/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
* @brief Construct and access dominator / post dominator tree.
* @author Goetz Lindenmaier, Michael Beck, Rubino Geiss
* @date 2.2002
- * @version $Id$
*/
#include "config.h"
#define get_dom_info(bl) (&(bl)->attr.block.dom)
#define get_pdom_info(bl) (&(bl)->attr.block.pdom)
-/*--------------------------------------------------------------------*/
-/** Accessing the dominator and post dominator data structures **/
-/*--------------------------------------------------------------------*/
-
ir_node *get_Block_idom(const ir_node *bl)
{
- assert(is_Block(bl));
if (get_Block_dom_depth(bl) == -1) {
/* This block is not reachable from Start */
- return new_Bad();
+ ir_graph *irg = get_irn_irg(bl);
+ return new_r_Bad(irg, mode_BB);
}
return get_dom_info(bl)->idom;
}
ir_node *get_Block_ipostdom(const ir_node *bl)
{
- assert(is_Block(bl));
if (get_Block_postdom_depth(bl) == -1) {
/* This block is not reachable from Start */
- return new_Bad();
+ ir_graph *irg = get_irn_irg(bl);
+ return new_r_Bad(irg, mode_BB);
}
return get_pdom_info(bl)->idom;
}
return get_pdom_info(bl)->max_subtree_pre_num;
}
-/* Check, if a block dominates another block. */
int block_dominates(const ir_node *a, const ir_node *b)
{
const ir_dom_info *ai, *bi;
return 0;
}
-/* Check, if a block strictly dominates another block. */
int block_strictly_dominates(const ir_node *a, const ir_node *b)
{
return (a != b) && block_dominates(a, b);
}
-/* Returns the smallest common dominator block of two nodes. */
ir_node *node_smallest_common_dominator(ir_node *a, ir_node *b)
{
ir_node *bl_a = is_Block(a) ? a : get_nodes_block(a);
return dom_bl;
}
-/* Returns the smallest common dominator block of all users of a node. */
-ir_node *node_users_smallest_common_dominator(ir_node *irn, int handle_phi)
-{
- int n, j, i = 0, success;
- ir_node **user_blocks, *dom_bl;
- const ir_edge_t *edge;
-
- assert(! is_Block(irn) && "WRONG USAGE of node_users_smallest_common_dominator");
- assert(edges_activated(get_irn_irg(irn)) && "need edges activated");
-
- n = get_irn_n_edges(irn);
-
- /* get array to hold all block of the node users */
- NEW_ARR_A(ir_node *, user_blocks, n);
- foreach_out_edge(irn, edge) {
- ir_node *src = get_edge_src_irn(edge);
-
- if (is_Phi(src) && handle_phi) {
- /* get the corresponding cfg predecessor block if phi handling requested */
- j = get_edge_src_pos(edge);
- assert(j >= 0 && "kaputt");
- user_blocks[i++] = get_Block_cfgpred_block(get_nodes_block(src), j);
- }
- else
- user_blocks[i++] = is_Block(src) ? src : get_nodes_block(src);
- }
-
- assert(i == n && "get_irn_n_edges probably broken");
-
- /* in case of only one user: return the block of the user */
- if (n == 1)
- return user_blocks[0];
-
- i = 0;
- /* search the smallest block dominating all user blocks */
- do {
- dom_bl = node_smallest_common_dominator(user_blocks[i], user_blocks[i + 1]);
- success = 1;
-
- /* check if this block dominates all remaining blocks as well */
- for (j = i + 2; j < n; j++) {
- if (! block_dominates(dom_bl, user_blocks[j]))
- success = 0;
- }
-
- if (success)
- break;
-
- /* inherit the dominator block of the first (i + 1) users */
- user_blocks[++i] = dom_bl;
- } while (i < n - 1);
-
- assert(success && "no block found dominating all users");
-
- return dom_bl;
-}
-
-
/* Get the first node in the list of nodes dominated by a given block. */
ir_node *get_Block_dominated_first(const ir_node *bl)
{
return get_dom_info(bl)->first;
}
-/* Get the next node in a list of nodes which are dominated by some
- * other node. */
ir_node *get_Block_dominated_next(const ir_node *bl)
{
assert(is_Block(bl));
return get_dom_info(bl)->next;
}
-/* Check, if a block post dominates another block. */
int block_postdominates(const ir_node *a, const ir_node *b)
{
const ir_dom_info *ai, *bi;
return 0;
}
-/* Check, if a block strictly dominates another block. */
int block_strictly_postdominates(const ir_node *a, const ir_node *b)
{
return (a != b) && block_postdominates(a, b);
}
-
-/* Get the first node in the list of nodes post dominated by a given block. */
ir_node *get_Block_postdominated_first(const ir_node *bl)
{
assert(is_Block(bl));
return get_pdom_info(bl)->first;
}
-/* Get the next node in a list of nodes which are post dominated by some
- * other node. */
ir_node *get_Block_postdominated_next(const ir_node *bl)
{
assert(is_Block(bl));
return get_pdom_info(bl)->next;
}
-/* Visit all nodes in the dominator subtree of a given node. */
void dom_tree_walk(ir_node *bl, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
post(bl, env);
}
-/* Visit all nodes in the post dominator subtree of a given node. */
void postdom_tree_walk(ir_node *bl, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
post(bl, env);
}
-/* Walk over the dominator tree of an irg starting at the root. */
void dom_tree_walk_irg(ir_graph *irg, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
/* The root of the dominator tree should be the Start block. */
ir_node *root = get_irg_start_block(irg);
- assert(irg->dom_state == dom_consistent
+ assert(irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE)
&& "The dominators of the irg must be consistent");
assert(root && "The start block of the graph is NULL?");
assert(get_dom_info(root)->idom == NULL
dom_tree_walk(root, pre, post, env);
}
-/* Walk over the post dominator tree of an irg starting at the root. */
void postdom_tree_walk_irg(ir_graph *irg, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
- /* The root of the dominator tree should be the End block. */
+ /* The root of the post dominator tree should be the End block. */
ir_node *root = get_irg_end_block(irg);
- assert(irg->pdom_state == dom_consistent
+ assert(irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_POSTDOMINANCE)
&& "The dominators of the irg must be consistent");
assert(root && "The end block of the graph is NULL?");
assert(get_pdom_info(root)->idom == NULL
static void assign_tree_dom_pre_order(ir_node *bl, void *data)
{
- unsigned *num = data;
+ unsigned *num = (unsigned*) data;
ir_dom_info *bi = get_dom_info(bl);
bi->tree_pre_num = (*num)++;
static void assign_tree_postdom_pre_order(ir_node *bl, void *data)
{
- unsigned *num = data;
+ unsigned *num = (unsigned*) data;
ir_dom_info *bi = get_pdom_info(bl);
bi->tree_pre_num = (*num)++;
assert(bi->max_subtree_pre_num >= bi->tree_pre_num);
}
-/*--------------------------------------------------------------------*/
-/* Building and Removing the dominator data structure */
-/*--------------------------------------------------------------------*/
-
/**
* count the number of blocks and clears the post dominance info
*/
{
int *n_blocks = (int *) env;
- if (is_Block_dead(bl))
- return;
-
(*n_blocks) ++;
memset(get_pdom_info(bl), 0, sizeof(ir_dom_info));
tmp_dom_info *tdi;
int i;
- if (is_Block_dead(bl))
- return;
-
- assert(is_Block(bl));
if (Block_block_visited(bl))
return;
mark_Block_block_visited(bl);
tmp_dom_info *tdi;
int i;
- if (is_Block_dead(bl))
- return;
-
- assert(is_Block(bl));
if (get_irg_block_visited(current_ir_graph) == get_Block_block_visited(bl))
return;
mark_Block_block_visited(bl);
ir_node *pred = get_Block_cfgpred_block(bl, i);
if (is_Bad(pred))
continue;
- assert(is_Block(pred));
init_tmp_pdom_info(pred, tdi, tdi_list, used, n_blocks);
}
static void count_and_init_blocks_dom(ir_node *bl, void *env)
{
int *n_blocks = (int *) env;
- if (is_Block_dead(bl))
- return;
(*n_blocks) ++;
set_Block_dom_depth(bl, -1);
}
-/* Computes the dominator trees. Sets a flag in irg to "dom_consistent".
- If the control flow of the graph is changed this flag must be set to
- "dom_inconsistent". */
void compute_doms(ir_graph *irg)
{
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
/* Update graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- irg->dom_state = dom_consistent;
+ assert(!irg_is_constrained(irg, IR_GRAPH_CONSTRAINT_CONSTRUCTION));
/* Count the number of blocks in the graph. */
n_blocks = 0;
for (i = n_blocks-1; i > 0; i--) { /* Don't iterate the root, it's done. */
- int irn_arity;
- tmp_dom_info *w = &tdi_list[i];
+ tmp_dom_info *w = &tdi_list[i];
+ ir_node *block = w->block;
tmp_dom_info *v;
+ int irn_arity;
/* Step 2 */
- irn_arity = get_irn_arity(w->block);
+ irn_arity = get_irn_arity(block);
for (j = 0; j < irn_arity; j++) {
- ir_node *pred = get_Block_cfgpred_block(w->block, j);
+ ir_node *pred = get_Block_cfgpred(block, j);
+ ir_node *pred_block = get_nodes_block(pred);
tmp_dom_info *u;
- if (is_Bad(pred) || (get_Block_dom_pre_num (pred) == -1))
- continue; /* control-dead */
+ if (is_Bad(pred) || (get_Block_dom_pre_num (pred_block) == -1))
+ continue; /* unreachable */
- u = dom_eval (&tdi_list[get_Block_dom_pre_num(pred)]);
- if (u->semi < w->semi) w->semi = u->semi;
+ u = dom_eval (&tdi_list[get_Block_dom_pre_num(pred_block)]);
+ if (u->semi < w->semi)
+ w->semi = u->semi;
}
/* handle keep-alives if we are at the end block */
- if (w->block == get_irg_end_block(irg)) {
+ if (block == get_irg_end_block(irg)) {
ir_node *end = get_irg_end(irg);
irn_arity = get_irn_arity(end);
ir_node *pred = get_irn_n(end, j);
tmp_dom_info *u;
- if (is_no_Block(pred) || get_Block_dom_pre_num(pred) == -1)
- continue; /* control-dead */
+ if (!is_Block(pred) || get_Block_dom_pre_num(pred) == -1)
+ continue; /* unreachable */
u = dom_eval (&tdi_list[get_Block_dom_pre_num(pred)]);
- if (u->semi < w->semi) w->semi = u->semi;
+ if (u->semi < w->semi)
+ w->semi = u->semi;
}
}
if (! w->dom)
continue; /* control dead */
- if (w->dom != w->semi) w->dom = w->dom->dom;
+ if (w->dom != w->semi)
+ w->dom = w->dom->dom;
set_Block_idom(w->block, w->dom->block);
/* blocks dominated by dead one's are still dead */
/* Do a walk over the tree and assign the tree pre orders. */
{
unsigned tree_pre_order = 0;
- dom_tree_walk_irg(irg, assign_tree_dom_pre_order,
- assign_tree_dom_pre_order_max, &tree_pre_order);
+ dom_tree_walk(get_irg_start_block(irg), assign_tree_dom_pre_order,
+ assign_tree_dom_pre_order_max, &tree_pre_order);
}
current_ir_graph = rem;
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
}
void assure_doms(ir_graph *irg)
{
- if (get_irg_dom_state(irg) != dom_consistent)
+ if (! irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE))
compute_doms(irg);
}
void free_dom(ir_graph *irg)
{
/* Update graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- irg->dom_state = dom_none;
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
- /* With the implementation right now there is nothing to free,
- but better call it anyways... */
+ /* With the implementation right now there is nothing to free */
+
+ /* free dominance frontiers */
+ ir_free_dominance_frontiers(irg);
}
-/* Computes the post dominator trees. Sets a flag in irg to "dom_consistent".
- If the control flow of the graph is changed this flag must be set to
- "dom_inconsistent". */
void compute_postdoms(ir_graph *irg)
{
ir_graph *rem = current_ir_graph;
current_ir_graph = irg;
/* Update graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- irg->pdom_state = dom_consistent;
+ assert(!irg_is_constrained(irg, IR_GRAPH_CONSTRAINT_CONSTRUCTION));
/* Count the number of blocks in the graph. */
n_blocks = 0;
tmp_dom_info *u;
if (get_Block_postdom_pre_num (succ) == -1)
- continue; /* endless-loop */
+ continue; /* endless-loop */
u = dom_eval (&tdi_list[get_Block_postdom_pre_num(succ)]);
if (u->semi < w->semi) w->semi = u->semi;
/* Do a walk over the tree and assign the tree pre orders. */
{
unsigned tree_pre_order = 0;
- postdom_tree_walk_irg(irg, assign_tree_postdom_pre_order,
+ postdom_tree_walk(get_irg_end_block(irg), assign_tree_postdom_pre_order,
assign_tree_postdom_pre_order_max, &tree_pre_order);
}
current_ir_graph = rem;
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_POSTDOMINANCE);
}
void assure_postdoms(ir_graph *irg)
{
- if (get_irg_postdom_state(irg) != dom_consistent)
+ if (! irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_POSTDOMINANCE))
compute_postdoms(irg);
}
void free_postdom(ir_graph *irg)
{
/* Update graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- irg->pdom_state = dom_none;
-
- /* With the implementation right now there is nothing to free,
- but better call it anyways... */
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_POSTDOMINANCE);
}
projects / libfirm / blobdiff