Mercurial > hg > truffle
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/StandardOp.java @ 9247:27c75e4016db
clarified code for emitting LIR code to save RBP
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Tue, 23 Apr 2013 14:03:32 +0200 |
parents | 1fa6536416db |
children | a5f2b9012865 0266549ff6e0 |
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/* * Copyright (c) 2011, 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.lir; import com.oracle.graal.api.meta.*; import com.oracle.graal.asm.*; import com.oracle.graal.graph.*; import com.oracle.graal.lir.asm.*; import com.oracle.graal.nodes.cfg.*; import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*; /** * A collection of machine-independent LIR operations, as well as interfaces to be implemented for * specific kinds or LIR operations. */ public class StandardOp { /** * Marker interface for LIR ops that can fall through to the next operation, like a switch * statement. setFallThroughTarget(null) can be used to make the operation fall through to the * next one. */ public interface FallThroughOp { LabelRef fallThroughTarget(); void setFallThroughTarget(LabelRef target); } /** * LIR operation that defines the position of a label. The first operation of every block must * implement this interface. */ public static class LabelOp extends LIRInstruction { private final Label label; private final boolean align; public LabelOp(Label label, boolean align) { this.label = label; this.align = align; } @Override public void emitCode(TargetMethodAssembler tasm) { if (align) { tasm.asm.align(tasm.target.wordSize * 2); } tasm.asm.bind(label); } public Label getLabel() { return label; } } /** * LIR operation that is an unconditional jump to {@link #destination()}. When the LIR is * constructed, the last operation of every block must implement this interface. After register * allocation, unnecessary jumps can be deleted. */ public static class JumpOp extends LIRInstruction { private final LabelRef destination; public JumpOp(LabelRef destination) { this.destination = destination; } @Override public void emitCode(TargetMethodAssembler tasm) { tasm.asm.jmp(destination.label()); } public LabelRef destination() { return destination; } } /** * Marker interface for a LIR operation that is a conditional jump to {@link #destination()}. * Conditional jumps may be negated or optimized away after register allocation. */ public interface BranchOp { LabelRef destination(); void negate(LabelRef newDestination); } /** * Marker interface for a LIR operation that moves a value from {@link #getInput()} to * {@link #getResult()}. */ public interface MoveOp { Value getInput(); Value getResult(); } /** * Meta-operation that defines the incoming method parameters. In the LIR, every register and * variable must be defined before it is used. This operation is the definition point of method * parameters, but is otherwise a no-op. In particular, it is not the actual method prologue. */ public static final class ParametersOp extends LIRInstruction { @Def({REG, STACK}) protected Value[] params; public ParametersOp(Value[] params) { this.params = params; } @Override public void emitCode(TargetMethodAssembler tasm) { // No code to emit. } } /** * Placeholder for a LIR instruction that will be subsequently replaced. */ public static class PlaceholderOp extends LIRInstruction { /** * The block in which this instruction is located. */ final Block block; /** * The block index of this instruction. */ final int index; public PlaceholderOp(Block block, int index) { this.block = block; this.index = index; } public void replace(LIR lir, LIRInstruction replacement) { lir.lir(block).set(index, replacement); } @Override public void emitCode(TargetMethodAssembler tasm) { throw new GraalInternalError(this + " should have been replaced"); } } }