xref: /freebsd/contrib/llvm-project/llvm/lib/MC/MCSectionWasm.cpp (revision ec0ea6efa1ad229d75c394c1a9b9cac33af2b1d3)
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.
20 bool MCSectionWasm::shouldOmitSectionDirective(StringRef Name,
21                                                const MCAsmInfo &MAI) const {
22   return MAI.shouldOmitSectionDirective(Name);
23 }
24 
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 
48 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 
105 bool MCSectionWasm::UseCodeAlign() const { return false; }
106 
107 bool MCSectionWasm::isVirtualSection() const { return false; }
108