1 /* vm/jit/replace.h - on-stack replacement of methods
3 Copyright (C) 1996-2005, 2006 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
39 /* forward typedefs ***********************************************************/
41 typedef struct rplpoint rplpoint;
42 typedef struct executionstate_t executionstate_t;
43 typedef struct sourcestate_t sourcestate_t;
44 typedef struct sourceframe_t sourceframe_t;
45 typedef struct replace_safestack_t replace_safestack_t;
53 #include "vm/method.h"
54 #include "vm/jit/reg.h"
57 /* alignment for the safe stack used during replacement */
59 #define REPLACE_STACK_ALIGNMENT 16
61 /* the size of the safe stack we use during replacement */
62 /* Must be a multiple of REPLACE_STACK_ALIGNMENT. */
64 #define REPLACE_SAFESTACK_SIZE 16384 /* bytes */
67 /*** structs *********************************************************/
69 typedef struct rplalloc rplalloc;
71 #define RPLALLOC_STACK -1
72 #define RPLALLOC_PARAM -2
73 #define RPLALLOC_SYNC -3
75 /* `rplalloc` is a compact struct for register allocation info */
77 /* XXX optimize this for space efficiency */
79 s4 index; /* local index, -1 for stack slot */
80 s4 regoff; /* register index / stack slot offset */
81 unsigned int flags:4; /* OR of (INMEMORY,...) */
82 unsigned int type:4; /* TYPE_... constant */
86 #error value of INMEMORY is too big to fit in rplalloc.flags
90 /* XXX what to do about overlapping rplpoints? */
91 /* CAUTION: Do not change the numerical values. These are used as */
92 /* indices into replace_normalize_type_map. */
93 #define RPLPOINT_TYPE_STD BBTYPE_STD
94 #define RPLPOINT_TYPE_EXH BBTYPE_EXH
95 #define RPLPOINT_TYPE_SBR BBTYPE_SBR
96 #define RPLPOINT_TYPE_CALL 3
97 #define RPLPOINT_TYPE_INLINE 4
98 #define RPLPOINT_TYPE_RETURN 5
99 #define RPLPOINT_TYPE_BODY 6
101 #define RPLPOINT_FLAG_NOTRAP 0x01 /* rplpoint cannot be trapped */
102 #define RPLPOINT_FLAG_ACTIVE 0x08 /* trap is active */
106 #define RPLPOINT_CHECK(type) , RPLPOINT_TYPE_##type
107 #define RPLPOINT_CHECK_BB(bptr) , (bptr)->type
109 #define RPLPOINT_CHECK(type)
110 #define RPLPOINT_CHECK_BB(bptr)
114 /* An `rplpoint` represents a replacement point in a compiled method */
117 u1 *pc; /* machine code PC of this point */
118 methodinfo *method; /* source method this point is in */
119 rplpoint *parent; /* rplpoint of the inlined body */ /* XXX unify with code */
120 rplalloc *regalloc; /* pointer to register index table */
121 s4 id; /* id of the rplpoint within method */
122 s4 callsize; /* size of call code in bytes */
123 unsigned int regalloccount:20; /* number of local allocations */
124 unsigned int type:4; /* RPLPOINT_TYPE_... constant */
125 unsigned int flags:8; /* OR of RPLPOINT_... constants */
129 /* An `executionsstate` represents the state of a thread as it reached */
130 /* an replacement point or is about to enter one. */
132 struct executionstate_t {
133 u1 *pc; /* program counter */
134 u1 *sp; /* stack pointer within method */
135 u1 *pv; /* procedure value. NULL means */
136 /* search the AVL tree */
138 u8 intregs[INT_REG_CNT]; /* register values */
139 u8 fltregs[FLT_REG_CNT]; /* register values */
141 codeinfo *code; /* codeinfo corresponding to the pv */
145 struct sourceframe_t {
146 sourceframe_t *down; /* source frame down the call chain */
148 methodinfo *method; /* method this frame is in */
154 u8 *javastack; /* values of stack vars */
155 u1 *javastacktype; /* types of stack vars */
156 s4 javastackdepth; /* number of stack vars */
158 u8 *javalocals; /* values of javalocals */
159 u1 *javalocaltype; /* types of javalocals */
160 s4 javalocalcount; /* number of javalocals */
163 s4 syncslotcount; /* XXX do we need more than one? */
165 rplpoint *fromrp; /* rplpoint used to read this frame */
166 codeinfo *fromcode; /* code this frame was using */
168 rplpoint *torp; /* rplpoint this frame was mapped to */
169 codeinfo *tocode; /* code this frame was mapped to */
173 struct sourcestate_t {
174 sourceframe_t *frames; /* list of source frames, from bottom up */
178 /* replace_safestack_t *********************************************************
180 This struct is used to allocate a safe stack area to be used during the
181 last phase of replacement. It also contains copies of all data needed
182 during this phase. (The data cannot be kept in normal variables, as
183 the C stack may be destroyed during replacement.)
185 CAUTION: Do not change the layout of this struct! The assembler code
186 depends on the order of fields. (`stack` must be first,
187 directly followed by `es`.)
189 *******************************************************************************/
191 struct replace_safestack_t {
192 u1 stack[REPLACE_SAFESTACK_SIZE];
195 u1 *mem; /* start of the allocated memory chunk */
200 /*** macros for the codegens *******************************************/
202 #define REPLACEMENT_POINTS_INIT(cd, jd) \
203 if (!replace_create_replacement_points(jd)) \
205 (cd)->replacementpoint = (jd)->code->rplpoints;
207 #define REPLACEMENT_POINT_BLOCK_START(cd, bptr) \
208 if ((bptr)->bitflags & BBFLAG_REPLACEMENT) \
209 codegen_set_replacement_point((cd) RPLPOINT_CHECK_BB(bptr));
211 #define REPLACEMENT_POINT_INLINE_START(cd, iptr) \
212 codegen_set_replacement_point(cd RPLPOINT_CHECK(INLINE));
214 #define REPLACEMENT_POINT_INLINE_BODY(cd, iptr) \
215 codegen_set_replacement_point_notrap(cd RPLPOINT_CHECK(BODY));
217 #define REPLACEMENT_POINT_RETURN(cd, iptr) \
218 codegen_set_replacement_point(cd RPLPOINT_CHECK(RETURN));
220 #define REPLACEMENT_POINT_INVOKE(cd, iptr) \
221 codegen_set_replacement_point(cd RPLPOINT_CHECK(CALL));
223 #define REPLACEMENT_POINT_INVOKE_RETURN(cd, iptr) \
224 if (iptr->opc != ICMD_BUILTIN) \
225 cd->replacementpoint[-1].callsize = (cd->mcodeptr - cd->mcodebase)\
226 - (ptrint) cd->replacementpoint[-1].pc;
228 #define REPLACEMENT_EMIT_STUBS(jd) \
229 emit_replacement_stubs(jd);
231 /*** prototypes ********************************************************/
233 bool replace_create_replacement_points(jitdata *jd);
234 void replace_free_replacement_points(codeinfo *code);
236 void replace_activate_replacement_points(codeinfo *code, bool mappable);
237 void replace_deactivate_replacement_points(codeinfo *code);
239 void replace_me(rplpoint *rp,executionstate_t *es);
242 void replace_show_replacement_points(codeinfo *code);
243 void replace_replacement_point_println(rplpoint *rp, int depth);
244 void replace_executionstate_println(executionstate_t *es);
245 void replace_sourcestate_println(sourcestate_t *ss);
246 void replace_sourcestate_println_short(sourcestate_t *ss);
247 void replace_source_frame_println(sourceframe_t *frame);
250 /* machine dependent functions (code in ARCH_DIR/md.c) */
252 #if defined(ENABLE_JIT)
253 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp,
260 * These are local overrides for various environment variables in Emacs.
261 * Please do not remove this and leave it at the end of the file, where
262 * Emacs will automagically detect them.
263 * ---------------------------------------------------------------------
266 * indent-tabs-mode: t
270 * vim:noexpandtab:sw=4:ts=4: