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#ifndef RBIMPL_RGENGC_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_RGENGC_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 RGENGC write-barrier APIs.
* @see Sasada, K., "Gradual write-barrier insertion into a Ruby
* interpreter", in proceedings of the 2019 ACM SIGPLAN
* International Symposium on Memory Management (ISMM 2019), pp
* 115-121, 2019. https://doi.org/10.1145/3315573.3329986
*/
#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/maybe_unused.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/special_consts.h"
#include "ruby/internal/stdbool.h"
#include "ruby/internal/value.h"
#include "ruby/assert.h"
/**
* @private
*
* @deprecated This macro once was a thing in the old days, but makes no sense
* any longer today. Exists here for backwards compatibility
* only. You can safely forget about it.
*/
#undef USE_RGENGC
#define USE_RGENGC 1
/**
* @private
*
* This is a compile-time flag to enable/disable incremental GC feature. It
* has to be set at the time ruby itself compiles. Makes no sense for 3rd
* parties. It is safe for them to set this though; that just doesn't change
* anything.
*/
#ifndef USE_RINCGC
# define USE_RINCGC 1
#endif
/**
* @deprecated This macro seems broken. Setting this to anything other than
* zero just doesn't compile. We need to KonMari.
*/
#ifndef USE_RGENGC_LOGGING_WB_UNPROTECT
# define USE_RGENGC_LOGGING_WB_UNPROTECT 0
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RArray. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_ARRAY
# define RGENGC_WB_PROTECTED_ARRAY 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RHash. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_HASH
# define RGENGC_WB_PROTECTED_HASH 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RStruct. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_STRUCT
# define RGENGC_WB_PROTECTED_STRUCT 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RString. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_STRING
# define RGENGC_WB_PROTECTED_STRING 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RObject. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_OBJECT
# define RGENGC_WB_PROTECTED_OBJECT 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RRegexp. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_REGEXP
# define RGENGC_WB_PROTECTED_REGEXP 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RClass. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_CLASS
# define RGENGC_WB_PROTECTED_CLASS 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RFloat. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_FLOAT
# define RGENGC_WB_PROTECTED_FLOAT 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RComplex. It has to be set at the time ruby itself compiles.
* Makes no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_COMPLEX
# define RGENGC_WB_PROTECTED_COMPLEX 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RRational. It has to be set at the time ruby itself compiles.
* Makes no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_RATIONAL
# define RGENGC_WB_PROTECTED_RATIONAL 1
#endif
/**
* @private
*
* This is a compile-time flag to enable/disable write barrier for
* struct ::RBignum. It has to be set at the time ruby itself compiles. Makes
* no sense for 3rd parties.
*/
#ifndef RGENGC_WB_PROTECTED_BIGNUM
# define RGENGC_WB_PROTECTED_BIGNUM 1
#endif
/**
* @private
*
* @deprecated This macro once was a thing in the old days, but makes no sense
* any longer today. Exists here for backwards compatibility
* only. You can safely forget about it.
*
* @internal
*
* @shyouhei doesn't think anybody uses this right now.
*/
#ifndef RGENGC_WB_PROTECTED_NODE_CREF
# define RGENGC_WB_PROTECTED_NODE_CREF 1
#endif
/**
* @defgroup rgengc Write barrier (WB) interfaces:
*
* @note The following core interfaces can be changed in the future. Please
* catch up if you want to insert WB into C-extensions correctly.
*
* @{
*/
/**
* Declaration of a "back" pointer. This is a write barrier for new reference
* from "old" generation to "young" generation. It writes `young` into
* `*slot`, which is a pointer inside of `old`.
*
* @param[in] old An old object.
* @param[in] slot A pointer inside of `old`.
* @param[out] young A young object.
*/
#define RB_OBJ_WRITE(old, slot, young) \
RBIMPL_CAST(rb_obj_write((VALUE)(old), (VALUE *)(slot), (VALUE)(young), __FILE__, __LINE__))
/**
* Identical to #RB_OBJ_WRITE(), except it doesn't write any values, but only a
* WB declaration. `oldv` is replaced value with `b` (not used in current
* Ruby).
*
* @param[in] old An old object.
* @param[in] oldv An object previously stored inside of `old`.
* @param[out] young A young object.
*/
#define RB_OBJ_WRITTEN(old, oldv, young) \
RBIMPL_CAST(rb_obj_written((VALUE)(old), (VALUE)(oldv), (VALUE)(young), __FILE__, __LINE__))
/** @} */
#define OBJ_PROMOTED_RAW RB_OBJ_PROMOTED_RAW /**< @old{RB_OBJ_PROMOTED_RAW} */
#define OBJ_PROMOTED RB_OBJ_PROMOTED /**< @old{RB_OBJ_PROMOTED} */
#define OBJ_WB_UNPROTECT RB_OBJ_WB_UNPROTECT /**< @old{RB_OBJ_WB_UNPROTECT} */
/**
* Asserts that the passed object is not fenced by write barriers. Objects of
* such property do not contribute to generational GCs. They are scanned
* always.
*
* @param[out] x An object that would not be protected by the barrier.
*/
#define RB_OBJ_WB_UNPROTECT(x) rb_obj_wb_unprotect(x, __FILE__, __LINE__)
/**
* Identical to #RB_OBJ_WB_UNPROTECT(), except it can also assert that the
* given object is of given type.
*
* @param[in] type One of `ARRAY`, `STRING`, etc.
* @param[out] obj An object of `type` that would not be protected.
*
* @internal
*
* @shyouhei doesn't understand why this has to be visible from extensions.
*/
#define RB_OBJ_WB_UNPROTECT_FOR(type, obj) \
(RGENGC_WB_PROTECTED_##type ? OBJ_WB_UNPROTECT(obj) : obj)
/**
* @private
*
* This is an implementation detail of rb_obj_wb_unprotect(). People don't use
* it directly.
*/
#define RGENGC_LOGGING_WB_UNPROTECT rb_gc_unprotect_logging
/** @cond INTERNAL_MACRO */
#define RB_OBJ_PROMOTED_RAW RB_OBJ_PROMOTED_RAW
#define RB_OBJ_PROMOTED RB_OBJ_PROMOTED
/** @endcond */
RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
* This is the implementation of #RB_OBJ_WRITE(). People don't use it
* directly.
*
* @param[in] old An object that points to `young`.
* @param[out] young An object that is referenced from `old`.
*/
void rb_gc_writebarrier(VALUE old, VALUE young);
/**
* This is the implementation of #RB_OBJ_WB_UNPROTECT(). People don't use it
* directly.
*
* @param[out] obj An object that does not participate in WB.
*/
void rb_gc_writebarrier_unprotect(VALUE obj);
#if USE_RGENGC_LOGGING_WB_UNPROTECT
/**
* @private
*
* This is the implementation of #RGENGC_LOGGING_WB_UNPROTECT(). People
* don't use it directly.
*
* @param[in] objptr Don't know why this is a pointer to void but in
* reality this is a pointer to an object that is about
* to be un-protected.
* @param[in] filename Pass C's `__FILE__` here.
* @param[in] line Pass C's `__LINE__` here.
*/
void rb_gc_unprotect_logging(void *objptr, const char *filename, int line);
#endif
RBIMPL_SYMBOL_EXPORT_END()
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
/**
* This is the implementation of #RB_OBJ_PROMOTED(). People don't use it
* directly.
*
* @param[in] obj An object to query.
* @retval true The object is "promoted".
* @retval false The object is young. Have not experienced GC at all.
*/
static inline bool
RB_OBJ_PROMOTED_RAW(VALUE obj)
{
RBIMPL_ASSERT_OR_ASSUME(RB_FL_ABLE(obj));
return RB_FL_ANY_RAW(obj, RUBY_FL_PROMOTED);
}
RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
/**
* Tests if the object is "promoted" -- that is, whether the object experienced
* one or more GC marks.
*
* @param[in] obj An object to query.
* @retval true The object is "promoted".
* @retval false The object is young. Have not experienced GC at all.
* @note Hello, is anyone actively calling this function? @shyouhei have
* never seen any actual usages outside of the GC implementation
* itself.
*/
static inline bool
RB_OBJ_PROMOTED(VALUE obj)
{
if (! RB_FL_ABLE(obj)) {
return false;
}
else {
return RB_OBJ_PROMOTED_RAW(obj);
}
}
/**
* This is the implementation of #RB_OBJ_WB_UNPROTECT(). People don't use it
* directly.
*
* @param[out] x An object that does not participate in WB.
* @param[in] filename C's `__FILE__` of the caller function.
* @param[in] line C's `__LINE__` of the caller function.
* @return x
*/
static inline VALUE
rb_obj_wb_unprotect(
VALUE x,
RBIMPL_ATTR_MAYBE_UNUSED()
const char *filename,
RBIMPL_ATTR_MAYBE_UNUSED()
int line)
{
#if USE_RGENGC_LOGGING_WB_UNPROTECT
RGENGC_LOGGING_WB_UNPROTECT(RBIMPL_CAST((void *)x), filename, line);
#endif
rb_gc_writebarrier_unprotect(x);
return x;
}
/**
* @private
*
* This is the implementation of #RB_OBJ_WRITTEN(). People don't use it
* directly.
*
* @param[in] a An old object.
* @param[in] oldv An object previously stored inside of `old`.
* @param[out] b A young object.
* @param[in] filename C's `__FILE__` of the caller function.
* @param[in] line C's `__LINE__` of the caller function.
* @return a
*/
static inline VALUE
rb_obj_written(
VALUE a,
RBIMPL_ATTR_MAYBE_UNUSED()
VALUE oldv,
VALUE b,
RBIMPL_ATTR_MAYBE_UNUSED()
const char *filename,
RBIMPL_ATTR_MAYBE_UNUSED()
int line)
{
#if USE_RGENGC_LOGGING_WB_UNPROTECT
RGENGC_LOGGING_OBJ_WRITTEN(a, oldv, b, filename, line);
#endif
if (!RB_SPECIAL_CONST_P(b)) {
rb_gc_writebarrier(a, b);
}
return a;
}
/**
* @private
*
* This is the implementation of #RB_OBJ_WRITE(). People don't use it
* directly.
*
* @param[in] a An old object.
* @param[in] slot A pointer inside of `old`.
* @param[out] b A young object.
* @param[in] filename C's `__FILE__` of the caller function.
* @param[in] line C's `__LINE__` of the caller function.
* @return a
*/
static inline VALUE
rb_obj_write(
VALUE a, VALUE *slot, VALUE b,
RBIMPL_ATTR_MAYBE_UNUSED()
const char *filename,
RBIMPL_ATTR_MAYBE_UNUSED()
int line)
{
#ifdef RGENGC_LOGGING_WRITE
RGENGC_LOGGING_WRITE(a, slot, b, filename, line);
#endif
*slot = b;
rb_obj_written(a, RUBY_Qundef /* ignore `oldv' now */, b, filename, line);
return a;
}
#endif /* RBIMPL_RGENGC_H */
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