forked from OSchip/llvm-project
314 lines
8.7 KiB
C++
314 lines
8.7 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/ADT/StringSet.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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static StringSet<> &getSS(void *TheSS) {
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return *(StringSet<>*)TheSS;
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}
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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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TheStringSet = new StringSet<>();
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}
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AsmLexer::~AsmLexer() {
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delete &getSS(TheStringSet);
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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 asmtok::Error.
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asmtok::TokKind 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 asmtok::Error;
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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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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_$.@]*
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asmtok::TokKind AsmLexer::LexIdentifier() {
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while (isalnum(*CurPtr) || *CurPtr == '_' || *CurPtr == '$' ||
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*CurPtr == '.' || *CurPtr == '@')
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++CurPtr;
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// Unique string.
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CurStrVal =
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getSS(TheStringSet).GetOrCreateValue(TokStart, CurPtr, 0).getKeyData();
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return asmtok::Identifier;
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}
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/// LexPercent: Register: %[a-zA-Z0-9]+
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asmtok::TokKind AsmLexer::LexPercent() {
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if (!isalnum(*CurPtr))
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return asmtok::Percent; // Single %.
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while (isalnum(*CurPtr))
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++CurPtr;
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// Unique string.
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CurStrVal =
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getSS(TheStringSet).GetOrCreateValue(TokStart, CurPtr, 0).getKeyData();
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return asmtok::Register;
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}
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/// LexSlash: Slash: /
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/// C-Style Comment: /* ... */
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asmtok::TokKind 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 asmtok::Slash;
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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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asmtok::TokKind AsmLexer::LexLineComment() {
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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 asmtok::Eof;
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return asmtok::EndOfStatement;
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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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asmtok::TokKind 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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CurIntVal = strtoll(TokStart, 0, 10);
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return asmtok::IntVal;
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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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CurIntVal = strtoll(NumStart, 0, 2);
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return asmtok::IntVal;
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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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CurIntVal = strtoll(NumStart, 0, 16);
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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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CurIntVal = (int64_t)strtoull(NumStart, 0, 16);
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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 asmtok::IntVal;
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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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CurIntVal = strtoll(TokStart, 0, 8);
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return asmtok::IntVal;
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}
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/// LexQuote: String: "..."
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asmtok::TokKind 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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// Unique string, include quotes for now.
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CurStrVal =
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getSS(TheStringSet).GetOrCreateValue(TokStart, CurPtr, 0).getKeyData();
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return asmtok::String;
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}
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asmtok::TokKind 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_$.@]*
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if (isalpha(CurChar) || CurChar == '_' || CurChar == '.')
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return LexIdentifier();
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// Unknown character, emit an error.
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return ReturnError(TokStart, "invalid character in input");
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case EOF: return asmtok::Eof;
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case 0:
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case ' ':
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case '\t':
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// Ignore whitespace.
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return LexToken();
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case '\n': // FALL THROUGH.
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case '\r': // FALL THROUGH.
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case ';': return asmtok::EndOfStatement;
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case ':': return asmtok::Colon;
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case '+': return asmtok::Plus;
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case '-': return asmtok::Minus;
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case '~': return asmtok::Tilde;
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case '(': return asmtok::LParen;
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case ')': return asmtok::RParen;
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case '*': return asmtok::Star;
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case ',': return asmtok::Comma;
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case '$': return asmtok::Dollar;
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case '=':
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if (*CurPtr == '=')
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return ++CurPtr, asmtok::EqualEqual;
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return asmtok::Equal;
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case '|':
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if (*CurPtr == '|')
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return ++CurPtr, asmtok::PipePipe;
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return asmtok::Pipe;
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case '^': return asmtok::Caret;
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case '&':
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if (*CurPtr == '&')
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return ++CurPtr, asmtok::AmpAmp;
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return asmtok::Amp;
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case '!':
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if (*CurPtr == '=')
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return ++CurPtr, asmtok::ExclaimEqual;
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return asmtok::Exclaim;
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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, asmtok::LessLess;
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case '=': return ++CurPtr, asmtok::LessEqual;
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case '>': return ++CurPtr, asmtok::LessGreater;
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default: return asmtok::Less;
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}
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case '>':
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switch (*CurPtr) {
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case '>': return ++CurPtr, asmtok::GreaterGreater;
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case '=': return ++CurPtr, asmtok::GreaterEqual;
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default: return asmtok::Greater;
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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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