* [PATCH] add -ltrans-objects lto-plugin debug option
@ 2021-06-22 6:49 Richard Biener
2021-06-24 14:31 ` Jeff Law
0 siblings, 1 reply; 2+ messages in thread
From: Richard Biener @ 2021-06-22 6:49 UTC (permalink / raw)
To: gcc-patches; +Cc: hubicka, jakub, hjl.tools
This adds a -ltrans-objects option to lto-plugin that by-passes
lto-wrapper invocation and instead feeds LD the final LTRANS objects
directly from the response file given as argument to the option.
This allows LD issues involving the linker-plugin path to be
debugged in an easier way with just the IR objects (their symtab)
and the LTRANS objects as testcase.
I've tested the path re-building stage2 build/genmatch from an
LTO bootstrap and got a bit-identical executable by adding
-plugin-opt=-ltrans-objects=y to the original collect2 invocation,
seeding y with the final objects as printed by building genmatch
with -save-temps -v.
Bootstrapped and tested on x86_64-unknown-linux-gnu.
OK?
2021-06-22 Richard Biener <rguenther@suse.de>
lto-plugin/
* lto-plugin.c (ltrans_objects): New global.
(all_symbols_read_handler): If -ltrans-objects was specified,
add the output files from the specified file directly.
(process_option): Handle -ltrans-objects.
---
lto-plugin/lto-plugin.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/lto-plugin/lto-plugin.c b/lto-plugin/lto-plugin.c
index ff79f4ac462..6ab9822f369 100644
--- a/lto-plugin/lto-plugin.c
+++ b/lto-plugin/lto-plugin.c
@@ -190,6 +190,8 @@ static int lto_wrapper_num_args;
static char **pass_through_items = NULL;
static unsigned int num_pass_through_items;
+static char *ltrans_objects = NULL;
+
static bool debug;
static bool save_temps;
static bool verbose;
@@ -739,6 +741,14 @@ all_symbols_read_handler (void)
return LDPS_OK;
}
+ if (ltrans_objects)
+ {
+ FILE *objs = fopen (ltrans_objects, "r");
+ add_output_files (objs);
+ fclose (objs);
+ return LDPS_OK;
+ }
+
lto_argv = (char **) xcalloc (sizeof (char *), num_lto_args);
lto_arg_ptr = (const char **) lto_argv;
assert (lto_wrapper_argv);
@@ -1345,6 +1355,8 @@ process_option (const char *option)
break;
}
}
+ else if (startswith (option, "-ltrans-objects="))
+ ltrans_objects = xstrdup (option + strlen ("-ltrans-objects="));
else
{
int size;
--
2.26.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] add -ltrans-objects lto-plugin debug option
2021-06-22 6:49 [PATCH] add -ltrans-objects lto-plugin debug option Richard Biener
@ 2021-06-24 14:31 ` Jeff Law
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Law @ 2021-06-24 14:31 UTC (permalink / raw)
To: Richard Biener, gcc-patches; +Cc: jakub, hubicka
On 6/22/2021 12:49 AM, Richard Biener wrote:
> This adds a -ltrans-objects option to lto-plugin that by-passes
> lto-wrapper invocation and instead feeds LD the final LTRANS objects
> directly from the response file given as argument to the option.
> This allows LD issues involving the linker-plugin path to be
> debugged in an easier way with just the IR objects (their symtab)
> and the LTRANS objects as testcase.
>
> I've tested the path re-building stage2 build/genmatch from an
> LTO bootstrap and got a bit-identical executable by adding
> -plugin-opt=-ltrans-objects=y to the original collect2 invocation,
> seeding y with the final objects as printed by building genmatch
> with -save-temps -v.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu.
>
> OK?
>
> 2021-06-22 Richard Biener <rguenther@suse.de>
>
> lto-plugin/
> * lto-plugin.c (ltrans_objects): New global.
> (all_symbols_read_handler): If -ltrans-objects was specified,
> add the output files from the specified file directly.
> (process_option): Handle -ltrans-objects.
OK
jeff
^ permalink raw reply [flat|nested] 2+ messages in thread
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