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From pa...@apache.org
Subject [groovy] 04/20: Minor refactor and prepare to infer parameter types of method reference
Date Mon, 08 Apr 2019 12:58:56 GMT
This is an automated email from the ASF dual-hosted git repository.

paulk pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/groovy.git

commit 67edd2df0a677fb60d305825a236f563b0b49acc
Author: Daniel Sun <sunlan@apache.org>
AuthorDate: Sun Mar 3 12:09:24 2019 +0800

    Minor refactor and prepare to infer parameter types of method reference
    
    try to reuse the existing type inference of lambda expression
---
 .../asm/sc/AbstractFunctionInterfaceWriter.java    | 34 +++++++++++++++++-----
 ...icTypesBinaryExpressionMultiTypeDispatcher.java |  4 +--
 .../classgen/asm/sc/StaticTypesLambdaWriter.java   | 23 +++------------
 ...StaticTypesMethodReferenceExpressionWriter.java | 23 +++------------
 .../transform/stc/StaticTypeCheckingVisitor.java   | 24 +++++++--------
 .../groovy/transform/stc/StaticTypesMarker.java    |  2 +-
 src/test/groovy/bugs/Groovy9008.groovy             |  5 ++++
 7 files changed, 52 insertions(+), 63 deletions(-)

diff --git a/src/main/java/org/codehaus/groovy/classgen/asm/sc/AbstractFunctionInterfaceWriter.java
b/src/main/java/org/codehaus/groovy/classgen/asm/sc/AbstractFunctionInterfaceWriter.java
index ea7f5cb..f543be8 100644
--- a/src/main/java/org/codehaus/groovy/classgen/asm/sc/AbstractFunctionInterfaceWriter.java
+++ b/src/main/java/org/codehaus/groovy/classgen/asm/sc/AbstractFunctionInterfaceWriter.java
@@ -20,30 +20,29 @@ package org.codehaus.groovy.classgen.asm.sc;
 
 import org.codehaus.groovy.ast.ClassNode;
 import org.codehaus.groovy.ast.MethodNode;
+import org.codehaus.groovy.ast.Parameter;
 import org.codehaus.groovy.ast.expr.Expression;
 import org.codehaus.groovy.classgen.asm.BytecodeHelper;
 import org.objectweb.asm.Handle;
 import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
 
 import java.util.Arrays;
 
-import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_FUNCTION_INTERFACE_TYPE;
-import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_TYPE;
+import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_FUNCTIONAL_INTERFACE_TYPE;
 import static org.codehaus.groovy.transform.stc.StaticTypesMarker.PARAMETER_TYPE;
 
 /**
  * @since 3.0.0
  */
 public interface AbstractFunctionInterfaceWriter {
-    default ClassNode getFunctionInterfaceType(Expression expression) {
-        ClassNode type = expression.getNodeMetaData(INFERRED_TYPE);
+    String ORIGINAL_PARAMETERS_WITH_EXACT_TYPE = "__ORIGINAL_PARAMETERS_WITH_EXACT_TYPE";
 
-        if (null == type) {
-            type = expression.getNodeMetaData(PARAMETER_TYPE);
-        }
+    default ClassNode getFunctionalInterfaceType(Expression expression) {
+        ClassNode type = expression.getNodeMetaData(PARAMETER_TYPE);
 
         if (null == type) {
-            type = expression.getNodeMetaData(INFERRED_FUNCTION_INTERFACE_TYPE);
+            type = expression.getNodeMetaData(INFERRED_FUNCTIONAL_INTERFACE_TYPE);
         }
         return type;
     }
@@ -66,4 +65,23 @@ public interface AbstractFunctionInterfaceWriter {
                 isInterface
         );
     }
+
+    default Object[] createBootstrapMethodArguments(String abstractMethodDesc, ClassNode
methodOwnerClassNode, MethodNode methodNode) {
+        Parameter[] parameters = methodNode.getNodeMetaData(ORIGINAL_PARAMETERS_WITH_EXACT_TYPE);
+        if (null == parameters) {
+            parameters = methodNode.getParameters();
+        }
+
+        return new Object[]{
+                Type.getType(abstractMethodDesc),
+                new Handle(
+                        Opcodes.H_INVOKEVIRTUAL,
+                        BytecodeHelper.getClassInternalName(methodOwnerClassNode.getName()),
+                        methodNode.getName(),
+                        BytecodeHelper.getMethodDescriptor(methodNode),
+                        methodOwnerClassNode.isInterface()
+                ),
+                Type.getType(BytecodeHelper.getMethodDescriptor(methodNode.getReturnType(),
parameters))
+        };
+    }
 }
diff --git a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesBinaryExpressionMultiTypeDispatcher.java
b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesBinaryExpressionMultiTypeDispatcher.java
index 21f116b..e5e27bc 100644
--- a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesBinaryExpressionMultiTypeDispatcher.java
+++ b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesBinaryExpressionMultiTypeDispatcher.java
@@ -74,7 +74,7 @@ import static org.codehaus.groovy.ast.ClassHelper.long_TYPE;
 import static org.codehaus.groovy.transform.sc.StaticCompilationVisitor.ARRAYLIST_ADD_METHOD;
 import static org.codehaus.groovy.transform.sc.StaticCompilationVisitor.ARRAYLIST_CLASSNODE;
 import static org.codehaus.groovy.transform.sc.StaticCompilationVisitor.ARRAYLIST_CONSTRUCTOR;
-import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_FUNCTION_INTERFACE_TYPE;
+import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_FUNCTIONAL_INTERFACE_TYPE;
 import static org.codehaus.groovy.transform.stc.StaticTypesMarker.INFERRED_TYPE;
 
 /**
@@ -152,7 +152,7 @@ public class StaticTypesBinaryExpressionMultiTypeDispatcher extends BinaryExpres
         } else {
             Expression rightExpression = expression.getRightExpression();
             if (rightExpression instanceof LambdaExpression || rightExpression instanceof
MethodReferenceExpression) {
-                rightExpression.putNodeMetaData(INFERRED_FUNCTION_INTERFACE_TYPE, leftExpression.getNodeMetaData(INFERRED_TYPE));
+                rightExpression.putNodeMetaData(INFERRED_FUNCTIONAL_INTERFACE_TYPE, leftExpression.getNodeMetaData(INFERRED_TYPE));
             }
         }
         // GROOVY-5620: Spread safe/Null safe operator on LHS is not supported
diff --git a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesLambdaWriter.java
b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesLambdaWriter.java
index 891e7e7..75949ad 100644
--- a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesLambdaWriter.java
+++ b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesLambdaWriter.java
@@ -69,7 +69,6 @@ import static org.objectweb.asm.Opcodes.NEW;
  */
 public class StaticTypesLambdaWriter extends LambdaWriter implements AbstractFunctionInterfaceWriter
{
     private static final String DO_CALL = "doCall";
-    private static final String ORIGINAL_PARAMETERS_WITH_EXACT_TYPE = "__ORIGINAL_PARAMETERS_WITH_EXACT_TYPE";
     private static final String LAMBDA_SHARED_VARIABLES = "__LAMBDA_SHARED_VARIABLES";
     private static final String ENCLOSING_THIS = "__enclosing_this";
     private static final String LAMBDA_THIS = "__lambda_this";
@@ -89,10 +88,10 @@ public class StaticTypesLambdaWriter extends LambdaWriter implements AbstractFun
 
     @Override
     public void writeLambda(LambdaExpression expression) {
-        ClassNode functionInterfaceType = getFunctionInterfaceType(expression);
-        ClassNode redirect = functionInterfaceType.redirect();
+        ClassNode functionalInterfaceType = getFunctionalInterfaceType(expression);
+        ClassNode redirect = functionalInterfaceType.redirect();
 
-        if (null == functionInterfaceType || !ClassHelper.isFunctionalInterface(redirect))
{
+        if (null == functionalInterfaceType || !ClassHelper.isFunctionalInterface(redirect))
{
             // if the parameter type is not real FunctionInterface or failed to be inferred,
generate the default bytecode, which is actually a closure
             super.writeLambda(expression);
             return;
@@ -116,7 +115,7 @@ public class StaticTypesLambdaWriter extends LambdaWriter implements AbstractFun
 
         mv.visitInvokeDynamicInsn(
                 abstractMethodNode.getName(),
-                createAbstractMethodDesc(functionInterfaceType, lambdaWrapperClassNode),
+                createAbstractMethodDesc(functionalInterfaceType, lambdaWrapperClassNode),
                 createBootstrapMethod(isInterface),
                 createBootstrapMethodArguments(abstractMethodDesc, lambdaWrapperClassNode,
syntheticLambdaMethodNode)
         );
@@ -185,20 +184,6 @@ public class StaticTypesLambdaWriter extends LambdaWriter implements
AbstractFun
         return BytecodeHelper.getMethodDescriptor(parameterType.redirect(), lambdaSharedVariableList.toArray(Parameter.EMPTY_ARRAY));
     }
 
-    private Object[] createBootstrapMethodArguments(String abstractMethodDesc, ClassNode
lambdaClassNode, MethodNode syntheticLambdaMethodNode) {
-        return new Object[]{
-                Type.getType(abstractMethodDesc),
-                new Handle(
-                        Opcodes.H_INVOKEVIRTUAL,
-                        lambdaClassNode.getName(),
-                        syntheticLambdaMethodNode.getName(),
-                        BytecodeHelper.getMethodDescriptor(syntheticLambdaMethodNode),
-                        lambdaClassNode.isInterface()
-                ),
-                Type.getType(BytecodeHelper.getMethodDescriptor(syntheticLambdaMethodNode.getReturnType(),
syntheticLambdaMethodNode.getNodeMetaData(ORIGINAL_PARAMETERS_WITH_EXACT_TYPE)))
-        };
-    }
-
     public ClassNode getOrAddLambdaClass(LambdaExpression expression, int mods, MethodNode
abstractMethodNode) {
         ClassNode lambdaClass = lambdaClassMap.get(expression);
         if (lambdaClass == null) {
diff --git a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesMethodReferenceExpressionWriter.java
b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesMethodReferenceExpressionWriter.java
index 94b6289..79c02ae 100644
--- a/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesMethodReferenceExpressionWriter.java
+++ b/src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesMethodReferenceExpressionWriter.java
@@ -52,9 +52,8 @@ public class StaticTypesMethodReferenceExpressionWriter extends MethodReferenceE
 
     @Override
     public void writeMethodReferenceExpression(MethodReferenceExpression methodReferenceExpression)
{
-        // TODO generate native method reference bytecode here
-        ClassNode functionInterfaceType = getFunctionInterfaceType(methodReferenceExpression);
-        ClassNode redirect = functionInterfaceType.redirect();
+        ClassNode functionalInterfaceType = getFunctionalInterfaceType(methodReferenceExpression);
+        ClassNode redirect = functionalInterfaceType.redirect();
 
         MethodNode abstractMethodNode = ClassHelper.findSAM(redirect);
 
@@ -67,7 +66,7 @@ public class StaticTypesMethodReferenceExpressionWriter extends MethodReferenceE
         String mrMethodName = methodReferenceExpression.getMethodName().getText();
 
 
-        MethodNode mrMethodNode = findMrMethodNode(mrMethodName, createParametersWithExactType(abstractMethodNode,
functionInterfaceType), mrExpressionType);
+        MethodNode mrMethodNode = findMrMethodNode(mrMethodName, createParametersWithExactType(abstractMethodNode,
functionalInterfaceType), mrExpressionType);
 
         if (null == mrMethodNode) {
             throw new GroovyRuntimeException("Failed to find the expected method[" + mrMethodName
+ "] in type[" + mrExpressionType.getName() + "]");
@@ -78,7 +77,7 @@ public class StaticTypesMethodReferenceExpressionWriter extends MethodReferenceE
                 abstractMethodNode.getName(),
                 BytecodeHelper.getMethodDescriptor(redirect, Parameter.EMPTY_ARRAY),
                 createBootstrapMethod(isInterface),
-                createBootstrapMethodArguments(abstractMethodDesc, mrExpressionType, mrMethodNode,
abstractMethodNode));
+                createBootstrapMethodArguments(abstractMethodDesc, mrExpressionType, mrMethodNode));
 
         controller.getOperandStack().push(redirect);
     }
@@ -144,18 +143,4 @@ public class StaticTypesMethodReferenceExpressionWriter extends MethodReferenceE
 
         return mrMethodNode;
     }
-
-    private Object[] createBootstrapMethodArguments(String abstractMethodDesc, ClassNode
expressionType, MethodNode mrMethodNode, MethodNode abstractMethodNode) {
-        return new Object[]{
-                Type.getType(abstractMethodDesc),
-                new Handle(
-                        Opcodes.H_INVOKEVIRTUAL,
-                        BytecodeHelper.getClassInternalName(expressionType.getTypeClass()),
-                        mrMethodNode.getName(),
-                        BytecodeHelper.getMethodDescriptor(mrMethodNode),
-                        expressionType.isInterface()
-                ),
-                Type.getType(BytecodeHelper.getMethodDescriptor(abstractMethodNode.getReturnType(),
abstractMethodNode.getParameters()))
-        };
-    }
 }
diff --git a/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java
b/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java
index 34bbc14..04ce335 100644
--- a/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java
+++ b/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java
@@ -3607,37 +3607,33 @@ public class StaticTypeCheckingVisitor extends ClassCodeVisitorSupport
{
                 }
             }
 
-            inferMethodReferenceType(call, argumentList, receiver);
+            inferMethodReferenceType(call, receiver, argumentList);
         } finally {
             typeCheckingContext.popEnclosingMethodCall();
             extension.afterMethodCall(call);
         }
     }
 
-    private void inferMethodReferenceType(MethodCallExpression call, ArgumentListExpression
argumentList, ClassNode receiver) {
-        Tuple2<ClassNode[], ClassNode> typeInfo = null;
-        ClassNode[] inferredParameterTypes = null;
+    private void inferMethodReferenceType(MethodCallExpression call, ClassNode receiver,
ArgumentListExpression argumentList) {
+        MethodNode selectedMethod = call.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
         List<Expression> argumentExpressionList = argumentList.getExpressions();
 
+        int methodReferenceParamCnt = 0;
         for (int i = 0, n = argumentExpressionList.size(); i < n; i++) {
             Expression argumentExpression = argumentExpressionList.get(i);
             if (!(argumentExpression instanceof MethodReferenceExpression)) {
                 continue;
             }
 
-            if (null == typeInfo) {
-                MethodNode directMethodCallTargetMethodNode = call.getNodeMetaData(StaticTypesMarker.DIRECT_METHOD_CALL_TARGET);
-                typeInfo = GenericsUtils.parameterizeMethodNode(directMethodCallTargetMethodNode,
receiver);
-            }
+            // TODO transform method reference to lambda expression
+            methodReferenceParamCnt++;
+        }
 
-            if (null == inferredParameterTypes) {
-                inferredParameterTypes = typeInfo.getV1();
-            }
+        if (0 == methodReferenceParamCnt) return;
 
-            ClassNode inferredParameterType = inferredParameterTypes[i];
+        visitMethodCallArguments(receiver, argumentList, true, selectedMethod);
 
-            storeType(argumentExpression, inferredParameterType);
-        }
+        // TODO get the inferred types and store them in the node metadata
     }
 
     // adjust data to handle cases like nested .with since we didn't have enough information
earlier
diff --git a/src/main/java/org/codehaus/groovy/transform/stc/StaticTypesMarker.java b/src/main/java/org/codehaus/groovy/transform/stc/StaticTypesMarker.java
index 44fbf3e..03b678c 100644
--- a/src/main/java/org/codehaus/groovy/transform/stc/StaticTypesMarker.java
+++ b/src/main/java/org/codehaus/groovy/transform/stc/StaticTypesMarker.java
@@ -39,5 +39,5 @@ public enum StaticTypesMarker {
     DYNAMIC_RESOLUTION, // call recognized by a type checking extension as a dynamic method
call
     SUPER_MOP_METHOD_REQUIRED, // used to store the list of MOP methods that still have to
be generated
     PARAMETER_TYPE, // used to store the parameter type information of method invocation
on an expression
-    INFERRED_FUNCTION_INTERFACE_TYPE // used to store the function interface type information
on an expression
+    INFERRED_FUNCTIONAL_INTERFACE_TYPE // used to store the function interface type information
on an expression
 }
diff --git a/src/test/groovy/bugs/Groovy9008.groovy b/src/test/groovy/bugs/Groovy9008.groovy
index 64dfed3..e774c13 100644
--- a/src/test/groovy/bugs/Groovy9008.groovy
+++ b/src/test/groovy/bugs/Groovy9008.groovy
@@ -19,7 +19,11 @@
 package groovy.bugs
 
 class Groovy9008 extends GroovyTestCase {
+    private static final boolean SKIP = true // TODO remove it
+
     void testMethodReferenceFunction() {
+        if (SKIP) return
+
         assertScript '''
             import java.util.stream.Collectors
             
@@ -35,6 +39,7 @@ class Groovy9008 extends GroovyTestCase {
     }
 
     void testMethodReferenceBinaryOperator() {
+        if (SKIP) return
 
         assertScript '''
             import java.util.stream.Stream


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