8141132: JEP 254: Compact Strings
Summary: Adopt a more space-efficient internal representation for strings.
Reviewed-by: alanb, bdelsart, coleenp, iklam, jiangli, jrose, kevinw, naoto, pliden, roland, smarks, twisti
Contributed-by: Brent Christian <brent.christian@oracle.com>, Vivek Deshpande <vivek.r.deshpande@intel.com>, Tobias Hartmann <tobias.hartmann@oracle.com>, Charlie Hunt <charlie.hunt@oracle.com>, Vladimir Kozlov <vladimir.kozlov@oracle.com>, Roger Riggs <roger.riggs@oracle.com>, Xueming Shen <xueming.shen@oracle.com>, Aleksey Shipilev <aleksey.shipilev@oracle.com>, Sandhya Viswanathan <sandhya.viswanathan@intel.com>
/*
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/*
* @test CdsDifferentCompactStrings
* @summary CDS (class data sharing) requires the same -XX:[+-]CompactStrings
* setting between archive creation time and load time.
* @library /testlibrary
* @modules java.base/sun.misc
* java.management
*/
import jdk.test.lib.*;
public class CdsDifferentCompactStrings {
public static void main(String[] args) throws Exception {
createAndLoadSharedArchive("+", "-");
createAndLoadSharedArchive("-", "+");
}
private static void createAndLoadSharedArchive(String create, String load)
throws Exception
{
String createCompactStringsArgument = "-XX:" + create + "CompactStrings";
String loadCompactStringsArgument = "-XX:" + load + "CompactStrings";
String filename = "./CdsDifferentCompactStrings" + create + ".jsa";
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
"-XX:+UnlockDiagnosticVMOptions",
"-XX:SharedArchiveFile=" + filename,
"-Xshare:dump",
createCompactStringsArgument);
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldContain("Loading classes to share");
output.shouldHaveExitValue(0);
pb = ProcessTools.createJavaProcessBuilder(
"-XX:+UnlockDiagnosticVMOptions",
"-XX:SharedArchiveFile=" + filename,
"-Xshare:on",
loadCompactStringsArgument,
"-version");
output = new OutputAnalyzer(pb.start());
try {
output.shouldContain("The shared archive file's CompactStrings " +
"setting .* does not equal the current CompactStrings setting");
} catch (RuntimeException e) {
output.shouldContain("Unable to use shared archive");
}
output.shouldHaveExitValue(1);
}
}