Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS)
: _klass(klass),
_pool(cpool),
_methods(methods)
{
assert(_pool->cache() == NULL, "constant pool cache must not be set yet");
// determine index maps for methodOop rewriting
compute_index_maps();
if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
bool did_rewrite = false;
int i = _methods->length();
while (i-- > 0) {
methodOop method = (methodOop)_methods->obj_at(i);
if (method->intrinsic_id() == vmIntrinsics::_Object_init) {
// rewrite the return bytecodes of Object.<init> to register the
// object for finalization if needed.
methodHandle m(THREAD, method);
rewrite_Object_init(m, CHECK);
did_rewrite = true;
break;
}
}
assert(did_rewrite, "must find Object::<init> to rewrite it");
}
// rewrite methods, in two passes
int i, len = _methods->length();
for (i = len; --i >= 0; ) {
methodOop method = (methodOop)_methods->obj_at(i);
scan_method(method);
}
// allocate constant pool cache, now that we've seen all the bytecodes
make_constant_pool_cache(CHECK);
for (i = len; --i >= 0; ) {
methodHandle m(THREAD, (methodOop)_methods->obj_at(i));
if (m->has_jsrs()) {
m = rewrite_jsrs(m, CHECK);
// Method might have gotten rewritten.
_methods->obj_at_put(i, m());
}
// Set up method entry points for compiler and interpreter.
m->link_method(m, CHECK);
}
}
Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS)
: _klass(klass),
_pool(cpool),
_methods(methods)
{
assert(_pool->cache() == NULL, "constant pool cache must not be set yet");
// determine index maps for methodOop rewriting
compute_index_maps();
if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
bool did_rewrite = false;
int i = _methods->length();
while (i-- > 0) {
methodOop method = (methodOop)_methods->obj_at(i);
if (method->intrinsic_id() == vmIntrinsics::_Object_init) {
// rewrite the return bytecodes of Object.<init> to register the
// object for finalization if needed.
methodHandle m(THREAD, method);
rewrite_Object_init(m, CHECK);
did_rewrite = true;
break;
}
}
assert(did_rewrite, "must find Object::<init> to rewrite it");
}
// rewrite methods, in two passes
int len = _methods->length();
for (int i = len-1; i >= 0; i--) {
methodOop method = (methodOop)_methods->obj_at(i);
scan_method(method);
}
// allocate constant pool cache, now that we've seen all the bytecodes
make_constant_pool_cache(THREAD);
// Restore bytecodes to their unrewritten state if there are exceptions
// rewriting bytecodes or allocating the cpCache
if (HAS_PENDING_EXCEPTION) {
restore_bytecodes();
return;
}
}