/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- * vim: set ts=8 sts=4 et sw=4 tw=99: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef jsatom_h #define jsatom_h #include "mozilla/HashFunctions.h" #include #include "jsalloc.h" #include "jsapi.h" #include "jsprvtd.h" #include "jspubtd.h" #include "gc/Barrier.h" #include "js/HashTable.h" #include "vm/CommonPropertyNames.h" struct JSIdArray { int length; js::HeapId vector[1]; /* actually, length jsid words */ }; namespace js { JS_STATIC_ASSERT(sizeof(HashNumber) == 4); static JS_ALWAYS_INLINE js::HashNumber HashId(jsid id) { return mozilla::HashGeneric(JSID_BITS(id)); } struct JsidHasher { typedef jsid Lookup; static HashNumber hash(const Lookup &l) { return HashNumber(JSID_BITS(l)); } static bool match(const jsid &id, const Lookup &l) { return id == l; } }; } /* namespace js */ /* * Return a printable, lossless char[] representation of a string-type atom. * The lifetime of the result matches the lifetime of bytes. */ extern const char * js_AtomToPrintableString(JSContext *cx, JSAtom *atom, JSAutoByteString *bytes); namespace js { /* Compute a hash function from chars/length. */ inline uint32_t HashChars(const jschar *chars, size_t length) { uint32_t h = 0; for (; length; chars++, length--) h = JS_ROTATE_LEFT32(h, 4) ^ *chars; return h; } class AtomStateEntry { uintptr_t bits; static const uintptr_t NO_TAG_MASK = uintptr_t(-1) - 1; public: AtomStateEntry() : bits(0) {} AtomStateEntry(const AtomStateEntry &other) : bits(other.bits) {} AtomStateEntry(JSAtom *ptr, bool tagged) : bits(uintptr_t(ptr) | uintptr_t(tagged)) { JS_ASSERT((uintptr_t(ptr) & 0x1) == 0); } bool isTagged() const { return bits & 0x1; } /* * Non-branching code sequence. Note that the const_cast is safe because * the hash function doesn't consider the tag to be a portion of the key. */ void setTagged(bool enabled) const { const_cast(this)->bits |= uintptr_t(enabled); } JSAtom *asPtr() const; }; struct AtomHasher { struct Lookup { const jschar *chars; size_t length; const JSAtom *atom; /* Optional. */ Lookup(const jschar *chars, size_t length) : chars(chars), length(length), atom(NULL) {} inline Lookup(const JSAtom *atom); }; static HashNumber hash(const Lookup &l) { return HashChars(l.chars, l.length); } static inline bool match(const AtomStateEntry &entry, const Lookup &lookup); }; typedef HashSet AtomSet; class PropertyName; } /* namespace js */ extern bool AtomIsInterned(JSContext *cx, JSAtom *atom); /* Well-known predefined C strings. */ #define DECLARE_PROTO_STR(name,code,init) extern const char js_##name##_str[]; JS_FOR_EACH_PROTOTYPE(DECLARE_PROTO_STR) #undef DECLARE_PROTO_STR #define DECLARE_CONST_CHAR_STR(idpart, id, text) extern const char js_##idpart##_str[]; FOR_EACH_COMMON_PROPERTYNAME(DECLARE_CONST_CHAR_STR) #undef DECLARE_CONST_CHAR_STR /* Constant strings that are not atomized. */ extern const char js_break_str[]; extern const char js_case_str[]; extern const char js_catch_str[]; extern const char js_class_str[]; extern const char js_const_str[]; extern const char js_continue_str[]; extern const char js_debugger_str[]; extern const char js_default_str[]; extern const char js_do_str[]; extern const char js_else_str[]; extern const char js_enum_str[]; extern const char js_export_str[]; extern const char js_extends_str[]; extern const char js_finally_str[]; extern const char js_for_str[]; extern const char js_getter_str[]; extern const char js_if_str[]; extern const char js_implements_str[]; extern const char js_import_str[]; extern const char js_in_str[]; extern const char js_instanceof_str[]; extern const char js_interface_str[]; extern const char js_let_str[]; extern const char js_new_str[]; extern const char js_package_str[]; extern const char js_private_str[]; extern const char js_protected_str[]; extern const char js_public_str[]; extern const char js_setter_str[]; extern const char js_static_str[]; extern const char js_super_str[]; extern const char js_switch_str[]; extern const char js_this_str[]; extern const char js_try_str[]; extern const char js_typeof_str[]; extern const char js_void_str[]; extern const char js_while_str[]; extern const char js_with_str[]; extern const char js_yield_str[]; #if JS_HAS_GENERATORS extern const char js_close_str[]; extern const char js_send_str[]; #endif namespace js { extern const char * const TypeStrings[]; /* * 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 InitAtoms(JSRuntime *rt); /* * Free and clear atom state including any interned string atoms. This * function must be called before js_FinishGC. */ extern void FinishAtoms(JSRuntime *rt); /* * Atom tracing and garbage collection hooks. */ extern void MarkAtoms(JSTracer *trc); extern void SweepAtoms(JSRuntime *rt); extern bool InitCommonNames(JSContext *cx); extern void FinishCommonNames(JSRuntime *rt); /* N.B. must correspond to boolean tagging behavior. */ enum InternBehavior { DoNotInternAtom = false, InternAtom = true }; extern JSAtom * Atomize(JSContext *cx, const char *bytes, size_t length, js::InternBehavior ib = js::DoNotInternAtom); template extern JSAtom * AtomizeChars(JSContext *cx, const jschar *chars, size_t length, js::InternBehavior ib = js::DoNotInternAtom); template extern JSAtom * AtomizeString(JSContext *cx, JSString *str, js::InternBehavior ib = js::DoNotInternAtom); template extern JSAtom * ToAtom(JSContext *cx, typename MaybeRooted::HandleType v); template bool XDRAtom(XDRState *xdr, js::MutableHandleAtom atomp); } /* namespace js */ #endif /* jsatom_h */