#include "toplev.h"
#include "except.h"
#include "cfgloop.h"
+#include "cfglayout.h"
/* This file contains functions for building the Control Flow Graph (CFG)
for a function tree. */
static void clear_blocks_annotations (void);
static void make_blocks (tree);
static void factor_computed_gotos (void);
-static tree tree_block_label (basic_block bb);
/* Edges. */
static void make_edges (void);
static void tree_make_forwarder_block (edge);
static bool thread_jumps (void);
static bool tree_forwarder_block_p (basic_block);
-static void bsi_commit_edge_inserts_1 (edge e);
static void tree_cfg2vcg (FILE *);
/* Flowgraph optimization and cleanup. */
static void tree_merge_blocks (basic_block, basic_block);
static bool tree_can_merge_blocks_p (basic_block, basic_block);
static void remove_bb (basic_block);
-static void group_case_labels (void);
-static void cleanup_dead_labels (void);
static bool cleanup_control_flow (void);
static bool cleanup_control_expr_graph (basic_block, block_stmt_iterator);
static edge find_taken_edge_cond_expr (basic_block, tree);
/* Initialize the basic block array. */
init_flow ();
+ profile_status = PROFILE_ABSENT;
n_basic_blocks = 0;
last_basic_block = 0;
VARRAY_BB_INIT (basic_block_info, initial_cfg_capacity, "basic_block_info");
if (found_computed_goto)
factor_computed_gotos ();
- /* Make sure there is always at least one block, even if its empty. */
+ /* Make sure there is always at least one block, even if it's empty. */
if (n_basic_blocks == 0)
create_empty_bb (ENTRY_BLOCK_PTR);
PROP_cfg, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_verify_stmts /* todo_flags_finish */
+ TODO_verify_stmts, /* todo_flags_finish */
+ 0 /* letter */
};
/* Search the CFG for any computed gotos. If found, factor them to a
create_block_annotation (basic_block bb)
{
/* Verify that the tree_annotations field is clear. */
- if (bb->tree_annotations)
- abort ();
+ gcc_assert (!bb->tree_annotations);
bb->tree_annotations = ggc_alloc_cleared (sizeof (struct bb_ann_d));
}
{
basic_block bb;
- if (e)
- abort ();
+ gcc_assert (!e);
- /* Create and initialize a new basic block. */
+ /* Create and initialize a new basic block. Since alloc_block uses
+ ggc_alloc_cleared to allocate a basic block, we do not have to
+ clear the newly allocated basic block here. */
bb = alloc_block ();
- memset (bb, 0, sizeof (*bb));
bb->index = last_basic_block;
bb->flags = BB_NEW;
make_edges (void)
{
basic_block bb;
- edge e;
/* Create an edge from entry to the first block with executable
statements in it. */
/* Finally, if no edges were created above, this is a regular
basic block that only needs a fallthru edge. */
- if (bb->succ == NULL)
+ if (EDGE_COUNT (bb->succs) == 0)
make_edge (bb, bb->next_bb, EDGE_FALLTHRU);
}
- /* If there is a fallthru edge to exit out of the last block, transform it
- to a return statement. */
- for (e = EXIT_BLOCK_PTR->prev_bb->succ; e; e = e->succ_next)
- if (e->flags & EDGE_FALLTHRU)
- break;
-
- if (e && e->dest == EXIT_BLOCK_PTR)
- {
- block_stmt_iterator bsi;
- basic_block ret_bb = EXIT_BLOCK_PTR->prev_bb;
- tree x;
-
- /* If E->SRC ends with a call that has an abnormal edge (for EH or
- nonlocal goto), then we will need to split the edge to insert
- an explicit return statement. */
- if (e != ret_bb->succ || e->succ_next)
- {
- ret_bb = split_edge (e);
- e = ret_bb->succ;
- }
- e->flags &= ~EDGE_FALLTHRU;
-
- x = build (RETURN_EXPR, void_type_node, NULL_TREE);
- bsi = bsi_last (ret_bb);
- bsi_insert_after (&bsi, x, BSI_NEW_STMT);
- }
-
/* We do not care about fake edges, so remove any that the CFG
builder inserted for completeness. */
- remove_fake_edges ();
+ remove_fake_exit_edges ();
/* Clean up the graph and warn for unreachable code. */
cleanup_tree_cfg ();
make_ctrl_stmt_edges (basic_block bb)
{
tree last = last_stmt (bb);
- tree first = first_stmt (bb);
-
-#if defined ENABLE_CHECKING
- if (last == NULL_TREE)
- abort();
-#endif
-
- if (TREE_CODE (first) == LABEL_EXPR
- && DECL_NONLOCAL (LABEL_EXPR_LABEL (first)))
- make_edge (ENTRY_BLOCK_PTR, bb, EDGE_ABNORMAL);
+ gcc_assert (last);
switch (TREE_CODE (last))
{
case GOTO_EXPR:
case RESX_EXPR:
make_eh_edges (last);
/* Yet another NORETURN hack. */
- if (bb->succ == NULL)
+ if (EDGE_COUNT (bb->succs) == 0)
make_edge (bb, EXIT_BLOCK_PTR, EDGE_FAKE);
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
static void
make_exit_edges (basic_block bb)
{
- tree last = last_stmt (bb);
-
- if (last == NULL_TREE)
- abort ();
+ tree last = last_stmt (bb), op;
+ gcc_assert (last);
switch (TREE_CODE (last))
{
case CALL_EXPR:
/* A MODIFY_EXPR may have a CALL_EXPR on its RHS and the CALL_EXPR
may have an abnormal edge. Search the RHS for this case and
create any required edges. */
- if (TREE_CODE (TREE_OPERAND (last, 1)) == CALL_EXPR
- && TREE_SIDE_EFFECTS (TREE_OPERAND (last, 1))
+ op = get_call_expr_in (last);
+ if (op && TREE_SIDE_EFFECTS (op)
&& current_function_has_nonlocal_label)
make_goto_expr_edges (bb);
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
basic_block then_bb, else_bb;
tree then_label, else_label;
-#if defined ENABLE_CHECKING
- if (entry == NULL_TREE || TREE_CODE (entry) != COND_EXPR)
- abort ();
-#endif
+ gcc_assert (entry);
+ gcc_assert (TREE_CODE (entry) == COND_EXPR);
/* Entry basic blocks for each component. */
then_label = GOTO_DESTINATION (COND_EXPR_THEN (entry));
basic_block
label_to_block (tree dest)
{
- return VARRAY_BB (label_to_block_map, LABEL_DECL_UID (dest));
+ int uid = LABEL_DECL_UID (dest);
+
+ /* We would die hard when faced by an undefined label. Emit a label to
+ the very first basic block. This will hopefully make even the dataflow
+ and undefined variable warnings quite right. */
+ if ((errorcount || sorrycount) && uid < 0)
+ {
+ block_stmt_iterator bsi = bsi_start (BASIC_BLOCK (0));
+ tree stmt;
+
+ stmt = build1 (LABEL_EXPR, void_type_node, dest);
+ bsi_insert_before (&bsi, stmt, BSI_NEW_STMT);
+ uid = LABEL_DECL_UID (dest);
+ }
+ return VARRAY_BB (label_to_block_map, uid);
}
/* A GOTO to a local label creates normal edges. */
if (simple_goto_p (goto_t))
{
- make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+ edge e = make_edge (bb, label_to_block (dest), EDGE_FALLTHRU);
+#ifdef USE_MAPPED_LOCATION
+ e->goto_locus = EXPR_LOCATION (goto_t);
+#else
+ e->goto_locus = EXPR_LOCUS (goto_t);
+#endif
bsi_remove (&last);
return;
}
}
/* Degenerate case of computed goto with no labels. */
- if (!for_call && !bb->succ)
+ if (!for_call && EDGE_COUNT (bb->succs) == 0)
make_edge (bb, EXIT_BLOCK_PTR, EDGE_FAKE);
}
/* Remove unreachable blocks and other miscellaneous clean up work. */
-void
+bool
cleanup_tree_cfg (void)
{
- bool something_changed = true;
+ bool retval = false;
timevar_push (TV_TREE_CLEANUP_CFG);
- /* These three transformations can cascade, so we iterate on them until
- nothing changes. */
- while (something_changed)
+ retval = cleanup_control_flow ();
+ retval |= delete_unreachable_blocks ();
+ retval |= thread_jumps ();
+
+#ifdef ENABLE_CHECKING
+ if (retval)
{
- something_changed = cleanup_control_flow ();
- something_changed |= thread_jumps ();
- something_changed |= delete_unreachable_blocks ();
+ gcc_assert (!cleanup_control_flow ());
+ gcc_assert (!delete_unreachable_blocks ());
+ gcc_assert (!thread_jumps ());
}
+#endif
/* Merging the blocks creates no new opportunities for the other
optimizations, so do it here. */
verify_flow_info ();
#endif
timevar_pop (TV_TREE_CLEANUP_CFG);
+ return retval;
}
tree old_label = get_eh_region_tree_label (region);
if (old_label)
{
- tree new_label = label_for_bb[label_to_block (old_label)->index];
+ tree new_label;
+ basic_block bb = label_to_block (old_label);
+
+ /* ??? After optimizing, there may be EH regions with labels
+ that have already been removed from the function body, so
+ there is no basic block for them. */
+ if (! bb)
+ return;
+
+ new_label = label_for_bb[bb->index];
set_eh_region_tree_label (region, new_label);
}
}
-/* Cleanup redundant labels. This is a three-steo process:
+/* Given LABEL return the first label in the same basic block. */
+static tree
+main_block_label (tree label)
+{
+ basic_block bb = label_to_block (label);
+
+ /* label_to_block possibly inserted undefined label into the chain. */
+ if (!label_for_bb[bb->index])
+ label_for_bb[bb->index] = label;
+ return label_for_bb[bb->index];
+}
+
+/* Cleanup redundant labels. This is a three-step process:
1) Find the leading label for each block.
2) Redirect all references to labels to the leading labels.
3) Cleanup all useless labels. */
-static void
+void
cleanup_dead_labels (void)
{
basic_block bb;
label_for_bb = xcalloc (last_basic_block, sizeof (tree));
/* Find a suitable label for each block. We use the first user-defined
- label is there is one, or otherwise just the first label we see. */
+ label if there is one, or otherwise just the first label we see. */
FOR_EACH_BB (bb)
{
block_stmt_iterator i;
case COND_EXPR:
{
tree true_branch, false_branch;
- basic_block true_bb, false_bb;
true_branch = COND_EXPR_THEN (stmt);
false_branch = COND_EXPR_ELSE (stmt);
- true_bb = label_to_block (GOTO_DESTINATION (true_branch));
- false_bb = label_to_block (GOTO_DESTINATION (false_branch));
- GOTO_DESTINATION (true_branch) = label_for_bb[true_bb->index];
- GOTO_DESTINATION (false_branch) = label_for_bb[false_bb->index];
+ GOTO_DESTINATION (true_branch)
+ = main_block_label (GOTO_DESTINATION (true_branch));
+ GOTO_DESTINATION (false_branch)
+ = main_block_label (GOTO_DESTINATION (false_branch));
break;
}
/* Replace all destination labels. */
for (i = 0; i < n; ++i)
- {
- tree label = CASE_LABEL (TREE_VEC_ELT (vec, i));
-
- CASE_LABEL (TREE_VEC_ELT (vec, i)) =
- label_for_bb[label_to_block (label)->index];
- }
+ CASE_LABEL (TREE_VEC_ELT (vec, i))
+ = main_block_label (CASE_LABEL (TREE_VEC_ELT (vec, i)));
break;
}
/* We have to handle GOTO_EXPRs until they're removed, and we don't
remove them until after we've created the CFG edges. */
case GOTO_EXPR:
- {
- tree label = GOTO_DESTINATION (stmt);
- if (! computed_goto_p (stmt))
- GOTO_DESTINATION (stmt) =
- label_for_bb[label_to_block (label)->index];
- break;
- }
+ if (! computed_goto_p (stmt))
+ {
+ GOTO_DESTINATION (stmt)
+ = main_block_label (GOTO_DESTINATION (stmt));
+ break;
+ }
default:
break;
same label.
Eg. three separate entries 1: 2: 3: become one entry 1..3: */
-static void
+void
group_case_labels (void)
{
basic_block bb;
tree labels = SWITCH_LABELS (stmt);
int old_size = TREE_VEC_LENGTH (labels);
int i, j, new_size = old_size;
+ tree default_case = TREE_VEC_ELT (labels, old_size - 1);
+ tree default_label;
+
+ /* The default label is always the last case in a switch
+ statement after gimplification. */
+ default_label = CASE_LABEL (default_case);
/* Look for possible opportunities to merge cases.
Ignore the last element of the label vector because it
must be the default case. */
i = 0;
- while (i < old_size - 2)
+ while (i < old_size - 1)
{
tree base_case, base_label, base_high, type;
base_case = TREE_VEC_ELT (labels, i);
- if (! base_case)
- abort ();
+ gcc_assert (base_case);
+ base_label = CASE_LABEL (base_case);
+
+ /* Discard cases that have the same destination as the
+ default case. */
+ if (base_label == default_label)
+ {
+ TREE_VEC_ELT (labels, i) = NULL_TREE;
+ i++;
+ new_size--;
+ continue;
+ }
type = TREE_TYPE (CASE_LOW (base_case));
- base_label = CASE_LABEL (base_case);
base_high = CASE_HIGH (base_case) ?
CASE_HIGH (base_case) : CASE_LOW (base_case);
-
+ i++;
/* Try to merge case labels. Break out when we reach the end
of the label vector or when we cannot merge the next case
label with the current one. */
- while (i < old_size - 2)
+ while (i < old_size - 1)
{
- tree merge_case = TREE_VEC_ELT (labels, ++i);
+ tree merge_case = TREE_VEC_ELT (labels, i);
tree merge_label = CASE_LABEL (merge_case);
tree t = int_const_binop (PLUS_EXPR, base_high,
integer_one_node, 1);
CASE_HIGH (base_case) = base_high;
TREE_VEC_ELT (labels, i) = NULL_TREE;
new_size--;
+ i++;
}
else
break;
tree stmt;
block_stmt_iterator bsi;
- if (!a->succ
- || a->succ->succ_next)
+ if (EDGE_COUNT (a->succs) != 1)
return false;
- if (a->succ->flags & EDGE_ABNORMAL)
+ if (EDGE_SUCC (a, 0)->flags & EDGE_ABNORMAL)
return false;
- if (a->succ->dest != b)
+ if (EDGE_SUCC (a, 0)->dest != b)
return false;
if (b == EXIT_BLOCK_PTR)
return false;
- if (b->pred->pred_next)
+ if (EDGE_COUNT (b->preds) > 1)
return false;
/* If A ends by a statement causing exceptions or something similar, we
/* Ensure that B follows A. */
move_block_after (b, a);
- if (!(a->succ->flags & EDGE_FALLTHRU))
- abort ();
-
- if (last_stmt (a)
- && stmt_ends_bb_p (last_stmt (a)))
- abort ();
+ gcc_assert (EDGE_SUCC (a, 0)->flags & EDGE_FALLTHRU);
+ gcc_assert (!last_stmt (a) || !stmt_ends_bb_p (last_stmt (a)));
/* Remove labels from B and set bb_for_stmt to A for other statements. */
for (bsi = bsi_start (b); !bsi_end_p (bsi);)
static bool
remove_useless_stmts_warn_notreached (tree stmt)
{
- if (EXPR_LOCUS (stmt))
+ if (EXPR_HAS_LOCATION (stmt))
{
- warning ("%Hwill never be executed", EXPR_LOCUS (stmt));
+ location_t loc = EXPR_LOCATION (stmt);
+ warning ("%Hwill never be executed", &loc);
return true;
}
else_has_label = data->has_label;
data->has_label = save_has_label | then_has_label | else_has_label;
- fold_stmt (stmt_p);
then_clause = COND_EXPR_THEN (*stmt_p);
else_clause = COND_EXPR_ELSE (*stmt_p);
cond = COND_EXPR_COND (*stmt_p);
static void
remove_useless_stmts_1 (tree *tp, struct rus_data *data)
{
- tree t = *tp;
+ tree t = *tp, op;
switch (TREE_CODE (t))
{
case MODIFY_EXPR:
data->last_goto = NULL;
fold_stmt (tp);
- if (TREE_CODE (TREE_OPERAND (t, 1)) == CALL_EXPR)
+ op = get_call_expr_in (t);
+ if (op)
{
- update_call_expr_flags (TREE_OPERAND (t, 1));
- notice_special_calls (TREE_OPERAND (t, 1));
+ update_call_expr_flags (op);
+ notice_special_calls (op);
}
if (tree_could_throw_p (t))
data->may_throw = true;
}
}
break;
- case SWITCH_EXPR:
+ case ASM_EXPR:
fold_stmt (tp);
data->last_goto = NULL;
break;
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- TODO_dump_func /* todo_flags_finish */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
};
/* Check whether we come here from a condition, and if so, get the
condition. */
- if (!bb->pred
- || bb->pred->pred_next
- || !(bb->pred->flags & (EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)))
+ if (EDGE_COUNT (bb->preds) != 1
+ || !(EDGE_PRED (bb, 0)->flags & (EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)))
return;
- cond = COND_EXPR_COND (last_stmt (bb->pred->src));
+ cond = COND_EXPR_COND (last_stmt (EDGE_PRED (bb, 0)->src));
if (TREE_CODE (cond) == VAR_DECL || TREE_CODE (cond) == PARM_DECL)
{
var = cond;
- val = (bb->pred->flags & EDGE_FALSE_VALUE
+ val = (EDGE_PRED (bb, 0)->flags & EDGE_FALSE_VALUE
? boolean_false_node : boolean_true_node);
}
else if (TREE_CODE (cond) == TRUTH_NOT_EXPR
|| TREE_CODE (TREE_OPERAND (cond, 0)) == PARM_DECL))
{
var = TREE_OPERAND (cond, 0);
- val = (bb->pred->flags & EDGE_FALSE_VALUE
+ val = (EDGE_PRED (bb, 0)->flags & EDGE_FALSE_VALUE
? boolean_true_node : boolean_false_node);
}
else
{
- if (bb->pred->flags & EDGE_FALSE_VALUE)
+ if (EDGE_PRED (bb, 0)->flags & EDGE_FALSE_VALUE)
cond = invert_truthvalue (cond);
if (TREE_CODE (cond) == EQ_EXPR
&& (TREE_CODE (TREE_OPERAND (cond, 0)) == VAR_DECL
continue;
}
- /* Invalidate the var if we encounter something that could modify it. */
+ /* Invalidate the var if we encounter something that could modify it.
+ Likewise for the value it was previously set to. Note that we only
+ consider values that are either a VAR_DECL or PARM_DECL so we
+ can test for conflict very simply. */
if (TREE_CODE (stmt) == ASM_EXPR
- || TREE_CODE (stmt) == VA_ARG_EXPR
|| (TREE_CODE (stmt) == MODIFY_EXPR
&& (TREE_OPERAND (stmt, 0) == var
- || TREE_OPERAND (stmt, 0) == val
- || TREE_CODE (TREE_OPERAND (stmt, 1)) == VA_ARG_EXPR)))
+ || TREE_OPERAND (stmt, 0) == val)))
return;
bsi_next (&bsi);
phi = phi_nodes (bb);
while (phi)
{
- tree next = TREE_CHAIN (phi);
+ tree next = PHI_CHAIN (phi);
remove_phi_node (phi, NULL_TREE, bb);
phi = next;
}
/* Remove edges to BB's successors. */
- while (bb->succ != NULL)
- ssa_remove_edge (bb->succ);
+ while (EDGE_COUNT (bb->succs) > 0)
+ ssa_remove_edge (EDGE_SUCC (bb, 0));
}
remove_bb (basic_block bb)
{
block_stmt_iterator i;
- location_t *loc = NULL;
+ source_locus loc = 0;
if (dump_file)
{
}
/* Remove all the instructions in the block. */
- for (i = bsi_start (bb); !bsi_end_p (i); bsi_remove (&i))
+ for (i = bsi_start (bb); !bsi_end_p (i);)
{
tree stmt = bsi_stmt (i);
+ if (TREE_CODE (stmt) == LABEL_EXPR
+ && FORCED_LABEL (LABEL_EXPR_LABEL (stmt)))
+ {
+ basic_block new_bb = bb->prev_bb;
+ block_stmt_iterator new_bsi = bsi_after_labels (new_bb);
+
+ bsi_remove (&i);
+ bsi_insert_after (&new_bsi, stmt, BSI_NEW_STMT);
+ }
+ else
+ {
+ release_defs (stmt);
- set_bb_for_stmt (stmt, NULL);
+ set_bb_for_stmt (stmt, NULL);
+ bsi_remove (&i);
+ }
/* Don't warn for removed gotos. Gotos are often removed due to
jump threading, thus resulting in bogus warnings. Not great,
since this way we lose warnings for gotos in the original
program that are indeed unreachable. */
- if (TREE_CODE (stmt) != GOTO_EXPR && EXPR_LOCUS (stmt) && !loc)
+ if (TREE_CODE (stmt) != GOTO_EXPR && EXPR_HAS_LOCATION (stmt) && !loc)
+#ifdef USE_MAPPED_LOCATION
+ loc = EXPR_LOCATION (stmt);
+#else
loc = EXPR_LOCUS (stmt);
+#endif
}
/* If requested, give a warning that the first statement in the
loop above, so the last statement we process is the first statement
in the block. */
if (warn_notreached && loc)
+#ifdef USE_MAPPED_LOCATION
+ warning ("%Hwill never be executed", &loc);
+#else
warning ("%Hwill never be executed", loc);
+#endif
remove_phi_nodes_and_edges_for_unreachable_block (bb);
}
-
-/* Examine BB to determine if it is a forwarding block (a block which only
- transfers control to a new destination). If BB is a forwarding block,
- then return the edge leading to the ultimate destination. */
-
-edge
-tree_block_forwards_to (basic_block bb)
-{
- block_stmt_iterator bsi;
- bb_ann_t ann = bb_ann (bb);
- tree stmt;
-
- /* If this block is not forwardable, then avoid useless work. */
- if (! ann->forwardable)
- return NULL;
-
- /* Set this block to not be forwardable. This prevents infinite loops since
- any block currently under examination is considered non-forwardable. */
- ann->forwardable = 0;
-
- /* No forwarding is possible if this block is a special block (ENTRY/EXIT),
- this block has more than one successor, this block's single successor is
- reached via an abnormal edge, this block has phi nodes, or this block's
- single successor has phi nodes. */
- if (bb == EXIT_BLOCK_PTR
- || bb == ENTRY_BLOCK_PTR
- || !bb->succ
- || bb->succ->succ_next
- || bb->succ->dest == EXIT_BLOCK_PTR
- || (bb->succ->flags & EDGE_ABNORMAL) != 0
- || phi_nodes (bb)
- || phi_nodes (bb->succ->dest))
- return NULL;
-
- /* Walk past any labels at the start of this block. */
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
- {
- stmt = bsi_stmt (bsi);
- if (TREE_CODE (stmt) != LABEL_EXPR)
- break;
- }
-
- /* If we reached the end of this block we may be able to optimize this
- case. */
- if (bsi_end_p (bsi))
- {
- edge dest;
-
- /* Recursive call to pick up chains of forwarding blocks. */
- dest = tree_block_forwards_to (bb->succ->dest);
-
- /* If none found, we forward to bb->succ at minimum. */
- if (!dest)
- dest = bb->succ;
-
- ann->forwardable = 1;
- return dest;
- }
-
- /* No forwarding possible. */
- return NULL;
-}
-
-
/* Try to remove superfluous control structures. */
static bool
bool retval = false;
tree expr = bsi_stmt (bsi), val;
- if (bb->succ->succ_next)
+ if (EDGE_COUNT (bb->succs) > 1)
{
- edge e, next;
+ edge e;
+ edge_iterator ei;
switch (TREE_CODE (expr))
{
break;
default:
- abort ();
+ gcc_unreachable ();
}
taken_edge = find_taken_edge (bb, val);
return false;
/* Remove all the edges except the one that is always executed. */
- for (e = bb->succ; e; e = next)
+ for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
{
- next = e->succ_next;
if (e != taken_edge)
{
taken_edge->probability += e->probability;
ssa_remove_edge (e);
retval = true;
}
+ else
+ ei_next (&ei);
}
if (taken_edge->probability > REG_BR_PROB_BASE)
taken_edge->probability = REG_BR_PROB_BASE;
}
else
- taken_edge = bb->succ;
+ taken_edge = EDGE_SUCC (bb, 0);
bsi_remove (&bsi);
taken_edge->flags = EDGE_FALLTHRU;
/* We removed some paths from the cfg. */
- if (dom_computed[CDI_DOMINATORS] >= DOM_CONS_OK)
- dom_computed[CDI_DOMINATORS] = DOM_CONS_OK;
+ free_dominance_info (CDI_DOMINATORS);
return retval;
}
-/* Given a control block BB and a constant value VAL, return the edge that
- will be taken out of the block. If VAL does not match a unique edge,
- NULL is returned. */
+/* Given a basic block BB ending with COND_EXPR or SWITCH_EXPR, and a
+ predicate VAL, return the edge that will be taken out of the block.
+ If VAL does not match a unique edge, NULL is returned. */
edge
find_taken_edge (basic_block bb, tree val)
stmt = last_stmt (bb);
-#if defined ENABLE_CHECKING
- if (stmt == NULL_TREE || !is_ctrl_stmt (stmt))
- abort ();
-#endif
+ gcc_assert (stmt);
+ gcc_assert (is_ctrl_stmt (stmt));
+ gcc_assert (val);
+
+ /* If VAL is a predicate of the form N RELOP N, where N is an
+ SSA_NAME, we can usually determine its truth value. */
+ if (COMPARISON_CLASS_P (val))
+ val = fold (val);
/* If VAL is not a constant, we can't determine which edge might
be taken. */
- if (val == NULL || !really_constant_p (val))
+ if (!really_constant_p (val))
return NULL;
if (TREE_CODE (stmt) == COND_EXPR)
if (TREE_CODE (stmt) == SWITCH_EXPR)
return find_taken_edge_switch_expr (bb, val);
- return bb->succ;
+ gcc_unreachable ();
}
extract_true_false_edges_from_block (bb, &true_edge, &false_edge);
- /* If both edges of the branch lead to the same basic block, it doesn't
- matter which edge is taken. */
- if (true_edge->dest == false_edge->dest)
- return true_edge;
-
/* Otherwise, try to determine which branch of the if() will be taken.
If VAL is a constant but it can't be reduced to a 0 or a 1, then
we don't really know which edge will be taken at runtime. This
dest_bb = label_to_block (CASE_LABEL (taken_case));
e = find_edge (bb, dest_bb);
- if (!e)
- abort ();
+ gcc_assert (e);
return e;
}
tree phi, val1, val2;
int n1, n2;
- for (phi = phi_nodes (dest); phi; phi = TREE_CHAIN (phi))
+ for (phi = phi_nodes (dest); phi; phi = PHI_CHAIN (phi))
{
n1 = phi_arg_from_edge (phi, e1);
n2 = phi_arg_from_edge (phi, e2);
-#ifdef ENABLE_CHECKING
- if (n1 < 0 || n2 < 0)
- abort ();
-#endif
+ gcc_assert (n1 >= 0);
+ gcc_assert (n2 >= 0);
val1 = PHI_ARG_DEF (phi, n1);
val2 = PHI_ARG_DEF (phi, n2);
}
-/* Computing the Dominance Frontier:
-
- As described in Morgan, section 3.5, this may be done simply by
- walking the dominator tree bottom-up, computing the frontier for
- the children before the parent. When considering a block B,
- there are two cases:
-
- (1) A flow graph edge leaving B that does not lead to a child
- of B in the dominator tree must be a block that is either equal
- to B or not dominated by B. Such blocks belong in the frontier
- of B.
-
- (2) Consider a block X in the frontier of one of the children C
- of B. If X is not equal to B and is not dominated by B, it
- is in the frontier of B. */
-
-static void
-compute_dominance_frontiers_1 (bitmap *frontiers, basic_block bb, sbitmap done)
-{
- edge e;
- basic_block c;
-
- SET_BIT (done, bb->index);
-
- /* Do the frontier of the children first. Not all children in the
- dominator tree (blocks dominated by this one) are children in the
- CFG, so check all blocks. */
- for (c = first_dom_son (CDI_DOMINATORS, bb);
- c;
- c = next_dom_son (CDI_DOMINATORS, c))
- {
- if (! TEST_BIT (done, c->index))
- compute_dominance_frontiers_1 (frontiers, c, done);
- }
-
- /* Find blocks conforming to rule (1) above. */
- for (e = bb->succ; e; e = e->succ_next)
- {
- if (e->dest == EXIT_BLOCK_PTR)
- continue;
- if (get_immediate_dominator (CDI_DOMINATORS, e->dest) != bb)
- bitmap_set_bit (frontiers[bb->index], e->dest->index);
- }
-
- /* Find blocks conforming to rule (2). */
- for (c = first_dom_son (CDI_DOMINATORS, bb);
- c;
- c = next_dom_son (CDI_DOMINATORS, c))
- {
- int x;
-
- EXECUTE_IF_SET_IN_BITMAP (frontiers[c->index], 0, x,
- {
- if (get_immediate_dominator (CDI_DOMINATORS, BASIC_BLOCK (x)) != bb)
- bitmap_set_bit (frontiers[bb->index], x);
- });
- }
-}
-
-
-void
-compute_dominance_frontiers (bitmap *frontiers)
-{
- sbitmap done = sbitmap_alloc (last_basic_block);
-
- timevar_push (TV_DOM_FRONTIERS);
-
- sbitmap_zero (done);
-
- compute_dominance_frontiers_1 (frontiers, ENTRY_BLOCK_PTR->succ->dest, done);
-
- sbitmap_free (done);
-
- timevar_pop (TV_DOM_FRONTIERS);
-}
-
-
-
/*---------------------------------------------------------------------------
Debugging functions
---------------------------------------------------------------------------*/
{
static long max_num_merged_labels = 0;
unsigned long size, total = 0;
- long n_edges;
+ int n_edges;
basic_block bb;
const char * const fmt_str = "%-30s%-13s%12s\n";
- const char * const fmt_str_1 = "%-30s%13lu%11lu%c\n";
+ const char * const fmt_str_1 = "%-30s%13d%11lu%c\n";
const char * const fmt_str_3 = "%-43s%11lu%c\n";
const char *funcname
= lang_hooks.decl_printable_name (current_function_decl, 2);
size = n_basic_blocks * sizeof (struct basic_block_def);
total += size;
- fprintf (file, fmt_str_1, "Basic blocks", n_basic_blocks, SCALE (size),
- LABEL (size));
+ fprintf (file, fmt_str_1, "Basic blocks", n_basic_blocks,
+ SCALE (size), LABEL (size));
n_edges = 0;
FOR_EACH_BB (bb)
- {
- edge e;
- for (e = bb->succ; e; e = e->succ_next)
- n_edges++;
- }
+ n_edges += EDGE_COUNT (bb->succs);
size = n_edges * sizeof (struct edge_def);
total += size;
fprintf (file, fmt_str_1, "Edges", n_edges, SCALE (size), LABEL (size));
tree_cfg2vcg (FILE *file)
{
edge e;
+ edge_iterator ei;
basic_block bb;
const char *funcname
= lang_hooks.decl_printable_name (current_function_decl, 2);
fprintf (file, "node: { title: \"EXIT\" label: \"EXIT\" }\n");
/* Write blocks and edges. */
- for (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
{
fprintf (file, "edge: { sourcename: \"ENTRY\" targetname: \"%d\"",
e->dest->index);
bb->index, bb->index, head_name, head_line, end_name,
end_line);
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
if (e->dest == EXIT_BLOCK_PTR)
fprintf (file, "edge: { sourcename: \"%d\" targetname: \"EXIT\"", bb->index);
bool
is_ctrl_altering_stmt (tree t)
{
- tree call = t;
+ tree call;
-#if defined ENABLE_CHECKING
- if (t == NULL)
- abort ();
-#endif
-
- switch (TREE_CODE (t))
+ gcc_assert (t);
+ call = get_call_expr_in (t);
+ if (call)
{
- case MODIFY_EXPR:
- /* A MODIFY_EXPR with a rhs of a call has the characteristics
- of the call. */
- call = TREE_OPERAND (t, 1);
- if (TREE_CODE (call) != CALL_EXPR)
- break;
- /* FALLTHRU */
-
- case CALL_EXPR:
/* A non-pure/const CALL_EXPR alters flow control if the current
function has nonlocal labels. */
- if (TREE_SIDE_EFFECTS (t)
- && current_function_has_nonlocal_label)
+ if (TREE_SIDE_EFFECTS (call) && current_function_has_nonlocal_label)
return true;
/* A CALL_EXPR also alters control flow if it does not return. */
if (call_expr_flags (call) & (ECF_NORETURN | ECF_LONGJMP))
return true;
- break;
-
- default:
- return false;
}
/* If a statement can throw, it alters control flow. */
bool
simple_goto_p (tree expr)
{
- return (TREE_CODE (expr) == GOTO_EXPR
- && TREE_CODE (GOTO_DESTINATION (expr)) == LABEL_DECL
- && (decl_function_context (GOTO_DESTINATION (expr))
- == current_function_decl));
+ return (TREE_CODE (expr) == GOTO_EXPR
+ && TREE_CODE (GOTO_DESTINATION (expr)) == LABEL_DECL);
}
basic_block bb;
block_stmt_iterator last;
edge e;
- tree stmt, label, forward;
+ edge_iterator ei;
+ tree stmt, label;
FOR_EACH_BB (bb)
{
from cfg_remove_useless_stmts here since it violates the
invariants for tree--cfg correspondence and thus fits better
here where we do it anyway. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
if (e->dest != bb->next_bb)
continue;
else if (e->flags & EDGE_FALSE_VALUE)
COND_EXPR_ELSE (stmt) = build_empty_stmt ();
else
- abort ();
+ gcc_unreachable ();
e->flags |= EDGE_FALLTHRU;
}
{
/* Remove the RETURN_EXPR if we may fall though to the exit
instead. */
- if (!bb->succ
- || bb->succ->succ_next
- || bb->succ->dest != EXIT_BLOCK_PTR)
- abort ();
+ gcc_assert (EDGE_COUNT (bb->succs) == 1);
+ gcc_assert (EDGE_SUCC (bb, 0)->dest == EXIT_BLOCK_PTR);
if (bb->next_bb == EXIT_BLOCK_PTR
&& !TREE_OPERAND (stmt, 0))
{
bsi_remove (&last);
- bb->succ->flags |= EDGE_FALLTHRU;
+ EDGE_SUCC (bb, 0)->flags |= EDGE_FALLTHRU;
}
continue;
}
continue;
/* Find a fallthru edge and emit the goto if necessary. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (e->flags & EDGE_FALLTHRU)
break;
- if (!e
- || e->dest == bb->next_bb)
+ if (!e || e->dest == bb->next_bb)
continue;
- if (e->dest == EXIT_BLOCK_PTR)
- abort ();
-
+ gcc_assert (e->dest != EXIT_BLOCK_PTR);
label = tree_block_label (e->dest);
- /* If this is a goto to a goto, jump to the final destination.
- Handles unfactoring of the computed jumps.
- ??? Why bother putting this back together when rtl is just
- about to take it apart again? */
- forward = last_and_only_stmt (e->dest);
- if (forward
- && TREE_CODE (forward) == GOTO_EXPR)
- label = GOTO_DESTINATION (forward);
-
- bsi_insert_after (&last,
- build1 (GOTO_EXPR, void_type_node, label),
- BSI_NEW_STMT);
+ stmt = build1 (GOTO_EXPR, void_type_node, label);
+#ifdef USE_MAPPED_LOCATION
+ SET_EXPR_LOCATION (stmt, e->goto_locus);
+#else
+ SET_EXPR_LOCUS (stmt, e->goto_locus);
+#endif
+ bsi_insert_after (&last, stmt, BSI_NEW_STMT);
e->flags &= ~EDGE_FALLTHRU;
}
}
-
-/* Remove all the blocks and edges that make up the flowgraph. */
+/* Remove block annotations and other datastructures. */
void
-delete_tree_cfg (void)
+delete_tree_cfg_annotations (void)
{
+ basic_block bb;
if (n_basic_blocks > 0)
free_blocks_annotations ();
- free_basic_block_vars ();
- basic_block_info = NULL;
label_to_block_map = NULL;
free_rbi_pool ();
+ FOR_EACH_BB (bb)
+ bb->rbi = NULL;
}
void
set_bb_for_stmt (tree t, basic_block bb)
{
- if (TREE_CODE (t) == STATEMENT_LIST)
+ if (TREE_CODE (t) == PHI_NODE)
+ PHI_BB (t) = bb;
+ else if (TREE_CODE (t) == STATEMENT_LIST)
{
tree_stmt_iterator i;
for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i))
VARRAY_GROW (label_to_block_map, 3 * uid / 2);
}
else
- {
-#ifdef ENABLE_CHECKING
- /* We're moving an existing label. Make sure that we've
- removed it from the old block. */
- if (bb && VARRAY_BB (label_to_block_map, uid))
- abort ();
-#endif
- }
+ /* We're moving an existing label. Make sure that we've
+ removed it from the old block. */
+ gcc_assert (!bb || !VARRAY_BB (label_to_block_map, uid));
VARRAY_BB (label_to_block_map, uid) = bb;
}
}
}
+/* Finds iterator for STMT. */
+
+extern block_stmt_iterator
+bsi_for_stmt (tree stmt)
+{
+ block_stmt_iterator bsi;
+
+ for (bsi = bsi_start (bb_for_stmt (stmt)); !bsi_end_p (bsi); bsi_next (&bsi))
+ if (bsi_stmt (bsi) == stmt)
+ return bsi;
+
+ gcc_unreachable ();
+}
/* Insert statement (or statement list) T before the statement
pointed-to by iterator I. M specifies how to update iterator I
bsi_insert_before (block_stmt_iterator *i, tree t, enum bsi_iterator_update m)
{
set_bb_for_stmt (t, i->bb);
- modify_stmt (t);
tsi_link_before (&i->tsi, t, m);
+ modify_stmt (t);
}
bsi_insert_after (block_stmt_iterator *i, tree t, enum bsi_iterator_update m)
{
set_bb_for_stmt (t, i->bb);
- modify_stmt (t);
tsi_link_after (&i->tsi, t, m);
+ modify_stmt (t);
}
{
tree t = bsi_stmt (*i);
set_bb_for_stmt (t, NULL);
- modify_stmt (t);
tsi_delink (&i->tsi);
}
In all cases, the returned *BSI points to the correct location. The
return value is true if insertion should be done after the location,
- or false if it should be done before the location. */
+ or false if it should be done before the location. If new basic block
+ has to be created, it is stored in *NEW_BB. */
static bool
-tree_find_edge_insert_loc (edge e, block_stmt_iterator *bsi)
+tree_find_edge_insert_loc (edge e, block_stmt_iterator *bsi,
+ basic_block *new_bb)
{
basic_block dest, src;
tree tmp;
would have to examine the PHIs to prove that none of them used
the value set by the statement we want to insert on E. That
hardly seems worth the effort. */
- if (dest->pred->pred_next == NULL
+ if (EDGE_COUNT (dest->preds) == 1
&& ! phi_nodes (dest)
&& dest != EXIT_BLOCK_PTR)
{
Except for the entry block. */
src = e->src;
if ((e->flags & EDGE_ABNORMAL) == 0
- && src->succ->succ_next == NULL
+ && EDGE_COUNT (src->succs) == 1
&& src != ENTRY_BLOCK_PTR)
{
*bsi = bsi_last (src);
tree op = TREE_OPERAND (tmp, 0);
if (!is_gimple_val (op))
{
- if (TREE_CODE (op) != MODIFY_EXPR)
- abort ();
+ gcc_assert (TREE_CODE (op) == MODIFY_EXPR);
bsi_insert_before (bsi, op, BSI_NEW_STMT);
TREE_OPERAND (tmp, 0) = TREE_OPERAND (op, 0);
}
/* Otherwise, create a new basic block, and split this edge. */
dest = split_edge (e);
- e = dest->pred;
+ if (new_bb)
+ *new_bb = dest;
+ e = EDGE_PRED (dest, 0);
goto restart;
}
basic_block bb;
edge e;
int blocks;
+ edge_iterator ei;
blocks = n_basic_blocks;
- bsi_commit_edge_inserts_1 (ENTRY_BLOCK_PTR->succ);
+ bsi_commit_one_edge_insert (EDGE_SUCC (ENTRY_BLOCK_PTR, 0), NULL);
FOR_EACH_BB (bb)
- for (e = bb->succ; e; e = e->succ_next)
- bsi_commit_edge_inserts_1 (e);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ bsi_commit_one_edge_insert (e, NULL);
if (new_blocks)
*new_blocks = n_basic_blocks - blocks;
}
-/* Commit insertions pending at edge E. */
+/* Commit insertions pending at edge E. If a new block is created, set NEW_BB
+ to this block, otherwise set it to NULL. */
-static void
-bsi_commit_edge_inserts_1 (edge e)
+void
+bsi_commit_one_edge_insert (edge e, basic_block *new_bb)
{
+ if (new_bb)
+ *new_bb = NULL;
if (PENDING_STMT (e))
{
block_stmt_iterator bsi;
PENDING_STMT (e) = NULL_TREE;
- if (tree_find_edge_insert_loc (e, &bsi))
+ if (tree_find_edge_insert_loc (e, &bsi, new_bb))
bsi_insert_after (&bsi, stmt, BSI_NEW_STMT);
else
bsi_insert_before (&bsi, stmt, BSI_NEW_STMT);
append_to_statement_list (stmt, &PENDING_STMT (e));
}
+/* Similar to bsi_insert_on_edge+bsi_commit_edge_inserts. If new block has to
+ be created, it is returned. */
-/* Specialized edge insertion for SSA-PRE. FIXME: This should
- probably disappear. The only reason it's here is because PRE needs
- the call to tree_find_edge_insert_loc(). */
-
-void pre_insert_on_edge (edge e, tree stmt);
-
-void
-pre_insert_on_edge (edge e, tree stmt)
+basic_block
+bsi_insert_on_edge_immediate (edge e, tree stmt)
{
block_stmt_iterator bsi;
+ basic_block new_bb = NULL;
- if (PENDING_STMT (e))
- abort ();
+ gcc_assert (!PENDING_STMT (e));
- if (tree_find_edge_insert_loc (e, &bsi))
+ if (tree_find_edge_insert_loc (e, &bsi, &new_bb))
bsi_insert_after (&bsi, stmt, BSI_NEW_STMT);
else
bsi_insert_before (&bsi, stmt, BSI_NEW_STMT);
-}
+ return new_bb;
+}
/*---------------------------------------------------------------------------
Tree specific functions for CFG manipulation
edge new_edge, e;
tree phi;
int i, num_elem;
+ edge_iterator ei;
/* Abnormal edges cannot be split. */
- if (edge_in->flags & EDGE_ABNORMAL)
- abort ();
+ gcc_assert (!(edge_in->flags & EDGE_ABNORMAL));
src = edge_in->src;
dest = edge_in->dest;
/* Place the new block in the block list. Try to keep the new block
near its "logical" location. This is of most help to humans looking
at debugging dumps. */
- for (e = dest->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, dest->preds)
if (e->src->next_bb == dest)
break;
if (!e)
after_bb = edge_in->src;
new_bb = create_empty_bb (after_bb);
+ new_bb->frequency = EDGE_FREQUENCY (edge_in);
+ new_bb->count = edge_in->count;
new_edge = make_edge (new_bb, dest, EDGE_FALLTHRU);
+ new_edge->probability = REG_BR_PROB_BASE;
+ new_edge->count = edge_in->count;
/* Find all the PHI arguments on the original edge, and change them to
the new edge. Do it before redirection, so that the argument does not
get removed. */
- for (phi = phi_nodes (dest); phi; phi = TREE_CHAIN (phi))
+ for (phi = phi_nodes (dest); phi; phi = PHI_CHAIN (phi))
{
num_elem = PHI_NUM_ARGS (phi);
for (i = 0; i < num_elem; i++)
}
}
- if (!redirect_edge_and_branch (edge_in, new_bb))
- abort ();
-
- if (PENDING_STMT (edge_in))
- abort ();
+ e = redirect_edge_and_branch (edge_in, new_bb);
+ gcc_assert (e);
+ gcc_assert (!PENDING_STMT (edge_in));
return new_bb;
}
properly noticed as such. */
static tree
-verify_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
- void *data ATTRIBUTE_UNUSED)
+verify_expr (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
{
tree t = *tp, x;
if (TYPE_P (t))
*walk_subtrees = 0;
+
+ /* Check operand N for being valid GIMPLE and give error MSG if not.
+ We check for constants explicitly since they are not considered
+ gimple invariants if they overflowed. */
+#define CHECK_OP(N, MSG) \
+ do { if (!CONSTANT_CLASS_P (TREE_OPERAND (t, N)) \
+ && !is_gimple_val (TREE_OPERAND (t, N))) \
+ { error (MSG); return TREE_OPERAND (t, N); }} while (0)
switch (TREE_CODE (t))
{
&& is_gimple_reg (TREE_OPERAND (x, 0)))
{
error ("GIMPLE register modified with BIT_FIELD_REF");
- return *tp;
+ return t;
}
break;
case ADDR_EXPR:
- x = TREE_OPERAND (t, 0);
- while (TREE_CODE (x) == ARRAY_REF
- || TREE_CODE (x) == COMPONENT_REF
- || TREE_CODE (x) == REALPART_EXPR
- || TREE_CODE (x) == IMAGPART_EXPR)
- x = TREE_OPERAND (x, 0);
+ /* Skip any references (they will be checked when we recurse down the
+ tree) and ensure that any variable used as a prefix is marked
+ addressable. */
+ for (x = TREE_OPERAND (t, 0);
+ (handled_component_p (x)
+ || TREE_CODE (x) == REALPART_EXPR
+ || TREE_CODE (x) == IMAGPART_EXPR);
+ x = TREE_OPERAND (x, 0))
+ ;
+
if (TREE_CODE (x) != VAR_DECL && TREE_CODE (x) != PARM_DECL)
return NULL;
if (!TREE_ADDRESSABLE (x))
case BIT_NOT_EXPR:
case NON_LVALUE_EXPR:
case TRUTH_NOT_EXPR:
- x = TREE_OPERAND (t, 0);
- /* We check for constants explicitly since they are not considered
- gimple invariants if they overflowed. */
- if (TREE_CODE_CLASS (TREE_CODE (x)) != 'c'
- && !is_gimple_val (x))
- {
- error ("Invalid operand to unary operator");
- return x;
- }
+ CHECK_OP (0, "Invalid operand to unary operator");
break;
case REALPART_EXPR:
case IMAGPART_EXPR:
+ case COMPONENT_REF:
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ case BIT_FIELD_REF:
+ case VIEW_CONVERT_EXPR:
+ /* We have a nest of references. Verify that each of the operands
+ that determine where to reference is either a constant or a variable,
+ verify that the base is valid, and then show we've already checked
+ the subtrees. */
+ while (TREE_CODE (t) == REALPART_EXPR || TREE_CODE (t) == IMAGPART_EXPR
+ || handled_component_p (t))
+ {
+ if (TREE_CODE (t) == COMPONENT_REF && TREE_OPERAND (t, 2))
+ CHECK_OP (2, "Invalid COMPONENT_REF offset operator");
+ else if (TREE_CODE (t) == ARRAY_REF
+ || TREE_CODE (t) == ARRAY_RANGE_REF)
+ {
+ CHECK_OP (1, "Invalid array index.");
+ if (TREE_OPERAND (t, 2))
+ CHECK_OP (2, "Invalid array lower bound.");
+ if (TREE_OPERAND (t, 3))
+ CHECK_OP (3, "Invalid array stride.");
+ }
+ else if (TREE_CODE (t) == BIT_FIELD_REF)
+ {
+ CHECK_OP (1, "Invalid operand to BIT_FIELD_REF");
+ CHECK_OP (2, "Invalid operand to BIT_FIELD_REF");
+ }
+
+ t = TREE_OPERAND (t, 0);
+ }
+
+ if (!CONSTANT_CLASS_P (t) && !is_gimple_lvalue (t))
+ {
+ error ("Invalid reference prefix.");
+ return t;
+ }
+ *walk_subtrees = 0;
break;
case LT_EXPR:
case BIT_IOR_EXPR:
case BIT_XOR_EXPR:
case BIT_AND_EXPR:
- x = TREE_OPERAND (t, 0);
- /* We check for constants explicitly since they are not considered
- gimple invariants if they overflowed. */
- if (TREE_CODE_CLASS (TREE_CODE (x)) != 'c'
- && !is_gimple_val (x))
- {
- error ("Invalid operand to binary operator");
- return x;
- }
- x = TREE_OPERAND (t, 1);
- /* We check for constants explicitly since they are not considered
- gimple invariants if they overflowed. */
- if (TREE_CODE_CLASS (TREE_CODE (x)) != 'c'
- && !is_gimple_val (x))
- {
- error ("Invalid operand to binary operator");
- return x;
- }
+ CHECK_OP (0, "Invalid operand to binary operator");
+ CHECK_OP (1, "Invalid operand to binary operator");
break;
default:
break;
}
return NULL;
+
+#undef CHECK_OP
}
TODO: Implement type checking. */
static bool
-verify_stmt (tree stmt)
+verify_stmt (tree stmt, bool last_in_block)
{
tree addr;
if (!is_gimple_stmt (stmt))
{
error ("Is not a valid GIMPLE statement.");
- debug_generic_stmt (stmt);
- return true;
+ goto fail;
}
addr = walk_tree (&stmt, verify_expr, NULL, NULL);
return true;
}
+ /* If the statement is marked as part of an EH region, then it is
+ expected that the statement could throw. Verify that when we
+ have optimizations that simplify statements such that we prove
+ that they cannot throw, that we update other data structures
+ to match. */
+ if (lookup_stmt_eh_region (stmt) >= 0)
+ {
+ if (!tree_could_throw_p (stmt))
+ {
+ error ("Statement marked for throw, but doesn%'t.");
+ goto fail;
+ }
+ if (!last_in_block && tree_can_throw_internal (stmt))
+ {
+ error ("Statement marked for throw in middle of block.");
+ goto fail;
+ }
+ }
+
return false;
+
+ fail:
+ debug_generic_stmt (stmt);
+ return true;
}
static bool
tree_node_can_be_shared (tree t)
{
- if (TYPE_P (t) || DECL_P (t)
+ if (IS_TYPE_OR_DECL_P (t)
/* We check for constants explicitly since they are not considered
gimple invariants if they overflowed. */
- || TREE_CODE_CLASS (TREE_CODE (t)) == 'c'
+ || CONSTANT_CLASS_P (t)
|| is_gimple_min_invariant (t)
|| TREE_CODE (t) == SSA_NAME)
return true;
- while ((TREE_CODE (t) == ARRAY_REF
+ while (((TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
/* We check for constants explicitly since they are not considered
gimple invariants if they overflowed. */
- && (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (t, 1))) == 'c'
+ && (CONSTANT_CLASS_P (TREE_OPERAND (t, 1))
|| is_gimple_min_invariant (TREE_OPERAND (t, 1))))
|| (TREE_CODE (t) == COMPONENT_REF
|| TREE_CODE (t) == REALPART_EXPR
tree phi;
int i;
- for (phi = phi_nodes (bb); phi; phi = TREE_CHAIN (phi))
+ for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
{
int phi_num_args = PHI_NUM_ARGS (phi);
}
}
- for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); )
{
tree stmt = bsi_stmt (bsi);
- err |= verify_stmt (stmt);
+ bsi_next (&bsi);
+ err |= verify_stmt (stmt, bsi_end_p (bsi));
addr = walk_tree (&stmt, verify_node_sharing, htab, NULL);
if (addr)
{
block_stmt_iterator bsi;
tree stmt;
edge e;
+ edge_iterator ei;
if (ENTRY_BLOCK_PTR->stmt_list)
{
err = 1;
}
- for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
if (e->flags & EDGE_FALLTHRU)
{
error ("Fallthru to exit from bb %d\n", e->src->index);
if (label_to_block (LABEL_EXPR_LABEL (bsi_stmt (bsi))) != bb)
{
+ tree stmt = bsi_stmt (bsi);
error ("Label %s to block does not match in bb %d\n",
- IDENTIFIER_POINTER (DECL_NAME (bsi_stmt (bsi))),
+ IDENTIFIER_POINTER (DECL_NAME (LABEL_EXPR_LABEL (stmt))),
bb->index);
err = 1;
}
if (decl_function_context (LABEL_EXPR_LABEL (bsi_stmt (bsi)))
!= current_function_decl)
{
+ tree stmt = bsi_stmt (bsi);
error ("Label %s has incorrect context in bb %d\n",
- IDENTIFIER_POINTER (DECL_NAME (bsi_stmt (bsi))),
+ IDENTIFIER_POINTER (DECL_NAME (LABEL_EXPR_LABEL (stmt))),
bb->index);
err = 1;
}
if (is_ctrl_stmt (stmt))
{
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (e->flags & EDGE_FALLTHRU)
{
error ("Fallthru edge after a control statement in bb %d \n",
|| !(false_edge->flags & EDGE_FALSE_VALUE)
|| (true_edge->flags & (EDGE_FALLTHRU | EDGE_ABNORMAL))
|| (false_edge->flags & (EDGE_FALLTHRU | EDGE_ABNORMAL))
- || bb->succ->succ_next->succ_next)
+ || EDGE_COUNT (bb->succs) >= 3)
{
error ("Wrong outgoing edge flags at end of bb %d\n",
bb->index);
if (!has_label_p (true_edge->dest,
GOTO_DESTINATION (COND_EXPR_THEN (stmt))))
{
- error ("`then' label does not match edge at end of bb %d\n",
+ error ("%<then%> label does not match edge at end of bb %d\n",
bb->index);
err = 1;
}
if (!has_label_p (false_edge->dest,
GOTO_DESTINATION (COND_EXPR_ELSE (stmt))))
{
- error ("`else' label does not match edge at end of bb %d\n",
+ error ("%<else%> label does not match edge at end of bb %d\n",
bb->index);
err = 1;
}
{
/* FIXME. We should double check that the labels in the
destination blocks have their address taken. */
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if ((e->flags & (EDGE_FALLTHRU | EDGE_TRUE_VALUE
| EDGE_FALSE_VALUE))
|| !(e->flags & EDGE_ABNORMAL))
break;
case RETURN_EXPR:
- if (!bb->succ || bb->succ->succ_next
- || (bb->succ->flags & (EDGE_FALLTHRU | EDGE_ABNORMAL
+ if (EDGE_COUNT (bb->succs) != 1
+ || (EDGE_SUCC (bb, 0)->flags & (EDGE_FALLTHRU | EDGE_ABNORMAL
| EDGE_TRUE_VALUE | EDGE_FALSE_VALUE)))
{
error ("Wrong outgoing edge flags at end of bb %d\n", bb->index);
err = 1;
}
- if (bb->succ->dest != EXIT_BLOCK_PTR)
+ if (EDGE_SUCC (bb, 0)->dest != EXIT_BLOCK_PTR)
{
error ("Return edge does not point to exit in bb %d\n",
bb->index);
tree lab = CASE_LABEL (TREE_VEC_ELT (vec, i));
basic_block label_bb = label_to_block (lab);
- if (label_bb->aux && label_bb->aux != (void *)1)
- abort ();
+ gcc_assert (!label_bb->aux || label_bb->aux == (void *)1);
label_bb->aux = (void *)1;
}
err = 1;
}
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
{
if (!e->dest->aux)
{
}
}
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
e->dest->aux = (void *)0;
}
}
-/* Updates phi nodes after creating forwarder block joined
+/* Updates phi nodes after creating a forwarder block joined
by edge FALLTHRU. */
static void
tree_make_forwarder_block (edge fallthru)
{
edge e;
+ edge_iterator ei;
basic_block dummy, bb;
tree phi, new_phi, var;
dummy = fallthru->src;
bb = fallthru->dest;
- if (!bb->pred->pred_next)
+ if (EDGE_COUNT (bb->preds) == 1)
return;
/* If we redirected a branch we must create new phi nodes at the
start of BB. */
- for (phi = phi_nodes (dummy); phi; phi = TREE_CHAIN (phi))
+ for (phi = phi_nodes (dummy); phi; phi = PHI_CHAIN (phi))
{
var = PHI_RESULT (phi);
new_phi = create_phi_node (var, bb);
SSA_NAME_DEF_STMT (var) = new_phi;
- PHI_RESULT (phi) = make_ssa_name (SSA_NAME_VAR (var), phi);
+ SET_PHI_RESULT (phi, make_ssa_name (SSA_NAME_VAR (var), phi));
add_phi_arg (&new_phi, PHI_RESULT (phi), fallthru);
}
- /* Ensure that the PHI node chains are in the same order. */
- set_phi_nodes (bb, nreverse (phi_nodes (bb)));
+ /* Ensure that the PHI node chain is in the same order. */
+ set_phi_nodes (bb, phi_reverse (phi_nodes (bb)));
/* Add the arguments we have stored on edges. */
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
{
if (e == fallthru)
continue;
- for (phi = phi_nodes (bb), var = PENDING_STMT (e);
- phi;
- phi = TREE_CHAIN (phi), var = TREE_CHAIN (var))
- add_phi_arg (&phi, TREE_VALUE (var), e);
-
- PENDING_STMT (e) = NULL;
+ flush_pending_stmts (e);
}
}
/* Return true if basic block BB does nothing except pass control
flow to another block and that we can safely insert a label at
- the start of the successor block. */
+ the start of the successor block.
+
+ As a precondition, we require that BB be not equal to
+ ENTRY_BLOCK_PTR. */
static bool
tree_forwarder_block_p (basic_block bb)
{
block_stmt_iterator bsi;
edge e;
+ edge_iterator ei;
- /* If we have already determined that this block is not forwardable,
- then no further checks are necessary. */
- if (! bb_ann (bb)->forwardable)
- return false;
-
- /* BB must have a single outgoing normal edge. Otherwise it can not be
- a forwarder block. */
- if (!bb->succ
- || bb->succ->succ_next
- || bb->succ->dest == EXIT_BLOCK_PTR
- || (bb->succ->flags & EDGE_ABNORMAL)
- || bb == ENTRY_BLOCK_PTR)
- {
- bb_ann (bb)->forwardable = 0;
- return false;
- }
+ /* BB must have a single outgoing edge. */
+ if (EDGE_COUNT (bb->succs) != 1
+ /* BB can not have any PHI nodes. This could potentially be
+ relaxed early in compilation if we re-rewrote the variables
+ appearing in any PHI nodes in forwarder blocks. */
+ || phi_nodes (bb)
+ /* BB may not be a predecessor of EXIT_BLOCK_PTR. */
+ || EDGE_SUCC (bb, 0)->dest == EXIT_BLOCK_PTR
+ /* BB may not have an abnormal outgoing edge. */
+ || (EDGE_SUCC (bb, 0)->flags & EDGE_ABNORMAL))
+ return false;
+
+#if ENABLE_CHECKING
+ gcc_assert (bb != ENTRY_BLOCK_PTR);
+#endif
/* Successors of the entry block are not forwarders. */
- for (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
if (e->dest == bb)
- {
- bb_ann (bb)->forwardable = 0;
- return false;
- }
-
- /* BB can not have any PHI nodes. This could potentially be relaxed
- early in compilation if we re-rewrote the variables appearing in
- any PHI nodes in forwarder blocks. */
- if (phi_nodes (bb))
- {
- bb_ann (bb)->forwardable = 0;
- return false;
- }
+ return false;
/* Now walk through the statements. We can ignore labels, anything else
means this is not a forwarder block. */
break;
default:
- bb_ann (bb)->forwardable = 0;
return false;
}
}
return true;
}
+/* Thread jumps from BB. */
-/* Thread jumps over empty statements.
-
- This code should _not_ thread over obviously equivalent conditions
- as that requires nontrivial updates to the SSA graph. */
-
static bool
-thread_jumps (void)
+thread_jumps_from_bb (basic_block bb)
{
- edge e, next, last, old;
- basic_block bb, dest, tmp;
- tree phi;
- int arg;
+ edge_iterator ei;
+ edge e;
bool retval = false;
- FOR_EACH_BB (bb)
- bb_ann (bb)->forwardable = 1;
-
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
+ /* Examine each of our block's successors to see if it is
+ forwardable. */
+ for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
{
- /* Don't waste time on unreachable blocks. */
- if (!bb->pred)
- continue;
+ int freq;
+ gcov_type count;
+ edge last, old;
+ basic_block dest, tmp, curr, old_dest;
+ tree phi;
+ int arg;
- /* Nor on forwarders. */
- if (tree_forwarder_block_p (bb))
- continue;
-
- /* This block is now part of a forwarding path, mark it as not
- forwardable so that we can detect loops. This bit will be
- reset below. */
- bb_ann (bb)->forwardable = 0;
-
- /* Examine each of our block's successors to see if it is
- forwardable. */
- for (e = bb->succ; e; e = next)
+ /* If the edge is abnormal or its destination is not
+ forwardable, then there's nothing to do. */
+ if ((e->flags & EDGE_ABNORMAL)
+ || !bb_ann (e->dest)->forwardable)
+ {
+ ei_next (&ei);
+ continue;
+ }
+
+ /* Now walk through as many forwarder blocks as possible to find
+ the ultimate destination we want to thread our jump to. */
+ last = EDGE_SUCC (e->dest, 0);
+ bb_ann (e->dest)->forwardable = 0;
+ for (dest = EDGE_SUCC (e->dest, 0)->dest;
+ bb_ann (dest)->forwardable;
+ last = EDGE_SUCC (dest, 0),
+ dest = EDGE_SUCC (dest, 0)->dest)
+ bb_ann (dest)->forwardable = 0;
+
+ /* Reset the forwardable marks to 1. */
+ for (tmp = e->dest;
+ tmp != dest;
+ tmp = EDGE_SUCC (tmp, 0)->dest)
+ bb_ann (tmp)->forwardable = 1;
+
+ if (dest == e->dest)
+ {
+ ei_next (&ei);
+ continue;
+ }
+
+ old = find_edge (bb, dest);
+ if (old)
{
- next = e->succ_next;
-
- /* If the edge is abnormal or its destination is not
- forwardable, then there's nothing to do. */
- if ((e->flags & EDGE_ABNORMAL)
- || !tree_forwarder_block_p (e->dest))
- continue;
-
- /* Now walk through as many forwarder block as possible to
- find the ultimate destination we want to thread our jump
- to. */
- last = e->dest->succ;
- bb_ann (e->dest)->forwardable = 0;
- for (dest = e->dest->succ->dest;
- tree_forwarder_block_p (dest);
- last = dest->succ,
- dest = dest->succ->dest)
+ /* If there already is an edge, check whether the values in
+ phi nodes differ. */
+ if (!phi_alternatives_equal (dest, last, old))
{
- /* An infinite loop detected. We redirect the edge anyway, so
- that the loop is shrinked into single basic block. */
- if (!bb_ann (dest)->forwardable)
- break;
+ /* The previous block is forwarder. Redirect our jump
+ to that target instead since we know it has no PHI
+ nodes that will need updating. */
+ dest = last->src;
+
+ /* That might mean that no forwarding at all is
+ possible. */
+ if (dest == e->dest)
+ {
+ ei_next (&ei);
+ continue;
+ }
- if (dest->succ->dest == EXIT_BLOCK_PTR)
- break;
+ old = find_edge (bb, dest);
+ }
+ }
- bb_ann (dest)->forwardable = 0;
+ /* Perform the redirection. */
+ retval = true;
+ count = e->count;
+ freq = EDGE_FREQUENCY (e);
+ old_dest = e->dest;
+ e = redirect_edge_and_branch (e, dest);
+
+ /* Update the profile. */
+ if (profile_status != PROFILE_ABSENT)
+ for (curr = old_dest;
+ curr != dest;
+ curr = EDGE_SUCC (curr, 0)->dest)
+ {
+ curr->frequency -= freq;
+ if (curr->frequency < 0)
+ curr->frequency = 0;
+ curr->count -= count;
+ if (curr->count < 0)
+ curr->count = 0;
+ EDGE_SUCC (curr, 0)->count -= count;
+ if (EDGE_SUCC (curr, 0)->count < 0)
+ EDGE_SUCC (curr, 0)->count = 0;
+ }
+
+ if (!old)
+ {
+ /* Update PHI nodes. We know that the new argument should
+ have the same value as the argument associated with LAST.
+ Otherwise we would have changed our target block
+ above. */
+ for (phi = phi_nodes (dest); phi; phi = PHI_CHAIN (phi))
+ {
+ arg = phi_arg_from_edge (phi, last);
+ gcc_assert (arg >= 0);
+ add_phi_arg (&phi, PHI_ARG_DEF (phi, arg), e);
}
+ }
+
+ /* Remove the unreachable blocks (observe that if all blocks
+ were reachable before, only those in the path we threaded
+ over and did not have any predecessor outside of the path
+ become unreachable). */
+ for (; old_dest != dest; old_dest = tmp)
+ {
+ tmp = EDGE_SUCC (old_dest, 0)->dest;
+
+ if (EDGE_COUNT (old_dest->preds) > 0)
+ break;
+
+ delete_basic_block (old_dest);
+ }
- /* Reset the forwardable marks to 1. */
- for (tmp = e->dest;
- tmp != dest;
- tmp = tmp->succ->dest)
- bb_ann (tmp)->forwardable = 1;
-
- if (dest == e->dest)
- continue;
-
- old = find_edge (bb, dest);
- if (old)
+ /* Update the dominators. */
+ if (dom_info_available_p (CDI_DOMINATORS))
+ {
+ /* If the dominator of the destination was in the
+ path, set its dominator to the start of the
+ redirected edge. */
+ if (get_immediate_dominator (CDI_DOMINATORS, old_dest) == NULL)
+ set_immediate_dominator (CDI_DOMINATORS, old_dest, bb);
+
+ /* Now proceed like if we forwarded just over one edge at a
+ time. Algorithm for forwarding edge S --> A over
+ edge A --> B then is
+
+ if (idom (B) == A
+ && !dominated_by (S, B))
+ idom (B) = idom (A);
+ recount_idom (A); */
+
+ for (; old_dest != dest; old_dest = tmp)
{
- /* If there already is an edge, check whether the values
- in phi nodes differ. */
- if (!phi_alternatives_equal (dest, last, old))
- {
- /* The previous block is forwarder. Redirect our jump
- to that target instead since we know it has no PHI
- nodes that will need updating. */
- dest = last->src;
-
- /* That might mean that no forwarding at all is possible. */
- if (dest == e->dest)
- continue;
+ basic_block dom;
+
+ tmp = EDGE_SUCC (old_dest, 0)->dest;
- old = find_edge (bb, dest);
+ if (get_immediate_dominator (CDI_DOMINATORS, tmp) == old_dest
+ && !dominated_by_p (CDI_DOMINATORS, bb, tmp))
+ {
+ dom = get_immediate_dominator (CDI_DOMINATORS, old_dest);
+ set_immediate_dominator (CDI_DOMINATORS, tmp, dom);
}
+
+ dom = recount_dominator (CDI_DOMINATORS, old_dest);
+ set_immediate_dominator (CDI_DOMINATORS, old_dest, dom);
}
+ }
+ }
+
+ return retval;
+}
- /* Perform the redirection. */
- retval = true;
- e = redirect_edge_and_branch (e, dest);
- /* TODO -- updating dominators in this case is simple. */
- free_dominance_info (CDI_DOMINATORS);
+/* Thread jumps over empty statements.
+
+ This code should _not_ thread over obviously equivalent conditions
+ as that requires nontrivial updates to the SSA graph.
+
+ As a precondition, we require that all basic blocks be reachable.
+ That is, there should be no opportunities left for
+ delete_unreachable_blocks. */
+
+static bool
+thread_jumps (void)
+{
+ basic_block bb;
+ bool retval = false;
+ basic_block *worklist = xmalloc (sizeof (basic_block) * last_basic_block);
+ basic_block *current = worklist;
+
+ FOR_EACH_BB (bb)
+ {
+ bb_ann (bb)->forwardable = tree_forwarder_block_p (bb);
+ bb->flags &= ~BB_VISITED;
+ }
+
+ /* We pretend to have ENTRY_BLOCK_PTR in WORKLIST. This way,
+ ENTRY_BLOCK_PTR will never be entered into WORKLIST. */
+ ENTRY_BLOCK_PTR->flags |= BB_VISITED;
+
+ /* Initialize WORKLIST by putting non-forwarder blocks that
+ immediately precede forwarder blocks because those are the ones
+ that we know we can thread jumps from. We use BB_VISITED to
+ indicate whether a given basic block is in WORKLIST or not,
+ thereby avoiding duplicates in WORKLIST. */
+ FOR_EACH_BB (bb)
+ {
+ edge_iterator ei;
+ edge e;
+
+ /* We are not interested in finding non-forwarder blocks
+ directly. We want to find non-forwarder blocks as
+ predecessors of a forwarder block. */
+ if (!bb_ann (bb)->forwardable)
+ continue;
- if (!old)
+ /* Now we know BB is a forwarder block. Visit each of its
+ incoming edges and add to WORKLIST all non-forwarder blocks
+ among BB's predecessors. */
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ {
+ /* We don't want to put a duplicate into WORKLIST. */
+ if ((e->src->flags & BB_VISITED) == 0
+ /* We are not interested in threading jumps from a forwarder
+ block. */
+ && !bb_ann (e->src)->forwardable)
+ {
+ e->src->flags |= BB_VISITED;
+ *current++ = e->src;
+ }
+ }
+ }
+
+ /* Now let's drain WORKLIST. */
+ while (worklist != current)
+ {
+ bb = *--current;
+
+ /* BB is no longer in WORKLIST, so clear BB_VISITED. */
+ bb->flags &= ~BB_VISITED;
+
+ if (thread_jumps_from_bb (bb))
+ {
+ retval = true;
+
+ if (tree_forwarder_block_p (bb))
{
- /* Update PHI nodes. We know that the new argument should
- have the same value as the argument associated with LAST.
- Otherwise we would have changed our target block above. */
- for (phi = phi_nodes (dest); phi; phi = TREE_CHAIN (phi))
+ edge_iterator ej;
+ edge f;
+
+ bb_ann (bb)->forwardable = true;
+
+ /* Attempts to thread through BB may have been blocked
+ because BB was not a forwarder block before. Now
+ that BB is a forwarder block, we should revisit BB's
+ predecessors. */
+ FOR_EACH_EDGE (f, ej, bb->preds)
{
- arg = phi_arg_from_edge (phi, last);
- if (arg < 0)
- abort ();
- add_phi_arg (&phi, PHI_ARG_DEF (phi, arg), e);
+ /* We don't want to put a duplicate into WORKLIST. */
+ if ((f->src->flags & BB_VISITED) == 0
+ /* We are not interested in threading jumps from a
+ forwarder block. */
+ && !bb_ann (f->src)->forwardable)
+ {
+ f->src->flags |= BB_VISITED;
+ *current++ = f->src;
+ }
}
}
}
-
- /* Reset the forwardable bit on our block since it's no longer in
- a forwarding chain path. */
- bb_ann (bb)->forwardable = 1;
}
+ ENTRY_BLOCK_PTR->flags &= ~BB_VISITED;
+
+ free (worklist);
+
return retval;
}
/* Return a non-special label in the head of basic block BLOCK.
Create one if it doesn't exist. */
-static tree
+tree
tree_block_label (basic_block bb)
{
block_stmt_iterator i, s = bsi_start (bb);
edge tmp;
block_stmt_iterator b;
tree stmt;
+ edge_iterator ei;
/* Verify that all targets will be TARGET. */
- for (tmp = src->succ; tmp; tmp = tmp->succ_next)
+ FOR_EACH_EDGE (tmp, ei, src->succs)
if (tmp->dest != target && tmp != e)
break;
case GOTO_EXPR:
/* No non-abnormal edges should lead from a non-simple goto, and
simple ones should be represented implicitly. */
- abort ();
+ gcc_unreachable ();
case SWITCH_EXPR:
{
default:
/* Otherwise it must be a fallthru edge, and we don't need to
do anything besides redirecting it. */
- if (!(e->flags & EDGE_FALLTHRU))
- abort ();
+ gcc_assert (e->flags & EDGE_FALLTHRU);
break;
}
tree_redirect_edge_and_branch_force (edge e, basic_block dest)
{
e = tree_redirect_edge_and_branch (e, dest);
- if (!e)
- abort ();
+ gcc_assert (e);
return NULL;
}
tree act;
basic_block new_bb;
edge e;
+ edge_iterator ei;
new_bb = create_empty_bb (bb);
/* Redirect the outgoing edges. */
- new_bb->succ = bb->succ;
- bb->succ = NULL;
- for (e = new_bb->succ; e; e = e->succ_next)
+ new_bb->succs = bb->succs;
+ bb->succs = NULL;
+ FOR_EACH_EDGE (e, ei, new_bb->succs)
e->src = new_bb;
if (stmt && TREE_CODE ((tree) stmt) == LABEL_EXPR)
return true;
}
-
/* Create a duplicate of the basic block BB. NOTE: This does not
preserve SSA form. */
{
basic_block new_bb;
block_stmt_iterator bsi, bsi_tgt;
+ tree phi, val;
+ ssa_op_iter op_iter;
new_bb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
+
+ /* First copy the phi nodes. We do not copy phi node arguments here,
+ since the edges are not ready yet. Keep the chain of phi nodes in
+ the same order, so that we can add them later. */
+ for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ {
+ mark_for_rewrite (PHI_RESULT (phi));
+ create_phi_node (PHI_RESULT (phi), new_bb);
+ }
+ set_phi_nodes (new_bb, phi_reverse (phi_nodes (new_bb)));
+
bsi_tgt = bsi_start (new_bb);
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
{
tree stmt = bsi_stmt (bsi);
+ tree copy;
if (TREE_CODE (stmt) == LABEL_EXPR)
continue;
- bsi_insert_after (&bsi_tgt, unshare_expr (stmt), BSI_NEW_STMT);
+ /* Record the definitions. */
+ get_stmt_operands (stmt);
+
+ FOR_EACH_SSA_TREE_OPERAND (val, stmt, op_iter, SSA_OP_ALL_DEFS)
+ mark_for_rewrite (val);
+
+ copy = unshare_expr (stmt);
+
+ /* Copy also the virtual operands. */
+ get_stmt_ann (copy);
+ copy_virtual_operands (copy, stmt);
+
+ bsi_insert_after (&bsi_tgt, copy, BSI_NEW_STMT);
}
return new_bb;
}
+/* Basic block BB_COPY was created by code duplication. Add phi node
+ arguments for edges going out of BB_COPY. The blocks that were
+ duplicated have rbi->duplicated set to one. */
+
+void
+add_phi_args_after_copy_bb (basic_block bb_copy)
+{
+ basic_block bb, dest;
+ edge e, e_copy;
+ edge_iterator ei;
+ tree phi, phi_copy, phi_next, def;
+
+ bb = bb_copy->rbi->original;
+
+ FOR_EACH_EDGE (e_copy, ei, bb_copy->succs)
+ {
+ if (!phi_nodes (e_copy->dest))
+ continue;
+
+ if (e_copy->dest->rbi->duplicated)
+ dest = e_copy->dest->rbi->original;
+ else
+ dest = e_copy->dest;
+
+ e = find_edge (bb, dest);
+ if (!e)
+ {
+ /* During loop unrolling the target of the latch edge is copied.
+ In this case we are not looking for edge to dest, but to
+ duplicated block whose original was dest. */
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (e->dest->rbi->duplicated
+ && e->dest->rbi->original == dest)
+ break;
+
+ gcc_assert (e != NULL);
+ }
+
+ for (phi = phi_nodes (e->dest), phi_copy = phi_nodes (e_copy->dest);
+ phi;
+ phi = phi_next, phi_copy = TREE_CHAIN (phi_copy))
+ {
+ phi_next = TREE_CHAIN (phi);
+
+ gcc_assert (PHI_RESULT (phi) == PHI_RESULT (phi_copy));
+ def = PHI_ARG_DEF_FROM_EDGE (phi, e);
+ add_phi_arg (&phi_copy, def, e_copy);
+ }
+ }
+}
+
+/* Blocks in REGION_COPY array of length N_REGION were created by
+ duplication of basic blocks. Add phi node arguments for edges
+ going from these blocks. */
+
+void
+add_phi_args_after_copy (basic_block *region_copy, unsigned n_region)
+{
+ unsigned i;
+
+ for (i = 0; i < n_region; i++)
+ region_copy[i]->rbi->duplicated = 1;
+
+ for (i = 0; i < n_region; i++)
+ add_phi_args_after_copy_bb (region_copy[i]);
+
+ for (i = 0; i < n_region; i++)
+ region_copy[i]->rbi->duplicated = 0;
+}
+
+/* Maps the old ssa name FROM_NAME to TO_NAME. */
+
+struct ssa_name_map_entry
+{
+ tree from_name;
+ tree to_name;
+};
+
+/* Hash function for ssa_name_map_entry. */
+
+static hashval_t
+ssa_name_map_entry_hash (const void *entry)
+{
+ const struct ssa_name_map_entry *en = entry;
+ return SSA_NAME_VERSION (en->from_name);
+}
+
+/* Equality function for ssa_name_map_entry. */
+
+static int
+ssa_name_map_entry_eq (const void *in_table, const void *ssa_name)
+{
+ const struct ssa_name_map_entry *en = in_table;
+
+ return en->from_name == ssa_name;
+}
+
+/* Allocate duplicates of ssa names in list DEFINITIONS and store the mapping
+ to MAP. */
+
+void
+allocate_ssa_names (bitmap definitions, htab_t *map)
+{
+ tree name;
+ struct ssa_name_map_entry *entry;
+ PTR *slot;
+ unsigned ver;
+ bitmap_iterator bi;
+
+ if (!*map)
+ *map = htab_create (10, ssa_name_map_entry_hash,
+ ssa_name_map_entry_eq, free);
+ EXECUTE_IF_SET_IN_BITMAP (definitions, 0, ver, bi)
+ {
+ name = ssa_name (ver);
+ slot = htab_find_slot_with_hash (*map, name, SSA_NAME_VERSION (name),
+ INSERT);
+ if (*slot)
+ entry = *slot;
+ else
+ {
+ entry = xmalloc (sizeof (struct ssa_name_map_entry));
+ entry->from_name = name;
+ *slot = entry;
+ }
+ entry->to_name = duplicate_ssa_name (name, SSA_NAME_DEF_STMT (name));
+ }
+}
+
+/* Rewrite the definition DEF in statement STMT to new ssa name as specified
+ by the mapping MAP. */
+
+static void
+rewrite_to_new_ssa_names_def (def_operand_p def, tree stmt, htab_t map)
+{
+ tree name = DEF_FROM_PTR (def);
+ struct ssa_name_map_entry *entry;
+
+ gcc_assert (TREE_CODE (name) == SSA_NAME);
+
+ entry = htab_find_with_hash (map, name, SSA_NAME_VERSION (name));
+ if (!entry)
+ return;
+
+ SET_DEF (def, entry->to_name);
+ SSA_NAME_DEF_STMT (entry->to_name) = stmt;
+}
+
+/* Rewrite the USE to new ssa name as specified by the mapping MAP. */
+
+static void
+rewrite_to_new_ssa_names_use (use_operand_p use, htab_t map)
+{
+ tree name = USE_FROM_PTR (use);
+ struct ssa_name_map_entry *entry;
+
+ if (TREE_CODE (name) != SSA_NAME)
+ return;
+
+ entry = htab_find_with_hash (map, name, SSA_NAME_VERSION (name));
+ if (!entry)
+ return;
+
+ SET_USE (use, entry->to_name);
+}
+
+/* Rewrite the ssa names in basic block BB to new ones as specified by the
+ mapping MAP. */
+
+void
+rewrite_to_new_ssa_names_bb (basic_block bb, htab_t map)
+{
+ unsigned i;
+ edge e;
+ edge_iterator ei;
+ tree phi, stmt;
+ block_stmt_iterator bsi;
+ use_optype uses;
+ vuse_optype vuses;
+ def_optype defs;
+ v_may_def_optype v_may_defs;
+ v_must_def_optype v_must_defs;
+ stmt_ann_t ann;
+
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ if (e->flags & EDGE_ABNORMAL)
+ break;
+
+ for (phi = phi_nodes (bb); phi; phi = PHI_CHAIN (phi))
+ {
+ rewrite_to_new_ssa_names_def (PHI_RESULT_PTR (phi), phi, map);
+ if (e)
+ SSA_NAME_OCCURS_IN_ABNORMAL_PHI (PHI_RESULT (phi)) = 1;
+ }
+
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ stmt = bsi_stmt (bsi);
+ get_stmt_operands (stmt);
+ ann = stmt_ann (stmt);
+
+ uses = USE_OPS (ann);
+ for (i = 0; i < NUM_USES (uses); i++)
+ rewrite_to_new_ssa_names_use (USE_OP_PTR (uses, i), map);
+
+ defs = DEF_OPS (ann);
+ for (i = 0; i < NUM_DEFS (defs); i++)
+ rewrite_to_new_ssa_names_def (DEF_OP_PTR (defs, i), stmt, map);
+
+ vuses = VUSE_OPS (ann);
+ for (i = 0; i < NUM_VUSES (vuses); i++)
+ rewrite_to_new_ssa_names_use (VUSE_OP_PTR (vuses, i), map);
+
+ v_may_defs = V_MAY_DEF_OPS (ann);
+ for (i = 0; i < NUM_V_MAY_DEFS (v_may_defs); i++)
+ {
+ rewrite_to_new_ssa_names_use
+ (V_MAY_DEF_OP_PTR (v_may_defs, i), map);
+ rewrite_to_new_ssa_names_def
+ (V_MAY_DEF_RESULT_PTR (v_may_defs, i), stmt, map);
+ }
+
+ v_must_defs = V_MUST_DEF_OPS (ann);
+ for (i = 0; i < NUM_V_MUST_DEFS (v_must_defs); i++)
+ {
+ rewrite_to_new_ssa_names_def
+ (V_MUST_DEF_RESULT_PTR (v_must_defs, i), stmt, map);
+ rewrite_to_new_ssa_names_use
+ (V_MUST_DEF_KILL_PTR (v_must_defs, i), map);
+ }
+ }
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ for (phi = phi_nodes (e->dest); phi; phi = PHI_CHAIN (phi))
+ {
+ rewrite_to_new_ssa_names_use
+ (PHI_ARG_DEF_PTR_FROM_EDGE (phi, e), map);
+
+ if (e->flags & EDGE_ABNORMAL)
+ {
+ tree op = PHI_ARG_DEF_FROM_EDGE (phi, e);
+ SSA_NAME_OCCURS_IN_ABNORMAL_PHI (op) = 1;
+ }
+ }
+}
+
+/* Rewrite the ssa names in N_REGION blocks REGION to the new ones as specified
+ by the mapping MAP. */
+
+void
+rewrite_to_new_ssa_names (basic_block *region, unsigned n_region, htab_t map)
+{
+ unsigned r;
+
+ for (r = 0; r < n_region; r++)
+ rewrite_to_new_ssa_names_bb (region[r], map);
+}
+
+/* Duplicates a REGION (set of N_REGION basic blocks) with just a single
+ important exit edge EXIT. By important we mean that no SSA name defined
+ inside region is live over the other exit edges of the region. All entry
+ edges to the region must go to ENTRY->dest. The edge ENTRY is redirected
+ to the duplicate of the region. SSA form, dominance and loop information
+ is updated. The new basic blocks are stored to REGION_COPY in the same
+ order as they had in REGION, provided that REGION_COPY is not NULL.
+ The function returns false if it is unable to copy the region,
+ true otherwise. */
+
+bool
+tree_duplicate_sese_region (edge entry, edge exit,
+ basic_block *region, unsigned n_region,
+ basic_block *region_copy)
+{
+ unsigned i, n_doms, ver;
+ bool free_region_copy = false, copying_header = false;
+ struct loop *loop = entry->dest->loop_father;
+ edge exit_copy;
+ bitmap definitions;
+ tree phi;
+ basic_block *doms;
+ htab_t ssa_name_map = NULL;
+ edge redirected;
+ bitmap_iterator bi;
+
+ if (!can_copy_bbs_p (region, n_region))
+ return false;
+
+ /* Some sanity checking. Note that we do not check for all possible
+ missuses of the functions. I.e. if you ask to copy something weird,
+ it will work, but the state of structures probably will not be
+ correct. */
+
+ for (i = 0; i < n_region; i++)
+ {
+ /* We do not handle subloops, i.e. all the blocks must belong to the
+ same loop. */
+ if (region[i]->loop_father != loop)
+ return false;
+
+ if (region[i] != entry->dest
+ && region[i] == loop->header)
+ return false;
+ }
+
+ loop->copy = loop;
+
+ /* In case the function is used for loop header copying (which is the primary
+ use), ensure that EXIT and its copy will be new latch and entry edges. */
+ if (loop->header == entry->dest)
+ {
+ copying_header = true;
+ loop->copy = loop->outer;
+
+ if (!dominated_by_p (CDI_DOMINATORS, loop->latch, exit->src))
+ return false;
+
+ for (i = 0; i < n_region; i++)
+ if (region[i] != exit->src
+ && dominated_by_p (CDI_DOMINATORS, region[i], exit->src))
+ return false;
+ }
+
+ if (!region_copy)
+ {
+ region_copy = xmalloc (sizeof (basic_block) * n_region);
+ free_region_copy = true;
+ }
+
+ gcc_assert (!any_marked_for_rewrite_p ());
+
+ /* Record blocks outside the region that are duplicated by something
+ inside. */
+ doms = xmalloc (sizeof (basic_block) * n_basic_blocks);
+ n_doms = get_dominated_by_region (CDI_DOMINATORS, region, n_region, doms);
+
+ copy_bbs (region, n_region, region_copy, &exit, 1, &exit_copy, loop);
+ definitions = marked_ssa_names ();
+
+ if (copying_header)
+ {
+ loop->header = exit->dest;
+ loop->latch = exit->src;
+ }
+
+ /* Redirect the entry and add the phi node arguments. */
+ redirected = redirect_edge_and_branch (entry, entry->dest->rbi->copy);
+ gcc_assert (redirected != NULL);
+ flush_pending_stmts (entry);
+
+ /* Concerning updating of dominators: We must recount dominators
+ for entry block and its copy. Anything that is outside of the region, but
+ was dominated by something inside needs recounting as well. */
+ set_immediate_dominator (CDI_DOMINATORS, entry->dest, entry->src);
+ doms[n_doms++] = entry->dest->rbi->original;
+ iterate_fix_dominators (CDI_DOMINATORS, doms, n_doms);
+ free (doms);
+
+ /* Add the other phi node arguments. */
+ add_phi_args_after_copy (region_copy, n_region);
+
+ /* Add phi nodes for definitions at exit. TODO -- once we have immediate
+ uses, it should be possible to emit phi nodes just for definitions that
+ are used outside region. */
+ EXECUTE_IF_SET_IN_BITMAP (definitions, 0, ver, bi)
+ {
+ tree name = ssa_name (ver);
+
+ phi = create_phi_node (name, exit->dest);
+ add_phi_arg (&phi, name, exit);
+ add_phi_arg (&phi, name, exit_copy);
+
+ SSA_NAME_DEF_STMT (name) = phi;
+ }
+
+ /* And create new definitions inside region and its copy. TODO -- once we
+ have immediate uses, it might be better to leave definitions in region
+ unchanged, create new ssa names for phi nodes on exit, and rewrite
+ the uses, to avoid changing the copied region. */
+ allocate_ssa_names (definitions, &ssa_name_map);
+ rewrite_to_new_ssa_names (region, n_region, ssa_name_map);
+ allocate_ssa_names (definitions, &ssa_name_map);
+ rewrite_to_new_ssa_names (region_copy, n_region, ssa_name_map);
+ htab_delete (ssa_name_map);
+
+ if (free_region_copy)
+ free (region_copy);
+
+ unmark_all_for_rewrite ();
+ BITMAP_XFREE (definitions);
+
+ return true;
+}
/* Dump FUNCTION_DECL FN to file FILE using FLAGS (see TDF_* in tree.h) */
if (basic_block_info)
{
/* Make a CFG based dump. */
+ check_bb_profile (ENTRY_BLOCK_PTR, file);
if (!ignore_topmost_bind)
fprintf (file, "{\n");
dump_generic_bb (file, bb, 2, flags);
fprintf (file, "}\n");
+ check_bb_profile (EXIT_BLOCK_PTR, file);
}
else
{
/* Pretty print of the loops intermediate representation. */
static void print_loop (FILE *, struct loop *, int);
-static void print_pred_bbs (FILE *, edge);
-static void print_succ_bbs (FILE *, edge);
+static void print_pred_bbs (FILE *, basic_block bb);
+static void print_succ_bbs (FILE *, basic_block bb);
/* Print the predecessors indexes of edge E on FILE. */
static void
-print_pred_bbs (FILE *file, edge e)
+print_pred_bbs (FILE *file, basic_block bb)
{
- if (e == NULL)
- return;
-
- else if (e->pred_next == NULL)
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->preds)
fprintf (file, "bb_%d", e->src->index);
-
- else
- {
- fprintf (file, "bb_%d, ", e->src->index);
- print_pred_bbs (file, e->pred_next);
- }
}
/* Print the successors indexes of edge E on FILE. */
static void
-print_succ_bbs (FILE *file, edge e)
+print_succ_bbs (FILE *file, basic_block bb)
{
- if (e == NULL)
- return;
- else if (e->succ_next == NULL)
- fprintf (file, "bb_%d", e->dest->index);
- else
- {
- fprintf (file, "bb_%d, ", e->dest->index);
- print_succ_bbs (file, e->succ_next);
- }
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ fprintf (file, "bb_%d", e->src->index);
}
{
/* Print the basic_block's header. */
fprintf (file, "%s bb_%d (preds = {", s_indent, bb->index);
- print_pred_bbs (file, bb->pred);
+ print_pred_bbs (file, bb);
fprintf (file, "}, succs = {");
- print_succ_bbs (file, bb->succ);
+ print_succ_bbs (file, bb);
fprintf (file, "})\n");
/* Print the basic_block's body. */
tree_block_ends_with_call_p (basic_block bb)
{
block_stmt_iterator bsi = bsi_last (bb);
- tree t = tsi_stmt (bsi.tsi);
-
- if (TREE_CODE (t) == RETURN_EXPR && TREE_OPERAND (t, 0))
- t = TREE_OPERAND (t, 0);
-
- if (TREE_CODE (t) == MODIFY_EXPR)
- t = TREE_OPERAND (t, 1);
-
- return TREE_CODE (t) == CALL_EXPR;
+ return get_call_expr_in (bsi_stmt (bsi)) != NULL;
}
static bool
need_fake_edge_p (tree t)
{
- if (TREE_CODE (t) == RETURN_EXPR && TREE_OPERAND (t, 0))
- t = TREE_OPERAND (t, 0);
-
- if (TREE_CODE (t) == MODIFY_EXPR)
- t = TREE_OPERAND (t, 1);
+ tree call;
/* NORETURN and LONGJMP calls already have an edge to exit.
CONST, PURE and ALWAYS_RETURN calls do not need one.
figured out from the RTL in mark_constant_function, and
the counter incrementation code from -fprofile-arcs
leads to different results from -fbranch-probabilities. */
- if (TREE_CODE (t) == CALL_EXPR
- && !(call_expr_flags (t) &
- (ECF_NORETURN | ECF_LONGJMP | ECF_ALWAYS_RETURN)))
+ call = get_call_expr_in (t);
+ if (call
+ && !(call_expr_flags (call) &
+ (ECF_NORETURN | ECF_LONGJMP | ECF_ALWAYS_RETURN)))
return true;
if (TREE_CODE (t) == ASM_EXPR
Handle this by adding a dummy instruction in a new last basic block. */
if (check_last_block)
{
+ edge_iterator ei;
basic_block bb = EXIT_BLOCK_PTR->prev_bb;
block_stmt_iterator bsi = bsi_last (bb);
tree t = NULL_TREE;
{
edge e;
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (e->dest == EXIT_BLOCK_PTR)
{
bsi_insert_on_edge (e, build_empty_stmt ());
mark that edge as fake and remove it later. */
#ifdef ENABLE_CHECKING
if (stmt == last_stmt)
- for (e = bb->succ; e; e = e->succ_next)
- if (e->dest == EXIT_BLOCK_PTR)
- abort ();
+ {
+ edge_iterator ei;
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ gcc_assert (e->dest != EXIT_BLOCK_PTR);
+ }
#endif
/* Note that the following may create a new basic block
return blocks_split;
}
+bool
+tree_purge_dead_eh_edges (basic_block bb)
+{
+ bool changed = false;
+ edge e;
+ edge_iterator ei;
+ tree stmt = last_stmt (bb);
+
+ if (stmt && tree_can_throw_internal (stmt))
+ return false;
+
+ for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
+ {
+ if (e->flags & EDGE_EH)
+ {
+ ssa_remove_edge (e);
+ changed = true;
+ }
+ else
+ ei_next (&ei);
+ }
+
+ /* Removal of dead EH edges might change dominators of not
+ just immediate successors. E.g. when bb1 is changed so that
+ it no longer can throw and bb1->bb3 and bb1->bb4 are dead
+ eh edges purged by this function in:
+ 0
+ / \
+ v v
+ 1-->2
+ / \ |
+ v v |
+ 3-->4 |
+ \ v
+ --->5
+ |
+ -
+ idom(bb5) must be recomputed. For now just free the dominance
+ info. */
+ if (changed)
+ free_dominance_info (CDI_DOMINATORS);
+
+ return changed;
+}
+
+bool
+tree_purge_all_dead_eh_edges (bitmap blocks)
+{
+ bool changed = false;
+ unsigned i;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (blocks, 0, i, bi)
+ {
+ changed |= tree_purge_dead_eh_edges (BASIC_BLOCK (i));
+ }
+
+ return changed;
+}
struct cfg_hooks tree_cfg_hooks = {
"tree",
{
basic_block bb;
edge e;
+ edge_iterator ei;
FOR_ALL_BB (bb)
{
- for (e = bb->succ; e ; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (EDGE_CRITICAL_P (e) && !(e->flags & EDGE_ABNORMAL))
{
split_edge (e);
struct tree_opt_pass pass_split_crit_edges =
{
- NULL, /* name */
+ "crited", /* name */
NULL, /* gate */
split_critical_edges, /* execute */
NULL, /* sub */
PROP_no_crit_edges, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0, /* todo_flags_finish */
+ TODO_dump_func, /* todo_flags_finish */
+ 0 /* letter */
};
+
+\f
+/* Return EXP if it is a valid GIMPLE rvalue, else gimplify it into
+ a temporary, make sure and register it to be renamed if necessary,
+ and finally return the temporary. Put the statements to compute
+ EXP before the current statement in BSI. */
+
+tree
+gimplify_val (block_stmt_iterator *bsi, tree type, tree exp)
+{
+ tree t, new_stmt, orig_stmt;
+
+ if (is_gimple_val (exp))
+ return exp;
+
+ t = make_rename_temp (type, NULL);
+ new_stmt = build (MODIFY_EXPR, type, t, exp);
+
+ orig_stmt = bsi_stmt (*bsi);
+ SET_EXPR_LOCUS (new_stmt, EXPR_LOCUS (orig_stmt));
+ TREE_BLOCK (new_stmt) = TREE_BLOCK (orig_stmt);
+
+ bsi_insert_before (bsi, new_stmt, BSI_SAME_STMT);
+
+ return t;
+}
+
+/* Build a ternary operation and gimplify it. Emit code before BSI.
+ Return the gimple_val holding the result. */
+
+tree
+gimplify_build3 (block_stmt_iterator *bsi, enum tree_code code,
+ tree type, tree a, tree b, tree c)
+{
+ tree ret;
+
+ ret = fold (build3 (code, type, a, b, c));
+ STRIP_NOPS (ret);
+
+ return gimplify_val (bsi, type, ret);
+}
+
+/* Build a binary operation and gimplify it. Emit code before BSI.
+ Return the gimple_val holding the result. */
+
+tree
+gimplify_build2 (block_stmt_iterator *bsi, enum tree_code code,
+ tree type, tree a, tree b)
+{
+ tree ret;
+
+ ret = fold (build2 (code, type, a, b));
+ STRIP_NOPS (ret);
+
+ return gimplify_val (bsi, type, ret);
+}
+
+/* Build a unary operation and gimplify it. Emit code before BSI.
+ Return the gimple_val holding the result. */
+
+tree
+gimplify_build1 (block_stmt_iterator *bsi, enum tree_code code, tree type,
+ tree a)
+{
+ tree ret;
+
+ ret = fold (build1 (code, type, a));
+ STRIP_NOPS (ret);
+
+ return gimplify_val (bsi, type, ret);
+}
+
+
\f
/* Emit return warnings. */
static void
execute_warn_function_return (void)
{
+#ifdef USE_MAPPED_LOCATION
+ source_location location;
+#else
location_t *locus;
+#endif
tree last;
edge e;
+ edge_iterator ei;
if (warn_missing_noreturn
&& !TREE_THIS_VOLATILE (cfun->decl)
- && EXIT_BLOCK_PTR->pred == NULL
+ && EDGE_COUNT (EXIT_BLOCK_PTR->preds) == 0
&& !lang_hooks.function.missing_noreturn_ok_p (cfun->decl))
- warning ("%Jfunction might be possible candidate for attribute `noreturn'",
+ warning ("%Jfunction might be possible candidate for "
+ "attribute %<noreturn%>",
cfun->decl);
/* If we have a path to EXIT, then we do return. */
if (TREE_THIS_VOLATILE (cfun->decl)
- && EXIT_BLOCK_PTR->pred != NULL)
+ && EDGE_COUNT (EXIT_BLOCK_PTR->preds) > 0)
{
+#ifdef USE_MAPPED_LOCATION
+ location = UNKNOWN_LOCATION;
+#else
locus = NULL;
- for (e = EXIT_BLOCK_PTR->pred; e ; e = e->pred_next)
+#endif
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
{
last = last_stmt (e->src);
if (TREE_CODE (last) == RETURN_EXPR
+#ifdef USE_MAPPED_LOCATION
+ && (location = EXPR_LOCATION (last)) != UNKNOWN_LOCATION)
+#else
&& (locus = EXPR_LOCUS (last)) != NULL)
+#endif
break;
}
+#ifdef USE_MAPPED_LOCATION
+ if (location == UNKNOWN_LOCATION)
+ location = cfun->function_end_locus;
+ warning ("%H%<noreturn%> function does return", &location);
+#else
if (!locus)
locus = &cfun->function_end_locus;
- warning ("%H`noreturn' function does return", locus);
+ warning ("%H%<noreturn%> function does return", locus);
+#endif
}
/* If we see "return;" in some basic block, then we do reach the end
without returning a value. */
else if (warn_return_type
- && EXIT_BLOCK_PTR->pred != NULL
+ && EDGE_COUNT (EXIT_BLOCK_PTR->preds) > 0
&& !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (cfun->decl))))
{
- for (e = EXIT_BLOCK_PTR->pred; e ; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
{
tree last = last_stmt (e->src);
if (TREE_CODE (last) == RETURN_EXPR
&& TREE_OPERAND (last, 0) == NULL)
{
+#ifdef USE_MAPPED_LOCATION
+ location = EXPR_LOCATION (last);
+ if (location == UNKNOWN_LOCATION)
+ location = cfun->function_end_locus;
+ warning ("%Hcontrol reaches end of non-void function", &location);
+#else
locus = EXPR_LOCUS (last);
if (!locus)
locus = &cfun->function_end_locus;
warning ("%Hcontrol reaches end of non-void function", locus);
+#endif
break;
}
}
edge *true_edge,
edge *false_edge)
{
- edge e = b->succ;
+ edge e = EDGE_SUCC (b, 0);
if (e->flags & EDGE_TRUE_VALUE)
{
*true_edge = e;
- *false_edge = e->succ_next;
+ *false_edge = EDGE_SUCC (b, 1);
}
else
{
*false_edge = e;
- *true_edge = e->succ_next;
+ *true_edge = EDGE_SUCC (b, 1);
}
}
NULL, /* next */
0, /* static_pass_number */
0, /* tv_id */
- PROP_ssa, /* properties_required */
+ PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
- 0 /* todo_flags_finish */
+ 0, /* todo_flags_finish */
+ 0 /* letter */
};
#include "gt-tree-cfg.h"
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