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src/java.base/share/classes/jdk/internal/classfile/impl/AttributeHelpers.java
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/* | ||
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. Oracle designates this | ||
* particular file as subject to the "Classpath" exception as provided | ||
* by Oracle in the LICENSE file that accompanied this code. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
package jdk.internal.classfile.impl; | ||
|
||
import jdk.internal.classfile.BufWriter; | ||
import jdk.internal.classfile.Label; | ||
import jdk.internal.classfile.constantpool.Utf8Entry; | ||
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/** | ||
* Utilities for writing logic shared for attributes that are streamable. | ||
*/ | ||
public final class AttributeHelpers { | ||
private AttributeHelpers() { | ||
} | ||
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public static boolean writeLocalVariable(LabelContext lc, BufWriter b, Label start, Label end, | ||
Utf8Entry name, Utf8Entry type, int slot) { | ||
int startBci = lc.labelToBci(start); | ||
int endBci = lc.labelToBci(end); | ||
if (startBci == -1 || endBci == -1) { | ||
return false; | ||
} | ||
writeLocalVariableInfo(b, startBci, endBci - startBci, name, type, slot); | ||
return true; | ||
} | ||
|
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public static void writeLocalVariableInfo(BufWriter b, int startPc, int length, | ||
Utf8Entry name, Utf8Entry type, int slot) { | ||
b.writeU2(startPc); | ||
b.writeU2(length); | ||
b.writeIndex(name); | ||
b.writeIndex(type); | ||
b.writeU2(slot); | ||
} | ||
} | ||
/* | ||
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. Oracle designates this | ||
* particular file as subject to the "Classpath" exception as provided | ||
* by Oracle in the LICENSE file that accompanied this code. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
package jdk.internal.classfile.impl; | ||
|
||
import jdk.internal.classfile.BufWriter; | ||
import jdk.internal.classfile.Label; | ||
import jdk.internal.classfile.constantpool.Utf8Entry; | ||
|
||
/** | ||
* Utilities for writing logic shared for attributes that are streamable. | ||
*/ | ||
public final class AttributeHelpers { | ||
private AttributeHelpers() { | ||
} | ||
|
||
public static boolean writeLocalVariable(LabelContext lc, BufWriter b, Label start, Label end, | ||
Utf8Entry name, Utf8Entry type, int slot) { | ||
int startBci = lc.labelToBci(start); | ||
int endBci = lc.labelToBci(end); | ||
if (startBci == -1 || endBci == -1) { | ||
return false; | ||
} | ||
writeLocalVariableInfo(b, startBci, endBci - startBci, name, type, slot); | ||
return true; | ||
} | ||
|
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public static void writeLocalVariableInfo(BufWriter b, int startPc, int length, | ||
Utf8Entry name, Utf8Entry type, int slot) { | ||
b.writeU2(startPc); | ||
b.writeU2(length); | ||
b.writeIndex(name); | ||
b.writeIndex(type); | ||
b.writeU2(slot); | ||
} | ||
} |
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