| /* |
| * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "gc/shared/barrierSet.hpp" |
| #include "gc/shared/barrierSetAssembler.hpp" |
| #include "interp_masm_aarch64.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "interpreter/interpreterRuntime.hpp" |
| #include "logging/log.hpp" |
| #include "oops/arrayOop.hpp" |
| #include "oops/markWord.hpp" |
| #include "oops/method.hpp" |
| #include "oops/methodData.hpp" |
| #include "prims/jvmtiExport.hpp" |
| #include "prims/jvmtiThreadState.hpp" |
| #include "runtime/basicLock.hpp" |
| #include "runtime/biasedLocking.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "runtime/safepointMechanism.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "utilities/powerOfTwo.hpp" |
| |
| void InterpreterMacroAssembler::narrow(Register result) { |
| |
| // Get method->_constMethod->_result_type |
| ldr(rscratch1, Address(rfp, frame::interpreter_frame_method_offset * wordSize)); |
| ldr(rscratch1, Address(rscratch1, Method::const_offset())); |
| ldrb(rscratch1, Address(rscratch1, ConstMethod::result_type_offset())); |
| |
| Label done, notBool, notByte, notChar; |
| |
| // common case first |
| cmpw(rscratch1, T_INT); |
| br(Assembler::EQ, done); |
| |
| // mask integer result to narrower return type. |
| cmpw(rscratch1, T_BOOLEAN); |
| br(Assembler::NE, notBool); |
| andw(result, result, 0x1); |
| b(done); |
| |
| bind(notBool); |
| cmpw(rscratch1, T_BYTE); |
| br(Assembler::NE, notByte); |
| sbfx(result, result, 0, 8); |
| b(done); |
| |
| bind(notByte); |
| cmpw(rscratch1, T_CHAR); |
| br(Assembler::NE, notChar); |
| ubfx(result, result, 0, 16); // truncate upper 16 bits |
| b(done); |
| |
| bind(notChar); |
| sbfx(result, result, 0, 16); // sign-extend short |
| |
| // Nothing to do for T_INT |
| bind(done); |
| } |
| |
| void InterpreterMacroAssembler::jump_to_entry(address entry) { |
| assert(entry, "Entry must have been generated by now"); |
| b(entry); |
| } |
| |
| void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) { |
| if (JvmtiExport::can_pop_frame()) { |
| Label L; |
| // Initiate popframe handling only if it is not already being |
| // processed. If the flag has the popframe_processing bit set, it |
| // means that this code is called *during* popframe handling - we |
| // don't want to reenter. |
| // This method is only called just after the call into the vm in |
| // call_VM_base, so the arg registers are available. |
| ldrw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset())); |
| tbz(rscratch1, exact_log2(JavaThread::popframe_pending_bit), L); |
| tbnz(rscratch1, exact_log2(JavaThread::popframe_processing_bit), L); |
| // Call Interpreter::remove_activation_preserving_args_entry() to get the |
| // address of the same-named entrypoint in the generated interpreter code. |
| call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry)); |
| br(r0); |
| bind(L); |
| } |
| } |
| |
| |
| void InterpreterMacroAssembler::load_earlyret_value(TosState state) { |
| ldr(r2, Address(rthread, JavaThread::jvmti_thread_state_offset())); |
| const Address tos_addr(r2, JvmtiThreadState::earlyret_tos_offset()); |
| const Address oop_addr(r2, JvmtiThreadState::earlyret_oop_offset()); |
| const Address val_addr(r2, JvmtiThreadState::earlyret_value_offset()); |
| switch (state) { |
| case atos: ldr(r0, oop_addr); |
| str(zr, oop_addr); |
| verify_oop(r0, state); break; |
| case ltos: ldr(r0, val_addr); break; |
| case btos: // fall through |
| case ztos: // fall through |
| case ctos: // fall through |
| case stos: // fall through |
| case itos: ldrw(r0, val_addr); break; |
| case ftos: ldrs(v0, val_addr); break; |
| case dtos: ldrd(v0, val_addr); break; |
| case vtos: /* nothing to do */ break; |
| default : ShouldNotReachHere(); |
| } |
| // Clean up tos value in the thread object |
| movw(rscratch1, (int) ilgl); |
| strw(rscratch1, tos_addr); |
| strw(zr, val_addr); |
| } |
| |
| |
| void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) { |
| if (JvmtiExport::can_force_early_return()) { |
| Label L; |
| ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); |
| cbz(rscratch1, L); // if (thread->jvmti_thread_state() == NULL) exit; |
| |
| // Initiate earlyret handling only if it is not already being processed. |
| // If the flag has the earlyret_processing bit set, it means that this code |
| // is called *during* earlyret handling - we don't want to reenter. |
| ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_state_offset())); |
| cmpw(rscratch1, JvmtiThreadState::earlyret_pending); |
| br(Assembler::NE, L); |
| |
| // Call Interpreter::remove_activation_early_entry() to get the address of the |
| // same-named entrypoint in the generated interpreter code. |
| ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); |
| ldrw(rscratch1, Address(rscratch1, JvmtiThreadState::earlyret_tos_offset())); |
| call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), rscratch1); |
| br(r0); |
| bind(L); |
| } |
| } |
| |
| void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp( |
| Register reg, |
| int bcp_offset) { |
| assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode"); |
| ldrh(reg, Address(rbcp, bcp_offset)); |
| rev16(reg, reg); |
| } |
| |
| void InterpreterMacroAssembler::get_dispatch() { |
| uint64_t offset; |
| adrp(rdispatch, ExternalAddress((address)Interpreter::dispatch_table()), offset); |
| lea(rdispatch, Address(rdispatch, offset)); |
| } |
| |
| void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index, |
| int bcp_offset, |
| size_t index_size) { |
| assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); |
| if (index_size == sizeof(u2)) { |
| load_unsigned_short(index, Address(rbcp, bcp_offset)); |
| } else if (index_size == sizeof(u4)) { |
| // assert(EnableInvokeDynamic, "giant index used only for JSR 292"); |
| ldrw(index, Address(rbcp, bcp_offset)); |
| // Check if the secondary index definition is still ~x, otherwise |
| // we have to change the following assembler code to calculate the |
| // plain index. |
| assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line"); |
| eonw(index, index, zr); // convert to plain index |
| } else if (index_size == sizeof(u1)) { |
| load_unsigned_byte(index, Address(rbcp, bcp_offset)); |
| } else { |
| ShouldNotReachHere(); |
| } |
| } |
| |
| // Return |
| // Rindex: index into constant pool |
| // Rcache: address of cache entry - ConstantPoolCache::base_offset() |
| // |
| // A caller must add ConstantPoolCache::base_offset() to Rcache to get |
| // the true address of the cache entry. |
| // |
| void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, |
| Register index, |
| int bcp_offset, |
| size_t index_size) { |
| assert_different_registers(cache, index); |
| assert_different_registers(cache, rcpool); |
| get_cache_index_at_bcp(index, bcp_offset, index_size); |
| assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); |
| // convert from field index to ConstantPoolCacheEntry |
| // aarch64 already has the cache in rcpool so there is no need to |
| // install it in cache. instead we pre-add the indexed offset to |
| // rcpool and return it in cache. All clients of this method need to |
| // be modified accordingly. |
| add(cache, rcpool, index, Assembler::LSL, 5); |
| } |
| |
| |
| void InterpreterMacroAssembler::get_cache_and_index_and_bytecode_at_bcp(Register cache, |
| Register index, |
| Register bytecode, |
| int byte_no, |
| int bcp_offset, |
| size_t index_size) { |
| get_cache_and_index_at_bcp(cache, index, bcp_offset, index_size); |
| // We use a 32-bit load here since the layout of 64-bit words on |
| // little-endian machines allow us that. |
| // n.b. unlike x86 cache already includes the index offset |
| lea(bytecode, Address(cache, |
| ConstantPoolCache::base_offset() |
| + ConstantPoolCacheEntry::indices_offset())); |
| ldarw(bytecode, bytecode); |
| const int shift_count = (1 + byte_no) * BitsPerByte; |
| ubfx(bytecode, bytecode, shift_count, BitsPerByte); |
| } |
| |
| void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, |
| Register tmp, |
| int bcp_offset, |
| size_t index_size) { |
| assert(cache != tmp, "must use different register"); |
| get_cache_index_at_bcp(tmp, bcp_offset, index_size); |
| assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below"); |
| // convert from field index to ConstantPoolCacheEntry index |
| // and from word offset to byte offset |
| assert(exact_log2(in_bytes(ConstantPoolCacheEntry::size_in_bytes())) == 2 + LogBytesPerWord, "else change next line"); |
| ldr(cache, Address(rfp, frame::interpreter_frame_cache_offset * wordSize)); |
| // skip past the header |
| add(cache, cache, in_bytes(ConstantPoolCache::base_offset())); |
| add(cache, cache, tmp, Assembler::LSL, 2 + LogBytesPerWord); // construct pointer to cache entry |
| } |
| |
| void InterpreterMacroAssembler::get_method_counters(Register method, |
| Register mcs, Label& skip) { |
| Label has_counters; |
| ldr(mcs, Address(method, Method::method_counters_offset())); |
| cbnz(mcs, has_counters); |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime::build_method_counters), method); |
| ldr(mcs, Address(method, Method::method_counters_offset())); |
| cbz(mcs, skip); // No MethodCounters allocated, OutOfMemory |
| bind(has_counters); |
| } |
| |
| // Load object from cpool->resolved_references(index) |
| void InterpreterMacroAssembler::load_resolved_reference_at_index( |
| Register result, Register index, Register tmp) { |
| assert_different_registers(result, index); |
| |
| get_constant_pool(result); |
| // load pointer for resolved_references[] objArray |
| ldr(result, Address(result, ConstantPool::cache_offset_in_bytes())); |
| ldr(result, Address(result, ConstantPoolCache::resolved_references_offset_in_bytes())); |
| resolve_oop_handle(result, tmp); |
| // Add in the index |
| add(index, index, arrayOopDesc::base_offset_in_bytes(T_OBJECT) >> LogBytesPerHeapOop); |
| load_heap_oop(result, Address(result, index, Address::uxtw(LogBytesPerHeapOop))); |
| } |
| |
| void InterpreterMacroAssembler::load_resolved_klass_at_offset( |
| Register cpool, Register index, Register klass, Register temp) { |
| add(temp, cpool, index, LSL, LogBytesPerWord); |
| ldrh(temp, Address(temp, sizeof(ConstantPool))); // temp = resolved_klass_index |
| ldr(klass, Address(cpool, ConstantPool::resolved_klasses_offset_in_bytes())); // klass = cpool->_resolved_klasses |
| add(klass, klass, temp, LSL, LogBytesPerWord); |
| ldr(klass, Address(klass, Array<Klass*>::base_offset_in_bytes())); |
| } |
| |
| void InterpreterMacroAssembler::load_resolved_method_at_index(int byte_no, |
| Register method, |
| Register cache) { |
| const int method_offset = in_bytes( |
| ConstantPoolCache::base_offset() + |
| ((byte_no == TemplateTable::f2_byte) |
| ? ConstantPoolCacheEntry::f2_offset() |
| : ConstantPoolCacheEntry::f1_offset())); |
| |
| ldr(method, Address(cache, method_offset)); // get f1 Method* |
| } |
| |
| // Generate a subtype check: branch to ok_is_subtype if sub_klass is a |
| // subtype of super_klass. |
| // |
| // Args: |
| // r0: superklass |
| // Rsub_klass: subklass |
| // |
| // Kills: |
| // r2, r5 |
| void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass, |
| Label& ok_is_subtype) { |
| assert(Rsub_klass != r0, "r0 holds superklass"); |
| assert(Rsub_klass != r2, "r2 holds 2ndary super array length"); |
| assert(Rsub_klass != r5, "r5 holds 2ndary super array scan ptr"); |
| |
| // Profile the not-null value's klass. |
| profile_typecheck(r2, Rsub_klass, r5); // blows r2, reloads r5 |
| |
| // Do the check. |
| check_klass_subtype(Rsub_klass, r0, r2, ok_is_subtype); // blows r2 |
| |
| // Profile the failure of the check. |
| profile_typecheck_failed(r2); // blows r2 |
| } |
| |
| // Java Expression Stack |
| |
| void InterpreterMacroAssembler::pop_ptr(Register r) { |
| ldr(r, post(esp, wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::pop_i(Register r) { |
| ldrw(r, post(esp, wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::pop_l(Register r) { |
| ldr(r, post(esp, 2 * Interpreter::stackElementSize)); |
| } |
| |
| void InterpreterMacroAssembler::push_ptr(Register r) { |
| str(r, pre(esp, -wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::push_i(Register r) { |
| str(r, pre(esp, -wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::push_l(Register r) { |
| str(zr, pre(esp, -wordSize)); |
| str(r, pre(esp, - wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::pop_f(FloatRegister r) { |
| ldrs(r, post(esp, wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::pop_d(FloatRegister r) { |
| ldrd(r, post(esp, 2 * Interpreter::stackElementSize)); |
| } |
| |
| void InterpreterMacroAssembler::push_f(FloatRegister r) { |
| strs(r, pre(esp, -wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::push_d(FloatRegister r) { |
| strd(r, pre(esp, 2* -wordSize)); |
| } |
| |
| void InterpreterMacroAssembler::pop(TosState state) { |
| switch (state) { |
| case atos: pop_ptr(); break; |
| case btos: |
| case ztos: |
| case ctos: |
| case stos: |
| case itos: pop_i(); break; |
| case ltos: pop_l(); break; |
| case ftos: pop_f(); break; |
| case dtos: pop_d(); break; |
| case vtos: /* nothing to do */ break; |
| default: ShouldNotReachHere(); |
| } |
| verify_oop(r0, state); |
| } |
| |
| void InterpreterMacroAssembler::push(TosState state) { |
| verify_oop(r0, state); |
| switch (state) { |
| case atos: push_ptr(); break; |
| case btos: |
| case ztos: |
| case ctos: |
| case stos: |
| case itos: push_i(); break; |
| case ltos: push_l(); break; |
| case ftos: push_f(); break; |
| case dtos: push_d(); break; |
| case vtos: /* nothing to do */ break; |
| default : ShouldNotReachHere(); |
| } |
| } |
| |
| // Helpers for swap and dup |
| void InterpreterMacroAssembler::load_ptr(int n, Register val) { |
| ldr(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); |
| } |
| |
| void InterpreterMacroAssembler::store_ptr(int n, Register val) { |
| str(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); |
| } |
| |
| void InterpreterMacroAssembler::load_float(Address src) { |
| ldrs(v0, src); |
| } |
| |
| void InterpreterMacroAssembler::load_double(Address src) { |
| ldrd(v0, src); |
| } |
| |
| void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() { |
| // set sender sp |
| mov(r13, sp); |
| // record last_sp |
| str(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); |
| } |
| |
| // Jump to from_interpreted entry of a call unless single stepping is possible |
| // in this thread in which case we must call the i2i entry |
| void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) { |
| prepare_to_jump_from_interpreted(); |
| |
| if (JvmtiExport::can_post_interpreter_events()) { |
| Label run_compiled_code; |
| // JVMTI events, such as single-stepping, are implemented partly by avoiding running |
| // compiled code in threads for which the event is enabled. Check here for |
| // interp_only_mode if these events CAN be enabled. |
| ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); |
| cbzw(rscratch1, run_compiled_code); |
| ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); |
| br(rscratch1); |
| bind(run_compiled_code); |
| } |
| |
| ldr(rscratch1, Address(method, Method::from_interpreted_offset())); |
| br(rscratch1); |
| } |
| |
| // The following two routines provide a hook so that an implementation |
| // can schedule the dispatch in two parts. amd64 does not do this. |
| void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) { |
| } |
| |
| void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) { |
| dispatch_next(state, step); |
| } |
| |
| void InterpreterMacroAssembler::dispatch_base(TosState state, |
| address* table, |
| bool verifyoop, |
| bool generate_poll) { |
| if (VerifyActivationFrameSize) { |
| Unimplemented(); |
| } |
| if (verifyoop) { |
| verify_oop(r0, state); |
| } |
| |
| Label safepoint; |
| address* const safepoint_table = Interpreter::safept_table(state); |
| bool needs_thread_local_poll = generate_poll && table != safepoint_table; |
| |
| if (needs_thread_local_poll) { |
| NOT_PRODUCT(block_comment("Thread-local Safepoint poll")); |
| ldr(rscratch2, Address(rthread, Thread::polling_word_offset())); |
| tbnz(rscratch2, exact_log2(SafepointMechanism::poll_bit()), safepoint); |
| } |
| |
| if (table == Interpreter::dispatch_table(state)) { |
| addw(rscratch2, rscratch1, Interpreter::distance_from_dispatch_table(state)); |
| ldr(rscratch2, Address(rdispatch, rscratch2, Address::uxtw(3))); |
| } else { |
| mov(rscratch2, (address)table); |
| ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3))); |
| } |
| br(rscratch2); |
| |
| if (needs_thread_local_poll) { |
| bind(safepoint); |
| lea(rscratch2, ExternalAddress((address)safepoint_table)); |
| ldr(rscratch2, Address(rscratch2, rscratch1, Address::uxtw(3))); |
| br(rscratch2); |
| } |
| } |
| |
| void InterpreterMacroAssembler::dispatch_only(TosState state, bool generate_poll) { |
| dispatch_base(state, Interpreter::dispatch_table(state), true, generate_poll); |
| } |
| |
| void InterpreterMacroAssembler::dispatch_only_normal(TosState state) { |
| dispatch_base(state, Interpreter::normal_table(state)); |
| } |
| |
| void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) { |
| dispatch_base(state, Interpreter::normal_table(state), false); |
| } |
| |
| |
| void InterpreterMacroAssembler::dispatch_next(TosState state, int step, bool generate_poll) { |
| // load next bytecode |
| ldrb(rscratch1, Address(pre(rbcp, step))); |
| dispatch_base(state, Interpreter::dispatch_table(state), generate_poll); |
| } |
| |
| void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { |
| // load current bytecode |
| ldrb(rscratch1, Address(rbcp, 0)); |
| dispatch_base(state, table); |
| } |
| |
| // remove activation |
| // |
| // Apply stack watermark barrier. |
| // Unlock the receiver if this is a synchronized method. |
| // Unlock any Java monitors from syncronized blocks. |
| // Remove the activation from the stack. |
| // |
| // If there are locked Java monitors |
| // If throw_monitor_exception |
| // throws IllegalMonitorStateException |
| // Else if install_monitor_exception |
| // installs IllegalMonitorStateException |
| // Else |
| // no error processing |
| void InterpreterMacroAssembler::remove_activation( |
| TosState state, |
| bool throw_monitor_exception, |
| bool install_monitor_exception, |
| bool notify_jvmdi) { |
| // Note: Registers r3 xmm0 may be in use for the |
| // result check if synchronized method |
| Label unlocked, unlock, no_unlock; |
| |
| // The below poll is for the stack watermark barrier. It allows fixing up frames lazily, |
| // that would normally not be safe to use. Such bad returns into unsafe territory of |
| // the stack, will call InterpreterRuntime::at_unwind. |
| Label slow_path; |
| Label fast_path; |
| safepoint_poll(slow_path, true /* at_return */, false /* acquire */, false /* in_nmethod */); |
| br(Assembler::AL, fast_path); |
| bind(slow_path); |
| push(state); |
| set_last_Java_frame(esp, rfp, (address)pc(), rscratch1); |
| super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::at_unwind), rthread); |
| reset_last_Java_frame(true); |
| pop(state); |
| bind(fast_path); |
| |
| // get the value of _do_not_unlock_if_synchronized into r3 |
| const Address do_not_unlock_if_synchronized(rthread, |
| in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); |
| ldrb(r3, do_not_unlock_if_synchronized); |
| strb(zr, do_not_unlock_if_synchronized); // reset the flag |
| |
| // get method access flags |
| ldr(r1, Address(rfp, frame::interpreter_frame_method_offset * wordSize)); |
| ldr(r2, Address(r1, Method::access_flags_offset())); |
| tbz(r2, exact_log2(JVM_ACC_SYNCHRONIZED), unlocked); |
| |
| // Don't unlock anything if the _do_not_unlock_if_synchronized flag |
| // is set. |
| cbnz(r3, no_unlock); |
| |
| // unlock monitor |
| push(state); // save result |
| |
| // BasicObjectLock will be first in list, since this is a |
| // synchronized method. However, need to check that the object has |
| // not been unlocked by an explicit monitorexit bytecode. |
| const Address monitor(rfp, frame::interpreter_frame_initial_sp_offset * |
| wordSize - (int) sizeof(BasicObjectLock)); |
| // We use c_rarg1 so that if we go slow path it will be the correct |
| // register for unlock_object to pass to VM directly |
| lea(c_rarg1, monitor); // address of first monitor |
| |
| ldr(r0, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); |
| cbnz(r0, unlock); |
| |
| pop(state); |
| if (throw_monitor_exception) { |
| // Entry already unlocked, need to throw exception |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime::throw_illegal_monitor_state_exception)); |
| should_not_reach_here(); |
| } else { |
| // Monitor already unlocked during a stack unroll. If requested, |
| // install an illegal_monitor_state_exception. Continue with |
| // stack unrolling. |
| if (install_monitor_exception) { |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime::new_illegal_monitor_state_exception)); |
| } |
| b(unlocked); |
| } |
| |
| bind(unlock); |
| unlock_object(c_rarg1); |
| pop(state); |
| |
| // Check that for block-structured locking (i.e., that all locked |
| // objects has been unlocked) |
| bind(unlocked); |
| |
| // r0: Might contain return value |
| |
| // Check that all monitors are unlocked |
| { |
| Label loop, exception, entry, restart; |
| const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; |
| const Address monitor_block_top( |
| rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize); |
| const Address monitor_block_bot( |
| rfp, frame::interpreter_frame_initial_sp_offset * wordSize); |
| |
| bind(restart); |
| // We use c_rarg1 so that if we go slow path it will be the correct |
| // register for unlock_object to pass to VM directly |
| ldr(c_rarg1, monitor_block_top); // points to current entry, starting |
| // with top-most entry |
| lea(r19, monitor_block_bot); // points to word before bottom of |
| // monitor block |
| b(entry); |
| |
| // Entry already locked, need to throw exception |
| bind(exception); |
| |
| if (throw_monitor_exception) { |
| // Throw exception |
| MacroAssembler::call_VM(noreg, |
| CAST_FROM_FN_PTR(address, InterpreterRuntime:: |
| throw_illegal_monitor_state_exception)); |
| should_not_reach_here(); |
| } else { |
| // Stack unrolling. Unlock object and install illegal_monitor_exception. |
| // Unlock does not block, so don't have to worry about the frame. |
| // We don't have to preserve c_rarg1 since we are going to throw an exception. |
| |
| push(state); |
| unlock_object(c_rarg1); |
| pop(state); |
| |
| if (install_monitor_exception) { |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime:: |
| new_illegal_monitor_state_exception)); |
| } |
| |
| b(restart); |
| } |
| |
| bind(loop); |
| // check if current entry is used |
| ldr(rscratch1, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); |
| cbnz(rscratch1, exception); |
| |
| add(c_rarg1, c_rarg1, entry_size); // otherwise advance to next entry |
| bind(entry); |
| cmp(c_rarg1, r19); // check if bottom reached |
| br(Assembler::NE, loop); // if not at bottom then check this entry |
| } |
| |
| bind(no_unlock); |
| |
| // jvmti support |
| if (notify_jvmdi) { |
| notify_method_exit(state, NotifyJVMTI); // preserve TOSCA |
| } else { |
| notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA |
| } |
| |
| // remove activation |
| // get sender esp |
| ldr(esp, |
| Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); |
| if (StackReservedPages > 0) { |
| // testing if reserved zone needs to be re-enabled |
| Label no_reserved_zone_enabling; |
| |
| ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset())); |
| cmp(esp, rscratch1); |
| br(Assembler::LS, no_reserved_zone_enabling); |
| |
| call_VM_leaf( |
| CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), rthread); |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime::throw_delayed_StackOverflowError)); |
| should_not_reach_here(); |
| |
| bind(no_reserved_zone_enabling); |
| } |
| // remove frame anchor |
| leave(); |
| // If we're returning to interpreted code we will shortly be |
| // adjusting SP to allow some space for ESP. If we're returning to |
| // compiled code the saved sender SP was saved in sender_sp, so this |
| // restores it. |
| andr(sp, esp, -16); |
| } |
| |
| // Lock object |
| // |
| // Args: |
| // c_rarg1: BasicObjectLock to be used for locking |
| // |
| // Kills: |
| // r0 |
| // c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs) |
| // rscratch1, rscratch2 (scratch regs) |
| void InterpreterMacroAssembler::lock_object(Register lock_reg) |
| { |
| assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1"); |
| if (UseHeavyMonitors) { |
| call_VM(noreg, |
| CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), |
| lock_reg); |
| } else { |
| Label done; |
| |
| const Register swap_reg = r0; |
| const Register tmp = c_rarg2; |
| const Register obj_reg = c_rarg3; // Will contain the oop |
| |
| const int obj_offset = BasicObjectLock::obj_offset_in_bytes(); |
| const int lock_offset = BasicObjectLock::lock_offset_in_bytes (); |
| const int mark_offset = lock_offset + |
| BasicLock::displaced_header_offset_in_bytes(); |
| |
| Label slow_case; |
| |
| // Load object pointer into obj_reg %c_rarg3 |
| ldr(obj_reg, Address(lock_reg, obj_offset)); |
| |
| if (DiagnoseSyncOnPrimitiveWrappers != 0) { |
| load_klass(tmp, obj_reg); |
| ldrw(tmp, Address(tmp, Klass::access_flags_offset())); |
| tstw(tmp, JVM_ACC_IS_BOX_CLASS); |
| br(Assembler::NE, slow_case); |
| } |
| |
| if (UseBiasedLocking) { |
| biased_locking_enter(lock_reg, obj_reg, swap_reg, tmp, false, done, &slow_case); |
| } |
| |
| // Load (object->mark() | 1) into swap_reg |
| ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes())); |
| orr(swap_reg, rscratch1, 1); |
| |
| // Save (object->mark() | 1) into BasicLock's displaced header |
| str(swap_reg, Address(lock_reg, mark_offset)); |
| |
| assert(lock_offset == 0, |
| "displached header must be first word in BasicObjectLock"); |
| |
| Label fail; |
| if (PrintBiasedLockingStatistics) { |
| Label fast; |
| cmpxchg_obj_header(swap_reg, lock_reg, obj_reg, rscratch1, fast, &fail); |
| bind(fast); |
| atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), |
| rscratch2, rscratch1, tmp); |
| b(done); |
| bind(fail); |
| } else { |
| cmpxchg_obj_header(swap_reg, lock_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); |
| } |
| |
| // Test if the oopMark is an obvious stack pointer, i.e., |
| // 1) (mark & 7) == 0, and |
| // 2) rsp <= mark < mark + os::pagesize() |
| // |
| // These 3 tests can be done by evaluating the following |
| // expression: ((mark - rsp) & (7 - os::vm_page_size())), |
| // assuming both stack pointer and pagesize have their |
| // least significant 3 bits clear. |
| // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg |
| // NOTE2: aarch64 does not like to subtract sp from rn so take a |
| // copy |
| mov(rscratch1, sp); |
| sub(swap_reg, swap_reg, rscratch1); |
| ands(swap_reg, swap_reg, (uint64_t)(7 - os::vm_page_size())); |
| |
| // Save the test result, for recursive case, the result is zero |
| str(swap_reg, Address(lock_reg, mark_offset)); |
| |
| if (PrintBiasedLockingStatistics) { |
| br(Assembler::NE, slow_case); |
| atomic_incw(Address((address)BiasedLocking::fast_path_entry_count_addr()), |
| rscratch2, rscratch1, tmp); |
| } |
| br(Assembler::EQ, done); |
| |
| bind(slow_case); |
| |
| // Call the runtime routine for slow case |
| call_VM(noreg, |
| CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), |
| lock_reg); |
| |
| bind(done); |
| } |
| } |
| |
| |
| // Unlocks an object. Used in monitorexit bytecode and |
| // remove_activation. Throws an IllegalMonitorException if object is |
| // not locked by current thread. |
| // |
| // Args: |
| // c_rarg1: BasicObjectLock for lock |
| // |
| // Kills: |
| // r0 |
| // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs) |
| // rscratch1, rscratch2 (scratch regs) |
| void InterpreterMacroAssembler::unlock_object(Register lock_reg) |
| { |
| assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1"); |
| |
| if (UseHeavyMonitors) { |
| call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg); |
| } else { |
| Label done; |
| |
| const Register swap_reg = r0; |
| const Register header_reg = c_rarg2; // Will contain the old oopMark |
| const Register obj_reg = c_rarg3; // Will contain the oop |
| |
| save_bcp(); // Save in case of exception |
| |
| // Convert from BasicObjectLock structure to object and BasicLock |
| // structure Store the BasicLock address into %r0 |
| lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); |
| |
| // Load oop into obj_reg(%c_rarg3) |
| ldr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); |
| |
| // Free entry |
| str(zr, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); |
| |
| if (UseBiasedLocking) { |
| biased_locking_exit(obj_reg, header_reg, done); |
| } |
| |
| // Load the old header from BasicLock structure |
| ldr(header_reg, Address(swap_reg, |
| BasicLock::displaced_header_offset_in_bytes())); |
| |
| // Test for recursion |
| cbz(header_reg, done); |
| |
| // Atomic swap back the old header |
| cmpxchg_obj_header(swap_reg, header_reg, obj_reg, rscratch1, done, /*fallthrough*/NULL); |
| |
| // Call the runtime routine for slow case. |
| str(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes())); // restore obj |
| call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg); |
| |
| bind(done); |
| |
| restore_bcp(); |
| } |
| } |
| |
| void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, |
| Label& zero_continue) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| ldr(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| cbz(mdp, zero_continue); |
| } |
| |
| // Set the method data pointer for the current bcp. |
| void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| Label set_mdp; |
| stp(r0, r1, Address(pre(sp, -2 * wordSize))); |
| |
| // Test MDO to avoid the call if it is NULL. |
| ldr(r0, Address(rmethod, in_bytes(Method::method_data_offset()))); |
| cbz(r0, set_mdp); |
| call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rmethod, rbcp); |
| // r0: mdi |
| // mdo is guaranteed to be non-zero here, we checked for it before the call. |
| ldr(r1, Address(rmethod, in_bytes(Method::method_data_offset()))); |
| lea(r1, Address(r1, in_bytes(MethodData::data_offset()))); |
| add(r0, r1, r0); |
| str(r0, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| bind(set_mdp); |
| ldp(r0, r1, Address(post(sp, 2 * wordSize))); |
| } |
| |
| void InterpreterMacroAssembler::verify_method_data_pointer() { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| #ifdef ASSERT |
| Label verify_continue; |
| stp(r0, r1, Address(pre(sp, -2 * wordSize))); |
| stp(r2, r3, Address(pre(sp, -2 * wordSize))); |
| test_method_data_pointer(r3, verify_continue); // If mdp is zero, continue |
| get_method(r1); |
| |
| // If the mdp is valid, it will point to a DataLayout header which is |
| // consistent with the bcp. The converse is highly probable also. |
| ldrsh(r2, Address(r3, in_bytes(DataLayout::bci_offset()))); |
| ldr(rscratch1, Address(r1, Method::const_offset())); |
| add(r2, r2, rscratch1, Assembler::LSL); |
| lea(r2, Address(r2, ConstMethod::codes_offset())); |
| cmp(r2, rbcp); |
| br(Assembler::EQ, verify_continue); |
| // r1: method |
| // rbcp: bcp // rbcp == 22 |
| // r3: mdp |
| call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), |
| r1, rbcp, r3); |
| bind(verify_continue); |
| ldp(r2, r3, Address(post(sp, 2 * wordSize))); |
| ldp(r0, r1, Address(post(sp, 2 * wordSize))); |
| #endif // ASSERT |
| } |
| |
| |
| void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, |
| int constant, |
| Register value) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| Address data(mdp_in, constant); |
| str(value, data); |
| } |
| |
| |
| void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, |
| int constant, |
| bool decrement) { |
| increment_mdp_data_at(mdp_in, noreg, constant, decrement); |
| } |
| |
| void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, |
| Register reg, |
| int constant, |
| bool decrement) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| // %%% this does 64bit counters at best it is wasting space |
| // at worst it is a rare bug when counters overflow |
| |
| assert_different_registers(rscratch2, rscratch1, mdp_in, reg); |
| |
| Address addr1(mdp_in, constant); |
| Address addr2(rscratch2, reg, Address::lsl(0)); |
| Address &addr = addr1; |
| if (reg != noreg) { |
| lea(rscratch2, addr1); |
| addr = addr2; |
| } |
| |
| if (decrement) { |
| // Decrement the register. Set condition codes. |
| // Intel does this |
| // addptr(data, (int32_t) -DataLayout::counter_increment); |
| // If the decrement causes the counter to overflow, stay negative |
| // Label L; |
| // jcc(Assembler::negative, L); |
| // addptr(data, (int32_t) DataLayout::counter_increment); |
| // so we do this |
| ldr(rscratch1, addr); |
| subs(rscratch1, rscratch1, (unsigned)DataLayout::counter_increment); |
| Label L; |
| br(Assembler::LO, L); // skip store if counter underflow |
| str(rscratch1, addr); |
| bind(L); |
| } else { |
| assert(DataLayout::counter_increment == 1, |
| "flow-free idiom only works with 1"); |
| // Intel does this |
| // Increment the register. Set carry flag. |
| // addptr(data, DataLayout::counter_increment); |
| // If the increment causes the counter to overflow, pull back by 1. |
| // sbbptr(data, (int32_t)0); |
| // so we do this |
| ldr(rscratch1, addr); |
| adds(rscratch1, rscratch1, DataLayout::counter_increment); |
| Label L; |
| br(Assembler::CS, L); // skip store if counter overflow |
| str(rscratch1, addr); |
| bind(L); |
| } |
| } |
| |
| void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in, |
| int flag_byte_constant) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| int flags_offset = in_bytes(DataLayout::flags_offset()); |
| // Set the flag |
| ldrb(rscratch1, Address(mdp_in, flags_offset)); |
| orr(rscratch1, rscratch1, flag_byte_constant); |
| strb(rscratch1, Address(mdp_in, flags_offset)); |
| } |
| |
| |
| void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in, |
| int offset, |
| Register value, |
| Register test_value_out, |
| Label& not_equal_continue) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| if (test_value_out == noreg) { |
| ldr(rscratch1, Address(mdp_in, offset)); |
| cmp(value, rscratch1); |
| } else { |
| // Put the test value into a register, so caller can use it: |
| ldr(test_value_out, Address(mdp_in, offset)); |
| cmp(value, test_value_out); |
| } |
| br(Assembler::NE, not_equal_continue); |
| } |
| |
| |
| void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, |
| int offset_of_disp) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| ldr(rscratch1, Address(mdp_in, offset_of_disp)); |
| add(mdp_in, mdp_in, rscratch1, LSL); |
| str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| } |
| |
| |
| void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, |
| Register reg, |
| int offset_of_disp) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| lea(rscratch1, Address(mdp_in, offset_of_disp)); |
| ldr(rscratch1, Address(rscratch1, reg, Address::lsl(0))); |
| add(mdp_in, mdp_in, rscratch1, LSL); |
| str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| } |
| |
| |
| void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, |
| int constant) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| add(mdp_in, mdp_in, (unsigned)constant); |
| str(mdp_in, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| } |
| |
| |
| void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { |
| assert(ProfileInterpreter, "must be profiling interpreter"); |
| // save/restore across call_VM |
| stp(zr, return_bci, Address(pre(sp, -2 * wordSize))); |
| call_VM(noreg, |
| CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), |
| return_bci); |
| ldp(zr, return_bci, Address(post(sp, 2 * wordSize))); |
| } |
| |
| |
| void InterpreterMacroAssembler::profile_taken_branch(Register mdp, |
| Register bumped_count) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| // Otherwise, assign to mdp |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // We are taking a branch. Increment the taken count. |
| // We inline increment_mdp_data_at to return bumped_count in a register |
| //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset())); |
| Address data(mdp, in_bytes(JumpData::taken_offset())); |
| ldr(bumped_count, data); |
| assert(DataLayout::counter_increment == 1, |
| "flow-free idiom only works with 1"); |
| // Intel does this to catch overflow |
| // addptr(bumped_count, DataLayout::counter_increment); |
| // sbbptr(bumped_count, 0); |
| // so we do this |
| adds(bumped_count, bumped_count, DataLayout::counter_increment); |
| Label L; |
| br(Assembler::CS, L); // skip store if counter overflow |
| str(bumped_count, data); |
| bind(L); |
| // The method data pointer needs to be updated to reflect the new target. |
| update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset())); |
| bind(profile_continue); |
| } |
| } |
| |
| |
| void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // We are taking a branch. Increment the not taken count. |
| increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset())); |
| |
| // The method data pointer needs to be updated to correspond to |
| // the next bytecode |
| update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size())); |
| bind(profile_continue); |
| } |
| } |
| |
| |
| void InterpreterMacroAssembler::profile_call(Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // We are making a call. Increment the count. |
| increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); |
| |
| // The method data pointer needs to be updated to reflect the new target. |
| update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size())); |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_final_call(Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // We are making a call. Increment the count. |
| increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); |
| |
| // The method data pointer needs to be updated to reflect the new target. |
| update_mdp_by_constant(mdp, |
| in_bytes(VirtualCallData:: |
| virtual_call_data_size())); |
| bind(profile_continue); |
| } |
| } |
| |
| |
| void InterpreterMacroAssembler::profile_virtual_call(Register receiver, |
| Register mdp, |
| Register reg2, |
| bool receiver_can_be_null) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| Label skip_receiver_profile; |
| if (receiver_can_be_null) { |
| Label not_null; |
| // We are making a call. Increment the count for null receiver. |
| increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); |
| b(skip_receiver_profile); |
| bind(not_null); |
| } |
| |
| // Record the receiver type. |
| record_klass_in_profile(receiver, mdp, reg2, true); |
| bind(skip_receiver_profile); |
| |
| // The method data pointer needs to be updated to reflect the new target. |
| update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size())); |
| bind(profile_continue); |
| } |
| } |
| |
| // This routine creates a state machine for updating the multi-row |
| // type profile at a virtual call site (or other type-sensitive bytecode). |
| // The machine visits each row (of receiver/count) until the receiver type |
| // is found, or until it runs out of rows. At the same time, it remembers |
| // the location of the first empty row. (An empty row records null for its |
| // receiver, and can be allocated for a newly-observed receiver type.) |
| // Because there are two degrees of freedom in the state, a simple linear |
| // search will not work; it must be a decision tree. Hence this helper |
| // function is recursive, to generate the required tree structured code. |
| // It's the interpreter, so we are trading off code space for speed. |
| // See below for example code. |
| void InterpreterMacroAssembler::record_klass_in_profile_helper( |
| Register receiver, Register mdp, |
| Register reg2, int start_row, |
| Label& done, bool is_virtual_call) { |
| if (TypeProfileWidth == 0) { |
| if (is_virtual_call) { |
| increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); |
| } |
| #if INCLUDE_JVMCI |
| else if (EnableJVMCI) { |
| increment_mdp_data_at(mdp, in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset())); |
| } |
| #endif // INCLUDE_JVMCI |
| } else { |
| int non_profiled_offset = -1; |
| if (is_virtual_call) { |
| non_profiled_offset = in_bytes(CounterData::count_offset()); |
| } |
| #if INCLUDE_JVMCI |
| else if (EnableJVMCI) { |
| non_profiled_offset = in_bytes(ReceiverTypeData::nonprofiled_receiver_count_offset()); |
| } |
| #endif // INCLUDE_JVMCI |
| |
| record_item_in_profile_helper(receiver, mdp, reg2, 0, done, TypeProfileWidth, |
| &VirtualCallData::receiver_offset, &VirtualCallData::receiver_count_offset, non_profiled_offset); |
| } |
| } |
| |
| void InterpreterMacroAssembler::record_item_in_profile_helper(Register item, Register mdp, |
| Register reg2, int start_row, Label& done, int total_rows, |
| OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn, |
| int non_profiled_offset) { |
| int last_row = total_rows - 1; |
| assert(start_row <= last_row, "must be work left to do"); |
| // Test this row for both the item and for null. |
| // Take any of three different outcomes: |
| // 1. found item => increment count and goto done |
| // 2. found null => keep looking for case 1, maybe allocate this cell |
| // 3. found something else => keep looking for cases 1 and 2 |
| // Case 3 is handled by a recursive call. |
| for (int row = start_row; row <= last_row; row++) { |
| Label next_test; |
| bool test_for_null_also = (row == start_row); |
| |
| // See if the item is item[n]. |
| int item_offset = in_bytes(item_offset_fn(row)); |
| test_mdp_data_at(mdp, item_offset, item, |
| (test_for_null_also ? reg2 : noreg), |
| next_test); |
| // (Reg2 now contains the item from the CallData.) |
| |
| // The item is item[n]. Increment count[n]. |
| int count_offset = in_bytes(item_count_offset_fn(row)); |
| increment_mdp_data_at(mdp, count_offset); |
| b(done); |
| bind(next_test); |
| |
| if (test_for_null_also) { |
| Label found_null; |
| // Failed the equality check on item[n]... Test for null. |
| if (start_row == last_row) { |
| // The only thing left to do is handle the null case. |
| if (non_profiled_offset >= 0) { |
| cbz(reg2, found_null); |
| // Item did not match any saved item and there is no empty row for it. |
| // Increment total counter to indicate polymorphic case. |
| increment_mdp_data_at(mdp, non_profiled_offset); |
| b(done); |
| bind(found_null); |
| } else { |
| cbnz(reg2, done); |
| } |
| break; |
| } |
| // Since null is rare, make it be the branch-taken case. |
| cbz(reg2, found_null); |
| |
| // Put all the "Case 3" tests here. |
| record_item_in_profile_helper(item, mdp, reg2, start_row + 1, done, total_rows, |
| item_offset_fn, item_count_offset_fn, non_profiled_offset); |
| |
| // Found a null. Keep searching for a matching item, |
| // but remember that this is an empty (unused) slot. |
| bind(found_null); |
| } |
| } |
| |
| // In the fall-through case, we found no matching item, but we |
| // observed the item[start_row] is NULL. |
| |
| // Fill in the item field and increment the count. |
| int item_offset = in_bytes(item_offset_fn(start_row)); |
| set_mdp_data_at(mdp, item_offset, item); |
| int count_offset = in_bytes(item_count_offset_fn(start_row)); |
| mov(reg2, DataLayout::counter_increment); |
| set_mdp_data_at(mdp, count_offset, reg2); |
| if (start_row > 0) { |
| b(done); |
| } |
| } |
| |
| // Example state machine code for three profile rows: |
| // // main copy of decision tree, rooted at row[1] |
| // if (row[0].rec == rec) { row[0].incr(); goto done; } |
| // if (row[0].rec != NULL) { |
| // // inner copy of decision tree, rooted at row[1] |
| // if (row[1].rec == rec) { row[1].incr(); goto done; } |
| // if (row[1].rec != NULL) { |
| // // degenerate decision tree, rooted at row[2] |
| // if (row[2].rec == rec) { row[2].incr(); goto done; } |
| // if (row[2].rec != NULL) { count.incr(); goto done; } // overflow |
| // row[2].init(rec); goto done; |
| // } else { |
| // // remember row[1] is empty |
| // if (row[2].rec == rec) { row[2].incr(); goto done; } |
| // row[1].init(rec); goto done; |
| // } |
| // } else { |
| // // remember row[0] is empty |
| // if (row[1].rec == rec) { row[1].incr(); goto done; } |
| // if (row[2].rec == rec) { row[2].incr(); goto done; } |
| // row[0].init(rec); goto done; |
| // } |
| // done: |
| |
| void InterpreterMacroAssembler::record_klass_in_profile(Register receiver, |
| Register mdp, Register reg2, |
| bool is_virtual_call) { |
| assert(ProfileInterpreter, "must be profiling"); |
| Label done; |
| |
| record_klass_in_profile_helper(receiver, mdp, reg2, 0, done, is_virtual_call); |
| |
| bind (done); |
| } |
| |
| void InterpreterMacroAssembler::profile_ret(Register return_bci, |
| Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| uint row; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // Update the total ret count. |
| increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); |
| |
| for (row = 0; row < RetData::row_limit(); row++) { |
| Label next_test; |
| |
| // See if return_bci is equal to bci[n]: |
| test_mdp_data_at(mdp, |
| in_bytes(RetData::bci_offset(row)), |
| return_bci, noreg, |
| next_test); |
| |
| // return_bci is equal to bci[n]. Increment the count. |
| increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row))); |
| |
| // The method data pointer needs to be updated to reflect the new target. |
| update_mdp_by_offset(mdp, |
| in_bytes(RetData::bci_displacement_offset(row))); |
| b(profile_continue); |
| bind(next_test); |
| } |
| |
| update_mdp_for_ret(return_bci); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_null_seen(Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| set_mdp_flag_at(mdp, BitData::null_seen_byte_constant()); |
| |
| // The method data pointer needs to be updated. |
| int mdp_delta = in_bytes(BitData::bit_data_size()); |
| if (TypeProfileCasts) { |
| mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); |
| } |
| update_mdp_by_constant(mdp, mdp_delta); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) { |
| if (ProfileInterpreter && TypeProfileCasts) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| int count_offset = in_bytes(CounterData::count_offset()); |
| // Back up the address, since we have already bumped the mdp. |
| count_offset -= in_bytes(VirtualCallData::virtual_call_data_size()); |
| |
| // *Decrement* the counter. We expect to see zero or small negatives. |
| increment_mdp_data_at(mdp, count_offset, true); |
| |
| bind (profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // The method data pointer needs to be updated. |
| int mdp_delta = in_bytes(BitData::bit_data_size()); |
| if (TypeProfileCasts) { |
| mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size()); |
| |
| // Record the object type. |
| record_klass_in_profile(klass, mdp, reg2, false); |
| } |
| update_mdp_by_constant(mdp, mdp_delta); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_switch_default(Register mdp) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // Update the default case count |
| increment_mdp_data_at(mdp, |
| in_bytes(MultiBranchData::default_count_offset())); |
| |
| // The method data pointer needs to be updated. |
| update_mdp_by_offset(mdp, |
| in_bytes(MultiBranchData:: |
| default_displacement_offset())); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_switch_case(Register index, |
| Register mdp, |
| Register reg2) { |
| if (ProfileInterpreter) { |
| Label profile_continue; |
| |
| // If no method data exists, go to profile_continue. |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // Build the base (index * per_case_size_in_bytes()) + |
| // case_array_offset_in_bytes() |
| movw(reg2, in_bytes(MultiBranchData::per_case_size())); |
| movw(rscratch1, in_bytes(MultiBranchData::case_array_offset())); |
| Assembler::maddw(index, index, reg2, rscratch1); |
| |
| // Update the case count |
| increment_mdp_data_at(mdp, |
| index, |
| in_bytes(MultiBranchData::relative_count_offset())); |
| |
| // The method data pointer needs to be updated. |
| update_mdp_by_offset(mdp, |
| index, |
| in_bytes(MultiBranchData:: |
| relative_displacement_offset())); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { |
| if (state == atos) { |
| MacroAssembler::verify_oop(reg); |
| } |
| } |
| |
| void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { ; } |
| |
| |
| void InterpreterMacroAssembler::notify_method_entry() { |
| // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to |
| // track stack depth. If it is possible to enter interp_only_mode we add |
| // the code to check if the event should be sent. |
| if (JvmtiExport::can_post_interpreter_events()) { |
| Label L; |
| ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); |
| cbzw(r3, L); |
| call_VM(noreg, CAST_FROM_FN_PTR(address, |
| InterpreterRuntime::post_method_entry)); |
| bind(L); |
| } |
| |
| { |
| SkipIfEqual skip(this, &DTraceMethodProbes, false); |
| get_method(c_rarg1); |
| call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), |
| rthread, c_rarg1); |
| } |
| |
| // RedefineClasses() tracing support for obsolete method entry |
| if (log_is_enabled(Trace, redefine, class, obsolete)) { |
| get_method(c_rarg1); |
| call_VM_leaf( |
| CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), |
| rthread, c_rarg1); |
| } |
| |
| } |
| |
| |
| void InterpreterMacroAssembler::notify_method_exit( |
| TosState state, NotifyMethodExitMode mode) { |
| // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to |
| // track stack depth. If it is possible to enter interp_only_mode we add |
| // the code to check if the event should be sent. |
| if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) { |
| Label L; |
| // Note: frame::interpreter_frame_result has a dependency on how the |
| // method result is saved across the call to post_method_exit. If this |
| // is changed then the interpreter_frame_result implementation will |
| // need to be updated too. |
| |
| // template interpreter will leave the result on the top of the stack. |
| push(state); |
| ldrw(r3, Address(rthread, JavaThread::interp_only_mode_offset())); |
| cbz(r3, L); |
| call_VM(noreg, |
| CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); |
| bind(L); |
| pop(state); |
| } |
| |
| { |
| SkipIfEqual skip(this, &DTraceMethodProbes, false); |
| push(state); |
| get_method(c_rarg1); |
| call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), |
| rthread, c_rarg1); |
| pop(state); |
| } |
| } |
| |
| |
| // Jump if ((*counter_addr += increment) & mask) satisfies the condition. |
| void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, |
| int increment, Address mask, |
| Register scratch, Register scratch2, |
| bool preloaded, Condition cond, |
| Label* where) { |
| if (!preloaded) { |
| ldrw(scratch, counter_addr); |
| } |
| add(scratch, scratch, increment); |
| strw(scratch, counter_addr); |
| ldrw(scratch2, mask); |
| ands(scratch, scratch, scratch2); |
| br(cond, *where); |
| } |
| |
| void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point, |
| int number_of_arguments) { |
| // interpreter specific |
| // |
| // Note: No need to save/restore rbcp & rlocals pointer since these |
| // are callee saved registers and no blocking/ GC can happen |
| // in leaf calls. |
| #ifdef ASSERT |
| { |
| Label L; |
| ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); |
| cbz(rscratch1, L); |
| stop("InterpreterMacroAssembler::call_VM_leaf_base:" |
| " last_sp != NULL"); |
| bind(L); |
| } |
| #endif /* ASSERT */ |
| // super call |
| MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); |
| } |
| |
| void InterpreterMacroAssembler::call_VM_base(Register oop_result, |
| Register java_thread, |
| Register last_java_sp, |
| address entry_point, |
| int number_of_arguments, |
| bool check_exceptions) { |
| // interpreter specific |
| // |
| // Note: Could avoid restoring locals ptr (callee saved) - however doesn't |
| // really make a difference for these runtime calls, since they are |
| // slow anyway. Btw., bcp must be saved/restored since it may change |
| // due to GC. |
| // assert(java_thread == noreg , "not expecting a precomputed java thread"); |
| save_bcp(); |
| #ifdef ASSERT |
| { |
| Label L; |
| ldr(rscratch1, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); |
| cbz(rscratch1, L); |
| stop("InterpreterMacroAssembler::call_VM_leaf_base:" |
| " last_sp != NULL"); |
| bind(L); |
| } |
| #endif /* ASSERT */ |
| // super call |
| MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp, |
| entry_point, number_of_arguments, |
| check_exceptions); |
| // interpreter specific |
| restore_bcp(); |
| restore_locals(); |
| } |
| |
| void InterpreterMacroAssembler::profile_obj_type(Register obj, const Address& mdo_addr) { |
| assert_different_registers(obj, rscratch1); |
| Label update, next, none; |
| |
| verify_oop(obj); |
| |
| cbnz(obj, update); |
| orptr(mdo_addr, TypeEntries::null_seen); |
| b(next); |
| |
| bind(update); |
| load_klass(obj, obj); |
| |
| ldr(rscratch1, mdo_addr); |
| eor(obj, obj, rscratch1); |
| tst(obj, TypeEntries::type_klass_mask); |
| br(Assembler::EQ, next); // klass seen before, nothing to |
| // do. The unknown bit may have been |
| // set already but no need to check. |
| |
| tbnz(obj, exact_log2(TypeEntries::type_unknown), next); |
| // already unknown. Nothing to do anymore. |
| |
| ldr(rscratch1, mdo_addr); |
| cbz(rscratch1, none); |
| cmp(rscratch1, (u1)TypeEntries::null_seen); |
| br(Assembler::EQ, none); |
| // There is a chance that the checks above (re-reading profiling |
| // data from memory) fail if another thread has just set the |
| // profiling to this obj's klass |
| ldr(rscratch1, mdo_addr); |
| eor(obj, obj, rscratch1); |
| tst(obj, TypeEntries::type_klass_mask); |
| br(Assembler::EQ, next); |
| |
| // different than before. Cannot keep accurate profile. |
| orptr(mdo_addr, TypeEntries::type_unknown); |
| b(next); |
| |
| bind(none); |
| // first time here. Set profile type. |
| str(obj, mdo_addr); |
| |
| bind(next); |
| } |
| |
| void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) { |
| if (!ProfileInterpreter) { |
| return; |
| } |
| |
| if (MethodData::profile_arguments() || MethodData::profile_return()) { |
| Label profile_continue; |
| |
| test_method_data_pointer(mdp, profile_continue); |
| |
| int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size()); |
| |
| ldrb(rscratch1, Address(mdp, in_bytes(DataLayout::tag_offset()) - off_to_start)); |
| cmp(rscratch1, u1(is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag)); |
| br(Assembler::NE, profile_continue); |
| |
| if (MethodData::profile_arguments()) { |
| Label done; |
| int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset()); |
| |
| for (int i = 0; i < TypeProfileArgsLimit; i++) { |
| if (i > 0 || MethodData::profile_return()) { |
| // If return value type is profiled we may have no argument to profile |
| ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); |
| sub(tmp, tmp, i*TypeStackSlotEntries::per_arg_count()); |
| cmp(tmp, (u1)TypeStackSlotEntries::per_arg_count()); |
| add(rscratch1, mdp, off_to_args); |
| br(Assembler::LT, done); |
| } |
| ldr(tmp, Address(callee, Method::const_offset())); |
| load_unsigned_short(tmp, Address(tmp, ConstMethod::size_of_parameters_offset())); |
| // stack offset o (zero based) from the start of the argument |
| // list, for n arguments translates into offset n - o - 1 from |
| // the end of the argument list |
| ldr(rscratch1, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i)))); |
| sub(tmp, tmp, rscratch1); |
| sub(tmp, tmp, 1); |
| Address arg_addr = argument_address(tmp); |
| ldr(tmp, arg_addr); |
| |
| Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))); |
| profile_obj_type(tmp, mdo_arg_addr); |
| |
| int to_add = in_bytes(TypeStackSlotEntries::per_arg_size()); |
| off_to_args += to_add; |
| } |
| |
| if (MethodData::profile_return()) { |
| ldr(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::cell_count_offset()))); |
| sub(tmp, tmp, TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count()); |
| } |
| |
| add(rscratch1, mdp, off_to_args); |
| bind(done); |
| mov(mdp, rscratch1); |
| |
| if (MethodData::profile_return()) { |
| // We're right after the type profile for the last |
| // argument. tmp is the number of cells left in the |
| // CallTypeData/VirtualCallTypeData to reach its end. Non null |
| // if there's a return to profile. |
| assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type"); |
| add(mdp, mdp, tmp, LSL, exact_log2(DataLayout::cell_size)); |
| } |
| str(mdp, Address(rfp, frame::interpreter_frame_mdp_offset * wordSize)); |
| } else { |
| assert(MethodData::profile_return(), "either profile call args or call ret"); |
| update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size())); |
| } |
| |
| // mdp points right after the end of the |
| // CallTypeData/VirtualCallTypeData, right after the cells for the |
| // return value type if there's one |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) { |
| assert_different_registers(mdp, ret, tmp, rbcp); |
| if (ProfileInterpreter && MethodData::profile_return()) { |
| Label profile_continue, done; |
| |
| test_method_data_pointer(mdp, profile_continue); |
| |
| if (MethodData::profile_return_jsr292_only()) { |
| assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); |
| |
| // If we don't profile all invoke bytecodes we must make sure |
| // it's a bytecode we indeed profile. We can't go back to the |
| // begining of the ProfileData we intend to update to check its |
| // type because we're right after it and we don't known its |
| // length |
| Label do_profile; |
| ldrb(rscratch1, Address(rbcp, 0)); |
| cmp(rscratch1, (u1)Bytecodes::_invokedynamic); |
| br(Assembler::EQ, do_profile); |
| cmp(rscratch1, (u1)Bytecodes::_invokehandle); |
| br(Assembler::EQ, do_profile); |
| get_method(tmp); |
| ldrh(rscratch1, Address(tmp, Method::intrinsic_id_offset_in_bytes())); |
| subs(zr, rscratch1, vmIntrinsics::_compiledLambdaForm); |
| br(Assembler::NE, profile_continue); |
| |
| bind(do_profile); |
| } |
| |
| Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size())); |
| mov(tmp, ret); |
| profile_obj_type(tmp, mdo_ret_addr); |
| |
| bind(profile_continue); |
| } |
| } |
| |
| void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) { |
| assert_different_registers(rscratch1, rscratch2, mdp, tmp1, tmp2); |
| if (ProfileInterpreter && MethodData::profile_parameters()) { |
| Label profile_continue, done; |
| |
| test_method_data_pointer(mdp, profile_continue); |
| |
| // Load the offset of the area within the MDO used for |
| // parameters. If it's negative we're not profiling any parameters |
| ldrw(tmp1, Address(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()))); |
| tbnz(tmp1, 31, profile_continue); // i.e. sign bit set |
| |
| // Compute a pointer to the area for parameters from the offset |
| // and move the pointer to the slot for the last |
| // parameters. Collect profiling from last parameter down. |
| // mdo start + parameters offset + array length - 1 |
| add(mdp, mdp, tmp1); |
| ldr(tmp1, Address(mdp, ArrayData::array_len_offset())); |
| sub(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); |
| |
| Label loop; |
| bind(loop); |
| |
| int off_base = in_bytes(ParametersTypeData::stack_slot_offset(0)); |
| int type_base = in_bytes(ParametersTypeData::type_offset(0)); |
| int per_arg_scale = exact_log2(DataLayout::cell_size); |
| add(rscratch1, mdp, off_base); |
| add(rscratch2, mdp, type_base); |
| |
| Address arg_off(rscratch1, tmp1, Address::lsl(per_arg_scale)); |
| Address arg_type(rscratch2, tmp1, Address::lsl(per_arg_scale)); |
| |
| // load offset on the stack from the slot for this parameter |
| ldr(tmp2, arg_off); |
| neg(tmp2, tmp2); |
| // read the parameter from the local area |
| ldr(tmp2, Address(rlocals, tmp2, Address::lsl(Interpreter::logStackElementSize))); |
| |
| // profile the parameter |
| profile_obj_type(tmp2, arg_type); |
| |
| // go to next parameter |
| subs(tmp1, tmp1, TypeStackSlotEntries::per_arg_count()); |
| br(Assembler::GE, loop); |
| |
| bind(profile_continue); |
| } |
| } |
