+/*
+ * 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.
+ */
+
/**
- * Interblock liveness analysis.
- * @author Sebastian Hack
- * @date 6.12.2004
+ * @file
+ * @brief Interblock liveness analysis.
+ * @author Sebastian Hack
+ * @date 06.12.2004
+ * @version $Id$
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
+/* statev is expensive here, only enable when needed */
+#define DISABLE_STATEV
+
#include "impl.h"
#include "iredges_t.h"
#include "irgwalk.h"
#include "irprintf_t.h"
+#include "irbitset.h"
+#include "irdump_t.h"
+#include "irnodeset.h"
+
+#include "dfs_t.h"
+#include "absgraph.h"
+#include "statev.h"
#include "beutil.h"
#include "belive_t.h"
+#include "beirg_t.h"
+#include "besched_t.h"
+#include "bemodule.h"
+
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
+
+/* see comment in compute_liveness() */
+#define LV_COMPUTE_SORTED
+#define LV_STD_SIZE 64
+#define LV_USE_BINARY_SEARCH
+#undef LV_INTESIVE_CHECKS
+
+void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc);
+
+static INLINE int is_liveness_node(const ir_node *irn)
+{
+ switch(get_irn_opcode(irn)) {
+ case iro_Block:
+ case iro_Bad:
+ case iro_End:
+ case iro_Anchor:
+ case iro_NoMem:
+ return 0;
+ default:;
+ }
+
+ return 1;
+}
+
+int (be_lv_next_irn)(const struct _be_lv_t *lv, const ir_node *bl, unsigned flags, int i)
+{
+ return _be_lv_next_irn(lv, bl, flags, i);
+}
+
+const ir_node * (be_lv_get_irn)(const struct _be_lv_t *lv, const ir_node *bl, int i)
+{
+ return _be_lv_get_irn(lv, bl, i);
+}
+
+int (be_is_live_in)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+ return _be_is_live_xxx(lv, block, irn, be_lv_state_in);
+}
+
+int (be_is_live_out)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+ return _be_is_live_xxx(lv, block, irn, be_lv_state_out);
+}
+
+int (be_is_live_end)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+ return _be_is_live_xxx(lv, block, irn, be_lv_state_end);
+}
+
+
+#ifdef LV_USE_BINARY_SEARCH
+static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx)
+{
+ struct _be_lv_info_t *payload = arr + 1;
+
+ unsigned n = arr[0].u.head.n_members;
+ unsigned res = 0;
+ int lo = 0;
+ int hi = n;
+
+ if(n == 0)
+ return 0;
+
+ while(lo < hi) {
+ int md = lo + ((hi - lo) >> 1);
+ unsigned md_idx = payload[md].u.node.idx;
+
+ if(idx > md_idx)
+ lo = md + 1;
+ else if(idx < md_idx)
+ hi = md;
+ else {
+ res = md;
+ assert(payload[res].u.node.idx == idx);
+ break;
+ }
+
+ res = lo;
+ }
+
+#ifdef LV_INTESIVE_CHECKS
+ {
+ unsigned i;
+ for(i = res; i < n; ++i)
+ assert(payload[i].u.node.idx >= idx);
+
+ for(i = 0; i < res; ++i)
+ assert(payload[i].u.node.idx < idx);
+ }
+#endif
+
+ return res;
+}
+
+#else
+
+/**
+ * This function searches linearly for the node in the array.
+ */
+static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx) {
+ unsigned n = arr[0].u.head.n_members;
+ unsigned i;
+
+ for(i = 0; i < n; ++i) {
+ if(arr[i + 1].u.node.idx == idx)
+ return i;
+ }
+
+ return i;
+}
+#endif
+
+struct _be_lv_info_node_t *be_lv_get(const struct _be_lv_t *li, const ir_node *bl, const ir_node *irn)
+{
+ struct _be_lv_info_t *irn_live;
+ struct _be_lv_info_node_t *res = NULL;
+
+ stat_ev_tim_push();
+ irn_live = phase_get_irn_data(&li->ph, bl);
+ if(irn_live) {
+ unsigned idx = get_irn_idx(irn);
+
+ /* Get the position of the index in the array. */
+ int pos = _be_liveness_bsearch(irn_live, idx);
+
+ /* Get the record in question. 1 must be added, since the first record contains information about the array and must be skipped. */
+ struct _be_lv_info_node_t *rec = &irn_live[pos + 1].u.node;
+
+ /* Check, if the irn is in deed in the array. */
+ if(rec->idx == idx)
+ res = rec;
+ }
+ stat_ev_tim_pop("be_lv_get");
+
+ return res;
+}
+
+static struct _be_lv_info_node_t *be_lv_get_or_set(struct _be_lv_t *li, ir_node *bl, ir_node *irn)
+{
+ struct _be_lv_info_t *irn_live = phase_get_or_set_irn_data(&li->ph, bl);
+
+ unsigned idx = get_irn_idx(irn);
+
+ /* Get the position of the index in the array. */
+ unsigned pos = _be_liveness_bsearch(irn_live, idx);
+
+ /* Get the record in question. 1 must be added, since the first record contains information about the array and must be skipped. */
+ struct _be_lv_info_node_t *res = &irn_live[pos + 1].u.node;
+
+ /* Check, if the irn is in deed in the array. */
+ if(res->idx != idx) {
+ struct _be_lv_info_t *payload;
+ unsigned n_members = irn_live[0].u.head.n_members;
+ unsigned n_size = irn_live[0].u.head.n_size;
+ unsigned i;
+
+ if(n_members + 1 >= n_size) {
+ /* double the array size. Remember that the first entry is
+ * metadata about the array and not a real array element */
+ unsigned old_size_bytes = (n_size + 1) * sizeof(irn_live[0]);
+ unsigned new_size = (2 * n_size) + 1;
+ size_t new_size_bytes = new_size * sizeof(irn_live[0]);
+ struct _be_lv_info_t *nw = phase_alloc(&li->ph, new_size_bytes);
+ memcpy(nw, irn_live, old_size_bytes);
+ memset(((char*) nw) + old_size_bytes, 0,
+ new_size_bytes - old_size_bytes);
+ nw[0].u.head.n_size = new_size - 1;
+ irn_live = nw;
+ phase_set_irn_data(&li->ph, bl, nw);
+ }
+
+ payload = &irn_live[1];
+ for(i = n_members; i > pos; --i) {
+ payload[i] = payload[i - 1];
+ }
+
+ ++irn_live[0].u.head.n_members;
+
+ res = &payload[pos].u.node;
+ res->idx = idx;
+ res->flags = 0;
+ }
-FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
-FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
-FIRM_IMPL2(is_live_end, int, const ir_node *, const ir_node *)
+#ifdef LV_INTESIVE_CHECKS
+ {
+ unsigned i;
+ unsigned n = irn_live[0].u.head.n_members;
+ unsigned last = 0;
+ struct _be_lv_info_t *payload = &irn_live[1];
+
+ for(i = 0; i < n; ++i) {
+ assert(payload[i].u.node.idx >= last);
+ last = payload[i].u.node.idx;
+ }
+ }
+#endif
-/** The offset of the liveness information in a firm node. */
-size_t live_irg_data_offset = 0;
+ return res;
+}
-void be_liveness_init(void)
+/**
+ * Removes a node from the list of live variables of a block.
+ * @return 1 if the node was live at that block, 0 if not.
+ */
+static int be_lv_remove(struct _be_lv_t *li, const ir_node *bl,
+ const ir_node *irn)
{
- live_irg_data_offset = register_additional_graph_data(sizeof(irn_live_t));
+ struct _be_lv_info_t *irn_live = phase_get_irn_data(&li->ph, bl);
+
+ if(irn_live) {
+ unsigned n = irn_live[0].u.head.n_members;
+ unsigned idx = get_irn_idx(irn);
+ unsigned pos = _be_liveness_bsearch(irn_live, idx);
+ struct _be_lv_info_t *payload = irn_live + 1;
+ struct _be_lv_info_node_t *res = &payload[pos].u.node;
+
+ /* The node is in deed in the block's array. Let's remove it. */
+ if(res->idx == idx) {
+ unsigned i;
+
+ for(i = pos + 1; i < n; ++i)
+ payload[i - 1] = payload[i];
+
+ payload[n - 1].u.node.idx = 0;
+ payload[n - 1].u.node.flags = 0;
+
+ --irn_live[0].u.head.n_members;
+ DBG((dbg, LEVEL_3, "\tdeleting %+F from %+F at pos %d\n", irn, bl, pos));
+ return 1;
+ }
+ }
+
+ return 0;
}
-static INLINE void mark_live_in(ir_node *block, const ir_node *irn)
+static void register_node(be_lv_t *lv, const ir_node *irn)
{
- _get_or_set_live(block, irn, live_state_in);
+ unsigned idx = get_irn_idx(irn);
+ if(idx >= bitset_size(lv->nodes)) {
+ bitset_t *nw = bitset_malloc(2 * idx);
+ bitset_copy(nw, lv->nodes);
+ bitset_free(lv->nodes);
+ lv->nodes = nw;
+ }
+
+ bitset_set(lv->nodes, idx);
}
-static INLINE void mark_live_out(ir_node *block, const ir_node *irn)
+/**
+ * Mark a node as live-in in a block.
+ */
+static INLINE void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn)
{
- _get_or_set_live(block, irn, live_state_out | live_state_end);
+ struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+ DBG((dbg, LEVEL_2, "marking %+F live in at %+F\n", irn, block));
+ n->flags |= be_lv_state_in;
+ register_node(lv, irn);
}
-static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
+/**
+ * Mark a node as live-out in a block.
+ */
+static INLINE void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn)
+{
+ struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+ DBG((dbg, LEVEL_2, "marking %+F live out at %+F\n", irn, block));
+ n->flags |= be_lv_state_out | be_lv_state_end;
+ register_node(lv, irn);
+}
+
+/**
+ * Mark a node as live-end in a block.
+ */
+static INLINE void mark_live_end(be_lv_t *lv, ir_node *block, ir_node *irn)
{
- _get_or_set_live(block, irn, live_state_end);
+ struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+ DBG((dbg, LEVEL_2, "marking %+F live end at %+F\n", irn, block));
+ n->flags |= be_lv_state_end;
+ register_node(lv, irn);
}
/**
* @param is_true_out Is the node real out there or only live at the end
* of the block.
*/
-static void live_end_at_block(ir_node *def, ir_node *block,
- pset *visited, int is_true_out)
+static void live_end_at_block(be_lv_t *lv, ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
{
- mark_live_end(block, def);
- if(is_true_out)
- mark_live_out(block, def);
+ mark_live_end(lv, block, def);
+ if(is_true_out)
+ mark_live_out(lv, block, def);
- if(!pset_find_ptr(visited, block)) {
+ if(!bitset_contains_irn(visited, block)) {
+ bitset_add_irn(visited, block);
- pset_insert_ptr(visited, block);
+ /*
+ * If this block is not the definition block, we have to go up
+ * further.
+ */
+ if(get_nodes_block(def) != block) {
+ int i, n;
- /*
- * If this block is not the definition block, we have to go up
- * further.
- */
- if(get_nodes_block(def) != block) {
- int i, n;
+ mark_live_in(lv, block, def);
- mark_live_in(block, def);
-
- for(i = 0, n = get_irn_arity(block); i < n; ++i)
- live_end_at_block(def, get_Block_cfgpred_block(block, i), visited, 1);
- }
+ for(i = 0, n = get_Block_n_cfgpreds(block); i < n; ++i)
+ live_end_at_block(lv, def, get_Block_cfgpred_block(block, i), visited, 1);
+ }
- }
+ }
}
+struct _lv_walker_t {
+ be_lv_t *lv;
+ void *data;
+};
+
+typedef struct lv_remove_walker_t {
+ be_lv_t *lv;
+ const ir_node *irn;
+} lv_remove_walker_t;
+
+
/**
* Liveness analysis for a value.
* This functions is meant to be called by a firm walker, to compute the
* @param irn The node (value).
* @param env Ignored.
*/
-static void liveness_for_node(ir_node *irn, void *env)
-{
- const ir_edge_t *edge;
- ir_node *def_block;
- pset *visited;
-
- /* Don't compute liveness information for non-data nodes. */
- if(!is_data_node(irn))
- return;
-
- visited = pset_new_ptr(512);
- def_block = get_nodes_block(irn);
-
- /* Go over all uses of the value */
- foreach_out_edge(irn, edge) {
- ir_node *use = edge->src;
- ir_node *use_block;
-
- /*
- * If the usage is no data node, skip this use, since it does not
- * affect the liveness of the node.
- */
- if(!is_data_node(use))
- continue;
-
- /* Get the block where the usage is in. */
- use_block = get_nodes_block(use);
-
- /*
- * If the use is a phi function, determine the corresponding block
- * through which the value reaches the phi function and mark the
- * value as live out of that block.
- */
- if(is_Phi(use)) {
+static void liveness_for_node(ir_node *irn, void *data)
+{
+ struct _lv_walker_t *walker = data;
+ be_lv_t *lv = walker->lv;
+ bitset_t *visited = walker->data;
+ const ir_edge_t *edge;
+ ir_node *def_block;
+
+ /* Don't compute liveness information for non-data nodes. */
+ if(!is_liveness_node(irn))
+ return;
+
+ bitset_clear_all(visited);
+ def_block = get_nodes_block(irn);
+
+ /* Go over all uses of the value */
+ foreach_out_edge(irn, edge) {
+ ir_node *use = edge->src;
+ ir_node *use_block;
+
+ DBG((dbg, LEVEL_4, "%+F: use at %+F, pos %d in %+F\n", irn, use, edge->pos, get_block(use)));
+ assert(get_irn_n(use, edge->pos) == irn);
+
+ /*
+ * If the usage is no data node, skip this use, since it does not
+ * affect the liveness of the node.
+ */
+ if(!is_liveness_node(use))
+ continue;
+
+ /* Get the block where the usage is in. */
+ use_block = get_nodes_block(use);
+
+ /*
+ * If the use is a phi function, determine the corresponding block
+ * through which the value reaches the phi function and mark the
+ * value as live out of that block.
+ */
+ if(is_Phi(use)) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, edge->pos);
- live_end_at_block(irn, pred_block, visited, 0);
- }
-
- /*
- * Else, the value is live in at this block. Mark it and call live
- * out on the predecessors.
- */
- else if(def_block != use_block) {
- int i, n;
-
- mark_live_in(use_block, irn);
-
- for(i = 0, n = get_irn_arity(use_block); i < n; ++i) {
- ir_node *pred_block = get_nodes_block(get_irn_n(use_block, i));
- live_end_at_block(irn, pred_block, visited, 1);
- }
- }
- }
-
- del_pset(visited);
-}
-
-static int cmp_irn_live(const void *a, const void *b, size_t size)
-{
- const irn_live_t *p = a;
- const irn_live_t *q = b;
-
- return !(p->block == q->block && p->irn == q->irn);
-}
-
-static int (*old_dump_block_func)(ir_node *self, FILE *F, dump_reason_t reason) = NULL;
-
-static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
-{
- switch(reason) {
- case dump_node_opcode_txt:
- fprintf(F, get_irn_opname(self));
- break;
- case dump_node_mode_txt:
- fprintf(F, get_irn_modename(self));
- break;
- case dump_node_nodeattr_txt:
- break;
- case dump_node_info_txt:
- if(!get_irg_live_info(get_irn_irg(self))->live)
- return 0;
-
- fprintf(F, "liveness information:\n");
- {
- irn_live_t *li;
- live_foreach(self, li) {
- ir_fprintf(F, "%+F", li->irn);
- if(live_is_in(li))
- fprintf(F, " in");
- if(live_is_end(li))
- fprintf(F, " end");
- if(live_is_out(li))
- fprintf(F, " out");
-
- fprintf(F, "\n");
+ live_end_at_block(lv, irn, pred_block, visited, 0);
+ }
+
+ /*
+ * Else, the value is live in at this block. Mark it and call live
+ * out on the predecessors.
+ */
+ else if(def_block != use_block) {
+ int i, n;
+
+ mark_live_in(lv, use_block, irn);
+
+ for(i = 0, n = get_Block_n_cfgpreds(use_block); i < n; ++i) {
+ ir_node *pred_block = get_Block_cfgpred_block(use_block, i);
+ live_end_at_block(lv, irn, pred_block, visited, 1);
}
}
}
+}
- return 0;
+static void lv_remove_irn_walker(ir_node *bl, void *data)
+{
+ lv_remove_walker_t *w = data;
+ be_lv_remove(w->lv, bl, w->irn);
+}
+
+static const char *lv_flags_to_str(unsigned flags)
+{
+ static const char *states[] = {
+ "---",
+ "i--",
+ "-e-",
+ "ie-",
+ "--o",
+ "i-o",
+ "-eo",
+ "ieo"
+ };
+
+ return states[flags & 7];
}
-void be_liveness(ir_graph *irg)
+static void lv_dump_block(void *context, FILE *f, const ir_node *bl)
{
- irg_live_info_t *live_info = get_irg_live_info(irg);
- if(live_info->live)
- del_set(live_info->live);
+ if(is_Block(bl)) {
+ be_lv_t *lv = context;
+ struct _be_lv_info_t *info = phase_get_irn_data(&lv->ph, bl);
+
+ fprintf(f, "liveness:\n");
+ if(info) {
+ unsigned n = info[0].u.head.n_members;
+ unsigned i;
+
+ for(i = 0; i < n; ++i) {
+ struct _be_lv_info_node_t *n = &info[i+1].u.node;
+ ir_fprintf(f, "%s %+F\n", lv_flags_to_str(n->flags), get_idx_irn(lv->irg, n->idx));
+ }
+ }
+ }
+}
- live_info->live = new_set(cmp_irn_live, 8192);
- irg_walk_graph(irg, liveness_for_node, NULL, NULL);
+static void *lv_phase_data_init(ir_phase *phase, const ir_node *irn, void *old)
+{
+ struct _be_lv_info_t *info = phase_alloc(phase, LV_STD_SIZE * sizeof(info[0]));
+ (void) irn;
+ (void) old;
- old_dump_block_func = op_Block->ops.dump_node;
- op_Block->ops.dump_node = dump_block_func;
+ memset(info, 0, LV_STD_SIZE * sizeof(info[0]));
+ info[0].u.head.n_size = LV_STD_SIZE - 1;
+ return info;
}
-static void dump_liveness_walker(ir_node *bl, void *data)
+static void collect_nodes(ir_node *irn, void *data)
{
- FILE *f = data;
- const irn_live_t *li;
- char buf[64];
+ struct obstack *obst = data;
+ if (is_liveness_node(irn))
+ obstack_ptr_grow(obst, irn);
+}
- ir_fprintf(f, "%+F\n", bl);
- live_foreach(bl, li) {
- strcpy(buf, "");
+static int node_idx_cmp(const void *a, const void *b)
+{
+ const ir_node *p = *(ir_node **) a;
+ const ir_node *q = *(ir_node **) b;
+ int ia = get_irn_idx(p);
+ int ib = get_irn_idx(q);
+ return ia - ib;
+}
- if(live_is_in(li))
- strcat(buf, "in ");
+static void compute_liveness(be_lv_t *lv)
+{
+ struct obstack obst;
+ struct _lv_walker_t w;
+ ir_node **nodes;
+ int i, n;
+
+ stat_ev_tim_push();
+ obstack_init(&obst);
+ irg_walk_graph(lv->irg, collect_nodes, NULL, &obst);
+ n = obstack_object_size(&obst) / sizeof(nodes[0]);
+ nodes = obstack_finish(&obst);
+
+ /*
+ * inserting the variables sorted by their ID is probably
+ * more efficient since the binary sorted set insertion
+ * will not need to move around the data.
+ * However, if sorting the variables a priori pays off
+ * needs to be checked, hence the define.
+ */
+#ifdef LV_COMPUTE_SORTED
+ qsort(nodes, n, sizeof(nodes[0]), node_idx_cmp);
+#endif
- if(live_is_end(li))
- strcat(buf, "end ");
+ w.lv = lv;
+ w.data = bitset_obstack_alloc(&obst, get_irg_last_idx(lv->irg));
- if(live_is_out(li))
- strcat(buf, "out ");
+ for (i = 0; i < n; ++i)
+ liveness_for_node(nodes[i], &w);
- ir_fprintf(f, "\t%+20F %s\n", li->irn, buf);
+ obstack_free(&obst, NULL);
+ register_hook(hook_node_info, &lv->hook_info);
+ stat_ev_tim_pop("be_lv_sets_cons");
+}
+
+void be_liveness_assure_sets(be_lv_t *lv)
+{
+ if (!lv->nodes) {
+ BE_TIMER_PUSH(t_live);
+
+ lv->nodes = bitset_malloc(2 * get_irg_last_idx(lv->irg));
+ phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL);
+ compute_liveness(lv);
+ /* be_live_chk_compare(lv, lv->lvc); */
+
+ BE_TIMER_POP(t_live);
+ }
+}
+
+void be_liveness_assure_chk(be_lv_t *lv)
+{
+#ifndef USE_LIVE_CHK
+ BE_TIMER_PUSH(t_verify);
+ be_liveness_assure_sets(lv);
+ BE_TIMER_POP(t_verify);
+#else
+ (void) lv;
+#endif
+}
+
+void be_liveness_invalidate(be_lv_t *lv)
+{
+ if (lv && lv->nodes) {
+ unregister_hook(hook_node_info, &lv->hook_info);
+ phase_free(&lv->ph);
+ bitset_free(lv->nodes);
+ lv->nodes = NULL;
}
}
-void be_liveness_dump(ir_graph *irg, FILE *f)
+/* Compute the inter block liveness for a graph. */
+be_lv_t *be_liveness(const be_irg_t *birg)
{
- irg_block_walk_graph(irg, dump_liveness_walker, NULL, f);
+ be_lv_t *lv = XMALLOCZ(be_lv_t);
+
+ lv->irg = be_get_birg_irg(birg);
+ lv->birg = birg;
+#ifdef USE_LIVE_CHK
+ lv->dfs = dfs_new(&absgraph_irg_cfg_succ, lv->irg);
+ lv->lvc = lv_chk_new(lv->irg, lv->dfs);
+#endif
+ lv->hook_info.context = lv;
+ lv->hook_info.hook._hook_node_info = lv_dump_block;
+
+ return lv;
}
-void be_liveness_dumpto(ir_graph *irg, const char *cls_name)
+void be_liveness_recompute(be_lv_t *lv)
+{
+ unsigned last_idx;
+
+ BE_TIMER_PUSH(t_live);
+ last_idx = get_irg_last_idx(lv->irg);
+ if(last_idx >= bitset_size(lv->nodes)) {
+ bitset_free(lv->nodes);
+ lv->nodes = bitset_malloc(last_idx * 2);
+ } else
+ bitset_clear_all(lv->nodes);
+
+ phase_free(&lv->ph);
+ phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL);
+ compute_liveness(lv);
+
+ BE_TIMER_POP(t_live);
+}
+
+
+void be_liveness_free(be_lv_t *lv)
+{
+ be_liveness_invalidate(lv);
+#ifdef USE_LIVE_CHK
+ lv_chk_free(lv->lvc);
+ dfs_free(lv->dfs);
+#endif
+ xfree(lv);
+}
+
+void be_liveness_remove(be_lv_t *lv, const ir_node *irn)
+{
+ if (lv->nodes) {
+ unsigned idx = get_irn_idx(irn);
+ lv_remove_walker_t w;
+
+ /*
+ * Removes a single irn from the liveness information.
+ * Since an irn can only be live at blocks dominated by the block of its
+ * definition, we only have to process that dominance subtree.
+ */
+ w.lv = lv;
+ w.irn = irn;
+ dom_tree_walk(get_nodes_block(irn), lv_remove_irn_walker, NULL, &w);
+ if(idx < bitset_size(lv->nodes))
+ bitset_clear(lv->nodes, idx);
+ }
+}
+
+void be_liveness_introduce(be_lv_t *lv, ir_node *irn)
+{
+ if (lv->nodes) {
+ struct _lv_walker_t w;
+ w.lv = lv;
+ w.data = bitset_malloc(get_irg_last_idx(lv->irg));
+ liveness_for_node(irn, &w);
+ bitset_free(w.data);
+ }
+}
+
+void be_liveness_update(be_lv_t *lv, ir_node *irn)
+{
+ be_liveness_remove(lv, irn);
+ be_liveness_introduce(lv, irn);
+}
+
+static void lv_check_walker(ir_node *bl, void *data)
+{
+ struct _lv_walker_t *w = data;
+ be_lv_t *lv = w->lv;
+ be_lv_t *fresh = w->data;
+
+ struct _be_lv_info_t *curr = phase_get_irn_data(&lv->ph, bl);
+ struct _be_lv_info_t *fr = phase_get_irn_data(&fresh->ph, bl);
+
+ if(!fr && curr && curr[0].u.head.n_members > 0) {
+ unsigned i;
+
+ ir_fprintf(stderr, "%+F liveness should be empty but current liveness contains:\n", bl);
+ for(i = 0; i < curr[0].u.head.n_members; ++i) {
+ ir_fprintf(stderr, "\t%+F\n", get_idx_irn(lv->irg, curr[1 + i].u.node.idx));
+ }
+ }
+
+ else if(curr) {
+ unsigned n_curr = curr[0].u.head.n_members;
+ unsigned n_fresh = fr[0].u.head.n_members;
+
+ unsigned i;
+
+ if(n_curr != n_fresh) {
+ ir_fprintf(stderr, "%+F: liveness set sizes differ. curr %d, correct %d\n", bl, n_curr, n_fresh);
+
+ ir_fprintf(stderr, "current:\n");
+ for(i = 0; i < n_curr; ++i) {
+ struct _be_lv_info_node_t *n = &curr[1 + i].u.node;
+ ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+ }
+
+ ir_fprintf(stderr, "correct:\n");
+ for(i = 0; i < n_fresh; ++i) {
+ struct _be_lv_info_node_t *n = &fr[1 + i].u.node;
+ ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+ }
+ }
+ }
+}
+
+void be_liveness_check(be_lv_t *lv)
+{
+ struct _lv_walker_t w;
+ be_lv_t *fresh = be_liveness(lv->birg);
+
+ w.lv = lv;
+ w.data = fresh;
+ irg_block_walk_graph(lv->irg, lv_check_walker, NULL, &w);
+ be_liveness_free(fresh);
+}
+
+
+static void lv_dump_block_walker(ir_node *irn, void *data)
+{
+ struct _lv_walker_t *w = data;
+ if(is_Block(irn))
+ lv_dump_block(w->lv, w->data, irn);
+}
+
+
+/* Dump the liveness information for a graph. */
+void be_liveness_dump(const be_lv_t *lv, FILE *f)
+{
+ struct _lv_walker_t w;
+
+ w.lv = (be_lv_t *) lv;
+ w.data = f;
+ irg_block_walk_graph(lv->irg, lv_dump_block_walker, NULL, &w);
+}
+
+/* Dump the liveness information for a graph. */
+void be_liveness_dumpto(const be_lv_t *lv, const char *cls_name)
{
FILE *f;
char buf[128];
- ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", irg, cls_name);
+ ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", lv->irg, cls_name);
if((f = fopen(buf, "wt")) != NULL) {
- be_liveness_dump(irg, f);
+ be_liveness_dump(lv, f);
fclose(f);
}
}
+/**
+ * Walker: checks the every predecessors of a node dominate
+ * the note.
+ */
static void dom_check(ir_node *irn, void *data)
{
+ int *problem_found = data;
+
if(!is_Block(irn) && irn != get_irg_end(get_irn_irg(irn))) {
int i, n;
ir_node *bl = get_nodes_block(irn);
if(is_Phi(irn))
use_bl = get_Block_cfgpred_block(bl, i);
- if(!block_dominates(def_bl, use_bl)) {
- ir_fprintf(stderr, "%+F in %+F must dominate %+F for user %+F\n", op, def_bl, use_bl, irn);
- assert(0);
+ if(get_irn_opcode(use_bl) != iro_Bad
+ && get_irn_opcode(def_bl) != iro_Bad
+ && !block_dominates(def_bl, use_bl)) {
+ ir_fprintf(stderr, "Verify warning: %+F in %+F must dominate %+F for user %+F (%s)\n", op, def_bl, use_bl, irn, get_irg_dump_name(get_irn_irg(op)));
+ *problem_found = 1;
+ }
+ }
+ }
+}
+
+/* Check, if the SSA dominance property is fulfilled. */
+int be_check_dominance(ir_graph *irg)
+{
+ int problem_found = 0;
+
+ assure_doms(irg);
+ irg_walk_graph(irg, dom_check, NULL, &problem_found);
+
+ return !problem_found;
+}
+
+void be_liveness_transfer(const arch_register_class_t *cls,
+ ir_node *node, ir_nodeset_t *nodeset)
+{
+ int i, arity;
+
+ /* You should better break out of your loop when hitting the first phi
+ * function. */
+ assert(!is_Phi(node) && "liveness_transfer produces invalid results for phi nodes");
+
+ if (get_irn_mode(node) == mode_T) {
+ const ir_edge_t *edge;
+
+ foreach_out_edge(node, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+
+ if (arch_irn_consider_in_reg_alloc(cls, proj)) {
+ ir_nodeset_remove(nodeset, proj);
+ }
+ }
+ } else if (arch_irn_consider_in_reg_alloc(cls, node)) {
+ ir_nodeset_remove(nodeset, node);
+ }
+
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; ++i) {
+ ir_node *op = get_irn_n(node, i);
+
+ if (arch_irn_consider_in_reg_alloc(cls, op))
+ ir_nodeset_insert(nodeset, op);
+ }
+}
+
+
+
+void be_liveness_end_of_block(const be_lv_t *lv,
+ const arch_register_class_t *cls,
+ const ir_node *block, ir_nodeset_t *live)
+{
+ int i;
+
+ assert(lv->nodes && "live sets must be computed");
+ be_lv_foreach(lv, block, be_lv_state_end, i) {
+ ir_node *node = be_lv_get_irn(lv, block, i);
+ if (!arch_irn_consider_in_reg_alloc(cls, node))
+ continue;
+
+ ir_nodeset_insert(live, node);
+ }
+}
+
+
+
+void be_liveness_nodes_live_at(const be_lv_t *lv,
+ const arch_register_class_t *cls,
+ const ir_node *pos, ir_nodeset_t *live)
+{
+ const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+ ir_node *irn;
+
+ be_liveness_end_of_block(lv, cls, bl, live);
+ sched_foreach_reverse(bl, irn) {
+ /*
+ * If we encounter the node we want to insert the Perm after,
+ * exit immediately, so that this node is still live
+ */
+ if(irn == pos)
+ return;
+
+ be_liveness_transfer(cls, irn, live);
+ }
+}
+
+static void collect_node(ir_node *irn, void *data)
+{
+ struct obstack *obst = data;
+ obstack_ptr_grow(obst, irn);
+}
+
+void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc)
+{
+ ir_graph *irg = lv->irg;
+
+ struct obstack obst;
+ ir_node **nodes;
+ ir_node **blocks;
+ int i, j;
+
+ obstack_init(&obst);
+
+ irg_block_walk_graph(irg, collect_node, NULL, &obst);
+ obstack_ptr_grow(&obst, NULL);
+ blocks = obstack_finish(&obst);
+
+ irg_walk_graph(irg, collect_node, NULL, &obst);
+ obstack_ptr_grow(&obst, NULL);
+ nodes = obstack_finish(&obst);
+
+ stat_ev_ctx_push("be_lv_chk_compare");
+ for (j = 0; nodes[j]; ++j) {
+ ir_node *irn = nodes[j];
+ for (i = 0; blocks[i]; ++i) {
+ ir_node *bl = blocks[i];
+
+ if (!is_Block(irn)) {
+ int lvr_in = be_is_live_in (lv, bl, irn);
+ int lvr_out = be_is_live_out(lv, bl, irn);
+ int lvr_end = be_is_live_end(lv, bl, irn);
+
+ int lvc_in = lv_chk_bl_in (lvc, bl, irn);
+ int lvc_out = lv_chk_bl_out(lvc, bl, irn);
+ int lvc_end = lv_chk_bl_end(lvc, bl, irn);
+
+ if (lvr_in - lvc_in != 0)
+ ir_fprintf(stderr, "live in info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_in, lvc_in);
+
+ if (lvr_end - lvc_end != 0)
+ ir_fprintf(stderr, "live end info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_end, lvc_end);
+
+ if (lvr_out - lvc_out != 0)
+ ir_fprintf(stderr, "live out info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_out, lvc_out);
}
}
}
+ stat_ev_ctx_pop("be_lv_chk_compare");
+
+ obstack_free(&obst, NULL);
}
-void be_check_dominance(ir_graph *irg)
+void be_init_live(void)
{
- irg_walk_graph(irg, dom_check, NULL, NULL);
+ FIRM_DBG_REGISTER(dbg, "firm.be.liveness");
}
+
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_live);
projects / libfirm / blobdiff