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js/jsd/jsd_atom.cpp@b8a032363ba2 (annotated)

js/jsd/jsd_atom.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0	2	* vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0	3	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	4	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	5	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	6
michael@0	7	/*
michael@0	8	* JavaScript Debugging support - Atom support
michael@0	9	*/
michael@0	10
michael@0	11	#include "jsd.h"
michael@0	12
michael@0	13	/* #define TEST_ATOMS 1 */
michael@0	14
michael@0	15	#ifdef TEST_ATOMS
michael@0	16	static void
michael@0	17	_testAtoms(JSDContext*jsdc)
michael@0	18	{
michael@0	19	JSDAtom* atom0 = jsd_AddAtom(jsdc, "foo");
michael@0	20	JSDAtom* atom1 = jsd_AddAtom(jsdc, "foo");
michael@0	21	JSDAtom* atom2 = jsd_AddAtom(jsdc, "bar");
michael@0	22	JSDAtom* atom3 = jsd_CloneAtom(jsdc, atom1);
michael@0	23	JSDAtom* atom4 = jsd_CloneAtom(jsdc, atom2);
michael@0	24
michael@0	25	const char* c0 = JSD_ATOM_TO_STRING(atom0);
michael@0	26	const char* c1 = JSD_ATOM_TO_STRING(atom1);
michael@0	27	const char* c2 = JSD_ATOM_TO_STRING(atom2);
michael@0	28	const char* c3 = JSD_ATOM_TO_STRING(atom3);
michael@0	29	const char* c4 = JSD_ATOM_TO_STRING(atom4);
michael@0	30
michael@0	31	jsd_DropAtom(jsdc, atom0);
michael@0	32	jsd_DropAtom(jsdc, atom1);
michael@0	33	jsd_DropAtom(jsdc, atom2);
michael@0	34	jsd_DropAtom(jsdc, atom3);
michael@0	35	jsd_DropAtom(jsdc, atom4);
michael@0	36	}
michael@0	37	#endif
michael@0	38
michael@0	39	static int
michael@0	40	_atom_smasher(JSHashEntry *he, int i, void *arg)
michael@0	41	{
michael@0	42	MOZ_ASSERT(he);
michael@0	43	MOZ_ASSERT(he->value);
michael@0	44	MOZ_ASSERT(((JSDAtom*)(he->value))->str);
michael@0	45
michael@0	46	free(((JSDAtom*)(he->value))->str);
michael@0	47	free(he->value);
michael@0	48	he->value = nullptr;
michael@0	49	he->key = nullptr;
michael@0	50	return HT_ENUMERATE_NEXT;
michael@0	51	}
michael@0	52
michael@0	53	static int
michael@0	54	_compareAtomKeys(const void *v1, const void *v2)
michael@0	55	{
michael@0	56	return 0 == strcmp((const char*)v1, (const char*)v2);
michael@0	57	}
michael@0	58
michael@0	59	static int
michael@0	60	_compareAtoms(const void *v1, const void *v2)
michael@0	61	{
michael@0	62	return 0 == strcmp(((JSDAtom*)v1)->str, ((JSDAtom*)v2)->str);
michael@0	63	}
michael@0	64
michael@0	65
michael@0	66	bool
michael@0	67	jsd_CreateAtomTable(JSDContext* jsdc)
michael@0	68	{
michael@0	69	jsdc->atoms = JS_NewHashTable(256, JS_HashString,
michael@0	70	_compareAtomKeys, _compareAtoms,
michael@0	71	nullptr, nullptr);
michael@0	72	#ifdef TEST_ATOMS
michael@0	73	_testAtoms(jsdc);
michael@0	74	#endif
michael@0	75	return !!jsdc->atoms;
michael@0	76	}
michael@0	77
michael@0	78	void
michael@0	79	jsd_DestroyAtomTable(JSDContext* jsdc)
michael@0	80	{
michael@0	81	if( jsdc->atoms )
michael@0	82	{
michael@0	83	JS_HashTableEnumerateEntries(jsdc->atoms, _atom_smasher, nullptr);
michael@0	84	JS_HashTableDestroy(jsdc->atoms);
michael@0	85	jsdc->atoms = nullptr;
michael@0	86	}
michael@0	87	}
michael@0	88
michael@0	89	JSDAtom*
michael@0	90	jsd_AddAtom(JSDContext* jsdc, const char* str)
michael@0	91	{
michael@0	92	JSDAtom* atom;
michael@0	93
michael@0	94	if(!str)
michael@0	95	{
michael@0	96	MOZ_ASSERT(0);
michael@0	97	return nullptr;
michael@0	98	}
michael@0	99
michael@0	100	JSD_LOCK_ATOMS(jsdc);
michael@0	101
michael@0	102	atom = (JSDAtom*) JS_HashTableLookup(jsdc->atoms, str);
michael@0	103
michael@0	104	if( atom )
michael@0	105	atom->refcount++;
michael@0	106	else
michael@0	107	{
michael@0	108	atom = (JSDAtom*) malloc(sizeof(JSDAtom));
michael@0	109	if( atom )
michael@0	110	{
michael@0	111	atom->str = strdup(str);
michael@0	112	atom->refcount = 1;
michael@0	113	if(!JS_HashTableAdd(jsdc->atoms, atom->str, atom))
michael@0	114	{
michael@0	115	free(atom->str);
michael@0	116	free(atom);
michael@0	117	atom = nullptr;
michael@0	118	}
michael@0	119	}
michael@0	120	}
michael@0	121
michael@0	122	JSD_UNLOCK_ATOMS(jsdc);
michael@0	123	return atom;
michael@0	124	}
michael@0	125
michael@0	126	JSDAtom*
michael@0	127	jsd_CloneAtom(JSDContext* jsdc, JSDAtom* atom)
michael@0	128	{
michael@0	129	JSD_LOCK_ATOMS(jsdc);
michael@0	130	atom->refcount++;
michael@0	131	JSD_UNLOCK_ATOMS(jsdc);
michael@0	132	return atom;
michael@0	133	}
michael@0	134
michael@0	135	void
michael@0	136	jsd_DropAtom(JSDContext* jsdc, JSDAtom* atom)
michael@0	137	{
michael@0	138	JSD_LOCK_ATOMS(jsdc);
michael@0	139	if(! --atom->refcount)
michael@0	140	{
michael@0	141	JS_HashTableRemove(jsdc->atoms, atom->str);
michael@0	142	free(atom->str);
michael@0	143	free(atom);
michael@0	144	}
michael@0	145	JSD_UNLOCK_ATOMS(jsdc);
michael@0	146	}
michael@0	147