forked from mirrors/gecko-dev
593 lines
18 KiB
C++
593 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is js-ctypes.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation <http://www.mozilla.org/>.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mark Finkle <mark.finkle@gmail.com>, <mfinkle@mozilla.com>
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* Fredrik Larsson <nossralf@gmail.com>
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* Dan Witte <dwitte@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "Function.h"
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#include "nsComponentManagerUtils.h"
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#include "nsServiceManagerUtils.h"
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#include "nsIXPConnect.h"
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#include "nsCRT.h"
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namespace mozilla {
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namespace ctypes {
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/*******************************************************************************
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** Static helpers
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*******************************************************************************/
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template<class IntegerType>
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static bool
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jsvalToIntStrict(jsval aValue, IntegerType *aResult)
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{
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if (JSVAL_IS_INT(aValue)) {
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jsint i = JSVAL_TO_INT(aValue);
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*aResult = IntegerType(i);
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// Make sure the integer fits in the alotted precision, and has the right sign.
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return jsint(*aResult) == i &&
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(i < 0) == (*aResult < 0);
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}
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if (JSVAL_IS_DOUBLE(aValue)) {
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jsdouble d = *JSVAL_TO_DOUBLE(aValue);
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*aResult = IntegerType(d);
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// Don't silently lose bits here -- check that aValue really is an
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// integer value, and has the right sign.
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return jsdouble(*aResult) == d &&
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(d < 0) == (*aResult < 0);
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}
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if (JSVAL_IS_BOOLEAN(aValue)) {
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// Implicitly promote boolean values to 0 or 1, like C.
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*aResult = JSVAL_TO_BOOLEAN(aValue);
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NS_ASSERTION(*aResult == 0 || *aResult == 1, "invalid boolean");
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return true;
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}
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// Don't silently convert null to an integer. It's probably a mistake.
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return false;
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}
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static bool
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jsvalToDoubleStrict(jsval aValue, jsdouble *dp)
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{
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// Don't silently convert true to 1.0 or false to 0.0, even though C/C++
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// does it. It's likely to be a mistake.
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if (JSVAL_IS_INT(aValue)) {
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*dp = JSVAL_TO_INT(aValue);
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return true;
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}
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if (JSVAL_IS_DOUBLE(aValue)) {
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*dp = *JSVAL_TO_DOUBLE(aValue);
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return true;
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}
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return false;
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}
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static nsresult
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TypeError(JSContext *cx, const char *message)
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{
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JS_ReportError(cx, "%s", message);
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return NS_ERROR_FAILURE;
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}
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static nsresult
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GetABI(PRUint16 aCallType, ffi_abi& aResult)
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{
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// determine the ABI from the subset of those available on the
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// given platform. nsIForeignLibrary::DEFAULT specifies the default
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// C calling convention (cdecl) on each platform.
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switch (aCallType) {
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case nsIForeignLibrary::DEFAULT:
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aResult = FFI_DEFAULT_ABI;
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return NS_OK;
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#if defined(XP_WIN32)
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case nsIForeignLibrary::STDCALL:
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aResult = FFI_STDCALL;
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return NS_OK;
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#endif
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default:
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return NS_ERROR_INVALID_ARG;
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}
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}
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static nsresult
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PrepareType(JSContext* aContext, jsval aType, Type& aResult)
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{
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// for now, the only types we accept are integer values.
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if (!JSVAL_IS_INT(aType)) {
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JS_ReportError(aContext, "Invalid type specification");
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return NS_ERROR_FAILURE;
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}
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PRInt32 type = JSVAL_TO_INT(aType);
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switch (type) {
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case nsIForeignLibrary::VOID:
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aResult.mFFIType = ffi_type_void;
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break;
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case nsIForeignLibrary::INT8:
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aResult.mFFIType = ffi_type_sint8;
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break;
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case nsIForeignLibrary::INT16:
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aResult.mFFIType = ffi_type_sint16;
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break;
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case nsIForeignLibrary::INT32:
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aResult.mFFIType = ffi_type_sint32;
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break;
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case nsIForeignLibrary::INT64:
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aResult.mFFIType = ffi_type_sint64;
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break;
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case nsIForeignLibrary::BOOL:
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case nsIForeignLibrary::UINT8:
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aResult.mFFIType = ffi_type_uint8;
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break;
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case nsIForeignLibrary::UINT16:
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aResult.mFFIType = ffi_type_uint16;
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break;
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case nsIForeignLibrary::UINT32:
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aResult.mFFIType = ffi_type_uint32;
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break;
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case nsIForeignLibrary::UINT64:
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aResult.mFFIType = ffi_type_uint64;
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break;
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case nsIForeignLibrary::FLOAT:
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aResult.mFFIType = ffi_type_float;
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break;
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case nsIForeignLibrary::DOUBLE:
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aResult.mFFIType = ffi_type_double;
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break;
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case nsIForeignLibrary::STRING:
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case nsIForeignLibrary::USTRING:
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aResult.mFFIType = ffi_type_pointer;
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break;
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default:
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JS_ReportError(aContext, "Invalid type specification");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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aResult.mType = type;
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return NS_OK;
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}
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static nsresult
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PrepareValue(JSContext* aContext, const Type& aType, jsval aValue, Value& aResult)
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{
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jsdouble d;
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switch (aType.mType) {
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case nsIForeignLibrary::BOOL:
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// Do not implicitly lose bits, but allow the values 0, 1, and -0.
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// Programs can convert explicitly, if needed, using `Boolean(v)` or `!!v`.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mUint8) ||
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aResult.mValue.mUint8 > 1)
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return TypeError(aContext, "Expected boolean value");
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aResult.mData = &aResult.mValue.mUint8;
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break;
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case nsIForeignLibrary::INT8:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mInt8))
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return TypeError(aContext, "Expected int8 value");
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aResult.mData = &aResult.mValue.mInt8;
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break;
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case nsIForeignLibrary::INT16:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mInt16))
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return TypeError(aContext, "Expected int16 value");
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aResult.mData = &aResult.mValue.mInt16;
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break;
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case nsIForeignLibrary::INT32:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mInt32))
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return TypeError(aContext, "Expected int32 value");
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aResult.mData = &aResult.mValue.mInt32;
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case nsIForeignLibrary::INT64:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mInt64))
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return TypeError(aContext, "Expected int64 value");
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aResult.mData = &aResult.mValue.mInt64;
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break;
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case nsIForeignLibrary::UINT8:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mUint8))
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return TypeError(aContext, "Expected uint8 value");
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aResult.mData = &aResult.mValue.mUint8;
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break;
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case nsIForeignLibrary::UINT16:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mUint16))
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return TypeError(aContext, "Expected uint16 value");
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aResult.mData = &aResult.mValue.mUint16;
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break;
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case nsIForeignLibrary::UINT32:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mUint32))
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return TypeError(aContext, "Expected uint32 value");
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aResult.mData = &aResult.mValue.mUint32;
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case nsIForeignLibrary::UINT64:
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// Do not implicitly lose bits.
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if (!jsvalToIntStrict(aValue, &aResult.mValue.mUint64))
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return TypeError(aContext, "Expected uint64 value");
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aResult.mData = &aResult.mValue.mUint64;
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break;
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case nsIForeignLibrary::FLOAT:
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if (!jsvalToDoubleStrict(aValue, &d))
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return TypeError(aContext, "Expected number");
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// The following cast silently throws away some bits, but there's
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// no good way around it. Sternly requiring that the 64-bit double
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// argument be exactly representable as a 32-bit float is
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// unrealistic: it would allow 1/2 to pass but not 1/3.
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aResult.mValue.mFloat = float(d);
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aResult.mData = &aResult.mValue.mFloat;
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break;
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case nsIForeignLibrary::DOUBLE:
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if (!jsvalToDoubleStrict(aValue, &d))
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return TypeError(aContext, "Expected number");
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aResult.mValue.mDouble = d;
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aResult.mData = &aResult.mValue.mDouble;
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break;
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case nsIForeignLibrary::STRING:
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if (JSVAL_IS_NULL(aValue)) {
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// Allow passing a null pointer.
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aResult.mValue.mPointer = nsnull;
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} else if (JSVAL_IS_STRING(aValue)) {
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aResult.mValue.mPointer = JS_GetStringBytes(JSVAL_TO_STRING(aValue));
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} else {
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// Don't implicitly convert to string. Users can implicitly convert
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// with `String(x)` or `""+x`.
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return TypeError(aContext, "Expected string");
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}
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aResult.mData = &aResult.mValue.mPointer;
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break;
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case nsIForeignLibrary::USTRING:
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if (JSVAL_IS_NULL(aValue)) {
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// Allow passing a null pointer.
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aResult.mValue.mPointer = nsnull;
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} else if (JSVAL_IS_STRING(aValue)) {
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aResult.mValue.mPointer = JS_GetStringChars(JSVAL_TO_STRING(aValue));
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} else {
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// Don't implicitly convert to string. Users can implicitly convert
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// with `String(x)` or `""+x`.
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return TypeError(aContext, "Expected string");
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}
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aResult.mData = &aResult.mValue.mPointer;
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break;
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default:
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NS_NOTREACHED("invalid type");
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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static void
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PrepareReturnValue(const Type& aType, Value& aResult)
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{
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switch (aType.mType) {
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case nsIForeignLibrary::VOID:
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aResult.mData = nsnull;
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break;
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case nsIForeignLibrary::INT8:
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aResult.mData = &aResult.mValue.mInt8;
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break;
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case nsIForeignLibrary::INT16:
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aResult.mData = &aResult.mValue.mInt16;
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break;
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case nsIForeignLibrary::INT32:
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aResult.mData = &aResult.mValue.mInt32;
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break;
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case nsIForeignLibrary::INT64:
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aResult.mData = &aResult.mValue.mInt64;
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break;
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case nsIForeignLibrary::BOOL:
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case nsIForeignLibrary::UINT8:
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aResult.mData = &aResult.mValue.mUint8;
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break;
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case nsIForeignLibrary::UINT16:
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aResult.mData = &aResult.mValue.mUint16;
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break;
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case nsIForeignLibrary::UINT32:
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aResult.mData = &aResult.mValue.mUint32;
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break;
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case nsIForeignLibrary::UINT64:
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aResult.mData = &aResult.mValue.mUint64;
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break;
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case nsIForeignLibrary::FLOAT:
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aResult.mData = &aResult.mValue.mFloat;
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break;
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case nsIForeignLibrary::DOUBLE:
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aResult.mData = &aResult.mValue.mDouble;
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break;
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case nsIForeignLibrary::STRING:
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case nsIForeignLibrary::USTRING:
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aResult.mData = &aResult.mValue.mPointer;
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break;
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default:
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NS_NOTREACHED("invalid type");
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break;
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}
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}
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static nsresult
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ConvertReturnValue(JSContext* aContext,
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const Type& aResultType,
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const Value& aResultValue,
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jsval* aValue)
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{
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switch (aResultType.mType) {
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case nsIForeignLibrary::VOID:
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*aValue = JSVAL_VOID;
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break;
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case nsIForeignLibrary::BOOL:
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*aValue = aResultValue.mValue.mUint8 ? JSVAL_TRUE : JSVAL_FALSE;
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break;
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case nsIForeignLibrary::INT8:
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*aValue = INT_TO_JSVAL(aResultValue.mValue.mInt8);
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break;
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case nsIForeignLibrary::INT16:
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*aValue = INT_TO_JSVAL(aResultValue.mValue.mInt16);
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break;
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case nsIForeignLibrary::INT32:
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mInt32), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::INT64:
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// Implicit conversion with loss of bits. :-[
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mInt64), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::UINT8:
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*aValue = INT_TO_JSVAL(aResultValue.mValue.mUint8);
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break;
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case nsIForeignLibrary::UINT16:
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*aValue = INT_TO_JSVAL(aResultValue.mValue.mUint16);
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break;
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case nsIForeignLibrary::UINT32:
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mUint32), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::UINT64:
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// Implicit conversion with loss of bits. :-[
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mUint64), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::FLOAT:
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mFloat), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::DOUBLE:
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if (!JS_NewNumberValue(aContext, jsdouble(aResultValue.mValue.mDouble), aValue))
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return NS_ERROR_OUT_OF_MEMORY;
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break;
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case nsIForeignLibrary::STRING: {
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if (!aResultValue.mValue.mPointer) {
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// Allow returning a null pointer.
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*aValue = JSVAL_NULL;
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} else {
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JSString *jsstring = JS_NewStringCopyZ(aContext,
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reinterpret_cast<const char*>(aResultValue.mValue.mPointer));
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if (!jsstring)
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return NS_ERROR_OUT_OF_MEMORY;
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*aValue = STRING_TO_JSVAL(jsstring);
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}
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break;
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}
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case nsIForeignLibrary::USTRING: {
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if (!aResultValue.mValue.mPointer) {
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// Allow returning a null pointer.
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*aValue = JSVAL_NULL;
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} else {
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JSString *jsstring = JS_NewUCStringCopyZ(aContext,
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reinterpret_cast<const jschar*>(aResultValue.mValue.mPointer));
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if (!jsstring)
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return NS_ERROR_OUT_OF_MEMORY;
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*aValue = STRING_TO_JSVAL(jsstring);
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}
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break;
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}
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default:
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NS_NOTREACHED("invalid type");
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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/*******************************************************************************
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** Function
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*******************************************************************************/
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NS_IMPL_ISUPPORTS1(Function, nsIXPCScriptable)
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Function::Function()
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: mFunc(nsnull)
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{
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}
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Function::~Function()
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{
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}
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nsresult
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Function::Init(JSContext* aContext,
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Library* aLibrary,
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PRFuncPtr aFunc,
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PRUint16 aCallType,
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jsval aResultType,
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const nsTArray<jsval>& aArgTypes)
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{
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nsresult rv;
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mLibrary = aLibrary;
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mFunc = aFunc;
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// determine the ABI
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rv = GetABI(aCallType, mCallType);
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if (NS_FAILED(rv)) {
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JS_ReportError(aContext, "Invalid ABI specification");
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return rv;
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}
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// prepare the result type
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rv = PrepareType(aContext, aResultType, mResultType);
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NS_ENSURE_SUCCESS(rv, rv);
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// prepare the argument types
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for (PRUint32 i = 0; i < aArgTypes.Length(); ++i) {
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rv = PrepareType(aContext, aArgTypes[i], *mArgTypes.AppendElement());
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NS_ENSURE_SUCCESS(rv, rv);
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// disallow void argument types
|
|
if (mArgTypes[i].mType == nsIForeignLibrary::VOID)
|
|
return TypeError(aContext, "Cannot have void argument type");
|
|
|
|
// ffi_prep_cif requires an array of ffi_types; prepare it separately.
|
|
mFFITypes.AppendElement(&mArgTypes[i].mFFIType);
|
|
}
|
|
|
|
ffi_status status = ffi_prep_cif(&mCIF, mCallType, mFFITypes.Length(),
|
|
&mResultType.mFFIType, mFFITypes.Elements());
|
|
switch (status) {
|
|
case FFI_OK:
|
|
return NS_OK;
|
|
case FFI_BAD_ABI:
|
|
JS_ReportError(aContext, "Invalid ABI specification");
|
|
return NS_ERROR_INVALID_ARG;
|
|
case FFI_BAD_TYPEDEF:
|
|
JS_ReportError(aContext, "Invalid type specification");
|
|
return NS_ERROR_INVALID_ARG;
|
|
default:
|
|
JS_ReportError(aContext, "Unknown libffi error");
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
Function::Execute(JSContext* aContext, PRUint32 aArgc, jsval* aArgv, jsval* aValue)
|
|
{
|
|
nsresult rv;
|
|
|
|
// prepare the values for each argument
|
|
nsAutoTArray<Value, 16> values;
|
|
for (PRUint32 i = 0; i < mArgTypes.Length(); ++i) {
|
|
rv = PrepareValue(aContext, mArgTypes[i], aArgv[i], *values.AppendElement());
|
|
if (NS_FAILED(rv)) return PR_FALSE;
|
|
}
|
|
|
|
// create an array of pointers to each value, for passing to ffi_call
|
|
nsAutoTArray<void*, 16> ffiValues;
|
|
for (PRUint32 i = 0; i < mArgTypes.Length(); ++i) {
|
|
ffiValues.AppendElement(values[i].mData);
|
|
}
|
|
|
|
// initialize a pointer to an appropriate location, for storing the result
|
|
Value resultValue;
|
|
PrepareReturnValue(mResultType, resultValue);
|
|
|
|
// suspend the request before we call into the function, since the call
|
|
// may block or otherwise take a long time to return.
|
|
jsrefcount rc = JS_SuspendRequest(aContext);
|
|
|
|
ffi_call(&mCIF, mFunc, resultValue.mData, ffiValues.Elements());
|
|
|
|
JS_ResumeRequest(aContext, rc);
|
|
|
|
// prepare a JS object from the result
|
|
rv = ConvertReturnValue(aContext, mResultType, resultValue, aValue);
|
|
if (NS_FAILED(rv)) return PR_FALSE;
|
|
|
|
return PR_TRUE;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
** nsIXPCScriptable implementation
|
|
*******************************************************************************/
|
|
|
|
#define XPC_MAP_CLASSNAME Function
|
|
#define XPC_MAP_QUOTED_CLASSNAME "Function"
|
|
#define XPC_MAP_WANT_CALL
|
|
#define XPC_MAP_FLAGS nsIXPCScriptable::WANT_CALL
|
|
|
|
#include "xpc_map_end.h"
|
|
|
|
NS_IMETHODIMP
|
|
Function::Call(nsIXPConnectWrappedNative* wrapper,
|
|
JSContext* cx,
|
|
JSObject* obj,
|
|
PRUint32 argc,
|
|
jsval* argv,
|
|
jsval* vp,
|
|
PRBool* _retval)
|
|
{
|
|
if (!mLibrary->IsOpen()) {
|
|
JS_ReportError(cx, "Library is not open");
|
|
*_retval = PR_FALSE;
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
if (argc != mArgTypes.Length()) {
|
|
JS_ReportError(cx, "Number of arguments does not match declaration");
|
|
*_retval = PR_FALSE;
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
|
|
*_retval = Execute(cx, argc, argv, vp);
|
|
if (!*_retval)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
}
|
|
}
|
|
|