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//===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements the parser for assembly files.
//
//===----------------------------------------------------------------------===//
#include "AsmParser.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
bool AsmParser::Error(SMLoc L, const char *Msg) {
Lexer.PrintMessage(L, Msg);
return true;
}
bool AsmParser::TokError(const char *Msg) {
Lexer.PrintMessage(Lexer.getLoc(), Msg);
return true;
}
bool AsmParser::Run() {
// Prime the lexer.
Lexer.Lex();
while (Lexer.isNot(asmtok::Eof))
if (ParseStatement())
return true;
return false;
}
/// ParseStatement:
/// ::= EndOfStatement
/// ::= Label* Identifier Operands* EndOfStatement
bool AsmParser::ParseStatement() {
switch (Lexer.getKind()) {
default:
return TokError("unexpected token at start of statement");
case asmtok::EndOfStatement:
Lexer.Lex();
return false;
case asmtok::Identifier:
break;
// TODO: Recurse on local labels etc.
}
// If we have an identifier, handle it as the key symbol.
//SMLoc IDLoc = Lexer.getLoc();
std::string IDVal = Lexer.getCurStrVal();
// Consume the identifier, see what is after it.
if (Lexer.Lex() == asmtok::Colon) {
// identifier ':' -> Label.
Lexer.Lex();
return ParseStatement();
}
// Otherwise, we have a normal instruction or directive.
if (IDVal[0] == '.')
outs() << "Found directive: " << IDVal << "\n";
else
outs() << "Found instruction: " << IDVal << "\n";
// Skip to end of line for now.
while (Lexer.isNot(asmtok::EndOfStatement) &&
Lexer.isNot(asmtok::Eof))
Lexer.Lex();
// Eat EOL.
if (Lexer.is(asmtok::EndOfStatement))
Lexer.Lex();
return false;
}
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