author | sherman |
Tue, 30 Aug 2011 11:53:11 -0700 | |
changeset 10419 | 12c063b39232 |
parent 10082 | 761643c9bebd |
child 13423 | 17843fff200d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.lang.invoke; |
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import sun.invoke.util.Wrapper; |
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import static java.lang.invoke.MethodHandleStatics.*; |
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/** |
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* Shared information for a group of method types, which differ |
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* only by reference types, and therefore share a common erasure |
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* and wrapping. |
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* <p> |
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* For an empirical discussion of the structure of method types, |
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* see <a href="http://groups.google.com/group/jvm-languages/browse_thread/thread/ac9308ae74da9b7e/"> |
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* the thread "Avoiding Boxing" on jvm-languages</a>. |
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* There are approximately 2000 distinct erased method types in the JDK. |
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* There are a little over 10 times that number of unerased types. |
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* No more than half of these are likely to be loaded at once. |
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* @author John Rose |
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*/ |
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class MethodTypeForm { |
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final int[] argToSlotTable, slotToArgTable; |
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final long argCounts; // packed slot & value counts |
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final long primCounts; // packed prim & double counts |
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final int vmslots; // total number of parameter slots |
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private Object vmlayout; // vm-specific information for calls |
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final MethodType erasedType; // the canonical erasure |
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/*lazy*/ MethodType primsAsBoxes; // replace prims by wrappers |
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/*lazy*/ MethodType primArgsAsBoxes; // wrap args only; make raw return |
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/*lazy*/ MethodType primsAsInts; // replace prims by int/long |
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/*lazy*/ MethodType primsAsLongs; // replace prims by long |
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/*lazy*/ MethodType primsAtEnd; // reorder primitives to the end |
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// Cached adapter information: |
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/*lazy*/ MethodHandle genericInvoker; // hook for inexact invoke |
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public MethodType erasedType() { |
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return erasedType; |
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} |
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protected MethodTypeForm(MethodType erasedType) { |
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this.erasedType = erasedType; |
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Class<?>[] ptypes = erasedType.ptypes(); |
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int ptypeCount = ptypes.length; |
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int pslotCount = ptypeCount; // temp. estimate |
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int rtypeCount = 1; // temp. estimate |
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int rslotCount = 1; // temp. estimate |
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int[] argToSlotTab = null, slotToArgTab = null; |
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// Walk the argument types, looking for primitives. |
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int pac = 0, lac = 0, prc = 0, lrc = 0; |
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Class<?> epts[] = ptypes; |
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for (int i = 0; i < epts.length; i++) { |
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Class<?> pt = epts[i]; |
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if (pt != Object.class) { |
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assert(pt.isPrimitive()); |
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++pac; |
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if (hasTwoArgSlots(pt)) ++lac; |
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} |
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} |
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pslotCount += lac; // #slots = #args + #longs |
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Class<?> rt = erasedType.returnType(); |
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if (rt != Object.class) { |
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++prc; // even void.class counts as a prim here |
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if (hasTwoArgSlots(rt)) ++lrc; |
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// adjust #slots, #args |
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if (rt == void.class) |
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rtypeCount = rslotCount = 0; |
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else |
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rslotCount += lrc; |
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} |
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if (lac != 0) { |
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int slot = ptypeCount + lac; |
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slotToArgTab = new int[slot+1]; |
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argToSlotTab = new int[1+ptypeCount]; |
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argToSlotTab[0] = slot; // argument "-1" is past end of slots |
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for (int i = 0; i < epts.length; i++) { |
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Class<?> pt = epts[i]; |
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if (hasTwoArgSlots(pt)) --slot; |
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--slot; |
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slotToArgTab[slot] = i+1; // "+1" see argSlotToParameter note |
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argToSlotTab[1+i] = slot; |
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} |
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assert(slot == 0); // filled the table |
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} |
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this.primCounts = pack(lrc, prc, lac, pac); |
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this.argCounts = pack(rslotCount, rtypeCount, pslotCount, ptypeCount); |
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if (slotToArgTab == null) { |
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int slot = ptypeCount; // first arg is deepest in stack |
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slotToArgTab = new int[slot+1]; |
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argToSlotTab = new int[1+ptypeCount]; |
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argToSlotTab[0] = slot; // argument "-1" is past end of slots |
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for (int i = 0; i < ptypeCount; i++) { |
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--slot; |
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slotToArgTab[slot] = i+1; // "+1" see argSlotToParameter note |
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argToSlotTab[1+i] = slot; |
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} |
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} |
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this.argToSlotTable = argToSlotTab; |
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this.slotToArgTable = slotToArgTab; |
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if (pslotCount >= 256) throw newIllegalArgumentException("too many arguments"); |
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// send a few bits down to the JVM: |
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this.vmslots = parameterSlotCount(); |
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// short circuit some no-op canonicalizations: |
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if (!hasPrimitives()) { |
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primsAsBoxes = erasedType; |
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primArgsAsBoxes = erasedType; |
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primsAsInts = erasedType; |
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primsAsLongs = erasedType; |
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primsAtEnd = erasedType; |
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} |
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} |
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|
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/** Turn all primitive types to corresponding wrapper types. |
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*/ |
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public MethodType primsAsBoxes() { |
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MethodType ct = primsAsBoxes; |
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if (ct != null) return ct; |
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MethodType t = erasedType; |
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ct = canonicalize(erasedType, WRAP, WRAP); |
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if (ct == null) ct = t; // no prims to box |
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return primsAsBoxes = ct; |
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} |
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153 |
|
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/** Turn all primitive argument types to corresponding wrapper types. |
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* Subword and void return types are promoted to int. |
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*/ |
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public MethodType primArgsAsBoxes() { |
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MethodType ct = primArgsAsBoxes; |
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if (ct != null) return ct; |
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MethodType t = erasedType; |
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ct = canonicalize(erasedType, RAW_RETURN, WRAP); |
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if (ct == null) ct = t; // no prims to box |
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return primArgsAsBoxes = ct; |
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} |
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165 |
|
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/** Turn all primitive types to either int or long. |
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* Floating point return types are not changed, because |
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* they may require special calling sequences. |
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* A void return value is turned to int. |
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*/ |
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public MethodType primsAsInts() { |
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MethodType ct = primsAsInts; |
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if (ct != null) return ct; |
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MethodType t = erasedType; |
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ct = canonicalize(t, RAW_RETURN, INTS); |
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if (ct == null) ct = t; // no prims to int-ify |
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return primsAsInts = ct; |
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} |
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|
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/** Turn all primitive types to either int or long. |
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* Floating point return types are not changed, because |
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* they may require special calling sequences. |
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* A void return value is turned to int. |
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*/ |
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public MethodType primsAsLongs() { |
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MethodType ct = primsAsLongs; |
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if (ct != null) return ct; |
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MethodType t = erasedType; |
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ct = canonicalize(t, RAW_RETURN, LONGS); |
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if (ct == null) ct = t; // no prims to int-ify |
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return primsAsLongs = ct; |
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} |
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|
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/** Stably sort parameters into 3 buckets: ref, int, long. */ |
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public MethodType primsAtEnd() { |
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MethodType ct = primsAtEnd; |
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if (ct != null) return ct; |
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MethodType t = erasedType; |
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199 |
|
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int pac = primitiveParameterCount(); |
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if (pac == 0) |
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return primsAtEnd = t; |
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203 |
|
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int argc = parameterCount(); |
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int lac = longPrimitiveParameterCount(); |
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if (pac == argc && (lac == 0 || lac == argc)) |
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return primsAtEnd = t; |
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208 |
|
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// known to have a mix of 2 or 3 of ref, int, long |
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int[] reorder = primsAtEndOrder(t); |
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ct = reorderParameters(t, reorder, null); |
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//System.out.println("t="+t+" / reorder="+java.util.Arrays.toString(reorder)+" => "+ct); |
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return primsAtEnd = ct; |
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} |
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|
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/** Compute a new ordering of parameters so that all references |
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* are before all ints or longs, and all ints are before all longs. |
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* For this ordering, doubles count as longs, and all other primitive |
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* values count as ints. |
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* As a special case, if the parameters are already in the specified |
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* order, this method returns a null reference, rather than an array |
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* specifying a null permutation. |
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* <p> |
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* For example, the type {@code (int,boolean,int,Object,String)void} |
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* produces the order {@code {3,4,0,1,2}}, the type |
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* {@code (long,int,String)void} produces {@code {2,1,2}}, and |
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* the type {@code (Object,int)Object} produces {@code null}. |
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*/ |
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public static int[] primsAtEndOrder(MethodType mt) { |
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MethodTypeForm form = mt.form(); |
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if (form.primsAtEnd == form.erasedType) |
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// quick check shows no reordering is necessary |
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return null; |
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234 |
|
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int argc = form.parameterCount(); |
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int[] paramOrder = new int[argc]; |
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|
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// 3-way bucket sort: |
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int pac = form.primitiveParameterCount(); |
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int lac = form.longPrimitiveParameterCount(); |
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int rfill = 0, ifill = argc - pac, lfill = argc - lac; |
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242 |
|
8821
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Class<?>[] ptypes = mt.ptypes(); |
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boolean changed = false; |
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for (int i = 0; i < ptypes.length; i++) { |
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Class<?> pt = ptypes[i]; |
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int ord; |
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if (!pt.isPrimitive()) ord = rfill++; |
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else if (!hasTwoArgSlots(pt)) ord = ifill++; |
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else ord = lfill++; |
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if (ord != i) changed = true; |
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assert(paramOrder[ord] == 0); |
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paramOrder[ord] = i; |
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254 |
} |
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assert(rfill == argc - pac && ifill == argc - lac && lfill == argc); |
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if (!changed) { |
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form.primsAtEnd = form.erasedType; |
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return null; |
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} |
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return paramOrder; |
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} |
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262 |
|
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/** Put the existing parameters of mt into a new order, given by newParamOrder. |
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* The third argument is logically appended to mt.parameterArray, |
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* so that elements of newParamOrder can index either pre-existing or |
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* new parameter types. |
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*/ |
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public static MethodType reorderParameters(MethodType mt, int[] newParamOrder, Class<?>[] moreParams) { |
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if (newParamOrder == null) return mt; // no-op reordering |
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Class<?>[] ptypes = mt.ptypes(); |
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Class<?>[] ntypes = new Class<?>[newParamOrder.length]; |
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int maxParam = ptypes.length + (moreParams == null ? 0 : moreParams.length); |
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boolean changed = (ntypes.length != ptypes.length); |
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274 |
for (int i = 0; i < newParamOrder.length; i++) { |
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int param = newParamOrder[i]; |
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if (param != i) changed = true; |
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277 |
Class<?> nt; |
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if (param < ptypes.length) nt = ptypes[param]; |
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else if (param == maxParam) nt = mt.returnType(); |
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else nt = moreParams[param - ptypes.length]; |
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ntypes[i] = nt; |
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282 |
} |
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if (!changed) return mt; |
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return MethodType.makeImpl(mt.returnType(), ntypes, true); |
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285 |
} |
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286 |
|
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private static boolean hasTwoArgSlots(Class<?> type) { |
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return type == long.class || type == double.class; |
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289 |
} |
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290 |
|
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private static long pack(int a, int b, int c, int d) { |
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assert(((a|b|c|d) & ~0xFFFF) == 0); |
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long hw = ((a << 16) | b), lw = ((c << 16) | d); |
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return (hw << 32) | lw; |
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295 |
} |
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private static char unpack(long packed, int word) { // word==0 => return a, ==3 => return d |
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assert(word <= 3); |
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return (char)(packed >> ((3-word) * 16)); |
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299 |
} |
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300 |
|
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public int parameterCount() { // # outgoing values |
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return unpack(argCounts, 3); |
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303 |
} |
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public int parameterSlotCount() { // # outgoing interpreter slots |
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return unpack(argCounts, 2); |
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306 |
} |
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public int returnCount() { // = 0 (V), or 1 |
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308 |
return unpack(argCounts, 1); |
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309 |
} |
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public int returnSlotCount() { // = 0 (V), 2 (J/D), or 1 |
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return unpack(argCounts, 0); |
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312 |
} |
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public int primitiveParameterCount() { |
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return unpack(primCounts, 3); |
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315 |
} |
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316 |
public int longPrimitiveParameterCount() { |
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return unpack(primCounts, 2); |
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318 |
} |
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public int primitiveReturnCount() { // = 0 (obj), or 1 |
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return unpack(primCounts, 1); |
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321 |
} |
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public int longPrimitiveReturnCount() { // = 1 (J/D), or 0 |
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return unpack(primCounts, 0); |
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324 |
} |
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325 |
public boolean hasPrimitives() { |
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326 |
return primCounts != 0; |
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327 |
} |
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328 |
// public boolean hasNonVoidPrimitives() { |
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329 |
// if (primCounts == 0) return false; |
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330 |
// if (primitiveParameterCount() != 0) return true; |
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// return (primitiveReturnCount() != 0 && returnCount() != 0); |
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332 |
// } |
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333 |
public boolean hasLongPrimitives() { |
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334 |
return (longPrimitiveParameterCount() | longPrimitiveReturnCount()) != 0; |
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335 |
} |
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336 |
public int parameterToArgSlot(int i) { |
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337 |
return argToSlotTable[1+i]; |
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338 |
} |
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339 |
public int argSlotToParameter(int argSlot) { |
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340 |
// Note: Empty slots are represented by zero in this table. |
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341 |
// Valid arguments slots contain incremented entries, so as to be non-zero. |
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342 |
// We return -1 the caller to mean an empty slot. |
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343 |
return slotToArgTable[argSlot] - 1; |
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344 |
} |
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345 |
|
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346 |
static MethodTypeForm findForm(MethodType mt) { |
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347 |
MethodType erased = canonicalize(mt, ERASE, ERASE); |
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348 |
if (erased == null) { |
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349 |
// It is already erased. Make a new MethodTypeForm. |
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350 |
return new MethodTypeForm(mt); |
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351 |
} else { |
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352 |
// Share the MethodTypeForm with the erased version. |
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353 |
return erased.form(); |
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354 |
} |
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355 |
} |
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356 |
|
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357 |
/** Codes for {@link #canonicalize(java.lang.Class, int)}. |
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358 |
* ERASE means change every reference to {@code Object}. |
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359 |
* WRAP means convert primitives (including {@code void} to their |
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360 |
* corresponding wrapper types. UNWRAP means the reverse of WRAP. |
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361 |
* INTS means convert all non-void primitive types to int or long, |
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362 |
* according to size. LONGS means convert all non-void primitives |
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363 |
* to long, regardless of size. RAW_RETURN means convert a type |
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364 |
* (assumed to be a return type) to int if it is smaller than an int, |
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365 |
* or if it is void. |
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366 |
*/ |
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367 |
public static final int NO_CHANGE = 0, ERASE = 1, WRAP = 2, UNWRAP = 3, INTS = 4, LONGS = 5, RAW_RETURN = 6; |
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|
368 |
|
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369 |
/** Canonicalize the types in the given method type. |
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370 |
* If any types change, intern the new type, and return it. |
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|
371 |
* Otherwise return null. |
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|
372 |
*/ |
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373 |
public static MethodType canonicalize(MethodType mt, int howRet, int howArgs) { |
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374 |
Class<?>[] ptypes = mt.ptypes(); |
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375 |
Class<?>[] ptc = MethodTypeForm.canonicalizes(ptypes, howArgs); |
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376 |
Class<?> rtype = mt.returnType(); |
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377 |
Class<?> rtc = MethodTypeForm.canonicalize(rtype, howRet); |
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|
378 |
if (ptc == null && rtc == null) { |
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|
379 |
// It is already canonical. |
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|
380 |
return null; |
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|
381 |
} |
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|
382 |
// Find the erased version of the method type: |
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|
383 |
if (rtc == null) rtc = rtype; |
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|
384 |
if (ptc == null) ptc = ptypes; |
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|
385 |
return MethodType.makeImpl(rtc, ptc, true); |
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|
386 |
} |
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|
387 |
|
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|
388 |
/** Canonicalize the given return or param type. |
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|
389 |
* Return null if the type is already canonicalized. |
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|
390 |
*/ |
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|
391 |
static Class<?> canonicalize(Class<?> t, int how) { |
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|
392 |
Class<?> ct; |
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|
393 |
if (t == Object.class) { |
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|
394 |
// no change, ever |
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|
395 |
} else if (!t.isPrimitive()) { |
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|
396 |
switch (how) { |
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|
397 |
case UNWRAP: |
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|
398 |
ct = Wrapper.asPrimitiveType(t); |
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|
399 |
if (ct != t) return ct; |
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|
400 |
break; |
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|
401 |
case RAW_RETURN: |
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|
402 |
case ERASE: |
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|
403 |
return Object.class; |
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|
404 |
} |
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|
405 |
} else if (t == void.class) { |
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6839872: remove implementation inheritance from JSR 292 APIs
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|
406 |
// no change, usually |
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changeset
|
407 |
switch (how) { |
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|
408 |
case RAW_RETURN: |
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|
409 |
return int.class; |
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changeset
|
410 |
case WRAP: |
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changeset
|
411 |
return Void.class; |
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6839872: remove implementation inheritance from JSR 292 APIs
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diff
changeset
|
412 |
} |
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changeset
|
413 |
} else { |
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changeset
|
414 |
// non-void primitive |
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changeset
|
415 |
switch (how) { |
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changeset
|
416 |
case WRAP: |
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|
417 |
return Wrapper.asWrapperType(t); |
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|
418 |
case INTS: |
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changeset
|
419 |
if (t == int.class || t == long.class) |
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6839872: remove implementation inheritance from JSR 292 APIs
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changeset
|
420 |
return null; // no change |
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changeset
|
421 |
if (t == double.class) |
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changeset
|
422 |
return long.class; |
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changeset
|
423 |
return int.class; |
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changeset
|
424 |
case LONGS: |
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changeset
|
425 |
if (t == long.class) |
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changeset
|
426 |
return null; // no change |
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changeset
|
427 |
return long.class; |
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changeset
|
428 |
case RAW_RETURN: |
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changeset
|
429 |
if (t == int.class || t == long.class || |
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changeset
|
430 |
t == float.class || t == double.class) |
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diff
changeset
|
431 |
return null; // no change |
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diff
changeset
|
432 |
// everything else returns as an int |
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diff
changeset
|
433 |
return int.class; |
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parents:
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diff
changeset
|
434 |
} |
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parents:
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diff
changeset
|
435 |
} |
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diff
changeset
|
436 |
// no change; return null to signify |
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parents:
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diff
changeset
|
437 |
return null; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
438 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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diff
changeset
|
439 |
|
2836ee97ee27
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diff
changeset
|
440 |
/** Canonicalize each param type in the given array. |
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changeset
|
441 |
* Return null if all types are already canonicalized. |
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diff
changeset
|
442 |
*/ |
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changeset
|
443 |
static Class<?>[] canonicalizes(Class<?>[] ts, int how) { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
444 |
Class<?>[] cs = null; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
445 |
for (int imax = ts.length, i = 0; i < imax; i++) { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
446 |
Class<?> c = canonicalize(ts[i], how); |
9731
d0f7a3e441c4
7044892: JSR 292: API entry points sometimes throw the wrong exceptions or doesn't throw the expected one
jrose
parents:
9646
diff
changeset
|
447 |
if (c == void.class) |
d0f7a3e441c4
7044892: JSR 292: API entry points sometimes throw the wrong exceptions or doesn't throw the expected one
jrose
parents:
9646
diff
changeset
|
448 |
c = null; // a Void parameter was unwrapped to void; ignore |
8821
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
449 |
if (c != null) { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
450 |
if (cs == null) |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
451 |
cs = ts.clone(); |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
452 |
cs[i] = c; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
453 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
454 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
455 |
return cs; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
456 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
457 |
|
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
458 |
/*non-public*/ void notifyGenericMethodType() { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
459 |
if (genericInvoker != null) return; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
460 |
try { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
5506
diff
changeset
|
461 |
// Trigger adapter creation. |
9645
dabb5e4edc4c
7034977: JSR 292 MethodHandle.invokeGeneric should be renamed MethodHandle.invoke
jrose
parents:
8822
diff
changeset
|
462 |
genericInvoker = InvokeGeneric.generalInvokerOf(erasedType); |
8821
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
463 |
} catch (Exception ex) { |
10419
12c063b39232
7084245: Update usages of InternalError to use exception chaining
sherman
parents:
10082
diff
changeset
|
464 |
Error err = new InternalError("Exception while resolving inexact invoke", ex); |
8821
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
465 |
err.initCause(ex); |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
466 |
throw err; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
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diff
changeset
|
467 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
468 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
469 |
|
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
470 |
@Override |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
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diff
changeset
|
471 |
public String toString() { |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
472 |
return "Form"+erasedType; |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
jrose
parents:
5506
diff
changeset
|
473 |
} |
2836ee97ee27
6839872: remove implementation inheritance from JSR 292 APIs
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parents:
5506
diff
changeset
|
474 |
|
2707
5a17df307cbc
6829144: JSR 292 JVM features need a provisional Java API
jrose
parents:
diff
changeset
|
475 |
} |