/* src/vm/jit/replace.c - on-stack replacement of methods
- Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
- C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
- E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
- J. Wenninger, Institut f. Computersprachen - TU Wien
+ Copyright (C) 1996-2005, 2006, 2007, 2008
+ CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
This file is part of CACAO.
#include "vm/types.h"
#include <assert.h>
+#include <stdint.h>
#include <stdlib.h>
#include "arch.h"
+#include "md.h"
+
+#if defined(ENABLE_GC_CACAO)
+# include "mm/cacao-gc/gc.h"
+#endif
#include "mm/memory.h"
-#include "threads/threads-common.h"
+#include "threads/thread.h"
#include "toolbox/logging.h"
#include "vm/jit/abi.h"
#include "vm/jit/asmpart.h"
#include "vm/jit/disass.h"
+#include "vm/jit/executionstate.h"
#include "vm/jit/jit.h"
-#include "vm/jit/md.h"
#include "vm/jit/methodheader.h"
#include "vm/jit/replace.h"
#include "vm/jit/show.h"
#if !defined(NDEBUG)
static void java_value_print(s4 type, replace_val_t value);
-static void replace_stackframeinfo_println(stackframeinfo *sfi);
+static void replace_stackframeinfo_println(stackframeinfo_t *sfi);
#endif
#if !defined(NDEBUG)
m = code->m;
- /* set codeinfo flags */
-
- if (jd->isleafmethod)
- CODE_SETFLAG_LEAFMETHOD(code);
-
/* in instance methods, we may need a rplpoint at the method entry */
#if defined(REPLACE_PATCH_DYNAMIC_CALL)
for (; iptr != iend; ++iptr) {
switch (iptr->opc) {
+#if defined(ENABLE_GC_CACAO)
+ case ICMD_BUILTIN:
+ md = iptr->sx.s23.s3.bte->md;
+ count++;
+ COUNT_javalocals(javalocals, m, alloccount);
+ alloccount += iptr->s1.argcount;
+ if (iinfo)
+ alloccount -= iinfo->throughcount;
+ break;
+#endif
+
case ICMD_INVOKESTATIC:
case ICMD_INVOKESPECIAL:
case ICMD_INVOKEVIRTUAL:
for (; iptr != iend; ++iptr) {
switch (iptr->opc) {
+#if defined(ENABLE_GC_CACAO)
+ case ICMD_BUILTIN:
+ md = iptr->sx.s23.s3.bte->md;
+
+ i = (iinfo) ? iinfo->throughcount : 0;
+ replace_create_replacement_point(jd, iinfo, rp++,
+ RPLPOINT_TYPE_CALL, iptr, &ra,
+ javalocals, iptr->sx.s23.s2.args,
+ iptr->s1.argcount - i,
+ md->paramcount);
+ break;
+#endif
+
case ICMD_INVOKESTATIC:
case ICMD_INVOKESPECIAL:
case ICMD_INVOKEVIRTUAL:
rplpoint *rp;
s4 i;
s4 count;
- s4 index;
u1 *savedmcode;
assert(code->savedmcode == NULL);
/* count trappable replacement points */
count = 0;
- index = 0;
i = code->rplpointcount;
rp = code->rplpoints;
for (; i--; rp++) {
if (rp->flags & RPLPOINT_FLAG_NOTRAP)
continue;
- index++;
-
if (mappable && (rp->type == RPLPOINT_TYPE_RETURN))
continue;
if (rp->flags & RPLPOINT_FLAG_NOTRAP)
continue;
- index--;
-
if (mappable && (rp->type == RPLPOINT_TYPE_RETURN))
continue;
savedmcode -= REPLACEMENT_PATCH_SIZE;
-#if (defined(__I386__) || defined(__X86_64__) || defined(__ALPHA__) || defined(__POWERPC__) || defined(__MIPS__) || defined(__S390__)) && defined(ENABLE_JIT)
- md_patch_replacement_point(code, index, rp, savedmcode);
+#if defined(ENABLE_JIT)
+# if defined(ENABLE_DISASSEMBLER)
+ DOLOG( printf("\tinstruction before: ");
+ disassinstr(rp->pc); fflush(stdout); );
+# endif
+
+ md_patch_replacement_point(rp->pc, savedmcode, false);
+
+# if defined(ENABLE_DISASSEMBLER)
+ DOLOG( printf("\tinstruction after : ");
+ disassinstr(rp->pc); fflush(stdout); );
+# endif
#endif
+
rp->flags |= RPLPOINT_FLAG_ACTIVE;
}
DOLOG( printf("deactivate replacement point:\n");
replace_replacement_point_println(rp, 1); fflush(stdout); );
-#if (defined(__I386__) || defined(__X86_64__) || defined(__ALPHA__) || defined(__POWERPC__) || defined(__MIPS__) || defined(__S390__)) && defined(ENABLE_JIT)
- md_patch_replacement_point(code, -1, rp, savedmcode);
+#if defined(ENABLE_JIT)
+# if defined(ENABLE_DISASSEMBLER)
+ DOLOG( printf("\tinstruction before: ");
+ disassinstr(rp->pc); fflush(stdout); );
+# endif
+
+ md_patch_replacement_point(rp->pc, savedmcode, true);
+
+# if defined(ENABLE_DISASSEMBLER)
+ DOLOG( printf("\tinstruction before: ");
+ disassinstr(rp->pc); fflush(stdout); );
+# endif
#endif
rp->flags &= ~RPLPOINT_FLAG_ACTIVE;
/* read the return address */
#if defined(REPLACE_LEAFMETHODS_RA_REGISTER)
- if (CODE_IS_LEAFMETHOD(es->code))
+ if (code_is_leafmethod(es->code))
ra = (u1*) (ptrint) es->intregs[REPLACE_REG_RA];
else
#endif
ra = md_stacktrace_get_returnaddress(es->sp,
SIZE_OF_STACKSLOT * es->code->stackframesize);
- DOLOG( printf("return address: %p\n", (void*)ra); );
+ DOLOG( printf("RA = %p\n", (void*)ra); );
assert(ra);
#if defined(REPLACE_RA_TOP_OF_FRAME)
#if defined(REPLACE_LEAFMETHODS_RA_REGISTER)
- if (!CODE_IS_LEAFMETHOD(es->code))
+ if (!code_is_leafmethod(es->code))
#endif
es->intregs[REPLACE_REG_RA] = *--basesp;
#endif /* REPLACE_RA_TOP_OF_FRAME */
#if defined(REPLACE_RA_LINKAGE_AREA)
#if defined(REPLACE_LEAFMETHODS_RA_REGISTER)
- if (!CODE_IS_LEAFMETHOD(es->code))
+ if (!code_is_leafmethod(es->code))
#endif
es->intregs[REPLACE_REG_RA] = basesp[LA_LR_OFFSET / sizeof(stackslot_t)];
#endif /* REPLACE_RA_LINKAGE_AREA */
/* find the new codeinfo */
pv = md_codegen_get_pv_from_pc(ra);
-
DOLOG( printf("PV = %p\n", (void*) pv); );
- if (pv == NULL) /* XXX can this really happen? */
- return NULL;
-
- code = *(codeinfo **)(pv + CodeinfoPointer);
-
+ code = code_get_codeinfo_for_pv(pv);
DOLOG( printf("CODE = %p\n", (void*) code); );
/* return NULL if we reached native code */
(void*) *mpp, (void*)entrypoint); );
#if !defined(NDEBUG)
- oldcode = *(codeinfo **)((u1*)(*mpp) + CodeinfoPointer);
- newcode = *(codeinfo **)((u1*)(entrypoint) + CodeinfoPointer);
+ oldcode = code_get_codeinfo_for_pv(*mpp);
+ newcode = code_get_codeinfo_for_pv(entrypoint);
DOLOG_SHORT( printf("\tpatch %s %p ", kind, (void*) oldcode);
method_println(oldcode->m);
u1 *entrypoint;
};
-#define CODEINFO_OF_CODE(entrypoint) \
- (*(codeinfo **)((u1*)(entrypoint) + CodeinfoPointer))
-
-#define METHOD_OF_CODE(entrypoint) \
- (CODEINFO_OF_CODE(entrypoint)->m)
-
void replace_patch_callback(classinfo *c, struct replace_patch_data_t *pd)
{
vftbl_t *vftbl = c->vftbl;
if (vftbl != NULL
&& vftbl->vftbllength > pd->m->vftblindex
&& vftbl->table[pd->m->vftblindex] != &asm_abstractmethoderror
- && METHOD_OF_CODE(vftbl->table[pd->m->vftblindex]) == pd->m)
+ && code_get_methodinfo_for_pv(vftbl->table[pd->m->vftblindex]) == pd->m)
{
replace_patch_class(c->vftbl, pd->m, pd->oldentrypoint, pd->entrypoint);
}
sourceframe_t *callerframe,
sourceframe_t *calleeframe)
{
- u1 *patchpos;
- methodptr entrypoint;
- methodptr oldentrypoint;
- bool atentry;
- stackframeinfo sfi;
- codeinfo *calleecode;
- methodinfo *calleem;
- java_object_t *obj;
- vftbl_t *vftbl;
+ u1 *patchpos;
+ methodptr entrypoint;
+ methodptr oldentrypoint;
+ bool atentry;
+ void *pv;
+ codeinfo *calleecode;
+ methodinfo *calleem;
+ java_object_t *obj;
+ vftbl_t *vftbl;
assert(ra);
assert(callerframe->down == calleeframe);
/* get the position to patch, in case it was a statically bound call */
- sfi.pv = callerframe->fromcode->entrypoint;
- patchpos = md_get_method_patch_address(ra, &sfi, NULL);
+ pv = callerframe->fromcode->entrypoint;
+ patchpos = md_jit_method_patch_address(pv, ra, NULL);
if (patchpos == NULL) {
/* the call was dispatched dynamically */
obj = calleeframe->instance.a;
vftbl = obj->vftbl;
- assert(vftbl->class->vftbl == vftbl);
+ assert(vftbl->clazz->vftbl == vftbl);
- DOLOG_SHORT( printf("\tclass: "); class_println(vftbl->class); );
+ DOLOG_SHORT( printf("\tclass: "); class_println(vftbl->clazz); );
replace_patch_class(vftbl, calleem, oldentrypoint, entrypoint);
}
#if defined(REPLACE_RA_TOP_OF_FRAME)
#if defined(REPLACE_LEAFMETHODS_RA_REGISTER)
- if (!CODE_IS_LEAFMETHOD(calleecode))
+ if (!code_is_leafmethod(calleecode))
#endif
*--basesp = (ptrint) ra;
#endif /* REPLACE_RA_TOP_OF_FRAME */
#if defined(REPLACE_RA_LINKAGE_AREA)
#if defined(REPLACE_LEAFMETHODS_RA_REGISTER)
- if (!CODE_IS_LEAFMETHOD(calleecode))
+ if (!code_is_leafmethod(calleecode))
#endif
basesp[LA_LR_OFFSET / sizeof(stackslot_t)] = (ptrint) ra;
#endif /* REPLACE_RA_LINKAGE_AREA */
/* replace_find_replacement_point_for_pc ***************************************
- Find the nearest replacement point at or before the given PC.
+ Find the nearest replacement point at or before the given PC. The
+ given PC has to be between (rp->pc) and (rp->pc+rp->callsize) for
+ the replacement point to be found.
IN:
code.............compilation unit the PC is in
rplpoint *rp;
s4 i;
- DOLOG( printf("searching for rp in %p ", (void*)code);
+ DOLOG( printf("searching for rp at pc:%p in %p ", (void*)pc, (void*)code);
method_println(code->m); );
found = NULL;
rp = code->rplpoints;
for (i=0; i<code->rplpointcount; ++i, ++rp) {
DOLOG( replace_replacement_point_println(rp, 2); );
- if (rp->pc <= pc)
+ if (rp->pc <= pc && rp->pc + rp->callsize >= pc)
found = rp;
}
static void replace_pop_native_frame(executionstate_t *es,
sourcestate_t *ss,
- stackframeinfo *sfi)
+ stackframeinfo_t *sfi)
{
sourceframe_t *frame;
codeinfo *code;
/* remember pc and size of native frame */
frame->nativepc = es->pc;
- frame->nativeframesize = sfi->sp - es->sp;
+ frame->nativeframesize = (es->sp != 0) ? (sfi->sp - es->sp) : 0;
assert(frame->nativeframesize >= 0);
/* remember values of saved registers */
/* restore saved registers */
-#if 0
+#if defined(ENABLE_GC_CACAO) && !defined(HAS_ADDRESS_REGISTER_FILE)
+ j = 0;
+ for (i=0; i<INT_REG_CNT; ++i) {
+ if (nregdescint[i] == REG_SAV)
+ es->intregs[i] = sfi->intregs[j++];
+ }
+#else
/* XXX we don't have them, yet, in the sfi, so clear them */
for (i=0; i<INT_REG_CNT; ++i) {
if (nregdescint[i] == REG_SAV)
es->intregs[i] = 0;
}
+#endif
+
+ /* XXX we don't have float registers in the sfi, so clear them */
for (i=0; i<FLT_REG_CNT; ++i) {
if (nregdescfloat[i] == REG_SAV)
es->fltregs[i] = 0.0;
}
-# if defined(HAS_ADDRESS_REGISTER_FILE)
+#if defined(HAS_ADDRESS_REGISTER_FILE)
+# if defined(ENABLE_GC_CACAO)
+ j = 0;
+ for (i=0; i<ADR_REG_CNT; ++i) {
+ if (nregdescadr[i] == REG_SAV)
+ es->adrregs[i] = sfi->adrregs[j++];
+ }
+# else
for (i=0; i<ADR_REG_CNT; ++i) {
if (nregdescadr[i] == REG_SAV)
es->adrregs[i] = 0;
# endif
#endif
- /* restore pv, pc, and sp */
+ /* restore codeinfo of the native stub */
- if (sfi->pv == NULL) {
- /* frame of a native function call */
- es->pv = md_codegen_get_pv_from_pc(sfi->ra);
- }
- else {
- es->pv = sfi->pv;
- }
- es->pc = ((sfi->xpc) ? sfi->xpc : sfi->ra) - 1;
- es->sp = sfi->sp;
-
- /* find the new codeinfo */
+ code = code_get_codeinfo_for_pv(sfi->pv);
- DOLOG( printf("PV = %p\n", (void*) es->pv); );
-
- assert(es->pv != NULL);
-
- code = *(codeinfo **)(es->pv + CodeinfoPointer);
-
- DOLOG( printf("CODE = %p\n", (void*) code); );
+ /* restore sp, pv, pc and codeinfo of the parent method */
- es->code = code;
+ /* XXX michi: use this instead:
+ es->sp = sfi->sp + code->stackframesize; */
+ es->sp = sfi->sp + (*(s4 *) (sfi->pv + FrameSize));
+#if defined(REPLACE_RA_BETWEEN_FRAMES)
+ es->sp += SIZE_OF_STACKSLOT; /* skip return address */
+#endif
+ es->pv = md_codegen_get_pv_from_pc(sfi->ra);
+ es->pc = ((sfi->xpc) ? sfi->xpc : sfi->ra) - 1;
+ es->code = code_get_codeinfo_for_pv(es->pv);
}
ss->frames = frame->down;
+ /* skip sp for the native stub */
+
+ es->sp -= (*(s4 *) (frame->sfi->pv + FrameSize));
+#if defined(REPLACE_RA_BETWEEN_FRAMES)
+ es->sp -= SIZE_OF_STACKSLOT; /* skip return address */
+#endif
+
/* assert that the native frame has not moved */
assert(es->sp == frame->sfi->sp);
+ /* update saved registers in the stackframeinfo */
+
+#if defined(ENABLE_GC_CACAO)
+ j = 0;
+# if !defined(HAS_ADDRESS_REGISTER_FILE)
+ for (i=0; i<INT_REG_CNT; ++i) {
+ if (nregdescint[i] == REG_SAV)
+ frame->sfi->intregs[j++] = es->intregs[i];
+ }
+# else
+ for (i=0; i<ADR_REG_CNT; ++i) {
+ if (nregdescadr[i] == REG_SAV)
+ frame->sfi->adrregs[j++] = es->adrregs[i];
+ }
+# endif
+
+ /* XXX leave float registers untouched here */
+#endif
+
/* restore saved registers */
j = 0;
*******************************************************************************/
sourcestate_t *replace_recover_source_state(rplpoint *rp,
- stackframeinfo *sfi,
+ stackframeinfo_t *sfi,
executionstate_t *es)
{
sourcestate_t *ss;
ss = DNEW(sourcestate_t);
ss->frames = NULL;
- /* get the stackframeinfo if none is given */
-
- if (sfi == NULL)
- sfi = STACKFRAMEINFO;
-
/* each iteration of the loop recovers one source frame */
depth = 0;
while (rp || sfi) {
- DOLOG( replace_executionstate_println(es); );
+ DOLOG( executionstate_println(es); );
/* if we are not at a replacement point, it is a native frame */
rp = NULL;
+#if !defined(ENABLE_GC_CACAO)
break; /* XXX remove to activate native frames */
+#endif
continue;
}
}
-/* replace_build_execution_state_intern ****************************************
+/* replace_map_source_state_identity *******************************************
+
+ Map each source frame in the given source state to the same replacement
+ point and compilation unit it was derived from. This is mainly used for
+ garbage collection.
+
+ IN:
+ ss...............the source state
+
+ OUT:
+ ss...............the source state, modified: The `torp` and `tocode`
+ fields of each source frame are set.
+
+*******************************************************************************/
+
+#if defined(ENABLE_GC_CACAO)
+static void replace_map_source_state_identity(sourcestate_t *ss)
+{
+ sourceframe_t *frame;
+
+ /* iterate over the source frames from outermost to innermost */
+
+ for (frame = ss->frames; frame != NULL; frame = frame->down) {
+
+ /* skip native frames */
+
+ if (REPLACE_IS_NATIVE_FRAME(frame)) {
+ continue;
+ }
+
+ /* map frames using the identity mapping */
+
+ if (frame->tocode) {
+ assert(frame->tocode == frame->fromcode);
+ assert(frame->torp == frame->fromrp);
+ } else {
+ assert(frame->tocode == NULL);
+ assert(frame->torp == NULL);
+ frame->tocode = frame->fromcode;
+ frame->torp = frame->fromrp;
+ }
+ }
+}
+#endif
+
+
+/* replace_build_execution_state ***********************************************
Build an execution state for the given (mapped) source state.
*******************************************************************************/
-static void replace_build_execution_state_intern(sourcestate_t *ss,
- executionstate_t *es)
+static void replace_build_execution_state(sourcestate_t *ss,
+ executionstate_t *es)
{
rplpoint *rp;
sourceframe_t *prevframe;
replace_push_activation_record(es, rp, prevframe, ss->frames);
- DOLOG( replace_executionstate_println(es); );
+ DOLOG( executionstate_println(es); );
}
rp = ss->frames->torp;
replace_write_executionstate(rp, es, ss, ss->frames->down == NULL);
- DOLOG( replace_executionstate_println(es); );
+ DOLOG( executionstate_println(es); );
if (rp->type == RPLPOINT_TYPE_CALL) {
parent = NULL;
}
-/* replace_build_execution_state ***********************************************
-
- This function contains the final phase of replacement. It builds the new
- execution state, releases dump memory, and returns to the calling
- assembler function which finishes replacement.
-
- NOTE: This function is called from asm_replacement_in, with the stack
- pointer at the start of the safe stack area.
+/* replace_me ******************************************************************
+
+ This function is called by the signal handler when a thread reaches
+ a replacement point. `replace_me` must map the execution state to the
+ target replacement point and let execution continue there.
THIS FUNCTION MUST BE CALLED USING A SAFE STACK AREA!
- CAUTION: This function and its children must not use a lot of stack!
- There are only REPLACE_SAFESTACK_SIZE bytes of C stack
- available.
-
IN:
- st...............the safestack contained the necessary data
-
+ rp...............replacement point that has been reached
+ es...............execution state read by signal handler
+
*******************************************************************************/
-void replace_build_execution_state(replace_safestack_t *st)
+static void replace_me(rplpoint *rp, executionstate_t *es)
{
- replace_build_execution_state_intern(st->ss, &(st->es));
-
- DOLOG( replace_executionstate_println(&(st->es)); );
+ stackframeinfo_t *sfi;
+ sourcestate_t *ss;
+ sourceframe_t *frame;
+ codeinfo *origcode;
+ rplpoint *origrp;
+#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
+ threadobject *thread;
+#endif
+ int32_t dumpmarker;
- /* release dump area */
+ origcode = es->code;
+ origrp = rp;
- dump_release(st->dumpsize);
+ DOLOG_SHORT( printf("REPLACING(%d %p): (id %d %p) ",
+ stat_replacements, (void*)THREADOBJECT,
+ rp->id, (void*)rp);
+ method_println(es->code->m); );
- /* new code is entered after returning */
+ DOLOG( replace_replacement_point_println(rp, 1); );
- DOLOG( printf("JUMPING IN!\n"); fflush(stdout); );
-}
+ REPLACE_COUNT(stat_replacements);
+ /* mark start of dump memory area */
-/* replace_alloc_safestack *****************************************************
+ DMARKER;
- Allocate a safe stack area to use during the final phase of replacement.
- The returned area is not initialized. This must be done by the caller.
+ /* Get the stackframeinfo for the current thread. */
- RETURN VALUE:
- a newly allocated replace_safestack_t *
+ sfi = threads_get_current_stackframeinfo();
-*******************************************************************************/
+ /* recover source state */
-static replace_safestack_t *replace_alloc_safestack()
-{
- u1 *mem;
- replace_safestack_t *st;
+ ss = replace_recover_source_state(rp, sfi, es);
- mem = MNEW(u1, sizeof(replace_safestack_t) + REPLACE_STACK_ALIGNMENT - 1);
+#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
+ /* if there is a collection pending, we assume the replacement point should
+ suspend this thread */
- st = (replace_safestack_t *) ((ptrint)(mem + REPLACE_STACK_ALIGNMENT - 1)
- & ~(REPLACE_STACK_ALIGNMENT - 1));
+ if (gc_pending) {
-#if !defined(NDEBUG)
- memset(st, 0xa5, sizeof(replace_safestack_t));
-#endif
+ thread = THREADOBJECT;
- st->mem = mem;
+ DOLOG_SHORT( printf("REPLACEMENT: Suspending thread for GC now!\n"); );
- return st;
-}
+ /* map the sourcestate using the identity mapping */
+ replace_map_source_state_identity(ss);
+ /* since we enter the same method again, we turn off rps now */
+ /* XXX michi: can we really do this? what if the rp was active before
+ we activated it for the gc? */
+ replace_deactivate_replacement_points(origcode);
-/* replace_free_safestack ******************************************************
+ /* remember executionstate and sourcestate for this thread */
+ GC_EXECUTIONSTATE = es;
+ GC_SOURCESTATE = ss;
- Free the given safestack structure, making a copy of the contained
- execution state before freeing it.
+ /* really suspend this thread now (PC = 0) */
+ threads_suspend_ack(NULL, NULL);
- NOTE: This function is called from asm_replacement_in.
+ DOLOG_SHORT( printf("REPLACEMENT: Resuming thread after GC now!\n"); );
- IN:
- st...............the safestack to free
- tmpes............where to copy the execution state to
+ } else {
+#endif /*defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)*/
- OUT:
- *tmpes...........receives a copy of st->es
+ /* map the source state */
-*******************************************************************************/
+ if (!replace_map_source_state(ss))
+ vm_abort("exception during method replacement");
-void replace_free_safestack(replace_safestack_t *st, executionstate_t *tmpes)
-{
- u1 *mem;
+ DOLOG( replace_sourcestate_println(ss); );
- /* copy the executionstate_t to the temporary location */
+ DOLOG_SHORT( replace_sourcestate_println_short(ss); );
- *tmpes = st->es;
+#if !defined(NDEBUG)
+ /* avoid infinite loops by self-replacement, only if not in testing mode */
+
+ if (!opt_TestReplacement) {
+ frame = ss->frames;
+ while (frame->down)
+ frame = frame->down;
+
+ if (frame->torp == origrp) {
+ DOLOG_SHORT(
+ printf("WARNING: identity replacement, turning off rps to avoid infinite loop\n");
+ );
+ replace_deactivate_replacement_points(origcode);
+ }
+ }
+#endif
- /* get the memory address to free */
+#if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
+ }
+#endif
- mem = st->mem;
+ /* build the new execution state */
- /* destroy memory (in debug mode) */
+ replace_build_execution_state(ss, es);
#if !defined(NDEBUG)
- memset(st, 0xa5, sizeof(replace_safestack_t));
+ /* continue execution after patched machine code, if testing mode enabled */
+
+ if (opt_TestReplacement)
+ es->pc += REPLACEMENT_PATCH_SIZE;
#endif
- /* free the safe stack struct */
+ /* release dump area */
- MFREE(mem, u1, sizeof(replace_safestack_t) + REPLACE_STACK_ALIGNMENT - 1);
+ DRELEASE;
}
/* replace_me_wrapper **********************************************************
- TODO: Document me!
+ This function is called by the signal handler. It determines if there
+ is an active replacement point pending at the given PC and returns
+ accordingly.
+
+ THIS FUNCTION MUST BE CALLED USING A SAFE STACK AREA!
+
+ IN:
+ pc...............the program counter that triggered the replacement.
+ context..........the context (machine state) to which the
+ replacement should be applied.
+
+ OUT:
+ context..........the context after replacement finished.
+
+ RETURN VALUE:
+ true.............replacement done, everything went ok
+ false............no replacement done, context unchanged
*******************************************************************************/
-bool replace_me_wrapper(u1 *pc)
+bool replace_me_wrapper(u1 *pc, void *context)
{
codeinfo *code;
rplpoint *rp;
/* search for a replacement point at the given PC */
-#if 0
rp = replace_find_replacement_point_for_pc(code, pc);
- assert(rp == NULL || rp->pc == pc);
-#else
- {
- int i;
- rplpoint *rp2;
- rp = NULL;
- for (i=0,rp2=code->rplpoints; i<code->rplpointcount; i++,rp2++) {
- if (rp2->pc == pc)
- rp = rp2;
- }
- }
-#endif
- /* check if the replacement point is active */
+ /* check if the replacement point belongs to given PC and is active */
- if (rp != NULL && (rp->flags & RPLPOINT_FLAG_ACTIVE)) {
+ if ((rp != NULL) && (rp->pc == pc) && (rp->flags & RPLPOINT_FLAG_ACTIVE)) {
- /*md_replace_executionstate_read(&es, context);*/
+#if !defined(NDEBUG)
+ executionstate_sanity_check(context);
+#endif
- replace_me(rp, &es);
+ /* set codeinfo pointer in execution state */
- return true;
- }
- else
- return false;
-}
+ es.code = code;
+ /* read execution state from current context */
-/* replace_me ******************************************************************
-
- This function is called by asm_replacement_out when a thread reaches
- a replacement point. `replace_me` must map the execution state to the
- target replacement point and let execution continue there.
+ md_executionstate_read(&es, context);
- This function never returns!
-
- IN:
- rp...............replacement point that has been reached
- es...............execution state read by asm_replacement_out
-
-*******************************************************************************/
+ DOLOG( printf("REPLACEMENT READ: ");
+ executionstate_println(&es); );
-void replace_me(rplpoint *rp, executionstate_t *es)
-{
- sourcestate_t *ss;
- sourceframe_t *frame;
- s4 dumpsize;
- rplpoint *origrp;
- replace_safestack_t *safestack;
-
- origrp = rp;
- es->code = code_find_codeinfo_for_pc(rp->pc);
+ /* do the actual replacement */
- DOLOG_SHORT( printf("REPLACING(%d %p): (id %d %p) ",
- stat_replacements, (void*)THREADOBJECT,
- rp->id, (void*)rp);
- method_println(es->code->m); );
-
- DOLOG( replace_replacement_point_println(rp, 1);
- replace_executionstate_println(es); );
-
- REPLACE_COUNT(stat_replacements);
-
- /* mark start of dump memory area */
+ replace_me(rp, &es);
- dumpsize = dump_size();
+ /* write execution state to current context */
- /* recover source state */
+ md_executionstate_write(&es, context);
- ss = replace_recover_source_state(rp, NULL, es);
+ DOLOG( printf("REPLACEMENT WRITE: ");
+ executionstate_println(&es); );
- /* map the source state */
+ /* new code is entered after returning */
- if (!replace_map_source_state(ss))
- vm_abort("exception during method replacement");
+ DOLOG( printf("JUMPING IN!\n"); fflush(stdout); );
+ return true;
+ }
+ else
+ return false;
+}
- DOLOG( replace_sourcestate_println(ss); );
- DOLOG_SHORT( replace_sourcestate_println_short(ss); );
+/******************************************************************************/
+/* NOTE: Stuff specific to the exact GC is below. */
+/******************************************************************************/
- /* avoid infinite loops by self-replacement */
+#if defined(ENABLE_GC_CACAO)
+void replace_gc_from_native(threadobject *thread, u1 *pc, u1 *sp)
+{
+ stackframeinfo_t *sfi;
+ executionstate_t *es;
+ sourcestate_t *ss;
- frame = ss->frames;
- while (frame->down)
- frame = frame->down;
+ /* Get the stackframeinfo of this thread. */
- if (frame->torp == origrp) {
- DOLOG_SHORT(
- printf("WARNING: identity replacement, turning off rps to avoid infinite loop\n");
- );
- replace_deactivate_replacement_points(frame->tocode);
- }
+ assert(thread == THREADOBJECT);
- /* write execution state of new code */
+ sfi = threads_get_current_stackframeinfo();
- DOLOG( replace_executionstate_println(es); );
+ /* create the execution state */
+ es = DNEW(executionstate_t);
+ es->pc = pc;
+ es->sp = sp;
+ es->pv = 0; /* since we are in a native, PV is invalid! */
+ es->code = NULL; /* since we are in a native, we do not have a codeinfo */
- /* allocate a safe stack area and copy all needed data there */
+ /* we assume we are in a native (no replacement point)! */
+ ss = replace_recover_source_state(NULL, sfi, es);
- safestack = replace_alloc_safestack();
+ /* map the sourcestate using the identity mapping */
+ replace_map_source_state_identity(ss);
- safestack->es = *es;
- safestack->ss = ss;
- safestack->dumpsize = dumpsize;
+ /* remember executionstate and sourcestate for this thread */
+ GC_EXECUTIONSTATE = es;
+ GC_SOURCESTATE = ss;
+}
+#endif
- /* call the assembler code for the last phase of replacement */
+#if defined(ENABLE_GC_CACAO)
+void replace_gc_into_native(threadobject *thread)
+{
+ executionstate_t *es;
+ sourcestate_t *ss;
-#if (defined(__I386__) || defined(__X86_64__) || defined(__ALPHA__) || defined(__POWERPC__) || defined(__MIPS__) || defined(__S390__)) && defined(ENABLE_JIT)
- /*asm_replacement_in(&(safestack->es), safestack);*/
-#endif
+ /* get the executionstate and sourcestate for the given thread */
+ es = GC_EXECUTIONSTATE;
+ ss = GC_SOURCESTATE;
- abort(); /* NOT REACHED */
+ /* rebuild the stack of the given thread */
+ replace_build_execution_state(ss, es);
}
+#endif
/******************************************************************************/
#endif
-/* replace_executionstate_println **********************************************
-
- Print execution state
-
- IN:
- es...............the execution state to print
-
-*******************************************************************************/
-
-#if !defined(NDEBUG)
-void replace_executionstate_println(executionstate_t *es)
-{
- int i;
- int slots;
- stackslot_t *sp;
- int extraslots;
-
- if (!es) {
- printf("(executionstate_t *)NULL\n");
- return;
- }
-
- printf("executionstate_t:\n");
- printf("\tpc = %p",(void*)es->pc);
- printf(" sp = %p",(void*)es->sp);
- printf(" pv = %p\n",(void*)es->pv);
-#if defined(ENABLE_DISASSEMBLER)
- for (i=0; i<INT_REG_CNT; ++i) {
- if (i%4 == 0)
- printf("\t");
- else
- printf(" ");
-#if SIZEOF_VOID_P == 8
- printf("%-3s = %016llx",abi_registers_integer_name[i],(unsigned long long)es->intregs[i]);
-#else
- printf("%-3s = %08lx",abi_registers_integer_name[i],(unsigned long)es->intregs[i]);
-#endif
- if (i%4 == 3)
- printf("\n");
- }
- for (i=0; i<FLT_REG_CNT; ++i) {
- if (i%4 == 0)
- printf("\t");
- else
- printf(" ");
- printf("F%02d = %016llx",i,(unsigned long long)es->fltregs[i]);
- if (i%4 == 3)
- printf("\n");
- }
-# if defined(HAS_ADDRESS_REGISTER_FILE)
- for (i=0; i<ADR_REG_CNT; ++i) {
- if (i%4 == 0)
- printf("\t");
- else
- printf(" ");
- printf("A%02d = %016llx",i,(unsigned long long)es->adrregs[i]);
- if (i%4 == 3)
- printf("\n");
- }
-# endif
-#endif
-
- sp = (stackslot_t *) es->sp;
-
- extraslots = 2;
-
- if (es->code) {
- methoddesc *md = es->code->m->parseddesc;
- slots = es->code->stackframesize;
- extraslots = 1 + md->memuse;
- }
- else
- slots = 0;
-
-
- if (slots) {
- printf("\tstack slots(+%d) at sp:", extraslots);
- for (i=0; i<slots+extraslots; ++i) {
- if (i%4 == 0)
- printf("\n\t\t");
- printf("M%02d%c", i, (i >= slots) ? '(' : ' ');
-#ifdef HAS_4BYTE_STACKSLOT
- printf("%08lx",(unsigned long)*sp++);
-#else
- printf("%016llx",(unsigned long long)*sp++);
-#endif
- printf("%c", (i >= slots) ? ')' : ' ');
- }
- printf("\n");
- }
-
- printf("\tcode: %p", (void*)es->code);
- if (es->code != NULL) {
- printf(" stackframesize=%d ", es->code->stackframesize);
- method_print(es->code->m);
- }
- printf("\n");
-
- printf("\n");
-}
-#endif
-
#if !defined(NDEBUG)
static void java_value_print(s4 type, replace_val_t value)
{
if (type == TYPE_ADR && value.a != NULL) {
obj = value.a;
putchar(' ');
- utf_display_printable_ascii_classname(obj->vftbl->class->name);
+ utf_display_printable_ascii_classname(obj->vftbl->clazz->name);
- if (obj->vftbl->class == class_java_lang_String) {
+ if (obj->vftbl->clazz == class_java_lang_String) {
printf(" \"");
u = javastring_toutf(obj, false);
utf_display_printable_ascii(u);
if (REPLACE_IS_NATIVE_FRAME(frame)) {
printf("NATIVE (pc %p size %d) ",
- (void*)frame->nativepc, frame->nativeframesize);
+ (void*)frame->nativepc, frame->nativeframesize);
replace_stackframeinfo_println(frame->sfi);
continue;
}
#endif
#if !defined(NDEBUG)
-static void replace_stackframeinfo_println(stackframeinfo *sfi)
+static void replace_stackframeinfo_println(stackframeinfo_t *sfi)
{
printf("prev=%p pv=%p sp=%p ra=%p xpc=%p method=",
(void*)sfi->prev, (void*)sfi->pv, (void*)sfi->sp,
(void*)sfi->ra, (void*)sfi->xpc);
- if (sfi->method)
- method_println(sfi->method);
+ if (sfi->code)
+ method_println(sfi->code->m);
else
printf("(nil)\n");
}
#endif
+
/*
* These are local overrides for various environment variables in Emacs.
* Please do not remove this and leave it at the end of the file, where
projects / cacao.git / blobdiff