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/* Copyright (C) 1989, 1995, 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
This software is licensed to a single customer by Artifex Software Inc.
under the terms of a specific OEM agreement.
*/
/*$RCSfile$ $Revision$ */
/* Name table definition */
#ifndef inamedef_INCLUDED
# define inamedef_INCLUDED
#include "inameidx.h"
#include "inamestr.h"
#include "inames.h"
#include "gsstruct.h" /* for gc_state_t */
/*
* The name table machinery has two slightly different configurations:
* a faster one that limits the total number of names to 64K and allows
* names up to 16K in size, and a slightly slower one that limits
* the total to 4M and restricts names to 256 characters.
* The maximum number of names is 2^(16+EXTEND_NAMES)-1.
*/
#define max_name_extension_bits 6
#if EXTEND_NAMES > max_name_extension_bits
# undef EXTEND_NAMES
# define EXTEND_NAMES max_name_extension_bits
#endif
/*
* We capture the small algorithmic differences between these two
* configurations entirely in this header file;
* the implementation doesn't need any conditionals on EXTEND_NAMES.
*/
#define max_name_index (uint)((0x10000 << EXTEND_NAMES) - 1)
/* As explained below, we distinguish name indices from name counts. */
#define max_name_count max_name_index
/* ---------------- Structure definitions ---------------- */
/*
* Define the structure of a name. The pvalue member implements an
* important optimization to avoid lookup for operator and other global
* names.
*/
struct name_s {
/* pvalue specifies the definition status of the name: */
/* pvalue == pv_no_defn: no definitions */
#define pv_no_defn ((ref *)0)
/* pvalue == pv_other: other status */
#define pv_other ((ref *)1)
/* pvalue != pv_no_defn, pvalue != pv_other: pvalue is valid */
#define pv_valid(pvalue) ((unsigned long)(pvalue) > 1)
ref *pvalue; /* if only defined in systemdict or */
/* userdict, this points to the value */
};
/*typedef struct name_s name; *//* in iref.h */
/*
* Define the structure of a name table. Normally we would make this
* an opaque type, but we want to be able to in-line some of the
* access procedures.
*
* The name table is a two-level indexed table, consisting of
* sub-tables of size nt_sub_size each.
*
* First we define the name sub-table structure.
*/
#define nt_log2_sub_size NT_LOG2_SUB_SIZE /* in inameidx.h */
# define nt_sub_size (1 << nt_log2_sub_size)
# define nt_sub_index_mask (nt_sub_size - 1)
typedef struct name_sub_table_s {
name names[NT_SUB_SIZE]; /* must be first */
#ifdef EXTEND_NAMES
uint high_index; /* sub-table base index & (-1 << 16) */
#endif
} name_sub_table;
/*
* Now define the name table itself.
* This must be made visible so that the interpreter can use the
* inline macros defined below.
*/
struct name_table_s {
uint free; /* head of free list, which is sorted in */
/* increasing count (not index) order */
uint sub_next; /* index of next sub-table to allocate */
/* if not already allocated */
uint perm_count; /* # of permanent (read-only) strings */
uint sub_count; /* index of highest allocated sub-table +1 */
uint max_sub_count; /* max allowable value of sub_count */
uint name_string_attrs; /* imemory_space(memory) | a_readonly */
gs_memory_t *memory;
uint hash[NT_HASH_SIZE];
struct sub_ { /* both ptrs are 0 or both are non-0 */
name_sub_table *names;
name_string_sub_table_t *strings;
} sub[max_name_index / nt_sub_size + 1];
};
/*typedef struct name_table_s name_table; *//* in inames.h */
/* ---------------- Procedural interface ---------------- */
/*
* Convert between names, indices, and strings. Note that the inline
* versions, but not the procedure versions, take a name_table argument.
*/
/* index => string */
#define names_index_string_inline(nt, nidx)\
((nt)->sub[(nidx) >> nt_log2_sub_size].strings->strings +\
((nidx) & nt_sub_index_mask))
/* ref => string */
#define names_string_inline(nt, pnref)\
names_index_string_inline(nt, names_index_inline(nt, pnref))
/* ref => index */
#if EXTEND_NAMES
# define names_index_inline(nt_ignored, pnref)\
( ((const name_sub_table *)\
((pnref)->value.pname - (r_size(pnref) & nt_sub_index_mask)))->high_index + r_size(pnref) )
#else
# define names_index_inline(nt_ignored, pnref) r_size(pnref)
#endif
#define names_index(nt_ignored, pnref) names_index_inline(nt_ignored, pnref)
/* index => name */
#define names_index_ptr_inline(nt, nidx)\
((nt)->sub[(nidx) >> nt_log2_sub_size].names->names +\
((nidx) & nt_sub_index_mask))
/* index => ref */
#define names_index_ref_inline(nt, nidx, pnref)\
make_name(pnref, nidx, names_index_ptr_inline(nt, nidx));
/* Backward compatibility */
#define name_index_inline(pnref) names_index_inline(ignored, pnref)
#define name_index_ptr_inline(nt, pnref) names_index_ptr_inline(nt, pnref)
#define name_index_ref_inline(nt, nidx, pnref)\
names_index_ref_inline(nt, nidx, pnref)
/* name => ref */
/* We have to set the space to system so that the garbage collector */
/* won't think names are foreign and therefore untraceable. */
#define make_name(pnref, nidx, pnm)\
make_tasv(pnref, t_name, avm_system, (ushort)(nidx), pname, pnm)
/* ------ Garbage collection ------ */
/* Unmark all non-permanent names before a garbage collection. */
void names_unmark_all(P1(name_table * nt));
/* Finish tracing the name table by putting free names on the free list. */
void names_trace_finish(P2(name_table * nt, gc_state_t * gcst));
/* ------ Save/restore ------ */
/* Clean up the name table before a restore. */
#ifndef alloc_save_t_DEFINED /* also in isave.h */
typedef struct alloc_save_s alloc_save_t;
# define alloc_save_t_DEFINED
#endif
void names_restore(P2(name_table * nt, alloc_save_t * save));
#endif /* inamedef_INCLUDED */
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