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"
33 static void genericize_try_block (tree *);
34 static void genericize_catch_block (tree *);
35 static void genericize_eh_spec_block (tree *);
36 static void gimplify_must_not_throw_expr (tree *, tree *);
37 static void cp_gimplify_init_expr (tree *, tree *, tree *);
39 /* Genericize a C++ _STMT. Called from c_gimplify_stmt. */
42 cp_gimplify_stmt (tree *stmt_p, tree *next_p ATTRIBUTE_UNUSED)
45 switch (TREE_CODE (stmt))
48 genericize_try_block (stmt_p);
52 genericize_catch_block (stmt_p);
56 genericize_eh_spec_block (stmt_p);
60 /* Just ignore for now. Eventually we will want to pass this on to
62 *stmt_p = build_empty_stmt ();
71 /* Genericize a TRY_BLOCK. */
74 genericize_try_block (tree *stmt_p)
76 tree body = TRY_STMTS (*stmt_p);
77 tree cleanup = TRY_HANDLERS (*stmt_p);
79 c_gimplify_stmt (&body);
81 if (CLEANUP_P (*stmt_p))
82 /* A cleanup is an expression, so it doesn't need to be genericized. */;
84 c_gimplify_stmt (&cleanup);
86 *stmt_p = build (TRY_CATCH_EXPR, void_type_node, body, cleanup);
89 /* Genericize a HANDLER by converting to a CATCH_EXPR. */
92 genericize_catch_block (tree *stmt_p)
94 tree type = HANDLER_TYPE (*stmt_p);
95 tree body = HANDLER_BODY (*stmt_p);
97 c_gimplify_stmt (&body);
99 /* FIXME should the caught type go in TREE_TYPE? */
100 *stmt_p = build (CATCH_EXPR, void_type_node, type, body);
103 /* Genericize an EH_SPEC_BLOCK by converting it to a
104 TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
107 genericize_eh_spec_block (tree *stmt_p)
109 tree body = EH_SPEC_STMTS (*stmt_p);
110 tree allowed = EH_SPEC_RAISES (*stmt_p);
111 tree failure = build_call (call_unexpected_node,
112 tree_cons (NULL_TREE, build_exc_ptr (),
114 c_gimplify_stmt (&body);
116 *stmt_p = gimple_build_eh_filter (body, allowed, failure);
119 /* Do C++-specific gimplification. Args are as for gimplify_expr. */
122 cp_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p)
124 switch (TREE_CODE (*expr_p))
127 *expr_p = cplus_expand_constant (*expr_p);
131 simplify_aggr_init_expr (expr_p);
135 /* FIXME communicate throw type to backend, probably by moving
136 THROW_EXPR into ../tree.def. */
137 *expr_p = TREE_OPERAND (*expr_p, 0);
140 case MUST_NOT_THROW_EXPR:
141 gimplify_must_not_throw_expr (expr_p, pre_p);
146 cp_gimplify_init_expr (expr_p, pre_p, post_p);
149 case EMPTY_CLASS_EXPR:
151 /* Yes, an INTEGER_CST with RECORD_TYPE. */
152 tree i = build_int_2 (0, 0);
153 TREE_TYPE (i) = TREE_TYPE (*expr_p);
159 *expr_p = BASELINK_FUNCTIONS (*expr_p);
163 return c_gimplify_expr (expr_p, pre_p, post_p);
167 /* Gimplify initialization from an AGGR_INIT_EXPR. */
170 cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
172 tree from = TREE_OPERAND (*expr_p, 1);
173 tree to = TREE_OPERAND (*expr_p, 0);
176 /* If we are initializing something from a TARGET_EXPR, strip the
177 TARGET_EXPR and initialize it directly. */
178 /* What about code that pulls out the temp and uses it elsewhere? I
179 think that such code never uses the TARGET_EXPR as an initializer. If
180 I'm wrong, we'll abort because the temp won't have any RTL. In that
181 case, I guess we'll need to replace references somehow. */
182 if (TREE_CODE (from) == TARGET_EXPR)
183 from = TARGET_EXPR_INITIAL (from);
187 /* If we are initializing from a STMT_EXPR, extract the returned
189 if (TREE_CODE (from) == STMT_EXPR)
190 sub = EXPR_STMT_EXPR (stmt_expr_last_stmt (from));
192 /* Look through any COMPOUND_EXPRs. */
193 while (TREE_CODE (sub) == COMPOUND_EXPR)
194 sub = TREE_OPERAND (sub, 1);
196 /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
197 replace the slot operand with our target.
199 Should we add a target parm to gimplify_expr instead? No, as in this
200 case we want to replace the INIT_EXPR. */
201 if (TREE_CODE (sub) == AGGR_INIT_EXPR)
203 gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
204 TREE_OPERAND (sub, 2) = to;
207 /* The initialization is now a side-effect, so the container can
208 become void. This is important for a STMT_EXPR, so we don't try
209 to voidify it later by creating a temporary. */
211 TREE_TYPE (from) = void_type_node;
215 /* Gimplify a MUST_NOT_THROW_EXPR. */
218 gimplify_must_not_throw_expr (tree *expr_p, tree *pre_p)
221 tree temp = voidify_wrapper_expr (stmt);
222 tree body = TREE_OPERAND (stmt, 0);
224 gimplify_stmt (&body);
226 stmt = gimple_build_eh_filter (body, NULL_TREE,
227 build_call (terminate_node, NULL_TREE));
231 append_to_statement_list (stmt, pre_p);