home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1993, 1996, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: gsmemory.h,v 1.2 2000/09/19 19:00:30 lpd Exp $ */
- /* Client interface for memory allocation */
-
- /*
- * The allocator knows about two basic kinds of memory: objects, which are
- * aligned and cannot have pointers to their interior, and strings, which
- * are not aligned and which can have interior references.
- *
- * The standard allocator is designed to interface to a garbage collector,
- * although it does not include or call one. The allocator API recognizes
- * that the garbage collector may move objects, relocating pointers to them;
- * the API provides for allocating both movable (the default) and immovable
- * objects. Clients must not attempt to resize immovable objects, and must
- * not create references to substrings of immovable strings.
- */
-
- #ifndef gsmemory_INCLUDED
- # define gsmemory_INCLUDED
-
- #include "gsmemraw.h"
-
- /* Define the opaque type for a structure descriptor. */
- typedef struct gs_memory_struct_type_s gs_memory_struct_type_t;
- typedef const gs_memory_struct_type_t *gs_memory_type_ptr_t;
-
- /* Define the opaque type for an allocator. */
- /* (The actual structure is defined later in this file.) */
- #ifndef gs_memory_DEFINED
- # define gs_memory_DEFINED
- typedef struct gs_memory_s gs_memory_t;
- #endif
-
- /* Define the opaque type for a pointer type. */
- typedef struct gs_ptr_procs_s gs_ptr_procs_t;
- typedef const gs_ptr_procs_t *gs_ptr_type_t;
-
- /* Define the opaque type for a GC root. */
- typedef struct gs_gc_root_s gs_gc_root_t;
-
- /* Accessors for structure types. */
-
- typedef client_name_t struct_name_t;
-
- /* Get the size of a structure from the descriptor. */
- uint gs_struct_type_size(P1(gs_memory_type_ptr_t));
-
- /* Get the name of a structure from the descriptor. */
- struct_name_t gs_struct_type_name(P1(gs_memory_type_ptr_t));
-
- #define gs_struct_type_name_string(styp)\
- ((const char *)gs_struct_type_name(styp))
-
- /*
- * Define the memory manager procedural interface.
- */
- typedef struct gs_memory_procs_s {
-
- gs_raw_memory_procs(gs_memory_t); /* defined in gsmemraw.h */
-
- /* Redefine inherited procedures with the new allocator type. */
-
- #define gs_memory_proc_alloc_bytes(proc)\
- gs_memory_t_proc_alloc_bytes(proc, gs_memory_t)
- #define gs_memory_proc_resize_object(proc)\
- gs_memory_t_proc_resize_object(proc, gs_memory_t)
- #define gs_memory_proc_free_object(proc)\
- gs_memory_t_proc_free_object(proc, gs_memory_t)
- #define gs_memory_proc_stable(proc)\
- gs_memory_t_proc_stable(proc, gs_memory_t)
- #define gs_memory_proc_status(proc)\
- gs_memory_t_proc_status(proc, gs_memory_t)
- #define gs_memory_proc_free_all(proc)\
- gs_memory_t_proc_free_all(proc, gs_memory_t)
- #define gs_memory_proc_consolidate_free(proc)\
- gs_memory_t_proc_consolidate_free(proc, gs_memory_t)
-
- /*
- * Allocate possibly movable bytes. (We inherit allocating immovable
- * bytes from the raw memory allocator.)
- */
-
- #define gs_alloc_bytes(mem, nbytes, cname)\
- (*(mem)->procs.alloc_bytes)(mem, nbytes, cname)
- gs_memory_proc_alloc_bytes((*alloc_bytes));
-
- /*
- * Allocate a structure.
- */
-
- #define gs_memory_proc_alloc_struct(proc)\
- void *proc(P3(gs_memory_t *mem, gs_memory_type_ptr_t pstype,\
- client_name_t cname))
- #define gs_alloc_struct(mem, typ, pstype, cname)\
- (typ *)(*(mem)->procs.alloc_struct)(mem, pstype, cname)
- gs_memory_proc_alloc_struct((*alloc_struct));
- #define gs_alloc_struct_immovable(mem, typ, pstype, cname)\
- (typ *)(*(mem)->procs.alloc_struct_immovable)(mem, pstype, cname)
- gs_memory_proc_alloc_struct((*alloc_struct_immovable));
-
- /*
- * Allocate an array of bytes.
- */
-
- #define gs_memory_proc_alloc_byte_array(proc)\
- byte *proc(P4(gs_memory_t *mem, uint num_elements, uint elt_size,\
- client_name_t cname))
- #define gs_alloc_byte_array(mem, nelts, esize, cname)\
- (*(mem)->procs.alloc_byte_array)(mem, nelts, esize, cname)
- gs_memory_proc_alloc_byte_array((*alloc_byte_array));
- #define gs_alloc_byte_array_immovable(mem, nelts, esize, cname)\
- (*(mem)->procs.alloc_byte_array_immovable)(mem, nelts, esize, cname)
- gs_memory_proc_alloc_byte_array((*alloc_byte_array_immovable));
-
- /*
- * Allocate an array of structures.
- */
-
- #define gs_memory_proc_alloc_struct_array(proc)\
- void *proc(P4(gs_memory_t *mem, uint num_elements,\
- gs_memory_type_ptr_t pstype, client_name_t cname))
- #define gs_alloc_struct_array(mem, nelts, typ, pstype, cname)\
- (typ *)(*(mem)->procs.alloc_struct_array)(mem, nelts, pstype, cname)
- gs_memory_proc_alloc_struct_array((*alloc_struct_array));
- #define gs_alloc_struct_array_immovable(mem, nelts, typ, pstype, cname)\
- (typ *)(*(mem)->procs.alloc_struct_array_immovable)(mem, nelts, pstype, cname)
- gs_memory_proc_alloc_struct_array((*alloc_struct_array_immovable));
-
- /*
- * Get the size of an object (anything except a string).
- */
-
- #define gs_memory_proc_object_size(proc)\
- uint proc(P2(gs_memory_t *mem, const void *obj))
- #define gs_object_size(mem, obj)\
- (*(mem)->procs.object_size)(mem, obj)
- gs_memory_proc_object_size((*object_size));
-
- /*
- * Get the type of an object (anything except a string).
- * The value returned for byte objects is useful only for
- * printing.
- */
-
- #define gs_memory_proc_object_type(proc)\
- gs_memory_type_ptr_t proc(P2(gs_memory_t *mem, const void *obj))
- #define gs_object_type(mem, obj)\
- (*(mem)->procs.object_type)(mem, obj)
- gs_memory_proc_object_type((*object_type));
-
- /*
- * Allocate a string (unaligned bytes).
- */
-
- #define gs_memory_proc_alloc_string(proc)\
- byte *proc(P3(gs_memory_t *mem, uint nbytes, client_name_t cname))
- #define gs_alloc_string(mem, nbytes, cname)\
- (*(mem)->procs.alloc_string)(mem, nbytes, cname)
- gs_memory_proc_alloc_string((*alloc_string));
- #define gs_alloc_string_immovable(mem, nbytes, cname)\
- (*(mem)->procs.alloc_string_immovable)(mem, nbytes, cname)
- gs_memory_proc_alloc_string((*alloc_string_immovable));
-
- /*
- * Resize a string. The specification is the same as resize_object
- * (in gsmemraw.h), except that the element size is always a byte.
- */
-
- #define gs_memory_proc_resize_string(proc)\
- byte *proc(P5(gs_memory_t *mem, byte *data, uint old_num, uint new_num,\
- client_name_t cname))
- #define gs_resize_string(mem, data, oldn, newn, cname)\
- (*(mem)->procs.resize_string)(mem, data, oldn, newn, cname)
- gs_memory_proc_resize_string((*resize_string));
-
- /*
- * Free a string.
- */
-
- #define gs_memory_proc_free_string(proc)\
- void proc(P4(gs_memory_t *mem, byte *data, uint nbytes,\
- client_name_t cname))
- #define gs_free_string(mem, data, nbytes, cname)\
- (*(mem)->procs.free_string)(mem, data, nbytes, cname)
- gs_memory_proc_free_string((*free_string));
-
- /*
- * Register a root for the garbage collector. root = NULL
- * asks the memory manager to allocate the root object
- * itself (immovable, in the manager's parent): this is the usual
- * way to call this procedure.
- */
-
- #define gs_memory_proc_register_root(proc)\
- int proc(P5(gs_memory_t *mem, gs_gc_root_t *root, gs_ptr_type_t ptype,\
- void **pp, client_name_t cname))
- #define gs_register_root(mem, root, ptype, pp, cname)\
- (*(mem)->procs.register_root)(mem, root, ptype, pp, cname)
- gs_memory_proc_register_root((*register_root));
-
- /*
- * Unregister a root. The root object itself will be freed iff
- * it was allocated by gs_register_root.
- */
-
- #define gs_memory_proc_unregister_root(proc)\
- void proc(P3(gs_memory_t *mem, gs_gc_root_t *root, client_name_t cname))
- #define gs_unregister_root(mem, root, cname)\
- (*(mem)->procs.unregister_root)(mem, root, cname)
- gs_memory_proc_unregister_root((*unregister_root));
-
- /*
- * Enable or disable the freeing operations: when disabled,
- * these operations return normally but do nothing. The
- * garbage collector and the PostScript interpreter
- * 'restore' operator need to temporarily disable the
- * freeing functions of (an) allocator(s) while running
- * finalization procedures.
- */
-
- #define gs_memory_proc_enable_free(proc)\
- void proc(P2(gs_memory_t *mem, bool enable))
- #define gs_enable_free(mem, enable)\
- (*(mem)->procs.enable_free)(mem, enable)
- gs_memory_proc_enable_free((*enable_free));
-
- } gs_memory_procs_t;
-
- /*
- * Define versions of the freeing procedures that are applicable even if the
- * pointer is declared as const T *. These are intended for use where a
- * structure contains a pointer member whose referent is declared as const
- * because it is const for all ordinary clients.
- */
- void gs_free_const_object(P3(gs_memory_t *mem, const void *data,
- client_name_t cname));
- void gs_free_const_string(P4(gs_memory_t *mem, const byte *data, uint nbytes,
- client_name_t cname));
-
- /*
- * Either allocate (if obj == 0) or resize (if obj != 0) a structure array.
- * If obj != 0, pstype is used only for checking (in DEBUG configurations).
- */
- void *gs_resize_struct_array(P5(gs_memory_t *mem, void *obj, uint num_elements,
- gs_memory_type_ptr_t pstype,
- client_name_t cname));
-
- /* Register a structure root. This just calls gs_register_root. */
- int gs_register_struct_root(P4(gs_memory_t *mem, gs_gc_root_t *root,
- void **pp, client_name_t cname));
-
- /* Define no-op freeing procedures for use by enable_free. */
- gs_memory_proc_free_object(gs_ignore_free_object);
- gs_memory_proc_free_string(gs_ignore_free_string);
-
- /* Define a no-op consolidation procedure. */
- gs_memory_proc_consolidate_free(gs_ignore_consolidate_free);
-
- /*
- * Allocate a structure using a "raw memory" allocator. Note that this does
- * not retain the identity of the structure. Note also that it returns a
- * void *, and does not take the type of the returned pointer as a
- * parameter.
- */
- void *gs_raw_alloc_struct_immovable(P3(gs_raw_memory_t * rmem,
- gs_memory_type_ptr_t pstype,
- client_name_t cname));
-
- /*
- * Define an abstract allocator instance.
- * Subclasses may have state as well.
- * Note that the initial part of this must match gs_raw_memory_t.
- */
- #define gs_memory_common\
- gs_memory_t *stable_memory;\
- gs_memory_procs_t procs
- struct gs_memory_s {
- gs_memory_common;
- };
-
- #endif /* gsmemory_INCLUDED */
-