X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fana%2Firdom.c;h=7e6f712dc325ac8e9027dc87833866155d2180f2;hb=ac384815dc66fb1846385515a19404ad89b897de;hp=0063f4f038fc54a525abbcc588978de65c7e3b30;hpb=974215da1a935f250766874d0f7a7ddfa34bc4ef;p=libfirm diff --git a/ir/ana/irdom.c b/ir/ana/irdom.c index 0063f4f03..7e6f712dc 100644 --- a/ir/ana/irdom.c +++ b/ir/ana/irdom.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved. + * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. * * This file is part of libFirm. * @@ -24,23 +24,19 @@ * @date 2.2002 * @version $Id$ */ -#ifdef HAVE_CONFIG_H #include "config.h" -#endif -#ifdef HAVE_STRING_H #include -#endif #include "irouts.h" #include "xmalloc.h" #include "irgwalk.h" #include "irdom_t.h" -#include "irgraph_t.h" /* To access state field. */ +#include "irgraph_t.h" #include "irnode_t.h" #include "ircons_t.h" -#include "array.h" +#include "array_t.h" #include "iredges.h" @@ -51,19 +47,22 @@ /** Accessing the dominator and post dominator data structures **/ /*--------------------------------------------------------------------*/ -ir_node *get_Block_idom(const ir_node *bl) { +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; } -void set_Block_idom(ir_node *bl, ir_node *n) { +void set_Block_idom(ir_node *bl, ir_node *n) +{ ir_dom_info *bli = get_dom_info(bl); - assert(get_irn_op(bl) == op_Block); + assert(is_Block(bl)); /* Set the immediate dominator of bl to n */ bli->idom = n; @@ -72,7 +71,7 @@ void set_Block_idom(ir_node *bl, ir_node *n) { * If we don't set the root of the dominator tree * Append bl to the dominates queue of n. */ - if(n != NULL) { + if (n != NULL) { ir_dom_info *ni = get_dom_info(n); bli->next = ni->first; @@ -80,19 +79,22 @@ void set_Block_idom(ir_node *bl, ir_node *n) { } } -ir_node *get_Block_ipostdom(const ir_node *bl) { +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; } -void set_Block_ipostdom(ir_node *bl, ir_node *n) { +void set_Block_ipostdom(ir_node *bl, ir_node *n) +{ ir_dom_info *bli = get_pdom_info(bl); - assert(get_irn_op(bl) == op_Block); + assert(is_Block(bl)); /* Set the immediate post dominator of bl to n */ bli->idom = n; @@ -101,7 +103,7 @@ void set_Block_ipostdom(ir_node *bl, ir_node *n) { * If we don't set the root of the post dominator tree * Append bl to the post dominates queue of n. */ - if(n != NULL) { + if (n != NULL) { ir_dom_info *ni = get_pdom_info(n); bli->next = ni->first; @@ -109,44 +111,52 @@ void set_Block_ipostdom(ir_node *bl, ir_node *n) { } } -int get_Block_dom_pre_num(const ir_node *bl) { - assert(get_irn_op(bl) == op_Block); +int get_Block_dom_pre_num(const ir_node *bl) +{ + assert(is_Block(bl)); return get_dom_info(bl)->pre_num; } -void set_Block_dom_pre_num(ir_node *bl, int num) { - assert(get_irn_op(bl) == op_Block); +void set_Block_dom_pre_num(ir_node *bl, int num) +{ + assert(is_Block(bl)); get_dom_info(bl)->pre_num = num; } -int get_Block_dom_depth(const ir_node *bl) { - assert(get_irn_op(bl) == op_Block); +int get_Block_dom_depth(const ir_node *bl) +{ + assert(is_Block(bl)); return get_dom_info(bl)->dom_depth; } -void set_Block_dom_depth(ir_node *bl, int depth) { - assert(get_irn_op(bl) == op_Block); +void set_Block_dom_depth(ir_node *bl, int depth) +{ + assert(is_Block(bl)); get_dom_info(bl)->dom_depth = depth; } -int get_Block_postdom_pre_num(const ir_node *bl) { - assert(get_irn_op(bl) == op_Block); +int get_Block_postdom_pre_num(const ir_node *bl) +{ + assert(is_Block(bl)); return get_pdom_info(bl)->pre_num; } -void set_Block_postdom_pre_num(ir_node *bl, int num) { - assert(get_irn_op(bl) == op_Block); +void set_Block_postdom_pre_num(ir_node *bl, int num) +{ + assert(is_Block(bl)); get_pdom_info(bl)->pre_num = num; } -int get_Block_postdom_depth(const ir_node *bl) { - assert(get_irn_op(bl) == op_Block); +int get_Block_postdom_depth(const ir_node *bl) +{ + assert(is_Block(bl)); return get_pdom_info(bl)->dom_depth; } -void set_Block_postdom_depth(ir_node *bl, int depth) { - assert(get_irn_op(bl) == op_Block); +void set_Block_postdom_depth(ir_node *bl, int depth) +{ + assert(is_Block(bl)); get_pdom_info(bl)->dom_depth = depth; } @@ -189,6 +199,12 @@ int block_dominates(const ir_node *a, const ir_node *b) 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) { @@ -305,6 +321,13 @@ int block_postdominates(const ir_node *a, const ir_node *b) 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) { @@ -326,14 +349,14 @@ void dom_tree_walk(ir_node *bl, irg_walk_func *pre, { ir_node *p; - if(pre) + if (pre) pre(bl, env); dominates_for_each(bl, p) { dom_tree_walk(p, pre, post, env); } - if(post) + if (post) post(bl, env); } @@ -343,14 +366,14 @@ void postdom_tree_walk(ir_node *bl, irg_walk_func *pre, { ir_node *p; - if(pre) + if (pre) pre(bl, env); postdominates_for_each(bl, p) { postdom_tree_walk(p, pre, post, env); } - if(post) + if (post) post(bl, env); } @@ -361,7 +384,7 @@ void dom_tree_walk_irg(ir_graph *irg, irg_walk_func *pre, /* 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(is_irg_state(irg, IR_GRAPH_STATE_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 @@ -373,10 +396,10 @@ void dom_tree_walk_irg(ir_graph *irg, irg_walk_func *pre, 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(is_irg_state(irg, IR_GRAPH_STATE_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 @@ -387,7 +410,7 @@ void postdom_tree_walk_irg(ir_graph *irg, irg_walk_func *pre, 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)++; @@ -399,8 +422,9 @@ static void assign_tree_dom_pre_order_max(ir_node *bl, void *data) ir_node *p; unsigned max = 0; unsigned children = 0; + (void) data; - for(p = bi->first; p; p = get_dom_info(p)->next) { + for (p = bi->first; p; p = get_dom_info(p)->next) { unsigned max_p = get_dom_info(p)->max_subtree_pre_num; max = max > max_p ? max : max_p; children++; @@ -412,7 +436,7 @@ static void assign_tree_dom_pre_order_max(ir_node *bl, void *data) 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)++; @@ -424,8 +448,9 @@ static void assign_tree_postdom_pre_order_max(ir_node *bl, void *data) ir_node *p; unsigned max = 0; unsigned children = 0; + (void) data; - for(p = bi->first; p; p = get_pdom_info(p)->next) { + for (p = bi->first; p; p = get_pdom_info(p)->next) { unsigned max_p = get_pdom_info(p)->max_subtree_pre_num; max = max > max_p ? max : max_p; children++; @@ -442,8 +467,10 @@ static void assign_tree_postdom_pre_order_max(ir_node *bl, void *data) /** * count the number of blocks and clears the post dominance info */ -static void count_and_init_blocks_pdom(ir_node *bl, void *env) { +static void count_and_init_blocks_pdom(ir_node *bl, void *env) +{ int *n_blocks = (int *) env; + (*n_blocks) ++; memset(get_pdom_info(bl), 0, sizeof(ir_dom_info)); @@ -482,12 +509,13 @@ typedef struct { * Start block misses control dead blocks. */ static void init_tmp_dom_info(ir_node *bl, tmp_dom_info *parent, - tmp_dom_info *tdi_list, int *used, int n_blocks) { + tmp_dom_info *tdi_list, int *used, int n_blocks) +{ tmp_dom_info *tdi; int i; assert(is_Block(bl)); - if (get_irg_block_visited(current_ir_graph) == get_Block_block_visited(bl)) + if (Block_block_visited(bl)) return; mark_Block_block_visited(bl); set_Block_dom_pre_num(bl, *used); @@ -506,7 +534,11 @@ static void init_tmp_dom_info(ir_node *bl, tmp_dom_info *parent, /* Iterate */ for (i = get_Block_n_cfg_outs_ka(bl) - 1; i >= 0; --i) { ir_node *pred = get_Block_cfg_out_ka(bl, i); - assert(is_Block(pred)); + /* can happen for half-optimized dead code (I've seen this in student + projects */ + if (!is_Block(pred)) + continue; + init_tmp_dom_info(pred, tdi, tdi_list, used, n_blocks); } } @@ -516,7 +548,8 @@ static void init_tmp_dom_info(ir_node *bl, tmp_dom_info *parent, * End block misses blocks in endless loops. */ static void init_tmp_pdom_info(ir_node *bl, tmp_dom_info *parent, - tmp_dom_info *tdi_list, int* used, int n_blocks) { + tmp_dom_info *tdi_list, int* used, int n_blocks) +{ tmp_dom_info *tdi; int i; @@ -563,7 +596,8 @@ static void init_tmp_pdom_info(ir_node *bl, tmp_dom_info *parent, } } -static void dom_compress(tmp_dom_info *v) { +static void dom_compress(tmp_dom_info *v) +{ assert (v->ancestor); if (v->ancestor->ancestor) { dom_compress (v->ancestor); @@ -578,22 +612,26 @@ static void dom_compress(tmp_dom_info *v) { * if V is a root, return v, else return the vertex u, not being the * root, with minimum u->semi on the path from v to its root. */ -INLINE static tmp_dom_info *dom_eval(tmp_dom_info *v) { +inline static tmp_dom_info *dom_eval(tmp_dom_info *v) +{ if (!v->ancestor) return v; dom_compress (v); return v->label; } /** make V W's ancestor */ -INLINE static void dom_link(tmp_dom_info *v, tmp_dom_info *w) { +inline static void dom_link(tmp_dom_info *v, tmp_dom_info *w) +{ w->ancestor = v; } /** * Walker: count the number of blocks and clears the dominance info */ -static void count_and_init_blocks_dom(ir_node *bl, void *env) { +static void count_and_init_blocks_dom(ir_node *bl, void *env) +{ int *n_blocks = (int *) env; + (*n_blocks) ++; memset(get_dom_info(bl), 0, sizeof(ir_dom_info)); @@ -602,66 +640,9 @@ static void count_and_init_blocks_dom(ir_node *bl, void *env) { set_Block_dom_depth(bl, -1); } -/** - * Initialize the dominance/postdominance construction: - * - * - count the number of blocks - * - clear the dominance info - * - remove Block-keepalives of live blocks to reduce - * the number of "phantom" block edges - * - * @param irg the graph - * @param pre a walker function that will be called for every block in the graph - */ -static int init_construction(ir_graph *irg, irg_walk_func *pre) { - ir_graph *rem = current_ir_graph; - ir_node *end; - int arity; - int n_blocks = 0; - - current_ir_graph = irg; - - /* this visits only the reachable blocks */ - irg_block_walk(get_irg_end_block(irg), pre, NULL, &n_blocks); - - /* now visit the unreachable (from End) Blocks and remove unnecessary keep-alives */ - end = get_irg_end(irg); - arity = get_End_n_keepalives(end); - if (arity) { /* we have keep-alives */ - ir_node **in; - int i, j; - - NEW_ARR_A(ir_node *, in, arity); - for (i = j = 0; i < arity; i++) { - ir_node *pred = get_End_keepalive(end, i); - - if (get_irn_op(pred) == op_Block) { - if (Block_not_block_visited(pred)) { - /* we found a endless loop */ - dec_irg_block_visited(irg); - irg_block_walk(pred, pre, NULL, &n_blocks); - } - else - continue; - } - in[j++] = pred; - } - if (j != arity) { - /* we kill some Block keep-alives */ - set_End_keepalives(end, j, in); - set_irg_outs_inconsistent(irg); - } - } - - current_ir_graph = rem; - return n_blocks; -} - - -/* 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) { +/* Computes the dominator trees. */ +void compute_doms(ir_graph *irg) +{ ir_graph *rem = current_ir_graph; int n_blocks, used, i, j; tmp_dom_info *tdi_list; /* Ein Golf? */ @@ -670,13 +651,13 @@ void compute_doms(ir_graph *irg) { /* Update graph state */ assert(get_irg_phase_state(irg) != phase_building); - irg->dom_state = dom_consistent; /* Count the number of blocks in the graph. */ - n_blocks = init_construction(irg, count_and_init_blocks_dom); + n_blocks = 0; + irg_block_walk_graph(irg, count_and_init_blocks_dom, NULL, &n_blocks); /* Memory for temporary information. */ - tdi_list = xcalloc(n_blocks, sizeof(tdi_list[0])); + tdi_list = XMALLOCNZ(tmp_dom_info, n_blocks); /* We need the out data structure. */ assure_irg_outs(irg); @@ -694,25 +675,28 @@ void compute_doms(ir_graph *irg) { 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); @@ -720,11 +704,12 @@ void compute_doms(ir_graph *irg) { 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; } } @@ -761,7 +746,8 @@ void compute_doms(ir_graph *irg) { 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 */ @@ -777,30 +763,32 @@ void compute_doms(ir_graph *irg) { /* 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; + set_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE); } -void assure_doms(ir_graph *irg) { - if (get_irg_dom_state(irg) != dom_consistent) +void assure_doms(ir_graph *irg) +{ + if (! is_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE)) compute_doms(irg); } -void free_dom(ir_graph *irg) { +void free_dom(ir_graph *irg) +{ /* Update graph state */ - assert(get_irg_phase_state(current_ir_graph) != phase_building); - current_ir_graph->dom_state = dom_none; + assert(get_irg_phase_state(irg) != phase_building); + clear_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE); /* With the implementation right now there is nothing to free, but better call it anyways... */ } -/* 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) { +/* Computes the post dominator trees. */ +void compute_postdoms(ir_graph *irg) +{ ir_graph *rem = current_ir_graph; int n_blocks, used, i, j; tmp_dom_info *tdi_list; @@ -809,13 +797,13 @@ void compute_postdoms(ir_graph *irg) { /* Update graph state */ assert(get_irg_phase_state(irg) != phase_building); - irg->pdom_state = dom_consistent; /* Count the number of blocks in the graph. */ - n_blocks = init_construction(irg, count_and_init_blocks_pdom); + n_blocks = 0; + irg_block_walk_graph(irg, count_and_init_blocks_pdom, NULL, &n_blocks); /* Memory for temporary information. */ - tdi_list = xcalloc(n_blocks, sizeof(tdi_list[0])); + tdi_list = XMALLOCNZ(tmp_dom_info, n_blocks); /* We need the out data structure. */ assure_irg_outs(irg); @@ -843,7 +831,7 @@ void compute_postdoms(ir_graph *irg) { 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; @@ -888,21 +876,24 @@ void compute_postdoms(ir_graph *irg) { /* 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; + set_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_POSTDOMINANCE); } -void assure_postdoms(ir_graph *irg) { - if (get_irg_postdom_state(irg) != dom_consistent) +void assure_postdoms(ir_graph *irg) +{ + if (! is_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_POSTDOMINANCE)) compute_postdoms(irg); } -void free_postdom(ir_graph *irg) { +void free_postdom(ir_graph *irg) +{ /* Update graph state */ - assert(get_irg_phase_state(current_ir_graph) != phase_building); - current_ir_graph->pdom_state = dom_none; + assert(get_irg_phase_state(irg) != phase_building); + clear_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_POSTDOMINANCE); /* With the implementation right now there is nothing to free, but better call it anyways... */