qse/ase/lsp/mem.c

723 lines
16 KiB
C

/*
* $Id: mem.c,v 1.7 2005-09-20 12:06:51 bacon Exp $
*/
#include <xp/lsp/mem.h>
#include <xp/lsp/prim.h>
#include <xp/bas/memory.h>
#include <xp/bas/string.h>
#include <xp/bas/assert.h>
xp_lsp_mem_t* xp_lsp_mem_new (xp_size_t ubound, xp_size_t ubound_inc)
{
xp_lsp_mem_t* mem;
xp_size_t i;
// allocate memory
mem = (xp_lsp_mem_t*)xp_malloc (xp_sizeof(xp_lsp_mem_t));
if (mem == XP_NULL) return XP_NULL;
// create a new root environment frame
mem->frame = xp_lsp_frame_new ();
if (mem->frame == XP_NULL) {
xp_free (mem);
return XP_NULL;
}
mem->root_frame = mem->frame;
mem->brooding_frame = XP_NULL;
// create an array to hold temporary objects
mem->temp_array = xp_lsp_array_new (512);
if (mem->temp_array == XP_NULL) {
xp_lsp_frame_free (mem->frame);
xp_free (mem);
return XP_NULL;
}
// initialize object allocation list
mem->ubound = ubound;
mem->ubound_inc = ubound_inc;
mem->count = 0;
for (i = 0; i < XP_LSP_TYPE_COUNT; i++) {
mem->used[i] = XP_NULL;
mem->free[i] = XP_NULL;
}
mem->locked = XP_NULL;
// when "ubound" is too small, the garbage collection can
// be performed while making the common objects.
mem->nil = XP_NULL;
mem->t = XP_NULL;
mem->quote = XP_NULL;
mem->lambda = XP_NULL;
mem->macro = XP_NULL;
// initialize common object pointers
mem->nil = xp_lsp_make_nil (mem);
mem->t = xp_lsp_make_true (mem);
mem->quote = xp_lsp_make_symbol (mem, XP_TEXT("quote"));
mem->lambda = xp_lsp_make_symbol (mem, XP_TEXT("lambda"));
mem->macro = xp_lsp_make_symbol (mem, XP_TEXT("macro"));
if (mem->nil == XP_NULL ||
mem->t == XP_NULL ||
mem->quote == XP_NULL ||
mem->lambda == XP_NULL ||
mem->macro == XP_NULL) {
xp_lsp_dispose_all (mem);
xp_lsp_array_free (mem->temp_array);
xp_lsp_frame_free (mem->frame);
xp_free (mem);
return XP_NULL;
}
return mem;
}
void xp_lsp_mem_free (xp_lsp_mem_t* mem)
{
xp_assert (mem != XP_NULL);
// dispose of the allocated objects
xp_lsp_dispose_all (mem);
// dispose of the temporary object arrays
xp_lsp_array_free (mem->temp_array);
// dispose of environment frames
xp_lsp_frame_free (mem->frame);
// free the memory
xp_free (mem);
}
static int __add_prim (xp_lsp_mem_t* mem,
const xp_char_t* name, xp_size_t len, xp_lsp_prim_t prim)
{
xp_lsp_obj_t* n, * p;
n = xp_lsp_make_symbolx (mem, name, len);
if (n == XP_NULL) return -1;
xp_lsp_lock (n);
p = xp_lsp_make_prim (mem, prim);
if (p == XP_NULL) return -1;
xp_lsp_unlock (n);
if (xp_lsp_set_func(mem, n, p) == XP_NULL) return -1;
return 0;
}
int xp_lsp_add_builtin_prims (xp_lsp_mem_t* mem)
{
#define ADD_PRIM(mem,name,len,prim) \
if (__add_prim(mem,name,len,prim) == -1) return -1;
ADD_PRIM (mem, XP_TEXT("abort"), 5, xp_lsp_prim_abort);
ADD_PRIM (mem, XP_TEXT("eval"), 4, xp_lsp_prim_eval);
ADD_PRIM (mem, XP_TEXT("prog1"), 5, xp_lsp_prim_prog1);
ADD_PRIM (mem, XP_TEXT("progn"), 5, xp_lsp_prim_progn);
ADD_PRIM (mem, XP_TEXT("gc"), 2, xp_lsp_prim_gc);
ADD_PRIM (mem, XP_TEXT("cond"), 4, xp_lsp_prim_cond);
ADD_PRIM (mem, XP_TEXT("if"), 2, xp_lsp_prim_if);
ADD_PRIM (mem, XP_TEXT("while"), 5, xp_lsp_prim_while);
ADD_PRIM (mem, XP_TEXT("car"), 3, xp_lsp_prim_car);
ADD_PRIM (mem, XP_TEXT("cdr"), 3, xp_lsp_prim_cdr);
ADD_PRIM (mem, XP_TEXT("cons"), 4, xp_lsp_prim_cons);
ADD_PRIM (mem, XP_TEXT("set"), 3, xp_lsp_prim_set);
ADD_PRIM (mem, XP_TEXT("setq"), 4, xp_lsp_prim_setq);
ADD_PRIM (mem, XP_TEXT("quote"), 5, xp_lsp_prim_quote);
ADD_PRIM (mem, XP_TEXT("defun"), 5, xp_lsp_prim_defun);
ADD_PRIM (mem, XP_TEXT("demac"), 5, xp_lsp_prim_demac);
ADD_PRIM (mem, XP_TEXT("let"), 3, xp_lsp_prim_let);
ADD_PRIM (mem, XP_TEXT("let*"), 4, xp_lsp_prim_letx);
ADD_PRIM (mem, XP_TEXT(">"), 1, xp_lsp_prim_gt);
ADD_PRIM (mem, XP_TEXT("<"), 1, xp_lsp_prim_lt);
ADD_PRIM (mem, XP_TEXT("+"), 1, xp_lsp_prim_plus);
ADD_PRIM (mem, XP_TEXT("-"), 1, xp_lsp_prim_minus);
return 0;
}
xp_lsp_obj_t* xp_lsp_alloc (xp_lsp_mem_t* mem, int type, xp_size_t size)
{
xp_lsp_obj_t* obj;
if (mem->count >= mem->ubound) xp_lsp_garbage_collect (mem);
if (mem->count >= mem->ubound) {
mem->ubound += mem->ubound_inc;
if (mem->count >= mem->ubound) return XP_NULL;
}
obj = (xp_lsp_obj_t*)xp_malloc (size);
if (obj == XP_NULL) {
xp_lsp_garbage_collect (mem);
obj = (xp_lsp_obj_t*)xp_malloc (size);
if (obj == XP_NULL) return XP_NULL;
}
XP_LSP_TYPE(obj) = type;
XP_LSP_SIZE(obj) = size;
XP_LSP_MARK(obj) = 0;
XP_LSP_LOCK(obj) = 0;
// insert the object at the head of the used list
XP_LSP_LINK(obj) = mem->used[type];
mem->used[type] = obj;
mem->count++;
#if 0
xp_dprint1 (XP_TEXT("mem->count: %u\n"), mem->count);
#endif
return obj;
}
void xp_lsp_dispose (xp_lsp_mem_t* mem, xp_lsp_obj_t* prev, xp_lsp_obj_t* obj)
{
xp_assert (mem != XP_NULL);
xp_assert (obj != XP_NULL);
xp_assert (mem->count > 0);
// TODO: push the object to the free list for more
// efficient memory management
if (prev == XP_NULL)
mem->used[XP_LSP_TYPE(obj)] = XP_LSP_LINK(obj);
else XP_LSP_LINK(prev) = XP_LSP_LINK(obj);
mem->count--;
#if 0
xp_dprint1 (XP_TEXT("mem->count: %u\n"), mem->count);
#endif
xp_free (obj);
}
void xp_lsp_dispose_all (xp_lsp_mem_t* mem)
{
xp_lsp_obj_t* obj, * next;
xp_size_t i;
for (i = 0; i < XP_LSP_TYPE_COUNT; i++) {
obj = mem->used[i];
while (obj != XP_NULL) {
next = XP_LSP_LINK(obj);
xp_lsp_dispose (mem, XP_NULL, obj);
obj = next;
}
}
}
static void xp_lsp_mark_obj (xp_lsp_obj_t* obj)
{
xp_assert (obj != XP_NULL);
// TODO:....
// can it be recursive?
if (XP_LSP_MARK(obj) != 0) return;
XP_LSP_MARK(obj) = 1;
if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_CONS) {
xp_lsp_mark_obj (XP_LSP_CAR(obj));
xp_lsp_mark_obj (XP_LSP_CDR(obj));
}
else if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_FUNC) {
xp_lsp_mark_obj (XP_LSP_FFORMAL(obj));
xp_lsp_mark_obj (XP_LSP_FBODY(obj));
}
else if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_MACRO) {
xp_lsp_mark_obj (XP_LSP_MFORMAL(obj));
xp_lsp_mark_obj (XP_LSP_MBODY(obj));
}
}
/*
* xp_lsp_lock and xp_lsp_unlock_all are just called by xp_lsp_read.
*/
void xp_lsp_lock (xp_lsp_obj_t* obj)
{
xp_assert (obj != XP_NULL);
XP_LSP_LOCK(obj) = 1;
//XP_LSP_MARK(obj) = 1;
}
void xp_lsp_unlock (xp_lsp_obj_t* obj)
{
xp_assert (obj != XP_NULL);
XP_LSP_LOCK(obj) = 0;
}
void xp_lsp_unlock_all (xp_lsp_obj_t* obj)
{
xp_assert (obj != XP_NULL);
XP_LSP_LOCK(obj) = 0;
if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_CONS) {
xp_lsp_unlock_all (XP_LSP_CAR(obj));
xp_lsp_unlock_all (XP_LSP_CDR(obj));
}
else if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_FUNC) {
xp_lsp_unlock_all (XP_LSP_FFORMAL(obj));
xp_lsp_unlock_all (XP_LSP_FBODY(obj));
}
else if (XP_LSP_TYPE(obj) == XP_LSP_OBJ_MACRO) {
xp_lsp_unlock_all (XP_LSP_MFORMAL(obj));
xp_lsp_unlock_all (XP_LSP_MBODY(obj));
}
}
static void xp_lsp_mark (xp_lsp_mem_t* mem)
{
xp_lsp_frame_t* frame;
xp_lsp_assoc_t* assoc;
xp_lsp_array_t* array;
xp_size_t i;
#if 0
xp_dprint0 (XP_TEXT("marking environment frames\n"));
#endif
// mark objects in the environment frames
frame = mem->frame;
while (frame != XP_NULL) {
assoc = frame->assoc;
while (assoc != XP_NULL) {
xp_lsp_mark_obj (assoc->name);
if (assoc->value != XP_NULL)
xp_lsp_mark_obj (assoc->value);
if (assoc->func != XP_NULL)
xp_lsp_mark_obj (assoc->func);
assoc = assoc->link;
}
frame = frame->link;
}
#if 0
xp_dprint0 (XP_TEXT("marking interim frames\n"));
#endif
// mark objects in the interim frames
frame = mem->brooding_frame;
while (frame != XP_NULL) {
assoc = frame->assoc;
while (assoc != XP_NULL) {
xp_lsp_mark_obj (assoc->name);
if (assoc->value != XP_NULL)
xp_lsp_mark_obj (assoc->value);
if (assoc->func != XP_NULL)
xp_lsp_mark_obj (assoc->func);
assoc = assoc->link;
}
frame = frame->link;
}
/*
xp_dprint0 (XP_TEXT("marking the locked object\n"));
if (mem->locked != XP_NULL) xp_lsp_mark_obj (mem->locked);
*/
#if 0
xp_dprint0 (XP_TEXT("marking termporary objects\n"));
#endif
array = mem->temp_array;
for (i = 0; i < array->size; i++) {
xp_lsp_mark_obj (array->buffer[i]);
}
#if 0
xp_dprint0 (XP_TEXT("marking builtin objects\n"));
#endif
// mark common objects
if (mem->t != XP_NULL) xp_lsp_mark_obj (mem->t);
if (mem->nil != XP_NULL) xp_lsp_mark_obj (mem->nil);
if (mem->quote != XP_NULL) xp_lsp_mark_obj (mem->quote);
if (mem->lambda != XP_NULL) xp_lsp_mark_obj (mem->lambda);
if (mem->macro != XP_NULL) xp_lsp_mark_obj (mem->macro);
}
static void xp_lsp_sweep (xp_lsp_mem_t* mem)
{
xp_lsp_obj_t* obj, * prev, * next;
xp_size_t i;
// scan all the allocated objects and get rid of unused objects
for (i = 0; i < XP_LSP_TYPE_COUNT; i++) {
//for (i = XP_LSP_TYPE_COUNT; i > 0; /*i--*/) {
prev = XP_NULL;
obj = mem->used[i];
//obj = mem->used[--i];
#if 0
xp_dprint1 (XP_TEXT("sweeping objects of type: %u\n"), i);
#endif
while (obj != XP_NULL) {
next = XP_LSP_LINK(obj);
if (XP_LSP_LOCK(obj) == 0 && XP_LSP_MARK(obj) == 0) {
// dispose of unused objects
xp_lsp_dispose (mem, prev, obj);
}
else {
// unmark the object in use
XP_LSP_MARK(obj) = 0;
prev = obj;
}
obj = next;
}
}
}
void xp_lsp_garbage_collect (xp_lsp_mem_t* mem)
{
xp_lsp_mark (mem);
xp_lsp_sweep (mem);
}
xp_lsp_obj_t* xp_lsp_make_nil (xp_lsp_mem_t* mem)
{
if (mem->nil != XP_NULL) return mem->nil;
mem->nil = xp_lsp_alloc (mem, XP_LSP_OBJ_NIL, xp_sizeof(xp_lsp_obj_nil_t));
return mem->nil;
}
xp_lsp_obj_t* xp_lsp_make_true (xp_lsp_mem_t* mem)
{
if (mem->t != XP_NULL) return mem->t;
mem->t = xp_lsp_alloc (mem, XP_LSP_OBJ_TRUE, xp_sizeof(xp_lsp_obj_true_t));
return mem->t;
}
xp_lsp_obj_t* xp_lsp_make_int (xp_lsp_mem_t* mem, xp_lsp_int_t value)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem,
XP_LSP_OBJ_INT, xp_sizeof(xp_lsp_obj_int_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_IVALUE(obj) = value;
return obj;
}
xp_lsp_obj_t* xp_lsp_make_real (xp_lsp_mem_t* mem, xp_lsp_real_t value)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem,
XP_LSP_OBJ_REAL, xp_sizeof(xp_lsp_obj_real_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_RVALUE(obj) = value;
return obj;
}
xp_lsp_obj_t* xp_lsp_make_symbol (xp_lsp_mem_t* mem, const xp_char_t* str)
{
return xp_lsp_make_symbolx (mem, str, xp_strlen(str));
}
xp_lsp_obj_t* xp_lsp_make_symbolx (
xp_lsp_mem_t* mem, const xp_char_t* str, xp_size_t len)
{
xp_lsp_obj_t* obj;
// look for a sysmbol with the given name
obj = mem->used[XP_LSP_OBJ_SYMBOL];
while (obj != XP_NULL) {
// if there is a symbol with the same name, it is just used.
if (xp_lsp_comp_symbol2 (obj, str, len) == 0) return obj;
obj = XP_LSP_LINK(obj);
}
// no such symbol found. create a new one
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_SYMBOL,
xp_sizeof(xp_lsp_obj_symbol_t) + (len + 1) * xp_sizeof(xp_char_t));
if (obj == XP_NULL) return XP_NULL;
// fill in the symbol buffer
xp_lsp_copy_string2 (XP_LSP_SYMVALUE(obj), str, len);
return obj;
}
xp_lsp_obj_t* xp_lsp_make_string (xp_lsp_mem_t* mem, const xp_char_t* str)
{
return xp_lsp_make_stringx (mem, str, xp_strlen(str));
}
xp_lsp_obj_t* xp_lsp_make_stringx (
xp_lsp_mem_t* mem, const xp_char_t* str, xp_size_t len)
{
xp_lsp_obj_t* obj;
// allocate memory for the string
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_STRING,
xp_sizeof(xp_lsp_obj_string_t) + (len + 1) * xp_sizeof(xp_char_t));
if (obj == XP_NULL) return XP_NULL;
// fill in the string buffer
xp_lsp_copy_string2 (XP_LSP_STRVALUE(obj), str, len);
return obj;
}
xp_lsp_obj_t* xp_lsp_make_cons (
xp_lsp_mem_t* mem, xp_lsp_obj_t* car, xp_lsp_obj_t* cdr)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_CONS, xp_sizeof(xp_lsp_obj_cons_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_CAR(obj) = car;
XP_LSP_CDR(obj) = cdr;
return obj;
}
xp_lsp_obj_t* xp_lsp_make_func (
xp_lsp_mem_t* mem, xp_lsp_obj_t* formal, xp_lsp_obj_t* body)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_FUNC, xp_sizeof(xp_lsp_obj_func_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_FFORMAL(obj) = formal;
XP_LSP_FBODY(obj) = body;
return obj;
}
xp_lsp_obj_t* xp_lsp_make_macro (
xp_lsp_mem_t* mem, xp_lsp_obj_t* formal, xp_lsp_obj_t* body)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_MACRO, xp_sizeof(xp_lsp_obj_macro_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_MFORMAL(obj) = formal;
XP_LSP_MBODY(obj) = body;
return obj;
}
xp_lsp_obj_t* xp_lsp_make_prim (xp_lsp_mem_t* mem, void* impl)
{
xp_lsp_obj_t* obj;
obj = xp_lsp_alloc (mem, XP_LSP_OBJ_PRIM, xp_sizeof(xp_lsp_obj_prim_t));
if (obj == XP_NULL) return XP_NULL;
XP_LSP_PRIM(obj) = impl;
return obj;
}
xp_lsp_assoc_t* xp_lsp_lookup (xp_lsp_mem_t* mem, xp_lsp_obj_t* name)
{
xp_lsp_frame_t* frame;
xp_lsp_assoc_t* assoc;
xp_assert (XP_LSP_TYPE(name) == XP_LSP_OBJ_SYMBOL);
frame = mem->frame;
while (frame != XP_NULL) {
assoc = xp_lsp_frame_lookup (frame, name);
if (assoc != XP_NULL) return assoc;
frame = frame->link;
}
return XP_NULL;
}
xp_lsp_assoc_t* xp_lsp_set_value (
xp_lsp_mem_t* mem, xp_lsp_obj_t* name, xp_lsp_obj_t* value)
{
xp_lsp_assoc_t* assoc;
assoc = xp_lsp_lookup (mem, name);
if (assoc == XP_NULL) {
assoc = xp_lsp_frame_insert_value (
mem->root_frame, name, value);
if (assoc == XP_NULL) return XP_NULL;
}
else assoc->value = value;
return assoc;
}
xp_lsp_assoc_t* xp_lsp_set_func (
xp_lsp_mem_t* mem, xp_lsp_obj_t* name, xp_lsp_obj_t* func)
{
xp_lsp_assoc_t* assoc;
assoc = xp_lsp_lookup (mem, name);
if (assoc == XP_NULL) {
assoc = xp_lsp_frame_insert_func (mem->root_frame, name, func);
if (assoc == XP_NULL) return XP_NULL;
}
else assoc->func = func;
return assoc;
}
xp_size_t xp_lsp_cons_len (xp_lsp_mem_t* mem, xp_lsp_obj_t* obj)
{
xp_size_t count;
xp_assert (obj == mem->nil || XP_LSP_TYPE(obj) == XP_LSP_OBJ_CONS);
count = 0;
//while (obj != mem->nil) {
while (XP_LSP_TYPE(obj) == XP_LSP_OBJ_CONS) {
count++;
obj = XP_LSP_CDR(obj);
}
return count;
}
int xp_lsp_probe_args (xp_lsp_mem_t* mem, xp_lsp_obj_t* obj, xp_size_t* len)
{
xp_size_t count = 0;
while (XP_LSP_TYPE(obj) == XP_LSP_OBJ_CONS) {
count++;
obj = XP_LSP_CDR(obj);
}
if (obj != mem->nil) return -1;
*len = count;
return 0;
}
int xp_lsp_comp_symbol (xp_lsp_obj_t* obj, const xp_char_t* str)
{
xp_char_t* p;
xp_size_t index, length;
xp_assert (XP_LSP_TYPE(obj) == XP_LSP_OBJ_SYMBOL);
index = 0;
length = XP_LSP_SYMLEN(obj);
p = XP_LSP_SYMVALUE(obj);
while (index < length) {
if (*p > *str) return 1;
if (*p < *str) return -1;
index++; p++; str++;
}
return (*str == XP_CHAR('\0'))? 0: -1;
}
int xp_lsp_comp_symbol2 (xp_lsp_obj_t* obj, const xp_char_t* str, xp_size_t len)
{
xp_char_t* p;
xp_size_t index, length;
xp_assert (XP_LSP_TYPE(obj) == XP_LSP_OBJ_SYMBOL);
index = 0;
length = XP_LSP_SYMLEN(obj);
p = XP_LSP_SYMVALUE(obj);
while (index < length && index < len) {
if (*p > *str) return 1;
if (*p < *str) return -1;
index++; p++; str++;
}
return (length < len)? -1:
(length > len)? 1: 0;
}
int xp_lsp_comp_string (xp_lsp_obj_t* obj, const xp_char_t* str)
{
xp_char_t* p;
xp_size_t index, length;
xp_assert (XP_LSP_TYPE(obj) == XP_LSP_OBJ_STRING);
index = 0;
length = XP_LSP_STRLEN(obj);
p = XP_LSP_STRVALUE(obj);
while (index < length) {
if (*p > *str) return 1;
if (*p < *str) return -1;
index++; p++; str++;
}
return (*str == XP_CHAR('\0'))? 0: -1;
}
int xp_lsp_comp_string2 (xp_lsp_obj_t* obj, const xp_char_t* str, xp_size_t len)
{
xp_char_t* p;
xp_size_t index, length;
xp_assert (XP_LSP_TYPE(obj) == XP_LSP_OBJ_STRING);
index = 0;
length = XP_LSP_STRLEN(obj);
p = XP_LSP_STRVALUE(obj);
while (index < length && index < len) {
if (*p > *str) return 1;
if (*p < *str) return -1;
index++; p++; str++;
}
return (length < len)? -1:
(length > len)? 1: 0;
}
void xp_lsp_copy_string (xp_char_t* dst, const xp_char_t* str)
{
// the buffer pointed by dst should be big enough to hold str
while (*str != XP_CHAR('\0')) *dst++ = *str++;
*dst = XP_CHAR('\0');
}
void xp_lsp_copy_string2 (xp_char_t* dst, const xp_char_t* str, xp_size_t len)
{
// the buffer pointed by dst should be big enough to hold str
while (len > 0) {
*dst++ = *str++;
len--;
}
*dst = XP_CHAR('\0');
}