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authorJoseph Myers <joseph@codesourcery.com>2023-05-11 10:07:00 +0200
committerTobias Burnus <tobias@codesourcery.com>2023-05-11 10:08:50 +0200
commitc49d51fa8134f6c7e6c7cf6e4e3007c4fea617c5 (patch)
treea8c22969127dd684e5f417daf7b0620dfb70163b /include
parent5e05361e2fef586b0e04ee81220ad0217401cc4d (diff)
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Implement LDPT_REGISTER_CLAIM_FILE_HOOK_V2 linker plugin hook [PR109128]
This is one part of the fix for PR109128, along with a corresponding binutils's linker change. Without this patch, what happens in the linker, when an unused object in a .a file has offload data, is that elf_link_is_defined_archive_symbol calls bfd_link_plugin_object_p, which ends up calling the plugin's claim_file_handler, which then records the object as one with offload data. That is, the linker never decides to use the object in the first place, but use of this _p interface (called as part of trying to decide whether to use the object) results in the plugin deciding to use its offload data (and a consequent mismatch in the offload data present at runtime). The new hook allows the linker plugin to distinguish calls to claim_file_handler that know the object is being used by the linker (from ldmain.c:add_archive_element), from calls that don't know it's being used by the linker (from elf_link_is_defined_archive_symbol); in the latter case, the plugin should avoid recording the object as one with offload data. PR middle-end/109128 include/ * plugin-api.h (ld_plugin_claim_file_handler_v2) (ld_plugin_register_claim_file_v2) (LDPT_REGISTER_CLAIM_FILE_HOOK_V2): New. (struct ld_plugin_tv): Add tv_register_claim_file_v2. lto-plugin/ * lto-plugin.c (register_claim_file_v2): New. (claim_file_handler_v2): New. (claim_file_handler): Wrap claim_file_handler_v2. (onload): Handle LDPT_REGISTER_CLAIM_FILE_HOOK_V2.
Diffstat (limited to 'include')
-rw-r--r--include/plugin-api.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/plugin-api.h b/include/plugin-api.h
index 379828b..395d5bc 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -260,6 +260,13 @@ enum ld_plugin_status
(*ld_plugin_claim_file_handler) (
const struct ld_plugin_input_file *file, int *claimed);
+/* The plugin library's "claim file" handler, version 2. */
+
+typedef
+enum ld_plugin_status
+(*ld_plugin_claim_file_handler_v2) (
+ const struct ld_plugin_input_file *file, int *claimed, int known_used);
+
/* The plugin library's "all symbols read" handler. */
typedef
@@ -278,6 +285,13 @@ typedef
enum ld_plugin_status
(*ld_plugin_register_claim_file) (ld_plugin_claim_file_handler handler);
+/* The linker's interface for registering the "claim file" handler,
+ version 2. */
+
+typedef
+enum ld_plugin_status
+(*ld_plugin_register_claim_file_v2) (ld_plugin_claim_file_handler_v2 handler);
+
/* The linker's interface for registering the "all symbols read" handler. */
typedef
@@ -553,6 +567,7 @@ enum ld_plugin_tag
LDPT_GET_WRAP_SYMBOLS,
LDPT_ADD_SYMBOLS_V2,
LDPT_GET_API_VERSION,
+ LDPT_REGISTER_CLAIM_FILE_HOOK_V2
};
/* The plugin transfer vector. */
@@ -565,6 +580,7 @@ struct ld_plugin_tv
int tv_val;
const char *tv_string;
ld_plugin_register_claim_file tv_register_claim_file;
+ ld_plugin_register_claim_file_v2 tv_register_claim_file_v2;
ld_plugin_register_all_symbols_read tv_register_all_symbols_read;
ld_plugin_register_cleanup tv_register_cleanup;
ld_plugin_add_symbols tv_add_symbols;