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Get rid of generic hell. Use custom descriptor types. Use tabs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,144 +1,4 @@ | ||
| # jlinker | ||
| Java resolution library for methods and fields. | ||
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| ## example | ||
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| ```Java | ||
| package dev.xdark.jlinker; | ||
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| import org.objectweb.asm.ClassReader; | ||
| import org.objectweb.asm.tree.ClassNode; | ||
| import org.objectweb.asm.tree.FieldNode; | ||
| import org.objectweb.asm.tree.MethodNode; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.UncheckedIOException; | ||
| import java.util.List; | ||
| import java.util.function.Function; | ||
| import java.util.stream.Collectors; | ||
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| public class Example { | ||
| public static void main(String[] args) { | ||
| Function<String, ClassNode> fn = s -> { | ||
| // Ideally, the resolver should do that conversion, | ||
| // but it doesn't. Yet. | ||
| if (s.charAt(0) == '[') { | ||
| s = "java/lang/Object"; | ||
| } | ||
| ClassReader reader; | ||
| try (InputStream in = ClassLoader.getSystemResourceAsStream(s + ".class")) { | ||
| if (in == null) { | ||
| throw new IllegalStateException(s); | ||
| } | ||
| reader = new ClassReader(in); | ||
| } catch (IOException ex) { | ||
| throw new UncheckedIOException(ex); | ||
| } | ||
| ClassNode node = new ClassNode(); | ||
| // We don't care about code or debug information | ||
| reader.accept(node, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG); | ||
| return node; | ||
| }; | ||
| // Create link resolver | ||
| LinkResolver<ClassNode, MethodNode, FieldNode> resolver = LinkResolver.jvm(); | ||
| // Create class info for java/util/AbstractList | ||
| ClassInfo<ClassNode> classInfo = classInfo(fn.apply("java/util/AbstractList"), fn); | ||
| // Resolve virtual "containsAll" method | ||
| Resolution<ClassNode, MethodNode> resolution = resolver.resolveVirtualMethod(classInfo, "containsAll", "(Ljava/util/Collection;)Z").value(); | ||
| ClassNode owner = resolution.owner().innerValue(); | ||
| MethodNode m = resolution.member().innerValue(); | ||
| // Should be java/util/AbstractCollection.containsAll(Ljava/util/Collection;)Z | ||
| System.out.println(owner.name + '.' + m.name + m.desc); | ||
| } | ||
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| // Method information | ||
| private static MemberInfo<MethodNode> methodInfo(MethodNode node) { | ||
| return new MemberInfo<MethodNode>() { | ||
| @Override | ||
| public MethodNode innerValue() { | ||
| return node; | ||
| } | ||
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| @Override | ||
| public int accessFlags() { | ||
| return node.access; | ||
| } | ||
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| @Override | ||
| public boolean isPolymorphic() { | ||
| // To implement that, one should check for PolymorphicSignature annotation, | ||
| // doesn't matter in this example. Linker does not support polymorphic methods. | ||
| // Yet. | ||
| return false; | ||
| } | ||
| }; | ||
| } | ||
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| // Field information | ||
| private static MemberInfo<FieldNode> fieldInfo(FieldNode node) { | ||
| return new MemberInfo<FieldNode>() { | ||
| @Override | ||
| public FieldNode innerValue() { | ||
| return node; | ||
| } | ||
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| @Override | ||
| public int accessFlags() { | ||
| return node.access; | ||
| } | ||
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| @Override | ||
| public boolean isPolymorphic() { | ||
| return false; | ||
| } | ||
| }; | ||
| } | ||
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| // Class information | ||
| private static ClassInfo<ClassNode> classInfo(ClassNode node, Function<String, ClassNode> fn) { | ||
| return new ClassInfo<ClassNode>() { | ||
| @Override | ||
| public ClassNode innerValue() { | ||
| return node; | ||
| } | ||
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| @Override | ||
| public int accessFlags() { | ||
| return node.access; | ||
| } | ||
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| @Override | ||
| public ClassInfo<ClassNode> superClass() { | ||
| String superName = node.superName; | ||
| return superName == null ? null : classInfo(fn.apply(superName), fn); | ||
| } | ||
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| @Override | ||
| public List<ClassInfo<ClassNode>> interfaces() { | ||
| return node.interfaces.stream().map(x -> classInfo(fn.apply(x), fn)).collect(Collectors.toList()); | ||
| } | ||
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| @Override | ||
| public MemberInfo<?> getMethod(String name, String descriptor) { | ||
| for (MethodNode method : node.methods) { | ||
| if (name.equals(method.name) && descriptor.equals(method.desc)) { | ||
| return methodInfo(method); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| @Override | ||
| public MemberInfo<?> getField(String name, String descriptor) { | ||
| for (FieldNode field : node.fields) { | ||
| if (name.equals(field.name) && descriptor.equals(field.desc)) { | ||
| return fieldInfo(field); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
| }; | ||
| } | ||
| } | ||
| ``` | ||
| See tests for examples |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,5 @@ | ||
| distributionBase=GRADLE_USER_HOME | ||
| distributionPath=wrapper/dists | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip | ||
| zipStoreBase=GRADLE_USER_HOME | ||
| zipStorePath=wrapper/dists |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| package dev.xdark.jlinker; | ||
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| public interface Descriptor { | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| package dev.xdark.jlinker; | ||
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| public final class DescriptorString implements MethodDescriptor, FieldDescriptor { | ||
| private final String value; | ||
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| public DescriptorString(String value) { | ||
| this.value = value; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| return o instanceof DescriptorString && | ||
| value.equals(((DescriptorString) o).value); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return value.hashCode(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return value; | ||
| } | ||
| } |
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