/usr/include/gc/gc_mark.h is in libgc-dev 1:7.4.2-8ubuntu1.
This file is owned by root:root, with mode 0o644.
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 2001 by Hewlett-Packard Company. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
/*
* This contains interfaces to the GC marker that are likely to be useful to
* clients that provide detailed heap layout information to the collector.
* This interface should not be used by normal C or C++ clients.
* It will be useful to runtimes for other languages.
*
* This is an experts-only interface! There are many ways to break the
* collector in subtle ways by using this functionality.
*/
#ifndef GC_MARK_H
#define GC_MARK_H
#ifndef GC_H
# include "gc.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* A client supplied mark procedure. Returns new mark stack pointer. */
/* Primary effect should be to push new entries on the mark stack. */
/* Mark stack pointer values are passed and returned explicitly. */
/* Global variables describing mark stack are not necessarily valid. */
/* (This usually saves a few cycles by keeping things in registers.) */
/* Assumed to scan about GC_PROC_BYTES on average. If it needs to do */
/* much more work than that, it should do it in smaller pieces by */
/* pushing itself back on the mark stack. */
/* Note that it should always do some work (defined as marking some */
/* objects) before pushing more than one entry on the mark stack. */
/* This is required to ensure termination in the event of mark stack */
/* overflows. */
/* This procedure is always called with at least one empty entry on the */
/* mark stack. */
/* Currently we require that mark procedures look for pointers in a */
/* subset of the places the conservative marker would. It must be safe */
/* to invoke the normal mark procedure instead. */
/* WARNING: Such a mark procedure may be invoked on an unused object */
/* residing on a free list. Such objects are cleared, except for a */
/* free list link field in the first word. Thus mark procedures may */
/* not count on the presence of a type descriptor, and must handle this */
/* case correctly somehow. */
#define GC_PROC_BYTES 100
#ifdef GC_BUILD
struct GC_ms_entry;
#else
struct GC_ms_entry { void *opaque; };
#endif
typedef struct GC_ms_entry * (*GC_mark_proc)(GC_word * /* addr */,
struct GC_ms_entry * /* mark_stack_ptr */,
struct GC_ms_entry * /* mark_stack_limit */,
GC_word /* env */);
#define GC_LOG_MAX_MARK_PROCS 6
#define GC_MAX_MARK_PROCS (1 << GC_LOG_MAX_MARK_PROCS)
/* In a few cases it's necessary to assign statically known indices to */
/* certain mark procs. Thus we reserve a few for well known clients. */
/* (This is necessary if mark descriptors are compiler generated.) */
#define GC_RESERVED_MARK_PROCS 8
#define GC_GCJ_RESERVED_MARK_PROC_INDEX 0
/* Object descriptors on mark stack or in objects. Low order two */
/* bits are tags distinguishing among the following 4 possibilities */
/* for the high order 30 bits. */
#define GC_DS_TAG_BITS 2
#define GC_DS_TAGS ((1 << GC_DS_TAG_BITS) - 1)
#define GC_DS_LENGTH 0 /* The entire word is a length in bytes that */
/* must be a multiple of 4. */
#define GC_DS_BITMAP 1 /* 30 (62) bits are a bitmap describing pointer */
/* fields. The msb is 1 if the first word */
/* is a pointer. */
/* (This unconventional ordering sometimes */
/* makes the marker slightly faster.) */
/* Zeroes indicate definite nonpointers. Ones */
/* indicate possible pointers. */
/* Only usable if pointers are word aligned. */
#define GC_DS_PROC 2
/* The objects referenced by this object can be */
/* pushed on the mark stack by invoking */
/* PROC(descr). ENV(descr) is passed as the */
/* last argument. */
#define GC_MAKE_PROC(proc_index, env) \
(((((env) << GC_LOG_MAX_MARK_PROCS) \
| (proc_index)) << GC_DS_TAG_BITS) | GC_DS_PROC)
#define GC_DS_PER_OBJECT 3 /* The real descriptor is at the */
/* byte displacement from the beginning of the */
/* object given by descr & ~DS_TAGS */
/* If the descriptor is negative, the real */
/* descriptor is at (*<object_start>) - */
/* (descr & ~DS_TAGS) - GC_INDIR_PER_OBJ_BIAS */
/* The latter alternative can be used if each */
/* object contains a type descriptor in the */
/* first word. */
/* Note that in the multi-threaded environments */
/* per-object descriptors must be located in */
/* either the first two or last two words of */
/* the object, since only those are guaranteed */
/* to be cleared while the allocation lock is */
/* held. */
#define GC_INDIR_PER_OBJ_BIAS 0x10
GC_API void * GC_least_plausible_heap_addr;
GC_API void * GC_greatest_plausible_heap_addr;
/* Bounds on the heap. Guaranteed valid */
/* Likely to include future heap expansion. */
/* Hence usually includes not-yet-mapped */
/* memory. */
/* Handle nested references in a custom mark procedure. */
/* Check if obj is a valid object. If so, ensure that it is marked. */
/* If it was not previously marked, push its contents onto the mark */
/* stack for future scanning. The object will then be scanned using */
/* its mark descriptor. */
/* Returns the new mark stack pointer. */
/* Handles mark stack overflows correctly. */
/* Since this marks first, it makes progress even if there are mark */
/* stack overflows. */
/* Src is the address of the pointer to obj, which is used only */
/* for back pointer-based heap debugging. */
/* It is strongly recommended that most objects be handled without mark */
/* procedures, e.g. with bitmap descriptors, and that mark procedures */
/* be reserved for exceptional cases. That will ensure that */
/* performance of this call is not extremely performance critical. */
/* (Otherwise we would need to inline GC_mark_and_push completely, */
/* which would tie the client code to a fixed collector version.) */
/* Note that mark procedures should explicitly call FIXUP_POINTER() */
/* if required. */
GC_API struct GC_ms_entry * GC_CALL GC_mark_and_push(void * /* obj */,
struct GC_ms_entry * /* mark_stack_ptr */,
struct GC_ms_entry * /* mark_stack_limit */,
void ** /* src */);
#define GC_MARK_AND_PUSH(obj, msp, lim, src) \
((GC_word)(obj) >= (GC_word)GC_least_plausible_heap_addr && \
(GC_word)(obj) <= (GC_word)GC_greatest_plausible_heap_addr ? \
GC_mark_and_push(obj, msp, lim, src) : (msp))
GC_API size_t GC_debug_header_size;
/* The size of the header added to objects allocated through */
/* the GC_debug routines. */
/* Defined as a variable so that client mark procedures don't */
/* need to be recompiled for collector version changes. */
#define GC_USR_PTR_FROM_BASE(p) ((void *)((char *)(p) + GC_debug_header_size))
/* And some routines to support creation of new "kinds", e.g. with */
/* custom mark procedures, by language runtimes. */
/* The _inner versions assume the caller holds the allocation lock. */
/* Return a new free list array. */
GC_API void ** GC_CALL GC_new_free_list(void);
GC_API void ** GC_CALL GC_new_free_list_inner(void);
/* Return a new kind, as specified. */
GC_API unsigned GC_CALL GC_new_kind(void ** /* free_list */,
GC_word /* mark_descriptor_template */,
int /* add_size_to_descriptor */,
int /* clear_new_objects */) GC_ATTR_NONNULL(1);
/* The last two parameters must be zero or one. */
GC_API unsigned GC_CALL GC_new_kind_inner(void ** /* free_list */,
GC_word /* mark_descriptor_template */,
int /* add_size_to_descriptor */,
int /* clear_new_objects */) GC_ATTR_NONNULL(1);
/* Return a new mark procedure identifier, suitable for use as */
/* the first argument in GC_MAKE_PROC. */
GC_API unsigned GC_CALL GC_new_proc(GC_mark_proc);
GC_API unsigned GC_CALL GC_new_proc_inner(GC_mark_proc);
/* Allocate an object of a given kind. By default, there are only */
/* a few kinds: composite (pointer-free), atomic, uncollectible, etc. */
/* We claim it is possible for clever client code that understands the */
/* GC internals to add more, e.g. to communicate object layout */
/* information to the collector. Note that in the multi-threaded */
/* contexts, this is usually unsafe for kinds that have the descriptor */
/* in the object itself, since there is otherwise a window in which */
/* the descriptor is not correct. Even in the single-threaded case, */
/* we need to be sure that cleared objects on a free list don't */
/* cause a GC crash if they are accidentally traced. */
GC_API GC_ATTR_MALLOC void * GC_CALL GC_generic_malloc(size_t /* lb */,
int /* k */);
GC_API GC_ATTR_MALLOC void * GC_CALL GC_generic_malloc_ignore_off_page(
size_t /* lb */, int /* k */);
/* As above, but pointers to past the */
/* first page of the resulting object */
/* are ignored. */
typedef void (GC_CALLBACK * GC_describe_type_fn)(void * /* p */,
char * /* out_buf */);
/* A procedure which */
/* produces a human-readable */
/* description of the "type" of object */
/* p into the buffer out_buf of length */
/* GC_TYPE_DESCR_LEN. This is used by */
/* the debug support when printing */
/* objects. */
/* These functions should be as robust */
/* as possible, though we do avoid */
/* invoking them on objects on the */
/* global free list. */
#define GC_TYPE_DESCR_LEN 40
GC_API void GC_CALL GC_register_describe_type_fn(int /* kind */,
GC_describe_type_fn);
/* Register a describe_type function */
/* to be used when printing objects */
/* of a particular kind. */
/* Clear some of the inaccessible part of the stack. Returns its */
/* argument, so it can be used in a tail call position, hence clearing */
/* another frame. Argument may be NULL. */
GC_API void * GC_CALL GC_clear_stack(void *);
/* Set and get the client notifier on collections. The client function */
/* is called at the start of every full GC (called with the allocation */
/* lock held). May be 0. This is a really tricky interface to use */
/* correctly. Unless you really understand the collector internals, */
/* the callback should not, directly or indirectly, make any GC_ or */
/* potentially blocking calls. In particular, it is not safe to */
/* allocate memory using the garbage collector from within the callback */
/* function. Both the setter and getter acquire the GC lock. */
typedef void (GC_CALLBACK * GC_start_callback_proc)(void);
GC_API void GC_CALL GC_set_start_callback(GC_start_callback_proc);
GC_API GC_start_callback_proc GC_CALL GC_get_start_callback(void);
/* Slow/general mark bit manipulation. The caller must hold the */
/* allocation lock. GC_is_marked returns 1 (TRUE) or 0. */
GC_API int GC_CALL GC_is_marked(const void *) GC_ATTR_NONNULL(1);
GC_API void GC_CALL GC_clear_mark_bit(const void *) GC_ATTR_NONNULL(1);
GC_API void GC_CALL GC_set_mark_bit(const void *) GC_ATTR_NONNULL(1);
/* Push everything in the given range onto the mark stack. */
/* (GC_push_conditional pushes either all or only dirty pages depending */
/* on the third argument.) */
GC_API void GC_CALL GC_push_all(char * /* bottom */, char * /* top */);
GC_API void GC_CALL GC_push_conditional(char * /* bottom */, char * /* top */,
int /* bool all */);
/* Set and get the client push-other-roots procedure. A client */
/* supplied procedure should also call the original procedure. */
/* Note that both the setter and getter require some external */
/* synchronization to avoid data race. */
typedef void (GC_CALLBACK * GC_push_other_roots_proc)(void);
GC_API void GC_CALL GC_set_push_other_roots(GC_push_other_roots_proc);
GC_API GC_push_other_roots_proc GC_CALL GC_get_push_other_roots(void);
#ifdef __cplusplus
} /* end of extern "C" */
#endif
#endif /* GC_MARK_H */
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