AArch64CCall.java

/*
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 * 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.
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package org.graalvm.compiler.lir.aarch64;

import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;

import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.ValueUtil;
import jdk.vm.ci.meta.Value;

public final class AArch64CCall extends AArch64LIRInstruction {
    public static final LIRInstructionClass<AArch64CCall> TYPE = LIRInstructionClass.create(AArch64CCall.class);

    @Def({REG, ILLEGAL}) protected Value result;
    @Use({REG, STACK}) protected Value[] parameters;
    @Use({REG}) protected Value functionPtr;

    public AArch64CCall(Value result, Value functionPtr, Value[] parameters) {
        super(TYPE);
        this.result = result;
        this.functionPtr = functionPtr;
        this.parameters = parameters;
    }

    @Override
    public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
        directCall(masm);
    }

    private void directCall(AArch64MacroAssembler masm) {
        Register reg = ValueUtil.asRegister(functionPtr);
        masm.blr(reg);
        masm.ensureUniquePC();
    }

    @Override
    public boolean destroysCallerSavedRegisters() {
        return true;
    }

}