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- /* Copyright (C) 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: gsstype.h,v 1.2 2000/09/19 19:00:32 lpd Exp $ */
- /* Definition of structure type descriptors and extern_st */
-
- #ifndef gsstype_INCLUDED
- # define gsstype_INCLUDED
-
- /* Define an opaque type for the garbage collector state. */
- typedef struct gc_state_s gc_state_t;
-
- /*
- * Define the structure used to return an enumerated pointer. Ordinary
- * object pointers use only the ptr element; strings also use size.
- */
- typedef struct enum_ptr_s {
- const void *ptr;
- uint size;
- } enum_ptr_t;
-
- /*
- * The first argument of enum_ptrs procedures formerly was not const *, and
- * EV_CONST was defined as empty. Unfortunately, changing EV_CONST to const
- * produced many compiler warnings from places that cast this argument to a
- * non-const non-void pointer type.
- */
- #define EV_CONST const
-
- /* Define the procedures for structure types. */
-
- /* Clear the marks of a structure. */
-
- #define struct_proc_clear_marks(proc)\
- void proc(P3(void /*obj_header_t*/ *pre, uint size,\
- const gs_memory_struct_type_t *pstype))
-
- /* Enumerate the pointers in a structure. */
-
- #define struct_proc_enum_ptrs(proc)\
- gs_ptr_type_t proc(P6(EV_CONST void /*obj_header_t*/ *ptr, uint size,\
- int index, enum_ptr_t *pep, const gs_memory_struct_type_t *pstype,\
- gc_state_t *gcst))
-
- /* Relocate all the pointers in this structure. */
-
- #define struct_proc_reloc_ptrs(proc)\
- void proc(P4(void /*obj_header_t*/ *ptr, uint size,\
- const gs_memory_struct_type_t *pstype, gc_state_t *gcst))
-
- /*
- * Finalize this structure just before freeing it.
- * Finalization procedures must not allocate or resize
- * any objects in any space managed by the allocator,
- * and must not assume that any objects in such spaces
- * referenced by this structure still exist. However,
- * finalization procedures may free such objects, and
- * may allocate, free, and reference objects allocated
- * in other ways, such as objects allocated with malloc
- * by libraries.
- */
-
- #define struct_proc_finalize(proc)\
- void proc(P1(void /*obj_header_t*/ *ptr))
-
- /*
- * A descriptor for an object (structure) type.
- */
- typedef struct struct_shared_procs_s struct_shared_procs_t;
-
- struct gs_memory_struct_type_s {
- uint ssize;
- struct_name_t sname;
-
- /* ------ Procedures shared among many structure types. ------ */
- /* Note that this pointer is usually 0. */
-
- const struct_shared_procs_t *shared;
-
- /* ------ Procedures specific to this structure type. ------ */
-
- struct_proc_clear_marks((*clear_marks));
- struct_proc_enum_ptrs((*enum_ptrs));
- struct_proc_reloc_ptrs((*reloc_ptrs));
- struct_proc_finalize((*finalize));
-
- /* A pointer to additional data for the above procedures. */
-
- const void *proc_data;
- };
-
- /*
- * Because of bugs in some compilers' bookkeeping for undefined structure
- * types, any file that uses extern_st must include this file.
- * (If it weren't for these bugs, the definition of extern_st could
- * go in gsmemory.h.)
- */
- #define extern_st(st) extern const gs_memory_struct_type_t st
-
- #endif /* gsstype_INCLUDED */
-