lib/MC/MCSectionXCOFF.cpp

   1 //===- lib/MC/MCSectionXCOFF.cpp - XCOFF Code Section Representation ------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/MC/MCSectionXCOFF.h"
  10 #include "llvm/MC/MCAsmInfo.h"
  11 #include "llvm/MC/MCExpr.h"
  12 #include "llvm/Support/raw_ostream.h"
  13
  14 using namespace llvm;
  15
  16 MCSectionXCOFF::~MCSectionXCOFF() = default;
  17
  18 static StringRef getMappingClassString(XCOFF::StorageMappingClass SMC) {
  19   switch (SMC) {
  20   case XCOFF::XMC_DS:
  21     return "DS";
  22   case XCOFF::XMC_RW:
  23     return "RW";
  24   case XCOFF::XMC_PR:
  25     return "PR";
  26   default:
  27     report_fatal_error("Unhandled storage-mapping class.");
  28   }
  29 }
  30
  31 void MCSectionXCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
  32                                           raw_ostream &OS,
  33                                           const MCExpr *Subsection) const {
  34   if (getKind().isText()) {
  35     if (getMappingClass() != XCOFF::XMC_PR)
  36       report_fatal_error("Unhandled storage-mapping class for .text csect");
  37
  38     OS << "\t.csect " << getSectionName() << "["
  39        << getMappingClassString(getMappingClass())
  40        << "]" << '\n';
  41     return;
  42   }
  43
  44   if (getKind().isData()) {
  45     switch (getMappingClass()) {
  46     case XCOFF::XMC_RW:
  47     case XCOFF::XMC_DS:
  48       OS << "\t.csect " << getSectionName() << "["
  49          << getMappingClassString(getMappingClass()) << "]" << '\n';
  50       break;
  51     case XCOFF::XMC_TC0:
  52       OS << "\t.toc\n";
  53       break;
  54     default:
  55       report_fatal_error(
  56           "Unhandled storage-mapping class for .data csect.");
  57     }
  58     return;
  59   }
  60
  61   if (getKind().isBSSLocal() || getKind().isCommon()) {
  62     assert((getMappingClass() == XCOFF::XMC_RW ||
  63             getMappingClass() == XCOFF::XMC_BS) &&
  64            "Generated a storage-mapping class for a common/bss csect we don't "
  65            "understand how to switch to.");
  66     assert(getCSectType() == XCOFF::XTY_CM &&
  67            "wrong csect type for .bss csect");
  68     // Don't have to print a directive for switching to section for commons.
  69     // '.comm' and '.lcomm' directives for the variable will create the needed
  70     // csect.
  71     return;
  72   }
  73
  74   report_fatal_error("Printing for this SectionKind is unimplemented.");
  75 }
  76
  77 bool MCSectionXCOFF::UseCodeAlign() const { return getKind().isText(); }
  78
  79 bool MCSectionXCOFF::isVirtualSection() const { return XCOFF::XTY_CM == Type; }