/* Data flow functions for trees.
- Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
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)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
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, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "hashtab.h"
+#include "pointer-set.h"
#include "tree.h"
#include "rtl.h"
#include "tm_p.h"
#include "hard-reg-set.h"
#include "basic-block.h"
#include "output.h"
-#include "errors.h"
#include "timevar.h"
#include "expr.h"
#include "ggc.h"
#include "tree-gimple.h"
#include "tree-flow.h"
#include "tree-inline.h"
-#include "tree-alias-common.h"
#include "tree-pass.h"
#include "convert.h"
#include "params.h"
+#include "cgraph.h"
/* Build and maintain data flow information for trees. */
long num_phis;
long num_phi_args;
int max_num_phi_args;
- long num_v_may_defs;
+ long num_vdefs;
long num_vuses;
- long num_v_must_defs;
-};
-
-
-/* State information for find_vars_r. */
-struct walk_state
-{
- /* Hash table used to avoid adding the same variable more than once. */
- htab_t vars_found;
};
/* Local functions. */
static void collect_dfa_stats (struct dfa_stats_d *);
static tree collect_dfa_stats_r (tree *, int *, void *);
-static void add_immediate_use (tree, tree);
static tree find_vars_r (tree *, int *, void *);
-static void add_referenced_var (tree, struct walk_state *);
-static void compute_immediate_uses_for_phi (tree, bool (*)(tree));
-static void compute_immediate_uses_for_stmt (tree, int, bool (*)(tree));
-static void find_hidden_use_vars (tree);
-static tree find_hidden_use_vars_r (tree *, int *, void *);
-
-
-/* Global declarations. */
-
-/* Array of all variables referenced in the function. */
-varray_type referenced_vars;
/*---------------------------------------------------------------------------
various attributes for each variable used by alias analysis and the
optimizer. */
-static void
+static unsigned int
find_referenced_vars (void)
{
- htab_t vars_found;
basic_block bb;
block_stmt_iterator si;
- struct walk_state walk_state;
- tree block;
-
- /* This is the very first pass in preparation for building the SSA
- form of the function, so initialize internal data structures now. */
- init_tree_ssa ();
-
- /* Walk the lexical blocks in the function looking for variables that may
- have been used to declare VLAs and for nested functions. Both
- constructs create hidden uses of variables.
-
- Note that at this point we may have multiple blocks hung off
- DECL_INITIAL chained through the BLOCK_CHAIN field due to
- how inlining works. Egad. */
- block = DECL_INITIAL (current_function_decl);
- while (block)
- {
- find_hidden_use_vars (block);
- block = BLOCK_CHAIN (block);
- }
-
- vars_found = htab_create (50, htab_hash_pointer, htab_eq_pointer, NULL);
- memset (&walk_state, 0, sizeof (walk_state));
- walk_state.vars_found = vars_found;
FOR_EACH_BB (bb)
for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
{
tree *stmt_p = bsi_stmt_ptr (si);
- walk_tree (stmt_p, find_vars_r, &walk_state, NULL);
+ walk_tree (stmt_p, find_vars_r, NULL, NULL);
}
- htab_delete (vars_found);
+ return 0;
}
struct tree_opt_pass pass_referenced_vars =
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
- 0, /* tv_id */
+ TV_FIND_REFERENCED_VARS, /* tv_id */
PROP_gimple_leh | PROP_cfg, /* properties_required */
PROP_referenced_vars, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0, /* todo_flags_finish */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
};
-/* Compute immediate uses.
-
- CALC_FOR is an optional function pointer which indicates whether
- immediate uses information should be calculated for a given SSA
- variable. If NULL, then information is computed for all
- variables.
-
- FLAGS is one of {TDFA_USE_OPS, TDFA_USE_VOPS}. It is used by
- compute_immediate_uses_for_stmt to determine whether to look at
- virtual and/or real operands while computing def-use chains. */
-
-void
-compute_immediate_uses (int flags, bool (*calc_for)(tree))
-{
- basic_block bb;
- block_stmt_iterator si;
-
- FOR_EACH_BB (bb)
- {
- tree phi;
-
- for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
- compute_immediate_uses_for_phi (phi, calc_for);
-
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
- {
- tree stmt = bsi_stmt (si);
- get_stmt_operands (stmt);
- compute_immediate_uses_for_stmt (stmt, flags, calc_for);
- }
- }
-}
-
-
-/* Invalidates dataflow information for a statement STMT. */
-
-static void
-free_df_for_stmt (tree stmt)
-{
- stmt_ann_t ann = stmt_ann (stmt);
-
- if (ann && ann->df)
- {
- /* If we have a varray of immediate uses, then go ahead and release
- it for re-use. */
- if (ann->df->immediate_uses)
- ggc_free (ann->df->immediate_uses);
-
- /* Similarly for the main dataflow structure. */
- ggc_free (ann->df);
- ann->df = NULL;
- }
-}
-
-
-/* Invalidate dataflow information for the whole function. */
-
-void
-free_df (void)
-{
- basic_block bb;
- block_stmt_iterator si;
-
- FOR_EACH_BB (bb)
- {
- tree phi;
-
- for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
- free_df_for_stmt (phi);
-
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
- {
- tree stmt = bsi_stmt (si);
- free_df_for_stmt (stmt);
- }
- }
-}
-
-
-/* Helper for compute_immediate_uses. Check all the USE and/or VUSE
- operands in phi node PHI and add a def-use edge between their
- defining statement and PHI. CALC_FOR is as in
- compute_immediate_uses.
-
- PHI nodes are easy, we only need to look at their arguments. */
-
-static void
-compute_immediate_uses_for_phi (tree phi, bool (*calc_for)(tree))
-{
- int i;
-
-#ifdef ENABLE_CHECKING
- if (TREE_CODE (phi) != PHI_NODE)
- abort ();
-#endif
-
- for (i = 0; i < PHI_NUM_ARGS (phi); i++)
- {
- tree arg = PHI_ARG_DEF (phi, i);
-
- if (TREE_CODE (arg) == SSA_NAME && (!calc_for || calc_for (arg)))
- {
- tree imm_rdef_stmt = SSA_NAME_DEF_STMT (PHI_ARG_DEF (phi, i));
- if (!IS_EMPTY_STMT (imm_rdef_stmt))
- add_immediate_use (imm_rdef_stmt, phi);
- }
- }
-}
-
-
-/* Another helper for compute_immediate_uses. Depending on the value
- of FLAGS, check all the USE and/or VUSE operands in STMT and add a
- def-use edge between their defining statement and STMT. CALC_FOR
- is as in compute_immediate_uses. */
-
-static void
-compute_immediate_uses_for_stmt (tree stmt, int flags, bool (*calc_for)(tree))
-{
- size_t i;
- use_optype uses;
- vuse_optype vuses;
- v_may_def_optype v_may_defs;
- stmt_ann_t ann;
-
-#ifdef ENABLE_CHECKING
- /* PHI nodes are handled elsewhere. */
- if (TREE_CODE (stmt) == PHI_NODE)
- abort ();
-#endif
-
- /* Look at USE_OPS or VUSE_OPS according to FLAGS. */
- ann = stmt_ann (stmt);
- if (flags & TDFA_USE_OPS)
- {
- uses = USE_OPS (ann);
- for (i = 0; i < NUM_USES (uses); i++)
- {
- tree use = USE_OP (uses, i);
- tree imm_stmt = SSA_NAME_DEF_STMT (use);
- if (!IS_EMPTY_STMT (imm_stmt) && (!calc_for || calc_for (use)))
- add_immediate_use (imm_stmt, stmt);
- }
- }
-
- if (flags & TDFA_USE_VOPS)
- {
- vuses = VUSE_OPS (ann);
- for (i = 0; i < NUM_VUSES (vuses); i++)
- {
- tree vuse = VUSE_OP (vuses, i);
- tree imm_rdef_stmt = SSA_NAME_DEF_STMT (vuse);
- if (!IS_EMPTY_STMT (imm_rdef_stmt) && (!calc_for || calc_for (vuse)))
- add_immediate_use (imm_rdef_stmt, stmt);
- }
-
- v_may_defs = V_MAY_DEF_OPS (ann);
- for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
- {
- tree vuse = V_MAY_DEF_OP (v_may_defs, i);
- tree imm_rdef_stmt = SSA_NAME_DEF_STMT (vuse);
- if (!IS_EMPTY_STMT (imm_rdef_stmt) && (!calc_for || calc_for (vuse)))
- add_immediate_use (imm_rdef_stmt, stmt);
- }
- }
-}
-
-
-/* Add statement USE_STMT to the list of statements that use definitions
- made by STMT. */
+/*---------------------------------------------------------------------------
+ Manage annotations
+---------------------------------------------------------------------------*/
+/* Create a new annotation for a _DECL node T. */
-static void
-add_immediate_use (tree stmt, tree use_stmt)
+var_ann_t
+create_var_ann (tree t)
{
- stmt_ann_t ann = get_stmt_ann (stmt);
- struct dataflow_d *df;
+ var_ann_t ann;
+ struct static_var_ann_d *sann = NULL;
- df = ann->df;
- if (df == NULL)
- {
- df = ann->df = ggc_alloc (sizeof (struct dataflow_d));
- memset ((void *) df, 0, sizeof (struct dataflow_d));
- df->uses[0] = use_stmt;
- return;
- }
+ gcc_assert (t);
+ gcc_assert (DECL_P (t));
+ gcc_assert (!t->base.ann || t->base.ann->common.type == VAR_ANN);
- if (!df->uses[1])
+ if (!MTAG_P (t) && (TREE_STATIC (t) || DECL_EXTERNAL (t)))
{
- df->uses[1] = use_stmt;
- return;
+ sann = GGC_CNEW (struct static_var_ann_d);
+ ann = &sann->ann;
}
+ else
+ ann = GGC_CNEW (struct var_ann_d);
- if (ann->df->immediate_uses == NULL)
- VARRAY_TREE_INIT (ann->df->immediate_uses, 4, "immediate_uses");
-
- VARRAY_PUSH_TREE (ann->df->immediate_uses, use_stmt);
-}
-
-
-/* If the immediate use of USE points to OLD, then redirect it to NEW. */
-
-static void
-redirect_immediate_use (tree use, tree old, tree new)
-{
- tree imm_stmt = SSA_NAME_DEF_STMT (use);
- struct dataflow_d *df = get_stmt_ann (imm_stmt)->df;
- unsigned int num_uses = num_immediate_uses (df);
- unsigned int i;
+ ann->common.type = VAR_ANN;
- for (i = 0; i < num_uses; i++)
+ if (!MTAG_P (t) && (TREE_STATIC (t) || DECL_EXTERNAL (t)))
{
- if (immediate_use (df, i) == old)
- {
- if (i == 0 || i == 1)
- df->uses[i] = new;
- else
- VARRAY_TREE (df->immediate_uses, i - 2) = new;
- }
+ void **slot;
+ sann->uid = DECL_UID (t);
+ slot = htab_find_slot_with_hash (gimple_var_anns (cfun),
+ t, DECL_UID (t), INSERT);
+ gcc_assert (!*slot);
+ *slot = sann;
}
-}
-
-
-/* Redirect all immediate uses for operands in OLD so that they point
- to NEW. This routine should have no knowledge of how immediate
- uses are stored. */
-
-void
-redirect_immediate_uses (tree old, tree new)
-{
- stmt_ann_t ann = get_stmt_ann (old);
- use_optype uses = USE_OPS (ann);
- vuse_optype vuses = VUSE_OPS (ann);
- v_may_def_optype v_may_defs = V_MAY_DEF_OPS (ann);
- unsigned int i;
-
- /* Look at USE_OPS or VUSE_OPS according to FLAGS. */
- for (i = 0; i < NUM_USES (uses); i++)
- redirect_immediate_use (USE_OP (uses, i), old, new);
-
- for (i = 0; i < NUM_VUSES (vuses); i++)
- redirect_immediate_use (VUSE_OP (vuses, i), old, new);
+ else
+ t->base.ann = (tree_ann_t) ann;
- for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
- redirect_immediate_use (V_MAY_DEF_OP (v_may_defs, i), old, new);
+ return ann;
}
+/* Create a new annotation for a FUNCTION_DECL node T. */
-/*---------------------------------------------------------------------------
- Manage annotations
----------------------------------------------------------------------------*/
-/* Create a new annotation for a _DECL node T. */
-
-var_ann_t
-create_var_ann (tree t)
+function_ann_t
+create_function_ann (tree t)
{
- var_ann_t ann;
+ function_ann_t ann;
-#if defined ENABLE_CHECKING
- if (t == NULL_TREE
- || !DECL_P (t)
- || (t->common.ann
- && t->common.ann->common.type != VAR_ANN))
- abort ();
-#endif
+ gcc_assert (t);
+ gcc_assert (TREE_CODE (t) == FUNCTION_DECL);
+ gcc_assert (!t->base.ann || t->base.ann->common.type == FUNCTION_ANN);
ann = ggc_alloc (sizeof (*ann));
memset ((void *) ann, 0, sizeof (*ann));
- ann->common.type = VAR_ANN;
+ ann->common.type = FUNCTION_ANN;
- t->common.ann = (tree_ann) ann;
+ t->base.ann = (tree_ann_t) ann;
return ann;
}
-
/* Create a new annotation for a statement node T. */
stmt_ann_t
{
stmt_ann_t ann;
-#if defined ENABLE_CHECKING
- if ((!is_gimple_stmt (t))
- || (t->common.ann
- && t->common.ann->common.type != STMT_ANN))
- abort ();
-#endif
+ gcc_assert (is_gimple_stmt (t));
+ gcc_assert (!t->base.ann || t->base.ann->common.type == STMT_ANN);
- ann = ggc_alloc (sizeof (*ann));
- memset ((void *) ann, 0, sizeof (*ann));
+ ann = GGC_CNEW (struct stmt_ann_d);
ann->common.type = STMT_ANN;
/* Since we just created the annotation, mark the statement modified. */
ann->modified = true;
- t->common.ann = (tree_ann) ann;
+ t->base.ann = (tree_ann_t) ann;
return ann;
}
+/* Create a new annotation for a tree T. */
-/* Create a new annotation for a constant T. */
-
-cst_ann_t
-create_cst_ann (tree t)
+tree_ann_common_t
+create_tree_common_ann (tree t)
{
- cst_ann_t ann;
+ tree_ann_common_t ann;
-#if defined ENABLE_CHECKING
- if (t == NULL_TREE
- || (t->common.ann
- && t->common.ann->common.type != CST_ANN))
- abort ();
-#endif
+ gcc_assert (t);
+ gcc_assert (!t->base.ann || t->base.ann->common.type == TREE_ANN_COMMON);
- ann = ggc_alloc (sizeof (*ann));
- memset ((void *) ann, 0, sizeof (*ann));
-
- ann->common.type = CST_ANN;
- t->common.ann = (tree_ann) ann;
-
- return ann;
-}
-
-/* Create a new annotation for an expression T. */
-
-expr_ann_t
-create_expr_ann (tree t)
-{
- expr_ann_t ann;
-
-#if defined ENABLE_CHECKING
- if (t == NULL_TREE
- || (t->common.ann
- && t->common.ann->common.type != EXPR_ANN))
- abort ();
-#endif
-
- ann = ggc_alloc (sizeof (*ann));
- memset ((void *) ann, 0, sizeof (*ann));
+ ann = GGC_CNEW (struct tree_ann_common_d);
- ann->common.type = EXPR_ANN;
- t->common.ann = (tree_ann) ann;
+ ann->type = TREE_ANN_COMMON;
+ t->base.ann = (tree_ann_t) ann;
return ann;
}
make_rename_temp (tree type, const char *prefix)
{
tree t = create_tmp_var (type, prefix);
- add_referenced_tmp_var (t);
- bitmap_set_bit (vars_to_rename, var_ann (t)->uid);
+
+ if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
+ || TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
+ DECL_GIMPLE_REG_P (t) = 1;
+
+ if (gimple_referenced_vars (cfun))
+ {
+ add_referenced_var (t);
+ mark_sym_for_renaming (t);
+ }
+
return t;
}
void
dump_referenced_vars (FILE *file)
{
- size_t i;
-
- fprintf (file, "\nReferenced variables in %s: %u\n\n",
+ tree var;
+ referenced_var_iterator rvi;
+
+ fprintf (file, "\nReferenced variables in %s: %u\n\n",
get_name (current_function_decl), (unsigned) num_referenced_vars);
-
- for (i = 0; i < num_referenced_vars; i++)
+
+ FOR_EACH_REFERENCED_VAR (var, rvi)
{
- tree var = referenced_var (i);
fprintf (file, "Variable: ");
dump_variable (file, var);
fprintf (file, "\n");
}
+/* Dump sub-variables for VAR to FILE. */
+
+void
+dump_subvars_for (FILE *file, tree var)
+{
+ subvar_t sv = get_subvars_for_var (var);
+
+ if (!sv)
+ return;
+
+ fprintf (file, "{ ");
+
+ for (; sv; sv = sv->next)
+ {
+ print_generic_expr (file, sv->var, dump_flags);
+ fprintf (file, " ");
+ }
+
+ fprintf (file, "}");
+}
+
+
+/* Dumb sub-variables for VAR to stderr. */
+
+void
+debug_subvars_for (tree var)
+{
+ dump_subvars_for (stderr, var);
+}
+
+
/* Dump variable VAR and its may-aliases to FILE. */
void
{
var_ann_t ann;
+ if (TREE_CODE (var) == SSA_NAME)
+ {
+ if (POINTER_TYPE_P (TREE_TYPE (var)))
+ dump_points_to_info_for (file, var);
+ var = SSA_NAME_VAR (var);
+ }
+
if (var == NULL_TREE)
{
fprintf (file, "<nil>");
}
print_generic_expr (file, var, dump_flags);
-
- if (TREE_CODE (var) == SSA_NAME)
- var = SSA_NAME_VAR (var);
ann = var_ann (var);
- fprintf (file, ", UID %u", (unsigned) ann->uid);
+ fprintf (file, ", UID D.%u", (unsigned) DECL_UID (var));
- if (ann->has_hidden_use)
- fprintf (file, ", has hidden uses");
+ fprintf (file, ", ");
+ print_generic_expr (file, TREE_TYPE (var), dump_flags);
- if (ann->type_mem_tag)
+ if (ann && ann->symbol_mem_tag)
{
- fprintf (file, ", type memory tag: ");
- print_generic_expr (file, ann->type_mem_tag, dump_flags);
+ fprintf (file, ", symbol memory tag: ");
+ print_generic_expr (file, ann->symbol_mem_tag, dump_flags);
}
- if (ann->is_alias_tag)
- fprintf (file, ", is an alias tag");
+ if (TREE_ADDRESSABLE (var))
+ fprintf (file, ", is addressable");
+
+ if (is_global_var (var))
+ fprintf (file, ", is global");
+
+ if (TREE_THIS_VOLATILE (var))
+ fprintf (file, ", is volatile");
- if (needs_to_live_in_memory (var))
- fprintf (file, ", is %s", TREE_STATIC (var) ? "static" : "global");
+ if (mem_sym_stats (cfun, var))
+ {
+ mem_sym_stats_t stats = mem_sym_stats (cfun, var);
+ fprintf (file, ", direct reads: %ld", stats->num_direct_reads);
+ fprintf (file, ", direct writes: %ld", stats->num_direct_writes);
+ fprintf (file, ", indirect reads: %ld", stats->num_indirect_reads);
+ fprintf (file, ", indirect writes: %ld", stats->num_indirect_writes);
+ fprintf (file, ", read frequency: %ld", stats->frequency_reads);
+ fprintf (file, ", write frequency: %ld", stats->frequency_writes);
+ }
if (is_call_clobbered (var))
- fprintf (file, ", call clobbered");
+ {
+ const char *s = "";
+ var_ann_t va = var_ann (var);
+ unsigned int escape_mask = va->escape_mask;
+
+ fprintf (file, ", call clobbered");
+ fprintf (file, " (");
+ if (escape_mask & ESCAPE_STORED_IN_GLOBAL)
+ { fprintf (file, "%sstored in global", s); s = ", "; }
+ if (escape_mask & ESCAPE_TO_ASM)
+ { fprintf (file, "%sgoes through ASM", s); s = ", "; }
+ if (escape_mask & ESCAPE_TO_CALL)
+ { fprintf (file, "%spassed to call", s); s = ", "; }
+ if (escape_mask & ESCAPE_BAD_CAST)
+ { fprintf (file, "%sbad cast", s); s = ", "; }
+ if (escape_mask & ESCAPE_TO_RETURN)
+ { fprintf (file, "%sreturned from func", s); s = ", "; }
+ if (escape_mask & ESCAPE_TO_PURE_CONST)
+ { fprintf (file, "%spassed to pure/const", s); s = ", "; }
+ if (escape_mask & ESCAPE_IS_GLOBAL)
+ { fprintf (file, "%sis global var", s); s = ", "; }
+ if (escape_mask & ESCAPE_IS_PARM)
+ { fprintf (file, "%sis incoming pointer", s); s = ", "; }
+ if (escape_mask & ESCAPE_UNKNOWN)
+ { fprintf (file, "%sunknown escape", s); s = ", "; }
+ fprintf (file, ")");
+ }
+
+ if (ann->noalias_state == NO_ALIAS)
+ fprintf (file, ", NO_ALIAS (does not alias other NO_ALIAS symbols)");
+ else if (ann->noalias_state == NO_ALIAS_GLOBAL)
+ fprintf (file, ", NO_ALIAS_GLOBAL (does not alias other NO_ALIAS symbols"
+ " and global vars)");
+ else if (ann->noalias_state == NO_ALIAS_ANYTHING)
+ fprintf (file, ", NO_ALIAS_ANYTHING (does not alias any other symbols)");
- if (ann->default_def)
+ if (gimple_default_def (cfun, var))
{
fprintf (file, ", default def: ");
- print_generic_expr (file, ann->default_def, dump_flags);
+ print_generic_expr (file, gimple_default_def (cfun, var), dump_flags);
}
- if (ann->may_aliases)
+ if (MTAG_P (var) && may_aliases (var))
{
fprintf (file, ", may aliases: ");
dump_may_aliases_for (file, var);
}
- fprintf (file, "\n");
-}
-
-
-/* Dump variable VAR and its may-aliases to stderr. */
-
-void
-debug_variable (tree var)
-{
- dump_variable (stderr, var);
-}
-
-
-/* Dump def-use edges on FILE. */
-
-void
-dump_immediate_uses (FILE *file)
-{
- basic_block bb;
- block_stmt_iterator si;
- const char *funcname
- = lang_hooks.decl_printable_name (current_function_decl, 2);
-
- fprintf (file, "\nDef-use edges for function %s\n", funcname);
-
- FOR_EACH_BB (bb)
+ if (get_subvars_for_var (var))
{
- tree phi;
-
- for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
- dump_immediate_uses_for (file, phi);
-
- for (si = bsi_start (bb); !bsi_end_p (si); bsi_next (&si))
- dump_immediate_uses_for (file, bsi_stmt (si));
+ fprintf (file, ", sub-vars: ");
+ dump_subvars_for (file, var);
}
- fprintf (file, "\n");
-}
-
-
-/* Dump def-use edges on stderr. */
-
-void
-debug_immediate_uses (void)
-{
- dump_immediate_uses (stderr);
-}
-
-
-/* Dump all immediate uses for STMT on FILE. */
-
-void
-dump_immediate_uses_for (FILE *file, tree stmt)
-{
- dataflow_t df = get_immediate_uses (stmt);
- int num_imm_uses = num_immediate_uses (df);
-
- if (num_imm_uses > 0)
+ if (!is_gimple_reg (var))
{
- int i;
-
- fprintf (file, "-> ");
- print_generic_stmt (file, stmt, TDF_SLIM);
- fprintf (file, "\n");
-
- for (i = 0; i < num_imm_uses; i++)
+ if (memory_partition (var))
{
- fprintf (file, "\t");
- print_generic_stmt (file, immediate_use (df, i), TDF_SLIM);
- fprintf (file, "\n");
+ fprintf (file, ", belongs to partition: ");
+ print_generic_expr (file, memory_partition (var), dump_flags);
}
- fprintf (file, "\n");
+ if (TREE_CODE (var) == MEMORY_PARTITION_TAG)
+ {
+ fprintf (file, ", partition symbols: ");
+ dump_decl_set (file, MPT_SYMBOLS (var));
+ }
}
+
+ fprintf (file, "\n");
}
-/* Dump immediate uses for STMT on stderr. */
+/* Dump variable VAR and its may-aliases to stderr. */
void
-debug_immediate_uses_for (tree stmt)
+debug_variable (tree var)
{
- dump_immediate_uses_for (stderr, stmt);
+ dump_variable (stderr, var);
}
size = num_referenced_vars * sizeof (tree);
total += size;
- fprintf (file, fmt_str_1, "Referenced variables", num_referenced_vars,
+ fprintf (file, fmt_str_1, "Referenced variables", (unsigned long)num_referenced_vars,
SCALE (size), LABEL (size));
size = dfa_stats.num_stmt_anns * sizeof (struct stmt_ann_d);
fprintf (file, fmt_str_1, "VUSE operands", dfa_stats.num_vuses,
SCALE (size), LABEL (size));
- size = dfa_stats.num_v_may_defs * sizeof (tree *);
- total += size;
- fprintf (file, fmt_str_1, "V_MAY_DEF operands", dfa_stats.num_v_may_defs,
- SCALE (size), LABEL (size));
-
- size = dfa_stats.num_v_must_defs * sizeof (tree *);
+ size = dfa_stats.num_vdefs * sizeof (tree *);
total += size;
- fprintf (file, fmt_str_1, "V_MUST_DEF operands", dfa_stats.num_v_must_defs,
+ fprintf (file, fmt_str_1, "VDEF operands", dfa_stats.num_vdefs,
SCALE (size), LABEL (size));
size = dfa_stats.num_phis * sizeof (struct tree_phi_node);
}
-/* Collect DFA statistics and store them in the structure pointed by
+/* Collect DFA statistics and store them in the structure pointed to by
DFA_STATS_P. */
static void
collect_dfa_stats (struct dfa_stats_d *dfa_stats_p)
{
- htab_t htab;
+ struct pointer_set_t *pset;
basic_block bb;
block_stmt_iterator i;
- if (dfa_stats_p == NULL)
- abort ();
+ gcc_assert (dfa_stats_p);
memset ((void *)dfa_stats_p, 0, sizeof (struct dfa_stats_d));
/* Walk all the trees in the function counting references. Start at
- basic block 0, but don't stop at block boundaries. */
- htab = htab_create (30, htab_hash_pointer, htab_eq_pointer, NULL);
+ basic block NUM_FIXED_BLOCKS, but don't stop at block boundaries. */
+ pset = pointer_set_create ();
- for (i = bsi_start (BASIC_BLOCK (0)); !bsi_end_p (i); bsi_next (&i))
+ for (i = bsi_start (BASIC_BLOCK (NUM_FIXED_BLOCKS));
+ !bsi_end_p (i); bsi_next (&i))
walk_tree (bsi_stmt_ptr (i), collect_dfa_stats_r, (void *) dfa_stats_p,
- (void *) htab);
+ pset);
- htab_delete (htab);
+ pointer_set_destroy (pset);
FOR_EACH_BB (bb)
{
tree phi;
- for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
+ for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
{
dfa_stats_p->num_phis++;
dfa_stats_p->num_phi_args += PHI_NUM_ARGS (phi);
tree t = *tp;
struct dfa_stats_d *dfa_stats_p = (struct dfa_stats_d *)data;
- if (t->common.ann)
+ if (t->base.ann)
{
- switch (ann_type (t->common.ann))
+ switch (ann_type (t->base.ann))
{
case STMT_ANN:
{
- stmt_ann_t ann = (stmt_ann_t) t->common.ann;
dfa_stats_p->num_stmt_anns++;
- dfa_stats_p->num_defs += NUM_DEFS (DEF_OPS (ann));
- dfa_stats_p->num_uses += NUM_USES (USE_OPS (ann));
- dfa_stats_p->num_v_may_defs +=
- NUM_V_MAY_DEFS (V_MAY_DEF_OPS (ann));
- dfa_stats_p->num_vuses += NUM_VUSES (VUSE_OPS (ann));
- dfa_stats_p->num_v_must_defs +=
- NUM_V_MUST_DEFS (V_MUST_DEF_OPS (ann));
+ dfa_stats_p->num_defs += NUM_SSA_OPERANDS (t, SSA_OP_DEF);
+ dfa_stats_p->num_uses += NUM_SSA_OPERANDS (t, SSA_OP_USE);
+ dfa_stats_p->num_vdefs += NUM_SSA_OPERANDS (t, SSA_OP_VDEF);
+ dfa_stats_p->num_vuses += NUM_SSA_OPERANDS (t, SSA_OP_VUSE);
break;
}
the function. */
static tree
-find_vars_r (tree *tp, int *walk_subtrees, void *data)
+find_vars_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
{
- tree t = *tp;
- struct walk_state *walk_state = (struct walk_state *)data;
+ /* If T is a regular variable that the optimizers are interested
+ in, add it to the list of variables. */
+ if (SSA_VAR_P (*tp))
+ add_referenced_var (*tp);
- if (SSA_VAR_P (t))
- {
- /* If T is a regular variable that the optimizers are interested
- in, add it to the list of variables. */
- add_referenced_var (t, walk_state);
- }
- else if (DECL_P (t)
- || TYPE_P (t)
- || TREE_CODE_CLASS (TREE_CODE (t)) == 'c')
+ /* Type, _DECL and constant nodes have no interesting children.
+ Ignore them. */
+ else if (IS_TYPE_OR_DECL_P (*tp) || CONSTANT_CLASS_P (*tp))
+ *walk_subtrees = 0;
+
+ return NULL_TREE;
+}
+
+/* Lookup UID in the referenced_vars hashtable and return the associated
+ variable. */
+
+tree
+referenced_var_lookup (unsigned int uid)
+{
+ tree h;
+ struct tree_decl_minimal in;
+ in.uid = uid;
+ h = (tree) htab_find_with_hash (gimple_referenced_vars (cfun), &in, uid);
+ gcc_assert (h || uid == 0);
+ return h;
+}
+
+/* Check if TO is in the referenced_vars hash table and insert it if not.
+ Return true if it required insertion. */
+
+bool
+referenced_var_check_and_insert (tree to)
+{
+ tree h, *loc;
+ struct tree_decl_minimal in;
+ unsigned int uid = DECL_UID (to);
+
+ in.uid = uid;
+ h = (tree) htab_find_with_hash (gimple_referenced_vars (cfun), &in, uid);
+ if (h)
{
- /* Type, _DECL and constant nodes have no interesting children.
- Ignore them. */
- *walk_subtrees = 0;
+ /* DECL_UID has already been entered in the table. Verify that it is
+ the same entry as TO. See PR 27793. */
+ gcc_assert (h == to);
+ return false;
}
+ loc = (tree *) htab_find_slot_with_hash (gimple_referenced_vars (cfun),
+ &in, uid, INSERT);
+ *loc = to;
+ return true;
+}
- return NULL_TREE;
+/* Lookup VAR UID in the default_defs hashtable and return the associated
+ variable. */
+
+tree
+gimple_default_def (struct function *fn, tree var)
+{
+ struct tree_decl_minimal ind;
+ struct tree_ssa_name in;
+ gcc_assert (SSA_VAR_P (var));
+ in.var = (tree)&ind;
+ ind.uid = DECL_UID (var);
+ return (tree) htab_find_with_hash (DEFAULT_DEFS (fn), &in, DECL_UID (var));
}
+/* Insert the pair VAR's UID, DEF into the default_defs hashtable. */
-/* Add VAR to the list of dereferenced variables.
+void
+set_default_def (tree var, tree def)
+{
+ struct tree_decl_minimal ind;
+ struct tree_ssa_name in;
+ void **loc;
+
+ gcc_assert (SSA_VAR_P (var));
+ in.var = (tree)&ind;
+ ind.uid = DECL_UID (var);
+ if (!def)
+ {
+ loc = htab_find_slot_with_hash (DEFAULT_DEFS (cfun), &in,
+ DECL_UID (var), INSERT);
+ gcc_assert (*loc);
+ htab_remove_elt (DEFAULT_DEFS (cfun), *loc);
+ return;
+ }
+ gcc_assert (TREE_CODE (def) == SSA_NAME && SSA_NAME_VAR (def) == var);
+ loc = htab_find_slot_with_hash (DEFAULT_DEFS (cfun), &in,
+ DECL_UID (var), INSERT);
- WALK_STATE contains a hash table used to avoid adding the same
- variable more than once. Note that this function assumes that
- VAR is a valid SSA variable. If WALK_STATE is NULL, no
- duplicate checking is done. */
+ /* Default definition might be changed by tail call optimization. */
+ if (*loc)
+ SSA_NAME_IS_DEFAULT_DEF (*(tree *) loc) = false;
+ *(tree *) loc = def;
-static void
-add_referenced_var (tree var, struct walk_state *walk_state)
+ /* Mark DEF as the default definition for VAR. */
+ SSA_NAME_IS_DEFAULT_DEF (def) = true;
+}
+
+/* Add VAR to the list of referenced variables if it isn't already there. */
+
+void
+add_referenced_var (tree var)
{
- void **slot;
var_ann_t v_ann;
v_ann = get_var_ann (var);
-
- if (walk_state)
- slot = htab_find_slot (walk_state->vars_found, (void *) var, INSERT);
- else
- slot = NULL;
-
- if (slot == NULL || *slot == NULL)
+ gcc_assert (DECL_P (var));
+
+ /* Insert VAR into the referenced_vars has table if it isn't present. */
+ if (referenced_var_check_and_insert (var))
{
- /* This is the first time we find this variable, add it to the
- REFERENCED_VARS array and annotate it with attributes that are
- intrinsic to the variable. */
- if (slot)
- *slot = (void *) var;
- v_ann->uid = num_referenced_vars;
- VARRAY_PUSH_TREE (referenced_vars, var);
-
- /* Global and static variables are call-clobbered, always. */
- if (needs_to_live_in_memory (var))
- mark_call_clobbered (var);
-
- /* DECL_NONLOCAL variables should not be removed, as they are needed
- to emit nested functions. */
- if (DECL_NONLOCAL (var))
- v_ann->used = 1;
+ /* This is the first time we found this variable, annotate it with
+ attributes that are intrinsic to the variable. */
+
+ /* Tag's don't have DECL_INITIAL. */
+ if (MTAG_P (var))
+ return;
+
+ /* Scan DECL_INITIAL for pointer variables as they may contain
+ address arithmetic referencing the address of other
+ variables.
+ Even non-constant intializers need to be walked, because
+ IPA passes might prove that their are invariant later on. */
+ if (DECL_INITIAL (var)
+ /* Initializers of external variables are not useful to the
+ optimizers. */
+ && !DECL_EXTERNAL (var))
+ walk_tree (&DECL_INITIAL (var), find_vars_r, NULL, 0);
}
}
+/* Remove VAR from the list. */
+
+void
+remove_referenced_var (tree var)
+{
+ var_ann_t v_ann;
+ struct tree_decl_minimal in;
+ void **loc;
+ unsigned int uid = DECL_UID (var);
+
+ clear_call_clobbered (var);
+ v_ann = get_var_ann (var);
+ ggc_free (v_ann);
+ var->base.ann = NULL;
+ gcc_assert (DECL_P (var));
+ in.uid = uid;
+ loc = htab_find_slot_with_hash (gimple_referenced_vars (cfun), &in, uid,
+ NO_INSERT);
+ htab_clear_slot (gimple_referenced_vars (cfun), loc);
+}
+
/* Return the virtual variable associated to the non-scalar variable VAR. */
tree
get_virtual_var (tree var)
{
- enum tree_code code;
-
STRIP_NOPS (var);
if (TREE_CODE (var) == SSA_NAME)
var = SSA_NAME_VAR (var);
- code = TREE_CODE (var);
-
- while (code == ARRAY_REF
- || code == COMPONENT_REF
- || code == REALPART_EXPR
- || code == IMAGPART_EXPR)
- {
- var = TREE_OPERAND (var, 0);
- code = TREE_CODE (var);
- }
+ while (TREE_CODE (var) == REALPART_EXPR || TREE_CODE (var) == IMAGPART_EXPR
+ || handled_component_p (var))
+ var = TREE_OPERAND (var, 0);
-#ifdef ENABLE_CHECKING
/* Treating GIMPLE registers as virtual variables makes no sense.
Also complain if we couldn't extract a _DECL out of the original
expression. */
- if (!SSA_VAR_P (var)
- || is_gimple_reg (var))
- abort ();
-#endif
+ gcc_assert (SSA_VAR_P (var));
+ gcc_assert (!is_gimple_reg (var));
return var;
}
+/* Mark all the naked symbols in STMT for SSA renaming.
+
+ NOTE: This function should only be used for brand new statements.
+ If the caller is modifying an existing statement, it should use the
+ combination push_stmt_changes/pop_stmt_changes. */
-/* Mark variables in BLOCK that have hidden uses. A hidden use can
- occur due to VLA declarations or nested functions. */
-
-static void
-find_hidden_use_vars (tree block)
+void
+mark_symbols_for_renaming (tree stmt)
{
- tree sub, decl, tem;
-
- /* Check all the arrays declared in the block for VLAs.
- While scanning the block's variables, also see if there is
- a nested function at this scope. */
- for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl))
- {
- int inside_vla = 0;
- walk_tree (&decl, find_hidden_use_vars_r, &inside_vla, NULL);
- }
-
- /* Now repeat the search in any sub-blocks. */
- for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub))
- find_hidden_use_vars (sub);
+ tree op;
+ ssa_op_iter iter;
- /* A VLA parameter may use a variable which as set from another
- parameter to declare the size of the VLA. We need to mark the
- variable as having a hidden use since it is used to declare the
- VLA parameter and that declaration is not seen by the SSA code.
+ update_stmt (stmt);
- Note get_pending_sizes clears the PENDING_SIZES chain, so we
- must restore it. */
- tem = get_pending_sizes ();
- put_pending_sizes (tem);
- for (; tem; tem = TREE_CHAIN (tem))
- {
- int inside_vla = 1;
- walk_tree (&TREE_VALUE (tem), find_hidden_use_vars_r, &inside_vla, NULL);
- }
+ /* Mark all the operands for renaming. */
+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_ALL_OPERANDS)
+ if (DECL_P (op))
+ mark_sym_for_renaming (op);
}
-/* Callback for walk_tree used by find_hidden_use_vars to analyze each
- variable in a lexical block. If the variable's size has a variable
- size, then mark all objects needed to compute the variable's size
- as having hidden uses. */
+/* Find all variables within the gimplified statement that were not previously
+ visible to the function and add them to the referenced variables list. */
static tree
-find_hidden_use_vars_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED)
+find_new_referenced_vars_1 (tree *tp, int *walk_subtrees,
+ void *data ATTRIBUTE_UNUSED)
{
- int *inside_vla = (int *) data;
-
- /* We need to look for hidden uses due to VLAs in variable
- definitions. We originally used to look for these hidden
- uses in the variable's type, but that's unreliable if the
- type's size contains a SAVE_EXPR for a different function
- context than the variable is used within. */
- if (SSA_VAR_P (*tp)
- && ((DECL_SIZE (*tp)
- && ! really_constant_p (DECL_SIZE (*tp)))
- || (DECL_SIZE_UNIT (*tp)
- && ! really_constant_p (DECL_SIZE_UNIT (*tp)))))
- {
- int save = *inside_vla;
+ tree t = *tp;
- *inside_vla = 1;
- walk_tree (&DECL_SIZE (*tp), find_hidden_use_vars_r, inside_vla, NULL);
- walk_tree (&DECL_SIZE_UNIT (*tp), find_hidden_use_vars_r,
- inside_vla, NULL);
- *inside_vla = save;
+ if (TREE_CODE (t) == VAR_DECL && !var_ann (t))
+ {
+ add_referenced_var (t);
+ mark_sym_for_renaming (t);
}
- else if (*inside_vla && SSA_VAR_P (*tp))
- set_has_hidden_use (*tp);
- return NULL_TREE;
-}
+ if (IS_TYPE_OR_DECL_P (t))
+ *walk_subtrees = 0;
-
-/* Add a temporary variable to REFERENCED_VARS. This is similar to
- add_referenced_var, but is used by passes that need to add new temps to
- the REFERENCED_VARS array after the program has been scanned for
- variables. The variable will just receive a new UID and be added
- to the REFERENCED_VARS array without checking for duplicates. */
+ return NULL;
+}
void
-add_referenced_tmp_var (tree var)
+find_new_referenced_vars (tree *stmt_p)
{
- add_referenced_var (var, NULL);
+ walk_tree (stmt_p, find_new_referenced_vars_1, NULL, NULL);
}
-/* Return true if V_MAY_DEFS_AFTER contains fewer entries than
- V_MAY_DEFS_BEFORE. Note that this assumes that both varrays
- are V_MAY_DEF operands for the same statement. */
-static inline bool
-v_may_defs_disappeared_p (v_may_def_optype v_may_defs_before,
- v_may_def_optype v_may_defs_after)
+/* If EXP is a handled component reference for a structure, return the
+ base variable. The access range is delimited by bit positions *POFFSET and
+ *POFFSET + *PMAX_SIZE. The access size is *PSIZE bits. If either
+ *PSIZE or *PMAX_SIZE is -1, they could not be determined. If *PSIZE
+ and *PMAX_SIZE are equal, the access is non-variable. */
+
+tree
+get_ref_base_and_extent (tree exp, HOST_WIDE_INT *poffset,
+ HOST_WIDE_INT *psize,
+ HOST_WIDE_INT *pmax_size)
{
- /* If there was nothing before, nothing could've disappeared. */
- if (v_may_defs_before == NULL)
- return false;
-
- /* All/some of them gone. */
- if (v_may_defs_after == NULL
- || NUM_V_MAY_DEFS (v_may_defs_before) >
- NUM_V_MAY_DEFS (v_may_defs_after))
- return true;
-
- return false;
-}
+ HOST_WIDE_INT bitsize = -1;
+ HOST_WIDE_INT maxsize = -1;
+ tree size_tree = NULL_TREE;
+ HOST_WIDE_INT bit_offset = 0;
+ bool seen_variable_array_ref = false;
+
+ gcc_assert (!SSA_VAR_P (exp));
+
+ /* First get the final access size from just the outermost expression. */
+ if (TREE_CODE (exp) == COMPONENT_REF)
+ size_tree = DECL_SIZE (TREE_OPERAND (exp, 1));
+ else if (TREE_CODE (exp) == BIT_FIELD_REF)
+ size_tree = TREE_OPERAND (exp, 1);
+ else
+ {
+ enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
+ if (mode == BLKmode)
+ size_tree = TYPE_SIZE (TREE_TYPE (exp));
+ else
+ bitsize = GET_MODE_BITSIZE (mode);
+ }
+ if (size_tree != NULL_TREE)
+ {
+ if (! host_integerp (size_tree, 1))
+ bitsize = -1;
+ else
+ bitsize = TREE_INT_CST_LOW (size_tree);
+ }
-/* Return true if V_MUST_DEFS_AFTER contains fewer entries than
- V_MUST_DEFS_BEFORE. Note that this assumes that both varrays
- are V_MUST_DEF operands for the same statement. */
+ /* Initially, maxsize is the same as the accessed element size.
+ In the following it will only grow (or become -1). */
+ maxsize = bitsize;
-static inline bool
-v_must_defs_disappeared_p (v_must_def_optype v_must_defs_before,
- v_must_def_optype v_must_defs_after)
-{
- /* If there was nothing before, nothing could've disappeared. */
- if (v_must_defs_before == NULL)
- return false;
-
- /* All/some of them gone. */
- if (v_must_defs_after == NULL
- || NUM_V_MUST_DEFS (v_must_defs_before) >
- NUM_V_MUST_DEFS (v_must_defs_after))
- return true;
-
- return false;
-}
+ /* Compute cumulative bit-offset for nested component-refs and array-refs,
+ and find the ultimate containing object. */
+ while (1)
+ {
+ switch (TREE_CODE (exp))
+ {
+ case BIT_FIELD_REF:
+ bit_offset += tree_low_cst (TREE_OPERAND (exp, 2), 0);
+ break;
+ case COMPONENT_REF:
+ {
+ tree field = TREE_OPERAND (exp, 1);
+ tree this_offset = component_ref_field_offset (exp);
+
+ if (this_offset && TREE_CODE (this_offset) == INTEGER_CST)
+ {
+ HOST_WIDE_INT hthis_offset = tree_low_cst (this_offset, 0);
+
+ hthis_offset *= BITS_PER_UNIT;
+ bit_offset += hthis_offset;
+ bit_offset += tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 0);
+ }
+ else
+ {
+ tree csize = TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0)));
+ /* We need to adjust maxsize to the whole structure bitsize.
+ But we can subtract any constant offset seen sofar,
+ because that would get us out of the structure otherwise. */
+ if (maxsize != -1 && csize && host_integerp (csize, 1))
+ maxsize = TREE_INT_CST_LOW (csize) - bit_offset;
+ else
+ maxsize = -1;
+ }
+ }
+ break;
-/* Add all the non-SSA variables found in STMT's operands to the bitmap
- VARS_TO_RENAME. */
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ {
+ tree index = TREE_OPERAND (exp, 1);
+ tree low_bound = array_ref_low_bound (exp);
+ tree unit_size = array_ref_element_size (exp);
+
+ /* If the resulting bit-offset is constant, track it. */
+ if (host_integerp (index, 0)
+ && host_integerp (low_bound, 0)
+ && host_integerp (unit_size, 1))
+ {
+ HOST_WIDE_INT hindex = tree_low_cst (index, 0);
+
+ hindex -= tree_low_cst (low_bound, 0);
+ hindex *= tree_low_cst (unit_size, 1);
+ hindex *= BITS_PER_UNIT;
+ bit_offset += hindex;
+
+ /* An array ref with a constant index up in the structure
+ hierarchy will constrain the size of any variable array ref
+ lower in the access hierarchy. */
+ seen_variable_array_ref = false;
+ }
+ else
+ {
+ tree asize = TYPE_SIZE (TREE_TYPE (TREE_OPERAND (exp, 0)));
+ /* We need to adjust maxsize to the whole array bitsize.
+ But we can subtract any constant offset seen sofar,
+ because that would get us outside of the array otherwise. */
+ if (maxsize != -1 && asize && host_integerp (asize, 1))
+ maxsize = TREE_INT_CST_LOW (asize) - bit_offset;
+ else
+ maxsize = -1;
+
+ /* Remember that we have seen an array ref with a variable
+ index. */
+ seen_variable_array_ref = true;
+ }
+ }
+ break;
-void
-mark_new_vars_to_rename (tree stmt, bitmap vars_to_rename)
-{
- def_optype defs;
- use_optype uses;
- v_may_def_optype v_may_defs;
- vuse_optype vuses;
- v_must_def_optype v_must_defs;
- size_t i;
- bitmap vars_in_vops_to_rename;
- bool found_exposed_symbol = false;
- v_may_def_optype v_may_defs_before, v_may_defs_after;
- v_must_def_optype v_must_defs_before, v_must_defs_after;
- stmt_ann_t ann;
+ case REALPART_EXPR:
+ break;
- vars_in_vops_to_rename = BITMAP_XMALLOC ();
+ case IMAGPART_EXPR:
+ bit_offset += bitsize;
+ break;
- /* Before re-scanning the statement for operands, mark the existing
- virtual operands to be renamed again. We do this because when new
- symbols are exposed, the virtual operands that were here before due to
- aliasing will probably be removed by the call to get_stmt_operand.
- Therefore, we need to flag them to be renamed beforehand.
+ case VIEW_CONVERT_EXPR:
+ /* ??? We probably should give up here and bail out. */
+ break;
- We flag them in a separate bitmap because we don't really want to
- rename them if there are not any newly exposed symbols in the
- statement operands. */
- ann = stmt_ann (stmt);
- v_may_defs_before = v_may_defs = V_MAY_DEF_OPS (ann);
- for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
- {
- tree var = V_MAY_DEF_RESULT (v_may_defs, i);
- if (!DECL_P (var))
- var = SSA_NAME_VAR (var);
- bitmap_set_bit (vars_in_vops_to_rename, var_ann (var)->uid);
- }
+ default:
+ goto done;
+ }
- vuses = VUSE_OPS (ann);
- for (i = 0; i < NUM_VUSES (vuses); i++)
- {
- tree var = VUSE_OP (vuses, i);
- if (!DECL_P (var))
- var = SSA_NAME_VAR (var);
- bitmap_set_bit (vars_in_vops_to_rename, var_ann (var)->uid);
+ exp = TREE_OPERAND (exp, 0);
}
+ done:
+
+ /* We need to deal with variable arrays ending structures such as
+ struct { int length; int a[1]; } x; x.a[d]
+ struct { struct { int a; int b; } a[1]; } x; x.a[d].a
+ struct { struct { int a[1]; } a[1]; } x; x.a[0][d], x.a[d][0]
+ where we do not know maxsize for variable index accesses to
+ the array. The simplest way to conservatively deal with this
+ is to punt in the case that offset + maxsize reaches the
+ base type boundary. */
+ if (seen_variable_array_ref
+ && maxsize != -1
+ && host_integerp (TYPE_SIZE (TREE_TYPE (exp)), 1)
+ && bit_offset + maxsize
+ == (signed)TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))))
+ maxsize = -1;
+
+ /* ??? Due to negative offsets in ARRAY_REF we can end up with
+ negative bit_offset here. We might want to store a zero offset
+ in this case. */
+ *poffset = bit_offset;
+ *psize = bitsize;
+ *pmax_size = maxsize;
+
+ return exp;
+}
- v_must_defs_before = v_must_defs = V_MUST_DEF_OPS (ann);
- for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++)
- {
- tree var = V_MUST_DEF_OP (v_must_defs, i);
- if (!DECL_P (var))
- var = SSA_NAME_VAR (var);
- bitmap_set_bit (vars_in_vops_to_rename, var_ann (var)->uid);
- }
- /* Now force an operand re-scan on the statement and mark any newly
- exposed variables. */
- modify_stmt (stmt);
- get_stmt_operands (stmt);
+/* Return memory reference statistics for variable VAR in function FN.
+ This is computed by alias analysis, but it is not kept
+ incrementally up-to-date. So, these stats are only accurate if
+ pass_may_alias has been run recently. If no alias information
+ exists, this function returns NULL. */
- defs = DEF_OPS (ann);
- for (i = 0; i < NUM_DEFS (defs); i++)
- {
- tree var = DEF_OP (defs, i);
- if (DECL_P (var))
- {
- found_exposed_symbol = true;
- bitmap_set_bit (vars_to_rename, var_ann (var)->uid);
- }
- }
+mem_sym_stats_t
+mem_sym_stats (struct function *fn, tree var)
+{
+ void **slot;
+ struct pointer_map_t *stats_map = gimple_mem_ref_stats (fn)->mem_sym_stats;
- uses = USE_OPS (ann);
- for (i = 0; i < NUM_USES (uses); i++)
- {
- tree var = USE_OP (uses, i);
- if (DECL_P (var))
- {
- found_exposed_symbol = true;
- bitmap_set_bit (vars_to_rename, var_ann (var)->uid);
- }
- }
+ if (stats_map == NULL)
+ return NULL;
- v_may_defs_after = v_may_defs = V_MAY_DEF_OPS (ann);
- for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
- {
- tree var = V_MAY_DEF_RESULT (v_may_defs, i);
- if (DECL_P (var))
- {
- found_exposed_symbol = true;
- bitmap_set_bit (vars_to_rename, var_ann (var)->uid);
- }
- }
+ slot = pointer_map_contains (stats_map, var);
+ if (slot == NULL)
+ return NULL;
- vuses = VUSE_OPS (ann);
- for (i = 0; i < NUM_VUSES (vuses); i++)
- {
- tree var = VUSE_OP (vuses, i);
- if (DECL_P (var))
- {
- found_exposed_symbol = true;
- bitmap_set_bit (vars_to_rename, var_ann (var)->uid);
- }
- }
-
- v_must_defs_after = v_must_defs = V_MUST_DEF_OPS (ann);
- for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++)
- {
- tree var = V_MUST_DEF_OP (v_must_defs, i);
- if (DECL_P (var))
- {
- found_exposed_symbol = true;
- bitmap_set_bit (vars_to_rename, var_ann (var)->uid);
- }
- }
-
- /* If we found any newly exposed symbols, or if there are fewer VDEF
- operands in the statement, add the variables we had set in
- VARS_IN_VOPS_TO_RENAME to VARS_TO_RENAME. We need to check for
- vanishing VDEFs because in those cases, the names that were formerly
- generated by this statement are not going to be available anymore. */
- if (found_exposed_symbol
- || v_may_defs_disappeared_p (v_may_defs_before, v_may_defs_after)
- || v_must_defs_disappeared_p (v_must_defs_before, v_must_defs_after))
- bitmap_a_or_b (vars_to_rename, vars_to_rename, vars_in_vops_to_rename);
-
- BITMAP_XFREE (vars_in_vops_to_rename);
+ return (mem_sym_stats_t) *slot;
}