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e45e6fd274
Keeps track of open files in a stack, and assigns a filenum to source positions for each lexical token. Modified error reporting to show source file as well. No policy on file directory basis has been decided. Still handles stdin. Tested on all arch/powerpc/boot/dts DTS files Signed-off-by: Jon Loeliger <jdl@freescale.com>
138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
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* Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include "srcpos.h"
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/*
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* This code should only be included into the lexical analysis.
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* It references global context symbols that are only present
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* in the generated lex.yy,c file.
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*/
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#ifdef FLEX_SCANNER
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/*
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* Stack of nested include file contexts.
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*/
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struct incl_file {
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int filenum;
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FILE *file;
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YY_BUFFER_STATE yy_prev_buf;
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int yy_prev_lineno;
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struct incl_file *prev;
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};
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struct incl_file *incl_file_stack;
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/*
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* Detect infinite include recursion.
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*/
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#define MAX_INCLUDE_DEPTH (100)
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static int incl_depth = 0;
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int push_input_file(const char *filename)
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{
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FILE *f;
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struct incl_file *incl_file;
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if (!filename) {
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yyerror("No include file name given.");
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return 0;
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}
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if (incl_depth++ >= MAX_INCLUDE_DEPTH) {
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yyerror("Includes nested too deeply");
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return 0;
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}
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f = dtc_open_file(filename);
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incl_file = malloc(sizeof(struct incl_file));
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if (!incl_file) {
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yyerror("Can not allocate include file space.");
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return 0;
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}
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/*
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* Save current context.
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*/
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incl_file->yy_prev_buf = YY_CURRENT_BUFFER;
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incl_file->yy_prev_lineno = yylineno;
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incl_file->filenum = srcpos_filenum;
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incl_file->file = yyin;
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incl_file->prev = incl_file_stack;
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incl_file_stack = incl_file;
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/*
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* Establish new context.
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*/
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srcpos_filenum = lookup_file_name(filename, 0);
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yylineno = 1;
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yyin = f;
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yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
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return 1;
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}
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int pop_input_file(void)
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{
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struct incl_file *incl_file;
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if (incl_file_stack == 0)
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return 0;
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fclose(yyin);
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/*
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* Pop.
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*/
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--incl_depth;
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incl_file = incl_file_stack;
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incl_file_stack = incl_file->prev;
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/*
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* Recover old context.
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*/
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yy_delete_buffer(YY_CURRENT_BUFFER);
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yy_switch_to_buffer(incl_file->yy_prev_buf);
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yylineno = incl_file->yy_prev_lineno;
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srcpos_filenum = incl_file->filenum;
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yyin = incl_file->file;
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/*
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* Free old state.
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*/
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free(incl_file);
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if (YY_CURRENT_BUFFER == 0)
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return 0;
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return 1;
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}
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#endif /* FLEX_SCANNER */
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