1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/jsd/jsd_atom.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,147 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/*
1.11 + * JavaScript Debugging support - Atom support
1.12 + */
1.13 +
1.14 +#include "jsd.h"
1.15 +
1.16 +/* #define TEST_ATOMS 1 */
1.17 +
1.18 +#ifdef TEST_ATOMS
1.19 +static void
1.20 +_testAtoms(JSDContext*jsdc)
1.21 +{
1.22 + JSDAtom* atom0 = jsd_AddAtom(jsdc, "foo");
1.23 + JSDAtom* atom1 = jsd_AddAtom(jsdc, "foo");
1.24 + JSDAtom* atom2 = jsd_AddAtom(jsdc, "bar");
1.25 + JSDAtom* atom3 = jsd_CloneAtom(jsdc, atom1);
1.26 + JSDAtom* atom4 = jsd_CloneAtom(jsdc, atom2);
1.27 +
1.28 + const char* c0 = JSD_ATOM_TO_STRING(atom0);
1.29 + const char* c1 = JSD_ATOM_TO_STRING(atom1);
1.30 + const char* c2 = JSD_ATOM_TO_STRING(atom2);
1.31 + const char* c3 = JSD_ATOM_TO_STRING(atom3);
1.32 + const char* c4 = JSD_ATOM_TO_STRING(atom4);
1.33 +
1.34 + jsd_DropAtom(jsdc, atom0);
1.35 + jsd_DropAtom(jsdc, atom1);
1.36 + jsd_DropAtom(jsdc, atom2);
1.37 + jsd_DropAtom(jsdc, atom3);
1.38 + jsd_DropAtom(jsdc, atom4);
1.39 +}
1.40 +#endif
1.41 +
1.42 +static int
1.43 +_atom_smasher(JSHashEntry *he, int i, void *arg)
1.44 +{
1.45 + MOZ_ASSERT(he);
1.46 + MOZ_ASSERT(he->value);
1.47 + MOZ_ASSERT(((JSDAtom*)(he->value))->str);
1.48 +
1.49 + free(((JSDAtom*)(he->value))->str);
1.50 + free(he->value);
1.51 + he->value = nullptr;
1.52 + he->key = nullptr;
1.53 + return HT_ENUMERATE_NEXT;
1.54 +}
1.55 +
1.56 +static int
1.57 +_compareAtomKeys(const void *v1, const void *v2)
1.58 +{
1.59 + return 0 == strcmp((const char*)v1, (const char*)v2);
1.60 +}
1.61 +
1.62 +static int
1.63 +_compareAtoms(const void *v1, const void *v2)
1.64 +{
1.65 + return 0 == strcmp(((JSDAtom*)v1)->str, ((JSDAtom*)v2)->str);
1.66 +}
1.67 +
1.68 +
1.69 +bool
1.70 +jsd_CreateAtomTable(JSDContext* jsdc)
1.71 +{
1.72 + jsdc->atoms = JS_NewHashTable(256, JS_HashString,
1.73 + _compareAtomKeys, _compareAtoms,
1.74 + nullptr, nullptr);
1.75 +#ifdef TEST_ATOMS
1.76 + _testAtoms(jsdc);
1.77 +#endif
1.78 + return !!jsdc->atoms;
1.79 +}
1.80 +
1.81 +void
1.82 +jsd_DestroyAtomTable(JSDContext* jsdc)
1.83 +{
1.84 + if( jsdc->atoms )
1.85 + {
1.86 + JS_HashTableEnumerateEntries(jsdc->atoms, _atom_smasher, nullptr);
1.87 + JS_HashTableDestroy(jsdc->atoms);
1.88 + jsdc->atoms = nullptr;
1.89 + }
1.90 +}
1.91 +
1.92 +JSDAtom*
1.93 +jsd_AddAtom(JSDContext* jsdc, const char* str)
1.94 +{
1.95 + JSDAtom* atom;
1.96 +
1.97 + if(!str)
1.98 + {
1.99 + MOZ_ASSERT(0);
1.100 + return nullptr;
1.101 + }
1.102 +
1.103 + JSD_LOCK_ATOMS(jsdc);
1.104 +
1.105 + atom = (JSDAtom*) JS_HashTableLookup(jsdc->atoms, str);
1.106 +
1.107 + if( atom )
1.108 + atom->refcount++;
1.109 + else
1.110 + {
1.111 + atom = (JSDAtom*) malloc(sizeof(JSDAtom));
1.112 + if( atom )
1.113 + {
1.114 + atom->str = strdup(str);
1.115 + atom->refcount = 1;
1.116 + if(!JS_HashTableAdd(jsdc->atoms, atom->str, atom))
1.117 + {
1.118 + free(atom->str);
1.119 + free(atom);
1.120 + atom = nullptr;
1.121 + }
1.122 + }
1.123 + }
1.124 +
1.125 + JSD_UNLOCK_ATOMS(jsdc);
1.126 + return atom;
1.127 +}
1.128 +
1.129 +JSDAtom*
1.130 +jsd_CloneAtom(JSDContext* jsdc, JSDAtom* atom)
1.131 +{
1.132 + JSD_LOCK_ATOMS(jsdc);
1.133 + atom->refcount++;
1.134 + JSD_UNLOCK_ATOMS(jsdc);
1.135 + return atom;
1.136 +}
1.137 +
1.138 +void
1.139 +jsd_DropAtom(JSDContext* jsdc, JSDAtom* atom)
1.140 +{
1.141 + JSD_LOCK_ATOMS(jsdc);
1.142 + if(! --atom->refcount)
1.143 + {
1.144 + JS_HashTableRemove(jsdc->atoms, atom->str);
1.145 + free(atom->str);
1.146 + free(atom);
1.147 + }
1.148 + JSD_UNLOCK_ATOMS(jsdc);
1.149 +}
1.150 +
