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/*
* CompilerTarget.java
*
* Copyright (c) 2013 Mike Strobel
*
* This source code is based on Mono.Cecil from Jb Evain, Copyright (c) Jb Evain;
* and ILSpy/ICSharpCode from SharpDevelop, Copyright (c) AlphaSierraPapa.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0.
* A copy of the license can be found in the License.html file at the root of this distribution.
* By using this source code in any fashion, you are agreeing to be bound by the terms of the
* Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*/
package com.strobel.assembler.metadata;
import java.util.HashMap;
import java.util.Map;
public enum CompilerTarget {
JDK1_1("1.1", 45, 3),
JDK1_2("1.2", 46, 0),
JDK1_3("1.3", 47, 0),
/**
* J2SE1.4 = Merlin.
*/
JDK1_4("1.4", 48, 0),
/**
* Tiger.
*/
JDK1_5("1.5", 49, 0),
/**
* JDK 6.
*/
JDK1_6("1.6", 50, 0),
/**
* JDK 7.
*/
JDK1_7("1.7", 51, 0),
/**
* JDK 8.
*/
JDK1_8("1.8", 52, 0);
private static final CompilerTarget[] VALUES = values();
private static final CompilerTarget MIN = VALUES[0];
private static final CompilerTarget MAX = VALUES[VALUES.length - 1];
public static CompilerTarget MIN() {
return MIN;
}
public static CompilerTarget MAX() {
return MAX;
}
private static final Map tab = new HashMap<>();
static {
for (final CompilerTarget t : values()) {
tab.put(t.name, t);
}
tab.put("5", JDK1_5);
tab.put("6", JDK1_6);
tab.put("7", JDK1_7);
tab.put("8", JDK1_8);
}
public final String name;
public final int majorVersion;
public final int minorVersion;
private CompilerTarget(final String name, final int majorVersion, final int minorVersion) {
this.name = name;
this.majorVersion = majorVersion;
this.minorVersion = minorVersion;
}
public static final CompilerTarget DEFAULT = JDK1_8;
public static CompilerTarget lookup(final String name) {
return tab.get(name);
}
public static CompilerTarget lookup(final int majorVersion, final int minorVersion) {
for (final CompilerTarget target : VALUES) {
if (majorVersion < target.majorVersion) {
return target;
}
else if (minorVersion <= target.minorVersion &&
majorVersion == target.majorVersion) {
return target;
}
}
return MAX;
}
/**
* In -target 1.1 and earlier, the compiler is required to emit
* synthetic method definitions in abstract classes for interface
* methods that are not overridden. We call them "Miranda" methods.
*/
public boolean requiresIProxy() {
return compareTo(JDK1_1) <= 0;
}
/**
* Beginning in 1.4, we take advantage of the possibility of emitting
* code to initialize fields before calling the superclass constructor.
* This is allowed by the VM spec, but the verifier refused to allow
* it until 1.4. This is necessary to translate some code involving
* inner classes. See, for example, 4030374.
*/
public boolean initializeFieldsBeforeSuper() {
return compareTo(JDK1_4) >= 0;
}
/**
* Beginning with -target 1.2 we obey the JLS rules for binary
* compatibility, emitting as the qualifying type of a reference
* to a method or field the type of the qualifier. In earlier
* targets we use as the qualifying type the class in which the
* member was found. The following methods named
* *binaryCompatibility() indicate places where we vary from this
* general rule.
*/
public boolean obeyBinaryCompatibility() {
return compareTo(JDK1_2) >= 0;
}
/**
* Starting in 1.5, the compiler uses an array type as
* the qualifier for method calls (such as clone) where required by
* the language and VM spec. Earlier versions of the compiler
* qualified them by Object.
*/
public boolean arrayBinaryCompatibility() {
return compareTo(JDK1_5) >= 0;
}
/**
* Beginning after 1.2, we follow the binary compatibility rules for
* interface fields. The 1.2 VMs had bugs handling interface fields
* when compiled using binary compatibility (see 4400598), so this is
* an accommodation to them.
*/
public boolean interfaceFieldsBinaryCompatibility() {
return compareTo(JDK1_2) > 0;
}
/**
* Beginning in -target 1.5, we follow the binary compatibility
* rules for interface methods that redefine Object methods.
* Earlier VMs had bugs handling such methods compiled using binary
* compatibility (see 4392595, 4398791, 4392595, 4400415).
* The VMs were fixed during or soon after 1.4. See 4392595.
*/
public boolean interfaceObjectOverridesBinaryCompatibility() {
return compareTo(JDK1_5) >= 0;
}
/**
* Beginning in -target 1.5, we make synthetic variables
* package-private instead of private. This is to prevent the
* necessity of access methods, which effectively relax the
* protection of the field but bloat the class files and affect
* execution.
*/
public boolean usePrivateSyntheticFields() {
return compareTo(JDK1_5) < 0;
}
/**
* Sometimes we need to create a field to cache a value like a
* class literal of the assertions flag. In -target 1.5 and
* later we create a new synthetic class for this instead of
* using the outermost class. See 4401576.
*/
public boolean useInnerCacheClass() {
return compareTo(JDK1_5) >= 0;
}
/**
* Return true if CLDC-style stack maps need to be generated.
*/
public boolean generateCLDCStackMap() {
return false;
}
/**
* Beginning in -target 6, we generate stack map attribute in
* compact format.
*/
public boolean generateStackMapTable() {
return compareTo(JDK1_6) >= 0;
}
/**
* Beginning in -target 6, package-info classes are marked synthetic.
*/
public boolean isPackageInfoSynthetic() {
return compareTo(JDK1_6) >= 0;
}
/**
* Do we generate "empty" stack map slots after double and long?
*/
public boolean generateEmptyAfterBig() {
return false;
}
/**
* Beginning in 1.5, we have an unsynchronized version of
* StringBuffer called StringBuilder that can be used by the
* compiler for string concatenation.
*/
public boolean useStringBuilder() {
return compareTo(JDK1_5) >= 0;
}
/**
* Beginning in 1.5, we have flag bits we can use instead of
* marker attributes.
*/
public boolean useSyntheticFlag() {
return compareTo(JDK1_5) >= 0;
}
public boolean useEnumFlag() {
return compareTo(JDK1_5) >= 0;
}
public boolean useAnnotationFlag() {
return compareTo(JDK1_5) >= 0;
}
public boolean useVarargsFlag() {
return compareTo(JDK1_5) >= 0;
}
public boolean useBridgeFlag() {
return compareTo(JDK1_5) >= 0;
}
/**
* Return the character to be used in constructing synthetic
* identifiers, where not specified by the JLS.
*/
public char syntheticNameChar() {
return '$';
}
/**
* Does the VM have direct support for class literals?
*/
public boolean hasClassLiterals() {
return compareTo(JDK1_5) >= 0;
}
/**
* Does the VM support an invokedynamic instruction?
*/
public boolean hasInvokedynamic() {
return compareTo(JDK1_7) >= 0;
}
/**
* Does the VM support polymorphic method handle invocation?
* Affects the linkage information output to the classfile.
* An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together.
*/
public boolean hasMethodHandles() {
return hasInvokedynamic();
}
/**
* Although we may not have support for class literals, should we
* avoid initializing the class that the literal refers to?
* See 4468823
*/
public boolean classLiteralsNoInit() {
return compareTo(JDK1_5) >= 0;
}
/**
* Although we may not have support for class literals, when we
* throw a NoClassDefFoundError, should we initialize its cause?
*/
public boolean hasInitCause() {
return compareTo(JDK1_4) >= 0;
}
/**
* For bootstrapping, we use J2SE1.4's wrapper class constructors
* to implement boxing.
*/
public boolean boxWithConstructors() {
return compareTo(JDK1_5) < 0;
}
/**
* For bootstrapping, we use J2SE1.4's java.util.Collection
* instead of java.lang.Iterable.
*/
public boolean hasIterable() {
return compareTo(JDK1_5) >= 0;
}
/**
* In J2SE1.5.0, we introduced the "EnclosingMethod" attribute
* for improved reflection support.
*/
public boolean hasEnclosingMethodAttribute() {
return compareTo(JDK1_5) >= 0;
}
}
