[Ada] Preliminary work in improving dwarf2 support

[Arnaud Charlet]

Tested on i686-linux, committed on trunk

Preparatory work to improve the DWARF information emitted by GNAT to
debug Ada code.

2006-02-13  Nicolas Setton  <setton@adacore.com>

	* adadecode.h, adadecode.c: (__gnat_decode): Improve support of types.
	(get_encoding): New subprogram. Extracts the encodings from an encoded
	Ada name.

-------------- next part --------------
Index: adadecode.h
===================================================================
--- adadecode.h	(revision 110833)
+++ adadecode.h	(working copy)
@@ -6,7 +6,7 @@
  *                                                                          *
  *                              C Header File                               *
  *                                                                          *
- *           Copyright (C) 2001-2003, Free Software Foundation, Inc.        *
+ *           Copyright (C) 2001-2006, Free Software Foundation, Inc.        *
  *                                                                          *
  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  * terms of the  GNU General Public License as published  by the Free Soft- *
@@ -33,8 +33,8 @@
 /* This function will return the Ada name from the encoded form.
    The Ada coding is done in exp_dbug.ads and this is the inverse function.
    see exp_dbug.ads for full encoding rules, a short description is added
-   below. Right now only objects and routines are handled. There is no support
-   for Ada types.
+   below. Objects and routines are fully handled; types are stripped of their
+   encodings.
 
    CODED_NAME is the encoded entity name.
    ADA_NAME is a pointer to a buffer, it will receive the Ada name. A safe
@@ -44,6 +44,10 @@
    added at the end of the Ada name and surrounded by ( and ).  */
 extern void __gnat_decode (const char *, char *, int);
 
+/* This function will return the GNAT encodings, in a colon-separated list,
+   from the encoded form. The Ada encodings are described in exp_dbug.ads.  */
+extern void get_encoding (const char *, char *);
+
 /* ada_demangle is added for COMPATIBILITY ONLY. It has the name of the
    function used in the binutils and GDB. Always consider using __gnat_decode
    instead of ada_demangle. Caller must free the pointer returned.  */
Index: adadecode.c
===================================================================
--- adadecode.c	(revision 110833)
+++ adadecode.c	(working copy)
@@ -6,7 +6,7 @@
  *                                                                          *
  *                          C Implementation File                           *
  *                                                                          *
- *           Copyright (C) 2001-2003, Free Software Foundation, Inc.        *
+ *           Copyright (C) 2001-2006, Free Software Foundation, Inc.        *
  *                                                                          *
  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  * terms of the  GNU General Public License as published  by the Free Soft- *
@@ -98,8 +98,8 @@
 /* This function will return the Ada name from the encoded form.
    The Ada coding is done in exp_dbug.ads and this is the inverse function.
    see exp_dbug.ads for full encoding rules, a short description is added
-   below. Right now only objects and routines are handled. There is no support
-   for Ada types.
+   below. Right now only objects and routines are handled. Ada types are
+   stripped of their encodings.
 
    CODED_NAME is the encoded entity name.
 
@@ -159,6 +159,18 @@
   else
     strcpy (ada_name, coded_name);
 
+  /* Check for the first triple underscore in the name. This indicates
+     that the name represents a type with encodings; in this case, we
+     need to strip the encodings.  */
+  {
+    char *encodings;
+
+    if ((encodings = (char *) strstr (ada_name, "___")) != NULL)
+      {
+	*encodings = '\0';
+      }
+  }
+
   /* Check for task body.  */
   if (has_suffix (ada_name, "TKB"))
     {
@@ -321,3 +333,43 @@
   __gnat_decode (coded_name, ada_name, 0);
   return xstrdup (ada_name);
 }
+
+void
+get_encoding (const char *coded_name, char *encoding)
+{
+  char * dest_index = encoding;
+  const char *p;
+  int found = 0;
+  int count = 0;
+
+  /* The heuristics is the following: we assume that the first triple
+     underscore in an encoded name indicates the beginning of the
+     first encoding, and that subsequent triple underscores indicate
+     the next encodings. We assume that the encodings are always at the
+     end of encoded names.  */
+
+  for (p = coded_name; *p != '\0'; p++)
+    {
+      if (*p != '_')
+	count = 0;
+      else
+	if (++count == 3)
+	  {
+	    count = 0;
+
+	    if (found)
+	      {
+		dest_index = dest_index - 2;
+		*dest_index++ = ':';
+	      }
+
+	    p++;
+	    found = 1;
+	  }
+
+      if (found)
+	*dest_index++ = *p;
+    }
+
+  *dest_index = '\0';
+}