mpw/bin/lexer.rl

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/*
* Copyright (c) 2013, Kelvin W Sherlock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
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#include <string>
#include <algorithm>
#include <numeric>
#include <memory>
#include <deque>
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#include <cstdint>
#include <stdlib.h>
#include "debugger.h"
#include "parser.h"
void *ParseAlloc(void *(*mallocProc)(size_t));
void ParseFree(void *p, void (*freeProc)(void*));
void Parse(void *yyp, int yymajor, Debug::Token yyminor, Debug::Command *command);
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void ParseTrace(FILE *TraceFILE, char *zTracePrompt);
// for the common case....
void Parse(void *yyp, int yymajor, uint32_t yyminor, Debug::Command *command)
{
Parse(yyp, yymajor, Debug::Token::Make(yyminor), command);
}
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namespace {
int tox(char c)
{
c |= 0x20; // lowercase it.
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
return 0;
}
uint32_t scan10(const char *begin, const char *end)
{
return std::accumulate(begin, end, 0,
[](uint32_t value, char c){
return value * 10 + c - '0';
});
}
uint32_t scan16(const char *begin, const char *end)
{
return std::accumulate(begin, end, 0,
[](uint32_t value, char c){
return (value << 4) + tox(c);
});
}
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uint32_t scan2(const char *begin, const char *end)
{
return std::accumulate(begin, end, 0,
[](uint32_t value, char c){
return (value << 1) + (c & 0x01);
});
}
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uint32_t scancc(const char *begin, const char *end)
{
return std::accumulate(begin, end, 0,
[](uint32_t value, char c)
{
return (value << 8) + (unsigned)c;
}
);
}
}
%%{
machine lexer;
# this exits with cs == lexer_en_error.
error := any* ${ fbreak; };
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# identifiers.
ident := |*
[ \t\r\n]+;
[_A-Za-z][_A-Za-z0-9]* {
std::unique_ptr<std::string> sp(new std::string(ts, te));
Parse(parser, tkIDENTIFIER, Token::Make(sp.get(), 0), command);
Strings.push_back(std::move(sp));
};
*|;
# semi-colon commands.
semi := |*
[ \t\r\n]+;
'h'i | 'hd'i | 'hexdump'i {
Parse(parser, tkSEMIH, 0, command);
};
'i'i | 'info'i {
Parse(parser, tkSEMII, 0, command);
};
'l'i | 'list'i {
Parse(parser, tkSEMIL, 0, command);
};
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'date'i {
Parse(parser, tkSEMIDATE, 0, command);
};
'error'i {
Parse(parser, tkSEMIERROR, 0, command);
};
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't'i {
Parse(parser, tkSEMIT, 0, command);
fgoto ident;
};
*|;
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main := |*
[ \t\r\n]+;
'>=' { Parse(parser, tkGTEQ, 0, command); };
'>>' { Parse(parser, tkGTGT, 0, command); };
'<=' { Parse(parser, tkLTEQ, 0, command); };
'<<' { Parse(parser, tkLTLT, 0, command); };
'!=' { Parse(parser, tkBANGEQ, 0, command); };
'==' { Parse(parser, tkEQEQ, 0, command); };
'||' { Parse(parser, tkPIPEPIPE, 0, command); };
'&&' { Parse(parser, tkAMPAMP, 0, command); };
'(' { Parse(parser, tkLPAREN, 0, command); };
')' { Parse(parser, tkRPAREN, 0, command); };
'=' { Parse(parser, tkEQ, 0, command); };
'+' { Parse(parser, tkPLUS, 0, command); };
'-' { Parse(parser, tkMINUS, 0, command); };
'*' { Parse(parser, tkSTAR, 0, command); };
'/' { Parse(parser, tkSLASH, 0, command); };
'%' { Parse(parser, tkPERCENT, 0, command); };
'~' { Parse(parser, tkTILDE, 0, command); };
'!' { Parse(parser, tkBANG, 0, command); };
'^' { Parse(parser, tkCARET, 0, command); };
'&' { Parse(parser, tkAMP, 0, command); };
'|' { Parse(parser, tkPIPE, 0, command); };
'<' { Parse(parser, tkLT, 0, command); };
'>' { Parse(parser, tkGT, 0, command); };
':' { Parse(parser, tkCOLON, 0, command); };
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'@' { Parse(parser, tkAT, 0, command); };
';' {
Parse(parser, tkSEMI, 0, command);
fgoto semi;
};
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'$' xdigit + {
uint32_t value = scan16(ts + 1, te);
Parse(parser, tkINTEGER, value, command);
};
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'0x'i xdigit+ {
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// hexadecimal
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uint32_t value = scan16(ts + 2, te);
Parse(parser, tkINTEGER, value, command);
};
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'0b'i [01]+ {
// binary
uint32_t value = scan2(ts + 2, te);
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Parse(parser, tkINTEGER, value, command);
};
digit+ {
uint32_t value = scan10(ts, te);
Parse(parser, tkINTEGER, value, command);
};
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# todo -- (\['\]|[^'\]){1,4} ?
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['] [^']{1,4} ['] {
// 4 cc code
uint32_t value = scancc(ts + 1, te - 1);
Parse(parser, tkINTEGER, value, command);
};
'd'i [0-7] {
// data register
uint32_t data = ts[1] - '0';
Parse(parser, tkDREGISTER, data, command);
};
'a'i [0-7] {
// address register
uint32_t data = ts[1] - '0';
Parse(parser, tkAREGISTER, data, command);
};
'pc'i {
// program counter...
Parse(parser, tkXREGISTER, 0, command);
};
'csr'i {
// condition status register.
Parse(parser, tkXREGISTER, 1, command);
};
'sp'i {
// stack pointer aka a7
Parse(parser, tkAREGISTER, 7, command);
};
'fp'i {
// frame pointer aka a6
Parse(parser, tkAREGISTER, 6, command);
};
# commands...
'bt'i | 'backtrace'i {
Parse(parser, tkBACKTRACE, 0, command);
};
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'c'i | 'continue'i {
Parse(parser, tkCONTINUE, 0, command);
};
'hd'i | 'dump'i {
Parse(parser, tkDUMP, 0, command);
};
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'sc'i | 'stackcrawl'i {
Parse(parser, tkSTACKCRAWL, 0, command);
};
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'h'i | 'help'i {
Parse(parser, tkHELP, 0, command);
};
'l'i | 'list'i {
Parse(parser, tkLIST, 0, command);
};
'n'i | 'next'i {
Parse(parser, tkNEXT, 0, command);
};
's'i | 'step'i {
Parse(parser, tkNEXT, 0, command);
};
'b'i | 'brk'i | 'break'i {
Parse(parser, tkBREAK, 0, command);
};
'tbrk'i | 'tbreak'i | 'toolbreak'i {
Parse(parser, tkTBREAK, 0, command);
};
'mbrk'i | 'mbreak'i | 'rwbrk'i | 'rwbreak'i {
Parse(parser, tkRWBREAK, 0, command);
};
'rbrk'i | 'rbreak'i {
Parse(parser, tkRBREAK, 0, command);
};
'wbrk'i | 'wbreak'i {
Parse(parser, tkWBREAK, 0, command);
};
'g'i | 'go'i {
Parse(parser, tkCONTINUE, 0, command);
};
'p'i | 'print'i {
Parse(parser, tkPRINT, 0, command);
};
'r'i | 'run'i {
Parse(parser, tkCONTINUE, 0, command);
};
# generic identifier
# since % is a valid character, should drop %/modulo operator.
[%_A-Za-z][%_.A-Za-z0-9]* {
std::unique_ptr<std::string> sp(new std::string(ts, te));
Parse(parser, tkIDENTIFIER, Token::Make(sp.get(), 0), command);
Strings.push_back(std::move(sp));
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};
# end of the line...
#0 {
# Parse(parser, tkEOL, 0, command);
#};
#any {
# fprintf(stderr, "illegal character: `%c`\n", *ts);
# fbreak;
#};
*|;
}%%
namespace Debug {
bool ParseLine(const char *iter, Command *command)
{
%% write data;
void *parser;
// string table to avoid memory leaks in parser.
std::deque<std::unique_ptr<std::string>> Strings;
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parser = ParseAlloc(malloc);
//ParseTrace(stdout, "--> ");
command->action = cmdNull;
int length = strlen(iter);
const char *p = iter;
const char *pe = iter + length;
const char *eof = pe;
const char *ts;
const char *te;
int cs, act;
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%% write init;
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%% write exec;
if (cs == lexer_error || cs < lexer_first_final)
{
if (p == eof)
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{
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fprintf(stderr, "Unexpected end of line\n");
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}
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else
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{
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for (size_t i = 0, l = 2 + (p - iter); i < l; ++i)
fputc(' ', stderr);
fprintf(stderr, "^\nunexpected character: `%c'\n", *p);
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}
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ParseFree(parser, free);
return false;
}
/*
if (cs == lexer_en_error)
{
ParseFree(parser, free);
return false;
}
if (cs < lexer_first_final)
{
fprintf(stderr, "Incomplete command\n");
ParseFree(parser, free);
return false;
}
*/
if (p == pe)
{
// always true?
Parse(parser, tkEOL, 0, command);
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}
Parse(parser, 0, 0, command);
ParseFree(parser, free);
if (!command->valid)
fprintf(stderr,"I don't understand.\n");
return command->valid;
}
} // namespace