forked from OSchip/llvm-project
488 lines
14 KiB
C++
488 lines
14 KiB
C++
//===- TGLexer.cpp - Lexer for TableGen -----------------------------------===//
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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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// Implement the Lexer for TableGen.
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//
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//===----------------------------------------------------------------------===//
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#include "TGLexer.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Config/config.h" // for strtoull()/strtoll() define
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/TableGen/Error.h"
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#include <cctype>
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#include <cerrno>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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using namespace llvm;
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TGLexer::TGLexer(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 = nullptr;
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}
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SMLoc TGLexer::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 tgtok::Error.
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tgtok::TokKind TGLexer::ReturnError(const char *Loc, const Twine &Msg) {
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PrintError(Loc, Msg);
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return tgtok::Error;
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}
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int TGLexer::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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case '\n':
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case '\r':
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// Handle the newline character by ignoring it and incrementing the line
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// count. However, be careful about 'dos style' files with \n\r in them.
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// Only treat a \n\r or \r\n as a single line.
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if ((*CurPtr == '\n' || (*CurPtr == '\r')) &&
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*CurPtr != CurChar)
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++CurPtr; // Eat the two char newline sequence.
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return '\n';
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}
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}
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int TGLexer::peekNextChar(int Index) {
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return *(CurPtr + Index);
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}
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tgtok::TokKind TGLexer::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 letters: [a-zA-Z_]
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if (isalpha(CurChar) || CurChar == '_')
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return LexIdentifier();
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// Unknown character, emit an error.
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return ReturnError(TokStart, "Unexpected character");
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case EOF: return tgtok::Eof;
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case ':': return tgtok::colon;
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case ';': return tgtok::semi;
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case '.': return tgtok::period;
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case ',': return tgtok::comma;
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case '<': return tgtok::less;
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case '>': return tgtok::greater;
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case ']': return tgtok::r_square;
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case '{': return tgtok::l_brace;
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case '}': return tgtok::r_brace;
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case '(': return tgtok::l_paren;
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case ')': return tgtok::r_paren;
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case '=': return tgtok::equal;
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case '?': return tgtok::question;
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case '#': return tgtok::paste;
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case 0:
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case ' ':
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case '\t':
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case '\n':
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case '\r':
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// Ignore whitespace.
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return LexToken();
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case '/':
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// If this is the start of a // comment, skip until the end of the line or
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// the end of the buffer.
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if (*CurPtr == '/')
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SkipBCPLComment();
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else if (*CurPtr == '*') {
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if (SkipCComment())
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return tgtok::Error;
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} else // Otherwise, this is an error.
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return ReturnError(TokStart, "Unexpected character");
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return LexToken();
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case '-': case '+':
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case '0': case '1': case '2': case '3': case '4': case '5': case '6':
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case '7': case '8': case '9': {
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int NextChar = 0;
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if (isdigit(CurChar)) {
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// Allow identifiers to start with a number if it is followed by
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// an identifier. This can happen with paste operations like
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// foo#8i.
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int i = 0;
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do {
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NextChar = peekNextChar(i++);
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} while (isdigit(NextChar));
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if (NextChar == 'x' || NextChar == 'b') {
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// If this is [0-9]b[01] or [0-9]x[0-9A-fa-f] this is most
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// likely a number.
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int NextNextChar = peekNextChar(i);
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switch (NextNextChar) {
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default:
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break;
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case '0': case '1':
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if (NextChar == 'b')
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return LexNumber();
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// Fallthrough
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case '2': case '3': case '4': case '5':
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case '6': case '7': case '8': case '9':
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case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
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case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
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if (NextChar == 'x')
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return LexNumber();
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break;
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}
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}
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}
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if (isalpha(NextChar) || NextChar == '_')
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return LexIdentifier();
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return LexNumber();
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}
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case '"': return LexString();
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case '$': return LexVarName();
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case '[': return LexBracket();
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case '!': return LexExclaim();
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}
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}
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/// LexString - Lex "[^"]*"
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tgtok::TokKind TGLexer::LexString() {
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const char *StrStart = CurPtr;
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CurStrVal = "";
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while (*CurPtr != '"') {
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// If we hit the end of the buffer, report an error.
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if (*CurPtr == 0 && CurPtr == CurBuf->getBufferEnd())
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return ReturnError(StrStart, "End of file in string literal");
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if (*CurPtr == '\n' || *CurPtr == '\r')
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return ReturnError(StrStart, "End of line in string literal");
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if (*CurPtr != '\\') {
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CurStrVal += *CurPtr++;
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continue;
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}
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++CurPtr;
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switch (*CurPtr) {
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case '\\': case '\'': case '"':
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// These turn into their literal character.
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CurStrVal += *CurPtr++;
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break;
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case 't':
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CurStrVal += '\t';
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++CurPtr;
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break;
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case 'n':
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CurStrVal += '\n';
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++CurPtr;
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break;
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case '\n':
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case '\r':
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return ReturnError(CurPtr, "escaped newlines not supported in tblgen");
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// If we hit the end of the buffer, report an error.
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case '\0':
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if (CurPtr == CurBuf->getBufferEnd())
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return ReturnError(StrStart, "End of file in string literal");
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// FALL THROUGH
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default:
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return ReturnError(CurPtr, "invalid escape in string literal");
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}
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}
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++CurPtr;
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return tgtok::StrVal;
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}
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tgtok::TokKind TGLexer::LexVarName() {
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if (!isalpha(CurPtr[0]) && CurPtr[0] != '_')
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return ReturnError(TokStart, "Invalid variable name");
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// Otherwise, we're ok, consume the rest of the characters.
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const char *VarNameStart = CurPtr++;
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while (isalpha(*CurPtr) || isdigit(*CurPtr) || *CurPtr == '_')
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++CurPtr;
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CurStrVal.assign(VarNameStart, CurPtr);
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return tgtok::VarName;
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}
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tgtok::TokKind TGLexer::LexIdentifier() {
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// The first letter is [a-zA-Z_#].
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const char *IdentStart = TokStart;
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// Match the rest of the identifier regex: [0-9a-zA-Z_#]*
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while (isalpha(*CurPtr) || isdigit(*CurPtr) || *CurPtr == '_')
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++CurPtr;
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// Check to see if this identifier is a keyword.
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StringRef Str(IdentStart, CurPtr-IdentStart);
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if (Str == "include") {
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if (LexInclude()) return tgtok::Error;
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return Lex();
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}
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tgtok::TokKind Kind = StringSwitch<tgtok::TokKind>(Str)
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.Case("int", tgtok::Int)
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.Case("bit", tgtok::Bit)
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.Case("bits", tgtok::Bits)
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.Case("string", tgtok::String)
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.Case("list", tgtok::List)
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.Case("code", tgtok::Code)
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.Case("dag", tgtok::Dag)
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.Case("class", tgtok::Class)
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.Case("def", tgtok::Def)
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.Case("foreach", tgtok::Foreach)
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.Case("defm", tgtok::Defm)
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.Case("multiclass", tgtok::MultiClass)
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.Case("field", tgtok::Field)
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.Case("let", tgtok::Let)
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.Case("in", tgtok::In)
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.Default(tgtok::Id);
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if (Kind == tgtok::Id)
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CurStrVal.assign(Str.begin(), Str.end());
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return Kind;
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}
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/// LexInclude - We just read the "include" token. Get the string token that
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/// comes next and enter the include.
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bool TGLexer::LexInclude() {
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// The token after the include must be a string.
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tgtok::TokKind Tok = LexToken();
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if (Tok == tgtok::Error) return true;
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if (Tok != tgtok::StrVal) {
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PrintError(getLoc(), "Expected filename after include");
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return true;
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}
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// Get the string.
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std::string Filename = CurStrVal;
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std::string IncludedFile;
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CurBuffer = SrcMgr.AddIncludeFile(Filename, SMLoc::getFromPointer(CurPtr),
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IncludedFile);
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if (CurBuffer == -1) {
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PrintError(getLoc(), "Could not find include file '" + Filename + "'");
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return true;
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}
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DependenciesMapTy::const_iterator Found = Dependencies.find(IncludedFile);
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if (Found != Dependencies.end()) {
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PrintError(getLoc(),
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"File '" + IncludedFile + "' has already been included.");
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SrcMgr.PrintMessage(Found->second, SourceMgr::DK_Note,
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"previously included here");
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return true;
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}
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Dependencies.insert(std::make_pair(IncludedFile, getLoc()));
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// Save the line number and lex buffer of the includer.
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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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void TGLexer::SkipBCPLComment() {
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++CurPtr; // skip the second slash.
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while (1) {
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switch (*CurPtr) {
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case '\n':
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case '\r':
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return; // Newline is end of comment.
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case 0:
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// If this is the end of the buffer, end the comment.
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if (CurPtr == CurBuf->getBufferEnd())
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return;
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break;
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}
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// Otherwise, skip the character.
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++CurPtr;
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}
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}
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/// SkipCComment - This skips C-style /**/ comments. The only difference from C
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/// is that we allow nesting.
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bool TGLexer::SkipCComment() {
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++CurPtr; // skip the star.
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unsigned CommentDepth = 1;
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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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PrintError(TokStart, "Unterminated comment!");
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return true;
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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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if (--CommentDepth == 0)
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return false;
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break;
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case '/':
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// Start of a nested comment?
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if (CurPtr[0] != '*') break;
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++CurPtr;
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++CommentDepth;
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break;
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}
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}
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}
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/// LexNumber - Lex:
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/// [-+]?[0-9]+
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/// 0x[0-9a-fA-F]+
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/// 0b[01]+
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tgtok::TokKind TGLexer::LexNumber() {
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if (CurPtr[-1] == '0') {
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if (CurPtr[0] == '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(TokStart, "Invalid hexadecimal number");
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errno = 0;
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CurIntVal = strtoll(NumStart, nullptr, 16);
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if (errno == EINVAL)
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return ReturnError(TokStart, "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, nullptr, 16);
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if (errno == EINVAL)
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return ReturnError(TokStart, "Invalid hexadecimal number");
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if (errno == ERANGE)
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return ReturnError(TokStart, "Hexadecimal number out of range");
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}
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return tgtok::IntVal;
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} else if (CurPtr[0] == '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, nullptr, 2);
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return tgtok::IntVal;
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}
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}
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// Check for a sign without a digit.
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if (!isdigit(CurPtr[0])) {
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if (CurPtr[-1] == '-')
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return tgtok::minus;
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else if (CurPtr[-1] == '+')
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return tgtok::plus;
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}
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while (isdigit(CurPtr[0]))
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++CurPtr;
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CurIntVal = strtoll(TokStart, nullptr, 10);
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return tgtok::IntVal;
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}
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/// LexBracket - We just read '['. If this is a code block, return it,
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/// otherwise return the bracket. Match: '[' and '[{ ( [^}]+ | }[^]] )* }]'
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tgtok::TokKind TGLexer::LexBracket() {
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if (CurPtr[0] != '{')
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return tgtok::l_square;
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++CurPtr;
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const char *CodeStart = CurPtr;
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while (1) {
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int Char = getNextChar();
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if (Char == EOF) break;
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if (Char != '}') continue;
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Char = getNextChar();
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if (Char == EOF) break;
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if (Char == ']') {
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CurStrVal.assign(CodeStart, CurPtr-2);
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return tgtok::CodeFragment;
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}
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}
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return ReturnError(CodeStart-2, "Unterminated Code Block");
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}
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/// LexExclaim - Lex '!' and '![a-zA-Z]+'.
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tgtok::TokKind TGLexer::LexExclaim() {
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if (!isalpha(*CurPtr))
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return ReturnError(CurPtr - 1, "Invalid \"!operator\"");
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const char *Start = CurPtr++;
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while (isalpha(*CurPtr))
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++CurPtr;
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// Check to see which operator this is.
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tgtok::TokKind Kind =
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StringSwitch<tgtok::TokKind>(StringRef(Start, CurPtr - Start))
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.Case("eq", tgtok::XEq)
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.Case("if", tgtok::XIf)
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.Case("head", tgtok::XHead)
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.Case("tail", tgtok::XTail)
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.Case("con", tgtok::XConcat)
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.Case("add", tgtok::XADD)
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.Case("shl", tgtok::XSHL)
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.Case("sra", tgtok::XSRA)
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.Case("srl", tgtok::XSRL)
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.Case("cast", tgtok::XCast)
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.Case("empty", tgtok::XEmpty)
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.Case("subst", tgtok::XSubst)
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.Case("foreach", tgtok::XForEach)
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.Case("listconcat", tgtok::XListConcat)
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.Case("strconcat", tgtok::XStrConcat)
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.Default(tgtok::Error);
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return Kind != tgtok::Error ? Kind : ReturnError(Start-1, "Unknown operator");
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}
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