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package org.graalvm.compiler.lir.aarch64;

import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.STACK;
import static jdk.vm.ci.code.ValueUtil.asStackSlot;
import static jdk.vm.ci.code.ValueUtil.isStackSlot;

import java.util.Arrays;

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

import jdk.vm.ci.code.Register;
import jdk.vm.ci.code.StackSlot;
import jdk.vm.ci.meta.AllocatableValue;

Restores registers from stack slots.
/** * Restores registers from stack slots. */
@Opcode("RESTORE_REGISTER") public class AArch64RestoreRegistersOp extends AArch64LIRInstruction { public static final LIRInstructionClass<AArch64RestoreRegistersOp> TYPE = LIRInstructionClass.create(AArch64RestoreRegistersOp.class);
The slots from which the registers are restored.
/** * The slots from which the registers are restored. */
@Use(STACK) protected final AllocatableValue[] slots;
The operation that saved the registers restored by this operation.
/** * The operation that saved the registers restored by this operation. */
private final AArch64SaveRegistersOp save; public AArch64RestoreRegistersOp(AllocatableValue[] values, AArch64SaveRegistersOp save) { this(TYPE, values, save); } protected AArch64RestoreRegistersOp(LIRInstructionClass<? extends AArch64RestoreRegistersOp> c, AllocatableValue[] values, AArch64SaveRegistersOp save) { super(c); assert Arrays.asList(values).stream().allMatch(LIRValueUtil::isVirtualStackSlot); this.slots = values; this.save = save; } protected Register[] getSavedRegisters() { return save.savedRegisters; } protected void restoreRegister(CompilationResultBuilder crb, AArch64MacroAssembler masm, Register result, StackSlot input) { AArch64Move.stack2reg(crb, masm, result.asValue(), input); } @Override public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) { Register[] savedRegisters = getSavedRegisters(); for (int i = 0; i < savedRegisters.length; i++) { if (savedRegisters[i] != null) { assert isStackSlot(slots[i]) : "not a StackSlot: " + slots[i]; restoreRegister(crb, masm, savedRegisters[i], asStackSlot(slots[i])); } } } }