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[PATCH 1/2] Introduce new function exec_file_find


This commit adds a new function, exec_file_find, which computes the
full pathname of the main executable in much the same way solib_find
does for pathnames of shared libraries.  The bulk of the existing
solib_find was moved into a new static function solib_find_1, with
exec_file_find and solib_find being small wrappers for solib_find_1.

gdb/ChangeLog:

	* solist.h (exec_file_find): New declaration.
	* solib.c (solib_find_1): New function.
	(solib_find): Moved most logic into the above.
	(exec_file_find): New function.
---
 gdb/ChangeLog |    7 +++
 gdb/solib.c   |  147 ++++++++++++++++++++++++++++++++++++++------------------
 gdb/solist.h  |    3 +
 3 files changed, 110 insertions(+), 47 deletions(-)

diff --git a/gdb/solib.c b/gdb/solib.c
index 98d5cfd..fc8be01 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -112,69 +112,47 @@ show_solib_search_path (struct ui_file *file, int from_tty,
 #  define DOS_BASED_FILE_SYSTEM 0
 #endif
 
-/* Returns the full pathname of the shared library file, or NULL if
-   not found.  (The pathname is malloc'ed; it needs to be freed by the
-   caller.)  *FD is set to either -1 or an open file handle for the
-   library.
+/* Return the full pathname of a binary file (the main executable
+   or a shared library file), or NULL if not found.  The returned
+   pathname is malloc'ed and must be freed by the caller.  *FD is
+   set to either -1 or an open file handle for the binary file.
 
    Global variable GDB_SYSROOT is used as a prefix directory
-   to search for shared libraries if they have an absolute path.
+   to search for binary files if they have an absolute path.
 
    Global variable SOLIB_SEARCH_PATH is used as a prefix directory
    (or set of directories, as in LD_LIBRARY_PATH) to search for all
-   shared libraries if not found in GDB_SYSROOT.
+   shared libraries if not found in GDB_SYSROOT.  SOLIB_SEARCH_PATH
+   is not used when searching for the main executable.
 
    Search algorithm:
    * If there is a gdb_sysroot and path is absolute:
    *   Search for gdb_sysroot/path.
    * else
    *   Look for it literally (unmodified).
-   * Look in SOLIB_SEARCH_PATH.
-   * If available, use target defined search function.
+   * If IS_SOLIB is non-zero:
+   *   Look in SOLIB_SEARCH_PATH.
+   *   If available, use target defined search function.
    * If gdb_sysroot is NOT set, perform the following two searches:
-   *   Look in inferior's $PATH.
+   *   If IS_SOLIB is non-zero:
+   *     Look in inferior's $PATH.
    *   Look in inferior's $LD_LIBRARY_PATH.
    *
    * The last check avoids doing this search when targetting remote
    * machines since gdb_sysroot will almost always be set.
 */
 
-char *
-solib_find (char *in_pathname, int *fd)
+static char *
+solib_find_1 (char *in_pathname, int *fd, int is_solib)
 {
   const struct target_so_ops *ops = solib_ops (target_gdbarch ());
   int found_file = -1;
   char *temp_pathname = NULL;
   int gdb_sysroot_is_empty;
-  const char *solib_symbols_extension
-    = gdbarch_solib_symbols_extension (target_gdbarch ());
   const char *fskind = effective_target_file_system_kind ();
   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
   char *sysroot = NULL;
 
-  /* If solib_symbols_extension is set, replace the file's
-     extension.  */
-  if (solib_symbols_extension)
-    {
-      char *p = in_pathname + strlen (in_pathname);
-
-      while (p > in_pathname && *p != '.')
-	p--;
-
-      if (*p == '.')
-	{
-	  char *new_pathname;
-
-	  new_pathname = alloca (p - in_pathname + 1
-				 + strlen (solib_symbols_extension) + 1);
-	  memcpy (new_pathname, in_pathname, p - in_pathname + 1);
-	  strcpy (new_pathname + (p - in_pathname) + 1,
-		  solib_symbols_extension);
-
-	  in_pathname = new_pathname;
-	}
-    }
-
   gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0);
 
   if (!gdb_sysroot_is_empty)
@@ -332,23 +310,26 @@ solib_find (char *in_pathname, int *fd)
 	in_pathname++;
     }
 
-  /* If not found, search the solib_search_path (if any).  */
-  if (found_file < 0 && solib_search_path != NULL)
+  /* If not found, and we're looking for a solib, search the
+     solib_search_path (if any).  */
+  if (is_solib && found_file < 0 && solib_search_path != NULL)
     found_file = openp (solib_search_path,
 			OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
 			in_pathname, O_RDONLY | O_BINARY, &temp_pathname);
 
-  /* If not found, next search the solib_search_path (if any) for the basename
-     only (ignoring the path).  This is to allow reading solibs from a path
-     that differs from the opened path.  */
-  if (found_file < 0 && solib_search_path != NULL)
+  /* If not found, and we're looking for a solib, next search the
+     solib_search_path (if any) for the basename only (ignoring the
+     path).  This is to allow reading solibs from a path that differs
+     from the opened path.  */
+  if (is_solib && found_file < 0 && solib_search_path != NULL)
     found_file = openp (solib_search_path,
 			OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH,
 			target_lbasename (fskind, in_pathname),
 			O_RDONLY | O_BINARY, &temp_pathname);
 
-  /* If not found, try to use target supplied solib search method.  */
-  if (found_file < 0 && ops->find_and_open_solib)
+  /* If not found, and we're looking for a solib, try to use target
+     supplied solib search method.  */
+  if (is_solib && found_file < 0 && ops->find_and_open_solib)
     found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY,
 					   &temp_pathname);
 
@@ -359,9 +340,9 @@ solib_find (char *in_pathname, int *fd)
 			OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
 			O_RDONLY | O_BINARY, &temp_pathname);
 
-  /* If not found, next search the inferior's $LD_LIBRARY_PATH
-     environment variable.  */
-  if (found_file < 0 && gdb_sysroot_is_empty)
+  /* If not found, and we're looking for a solib, next search the
+     inferior's $LD_LIBRARY_PATH environment variable.  */
+  if (is_solib && found_file < 0 && gdb_sysroot_is_empty)
     found_file = openp (get_in_environ (current_inferior ()->environment,
 					"LD_LIBRARY_PATH"),
 			OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
@@ -371,6 +352,78 @@ solib_find (char *in_pathname, int *fd)
   return temp_pathname;
 }
 
+/* Return the full pathname of the main executable, or NULL if not
+   found.  The returned pathname is malloc'ed and must be freed by
+   the caller.  *FD is set to either -1 or an open file handle for
+   the main executable.
+
+   The search algorithm used is described in solib_find_1's comment
+   above.  */
+
+char *
+exec_file_find (char *in_pathname, int *fd)
+{
+  char *result = solib_find_1 (in_pathname, fd, 0);
+
+  if (result == NULL)
+    {
+      const char *fskind = effective_target_file_system_kind ();
+
+      if (fskind == file_system_kind_dos_based)
+	{
+	  char *new_pathname;
+
+	  new_pathname = alloca (strlen (in_pathname) + 5);
+	  strcpy (new_pathname, in_pathname);
+	  strcat (new_pathname, ".exe");
+
+	  result = solib_find_1 (new_pathname, fd, 0);
+	}
+    }
+
+  return result;
+}
+
+/* Return the full pathname of a shared library file, or NULL if not
+   found.  The returned pathname is malloc'ed and must be freed by
+   the caller.  *FD is set to either -1 or an open file handle for
+   the shared library.
+
+   The search algorithm used is described in solib_find_1's comment
+   above.  */
+
+char *
+solib_find (char *in_pathname, int *fd)
+{
+  const char *solib_symbols_extension
+    = gdbarch_solib_symbols_extension (target_gdbarch ());
+
+  /* If solib_symbols_extension is set, replace the file's
+     extension.  */
+  if (solib_symbols_extension != NULL)
+    {
+      char *p = in_pathname + strlen (in_pathname);
+
+      while (p > in_pathname && *p != '.')
+	p--;
+
+      if (*p == '.')
+	{
+	  char *new_pathname;
+
+	  new_pathname = alloca (p - in_pathname + 1
+				 + strlen (solib_symbols_extension) + 1);
+	  memcpy (new_pathname, in_pathname, p - in_pathname + 1);
+	  strcpy (new_pathname + (p - in_pathname) + 1,
+		  solib_symbols_extension);
+
+	  in_pathname = new_pathname;
+	}
+    }
+
+  return solib_find_1 (in_pathname, fd, 1);
+}
+
 /* Open and return a BFD for the shared library PATHNAME.  If FD is not -1,
    it is used as file handle to open the file.  Throws an error if the file
    could not be opened.  Handles both local and remote file access.
diff --git a/gdb/solist.h b/gdb/solist.h
index 148bec1..7021f5c 100644
--- a/gdb/solist.h
+++ b/gdb/solist.h
@@ -176,6 +176,9 @@ void free_so (struct so_list *so);
 /* Return address of first so_list entry in master shared object list.  */
 struct so_list *master_so_list (void);
 
+/* Find main executable binary file.  */
+extern char *exec_file_find (char *in_pathname, int *fd);
+
 /* Find shared library binary file.  */
 extern char *solib_find (char *in_pathname, int *fd);
 
-- 
1.7.1


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