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/*
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* Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.asm;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.function.Consumer;
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import jdk.vm.ci.code.Register;
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import jdk.vm.ci.code.StackSlot;
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import jdk.vm.ci.code.TargetDescription;
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/**
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* The platform-independent base class for the assembler.
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*/
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public abstract class Assembler {
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public abstract static class CodeAnnotation {
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/**
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* The position (bytes from the beginning of the method) of the annotated instruction.
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*/
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public final int instructionPosition;
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protected CodeAnnotation(int instructionStartPosition) {
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this.instructionPosition = instructionStartPosition;
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}
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}
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public final TargetDescription target;
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private List<LabelHint> jumpDisplacementHints;
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/**
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* Backing code buffer.
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*/
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private final Buffer codeBuffer;
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protected Consumer<CodeAnnotation> codePatchingAnnotationConsumer;
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public Assembler(TargetDescription target) {
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this.target = target;
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this.codeBuffer = new Buffer(target.arch.getByteOrder());
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}
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public void setCodePatchingAnnotationConsumer(Consumer<CodeAnnotation> codeAnnotationConsumer) {
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assert this.codePatchingAnnotationConsumer == null : "overwriting existing value";
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this.codePatchingAnnotationConsumer = codeAnnotationConsumer;
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}
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/**
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* Returns the current position of the underlying code buffer.
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*
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* @return current position in code buffer
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*/
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public int position() {
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return codeBuffer.position();
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}
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public final void emitByte(int x) {
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codeBuffer.emitByte(x);
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}
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public final void emitShort(int x) {
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codeBuffer.emitShort(x);
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}
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public final void emitInt(int x) {
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codeBuffer.emitInt(x);
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}
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public final void emitLong(long x) {
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codeBuffer.emitLong(x);
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}
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public final void emitByte(int b, int pos) {
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codeBuffer.emitByte(b, pos);
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}
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public final void emitShort(int b, int pos) {
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codeBuffer.emitShort(b, pos);
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}
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public final void emitInt(int b, int pos) {
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codeBuffer.emitInt(b, pos);
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}
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public final void emitLong(long b, int pos) {
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codeBuffer.emitLong(b, pos);
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}
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public final int getByte(int pos) {
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return codeBuffer.getByte(pos);
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}
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public final int getShort(int pos) {
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return codeBuffer.getShort(pos);
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}
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public final int getInt(int pos) {
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return codeBuffer.getInt(pos);
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}
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private static final String NEWLINE = System.lineSeparator();
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/**
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* Some GPU architectures have a text based encoding.
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*/
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public final void emitString(String x) {
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emitString0("\t"); // XXX REMOVE ME pretty-printing
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emitString0(x);
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emitString0(NEWLINE);
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}
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// XXX for pretty-printing
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public final void emitString0(String x) {
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codeBuffer.emitBytes(x.getBytes(), 0, x.length());
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}
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public void emitString(String s, int pos) {
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codeBuffer.emitBytes(s.getBytes(), pos);
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}
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/**
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* Closes this assembler. No extra data can be written to this assembler after this call.
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*
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* @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not
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* including) {@code position()} is returned
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* @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
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*/
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public byte[] close(boolean trimmedCopy) {
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return codeBuffer.close(trimmedCopy);
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}
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public void bind(Label l) {
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assert !l.isBound() : "can bind label only once";
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l.bind(position());
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l.patchInstructions(this);
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}
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public abstract void align(int modulus);
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public abstract void jmp(Label l);
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protected abstract void patchJumpTarget(int branch, int jumpTarget);
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private Map<Label, String> nameMap;
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/**
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* Creates a name for a label.
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*
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* @param l the label for which a name is being created
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* @param id a label identifier that is unique with the scope of this assembler
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* @return a label name in the form of "L123"
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*/
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protected String createLabelName(Label l, int id) {
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return "L" + id;
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}
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/**
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* Gets a name for a label, creating it if it does not yet exist. By default, the returned name
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* is only unique with the scope of this assembler.
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*/
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public String nameOf(Label l) {
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if (nameMap == null) {
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nameMap = new HashMap<>();
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}
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String name = nameMap.get(l);
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if (name == null) {
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name = createLabelName(l, nameMap.size());
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nameMap.put(l, name);
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}
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return name;
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}
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/**
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* This is used by the CompilationResultBuilder to convert a {@link StackSlot} to an
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* {@link AbstractAddress}.
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*/
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public abstract AbstractAddress makeAddress(Register base, int displacement);
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/**
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* Returns a target specific placeholder address that can be used for code patching.
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*
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* @param instructionStartPosition The start of the instruction, i.e., the value that is used as
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* the key for looking up placeholder patching information.
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*/
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public abstract AbstractAddress getPlaceholder(int instructionStartPosition);
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/**
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* Emits a NOP instruction to advance the current PC.
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*/
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public abstract void ensureUniquePC();
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public void reset() {
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codeBuffer.reset();
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captureLabelPositions();
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}
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private void captureLabelPositions() {
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if (jumpDisplacementHints == null) {
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return;
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}
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for (LabelHint request : this.jumpDisplacementHints) {
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request.capture();
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}
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}
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public LabelHint requestLabelHint(Label label) {
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if (jumpDisplacementHints == null) {
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jumpDisplacementHints = new ArrayList<>();
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}
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LabelHint hint = new LabelHint(label, position());
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this.jumpDisplacementHints.add(hint);
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return hint;
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}
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public InstructionCounter getInstructionCounter() {
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throw new UnsupportedOperationException("Instruction counter is not implemented for " + this);
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}
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public static class LabelHint {
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private Label label;
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private int forPosition;
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private int capturedTarget = -1;
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protected LabelHint(Label label, int lastPosition) {
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super();
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this.label = label;
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this.forPosition = lastPosition;
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}
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protected void capture() {
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this.capturedTarget = label.position();
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}
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public int getTarget() {
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assert isValid();
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return capturedTarget;
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}
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public int getPosition() {
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assert isValid();
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return forPosition;
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}
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public boolean isValid() {
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return capturedTarget >= 0;
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}
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}
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/**
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* Instruction counter class which gives the user of the assembler to count different kinds of
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* instructions in the generated assembler code.
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*/
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public interface InstructionCounter {
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String[] getSupportedInstructionTypes();
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int[] countInstructions(String[] instructionTypes, int beginPc, int endPc);
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}
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}
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