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slot-dispatch.dylan
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slot-dispatch.dylan
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language: infix-dylan
module: dispatch-engine-internal
Copyright: Original Code is Copyright (c) 1995-2004 Functional Objects, Inc.
All rights reserved.
License: See License.txt in this distribution for details.
Warranty: Distributed WITHOUT WARRANTY OF ANY KIND
define inline function slot-method-requiring-class-discrimination?
(m :: <method>, argnum :: <integer>)
if (case
argnum == 0 => instance?(m, <getter-accessor-method>);
argnum == 1 => instance?(m, <setter-accessor-method>);
otherwise => #f;
end case)
let m :: <accessor-method> = m;
let sd :: <slot-descriptor> = method-slot-descriptor(m); // who is missing type info?
let c :: <class> = slot-owner(sd);
~class-primary?(c)
else
#f
end if
end function;
define constant slotdiscrim$v-offset
= engine-node$v-data-start;
// define inline function builtin-slot-engine-node-offset
// (e :: <slot-access-engine-node>) => (offset :: <integer>);
// engine-node-raw-integer(e)
// end function;
define inline function set-slot-engine-node-offset
(e :: <slot-access-engine-node>, offset :: <integer>) => (offset :: <integer>);
let mask :: <integer> = ash(1, slotdiscrim$v-offset) - 1;
let props :: <integer> = properties(e);
properties(e) := logior(ash(offset, slotdiscrim$v-offset), logand(props, mask));
let callbacks :: <simple-object-vector> = *engine-node-callbacks*;
if (~(vector-element(callbacks, logand(ash(props, - properties$v-entry-type),
ash(1, properties$s-entry-type) - 1))))
engine-node-raw-integer(e) := offset
end if;
offset
end function;
define inline function callback-slot-engine-node-offset
(e :: <slot-access-engine-node>) => (offset :: <integer>);
ash(properties(e), - slotdiscrim$v-offset)
end function;
//define inline function slot-engine-node-size-offset
// (e :: <repeated-slot-access-engine-node>) => (offset :: <integer>);
// engine-node-data-1(e)
//end function;
//define inline function slot-engine-node-size-offset-setter
// (offset :: <integer>, e :: <repeated-slot-access-engine-node>) => (offset :: <integer>);
// engine-node-data-1(e) := offset
//end function;
// define engine-node-slot slot-engine-node-size-offset
// <repeated-slot-access-engine-node> <integer> engine-node-data-1;
// Basic instance slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function instance-slot-getter-engine-node
// (e :: <boxed-instance-slot-getter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// gf;
// let inst = vector-element(args, 0);
// let value = slot-element(inst, builtin-slot-engine-node-offset(e));
// if (unbound?(value))
// unbound-instance-slot(inst, builtin-slot-engine-node-offset(e))
// else
// value
// end if
//end function;
// Basic instance slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function instance-slot-setter-engine-node
// (e :: <boxed-instance-slot-setter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// gf;
// let inst = vector-element(args, 1);
// let value = vector-element(args, 0);
// slot-element(inst, builtin-slot-engine-node-offset(e)) := value
//end function;
// Basic instance slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function repeated-instance-slot-getter-engine-node
// (e :: <boxed-repeated-instance-slot-getter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let inst = vector-element(args, 0);
// let idx :: <integer> = vector-element(args, 1);
// let size-offset :: <integer> = slot-engine-node-size-offset(e);
// let siz :: <integer> = slot-element(inst, size-offset);
// if (idx < 0 | idx >= siz)
// repeated-slot-getter-index-out-of-range-trap(inst, idx);
// else
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// let value = /* repeated-slot-element(inst, offset, idx) */
// slot-element(inst, idx + offset);
// if (unbound?(value))
// unbound-repeated-slot(inst, idx)
// else
// value
// end if
// end if
//end function;
// Basic instance slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function repeated-instance-slot-setter-engine-node
// (e :: <boxed-repeated-instance-slot-setter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let value = vector-element(args, 0);
// let inst = vector-element(args, 1);
// let idx :: <integer> = vector-element(args, 2);
// let size-offset :: <integer> = slot-engine-node-size-offset(e);
// let siz :: <integer> = slot-element(inst, size-offset);
// if (idx < 0 | idx >= siz)
// repeated-slot-setter-index-out-of-range-trap(value, inst, idx)
// else
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// // repeated-slot-element(inst, offset, idx) := value
// slot-element(inst, idx + offset) := value
// end if
//end function;
// Basic byte slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function byte-slot-getter-engine-node
// (e :: <byte-slot-getter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let inst = vector-element(args, 0);
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// byte-slot-element(inst, offset, 0)
//end function;
// Basic byte slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function byte-slot-setter-engine-node
// (e :: <byte-slot-setter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let value = vector-element(args, 0);
// let inst = vector-element(args, 1);
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// byte-slot-element(inst, offset, 0) := value
//end function;
// Basic byte slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function repeated-byte-slot-getter-engine-node
// (e :: <repeated-byte-slot-getter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let inst = vector-element(args, 0);
// let idx :: <integer> = vector-element(args, 1);
// let size-offset :: <integer> = slot-engine-node-size-offset(e);
// let siz :: <integer> = slot-element(inst, size-offset);
// if (idx < 0 | idx >= siz)
// repeated-slot-getter-index-out-of-range-trap(inst, idx)
// else
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// byte-slot-element(inst, offset, idx)
// end if
//end function;
// Basic byte slots have built-in engine nodes, and don't need a callback.
// Here's the emulated engine node with obsolete argument order.
//define function repeated-byte-slot-setter-engine-node
// (e :: <repeated-byte-slot-setter-engine-node>,
// gf :: <generic-function>,
// args :: <simple-object-vector>)
// let value = vector-element(args, 0);
// let inst = vector-element(args, 1);
// let idx :: <integer> = vector-element(args, 2);
// let size-offset :: <integer> = slot-engine-node-size-offset(e);
// let siz :: <integer> = slot-element(inst, size-offset);
// if (idx < 0 | idx >= siz)
// repeated-slot-setter-index-out-of-range-trap(value, inst, idx)
// else
// let offset :: <integer> = builtin-slot-engine-node-offset(e);
// byte-slot-element(inst, offset, idx) := value
// end if
//end function;
// Class slots are currently implemented by callback.
define function %gf-dispatch-boxed-class-slot-getter
(inst, e :: <boxed-class-slot-getter-engine-node>, parent :: <dispatch-starter>)
let offset :: <integer> = callback-slot-engine-node-offset(e);
let cls :: <class> = object-class(inst);
let storage :: <simple-object-vector> = class-slot-storage(cls);
let e :: <pair> = vector-element(storage, offset);
let val = head(e);
if (unbound?(val))
unbound-class-slot(inst, offset)
else
val
end if
end function;
// Class slots are currently implemented by callback.
define function %gf-dispatch-boxed-class-slot-setter
(val, inst, e :: <boxed-class-slot-setter-engine-node>, parent :: <dispatch-starter>)
let offset :: <integer> = callback-slot-engine-node-offset(e);
let cls :: <class> = object-class(inst);
let storage :: <simple-object-vector> = class-slot-storage(cls);
let e :: <pair> = vector-element(storage, offset);
head(e) := val
end function;
define function slot-location (sd :: <slot-descriptor>,
icls :: <implementation-class>,
ds :: <dispatch-state>)
=> (index :: <integer>, location :: <integer>, success? :: <boolean>)
let off :: <integer> = slot-offset-i(sd, icls);
if (off)
values(off, off, #t)
else
// A little more sophistication might find this as being an obsolete instance
// error, or somesuch.
dispresult(make(<simple-error>,
format-string: "Can't find slot location for %= in %= - perhaps an "
"instance of a redefined class has been encountered.",
format-arguments: vector(sd, iclass-class(icls))),
ds);
values(0, 0, #f)
end if
end function;
define function make-slot-access-engine-node (meth :: <accessor-method>, ds :: <dispatch-state>)
=> (e :: <engine-node>)
let setter? = instance?(meth, <setter-accessor-method>);
let sd :: <slot-descriptor> = method-slot-descriptor(meth);
let thisargiclass :: <implementation-class>
= object-implementation-class(vector-element(%ds-args(ds), if (setter?) 1 else 0 end if));
let (index :: <integer>, location :: <integer>, success? :: <boolean>)
= slot-location(sd, thisargiclass, ds);
if (~success?)
$absent-engine-node
elseif (instance?(sd, <repeated-slot-descriptor>))
let sd :: <repeated-slot-descriptor> = sd;
let sizesd :: <slot-descriptor> = size-slot-descriptor(sd);
let (size-index :: <integer>, size-location :: <integer>)
= slot-location(sizesd, thisargiclass, ds);
get-repeated-slot-access-engine-node(select (sd by instance?)
<any-instance-slot-descriptor> =>
// @@@@ This is sick.
if (sd.slot-type == <byte-character>)
engine-node$k-raw-byte-repeated-instance-slot-getter
else
engine-node$k-boxed-repeated-instance-slot-getter
end if;
<any-class-slot-descriptor> =>
error("You must be joking");
end select,
setter?, index, location, size-index, size-location)
else
get-slot-access-engine-node(select (sd by instance?)
<any-instance-slot-descriptor> =>
engine-node$k-boxed-instance-slot-getter;
<any-class-slot-descriptor> =>
engine-node$k-boxed-class-slot-getter;
end select,
setter?, index, location)
end if
end function;
define primary class <slot-access-engine-repository> (<object>)
// slot engine-node-code :: false-or(<integer>), required-init-keyword: code:;
slot engine-node-table :: <simple-object-vector>, init-value: #[];
end class;
define inline sealed method make (c == <slot-access-engine-repository>, #key code)
=> (t :: <slot-access-engine-repository>);
c; make-slot-access-engine-repository(code)
end method;
define function make-slot-access-engine-repository (code)
let t :: <slot-access-engine-repository>
= system-allocate-simple-instance(<slot-access-engine-repository>);
// if (code)
// let code :: <integer> = code;
// engine-node-code(t) := code
// end;
engine-node-table(t) := #[];
t
end function;
define variable *slot-access-engine-repositories* :: <simple-object-vector>
= begin
let v :: <simple-object-vector>
= make(<simple-object-vector>, size: engine-node$k-slot-engine-node-count);
local method loop (i :: <integer>)
if (i < engine-node$k-slot-engine-node-count)
v[i] := make-slot-access-engine-repository(i + engine-node$k-first-slot-engine-node);
loop(i + 1)
end if
end method;
loop(0);
v
end;
define constant $slot-access-engine-repository-lock :: <simple-lock>
= make-simple-lock();
define macro with-slot-access-engine-repository-locked
{ with-slot-access-engine-repository-locked (?object:expression)
?body:body
end
}
=>
{ with-lock ($slot-access-engine-repository-lock)
?object ;
?body
end with-lock
}
end macro;
define function get-slot-access-engine-node
(code :: <integer>, setter?,
index :: <integer>, integer-data :: <integer>)
let code :: <integer> = if (setter?) code + 1 else code end;
let rep-offset :: <integer> = code - engine-node$k-first-slot-engine-node;
let reps :: <simple-object-vector> = *slot-access-engine-repositories*;
let repository :: <slot-access-engine-repository> = vector-element(reps, rep-offset);
get-from-repository(repository, index,
method ()
let e :: <slot-access-engine-node>
= bootstrap-allocate-engine-node(code, 0);
set-slot-engine-node-offset(e, integer-data);
primitive-initialize-engine-node(e);
e
end)
end function;
define function get-repeated-slot-access-engine-node
(code :: <integer>, setter?,
index :: <integer>, integer-data :: <integer>,
size-index :: <integer>, size-offset :: <integer>)
let code :: <integer> = if (setter?) code + 1 else code end;
let rep-offset :: <integer> = code - engine-node$k-first-slot-engine-node;
let reps :: <simple-object-vector> = *slot-access-engine-repositories*;
let repository :: <slot-access-engine-repository> = vector-element(reps, rep-offset);
let diff-index :: <integer> = index - size-index - 1;
// if (diff-index < 0) error("wtf?") end;
assert(diff-index >= 0,
"get-repeated-slot-access-engine-node: negative diff-index %= code %= index %= integer-data %= size-index %= size-offset %=",
diff-index, code, index, integer-data, size-index, size-offset);
let r2 :: <slot-access-engine-repository>
= get-from-repository(repository, index, method () make-slot-access-engine-repository(#f) end);
get-from-repository(r2, diff-index,
method ()
let e :: <repeated-slot-access-engine-node>
= bootstrap-allocate-engine-node(code, 0);
set-slot-engine-node-offset(e, integer-data);
slot-engine-node-size-offset(e) := size-offset;
primitive-initialize-engine-node(e);
e
end method)
end function;
define function get-from-repository
(repository :: <slot-access-engine-repository>, index :: <integer>, create-new-one :: <function>)
let table :: <simple-object-vector> = engine-node-table(repository);
let len :: <integer> = size(table);
((index < len & vector-element(table, index))
|
(with-slot-access-engine-repository-locked (repository)
let table :: <simple-object-vector>
= begin
let table :: <simple-object-vector> = engine-node-table(repository);
let len :: <integer> = size(table);
if (index < len)
table
else
let newtable :: <simple-object-vector>
= %make-simple-vector(logand(index + 15 + 1, -16), #f);
local method fill (i :: <integer>)
if (i == 0)
engine-node-table(repository) := newtable
else
let i :: <integer> = i - 1;
vector-element(newtable, i) := vector-element(table, i);
fill(i)
end if
end method;
fill(len)
end if
end;
(vector-element(table, index)
|
(vector-element(table, index) := create-new-one()))
end)
)
end function;
define function make-slot-accessing-next-method-chain (ds :: <dispatch-state>, m :: <accessor-method>)
let engine :: <engine-node> = make-slot-access-engine-node(m, ds);
engine ~== $absent-engine-node & pair(engine, %ds-gf(ds))
end function;