lib/MC/MCSectionWasm.cpp

   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; }