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Fix for bug 166461 - FileLocation line number computation is very slow

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This commit is contained in:
Anton Leherbauer 2006-12-01 14:26:19 +00:00
parent 6480d32c60
commit 57c1b16f8f
1 changed files with 54 additions and 11 deletions
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65
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner2/LocationMap.java
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@ -8,6 +8,7 @@
* Contributors:
* IBM - Initial API and implementation
* Markus Schorn (Wind River Systems)
* Anton Leherbauer (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.parser.scanner2;
@ -1143,7 +1144,9 @@ public class LocationMap implements ILocationResolver, IScannerPreprocessorLog {
protected static class _CompositeFileContext extends _CompositeContext {
public CodeReader reader;
private int[] lineOffsetCache;
private int numberOfLines;
public _CompositeFileContext(_CompositeContext parent, int startOffset,
int endOffset, CodeReader reader) {
super(parent, startOffset, endOffset);
@ -1155,18 +1158,58 @@ public class LocationMap implements ILocationResolver, IScannerPreprocessorLog {
super(parent, startOffset, endOffset);
}
public int getLineNumber(int nodeOffset) {
if( nodeOffset >= reader.buffer.length )
return 1;
int lineNumber = 1;
for( int i = 0; i < nodeOffset; ++i )
{
if( reader.buffer[i] == '\n')
++lineNumber;
}
return lineNumber;
if( nodeOffset >= reader.buffer.length )
return 1;
if (lineOffsetCache == null) {
createLineOffsetCache();
}
int left= 0;
int right= numberOfLines - 1;
int mid= 0;
while (left < right) {
mid= (left + right) / 2;
int lineOffset= lineOffsetCache[mid];
if (nodeOffset < lineOffset) {
if (left == mid)
right= mid;
else
right= mid - 1;
} else if (nodeOffset > lineOffset) {
if (right == mid)
left= mid;
else
left= mid + 1;
} else if (nodeOffset == lineOffset) {
left= right= mid;
}
}
if (nodeOffset < lineOffsetCache[left])
--left;
return left + 1;
}
private void createLineOffsetCache() {
final char[] buffer= reader.buffer;
int[] lineOffsets= new int[buffer.length / 30 + 1];
int lines= 1;
lineOffsets[0]= 0;
for (int i = 0; i < buffer.length; ++i) {
// TODO consider '\r' line endings?
if (buffer[i] == '\n') {
if (lineOffsets.length == lines) {
final int ratio= Math.min(i / lines, 20);
int[] tmp= new int[lines + (buffer.length - i) / ratio + 1];
System.arraycopy(lineOffsets, 0, tmp, 0, lines);
lineOffsets= tmp;
}
lineOffsets[lines++]= i + 1;
}
}
lineOffsetCache= lineOffsets;
numberOfLines= lines;
}
}
protected static class _Inclusion extends _CompositeFileContext implements