mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
cec545097c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82911 91177308-0d34-0410-b5e6-96231b3b80d8
337 lines
11 KiB
C++
337 lines
11 KiB
C++
//===- AsmLexer.cpp - Lexer 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 lexer for assembly files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AsmLexer.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Config/config.h" // for strtoull.
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include <cerrno>
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
using namespace llvm;
|
|
|
|
AsmLexer::AsmLexer(SourceMgr &SM, const MCAsmInfo &_MAI) : SrcMgr(SM),
|
|
MAI(_MAI) {
|
|
CurBuffer = 0;
|
|
CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
|
|
CurPtr = CurBuf->getBufferStart();
|
|
TokStart = 0;
|
|
}
|
|
|
|
AsmLexer::~AsmLexer() {
|
|
}
|
|
|
|
SMLoc AsmLexer::getLoc() const {
|
|
return SMLoc::getFromPointer(TokStart);
|
|
}
|
|
|
|
void AsmLexer::PrintMessage(SMLoc Loc, const std::string &Msg,
|
|
const char *Type) const {
|
|
SrcMgr.PrintMessage(Loc, Msg, Type);
|
|
}
|
|
|
|
/// ReturnError - Set the error to the specified string at the specified
|
|
/// location. This is defined to always return AsmToken::Error.
|
|
AsmToken AsmLexer::ReturnError(const char *Loc, const std::string &Msg) {
|
|
SrcMgr.PrintMessage(SMLoc::getFromPointer(Loc), Msg, "error");
|
|
return AsmToken(AsmToken::Error, StringRef(Loc, 0));
|
|
}
|
|
|
|
/// EnterIncludeFile - Enter the specified file. This prints an error and
|
|
/// returns true on failure.
|
|
bool AsmLexer::EnterIncludeFile(const std::string &Filename) {
|
|
int NewBuf = SrcMgr.AddIncludeFile(Filename, SMLoc::getFromPointer(CurPtr));
|
|
if (NewBuf == -1)
|
|
return true;
|
|
|
|
// Save the line number and lex buffer of the includer.
|
|
CurBuffer = NewBuf;
|
|
CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
|
|
CurPtr = CurBuf->getBufferStart();
|
|
return false;
|
|
}
|
|
|
|
|
|
int AsmLexer::getNextChar() {
|
|
char CurChar = *CurPtr++;
|
|
switch (CurChar) {
|
|
default:
|
|
return (unsigned char)CurChar;
|
|
case 0: {
|
|
// A nul character in the stream is either the end of the current buffer or
|
|
// a random nul in the file. Disambiguate that here.
|
|
if (CurPtr-1 != CurBuf->getBufferEnd())
|
|
return 0; // Just whitespace.
|
|
|
|
// If this is the end of an included file, pop the parent file off the
|
|
// include stack.
|
|
SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
|
|
if (ParentIncludeLoc != SMLoc()) {
|
|
CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
|
|
CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
|
|
CurPtr = ParentIncludeLoc.getPointer();
|
|
|
|
// Reset the token start pointer to the start of the new file.
|
|
TokStart = CurPtr;
|
|
|
|
return getNextChar();
|
|
}
|
|
|
|
// Otherwise, return end of file.
|
|
--CurPtr; // Another call to lex will return EOF again.
|
|
return EOF;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// LexIdentifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
|
|
AsmToken AsmLexer::LexIdentifier() {
|
|
while (isalnum(*CurPtr) || *CurPtr == '_' || *CurPtr == '$' ||
|
|
*CurPtr == '.' || *CurPtr == '@')
|
|
++CurPtr;
|
|
return AsmToken(AsmToken::Identifier, StringRef(TokStart, CurPtr - TokStart));
|
|
}
|
|
|
|
/// LexSlash: Slash: /
|
|
/// C-Style Comment: /* ... */
|
|
AsmToken AsmLexer::LexSlash() {
|
|
switch (*CurPtr) {
|
|
case '*': break; // C style comment.
|
|
case '/': return ++CurPtr, LexLineComment();
|
|
default: return AsmToken(AsmToken::Slash, StringRef(CurPtr, 1));
|
|
}
|
|
|
|
// C Style comment.
|
|
++CurPtr; // skip the star.
|
|
while (1) {
|
|
int CurChar = getNextChar();
|
|
switch (CurChar) {
|
|
case EOF:
|
|
return ReturnError(TokStart, "unterminated comment");
|
|
case '*':
|
|
// End of the comment?
|
|
if (CurPtr[0] != '/') break;
|
|
|
|
++CurPtr; // End the */.
|
|
return LexToken();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// LexLineComment: Comment: #[^\n]*
|
|
/// : //[^\n]*
|
|
AsmToken AsmLexer::LexLineComment() {
|
|
// FIXME: This is broken if we happen to a comment at the end of a file, which
|
|
// was .included, and which doesn't end with a newline.
|
|
int CurChar = getNextChar();
|
|
while (CurChar != '\n' && CurChar != '\n' && CurChar != EOF)
|
|
CurChar = getNextChar();
|
|
|
|
if (CurChar == EOF)
|
|
return AsmToken(AsmToken::Eof, StringRef(CurPtr, 0));
|
|
return AsmToken(AsmToken::EndOfStatement, StringRef(CurPtr, 0));
|
|
}
|
|
|
|
|
|
/// LexDigit: First character is [0-9].
|
|
/// Local Label: [0-9][:]
|
|
/// Forward/Backward Label: [0-9][fb]
|
|
/// Binary integer: 0b[01]+
|
|
/// Octal integer: 0[0-7]+
|
|
/// Hex integer: 0x[0-9a-fA-F]+
|
|
/// Decimal integer: [1-9][0-9]*
|
|
/// TODO: FP literal.
|
|
AsmToken AsmLexer::LexDigit() {
|
|
if (*CurPtr == ':')
|
|
return ReturnError(TokStart, "FIXME: local label not implemented");
|
|
if (*CurPtr == 'f' || *CurPtr == 'b')
|
|
return ReturnError(TokStart, "FIXME: directional label not implemented");
|
|
|
|
// Decimal integer: [1-9][0-9]*
|
|
if (CurPtr[-1] != '0') {
|
|
while (isdigit(*CurPtr))
|
|
++CurPtr;
|
|
return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
|
|
strtoll(TokStart, 0, 10));
|
|
}
|
|
|
|
if (*CurPtr == 'b') {
|
|
++CurPtr;
|
|
const char *NumStart = CurPtr;
|
|
while (CurPtr[0] == '0' || CurPtr[0] == '1')
|
|
++CurPtr;
|
|
|
|
// Requires at least one binary digit.
|
|
if (CurPtr == NumStart)
|
|
return ReturnError(CurPtr-2, "Invalid binary number");
|
|
return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
|
|
strtoll(NumStart, 0, 2));
|
|
}
|
|
|
|
if (*CurPtr == 'x') {
|
|
++CurPtr;
|
|
const char *NumStart = CurPtr;
|
|
while (isxdigit(CurPtr[0]))
|
|
++CurPtr;
|
|
|
|
// Requires at least one hex digit.
|
|
if (CurPtr == NumStart)
|
|
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
|
|
|
|
errno = 0;
|
|
if (errno == EINVAL)
|
|
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
|
|
if (errno == ERANGE) {
|
|
errno = 0;
|
|
if (errno == EINVAL)
|
|
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
|
|
if (errno == ERANGE)
|
|
return ReturnError(CurPtr-2, "Hexadecimal number out of range");
|
|
}
|
|
return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
|
|
(int64_t) strtoull(NumStart, 0, 16));
|
|
}
|
|
|
|
// Must be an octal number, it starts with 0.
|
|
while (*CurPtr >= '0' && *CurPtr <= '7')
|
|
++CurPtr;
|
|
return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
|
|
strtoll(TokStart, 0, 8));
|
|
}
|
|
|
|
/// LexQuote: String: "..."
|
|
AsmToken AsmLexer::LexQuote() {
|
|
int CurChar = getNextChar();
|
|
// TODO: does gas allow multiline string constants?
|
|
while (CurChar != '"') {
|
|
if (CurChar == '\\') {
|
|
// Allow \", etc.
|
|
CurChar = getNextChar();
|
|
}
|
|
|
|
if (CurChar == EOF)
|
|
return ReturnError(TokStart, "unterminated string constant");
|
|
|
|
CurChar = getNextChar();
|
|
}
|
|
|
|
return AsmToken(AsmToken::String, StringRef(TokStart, CurPtr - TokStart));
|
|
}
|
|
|
|
StringRef AsmLexer::LexUntilEndOfStatement() {
|
|
TokStart = CurPtr;
|
|
|
|
while (!isAtStartOfComment(*CurPtr) && // Start of line comment.
|
|
*CurPtr != ';' && // End of statement marker.
|
|
*CurPtr != '\n' &&
|
|
*CurPtr != '\r' &&
|
|
(*CurPtr != 0 || CurPtr != CurBuf->getBufferEnd())) {
|
|
++CurPtr;
|
|
}
|
|
return StringRef(TokStart, CurPtr-TokStart);
|
|
}
|
|
|
|
bool AsmLexer::isAtStartOfComment(char Char) {
|
|
// FIXME: This won't work for multi-character comment indicators like "//".
|
|
return Char == *MAI.getCommentString();
|
|
}
|
|
|
|
AsmToken AsmLexer::LexToken() {
|
|
TokStart = CurPtr;
|
|
// This always consumes at least one character.
|
|
int CurChar = getNextChar();
|
|
|
|
if (isAtStartOfComment(CurChar))
|
|
return LexLineComment();
|
|
|
|
switch (CurChar) {
|
|
default:
|
|
// Handle identifier: [a-zA-Z_.][a-zA-Z0-9_$.@]*
|
|
if (isalpha(CurChar) || CurChar == '_' || CurChar == '.')
|
|
return LexIdentifier();
|
|
|
|
// Unknown character, emit an error.
|
|
return ReturnError(TokStart, "invalid character in input");
|
|
case EOF: return AsmToken(AsmToken::Eof, StringRef(TokStart, 0));
|
|
case 0:
|
|
case ' ':
|
|
case '\t':
|
|
// Ignore whitespace.
|
|
return LexToken();
|
|
case '\n': // FALL THROUGH.
|
|
case '\r': // FALL THROUGH.
|
|
case ';': return AsmToken(AsmToken::EndOfStatement, StringRef(TokStart, 1));
|
|
case ':': return AsmToken(AsmToken::Colon, StringRef(TokStart, 1));
|
|
case '+': return AsmToken(AsmToken::Plus, StringRef(TokStart, 1));
|
|
case '-': return AsmToken(AsmToken::Minus, StringRef(TokStart, 1));
|
|
case '~': return AsmToken(AsmToken::Tilde, StringRef(TokStart, 1));
|
|
case '(': return AsmToken(AsmToken::LParen, StringRef(TokStart, 1));
|
|
case ')': return AsmToken(AsmToken::RParen, StringRef(TokStart, 1));
|
|
case '[': return AsmToken(AsmToken::LBrac, StringRef(TokStart, 1));
|
|
case ']': return AsmToken(AsmToken::RBrac, StringRef(TokStart, 1));
|
|
case '{': return AsmToken(AsmToken::LCurly, StringRef(TokStart, 1));
|
|
case '}': return AsmToken(AsmToken::RCurly, StringRef(TokStart, 1));
|
|
case '*': return AsmToken(AsmToken::Star, StringRef(TokStart, 1));
|
|
case ',': return AsmToken(AsmToken::Comma, StringRef(TokStart, 1));
|
|
case '$': return AsmToken(AsmToken::Dollar, StringRef(TokStart, 1));
|
|
case '=':
|
|
if (*CurPtr == '=')
|
|
return ++CurPtr, AsmToken(AsmToken::EqualEqual, StringRef(TokStart, 2));
|
|
return AsmToken(AsmToken::Equal, StringRef(TokStart, 1));
|
|
case '|':
|
|
if (*CurPtr == '|')
|
|
return ++CurPtr, AsmToken(AsmToken::PipePipe, StringRef(TokStart, 2));
|
|
return AsmToken(AsmToken::Pipe, StringRef(TokStart, 1));
|
|
case '^': return AsmToken(AsmToken::Caret, StringRef(TokStart, 1));
|
|
case '&':
|
|
if (*CurPtr == '&')
|
|
return ++CurPtr, AsmToken(AsmToken::AmpAmp, StringRef(TokStart, 2));
|
|
return AsmToken(AsmToken::Amp, StringRef(TokStart, 1));
|
|
case '!':
|
|
if (*CurPtr == '=')
|
|
return ++CurPtr, AsmToken(AsmToken::ExclaimEqual, StringRef(TokStart, 2));
|
|
return AsmToken(AsmToken::Exclaim, StringRef(TokStart, 1));
|
|
case '%': return AsmToken(AsmToken::Percent, StringRef(TokStart, 1));
|
|
case '/': return LexSlash();
|
|
case '#': return AsmToken(AsmToken::Hash, StringRef(TokStart, 1));
|
|
case '"': return LexQuote();
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
return LexDigit();
|
|
case '<':
|
|
switch (*CurPtr) {
|
|
case '<': return ++CurPtr, AsmToken(AsmToken::LessLess,
|
|
StringRef(TokStart, 2));
|
|
case '=': return ++CurPtr, AsmToken(AsmToken::LessEqual,
|
|
StringRef(TokStart, 2));
|
|
case '>': return ++CurPtr, AsmToken(AsmToken::LessGreater,
|
|
StringRef(TokStart, 2));
|
|
default: return AsmToken(AsmToken::Less, StringRef(TokStart, 1));
|
|
}
|
|
case '>':
|
|
switch (*CurPtr) {
|
|
case '>': return ++CurPtr, AsmToken(AsmToken::GreaterGreater,
|
|
StringRef(TokStart, 2));
|
|
case '=': return ++CurPtr, AsmToken(AsmToken::GreaterEqual,
|
|
StringRef(TokStart, 2));
|
|
default: return AsmToken(AsmToken::Greater, StringRef(TokStart, 1));
|
|
}
|
|
|
|
// TODO: Quoted identifiers (objc methods etc)
|
|
// local labels: [0-9][:]
|
|
// Forward/backward labels: [0-9][fb]
|
|
// Integers, fp constants, character constants.
|
|
}
|
|
}
|