author | twisti |
Fri, 13 Feb 2009 09:09:35 -0800 | |
changeset 2031 | 24e034f56dcb |
parent 670 | ddf3e9583f2f |
child 2149 | 3d362637b307 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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#include "incls/_precompiled.incl" |
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#include "incls/_vtableStubs_sparc.cpp.incl" |
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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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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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Address ctr(G5, SharedRuntime::nof_megamorphic_calls_addr()); |
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__ sethi(ctr); |
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__ ld(ctr, G3_scratch); |
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__ inc(G3_scratch); |
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__ st(G3_scratch, ctr); |
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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 methodOop (in case of interpreted method), and destination address |
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int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size(); |
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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(G5, vtable_index*vtableEntry::size()); |
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__ br(Assembler::greaterUnsigned, false, Assembler::pt, L); |
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__ delayed()->nop(); |
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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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int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes(); |
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if( __ is_simm13(v_off) ) { |
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__ ld_ptr(G3, v_off, G5_method); |
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} else { |
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__ set(v_off,G5); |
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__ ld_ptr(G3, G5, G5_method); |
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} |
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#ifndef PRODUCT |
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if (DebugVtables) { |
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Label L; |
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__ br_notnull(G5_method, false, Assembler::pt, L); |
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__ delayed()->nop(); |
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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(methodOopDesc::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 methodOop (in case we call c2iadapter) |
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__ delayed()->nop(); |
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masm->flush(); |
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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 vtable_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, vtable_index); |
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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_klassOop = 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_klassOop); |
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__ verify_oop(G3_klassOop); |
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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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Register I0_receiver = I0; // Location of receiver after save |
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#ifndef PRODUCT |
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if (CountCompiledCalls) { |
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Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr()); |
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__ sethi(ctr); |
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__ ld(ctr, L1); |
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__ inc(L1); |
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__ st(L1, ctr); |
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} |
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#endif /* PRODUCT */ |
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// load start of itable entries into L0 register |
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const int base = instanceKlass::vtable_start_offset() * wordSize; |
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__ ld(Address(G3_klassOop, 0, instanceKlass::vtable_length_offset() * wordSize), L0); |
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// %%% Could store the aligned, prescaled offset in the klassoop. |
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__ sll(L0, exact_log2(vtableEntry::size() * wordSize), L0); |
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// see code for instanceKlass::start_of_itable! |
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const int vtable_alignment = align_object_offset(1); |
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assert(vtable_alignment == 1 || vtable_alignment == 2, ""); |
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const int odd_bit = vtableEntry::size() * wordSize; |
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if (vtable_alignment == 2) { |
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__ and3(L0, odd_bit, L1); // isolate the odd bit |
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} |
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__ add(G3_klassOop, L0, L0); |
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if (vtable_alignment == 2) { |
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__ add(L0, L1, L0); // double the odd bit, to align up |
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} |
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// Loop over all itable entries until desired interfaceOop (G5_interface) found |
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__ bind(search); |
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// %%%% Could load both offset and interface in one ldx, if they were |
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// in the opposite order. This would save a load. |
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__ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1); |
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// If the entry is NULL then we've reached the end of the table |
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// without finding the expected interface, so throw an exception |
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Label throw_icce; |
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__ bpr(Assembler::rc_z, false, Assembler::pn, L1, throw_icce); |
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__ delayed()->cmp(G5_interface, L1); |
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__ brx(Assembler::notEqual, true, Assembler::pn, search); |
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__ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0); |
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// entry found and L0 points to it, move offset of vtable for interface into L0 |
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__ ld(L0, base + itableOffsetEntry::offset_offset_in_bytes(), L0); |
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// Compute itableMethodEntry and get methodOop(G5_method) and entrypoint(L0) for compiler |
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const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes(); |
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__ add(G3_klassOop, L0, L1); |
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__ ld_ptr(L1, method_offset, G5_method); |
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#ifndef PRODUCT |
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if (DebugVtables) { |
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Label L01; |
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__ ld_ptr(L1, method_offset, G5_method); |
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__ bpr(Assembler::rc_nz, false, Assembler::pt, G5_method, L01); |
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__ delayed()->nop(); |
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__ stop("methodOop is null"); |
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__ bind(L01); |
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__ verify_oop(G5_method); |
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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(); // 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(methodOopDesc::from_compiled_offset()), G3_scratch); |
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// G5_method: methodOop |
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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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Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry()); |
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__ jump_to(icce, 0); |
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__ delayed()->restore(); |
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masm->flush(); |
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guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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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 |
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(UseCompressedOops ? 2*BytesPerInstWord : 0); |
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return basic + slop; |
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} else { |
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// save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore, sethi, jmpl, restore |
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const int basic = (20 LP64_ONLY(+ 6)) * BytesPerInstWord + |
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// shift;add for load_klass |
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(UseCompressedOops ? 2*BytesPerInstWord : 0); |
1 | 250 |
return (basic + slop); |
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} |
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} |
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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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} |