1 /* src/vm/jit/code.c - codeinfo struct for representing compiled code
3 Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
38 #include "mm/memory.h"
40 #if defined(ENABLE_THREADS)
41 # include "threads/native/lock.h"
44 #include "vm/jit/code.h"
45 #include "vm/jit/codegen-common.h"
46 #include "vm/jit/methodheader.h"
48 #include "vmcore/options.h"
51 /* code_init *******************************************************************
53 Initialize the code-subsystem.
55 *******************************************************************************/
59 /* check for offset of code->m == 0 (see comment in code.h) */
61 assert(OFFSET(codeinfo, m) == 0);
69 /* code_codeinfo_new ***********************************************************
71 Create a new codeinfo for the given method.
74 m................method to create a new codeinfo for
76 The following fields are set in codeinfo:
79 all other fields are zeroed
82 a new, initialized codeinfo, or
83 NULL if an exception occurred.
85 *******************************************************************************/
87 codeinfo *code_codeinfo_new(methodinfo *m)
95 #if defined(ENABLE_THREADS)
96 lock_init_object_lock(&code->header);
99 #if defined(ENABLE_STATISTICS)
101 size_codeinfo += sizeof(codeinfo);
108 /* code_find_codeinfo_for_pc ***************************************************
110 Return the codeinfo for the compilation unit that contains the
114 pc...............machine code position
117 the codeinfo * for the given PC
119 *******************************************************************************/
121 codeinfo *code_find_codeinfo_for_pc(u1 *pc)
125 pv = codegen_get_pv_from_pc(pc);
128 return *(codeinfo **)(pv + CodeinfoPointer);
132 /* code_get_sync_slot_count ****************************************************
134 Return the number of stack slots used for storing the synchronized object
135 (and the return value around lock_monitor_exit calls) by the given code.
138 code.............the codeinfo of the code in question
142 the number of stack slots used for synchronization
144 *******************************************************************************/
146 #if defined(ENABLE_REPLACEMENT)
147 int code_get_sync_slot_count(codeinfo *code)
149 #ifdef ENABLE_THREADS
157 if (!(code->m->flags & ACC_SYNCHRONIZED))
162 #ifdef HAS_4BYTE_STACKSLOT
163 /* long and double need 2 4-byte slots */
164 if (IS_2_WORD_TYPE(code->m->parseddesc->returntype.type))
168 #if defined(__POWERPC__)
169 /* powerpc needs an extra slot */
175 #else /* !ENABLE_THREADS */
179 #endif /* ENABLE_THREADS */
181 #endif /* defined(ENABLE_REPLACEMENT) */
184 /* code_get_stack_frame_size ***************************************************
186 Return the number of stack slots that the stack frame of the given code
189 IMPORTANT: The return value does *not* include the saved return address
190 slot, although it is part of non-leaf stack frames on RISC
191 architectures. The rationale behind this is that the saved
192 return address is never moved or changed by replacement, and
193 this way CISC and RISC architectures can be treated the same.
194 (See also doc/stack_frames.txt.)
197 code.............the codeinfo of the code in question
201 the number of stack slots
203 *******************************************************************************/
205 #if defined(ENABLE_REPLACEMENT)
206 int code_get_stack_frame_size(codeinfo *code)
213 /* slots allocated by register allocator plus saved registers */
215 #ifdef HAS_4BYTE_STACKSLOT
216 count = code->memuse + code->savedintcount + 2*code->savedfltcount;
218 count = code->memuse + code->savedintcount + code->savedfltcount;
221 /* add slots needed in synchronized methods */
223 count += code_get_sync_slot_count(code);
225 /* keep stack aligned */
227 #if defined(__X86_64__)
228 /* the x86_64 codegen only aligns the stack in non-leaf methods */
229 if (!code->isleafmethod || opt_verbosecall)
230 count |= 1; /* even when return address is added */
233 /* XXX align stack on alpha */
234 #if defined(__MIPS__)
235 if (code->isleafmethod)
236 count = (count + 1) & ~1;
238 count |= 1; /* even when return address is added */
241 #if defined(__POWERPC__)
242 /* keep stack 16-byte aligned */
243 count = (count + 3) & ~3;
249 return code->stackframesize;
251 #endif /* defined(ENABLE_REPLACEMENT) */
254 /* code_codeinfo_free **********************************************************
256 Free the memory used by a codeinfo.
259 code.............the codeinfo to free
261 *******************************************************************************/
263 void code_codeinfo_free(codeinfo *code)
268 if (code->mcode != NULL)
269 CFREE((void *) (ptrint) code->mcode, code->mcodelength);
271 #if defined(ENABLE_REPLACEMENT)
272 replace_free_replacement_points(code);
275 FREE(code, codeinfo);
277 #if defined(ENABLE_STATISTICS)
279 size_codeinfo -= sizeof(codeinfo);
284 /* code_free_code_of_method ****************************************************
286 Free all codeinfos of the given method
289 m................the method of which the codeinfos are to be freed
291 *******************************************************************************/
293 void code_free_code_of_method(methodinfo *m)
304 nextcode = code->prev;
305 code_codeinfo_free(code);
312 * These are local overrides for various environment variables in Emacs.
313 * Please do not remove this and leave it at the end of the file, where
314 * Emacs will automagically detect them.
315 * ---------------------------------------------------------------------
318 * indent-tabs-mode: t
322 * vim:noexpandtab:sw=4:ts=4: