modi = csid.modi;
repr.offset = csid.offset;
repr.tag = static_cast<uint64_t>(PdbSymUidKind::CompilandSym);
m_repr = repr_cast<uint64_t>(repr);
}
PdbSymUid::PdbSymUid(const PdbGlobalSymId &gsid) {
GlobalSymIdRepr repr;
::memset(&repr, 0, sizeof(repr));
repr.pub = gsid.is_public;
repr.offset = gsid.offset;
repr.tag = static_cast<uint64_t>(PdbSymUidKind::GlobalSym);
m_repr = repr_cast<uint64_t>(repr);
}
PdbSymUid::PdbSymUid(const PdbTypeSymId &tsid) {
TypeSymIdRepr repr;
::memset(&repr, 0, sizeof(repr));
repr.index = tsid.index.getIndex();
repr.ipi = tsid.is_ipi;
repr.tag = static_cast<uint64_t>(PdbSymUidKind::Type);
m_repr = repr_cast<uint64_t>(repr);
}
PdbSymUid::PdbSymUid(const PdbFieldListMemberId &flmid) {
FieldListMemberIdRepr repr;
::memset(&repr, 0, sizeof(repr));
repr.index = flmid.index.getIndex();
repr.offset = flmid.offset;
repr.tag = static_cast<uint64_t>(PdbSymUidKind::FieldListMember);
m_repr = repr_cast<uint64_t>(repr);
}
PdbSymUidKind PdbSymUid::kind() const {
GenericIdRepr generic = repr_cast<GenericIdRepr>(m_repr);
return static_cast<PdbSymUidKind>(generic.tag);
}
PdbCompilandId PdbSymUid::asCompiland() const {
assert(kind() == PdbSymUidKind::Compiland);
auto repr = repr_cast<CompilandIdRepr>(m_repr);
PdbCompilandId result;
result.modi = repr.modi;
return result;
}
PdbCompilandSymId PdbSymUid::asCompilandSym() const {
assert(kind() == PdbSymUidKind::CompilandSym);
auto repr = repr_cast<CompilandSymIdRepr>(m_repr);
PdbCompilandSymId result;
result.modi = repr.modi;
result.offset = repr.offset;
return result;
}
PdbGlobalSymId PdbSymUid::asGlobalSym() const {
assert(kind() == PdbSymUidKind::GlobalSym ||
kind() == PdbSymUidKind::PublicSym);
auto repr = repr_cast<GlobalSymIdRepr>(m_repr);
PdbGlobalSymId result;
result.is_public = repr.pub;
result.offset = repr.offset;
return result;
}
PdbTypeSymId PdbSymUid::asTypeSym() const {
assert(kind() == PdbSymUidKind::Type);
auto repr = repr_cast<TypeSymIdRepr>(m_repr);
PdbTypeSymId result;
result.index.setIndex(repr.index);
result.is_ipi = repr.ipi;
return result;
}
PdbFieldListMemberId PdbSymUid::asFieldListMember() const {
assert(kind() == PdbSymUidKind::FieldListMember);
auto repr = repr_cast<FieldListMemberIdRepr>(m_repr);
PdbFieldListMemberId result;
result.index.setIndex(repr.index);
result.offset = repr.offset;
return result;
}
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