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 
printCsectDirective(raw_ostream & OS) const18 void MCSectionXCOFF::printCsectDirective(raw_ostream &OS) const {
19   OS << "\t.csect " << QualName->getName() << "," << Log2_32(getAlignment())
20      << '\n';
21 }
22 
PrintSwitchToSection(const MCAsmInfo & MAI,const Triple & T,raw_ostream & OS,const MCExpr * Subsection) const23 void MCSectionXCOFF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
24                                           raw_ostream &OS,
25                                           const MCExpr *Subsection) const {
26   if (getKind().isText()) {
27     if (getMappingClass() != XCOFF::XMC_PR)
28       report_fatal_error("Unhandled storage-mapping class for .text csect");
29 
30     printCsectDirective(OS);
31     return;
32   }
33 
34   if (getKind().isReadOnly()) {
35     if (getMappingClass() != XCOFF::XMC_RO)
36       report_fatal_error("Unhandled storage-mapping class for .rodata csect.");
37     printCsectDirective(OS);
38     return;
39   }
40 
41   if (getKind().isData()) {
42     switch (getMappingClass()) {
43     case XCOFF::XMC_RW:
44     case XCOFF::XMC_DS:
45       printCsectDirective(OS);
46       break;
47     case XCOFF::XMC_TC:
48       break;
49     case XCOFF::XMC_TC0:
50       OS << "\t.toc\n";
51       break;
52     default:
53       report_fatal_error(
54           "Unhandled storage-mapping class for .data csect.");
55     }
56     return;
57   }
58 
59   if (getKind().isBSSLocal() || getKind().isCommon()) {
60     assert((getMappingClass() == XCOFF::XMC_RW ||
61             getMappingClass() == XCOFF::XMC_BS) &&
62            "Generated a storage-mapping class for a common/bss csect we don't "
63            "understand how to switch to.");
64     assert(getCSectType() == XCOFF::XTY_CM &&
65            "wrong csect type for .bss csect");
66     // Don't have to print a directive for switching to section for commons.
67     // '.comm' and '.lcomm' directives for the variable will create the needed
68     // csect.
69     return;
70   }
71 
72   report_fatal_error("Printing for this SectionKind is unimplemented.");
73 }
74 
UseCodeAlign() const75 bool MCSectionXCOFF::UseCodeAlign() const { return getKind().isText(); }
76 
isVirtualSection() const77 bool MCSectionXCOFF::isVirtualSection() const { return XCOFF::XTY_CM == Type; }
78