author | martin |
Tue, 15 Sep 2015 21:56:04 -0700 | |
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parent 27803 | d04ca9d519ce |
child 35252 | 754852fba784 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2013, 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 java.lang.ref.SoftReference; |
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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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final 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 MethodType erasedType; // the canonical erasure |
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final MethodType basicType; // the canonical erasure, with primitives simplified |
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// Cached adapter information: |
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@Stable final SoftReference<MethodHandle>[] methodHandles; |
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// Indexes into methodHandles: |
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static final int |
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MH_BASIC_INV = 0, // cached instance of MH.invokeBasic |
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MH_NF_INV = 1, // cached helper for LF.NamedFunction |
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MH_UNINIT_CS = 2, // uninitialized call site |
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MH_LIMIT = 3; |
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// Cached lambda form information, for basic types only: |
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final @Stable SoftReference<LambdaForm>[] lambdaForms; |
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// Indexes into lambdaForms: |
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static final int |
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LF_INVVIRTUAL = 0, // DMH invokeVirtual |
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LF_INVSTATIC = 1, |
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LF_INVSPECIAL = 2, |
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LF_NEWINVSPECIAL = 3, |
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LF_INVINTERFACE = 4, |
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LF_INVSTATIC_INIT = 5, // DMH invokeStatic with <clinit> barrier |
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LF_INTERPRET = 6, // LF interpreter |
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LF_REBIND = 7, // BoundMethodHandle |
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LF_DELEGATE = 8, // DelegatingMethodHandle |
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LF_DELEGATE_BLOCK_INLINING = 9, // Counting DelegatingMethodHandle w/ @DontInline |
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LF_EX_LINKER = 10, // invokeExact_MT (for invokehandle) |
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LF_EX_INVOKER = 11, // MHs.invokeExact |
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LF_GEN_LINKER = 12, // generic invoke_MT (for invokehandle) |
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LF_GEN_INVOKER = 13, // generic MHs.invoke |
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LF_CS_LINKER = 14, // linkToCallSite_CS |
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LF_MH_LINKER = 15, // linkToCallSite_MH |
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LF_GWC = 16, // guardWithCatch (catchException) |
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LF_GWT = 17, // guardWithTest |
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LF_LIMIT = 18; |
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/** Return the type corresponding uniquely (1-1) to this MT-form. |
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* It might have any primitive returns or arguments, but will have no references except Object. |
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*/ |
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public MethodType erasedType() { |
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return erasedType; |
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} |
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/** Return the basic type derived from the erased type of this MT-form. |
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* A basic type is erased (all references Object) and also has all primitive |
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* types (except int, long, float, double, void) normalized to int. |
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* Such basic types correspond to low-level JVM calling sequences. |
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*/ |
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public MethodType basicType() { |
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return basicType; |
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} |
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private boolean assertIsBasicType() { |
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// primitives must be flattened also |
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assert(erasedType == basicType) |
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: "erasedType: " + erasedType + " != basicType: " + basicType; |
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return true; |
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} |
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public MethodHandle cachedMethodHandle(int which) { |
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assert(assertIsBasicType()); |
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SoftReference<MethodHandle> entry = methodHandles[which]; |
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return (entry != null) ? entry.get() : null; |
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} |
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public synchronized MethodHandle setCachedMethodHandle(int which, MethodHandle mh) { |
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// Simulate a CAS, to avoid racy duplication of results. |
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SoftReference<MethodHandle> entry = methodHandles[which]; |
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if (entry != null) { |
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MethodHandle prev = entry.get(); |
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if (prev != null) { |
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return prev; |
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} |
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} |
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methodHandles[which] = new SoftReference<>(mh); |
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return mh; |
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} |
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public LambdaForm cachedLambdaForm(int which) { |
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assert(assertIsBasicType()); |
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SoftReference<LambdaForm> entry = lambdaForms[which]; |
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return (entry != null) ? entry.get() : null; |
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} |
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public synchronized LambdaForm setCachedLambdaForm(int which, LambdaForm form) { |
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// Simulate a CAS, to avoid racy duplication of results. |
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SoftReference<LambdaForm> entry = lambdaForms[which]; |
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if (entry != null) { |
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LambdaForm prev = entry.get(); |
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if (prev != null) { |
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return prev; |
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} |
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} |
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lambdaForms[which] = new SoftReference<>(form); |
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return form; |
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} |
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145 |
|
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146 |
/** |
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* Build an MTF for a given type, which must have all references erased to Object. |
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* This MTF will stand for that type and all un-erased variations. |
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* Eagerly compute some basic properties of the type, common to all variations. |
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*/ |
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@SuppressWarnings({"rawtypes", "unchecked"}) |
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protected MethodTypeForm(MethodType erasedType) { |
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this.erasedType = erasedType; |
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154 |
|
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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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160 |
|
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int[] argToSlotTab = null, slotToArgTab = null; |
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162 |
|
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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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Class<?>[] bpts = epts; |
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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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++pac; |
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Wrapper w = Wrapper.forPrimitiveType(pt); |
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if (w.isDoubleWord()) ++lac; |
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if (w.isSubwordOrInt() && pt != int.class) { |
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if (bpts == epts) |
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bpts = bpts.clone(); |
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bpts[i] = int.class; |
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} |
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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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Class<?> bt = rt; |
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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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Wrapper w = Wrapper.forPrimitiveType(rt); |
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if (w.isDoubleWord()) ++lrc; |
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if (w.isSubwordOrInt() && rt != int.class) |
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bt = int.class; |
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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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194 |
} |
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if (epts == bpts && bt == rt) { |
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this.basicType = erasedType; |
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} else { |
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this.basicType = MethodType.makeImpl(bt, bpts, true); |
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// fill in rest of data from the basic type: |
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MethodTypeForm that = this.basicType.form(); |
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assert(this != that); |
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this.primCounts = that.primCounts; |
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this.argCounts = that.argCounts; |
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this.argToSlotTable = that.argToSlotTable; |
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this.slotToArgTable = that.slotToArgTable; |
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this.methodHandles = null; |
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this.lambdaForms = null; |
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208 |
return; |
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209 |
} |
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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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Wrapper w = Wrapper.forBasicType(pt); |
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if (w.isDoubleWord()) --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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} else if (pac != 0) { |
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225 |
// have primitives but no long primitives; share slot counts with generic |
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226 |
assert(ptypeCount == pslotCount); |
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MethodTypeForm that = MethodType.genericMethodType(ptypeCount).form(); |
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228 |
assert(this != that); |
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slotToArgTab = that.slotToArgTable; |
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argToSlotTab = that.argToSlotTable; |
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} else { |
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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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241 |
} |
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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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this.argToSlotTable = argToSlotTab; |
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this.slotToArgTable = slotToArgTab; |
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246 |
|
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if (pslotCount >= 256) throw newIllegalArgumentException("too many arguments"); |
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248 |
|
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// Initialize caches, but only for basic types |
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assert(basicType == erasedType); |
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this.lambdaForms = new SoftReference[LF_LIMIT]; |
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this.methodHandles = new SoftReference[MH_LIMIT]; |
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253 |
} |
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254 |
|
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255 |
private static long pack(int a, int b, int c, int d) { |
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256 |
assert(((a|b|c|d) & ~0xFFFF) == 0); |
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257 |
long hw = ((a << 16) | b), lw = ((c << 16) | d); |
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return (hw << 32) | lw; |
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259 |
} |
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260 |
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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263 |
} |
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264 |
|
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265 |
public int parameterCount() { // # outgoing values |
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266 |
return unpack(argCounts, 3); |
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267 |
} |
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268 |
public int parameterSlotCount() { // # outgoing interpreter slots |
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return unpack(argCounts, 2); |
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270 |
} |
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public int returnCount() { // = 0 (V), or 1 |
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272 |
return unpack(argCounts, 1); |
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273 |
} |
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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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276 |
} |
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277 |
public int primitiveParameterCount() { |
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278 |
return unpack(primCounts, 3); |
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279 |
} |
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280 |
public int longPrimitiveParameterCount() { |
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281 |
return unpack(primCounts, 2); |
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282 |
} |
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283 |
public int primitiveReturnCount() { // = 0 (obj), or 1 |
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284 |
return unpack(primCounts, 1); |
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285 |
} |
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286 |
public int longPrimitiveReturnCount() { // = 1 (J/D), or 0 |
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287 |
return unpack(primCounts, 0); |
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288 |
} |
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289 |
public boolean hasPrimitives() { |
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290 |
return primCounts != 0; |
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291 |
} |
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292 |
public boolean hasNonVoidPrimitives() { |
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293 |
if (primCounts == 0) return false; |
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294 |
if (primitiveParameterCount() != 0) return true; |
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295 |
return (primitiveReturnCount() != 0 && returnCount() != 0); |
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296 |
} |
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297 |
public boolean hasLongPrimitives() { |
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298 |
return (longPrimitiveParameterCount() | longPrimitiveReturnCount()) != 0; |
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299 |
} |
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300 |
public int parameterToArgSlot(int i) { |
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301 |
return argToSlotTable[1+i]; |
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302 |
} |
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303 |
public int argSlotToParameter(int argSlot) { |
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304 |
// Note: Empty slots are represented by zero in this table. |
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305 |
// Valid arguments slots contain incremented entries, so as to be non-zero. |
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306 |
// We return -1 the caller to mean an empty slot. |
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307 |
return slotToArgTable[argSlot] - 1; |
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308 |
} |
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309 |
|
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310 |
static MethodTypeForm findForm(MethodType mt) { |
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311 |
MethodType erased = canonicalize(mt, ERASE, ERASE); |
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312 |
if (erased == null) { |
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313 |
// It is already erased. Make a new MethodTypeForm. |
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314 |
return new MethodTypeForm(mt); |
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|
315 |
} else { |
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316 |
// Share the MethodTypeForm with the erased version. |
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317 |
return erased.form(); |
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318 |
} |
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|
319 |
} |
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320 |
|
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321 |
/** Codes for {@link #canonicalize(java.lang.Class, int)}. |
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322 |
* ERASE means change every reference to {@code Object}. |
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323 |
* WRAP means convert primitives (including {@code void} to their |
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324 |
* corresponding wrapper types. UNWRAP means the reverse of WRAP. |
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325 |
* INTS means convert all non-void primitive types to int or long, |
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326 |
* according to size. LONGS means convert all non-void primitives |
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327 |
* to long, regardless of size. RAW_RETURN means convert a type |
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328 |
* (assumed to be a return type) to int if it is smaller than an int, |
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329 |
* or if it is void. |
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|
330 |
*/ |
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|
331 |
public static final int NO_CHANGE = 0, ERASE = 1, WRAP = 2, UNWRAP = 3, INTS = 4, LONGS = 5, RAW_RETURN = 6; |
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|
332 |
|
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333 |
/** Canonicalize the types in the given method type. |
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|
334 |
* If any types change, intern the new type, and return it. |
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|
335 |
* Otherwise return null. |
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|
336 |
*/ |
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|
337 |
public static MethodType canonicalize(MethodType mt, int howRet, int howArgs) { |
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|
338 |
Class<?>[] ptypes = mt.ptypes(); |
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339 |
Class<?>[] ptc = MethodTypeForm.canonicalizeAll(ptypes, howArgs); |
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340 |
Class<?> rtype = mt.returnType(); |
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341 |
Class<?> rtc = MethodTypeForm.canonicalize(rtype, howRet); |
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|
342 |
if (ptc == null && rtc == null) { |
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|
343 |
// It is already canonical. |
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|
344 |
return null; |
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|
345 |
} |
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|
346 |
// Find the erased version of the method type: |
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|
347 |
if (rtc == null) rtc = rtype; |
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|
348 |
if (ptc == null) ptc = ptypes; |
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|
349 |
return MethodType.makeImpl(rtc, ptc, true); |
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|
350 |
} |
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|
351 |
|
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|
352 |
/** Canonicalize the given return or param type. |
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|
353 |
* Return null if the type is already canonicalized. |
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|
354 |
*/ |
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|
355 |
static Class<?> canonicalize(Class<?> t, int how) { |
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|
356 |
Class<?> ct; |
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|
357 |
if (t == Object.class) { |
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|
358 |
// no change, ever |
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|
359 |
} else if (!t.isPrimitive()) { |
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|
360 |
switch (how) { |
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|
361 |
case UNWRAP: |
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|
362 |
ct = Wrapper.asPrimitiveType(t); |
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|
363 |
if (ct != t) return ct; |
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|
364 |
break; |
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|
365 |
case RAW_RETURN: |
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|
366 |
case ERASE: |
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|
367 |
return Object.class; |
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|
368 |
} |
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|
369 |
} else if (t == void.class) { |
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|
370 |
// no change, usually |
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|
371 |
switch (how) { |
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|
372 |
case RAW_RETURN: |
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|
373 |
return int.class; |
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|
374 |
case WRAP: |
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|
375 |
return Void.class; |
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|
376 |
} |
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|
377 |
} else { |
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|
378 |
// non-void primitive |
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|
379 |
switch (how) { |
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|
380 |
case WRAP: |
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|
381 |
return Wrapper.asWrapperType(t); |
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|
382 |
case INTS: |
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|
383 |
if (t == int.class || t == long.class) |
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|
384 |
return null; // no change |
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|
385 |
if (t == double.class) |
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|
386 |
return long.class; |
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|
387 |
return int.class; |
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|
388 |
case LONGS: |
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|
389 |
if (t == long.class) |
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|
390 |
return null; // no change |
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|
391 |
return long.class; |
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|
392 |
case RAW_RETURN: |
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|
393 |
if (t == int.class || t == long.class || |
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|
394 |
t == float.class || t == double.class) |
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|
395 |
return null; // no change |
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|
396 |
// everything else returns as an int |
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changeset
|
397 |
return int.class; |
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changeset
|
398 |
} |
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changeset
|
399 |
} |
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changeset
|
400 |
// no change; return null to signify |
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changeset
|
401 |
return null; |
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changeset
|
402 |
} |
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changeset
|
403 |
|
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changeset
|
404 |
/** Canonicalize each param type in the given array. |
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changeset
|
405 |
* Return null if all types are already canonicalized. |
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*/ |
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static Class<?>[] canonicalizeAll(Class<?>[] ts, int how) { |
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Class<?>[] cs = null; |
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for (int imax = ts.length, i = 0; i < imax; i++) { |
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Class<?> c = canonicalize(ts[i], how); |
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if (c == void.class) |
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c = null; // a Void parameter was unwrapped to void; ignore |
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if (c != null) { |
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if (cs == null) |
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cs = ts.clone(); |
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cs[i] = c; |
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} |
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} |
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return cs; |
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} |
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421 |
|
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@Override |
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public String toString() { |
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return "Form"+erasedType; |
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} |
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} |