lib/MC/MCParser/ELFAsmParser.cpp

   1 //===- ELFAsmParser.cpp - ELF Assembly Parser -----------------------------===//
   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/MCParser/MCAsmParserExtension.h"
  11 #include "llvm/MC/MCSectionELF.h"
  12 #include "llvm/MC/MCContext.h"
  13 #include "llvm/MC/MCStreamer.h"
  14 #include "llvm/MC/MCParser/MCAsmLexer.h"
  15 using namespace llvm;
  16
  17 namespace {
  18
  19 class ELFAsmParser : public MCAsmParserExtension {
  20   bool ParseSectionSwitch(StringRef Section, unsigned Type,
  21                           unsigned Flags, SectionKind Kind);
  22
  23 public:
  24   ELFAsmParser() {}
  25
  26   virtual void Initialize(MCAsmParser &Parser) {
  27     // Call the base implementation.
  28     this->MCAsmParserExtension::Initialize(Parser);
  29
  30     Parser.AddDirectiveHandler(this, ".data", MCAsmParser::DirectiveHandler(
  31                                  &ELFAsmParser::ParseSectionDirectiveData));
  32     Parser.AddDirectiveHandler(this, ".text", MCAsmParser::DirectiveHandler(
  33                                  &ELFAsmParser::ParseSectionDirectiveText));
  34   }
  35
  36   bool ParseSectionDirectiveData(StringRef, SMLoc) {
  37     return ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
  38                               MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
  39                               SectionKind::getDataRel());
  40   }
  41   bool ParseSectionDirectiveText(StringRef, SMLoc) {
  42     return ParseSectionSwitch(".text", MCSectionELF::SHT_PROGBITS,
  43                               MCSectionELF::SHF_EXECINSTR |
  44                               MCSectionELF::SHF_ALLOC, SectionKind::getText());
  45   }
  46 };
  47
  48 }
  49
  50 bool ELFAsmParser::ParseSectionSwitch(StringRef Section, unsigned Type,
  51                                       unsigned Flags, SectionKind Kind) {
  52   if (getLexer().isNot(AsmToken::EndOfStatement))
  53     return TokError("unexpected token in section switching directive");
  54   Lex();
  55
  56   getStreamer().SwitchSection(getContext().getELFSection(
  57                                 Section, Type, Flags, Kind));
  58
  59   return false;
  60 }
  61
  62 namespace llvm {
  63
  64 MCAsmParserExtension *createELFAsmParser() {
  65   return new ELFAsmParser;
  66 }
  67
  68 }