262 // Load object from cpool->resolved_references(index)
263 void InterpreterMacroAssembler::load_resolved_reference_at_index(
264 Register result, Register index) {
265 assert_different_registers(result, index);
266 // convert from field index to resolved_references() index and from
267 // word index to byte offset. Since this is a java object, it can be compressed
268 Register tmp = index; // reuse
269 lslw(tmp, tmp, LogBytesPerHeapOop);
270
271 get_constant_pool(result);
272 // load pointer for resolved_references[] objArray
273 ldr(result, Address(result, ConstantPool::cache_offset_in_bytes()));
274 ldr(result, Address(result, ConstantPoolCache::resolved_references_offset_in_bytes()));
275 // JNIHandles::resolve(obj);
276 ldr(result, Address(result, 0));
277 // Add in the index
278 add(result, result, tmp);
279 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
280 }
281
282 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
283 // subtype of super_klass.
284 //
285 // Args:
286 // r0: superklass
287 // Rsub_klass: subklass
288 //
289 // Kills:
290 // r2, r5
291 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
292 Label& ok_is_subtype) {
293 assert(Rsub_klass != r0, "r0 holds superklass");
294 assert(Rsub_klass != r2, "r2 holds 2ndary super array length");
295 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr");
296
297 // Profile the not-null value's klass.
298 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5
299
300 // Do the check.
301 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2
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262 // Load object from cpool->resolved_references(index)
263 void InterpreterMacroAssembler::load_resolved_reference_at_index(
264 Register result, Register index) {
265 assert_different_registers(result, index);
266 // convert from field index to resolved_references() index and from
267 // word index to byte offset. Since this is a java object, it can be compressed
268 Register tmp = index; // reuse
269 lslw(tmp, tmp, LogBytesPerHeapOop);
270
271 get_constant_pool(result);
272 // load pointer for resolved_references[] objArray
273 ldr(result, Address(result, ConstantPool::cache_offset_in_bytes()));
274 ldr(result, Address(result, ConstantPoolCache::resolved_references_offset_in_bytes()));
275 // JNIHandles::resolve(obj);
276 ldr(result, Address(result, 0));
277 // Add in the index
278 add(result, result, tmp);
279 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
280 }
281
282 void InterpreterMacroAssembler::load_resolved_klass_at_offset(
283 Register cpool, Register index, Register klass, Register temp) {
284 add(temp, cpool, index, LSL, LogBytesPerWord);
285 ldrh(temp, Address(temp, sizeof(ConstantPool))); // temp = resolved_klass_index
286 ldr(klass, Address(cpool, ConstantPool::resolved_klasses_offset_in_bytes())); // klass = cpool->_resolved_klasses
287 add(klass, klass, temp, LSL, LogBytesPerWord);
288 ldr(klass, Address(klass, Array<Klass*>::base_offset_in_bytes()));
289 }
290
291 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a
292 // subtype of super_klass.
293 //
294 // Args:
295 // r0: superklass
296 // Rsub_klass: subklass
297 //
298 // Kills:
299 // r2, r5
300 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
301 Label& ok_is_subtype) {
302 assert(Rsub_klass != r0, "r0 holds superklass");
303 assert(Rsub_klass != r2, "r2 holds 2ndary super array length");
304 assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr");
305
306 // Profile the not-null value's klass.
307 profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5
308
309 // Do the check.
310 check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2
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