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https://github.com/c64scene-ar/llvm-6502.git
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924c5e58f2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104316 91177308-0d34-0410-b5e6-96231b3b80d8
334 lines
11 KiB
C++
334 lines
11 KiB
C++
//===- AsmLexer.cpp - Lexer for Assembly Files ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements the lexer for assembly files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCParser/AsmLexer.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include <cerrno>
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#include <cstdio>
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#include <cstdlib>
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using namespace llvm;
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AsmLexer::AsmLexer(const MCAsmInfo &_MAI) : MAI(_MAI) {
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CurBuf = NULL;
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CurPtr = NULL;
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TokStart = 0;
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}
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AsmLexer::~AsmLexer() {
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}
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void AsmLexer::setBuffer(const MemoryBuffer *buf, const char *ptr) {
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CurBuf = buf;
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if (ptr)
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CurPtr = ptr;
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else
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CurPtr = CurBuf->getBufferStart();
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TokStart = 0;
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}
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SMLoc AsmLexer::getLoc() const {
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return SMLoc::getFromPointer(TokStart);
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}
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/// ReturnError - Set the error to the specified string at the specified
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/// location. This is defined to always return AsmToken::Error.
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AsmToken AsmLexer::ReturnError(const char *Loc, const std::string &Msg) {
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SetError(SMLoc::getFromPointer(Loc), Msg);
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return AsmToken(AsmToken::Error, StringRef(Loc, 0));
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}
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int AsmLexer::getNextChar() {
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char CurChar = *CurPtr++;
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switch (CurChar) {
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default:
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return (unsigned char)CurChar;
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case 0:
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// A nul character in the stream is either the end of the current buffer or
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// a random nul in the file. Disambiguate that here.
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if (CurPtr-1 != CurBuf->getBufferEnd())
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return 0; // Just whitespace.
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// Otherwise, return end of file.
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--CurPtr; // Another call to lex will return EOF again.
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return EOF;
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}
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}
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/// LexIdentifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
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AsmToken AsmLexer::LexIdentifier() {
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while (isalnum(*CurPtr) || *CurPtr == '_' || *CurPtr == '$' ||
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*CurPtr == '.' || *CurPtr == '@')
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++CurPtr;
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// Handle . as a special case.
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if (CurPtr == TokStart+1 && TokStart[0] == '.')
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return AsmToken(AsmToken::Dot, StringRef(TokStart, 1));
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return AsmToken(AsmToken::Identifier, StringRef(TokStart, CurPtr - TokStart));
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}
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/// LexSlash: Slash: /
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/// C-Style Comment: /* ... */
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AsmToken AsmLexer::LexSlash() {
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switch (*CurPtr) {
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case '*': break; // C style comment.
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case '/': return ++CurPtr, LexLineComment();
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default: return AsmToken(AsmToken::Slash, StringRef(CurPtr, 1));
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}
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// C Style comment.
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++CurPtr; // skip the star.
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while (1) {
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int CurChar = getNextChar();
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switch (CurChar) {
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case EOF:
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return ReturnError(TokStart, "unterminated comment");
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case '*':
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// End of the comment?
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if (CurPtr[0] != '/') break;
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++CurPtr; // End the */.
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return LexToken();
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}
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}
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}
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/// LexLineComment: Comment: #[^\n]*
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/// : //[^\n]*
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AsmToken AsmLexer::LexLineComment() {
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// FIXME: This is broken if we happen to a comment at the end of a file, which
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// was .included, and which doesn't end with a newline.
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int CurChar = getNextChar();
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while (CurChar != '\n' && CurChar != '\n' && CurChar != EOF)
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CurChar = getNextChar();
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if (CurChar == EOF)
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return AsmToken(AsmToken::Eof, StringRef(CurPtr, 0));
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return AsmToken(AsmToken::EndOfStatement, StringRef(CurPtr, 0));
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}
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/// LexDigit: First character is [0-9].
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/// Local Label: [0-9][:]
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/// Forward/Backward Label: [0-9][fb]
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/// Binary integer: 0b[01]+
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/// Octal integer: 0[0-7]+
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/// Hex integer: 0x[0-9a-fA-F]+
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/// Decimal integer: [1-9][0-9]*
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/// TODO: FP literal.
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AsmToken AsmLexer::LexDigit() {
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// Decimal integer: [1-9][0-9]*
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if (CurPtr[-1] != '0') {
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while (isdigit(*CurPtr))
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++CurPtr;
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StringRef Result(TokStart, CurPtr - TokStart);
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long long Value;
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if (Result.getAsInteger(10, Value)) {
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// We have to handle minint_as_a_positive_value specially, because
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// - minint_as_a_positive_value = minint and it is valid.
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if (Result == "9223372036854775808")
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Value = -9223372036854775808ULL;
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else
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return ReturnError(TokStart, "Invalid decimal number");
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}
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return AsmToken(AsmToken::Integer, Result, Value);
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}
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if (*CurPtr == 'b') {
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++CurPtr;
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// See if we actually have "0b" as part of something like "jmp 0b\n"
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if (!isdigit(CurPtr[0])) {
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--CurPtr;
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StringRef Result(TokStart, CurPtr - TokStart);
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return AsmToken(AsmToken::Integer, Result, 0);
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}
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const char *NumStart = CurPtr;
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while (CurPtr[0] == '0' || CurPtr[0] == '1')
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++CurPtr;
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// Requires at least one binary digit.
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if (CurPtr == NumStart)
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return ReturnError(TokStart, "Invalid binary number");
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StringRef Result(TokStart, CurPtr - TokStart);
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long long Value;
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if (Result.getAsInteger(2, Value))
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return ReturnError(TokStart, "Invalid binary number");
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return AsmToken(AsmToken::Integer, Result, Value);
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}
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if (*CurPtr == 'x') {
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++CurPtr;
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const char *NumStart = CurPtr;
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while (isxdigit(CurPtr[0]))
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++CurPtr;
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// Requires at least one hex digit.
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if (CurPtr == NumStart)
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return ReturnError(CurPtr-2, "Invalid hexadecimal number");
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unsigned long long Result;
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if (StringRef(TokStart, CurPtr - TokStart).getAsInteger(0, Result))
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return ReturnError(TokStart, "Invalid hexadecimal number");
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return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
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(int64_t)Result);
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}
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// Must be an octal number, it starts with 0.
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while (*CurPtr >= '0' && *CurPtr <= '7')
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++CurPtr;
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StringRef Result(TokStart, CurPtr - TokStart);
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long long Value;
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if (Result.getAsInteger(8, Value))
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return ReturnError(TokStart, "Invalid octal number");
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return AsmToken(AsmToken::Integer, Result, Value);
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}
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/// LexQuote: String: "..."
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AsmToken AsmLexer::LexQuote() {
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int CurChar = getNextChar();
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// TODO: does gas allow multiline string constants?
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while (CurChar != '"') {
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if (CurChar == '\\') {
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// Allow \", etc.
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CurChar = getNextChar();
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}
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if (CurChar == EOF)
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return ReturnError(TokStart, "unterminated string constant");
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CurChar = getNextChar();
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}
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return AsmToken(AsmToken::String, StringRef(TokStart, CurPtr - TokStart));
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}
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StringRef AsmLexer::LexUntilEndOfStatement() {
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TokStart = CurPtr;
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while (!isAtStartOfComment(*CurPtr) && // Start of line comment.
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*CurPtr != ';' && // End of statement marker.
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*CurPtr != '\n' &&
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*CurPtr != '\r' &&
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(*CurPtr != 0 || CurPtr != CurBuf->getBufferEnd())) {
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++CurPtr;
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}
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return StringRef(TokStart, CurPtr-TokStart);
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}
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bool AsmLexer::isAtStartOfComment(char Char) {
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// FIXME: This won't work for multi-character comment indicators like "//".
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return Char == *MAI.getCommentString();
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}
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AsmToken AsmLexer::LexToken() {
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TokStart = CurPtr;
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// This always consumes at least one character.
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int CurChar = getNextChar();
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if (isAtStartOfComment(CurChar))
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return LexLineComment();
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switch (CurChar) {
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default:
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// Handle identifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
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if (isalpha(CurChar) || CurChar == '_' || CurChar == '.')
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return LexIdentifier();
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// Unknown character, emit an error.
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return ReturnError(TokStart, "invalid character in input");
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case EOF: return AsmToken(AsmToken::Eof, StringRef(TokStart, 0));
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case 0:
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case ' ':
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case '\t':
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// Ignore whitespace.
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return LexToken();
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case '\n': // FALL THROUGH.
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case '\r': // FALL THROUGH.
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case ';': return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
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case ':': return AsmToken(AsmToken::Colon, StringRef(TokStart, 1));
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case '+': return AsmToken(AsmToken::Plus, StringRef(TokStart, 1));
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case '-': return AsmToken(AsmToken::Minus, StringRef(TokStart, 1));
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case '~': return AsmToken(AsmToken::Tilde, StringRef(TokStart, 1));
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case '(': return AsmToken(AsmToken::LParen, StringRef(TokStart, 1));
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case ')': return AsmToken(AsmToken::RParen, StringRef(TokStart, 1));
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case '[': return AsmToken(AsmToken::LBrac, StringRef(TokStart, 1));
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case ']': return AsmToken(AsmToken::RBrac, StringRef(TokStart, 1));
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case '{': return AsmToken(AsmToken::LCurly, StringRef(TokStart, 1));
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case '}': return AsmToken(AsmToken::RCurly, StringRef(TokStart, 1));
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case '*': return AsmToken(AsmToken::Star, StringRef(TokStart, 1));
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case ',': return AsmToken(AsmToken::Comma, StringRef(TokStart, 1));
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case '$': return AsmToken(AsmToken::Dollar, StringRef(TokStart, 1));
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case '@': return AsmToken(AsmToken::At, StringRef(TokStart, 1));
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case '=':
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if (*CurPtr == '=')
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return ++CurPtr, AsmToken(AsmToken::EqualEqual, StringRef(TokStart, 2));
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return AsmToken(AsmToken::Equal, StringRef(TokStart, 1));
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case '|':
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if (*CurPtr == '|')
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return ++CurPtr, AsmToken(AsmToken::PipePipe, StringRef(TokStart, 2));
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return AsmToken(AsmToken::Pipe, StringRef(TokStart, 1));
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case '^': return AsmToken(AsmToken::Caret, StringRef(TokStart, 1));
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case '&':
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if (*CurPtr == '&')
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return ++CurPtr, AsmToken(AsmToken::AmpAmp, StringRef(TokStart, 2));
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return AsmToken(AsmToken::Amp, StringRef(TokStart, 1));
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case '!':
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if (*CurPtr == '=')
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return ++CurPtr, AsmToken(AsmToken::ExclaimEqual, StringRef(TokStart, 2));
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return AsmToken(AsmToken::Exclaim, StringRef(TokStart, 1));
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case '%': return AsmToken(AsmToken::Percent, StringRef(TokStart, 1));
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case '/': return LexSlash();
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case '#': return AsmToken(AsmToken::Hash, StringRef(TokStart, 1));
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case '"': return LexQuote();
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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return LexDigit();
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case '<':
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switch (*CurPtr) {
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case '<': return ++CurPtr, AsmToken(AsmToken::LessLess,
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StringRef(TokStart, 2));
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case '=': return ++CurPtr, AsmToken(AsmToken::LessEqual,
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StringRef(TokStart, 2));
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case '>': return ++CurPtr, AsmToken(AsmToken::LessGreater,
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StringRef(TokStart, 2));
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default: return AsmToken(AsmToken::Less, StringRef(TokStart, 1));
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}
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case '>':
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switch (*CurPtr) {
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case '>': return ++CurPtr, AsmToken(AsmToken::GreaterGreater,
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StringRef(TokStart, 2));
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case '=': return ++CurPtr, AsmToken(AsmToken::GreaterEqual,
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StringRef(TokStart, 2));
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default: return AsmToken(AsmToken::Greater, StringRef(TokStart, 1));
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}
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// TODO: Quoted identifiers (objc methods etc)
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// local labels: [0-9][:]
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// Forward/backward labels: [0-9][fb]
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// Integers, fp constants, character constants.
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}
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}
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