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/MCSymbolWasm.h"
  13 #include "llvm/Support/raw_ostream.h"
  14
  15 using namespace llvm;
  16
  17 // Decides whether a '.section' directive
  18 // should be printed before the section name.
  19 bool MCSectionWasm::shouldOmitSectionDirective(StringRef Name,
  20                                                const MCAsmInfo &MAI) const {
  21   return MAI.shouldOmitSectionDirective(Name);
  22 }
  23
  24 static void printName(raw_ostream &OS, StringRef Name) {
  25   if (Name.find_first_not_of("0123456789_."
  26                              "abcdefghijklmnopqrstuvwxyz"
  27                              "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
  28     OS << Name;
  29     return;
  30   }
  31   OS << '"';
  32   for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
  33     if (*B == '"') // Unquoted "
  34       OS << "\\\"";
  35     else if (*B != '\\') // Neither " or backslash
  36       OS << *B;
  37     else if (B + 1 == E) // Trailing backslash
  38       OS << "\\\\";
  39     else {
  40       OS << B[0] << B[1]; // Quoted character
  41       ++B;
  42     }
  43   }
  44   OS << '"';
  45 }
  46
  47 void MCSectionWasm::printSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
  48                                          raw_ostream &OS,
  49                                          uint32_t Subsection) const {
  50
  51   if (shouldOmitSectionDirective(getName(), MAI)) {
  52     OS << '\t' << getName();
  53     if (Subsection)
  54       OS << '\t' << Subsection;
  55     OS << '\n';
  56     return;
  57   }
  58
  59   OS << "\t.section\t";
  60   printName(OS, getName());
  61   OS << ",\"";
  62
  63   if (IsPassive)
  64     OS << 'p';
  65   if (Group)
  66     OS << 'G';
  67   if (SegmentFlags & wasm::WASM_SEG_FLAG_STRINGS)
  68     OS << 'S';
  69   if (SegmentFlags & wasm::WASM_SEG_FLAG_TLS)
  70     OS << 'T';
  71   if (SegmentFlags & wasm::WASM_SEG_FLAG_RETAIN)
  72     OS << 'R';
  73
  74   OS << '"';
  75
  76   OS << ',';
  77
  78   // If comment string is '@', e.g. as on ARM - use '%' instead
  79   if (MAI.getCommentString()[0] == '@')
  80     OS << '%';
  81   else
  82     OS << '@';
  83
  84   // TODO: Print section type.
  85
  86   if (Group) {
  87     OS << ",";
  88     printName(OS, Group->getName());
  89     OS << ",comdat";
  90   }
  91
  92   if (isUnique())
  93     OS << ",unique," << UniqueID;
  94
  95   OS << '\n';
  96
  97   if (Subsection)
  98     OS << "\t.subsection\t" << Subsection << '\n';
  99 }
 100
 101 bool MCSectionWasm::useCodeAlign() const { return false; }