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//===- PrettyClassDefinitionDumper.cpp --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "PrettyClassDefinitionDumper.h"
#include "LinePrinter.h"
#include "PrettyEnumDumper.h"
#include "PrettyFunctionDumper.h"
#include "PrettyTypedefDumper.h"
#include "PrettyVariableDumper.h"
#include "llvm-pdbdump.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/DebugInfo/PDB/IPDBSession.h"
#include "llvm/DebugInfo/PDB/PDBExtras.h"
#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeBaseClass.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeEnum.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypePointer.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeTypedef.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"
#include "llvm/DebugInfo/PDB/PDBSymbolTypeVTable.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Format.h"
using namespace llvm;
using namespace llvm::pdb;
ClassDefinitionDumper::ClassDefinitionDumper(LinePrinter &P)
: PDBSymDumper(true), Printer(P) {}
static void analyzePadding(const PDBSymbolTypeUDT &Class, BitVector &Padding,
uint32_t &FirstFieldOffset) {
Padding.resize(Class.getLength(), true);
auto Children = Class.findAllChildren<PDBSymbolData>();
bool IsFirst = true;
FirstFieldOffset = Class.getLength();
while (auto Data = Children->getNext()) {
// Ignore data members which are not relative to this. Usually these are
// static data members or constexpr and occupy no space. We also need to
// handle BitFields since the PDB doesn't consider them ThisRel, but they
// still occupy space in the record layout.
auto LocType = Data->getLocationType();
if (LocType != PDB_LocType::ThisRel && LocType != PDB_LocType::BitField)
continue;
uint64_t Start = Data->getOffset();
if (IsFirst) {
FirstFieldOffset = Start;
IsFirst = false;
}
auto VarType = Data->getType();
uint64_t Size = VarType->getRawSymbol().getLength();
Padding.reset(Start, Start + Size);
}
// Unmark anything that comes before the first field so it doesn't get
// counted as padding. In reality this is going to be vptrs or base class
// members, but we don't correctly handle that yet.
// FIXME: Handle it.
Padding.reset(0, FirstFieldOffset);
}
void ClassDefinitionDumper::start(const PDBSymbolTypeUDT &Class) {
assert(opts::pretty::ClassFormat !=
opts::pretty::ClassDefinitionFormat::None);
uint32_t Size = Class.getLength();
uint32_t FirstFieldOffset = 0;
BitVector Padding;
analyzePadding(Class, Padding, FirstFieldOffset);
if (opts::pretty::OnlyPaddingClasses && (Padding.count() == 0))
return;
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Comment).get() << "// sizeof = " << Size;
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Keyword).get() << Class.getUdtKind() << " ";
WithColor(Printer, PDB_ColorItem::Type).get() << Class.getName();
auto Bases = Class.findAllChildren<PDBSymbolTypeBaseClass>();
if (Bases->getChildCount() > 0) {
Printer.Indent();
Printer.NewLine();
Printer << ":";
uint32_t BaseIndex = 0;
while (auto Base = Bases->getNext()) {
Printer << " ";
WithColor(Printer, PDB_ColorItem::Keyword).get() << Base->getAccess();
if (Base->isVirtualBaseClass())
WithColor(Printer, PDB_ColorItem::Keyword).get() << " virtual";
WithColor(Printer, PDB_ColorItem::Type).get() << " " << Base->getName();
if (++BaseIndex < Bases->getChildCount()) {
Printer.NewLine();
Printer << ",";
}
}
Printer.Unindent();
}
Printer << " {";
auto Children = Class.findAllChildren();
Printer.Indent();
int DumpedCount = 0;
int NextPaddingByte = Padding.find_first();
while (auto Child = Children->getNext()) {
if (auto Data = llvm::dyn_cast<PDBSymbolData>(Child.get())) {
if (Data->getDataKind() == PDB_DataKind::Member && NextPaddingByte >= 0) {
// If there are padding bytes remaining, see if this field is the first
// to cross a padding boundary, and print a padding field indicator if
// so.
int Off = Data->getOffset();
if (Off > NextPaddingByte) {
uint32_t Amount = Off - NextPaddingByte;
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Padding).get()
<< "<padding> (" << Amount << " bytes)";
assert(Padding.find_next_unset(NextPaddingByte) == Off);
NextPaddingByte = Padding.find_next(Off);
}
}
}
if (auto Func = Child->cast<PDBSymbolFunc>()) {
if (Func->isCompilerGenerated() && opts::pretty::ExcludeCompilerGenerated)
continue;
if (Func->getLength() == 0 && !Func->isPureVirtual() &&
!Func->isIntroVirtualFunction())
continue;
}
++DumpedCount;
Child->dump(*this);
}
if (NextPaddingByte >= 0) {
uint32_t Amount = Size - NextPaddingByte;
Printer.NewLine();
WithColor(Printer, PDB_ColorItem::Padding).get() << "<padding> (" << Amount
<< " bytes)";
}
Printer.Unindent();
if (DumpedCount > 0)
Printer.NewLine();
Printer << "}";
Printer.NewLine();
if (Padding.count() > 0) {
APFloat Pct(100.0 * (double)Padding.count() /
(double)(Size - FirstFieldOffset));
SmallString<8> PctStr;
Pct.toString(PctStr, 4);
WithColor(Printer, PDB_ColorItem::Padding).get()
<< "Total padding " << Padding.count() << " bytes (" << PctStr
<< "% of class size)";
Printer.NewLine();
}
}
void ClassDefinitionDumper::dump(const PDBSymbolTypeBaseClass &Symbol) {}
void ClassDefinitionDumper::dump(const PDBSymbolData &Symbol) {
VariableDumper Dumper(Printer);
Dumper.start(Symbol);
}
void ClassDefinitionDumper::dump(const PDBSymbolFunc &Symbol) {
if (Printer.IsSymbolExcluded(Symbol.getName()))
return;
Printer.NewLine();
FunctionDumper Dumper(Printer);
Dumper.start(Symbol, FunctionDumper::PointerType::None);
}
void ClassDefinitionDumper::dump(const PDBSymbolTypeVTable &Symbol) {}
void ClassDefinitionDumper::dump(const PDBSymbolTypeEnum &Symbol) {
if (Printer.IsTypeExcluded(Symbol.getName()))
return;
Printer.NewLine();
EnumDumper Dumper(Printer);
Dumper.start(Symbol);
}
void ClassDefinitionDumper::dump(const PDBSymbolTypeTypedef &Symbol) {
if (Printer.IsTypeExcluded(Symbol.getName()))
return;
Printer.NewLine();
TypedefDumper Dumper(Printer);
Dumper.start(Symbol);
}
void ClassDefinitionDumper::dump(const PDBSymbolTypeUDT &Symbol) {}
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