xref: /freebsd/contrib/llvm-project/llvm/lib/MC/MCSectionXCOFF.cpp (revision 85868e8a1daeaae7a0e48effb2ea2310ae3b02c6)
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; }
80