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Bug 565553 - Improve performance of build command parsers with large number of files

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Optimize MSVCBuildCommandParser.unescapeString.
Instead of running a Matcher/replaceAll every time, check first if the
string contains the characters to unescape first. Finding a substring in
a string is much faster than matching a pattern so this saves quite a
bit of time on large MSVC projects since many options will not have the
characters needed to be unescaped.

Change-Id: If2ad7892c29374458d5de446d4492ce3ba576c9c
Signed-off-by: Marc-Andre Laperle <malaperle@gmail.com>
This commit is contained in:
Marc-Andre Laperle 2020-08-16 19:45:38 -04:00 • committed by Marc-André Laperle
parent 68c9b53de0
commit a9b67d0828
1 changed files with 11 additions and 2 deletions
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13
windows/org.eclipse.cdt.msw.build/src/org/eclipse/cdt/msw/build/core/MSVCBuildCommandParser.java
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@ -26,11 +26,20 @@ import org.eclipse.cdt.managedbuilder.language.settings.providers.AbstractBuildC
*/
public class MSVCBuildCommandParser extends AbstractBuildCommandParser implements ILanguageSettingsEditableProvider {
private static final String DOUBLE_BACKSLASH = "\\\\"; //$NON-NLS-1$
private static final Pattern DOUBLE_BACKSLASH_PATTERN = Pattern.compile(Pattern.quote(DOUBLE_BACKSLASH));
private static final String BACKSLASH_REPLACEMENT_STRING = "\\\\"; //$NON-NLS-1$
private static final String BACKSLASH_QUOTE = "\\\""; //$NON-NLS-1$
private static final Pattern BACKSLASH_QUOTE_PATTERN = Pattern.compile(Pattern.quote(BACKSLASH_QUOTE));
private static final String QUOTE_REPLACEMENT_STRING = "\""; //$NON-NLS-1$
private static String unescapeString(String value) {
// There are probably many other things to unescape but these are the most
// common.
value = value.replaceAll("\\\\\\\\", "\\\\"); //$NON-NLS-1$//$NON-NLS-2$
value = value.replaceAll("\\\\\"", "\""); //$NON-NLS-1$ //$NON-NLS-2$
if (value.contains(DOUBLE_BACKSLASH))
value = DOUBLE_BACKSLASH_PATTERN.matcher(value).replaceAll(BACKSLASH_REPLACEMENT_STRING);
if (value.contains(BACKSLASH_QUOTE))
value = BACKSLASH_QUOTE_PATTERN.matcher(value).replaceAll(QUOTE_REPLACEMENT_STRING);
return value;
}