1 //===- lib/MC/MCSectionWasm.cpp - Wasm Code Section Representation --------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/MC/MCSectionWasm.h"
11 #include "llvm/MC/MCAsmInfo.h"
12 #include "llvm/MC/MCExpr.h"
13 #include "llvm/MC/MCSymbol.h"
14 #include "llvm/Support/raw_ostream.h"
15 
16 using namespace llvm;
17 
18 MCSectionWasm::~MCSectionWasm() {} // anchor.
19 
20 // Decides whether a '.section' directive
21 // should be printed before the section name.
22 bool MCSectionWasm::ShouldOmitSectionDirective(StringRef Name,
23                                                const MCAsmInfo &MAI) const {
24   return MAI.shouldOmitSectionDirective(Name);
25 }
26 
27 static void printName(raw_ostream &OS, StringRef Name) {
28   if (Name.find_first_not_of("0123456789_."
29                              "abcdefghijklmnopqrstuvwxyz"
30                              "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
31     OS << Name;
32     return;
33   }
34   OS << '"';
35   for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
36     if (*B == '"') // Unquoted "
37       OS << "\\\"";
38     else if (*B != '\\') // Neither " or backslash
39       OS << *B;
40     else if (B + 1 == E) // Trailing backslash
41       OS << "\\\\";
42     else {
43       OS << B[0] << B[1]; // Quoted character
44       ++B;
45     }
46   }
47   OS << '"';
48 }
49 
50 void MCSectionWasm::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
51                                          raw_ostream &OS,
52                                          const MCExpr *Subsection) const {
53 
54   if (ShouldOmitSectionDirective(SectionName, MAI)) {
55     OS << '\t' << getSectionName();
56     if (Subsection) {
57       OS << '\t';
58       Subsection->print(OS, &MAI);
59     }
60     OS << '\n';
61     return;
62   }
63 
64   OS << "\t.section\t";
65   printName(OS, getSectionName());
66   OS << ",\"";
67 
68   // TODO: Print section flags.
69 
70   OS << '"';
71 
72   OS << ',';
73 
74   // If comment string is '@', e.g. as on ARM - use '%' instead
75   if (MAI.getCommentString()[0] == '@')
76     OS << '%';
77   else
78     OS << '@';
79 
80   // TODO: Print section type.
81 
82   if (isUnique())
83     OS << ",unique," << UniqueID;
84 
85   OS << '\n';
86 
87   if (Subsection) {
88     OS << "\t.subsection\t";
89     Subsection->print(OS, &MAI);
90     OS << '\n';
91   }
92 }
93 
94 bool MCSectionWasm::UseCodeAlign() const { return false; }
95 
96 bool MCSectionWasm::isVirtualSection() const { return false; }
97