mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-19 02:49:05 +08:00
368 lines
10 KiB
C++
368 lines
10 KiB
C++
// boehm.cc - interface between libjava and Boehm GC.
|
||
|
||
/* Copyright (C) 1998, 1999 Cygnus Solutions
|
||
|
||
This file is part of libgcj.
|
||
|
||
This software is copyrighted work licensed under the terms of the
|
||
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
||
details. */
|
||
|
||
#include <config.h>
|
||
|
||
#include <stdio.h>
|
||
|
||
#include <cni.h>
|
||
#include <java/lang/Class.h>
|
||
#include <jvm.h>
|
||
#include <java-field.h>
|
||
|
||
// We need to include gc_priv.h. However, it tries to include
|
||
// config.h if it hasn't already been included. So we force the
|
||
// inclusion of the Boehm config.h.
|
||
extern "C"
|
||
{
|
||
#include <boehm-config.h>
|
||
#include <gc_priv.h>
|
||
#include <gc_mark.h>
|
||
|
||
// These aren't declared in any Boehm GC header.
|
||
void GC_finalize_all (void);
|
||
ptr_t GC_debug_generic_malloc (size_t size, int k, GC_EXTRA_PARAMS);
|
||
};
|
||
|
||
// FIXME: this should probably be defined in some GC header.
|
||
#ifdef GC_DEBUG
|
||
# define GC_GENERIC_MALLOC(Size, Type) \
|
||
GC_debug_generic_malloc (Size, Type, GC_EXTRAS)
|
||
#else
|
||
# define GC_GENERIC_MALLOC(Size, Type) GC_generic_malloc (Size, Type)
|
||
#endif
|
||
|
||
// We must check for plausibility ourselves.
|
||
#define MAYBE_MARK(Obj, Top, Limit, Source, Exit) \
|
||
if ((ptr_t) (Obj) >= GC_least_plausible_heap_addr \
|
||
&& (ptr_t) (Obj) <= GC_greatest_plausible_heap_addr) \
|
||
PUSH_CONTENTS (Obj, Top, Limit, Source, Exit)
|
||
|
||
#define ObjectClass _CL_Q34java4lang6Object
|
||
extern java::lang::Class ObjectClass;
|
||
#define ClassClass _CL_Q34java4lang5Class
|
||
extern java::lang::Class ClassClass;
|
||
|
||
|
||
|
||
// Nonzero if this module has been initialized.
|
||
static int initialized = 0;
|
||
|
||
// `kind' index used when allocating Java objects.
|
||
static int obj_kind_x;
|
||
|
||
// `kind' index used when allocating Java arrays.
|
||
static int array_kind_x;
|
||
|
||
// Freelist used for Java objects.
|
||
static ptr_t *obj_free_list;
|
||
|
||
// Freelist used for Java arrays.
|
||
static ptr_t *array_free_list;
|
||
|
||
|
||
|
||
// This is called by the GC during the mark phase. It marks a Java
|
||
// object. We use `void *' arguments and return, and not what the
|
||
// Boehm GC wants, to avoid pollution in our headers.
|
||
void *
|
||
_Jv_MarkObj (void *addr, void *msp, void *msl, void * /*env*/)
|
||
{
|
||
mse *mark_stack_ptr = (mse *) msp;
|
||
mse *mark_stack_limit = (mse *) msl;
|
||
jobject obj = (jobject) addr;
|
||
|
||
_Jv_VTable *dt = *(_Jv_VTable **) addr;
|
||
// We check this in case a GC occurs before the vtbl is set. FIXME:
|
||
// should use allocation lock while initializing object.
|
||
if (! dt)
|
||
return mark_stack_ptr;
|
||
jclass klass = dt->clas;
|
||
|
||
// Every object has a sync_info pointer.
|
||
word w = (word) obj->sync_info;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, obj, o1label);
|
||
// Mark the object's class.
|
||
w = (word) klass;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, obj, o2label);
|
||
|
||
if (klass == &ClassClass)
|
||
{
|
||
jclass c = (jclass) addr;
|
||
|
||
w = (word) c->next;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c2label);
|
||
w = (word) c->name;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c3label);
|
||
w = (word) c->superclass;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c4label);
|
||
for (int i = 0; i < c->constants.size; ++i)
|
||
{
|
||
w = (word) c->constants.data[i];
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c5label);
|
||
}
|
||
|
||
// If the class is an array, then the methods field holds a
|
||
// pointer to the element class. If the class is primitive,
|
||
// then the methods field holds a pointer to the array class.
|
||
w = (word) c->methods;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c6label);
|
||
|
||
if (! c->isArray() && ! c->isPrimitive())
|
||
{
|
||
// Scan each method in the cases where `methods' really
|
||
// points to a methods structure.
|
||
for (int i = 0; i < c->method_count; ++i)
|
||
{
|
||
w = (word) c->methods[i].name;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c,
|
||
cm1label);
|
||
w = (word) c->methods[i].signature;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c,
|
||
cm2label);
|
||
// FIXME: `ncode' entry?
|
||
}
|
||
}
|
||
|
||
// Mark all the fields.
|
||
w = (word) c->fields;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c8label);
|
||
for (int i = 0; i < c->field_count; ++i)
|
||
{
|
||
#ifndef COMPACT_FIELDS
|
||
w = (word) c->fields[i].name;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c8alabel);
|
||
#endif
|
||
w = (word) c->fields[i].type;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c8blabel);
|
||
}
|
||
|
||
w = (word) c->vtable;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, c9label);
|
||
w = (word) c->interfaces;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, cAlabel);
|
||
for (int i = 0; i < c->interface_count; ++i)
|
||
{
|
||
w = (word) c->interfaces[i];
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, cClabel);
|
||
}
|
||
w = (word) c->loader;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, c, cBlabel);
|
||
}
|
||
else
|
||
{
|
||
// NOTE: each class only holds information about the class
|
||
// itself. So we must do the marking for the entire inheritance
|
||
// tree in order to mark all fields. FIXME: what about
|
||
// interfaces? We skip Object here, because Object only has a
|
||
// sync_info, and we handled that earlier.
|
||
// Note: occasionally `klass' can be null. For instance, this
|
||
// can happen if a GC occurs between the point where an object
|
||
// is allocated and where the vtbl slot is set.
|
||
while (klass && klass != &ObjectClass)
|
||
{
|
||
jfieldID field = JvGetFirstInstanceField (klass);
|
||
jint max = JvNumInstanceFields (klass);
|
||
|
||
for (int i = 0; i < max; ++i)
|
||
{
|
||
if (JvFieldIsRef (field))
|
||
{
|
||
jobject val = JvGetObjectField (obj, field);
|
||
w = (word) val;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit,
|
||
obj, elabel);
|
||
}
|
||
field = field->getNextInstanceField ();
|
||
}
|
||
klass = klass->getSuperclass();
|
||
}
|
||
}
|
||
|
||
return mark_stack_ptr;
|
||
}
|
||
|
||
// This is called by the GC during the mark phase. It marks a Java
|
||
// array (of objects). We use `void *' arguments and return, and not
|
||
// what the Boehm GC wants, to avoid pollution in our headers.
|
||
void *
|
||
_Jv_MarkArray (void *addr, void *msp, void *msl, void * /*env*/)
|
||
{
|
||
mse *mark_stack_ptr = (mse *) msp;
|
||
mse *mark_stack_limit = (mse *) msl;
|
||
jobjectArray array = (jobjectArray) addr;
|
||
|
||
_Jv_VTable *dt = *(_Jv_VTable **) addr;
|
||
// We check this in case a GC occurs before the vtbl is set. FIXME:
|
||
// should use allocation lock while initializing object.
|
||
if (! dt)
|
||
return mark_stack_ptr;
|
||
jclass klass = dt->clas;
|
||
|
||
// Every object has a sync_info pointer.
|
||
word w = (word) array->sync_info;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, array, e1label);
|
||
// Mark the object's class.
|
||
w = (word) klass;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, obj, o2label);
|
||
|
||
for (int i = 0; i < JvGetArrayLength (array); ++i)
|
||
{
|
||
jobject obj = elements (array)[i];
|
||
w = (word) obj;
|
||
MAYBE_MARK (w, mark_stack_ptr, mark_stack_limit, array, e2label);
|
||
}
|
||
|
||
return mark_stack_ptr;
|
||
}
|
||
|
||
// Allocate space for a new Java object. FIXME: this might be the
|
||
// wrong interface; we might prefer to pass in the object type as
|
||
// well. It isn't important for this collector, but it might be for
|
||
// other collectors.
|
||
void *
|
||
_Jv_AllocObj (jsize size)
|
||
{
|
||
return GC_GENERIC_MALLOC (size, obj_kind_x);
|
||
}
|
||
|
||
// Allocate space for a new Java array. FIXME: again, this might be
|
||
// the wrong interface.
|
||
void *
|
||
_Jv_AllocArray (jsize size)
|
||
{
|
||
return GC_GENERIC_MALLOC (size, array_kind_x);
|
||
}
|
||
|
||
// Allocate some space that is known to be pointer-free.
|
||
void *
|
||
_Jv_AllocBytes (jsize size)
|
||
{
|
||
return GC_GENERIC_MALLOC (size, PTRFREE);
|
||
}
|
||
|
||
static void
|
||
call_finalizer (GC_PTR obj, GC_PTR client_data)
|
||
{
|
||
_Jv_FinalizerFunc *fn = (_Jv_FinalizerFunc *) client_data;
|
||
jobject jobj = (jobject) obj;
|
||
|
||
(*fn) (jobj);
|
||
}
|
||
|
||
void
|
||
_Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *meth)
|
||
{
|
||
GC_REGISTER_FINALIZER_NO_ORDER (object, call_finalizer, meth,
|
||
NULL, NULL);
|
||
}
|
||
|
||
void
|
||
_Jv_RunFinalizers (void)
|
||
{
|
||
GC_invoke_finalizers ();
|
||
}
|
||
|
||
void
|
||
_Jv_RunAllFinalizers (void)
|
||
{
|
||
GC_finalize_all ();
|
||
}
|
||
|
||
void
|
||
_Jv_RunGC (void)
|
||
{
|
||
GC_gcollect ();
|
||
}
|
||
|
||
long
|
||
_Jv_GCTotalMemory (void)
|
||
{
|
||
return GC_get_heap_size ();
|
||
}
|
||
|
||
/* Sum size of each hblk. */
|
||
static void
|
||
sum_blocks (struct hblk *h, word arg)
|
||
{
|
||
long *sump = (long *) arg;
|
||
/* This evil computation is from boehm-gc/checksums.c. */
|
||
hdr *hhdr = HDR (h);
|
||
int bytes = WORDS_TO_BYTES (hhdr->hb_sz);
|
||
bytes += HDR_BYTES + HBLKSIZE - 1;
|
||
bytes &= ~ (HBLKSIZE - 1);
|
||
*sump += bytes;
|
||
}
|
||
|
||
/* This turns out to be expensive to implement. For now, we don't
|
||
care. We could make it less expensive, perhaps, but that would
|
||
require some changes to the collector. */
|
||
long
|
||
_Jv_GCFreeMemory (void)
|
||
{
|
||
long sum = 0;
|
||
GC_apply_to_all_blocks (sum_blocks, &sum);
|
||
return sum;
|
||
}
|
||
|
||
void
|
||
_Jv_InitGC (void)
|
||
{
|
||
int proc;
|
||
DCL_LOCK_STATE;
|
||
|
||
DISABLE_SIGNALS ();
|
||
LOCK ();
|
||
|
||
if (initialized)
|
||
{
|
||
UNLOCK ();
|
||
ENABLE_SIGNALS ();
|
||
return;
|
||
}
|
||
initialized = 1;
|
||
|
||
// Set up state for marking and allocation of Java objects.
|
||
obj_free_list = (ptr_t *) GC_generic_malloc_inner ((MAXOBJSZ + 1)
|
||
* sizeof (ptr_t),
|
||
PTRFREE);
|
||
memset (obj_free_list, 0, (MAXOBJSZ + 1) * sizeof (ptr_t));
|
||
|
||
proc = GC_n_mark_procs++;
|
||
GC_mark_procs[proc] = (mark_proc) _Jv_MarkObj;
|
||
|
||
obj_kind_x = GC_n_kinds++;
|
||
GC_obj_kinds[obj_kind_x].ok_freelist = obj_free_list;
|
||
GC_obj_kinds[obj_kind_x].ok_reclaim_list = 0;
|
||
GC_obj_kinds[obj_kind_x].ok_descriptor = MAKE_PROC (proc, 0);
|
||
GC_obj_kinds[obj_kind_x].ok_relocate_descr = FALSE;
|
||
GC_obj_kinds[obj_kind_x].ok_init = TRUE;
|
||
|
||
// Set up state for marking and allocation of arrays of Java
|
||
// objects.
|
||
array_free_list = (ptr_t *) GC_generic_malloc_inner ((MAXOBJSZ + 1)
|
||
* sizeof (ptr_t),
|
||
PTRFREE);
|
||
memset (array_free_list, 0, (MAXOBJSZ + 1) * sizeof (ptr_t));
|
||
|
||
proc = GC_n_mark_procs++;
|
||
GC_mark_procs[proc] = (mark_proc) _Jv_MarkArray;
|
||
|
||
array_kind_x = GC_n_kinds++;
|
||
GC_obj_kinds[array_kind_x].ok_freelist = array_free_list;
|
||
GC_obj_kinds[array_kind_x].ok_reclaim_list = 0;
|
||
GC_obj_kinds[array_kind_x].ok_descriptor = MAKE_PROC (proc, 0);
|
||
GC_obj_kinds[array_kind_x].ok_relocate_descr = FALSE;
|
||
GC_obj_kinds[array_kind_x].ok_init = TRUE;
|
||
|
||
UNLOCK ();
|
||
ENABLE_SIGNALS ();
|
||
}
|