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package lombok.eclipse.agent;
import java.lang.reflect.Field;
import lombok.eclipse.Eclipse;
import lombok.patcher.Hook;
import lombok.patcher.MethodTarget;
import lombok.patcher.ScriptManager;
import lombok.patcher.StackRequest;
import lombok.patcher.scripts.ScriptBuilder;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractVariableDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.ForeachStatement;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.lookup.ArrayBinding;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
import org.eclipse.jdt.internal.compiler.lookup.ParameterizedTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
import org.eclipse.jdt.internal.compiler.parser.Parser;
public class PatchVal {
// Creates a copy of the 'initialization' field on a LocalDeclaration if the type of the LocalDeclaration is 'val', because the completion parser will null this out,
// which in turn stops us from inferring the intended type for 'val x = 5;'. We look at the copy.
// Also patches local declaration to not call .resolveType() on the initializer expression if we've already done so (calling it twice causes weird errors),
// and patches .resolve() on LocalDeclaration itself to just-in-time replace the 'val' vartype with the right one.
static void addPatches(ScriptManager sm, boolean ecj) {
final String LOCALDECLARATION_SIG = "org.eclipse.jdt.internal.compiler.ast.LocalDeclaration";
final String FOREACHSTATEMENT_SIG = "org.eclipse.jdt.internal.compiler.ast.ForeachStatement";
final String EXPRESSION_SIG = "org.eclipse.jdt.internal.compiler.ast.Expression";
final String BLOCKSCOPE_SIG = "org.eclipse.jdt.internal.compiler.lookup.BlockScope";
final String PARSER_SIG = "org.eclipse.jdt.internal.compiler.parser.Parser";
final String TYPEBINDING_SIG = "org.eclipse.jdt.internal.compiler.lookup.TypeBinding";
sm.addScript(ScriptBuilder.exitEarly()
.target(new MethodTarget(LOCALDECLARATION_SIG, "resolve", "void", BLOCKSCOPE_SIG))
.request(StackRequest.THIS, StackRequest.PARAM1)
.decisionMethod(new Hook("lombok.eclipse.agent.PatchVal", "handleValForLocalDeclaration", "boolean", LOCALDECLARATION_SIG, BLOCKSCOPE_SIG))
.build());
sm.addScript(ScriptBuilder.replaceMethodCall()
.target(new MethodTarget(LOCALDECLARATION_SIG, "resolve", "void", BLOCKSCOPE_SIG))
.methodToReplace(new Hook(EXPRESSION_SIG, "resolveType", TYPEBINDING_SIG, BLOCKSCOPE_SIG))
.requestExtra(StackRequest.THIS)
.replacementMethod(new Hook("lombok.eclipse.agent.PatchVal", "skipResolveInitializerIfAlreadyCalled2", TYPEBINDING_SIG, EXPRESSION_SIG, BLOCKSCOPE_SIG, LOCALDECLARATION_SIG))
.build());
sm.addScript(ScriptBuilder.replaceMethodCall()
.target(new MethodTarget(FOREACHSTATEMENT_SIG, "resolve", "void", BLOCKSCOPE_SIG))
.methodToReplace(new Hook(EXPRESSION_SIG, "resolveType", TYPEBINDING_SIG, BLOCKSCOPE_SIG))
.replacementMethod(new Hook("lombok.eclipse.agent.PatchVal", "skipResolveInitializerIfAlreadyCalled", TYPEBINDING_SIG, EXPRESSION_SIG, BLOCKSCOPE_SIG))
.build());
sm.addScript(ScriptBuilder.exitEarly()
.target(new MethodTarget(FOREACHSTATEMENT_SIG, "resolve", "void", BLOCKSCOPE_SIG))
.request(StackRequest.THIS, StackRequest.PARAM1)
.decisionMethod(new Hook("lombok.eclipse.agent.PatchVal", "handleValForForEach", "boolean", FOREACHSTATEMENT_SIG, BLOCKSCOPE_SIG))
.build());
if (!ecj) {
sm.addScript(ScriptBuilder.addField()
.fieldName("$initCopy")
.fieldType("Lorg/eclipse/jdt/internal/compiler/ast/ASTNode;")
.setPublic()
.setTransient()
.targetClass("org.eclipse.jdt.internal.compiler.ast.LocalDeclaration")
.build());
sm.addScript(ScriptBuilder.addField()
.fieldName("$iterableCopy")
.fieldType("Lorg/eclipse/jdt/internal/compiler/ast/ASTNode;")
.setPublic()
.setTransient()
.targetClass("org.eclipse.jdt.internal.compiler.ast.LocalDeclaration")
.build());
sm.addScript(ScriptBuilder.wrapReturnValue()
.target(new MethodTarget(PARSER_SIG, "consumeExitVariableWithInitialization", "void"))
.request(StackRequest.THIS)
.wrapMethod(new Hook("lombok.eclipse.agent.PatchVal", "copyInitializationOfLocalDeclaration", "void", PARSER_SIG))
.build());
sm.addScript(ScriptBuilder.wrapReturnValue()
.target(new MethodTarget(PARSER_SIG, "consumeEnhancedForStatementHeader", "void"))
.request(StackRequest.THIS)
.wrapMethod(new Hook("lombok.eclipse.agent.PatchVal", "copyInitializationOfForEachIterable", "void", PARSER_SIG))
.build());
}
}
private static final class Reflection {
private static final Field initCopyField, iterableCopyField;
private static final Field astStackField, astPtrField;
static {
Field a = null, b = null, c = null, d = null;
try {
a = LocalDeclaration.class.getDeclaredField("$initCopy");
b = LocalDeclaration.class.getDeclaredField("$iterableCopy");
} catch (Throwable t) {
//ignore - no $initCopy exists when running in ecj.
}
try {
c = Parser.class.getDeclaredField("astStack");
c.setAccessible(true);
d = Parser.class.getDeclaredField("astPtr");
d.setAccessible(true);
} catch (Exception e) {
// Most likely we're in ecj or some other plugin usage of the eclipse compiler. No need for this.
}
initCopyField = a;
iterableCopyField = b;
astStackField = c;
astPtrField = d;
}
}
public static void copyInitializationOfLocalDeclaration(Parser parser) {
ASTNode[] astStack;
int astPtr;
try {
astStack = (ASTNode[]) Reflection.astStackField.get(parser);
astPtr = (Integer)Reflection.astPtrField.get(parser);
} catch (Exception e) {
// Most likely we're in ecj or some other plugin usage of the eclipse compiler. No need for this.
return;
}
AbstractVariableDeclaration variableDecl = (AbstractVariableDeclaration) astStack[astPtr];
if (!(variableDecl instanceof LocalDeclaration)) return;
ASTNode init = variableDecl.initialization;
if (init == null) return;
if (variableDecl.type instanceof SingleTypeReference) {
SingleTypeReference ref = (SingleTypeReference) variableDecl.type;
if (ref.token == null || ref.token.length != 3 || ref.token[0] != 'v' || ref.token[1] != 'a' || ref.token[2] != 'l') return;
} else return;
try {
if (Reflection.initCopyField != null) Reflection.initCopyField.set(variableDecl, init);
} catch (Exception e) {
// In ecj mode this field isn't there and we don't need the copy anyway, so, we ignore the exception.
}
}
public static TypeBinding skipResolveInitializerIfAlreadyCalled(Expression expr, BlockScope scope) {
if (expr.resolvedType != null) return expr.resolvedType;
return expr.resolveType(scope);
}
public static TypeBinding skipResolveInitializerIfAlreadyCalled2(Expression expr, BlockScope scope, LocalDeclaration decl) {
if (decl != null && LocalDeclaration.class.equals(decl.getClass()) && expr.resolvedType != null) return expr.resolvedType;
return expr.resolveType(scope);
}
public static boolean handleValForLocalDeclaration(LocalDeclaration local, BlockScope scope) {
if (local == null || !LocalDeclaration.class.equals(local.getClass())) return false;
boolean decomponent = false;
if (local.type instanceof SingleTypeReference) {
char[] token = ((SingleTypeReference)local.type).token;
if (token == null || token.length != 3) return false;
else if (token[0] != 'v' || token[1] != 'a' || token[2] != 'l') return false;
} else return false;
Expression init = local.initialization;
if (init == null && Reflection.initCopyField != null) {
try {
init = (Expression) Reflection.initCopyField.get(local);
} catch (Exception e) {
}
}
if (init == null && Reflection.iterableCopyField != null) {
try {
init = (Expression) Reflection.iterableCopyField.get(local);
decomponent = true;
} catch (Exception e) {
}
}
TypeReference replacement = null;
if (init != null && decomponent) {
}
if (init != null) {
TypeBinding resolved = decomponent ? getForEachComponentType(init, scope) : init.resolveType(scope);
if (resolved != null) {
replacement = Eclipse.makeType(resolved, local.type, false);
}
}
local.modifiers |= ClassFileConstants.AccFinal;
local.type = replacement != null ? replacement : new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, Eclipse.poss(local.type, 3));
return false;
}
public static void copyInitializationOfForEachIterable(Parser parser) {
ASTNode[] astStack;
int astPtr;
try {
astStack = (ASTNode[]) Reflection.astStackField.get(parser);
astPtr = (Integer) Reflection.astPtrField.get(parser);
} catch (Exception e) {
// Most likely we're in ecj or some other plugin usage of the eclipse compiler. No need for this.
return;
}
ForeachStatement foreachDecl = (ForeachStatement) astStack[astPtr];
ASTNode init = foreachDecl.collection;
if (init == null) return;
if (foreachDecl.elementVariable != null && foreachDecl.elementVariable.type instanceof SingleTypeReference) {
SingleTypeReference ref = (SingleTypeReference) foreachDecl.elementVariable.type;
if (ref.token == null || ref.token.length != 3 || ref.token[0] != 'v' || ref.token[1] != 'a' || ref.token[2] != 'l') return;
} else return;
try {
if (Reflection.iterableCopyField != null) Reflection.iterableCopyField.set(foreachDecl.elementVariable, init);
} catch (Exception e) {
// In ecj mode this field isn't there and we don't need the copy anyway, so, we ignore the exception.
}
}
public static boolean handleValForForEach(ForeachStatement forEach, BlockScope scope) {
if (forEach.elementVariable != null && forEach.elementVariable.type instanceof SingleTypeReference) {
char[] token = ((SingleTypeReference)forEach.elementVariable.type).token;
if (token == null || token.length != 3) return false;
else if (token[0] != 'v' || token[1] != 'a' || token[2] != 'l') return false;
} else return false;
TypeBinding component = getForEachComponentType(forEach.collection, scope);
TypeReference replacement = Eclipse.makeType(component, forEach.elementVariable.type, false);
forEach.elementVariable.modifiers |= ClassFileConstants.AccFinal;
forEach.elementVariable.type = replacement != null ? replacement :
new QualifiedTypeReference(TypeConstants.JAVA_LANG_OBJECT, Eclipse.poss(forEach.elementVariable.type, 3));
return false;
}
private static TypeBinding getForEachComponentType(Expression collection, BlockScope scope) {
if (collection != null) {
TypeBinding resolved = collection.resolveType(scope);
if (resolved.isArrayType()) {
resolved = ((ArrayBinding) resolved).elementsType();
return resolved;
} else if (resolved instanceof ReferenceBinding) {
ReferenceBinding iterableType = ((ReferenceBinding)resolved).findSuperTypeOriginatingFrom(TypeIds.T_JavaLangIterable, false);
TypeBinding[] arguments = null;
if (iterableType != null) switch (iterableType.kind()) {
case Binding.GENERIC_TYPE : // for (T t : Iterable<T>) - in case used inside Iterable itself
arguments = iterableType.typeVariables();
break;
case Binding.PARAMETERIZED_TYPE : // for(E e : Iterable<E>)
arguments = ((ParameterizedTypeBinding)iterableType).arguments;
break;
}
if (arguments != null && arguments.length == 1) {
return arguments[0];
}
}
}
return null;
}
}
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