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Make lambdas castable
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This commit is contained in:
Daniel Holle 2024-07-19 17:26:39 +02:00
parent ec92b5d5e1
commit 63493ed0f7
7 changed files with 193 additions and 114 deletions
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16
resources/bytecode/javFiles/LamRunnable.jav
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@ -1,16 +0,0 @@
import java.lang.Runnable;
import java.lang.System;
import java.lang.String;
import java.io.PrintStream;
public class LamRunnable {
public LamRunnable() {
Runnable lam = () -> {
System.out.println("lambda");
};
lam.run();
}
}

228
src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
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@ -5,6 +5,8 @@ import de.dhbwstuttgart.exceptions.NotImplementedException;
import de.dhbwstuttgart.parser.NullToken;
import de.dhbwstuttgart.parser.scope.JavaClassName;
import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
import de.dhbwstuttgart.syntaxtree.Method;
import de.dhbwstuttgart.syntaxtree.Pattern;
import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.target.generate.ASTToTargetAST;
import de.dhbwstuttgart.target.generate.StatementToTargetExpression;
@ -31,15 +33,21 @@ public class Codegen {
private final JavaTXCompiler compiler;
private final ASTToTargetAST converter;
public Codegen(TargetStructure clazz, JavaTXCompiler compiler, ASTToTargetAST converter) {
this.clazz = clazz;
this.className = clazz.qualifiedName().getClassName();
this.cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS) {
private class CustomClassWriter extends ClassWriter {
public CustomClassWriter() {
super(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
}
@Override
protected ClassLoader getClassLoader() {
return compiler.getClassLoader();
}
};
}
public Codegen(TargetStructure clazz, JavaTXCompiler compiler, ASTToTargetAST converter) {
this.clazz = clazz;
this.className = clazz.qualifiedName().getClassName();
this.cw = new CustomClassWriter();
this.compiler = compiler;
this.converter = converter;
}
@ -82,8 +90,6 @@ public class Codegen {
int localCounter;
MethodVisitor mv;
TargetType returnType;
// This is used to remember the type from lambda expressions
TargetType contextType;
Stack<BreakEnv> breakStack = new Stack<>();
Stack<Integer> switchResultValue = new Stack<>();
@ -270,13 +276,40 @@ public class Codegen {
mv.visitInsn(I2F);
else if (dest.equals(TargetType.Double))
mv.visitInsn(I2D);
} else if (isFunctionalInterface(source) && isFunctionalInterface(dest) &&
!(source instanceof TargetFunNType && dest instanceof TargetFunNType)) {
boxFunctionalInterface(state, source, dest);
} else if (!(dest instanceof TargetGenericType)) {
boxPrimitive(state, source);
//boxPrimitive(state, source);
mv.visitTypeInsn(CHECKCAST, dest.getInternalName());
unboxPrimitive(state, dest);
}
}
record TypePair(TargetType from, TargetType to) {}
private Map<TypePair, String> funWrapperClasses = new HashMap<>();
private void boxFunctionalInterface(State state, TargetType source, TargetType dest) {
var mv = state.mv;
var className = "FunWrapper$$" +
source.name().replaceAll("\\.", "\\$") +
"$_$" +
dest.name().replaceAll("\\.", "\\$");
funWrapperClasses.put(new TypePair(source, dest), className);
mv.visitTypeInsn(NEW, className);
mv.visitInsn(DUP_X1);
mv.visitInsn(SWAP);
mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "(" + source.toDescriptor() + ")V", false);
}
private boolean isFunctionalInterface(TargetType type) {
if (type instanceof TargetFunNType) return true;
if (type instanceof TargetRefType)
return compiler.getClass(new JavaClassName(type.name())).isFunctionalInterface();
return false;
}
private TargetType largerType(TargetType left, TargetType right) {
if (left.equals(TargetType.String) || right.equals(TargetType.String)) {
return TargetType.String;
@ -727,41 +760,15 @@ public class Codegen {
var mv = state.mv;
String methodName = "apply";
TargetMethod.Signature signature = null;
if (!(state.contextType instanceof TargetFunNType ctx)) {
var intf = compiler.getClass(new JavaClassName(state.contextType.name()));
if (intf != null) {
var method = intf.getMethods().stream().filter(m -> Modifier.isAbstract(m.modifier)).findFirst().orElseThrow();
methodName = method.getName();
var methodParams = new ArrayList<MethodParameter>();
for (var i = 0; i < lambda.signature().parameters().size(); i++) {
var param = lambda.signature().parameters().get(i);
var tpe = converter.convert(method.getParameterList().getParameterAt(i).getType());
methodParams.add(param.withType(tpe));
}
var retType = converter.convert(method.getReturnType());
signature = new TargetMethod.Signature(Set.of(), methodParams, retType);
}
}
if (signature == null) {
signature = new TargetMethod.Signature(Set.of(), lambda.signature().parameters().stream().map(par -> par.withType(TargetType.Object)).toList(), TargetType.Object);
}
signature = new TargetMethod.Signature(
signature.generics(),
signature.parameters().stream().map(par ->
par.withType(par.pattern().type() instanceof TargetGenericType ? TargetType.Object : par.pattern().type())
).toList(),
signature.returnType() instanceof TargetGenericType ? TargetType.Object : signature.returnType()
);
TargetMethod.Signature signature = new TargetMethod.Signature(Set.of(),
lambda.signature().parameters().stream().map(
par -> par.withType(TargetType.Object)).toList(),
lambda.signature().returnType() != null ? TargetType.Object : null);
var parameters = new ArrayList<>(lambda.captures());
parameters.addAll(signature.parameters());
var implSignature = new TargetMethod.Signature(Set.of(), parameters, lambda.signature().returnType());
// Normalize
TargetMethod impl;
if (lambdas.containsKey(lambda)) {
impl = lambdas.get(lambda);
@ -782,7 +789,6 @@ public class Codegen {
params.add(new TargetRefType(clazz.qualifiedName().getClassName()));
params.addAll(lambda.captures().stream().map(mp -> mp.pattern().type()).toList());
var descriptor = TargetMethod.getDescriptor(state.contextType, params.toArray(TargetType[]::new));
mv.visitVarInsn(ALOAD, 0);
for (var index = 0; index < lambda.captures().size(); index++) {
var capture = lambda.captures().get(index);
@ -792,9 +798,42 @@ public class Codegen {
mv.visitTypeInsn(CHECKCAST, capture.pattern().type().getInternalName());
}
var descriptor = TargetMethod.getDescriptor(lambda.type(), params.toArray(TargetType[]::new));
mv.visitInvokeDynamicInsn(methodName, descriptor, bootstrap, Type.getType(signature.getSignature()), handle, Type.getType(signature.getDescriptor()));
}
private int findReturnCode(TargetType returnType) {
if (returnType.equals(TargetType.boolean_)
|| returnType.equals(TargetType.char_)
|| returnType.equals(TargetType.int_)
|| returnType.equals(TargetType.short_)
|| returnType.equals(TargetType.byte_))
return IRETURN;
else if (returnType.equals(TargetType.long_))
return LRETURN;
else if (returnType.equals(TargetType.float_))
return FRETURN;
else if (returnType.equals(TargetType.double_))
return DRETURN;
return ARETURN;
}
private int findLoadCode(TargetType loadType) {
if (loadType.equals(TargetType.boolean_)
|| loadType.equals(TargetType.char_)
|| loadType.equals(TargetType.int_)
|| loadType.equals(TargetType.short_)
|| loadType.equals(TargetType.byte_))
return ILOAD;
else if (loadType.equals(TargetType.long_))
return LLOAD;
else if (loadType.equals(TargetType.float_))
return FLOAD;
else if (loadType.equals(TargetType.double_))
return DLOAD;
return ALOAD;
}
private void generate(State state, TargetExpression expr) {
var mv = state.mv;
switch (expr) {
@ -819,10 +858,7 @@ public class Codegen {
break;
}
case TargetCast cast:
var ctx = state.contextType;
state.contextType = cast.type();
generate(state, cast.expr());
state.contextType = ctx;
convertTo(state, cast.expr().type(), cast.type());
break;
case TargetInstanceOf instanceOf:
@ -867,10 +903,7 @@ public class Codegen {
case TargetAssign assign: {
switch (assign.left()) {
case TargetLocalVar localVar -> {
var ctype = state.contextType;
state.contextType = localVar.type();
generate(state, assign.right());
state.contextType = ctype;
convertTo(state, assign.right().type(), localVar.type());
boxPrimitive(state, localVar.type());
@ -883,10 +916,7 @@ public class Codegen {
if (!(dot.left() instanceof TargetThis && dot.isStatic()))
generate(state, dot.left());
var ctype = state.contextType;
state.contextType = fieldType;
generate(state, assign.right());
state.contextType = ctype;
convertTo(state, assign.right().type(), fieldType);
boxPrimitive(state, fieldType);
@ -1016,29 +1046,12 @@ public class Codegen {
case TargetReturn ret: {
if (ret.expression() != null && state.returnType != null) {
if (state.returnType instanceof TargetPrimitiveType) {
var ctype = state.contextType;
state.contextType = state.returnType;
generate(state, ret.expression());
state.contextType = ctype;
unboxPrimitive(state, state.returnType);
if (state.returnType.equals(TargetType.boolean_)
|| state.returnType.equals(TargetType.char_)
|| state.returnType.equals(TargetType.int_)
|| state.returnType.equals(TargetType.short_)
|| state.returnType.equals(TargetType.byte_))
mv.visitInsn(IRETURN);
else if (state.returnType.equals(TargetType.long_))
mv.visitInsn(LRETURN);
else if (state.returnType.equals(TargetType.float_))
mv.visitInsn(FRETURN);
else if (state.returnType.equals(TargetType.double_))
mv.visitInsn(DRETURN);
mv.visitInsn(findReturnCode(state.returnType));
} else {
var ctype = state.contextType;
state.contextType = state.returnType;
generate(state, ret.expression());
state.contextType = ctype;
boxPrimitive(state, ret.expression().type());
convertTo(state, ret.expression().type(), state.returnType);
mv.visitInsn(ARETURN);
@ -1089,12 +1102,10 @@ public class Codegen {
for (var i = 0; i < call.args().size(); i++) {
var e = call.args().get(i);
var arg = call.parameterTypes().get(i);
var ctype = state.contextType;
state.contextType = arg;
generate(state, e);
convertTo(state, e.type(), arg);
if (!(arg instanceof TargetPrimitiveType))
boxPrimitive(state, e.type());
state.contextType = ctype;
}
var descriptor = call.getDescriptor();
if (call.owner() instanceof TargetFunNType) // Decay FunN
@ -1597,6 +1608,85 @@ public class Codegen {
if (clazz instanceof TargetRecord)
generateRecordMethods();
// Generate wrapper classes for function types
for (var pair : funWrapperClasses.keySet()) {
var className = funWrapperClasses.get(pair);
ClassWriter cw2 = new CustomClassWriter();
cw2.visit(V1_8, ACC_PUBLIC, className, null, "java/lang/Object", new String[] { pair.to.getInternalName() });
cw2.visitField(ACC_PRIVATE, "wrapped", pair.from.toDescriptor(), null, null).visitEnd();
// Generate constructor
var ctor = cw2.visitMethod(ACC_PUBLIC, "<init>", "(" + pair.from.toDescriptor() + ")V", null, null);
ctor.visitVarInsn(ALOAD, 0);
ctor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
ctor.visitVarInsn(ALOAD, 0);
ctor.visitVarInsn(ALOAD, 1);
ctor.visitFieldInsn(PUTFIELD, className, "wrapped", pair.from.toDescriptor());
ctor.visitInsn(RETURN);
ctor.visitMaxs(0, 0);
ctor.visitEnd();
String methodName = "apply";
String fromDescriptor = null;
TargetType fromReturn = null;
if (!(pair.from instanceof TargetFunNType funNType)) {
var fromClass = compiler.getClass(new JavaClassName(pair.from.name()));
var fromMethod = fromClass.getMethods().stream().filter(m -> (m.modifier & ACC_ABSTRACT) != 0).findFirst().orElseThrow();
methodName = fromMethod.name;
fromReturn = converter.convert(fromMethod.getReturnType());
var fromParams = converter.convert(fromMethod.getParameterList(), converter.generics.javaGenerics()).stream().map(m -> m.pattern().type()).toArray(TargetType[]::new);
fromDescriptor = TargetMethod.getDescriptor(fromReturn, fromParams);
} else {
fromReturn = funNType.arity() > 1 ? TargetType.Object : null;
fromDescriptor = funNType.toMethodDescriptor();
}
var toClass = compiler.getClass(new JavaClassName(pair.to.name()));
var toMethod = toClass.getMethods().stream().filter(m -> (m.modifier & ACC_ABSTRACT) != 0).findFirst().orElseThrow();
var toReturn = converter.convert(toMethod.getReturnType());
var toParams = converter.convert(toMethod.getParameterList(), converter.generics.javaGenerics()).stream().map(m -> m.pattern().type()).toArray(TargetType[]::new);
var toDescriptor = TargetMethod.getDescriptor(toReturn, toParams);
// Generate wrapper method
var mv = cw2.visitMethod(ACC_PUBLIC, toMethod.name, toDescriptor, null, null);
var state = new State(null, mv, 0);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, className, "wrapped", pair.from.toDescriptor());
for (var i = 0; i < toParams.length; i++) {
var arg = toParams[i];
mv.visitVarInsn(findLoadCode(arg), i + 1);
}
mv.visitMethodInsn(INVOKEINTERFACE, pair.from.getInternalName(), methodName, fromDescriptor, true);
if (fromReturn != null) {
if (toReturn instanceof TargetPrimitiveType) {
convertTo(state, fromReturn, TargetType.toWrapper(toReturn));
} else convertTo(state, fromReturn, toReturn);
}
if (toReturn != null)
mv.visitInsn(findReturnCode(toReturn));
else mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw2.visitEnd();
var bytes = cw2.toByteArray();
converter.auxiliaries.put(className, bytes);
// TODO These class loading shenanigans happen in a few places, the tests load the classes individually.
// Instead we should just look at the folder.
try {
converter.classLoader.findClass(className);
} catch (ClassNotFoundException e) {
try {
converter.classLoader.loadClass(bytes);
} catch (LinkageError ignored) {}
}
}
cw.visitEnd();
return cw.toByteArray();
}

4
src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
View File

@ -57,7 +57,7 @@ public class ASTToTargetAST {
}
protected IByteArrayClassLoader classLoader;
public IByteArrayClassLoader classLoader;
protected SourceFile sourceFile;
public ASTToTargetAST(List<ResultSet> resultSets) {
@ -483,7 +483,7 @@ public class ASTToTargetAST {
if (gep.parameters.get(i) != null)
filteredParams.add(newParams.get(i));
}
return TargetFunNType.fromParams(params, filteredParams);
return TargetFunNType.fromParams(params, filteredParams, params.size());
}
private boolean isSubtype(TargetType test, TargetType other) {

24
src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java
View File

@ -4,15 +4,29 @@ import de.dhbwstuttgart.bytecode.FunNGenerator;
import java.util.List;
public record TargetFunNType(String name, List<TargetType> params) implements TargetSpecializedType {
public record TargetFunNType(String name, List<TargetType> params, int arity) implements TargetSpecializedType {
public static TargetFunNType fromParams(List<TargetType> params) {
return fromParams(params, params);
public static TargetFunNType fromParams(List<TargetType> params, int arity) {
return fromParams(params, params, arity);
}
public static TargetFunNType fromParams(List<TargetType> params, List<TargetType> realParams) {
public static TargetFunNType fromParams(List<TargetType> params, List<TargetType> realParams, int arity) {
var name = FunNGenerator.getSpecializedClassName(FunNGenerator.getArguments(params), FunNGenerator.getReturnType(params));
return new TargetFunNType(name, realParams);
return new TargetFunNType(name, realParams, arity);
}
public String toMethodDescriptor() {
var res = "(";
for (var i = 0; i < arity - 1; i++) {
res += "Ljava/lang/Object;";
}
res += ")";
if (arity > 0) {
res += "Ljava/lang/Object;";
} else {
res += "V";
}
return res;
}
@Override

24
src/main/java/de/dhbwstuttgart/target/tree/type/TargetType.java
View File

@ -53,19 +53,17 @@ public sealed interface TargetType
};
}
static TargetType toTargetType(Class<?> clazz) {
if (clazz.isPrimitive()) {
if (clazz.equals(boolean.class)) return boolean_;
if (clazz.equals(char.class)) return char_;
if (clazz.equals(byte.class)) return byte_;
if (clazz.equals(short.class)) return short_;
if (clazz.equals(int.class)) return int_;
if (clazz.equals(long.class)) return long_;
if (clazz.equals(float.class)) return float_;
if (clazz.equals(double.class)) return double_;
}
if (clazz.equals(void.class)) return null;
return new TargetRefType(clazz.getName());
static TargetType toWrapper(TargetType f) {
if (f.equals(boolean_)) return Boolean;
if (f.equals(char_)) return Char;
if (f.equals(byte_)) return Byte;
if (f.equals(short_)) return Short;
if (f.equals(int_)) return Integer;
if (f.equals(long_)) return Long;
if (f.equals(float_)) return Float;
if (f.equals(double_)) return Double;
return f;
}
String toSignature();

7
src/test/java/TestComplete.java
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@ -860,13 +860,6 @@ public class TestComplete {
var instance = clazz.getDeclaredConstructor().newInstance();
}
@Test
public void testLamRunnable() throws Exception {
var classFiles = generateClassFiles(new ByteArrayClassLoader(), "LamRunnable.jav");
var clazz = classFiles.get("LamRunnable");
var instance = clazz.getDeclaredConstructor().newInstance();
}
@Test
public void testAccess() throws Exception {
var classFiles = generateClassFiles(new ByteArrayClassLoader(), "Access.jav");

2
src/test/java/targetast/TestCodegen.java
View File

@ -277,7 +277,7 @@ public class TestCodegen {
public void testLambda() throws Exception {
var classLoader = new ByteArrayClassLoader();
// var fun = classLoader.loadClass(Path.of(System.getProperty("user.dir"), "src/test/java/targetast/Fun1$$.class"));
var interfaceType = TargetFunNType.fromParams(List.of(TargetType.Integer));
var interfaceType = TargetFunNType.fromParams(List.of(TargetType.Integer), 1);
var targetClass = new TargetClass(Opcodes.ACC_PUBLIC, new JavaClassName("CGLambda"));
targetClass.addConstructor(Opcodes.ACC_PUBLIC, List.of(), new TargetBlock(List.of(new TargetMethodCall(null, new TargetSuper(TargetType.Object), List.of(), TargetType.Object, "<init>", false, false, false))));