MC/AsmParser: Move ELF specific parser to ELFAsmParser.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108196 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 68 insertions, 0 deletions

diff --git a/lib/MC/MCParser/ELFAsmParser.cpp b/lib/MC/MCParser/ELFAsmParser.cpp
new file mode 100644
index 0000000000..7a54dd39aa
--- /dev/null
+++ b/lib/MC/MCParser/ELFAsmParser.cpp
@@ -0,0 +1,68 @@
+//===- ELFAsmParser.cpp - ELF Assembly Parser -----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCParser/MCAsmParserExtension.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCParser/MCAsmLexer.h"
+using namespace llvm;
+
+namespace {
+
+class ELFAsmParser : public MCAsmParserExtension {
+  bool ParseSectionSwitch(StringRef Section, unsigned Type,
+                          unsigned Flags, SectionKind Kind);
+
+public:
+  ELFAsmParser() {}
+
+  virtual void Initialize(MCAsmParser &Parser) {
+    // Call the base implementation.
+    this->MCAsmParserExtension::Initialize(Parser);
+
+    Parser.AddDirectiveHandler(this, ".data", MCAsmParser::DirectiveHandler(
+                                 &ELFAsmParser::ParseSectionDirectiveData));
+    Parser.AddDirectiveHandler(this, ".text", MCAsmParser::DirectiveHandler(
+                                 &ELFAsmParser::ParseSectionDirectiveText));
+  }
+
+  bool ParseSectionDirectiveData(StringRef, SMLoc) {
+    return ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
+                              MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
+                              SectionKind::getDataRel());
+  }
+  bool ParseSectionDirectiveText(StringRef, SMLoc) {
+    return ParseSectionSwitch(".text", MCSectionELF::SHT_PROGBITS,
+                              MCSectionELF::SHF_EXECINSTR |
+                              MCSectionELF::SHF_ALLOC, SectionKind::getText());
+  }
+};
+
+}
+
+bool ELFAsmParser::ParseSectionSwitch(StringRef Section, unsigned Type,
+                                      unsigned Flags, SectionKind Kind) {
+  if (getLexer().isNot(AsmToken::EndOfStatement))
+    return TokError("unexpected token in section switching directive");
+  Lex();
+
+  getStreamer().SwitchSection(getContext().getELFSection(
+                                Section, Type, Flags, Kind));
+
+  return false;
+}
+
+namespace llvm {
+
+MCAsmParserExtension *createELFAsmParser() {
+  return new ELFAsmParser;
+}
+
+}