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//===- UDTLayout.cpp --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/PDB/UDTLayout.h"
#include "llvm/DebugInfo/PDB/IPDBSession.h"
#include "llvm/DebugInfo/PDB/PDBSymbol.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "llvm/DebugInfo/PDB/PDBSymbolExe.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeBaseClass.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypePointer.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeVTable.h"
#include <utility>
using namespace llvm;
using namespace llvm::pdb;
static std::unique_ptr<PDBSymbol> getSymbolType(const PDBSymbol &Symbol) {
const IPDBSession &Session = Symbol.getSession();
const IPDBRawSymbol &RawSymbol = Symbol.getRawSymbol();
uint32_t TypeId = RawSymbol.getTypeId();
return Session.getSymbolById(TypeId);
}
static uint32_t getTypeLength(const PDBSymbol &Symbol) {
auto SymbolType = getSymbolType(Symbol);
const IPDBRawSymbol &RawType = SymbolType->getRawSymbol();
return RawType.getLength();
}
StorageItemBase::StorageItemBase(const UDTLayoutBase &Parent,
const PDBSymbol &Symbol,
const std::string &Name,
uint32_t OffsetInParent, uint32_t Size)
: Parent(Parent), Symbol(Symbol), Name(Name),
OffsetInParent(OffsetInParent), SizeOf(Size) {
UsedBytes.resize(SizeOf, true);
}
uint32_t StorageItemBase::deepPaddingSize() const {
// sizeof(Field) - sizeof(typeof(Field)) is trailing padding.
return SizeOf - getTypeLength(Symbol);
}
DataMemberLayoutItem::DataMemberLayoutItem(
const UDTLayoutBase &Parent, std::unique_ptr<PDBSymbolData> DataMember)
: StorageItemBase(Parent, *DataMember, DataMember->getName(),
DataMember->getOffset(), getTypeLength(*DataMember)),
DataMember(std::move(DataMember)) {
auto Type = this->DataMember->getType();
if (auto UDT = unique_dyn_cast<PDBSymbolTypeUDT>(Type)) {
// UDT data members might have padding in between fields, but otherwise
// a member should occupy its entire storage.
UsedBytes.resize(SizeOf, false);
UdtLayout = llvm::make_unique<ClassLayout>(std::move(UDT));
}
}
const PDBSymbolData &DataMemberLayoutItem::getDataMember() {
return *dyn_cast<PDBSymbolData>(&Symbol);
}
uint32_t DataMemberLayoutItem::deepPaddingSize() const {
uint32_t Result = StorageItemBase::deepPaddingSize();
if (UdtLayout)
Result += UdtLayout->deepPaddingSize();
return Result;
}
VTableLayoutItem::VTableLayoutItem(const UDTLayoutBase &Parent,
std::unique_ptr<PDBSymbolTypeVTable> VTable)
: StorageItemBase(Parent, *VTable, "<vtbl>", 0, getTypeLength(*VTable)),
VTable(std::move(VTable)) {
// initialize vtbl methods.
auto VTableType = cast<PDBSymbolTypePointer>(this->VTable->getType());
uint32_t PointerSize = VTableType->getLength();
if (auto Shape = unique_dyn_cast<PDBSymbolTypeVTableShape>(
VTableType->getPointeeType())) {
VTableFuncs.resize(Shape->getCount());
auto ParentFunctions =
Parent.getSymbolBase().findAllChildren<PDBSymbolFunc>();
while (auto Func = ParentFunctions->getNext()) {
if (Func->isVirtual()) {
uint32_t Index = Func->getVirtualBaseOffset();
assert(Index % PointerSize == 0);
Index /= PointerSize;
// Don't allow a compiler generated function to overwrite a user
// function in the VTable. Not sure why this happens, but a function
// named __vecDelDtor sometimes shows up on top of the destructor.
if (Func->isCompilerGenerated() && VTableFuncs[Index])
continue;
VTableFuncs[Index] = std::move(Func);
}
}
}
}
UDTLayoutBase::UDTLayoutBase(const PDBSymbol &Symbol, const std::string &Name,
uint32_t Size)
: SymbolBase(Symbol), Name(Name), SizeOf(Size) {
UsedBytes.resize(Size);
ChildrenPerByte.resize(Size);
initializeChildren(Symbol);
}
ClassLayout::ClassLayout(const PDBSymbolTypeUDT &UDT)
: UDTLayoutBase(UDT, UDT.getName(), UDT.getLength()), UDT(UDT) {}
ClassLayout::ClassLayout(std::unique_ptr<PDBSymbolTypeUDT> UDT)
: ClassLayout(*UDT) {
OwnedStorage = std::move(UDT);
}
BaseClassLayout::BaseClassLayout(const UDTLayoutBase &Parent,
std::unique_ptr<PDBSymbolTypeBaseClass> Base)
: UDTLayoutBase(*Base, Base->getName(), Base->getLength()),
StorageItemBase(Parent, *Base, Base->getName(), Base->getOffset(),
Base->getLength()),
Base(std::move(Base)) {
IsVirtualBase = this->Base->isVirtualBaseClass();
}
uint32_t UDTLayoutBase::shallowPaddingSize() const {
return UsedBytes.size() - UsedBytes.count();
}
uint32_t UDTLayoutBase::deepPaddingSize() const {
uint32_t Result = shallowPaddingSize();
for (auto &Child : ChildStorage)
Result += Child->deepPaddingSize();
return Result;
}
void UDTLayoutBase::initializeChildren(const PDBSymbol &Sym) {
auto Children = Sym.findAllChildren();
while (auto Child = Children->getNext()) {
if (auto Data = unique_dyn_cast<PDBSymbolData>(Child)) {
if (Data->getDataKind() == PDB_DataKind::Member) {
auto DM =
llvm::make_unique<DataMemberLayoutItem>(*this, std::move(Data));
addChildToLayout(std::move(DM));
} else {
NonStorageItems.push_back(std::move(Data));
}
continue;
}
if (auto Base = unique_dyn_cast<PDBSymbolTypeBaseClass>(Child)) {
auto BL = llvm::make_unique<BaseClassLayout>(*this, std::move(Base));
BaseClasses.push_back(BL.get());
addChildToLayout(std::move(BL));
continue;
}
if (auto VT = unique_dyn_cast<PDBSymbolTypeVTable>(Child)) {
auto VTLayout = llvm::make_unique<VTableLayoutItem>(*this, std::move(VT));
VTable = VTLayout.get();
addChildToLayout(std::move(VTLayout));
continue;
}
NonStorageItems.push_back(std::move(Child));
}
}
void UDTLayoutBase::addChildToLayout(std::unique_ptr<StorageItemBase> Child) {
uint32_t Begin = Child->getOffsetInParent();
uint32_t End = Begin + Child->getSize();
UsedBytes.set(Begin, End);
while (Begin != End) {
ChildrenPerByte[Begin].push_back(Child.get());
++Begin;
}
auto Loc = std::upper_bound(
ChildStorage.begin(), ChildStorage.end(), Begin,
[](uint32_t Off, const std::unique_ptr<StorageItemBase> &Item) {
return Off < Item->getOffsetInParent();
});
ChildStorage.insert(Loc, std::move(Child));
}
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