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re PR lto/47247 (Linker plugin specification makes it difficult to handle COMDATs)

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PR lto/47247
	* lto-plugin.c (get_symbols_v2): New variable.
	(write_resolution): Use V2 API when available.
	(onload): Handle LDPT_GET_SYMBOLS_V2.

	* lto-symtab.c (lto_symtab_resolve_symbols): Do not resolve
	when resolution is already availbale from plugin.
	(lto_symtab_merge_decls_1): Handle LDPR_PREVAILING_DEF_IRONLY_EXP.
	* cgraph.c (ld_plugin_symbol_resolution): Add prevailing_def_ironly_exp.
	* lto-cgraph.c (LDPR_NUM_KNOWN): Update.
	* ipa.c (varpool_externally_visible_p): IRONLY variables are never
	externally visible.
	* varasm.c (resolution_to_local_definition_p): Add
	LDPR_PREVAILING_DEF_IRONLY_EXP.
	(resolution_local_p): Likewise.

	* common.c (lto_resolution_str): Add new resolution.
	* common.h (lto_resolution_str): Likewise.

From-SVN: r179424
This commit is contained in:
Jan Hubicka 2011-10-02 12:41:24 +02:00 committed by Jan Hubicka
parent 96d7b15ff3
commit ed0d2da02b
11 changed files with 60 additions and 14 deletions
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14
gcc/ChangeLog
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@ -1,3 +1,17 @@
2011-10-02 Jan Hubicka <jh@suse.cz>
PR lto/47247
* lto-symtab.c (lto_symtab_resolve_symbols): Do not resolve
when resolution is already availbale from plugin.
(lto_symtab_merge_decls_1): Handle LDPR_PREVAILING_DEF_IRONLY_EXP.
* cgraph.c (ld_plugin_symbol_resolution): Add prevailing_def_ironly_exp.
* lto-cgraph.c (LDPR_NUM_KNOWN): Update.
* ipa.c (varpool_externally_visible_p): IRONLY variables are never
externally visible.
* varasm.c (resolution_to_local_definition_p): Add
LDPR_PREVAILING_DEF_IRONLY_EXP.
(resolution_local_p): Likewise.
2011-10-01 David S. Miller <davem@davemloft.net>
* config/sparc/sparc.opt (VIS3): New option.

3
gcc/cgraph.c
View File

@ -110,7 +110,8 @@ const char * const ld_plugin_symbol_resolution_names[]=
"preempted_ir",
"resolved_ir",
"resolved_exec",
"resolved_dyn"
"resolved_dyn",
"prevailing_def_ironly_exp"
};
static void cgraph_node_remove_callers (struct cgraph_node *node);

2
gcc/ipa.c
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@ -685,6 +685,8 @@ varpool_externally_visible_p (struct varpool_node *vnode, bool aliased)
This is needed for i.e. references from asm statements. */
if (varpool_used_from_object_file_p (vnode))
return true;
if (vnode->resolution == LDPR_PREVAILING_DEF_IRONLY)
return false;
/* As a special case, the COMDAT virutal tables can be unshared.
In LTO mode turn vtables into static variables. The variable is readonly,

2
gcc/lto-cgraph.c
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@ -52,7 +52,7 @@ static void output_cgraph_opt_summary (cgraph_node_set set);
static void input_cgraph_opt_summary (VEC (cgraph_node_ptr, heap) * nodes);
/* Number of LDPR values known to GCC. */
#define LDPR_NUM_KNOWN (LDPR_RESOLVED_DYN + 1)
#define LDPR_NUM_KNOWN (LDPR_PREVAILING_DEF_IRONLY_EXP + 1)
/* Cgraph streaming is organized as set of record whose type
is indicated by a tag. */

16
gcc/lto-symtab.c
View File

@ -441,12 +441,14 @@ lto_symtab_resolve_symbols (void **slot)
e->node = cgraph_get_node (e->decl);
else if (TREE_CODE (e->decl) == VAR_DECL)
e->vnode = varpool_get_node (e->decl);
if (e->resolution == LDPR_PREVAILING_DEF_IRONLY
|| e->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
|| e->resolution == LDPR_PREVAILING_DEF)
prevailing = e;
}
e = (lto_symtab_entry_t) *slot;
/* If the chain is already resolved there is nothing else to do. */
if (e->resolution != LDPR_UNKNOWN)
if (prevailing)
return;
/* Find the single non-replaceable prevailing symbol and
@ -586,6 +588,7 @@ lto_symtab_merge_decls_1 (void **slot, void *data ATTRIBUTE_UNUSED)
for (prevailing = (lto_symtab_entry_t) *slot;
prevailing
&& prevailing->resolution != LDPR_PREVAILING_DEF_IRONLY
&& prevailing->resolution != LDPR_PREVAILING_DEF_IRONLY_EXP
&& prevailing->resolution != LDPR_PREVAILING_DEF;
prevailing = prevailing->next)
;
@ -595,6 +598,7 @@ lto_symtab_merge_decls_1 (void **slot, void *data ATTRIBUTE_UNUSED)
for (e = prevailing->next; e; e = e->next)
{
if (e->resolution == LDPR_PREVAILING_DEF_IRONLY
|| e->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
|| e->resolution == LDPR_PREVAILING_DEF)
fatal_error ("multiple prevailing defs for %qE",
DECL_NAME (prevailing->decl));
@ -685,9 +689,9 @@ lto_symtab_merge_decls_1 (void **slot, void *data ATTRIBUTE_UNUSED)
to handle UNKNOWN relocation well.
The problem with storing guessed decision is whether to use
PREVAILING_DEF or PREVAILING_DEF_IRONLY. First one would disable
some whole program optimizations, while ther second would imply
to many whole program assumptions. */
PREVAILING_DEF, PREVAILING_DEF_IRONLY, PREVAILING_DEF_IRONLY_EXP.
First one would disable some whole program optimizations, while
ther second would imply to many whole program assumptions. */
if (prevailing->node && !flag_ltrans && !prevailing->guessed)
prevailing->node->resolution = prevailing->resolution;
else if (prevailing->vnode && !flag_ltrans && !prevailing->guessed)

6
gcc/lto/ChangeLog
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@ -1,3 +1,9 @@
2011-10-02 Jan Hubicka <jh@suse.cz>
PR lto/47247
* common.c (lto_resolution_str): Add new resolution.
* common.h (lto_resolution_str): Likewise.
2011-09-30 H.J. Lu <hongjiu.lu@intel.com>
Andi Kleen <ak@linux.intel.com>

5
gcc/lto/common.c
View File

@ -31,7 +31,7 @@ const char *lto_visibility_str[4] __attribute__ ((visibility ("hidden"))) =
"INTERNAL", "HIDDEN"
};
const char *lto_resolution_str[9] __attribute__ ((visibility ("hidden"))) =
const char *lto_resolution_str[10] __attribute__ ((visibility ("hidden"))) =
{
"UNKNOWN",
"UNDEF",
@ -41,6 +41,7 @@ const char *lto_resolution_str[9] __attribute__ ((visibility ("hidden"))) =
"PREEMPTED_IR",
"RESOLVED_IR",
"RESOLVED_EXEC",
"RESOLVED_DYN"
"RESOLVED_DYN",
"PREVAILING_DEF_IRONLY_EXP",
};

5
gcc/lto/common.h
View File

@ -20,7 +20,7 @@ along with GCC; see the file COPYING3. If not see
static const char *lto_resolution_str[9] =
static const char *lto_resolution_str[10] =
{
"UNKNOWN",
"UNDEF",
@ -30,5 +30,6 @@ static const char *lto_resolution_str[9] =
"PREEMPTED_IR",
"RESOLVED_IR",
"RESOLVED_EXEC",
"RESOLVED_DYN"
"RESOLVED_DYN",
"PREVAILING_DEF_IRONLY_EXP",
};

2
gcc/varasm.c
View File

@ -6683,6 +6683,7 @@ static bool
resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
{
return (resolution == LDPR_PREVAILING_DEF
|| resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
|| resolution == LDPR_PREVAILING_DEF_IRONLY);
}
@ -6694,6 +6695,7 @@ resolution_local_p (enum ld_plugin_symbol_resolution resolution)
{
return (resolution == LDPR_PREVAILING_DEF
|| resolution == LDPR_PREVAILING_DEF_IRONLY
|| resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
|| resolution == LDPR_PREEMPTED_REG
|| resolution == LDPR_PREEMPTED_IR
|| resolution == LDPR_RESOLVED_IR

7
lto-plugin/ChangeLog
View File

@ -1,3 +1,10 @@
2011-10-02 Jan Hubicka <jh@suse.cz>
PR lto/47247
* lto-plugin.c (get_symbols_v2): New variable.
(write_resolution): Use V2 API when available.
(onload): Handle LDPT_GET_SYMBOLS_V2.
2011-09-30 H.J. Lu <hongjiu.lu@intel.com>
Andi Kleen <ak@linux.intel.com>

12
lto-plugin/lto-plugin.c
View File

@ -130,7 +130,7 @@ enum symbol_style
static char *arguments_file_name;
static ld_plugin_register_claim_file register_claim_file;
static ld_plugin_register_all_symbols_read register_all_symbols_read;
static ld_plugin_get_symbols get_symbols;
static ld_plugin_get_symbols get_symbols, get_symbols_v2;
static ld_plugin_register_cleanup register_cleanup;
static ld_plugin_add_input_file add_input_file;
static ld_plugin_add_input_library add_input_library;
@ -443,7 +443,12 @@ write_resolution (void)
struct plugin_symtab *symtab = &info->symtab;
struct ld_plugin_symbol *syms = symtab->syms;
get_symbols (info->handle, symtab->nsyms, syms);
/* Version 2 of API supports IRONLY_EXP resolution that is
accepted by GCC-4.7 and newer. */
if (get_symbols_v2)
get_symbols_v2 (info->handle, symtab->nsyms, syms);
else
get_symbols (info->handle, symtab->nsyms, syms);
finish_conflict_resolution (symtab, &info->conflicts);
@ -988,6 +993,9 @@ onload (struct ld_plugin_tv *tv)
case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
register_all_symbols_read = p->tv_u.tv_register_all_symbols_read;
break;
case LDPT_GET_SYMBOLS_V2:
get_symbols_v2 = p->tv_u.tv_get_symbols;
break;
case LDPT_GET_SYMBOLS:
get_symbols = p->tv_u.tv_get_symbols;
break;