/**
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* \file
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* Simple generational GC.
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*
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* Copyright 2001-2003 Ximian, Inc
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* Copyright 2003-2010 Novell, Inc.
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* Copyright 2011 Xamarin Inc (http://www.xamarin.com)
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* Copyright (C) 2012 Xamarin Inc
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*
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* Licensed under the MIT license. See LICENSE file in the project root for full license information.
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*/
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#ifndef __MONO_SGENGC_H__
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#define __MONO_SGENGC_H__
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/* pthread impl */
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#include "config.h"
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#ifdef HAVE_SGEN_GC
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typedef struct _SgenThreadInfo SgenThreadInfo;
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#undef THREAD_INFO_TYPE
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#define THREAD_INFO_TYPE SgenThreadInfo
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#include <glib.h>
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#include <stdio.h>
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#ifdef HAVE_PTHREAD_H
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#include <pthread.h>
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#endif
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#include <stdint.h>
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#include "mono/utils/mono-compiler.h"
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#include "mono/utils/atomic.h"
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#include "mono/utils/mono-os-mutex.h"
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#include "mono/utils/mono-coop-mutex.h"
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#include "mono/utils/ward.h"
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#include "mono/sgen/sgen-conf.h"
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#include "mono/sgen/sgen-hash-table.h"
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#include "mono/sgen/sgen-protocol.h"
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#include "mono/sgen/gc-internal-agnostic.h"
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#include "mono/sgen/sgen-thread-pool.h"
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/* The method used to clear the nursery */
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/* Clearing at nursery collections is the safest, but has bad interactions with caches.
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* Clearing at TLAB creation is much faster, but more complex and it might expose hard
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* to find bugs.
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*/
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typedef enum {
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CLEAR_AT_GC,
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CLEAR_AT_TLAB_CREATION,
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CLEAR_AT_TLAB_CREATION_DEBUG
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} NurseryClearPolicy;
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NurseryClearPolicy sgen_get_nursery_clear_policy (void);
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#if !defined(__MACH__) && !MONO_MACH_ARCH_SUPPORTED && defined(HAVE_PTHREAD_KILL)
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#define SGEN_POSIX_STW 1
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#endif
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/*
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* The nursery section uses this struct.
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*/
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typedef struct _GCMemSection GCMemSection;
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struct _GCMemSection {
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char *data;
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char *end_data;
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/*
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* scan starts is an array of pointers to objects equally spaced in the allocation area
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* They let use quickly find pinned objects from pinning pointers.
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*/
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char **scan_starts;
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/* in major collections indexes in the pin_queue for objects that pin this section */
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size_t pin_queue_first_entry;
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size_t pin_queue_last_entry;
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size_t num_scan_start;
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};
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/*
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* Recursion is not allowed for the thread lock.
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*/
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#define LOCK_DECLARE(name) mono_mutex_t name
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/* if changing LOCK_INIT to something that isn't idempotent, look at
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its use in mono_gc_base_init in sgen-gc.c */
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#define LOCK_INIT(name) mono_os_mutex_init (&(name))
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#define LOCK_GC do { sgen_gc_lock (); } while (0)
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#define UNLOCK_GC do { sgen_gc_unlock (); } while (0)
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extern MonoCoopMutex sgen_interruption_mutex;
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#define LOCK_INTERRUPTION mono_coop_mutex_lock (&sgen_interruption_mutex)
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#define UNLOCK_INTERRUPTION mono_coop_mutex_unlock (&sgen_interruption_mutex)
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/* FIXME: Use mono_atomic_add_i32 & mono_atomic_add_i64 to reduce the CAS cost. */
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#define SGEN_CAS mono_atomic_cas_i32
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#define SGEN_CAS_PTR mono_atomic_cas_ptr
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#define SGEN_ATOMIC_ADD(x,i) do { \
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int __old_x; \
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do { \
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__old_x = (x); \
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} while (mono_atomic_cas_i32 (&(x), __old_x + (i), __old_x) != __old_x); \
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} while (0)
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#define SGEN_ATOMIC_ADD_P(x,i) do { \
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size_t __old_x; \
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do { \
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__old_x = (x); \
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} while (mono_atomic_cas_ptr ((void**)&(x), (void*)(__old_x + (i)), (void*)__old_x) != (void*)__old_x); \
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} while (0)
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#ifdef HEAVY_STATISTICS
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extern guint64 stat_objects_alloced_degraded;
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extern guint64 stat_bytes_alloced_degraded;
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extern guint64 stat_copy_object_called_major;
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extern guint64 stat_objects_copied_major;
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#endif
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#define SGEN_ASSERT(level, a, ...) do { \
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if (G_UNLIKELY ((level) <= SGEN_MAX_ASSERT_LEVEL && !(a))) { \
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g_error (__VA_ARGS__); \
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} } while (0)
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#ifdef HAVE_LOCALTIME_R
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# define LOG_TIMESTAMP \
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do { \
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time_t t; \
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struct tm tod; \
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time(&t); \
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localtime_r(&t, &tod); \
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strftime(logTime, sizeof(logTime), "%Y-%m-%d %H:%M:%S", &tod); \
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} while (0)
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#else
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# define LOG_TIMESTAMP \
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do { \
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time_t t; \
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struct tm *tod; \
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time(&t); \
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tod = localtime(&t); \
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strftime(logTime, sizeof(logTime), "%F %T", tod); \
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} while (0)
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#endif
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#define SGEN_LOG(level, format, ...) do { \
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if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { \
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char logTime[80]; \
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LOG_TIMESTAMP; \
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mono_gc_printf (gc_debug_file, "%s " format "\n", logTime, ##__VA_ARGS__); \
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} } while (0)
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#define SGEN_COND_LOG(level, cond, format, ...) do { \
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if (G_UNLIKELY ((level) <= SGEN_MAX_DEBUG_LEVEL && (level) <= gc_debug_level)) { \
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if (cond) { \
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char logTime[80]; \
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LOG_TIMESTAMP; \
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mono_gc_printf (gc_debug_file, "%s " format "\n", logTime, ##__VA_ARGS__); \
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} \
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} } while (0)
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extern int gc_debug_level;
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extern FILE* gc_debug_file;
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extern int current_collection_generation;
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extern unsigned int sgen_global_stop_count;
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#define SGEN_ALIGN_UP_TO(val,align) (((val) + (align - 1)) & ~(align - 1))
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#define SGEN_ALIGN_DOWN_TO(val,align) ((val) & ~(align - 1))
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#define SGEN_ALLOC_ALIGN 8
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#define SGEN_ALLOC_ALIGN_BITS 3
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/* s must be non-negative */
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#define SGEN_CAN_ALIGN_UP(s) ((s) <= SIZE_MAX - (SGEN_ALLOC_ALIGN - 1))
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#define SGEN_ALIGN_UP(s) SGEN_ALIGN_UP_TO(s, SGEN_ALLOC_ALIGN)
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#define SGEN_ALIGN_DOWN(s) SGEN_ALIGN_DOWN_TO(s, SGEN_ALLOC_ALIGN)
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#if SIZEOF_VOID_P == 4
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#define ONE_P 1
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#else
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#define ONE_P 1ll
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#endif
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static inline guint
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sgen_aligned_addr_hash (gconstpointer ptr)
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{
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return GPOINTER_TO_UINT (ptr) >> 3;
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}
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#define SGEN_PTR_IN_NURSERY(p,bits,start,end) (((mword)(p) & ~(((mword)1 << (bits)) - 1)) == (mword)(start))
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extern size_t sgen_nursery_size;
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extern size_t sgen_nursery_max_size;
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extern int sgen_nursery_bits;
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extern char *sgen_nursery_start;
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extern char *sgen_nursery_end;
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static inline MONO_ALWAYS_INLINE gboolean
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sgen_ptr_in_nursery (void *p)
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{
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return SGEN_PTR_IN_NURSERY ((p), sgen_nursery_bits, sgen_nursery_start, sgen_nursery_end);
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}
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static inline MONO_ALWAYS_INLINE char*
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sgen_get_nursery_start (void)
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{
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return sgen_nursery_start;
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}
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static inline MONO_ALWAYS_INLINE char*
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sgen_get_nursery_end (void)
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{
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return sgen_nursery_end;
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}
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/*
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* We use the lowest three bits in the vtable pointer of objects to tag whether they're
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* forwarded, pinned, and/or cemented. These are the valid states:
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*
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* | State | bits |
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* |------------------+------+
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* | default | 000 |
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* | forwarded | 001 |
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* | pinned | 010 |
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* | pinned, cemented | 110 |
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*
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* We store them in the vtable slot because the bits are used in the sync block for other
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* purposes: if we merge them and alloc the sync blocks aligned to 8 bytes, we can change
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* this and use bit 3 in the syncblock (with the lower two bits both set for forwarded, that
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* would be an invalid combination for the monitor and hash code).
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*/
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#include "sgen-tagged-pointer.h"
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#define SGEN_VTABLE_BITS_MASK SGEN_TAGGED_POINTER_MASK
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#define SGEN_POINTER_IS_TAGGED_FORWARDED(p) SGEN_POINTER_IS_TAGGED_1((p))
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#define SGEN_POINTER_TAG_FORWARDED(p) SGEN_POINTER_TAG_1((p))
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#define SGEN_POINTER_IS_TAGGED_PINNED(p) SGEN_POINTER_IS_TAGGED_2((p))
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#define SGEN_POINTER_TAG_PINNED(p) SGEN_POINTER_TAG_2((p))
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#define SGEN_POINTER_IS_TAGGED_CEMENTED(p) SGEN_POINTER_IS_TAGGED_4((p))
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#define SGEN_POINTER_TAG_CEMENTED(p) SGEN_POINTER_TAG_4((p))
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#define SGEN_POINTER_UNTAG_VTABLE(p) SGEN_POINTER_UNTAG_ALL((p))
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/* returns NULL if not forwarded, or the forwarded address */
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#define SGEN_VTABLE_IS_FORWARDED(vtable) ((GCObject *)(SGEN_POINTER_IS_TAGGED_FORWARDED ((vtable)) ? SGEN_POINTER_UNTAG_VTABLE ((vtable)) : NULL))
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#define SGEN_OBJECT_IS_FORWARDED(obj) ((GCObject *)SGEN_VTABLE_IS_FORWARDED (((mword*)(obj))[0]))
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#define SGEN_VTABLE_IS_PINNED(vtable) SGEN_POINTER_IS_TAGGED_PINNED ((vtable))
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#define SGEN_OBJECT_IS_PINNED(obj) (SGEN_VTABLE_IS_PINNED (((mword*)(obj))[0]))
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#define SGEN_OBJECT_IS_CEMENTED(obj) (SGEN_POINTER_IS_TAGGED_CEMENTED (((mword*)(obj))[0]))
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/* set the forwarded address fw_addr for object obj */
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#define SGEN_FORWARD_OBJECT(obj,fw_addr) do { \
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*(void**)(obj) = SGEN_POINTER_TAG_FORWARDED ((fw_addr)); \
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} while (0)
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#define SGEN_FORWARD_OBJECT_PAR(obj,fw_addr,final_fw_addr) do { \
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gpointer old_vtable_word = *(gpointer*)obj; \
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gpointer new_vtable_word; \
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final_fw_addr = SGEN_VTABLE_IS_FORWARDED (old_vtable_word); \
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if (final_fw_addr) \
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break; \
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new_vtable_word = SGEN_POINTER_TAG_FORWARDED ((fw_addr)); \
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old_vtable_word = mono_atomic_cas_ptr ((gpointer*)obj, new_vtable_word, old_vtable_word); \
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final_fw_addr = SGEN_VTABLE_IS_FORWARDED (old_vtable_word); \
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if (!final_fw_addr) \
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final_fw_addr = (fw_addr); \
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} while (0)
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#define SGEN_PIN_OBJECT(obj) do { \
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*(void**)(obj) = SGEN_POINTER_TAG_PINNED (*(void**)(obj)); \
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} while (0)
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#define SGEN_CEMENT_OBJECT(obj) do { \
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*(void**)(obj) = SGEN_POINTER_TAG_CEMENTED (*(void**)(obj)); \
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} while (0)
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/* Unpins and uncements */
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#define SGEN_UNPIN_OBJECT(obj) do { \
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*(void**)(obj) = SGEN_POINTER_UNTAG_VTABLE (*(void**)(obj)); \
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} while (0)
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/*
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* Since we set bits in the vtable, use the macro to load it from the pointer to
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* an object that is potentially pinned.
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*/
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#define SGEN_LOAD_VTABLE(obj) ((GCVTable)(SGEN_POINTER_UNTAG_ALL (SGEN_LOAD_VTABLE_UNCHECKED ((GCObject *)(obj)))))
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/*
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List of what each bit on of the vtable gc bits means.
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*/
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enum {
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// When the Java bridge has determined an object is "bridged", it uses these two bits to cache that information.
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SGEN_GC_BIT_BRIDGE_OBJECT = 1,
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SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT = 2,
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SGEN_GC_BIT_FINALIZER_AWARE = 4,
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};
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void sgen_gc_init (void)
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MONO_PERMIT (need (sgen_lock_gc));
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void sgen_os_init (void);
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void sgen_update_heap_boundaries (mword low, mword high);
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void sgen_check_section_scan_starts (GCMemSection *section);
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void sgen_conservatively_pin_objects_from (void **start, void **end, void *start_nursery, void *end_nursery, int pin_type);
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gboolean sgen_gc_initialized (void);
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/* Keep in sync with description_for_type() in sgen-internal.c! */
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enum {
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INTERNAL_MEM_PIN_QUEUE,
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INTERNAL_MEM_FRAGMENT,
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INTERNAL_MEM_SECTION,
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INTERNAL_MEM_SCAN_STARTS,
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INTERNAL_MEM_FIN_TABLE,
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INTERNAL_MEM_FINALIZE_ENTRY,
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INTERNAL_MEM_FINALIZE_READY,
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INTERNAL_MEM_DISLINK_TABLE,
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INTERNAL_MEM_DISLINK,
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INTERNAL_MEM_ROOTS_TABLE,
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INTERNAL_MEM_ROOT_RECORD,
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INTERNAL_MEM_STATISTICS,
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INTERNAL_MEM_STAT_PINNED_CLASS,
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INTERNAL_MEM_STAT_REMSET_CLASS,
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INTERNAL_MEM_GRAY_QUEUE,
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INTERNAL_MEM_MS_TABLES,
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INTERNAL_MEM_MS_BLOCK_INFO,
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INTERNAL_MEM_MS_BLOCK_INFO_SORT,
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INTERNAL_MEM_WORKER_DATA,
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INTERNAL_MEM_THREAD_POOL_JOB,
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INTERNAL_MEM_BRIDGE_DATA,
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INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE,
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INTERNAL_MEM_OLD_BRIDGE_HASH_TABLE_ENTRY,
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INTERNAL_MEM_BRIDGE_HASH_TABLE,
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INTERNAL_MEM_BRIDGE_HASH_TABLE_ENTRY,
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INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE,
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INTERNAL_MEM_BRIDGE_ALIVE_HASH_TABLE_ENTRY,
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INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE,
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INTERNAL_MEM_TARJAN_BRIDGE_HASH_TABLE_ENTRY,
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INTERNAL_MEM_TARJAN_OBJ_BUCKET,
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INTERNAL_MEM_BRIDGE_DEBUG,
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INTERNAL_MEM_TOGGLEREF_DATA,
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INTERNAL_MEM_CARDTABLE_MOD_UNION,
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INTERNAL_MEM_BINARY_PROTOCOL,
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INTERNAL_MEM_TEMPORARY,
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INTERNAL_MEM_LOG_ENTRY,
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INTERNAL_MEM_COMPLEX_DESCRIPTORS,
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INTERNAL_MEM_FIRST_CLIENT
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};
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enum {
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GENERATION_NURSERY,
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GENERATION_OLD,
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GENERATION_MAX
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};
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#ifdef SGEN_HEAVY_BINARY_PROTOCOL
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#define BINARY_PROTOCOL_ARG(x) ,x
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#else
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#define BINARY_PROTOCOL_ARG(x)
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#endif
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void sgen_init_internal_allocator (void);
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#define SGEN_DEFINE_OBJECT_VTABLE
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#ifdef SGEN_CLIENT_HEADER
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#include SGEN_CLIENT_HEADER
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#else
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#include "metadata/sgen-client-mono.h"
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#endif
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#undef SGEN_DEFINE_OBJECT_VTABLE
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#include "mono/sgen/sgen-descriptor.h"
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#include "mono/sgen/sgen-gray.h"
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/* the runtime can register areas of memory as roots: we keep two lists of roots,
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* a pinned root set for conservatively scanned roots and a normal one for
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* precisely scanned roots (currently implemented as a single list).
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*/
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typedef struct _RootRecord RootRecord;
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struct _RootRecord {
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char *end_root;
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SgenDescriptor root_desc;
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int source;
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const char *msg;
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};
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enum {
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ROOT_TYPE_NORMAL = 0, /* "normal" roots */
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ROOT_TYPE_PINNED = 1, /* roots without a GC descriptor */
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ROOT_TYPE_WBARRIER = 2, /* roots with a write barrier */
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ROOT_TYPE_NUM
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};
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extern SgenHashTable roots_hash [ROOT_TYPE_NUM];
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int sgen_register_root (char *start, size_t size, SgenDescriptor descr, int root_type, int source, void *key, const char *msg)
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MONO_PERMIT (need (sgen_lock_gc));
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void sgen_deregister_root (char* addr)
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MONO_PERMIT (need (sgen_lock_gc));
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typedef void (*IterateObjectCallbackFunc) (GCObject*, size_t, void*);
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void sgen_scan_area_with_callback (char *start, char *end, IterateObjectCallbackFunc callback, void *data, gboolean allow_flags, gboolean fail_on_canaries);
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/* eventually share with MonoThread? */
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/*
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* This structure extends the MonoThreadInfo structure.
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*/
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struct _SgenThreadInfo {
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SgenClientThreadInfo client_info;
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char *tlab_start;
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char *tlab_next;
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char *tlab_temp_end;
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char *tlab_real_end;
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};
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gboolean sgen_is_worker_thread (MonoNativeThreadId thread);
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typedef void (*CopyOrMarkObjectFunc) (GCObject**, SgenGrayQueue*);
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typedef void (*ScanObjectFunc) (GCObject *obj, SgenDescriptor desc, SgenGrayQueue*);
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typedef void (*ScanVTypeFunc) (GCObject *full_object, char *start, SgenDescriptor desc, SgenGrayQueue* BINARY_PROTOCOL_ARG (size_t size));
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typedef void (*ScanPtrFieldFunc) (GCObject *obj, GCObject **ptr, SgenGrayQueue* queue);
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typedef gboolean (*DrainGrayStackFunc) (SgenGrayQueue *queue);
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typedef struct {
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CopyOrMarkObjectFunc copy_or_mark_object;
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ScanObjectFunc scan_object;
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ScanVTypeFunc scan_vtype;
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ScanPtrFieldFunc scan_ptr_field;
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/* Drain stack optimized for the above functions */
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DrainGrayStackFunc drain_gray_stack;
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/*FIXME add allocation function? */
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} SgenObjectOperations;
|
|
typedef struct
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{
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SgenObjectOperations *ops;
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SgenGrayQueue *queue;
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} ScanCopyContext;
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|
#define CONTEXT_FROM_OBJECT_OPERATIONS(ops, queue) ((ScanCopyContext) { (ops), (queue) })
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|
void sgen_report_internal_mem_usage (void);
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void sgen_dump_internal_mem_usage (FILE *heap_dump_file);
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void sgen_dump_section (GCMemSection *section, const char *type);
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void sgen_dump_occupied (char *start, char *end, char *section_start);
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void sgen_register_fixed_internal_mem_type (int type, size_t size);
|
|
void* sgen_alloc_internal (int type);
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void sgen_free_internal (void *addr, int type);
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|
void* sgen_alloc_internal_dynamic (size_t size, int type, gboolean assert_on_failure);
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void sgen_free_internal_dynamic (void *addr, size_t size, int type);
|
|
void sgen_pin_stats_enable (void);
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void sgen_pin_stats_register_object (GCObject *obj, int generation);
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void sgen_pin_stats_register_global_remset (GCObject *obj);
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void sgen_pin_stats_report (void);
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|
void sgen_sort_addresses (void **array, size_t size);
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void sgen_add_to_global_remset (gpointer ptr, GCObject *obj);
|
|
int sgen_get_current_collection_generation (void);
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gboolean sgen_collection_is_concurrent (void);
|
gboolean sgen_concurrent_collection_in_progress (void);
|
|
typedef struct _SgenFragment SgenFragment;
|
|
struct _SgenFragment {
|
SgenFragment *next;
|
char *fragment_start;
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char *fragment_next; /* the current soft limit for allocation */
|
char *fragment_end;
|
SgenFragment *next_in_order; /* We use a different entry for all active fragments so we can avoid SMR. */
|
};
|
|
typedef struct {
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SgenFragment *alloc_head; /* List head to be used when allocating memory. Walk with fragment_next. */
|
SgenFragment *region_head; /* List head of the region used by this allocator. Walk with next_in_order. */
|
} SgenFragmentAllocator;
|
|
void sgen_fragment_allocator_add (SgenFragmentAllocator *allocator, char *start, char *end);
|
void sgen_fragment_allocator_release (SgenFragmentAllocator *allocator);
|
void* sgen_fragment_allocator_par_alloc (SgenFragmentAllocator *allocator, size_t size);
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void* sgen_fragment_allocator_serial_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size);
|
void* sgen_fragment_allocator_par_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size);
|
SgenFragment* sgen_fragment_allocator_alloc (void);
|
void sgen_clear_allocator_fragments (SgenFragmentAllocator *allocator);
|
void sgen_clear_range (char *start, char *end);
|
|
|
/*
|
This is a space/speed compromise as we need to make sure the from/to space check is both O(1)
|
and only hit cache hot memory. On a 4Mb nursery it requires 1024 bytes, or 3% of your average
|
L1 cache. On small configs with a 512kb nursery, this goes to 0.4%.
|
|
Experimental results on how much space we waste with a 4Mb nursery:
|
|
Note that the wastage applies to the half nursery, or 2Mb:
|
|
Test 1 (compiling corlib):
|
9: avg: 3.1k
|
8: avg: 1.6k
|
|
*/
|
#define SGEN_TO_SPACE_GRANULE_BITS 9
|
#define SGEN_TO_SPACE_GRANULE_IN_BYTES (1 << SGEN_TO_SPACE_GRANULE_BITS)
|
|
extern char *sgen_space_bitmap;
|
extern size_t sgen_space_bitmap_size;
|
|
static inline gboolean
|
sgen_nursery_is_to_space (void *object)
|
{
|
size_t idx = ((char*)object - sgen_nursery_start) >> SGEN_TO_SPACE_GRANULE_BITS;
|
size_t byte = idx >> 3;
|
size_t bit = idx & 0x7;
|
|
SGEN_ASSERT (4, sgen_ptr_in_nursery (object), "object %p is not in nursery [%p - %p]", object, sgen_get_nursery_start (), sgen_get_nursery_end ());
|
SGEN_ASSERT (4, byte < sgen_space_bitmap_size, "byte index %zd out of range (%zd)", byte, sgen_space_bitmap_size);
|
|
return (sgen_space_bitmap [byte] & (1 << bit)) != 0;
|
}
|
|
static inline gboolean
|
sgen_nursery_is_from_space (void *object)
|
{
|
return !sgen_nursery_is_to_space (object);
|
}
|
|
static inline gboolean
|
sgen_nursery_is_object_alive (GCObject *obj)
|
{
|
/* FIXME put this asserts under a non default level */
|
g_assert (sgen_ptr_in_nursery (obj));
|
|
if (sgen_nursery_is_to_space (obj))
|
return TRUE;
|
|
if (SGEN_OBJECT_IS_PINNED (obj) || SGEN_OBJECT_IS_FORWARDED (obj))
|
return TRUE;
|
|
return FALSE;
|
}
|
|
typedef struct {
|
gboolean is_split;
|
gboolean is_parallel;
|
|
GCObject* (*alloc_for_promotion) (GCVTable vtable, GCObject *obj, size_t objsize, gboolean has_references);
|
GCObject* (*alloc_for_promotion_par) (GCVTable vtable, GCObject *obj, size_t objsize, gboolean has_references);
|
|
SgenObjectOperations serial_ops;
|
SgenObjectOperations serial_ops_with_concurrent_major;
|
SgenObjectOperations parallel_ops;
|
SgenObjectOperations parallel_ops_with_concurrent_major;
|
|
void (*prepare_to_space) (char *to_space_bitmap, size_t space_bitmap_size);
|
void (*clear_fragments) (void);
|
SgenFragment* (*build_fragments_get_exclude_head) (void);
|
void (*build_fragments_release_exclude_head) (void);
|
void (*build_fragments_finish) (SgenFragmentAllocator *allocator);
|
void (*init_nursery) (SgenFragmentAllocator *allocator, char *start, char *end);
|
|
gboolean (*handle_gc_param) (const char *opt); /* Optional */
|
void (*print_gc_param_usage) (void); /* Optional */
|
} SgenMinorCollector;
|
|
extern SgenMinorCollector sgen_minor_collector;
|
|
void sgen_simple_nursery_init (SgenMinorCollector *collector, gboolean parallel);
|
void sgen_split_nursery_init (SgenMinorCollector *collector);
|
|
/* Updating references */
|
|
#ifdef SGEN_CHECK_UPDATE_REFERENCE
|
gboolean sgen_thread_pool_is_thread_pool_thread (MonoNativeThreadId some_thread);
|
|
static inline void
|
sgen_update_reference (GCObject **p, GCObject *o, gboolean allow_null)
|
{
|
if (!allow_null)
|
SGEN_ASSERT (0, o, "Cannot update a reference with a NULL pointer");
|
SGEN_ASSERT (0, !sgen_workers_is_worker_thread (mono_native_thread_id_get ()), "Can't update a reference in the worker thread");
|
*p = o;
|
}
|
|
#define SGEN_UPDATE_REFERENCE_ALLOW_NULL(p,o) sgen_update_reference ((GCObject**)(p), (GCObject*)(o), TRUE)
|
#define SGEN_UPDATE_REFERENCE(p,o) sgen_update_reference ((GCObject**)(p), (GCObject*)(o), FALSE)
|
#else
|
#define SGEN_UPDATE_REFERENCE_ALLOW_NULL(p,o) (*(GCObject**)(p) = (GCObject*)(o))
|
#define SGEN_UPDATE_REFERENCE(p,o) SGEN_UPDATE_REFERENCE_ALLOW_NULL ((p), (o))
|
#endif
|
|
/* Major collector */
|
|
typedef void (*sgen_cardtable_block_callback) (mword start, mword size);
|
void sgen_major_collector_iterate_live_block_ranges (sgen_cardtable_block_callback callback);
|
void sgen_major_collector_iterate_block_ranges (sgen_cardtable_block_callback callback);
|
|
typedef enum {
|
ITERATE_OBJECTS_SWEEP = 1,
|
ITERATE_OBJECTS_NON_PINNED = 2,
|
ITERATE_OBJECTS_PINNED = 4,
|
ITERATE_OBJECTS_SWEEP_NON_PINNED = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_NON_PINNED,
|
ITERATE_OBJECTS_SWEEP_PINNED = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_PINNED,
|
ITERATE_OBJECTS_SWEEP_ALL = ITERATE_OBJECTS_SWEEP | ITERATE_OBJECTS_NON_PINNED | ITERATE_OBJECTS_PINNED
|
} IterateObjectsFlags;
|
|
typedef struct
|
{
|
size_t num_scanned_objects;
|
size_t num_unique_scanned_objects;
|
} ScannedObjectCounts;
|
|
typedef enum {
|
CARDTABLE_SCAN_GLOBAL = 0,
|
CARDTABLE_SCAN_MOD_UNION = 1,
|
CARDTABLE_SCAN_MOD_UNION_PRECLEAN = CARDTABLE_SCAN_MOD_UNION | 2,
|
} CardTableScanType;
|
|
typedef struct _SgenMajorCollector SgenMajorCollector;
|
struct _SgenMajorCollector {
|
size_t section_size;
|
gboolean is_concurrent;
|
gboolean is_parallel;
|
gboolean supports_cardtable;
|
gboolean sweeps_lazily;
|
|
void* (*alloc_heap) (mword nursery_size, mword nursery_align);
|
gboolean (*is_object_live) (GCObject *obj);
|
GCObject* (*alloc_small_pinned_obj) (GCVTable vtable, size_t size, gboolean has_references);
|
GCObject* (*alloc_degraded) (GCVTable vtable, size_t size);
|
|
SgenObjectOperations major_ops_serial;
|
SgenObjectOperations major_ops_concurrent_start;
|
SgenObjectOperations major_ops_concurrent_finish;
|
SgenObjectOperations major_ops_conc_par_start;
|
SgenObjectOperations major_ops_conc_par_finish;
|
|
GCObject* (*alloc_object) (GCVTable vtable, size_t size, gboolean has_references);
|
GCObject* (*alloc_object_par) (GCVTable vtable, size_t size, gboolean has_references);
|
void (*free_pinned_object) (GCObject *obj, size_t size);
|
|
/*
|
* This is used for domain unloading, heap walking from the logging profiler, and
|
* debugging. Can assume the world is stopped.
|
*/
|
void (*iterate_objects) (IterateObjectsFlags flags, IterateObjectCallbackFunc callback, void *data);
|
|
void (*free_non_pinned_object) (GCObject *obj, size_t size);
|
void (*pin_objects) (SgenGrayQueue *queue);
|
void (*pin_major_object) (GCObject *obj, SgenGrayQueue *queue);
|
void (*scan_card_table) (CardTableScanType scan_type, ScanCopyContext ctx, int job_index, int job_split_count, int block_count);
|
void (*iterate_live_block_ranges) (sgen_cardtable_block_callback callback);
|
void (*iterate_block_ranges) (sgen_cardtable_block_callback callback);
|
void (*update_cardtable_mod_union) (void);
|
void (*init_to_space) (void);
|
void (*sweep) (void);
|
gboolean (*have_swept) (void);
|
void (*finish_sweeping) (void);
|
void (*free_swept_blocks) (size_t section_reserve);
|
void (*check_scan_starts) (void);
|
void (*dump_heap) (FILE *heap_dump_file);
|
gint64 (*get_used_size) (void);
|
void (*start_nursery_collection) (void);
|
void (*finish_nursery_collection) (void);
|
void (*start_major_collection) (void);
|
void (*finish_major_collection) (ScannedObjectCounts *counts);
|
gboolean (*ptr_is_in_non_pinned_space) (char *ptr, char **start);
|
gboolean (*ptr_is_from_pinned_alloc) (char *ptr);
|
void (*report_pinned_memory_usage) (void);
|
size_t (*get_num_major_sections) (void);
|
size_t (*get_bytes_survived_last_sweep) (void);
|
gboolean (*handle_gc_param) (const char *opt);
|
void (*print_gc_param_usage) (void);
|
void (*post_param_init) (SgenMajorCollector *collector);
|
gboolean (*is_valid_object) (char *ptr);
|
GCVTable (*describe_pointer) (char *pointer);
|
guint8* (*get_cardtable_mod_union_for_reference) (char *object);
|
long long (*get_and_reset_num_major_objects_marked) (void);
|
void (*count_cards) (long long *num_total_cards, long long *num_marked_cards);
|
void (*init_block_free_lists) (gpointer *list_p);
|
};
|
|
extern SgenMajorCollector major_collector;
|
|
void sgen_marksweep_init (SgenMajorCollector *collector);
|
void sgen_marksweep_conc_init (SgenMajorCollector *collector);
|
void sgen_marksweep_conc_par_init (SgenMajorCollector *collector);
|
SgenMajorCollector* sgen_get_major_collector (void);
|
SgenMinorCollector* sgen_get_minor_collector (void);
|
|
|
typedef struct _SgenRememberedSet {
|
void (*wbarrier_set_field) (GCObject *obj, gpointer field_ptr, GCObject* value);
|
void (*wbarrier_arrayref_copy) (gpointer dest_ptr, gpointer src_ptr, int count);
|
void (*wbarrier_value_copy) (gpointer dest, gpointer src, int count, size_t element_size);
|
void (*wbarrier_object_copy) (GCObject* obj, GCObject *src);
|
void (*wbarrier_generic_nostore) (gpointer ptr);
|
void (*record_pointer) (gpointer ptr);
|
void (*wbarrier_range_copy) (gpointer dest, gpointer src, int count);
|
|
void (*start_scan_remsets) (void);
|
|
void (*clear_cards) (void);
|
|
gboolean (*find_address) (char *addr);
|
gboolean (*find_address_with_cards) (char *cards_start, guint8 *cards, char *addr);
|
} SgenRememberedSet;
|
|
SgenRememberedSet *sgen_get_remset (void);
|
|
/*
|
* These must be kept in sync with object.h. They're here for using SGen independently of
|
* Mono.
|
*/
|
void mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count);
|
void mono_gc_wbarrier_generic_nostore (gpointer ptr);
|
void mono_gc_wbarrier_generic_store (gpointer ptr, GCObject* value);
|
void mono_gc_wbarrier_generic_store_atomic (gpointer ptr, GCObject *value);
|
|
void sgen_wbarrier_range_copy (gpointer _dest, gpointer _src, int size);
|
|
static inline SgenDescriptor
|
sgen_obj_get_descriptor (GCObject *obj)
|
{
|
GCVTable vtable = SGEN_LOAD_VTABLE_UNCHECKED (obj);
|
SGEN_ASSERT (9, !SGEN_POINTER_IS_TAGGED_ANY (vtable), "Object can't be tagged");
|
return sgen_vtable_get_descriptor (vtable);
|
}
|
|
static inline SgenDescriptor
|
sgen_obj_get_descriptor_safe (GCObject *obj)
|
{
|
GCVTable vtable = SGEN_LOAD_VTABLE (obj);
|
return sgen_vtable_get_descriptor (vtable);
|
}
|
|
static mword sgen_client_par_object_get_size (GCVTable vtable, GCObject* o);
|
static mword sgen_client_slow_object_get_size (GCVTable vtable, GCObject* o);
|
|
static inline mword
|
sgen_safe_object_get_size (GCObject *obj)
|
{
|
GCObject *forwarded;
|
GCVTable vtable = SGEN_LOAD_VTABLE_UNCHECKED (obj);
|
|
/*
|
* Once we load the vtable, we must always use it, in case we are in parallel case.
|
* Otherwise the object might get forwarded in the meantime and we would read an
|
* invalid vtable. An object cannot be forwarded for a second time during same GC.
|
*/
|
if ((forwarded = SGEN_VTABLE_IS_FORWARDED (vtable)))
|
return sgen_client_par_object_get_size (SGEN_LOAD_VTABLE (forwarded), obj);
|
else
|
return sgen_client_par_object_get_size ((GCVTable)SGEN_POINTER_UNTAG_ALL (vtable), obj);
|
}
|
|
static inline gboolean
|
sgen_safe_object_is_small (GCObject *obj, int type)
|
{
|
if (type <= DESC_TYPE_MAX_SMALL_OBJ)
|
return TRUE;
|
return SGEN_ALIGN_UP (sgen_safe_object_get_size ((GCObject*)obj)) <= SGEN_MAX_SMALL_OBJ_SIZE;
|
}
|
|
/*
|
* This variant guarantees to return the exact size of the object
|
* before alignment. Needed for canary support.
|
*/
|
static inline guint
|
sgen_safe_object_get_size_unaligned (GCObject *obj)
|
{
|
GCObject *forwarded;
|
|
if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
|
obj = (GCObject*)forwarded;
|
}
|
|
return sgen_client_slow_object_get_size (SGEN_LOAD_VTABLE (obj), obj);
|
}
|
|
#ifdef SGEN_CLIENT_HEADER
|
#include SGEN_CLIENT_HEADER
|
#else
|
#include "metadata/sgen-client-mono.h"
|
#endif
|
|
gboolean sgen_object_is_live (GCObject *obj);
|
|
void sgen_init_fin_weak_hash (void);
|
|
void sgen_register_obj_with_weak_fields (GCObject *obj);
|
|
/* FIXME: move the toggleref stuff out of here */
|
void sgen_mark_togglerefs (char *start, char *end, ScanCopyContext ctx);
|
void sgen_clear_togglerefs (char *start, char *end, ScanCopyContext ctx);
|
|
void sgen_process_togglerefs (void);
|
void sgen_register_test_toggleref_callback (void);
|
|
void sgen_mark_bridge_object (GCObject *obj)
|
MONO_PERMIT (need (sgen_gc_locked));
|
void sgen_collect_bridge_objects (int generation, ScanCopyContext ctx)
|
MONO_PERMIT (need (sgen_gc_locked));
|
|
typedef gboolean (*SgenObjectPredicateFunc) (GCObject *obj, void *user_data);
|
|
void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_world_stopped));
|
|
gboolean sgen_gc_is_object_ready_for_finalization (GCObject *object);
|
void sgen_gc_lock (void) MONO_PERMIT (use (sgen_lock_gc), grant (sgen_gc_locked), revoke (sgen_lock_gc));
|
void sgen_gc_unlock (void) MONO_PERMIT (use (sgen_gc_locked), revoke (sgen_gc_locked), grant (sgen_lock_gc));
|
|
void sgen_queue_finalization_entry (GCObject *obj);
|
const char* sgen_generation_name (int generation);
|
|
void sgen_finalize_in_range (int generation, ScanCopyContext ctx)
|
MONO_PERMIT (need (sgen_gc_locked));
|
void sgen_null_link_in_range (int generation, ScanCopyContext ctx, gboolean track)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_world_stopped));
|
void sgen_process_fin_stage_entries (void)
|
MONO_PERMIT (need (sgen_gc_locked));
|
gboolean sgen_have_pending_finalizers (void);
|
void sgen_object_register_for_finalization (GCObject *obj, void *user_data)
|
MONO_PERMIT (need (sgen_lock_gc));
|
|
void sgen_finalize_if (SgenObjectPredicateFunc predicate, void *user_data)
|
MONO_PERMIT (need (sgen_lock_gc));
|
void sgen_remove_finalizers_if (SgenObjectPredicateFunc predicate, void *user_data, int generation);
|
void sgen_set_suspend_finalizers (void);
|
|
void sgen_wbroots_iterate_live_block_ranges (sgen_cardtable_block_callback cb);
|
void sgen_wbroots_scan_card_table (ScanCopyContext ctx);
|
|
void sgen_register_disappearing_link (GCObject *obj, void **link, gboolean track, gboolean in_gc);
|
|
GCObject* sgen_weak_link_get (void **link_addr);
|
|
gboolean sgen_drain_gray_stack (ScanCopyContext ctx);
|
|
enum {
|
SPACE_NURSERY,
|
SPACE_MAJOR,
|
SPACE_LOS
|
};
|
|
void sgen_pin_object (GCObject *object, SgenGrayQueue *queue);
|
void sgen_set_pinned_from_failed_allocation (mword objsize);
|
|
void sgen_ensure_free_space (size_t size, int generation)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
|
void sgen_gc_collect (int generation)
|
MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
|
void sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
|
|
int sgen_gc_collection_count (int generation);
|
/* FIXME: what exactly does this return? */
|
size_t sgen_gc_get_used_size (void)
|
MONO_PERMIT (need (sgen_lock_gc));
|
size_t sgen_gc_get_total_heap_allocation (void);
|
|
/* STW */
|
|
void sgen_stop_world (int generation)
|
MONO_PERMIT (need (sgen_gc_locked), use (sgen_stop_world), grant (sgen_world_stopped), revoke (sgen_stop_world));
|
void sgen_restart_world (int generation)
|
MONO_PERMIT (need (sgen_gc_locked), use (sgen_world_stopped), revoke (sgen_world_stopped), grant (sgen_stop_world));
|
gboolean sgen_is_world_stopped (void);
|
|
gboolean sgen_set_allow_synchronous_major (gboolean flag);
|
|
/* LOS */
|
|
typedef struct _LOSObject LOSObject;
|
struct _LOSObject {
|
LOSObject *next;
|
mword size; /* this is the object size, lowest bit used for pin/mark */
|
guint8 * volatile cardtable_mod_union; /* only used by the concurrent collector */
|
#if SIZEOF_VOID_P < 8
|
mword dummy; /* to align object to sizeof (double) */
|
#endif
|
GCObject data [MONO_ZERO_LEN_ARRAY];
|
};
|
|
extern LOSObject *los_object_list;
|
extern mword los_memory_usage;
|
extern mword los_memory_usage_total;
|
|
void sgen_los_free_object (LOSObject *obj);
|
void* sgen_los_alloc_large_inner (GCVTable vtable, size_t size)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
|
void sgen_los_sweep (void);
|
gboolean sgen_ptr_is_in_los (char *ptr, char **start);
|
void sgen_los_iterate_objects (IterateObjectCallbackFunc cb, void *user_data);
|
void sgen_los_iterate_live_block_ranges (sgen_cardtable_block_callback callback);
|
void sgen_los_scan_card_table (CardTableScanType scan_type, ScanCopyContext ctx, int job_index, int job_split_count);
|
void sgen_los_update_cardtable_mod_union (void);
|
void sgen_los_count_cards (long long *num_total_cards, long long *num_marked_cards);
|
gboolean sgen_los_is_valid_object (char *object);
|
gboolean mono_sgen_los_describe_pointer (char *ptr);
|
LOSObject* sgen_los_header_for_object (GCObject *data);
|
mword sgen_los_object_size (LOSObject *obj);
|
void sgen_los_pin_object (GCObject *obj);
|
gboolean sgen_los_pin_object_par (GCObject *obj);
|
gboolean sgen_los_object_is_pinned (GCObject *obj);
|
void sgen_los_mark_mod_union_card (GCObject *mono_obj, void **ptr);
|
|
|
/* nursery allocator */
|
|
void sgen_clear_nursery_fragments (void);
|
void sgen_nursery_allocator_prepare_for_pinning (void);
|
void sgen_nursery_allocator_set_nursery_bounds (char *nursery_start, size_t min_size, size_t max_size);
|
void sgen_resize_nursery (gboolean need_shrink);
|
mword sgen_build_nursery_fragments (GCMemSection *nursery_section, SgenGrayQueue *unpin_queue);
|
void sgen_init_nursery_allocator (void);
|
void sgen_nursery_allocator_init_heavy_stats (void);
|
void sgen_init_allocator (void);
|
void* sgen_nursery_alloc (size_t size);
|
void* sgen_nursery_alloc_range (size_t size, size_t min_size, size_t *out_alloc_size);
|
gboolean sgen_can_alloc_size (size_t size);
|
void sgen_nursery_retire_region (void *address, ptrdiff_t size);
|
|
void sgen_nursery_alloc_prepare_for_minor (void);
|
void sgen_nursery_alloc_prepare_for_major (void);
|
|
GCObject* sgen_alloc_for_promotion (GCObject *obj, size_t objsize, gboolean has_references);
|
|
GCObject* sgen_alloc_obj_nolock (GCVTable vtable, size_t size)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
|
GCObject* sgen_try_alloc_obj_nolock (GCVTable vtable, size_t size);
|
|
/* Threads */
|
|
void* sgen_thread_attach (SgenThreadInfo* info);
|
void sgen_thread_detach_with_lock (SgenThreadInfo *p);
|
|
/* Finalization/ephemeron support */
|
|
static inline gboolean
|
sgen_major_is_object_alive (GCObject *object)
|
{
|
mword objsize;
|
|
/* Oldgen objects can be pinned and forwarded too */
|
if (SGEN_OBJECT_IS_PINNED (object) || SGEN_OBJECT_IS_FORWARDED (object))
|
return TRUE;
|
|
/*
|
* FIXME: major_collector.is_object_live() also calculates the
|
* size. Avoid the double calculation.
|
*/
|
objsize = SGEN_ALIGN_UP (sgen_safe_object_get_size (object));
|
if (objsize > SGEN_MAX_SMALL_OBJ_SIZE)
|
return sgen_los_object_is_pinned (object);
|
|
return major_collector.is_object_live (object);
|
}
|
|
|
/*
|
* If the object has been forwarded it means it's still referenced from a root.
|
* If it is pinned it's still alive as well.
|
* A LOS object is only alive if we have pinned it.
|
* Return TRUE if @obj is ready to be finalized.
|
*/
|
static inline gboolean
|
sgen_is_object_alive (GCObject *object)
|
{
|
if (sgen_ptr_in_nursery (object))
|
return sgen_nursery_is_object_alive (object);
|
|
return sgen_major_is_object_alive (object);
|
}
|
|
|
/*
|
* This function returns true if @object is either alive or it belongs to the old gen
|
* and we're currently doing a minor collection.
|
*/
|
static inline int
|
sgen_is_object_alive_for_current_gen (GCObject *object)
|
{
|
if (sgen_ptr_in_nursery (object))
|
return sgen_nursery_is_object_alive (object);
|
|
if (current_collection_generation == GENERATION_NURSERY)
|
return TRUE;
|
|
return sgen_major_is_object_alive (object);
|
}
|
|
int sgen_gc_invoke_finalizers (void)
|
MONO_PERMIT (need (sgen_lock_gc));
|
|
/* GC handles */
|
|
void sgen_init_gchandles (void);
|
|
void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track)
|
MONO_PERMIT (need (sgen_gc_locked));
|
|
typedef gpointer (*SgenGCHandleIterateCallback) (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user);
|
|
guint32 sgen_gchandle_new (GCObject *obj, gboolean pinned);
|
guint32 sgen_gchandle_new_weakref (GCObject *obj, gboolean track_resurrection);
|
void sgen_gchandle_iterate (GCHandleType handle_type, int max_generation, SgenGCHandleIterateCallback callback, gpointer user)
|
MONO_PERMIT (need (sgen_world_stopped));
|
void sgen_gchandle_set_target (guint32 gchandle, GCObject *obj);
|
void sgen_mark_normal_gc_handles (void *addr, SgenUserMarkFunc mark_func, void *gc_data)
|
MONO_PERMIT (need (sgen_world_stopped));
|
void sgen_gc_handles_report_roots (SgenUserReportRootFunc mark_func, void *gc_data)
|
MONO_PERMIT (need (sgen_world_stopped));
|
gpointer sgen_gchandle_get_metadata (guint32 gchandle);
|
GCObject *sgen_gchandle_get_target (guint32 gchandle);
|
void sgen_gchandle_free (guint32 gchandle);
|
|
/* Other globals */
|
|
extern GCMemSection *nursery_section;
|
extern guint32 collect_before_allocs;
|
extern guint32 verify_before_allocs;
|
extern gboolean has_per_allocation_action;
|
extern size_t degraded_mode;
|
extern int default_nursery_size;
|
extern guint32 tlab_size;
|
extern NurseryClearPolicy nursery_clear_policy;
|
extern gboolean sgen_try_free_some_memory;
|
extern mword total_promoted_size;
|
extern mword total_allocated_major;
|
extern volatile gboolean sgen_suspend_finalizers;
|
extern MonoCoopMutex gc_mutex;
|
extern volatile gboolean concurrent_collection_in_progress;
|
|
/* Nursery helpers. */
|
|
static inline void
|
sgen_set_nursery_scan_start (char *p)
|
{
|
size_t idx = (p - (char*)nursery_section->data) / SGEN_SCAN_START_SIZE;
|
char *old = nursery_section->scan_starts [idx];
|
if (!old || old > p)
|
nursery_section->scan_starts [idx] = p;
|
}
|
|
|
/* Object Allocation */
|
|
typedef enum {
|
ATYPE_NORMAL,
|
ATYPE_VECTOR,
|
ATYPE_SMALL,
|
ATYPE_STRING,
|
ATYPE_NUM
|
} SgenAllocatorType;
|
|
void sgen_clear_tlabs (void);
|
|
GCObject* sgen_alloc_obj (GCVTable vtable, size_t size)
|
MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
|
GCObject* sgen_alloc_obj_pinned (GCVTable vtable, size_t size)
|
MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
|
GCObject* sgen_alloc_obj_mature (GCVTable vtable, size_t size)
|
MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
|
|
/* Debug support */
|
|
void sgen_check_remset_consistency (void);
|
void sgen_check_mod_union_consistency (void);
|
void sgen_check_major_refs (void);
|
void sgen_check_whole_heap (gboolean allow_missing_pinning);
|
void sgen_check_whole_heap_stw (void)
|
MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
|
void sgen_check_objref (char *obj);
|
void sgen_check_heap_marked (gboolean nursery_must_be_pinned);
|
void sgen_check_nursery_objects_pinned (gboolean pinned);
|
void sgen_check_for_xdomain_refs (void);
|
GCObject* sgen_find_object_for_ptr (char *ptr);
|
|
void mono_gc_scan_for_specific_ref (GCObject *key, gboolean precise);
|
|
void sgen_debug_enable_heap_dump (const char *filename);
|
void sgen_debug_dump_heap (const char *type, int num, const char *reason);
|
|
void sgen_debug_verify_nursery (gboolean do_dump_nursery_content);
|
void sgen_debug_check_nursery_is_clean (void);
|
|
/* Environment variable parsing */
|
|
#define MONO_GC_PARAMS_NAME "MONO_GC_PARAMS"
|
#define MONO_GC_DEBUG_NAME "MONO_GC_DEBUG"
|
|
void sgen_env_var_error (const char *env_var, const char *fallback, const char *description_format, ...);
|
|
/* Utilities */
|
|
void sgen_qsort (void *array, size_t count, size_t element_size, int (*compare) (const void*, const void*));
|
gint64 sgen_timestamp (void);
|
|
/*
|
* Canary (guard word) support
|
* Notes:
|
* - CANARY_SIZE must be multiple of word size in bytes
|
* - Canary space is not included on checks against SGEN_MAX_SMALL_OBJ_SIZE
|
*/
|
|
gboolean nursery_canaries_enabled (void);
|
|
#define CANARY_SIZE 8
|
#define CANARY_STRING "koupepia"
|
|
#define CANARIFY_SIZE(size) if (nursery_canaries_enabled ()) { \
|
size = size + CANARY_SIZE; \
|
}
|
|
#define CANARIFY_ALLOC(addr,size) if (nursery_canaries_enabled ()) { \
|
memcpy ((char*) (addr) + (size), CANARY_STRING, CANARY_SIZE); \
|
}
|
|
#define CANARY_VALID(addr) (strncmp ((char*) (addr), CANARY_STRING, CANARY_SIZE) == 0)
|
|
#define CHECK_CANARY_FOR_OBJECT(addr,fail) if (nursery_canaries_enabled ()) { \
|
guint size = sgen_safe_object_get_size_unaligned ((GCObject *) (addr)); \
|
char* canary_ptr = (char*) (addr) + size; \
|
if (!CANARY_VALID(canary_ptr)) { \
|
char *window_start, *window_end; \
|
window_start = (char*)(addr) - 128; \
|
if (!sgen_ptr_in_nursery (window_start)) \
|
window_start = sgen_get_nursery_start (); \
|
window_end = (char*)(addr) + 128; \
|
if (!sgen_ptr_in_nursery (window_end)) \
|
window_end = sgen_get_nursery_end (); \
|
fprintf (stderr, "\nCANARY ERROR - Type:%s Size:%d Address:%p Data:\n", sgen_client_vtable_get_name (SGEN_LOAD_VTABLE ((addr))), size, (char*) addr); \
|
fwrite (addr, sizeof (char), size, stderr); \
|
fprintf (stderr, "\nCanary zone (next 12 chars):\n"); \
|
fwrite (canary_ptr, sizeof (char), 12, stderr); \
|
fprintf (stderr, "\nOriginal canary string:\n"); \
|
fwrite (CANARY_STRING, sizeof (char), 8, stderr); \
|
for (int x = -8; x <= 8; x++) { \
|
if (canary_ptr + x < (char*) addr); \
|
continue; \
|
if (CANARY_VALID(canary_ptr +x)) \
|
fprintf (stderr, "\nCANARY ERROR - canary found at offset %d\n", x); \
|
} \
|
fprintf (stderr, "\nSurrounding nursery (%p - %p):\n", window_start, window_end); \
|
fwrite (window_start, sizeof (char), window_end - window_start, stderr); \
|
} }
|
|
/*
|
* This causes the compile to extend the liveness of 'v' till the call to dummy_use
|
*/
|
static inline void
|
sgen_dummy_use (gpointer v)
|
{
|
#if defined(_MSC_VER) || defined(HOST_WASM)
|
static volatile gpointer ptr;
|
ptr = v;
|
#elif defined(__GNUC__)
|
__asm__ volatile ("" : "=r"(v) : "r"(v));
|
#else
|
#error "Implement sgen_dummy_use for your compiler"
|
#endif
|
}
|
|
#endif /* HAVE_SGEN_GC */
|
|
#endif /* __MONO_SGENGC_H__ */
|
