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