* Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
*/
+ /**
+ * @file irouts.c Compute out edges for ir nodes (also called def-use edges).
+ *
+ * Copyright (C) 2002 by Universitaet Karlsruhe
+ * All rights reserved.
+ *
+ * Authors: Goetz Lindenmaier
+ */
-
- /* Copyright (C) 2002 by Universitaet Karlsruhe
-* All rights reserved.
-*
-* Authors: Goetz Lindenmaier
-*
-* irouts.c --- Compute out edges for ir nodes (also called def-use
-* edges).
-*
-*/
-
-/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include "xmalloc.h"
#include "irouts.h"
#include "irnode_t.h"
-#include "irgraph_t.h" /* To access irg->outs field (which is private to this module)
- without public access routine */
+#include "irgraph_t.h"
#include "irprog_t.h"
#include "irgwalk.h"
+#include "irtools.h"
-/**********************************************************************/
+#ifdef DEBUG_libfirm
+/* Note: ir_node.out_valid and ir_graph.n_outs are only present when DEBUG_libfirm is defined */
+/* Accesses to out_valid and n_outs are fenced out to avoid breakage
+ when compiling with neither DEBUG_libfirm or NDEBUG defined */
+#endif /* defined DEBUG_libfirm */
+
+/*--------------------------------------------------------------------*/
/** Accessing the out datastructures **/
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
+#ifdef DEBUG_libfirm
+/** Clear the outs of a node */
static void reset_outs (ir_node *node, void *unused)
{
node->out = NULL;
-#ifdef DEBUG_libfirm
node->out_valid = 0;
-#endif
}
+#endif
/* returns the number of successors of the node: */
-INLINE int get_irn_n_outs (ir_node *node) {
+int get_irn_n_outs (ir_node *node) {
+ assert(node && node->kind == k_ir_node);
#ifdef DEBUG_libfirm
- assert (node->out_valid);
-#endif
- return (int)(node->out[0]);
+ /* assert (node->out_valid); */
+#endif /* defined DEBUG_libfirm */
+ return PTR_TO_INT(node->out[0]);
}
/* Access successor n */
-INLINE ir_node *get_irn_out (ir_node *node, int pos) {
- assert(node);
+ir_node *get_irn_out (ir_node *node, int pos) {
assert(pos >= 0 && pos < get_irn_n_outs(node));
#ifdef DEBUG_libfirm
- assert (node->out_valid);
-#endif
+ /* assert (node->out_valid); */
+#endif /* defined DEBUG_libfirm */
return node->out[pos+1];
}
-INLINE void set_irn_out (ir_node *node, int pos, ir_node *out) {
+void set_irn_out (ir_node *node, int pos, ir_node *out) {
assert(node && out);
assert(pos >= 0 && pos < get_irn_n_outs(node));
#ifdef DEBUG_libfirm
- assert (node->out_valid);
-#endif
+ node->out_valid = 1; /* assume that this function is used correctly */
+#endif /* defined DEBUG_libfirm */
node->out[pos+1] = out;
}
+/* Return the number of control flow successors, ignore keep-alives. */
+int get_Block_n_cfg_outs(ir_node *bl) {
+ int i, n_cfg_outs = 0;
+ assert(bl && is_Block(bl));
+#ifdef DEBUG_libfirm
+ assert (bl->out_valid);
+#endif /* defined DEBUG_libfirm */
+ for (i = 1; i <= PTR_TO_INT(bl->out[0]); i++)
+ if ((get_irn_mode(bl->out[i]) == mode_X) &&
+ (get_irn_op(bl->out[i]) != op_End))
+ n_cfg_outs++;
+ return n_cfg_outs;
+}
-INLINE int get_Block_n_cfg_outs (ir_node *bl) {
+/* Return the number of control flow successors, honor keep-alives. */
+int get_Block_n_cfg_outs_ka(ir_node *bl) {
int i, n_cfg_outs = 0;
- assert(bl && (get_irn_op(bl) == op_Block));
+ assert(bl && is_Block(bl));
#ifdef DEBUG_libfirm
assert (bl->out_valid);
-#endif
- for (i = 0; i < (int)bl->out[0]; i++)
- if ((intern_get_irn_mode(bl->out[i+1]) == mode_X) &&
- (intern_get_irn_op(bl->out[i+1]) != op_End)) n_cfg_outs++;
+#endif /* defined DEBUG_libfirm */
+ for (i = 1; i <= PTR_TO_INT(bl->out[0]); i++)
+ if (get_irn_mode(bl->out[i]) == mode_X) {
+ /* ignore End if we are in the Endblock */
+ if (get_irn_op(bl->out[i]) == op_End &&
+ get_irn_n(bl->out[i], -1) == bl)
+ continue;
+ else
+ n_cfg_outs++;
+ }
return n_cfg_outs;
}
+/* Access predecessor n, ignore keep-alives. */
+ir_node *get_Block_cfg_out(ir_node *bl, int pos) {
+ int i, out_pos = 0;
+ assert(bl && is_Block(bl));
+#ifdef DEBUG_libfirm
+ assert (bl->out_valid);
+#endif /* defined DEBUG_libfirm */
+ for (i = 1; i <= PTR_TO_INT(bl->out[0]); i++)
+ if ((get_irn_mode(bl->out[i]) == mode_X) &&
+ (get_irn_op(bl->out[i]) != op_End)) {
+ if (out_pos == pos) {
+ ir_node *cfop = bl->out[i];
+ return cfop->out[1];
+ } else
+ out_pos++;
+ }
+ return NULL;
+}
-INLINE ir_node *get_Block_cfg_out (ir_node *bl, int pos) {
+/* Access predecessor n, honor keep-alives. */
+ir_node *get_Block_cfg_out_ka(ir_node *bl, int pos) {
int i, out_pos = 0;
- assert(bl && (get_irn_op(bl) == op_Block));
+ assert(bl && is_Block(bl));
#ifdef DEBUG_libfirm
assert (bl->out_valid);
-#endif
- for (i = 0; i < (int)bl->out[0]; i++)
- if ((intern_get_irn_mode(bl->out[i+1]) == mode_X) &&
- (intern_get_irn_op(bl->out[i+1]) != op_End)) {
+#endif /* defined DEBUG_libfirm */
+ for (i = 1; i <= PTR_TO_INT(bl->out[0]); i++)
+ if (get_irn_mode(bl->out[i]) == mode_X) {
+ /* ignore End if we are in the Endblock */
+ if (get_irn_op(bl->out[i]) == op_End &&
+ get_irn_n(bl->out[i], -1) == bl)
+ continue;
if (out_pos == pos) {
- ir_node *cfop = bl->out[i+1];
- return cfop->out[0+1];
- } else {
- out_pos++;
- }
+ ir_node *cfop = bl->out[i];
+ /* handle keep-alive here */
+ if (get_irn_op(cfop) == op_End)
+ return get_irn_n(cfop, -1);
+ return cfop->out[1];
+ } else
+ out_pos++;
}
return NULL;
}
-void irg_out_walk_2(ir_node *node, irg_walk_func *pre,
+static void irg_out_walk_2(ir_node *node, irg_walk_func *pre,
irg_walk_func *post, void *env) {
- int i;
+ int i, n;
ir_node *succ;
assert(node);
if (pre) pre(node, env);
- for (i = 0; i < get_irn_n_outs(node); i++) {
+ for (i = 0, n = get_irn_n_outs(node); i < n; i++) {
succ = get_irn_out(node, i);
if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
irg_out_walk_2(succ, pre, post, env);
irg_walk_func *pre, irg_walk_func *post,
void *env) {
assert(node);
- if (get_irg_outs_state(current_ir_graph) != no_outs) {
+ if (get_irg_outs_state(current_ir_graph) != outs_none) {
inc_irg_visited (current_ir_graph);
irg_out_walk_2(node, pre, post, env);
}
return;
}
-void irg_out_block_walk2(ir_node *bl,
+static void irg_out_block_walk2(ir_node *bl,
irg_walk_func *pre, irg_walk_func *post,
void *env) {
- int i;
+ int i, n;
- if(get_Block_block_visited(bl) < get_irg_block_visited(current_ir_graph)) {
- set_Block_block_visited(bl, get_irg_block_visited(current_ir_graph));
+ if (Block_not_block_visited(bl)) {
+ mark_Block_block_visited(bl);
- if(pre)
+ if (pre)
pre(bl, env);
- for(i = 0; i < get_Block_n_cfg_outs(bl); i++) {
+ for (i = 0, n = get_Block_n_cfg_outs(bl); i < n; i++) {
/* find the corresponding predecessor block. */
ir_node *pred = get_Block_cfg_out(bl, i);
/* recursion */
irg_out_block_walk2(pred, pre, post, env);
}
- if(post)
+ if (post)
post(bl, env);
}
- return;
}
/* Walks only over Block nodes in the graph. Has it's own visited
irg_walk_func *pre, irg_walk_func *post,
void *env) {
- assert((get_irn_op(node) == op_Block) || (intern_get_irn_mode(node) == mode_X));
+ assert(is_Block(node) || (get_irn_mode(node) == mode_X));
inc_irg_block_visited(current_ir_graph);
- if (intern_get_irn_mode(node) == mode_X) node = node->out[1];
+ if (get_irn_mode(node) == mode_X)
+ node = node->out[1];
irg_out_block_walk2(node, pre, post, env);
-
- return;
-
}
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
/** Building and Removing the out datasturcture **/
/** **/
/** The outs of a graph are allocated in a single, large array. **/
/** the large array into smaller parts, sets the out edges and **/
/** recounts the out edges. **/
/** Removes Tuple nodes! **/
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
-/* Returns the amount of out edges for not yet visited successors. */
-static int count_outs(ir_node *n) {
+/** Returns the amount of out edges for not yet visited successors. */
+static int _count_outs(ir_node *n) {
int start, i, res, irn_arity;
- ir_node *succ;
- set_irn_visited(n, get_irg_visited(current_ir_graph));
+ mark_irn_visited(n);
n->out = (ir_node **) 1; /* Space for array size. */
- if ((intern_get_irn_op(n) == op_Block)) start = 0; else start = -1;
- irn_arity = intern_get_irn_arity(n);
- res = irn_arity - start +1; /* --1 or --0; 1 for array size. */
- for (i = start; i < irn_arity; i++) {
+ start = is_Block(n) ? 0 : -1;
+ irn_arity = get_irn_arity(n);
+ res = irn_arity - start + 1; /* --1 or --0; 1 for array size. */
+
+ for (i = start; i < irn_arity; ++i) {
/* Optimize Tuples. They annoy if walking the cfg. */
- succ = skip_Tuple(intern_get_irn_n(n, i));
- set_irn_n(n, i, succ);
+ ir_node *pred = skip_Tuple(get_irn_n(n, i));
+ set_irn_n(n, i, pred);
+
/* count outs for successors */
- if (get_irn_visited(succ) < get_irg_visited(current_ir_graph)) {
- res += count_outs(succ);
- }
+ if (irn_not_visited(pred))
+ res += _count_outs(pred);
+
/* Count my outs */
- succ->out = (ir_node **)( (int)succ->out +1);
+ pred->out = (ir_node **)INT_TO_PTR(PTR_TO_INT(pred->out) + 1);
}
return res;
}
-static ir_node **set_out_edges(ir_node *n, ir_node **free) {
+
+/** Returns the amount of out edges for not yet visited successors.
+ * This version handles some special nodes like irg_frame, irg_args etc.
+ */
+static int count_outs(ir_graph *irg) {
+ ir_node *n;
+ int res;
+
+ inc_irg_visited(irg);
+ res = _count_outs(get_irg_end(irg));
+
+ /* now handle special nodes */
+ n = get_irg_frame(irg);
+ if (irn_not_visited(n)) {
+ n->out = (ir_node **)1;
+ ++res;
+ }
+
+ n = get_irg_args(irg);
+ if (irn_not_visited(n)) {
+ n->out = (ir_node **)1;
+ ++res;
+ }
+
+ return res;
+}
+
+/**
+ * Enter memory for the outs to a node.
+ *
+ * @param n current node
+ * @param free current free address in the chunk allocated for the outs
+ *
+ * @return The next free address
+ */
+static ir_node **_set_out_edges(ir_node *n, ir_node **free) {
int n_outs, start, i, irn_arity;
- ir_node *succ;
+ ir_node *pred;
set_irn_visited(n, get_irg_visited(current_ir_graph));
/* Allocate my array */
- n_outs = (int) n->out;
+ n_outs = PTR_TO_INT(n->out);
n->out = free;
#ifdef DEBUG_libfirm
n->out_valid = 1;
-#endif
- free = &free[n_outs];
+#endif /* defined DEBUG_libfirm */
+ free += n_outs;
/* We count the successors again, the space will be sufficient.
We use this counter to remember the position for the next back
edge. */
n->out[0] = (ir_node *)0;
- if (intern_get_irn_op(n) == op_Block) start = 0; else start = -1;
- irn_arity = intern_get_irn_arity(n);
+ start = is_Block(n) ? 0 : -1;
+ irn_arity = get_irn_arity(n);
+
for (i = start; i < irn_arity; i++) {
- succ = intern_get_irn_n(n, i);
+ pred = get_irn_n(n, i);
/* Recursion */
- if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
- free = set_out_edges(succ, free);
+ if (get_irn_visited(pred) < get_irg_visited(current_ir_graph))
+ free = _set_out_edges(pred, free);
/* Remember our back edge */
- succ->out[get_irn_n_outs(succ)+1] = n;
- succ->out[0] = (ir_node *) (get_irn_n_outs(succ) + 1);
+ pred->out[get_irn_n_outs(pred)+1] = n;
+ pred->out[0] = INT_TO_PTR(get_irn_n_outs(pred) + 1);
}
return free;
}
+/**
+ * Enter memory for the outs to a node. Handles special nodes
+ *
+ * @param irg the graph
+ * @param free current free address in the chunk allocated for the outs
+ *
+ * @return The next free address
+ */
+static ir_node **set_out_edges(ir_graph *irg, ir_node **free) {
+ ir_node *n, *special[2];
+ int i, n_outs;
+
+ inc_irg_visited(irg);
+ free = _set_out_edges(get_irg_end(irg), free);
+
+ /* handle special nodes */
+ special[0] = get_irg_frame(irg);
+ special[1] = get_irg_args(irg);
+
+ for (i = 1; i >= 0; --i) {
+ n = special[i];
+
+ if (get_irn_visited(n) < get_irg_visited(current_ir_graph)) {
+ n_outs = PTR_TO_INT(n->out);
+ n->out = free;
+#ifdef DEBUG_libfirm
+ n->out_valid = 1;
+#endif /* defined DEBUG_libfirm */
+ free += n_outs;
+ }
+ }
+
+ return free;
+}
+
+
+/* We want that the out of ProjX from Start contains the next block at
+ position 1, the Start block at position 2. This is necessary for
+ the out block walker. */
static INLINE void fix_start_proj(ir_graph *irg) {
- ir_node *proj = NULL, *startbl;
+ ir_node *proj = NULL;
+ ir_node *startbl = get_irg_start_block(irg);
int i;
- if (get_Block_n_cfg_outs(get_irg_start_block(irg))) {
- startbl = get_irg_start_block(irg);
- for (i = 0; i < get_irn_n_outs(startbl); i++)
- if (intern_get_irn_mode(get_irn_out(startbl, i)) == mode_X)
- proj = get_irn_out(startbl, i);
+
+ if (get_Block_n_cfg_outs(startbl)) {
+ for (i = get_irn_n_outs(startbl) - 1; i >= 0; --i)
+ if (get_irn_mode(get_irn_out(startbl, i)) == mode_X) {
+ proj = get_irn_out(startbl, i);
+ break;
+ }
+
if (get_irn_out(proj, 0) == startbl) {
assert(get_irn_n_outs(proj) == 2);
set_irn_out(proj, 0, get_irn_out(proj, 1));
}
}
-void compute_outs(ir_graph *irg) {
+/* compute the outs for a given graph */
+void compute_irg_outs(ir_graph *irg) {
ir_graph *rem = current_ir_graph;
int n_out_edges = 0;
- ir_node **end = NULL;
+ ir_node **end = NULL; /* Only for debugging */
current_ir_graph = irg;
/* Update graph state */
assert(get_irg_phase_state(current_ir_graph) != phase_building);
- if (current_ir_graph->outs_state != no_outs) free_outs(current_ir_graph);
- current_ir_graph->outs_state = outs_consistent;
+
+ if (current_ir_graph->outs_state != outs_none)
+ free_irg_outs(current_ir_graph);
/* This first iteration counts the overall number of out edges and the
number of out edges for each node. */
- inc_irg_visited(irg);
- n_out_edges = count_outs(get_irg_end(irg));
+ n_out_edges = count_outs(irg);
/* allocate memory for all out edges. */
- irg->outs = (ir_node **) xmalloc (n_out_edges * sizeof(ir_node *));
+ irg->outs = xcalloc(n_out_edges, sizeof(irg->outs[0]));
+#ifdef DEBUG_libfirm
irg->n_outs = n_out_edges;
+#endif /* defined DEBUG_libfirm */
/* The second iteration splits the irg->outs array into smaller arrays
for each node and writes the back edges into this array. */
- inc_irg_visited(irg);
- end = set_out_edges(get_irg_end(irg), irg->outs);
+ end = set_out_edges(irg, irg->outs);
/* Check how much memory we have used */
assert (end == (irg->outs + n_out_edges));
the out block walker. */
fix_start_proj(irg);
+ current_ir_graph->outs_state = outs_consistent;
current_ir_graph = rem;
}
+void assure_irg_outs(ir_graph *irg) {
+ if (get_irg_outs_state(irg) != outs_consistent)
+ compute_irg_outs(irg);
+}
+void compute_irp_outs(void) {
+ int i, n_irgs = get_irp_n_irgs();
+ for (i = 0; i < n_irgs; ++i)
+ compute_irg_outs(get_irp_irg(i));
+}
+void free_irp_outs(void) {
+ int i, n_irgs = get_irp_n_irgs();
+ for (i = 0; i < n_irgs; ++i)
+ free_irg_outs(get_irp_irg(i));
+}
/*------------------------------------------------------------*
*------------------------------------------------------------*/
-/* ------------------------------------------
- Inits the number of outedges for each node
- before counting.
- ------------------------------------------ */
-
-static void init_count(ir_node * node, void * env)
-{
+/**
+ * Inits the number of outedges for each node
+ * before counting.
+ */
+static void init_count(ir_node * node, void *env) {
node->out = (ir_node **) 1; /* 1 for the array size */
}
-/* -----------------------------------------------
- Adjusts the out edge count for its predecessors
- and adds the current arity to the overall count,
- which is saved in "env"
- ------------------------------------------------ */
-
+/**
+ * Adjusts the out edge count for its predecessors
+ * and adds the current arity to the overall count,
+ * which is saved in "env"
+ */
static void node_arity_count(ir_node * node, void * env)
{
- int *anz = (int *) env, arity, i, start;
+ int *anz = (int *) env, arity, n_outs, i, start;
ir_node *succ;
- arity = 1 + intern_get_irn_arity(node)
- + ((is_Block(node)) ? 0 : 1);
- *anz += arity;
-
+ arity = get_irn_arity(node);
start = (is_Block(node)) ? 0 : -1;
- for(i = start; i < intern_get_irn_arity(node); i++) {
- succ = intern_get_irn_n(node, i);
- succ->out = (ir_node **)((int)succ->out + 1);
+
+ n_outs = 1 + arity + (-start); // ((is_Block(node)) ? 0 : 1); // Why + 1??
+ *anz += n_outs;
+
+ for(i = start; i < arity; i++) {
+ succ = get_irn_n(node, i);
+ succ->out = (ir_node **)INT_TO_PTR(PTR_TO_INT(succ->out) + 1);
}
}
-/* ----------------------------------------
- Inits all nodes for setting the outedges
- Returns the overall count of edges
- ---------------------------------------- */
-
+/*
+ * Inits all nodes for setting the outedges
+ * Returns the overall count of edges
+ */
int count_ip_outs(void) {
int res = 0;
return(res);
}
-int dummy_count = 0, global_count; /* Only for debugging */
-
-/* ---------------------------------------------
- For each node: Sets the pointer to array
- in which the outedges are written later.
- The current array start is transported in env
- --------------------------------------------- */
+static int dummy_count = 0, global_count; /* Only for debugging */
+/**
+ * For each node: Sets the pointer to array
+ * in which the outedges are written later.
+ * The current array start is transported in env
+ */
static void set_array_pointer(ir_node *node, void *env) {
int n_outs;
ir_node ***free = (ir_node ***) env;
/* Allocate my array */
- n_outs = (int) node -> out; /* We wrote the count here in count_ip_outs */
+ n_outs = PTR_TO_INT(node->out); /* We wrote the count here in count_ip_outs */
dummy_count += n_outs;
assert(dummy_count <= global_count && "More outedges than initially counted!");
node -> out = *free;
}
-/* -------------------------------------------
- Adds an outedge from the predecessor to the
- current node.
- ------------------------------------------- */
-
+/**
+ * Adds an outedge from the predecessor to the
+ * current node.
+ */
static void set_out_pointer(ir_node * node, void * env) {
- int i;
+ int i, arity = get_irn_arity(node);
ir_node *succ;
int start = (!is_Block(node)) ? -1 : 0;
- for(i = start; i < intern_get_irn_arity(node); i++)
- {
- succ = intern_get_irn_n(node, i);
- succ->out[get_irn_n_outs(succ)+1] = node;
- succ->out[0] = (ir_node *) (get_irn_n_outs(succ) + 1);
- }
+ for (i = start; i < arity; i++) {
+ succ = get_irn_n(node, i);
+ succ->out[get_irn_n_outs(succ)+1] = node;
+ succ->out[0] = INT_TO_PTR(get_irn_n_outs(succ) + 1);
+ }
}
-/* -------------------------------
- Sets the outedges for all nodes.
- -------------------------------- */
-
+/*
+ * Sets the outedges for all nodes.
+ */
void set_ip_outs(void)
{
ir_node **outedge_array = get_irp_ip_outedges();
-/* --------------------------------------------------------
- Counts the outedges, allocates memory to save the
- outedges and fills this outedge array in interprocedural
- view!
- -------------------------------------------------------- */
-
+/*
+ * Counts the outedges, allocates memory to save the
+ * outedges and fills this outedge array in interprocedural
+ * view!
+ */
void compute_ip_outs(void) {
int n_out_edges;
assert(get_irp_ip_view_state() == ip_view_valid &&
"Cannot construct outs for invalid ip view.");
- if (irp->outs_state != no_outs) free_ip_outs();
+ if (irp->outs_state != outs_none) {
+ free_ip_outs();
+ }
global_count = n_out_edges = count_ip_outs();
- out_edges = (ir_node **) malloc (n_out_edges * sizeof(ir_node *));
+ out_edges = xcalloc(n_out_edges, sizeof(out_edges[0]));
set_irp_ip_outedges(out_edges);
set_ip_outs();
}
void free_ip_outs(void)
{
ir_node **out_edges = get_irp_ip_outedges();
- if (out_edges != NULL)
- {
- free(out_edges);
- set_irp_ip_outedges(NULL);
- }
- irp->outs_state = no_outs;
+ if (out_edges != NULL) {
+ free(out_edges);
+ set_irp_ip_outedges(NULL);
+ }
+ irp->outs_state = outs_none;
}
-void free_outs(ir_graph *irg) {
+void free_irg_outs(ir_graph *irg) {
-/* current_ir_graph->outs_state = no_outs; */
- irg->outs_state = no_outs;
+ /* current_ir_graph->outs_state = outs_none; */
+ irg->outs_state = outs_none;
if (irg->outs) {
+#ifdef DEBUG_libfirm
memset(irg->outs, 0, irg->n_outs);
+#endif /* defined DEBUG_libfirm */
free(irg->outs);
irg->outs = NULL;
+#ifdef DEBUG_libfirm
irg->n_outs = 0;
+#endif /* defined DEBUG_libfirm */
}
- irg_walk (get_irg_end_block (irg), reset_outs, NULL, NULL);
+#ifdef DEBUG_libfirm
+ /* when debugging, *always* reset all nodes' outs! irg->outs might
+ have been lying to us */
+ irg_walk_graph (irg, reset_outs, NULL, NULL);
+#endif /* defined DEBUG_libfirm */
}
projects / libfirm / blobdiff