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gecko/js/src/jsatom.h

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsatom_h___
#define jsatom_h___
/*
* JS atom table.
*/
#include <stddef.h>
#include "jsversion.h"
#include "jstypes.h"
#include "jshash.h" /* Added by JSIFY */
#include "jsdhash.h"
#include "jsapi.h"
#include "jsprvtd.h"
#include "jspubtd.h"
#include "jslock.h"
JS_BEGIN_EXTERN_C
#define ATOM_PINNED 0x1 /* atom is pinned against GC */
#define ATOM_INTERNED 0x2 /* pinned variant for JS_Intern* API */
#define ATOM_NOCOPY 0x4 /* don't copy atom string bytes */
#define ATOM_TMPSTR 0x8 /* internal, to avoid extra string */
#define ATOM_KEY(atom) ((jsval)(atom))
#define ATOM_IS_DOUBLE(atom) JSVAL_IS_DOUBLE(ATOM_KEY(atom))
#define ATOM_TO_DOUBLE(atom) JSVAL_TO_DOUBLE(ATOM_KEY(atom))
#define ATOM_IS_STRING(atom) JSVAL_IS_STRING(ATOM_KEY(atom))
#define ATOM_TO_STRING(atom) JSVAL_TO_STRING(ATOM_KEY(atom))
#if JS_BYTES_PER_WORD == 4
# define ATOM_HASH(atom) ((JSHashNumber)(atom) >> 2)
#elif JS_BYTES_PER_WORD == 8
# define ATOM_HASH(atom) (((JSHashNumber)(jsuword)(atom) >> 3) ^ \
(JSHashNumber)((jsuword)(atom) >> 32))
#else
# error "Unsupported configuration"
#endif
/*
* Return a printable, lossless char[] representation of a string-type atom.
* The lifetime of the result extends at least until the next GC activation,
* longer if cx's string newborn root is not overwritten.
*/
extern const char *
js_AtomToPrintableString(JSContext *cx, JSAtom *atom);
struct JSAtomListElement {
JSHashEntry entry;
};
#define ALE_ATOM(ale) ((JSAtom *) (ale)->entry.key)
#define ALE_INDEX(ale) ((jsatomid) JS_PTR_TO_UINT32((ale)->entry.value))
#define ALE_VALUE(ale) ((jsval) (ale)->entry.value)
#define ALE_NEXT(ale) ((JSAtomListElement *) (ale)->entry.next)
/*
* In an upvars list, ALE_DEFN(ale)->resolve() is the outermost definition the
* name may reference. If a with block or a function that calls eval encloses
* the use, the name may end up referring to something else at runtime.
*/
#define ALE_DEFN(ale) ((JSDefinition *) (ale)->entry.value)
#define ALE_SET_ATOM(ale,atom) ((ale)->entry.key = (const void *)(atom))
#define ALE_SET_INDEX(ale,index)((ale)->entry.value = JS_UINT32_TO_PTR(index))
#define ALE_SET_DEFN(ale, dn) ((ale)->entry.value = (void *)(dn))
#define ALE_SET_VALUE(ale, v) ((ale)->entry.value = (void *)(v))
#define ALE_SET_NEXT(ale,nxt) ((ale)->entry.next = (JSHashEntry *)(nxt))
/*
* NB: JSAtomSet must be plain-old-data as it is embedded in the pn_u union in
* JSParseNode. JSAtomList encapsulates all operational uses of a JSAtomSet.
*
* The JSAtomList name is traditional, even though the implementation is a map
* (not to be confused with JSAtomMap). In particular the "ALE" and "ale" short
* names for JSAtomListElement variables roll off the fingers, compared to ASE
* or AME alternatives.
*/
struct JSAtomSet {
JSHashEntry *list; /* literals indexed for mapping */
JSHashTable *table; /* hash table if list gets too long */
jsuint count; /* count of indexed literals */
};
#ifdef __cplusplus
struct JSAtomList : public JSAtomSet
{
#ifdef DEBUG
const JSAtomSet* set; /* asserted null in mutating methods */
#endif
JSAtomList() {
list = NULL; table = NULL; count = 0;
#ifdef DEBUG
set = NULL;
#endif
}
JSAtomList(const JSAtomSet& as) {
list = as.list; table = as.table; count = as.count;
#ifdef DEBUG
set = &as;
#endif
}
void clear() { JS_ASSERT(!set); list = NULL; table = NULL; count = 0; }
JSAtomListElement *lookup(JSAtom *atom) {
JSHashEntry **hep;
return rawLookup(atom, hep);
}
JSAtomListElement *rawLookup(JSAtom *atom, JSHashEntry **&hep);
enum AddHow { UNIQUE, SHADOW, HOIST };
JSAtomListElement *add(JSCompiler *jsc, JSAtom *atom, AddHow how = UNIQUE);
void remove(JSCompiler *jsc, JSAtom *atom) {
JSHashEntry **hep;
JSAtomListElement *ale = rawLookup(atom, hep);
if (ale)
rawRemove(jsc, ale, hep);
}
void rawRemove(JSCompiler *jsc, JSAtomListElement *ale, JSHashEntry **hep);
};
/*
* Iterate over an atom list. We define a call operator to minimize the syntax
* tax for users. We do not use a more standard pattern using ++ and * because
* (a) it's the wrong pattern for a non-scalar; (b) it's overkill -- one method
* is enough. (This comment is overkill!)
*/
class JSAtomListIterator {
JSAtomList* list;
JSAtomListElement* next;
uint32 index;
public:
JSAtomListIterator(JSAtomList* al) : list(al) { reset(); }
void reset() {
next = (JSAtomListElement *) list->list;
index = 0;
}
JSAtomListElement* operator ()();
};
#endif /* __cplusplus */
struct JSAtomMap {
JSAtom **vector; /* array of ptrs to indexed atoms */
jsatomid length; /* count of (to-be-)indexed atoms */
};
struct JSAtomState {
JSDHashTable stringAtoms; /* hash table with shared strings */
JSDHashTable doubleAtoms; /* hash table with shared doubles */
#ifdef JS_THREADSAFE
JSThinLock lock;
#endif
/*
* From this point until the end of struct definition the struct must
* contain only JSAtom fields. We use this to access the storage occupied
* by the common atoms in js_FinishCommonAtoms.
*
* js_common_atom_names defined in jsatom.c contains C strings for atoms
* in the order of atom fields here. Therefore you must update that array
* if you change member order here.
*/
/* The rt->emptyString atom, see jsstr.c's js_InitRuntimeStringState. */
JSAtom *emptyAtom;
/*
* Literal value and type names.
* NB: booleanAtoms must come right before typeAtoms!
*/
JSAtom *booleanAtoms[2];
JSAtom *typeAtoms[JSTYPE_LIMIT];
JSAtom *nullAtom;
/* Standard class constructor or prototype names. */
JSAtom *classAtoms[JSProto_LIMIT];
/* Various built-in or commonly-used atoms, pinned on first context. */
JSAtom *anonymousAtom;
JSAtom *applyAtom;
JSAtom *argumentsAtom;
JSAtom *arityAtom;
JSAtom *callAtom;
JSAtom *calleeAtom;
JSAtom *callerAtom;
JSAtom *classPrototypeAtom;
JSAtom *constructorAtom;
JSAtom *countAtom;
JSAtom *eachAtom;
JSAtom *evalAtom;
JSAtom *fileNameAtom;
JSAtom *getAtom;
JSAtom *getterAtom;
JSAtom *indexAtom;
JSAtom *inputAtom;
JSAtom *iteratorAtom;
JSAtom *lengthAtom;
JSAtom *lineNumberAtom;
JSAtom *messageAtom;
JSAtom *nameAtom;
JSAtom *nextAtom;
JSAtom *noSuchMethodAtom;
JSAtom *parentAtom;
JSAtom *protoAtom;
JSAtom *setAtom;
JSAtom *setterAtom;
JSAtom *stackAtom;
JSAtom *toLocaleStringAtom;
JSAtom *toSourceAtom;
JSAtom *toStringAtom;
JSAtom *valueOfAtom;
JSAtom *toJSONAtom;
JSAtom *void0Atom;
#if JS_HAS_XML_SUPPORT
JSAtom *etagoAtom;
JSAtom *namespaceAtom;
JSAtom *ptagcAtom;
JSAtom *qualifierAtom;
JSAtom *spaceAtom;
JSAtom *stagoAtom;
JSAtom *starAtom;
JSAtom *starQualifierAtom;
JSAtom *tagcAtom;
JSAtom *xmlAtom;
#endif
#ifdef NARCISSUS
JSAtom *__call__Atom;
JSAtom *__construct__Atom;
JSAtom *__hasInstance__Atom;
JSAtom *ExecutionContextAtom;
JSAtom *currentAtom;
#endif
/* Less frequently used atoms, pinned lazily by JS_ResolveStandardClass. */
struct {
JSAtom *InfinityAtom;
JSAtom *NaNAtom;
JSAtom *XMLListAtom;
JSAtom *decodeURIAtom;
JSAtom *decodeURIComponentAtom;
JSAtom *defineGetterAtom;
JSAtom *defineSetterAtom;
JSAtom *encodeURIAtom;
JSAtom *encodeURIComponentAtom;
JSAtom *escapeAtom;
JSAtom *functionNamespaceURIAtom;
JSAtom *hasOwnPropertyAtom;
JSAtom *isFiniteAtom;
JSAtom *isNaNAtom;
JSAtom *isPrototypeOfAtom;
JSAtom *isXMLNameAtom;
JSAtom *lookupGetterAtom;
JSAtom *lookupSetterAtom;
JSAtom *parseFloatAtom;
JSAtom *parseIntAtom;
JSAtom *propertyIsEnumerableAtom;
JSAtom *unescapeAtom;
JSAtom *unevalAtom;
JSAtom *unwatchAtom;
JSAtom *watchAtom;
} lazy;
};
#define ATOM_OFFSET_START offsetof(JSAtomState, emptyAtom)
#define LAZY_ATOM_OFFSET_START offsetof(JSAtomState, lazy)
#define ATOM_OFFSET_LIMIT (sizeof(JSAtomState))
#define COMMON_ATOMS_START(state) \
((JSAtom **)((uint8 *)(state) + ATOM_OFFSET_START))
#define COMMON_ATOM_INDEX(name) \
((offsetof(JSAtomState, name##Atom) - ATOM_OFFSET_START) \
/ sizeof(JSAtom*))
#define COMMON_TYPE_ATOM_INDEX(type) \
((offsetof(JSAtomState, typeAtoms[type]) - ATOM_OFFSET_START) \
/ sizeof(JSAtom*))
#define ATOM_OFFSET(name) offsetof(JSAtomState, name##Atom)
#define OFFSET_TO_ATOM(rt,off) (*(JSAtom **)((char*)&(rt)->atomState + (off)))
#define CLASS_ATOM_OFFSET(name) offsetof(JSAtomState,classAtoms[JSProto_##name])
#define CLASS_ATOM(cx,name) \
((cx)->runtime->atomState.classAtoms[JSProto_##name])
extern const char *const js_common_atom_names[];
extern const size_t js_common_atom_count;
/*
* Macros to access C strings for JSType and boolean literals.
*/
#define JS_BOOLEAN_STR(type) (js_common_atom_names[1 + (type)])
#define JS_TYPE_STR(type) (js_common_atom_names[1 + 2 + (type)])
/* Well-known predefined C strings. */
#define JS_PROTO(name,code,init) extern const char js_##name##_str[];
#include "jsproto.tbl"
#undef JS_PROTO
extern const char js_anonymous_str[];
extern const char js_apply_str[];
extern const char js_arguments_str[];
extern const char js_arity_str[];
extern const char js_call_str[];
extern const char js_callee_str[];
extern const char js_caller_str[];
extern const char js_class_prototype_str[];
extern const char js_close_str[];
extern const char js_constructor_str[];
extern const char js_count_str[];
extern const char js_etago_str[];
extern const char js_each_str[];
extern const char js_eval_str[];
extern const char js_fileName_str[];
extern const char js_get_str[];
extern const char js_getter_str[];
extern const char js_index_str[];
extern const char js_input_str[];
extern const char js_iterator_str[];
extern const char js_length_str[];
extern const char js_lineNumber_str[];
extern const char js_message_str[];
extern const char js_name_str[];
extern const char js_namespace_str[];
extern const char js_next_str[];
extern const char js_noSuchMethod_str[];
extern const char js_object_str[];
extern const char js_parent_str[];
extern const char js_proto_str[];
extern const char js_ptagc_str[];
extern const char js_qualifier_str[];
extern const char js_send_str[];
extern const char js_setter_str[];
extern const char js_set_str[];
extern const char js_space_str[];
extern const char js_stack_str[];
extern const char js_stago_str[];
extern const char js_star_str[];
extern const char js_starQualifier_str[];
extern const char js_tagc_str[];
extern const char js_toSource_str[];
extern const char js_toString_str[];
extern const char js_toLocaleString_str[];
extern const char js_undefined_str[];
extern const char js_valueOf_str[];
extern const char js_toJSON_str[];
extern const char js_xml_str[];
#ifdef NARCISSUS
extern const char js___call___str[];
extern const char js___construct___str[];
extern const char js___hasInstance___str[];
extern const char js_ExecutionContext_str[];
extern const char js_current_str[];
#endif
/*
* Initialize atom state. Return true on success, false on failure to allocate
* memory. The caller must zero rt->atomState before calling this function and
* only call it after js_InitGC successfully returns.
*/
extern JSBool
js_InitAtomState(JSRuntime *rt);
/*
* Free and clear atom state including any interned string atoms. This
* function must be called before js_FinishGC.
*/
extern void
js_FinishAtomState(JSRuntime *rt);
/*
* Atom tracing and garbage collection hooks.
*/
extern void
js_TraceAtomState(JSTracer *trc, JSBool allAtoms);
extern void
js_SweepAtomState(JSContext *cx);
extern JSBool
js_InitCommonAtoms(JSContext *cx);
extern void
js_FinishCommonAtoms(JSContext *cx);
/*
* Find or create the atom for a double value. Return null on failure to
* allocate memory.
*/
extern JSAtom *
js_AtomizeDouble(JSContext *cx, jsdouble d);
/*
* Find or create the atom for a string. Return null on failure to allocate
* memory.
*/
extern JSAtom *
js_AtomizeString(JSContext *cx, JSString *str, uintN flags);
extern JSAtom *
js_Atomize(JSContext *cx, const char *bytes, size_t length, uintN flags);
extern JSAtom *
js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, uintN flags);
/*
* Return an existing atom for the given char array or null if the char
* sequence is currently not atomized.
*/
extern JSAtom *
js_GetExistingStringAtom(JSContext *cx, const jschar *chars, size_t length);
/*
* This variant handles all primitive values.
*/
JSBool
js_AtomizePrimitiveValue(JSContext *cx, jsval v, JSAtom **atomp);
#ifdef DEBUG
extern JS_FRIEND_API(void)
js_DumpAtoms(JSContext *cx, FILE *fp);
#endif
/*
* For all unmapped atoms recorded in al, add a mapping from the atom's index
* to its address. map->length must already be set to the number of atoms in
* the list and map->vector must point to pre-allocated memory.
*/
extern void
js_InitAtomMap(JSContext *cx, JSAtomMap *map, JSAtomList *al);
JS_END_EXTERN_C
#endif /* jsatom_h___ */
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