The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 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 | * Command-line invocation of the Dalvik VM. |
| 18 | */ |
| 19 | #include "jni.h" |
| 20 | |
| 21 | #include <stdlib.h> |
| 22 | #include <stdio.h> |
| 23 | #include <string.h> |
| 24 | #include <signal.h> |
| 25 | #include <assert.h> |
| 26 | |
| 27 | |
| 28 | /* |
| 29 | * We want failed write() calls to just return with an error. |
| 30 | */ |
| 31 | static void blockSigpipe() |
| 32 | { |
| 33 | sigset_t mask; |
| 34 | |
| 35 | sigemptyset(&mask); |
| 36 | sigaddset(&mask, SIGPIPE); |
| 37 | if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0) |
| 38 | fprintf(stderr, "WARNING: SIGPIPE not blocked\n"); |
| 39 | } |
| 40 | |
| 41 | /* |
| 42 | * Create a String[] and populate it with the contents of argv. |
| 43 | */ |
| 44 | static jobjectArray createStringArray(JNIEnv* env, char* const argv[], int argc) |
| 45 | { |
| 46 | jclass stringClass = NULL; |
| 47 | jobjectArray strArray = NULL; |
| 48 | jobjectArray result = NULL; |
| 49 | int i; |
| 50 | |
| 51 | stringClass = (*env)->FindClass(env, "java/lang/String"); |
| 52 | if ((*env)->ExceptionCheck(env)) { |
| 53 | fprintf(stderr, "Got exception while finding class String\n"); |
| 54 | goto bail; |
| 55 | } |
| 56 | assert(stringClass != NULL); |
| 57 | strArray = (*env)->NewObjectArray(env, argc, stringClass, NULL); |
| 58 | if ((*env)->ExceptionCheck(env)) { |
| 59 | fprintf(stderr, "Got exception while creating String array\n"); |
| 60 | goto bail; |
| 61 | } |
| 62 | assert(strArray != NULL); |
| 63 | |
| 64 | for (i = 0; i < argc; i++) { |
| 65 | jstring argStr; |
| 66 | |
| 67 | argStr = (*env)->NewStringUTF(env, argv[i]); |
| 68 | if ((*env)->ExceptionCheck(env)) { |
| 69 | fprintf(stderr, "Got exception while allocating Strings\n"); |
| 70 | goto bail; |
| 71 | } |
| 72 | assert(argStr != NULL); |
| 73 | (*env)->SetObjectArrayElement(env, strArray, i, argStr); |
| 74 | (*env)->DeleteLocalRef(env, argStr); |
| 75 | } |
| 76 | |
| 77 | /* return the array, and ensure we don't delete the local ref to it */ |
| 78 | result = strArray; |
| 79 | strArray = NULL; |
| 80 | |
| 81 | bail: |
| 82 | (*env)->DeleteLocalRef(env, stringClass); |
| 83 | (*env)->DeleteLocalRef(env, strArray); |
| 84 | return result; |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Determine whether or not the specified method is public. |
| 89 | * |
| 90 | * Returns JNI_TRUE on success, JNI_FALSE on failure. |
| 91 | */ |
| 92 | static int methodIsPublic(JNIEnv* env, jclass clazz, jmethodID methodId) |
| 93 | { |
| 94 | static const int PUBLIC = 0x0001; // java.lang.reflect.Modifiers.PUBLIC |
| 95 | jobject refMethod = NULL; |
| 96 | jclass methodClass = NULL; |
| 97 | jmethodID getModifiersId; |
| 98 | int modifiers; |
| 99 | int result = JNI_FALSE; |
| 100 | |
| 101 | refMethod = (*env)->ToReflectedMethod(env, clazz, methodId, JNI_FALSE); |
| 102 | if (refMethod == NULL) { |
| 103 | fprintf(stderr, "Dalvik VM unable to get reflected method\n"); |
| 104 | goto bail; |
| 105 | } |
| 106 | |
| 107 | /* |
| 108 | * We now have a Method instance. We need to call |
| 109 | * its getModifiers() method. |
| 110 | */ |
| 111 | methodClass = (*env)->FindClass(env, "java/lang/reflect/Method"); |
| 112 | if (methodClass == NULL) { |
| 113 | fprintf(stderr, "Dalvik VM unable to find class Method\n"); |
| 114 | goto bail; |
| 115 | } |
| 116 | getModifiersId = (*env)->GetMethodID(env, methodClass, |
| 117 | "getModifiers", "()I"); |
The Android Open Source Project | 9940988 | 2009-03-18 22:20:24 -0700 | [diff] [blame] | 118 | if (getModifiersId == NULL) { |
The Android Open Source Project | f6c3871 | 2009-03-03 19:28:47 -0800 | [diff] [blame] | 119 | fprintf(stderr, "Dalvik VM unable to find reflect.Method.getModifiers\n"); |
| 120 | goto bail; |
| 121 | } |
| 122 | |
| 123 | modifiers = (*env)->CallIntMethod(env, refMethod, getModifiersId); |
| 124 | if ((modifiers & PUBLIC) == 0) { |
| 125 | fprintf(stderr, "Dalvik VM: main() is not public\n"); |
| 126 | goto bail; |
| 127 | } |
| 128 | |
| 129 | result = JNI_TRUE; |
| 130 | |
| 131 | bail: |
| 132 | (*env)->DeleteLocalRef(env, refMethod); |
| 133 | (*env)->DeleteLocalRef(env, methodClass); |
| 134 | return result; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Parse arguments. Most of it just gets passed through to the VM. The |
| 139 | * JNI spec defines a handful of standard arguments. |
| 140 | */ |
| 141 | int main(int argc, char* const argv[]) |
| 142 | { |
| 143 | JavaVM* vm = NULL; |
| 144 | JNIEnv* env = NULL; |
| 145 | JavaVMInitArgs initArgs; |
| 146 | JavaVMOption* options = NULL; |
| 147 | char* slashClass = NULL; |
| 148 | int optionCount, curOpt, i, argIdx; |
| 149 | int needExtra = JNI_FALSE; |
| 150 | int result = 1; |
| 151 | |
| 152 | setvbuf(stdout, NULL, _IONBF, 0); |
| 153 | |
| 154 | /* ignore argv[0] */ |
| 155 | argv++; |
| 156 | argc--; |
| 157 | |
| 158 | /* |
| 159 | * If we're adding any additional stuff, e.g. function hook specifiers, |
| 160 | * add them to the count here. |
| 161 | * |
| 162 | * We're over-allocating, because this includes the options to the VM |
| 163 | * plus the options to the program. |
| 164 | */ |
| 165 | optionCount = argc; |
| 166 | |
| 167 | options = (JavaVMOption*) malloc(sizeof(JavaVMOption) * optionCount); |
| 168 | memset(options, 0, sizeof(JavaVMOption) * optionCount); |
| 169 | |
| 170 | /* |
| 171 | * Copy options over. Everything up to the name of the class starts |
| 172 | * with a '-' (the function hook stuff is strictly internal). |
| 173 | * |
| 174 | * [Do we need to catch & handle "-jar" here?] |
| 175 | */ |
| 176 | for (curOpt = argIdx = 0; argIdx < argc; argIdx++) { |
| 177 | if (argv[argIdx][0] != '-' && !needExtra) |
| 178 | break; |
| 179 | options[curOpt++].optionString = strdup(argv[argIdx]); |
| 180 | |
| 181 | /* some options require an additional arg */ |
| 182 | needExtra = JNI_FALSE; |
| 183 | if (strcmp(argv[argIdx], "-classpath") == 0 || |
| 184 | strcmp(argv[argIdx], "-cp") == 0) |
| 185 | /* others? */ |
| 186 | { |
| 187 | needExtra = JNI_TRUE; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | if (needExtra) { |
| 192 | fprintf(stderr, "Dalvik VM requires value after last option flag\n"); |
| 193 | goto bail; |
| 194 | } |
| 195 | |
| 196 | /* insert additional internal options here */ |
| 197 | |
| 198 | assert(curOpt <= optionCount); |
| 199 | |
| 200 | initArgs.version = JNI_VERSION_1_4; |
| 201 | initArgs.options = options; |
| 202 | initArgs.nOptions = curOpt; |
| 203 | initArgs.ignoreUnrecognized = JNI_FALSE; |
| 204 | |
| 205 | //printf("nOptions = %d\n", initArgs.nOptions); |
| 206 | |
| 207 | blockSigpipe(); |
| 208 | |
| 209 | /* |
| 210 | * Start VM. The current thread becomes the main thread of the VM. |
| 211 | */ |
| 212 | if (JNI_CreateJavaVM(&vm, &env, &initArgs) < 0) { |
| 213 | fprintf(stderr, "Dalvik VM init failed (check log file)\n"); |
| 214 | goto bail; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Make sure they provided a class name. We do this after VM init |
| 219 | * so that things like "-Xrunjdwp:help" have the opportunity to emit |
| 220 | * a usage statement. |
| 221 | */ |
| 222 | if (argIdx == argc) { |
| 223 | fprintf(stderr, "Dalvik VM requires a class name\n"); |
| 224 | goto bail; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * We want to call main() with a String array with our arguments in it. |
| 229 | * Create an array and populate it. Note argv[0] is not included. |
| 230 | */ |
| 231 | jobjectArray strArray; |
| 232 | strArray = createStringArray(env, &argv[argIdx+1], argc-argIdx-1); |
| 233 | if (strArray == NULL) |
| 234 | goto bail; |
| 235 | |
| 236 | /* |
| 237 | * Find [class].main(String[]). |
| 238 | */ |
| 239 | jclass startClass; |
| 240 | jmethodID startMeth; |
| 241 | char* cp; |
| 242 | |
| 243 | /* convert "com.android.Blah" to "com/android/Blah" */ |
| 244 | slashClass = strdup(argv[argIdx]); |
| 245 | for (cp = slashClass; *cp != '\0'; cp++) |
| 246 | if (*cp == '.') |
| 247 | *cp = '/'; |
| 248 | |
| 249 | startClass = (*env)->FindClass(env, slashClass); |
| 250 | if (startClass == NULL) { |
| 251 | fprintf(stderr, "Dalvik VM unable to locate class '%s'\n", slashClass); |
| 252 | goto bail; |
| 253 | } |
| 254 | |
| 255 | startMeth = (*env)->GetStaticMethodID(env, startClass, |
| 256 | "main", "([Ljava/lang/String;)V"); |
| 257 | if (startMeth == NULL) { |
| 258 | fprintf(stderr, "Dalvik VM unable to find static main(String[]) in '%s'\n", |
| 259 | slashClass); |
| 260 | goto bail; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Make sure the method is public. JNI doesn't prevent us from calling |
| 265 | * a private method, so we have to check it explicitly. |
| 266 | */ |
| 267 | if (!methodIsPublic(env, startClass, startMeth)) |
| 268 | goto bail; |
| 269 | |
| 270 | /* |
| 271 | * Invoke main(). |
| 272 | */ |
| 273 | (*env)->CallStaticVoidMethod(env, startClass, startMeth, strArray); |
| 274 | |
| 275 | if (!(*env)->ExceptionCheck(env)) |
| 276 | result = 0; |
| 277 | |
| 278 | bail: |
| 279 | /*printf("Shutting down Dalvik VM\n");*/ |
| 280 | if (vm != NULL) { |
| 281 | /* |
| 282 | * This allows join() and isAlive() on the main thread to work |
| 283 | * correctly, and also provides uncaught exception handling. |
| 284 | */ |
| 285 | if ((*vm)->DetachCurrentThread(vm) != JNI_OK) { |
| 286 | fprintf(stderr, "Warning: unable to detach main thread\n"); |
| 287 | result = 1; |
| 288 | } |
| 289 | |
| 290 | if ((*vm)->DestroyJavaVM(vm) != 0) |
| 291 | fprintf(stderr, "Warning: Dalvik VM did not shut down cleanly\n"); |
| 292 | /*printf("\nDalvik VM has exited\n");*/ |
| 293 | } |
| 294 | |
| 295 | for (i = 0; i < optionCount; i++) |
| 296 | free((char*) options[i].optionString); |
| 297 | free(options); |
| 298 | free(slashClass); |
| 299 | /*printf("--- VM is down, process exiting\n");*/ |
| 300 | return result; |
| 301 | } |