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8185925: StackFrameInfo::walker field can be replaced with bitmap to save footprint

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8153682: StackFrameInfo.declaringClass could be removed

Reviewed-by: coleenp, mchung
This commit is contained in:
Brent Christian 2017-11-09 11:13:50 -08:00
parent 09c2ca5809
commit ac52bdcdd1
8 changed files with 42 additions and 43 deletions
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13
src/java.base/share/classes/java/lang/StackWalker.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2017, 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
@ -296,6 +296,7 @@ public final class StackWalker {
private final Set<Option> options;
private final ExtendedOption extendedOption;
private final int estimateDepth;
final boolean retainClassRef; // cached for performance
/**
* Returns a {@code StackWalker} instance.
@ -412,6 +413,7 @@ public final class StackWalker {
this.options = options;
this.estimateDepth = estimateDepth;
this.extendedOption = extendedOption;
this.retainClassRef = hasOption(Option.RETAIN_CLASS_REFERENCE);
}
private static void checkPermission(Set<Option> options) {
@ -590,7 +592,7 @@ public final class StackWalker {
*/
@CallerSensitive
public Class<?> getCallerClass() {
if (!options.contains(Option.RETAIN_CLASS_REFERENCE)) {
if (!retainClassRef) {
throw new UnsupportedOperationException("This stack walker " +
"does not have RETAIN_CLASS_REFERENCE access");
}
@ -617,11 +619,4 @@ public final class StackWalker {
boolean hasLocalsOperandsOption() {
return extendedOption == ExtendedOption.LOCALS_AND_OPERANDS;
}
void ensureAccessEnabled(Option access) {
if (!hasOption(access)) {
throw new UnsupportedOperationException("No access to " + access +
": " + options.toString());
}
}
}