1 /*
2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
417 * rewritten to {@code int}.
418 * A linker method is trusted to return a strongly typed result,
419 * according to the specific method type descriptor of the
420 * signature-polymorphic instance it is emulating.
421 * This can involve (as necessary) a dynamic check using
422 * data extracted from the appendix argument.
423 * <p>
424 * The JVM does not inspect the appendix, other than to pass
425 * it verbatim to the linker method at every call.
426 * This means that the JDK runtime has wide latitude
427 * for choosing the shape of each linker method and its
428 * corresponding appendix.
429 * Linker methods should be generated from {@code LambdaForm}s
430 * so that they do not become visible on stack traces.
431 * <p>
432 * The {@code linkMethod} call is free to omit the appendix
433 * (returning null) and instead emulate the required function
434 * completely in the linker method.
435 * As a corner case, if N==255, no appendix is possible.
436 * In this case, the method returned must be custom-generated to
437 * to perform any needed type checking.
438 * <p>
439 * If the JVM does not reify a method at a call site, but instead
440 * calls {@code linkMethod}, the corresponding call represented
441 * in the bytecodes may mention a valid method which is not
442 * representable with a {@code MemberName}.
443 * Therefore, use cases for {@code linkMethod} tend to correspond to
444 * special cases in reflective code such as {@code findVirtual}
445 * or {@code revealDirect}.
446 */
447 static MemberName linkMethod(Class<?> callerClass, int refKind,
448 Class<?> defc, String name, Object type,
449 Object[] appendixResult) {
450 if (!TRACE_METHOD_LINKAGE)
451 return linkMethodImpl(callerClass, refKind, defc, name, type, appendixResult);
452 return linkMethodTracing(callerClass, refKind, defc, name, type, appendixResult);
453 }
454 static MemberName linkMethodImpl(Class<?> callerClass, int refKind,
455 Class<?> defc, String name, Object type,
456 Object[] appendixResult) {
457 try {
|
1 /*
2 * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
417 * rewritten to {@code int}.
418 * A linker method is trusted to return a strongly typed result,
419 * according to the specific method type descriptor of the
420 * signature-polymorphic instance it is emulating.
421 * This can involve (as necessary) a dynamic check using
422 * data extracted from the appendix argument.
423 * <p>
424 * The JVM does not inspect the appendix, other than to pass
425 * it verbatim to the linker method at every call.
426 * This means that the JDK runtime has wide latitude
427 * for choosing the shape of each linker method and its
428 * corresponding appendix.
429 * Linker methods should be generated from {@code LambdaForm}s
430 * so that they do not become visible on stack traces.
431 * <p>
432 * The {@code linkMethod} call is free to omit the appendix
433 * (returning null) and instead emulate the required function
434 * completely in the linker method.
435 * As a corner case, if N==255, no appendix is possible.
436 * In this case, the method returned must be custom-generated to
437 * perform any needed type checking.
438 * <p>
439 * If the JVM does not reify a method at a call site, but instead
440 * calls {@code linkMethod}, the corresponding call represented
441 * in the bytecodes may mention a valid method which is not
442 * representable with a {@code MemberName}.
443 * Therefore, use cases for {@code linkMethod} tend to correspond to
444 * special cases in reflective code such as {@code findVirtual}
445 * or {@code revealDirect}.
446 */
447 static MemberName linkMethod(Class<?> callerClass, int refKind,
448 Class<?> defc, String name, Object type,
449 Object[] appendixResult) {
450 if (!TRACE_METHOD_LINKAGE)
451 return linkMethodImpl(callerClass, refKind, defc, name, type, appendixResult);
452 return linkMethodTracing(callerClass, refKind, defc, name, type, appendixResult);
453 }
454 static MemberName linkMethodImpl(Class<?> callerClass, int refKind,
455 Class<?> defc, String name, Object type,
456 Object[] appendixResult) {
457 try {
|