зеркало из https://github.com/github/ruby.git
Merge internal/intern/gc.h into internal/gc.h
This commit is contained in:
Matt Valentine-House
Aaron Patterson
Родитель
2f7270c681
Коммит
ae5e62ee90
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@ -36,7 +36,6 @@
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#include "ruby/internal/intern/error.h"
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#include "ruby/internal/intern/eval.h"
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#include "ruby/internal/intern/file.h"
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#include "ruby/internal/intern/gc.h"
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#include "ruby/internal/intern/hash.h"
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#include "ruby/internal/intern/io.h"
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#include "ruby/internal/intern/load.h"
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|
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@ -20,11 +20,374 @@
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* extension libraries. They could be written in C++98.
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* @brief Registering values to the GC.
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*/
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|
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#include "ruby/internal/config.h"
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|
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#ifdef STDC_HEADERS
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# include <stddef.h> /* size_t */
|
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#endif
|
||||
|
||||
#ifdef HAVE_SYS_TYPES_H
|
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# include <sys/types.h> /* ssize_t */
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#endif
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|
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#include "ruby/internal/attr/cold.h"
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||||
#include "ruby/internal/attr/nonnull.h"
|
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#include "ruby/internal/attr/noreturn.h"
|
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#include "ruby/internal/attr/pure.h"
|
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#include "ruby/internal/dllexport.h"
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#include "ruby/internal/value.h"
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RBIMPL_SYMBOL_EXPORT_BEGIN()
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/* gc.c */
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|
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RBIMPL_ATTR_COLD()
|
||||
RBIMPL_ATTR_NORETURN()
|
||||
/**
|
||||
* Triggers out-of-memory error. If possible it raises ::rb_eNoMemError. But
|
||||
* because we are running out of memory that is not always doable. This
|
||||
* function tries hard to show something, but ultimately can die silently.
|
||||
*
|
||||
* @exception rb_eNoMemError Raises it if possible.
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*/
|
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void rb_memerror(void);
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|
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RBIMPL_ATTR_PURE()
|
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/**
|
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* Queries if the GC is busy.
|
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*
|
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* @retval 0 It isn't.
|
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* @retval 1 It is.
|
||||
*/
|
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int rb_during_gc(void);
|
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|
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RBIMPL_ATTR_NONNULL((1))
|
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/**
|
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* Marks objects between the two pointers. This is one of the GC utility
|
||||
* functions that you can call when you design your own
|
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* ::rb_data_type_struct::dmark.
|
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*
|
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* @pre Continuous memory region from `start` to `end` shall be fully
|
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* addressable.
|
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* @param[out] start Pointer to an array of objects.
|
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* @param[out] end Pointer that terminates the array of objects.
|
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* @post Objects from `start` (included) to `end` (excluded) are marked.
|
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*
|
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* @internal
|
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*
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* `end` can be NULL... But that just results in no-op.
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*/
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void rb_gc_mark_locations(const VALUE *start, const VALUE *end);
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|
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/**
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* Identical to rb_mark_hash(), except it marks only values of the table and
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* leave their associated keys unmarked. This is one of the GC utility
|
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* functions that you can call when you design your own
|
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* ::rb_data_type_struct::dmark.
|
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*
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* @warning Of course it can break GC. Leave it unused if unsure.
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* @param[in] tbl A table to mark.
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* @post Values stored in `tbl` are marked.
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*/
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void rb_mark_tbl(struct st_table *tbl);
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|
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/**
|
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* Identical to rb_mark_tbl(), except it marks objects using
|
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* rb_gc_mark_movable(). This is one of the GC utility functions that you can
|
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* call when you design your own ::rb_data_type_struct::dmark.
|
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*
|
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* @warning Of course it can break GC. Leave it unused if unsure.
|
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* @param[in] tbl A table to mark.
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* @post Values stored in `tbl` are marked.
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*/
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void rb_mark_tbl_no_pin(struct st_table *tbl);
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|
||||
/**
|
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* Identical to rb_mark_hash(), except it marks only keys of the table and
|
||||
* leave their associated values unmarked. This is one of the GC utility
|
||||
* functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @warning Of course it can break GC. Leave it unused if unsure.
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||||
* @param[in] tbl A table to mark.
|
||||
* @post Keys stored in `tbl` are marked.
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*/
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void rb_mark_set(struct st_table *tbl);
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||||
|
||||
/**
|
||||
* Marks keys and values associated inside of the given table. This is one of
|
||||
* the GC utility functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @param[in] tbl A table to mark.
|
||||
* @post Objects stored in `tbl` are marked.
|
||||
*/
|
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void rb_mark_hash(struct st_table *tbl);
|
||||
|
||||
/**
|
||||
* Updates references inside of tables. After you marked values using
|
||||
* rb_mark_tbl_no_pin(), the objects inside of the table could of course be
|
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* moved. This function is to fixup those references. You can call this from
|
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* your ::rb_data_type_struct::dcompact.
|
||||
*
|
||||
* @param[out] ptr A table that potentially includes moved references.
|
||||
* @post Moved references, if any, are corrected.
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||||
*/
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void rb_gc_update_tbl_refs(st_table *ptr);
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||||
|
||||
/**
|
||||
* Identical to rb_gc_mark(), except it allows the passed value be a
|
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* non-object. For instance pointers to different type of memory regions are
|
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* allowed here. Such values are silently ignored. This is one of the GC
|
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* utility functions that you can call when you design your own
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* ::rb_data_type_struct::dmark.
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*
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* @param[out] obj A possible object.
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||||
* @post `obj` is marked, if possible.
|
||||
*/
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void rb_gc_mark_maybe(VALUE obj);
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|
||||
/**
|
||||
* Marks an object. This is one of the GC utility functions that you can call
|
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* when you design your own ::rb_data_type_struct::dmark.
|
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*
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* @param[out] obj Arbitrary Ruby object.
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* @post `obj` is marked.
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*/
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void rb_gc_mark(VALUE obj);
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/**
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* Maybe this is the only function provided for C extensions to control the
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* pinning of objects, so let us describe it in detail. These days Ruby's GC
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* is copying. As far as an object's physical address is guaranteed unused, it
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* can move around the object space. Our GC engine rearranges these objects
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||||
* after it reclaims unreachable objects from our object space, so that the
|
||||
* space is compact (improves memory locality). This is called the
|
||||
* "compaction" phase, and works well most of the time... as far as there are
|
||||
* no C extensions. C extensions complicate the scenario because Ruby core
|
||||
* cannot detect any use of the physical address of an object inside of C
|
||||
* functions. In order to prevent memory corruptions, objects observable from
|
||||
* C extensions are "pinned"; they stick to where they are born until they die,
|
||||
* just in case any C extensions touch their raw pointers. This variant of
|
||||
* scheme is called "Mostly-Copying" garbage collector. Authors of C
|
||||
* extensions, however, can extremely carefully write them to become
|
||||
* compaction-aware. To do so avoid referring to a Ruby object from inside of
|
||||
* your struct in the first place. But if that is not possible, use this
|
||||
* function from your ::rb_data_type_struct::dmark then. This way objects
|
||||
* marked using it are considered movable. If you chose this way you have to
|
||||
* manually fix up locations of such moved pointers using rb_gc_location().
|
||||
*
|
||||
* @see Bartlett, Joel F., "Compacting Garbage Collection with Ambiguous
|
||||
* Roots", ACM SIGPLAN Lisp Pointers Volume 1 Issue 6 pp. 3-12,
|
||||
* April-May-June, 1988. https://doi.org/10.1145/1317224.1317225
|
||||
*
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||||
* @param[in] obj Object that is movable.
|
||||
* @post Values stored in `tbl` are marked.
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||||
*/
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||||
void rb_gc_mark_movable(VALUE obj);
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||||
|
||||
/**
|
||||
* Finds a new "location" of an object. An object can be moved on compaction.
|
||||
* This function projects its new abode, or just returns the passed object if
|
||||
* not moved. This is one of the GC utility functions that you can call when
|
||||
* you design your own ::rb_data_type_struct::dcompact.
|
||||
*
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||||
* @param[in] obj An object, possibly already moved to somewhere else.
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||||
* @return An object, which holds the current contents of former `obj`.
|
||||
*/
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VALUE rb_gc_location(VALUE obj);
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||||
|
||||
/**
|
||||
* Asserts that the passed object is no longer needed. Such objects are
|
||||
* reclaimed sooner or later so this function is not mandatory. But sometimes
|
||||
* you can know from your application knowledge that an object is surely dead
|
||||
* at some point. Calling this as a hint can be a polite way.
|
||||
*
|
||||
* @param[out] obj Object, dead.
|
||||
* @pre `obj` have never been passed to this function before.
|
||||
* @post `obj` could be invalidated.
|
||||
* @warning It is a failure to pass an object multiple times to this
|
||||
* function.
|
||||
* @deprecated This is now a no-op function.
|
||||
*/
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||||
RBIMPL_ATTR_DEPRECATED(("this is now a no-op function"))
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||||
void rb_gc_force_recycle(VALUE obj);
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||||
|
||||
/**
|
||||
* Triggers a GC process. This was the only GC entry point that we had at the
|
||||
* beginning. Over time our GC evolved. Now what this function does is just a
|
||||
* very simplified variation of the entire GC algorithms. A series of
|
||||
* procedures kicked by this API is called a "full" GC.
|
||||
*
|
||||
* - It immediately scans the entire object space to sort the dead.
|
||||
* - It immediately reclaims any single dead bodies to reuse later.
|
||||
*
|
||||
* It is worth noting that the procedures above do not include evaluations of
|
||||
* finalisers. They run later.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* Finalisers are deferred until we can handle interrupts. See
|
||||
* `rb_postponed_job_flush` in vm_trace.c.
|
||||
*
|
||||
* Of course there are GC that are not "full". For instance this one and the
|
||||
* GC which runs when we are running out of memory are different. See
|
||||
* `gc_profile_record_flag` defined in gc.c for the kinds of GC.
|
||||
*
|
||||
* In spite of the name this is not what everything that a GC can trigger. As
|
||||
* of writing it seems this function does not trigger compaction. But this
|
||||
* might change in future.
|
||||
*/
|
||||
void rb_gc(void);
|
||||
|
||||
/**
|
||||
* Copy&paste an object's finaliser to another. This is one of the GC utility
|
||||
* functions that you can call when you design your own `initialize_copy`,
|
||||
* `initialize_dup`, `initialize_clone`.
|
||||
*
|
||||
* @param[out] dst Destination object.
|
||||
* @param[in] src Source object.
|
||||
* @post `dst` and `src` share the same finaliser.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* But isn't it easier for you to call super, and let `Object#initialize_copy`
|
||||
* call this function instead?
|
||||
*/
|
||||
void rb_gc_copy_finalizer(VALUE dst, VALUE src);
|
||||
|
||||
/**
|
||||
* (Re-) enables GC. This makes sense only after you called rb_gc_disable().
|
||||
*
|
||||
* @retval RUBY_Qtrue GC was disabled before.
|
||||
* @retval RUBY_Qfalse GC was enabled before.
|
||||
* @post GC is enabled.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* This is one of such exceptional functions that does not raise both Ruby
|
||||
* exceptions and C++ exceptions.
|
||||
*/
|
||||
VALUE rb_gc_enable(void);
|
||||
|
||||
/**
|
||||
* Disables GC. This prevents automatic GC runs when the process is running
|
||||
* out of memory. Such situations shall result in rb_memerror(). However this
|
||||
* does not prevent users from manually invoking rb_gc(). That should work.
|
||||
* People abused this by disabling GC at the beginning of an event loop,
|
||||
* process events without GC overheads, then manually force reclaiming garbage
|
||||
* at the bottom of the loop. However because our GC is now much smarter than
|
||||
* just calling rb_gc(), this technique is proven to be sub-optimal these days.
|
||||
* It is believed that there is currently practically no needs of this
|
||||
* function.
|
||||
*
|
||||
* @retval RUBY_Qtrue GC was disabled before.
|
||||
* @retval RUBY_Qfalse GC was enabled before.
|
||||
* @post GC is disabled.
|
||||
*/
|
||||
VALUE rb_gc_disable(void);
|
||||
|
||||
/**
|
||||
* Identical to rb_gc(), except the return value.
|
||||
*
|
||||
* @return Always returns ::RUBY_Qnil.
|
||||
*/
|
||||
VALUE rb_gc_start(void);
|
||||
|
||||
/**
|
||||
* Assigns a finaliser for an object. Each objects can have objects (typically
|
||||
* blocks) that run immediately after that object dies. They are called
|
||||
* finalisers of an object. This function associates a finaliser object with a
|
||||
* target object.
|
||||
*
|
||||
* @note Note that finalisers run _after_ the object they finalise dies. You
|
||||
* cannot for instance call its methods.
|
||||
* @note If your finaliser references the object it finalises that object
|
||||
* loses any chance to become a garbage; effectively leaks memory until
|
||||
* the end of the process.
|
||||
*
|
||||
* @param[in] obj Target to finalise.
|
||||
* @param[in] block Something `call`able.
|
||||
* @exception rb_eRuntimeError Somehow `obj` cannot have finalisers.
|
||||
* @exception rb_eFrozenError `obj` is frozen.
|
||||
* @exception rb_eArgError `block` doesn't respond to `call`.
|
||||
* @return The passed `block`.
|
||||
* @post `block` runs after `obj` dies.
|
||||
*/
|
||||
VALUE rb_define_finalizer(VALUE obj, VALUE block);
|
||||
|
||||
/**
|
||||
* Modifies the object so that it has no finalisers at all. This function is
|
||||
* mainly provided for symmetry. No practical usages can be thought of.
|
||||
*
|
||||
* @param[out] obj Object to clear its finalisers.
|
||||
* @exception rb_eFrozenError `obj` is frozen.
|
||||
* @return The passed `obj`.
|
||||
* @post `obj` has no finalisers.
|
||||
* @note There is no way to undefine a specific part of many finalisers
|
||||
* that `obj` could have. All you can do is to clear them all.
|
||||
*/
|
||||
VALUE rb_undefine_finalizer(VALUE obj);
|
||||
|
||||
/**
|
||||
* Identical to rb_gc_stat(), with "count" parameter.
|
||||
*
|
||||
* @return Lifetime total number of runs of GC.
|
||||
*/
|
||||
size_t rb_gc_count(void);
|
||||
|
||||
/**
|
||||
* Obtains various GC related profiles. The parameter can be either a Symbol
|
||||
* or a Hash. If a Hash is passed, it is filled with everything currently
|
||||
* available. If a Symbol is passed just that portion is returned.
|
||||
*
|
||||
* Possible variations of keys you can pass here change from version to
|
||||
* version. You can get the list of known keys by passing an empty hash and
|
||||
* let it be filled.
|
||||
*
|
||||
* @param[in,out] key_or_buf A Symbol, or a Hash.
|
||||
* @exception rb_eTypeError Neither Symbol nor Hash.
|
||||
* @exception rb_eFrozenError Frozen hash is passed.
|
||||
* @return In case a Hash is passed it returns 0. Otherwise the
|
||||
* profile value associated with the given key is returned.
|
||||
* @post In case a Hash is passed it is filled with values.
|
||||
*/
|
||||
size_t rb_gc_stat(VALUE key_or_buf);
|
||||
|
||||
/**
|
||||
* Obtains various info regarding the most recent GC run. This includes for
|
||||
* instance the reason of the GC. The parameter can be either a Symbol or a
|
||||
* Hash. If a Hash is passed, it is filled with everything currently
|
||||
* available. If a Symbol is passed just that portion is returned.
|
||||
*
|
||||
* Possible variations of keys you can pass here change from version to
|
||||
* version. You can get the list of known keys by passing an empty hash and
|
||||
* let it be filled.
|
||||
*
|
||||
* @param[in,out] key_or_buf A Symbol, or a Hash.
|
||||
* @exception rb_eTypeError Neither Symbol nor Hash.
|
||||
* @exception rb_eFrozenError Frozen hash is passed.
|
||||
* @return In case a Hash is passed it returns that hash. Otherwise
|
||||
* the profile value associated with the given key is returned.
|
||||
* @post In case a Hash is passed it is filled with values.
|
||||
*/
|
||||
VALUE rb_gc_latest_gc_info(VALUE key_or_buf);
|
||||
|
||||
/**
|
||||
* Informs that there are external memory usages. Our GC runs when we are
|
||||
* running out of memory. The amount of memory, however, can increase/decrease
|
||||
* behind-the-scene. For instance DLLs can allocate memories using `mmap(2)`
|
||||
* etc, which are opaque to us. Registering such external allocations using
|
||||
* this function enables proper detection of how much memories an object used
|
||||
* as a whole. That will trigger GCs more often than it would otherwise. You
|
||||
* can also pass negative numbers here, to indicate that such external
|
||||
* allocations are gone.
|
||||
*
|
||||
* @param[in] diff Amount of memory increased(+)/decreased(-).
|
||||
*/
|
||||
void rb_gc_adjust_memory_usage(ssize_t diff);
|
||||
|
||||
/**
|
||||
* Inform the garbage collector that `valptr` points to a live Ruby object that
|
||||
* should not be moved. Note that extensions should use this API on global
|
||||
|
|
|
|||
|
|
@ -1,392 +0,0 @@
|
|||
#ifndef RBIMPL_INTERN_GC_H /*-*-C++-*-vi:se ft=cpp:*/
|
||||
#define RBIMPL_INTERN_GC_H
|
||||
/**
|
||||
* @file
|
||||
* @author Ruby developers <ruby-core@ruby-lang.org>
|
||||
* @copyright This file is a part of the programming language Ruby.
|
||||
* Permission is hereby granted, to either redistribute and/or
|
||||
* modify this file, provided that the conditions mentioned in the
|
||||
* file COPYING are met. Consult the file for details.
|
||||
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
|
||||
* implementation details. Don't take them as canon. They could
|
||||
* rapidly appear then vanish. The name (path) of this header file
|
||||
* is also an implementation detail. Do not expect it to persist
|
||||
* at the place it is now. Developers are free to move it anywhere
|
||||
* anytime at will.
|
||||
* @note To ruby-core: remember that this header can be possibly
|
||||
* recursively included from extension libraries written in C++.
|
||||
* Do not expect for instance `__VA_ARGS__` is always available.
|
||||
* We assume C99 for ruby itself but we don't assume languages of
|
||||
* extension libraries. They could be written in C++98.
|
||||
* @brief Public APIs related to ::rb_mGC.
|
||||
*/
|
||||
#include "ruby/internal/config.h"
|
||||
|
||||
#ifdef STDC_HEADERS
|
||||
# include <stddef.h> /* size_t */
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_SYS_TYPES_H
|
||||
# include <sys/types.h> /* ssize_t */
|
||||
#endif
|
||||
|
||||
#include "ruby/internal/attr/cold.h"
|
||||
#include "ruby/internal/attr/noreturn.h"
|
||||
#include "ruby/internal/attr/nonnull.h"
|
||||
#include "ruby/internal/attr/pure.h"
|
||||
#include "ruby/internal/dllexport.h"
|
||||
#include "ruby/internal/value.h"
|
||||
|
||||
RBIMPL_SYMBOL_EXPORT_BEGIN()
|
||||
|
||||
/* gc.c */
|
||||
|
||||
RBIMPL_ATTR_COLD()
|
||||
RBIMPL_ATTR_NORETURN()
|
||||
/**
|
||||
* Triggers out-of-memory error. If possible it raises ::rb_eNoMemError. But
|
||||
* because we are running out of memory that is not always doable. This
|
||||
* function tries hard to show something, but ultimately can die silently.
|
||||
*
|
||||
* @exception rb_eNoMemError Raises it if possible.
|
||||
*/
|
||||
void rb_memerror(void);
|
||||
|
||||
RBIMPL_ATTR_PURE()
|
||||
/**
|
||||
* Queries if the GC is busy.
|
||||
*
|
||||
* @retval 0 It isn't.
|
||||
* @retval 1 It is.
|
||||
*/
|
||||
int rb_during_gc(void);
|
||||
|
||||
RBIMPL_ATTR_NONNULL((1))
|
||||
/**
|
||||
* Marks objects between the two pointers. This is one of the GC utility
|
||||
* functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @pre Continuous memory region from `start` to `end` shall be fully
|
||||
* addressable.
|
||||
* @param[out] start Pointer to an array of objects.
|
||||
* @param[out] end Pointer that terminates the array of objects.
|
||||
* @post Objects from `start` (included) to `end` (excluded) are marked.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* `end` can be NULL... But that just results in no-op.
|
||||
*/
|
||||
void rb_gc_mark_locations(const VALUE *start, const VALUE *end);
|
||||
|
||||
/**
|
||||
* Identical to rb_mark_hash(), except it marks only values of the table and
|
||||
* leave their associated keys unmarked. This is one of the GC utility
|
||||
* functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @warning Of course it can break GC. Leave it unused if unsure.
|
||||
* @param[in] tbl A table to mark.
|
||||
* @post Values stored in `tbl` are marked.
|
||||
*/
|
||||
void rb_mark_tbl(struct st_table *tbl);
|
||||
|
||||
/**
|
||||
* Identical to rb_mark_tbl(), except it marks objects using
|
||||
* rb_gc_mark_movable(). This is one of the GC utility functions that you can
|
||||
* call when you design your own ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @warning Of course it can break GC. Leave it unused if unsure.
|
||||
* @param[in] tbl A table to mark.
|
||||
* @post Values stored in `tbl` are marked.
|
||||
*/
|
||||
void rb_mark_tbl_no_pin(struct st_table *tbl);
|
||||
|
||||
/**
|
||||
* Identical to rb_mark_hash(), except it marks only keys of the table and
|
||||
* leave their associated values unmarked. This is one of the GC utility
|
||||
* functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @warning Of course it can break GC. Leave it unused if unsure.
|
||||
* @param[in] tbl A table to mark.
|
||||
* @post Keys stored in `tbl` are marked.
|
||||
*/
|
||||
void rb_mark_set(struct st_table *tbl);
|
||||
|
||||
/**
|
||||
* Marks keys and values associated inside of the given table. This is one of
|
||||
* the GC utility functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @param[in] tbl A table to mark.
|
||||
* @post Objects stored in `tbl` are marked.
|
||||
*/
|
||||
void rb_mark_hash(struct st_table *tbl);
|
||||
|
||||
/**
|
||||
* Updates references inside of tables. After you marked values using
|
||||
* rb_mark_tbl_no_pin(), the objects inside of the table could of course be
|
||||
* moved. This function is to fixup those references. You can call this from
|
||||
* your ::rb_data_type_struct::dcompact.
|
||||
*
|
||||
* @param[out] ptr A table that potentially includes moved references.
|
||||
* @post Moved references, if any, are corrected.
|
||||
*/
|
||||
void rb_gc_update_tbl_refs(st_table *ptr);
|
||||
|
||||
/**
|
||||
* Identical to rb_gc_mark(), except it allows the passed value be a
|
||||
* non-object. For instance pointers to different type of memory regions are
|
||||
* allowed here. Such values are silently ignored. This is one of the GC
|
||||
* utility functions that you can call when you design your own
|
||||
* ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @param[out] obj A possible object.
|
||||
* @post `obj` is marked, if possible.
|
||||
*/
|
||||
void rb_gc_mark_maybe(VALUE obj);
|
||||
|
||||
/**
|
||||
* Marks an object. This is one of the GC utility functions that you can call
|
||||
* when you design your own ::rb_data_type_struct::dmark.
|
||||
*
|
||||
* @param[out] obj Arbitrary Ruby object.
|
||||
* @post `obj` is marked.
|
||||
*/
|
||||
void rb_gc_mark(VALUE obj);
|
||||
|
||||
/**
|
||||
* Maybe this is the only function provided for C extensions to control the
|
||||
* pinning of objects, so let us describe it in detail. These days Ruby's GC
|
||||
* is copying. As far as an object's physical address is guaranteed unused, it
|
||||
* can move around the object space. Our GC engine rearranges these objects
|
||||
* after it reclaims unreachable objects from our object space, so that the
|
||||
* space is compact (improves memory locality). This is called the
|
||||
* "compaction" phase, and works well most of the time... as far as there are
|
||||
* no C extensions. C extensions complicate the scenario because Ruby core
|
||||
* cannot detect any use of the physical address of an object inside of C
|
||||
* functions. In order to prevent memory corruptions, objects observable from
|
||||
* C extensions are "pinned"; they stick to where they are born until they die,
|
||||
* just in case any C extensions touch their raw pointers. This variant of
|
||||
* scheme is called "Mostly-Copying" garbage collector. Authors of C
|
||||
* extensions, however, can extremely carefully write them to become
|
||||
* compaction-aware. To do so avoid referring to a Ruby object from inside of
|
||||
* your struct in the first place. But if that is not possible, use this
|
||||
* function from your ::rb_data_type_struct::dmark then. This way objects
|
||||
* marked using it are considered movable. If you chose this way you have to
|
||||
* manually fix up locations of such moved pointers using rb_gc_location().
|
||||
*
|
||||
* @see Bartlett, Joel F., "Compacting Garbage Collection with Ambiguous
|
||||
* Roots", ACM SIGPLAN Lisp Pointers Volume 1 Issue 6 pp. 3-12,
|
||||
* April-May-June, 1988. https://doi.org/10.1145/1317224.1317225
|
||||
*
|
||||
* @param[in] obj Object that is movable.
|
||||
* @post Values stored in `tbl` are marked.
|
||||
*/
|
||||
void rb_gc_mark_movable(VALUE obj);
|
||||
|
||||
/**
|
||||
* Finds a new "location" of an object. An object can be moved on compaction.
|
||||
* This function projects its new abode, or just returns the passed object if
|
||||
* not moved. This is one of the GC utility functions that you can call when
|
||||
* you design your own ::rb_data_type_struct::dcompact.
|
||||
*
|
||||
* @param[in] obj An object, possibly already moved to somewhere else.
|
||||
* @return An object, which holds the current contents of former `obj`.
|
||||
*/
|
||||
VALUE rb_gc_location(VALUE obj);
|
||||
|
||||
/**
|
||||
* Asserts that the passed object is no longer needed. Such objects are
|
||||
* reclaimed sooner or later so this function is not mandatory. But sometimes
|
||||
* you can know from your application knowledge that an object is surely dead
|
||||
* at some point. Calling this as a hint can be a polite way.
|
||||
*
|
||||
* @param[out] obj Object, dead.
|
||||
* @pre `obj` have never been passed to this function before.
|
||||
* @post `obj` could be invalidated.
|
||||
* @warning It is a failure to pass an object multiple times to this
|
||||
* function.
|
||||
* @deprecated This is now a no-op function.
|
||||
*/
|
||||
RBIMPL_ATTR_DEPRECATED(("this is now a no-op function"))
|
||||
void rb_gc_force_recycle(VALUE obj);
|
||||
|
||||
/**
|
||||
* Triggers a GC process. This was the only GC entry point that we had at the
|
||||
* beginning. Over time our GC evolved. Now what this function does is just a
|
||||
* very simplified variation of the entire GC algorithms. A series of
|
||||
* procedures kicked by this API is called a "full" GC.
|
||||
*
|
||||
* - It immediately scans the entire object space to sort the dead.
|
||||
* - It immediately reclaims any single dead bodies to reuse later.
|
||||
*
|
||||
* It is worth noting that the procedures above do not include evaluations of
|
||||
* finalisers. They run later.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* Finalisers are deferred until we can handle interrupts. See
|
||||
* `rb_postponed_job_flush` in vm_trace.c.
|
||||
*
|
||||
* Of course there are GC that are not "full". For instance this one and the
|
||||
* GC which runs when we are running out of memory are different. See
|
||||
* `gc_profile_record_flag` defined in gc.c for the kinds of GC.
|
||||
*
|
||||
* In spite of the name this is not what everything that a GC can trigger. As
|
||||
* of writing it seems this function does not trigger compaction. But this
|
||||
* might change in future.
|
||||
*/
|
||||
void rb_gc(void);
|
||||
|
||||
/**
|
||||
* Copy&paste an object's finaliser to another. This is one of the GC utility
|
||||
* functions that you can call when you design your own `initialize_copy`,
|
||||
* `initialize_dup`, `initialize_clone`.
|
||||
*
|
||||
* @param[out] dst Destination object.
|
||||
* @param[in] src Source object.
|
||||
* @post `dst` and `src` share the same finaliser.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* But isn't it easier for you to call super, and let `Object#initialize_copy`
|
||||
* call this function instead?
|
||||
*/
|
||||
void rb_gc_copy_finalizer(VALUE dst, VALUE src);
|
||||
|
||||
/**
|
||||
* (Re-) enables GC. This makes sense only after you called rb_gc_disable().
|
||||
*
|
||||
* @retval RUBY_Qtrue GC was disabled before.
|
||||
* @retval RUBY_Qfalse GC was enabled before.
|
||||
* @post GC is enabled.
|
||||
*
|
||||
* @internal
|
||||
*
|
||||
* This is one of such exceptional functions that does not raise both Ruby
|
||||
* exceptions and C++ exceptions.
|
||||
*/
|
||||
VALUE rb_gc_enable(void);
|
||||
|
||||
/**
|
||||
* Disables GC. This prevents automatic GC runs when the process is running
|
||||
* out of memory. Such situations shall result in rb_memerror(). However this
|
||||
* does not prevent users from manually invoking rb_gc(). That should work.
|
||||
* People abused this by disabling GC at the beginning of an event loop,
|
||||
* process events without GC overheads, then manually force reclaiming garbage
|
||||
* at the bottom of the loop. However because our GC is now much smarter than
|
||||
* just calling rb_gc(), this technique is proven to be sub-optimal these days.
|
||||
* It is believed that there is currently practically no needs of this
|
||||
* function.
|
||||
*
|
||||
* @retval RUBY_Qtrue GC was disabled before.
|
||||
* @retval RUBY_Qfalse GC was enabled before.
|
||||
* @post GC is disabled.
|
||||
*/
|
||||
VALUE rb_gc_disable(void);
|
||||
|
||||
/**
|
||||
* Identical to rb_gc(), except the return value.
|
||||
*
|
||||
* @return Always returns ::RUBY_Qnil.
|
||||
*/
|
||||
VALUE rb_gc_start(void);
|
||||
|
||||
/**
|
||||
* Assigns a finaliser for an object. Each objects can have objects (typically
|
||||
* blocks) that run immediately after that object dies. They are called
|
||||
* finalisers of an object. This function associates a finaliser object with a
|
||||
* target object.
|
||||
*
|
||||
* @note Note that finalisers run _after_ the object they finalise dies. You
|
||||
* cannot for instance call its methods.
|
||||
* @note If your finaliser references the object it finalises that object
|
||||
* loses any chance to become a garbage; effectively leaks memory until
|
||||
* the end of the process.
|
||||
*
|
||||
* @param[in] obj Target to finalise.
|
||||
* @param[in] block Something `call`able.
|
||||
* @exception rb_eRuntimeError Somehow `obj` cannot have finalisers.
|
||||
* @exception rb_eFrozenError `obj` is frozen.
|
||||
* @exception rb_eArgError `block` doesn't respond to `call`.
|
||||
* @return The passed `block`.
|
||||
* @post `block` runs after `obj` dies.
|
||||
*/
|
||||
VALUE rb_define_finalizer(VALUE obj, VALUE block);
|
||||
|
||||
/**
|
||||
* Modifies the object so that it has no finalisers at all. This function is
|
||||
* mainly provided for symmetry. No practical usages can be thought of.
|
||||
*
|
||||
* @param[out] obj Object to clear its finalisers.
|
||||
* @exception rb_eFrozenError `obj` is frozen.
|
||||
* @return The passed `obj`.
|
||||
* @post `obj` has no finalisers.
|
||||
* @note There is no way to undefine a specific part of many finalisers
|
||||
* that `obj` could have. All you can do is to clear them all.
|
||||
*/
|
||||
VALUE rb_undefine_finalizer(VALUE obj);
|
||||
|
||||
/**
|
||||
* Identical to rb_gc_stat(), with "count" parameter.
|
||||
*
|
||||
* @return Lifetime total number of runs of GC.
|
||||
*/
|
||||
size_t rb_gc_count(void);
|
||||
|
||||
/**
|
||||
* Obtains various GC related profiles. The parameter can be either a Symbol
|
||||
* or a Hash. If a Hash is passed, it is filled with everything currently
|
||||
* available. If a Symbol is passed just that portion is returned.
|
||||
*
|
||||
* Possible variations of keys you can pass here change from version to
|
||||
* version. You can get the list of known keys by passing an empty hash and
|
||||
* let it be filled.
|
||||
*
|
||||
* @param[in,out] key_or_buf A Symbol, or a Hash.
|
||||
* @exception rb_eTypeError Neither Symbol nor Hash.
|
||||
* @exception rb_eFrozenError Frozen hash is passed.
|
||||
* @return In case a Hash is passed it returns 0. Otherwise the
|
||||
* profile value associated with the given key is returned.
|
||||
* @post In case a Hash is passed it is filled with values.
|
||||
*/
|
||||
size_t rb_gc_stat(VALUE key_or_buf);
|
||||
|
||||
/**
|
||||
* Obtains various info regarding the most recent GC run. This includes for
|
||||
* instance the reason of the GC. The parameter can be either a Symbol or a
|
||||
* Hash. If a Hash is passed, it is filled with everything currently
|
||||
* available. If a Symbol is passed just that portion is returned.
|
||||
*
|
||||
* Possible variations of keys you can pass here change from version to
|
||||
* version. You can get the list of known keys by passing an empty hash and
|
||||
* let it be filled.
|
||||
*
|
||||
* @param[in,out] key_or_buf A Symbol, or a Hash.
|
||||
* @exception rb_eTypeError Neither Symbol nor Hash.
|
||||
* @exception rb_eFrozenError Frozen hash is passed.
|
||||
* @return In case a Hash is passed it returns that hash. Otherwise
|
||||
* the profile value associated with the given key is returned.
|
||||
* @post In case a Hash is passed it is filled with values.
|
||||
*/
|
||||
VALUE rb_gc_latest_gc_info(VALUE key_or_buf);
|
||||
|
||||
/**
|
||||
* Informs that there are external memory usages. Our GC runs when we are
|
||||
* running out of memory. The amount of memory, however, can increase/decrease
|
||||
* behind-the-scene. For instance DLLs can allocate memories using `mmap(2)`
|
||||
* etc, which are opaque to us. Registering such external allocations using
|
||||
* this function enables proper detection of how much memories an object used
|
||||
* as a whole. That will trigger GCs more often than it would otherwise. You
|
||||
* can also pass negative numbers here, to indicate that such external
|
||||
* allocations are gone.
|
||||
*
|
||||
* @param[in] diff Amount of memory increased(+)/decreased(-).
|
||||
*/
|
||||
void rb_gc_adjust_memory_usage(ssize_t diff);
|
||||
|
||||
RBIMPL_SYMBOL_EXPORT_END()
|
||||
|
||||
#endif /* RBIMPL_INTERN_GC_H */
|
||||
|
|
@ -147,7 +147,7 @@ fn main() {
|
|||
// From include/ruby/internal/core/rclass.h
|
||||
.allowlist_function("rb_class_get_superclass")
|
||||
|
||||
// From include/ruby/internal/intern/gc.h
|
||||
// From include/ruby/internal/gc.h
|
||||
.allowlist_function("rb_gc_mark")
|
||||
.allowlist_function("rb_gc_mark_movable")
|
||||
.allowlist_function("rb_gc_location")
|
||||
|
|
|
|||
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