253 lines
8.4 KiB
C
253 lines
8.4 KiB
C
/*
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* $Id$
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*
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Copyright (c) 2014-2015 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STIX_PRV_H_
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#define _STIX_PRV_H_
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#include "stix.h"
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/* this is useful for debugging. stix_gc() can be called
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* while stix has not been fully initialized when this is defined*/
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#define STIX_SUPPORT_GC_DURING_IGNITION
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#define STIX_DEBUG_GC_1
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#include <stdio.h> /* TODO: delete these header inclusion lines */
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#include <string.h>
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#include <assert.h>
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#define STIX_MEMSET(dst,src,size) memset(dst,src,size)
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#define STIX_MEMCPY(dst,src,size) memcpy(dst,src,size)
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#define STIX_ASSERT(x) assert(x)
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#define STIX_ALIGN(x,y) ((((x) + (y) - 1) / (y)) * (y))
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/* ========================================================================= */
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/* CLASS SPEC ENCODING */
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/* ========================================================================= */
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/*
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* The spec field of a class object encodes the number of the fixed part
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* and the type of the indexed part. The fixed part is the number of
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* named instance variables. If the spec of a class is indexed, the object
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* of the class can be i nstantiated with the size of the indexed part.
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*
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* For example, on a platform where sizeof(stix_oow_t) is 4,
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* the layout of the spec field of a class as an OOP value looks like this:
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*
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* 31 10 9 8 7 6 5 4 3 2 1 0
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* |number of named instance variables|indexed-type|indexability|oop-tag|
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*
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* the number of named instance variables is stored in high 23 bits.
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* the indexed type takes up bit 3 to bit 8. And the indexability is
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* stored in bit 2.
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*
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* The maximum number of named(fixed) instance variables for a class is:
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* 2 ^ ((BITS-IN-OOW - STIX_OOP_TAG_BITS) - STIX_OBJ_TYPE_BITS - 1) - 1
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*
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* STIX_OOP_TAG_BITS are decremented from the number of bits in OOW because
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* the spec field is always encoded as a small integer.
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*
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* The number of named instance variables can be greater than 0 if the
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* class spec is not indexed or if it's a pointer indexed class
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* (indexed_type == STIX_OBJ_TYPE_OOP)
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*
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* indexed_type is one of the #stix_obj_type_t enumerators.
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*/
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/*
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* The STIX_CLASS_SPEC_MAKE() macro creates a class spec value.
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* _class->spec = STIX_OOP_FROM_SMINT(STIX_CLASS_SPEC_MAKE(0, 1, STIX_OBJ_TYPE_CHAR));
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*/
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#define STIX_CLASS_SPEC_MAKE(named_instvar,is_indexed,indexed_type) ( \
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(((stix_oow_t)(named_instvar)) << (STIX_OBJ_FLAGS_TYPE_BITS + 1)) | \
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(((stix_oow_t)(indexed_type)) << 1) | (((stix_oow_t)is_indexed) & 1) )
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/* what is the number of named instance variables?
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* STIX_CLASS_SPEC_NAMED_INSTVAR(STIX_OOP_TO_SMINT(_class->spec))
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*/
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#define STIX_CLASS_SPEC_NAMED_INSTVAR(spec) \
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(((stix_oow_t)(spec)) >> (STIX_OBJ_FLAGS_TYPE_BITS + 1))
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/* is it a user-indexable class?
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* all objects can be indexed with basicAt:.
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* this indicates if an object can be instantiated with a dynamic size
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* (new: size) and and can be indexed with at:.
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*/
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#define STIX_CLASS_SPEC_IS_INDEXED(spec) (((stix_oow_t)(spec)) & 1)
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/* if so, what is the indexing type? character? pointer? etc? */
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#define STIX_CLASS_SPEC_INDEXED_TYPE(spec) \
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((((stix_oow_t)(spec)) >> 1) & STIX_LBMASK(stix_oow_t, STIX_OBJ_FLAGS_TYPE_BITS))
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/* What is the maximum number of named instance variables?
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* 2 ^ ((BITS-IN-OOW - STIX_OOP_TAG_BITS) - STIX_OBJ_TYPE_BITS - 1) - 1
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* This limit is set because the number must be encoded into the spec field
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* of the class with limited number of bits assigned to the number of
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* named instance variables.
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*/
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#define STIX_MAX_NAMED_INSTVARS \
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STIX_BITS_MAX(stix_oow_t, STIX_OOW_BITS - STIX_OOP_TAG_BITS - (STIX_OBJ_FLAGS_TYPE_BITS + 1))
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/* Given the number of named instance variables, what is the maximum number
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* of indexed instance variables? The number of indexed instance variables
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* is not stored in the spec field of the class. It only affects the actual
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* size of an object(obj->_size) selectively combined with the number of
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* named instance variables. So it's the maximum value of obj->_size minus
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* the number of named instance variables.
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*/
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#define STIX_MAX_INDEXED_INSTVARS(named_instvar) ((~(stix_oow_t)0) - named_instvar)
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* ========================================================================= */
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/* heap.c */
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/* ========================================================================= */
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/**
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* The stix_makeheap() function creates a new heap of the \a size bytes.
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*
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* \return heap pointer on success and #STIX_NULL on failure.
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*/
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stix_heap_t* stix_makeheap (
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stix_t* stix,
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stix_size_t size
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);
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/**
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* The stix_killheap() function destroys the heap pointed to by \a heap.
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*/
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void stix_killheap (
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stix_t* stix,
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stix_heap_t* heap
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);
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/**
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* The stix_allocheapmem() function allocates \a size bytes in the heap pointed
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* to by \a heap.
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*
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* \return memory pointer on success and #STIX_NULL on failure.
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*/
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void* stix_allocheapmem (
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stix_t* stix,
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stix_heap_t* heap,
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stix_size_t size
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);
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/* ========================================================================= */
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/* stix.c */
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/* ========================================================================= */
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stix_oow_t stix_hashbytes (
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const stix_uint8_t* ptr,
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stix_oow_t len
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);
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stix_oow_t stix_hashchars (
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const stix_char_t* ptr,
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stix_oow_t len
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);
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int stix_equalchars (
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const stix_char_t* str1,
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const stix_char_t* str2,
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stix_oow_t len
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);
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/* ========================================================================= */
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/* obj.c */
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/* ========================================================================= */
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void* stix_allocbytes (
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stix_t* stix,
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stix_size_t size
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);
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/**
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* The stix_allocoopobj() function allocates a raw object composed of \a size
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* pointer fields excluding the header.
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*/
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stix_oop_t stix_allocoopobj (
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stix_t* stix,
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stix_oow_t size
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);
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stix_oop_t stix_alloccharobj (
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stix_t* stix,
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const stix_char_t* ptr,
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stix_oow_t len
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);
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stix_oop_t stix_allocuint8obj (
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stix_t* stix,
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const stix_uint8_t* ptr,
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stix_oow_t len
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);
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stix_oop_t stix_allocuint16obj (
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stix_t* stix,
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const stix_uint16_t* ptr,
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stix_oow_t len
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);
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/* ========================================================================= */
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/* sym.c */
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/* ========================================================================= */
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stix_oop_t stix_makesymbol (
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stix_t* stix,
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const stix_char_t* ptr,
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stix_oow_t len
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);
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stix_oop_t stix_findsymbol (
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stix_t* stix,
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const stix_char_t* ptr,
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stix_oow_t len
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);
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/* ========================================================================= */
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/* dic.c */
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/* ========================================================================= */
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stix_oop_t stix_putatsysdic (
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stix_t* stix,
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stix_oop_t key,
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stix_oop_t value
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);
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stix_oop_t stix_getatsysdic (
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stix_t* stix,
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stix_oop_t key
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);
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#if defined(__cplusplus)
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}
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#endif
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#endif
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