MCSectionXCOFF.cpp revision 360784 
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
14using namespace llvm;
15
16MCSectionXCOFF::~MCSectionXCOFF() = default;
17
18
19void MCSectionXCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
20                                          raw_ostream &OS,
21                                          const MCExpr *Subsection) const {
22  if (getKind().isText()) {
23    if (getMappingClass() != XCOFF::XMC_PR)
24      report_fatal_error("Unhandled storage-mapping class for .text csect");
25
26    OS << "\t.csect " << QualName->getName() << '\n';
27    return;
28  }
29
30  if (getKind().isReadOnly()) {
31    if (getMappingClass() != XCOFF::XMC_RO)
32      report_fatal_error("Unhandled storage-mapping class for .rodata csect.");
33    OS << "\t.csect " << QualName->getName() << '\n';
34    return;
35  }
36
37  if (getKind().isData()) {
38    switch (getMappingClass()) {
39    case XCOFF::XMC_RW:
40    case XCOFF::XMC_DS:
41      OS << "\t.csect " << QualName->getName() << '\n';
42      break;
43    case XCOFF::XMC_TC:
44      break;
45    case XCOFF::XMC_TC0:
46      OS << "\t.toc\n";
47      break;
48    default:
49      report_fatal_error(
50          "Unhandled storage-mapping class for .data csect.");
51    }
52    return;
53  }
54
55  if (getKind().isBSSLocal() || getKind().isCommon()) {
56    assert((getMappingClass() == XCOFF::XMC_RW ||
57            getMappingClass() == XCOFF::XMC_BS) &&
58           "Generated a storage-mapping class for a common/bss csect we don't "
59           "understand how to switch to.");
60    assert(getCSectType() == XCOFF::XTY_CM &&
61           "wrong csect type for .bss csect");
62    // Don't have to print a directive for switching to section for commons.
63    // '.comm' and '.lcomm' directives for the variable will create the needed
64    // csect.
65    return;
66  }
67
68  report_fatal_error("Printing for this SectionKind is unimplemented.");
69}
70
71bool MCSectionXCOFF::UseCodeAlign() const { return getKind().isText(); }
72
73bool MCSectionXCOFF::isVirtualSection() const { return XCOFF::XTY_CM == Type; }
74