/* * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 "interp_masm_x86_32.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/interpreterRuntime.hpp" #include "oops/arrayOop.hpp" #include "oops/markOop.hpp" #include "oops/methodDataOop.hpp" #include "oops/methodOop.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiRedefineClassesTrace.hpp" #include "prims/jvmtiThreadState.hpp" #include "runtime/basicLock.hpp" #include "runtime/biasedLocking.hpp" #include "runtime/sharedRuntime.hpp" #ifdef TARGET_OS_FAMILY_linux # include "thread_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "thread_solaris.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_windows # include "thread_windows.inline.hpp" #endif // Implementation of InterpreterMacroAssembler #ifdef CC_INTERP void InterpreterMacroAssembler::get_method(Register reg) { movptr(reg, Address(rbp, -(sizeof(BytecodeInterpreter) + 2 * wordSize))); movptr(reg, Address(reg, byte_offset_of(BytecodeInterpreter, _method))); } #endif // CC_INTERP #ifndef CC_INTERP void InterpreterMacroAssembler::call_VM_leaf_base( address entry_point, int number_of_arguments ) { // interpreter specific // // Note: No need to save/restore bcp & locals (rsi & rdi) pointer // since these are callee saved registers and no blocking/ // GC can happen in leaf calls. // Further Note: DO NOT save/restore bcp/locals. If a caller has // already saved them so that it can use rsi/rdi as temporaries // then a save/restore here will DESTROY the copy the caller // saved! There used to be a save_bcp() that only happened in // the ASSERT path (no restore_bcp). Which caused bizarre failures // when jvm built with ASSERTs. #ifdef ASSERT { Label L; cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD); jcc(Assembler::equal, L); stop("InterpreterMacroAssembler::call_VM_leaf_base: last_sp != NULL"); bind(L); } #endif // super call MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments); // interpreter specific // Used to ASSERT that rsi/rdi were equal to frame's bcp/locals // but since they may not have been saved (and we don't want to // save them here (see note above) the assert is invalid. } 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 ) { #ifdef ASSERT { Label L; cmpptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD); jcc(Assembler::equal, L); stop("InterpreterMacroAssembler::call_VM_base: last_sp != NULL"); bind(L); } #endif /* ASSERT */ // 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(); // super call MacroAssembler::call_VM_base(oop_result, java_thread, last_java_sp, entry_point, number_of_arguments, check_exceptions); // interpreter specific restore_bcp(); restore_locals(); } 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. Register pop_cond = java_thread; // Not clear if any other register is available... movl(pop_cond, Address(java_thread, JavaThread::popframe_condition_offset())); testl(pop_cond, JavaThread::popframe_pending_bit); jcc(Assembler::zero, L); testl(pop_cond, JavaThread::popframe_processing_bit); jcc(Assembler::notZero, 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)); jmp(rax); bind(L); get_thread(java_thread); } } void InterpreterMacroAssembler::load_earlyret_value(TosState state) { get_thread(rcx); movl(rcx, Address(rcx, JavaThread::jvmti_thread_state_offset())); const Address tos_addr (rcx, JvmtiThreadState::earlyret_tos_offset()); const Address oop_addr (rcx, JvmtiThreadState::earlyret_oop_offset()); const Address val_addr (rcx, JvmtiThreadState::earlyret_value_offset()); const Address val_addr1(rcx, JvmtiThreadState::earlyret_value_offset() + in_ByteSize(wordSize)); switch (state) { case atos: movptr(rax, oop_addr); movptr(oop_addr, NULL_WORD); verify_oop(rax, state); break; case ltos: movl(rdx, val_addr1); // fall through case btos: // fall through case ctos: // fall through case stos: // fall through case itos: movl(rax, val_addr); break; case ftos: fld_s(val_addr); break; case dtos: fld_d(val_addr); break; case vtos: /* nothing to do */ break; default : ShouldNotReachHere(); } // Clean up tos value in the thread object movl(tos_addr, (int32_t) ilgl); movptr(val_addr, NULL_WORD); NOT_LP64(movptr(val_addr1, NULL_WORD)); } void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) { if (JvmtiExport::can_force_early_return()) { Label L; Register tmp = java_thread; movptr(tmp, Address(tmp, JavaThread::jvmti_thread_state_offset())); testptr(tmp, tmp); jcc(Assembler::zero, 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. movl(tmp, Address(tmp, JvmtiThreadState::earlyret_state_offset())); cmpl(tmp, JvmtiThreadState::earlyret_pending); jcc(Assembler::notEqual, L); // Call Interpreter::remove_activation_early_entry() to get the address of the // same-named entrypoint in the generated interpreter code. get_thread(java_thread); movptr(tmp, Address(java_thread, JavaThread::jvmti_thread_state_offset())); pushl(Address(tmp, JvmtiThreadState::earlyret_tos_offset())); call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), 1); jmp(rax); bind(L); get_thread(java_thread); } } 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"); movl(reg, Address(rsi, bcp_offset)); bswapl(reg); shrl(reg, 16); } void InterpreterMacroAssembler::get_cache_index_at_bcp(Register reg, 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(reg, Address(rsi, bcp_offset)); } else if (index_size == sizeof(u4)) { assert(EnableInvokeDynamic, "giant index used only for EnableInvokeDynamic"); movl(reg, Address(rsi, 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(constantPoolCacheOopDesc::decode_secondary_index(~123) == 123, "else change next line"); notl(reg); // convert to plain index } else if (index_size == sizeof(u1)) { assert(EnableMethodHandles, "tiny index used only for EnableMethodHandles"); load_unsigned_byte(reg, Address(rsi, bcp_offset)); } else { ShouldNotReachHere(); } } void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, Register index, int bcp_offset, size_t index_size) { assert(cache != index, "must use different registers"); get_cache_index_at_bcp(index, bcp_offset, index_size); movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize)); assert(sizeof(ConstantPoolCacheEntry) == 4*wordSize, "adjust code below"); shlptr(index, 2); // convert from field index to ConstantPoolCacheEntry index } 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 shll(tmp, 2 + LogBytesPerWord); movptr(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize)); // skip past the header addptr(cache, in_bytes(constantPoolCacheOopDesc::base_offset())); addptr(cache, tmp); // construct pointer to cache entry } // Generate a subtype check: branch to ok_is_subtype if sub_klass is // a subtype of super_klass. EAX holds the super_klass. Blows ECX. // Resets EDI to locals. Register sub_klass cannot be any of the above. void InterpreterMacroAssembler::gen_subtype_check( Register Rsub_klass, Label &ok_is_subtype ) { assert( Rsub_klass != rax, "rax, holds superklass" ); assert( Rsub_klass != rcx, "used as a temp" ); assert( Rsub_klass != rdi, "used as a temp, restored from locals" ); // Profile the not-null value's klass. profile_typecheck(rcx, Rsub_klass, rdi); // blows rcx, reloads rdi // Do the check. check_klass_subtype(Rsub_klass, rax, rcx, ok_is_subtype); // blows rcx // Profile the failure of the check. profile_typecheck_failed(rcx); // blows rcx } void InterpreterMacroAssembler::f2ieee() { if (IEEEPrecision) { fstp_s(Address(rsp, 0)); fld_s(Address(rsp, 0)); } } void InterpreterMacroAssembler::d2ieee() { if (IEEEPrecision) { fstp_d(Address(rsp, 0)); fld_d(Address(rsp, 0)); } } // Java Expression Stack void InterpreterMacroAssembler::pop_ptr(Register r) { pop(r); } void InterpreterMacroAssembler::pop_i(Register r) { pop(r); } void InterpreterMacroAssembler::pop_l(Register lo, Register hi) { pop(lo); pop(hi); } void InterpreterMacroAssembler::pop_f() { fld_s(Address(rsp, 0)); addptr(rsp, 1 * wordSize); } void InterpreterMacroAssembler::pop_d() { fld_d(Address(rsp, 0)); addptr(rsp, 2 * wordSize); } void InterpreterMacroAssembler::pop(TosState state) { switch (state) { case atos: pop_ptr(rax); break; case btos: // fall through case ctos: // fall through case stos: // fall through case itos: pop_i(rax); break; case ltos: pop_l(rax, rdx); break; case ftos: pop_f(); break; case dtos: pop_d(); break; case vtos: /* nothing to do */ break; default : ShouldNotReachHere(); } verify_oop(rax, state); } void InterpreterMacroAssembler::push_ptr(Register r) { push(r); } void InterpreterMacroAssembler::push_i(Register r) { push(r); } void InterpreterMacroAssembler::push_l(Register lo, Register hi) { push(hi); push(lo); } void InterpreterMacroAssembler::push_f() { // Do not schedule for no AGI! Never write beyond rsp! subptr(rsp, 1 * wordSize); fstp_s(Address(rsp, 0)); } void InterpreterMacroAssembler::push_d(Register r) { // Do not schedule for no AGI! Never write beyond rsp! subptr(rsp, 2 * wordSize); fstp_d(Address(rsp, 0)); } void InterpreterMacroAssembler::push(TosState state) { verify_oop(rax, state); switch (state) { case atos: push_ptr(rax); break; case btos: // fall through case ctos: // fall through case stos: // fall through case itos: push_i(rax); break; case ltos: push_l(rax, rdx); break; case ftos: push_f(); break; case dtos: push_d(rax); break; case vtos: /* nothing to do */ break; default : ShouldNotReachHere(); } } // Helpers for swap and dup void InterpreterMacroAssembler::load_ptr(int n, Register val) { movptr(val, Address(rsp, Interpreter::expr_offset_in_bytes(n))); } void InterpreterMacroAssembler::store_ptr(int n, Register val) { movptr(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val); } void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point) { MacroAssembler::call_VM_leaf_base(entry_point, 0); } void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point, Register arg_1) { push(arg_1); MacroAssembler::call_VM_leaf_base(entry_point, 1); } void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2) { push(arg_2); push(arg_1); MacroAssembler::call_VM_leaf_base(entry_point, 2); } void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3) { push(arg_3); push(arg_2); push(arg_1); MacroAssembler::call_VM_leaf_base(entry_point, 3); } void InterpreterMacroAssembler::prepare_to_jump_from_interpreted() { // set sender sp lea(rsi, Address(rsp, wordSize)); // record last_sp movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), rsi); } // 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. get_thread(temp); // interp_only is an int, on little endian it is sufficient to test the byte only // Is a cmpl faster (ce cmpb(Address(temp, JavaThread::interp_only_mode_offset()), 0); jcc(Assembler::zero, run_compiled_code); jmp(Address(method, methodOopDesc::interpreter_entry_offset())); bind(run_compiled_code); } jmp(Address(method, methodOopDesc::from_interpreted_offset())); } // The following two routines provide a hook so that an implementation // can schedule the dispatch in two parts. Intel does not do this. void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) { // Nothing Intel-specific to be done here. } void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) { dispatch_next(state, step); } void InterpreterMacroAssembler::dispatch_base(TosState state, address* table, bool verifyoop) { verify_FPU(1, state); if (VerifyActivationFrameSize) { Label L; mov(rcx, rbp); subptr(rcx, rsp); int min_frame_size = (frame::link_offset - frame::interpreter_frame_initial_sp_offset) * wordSize; cmpptr(rcx, min_frame_size); jcc(Assembler::greaterEqual, L); stop("broken stack frame"); bind(L); } if (verifyoop) verify_oop(rax, state); Address index(noreg, rbx, Address::times_ptr); ExternalAddress tbl((address)table); ArrayAddress dispatch(tbl, index); jump(dispatch); } void InterpreterMacroAssembler::dispatch_only(TosState state) { dispatch_base(state, Interpreter::dispatch_table(state)); } 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) { // load next bytecode (load before advancing rsi to prevent AGI) load_unsigned_byte(rbx, Address(rsi, step)); // advance rsi increment(rsi, step); dispatch_base(state, Interpreter::dispatch_table(state)); } void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { // load current bytecode load_unsigned_byte(rbx, Address(rsi, 0)); dispatch_base(state, table); } // remove activation // // 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, Register ret_addr, bool throw_monitor_exception, bool install_monitor_exception, bool notify_jvmdi) { // Note: Registers rax, rdx and FPU ST(0) may be in use for the result // check if synchronized method Label unlocked, unlock, no_unlock; get_thread(rcx); const Address do_not_unlock_if_synchronized(rcx, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); movbool(rbx, do_not_unlock_if_synchronized); mov(rdi,rbx); movbool(do_not_unlock_if_synchronized, false); // reset the flag movptr(rbx, Address(rbp, frame::interpreter_frame_method_offset * wordSize)); // get method access flags movl(rcx, Address(rbx, methodOopDesc::access_flags_offset())); testl(rcx, JVM_ACC_SYNCHRONIZED); jcc(Assembler::zero, unlocked); // Don't unlock anything if the _do_not_unlock_if_synchronized flag // is set. mov(rcx,rdi); testbool(rcx); jcc(Assembler::notZero, 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(rbp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock)); lea (rdx, monitor); // address of first monitor movptr (rax, Address(rdx, BasicObjectLock::obj_offset_in_bytes())); testptr(rax, rax); jcc (Assembler::notZero, unlock); pop(state); if (throw_monitor_exception) { empty_FPU_stack(); // remove possible return value from FPU-stack, otherwise stack could overflow // 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) { empty_FPU_stack(); // remove possible return value from FPU-stack, otherwise stack could overflow call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception)); } jmp(unlocked); } bind(unlock); unlock_object(rdx); pop(state); // Check that for block-structured locking (i.e., that all locked objects has been unlocked) bind(unlocked); // rax, rdx: 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(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize); const Address monitor_block_bot(rbp, frame::interpreter_frame_initial_sp_offset * wordSize); bind(restart); movptr(rcx, monitor_block_top); // points to current entry, starting with top-most entry lea(rbx, monitor_block_bot); // points to word before bottom of monitor block jmp(entry); // Entry already locked, need to throw exception bind(exception); if (throw_monitor_exception) { empty_FPU_stack(); // remove possible return value from FPU-stack, otherwise stack could overflow // Throw exception 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 push(state); mov(rdx, rcx); unlock_object(rdx); pop(state); if (install_monitor_exception) { empty_FPU_stack(); // remove possible return value from FPU-stack, otherwise stack could overflow call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception)); } jmp(restart); } bind(loop); cmpptr(Address(rcx, BasicObjectLock::obj_offset_in_bytes()), (int32_t)NULL_WORD); // check if current entry is used jcc(Assembler::notEqual, exception); addptr(rcx, entry_size); // otherwise advance to next entry bind(entry); cmpptr(rcx, rbx); // check if bottom reached jcc(Assembler::notEqual, 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 movptr(rbx, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp leave(); // remove frame anchor pop(ret_addr); // get return address mov(rsp, rbx); // set sp to sender sp if (UseSSE) { // float and double are returned in xmm register in SSE-mode if (state == ftos && UseSSE >= 1) { subptr(rsp, wordSize); fstp_s(Address(rsp, 0)); movflt(xmm0, Address(rsp, 0)); addptr(rsp, wordSize); } else if (state == dtos && UseSSE >= 2) { subptr(rsp, 2*wordSize); fstp_d(Address(rsp, 0)); movdbl(xmm0, Address(rsp, 0)); addptr(rsp, 2*wordSize); } } } #endif /* !CC_INTERP */ // Lock object // // Argument: rdx : Points to BasicObjectLock to be used for locking. Must // be initialized with object to lock void InterpreterMacroAssembler::lock_object(Register lock_reg) { assert(lock_reg == rdx, "The argument is only for looks. It must be rdx"); if (UseHeavyMonitors) { call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), lock_reg); } else { Label done; const Register swap_reg = rax; // Must use rax, for cmpxchg instruction const Register obj_reg = rcx; // 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 %rcx movptr(obj_reg, Address(lock_reg, obj_offset)); if (UseBiasedLocking) { // Note: we use noreg for the temporary register since it's hard // to come up with a free register on all incoming code paths biased_locking_enter(lock_reg, obj_reg, swap_reg, noreg, false, done, &slow_case); } // Load immediate 1 into swap_reg %rax, movptr(swap_reg, (int32_t)1); // Load (object->mark() | 1) into swap_reg %rax, orptr(swap_reg, Address(obj_reg, 0)); // Save (object->mark() | 1) into BasicLock's displaced header movptr(Address(lock_reg, mark_offset), swap_reg); assert(lock_offset == 0, "displached header must be first word in BasicObjectLock"); if (os::is_MP()) { lock(); } cmpxchgptr(lock_reg, Address(obj_reg, 0)); if (PrintBiasedLockingStatistics) { cond_inc32(Assembler::zero, ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr())); } jcc(Assembler::zero, done); // Test if the oopMark is an obvious stack pointer, i.e., // 1) (mark & 3) == 0, and // 2) rsp <= mark < mark + os::pagesize() // // These 3 tests can be done by evaluating the following // expression: ((mark - rsp) & (3 - os::vm_page_size())), // assuming both stack pointer and pagesize have their // least significant 2 bits clear. // NOTE: the oopMark is in swap_reg %rax, as the result of cmpxchg subptr(swap_reg, rsp); andptr(swap_reg, 3 - os::vm_page_size()); // Save the test result, for recursive case, the result is zero movptr(Address(lock_reg, mark_offset), swap_reg); if (PrintBiasedLockingStatistics) { cond_inc32(Assembler::zero, ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr())); } jcc(Assembler::zero, 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. // // Argument: rdx : Points to BasicObjectLock structure for lock // Throw an IllegalMonitorException if object is not locked by current thread // // Uses: rax, rbx, rcx, rdx void InterpreterMacroAssembler::unlock_object(Register lock_reg) { assert(lock_reg == rdx, "The argument is only for looks. It must be rdx"); if (UseHeavyMonitors) { call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg); } else { Label done; const Register swap_reg = rax; // Must use rax, for cmpxchg instruction const Register header_reg = rbx; // Will contain the old oopMark const Register obj_reg = rcx; // 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 %rax, lea(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); // Load oop into obj_reg(%rcx) movptr(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes ())); // Free entry movptr(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()), NULL_WORD); if (UseBiasedLocking) { biased_locking_exit(obj_reg, header_reg, done); } // Load the old header from BasicLock structure movptr(header_reg, Address(swap_reg, BasicLock::displaced_header_offset_in_bytes())); // Test for recursion testptr(header_reg, header_reg); // zero for recursive case jcc(Assembler::zero, done); // Atomic swap back the old header if (os::is_MP()) lock(); cmpxchgptr(header_reg, Address(obj_reg, 0)); // zero for recursive case jcc(Assembler::zero, done); // Call the runtime routine for slow case. movptr(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()), obj_reg); // restore obj call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg); bind(done); restore_bcp(); } } #ifndef CC_INTERP // Test ImethodDataPtr. If it is null, continue at the specified label void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, Label& zero_continue) { assert(ProfileInterpreter, "must be profiling interpreter"); movptr(mdp, Address(rbp, frame::interpreter_frame_mdx_offset * wordSize)); testptr(mdp, mdp); jcc(Assembler::zero, 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; push(rax); push(rbx); get_method(rbx); // Test MDO to avoid the call if it is NULL. movptr(rax, Address(rbx, in_bytes(methodOopDesc::method_data_offset()))); testptr(rax, rax); jcc(Assembler::zero, set_mdp); // rbx,: method // rsi: bcp call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rbx, rsi); // rax,: mdi // mdo is guaranteed to be non-zero here, we checked for it before the call. movptr(rbx, Address(rbx, in_bytes(methodOopDesc::method_data_offset()))); addptr(rbx, in_bytes(methodDataOopDesc::data_offset())); addptr(rax, rbx); bind(set_mdp); movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rax); pop(rbx); pop(rax); } void InterpreterMacroAssembler::verify_method_data_pointer() { assert(ProfileInterpreter, "must be profiling interpreter"); #ifdef ASSERT Label verify_continue; push(rax); push(rbx); push(rcx); push(rdx); test_method_data_pointer(rcx, verify_continue); // If mdp is zero, continue get_method(rbx); // If the mdp is valid, it will point to a DataLayout header which is // consistent with the bcp. The converse is highly probable also. load_unsigned_short(rdx, Address(rcx, in_bytes(DataLayout::bci_offset()))); addptr(rdx, Address(rbx, methodOopDesc::const_offset())); lea(rdx, Address(rdx, constMethodOopDesc::codes_offset())); cmpptr(rdx, rsi); jcc(Assembler::equal, verify_continue); // rbx,: method // rsi: bcp // rcx: mdp call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), rbx, rsi, rcx); bind(verify_continue); pop(rdx); pop(rcx); pop(rbx); pop(rax); #endif // ASSERT } void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, int constant, Register value) { // %%% this seems to be used to store counter data which is surely 32bits // however 64bit side stores 64 bits which seems wrong assert(ProfileInterpreter, "must be profiling interpreter"); Address data(mdp_in, constant); movptr(data, value); } void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, int constant, bool decrement) { // Counter address Address data(mdp_in, constant); increment_mdp_data_at(data, decrement); } void InterpreterMacroAssembler::increment_mdp_data_at(Address data, bool decrement) { assert( DataLayout::counter_increment==1, "flow-free idiom only works with 1" ); assert(ProfileInterpreter, "must be profiling interpreter"); // %%% 64bit treats this as 64 bit which seems unlikely if (decrement) { // Decrement the register. Set condition codes. addl(data, -DataLayout::counter_increment); // If the decrement causes the counter to overflow, stay negative Label L; jcc(Assembler::negative, L); addl(data, DataLayout::counter_increment); bind(L); } else { assert(DataLayout::counter_increment == 1, "flow-free idiom only works with 1"); // Increment the register. Set carry flag. addl(data, DataLayout::counter_increment); // If the increment causes the counter to overflow, pull back by 1. sbbl(data, 0); } } void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in, Register reg, int constant, bool decrement) { Address data(mdp_in, reg, Address::times_1, constant); increment_mdp_data_at(data, decrement); } void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in, int flag_byte_constant) { assert(ProfileInterpreter, "must be profiling interpreter"); int header_offset = in_bytes(DataLayout::header_offset()); int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant); // Set the flag orl(Address(mdp_in, header_offset), header_bits); } 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) { cmpptr(value, Address(mdp_in, offset)); } else { // Put the test value into a register, so caller can use it: movptr(test_value_out, Address(mdp_in, offset)); cmpptr(test_value_out, value); } jcc(Assembler::notEqual, not_equal_continue); } void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, int offset_of_disp) { assert(ProfileInterpreter, "must be profiling interpreter"); Address disp_address(mdp_in, offset_of_disp); addptr(mdp_in,disp_address); movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); } void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, Register reg, int offset_of_disp) { assert(ProfileInterpreter, "must be profiling interpreter"); Address disp_address(mdp_in, reg, Address::times_1, offset_of_disp); addptr(mdp_in, disp_address); movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); } void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, int constant) { assert(ProfileInterpreter, "must be profiling interpreter"); addptr(mdp_in, constant); movptr(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); } void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { assert(ProfileInterpreter, "must be profiling interpreter"); push(return_bci); // save/restore across call_VM call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), return_bci); pop(return_bci); } 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())); // %%% 64bit treats these cells as 64 bit but they seem to be 32 bit movl(bumped_count,data); assert( DataLayout::counter_increment==1, "flow-free idiom only works with 1" ); addl(bumped_count, DataLayout::counter_increment); sbbl(bumped_count, 0); movl(data,bumped_count); // Store back out // 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; testptr(receiver, receiver); jccb(Assembler::notZero, not_null); // We are making a call. Increment the count for null receiver. increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); jmp(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); } } 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())); } return; } int last_row = VirtualCallData::row_limit() - 1; assert(start_row <= last_row, "must be work left to do"); // Test this row for both the receiver and for null. // Take any of three different outcomes: // 1. found receiver => 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 receiver is receiver[n]. int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row)); test_mdp_data_at(mdp, recvr_offset, receiver, (test_for_null_also ? reg2 : noreg), next_test); // (Reg2 now contains the receiver from the CallData.) // The receiver is receiver[n]. Increment count[n]. int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row)); increment_mdp_data_at(mdp, count_offset); jmp(done); bind(next_test); if (row == start_row) { Label found_null; // Failed the equality check on receiver[n]... Test for null. testptr(reg2, reg2); if (start_row == last_row) { // The only thing left to do is handle the null case. if (is_virtual_call) { jccb(Assembler::zero, found_null); // Receiver did not match any saved receiver and there is no empty row for it. // Increment total counter to indicate polymorphic case. increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset())); jmp(done); bind(found_null); } else { jcc(Assembler::notZero, done); } break; } // Since null is rare, make it be the branch-taken case. jcc(Assembler::zero, found_null); // Put all the "Case 3" tests here. record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done, is_virtual_call); // Found a null. Keep searching for a matching receiver, // but remember that this is an empty (unused) slot. bind(found_null); } } // In the fall-through case, we found no matching receiver, but we // observed the receiver[start_row] is NULL. // Fill in the receiver field and increment the count. int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row)); set_mdp_data_at(mdp, recvr_offset, receiver); int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row)); movptr(reg2, (int32_t)DataLayout::counter_increment); set_mdp_data_at(mdp, count_offset, reg2); if (start_row > 0) { jmp(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))); jmp(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); assert(reg2 == rdi, "we know how to fix this blown reg"); restore_locals(); // Restore EDI } 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() movptr(reg2, (int32_t)in_bytes(MultiBranchData::per_case_size())); // index is positive and so should have correct value if this code were // used on 64bits imulptr(index, reg2); addptr(index, in_bytes(MultiBranchData::case_array_offset())); // 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); } } #endif // !CC_INTERP void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { if (state == atos) MacroAssembler::verify_oop(reg); } #ifndef CC_INTERP void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { if (state == ftos || state == dtos) MacroAssembler::verify_FPU(stack_depth); } #endif /* CC_INTERP */ 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; get_thread(rcx); movl(rcx, Address(rcx, JavaThread::interp_only_mode_offset())); testl(rcx,rcx); jcc(Assembler::zero, L); call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry)); bind(L); } { SkipIfEqual skip_if(this, &DTraceMethodProbes, 0); get_thread(rcx); get_method(rbx); call_VM_leaf( CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), rcx, rbx); } // RedefineClasses() tracing support for obsolete method entry if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) { get_thread(rcx); get_method(rbx); call_VM_leaf( CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry), rcx, rbx); } } 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. // For c++ interpreter the result is always stored at a known location in the frame // template interpreter will leave it on the top of the stack. NOT_CC_INTERP(push(state);) get_thread(rcx); movl(rcx, Address(rcx, JavaThread::interp_only_mode_offset())); testl(rcx,rcx); jcc(Assembler::zero, L); call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); bind(L); NOT_CC_INTERP(pop(state);) } { SkipIfEqual skip_if(this, &DTraceMethodProbes, 0); NOT_CC_INTERP(push(state)); get_thread(rbx); get_method(rcx); call_VM_leaf( CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), rbx, rcx); NOT_CC_INTERP(pop(state)); } } // Jump if ((*counter_addr += increment) & mask) satisfies the condition. void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr, int increment, int mask, Register scratch, bool preloaded, Condition cond, Label* where) { if (!preloaded) { movl(scratch, counter_addr); } incrementl(scratch, increment); movl(counter_addr, scratch); andl(scratch, mask); jcc(cond, *where); }