1 /* Lower TLS operations to emulation functions.
2 Copyright (C) 2006-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
24 #include "stor-layout.h"
26 #include "basic-block.h"
27 #include "tree-ssa-alias.h"
28 #include "internal-fn.h"
29 #include "gimple-expr.h"
32 #include "gimple-iterator.h"
33 #include "gimple-walk.h"
34 #include "tree-pass.h"
35 #include "gimple-ssa.h"
37 #include "tree-phinodes.h"
38 #include "ssa-iterators.h"
39 #include "stringpool.h"
40 #include "tree-ssanames.h"
41 #include "langhooks.h"
43 #include "targhooks.h"
44 #include "tree-iterator.h"
47 /* Whenever a target does not support thread-local storage (TLS) natively,
48 we can emulate it with some run-time support in libgcc. This will in
49 turn rely on "keyed storage" a-la pthread_key_create; essentially all
50 thread libraries provide such functionality.
52 In order to coordinate with the libgcc runtime, each TLS variable is
53 described by a "control variable". This control variable records the
54 required size, alignment, and initial value of the TLS variable for
55 instantiation at runtime. It also stores an integer token to be used
56 by the runtime to find the address of the variable within each thread.
58 On the compiler side, this means that we need to replace all instances
59 of "tls_var" in the code with "*__emutls_get_addr(&control_var)". We
60 also need to eliminate "tls_var" from the symbol table and introduce
63 We used to perform all of the transformations during conversion to rtl,
64 and the variable substitutions magically within assemble_variable.
65 However, this late fiddling of the symbol table conflicts with LTO and
66 whole-program compilation. Therefore we must now make all the changes
67 to the symbol table early in the GIMPLE optimization path, before we
68 write things out to LTO intermediate files. */
70 /* These two vectors, once fully populated, are kept in lock-step so that
71 the index of a TLS variable equals the index of its control variable in
73 static varpool_node_set tls_vars
;
74 static vec
<varpool_node_ptr
> control_vars
;
76 /* For the current basic block, an SSA_NAME that has computed the address
77 of the TLS variable at the corresponding index. */
78 static vec
<tree
> access_vars
;
80 /* The type of the control structure, shared with the emutls.c runtime. */
81 static tree emutls_object_type
;
83 #if !defined (NO_DOT_IN_LABEL)
84 # define EMUTLS_SEPARATOR "."
85 #elif !defined (NO_DOLLAR_IN_LABEL)
86 # define EMUTLS_SEPARATOR "$"
88 # define EMUTLS_SEPARATOR "_"
91 /* Create an IDENTIFIER_NODE by prefixing PREFIX to the
92 IDENTIFIER_NODE NAME's name. */
95 prefix_name (const char *prefix
, tree name
)
97 unsigned plen
= strlen (prefix
);
98 unsigned nlen
= strlen (IDENTIFIER_POINTER (name
));
99 char *toname
= (char *) alloca (plen
+ nlen
+ 1);
101 memcpy (toname
, prefix
, plen
);
102 memcpy (toname
+ plen
, IDENTIFIER_POINTER (name
), nlen
+ 1);
104 return get_identifier (toname
);
107 /* Create an identifier for the struct __emutls_object, given an identifier
108 of the DECL_ASSEMBLY_NAME of the original object. */
111 get_emutls_object_name (tree name
)
113 const char *prefix
= (targetm
.emutls
.var_prefix
114 ? targetm
.emutls
.var_prefix
115 : "__emutls_v" EMUTLS_SEPARATOR
);
116 return prefix_name (prefix
, name
);
119 /* Create the fields of the type for the control variables. Ordinarily
120 this must match struct __emutls_object defined in emutls.c. However
121 this is a target hook so that VxWorks can define its own layout. */
124 default_emutls_var_fields (tree type
, tree
*name ATTRIBUTE_UNUSED
)
126 tree word_type_node
, field
, next_field
;
128 field
= build_decl (UNKNOWN_LOCATION
,
129 FIELD_DECL
, get_identifier ("__templ"), ptr_type_node
);
130 DECL_CONTEXT (field
) = type
;
133 field
= build_decl (UNKNOWN_LOCATION
,
134 FIELD_DECL
, get_identifier ("__offset"),
136 DECL_CONTEXT (field
) = type
;
137 DECL_CHAIN (field
) = next_field
;
140 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
141 field
= build_decl (UNKNOWN_LOCATION
,
142 FIELD_DECL
, get_identifier ("__align"),
144 DECL_CONTEXT (field
) = type
;
145 DECL_CHAIN (field
) = next_field
;
148 field
= build_decl (UNKNOWN_LOCATION
,
149 FIELD_DECL
, get_identifier ("__size"), word_type_node
);
150 DECL_CONTEXT (field
) = type
;
151 DECL_CHAIN (field
) = next_field
;
156 /* Initialize emulated tls object TO, which refers to TLS variable DECL and
157 is initialized by PROXY. As above, this is the default implementation of
158 a target hook overridden by VxWorks. */
161 default_emutls_var_init (tree to
, tree decl
, tree proxy
)
163 vec
<constructor_elt
, va_gc
> *v
;
166 tree type
= TREE_TYPE (to
);
167 tree field
= TYPE_FIELDS (type
);
170 elt
.value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
173 field
= DECL_CHAIN (field
);
175 elt
.value
= build_int_cst (TREE_TYPE (field
),
176 DECL_ALIGN_UNIT (decl
));
179 field
= DECL_CHAIN (field
);
181 elt
.value
= null_pointer_node
;
184 field
= DECL_CHAIN (field
);
189 return build_constructor (type
, v
);
192 /* Create the structure for struct __emutls_object. This should match the
193 structure at the top of emutls.c, modulo the union there. */
196 get_emutls_object_type (void)
198 tree type
, type_name
, field
;
200 type
= emutls_object_type
;
204 emutls_object_type
= type
= lang_hooks
.types
.make_type (RECORD_TYPE
);
206 field
= targetm
.emutls
.var_fields (type
, &type_name
);
208 type_name
= get_identifier ("__emutls_object");
209 type_name
= build_decl (UNKNOWN_LOCATION
,
210 TYPE_DECL
, type_name
, type
);
211 TYPE_NAME (type
) = type_name
;
212 TYPE_FIELDS (type
) = field
;
218 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
219 This will be used for initializing the emulated tls data area. */
222 get_emutls_init_templ_addr (tree decl
)
226 if (targetm
.emutls
.register_common
&& !DECL_INITIAL (decl
)
227 && !DECL_SECTION_NAME (decl
))
228 return null_pointer_node
;
230 name
= DECL_ASSEMBLER_NAME (decl
);
231 if (!targetm
.emutls
.tmpl_prefix
|| targetm
.emutls
.tmpl_prefix
[0])
233 const char *prefix
= (targetm
.emutls
.tmpl_prefix
234 ? targetm
.emutls
.tmpl_prefix
235 : "__emutls_t" EMUTLS_SEPARATOR
);
236 name
= prefix_name (prefix
, name
);
239 to
= build_decl (DECL_SOURCE_LOCATION (decl
),
240 VAR_DECL
, name
, TREE_TYPE (decl
));
241 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
243 DECL_ARTIFICIAL (to
) = 1;
244 TREE_USED (to
) = TREE_USED (decl
);
245 TREE_READONLY (to
) = 1;
246 DECL_IGNORED_P (to
) = 1;
247 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
248 DECL_PRESERVE_P (to
) = DECL_PRESERVE_P (decl
);
250 DECL_WEAK (to
) = DECL_WEAK (decl
);
251 if (DECL_ONE_ONLY (decl
))
253 make_decl_one_only (to
, DECL_ASSEMBLER_NAME (to
));
254 TREE_STATIC (to
) = TREE_STATIC (decl
);
255 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
256 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
259 TREE_STATIC (to
) = 1;
261 DECL_VISIBILITY_SPECIFIED (to
) = DECL_VISIBILITY_SPECIFIED (decl
);
262 DECL_INITIAL (to
) = DECL_INITIAL (decl
);
263 DECL_INITIAL (decl
) = NULL
;
265 if (targetm
.emutls
.tmpl_section
)
267 set_decl_section_name (to
, targetm
.emutls
.tmpl_section
);
270 set_decl_section_name (to
, DECL_SECTION_NAME (decl
));
272 /* Create varpool node for the new variable and finalize it if it is
274 if (DECL_EXTERNAL (to
))
275 varpool_node_for_decl (to
);
277 varpool_add_new_variable (to
);
278 return build_fold_addr_expr (to
);
281 /* Create and return the control variable for the TLS variable DECL. */
284 new_emutls_decl (tree decl
, tree alias_of
)
288 name
= DECL_ASSEMBLER_NAME (decl
);
289 to
= build_decl (DECL_SOURCE_LOCATION (decl
), VAR_DECL
,
290 get_emutls_object_name (name
),
291 get_emutls_object_type ());
293 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
295 DECL_TLS_MODEL (to
) = TLS_MODEL_EMULATED
;
296 DECL_ARTIFICIAL (to
) = 1;
297 DECL_IGNORED_P (to
) = 1;
298 TREE_READONLY (to
) = 0;
299 TREE_STATIC (to
) = 1;
301 DECL_PRESERVE_P (to
) = DECL_PRESERVE_P (decl
);
302 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
303 TREE_USED (to
) = TREE_USED (decl
);
304 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
305 DECL_EXTERNAL (to
) = DECL_EXTERNAL (decl
);
306 DECL_COMMON (to
) = DECL_COMMON (decl
);
307 DECL_WEAK (to
) = DECL_WEAK (decl
);
308 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
309 DECL_VISIBILITY_SPECIFIED (to
) = DECL_VISIBILITY_SPECIFIED (decl
);
310 DECL_DLLIMPORT_P (to
) = DECL_DLLIMPORT_P (decl
);
312 DECL_ATTRIBUTES (to
) = targetm
.merge_decl_attributes (decl
, to
);
314 if (DECL_ONE_ONLY (decl
))
315 make_decl_one_only (to
, DECL_ASSEMBLER_NAME (to
));
317 /* If we're not allowed to change the proxy object's alignment,
318 pretend it has been set by the user. */
319 if (targetm
.emutls
.var_align_fixed
)
320 DECL_USER_ALIGN (to
) = 1;
322 /* If the target wants the control variables grouped, do so. */
323 if (!DECL_COMMON (to
) && targetm
.emutls
.var_section
)
325 set_decl_section_name (to
, targetm
.emutls
.var_section
);
328 /* If this variable is defined locally, then we need to initialize the
329 control structure with size and alignment information. Initialization
330 of COMMON block variables happens elsewhere via a constructor. */
331 if (!DECL_EXTERNAL (to
)
332 && (!DECL_COMMON (to
)
333 || (DECL_INITIAL (decl
)
334 && DECL_INITIAL (decl
) != error_mark_node
)))
336 tree tmpl
= get_emutls_init_templ_addr (decl
);
337 DECL_INITIAL (to
) = targetm
.emutls
.var_init (to
, decl
, tmpl
);
338 record_references_in_initializer (to
, false);
341 /* Create varpool node for the new variable and finalize it if it is
343 if (DECL_EXTERNAL (to
))
344 varpool_node_for_decl (to
);
346 varpool_add_new_variable (to
);
348 varpool_create_variable_alias (to
,
350 (DECL_ASSEMBLER_NAME (DECL_VALUE_EXPR (alias_of
)))->decl
);
354 /* Look up the index of the TLS variable DECL. This index can then be
355 used in both the control_vars and access_vars arrays. */
358 emutls_index (tree decl
)
360 varpool_node_set_iterator i
;
362 i
= varpool_node_set_find (tls_vars
, varpool_get_node (decl
));
363 gcc_assert (i
.index
!= ~0u);
368 /* Look up the control variable for the TLS variable DECL. */
371 emutls_decl (tree decl
)
376 i
= emutls_index (decl
);
377 var
= control_vars
[i
];
381 /* Generate a call statement to initialize CONTROL_DECL for TLS_DECL.
382 This only needs to happen for TLS COMMON variables; non-COMMON
383 variables can be initialized statically. Insert the generated
384 call statement at the end of PSTMTS. */
387 emutls_common_1 (tree tls_decl
, tree control_decl
, tree
*pstmts
)
392 if (! DECL_COMMON (tls_decl
)
393 || (DECL_INITIAL (tls_decl
)
394 && DECL_INITIAL (tls_decl
) != error_mark_node
))
397 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
399 x
= build_call_expr (builtin_decl_explicit (BUILT_IN_EMUTLS_REGISTER_COMMON
),
400 4, build_fold_addr_expr (control_decl
),
401 fold_convert (word_type_node
,
402 DECL_SIZE_UNIT (tls_decl
)),
403 build_int_cst (word_type_node
,
404 DECL_ALIGN_UNIT (tls_decl
)),
405 get_emutls_init_templ_addr (tls_decl
));
407 append_to_statement_list (x
, pstmts
);
410 struct lower_emutls_data
412 struct cgraph_node
*cfun_node
;
413 struct cgraph_node
*builtin_node
;
421 /* Given a TLS variable DECL, return an SSA_NAME holding its address.
422 Append any new computation statements required to D->SEQ. */
425 gen_emutls_addr (tree decl
, struct lower_emutls_data
*d
)
430 /* Compute the address of the TLS variable with help from runtime. */
431 index
= emutls_index (decl
);
432 addr
= access_vars
[index
];
439 cvar
= control_vars
[index
];
441 TREE_ADDRESSABLE (cdecl) = 1;
443 addr
= create_tmp_var (build_pointer_type (TREE_TYPE (decl
)), NULL
);
444 x
= gimple_build_call (d
->builtin_decl
, 1, build_fold_addr_expr (cdecl));
445 gimple_set_location (x
, d
->loc
);
447 addr
= make_ssa_name (addr
, x
);
448 gimple_call_set_lhs (x
, addr
);
450 gimple_seq_add_stmt (&d
->seq
, x
);
452 cgraph_create_edge (d
->cfun_node
, d
->builtin_node
, x
,
453 d
->bb
->count
, d
->bb_freq
);
455 /* We may be adding a new reference to a new variable to the function.
456 This means we have to play with the ipa-reference web. */
457 ipa_record_reference (d
->cfun_node
, cvar
, IPA_REF_ADDR
, x
);
459 /* Record this ssa_name for possible use later in the basic block. */
460 access_vars
[index
] = addr
;
466 /* Callback for walk_gimple_op. D = WI->INFO is a struct lower_emutls_data.
467 Given an operand *PTR within D->STMT, if the operand references a TLS
468 variable, then lower the reference to a call to the runtime. Insert
469 any new statements required into D->SEQ; the caller is responsible for
470 placing those appropriately. */
473 lower_emutls_1 (tree
*ptr
, int *walk_subtrees
, void *cb_data
)
475 struct walk_stmt_info
*wi
= (struct walk_stmt_info
*) cb_data
;
476 struct lower_emutls_data
*d
= (struct lower_emutls_data
*) wi
->info
;
478 bool is_addr
= false;
483 switch (TREE_CODE (t
))
486 /* If this is not a straight-forward "&var", but rather something
487 like "&var.a", then we may need special handling. */
488 if (TREE_CODE (TREE_OPERAND (t
, 0)) != VAR_DECL
)
492 /* If we're allowed more than just is_gimple_val, continue. */
499 /* See if any substitution would be made. */
500 save_changed
= wi
->changed
;
502 wi
->val_only
= false;
503 walk_tree (&TREE_OPERAND (t
, 0), lower_emutls_1
, wi
, NULL
);
506 /* If so, then extract this entire sub-expression "&p->a" into a
507 new assignment statement, and substitute yet another SSA_NAME. */
512 addr
= create_tmp_var (TREE_TYPE (t
), NULL
);
513 x
= gimple_build_assign (addr
, t
);
514 gimple_set_location (x
, d
->loc
);
516 addr
= make_ssa_name (addr
, x
);
517 gimple_assign_set_lhs (x
, addr
);
519 gimple_seq_add_stmt (&d
->seq
, x
);
524 wi
->changed
= save_changed
;
529 t
= TREE_OPERAND (t
, 0);
534 if (!DECL_THREAD_LOCAL_P (t
))
539 /* We're not interested in other decls or types, only subexpressions. */
545 /* Special-case the return of SSA_NAME, since it's so common. */
549 addr
= gen_emutls_addr (t
, d
);
552 /* Replace "&var" with "addr" in the statement. */
557 /* Replace "var" with "*addr" in the statement. */
558 t
= build2 (MEM_REF
, TREE_TYPE (t
), addr
,
559 build_int_cst (TREE_TYPE (addr
), 0));
567 /* Lower all of the operands of STMT. */
570 lower_emutls_stmt (gimple stmt
, struct lower_emutls_data
*d
)
572 struct walk_stmt_info wi
;
574 d
->loc
= gimple_location (stmt
);
576 memset (&wi
, 0, sizeof (wi
));
579 walk_gimple_op (stmt
, lower_emutls_1
, &wi
);
585 /* Lower the I'th operand of PHI. */
588 lower_emutls_phi_arg (gimple phi
, unsigned int i
, struct lower_emutls_data
*d
)
590 struct walk_stmt_info wi
;
591 struct phi_arg_d
*pd
= gimple_phi_arg (phi
, i
);
593 /* Early out for a very common case we don't care about. */
594 if (TREE_CODE (pd
->def
) == SSA_NAME
)
599 memset (&wi
, 0, sizeof (wi
));
602 walk_tree (&pd
->def
, lower_emutls_1
, &wi
, NULL
);
604 /* For normal statements, we let update_stmt do its job. But for phi
605 nodes, we have to manipulate the immediate use list by hand. */
608 gcc_assert (TREE_CODE (pd
->def
) == SSA_NAME
);
609 link_imm_use_stmt (&pd
->imm_use
, pd
->def
, phi
);
613 /* Clear the ACCESS_VARS array, in order to begin a new block. */
616 clear_access_vars (void)
618 memset (access_vars
.address (), 0,
619 access_vars
.length () * sizeof (tree
));
622 /* Lower the entire function NODE. */
625 lower_emutls_function_body (struct cgraph_node
*node
)
627 struct lower_emutls_data d
;
628 bool any_edge_inserts
= false;
630 push_cfun (DECL_STRUCT_FUNCTION (node
->decl
));
633 d
.builtin_decl
= builtin_decl_explicit (BUILT_IN_EMUTLS_GET_ADDRESS
);
634 /* This is where we introduce the declaration to the IL and so we have to
635 create a node for it. */
636 d
.builtin_node
= cgraph_get_create_node (d
.builtin_decl
);
638 FOR_EACH_BB_FN (d
.bb
, cfun
)
640 gimple_stmt_iterator gsi
;
641 unsigned int i
, nedge
;
643 /* Lower each of the PHI nodes of the block, as we may have
644 propagated &tlsvar into a PHI argument. These loops are
645 arranged so that we process each edge at once, and each
646 PHI argument for that edge. */
647 if (!gimple_seq_empty_p (phi_nodes (d
.bb
)))
649 /* The calls will be inserted on the edges, and the frequencies
650 will be computed during the commit process. */
653 nedge
= EDGE_COUNT (d
.bb
->preds
);
654 for (i
= 0; i
< nedge
; ++i
)
656 edge e
= EDGE_PRED (d
.bb
, i
);
658 /* We can re-use any SSA_NAME created on this edge. */
659 clear_access_vars ();
662 for (gsi
= gsi_start_phis (d
.bb
);
665 lower_emutls_phi_arg (gsi_stmt (gsi
), i
, &d
);
667 /* Insert all statements generated by all phi nodes for this
668 particular edge all at once. */
671 gsi_insert_seq_on_edge (e
, d
.seq
);
672 any_edge_inserts
= true;
677 d
.bb_freq
= compute_call_stmt_bb_frequency (current_function_decl
, d
.bb
);
679 /* We can re-use any SSA_NAME created during this basic block. */
680 clear_access_vars ();
682 /* Lower each of the statements of the block. */
683 for (gsi
= gsi_start_bb (d
.bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
686 lower_emutls_stmt (gsi_stmt (gsi
), &d
);
688 /* If any new statements were created, insert them immediately
689 before the first use. This prevents variable lifetimes from
690 becoming unnecessarily long. */
692 gsi_insert_seq_before (&gsi
, d
.seq
, GSI_SAME_STMT
);
696 if (any_edge_inserts
)
697 gsi_commit_edge_inserts ();
702 /* Create emutls variable for VAR, DATA is pointer to static
703 ctor body we can add constructors to.
704 Callback for varpool_for_variable_and_aliases. */
707 create_emultls_var (varpool_node
*var
, void *data
)
712 cdecl = new_emutls_decl (var
->decl
,
713 var
->alias
&& var
->analyzed
714 ? varpool_alias_target (var
)->decl
: NULL
);
716 cvar
= varpool_get_node (cdecl);
717 control_vars
.quick_push (cvar
);
721 /* Make sure the COMMON block control variable gets initialized.
722 Note that there's no point in doing this for aliases; we only
723 need to do this once for the main variable. */
724 emutls_common_1 (var
->decl
, cdecl, (tree
*)data
);
726 if (var
->alias
&& !var
->analyzed
)
729 /* Indicate that the value of the TLS variable may be found elsewhere,
730 preventing the variable from re-appearing in the GIMPLE. We cheat
731 and use the control variable here (rather than a full call_expr),
732 which is special-cased inside the DWARF2 output routines. */
733 SET_DECL_VALUE_EXPR (var
->decl
, cdecl);
734 DECL_HAS_VALUE_EXPR_P (var
->decl
) = 1;
738 /* Main entry point to the tls lowering pass. */
741 ipa_lower_emutls (void)
744 struct cgraph_node
*func
;
745 bool any_aliases
= false;
746 tree ctor_body
= NULL
;
747 unsigned int i
, n_tls
;
749 tls_vars
= varpool_node_set_new ();
751 /* Examine all global variables for TLS variables. */
752 FOR_EACH_VARIABLE (var
)
753 if (DECL_THREAD_LOCAL_P (var
->decl
))
755 gcc_checking_assert (TREE_STATIC (var
->decl
)
756 || DECL_EXTERNAL (var
->decl
));
757 varpool_node_set_add (tls_vars
, var
);
758 if (var
->alias
&& var
->definition
)
759 varpool_node_set_add (tls_vars
, varpool_variable_node (var
, NULL
));
762 /* If we found no TLS variables, then there is no further work to do. */
763 if (!tls_vars
->nodes
.exists ())
767 fprintf (dump_file
, "No TLS variables found.\n");
771 /* Allocate the on-the-side arrays that share indicies with the TLS vars. */
772 n_tls
= tls_vars
->nodes
.length ();
773 control_vars
.create (n_tls
);
774 access_vars
.create (n_tls
);
775 access_vars
.safe_grow_cleared (n_tls
);
777 /* Create the control variables for each TLS variable. */
778 FOR_EACH_VEC_ELT (tls_vars
->nodes
, i
, var
)
780 var
= tls_vars
->nodes
[i
];
782 if (var
->alias
&& !var
->analyzed
)
784 else if (!var
->alias
)
785 varpool_for_node_and_aliases (var
, create_emultls_var
, &ctor_body
, true);
788 /* If there were any aliases, then frob the alias_pairs vector. */
792 FOR_EACH_VEC_SAFE_ELT (alias_pairs
, i
, p
)
793 if (DECL_THREAD_LOCAL_P (p
->decl
))
795 p
->decl
= emutls_decl (p
->decl
);
796 p
->target
= get_emutls_object_name (p
->target
);
800 /* Adjust all uses of TLS variables within the function bodies. */
801 FOR_EACH_DEFINED_FUNCTION (func
)
803 lower_emutls_function_body (func
);
805 /* Generate the constructor for any COMMON control variables created. */
807 cgraph_build_static_cdtor ('I', ctor_body
, DEFAULT_INIT_PRIORITY
);
809 control_vars
.release ();
810 access_vars
.release ();
811 free_varpool_node_set (tls_vars
);
818 const pass_data pass_data_ipa_lower_emutls
=
820 SIMPLE_IPA_PASS
, /* type */
822 OPTGROUP_NONE
, /* optinfo_flags */
823 true, /* has_execute */
824 TV_IPA_OPT
, /* tv_id */
825 ( PROP_cfg
| PROP_ssa
), /* properties_required */
826 0, /* properties_provided */
827 0, /* properties_destroyed */
828 0, /* todo_flags_start */
829 0, /* todo_flags_finish */
832 class pass_ipa_lower_emutls
: public simple_ipa_opt_pass
835 pass_ipa_lower_emutls (gcc::context
*ctxt
)
836 : simple_ipa_opt_pass (pass_data_ipa_lower_emutls
, ctxt
)
839 /* opt_pass methods: */
840 virtual bool gate (function
*)
842 /* If the target supports TLS natively, we need do nothing here. */
843 return !targetm
.have_tls
;
846 virtual unsigned int execute (function
*) { return ipa_lower_emutls (); }
848 }; // class pass_ipa_lower_emutls
852 simple_ipa_opt_pass
*
853 make_pass_ipa_lower_emutls (gcc::context
*ctxt
)
855 return new pass_ipa_lower_emutls (ctxt
);