1 /* C++-specific tree lowering bits; see also c-gimplify.c and tree-gimple.c.
3 Copyright (C) 2002, 2003 Free Software Foundation, Inc.
4 Contributed by Jason Merrill <jason@redhat.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 #include "coretypes.h"
31 #include "tree-gimple.h"
34 /* Genericize a TRY_BLOCK. */
37 genericize_try_block (tree *stmt_p)
39 tree body = TRY_STMTS (*stmt_p);
40 tree cleanup = TRY_HANDLERS (*stmt_p);
42 gimplify_stmt (&body);
44 if (CLEANUP_P (*stmt_p))
45 /* A cleanup is an expression, so it doesn't need to be genericized. */;
47 gimplify_stmt (&cleanup);
49 *stmt_p = build (TRY_CATCH_EXPR, void_type_node, body, cleanup);
52 /* Genericize a HANDLER by converting to a CATCH_EXPR. */
55 genericize_catch_block (tree *stmt_p)
57 tree type = HANDLER_TYPE (*stmt_p);
58 tree body = HANDLER_BODY (*stmt_p);
60 gimplify_stmt (&body);
62 /* FIXME should the caught type go in TREE_TYPE? */
63 *stmt_p = build (CATCH_EXPR, void_type_node, type, body);
66 /* Genericize an EH_SPEC_BLOCK by converting it to a
67 TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
70 genericize_eh_spec_block (tree *stmt_p)
72 tree body = EH_SPEC_STMTS (*stmt_p);
73 tree allowed = EH_SPEC_RAISES (*stmt_p);
74 tree failure = build_call (call_unexpected_node,
75 tree_cons (NULL_TREE, build_exc_ptr (),
77 gimplify_stmt (&body);
79 *stmt_p = gimple_build_eh_filter (body, allowed, failure);
82 /* Gimplify initialization from an AGGR_INIT_EXPR. */
85 cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
87 tree from = TREE_OPERAND (*expr_p, 1);
88 tree to = TREE_OPERAND (*expr_p, 0);
91 /* If we are initializing something from a TARGET_EXPR, strip the
92 TARGET_EXPR and initialize it directly. */
93 /* What about code that pulls out the temp and uses it elsewhere? I
94 think that such code never uses the TARGET_EXPR as an initializer. If
95 I'm wrong, we'll abort because the temp won't have any RTL. In that
96 case, I guess we'll need to replace references somehow. */
97 if (TREE_CODE (from) == TARGET_EXPR)
98 from = TARGET_EXPR_INITIAL (from);
100 /* Look through any COMPOUND_EXPRs. */
101 sub = expr_last (from);
103 /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
104 replace the slot operand with our target.
106 Should we add a target parm to gimplify_expr instead? No, as in this
107 case we want to replace the INIT_EXPR. */
108 if (TREE_CODE (sub) == AGGR_INIT_EXPR)
110 gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
111 TREE_OPERAND (sub, 2) = to;
114 /* The initialization is now a side-effect, so the container can
117 TREE_TYPE (from) = void_type_node;
121 /* Gimplify a MUST_NOT_THROW_EXPR. */
124 gimplify_must_not_throw_expr (tree *expr_p, tree *pre_p)
127 tree temp = voidify_wrapper_expr (stmt, NULL);
128 tree body = TREE_OPERAND (stmt, 0);
130 gimplify_stmt (&body);
132 stmt = gimple_build_eh_filter (body, NULL_TREE,
133 build_call (terminate_node, NULL_TREE));
137 append_to_statement_list (stmt, pre_p);
144 /* Do C++-specific gimplification. Args are as for gimplify_expr. */
147 cp_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p)
149 int saved_stmts_are_full_exprs_p = 0;
150 enum tree_code code = TREE_CODE (*expr_p);
151 enum gimplify_status ret;
153 if (STATEMENT_CODE_P (code))
155 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
156 current_stmt_tree ()->stmts_are_full_exprs_p
157 = STMT_IS_FULL_EXPR_P (*expr_p);
163 *expr_p = cplus_expand_constant (*expr_p);
168 simplify_aggr_init_expr (expr_p);
173 /* FIXME communicate throw type to backend, probably by moving
174 THROW_EXPR into ../tree.def. */
175 *expr_p = TREE_OPERAND (*expr_p, 0);
179 case MUST_NOT_THROW_EXPR:
180 gimplify_must_not_throw_expr (expr_p, pre_p);
186 cp_gimplify_init_expr (expr_p, pre_p, post_p);
190 case EMPTY_CLASS_EXPR:
192 /* Yes, an INTEGER_CST with RECORD_TYPE. */
193 tree i = build_int_2 (0, 0);
194 TREE_TYPE (i) = TREE_TYPE (*expr_p);
201 *expr_p = BASELINK_FUNCTIONS (*expr_p);
206 genericize_try_block (expr_p);
211 genericize_catch_block (expr_p);
216 genericize_eh_spec_block (expr_p);
221 /* Just ignore for now. Eventually we will want to pass this on to
223 *expr_p = build_empty_stmt ();
228 ret = c_gimplify_expr (expr_p, pre_p, post_p);
232 /* Restore saved state. */
233 if (STATEMENT_CODE_P (code))
234 current_stmt_tree ()->stmts_are_full_exprs_p
235 = saved_stmts_are_full_exprs_p;