| //===- lib/MC/MCSectionCOFF.cpp - COFF 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/MCSectionCOFF.h" |
| #include "llvm/BinaryFormat/COFF.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cassert> |
| |
| using namespace llvm; |
| |
| // ShouldOmitSectionDirective - Decides whether a '.section' directive |
| // should be printed before the section name |
| bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name, |
| const MCAsmInfo &MAI) const { |
| if (COMDATSymbol) |
| return false; |
| |
| // FIXME: Does .section .bss/.data/.text work everywhere?? |
| if (Name == ".text" || Name == ".data" || Name == ".bss") |
| return true; |
| |
| return false; |
| } |
| |
| void MCSectionCOFF::setSelection(int Selection) const { |
| assert(Selection != 0 && "invalid COMDAT selection type"); |
| this->Selection = Selection; |
| Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; |
| } |
| |
| void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T, |
| raw_ostream &OS, |
| const MCExpr *Subsection) const { |
| // standard sections don't require the '.section' |
| if (ShouldOmitSectionDirective(getName(), MAI)) { |
| OS << '\t' << getName() << '\n'; |
| return; |
| } |
| |
| OS << "\t.section\t" << getName() << ",\""; |
| if (getCharacteristics() & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA) |
| OS << 'd'; |
| if (getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) |
| OS << 'b'; |
| if (getCharacteristics() & COFF::IMAGE_SCN_MEM_EXECUTE) |
| OS << 'x'; |
| if (getCharacteristics() & COFF::IMAGE_SCN_MEM_WRITE) |
| OS << 'w'; |
| else if (getCharacteristics() & COFF::IMAGE_SCN_MEM_READ) |
| OS << 'r'; |
| else |
| OS << 'y'; |
| if (getCharacteristics() & COFF::IMAGE_SCN_LNK_REMOVE) |
| OS << 'n'; |
| if (getCharacteristics() & COFF::IMAGE_SCN_MEM_SHARED) |
| OS << 's'; |
| if ((getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE) && |
| !isImplicitlyDiscardable(getName())) |
| OS << 'D'; |
| OS << '"'; |
| |
| if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) { |
| if (COMDATSymbol) |
| OS << ","; |
| else |
| OS << "\n\t.linkonce\t"; |
| switch (Selection) { |
| case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES: |
| OS << "one_only"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_ANY: |
| OS << "discard"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE: |
| OS << "same_size"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH: |
| OS << "same_contents"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE: |
| OS << "associative"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_LARGEST: |
| OS << "largest"; |
| break; |
| case COFF::IMAGE_COMDAT_SELECT_NEWEST: |
| OS << "newest"; |
| break; |
| default: |
| assert(false && "unsupported COFF selection type"); |
| break; |
| } |
| if (COMDATSymbol) { |
| OS << ","; |
| COMDATSymbol->print(OS, &MAI); |
| } |
| } |
| OS << '\n'; |
| } |
| |
| bool MCSectionCOFF::UseCodeAlign() const { |
| return getKind().isText(); |
| } |
| |
| bool MCSectionCOFF::isVirtualSection() const { |
| return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA; |
| } |
| |
| StringRef MCSectionCOFF::getVirtualSectionKind() const { |
| return "IMAGE_SCN_CNT_UNINITIALIZED_DATA"; |
| } |