author | hseigel |
Thu, 15 Aug 2013 20:04:10 -0400 | |
changeset 19319 | 0ad35be0733a |
parent 14626 | 0cf4eccf130f |
child 19979 | ebe1dbb6e1aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "asm/macroAssembler.hpp" |
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#include "code/vtableStubs.hpp" |
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#include "interp_masm_x86_64.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/instanceKlass.hpp" |
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#include "oops/klassVtable.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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#include "vmreg_x86.inline.hpp" |
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#ifdef COMPILER2 |
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#include "opto/runtime.hpp" |
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#endif |
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// machine-dependent part of VtableStubs: create VtableStub of correct size and |
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// initialize its code |
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#define __ masm-> |
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#ifndef PRODUCT |
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extern "C" void bad_compiled_vtable_index(JavaThread* thread, |
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oop receiver, |
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int index); |
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#endif |
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
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const int amd64_code_length = VtableStub::pd_code_size_limit(true); |
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VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index); |
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ResourceMark rm; |
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CodeBuffer cb(s->entry_point(), amd64_code_length); |
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MacroAssembler* masm = new MacroAssembler(&cb); |
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#ifndef PRODUCT |
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if (CountCompiledCalls) { |
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__ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
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} |
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#endif |
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// get receiver (need to skip return address on top of stack) |
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assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); |
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// Free registers (non-args) are rax, rbx |
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// get receiver klass |
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address npe_addr = __ pc(); |
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__ load_klass(rax, j_rarg0); |
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#ifndef PRODUCT |
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if (DebugVtables) { |
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Label L; |
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// check offset vs vtable length |
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__ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize), |
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vtable_index * vtableEntry::size()); |
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__ jcc(Assembler::greater, L); |
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__ movl(rbx, vtable_index); |
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__ call_VM(noreg, |
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CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx); |
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__ bind(L); |
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} |
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#endif // PRODUCT |
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||
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// load Method* and target address |
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const Register method = rbx; |
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__ lookup_virtual_method(rax, vtable_index, method); |
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if (DebugVtables) { |
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Label L; |
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__ cmpptr(method, (int32_t)NULL_WORD); |
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__ jcc(Assembler::equal, L); |
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__ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
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__ jcc(Assembler::notZero, L); |
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__ stop("Vtable entry is NULL"); |
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__ bind(L); |
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} |
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// rax: receiver klass |
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// rbx: Method* |
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// rcx: receiver |
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address ame_addr = __ pc(); |
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__ jmp( Address(rbx, Method::from_compiled_offset())); |
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__ flush(); |
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if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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vtable_index, s->entry_point(), |
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(int)(s->code_end() - s->entry_point()), |
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(int)(s->code_end() - __ pc())); |
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} |
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guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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// shut the door on sizing bugs |
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int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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s->set_exception_points(npe_addr, ame_addr); |
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return s; |
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} |
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VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
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// Note well: pd_code_size_limit is the absolute minimum we can get |
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// away with. If you add code here, bump the code stub size |
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// returned by pd_code_size_limit! |
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const int amd64_code_length = VtableStub::pd_code_size_limit(false); |
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VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index); |
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ResourceMark rm; |
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CodeBuffer cb(s->entry_point(), amd64_code_length); |
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MacroAssembler* masm = new MacroAssembler(&cb); |
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#ifndef PRODUCT |
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if (CountCompiledCalls) { |
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__ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
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} |
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#endif |
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// Entry arguments: |
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// rax: Interface |
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// j_rarg0: Receiver |
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// Free registers (non-args) are rax (interface), rbx |
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// get receiver (need to skip return address on top of stack) |
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assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); |
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// get receiver klass (also an implicit null-check) |
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address npe_addr = __ pc(); |
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// Most registers are in use; we'll use rax, rbx, r10, r11 |
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// (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them) |
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__ load_klass(r10, j_rarg0); |
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// If we take a trap while this arg is on the stack we will not |
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// be able to walk the stack properly. This is not an issue except |
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// when there are mistakes in this assembly code that could generate |
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// a spurious fault. Ask me how I know... |
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const Register method = rbx; |
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Label throw_icce; |
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// Get Method* and entrypoint for compiler |
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__ lookup_interface_method(// inputs: rec. class, interface, itable index |
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r10, rax, itable_index, |
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// outputs: method, scan temp. reg |
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method, r11, |
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throw_icce); |
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// method (rbx): Method* |
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// j_rarg0: receiver |
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#ifdef ASSERT |
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if (DebugVtables) { |
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Label L2; |
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__ cmpptr(method, (int32_t)NULL_WORD); |
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__ jcc(Assembler::equal, L2); |
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__ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
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__ jcc(Assembler::notZero, L2); |
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__ stop("compiler entrypoint is null"); |
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__ bind(L2); |
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} |
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#endif // ASSERT |
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// rbx: Method* |
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// j_rarg0: receiver |
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address ame_addr = __ pc(); |
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__ jmp(Address(method, Method::from_compiled_offset())); |
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__ bind(throw_icce); |
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__ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
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__ flush(); |
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if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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itable_index, s->entry_point(), |
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(int)(s->code_end() - s->entry_point()), |
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(int)(s->code_end() - __ pc())); |
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} |
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guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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// shut the door on sizing bugs |
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int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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s->set_exception_points(npe_addr, ame_addr); |
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return s; |
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} |
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int VtableStub::pd_code_size_limit(bool is_vtable_stub) { |
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if (is_vtable_stub) { |
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// Vtable stub size |
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return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) + |
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(UseCompressedKlassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
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} else { |
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// Itable stub size |
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return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) + |
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(UseCompressedKlassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
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} |
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// In order to tune these parameters, run the JVM with VM options |
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// +PrintMiscellaneous and +WizardMode to see information about |
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// actual itable stubs. Look for lines like this: |
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// itable #1 at 0x5551212[71] left over: 3 |
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// Reduce the constants so that the "left over" number is >=3 |
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// for the common cases. |
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// Do not aim at a left-over number of zero, because a |
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// large vtable or itable index (>= 32) will require a 32-bit |
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// immediate displacement instead of an 8-bit one. |
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// |
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// The JVM98 app. _202_jess has a megamorphic interface call. |
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// The itable code looks like this: |
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// Decoding VtableStub itbl[1]@12 |
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// mov 0x8(%rsi),%r10 |
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// mov 0x198(%r10),%r11d |
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// lea 0x218(%r10,%r11,8),%r11 |
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// lea 0x8(%r10),%r10 |
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// mov (%r11),%rbx |
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// cmp %rbx,%rax |
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// je success |
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// loop: |
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// test %rbx,%rbx |
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// je throw_icce |
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// add $0x10,%r11 |
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// mov (%r11),%rbx |
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// cmp %rbx,%rax |
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// jne loop |
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// success: |
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// mov 0x8(%r11),%r11d |
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// mov (%r10,%r11,1),%rbx |
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// jmpq *0x60(%rbx) |
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// throw_icce: |
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// jmpq throw_ICCE_entry |
1 | 253 |
} |
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int VtableStub::pd_code_alignment() { |
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return wordSize; |
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} |