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497e80a371
freebsd-skq/gcc/passes.c
Peter Wemm 497e80a371 Reorganize the gcc vendor import work area. This flattens out a bunch 
of unnecessary path components that are relics of cvs2svn.

(These are directory moves)
2008-06-01 00:03:21 +00:00

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/* Top level of GCC compilers (cc1, cc1plus, etc.)
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
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, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
/* This is the top level of cc1/c++.
It parses command args, opens files, invokes the various passes
in the proper order, and counts the time used by each.
Error messages and low-level interface to malloc also handled here. */
#include "config.h"
#undef FLOAT /* This is for hpux. They should change hpux. */
#undef FFS /* Some systems define this in param.h. */
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include <signal.h>
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif
#ifdef HAVE_SYS_TIMES_H
# include <sys/times.h>
#endif
#include "line-map.h"
#include "input.h"
#include "tree.h"
#include "rtl.h"
#include "tm_p.h"
#include "flags.h"
#include "insn-attr.h"
#include "insn-config.h"
#include "insn-flags.h"
#include "hard-reg-set.h"
#include "recog.h"
#include "output.h"
#include "except.h"
#include "function.h"
#include "toplev.h"
#include "expr.h"
#include "basic-block.h"
#include "intl.h"
#include "ggc.h"
#include "graph.h"
#include "regs.h"
#include "timevar.h"
#include "diagnostic.h"
#include "params.h"
#include "reload.h"
#include "dwarf2asm.h"
#include "integrate.h"
#include "real.h"
#include "debug.h"
#include "target.h"
#include "langhooks.h"
#include "cfglayout.h"
#include "cfgloop.h"
#include "hosthooks.h"
#include "cgraph.h"
#include "opts.h"
#include "coverage.h"
#include "value-prof.h"
#include "tree-inline.h"
#include "tree-flow.h"
#include "tree-pass.h"
#include "tree-dump.h"
#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
#include "dwarf2out.h"
#endif
#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
#include "dbxout.h"
#endif
#ifdef SDB_DEBUGGING_INFO
#include "sdbout.h"
#endif
#ifdef XCOFF_DEBUGGING_INFO
#include "xcoffout.h" /* Needed for external data
declarations for e.g. AIX 4.x. */
#endif
/* Global variables used to communicate with passes. */
int dump_flags;
bool in_gimple_form;
/* This is called from various places for FUNCTION_DECL, VAR_DECL,
and TYPE_DECL nodes.
This does nothing for local (non-static) variables, unless the
variable is a register variable with DECL_ASSEMBLER_NAME set. In
that case, or if the variable is not an automatic, it sets up the
RTL and outputs any assembler code (label definition, storage
allocation and initialization).
DECL is the declaration. TOP_LEVEL is nonzero
if this declaration is not within a function. */
void
rest_of_decl_compilation (tree decl,
int top_level,
int at_end)
{
/* We deferred calling assemble_alias so that we could collect
other attributes such as visibility. Emit the alias now. */
{
tree alias;
alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
if (alias)
{
alias = TREE_VALUE (TREE_VALUE (alias));
alias = get_identifier (TREE_STRING_POINTER (alias));
assemble_alias (decl, alias);
}
}
/* Can't defer this, because it needs to happen before any
later function definitions are processed. */
if (DECL_ASSEMBLER_NAME_SET_P (decl) && DECL_REGISTER (decl))
make_decl_rtl (decl);
/* Forward declarations for nested functions are not "external",
but we need to treat them as if they were. */
if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
|| TREE_CODE (decl) == FUNCTION_DECL)
{
timevar_push (TV_VARCONST);
/* Don't output anything when a tentative file-scope definition
is seen. But at end of compilation, do output code for them.
We do output all variables when unit-at-a-time is active and rely on
callgraph code to defer them except for forward declarations
(see gcc.c-torture/compile/920624-1.c) */
if ((at_end
|| !DECL_DEFER_OUTPUT (decl)
|| DECL_INITIAL (decl))
&& !DECL_EXTERNAL (decl))
{
if (TREE_CODE (decl) != FUNCTION_DECL)
cgraph_varpool_finalize_decl (decl);
else
assemble_variable (decl, top_level, at_end, 0);
}
#ifdef ASM_FINISH_DECLARE_OBJECT
if (decl == last_assemble_variable_decl)
{
ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
top_level, at_end);
}
#endif
timevar_pop (TV_VARCONST);
}
else if (TREE_CODE (decl) == TYPE_DECL
/* Like in rest_of_type_compilation, avoid confusing the debug
information machinery when there are errors. */
&& !(sorrycount || errorcount))
{
timevar_push (TV_SYMOUT);
debug_hooks->type_decl (decl, !top_level);
timevar_pop (TV_SYMOUT);
}
/* Let cgraph know about the existence of variables. */
if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
cgraph_varpool_node (decl);
}
/* Called after finishing a record, union or enumeral type. */
void
rest_of_type_compilation (tree type, int toplev)
{
/* Avoid confusing the debug information machinery when there are
errors. */
if (errorcount != 0 || sorrycount != 0)
return;
timevar_push (TV_SYMOUT);
debug_hooks->type_decl (TYPE_STUB_DECL (type), !toplev);
timevar_pop (TV_SYMOUT);
}
void
finish_optimization_passes (void)
{
enum tree_dump_index i;
struct dump_file_info *dfi;
char *name;
timevar_push (TV_DUMP);
if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
{
dump_file = dump_begin (pass_profile.static_pass_number, NULL);
end_branch_prob ();
if (dump_file)
dump_end (pass_profile.static_pass_number, dump_file);
}
if (optimize > 0)
{
dump_file = dump_begin (pass_combine.static_pass_number, NULL);
if (dump_file)
{
dump_combine_total_stats (dump_file);
dump_end (pass_combine.static_pass_number, dump_file);
}
}
/* Do whatever is necessary to finish printing the graphs. */
if (graph_dump_format != no_graph)
for (i = TDI_end; (dfi = get_dump_file_info (i)) != NULL; ++i)
if (dump_initialized_p (i)
&& (dfi->flags & TDF_GRAPH) != 0
&& (name = get_dump_file_name (i)) != NULL)
{
finish_graph_dump_file (name);
free (name);
}
timevar_pop (TV_DUMP);
}
static bool
gate_rest_of_compilation (void)
{
/* Early return if there were errors. We can run afoul of our
consistency checks, and there's not really much point in fixing them. */
return !(rtl_dump_and_exit || flag_syntax_only || errorcount || sorrycount);
}
struct tree_opt_pass pass_rest_of_compilation =
{
NULL, /* name */
gate_rest_of_compilation, /* gate */
NULL, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_REST_OF_COMPILATION, /* tv_id */
PROP_rtl, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_ggc_collect, /* todo_flags_finish */
0 /* letter */
};
static bool
gate_postreload (void)
{
return reload_completed;
}
struct tree_opt_pass pass_postreload =
{
NULL, /* name */
gate_postreload, /* gate */
NULL, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
0, /* tv_id */
PROP_rtl, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_ggc_collect, /* todo_flags_finish */
0 /* letter */
};
/* The root of the compilation pass tree, once constructed. */
struct tree_opt_pass *all_passes, *all_ipa_passes, *all_lowering_passes;
/* 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. */
static void
register_one_dump_file (struct tree_opt_pass *pass, bool ipa, int properties)
{
char *dot_name, *flag_name, *glob_name;
const char *prefix;
char num[10];
int flags;
/* 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);
if (ipa)
prefix = "ipa-", flags = TDF_IPA;
else if (properties & PROP_trees)
prefix = "tree-", flags = TDF_TREE;
else
prefix = "rtl-", flags = TDF_RTL;
flag_name = concat (prefix, pass->name, num, NULL);
glob_name = concat (prefix, pass->name, NULL);
pass->static_pass_number = dump_register (dot_name, flag_name, glob_name,
flags, pass->letter);
}
/* Recursive worker function for register_dump_files. */
static int
register_dump_files_1 (struct tree_opt_pass *pass, bool ipa, int properties)
{
do
{
int new_properties = (properties | pass->properties_provided)
& ~pass->properties_destroyed;
if (pass->name)
register_one_dump_file (pass, ipa, new_properties);
if (pass->sub)
new_properties = register_dump_files_1 (pass->sub, false,
new_properties);
/* If we have a gate, combine the properties that we could have with
and without the pass being examined. */
if (pass->gate)
properties &= new_properties;
else
properties = new_properties;
pass = pass->next;
}
while (pass);
return properties;
}
/* Register the dump files for the pipeline starting at PASS. IPA is
true if the pass is inter-procedural, and PROPERTIES reflects the
properties that are guaranteed to be available at the beginning of
the pipeline. */
static void
register_dump_files (struct tree_opt_pass *pass, bool ipa, int properties)
{
pass->properties_required |= properties;
pass->todo_flags_start |= TODO_set_props;
register_dump_files_1 (pass, ipa, properties);
}
/* Add a pass to the pass list. Duplicate the pass if it's already
in the list. */
static struct tree_opt_pass **
next_pass_1 (struct tree_opt_pass **list, struct tree_opt_pass *pass)
{
/* A nonzero 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;
}
/* Construct the pass tree. The sequencing of passes is driven by
the cgraph routines:
cgraph_finalize_compilation_unit ()
for each node N in the cgraph
cgraph_analyze_function (N)
cgraph_lower_function (N) -> all_lowering_passes
If we are optimizing, cgraph_optimize is then invoked:
cgraph_optimize ()
ipa_passes () -> all_ipa_passes
cgraph_expand_all_functions ()
for each node N in the cgraph
cgraph_expand_function (N)
cgraph_lower_function (N) -> Now a NOP.
lang_hooks.callgraph.expand_function (DECL (N))
tree_rest_of_compilation (DECL (N)) -> all_passes
*/
void
init_optimization_passes (void)
{
struct tree_opt_pass **p;
#define NEXT_PASS(PASS) (p = next_pass_1 (p, &PASS))
/* Interprocedural optimization passes. */
p = &all_ipa_passes;
NEXT_PASS (pass_early_ipa_inline);
NEXT_PASS (pass_early_local_passes);
NEXT_PASS (pass_ipa_cp);
NEXT_PASS (pass_ipa_inline);
NEXT_PASS (pass_ipa_reference);
NEXT_PASS (pass_ipa_pure_const);
NEXT_PASS (pass_ipa_type_escape);
NEXT_PASS (pass_ipa_pta);
*p = NULL;
/* All passes needed to lower the function into shape optimizers can
operate on. */
p = &all_lowering_passes;
NEXT_PASS (pass_remove_useless_stmts);
NEXT_PASS (pass_mudflap_1);
NEXT_PASS (pass_lower_omp);
NEXT_PASS (pass_lower_cf);
NEXT_PASS (pass_lower_eh);
NEXT_PASS (pass_build_cfg);
NEXT_PASS (pass_lower_complex_O0);
NEXT_PASS (pass_lower_vector);
NEXT_PASS (pass_warn_function_return);
NEXT_PASS (pass_early_tree_profile);
*p = NULL;
p = &pass_early_local_passes.sub;
NEXT_PASS (pass_tree_profile);
NEXT_PASS (pass_cleanup_cfg);
NEXT_PASS (pass_rebuild_cgraph_edges);
*p = NULL;
p = &all_passes;
NEXT_PASS (pass_fixup_cfg);
NEXT_PASS (pass_init_datastructures);
NEXT_PASS (pass_expand_omp);
NEXT_PASS (pass_all_optimizations);
NEXT_PASS (pass_warn_function_noreturn);
NEXT_PASS (pass_mudflap_2);
NEXT_PASS (pass_free_datastructures);
NEXT_PASS (pass_free_cfg_annotations);
NEXT_PASS (pass_expand);
NEXT_PASS (pass_rest_of_compilation);
NEXT_PASS (pass_clean_state);
*p = NULL;
p = &pass_all_optimizations.sub;
NEXT_PASS (pass_referenced_vars);
NEXT_PASS (pass_reset_cc_flags);
NEXT_PASS (pass_create_structure_vars);
NEXT_PASS (pass_build_ssa);
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_return_slot);
NEXT_PASS (pass_rename_ssa_copies);
NEXT_PASS (pass_early_warn_uninitialized);
/* Initial scalar cleanups. */
NEXT_PASS (pass_ccp);
NEXT_PASS (pass_fre);
NEXT_PASS (pass_dce);
NEXT_PASS (pass_forwprop);
NEXT_PASS (pass_copy_prop);
NEXT_PASS (pass_merge_phi);
NEXT_PASS (pass_vrp);
NEXT_PASS (pass_dce);
NEXT_PASS (pass_dominator);
/* The only const/copy propagation opportunities left after
DOM should be due to degenerate PHI nodes. So rather than
run the full propagators, run a specialized pass which
only examines PHIs to discover const/copy propagation
opportunities. */
NEXT_PASS (pass_phi_only_cprop);
NEXT_PASS (pass_phiopt);
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_tail_recursion);
NEXT_PASS (pass_profile);
NEXT_PASS (pass_ch);
NEXT_PASS (pass_stdarg);
NEXT_PASS (pass_lower_complex);
NEXT_PASS (pass_sra);
/* FIXME: SRA may generate arbitrary gimple code, exposing new
aliased and call-clobbered variables. As mentioned below,
pass_may_alias should be a TODO item. */
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_rename_ssa_copies);
NEXT_PASS (pass_dominator);
/* The only const/copy propagation opportunities left after
DOM should be due to degenerate PHI nodes. So rather than
run the full propagators, run a specialized pass which
only examines PHIs to discover const/copy propagation
opportunities. */
NEXT_PASS (pass_phi_only_cprop);
NEXT_PASS (pass_reassoc);
NEXT_PASS (pass_dce);
NEXT_PASS (pass_dse);
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_forwprop);
NEXT_PASS (pass_phiopt);
NEXT_PASS (pass_object_sizes);
NEXT_PASS (pass_store_ccp);
NEXT_PASS (pass_store_copy_prop);
NEXT_PASS (pass_fold_builtins);
/* FIXME: May alias should a TODO but for 4.0.0,
we add may_alias right after fold builtins
which can create arbitrary GIMPLE. */
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_split_crit_edges);
NEXT_PASS (pass_pre);
NEXT_PASS (pass_may_alias);
NEXT_PASS (pass_sink_code);
NEXT_PASS (pass_tree_loop);
NEXT_PASS (pass_cse_reciprocals);
NEXT_PASS (pass_reassoc);
NEXT_PASS (pass_vrp);
NEXT_PASS (pass_dominator);
/* The only const/copy propagation opportunities left after
DOM should be due to degenerate PHI nodes. So rather than
run the full propagators, run a specialized pass which
only examines PHIs to discover const/copy propagation
opportunities. */
NEXT_PASS (pass_phi_only_cprop);
NEXT_PASS (pass_cd_dce);
/* FIXME: If DCE is not run before checking for uninitialized uses,
we may get false warnings (e.g., testsuite/gcc.dg/uninit-5.c).
However, this also causes us to misdiagnose cases that should be
real warnings (e.g., testsuite/gcc.dg/pr18501.c).
To fix the false positives in uninit-5.c, we would have to
account for the predicates protecting the set and the use of each
variable. Using a representation like Gated Single Assignment
may help. */
NEXT_PASS (pass_late_warn_uninitialized);
NEXT_PASS (pass_dse);
NEXT_PASS (pass_forwprop);
NEXT_PASS (pass_phiopt);
NEXT_PASS (pass_tail_calls);
NEXT_PASS (pass_rename_ssa_copies);
NEXT_PASS (pass_uncprop);
NEXT_PASS (pass_del_ssa);
NEXT_PASS (pass_nrv);
NEXT_PASS (pass_mark_used_blocks);
NEXT_PASS (pass_cleanup_cfg_post_optimizing);
*p = NULL;
p = &pass_tree_loop.sub;
NEXT_PASS (pass_tree_loop_init);
NEXT_PASS (pass_copy_prop);
NEXT_PASS (pass_lim);
NEXT_PASS (pass_tree_unswitch);
NEXT_PASS (pass_scev_cprop);
NEXT_PASS (pass_empty_loop);
NEXT_PASS (pass_record_bounds);
NEXT_PASS (pass_linear_transform);
NEXT_PASS (pass_iv_canon);
NEXT_PASS (pass_if_conversion);
NEXT_PASS (pass_vectorize);
/* NEXT_PASS (pass_may_alias) cannot be done again because the
vectorizer creates alias relations that are not supported by
pass_may_alias. */
NEXT_PASS (pass_complete_unroll);
NEXT_PASS (pass_loop_prefetch);
NEXT_PASS (pass_iv_optimize);
NEXT_PASS (pass_tree_loop_done);
*p = NULL;
p = &pass_vectorize.sub;
NEXT_PASS (pass_lower_vector_ssa);
NEXT_PASS (pass_dce_loop);
*p = NULL;
p = &pass_loop2.sub;
NEXT_PASS (pass_rtl_loop_init);
NEXT_PASS (pass_rtl_move_loop_invariants);
NEXT_PASS (pass_rtl_unswitch);
NEXT_PASS (pass_rtl_unroll_and_peel_loops);
NEXT_PASS (pass_rtl_doloop);
NEXT_PASS (pass_rtl_loop_done);
*p = NULL;
p = &pass_rest_of_compilation.sub;
NEXT_PASS (pass_init_function);
NEXT_PASS (pass_jump);
NEXT_PASS (pass_insn_locators_initialize);
NEXT_PASS (pass_rtl_eh);
NEXT_PASS (pass_initial_value_sets);
NEXT_PASS (pass_unshare_all_rtl);
NEXT_PASS (pass_instantiate_virtual_regs);
NEXT_PASS (pass_jump2);
NEXT_PASS (pass_cse);
NEXT_PASS (pass_gcse);
NEXT_PASS (pass_jump_bypass);
NEXT_PASS (pass_rtl_ifcvt);
NEXT_PASS (pass_tracer);
/* Perform loop optimizations. It might be better to do them a bit
sooner, but we want the profile feedback to work more
efficiently. */
NEXT_PASS (pass_loop2);
NEXT_PASS (pass_web);
NEXT_PASS (pass_cse2);
NEXT_PASS (pass_life);
NEXT_PASS (pass_combine);
NEXT_PASS (pass_if_after_combine);
NEXT_PASS (pass_partition_blocks);
NEXT_PASS (pass_regmove);
NEXT_PASS (pass_split_all_insns);
NEXT_PASS (pass_mode_switching);
NEXT_PASS (pass_see);
NEXT_PASS (pass_recompute_reg_usage);
NEXT_PASS (pass_sms);
NEXT_PASS (pass_sched);
NEXT_PASS (pass_local_alloc);
NEXT_PASS (pass_global_alloc);
NEXT_PASS (pass_postreload);
*p = NULL;
p = &pass_postreload.sub;
NEXT_PASS (pass_postreload_cse);
NEXT_PASS (pass_gcse2);
NEXT_PASS (pass_flow2);
NEXT_PASS (pass_rtl_seqabstr);
NEXT_PASS (pass_stack_adjustments);
NEXT_PASS (pass_peephole2);
NEXT_PASS (pass_if_after_reload);
NEXT_PASS (pass_regrename);
NEXT_PASS (pass_reorder_blocks);
NEXT_PASS (pass_branch_target_load_optimize);
NEXT_PASS (pass_leaf_regs);
NEXT_PASS (pass_sched2);
NEXT_PASS (pass_split_before_regstack);
NEXT_PASS (pass_stack_regs);
NEXT_PASS (pass_compute_alignments);
NEXT_PASS (pass_duplicate_computed_gotos);
NEXT_PASS (pass_variable_tracking);
NEXT_PASS (pass_free_cfg);
NEXT_PASS (pass_machine_reorg);
NEXT_PASS (pass_purge_lineno_notes);
NEXT_PASS (pass_cleanup_barriers);
NEXT_PASS (pass_delay_slots);
NEXT_PASS (pass_split_for_shorten_branches);
NEXT_PASS (pass_convert_to_eh_region_ranges);
NEXT_PASS (pass_shorten_branches);
NEXT_PASS (pass_set_nothrow_function_flags);
NEXT_PASS (pass_final);
*p = NULL;
#undef NEXT_PASS
/* Register the passes with the tree dump code. */
register_dump_files (all_ipa_passes, true,
PROP_gimple_any | PROP_gimple_lcf | PROP_gimple_leh
| PROP_cfg);
register_dump_files (all_lowering_passes, false, PROP_gimple_any);
register_dump_files (all_passes, false,
PROP_gimple_any | PROP_gimple_lcf | PROP_gimple_leh
| PROP_cfg);
}
static unsigned int last_verified;
static unsigned int curr_properties;
static void
execute_todo (unsigned int flags)
{
#if defined ENABLE_CHECKING
if (need_ssa_update_p ())
gcc_assert (flags & TODO_update_ssa_any);
#endif
if (curr_properties & PROP_ssa)
flags |= TODO_verify_ssa;
flags &= ~last_verified;
if (!flags)
return;
/* Always recalculate SMT usage before doing anything else. */
if (flags & TODO_update_smt_usage)
recalculate_used_alone ();
/* Always cleanup the CFG before trying to update SSA . */
if (flags & TODO_cleanup_cfg)
{
/* CFG Cleanup can cause a constant to prop into an ARRAY_REF. */
updating_used_alone = true;
if (current_loops)
cleanup_tree_cfg_loop ();
else
cleanup_tree_cfg ();
/* Update the used alone after cleanup cfg. */
recalculate_used_alone ();
/* When cleanup_tree_cfg merges consecutive blocks, it may
perform some simplistic propagation when removing single
valued PHI nodes. This propagation may, in turn, cause the
SSA form to become out-of-date (see PR 22037). So, even
if the parent pass had not scheduled an SSA update, we may
still need to do one. */
if (!(flags & TODO_update_ssa_any) && need_ssa_update_p ())
flags |= TODO_update_ssa;
}
if (flags & TODO_update_ssa_any)
{
unsigned update_flags = flags & TODO_update_ssa_any;
update_ssa (update_flags);
last_verified &= ~TODO_verify_ssa;
}
if (flags & TODO_remove_unused_locals)
remove_unused_locals ();
if ((flags & TODO_dump_func)
&& dump_file && current_function_decl)
{
if (curr_properties & PROP_trees)
dump_function_to_file (current_function_decl,
dump_file, dump_flags);
else
{
if (dump_flags & TDF_SLIM)
print_rtl_slim_with_bb (dump_file, get_insns (), dump_flags);
else if ((curr_properties & PROP_cfg) && (dump_flags & TDF_BLOCKS))
print_rtl_with_bb (dump_file, get_insns ());
else
print_rtl (dump_file, get_insns ());
if (curr_properties & PROP_cfg
&& graph_dump_format != no_graph
&& (dump_flags & TDF_GRAPH))
print_rtl_graph_with_bb (dump_file_name, get_insns ());
}
/* Flush the file. If verification fails, we won't be able to
close the file before aborting. */
fflush (dump_file);
}
if ((flags & TODO_dump_cgraph)
&& dump_file && !current_function_decl)
{
dump_cgraph (dump_file);
/* 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 ();
}
#if defined ENABLE_CHECKING
if (flags & TODO_verify_ssa)
verify_ssa (true);
if (flags & TODO_verify_flow)
verify_flow_info ();
if (flags & TODO_verify_stmts)
verify_stmts ();
if (flags & TODO_verify_loops)
verify_loop_closed_ssa ();
#endif
last_verified = flags & TODO_verify_all;
}
/* Verify invariants that should hold between passes. This is a place
to put simple sanity checks. */
static void
verify_interpass_invariants (void)
{
#ifdef ENABLE_CHECKING
gcc_assert (!fold_deferring_overflow_warnings_p ());
#endif
}
static bool
execute_one_pass (struct tree_opt_pass *pass)
{
bool initializing_dump;
unsigned int todo_after = 0;
/* See if we're supposed to run this pass. */
if (pass->gate && !pass->gate ())
return false;
if (pass->todo_flags_start & TODO_set_props)
curr_properties = pass->properties_required;
/* Note that the folders should only create gimple expressions.
This is a hack until the new folder is ready. */
in_gimple_form = (curr_properties & PROP_trees) != 0;
/* Run pre-pass verification. */
execute_todo (pass->todo_flags_start);
gcc_assert ((curr_properties & pass->properties_required)
== pass->properties_required);
if (pass->properties_destroyed & PROP_smt_usage)
updating_used_alone = true;
/* If a dump file name is present, open it if enabled. */
if (pass->static_pass_number != -1)
{
initializing_dump = !dump_initialized_p (pass->static_pass_number);
dump_file_name = get_dump_file_name (pass->static_pass_number);
dump_file = dump_begin (pass->static_pass_number, &dump_flags);
if (dump_file && current_function_decl)
{
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)%s\n\n", dname, aname,
cfun->function_frequency == FUNCTION_FREQUENCY_HOT
? " (hot)"
: cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
? " (unlikely executed)"
: "");
}
}
else
initializing_dump = false;
/* If a timevar is present, start it. */
if (pass->tv_id)
timevar_push (pass->tv_id);
/* Do it! */
if (pass->execute)
{
todo_after = pass->execute ();
last_verified = 0;
}
/* Stop timevar. */
if (pass->tv_id)
timevar_pop (pass->tv_id);
curr_properties = (curr_properties | pass->properties_provided)
& ~pass->properties_destroyed;
if (initializing_dump
&& dump_file
&& graph_dump_format != no_graph
&& (curr_properties & (PROP_cfg | PROP_rtl)) == (PROP_cfg | PROP_rtl))
{
get_dump_file_info (pass->static_pass_number)->flags |= TDF_GRAPH;
dump_flags |= TDF_GRAPH;
clean_graph_dump_file (dump_file_name);
}
/* Run post-pass cleanup and verification. */
execute_todo (todo_after | pass->todo_flags_finish);
verify_interpass_invariants ();
/* Flush and close dump file. */
if (dump_file_name)
{
free ((char *) dump_file_name);
dump_file_name = NULL;
}
if (dump_file)
{
dump_end (pass->static_pass_number, dump_file);
dump_file = NULL;
}
if (pass->properties_destroyed & PROP_smt_usage)
updating_used_alone = false;
/* Reset in_gimple_form to not break non-unit-at-a-time mode. */
in_gimple_form = false;
return true;
}
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);
}
/* Same as execute_pass_list but assume that subpasses of IPA passes
are local passes. */
void
execute_ipa_pass_list (struct tree_opt_pass *pass)
{
do
{
if (execute_one_pass (pass) && pass->sub)
{
struct cgraph_node *node;
for (node = cgraph_nodes; node; node = node->next)
if (node->analyzed)
{
push_cfun (DECL_STRUCT_FUNCTION (node->decl));
current_function_decl = node->decl;
execute_pass_list (pass->sub);
free_dominance_info (CDI_DOMINATORS);
free_dominance_info (CDI_POST_DOMINATORS);
current_function_decl = NULL;
pop_cfun ();
ggc_collect ();
}
}
pass = pass->next;
}
while (pass);
}
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