/* Control flow graph analysis code for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
/* This file contains various simple utilities to analyze the CFG. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "hard-reg-set.h"
#include "basic-block.h"
};
typedef struct depth_first_search_dsS *depth_first_search_ds;
-static void flow_dfs_compute_reverse_init
- PARAMS ((depth_first_search_ds));
-static void flow_dfs_compute_reverse_add_bb
- PARAMS ((depth_first_search_ds, basic_block));
-static basic_block flow_dfs_compute_reverse_execute
- PARAMS ((depth_first_search_ds));
-static void flow_dfs_compute_reverse_finish
- PARAMS ((depth_first_search_ds));
-static void remove_fake_successors PARAMS ((basic_block));
-static bool need_fake_edge_p PARAMS ((rtx));
-static bool flow_active_insn_p PARAMS ((rtx));
+static void flow_dfs_compute_reverse_init (depth_first_search_ds);
+static void flow_dfs_compute_reverse_add_bb (depth_first_search_ds,
+ basic_block);
+static basic_block flow_dfs_compute_reverse_execute (depth_first_search_ds);
+static void flow_dfs_compute_reverse_finish (depth_first_search_ds);
+static void remove_fake_successors (basic_block);
+static bool flow_active_insn_p (rtx);
\f
/* Like active_insn_p, except keep the return value clobber around
even after reload. */
static bool
-flow_active_insn_p (insn)
- rtx insn;
+flow_active_insn_p (rtx insn)
{
if (active_insn_p (insn))
return true;
- /* A clobber of the function return value exists for buggy
+ /* A clobber of the function return value exists for buggy
programs that fail to return a value. Its effect is to
keep the return value from being live across the entire
function. If we allow it to be skipped, we introduce the
its single destination. */
bool
-forwarder_block_p (bb)
- basic_block bb;
+forwarder_block_p (basic_block bb)
{
rtx insn;
|| !bb->succ || bb->succ->succ_next)
return false;
- for (insn = bb->head; insn != bb->end; insn = NEXT_INSN (insn))
+ for (insn = BB_HEAD (bb); insn != BB_END (bb); insn = NEXT_INSN (insn))
if (INSN_P (insn) && flow_active_insn_p (insn))
return false;
/* Return nonzero if we can reach target from src by falling through. */
bool
-can_fallthru (src, target)
- basic_block src, target;
+can_fallthru (basic_block src, basic_block target)
{
- rtx insn = src->end;
- rtx insn2 = target->head;
+ rtx insn = BB_END (src);
+ rtx insn2 = target == EXIT_BLOCK_PTR ? NULL : BB_HEAD (target);
if (src->next_bb != target)
return 0;
- if (!active_insn_p (insn2))
+ if (insn2 && !active_insn_p (insn2))
insn2 = next_active_insn (insn2);
/* ??? Later we may add code to move jump tables offline. */
and heavily borrowed from flow_depth_first_order_compute. */
bool
-mark_dfs_back_edges ()
+mark_dfs_back_edges (void)
{
edge *stack;
int *pre;
bool found = false;
/* Allocate the preorder and postorder number arrays. */
- pre = (int *) xcalloc (last_basic_block, sizeof (int));
- post = (int *) xcalloc (last_basic_block, sizeof (int));
+ pre = xcalloc (last_basic_block, sizeof (int));
+ post = xcalloc (last_basic_block, sizeof (int));
/* Allocate stack for back-tracking up CFG. */
- stack = (edge *) xmalloc ((n_basic_blocks + 1) * sizeof (edge));
+ stack = xmalloc ((n_basic_blocks + 1) * sizeof (edge));
sp = 0;
/* Allocate bitmap to track nodes that have been visited. */
/* Set the flag EDGE_CAN_FALLTHRU for edges that can be fallthru. */
void
-set_edge_can_fallthru_flag ()
+set_edge_can_fallthru_flag (void)
{
basic_block bb;
{
edge e;
- /* The FALLTHRU edge is also CAN_FALLTHRU edge. */
for (e = bb->succ; e; e = e->succ_next)
- if (e->flags & EDGE_FALLTHRU)
- e->flags |= EDGE_CAN_FALLTHRU;
+ {
+ e->flags &= ~EDGE_CAN_FALLTHRU;
+
+ /* The FALLTHRU edge is also CAN_FALLTHRU edge. */
+ if (e->flags & EDGE_FALLTHRU)
+ e->flags |= EDGE_CAN_FALLTHRU;
+ }
- /* If the BB ends with an invertable condjump all (2) edges are
+ /* If the BB ends with an invertible condjump all (2) edges are
CAN_FALLTHRU edges. */
if (!bb->succ || !bb->succ->succ_next || bb->succ->succ_next->succ_next)
continue;
- if (!any_condjump_p (bb->end))
+ if (!any_condjump_p (BB_END (bb)))
continue;
- if (!invert_jump (bb->end, JUMP_LABEL (bb->end), 0))
+ if (!invert_jump (BB_END (bb), JUMP_LABEL (BB_END (bb)), 0))
continue;
- invert_jump (bb->end, JUMP_LABEL (bb->end), 0);
+ invert_jump (BB_END (bb), JUMP_LABEL (BB_END (bb)), 0);
bb->succ->flags |= EDGE_CAN_FALLTHRU;
bb->succ->succ_next->flags |= EDGE_CAN_FALLTHRU;
}
}
-/* Return true if we need to add fake edge to exit.
- Helper function for the flow_call_edges_add. */
-
-static bool
-need_fake_edge_p (insn)
- rtx insn;
-{
- if (!INSN_P (insn))
- return false;
-
- if ((GET_CODE (insn) == CALL_INSN
- && !SIBLING_CALL_P (insn)
- && !find_reg_note (insn, REG_NORETURN, NULL)
- && !find_reg_note (insn, REG_ALWAYS_RETURN, NULL)
- && !CONST_OR_PURE_CALL_P (insn)))
- return true;
-
- return ((GET_CODE (PATTERN (insn)) == ASM_OPERANDS
- && MEM_VOLATILE_P (PATTERN (insn)))
- || (GET_CODE (PATTERN (insn)) == PARALLEL
- && asm_noperands (insn) != -1
- && MEM_VOLATILE_P (XVECEXP (PATTERN (insn), 0, 0)))
- || GET_CODE (PATTERN (insn)) == ASM_INPUT);
-}
-
-/* Add fake edges to the function exit for any non constant and non noreturn
- calls, volatile inline assembly in the bitmap of blocks specified by
- BLOCKS or to the whole CFG if BLOCKS is zero. Return the number of blocks
- that were split.
-
- The goal is to expose cases in which entering a basic block does not imply
- that all subsequent instructions must be executed. */
-
-int
-flow_call_edges_add (blocks)
- sbitmap blocks;
-{
- int i;
- int blocks_split = 0;
- int last_bb = last_basic_block;
- bool check_last_block = false;
-
- if (n_basic_blocks == 0)
- return 0;
-
- if (! blocks)
- check_last_block = true;
- else
- check_last_block = TEST_BIT (blocks, EXIT_BLOCK_PTR->prev_bb->index);
-
- /* In the last basic block, before epilogue generation, there will be
- a fallthru edge to EXIT. Special care is required if the last insn
- of the last basic block is a call because make_edge folds duplicate
- edges, which would result in the fallthru edge also being marked
- fake, which would result in the fallthru edge being removed by
- remove_fake_edges, which would result in an invalid CFG.
-
- Moreover, we can't elide the outgoing fake edge, since the block
- profiler needs to take this into account in order to solve the minimal
- spanning tree in the case that the call doesn't return.
-
- Handle this by adding a dummy instruction in a new last basic block. */
- if (check_last_block)
- {
- basic_block bb = EXIT_BLOCK_PTR->prev_bb;
- rtx insn = bb->end;
-
- /* Back up past insns that must be kept in the same block as a call. */
- while (insn != bb->head
- && keep_with_call_p (insn))
- insn = PREV_INSN (insn);
-
- if (need_fake_edge_p (insn))
- {
- edge e;
-
- for (e = bb->succ; e; e = e->succ_next)
- if (e->dest == EXIT_BLOCK_PTR)
- break;
-
- insert_insn_on_edge (gen_rtx_USE (VOIDmode, const0_rtx), e);
- commit_edge_insertions ();
- }
- }
-
- /* Now add fake edges to the function exit for any non constant
- calls since there is no way that we can determine if they will
- return or not... */
-
- for (i = 0; i < last_bb; i++)
- {
- basic_block bb = BASIC_BLOCK (i);
- rtx insn;
- rtx prev_insn;
-
- if (!bb)
- continue;
-
- if (blocks && !TEST_BIT (blocks, i))
- continue;
-
- for (insn = bb->end; ; insn = prev_insn)
- {
- prev_insn = PREV_INSN (insn);
- if (need_fake_edge_p (insn))
- {
- edge e;
- rtx split_at_insn = insn;
-
- /* Don't split the block between a call and an insn that should
- remain in the same block as the call. */
- if (GET_CODE (insn) == CALL_INSN)
- while (split_at_insn != bb->end
- && keep_with_call_p (NEXT_INSN (split_at_insn)))
- split_at_insn = NEXT_INSN (split_at_insn);
-
- /* The handling above of the final block before the epilogue
- should be enough to verify that there is no edge to the exit
- block in CFG already. Calling make_edge in such case would
- cause us to mark that edge as fake and remove it later. */
-
-#ifdef ENABLE_CHECKING
- if (split_at_insn == bb->end)
- for (e = bb->succ; e; e = e->succ_next)
- if (e->dest == EXIT_BLOCK_PTR)
- abort ();
-#endif
-
- /* Note that the following may create a new basic block
- and renumber the existing basic blocks. */
- if (split_at_insn != bb->end)
- {
- e = split_block (bb, split_at_insn);
- if (e)
- blocks_split++;
- }
-
- make_edge (bb, EXIT_BLOCK_PTR, EDGE_FAKE);
- }
-
- if (insn == bb->head)
- break;
- }
- }
-
- if (blocks_split)
- verify_flow_info ();
-
- return blocks_split;
-}
-
/* Find unreachable blocks. An unreachable block will have 0 in
the reachable bit in block->flags. A nonzero value indicates the
block is reachable. */
void
-find_unreachable_blocks ()
+find_unreachable_blocks (void)
{
edge e;
basic_block *tos, *worklist, bb;
- tos = worklist =
- (basic_block *) xmalloc (sizeof (basic_block) * n_basic_blocks);
+ tos = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
/* Clear all the reachability flags. */
and the data structure is filled in. */
struct edge_list *
-create_edge_list ()
+create_edge_list (void)
{
struct edge_list *elist;
edge e;
num_edges++;
}
- elist = (struct edge_list *) xmalloc (sizeof (struct edge_list));
+ elist = xmalloc (sizeof (struct edge_list));
elist->num_blocks = block_count;
elist->num_edges = num_edges;
- elist->index_to_edge = (edge *) xmalloc (sizeof (edge) * num_edges);
+ elist->index_to_edge = xmalloc (sizeof (edge) * num_edges);
num_edges = 0;
/* This function free's memory associated with an edge list. */
void
-free_edge_list (elist)
- struct edge_list *elist;
+free_edge_list (struct edge_list *elist)
{
if (elist)
{
/* This function provides debug output showing an edge list. */
void
-print_edge_list (f, elist)
- FILE *f;
- struct edge_list *elist;
+print_edge_list (FILE *f, struct edge_list *elist)
{
int x;
extra edges. */
void
-verify_edge_list (f, elist)
- FILE *f;
- struct edge_list *elist;
+verify_edge_list (FILE *f, struct edge_list *elist)
{
int pred, succ, index;
edge e;
}
}
+/* Given PRED and SUCC blocks, return the edge which connects the blocks.
+ If no such edge exists, return NULL. */
+
+edge
+find_edge (basic_block pred, basic_block succ)
+{
+ edge e;
+
+ for (e = pred->succ; e; e = e->succ_next)
+ if (e->dest == succ)
+ return e;
+
+ return NULL;
+}
+
/* This routine will determine what, if any, edge there is between
a specified predecessor and successor. */
int
-find_edge_index (edge_list, pred, succ)
- struct edge_list *edge_list;
- basic_block pred, succ;
+find_edge_index (struct edge_list *edge_list, basic_block pred, basic_block succ)
{
int x;
/* Dump the list of basic blocks in the bitmap NODES. */
void
-flow_nodes_print (str, nodes, file)
- const char *str;
- const sbitmap nodes;
- FILE *file;
+flow_nodes_print (const char *str, const sbitmap nodes, FILE *file)
{
int node;
/* Dump the list of edges in the array EDGE_LIST. */
void
-flow_edge_list_print (str, edge_list, num_edges, file)
- const char *str;
- const edge *edge_list;
- int num_edges;
- FILE *file;
+flow_edge_list_print (const char *str, const edge *edge_list, int num_edges, FILE *file)
{
int i;
list it is in. */
static void
-remove_fake_successors (bb)
- basic_block bb;
+remove_fake_successors (basic_block bb)
{
edge e;
fake predecessors. */
void
-remove_fake_edges ()
+remove_fake_edges (void)
{
basic_block bb;
edges to exist. */
void
-add_noreturn_fake_exit_edges ()
+add_noreturn_fake_exit_edges (void)
{
basic_block bb;
nodes not reachable from the exit block. */
void
-connect_infinite_loops_to_exit ()
+connect_infinite_loops_to_exit (void)
{
basic_block unvisited_block;
struct depth_first_search_dsS dfs_ds;
return;
}
\f
-/* Compute reverse top sort order */
+/* Compute reverse top sort order. */
void
-flow_reverse_top_sort_order_compute (rts_order)
- int *rts_order;
+flow_reverse_top_sort_order_compute (int *rts_order)
{
edge *stack;
int sp;
sbitmap visited;
/* Allocate stack for back-tracking up CFG. */
- stack = (edge *) xmalloc ((n_basic_blocks + 1) * sizeof (edge));
+ stack = xmalloc ((n_basic_blocks + 1) * sizeof (edge));
sp = 0;
/* Allocate bitmap to track nodes that have been visited. */
possible. */
int
-flow_depth_first_order_compute (dfs_order, rc_order)
- int *dfs_order;
- int *rc_order;
+flow_depth_first_order_compute (int *dfs_order, int *rc_order)
{
edge *stack;
int sp;
sbitmap visited;
/* Allocate stack for back-tracking up CFG. */
- stack = (edge *) xmalloc ((n_basic_blocks + 1) * sizeof (edge));
+ stack = xmalloc ((n_basic_blocks + 1) * sizeof (edge));
sp = 0;
/* Allocate bitmap to track nodes that have been visited. */
2) Walking the resulting tree from right to left. */
void
-flow_preorder_transversal_compute (pot_order)
- int *pot_order;
+flow_preorder_transversal_compute (int *pot_order)
{
edge e;
edge *stack;
basic_block bb;
/* Allocate stack for back-tracking up CFG. */
- stack = (edge *) xmalloc ((n_basic_blocks + 1) * sizeof (edge));
+ stack = xmalloc ((n_basic_blocks + 1) * sizeof (edge));
sp = 0;
/* Allocate the tree. */
- dfst = (struct dfst_node *) xcalloc (last_basic_block,
- sizeof (struct dfst_node));
+ dfst = xcalloc (last_basic_block, sizeof (struct dfst_node));
FOR_EACH_BB (bb)
{
dfst[bb->index].node
= (max_successors
- ? (struct dfst_node **) xcalloc (max_successors,
- sizeof (struct dfst_node *))
- : NULL);
+ ? xcalloc (max_successors, sizeof (struct dfst_node *)) : NULL);
}
/* Allocate bitmap to track nodes that have been visited. */
element on the stack. */
static void
-flow_dfs_compute_reverse_init (data)
- depth_first_search_ds data;
+flow_dfs_compute_reverse_init (depth_first_search_ds data)
{
/* Allocate stack for back-tracking up CFG. */
- data->stack = (basic_block *) xmalloc ((n_basic_blocks - (INVALID_BLOCK + 1))
- * sizeof (basic_block));
+ data->stack = xmalloc ((n_basic_blocks - (INVALID_BLOCK + 1))
+ * sizeof (basic_block));
data->sp = 0;
/* Allocate bitmap to track nodes that have been visited. */
block. */
static void
-flow_dfs_compute_reverse_add_bb (data, bb)
- depth_first_search_ds data;
- basic_block bb;
+flow_dfs_compute_reverse_add_bb (depth_first_search_ds data, basic_block bb)
{
data->stack[data->sp++] = bb;
SET_BIT (data->visited_blocks, bb->index - (INVALID_BLOCK + 1));
available. */
static basic_block
-flow_dfs_compute_reverse_execute (data)
- depth_first_search_ds data;
+flow_dfs_compute_reverse_execute (depth_first_search_ds data)
{
basic_block bb;
edge e;
reverse graph. */
static void
-flow_dfs_compute_reverse_finish (data)
- depth_first_search_ds data;
+flow_dfs_compute_reverse_finish (depth_first_search_ds data)
{
free (data->stack);
sbitmap_free (data->visited_blocks);
if REVERSE, go against direction of edges. Returns number of blocks
found and their list in RSLT. RSLT can contain at most RSLT_MAX items. */
int
-dfs_enumerate_from (bb, reverse, predicate, rslt, rslt_max, data)
- basic_block bb;
- int reverse;
- bool (*predicate) (basic_block, void *);
- basic_block *rslt;
- int rslt_max;
- void *data;
+dfs_enumerate_from (basic_block bb, int reverse,
+ bool (*predicate) (basic_block, void *),
+ basic_block *rslt, int rslt_max, void *data)
{
basic_block *st, lbb;
int sp = 0, tv = 0;
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