8253725: Jextract fails to extract big monolithic headers

Reviewed-by: jvernee

src/jdk.incubator.jextract/share/classes/jdk/internal/jextract/impl/ClassConstantHelper.java

@@ -151,7 +151,7 @@ public ClassConstantHelper(ClassWriter cw, ClassDesc CD_constantsHelper, String
     }
 
     public static ConstantHelper make(String packageName, String className, ClassDesc runtimeHelper, ClassDesc cString,
-                                      String[] libraryNames, String baseClassName, boolean isFinal) {
+                                      String[] libraryNames, String baseClassName) {
         String qualName = Utils.qualifiedClassName(packageName, className);
         String qualBaseName = baseClassName != null ? Utils.qualifiedClassName(packageName, baseClassName) : null;
         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
@@ -195,18 +195,17 @@ public static ConstantHelper make(String packageName, String className, ClassDes
 
         ClassConstantHelper helper = new ClassConstantHelper(cw, CD_constantsHelper, internalClassName,
                 MH_downcallHandle, MH_lookupGlobalVariable, MH_makeCString, LIBRARIES);
-        helper.classBegin(qualBaseName, isFinal);
+        helper.classBegin(qualBaseName);
         return helper;
     }
 
     private static String toInternalName(String className) {
         return className.replace('.', '/');
     }
 
-    private void classBegin(String baseClassName, boolean isFinal) {
+    private void classBegin(String baseClassName) {
         String baseName = baseClassName != null ? toInternalName(baseClassName) : INTR_OBJECT;
-        int mods = isFinal? ACC_FINAL : 0;
-        cw.visit(V15, mods, internalClassName, null, baseName, null);
+        cw.visit(V15, 0, internalClassName, null, baseName, null);
     }
 
     private static DirectMethodHandleDesc findRuntimeHelperBootstrap(ClassDesc runtimeHelper, String name, MethodType type) {
@@ -289,7 +288,7 @@ public DirectMethodHandleDesc addConstant(String name, Class<?> type, Object val
     }
 
     @Override
-    public List<JavaFileObject> getClasses() {
+    public List<JavaFileObject> build() {
         cw.visitEnd();
         byte[] bytes = cw.toByteArray();
         cw = null;

src/jdk.incubator.jextract/share/classes/jdk/internal/jextract/impl/ConstantHelper.java

@@ -44,14 +44,18 @@ interface ConstantHelper {
     DirectMethodHandleDesc addSegment(String javaName, String nativeName, MemoryLayout layout);
     DirectMethodHandleDesc addFunctionDesc(String javaName, FunctionDescriptor fDesc);
     DirectMethodHandleDesc addConstant(String name, Class<?> type, Object value);
-    List<JavaFileObject> getClasses();
+    List<JavaFileObject> build();
 
     static ConstantHelper make(boolean source, String packageName, String headerClassName, ClassDesc runtimeHelper,
                                ClassDesc cString, String[] libraryNames) {
         return new MultiFileConstantHelper(headerClassName,
             (simpleClassName, baseClassName, isFinal) -> source
-                ? SourceConstantHelper.make(packageName, simpleClassName, libraryNames, baseClassName, isFinal)
-                : ClassConstantHelper.make(packageName, simpleClassName, runtimeHelper, cString, libraryNames, baseClassName, isFinal),
+                ? SourceConstantHelper.make(packageName, simpleClassName, libraryNames, baseClassName)
+                : ClassConstantHelper.make(packageName, simpleClassName, runtimeHelper, cString, libraryNames, baseClassName),
             source ? CONSTANTS_PER_CLASS_SOURCES : CONSTANTS_PER_CLASS_CLASSES);
     }
+
+    interface ConstantHelperFactory {
+        ConstantHelper make(String headerClassName);
+    }
 }

src/jdk.incubator.jextract/share/classes/jdk/internal/jextract/impl/FunctionalInterfaceBuilder.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.internal.jextract.impl;
+
+import jdk.incubator.foreign.*;
+import jdk.incubator.jextract.Type;
+
+import java.lang.invoke.MethodType;
+
+public class FunctionalInterfaceBuilder extends NestedClassBuilder {
+
+    private final String fiAnno;
+    private final MethodType fiType;
+    private final FunctionDescriptor fiDesc;
+
+    FunctionalInterfaceBuilder(JavaSourceBuilder enclosing, String className, MethodType fiType,
+                               FunctionDescriptor fiDesc, Type funcType) {
+        super(enclosing, Kind.INTERFACE, className);
+        this.fiType = fiType;
+        this.fiDesc = fiDesc;
+        this.fiAnno = annotationWriter.getCAnnotation(funcType);
+    }
+
+    @Override
+    JavaSourceBuilder classEnd() {
+        emitFunctionalInterfaceMethod();
+        emitFunctionalFactories();
+        return super.classEnd();
+    }
+
+    void emitFunctionalInterfaceMethod() {
+        builder.incrAlign();
+        builder.indent();
+        builder.append(fiType.returnType().getName() + " apply(");
+        String delim = "";
+        for (int i = 0 ; i < fiType.parameterCount(); i++) {
+            builder.append(delim + fiType.parameterType(i).getName() + " x" + i);
+            delim = ", ";
+        }
+        builder.append(");\n");
+        builder.decrAlign();
+    }
+
+    private void emitFunctionalFactories() {
+        builder.incrAlign();
+        builder.indent();
+        builder.append(PUB_MODS + " " + fiAnno + " MemorySegment allocate(" + className + " fi) {\n");
+        builder.incrAlign();
+        builder.indent();
+        builder.append("return RuntimeHelper.upcallStub(" + className + ".class, fi, " + functionGetCallString(className, fiDesc) + ", " +
+                "\"" + fiType.toMethodDescriptorString() + "\");\n");
+        builder.decrAlign();
+        builder.indent();
+        builder.append("}\n");
+        builder.indent();
+        builder.append(PUB_MODS + " " + fiAnno + " MemorySegment allocate(" + className + " fi, NativeScope scope) {\n");
+        builder.incrAlign();
+        builder.indent();
+        builder.append("return scope.register(allocate(fi));\n");
+        builder.decrAlign();
+        builder.indent();
+        builder.append("}\n");
+        builder.decrAlign();
+    }
+}