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<?php
/**
* Class for preprocessing callgrind files.
*
* Information from the callgrind file is extracted and written in a binary format for
* fast random access.
*
* @see http://code.google.com/p/webgrind/wiki/PreprocessedFormat
* @see http://valgrind.org/docs/manual/cl-format.html
* @package Webgrind
* @author Jacob Oettinger
**/
class Webgrind_Preprocessor
{

/**
* Fileformat version. Embedded in the output for parsers to use.
*/
const FILE_FORMAT_VERSION = 7;

/**
* Binary number format used.
* @see http://php.net/pack
*/
const NR_FORMAT = 'V';

/**
* Size, in bytes, of the above number format
*/
const NR_SIZE = 4;

/**
* String name of main function
*/
const ENTRY_POINT = '{main}';


/**
* Extract information from $inFile and store in preprocessed form in $outFile
*
* @param string $inFile Callgrind file to read
* @param string $outFile File to write preprocessed data to
* @return void
**/
static function parse($inFile, $outFile)
{
$in = @fopen($inFile, 'rb');
if(!$in)
throw new Exception('Could not open '.$inFile.' for reading.');
$out = @fopen($outFile, 'w+b');
if(!$out)
throw new Exception('Could not open '.$outFile.' for writing.');

$nextFuncNr = 0;
$functions = array();
$headers = array();
$calls = array();


// Read information into memory
while(($line = fgets($in))){
if(substr($line,0,3)==='fl='){
// Found invocation of function. Read functionname
list($function) = fscanf($in,"fn=%[^\n\r]s");
if(!isset($functions[$function])){
$functions[$function] = array(
                        'filename' => substr(trim($line),3),
                        'invocationCount' => 0,
                        'nr' => $nextFuncNr++,
                        'count' => 0,
                        'summedSelfCost' => 0,
                        'summedInclusiveCost' => 0,
                        'calledFromInformation' => array(),
                        'subCallInformation' => array()
);
}
$functions[$function]['invocationCount']++;
// Special case for ENTRY_POINT - it contains summary header
if(self::ENTRY_POINT == $function){
fgets($in);
$headers[] = fgets($in);
fgets($in);
}
// Cost line
list($lnr, $cost) = fscanf($in,"%d %d");
$functions[$function]['line'] = $lnr;
$functions[$function]['summedSelfCost'] += $cost;
$functions[$function]['summedInclusiveCost'] += $cost;
} else if(substr($line,0,4)==='cfn=') {

// Found call to function. ($function should contain function call originates from)
$calledFunctionName = substr(trim($line),4);
// Skip call line
fgets($in);
// Cost line
list($lnr, $cost) = fscanf($in,"%d %d");

$functions[$function]['summedInclusiveCost'] += $cost;

if(!isset($functions[$calledFunctionName]['calledFromInformation'][$function.':'.$lnr]))
$functions[$calledFunctionName]['calledFromInformation'][$function.':'.$lnr] = array('functionNr'=>$functions[$function]['nr'],'line'=>$lnr,'callCount'=>0,'summedCallCost'=>0);

$functions[$calledFunctionName]['calledFromInformation'][$function.':'.$lnr]['callCount']++;
$functions[$calledFunctionName]['calledFromInformation'][$function.':'.$lnr]['summedCallCost'] += $cost;

if(!isset($functions[$function]['subCallInformation'][$calledFunctionName.':'.$lnr])){
$functions[$function]['subCallInformation'][$calledFunctionName.':'.$lnr] = array('functionNr'=>$functions[$calledFunctionName]['nr'],'line'=>$lnr,'callCount'=>0,'summedCallCost'=>0);
}

$functions[$function]['subCallInformation'][$calledFunctionName.':'.$lnr]['callCount']++;
$functions[$function]['subCallInformation'][$calledFunctionName.':'.$lnr]['summedCallCost'] += $cost;


} else if(strpos($line,': ')!==false){
// Found header
$headers[] = $line;
}
}


// Write output
$functionCount = sizeof($functions);
fwrite($out, pack(self::NR_FORMAT.'*', self::FILE_FORMAT_VERSION, 0, $functionCount));
// Make room for function addresses
fseek($out,self::NR_SIZE*$functionCount, SEEK_CUR);
$functionAddresses = array();
foreach($functions as $functionName => $function){
$functionAddresses[] = ftell($out);
$calledFromCount = sizeof($function['calledFromInformation']);
$subCallCount = sizeof($function['subCallInformation']);
fwrite($out, pack(self::NR_FORMAT.'*', $function['line'], $function['summedSelfCost'], $function['summedInclusiveCost'], $function['invocationCount'], $calledFromCount, $subCallCount));
// Write called from information
foreach((array)$function['calledFromInformation'] as $call){
fwrite($out, pack(self::NR_FORMAT.'*', $call['functionNr'], $call['line'], $call['callCount'], $call['summedCallCost']));
}
// Write sub call information
foreach((array)$function['subCallInformation'] as $call){
fwrite($out, pack(self::NR_FORMAT.'*', $call['functionNr'], $call['line'], $call['callCount'], $call['summedCallCost']));
}

fwrite($out, $function['filename']."\n".$functionName."\n");
}
$headersPos = ftell($out);
// Write headers
foreach($headers as $header){
fwrite($out,$header);
}

// Write addresses
fseek($out,self::NR_SIZE, SEEK_SET);
fwrite($out, pack(self::NR_FORMAT, $headersPos));
// Skip function count
fseek($out,self::NR_SIZE, SEEK_CUR);
// Write function addresses
foreach($functionAddresses as $address){
fwrite($out, pack(self::NR_FORMAT, $address));
}

}

}
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