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//===- lib/MC/MCSection.cpp - Machine Code Section Representation ---------===//
//
// 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/MC/MCSection.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <utility>
using namespace llvm;
MCSection::MCSection(SectionVariant V, StringRef Name, bool IsText,
bool IsVirtual, MCSymbol *Begin)
: Begin(Begin), HasInstructions(false), IsRegistered(false), IsText(IsText),
IsVirtual(IsVirtual), LinkerRelaxable(false), Name(Name), Variant(V) {
// The initial subsection number is 0. Create a fragment list.
CurFragList = &Subsections.emplace_back(0u, FragList{}).second;
}
MCSymbol *MCSection::getEndSymbol(MCContext &Ctx) {
if (!End)
End = Ctx.createTempSymbol("sec_end");
return End;
}
bool MCSection::hasEnded() const { return End && End->isInSection(); }
StringRef MCSection::getVirtualSectionKind() const { return "virtual"; }
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void MCSection::dump(
DenseMap<const MCFragment *, SmallVector<const MCSymbol *, 0>> *FragToSyms)
const {
raw_ostream &OS = errs();
OS << "MCSection Name:" << getName();
for (auto &F : *this) {
OS << '\n';
F.dump();
if (!FragToSyms)
continue;
auto It = FragToSyms->find(&F);
if (It == FragToSyms->end())
continue;
for (auto *Sym : It->second) {
OS << "\n Symbol @" << Sym->getOffset() << ' ' << Sym->getName();
if (Sym->isTemporary())
OS << " Temporary";
}
}
}
#endif
void MCFragment::setContents(ArrayRef<char> Contents) {
auto &S = getParent()->ContentStorage;
if (ContentStart + Contents.size() > ContentEnd) {
ContentStart = S.size();
S.resize_for_overwrite(S.size() + Contents.size());
}
ContentEnd = ContentStart + Contents.size();
llvm::copy(Contents, S.begin() + ContentStart);
}
void MCFragment::setVarContents(ArrayRef<char> Contents) {
auto &S = getParent()->ContentStorage;
if (VarContentStart + Contents.size() > VarContentEnd) {
VarContentStart = S.size();
S.resize_for_overwrite(S.size() + Contents.size());
}
VarContentEnd = VarContentStart + Contents.size();
llvm::copy(Contents, S.begin() + VarContentStart);
}
void MCFragment::addFixup(MCFixup Fixup) { appendFixups({Fixup}); }
void MCFragment::appendFixups(ArrayRef<MCFixup> Fixups) {
auto &S = getParent()->FixupStorage;
if (LLVM_UNLIKELY(FixupEnd != S.size())) {
// Move the elements to the end. Reserve space to avoid invalidating
// S.begin()+I for `append`.
auto Size = FixupEnd - FixupStart;
auto I = std::exchange(FixupStart, S.size());
S.reserve(S.size() + Size);
S.append(S.begin() + I, S.begin() + I + Size);
}
S.append(Fixups.begin(), Fixups.end());
FixupEnd = S.size();
}
void MCFragment::setFixups(ArrayRef<MCFixup> Fixups) {
auto &S = getParent()->FixupStorage;
if (FixupStart + Fixups.size() > FixupEnd) {
FixupStart = S.size();
S.resize_for_overwrite(S.size() + Fixups.size());
}
FixupEnd = FixupStart + Fixups.size();
llvm::copy(Fixups, S.begin() + FixupStart);
}
void MCFragment::setVarFixups(ArrayRef<MCFixup> Fixups) {
auto &S = getParent()->FixupStorage;
if (VarFixupStart + Fixups.size() > VarFixupEnd) {
VarFixupStart = S.size();
S.resize_for_overwrite(S.size() + Fixups.size());
}
VarFixupEnd = VarFixupStart + Fixups.size();
// Source fixup offsets are relative to the variable part's start. Add the
// fixed part size to make them relative to the fixed part's start.
std::transform(Fixups.begin(), Fixups.end(), S.begin() + VarFixupStart,
[Fixed = getFixedSize()](MCFixup F) {
F.setOffset(Fixed + F.getOffset());
return F;
});
}
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