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Language/OS - Multiplatform Resource Library
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LANGUAGE OS.iso
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pcl
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src-16f.lha
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ldb
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alloc.c
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C/C++ Source or Header
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1991-11-06
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3KB
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123 lines
/* $Header: alloc.c,v 1.7 91/10/22 18:36:50 wlott Exp $ */
#include "lisp.h"
#include "ldb.h"
#include "alloc.h"
#include "globals.h"
#ifdef ibmrt
#define GET_FREE_POINTER() ((lispobj *)SymbolValue(ALLOCATION_POINTER))
#define SET_FREE_POINTER(new_value) \
(SetSymbolValue(ALLOCATION_POINTER,(lispobj)(new_value)))
#define GET_GC_TRIGGER() ((lispobj *)SymbolValue(INTERNAL_GC_TRIGGER))
#define SET_GC_TRIGGER(new_value) \
(SetSymbolValue(INTERNAL_GC_TRIGGER,(lispobj)(new_value)))
#else
#define GET_FREE_POINTER() current_dynamic_space_free_pointer
#define SET_FREE_POINTER(new_value) \
(current_dynamic_space_free_pointer = (new_value))
#define GET_GC_TRIGGER() current_auto_gc_trigger
#define SET_GC_TRIGGER(new_value) \
clear_auto_gc_trigger(); set_auto_gc_trigger(new_value);
#endif
/****************************************************************
Allocation Routines.
****************************************************************/
static lispobj *alloc(bytes)
int bytes;
{
lispobj *result;
/* Round to dual word boundry. */
bytes = (bytes + lowtag_Mask) & ~lowtag_Mask;
result = GET_FREE_POINTER();
SET_FREE_POINTER(result + (bytes / sizeof(lispobj)));
if (GET_GC_TRIGGER() && GET_FREE_POINTER() > GET_GC_TRIGGER()) {
SET_GC_TRIGGER((char *)GET_FREE_POINTER()
- (char *)current_dynamic_space);
}
return result;
}
lispobj *alloc_unboxed(type, words)
int type, words;
{
lispobj *result;
result = alloc((1 + words) * sizeof(lispobj));
*result = (lispobj) (words << type_Bits) | type;
return result;
}
lispobj alloc_vector(type, length, size)
int type, length, size;
{
struct vector *result;
result = (struct vector *)alloc((2 + (length*size + 31) / 32) * sizeof(lispobj));
result->header = type;
result->length = fixnum(length);
return ((lispobj)result)|type_OtherPointer;
}
lispobj alloc_cons(car, cdr)
lispobj car, cdr;
{
struct cons *ptr = (struct cons *)alloc(sizeof(struct cons));
ptr->car = car;
ptr->cdr = cdr;
return (lispobj)ptr | type_ListPointer;
}
lispobj alloc_number(n)
long n;
{
struct bignum *ptr;
if (-0x20000000 < n && n < 0x20000000)
return fixnum(n);
else {
ptr = (struct bignum *)alloc_unboxed(type_Bignum, 1);
ptr->digits[0] = n;
return (lispobj) ptr | type_OtherPointer;
}
}
lispobj alloc_string(str)
char *str;
{
int len = strlen(str);
lispobj result = alloc_vector(type_SimpleString, len+1, 8);
struct vector *vec = (struct vector *)PTR(result);
vec->length = fixnum(len);
strcpy(vec->data, str);
return result;
}
lispobj alloc_sap(ptr)
char *ptr;
{
struct sap *sap = (struct sap *)alloc_unboxed(type_Sap, 1);
sap->pointer = ptr;
return (lispobj) sap | type_OtherPointer;
}