From cc5277b173701364c10204f316db28198f2c683b Mon Sep 17 00:00:00 2001
From: Martin Liska <mliska@suse.cz>
Date: Thu, 4 Jul 2019 16:39:08 +0200
Subject: Support .gnu.lto_.lto section in ELF files (PR 24768).
bfd/ChangeLog:
2019-07-22 Martin Liska <mliska@suse.cz>
PR 24768
* archive.c (_bfd_compute_and_write_armap): Come up with
report_plugin_err variable.
* bfd-in2.h (struct bfd): Add lto_slim_object flag.
* elf.c (struct lto_section): New.
(_bfd_elf_make_section_from_shdr): Parse content of
.gnu_lto_.lto section.
* elflink.c: Report error for a missing LTO plugin.
* linker.c (_bfd_generic_link_add_one_symbol): Likewise.
binutils/ChangeLog:
2019-07-22 Martin Liska <mliska@suse.cz>
PR 24768
* nm.c (filter_symbols): Set report_plugin_err if
error is reported.
(display_rel_file): Report error for a missing LTO plugin.
gold/ChangeLog:
2019-07-22 Martin Liska <mliska@suse.cz>
PR 24768
* layout.h (class Layout): Add is_lto_slim_object and
set_lto_slim_object.
* object.cc (struct lto_section): Add lto_slim_object_.
(big_endian>::do_layout): Parse content of
.gnu_lto_.lto section.
(big_endian>::do_add_symbols): Report error for a missing
LTO plugin.
---
gold/ChangeLog | 11 +++++++++++
gold/layout.h | 10 ++++++++++
gold/object.cc | 31 ++++++++++++++++++++++++++++++-
3 files changed, 51 insertions(+), 1 deletion(-)
(limited to 'gold')
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 67f9088..754d0e3 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,14 @@
+2019-07-29 Martin Liska <mliska@suse.cz>
+
+ PR 24768
+ * layout.h (class Layout): Add is_lto_slim_object and
+ set_lto_slim_object.
+ * object.cc (struct lto_section): Add lto_slim_object_.
+ (big_endian>::do_layout): Parse content of
+ .gnu_lto_.lto section.
+ (big_endian>::do_add_symbols): Report error for a missing
+ LTO plugin.
+
2019-07-13 Alan Modra <amodra@gmail.com>
* powerpc.cc (xlate_pcrel_opt): New function.
diff --git a/gold/layout.h b/gold/layout.h
index bfd44e1..b9b7581 100644
--- a/gold/layout.h
+++ b/gold/layout.h
@@ -593,6 +593,14 @@ class Layout
set_unique_segment_for_sections_specified()
{ this->unique_segment_for_sections_specified_ = true; }
+ bool
+ is_lto_slim_object () const
+ { return this->lto_slim_object_; }
+
+ void
+ set_lto_slim_object ()
+ { this->lto_slim_object_ = true; }
+
// For incremental updates, allocate a block of memory from the
// free list. Find a block starting at or after MINOFF.
off_t
@@ -1480,6 +1488,8 @@ class Layout
Incremental_inputs* incremental_inputs_;
// Whether we record output section data created in script
bool record_output_section_data_from_script_;
+ // Set if this is a slim LTO object not loaded with a compiler plugin
+ bool lto_slim_object_;
// List of output data that needs to be removed at relaxation clean up.
Output_section_data_list script_output_section_data_list_;
// Structure to save segment states before entering the relaxation loop.
diff --git a/gold/object.cc b/gold/object.cc
index 689448f..86c519a 100644
--- a/gold/object.cc
+++ b/gold/object.cc
@@ -1380,6 +1380,18 @@ Sized_relobj_file<size, big_endian>::layout_gnu_property_section(
}
}
+// This a copy of lto_section defined in GCC (lto-streamer.h)
+
+struct lto_section
+{
+ int16_t major_version;
+ int16_t minor_version;
+ unsigned char slim_object;
+
+ /* Flags is a private field that is not defined publicly. */
+ uint16_t flags;
+};
+
// Lay out the input sections. We walk through the sections and check
// whether they should be included in the link. If they should, we
// pass them to the Layout object, which will return an output section
@@ -1865,6 +1877,19 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab,
debug_types_sections.push_back(i);
}
}
+
+ /* GCC uses .gnu.lto_.lto.<some_hash> as a LTO bytecode information
+ section. */
+ const char *lto_section_name = ".gnu.lto_.lto.";
+ if (strncmp (name, lto_section_name, strlen (lto_section_name)) == 0)
+ {
+ section_size_type contents_len;
+ const unsigned char* pcontents = this->section_contents(i, &contents_len, false);
+ struct lto_section lsection = *(const lto_section*)pcontents;
+ if (lsection.slim_object)
+ gold_info(_("%s: plugin needed to handle lto object"),
+ this->name().c_str());
+ }
}
if (!is_pass_two)
@@ -2083,7 +2108,7 @@ template<int size, bool big_endian>
void
Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab,
Read_symbols_data* sd,
- Layout*)
+ Layout* layout)
{
if (sd->symbols == NULL)
{
@@ -2102,6 +2127,10 @@ Sized_relobj_file<size, big_endian>::do_add_symbols(Symbol_table* symtab,
this->symbols_.resize(symcount);
+ if (layout->is_lto_slim_object ())
+ gold_info(_("%s: plugin needed to handle lto object"),
+ this->name().c_str());
+
const char* sym_names =
reinterpret_cast<const char*>(sd->symbol_names->data());
symtab->add_from_relobj(this,
--
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