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333 lines
11 KiB
C++
333 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 "AsmLexer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Config/config.h" // for strtoull.
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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(SourceMgr &SM) : SrcMgr(SM) {
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CurBuffer = 0;
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CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
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CurPtr = CurBuf->getBufferStart();
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TokStart = 0;
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}
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AsmLexer::~AsmLexer() {
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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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void AsmLexer::PrintMessage(SMLoc Loc, const std::string &Msg,
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const char *Type) const {
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SrcMgr.PrintMessage(Loc, Msg, Type);
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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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SrcMgr.PrintMessage(SMLoc::getFromPointer(Loc), Msg, "error");
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return AsmToken(AsmToken::Error, StringRef(Loc, 0));
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}
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/// EnterIncludeFile - Enter the specified file. This prints an error and
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/// returns true on failure.
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bool AsmLexer::EnterIncludeFile(const std::string &Filename) {
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int NewBuf = SrcMgr.AddIncludeFile(Filename, SMLoc::getFromPointer(CurPtr));
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if (NewBuf == -1)
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return true;
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// Save the line number and lex buffer of the includer.
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CurBuffer = NewBuf;
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CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
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CurPtr = CurBuf->getBufferStart();
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return false;
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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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// If this is the end of an included file, pop the parent file off the
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// include stack.
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SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
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if (ParentIncludeLoc != SMLoc()) {
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CurBuffer = SrcMgr.FindBufferContainingLoc(ParentIncludeLoc);
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CurBuf = SrcMgr.getMemoryBuffer(CurBuffer);
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CurPtr = ParentIncludeLoc.getPointer();
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// Reset the token start pointer to the start of the new file.
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TokStart = CurPtr;
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return getNextChar();
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}
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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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}
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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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return AsmToken(AsmToken::Identifier, StringRef(TokStart, CurPtr - TokStart));
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}
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/// LexPercent: Register: %[a-zA-Z0-9]+
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AsmToken AsmLexer::LexPercent() {
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if (!isalnum(*CurPtr))
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return AsmToken(AsmToken::Percent, StringRef(CurPtr, 1)); // Single %.
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while (isalnum(*CurPtr))
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++CurPtr;
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return AsmToken(AsmToken::Register, 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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if (*CurPtr == ':')
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return ReturnError(TokStart, "FIXME: local label not implemented");
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if (*CurPtr == 'f' || *CurPtr == 'b')
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return ReturnError(TokStart, "FIXME: directional label not implemented");
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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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return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
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strtoll(TokStart, 0, 10));
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}
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if (*CurPtr == 'b') {
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++CurPtr;
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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(CurPtr-2, "Invalid binary number");
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return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
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strtoll(NumStart, 0, 2));
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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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errno = 0;
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if (errno == EINVAL)
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return ReturnError(CurPtr-2, "Invalid hexadecimal number");
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if (errno == ERANGE) {
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errno = 0;
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if (errno == EINVAL)
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return ReturnError(CurPtr-2, "Invalid hexadecimal number");
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if (errno == ERANGE)
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return ReturnError(CurPtr-2, "Hexadecimal number out of range");
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}
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return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
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(int64_t) strtoull(NumStart, 0, 16));
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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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return AsmToken(AsmToken::Integer, StringRef(TokStart, CurPtr - TokStart),
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strtoll(TokStart, 0, 8));
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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 (*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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return StringRef(TokStart, CurPtr-TokStart);
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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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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::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 '=':
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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 LexPercent();
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case '/': return LexSlash();
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case '#': return LexLineComment();
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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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