This struct encapsulates all garbage collection functionality for the D
programming language.
- void enable() [static] ¶#
-
Enables the garbage collector if collections have previously been
suspended by a call to disable. This function is reentrant, and
must be called once for every call to disable before the garbage
collector is enabled.
- void disable() [static] ¶#
-
Disables the garbage collector. This function is reentrant, but
enable must be called once for each call to disable.
- void collect() [static] ¶#
-
Begins a full collection. While the meaning of this may change based
on the garbage collector implementation, typical behavior is to scan
all stack segments for roots, mark accessible memory blocks as alive,
and then to reclaim free space. This action may need to suspend all
running threads for at least part of the collection process.
- void minimize() [static] ¶#
-
Indicates that the managed memory space be minimized by returning free
physical memory to the operating system. The amount of free memory
returned depends on the allocator design and on program behavior.
- enum BlkAttr ¶#
-
Elements for a bit field representing memory block attributes. These
are manipulated via the getAttr, setAttr, clrAttr functions.
- FINALIZE ¶#
-
Finalize the data in this block on collect.
- NO_SCAN ¶#
-
Do not scan through this block on collect.
- NO_MOVE ¶#
-
Do not move this memory block on collect.
- alias BlkInfo_ BlkInfo ¶#
-
Contains aggregate information about a block of managed memory. The
purpose of this struct is to support a more efficient query style in
instances where detailed information is needed.
base = A pointer to the base of the block in question.
size = The size of the block, calculated from base.
attr = Attribute bits set on the memory block.
- uint getAttr(void* p) [static] ¶#
-
Returns a bit field representing all block attributes set for the memory
referenced by p. If p references memory not originally allocated by this
garbage collector, points to the interior of a memory block, or if p is
null, zero will be returned.
p | A pointer to the root of a valid memory block or to null. |
A bit field containing any bits set for the memory block referenced by
p or zero on error.
- uint setAttr(void* p, uint a) [static] ¶#
-
Sets the specified bits for the memory references by p. If p references
memory not originally allocated by this garbage collector, points to the
interior of a memory block, or if p is null, no action will be performed.
p | A pointer to the root of a valid memory block or to null. |
a | A bit field containing any bits to set for this memory block.
The result of a call to getAttr after the specified bits have been
set. |
- uint clrAttr(void* p, uint a) [static] ¶#
-
Clears the specified bits for the memory references by p. If p
references memory not originally allocated by this garbage collector,
points to the interior of a memory block, or if p is null, no action
will be performed.
p | A pointer to the root of a valid memory block or to null. |
a | A bit field containing any bits to clear for this memory block. |
The result of a call to getAttr after the specified bits have been
cleared.
- void* malloc(size_t sz, uint ba = 0) [static] ¶#
-
Requests an aligned block of managed memory from the garbage collector.
This memory may be deleted at will with a call to free, or it may be
discarded and cleaned up automatically during a collection run. If
allocation fails, this function will call onOutOfMemory which is
expected to throw an OutOfMemoryException.
sz | The desired allocation size in bytes. |
ba | A bitmask of the attributes to set on this block. |
A reference to the allocated memory or null if insufficient memory
is available.
OutOfMemoryException on allocation failure.
- void* calloc(size_t sz, uint ba = 0) [static] ¶#
-
Requests an aligned block of managed memory from the garbage collector,
which is initialized with all bits set to zero. This memory may be
deleted at will with a call to free, or it may be discarded and cleaned
up automatically during a collection run. If allocation fails, this
function will call onOutOfMemory which is expected to throw an
OutOfMemoryException.
sz | The desired allocation size in bytes. |
ba | A bitmask of the attributes to set on this block. |
A reference to the allocated memory or null if insufficient memory
is available.
OutOfMemoryException on allocation failure.
- void* realloc(void* p, size_t sz, uint ba = 0) [static] ¶#
-
If sz is zero, the memory referenced by p will be deallocated as if
by a call to free. A new memory block of size sz will then be
allocated as if by a call to malloc, or the implementation may instead
resize the memory block in place. The contents of the new memory block
will be the same as the contents of the old memory block, up to the
lesser of the new and old sizes. Note that existing memory will only
be freed by realloc if sz is equal to zero. The garbage collector is
otherwise expected to later reclaim the memory block if it is unused.
If allocation fails, this function will call onOutOfMemory which is
expected to throw an OutOfMemoryException. If p references memory not
originally allocated by this garbage collector, or if it points to the
interior of a memory block, no action will be taken. If ba is zero
(the default) and p references the head of a valid, known memory block
then any bits set on the current block will be set on the new block if a
reallocation is required. If ba is not zero and p references the head
of a valid, known memory block then the bits in ba will replace those on
the current memory block and will also be set on the new block if a
reallocation is required.
p | A pointer to the root of a valid memory block or to null. |
sz | The desired allocation size in bytes. |
ba | A bitmask of the attributes to set on this block. |
A reference to the allocated memory on success or null if sz is
zero. On failure, the original value of p is returned.
OutOfMemoryException on allocation failure.
- size_t extend(void* p, size_t mx, size_t sz) [static] ¶#
-
Requests that the managed memory block referenced by p be extended in
place by at least mx bytes, with a desired extension of sz bytes. If an
extension of the required size is not possible, if p references memory
not originally allocated by this garbage collector, or if p points to
the interior of a memory block, no action will be taken.
mx | The minimum extension size in bytes. |
sz | The desired extension size in bytes. |
The size in bytes of the extended memory block referenced by p or zero
if no extension occurred.
- size_t reserve(size_t sz) [static] ¶#
-
Requests that at least sz bytes of memory be obtained from the operating
system and marked as free.
sz | The desired size in bytes. |
The actual number of bytes reserved or zero on error.
- void free(void* p) [static] ¶#
-
Deallocates the memory referenced by p. If p is null, no action
occurs. If p references memory not originally allocated by this
garbage collector, or if it points to the interior of a memory block,
no action will be taken. The block will not be finalized regardless
of whether the FINALIZE attribute is set. If finalization is desired,
use delete instead.
p | A pointer to the root of a valid memory block or to null. |
- void* addrOf(void* p) [static] ¶#
-
Returns the base address of the memory block containing p. This value
is useful to determine whether p is an interior pointer, and the result
may be passed to routines such as sizeOf which may otherwise fail. If p
references memory not originally allocated by this garbage collector, if
p is null, or if the garbage collector does not support this operation,
null will be returned.
p | A pointer to the root or the interior of a valid memory block or to
null. |
The base address of the memory block referenced by p or null on error.
- size_t sizeOf(void* p) [static] ¶#
-
Returns the true size of the memory block referenced by p. This value
represents the maximum number of bytes for which a call to realloc may
resize the existing block in place. If p references memory not
originally allocated by this garbage collector, points to the interior
of a memory block, or if p is null, zero will be returned.
p | A pointer to the root of a valid memory block or to null. |
The size in bytes of the memory block referenced by p or zero on error.
- BlkInfo query(void* p) [static] ¶#
-
Returns aggregate information about the memory block containing p. If p
references memory not originally allocated by this garbage collector, if
p is null, or if the garbage collector does not support this operation,
BlkInfo.init will be returned. Typically, support for this operation
is dependent on support for addrOf.
p | A pointer to the root or the interior of a valid memory block or to
null. |
Information regarding the memory block referenced by p or BlkInfo.init
on error.
- void addRoot(void* p) [static] ¶#
-
Adds the memory address referenced by p to an internal list of roots to
be scanned during a collection. If p is null, no operation is
performed.
p | A pointer to a valid memory address or to null. |
- void addRange(void* p, size_t sz) [static] ¶#
-
Adds the memory block referenced by p and of size sz to an internal list
of ranges to be scanned during a collection. If p is null, no operation
is performed.
p | A pointer to a valid memory address or to null. |
sz | The size in bytes of the block to add. If sz is zero then the
no operation will occur. If p is null then sz must be zero. |
- void removeRoot(void* p) [static] ¶#
-
Removes the memory block referenced by p from an internal list of roots
to be scanned during a collection. If p is null or does not represent
a value previously passed to add(void*) then no operation is performed.
p = A pointer to a valid memory address or to null.
- void removeRange(void* p) [static] ¶#
-
Removes the memory block referenced by p from an internal list of ranges
to be scanned during a collection. If p is null or does not represent
a value previously passed to add(void*, size_t) then no operation is
performed.
p | A pointer to a valid memory address or to null. |
- void* weakPointerCreate(Object o) [static] ¶#
-
Create a weak pointer to the given object.
Returns a pointer to an opaque struct allocated in C memory.
- void weakPointerDestroy(void* p) [static] ¶#
-
Destroy a weak pointer returned by weakpointerCreate().
If null is passed, nothing happens.
- Object weakPointerGet(void* p) [static] ¶#
-
Query a weak pointer and return either the object passed to
weakpointerCreate, or null if it was free'd in the meantime.
If null is passed, null is returned.
- size_t growLength(size_t newlength, size_t elSize = 1) [static] ¶#
-
returns the amount to allocate to keep some extra space
for large allocations the extra allocated space decreases, but is still enough
so that the number of reallocations when linearly growing stays logaritmic
newlength | the number of elements to allocate |
elSize | size of one element |
- size_t growLength(size_t newlength, size_t elSize, size_t a, size_t b = 0, size_t minBits = 1) [static] ¶#
-
returns the amount to allocate to keep some extra space
for large allocations the extra allocated space decreases, but is still enough
so that the number of reallocations when linearly growing stays logaritmic
newlength | the number of elements to allocate |
elSize | size of one element |
a | maximum extra space in percent (the allocated space gets rounded up, so might be larger) |
b | flatness factor, how fast the extra space decreases with array size (the larger the more constant) |
minBits | minimum number of bits of newlength |