/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* @date 7.2002
* @version $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
-#ifdef HAVE_STRING_H
#include <string.h>
-#endif
#include "irloop_t.h"
#include "irnode_t.h"
/** Counter to generate depth first numbering of visited nodes. */
static int current_dfn = 1;
-static int max_loop_depth = 0;
+static unsigned max_loop_depth = 0;
void link_to_reg_end(ir_node *n, void *env);
} scc_info;
/** Allocate a new scc_info on the given obstack */
-static INLINE scc_info *new_scc_info(struct obstack *obst) {
- scc_info *info = obstack_alloc(obst, sizeof(*info));
- memset(info, 0, sizeof(*info));
- return info;
+static inline scc_info *new_scc_info(struct obstack *obst)
+{
+ return OALLOCZ(obst, scc_info);
}
/**
* Marks the node n to be on the stack.
*/
-static INLINE void mark_irn_in_stack(ir_node *n) {
- scc_info *info = get_irn_link(n);
+static inline void mark_irn_in_stack(ir_node *n)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
info->in_stack = 1;
}
/**
* Marks the node n to be not on the stack.
*/
-static INLINE void mark_irn_not_in_stack(ir_node *n) {
- scc_info *info = get_irn_link(n);
+static inline void mark_irn_not_in_stack(ir_node *n)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
info->in_stack = 0;
}
/**
* Returns whether node n is on the stack.
*/
-static INLINE int irn_is_in_stack(ir_node *n) {
- scc_info *info = get_irn_link(n);
+static inline int irn_is_in_stack(ir_node *n)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
return info->in_stack;
}
/**
* Sets node n uplink value.
*/
-static INLINE void set_irn_uplink(ir_node *n, int uplink) {
- scc_info *info = get_irn_link(n);
+static inline void set_irn_uplink(ir_node *n, int uplink)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
info->uplink = uplink;
}
/**
* Return node n uplink value.
*/
-static INLINE int get_irn_uplink(ir_node *n) {
- scc_info *info = get_irn_link(n);
+static inline int get_irn_uplink(ir_node *n)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
return info->uplink;
}
/**
* Sets node n dfn value.
*/
-static INLINE void set_irn_dfn(ir_node *n, int dfn) {
- scc_info *info = get_irn_link(n);
+static inline void set_irn_dfn(ir_node *n, int dfn)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
info->dfn = dfn;
}
/**
* Returns node n dfn value.
*/
-static INLINE int get_irn_dfn(ir_node *n) {
- scc_info *info = get_irn_link(n);
+static inline int get_irn_dfn(ir_node *n)
+{
+ scc_info *info = (scc_info*) get_irn_link(n);
return info->dfn;
}
/** An IR-node stack */
static ir_node **stack = NULL;
/** The top (index) of the IR-node stack */
-static int tos = 0;
+static size_t tos = 0;
/**
* Initializes the IR-node stack
*/
-static INLINE void init_stack(void) {
+static inline void init_stack(void)
+{
if (stack) {
ARR_RESIZE(ir_node *, stack, 1000);
} else {
tos = 0;
}
+static void finish_stack(void)
+{
+ DEL_ARR_F(stack);
+ stack = NULL;
+}
+
/**
* Push a node n onto the IR-node stack.
*/
-static INLINE void push(ir_node *n) {
+static inline void push(ir_node *n)
+{
if (tos == ARR_LEN(stack)) {
- int nlen = ARR_LEN(stack) * 2;
+ size_t nlen = ARR_LEN(stack) * 2;
ARR_RESIZE(ir_node *, stack, nlen);
}
stack[tos++] = n;
/**
* Pop a node from the IR-node stack and return it.
*/
-static INLINE ir_node *pop(void) {
+static inline ir_node *pop(void)
+{
ir_node *n = stack[--tos];
mark_irn_not_in_stack(n);
return n;
* The nodes from tos up to n belong to the current loop.
* Removes them from the stack and adds them to the current loop.
*/
-static INLINE void pop_scc_to_loop(ir_node *n) {
+static inline void pop_scc_to_loop(ir_node *n)
+{
ir_node *m;
do {
/* GL ??? my last son is my grandson??? Removes cfloops with no
ir_nodes in them. Such loops have only another loop as son. (Why
can't they have two loops as sons? Does it never get that far? ) */
-static void close_loop(ir_loop *l) {
- int last = get_loop_n_elements(l) - 1;
+static void close_loop(ir_loop *l)
+{
+ size_t last = get_loop_n_elements(l) - 1;
loop_element lelement = get_loop_element(l, last);
ir_loop *last_son = lelement.son;
* Removes and unmarks all nodes up to n from the stack.
* The nodes must be visited once more to assign them to a scc.
*/
-static INLINE void pop_scc_unmark_visit(ir_node *n) {
+static inline void pop_scc_unmark_visit(ir_node *n)
+{
ir_node *m;
do {
* to the new loop and returns its father.
* The loop is allocated on the outermost_ir_graphs's obstack.
*/
-static ir_loop *new_loop(void) {
+static ir_loop *new_loop(void)
+{
ir_loop *father = current_loop;
ir_loop *son = alloc_loop(father, outermost_ir_graph->obst);
* Clear the backedges for all nodes.
* Called from a walker.
*/
-static INLINE void init_node(ir_node *n, void *env) {
- struct obstack *obst = env;
+static inline void init_node(ir_node *n, void *env)
+{
+ struct obstack *obst = (struct obstack*) env;
if (is_Block(n))
set_irn_link(n, new_scc_info(obst));
clear_backedges(n);
/**
* Initializes the common global settings for the scc algorithm
*/
-static INLINE void init_scc_common(void) {
+static inline void init_scc_common(void)
+{
current_dfn = 1;
loop_node_cnt = 0;
init_stack();
* Initializes the scc algorithm for the intraprocedural case.
* Add scc info to every block node.
*/
-static INLINE void init_scc(ir_graph *irg, struct obstack *obst) {
+static inline void init_scc(ir_graph *irg, struct obstack *obst)
+{
init_scc_common();
irg_walk_graph(irg, init_node, NULL, obst);
}
-#ifdef INTERPROCEDURAL_VIEW
-/**
- * Initializes the scc algorithm for the interprocedural case.
- */
-static INLINE void init_ip_scc(struct obstack *obst) {
- init_scc_common();
- cg_walk(init_node, NULL, obst);
-
-#if EXPERIMENTAL_CFLOOP_TREE
- cg_walk(link_to_reg_end, NULL, NULL);
-#endif
+static inline void finish_scc(void)
+{
+ finish_stack();
}
-#endif
/**
* Condition for breaking the recursion: n is the block
* that gets the initial control flow from the Start node.
*/
-static int is_outermost_StartBlock(ir_node *n) {
+static int is_outermost_StartBlock(ir_node *n)
+{
/* Test whether this is the outermost Start node. If so
recursion must end. */
assert(is_Block(n));
* @param n the block node to check
* @param root only needed for assertion.
*/
-static int is_head(ir_node *n, ir_node *root) {
+static int is_head(ir_node *n, ir_node *root)
+{
int i, arity;
int some_outof_loop = 0, some_in_loop = 0;
+ (void) root;
assert(is_Block(n));
if (!is_outermost_StartBlock(n)) {
- arity = get_irn_arity(n);
+ arity = get_Block_n_cfgpreds(n);
for (i = 0; i < arity; i++) {
- ir_node *pred = get_nodes_block(skip_Proj(get_irn_n(n, i)));
- if (is_backedge(n, i)) continue;
+ ir_node *pred = get_Block_cfgpred_block(n, i);
+ /* ignore Bad control flow: it cannot happen */
+ if (is_Bad(pred))
+ continue;
+ if (is_backedge(n, i))
+ continue;
if (!irn_is_in_stack(pred)) {
some_outof_loop = 1;
} else {
- if (get_irn_uplink(pred) < get_irn_uplink(root)) {
- assert(get_irn_uplink(pred) >= get_irn_uplink(root));
- }
+ assert(get_irn_uplink(pred) >= get_irn_uplink(root));
some_in_loop = 1;
}
}
/**
* Returns non-zero if n is possible loop head of an endless loop.
- * I.e., it is a Block, Phi or Filter node and has only predecessors
+ * I.e., it is a Block node and has only predecessors
* within the loop.
*
* @param n the block node to check
* @param root only needed for assertion.
*/
-static int is_endless_head(ir_node *n, ir_node *root) {
+static int is_endless_head(ir_node *n, ir_node *root)
+{
int i, arity;
- int some_outof_loop = 0, some_in_loop = 0;
+ int none_outof_loop = 1, some_in_loop = 0;
+ (void) root;
assert(is_Block(n));
/* Test for legal loop header: Block, Phi, ... */
if (!is_outermost_StartBlock(n)) {
- arity = get_irn_arity(n);
+ arity = get_Block_n_cfgpreds(n);
for (i = 0; i < arity; i++) {
- ir_node *pred = get_nodes_block(skip_Proj(get_irn_n(n, i)));
- assert(pred);
+ ir_node *pred = get_Block_cfgpred_block(n, i);
+ /* ignore Bad control flow: it cannot happen */
+ if (is_Bad(pred))
+ continue;
if (is_backedge(n, i))
continue;
if (!irn_is_in_stack(pred)) {
- some_outof_loop = 1; //printf(" some out of loop ");
+ none_outof_loop = 0;
} else {
- if (get_irn_uplink(pred) < get_irn_uplink(root)) {
- assert(get_irn_uplink(pred) >= get_irn_uplink(root));
- }
+ assert(get_irn_uplink(pred) >= get_irn_uplink(root));
some_in_loop = 1;
}
}
}
- return !some_outof_loop && some_in_loop;
+ return none_outof_loop && some_in_loop;
}
/**
* Returns index of the predecessor with the smallest dfn number
* greater-equal than limit.
*/
-static int smallest_dfn_pred(ir_node *n, int limit) {
+static int smallest_dfn_pred(ir_node *n, int limit)
+{
int i, index = -2, min = -1;
if (!is_outermost_StartBlock(n)) {
- int arity = get_irn_arity(n);
+ int arity = get_Block_n_cfgpreds(n);
for (i = 0; i < arity; i++) {
- ir_node *pred = get_nodes_block(skip_Proj(get_irn_n(n, i)));
+ ir_node *pred = get_Block_cfgpred_block(n, i);
+ /* ignore Bad control flow: it cannot happen */
+ if (is_Bad(pred))
+ continue;
if (is_backedge(n, i) || !irn_is_in_stack(pred))
continue;
if (get_irn_dfn(pred) >= limit && (min == -1 || get_irn_dfn(pred) < min)) {
/**
* Returns index of the predecessor with the largest dfn number.
*/
-static int largest_dfn_pred(ir_node *n) {
+static int largest_dfn_pred(ir_node *n)
+{
int i, index = -2, max = -1;
if (!is_outermost_StartBlock(n)) {
- int arity = get_irn_arity(n);
+ int arity = get_Block_n_cfgpreds(n);
for (i = 0; i < arity; i++) {
- ir_node *pred = get_nodes_block(skip_Proj(get_irn_n(n, i)));
+ ir_node *pred = get_Block_cfgpred_block(n, i);
+ /* ignore Bad control flow: it cannot happen */
+ if (is_Bad(pred))
+ continue;
if (is_backedge(n, i) || !irn_is_in_stack(pred))
continue;
if (get_irn_dfn(pred) > max) {
* returns the tail of the loop.
* If it finds no backedge returns NULL.
*/
-static ir_node *find_tail(ir_node *n) {
+static ir_node *find_tail(ir_node *n)
+{
ir_node *m;
- int i, res_index = -2;
+ int res_index = -2;
+ size_t i;
- m = stack[tos-1]; /* tos = top of stack */
+ m = stack[tos - 1]; /* tos = top of stack */
if (is_head(m, n)) {
res_index = smallest_dfn_pred(m, 0);
if ((res_index == -2) && /* no smallest dfn pred found. */
} else {
if (m == n)
return NULL;
- for (i = tos-2; i >= 0; --i) {
-
- m = stack[i];
+ for (i = tos - 1; i != 0;) {
+ m = stack[--i];
if (is_head(m, n)) {
res_index = smallest_dfn_pred(m, get_irn_dfn(m) + 1);
if (res_index == -2) /* no smallest dfn pred found. */
res_index = largest_dfn_pred(m);
if ((m == n) && (res_index == -2)) {
- i = -1;
+ i = (size_t)-1;
}
break;
}
/* We should not walk past our selves on the stack: The upcoming nodes
are not in this loop. We assume a loop not reachable from Start. */
if (m == n) {
- i = -1;
+ i = (size_t)-1;
break;
}
}
- if (i < 0) {
+ if (i == (size_t)-1) {
/* A dead loop not reachable from Start. */
- for (i = tos-2; i >= 0; --i) {
- m = stack[i];
- if (is_endless_head (m, n)) {
+ for (i = tos - 1; i != 0;) {
+ m = stack[--i];
+ if (is_endless_head(m, n)) {
res_index = smallest_dfn_pred (m, get_irn_dfn(m) + 1);
if (res_index == -2) /* no smallest dfn pred found. */
- res_index = largest_dfn_pred (m);
+ res_index = largest_dfn_pred(m);
break;
}
if (m == n) break; /* It's not an unreachable loop, either. */
assert(res_index > -2);
set_backedge(m, res_index);
- return is_outermost_StartBlock(n) ? NULL : get_nodes_block(skip_Proj(get_irn_n(m, res_index)));
+ return is_outermost_StartBlock(n) ? NULL : get_Block_cfgpred_block(m, res_index);
}
/**
* returns non.zero if l is the outermost loop.
*/
-INLINE static int is_outermost_loop(ir_loop *l) {
+inline static int is_outermost_loop(ir_loop *l)
+{
return l == get_loop_outer_loop(l);
}
/**
* Walks over all blocks of a graph
*/
-static void cfscc(ir_node *n) {
+static void cfscc(ir_node *n)
+{
int i;
assert(is_Block(n));
- if (irn_visited(n)) return;
- mark_irn_visited(n);
+ if (irn_visited_else_mark(n)) return;
/* Initialize the node */
set_irn_dfn(n, current_dfn); /* Depth first number for this node */
push(n);
if (!is_outermost_StartBlock(n)) {
- int arity = get_irn_arity(n);
+ int arity = get_Block_n_cfgpreds(n);
for (i = 0; i < arity; i++) {
ir_node *m;
if (is_backedge(n, i))
continue;
- m = get_nodes_block(skip_Proj(get_irn_n(n, i)));
+ m = get_Block_cfgpred_block(n, i);
+ /* ignore Bad control flow: it cannot happen */
+ if (is_Bad(m))
+ continue;
cfscc(m);
if (irn_is_in_stack(m)) {
#endif
/* Remove the cfloop from the stack ... */
- pop_scc_unmark_visit (n);
+ pop_scc_unmark_visit(n);
/* The current backedge has been marked, that is temporarily eliminated,
by find tail. Start the scc algorithm
}
/* Constructs control flow backedge information for irg. */
-int construct_cf_backedges(ir_graph *irg) {
+int construct_cf_backedges(ir_graph *irg)
+{
ir_graph *rem = current_ir_graph;
ir_loop *head_rem;
ir_node *end = get_irg_end(irg);
struct obstack temp;
int i;
- assert(!get_interprocedural_view() &&
- "use construct_ip_cf_backedges()");
max_loop_depth = 0;
current_ir_graph = irg;
if (is_Block(el))
cfscc(el);
}
+ finish_scc();
obstack_free(&temp, NULL);
assert(head_rem == current_loop);
return max_loop_depth;
}
-#ifdef INTERPROCEDURAL_VIEW
-int construct_ip_cf_backedges (void) {
- ir_graph *rem = current_ir_graph;
- int rem_ipv = get_interprocedural_view();
- struct obstack temp;
- int i;
-
- assert(get_irp_ip_view_state() == ip_view_valid);
- max_loop_depth = 0;
- outermost_ir_graph = get_irp_main_irg();
-
- obstack_init(&temp);
- init_ip_scc(&temp);
-
- current_loop = NULL;
- new_loop(); /* sets current_loop */
- set_interprocedural_view(1);
-
- inc_max_irg_visited();
- for (i = 0; i < get_irp_n_irgs(); i++)
- set_irg_visited(get_irp_irg(i), get_max_irg_visited());
+void assure_cf_loop(ir_graph *irg)
+{
+ irg_loopinfo_state state = get_irg_loopinfo_state(irg);
- /** We have to start the walk at the same nodes as cg_walk. **/
- /* Walk starting at unreachable procedures. Only these
- * have End blocks visible in interprocedural view. */
- for (i = 0; i < get_irp_n_irgs(); i++) {
- ir_node *sb;
- current_ir_graph = get_irp_irg(i);
-
- sb = get_irg_start_block(current_ir_graph);
-
- if ((get_Block_n_cfgpreds(sb) > 1) ||
- (get_nodes_block(get_Block_cfgpred(sb, 0)) != sb)) continue;
-
- cfscc(get_irg_end_block(current_ir_graph));
- }
-
- /* Check whether we walked all procedures: there could be procedures
- with cyclic calls but no call from the outside. */
- for (i = 0; i < get_irp_n_irgs(); i++) {
- ir_node *sb;
- current_ir_graph = get_irp_irg(i);
-
- /* Test start block: if inner procedure end and end block are not
- * visible and therefore not marked. */
- sb = get_irg_start_block(current_ir_graph);
- if (get_irn_visited(sb) < get_irg_visited(current_ir_graph)) cfscc(sb);
- }
-
- /* Walk all endless cfloops in inner procedures.
- * We recognize an inner procedure if the End node is not visited. */
- for (i = 0; i < get_irp_n_irgs(); i++) {
- ir_node *e;
- current_ir_graph = get_irp_irg(i);
-
- e = get_irg_end(current_ir_graph);
- if (get_irn_visited(e) < get_irg_visited(current_ir_graph)) {
- int j;
- /* Don't visit the End node. */
- for (j = 0; j < get_End_n_keepalives(e); j++) {
- ir_node *el = get_End_keepalive(e, j);
- if (is_Block(el)) cfscc(el);
- }
- }
- }
-
- set_irg_loop(outermost_ir_graph, current_loop);
- set_irg_loopinfo_state(current_ir_graph, loopinfo_cf_ip_consistent);
- assert(get_irg_loop(outermost_ir_graph)->kind == k_ir_loop);
-
- obstack_free(&temp, NULL);
- current_ir_graph = rem;
- set_interprocedural_view(rem_ipv);
- return max_loop_depth;
-}
-#endif
-
-/**
- * Clear the intra- and the interprocedural
- * backedge information pf a block.
- */
-static void reset_backedges(ir_node *block) {
- int rem;
-
- assert(is_Block(block));
-#ifdef INTERPROCEDURAL_VIEW
- rem = get_interprocedural_view();
- set_interprocedural_view(1);
- clear_backedges(block);
- set_interprocedural_view(0);
- clear_backedges(block);
- set_interprocedural_view(rem);
-#else
- (void) rem;
- clear_backedges(block);
-#endif
-}
-
-/**
- * Reset all backedges of the first block of
- * a loop as well as all loop info for all nodes of this loop.
- * Recurse into all nested loops.
- */
-static void loop_reset_backedges(ir_loop *l) {
- int i;
- reset_backedges(get_loop_node(l, 0));
- for (i = 0; i < get_loop_n_nodes(l); ++i)
- set_irn_loop(get_loop_node(l, i), NULL);
- for (i = 0; i < get_loop_n_sons(l); ++i) {
- loop_reset_backedges(get_loop_son(l, i));
- }
-}
-
-/* Removes all cfloop information.
- Resets all backedges */
-void free_cfloop_information(ir_graph *irg) {
- ir_loop *loop = get_irg_loop(irg);
- if (loop != NULL) {
- loop_reset_backedges(loop);
- set_irg_loop(irg, NULL);
- }
- set_irg_loopinfo_state(irg, loopinfo_none);
- /* We cannot free the cfloop nodes, they are on the obstack. */
-}
-
-
-void free_all_cfloop_information(void) {
- int i;
-#ifdef INTERPROCEDURAL_VIEW
- int rem = get_interprocedural_view();
- set_interprocedural_view(1); /* To visit all filter nodes */
-#endif
- for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- free_cfloop_information(get_irp_irg(i));
- }
-#ifdef INTERPROCEDURAL_VIEW
- set_interprocedural_view(rem);
-#endif
+ if (state != loopinfo_cf_consistent)
+ construct_cf_backedges(irg);
}
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