duke@435: /*
trims@1907:  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "asm/codeBuffer.hpp"
stefank@2314: #include "c1/c1_CodeStubs.hpp"
stefank@2314: #include "c1/c1_Defs.hpp"
stefank@2314: #include "c1/c1_FrameMap.hpp"
stefank@2314: #include "c1/c1_LIRAssembler.hpp"
stefank@2314: #include "c1/c1_MacroAssembler.hpp"
stefank@2314: #include "c1/c1_Runtime1.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "classfile/vmSymbols.hpp"
stefank@2314: #include "code/codeBlob.hpp"
stefank@2314: #include "code/compiledIC.hpp"
stefank@2314: #include "code/pcDesc.hpp"
stefank@2314: #include "code/scopeDesc.hpp"
stefank@2314: #include "code/vtableStubs.hpp"
stefank@2314: #include "compiler/disassembler.hpp"
stefank@2314: #include "gc_interface/collectedHeap.hpp"
stefank@2314: #include "interpreter/bytecode.hpp"
stefank@2314: #include "interpreter/interpreter.hpp"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "memory/barrierSet.hpp"
stefank@2314: #include "memory/oopFactory.hpp"
stefank@2314: #include "memory/resourceArea.hpp"
stefank@2314: #include "oops/objArrayKlass.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "runtime/biasedLocking.hpp"
stefank@2314: #include "runtime/compilationPolicy.hpp"
stefank@2314: #include "runtime/interfaceSupport.hpp"
stefank@2314: #include "runtime/javaCalls.hpp"
stefank@2314: #include "runtime/sharedRuntime.hpp"
stefank@2314: #include "runtime/threadCritical.hpp"
stefank@2314: #include "runtime/vframe.hpp"
stefank@2314: #include "runtime/vframeArray.hpp"
stefank@2314: #include "utilities/copy.hpp"
stefank@2314: #include "utilities/events.hpp"
duke@435: 
duke@435: 
duke@435: // Implementation of StubAssembler
duke@435: 
duke@435: StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) {
duke@435:   _name = name;
duke@435:   _must_gc_arguments = false;
duke@435:   _frame_size = no_frame_size;
duke@435:   _num_rt_args = 0;
duke@435:   _stub_id = stub_id;
duke@435: }
duke@435: 
duke@435: 
duke@435: void StubAssembler::set_info(const char* name, bool must_gc_arguments) {
duke@435:   _name = name;
duke@435:   _must_gc_arguments = must_gc_arguments;
duke@435: }
duke@435: 
duke@435: 
duke@435: void StubAssembler::set_frame_size(int size) {
duke@435:   if (_frame_size == no_frame_size) {
duke@435:     _frame_size = size;
duke@435:   }
duke@435:   assert(_frame_size == size, "can't change the frame size");
duke@435: }
duke@435: 
duke@435: 
duke@435: void StubAssembler::set_num_rt_args(int args) {
duke@435:   if (_num_rt_args == 0) {
duke@435:     _num_rt_args = args;
duke@435:   }
duke@435:   assert(_num_rt_args == args, "can't change the number of args");
duke@435: }
duke@435: 
duke@435: // Implementation of Runtime1
duke@435: 
duke@435: CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids];
duke@435: const char *Runtime1::_blob_names[] = {
duke@435:   RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME)
duke@435: };
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: // statistics
duke@435: int Runtime1::_generic_arraycopy_cnt = 0;
duke@435: int Runtime1::_primitive_arraycopy_cnt = 0;
duke@435: int Runtime1::_oop_arraycopy_cnt = 0;
duke@435: int Runtime1::_arraycopy_slowcase_cnt = 0;
duke@435: int Runtime1::_new_type_array_slowcase_cnt = 0;
duke@435: int Runtime1::_new_object_array_slowcase_cnt = 0;
duke@435: int Runtime1::_new_instance_slowcase_cnt = 0;
duke@435: int Runtime1::_new_multi_array_slowcase_cnt = 0;
duke@435: int Runtime1::_monitorenter_slowcase_cnt = 0;
duke@435: int Runtime1::_monitorexit_slowcase_cnt = 0;
duke@435: int Runtime1::_patch_code_slowcase_cnt = 0;
duke@435: int Runtime1::_throw_range_check_exception_count = 0;
duke@435: int Runtime1::_throw_index_exception_count = 0;
duke@435: int Runtime1::_throw_div0_exception_count = 0;
duke@435: int Runtime1::_throw_null_pointer_exception_count = 0;
duke@435: int Runtime1::_throw_class_cast_exception_count = 0;
duke@435: int Runtime1::_throw_incompatible_class_change_error_count = 0;
duke@435: int Runtime1::_throw_array_store_exception_count = 0;
duke@435: int Runtime1::_throw_count = 0;
duke@435: #endif
duke@435: 
duke@435: // Simple helper to see if the caller of a runtime stub which
duke@435: // entered the VM has been deoptimized
duke@435: 
duke@435: static bool caller_is_deopted() {
duke@435:   JavaThread* thread = JavaThread::current();
duke@435:   RegisterMap reg_map(thread, false);
duke@435:   frame runtime_frame = thread->last_frame();
duke@435:   frame caller_frame = runtime_frame.sender(&reg_map);
duke@435:   assert(caller_frame.is_compiled_frame(), "must be compiled");
duke@435:   return caller_frame.is_deoptimized_frame();
duke@435: }
duke@435: 
duke@435: // Stress deoptimization
duke@435: static void deopt_caller() {
duke@435:   if ( !caller_is_deopted()) {
duke@435:     JavaThread* thread = JavaThread::current();
duke@435:     RegisterMap reg_map(thread, false);
duke@435:     frame runtime_frame = thread->last_frame();
duke@435:     frame caller_frame = runtime_frame.sender(&reg_map);
dcubed@1648:     Deoptimization::deoptimize_frame(thread, caller_frame.id());
duke@435:     assert(caller_is_deopted(), "Must be deoptimized");
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
iveresov@1939: void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) {
duke@435:   assert(0 <= id && id < number_of_ids, "illegal stub id");
duke@435:   ResourceMark rm;
duke@435:   // create code buffer for code storage
twisti@2103:   CodeBuffer code(buffer_blob);
duke@435: 
iveresov@1939:   Compilation::setup_code_buffer(&code, 0);
duke@435: 
duke@435:   // create assembler for code generation
duke@435:   StubAssembler* sasm = new StubAssembler(&code, name_for(id), id);
duke@435:   // generate code for runtime stub
duke@435:   OopMapSet* oop_maps;
duke@435:   oop_maps = generate_code_for(id, sasm);
duke@435:   assert(oop_maps == NULL || sasm->frame_size() != no_frame_size,
duke@435:          "if stub has an oop map it must have a valid frame size");
duke@435: 
duke@435: #ifdef ASSERT
duke@435:   // Make sure that stubs that need oopmaps have them
duke@435:   switch (id) {
duke@435:     // These stubs don't need to have an oopmap
duke@435:     case dtrace_object_alloc_id:
ysr@777:     case g1_pre_barrier_slow_id:
ysr@777:     case g1_post_barrier_slow_id:
duke@435:     case slow_subtype_check_id:
duke@435:     case fpu2long_stub_id:
duke@435:     case unwind_exception_id:
iveresov@2138:     case counter_overflow_id:
bobv@2036: #if defined(SPARC) || defined(PPC)
duke@435:     case handle_exception_nofpu_id:  // Unused on sparc
duke@435: #endif
duke@435:       break;
duke@435: 
duke@435:     // All other stubs should have oopmaps
duke@435:     default:
duke@435:       assert(oop_maps != NULL, "must have an oopmap");
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned)
duke@435:   sasm->align(BytesPerWord);
duke@435:   // make sure all code is in code buffer
duke@435:   sasm->flush();
duke@435:   // create blob - distinguish a few special cases
duke@435:   CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id),
duke@435:                                                  &code,
duke@435:                                                  CodeOffsets::frame_never_safe,
duke@435:                                                  sasm->frame_size(),
duke@435:                                                  oop_maps,
duke@435:                                                  sasm->must_gc_arguments());
duke@435:   // install blob
duke@435:   assert(blob != NULL, "blob must exist");
duke@435:   _blobs[id] = blob;
duke@435: }
duke@435: 
duke@435: 
iveresov@1939: void Runtime1::initialize(BufferBlob* blob) {
iveresov@1939:   // platform-dependent initialization
iveresov@1939:   initialize_pd();
iveresov@1939:   // generate stubs
iveresov@1939:   for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id);
iveresov@1939:   // printing
duke@435: #ifndef PRODUCT
iveresov@1939:   if (PrintSimpleStubs) {
iveresov@1939:     ResourceMark rm;
iveresov@1939:     for (int id = 0; id < number_of_ids; id++) {
iveresov@1939:       _blobs[id]->print();
iveresov@1939:       if (_blobs[id]->oop_maps() != NULL) {
iveresov@1939:         _blobs[id]->oop_maps()->print();
duke@435:       }
duke@435:     }
iveresov@1939:   }
duke@435: #endif
duke@435: }
duke@435: 
duke@435: 
duke@435: CodeBlob* Runtime1::blob_for(StubID id) {
duke@435:   assert(0 <= id && id < number_of_ids, "illegal stub id");
duke@435:   return _blobs[id];
duke@435: }
duke@435: 
duke@435: 
duke@435: const char* Runtime1::name_for(StubID id) {
duke@435:   assert(0 <= id && id < number_of_ids, "illegal stub id");
duke@435:   return _blob_names[id];
duke@435: }
duke@435: 
duke@435: const char* Runtime1::name_for_address(address entry) {
duke@435:   for (int id = 0; id < number_of_ids; id++) {
duke@435:     if (entry == entry_for((StubID)id)) return name_for((StubID)id);
duke@435:   }
duke@435: 
duke@435: #define FUNCTION_CASE(a, f) \
duke@435:   if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f))  return #f
duke@435: 
duke@435:   FUNCTION_CASE(entry, os::javaTimeMillis);
duke@435:   FUNCTION_CASE(entry, os::javaTimeNanos);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::d2f);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::d2i);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::d2l);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dcos);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dexp);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dlog);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dlog10);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dpow);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::drem);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dsin);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dtan);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::f2i);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::f2l);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::frem);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::l2d);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::l2f);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::ldiv);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::lmul);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::lrem);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::lrem);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry);
duke@435:   FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit);
duke@435:   FUNCTION_CASE(entry, trace_block_entry);
duke@435: 
duke@435: #undef FUNCTION_CASE
duke@435: 
bobv@2036:   // Soft float adds more runtime names.
bobv@2036:   return pd_name_for_address(entry);
duke@435: }
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, klassOopDesc* klass))
duke@435:   NOT_PRODUCT(_new_instance_slowcase_cnt++;)
duke@435: 
duke@435:   assert(oop(klass)->is_klass(), "not a class");
duke@435:   instanceKlassHandle h(thread, klass);
duke@435:   h->check_valid_for_instantiation(true, CHECK);
duke@435:   // make sure klass is initialized
duke@435:   h->initialize(CHECK);
duke@435:   // allocate instance and return via TLS
duke@435:   oop obj = h->allocate_instance(CHECK);
duke@435:   thread->set_vm_result(obj);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, klassOopDesc* klass, jint length))
duke@435:   NOT_PRODUCT(_new_type_array_slowcase_cnt++;)
duke@435:   // Note: no handle for klass needed since they are not used
duke@435:   //       anymore after new_typeArray() and no GC can happen before.
duke@435:   //       (This may have to change if this code changes!)
duke@435:   assert(oop(klass)->is_klass(), "not a class");
duke@435:   BasicType elt_type = typeArrayKlass::cast(klass)->element_type();
duke@435:   oop obj = oopFactory::new_typeArray(elt_type, length, CHECK);
duke@435:   thread->set_vm_result(obj);
duke@435:   // This is pretty rare but this runtime patch is stressful to deoptimization
duke@435:   // if we deoptimize here so force a deopt to stress the path.
duke@435:   if (DeoptimizeALot) {
duke@435:     deopt_caller();
duke@435:   }
duke@435: 
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, klassOopDesc* array_klass, jint length))
duke@435:   NOT_PRODUCT(_new_object_array_slowcase_cnt++;)
duke@435: 
duke@435:   // Note: no handle for klass needed since they are not used
duke@435:   //       anymore after new_objArray() and no GC can happen before.
duke@435:   //       (This may have to change if this code changes!)
duke@435:   assert(oop(array_klass)->is_klass(), "not a class");
duke@435:   klassOop elem_klass = objArrayKlass::cast(array_klass)->element_klass();
duke@435:   objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK);
duke@435:   thread->set_vm_result(obj);
duke@435:   // This is pretty rare but this runtime patch is stressful to deoptimization
duke@435:   // if we deoptimize here so force a deopt to stress the path.
duke@435:   if (DeoptimizeALot) {
duke@435:     deopt_caller();
duke@435:   }
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, klassOopDesc* klass, int rank, jint* dims))
duke@435:   NOT_PRODUCT(_new_multi_array_slowcase_cnt++;)
duke@435: 
duke@435:   assert(oop(klass)->is_klass(), "not a class");
duke@435:   assert(rank >= 1, "rank must be nonzero");
duke@435:   oop obj = arrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK);
duke@435:   thread->set_vm_result(obj);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id))
duke@435:   tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread))
duke@435:   THROW(vmSymbolHandles::java_lang_ArrayStoreException());
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::post_jvmti_exception_throw(JavaThread* thread))
dcubed@1648:   if (JvmtiExport::can_post_on_exceptions()) {
duke@435:     vframeStream vfst(thread, true);
duke@435:     address bcp = vfst.method()->bcp_from(vfst.bci());
duke@435:     JvmtiExport::post_exception_throw(thread, vfst.method(), bcp, thread->exception_oop());
duke@435:   }
duke@435: JRT_END
duke@435: 
iveresov@2138: // This is a helper to allow us to safepoint but allow the outer entry
iveresov@2138: // to be safepoint free if we need to do an osr
iveresov@2138: static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, methodOopDesc* m) {
iveresov@2138:   nmethod* osr_nm = NULL;
iveresov@2138:   methodHandle method(THREAD, m);
iveresov@2138: 
iveresov@2138:   RegisterMap map(THREAD, false);
iveresov@2138:   frame fr =  THREAD->last_frame().sender(&map);
duke@435:   nmethod* nm = (nmethod*) fr.cb();
iveresov@2138:   assert(nm!= NULL && nm->is_nmethod(), "Sanity check");
iveresov@2138:   methodHandle enclosing_method(THREAD, nm->method());
iveresov@2138: 
iveresov@2138:   CompLevel level = (CompLevel)nm->comp_level();
iveresov@2138:   int bci = InvocationEntryBci;
iveresov@2138:   if (branch_bci != InvocationEntryBci) {
iveresov@2138:     // Compute desination bci
iveresov@2138:     address pc = method()->code_base() + branch_bci;
iveresov@2138:     Bytecodes::Code branch = Bytecodes::code_at(pc, method());
iveresov@2138:     int offset = 0;
iveresov@2138:     switch (branch) {
iveresov@2138:       case Bytecodes::_if_icmplt: case Bytecodes::_iflt:
iveresov@2138:       case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt:
iveresov@2138:       case Bytecodes::_if_icmple: case Bytecodes::_ifle:
iveresov@2138:       case Bytecodes::_if_icmpge: case Bytecodes::_ifge:
iveresov@2138:       case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq:
iveresov@2138:       case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne:
iveresov@2138:       case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto:
iveresov@2138:         offset = (int16_t)Bytes::get_Java_u2(pc + 1);
iveresov@2138:         break;
iveresov@2138:       case Bytecodes::_goto_w:
iveresov@2138:         offset = Bytes::get_Java_u4(pc + 1);
iveresov@2138:         break;
iveresov@2138:       default: ;
duke@435:     }
iveresov@2138:     bci = branch_bci + offset;
iveresov@2138:   }
iveresov@2138: 
iveresov@2138:   osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, THREAD);
iveresov@2138:   return osr_nm;
iveresov@2138: }
iveresov@2138: 
iveresov@2138: JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, methodOopDesc* method))
iveresov@2138:   nmethod* osr_nm;
iveresov@2138:   JRT_BLOCK
iveresov@2138:     osr_nm = counter_overflow_helper(thread, bci, method);
iveresov@2138:     if (osr_nm != NULL) {
iveresov@2138:       RegisterMap map(thread, false);
iveresov@2138:       frame fr =  thread->last_frame().sender(&map);
never@2260:       Deoptimization::deoptimize_frame(thread, fr.id());
duke@435:     }
iveresov@2138:   JRT_BLOCK_END
iveresov@2138:   return NULL;
duke@435: JRT_END
duke@435: 
duke@435: extern void vm_exit(int code);
duke@435: 
duke@435: // Enter this method from compiled code handler below. This is where we transition
duke@435: // to VM mode. This is done as a helper routine so that the method called directly
duke@435: // from compiled code does not have to transition to VM. This allows the entry
duke@435: // method to see if the nmethod that we have just looked up a handler for has
duke@435: // been deoptimized while we were in the vm. This simplifies the assembly code
duke@435: // cpu directories.
duke@435: //
duke@435: // We are entering here from exception stub (via the entry method below)
duke@435: // If there is a compiled exception handler in this method, we will continue there;
duke@435: // otherwise we will unwind the stack and continue at the caller of top frame method
duke@435: // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to
duke@435: // control the area where we can allow a safepoint. After we exit the safepoint area we can
duke@435: // check to see if the handler we are going to return is now in a nmethod that has
duke@435: // been deoptimized. If that is the case we return the deopt blob
duke@435: // unpack_with_exception entry instead. This makes life for the exception blob easier
duke@435: // because making that same check and diverting is painful from assembly language.
duke@435: //
duke@435: 
duke@435: 
duke@435: JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm))
duke@435: 
duke@435:   Handle exception(thread, ex);
duke@435:   nm = CodeCache::find_nmethod(pc);
duke@435:   assert(nm != NULL, "this is not an nmethod");
duke@435:   // Adjust the pc as needed/
duke@435:   if (nm->is_deopt_pc(pc)) {
duke@435:     RegisterMap map(thread, false);
duke@435:     frame exception_frame = thread->last_frame().sender(&map);
duke@435:     // if the frame isn't deopted then pc must not correspond to the caller of last_frame
duke@435:     assert(exception_frame.is_deoptimized_frame(), "must be deopted");
duke@435:     pc = exception_frame.pc();
duke@435:   }
duke@435: #ifdef ASSERT
duke@435:   assert(exception.not_null(), "NULL exceptions should be handled by throw_exception");
duke@435:   assert(exception->is_oop(), "just checking");
duke@435:   // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
never@1577:   if (!(exception->is_a(SystemDictionary::Throwable_klass()))) {
duke@435:     if (ExitVMOnVerifyError) vm_exit(-1);
duke@435:     ShouldNotReachHere();
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   // Check the stack guard pages and reenable them if necessary and there is
duke@435:   // enough space on the stack to do so.  Use fast exceptions only if the guard
duke@435:   // pages are enabled.
duke@435:   bool guard_pages_enabled = thread->stack_yellow_zone_enabled();
duke@435:   if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack();
duke@435: 
dcubed@1648:   if (JvmtiExport::can_post_on_exceptions()) {
duke@435:     // To ensure correct notification of exception catches and throws
duke@435:     // we have to deoptimize here.  If we attempted to notify the
duke@435:     // catches and throws during this exception lookup it's possible
duke@435:     // we could deoptimize on the way out of the VM and end back in
duke@435:     // the interpreter at the throw site.  This would result in double
duke@435:     // notifications since the interpreter would also notify about
duke@435:     // these same catches and throws as it unwound the frame.
duke@435: 
duke@435:     RegisterMap reg_map(thread);
duke@435:     frame stub_frame = thread->last_frame();
duke@435:     frame caller_frame = stub_frame.sender(&reg_map);
duke@435: 
duke@435:     // We don't really want to deoptimize the nmethod itself since we
duke@435:     // can actually continue in the exception handler ourselves but I
duke@435:     // don't see an easy way to have the desired effect.
never@2260:     Deoptimization::deoptimize_frame(thread, caller_frame.id());
never@2260:     assert(caller_is_deopted(), "Must be deoptimized");
duke@435: 
duke@435:     return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
duke@435:   }
duke@435: 
duke@435:   // ExceptionCache is used only for exceptions at call and not for implicit exceptions
duke@435:   if (guard_pages_enabled) {
duke@435:     address fast_continuation = nm->handler_for_exception_and_pc(exception, pc);
duke@435:     if (fast_continuation != NULL) {
duke@435:       if (fast_continuation == ExceptionCache::unwind_handler()) fast_continuation = NULL;
duke@435:       return fast_continuation;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   // If the stack guard pages are enabled, check whether there is a handler in
duke@435:   // the current method.  Otherwise (guard pages disabled), force an unwind and
duke@435:   // skip the exception cache update (i.e., just leave continuation==NULL).
duke@435:   address continuation = NULL;
duke@435:   if (guard_pages_enabled) {
duke@435: 
duke@435:     // New exception handling mechanism can support inlined methods
duke@435:     // with exception handlers since the mappings are from PC to PC
duke@435: 
duke@435:     // debugging support
duke@435:     // tracing
duke@435:     if (TraceExceptions) {
duke@435:       ttyLocker ttyl;
duke@435:       ResourceMark rm;
duke@435:       tty->print_cr("Exception <%s> (0x%x) thrown in compiled method <%s> at PC " PTR_FORMAT " for thread 0x%x",
duke@435:                     exception->print_value_string(), (address)exception(), nm->method()->print_value_string(), pc, thread);
duke@435:     }
duke@435:     // for AbortVMOnException flag
duke@435:     NOT_PRODUCT(Exceptions::debug_check_abort(exception));
duke@435: 
duke@435:     // Clear out the exception oop and pc since looking up an
duke@435:     // exception handler can cause class loading, which might throw an
duke@435:     // exception and those fields are expected to be clear during
duke@435:     // normal bytecode execution.
duke@435:     thread->set_exception_oop(NULL);
duke@435:     thread->set_exception_pc(NULL);
duke@435: 
duke@435:     continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false);
duke@435:     // If an exception was thrown during exception dispatch, the exception oop may have changed
duke@435:     thread->set_exception_oop(exception());
duke@435:     thread->set_exception_pc(pc);
duke@435: 
duke@435:     // the exception cache is used only by non-implicit exceptions
duke@435:     if (continuation == NULL) {
duke@435:       nm->add_handler_for_exception_and_pc(exception, pc, ExceptionCache::unwind_handler());
duke@435:     } else {
duke@435:       nm->add_handler_for_exception_and_pc(exception, pc, continuation);
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   thread->set_vm_result(exception());
duke@435: 
duke@435:   if (TraceExceptions) {
duke@435:     ttyLocker ttyl;
duke@435:     ResourceMark rm;
duke@435:     tty->print_cr("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT " for exception thrown at PC " PTR_FORMAT,
duke@435:                   thread, continuation, pc);
duke@435:   }
duke@435: 
duke@435:   return continuation;
duke@435: JRT_END
duke@435: 
duke@435: // Enter this method from compiled code only if there is a Java exception handler
duke@435: // in the method handling the exception
duke@435: // We are entering here from exception stub. We don't do a normal VM transition here.
duke@435: // We do it in a helper. This is so we can check to see if the nmethod we have just
duke@435: // searched for an exception handler has been deoptimized in the meantime.
duke@435: address  Runtime1::exception_handler_for_pc(JavaThread* thread) {
duke@435:   oop exception = thread->exception_oop();
duke@435:   address pc = thread->exception_pc();
duke@435:   // Still in Java mode
duke@435:   debug_only(ResetNoHandleMark rnhm);
duke@435:   nmethod* nm = NULL;
duke@435:   address continuation = NULL;
duke@435:   {
duke@435:     // Enter VM mode by calling the helper
duke@435: 
duke@435:     ResetNoHandleMark rnhm;
duke@435:     continuation = exception_handler_for_pc_helper(thread, exception, pc, nm);
duke@435:   }
duke@435:   // Back in JAVA, use no oops DON'T safepoint
duke@435: 
duke@435:   // Now check to see if the nmethod we were called from is now deoptimized.
duke@435:   // If so we must return to the deopt blob and deoptimize the nmethod
duke@435: 
duke@435:   if (nm != NULL && caller_is_deopted()) {
duke@435:     continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls();
duke@435:   }
duke@435: 
duke@435:   return continuation;
duke@435: }
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index))
duke@435:   NOT_PRODUCT(_throw_range_check_exception_count++;)
duke@435:   Events::log("throw_range_check");
duke@435:   char message[jintAsStringSize];
duke@435:   sprintf(message, "%d", index);
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index))
duke@435:   NOT_PRODUCT(_throw_index_exception_count++;)
duke@435:   Events::log("throw_index");
duke@435:   char message[16];
duke@435:   sprintf(message, "%d", index);
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread))
duke@435:   NOT_PRODUCT(_throw_div0_exception_count++;)
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread))
duke@435:   NOT_PRODUCT(_throw_null_pointer_exception_count++;)
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException());
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object))
duke@435:   NOT_PRODUCT(_throw_class_cast_exception_count++;)
duke@435:   ResourceMark rm(thread);
duke@435:   char* message = SharedRuntime::generate_class_cast_message(
duke@435:     thread, Klass::cast(object->klass())->external_name());
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(
duke@435:     thread, vmSymbols::java_lang_ClassCastException(), message);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread))
duke@435:   NOT_PRODUCT(_throw_incompatible_class_change_error_count++;)
duke@435:   ResourceMark rm(thread);
duke@435:   SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError());
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock))
duke@435:   NOT_PRODUCT(_monitorenter_slowcase_cnt++;)
duke@435:   if (PrintBiasedLockingStatistics) {
duke@435:     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
duke@435:   }
duke@435:   Handle h_obj(thread, obj);
duke@435:   assert(h_obj()->is_oop(), "must be NULL or an object");
duke@435:   if (UseBiasedLocking) {
duke@435:     // Retry fast entry if bias is revoked to avoid unnecessary inflation
duke@435:     ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK);
duke@435:   } else {
duke@435:     if (UseFastLocking) {
duke@435:       // When using fast locking, the compiled code has already tried the fast case
duke@435:       assert(obj == lock->obj(), "must match");
duke@435:       ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD);
duke@435:     } else {
duke@435:       lock->set_obj(obj);
duke@435:       ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD);
duke@435:     }
duke@435:   }
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock))
duke@435:   NOT_PRODUCT(_monitorexit_slowcase_cnt++;)
duke@435:   assert(thread == JavaThread::current(), "threads must correspond");
duke@435:   assert(thread->last_Java_sp(), "last_Java_sp must be set");
duke@435:   // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown
duke@435:   EXCEPTION_MARK;
duke@435: 
duke@435:   oop obj = lock->obj();
duke@435:   assert(obj->is_oop(), "must be NULL or an object");
duke@435:   if (UseFastLocking) {
duke@435:     // When using fast locking, the compiled code has already tried the fast case
duke@435:     ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD);
duke@435:   } else {
duke@435:     ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD);
duke@435:   }
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: static klassOop resolve_field_return_klass(methodHandle caller, int bci, TRAPS) {
jrose@1957:   Bytecode_field* field_access = Bytecode_field_at(caller, bci);
duke@435:   // This can be static or non-static field access
duke@435:   Bytecodes::Code code       = field_access->code();
duke@435: 
duke@435:   // We must load class, initialize class and resolvethe field
duke@435:   FieldAccessInfo result; // initialize class if needed
duke@435:   constantPoolHandle constants(THREAD, caller->constants());
duke@435:   LinkResolver::resolve_field(result, constants, field_access->index(), Bytecodes::java_code(code), false, CHECK_NULL);
duke@435:   return result.klass()();
duke@435: }
duke@435: 
duke@435: 
duke@435: //
duke@435: // This routine patches sites where a class wasn't loaded or
duke@435: // initialized at the time the code was generated.  It handles
duke@435: // references to classes, fields and forcing of initialization.  Most
duke@435: // of the cases are straightforward and involving simply forcing
duke@435: // resolution of a class, rewriting the instruction stream with the
duke@435: // needed constant and replacing the call in this function with the
duke@435: // patched code.  The case for static field is more complicated since
duke@435: // the thread which is in the process of initializing a class can
duke@435: // access it's static fields but other threads can't so the code
duke@435: // either has to deoptimize when this case is detected or execute a
duke@435: // check that the current thread is the initializing thread.  The
duke@435: // current
duke@435: //
duke@435: // Patches basically look like this:
duke@435: //
duke@435: //
duke@435: // patch_site: jmp patch stub     ;; will be patched
duke@435: // continue:   ...
duke@435: //             ...
duke@435: //             ...
duke@435: //             ...
duke@435: //
duke@435: // They have a stub which looks like this:
duke@435: //
duke@435: //             ;; patch body
duke@435: //             movl <const>, reg           (for class constants)
duke@435: //        <or> movl [reg1 + <const>], reg  (for field offsets)
duke@435: //        <or> movl reg, [reg1 + <const>]  (for field offsets)
duke@435: //             <being_init offset> <bytes to copy> <bytes to skip>
duke@435: // patch_stub: call Runtime1::patch_code (through a runtime stub)
duke@435: //             jmp patch_site
duke@435: //
duke@435: //
duke@435: // A normal patch is done by rewriting the patch body, usually a move,
duke@435: // and then copying it into place over top of the jmp instruction
duke@435: // being careful to flush caches and doing it in an MP-safe way.  The
duke@435: // constants following the patch body are used to find various pieces
duke@435: // of the patch relative to the call site for Runtime1::patch_code.
duke@435: // The case for getstatic and putstatic is more complicated because
duke@435: // getstatic and putstatic have special semantics when executing while
duke@435: // the class is being initialized.  getstatic/putstatic on a class
duke@435: // which is being_initialized may be executed by the initializing
duke@435: // thread but other threads have to block when they execute it.  This
duke@435: // is accomplished in compiled code by executing a test of the current
duke@435: // thread against the initializing thread of the class.  It's emitted
duke@435: // as boilerplate in their stub which allows the patched code to be
duke@435: // executed before it's copied back into the main body of the nmethod.
duke@435: //
duke@435: // being_init: get_thread(<tmp reg>
duke@435: //             cmpl [reg1 + <init_thread_offset>], <tmp reg>
duke@435: //             jne patch_stub
duke@435: //             movl [reg1 + <const>], reg  (for field offsets)  <or>
duke@435: //             movl reg, [reg1 + <const>]  (for field offsets)
duke@435: //             jmp continue
duke@435: //             <being_init offset> <bytes to copy> <bytes to skip>
duke@435: // patch_stub: jmp Runtim1::patch_code (through a runtime stub)
duke@435: //             jmp patch_site
duke@435: //
duke@435: // If the class is being initialized the patch body is rewritten and
duke@435: // the patch site is rewritten to jump to being_init, instead of
duke@435: // patch_stub.  Whenever this code is executed it checks the current
duke@435: // thread against the intializing thread so other threads will enter
duke@435: // the runtime and end up blocked waiting the class to finish
duke@435: // initializing inside the calls to resolve_field below.  The
duke@435: // initializing class will continue on it's way.  Once the class is
duke@435: // fully_initialized, the intializing_thread of the class becomes
duke@435: // NULL, so the next thread to execute this code will fail the test,
duke@435: // call into patch_code and complete the patching process by copying
duke@435: // the patch body back into the main part of the nmethod and resume
duke@435: // executing.
duke@435: //
duke@435: //
duke@435: 
duke@435: JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id ))
duke@435:   NOT_PRODUCT(_patch_code_slowcase_cnt++;)
duke@435: 
duke@435:   ResourceMark rm(thread);
duke@435:   RegisterMap reg_map(thread, false);
duke@435:   frame runtime_frame = thread->last_frame();
duke@435:   frame caller_frame = runtime_frame.sender(&reg_map);
duke@435: 
duke@435:   // last java frame on stack
duke@435:   vframeStream vfst(thread, true);
duke@435:   assert(!vfst.at_end(), "Java frame must exist");
duke@435: 
duke@435:   methodHandle caller_method(THREAD, vfst.method());
duke@435:   // Note that caller_method->code() may not be same as caller_code because of OSR's
duke@435:   // Note also that in the presence of inlining it is not guaranteed
duke@435:   // that caller_method() == caller_code->method()
duke@435: 
duke@435: 
duke@435:   int bci = vfst.bci();
duke@435: 
duke@435:   Events::log("patch_code @ " INTPTR_FORMAT , caller_frame.pc());
duke@435: 
duke@435:   Bytecodes::Code code = Bytecode_at(caller_method->bcp_from(bci))->java_code();
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   // this is used by assertions in the access_field_patching_id
duke@435:   BasicType patch_field_type = T_ILLEGAL;
duke@435: #endif // PRODUCT
duke@435:   bool deoptimize_for_volatile = false;
duke@435:   int patch_field_offset = -1;
duke@435:   KlassHandle init_klass(THREAD, klassOop(NULL)); // klass needed by access_field_patching code
duke@435:   Handle load_klass(THREAD, NULL);                // oop needed by load_klass_patching code
duke@435:   if (stub_id == Runtime1::access_field_patching_id) {
duke@435: 
jrose@1957:     Bytecode_field* field_access = Bytecode_field_at(caller_method, bci);
duke@435:     FieldAccessInfo result; // initialize class if needed
duke@435:     Bytecodes::Code code = field_access->code();
duke@435:     constantPoolHandle constants(THREAD, caller_method->constants());
duke@435:     LinkResolver::resolve_field(result, constants, field_access->index(), Bytecodes::java_code(code), false, CHECK);
duke@435:     patch_field_offset = result.field_offset();
duke@435: 
duke@435:     // If we're patching a field which is volatile then at compile it
duke@435:     // must not have been know to be volatile, so the generated code
duke@435:     // isn't correct for a volatile reference.  The nmethod has to be
duke@435:     // deoptimized so that the code can be regenerated correctly.
duke@435:     // This check is only needed for access_field_patching since this
duke@435:     // is the path for patching field offsets.  load_klass is only
duke@435:     // used for patching references to oops which don't need special
duke@435:     // handling in the volatile case.
duke@435:     deoptimize_for_volatile = result.access_flags().is_volatile();
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:     patch_field_type = result.field_type();
duke@435: #endif
duke@435:   } else if (stub_id == Runtime1::load_klass_patching_id) {
duke@435:     oop k;
duke@435:     switch (code) {
duke@435:       case Bytecodes::_putstatic:
duke@435:       case Bytecodes::_getstatic:
duke@435:         { klassOop klass = resolve_field_return_klass(caller_method, bci, CHECK);
duke@435:           // Save a reference to the class that has to be checked for initialization
duke@435:           init_klass = KlassHandle(THREAD, klass);
duke@435:           k = klass;
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_new:
duke@435:         { Bytecode_new* bnew = Bytecode_new_at(caller_method->bcp_from(bci));
duke@435:           k = caller_method->constants()->klass_at(bnew->index(), CHECK);
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_multianewarray:
duke@435:         { Bytecode_multianewarray* mna = Bytecode_multianewarray_at(caller_method->bcp_from(bci));
duke@435:           k = caller_method->constants()->klass_at(mna->index(), CHECK);
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_instanceof:
duke@435:         { Bytecode_instanceof* io = Bytecode_instanceof_at(caller_method->bcp_from(bci));
duke@435:           k = caller_method->constants()->klass_at(io->index(), CHECK);
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_checkcast:
duke@435:         { Bytecode_checkcast* cc = Bytecode_checkcast_at(caller_method->bcp_from(bci));
duke@435:           k = caller_method->constants()->klass_at(cc->index(), CHECK);
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_anewarray:
duke@435:         { Bytecode_anewarray* anew = Bytecode_anewarray_at(caller_method->bcp_from(bci));
duke@435:           klassOop ek = caller_method->constants()->klass_at(anew->index(), CHECK);
duke@435:           k = Klass::cast(ek)->array_klass(CHECK);
duke@435:         }
duke@435:         break;
duke@435:       case Bytecodes::_ldc:
duke@435:       case Bytecodes::_ldc_w:
duke@435:         {
jrose@1957:           Bytecode_loadconstant* cc = Bytecode_loadconstant_at(caller_method, bci);
jrose@1957:           k = cc->resolve_constant(CHECK);
jrose@1957:           assert(k != NULL && !k->is_klass(), "must be class mirror or other Java constant");
duke@435:         }
duke@435:         break;
duke@435:       default: Unimplemented();
duke@435:     }
duke@435:     // convert to handle
duke@435:     load_klass = Handle(THREAD, k);
duke@435:   } else {
duke@435:     ShouldNotReachHere();
duke@435:   }
duke@435: 
duke@435:   if (deoptimize_for_volatile) {
duke@435:     // At compile time we assumed the field wasn't volatile but after
duke@435:     // loading it turns out it was volatile so we have to throw the
duke@435:     // compiled code out and let it be regenerated.
duke@435:     if (TracePatching) {
duke@435:       tty->print_cr("Deoptimizing for patching volatile field reference");
duke@435:     }
never@920:     // It's possible the nmethod was invalidated in the last
never@920:     // safepoint, but if it's still alive then make it not_entrant.
never@920:     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
never@920:     if (nm != NULL) {
never@920:       nm->make_not_entrant();
never@920:     }
never@920: 
never@2260:     Deoptimization::deoptimize_frame(thread, caller_frame.id());
duke@435: 
duke@435:     // Return to the now deoptimized frame.
duke@435:   }
duke@435: 
jrose@1957:   // If we are patching in a non-perm oop, make sure the nmethod
jrose@1957:   // is on the right list.
jrose@1957:   if (ScavengeRootsInCode && load_klass.not_null() && load_klass->is_scavengable()) {
jrose@1957:     MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag);
jrose@1957:     nmethod* nm = CodeCache::find_nmethod(caller_frame.pc());
jrose@1957:     guarantee(nm != NULL, "only nmethods can contain non-perm oops");
jrose@1957:     if (!nm->on_scavenge_root_list())
jrose@1957:       CodeCache::add_scavenge_root_nmethod(nm);
jrose@1957:   }
duke@435: 
duke@435:   // Now copy code back
duke@435: 
duke@435:   {
duke@435:     MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag);
duke@435:     //
duke@435:     // Deoptimization may have happened while we waited for the lock.
duke@435:     // In that case we don't bother to do any patching we just return
duke@435:     // and let the deopt happen
duke@435:     if (!caller_is_deopted()) {
duke@435:       NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc());
duke@435:       address instr_pc = jump->jump_destination();
duke@435:       NativeInstruction* ni = nativeInstruction_at(instr_pc);
duke@435:       if (ni->is_jump() ) {
duke@435:         // the jump has not been patched yet
duke@435:         // The jump destination is slow case and therefore not part of the stubs
duke@435:         // (stubs are only for StaticCalls)
duke@435: 
duke@435:         // format of buffer
duke@435:         //    ....
duke@435:         //    instr byte 0     <-- copy_buff
duke@435:         //    instr byte 1
duke@435:         //    ..
duke@435:         //    instr byte n-1
duke@435:         //      n
duke@435:         //    ....             <-- call destination
duke@435: 
duke@435:         address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset();
duke@435:         unsigned char* byte_count = (unsigned char*) (stub_location - 1);
duke@435:         unsigned char* byte_skip = (unsigned char*) (stub_location - 2);
duke@435:         unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3);
duke@435:         address copy_buff = stub_location - *byte_skip - *byte_count;
duke@435:         address being_initialized_entry = stub_location - *being_initialized_entry_offset;
duke@435:         if (TracePatching) {
duke@435:           tty->print_cr(" Patching %s at bci %d at address 0x%x  (%s)", Bytecodes::name(code), bci,
duke@435:                         instr_pc, (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass");
duke@435:           nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc());
duke@435:           assert(caller_code != NULL, "nmethod not found");
duke@435: 
duke@435:           // NOTE we use pc() not original_pc() because we already know they are
duke@435:           // identical otherwise we'd have never entered this block of code
duke@435: 
duke@435:           OopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc());
duke@435:           assert(map != NULL, "null check");
duke@435:           map->print();
duke@435:           tty->cr();
duke@435: 
duke@435:           Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
duke@435:         }
duke@435:         // depending on the code below, do_patch says whether to copy the patch body back into the nmethod
duke@435:         bool do_patch = true;
duke@435:         if (stub_id == Runtime1::access_field_patching_id) {
duke@435:           // The offset may not be correct if the class was not loaded at code generation time.
duke@435:           // Set it now.
duke@435:           NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff);
duke@435:           assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type");
duke@435:           assert(patch_field_offset >= 0, "illegal offset");
duke@435:           n_move->add_offset_in_bytes(patch_field_offset);
duke@435:         } else if (stub_id == Runtime1::load_klass_patching_id) {
duke@435:           // If a getstatic or putstatic is referencing a klass which
duke@435:           // isn't fully initialized, the patch body isn't copied into
duke@435:           // place until initialization is complete.  In this case the
duke@435:           // patch site is setup so that any threads besides the
duke@435:           // initializing thread are forced to come into the VM and
duke@435:           // block.
duke@435:           do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) ||
duke@435:                      instanceKlass::cast(init_klass())->is_initialized();
duke@435:           NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc);
duke@435:           if (jump->jump_destination() == being_initialized_entry) {
duke@435:             assert(do_patch == true, "initialization must be complete at this point");
duke@435:           } else {
duke@435:             // patch the instruction <move reg, klass>
duke@435:             NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff);
bobv@2036: 
bobv@2036:             assert(n_copy->data() == 0 ||
iveresov@2138:                    n_copy->data() == (intptr_t)Universe::non_oop_word(),
bobv@2036:                    "illegal init value");
duke@435:             assert(load_klass() != NULL, "klass not set");
duke@435:             n_copy->set_data((intx) (load_klass()));
duke@435: 
duke@435:             if (TracePatching) {
duke@435:               Disassembler::decode(copy_buff, copy_buff + *byte_count, tty);
duke@435:             }
duke@435: 
bobv@2036: #if defined(SPARC) || defined(PPC)
duke@435:             // Update the oop location in the nmethod with the proper
duke@435:             // oop.  When the code was generated, a NULL was stuffed
duke@435:             // in the oop table and that table needs to be update to
duke@435:             // have the right value.  On intel the value is kept
duke@435:             // directly in the instruction instead of in the oop
duke@435:             // table, so set_data above effectively updated the value.
duke@435:             nmethod* nm = CodeCache::find_nmethod(instr_pc);
duke@435:             assert(nm != NULL, "invalid nmethod_pc");
duke@435:             RelocIterator oops(nm, copy_buff, copy_buff + 1);
duke@435:             bool found = false;
duke@435:             while (oops.next() && !found) {
duke@435:               if (oops.type() == relocInfo::oop_type) {
duke@435:                 oop_Relocation* r = oops.oop_reloc();
duke@435:                 oop* oop_adr = r->oop_addr();
duke@435:                 *oop_adr = load_klass();
duke@435:                 r->fix_oop_relocation();
duke@435:                 found = true;
duke@435:               }
duke@435:             }
duke@435:             assert(found, "the oop must exist!");
duke@435: #endif
duke@435: 
duke@435:           }
duke@435:         } else {
duke@435:           ShouldNotReachHere();
duke@435:         }
duke@435:         if (do_patch) {
duke@435:           // replace instructions
duke@435:           // first replace the tail, then the call
bobv@2036: #ifdef ARM
bobv@2036:           if(stub_id == Runtime1::load_klass_patching_id && !VM_Version::supports_movw()) {
bobv@2036:             copy_buff -= *byte_count;
bobv@2036:             NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff);
bobv@2036:             n_copy2->set_data((intx) (load_klass()), instr_pc);
bobv@2036:           }
bobv@2036: #endif
bobv@2036: 
duke@435:           for (int i = NativeCall::instruction_size; i < *byte_count; i++) {
duke@435:             address ptr = copy_buff + i;
duke@435:             int a_byte = (*ptr) & 0xFF;
duke@435:             address dst = instr_pc + i;
duke@435:             *(unsigned char*)dst = (unsigned char) a_byte;
duke@435:           }
duke@435:           ICache::invalidate_range(instr_pc, *byte_count);
duke@435:           NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff);
duke@435: 
duke@435:           if (stub_id == Runtime1::load_klass_patching_id) {
duke@435:             // update relocInfo to oop
duke@435:             nmethod* nm = CodeCache::find_nmethod(instr_pc);
duke@435:             assert(nm != NULL, "invalid nmethod_pc");
duke@435: 
duke@435:             // The old patch site is now a move instruction so update
duke@435:             // the reloc info so that it will get updated during
duke@435:             // future GCs.
duke@435:             RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1));
duke@435:             relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc,
duke@435:                                                      relocInfo::none, relocInfo::oop_type);
duke@435: #ifdef SPARC
duke@435:             // Sparc takes two relocations for an oop so update the second one.
duke@435:             address instr_pc2 = instr_pc + NativeMovConstReg::add_offset;
duke@435:             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
duke@435:             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2,
duke@435:                                                      relocInfo::none, relocInfo::oop_type);
duke@435: #endif
bobv@2036: #ifdef PPC
bobv@2036:           { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset;
bobv@2036:             RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1);
bobv@2036:             relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, relocInfo::none, relocInfo::oop_type);
bobv@2036:           }
bobv@2036: #endif
duke@435:           }
duke@435: 
duke@435:         } else {
duke@435:           ICache::invalidate_range(copy_buff, *byte_count);
duke@435:           NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry);
duke@435:         }
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: JRT_END
duke@435: 
duke@435: //
duke@435: // Entry point for compiled code. We want to patch a nmethod.
duke@435: // We don't do a normal VM transition here because we want to
duke@435: // know after the patching is complete and any safepoint(s) are taken
duke@435: // if the calling nmethod was deoptimized. We do this by calling a
duke@435: // helper method which does the normal VM transition and when it
duke@435: // completes we can check for deoptimization. This simplifies the
duke@435: // assembly code in the cpu directories.
duke@435: //
duke@435: int Runtime1::move_klass_patching(JavaThread* thread) {
duke@435: //
duke@435: // NOTE: we are still in Java
duke@435: //
duke@435:   Thread* THREAD = thread;
duke@435:   debug_only(NoHandleMark nhm;)
duke@435:   {
duke@435:     // Enter VM mode
duke@435: 
duke@435:     ResetNoHandleMark rnhm;
duke@435:     patch_code(thread, load_klass_patching_id);
duke@435:   }
duke@435:   // Back in JAVA, use no oops DON'T safepoint
duke@435: 
duke@435:   // Return true if calling code is deoptimized
duke@435: 
duke@435:   return caller_is_deopted();
duke@435: }
duke@435: 
duke@435: //
duke@435: // Entry point for compiled code. We want to patch a nmethod.
duke@435: // We don't do a normal VM transition here because we want to
duke@435: // know after the patching is complete and any safepoint(s) are taken
duke@435: // if the calling nmethod was deoptimized. We do this by calling a
duke@435: // helper method which does the normal VM transition and when it
duke@435: // completes we can check for deoptimization. This simplifies the
duke@435: // assembly code in the cpu directories.
duke@435: //
duke@435: 
duke@435: int Runtime1::access_field_patching(JavaThread* thread) {
duke@435: //
duke@435: // NOTE: we are still in Java
duke@435: //
duke@435:   Thread* THREAD = thread;
duke@435:   debug_only(NoHandleMark nhm;)
duke@435:   {
duke@435:     // Enter VM mode
duke@435: 
duke@435:     ResetNoHandleMark rnhm;
duke@435:     patch_code(thread, access_field_patching_id);
duke@435:   }
duke@435:   // Back in JAVA, use no oops DON'T safepoint
duke@435: 
duke@435:   // Return true if calling code is deoptimized
duke@435: 
duke@435:   return caller_is_deopted();
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id))
duke@435:   // for now we just print out the block id
duke@435:   tty->print("%d ", block_id);
duke@435: JRT_END
duke@435: 
duke@435: 
coleenp@548: // Array copy return codes.
coleenp@548: enum {
coleenp@548:   ac_failed = -1, // arraycopy failed
coleenp@548:   ac_ok = 0       // arraycopy succeeded
coleenp@548: };
coleenp@548: 
coleenp@548: 
ysr@1680: // Below length is the # elements copied.
coleenp@548: template <class T> int obj_arraycopy_work(oopDesc* src, T* src_addr,
coleenp@548:                                           oopDesc* dst, T* dst_addr,
coleenp@548:                                           int length) {
coleenp@548: 
coleenp@548:   // For performance reasons, we assume we are using a card marking write
coleenp@548:   // barrier. The assert will fail if this is not the case.
coleenp@548:   // Note that we use the non-virtual inlineable variant of write_ref_array.
coleenp@548:   BarrierSet* bs = Universe::heap()->barrier_set();
ysr@1680:   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
ysr@1680:   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");
coleenp@548:   if (src == dst) {
coleenp@548:     // same object, no check
ysr@1680:     bs->write_ref_array_pre(dst_addr, length);
coleenp@548:     Copy::conjoint_oops_atomic(src_addr, dst_addr, length);
ysr@1680:     bs->write_ref_array((HeapWord*)dst_addr, length);
coleenp@548:     return ac_ok;
coleenp@548:   } else {
coleenp@548:     klassOop bound = objArrayKlass::cast(dst->klass())->element_klass();
coleenp@548:     klassOop stype = objArrayKlass::cast(src->klass())->element_klass();
coleenp@548:     if (stype == bound || Klass::cast(stype)->is_subtype_of(bound)) {
coleenp@548:       // Elements are guaranteed to be subtypes, so no check necessary
ysr@1680:       bs->write_ref_array_pre(dst_addr, length);
coleenp@548:       Copy::conjoint_oops_atomic(src_addr, dst_addr, length);
ysr@1680:       bs->write_ref_array((HeapWord*)dst_addr, length);
coleenp@548:       return ac_ok;
coleenp@548:     }
coleenp@548:   }
coleenp@548:   return ac_failed;
coleenp@548: }
coleenp@548: 
duke@435: // fast and direct copy of arrays; returning -1, means that an exception may be thrown
duke@435: // and we did not copy anything
duke@435: JRT_LEAF(int, Runtime1::arraycopy(oopDesc* src, int src_pos, oopDesc* dst, int dst_pos, int length))
duke@435: #ifndef PRODUCT
duke@435:   _generic_arraycopy_cnt++;        // Slow-path oop array copy
duke@435: #endif
duke@435: 
duke@435:   if (src == NULL || dst == NULL || src_pos < 0 || dst_pos < 0 || length < 0) return ac_failed;
duke@435:   if (!dst->is_array() || !src->is_array()) return ac_failed;
duke@435:   if ((unsigned int) arrayOop(src)->length() < (unsigned int)src_pos + (unsigned int)length) return ac_failed;
duke@435:   if ((unsigned int) arrayOop(dst)->length() < (unsigned int)dst_pos + (unsigned int)length) return ac_failed;
duke@435: 
duke@435:   if (length == 0) return ac_ok;
duke@435:   if (src->is_typeArray()) {
duke@435:     const klassOop klass_oop = src->klass();
duke@435:     if (klass_oop != dst->klass()) return ac_failed;
duke@435:     typeArrayKlass* klass = typeArrayKlass::cast(klass_oop);
duke@435:     const int l2es = klass->log2_element_size();
duke@435:     const int ihs = klass->array_header_in_bytes() / wordSize;
duke@435:     char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es);
duke@435:     char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es);
duke@435:     // Potential problem: memmove is not guaranteed to be word atomic
duke@435:     // Revisit in Merlin
duke@435:     memmove(dst_addr, src_addr, length << l2es);
duke@435:     return ac_ok;
duke@435:   } else if (src->is_objArray() && dst->is_objArray()) {
iveresov@2344:     if (UseCompressedOops) {
coleenp@548:       narrowOop *src_addr  = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos);
coleenp@548:       narrowOop *dst_addr  = objArrayOop(dst)->obj_at_addr<narrowOop>(dst_pos);
coleenp@548:       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);
duke@435:     } else {
coleenp@548:       oop *src_addr  = objArrayOop(src)->obj_at_addr<oop>(src_pos);
coleenp@548:       oop *dst_addr  = objArrayOop(dst)->obj_at_addr<oop>(dst_pos);
coleenp@548:       return obj_arraycopy_work(src, src_addr, dst, dst_addr, length);
duke@435:     }
duke@435:   }
duke@435:   return ac_failed;
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: JRT_LEAF(void, Runtime1::primitive_arraycopy(HeapWord* src, HeapWord* dst, int length))
duke@435: #ifndef PRODUCT
duke@435:   _primitive_arraycopy_cnt++;
duke@435: #endif
duke@435: 
duke@435:   if (length == 0) return;
duke@435:   // Not guaranteed to be word atomic, but that doesn't matter
duke@435:   // for anything but an oop array, which is covered by oop_arraycopy.
kvn@1958:   Copy::conjoint_jbytes(src, dst, length);
duke@435: JRT_END
duke@435: 
duke@435: JRT_LEAF(void, Runtime1::oop_arraycopy(HeapWord* src, HeapWord* dst, int num))
duke@435: #ifndef PRODUCT
duke@435:   _oop_arraycopy_cnt++;
duke@435: #endif
duke@435: 
duke@435:   if (num == 0) return;
ysr@1680:   BarrierSet* bs = Universe::heap()->barrier_set();
ysr@1680:   assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
ysr@1680:   assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");
ysr@1680:   if (UseCompressedOops) {
ysr@1680:     bs->write_ref_array_pre((narrowOop*)dst, num);
iveresov@2344:     Copy::conjoint_oops_atomic((narrowOop*) src, (narrowOop*) dst, num);
ysr@1680:   } else {
ysr@1680:     bs->write_ref_array_pre((oop*)dst, num);
iveresov@2344:     Copy::conjoint_oops_atomic((oop*) src, (oop*) dst, num);
ysr@1680:   }
ysr@1680:   bs->write_ref_array(dst, num);
duke@435: JRT_END
duke@435: 
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: void Runtime1::print_statistics() {
duke@435:   tty->print_cr("C1 Runtime statistics:");
duke@435:   tty->print_cr(" _resolve_invoke_virtual_cnt:     %d", SharedRuntime::_resolve_virtual_ctr);
duke@435:   tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr);
duke@435:   tty->print_cr(" _resolve_invoke_static_cnt:      %d", SharedRuntime::_resolve_static_ctr);
duke@435:   tty->print_cr(" _handle_wrong_method_cnt:        %d", SharedRuntime::_wrong_method_ctr);
duke@435:   tty->print_cr(" _ic_miss_cnt:                    %d", SharedRuntime::_ic_miss_ctr);
duke@435:   tty->print_cr(" _generic_arraycopy_cnt:          %d", _generic_arraycopy_cnt);
duke@435:   tty->print_cr(" _primitive_arraycopy_cnt:        %d", _primitive_arraycopy_cnt);
duke@435:   tty->print_cr(" _oop_arraycopy_cnt:              %d", _oop_arraycopy_cnt);
duke@435:   tty->print_cr(" _arraycopy_slowcase_cnt:         %d", _arraycopy_slowcase_cnt);
duke@435: 
duke@435:   tty->print_cr(" _new_type_array_slowcase_cnt:    %d", _new_type_array_slowcase_cnt);
duke@435:   tty->print_cr(" _new_object_array_slowcase_cnt:  %d", _new_object_array_slowcase_cnt);
duke@435:   tty->print_cr(" _new_instance_slowcase_cnt:      %d", _new_instance_slowcase_cnt);
duke@435:   tty->print_cr(" _new_multi_array_slowcase_cnt:   %d", _new_multi_array_slowcase_cnt);
duke@435:   tty->print_cr(" _monitorenter_slowcase_cnt:      %d", _monitorenter_slowcase_cnt);
duke@435:   tty->print_cr(" _monitorexit_slowcase_cnt:       %d", _monitorexit_slowcase_cnt);
duke@435:   tty->print_cr(" _patch_code_slowcase_cnt:        %d", _patch_code_slowcase_cnt);
duke@435: 
duke@435:   tty->print_cr(" _throw_range_check_exception_count:            %d:", _throw_range_check_exception_count);
duke@435:   tty->print_cr(" _throw_index_exception_count:                  %d:", _throw_index_exception_count);
duke@435:   tty->print_cr(" _throw_div0_exception_count:                   %d:", _throw_div0_exception_count);
duke@435:   tty->print_cr(" _throw_null_pointer_exception_count:           %d:", _throw_null_pointer_exception_count);
duke@435:   tty->print_cr(" _throw_class_cast_exception_count:             %d:", _throw_class_cast_exception_count);
duke@435:   tty->print_cr(" _throw_incompatible_class_change_error_count:  %d:", _throw_incompatible_class_change_error_count);
duke@435:   tty->print_cr(" _throw_array_store_exception_count:            %d:", _throw_array_store_exception_count);
duke@435:   tty->print_cr(" _throw_count:                                  %d:", _throw_count);
duke@435: 
duke@435:   SharedRuntime::print_ic_miss_histogram();
duke@435:   tty->cr();
duke@435: }
duke@435: #endif // PRODUCT