Does -fjni work with recent builds?
Barnet Wagman
wagman@enteract.com
Sat Jan 20 09:56:00 GMT 2001
===================================================================
 RCS file: /cvs/gcc/egcs/gcc/java/expr.c,v
 retrieving revision 1.96
 diff -u -p -r1.96 expr.c
 --- expr.c     2001年01月17日 00:39:09    1.96
 +++ expr.c     2001年01月20日 02:26:45
 @@ -2024,6 +2024,7 @@ build_jni_stub (method)
    TREE_STATIC (meth_var) = 1;
    TREE_PUBLIC (meth_var) = 0;
    DECL_EXTERNAL (meth_var) = 0;
 + DECL_CONTEXT (meth_var) = method;
    make_decl_rtl (meth_var, NULL);
    meth_var = pushdecl_top_level (meth_var);
Yes, this solves the compilation problem.
There may still be a package name problem. The following combination
of java and c works:
// package A;
public class JniTest {
   public native void jnitestc();
   public static native void jnistaticfn();
   static {
       System.loadLibrary("jnitest");
       jnistaticfn();
   }
   public JniTest() {
     System.err.println("Hello world,
from JniTest constructor.");
   }
   public static void main(String[] argv) {
       new JniTest();
   }
}
#include <stdio.h>
#include <jni.h>
ÂÂ
/* extern void JNICALL Java_A_JniTest_jnitestc(JNIEnv *env,jobject
jo) { *
extern void JNICALL Java_JniTest_jnitestc(JNIEnv *env,jobject jo)
{
 printf("Hello world, from jnitestc.\n");
}
/* extern void JNICALL Java_A_JniTest_jnistaticfn(JNIEnv *env,jclass
jc)) { */
extern void JNICALL Java_JniTest_jnistaticfn(JNIEnv *env,jclass
jc)) {
   printf("Hello world, from jnistaticfn.\n");
}
( The library was created with ld -shared -o libjnitest.so jnitestc.o )
However, if I use the package name A (see the commented
lines,above), on execution we get the following error:
Exception in thread "main" java.lang.AbstractMethodError: jnistaticfn
  at 0x4019b219: java::lang::Throwable::Throwable(java::lang::String*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x4018ec40: java::lang::Error::Error(java::lang::String*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x40190f60: java::lang::LinkageError::LinkageError(java::lang::String*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x4018fc20: java::lang::IncompatibleClassChangeError::IncompatibleClassChangeError(java::lang::String*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x40189d10: java::lang::AbstractMethodError::AbstractMethodError(java::lang::String*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x40162943: _Jv_LookupJNIMethod (/usr/local/gcc/lib/libgcj.so.1)
  at 0x0804b857: A::JniTest::jnistaticfn() (/home/moi/GCJ_JavaTree/A/JniTest.java:0)
  at 0x0804b8ec: _ZN1A7JniTest_003cclinit_003eEvU (/home/moi/GCJ_JavaTree/A/JniTest.java:0)
  at 0x40179b13: java::lang::Class::initializeClass()
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x40176a39: gnu::gcj::runtime::FirstThread::run()
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x40181acb: java::lang::Thread::run_(java::lang::Object*)
(/usr/local/gcc/lib/libgcj.so.1)
  at 0x402a2d5a: _Jv_ThreadStart(java::lang::Thread*,
int*, void (*)(java::lang::Thread*)) (/usr/local/gcc/lib/libgcj.so.1)
  at 0x40181bff: java::lang::Thread::start() (/usr/local/gcc/lib/libgcj.so.1)
  at 0x4015fea2: JvRunMain (/usr/local/gcc/lib/libgcj.so.1)
  at 0x0804b933: main (/tmp/ccjYla8Mmain.i:0)
  at 0x40476a5e: __libc_start_main (/lib/libc.so.6)
  at 0x080490d1: _start (??:0)
Note that this only occurs for the static method in the package.ÂÂ
Without the call to the static method, the package name is resolved correctly.
(Personally, I'd like to see change checked in even if the static reference
problem can't be resolved at the present.)
Thanks and regards,
Barnet
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