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/* wrapper.c - IcePick tools wrapper
Copyright (C) 2008 Andrew John Hughes
This file is part of IcePick.
IcePick is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
IcePick is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with IcePick; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
#include "wrapper.h"
#ifdef USE_JNI
int invoke_via_jni(char** vm_options, int vm_count,
char** main_options, int main_count)
{
JNIEnv *env;
JavaVM *vm;
JavaVMInitArgs vm_args;
JavaVMOption options[vm_count];
jint res;
jclass cls;
jmethodID main_method;
jclass string_class;
jobjectArray args;
int a;
for (a = 0; a < vm_count; ++a)
options[a].optionString = *vm_options++;
#ifdef DEBUG
for (a = 0; a < vm_count; ++a)
printf("vm option %d: %s\n", a, options[a].optionString);
#endif
vm_args.version = JNI_VERSION_1_2;
vm_args.ignoreUnrecognized = JNI_TRUE;
vm_args.options = options;
vm_args.nOptions = vm_count;
res = JNI_CreateJavaVM(&vm, (void**)&env, &vm_args);
if (res < 0)
{
fprintf(stderr, "Couldn't create Java VM\n");
exit(-1);
}
cls = (*env)->FindClass(env, "CLASS_NAME");
if (cls == NULL) {
goto destroy;
}
main_method = (*env)->GetStaticMethodID(env, cls, "main",
"([Ljava/lang/String;)V");
if (main_method == NULL) {
goto destroy;
}
string_class = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, main_count, string_class, NULL);
if (args == NULL) {
goto destroy;
}
for (a = 0; a < main_count; ++a)
{
jstring jstr;
jstr = (*env)->NewStringUTF(env, *argv);
if (jstr == NULL)
goto destroy;
++argv;
(*env)->SetObjectArrayElement(env, args, a, jstr);
}
(*env)->CallStaticVoidMethod(env, cls, main_method, args);
destroy:
if ((*env)->ExceptionOccurred(env))
(*env)->ExceptionDescribe(env);
return (*vm)->DestroyJavaVM(vm);
}
#endif
int invoke_via_exec(char** vm_options, int vm_count,
char** main_options, int main_count)
{
char* argv[vm_count + main_count + 5];
char** argv_pos;
int a;
argv_pos = argv;
*argv_pos++ = (char*) VM_BINARY;
*argv_pos++ = (char*) "-classpath";
*argv_pos++ = (char*) TOOLS_CP;
for (a = 0; a < vm_count; ++a)
*argv_pos++ = *vm_options++;
*argv_pos++ = (char*) MAIN_METHOD;
for (a = 0; a < main_count; ++a)
*argv_pos++ = *main_options++;
#ifdef DEBUG
for (a = 0; a < vm_count + main_count + 4; ++a)
printf("cmd line option %d: %s\n", a, argv[a]);
#endif
*argv_pos++ = NULL;
int res = execvp(VM_BINARY, argv);
if (res)
perror("Error invoking VM");
return res;
}
int main(int argc, char** argv)
{
char** read_pos;
char** write_pos;
int a;
int vm_count = 0;
int main_count = 0;
char* vm_opt[argc-1];
read_pos = argv + 1;
write_pos = argv;
for (a = 0; a < argc - 1; ++a)
{
if (strncmp(*read_pos, "-J", (size_t)2) == 0)
{
vm_opt[vm_count] = *read_pos + 2;
++vm_count;
}
else
{
*write_pos = *read_pos;
++write_pos;
++main_count;
}
++read_pos;
}
#ifdef DEBUG
for (a = 0; a < main_count; ++a)
printf("main option %d: %s\n", a, *argv++);
for (a = 0; a < vm_count; ++a)
printf("vm option %d: %s\n", a, vm_opt[a]);
#endif
#ifdef USE_JNI
return invoke_via_jni(vm_opt, vm_count, argv, main_count);
#else
return invoke_via_exec(vm_opt, vm_count, argv, main_count);
#endif
}
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