/* C++-specific tree lowering bits; see also c-gimplify.c and tree-gimple.c.
- Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@redhat.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "cp-tree.h"
#include "c-common.h"
#include "toplev.h"
-#include "tree-gimple.h"
+#include "tree-iterator.h"
+#include "gimple.h"
#include "hashtab.h"
+#include "pointer-set.h"
+#include "flags.h"
+
+/* Local declarations. */
+
+enum bc_t { bc_break = 0, bc_continue = 1 };
+
+/* Stack of labels which are targets for "break" or "continue",
+ linked through TREE_CHAIN. */
+static tree bc_label[2];
+
+/* Begin a scope which can be exited by a break or continue statement. BC
+ indicates which.
+
+ Just creates a label and pushes it into the current context. */
+
+static tree
+begin_bc_block (enum bc_t bc)
+{
+ tree label = create_artificial_label ();
+ TREE_CHAIN (label) = bc_label[bc];
+ bc_label[bc] = label;
+ return label;
+}
+
+/* Finish a scope which can be exited by a break or continue statement.
+ LABEL was returned from the most recent call to begin_bc_block. BODY is
+ an expression for the contents of the scope.
+
+ If we saw a break (or continue) in the scope, append a LABEL_EXPR to
+ body. Otherwise, just forget the label. */
+
+static gimple_seq
+finish_bc_block (enum bc_t bc, tree label, gimple_seq body)
+{
+ gcc_assert (label == bc_label[bc]);
+
+ if (TREE_USED (label))
+ {
+ gimple_seq_add_stmt (&body, gimple_build_label (label));
+ }
+
+ bc_label[bc] = TREE_CHAIN (label);
+ TREE_CHAIN (label) = NULL_TREE;
+ return body;
+}
+
+/* Get the LABEL_EXPR to represent a break or continue statement
+ in the current block scope. BC indicates which. */
+
+static tree
+get_bc_label (enum bc_t bc)
+{
+ tree label = bc_label[bc];
+
+ if (label == NULL_TREE)
+ {
+ if (bc == bc_break)
+ error ("break statement not within loop or switch");
+ else
+ error ("continue statement not within loop or switch");
+
+ return NULL_TREE;
+ }
+
+ /* Mark the label used for finish_bc_block. */
+ TREE_USED (label) = 1;
+ return label;
+}
/* Genericize a TRY_BLOCK. */
tree body = TRY_STMTS (*stmt_p);
tree cleanup = TRY_HANDLERS (*stmt_p);
- gimplify_stmt (&body);
-
- if (CLEANUP_P (*stmt_p))
- /* A cleanup is an expression, so it doesn't need to be genericized. */;
- else
- gimplify_stmt (&cleanup);
-
*stmt_p = build2 (TRY_CATCH_EXPR, void_type_node, body, cleanup);
}
tree type = HANDLER_TYPE (*stmt_p);
tree body = HANDLER_BODY (*stmt_p);
- gimplify_stmt (&body);
-
/* FIXME should the caught type go in TREE_TYPE? */
*stmt_p = build2 (CATCH_EXPR, void_type_node, type, body);
}
+/* A terser interface for building a representation of an exception
+ specification. */
+
+static tree
+build_gimple_eh_filter_tree (tree body, tree allowed, tree failure)
+{
+ tree t;
+
+ /* FIXME should the allowed types go in TREE_TYPE? */
+ t = build2 (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE);
+ append_to_statement_list (failure, &EH_FILTER_FAILURE (t));
+
+ t = build2 (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t);
+ append_to_statement_list (body, &TREE_OPERAND (t, 0));
+
+ return t;
+}
+
/* Genericize an EH_SPEC_BLOCK by converting it to a
TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
{
tree body = EH_SPEC_STMTS (*stmt_p);
tree allowed = EH_SPEC_RAISES (*stmt_p);
- tree failure = build_call (call_unexpected_node,
- tree_cons (NULL_TREE, build_exc_ptr (),
- NULL_TREE));
- gimplify_stmt (&body);
+ tree failure = build_call_n (call_unexpected_node, 1, build_exc_ptr ());
- *stmt_p = gimple_build_eh_filter (body, allowed, failure);
+ *stmt_p = build_gimple_eh_filter_tree (body, allowed, failure);
}
/* Genericize an IF_STMT by turning it into a COND_EXPR. */
static void
gimplify_if_stmt (tree *stmt_p)
{
- tree stmt, then_, else_;
+ tree stmt, cond, then_, else_;
+ location_t locus = EXPR_LOCATION (*stmt_p);
stmt = *stmt_p;
+ cond = IF_COND (stmt);
then_ = THEN_CLAUSE (stmt);
else_ = ELSE_CLAUSE (stmt);
if (!else_)
else_ = build_empty_stmt ();
- stmt = build3 (COND_EXPR, void_type_node, IF_COND (stmt), then_, else_);
+ if (integer_nonzerop (cond) && !TREE_SIDE_EFFECTS (else_))
+ stmt = then_;
+ else if (integer_zerop (cond) && !TREE_SIDE_EFFECTS (then_))
+ stmt = else_;
+ else
+ stmt = build3 (COND_EXPR, void_type_node, cond, then_, else_);
+ if (CAN_HAVE_LOCATION_P (stmt) && !EXPR_HAS_LOCATION (stmt))
+ SET_EXPR_LOCATION (stmt, locus);
+ *stmt_p = stmt;
+}
+
+/* Build a generic representation of one of the C loop forms. COND is the
+ loop condition or NULL_TREE. BODY is the (possibly compound) statement
+ controlled by the loop. INCR is the increment expression of a for-loop,
+ or NULL_TREE. COND_IS_FIRST indicates whether the condition is
+ evaluated before the loop body as in while and for loops, or after the
+ loop body as in do-while loops. */
+
+static gimple_seq
+gimplify_cp_loop (tree cond, tree body, tree incr, bool cond_is_first)
+{
+ gimple top, entry, stmt;
+ gimple_seq stmt_list, body_seq, incr_seq, exit_seq;
+ tree cont_block, break_block;
+ location_t stmt_locus;
+
+ stmt_locus = input_location;
+ stmt_list = NULL;
+ body_seq = NULL;
+ incr_seq = NULL;
+ exit_seq = NULL;
+ entry = NULL;
+
+ break_block = begin_bc_block (bc_break);
+ cont_block = begin_bc_block (bc_continue);
+
+ /* If condition is zero don't generate a loop construct. */
+ if (cond && integer_zerop (cond))
+ {
+ top = NULL;
+ if (cond_is_first)
+ {
+ stmt = gimple_build_goto (get_bc_label (bc_break));
+ gimple_set_location (stmt, stmt_locus);
+ gimple_seq_add_stmt (&stmt_list, stmt);
+ }
+ }
+ else
+ {
+ /* If we use a LOOP_EXPR here, we have to feed the whole thing
+ back through the main gimplifier to lower it. Given that we
+ have to gimplify the loop body NOW so that we can resolve
+ break/continue stmts, seems easier to just expand to gotos. */
+ top = gimple_build_label (create_artificial_label ());
+
+ /* If we have an exit condition, then we build an IF with gotos either
+ out of the loop, or to the top of it. If there's no exit condition,
+ then we just build a jump back to the top. */
+ if (cond && !integer_nonzerop (cond))
+ {
+ if (cond != error_mark_node)
+ {
+ gimplify_expr (&cond, &exit_seq, NULL, is_gimple_val, fb_rvalue);
+ stmt = gimple_build_cond (NE_EXPR, cond,
+ build_int_cst (TREE_TYPE (cond), 0),
+ gimple_label_label (top),
+ get_bc_label (bc_break));
+ gimple_seq_add_stmt (&exit_seq, stmt);
+ }
+
+ if (cond_is_first)
+ {
+ if (incr)
+ {
+ entry = gimple_build_label (create_artificial_label ());
+ stmt = gimple_build_goto (gimple_label_label (entry));
+ }
+ else
+ stmt = gimple_build_goto (get_bc_label (bc_continue));
+ gimple_set_location (stmt, stmt_locus);
+ gimple_seq_add_stmt (&stmt_list, stmt);
+ }
+ }
+ else
+ {
+ stmt = gimple_build_goto (gimple_label_label (top));
+ gimple_seq_add_stmt (&exit_seq, stmt);
+ }
+ }
+
+ gimplify_stmt (&body, &body_seq);
+ gimplify_stmt (&incr, &incr_seq);
+
+ body_seq = finish_bc_block (bc_continue, cont_block, body_seq);
+
+ gimple_seq_add_stmt (&stmt_list, top);
+ gimple_seq_add_seq (&stmt_list, body_seq);
+ gimple_seq_add_seq (&stmt_list, incr_seq);
+ gimple_seq_add_stmt (&stmt_list, entry);
+ gimple_seq_add_seq (&stmt_list, exit_seq);
+
+ annotate_all_with_location (stmt_list, stmt_locus);
+
+ return finish_bc_block (bc_break, break_block, stmt_list);
+}
+
+/* Gimplify a FOR_STMT node. Move the stuff in the for-init-stmt into the
+ prequeue and hand off to gimplify_cp_loop. */
+
+static void
+gimplify_for_stmt (tree *stmt_p, gimple_seq *pre_p)
+{
+ tree stmt = *stmt_p;
+
+ if (FOR_INIT_STMT (stmt))
+ gimplify_and_add (FOR_INIT_STMT (stmt), pre_p);
+
+ gimple_seq_add_seq (pre_p,
+ gimplify_cp_loop (FOR_COND (stmt), FOR_BODY (stmt),
+ FOR_EXPR (stmt), 1));
+ *stmt_p = NULL_TREE;
+}
+
+/* Gimplify a WHILE_STMT node. */
+
+static void
+gimplify_while_stmt (tree *stmt_p, gimple_seq *pre_p)
+{
+ tree stmt = *stmt_p;
+ gimple_seq_add_seq (pre_p,
+ gimplify_cp_loop (WHILE_COND (stmt), WHILE_BODY (stmt),
+ NULL_TREE, 1));
+ *stmt_p = NULL_TREE;
+}
+
+/* Gimplify a DO_STMT node. */
+
+static void
+gimplify_do_stmt (tree *stmt_p, gimple_seq *pre_p)
+{
+ tree stmt = *stmt_p;
+ gimple_seq_add_seq (pre_p,
+ gimplify_cp_loop (DO_COND (stmt), DO_BODY (stmt),
+ NULL_TREE, 0));
+ *stmt_p = NULL_TREE;
+}
+
+/* Genericize a SWITCH_STMT by turning it into a SWITCH_EXPR. */
+
+static void
+gimplify_switch_stmt (tree *stmt_p, gimple_seq *pre_p)
+{
+ tree stmt = *stmt_p;
+ tree break_block, body, t;
+ location_t stmt_locus = input_location;
+ gimple_seq seq = NULL;
+
+ break_block = begin_bc_block (bc_break);
+
+ body = SWITCH_STMT_BODY (stmt);
+ if (!body)
+ body = build_empty_stmt ();
+
+ t = build3 (SWITCH_EXPR, SWITCH_STMT_TYPE (stmt),
+ SWITCH_STMT_COND (stmt), body, NULL_TREE);
+ SET_EXPR_LOCATION (t, stmt_locus);
+ gimplify_and_add (t, &seq);
+
+ seq = finish_bc_block (bc_break, break_block, seq);
+ gimple_seq_add_seq (pre_p, seq);
+ *stmt_p = NULL_TREE;
+}
+
+/* Hook into the middle of gimplifying an OMP_FOR node. This is required
+ in order to properly gimplify CONTINUE statements. Here we merely
+ manage the continue stack; the rest of the job is performed by the
+ regular gimplifier. */
+
+static enum gimplify_status
+cp_gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
+{
+ tree for_stmt = *expr_p;
+ tree cont_block;
+ gimple stmt;
+ gimple_seq seq = NULL;
+
+ /* Protect ourselves from recursion. */
+ if (OMP_FOR_GIMPLIFYING_P (for_stmt))
+ return GS_UNHANDLED;
+ OMP_FOR_GIMPLIFYING_P (for_stmt) = 1;
+
+ /* Note that while technically the continue label is enabled too soon
+ here, we should have already diagnosed invalid continues nested within
+ statement expressions within the INIT, COND, or INCR expressions. */
+ cont_block = begin_bc_block (bc_continue);
+
+ gimplify_and_add (for_stmt, &seq);
+ stmt = gimple_seq_last_stmt (seq);
+ if (gimple_code (stmt) == GIMPLE_OMP_FOR)
+ gimple_omp_set_body (stmt, finish_bc_block (bc_continue, cont_block,
+ gimple_omp_body (stmt)));
+ else
+ seq = finish_bc_block (bc_continue, cont_block, seq);
+ gimple_seq_add_seq (pre_p, seq);
+
+ OMP_FOR_GIMPLIFYING_P (for_stmt) = 0;
+
+ return GS_ALL_DONE;
+}
+
+/* Gimplify an EXPR_STMT node. */
+
+static void
+gimplify_expr_stmt (tree *stmt_p)
+{
+ tree stmt = EXPR_STMT_EXPR (*stmt_p);
+
+ if (stmt == error_mark_node)
+ stmt = NULL;
+
+ /* Gimplification of a statement expression will nullify the
+ statement if all its side effects are moved to *PRE_P and *POST_P.
+
+ In this case we will not want to emit the gimplified statement.
+ However, we may still want to emit a warning, so we do that before
+ gimplification. */
+ if (stmt && warn_unused_value)
+ {
+ if (!TREE_SIDE_EFFECTS (stmt))
+ {
+ if (!IS_EMPTY_STMT (stmt)
+ && !VOID_TYPE_P (TREE_TYPE (stmt))
+ && !TREE_NO_WARNING (stmt))
+ warning (OPT_Wunused_value, "statement with no effect");
+ }
+ else
+ warn_if_unused_value (stmt, input_location);
+ }
+
+ if (stmt == NULL_TREE)
+ stmt = alloc_stmt_list ();
+
*stmt_p = stmt;
}
/* Gimplify initialization from an AGGR_INIT_EXPR. */
static void
-cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
+cp_gimplify_init_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
tree from = TREE_OPERAND (*expr_p, 1);
tree to = TREE_OPERAND (*expr_p, 0);
- tree sub;
+ tree t;
+ tree slot = NULL_TREE;
- /* If we are initializing something from a TARGET_EXPR, strip the
- TARGET_EXPR and initialize it directly. */
/* What about code that pulls out the temp and uses it elsewhere? I
think that such code never uses the TARGET_EXPR as an initializer. If
I'm wrong, we'll abort because the temp won't have any RTL. In that
case, I guess we'll need to replace references somehow. */
if (TREE_CODE (from) == TARGET_EXPR)
- from = TARGET_EXPR_INITIAL (from);
- if (TREE_CODE (from) == CLEANUP_POINT_EXPR)
- from = TREE_OPERAND (from, 0);
+ {
+ slot = TARGET_EXPR_SLOT (from);
+ from = TARGET_EXPR_INITIAL (from);
+ }
- /* Look through any COMPOUND_EXPRs. */
- sub = expr_last (from);
+ /* Look through any COMPOUND_EXPRs, since build_compound_expr pushes them
+ inside the TARGET_EXPR. */
+ for (t = from; t; )
+ {
+ tree sub = TREE_CODE (t) == COMPOUND_EXPR ? TREE_OPERAND (t, 0) : t;
- /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
- replace the slot operand with our target.
+ /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
+ replace the slot operand with our target.
- Should we add a target parm to gimplify_expr instead? No, as in this
- case we want to replace the INIT_EXPR. */
- if (TREE_CODE (sub) == AGGR_INIT_EXPR)
- {
- gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
- TREE_OPERAND (sub, 2) = to;
- *expr_p = from;
-
- /* The initialization is now a side-effect, so the container can
- become void. */
- if (from != sub)
- TREE_TYPE (from) = void_type_node;
+ Should we add a target parm to gimplify_expr instead? No, as in this
+ case we want to replace the INIT_EXPR. */
+ if (TREE_CODE (sub) == AGGR_INIT_EXPR)
+ {
+ gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
+ AGGR_INIT_EXPR_SLOT (sub) = to;
+ *expr_p = from;
+
+ /* The initialization is now a side-effect, so the container can
+ become void. */
+ if (from != sub)
+ TREE_TYPE (from) = void_type_node;
+ }
+ else if (TREE_CODE (sub) == INIT_EXPR
+ && TREE_OPERAND (sub, 0) == slot)
+ {
+ /* An INIT_EXPR under TARGET_EXPR created by build_value_init,
+ will be followed by an AGGR_INIT_EXPR. */
+ gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
+ TREE_OPERAND (sub, 0) = to;
+ }
+
+ if (t == sub)
+ break;
+ else
+ t = TREE_OPERAND (t, 1);
}
+
}
/* Gimplify a MUST_NOT_THROW_EXPR. */
-static void
-gimplify_must_not_throw_expr (tree *expr_p, tree *pre_p)
+static enum gimplify_status
+gimplify_must_not_throw_expr (tree *expr_p, gimple_seq *pre_p)
{
tree stmt = *expr_p;
tree temp = voidify_wrapper_expr (stmt, NULL);
tree body = TREE_OPERAND (stmt, 0);
- gimplify_stmt (&body);
-
- stmt = gimple_build_eh_filter (body, NULL_TREE,
- build_call (terminate_node, NULL_TREE));
+ stmt = build_gimple_eh_filter_tree (body, NULL_TREE,
+ build_call_n (terminate_node, 0));
+ gimplify_and_add (stmt, pre_p);
if (temp)
{
- append_to_statement_list (stmt, pre_p);
*expr_p = temp;
+ return GS_OK;
}
- else
- *expr_p = stmt;
+
+ *expr_p = NULL;
+ return GS_ALL_DONE;
}
/* Do C++-specific gimplification. Args are as for gimplify_expr. */
int
-cp_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p)
+cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
int saved_stmts_are_full_exprs_p = 0;
enum tree_code code = TREE_CODE (*expr_p);
break;
case THROW_EXPR:
- /* FIXME communicate throw type to backend, probably by moving
+ /* FIXME communicate throw type to back end, probably by moving
THROW_EXPR into ../tree.def. */
*expr_p = TREE_OPERAND (*expr_p, 0);
ret = GS_OK;
break;
case MUST_NOT_THROW_EXPR:
- gimplify_must_not_throw_expr (expr_p, pre_p);
- ret = GS_OK;
+ ret = gimplify_must_not_throw_expr (expr_p, pre_p);
break;
+ /* We used to do this for MODIFY_EXPR as well, but that's unsafe; the
+ LHS of an assignment might also be involved in the RHS, as in bug
+ 25979. */
case INIT_EXPR:
- case MODIFY_EXPR:
cp_gimplify_init_expr (expr_p, pre_p, post_p);
ret = GS_OK;
break;
case EMPTY_CLASS_EXPR:
- /* We create an INTEGER_CST with RECORD_TYPE and value zero. */
- *expr_p = build_int_cst (TREE_TYPE (*expr_p), 0);
+ /* We create an empty CONSTRUCTOR with RECORD_TYPE. */
+ *expr_p = build_constructor (TREE_TYPE (*expr_p), NULL);
ret = GS_OK;
break;
case USING_STMT:
/* Just ignore for now. Eventually we will want to pass this on to
the debugger. */
- *expr_p = build_empty_stmt ();
+ *expr_p = NULL;
ret = GS_ALL_DONE;
break;
ret = GS_OK;
break;
+ case FOR_STMT:
+ gimplify_for_stmt (expr_p, pre_p);
+ ret = GS_OK;
+ break;
+
+ case WHILE_STMT:
+ gimplify_while_stmt (expr_p, pre_p);
+ ret = GS_OK;
+ break;
+
+ case DO_STMT:
+ gimplify_do_stmt (expr_p, pre_p);
+ ret = GS_OK;
+ break;
+
+ case SWITCH_STMT:
+ gimplify_switch_stmt (expr_p, pre_p);
+ ret = GS_OK;
+ break;
+
+ case OMP_FOR:
+ ret = cp_gimplify_omp_for (expr_p, pre_p);
+ break;
+
+ case CONTINUE_STMT:
+ gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_continue)));
+ *expr_p = NULL_TREE;
+ ret = GS_ALL_DONE;
+ break;
+
+ case BREAK_STMT:
+ gimple_seq_add_stmt (pre_p, gimple_build_goto (get_bc_label (bc_break)));
+ *expr_p = NULL_TREE;
+ ret = GS_ALL_DONE;
+ break;
+
+ case EXPR_STMT:
+ gimplify_expr_stmt (expr_p);
+ ret = GS_OK;
+ break;
+
+ case UNARY_PLUS_EXPR:
+ {
+ tree arg = TREE_OPERAND (*expr_p, 0);
+ tree type = TREE_TYPE (*expr_p);
+ *expr_p = (TREE_TYPE (arg) != type) ? fold_convert (type, arg)
+ : arg;
+ ret = GS_OK;
+ }
+ break;
+
default:
ret = c_gimplify_expr (expr_p, pre_p, post_p);
break;
}
static inline bool
-is_invisiref_parm (tree t)
+is_invisiref_parm (const_tree t)
{
return ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL)
&& DECL_BY_REFERENCE (t));
}
+/* Return true if the uid in both int tree maps are equal. */
+
+int
+cxx_int_tree_map_eq (const void *va, const void *vb)
+{
+ const struct cxx_int_tree_map *a = (const struct cxx_int_tree_map *) va;
+ const struct cxx_int_tree_map *b = (const struct cxx_int_tree_map *) vb;
+ return (a->uid == b->uid);
+}
+
+/* Hash a UID in a cxx_int_tree_map. */
+
+unsigned int
+cxx_int_tree_map_hash (const void *item)
+{
+ return ((const struct cxx_int_tree_map *)item)->uid;
+}
+
/* Perform any pre-gimplification lowering of C++ front end trees to
GENERIC. */
cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
- htab_t htab = (htab_t) data;
- void **slot;
+ struct pointer_set_t *p_set = (struct pointer_set_t*) data;
- if (is_invisiref_parm (stmt))
+ if (is_invisiref_parm (stmt)
+ /* Don't dereference parms in a thunk, pass the references through. */
+ && !(DECL_THUNK_P (current_function_decl)
+ && TREE_CODE (stmt) == PARM_DECL))
{
*stmt_p = convert_from_reference (stmt);
*walk_subtrees = 0;
return NULL;
}
+ /* Map block scope extern declarations to visible declarations with the
+ same name and type in outer scopes if any. */
+ if (cp_function_chain->extern_decl_map
+ && (TREE_CODE (stmt) == FUNCTION_DECL || TREE_CODE (stmt) == VAR_DECL)
+ && DECL_EXTERNAL (stmt))
+ {
+ struct cxx_int_tree_map *h, in;
+ in.uid = DECL_UID (stmt);
+ h = (struct cxx_int_tree_map *)
+ htab_find_with_hash (cp_function_chain->extern_decl_map,
+ &in, in.uid);
+ if (h)
+ {
+ *stmt_p = h->to;
+ *walk_subtrees = 0;
+ return NULL;
+ }
+ }
+
/* Other than invisiref parms, don't walk the same tree twice. */
- slot = htab_find_slot (htab, stmt, INSERT);
- if (*slot)
+ if (pointer_set_contains (p_set, stmt))
{
*walk_subtrees = 0;
return NULL_TREE;
&& is_invisiref_parm (TREE_OPERAND (stmt, 0)))
/* Don't dereference an invisiref RESULT_DECL inside a RETURN_EXPR. */
*walk_subtrees = 0;
- else if (DECL_P (stmt) || TYPE_P (stmt))
+ else if (TREE_CODE (stmt) == OMP_CLAUSE)
+ switch (OMP_CLAUSE_CODE (stmt))
+ {
+ case OMP_CLAUSE_LASTPRIVATE:
+ /* Don't dereference an invisiref in OpenMP clauses. */
+ if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
+ {
+ *walk_subtrees = 0;
+ if (OMP_CLAUSE_LASTPRIVATE_STMT (stmt))
+ cp_walk_tree (&OMP_CLAUSE_LASTPRIVATE_STMT (stmt),
+ cp_genericize_r, p_set, NULL);
+ }
+ break;
+ case OMP_CLAUSE_PRIVATE:
+ case OMP_CLAUSE_SHARED:
+ case OMP_CLAUSE_FIRSTPRIVATE:
+ case OMP_CLAUSE_COPYIN:
+ case OMP_CLAUSE_COPYPRIVATE:
+ /* Don't dereference an invisiref in OpenMP clauses. */
+ if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
+ *walk_subtrees = 0;
+ break;
+ case OMP_CLAUSE_REDUCTION:
+ gcc_assert (!is_invisiref_parm (OMP_CLAUSE_DECL (stmt)));
+ break;
+ default:
+ break;
+ }
+ else if (IS_TYPE_OR_DECL_P (stmt))
*walk_subtrees = 0;
/* Due to the way voidify_wrapper_expr is written, we don't get a chance
CLEANUP_BODY (stmt),
CLEANUP_EXPR (stmt));
- *slot = *stmt_p;
+ pointer_set_insert (p_set, *stmt_p);
+
return NULL;
}
cp_genericize (tree fndecl)
{
tree t;
- htab_t htab;
+ struct pointer_set_t *p_set;
/* Fix up the types of parms passed by invisible reference. */
for (t = DECL_ARGUMENTS (fndecl); t; t = TREE_CHAIN (t))
- {
- if (DECL_BY_REFERENCE (t))
- abort ();
- if (TREE_ADDRESSABLE (TREE_TYPE (t)))
- {
- if (DECL_ARG_TYPE (t) == TREE_TYPE (t))
- abort ();
- TREE_TYPE (t) = DECL_ARG_TYPE (t);
- DECL_BY_REFERENCE (t) = 1;
- TREE_ADDRESSABLE (t) = 0;
- relayout_decl (t);
- }
- }
+ if (TREE_ADDRESSABLE (TREE_TYPE (t)))
+ {
+ /* If a function's arguments are copied to create a thunk,
+ then DECL_BY_REFERENCE will be set -- but the type of the
+ argument will be a pointer type, so we will never get
+ here. */
+ gcc_assert (!DECL_BY_REFERENCE (t));
+ gcc_assert (DECL_ARG_TYPE (t) != TREE_TYPE (t));
+ TREE_TYPE (t) = DECL_ARG_TYPE (t);
+ DECL_BY_REFERENCE (t) = 1;
+ TREE_ADDRESSABLE (t) = 0;
+ relayout_decl (t);
+ }
/* Do the same for the return value. */
if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (fndecl))))
/* We do want to see every occurrence of the parms, so we can't just use
walk_tree's hash functionality. */
- htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
- walk_tree (&DECL_SAVED_TREE (fndecl), cp_genericize_r, htab, NULL);
- htab_delete (htab);
+ p_set = pointer_set_create ();
+ cp_walk_tree (&DECL_SAVED_TREE (fndecl), cp_genericize_r, p_set, NULL);
+ pointer_set_destroy (p_set);
/* Do everything else. */
c_genericize (fndecl);
+
+ gcc_assert (bc_label[bc_break] == NULL);
+ gcc_assert (bc_label[bc_continue] == NULL);
+}
+\f
+/* Build code to apply FN to each member of ARG1 and ARG2. FN may be
+ NULL if there is in fact nothing to do. ARG2 may be null if FN
+ actually only takes one argument. */
+
+static tree
+cxx_omp_clause_apply_fn (tree fn, tree arg1, tree arg2)
+{
+ tree defparm, parm, t;
+ int i = 0;
+ int nargs;
+ tree *argarray;
+
+ if (fn == NULL)
+ return NULL;
+
+ nargs = list_length (DECL_ARGUMENTS (fn));
+ argarray = (tree *) alloca (nargs * sizeof (tree));
+
+ defparm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
+ if (arg2)
+ defparm = TREE_CHAIN (defparm);
+
+ if (TREE_CODE (TREE_TYPE (arg1)) == ARRAY_TYPE)
+ {
+ tree inner_type = TREE_TYPE (arg1);
+ tree start1, end1, p1;
+ tree start2 = NULL, p2 = NULL;
+ tree ret = NULL, lab;
+
+ start1 = arg1;
+ start2 = arg2;
+ do
+ {
+ inner_type = TREE_TYPE (inner_type);
+ start1 = build4 (ARRAY_REF, inner_type, start1,
+ size_zero_node, NULL, NULL);
+ if (arg2)
+ start2 = build4 (ARRAY_REF, inner_type, start2,
+ size_zero_node, NULL, NULL);
+ }
+ while (TREE_CODE (inner_type) == ARRAY_TYPE);
+ start1 = build_fold_addr_expr (start1);
+ if (arg2)
+ start2 = build_fold_addr_expr (start2);
+
+ end1 = TYPE_SIZE_UNIT (TREE_TYPE (arg1));
+ end1 = build2 (POINTER_PLUS_EXPR, TREE_TYPE (start1), start1, end1);
+
+ p1 = create_tmp_var (TREE_TYPE (start1), NULL);
+ t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, start1);
+ append_to_statement_list (t, &ret);
+
+ if (arg2)
+ {
+ p2 = create_tmp_var (TREE_TYPE (start2), NULL);
+ t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, start2);
+ append_to_statement_list (t, &ret);
+ }
+
+ lab = create_artificial_label ();
+ t = build1 (LABEL_EXPR, void_type_node, lab);
+ append_to_statement_list (t, &ret);
+
+ argarray[i++] = p1;
+ if (arg2)
+ argarray[i++] = p2;
+ /* Handle default arguments. */
+ for (parm = defparm; parm && parm != void_list_node;
+ parm = TREE_CHAIN (parm), i++)
+ argarray[i] = convert_default_arg (TREE_VALUE (parm),
+ TREE_PURPOSE (parm), fn, i);
+ t = build_call_a (fn, i, argarray);
+ t = fold_convert (void_type_node, t);
+ t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
+ append_to_statement_list (t, &ret);
+
+ t = TYPE_SIZE_UNIT (inner_type);
+ t = build2 (POINTER_PLUS_EXPR, TREE_TYPE (p1), p1, t);
+ t = build2 (MODIFY_EXPR, TREE_TYPE (p1), p1, t);
+ append_to_statement_list (t, &ret);
+
+ if (arg2)
+ {
+ t = TYPE_SIZE_UNIT (inner_type);
+ t = build2 (POINTER_PLUS_EXPR, TREE_TYPE (p2), p2, t);
+ t = build2 (MODIFY_EXPR, TREE_TYPE (p2), p2, t);
+ append_to_statement_list (t, &ret);
+ }
+
+ t = build2 (NE_EXPR, boolean_type_node, p1, end1);
+ t = build3 (COND_EXPR, void_type_node, t, build_and_jump (&lab), NULL);
+ append_to_statement_list (t, &ret);
+
+ return ret;
+ }
+ else
+ {
+ argarray[i++] = build_fold_addr_expr (arg1);
+ if (arg2)
+ argarray[i++] = build_fold_addr_expr (arg2);
+ /* Handle default arguments. */
+ for (parm = defparm; parm && parm != void_list_node;
+ parm = TREE_CHAIN (parm), i++)
+ argarray[i] = convert_default_arg (TREE_VALUE (parm),
+ TREE_PURPOSE (parm),
+ fn, i);
+ t = build_call_a (fn, i, argarray);
+ t = fold_convert (void_type_node, t);
+ return fold_build_cleanup_point_expr (TREE_TYPE (t), t);
+ }
+}
+
+/* Return code to initialize DECL with its default constructor, or
+ NULL if there's nothing to do. */
+
+tree
+cxx_omp_clause_default_ctor (tree clause, tree decl,
+ tree outer ATTRIBUTE_UNUSED)
+{
+ tree info = CP_OMP_CLAUSE_INFO (clause);
+ tree ret = NULL;
+
+ if (info)
+ ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), decl, NULL);
+
+ return ret;
+}
+
+/* Return code to initialize DST with a copy constructor from SRC. */
+
+tree
+cxx_omp_clause_copy_ctor (tree clause, tree dst, tree src)
+{
+ tree info = CP_OMP_CLAUSE_INFO (clause);
+ tree ret = NULL;
+
+ if (info)
+ ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 0), dst, src);
+ if (ret == NULL)
+ ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
+
+ return ret;
+}
+
+/* Similarly, except use an assignment operator instead. */
+
+tree
+cxx_omp_clause_assign_op (tree clause, tree dst, tree src)
+{
+ tree info = CP_OMP_CLAUSE_INFO (clause);
+ tree ret = NULL;
+
+ if (info)
+ ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 2), dst, src);
+ if (ret == NULL)
+ ret = build2 (MODIFY_EXPR, TREE_TYPE (dst), dst, src);
+
+ return ret;
+}
+
+/* Return code to destroy DECL. */
+
+tree
+cxx_omp_clause_dtor (tree clause, tree decl)
+{
+ tree info = CP_OMP_CLAUSE_INFO (clause);
+ tree ret = NULL;
+
+ if (info)
+ ret = cxx_omp_clause_apply_fn (TREE_VEC_ELT (info, 1), decl, NULL);
+
+ return ret;
+}
+
+/* True if OpenMP should privatize what this DECL points to rather
+ than the DECL itself. */
+
+bool
+cxx_omp_privatize_by_reference (const_tree decl)
+{
+ return is_invisiref_parm (decl);
+}
+
+/* True if OpenMP sharing attribute of DECL is predetermined. */
+
+enum omp_clause_default_kind
+cxx_omp_predetermined_sharing (tree decl)
+{
+ tree type;
+
+ /* Static data members are predetermined as shared. */
+ if (TREE_STATIC (decl))
+ {
+ tree ctx = CP_DECL_CONTEXT (decl);
+ if (TYPE_P (ctx) && MAYBE_CLASS_TYPE_P (ctx))
+ return OMP_CLAUSE_DEFAULT_SHARED;
+ }
+
+ type = TREE_TYPE (decl);
+ if (TREE_CODE (type) == REFERENCE_TYPE)
+ {
+ if (!is_invisiref_parm (decl))
+ return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
+ type = TREE_TYPE (type);
+
+ if (TREE_CODE (decl) == RESULT_DECL && DECL_NAME (decl))
+ {
+ /* NVR doesn't preserve const qualification of the
+ variable's type. */
+ tree outer = outer_curly_brace_block (current_function_decl);
+ tree var;
+
+ if (outer)
+ for (var = BLOCK_VARS (outer); var; var = TREE_CHAIN (var))
+ if (DECL_NAME (decl) == DECL_NAME (var)
+ && (TYPE_MAIN_VARIANT (type)
+ == TYPE_MAIN_VARIANT (TREE_TYPE (var))))
+ {
+ if (TYPE_READONLY (TREE_TYPE (var)))
+ type = TREE_TYPE (var);
+ break;
+ }
+ }
+ }
+
+ if (type == error_mark_node)
+ return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
+
+ /* Variables with const-qualified type having no mutable member
+ are predetermined shared. */
+ if (TYPE_READONLY (type) && !cp_has_mutable_p (type))
+ return OMP_CLAUSE_DEFAULT_SHARED;
+
+ return OMP_CLAUSE_DEFAULT_UNSPECIFIED;
+}
+
+/* Finalize an implicitly determined clause. */
+
+void
+cxx_omp_finish_clause (tree c)
+{
+ tree decl, inner_type;
+ bool make_shared = false;
+
+ if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_FIRSTPRIVATE)
+ return;
+
+ decl = OMP_CLAUSE_DECL (c);
+ decl = require_complete_type (decl);
+ inner_type = TREE_TYPE (decl);
+ if (decl == error_mark_node)
+ make_shared = true;
+ else if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE)
+ {
+ if (is_invisiref_parm (decl))
+ inner_type = TREE_TYPE (inner_type);
+ else
+ {
+ error ("%qE implicitly determined as %<firstprivate%> has reference type",
+ decl);
+ make_shared = true;
+ }
+ }
+
+ /* We're interested in the base element, not arrays. */
+ while (TREE_CODE (inner_type) == ARRAY_TYPE)
+ inner_type = TREE_TYPE (inner_type);
+
+ /* Check for special function availability by building a call to one.
+ Save the results, because later we won't be in the right context
+ for making these queries. */
+ if (!make_shared
+ && CLASS_TYPE_P (inner_type)
+ && cxx_omp_create_clause_info (c, inner_type, false, true, false))
+ make_shared = true;
+
+ if (make_shared)
+ OMP_CLAUSE_CODE (c) = OMP_CLAUSE_SHARED;
}
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