* @file
* @brief Support for ir graph modification.
* @author Martin Trapp, Christian Schaefer, Goetz Lindenmaier
- * @version $Id$
*/
#include "config.h"
-#include "irvrfy.h"
#include "irflag_t.h"
#include "irgwalk.h"
#include "irnode_t.h"
#include "irtools.h"
#include "error.h"
-/**
- * Turns a node into a "useless" Tuple. The Tuple just forms a tuple
- * from several inputs.
- * This is useful if a node returning a tuple is removed, but the Projs
- * extracting values from the tuple are not available.
- */
-void turn_into_tuple(ir_node *node, int arity) {
- assert(node);
- set_irn_op(node, op_Tuple);
- if (get_irn_arity(node) == arity) {
- /* keep old array */
- } else {
- ir_graph *irg = get_irn_irg(node);
- ir_node *block = get_nodes_block(node);
- edges_node_deleted(node, irg);
- /* Allocate new array, don't free old in_array, it's on the obstack. */
- node->in = NEW_ARR_D(ir_node *, irg->obst, arity+1);
- /* clear the new in array, else edge_notify tries to delete garbage */
- memset(node->in, 0, (arity+1) * sizeof(node->in[0]));
- /* set the block back */
- set_nodes_block(node, block);
+void turn_into_tuple(ir_node *node, int arity)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node **in = ALLOCAN(ir_node*, arity);
+ ir_node *bad = new_r_Bad(irg, mode_ANY);
+ int i;
+
+ /* construct a new in array, with every input being bad */
+ for (i = 0; i < arity; ++i) {
+ in[i] = bad;
}
+ set_irn_in(node, arity, in);
+ set_irn_op(node, op_Tuple);
}
-/**
- * Insert irnode `new' in place of irnode `old'
- * Since `new' may be bigger than `old' replace `old'
- * by an op_Id which is smaller than everything.
- */
-void exchange(ir_node *old, ir_node *nw) {
+void exchange(ir_node *old, ir_node *nw)
+{
ir_graph *irg;
assert(old && nw);
/* copy all dependencies from old to new */
add_irn_deps(nw, old);
- edges_reroute(old, nw, irg);
- edges_reroute_kind(old, nw, EDGE_KIND_DEP, irg);
- edges_node_deleted(old, irg);
- old->op = op_Bad;
+ edges_reroute(old, nw);
+ edges_reroute_kind(old, nw, EDGE_KIND_DEP);
+ edges_node_deleted(old);
+ /* noone is allowed to reference this node anymore */
+ set_irn_op(old, op_Deleted);
} else {
/* Else, do it the old-fashioned way. */
ir_node *block;
old->in[0] = block;
old->in[1] = nw;
}
-}
-/*--------------------------------------------------------------------*/
-/* Functionality for collect_phis */
-/*--------------------------------------------------------------------*/
+ /* update irg flags */
+ clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS
+ | IR_GRAPH_PROPERTY_CONSISTENT_LOOPINFO);
+}
/**
* Walker: links all Phi nodes to their Blocks lists,
- * all Proj nodes to there predecessors and all
- * partBlocks to there MacroBlock header.
+ * all Proj nodes to there predecessors.
*/
-static void collect_phiprojs_walker(ir_node *n, void *env) {
+static void collect_phiprojs_walker(ir_node *n, void *env)
+{
ir_node *pred;
(void) env;
set_irn_link(n, get_irn_link(pred));
set_irn_link(pred, n);
- } else if (is_Block(n)) {
- ir_node *mbh = get_Block_MacroBlock(n);
-
- if (mbh != n) {
- set_irn_link(n, get_irn_link(mbh));
- set_irn_link(mbh, n);
- }
}
}
-void collect_phiprojs(ir_graph *irg) {
+void collect_phiprojs(ir_graph *irg)
+{
assert((ir_resources_reserved(irg) & (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST)) ==
(IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST));
irg_walk_graph(irg, firm_clear_node_and_phi_links, collect_phiprojs_walker, NULL);
}
-/*--------------------------------------------------------------------*/
-/* Functionality for part_block */
-/*--------------------------------------------------------------------*/
-
/**
* Moves node and all predecessors of node from from_bl to to_bl.
* Does not move predecessors of Phi nodes (or block nodes).
*/
-static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl) {
+static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl)
+{
int i, arity;
/* move this node */
/* move its Projs */
if (get_irn_mode(node) == mode_T) {
- ir_node *proj = get_irn_link(node);
+ ir_node *proj = (ir_node*)get_irn_link(node);
while (proj) {
if (get_nodes_block(proj) == from_bl)
set_nodes_block(proj, to_bl);
- proj = get_irn_link(proj);
+ proj = (ir_node*)get_irn_link(proj);
}
}
- /* recursion ... */
if (is_Phi(node))
return;
+ /* recursion ... */
arity = get_irn_arity(node);
for (i = 0; i < arity; i++) {
ir_node *pred = get_irn_n(node, i);
}
}
-void part_block(ir_node *node) {
- ir_node *new_block, *old_block, *mbh;
- ir_node *phi, *jmp, *next, *block;
- ir_graph *rem = current_ir_graph;
+static void move_projs(const ir_node *node, ir_node *to_bl)
+{
+ if (get_irn_mode(node) != mode_T)
+ return;
- current_ir_graph = get_irn_irg(node);
+ foreach_out_edge(node, edge) {
+ ir_node *proj = get_edge_src_irn(edge);
+ if (!is_Proj(proj))
+ continue;
+ set_nodes_block(proj, to_bl);
+ move_projs(proj, to_bl);
+ }
+}
+
+/**
+ * Moves node and all predecessors of node from from_bl to to_bl.
+ * Does not move predecessors of Phi nodes (or block nodes).
+ */
+static void move_edges(ir_node *node, ir_node *from_bl, ir_node *to_bl)
+{
+ int i, arity;
+
+ /* move this node */
+ set_nodes_block(node, to_bl);
+
+ /* move its Projs */
+ move_projs(node, to_bl);
+
+ /* We must not move predecessors of Phi nodes, even if they are in
+ * from_bl. (because these are values from an earlier loop iteration
+ * which are not predecessors of node here)
+ */
+ if (is_Phi(node))
+ return;
+
+ /* recursion ... */
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ ir_node *pred = get_irn_n(node, i);
+ if (get_nodes_block(pred) == from_bl)
+ move_edges(pred, from_bl, to_bl);
+ }
+}
+
+void part_block(ir_node *node)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *new_block, *old_block;
+ ir_node *phi, *jmp;
/* Turn off optimizations so that blocks are not merged again. */
int rem_opt = get_opt_optimize();
/* Transform the control flow */
old_block = get_nodes_block(node);
- mbh = get_Block_MacroBlock(old_block);
- new_block = new_Block(get_Block_n_cfgpreds(old_block),
- get_Block_cfgpred_arr(old_block));
-
- if (mbh != old_block) {
- /* we splitting a partBlock */
- set_Block_MacroBlock(new_block, mbh);
- } else {
- /* we are splitting a header: this creates a new header */
- set_Block_MacroBlock(new_block, new_block);
- }
+ new_block = new_r_Block(irg, get_Block_n_cfgpreds(old_block),
+ get_Block_cfgpred_arr(old_block));
/* create a jump from new_block to old_block, which is now the lower one */
jmp = new_r_Jmp(new_block);
phi = get_Phi_next(phi);
}
- /* rewire partBlocks: This is necessary, because old_block is a new MacroBlock
- header now */
- if (mbh != old_block) {
- ir_node *list = NULL;
-
- /* move blocks from mbh to old_block if old_block dominates them */
- block = get_irn_link(mbh);
-
- /* mbh's list will be rebuild */
- set_irn_link(mbh, NULL);
- /* old_block is a new mbh */
- set_Block_MacroBlock(old_block, old_block);
-
- /* note that we must splice the list of partBlock here */
- for (; block != NULL; block = next) {
- ir_node *curr = block;
- assert(is_Block(curr));
+ set_optimize(rem_opt);
+}
- next = get_irn_link(block);
+ir_node *part_block_edges(ir_node *node)
+{
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *old_block = get_nodes_block(node);
+ ir_node *new_block = new_r_Block(irg, get_Block_n_cfgpreds(old_block), get_Block_cfgpred_arr(old_block));
- if (block == old_block) {
- /* this effectively removed old_block from mbh's list */
- continue;
- }
+ /* old_block has no predecessors anymore for now */
+ set_irn_in(old_block, 0, NULL);
- assert(get_Block_MacroBlock(curr) == mbh);
-
- for (;;) {
- if (curr == old_block) {
- /* old_block dominates the block, so old_block will be
- the new macro block header */
- set_Block_MacroBlock(block, old_block);
- set_irn_link(block, list);
- list = block;
- break;
- }
- if (curr == mbh) {
- /* leave it in the mbh */
- set_irn_link(block, get_irn_link(mbh));
- set_irn_link(mbh, block);
- break;
- }
-
- assert(get_Block_n_cfgpreds(curr) == 1);
- curr = get_Block_cfgpred_block(curr, 0);
- }
- }
- /* beware: do NOT directly manipulate old_block's list, as old_block is
- in mbh's list and this would destroy the list! */
- set_irn_link(old_block, list);
+ /* move node and its predecessors to new_block */
+ move_edges(node, old_block, new_block);
- /* finally add new_block to mbh's list */
- set_irn_link(new_block, get_irn_link(mbh));
- set_irn_link(mbh, new_block);
- } else {
- /* old_block is the mbh, as well as new_block */
- set_Block_MacroBlock(new_block, new_block);
+ /* move Phi nodes to new_block */
+ foreach_out_edge_safe(old_block, edge) {
+ ir_node *phi = get_edge_src_irn(edge);
+ if (!is_Phi(phi))
+ continue;
+ set_nodes_block(phi, new_block);
}
- set_optimize(rem_opt);
- current_ir_graph = rem;
+ return old_block;
}
-/* kill a node by setting its predecessors to Bad and finally exchange the node by Bad itself. */
-void kill_node(ir_node *node) {
+void kill_node(ir_node *node)
+{
ir_graph *irg = get_irn_irg(node);
- ir_node *bad = get_irg_bad(irg);
- int i;
- for (i = get_irn_arity(node) - 1; i >= -1; --i) {
- set_irn_n(node, i, bad);
+ if (edges_activated(irg)) {
+ edges_node_deleted(node);
}
- exchange(node, bad);
+ /* noone is allowed to reference this node anymore */
+ set_irn_op(node, op_Deleted);
}
projects / libfirm / blobdiff