diff options
Diffstat (limited to 'scripts/dtc/dtc-lexer.l')
| -rw-r--r-- | scripts/dtc/dtc-lexer.l | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/scripts/dtc/dtc-lexer.l b/scripts/dtc/dtc-lexer.l new file mode 100644 index 0000000..44dbfd3 --- /dev/null +++ b/scripts/dtc/dtc-lexer.l @@ -0,0 +1,320 @@ +/* + * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. + * + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + */ + +%option noyywrap nounput yylineno + +%x INCLUDE +%x BYTESTRING +%x PROPNODENAME +%s V1 + +PROPNODECHAR [a-zA-Z0-9,._+*#?@-] +PATHCHAR ({PROPNODECHAR}|[/]) +LABEL [a-zA-Z_][a-zA-Z0-9_]* +STRING \"([^\\"]|\\.)*\" +WS [[:space:]] +COMMENT "/*"([^*]|\*+[^*/])*\*+"/" +LINECOMMENT "//".*\n + +%{ +#include "dtc.h" +#include "srcpos.h" +#include "dtc-parser.tab.h" + + +/*#define LEXDEBUG 1*/ + +#ifdef LEXDEBUG +#define DPRINT(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__) +#else +#define DPRINT(fmt, ...) do { } while (0) +#endif + +static int dts_version; /* = 0 */ + +#define BEGIN_DEFAULT() if (dts_version == 0) { \ + DPRINT("<INITIAL>\n"); \ + BEGIN(INITIAL); \ + } else { \ + DPRINT("<V1>\n"); \ + BEGIN(V1); \ + } + +static void push_input_file(const char *filename); +static int pop_input_file(void); +%} + +%% +<*>"/include/"{WS}*{STRING} { + char *name = strchr(yytext, '\"') + 1; + yytext[yyleng-1] = '\0'; + push_input_file(name); + } + +<*><<EOF>> { + if (!pop_input_file()) { + yyterminate(); + } + } + +<*>{STRING} { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("String: %s\n", yytext); + yylval.data = data_copy_escape_string(yytext+1, + yyleng-2); + yylloc.first_line = yylineno; + return DT_STRING; + } + +<*>"/dts-v1/" { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Keyword: /dts-v1/\n"); + dts_version = 1; + BEGIN_DEFAULT(); + return DT_V1; + } + +<*>"/memreserve/" { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Keyword: /memreserve/\n"); + BEGIN_DEFAULT(); + return DT_MEMRESERVE; + } + +<*>{LABEL}: { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Label: %s\n", yytext); + yylval.labelref = strdup(yytext); + yylval.labelref[yyleng-1] = '\0'; + return DT_LABEL; + } + +<INITIAL>[bodh]# { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + if (*yytext == 'b') + yylval.cbase = 2; + else if (*yytext == 'o') + yylval.cbase = 8; + else if (*yytext == 'd') + yylval.cbase = 10; + else + yylval.cbase = 16; + DPRINT("Base: %d\n", yylval.cbase); + return DT_BASE; + } + +<INITIAL>[0-9a-fA-F]+ { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + yylval.literal = strdup(yytext); + DPRINT("Literal: '%s'\n", yylval.literal); + return DT_LEGACYLITERAL; + } + +<V1>[0-9]+|0[xX][0-9a-fA-F]+ { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + yylval.literal = strdup(yytext); + DPRINT("Literal: '%s'\n", yylval.literal); + return DT_LITERAL; + } + +\&{LABEL} { /* label reference */ + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Ref: %s\n", yytext+1); + yylval.labelref = strdup(yytext+1); + return DT_REF; + } + +"&{/"{PATHCHAR}+\} { /* new-style path reference */ + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + yytext[yyleng-1] = '\0'; + DPRINT("Ref: %s\n", yytext+2); + yylval.labelref = strdup(yytext+2); + return DT_REF; + } + +<INITIAL>"&/"{PATHCHAR}+ { /* old-style path reference */ + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Ref: %s\n", yytext+1); + yylval.labelref = strdup(yytext+1); + return DT_REF; + } + +<BYTESTRING>[0-9a-fA-F]{2} { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + yylval.byte = strtol(yytext, NULL, 16); + DPRINT("Byte: %02x\n", (int)yylval.byte); + return DT_BYTE; + } + +<BYTESTRING>"]" { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("/BYTESTRING\n"); + BEGIN_DEFAULT(); + return ']'; + } + +<PROPNODENAME>{PROPNODECHAR}+ { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("PropNodeName: %s\n", yytext); + yylval.propnodename = strdup(yytext); + BEGIN_DEFAULT(); + return DT_PROPNODENAME; + } + +"/incbin/" { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Binary Include\n"); + return DT_INCBIN; + } + +<*>{WS}+ /* eat whitespace */ +<*>{COMMENT}+ /* eat C-style comments */ +<*>{LINECOMMENT}+ /* eat C++-style comments */ + +<*>. { + yylloc.file = srcpos_file; + yylloc.first_line = yylineno; + DPRINT("Char: %c (\\x%02x)\n", yytext[0], + (unsigned)yytext[0]); + if (yytext[0] == '[') { + DPRINT("<BYTESTRING>\n"); + BEGIN(BYTESTRING); + } + if ((yytext[0] == '{') + || (yytext[0] == ';')) { + DPRINT("<PROPNODENAME>\n"); + BEGIN(PROPNODENAME); + } + return yytext[0]; + } + +%% + + +/* + * Stack of nested include file contexts. + */ + +struct incl_file { + struct dtc_file *file; + YY_BUFFER_STATE yy_prev_buf; + int yy_prev_lineno; + struct incl_file *prev; +}; + +static struct incl_file *incl_file_stack; + + +/* + * Detect infinite include recursion. + */ +#define MAX_INCLUDE_DEPTH (100) + +static int incl_depth = 0; + + +static void push_input_file(const char *filename) +{ + struct incl_file *incl_file; + struct dtc_file *newfile; + struct search_path search, *searchptr = NULL; + + assert(filename); + + if (incl_depth++ >= MAX_INCLUDE_DEPTH) + die("Includes nested too deeply"); + + if (srcpos_file) { + search.dir = srcpos_file->dir; + search.next = NULL; + search.prev = NULL; + searchptr = &search; + } + + newfile = dtc_open_file(filename, searchptr); + + incl_file = xmalloc(sizeof(struct incl_file)); + + /* + * Save current context. + */ + incl_file->yy_prev_buf = YY_CURRENT_BUFFER; + incl_file->yy_prev_lineno = yylineno; + incl_file->file = srcpos_file; + incl_file->prev = incl_file_stack; + + incl_file_stack = incl_file; + + /* + * Establish new context. + */ + srcpos_file = newfile; + yylineno = 1; + yyin = newfile->file; + yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE)); +} + + +static int pop_input_file(void) +{ + struct incl_file *incl_file; + + if (incl_file_stack == 0) + return 0; + + dtc_close_file(srcpos_file); + + /* + * Pop. + */ + --incl_depth; + incl_file = incl_file_stack; + incl_file_stack = incl_file->prev; + + /* + * Recover old context. + */ + yy_delete_buffer(YY_CURRENT_BUFFER); + yy_switch_to_buffer(incl_file->yy_prev_buf); + yylineno = incl_file->yy_prev_lineno; + srcpos_file = incl_file->file; + yyin = incl_file->file ? incl_file->file->file : NULL; + + /* + * Free old state. + */ + free(incl_file); + + return 1; +} |
