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Trying to share full dir names to save some old gen memory
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105 changes: 105 additions & 0 deletions
105
...ndent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/StringView.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| package io.quarkus.bootstrap.runner; | ||
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| class StringView { | ||
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| private String s; | ||
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| private StringView(String s) { | ||
| this.s = s; | ||
| } | ||
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| private static final class SubStringView extends StringView { | ||
| private final int hash; | ||
| private final int length; | ||
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| private SubStringView(String fullString, int hash, int length) { | ||
| super(fullString); | ||
| this.hash = hash; | ||
| this.length = length; | ||
| } | ||
| } | ||
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| /** | ||
| * In theory the JIT is perfectly capable of performing bimorphic inlining here, if hot enough, but since | ||
| * we expect to run this code while not yet fully warmed up, let's help it a bit by having a single implementation | ||
| */ | ||
| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null) { | ||
| return false; | ||
| } | ||
| if (!(o instanceof StringView otherView)) { | ||
| return false; | ||
| } | ||
| final int length; | ||
| if (this instanceof SubStringView thisSub) { | ||
| length = thisSub.length; | ||
| } else { | ||
| length = s.length(); | ||
| } | ||
| final int otherLength; | ||
| if (o instanceof SubStringView otherSub) { | ||
| otherLength = otherSub.length; | ||
| } else { | ||
| otherLength = otherView.s.length(); | ||
| } | ||
| if (length != otherLength) { | ||
| return false; | ||
| } | ||
| return regionMatches(s, otherView.s, length); | ||
| } | ||
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| private static boolean regionMatches(String a, String b, int length) { | ||
| if (length == a.length() && length == b.length()) { | ||
| return a.equals(b); | ||
| } | ||
| // Intrinsified from https://github.com/openjdk/jdk/commit/861e302011bb3aaf0c8431c121b58a57b78481e3 | ||
| return a.regionMatches(0, b, 0, length); | ||
| } | ||
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| public static final StringView EMPTY = new StringView(""); | ||
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| public static StringView subOf(String s, int hashCode, int length) { | ||
| // we're not performing any specific check at runtime since this is a likely cold path | ||
| // and have to trust the data read from the serialized form | ||
| assert validateView(s, hashCode, length); | ||
| if (length == 0) { | ||
| return EMPTY; | ||
| } | ||
| if (length == s.length()) { | ||
| return new StringView(s); | ||
| } | ||
| if (length > s.length()) { | ||
| throw new IllegalArgumentException("Length must be less than or equal to the full string length"); | ||
| } | ||
| return new SubStringView(s, hashCode, length); | ||
| } | ||
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| private static boolean validateView(String s, int hashCode, int length) { | ||
| if (length < 0) { | ||
| throw new IllegalArgumentException("Length must be positive"); | ||
| } | ||
| if (length > s.length()) { | ||
| throw new IllegalArgumentException("Length must be less than or equal to the full string length"); | ||
| } | ||
| if (s.substring(0, length).hashCode() != hashCode) { | ||
| throw new IllegalArgumentException("Hash code does not match the substring hash code"); | ||
| } | ||
| return true; | ||
| } | ||
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| public static StringView of(String s) { | ||
| return new StringView(s); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| if (this instanceof SubStringView sub) { | ||
| return sub.hash; | ||
| } | ||
| return s.hashCode(); | ||
| } | ||
| } |
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