DTC: Add support for a C-like #include "file" mechanism.

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>

1 files changed, 71 insertions, 0 deletions

diff --git a/srcpos.h b/srcpos.h
new file mode 100644
index 0000000..d591e7e
--- /dev/null
+++ b/srcpos.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
+ *
+ * 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
+ */
+
+/*
+ * Augment the standard YYLTYPE with a filenum index into an
+ * array of all opened filenames.
+ */
+
+#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED
+typedef struct YYLTYPE {
+    int first_line;
+    int first_column;
+    int last_line;
+    int last_column;
+    int filenum;
+} YYLTYPE;
+
+#define YYLTYPE_IS_DECLARED	1
+#define YYLTYPE_IS_TRIVIAL	1
+#endif
+
+
+#define YYLLOC_DEFAULT(Current, Rhs, N)					\
+    do									\
+      if (YYID (N))							\
+	{								\
+	  (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;	\
+	  (Current).first_column = YYRHSLOC (Rhs, 1).first_column;	\
+	  (Current).last_line    = YYRHSLOC (Rhs, N).last_line;		\
+	  (Current).last_column  = YYRHSLOC (Rhs, N).last_column;	\
+	  (Current).filenum      = YYRHSLOC (Rhs, N).filenum;		\
+	}								\
+      else								\
+	{								\
+	  (Current).first_line   = (Current).last_line   =		\
+	    YYRHSLOC (Rhs, 0).last_line;				\
+	  (Current).first_column = (Current).last_column =		\
+	    YYRHSLOC (Rhs, 0).last_column;				\
+	  (Current).filenum      = YYRHSLOC (Rhs, 0).filenum;		\
+	}								\
+    while (YYID (0))
+
+
+
+
+extern int srcpos_filenum;
+
+extern int push_input_file(const char *filename);
+extern int pop_input_file(void);
+
+extern FILE *dtc_open_file(const char *fname);
+extern int lookup_file_name(const char *fname, int add_it);
+extern const char *srcpos_filename_for_num(int filenum);
+const char *srcpos_get_filename(void);
+