/* Top-level control of tree optimizations.
- Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "tree-inline.h"
#include "tree-mudflap.h"
#include "tree-pass.h"
-#include "tree-alias-common.h"
#include "ggc.h"
#include "cgraph.h"
+#include "graph.h"
+#include "cfgloop.h"
+#include "except.h"
-/* Global variables used to communicate with passes. */
-int dump_flags;
-bitmap vars_to_rename;
-bool in_gimple_form;
+/* Gate: execute, or not, all of the non-trivial optimizations. */
-/* The root of the compilation pass tree, once constructed. */
-static struct tree_opt_pass *all_passes;
+static bool
+gate_all_optimizations (void)
+{
+ return (optimize >= 1
+ /* Don't bother doing anything if the program has errors. */
+ && !(errorcount || sorrycount));
+}
-/* Pass: dump the gimplified, inlined, functions. */
+struct tree_opt_pass pass_all_optimizations =
+{
+ NULL, /* name */
+ gate_all_optimizations, /* gate */
+ NULL, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
+};
-static struct tree_opt_pass pass_gimple =
+struct tree_opt_pass pass_early_local_passes =
{
- "gimple", /* name */
- NULL, /* gate */
+ NULL, /* name */
+ gate_all_optimizations, /* gate */
NULL, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
0, /* tv_id */
0, /* properties_required */
- PROP_gimple_any, /* properties_provided */
+ 0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_func /* todo_flags_finish */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
};
-/* Gate: execute, or not, all of the non-trivial optimizations. */
+/* Pass: cleanup the CFG just before expanding trees to RTL.
+ This is just a round of label cleanups and case node grouping
+ because after the tree optimizers have run such cleanups may
+ be necessary. */
-static bool
-gate_all_optimizations (void)
+static void
+execute_cleanup_cfg_pre_ipa (void)
{
- return (optimize >= 1
- /* Don't bother doing anything if the program has errors. */
- && !(errorcount || sorrycount));
+ cleanup_tree_cfg ();
}
-static struct tree_opt_pass pass_all_optimizations =
+struct tree_opt_pass pass_cleanup_cfg =
{
- NULL, /* name */
- gate_all_optimizations, /* gate */
- NULL, /* execute */
+ "cleanup_cfg", /* name */
+ NULL, /* gate */
+ execute_cleanup_cfg_pre_ipa, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
0, /* tv_id */
- 0, /* properties_required */
+ PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0 /* todo_flags_finish */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
};
+
/* Pass: cleanup the CFG just before expanding trees to RTL.
This is just a round of label cleanups and case node grouping
because after the tree optimizers have run such cleanups may
static void
execute_cleanup_cfg_post_optimizing (void)
{
+ fold_cond_expr_cond ();
cleanup_tree_cfg ();
cleanup_dead_labels ();
group_case_labels ();
}
-static struct tree_opt_pass pass_cleanup_cfg_post_optimizing =
+struct tree_opt_pass pass_cleanup_cfg_post_optimizing =
{
- NULL, /* name */
+ "final_cleanup", /* name */
NULL, /* gate */
execute_cleanup_cfg_post_optimizing, /* execute */
NULL, /* sub */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0 /* todo_flags_finish */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
};
/* Pass: do the actions required to finish with tree-ssa optimization
static void
execute_free_datastructures (void)
{
- tree *chain;
-
/* ??? This isn't the right place for this. Worse, it got computed
more or less at random in various passes. */
free_dominance_info (CDI_DOMINATORS);
-
- /* Emit gotos for implicit jumps. */
- disband_implicit_edges ();
+ free_dominance_info (CDI_POST_DOMINATORS);
/* Remove the ssa structures. Do it here since this includes statement
annotations that need to be intact during disband_implicit_edges. */
delete_tree_ssa ();
-
- /* Re-chain the statements from the blocks. */
- chain = &DECL_SAVED_TREE (current_function_decl);
- *chain = alloc_stmt_list ();
-
- /* And get rid of annotations we no longer need. */
- delete_tree_cfg_annotations ();
}
-static struct tree_opt_pass pass_free_datastructures =
+struct tree_opt_pass pass_free_datastructures =
{
NULL, /* name */
NULL, /* gate */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0 /* todo_flags_finish */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
};
-
-
-/* Do the actions required to initialize internal data structures used
- in tree-ssa optimization passes. */
+/* Pass: free cfg annotations. */
static void
-execute_init_datastructures (void)
+execute_free_cfg_annotations (void)
{
- /* Allocate hash tables, arrays and other structures. */
- init_tree_ssa ();
+ basic_block bb;
+ block_stmt_iterator bsi;
+
+ /* Emit gotos for implicit jumps. */
+ disband_implicit_edges ();
+
+ /* Remove annotations from every tree in the function. */
+ FOR_EACH_BB (bb)
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ ggc_free (stmt->common.ann);
+ stmt->common.ann = NULL;
+ }
+
+ /* And get rid of annotations we no longer need. */
+ delete_tree_cfg_annotations ();
+
+#ifdef ENABLE_CHECKING
+ /* Once the statement annotations have been removed, we can verify
+ the integrity of statements in the EH throw table. */
+ verify_eh_throw_table_statements ();
+#endif
}
-static struct tree_opt_pass pass_init_datastructures =
+struct tree_opt_pass pass_free_cfg_annotations =
{
NULL, /* name */
NULL, /* gate */
- execute_init_datastructures, /* execute */
+ execute_free_cfg_annotations, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0 /* todo_flags_finish */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
};
-
-/* Iterate over the pass tree allocating dump file numbers. We want
- to do this depth first, and independent of whether the pass is
- enabled or not. */
+/* Pass: fixup_cfg - IPA passes or compilation of earlier functions might've
+ changed some properties - such as marked functions nothrow. Remove now
+ redundant edges and basic blocks. */
static void
-register_one_dump_file (struct tree_opt_pass *pass)
+execute_fixup_cfg (void)
{
- char *dot_name, *flag_name;
- char num[10];
-
- if (!pass->name)
- return;
-
- /* See below in next_pass_1. */
- num[0] = '\0';
- if (pass->static_pass_number != -1)
- sprintf (num, "%d", ((int) pass->static_pass_number < 0
- ? 1 : pass->static_pass_number));
-
- dot_name = concat (".", pass->name, num, NULL);
- flag_name = concat ("tree-", pass->name, num, NULL);
-
- pass->static_pass_number = dump_register (dot_name, flag_name);
+ basic_block bb;
+ block_stmt_iterator bsi;
+
+ if (cfun->eh)
+ FOR_EACH_BB (bb)
+ {
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ tree call = get_call_expr_in (stmt);
+
+ if (call && call_expr_flags (call) & (ECF_CONST | ECF_PURE))
+ TREE_SIDE_EFFECTS (call) = 0;
+ if (!tree_could_throw_p (stmt) && lookup_stmt_eh_region (stmt))
+ remove_stmt_from_eh_region (stmt);
+ }
+ tree_purge_dead_eh_edges (bb);
+ }
+
+ cleanup_tree_cfg ();
}
-static int
-register_dump_files (struct tree_opt_pass *pass, int properties)
+struct tree_opt_pass pass_fixup_cfg =
{
- do
- {
- /* Verify that all required properties are present. */
- if (pass->properties_required & ~properties)
- abort ();
-
- if (pass->properties_destroyed & pass->properties_provided)
- abort ();
-
- pass->properties_required = properties;
- pass->properties_provided = properties =
- (properties | pass->properties_provided) & ~pass->properties_destroyed;
-
- if (properties & PROP_trees)
- register_one_dump_file (pass);
- if (pass->sub)
- properties = register_dump_files (pass->sub, properties);
- pass = pass->next;
- }
- while (pass);
-
- return properties;
-}
+ "fixupcfg", /* name */
+ NULL, /* gate */
+ execute_fixup_cfg, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ PROP_cfg, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
+};
-/* Add a pass to the pass list. Duplicate the pass if it's already
- in the list. */
+/* Do the actions required to initialize internal data structures used
+ in tree-ssa optimization passes. */
-static struct tree_opt_pass **
-next_pass_1 (struct tree_opt_pass **list, struct tree_opt_pass *pass)
+static void
+execute_init_datastructures (void)
{
-
- /* A non-zero static_pass_number indicates that the
- pass is already in the list. */
- if (pass->static_pass_number)
- {
- struct tree_opt_pass *new;
-
- new = xmalloc (sizeof (*new));
- memcpy (new, pass, sizeof (*new));
-
- /* Indicate to register_dump_files that this pass has duplicates,
- and so it should rename the dump file. The first instance will
- be -1, and be number of duplicates = -static_pass_number - 1.
- Subsequent instances will be > 0 and just the duplicate number. */
- if (pass->name)
- {
- pass->static_pass_number -= 1;
- new->static_pass_number = -pass->static_pass_number;
- }
-
- *list = new;
- }
- else
- {
- pass->static_pass_number = -1;
- *list = pass;
- }
-
- return &(*list)->next;
-
+ /* Allocate hash tables, arrays and other structures. */
+ init_tree_ssa ();
}
-/* Construct the pass tree. */
+struct tree_opt_pass pass_init_datastructures =
+{
+ NULL, /* name */
+ NULL, /* gate */
+ execute_init_datastructures, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ 0, /* tv_id */
+ PROP_cfg, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
+};
void
-init_tree_optimization_passes (void)
+tree_lowering_passes (tree fn)
{
- struct tree_opt_pass **p;
-
-#define NEXT_PASS(PASS) (p = next_pass_1 (p, &PASS))
-
- p = &all_passes;
- NEXT_PASS (pass_gimple);
- NEXT_PASS (pass_remove_useless_stmts);
- NEXT_PASS (pass_mudflap_1);
- NEXT_PASS (pass_lower_cf);
- NEXT_PASS (pass_lower_eh);
- NEXT_PASS (pass_build_cfg);
- NEXT_PASS (pass_pre_expand);
- NEXT_PASS (pass_tree_profile);
- NEXT_PASS (pass_init_datastructures);
- NEXT_PASS (pass_all_optimizations);
- NEXT_PASS (pass_warn_function_return);
- NEXT_PASS (pass_mudflap_2);
- NEXT_PASS (pass_free_datastructures);
- NEXT_PASS (pass_expand);
- NEXT_PASS (pass_rest_of_compilation);
- *p = NULL;
-
- p = &pass_all_optimizations.sub;
- NEXT_PASS (pass_referenced_vars);
- NEXT_PASS (pass_build_pta);
- NEXT_PASS (pass_build_ssa);
- NEXT_PASS (pass_may_alias);
- NEXT_PASS (pass_rename_ssa_copies);
- NEXT_PASS (pass_early_warn_uninitialized);
- NEXT_PASS (pass_dce);
- NEXT_PASS (pass_dominator);
- NEXT_PASS (pass_redundant_phi);
- NEXT_PASS (pass_dce);
- NEXT_PASS (pass_forwprop);
- NEXT_PASS (pass_phiopt);
- NEXT_PASS (pass_may_alias);
- NEXT_PASS (pass_tail_recursion);
- NEXT_PASS (pass_ch);
- NEXT_PASS (pass_profile);
- NEXT_PASS (pass_sra);
- NEXT_PASS (pass_rename_ssa_copies);
- NEXT_PASS (pass_dominator);
- NEXT_PASS (pass_redundant_phi);
- NEXT_PASS (pass_dce);
- NEXT_PASS (pass_dse);
- NEXT_PASS (pass_may_alias);
- NEXT_PASS (pass_forwprop);
- NEXT_PASS (pass_phiopt);
- NEXT_PASS (pass_ccp);
- NEXT_PASS (pass_redundant_phi);
- NEXT_PASS (pass_fold_builtins);
- NEXT_PASS (pass_split_crit_edges);
- NEXT_PASS (pass_pre);
- NEXT_PASS (pass_loop);
- NEXT_PASS (pass_dominator);
- NEXT_PASS (pass_redundant_phi);
- NEXT_PASS (pass_cd_dce);
- NEXT_PASS (pass_dse);
- NEXT_PASS (pass_forwprop);
- NEXT_PASS (pass_phiopt);
- NEXT_PASS (pass_tail_calls);
- NEXT_PASS (pass_late_warn_uninitialized);
- NEXT_PASS (pass_del_pta);
- NEXT_PASS (pass_del_ssa);
- NEXT_PASS (pass_nrv);
- NEXT_PASS (pass_remove_useless_vars);
- NEXT_PASS (pass_cleanup_cfg_post_optimizing);
- *p = NULL;
-
- p = &pass_loop.sub;
- NEXT_PASS (pass_loop_init);
- NEXT_PASS (pass_lim);
- NEXT_PASS (pass_iv_canon);
- NEXT_PASS (pass_vectorize);
- NEXT_PASS (pass_complete_unroll);
- NEXT_PASS (pass_loop_done);
- *p = NULL;
-
-#undef NEXT_PASS
-
- /* Register the passes with the tree dump code. */
- register_dump_files (all_passes, 0);
+ tree saved_current_function_decl = current_function_decl;
+
+ current_function_decl = fn;
+ push_cfun (DECL_STRUCT_FUNCTION (fn));
+ tree_register_cfg_hooks ();
+ bitmap_obstack_initialize (NULL);
+ execute_pass_list (all_lowering_passes);
+ free_dominance_info (CDI_POST_DOMINATORS);
+ compact_blocks ();
+ current_function_decl = saved_current_function_decl;
+ bitmap_obstack_release (NULL);
+ pop_cfun ();
}
-static void execute_pass_list (struct tree_opt_pass *);
-
-static unsigned int last_verified;
-
+/* Update recursively all inlined_to pointers of functions
+ inlined into NODE to INLINED_TO. */
static void
-execute_todo (unsigned int flags)
+update_inlined_to_pointers (struct cgraph_node *node,
+ struct cgraph_node *inlined_to)
{
- if (flags & TODO_rename_vars)
- {
- rewrite_into_ssa (false);
- bitmap_clear (vars_to_rename);
- }
-
- if ((flags & TODO_dump_func) && dump_file)
+ struct cgraph_edge *e;
+ for (e = node->callees; e; e = e->next_callee)
{
- dump_function_to_file (current_function_decl,
- dump_file, dump_flags);
-
- /* Flush the file. If verification fails, we won't be able to
- close the file before aborting. */
- fflush (dump_file);
- }
-
- if (flags & TODO_ggc_collect)
- ggc_collect ();
-
-#ifdef ENABLE_CHECKING
- if (flags & TODO_verify_ssa)
- verify_ssa ();
- if (flags & TODO_verify_flow)
- verify_flow_info ();
- if (flags & TODO_verify_stmts)
- verify_stmts ();
-#endif
-}
-
-static bool
-execute_one_pass (struct tree_opt_pass *pass)
-{
- unsigned int todo;
-
- /* See if we're supposed to run this pass. */
- if (pass->gate && !pass->gate ())
- return false;
-
- /* Note that the folders should only create gimple expressions.
- This is a hack until the new folder is ready. */
- in_gimple_form = (pass->properties_provided & PROP_trees) != 0;
-
- /* Run pre-pass verification. */
- todo = pass->todo_flags_start & ~last_verified;
- if (todo)
- execute_todo (todo);
-
- /* If a dump file name is present, open it if enabled. */
- if (pass->static_pass_number != -1)
- {
- dump_file = dump_begin (pass->static_pass_number, &dump_flags);
- if (dump_file)
+ if (e->callee->global.inlined_to)
{
- const char *dname, *aname;
- dname = lang_hooks.decl_printable_name (current_function_decl, 2);
- aname = (IDENTIFIER_POINTER
- (DECL_ASSEMBLER_NAME (current_function_decl)));
- fprintf (dump_file, "\n;; Function %s (%s)\n\n", dname, aname);
+ e->callee->global.inlined_to = inlined_to;
+ update_inlined_to_pointers (e->callee, inlined_to);
}
}
-
- /* If a timevar is present, start it. */
- if (pass->tv_id)
- timevar_push (pass->tv_id);
-
- /* Do it! */
- if (pass->execute)
- pass->execute ();
-
- /* Run post-pass cleanup and verification. */
- todo = pass->todo_flags_finish;
- last_verified = todo & TODO_verify_all;
- if (todo)
- execute_todo (todo);
-
- /* Close down timevar and dump file. */
- if (pass->tv_id)
- timevar_pop (pass->tv_id);
- if (dump_file)
- {
- dump_end (pass->static_pass_number, dump_file);
- dump_file = NULL;
- }
-
- return true;
-}
-
-static void
-execute_pass_list (struct tree_opt_pass *pass)
-{
- do
- {
- if (execute_one_pass (pass) && pass->sub)
- execute_pass_list (pass->sub);
- pass = pass->next;
- }
- while (pass);
}
\f
compilation for FNDECL. */
void
-tree_rest_of_compilation (tree fndecl, bool nested_p)
+tree_rest_of_compilation (tree fndecl)
{
location_t saved_loc;
- struct cgraph_node *saved_node = NULL, *node;
+ struct cgraph_node *node;
timevar_push (TV_EXPAND);
- if (flag_unit_at_a_time && !cgraph_global_info_ready)
- abort ();
+ gcc_assert (!flag_unit_at_a_time || cgraph_global_info_ready);
+
+ node = cgraph_node (fndecl);
+
+ /* We might need the body of this function so that we can expand
+ it inline somewhere else. */
+ if (cgraph_preserve_function_body_p (fndecl))
+ save_inline_function_body (node);
/* Initialize the RTL code for the function. */
current_function_decl = fndecl;
We haven't necessarily assigned RTL to all variables yet, so it's
not safe to try to expand expressions involving them. */
cfun->x_dont_save_pending_sizes_p = 1;
-
- node = cgraph_node (fndecl);
-
- /* We might need the body of this function so that we can expand
- it inline somewhere else. This means not lowering some constructs
- such as exception handling. */
- if (cgraph_preserve_function_body_p (fndecl))
- {
- if (!flag_unit_at_a_time)
- {
- struct cgraph_edge *e;
-
- saved_node = cgraph_clone_node (node);
- for (e = saved_node->callees; e; e = e->next_callee)
- if (!e->inline_failed)
- cgraph_clone_inlined_nodes (e, true);
- }
- cfun->saved_static_chain_decl = cfun->static_chain_decl;
- cfun->saved_tree = save_body (fndecl, &cfun->saved_args,
- &cfun->saved_static_chain_decl);
- }
+ cfun->after_inlining = true;
if (flag_inline_trees)
{
timevar_pop (TV_INTEGRATION);
}
}
+ /* We are not going to maintain the cgraph edges up to date.
+ Kill it so it won't confuse us. */
+ while (node->callees)
+ {
+ /* In non-unit-at-a-time we must mark all referenced functions as needed.
+ */
+ if (node->callees->callee->analyzed && !flag_unit_at_a_time)
+ cgraph_mark_needed_node (node->callees->callee);
+ cgraph_remove_edge (node->callees);
+ }
- if (!vars_to_rename)
- vars_to_rename = BITMAP_XMALLOC ();
+ /* We are not going to maintain the cgraph edges up to date.
+ Kill it so it won't confuse us. */
+ cgraph_node_remove_callees (node);
- /* If this is a nested function, protect the local variables in the stack
- above us from being collected while we're compiling this function. */
- if (nested_p)
- ggc_push_context ();
+ /* Initialize the default bitmap obstack. */
+ bitmap_obstack_initialize (NULL);
+ bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL generation*/
+
+ tree_register_cfg_hooks ();
/* Perform all tree transforms and optimizations. */
execute_pass_list (all_passes);
+
+ bitmap_obstack_release (®_obstack);
- /* Restore original body if still needed. */
- if (cfun->saved_tree)
- {
- DECL_SAVED_TREE (fndecl) = cfun->saved_tree;
- DECL_ARGUMENTS (fndecl) = cfun->saved_args;
- cfun->static_chain_decl = cfun->saved_static_chain_decl;
-
- /* When not in unit-at-a-time mode, we must preserve out of line copy
- representing node before inlining. Restore original outgoing edges
- using clone we created earlier. */
- if (!flag_unit_at_a_time)
- {
- struct cgraph_edge *e;
- while (node->callees)
- cgraph_remove_edge (node->callees);
- node->callees = saved_node->callees;
- saved_node->callees = NULL;
- for (e = saved_node->callees; e; e = e->next_callee)
- e->caller = node;
- cgraph_remove_node (saved_node);
- }
- }
- else
- DECL_SAVED_TREE (fndecl) = NULL;
+ /* Release the default bitmap obstack. */
+ bitmap_obstack_release (NULL);
+
+ DECL_SAVED_TREE (fndecl) = NULL;
cfun = 0;
/* If requested, warn about function definitions where the function will
= TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
- warning ("%Jsize of return value of '%D' is %u bytes",
- fndecl, fndecl, size_as_int);
+ warning (0, "size of return value of %q+D is %u bytes",
+ fndecl, size_as_int);
else
- warning ("%Jsize of return value of '%D' is larger than %wd bytes",
- fndecl, fndecl, larger_than_size);
+ warning (0, "size of return value of %q+D is larger than %wd bytes",
+ fndecl, larger_than_size);
}
}
- if (!nested_p && !flag_inline_trees)
+ if (!flag_inline_trees)
{
DECL_SAVED_TREE (fndecl) = NULL;
if (DECL_STRUCT_FUNCTION (fndecl) == 0
input_location = saved_loc;
ggc_collect ();
-
- /* Undo the GC context switch. */
- if (nested_p)
- ggc_pop_context ();
timevar_pop (TV_EXPAND);
}
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