1 /* Java(TM) language-specific gimplification routines.
2 Copyright (C) 2003, 2004 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 2, 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 COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA.
21 Java and all Java-based marks are trademarks or registered trademarks
22 of Sun Microsystems, Inc. in the United States and other countries.
23 The Free Software Foundation is independent of Sun Microsystems, Inc. */
27 #include "coretypes.h"
30 #include "java-tree.h"
31 #include "tree-dump.h"
32 #include "tree-gimple.h"
35 static tree java_gimplify_case_expr (tree);
36 static tree java_gimplify_default_expr (tree);
37 static tree java_gimplify_block (tree);
38 static tree java_gimplify_new_array_init (tree);
39 static tree java_gimplify_try_expr (tree);
40 static tree java_gimplify_modify_expr (tree);
42 static void dump_java_tree (enum tree_dump_index, tree);
44 /* Convert a Java tree to GENERIC. */
47 java_genericize (tree fndecl)
49 dump_java_tree (TDI_original, fndecl);
51 /* Genericize with the gimplifier. */
52 gimplify_function_tree (fndecl);
54 dump_function (TDI_generic, fndecl);
57 /* Gimplify a Java tree. */
60 java_gimplify_expr (tree *expr_p, tree *pre_p ATTRIBUTE_UNUSED,
61 tree *post_p ATTRIBUTE_UNUSED)
63 char code_class = TREE_CODE_CLASS(TREE_CODE (*expr_p));
65 /* Java insists on strict left-to-right evaluation of expressions.
66 A problem may arise if a variable used in the LHS of a binary
67 operation is altered by an assignment to that value in the RHS
68 before we've performed the operation. So, we always copy every
69 LHS to a temporary variable.
71 FIXME: Are there any other cases where we should do this?
72 Parameter lists, maybe? Or perhaps that's unnecessary because
73 the front end already generates SAVE_EXPRs. */
74 if (code_class == '2')
76 tree lhs = TREE_OPERAND (*expr_p, 0);
77 enum gimplify_status stat
78 = gimplify_expr (&lhs, pre_p, post_p, is_gimple_tmp_var, fb_rvalue);
81 TREE_OPERAND (*expr_p, 0) = lhs;
84 switch (TREE_CODE (*expr_p))
87 *expr_p = java_gimplify_block (*expr_p);
90 case EXPR_WITH_FILE_LOCATION:
91 input_location.file = EXPR_WFL_FILENAME (*expr_p);
92 input_location.line = EXPR_WFL_LINENO (*expr_p);
93 *expr_p = EXPR_WFL_NODE (*expr_p);
94 annotate_with_locus (*expr_p, input_location);
98 *expr_p = java_gimplify_case_expr (*expr_p);
102 *expr_p = java_gimplify_default_expr (*expr_p);
106 *expr_p = java_gimplify_new_array_init (*expr_p);
110 *expr_p = java_gimplify_try_expr (*expr_p);
113 case JAVA_CATCH_EXPR:
114 *expr_p = TREE_OPERAND (*expr_p, 0);
117 case JAVA_EXC_OBJ_EXPR:
118 *expr_p = build_exception_object_ref (TREE_TYPE (*expr_p));
122 *expr_p = java_replace_reference (*expr_p, /* want_lvalue */ false);
126 *expr_p = java_gimplify_modify_expr (*expr_p);
130 if (TREE_CODE (TREE_OPERAND (*expr_p, 0)) == VAR_DECL)
131 TREE_OPERAND (*expr_p, 0)
132 = java_replace_reference (TREE_OPERAND (*expr_p, 0),
133 /* want_lvalue */ false);
136 /* These should already be lowered before we get here. */
141 case UNARY_PLUS_EXPR:
143 case NEW_ANONYMOUS_ARRAY_EXPR:
146 case SYNCHRONIZED_EXPR:
147 case CONDITIONAL_EXPR:
148 case INSTANCEOF_EXPR:
159 /* This is specific to the bytecode compiler. If a variable has
160 LOCAL_SLOT_P set, replace an assignment to it with an assignment to
161 the corresponding variable that holds all its aliases. */
164 java_gimplify_modify_expr (tree modify_expr)
166 tree lhs = TREE_OPERAND (modify_expr, 0);
167 tree rhs = TREE_OPERAND (modify_expr, 1);
168 tree lhs_type = TREE_TYPE (lhs);
170 if (TREE_CODE (lhs) == VAR_DECL
171 && DECL_LANG_SPECIFIC (lhs)
172 && LOCAL_SLOT_P (lhs)
173 && TREE_CODE (lhs_type) == POINTER_TYPE)
175 tree new_lhs = java_replace_reference (lhs, /* want_lvalue */ true);
176 tree new_rhs = build1 (NOP_EXPR, TREE_TYPE (new_lhs), rhs);
177 modify_expr = build2 (MODIFY_EXPR, TREE_TYPE (new_lhs),
179 modify_expr = build1 (NOP_EXPR, lhs_type, modify_expr);
187 java_gimplify_case_expr (tree expr)
189 tree label = create_artificial_label ();
190 return build3 (CASE_LABEL_EXPR, void_type_node,
191 TREE_OPERAND (expr, 0), NULL_TREE, label);
195 java_gimplify_default_expr (tree expr ATTRIBUTE_UNUSED)
197 tree label = create_artificial_label ();
198 return build3 (CASE_LABEL_EXPR, void_type_node, NULL_TREE, NULL_TREE, label);
201 /* Gimplify BLOCK into a BIND_EXPR. */
204 java_gimplify_block (tree java_block)
206 tree decls = BLOCK_VARS (java_block);
207 tree body = BLOCK_EXPR_BODY (java_block);
208 tree outer = gimple_current_bind_expr ();
211 /* Don't bother with empty blocks. */
213 return build_empty_stmt ();
215 if (IS_EMPTY_STMT (body))
218 /* Make a proper block. Java blocks are unsuitable for BIND_EXPR
219 because they use BLOCK_SUBBLOCKS for another purpose. */
220 block = make_node (BLOCK);
221 BLOCK_VARS (block) = decls;
223 /* The TREE_USED flag on a block determines whether the debug ouput
224 routines generate info for the variables in that block. */
225 TREE_USED (block) = 1;
227 if (outer != NULL_TREE)
229 outer = BIND_EXPR_BLOCK (outer);
230 BLOCK_SUBBLOCKS (outer) = chainon (BLOCK_SUBBLOCKS (outer), block);
233 return build3 (BIND_EXPR, TREE_TYPE (java_block), decls, body, block);
236 /* Gimplify a NEW_ARRAY_INIT node into array/element assignments. */
239 java_gimplify_new_array_init (tree exp)
241 tree array_type = TREE_TYPE (TREE_TYPE (exp));
242 tree data_field = lookup_field (&array_type, get_identifier ("data"));
243 tree element_type = TYPE_ARRAY_ELEMENT (array_type);
244 HOST_WIDE_INT ilength = java_array_type_length (array_type);
245 tree length = build_int_2 (ilength, 0);
246 tree init = TREE_OPERAND (exp, 0);
247 tree values = CONSTRUCTOR_ELTS (init);
249 tree array_ptr_type = build_pointer_type (array_type);
250 tree tmp = create_tmp_var (array_ptr_type, "array");
251 tree body = build2 (MODIFY_EXPR, array_ptr_type, tmp,
252 build_new_array (element_type, length));
256 /* FIXME: try to allocate array statically? */
257 while (values != NULL_TREE)
259 /* FIXME: Should use build_java_arrayaccess here, but avoid
261 tree lhs = build3 (COMPONENT_REF, TREE_TYPE (data_field),
262 build_java_indirect_ref (array_type, tmp, 0),
263 data_field, NULL_TREE);
264 tree assignment = build2 (MODIFY_EXPR, element_type,
265 build4 (ARRAY_REF, element_type, lhs,
266 build_int_2 (index++, 0),
267 NULL_TREE, NULL_TREE),
268 TREE_VALUE (values));
269 body = build2 (COMPOUND_EXPR, element_type, body, assignment);
270 values = TREE_CHAIN (values);
273 return build2 (COMPOUND_EXPR, array_ptr_type, body, tmp);
277 java_gimplify_try_expr (tree try_expr)
279 tree body = TREE_OPERAND (try_expr, 0);
280 tree handler = TREE_OPERAND (try_expr, 1);
281 tree catch = NULL_TREE;
283 /* Build a CATCH_EXPR for each handler. */
286 tree java_catch = TREE_OPERAND (handler, 0);
287 tree catch_type = TREE_TYPE (TREE_TYPE (BLOCK_EXPR_DECLS (java_catch)));
288 tree expr = build2 (CATCH_EXPR, void_type_node,
289 prepare_eh_table_type (catch_type),
292 catch = build2 (COMPOUND_EXPR, void_type_node, catch, expr);
295 handler = TREE_CHAIN (handler);
297 return build2 (TRY_CATCH_EXPR, void_type_node, body, catch);
300 /* Dump a tree of some kind. This is a convenience wrapper for the
301 dump_* functions in tree-dump.c. */
303 dump_java_tree (enum tree_dump_index phase, tree t)
308 stream = dump_begin (phase, &flags);
312 dump_node (t, flags, stream);
313 dump_end (phase, stream);