294 lines
10 KiB
C++
294 lines
10 KiB
C++
/*
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* Copyright (c) 1997, 2013, 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.inline.hpp"
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#include "code/vtableStubs.hpp"
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#include "interp_masm_sparc.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_sparc.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, oopDesc* receiver, int index);
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#endif
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// Used by compiler only; may use only caller saved, non-argument registers
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// NOTE: %%%% if any change is made to this stub make sure that the function
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// pd_code_size_limit is changed to ensure the correct size for VtableStub
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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const int sparc_code_length = VtableStub::pd_code_size_limit(true);
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VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
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// Can be NULL if there is no free space in the code cache.
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if (s == NULL) {
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return NULL;
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}
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), sparc_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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__ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch);
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}
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#endif /* PRODUCT */
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assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
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// get receiver klass
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address npe_addr = __ pc();
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__ load_klass(O0, G3_scratch);
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// set Method* (in case of interpreted method), and destination address
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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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__ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5);
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__ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L);
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__ set(vtable_index, O2);
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__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
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__ bind(L);
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}
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#endif
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__ lookup_virtual_method(G3_scratch, vtable_index, G5_method);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L;
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__ br_notnull_short(G5_method, Assembler::pt, L);
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__ stop("Vtable entry is ZERO");
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__ bind(L);
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}
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#endif
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address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
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// NOTE: for vtable dispatches, the vtable entry will never be null.
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__ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
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// jump to target (either compiled code or c2iadapter)
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__ JMP(G3_scratch, 0);
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// load Method* (in case we call c2iadapter)
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__ delayed()->nop();
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masm->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, p2i(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 = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
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assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
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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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// NOTE: %%%% if any change is made to this stub make sure that the function
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// pd_code_size_limit is changed to ensure the correct size for VtableStub
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VtableStub* VtableStubs::create_itable_stub(int itable_index) {
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const int sparc_code_length = VtableStub::pd_code_size_limit(false);
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VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index);
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// Can be NULL if there is no free space in the code cache.
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if (s == NULL) {
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return NULL;
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}
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), sparc_code_length);
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MacroAssembler* masm = new MacroAssembler(&cb);
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Register G3_Klass = G3_scratch;
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Register G5_interface = G5; // Passed in as an argument
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Label search;
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// Entry arguments:
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// G5_interface: Interface
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// O0: Receiver
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assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
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// get receiver klass (also an implicit null-check)
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address npe_addr = __ pc();
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__ load_klass(O0, G3_Klass);
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// Push a new window to get some temp registers. This chops the head of all
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// my 64-bit %o registers in the LION build, but this is OK because no longs
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// are passed in the %o registers. Instead, longs are passed in G1 and G4
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// and so those registers are not available here.
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__ save(SP,-frame::register_save_words*wordSize,SP);
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#ifndef PRODUCT
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if (CountCompiledCalls) {
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__ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1);
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}
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#endif /* PRODUCT */
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Label throw_icce;
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Register L5_method = L5;
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__ lookup_interface_method(// inputs: rec. class, interface, itable index
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G3_Klass, G5_interface, itable_index,
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// outputs: method, scan temp. reg
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L5_method, L2, L3,
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throw_icce);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L01;
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__ br_notnull_short(L5_method, Assembler::pt, L01);
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__ stop("Method* is null");
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__ bind(L01);
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}
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#endif
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// If the following load is through a NULL pointer, we'll take an OS
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// exception that should translate into an AbstractMethodError. We need the
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// window count to be correct at that time.
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__ restore(L5_method, 0, G5_method);
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// Restore registers *before* the AME point.
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address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
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__ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
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// G5_method: Method*
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// O0: Receiver
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// G3_scratch: entry point
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__ JMP(G3_scratch, 0);
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__ delayed()->nop();
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__ bind(throw_icce);
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AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
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__ jump_to(icce, G3_scratch);
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__ delayed()->restore();
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masm->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, p2i(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 = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
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assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
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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 (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
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else {
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const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
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if (is_vtable_stub) {
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// ld;ld;ld,jmp,nop
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const int basic = 5*BytesPerInstWord +
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// shift;add for load_klass (only shift with zero heap based)
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(UseCompressedClassPointers ?
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MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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return basic + slop;
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} else {
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const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord +
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// shift;add for load_klass (only shift with zero heap based)
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(UseCompressedClassPointers ?
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MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
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return (basic + slop);
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}
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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[116] left over: 8
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// Reduce the constants so that the "left over" number is 8
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// Do not aim at a left-over number of zero, because a very
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// large vtable or itable offset (> 4K) will require an extra
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// sethi/or pair of instructions.
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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]@16
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// ld [ %o0 + 4 ], %g3
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// save %sp, -64, %sp
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// ld [ %g3 + 0xe8 ], %l2
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// sll %l2, 2, %l2
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// add %l2, 0x134, %l2
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// and %l2, -8, %l2 ! NOT_LP64 only
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// add %g3, %l2, %l2
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// add %g3, 4, %g3
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// ld [ %l2 ], %l5
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// brz,pn %l5, throw_icce
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// cmp %l5, %g5
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// be %icc, success
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// add %l2, 8, %l2
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// loop:
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// ld [ %l2 ], %l5
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// brz,pn %l5, throw_icce
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// cmp %l5, %g5
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// bne,pn %icc, loop
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// add %l2, 8, %l2
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// success:
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// ld [ %l2 + -4 ], %l2
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// ld [ %g3 + %l2 ], %l5
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// restore %l5, 0, %g5
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// ld [ %g5 + 0x44 ], %g3
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// jmp %g3
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// nop
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// throw_icce:
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// sethi %hi(throw_ICCE_entry), %g3
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// ! 5 more instructions here, LP64_ONLY
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// jmp %g3 + %lo(throw_ICCE_entry)
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// restore
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}
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int VtableStub::pd_code_alignment() {
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// UltraSPARC cache line size is 8 instructions:
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const unsigned int icache_line_size = 32;
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return icache_line_size;
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}
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