From 128bf1fe608badb59d27f9c5c8ffb1a6a6d9d811 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Tue, 6 Aug 2019 15:40:08 +0930 Subject: [PATCH] LTO object insertion point This is a mostly cosmetic fix for cases like PR24873 where LTO recompiled objects were supposed to be inserted inside a group. The specific case handled by this patch is when the first file inside a group is an archive, the first file claimed by the plugin. Prior to this patch we would have inserted the recompiled objects before the group, which doesn't matter really since the entire group will be reloaded, but it looks a little wrong in map files. PR 24873 * ldlang.c (find_replacements_insert_point): Return "before" flag. (find_next_input_statement): New function. (lang_process): When placing recompiled LTO objects before a claimed archive, place them immediately before in the statement list. --- ld/ChangeLog | 9 +++++++++ ld/ldlang.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 62 insertions(+), 6 deletions(-) diff --git a/ld/ChangeLog b/ld/ChangeLog index 8f9d1f0..563e482 100644 --- a/ld/ChangeLog +++ b/ld/ChangeLog @@ -1,6 +1,15 @@ 2019-08-06 Alan Modra PR 24873 + * ldlang.c (find_replacements_insert_point): Return "before" flag. + (find_next_input_statement): New function. + (lang_process): When placing recompiled LTO objects before a + claimed archive, place them immediately before in the statement + list. + +2019-08-06 Alan Modra + + PR 24873 * ldlang.c (plugin_undefs): New static var. (open_input_bfds ): Loop on plugin_undefs and hitting plugin_insert point. diff --git a/ld/ldlang.c b/ld/ldlang.c index b88c841..8119cfc 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -7226,7 +7226,7 @@ lang_relax_sections (bfd_boolean need_layout) inserted at the head of the file_chain. */ static lang_input_statement_type * -find_replacements_insert_point (void) +find_replacements_insert_point (bfd_boolean *before) { lang_input_statement_type *claim1, *lastobject; lastobject = &input_file_chain.head->input_statement; @@ -7235,7 +7235,10 @@ find_replacements_insert_point (void) claim1 = &claim1->next->input_statement) { if (claim1->flags.claimed) - return claim1->flags.claim_archive ? lastobject : claim1; + { + *before = claim1->flags.claim_archive; + return claim1->flags.claim_archive ? lastobject : claim1; + } /* Update lastobject if this is a real object file. */ if (claim1->the_bfd != NULL && claim1->the_bfd->my_archive == NULL) lastobject = claim1; @@ -7243,6 +7246,7 @@ find_replacements_insert_point (void) /* No files were claimed by the plugin. Choose the last object file found on the list (maybe the first, dummy entry) as the insert point. */ + *before = FALSE; return lastobject; } @@ -7323,6 +7327,35 @@ lang_list_remove_tail (lang_statement_list_type *destlist, destlist->tail = savetail; *savetail = NULL; } + +static lang_statement_union_type ** +find_next_input_statement (lang_statement_union_type **s) +{ + for ( ; *s; s = &(*s)->header.next) + { + lang_statement_union_type **t; + switch ((*s)->header.type) + { + case lang_input_statement_enum: + return s; + case lang_wild_statement_enum: + t = &(*s)->wild_statement.children.head; + break; + case lang_group_statement_enum: + t = &(*s)->group_statement.children.head; + break; + case lang_output_section_statement_enum: + t = &(*s)->output_section_statement.children.head; + break; + default: + continue; + } + t = find_next_input_statement (t); + if (*t) + return t; + } + return s; +} #endif /* ENABLE_PLUGINS */ /* Add NAME to the list of garbage collection entry points. */ @@ -7447,16 +7480,30 @@ lang_process (void) if (added.head != NULL) { /* If so, we will insert them into the statement list immediately - after the first input file that was claimed by the plugin. */ - plugin_insert = find_replacements_insert_point (); + after the first input file that was claimed by the plugin, + unless that file was an archive in which case it is inserted + immediately before. */ + bfd_boolean before; + lang_statement_union_type **prev; + plugin_insert = find_replacements_insert_point (&before); /* If a plugin adds input files without having claimed any, we don't really have a good idea where to place them. Just putting them at the start or end of the list is liable to leave them outside the crtbegin...crtend range. */ ASSERT (plugin_insert != NULL); /* Splice the new statement list into the old one. */ - lang_list_insert_after (stat_ptr, &added, - &plugin_insert->header.next); + prev = &plugin_insert->header.next; + if (before) + { + prev = find_next_input_statement (prev); + if (*prev != plugin_insert->next_real_file) + { + /* Huh? We didn't find the expected input statement. */ + ASSERT (0); + prev = &plugin_insert->header.next; + } + } + lang_list_insert_after (stat_ptr, &added, prev); /* Likewise for the file chains. */ lang_list_insert_after (&input_file_chain, &inputfiles, &plugin_insert->next_real_file); -- 2.7.4