C++ JS_ReportOutOfMemory函数代码示例

bool
Throw(JSContext* aCx, nsresult aRv, const char* aMessage)
{
  if (JS_IsExceptionPending(aCx)) {
    // Don't clobber the existing exception.
    return false;
  }

  CycleCollectedJSRuntime* runtime = CycleCollectedJSRuntime::Get();
  nsCOMPtr<nsIException> existingException = runtime->GetPendingException();
  if (existingException) {
    nsresult nr;
    if (NS_SUCCEEDED(existingException->GetResult(&nr)) && 
        aRv == nr) {
      // Reuse the existing exception.

      // Clear pending exception
      runtime->SetPendingException(nullptr);

      if (!ThrowExceptionObject(aCx, existingException)) {
        // If we weren't able to throw an exception we're
        // most likely out of memory
        JS_ReportOutOfMemory(aCx);
      }
      return false;
    }
  }

  nsRefPtr<Exception> finalException;

  // Do we use DOM exceptions for this error code?
  switch (NS_ERROR_GET_MODULE(aRv)) {
  case NS_ERROR_MODULE_DOM:
  case NS_ERROR_MODULE_SVG:
  case NS_ERROR_MODULE_DOM_XPATH:
  case NS_ERROR_MODULE_DOM_INDEXEDDB:
  case NS_ERROR_MODULE_DOM_FILEHANDLE:
    finalException = DOMException::Create(aRv);
    break;

  default:
      break;
  }

  // If not, use the default.
  if (!finalException) {
    // aMessage can be null.
    finalException = new Exception(nsCString(aMessage), aRv,
                                   EmptyCString(), nullptr, nullptr);
  }

  MOZ_ASSERT(finalException);
  if (!ThrowExceptionObject(aCx, finalException)) {
    // If we weren't able to throw an exception we're
    // most likely out of memory
    JS_ReportOutOfMemory(aCx);
  }

  return false;
}

JS_XDRRegisterClass(JSXDRState *xdr, JSClass *clasp, uint32 *idp)
{
    uintN numclasses, maxclasses;
    JSClass **registry;

    numclasses = xdr->numclasses;
    maxclasses = xdr->maxclasses;
    if (numclasses == maxclasses) {
        maxclasses = (maxclasses == 0) ? CLASS_REGISTRY_MIN : maxclasses << 1;
        registry = (JSClass **)
            JS_realloc(xdr->cx, xdr->registry, maxclasses * sizeof(JSClass *));
        if (!registry)
            return JS_FALSE;
        xdr->registry = registry;
        xdr->maxclasses = maxclasses;
    } else {
        JS_ASSERT(numclasses && numclasses < maxclasses);
        registry = xdr->registry;
    }

    registry[numclasses] = clasp;
    if (xdr->reghash) {
        JSRegHashEntry *entry = (JSRegHashEntry *)
            JS_DHashTableOperate(xdr->reghash, clasp->name, JS_DHASH_ADD);
        if (!entry) {
            JS_ReportOutOfMemory(xdr->cx);
            return JS_FALSE;
        }
        entry->name = clasp->name;
        entry->index = numclasses;
    }
    *idp = CLASS_INDEX_TO_ID(numclasses);
    xdr->numclasses = ++numclasses;
    return JS_TRUE;
}

// static
void
XPCThrower::BuildAndThrowException(JSContext* cx, nsresult rv, const char* sz)
{
    JSBool success = false;

    /* no need to set an expection if the security manager already has */
    if (rv == NS_ERROR_XPC_SECURITY_MANAGER_VETO && JS_IsExceptionPending(cx))
        return;
    nsCOMPtr<nsIException> finalException;
    nsCOMPtr<nsIException> defaultException;
    nsXPCException::NewException(sz, rv, nsnull, nsnull, getter_AddRefs(defaultException));

    nsIExceptionManager * exceptionManager = XPCJSRuntime::Get()->GetExceptionManager();
    if (exceptionManager) {
        // Ask the provider for the exception, if there is no provider
        // we expect it to set e to null
        exceptionManager->GetExceptionFromProvider(rv,
                                                   defaultException,
                                                   getter_AddRefs(finalException));
        // We should get at least the defaultException back,
        // but just in case
        if (finalException == nsnull) {
            finalException = defaultException;
        }
    }

    // XXX Should we put the following test and call to JS_ReportOutOfMemory
    // inside this test?
    if (finalException)
        success = ThrowExceptionObject(cx, finalException);
    // If we weren't able to build or throw an exception we're
    // most likely out of memory
    if (!success)
        JS_ReportOutOfMemory(cx);
}

/*
 * Convert a JavaSignature object into a string format as used by
 * the JNI functions, e.g. java.lang.Object ==> "Ljava/lang/Object;"
 * The caller is responsible for freeing the resulting string.
 *
 * If an error is encountered, NULL is returned and an error reported.
 */
const char *
jsj_ConvertJavaSignatureToString(JSContext *cx, JavaSignature *signature)
{
    char *sig;

    if (IS_OBJECT_TYPE(signature->type)) {
        /* A non-array object class */
        sig = JS_smprintf("L%s;", signature->name);
        if (sig)
            jsj_MakeJNIClassname(sig);

    } else if (signature->type == JAVA_SIGNATURE_ARRAY) {
        /* An array class */
        const char *component_signature_string;

        component_signature_string =
            jsj_ConvertJavaSignatureToString(cx, signature->array_component_signature);
        if (!component_signature_string)
            return NULL;
        sig = JS_smprintf("[%s", component_signature_string);
        JS_smprintf_free((char*)component_signature_string);

    } else {
        /* A primitive class */
        sig = JS_smprintf("%c", get_jdk_signature_char(signature->type));
    }

    if (!sig) {
        JS_ReportOutOfMemory(cx);
        return NULL;
    }
    return sig;
}

/*
 * Convert a JavaSignature object into a human-readable string format as seen
 * in Java source files, e.g. "byte", or "int[][]" or "java.lang.String".
 * The caller is responsible for freeing the resulting string.
 *
 * If an error is encountered, NULL is returned and an error reported.
 */
const char *
jsj_ConvertJavaSignatureToHRString(JSContext *cx,
                                   JavaSignature *signature)
{
    char *sig;
    JavaSignature *acs;

    if (signature->type == JAVA_SIGNATURE_ARRAY) {
        /* An array class */
        const char *component_signature_string;
        acs = signature->array_component_signature;
        component_signature_string =
            jsj_ConvertJavaSignatureToHRString(cx, acs);
        if (!component_signature_string)
            return NULL;
        sig = JS_smprintf("%s[]", component_signature_string);
        JS_smprintf_free((char*)component_signature_string);

    } else {
        /* A primitive class or a non-array object class */
        sig = JS_smprintf("%s", signature->name);
    }

    if (!sig) {
        JS_ReportOutOfMemory(cx);
        return NULL;
    }
    return sig;
}

PJS_EXTERN JSBool
PJS_Call_js_function(
    pTHX_
    JSContext *cx,
    JSObject *gobj,
    jsval func,
    AV *av,
    jsval *rval
) {
    jsval *arg_list;
    SV *val;
    int arg_count, i;
    JSBool res;
    
    arg_count = av_len(av);

    Newz(1, arg_list, arg_count + 1, jsval);
    if(!arg_list) {
	JS_ReportOutOfMemory(cx);
	return JS_FALSE;
    }

    for(i = 0; i <= arg_count; i++) {
        val = *av_fetch(av, i, 0);

        if (!PJS_ReflectPerl2JS(aTHX_ cx, gobj, val, &(arg_list[i]))) {
            Safefree(arg_list);
            croak("Can't convert argument number %d to jsval", i);
        }
    }
    res = JS_CallFunctionValue(cx, gobj, func, i, arg_list, rval);
    Safefree(arg_list);
    return res;
}

NS_IMETHODIMP
nsJetpack::NewResolve(nsIXPConnectWrappedNative *wrapper,
                      JSContext * cx, JSObject * obj,
                      jsval id, PRUint32 flags,
                      JSObject * *objp, PRBool *_retval)
{
  if (JSVAL_IS_STRING(id) &&
      strncmp(JS_GetStringBytes(JSVAL_TO_STRING(id)), "get", 3) == 0) {
    JSFunction *get = JS_NewFunction(cx, getEndpoint, 0, 0, 
                                     JS_GetParent(cx, obj), "get");
    if (!get) {
      JS_ReportOutOfMemory(cx);
      *_retval = PR_FALSE;
      return NS_OK;
    }
      
    JSObject *getObj = JS_GetFunctionObject(get);

    jsid idid;
    *objp = obj;
    *_retval = (JS_ValueToId(cx, id, &idid) &&
                JS_DefinePropertyById(cx, obj, idid,
                                      OBJECT_TO_JSVAL(getObj),
                                      nsnull, nsnull,
                                      JSPROP_ENUMERATE |
                                      JSPROP_READONLY |
                                      JSPROP_PERMANENT));
    return NS_OK;
  }

  *objp = nsnull;
  *_retval = PR_TRUE;

  return NS_OK;
}

static JSAtom *
js_AtomizeHashedKey(JSContext *cx, jsval key, JSHashNumber keyHash, uintN flags)
{
    JSAtomState *state;
    JSHashTable *table;
    JSHashEntry *he, **hep;
    JSAtom *atom;

    state = &cx->runtime->atomState;
    JS_LOCK(&state->lock, cx);
    table = state->table;
    hep = JS_HashTableRawLookup(table, keyHash, (void *)key);
    if ((he = *hep) == NULL) {
        he = JS_HashTableRawAdd(table, hep, keyHash, (void *)key, NULL);
        if (!he) {
            JS_ReportOutOfMemory(cx);
            atom = NULL;
            goto out;
        }
    }

    atom = (JSAtom *)he;
    atom->flags |= flags;
out:
    JS_UNLOCK(&state->lock,cx);
    return atom;
}

static JSBool
GrowTokenBuf(JSContext *cx, JSTokenBuf *tb)
{
    jschar *base;
    ptrdiff_t offset, length;
    size_t tbsize;
    JSArenaPool *pool;

    base = tb->base;
    offset = PTRDIFF(tb->ptr, base, jschar);
    pool = &cx->tempPool;
    if (!base) {
        tbsize = TBMIN * sizeof(jschar);
        length = TBMIN;
        JS_ARENA_ALLOCATE_CAST(base, jschar *, pool, tbsize);
    } else {
        length = PTRDIFF(tb->limit, base, jschar);
        tbsize = length * sizeof(jschar);
        length <<= 1;
        JS_ARENA_GROW_CAST(base, jschar *, pool, tbsize, tbsize);
    }
    if (!base) {
        JS_ReportOutOfMemory(cx);
        return JS_FALSE;
    }
    tb->base = base;
    tb->limit = base + length;
    tb->ptr = base + offset;
    return JS_TRUE;
}

bool
Throw(JSContext* aCx, nsresult aRv, const nsACString& aMessage)
{
  if (aRv == NS_ERROR_UNCATCHABLE_EXCEPTION) {
    // Nuke any existing exception on aCx, to make sure we're uncatchable.
    JS_ClearPendingException(aCx);
    return false;
  }

  if (JS_IsExceptionPending(aCx)) {
    // Don't clobber the existing exception.
    return false;
  }

  CycleCollectedJSRuntime* runtime = CycleCollectedJSRuntime::Get();
  nsCOMPtr<nsIException> existingException = runtime->GetPendingException();
  // Make sure to clear the pending exception now.  Either we're going to reuse
  // it (and we already grabbed it), or we plan to throw something else and this
  // pending exception is no longer relevant.
  runtime->SetPendingException(nullptr);

  // Ignore the pending exception if we have a non-default message passed in.
  if (aMessage.IsEmpty() && existingException) {
    nsresult nr;
    if (NS_SUCCEEDED(existingException->GetResult(&nr)) &&
        aRv == nr) {
      // Reuse the existing exception.
      if (!ThrowExceptionObject(aCx, existingException)) {
        // If we weren't able to throw an exception we're
        // most likely out of memory
        JS_ReportOutOfMemory(aCx);
      }
      return false;
    }
  }

  RefPtr<Exception> finalException = CreateException(aCx, aRv, aMessage);

  MOZ_ASSERT(finalException);
  if (!ThrowExceptionObject(aCx, finalException)) {
    // If we weren't able to throw an exception we're
    // most likely out of memory
    JS_ReportOutOfMemory(aCx);
  }

  return false;
}

bool
Throw(JSContext* aCx, nsresult aRv, const char* aMessage)
{
  if (aRv == NS_ERROR_UNCATCHABLE_EXCEPTION) {
    // Nuke any existing exception on aCx, to make sure we're uncatchable.
    JS_ClearPendingException(aCx);
    return false;
  }

  if (JS_IsExceptionPending(aCx)) {
    // Don't clobber the existing exception.
    return false;
  }

  CycleCollectedJSRuntime* runtime = CycleCollectedJSRuntime::Get();
  nsCOMPtr<nsIException> existingException = runtime->GetPendingException();
  if (existingException) {
    nsresult nr;
    if (NS_SUCCEEDED(existingException->GetResult(&nr)) && 
        aRv == nr) {
      // Reuse the existing exception.

      // Clear pending exception
      runtime->SetPendingException(nullptr);

      if (!ThrowExceptionObject(aCx, existingException)) {
        // If we weren't able to throw an exception we're
        // most likely out of memory
        JS_ReportOutOfMemory(aCx);
      }
      return false;
    }
  }

  nsRefPtr<Exception> finalException = CreateException(aCx, aRv, aMessage);

  MOZ_ASSERT(finalException);
  if (!ThrowExceptionObject(aCx, finalException)) {
    // If we weren't able to throw an exception we're
    // most likely out of memory
    JS_ReportOutOfMemory(aCx);
  }

  return false;
}

js_alloc_temp_space(void *priv, size_t size)
{
    JSContext *cx = priv;
    void *space;

    JS_ARENA_ALLOCATE(space, &cx->tempPool, size);
    if (!space)
        JS_ReportOutOfMemory(cx);
    return space;
}

js_alloc_temp_entry(void *priv, const void *key)
{
    JSContext *cx = priv;
    JSAtomListElement *ale;

    JS_ARENA_ALLOCATE_TYPE(ale, JSAtomListElement, &cx->tempPool);
    if (!ale) {
        JS_ReportOutOfMemory(cx);
        return NULL;
    }
    return &ale->entry;
}

bool JSGlobal::JS_setInterval(JSContext *cx, JS::CallArgs &args)
{
    struct nidium_sm_timer *params;
    int ms = 0, i;
    int argc = args.length();

    params = new nidium_sm_timer(cx);

    if (!params) {
        JS_ReportOutOfMemory(cx);
        return false;
    }

    params->cx     = cx;
    params->global = m_Instance;
    params->argc   = nidium_max(0, argc - 2);

    params->argv = new JS::PersistentRootedValue *[params->argc];

    for (i = 0; i < argc - 2; i++) {
        params->argv[i] = new JS::PersistentRootedValue(cx);
    }

    if (!JSUtils::ReportIfNotFunction(cx, args[0])) {
        delete[] params->argv;
        delete params;
        return false;
    }

    params->func = args[0];

    if (argc > 1 && !JS::ToInt32(cx, args[1], &ms)) {
        ms = 0;
    }

    params->ms = nidium_max(8, ms);

    for (i = 0; i < static_cast<int>(argc) - 2; i++) {
        *params->argv[i] = args.array()[i + 2];
    }

    ape_timer_t *timer = APE_timer_create(
        static_cast<ape_global *>(JS_GetContextPrivate(cx)), params->ms,
        nidium_timerng_wrapper, static_cast<void *>(params));

    APE_timer_unprotect(timer);
    APE_timer_setclearfunc(timer, nidium_timer_deleted);

    args.rval().setNumber(static_cast<double>(APE_timer_getid(timer)));

    return true;
}

JSAtom *
js_AtomizeDouble(JSContext *cx, jsdouble d)
{
    JSAtomState *state;
    JSDHashTable *table;
    JSAtomHashEntry *entry;
    uint32 gen;
    jsdouble *key;
    jsval v;

    state = &cx->runtime->atomState;
    table = &state->doubleAtoms;

    JS_LOCK(cx, &state->lock);
    entry = TO_ATOM_ENTRY(JS_DHashTableOperate(table, &d, JS_DHASH_ADD));
    if (!entry)
        goto failed_hash_add;
    if (entry->keyAndFlags == 0) {
        gen = ++table->generation;
        JS_UNLOCK(cx, &state->lock);

        key = js_NewWeaklyRootedDouble(cx, d);
        if (!key)
            return NULL;

        JS_LOCK(cx, &state->lock);
        if (table->generation == gen) {
            JS_ASSERT(entry->keyAndFlags == 0);
        } else {
            entry = TO_ATOM_ENTRY(JS_DHashTableOperate(table, key,
                                                       JS_DHASH_ADD));
            if (!entry)
                goto failed_hash_add;
            if (entry->keyAndFlags != 0)
                goto finish;
            ++table->generation;
        }
        INIT_ATOM_ENTRY(entry, key);
    }

  finish:
    v = DOUBLE_TO_JSVAL((jsdouble *)ATOM_ENTRY_KEY(entry));
    cx->weakRoots.lastAtom = v;
    JS_UNLOCK(cx, &state->lock);

    return (JSAtom *)v;

  failed_hash_add:
    JS_UNLOCK(cx, &state->lock);
    JS_ReportOutOfMemory(cx);
    return NULL;
}