f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
//===- lib/MC/MCSectionCOFF.cpp - COFF Code Section Representation --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSectionCOFF::~MCSectionCOFF() {} // anchor.
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// ShouldOmitSectionDirective - Decides whether a '.section' directive
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// should be printed before the section name
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bool MCSectionCOFF::ShouldOmitSectionDirective(StringRef Name,
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const MCAsmInfo &MAI) const {
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// FIXME: Does .section .bss/.data/.text work everywhere??
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if (Name == ".text" || Name == ".data" || Name == ".bss")
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return true;
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return false;
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}
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void MCSectionCOFF::setSelection(int Selection,
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const MCSectionCOFF *Assoc) const {
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assert(Selection != 0 && "invalid COMDAT selection type");
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assert((Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) ==
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(Assoc != 0) &&
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"associative COMDAT section must have an associated section");
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this->Selection = Selection;
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this->Assoc = Assoc;
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Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
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}
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void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS,
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const MCExpr *Subsection) const {
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// standard sections don't require the '.section'
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if (ShouldOmitSectionDirective(SectionName, MAI)) {
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OS << '\t' << getSectionName() << '\n';
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return;
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}
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OS << "\t.section\t" << getSectionName() << ",\"";
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if (getKind().isText())
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OS << 'x';
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if (getKind().isWriteable())
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OS << 'w';
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else
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OS << 'r';
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if (getCharacteristics() & COFF::IMAGE_SCN_MEM_DISCARDABLE)
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OS << 'n';
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OS << "\"\n";
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if (getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
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switch (Selection) {
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case COFF::IMAGE_COMDAT_SELECT_NODUPLICATES:
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OS << "\t.linkonce one_only\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_ANY:
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OS << "\t.linkonce discard\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_SAME_SIZE:
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OS << "\t.linkonce same_size\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH:
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OS << "\t.linkonce same_contents\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE:
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OS << "\t.linkonce associative " << Assoc->getSectionName() << "\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_LARGEST:
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OS << "\t.linkonce largest\n";
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break;
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case COFF::IMAGE_COMDAT_SELECT_NEWEST:
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OS << "\t.linkonce newest\n";
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break;
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default:
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assert (0 && "unsupported COFF selection type");
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break;
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}
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}
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}
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bool MCSectionCOFF::UseCodeAlign() const {
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return getKind().isText();
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}
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bool MCSectionCOFF::isVirtualSection() const {
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return getCharacteristics() & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
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}
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