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git.ipfire.org Git - thirdparty/gcc.git/blob - gcc/java/java-gimplify.c
1 /* Java(TM) language-specific gimplification routines.
2 Copyright (C) 2003, 2004, 2006, 2007, 2007, 2008
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>.
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"
35 static tree
java_gimplify_block (tree
);
36 static enum gimplify_status
java_gimplify_modify_expr (tree
*);
37 static enum gimplify_status
java_gimplify_self_mod_expr (tree
*, gimple_seq
*,
40 static void dump_java_tree (enum tree_dump_index
, tree
);
42 /* Convert a Java tree to GENERIC. */
45 java_genericize (tree fndecl
)
47 dump_java_tree (TDI_original
, fndecl
);
49 /* Genericize with the gimplifier. */
50 gimplify_function_tree (fndecl
);
52 dump_function (TDI_generic
, fndecl
);
55 /* Gimplify a Java tree. */
58 java_gimplify_expr (tree
*expr_p
, gimple_seq
*pre_p
, gimple_seq
*post_p
)
60 enum tree_code code
= TREE_CODE (*expr_p
);
65 *expr_p
= java_gimplify_block (*expr_p
);
69 *expr_p
= java_replace_reference (*expr_p
, /* want_lvalue */ false);
73 return java_gimplify_modify_expr (expr_p
);
76 /* Note that we can see <save_expr NULL> if the save_expr was
77 already handled by gimplify_save_expr. */
78 if (TREE_OPERAND (*expr_p
, 0) != NULL_TREE
79 && TREE_CODE (TREE_OPERAND (*expr_p
, 0)) == VAR_DECL
)
80 TREE_OPERAND (*expr_p
, 0)
81 = java_replace_reference (TREE_OPERAND (*expr_p
, 0),
82 /* want_lvalue */ false);
85 case POSTINCREMENT_EXPR
:
86 case POSTDECREMENT_EXPR
:
87 case PREINCREMENT_EXPR
:
88 case PREDECREMENT_EXPR
:
89 return java_gimplify_self_mod_expr (expr_p
, pre_p
, post_p
);
91 /* These should already be lowered before we get here. */
105 static enum gimplify_status
106 java_gimplify_modify_expr (tree
*modify_expr_p
)
108 tree modify_expr
= *modify_expr_p
;
109 tree lhs
= TREE_OPERAND (modify_expr
, 0);
110 tree rhs
= TREE_OPERAND (modify_expr
, 1);
111 tree lhs_type
= TREE_TYPE (lhs
);
113 /* This is specific to the bytecode compiler. If a variable has
114 LOCAL_SLOT_P set, replace an assignment to it with an assignment
115 to the corresponding variable that holds all its aliases. */
116 if (TREE_CODE (lhs
) == VAR_DECL
117 && DECL_LANG_SPECIFIC (lhs
)
118 && LOCAL_SLOT_P (lhs
)
119 && TREE_CODE (lhs_type
) == POINTER_TYPE
)
121 tree new_lhs
= java_replace_reference (lhs
, /* want_lvalue */ true);
122 tree new_rhs
= build1 (NOP_EXPR
, TREE_TYPE (new_lhs
), rhs
);
123 modify_expr
= build2 (MODIFY_EXPR
, TREE_TYPE (new_lhs
),
125 modify_expr
= build1 (NOP_EXPR
, lhs_type
, modify_expr
);
127 else if (lhs_type
!= TREE_TYPE (rhs
))
128 /* Fix up type mismatches to make legal GIMPLE. These are
129 generated in several places, in particular null pointer
130 assignment and subclass assignment. */
131 TREE_OPERAND (modify_expr
, 1) = convert (lhs_type
, rhs
);
133 *modify_expr_p
= modify_expr
;
137 /* Special case handling for volatiles: we need to generate a barrier
138 between the reading and the writing. */
140 static enum gimplify_status
141 java_gimplify_self_mod_expr (tree
*expr_p
, gimple_seq
*pre_p ATTRIBUTE_UNUSED
,
142 gimple_seq
*post_p ATTRIBUTE_UNUSED
)
144 tree lhs
= TREE_OPERAND (*expr_p
, 0);
146 if (TREE_CODE (lhs
) == COMPONENT_REF
147 && TREE_THIS_VOLATILE (TREE_OPERAND (lhs
, 1)))
148 TREE_THIS_VOLATILE (lhs
) = 1;
154 /* Gimplify BLOCK into a BIND_EXPR. */
157 java_gimplify_block (tree java_block
)
159 tree decls
= BLOCK_VARS (java_block
);
160 tree body
= BLOCK_EXPR_BODY (java_block
);
161 gimple outer
= gimple_current_bind_expr ();
164 /* Don't bother with empty blocks. */
166 return build_empty_stmt (input_location
);
168 if (IS_EMPTY_STMT (body
))
171 /* Make a proper block. Java blocks are unsuitable for BIND_EXPR
172 because they use BLOCK_SUBBLOCKS for another purpose. */
173 block
= make_node (BLOCK
);
174 BLOCK_VARS (block
) = decls
;
176 /* The TREE_USED flag on a block determines whether the debug output
177 routines generate info for the variables in that block. */
178 TREE_USED (block
) = 1;
182 tree b
= gimple_bind_block (outer
);
183 BLOCK_SUBBLOCKS (b
) = chainon (BLOCK_SUBBLOCKS (b
), block
);
185 BLOCK_EXPR_BODY (java_block
) = NULL_TREE
;
187 return build3 (BIND_EXPR
, TREE_TYPE (java_block
), decls
, body
, block
);
190 /* Dump a tree of some kind. This is a convenience wrapper for the
191 dump_* functions in tree-dump.c. */
193 dump_java_tree (enum tree_dump_index phase
, tree t
)
198 stream
= dump_begin (phase
, &flags
);
202 dump_node (t
, flags
, stream
);
203 dump_end (phase
, stream
);