duke@435: /*
xdono@631:  * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: #include "incls/_precompiled.incl"
duke@435: #include "incls/_vtableStubs_sparc.cpp.incl"
duke@435: 
duke@435: // machine-dependent part of VtableStubs: create vtableStub of correct size and
duke@435: // initialize its code
duke@435: 
duke@435: #define __ masm->
duke@435: 
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
duke@435: #endif
duke@435: 
duke@435: 
duke@435: // Used by compiler only; may use only caller saved, non-argument registers
duke@435: // NOTE:  %%%% if any change is made to this stub make sure that the function
duke@435: //             pd_code_size_limit is changed to ensure the correct size for VtableStub
duke@435: VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
duke@435:   const int sparc_code_length = VtableStub::pd_code_size_limit(true);
duke@435:   VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), sparc_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (CountCompiledCalls) {
duke@435:     Address ctr(G5, SharedRuntime::nof_megamorphic_calls_addr());
duke@435:     __ sethi(ctr);
duke@435:     __ ld(ctr, G3_scratch);
duke@435:     __ inc(G3_scratch);
duke@435:     __ st(G3_scratch, ctr);
duke@435:   }
duke@435: #endif /* PRODUCT */
duke@435: 
duke@435:   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
duke@435: 
duke@435:   // get receiver klass
duke@435:   address npe_addr = __ pc();
coleenp@548:   __ load_klass(O0, G3_scratch);
duke@435: 
duke@435:   // set methodOop (in case of interpreted method), and destination address
duke@435:   int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
duke@435: #ifndef PRODUCT
duke@435:   if (DebugVtables) {
duke@435:     Label L;
duke@435:     // check offset vs vtable length
duke@435:     __ ld(G3_scratch, instanceKlass::vtable_length_offset()*wordSize, G5);
duke@435:     __ cmp(G5, vtable_index*vtableEntry::size());
duke@435:     __ br(Assembler::greaterUnsigned, false, Assembler::pt, L);
duke@435:     __ delayed()->nop();
duke@435:     __ set(vtable_index, O2);
duke@435:     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
duke@435:     __ bind(L);
duke@435:   }
duke@435: #endif
duke@435:   int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
duke@435:   if( __ is_simm13(v_off) ) {
duke@435:     __ ld_ptr(G3, v_off, G5_method);
duke@435:   } else {
duke@435:     __ set(v_off,G5);
duke@435:     __ ld_ptr(G3, G5, G5_method);
duke@435:   }
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (DebugVtables) {
duke@435:     Label L;
duke@435:     __ br_notnull(G5_method, false, Assembler::pt, L);
duke@435:     __ delayed()->nop();
duke@435:     __ stop("Vtable entry is ZERO");
duke@435:     __ bind(L);
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   address ame_addr = __ pc();  // if the vtable entry is null, the method is abstract
duke@435:                                // NOTE: for vtable dispatches, the vtable entry will never be null.
duke@435: 
duke@435:   __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
duke@435: 
duke@435:   // jump to target (either compiled code or c2iadapter)
duke@435:   __ JMP(G3_scratch, 0);
duke@435:   // load methodOop (in case we call c2iadapter)
duke@435:   __ delayed()->nop();
duke@435: 
duke@435:   masm->flush();
duke@435:   s->set_exception_points(npe_addr, ame_addr);
duke@435:   return s;
duke@435: }
duke@435: 
duke@435: 
duke@435: // NOTE:  %%%% if any change is made to this stub make sure that the function
duke@435: //             pd_code_size_limit is changed to ensure the correct size for VtableStub
duke@435: VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
duke@435:   const int sparc_code_length = VtableStub::pd_code_size_limit(false);
duke@435:   VtableStub* s = new(sparc_code_length) VtableStub(false, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), sparc_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435:   Register G3_klassOop = G3_scratch;
duke@435:   Register G5_interface = G5;  // Passed in as an argument
duke@435:   Label search;
duke@435: 
duke@435:   // Entry arguments:
duke@435:   //  G5_interface: Interface
duke@435:   //  O0:           Receiver
duke@435:   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
duke@435: 
duke@435:   // get receiver klass (also an implicit null-check)
duke@435:   address npe_addr = __ pc();
coleenp@548:   __ load_klass(O0, G3_klassOop);
duke@435:   __ verify_oop(G3_klassOop);
duke@435: 
duke@435:   // Push a new window to get some temp registers.  This chops the head of all
duke@435:   // my 64-bit %o registers in the LION build, but this is OK because no longs
duke@435:   // are passed in the %o registers.  Instead, longs are passed in G1 and G4
duke@435:   // and so those registers are not available here.
duke@435:   __ save(SP,-frame::register_save_words*wordSize,SP);
duke@435:   Register I0_receiver = I0;    // Location of receiver after save
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (CountCompiledCalls) {
duke@435:     Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr());
duke@435:     __ sethi(ctr);
duke@435:     __ ld(ctr, L1);
duke@435:     __ inc(L1);
duke@435:     __ st(L1, ctr);
duke@435:   }
duke@435: #endif /* PRODUCT */
duke@435: 
duke@435:   // load start of itable entries into L0 register
duke@435:   const int base = instanceKlass::vtable_start_offset() * wordSize;
duke@435:   __ ld(Address(G3_klassOop, 0, instanceKlass::vtable_length_offset() * wordSize), L0);
duke@435: 
duke@435:   // %%% Could store the aligned, prescaled offset in the klassoop.
duke@435:   __ sll(L0, exact_log2(vtableEntry::size() * wordSize), L0);
duke@435:   // see code for instanceKlass::start_of_itable!
duke@435:   const int vtable_alignment = align_object_offset(1);
duke@435:   assert(vtable_alignment == 1 || vtable_alignment == 2, "");
duke@435:   const int odd_bit = vtableEntry::size() * wordSize;
duke@435:   if (vtable_alignment == 2) {
duke@435:     __ and3(L0, odd_bit, L1);   // isolate the odd bit
duke@435:   }
duke@435:   __ add(G3_klassOop, L0, L0);
duke@435:   if (vtable_alignment == 2) {
duke@435:     __ add(L0, L1, L0);         // double the odd bit, to align up
duke@435:   }
duke@435: 
duke@435:   // Loop over all itable entries until desired interfaceOop (G5_interface) found
duke@435:   __ bind(search);
duke@435: 
duke@435:   // %%%% Could load both offset and interface in one ldx, if they were
duke@435:   // in the opposite order.  This would save a load.
duke@435:   __ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1);
duke@435: 
dcubed@451:   // If the entry is NULL then we've reached the end of the table
dcubed@451:   // without finding the expected interface, so throw an exception
dcubed@451:   Label throw_icce;
dcubed@451:   __ bpr(Assembler::rc_z, false, Assembler::pn, L1, throw_icce);
dcubed@451:   __ delayed()->cmp(G5_interface, L1);
duke@435:   __ brx(Assembler::notEqual, true, Assembler::pn, search);
duke@435:   __ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0);
duke@435: 
duke@435:   // entry found and L0 points to it, move offset of vtable for interface into L0
duke@435:   __ ld(L0, base + itableOffsetEntry::offset_offset_in_bytes(), L0);
duke@435: 
duke@435:   // Compute itableMethodEntry and get methodOop(G5_method) and entrypoint(L0) for compiler
duke@435:   const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
duke@435:   __ add(G3_klassOop, L0, L1);
duke@435:   __ ld_ptr(L1, method_offset, G5_method);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (DebugVtables) {
duke@435:     Label L01;
duke@435:     __ ld_ptr(L1, method_offset, G5_method);
duke@435:     __ bpr(Assembler::rc_nz, false, Assembler::pt, G5_method, L01);
duke@435:     __ delayed()->nop();
duke@435:     __ stop("methodOop is null");
duke@435:     __ bind(L01);
duke@435:     __ verify_oop(G5_method);
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   // If the following load is through a NULL pointer, we'll take an OS
duke@435:   // exception that should translate into an AbstractMethodError.  We need the
duke@435:   // window count to be correct at that time.
duke@435:   __ restore();                 // Restore registers BEFORE the AME point
duke@435: 
duke@435:   address ame_addr = __ pc();   // if the vtable entry is null, the method is abstract
duke@435:   __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
duke@435: 
duke@435:   // G5_method:  methodOop
duke@435:   // O0:         Receiver
duke@435:   // G3_scratch: entry point
duke@435:   __ JMP(G3_scratch, 0);
duke@435:   __ delayed()->nop();
duke@435: 
dcubed@451:   __ bind(throw_icce);
dcubed@451:   Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry());
dcubed@451:   __ jump_to(icce, 0);
dcubed@451:   __ delayed()->restore();
dcubed@451: 
duke@435:   masm->flush();
dcubed@451: 
dcubed@451:   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
dcubed@451: 
duke@435:   s->set_exception_points(npe_addr, ame_addr);
duke@435:   return s;
duke@435: }
duke@435: 
duke@435: 
duke@435: int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
dcubed@451:   if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
duke@435:   else {
duke@435:     const int slop = 2*BytesPerInstWord; // sethi;add  (needed for long offsets)
duke@435:     if (is_vtable_stub) {
coleenp@548:       // ld;ld;ld,jmp,nop
coleenp@548:       const int basic = 5*BytesPerInstWord +
coleenp@548:                         // shift;add for load_klass
coleenp@548:                         (UseCompressedOops ? 2*BytesPerInstWord : 0);
duke@435:       return basic + slop;
duke@435:     } else {
dcubed@451:       // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore, sethi, jmpl, restore
coleenp@548:       const int basic = (20 LP64_ONLY(+ 6)) * BytesPerInstWord +
coleenp@548:                         // shift;add for load_klass
coleenp@548:                         (UseCompressedOops ? 2*BytesPerInstWord : 0);
duke@435:       return (basic + slop);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: int VtableStub::pd_code_alignment() {
duke@435:   // UltraSPARC cache line size is 8 instructions:
duke@435:   const unsigned int icache_line_size = 32;
duke@435:   return icache_line_size;
duke@435: }