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8285932: Implementation of JEP 430 String Templates (Preview)

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Reviewed-by: mcimadamore, rriggs, darcy
This commit is contained in:
Jim Laskey 2023-05-10 11:34:01 +00:00
parent da2c930262
commit 4aa65cbeef
74 changed files with 9309 additions and 99 deletions
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36
src/java.base/share/classes/java/lang/AbstractStringBuilder.java
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@ -1823,6 +1823,42 @@ abstract sealed class AbstractStringBuilder implements Appendable, CharSequence
count += end - off;
}
/**
* Used by StringConcatHelper via JLA. Adds the current builder count to the
* accumulation of items being concatenated. If the coder for the builder is
* UTF16 then upgrade the whole concatenation to UTF16.
*
* @param lengthCoder running accumulation of length and coder
*
* @return updated accumulation of length and coder
*/
long mix(long lengthCoder) {
return (lengthCoder + count) | ((long)coder << 32);
}
/**
* Used by StringConcatHelper via JLA. Adds the characters in the builder value to the
* concatenation buffer and then updates the running accumulation of length.
*
* @param lengthCoder running accumulation of length and coder
* @param buffer concatenation buffer
*
* @return running accumulation of length and coder minus the number of characters added
*/
long prepend(long lengthCoder, byte[] buffer) {
lengthCoder -= count;
if (lengthCoder < ((long)UTF16 << 32)) {
System.arraycopy(value, 0, buffer, (int)lengthCoder, count);
} else if (coder == LATIN1) {
StringUTF16.inflate(value, 0, buffer, (int)lengthCoder, count);
} else {
System.arraycopy(value, 0, buffer, (int)lengthCoder << 1, count << 1);
}
return lengthCoder;
}
private AbstractStringBuilder repeat(char c, int count) {
int limit = this.count + count;
ensureCapacityInternal(limit);