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authorJoseph Myers <joseph@codesourcery.com>2023-05-11 14:31:09 +0000
committerJoseph Myers <joseph@codesourcery.com>2023-05-11 14:31:09 +0000
commitb21318bd2c29fcca8f99c1de7facdaa5cb2e66e2 (patch)
treee1c2baacc959a91de68e4625ec356c85ea929c5a /bfd/plugin.c
parent38b95a529385e32adc39428231c6fc8b0e8d6f21 (diff)
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Add LDPT_REGISTER_CLAIM_FILE_HOOK_V2 linker plugin hook [GCC PR109128]
This is one part of the fix for GCC PR109128, along with a corresponding GCC 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. bfd/ * plugin.c (struct plugin_list_entry): Add claim_file_v2. (register_claim_file_v2): New. (try_load_plugin): Use LDPT_REGISTER_CLAIM_FILE_HOOK_V2. (ld_plugin_object_p): Take second argument. (bfd_link_plugin_object_p): Update call to ld_plugin_object_p. (register_ld_plugin_object_p): Update argument prototype. (bfd_plugin_object_p): Update call to ld_plugin_object_p. * plugin.h (register_ld_plugin_object_p): Update argument prototype. 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. ld/ * plugin.c (struct plugin): Add claim_file_handler_v2. (LDPT_REGISTER_CLAIM_FILE_HOOK_V2): New. (plugin_object_p): Add second argument. Update call to plugin_call_claim_file. (register_claim_file_v2): New. (set_tv_header): Handle LDPT_REGISTER_CLAIM_FILE_HOOK_V2. (plugin_call_claim_file): Add argument known_used. (plugin_maybe_claim): Update call to plugin_object_p. * testplug.c, testplug2.c, testplug3.c, testplug4.c: Handle LDPT_REGISTER_CLAIM_FILE_HOOK_V2. * testsuite/ld-plugin/plugin-1.d, testsuite/ld-plugin/plugin-10.d, testsuite/ld-plugin/plugin-11.d, testsuite/ld-plugin/plugin-13.d, testsuite/ld-plugin/plugin-14.d, testsuite/ld-plugin/plugin-15.d, testsuite/ld-plugin/plugin-16.d, testsuite/ld-plugin/plugin-17.d, testsuite/ld-plugin/plugin-18.d, testsuite/ld-plugin/plugin-19.d, testsuite/ld-plugin/plugin-2.d, testsuite/ld-plugin/plugin-26.d, testsuite/ld-plugin/plugin-3.d, testsuite/ld-plugin/plugin-30.d, testsuite/ld-plugin/plugin-4.d, testsuite/ld-plugin/plugin-5.d, testsuite/ld-plugin/plugin-6.d, testsuite/ld-plugin/plugin-7.d, testsuite/ld-plugin/plugin-8.d, testsuite/ld-plugin/plugin-9.d: Update test expectations.
Diffstat (limited to 'bfd/plugin.c')
-rw-r--r--bfd/plugin.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/bfd/plugin.c b/bfd/plugin.c
index 66d286a..b798d34 100644
--- a/bfd/plugin.c
+++ b/bfd/plugin.c
@@ -129,6 +129,7 @@ struct plugin_list_entry
{
/* These must be initialized for each IR object with LTO wrapper. */
ld_plugin_claim_file_handler claim_file;
+ ld_plugin_claim_file_handler_v2 claim_file_v2;
ld_plugin_all_symbols_read_handler all_symbols_read;
ld_plugin_all_symbols_read_handler cleanup_handler;
bool has_symbol_type;
@@ -159,6 +160,16 @@ register_claim_file (ld_plugin_claim_file_handler handler)
return LDPS_OK;
}
+
+/* Register a claim-file handler, version 2. */
+
+static enum ld_plugin_status
+register_claim_file_v2 (ld_plugin_claim_file_handler_v2 handler)
+{
+ current_plugin->claim_file_v2 = handler;
+ return LDPS_OK;
+}
+
static enum ld_plugin_status
add_symbols (void * handle,
int nsyms,
@@ -337,7 +348,7 @@ try_load_plugin (const char *pname,
bool build_list_p)
{
void *plugin_handle;
- struct ld_plugin_tv tv[5];
+ struct ld_plugin_tv tv[6];
int i;
ld_plugin_onload onload;
enum ld_plugin_status status;
@@ -403,6 +414,10 @@ try_load_plugin (const char *pname,
tv[i].tv_u.tv_register_claim_file = register_claim_file;
++i;
+ tv[i].tv_tag = LDPT_REGISTER_CLAIM_FILE_HOOK_V2;
+ tv[i].tv_u.tv_register_claim_file_v2 = register_claim_file_v2;
+
+ ++i;
tv[i].tv_tag = LDPT_ADD_SYMBOLS;
tv[i].tv_u.tv_add_symbols = add_symbols;
@@ -439,7 +454,7 @@ try_load_plugin (const char *pname,
/* There may be plugin libraries in lib/bfd-plugins. */
static int has_plugin_list = -1;
-static bfd_cleanup (*ld_plugin_object_p) (bfd *);
+static bfd_cleanup (*ld_plugin_object_p) (bfd *, bool);
static const char *plugin_name;
@@ -463,7 +478,7 @@ bool
bfd_link_plugin_object_p (bfd *abfd)
{
if (ld_plugin_object_p)
- return ld_plugin_object_p (abfd) != NULL;
+ return ld_plugin_object_p (abfd, false) != NULL;
return false;
}
@@ -480,7 +495,7 @@ bfd_plugin_target_p (const bfd_target *target)
/* Register OBJECT_P to be used by bfd_plugin_object_p. */
void
-register_ld_plugin_object_p (bfd_cleanup (*object_p) (bfd *))
+register_ld_plugin_object_p (bfd_cleanup (*object_p) (bfd *, bool))
{
ld_plugin_object_p = object_p;
}
@@ -572,7 +587,7 @@ static bfd_cleanup
bfd_plugin_object_p (bfd *abfd)
{
if (ld_plugin_object_p)
- return ld_plugin_object_p (abfd);
+ return ld_plugin_object_p (abfd, false);
if (abfd->plugin_format == bfd_plugin_unknown && !load_plugin (abfd))
return NULL;