1 /* src/vm/jit/codegen-common.c - architecture independent code generator stuff
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: Reinhard Grafl
30 Changes: Christian Thalinger
34 All functions assume the following code area / data area layout:
38 | code area | code area grows to higher addresses
40 +-----------+ <-- start of procedure
42 | data area | data area grows to lower addresses
46 The functions first write into a temporary code/data area allocated by
47 "codegen_init". "codegen_finish" copies the code and data area into permanent
48 memory. All functions writing values into the data area return the offset
49 relative the begin of the code area (start of procedure).
51 $Id: codegen-common.c 5943 2006-11-09 15:27:03Z twisti $
63 #if defined(ENABLE_JIT)
64 /* this is required PATCHER_CALL_SIZE */
69 /* this is required for REG_SPLIT */
73 #include "mm/memory.h"
74 #include "toolbox/avl.h"
75 #include "toolbox/list.h"
76 #include "toolbox/logging.h"
77 #include "native/jni.h"
78 #include "native/native.h"
80 #if defined(ENABLE_THREADS)
81 # include "threads/native/threads.h"
84 #include "vm/exceptions.h"
85 #include "vm/method.h"
86 #include "vm/options.h"
87 #include "vm/statistics.h"
88 #include "vm/stringlocal.h"
89 #include "vm/jit/asmpart.h"
90 #include "vm/jit/codegen-common.h"
92 #if defined(ENABLE_DISASSEMBLER)
93 # include "vm/jit/disass.h"
96 #include "vm/jit/dseg.h"
97 #include "vm/jit/jit.h"
98 #include "vm/jit/stacktrace.h"
99 #include "vm/jit/replace.h"
101 #if defined(ENABLE_INTRP)
102 #include "vm/jit/intrp/intrp.h"
106 /* in this tree we store all method addresses *********************************/
108 static avl_tree *methodtree = NULL;
109 static s4 methodtree_comparator(const void *pc, const void *element);
112 /* codegen_init ****************************************************************
116 *******************************************************************************/
118 void codegen_init(void)
120 /* this tree is global, not method specific */
123 #if defined(ENABLE_JIT)
124 methodtree_element *mte;
127 methodtree = avl_create(&methodtree_comparator);
129 #if defined(ENABLE_JIT)
130 /* insert asm_vm_call_method */
132 mte = NEW(methodtree_element);
134 mte->startpc = (u1 *) (ptrint) asm_vm_call_method;
135 mte->endpc = (u1 *) ((ptrint) asm_call_jit_compiler - 1);
137 avl_insert(methodtree, mte);
138 #endif /* defined(ENABLE_JIT) */
143 /* codegen_setup ***************************************************************
145 Allocates and initialises code area, data area and references.
147 *******************************************************************************/
149 void codegen_setup(jitdata *jd)
154 /* get required compiler data */
159 cd->mcodebase = DMNEW(u1, MCODEINITSIZE);
160 cd->mcodeend = cd->mcodebase + MCODEINITSIZE;
161 cd->mcodesize = MCODEINITSIZE;
163 /* initialize mcode variables */
165 cd->mcodeptr = cd->mcodebase;
166 cd->lastmcodeptr = cd->mcodebase;
168 #if defined(ENABLE_INTRP)
169 /* native dynamic superinstructions variables */
172 cd->ncodebase = DMNEW(u1, NCODEINITSIZE);
173 cd->ncodesize = NCODEINITSIZE;
175 /* initialize ncode variables */
177 cd->ncodeptr = cd->ncodebase;
179 cd->lastinstwithoutdispatch = ~0; /* no inst without dispatch */
180 cd->superstarts = NULL;
187 cd->jumpreferences = NULL;
189 #if defined(__I386__) || defined(__X86_64__) || defined(__XDSPCORE__) || defined(ENABLE_INTRP)
190 cd->datareferences = NULL;
193 cd->exceptionrefs = NULL;
194 /* cd->patchrefs = list_create_dump(OFFSET(patchref, linkage)); */
195 cd->patchrefs = NULL;
197 cd->linenumberreferences = NULL;
198 cd->linenumbertablesizepos = 0;
199 cd->linenumbertablestartpos = 0;
200 cd->linenumbertab = 0;
204 cd->maxstack = m->maxstack;
206 #if defined(ENABLE_THREADS)
207 cd->threadcritcurrent.next = NULL;
208 cd->threadcritcount = 0;
213 /* codegen_close ***************************************************************
217 *******************************************************************************/
219 void codegen_close(void)
221 /* TODO: release avl tree on i386 and x86_64 */
225 /* codegen_increase ************************************************************
229 *******************************************************************************/
231 void codegen_increase(codegendata *cd)
235 /* save old mcodebase pointer */
237 oldmcodebase = cd->mcodebase;
239 /* reallocate to new, doubled memory */
241 cd->mcodebase = DMREALLOC(cd->mcodebase,
246 cd->mcodeend = cd->mcodebase + cd->mcodesize;
248 /* set new mcodeptr */
250 cd->mcodeptr = cd->mcodebase + (cd->mcodeptr - oldmcodebase);
252 #if defined(__I386__) || defined(__MIPS__) || defined(__X86_64__) || defined(ENABLE_INTRP)
253 /* adjust the pointer to the last patcher position */
255 if (cd->lastmcodeptr != NULL)
256 cd->lastmcodeptr = cd->mcodebase + (cd->lastmcodeptr - oldmcodebase);
261 /* codegen_ncode_increase ******************************************************
265 *******************************************************************************/
267 #if defined(ENABLE_INTRP)
268 u1 *codegen_ncode_increase(codegendata *cd, u1 *ncodeptr)
272 /* save old ncodebase pointer */
274 oldncodebase = cd->ncodebase;
276 /* reallocate to new, doubled memory */
278 cd->ncodebase = DMREALLOC(cd->ncodebase,
284 /* return the new ncodeptr */
286 return (cd->ncodebase + (ncodeptr - oldncodebase));
291 /* codegen_add_branch_ref ******************************************************
293 Prepends an branch to the list.
295 *******************************************************************************/
297 void codegen_add_branch_ref(codegendata *cd, basicblock *target)
301 /* calculate the mpc of the branch instruction */
303 branchmpc = cd->mcodeptr - cd->mcodebase;
305 #if defined(ENABLE_JIT)
306 /* Check if the target basicblock has already a start pc, so the
307 jump is backward and we can resolve it immediately. */
309 if ((target->mpc >= 0)
310 # if defined(ENABLE_INTRP)
311 /* The interpreter uses absolute branches, so we do branch
312 resolving after the code and data segment move. */
318 md_codegen_patch_branch(cd, branchmpc, target->mpc);
323 branchref *br = DNEW(branchref);
325 br->branchpos = branchmpc;
326 br->next = target->branchrefs;
328 target->branchrefs = br;
333 /* codegen_resolve_branchrefs **************************************************
335 Resolves and patches the branch references of a given basic block.
337 *******************************************************************************/
339 void codegen_resolve_branchrefs(codegendata *cd, basicblock *bptr)
347 targetmpc = bptr->mpc;
349 for (br = bptr->branchrefs; br != NULL; br = br->next) {
350 branchmpc = br->branchpos;
352 md_codegen_patch_branch(cd, branchmpc, targetmpc);
357 /* codegen_add_exception_ref ***************************************************
359 Prepends an exception branch to the list.
361 *******************************************************************************/
363 static void codegen_add_exception_ref(codegendata *cd, s4 reg,
364 functionptr function)
369 branchmpc = cd->mcodeptr - cd->mcodebase;
371 er = DNEW(exceptionref);
373 er->branchpos = branchmpc;
375 er->function = function;
377 er->next = cd->exceptionrefs;
379 cd->exceptionrefs = er;
383 /* codegen_add_arithmeticexception_ref *****************************************
385 Adds an ArithmeticException branch to the list.
387 *******************************************************************************/
389 void codegen_add_arithmeticexception_ref(codegendata *cd)
391 codegen_add_exception_ref(cd, -1, STACKTRACE_inline_arithmeticexception);
395 /* codegen_add_arrayindexoutofboundsexception_ref ******************************
397 Adds an ArrayIndexOutOfBoundsException branch to the list.
399 *******************************************************************************/
401 void codegen_add_arrayindexoutofboundsexception_ref(codegendata *cd, s4 reg)
403 codegen_add_exception_ref(cd, reg,
404 STACKTRACE_inline_arrayindexoutofboundsexception);
408 /* codegen_add_arraystoreexception_ref *****************************************
410 Adds an ArrayStoreException branch to the list.
412 *******************************************************************************/
414 void codegen_add_arraystoreexception_ref(codegendata *cd)
416 codegen_add_exception_ref(cd, -1, STACKTRACE_inline_arraystoreexception);
420 /* codegen_add_classcastexception_ref ******************************************
422 Adds an ClassCastException branch to the list.
424 *******************************************************************************/
426 void codegen_add_classcastexception_ref(codegendata *cd, s4 reg)
428 codegen_add_exception_ref(cd, reg, STACKTRACE_inline_classcastexception);
432 /* codegen_add_nullpointerexception_ref ****************************************
434 Adds an NullPointerException branch to the list.
436 *******************************************************************************/
438 void codegen_add_nullpointerexception_ref(codegendata *cd)
440 codegen_add_exception_ref(cd, -1, STACKTRACE_inline_nullpointerexception);
444 /* codegen_add_fillinstacktrace_ref ********************************************
446 Adds a fillInStackTrace branch to the list.
448 *******************************************************************************/
450 void codegen_add_fillinstacktrace_ref(codegendata *cd)
452 codegen_add_exception_ref(cd, -1, STACKTRACE_inline_fillInStackTrace);
456 /* codegen_add_patch_ref *******************************************************
458 Appends a new patcher reference to the list of patching positions.
460 *******************************************************************************/
462 void codegen_add_patch_ref(codegendata *cd, functionptr patcher, voidptr ref,
468 branchmpc = cd->mcodeptr - cd->mcodebase;
472 pr->branchpos = branchmpc;
474 pr->patcher = patcher;
477 /* list_add_first(cd->patchrefs, pr); */
478 pr->next = cd->patchrefs;
481 #if defined(ENABLE_JIT) && (defined(__MIPS__) || defined(__POWERPC__))
482 /* Generate NOPs for opt_shownops. */
488 #if defined(ENABLE_JIT) && (defined(__I386__) || defined(__MIPS__) || defined(__X86_64__))
489 /* On some architectures the patcher stub call instruction might
490 be longer than the actual instruction generated. On this
491 architectures we store the last patcher call position and after
492 the basic block code generation is completed, we check the
493 range and maybe generate some nop's. */
495 cd->lastmcodeptr = cd->mcodeptr + PATCHER_CALL_SIZE;
500 /* methodtree_comparator *******************************************************
502 Comparator function used for the AVL tree of methods.
504 *******************************************************************************/
506 static s4 methodtree_comparator(const void *pc, const void *element)
508 methodtree_element *mte;
509 methodtree_element *mtepc;
511 mte = (methodtree_element *) element;
512 mtepc = (methodtree_element *) pc;
514 /* compare both startpc and endpc of pc, even if they have the same value,
515 otherwise the avl_probe sometimes thinks the element is already in the
518 if ((long) mte->startpc <= (long) mtepc->startpc &&
519 (long) mtepc->startpc <= (long) mte->endpc &&
520 (long) mte->startpc <= (long) mtepc->endpc &&
521 (long) mtepc->endpc <= (long) mte->endpc) {
524 } else if ((long) mtepc->startpc < (long) mte->startpc) {
533 /* codegen_insertmethod ********************************************************
535 Insert the machine code range of a method into the AVL tree of methods.
537 *******************************************************************************/
539 void codegen_insertmethod(u1 *startpc, u1 *endpc)
541 methodtree_element *mte;
543 /* allocate new method entry */
545 mte = NEW(methodtree_element);
547 mte->startpc = startpc;
550 /* this function does not return an error, but asserts for
553 avl_insert(methodtree, mte);
557 /* codegen_get_pv_from_pc ******************************************************
559 Find the PV for the given PC by searching in the AVL tree of
562 *******************************************************************************/
564 u1 *codegen_get_pv_from_pc(u1 *pc)
566 methodtree_element mtepc;
567 methodtree_element *mte;
569 /* allocation of the search structure on the stack is much faster */
574 mte = avl_find(methodtree, &mtepc);
577 /* No method was found. Let's dump a stacktrace. */
579 log_println("We received a SIGSEGV and tried to handle it, but we were");
580 log_println("unable to find a Java method at:");
582 #if SIZEOF_VOID_P == 8
583 log_println("PC=0x%016lx", pc);
585 log_println("PC=0x%08x", pc);
588 log_println("Dumping the current stacktrace:");
590 stacktrace_dump_trace(THREADOBJECT);
592 vm_abort("Exiting...");
599 /* codegen_get_pv_from_pc_nocheck **********************************************
601 Find the PV for the given PC by searching in the AVL tree of
602 methods. This method does not check the return value and is used
605 *******************************************************************************/
607 u1 *codegen_get_pv_from_pc_nocheck(u1 *pc)
609 methodtree_element mtepc;
610 methodtree_element *mte;
612 /* allocation of the search structure on the stack is much faster */
617 mte = avl_find(methodtree, &mtepc);
626 /* codegen_finish **************************************************************
628 Finishes the code generation. A new memory, large enough for both
629 data and code, is allocated and data and code are copied together
630 to their final layout, unresolved jumps are resolved, ...
632 *******************************************************************************/
634 void codegen_finish(jitdata *jd)
639 #if defined(ENABLE_INTRP)
648 /* get required compiler data */
653 /* prevent compiler warning */
655 #if defined(ENABLE_INTRP)
659 /* calculate the code length */
661 mcodelen = (s4) (cd->mcodeptr - cd->mcodebase);
663 #if defined(ENABLE_THREADS)
664 extralen = sizeof(critical_section_node_t) * cd->threadcritcount;
669 #if defined(ENABLE_STATISTICS)
671 count_code_len += mcodelen;
672 count_data_len += cd->dseglen;
676 alignedmcodelen = MEMORY_ALIGN(mcodelen, MAX_ALIGN);
678 #if defined(ENABLE_INTRP)
680 ncodelen = cd->ncodeptr - cd->ncodebase;
682 ncodelen = 0; /* avoid compiler warning */
686 cd->dseglen = MEMORY_ALIGN(cd->dseglen, MAX_ALIGN);
687 alignedlen = alignedmcodelen + cd->dseglen;
689 #if defined(ENABLE_INTRP)
691 alignedlen += ncodelen;
695 /* allocate new memory */
697 code->mcodelength = mcodelen + cd->dseglen;
698 code->mcode = CNEW(u1, alignedlen + extralen);
700 /* set the entrypoint of the method */
702 assert(code->entrypoint == NULL);
703 code->entrypoint = epoint = (code->mcode + cd->dseglen);
705 /* fill the data segment (code->entrypoint must already be set!) */
709 /* copy code to the new location */
711 MCOPY((void *) code->entrypoint, cd->mcodebase, u1, mcodelen);
713 #if defined(ENABLE_INTRP)
714 /* relocate native dynamic superinstruction code (if any) */
717 cd->mcodebase = code->entrypoint;
720 u1 *ncodebase = code->mcode + cd->dseglen + alignedmcodelen;
722 MCOPY((void *) ncodebase, cd->ncodebase, u1, ncodelen);
724 /* flush the instruction and data caches */
726 md_cacheflush(ncodebase, ncodelen);
728 /* set some cd variables for dynamic_super_rerwite */
730 cd->ncodebase = ncodebase;
733 cd->ncodebase = NULL;
736 dynamic_super_rewrite(cd);
740 /* jump table resolving */
742 for (jr = cd->jumpreferences; jr != NULL; jr = jr->next)
743 *((functionptr *) ((ptrint) epoint + jr->tablepos)) =
744 (functionptr) ((ptrint) epoint + (ptrint) jr->target->mpc);
746 /* line number table resolving */
752 for (lr = cd->linenumberreferences; lr != NULL; lr = lr->next) {
754 target = lr->targetmpc;
755 /* if the entry contains an mcode pointer (normal case), resolve it */
756 /* (see doc/inlining_stacktrace.txt for details) */
757 if (lr->linenumber >= -2) {
758 target += (ptrint) epoint;
760 *((functionptr *) ((ptrint) epoint + (ptrint) lr->tablepos)) =
761 (functionptr) target;
764 *((functionptr *) ((ptrint) epoint + cd->linenumbertablestartpos)) =
765 (functionptr) ((ptrint) epoint + cd->linenumbertab);
767 *((ptrint *) ((ptrint) epoint + cd->linenumbertablesizepos)) = lrtlen;
770 /* replacement point resolving */
775 rp = code->rplpoints;
776 for (i=0; i<code->rplpointcount; ++i, ++rp) {
777 rp->pc = (u1*) ((ptrint) epoint + (ptrint) rp->pc);
778 rp->outcode = (u1*) ((ptrint) epoint + (ptrint) rp->outcode);
782 /* add method into methodtree to find the entrypoint */
784 codegen_insertmethod(code->entrypoint, code->entrypoint + mcodelen);
786 #if defined(__I386__) || defined(__X86_64__) || defined(__XDSPCORE__) || defined(ENABLE_INTRP)
787 /* resolve data segment references */
789 dseg_resolve_datareferences(jd);
792 #if defined(ENABLE_THREADS)
794 critical_section_node_t *n = (critical_section_node_t *) ((ptrint) code->mcode + alignedlen);
796 codegen_critical_section_t *nt = cd->threadcrit;
798 for (i = 0; i < cd->threadcritcount; i++) {
799 n->mcodebegin = (u1 *) (ptrint) code->mcode + nt->mcodebegin;
800 n->mcodeend = (u1 *) (ptrint) code->mcode + nt->mcodeend;
801 n->mcoderestart = (u1 *) (ptrint) code->mcode + nt->mcoderestart;
802 critical_register_critical_section(n);
809 /* flush the instruction and data caches */
811 md_cacheflush(code->mcode, code->mcodelength);
815 /* codegen_createnativestub ****************************************************
817 Wrapper for createnativestub.
820 the codeinfo representing the stub code.
822 *******************************************************************************/
824 codeinfo *codegen_createnativestub(functionptr f, methodinfo *m)
833 /* mark dump memory */
835 dumpsize = dump_size();
840 jd->cd = DNEW(codegendata);
841 jd->rd = DNEW(registerdata);
844 /* Allocate codeinfo memory from the heap as we need to keep them. */
846 jd->code = code_codeinfo_new(m); /* XXX check allocation */
848 /* get required compiler data */
852 /* set the flags for the current JIT run */
854 #if defined(ENABLE_PROFILING)
856 jd->flags |= JITDATA_FLAG_INSTRUMENT;
860 jd->flags |= JITDATA_FLAG_VERBOSECALL;
862 /* setup code generation stuff */
864 #if defined(ENABLE_JIT)
865 # if defined(ENABLE_INTRP)
873 /* create new method descriptor with additional native parameters */
876 nativeparams = (m->flags & ACC_STATIC) ? 2 : 1;
878 nmd = (methoddesc *) DMNEW(u1, sizeof(methoddesc) - sizeof(typedesc) +
879 md->paramcount * sizeof(typedesc) +
880 nativeparams * sizeof(typedesc));
882 nmd->paramcount = md->paramcount + nativeparams;
884 nmd->params = DMNEW(paramdesc, nmd->paramcount);
886 nmd->paramtypes[0].type = TYPE_ADR; /* add environment pointer */
888 if (m->flags & ACC_STATIC)
889 nmd->paramtypes[1].type = TYPE_ADR; /* add class pointer */
891 MCOPY(nmd->paramtypes + nativeparams, md->paramtypes, typedesc,
894 #if defined(ENABLE_JIT)
895 # if defined(ENABLE_INTRP)
901 /* generate the code */
903 #if defined(ENABLE_JIT)
904 # if defined(ENABLE_INTRP)
906 code->entrypoint = intrp_createnativestub(f, jd, nmd);
909 code->entrypoint = createnativestub(f, jd, nmd);
911 code->entrypoint = intrp_createnativestub(f, jd, nmd);
914 #if defined(ENABLE_STATISTICS)
916 count_nstub_len += code->mcodelength;
920 /* disassemble native stub */
922 if (opt_shownativestub) {
923 #if defined(ENABLE_DISASSEMBLER)
924 codegen_disassemble_nativestub(m,
925 (u1 *) (ptrint) code->entrypoint,
926 (u1 *) (ptrint) code->entrypoint + (code->mcodelength - jd->cd->dseglen));
929 /* show data segment */
931 if (opt_showddatasegment)
934 #endif /* !defined(NDEBUG) */
938 dump_release(dumpsize);
940 /* return native stub code */
946 /* codegen_disassemble_nativestub **********************************************
948 Disassembles the generated native stub.
950 *******************************************************************************/
952 #if defined(ENABLE_DISASSEMBLER)
953 void codegen_disassemble_nativestub(methodinfo *m, u1 *start, u1 *end)
955 printf("Native stub: ");
956 utf_fprint_printable_ascii_classname(stdout, m->class->name);
958 utf_fprint_printable_ascii(stdout, m->name);
959 utf_fprint_printable_ascii(stdout, m->descriptor);
960 printf("\n\nLength: %d\n\n", (s4) (end - start));
962 DISASSEMBLE(start, end);
967 /* codegen_start_native_call ***************************************************
969 Prepares the stuff required for a native (JNI) function call:
971 - adds a stackframe info structure to the chain, for stacktraces
972 - prepares the local references table on the stack
974 The layout of the native stub stackframe should look like this:
976 +---------------------------+ <- SP (of parent Java function)
978 +---------------------------+
980 | stackframe info structure |
982 +---------------------------+
984 | local references table |
986 +---------------------------+
988 | arguments (if any) |
990 +---------------------------+ <- SP (native stub)
992 *******************************************************************************/
994 void codegen_start_native_call(u1 *datasp, u1 *pv, u1 *sp, u1 *ra)
999 /* get data structures from stack */
1001 sfi = (stackframeinfo *) (datasp - sizeof(stackframeinfo));
1002 lrt = (localref_table *) (datasp - sizeof(stackframeinfo) -
1003 sizeof(localref_table));
1005 /* add a stackframeinfo to the chain */
1007 stacktrace_create_native_stackframeinfo(sfi, pv, sp, ra);
1009 /* add current JNI local references table to this thread */
1011 lrt->capacity = LOCALREFTABLE_CAPACITY;
1013 lrt->localframes = 1;
1014 lrt->prev = LOCALREFTABLE;
1016 /* clear the references array (memset is faster the a for-loop) */
1018 MSET(lrt->refs, 0, java_objectheader*, LOCALREFTABLE_CAPACITY);
1020 LOCALREFTABLE = lrt;
1024 /* codegen_finish_native_call **************************************************
1026 Removes the stuff required for a native (JNI) function call.
1027 Additionally it checks for an exceptions and in case, get the
1028 exception object and clear the pointer.
1030 *******************************************************************************/
1032 java_objectheader *codegen_finish_native_call(u1 *datasp)
1034 stackframeinfo *sfi;
1035 stackframeinfo **psfi;
1036 localref_table *lrt;
1037 localref_table *plrt;
1039 java_objectheader *e;
1041 /* get data structures from stack */
1043 sfi = (stackframeinfo *) (datasp - sizeof(stackframeinfo));
1044 lrt = (localref_table *) (datasp - sizeof(stackframeinfo) -
1045 sizeof(localref_table));
1047 /* remove current stackframeinfo from chain */
1049 psfi = STACKFRAMEINFO;
1053 /* release JNI local references tables for this thread */
1055 lrt = LOCALREFTABLE;
1057 /* release all current local frames */
1059 for (localframes = lrt->localframes; localframes >= 1; localframes--) {
1060 /* get previous frame */
1064 /* Clear all reference entries (only for tables allocated on
1067 if (localframes > 1)
1068 MSET(&lrt->refs[0], 0, java_objectheader*, lrt->capacity);
1072 /* set new local references table */
1077 /* now store the previous local frames in the thread structure */
1079 LOCALREFTABLE = lrt;
1081 /* get the exception and return it */
1083 e = exceptions_get_and_clear_exception();
1089 /* removecompilerstub **********************************************************
1091 Deletes a compilerstub from memory (simply by freeing it).
1093 *******************************************************************************/
1095 void removecompilerstub(u1 *stub)
1097 /* pass size 1 to keep the intern function happy */
1099 CFREE((void *) stub, 1);
1103 /* removenativestub ************************************************************
1105 Removes a previously created native-stub from memory.
1107 *******************************************************************************/
1109 void removenativestub(u1 *stub)
1111 /* pass size 1 to keep the intern function happy */
1113 CFREE((void *) stub, 1);
1117 /* codegen_reg_of_var **********************************************************
1119 This function determines a register, to which the result of an
1120 operation should go, when it is ultimatively intended to store the
1121 result in pseudoregister v. If v is assigned to an actual
1122 register, this register will be returned. Otherwise (when v is
1123 spilled) this function returns tempregnum. If not already done,
1124 regoff and flags are set in the stack location.
1126 On ARM we have to check if a long/double variable is splitted
1127 across reg/stack (HIGH_REG == REG_SPLIT). We return the actual
1128 register of v for LOW_REG and the tempregnum for HIGH_REG in such
1129 cases. (michi 2005/07/24)
1131 *******************************************************************************/
1133 s4 codegen_reg_of_var(u2 opcode, varinfo *v, s4 tempregnum)
1137 /* Do we have to generate a conditional move? Yes, then always
1138 return the temporary register. The real register is identified
1139 during the store. */
1141 if (opcode & ICMD_CONDITION_MASK)
1145 if (!(v->flags & INMEMORY)) {
1146 #if defined(__ARM__) && defined(__ARMEL__)
1147 if (IS_2_WORD_TYPE(v->type) && (GET_HIGH_REG(v->vv.regoff) == REG_SPLIT))
1148 return PACK_REGS(GET_LOW_REG(v->vv.regoff),
1149 GET_HIGH_REG(tempregnum));
1151 #if defined(__ARM__) && defined(__ARMEB__)
1152 if (IS_2_WORD_TYPE(v->type) && (GET_LOW_REG(v->vv.regoff) == REG_SPLIT))
1153 return PACK_REGS(GET_LOW_REG(tempregnum),
1154 GET_HIGH_REG(v->vv.regoff));
1156 return v->vv.regoff;
1159 #if defined(ENABLE_STATISTICS)
1161 count_spills_read++;
1167 /* codegen_reg_of_dst **********************************************************
1169 This function determines a register, to which the result of an
1170 operation should go, when it is ultimatively intended to store the
1171 result in iptr->dst.var. If dst.var is assigned to an actual
1172 register, this register will be returned. Otherwise (when it is
1173 spilled) this function returns tempregnum. If not already done,
1174 regoff and flags are set in the stack location.
1176 On ARM we have to check if a long/double variable is splitted
1177 across reg/stack (HIGH_REG == REG_SPLIT). We return the actual
1178 register of dst.var for LOW_REG and the tempregnum for HIGH_REG in such
1179 cases. (michi 2005/07/24)
1181 *******************************************************************************/
1183 s4 codegen_reg_of_dst(jitdata *jd, instruction *iptr, s4 tempregnum)
1185 return codegen_reg_of_var(iptr->opc, VAROP(iptr->dst), tempregnum);
1189 #if defined(ENABLE_THREADS)
1190 void codegen_threadcritrestart(codegendata *cd, int offset)
1192 cd->threadcritcurrent.mcoderestart = offset;
1196 void codegen_threadcritstart(codegendata *cd, int offset)
1198 cd->threadcritcurrent.mcodebegin = offset;
1202 void codegen_threadcritstop(codegendata *cd, int offset)
1204 cd->threadcritcurrent.next = cd->threadcrit;
1205 cd->threadcritcurrent.mcodeend = offset;
1206 cd->threadcrit = DNEW(codegen_critical_section_t);
1207 *(cd->threadcrit) = cd->threadcritcurrent;
1208 cd->threadcritcount++;
1214 * These are local overrides for various environment variables in Emacs.
1215 * Please do not remove this and leave it at the end of the file, where
1216 * Emacs will automagically detect them.
1217 * ---------------------------------------------------------------------
1220 * indent-tabs-mode: t
1224 * vim:noexpandtab:sw=4:ts=4: