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//===- lib/MC/MCFragment.cpp - Assembler Fragment Implementation ----------===//
//
// 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 "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <type_traits>
#include <utility>
using namespace llvm;
static_assert(std::is_trivially_destructible_v<MCFragment>,
"fragment classes must be trivially destructible");
MCFragment::MCFragment(FragmentType Kind, bool HasInstructions)
: Kind(Kind), LinkerRelaxable(false), HasInstructions(HasInstructions),
AllowAutoPadding(false) {
static_assert(sizeof(MCFragment::Tail) <= 16,
"Keep the variable-size tail small");
}
const MCSymbol *MCFragment::getAtom() const {
return cast<MCSectionMachO>(Parent)->getAtom(LayoutOrder);
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void MCFragment::dump() const {
raw_ostream &OS = errs();
OS << Offset << ' ';
switch (getKind()) {
// clang-format off
case MCFragment::FT_Align: OS << "Align"; break;
case MCFragment::FT_Data: OS << "Data"; break;
case MCFragment::FT_Fill: OS << "Fill"; break;
case MCFragment::FT_Nops: OS << "Nops"; break;
case MCFragment::FT_Relaxable: OS << "Relaxable"; break;
case MCFragment::FT_Org: OS << "Org"; break;
case MCFragment::FT_Dwarf: OS << "Dwarf"; break;
case MCFragment::FT_DwarfFrame: OS << "DwarfCallFrame"; break;
case MCFragment::FT_LEB: OS << "LEB"; break;
case MCFragment::FT_BoundaryAlign: OS<<"BoundaryAlign"; break;
case MCFragment::FT_SymbolId: OS << "SymbolId"; break;
case MCFragment::FT_CVInlineLines: OS << "CVInlineLineTable"; break;
case MCFragment::FT_CVDefRange: OS << "CVDefRangeTable"; break;
case MCFragment::FT_PseudoProbe: OS << "PseudoProbe"; break;
// clang-format on
}
auto printFixups = [&](llvm::ArrayRef<MCFixup> Fixups) {
if (Fixups.empty())
return;
for (auto [I, F] : llvm::enumerate(Fixups)) {
OS << "\n Fixup @" << F.getOffset() << " Value:";
F.getValue()->print(OS, nullptr);
OS << " Kind:" << F.getKind();
}
};
switch (getKind()) {
case MCFragment::FT_Align: {
const auto *AF = cast<MCAlignFragment>(this);
OS << " Align:" << AF->getAlignment().value() << " Fill:" << AF->getFill()
<< " FillLen:" << unsigned(AF->getFillLen())
<< " MaxBytesToEmit:" << AF->getMaxBytesToEmit();
if (AF->hasEmitNops())
OS << " Nops";
break;
}
case MCFragment::FT_Data:
case MCFragment::FT_Relaxable:
case MCFragment::FT_LEB:
case MCFragment::FT_Dwarf:
case MCFragment::FT_DwarfFrame: {
if (isLinkerRelaxable())
OS << " LinkerRelaxable";
auto Fixed = getContents();
auto Var = getVarContents();
OS << " Size:" << Fixed.size();
if (getKind() != MCFragment::FT_Data)
OS << '+' << Var.size();
OS << " [";
for (unsigned i = 0, e = Fixed.size(); i != e; ++i) {
if (i) OS << ",";
OS << format("%02x", uint8_t(Fixed[i]));
}
for (unsigned i = 0, e = Var.size(); i != e; ++i) {
if (Fixed.size() || i)
OS << ",";
OS << format("%02x", uint8_t(Var[i]));
}
OS << ']';
switch (getKind()) {
case MCFragment::FT_Data:
break;
case MCFragment::FT_Relaxable:
OS << ' ';
getInst().dump_pretty(OS);
break;
case MCFragment::FT_LEB: {
OS << " Value:";
getLEBValue().print(OS, nullptr);
OS << " Signed:" << isLEBSigned();
break;
}
case MCFragment::FT_Dwarf:
OS << " AddrDelta:";
getDwarfAddrDelta().print(OS, nullptr);
OS << " LineDelta:" << getDwarfLineDelta();
break;
case MCFragment::FT_DwarfFrame:
OS << " AddrDelta:";
getDwarfAddrDelta().print(OS, nullptr);
break;
default:
llvm_unreachable("");
}
printFixups(getFixups());
printFixups(getVarFixups());
break;
}
case MCFragment::FT_Fill: {
const auto *FF = cast<MCFillFragment>(this);
OS << " Value:" << static_cast<unsigned>(FF->getValue())
<< " ValueSize:" << static_cast<unsigned>(FF->getValueSize())
<< " NumValues:";
FF->getNumValues().print(OS, nullptr);
break;
}
case MCFragment::FT_Nops: {
const auto *NF = cast<MCNopsFragment>(this);
OS << " NumBytes:" << NF->getNumBytes()
<< " ControlledNopLength:" << NF->getControlledNopLength();
break;
}
case MCFragment::FT_Org: {
const auto *OF = cast<MCOrgFragment>(this);
OS << " Offset:";
OF->getOffset().print(OS, nullptr);
OS << " Value:" << static_cast<unsigned>(OF->getValue());
break;
}
case MCFragment::FT_BoundaryAlign: {
const auto *BF = cast<MCBoundaryAlignFragment>(this);
OS << " BoundarySize:" << BF->getAlignment().value()
<< " LastFragment:" << BF->getLastFragment()
<< " Size:" << BF->getSize();
break;
}
case MCFragment::FT_SymbolId: {
const auto *F = cast<MCSymbolIdFragment>(this);
OS << " Sym:" << F->getSymbol();
break;
}
case MCFragment::FT_CVInlineLines: {
const auto *F = cast<MCCVInlineLineTableFragment>(this);
OS << " Sym:" << *F->getFnStartSym();
break;
}
case MCFragment::FT_CVDefRange: {
const auto *F = cast<MCCVDefRangeFragment>(this);
OS << "\n ";
for (std::pair<const MCSymbol *, const MCSymbol *> RangeStartEnd :
F->getRanges()) {
OS << " RangeStart:" << RangeStartEnd.first;
OS << " RangeEnd:" << RangeStartEnd.second;
}
break;
}
case MCFragment::FT_PseudoProbe: {
const auto *OF = cast<MCPseudoProbeAddrFragment>(this);
OS << " AddrDelta:";
OF->getAddrDelta().print(OS, nullptr);
break;
}
}
}
#endif
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