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//===- PrettyClassLayoutGraphicalDumper.h -----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "PrettyClassLayoutGraphicalDumper.h"
#include "LinePrinter.h"
#include "PrettyClassDefinitionDumper.h"
#include "PrettyVariableDumper.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeBaseClass.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
#include "llvm/DebugInfo/PDB/UDTLayout.h"
#include "llvm/Support/Format.h"
using namespace llvm;
using namespace llvm::pdb;
PrettyClassLayoutGraphicalDumper::PrettyClassLayoutGraphicalDumper(
LinePrinter &P, uint32_t InitialOffset)
: PDBSymDumper(true), Printer(P), ClassOffsetZero(InitialOffset),
CurrentAbsoluteOffset(InitialOffset) {}
bool PrettyClassLayoutGraphicalDumper::start(const UDTLayoutBase &Layout) {
const BitVector &UseMap = Layout.usedBytes();
int NextPaddingByte = UseMap.find_first_unset();
for (auto &Item : Layout.layout_items()) {
// Calculate the absolute offset of the first byte of the next field.
uint32_t RelativeOffset = Item->getOffsetInParent();
CurrentAbsoluteOffset = ClassOffsetZero + RelativeOffset;
// Since there is storage there, it should be set! However, this might
// be an empty base, in which case it could extend outside the bounds of
// the parent class.
if (RelativeOffset < UseMap.size() && (Item->getSize() > 0)) {
assert(UseMap.test(RelativeOffset));
// If there is any remaining padding in this class, and the offset of the
// new item is after the padding, then we must have just jumped over some
// padding. Print a padding row and then look for where the next block
// of padding begins.
if ((NextPaddingByte >= 0) &&
(RelativeOffset > uint32_t(NextPaddingByte))) {
printPaddingRow(RelativeOffset - NextPaddingByte);
NextPaddingByte = UseMap.find_next_unset(RelativeOffset);
}
}
CurrentItem = Item;
if (Item->isVBPtr()) {
VTableLayoutItem &Layout = static_cast<VTableLayoutItem &>(*CurrentItem);
VariableDumper VarDumper(Printer);
VarDumper.startVbptr(CurrentAbsoluteOffset, Layout.getSize());
} else {
if (auto Sym = Item->getSymbol())
Sym->dump(*this);
}
if (Item->getLayoutSize() > 0) {
uint32_t Prev = RelativeOffset + Item->getLayoutSize() - 1;
NextPaddingByte = UseMap.find_next_unset(Prev);
}
}
auto TailPadding = Layout.tailPadding();
if (TailPadding > 0) {
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Padding).get() << "<padding> ("
<< TailPadding << " bytes)";
DumpedAnything = true;
}
return DumpedAnything;
}
void PrettyClassLayoutGraphicalDumper::printPaddingRow(uint32_t Amount) {
if (Amount == 0)
return;
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Padding).get() << "<padding> (" << Amount
<< " bytes)";
DumpedAnything = true;
}
void PrettyClassLayoutGraphicalDumper::dump(
const PDBSymbolTypeBaseClass &Symbol) {
assert(CurrentItem != nullptr);
Printer.NewLine();
BaseClassLayout &Layout = static_cast<BaseClassLayout &>(*CurrentItem);
std::string Label = "base";
if (Layout.isVirtualBase()) {
Label.insert(Label.begin(), 'v');
if (Layout.getBase().isIndirectVirtualBaseClass())
Label.insert(Label.begin(), 'i');
}
Printer << Label << " ";
uint32_t Size = Layout.isEmptyBase() ? 1 : Layout.getLayoutSize();
WithColor(Printer, PDB_ColorItem::Offset).get()
<< "+" << format_hex(CurrentAbsoluteOffset, 4) << " [sizeof=" << Size
<< "] ";
WithColor(Printer, PDB_ColorItem::Identifier).get() << Layout.getName();
Printer.Indent();
uint32_t ChildOffsetZero = ClassOffsetZero + Layout.getOffsetInParent();
PrettyClassLayoutGraphicalDumper BaseDumper(Printer, ChildOffsetZero);
BaseDumper.start(Layout);
Printer.Unindent();
DumpedAnything = true;
}
void PrettyClassLayoutGraphicalDumper::dump(const PDBSymbolData &Symbol) {
assert(CurrentItem != nullptr);
DataMemberLayoutItem &Layout =
static_cast<DataMemberLayoutItem &>(*CurrentItem);
VariableDumper VarDumper(Printer);
VarDumper.start(Symbol, ClassOffsetZero);
if (Layout.hasUDTLayout()) {
Printer.Indent();
PrettyClassLayoutGraphicalDumper TypeDumper(Printer, ClassOffsetZero);
TypeDumper.start(Layout.getUDTLayout());
Printer.Unindent();
}
DumpedAnything = true;
}
void PrettyClassLayoutGraphicalDumper::dump(const PDBSymbolTypeVTable &Symbol) {
assert(CurrentItem != nullptr);
VariableDumper VarDumper(Printer);
VarDumper.start(Symbol, ClassOffsetZero);
DumpedAnything = true;
}
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