#include "irnode_t.h"
#include "irgraph_t.h"
-#include "irprog_t.h"
#include "iroptimize.h"
-#include "ircons_t.h"
#include "iropt_t.h"
#include "irgopt.h"
#include "irgmod.h"
#include "irgwalk.h"
-#include "adt/array.h"
-#include "adt/pset.h"
-#include "adt/pmap.h"
#include "adt/pdeq.h"
-#include "adt/xmalloc.h"
-
-#include "irouts.h"
-#include "irloop_t.h"
-#include "irbackedge_t.h"
-#include "cgana.h"
-#include "trouts.h"
-#include "error.h"
#include "irflag_t.h"
-#include "irhooks.h"
#include "iredges_t.h"
#include "irtools.h"
(void) env;
if (optimized != n) {
- exchange (n, optimized);
+ exchange(n, optimized);
}
}
current_ir_graph = rem;
}
-
-
-/*------------------------------------------------------------------*/
-/* Routines for dead node elimination / copying garbage collection */
-/* of the obstack. */
-/*------------------------------------------------------------------*/
-
-/**
- * Remember the new node in the old node by using a field all nodes have.
- */
-#define set_new_node(oldn, newn) set_irn_link(oldn, newn)
-
-/**
- * Get this new node, before the old node is forgotten.
- */
-#define get_new_node(oldn) get_irn_link(oldn)
-
-/**
- * Check if a new node was set.
- */
-#define has_new_node(n) (get_new_node(n) != NULL)
-
-/**
- * We use the block_visited flag to mark that we have computed the
- * number of useful predecessors for this block.
- * Further we encode the new arity in this flag in the old blocks.
- * Remembering the arity is useful, as it saves a lot of pointer
- * accesses. This function is called for all Phi and Block nodes
- * in a Block.
- */
-static INLINE int
-compute_new_arity(ir_node *b) {
- int i, res, irn_arity;
- int irg_v, block_v;
-
- irg_v = get_irg_block_visited(current_ir_graph);
- block_v = get_Block_block_visited(b);
- if (block_v >= irg_v) {
- /* we computed the number of preds for this block and saved it in the
- block_v flag */
- return block_v - irg_v;
- } else {
- /* compute the number of good predecessors */
- res = irn_arity = get_irn_arity(b);
- for (i = 0; i < irn_arity; i++)
- if (is_Bad(get_irn_n(b, i))) res--;
- /* save it in the flag. */
- set_Block_block_visited(b, irg_v + res);
- return res;
- }
-}
-
-/**
- * Copies the node to the new obstack. The Ins of the new node point to
- * the predecessors on the old obstack. For block/phi nodes not all
- * predecessors might be copied. n->link points to the new node.
- * For Phi and Block nodes the function allocates in-arrays with an arity
- * only for useful predecessors. The arity is determined by counting
- * the non-bad predecessors of the block.
- *
- * @param n The node to be copied
- * @param env if non-NULL, the node number attribute will be copied to the new node
- *
- * Note: Also used for loop unrolling.
- */
-static void copy_node(ir_node *n, void *env) {
- ir_node *nn, *block;
- int new_arity;
- ir_op *op = get_irn_op(n);
- (void) env;
-
- if (op == op_Bad) {
- /* node copied already */
- return;
- } else if (op == op_Block) {
- block = NULL;
- new_arity = compute_new_arity(n);
- n->attr.block.graph_arr = NULL;
- } else {
- block = get_nodes_block(n);
- if (op == op_Phi) {
- new_arity = compute_new_arity(block);
- } else {
- new_arity = get_irn_arity(n);
- }
- }
- nn = new_ir_node(get_irn_dbg_info(n),
- current_ir_graph,
- block,
- op,
- get_irn_mode(n),
- new_arity,
- get_irn_in(n) + 1);
- /* Copy the attributes. These might point to additional data. If this
- was allocated on the old obstack the pointers now are dangling. This
- frees e.g. the memory of the graph_arr allocated in new_immBlock. */
- if (op == op_Block) {
- /* we cannot allow blocks WITHOUT macroblock input */
- set_Block_MacroBlock(nn, get_Block_MacroBlock(n));
- }
- copy_node_attr(n, nn);
-
-#ifdef DEBUG_libfirm
- {
- int copy_node_nr = env != NULL;
- if (copy_node_nr) {
- /* for easier debugging, we want to copy the node numbers too */
- nn->node_nr = n->node_nr;
- }
- }
-#endif
-
- set_new_node(n, nn);
- hook_dead_node_elim_subst(current_ir_graph, n, nn);
-}
-
-/**
- * Copies new predecessors of old node to new node remembered in link.
- * Spare the Bad predecessors of Phi and Block nodes.
- */
-static void copy_preds(ir_node *n, void *env) {
- ir_node *nn, *block;
- int i, j, irn_arity;
- (void) env;
-
- nn = get_new_node(n);
-
- if (is_Block(n)) {
- /* copy the macro block header */
- ir_node *mbh = get_Block_MacroBlock(n);
-
- if (mbh == n) {
- /* this block is a macroblock header */
- set_Block_MacroBlock(nn, nn);
- } else {
- /* get the macro block header */
- ir_node *nmbh = get_new_node(mbh);
- assert(nmbh != NULL);
- set_Block_MacroBlock(nn, nmbh);
- }
-
- /* Don't copy Bad nodes. */
- j = 0;
- irn_arity = get_irn_arity(n);
- for (i = 0; i < irn_arity; i++) {
- if (! is_Bad(get_irn_n(n, i))) {
- ir_node *pred = get_irn_n(n, i);
- set_irn_n(nn, j, get_new_node(pred));
- j++;
- }
- }
- /* repair the block visited flag from above misuse. Repair it in both
- graphs so that the old one can still be used. */
- set_Block_block_visited(nn, 0);
- set_Block_block_visited(n, 0);
- /* Local optimization could not merge two subsequent blocks if
- in array contained Bads. Now it's possible.
- We don't call optimize_in_place as it requires
- that the fields in ir_graph are set properly. */
- if ((get_opt_control_flow_straightening()) &&
- (get_Block_n_cfgpreds(nn) == 1) &&
- is_Jmp(get_Block_cfgpred(nn, 0))) {
- ir_node *old = get_nodes_block(get_Block_cfgpred(nn, 0));
- if (nn == old) {
- /* Jmp jumps into the block it is in -- deal self cycle. */
- assert(is_Bad(get_new_node(get_irg_bad(current_ir_graph))));
- exchange(nn, get_new_node(get_irg_bad(current_ir_graph)));
- } else {
- exchange(nn, old);
- }
- }
- } else if (is_Phi(n) && get_irn_arity(n) > 0) {
- /* Don't copy node if corresponding predecessor in block is Bad.
- The Block itself should not be Bad. */
- block = get_nodes_block(n);
- set_nodes_block(nn, get_new_node(block));
- j = 0;
- irn_arity = get_irn_arity(n);
- for (i = 0; i < irn_arity; i++) {
- if (! is_Bad(get_irn_n(block, i))) {
- ir_node *pred = get_irn_n(n, i);
- set_irn_n(nn, j, get_new_node(pred));
- /*if (is_backedge(n, i)) set_backedge(nn, j);*/
- j++;
- }
- }
- /* If the pre walker reached this Phi after the post walker visited the
- block block_visited is > 0. */
- set_Block_block_visited(get_nodes_block(n), 0);
- /* Compacting the Phi's ins might generate Phis with only one
- predecessor. */
- if (get_irn_arity(nn) == 1)
- exchange(nn, get_irn_n(nn, 0));
- } else {
- irn_arity = get_irn_arity(n);
- for (i = -1; i < irn_arity; i++)
- set_irn_n(nn, i, get_new_node(get_irn_n(n, i)));
- }
- /* Now the new node is complete. We can add it to the hash table for CSE.
- @@@ inlining aborts if we identify End. Why? */
- if (!is_End(nn))
- add_identities(current_ir_graph->value_table, nn);
-}
-
-/**
- * Copies the graph recursively, compacts the keep-alives of the end node.
- *
- * @param irg the graph to be copied
- * @param copy_node_nr If non-zero, the node number will be copied
- */
-static void copy_graph(ir_graph *irg, int copy_node_nr) {
- ir_node *oe, *ne, *ob, *nb, *om, *nm; /* old end, new end, old bad, new bad, old NoMem, new NoMem */
- ir_node *ka; /* keep alive */
- int i, irn_arity;
- unsigned long vfl;
-
- /* Some nodes must be copied by hand, sigh */
- vfl = get_irg_visited(irg);
- set_irg_visited(irg, vfl + 1);
-
- oe = get_irg_end(irg);
- mark_irn_visited(oe);
- /* copy the end node by hand, allocate dynamic in array! */
- ne = new_ir_node(get_irn_dbg_info(oe),
- irg,
- NULL,
- op_End,
- mode_X,
- -1,
- NULL);
- /* Copy the attributes. Well, there might be some in the future... */
- copy_node_attr(oe, ne);
- set_new_node(oe, ne);
-
- /* copy the Bad node */
- ob = get_irg_bad(irg);
- mark_irn_visited(ob);
- nb = new_ir_node(get_irn_dbg_info(ob),
- irg,
- NULL,
- op_Bad,
- mode_T,
- 0,
- NULL);
- copy_node_attr(ob, nb);
- set_new_node(ob, nb);
-
- /* copy the NoMem node */
- om = get_irg_no_mem(irg);
- mark_irn_visited(om);
- nm = new_ir_node(get_irn_dbg_info(om),
- irg,
- NULL,
- op_NoMem,
- mode_M,
- 0,
- NULL);
- copy_node_attr(om, nm);
- set_new_node(om, nm);
-
- /* copy the live nodes */
- set_irg_visited(irg, vfl);
- irg_walk(get_nodes_block(oe), copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
-
- /* Note: from yet, the visited flag of the graph is equal to vfl + 1 */
-
- /* visit the anchors as well */
- for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
- ir_node *n = get_irg_anchor(irg, i);
-
- if (n && (get_irn_visited(n) <= vfl)) {
- set_irg_visited(irg, vfl);
- irg_walk(n, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
- }
- }
-
- /* copy_preds for the end node ... */
- set_nodes_block(ne, get_new_node(get_nodes_block(oe)));
-
- /*- ... and now the keep alives. -*/
- /* First pick the not marked block nodes and walk them. We must pick these
- first as else we will oversee blocks reachable from Phis. */
- irn_arity = get_End_n_keepalives(oe);
- for (i = 0; i < irn_arity; i++) {
- ka = get_End_keepalive(oe, i);
- if (is_Block(ka)) {
- if (get_irn_visited(ka) <= vfl) {
- /* We must keep the block alive and copy everything reachable */
- set_irg_visited(irg, vfl);
- irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
- }
- add_End_keepalive(ne, get_new_node(ka));
- }
- }
-
- /* Now pick other nodes. Here we will keep all! */
- irn_arity = get_End_n_keepalives(oe);
- for (i = 0; i < irn_arity; i++) {
- ka = get_End_keepalive(oe, i);
- if (!is_Block(ka)) {
- if (get_irn_visited(ka) <= vfl) {
- /* We didn't copy the node yet. */
- set_irg_visited(irg, vfl);
- irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
- }
- add_End_keepalive(ne, get_new_node(ka));
- }
- }
-
- /* start block sometimes only reached after keep alives */
- set_nodes_block(nb, get_new_node(get_nodes_block(ob)));
- set_nodes_block(nm, get_new_node(get_nodes_block(om)));
-}
-
-/**
- * Copies the graph reachable from current_ir_graph->end to the obstack
- * in current_ir_graph and fixes the environment.
- * Then fixes the fields in current_ir_graph containing nodes of the
- * graph.
- *
- * @param copy_node_nr If non-zero, the node number will be copied
- */
-static void
-copy_graph_env(int copy_node_nr) {
- ir_graph *irg = current_ir_graph;
- ir_node *old_end, *new_anchor;
- int i;
-
- /* remove end_except and end_reg nodes */
- old_end = get_irg_end(irg);
- set_irg_end_except (irg, old_end);
- set_irg_end_reg (irg, old_end);
-
- /* Not all nodes remembered in irg might be reachable
- from the end node. Assure their link is set to NULL, so that
- we can test whether new nodes have been computed. */
- for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
- ir_node *n = get_irg_anchor(irg, i);
- if (n != NULL)
- set_new_node(n, NULL);
- }
- /* we use the block walk flag for removing Bads from Blocks ins. */
- inc_irg_block_visited(irg);
-
- /* copy the graph */
- copy_graph(irg, copy_node_nr);
-
- /* fix the anchor */
- old_end = get_irg_end(irg);
- new_anchor = new_Anchor(irg);
-
- for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
- ir_node *n = get_irg_anchor(irg, i);
- if (n)
- set_irn_n(new_anchor, i, get_new_node(n));
- }
- free_End(old_end);
- irg->anchor = new_anchor;
-
- /* ensure the new anchor is placed in the endblock */
- set_nodes_block(new_anchor, get_irg_end_block(irg));
-}
-
-/**
- * Copies all reachable nodes to a new obstack. Removes bad inputs
- * from block nodes and the corresponding inputs from Phi nodes.
- * Merges single exit blocks with single entry blocks and removes
- * 1-input Phis.
- * Adds all new nodes to a new hash table for CSE. Does not
- * perform CSE, so the hash table might contain common subexpressions.
- */
-void dead_node_elimination(ir_graph *irg) {
- ir_graph *rem;
-#ifdef INTERPROCEDURAL_VIEW
- int rem_ipview = get_interprocedural_view();
-#endif
- struct obstack *graveyard_obst = NULL;
- struct obstack *rebirth_obst = NULL;
- assert(! edges_activated(irg) && "dead node elimination requires disabled edges");
-
- /* inform statistics that we started a dead-node elimination run */
- hook_dead_node_elim(irg, 1);
-
- /* Remember external state of current_ir_graph. */
- rem = current_ir_graph;
- current_ir_graph = irg;
-#ifdef INTERPROCEDURAL_VIEW
- set_interprocedural_view(0);
-#endif
-
- assert(get_irg_phase_state(irg) != phase_building);
-
- /* Handle graph state */
- free_callee_info(irg);
- free_irg_outs(irg);
- free_trouts();
-
- /* @@@ so far we loose loops when copying */
- free_loop_information(irg);
-
- set_irg_doms_inconsistent(irg);
-
- /* A quiet place, where the old obstack can rest in peace,
- until it will be cremated. */
- graveyard_obst = irg->obst;
-
- /* A new obstack, where the reachable nodes will be copied to. */
- rebirth_obst = xmalloc(sizeof(*rebirth_obst));
- irg->obst = rebirth_obst;
- obstack_init(irg->obst);
- irg->last_node_idx = 0;
-
- /* We also need a new value table for CSE */
- del_identities(irg->value_table);
- irg->value_table = new_identities();
-
- /* Copy the graph from the old to the new obstack */
- copy_graph_env(/*copy_node_nr=*/1);
-
- /* Free memory from old unoptimized obstack */
- obstack_free(graveyard_obst, 0); /* First empty the obstack ... */
- xfree(graveyard_obst); /* ... then free it. */
-
- /* inform statistics that the run is over */
- hook_dead_node_elim(irg, 0);
-
- current_ir_graph = rem;
-#ifdef INTERPROCEDURAL_VIEW
- set_interprocedural_view(rem_ipview);
-#endif
-}
-
-/**
- * Relink bad predecessors of a block and store the old in array to the
- * link field. This function is called by relink_bad_predecessors().
- * The array of link field starts with the block operand at position 0.
- * If block has bad predecessors, create a new in array without bad preds.
- * Otherwise let in array untouched.
- */
-static void relink_bad_block_predecessors(ir_node *n, void *env) {
- ir_node **new_in, *irn;
- int i, new_irn_n, old_irn_arity, new_irn_arity = 0;
- (void) env;
-
- /* if link field of block is NULL, look for bad predecessors otherwise
- this is already done */
- if (is_Block(n) && get_irn_link(n) == NULL) {
- /* save old predecessors in link field (position 0 is the block operand)*/
- set_irn_link(n, get_irn_in(n));
-
- /* count predecessors without bad nodes */
- old_irn_arity = get_irn_arity(n);
- for (i = 0; i < old_irn_arity; i++)
- if (!is_Bad(get_irn_n(n, i)))
- ++new_irn_arity;
-
- /* arity changing: set new predecessors without bad nodes */
- if (new_irn_arity < old_irn_arity) {
- /* Get new predecessor array. We do not resize the array, as we must
- keep the old one to update Phis. */
- new_in = NEW_ARR_D(ir_node *, current_ir_graph->obst, (new_irn_arity+1));
-
- /* set new predecessors in array */
- new_in[0] = NULL;
- new_irn_n = 1;
- for (i = 0; i < old_irn_arity; i++) {
- irn = get_irn_n(n, i);
- if (!is_Bad(irn)) {
- new_in[new_irn_n] = irn;
- is_backedge(n, i) ? set_backedge(n, new_irn_n-1) : set_not_backedge(n, new_irn_n-1);
- ++new_irn_n;
- }
- }
- /* ARR_SETLEN(int, n->attr.block.backedge, new_irn_arity); */
- ARR_SHRINKLEN(n->attr.block.backedge, new_irn_arity);
- n->in = new_in;
- } /* ir node has bad predecessors */
- } /* Block is not relinked */
-}
-
-/**
- * Relinks Bad predecessors from Blocks and Phis called by walker
- * remove_bad_predecesors(). If n is a Block, call
- * relink_bad_block_redecessors(). If n is a Phi-node, call also the relinking
- * function of Phi's Block. If this block has bad predecessors, relink preds
- * of the Phi-node.
- */
-static void relink_bad_predecessors(ir_node *n, void *env) {
- ir_node *block, **old_in;
- int i, old_irn_arity, new_irn_arity;
-
- /* relink bad predecessors of a block */
- if (is_Block(n))
- relink_bad_block_predecessors(n, env);
-
- /* If Phi node relink its block and its predecessors */
- if (is_Phi(n)) {
- /* Relink predecessors of phi's block */
- block = get_nodes_block(n);
- if (get_irn_link(block) == NULL)
- relink_bad_block_predecessors(block, env);
-
- old_in = (ir_node **)get_irn_link(block); /* Of Phi's Block */
- old_irn_arity = ARR_LEN(old_in);
-
- /* Relink Phi predecessors if count of predecessors changed */
- if (old_irn_arity != ARR_LEN(get_irn_in(block))) {
- /* set new predecessors in array
- n->in[0] remains the same block */
- new_irn_arity = 1;
- for(i = 1; i < old_irn_arity; i++)
- if (!is_Bad(old_in[i])) {
- n->in[new_irn_arity] = n->in[i];
- is_backedge(n, i) ? set_backedge(n, new_irn_arity) : set_not_backedge(n, new_irn_arity);
- ++new_irn_arity;
- }
-
- ARR_SETLEN(ir_node *, n->in, new_irn_arity);
- ARR_SETLEN(int, n->attr.phi.u.backedge, new_irn_arity);
- }
- } /* n is a Phi node */
-}
-
-/*
- * Removes Bad Bad predecessors from Blocks and the corresponding
- * inputs to Phi nodes as in dead_node_elimination but without
- * copying the graph.
- * On walking up set the link field to NULL, on walking down call
- * relink_bad_predecessors() (This function stores the old in array
- * to the link field and sets a new in array if arity of predecessors
- * changes).
- */
-void remove_bad_predecessors(ir_graph *irg) {
- panic("Fix backedge handling first");
- irg_walk_graph(irg, firm_clear_link, relink_bad_predecessors, NULL);
-}
-
-
-/*
- __ _ __ __
- (_ __ o _ | \/ |_
- __)|_| | \_/ | \_/(/_ |_/\__|__
-
- The following stuff implements a facility that automatically patches
- registered ir_node pointers to the new node when a dead node elimination occurs.
-*/
-
-struct _survive_dce_t {
- struct obstack obst;
- pmap *places;
- pmap *new_places;
- hook_entry_t dead_node_elim;
- hook_entry_t dead_node_elim_subst;
-};
-
-typedef struct _survive_dce_list_t {
- struct _survive_dce_list_t *next;
- ir_node **place;
-} survive_dce_list_t;
-
-static void dead_node_hook(void *context, ir_graph *irg, int start) {
- survive_dce_t *sd = context;
- (void) irg;
-
- /* Create a new map before the dead node elimination is performed. */
- if (start) {
- sd->new_places = pmap_create_ex(pmap_count(sd->places));
- } else {
- /* Patch back all nodes if dead node elimination is over and something is to be done. */
- pmap_destroy(sd->places);
- sd->places = sd->new_places;
- sd->new_places = NULL;
- }
-}
-
-/**
- * Hook called when dead node elimination replaces old by nw.
- */
-static void dead_node_subst_hook(void *context, ir_graph *irg, ir_node *old, ir_node *nw) {
- survive_dce_t *sd = context;
- survive_dce_list_t *list = pmap_get(sd->places, old);
- (void) irg;
-
- /* If the node is to be patched back, write the new address to all registered locations. */
- if (list) {
- survive_dce_list_t *p;
-
- for (p = list; p; p = p->next)
- *(p->place) = nw;
-
- pmap_insert(sd->new_places, nw, list);
- }
-}
-
-/**
- * Make a new Survive DCE environment.
- */
-survive_dce_t *new_survive_dce(void) {
- survive_dce_t *res = xmalloc(sizeof(res[0]));
- obstack_init(&res->obst);
- res->places = pmap_create();
- res->new_places = NULL;
-
- res->dead_node_elim.hook._hook_dead_node_elim = dead_node_hook;
- res->dead_node_elim.context = res;
- res->dead_node_elim.next = NULL;
-
- res->dead_node_elim_subst.hook._hook_dead_node_elim_subst = dead_node_subst_hook;
- res->dead_node_elim_subst.context = res;
- res->dead_node_elim_subst.next = NULL;
-
-#ifndef FIRM_ENABLE_HOOKS
- assert(0 && "need hooks enabled");
-#endif
-
- register_hook(hook_dead_node_elim, &res->dead_node_elim);
- register_hook(hook_dead_node_elim_subst, &res->dead_node_elim_subst);
- return res;
-}
-
-/**
- * Free a Survive DCE environment.
- */
-void free_survive_dce(survive_dce_t *sd) {
- obstack_free(&sd->obst, NULL);
- pmap_destroy(sd->places);
- unregister_hook(hook_dead_node_elim, &sd->dead_node_elim);
- unregister_hook(hook_dead_node_elim_subst, &sd->dead_node_elim_subst);
- xfree(sd);
-}
-
-/**
- * Register a node pointer to be patched upon DCE.
- * When DCE occurs, the node pointer specified by @p place will be
- * patched to the new address of the node it is pointing to.
- *
- * @param sd The Survive DCE environment.
- * @param place The address of the node pointer.
- */
-void survive_dce_register_irn(survive_dce_t *sd, ir_node **place) {
- if (*place != NULL) {
- ir_node *irn = *place;
- survive_dce_list_t *curr = pmap_get(sd->places, irn);
- survive_dce_list_t *nw = obstack_alloc(&sd->obst, sizeof(nw[0]));
-
- nw->next = curr;
- nw->place = place;
-
- pmap_insert(sd->places, irn, nw);
- }
-}
-
-/*--------------------------------------------------------------------*/
-/* Functionality for inlining */
-/*--------------------------------------------------------------------*/
-
-/**
- * Copy node for inlineing. Updates attributes that change when
- * inlineing but not for dead node elimination.
- *
- * Copies the node by calling copy_node() and then updates the entity if
- * it's a local one. env must be a pointer of the frame type of the
- * inlined procedure. The new entities must be in the link field of
- * the entities.
- */
-static INLINE void
-copy_node_inline(ir_node *n, void *env) {
- ir_node *nn;
- ir_type *frame_tp = (ir_type *)env;
-
- copy_node(n, NULL);
- if (is_Sel(n)) {
- nn = get_new_node (n);
- assert(is_Sel(nn));
- if (get_entity_owner(get_Sel_entity(n)) == frame_tp) {
- set_Sel_entity(nn, get_entity_link(get_Sel_entity(n)));
- }
- } else if (is_Block(n)) {
- nn = get_new_node (n);
- nn->attr.block.irg = current_ir_graph;
- }
-}
-
-/**
- * Walker: checks if P_value_arg_base is used.
- */
-static void find_addr(ir_node *node, void *env) {
- int *allow_inline = env;
- if (is_Proj(node) &&
- is_Start(get_Proj_pred(node)) &&
- get_Proj_proj(node) == pn_Start_P_value_arg_base) {
- *allow_inline = 0;
- }
-}
-
-/**
- * Check if we can inline a given call.
- * Currently, we cannot inline two cases:
- * - call with compound arguments
- * - graphs that take the address of a parameter
- *
- * check these conditions here
- */
-static int can_inline(ir_node *call, ir_graph *called_graph) {
- ir_type *call_type = get_Call_type(call);
- int params, ress, i, res;
- assert(is_Method_type(call_type));
-
- params = get_method_n_params(call_type);
- ress = get_method_n_ress(call_type);
-
- /* check parameters for compound arguments */
- for (i = 0; i < params; ++i) {
- ir_type *p_type = get_method_param_type(call_type, i);
-
- if (is_compound_type(p_type))
- return 0;
- }
-
- /* check results for compound arguments */
- for (i = 0; i < ress; ++i) {
- ir_type *r_type = get_method_res_type(call_type, i);
-
- if (is_compound_type(r_type))
- return 0;
- }
-
- res = 1;
- irg_walk_graph(called_graph, find_addr, NULL, &res);
-
- return res;
-}
-
-enum exc_mode {
- exc_handler = 0, /**< There is a handler. */
- exc_to_end = 1, /**< Branches to End. */
- exc_no_handler = 2 /**< Exception handling not represented. */
-};
-
-/* Inlines a method at the given call site. */
-int inline_method(ir_node *call, ir_graph *called_graph) {
- ir_node *pre_call;
- ir_node *post_call, *post_bl;
- ir_node *in[pn_Start_max];
- ir_node *end, *end_bl;
- ir_node **res_pred;
- ir_node **cf_pred;
- ir_node *ret, *phi;
- int arity, n_ret, n_exc, n_res, i, n, j, rem_opt, irn_arity;
- enum exc_mode exc_handling;
- ir_type *called_frame, *curr_frame;
- irg_inline_property prop = get_irg_inline_property(called_graph);
- ir_entity *ent;
-
- if (prop == irg_inline_forbidden)
- return 0;
-
- ent = get_irg_entity(called_graph);
-
- /* Do not inline variadic functions. */
- if (get_method_variadicity(get_entity_type(ent)) == variadicity_variadic)
- return 0;
-
- assert(get_method_n_params(get_entity_type(ent)) ==
- get_method_n_params(get_Call_type(call)));
-
- /*
- * We cannot inline a recursive call. The graph must be copied before
- * the call the inline_method() using create_irg_copy().
- */
- if (called_graph == current_ir_graph)
- return 0;
-
- /*
- * currently, we cannot inline two cases:
- * - call with compound arguments
- * - graphs that take the address of a parameter
- */
- if (! can_inline(call, called_graph))
- return 0;
-
- /* -- Turn off optimizations, this can cause problems when allocating new nodes. -- */
- rem_opt = get_opt_optimize();
- set_optimize(0);
-
- /* Handle graph state */
- assert(get_irg_phase_state(current_ir_graph) != phase_building);
- assert(get_irg_pinned(current_ir_graph) == op_pin_state_pinned);
- assert(get_irg_pinned(called_graph) == op_pin_state_pinned);
- set_irg_outs_inconsistent(current_ir_graph);
- set_irg_extblk_inconsistent(current_ir_graph);
- set_irg_doms_inconsistent(current_ir_graph);
- set_irg_loopinfo_inconsistent(current_ir_graph);
- set_irg_callee_info_state(current_ir_graph, irg_callee_info_inconsistent);
-
- /* -- Check preconditions -- */
- assert(is_Call(call));
-
- /* here we know we WILL inline, so inform the statistics */
- hook_inline(call, called_graph);
-
- /* -- Decide how to handle exception control flow: Is there a handler
- for the Call node, or do we branch directly to End on an exception?
- exc_handling:
- 0 There is a handler.
- 1 Branches to End.
- 2 Exception handling not represented in Firm. -- */
- {
- ir_node *proj, *Mproj = NULL, *Xproj = NULL;
- for (proj = get_irn_link(call); proj; proj = get_irn_link(proj)) {
- long proj_nr = get_Proj_proj(proj);
- if (proj_nr == pn_Call_X_except) Xproj = proj;
- if (proj_nr == pn_Call_M_except) Mproj = proj;
- }
- if (Mproj) { assert(Xproj); exc_handling = exc_handler; } /* Mproj */
- else if (Xproj) { exc_handling = exc_to_end; } /* !Mproj && Xproj */
- else { exc_handling = exc_no_handler; } /* !Mproj && !Xproj */
- }
-
- /* --
- the procedure and later replaces the Start node of the called graph.
- Post_call is the old Call node and collects the results of the called
- graph. Both will end up being a tuple. -- */
- post_bl = get_nodes_block(call);
- set_irg_current_block(current_ir_graph, post_bl);
- /* XxMxPxPxPxT of Start + parameter of Call */
- in[pn_Start_X_initial_exec] = new_Jmp();
- in[pn_Start_M] = get_Call_mem(call);
- in[pn_Start_P_frame_base] = get_irg_frame(current_ir_graph);
- in[pn_Start_P_globals] = get_irg_globals(current_ir_graph);
- in[pn_Start_P_tls] = get_irg_tls(current_ir_graph);
- in[pn_Start_T_args] = new_Tuple(get_Call_n_params(call), get_Call_param_arr(call));
- /* in[pn_Start_P_value_arg_base] = ??? */
- assert(pn_Start_P_value_arg_base == pn_Start_max - 1 && "pn_Start_P_value_arg_base not supported, fix");
- pre_call = new_Tuple(pn_Start_max - 1, in);
- post_call = call;
-
- /* --
- The new block gets the ins of the old block, pre_call and all its
- predecessors and all Phi nodes. -- */
- part_block(pre_call);
-
- /* -- Prepare state for dead node elimination -- */
- /* Visited flags in calling irg must be >= flag in called irg.
- Else walker and arity computation will not work. */
- if (get_irg_visited(current_ir_graph) <= get_irg_visited(called_graph))
- set_irg_visited(current_ir_graph, get_irg_visited(called_graph)+1);
- if (get_irg_block_visited(current_ir_graph)< get_irg_block_visited(called_graph))
- set_irg_block_visited(current_ir_graph, get_irg_block_visited(called_graph));
- /* Set pre_call as new Start node in link field of the start node of
- calling graph and pre_calls block as new block for the start block
- of calling graph.
- Further mark these nodes so that they are not visited by the
- copying. */
- set_irn_link(get_irg_start(called_graph), pre_call);
- set_irn_visited(get_irg_start(called_graph), get_irg_visited(current_ir_graph));
- set_irn_link(get_irg_start_block(called_graph), get_nodes_block(pre_call));
- set_irn_visited(get_irg_start_block(called_graph), get_irg_visited(current_ir_graph));
- set_irn_link(get_irg_bad(called_graph), get_irg_bad(current_ir_graph));
- set_irn_visited(get_irg_bad(called_graph), get_irg_visited(current_ir_graph));
-
- /* Initialize for compaction of in arrays */
- inc_irg_block_visited(current_ir_graph);
-
- /* -- Replicate local entities of the called_graph -- */
- /* copy the entities. */
- called_frame = get_irg_frame_type(called_graph);
- curr_frame = get_irg_frame_type(current_ir_graph);
- for (i = 0, n = get_class_n_members(called_frame); i < n; ++i) {
- ir_entity *new_ent, *old_ent;
- old_ent = get_class_member(called_frame, i);
- new_ent = copy_entity_own(old_ent, curr_frame);
- set_entity_link(old_ent, new_ent);
- }
-
- /* visited is > than that of called graph. With this trick visited will
- remain unchanged so that an outer walker, e.g., searching the call nodes
- to inline, calling this inline will not visit the inlined nodes. */
- set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
-
- /* -- Performing dead node elimination inlines the graph -- */
- /* Copies the nodes to the obstack of current_ir_graph. Updates links to new
- entities. */
- irg_walk(get_irg_end(called_graph), copy_node_inline, copy_preds,
- get_irg_frame_type(called_graph));
-
- /* Repair called_graph */
- set_irg_visited(called_graph, get_irg_visited(current_ir_graph));
- set_irg_block_visited(called_graph, get_irg_block_visited(current_ir_graph));
- set_Block_block_visited(get_irg_start_block(called_graph), 0);
-
- /* -- Merge the end of the inlined procedure with the call site -- */
- /* We will turn the old Call node into a Tuple with the following
- predecessors:
- -1: Block of Tuple.
- 0: Phi of all Memories of Return statements.
- 1: Jmp from new Block that merges the control flow from all exception
- predecessors of the old end block.
- 2: Tuple of all arguments.
- 3: Phi of Exception memories.
- In case the old Call directly branches to End on an exception we don't
- need the block merging all exceptions nor the Phi of the exception
- memories.
- */
-
- /* -- Precompute some values -- */
- end_bl = get_new_node(get_irg_end_block(called_graph));
- end = get_new_node(get_irg_end(called_graph));
- arity = get_irn_arity(end_bl); /* arity = n_exc + n_ret */
- n_res = get_method_n_ress(get_Call_type(call));
-
- res_pred = xmalloc(n_res * sizeof(*res_pred));
- cf_pred = xmalloc(arity * sizeof(*res_pred));
-
- set_irg_current_block(current_ir_graph, post_bl); /* just to make sure */
-
- /* -- archive keepalives -- */
- irn_arity = get_irn_arity(end);
- for (i = 0; i < irn_arity; i++) {
- ir_node *ka = get_End_keepalive(end, i);
- if (! is_Bad(ka))
- add_End_keepalive(get_irg_end(current_ir_graph), ka);
- }
-
- /* The new end node will die. We need not free as the in array is on the obstack:
- copy_node() only generated 'D' arrays. */
-
- /* -- Replace Return nodes by Jump nodes. -- */
- n_ret = 0;
- for (i = 0; i < arity; i++) {
- ir_node *ret;
- ret = get_irn_n(end_bl, i);
- if (is_Return(ret)) {
- cf_pred[n_ret] = new_r_Jmp(current_ir_graph, get_nodes_block(ret));
- n_ret++;
- }
- }
- set_irn_in(post_bl, n_ret, cf_pred);
-
- /* -- Build a Tuple for all results of the method.
- Add Phi node if there was more than one Return. -- */
- turn_into_tuple(post_call, pn_Call_max);
- /* First the Memory-Phi */
- n_ret = 0;
- for (i = 0; i < arity; i++) {
- ret = get_irn_n(end_bl, i);
- if (is_Return(ret)) {
- cf_pred[n_ret] = get_Return_mem(ret);
- n_ret++;
- }
- }
- phi = new_Phi(n_ret, cf_pred, mode_M);
- set_Tuple_pred(call, pn_Call_M_regular, phi);
- /* Conserve Phi-list for further inlinings -- but might be optimized */
- if (get_nodes_block(phi) == post_bl) {
- set_irn_link(phi, get_irn_link(post_bl));
- set_irn_link(post_bl, phi);
- }
- /* Now the real results */
- if (n_res > 0) {
- for (j = 0; j < n_res; j++) {
- n_ret = 0;
- for (i = 0; i < arity; i++) {
- ret = get_irn_n(end_bl, i);
- if (is_Return(ret)) {
- cf_pred[n_ret] = get_Return_res(ret, j);
- n_ret++;
- }
- }
- if (n_ret > 0)
- phi = new_Phi(n_ret, cf_pred, get_irn_mode(cf_pred[0]));
- else
- phi = new_Bad();
- res_pred[j] = phi;
- /* Conserve Phi-list for further inlinings -- but might be optimized */
- if (get_nodes_block(phi) == post_bl) {
- set_Phi_next(phi, get_Block_phis(post_bl));
- set_Block_phis(post_bl, phi);
- }
- }
- set_Tuple_pred(call, pn_Call_T_result, new_Tuple(n_res, res_pred));
- } else {
- set_Tuple_pred(call, pn_Call_T_result, new_Bad());
- }
- /* handle the regular call */
- set_Tuple_pred(call, pn_Call_X_regular, new_Jmp());
-
- /* For now, we cannot inline calls with value_base */
- set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
-
- /* Finally the exception control flow.
- We have two (three) possible situations:
- First if the Call branches to an exception handler: We need to add a Phi node to
- collect the memory containing the exception objects. Further we need
- to add another block to get a correct representation of this Phi. To
- this block we add a Jmp that resolves into the X output of the Call
- when the Call is turned into a tuple.
- Second the Call branches to End, the exception is not handled. Just
- add all inlined exception branches to the End node.
- Third: there is no Exception edge at all. Handle as case two. */
- if (exc_handling == exc_handler) {
- n_exc = 0;
- for (i = 0; i < arity; i++) {
- ir_node *ret, *irn;
- ret = get_irn_n(end_bl, i);
- irn = skip_Proj(ret);
- if (is_fragile_op(irn) || is_Raise(irn)) {
- cf_pred[n_exc] = ret;
- ++n_exc;
- }
- }
- if (n_exc > 0) {
- new_Block(n_exc, cf_pred); /* watch it: current_block is changed! */
- set_Tuple_pred(call, pn_Call_X_except, new_Jmp());
- /* The Phi for the memories with the exception objects */
- n_exc = 0;
- for (i = 0; i < arity; i++) {
- ir_node *ret;
- ret = skip_Proj(get_irn_n(end_bl, i));
- if (is_Call(ret)) {
- cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 3);
- n_exc++;
- } else if (is_fragile_op(ret)) {
- /* We rely that all cfops have the memory output at the same position. */
- cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 0);
- n_exc++;
- } else if (is_Raise(ret)) {
- cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 1);
- n_exc++;
- }
- }
- set_Tuple_pred(call, pn_Call_M_except, new_Phi(n_exc, cf_pred, mode_M));
- } else {
- set_Tuple_pred(call, pn_Call_X_except, new_Bad());
- set_Tuple_pred(call, pn_Call_M_except, new_Bad());
- }
- } else {
- ir_node *main_end_bl;
- int main_end_bl_arity;
- ir_node **end_preds;
-
- /* assert(exc_handling == 1 || no exceptions. ) */
- n_exc = 0;
- for (i = 0; i < arity; i++) {
- ir_node *ret = get_irn_n(end_bl, i);
- ir_node *irn = skip_Proj(ret);
-
- if (is_fragile_op(irn) || is_Raise(irn)) {
- cf_pred[n_exc] = ret;
- n_exc++;
- }
- }
- main_end_bl = get_irg_end_block(current_ir_graph);
- main_end_bl_arity = get_irn_arity(main_end_bl);
- end_preds = xmalloc((n_exc + main_end_bl_arity) * sizeof(*end_preds));
-
- for (i = 0; i < main_end_bl_arity; ++i)
- end_preds[i] = get_irn_n(main_end_bl, i);
- for (i = 0; i < n_exc; ++i)
- end_preds[main_end_bl_arity + i] = cf_pred[i];
- set_irn_in(main_end_bl, n_exc + main_end_bl_arity, end_preds);
- set_Tuple_pred(call, pn_Call_X_except, new_Bad());
- set_Tuple_pred(call, pn_Call_M_except, new_Bad());
- free(end_preds);
- }
- free(res_pred);
- free(cf_pred);
-
- /* -- Turn CSE back on. -- */
- set_optimize(rem_opt);
-
- return 1;
-}
-
-/********************************************************************/
-/* Apply inlineing to small methods. */
-/********************************************************************/
-
-/** Represents a possible inlinable call in a graph. */
-typedef struct _call_entry call_entry;
-struct _call_entry {
- ir_node *call; /**< the Call */
- ir_graph *callee; /**< the callee called here */
- call_entry *next; /**< for linking the next one */
- unsigned weight; /**< the weight of the call */
-};
-
-/**
- * environment for inlining small irgs
- */
-typedef struct _inline_env_t {
- struct obstack obst; /**< an obstack where call_entries are allocated on. */
- call_entry *head; /**< the head of the call entry list */
- call_entry *tail; /**< the tail of the call entry list */
-} inline_env_t;
-
-/**
- * Returns the irg called from a Call node. If the irg is not
- * known, NULL is returned.
- *
- * @param call the call node
- */
-static ir_graph *get_call_called_irg(ir_node *call) {
- ir_node *addr;
-
- addr = get_Call_ptr(call);
- if (is_Global(addr)) {
- ir_entity *ent = get_Global_entity(addr);
- return get_entity_irg(ent);
- }
-
- return NULL;
-}
-
-/**
- * Walker: Collect all calls to known graphs inside a graph.
- */
-static void collect_calls(ir_node *call, void *env) {
- if (is_Call(call)) {
- ir_graph *called_irg = get_call_called_irg(call);
-
- if (called_irg != NULL) {
- /* The Call node calls a locally defined method. Remember to inline. */
- inline_env_t *ienv = env;
- call_entry *entry = obstack_alloc(&ienv->obst, sizeof(*entry));
- entry->call = call;
- entry->callee = called_irg;
- entry->next = NULL;
- entry->weight = 0;
-
- if (ienv->tail == NULL)
- ienv->head = entry;
- else
- ienv->tail->next = entry;
- ienv->tail = entry;
- }
- }
-}
-
-/**
- * Inlines all small methods at call sites where the called address comes
- * from a Const node that references the entity representing the called
- * method.
- * The size argument is a rough measure for the code size of the method:
- * Methods where the obstack containing the firm graph is smaller than
- * size are inlined.
- */
-void inline_small_irgs(ir_graph *irg, int size) {
- ir_graph *rem = current_ir_graph;
- inline_env_t env;
- call_entry *entry;
- DEBUG_ONLY(firm_dbg_module_t *dbg;)
-
- FIRM_DBG_REGISTER(dbg, "firm.opt.inline");
-
- current_ir_graph = irg;
- /* Handle graph state */
- assert(get_irg_phase_state(irg) != phase_building);
- free_callee_info(irg);
-
- /* Find Call nodes to inline.
- (We can not inline during a walk of the graph, as inlineing the same
- method several times changes the visited flag of the walked graph:
- after the first inlineing visited of the callee equals visited of
- the caller. With the next inlineing both are increased.) */
- obstack_init(&env.obst);
- env.head = env.tail = NULL;
- irg_walk_graph(irg, NULL, collect_calls, &env);
-
- if (env.head != NULL) {
- /* There are calls to inline */
- collect_phiprojs(irg);
- for (entry = env.head; entry != NULL; entry = entry->next) {
- ir_graph *callee = entry->callee;
- if (((_obstack_memory_used(callee->obst) - (int)obstack_room(callee->obst)) < size) ||
- (get_irg_inline_property(callee) >= irg_inline_forced)) {
- inline_method(entry->call, callee);
- }
- }
- }
- obstack_free(&env.obst, NULL);
- current_ir_graph = rem;
-}
-
-/**
- * Environment for inlining irgs.
- */
-typedef struct {
- int n_nodes; /**< Number of nodes in graph except Id, Tuple, Proj, Start, End. */
- int n_nodes_orig; /**< for statistics */
- call_entry *call_head; /**< The head of the list of all call nodes in this graph. */
- call_entry *call_tail; /**< The tail of the list of all call nodes in this graph .*/
- int n_call_nodes; /**< Number of Call nodes in the graph. */
- int n_call_nodes_orig; /**< for statistics */
- int n_callers; /**< Number of known graphs that call this graphs. */
- int n_callers_orig; /**< for statistics */
- int got_inline; /**< Set, if at leat one call inside this graph was inlined. */
-} inline_irg_env;
-
-/**
- * Allocate a new environment for inlining.
- */
-static inline_irg_env *alloc_inline_irg_env(struct obstack *obst) {
- inline_irg_env *env = obstack_alloc(obst, sizeof(*env));
- env->n_nodes = -2; /* do not count count Start, End */
- env->n_nodes_orig = -2; /* do not count Start, End */
- env->call_head = NULL;
- env->call_tail = NULL;
- env->n_call_nodes = 0;
- env->n_call_nodes_orig = 0;
- env->n_callers = 0;
- env->n_callers_orig = 0;
- env->got_inline = 0;
- return env;
-}
-
-typedef struct walker_env {
- struct obstack *obst; /**< the obstack for allocations. */
- inline_irg_env *x; /**< the inline environment */
- char ignore_runtime; /**< the ignore runtime flag */
- char ignore_callers; /**< if set, do change callers data */
-} wenv_t;
-
-/**
- * post-walker: collect all calls in the inline-environment
- * of a graph and sum some statistics.
- */
-static void collect_calls2(ir_node *call, void *ctx) {
- wenv_t *env = ctx;
- inline_irg_env *x = env->x;
- ir_opcode code = get_irn_opcode(call);
- ir_graph *callee;
- call_entry *entry;
-
- /* count meaningful nodes in irg */
- if (code != iro_Proj && code != iro_Tuple && code != iro_Sync) {
- ++x->n_nodes;
- ++x->n_nodes_orig;
- }
-
- if (code != iro_Call) return;
-
- /* check, if it's a runtime call */
- if (env->ignore_runtime) {
- ir_node *symc = get_Call_ptr(call);
-
- if (is_Global(symc)) {
- ir_entity *ent = get_Global_entity(symc);
-
- if (get_entity_additional_properties(ent) & mtp_property_runtime)
- return;
- }
- }
-
- /* collect all call nodes */
- ++x->n_call_nodes;
- ++x->n_call_nodes_orig;
-
- callee = get_call_called_irg(call);
- if (callee != NULL) {
- if (! env->ignore_callers) {
- inline_irg_env *callee_env = get_irg_link(callee);
- /* count all static callers */
- ++callee_env->n_callers;
- ++callee_env->n_callers_orig;
- }
-
- /* link it in the list of possible inlinable entries */
- entry = obstack_alloc(env->obst, sizeof(*entry));
- entry->call = call;
- entry->callee = callee;
- entry->next = NULL;
- if (x->call_tail == NULL)
- x->call_head = entry;
- else
- x->call_tail->next = entry;
- x->call_tail = entry;
- }
-}
-
-/**
- * Returns TRUE if the number of callers is 0 in the irg's environment,
- * hence this irg is a leave.
- */
-INLINE static int is_leave(ir_graph *irg) {
- inline_irg_env *env = get_irg_link(irg);
- return env->n_call_nodes == 0;
-}
-
-/**
- * Returns TRUE if the number of nodes in the callee is
- * smaller then size in the irg's environment.
- */
-INLINE static int is_smaller(ir_graph *callee, int size) {
- inline_irg_env *env = get_irg_link(callee);
- return env->n_nodes < size;
-}
-
-/**
- * Append the nodes of the list src to the nodes of the list in environment dst.
- */
-static void append_call_list(struct obstack *obst, inline_irg_env *dst, call_entry *src) {
- call_entry *entry, *nentry;
-
- /* Note that the src list points to Call nodes in the inlined graph, but
- we need Call nodes in our graph. Luckily the inliner leaves this information
- in the link field. */
- for (entry = src; entry != NULL; entry = entry->next) {
- nentry = obstack_alloc(obst, sizeof(*nentry));
- nentry->call = get_irn_link(entry->call);
- nentry->callee = entry->callee;
- nentry->next = NULL;
- dst->call_tail->next = nentry;
- dst->call_tail = nentry;
- }
-}
-
-/*
- * Inlines small leave methods at call sites where the called address comes
- * from a Const node that references the entity representing the called
- * method.
- * The size argument is a rough measure for the code size of the method:
- * Methods where the obstack containing the firm graph is smaller than
- * size are inlined.
- */
-void inline_leave_functions(int maxsize, int leavesize, int size, int ignore_runtime) {
- inline_irg_env *env;
- ir_graph *irg;
- int i, n_irgs;
- ir_graph *rem;
- int did_inline;
- wenv_t wenv;
- call_entry *entry, *tail;
- const call_entry *centry;
- struct obstack obst;
- pmap *copied_graphs;
- pmap_entry *pm_entry;
- DEBUG_ONLY(firm_dbg_module_t *dbg;)
-
- FIRM_DBG_REGISTER(dbg, "firm.opt.inline");
- rem = current_ir_graph;
- obstack_init(&obst);
-
- /* a map for the copied graphs, used to inline recursive calls */
- copied_graphs = pmap_create();
-
- /* extend all irgs by a temporary data structure for inlining. */
- n_irgs = get_irp_n_irgs();
- for (i = 0; i < n_irgs; ++i)
- set_irg_link(get_irp_irg(i), alloc_inline_irg_env(&obst));
-
- /* Precompute information in temporary data structure. */
- wenv.obst = &obst;
- wenv.ignore_runtime = ignore_runtime;
- wenv.ignore_callers = 0;
- for (i = 0; i < n_irgs; ++i) {
- ir_graph *irg = get_irp_irg(i);
-
- assert(get_irg_phase_state(irg) != phase_building);
- free_callee_info(irg);
-
- wenv.x = get_irg_link(irg);
- irg_walk_graph(irg, NULL, collect_calls2, &wenv);
- }
-
- /* -- and now inline. -- */
-
- /* Inline leaves recursively -- we might construct new leaves. */
- do {
- did_inline = 0;
-
- for (i = 0; i < n_irgs; ++i) {
- ir_node *call;
- int phiproj_computed = 0;
-
- current_ir_graph = get_irp_irg(i);
- env = (inline_irg_env *)get_irg_link(current_ir_graph);
-
- tail = NULL;
- for (entry = env->call_head; entry != NULL; entry = entry->next) {
- ir_graph *callee;
-
- if (env->n_nodes > maxsize) break;
-
- call = entry->call;
- callee = entry->callee;
-
- if (is_leave(callee) && (
- is_smaller(callee, leavesize) || (get_irg_inline_property(callee) >= irg_inline_forced))) {
- if (!phiproj_computed) {
- phiproj_computed = 1;
- collect_phiprojs(current_ir_graph);
- }
- did_inline = inline_method(call, callee);
-
- if (did_inline) {
- inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
-
- /* was inlined, must be recomputed */
- phiproj_computed = 0;
-
- /* Do some statistics */
- env->got_inline = 1;
- --env->n_call_nodes;
- env->n_nodes += callee_env->n_nodes;
- --callee_env->n_callers;
-
- /* remove this call from the list */
- if (tail != NULL)
- tail->next = entry->next;
- else
- env->call_head = entry->next;
- continue;
- }
- }
- tail = entry;
- }
- env->call_tail = tail;
- }
- } while (did_inline);
-
- /* inline other small functions. */
- for (i = 0; i < n_irgs; ++i) {
- ir_node *call;
- int phiproj_computed = 0;
-
- current_ir_graph = get_irp_irg(i);
- env = (inline_irg_env *)get_irg_link(current_ir_graph);
-
- /* note that the list of possible calls is updated during the process */
- tail = NULL;
- for (entry = env->call_head; entry != NULL; entry = entry->next) {
- ir_graph *callee;
- pmap_entry *e;
-
- call = entry->call;
- callee = entry->callee;
-
- e = pmap_find(copied_graphs, callee);
- if (e != NULL) {
- /*
- * Remap callee if we have a copy.
- * FIXME: Should we do this only for recursive Calls ?
- */
- callee = e->value;
- }
-
- if (((is_smaller(callee, size) && (env->n_nodes < maxsize)) || /* small function */
- (get_irg_inline_property(callee) >= irg_inline_forced))) {
- if (current_ir_graph == callee) {
- /*
- * Recursive call: we cannot directly inline because we cannot walk
- * the graph and change it. So we have to make a copy of the graph
- * first.
- */
-
- inline_irg_env *callee_env;
- ir_graph *copy;
-
- /*
- * No copy yet, create one.
- * Note that recursive methods are never leaves, so it is sufficient
- * to test this condition here.
- */
- copy = create_irg_copy(callee);
-
- /* create_irg_copy() destroys the Proj links, recompute them */
- phiproj_computed = 0;
-
- /* allocate new environment */
- callee_env = alloc_inline_irg_env(&obst);
- set_irg_link(copy, callee_env);
-
- wenv.x = callee_env;
- wenv.ignore_callers = 1;
- irg_walk_graph(copy, NULL, collect_calls2, &wenv);
-
- /*
- * Enter the entity of the original graph. This is needed
- * for inline_method(). However, note that ent->irg still points
- * to callee, NOT to copy.
- */
- set_irg_entity(copy, get_irg_entity(callee));
-
- pmap_insert(copied_graphs, callee, copy);
- callee = copy;
-
- /* we have only one caller: the original graph */
- callee_env->n_callers = 1;
- callee_env->n_callers_orig = 1;
- }
- if (! phiproj_computed) {
- phiproj_computed = 1;
- collect_phiprojs(current_ir_graph);
- }
- did_inline = inline_method(call, callee);
- if (did_inline) {
- inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
-
- /* was inlined, must be recomputed */
- phiproj_computed = 0;
-
- /* callee was inline. Append it's call list. */
- env->got_inline = 1;
- --env->n_call_nodes;
- append_call_list(&obst, env, callee_env->call_head);
- env->n_call_nodes += callee_env->n_call_nodes;
- env->n_nodes += callee_env->n_nodes;
- --callee_env->n_callers;
-
- /* after we have inlined callee, all called methods inside callee
- are now called once more */
- for (centry = callee_env->call_head; centry != NULL; centry = centry->next) {
- inline_irg_env *penv = get_irg_link(centry->callee);
- ++penv->n_callers;
- }
-
- /* remove this call from the list */
- if (tail != NULL)
- tail->next = entry->next;
- else
- env->call_head = entry->next;
- continue;
- }
- }
- tail = entry;
- }
- env->call_tail = tail;
- }
-
- for (i = 0; i < n_irgs; ++i) {
- irg = get_irp_irg(i);
- env = (inline_irg_env *)get_irg_link(irg);
-
- if (env->got_inline) {
- /* this irg got calls inlined */
- set_irg_outs_inconsistent(irg);
- set_irg_doms_inconsistent(irg);
-
- optimize_graph_df(irg);
- optimize_cf(irg);
- }
- if (env->got_inline || (env->n_callers_orig != env->n_callers)) {
- DB((dbg, SET_LEVEL_1, "Nodes:%3d ->%3d, calls:%3d ->%3d, callers:%3d ->%3d, -- %s\n",
- env->n_nodes_orig, env->n_nodes, env->n_call_nodes_orig, env->n_call_nodes,
- env->n_callers_orig, env->n_callers,
- get_entity_name(get_irg_entity(irg))));
- }
- }
-
- /* kill the copied graphs: we don't need them anymore */
- foreach_pmap(copied_graphs, pm_entry) {
- ir_graph *copy = pm_entry->value;
-
- /* reset the entity, otherwise it will be deleted in the next step ... */
- set_irg_entity(copy, NULL);
- free_ir_graph(copy);
- }
- pmap_destroy(copied_graphs);
-
- obstack_free(&obst, NULL);
- current_ir_graph = rem;
-}
--- /dev/null
+/*
+ * 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.
+ */
+
+/**
+ * @file
+ * @brief Dead node elimination and Procedure Inlining.
+ * @author Michael Beck, Goetz Lindenmaier
+ * @version $Id$
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include "irnode_t.h"
+#include "irgraph_t.h"
+#include "irprog_t.h"
+
+#include "iroptimize.h"
+#include "ircons_t.h"
+#include "iropt_t.h"
+#include "irgopt.h"
+#include "irgmod.h"
+#include "irgwalk.h"
+
+#include "adt/array.h"
+#include "adt/pset.h"
+#include "adt/pmap.h"
+#include "adt/pdeq.h"
+#include "adt/xmalloc.h"
+
+#include "irouts.h"
+#include "irloop_t.h"
+#include "irbackedge_t.h"
+#include "cgana.h"
+#include "trouts.h"
+#include "error.h"
+
+#include "iredges_t.h"
+#include "irflag_t.h"
+#include "irhooks.h"
+#include "irtools.h"
+
+
+/*------------------------------------------------------------------*/
+/* Routines for dead node elimination / copying garbage collection */
+/* of the obstack. */
+/*------------------------------------------------------------------*/
+
+/**
+ * Remember the new node in the old node by using a field all nodes have.
+ */
+#define set_new_node(oldn, newn) set_irn_link(oldn, newn)
+
+/**
+ * Get this new node, before the old node is forgotten.
+ */
+#define get_new_node(oldn) get_irn_link(oldn)
+
+/**
+ * Check if a new node was set.
+ */
+#define has_new_node(n) (get_new_node(n) != NULL)
+
+/**
+ * We use the block_visited flag to mark that we have computed the
+ * number of useful predecessors for this block.
+ * Further we encode the new arity in this flag in the old blocks.
+ * Remembering the arity is useful, as it saves a lot of pointer
+ * accesses. This function is called for all Phi and Block nodes
+ * in a Block.
+ */
+static INLINE int
+compute_new_arity(ir_node *b) {
+ int i, res, irn_arity;
+ int irg_v, block_v;
+
+ irg_v = get_irg_block_visited(current_ir_graph);
+ block_v = get_Block_block_visited(b);
+ if (block_v >= irg_v) {
+ /* we computed the number of preds for this block and saved it in the
+ block_v flag */
+ return block_v - irg_v;
+ } else {
+ /* compute the number of good predecessors */
+ res = irn_arity = get_irn_arity(b);
+ for (i = 0; i < irn_arity; i++)
+ if (is_Bad(get_irn_n(b, i))) res--;
+ /* save it in the flag. */
+ set_Block_block_visited(b, irg_v + res);
+ return res;
+ }
+}
+
+/**
+ * Copies the node to the new obstack. The Ins of the new node point to
+ * the predecessors on the old obstack. For block/phi nodes not all
+ * predecessors might be copied. n->link points to the new node.
+ * For Phi and Block nodes the function allocates in-arrays with an arity
+ * only for useful predecessors. The arity is determined by counting
+ * the non-bad predecessors of the block.
+ *
+ * @param n The node to be copied
+ * @param env if non-NULL, the node number attribute will be copied to the new node
+ *
+ * Note: Also used for loop unrolling.
+ */
+static void copy_node(ir_node *n, void *env) {
+ ir_node *nn, *block;
+ int new_arity;
+ ir_op *op = get_irn_op(n);
+ (void) env;
+
+ if (op == op_Bad) {
+ /* node copied already */
+ return;
+ } else if (op == op_Block) {
+ block = NULL;
+ new_arity = compute_new_arity(n);
+ n->attr.block.graph_arr = NULL;
+ } else {
+ block = get_nodes_block(n);
+ if (op == op_Phi) {
+ new_arity = compute_new_arity(block);
+ } else {
+ new_arity = get_irn_arity(n);
+ }
+ }
+ nn = new_ir_node(get_irn_dbg_info(n),
+ current_ir_graph,
+ block,
+ op,
+ get_irn_mode(n),
+ new_arity,
+ get_irn_in(n) + 1);
+ /* Copy the attributes. These might point to additional data. If this
+ was allocated on the old obstack the pointers now are dangling. This
+ frees e.g. the memory of the graph_arr allocated in new_immBlock. */
+ if (op == op_Block) {
+ /* we cannot allow blocks WITHOUT macroblock input */
+ set_Block_MacroBlock(nn, get_Block_MacroBlock(n));
+ }
+ copy_node_attr(n, nn);
+
+#ifdef DEBUG_libfirm
+ {
+ int copy_node_nr = env != NULL;
+ if (copy_node_nr) {
+ /* for easier debugging, we want to copy the node numbers too */
+ nn->node_nr = n->node_nr;
+ }
+ }
+#endif
+
+ set_new_node(n, nn);
+ hook_dead_node_elim_subst(current_ir_graph, n, nn);
+}
+
+/**
+ * Copies new predecessors of old node to new node remembered in link.
+ * Spare the Bad predecessors of Phi and Block nodes.
+ */
+static void copy_preds(ir_node *n, void *env) {
+ ir_node *nn, *block;
+ int i, j, irn_arity;
+ (void) env;
+
+ nn = get_new_node(n);
+
+ if (is_Block(n)) {
+ /* copy the macro block header */
+ ir_node *mbh = get_Block_MacroBlock(n);
+
+ if (mbh == n) {
+ /* this block is a macroblock header */
+ set_Block_MacroBlock(nn, nn);
+ } else {
+ /* get the macro block header */
+ ir_node *nmbh = get_new_node(mbh);
+ assert(nmbh != NULL);
+ set_Block_MacroBlock(nn, nmbh);
+ }
+
+ /* Don't copy Bad nodes. */
+ j = 0;
+ irn_arity = get_irn_arity(n);
+ for (i = 0; i < irn_arity; i++) {
+ if (! is_Bad(get_irn_n(n, i))) {
+ ir_node *pred = get_irn_n(n, i);
+ set_irn_n(nn, j, get_new_node(pred));
+ j++;
+ }
+ }
+ /* repair the block visited flag from above misuse. Repair it in both
+ graphs so that the old one can still be used. */
+ set_Block_block_visited(nn, 0);
+ set_Block_block_visited(n, 0);
+ /* Local optimization could not merge two subsequent blocks if
+ in array contained Bads. Now it's possible.
+ We don't call optimize_in_place as it requires
+ that the fields in ir_graph are set properly. */
+ if ((get_opt_control_flow_straightening()) &&
+ (get_Block_n_cfgpreds(nn) == 1) &&
+ is_Jmp(get_Block_cfgpred(nn, 0))) {
+ ir_node *old = get_nodes_block(get_Block_cfgpred(nn, 0));
+ if (nn == old) {
+ /* Jmp jumps into the block it is in -- deal self cycle. */
+ assert(is_Bad(get_new_node(get_irg_bad(current_ir_graph))));
+ exchange(nn, get_new_node(get_irg_bad(current_ir_graph)));
+ } else {
+ exchange(nn, old);
+ }
+ }
+ } else if (is_Phi(n) && get_irn_arity(n) > 0) {
+ /* Don't copy node if corresponding predecessor in block is Bad.
+ The Block itself should not be Bad. */
+ block = get_nodes_block(n);
+ set_nodes_block(nn, get_new_node(block));
+ j = 0;
+ irn_arity = get_irn_arity(n);
+ for (i = 0; i < irn_arity; i++) {
+ if (! is_Bad(get_irn_n(block, i))) {
+ ir_node *pred = get_irn_n(n, i);
+ set_irn_n(nn, j, get_new_node(pred));
+ /*if (is_backedge(n, i)) set_backedge(nn, j);*/
+ j++;
+ }
+ }
+ /* If the pre walker reached this Phi after the post walker visited the
+ block block_visited is > 0. */
+ set_Block_block_visited(get_nodes_block(n), 0);
+ /* Compacting the Phi's ins might generate Phis with only one
+ predecessor. */
+ if (get_irn_arity(nn) == 1)
+ exchange(nn, get_irn_n(nn, 0));
+ } else {
+ irn_arity = get_irn_arity(n);
+ for (i = -1; i < irn_arity; i++)
+ set_irn_n(nn, i, get_new_node(get_irn_n(n, i)));
+ }
+ /* Now the new node is complete. We can add it to the hash table for CSE.
+ @@@ inlining aborts if we identify End. Why? */
+ if (!is_End(nn))
+ add_identities(current_ir_graph->value_table, nn);
+}
+
+/**
+ * Copies the graph recursively, compacts the keep-alives of the end node.
+ *
+ * @param irg the graph to be copied
+ * @param copy_node_nr If non-zero, the node number will be copied
+ */
+static void copy_graph(ir_graph *irg, int copy_node_nr) {
+ ir_node *oe, *ne, *ob, *nb, *om, *nm; /* old end, new end, old bad, new bad, old NoMem, new NoMem */
+ ir_node *ka; /* keep alive */
+ int i, irn_arity;
+ unsigned long vfl;
+
+ /* Some nodes must be copied by hand, sigh */
+ vfl = get_irg_visited(irg);
+ set_irg_visited(irg, vfl + 1);
+
+ oe = get_irg_end(irg);
+ mark_irn_visited(oe);
+ /* copy the end node by hand, allocate dynamic in array! */
+ ne = new_ir_node(get_irn_dbg_info(oe),
+ irg,
+ NULL,
+ op_End,
+ mode_X,
+ -1,
+ NULL);
+ /* Copy the attributes. Well, there might be some in the future... */
+ copy_node_attr(oe, ne);
+ set_new_node(oe, ne);
+
+ /* copy the Bad node */
+ ob = get_irg_bad(irg);
+ mark_irn_visited(ob);
+ nb = new_ir_node(get_irn_dbg_info(ob),
+ irg,
+ NULL,
+ op_Bad,
+ mode_T,
+ 0,
+ NULL);
+ copy_node_attr(ob, nb);
+ set_new_node(ob, nb);
+
+ /* copy the NoMem node */
+ om = get_irg_no_mem(irg);
+ mark_irn_visited(om);
+ nm = new_ir_node(get_irn_dbg_info(om),
+ irg,
+ NULL,
+ op_NoMem,
+ mode_M,
+ 0,
+ NULL);
+ copy_node_attr(om, nm);
+ set_new_node(om, nm);
+
+ /* copy the live nodes */
+ set_irg_visited(irg, vfl);
+ irg_walk(get_nodes_block(oe), copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+
+ /* Note: from yet, the visited flag of the graph is equal to vfl + 1 */
+
+ /* visit the anchors as well */
+ for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
+ ir_node *n = get_irg_anchor(irg, i);
+
+ if (n && (get_irn_visited(n) <= vfl)) {
+ set_irg_visited(irg, vfl);
+ irg_walk(n, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+ }
+ }
+
+ /* copy_preds for the end node ... */
+ set_nodes_block(ne, get_new_node(get_nodes_block(oe)));
+
+ /*- ... and now the keep alives. -*/
+ /* First pick the not marked block nodes and walk them. We must pick these
+ first as else we will oversee blocks reachable from Phis. */
+ irn_arity = get_End_n_keepalives(oe);
+ for (i = 0; i < irn_arity; i++) {
+ ka = get_End_keepalive(oe, i);
+ if (is_Block(ka)) {
+ if (get_irn_visited(ka) <= vfl) {
+ /* We must keep the block alive and copy everything reachable */
+ set_irg_visited(irg, vfl);
+ irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+ }
+ add_End_keepalive(ne, get_new_node(ka));
+ }
+ }
+
+ /* Now pick other nodes. Here we will keep all! */
+ irn_arity = get_End_n_keepalives(oe);
+ for (i = 0; i < irn_arity; i++) {
+ ka = get_End_keepalive(oe, i);
+ if (!is_Block(ka)) {
+ if (get_irn_visited(ka) <= vfl) {
+ /* We didn't copy the node yet. */
+ set_irg_visited(irg, vfl);
+ irg_walk(ka, copy_node, copy_preds, INT_TO_PTR(copy_node_nr));
+ }
+ add_End_keepalive(ne, get_new_node(ka));
+ }
+ }
+
+ /* start block sometimes only reached after keep alives */
+ set_nodes_block(nb, get_new_node(get_nodes_block(ob)));
+ set_nodes_block(nm, get_new_node(get_nodes_block(om)));
+}
+
+/**
+ * Copies the graph reachable from current_ir_graph->end to the obstack
+ * in current_ir_graph and fixes the environment.
+ * Then fixes the fields in current_ir_graph containing nodes of the
+ * graph.
+ *
+ * @param copy_node_nr If non-zero, the node number will be copied
+ */
+static void
+copy_graph_env(int copy_node_nr) {
+ ir_graph *irg = current_ir_graph;
+ ir_node *old_end, *new_anchor;
+ int i;
+
+ /* remove end_except and end_reg nodes */
+ old_end = get_irg_end(irg);
+ set_irg_end_except (irg, old_end);
+ set_irg_end_reg (irg, old_end);
+
+ /* Not all nodes remembered in irg might be reachable
+ from the end node. Assure their link is set to NULL, so that
+ we can test whether new nodes have been computed. */
+ for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
+ ir_node *n = get_irg_anchor(irg, i);
+ if (n != NULL)
+ set_new_node(n, NULL);
+ }
+ /* we use the block walk flag for removing Bads from Blocks ins. */
+ inc_irg_block_visited(irg);
+
+ /* copy the graph */
+ copy_graph(irg, copy_node_nr);
+
+ /* fix the anchor */
+ old_end = get_irg_end(irg);
+ new_anchor = new_Anchor(irg);
+
+ for (i = get_irg_n_anchors(irg) - 1; i >= 0; --i) {
+ ir_node *n = get_irg_anchor(irg, i);
+ if (n)
+ set_irn_n(new_anchor, i, get_new_node(n));
+ }
+ free_End(old_end);
+ irg->anchor = new_anchor;
+
+ /* ensure the new anchor is placed in the endblock */
+ set_nodes_block(new_anchor, get_irg_end_block(irg));
+}
+
+/**
+ * Copies all reachable nodes to a new obstack. Removes bad inputs
+ * from block nodes and the corresponding inputs from Phi nodes.
+ * Merges single exit blocks with single entry blocks and removes
+ * 1-input Phis.
+ * Adds all new nodes to a new hash table for CSE. Does not
+ * perform CSE, so the hash table might contain common subexpressions.
+ */
+void dead_node_elimination(ir_graph *irg) {
+ ir_graph *rem;
+#ifdef INTERPROCEDURAL_VIEW
+ int rem_ipview = get_interprocedural_view();
+#endif
+ struct obstack *graveyard_obst = NULL;
+ struct obstack *rebirth_obst = NULL;
+ assert(! edges_activated(irg) && "dead node elimination requires disabled edges");
+
+ /* inform statistics that we started a dead-node elimination run */
+ hook_dead_node_elim(irg, 1);
+
+ /* Remember external state of current_ir_graph. */
+ rem = current_ir_graph;
+ current_ir_graph = irg;
+#ifdef INTERPROCEDURAL_VIEW
+ set_interprocedural_view(0);
+#endif
+
+ assert(get_irg_phase_state(irg) != phase_building);
+
+ /* Handle graph state */
+ free_callee_info(irg);
+ free_irg_outs(irg);
+ free_trouts();
+
+ /* @@@ so far we loose loops when copying */
+ free_loop_information(irg);
+
+ set_irg_doms_inconsistent(irg);
+
+ /* A quiet place, where the old obstack can rest in peace,
+ until it will be cremated. */
+ graveyard_obst = irg->obst;
+
+ /* A new obstack, where the reachable nodes will be copied to. */
+ rebirth_obst = xmalloc(sizeof(*rebirth_obst));
+ irg->obst = rebirth_obst;
+ obstack_init(irg->obst);
+ irg->last_node_idx = 0;
+
+ /* We also need a new value table for CSE */
+ del_identities(irg->value_table);
+ irg->value_table = new_identities();
+
+ /* Copy the graph from the old to the new obstack */
+ copy_graph_env(/*copy_node_nr=*/1);
+
+ /* Free memory from old unoptimized obstack */
+ obstack_free(graveyard_obst, 0); /* First empty the obstack ... */
+ xfree(graveyard_obst); /* ... then free it. */
+
+ /* inform statistics that the run is over */
+ hook_dead_node_elim(irg, 0);
+
+ current_ir_graph = rem;
+#ifdef INTERPROCEDURAL_VIEW
+ set_interprocedural_view(rem_ipview);
+#endif
+}
+
+/**
+ * Relink bad predecessors of a block and store the old in array to the
+ * link field. This function is called by relink_bad_predecessors().
+ * The array of link field starts with the block operand at position 0.
+ * If block has bad predecessors, create a new in array without bad preds.
+ * Otherwise let in array untouched.
+ */
+static void relink_bad_block_predecessors(ir_node *n, void *env) {
+ ir_node **new_in, *irn;
+ int i, new_irn_n, old_irn_arity, new_irn_arity = 0;
+ (void) env;
+
+ /* if link field of block is NULL, look for bad predecessors otherwise
+ this is already done */
+ if (is_Block(n) && get_irn_link(n) == NULL) {
+ /* save old predecessors in link field (position 0 is the block operand)*/
+ set_irn_link(n, get_irn_in(n));
+
+ /* count predecessors without bad nodes */
+ old_irn_arity = get_irn_arity(n);
+ for (i = 0; i < old_irn_arity; i++)
+ if (!is_Bad(get_irn_n(n, i)))
+ ++new_irn_arity;
+
+ /* arity changing: set new predecessors without bad nodes */
+ if (new_irn_arity < old_irn_arity) {
+ /* Get new predecessor array. We do not resize the array, as we must
+ keep the old one to update Phis. */
+ new_in = NEW_ARR_D(ir_node *, current_ir_graph->obst, (new_irn_arity+1));
+
+ /* set new predecessors in array */
+ new_in[0] = NULL;
+ new_irn_n = 1;
+ for (i = 0; i < old_irn_arity; i++) {
+ irn = get_irn_n(n, i);
+ if (!is_Bad(irn)) {
+ new_in[new_irn_n] = irn;
+ is_backedge(n, i) ? set_backedge(n, new_irn_n-1) : set_not_backedge(n, new_irn_n-1);
+ ++new_irn_n;
+ }
+ }
+ /* ARR_SETLEN(int, n->attr.block.backedge, new_irn_arity); */
+ ARR_SHRINKLEN(n->attr.block.backedge, new_irn_arity);
+ n->in = new_in;
+ } /* ir node has bad predecessors */
+ } /* Block is not relinked */
+}
+
+/**
+ * Relinks Bad predecessors from Blocks and Phis called by walker
+ * remove_bad_predecesors(). If n is a Block, call
+ * relink_bad_block_redecessors(). If n is a Phi-node, call also the relinking
+ * function of Phi's Block. If this block has bad predecessors, relink preds
+ * of the Phi-node.
+ */
+static void relink_bad_predecessors(ir_node *n, void *env) {
+ ir_node *block, **old_in;
+ int i, old_irn_arity, new_irn_arity;
+
+ /* relink bad predecessors of a block */
+ if (is_Block(n))
+ relink_bad_block_predecessors(n, env);
+
+ /* If Phi node relink its block and its predecessors */
+ if (is_Phi(n)) {
+ /* Relink predecessors of phi's block */
+ block = get_nodes_block(n);
+ if (get_irn_link(block) == NULL)
+ relink_bad_block_predecessors(block, env);
+
+ old_in = (ir_node **)get_irn_link(block); /* Of Phi's Block */
+ old_irn_arity = ARR_LEN(old_in);
+
+ /* Relink Phi predecessors if count of predecessors changed */
+ if (old_irn_arity != ARR_LEN(get_irn_in(block))) {
+ /* set new predecessors in array
+ n->in[0] remains the same block */
+ new_irn_arity = 1;
+ for(i = 1; i < old_irn_arity; i++)
+ if (!is_Bad(old_in[i])) {
+ n->in[new_irn_arity] = n->in[i];
+ is_backedge(n, i) ? set_backedge(n, new_irn_arity) : set_not_backedge(n, new_irn_arity);
+ ++new_irn_arity;
+ }
+
+ ARR_SETLEN(ir_node *, n->in, new_irn_arity);
+ ARR_SETLEN(int, n->attr.phi.u.backedge, new_irn_arity);
+ }
+ } /* n is a Phi node */
+}
+
+/*
+ * Removes Bad Bad predecessors from Blocks and the corresponding
+ * inputs to Phi nodes as in dead_node_elimination but without
+ * copying the graph.
+ * On walking up set the link field to NULL, on walking down call
+ * relink_bad_predecessors() (This function stores the old in array
+ * to the link field and sets a new in array if arity of predecessors
+ * changes).
+ */
+void remove_bad_predecessors(ir_graph *irg) {
+ panic("Fix backedge handling first");
+ irg_walk_graph(irg, firm_clear_link, relink_bad_predecessors, NULL);
+}
+
+
+/*
+ __ _ __ __
+ (_ __ o _ | \/ |_
+ __)|_| | \_/ | \_/(/_ |_/\__|__
+
+ The following stuff implements a facility that automatically patches
+ registered ir_node pointers to the new node when a dead node elimination occurs.
+*/
+
+struct _survive_dce_t {
+ struct obstack obst;
+ pmap *places;
+ pmap *new_places;
+ hook_entry_t dead_node_elim;
+ hook_entry_t dead_node_elim_subst;
+};
+
+typedef struct _survive_dce_list_t {
+ struct _survive_dce_list_t *next;
+ ir_node **place;
+} survive_dce_list_t;
+
+static void dead_node_hook(void *context, ir_graph *irg, int start) {
+ survive_dce_t *sd = context;
+ (void) irg;
+
+ /* Create a new map before the dead node elimination is performed. */
+ if (start) {
+ sd->new_places = pmap_create_ex(pmap_count(sd->places));
+ } else {
+ /* Patch back all nodes if dead node elimination is over and something is to be done. */
+ pmap_destroy(sd->places);
+ sd->places = sd->new_places;
+ sd->new_places = NULL;
+ }
+}
+
+/**
+ * Hook called when dead node elimination replaces old by nw.
+ */
+static void dead_node_subst_hook(void *context, ir_graph *irg, ir_node *old, ir_node *nw) {
+ survive_dce_t *sd = context;
+ survive_dce_list_t *list = pmap_get(sd->places, old);
+ (void) irg;
+
+ /* If the node is to be patched back, write the new address to all registered locations. */
+ if (list) {
+ survive_dce_list_t *p;
+
+ for (p = list; p; p = p->next)
+ *(p->place) = nw;
+
+ pmap_insert(sd->new_places, nw, list);
+ }
+}
+
+/**
+ * Make a new Survive DCE environment.
+ */
+survive_dce_t *new_survive_dce(void) {
+ survive_dce_t *res = xmalloc(sizeof(res[0]));
+ obstack_init(&res->obst);
+ res->places = pmap_create();
+ res->new_places = NULL;
+
+ res->dead_node_elim.hook._hook_dead_node_elim = dead_node_hook;
+ res->dead_node_elim.context = res;
+ res->dead_node_elim.next = NULL;
+
+ res->dead_node_elim_subst.hook._hook_dead_node_elim_subst = dead_node_subst_hook;
+ res->dead_node_elim_subst.context = res;
+ res->dead_node_elim_subst.next = NULL;
+
+#ifndef FIRM_ENABLE_HOOKS
+ assert(0 && "need hooks enabled");
+#endif
+
+ register_hook(hook_dead_node_elim, &res->dead_node_elim);
+ register_hook(hook_dead_node_elim_subst, &res->dead_node_elim_subst);
+ return res;
+}
+
+/**
+ * Free a Survive DCE environment.
+ */
+void free_survive_dce(survive_dce_t *sd) {
+ obstack_free(&sd->obst, NULL);
+ pmap_destroy(sd->places);
+ unregister_hook(hook_dead_node_elim, &sd->dead_node_elim);
+ unregister_hook(hook_dead_node_elim_subst, &sd->dead_node_elim_subst);
+ xfree(sd);
+}
+
+/**
+ * Register a node pointer to be patched upon DCE.
+ * When DCE occurs, the node pointer specified by @p place will be
+ * patched to the new address of the node it is pointing to.
+ *
+ * @param sd The Survive DCE environment.
+ * @param place The address of the node pointer.
+ */
+void survive_dce_register_irn(survive_dce_t *sd, ir_node **place) {
+ if (*place != NULL) {
+ ir_node *irn = *place;
+ survive_dce_list_t *curr = pmap_get(sd->places, irn);
+ survive_dce_list_t *nw = obstack_alloc(&sd->obst, sizeof(nw[0]));
+
+ nw->next = curr;
+ nw->place = place;
+
+ pmap_insert(sd->places, irn, nw);
+ }
+}
+
+/*--------------------------------------------------------------------*/
+/* Functionality for inlining */
+/*--------------------------------------------------------------------*/
+
+/**
+ * Copy node for inlineing. Updates attributes that change when
+ * inlineing but not for dead node elimination.
+ *
+ * Copies the node by calling copy_node() and then updates the entity if
+ * it's a local one. env must be a pointer of the frame type of the
+ * inlined procedure. The new entities must be in the link field of
+ * the entities.
+ */
+static INLINE void
+copy_node_inline(ir_node *n, void *env) {
+ ir_node *nn;
+ ir_type *frame_tp = (ir_type *)env;
+
+ copy_node(n, NULL);
+ if (is_Sel(n)) {
+ nn = get_new_node (n);
+ assert(is_Sel(nn));
+ if (get_entity_owner(get_Sel_entity(n)) == frame_tp) {
+ set_Sel_entity(nn, get_entity_link(get_Sel_entity(n)));
+ }
+ } else if (is_Block(n)) {
+ nn = get_new_node (n);
+ nn->attr.block.irg = current_ir_graph;
+ }
+}
+
+/**
+ * Walker: checks if P_value_arg_base is used.
+ */
+static void find_addr(ir_node *node, void *env) {
+ int *allow_inline = env;
+ if (is_Proj(node) &&
+ is_Start(get_Proj_pred(node)) &&
+ get_Proj_proj(node) == pn_Start_P_value_arg_base) {
+ *allow_inline = 0;
+ }
+}
+
+/**
+ * Check if we can inline a given call.
+ * Currently, we cannot inline two cases:
+ * - call with compound arguments
+ * - graphs that take the address of a parameter
+ *
+ * check these conditions here
+ */
+static int can_inline(ir_node *call, ir_graph *called_graph) {
+ ir_type *call_type = get_Call_type(call);
+ int params, ress, i, res;
+ assert(is_Method_type(call_type));
+
+ params = get_method_n_params(call_type);
+ ress = get_method_n_ress(call_type);
+
+ /* check parameters for compound arguments */
+ for (i = 0; i < params; ++i) {
+ ir_type *p_type = get_method_param_type(call_type, i);
+
+ if (is_compound_type(p_type))
+ return 0;
+ }
+
+ /* check results for compound arguments */
+ for (i = 0; i < ress; ++i) {
+ ir_type *r_type = get_method_res_type(call_type, i);
+
+ if (is_compound_type(r_type))
+ return 0;
+ }
+
+ res = 1;
+ irg_walk_graph(called_graph, find_addr, NULL, &res);
+
+ return res;
+}
+
+enum exc_mode {
+ exc_handler = 0, /**< There is a handler. */
+ exc_to_end = 1, /**< Branches to End. */
+ exc_no_handler = 2 /**< Exception handling not represented. */
+};
+
+/* Inlines a method at the given call site. */
+int inline_method(ir_node *call, ir_graph *called_graph) {
+ ir_node *pre_call;
+ ir_node *post_call, *post_bl;
+ ir_node *in[pn_Start_max];
+ ir_node *end, *end_bl;
+ ir_node **res_pred;
+ ir_node **cf_pred;
+ ir_node *ret, *phi;
+ int arity, n_ret, n_exc, n_res, i, n, j, rem_opt, irn_arity;
+ enum exc_mode exc_handling;
+ ir_type *called_frame, *curr_frame;
+ irg_inline_property prop = get_irg_inline_property(called_graph);
+ ir_entity *ent;
+
+ if (prop == irg_inline_forbidden)
+ return 0;
+
+ ent = get_irg_entity(called_graph);
+
+ /* Do not inline variadic functions. */
+ if (get_method_variadicity(get_entity_type(ent)) == variadicity_variadic)
+ return 0;
+
+ assert(get_method_n_params(get_entity_type(ent)) ==
+ get_method_n_params(get_Call_type(call)));
+
+ /*
+ * We cannot inline a recursive call. The graph must be copied before
+ * the call the inline_method() using create_irg_copy().
+ */
+ if (called_graph == current_ir_graph)
+ return 0;
+
+ /*
+ * currently, we cannot inline two cases:
+ * - call with compound arguments
+ * - graphs that take the address of a parameter
+ */
+ if (! can_inline(call, called_graph))
+ return 0;
+
+ /* -- Turn off optimizations, this can cause problems when allocating new nodes. -- */
+ rem_opt = get_opt_optimize();
+ set_optimize(0);
+
+ /* Handle graph state */
+ assert(get_irg_phase_state(current_ir_graph) != phase_building);
+ assert(get_irg_pinned(current_ir_graph) == op_pin_state_pinned);
+ assert(get_irg_pinned(called_graph) == op_pin_state_pinned);
+ set_irg_outs_inconsistent(current_ir_graph);
+ set_irg_extblk_inconsistent(current_ir_graph);
+ set_irg_doms_inconsistent(current_ir_graph);
+ set_irg_loopinfo_inconsistent(current_ir_graph);
+ set_irg_callee_info_state(current_ir_graph, irg_callee_info_inconsistent);
+
+ /* -- Check preconditions -- */
+ assert(is_Call(call));
+
+ /* here we know we WILL inline, so inform the statistics */
+ hook_inline(call, called_graph);
+
+ /* -- Decide how to handle exception control flow: Is there a handler
+ for the Call node, or do we branch directly to End on an exception?
+ exc_handling:
+ 0 There is a handler.
+ 1 Branches to End.
+ 2 Exception handling not represented in Firm. -- */
+ {
+ ir_node *proj, *Mproj = NULL, *Xproj = NULL;
+ for (proj = get_irn_link(call); proj; proj = get_irn_link(proj)) {
+ long proj_nr = get_Proj_proj(proj);
+ if (proj_nr == pn_Call_X_except) Xproj = proj;
+ if (proj_nr == pn_Call_M_except) Mproj = proj;
+ }
+ if (Mproj) { assert(Xproj); exc_handling = exc_handler; } /* Mproj */
+ else if (Xproj) { exc_handling = exc_to_end; } /* !Mproj && Xproj */
+ else { exc_handling = exc_no_handler; } /* !Mproj && !Xproj */
+ }
+
+ /* --
+ the procedure and later replaces the Start node of the called graph.
+ Post_call is the old Call node and collects the results of the called
+ graph. Both will end up being a tuple. -- */
+ post_bl = get_nodes_block(call);
+ set_irg_current_block(current_ir_graph, post_bl);
+ /* XxMxPxPxPxT of Start + parameter of Call */
+ in[pn_Start_X_initial_exec] = new_Jmp();
+ in[pn_Start_M] = get_Call_mem(call);
+ in[pn_Start_P_frame_base] = get_irg_frame(current_ir_graph);
+ in[pn_Start_P_globals] = get_irg_globals(current_ir_graph);
+ in[pn_Start_P_tls] = get_irg_tls(current_ir_graph);
+ in[pn_Start_T_args] = new_Tuple(get_Call_n_params(call), get_Call_param_arr(call));
+ /* in[pn_Start_P_value_arg_base] = ??? */
+ assert(pn_Start_P_value_arg_base == pn_Start_max - 1 && "pn_Start_P_value_arg_base not supported, fix");
+ pre_call = new_Tuple(pn_Start_max - 1, in);
+ post_call = call;
+
+ /* --
+ The new block gets the ins of the old block, pre_call and all its
+ predecessors and all Phi nodes. -- */
+ part_block(pre_call);
+
+ /* -- Prepare state for dead node elimination -- */
+ /* Visited flags in calling irg must be >= flag in called irg.
+ Else walker and arity computation will not work. */
+ if (get_irg_visited(current_ir_graph) <= get_irg_visited(called_graph))
+ set_irg_visited(current_ir_graph, get_irg_visited(called_graph)+1);
+ if (get_irg_block_visited(current_ir_graph)< get_irg_block_visited(called_graph))
+ set_irg_block_visited(current_ir_graph, get_irg_block_visited(called_graph));
+ /* Set pre_call as new Start node in link field of the start node of
+ calling graph and pre_calls block as new block for the start block
+ of calling graph.
+ Further mark these nodes so that they are not visited by the
+ copying. */
+ set_irn_link(get_irg_start(called_graph), pre_call);
+ set_irn_visited(get_irg_start(called_graph), get_irg_visited(current_ir_graph));
+ set_irn_link(get_irg_start_block(called_graph), get_nodes_block(pre_call));
+ set_irn_visited(get_irg_start_block(called_graph), get_irg_visited(current_ir_graph));
+ set_irn_link(get_irg_bad(called_graph), get_irg_bad(current_ir_graph));
+ set_irn_visited(get_irg_bad(called_graph), get_irg_visited(current_ir_graph));
+
+ /* Initialize for compaction of in arrays */
+ inc_irg_block_visited(current_ir_graph);
+
+ /* -- Replicate local entities of the called_graph -- */
+ /* copy the entities. */
+ called_frame = get_irg_frame_type(called_graph);
+ curr_frame = get_irg_frame_type(current_ir_graph);
+ for (i = 0, n = get_class_n_members(called_frame); i < n; ++i) {
+ ir_entity *new_ent, *old_ent;
+ old_ent = get_class_member(called_frame, i);
+ new_ent = copy_entity_own(old_ent, curr_frame);
+ set_entity_link(old_ent, new_ent);
+ }
+
+ /* visited is > than that of called graph. With this trick visited will
+ remain unchanged so that an outer walker, e.g., searching the call nodes
+ to inline, calling this inline will not visit the inlined nodes. */
+ set_irg_visited(current_ir_graph, get_irg_visited(current_ir_graph)-1);
+
+ /* -- Performing dead node elimination inlines the graph -- */
+ /* Copies the nodes to the obstack of current_ir_graph. Updates links to new
+ entities. */
+ irg_walk(get_irg_end(called_graph), copy_node_inline, copy_preds,
+ get_irg_frame_type(called_graph));
+
+ /* Repair called_graph */
+ set_irg_visited(called_graph, get_irg_visited(current_ir_graph));
+ set_irg_block_visited(called_graph, get_irg_block_visited(current_ir_graph));
+ set_Block_block_visited(get_irg_start_block(called_graph), 0);
+
+ /* -- Merge the end of the inlined procedure with the call site -- */
+ /* We will turn the old Call node into a Tuple with the following
+ predecessors:
+ -1: Block of Tuple.
+ 0: Phi of all Memories of Return statements.
+ 1: Jmp from new Block that merges the control flow from all exception
+ predecessors of the old end block.
+ 2: Tuple of all arguments.
+ 3: Phi of Exception memories.
+ In case the old Call directly branches to End on an exception we don't
+ need the block merging all exceptions nor the Phi of the exception
+ memories.
+ */
+
+ /* -- Precompute some values -- */
+ end_bl = get_new_node(get_irg_end_block(called_graph));
+ end = get_new_node(get_irg_end(called_graph));
+ arity = get_irn_arity(end_bl); /* arity = n_exc + n_ret */
+ n_res = get_method_n_ress(get_Call_type(call));
+
+ res_pred = xmalloc(n_res * sizeof(*res_pred));
+ cf_pred = xmalloc(arity * sizeof(*res_pred));
+
+ set_irg_current_block(current_ir_graph, post_bl); /* just to make sure */
+
+ /* -- archive keepalives -- */
+ irn_arity = get_irn_arity(end);
+ for (i = 0; i < irn_arity; i++) {
+ ir_node *ka = get_End_keepalive(end, i);
+ if (! is_Bad(ka))
+ add_End_keepalive(get_irg_end(current_ir_graph), ka);
+ }
+
+ /* The new end node will die. We need not free as the in array is on the obstack:
+ copy_node() only generated 'D' arrays. */
+
+ /* -- Replace Return nodes by Jump nodes. -- */
+ n_ret = 0;
+ for (i = 0; i < arity; i++) {
+ ir_node *ret;
+ ret = get_irn_n(end_bl, i);
+ if (is_Return(ret)) {
+ cf_pred[n_ret] = new_r_Jmp(current_ir_graph, get_nodes_block(ret));
+ n_ret++;
+ }
+ }
+ set_irn_in(post_bl, n_ret, cf_pred);
+
+ /* -- Build a Tuple for all results of the method.
+ Add Phi node if there was more than one Return. -- */
+ turn_into_tuple(post_call, pn_Call_max);
+ /* First the Memory-Phi */
+ n_ret = 0;
+ for (i = 0; i < arity; i++) {
+ ret = get_irn_n(end_bl, i);
+ if (is_Return(ret)) {
+ cf_pred[n_ret] = get_Return_mem(ret);
+ n_ret++;
+ }
+ }
+ phi = new_Phi(n_ret, cf_pred, mode_M);
+ set_Tuple_pred(call, pn_Call_M_regular, phi);
+ /* Conserve Phi-list for further inlinings -- but might be optimized */
+ if (get_nodes_block(phi) == post_bl) {
+ set_irn_link(phi, get_irn_link(post_bl));
+ set_irn_link(post_bl, phi);
+ }
+ /* Now the real results */
+ if (n_res > 0) {
+ for (j = 0; j < n_res; j++) {
+ n_ret = 0;
+ for (i = 0; i < arity; i++) {
+ ret = get_irn_n(end_bl, i);
+ if (is_Return(ret)) {
+ cf_pred[n_ret] = get_Return_res(ret, j);
+ n_ret++;
+ }
+ }
+ if (n_ret > 0)
+ phi = new_Phi(n_ret, cf_pred, get_irn_mode(cf_pred[0]));
+ else
+ phi = new_Bad();
+ res_pred[j] = phi;
+ /* Conserve Phi-list for further inlinings -- but might be optimized */
+ if (get_nodes_block(phi) == post_bl) {
+ set_Phi_next(phi, get_Block_phis(post_bl));
+ set_Block_phis(post_bl, phi);
+ }
+ }
+ set_Tuple_pred(call, pn_Call_T_result, new_Tuple(n_res, res_pred));
+ } else {
+ set_Tuple_pred(call, pn_Call_T_result, new_Bad());
+ }
+ /* handle the regular call */
+ set_Tuple_pred(call, pn_Call_X_regular, new_Jmp());
+
+ /* For now, we cannot inline calls with value_base */
+ set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
+
+ /* Finally the exception control flow.
+ We have two (three) possible situations:
+ First if the Call branches to an exception handler: We need to add a Phi node to
+ collect the memory containing the exception objects. Further we need
+ to add another block to get a correct representation of this Phi. To
+ this block we add a Jmp that resolves into the X output of the Call
+ when the Call is turned into a tuple.
+ Second the Call branches to End, the exception is not handled. Just
+ add all inlined exception branches to the End node.
+ Third: there is no Exception edge at all. Handle as case two. */
+ if (exc_handling == exc_handler) {
+ n_exc = 0;
+ for (i = 0; i < arity; i++) {
+ ir_node *ret, *irn;
+ ret = get_irn_n(end_bl, i);
+ irn = skip_Proj(ret);
+ if (is_fragile_op(irn) || is_Raise(irn)) {
+ cf_pred[n_exc] = ret;
+ ++n_exc;
+ }
+ }
+ if (n_exc > 0) {
+ new_Block(n_exc, cf_pred); /* watch it: current_block is changed! */
+ set_Tuple_pred(call, pn_Call_X_except, new_Jmp());
+ /* The Phi for the memories with the exception objects */
+ n_exc = 0;
+ for (i = 0; i < arity; i++) {
+ ir_node *ret;
+ ret = skip_Proj(get_irn_n(end_bl, i));
+ if (is_Call(ret)) {
+ cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 3);
+ n_exc++;
+ } else if (is_fragile_op(ret)) {
+ /* We rely that all cfops have the memory output at the same position. */
+ cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 0);
+ n_exc++;
+ } else if (is_Raise(ret)) {
+ cf_pred[n_exc] = new_r_Proj(current_ir_graph, get_nodes_block(ret), ret, mode_M, 1);
+ n_exc++;
+ }
+ }
+ set_Tuple_pred(call, pn_Call_M_except, new_Phi(n_exc, cf_pred, mode_M));
+ } else {
+ set_Tuple_pred(call, pn_Call_X_except, new_Bad());
+ set_Tuple_pred(call, pn_Call_M_except, new_Bad());
+ }
+ } else {
+ ir_node *main_end_bl;
+ int main_end_bl_arity;
+ ir_node **end_preds;
+
+ /* assert(exc_handling == 1 || no exceptions. ) */
+ n_exc = 0;
+ for (i = 0; i < arity; i++) {
+ ir_node *ret = get_irn_n(end_bl, i);
+ ir_node *irn = skip_Proj(ret);
+
+ if (is_fragile_op(irn) || is_Raise(irn)) {
+ cf_pred[n_exc] = ret;
+ n_exc++;
+ }
+ }
+ main_end_bl = get_irg_end_block(current_ir_graph);
+ main_end_bl_arity = get_irn_arity(main_end_bl);
+ end_preds = xmalloc((n_exc + main_end_bl_arity) * sizeof(*end_preds));
+
+ for (i = 0; i < main_end_bl_arity; ++i)
+ end_preds[i] = get_irn_n(main_end_bl, i);
+ for (i = 0; i < n_exc; ++i)
+ end_preds[main_end_bl_arity + i] = cf_pred[i];
+ set_irn_in(main_end_bl, n_exc + main_end_bl_arity, end_preds);
+ set_Tuple_pred(call, pn_Call_X_except, new_Bad());
+ set_Tuple_pred(call, pn_Call_M_except, new_Bad());
+ free(end_preds);
+ }
+ free(res_pred);
+ free(cf_pred);
+
+ /* -- Turn CSE back on. -- */
+ set_optimize(rem_opt);
+
+ return 1;
+}
+
+/********************************************************************/
+/* Apply inlineing to small methods. */
+/********************************************************************/
+
+/** Represents a possible inlinable call in a graph. */
+typedef struct _call_entry call_entry;
+struct _call_entry {
+ ir_node *call; /**< the Call */
+ ir_graph *callee; /**< the callee called here */
+ call_entry *next; /**< for linking the next one */
+ unsigned weight; /**< the weight of the call */
+};
+
+/**
+ * environment for inlining small irgs
+ */
+typedef struct _inline_env_t {
+ struct obstack obst; /**< an obstack where call_entries are allocated on. */
+ call_entry *head; /**< the head of the call entry list */
+ call_entry *tail; /**< the tail of the call entry list */
+} inline_env_t;
+
+/**
+ * Returns the irg called from a Call node. If the irg is not
+ * known, NULL is returned.
+ *
+ * @param call the call node
+ */
+static ir_graph *get_call_called_irg(ir_node *call) {
+ ir_node *addr;
+
+ addr = get_Call_ptr(call);
+ if (is_Global(addr)) {
+ ir_entity *ent = get_Global_entity(addr);
+ return get_entity_irg(ent);
+ }
+
+ return NULL;
+}
+
+/**
+ * Walker: Collect all calls to known graphs inside a graph.
+ */
+static void collect_calls(ir_node *call, void *env) {
+ if (is_Call(call)) {
+ ir_graph *called_irg = get_call_called_irg(call);
+
+ if (called_irg != NULL) {
+ /* The Call node calls a locally defined method. Remember to inline. */
+ inline_env_t *ienv = env;
+ call_entry *entry = obstack_alloc(&ienv->obst, sizeof(*entry));
+ entry->call = call;
+ entry->callee = called_irg;
+ entry->next = NULL;
+ entry->weight = 0;
+
+ if (ienv->tail == NULL)
+ ienv->head = entry;
+ else
+ ienv->tail->next = entry;
+ ienv->tail = entry;
+ }
+ }
+}
+
+/**
+ * Inlines all small methods at call sites where the called address comes
+ * from a Const node that references the entity representing the called
+ * method.
+ * The size argument is a rough measure for the code size of the method:
+ * Methods where the obstack containing the firm graph is smaller than
+ * size are inlined.
+ */
+void inline_small_irgs(ir_graph *irg, int size) {
+ ir_graph *rem = current_ir_graph;
+ inline_env_t env;
+ call_entry *entry;
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
+
+ FIRM_DBG_REGISTER(dbg, "firm.opt.inline");
+
+ current_ir_graph = irg;
+ /* Handle graph state */
+ assert(get_irg_phase_state(irg) != phase_building);
+ free_callee_info(irg);
+
+ /* Find Call nodes to inline.
+ (We can not inline during a walk of the graph, as inlineing the same
+ method several times changes the visited flag of the walked graph:
+ after the first inlineing visited of the callee equals visited of
+ the caller. With the next inlineing both are increased.) */
+ obstack_init(&env.obst);
+ env.head = env.tail = NULL;
+ irg_walk_graph(irg, NULL, collect_calls, &env);
+
+ if (env.head != NULL) {
+ /* There are calls to inline */
+ collect_phiprojs(irg);
+ for (entry = env.head; entry != NULL; entry = entry->next) {
+ ir_graph *callee = entry->callee;
+ if (((_obstack_memory_used(callee->obst) - (int)obstack_room(callee->obst)) < size) ||
+ (get_irg_inline_property(callee) >= irg_inline_forced)) {
+ inline_method(entry->call, callee);
+ }
+ }
+ }
+ obstack_free(&env.obst, NULL);
+ current_ir_graph = rem;
+}
+
+/**
+ * Environment for inlining irgs.
+ */
+typedef struct {
+ int n_nodes; /**< Number of nodes in graph except Id, Tuple, Proj, Start, End. */
+ int n_nodes_orig; /**< for statistics */
+ call_entry *call_head; /**< The head of the list of all call nodes in this graph. */
+ call_entry *call_tail; /**< The tail of the list of all call nodes in this graph .*/
+ int n_call_nodes; /**< Number of Call nodes in the graph. */
+ int n_call_nodes_orig; /**< for statistics */
+ int n_callers; /**< Number of known graphs that call this graphs. */
+ int n_callers_orig; /**< for statistics */
+ int got_inline; /**< Set, if at leat one call inside this graph was inlined. */
+} inline_irg_env;
+
+/**
+ * Allocate a new environment for inlining.
+ */
+static inline_irg_env *alloc_inline_irg_env(struct obstack *obst) {
+ inline_irg_env *env = obstack_alloc(obst, sizeof(*env));
+ env->n_nodes = -2; /* do not count count Start, End */
+ env->n_nodes_orig = -2; /* do not count Start, End */
+ env->call_head = NULL;
+ env->call_tail = NULL;
+ env->n_call_nodes = 0;
+ env->n_call_nodes_orig = 0;
+ env->n_callers = 0;
+ env->n_callers_orig = 0;
+ env->got_inline = 0;
+ return env;
+}
+
+typedef struct walker_env {
+ struct obstack *obst; /**< the obstack for allocations. */
+ inline_irg_env *x; /**< the inline environment */
+ char ignore_runtime; /**< the ignore runtime flag */
+ char ignore_callers; /**< if set, do change callers data */
+} wenv_t;
+
+/**
+ * post-walker: collect all calls in the inline-environment
+ * of a graph and sum some statistics.
+ */
+static void collect_calls2(ir_node *call, void *ctx) {
+ wenv_t *env = ctx;
+ inline_irg_env *x = env->x;
+ ir_opcode code = get_irn_opcode(call);
+ ir_graph *callee;
+ call_entry *entry;
+
+ /* count meaningful nodes in irg */
+ if (code != iro_Proj && code != iro_Tuple && code != iro_Sync) {
+ ++x->n_nodes;
+ ++x->n_nodes_orig;
+ }
+
+ if (code != iro_Call) return;
+
+ /* check, if it's a runtime call */
+ if (env->ignore_runtime) {
+ ir_node *symc = get_Call_ptr(call);
+
+ if (is_Global(symc)) {
+ ir_entity *ent = get_Global_entity(symc);
+
+ if (get_entity_additional_properties(ent) & mtp_property_runtime)
+ return;
+ }
+ }
+
+ /* collect all call nodes */
+ ++x->n_call_nodes;
+ ++x->n_call_nodes_orig;
+
+ callee = get_call_called_irg(call);
+ if (callee != NULL) {
+ if (! env->ignore_callers) {
+ inline_irg_env *callee_env = get_irg_link(callee);
+ /* count all static callers */
+ ++callee_env->n_callers;
+ ++callee_env->n_callers_orig;
+ }
+
+ /* link it in the list of possible inlinable entries */
+ entry = obstack_alloc(env->obst, sizeof(*entry));
+ entry->call = call;
+ entry->callee = callee;
+ entry->next = NULL;
+ if (x->call_tail == NULL)
+ x->call_head = entry;
+ else
+ x->call_tail->next = entry;
+ x->call_tail = entry;
+ }
+}
+
+/**
+ * Returns TRUE if the number of callers is 0 in the irg's environment,
+ * hence this irg is a leave.
+ */
+INLINE static int is_leave(ir_graph *irg) {
+ inline_irg_env *env = get_irg_link(irg);
+ return env->n_call_nodes == 0;
+}
+
+/**
+ * Returns TRUE if the number of nodes in the callee is
+ * smaller then size in the irg's environment.
+ */
+INLINE static int is_smaller(ir_graph *callee, int size) {
+ inline_irg_env *env = get_irg_link(callee);
+ return env->n_nodes < size;
+}
+
+/**
+ * Append the nodes of the list src to the nodes of the list in environment dst.
+ */
+static void append_call_list(struct obstack *obst, inline_irg_env *dst, call_entry *src) {
+ call_entry *entry, *nentry;
+
+ /* Note that the src list points to Call nodes in the inlined graph, but
+ we need Call nodes in our graph. Luckily the inliner leaves this information
+ in the link field. */
+ for (entry = src; entry != NULL; entry = entry->next) {
+ nentry = obstack_alloc(obst, sizeof(*nentry));
+ nentry->call = get_irn_link(entry->call);
+ nentry->callee = entry->callee;
+ nentry->next = NULL;
+ dst->call_tail->next = nentry;
+ dst->call_tail = nentry;
+ }
+}
+
+/*
+ * Inlines small leave methods at call sites where the called address comes
+ * from a Const node that references the entity representing the called
+ * method.
+ * The size argument is a rough measure for the code size of the method:
+ * Methods where the obstack containing the firm graph is smaller than
+ * size are inlined.
+ */
+void inline_leave_functions(int maxsize, int leavesize, int size, int ignore_runtime) {
+ inline_irg_env *env;
+ ir_graph *irg;
+ int i, n_irgs;
+ ir_graph *rem;
+ int did_inline;
+ wenv_t wenv;
+ call_entry *entry, *tail;
+ const call_entry *centry;
+ struct obstack obst;
+ pmap *copied_graphs;
+ pmap_entry *pm_entry;
+ DEBUG_ONLY(firm_dbg_module_t *dbg;)
+
+ FIRM_DBG_REGISTER(dbg, "firm.opt.inline");
+ rem = current_ir_graph;
+ obstack_init(&obst);
+
+ /* a map for the copied graphs, used to inline recursive calls */
+ copied_graphs = pmap_create();
+
+ /* extend all irgs by a temporary data structure for inlining. */
+ n_irgs = get_irp_n_irgs();
+ for (i = 0; i < n_irgs; ++i)
+ set_irg_link(get_irp_irg(i), alloc_inline_irg_env(&obst));
+
+ /* Precompute information in temporary data structure. */
+ wenv.obst = &obst;
+ wenv.ignore_runtime = ignore_runtime;
+ wenv.ignore_callers = 0;
+ for (i = 0; i < n_irgs; ++i) {
+ ir_graph *irg = get_irp_irg(i);
+
+ assert(get_irg_phase_state(irg) != phase_building);
+ free_callee_info(irg);
+
+ wenv.x = get_irg_link(irg);
+ irg_walk_graph(irg, NULL, collect_calls2, &wenv);
+ }
+
+ /* -- and now inline. -- */
+
+ /* Inline leaves recursively -- we might construct new leaves. */
+ do {
+ did_inline = 0;
+
+ for (i = 0; i < n_irgs; ++i) {
+ ir_node *call;
+ int phiproj_computed = 0;
+
+ current_ir_graph = get_irp_irg(i);
+ env = (inline_irg_env *)get_irg_link(current_ir_graph);
+
+ tail = NULL;
+ for (entry = env->call_head; entry != NULL; entry = entry->next) {
+ ir_graph *callee;
+
+ if (env->n_nodes > maxsize) break;
+
+ call = entry->call;
+ callee = entry->callee;
+
+ if (is_leave(callee) && (
+ is_smaller(callee, leavesize) || (get_irg_inline_property(callee) >= irg_inline_forced))) {
+ if (!phiproj_computed) {
+ phiproj_computed = 1;
+ collect_phiprojs(current_ir_graph);
+ }
+ did_inline = inline_method(call, callee);
+
+ if (did_inline) {
+ inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
+
+ /* was inlined, must be recomputed */
+ phiproj_computed = 0;
+
+ /* Do some statistics */
+ env->got_inline = 1;
+ --env->n_call_nodes;
+ env->n_nodes += callee_env->n_nodes;
+ --callee_env->n_callers;
+
+ /* remove this call from the list */
+ if (tail != NULL)
+ tail->next = entry->next;
+ else
+ env->call_head = entry->next;
+ continue;
+ }
+ }
+ tail = entry;
+ }
+ env->call_tail = tail;
+ }
+ } while (did_inline);
+
+ /* inline other small functions. */
+ for (i = 0; i < n_irgs; ++i) {
+ ir_node *call;
+ int phiproj_computed = 0;
+
+ current_ir_graph = get_irp_irg(i);
+ env = (inline_irg_env *)get_irg_link(current_ir_graph);
+
+ /* note that the list of possible calls is updated during the process */
+ tail = NULL;
+ for (entry = env->call_head; entry != NULL; entry = entry->next) {
+ ir_graph *callee;
+ pmap_entry *e;
+
+ call = entry->call;
+ callee = entry->callee;
+
+ e = pmap_find(copied_graphs, callee);
+ if (e != NULL) {
+ /*
+ * Remap callee if we have a copy.
+ * FIXME: Should we do this only for recursive Calls ?
+ */
+ callee = e->value;
+ }
+
+ if (((is_smaller(callee, size) && (env->n_nodes < maxsize)) || /* small function */
+ (get_irg_inline_property(callee) >= irg_inline_forced))) {
+ if (current_ir_graph == callee) {
+ /*
+ * Recursive call: we cannot directly inline because we cannot walk
+ * the graph and change it. So we have to make a copy of the graph
+ * first.
+ */
+
+ inline_irg_env *callee_env;
+ ir_graph *copy;
+
+ /*
+ * No copy yet, create one.
+ * Note that recursive methods are never leaves, so it is sufficient
+ * to test this condition here.
+ */
+ copy = create_irg_copy(callee);
+
+ /* create_irg_copy() destroys the Proj links, recompute them */
+ phiproj_computed = 0;
+
+ /* allocate new environment */
+ callee_env = alloc_inline_irg_env(&obst);
+ set_irg_link(copy, callee_env);
+
+ wenv.x = callee_env;
+ wenv.ignore_callers = 1;
+ irg_walk_graph(copy, NULL, collect_calls2, &wenv);
+
+ /*
+ * Enter the entity of the original graph. This is needed
+ * for inline_method(). However, note that ent->irg still points
+ * to callee, NOT to copy.
+ */
+ set_irg_entity(copy, get_irg_entity(callee));
+
+ pmap_insert(copied_graphs, callee, copy);
+ callee = copy;
+
+ /* we have only one caller: the original graph */
+ callee_env->n_callers = 1;
+ callee_env->n_callers_orig = 1;
+ }
+ if (! phiproj_computed) {
+ phiproj_computed = 1;
+ collect_phiprojs(current_ir_graph);
+ }
+ did_inline = inline_method(call, callee);
+ if (did_inline) {
+ inline_irg_env *callee_env = (inline_irg_env *)get_irg_link(callee);
+
+ /* was inlined, must be recomputed */
+ phiproj_computed = 0;
+
+ /* callee was inline. Append it's call list. */
+ env->got_inline = 1;
+ --env->n_call_nodes;
+ append_call_list(&obst, env, callee_env->call_head);
+ env->n_call_nodes += callee_env->n_call_nodes;
+ env->n_nodes += callee_env->n_nodes;
+ --callee_env->n_callers;
+
+ /* after we have inlined callee, all called methods inside callee
+ are now called once more */
+ for (centry = callee_env->call_head; centry != NULL; centry = centry->next) {
+ inline_irg_env *penv = get_irg_link(centry->callee);
+ ++penv->n_callers;
+ }
+
+ /* remove this call from the list */
+ if (tail != NULL)
+ tail->next = entry->next;
+ else
+ env->call_head = entry->next;
+ continue;
+ }
+ }
+ tail = entry;
+ }
+ env->call_tail = tail;
+ }
+
+ for (i = 0; i < n_irgs; ++i) {
+ irg = get_irp_irg(i);
+ env = (inline_irg_env *)get_irg_link(irg);
+
+ if (env->got_inline) {
+ /* this irg got calls inlined */
+ set_irg_outs_inconsistent(irg);
+ set_irg_doms_inconsistent(irg);
+
+ optimize_graph_df(irg);
+ optimize_cf(irg);
+ }
+ if (env->got_inline || (env->n_callers_orig != env->n_callers)) {
+ DB((dbg, SET_LEVEL_1, "Nodes:%3d ->%3d, calls:%3d ->%3d, callers:%3d ->%3d, -- %s\n",
+ env->n_nodes_orig, env->n_nodes, env->n_call_nodes_orig, env->n_call_nodes,
+ env->n_callers_orig, env->n_callers,
+ get_entity_name(get_irg_entity(irg))));
+ }
+ }
+
+ /* kill the copied graphs: we don't need them anymore */
+ foreach_pmap(copied_graphs, pm_entry) {
+ ir_graph *copy = pm_entry->value;
+
+ /* reset the entity, otherwise it will be deleted in the next step ... */
+ set_irg_entity(copy, NULL);
+ free_ir_graph(copy);
+ }
+ pmap_destroy(copied_graphs);
+
+ obstack_free(&obst, NULL);
+ current_ir_graph = rem;
+}