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
25 Contact: cacao@cacaojvm.org
27 Authors: Edwin Steiner
43 #include "mm/memory.h"
44 #include "vm/jit/code.h"
45 #include "vm/jit/codegen-common.h"
46 #include "vm/jit/methodheader.h"
47 #include "vmcore/options.h"
50 /* code_init *******************************************************************
52 Initialize the code-subsystem.
54 *******************************************************************************/
58 /* check for offset of code->m == 0 (see comment in code.h) */
60 assert(OFFSET(codeinfo, m) == 0);
68 /* code_codeinfo_new ***********************************************************
70 Create a new codeinfo for the given method.
73 m................method to create a new codeinfo for
75 The following fields are set in codeinfo:
78 all other fields are zeroed
81 a new, initialized codeinfo, or
82 NULL if an exception occurred.
84 *******************************************************************************/
86 codeinfo *code_codeinfo_new(methodinfo *m)
94 #if defined(ENABLE_STATISTICS)
96 size_codeinfo += sizeof(codeinfo);
103 /* code_find_codeinfo_for_pc ***************************************************
105 Return the codeinfo for the compilation unit that contains the
109 pc...............machine code position
112 the codeinfo * for the given PC
114 *******************************************************************************/
116 codeinfo *code_find_codeinfo_for_pc(u1 *pc)
120 pv = codegen_get_pv_from_pc(pc);
123 return *(codeinfo **)(pv + CodeinfoPointer);
127 /* code_get_sync_slot_count ****************************************************
129 Return the number of stack slots used for storing the synchronized object
130 (and the return value around lock_monitor_exit calls) by the given code.
133 code.............the codeinfo of the code in question
137 the number of stack slots used for synchronization
139 *******************************************************************************/
141 #if defined(ENABLE_REPLACEMENT)
142 int code_get_sync_slot_count(codeinfo *code)
144 #ifdef ENABLE_THREADS
152 if (!(code->m->flags & ACC_SYNCHRONIZED))
157 #ifdef HAS_4BYTE_STACKSLOT
158 /* long and double need 2 4-byte slots */
159 if (IS_2_WORD_TYPE(code->m->parseddesc->returntype.type))
163 #if defined(__POWERPC__)
164 /* powerpc needs an extra slot */
170 #else /* !ENABLE_THREADS */
174 #endif /* ENABLE_THREADS */
176 #endif /* defined(ENABLE_REPLACEMENT) */
179 /* code_get_stack_frame_size ***************************************************
181 Return the number of stack slots that the stack frame of the given code
184 IMPORTANT: The return value does *not* include the saved return address
185 slot, although it is part of non-leaf stack frames on RISC
186 architectures. The rationale behind this is that the saved
187 return address is never moved or changed by replacement, and
188 this way CISC and RISC architectures can be treated the same.
189 (See also doc/stack_frames.txt.)
192 code.............the codeinfo of the code in question
196 the number of stack slots
198 *******************************************************************************/
200 #if defined(ENABLE_REPLACEMENT)
201 int code_get_stack_frame_size(codeinfo *code)
208 /* slots allocated by register allocator plus saved registers */
210 #ifdef HAS_4BYTE_STACKSLOT
211 count = code->memuse + code->savedintcount + 2*code->savedfltcount;
213 count = code->memuse + code->savedintcount + code->savedfltcount;
216 /* add slots needed in synchronized methods */
218 count += code_get_sync_slot_count(code);
220 /* keep stack aligned */
222 #if defined(__X86_64__)
223 /* the x86_64 codegen only aligns the stack in non-leaf methods */
224 if (!code->isleafmethod || opt_verbosecall)
225 count |= 1; /* even when return address is added */
228 /* XXX align stack on alpha */
229 #if defined(__MIPS__)
230 if (code->isleafmethod)
231 count = (count + 1) & ~1;
233 count |= 1; /* even when return address is added */
236 #if defined(__POWERPC__)
237 /* keep stack 16-byte aligned */
238 count = (count + 3) & ~3;
244 return code->stackframesize;
246 #endif /* defined(ENABLE_REPLACEMENT) */
249 /* code_codeinfo_free **********************************************************
251 Free the memory used by a codeinfo.
254 code.............the codeinfo to free
256 *******************************************************************************/
258 void code_codeinfo_free(codeinfo *code)
263 if (code->mcode != NULL)
264 CFREE((void *) (ptrint) code->mcode, code->mcodelength);
266 #if defined(ENABLE_REPLACEMENT)
267 replace_free_replacement_points(code);
270 FREE(code, codeinfo);
272 #if defined(ENABLE_STATISTICS)
274 size_codeinfo -= sizeof(codeinfo);
279 /* code_free_code_of_method ****************************************************
281 Free all codeinfos of the given method
284 m................the method of which the codeinfos are to be freed
286 *******************************************************************************/
288 void code_free_code_of_method(methodinfo *m)
299 nextcode = code->prev;
300 code_codeinfo_free(code);
307 * These are local overrides for various environment variables in Emacs.
308 * Please do not remove this and leave it at the end of the file, where
309 * Emacs will automagically detect them.
310 * ---------------------------------------------------------------------
313 * indent-tabs-mode: t
317 * vim:noexpandtab:sw=4:ts=4: