1 /* Java(TM) language-specific gimplification routines.
2 Copyright (C) 2003-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>.
20 Java and all Java-based marks are trademarks or registered trademarks
21 of Sun Microsystems, Inc. in the United States and other countries.
22 The Free Software Foundation is independent of Sun Microsystems, Inc. */
26 #include "coretypes.h"
28 #include "java-tree.h"
32 static tree java_gimplify_block (tree);
33 static enum gimplify_status java_gimplify_modify_expr (tree *);
34 static enum gimplify_status java_gimplify_self_mod_expr (tree *, gimple_seq *,
37 static void dump_java_tree (enum tree_dump_index, tree);
39 /* Convert a Java tree to GENERIC. */
42 java_genericize (tree fndecl)
44 walk_tree (&DECL_SAVED_TREE (fndecl), java_replace_references, NULL, NULL);
45 dump_java_tree (TDI_original, fndecl);
48 /* Gimplify a Java tree. */
51 java_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
53 enum tree_code code = TREE_CODE (*expr_p);
58 *expr_p = java_gimplify_block (*expr_p);
62 return java_gimplify_modify_expr (expr_p);
64 case POSTINCREMENT_EXPR:
65 case POSTDECREMENT_EXPR:
66 case PREINCREMENT_EXPR:
67 case PREDECREMENT_EXPR:
68 return java_gimplify_self_mod_expr (expr_p, pre_p, post_p);
70 /* These should already be lowered before we get here. */
84 static enum gimplify_status
85 java_gimplify_modify_expr (tree *modify_expr_p)
87 tree modify_expr = *modify_expr_p;
88 tree lhs = TREE_OPERAND (modify_expr, 0);
89 tree rhs = TREE_OPERAND (modify_expr, 1);
90 tree lhs_type = TREE_TYPE (lhs);
92 if (lhs_type != TREE_TYPE (rhs))
93 /* Fix up type mismatches to make legal GIMPLE. These are
94 generated in several places, in particular null pointer
95 assignment and subclass assignment. */
96 TREE_OPERAND (modify_expr, 1) = convert (lhs_type, rhs);
101 /* Special case handling for volatiles: we need to generate a barrier
102 between the reading and the writing. */
104 static enum gimplify_status
105 java_gimplify_self_mod_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED,
106 gimple_seq *post_p ATTRIBUTE_UNUSED)
108 tree lhs = TREE_OPERAND (*expr_p, 0);
110 if (TREE_CODE (lhs) == COMPONENT_REF
111 && TREE_THIS_VOLATILE (TREE_OPERAND (lhs, 1)))
112 TREE_THIS_VOLATILE (lhs) = 1;
118 /* Gimplify BLOCK into a BIND_EXPR. */
121 java_gimplify_block (tree java_block)
123 tree decls = BLOCK_VARS (java_block);
124 tree body = BLOCK_EXPR_BODY (java_block);
125 gimple outer = gimple_current_bind_expr ();
128 /* Don't bother with empty blocks. */
130 return build_empty_stmt (input_location);
132 if (IS_EMPTY_STMT (body))
135 /* Make a proper block. Java blocks are unsuitable for BIND_EXPR
136 because they use BLOCK_SUBBLOCKS for another purpose. */
137 block = make_node (BLOCK);
138 BLOCK_VARS (block) = decls;
140 /* The TREE_USED flag on a block determines whether the debug output
141 routines generate info for the variables in that block. */
142 TREE_USED (block) = 1;
146 tree b = gimple_bind_block (outer);
147 BLOCK_SUBBLOCKS (b) = chainon (BLOCK_SUBBLOCKS (b), block);
149 BLOCK_EXPR_BODY (java_block) = NULL_TREE;
151 return build3 (BIND_EXPR, TREE_TYPE (java_block), decls, body, block);
154 /* Dump a tree of some kind. This is a convenience wrapper for the
155 dump_* functions in tree-dump.c. */
157 dump_java_tree (enum tree_dump_index phase, tree t)
162 stream = dump_begin (phase, &flags);
166 dump_node (t, flags, stream);
167 dump_end (phase, stream);