Re: [patch] Fix some plugin API issues in BFD

[Rafael Ávila de Espíndola <respindola at mozilla dot com>]

An updated patch is attached that also avoids calling onload multiple times.

2010-02-20  Rafael Ávila de Espíndola <respindola@mozilla.com>

        * plugin.c (bfd_plugin_object_p): Correctly set the filesize
	and handle claim_file seeking. Only try to load the plugin once.

On 2011-02-08 22:17, Rafael Ávila de Espíndola wrote:
> I recently updated a plugin to use the file descriptor directly. This
> worked fine in gold, but had two issues using bfd (nm and ar):
> 
> *) The filesize was not being set.
> *) The code expected the claim_file callback to not seek.
> 
> That is not my understanding from reading the api documentation in
> http://gcc.gnu.org/wiki/whopr/driver, so the attached patch fixes both
> issues.

Cheers,
Rafael

diff --git a/bfd/plugin.c b/bfd/plugin.c
index 30a4923..224d0e2 100644
--- a/bfd/plugin.c
+++ b/bfd/plugin.c
@@ -232,16 +232,21 @@ static const bfd_target *
 bfd_plugin_object_p (bfd *abfd)
 {
   int claimed = 0;
-  int t = load_plugin ();
   struct ld_plugin_input_file file;
   bfd *iobfd;
-
-  if (!t)
+  static int have_loaded = 0;
+  static int have_plugin = 0;
+  if (!have_loaded)
+    {
+      have_loaded = 1;
+      have_plugin = load_plugin ();
+    }
+  if (!have_plugin)
     return NULL;
 
   file.name = abfd->filename;
 
-  if (abfd->my_archive)
+  if (abfd->format == bfd_archive)
     {
       iobfd = abfd->my_archive;
       file.offset = abfd->origin;
@@ -251,7 +256,7 @@ bfd_plugin_object_p (bfd *abfd)
     {
       iobfd = abfd;
       file.offset = 0;
-      file.filesize = 0; /*FIXME*/
+      file.filesize = 0;
     }
 
   if (!iobfd->iostream && !bfd_open_file (iobfd))
@@ -259,8 +264,18 @@ bfd_plugin_object_p (bfd *abfd)
 
   file.fd = fileno ((FILE *) iobfd->iostream);
 
+  if (abfd->format == bfd_object)
+    {
+      struct stat stat_buf;
+      if (fstat (file.fd, &stat_buf))
+        return NULL;
+      file.filesize = stat_buf.st_size;
+    }
+
   file.handle = abfd;
+  off_t cur_offset = lseek(file.fd, 0, SEEK_CUR);
   claim_file (&file, &claimed);
+  lseek(file.fd, cur_offset, SEEK_SET);
   if (!claimed)
     return NULL;