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e04a16fb AG |
1 | /* Handle the constant pool of the Java(TM) Virtual Machine. |
2 | Copyright (C) 1997 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC 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) | |
9 | any later version. | |
10 | ||
11 | GNU CC 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. | |
15 | You should have received a copy of the GNU General Public License | |
16 | along with GNU CC; see the file COPYING. If not, write to | |
17 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. | |
19 | ||
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. */ | |
23 | ||
24 | #include "config.h" | |
1f43f4b4 | 25 | #include "system.h" |
e04a16fb AG |
26 | #include "tree.h" |
27 | #include "java-tree.h" | |
28 | #include "jcf.h" | |
1f43f4b4 | 29 | #include "toplev.h" |
e04a16fb AG |
30 | |
31 | extern struct obstack permanent_obstack; | |
32 | ||
33 | /* Set the INDEX'th constant in CPOOL to have the given TAG and VALUE. */ | |
34 | ||
35 | void | |
36 | set_constant_entry (cpool, index, tag, value) | |
37 | CPool *cpool; | |
38 | int index; | |
39 | int tag; | |
40 | jword value; | |
41 | { | |
42 | if (cpool->data == NULL) | |
43 | { | |
44 | cpool->capacity = 100; | |
45 | cpool->tags = (uint8*) xmalloc (sizeof(uint8) * cpool->capacity); | |
46 | cpool->data = (jword*) xmalloc (sizeof(jword) * cpool->capacity); | |
47 | cpool->count = 1; | |
48 | } | |
49 | if (index >= cpool->capacity) | |
50 | { | |
51 | cpool->capacity *= 2; | |
52 | if (index >= cpool->capacity) | |
53 | cpool->capacity = index + 10; | |
54 | cpool->tags = (uint8*) xrealloc (cpool->tags, | |
55 | sizeof(uint8) * cpool->capacity); | |
56 | cpool->data = (jword*) xrealloc (cpool->data, | |
57 | sizeof(jword) * cpool->capacity); | |
58 | } | |
59 | if (index >= cpool->count) | |
60 | cpool->count = index + 1; | |
61 | cpool->tags[index] = tag; | |
62 | cpool->data[index] = value; | |
63 | } | |
64 | ||
65 | /* Find (or create) a constant pool entry matching TAG and VALUE. */ | |
66 | ||
67 | int | |
68 | find_constant1 (cpool, tag, value) | |
69 | CPool *cpool; | |
70 | int tag; | |
71 | jword value; | |
72 | { | |
73 | int i; | |
74 | for (i = cpool->count; --i > 0; ) | |
75 | { | |
76 | if (cpool->tags[i] == tag && cpool->data[i] == value) | |
77 | return i; | |
78 | } | |
79 | i = cpool->count == 0 ? 1 : cpool->count; | |
80 | set_constant_entry (cpool, i, tag, value); | |
81 | return i; | |
82 | } | |
83 | ||
84 | /* Find a double-word constant pool entry matching TAG and WORD1/WORD2. */ | |
85 | ||
86 | int | |
87 | find_constant2 (cpool, tag, word1, word2) | |
88 | CPool *cpool; | |
89 | int tag; | |
90 | jword word1, word2; | |
91 | { | |
92 | int i; | |
93 | for (i = cpool->count - 1; --i > 0; ) | |
94 | { | |
95 | if (cpool->tags[i] == tag | |
96 | && cpool->data[i] == word1 | |
97 | && cpool->data[i+1] == word2) | |
98 | return i; | |
99 | } | |
100 | i = cpool->count == 0 ? 1 : cpool->count; | |
101 | set_constant_entry (cpool, i, tag, word1); | |
102 | set_constant_entry (cpool, i+1, 0, word2); | |
103 | return i; | |
104 | } | |
105 | ||
106 | int | |
107 | find_utf8_constant (cpool, name) | |
108 | CPool *cpool; | |
109 | tree name; | |
110 | { | |
111 | if (name == NULL_TREE) | |
112 | return 0; | |
113 | return find_constant1 (cpool, CONSTANT_Utf8, (jword) name); | |
114 | } | |
115 | ||
116 | int | |
117 | find_class_or_string_constant (cpool, tag, name) | |
118 | CPool *cpool; | |
119 | int tag; | |
120 | tree name; | |
121 | { | |
122 | int j = find_utf8_constant (cpool, name); | |
123 | int i; | |
124 | for (i = cpool->count; --i > 0; ) | |
125 | { | |
7e21fe59 | 126 | if (cpool->tags[i] == tag && cpool->data[i] == (jword) j) |
e04a16fb AG |
127 | return i; |
128 | } | |
129 | i = cpool->count; | |
130 | set_constant_entry (cpool, i, tag, (jword) j); | |
131 | return i; | |
132 | } | |
133 | ||
134 | int | |
135 | find_class_constant (cpool, type) | |
136 | CPool *cpool; | |
137 | tree type; | |
138 | { | |
139 | return find_class_or_string_constant (cpool, CONSTANT_Class, | |
140 | build_internal_class_name (type)); | |
141 | } | |
142 | ||
d640220c PB |
143 | /* Allocate a CONSTANT_string entry given a STRING_CST. */ |
144 | ||
145 | int | |
146 | find_string_constant (cpool, string) | |
147 | CPool *cpool; | |
148 | tree string; | |
149 | { | |
150 | string = get_identifier (TREE_STRING_POINTER (string)); | |
151 | return find_class_or_string_constant (cpool, CONSTANT_String, string); | |
152 | ||
153 | } | |
154 | ||
e04a16fb AG |
155 | /* Find (or create) a CONSTANT_NameAndType matching NAME and TYPE. |
156 | Return its index in the constant pool CPOOL. */ | |
157 | ||
158 | int | |
159 | find_name_and_type_constant (cpool, name, type) | |
160 | CPool *cpool; | |
161 | tree name; | |
162 | tree type; | |
163 | { | |
164 | int name_index = find_utf8_constant (cpool, name); | |
165 | int type_index = find_utf8_constant (cpool, build_java_signature (type)); | |
166 | return find_constant1 (cpool, CONSTANT_NameAndType, | |
167 | (name_index << 16) | type_index); | |
168 | } | |
169 | ||
170 | /* Find (or create) a CONSTANT_Fieldref for DECL (a FIELD_DECL or VAR_DECL). | |
171 | Return its index in the constant pool CPOOL. */ | |
172 | ||
173 | int | |
174 | find_fieldref_index (cpool, decl) | |
175 | CPool *cpool; | |
176 | tree decl; | |
177 | { | |
178 | int class_index = find_class_constant (cpool, DECL_CONTEXT (decl)); | |
179 | int name_type_index | |
180 | = find_name_and_type_constant (cpool, DECL_NAME (decl), TREE_TYPE (decl)); | |
181 | return find_constant1 (cpool, CONSTANT_Fieldref, | |
182 | (class_index << 16) | name_type_index); | |
183 | } | |
184 | ||
185 | /* Find (or create) a CONSTANT_Methodref for DECL (a FUNCTION_DECL). | |
186 | Return its index in the constant pool CPOOL. */ | |
187 | ||
188 | int | |
189 | find_methodref_index (cpool, decl) | |
190 | CPool *cpool; | |
191 | tree decl; | |
192 | { | |
72a0aac6 PB |
193 | tree mclass = DECL_CONTEXT (decl); |
194 | int class_index = find_class_constant (cpool, mclass); | |
e04a16fb AG |
195 | tree name = DECL_CONSTRUCTOR_P (decl) ? init_identifier_node |
196 | : DECL_NAME (decl); | |
197 | int name_type_index | |
198 | = find_name_and_type_constant (cpool, name, TREE_TYPE (decl)); | |
72a0aac6 PB |
199 | return find_constant1 (cpool, |
200 | CLASS_INTERFACE (TYPE_NAME (mclass)) | |
201 | ? CONSTANT_InterfaceMethodref | |
202 | : CONSTANT_Methodref, | |
e04a16fb AG |
203 | (class_index << 16) | name_type_index); |
204 | } | |
205 | ||
206 | #define PUT1(X) (*ptr++ = (X)) | |
207 | #define PUT2(X) (PUT1((X) >> 8), PUT1(X)) | |
208 | #define PUT4(X) (PUT2((X) >> 16), PUT2(X)) | |
209 | #define PUTN(P, N) (bcopy(P, ptr, N), ptr += (N)) | |
210 | ||
211 | /* Give the number of bytes needed in a .class file for the CPOOL | |
212 | constant pool. Includes the 2-byte constant_pool_count. */ | |
213 | ||
214 | int | |
215 | count_constant_pool_bytes (cpool) | |
216 | CPool *cpool; | |
217 | { | |
218 | int size = 2; | |
219 | int i = 1; | |
d640220c | 220 | for ( ; i < cpool->count; i++) |
e04a16fb AG |
221 | { |
222 | size++; | |
223 | switch (cpool->tags[i]) | |
224 | { | |
225 | case CONSTANT_NameAndType: | |
226 | case CONSTANT_Fieldref: | |
227 | case CONSTANT_Methodref: | |
228 | case CONSTANT_InterfaceMethodref: | |
229 | case CONSTANT_Float: | |
230 | case CONSTANT_Integer: | |
231 | size += 4; | |
232 | break; | |
233 | case CONSTANT_Class: | |
234 | case CONSTANT_String: | |
235 | size += 2; | |
236 | break; | |
237 | case CONSTANT_Long: | |
238 | case CONSTANT_Double: | |
d640220c PB |
239 | size += 8; |
240 | i++; | |
e04a16fb AG |
241 | break; |
242 | case CONSTANT_Utf8: | |
243 | { | |
d640220c | 244 | tree t = (tree) cpool->data[i]; |
e04a16fb AG |
245 | int len = IDENTIFIER_LENGTH (t); |
246 | size += len + 2; | |
247 | } | |
248 | break; | |
d640220c PB |
249 | default: |
250 | /* Second word of CONSTANT_Long and CONSTANT_Double. */ | |
251 | size--; | |
e04a16fb AG |
252 | } |
253 | } | |
254 | return size; | |
255 | } | |
256 | ||
257 | /* Write the constant pool CPOOL into BUFFER. | |
258 | The length of BUFFER is LENGTH, which must match the needed length. */ | |
259 | ||
260 | void | |
261 | write_constant_pool (cpool, buffer, length) | |
262 | CPool *cpool; | |
263 | unsigned char* buffer; | |
264 | int length; | |
265 | { | |
266 | unsigned char* ptr = buffer; | |
267 | int i = 1; | |
268 | jword *datap = &cpool->data[1]; | |
269 | PUT2 (cpool->count); | |
270 | for ( ; i < cpool->count; i++, datap++) | |
271 | { | |
272 | int tag = cpool->tags[i]; | |
273 | PUT1 (tag); | |
274 | switch (tag) | |
275 | { | |
276 | case CONSTANT_NameAndType: | |
277 | case CONSTANT_Fieldref: | |
278 | case CONSTANT_Methodref: | |
279 | case CONSTANT_InterfaceMethodref: | |
280 | case CONSTANT_Float: | |
281 | case CONSTANT_Integer: | |
282 | PUT4 (*datap); | |
283 | break; | |
284 | case CONSTANT_Class: | |
285 | case CONSTANT_String: | |
286 | PUT2 (*datap); | |
287 | break; | |
288 | break; | |
289 | case CONSTANT_Long: | |
290 | case CONSTANT_Double: | |
291 | PUT4(*datap); | |
292 | i++; | |
293 | datap++; | |
294 | PUT4 (*datap); | |
295 | break; | |
296 | case CONSTANT_Utf8: | |
297 | { | |
298 | tree t = (tree) *datap; | |
299 | int len = IDENTIFIER_LENGTH (t); | |
300 | PUT2 (len); | |
301 | PUTN (IDENTIFIER_POINTER (t), len); | |
302 | } | |
303 | break; | |
304 | } | |
305 | } | |
306 | if (ptr != buffer + length) | |
307 | fatal("internal error - incorrect constant pool"); | |
308 | } | |
309 | ||
310 | CPool *outgoing_cpool; | |
311 | ||
312 | /* If non-NULL, an ADDR_EXPR referencing a VAR_DECL containing | |
313 | the constant data array for the current class. */ | |
314 | tree current_constant_pool_data_ref; | |
315 | ||
316 | /* A Cache for build_int_2 (CONSTANT_XXX, 0). */ | |
317 | static tree tag_nodes[13]; | |
318 | ||
319 | tree | |
320 | get_tag_node (tag) | |
321 | int tag; | |
322 | { | |
323 | if (tag_nodes[tag] == NULL_TREE) | |
324 | { | |
325 | push_obstacks (&permanent_obstack, &permanent_obstack); | |
326 | tag_nodes[tag] = build_int_2 (tag, 0); | |
327 | pop_obstacks (); | |
328 | } | |
329 | return tag_nodes[tag]; | |
330 | } | |
331 | ||
332 | /* Look for a constant pool entry that matches TAG and NAME. | |
333 | Creates a new entry if not found. | |
334 | TAG is one of CONSTANT_Utf8, CONSTANT_String or CONSTANT_Class. | |
335 | NAME is an IDENTIFIER_NODE naming the Utf8 constant, string, or class. | |
336 | Returns the index of the entry. */ | |
337 | ||
338 | int | |
339 | alloc_name_constant (tag, name) | |
340 | int tag; | |
341 | tree name; | |
342 | { | |
343 | return find_constant1 (outgoing_cpool, tag, (jword) name); | |
344 | } | |
345 | ||
346 | /* Build an identifier for the internal name of reference type TYPE. */ | |
347 | ||
348 | tree | |
349 | build_internal_class_name (type) | |
350 | tree type; | |
351 | { | |
352 | tree name; | |
353 | if (TYPE_ARRAY_P (type)) | |
354 | name = build_java_signature (type); | |
355 | else | |
356 | { | |
357 | name = TYPE_NAME (type); | |
358 | if (TREE_CODE (name) != IDENTIFIER_NODE) | |
359 | name = DECL_NAME (name); | |
360 | name = identifier_subst (name, "", '.', '/', ""); | |
361 | } | |
362 | return name; | |
363 | } | |
364 | ||
365 | /* Look for a CONSTANT_Class entry for CLAS, creating a new one if needed. */ | |
366 | ||
367 | int | |
368 | alloc_class_constant (clas) | |
369 | tree clas; | |
370 | { | |
7e57923c AH |
371 | tree class_name = build_internal_class_name (clas); |
372 | ||
e04a16fb | 373 | return alloc_name_constant (CONSTANT_Class, |
7e57923c AH |
374 | (unmangle_classname |
375 | (IDENTIFIER_POINTER(class_name), | |
376 | IDENTIFIER_LENGTH(class_name)))); | |
e04a16fb AG |
377 | } |
378 | ||
379 | /* Return a reference to the data array of the current constant pool. */ | |
380 | ||
381 | tree | |
382 | build_constant_data_ref () | |
383 | { | |
384 | if (current_constant_pool_data_ref == NULL_TREE) | |
385 | { | |
386 | tree decl; | |
387 | tree decl_name = mangled_classname ("_CD_", current_class); | |
388 | push_obstacks (&permanent_obstack, &permanent_obstack); | |
389 | decl = build_decl (VAR_DECL, decl_name, | |
390 | build_array_type (ptr_type_node, | |
391 | one_elt_array_domain_type)); | |
392 | TREE_STATIC (decl) = 1; | |
393 | make_decl_rtl (decl, NULL, 1); | |
394 | pop_obstacks (); | |
395 | current_constant_pool_data_ref | |
396 | = build1 (ADDR_EXPR, ptr_type_node, decl); | |
397 | } | |
398 | return current_constant_pool_data_ref; | |
399 | } | |
400 | ||
401 | /* Get the pointer value at the INDEX'th element of the constant pool. */ | |
402 | ||
403 | tree | |
404 | build_ref_from_constant_pool (index) | |
405 | int index; | |
406 | { | |
407 | tree t = build_constant_data_ref (); | |
408 | index *= int_size_in_bytes (ptr_type_node); | |
409 | t = fold (build (PLUS_EXPR, ptr_type_node, | |
410 | t, build_int_2 (index, 0))); | |
411 | return build1 (INDIRECT_REF, ptr_type_node, t); | |
412 | } | |
413 | ||
414 | /* Build an initializer for the constants field of the current constal pool. | |
415 | Should only be called at top-level, since it may emit declarations. */ | |
416 | ||
417 | tree | |
418 | build_constants_constructor () | |
419 | { | |
420 | tree tags_value, data_value; | |
421 | tree cons; | |
422 | tree tags_list = NULL_TREE; | |
423 | tree data_list = NULL_TREE; | |
424 | int i; | |
425 | for (i = outgoing_cpool->count; --i > 0; ) | |
426 | { | |
427 | tags_list | |
428 | = tree_cons (NULL_TREE, get_tag_node (outgoing_cpool->tags[i]), | |
429 | tags_list); | |
430 | data_list | |
431 | = tree_cons (NULL_TREE, build_utf8_ref ((tree)outgoing_cpool->data[i]), | |
432 | data_list); | |
433 | } | |
434 | if (outgoing_cpool->count > 0) | |
435 | { | |
436 | tree index_type; | |
437 | tree data_decl, tags_decl, tags_type; | |
438 | tree max_index = build_int_2 (outgoing_cpool->count - 1, 0); | |
439 | TREE_TYPE (max_index) = sizetype; | |
440 | index_type = build_index_type (max_index); | |
441 | ||
442 | /* Add dummy 0'th element of constant pool. */ | |
443 | tags_list = tree_cons (NULL_TREE, get_tag_node (0), tags_list); | |
444 | data_list = tree_cons (NULL_TREE, null_pointer_node, data_list); | |
445 | ||
446 | data_decl = TREE_OPERAND (build_constant_data_ref (), 0); | |
447 | TREE_TYPE (data_decl) = build_array_type (ptr_type_node, index_type), | |
448 | DECL_INITIAL (data_decl) = build (CONSTRUCTOR, TREE_TYPE (data_decl), | |
449 | NULL_TREE, data_list); | |
450 | DECL_SIZE (data_decl) = TYPE_SIZE (TREE_TYPE (data_decl)); | |
451 | rest_of_decl_compilation (data_decl, (char*) 0, 1, 0); | |
452 | data_value = build_address_of (data_decl); | |
453 | ||
454 | tags_type = build_array_type (unsigned_byte_type_node, index_type); | |
455 | tags_decl = build_decl (VAR_DECL, mangled_classname ("_CT_", | |
456 | current_class), | |
457 | tags_type); | |
458 | TREE_STATIC (tags_decl) = 1; | |
459 | DECL_INITIAL (tags_decl) = build (CONSTRUCTOR, tags_type, | |
460 | NULL_TREE, tags_list); | |
461 | rest_of_decl_compilation (tags_decl, (char*) 0, 1, 0); | |
462 | tags_value = build_address_of (tags_decl); | |
463 | } | |
464 | else | |
465 | { | |
466 | data_value = null_pointer_node; | |
467 | tags_value = null_pointer_node; | |
468 | } | |
469 | START_RECORD_CONSTRUCTOR (cons, constants_type_node); | |
470 | PUSH_FIELD_VALUE (cons, "size", build_int_2 (outgoing_cpool->count, 0)); | |
471 | PUSH_FIELD_VALUE (cons, "tags", tags_value); | |
472 | PUSH_FIELD_VALUE (cons, "data", data_value); | |
473 | FINISH_RECORD_CONSTRUCTOR (cons); | |
474 | return cons; | |
475 | } |