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moved entity management functions to a separate file

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This commit is contained in:
hyung-hwan 2011-03-01 09:40:58 +00:00
parent 31ae7440a5
commit 1d478104b3
9 changed files with 641 additions and 1201 deletions
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2
qse/cmd/scm/scm.c
View File

@ -164,7 +164,7 @@ int scm_main (int argc, qse_char_t* argv[])
qse_scm_attachio (scm, &io);
}
qse_scm_read (scm);
qse_scm_print (scm, qse_scm_read (scm));
#if 0
while (1)

63
qse/include/qse/scm/scm.h
View File

@ -129,6 +129,24 @@ typedef qse_scm_ent_t* (*qse_scm_prim_t) (
qse_scm_ent_t* obj
);
#define QSE_SCM_ENT_ISNIL(scm,ent) ((ent) == (scm)->nil)
#define QSE_SCM_ENT_ISSMALLINT(scm,ent) ((qse_uintptr_t)(ent) & 1)
/* TODO: need more typecasting to something like int? how to i determine
* the best type for the range in CAN_BE_SMALLINT()?
#define QSE_SCM_ENT_FROMSMALLINT(x) ((int)((qse_uintptr_t)(x) >> 1))
*/
#define QSE_SCM_ENT_FROMSMALLINT(scm,ent) \
((qse_uintptr_t)(ent) >> 1)
/* TODO: change the smallint range... */
#define QSE_SCM_ENT_TOSMALLINT(scm,num) \
((qse_scm_ent_t*)(qse_uintptr_t)(((num) << 1) | 1))
#define QSE_SCM_ENT_CANBESMALLINT(scm,num) \
(((num) >= -16384) && ((num) <= 16383))
#ifdef __cplusplus
extern "C" {
#endif
@ -250,6 +268,51 @@ int qse_scm_removeprim (
const qse_char_t* name
);
qse_scm_ent_t* qse_scm_makepairent (
qse_scm_t* scm,
qse_scm_ent_t* car,
qse_scm_ent_t* cdr
);
qse_scm_ent_t* qse_scm_makenument (
qse_scm_t* scm,
qse_long_t val
);
qse_scm_ent_t* qse_scm_makerealent (
qse_scm_t* scm,
qse_long_t val
);
qse_scm_ent_t* qse_scm_makestrent (
qse_scm_t* scm,
const qse_char_t* str,
qse_size_t len
);
qse_scm_ent_t* qse_scm_makenamentity (
qse_scm_t* scm,
const qse_char_t* str
);
qse_scm_ent_t* qse_scm_makesyment (
qse_scm_t* scm,
const qse_char_t* name
);
qse_scm_ent_t* qse_scm_makesyntent (
qse_scm_t* scm,
const qse_char_t* name,
int code
);
qse_scm_ent_t* qse_scm_makeprocent (
qse_scm_t* scm,
const qse_char_t* name,
int code
);
#ifdef __cplusplus
}
#endif

2
qse/lib/scm/Makefile.am
View File

@ -8,6 +8,6 @@ AM_CPPFLAGS = \
lib_LTLIBRARIES = libqsescm.la
libqsescm_la_SOURCES = scm.h scm.c print.c err.c
libqsescm_la_SOURCES = scm.h scm.c mem.c print.c err.c
libqsescm_la_LDFLAGS = -L../cmn -L$(libdir) -version-info 1:0:0 -no-undefined
libqsescm_la_LIBADD = -lqsecmn

5
qse/lib/scm/Makefile.in
View File

@ -71,7 +71,7 @@ am__base_list = \
am__installdirs = "$(DESTDIR)$(libdir)"
LTLIBRARIES = $(lib_LTLIBRARIES)
libqsescm_la_DEPENDENCIES =
am_libqsescm_la_OBJECTS = scm.lo print.lo err.lo
am_libqsescm_la_OBJECTS = scm.lo mem.lo print.lo err.lo
libqsescm_la_OBJECTS = $(am_libqsescm_la_OBJECTS)
libqsescm_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@ -238,7 +238,7 @@ AM_CPPFLAGS = \
-I$(includedir)
lib_LTLIBRARIES = libqsescm.la
libqsescm_la_SOURCES = scm.h scm.c print.c err.c
libqsescm_la_SOURCES = scm.h scm.c mem.c print.c err.c
libqsescm_la_LDFLAGS = -L../cmn -L$(libdir) -version-info 1:0:0 -no-undefined
libqsescm_la_LIBADD = -lqsecmn
all: all-am
@ -316,6 +316,7 @@ distclean-compile:
-rm -f *.tab.c
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/err.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mem.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/print.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/scm.Plo@am__quote@

930
qse/lib/scm/mem.c
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File diff suppressed because it is too large Load Diff

100
qse/lib/scm/mem.h
View File

@ -1,100 +0,0 @@
/*
* $Id$
*
Copyright 2006-2009 Chung, Hyung-Hwan.
This file is part of QSE.
QSE is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
QSE is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with QSE. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _QSE_LIB_SCM_MEM_H_
#define _QSE_LIB_SCM_MEM_H_
#ifndef _QSE_SCM_SCM_H_
#error Never include this file directly. Include <qse/scm/scm.h> instead
#endif
enum
{
QSE_SCM_OBJ_NIL = 0,
QSE_SCM_OBJ_TRUE,
QSE_SCM_OBJ_INT,
QSE_SCM_OBJ_REAL,
QSE_SCM_OBJ_SYM,
QSE_SCM_OBJ_STR,
QSE_SCM_OBJ_CONS,
QSE_SCM_OBJ_FUNC,
QSE_SCM_OBJ_MACRO,
QSE_SCM_OBJ_PRIM,
QSE_SCM_TYPE_COUNT /* the number of lsp object types */
};
typedef struct qse_scm_mem_t qse_scm_mem_t;
struct qse_scm_mem_t
{
qse_scm_t* scm;
/* object allocation list */
qse_size_t ubound; /* upper bounds of the maximum number of objects */
qse_size_t ubound_inc; /* increment of the upper bounds */
qse_size_t count; /* the number of objects currently allocated */
qse_scm_obj_t* used[QSE_SCM_TYPE_COUNT];
qse_scm_obj_t* free[QSE_SCM_TYPE_COUNT];
struct
{
qse_scm_obj_t* obj;
qse_scm_obj_t* tmp; /* temporary datum to protect from gc in read() */
qse_scm_obj_t* stack;
} r;
/* commonly accessed objects */
qse_scm_obj_t* nil; /* qse_scm_obj_nil_t */
qse_scm_obj_t* t; /* qse_scm_obj_true_t */
qse_scm_obj_t* quote; /* qse_scm_obj_sym_t */
qse_scm_obj_t* lambda; /* qse_scm_obj_sym_t */
qse_scm_obj_t* macro; /* qse_scm_obj_sym_t */
qse_scm_obj_t* num[10]; /* qse_scm_obj_int_t */
#if 0
/* run-time environment frame */
qse_scm_frame_t* frame;
/* pointer to a global-level frame */
qse_scm_frame_t* root_frame;
/* pointer to an interim frame not yet added to "frame" */
qse_scm_frame_t* brooding_frame;
/* links for temporary objects */
qse_scm_tlink_t* tlink;
qse_size_t tlink_count;
#endif
};
#ifdef __cplusplus
extern "C" {
#endif
qse_scm_mem_t* qse_scm_initmem (
qse_scm_mem_t* mem, qse_scm_t* scm,
qse_size_t ubound, qse_size_t ubound_inc);
void qse_scm_finimem (qse_scm_mem_t* mem);
#ifdef __cplusplus
}
#endif
#endif

119
qse/lib/scm/print.c
View File

@ -36,13 +36,94 @@
} \
)
static qse_size_t long_to_str (
qse_long_t value, int radix,
const qse_char_t* prefix, qse_char_t* buf, qse_size_t size)
{
qse_long_t t, rem;
qse_size_t len, ret, i;
qse_size_t prefix_len;
prefix_len = (prefix != QSE_NULL)? qse_strlen(prefix): 0;
t = value;
if (t == 0)
{
/* zero */
if (buf == QSE_NULL)
{
/* if buf is not given,
* return the number of bytes required */
return prefix_len + 1;
}
if (size < prefix_len+1)
{
/* buffer too small */
return (qse_size_t)-1;
}
for (i = 0; i < prefix_len; i++) buf[i] = prefix[i];
buf[prefix_len] = QSE_T('0');
if (size > prefix_len+1) buf[prefix_len+1] = QSE_T('\0');
return prefix_len+1;
}
/* non-zero values */
len = prefix_len;
if (t < 0) { t = -t; len++; }
while (t > 0) { len++; t /= radix; }
if (buf == QSE_NULL)
{
/* if buf is not given, return the number of bytes required */
return len;
}
if (size < len) return (qse_size_t)-1; /* buffer too small */
if (size > len) buf[len] = QSE_T('\0');
ret = len;
t = value;
if (t < 0) t = -t;
while (t > 0)
{
rem = t % radix;
if (rem >= 10)
buf[--len] = (qse_char_t)rem + QSE_T('a') - 10;
else
buf[--len] = (qse_char_t)rem + QSE_T('0');
t /= radix;
}
if (value < 0)
{
for (i = 1; i <= prefix_len; i++)
{
buf[i] = prefix[i-1];
len--;
}
buf[--len] = QSE_T('-');
}
else
{
for (i = 0; i < prefix_len; i++) buf[i] = prefix[i];
}
return ret;
}
static int print_entity (
qse_scm_t* scm, const qse_scm_ent_t* obj, int prt_cons_par)
{
qse_char_t buf[256];
qse_long_t nval;
if (IS_SMALLINT(obj))
if (IS_SMALLINT(scm,obj))
{
nval = FROM_SMALLINT(scm,obj);
goto printnum;
}
switch (TYPE(obj))
@ -60,31 +141,17 @@ static int print_entity (
break;
case QSE_SCM_ENT_NUM:
#if QSE_SIZEOF_LONG_LONG > 0
scm->prm.sprintf (
scm->prm.udd,
buf, QSE_COUNTOF(buf),
QSE_T("%lld"), (long long)NUM_VALUE(obj));
#elif QSE_SIZEOF___INT64 > 0
scm->prm.sprintf (
scm->prm.udd,
buf, QSE_COUNTOF(buf),
QSE_T("%I64d"), (__int64)NUM_VALUE(obj));
#elif QSE_SIZEOF_LONG > 0
scm->prm.sprintf (
scm->prm.udd,
buf, QSE_COUNTOF(buf),
QSE_T("%ld"), (long)NUM_VALUE(obj));
#elif QSE_SIZEOF_INT > 0
scm->prm.sprintf (
scm->prm.udd,
buf, QSE_COUNTOF(buf),
QSE_T("%d"), (int)NUM_VALUE(obj));
#else
#error unsupported size
#endif
OUTPUT_STR (scm, buf);
{
qse_char_t tmp[QSE_SIZEOF(qse_long_t)*8+2];
qse_size_t len;
nval = NUM_VALUE(obj);
printnum:
len = long_to_str (nval, 10, QSE_NULL, tmp, QSE_COUNTOF(tmp));
OUTPUT_STRX (scm, tmp, len);
break;
}
#if 0
case QSE_SCM_ENT_REAL:
@ -122,7 +189,7 @@ static int print_entity (
{
qse_scm_print (scm, PAIR_CAR(p));
p = PAIR_CDR(p);
if (!IS_NIL(p))
if (!IS_NIL(scm,p))
{
OUTPUT_STR (scm, QSE_T(" "));
if (TYPE(p) != QSE_SCM_ENT_PAIR)

583
qse/lib/scm/scm.c
View File

@ -22,18 +22,6 @@
QSE_IMPLEMENT_COMMON_FUNCTIONS (scm)
#define IS_NIL(x) ((x) == scm->nil)
#define IS_SMALLINT(x) ((qse_uintptr_t)(x) & 1)
#define TO_SMALLINT(x) ((qse_scm_ent_t*)(qse_uintptr_t)(((x) << 1) | 1))
/* TODO: need more typecasting to something like int? how to i determine
* the best type for the range in CAN_BE_SMALLINT()?
#define FROM_SMALLINT(x) ((int)((qse_uintptr_t)(x) >> 1))
*/
#define FROM_SMALLINT(x) ((qse_uintptr_t)(x) >> 1)
/* TODO: change the smallint range... */
#define CAN_BE_SMALLINT(x) (((x) >= -16384) && ((x) <= 16383))
static qse_scm_t* qse_scm_init (
qse_scm_t* scm,
qse_mmgr_t* mmgr,
@ -45,12 +33,6 @@ static void qse_scm_fini (
qse_scm_t* scm
);
static qse_scm_ent_t* make_pair_entity (
qse_scm_t* scm,
qse_scm_ent_t* car,
qse_scm_ent_t* cdr
);
qse_scm_t* qse_scm_open (
qse_mmgr_t* mmgr, qse_size_t xtnsize,
qse_size_t mem_ubound, qse_size_t mem_ubound_inc)
@ -146,530 +128,19 @@ int qse_scm_attachio (qse_scm_t* scm, qse_scm_io_t* io)
return 0;
}
static qse_scm_enb_t* new_entity_block (qse_scm_t* scm, qse_size_t len)
{
/*
* Create a new value block containing as 'len' slots.
*/
void* raw;
qse_scm_enb_t* blk;
qse_scm_ent_t* v;
qse_size_t i;
/* Let me assume that an aligned memory pointer is an even address.
* malloc() returns an aligned memory pointer on most systems.
* However, I can't simply ignore oddball systems that returns
* an unaligned memory pointer. (Is there any?) A user may provide
* a custom memory allocator that does not return unaligned memory
* pointer. I make the pointer to an entity block 2-byte aligned
* hoping that the entity pointer alloc_entity() returns is also an
* even number. This, of couurse, requires that the size of
* qse_scm_enb_t and qse_scm_ent_t is the multiple of 2.
* I do this for SMALLINT, not for memory alignemnt.The test for
* SMALLINT can simply check the lowest bit. Am i doing too much?
*/
QSE_ASSERTX (
QSE_SIZEOF(qse_scm_enb_t) % 2 == 0,
"This function is written assuming the size of qse_scm_enb_t is even"
);
QSE_ASSERTX (
QSE_SIZEOF(qse_scm_ent_t) % 2 == 0,
"This function is written assuming the size of qse_scm_ent_t is even"
);
/* The actual memory block size is calculated as shown here:
* QSE_SIZEOF(void*) to store the actual memory block pointer
* 1 to secure extra 1 byte required for 2-byte alignement.
* QSE_SIZEOF(qse_scm_enb_t) to store the block header.
* QSE_SIZEOF(qse_Scm_ent_t) * len to store the actual entities.
*/
raw = (qse_scm_enb_t*) QSE_MMGR_ALLOC (
scm->mmgr,
QSE_SIZEOF(void*) + 1 +
QSE_SIZEOF(qse_scm_enb_t) +
QSE_SIZEOF(qse_scm_ent_t) * len
);
if (raw == QSE_NULL)
{
qse_scm_seterror (scm, QSE_SCM_ENOMEM, QSE_NULL, QSE_NULL);
return QSE_NULL;
}
/* The entity block begins after the memory block pointer. */
blk = (qse_scm_enb_t*)((qse_byte_t*)raw + QSE_SIZEOF(void*) + 1);
/* Adjust the block pointer to an even number.
* the resulting address is:
* either the old address
* or the old address - 1
*/
blk = (qse_scm_enb_t*)((qse_uintptr_t)blk & ~(qse_uintptr_t)1);
/* Remember the raw block pointer.
* ((void**)blk)[-1] gets naturally aligned as blk is aligned.
* It can be raw + 1 or the same as raw. */
((void**)blk)[-1] = raw;
/* Initialize the block fields */
blk->ptr = (qse_scm_ent_t*)(blk + 1);
blk->len = len;
/* Chain the value block to the block list */
blk->next = scm->mem.ebl;
scm->mem.ebl = blk;
/* Chain each slot to the free slot list using
* the CDR field of an entity */
v = &blk->ptr[0];
for (i = 0; i < len -1; i++)
{
qse_scm_ent_t* tmp = v++;
PAIR_CDR(tmp) = v;
}
PAIR_CDR(v) = scm->mem.free;
scm->mem.free = &blk->ptr[0];
return blk;
};
static void mark (qse_scm_t* scm, qse_scm_ent_t* v)
{
/*
* Mark values non-recursively with Deutsch-Schorr-Waite(DSW) algorithm.
* This algorithm builds backtraces directly into the value chain
* with the help of additional variables.
*/
qse_scm_ent_t* parent, * me;
if (IS_SMALLINT(v)) return;
/* Initialization */
parent = QSE_NULL;
me = v;
MARK(me) = 1;
/*if (!ATOM(me))*/ DSWCOUNT(me) = 0;
while (1)
{
if (ATOM(me) || DSWCOUNT(me) >= QSE_COUNTOF(me->u.ref.ent))
{
/*
* Backtrack to the parent node
*/
qse_scm_ent_t* child;
/* Nothing more to backtrack? end of marking */
if (parent == QSE_NULL) return;
/* Remember me temporarily for restoration below */
child = me;
/* The current parent becomes me */
me = parent;
/* Change the parent to the parent of parent */
parent = me->u.ref.ent[DSWCOUNT(me)];
/* Restore the cell contents */
me->u.ref.ent[DSWCOUNT(me)] = child;
/* Increment the counter to indicate that the
* 'count'th field has been processed. */
DSWCOUNT(me)++;
}
else
{
/*
* Move on to an unprocessed child
*/
qse_scm_ent_t* child;
child = me->u.ref.ent[DSWCOUNT(me)];
/* Process the field */
QSE_ASSERT (child != QSE_NULL);
if (IS_SMALLINT(child) || MARK(child))
{
/* Already marked. Increment the count */
DSWCOUNT(me)++;
}
else
{
/* Change the contents of the child chosen
* to point to the current parent */
me->u.ref.ent[DSWCOUNT(me)] = parent;
/* Link me to the head of parent list */
parent = me;
/* Let me point to the child chosen */
me = child;
MARK(me) = 1;
/*if (!ATOM(me))*/ DSWCOUNT(me) = 0;
}
}
}
}
static void gc (qse_scm_t* scm, qse_scm_ent_t* x, qse_scm_ent_t* y)
{
/* TODO: How can i GC away those symbols not actually meaningful?
* marking objects referenced in symbol table prevent me from
* finding unused symbols... you keep on evaluating expressions
* with different symbols. you'll get out of memory. */
mark (scm, scm->symtab);
mark (scm, scm->gloenv);
mark (scm, scm->reg.arg);
mark (scm, scm->reg.env);
mark (scm, scm->reg.cod);
mark (scm, scm->reg.dmp);
/* mark the temporaries */
if (x) mark (scm, x);
if (y) mark (scm, y);
/* scan the allocated values */
}
/*
rsr4
the following identifiers are syntactic keywors and should not be
used as variables.
=> do or
and else quasiquote
begin if quote
case lambda set!
cond let unquote
define let* unquote-splicing
delay letrec
however, you can allow for these keywords to be used as variables...
biniding, unbound...
environment.. a set of visible bindings at some point in a program.
type atom cons
number NUMBER Y
string STRING Y
symbol SYMBOL name,NIL
syntax SYNTAX|SYMBOL name,NIL
proc PROC Y
pair PAIR Y
closure
continuation
an atom does not reference any other values.
a symbol can be assoicated with property list
(put 'a 'name "brian")
(put 'a 'city "daegu")
-------------------------
(define a1 'a)
(put a1 'name "brian")
(put a1 'city "daegu")
-------------------------
(get a1 'name)
(get a1 'city)
a procedure is a privimitive routine built-in to scheme.
a closure is an anonymous routine defined with lambda.
both can be bound to a variable in the environment.
a syntax is more primitive than a procedure.
a syntax is created as if it is a symbol but not registerd
into an environment
car cdr
| STR | PTR CHR ARR | -1 |
| PROC | PROCNUM | |
| SYM | REF STR | REF PROP LIST |
| SYN | REF STR | REF PROP LIST |
*/
static qse_scm_ent_t* alloc_entity (
qse_scm_t* scm, qse_scm_ent_t* x, qse_scm_ent_t* y)
{
/* find a free value slot and return it.
* two parameters x and y are saved from garbage collection */
qse_scm_ent_t* v;
if (IS_NIL(scm->mem.free))
{
/* if no free slot is available */
gc (scm, x, y); /* perform garbage collection */
if (IS_NIL(scm->mem.free))
{
/* if no free slot is available after garbage collection,
* make new value blocks containing more free slots */
/* TODO: make the value block size configurable */
if (new_entity_block (scm, 1000) == QSE_NULL) return QSE_NULL;
QSE_ASSERT (scm->mem.free != scm->nil);
}
}
v = scm->mem.free;
scm->mem.free = PAIR_CDR(v);
return v;
}
static qse_scm_ent_t* make_pair_entity (
qse_scm_t* scm, qse_scm_ent_t* car, qse_scm_ent_t* cdr)
{
qse_scm_ent_t* v;
v = alloc_entity (scm, car, cdr);
if (v == QSE_NULL) return QSE_NULL;
TYPE(v) = QSE_SCM_ENT_PAIR;
ATOM(v) = 0; /* a pair is not an atom as it references other entities */
PAIR_CAR(v) = car;
PAIR_CDR(v) = cdr;
return v;
}
static qse_scm_ent_t* make_number_entity (qse_scm_t* scm, qse_long_t val)
{
qse_scm_ent_t* v;
if (CAN_BE_SMALLINT(val)) return TO_SMALLINT(val);
v = alloc_entity (scm, QSE_NULL, QSE_NULL);
if (v == QSE_NULL) return QSE_NULL;
TYPE(v) = QSE_SCM_ENT_NUM;
ATOM(v) = 1;
NUM_VALUE(v) = val;
return v;
}
static qse_scm_ent_t* make_real_entity (qse_scm_t* scm, qse_long_t val)
{
qse_scm_ent_t* v;
v = alloc_entity (scm, QSE_NULL, QSE_NULL);
if (v == QSE_NULL) return QSE_NULL;
TYPE(v) = QSE_SCM_ENT_REAL;
ATOM(v) = 1;
REAL_VALUE(v) = val;
return v;
}
static qse_scm_ent_t* make_string_entity (
qse_scm_t* scm, const qse_char_t* str, qse_size_t len)
{
qse_scm_ent_t* v;
v = alloc_entity (scm, QSE_NULL, QSE_NULL);
if (v == QSE_NULL) return QSE_NULL;
TYPE(v) = QSE_SCM_ENT_STR;
ATOM(v) = 1;
/* TODO: allocate a string from internal managed region .
Calling strdup is not an option as it is not managed...
*/
STR_PTR(v) = qse_strxdup (str, len, QSE_MMGR(scm));
if (STR_PTR(v) == QSE_NULL)
{
qse_scm_seterror (scm, QSE_SCM_ENOMEM, QSE_NULL, QSE_NULL);
return QSE_NULL;
}
STR_LEN(v) = len;
return v;
}
static qse_scm_ent_t* make_name_entity (qse_scm_t* scm, const qse_char_t* str)
{
qse_scm_ent_t* v;
v = alloc_entity (scm, QSE_NULL, QSE_NULL);
if (v == QSE_NULL) return QSE_NULL;
TYPE(v) = QSE_SCM_ENT_NAM;
ATOM(v) = 1;
/* TODO: allocate a string from internal managed region .
Calling strdup is not an option as it is not managed...
*/
LAB_PTR(v) = qse_strdup (str, QSE_MMGR(scm));
if (LAB_PTR(v) == QSE_NULL)
{
qse_scm_seterror (scm, QSE_SCM_ENOMEM, QSE_NULL, QSE_NULL);
return QSE_NULL;
}
LAB_CODE(v) = 0;
return v;
}
static qse_scm_ent_t* make_symbol_entity (qse_scm_t* scm, const qse_char_t* name)
{
qse_scm_ent_t* pair, * sym, * nam;
/* TODO: use a hash table, red-black tree to maintain symbol table
* The current linear search algo is not performance friendly...
*/
/* find if the symbol already exists by traversing the pair list
* and inspecting the symbol name pointed to by CAR of each pair.
*
* the symbol table is a list of pairs whose CAR points to a symbol
* and CDR is used for chaining.
*
* +-----+-----+
* | | |
* +-----+-----+
* car | | cdr +-----+-----+
* | +----------> | | |
* V +-----+-----+
* +--------+ car |
* | symbol | V
* +--------+ +--------+
* | symbol |
* +--------+
*/
for (pair = scm->symtab; !IS_NIL(pair); pair = PAIR_CDR(pair))
{
sym = PAIR_CAR(pair);
if (qse_strcmp(name, LAB_PTR(SYM_NAME(sym))) == 0) return sym;
}
/* no existing symbol with such a name is found.
* let's create a new symbol. the first step is to create a
* string entity to contain the symbol name */
nam = make_name_entity (scm, name);
if (nam == QSE_NULL) return QSE_NULL;
/* let's allocate the actual symbol entity that references the
* the symbol name entity created above */
sym = alloc_entity (scm, nam, QSE_NULL);
if (sym == QSE_NULL) return QSE_NULL;
TYPE(sym) = QSE_SCM_ENT_SYM;
ATOM(sym) = 0;
SYM_NAME(sym) = nam;
SYM_PROP(sym) = scm->nil; /* no properties yet */
/* chain the symbol entity to the symbol table for lookups later */
pair = make_pair_entity (scm, sym, scm->symtab);
if (pair == QSE_NULL) return QSE_NULL;
scm->symtab = pair;
return sym;
}
static qse_scm_ent_t* make_syntax_entity (
qse_scm_t* scm, const qse_char_t* name, int code)
{
qse_scm_ent_t* v;
QSE_ASSERTX (code > 0, "Syntax code must be greater than 0");
v = make_symbol_entity (scm, name);
if (v == QSE_NULL) return QSE_NULL;
/* We piggy-back the syntax code to a symbol name.
* The syntax entity is basically a symbol except that the
* code field of its label entity is set to non-zero.
* Read the comment in make_procedure_entity() for difference between
* the syntax entity and the procedure entity.
*/
TYPE(v) |= QSE_SCM_ENT_SYNT;
SYNT_CODE(v) = code;
return v;
}
static qse_scm_ent_t* make_procedure_entity (
qse_scm_t* scm, const qse_char_t* name, int code)
{
qse_scm_ent_t* sym, * proc, * pair;
/* A procedure entity is a built-in function that can be
* overridden by a user while a syntax entity represents a
* lower-level syntactic function that can't be overridden.
*
* (define lambda 10) is legal but does not change the
* meaning of lambda when used as a function name.
*
* (define tail 10) changes the meaning of eval totally.
* (tail '(1 2 3)) is not legal from now on.
*
* (define x lambda) is illegal as the lambda symbol
*
* (define lambda 10) followed by (define x lambda) lets the x symbol
* to be associated with 10 but you still can use lambda to create
* a closure as in ((lambda (x) (+ x 10)) 50)
*
* (define x tail) lets the 'x' symbol point to the eval procedure.
* (x '(1 2 3)) returns (2 3).
*
* We implement the syntax entity as a symbol itself by ORing
* the TYPE field with QSE_SCM_ENT_SYNT and setting the syntax
* code in the symbol label entity.
*
* A procedure entity is an independent entity unlike the syntax
* entity. We explicitly create a symbol entity for the procedure name
* and associate it with the procedure entity in the global environment.
* If you redefine the symbol name to be something else, you won't be
* able to reference the procedure entity with the name. Worst case,
* it may be GCed out.
*/
/* create a symbol containing the name */
sym = make_symbol_entity (scm, name);
if (sym == QSE_NULL) return QSE_NULL;
/* create an actual procedure value which is a number containing
* the opcode for the procedure */
proc = alloc_entity (scm, sym, QSE_NULL);
if (proc == QSE_NULL) return QSE_NULL;
TYPE(proc) = QSE_SCM_ENT_PROC;
ATOM(proc) = 1;
PROC_CODE(proc) = code;
/* create a pair containing the name symbol and the procedure value */
pair = make_pair_entity (scm, sym, proc);
if (pair == QSE_NULL) return QSE_NULL;
/* link it to the global environment */
pair = make_pair_entity (scm, pair, PAIR_CAR(scm->gloenv));
if (pair == QSE_NULL) return QSE_NULL;
PAIR_CAR(scm->gloenv) = pair;
return proc;
}
#define MAKE_SYNTAX_ENTITY(scm,name,code) QSE_BLOCK( \
if (make_syntax_entity (scm, name, code) == QSE_NULL) return -1; \
if (qse_scm_makesyntent (scm, name, code) == QSE_NULL) return -1; \
)
static int build_syntax_entities (qse_scm_t* scm)
{
qse_scm_ent_t* v;
v = make_syntax_entity (scm, QSE_T("lambda"), 1);
v = qse_scm_makesyntent (scm, QSE_T("lambda"), 1);
if (v == QSE_NULL) return -1;
scm->lambda = v;
v = make_syntax_entity (scm, QSE_T("quote"), 2);
v = qse_scm_makesyntent (scm, QSE_T("quote"), 2);
if (v == QSE_NULL) return -1;
scm->quote = v;
@ -726,8 +197,8 @@ static qse_scm_t* qse_scm_init (
scm->mem.ebl = QSE_NULL;
scm->mem.free = scm->nil;
/* initialize all the key data to nil before make_pair_entity()
* below. make_pair_entity() calls alloc_entity() that invokes
/* initialize all the key data to nil before qse_scm_makepairent()
* below. qse_scm_makepairent() calls alloc_entity() that invokes
* gc() as this is the first time. As gc() marks all the key data,
* we need to initialize these to nil. */
scm->reg.arg = scm->nil;
@ -741,7 +212,7 @@ static qse_scm_t* qse_scm_init (
scm->r.e = scm->nil;
/* build the global environment entity as a pair */
scm->gloenv = make_pair_entity (scm, scm->nil, scm->nil);
scm->gloenv = qse_scm_makepairent (scm, scm->nil, scm->nil);
if (scm->gloenv == QSE_NULL) goto oops;
/* update the current environment to the global environment */
@ -1259,7 +730,7 @@ static QSE_INLINE qse_scm_ent_t* push (qse_scm_t* scm, qse_scm_ent_t* obj)
{
qse_scm_ent_t* pair;
pair = make_pair_entity (scm, obj, scm->r.s);
pair = qse_scm_makepairent (scm, obj, scm->r.s);
if (pair == QSE_NULL) return QSE_NULL;
scm->r.s = pair;
@ -1271,7 +742,7 @@ static QSE_INLINE qse_scm_ent_t* push (qse_scm_t* scm, qse_scm_ent_t* obj)
static QSE_INLINE_ALWAYS void pop (qse_scm_t* scm)
{
QSE_ASSERTX (
!IS_NIL(scm->r.s),
!IS_NIL(scm,scm->r.s),
"You've called pop() more times than push()"
);
scm->r.s = PAIR_CDR(scm->r.s);
@ -1304,7 +775,7 @@ static QSE_INLINE qse_scm_ent_t* enter_list (qse_scm_t* scm, int flagv)
* nil#2 to store the last element in the list.
* both to be updated in chain_to_list() as items are added.
*/
return (push (scm, TO_SMALLINT(flagv)) == QSE_NULL ||
return (push (scm, TO_SMALLINT(scm,flagv)) == QSE_NULL ||
push (scm, scm->nil) == QSE_NULL ||
push (scm, scm->nil) == QSE_NULL)? QSE_NULL: scm->r.s;
}
@ -1315,7 +786,7 @@ static QSE_INLINE_ALWAYS qse_scm_ent_t* leave_list (qse_scm_t* scm, int* flagv)
/* the stack must not be empty */
QSE_ASSERTX (
!IS_NIL(scm->r.s),
!IS_NIL(scm,scm->r.s),
"You cannot leave a list without entering it"
);
@ -1327,7 +798,7 @@ static QSE_INLINE_ALWAYS qse_scm_ent_t* leave_list (qse_scm_t* scm, int* flagv)
pop (scm);
pop (scm);
if (IS_NIL(scm->r.s))
if (IS_NIL(scm,scm->r.s))
{
/* the stack is empty after popping.
* it is back to the top level.
@ -1351,12 +822,12 @@ static QSE_INLINE_ALWAYS void dot_list (qse_scm_t* scm)
qse_scm_ent_t* pair;
int flagv;
QSE_ASSERT (!IS_NIL(scm->r.s));
QSE_ASSERT (!IS_NIL(scm,scm->r.s));
/* mark the state that a dot has appeared in the list */
pair = PAIR_CDR(PAIR_CDR(scm->r.s));
flagv = FROM_SMALLINT(PAIR_CAR(pair));
PAIR_CAR(pair) = TO_SMALLINT(flagv | DOTTED);
flagv = FROM_SMALLINT(scm,PAIR_CAR(pair));
PAIR_CAR(pair) = TO_SMALLINT(scm,flagv|DOTTED);
}
static qse_scm_ent_t* chain_to_list (qse_scm_t* scm, qse_scm_ent_t* obj)
@ -1366,20 +837,20 @@ static qse_scm_ent_t* chain_to_list (qse_scm_t* scm, qse_scm_ent_t* obj)
/* the stack top is the pair pointing to the list tail */
tail = scm->r.s;
QSE_ASSERT (!IS_NIL(tail));
QSE_ASSERT (!IS_NIL(scm,tail));
/* the pair pointing to the list head is below the tail cell
* connected via cdr. */
head = PAIR_CDR(tail);
QSE_ASSERT (!IS_NIL(head));
QSE_ASSERT (!IS_NIL(scm,head));
/* the pair pointing to the flag is below the head cell
* connected via cdr */
flag = PAIR_CDR(head);
/* retrieve the numeric flag value */
QSE_ASSERT(IS_SMALLINT(PAIR_CAR(flag)));
flagv = (int)FROM_SMALLINT(PAIR_CAR(flag));
QSE_ASSERT(IS_SMALLINT(scm,PAIR_CAR(flag)));
flagv = (int)FROM_SMALLINT(scm,PAIR_CAR(flag));
if (flagv & CLOSED)
{
@ -1390,18 +861,18 @@ static qse_scm_ent_t* chain_to_list (qse_scm_t* scm, qse_scm_ent_t* obj)
else if (flagv & DOTTED)
{
/* the list must not be empty to have reached the dotted state */
QSE_ASSERT (!IS_NIL(PAIR_CAR(tail)));
QSE_ASSERT (!IS_NIL(scm,PAIR_CAR(tail)));
/* chain the object via 'cdr' of the tail cell */
PAIR_CDR(PAIR_CAR(tail)) = obj;
/* update the flag to CLOSED so that you can have more than
* one item after the dot. */
PAIR_CAR(flag) = TO_SMALLINT(flagv | CLOSED);
PAIR_CAR(flag) = TO_SMALLINT(scm,flagv|CLOSED);
}
else
{
cell = make_pair_entity (scm, obj, scm->nil);
cell = qse_scm_makepairent (scm, obj, scm->nil);
if (cell == QSE_NULL) return QSE_NULL;
if (PAIR_CAR(head) == scm->nil)
@ -1429,12 +900,12 @@ static QSE_INLINE_ALWAYS int is_list_empty (qse_scm_t* scm)
{
/* the stack must not be empty */
QSE_ASSERTX (
!IS_NIL(scm->r.s),
!IS_NIL(scm,scm->r.s),
"You can not call this function while the stack is empty"
);
/* if the tail pointer is pointing to nil, the list is empty */
return IS_NIL(PAIR_CAR(scm->r.s));
return IS_NIL(scm,PAIR_CAR(scm->r.s));
}
static int read_entity (qse_scm_t* scm)
@ -1563,20 +1034,20 @@ static int read_entity (qse_scm_t* scm)
break;
case TOK_INT:
obj = make_number_entity (scm, TOK_IVAL(scm));
obj = qse_scm_makenument (scm, TOK_IVAL(scm));
break;
case TOK_REAL:
obj = make_real_entity (scm, TOK_RVAL(scm));
obj = qse_scm_makerealent (scm, TOK_RVAL(scm));
break;
case TOK_STRING:
obj = make_string_entity (
obj = qse_scm_makestrent (
scm, TOK_NAME_PTR(scm), TOK_NAME_LEN(scm));
break;
case TOK_SYMBOL:
obj = make_symbol_entity (scm, TOK_NAME_PTR(scm));
obj = qse_scm_makesyment (scm, TOK_NAME_PTR(scm));
break;
}

8
qse/lib/scm/scm.h
View File

@ -208,6 +208,13 @@ struct qse_scm_t
} mem;
};
#define IS_NIL(scm,ent) QSE_SCM_ENT_ISNIL(scm,ent)
#define IS_SMALLINT(scm,ent) QSE_SCM_ENT_ISSMALLINT(scm,ent)
#define FROM_SMALLINT(scm,ent) QSE_SCM_ENT_FROMSMALLINT(scm,ent)
#define TO_SMALLINT(scm,num) QSE_SCM_ENT_TOSMALLINT(scm,num)
#define CAN_BE_SMALLINT(scm,num) QSE_SCM_ENT_CANBESMALLINT(scm,num)
#ifdef __cplusplus
extern "C" {
#endif
@ -218,4 +225,5 @@ const qse_char_t* qse_scm_dflerrstr (qse_scm_t* scm, qse_scm_errnum_t errnum);
#ifdef __cplusplus
}
#endif
#endif