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Comment:Optimized path name lookup
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SHA3-256: c1c3fa70b5c7d0ea86acb9b8db5229fc8965d926ef4cec73f23ee8e251554629
User & Date: rkeene on 2019-09-17 21:35:39.089
Other Links: manifest | tags
Context
2019-09-17
21:39
Cause a negative threshold to be really high check-in: 3c48891a32 user: rkeene tags: trunk
21:35
Optimized path name lookup check-in: c1c3fa70b5 user: rkeene tags: trunk
20:43
Fixed issue where coverage files were not cleaned up and ignored check-in: 2f92a3a715 user: rkeene tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
Modified xvfs.c.rvt from [015931e23f] to [60bb9bc295].
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		const unsigned char *fileContents;
		const char          **dirChildren;
	} data;
};

<?
	package require xvfs





	xvfs::main $argv










?>
static long xvfs_<?= $::xvfs::fsName ?>_nameToIndex(const char *path) {


















	unsigned int pathHash;
	size_t pathLen;
	
	if (path == NULL) {
		return(XVFS_NAME_LOOKUP_ERROR);
	}

	pathLen = strlen(path);
	pathHash = Tcl_ZlibAdler32(0, (const unsigned char *) path, pathLen);
	switch (pathHash) {
<?
	for {set index 0} {$index < [llength $::xvfs::outputFiles]} {incr index} {
		set outputFile [lindex $::xvfs::outputFiles $index]
		set outputFileHash [zlib adler32 $outputFile 0]
		lappend outputFileHashToIndex($outputFileHash) $index
	}
	
	foreach {outputFileHash outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileHashToIndex]] {
?>		case <?= $outputFileHash ?>:
<?
			foreach outputFileIndex $outputFileIndexes {



				set outputFileName [lindex $::xvfs::outputFiles $outputFileIndex]
				set outputFileNameLen [string length $outputFileName]
?>			if (pathLen == <?= $outputFileNameLen ?> && memcmp(path, xvfs_<?= $::xvfs::fsName ?>_data[<?= $outputFileIndex ?>].name, pathLen) == 0) {

				return(<?= $outputFileIndex ?>);


			}

<?


			}
?>			break;
<?	} ?>
	}
	
	return(XVFS_NAME_LOOKUP_ERROR);
}

static const char **xvfs_<?= $::xvfs::fsName ?>_getChildren(const char *path, Tcl_WideInt *count) {
	struct xvfs_file_data *fileInfo;
	long inode;








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		const unsigned char *fileContents;
		const char          **dirChildren;
	} data;
};

<?
	package require xvfs

	set ::xvfs::hashNameThreshold 3
	if {[info exists ::env(XVFS_CREATE_HASH_NAME_THRESHOLD)]} {
		set ::xvfs::hashNameThreshold $::env(XVFS_CREATE_HASH_NAME_THRESHOLD)
	}
	xvfs::main $argv

	proc emitFilenameVerification {indentLevel outputFileNameLen outputFileIndexes} {
		set indent [string repeat "\t" $indentLevel]
		foreach outputFileIndex $outputFileIndexes {
?><?= $indent ?>if (memcmp(path, xvfs_<?= $::xvfs::fsName ?>_data[<?= $outputFileIndex ?>].name, <?= $outputFileNameLen ?>) == 0) {
<?= $indent ?>	return(<?= $outputFileIndex ?>);
<?= $indent ?>}
<?
		}
	}
?>
static long xvfs_<?= $::xvfs::fsName ?>_nameToIndex(const char *path) {
<?
	for {set index 0} {$index < [llength $::xvfs::outputFiles]} {incr index} {
		set outputFileName [lindex $::xvfs::outputFiles $index]
		set outputFileNameLen [string length $outputFileName]
		set outputFileNameHash [zlib adler32 $outputFileName 0]
		lappend outputFileNameHashToIndex([list $outputFileNameLen $outputFileNameHash]) $index
		lappend outputFileNameLenToIndex($outputFileNameLen) $index
	}

	set needZlib false
	foreach {outputFileNameLen outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameLenToIndex]] {
		if {[llength $outputFileIndexes] > $::xvfs::hashNameThreshold} {
			set needZlib true
			break;
		}
	}
?><?
	if {$needZlib} {
?>	unsigned int pathHash;
<?	} ?>	size_t pathLen;
	
	if (path == NULL) {
		return(XVFS_NAME_LOOKUP_ERROR);
	}

	pathLen = strlen(path);

	switch (pathLen) {
<?






	foreach {outputFileNameLen outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameLenToIndex]] {
?>		case <?= $outputFileNameLen ?>:
<?
			if {[llength $outputFileIndexes] > $::xvfs::hashNameThreshold} {
?>			pathHash = Tcl_ZlibAdler32(0, (const unsigned char *) path, <?= $outputFileNameLen ?>);
			switch (pathHash) {
<?
				foreach {key outputFileIndexes} [lsort -stride 2 -dictionary [array get outputFileNameHashToIndex [list $outputFileNameLen *]]] {
					set outputFileNameHash [lindex $key 1]
?>				case <?= $outputFileNameHash ?>:
<?
					emitFilenameVerification 5 $outputFileNameLen $outputFileIndexes
?>					break;	
<?
				}
?>			}
<?
			} else {
				emitFilenameVerification 3 $outputFileNameLen $outputFileIndexes
			}
?>			break;
<?	} ?>	}

	
	return(XVFS_NAME_LOOKUP_ERROR);
}

static const char **xvfs_<?= $::xvfs::fsName ?>_getChildren(const char *path, Tcl_WideInt *count) {
	struct xvfs_file_data *fileInfo;
	long inode;
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