llvm/lib/MC/MCSectionWasm.cpp

   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; }