Mercurial > hg > openjdk7.svn
view hotspot/src/cpu/i486/vm/interp_masm_i486.cpp @ 3:64ed597c0ad3 trunk
[svn] Load openjdk/jdk7/b15 into jdk/trunk.
author | xiomara |
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date | Thu, 05 Jul 2007 23:47:33 +0000 |
parents | 16f2b6c91171 |
children | 27e0bf49438e |
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#ifdef USE_PRAGMA_IDENT_SRC #pragma ident "@(#)interp_masm_i486.cpp 1.168 07/06/19 09:08:07 JVM" #endif /* * Copyright 1997-2007 Sun Microsystems, 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_interp_masm_i486.cpp.incl" // Implementation of InterpreterMacroAssembler void InterpreterMacroAssembler::call_VM_leaf_base( address entry_point, int number_of_arguments ) { // interpreter specific // // Note: No need to save/restore bcp & locals (esi & edi) 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 esi/edi 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; cmpl(Address(ebp, frame::interpreter_frame_last_sp_offset * wordSize), 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 esi/edi 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; cmpl(Address(ebp, frame::interpreter_frame_last_sp_offset * wordSize), 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(eax); bind(L); get_thread(java_thread); } } void InterpreterMacroAssembler::load_earlyret_value(TosState state) { get_thread(ecx); movl(ecx, Address(ecx, JavaThread::jvmti_thread_state_offset())); const Address tos_addr (ecx, JvmtiThreadState::earlyret_tos_offset()); const Address oop_addr (ecx, JvmtiThreadState::earlyret_oop_offset()); const Address val_addr (ecx, JvmtiThreadState::earlyret_value_offset()); const Address val_addr1(ecx, JvmtiThreadState::earlyret_value_offset() + in_ByteSize(wordSize)); switch (state) { case atos: movl(eax, oop_addr); movl(oop_addr, NULL_WORD); verify_oop(eax, state); break; case ltos: movl(edx, val_addr1); // fall through case btos: // fall through case ctos: // fall through case stos: // fall through case itos: movl(eax, 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, (int) ilgl); movl(val_addr, NULL_WORD); movl(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; movl(tmp, Address(tmp, JavaThread::jvmti_thread_state_offset())); testl(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); movl(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(eax); 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(esi, bcp_offset)); bswap(reg); shrl(reg, 16); } void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache, Register index, int bcp_offset) { assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); assert(cache != index, "must use different registers"); load_unsigned_word(index, Address(esi, bcp_offset)); movl(cache, Address(ebp, frame::interpreter_frame_cache_offset * wordSize)); assert(sizeof(ConstantPoolCacheEntry) == 4*wordSize, "adjust code below"); shll(index, 2); // convert from field index to ConstantPoolCacheEntry index } void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache, Register tmp, int bcp_offset) { assert(bcp_offset > 0, "bcp is still pointing to start of bytecode"); assert(cache != tmp, "must use different register"); load_unsigned_word(tmp, Address(esi, bcp_offset)); 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); movl(cache, Address(ebp, frame::interpreter_frame_cache_offset * wordSize)); // skip past the header addl(cache, in_bytes(constantPoolCacheOopDesc::base_offset())); addl(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 != eax, "eax holds superklass" ); assert( Rsub_klass != ecx, "ecx holds 2ndary super array length" ); assert( Rsub_klass != edi, "edi holds 2ndary super array scan ptr" ); Label not_subtype, loop; // Profile the not-null value's klass. profile_typecheck(ecx, Rsub_klass, edi); // blows ecx, edi // Load the super-klass's check offset into ECX movl( ecx, Address(eax, sizeof(oopDesc) + Klass::super_check_offset_offset_in_bytes() ) ); // Load from the sub-klass's super-class display list, or a 1-word cache of // the secondary superclass list, or a failing value with a sentinel offset // if the super-klass is an interface or exceptionally deep in the Java // hierarchy and we have to scan the secondary superclass list the hard way. // See if we get an immediate positive hit cmpl( eax, Address(Rsub_klass,ecx,Address::times_1) ); jcc( Assembler::equal,ok_is_subtype ); // Check for immediate negative hit cmpl( ecx, sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes() ); jcc( Assembler::notEqual, not_subtype ); // Check for self cmpl( Rsub_klass, eax ); jcc( Assembler::equal, ok_is_subtype ); // Now do a linear scan of the secondary super-klass chain. movl( edi, Address(Rsub_klass, sizeof(oopDesc) + Klass::secondary_supers_offset_in_bytes()) ); // EDI holds the objArrayOop of secondary supers. movl( ecx, Address(edi, arrayOopDesc::length_offset_in_bytes()));// Load the array length // Skip to start of data; also clear Z flag incase ECX is zero addl( edi, arrayOopDesc::base_offset_in_bytes(T_OBJECT) ); // Scan ECX words at [EDI] for occurance of EAX // Set NZ/Z based on last compare repne_scan(); restore_locals(); // Restore EDI; Must not blow flags // Not equal? jcc( Assembler::notEqual, not_subtype ); // Must be equal but missed in cache. Update cache. movl( Address(Rsub_klass, sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes()), eax ); jmp( ok_is_subtype ); bind(not_subtype); profile_typecheck_failed(ecx); // blows ecx } void InterpreterMacroAssembler::f2ieee() { if (IEEEPrecision) { fstp_s(Address(esp, 0)); fld_s(Address(esp, 0)); } } void InterpreterMacroAssembler::d2ieee() { if (IEEEPrecision) { fstp_d(Address(esp, 0)); fld_d(Address(esp, 0)); } } // Java Expression Stack #ifdef ASSERT void InterpreterMacroAssembler::verify_stack_tag(frame::Tag t) { if (TaggedStackInterpreter) { Label okay; cmpl(Address(esp, wordSize), (int)t); jcc(Assembler::equal, okay); // Also compare if the stack value is zero, then the tag might // not have been set coming from deopt. cmpl(Address(esp, 0), 0); jcc(Assembler::equal, okay); stop("Java Expression stack tag value is bad"); bind(okay); } } #endif // ASSERT void InterpreterMacroAssembler::pop_ptr(Register r) { debug_only(verify_stack_tag(frame::TagReference)); popl(r); if (TaggedStackInterpreter) addl(esp, 1 * wordSize); } void InterpreterMacroAssembler::pop_ptr(Register r, Register tag) { popl(r); // Tag may not be reference for jsr, can be returnAddress if (TaggedStackInterpreter) popl(tag); } void InterpreterMacroAssembler::pop_i(Register r) { debug_only(verify_stack_tag(frame::TagValue)); popl(r); if (TaggedStackInterpreter) addl(esp, 1 * wordSize); } void InterpreterMacroAssembler::pop_l(Register lo, Register hi) { debug_only(verify_stack_tag(frame::TagValue)); popl(lo); if (TaggedStackInterpreter) addl(esp, 1 * wordSize); debug_only(verify_stack_tag(frame::TagValue)); popl(hi); if (TaggedStackInterpreter) addl(esp, 1 * wordSize); } void InterpreterMacroAssembler::pop_f() { debug_only(verify_stack_tag(frame::TagValue)); fld_s(Address(esp, 0)); addl(esp, 1 * wordSize); if (TaggedStackInterpreter) addl(esp, 1 * wordSize); } void InterpreterMacroAssembler::pop_d() { // Write double to stack contiguously and load into ST0 pop_dtos_to_esp(); fld_d(Address(esp, 0)); addl(esp, 2 * wordSize); } // Pop the top of the java expression stack to execution stack (which // happens to be the same place). void InterpreterMacroAssembler::pop_dtos_to_esp() { if (TaggedStackInterpreter) { // Pop double value into scratch registers debug_only(verify_stack_tag(frame::TagValue)); popl(eax); addl(esp, 1* wordSize); debug_only(verify_stack_tag(frame::TagValue)); popl(edx); addl(esp, 1* wordSize); pushl(edx); pushl(eax); } } void InterpreterMacroAssembler::pop_ftos_to_esp() { if (TaggedStackInterpreter) { debug_only(verify_stack_tag(frame::TagValue)); popl(eax); addl(esp, 1 * wordSize); pushl(eax); // ftos is at esp } } void InterpreterMacroAssembler::pop(TosState state) { switch (state) { case atos: pop_ptr(eax); break; case btos: // fall through case ctos: // fall through case stos: // fall through case itos: pop_i(eax); break; case ltos: pop_l(eax, edx); break; case ftos: pop_f(); break; case dtos: pop_d(); break; case vtos: /* nothing to do */ break; default : ShouldNotReachHere(); } verify_oop(eax, state); } void InterpreterMacroAssembler::push_ptr(Register r) { if (TaggedStackInterpreter) pushl(frame::TagReference); pushl(r); } void InterpreterMacroAssembler::push_ptr(Register r, Register tag) { if (TaggedStackInterpreter) pushl(tag); // tag first pushl(r); } void InterpreterMacroAssembler::push_i(Register r) { if (TaggedStackInterpreter) pushl(frame::TagValue); pushl(r); } void InterpreterMacroAssembler::push_l(Register lo, Register hi) { if (TaggedStackInterpreter) pushl(frame::TagValue); pushl(hi); if (TaggedStackInterpreter) pushl(frame::TagValue); pushl(lo); } void InterpreterMacroAssembler::push_f() { if (TaggedStackInterpreter) pushl(frame::TagValue); // Do not schedule for no AGI! Never write beyond esp! subl(esp, 1 * wordSize); fstp_s(Address(esp, 0)); } void InterpreterMacroAssembler::push_d(Register r) { if (TaggedStackInterpreter) { // Double values are stored as: // tag // high // tag // low pushl(frame::TagValue); subl(esp, 3 * wordSize); fstp_d(Address(esp, 0)); // move high word up to slot n-1 movl(r, Address(esp, 1*wordSize)); movl(Address(esp, 2*wordSize), r); // move tag movl(Address(esp, 1*wordSize), frame::TagValue); } else { // Do not schedule for no AGI! Never write beyond esp! subl(esp, 2 * wordSize); fstp_d(Address(esp, 0)); } } void InterpreterMacroAssembler::push(TosState state) { verify_oop(eax, state); switch (state) { case atos: push_ptr(eax); break; case btos: // fall through case ctos: // fall through case stos: // fall through case itos: push_i(eax); break; case ltos: push_l(eax, edx); break; case ftos: push_f(); break; case dtos: push_d(eax); break; case vtos: /* nothing to do */ break; default : ShouldNotReachHere(); } } // Tagged stack helpers for swap and dup void InterpreterMacroAssembler::load_ptr_and_tag(int n, Register val, Register tag) { movl(val, Address(esp, Interpreter::expr_offset_in_bytes(n))); if (TaggedStackInterpreter) { movl(tag, Address(esp, Interpreter::expr_tag_offset_in_bytes(n))); } } void InterpreterMacroAssembler::store_ptr_and_tag(int n, Register val, Register tag) { movl(Address(esp, Interpreter::expr_offset_in_bytes(n)), val); if (TaggedStackInterpreter) { movl(Address(esp, Interpreter::expr_tag_offset_in_bytes(n)), tag); } } // Tagged local support void InterpreterMacroAssembler::tag_local(frame::Tag tag, int n) { if (TaggedStackInterpreter) { if (tag == frame::TagCategory2) { movl(Address(edi, Interpreter::local_tag_offset_in_bytes(n+1)), (int)frame::TagValue); movl(Address(edi, Interpreter::local_tag_offset_in_bytes(n)), (int)frame::TagValue); } else { movl(Address(edi, Interpreter::local_tag_offset_in_bytes(n)), (int)tag); } } } void InterpreterMacroAssembler::tag_local(frame::Tag tag, Register idx) { if (TaggedStackInterpreter) { if (tag == frame::TagCategory2) { movl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(1)), (int)frame::TagValue); movl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(0)), (int)frame::TagValue); } else { movl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(0)), (int)tag); } } } void InterpreterMacroAssembler::tag_local(Register tag, Register idx) { if (TaggedStackInterpreter) { // can only be TagValue or TagReference movl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(0)), tag); } } void InterpreterMacroAssembler::tag_local(Register tag, int n) { if (TaggedStackInterpreter) { // can only be TagValue or TagReference movl(Address(edi, Interpreter::local_tag_offset_in_bytes(n)), tag); } } #ifdef ASSERT void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, int n) { if (TaggedStackInterpreter) { frame::Tag t = tag; if (tag == frame::TagCategory2) { Label nbl; t = frame::TagValue; // change to what is stored in locals cmpl(Address(edi, Interpreter::local_tag_offset_in_bytes(n+1)), (int)t); jcc(Assembler::equal, nbl); stop("Local tag is bad for long/double"); bind(nbl); } Label notBad; cmpl(Address(edi, Interpreter::local_tag_offset_in_bytes(n)), (int)t); jcc(Assembler::equal, notBad); // Also compare if the local value is zero, then the tag might // not have been set coming from deopt. cmpl(Address(edi, Interpreter::local_offset_in_bytes(n)), 0); jcc(Assembler::equal, notBad); stop("Local tag is bad"); bind(notBad); } } void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, Register idx) { if (TaggedStackInterpreter) { frame::Tag t = tag; if (tag == frame::TagCategory2) { Label nbl; t = frame::TagValue; // change to what is stored in locals cmpl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(1)), (int)t); jcc(Assembler::equal, nbl); stop("Local tag is bad for long/double"); bind(nbl); } Label notBad; cmpl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_tag_offset_in_bytes(0)), (int)t); jcc(Assembler::equal, notBad); // Also compare if the local value is zero, then the tag might // not have been set coming from deopt. cmpl(Address(edi, idx, Interpreter::stackElementScale(), Interpreter::local_offset_in_bytes(0)), 0); jcc(Assembler::equal, notBad); stop("Local tag is bad"); bind(notBad); } } #endif // ASSERT 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) { pushl(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) { pushl(arg_2); pushl(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) { pushl(arg_3); pushl(arg_2); pushl(arg_1); MacroAssembler::call_VM_leaf_base(entry_point, 3); } // 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) { // set sender sp leal(esi, Address(esp, wordSize)); // record last_sp movl(Address(ebp, frame::interpreter_frame_last_sp_offset * wordSize), esi); 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; movl(ecx, ebp); subl(ecx, esp); int min_frame_size = (frame::link_offset - frame::interpreter_frame_initial_sp_offset) * wordSize; cmpl(ecx, min_frame_size); jcc(Assembler::greaterEqual, L); stop("broken stack frame"); bind(L); } if (verifyoop) verify_oop(eax, state); Address index(noreg, ebx, Address::times_4); 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 esi to prevent AGI) load_unsigned_byte(ebx, Address(esi, step)); // advance esi increment(esi, step); dispatch_base(state, Interpreter::dispatch_table(state)); } void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) { // load current bytecode load_unsigned_byte(ebx, Address(esi, 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 eax, edx and FPU ST(0) may be in use for the result // check if synchronized method Label unlocked, unlock, no_unlock; get_thread(ecx); const Address do_not_unlock_if_synchronized(ecx, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); movbool(ebx, do_not_unlock_if_synchronized); movl(edi,ebx); movbool(do_not_unlock_if_synchronized, false); // reset the flag movl(ebx, Address(ebp, frame::interpreter_frame_method_offset * wordSize)); // get method access flags movl(ecx, Address(ebx, methodOopDesc::access_flags_offset())); testl(ecx, JVM_ACC_SYNCHRONIZED); jcc(Assembler::zero, unlocked); // Don't unlock anything if the _do_not_unlock_if_synchronized flag // is set. movl(ecx,edi); testbool(ecx); 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(ebp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock)); leal (edx, monitor); // address of first monitor movl (eax, Address(edx, BasicObjectLock::obj_offset_in_bytes())); testl (eax, eax); 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(edx); pop(state); // Check that for block-structured locking (i.e., that all locked objects has been unlocked) bind(unlocked); // eax, edx: 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(ebp, frame::interpreter_frame_monitor_block_top_offset * wordSize); const Address monitor_block_bot(ebp, frame::interpreter_frame_initial_sp_offset * wordSize); bind(restart); movl(ecx, monitor_block_top); // points to current entry, starting with top-most entry leal(ebx, 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); movl(edx, ecx); unlock_object(edx); 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); cmpl(Address(ecx, BasicObjectLock::obj_offset_in_bytes()), NULL_WORD); // check if current entry is used jcc(Assembler::notEqual, exception); addl(ecx, entry_size); // otherwise advance to next entry bind(entry); cmpl(ecx, ebx); // 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 movl(ebx, Address(ebp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp leave(); // remove frame anchor popl(ret_addr); // get return address movl(esp, ebx); // set sp to sender sp if (UseSSE) { // float and double are returned in xmm register in SSE-mode if (state == ftos && UseSSE >= 1) { subl(esp, wordSize); fstp_s(Address(esp, 0)); movflt(xmm0, Address(esp, 0)); addl(esp, wordSize); } else if (state == dtos && UseSSE >= 2) { subl(esp, 2*wordSize); fstp_d(Address(esp, 0)); movdbl(xmm0, Address(esp, 0)); addl(esp, 2*wordSize); } } } // Lock object // // Argument: edx : 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 == edx, "The argument is only for looks. It must be edx"); if (UseHeavyMonitors) { call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), lock_reg); } else { Label done; const Register swap_reg = eax; // Must use eax for cmpxchg instruction const Register obj_reg = ecx; // 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 %ecx movl(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 %eax movl(swap_reg, 1); // Load (object->mark() | 1) into swap_reg %eax orl(swap_reg, Address(obj_reg, 0)); // Save (object->mark() | 1) into BasicLock's displaced header movl(Address(lock_reg, mark_offset), swap_reg); assert(lock_offset == 0, "displached header must be first word in BasicObjectLock"); if (os::is_MP()) { lock(); } cmpxchg(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) esp <= mark < mark + os::pagesize() // // These 3 tests can be done by evaluating the following // expression: ((mark - esp) & (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 %eax as the result of cmpxchg subl(swap_reg, esp); andl(swap_reg, 3 - os::vm_page_size()); // Save the test result, for recursive case, the result is zero movl(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: edx : Points to BasicObjectLock structure for lock // Throw an IllegalMonitorException if object is not locked by current thread // // Uses: eax, ebx, ecx, edx void InterpreterMacroAssembler::unlock_object(Register lock_reg) { assert(lock_reg == edx, "The argument is only for looks. It must be edx"); if (UseHeavyMonitors) { call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), lock_reg); } else { Label done; const Register swap_reg = eax; // Must use eax for cmpxchg instruction const Register header_reg = ebx; // Will contain the old oopMark const Register obj_reg = ecx; // 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 %eax leal(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes())); // Load oop into obj_reg(%ecx) movl(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes ())); // Free entry movl(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 movl(header_reg, Address(swap_reg, BasicLock::displaced_header_offset_in_bytes())); // Test for recursion testl(header_reg, header_reg); // zero for recursive case jcc(Assembler::zero, done); // Atomic swap back the old header if (os::is_MP()) lock(); cmpxchg(header_reg, Address(obj_reg, 0)); // zero for recursive case jcc(Assembler::zero, done); // Call the runtime routine for slow case. movl(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(); } } // 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"); movl(mdp, Address(ebp, frame::interpreter_frame_mdx_offset * wordSize)); testl(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 zero_continue; pushl(eax); pushl(ebx); get_method(ebx); // Test MDO to avoid the call if it is NULL. movl(eax, Address(ebx, in_bytes(methodOopDesc::method_data_offset()))); testl(eax, eax); jcc(Assembler::zero, zero_continue); // ebx: method // esi: bcp call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), ebx, esi); // eax: mdi movl(ebx, Address(ebx, in_bytes(methodOopDesc::method_data_offset()))); testl(ebx, ebx); jcc(Assembler::zero, zero_continue); addl(ebx, in_bytes(methodDataOopDesc::data_offset())); addl(ebx, eax); movl(Address(ebp, frame::interpreter_frame_mdx_offset * wordSize), ebx); bind(zero_continue); popl(ebx); popl(eax); } void InterpreterMacroAssembler::verify_method_data_pointer() { assert(ProfileInterpreter, "must be profiling interpreter"); #ifdef ASSERT Label verify_continue; pushl(eax); pushl(ebx); pushl(ecx); pushl(edx); test_method_data_pointer(ecx, verify_continue); // If mdp is zero, continue get_method(ebx); // 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_word(edx, Address(ecx, in_bytes(DataLayout::bci_offset()))); addl(edx, Address(ebx, methodOopDesc::const_offset())); leal(edx, Address(edx, constMethodOopDesc::codes_offset())); cmpl(edx, esi); jcc(Assembler::equal, verify_continue); // ebx: method // esi: bcp // ecx: mdp call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), ebx, esi, ecx); bind(verify_continue); popl(edx); popl(ecx); popl(ebx); popl(eax); #endif // ASSERT } void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, int constant, Register value) { assert(ProfileInterpreter, "must be profiling interpreter"); Address data(mdp_in, constant); movl(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"); 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) { cmpl(value, Address(mdp_in, offset)); } else { // Put the test value into a register, so caller can use it: movl(test_value_out, Address(mdp_in, offset)); cmpl(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); addl(mdp_in,disp_address); movl(Address(ebp, 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); addl(mdp_in, disp_address); movl(Address(ebp, 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"); addl(mdp_in, constant); movl(Address(ebp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in); } void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) { assert(ProfileInterpreter, "must be profiling interpreter"); pushl(return_bci); // save/restore across call_VM call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret), return_bci); popl(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())); 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) { 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())); // Record the receiver type. record_klass_in_profile(receiver, mdp, reg2); // 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) { 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) { // Failed the equality check on receiver[n]... Test for null. testl(reg2, reg2); if (start_row == last_row) { // The only thing left to do is handle the null case. jcc(Assembler::notZero, done); break; } // Since null is rare, make it be the branch-taken case. Label found_null; jcc(Assembler::zero, found_null); // Put all the "Case 3" tests here. record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done); // 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)); movl(reg2, DataLayout::counter_increment); set_mdp_data_at(mdp, count_offset, reg2); jmp(done); } void InterpreterMacroAssembler::record_klass_in_profile(Register receiver, Register mdp, Register reg2) { assert(ProfileInterpreter, "must be profiling"); Label done; record_klass_in_profile_helper(receiver, mdp, reg2, 0, done); 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); assert(reg2 == edi, "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() movl(reg2, in_bytes(MultiBranchData::per_case_size())); imull(index, reg2); addl(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); } } void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { if (state == atos) MacroAssembler::verify_oop(reg); } void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) { if (state == ftos || state == dtos) MacroAssembler::verify_FPU(stack_depth); } 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(ecx); movl(ecx, Address(ecx, JavaThread::interp_only_mode_offset())); testl(ecx,ecx); 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(ecx); get_method(ebx); call_VM_leaf( CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), ecx, ebx); } } 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. push(state); get_thread(ecx); movl(ecx, Address(ecx, JavaThread::interp_only_mode_offset())); testl(ecx,ecx); jcc(Assembler::zero, L); call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit)); bind(L); pop(state); } { SkipIfEqual skip_if(this, &DTraceMethodProbes, 0); push(state); get_thread(ebx); get_method(ecx); #ifdef ASSERT // edi has been trashed and doesn't match the locals pointer in the frame // anymore. This is fine since nobody is using it, but there's an assert // in call_VM_leaf() that requires that they match after the call. Let's // zap both so the assert is satisfied and nobody uses a correct edi later // on by mistake. movl(Address(ebp, frame::interpreter_frame_locals_offset * wordSize), NULL_WORD); movl(edi, NULL_WORD); #endif // def ASSERT call_VM_leaf( CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), ebx, ecx); pop(state); } }