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pico-sdk/tools/pioasm/lexer.ll

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Initial Release
2021-01-20 16:44:27 +00:00
/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
%{ /* -*- C++ -*- */
# include <cerrno>
# include <climits>
# include <cstdlib>
# include <cstring>
# include <string>
# include "pio_assembler.h"
# include "parser.hpp"
#ifdef _MSC_VER
#pragma warning(disable : 4996) // fopen
#endif
%}
%option noyywrap nounput noinput batch debug never-interactive case-insensitive noline
%{
yy::parser::symbol_type make_INT(const std::string &s, const yy::parser::location_type& loc);
yy::parser::symbol_type make_HEX(const std::string &s, const yy::parser::location_type& loc);
yy::parser::symbol_type make_BINARY(const std::string &s, const yy::parser::location_type& loc);
%}
blank [ \t]
whitesp {blank}+
comment (";"|"//")[^\n]*
digit [0-9]
id [a-zA-Z_][a-zA-Z0-9_]*
binary "0b"[01]+
int {digit}+
hex "0x"[0-9a-fA-F]+
directive \.{id}
output_fmt [^%\n]+
%{
// Code run each time a pattern is matched.
# define YY_USER_ACTION loc.columns (yyleng);
%}
%x code_block
%x c_comment
%x lang_opt
%%
std::string code_block_contents;
yy::location code_block_start;
%{
// A handy shortcut to the location held by the pio_assembler.
yy::location& loc = pioasm.location;
// Code run each time yylex is called.
loc.step();
%}
{blank}+ loc.step();
\n+ { auto loc_newline = loc; loc_newline.end = loc_newline.begin; loc.lines(yyleng); loc.step(); return yy::parser::make_NEWLINE(loc_newline); }
"%"{blank}*{output_fmt}{blank}*"{" {
BEGIN(code_block);
code_block_contents = "";
code_block_start = loc;
std::string tmp(yytext);
tmp = tmp.substr(1, tmp.length() - 2);
tmp = tmp.erase(0, tmp.find_first_not_of(" \t"));
tmp = tmp.erase(tmp.find_last_not_of(" \t") + 1);
return yy::parser::make_CODE_BLOCK_START( tmp, loc);
}
<code_block>{
{blank}+ loc.step();
\n+ { auto loc_newline = loc; loc_newline.end = loc_newline.begin; loc.lines(yyleng); loc.step(); }
"%}" { BEGIN(INITIAL); auto loc2 = loc; loc2.begin = code_block_start.begin; return yy::parser::make_CODE_BLOCK_CONTENTS(code_block_contents, loc2); }
.* { code_block_contents += std::string(yytext) + "\n"; }
}
<c_comment>{
{blank}+ loc.step();
"*/" { BEGIN(INITIAL); }
"*" { }
[^\n\*]* { }
\n+ { auto loc_newline = loc; loc_newline.end = loc_newline.begin; loc.lines(yyleng); loc.step(); }
}
<lang_opt>{
\"[^\n]*\" return yy::parser::make_STRING(yytext, loc);
{blank}+ loc.step();
"=" return yy::parser::make_EQUAL(loc);
{int} return make_INT(yytext, loc);
{hex} return make_HEX(yytext, loc);
{binary} return make_BINARY(yytext, loc);
[^ \t\n\"=]+ return yy::parser::make_NON_WS(yytext, loc);
\n+ { BEGIN(INITIAL); auto loc_newline = loc; loc_newline.end = loc_newline.begin; loc.lines(yyleng); loc.step(); return yy::parser::make_NEWLINE(loc_newline); }
. { throw yy::parser::syntax_error(loc, "invalid character: " + std::string(yytext)); }
}
"/*" { BEGIN(c_comment); }
"," return yy::parser::make_COMMA(loc);
"::" return yy::parser::make_REVERSE(loc);
":" return yy::parser::make_COLON(loc);
"[" return yy::parser::make_LBRACKET(loc);
"]" return yy::parser::make_RBRACKET(loc);
"(" return yy::parser::make_LPAREN(loc);
")" return yy::parser::make_RPAREN(loc);
"+" return yy::parser::make_PLUS(loc);
"--" return yy::parser::make_POST_DECREMENT(loc);
"−−" return yy::parser::make_POST_DECREMENT(loc);
"-" return yy::parser::make_MINUS(loc);
"*" return yy::parser::make_MULTIPLY(loc);
"/" return yy::parser::make_DIVIDE(loc);
"|" return yy::parser::make_OR(loc);
"&" return yy::parser::make_AND(loc);
"^" return yy::parser::make_XOR(loc);
"!=" return yy::parser::make_NOT_EQUAL(loc);
"!" return yy::parser::make_NOT(loc);
"~" return yy::parser::make_NOT(loc);
".program" return yy::parser::make_PROGRAM(loc);
".wrap_target" return yy::parser::make_WRAP_TARGET(loc);
".wrap" return yy::parser::make_WRAP(loc);
".word" return yy::parser::make_WORD(loc);
".define" return yy::parser::make_DEFINE(loc);
".side_set" return yy::parser::make_SIDE_SET(loc);
".origin" return yy::parser::make_ORIGIN(loc);
".lang_opt" { BEGIN(lang_opt); return yy::parser::make_LANG_OPT(loc); }
{directive} return yy::parser::make_UNKNOWN_DIRECTIVE(yytext, loc);
"JMP" return yy::parser::make_JMP(loc);
"WAIT" return yy::parser::make_WAIT(loc);
"IN" return yy::parser::make_IN(loc);
"OUT" return yy::parser::make_OUT(loc);
"PUSH" return yy::parser::make_PUSH(loc);
"PULL" return yy::parser::make_PULL(loc);
"MOV" return yy::parser::make_MOV(loc);
"IRQ" return yy::parser::make_IRQ(loc);
"SET" return yy::parser::make_SET(loc);
"NOP" return yy::parser::make_NOP(loc);
"PUBLIC" return yy::parser::make_PUBLIC(loc);
"OPTIONAL" return yy::parser::make_OPTIONAL(loc);
"OPT" return yy::parser::make_OPTIONAL(loc);
"SIDE" return yy::parser::make_SIDE(loc);
"SIDESET" return yy::parser::make_SIDE(loc);
"SIDE_SET" return yy::parser::make_SIDE(loc);
"PIN" return yy::parser::make_PIN(loc);
"GPIO" return yy::parser::make_GPIO(loc);
"OSRE" return yy::parser::make_OSRE(loc);
"PINS" return yy::parser::make_PINS(loc);
"NULL" return yy::parser::make_NULL(loc);
"PINDIRS" return yy::parser::make_PINDIRS(loc);
"X" return yy::parser::make_X(loc);
"Y" return yy::parser::make_Y(loc);
"PC" return yy::parser::make_PC(loc);
"EXEC" return yy::parser::make_EXEC(loc);
"ISR" return yy::parser::make_ISR(loc);
"OSR" return yy::parser::make_OSR(loc);
"STATUS" return yy::parser::make_STATUS(loc);
"BLOCK" return yy::parser::make_BLOCK(loc);
"NOBLOCK" return yy::parser::make_NOBLOCK(loc);
"IFFULL" return yy::parser::make_IFFULL(loc);
"IFEMPTY" return yy::parser::make_IFEMPTY(loc);
"REL" return yy::parser::make_REL(loc);
"CLEAR" return yy::parser::make_CLEAR(loc);
"NOWAIT" return yy::parser::make_NOWAIT(loc);
"ONE" return yy::parser::make_INT(1, loc);
"ZERO" return yy::parser::make_INT(0, loc);
<<EOF>> return yy::parser::make_END(loc);
{int} return make_INT(yytext, loc);
{hex} return make_HEX(yytext, loc);
{binary} return make_BINARY(yytext, loc);
{id} return yy::parser::make_ID(yytext, loc);
{comment} { }
. { throw yy::parser::syntax_error(loc, "invalid character: " + std::string(yytext)); }
%%
yy::parser::symbol_type make_INT(const std::string &s, const yy::parser::location_type& loc)
{
errno = 0;
long n = strtol (s.c_str(), NULL, 10);
if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
throw yy::parser::syntax_error (loc, "integer is out of range: " + s);
return yy::parser::make_INT((int) n, loc);
}
yy::parser::symbol_type make_HEX(const std::string &s, const yy::parser::location_type& loc)
{
errno = 0;
long n = strtol (s.c_str() + 2, NULL, 16);
if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
throw yy::parser::syntax_error (loc, "hex is out of range: " + s);
return yy::parser::make_INT((int) n, loc);
}
yy::parser::symbol_type make_BINARY(const std::string &s, const yy::parser::location_type& loc)
{
errno = 0;
long n = strtol (s.c_str()+2, NULL, 2);
if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
throw yy::parser::syntax_error (loc, "binary is out of range: " + s);
return yy::parser::make_INT((int) n, loc);
}
void pio_assembler::scan_begin ()
{
yy_flex_debug = false;
if (source.empty () || source == "-")
yyin = stdin;
else if (!(yyin = fopen (source.c_str (), "r")))
{
std::cerr << "cannot open " << source << ": " << strerror(errno) << '\n';
exit (EXIT_FAILURE);
}
}
void pio_assembler::scan_end ()
{
fclose (yyin);
}
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