duke@1: /*
ksrini@1395: * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
duke@1: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1: *
duke@1: * This code is free software; you can redistribute it and/or modify it
duke@1: * under the terms of the GNU General Public License version 2 only, as
ohair@554: * published by the Free Software Foundation. Oracle designates this
duke@1: * particular file as subject to the "Classpath" exception as provided
ohair@554: * by Oracle in the LICENSE file that accompanied this code.
duke@1: *
duke@1: * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@1: * version 2 for more details (a copy is included in the LICENSE file that
duke@1: * accompanied this code).
duke@1: *
duke@1: * You should have received a copy of the GNU General Public License version
duke@1: * 2 along with this work; if not, write to the Free Software Foundation,
duke@1: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1: *
ohair@554: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554: * or visit www.oracle.com if you need additional information or have any
ohair@554: * questions.
duke@1: */
duke@1:
duke@1: package com.sun.tools.javac.jvm;
duke@1:
duke@1: import java.util.*;
duke@1:
duke@1: import com.sun.tools.javac.code.Flags;
duke@1: import com.sun.tools.javac.code.Symbol;
duke@1: import com.sun.tools.javac.util.*;
duke@1:
jjg@1157: import static com.sun.tools.javac.main.Option.*;
jjg@700:
duke@1: /** The classfile version target.
duke@1: *
jjg@581: *
This is NOT part of any supported API.
jjg@581: * If you write code that depends on this, you do so at your own risk.
duke@1: * This code and its internal interfaces are subject to change or
duke@1: * deletion without notice.
duke@1: */
duke@1: public enum Target {
duke@1: JDK1_1("1.1", 45, 3),
duke@1: JDK1_2("1.2", 46, 0),
duke@1: JDK1_3("1.3", 47, 0),
duke@1:
duke@1: /** J2SE1.4 = Merlin. */
duke@1: JDK1_4("1.4", 48, 0),
duke@1:
duke@1: /** Support for the JSR14 prototype compiler (targeting 1.4 VMs
duke@1: * augmented with a few support classes). This is a transitional
duke@1: * option that will not be supported in the product. */
duke@1: JSR14("jsr14", 48, 0),
duke@1:
duke@1: /** The following are undocumented transitional targets that we
duke@1: * had used to test VM fixes in update releases. We do not
duke@1: * promise to retain support for them. */
duke@1: JDK1_4_1("1.4.1", 48, 0),
duke@1: JDK1_4_2("1.4.2", 48, 0),
duke@1:
duke@1: /** Tiger. */
duke@1: JDK1_5("1.5", 49, 0),
duke@1:
duke@1: /** JDK 6. */
duke@1: JDK1_6("1.6", 50, 0),
duke@1:
duke@1: /** JDK 7. */
darcy@1042: JDK1_7("1.7", 51, 0),
darcy@1042:
ksrini@1395: /** JDK 8. */
ksrini@1395: JDK1_8("1.8", 52, 0);
duke@1:
duke@1: private static final Context.Key targetKey =
duke@1: new Context.Key();
duke@1:
duke@1: public static Target instance(Context context) {
duke@1: Target instance = context.get(targetKey);
duke@1: if (instance == null) {
duke@1: Options options = Options.instance(context);
jjg@700: String targetString = options.get(TARGET);
duke@1: if (targetString != null) instance = lookup(targetString);
duke@1: if (instance == null) instance = DEFAULT;
duke@1: context.put(targetKey, instance);
duke@1: }
duke@1: return instance;
duke@1: }
duke@1:
vromero@1442: private static final Target MIN = values()[0];
duke@1: public static Target MIN() { return MIN; }
duke@1:
vromero@1442: private static final Target MAX = values()[values().length - 1];
duke@1: public static Target MAX() { return MAX; }
duke@1:
vromero@1442: private static final Map tab = new HashMap();
duke@1: static {
duke@1: for (Target t : values()) {
duke@1: tab.put(t.name, t);
duke@1: }
duke@1: tab.put("5", JDK1_5);
duke@1: tab.put("6", JDK1_6);
duke@1: tab.put("7", JDK1_7);
darcy@1042: tab.put("8", JDK1_8);
duke@1: }
duke@1:
duke@1: public final String name;
duke@1: public final int majorVersion;
duke@1: public final int minorVersion;
duke@1: private Target(String name, int majorVersion, int minorVersion) {
duke@1: this.name = name;
duke@1: this.majorVersion = majorVersion;
duke@1: this.minorVersion = minorVersion;
duke@1: }
duke@1:
darcy@1042: public static final Target DEFAULT = JDK1_8;
duke@1:
duke@1: public static Target lookup(String name) {
duke@1: return tab.get(name);
duke@1: }
duke@1:
duke@1: /** In -target 1.1 and earlier, the compiler is required to emit
duke@1: * synthetic method definitions in abstract classes for interface
duke@1: * methods that are not overridden. We call them "Miranda" methods.
duke@1: */
duke@1: public boolean requiresIproxy() {
duke@1: return compareTo(JDK1_1) <= 0;
duke@1: }
duke@1:
duke@1: /** Beginning in 1.4, we take advantage of the possibility of emitting
duke@1: * code to initialize fields before calling the superclass constructor.
duke@1: * This is allowed by the VM spec, but the verifier refused to allow
duke@1: * it until 1.4. This is necesary to translate some code involving
duke@1: * inner classes. See, for example, 4030374.
duke@1: */
duke@1: public boolean initializeFieldsBeforeSuper() {
duke@1: return compareTo(JDK1_4) >= 0;
duke@1: }
duke@1:
duke@1: /** Beginning with -target 1.2 we obey the JLS rules for binary
duke@1: * compatibility, emitting as the qualifying type of a reference
duke@1: * to a method or field the type of the qualifier. In earlier
duke@1: * targets we use as the qualifying type the class in which the
duke@1: * member was found. The following methods named
duke@1: * *binaryCompatibility() indicate places where we vary from this
duke@1: * general rule. */
duke@1: public boolean obeyBinaryCompatibility() {
duke@1: return compareTo(JDK1_2) >= 0;
duke@1: }
duke@1:
duke@1: /** Starting in 1.5, the compiler uses an array type as
duke@1: * the qualifier for method calls (such as clone) where required by
duke@1: * the language and VM spec. Earlier versions of the compiler
duke@1: * qualified them by Object.
duke@1: */
duke@1: public boolean arrayBinaryCompatibility() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
duke@1: /** Beginning after 1.2, we follow the binary compatibility rules for
duke@1: * interface fields. The 1.2 VMs had bugs handling interface fields
duke@1: * when compiled using binary compatibility (see 4400598), so this is
duke@1: * an accommodation to them.
duke@1: */
duke@1: public boolean interfaceFieldsBinaryCompatibility() {
duke@1: return compareTo(JDK1_2) > 0;
duke@1: }
duke@1:
duke@1: /** Beginning in -target 1.5, we follow the binary compatibility
duke@1: * rules for interface methods that redefine Object methods.
duke@1: * Earlier VMs had bugs handling such methods compiled using binary
duke@1: * compatibility (see 4392595, 4398791, 4392595, 4400415).
duke@1: * The VMs were fixed during or soon after 1.4. See 4392595.
duke@1: */
duke@1: public boolean interfaceObjectOverridesBinaryCompatibility() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
duke@1: /** Beginning in -target 1.4.2, we make synthetic variables
duke@1: * package-private instead of private. This is to prevent the
duke@1: * necessity of access methods, which effectively relax the
duke@1: * protection of the field but bloat the class files and affect
duke@1: * execution.
duke@1: */
duke@1: public boolean usePrivateSyntheticFields() {
duke@1: return compareTo(JDK1_4_2) < 0;
duke@1: }
duke@1:
duke@1: /** Sometimes we need to create a field to cache a value like a
duke@1: * class literal of the assertions flag. In -target 1.4.2 and
duke@1: * later we create a new synthetic class for this instead of
duke@1: * using the outermost class. See 4401576.
duke@1: */
duke@1: public boolean useInnerCacheClass() {
duke@1: return compareTo(JDK1_4_2) >= 0;
duke@1: }
duke@1:
duke@1: /** Return true if cldc-style stack maps need to be generated. */
duke@1: public boolean generateCLDCStackmap() {
duke@1: return false;
duke@1: }
duke@1:
duke@1: /** Beginning in -target 6, we generate stackmap attribute in
duke@1: * compact format. */
duke@1: public boolean generateStackMapTable() {
duke@1: return compareTo(JDK1_6) >= 0;
duke@1: }
duke@1:
duke@1: /** Beginning in -target 6, package-info classes are marked synthetic.
duke@1: */
duke@1: public boolean isPackageInfoSynthetic() {
duke@1: return compareTo(JDK1_6) >= 0;
duke@1: }
duke@1:
duke@1: /** Do we generate "empty" stackmap slots after double and long?
duke@1: */
duke@1: public boolean generateEmptyAfterBig() {
duke@1: return false;
duke@1: }
duke@1:
duke@1: /** Beginning in 1.5, we have an unsynchronized version of
duke@1: * StringBuffer called StringBuilder that can be used by the
duke@1: * compiler for string concatenation.
duke@1: */
duke@1: public boolean useStringBuilder() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
duke@1: /** Beginning in 1.5, we have flag bits we can use instead of
duke@1: * marker attributes.
duke@1: */
duke@1: public boolean useSyntheticFlag() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1: public boolean useEnumFlag() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1: public boolean useAnnotationFlag() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1: public boolean useVarargsFlag() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1: public boolean useBridgeFlag() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
duke@1: /** Return the character to be used in constructing synthetic
duke@1: * identifiers, where not specified by the JLS.
duke@1: */
duke@1: public char syntheticNameChar() {
duke@1: return '$';
duke@1: }
duke@1:
duke@1: /** Does the VM have direct support for class literals?
duke@1: */
duke@1: public boolean hasClassLiterals() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
jrose@267: /** Does the VM support an invokedynamic instruction?
jrose@267: */
jrose@267: public boolean hasInvokedynamic() {
jrose@267: return compareTo(JDK1_7) >= 0;
jrose@267: }
jrose@267:
mcimadamore@674: /** Does the VM support polymorphic method handle invocation?
mcimadamore@674: * Affects the linkage information output to the classfile.
mcimadamore@674: * An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together.
mcimadamore@674: */
mcimadamore@674: public boolean hasMethodHandles() {
mcimadamore@674: return hasInvokedynamic();
mcimadamore@674: }
mcimadamore@674:
duke@1: /** Although we may not have support for class literals, should we
duke@1: * avoid initializing the class that the literal refers to?
duke@1: * See 4468823
duke@1: */
duke@1: public boolean classLiteralsNoInit() {
duke@1: return compareTo(JDK1_4_2) >= 0;
duke@1: }
duke@1:
duke@1: /** Although we may not have support for class literals, when we
duke@1: * throw a NoClassDefFoundError, should we initialize its cause?
duke@1: */
duke@1: public boolean hasInitCause() {
duke@1: return compareTo(JDK1_4) >= 0;
duke@1: }
duke@1:
duke@1: /** For bootstrapping, we use J2SE1.4's wrapper class constructors
duke@1: * to implement boxing.
duke@1: */
duke@1: public boolean boxWithConstructors() {
duke@1: return compareTo(JDK1_5) < 0;
duke@1: }
duke@1:
duke@1: /** For bootstrapping, we use J2SE1.4's java.util.Collection
duke@1: * instead of java.lang.Iterable.
duke@1: */
duke@1: public boolean hasIterable() {
duke@1: return compareTo(JDK1_5) >= 0;
duke@1: }
duke@1:
duke@1: /** For bootstrapping javac only, we do without java.lang.Enum if
duke@1: * necessary.
duke@1: */
duke@1: public boolean compilerBootstrap(Symbol c) {
duke@1: return
duke@1: this == JSR14 &&
duke@1: (c.flags() & Flags.ENUM) != 0 &&
duke@1: c.flatName().toString().startsWith("com.sun.tools.")
duke@1: // && !Target.class.getSuperclass().getName().equals("java.lang.Enum")
duke@1: ;
duke@1: }
duke@1:
duke@1: /** In J2SE1.5.0, we introduced the "EnclosingMethod" attribute
duke@1: * for improved reflection support.
duke@1: */
duke@1: public boolean hasEnclosingMethodAttribute() {
duke@1: return compareTo(JDK1_5) >= 0 || this == JSR14;
duke@1: }
duke@1: }