/* * Copyright (c) 2018, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
class G1PreBarrierStub: public CodeStub { friendclass G1BarrierSetC1; private: bool _do_load;
LIR_Opr _addr;
LIR_Opr _pre_val;
LIR_PatchCode _patch_code;
CodeEmitInfo* _info;
public: // Version that _does_ generate a load of the previous value from addr. // addr (the address of the field to be read) must be a LIR_Address // pre_val (a temporary register) must be a register;
G1PreBarrierStub(LIR_Opr addr, LIR_Opr pre_val, LIR_PatchCode patch_code, CodeEmitInfo* info) :
_do_load(true), _addr(addr), _pre_val(pre_val),
_patch_code(patch_code), _info(info)
{
assert(_pre_val->is_register(), "should be temporary register");
assert(_addr->is_address(), "should be the address of the field");
}
// Version that _does not_ generate load of the previous value; the // previous value is assumed to have already been loaded into pre_val.
G1PreBarrierStub(LIR_Opr pre_val) :
_do_load(false), _addr(LIR_OprFact::illegalOpr), _pre_val(pre_val),
_patch_code(lir_patch_none), _info(NULL)
{
assert(_pre_val->is_register(), "should be a register");
}
virtualvoid emit_code(LIR_Assembler* e); virtualvoid visit(LIR_OpVisitState* visitor) { if (_do_load) { // don't pass in the code emit info since it's processed in the fast // path if (_info != NULL)
visitor->do_slow_case(_info); else
visitor->do_slow_case();
class G1PostBarrierStub: public CodeStub { friendclass G1BarrierSetC1; private:
LIR_Opr _addr;
LIR_Opr _new_val;
public: // addr (the address of the object head) and new_val must be registers.
G1PostBarrierStub(LIR_Opr addr, LIR_Opr new_val): _addr(addr), _new_val(new_val) { }
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