/* Data flow functions for trees.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
This file is part of GCC.
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
-#include "hashtab.h"
-#include "pointer-set.h"
+#include "backend.h"
+#include "rtl.h"
#include "tree.h"
-#include "tm_p.h"
-#include "basic-block.h"
-#include "output.h"
-#include "timevar.h"
-#include "ggc.h"
-#include "langhooks.h"
-#include "flags.h"
-#include "function.h"
-#include "tree-pretty-print.h"
-#include "tree-dump.h"
#include "gimple.h"
-#include "tree-flow.h"
-#include "tree-inline.h"
#include "tree-pass.h"
-#include "convert.h"
-#include "params.h"
-#include "cgraph.h"
+#include "ssa.h"
+#include "tree-pretty-print.h"
+#include "fold-const.h"
+#include "stor-layout.h"
+#include "langhooks.h"
+#include "gimple-iterator.h"
+#include "gimple-walk.h"
+#include "tree-dfa.h"
/* Build and maintain data flow information for trees. */
/* Counters used to display DFA and SSA statistics. */
struct dfa_stats_d
{
- long num_var_anns;
long num_defs;
long num_uses;
long num_phis;
/* Local functions. */
static void collect_dfa_stats (struct dfa_stats_d *);
-static tree find_vars_r (tree *, int *, void *);
/*---------------------------------------------------------------------------
Dataflow analysis (DFA) routines
---------------------------------------------------------------------------*/
-/* Find all the variables referenced in the function. This function
- builds the global arrays REFERENCED_VARS and CALL_CLOBBERED_VARS.
-
- Note that this function does not look for statement operands, it simply
- determines what variables are referenced in the program and detects
- various attributes for each variable used by alias analysis and the
- optimizer. */
-
-static unsigned int
-find_referenced_vars (void)
-{
- basic_block bb;
- gimple_stmt_iterator si;
-
- FOR_EACH_BB (bb)
- {
- for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
- {
- gimple stmt = gsi_stmt (si);
- if (is_gimple_debug (stmt))
- continue;
- find_referenced_vars_in (gsi_stmt (si));
- }
-
- for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
- find_referenced_vars_in (gsi_stmt (si));
- }
-
- return 0;
-}
-
-struct gimple_opt_pass pass_referenced_vars =
-{
- {
- GIMPLE_PASS,
- "*referenced_vars", /* name */
- NULL, /* gate */
- find_referenced_vars, /* execute */
- NULL, /* sub */
- NULL, /* next */
- 0, /* static_pass_number */
- 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 */
- }
-};
-
-
-/*---------------------------------------------------------------------------
- Manage annotations
----------------------------------------------------------------------------*/
-/* Create a new annotation for a _DECL node T. */
-
-var_ann_t
-create_var_ann (tree t)
-{
- var_ann_t ann;
-
- gcc_assert (t);
- gcc_assert (TREE_CODE (t) == VAR_DECL
- || TREE_CODE (t) == PARM_DECL
- || TREE_CODE (t) == RESULT_DECL);
-
- ann = ggc_alloc_cleared_var_ann_d ();
- *DECL_VAR_ANN_PTR (t) = ann;
-
- return ann;
-}
/* Renumber all of the gimple stmt uids. */
basic_block bb;
set_gimple_stmt_max_uid (cfun, 0);
- FOR_ALL_BB (bb)
+ FOR_ALL_BB_FN (bb, cfun)
{
gimple_stmt_iterator bsi;
for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
{
- gimple stmt = gsi_stmt (bsi);
+ gimple *stmt = gsi_stmt (bsi);
gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
}
for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
{
- gimple stmt = gsi_stmt (bsi);
+ gimple *stmt = gsi_stmt (bsi);
gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
}
}
gimple_stmt_iterator bsi;
for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
{
- gimple stmt = gsi_stmt (bsi);
+ gimple *stmt = gsi_stmt (bsi);
gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
}
for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
{
- gimple stmt = gsi_stmt (bsi);
+ gimple *stmt = gsi_stmt (bsi);
gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
}
}
}
-/* Build a temporary. Make sure and register it to be renamed. */
-
-tree
-make_rename_temp (tree type, const char *prefix)
-{
- tree t = create_tmp_reg (type, prefix);
-
- if (gimple_referenced_vars (cfun))
- add_referenced_var (t);
- if (gimple_in_ssa_p (cfun))
- mark_sym_for_renaming (t);
-
- return t;
-}
-
/*---------------------------------------------------------------------------
Debugging functions
---------------------------------------------------------------------------*/
-/* Dump the list of all the referenced variables in the current function to
- FILE. */
-
-void
-dump_referenced_vars (FILE *file)
-{
- 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_EACH_REFERENCED_VAR (cfun, var, rvi)
- {
- fprintf (file, "Variable: ");
- dump_variable (file, var);
- }
-
- fprintf (file, "\n");
-}
-
-
-/* Dump the list of all the referenced variables to stderr. */
-
-DEBUG_FUNCTION void
-debug_referenced_vars (void)
-{
- dump_referenced_vars (stderr);
-}
-
/* Dump variable VAR and its may-aliases to FILE. */
if (TREE_THIS_VOLATILE (var))
fprintf (file, ", is volatile");
- if (cfun && gimple_default_def (cfun, var))
+ if (cfun && ssa_default_def (cfun, var))
{
fprintf (file, ", default def: ");
- print_generic_expr (file, gimple_default_def (cfun, var), dump_flags);
+ print_generic_expr (file, ssa_default_def (cfun, var), dump_flags);
}
if (DECL_INITIAL (var))
unsigned long size, total = 0;
const char * const fmt_str = "%-30s%-13s%12s\n";
- const char * const fmt_str_1 = "%-30s%13lu%11lu%c\n";
- const char * const fmt_str_3 = "%-43s%11lu%c\n";
+ const char * const fmt_str_1 = "%-30s%13lu" PRsa (11) "\n";
+ const char * const fmt_str_3 = "%-43s" PRsa (11) "\n";
const char *funcname
= lang_hooks.decl_printable_name (current_function_decl, 2);
fprintf (file, fmt_str, "", " instances ", "used ");
fprintf (file, "---------------------------------------------------------\n");
- size = num_referenced_vars * sizeof (tree);
- total += size;
- fprintf (file, fmt_str_1, "Referenced variables", (unsigned long)num_referenced_vars,
- SCALE (size), LABEL (size));
-
- size = dfa_stats.num_var_anns * sizeof (struct var_ann_d);
- total += size;
- fprintf (file, fmt_str_1, "Variables annotated", dfa_stats.num_var_anns,
- SCALE (size), LABEL (size));
-
size = dfa_stats.num_uses * sizeof (tree *);
total += size;
fprintf (file, fmt_str_1, "USE operands", dfa_stats.num_uses,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
size = dfa_stats.num_defs * sizeof (tree *);
total += size;
fprintf (file, fmt_str_1, "DEF operands", dfa_stats.num_defs,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
size = dfa_stats.num_vuses * sizeof (tree *);
total += size;
fprintf (file, fmt_str_1, "VUSE operands", dfa_stats.num_vuses,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
size = dfa_stats.num_vdefs * sizeof (tree *);
total += size;
fprintf (file, fmt_str_1, "VDEF operands", dfa_stats.num_vdefs,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
- size = dfa_stats.num_phis * sizeof (struct gimple_statement_phi);
+ size = dfa_stats.num_phis * sizeof (struct gphi);
total += size;
fprintf (file, fmt_str_1, "PHI nodes", dfa_stats.num_phis,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
size = dfa_stats.num_phi_args * sizeof (struct phi_arg_d);
total += size;
fprintf (file, fmt_str_1, "PHI arguments", dfa_stats.num_phi_args,
- SCALE (size), LABEL (size));
+ SIZE_AMOUNT (size));
fprintf (file, "---------------------------------------------------------\n");
- fprintf (file, fmt_str_3, "Total memory used by DFA/SSA data", SCALE (total),
- LABEL (total));
+ fprintf (file, fmt_str_3, "Total memory used by DFA/SSA data",
+ SIZE_AMOUNT (total));
fprintf (file, "---------------------------------------------------------\n");
fprintf (file, "\n");
collect_dfa_stats (struct dfa_stats_d *dfa_stats_p ATTRIBUTE_UNUSED)
{
basic_block bb;
- referenced_var_iterator vi;
- tree var;
gcc_assert (dfa_stats_p);
memset ((void *)dfa_stats_p, 0, sizeof (struct dfa_stats_d));
- /* Count all the variable annotations. */
- FOR_EACH_REFERENCED_VAR (cfun, var, vi)
- if (var_ann (var))
- dfa_stats_p->num_var_anns++;
-
/* Walk all the statements in the function counting references. */
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
- gimple_stmt_iterator si;
-
- for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
+ for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si);
+ gsi_next (&si))
{
- gimple phi = gsi_stmt (si);
+ gphi *phi = si.phi ();
dfa_stats_p->num_phis++;
dfa_stats_p->num_phi_args += gimple_phi_num_args (phi);
if (gimple_phi_num_args (phi) > dfa_stats_p->max_num_phi_args)
dfa_stats_p->max_num_phi_args = gimple_phi_num_args (phi);
}
- for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
+ for (gimple_stmt_iterator si = gsi_start_bb (bb); !gsi_end_p (si);
+ gsi_next (&si))
{
- gimple stmt = gsi_stmt (si);
+ gimple *stmt = gsi_stmt (si);
dfa_stats_p->num_defs += NUM_SSA_OPERANDS (stmt, SSA_OP_DEF);
dfa_stats_p->num_uses += NUM_SSA_OPERANDS (stmt, SSA_OP_USE);
dfa_stats_p->num_vdefs += gimple_vdef (stmt) ? 1 : 0;
/*---------------------------------------------------------------------------
Miscellaneous helpers
---------------------------------------------------------------------------*/
-/* Callback for walk_tree. Used to collect variables referenced in
- the function. */
-
-static tree
-find_vars_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
-{
- /* If we are reading the lto info back in, we need to rescan the
- referenced vars. */
- if (TREE_CODE (*tp) == SSA_NAME)
- add_referenced_var (SSA_NAME_VAR (*tp));
-
- /* If T is a regular variable that the optimizers are interested
- in, add it to the list of variables. */
- else if (SSA_VAR_P (*tp))
- add_referenced_var (*tp);
-
- /* 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;
-}
-
-/* Find referenced variables in STMT. */
-
-void
-find_referenced_vars_in (gimple stmt)
-{
- size_t i;
-
- if (gimple_code (stmt) != GIMPLE_PHI)
- {
- for (i = 0; i < gimple_num_ops (stmt); i++)
- walk_tree (gimple_op_ptr (stmt, i), find_vars_r, NULL, NULL);
- }
- else
- {
- walk_tree (gimple_phi_result_ptr (stmt), find_vars_r, NULL, NULL);
-
- for (i = 0; i < gimple_phi_num_args (stmt); i++)
- {
- tree arg = gimple_phi_arg_def (stmt, i);
- walk_tree (&arg, find_vars_r, NULL, NULL);
- }
- }
-}
-
-
-/* Lookup UID in the referenced_vars hashtable and return the associated
- variable. */
-
-tree
-referenced_var_lookup (struct function *fn, unsigned int uid)
-{
- tree h;
- struct tree_decl_minimal in;
- in.uid = uid;
- h = (tree) htab_find_with_hash (gimple_referenced_vars (fn), &in, uid);
- return h;
-}
-
-/* Check if TO is in the referenced_vars hash table and insert it if not.
- Return true if it required insertion. */
-
-static 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)
- {
- /* 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;
-}
/* Lookup VAR UID in the default_defs hashtable and return the associated
variable. */
tree
-gimple_default_def (struct function *fn, tree var)
+ssa_default_def (struct function *fn, tree var)
{
struct tree_decl_minimal ind;
struct tree_ssa_name in;
- gcc_assert (SSA_VAR_P (var));
+ gcc_assert (VAR_P (var)
+ || TREE_CODE (var) == PARM_DECL
+ || TREE_CODE (var) == RESULT_DECL);
+
+ /* Always NULL_TREE for rtl function dumps. */
+ if (!fn->gimple_df)
+ return NULL_TREE;
+
in.var = (tree)&ind;
ind.uid = DECL_UID (var);
- return (tree) htab_find_with_hash (DEFAULT_DEFS (fn), &in, DECL_UID (var));
+ return DEFAULT_DEFS (fn)->find_with_hash ((tree)&in, DECL_UID (var));
}
-/* Insert the pair VAR's UID, DEF into the default_defs hashtable. */
+/* Insert the pair VAR's UID, DEF into the default_defs hashtable
+ of function FN. */
void
-set_default_def (tree var, tree def)
+set_ssa_default_def (struct function *fn, tree var, tree def)
{
struct tree_decl_minimal ind;
struct tree_ssa_name in;
- void **loc;
- gcc_assert (SSA_VAR_P (var));
+ gcc_assert (VAR_P (var)
+ || TREE_CODE (var) == PARM_DECL
+ || TREE_CODE (var) == RESULT_DECL);
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);
+ tree *loc = DEFAULT_DEFS (fn)->find_slot_with_hash ((tree)&in,
+ DECL_UID (var),
+ NO_INSERT);
+ if (loc)
+ {
+ SSA_NAME_IS_DEFAULT_DEF (*(tree *)loc) = false;
+ DEFAULT_DEFS (fn)->clear_slot (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);
+ tree *loc = DEFAULT_DEFS (fn)->find_slot_with_hash ((tree)&in,
+ DECL_UID (var), INSERT);
/* Default definition might be changed by tail call optimization. */
if (*loc)
- SSA_NAME_IS_DEFAULT_DEF (*(tree *) loc) = false;
- *(tree *) loc = def;
+ SSA_NAME_IS_DEFAULT_DEF (*loc) = false;
/* 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. */
-
-bool
-add_referenced_var (tree var)
-{
- gcc_assert (DECL_P (var));
- if (!*DECL_VAR_ANN_PTR (var))
- create_var_ann (var);
-
- /* Insert VAR into the referenced_vars hash table if it isn't present. */
- if (referenced_var_check_and_insert (var))
- {
- /* Scan DECL_INITIAL for pointer variables as they may contain
- address arithmetic referencing the address of other
- variables. As we are only interested in directly referenced
- globals or referenced locals restrict this to initializers
- than can refer to local variables. */
- if (DECL_INITIAL (var)
- && DECL_CONTEXT (var) == current_function_decl)
- walk_tree (&DECL_INITIAL (var), find_vars_r, NULL, 0);
-
- return true;
- }
-
- return false;
+ *loc = def;
+ SSA_NAME_IS_DEFAULT_DEF (def) = true;
}
-/* Remove VAR from the list. */
+/* Retrieve or create a default definition for VAR. */
-void
-remove_referenced_var (tree var)
+tree
+get_or_create_ssa_default_def (struct function *fn, tree var)
{
- var_ann_t v_ann;
- struct tree_decl_minimal in;
- void **loc;
- unsigned int uid = DECL_UID (var);
-
- /* Preserve var_anns of globals. */
- if (!is_global_var (var)
- && (v_ann = var_ann (var)))
+ tree ddef = ssa_default_def (fn, var);
+ if (ddef == NULL_TREE)
{
- ggc_free (v_ann);
- *DECL_VAR_ANN_PTR (var) = NULL;
+ ddef = make_ssa_name_fn (fn, var, gimple_build_nop ());
+ set_ssa_default_def (fn, var, ddef);
}
- 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 ddef;
}
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. */
+ and *PMAX_SIZE are equal, the access is non-variable. If *PREVERSE is
+ true, the storage order of the reference is reversed. */
tree
-get_ref_base_and_extent (tree exp, HOST_WIDE_INT *poffset,
- HOST_WIDE_INT *psize,
- HOST_WIDE_INT *pmax_size)
+get_ref_base_and_extent (tree exp, poly_int64_pod *poffset,
+ poly_int64_pod *psize,
+ poly_int64_pod *pmax_size,
+ bool *preverse)
{
- HOST_WIDE_INT bitsize = -1;
- HOST_WIDE_INT maxsize = -1;
+ poly_offset_int bitsize = -1;
+ poly_offset_int maxsize;
tree size_tree = NULL_TREE;
- HOST_WIDE_INT bit_offset = 0;
+ poly_offset_int bit_offset = 0;
bool seen_variable_array_ref = false;
- tree base_type;
- /* First get the final access size from just the outermost expression. */
+ /* First get the final access size and the storage order 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 if (!VOID_TYPE_P (TREE_TYPE (exp)))
{
- enum machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
+ 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);
- }
+ if (size_tree != NULL_TREE
+ && poly_int_tree_p (size_tree))
+ bitsize = wi::to_poly_offset (size_tree);
+
+ *preverse = reverse_storage_order_for_component_p (exp);
/* Initially, maxsize is the same as the accessed element size.
In the following it will only grow (or become -1). */
and find the ultimate containing object. */
while (1)
{
- base_type = TREE_TYPE (exp);
-
switch (TREE_CODE (exp))
{
case BIT_FIELD_REF:
- bit_offset += TREE_INT_CST_LOW (TREE_OPERAND (exp, 2));
+ bit_offset += wi::to_poly_offset (TREE_OPERAND (exp, 2));
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_integerp (this_offset, 0))
+ if (this_offset && poly_int_tree_p (this_offset))
{
- HOST_WIDE_INT hthis_offset = TREE_INT_CST_LOW (this_offset);
- hthis_offset *= BITS_PER_UNIT;
- hthis_offset
- += TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field));
- bit_offset += hthis_offset;
+ poly_offset_int woffset = (wi::to_poly_offset (this_offset)
+ << LOG2_BITS_PER_UNIT);
+ woffset += wi::to_offset (DECL_FIELD_BIT_OFFSET (field));
+ bit_offset += woffset;
/* If we had seen a variable array ref already and we just
referenced the last field of a struct or a union member
then we have to adjust maxsize by the padding at the end
of our field. */
- if (seen_variable_array_ref
- && maxsize != -1)
+ if (seen_variable_array_ref)
{
tree stype = TREE_TYPE (TREE_OPERAND (exp, 0));
tree next = DECL_CHAIN (field);
{
tree fsize = DECL_SIZE_UNIT (field);
tree ssize = TYPE_SIZE_UNIT (stype);
- if (host_integerp (fsize, 0)
- && host_integerp (ssize, 0))
- maxsize += ((TREE_INT_CST_LOW (ssize)
- - TREE_INT_CST_LOW (fsize))
- * BITS_PER_UNIT - hthis_offset);
- else
+ if (fsize == NULL
+ || !poly_int_tree_p (fsize)
+ || ssize == NULL
+ || !poly_int_tree_p (ssize))
maxsize = -1;
+ else if (known_size_p (maxsize))
+ {
+ poly_offset_int tem
+ = (wi::to_poly_offset (ssize)
+ - wi::to_poly_offset (fsize));
+ tem <<= LOG2_BITS_PER_UNIT;
+ tem -= woffset;
+ maxsize += tem;
+ }
}
+ /* An component ref with an adjacent field up in the
+ structure hierarchy constrains the size of any variable
+ array ref lower in the access hierarchy. */
+ else
+ seen_variable_array_ref = false;
}
}
else
/* We need to adjust maxsize to the whole structure bitsize.
But we can subtract any constant offset seen so far,
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;
+ if (known_size_p (maxsize)
+ && csize
+ && poly_int_tree_p (csize))
+ maxsize = wi::to_poly_offset (csize) - bit_offset;
else
maxsize = -1;
}
{
tree index = TREE_OPERAND (exp, 1);
tree low_bound, unit_size;
- double_int doffset;
/* If the resulting bit-offset is constant, track it. */
- if (TREE_CODE (index) == INTEGER_CST
+ if (poly_int_tree_p (index)
&& (low_bound = array_ref_low_bound (exp),
- TREE_CODE (low_bound) == INTEGER_CST)
+ poly_int_tree_p (low_bound))
&& (unit_size = array_ref_element_size (exp),
- host_integerp (unit_size, 1))
- && (doffset = double_int_sext
- (double_int_sub (TREE_INT_CST (index),
- TREE_INT_CST (low_bound)),
- TYPE_PRECISION (TREE_TYPE (index))),
- double_int_fits_in_shwi_p (doffset)))
+ TREE_CODE (unit_size) == INTEGER_CST))
{
- HOST_WIDE_INT hoffset = double_int_to_shwi (doffset);
- hoffset *= TREE_INT_CST_LOW (unit_size);
- hoffset *= BITS_PER_UNIT;
- bit_offset += hoffset;
+ poly_offset_int woffset
+ = wi::sext (wi::to_poly_offset (index)
+ - wi::to_poly_offset (low_bound),
+ TYPE_PRECISION (TREE_TYPE (index)));
+ woffset *= wi::to_offset (unit_size);
+ woffset <<= LOG2_BITS_PER_UNIT;
+ bit_offset += woffset;
/* An array ref with a constant index up in the structure
hierarchy will constrain the size of any variable array ref
/* We need to adjust maxsize to the whole array bitsize.
But we can subtract any constant offset seen so far,
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;
+ if (known_size_p (maxsize)
+ && asize
+ && poly_int_tree_p (asize))
+ maxsize = wi::to_poly_offset (asize) - bit_offset;
else
maxsize = -1;
/* Remember that we have seen an array ref with a variable
index. */
seen_variable_array_ref = true;
+
+ wide_int min, max;
+ if (TREE_CODE (index) == SSA_NAME
+ && (low_bound = array_ref_low_bound (exp),
+ poly_int_tree_p (low_bound))
+ && (unit_size = array_ref_element_size (exp),
+ TREE_CODE (unit_size) == INTEGER_CST)
+ && get_range_info (index, &min, &max) == VR_RANGE)
+ {
+ poly_offset_int lbound = wi::to_poly_offset (low_bound);
+ /* Try to constrain maxsize with range information. */
+ offset_int omax
+ = offset_int::from (max, TYPE_SIGN (TREE_TYPE (index)));
+ if (known_lt (lbound, omax))
+ {
+ poly_offset_int rmaxsize;
+ rmaxsize = (omax - lbound + 1)
+ * wi::to_offset (unit_size) << LOG2_BITS_PER_UNIT;
+ if (!known_size_p (maxsize)
+ || known_lt (rmaxsize, maxsize))
+ {
+ /* If we know an upper bound below the declared
+ one this is no longer variable. */
+ if (known_size_p (maxsize))
+ seen_variable_array_ref = false;
+ maxsize = rmaxsize;
+ }
+ }
+ /* Try to adjust bit_offset with range information. */
+ offset_int omin
+ = offset_int::from (min, TYPE_SIGN (TREE_TYPE (index)));
+ if (known_le (lbound, omin))
+ {
+ poly_offset_int woffset
+ = wi::sext (omin - lbound,
+ TYPE_PRECISION (TREE_TYPE (index)));
+ woffset *= wi::to_offset (unit_size);
+ woffset <<= LOG2_BITS_PER_UNIT;
+ bit_offset += woffset;
+ if (known_size_p (maxsize))
+ maxsize -= woffset;
+ }
+ }
}
}
break;
case VIEW_CONVERT_EXPR:
break;
+ case TARGET_MEM_REF:
+ /* Via the variable index or index2 we can reach the
+ whole object. Still hand back the decl here. */
+ if (TREE_CODE (TMR_BASE (exp)) == ADDR_EXPR
+ && (TMR_INDEX (exp) || TMR_INDEX2 (exp)))
+ {
+ exp = TREE_OPERAND (TMR_BASE (exp), 0);
+ bit_offset = 0;
+ maxsize = -1;
+ goto done;
+ }
+ /* Fallthru. */
case MEM_REF:
+ /* 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]
+ struct { int len; union { int a[1]; struct X x; } u; } x; x.u.a[d]
+ 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. This needs to include possible trailing
+ padding that is there for alignment purposes. */
+ if (seen_variable_array_ref
+ && known_size_p (maxsize)
+ && (TYPE_SIZE (TREE_TYPE (exp)) == NULL_TREE
+ || !poly_int_tree_p (TYPE_SIZE (TREE_TYPE (exp)))
+ || (maybe_eq
+ (bit_offset + maxsize,
+ wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (exp)))))))
+ maxsize = -1;
+
/* Hand back the decl for MEM[&decl, off]. */
if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR)
{
exp = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
else
{
- double_int off = mem_ref_offset (exp);
- off = double_int_lshift (off,
- BITS_PER_UNIT == 8
- ? 3 : exact_log2 (BITS_PER_UNIT),
- HOST_BITS_PER_DOUBLE_INT, true);
- off = double_int_add (off, shwi_to_double_int (bit_offset));
- if (double_int_fits_in_shwi_p (off))
+ poly_offset_int off = mem_ref_offset (exp);
+ off <<= LOG2_BITS_PER_UNIT;
+ off += bit_offset;
+ poly_int64 off_hwi;
+ if (off.to_shwi (&off_hwi))
{
- bit_offset = double_int_to_shwi (off);
+ bit_offset = off_hwi;
exp = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
}
}
}
goto done;
- case TARGET_MEM_REF:
- /* Hand back the decl for MEM[&decl, off]. */
- if (TREE_CODE (TMR_BASE (exp)) == ADDR_EXPR)
- {
- /* Via the variable index or index2 we can reach the
- whole object. */
- if (TMR_INDEX (exp) || TMR_INDEX2 (exp))
- {
- exp = TREE_OPERAND (TMR_BASE (exp), 0);
- bit_offset = 0;
- maxsize = -1;
- goto done;
- }
- if (integer_zerop (TMR_OFFSET (exp)))
- exp = TREE_OPERAND (TMR_BASE (exp), 0);
- else
- {
- double_int off = mem_ref_offset (exp);
- off = double_int_lshift (off,
- BITS_PER_UNIT == 8
- ? 3 : exact_log2 (BITS_PER_UNIT),
- HOST_BITS_PER_DOUBLE_INT, true);
- off = double_int_add (off, shwi_to_double_int (bit_offset));
- if (double_int_fits_in_shwi_p (off))
- {
- bit_offset = double_int_to_shwi (off);
- exp = TREE_OPERAND (TMR_BASE (exp), 0);
- }
- }
- }
- goto done;
-
default:
goto done;
}
exp = TREE_OPERAND (exp, 0);
}
+
done:
+ if (!bitsize.to_shwi (psize) || maybe_lt (*psize, 0))
+ {
+ *poffset = 0;
+ *psize = -1;
+ *pmax_size = -1;
- /* 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]
- struct { int len; union { int a[1]; struct X x; } u; } x; x.u.a[d]
- 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. This needs to include possible trailing padding
- that is there for alignment purposes. */
-
- if (seen_variable_array_ref
- && maxsize != -1
- && (!host_integerp (TYPE_SIZE (base_type), 1)
- || (bit_offset + maxsize
- == (signed) TREE_INT_CST_LOW (TYPE_SIZE (base_type)))))
- maxsize = -1;
+ return exp;
+ }
+
+ /* ??? 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. */
+ if (!bit_offset.to_shwi (poffset))
+ {
+ *poffset = 0;
+ *pmax_size = -1;
+
+ return exp;
+ }
/* In case of a decl or constant base object we can do better. */
if (DECL_P (exp))
{
+ if (VAR_P (exp)
+ && ((flag_unconstrained_commons && DECL_COMMON (exp))
+ || (DECL_EXTERNAL (exp) && seen_variable_array_ref)))
+ {
+ tree sz_tree = TYPE_SIZE (TREE_TYPE (exp));
+ /* If size is unknown, or we have read to the end, assume there
+ may be more to the structure than we are told. */
+ if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
+ || (seen_variable_array_ref
+ && (sz_tree == NULL_TREE
+ || !poly_int_tree_p (sz_tree)
+ || maybe_eq (bit_offset + maxsize,
+ wi::to_poly_offset (sz_tree)))))
+ maxsize = -1;
+ }
/* If maxsize is unknown adjust it according to the size of the
base decl. */
- if (maxsize == -1
- && host_integerp (DECL_SIZE (exp), 1))
- maxsize = TREE_INT_CST_LOW (DECL_SIZE (exp)) - bit_offset;
+ else if (!known_size_p (maxsize)
+ && DECL_SIZE (exp)
+ && poly_int_tree_p (DECL_SIZE (exp)))
+ maxsize = wi::to_poly_offset (DECL_SIZE (exp)) - bit_offset;
}
else if (CONSTANT_CLASS_P (exp))
{
/* If maxsize is unknown adjust it according to the size of the
base type constant. */
- if (maxsize == -1
- && host_integerp (TYPE_SIZE (TREE_TYPE (exp)), 1))
- maxsize = TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))) - bit_offset;
+ if (!known_size_p (maxsize)
+ && TYPE_SIZE (TREE_TYPE (exp))
+ && poly_int_tree_p (TYPE_SIZE (TREE_TYPE (exp))))
+ maxsize = (wi::to_poly_offset (TYPE_SIZE (TREE_TYPE (exp)))
+ - bit_offset);
}
- /* ??? 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;
+ if (!maxsize.to_shwi (pmax_size)
+ || maybe_lt (*pmax_size, 0)
+ || !endpoint_representable_p (*poffset, *pmax_size))
+ *pmax_size = -1;
+
+ /* Punt if *POFFSET + *PSIZE overflows in HOST_WIDE_INT, the callers don't
+ check for such overflows individually and assume it works. */
+ if (!endpoint_representable_p (*poffset, *psize))
+ {
+ *poffset = 0;
+ *psize = -1;
+ *pmax_size = -1;
+
+ return exp;
+ }
+
+ return exp;
+}
+
+/* Like get_ref_base_and_extent, but for cases in which we only care
+ about constant-width accesses at constant offsets. Return null
+ if the access is anything else. */
+
+tree
+get_ref_base_and_extent_hwi (tree exp, HOST_WIDE_INT *poffset,
+ HOST_WIDE_INT *psize, bool *preverse)
+{
+ poly_int64 offset, size, max_size;
+ HOST_WIDE_INT const_offset, const_size;
+ bool reverse;
+ tree decl = get_ref_base_and_extent (exp, &offset, &size, &max_size,
+ &reverse);
+ if (!offset.is_constant (&const_offset)
+ || !size.is_constant (&const_size)
+ || const_offset < 0
+ || !known_size_p (max_size)
+ || maybe_ne (max_size, const_size))
+ return NULL_TREE;
+
+ *poffset = const_offset;
+ *psize = const_size;
+ *preverse = reverse;
+ return decl;
+}
+
+/* Returns the base object and a constant BITS_PER_UNIT offset in *POFFSET that
+ denotes the starting address of the memory access EXP.
+ Returns NULL_TREE if the offset is not constant or any component
+ is not BITS_PER_UNIT-aligned.
+ VALUEIZE if non-NULL is used to valueize SSA names. It should return
+ its argument or a constant if the argument is known to be constant. */
+
+tree
+get_addr_base_and_unit_offset_1 (tree exp, poly_int64_pod *poffset,
+ tree (*valueize) (tree))
+{
+ poly_int64 byte_offset = 0;
+
+ /* Compute cumulative byte-offset for nested component-refs and array-refs,
+ and find the ultimate containing object. */
+ while (1)
+ {
+ switch (TREE_CODE (exp))
+ {
+ case BIT_FIELD_REF:
+ {
+ poly_int64 this_byte_offset;
+ poly_uint64 this_bit_offset;
+ if (!poly_int_tree_p (TREE_OPERAND (exp, 2), &this_bit_offset)
+ || !multiple_p (this_bit_offset, BITS_PER_UNIT,
+ &this_byte_offset))
+ return NULL_TREE;
+ byte_offset += this_byte_offset;
+ }
+ break;
+
+ case COMPONENT_REF:
+ {
+ tree field = TREE_OPERAND (exp, 1);
+ tree this_offset = component_ref_field_offset (exp);
+ poly_int64 hthis_offset;
+
+ if (!this_offset
+ || !poly_int_tree_p (this_offset, &hthis_offset)
+ || (TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field))
+ % BITS_PER_UNIT))
+ return NULL_TREE;
+
+ hthis_offset += (TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field))
+ / BITS_PER_UNIT);
+ byte_offset += hthis_offset;
+ }
+ break;
+
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ {
+ tree index = TREE_OPERAND (exp, 1);
+ tree low_bound, unit_size;
+
+ if (valueize
+ && TREE_CODE (index) == SSA_NAME)
+ index = (*valueize) (index);
+
+ /* If the resulting bit-offset is constant, track it. */
+ if (poly_int_tree_p (index)
+ && (low_bound = array_ref_low_bound (exp),
+ poly_int_tree_p (low_bound))
+ && (unit_size = array_ref_element_size (exp),
+ TREE_CODE (unit_size) == INTEGER_CST))
+ {
+ poly_offset_int woffset
+ = wi::sext (wi::to_poly_offset (index)
+ - wi::to_poly_offset (low_bound),
+ TYPE_PRECISION (TREE_TYPE (index)));
+ woffset *= wi::to_offset (unit_size);
+ byte_offset += woffset.force_shwi ();
+ }
+ else
+ return NULL_TREE;
+ }
+ break;
+
+ case REALPART_EXPR:
+ break;
+
+ case IMAGPART_EXPR:
+ byte_offset += TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (exp)));
+ break;
+
+ case VIEW_CONVERT_EXPR:
+ break;
+
+ case MEM_REF:
+ {
+ tree base = TREE_OPERAND (exp, 0);
+ if (valueize
+ && TREE_CODE (base) == SSA_NAME)
+ base = (*valueize) (base);
+
+ /* Hand back the decl for MEM[&decl, off]. */
+ if (TREE_CODE (base) == ADDR_EXPR)
+ {
+ if (!integer_zerop (TREE_OPERAND (exp, 1)))
+ {
+ poly_offset_int off = mem_ref_offset (exp);
+ byte_offset += off.force_shwi ();
+ }
+ exp = TREE_OPERAND (base, 0);
+ }
+ goto done;
+ }
+
+ case TARGET_MEM_REF:
+ {
+ tree base = TREE_OPERAND (exp, 0);
+ if (valueize
+ && TREE_CODE (base) == SSA_NAME)
+ base = (*valueize) (base);
+
+ /* Hand back the decl for MEM[&decl, off]. */
+ if (TREE_CODE (base) == ADDR_EXPR)
+ {
+ if (TMR_INDEX (exp) || TMR_INDEX2 (exp))
+ return NULL_TREE;
+ if (!integer_zerop (TMR_OFFSET (exp)))
+ {
+ poly_offset_int off = mem_ref_offset (exp);
+ byte_offset += off.force_shwi ();
+ }
+ exp = TREE_OPERAND (base, 0);
+ }
+ goto done;
+ }
+
+ default:
+ goto done;
+ }
+
+ exp = TREE_OPERAND (exp, 0);
+ }
+done:
+ *poffset = byte_offset;
return exp;
}
is not BITS_PER_UNIT-aligned. */
tree
-get_addr_base_and_unit_offset (tree exp, HOST_WIDE_INT *poffset)
+get_addr_base_and_unit_offset (tree exp, poly_int64_pod *poffset)
{
return get_addr_base_and_unit_offset_1 (exp, poffset, NULL);
}
SSA_NAME_OCCURS_IN_ABNORMAL_PHI set, otherwise false. */
bool
-stmt_references_abnormal_ssa_name (gimple stmt)
+stmt_references_abnormal_ssa_name (gimple *stmt)
{
ssa_op_iter oi;
use_operand_p use_p;
return false;
}
+
+/* If STMT takes any abnormal PHI values as input, replace them with
+ local copies. */
+
+void
+replace_abnormal_ssa_names (gimple *stmt)
+{
+ ssa_op_iter oi;
+ use_operand_p use_p;
+
+ FOR_EACH_SSA_USE_OPERAND (use_p, stmt, oi, SSA_OP_USE)
+ {
+ tree op = USE_FROM_PTR (use_p);
+ if (TREE_CODE (op) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op))
+ {
+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
+ tree new_name = make_ssa_name (TREE_TYPE (op));
+ gassign *assign = gimple_build_assign (new_name, op);
+ gsi_insert_before (&gsi, assign, GSI_SAME_STMT);
+ SET_USE (use_p, new_name);
+ }
+ }
+}
+
+/* Pair of tree and a sorting index, for dump_enumerated_decls. */
+struct GTY(()) numbered_tree
+{
+ tree t;
+ int num;
+};
+
+
+/* Compare two declarations references by their DECL_UID / sequence number.
+ Called via qsort. */
+
+static int
+compare_decls_by_uid (const void *pa, const void *pb)
+{
+ const numbered_tree *nt_a = ((const numbered_tree *)pa);
+ const numbered_tree *nt_b = ((const numbered_tree *)pb);
+
+ if (DECL_UID (nt_a->t) != DECL_UID (nt_b->t))
+ return DECL_UID (nt_a->t) - DECL_UID (nt_b->t);
+ return nt_a->num - nt_b->num;
+}
+
+/* Called via walk_gimple_stmt / walk_gimple_op by dump_enumerated_decls. */
+static tree
+dump_enumerated_decls_push (tree *tp, int *walk_subtrees, void *data)
+{
+ struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
+ vec<numbered_tree> *list = (vec<numbered_tree> *) wi->info;
+ numbered_tree nt;
+
+ if (!DECL_P (*tp))
+ return NULL_TREE;
+ nt.t = *tp;
+ nt.num = list->length ();
+ list->safe_push (nt);
+ *walk_subtrees = 0;
+ return NULL_TREE;
+}
+
+/* Find all the declarations used by the current function, sort them by uid,
+ and emit the sorted list. Each declaration is tagged with a sequence
+ number indicating when it was found during statement / tree walking,
+ so that TDF_NOUID comparisons of anonymous declarations are still
+ meaningful. Where a declaration was encountered more than once, we
+ emit only the sequence number of the first encounter.
+ FILE is the dump file where to output the list and FLAGS is as in
+ print_generic_expr. */
+void
+dump_enumerated_decls (FILE *file, dump_flags_t flags)
+{
+ if (!cfun->cfg)
+ return;
+
+ basic_block bb;
+ struct walk_stmt_info wi;
+ auto_vec<numbered_tree, 40> decl_list;
+
+ memset (&wi, '\0', sizeof (wi));
+ wi.info = (void *) &decl_list;
+ FOR_EACH_BB_FN (bb, cfun)
+ {
+ gimple_stmt_iterator gsi;
+
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+ if (!is_gimple_debug (gsi_stmt (gsi)))
+ walk_gimple_stmt (&gsi, NULL, dump_enumerated_decls_push, &wi);
+ }
+ decl_list.qsort (compare_decls_by_uid);
+ if (decl_list.length ())
+ {
+ unsigned ix;
+ numbered_tree *ntp;
+ tree last = NULL_TREE;
+
+ fprintf (file, "Declarations used by %s, sorted by DECL_UID:\n",
+ current_function_name ());
+ FOR_EACH_VEC_ELT (decl_list, ix, ntp)
+ {
+ if (ntp->t == last)
+ continue;
+ fprintf (file, "%d: ", ntp->num);
+ print_generic_decl (file, ntp->t, flags);
+ fprintf (file, "\n");
+ last = ntp->t;
+ }
+ }
+}
projects / gcc.git / blobdiff