author | never |
Fri, 02 Nov 2018 00:26:25 -0700 | |
changeset 52381 | 7f90bc64b0fc |
parent 47216 | 71c04702a3d5 |
child 54669 | ad45b3802d4e |
permissions | -rw-r--r-- |
43972 | 1 |
/* |
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* Copyright (c) 2009, 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. |
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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 jdk.vm.ci.code; |
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import java.util.Objects; |
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import jdk.vm.ci.meta.ResolvedJavaMethod; |
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/** |
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* Represents a code position, that is, a chain of inlined methods with bytecode locations, that is |
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* communicated from the compiler to the runtime system. A code position can be used by the runtime |
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* system to reconstruct a source-level stack trace for exceptions and to create |
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* {@linkplain BytecodeFrame frames} for deoptimization. |
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*/ |
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public class BytecodePosition { |
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private final BytecodePosition caller; |
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private final ResolvedJavaMethod method; |
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private final int bci; |
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/** |
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* Constructs a new object representing a given parent/caller, a given method, and a given BCI. |
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* |
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* @param caller the parent position |
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* @param method the method |
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52381
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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* @param bci a BCI such that {@code method.codeSize() == 0 || bci < method.getCodeSize()}. That |
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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* is, if code size is 0 then allow any value, otherwise the bci must be less than |
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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* the code size. |
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*/ |
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public BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) { |
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assert method != null; |
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this.caller = caller; |
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this.method = method; |
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this.bci = bci; |
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52381
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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int codeSize = method.getCodeSize(); |
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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if (codeSize != 0 && bci >= codeSize) { |
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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throw new IllegalArgumentException(String.format("bci %d is out of range for %s %d bytes", bci, method.format("%H.%n(%p)"), codeSize)); |
7f90bc64b0fc
8213203: [JVMCI] adopt formatting changes from jvmci 8
never
parents:
47216
diff
changeset
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} |
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} |
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/** |
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* Converts this code position to a string representation. |
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* |
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* @return a string representation of this code position |
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*/ |
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@Override |
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public String toString() { |
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return CodeUtil.append(new StringBuilder(100), this).toString(); |
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} |
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/** |
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* Deep equality test. |
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*/ |
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@Override |
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public boolean equals(Object obj) { |
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if (obj == this) { |
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return true; |
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} |
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if (obj != null && getClass() == obj.getClass()) { |
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BytecodePosition that = (BytecodePosition) obj; |
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if (this.bci == that.bci && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.caller, that.caller)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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@Override |
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public int hashCode() { |
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return getBCI(); |
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} |
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/** |
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* @return The location within the method, as a bytecode index. The constant {@code -1} may be |
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* used to indicate the location is unknown, for example within code synthesized by the |
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* compiler. |
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*/ |
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public int getBCI() { |
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return bci; |
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} |
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/** |
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* @return The runtime interface method for this position. |
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*/ |
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public ResolvedJavaMethod getMethod() { |
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return method; |
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} |
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/** |
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* The position where this position has been called, {@code null} if none. |
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*/ |
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public BytecodePosition getCaller() { |
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return caller; |
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} |
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/** |
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* Adds a caller to the current position returning the new position. |
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*/ |
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public BytecodePosition addCaller(BytecodePosition link) { |
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if (getCaller() == null) { |
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return new BytecodePosition(link, getMethod(), getBCI()); |
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} else { |
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return new BytecodePosition(getCaller().addCaller(link), getMethod(), getBCI()); |
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} |
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} |
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} |