--- /dev/null 2021-01-19 17:38:25.908523431 +0000 +++ new/src/cpu/aarch64/vm/templateInterpreter_aarch64.cpp 2021-01-25 19:31:59.416714852 +0000 @@ -0,0 +1,2065 @@ +/* + * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2013, 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.hpp" +#include "interpreter/bytecodeHistogram.hpp" +#include "interpreter/interpreter.hpp" +#include "interpreter/interpreterGenerator.hpp" +#include "interpreter/interpreterRuntime.hpp" +#include "interpreter/templateTable.hpp" +#include "interpreter/bytecodeTracer.hpp" +#include "oops/arrayOop.hpp" +#include "oops/methodData.hpp" +#include "oops/method.hpp" +#include "oops/oop.inline.hpp" +#include "prims/jvmtiExport.hpp" +#include "prims/jvmtiThreadState.hpp" +#include "runtime/arguments.hpp" +#include "runtime/deoptimization.hpp" +#include "runtime/frame.inline.hpp" +#include "runtime/sharedRuntime.hpp" +#include "runtime/stubRoutines.hpp" +#include "runtime/synchronizer.hpp" +#include "runtime/timer.hpp" +#include "runtime/vframeArray.hpp" +#include "utilities/debug.hpp" +#include + +#ifndef PRODUCT +#include "oops/method.hpp" +#endif // !PRODUCT + +#define __ _masm-> + +#ifndef CC_INTERP + +//----------------------------------------------------------------------------- + +extern "C" void entry(CodeBuffer*); + +//----------------------------------------------------------------------------- + +address TemplateInterpreterGenerator::generate_StackOverflowError_handler() { + address entry = __ pc(); + +#ifdef ASSERT + { + Label L; + __ ldr(rscratch1, Address(rfp, + frame::interpreter_frame_monitor_block_top_offset * + wordSize)); + __ mov(rscratch2, sp); + __ cmp(rscratch1, rscratch2); // maximal rsp for current rfp (stack + // grows negative) + __ br(Assembler::HS, L); // check if frame is complete + __ stop ("interpreter frame not set up"); + __ bind(L); + } +#endif // ASSERT + // Restore bcp under the assumption that the current frame is still + // interpreted + __ restore_bcp(); + + // expression stack must be empty before entering the VM if an + // exception happened + __ empty_expression_stack(); + // throw exception + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::throw_StackOverflowError)); + return entry; +} + +address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler( + const char* name) { + address entry = __ pc(); + // expression stack must be empty before entering the VM if an + // exception happened + __ empty_expression_stack(); + // setup parameters + // ??? convention: expect aberrant index in register r1 + __ movw(c_rarg2, r1); + __ mov(c_rarg1, (address)name); + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime:: + throw_ArrayIndexOutOfBoundsException), + c_rarg1, c_rarg2); + return entry; +} + +address TemplateInterpreterGenerator::generate_ClassCastException_handler() { + address entry = __ pc(); + + // object is at TOS + __ pop(c_rarg1); + + // expression stack must be empty before entering the VM if an + // exception happened + __ empty_expression_stack(); + + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime:: + throw_ClassCastException), + c_rarg1); + return entry; +} + +address TemplateInterpreterGenerator::generate_exception_handler_common( + const char* name, const char* message, bool pass_oop) { + assert(!pass_oop || message == NULL, "either oop or message but not both"); + address entry = __ pc(); + if (pass_oop) { + // object is at TOS + __ pop(c_rarg2); + } + // expression stack must be empty before entering the VM if an + // exception happened + __ empty_expression_stack(); + // setup parameters + __ lea(c_rarg1, Address((address)name)); + if (pass_oop) { + __ call_VM(r0, CAST_FROM_FN_PTR(address, + InterpreterRuntime:: + create_klass_exception), + c_rarg1, c_rarg2); + } else { + // kind of lame ExternalAddress can't take NULL because + // external_word_Relocation will assert. + if (message != NULL) { + __ lea(c_rarg2, Address((address)message)); + } else { + __ mov(c_rarg2, NULL_WORD); + } + __ call_VM(r0, + CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), + c_rarg1, c_rarg2); + } + // throw exception + __ b(address(Interpreter::throw_exception_entry())); + return entry; +} + +address TemplateInterpreterGenerator::generate_continuation_for(TosState state) { + address entry = __ pc(); + // NULL last_sp until next java call + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + __ dispatch_next(state); + return entry; +} + +address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) { + address entry = __ pc(); + + // Restore stack bottom in case i2c adjusted stack + __ ldr(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + // and NULL it as marker that esp is now tos until next java call + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + __ restore_bcp(); + __ restore_locals(); + __ restore_constant_pool_cache(); + __ get_method(rmethod); + + // Pop N words from the stack + __ get_cache_and_index_at_bcp(r1, r2, 1, index_size); + __ ldr(r1, Address(r1, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset())); + __ andr(r1, r1, ConstantPoolCacheEntry::parameter_size_mask); + + __ add(esp, esp, r1, Assembler::LSL, 3); + + // Restore machine SP + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); + __ ldrh(rscratch1, Address(rscratch1, ConstMethod::max_stack_offset())); + __ add(rscratch1, rscratch1, frame::interpreter_frame_monitor_size() + 2); + __ ldr(rscratch2, + Address(rfp, frame::interpreter_frame_initial_sp_offset * wordSize)); + __ sub(rscratch1, rscratch2, rscratch1, ext::uxtw, 3); + __ andr(sp, rscratch1, -16); + + __ get_dispatch(); + __ dispatch_next(state, step); + + return entry; +} + +address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, + int step) { + address entry = __ pc(); + __ restore_bcp(); + __ restore_locals(); + __ restore_constant_pool_cache(); + __ get_method(rmethod); + __ get_dispatch(); + + // Calculate stack limit + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); + __ ldrh(rscratch1, Address(rscratch1, ConstMethod::max_stack_offset())); + __ add(rscratch1, rscratch1, frame::interpreter_frame_monitor_size() + + (EnableInvokeDynamic ? 2 : 0)); + __ ldr(rscratch2, + Address(rfp, frame::interpreter_frame_initial_sp_offset * wordSize)); + __ sub(rscratch1, rscratch2, rscratch1, ext::uxtx, 3); + __ andr(sp, rscratch1, -16); + + // Restore expression stack pointer + __ ldr(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + // NULL last_sp until next java call + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + + // handle exceptions + { + Label L; + __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); + __ cbz(rscratch1, L); + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::throw_pending_exception)); + __ should_not_reach_here(); + __ bind(L); + } + + __ dispatch_next(state, step); + return entry; +} + + +int AbstractInterpreter::BasicType_as_index(BasicType type) { + int i = 0; + switch (type) { + case T_BOOLEAN: i = 0; break; + case T_CHAR : i = 1; break; + case T_BYTE : i = 2; break; + case T_SHORT : i = 3; break; + case T_INT : i = 4; break; + case T_LONG : i = 5; break; + case T_VOID : i = 6; break; + case T_FLOAT : i = 7; break; + case T_DOUBLE : i = 8; break; + case T_OBJECT : i = 9; break; + case T_ARRAY : i = 9; break; + default : ShouldNotReachHere(); + } + assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, + "index out of bounds"); + return i; +} + + +address TemplateInterpreterGenerator::generate_result_handler_for( + BasicType type) { + address entry = __ pc(); + switch (type) { + case T_BOOLEAN: __ c2bool(r0); break; + case T_CHAR : __ uxth(r0, r0); break; + case T_BYTE : __ sxtb(r0, r0); break; + case T_SHORT : __ sxth(r0, r0); break; + case T_INT : __ uxtw(r0, r0); break; // FIXME: We almost certainly don't need this + case T_LONG : /* nothing to do */ break; + case T_VOID : /* nothing to do */ break; + case T_FLOAT : /* nothing to do */ break; + case T_DOUBLE : /* nothing to do */ break; + case T_OBJECT : + // retrieve result from frame + __ ldr(r0, Address(rfp, frame::interpreter_frame_oop_temp_offset*wordSize)); + // and verify it + __ verify_oop(r0); + break; + default : ShouldNotReachHere(); + } + __ ret(lr); // return from result handler + return entry; +} + +address TemplateInterpreterGenerator::generate_safept_entry_for( + TosState state, + address runtime_entry) { + address entry = __ pc(); + __ push(state); + __ call_VM(noreg, runtime_entry); + __ membar(Assembler::AnyAny); + __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos)); + return entry; +} + +// Helpers for commoning out cases in the various type of method entries. +// + + +// increment invocation count & check for overflow +// +// Note: checking for negative value instead of overflow +// so we have a 'sticky' overflow test +// +// rmethod: method +// +void InterpreterGenerator::generate_counter_incr( + Label* overflow, + Label* profile_method, + Label* profile_method_continue) { + Label done; + // Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not. + if (TieredCompilation) { + int increment = InvocationCounter::count_increment; + int mask = ((1 << Tier0InvokeNotifyFreqLog) - 1) << InvocationCounter::count_shift; + Label no_mdo; + if (ProfileInterpreter) { + // Are we profiling? + __ ldr(r0, Address(rmethod, Method::method_data_offset())); + __ cbz(r0, no_mdo); + // Increment counter in the MDO + const Address mdo_invocation_counter(r0, in_bytes(MethodData::invocation_counter_offset()) + + in_bytes(InvocationCounter::counter_offset())); + __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, rscratch1, rscratch2, false, Assembler::EQ, overflow); + __ b(done); + } + __ bind(no_mdo); + // Increment counter in MethodCounters + const Address invocation_counter(rscratch2, + MethodCounters::invocation_counter_offset() + + InvocationCounter::counter_offset()); + __ get_method_counters(rmethod, rscratch2, done); + __ increment_mask_and_jump(invocation_counter, increment, mask, rscratch1, rscratch2, false, Assembler::EQ, overflow); + __ bind(done); + } else { + const Address backedge_counter(rscratch2, + MethodCounters::backedge_counter_offset() + + InvocationCounter::counter_offset()); + const Address invocation_counter(rscratch2, + MethodCounters::invocation_counter_offset() + + InvocationCounter::counter_offset()); + + __ get_method_counters(rmethod, rscratch2, done); + + if (ProfileInterpreter) { // %%% Merge this into MethodData* + __ ldrw(r1, Address(rscratch2, MethodCounters::interpreter_invocation_counter_offset())); + __ addw(r1, r1, 1); + __ strw(r1, Address(rscratch2, MethodCounters::interpreter_invocation_counter_offset())); + } + // Update standard invocation counters + __ ldrw(r1, invocation_counter); + __ ldrw(r0, backedge_counter); + + __ addw(r1, r1, InvocationCounter::count_increment); + __ andw(r0, r0, InvocationCounter::count_mask_value); + + __ strw(r1, invocation_counter); + __ addw(r0, r0, r1); // add both counters + + // profile_method is non-null only for interpreted method so + // profile_method != NULL == !native_call + + if (ProfileInterpreter && profile_method != NULL) { + // Test to see if we should create a method data oop + unsigned long offset; + __ adrp(rscratch2, ExternalAddress((address)&InvocationCounter::InterpreterProfileLimit), + offset); + __ ldrw(rscratch2, Address(rscratch2, offset)); + __ cmp(r0, rscratch2); + __ br(Assembler::LT, *profile_method_continue); + + // if no method data exists, go to profile_method + __ test_method_data_pointer(rscratch2, *profile_method); + } + + { + unsigned long offset; + __ adrp(rscratch2, + ExternalAddress((address)&InvocationCounter::InterpreterInvocationLimit), + offset); + __ ldrw(rscratch2, Address(rscratch2, offset)); + __ cmpw(r0, rscratch2); + __ br(Assembler::HS, *overflow); + } + __ bind(done); + } +} + +void InterpreterGenerator::generate_counter_overflow(Label* do_continue) { + + // Asm interpreter on entry + // On return (i.e. jump to entry_point) [ back to invocation of interpreter ] + // Everything as it was on entry + + // InterpreterRuntime::frequency_counter_overflow takes two + // arguments, the first (thread) is passed by call_VM, the second + // indicates if the counter overflow occurs at a backwards branch + // (NULL bcp). We pass zero for it. The call returns the address + // of the verified entry point for the method or NULL if the + // compilation did not complete (either went background or bailed + // out). + __ mov(c_rarg1, 0); + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::frequency_counter_overflow), + c_rarg1); + + __ b(*do_continue); +} + +// See if we've got enough room on the stack for locals plus overhead. +// The expression stack grows down incrementally, so the normal guard +// page mechanism will work for that. +// +// NOTE: Since the additional locals are also always pushed (wasn't +// obvious in generate_method_entry) so the guard should work for them +// too. +// +// Args: +// r3: number of additional locals this frame needs (what we must check) +// rmethod: Method* +// +// Kills: +// r0 +void InterpreterGenerator::generate_stack_overflow_check(void) { + + // monitor entry size: see picture of stack set + // (generate_method_entry) and frame_amd64.hpp + const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; + + // total overhead size: entry_size + (saved rbp through expr stack + // bottom). be sure to change this if you add/subtract anything + // to/from the overhead area + const int overhead_size = + -(frame::interpreter_frame_initial_sp_offset * wordSize) + entry_size; + + const int page_size = os::vm_page_size(); + + Label after_frame_check; + + // see if the frame is greater than one page in size. If so, + // then we need to verify there is enough stack space remaining + // for the additional locals. + // + // Note that we use SUBS rather than CMP here because the immediate + // field of this instruction may overflow. SUBS can cope with this + // because it is a macro that will expand to some number of MOV + // instructions and a register operation. + __ subs(rscratch1, r3, (page_size - overhead_size) / Interpreter::stackElementSize); + __ br(Assembler::LS, after_frame_check); + + // compute rsp as if this were going to be the last frame on + // the stack before the red zone + + const Address stack_base(rthread, Thread::stack_base_offset()); + const Address stack_size(rthread, Thread::stack_size_offset()); + + // locals + overhead, in bytes + __ mov(r0, overhead_size); + __ add(r0, r0, r3, Assembler::LSL, Interpreter::logStackElementSize); // 2 slots per parameter. + + __ ldr(rscratch1, stack_base); + __ ldr(rscratch2, stack_size); + +#ifdef ASSERT + Label stack_base_okay, stack_size_okay; + // verify that thread stack base is non-zero + __ cbnz(rscratch1, stack_base_okay); + __ stop("stack base is zero"); + __ bind(stack_base_okay); + // verify that thread stack size is non-zero + __ cbnz(rscratch2, stack_size_okay); + __ stop("stack size is zero"); + __ bind(stack_size_okay); +#endif + + // Add stack base to locals and subtract stack size + __ sub(rscratch1, rscratch1, rscratch2); // Stack limit + __ add(r0, r0, rscratch1); + + // Use the maximum number of pages we might bang. + const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages : + (StackRedPages+StackYellowPages); + + // add in the red and yellow zone sizes + __ add(r0, r0, max_pages * page_size * 2); + + // check against the current stack bottom + __ cmp(sp, r0); + __ br(Assembler::HI, after_frame_check); + + // Remove the incoming args, peeling the machine SP back to where it + // was in the caller. This is not strictly necessary, but unless we + // do so the stack frame may have a garbage FP; this ensures a + // correct call stack that we can always unwind. The ANDR should be + // unnecessary because the sender SP in r13 is always aligned, but + // it doesn't hurt. + __ andr(sp, r13, -16); + + // Note: the restored frame is not necessarily interpreted. + // Use the shared runtime version of the StackOverflowError. + assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated"); + __ far_jump(RuntimeAddress(StubRoutines::throw_StackOverflowError_entry())); + + // all done with frame size check + __ bind(after_frame_check); +} + +// Allocate monitor and lock method (asm interpreter) +// +// Args: +// rmethod: Method* +// rlocals: locals +// +// Kills: +// r0 +// c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs) +// rscratch1, rscratch2 (scratch regs) +void InterpreterGenerator::lock_method(void) { + // synchronize method + const Address access_flags(rmethod, Method::access_flags_offset()); + const Address monitor_block_top( + rfp, + frame::interpreter_frame_monitor_block_top_offset * wordSize); + const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; + +#ifdef ASSERT + { + Label L; + __ ldrw(r0, access_flags); + __ tst(r0, JVM_ACC_SYNCHRONIZED); + __ br(Assembler::NE, L); + __ stop("method doesn't need synchronization"); + __ bind(L); + } +#endif // ASSERT + + // get synchronization object + { + const int mirror_offset = in_bytes(Klass::java_mirror_offset()); + Label done; + __ ldrw(r0, access_flags); + __ tst(r0, JVM_ACC_STATIC); + // get receiver (assume this is frequent case) + __ ldr(r0, Address(rlocals, Interpreter::local_offset_in_bytes(0))); + __ br(Assembler::EQ, done); + __ ldr(r0, Address(rmethod, Method::const_offset())); + __ ldr(r0, Address(r0, ConstMethod::constants_offset())); + __ ldr(r0, Address(r0, + ConstantPool::pool_holder_offset_in_bytes())); + __ ldr(r0, Address(r0, mirror_offset)); + +#ifdef ASSERT + { + Label L; + __ cbnz(r0, L); + __ stop("synchronization object is NULL"); + __ bind(L); + } +#endif // ASSERT + + __ bind(done); + } + + // add space for monitor & lock + __ sub(sp, sp, entry_size); // add space for a monitor entry + __ sub(esp, esp, entry_size); + __ mov(rscratch1, esp); + __ str(rscratch1, monitor_block_top); // set new monitor block top + // store object + __ str(r0, Address(esp, BasicObjectLock::obj_offset_in_bytes())); + __ mov(c_rarg1, esp); // object address + __ lock_object(c_rarg1); +} + +// Generate a fixed interpreter frame. This is identical setup for +// interpreted methods and for native methods hence the shared code. +// +// Args: +// lr: return address +// rmethod: Method* +// rlocals: pointer to locals +// rcpool: cp cache +// stack_pointer: previous sp +void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) { + // initialize fixed part of activation frame + if (native_call) { + __ sub(esp, sp, 12 * wordSize); + __ mov(rbcp, zr); + __ stp(esp, zr, Address(__ pre(sp, -12 * wordSize))); + // add 2 zero-initialized slots for native calls + __ stp(zr, zr, Address(sp, 10 * wordSize)); + } else { + __ sub(esp, sp, 10 * wordSize); + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); // get ConstMethod + __ add(rbcp, rscratch1, in_bytes(ConstMethod::codes_offset())); // get codebase + __ stp(esp, rbcp, Address(__ pre(sp, -10 * wordSize))); + } + + if (ProfileInterpreter) { + Label method_data_continue; + __ ldr(rscratch1, Address(rmethod, Method::method_data_offset())); + __ cbz(rscratch1, method_data_continue); + __ lea(rscratch1, Address(rscratch1, in_bytes(MethodData::data_offset()))); + __ bind(method_data_continue); + __ stp(rscratch1, rmethod, Address(sp, 4 * wordSize)); // save Method* and mdp (method data pointer) + } else { + __ stp(zr, rmethod, Address(sp, 4 * wordSize)); // save Method* (no mdp) + } + + __ ldr(rcpool, Address(rmethod, Method::const_offset())); + __ ldr(rcpool, Address(rcpool, ConstMethod::constants_offset())); + __ ldr(rcpool, Address(rcpool, ConstantPool::cache_offset_in_bytes())); + __ stp(rlocals, rcpool, Address(sp, 2 * wordSize)); + + __ stp(rfp, lr, Address(sp, 8 * wordSize)); + __ lea(rfp, Address(sp, 8 * wordSize)); + + // set sender sp + // leave last_sp as null + __ stp(zr, r13, Address(sp, 6 * wordSize)); + + // Move SP out of the way + if (! native_call) { + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); + __ ldrh(rscratch1, Address(rscratch1, ConstMethod::max_stack_offset())); + __ add(rscratch1, rscratch1, frame::interpreter_frame_monitor_size() + + (EnableInvokeDynamic ? 2 : 0)); + __ sub(rscratch1, sp, rscratch1, ext::uxtw, 3); + __ andr(sp, rscratch1, -16); + } +} + +// End of helpers + +// Various method entries +//------------------------------------------------------------------------------------------------------------------------ +// +// + +// Call an accessor method (assuming it is resolved, otherwise drop +// into vanilla (slow path) entry +address InterpreterGenerator::generate_accessor_entry(void) { + return NULL; +} + +// Method entry for java.lang.ref.Reference.get. +address InterpreterGenerator::generate_Reference_get_entry(void) { +#if INCLUDE_ALL_GCS + // Code: _aload_0, _getfield, _areturn + // parameter size = 1 + // + // The code that gets generated by this routine is split into 2 parts: + // 1. The "intrinsified" code for G1 (or any SATB based GC), + // 2. The slow path - which is an expansion of the regular method entry. + // + // Notes:- + // * In the G1 code we do not check whether we need to block for + // a safepoint. If G1 is enabled then we must execute the specialized + // code for Reference.get (except when the Reference object is null) + // so that we can log the value in the referent field with an SATB + // update buffer. + // If the code for the getfield template is modified so that the + // G1 pre-barrier code is executed when the current method is + // Reference.get() then going through the normal method entry + // will be fine. + // * The G1 code can, however, check the receiver object (the instance + // of java.lang.Reference) and jump to the slow path if null. If the + // Reference object is null then we obviously cannot fetch the referent + // and so we don't need to call the G1 pre-barrier. Thus we can use the + // regular method entry code to generate the NPE. + // + // This code is based on generate_accessor_entry. + // + // rmethod: Method* + // r13: senderSP must preserve for slow path, set SP to it on fast path + + address entry = __ pc(); + + const int referent_offset = java_lang_ref_Reference::referent_offset; + guarantee(referent_offset > 0, "referent offset not initialized"); + + if (UseG1GC) { + Label slow_path; + const Register local_0 = c_rarg0; + // Check if local 0 != NULL + // If the receiver is null then it is OK to jump to the slow path. + __ ldr(local_0, Address(esp, 0)); + __ cbz(local_0, slow_path); + + // Load the value of the referent field. + const Address field_address(local_0, referent_offset); + __ load_heap_oop(local_0, field_address); + + __ mov(r19, r13); // Move senderSP to a callee-saved register + // Generate the G1 pre-barrier code to log the value of + // the referent field in an SATB buffer. + __ enter(); // g1_write may call runtime + __ g1_write_barrier_pre(noreg /* obj */, + local_0 /* pre_val */, + rthread /* thread */, + rscratch2 /* tmp */, + true /* tosca_live */, + true /* expand_call */); + __ leave(); + // areturn + __ andr(sp, r19, -16); // done with stack + __ ret(lr); + + // generate a vanilla interpreter entry as the slow path + __ bind(slow_path); + (void) generate_normal_entry(false); + + return entry; + } +#endif // INCLUDE_ALL_GCS + + // If G1 is not enabled then attempt to go through the accessor entry point + // Reference.get is an accessor + return generate_accessor_entry(); +} + +/** + * Method entry for static native methods: + * int java.util.zip.CRC32.update(int crc, int b) + */ +address InterpreterGenerator::generate_CRC32_update_entry() { + if (UseCRC32Intrinsics) { + address entry = __ pc(); + + // rmethod: Method* + // r13: senderSP must preserved for slow path + // esp: args + + Label slow_path; + // If we need a safepoint check, generate full interpreter entry. + ExternalAddress state(SafepointSynchronize::address_of_state()); + unsigned long offset; + __ adrp(rscratch1, ExternalAddress(SafepointSynchronize::address_of_state()), offset); + __ ldrw(rscratch1, Address(rscratch1, offset)); + assert(SafepointSynchronize::_not_synchronized == 0, "rewrite this code"); + __ cbnz(rscratch1, slow_path); + + // We don't generate local frame and don't align stack because + // we call stub code and there is no safepoint on this path. + + // Load parameters + const Register crc = c_rarg0; // crc + const Register val = c_rarg1; // source java byte value + const Register tbl = c_rarg2; // scratch + + // Arguments are reversed on java expression stack + __ ldrw(val, Address(esp, 0)); // byte value + __ ldrw(crc, Address(esp, wordSize)); // Initial CRC + + __ adrp(tbl, ExternalAddress(StubRoutines::crc_table_addr()), offset); + __ add(tbl, tbl, offset); + + __ ornw(crc, zr, crc); // ~crc + __ update_byte_crc32(crc, val, tbl); + __ ornw(crc, zr, crc); // ~crc + + // result in c_rarg0 + + __ andr(sp, r13, -16); + __ ret(lr); + + // generate a vanilla native entry as the slow path + __ bind(slow_path); + + (void) generate_native_entry(false); + + return entry; + } + return generate_native_entry(false); +} + +/** + * Method entry for static native methods: + * int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len) + * int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len) + */ +address InterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) { + if (UseCRC32Intrinsics) { + address entry = __ pc(); + + // rmethod,: Method* + // r13: senderSP must preserved for slow path + + Label slow_path; + // If we need a safepoint check, generate full interpreter entry. + ExternalAddress state(SafepointSynchronize::address_of_state()); + unsigned long offset; + __ adrp(rscratch1, ExternalAddress(SafepointSynchronize::address_of_state()), offset); + __ ldrw(rscratch1, Address(rscratch1, offset)); + assert(SafepointSynchronize::_not_synchronized == 0, "rewrite this code"); + __ cbnz(rscratch1, slow_path); + + // We don't generate local frame and don't align stack because + // we call stub code and there is no safepoint on this path. + + // Load parameters + const Register crc = c_rarg0; // crc + const Register buf = c_rarg1; // source java byte array address + const Register len = c_rarg2; // length + const Register off = len; // offset (never overlaps with 'len') + + // Arguments are reversed on java expression stack + // Calculate address of start element + if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { + __ ldr(buf, Address(esp, 2*wordSize)); // long buf + __ ldrw(off, Address(esp, wordSize)); // offset + __ add(buf, buf, off); // + offset + __ ldrw(crc, Address(esp, 4*wordSize)); // Initial CRC + } else { + __ ldr(buf, Address(esp, 2*wordSize)); // byte[] array + __ add(buf, buf, arrayOopDesc::base_offset_in_bytes(T_BYTE)); // + header size + __ ldrw(off, Address(esp, wordSize)); // offset + __ add(buf, buf, off); // + offset + __ ldrw(crc, Address(esp, 3*wordSize)); // Initial CRC + } + // Can now load 'len' since we're finished with 'off' + __ ldrw(len, Address(esp, 0x0)); // Length + + __ andr(sp, r13, -16); // Restore the caller's SP + + // We are frameless so we can just jump to the stub. + __ b(CAST_FROM_FN_PTR(address, StubRoutines::updateBytesCRC32())); + + // generate a vanilla native entry as the slow path + __ bind(slow_path); + + (void) generate_native_entry(false); + + return entry; + } + return generate_native_entry(false); +} + +void InterpreterGenerator::bang_stack_shadow_pages(bool native_call) { + // Bang each page in the shadow zone. We can't assume it's been done for + // an interpreter frame with greater than a page of locals, so each page + // needs to be checked. Only true for non-native. + if (UseStackBanging) { + const int start_page = native_call ? StackShadowPages : 1; + const int page_size = os::vm_page_size(); + for (int pages = start_page; pages <= StackShadowPages ; pages++) { + __ sub(rscratch2, sp, pages*page_size); + __ str(zr, Address(rscratch2)); + } + } +} + + +// Interpreter stub for calling a native method. (asm interpreter) +// This sets up a somewhat different looking stack for calling the +// native method than the typical interpreter frame setup. +address InterpreterGenerator::generate_native_entry(bool synchronized) { + // determine code generation flags + bool inc_counter = UseCompiler || CountCompiledCalls; + + // r1: Method* + // rscratch1: sender sp + + address entry_point = __ pc(); + + const Address constMethod (rmethod, Method::const_offset()); + const Address access_flags (rmethod, Method::access_flags_offset()); + const Address size_of_parameters(r2, ConstMethod:: + size_of_parameters_offset()); + + // get parameter size (always needed) + __ ldr(r2, constMethod); + __ load_unsigned_short(r2, size_of_parameters); + + // native calls don't need the stack size check since they have no + // expression stack and the arguments are already on the stack and + // we only add a handful of words to the stack + + // rmethod: Method* + // r2: size of parameters + // rscratch1: sender sp + + // for natives the size of locals is zero + + // compute beginning of parameters (rlocals) + __ add(rlocals, esp, r2, ext::uxtx, 3); + __ add(rlocals, rlocals, -wordSize); + + // Pull SP back to minimum size: this avoids holes in the stack + __ andr(sp, esp, -16); + + // initialize fixed part of activation frame + generate_fixed_frame(true); + + // make sure method is native & not abstract +#ifdef ASSERT + __ ldrw(r0, access_flags); + { + Label L; + __ tst(r0, JVM_ACC_NATIVE); + __ br(Assembler::NE, L); + __ stop("tried to execute non-native method as native"); + __ bind(L); + } + { + Label L; + __ tst(r0, JVM_ACC_ABSTRACT); + __ br(Assembler::EQ, L); + __ stop("tried to execute abstract method in interpreter"); + __ bind(L); + } +#endif + + // Since at this point in the method invocation the exception + // handler would try to exit the monitor of synchronized methods + // which hasn't been entered yet, we set the thread local variable + // _do_not_unlock_if_synchronized to true. The remove_activation + // will check this flag. + + const Address do_not_unlock_if_synchronized(rthread, + in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); + __ mov(rscratch2, true); + __ strb(rscratch2, do_not_unlock_if_synchronized); + + // increment invocation count & check for overflow + Label invocation_counter_overflow; + if (inc_counter) { + generate_counter_incr(&invocation_counter_overflow, NULL, NULL); + } + + Label continue_after_compile; + __ bind(continue_after_compile); + + bang_stack_shadow_pages(true); + + // reset the _do_not_unlock_if_synchronized flag + __ strb(zr, do_not_unlock_if_synchronized); + + // check for synchronized methods + // Must happen AFTER invocation_counter check and stack overflow check, + // so method is not locked if overflows. + if (synchronized) { + lock_method(); + } else { + // no synchronization necessary +#ifdef ASSERT + { + Label L; + __ ldrw(r0, access_flags); + __ tst(r0, JVM_ACC_SYNCHRONIZED); + __ br(Assembler::EQ, L); + __ stop("method needs synchronization"); + __ bind(L); + } +#endif + } + + // start execution +#ifdef ASSERT + { + Label L; + const Address monitor_block_top(rfp, + frame::interpreter_frame_monitor_block_top_offset * wordSize); + __ ldr(rscratch1, monitor_block_top); + __ cmp(esp, rscratch1); + __ br(Assembler::EQ, L); + __ stop("broken stack frame setup in interpreter"); + __ bind(L); + } +#endif + + // jvmti support + __ notify_method_entry(); + + // work registers + const Register t = r17; + const Register result_handler = r19; + + // allocate space for parameters + __ ldr(t, Address(rmethod, Method::const_offset())); + __ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset())); + + __ sub(rscratch1, esp, t, ext::uxtx, Interpreter::logStackElementSize); + __ andr(sp, rscratch1, -16); + __ mov(esp, rscratch1); + + // get signature handler + { + Label L; + __ ldr(t, Address(rmethod, Method::signature_handler_offset())); + __ cbnz(t, L); + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::prepare_native_call), + rmethod); + __ ldr(t, Address(rmethod, Method::signature_handler_offset())); + __ bind(L); + } + + // call signature handler + assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rlocals, + "adjust this code"); + assert(InterpreterRuntime::SignatureHandlerGenerator::to() == sp, + "adjust this code"); + assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == rscratch1, + "adjust this code"); + + // The generated handlers do not touch rmethod (the method). + // However, large signatures cannot be cached and are generated + // each time here. The slow-path generator can do a GC on return, + // so we must reload it after the call. + __ blr(t); + __ get_method(rmethod); // slow path can do a GC, reload rmethod + + + // result handler is in r0 + // set result handler + __ mov(result_handler, r0); + // pass mirror handle if static call + { + Label L; + const int mirror_offset = in_bytes(Klass::java_mirror_offset()); + __ ldrw(t, Address(rmethod, Method::access_flags_offset())); + __ tst(t, JVM_ACC_STATIC); + __ br(Assembler::EQ, L); + // get mirror + __ ldr(t, Address(rmethod, Method::const_offset())); + __ ldr(t, Address(t, ConstMethod::constants_offset())); + __ ldr(t, Address(t, ConstantPool::pool_holder_offset_in_bytes())); + __ ldr(t, Address(t, mirror_offset)); + // copy mirror into activation frame + __ str(t, Address(rfp, frame::interpreter_frame_oop_temp_offset * wordSize)); + // pass handle to mirror + __ add(c_rarg1, rfp, frame::interpreter_frame_oop_temp_offset * wordSize); + __ bind(L); + } + + // get native function entry point in r10 + { + Label L; + __ ldr(r10, Address(rmethod, Method::native_function_offset())); + address unsatisfied = (SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); + __ mov(rscratch2, unsatisfied); + __ ldr(rscratch2, rscratch2); + __ cmp(r10, rscratch2); + __ br(Assembler::NE, L); + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::prepare_native_call), + rmethod); + __ get_method(rmethod); + __ ldr(r10, Address(rmethod, Method::native_function_offset())); + __ bind(L); + } + + // pass JNIEnv + __ add(c_rarg0, rthread, in_bytes(JavaThread::jni_environment_offset())); + + // Set the last Java PC in the frame anchor to be the return address from + // the call to the native method: this will allow the debugger to + // generate an accurate stack trace. + Label native_return; + __ set_last_Java_frame(esp, rfp, native_return, rscratch1); + + // change thread state +#ifdef ASSERT + { + Label L; + __ ldrw(t, Address(rthread, JavaThread::thread_state_offset())); + __ cmp(t, _thread_in_Java); + __ br(Assembler::EQ, L); + __ stop("Wrong thread state in native stub"); + __ bind(L); + } +#endif + + // Change state to native + __ mov(rscratch1, _thread_in_native); + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + + // Call the native method. + __ blr(r10); + __ bind(native_return); + __ maybe_isb(); + __ get_method(rmethod); + // result potentially in r0 or v0 + + // make room for the pushes we're about to do + __ sub(rscratch1, esp, 4 * wordSize); + __ andr(sp, rscratch1, -16); + + // NOTE: The order of these pushes is known to frame::interpreter_frame_result + // in order to extract the result of a method call. If the order of these + // pushes change or anything else is added to the stack then the code in + // interpreter_frame_result must also change. + __ push(dtos); + __ push(ltos); + + // change thread state + __ mov(rscratch1, _thread_in_native_trans); + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + + if (os::is_MP()) { + if (UseMembar) { + // Force this write out before the read below + __ dsb(Assembler::SY); + } else { + // Write serialization page so VM thread can do a pseudo remote membar. + // We use the current thread pointer to calculate a thread specific + // offset to write to within the page. This minimizes bus traffic + // due to cache line collision. + __ serialize_memory(rthread, rscratch2); + } + } + + // check for safepoint operation in progress and/or pending suspend requests + { + Label Continue; + { + unsigned long offset; + __ adrp(rscratch2, SafepointSynchronize::address_of_state(), offset); + __ ldrw(rscratch2, Address(rscratch2, offset)); + } + assert(SafepointSynchronize::_not_synchronized == 0, + "SafepointSynchronize::_not_synchronized"); + Label L; + __ cbnz(rscratch2, L); + __ ldrw(rscratch2, Address(rthread, JavaThread::suspend_flags_offset())); + __ cbz(rscratch2, Continue); + __ bind(L); + + // Don't use call_VM as it will see a possible pending exception + // and forward it and never return here preventing us from + // clearing _last_native_pc down below. Also can't use + // call_VM_leaf either as it will check to see if r13 & r14 are + // preserved and correspond to the bcp/locals pointers. So we do a + // runtime call by hand. + // + __ mov(c_rarg0, rthread); + __ mov(rscratch2, CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)); + __ blr(rscratch2); + __ maybe_isb(); + __ get_method(rmethod); + __ reinit_heapbase(); + __ bind(Continue); + } + + // change thread state + __ mov(rscratch1, _thread_in_Java); + __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset())); + __ stlrw(rscratch1, rscratch2); + + // reset_last_Java_frame + __ reset_last_Java_frame(true); + + // reset handle block + __ ldr(t, Address(rthread, JavaThread::active_handles_offset())); + __ str(zr, Address(t, JNIHandleBlock::top_offset_in_bytes())); + + // If result is an oop unbox and store it in frame where gc will see it + // and result handler will pick it up + + { + Label no_oop, not_weak, store_result; + __ adr(t, ExternalAddress(AbstractInterpreter::result_handler(T_OBJECT))); + __ cmp(t, result_handler); + __ br(Assembler::NE, no_oop); + // Unbox oop result, e.g. JNIHandles::resolve result. + __ pop(ltos); + __ cbz(r0, store_result); // Use NULL as-is. + STATIC_ASSERT(JNIHandles::weak_tag_mask == 1u); + __ tbz(r0, 0, not_weak); // Test for jweak tag. + // Resolve jweak. + __ ldr(r0, Address(r0, -JNIHandles::weak_tag_value)); +#if INCLUDE_ALL_GCS + if (UseG1GC) { + __ enter(); // Barrier may call runtime. + __ g1_write_barrier_pre(noreg /* obj */, + r0 /* pre_val */, + rthread /* thread */, + t /* tmp */, + true /* tosca_live */, + true /* expand_call */); + __ leave(); + } +#endif // INCLUDE_ALL_GCS + __ b(store_result); + __ bind(not_weak); + // Resolve (untagged) jobject. + __ ldr(r0, Address(r0, 0)); + __ bind(store_result); + __ str(r0, Address(rfp, frame::interpreter_frame_oop_temp_offset*wordSize)); + // keep stack depth as expected by pushing oop which will eventually be discarded + __ push(ltos); + __ bind(no_oop); + } + + { + Label no_reguard; + __ lea(rscratch1, Address(rthread, in_bytes(JavaThread::stack_guard_state_offset()))); + __ ldrb(rscratch1, Address(rscratch1)); + __ cmp(rscratch1, JavaThread::stack_guard_yellow_disabled); + __ br(Assembler::NE, no_reguard); + + __ pusha(); // XXX only save smashed registers + __ mov(c_rarg0, rthread); + __ mov(rscratch2, CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)); + __ blr(rscratch2); + __ popa(); // XXX only restore smashed registers + __ bind(no_reguard); + } + + // The method register is junk from after the thread_in_native transition + // until here. Also can't call_VM until the bcp has been + // restored. Need bcp for throwing exception below so get it now. + __ get_method(rmethod); + + // restore bcp to have legal interpreter frame, i.e., bci == 0 <=> + // rbcp == code_base() + __ ldr(rbcp, Address(rmethod, Method::const_offset())); // get ConstMethod* + __ add(rbcp, rbcp, in_bytes(ConstMethod::codes_offset())); // get codebase + // handle exceptions (exception handling will handle unlocking!) + { + Label L; + __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset())); + __ cbz(rscratch1, L); + // Note: At some point we may want to unify this with the code + // used in call_VM_base(); i.e., we should use the + // StubRoutines::forward_exception code. For now this doesn't work + // here because the rsp is not correctly set at this point. + __ MacroAssembler::call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::throw_pending_exception)); + __ should_not_reach_here(); + __ bind(L); + } + + // do unlocking if necessary + { + Label L; + __ ldrw(t, Address(rmethod, Method::access_flags_offset())); + __ tst(t, JVM_ACC_SYNCHRONIZED); + __ br(Assembler::EQ, L); + // the code below should be shared with interpreter macro + // assembler implementation + { + Label unlock; + // 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. + + // monitor expect in c_rarg1 for slow unlock path + __ lea (c_rarg1, Address(rfp, // address of first monitor + (intptr_t)(frame::interpreter_frame_initial_sp_offset * + wordSize - sizeof(BasicObjectLock)))); + + __ ldr(t, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes())); + __ cbnz(t, unlock); + + // Entry already unlocked, need to throw exception + __ MacroAssembler::call_VM(noreg, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::throw_illegal_monitor_state_exception)); + __ should_not_reach_here(); + + __ bind(unlock); + __ unlock_object(c_rarg1); + } + __ bind(L); + } + + // jvmti support + // Note: This must happen _after_ handling/throwing any exceptions since + // the exception handler code notifies the runtime of method exits + // too. If this happens before, method entry/exit notifications are + // not properly paired (was bug - gri 11/22/99). + __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI); + + // restore potential result in r0:d0, call result handler to + // restore potential result in ST0 & handle result + + __ pop(ltos); + __ pop(dtos); + + __ blr(result_handler); + + // remove activation + __ ldr(esp, Address(rfp, + frame::interpreter_frame_sender_sp_offset * + wordSize)); // get sender sp + // remove frame anchor + __ leave(); + + // resture sender sp + __ mov(sp, esp); + + __ ret(lr); + + if (inc_counter) { + // Handle overflow of counter and compile method + __ bind(invocation_counter_overflow); + generate_counter_overflow(&continue_after_compile); + } + + return entry_point; +} + +// +// Generic interpreted method entry to (asm) interpreter +// +address InterpreterGenerator::generate_normal_entry(bool synchronized) { + // determine code generation flags + bool inc_counter = UseCompiler || CountCompiledCalls; + + // rscratch1: sender sp + address entry_point = __ pc(); + + const Address constMethod(rmethod, Method::const_offset()); + const Address access_flags(rmethod, Method::access_flags_offset()); + const Address size_of_parameters(r3, + ConstMethod::size_of_parameters_offset()); + const Address size_of_locals(r3, ConstMethod::size_of_locals_offset()); + + // get parameter size (always needed) + // need to load the const method first + __ ldr(r3, constMethod); + __ load_unsigned_short(r2, size_of_parameters); + + // r2: size of parameters + + __ load_unsigned_short(r3, size_of_locals); // get size of locals in words + __ sub(r3, r3, r2); // r3 = no. of additional locals + + // see if we've got enough room on the stack for locals plus overhead. + generate_stack_overflow_check(); + + // compute beginning of parameters (rlocals) + __ add(rlocals, esp, r2, ext::uxtx, 3); + __ sub(rlocals, rlocals, wordSize); + + // Make room for locals + __ sub(rscratch1, esp, r3, ext::uxtx, 3); + __ andr(sp, rscratch1, -16); + + // r3 - # of additional locals + // allocate space for locals + // explicitly initialize locals + { + Label exit, loop; + __ ands(zr, r3, r3); + __ br(Assembler::LE, exit); // do nothing if r3 <= 0 + __ bind(loop); + __ str(zr, Address(__ post(rscratch1, wordSize))); + __ sub(r3, r3, 1); // until everything initialized + __ cbnz(r3, loop); + __ bind(exit); + } + + // And the base dispatch table + __ get_dispatch(); + + // initialize fixed part of activation frame + generate_fixed_frame(false); + + // make sure method is not native & not abstract +#ifdef ASSERT + __ ldrw(r0, access_flags); + { + Label L; + __ tst(r0, JVM_ACC_NATIVE); + __ br(Assembler::EQ, L); + __ stop("tried to execute native method as non-native"); + __ bind(L); + } + { + Label L; + __ tst(r0, JVM_ACC_ABSTRACT); + __ br(Assembler::EQ, L); + __ stop("tried to execute abstract method in interpreter"); + __ bind(L); + } +#endif + + // Since at this point in the method invocation the exception + // handler would try to exit the monitor of synchronized methods + // which hasn't been entered yet, we set the thread local variable + // _do_not_unlock_if_synchronized to true. The remove_activation + // will check this flag. + + const Address do_not_unlock_if_synchronized(rthread, + in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); + __ mov(rscratch2, true); + __ strb(rscratch2, do_not_unlock_if_synchronized); + + // increment invocation count & check for overflow + Label invocation_counter_overflow; + Label profile_method; + Label profile_method_continue; + if (inc_counter) { + generate_counter_incr(&invocation_counter_overflow, + &profile_method, + &profile_method_continue); + if (ProfileInterpreter) { + __ bind(profile_method_continue); + } + } + + Label continue_after_compile; + __ bind(continue_after_compile); + + bang_stack_shadow_pages(false); + + // reset the _do_not_unlock_if_synchronized flag + __ strb(zr, do_not_unlock_if_synchronized); + + // check for synchronized methods + // Must happen AFTER invocation_counter check and stack overflow check, + // so method is not locked if overflows. + if (synchronized) { + // Allocate monitor and lock method + lock_method(); + } else { + // no synchronization necessary +#ifdef ASSERT + { + Label L; + __ ldrw(r0, access_flags); + __ tst(r0, JVM_ACC_SYNCHRONIZED); + __ br(Assembler::EQ, L); + __ stop("method needs synchronization"); + __ bind(L); + } +#endif + } + + // start execution +#ifdef ASSERT + { + Label L; + const Address monitor_block_top (rfp, + frame::interpreter_frame_monitor_block_top_offset * wordSize); + __ ldr(rscratch1, monitor_block_top); + __ cmp(esp, rscratch1); + __ br(Assembler::EQ, L); + __ stop("broken stack frame setup in interpreter"); + __ bind(L); + } +#endif + + // jvmti support + __ notify_method_entry(); + + __ dispatch_next(vtos); + + // invocation counter overflow + if (inc_counter) { + if (ProfileInterpreter) { + // We have decided to profile this method in the interpreter + __ bind(profile_method); + __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method)); + __ set_method_data_pointer_for_bcp(); + // don't think we need this + __ get_method(r1); + __ b(profile_method_continue); + } + // Handle overflow of counter and compile method + __ bind(invocation_counter_overflow); + generate_counter_overflow(&continue_after_compile); + } + + return entry_point; +} + +// Entry points +// +// Here we generate the various kind of entries into the interpreter. +// The two main entry type are generic bytecode methods and native +// call method. These both come in synchronized and non-synchronized +// versions but the frame layout they create is very similar. The +// other method entry types are really just special purpose entries +// that are really entry and interpretation all in one. These are for +// trivial methods like accessor, empty, or special math methods. +// +// When control flow reaches any of the entry types for the interpreter +// the following holds -> +// +// Arguments: +// +// rmethod: Method* +// +// Stack layout immediately at entry +// +// [ return address ] <--- rsp +// [ parameter n ] +// ... +// [ parameter 1 ] +// [ expression stack ] (caller's java expression stack) + +// Assuming that we don't go to one of the trivial specialized entries +// the stack will look like below when we are ready to execute the +// first bytecode (or call the native routine). The register usage +// will be as the template based interpreter expects (see +// interpreter_aarch64.hpp). +// +// local variables follow incoming parameters immediately; i.e. +// the return address is moved to the end of the locals). +// +// [ monitor entry ] <--- esp +// ... +// [ monitor entry ] +// [ expr. stack bottom ] +// [ saved rbcp ] +// [ current rlocals ] +// [ Method* ] +// [ saved rfp ] <--- rfp +// [ return address ] +// [ local variable m ] +// ... +// [ local variable 1 ] +// [ parameter n ] +// ... +// [ parameter 1 ] <--- rlocals + +address AbstractInterpreterGenerator::generate_method_entry( + AbstractInterpreter::MethodKind kind) { + // determine code generation flags + bool synchronized = false; + address entry_point = NULL; + + switch (kind) { + case Interpreter::zerolocals : break; + case Interpreter::zerolocals_synchronized: synchronized = true; break; + case Interpreter::native : entry_point = ((InterpreterGenerator*) this)->generate_native_entry(false); break; + case Interpreter::native_synchronized : entry_point = ((InterpreterGenerator*) this)->generate_native_entry(true); break; + case Interpreter::empty : entry_point = ((InterpreterGenerator*) this)->generate_empty_entry(); break; + case Interpreter::accessor : entry_point = ((InterpreterGenerator*) this)->generate_accessor_entry(); break; + case Interpreter::abstract : entry_point = ((InterpreterGenerator*) this)->generate_abstract_entry(); break; + + case Interpreter::java_lang_math_sin : // fall thru + case Interpreter::java_lang_math_cos : // fall thru + case Interpreter::java_lang_math_tan : // fall thru + case Interpreter::java_lang_math_abs : // fall thru + case Interpreter::java_lang_math_log : // fall thru + case Interpreter::java_lang_math_log10 : // fall thru + case Interpreter::java_lang_math_sqrt : // fall thru + case Interpreter::java_lang_math_pow : // fall thru + case Interpreter::java_lang_math_exp : entry_point = ((InterpreterGenerator*) this)->generate_math_entry(kind); break; + case Interpreter::java_lang_ref_reference_get + : entry_point = ((InterpreterGenerator*)this)->generate_Reference_get_entry(); break; + case Interpreter::java_util_zip_CRC32_update + : entry_point = ((InterpreterGenerator*)this)->generate_CRC32_update_entry(); break; + case Interpreter::java_util_zip_CRC32_updateBytes + : // fall thru + case Interpreter::java_util_zip_CRC32_updateByteBuffer + : entry_point = ((InterpreterGenerator*)this)->generate_CRC32_updateBytes_entry(kind); break; + default : ShouldNotReachHere(); break; + } + + if (entry_point) { + return entry_point; + } + + return ((InterpreterGenerator*) this)-> + generate_normal_entry(synchronized); +} + + +// These should never be compiled since the interpreter will prefer +// the compiled version to the intrinsic version. +bool AbstractInterpreter::can_be_compiled(methodHandle m) { + switch (method_kind(m)) { + case Interpreter::java_lang_math_sin : // fall thru + case Interpreter::java_lang_math_cos : // fall thru + case Interpreter::java_lang_math_tan : // fall thru + case Interpreter::java_lang_math_abs : // fall thru + case Interpreter::java_lang_math_log : // fall thru + case Interpreter::java_lang_math_log10 : // fall thru + case Interpreter::java_lang_math_sqrt : // fall thru + case Interpreter::java_lang_math_pow : // fall thru + case Interpreter::java_lang_math_exp : + return false; + default: + return true; + } +} + +// How much stack a method activation needs in words. +int AbstractInterpreter::size_top_interpreter_activation(Method* method) { + const int entry_size = frame::interpreter_frame_monitor_size(); + + // total overhead size: entry_size + (saved rfp thru expr stack + // bottom). be sure to change this if you add/subtract anything + // to/from the overhead area + const int overhead_size = + -(frame::interpreter_frame_initial_sp_offset) + entry_size; + + const int stub_code = frame::entry_frame_after_call_words; + const int method_stack = (method->max_locals() + method->max_stack()) * + Interpreter::stackElementWords; + return (overhead_size + method_stack + stub_code); +} + +// asm based interpreter deoptimization helpers +int AbstractInterpreter::size_activation(int max_stack, + int temps, + int extra_args, + int monitors, + int callee_params, + int callee_locals, + bool is_top_frame) { + // Note: This calculation must exactly parallel the frame setup + // in AbstractInterpreterGenerator::generate_method_entry. + + // fixed size of an interpreter frame: + int overhead = frame::sender_sp_offset - + frame::interpreter_frame_initial_sp_offset; + // Our locals were accounted for by the caller (or last_frame_adjust + // on the transistion) Since the callee parameters already account + // for the callee's params we only need to account for the extra + // locals. + int size = overhead + + (callee_locals - callee_params) + + monitors * frame::interpreter_frame_monitor_size() + + // On the top frame, at all times SP <= ESP, and SP is + // 16-aligned. We ensure this by adjusting SP on method + // entry and re-entry to allow room for the maximum size of + // the expression stack. When we call another method we bump + // SP so that no stack space is wasted. So, only on the top + // frame do we need to allow max_stack words. + (is_top_frame ? max_stack : temps + extra_args); + + // On AArch64 we always keep the stack pointer 16-aligned, so we + // must round up here. + size = round_to(size, 2); + + return size; +} + +void AbstractInterpreter::layout_activation(Method* method, + int tempcount, + int popframe_extra_args, + int moncount, + int caller_actual_parameters, + int callee_param_count, + int callee_locals, + frame* caller, + frame* interpreter_frame, + bool is_top_frame, + bool is_bottom_frame) { + // The frame interpreter_frame is guaranteed to be the right size, + // as determined by a previous call to the size_activation() method. + // It is also guaranteed to be walkable even though it is in a + // skeletal state + + int max_locals = method->max_locals() * Interpreter::stackElementWords; + int extra_locals = (method->max_locals() - method->size_of_parameters()) * + Interpreter::stackElementWords; + +#ifdef ASSERT + assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable"); +#endif + + interpreter_frame->interpreter_frame_set_method(method); + // NOTE the difference in using sender_sp and + // interpreter_frame_sender_sp interpreter_frame_sender_sp is + // the original sp of the caller (the unextended_sp) and + // sender_sp is fp+8/16 (32bit/64bit) XXX + intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1; + +#ifdef ASSERT + if (caller->is_interpreted_frame()) { + assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement"); + } +#endif + + interpreter_frame->interpreter_frame_set_locals(locals); + BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin(); + BasicObjectLock* monbot = montop - moncount; + interpreter_frame->interpreter_frame_set_monitor_end(monbot); + + // Set last_sp + intptr_t* esp = (intptr_t*) monbot - + tempcount*Interpreter::stackElementWords - + popframe_extra_args; + interpreter_frame->interpreter_frame_set_last_sp(esp); + + // All frames but the initial (oldest) interpreter frame we fill in have + // a value for sender_sp that allows walking the stack but isn't + // truly correct. Correct the value here. + if (extra_locals != 0 && + interpreter_frame->sender_sp() == + interpreter_frame->interpreter_frame_sender_sp()) { + interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() + + extra_locals); + } + *interpreter_frame->interpreter_frame_cache_addr() = + method->constants()->cache(); +} + + +//----------------------------------------------------------------------------- +// Exceptions + +void TemplateInterpreterGenerator::generate_throw_exception() { + // Entry point in previous activation (i.e., if the caller was + // interpreted) + Interpreter::_rethrow_exception_entry = __ pc(); + // Restore sp to interpreter_frame_last_sp even though we are going + // to empty the expression stack for the exception processing. + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + // r0: exception + // r3: return address/pc that threw exception + __ restore_bcp(); // rbcp points to call/send + __ restore_locals(); + __ restore_constant_pool_cache(); + __ reinit_heapbase(); // restore rheapbase as heapbase. + __ get_dispatch(); + + // Entry point for exceptions thrown within interpreter code + Interpreter::_throw_exception_entry = __ pc(); + // If we came here via a NullPointerException on the receiver of a + // method, rmethod may be corrupt. + __ get_method(rmethod); + // expression stack is undefined here + // r0: exception + // rbcp: exception bcp + __ verify_oop(r0); + __ mov(c_rarg1, r0); + + // expression stack must be empty before entering the VM in case of + // an exception + __ empty_expression_stack(); + // find exception handler address and preserve exception oop + __ call_VM(r3, + CAST_FROM_FN_PTR(address, + InterpreterRuntime::exception_handler_for_exception), + c_rarg1); + + // Calculate stack limit + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); + __ ldrh(rscratch1, Address(rscratch1, ConstMethod::max_stack_offset())); + __ add(rscratch1, rscratch1, frame::interpreter_frame_monitor_size() + + (EnableInvokeDynamic ? 2 : 0) + 2); + __ ldr(rscratch2, + Address(rfp, frame::interpreter_frame_initial_sp_offset * wordSize)); + __ sub(rscratch1, rscratch2, rscratch1, ext::uxtx, 3); + __ andr(sp, rscratch1, -16); + + // r0: exception handler entry point + // r3: preserved exception oop + // rbcp: bcp for exception handler + __ push_ptr(r3); // push exception which is now the only value on the stack + __ br(r0); // jump to exception handler (may be _remove_activation_entry!) + + // If the exception is not handled in the current frame the frame is + // removed and the exception is rethrown (i.e. exception + // continuation is _rethrow_exception). + // + // Note: At this point the bci is still the bxi for the instruction + // which caused the exception and the expression stack is + // empty. Thus, for any VM calls at this point, GC will find a legal + // oop map (with empty expression stack). + + // + // JVMTI PopFrame support + // + + Interpreter::_remove_activation_preserving_args_entry = __ pc(); + __ empty_expression_stack(); + // Set the popframe_processing bit in pending_popframe_condition + // indicating that we are currently handling popframe, so that + // call_VMs that may happen later do not trigger new popframe + // handling cycles. + __ ldrw(r3, Address(rthread, JavaThread::popframe_condition_offset())); + __ orr(r3, r3, JavaThread::popframe_processing_bit); + __ strw(r3, Address(rthread, JavaThread::popframe_condition_offset())); + + { + // Check to see whether we are returning to a deoptimized frame. + // (The PopFrame call ensures that the caller of the popped frame is + // either interpreted or compiled and deoptimizes it if compiled.) + // In this case, we can't call dispatch_next() after the frame is + // popped, but instead must save the incoming arguments and restore + // them after deoptimization has occurred. + // + // Note that we don't compare the return PC against the + // deoptimization blob's unpack entry because of the presence of + // adapter frames in C2. + Label caller_not_deoptimized; + __ ldr(c_rarg1, Address(rfp, frame::return_addr_offset * wordSize)); + __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, + InterpreterRuntime::interpreter_contains), c_rarg1); + __ cbnz(r0, caller_not_deoptimized); + + // Compute size of arguments for saving when returning to + // deoptimized caller + __ get_method(r0); + __ ldr(r0, Address(r0, Method::const_offset())); + __ load_unsigned_short(r0, Address(r0, in_bytes(ConstMethod:: + size_of_parameters_offset()))); + __ lsl(r0, r0, Interpreter::logStackElementSize); + __ restore_locals(); // XXX do we need this? + __ sub(rlocals, rlocals, r0); + __ add(rlocals, rlocals, wordSize); + // Save these arguments + __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, + Deoptimization:: + popframe_preserve_args), + rthread, r0, rlocals); + + __ remove_activation(vtos, + /* throw_monitor_exception */ false, + /* install_monitor_exception */ false, + /* notify_jvmdi */ false); + + // Inform deoptimization that it is responsible for restoring + // these arguments + __ mov(rscratch1, JavaThread::popframe_force_deopt_reexecution_bit); + __ strw(rscratch1, Address(rthread, JavaThread::popframe_condition_offset())); + + // Continue in deoptimization handler + __ ret(lr); + + __ bind(caller_not_deoptimized); + } + + __ remove_activation(vtos, + /* throw_monitor_exception */ false, + /* install_monitor_exception */ false, + /* notify_jvmdi */ false); + + // Restore the last_sp and null it out + __ ldr(esp, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize)); + + __ restore_bcp(); + __ restore_locals(); + __ restore_constant_pool_cache(); + __ get_method(rmethod); + __ get_dispatch(); + + // The method data pointer was incremented already during + // call profiling. We have to restore the mdp for the current bcp. + if (ProfileInterpreter) { + __ set_method_data_pointer_for_bcp(); + } + + // Clear the popframe condition flag + __ strw(zr, Address(rthread, JavaThread::popframe_condition_offset())); + assert(JavaThread::popframe_inactive == 0, "fix popframe_inactive"); + +#if INCLUDE_JVMTI + if (EnableInvokeDynamic) { + Label L_done; + + __ ldrb(rscratch1, Address(rbcp, 0)); + __ cmpw(rscratch1, Bytecodes::_invokestatic); + __ br(Assembler::NE, L_done); + + // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call. + // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL. + + __ ldr(c_rarg0, Address(rlocals, 0)); + __ call_VM(r0, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), c_rarg0, rmethod, rbcp); + + __ cbz(r0, L_done); + + __ str(r0, Address(esp, 0)); + __ bind(L_done); + } +#endif // INCLUDE_JVMTI + + // Restore machine SP + __ ldr(rscratch1, Address(rmethod, Method::const_offset())); + __ ldrh(rscratch1, Address(rscratch1, ConstMethod::max_stack_offset())); + __ add(rscratch1, rscratch1, frame::interpreter_frame_monitor_size() + + (EnableInvokeDynamic ? 2 : 0)); + __ ldr(rscratch2, + Address(rfp, frame::interpreter_frame_initial_sp_offset * wordSize)); + __ sub(rscratch1, rscratch2, rscratch1, ext::uxtw, 3); + __ andr(sp, rscratch1, -16); + + __ dispatch_next(vtos); + // end of PopFrame support + + Interpreter::_remove_activation_entry = __ pc(); + + // preserve exception over this code sequence + __ pop_ptr(r0); + __ str(r0, Address(rthread, JavaThread::vm_result_offset())); + // remove the activation (without doing throws on illegalMonitorExceptions) + __ remove_activation(vtos, false, true, false); + // restore exception + __ get_vm_result(r0, rthread); + + // In between activations - previous activation type unknown yet + // compute continuation point - the continuation point expects the + // following registers set up: + // + // r0: exception + // lr: return address/pc that threw exception + // esp: expression stack of caller + // rfp: fp of caller + __ stp(r0, lr, Address(__ pre(sp, -2 * wordSize))); // save exception & return address + __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, + SharedRuntime::exception_handler_for_return_address), + rthread, lr); + __ mov(r1, r0); // save exception handler + __ ldp(r0, lr, Address(__ post(sp, 2 * wordSize))); // restore exception & return address + // We might be returning to a deopt handler that expects r3 to + // contain the exception pc + __ mov(r3, lr); + // Note that an "issuing PC" is actually the next PC after the call + __ br(r1); // jump to exception + // handler of caller +} + + +// +// JVMTI ForceEarlyReturn support +// +address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) { + address entry = __ pc(); + + __ restore_bcp(); + __ restore_locals(); + __ empty_expression_stack(); + __ load_earlyret_value(state); + + __ ldr(rscratch1, Address(rthread, JavaThread::jvmti_thread_state_offset())); + Address cond_addr(rscratch1, JvmtiThreadState::earlyret_state_offset()); + + // Clear the earlyret state + assert(JvmtiThreadState::earlyret_inactive == 0, "should be"); + __ str(zr, cond_addr); + + __ remove_activation(state, + false, /* throw_monitor_exception */ + false, /* install_monitor_exception */ + true); /* notify_jvmdi */ + __ ret(lr); + + return entry; +} // end of ForceEarlyReturn support + + + +//----------------------------------------------------------------------------- +// Helper for vtos entry point generation + +void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t, + address& bep, + address& cep, + address& sep, + address& aep, + address& iep, + address& lep, + address& fep, + address& dep, + address& vep) { + assert(t->is_valid() && t->tos_in() == vtos, "illegal template"); + Label L; + aep = __ pc(); __ push_ptr(); __ b(L); + fep = __ pc(); __ push_f(); __ b(L); + dep = __ pc(); __ push_d(); __ b(L); + lep = __ pc(); __ push_l(); __ b(L); + bep = cep = sep = + iep = __ pc(); __ push_i(); + vep = __ pc(); + __ bind(L); + generate_and_dispatch(t); +} + +//----------------------------------------------------------------------------- +// Generation of individual instructions + +// helpers for generate_and_dispatch + + +InterpreterGenerator::InterpreterGenerator(StubQueue* code) + : TemplateInterpreterGenerator(code) { + generate_all(); // down here so it can be "virtual" +} + +//----------------------------------------------------------------------------- + +// Non-product code +#ifndef PRODUCT +address TemplateInterpreterGenerator::generate_trace_code(TosState state) { + address entry = __ pc(); + + __ push(lr); + __ push(state); + __ push(RegSet::range(r0, r15), sp); + __ mov(c_rarg2, r0); // Pass itos + __ call_VM(noreg, + CAST_FROM_FN_PTR(address, SharedRuntime::trace_bytecode), + c_rarg1, c_rarg2, c_rarg3); + __ pop(RegSet::range(r0, r15), sp); + __ pop(state); + __ pop(lr); + __ ret(lr); // return from result handler + + return entry; +} + +void TemplateInterpreterGenerator::count_bytecode() { + Register rscratch3 = r0; + __ push(rscratch1); + __ push(rscratch2); + __ push(rscratch3); + __ mov(rscratch3, (address) &BytecodeCounter::_counter_value); + __ atomic_add(noreg, 1, rscratch3); + __ pop(rscratch3); + __ pop(rscratch2); + __ pop(rscratch1); +} + +void TemplateInterpreterGenerator::histogram_bytecode(Template* t) { ; } + +void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) { ; } + + +void TemplateInterpreterGenerator::trace_bytecode(Template* t) { + // Call a little run-time stub to avoid blow-up for each bytecode. + // The run-time runtime saves the right registers, depending on + // the tosca in-state for the given template. + + assert(Interpreter::trace_code(t->tos_in()) != NULL, + "entry must have been generated"); + __ bl(Interpreter::trace_code(t->tos_in())); + __ reinit_heapbase(); +} + + +void TemplateInterpreterGenerator::stop_interpreter_at() { + Label L; + __ push(rscratch1); + __ mov(rscratch1, (address) &BytecodeCounter::_counter_value); + __ ldr(rscratch1, Address(rscratch1)); + __ mov(rscratch2, StopInterpreterAt); + __ cmpw(rscratch1, rscratch2); + __ br(Assembler::NE, L); + __ brk(0); + __ bind(L); + __ pop(rscratch1); +} + +#endif // !PRODUCT +#endif // ! CC_INTERP