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/*
* Copyright (c) 2009, 2012, 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
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*/
package org.graalvm.compiler.lir.sparc;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
import static jdk.vm.ci.code.ValueUtil.asRegister;
import org.graalvm.compiler.asm.sparc.SPARCAssembler;
import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
import org.graalvm.compiler.lir.LIR;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.StandardOp.NoOp;
import org.graalvm.compiler.lir.Variable;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
import jdk.vm.ci.code.Register;
import jdk.vm.ci.meta.AllocatableValue;
/**
* Loads the constant section base into a register.
*
* <p>
* Layout:
*
* <pre>
* +----constant section----+--pad--+---code section--+
* |<-------------------_------------------->|
* ^- Constant section base pointer
* </pre>
*
* The constant section base pointer is placed as such that the lowest offset -4096 points to the
* start of the constant section.
* <p>
* If the constant section grows beyond 8k size, the immediate addressing cannot be used anymore; in
* this case absolute addressing (without using the base pointer is used). See also:
* CodeInstaller::pd_patch_DataSectionReference
*
* @see SPARCMove#loadFromConstantTable(CompilationResultBuilder, SPARCMacroAssembler, int,
* Register, jdk.vm.ci.meta.Constant, Register, SPARCDelayedControlTransfer)
*/
public class SPARCLoadConstantTableBaseOp extends SPARCLIRInstruction {
public static final LIRInstructionClass<SPARCLoadConstantTableBaseOp> TYPE = LIRInstructionClass.create(SPARCLoadConstantTableBaseOp.class);
public static final SizeEstimate SIZE = SizeEstimate.create(9);
private final NoOp placeHolder;
@Def({REG}) private AllocatableValue base;
public SPARCLoadConstantTableBaseOp(Variable base, NoOp placeHolder) {
super(TYPE, SIZE);
this.base = base;
this.placeHolder = placeHolder;
}
@Override
public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) {
Register baseRegister = asRegister(base);
int beforePosition = masm.position();
masm.rdpc(baseRegister);
// Must match with CodeInstaller::pd_patch_DataSectionReference
masm.add(baseRegister, (int) SPARCAssembler.minSimm(13), baseRegister);
masm.sub(baseRegister, beforePosition, baseRegister);
}
public AllocatableValue getResult() {
return base;
}
public void setAlive(LIR lir, boolean alive) {
if (alive) {
placeHolder.replace(lir, this);
} else {
placeHolder.remove(lir);
}
}
}