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[PATCH 4/7] New commands for loading and unloading a reader.
- From: Sanjoy Das <sanjoy at playingwithpointers dot com>
- To: gdb-patches at sourceware dot org
- Cc: Sanjoy Das <sanjoy at playingwithpointers dot com>
- Date: Sat, 27 Aug 2011 18:42:13 +0530
- Subject: [PATCH 4/7] New commands for loading and unloading a reader.
- References: <1314450736-19389-1-git-send-email-sanjoy@playingwithpointers.com>
Introduces two new GDB commands - `load-jit-reader' and
`unload-jit-reader'.
gdb/ChangeLog:
* gdb/jit.c: Include gdb-dlfcn.h.
(loaded_jit_reader, reader_init_fn_sym): New static variables.
(jit_reader_load, jit_reader_load_command)
(jit_reader_unload_command): New functions.
(_initialize_jit): Add commands "jit-reader-load" and
"jit-reader-unload".
---
gdb/ChangeLog | 9 +++++
gdb/jit.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 3536807..78076ef 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
2011-08-27 Sanjoy Das <sdas@igalia.com>
+ * gdb/jit.c: Include gdb-dlfcn.h.
+ (loaded_jit_reader, reader_init_fn_sym): New static variables.
+ (jit_reader_load, jit_reader_load_command)
+ (jit_reader_unload_command): New functions.
+ (_initialize_jit): Add commands "jit-reader-load" and
+ "jit-reader-unload".
+
+2011-08-27 Sanjoy Das <sdas@igalia.com>
+
* gdb/Makefile.in: Add gdb-dlfcn.c and gdb-dlfcn.h to build
system.
* gdb/config.in: Add new #define HAVE_LIBDL.
diff --git a/gdb/jit.c b/gdb/jit.c
index cab27a9..4fc5819 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -31,6 +31,7 @@
#include "symfile.h"
#include "symtab.h"
#include "target.h"
+#include "gdb-dlfcn.h"
#include "gdb_stat.h"
static const char *jit_reader_dir = NULL;
@@ -115,6 +116,97 @@ mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb)
return 0;
}
+/* One reader that has been loaded successfully, and can potentially be used to
+ parse debug info. */
+
+static struct jit_reader
+{
+ struct gdb_reader_funcs *functions;
+} *loaded_jit_reader = NULL;
+
+typedef struct gdb_reader_funcs * (reader_init_fn_type) (void);
+static const char *reader_init_fn_sym = "gdb_init_reader";
+
+/* Try to load FILE_NAME as a JIT debug info reader. */
+
+static struct jit_reader *
+jit_reader_load (const char *file_name)
+{
+ void *so;
+ reader_init_fn_type *init_fn;
+ struct jit_reader *new_reader = NULL;
+ struct gdb_reader_funcs *funcs = NULL;
+ struct cleanup *old_cleanups;
+
+ if (jit_debug)
+ fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"),
+ file_name);
+ so = gdb_dlopen (file_name);
+ old_cleanups = make_cleanup_dlclose (so);
+
+ init_fn = gdb_dlsym (so, reader_init_fn_sym);
+ if (!init_fn)
+ error(_("Could not locate initialization function: %s."),
+ reader_init_fn_sym);
+
+ if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL)
+ error(_("Reader not GPL compatible."));
+
+ funcs = init_fn ();
+ if (funcs->reader_version != GDB_READER_INTERFACE_VERSION)
+ error(_("Reader version does not match GDB version."));
+
+ new_reader = XZALLOC (struct jit_reader);
+ new_reader->functions = funcs;
+
+ discard_cleanups (old_cleanups);
+ return new_reader;
+}
+
+/* Provides the jit-reader-load command. */
+
+static void
+jit_reader_load_command (char *args, int from_tty)
+{
+ char so_name[PATH_MAX];
+ int len;
+
+ if (args == NULL)
+ {
+ error (_("No reader name provided."));
+ return;
+ }
+
+ if (loaded_jit_reader != NULL)
+ {
+ error (_("JIT reader already loaded. Run jit-reader-unload first."));
+ return;
+ }
+
+ len = strlen (jit_reader_dir);
+ strcpy(so_name, jit_reader_dir);
+ so_name[len] = '/';
+ so_name[len + 1] = 0;
+
+ strncat (so_name, args, PATH_MAX - (len + 1));
+ loaded_jit_reader = jit_reader_load (so_name);
+}
+
+/* Provides the jit-reader-unload command. */
+
+static void
+jit_reader_unload_command (char *args, int from_tty)
+{
+ if (!loaded_jit_reader)
+ {
+ error(_("No JIT reader loaded."));
+ return;
+ }
+ loaded_jit_reader->functions->destroy (loaded_jit_reader->functions);
+ free (loaded_jit_reader);
+ loaded_jit_reader = NULL;
+}
+
/* Open a BFD from the target's memory. */
static struct bfd *
@@ -566,4 +658,15 @@ _initialize_jit (void)
jit_objfile_data = register_objfile_data ();
jit_inferior_data =
register_inferior_data_with_cleanup (jit_inferior_data_cleanup);
+ add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\
+Load FILE as debug info reader and unwinder for JIT compiled code.\n\
+Try to load file FILE as a debug info reader (and unwinder) for\n\
+JIT compiled code. The file is loaded from\n\
+" JIT_READER_DIR ", relocated \n\
+relative to the GDB executable if required.\n\
+Usage is `jit-reader-load FILE`."));
+ add_com ("jit-reader-unload", no_class, jit_reader_unload_command, _("\
+Unload the currently loaded JIT debug info reader.\n\
+See jit-reader-load for how to load JIT debug readers.\n\
+"));
}
--
1.7.5.4