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49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/* weak.c -- weak pointers and ephemerons */
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/* Copyright (c) 2010 Alex Shinn. All rights reserved. */
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/* BSD-style license: http://synthcode.com/license.txt */
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#include <chibi/eval.h>
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static int sexp_ephemeron_id;
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#define sexp_ephemeron_key(x) sexp_slot_ref(x, 0)
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#define sexp_ephemeron_value(x) sexp_slot_ref(x, 1)
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sexp sexp_make_ephemeron (sexp ctx sexp_api_params(self, n), sexp key, sexp value) {
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sexp res = sexp_alloc_type(ctx, pair, sexp_ephemeron_id);
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if (! sexp_exceptionp(res)) {
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sexp_ephemeron_key(res) = key;
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sexp_ephemeron_value(res) = value;
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}
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return res;
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}
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sexp sexp_ephemeron_brokenp_op (sexp ctx sexp_api_params(self, n), sexp eph) {
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return sexp_make_boolean(sexp_brokenp(eph));
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}
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sexp sexp_init_library (sexp ctx sexp_api_params(self, n), sexp env) {
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sexp_gc_var3(name, t, op);
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sexp_gc_preserve3(ctx, name, t, op);
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name = sexp_c_string(ctx, "Ephemeron", -1);
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t = sexp_register_simple_type(ctx, name, SEXP_FALSE, SEXP_TWO);
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sexp_ephemeron_id = sexp_type_tag(t);
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sexp_type_field_len_base(t) = 0;
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sexp_type_weak_base(t) = sexp_type_field_base(t);
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sexp_type_weak_len_base(t) = 1;
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sexp_type_weak_len_extra(t) = 1;
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op = sexp_make_type_predicate(ctx, name=sexp_c_string(ctx,"ephemeron?",-1), t);
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sexp_env_define(ctx, env, name=sexp_intern(ctx, "ephemeron?", -1), op);
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op = sexp_make_getter(ctx, name=sexp_c_string(ctx, "ephemeron-key", -1), t, SEXP_ZERO);
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sexp_env_define(ctx, env, name=sexp_intern(ctx, "ephemeron-key", -1), op);
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op = sexp_make_getter(ctx, name=sexp_c_string(ctx, "ephemeron-value", -1), t, SEXP_ONE);
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sexp_env_define(ctx, env, name=sexp_intern(ctx, "ephemeron-value", -1), op);
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sexp_define_foreign(ctx, env, "make-ephemeron", 2, sexp_make_ephemeron);
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sexp_define_foreign(ctx, env, "ephemeron-broken?", 1, sexp_ephemeron_brokenp_op);
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sexp_gc_release3(ctx);
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return SEXP_VOID;
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}
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