1 //===- lib/MC/MCSectionWasm.cpp - Wasm 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/MCSectionWasm.h"
10 #include "llvm/MC/MCAsmInfo.h"
11 #include "llvm/MC/MCExpr.h"
12 #include "llvm/MC/MCSymbol.h"
13 #include "llvm/MC/MCSymbolWasm.h"
14 #include "llvm/Support/raw_ostream.h"
15
16 using namespace llvm;
17
18 // Decides whether a '.section' directive
19 // should be printed before the section name.
shouldOmitSectionDirective(StringRef Name,const MCAsmInfo & MAI) const20 bool MCSectionWasm::shouldOmitSectionDirective(StringRef Name,
21 const MCAsmInfo &MAI) const {
22 return MAI.shouldOmitSectionDirective(Name);
23 }
24
printName(raw_ostream & OS,StringRef Name)25 static void printName(raw_ostream &OS, StringRef Name) {
26 if (Name.find_first_not_of("0123456789_."
27 "abcdefghijklmnopqrstuvwxyz"
28 "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
29 OS << Name;
30 return;
31 }
32 OS << '"';
33 for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
34 if (*B == '"') // Unquoted "
35 OS << "\\\"";
36 else if (*B != '\\') // Neither " or backslash
37 OS << *B;
38 else if (B + 1 == E) // Trailing backslash
39 OS << "\\\\";
40 else {
41 OS << B[0] << B[1]; // Quoted character
42 ++B;
43 }
44 }
45 OS << '"';
46 }
47
PrintSwitchToSection(const MCAsmInfo & MAI,const Triple & T,raw_ostream & OS,const MCExpr * Subsection) const48 void MCSectionWasm::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
49 raw_ostream &OS,
50 const MCExpr *Subsection) const {
51
52 if (shouldOmitSectionDirective(getName(), MAI)) {
53 OS << '\t' << getName();
54 if (Subsection) {
55 OS << '\t';
56 Subsection->print(OS, &MAI);
57 }
58 OS << '\n';
59 return;
60 }
61
62 OS << "\t.section\t";
63 printName(OS, getName());
64 OS << ",\"";
65
66 if (IsPassive)
67 OS << 'p';
68 if (Group)
69 OS << 'G';
70 if (SegmentFlags & wasm::WASM_SEG_FLAG_STRINGS)
71 OS << 'S';
72 if (SegmentFlags & wasm::WASM_SEG_FLAG_TLS)
73 OS << 'T';
74
75 OS << '"';
76
77 OS << ',';
78
79 // If comment string is '@', e.g. as on ARM - use '%' instead
80 if (MAI.getCommentString()[0] == '@')
81 OS << '%';
82 else
83 OS << '@';
84
85 // TODO: Print section type.
86
87 if (Group) {
88 OS << ",";
89 printName(OS, Group->getName());
90 OS << ",comdat";
91 }
92
93 if (isUnique())
94 OS << ",unique," << UniqueID;
95
96 OS << '\n';
97
98 if (Subsection) {
99 OS << "\t.subsection\t";
100 Subsection->print(OS, &MAI);
101 OS << '\n';
102 }
103 }
104
UseCodeAlign() const105 bool MCSectionWasm::UseCodeAlign() const { return false; }
106
isVirtualSection() const107 bool MCSectionWasm::isVirtualSection() const { return false; }
108