299 lines
9.8 KiB
Java
299 lines
9.8 KiB
Java
/*
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* Copyright (c) 2002, 2013, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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 com.sun.tools.javac.jvm;
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import java.util.*;
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import com.sun.tools.javac.code.Flags;
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import com.sun.tools.javac.code.Symbol;
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import com.sun.tools.javac.util.*;
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import static com.sun.tools.javac.main.Option.TARGET;
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/** The classfile version target.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public enum Target {
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JDK1_1("1.1", 45, 3),
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JDK1_2("1.2", 46, 0),
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JDK1_3("1.3", 47, 0),
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/** J2SE1.4 = Merlin. */
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JDK1_4("1.4", 48, 0),
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/** Tiger. */
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JDK1_5("1.5", 49, 0),
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/** JDK 6. */
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JDK1_6("1.6", 50, 0),
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/** JDK 7. */
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JDK1_7("1.7", 51, 0),
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/** JDK 8. */
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JDK1_8("1.8", 52, 0);
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private static final Context.Key<Target> targetKey =
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new Context.Key<Target>();
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public static Target instance(Context context) {
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Target instance = context.get(targetKey);
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if (instance == null) {
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Options options = Options.instance(context);
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String targetString = options.get(TARGET);
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if (targetString != null) instance = lookup(targetString);
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if (instance == null) instance = DEFAULT;
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context.put(targetKey, instance);
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}
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return instance;
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}
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private static final Target MIN = values()[0];
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public static Target MIN() { return MIN; }
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private static final Target MAX = values()[values().length - 1];
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public static Target MAX() { return MAX; }
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private static final Map<String,Target> tab = new HashMap<String,Target>();
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static {
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for (Target t : values()) {
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tab.put(t.name, t);
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}
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tab.put("5", JDK1_5);
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tab.put("6", JDK1_6);
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tab.put("7", JDK1_7);
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tab.put("8", JDK1_8);
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}
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public final String name;
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public final int majorVersion;
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public final int minorVersion;
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private Target(String name, int majorVersion, int minorVersion) {
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this.name = name;
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this.majorVersion = majorVersion;
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this.minorVersion = minorVersion;
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}
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public static final Target DEFAULT = JDK1_8;
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public static Target lookup(String name) {
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return tab.get(name);
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}
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/** In -target 1.1 and earlier, the compiler is required to emit
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* synthetic method definitions in abstract classes for interface
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* methods that are not overridden. We call them "Miranda" methods.
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*/
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public boolean requiresIproxy() {
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return compareTo(JDK1_1) <= 0;
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}
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/** Beginning in 1.4, we take advantage of the possibility of emitting
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* code to initialize fields before calling the superclass constructor.
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* This is allowed by the VM spec, but the verifier refused to allow
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* it until 1.4. This is necesary to translate some code involving
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* inner classes. See, for example, 4030374.
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*/
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public boolean initializeFieldsBeforeSuper() {
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return compareTo(JDK1_4) >= 0;
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}
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/** Beginning with -target 1.2 we obey the JLS rules for binary
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* compatibility, emitting as the qualifying type of a reference
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* to a method or field the type of the qualifier. In earlier
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* targets we use as the qualifying type the class in which the
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* member was found. The following methods named
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* *binaryCompatibility() indicate places where we vary from this
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* general rule. */
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public boolean obeyBinaryCompatibility() {
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return compareTo(JDK1_2) >= 0;
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}
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/** Starting in 1.5, the compiler uses an array type as
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* the qualifier for method calls (such as clone) where required by
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* the language and VM spec. Earlier versions of the compiler
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* qualified them by Object.
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*/
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public boolean arrayBinaryCompatibility() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Beginning after 1.2, we follow the binary compatibility rules for
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* interface fields. The 1.2 VMs had bugs handling interface fields
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* when compiled using binary compatibility (see 4400598), so this is
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* an accommodation to them.
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*/
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public boolean interfaceFieldsBinaryCompatibility() {
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return compareTo(JDK1_2) > 0;
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}
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/** Beginning in -target 1.5, we follow the binary compatibility
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* rules for interface methods that redefine Object methods.
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* Earlier VMs had bugs handling such methods compiled using binary
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* compatibility (see 4392595, 4398791, 4392595, 4400415).
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* The VMs were fixed during or soon after 1.4. See 4392595.
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*/
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public boolean interfaceObjectOverridesBinaryCompatibility() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Beginning in -target 1.5, we make synthetic variables
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* package-private instead of private. This is to prevent the
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* necessity of access methods, which effectively relax the
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* protection of the field but bloat the class files and affect
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* execution.
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*/
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public boolean usePrivateSyntheticFields() {
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return compareTo(JDK1_5) < 0;
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}
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/** Sometimes we need to create a field to cache a value like a
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* class literal of the assertions flag. In -target 1.5 and
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* later we create a new synthetic class for this instead of
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* using the outermost class. See 4401576.
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*/
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public boolean useInnerCacheClass() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Return true if cldc-style stack maps need to be generated. */
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public boolean generateCLDCStackmap() {
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return false;
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}
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/** Beginning in -target 6, we generate stackmap attribute in
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* compact format. */
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public boolean generateStackMapTable() {
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return compareTo(JDK1_6) >= 0;
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}
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/** Beginning in -target 6, package-info classes are marked synthetic.
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*/
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public boolean isPackageInfoSynthetic() {
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return compareTo(JDK1_6) >= 0;
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}
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/** Do we generate "empty" stackmap slots after double and long?
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*/
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public boolean generateEmptyAfterBig() {
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return false;
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}
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/** Beginning in 1.5, we have an unsynchronized version of
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* StringBuffer called StringBuilder that can be used by the
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* compiler for string concatenation.
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*/
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public boolean useStringBuilder() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Beginning in 1.5, we have flag bits we can use instead of
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* marker attributes.
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*/
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public boolean useSyntheticFlag() {
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return compareTo(JDK1_5) >= 0;
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}
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public boolean useEnumFlag() {
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return compareTo(JDK1_5) >= 0;
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}
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public boolean useAnnotationFlag() {
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return compareTo(JDK1_5) >= 0;
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}
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public boolean useVarargsFlag() {
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return compareTo(JDK1_5) >= 0;
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}
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public boolean useBridgeFlag() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Return the character to be used in constructing synthetic
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* identifiers, where not specified by the JLS.
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*/
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public char syntheticNameChar() {
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return '$';
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}
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/** Does the VM have direct support for class literals?
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*/
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public boolean hasClassLiterals() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Does the VM support an invokedynamic instruction?
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*/
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public boolean hasInvokedynamic() {
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return compareTo(JDK1_7) >= 0;
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}
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/** Does the VM support polymorphic method handle invocation?
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* Affects the linkage information output to the classfile.
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* An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together.
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*/
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public boolean hasMethodHandles() {
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return hasInvokedynamic();
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}
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/** Although we may not have support for class literals, should we
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* avoid initializing the class that the literal refers to?
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* See 4468823
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*/
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public boolean classLiteralsNoInit() {
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return compareTo(JDK1_5) >= 0;
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}
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/** Although we may not have support for class literals, when we
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* throw a NoClassDefFoundError, should we initialize its cause?
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*/
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public boolean hasInitCause() {
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return compareTo(JDK1_4) >= 0;
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}
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/** For bootstrapping, we use J2SE1.4's wrapper class constructors
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* to implement boxing.
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*/
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public boolean boxWithConstructors() {
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return compareTo(JDK1_5) < 0;
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}
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/** For bootstrapping, we use J2SE1.4's java.util.Collection
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* instead of java.lang.Iterable.
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*/
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public boolean hasIterable() {
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return compareTo(JDK1_5) >= 0;
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}
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/** In J2SE1.5.0, we introduced the "EnclosingMethod" attribute
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* for improved reflection support.
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*/
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public boolean hasEnclosingMethodAttribute() {
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return compareTo(JDK1_5) >= 0;
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}
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}
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