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/*-----------------------------------------------------------------*-C-*---
* File: handc/runtime/readwrit.ci
*
* Copyright (C)1997 Donovan Kolbly <d.kolbly@rscheme.org>
* as part of the RScheme project, licensed for free use.
* See <http://www.rscheme.org/> for the latest information.
*
* File version: 1.9
* File mod date: 1997.11.29 23:10:53
* System build: v0.7.2, 97.12.21
*
*------------------------------------------------------------------------*/
#include <rscheme/gcserver.h>
/******************** Memory Read Functions ********************/
#ifdef DEBUG_SMEMORY
CI_DECL obj gvec_read( obj gvec, UINT_32 byte_offset )
{
obj item;
#ifdef VALIDATE_BLOCKS
validate_block( PTR_TO_GCPTR(gvec) );
#endif
assert( (byte_offset & 3) == 0 );
assert( byte_offset < SIZEOF_PTR(gvec) );
item = *(obj *)(((char *)PTR_TO_DATAPTR(gvec)) + byte_offset);
/* if there is a read barrier, we need to apply it to the
* extracted value, since it may be the first time this value
* gets into the root set
*/
return READ_BARRIER(item);
}
#endif
CI_DECL UINT_8 bvec_read_uint8( obj bvec, UINT_32 byte_offset )
{
#ifdef VALIDATE_BLOCKS
validate_block( PTR_TO_GCPTR(bvec) );
#endif
assert( byte_offset < SIZEOF_PTR(bvec) );
return ((UINT_8 *)PTR_TO_DATAPTR(bvec))[byte_offset];
}
/******************** Memory Write Functions ********************/
CI_DECL void gvec_write( obj gvec, UINT_32 byte_offset, obj value )
{
obj *dest = (obj *)(((char *)PTR_TO_DATAPTR(gvec)) + byte_offset);
assert( !EQ(*dest,DEBUG_TRAP_OBJ) );
if (OBJ_ISA_PTR(value))
{
write_barrier( PTR_TO_GCPTR(gvec), dest, PTR_TO_GCPTR(value) );
}
else
{
write_barrier_lval_clobber( PTR_TO_GCPTR(gvec), dest );
}
assert( (byte_offset & 3) == 0 );
assert( byte_offset < SIZEOF_PTR(gvec) );
*dest = value;
}
CI_DECL void gvec_write_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
assert( OBJ_ISA_PTR(value) );
gvec_write( gvec, byte_offset, value );
}
CI_DECL void gvec_write_non_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
obj *dest = (obj *)(((char *)PTR_TO_DATAPTR(gvec)) + byte_offset);
assert( !OBJ_ISA_PTR(value) );
assert( (byte_offset & 3) == 0 );
assert( byte_offset < SIZEOF_PTR(gvec) );
write_barrier_lval_clobber( PTR_TO_GCPTR(gvec), dest );
*dest = value;
}
/* an object is FRESH from the time it is allocated to
the next GC_SAFE_POINT. This is extraordinarily useful
if you are allocating white, in which case the write
barrier becomes a NOP
*/
CI_DECL void gvec_write_fresh( obj gvec, UINT_32 byte_offset, obj value )
{
obj *dest = (obj *)(((char *)PTR_TO_DATAPTR(gvec)) + byte_offset);
assert( !EQ(*dest,DEBUG_TRAP_OBJ) );
if (OBJ_ISA_PTR(value))
{
write_barrier_lval_fresh( PTR_TO_GCPTR(gvec),
dest,
PTR_TO_GCPTR(value) );
}
assert( (byte_offset & 3) == 0 );
assert( byte_offset < SIZEOF_PTR(gvec) );
*dest = value;
}
/* an initializing write is the first write to that slot
of the target object.
!!! The gvec is necessarily FRESH, because a gvec MUST
!!! be fully initialized before the next gc safe point
*/
CI_DECL void gvec_write_init( obj gvec, UINT_32 byte_offset, obj value )
{
obj *dest = (obj *)(((char *)PTR_TO_DATAPTR(gvec)) + byte_offset);
assert( EQ(*dest,DEBUG_TRAP_OBJ) );
if (OBJ_ISA_PTR(value))
{
write_barrier_lval_init(PTR_TO_GCPTR(gvec),dest,PTR_TO_GCPTR(value));
}
assert( (byte_offset & 3) == 0 );
assert( byte_offset < SIZEOF_PTR(gvec) );
*dest = value;
}
CI_DECL void gvec_write_fresh_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
assert( OBJ_ISA_PTR(value) );
gvec_write_fresh( gvec, byte_offset, value );
}
CI_DECL void gvec_write_fresh_non_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
assert( !OBJ_ISA_PTR(value) );
gvec_write_fresh( gvec, byte_offset, value );
}
CI_DECL void gvec_write_init_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
assert( OBJ_ISA_PTR(value) );
gvec_write_init( gvec, byte_offset, value );
}
CI_DECL void gvec_write_init_non_ptr( obj gvec, UINT_32 byte_offset, obj value )
{
assert( !OBJ_ISA_PTR(value) );
gvec_write_init( gvec, byte_offset, value );
}
/* Allocate a gvec filled with FALSE_OBJ's */
CI_DECL obj gvec_alloc( UINT_32 len, obj obj_class )
{
UINT_32 i;
obj thing;
thing = alloc( sizeof(obj) * len, obj_class );
for (i=0; i<len; i++)
gvec_write_init_non_ptr( thing, SLOT(i), FALSE_OBJ );
return thing;
}
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