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20c62ffe4a
the ABI is incompatible we can't even necessarily refer to a global from within the bad library.
103 lines
4.2 KiB
C
103 lines
4.2 KiB
C
/* weak.c -- weak pointers and ephemerons */
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/* Copyright (c) 2010-2011 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, sexp_weak_vector_id;
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#define sexp_ephemeronp(x) sexp_check_tag(x, 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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#define sexp_weak_vector_p(x) sexp_check_tag(x, sexp_weak_vector_id)
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sexp sexp_make_ephemeron (sexp ctx, sexp self, sexp_sint_t 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 self, sexp_sint_t n, sexp eph) {
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return sexp_make_boolean(sexp_brokenp(eph));
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}
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sexp sexp_make_weak_vector (sexp ctx, sexp self, sexp_sint_t n, sexp len) {
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sexp vec, *x;
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int i, clen = sexp_unbox_fixnum(len);
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sexp_assert_type(ctx, sexp_fixnump, SEXP_FIXNUM, len);
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vec = sexp_alloc_tagged(ctx, sexp_sizeof(vector) + clen*sizeof(sexp),
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SEXP_VECTOR);
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if (sexp_exceptionp(vec)) return vec;
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x = sexp_vector_data(vec);
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for (i=0; i<clen; i++)
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x[i] = SEXP_VOID;
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sexp_vector_length(vec) = clen;
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return vec;
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}
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sexp sexp_weak_vector_length (sexp ctx, sexp self, sexp_sint_t n, sexp v) {
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sexp_assert_type(ctx, sexp_weak_vector_p, sexp_weak_vector_id, v);
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return sexp_make_fixnum(sexp_vector_length(v));
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}
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sexp sexp_weak_vector_ref (sexp ctx, sexp self, sexp_sint_t n, sexp v, sexp k) {
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sexp_assert_type(ctx, sexp_weak_vector_p, sexp_weak_vector_id, v);
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sexp_assert_type(ctx, sexp_fixnump, SEXP_FIXNUM, k);
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return sexp_vector_ref(v, k);
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}
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sexp sexp_weak_vector_set (sexp ctx, sexp self, sexp_sint_t n, sexp v, sexp k, sexp x) {
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sexp_assert_type(ctx, sexp_weak_vector_p, sexp_weak_vector_id, v);
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sexp_assert_type(ctx, sexp_fixnump, SEXP_FIXNUM, k);
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sexp_vector_set(v, k, x);
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return SEXP_VOID;
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}
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sexp sexp_init_library (sexp ctx, sexp self, sexp_sint_t n, sexp env, const char* version, sexp_abi_identifier_t abi) {
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sexp v;
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sexp_gc_var3(name, t, op);
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if (!(sexp_version_compatible(ctx, version, sexp_version)
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&& sexp_abi_compatible(ctx, abi, SEXP_ABI_IDENTIFIER)))
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return SEXP_ABI_ERROR;
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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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name = sexp_c_string(ctx, "Weak-Vector", -1);
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t = sexp_register_simple_type(ctx, name, SEXP_FALSE, SEXP_ZERO);
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v = sexp_type_by_index(ctx, SEXP_VECTOR);
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sexp_weak_vector_id = sexp_type_tag(t);
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sexp_type_weak_base(t) = sexp_type_field_base(v);
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sexp_type_weak_len_off(t) = sexp_type_field_len_off(v);
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sexp_type_weak_len_scale(t) = sexp_type_field_len_scale(v);
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op = sexp_make_type_predicate(ctx, name=sexp_c_string(ctx,"weak-vector?",-1), t);
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sexp_env_define(ctx, env, name=sexp_intern(ctx, "weak-vector?", -1), op);
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sexp_define_foreign(ctx, env, "make-weak-vector", 1, sexp_make_weak_vector);
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sexp_define_foreign(ctx, env, "weak-vector-length", 2, sexp_weak_vector_length);
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sexp_define_foreign(ctx, env, "weak-vector-ref", 2, sexp_weak_vector_ref);
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sexp_define_foreign(ctx, env, "weak-vector-set!", 3, sexp_weak_vector_set);
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sexp_gc_release3(ctx);
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return SEXP_VOID;
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}
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