692 lines
19 KiB
C++
692 lines
19 KiB
C++
// boehm.cc - interface between libjava and Boehm GC.
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/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
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Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <stdio.h>
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#include <limits.h>
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#include <jvm.h>
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#include <gcj/cni.h>
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#include <java/lang/Class.h>
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#include <java/lang/reflect/Modifier.h>
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#include <java-interp.h>
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// More nastiness: the GC wants to define TRUE and FALSE. We don't
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// need the Java definitions (themselves a hack), so we undefine them.
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#undef TRUE
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#undef FALSE
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// We include two autoconf headers. Avoid multiple definition warnings.
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#undef PACKAGE_NAME
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#undef PACKAGE_STRING
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#undef PACKAGE_TARNAME
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#undef PACKAGE_VERSION
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#ifdef HAVE_DLFCN_H
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#undef _GNU_SOURCE
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#endif
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extern "C"
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{
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#include <gc_config.h>
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// Set GC_DEBUG before including gc.h!
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#ifdef LIBGCJ_GC_DEBUG
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# define GC_DEBUG
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#endif
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#include <gc_mark.h>
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#include <gc_gcj.h>
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#include <javaxfc.h> // GC_finalize_all declaration.
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#ifdef THREAD_LOCAL_ALLOC
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# define GC_REDIRECT_TO_LOCAL
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# include <gc_local_alloc.h>
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#endif
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// From boehm's misc.c
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void GC_enable();
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void GC_disable();
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};
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#define MAYBE_MARK(Obj, Top, Limit, Source) \
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Top=GC_MARK_AND_PUSH((GC_PTR) Obj, Top, Limit, (GC_PTR *) Source)
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// `kind' index used when allocating Java arrays.
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static int array_kind_x;
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// Freelist used for Java arrays.
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static void **array_free_list;
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static int _Jv_GC_has_static_roots (const char *filename, void *, size_t);
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// This is called by the GC during the mark phase. It marks a Java
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// object. We use `void *' arguments and return, and not what the
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// Boehm GC wants, to avoid pollution in our headers.
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void *
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_Jv_MarkObj (void *addr, void *msp, void *msl, void *env)
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{
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struct GC_ms_entry *mark_stack_ptr = (struct GC_ms_entry *)msp;
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struct GC_ms_entry *mark_stack_limit = (struct GC_ms_entry *)msl;
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if (env == (void *)1) /* Object allocated with debug allocator. */
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addr = (GC_PTR)GC_USR_PTR_FROM_BASE(addr);
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jobject obj = (jobject) addr;
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_Jv_VTable *dt = *(_Jv_VTable **) addr;
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// The object might not yet have its vtable set, or it might
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// really be an object on the freelist. In either case, the vtable slot
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// will either be 0, or it will point to a cleared object.
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// This assumes Java objects have size at least 3 words,
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// including the header. But this should remain true, since this
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// should only be used with debugging allocation or with large objects.
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if (__builtin_expect (! dt || !(dt -> get_finalizer()), false))
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return mark_stack_ptr;
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jclass klass = dt->clas;
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GC_PTR p;
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p = (GC_PTR) dt;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, obj);
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# ifndef JV_HASH_SYNCHRONIZATION
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// Every object has a sync_info pointer.
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p = (GC_PTR) obj->sync_info;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, obj);
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# endif
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if (__builtin_expect (klass == &java::lang::Class::class$, false))
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{
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// Currently we allocate some of the memory referenced from class objects
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// as pointerfree memory, and then mark it more intelligently here.
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// We ensure that the ClassClass mark descriptor forces invocation of
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// this procedure.
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// Correctness of this is subtle, but it looks OK to me for now. For the incremental
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// collector, we need to make sure that the class object is written whenever
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// any of the subobjects are altered and may need rescanning. This may be tricky
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// during construction, and this may not be the right way to do this with
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// incremental collection.
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// If we overflow the mark stack, we will rescan the class object, so we should
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// be OK. The same applies if we redo the mark phase because win32 unmapped part
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// of our root set. - HB
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jclass c = (jclass) addr;
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p = (GC_PTR) c->name;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->superclass;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->constants.tags;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->constants.data;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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// If the class is an array, then the methods field holds a
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// pointer to the element class. If the class is primitive,
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// then the methods field holds a pointer to the array class.
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p = (GC_PTR) c->methods;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->fields;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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// The vtable might be allocated even for compiled code.
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p = (GC_PTR) c->vtable;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->interfaces;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->loader;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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// The dispatch tables can be allocated at runtime.
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p = (GC_PTR) c->ancestors;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->idt;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->arrayclass;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->protectionDomain;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->hack_signers;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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p = (GC_PTR) c->aux_info;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, c);
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}
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else
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{
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// NOTE: each class only holds information about the class
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// itself. So we must do the marking for the entire inheritance
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// tree in order to mark all fields. FIXME: what about
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// interfaces? We skip Object here, because Object only has a
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// sync_info, and we handled that earlier.
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// Note: occasionally `klass' can be null. For instance, this
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// can happen if a GC occurs between the point where an object
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// is allocated and where the vtbl slot is set.
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while (klass && klass != &java::lang::Object::class$)
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{
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jfieldID field = JvGetFirstInstanceField (klass);
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jint max = JvNumInstanceFields (klass);
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for (int i = 0; i < max; ++i)
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{
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if (JvFieldIsRef (field))
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{
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jobject val = JvGetObjectField (obj, field);
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p = (GC_PTR) val;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, obj);
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}
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field = field->getNextField ();
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}
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klass = klass->getSuperclass();
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}
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}
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return mark_stack_ptr;
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}
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// This is called by the GC during the mark phase. It marks a Java
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// array (of objects). We use `void *' arguments and return, and not
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// what the Boehm GC wants, to avoid pollution in our headers.
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void *
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_Jv_MarkArray (void *addr, void *msp, void *msl, void *env)
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{
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struct GC_ms_entry *mark_stack_ptr = (struct GC_ms_entry *)msp;
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struct GC_ms_entry *mark_stack_limit = (struct GC_ms_entry *)msl;
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if (env == (void *)1) /* Object allocated with debug allocator. */
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addr = (void *)GC_USR_PTR_FROM_BASE(addr);
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jobjectArray array = (jobjectArray) addr;
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_Jv_VTable *dt = *(_Jv_VTable **) addr;
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// Assumes size >= 3 words. That's currently true since arrays have
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// a vtable, sync pointer, and size. If the sync pointer goes away,
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// we may need to round up the size.
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if (__builtin_expect (! dt || !(dt -> get_finalizer()), false))
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return mark_stack_ptr;
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GC_PTR p;
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p = (GC_PTR) dt;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, array);
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# ifndef JV_HASH_SYNCHRONIZATION
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// Every object has a sync_info pointer.
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p = (GC_PTR) array->sync_info;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, array);
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# endif
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for (int i = 0; i < JvGetArrayLength (array); ++i)
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{
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jobject obj = elements (array)[i];
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p = (GC_PTR) obj;
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MAYBE_MARK (p, mark_stack_ptr, mark_stack_limit, array);
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}
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return mark_stack_ptr;
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}
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// Generate a GC marking descriptor for a class.
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//
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// We assume that the gcj mark proc has index 0. This is a dubious assumption,
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// since another one could be registered first. But the compiler also
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// knows this, so in that case everything else will break, too.
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#define GCJ_DEFAULT_DESCR GC_MAKE_PROC(GC_GCJ_RESERVED_MARK_PROC_INDEX,0)
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void *
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_Jv_BuildGCDescr(jclass self)
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{
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jlong desc = 0;
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jint bits_per_word = CHAR_BIT * sizeof (void *);
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// Note: for now we only consider a bitmap mark descriptor. We
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// could also handle the case where the first N fields of a type are
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// references. However, this is not very likely to be used by many
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// classes, and it is easier to compute things this way.
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// The vtable pointer.
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desc |= 1ULL << (bits_per_word - 1);
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#ifndef JV_HASH_SYNCHRONIZATION
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// The sync_info field.
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desc |= 1ULL << (bits_per_word - 2);
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#endif
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for (jclass klass = self; klass != NULL; klass = klass->getSuperclass())
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{
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jfieldID field = JvGetFirstInstanceField(klass);
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int count = JvNumInstanceFields(klass);
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for (int i = 0; i < count; ++i)
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{
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if (field->isRef())
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{
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unsigned int off = field->getOffset();
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// If we run into a weird situation, we bail.
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if (off % sizeof (void *) != 0)
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return (void *) (GCJ_DEFAULT_DESCR);
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off /= sizeof (void *);
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// If we find a field outside the range of our bitmap,
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// fall back to procedure marker. The bottom 2 bits are
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// reserved.
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if (off >= (unsigned) bits_per_word - 2)
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return (void *) (GCJ_DEFAULT_DESCR);
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desc |= 1ULL << (bits_per_word - off - 1);
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}
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field = field->getNextField();
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}
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}
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// For bitmap mark type, bottom bits are 01.
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desc |= 1;
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// Bogus warning avoidance (on many platforms).
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return (void *) (unsigned long) desc;
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}
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// Allocate some space that is known to be pointer-free.
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void *
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_Jv_AllocBytes (jsize size)
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{
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void *r = GC_MALLOC_ATOMIC (size);
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// We have to explicitly zero memory here, as the GC doesn't
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// guarantee that PTRFREE allocations are zeroed. Note that we
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// don't have to do this for other allocation types because we set
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// the `ok_init' flag in the type descriptor.
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memset (r, 0, size);
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return r;
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}
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#ifdef LIBGCJ_GC_DEBUG
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void *
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_Jv_AllocObj (jsize size, jclass klass)
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{
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return GC_GCJ_MALLOC (size, klass->vtable);
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}
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void *
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_Jv_AllocPtrFreeObj (jsize size, jclass klass)
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{
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#ifdef JV_HASH_SYNCHRONIZATION
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void * obj = GC_MALLOC_ATOMIC(size);
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*((_Jv_VTable **) obj) = klass->vtable;
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#else
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void * obj = GC_GCJ_MALLOC(size, klass->vtable);
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#endif
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return obj;
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}
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#endif /* LIBGCJ_GC_DEBUG */
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// In the non-debug case, the above two functions are defined
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// as inline functions in boehm-gc.h. In the debug case we
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// really want to take advantage of the definitions in gc_gcj.h.
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// Allocate space for a new Java array.
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// Used only for arrays of objects.
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void *
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_Jv_AllocArray (jsize size, jclass klass)
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{
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void *obj;
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#ifdef LIBGCJ_GC_DEBUG
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// There isn't much to lose by scanning this conservatively.
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// If we didn't, the mark proc would have to understand that
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// it needed to skip the header.
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obj = GC_MALLOC(size);
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#else
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const jsize min_heap_addr = 16*1024;
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// A heuristic. If size is less than this value, the size
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// stored in the array can't possibly be misinterpreted as
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// a pointer. Thus we lose nothing by scanning the object
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// completely conservatively, since no misidentification can
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// take place.
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if (size < min_heap_addr)
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obj = GC_MALLOC(size);
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else
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obj = GC_generic_malloc (size, array_kind_x);
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#endif
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*((_Jv_VTable **) obj) = klass->vtable;
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return obj;
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}
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/* Allocate space for a new non-Java object, which does not have the usual
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Java object header but may contain pointers to other GC'ed objects. */
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void *
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_Jv_AllocRawObj (jsize size)
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{
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return (void *) GC_MALLOC (size ? size : 1);
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}
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static void
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call_finalizer (GC_PTR obj, GC_PTR client_data)
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{
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_Jv_FinalizerFunc *fn = (_Jv_FinalizerFunc *) client_data;
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jobject jobj = (jobject) obj;
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(*fn) (jobj);
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}
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void
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_Jv_RegisterFinalizer (void *object, _Jv_FinalizerFunc *meth)
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{
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GC_REGISTER_FINALIZER_NO_ORDER (object, call_finalizer, (GC_PTR) meth,
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NULL, NULL);
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}
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void
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_Jv_RunFinalizers (void)
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{
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GC_invoke_finalizers ();
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}
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void
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_Jv_RunAllFinalizers (void)
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{
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GC_finalize_all ();
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}
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void
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_Jv_RunGC (void)
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{
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GC_gcollect ();
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}
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long
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_Jv_GCTotalMemory (void)
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{
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return GC_get_heap_size ();
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}
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long
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_Jv_GCFreeMemory (void)
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{
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return GC_get_free_bytes ();
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}
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void
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_Jv_GCSetInitialHeapSize (size_t size)
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{
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size_t current = GC_get_heap_size ();
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if (size > current)
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GC_expand_hp (size - current);
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}
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void
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_Jv_GCSetMaximumHeapSize (size_t size)
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{
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GC_set_max_heap_size ((GC_word) size);
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}
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void
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_Jv_DisableGC (void)
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{
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GC_disable();
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}
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void
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_Jv_EnableGC (void)
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{
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GC_enable();
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}
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static void * handle_out_of_memory(size_t)
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{
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_Jv_ThrowNoMemory();
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}
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static void
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gcj_describe_type_fn(void *obj, char *out_buf)
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{
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_Jv_VTable *dt = *(_Jv_VTable **) obj;
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if (! dt /* Shouldn't happen */)
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{
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strcpy(out_buf, "GCJ (bad)");
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return;
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}
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jclass klass = dt->clas;
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if (!klass /* shouldn't happen */)
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{
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strcpy(out_buf, "GCJ (bad)");
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return;
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}
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jstring name = klass -> getName();
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size_t len = name -> length();
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if (len >= GC_TYPE_DESCR_LEN) len = GC_TYPE_DESCR_LEN - 1;
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JvGetStringUTFRegion (name, 0, len, out_buf);
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out_buf[len] = '\0';
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}
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void
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_Jv_InitGC (void)
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{
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int proc;
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static bool gc_initialized;
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if (gc_initialized)
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return;
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gc_initialized = 1;
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// Ignore pointers that do not point to the start of an object.
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GC_all_interior_pointers = 0;
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#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
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// Tell the collector to ask us before scanning DSOs.
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GC_register_has_static_roots_callback (_Jv_GC_has_static_roots);
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#endif
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// Configure the collector to use the bitmap marking descriptors that we
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// stash in the class vtable.
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// We always use mark proc descriptor 0, since the compiler knows
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// about it.
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GC_init_gcj_malloc (0, (void *) _Jv_MarkObj);
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// Cause an out of memory error to be thrown from the allocators,
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// instead of returning 0. This is cheaper than checking on allocation.
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GC_oom_fn = handle_out_of_memory;
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GC_java_finalization = 1;
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// We use a different mark procedure for object arrays. This code
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// configures a different object `kind' for object array allocation and
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||
// marking.
|
||
array_free_list = GC_new_free_list();
|
||
proc = GC_new_proc((GC_mark_proc)_Jv_MarkArray);
|
||
array_kind_x = GC_new_kind(array_free_list, GC_MAKE_PROC (proc, 0), 0, 1);
|
||
|
||
// Arrange to have the GC print Java class names in backtraces, etc.
|
||
GC_register_describe_type_fn(GC_gcj_kind, gcj_describe_type_fn);
|
||
GC_register_describe_type_fn(GC_gcj_debug_kind, gcj_describe_type_fn);
|
||
}
|
||
|
||
#ifdef JV_HASH_SYNCHRONIZATION
|
||
// Allocate an object with a fake vtable pointer, which causes only
|
||
// the first field (beyond the fake vtable pointer) to be traced.
|
||
// Eventually this should probably be generalized.
|
||
|
||
static _Jv_VTable trace_one_vtable = {
|
||
0, // class pointer
|
||
(void *)(2 * sizeof(void *)),
|
||
// descriptor; scan 2 words incl. vtable ptr.
|
||
// Least significant bits must be zero to
|
||
// identify this as a length descriptor
|
||
{0} // First method
|
||
};
|
||
|
||
void *
|
||
_Jv_AllocTraceOne (jsize size /* includes vtable slot */)
|
||
{
|
||
return GC_GCJ_MALLOC (size, &trace_one_vtable);
|
||
}
|
||
|
||
// Ditto for two words.
|
||
// the first field (beyond the fake vtable pointer) to be traced.
|
||
// Eventually this should probably be generalized.
|
||
|
||
static _Jv_VTable trace_two_vtable =
|
||
{
|
||
0, // class pointer
|
||
(void *)(3 * sizeof(void *)),
|
||
// descriptor; scan 3 words incl. vtable ptr.
|
||
{0} // First method
|
||
};
|
||
|
||
void *
|
||
_Jv_AllocTraceTwo (jsize size /* includes vtable slot */)
|
||
{
|
||
return GC_GCJ_MALLOC (size, &trace_two_vtable);
|
||
}
|
||
|
||
#endif /* JV_HASH_SYNCHRONIZATION */
|
||
|
||
void
|
||
_Jv_GCInitializeFinalizers (void (*notifier) (void))
|
||
{
|
||
GC_finalize_on_demand = 1;
|
||
GC_finalizer_notifier = notifier;
|
||
}
|
||
|
||
void
|
||
_Jv_GCRegisterDisappearingLink (jobject *objp)
|
||
{
|
||
// This test helps to ensure that we meet a precondition of
|
||
// GC_general_register_disappearing_link, viz. "Obj must be a
|
||
// pointer to the first word of an object we allocated."
|
||
if (GC_base(*objp))
|
||
GC_general_register_disappearing_link ((GC_PTR *) objp, (GC_PTR) *objp);
|
||
}
|
||
|
||
jboolean
|
||
_Jv_GCCanReclaimSoftReference (jobject)
|
||
{
|
||
// For now, always reclaim soft references. FIXME.
|
||
return true;
|
||
}
|
||
|
||
|
||
|
||
#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
|
||
|
||
// We keep a store of the filenames of DSOs that need to be
|
||
// conservatively scanned by the garbage collector. During collection
|
||
// the gc calls _Jv_GC_has_static_roots() to see if the data segment
|
||
// of a DSO should be scanned.
|
||
typedef struct filename_node
|
||
{
|
||
char *name;
|
||
struct filename_node *link;
|
||
} filename_node;
|
||
|
||
#define FILENAME_STORE_SIZE 17
|
||
static filename_node *filename_store[FILENAME_STORE_SIZE];
|
||
|
||
// Find a filename in filename_store.
|
||
static filename_node **
|
||
find_file (const char *filename)
|
||
{
|
||
int index = strlen (filename) % FILENAME_STORE_SIZE;
|
||
filename_node **node = &filename_store[index];
|
||
|
||
while (*node)
|
||
{
|
||
if (strcmp ((*node)->name, filename) == 0)
|
||
return node;
|
||
node = &(*node)->link;
|
||
}
|
||
|
||
return node;
|
||
}
|
||
|
||
// Print the store of filenames of DSOs that need collection.
|
||
void
|
||
_Jv_print_gc_store (void)
|
||
{
|
||
for (int i = 0; i < FILENAME_STORE_SIZE; i++)
|
||
{
|
||
filename_node *node = filename_store[i];
|
||
while (node)
|
||
{
|
||
fprintf (stderr, "%s\n", node->name);
|
||
node = node->link;
|
||
}
|
||
}
|
||
}
|
||
|
||
// Create a new node in the store of libraries to collect.
|
||
static filename_node *
|
||
new_node (const char *filename)
|
||
{
|
||
filename_node *node = (filename_node*)_Jv_Malloc (sizeof (filename_node));
|
||
node->name = (char *)_Jv_Malloc (strlen (filename) + 1);
|
||
node->link = NULL;
|
||
strcpy (node->name, filename);
|
||
|
||
return node;
|
||
}
|
||
|
||
// Nonzero if the gc should scan this lib.
|
||
static int
|
||
_Jv_GC_has_static_roots (const char *filename, void *, size_t)
|
||
{
|
||
if (filename == NULL || strlen (filename) == 0)
|
||
// No filename; better safe than sorry.
|
||
return 1;
|
||
|
||
filename_node **node = find_file (filename);
|
||
if (*node)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
#endif
|
||
|
||
// Register the DSO that contains p for collection.
|
||
void
|
||
_Jv_RegisterLibForGc (const void *p __attribute__ ((__unused__)))
|
||
{
|
||
#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
|
||
Dl_info info;
|
||
|
||
if (dladdr (const_cast<void *>(p), &info) != 0)
|
||
{
|
||
filename_node **node = find_file (info.dli_fname);
|
||
if (! *node)
|
||
*node = new_node (info.dli_fname);
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
|
||
&& !defined(GC_WIN32_THREADS) && !defined(GC_DARWIN_THREADS)
|
||
|
||
void
|
||
_Jv_SuspendThread (_Jv_Thread_t *thread)
|
||
{
|
||
GC_suspend_thread (_Jv_GetPlatformThreadID (thread));
|
||
}
|
||
|
||
void
|
||
_Jv_ResumeThread (_Jv_Thread_t *thread)
|
||
{
|
||
GC_resume_thread (_Jv_GetPlatformThreadID (thread));
|
||
}
|
||
|
||
#endif
|