1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 /* 17 * Target-specific optimization and run-time hints 18 */ 19 20 21 #include "Dalvik.h" 22 #include "libdex/DexClass.h" 23 24 #include <stdlib.h> 25 #include <stddef.h> 26 #include <sys/stat.h> 27 28 29 /* 30 * The class loader will associate with each method a 32-bit info word 31 * (jniArgInfo) to support JNI calls. The high order 4 bits of this word 32 * are the same for all targets, while the lower 28 are used for hints to 33 * allow accelerated JNI bridge transfers. 34 * 35 * jniArgInfo (32-bit int) layout: 36 * 37 * SRRRHHHH HHHHHHHH HHHHHHHH HHHHHHHH 38 * 39 * S - if set, ignore the hints and do things the hard way (scan signature) 40 * R - return-type enumeration 41 * H - target-specific hints 42 * 43 * This function is a placeholder/template and should be duplicated in the 44 * appropriate arch/<target>/ directory for new target ports. The hints 45 * field should be defined and constructed in conjunction with 46 * dvmPlatformInvoke. 47 48 * If valid hints can't be constructed, this function should return a negative 49 * value. In that case, the caller will set the S bit in the jniArgInfo word 50 * and convert the arguments the slow way. 51 */ 52 u4 dvmPlatformInvokeHints( const DexProto* proto) 53 { 54 /* No hints for generic target - force argument walk at run-time */ 55 return DALVIK_JNI_NO_ARG_INFO; 56 } 57
