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/*! @file TraceReaderLogQEMU.cc
* @brief TraceReaderLogQEMU Implementation
*
* This file contains the implementation of the functions supporting
* reading the QEMU coverage data files.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <string.h>
#include "qemu-log.h"
#include "app_common.h"
#include "TraceReaderBase.h"
#include "TraceReaderLogQEMU.h"
#include "TraceList.h"
/* XXX really not always right */
typedef uint32_t target_ulong;
#include "qemu-traces.h"
/* hack so this can compile on old Linux versions and FreeBSD */
#if (__GNUC__ <= 2) || defined(__FreeBSD__)
#define STAT stat
#define OPEN fopen
#else
#define STAT stat64
#define OPEN fopen64
#endif
namespace Trace {
TraceReaderLogQEMU::TraceReaderLogQEMU()
{
}
TraceReaderLogQEMU::~TraceReaderLogQEMU()
{
}
bool TraceReaderLogQEMU::processFile(
const char* const file
)
{
bool done = false;
QEMU_LOG_IN_Block_t first = { 0, "", "" };
QEMU_LOG_IN_Block_t last = { 0, "", "" };
QEMU_LOG_IN_Block_t nextExecuted = { 0, "", "" };
uint32_t nextlogical;
struct STAT statbuf;
int status;
FILE* logFile;
int result;
//
// Verify that the log file has a non-zero size.
//
// NOTE: We prefer stat64 because some of the coverage files are HUGE!
status = STAT( file, &statbuf );
if (status == -1) {
fprintf( stderr, "Unable to stat %s\n", file );
return false;
}
if (statbuf.st_size == 0) {
fprintf( stderr, "%s is 0 bytes long\n", file );
return false;
}
//
// Open the coverage file and discard the header.
//
logFile = OPEN( file, "r" );
if (!logFile) {
fprintf( stderr, "Unable to open %s\n", file );
return false;
}
//
// Discard Header section
//
if (! ReadUntilFound( logFile, QEMU_LOG_SECTION_END ) ) {
fprintf( stderr, "Unable to locate end of log file header\n" );
return false;
}
//
// Find first IN block
//
if (! ReadUntilFound( logFile, QEMU_LOG_IN_KEY )){
fprintf(stderr,"Error: Unable to locate first IN: Block in Log file \n");
return false;
}
//
// Read First Start Address
//
fgets(inputBuffer, MAX_LINE_LENGTH, logFile );
result = sscanf(
inputBuffer,
"0x%08lx: %s %s\n",
&first.address,
first.instruction,
first.data
);
if ( result < 2 )
{
fprintf(stderr, "Error Unable to Read Initial First Block\n" );
done = true;
}
while (!done) {
last = first;
// Read until we get to the last instruction in the block.
do {
fgets(inputBuffer, MAX_LINE_LENGTH, logFile );
result = sscanf(
inputBuffer,
"0x%08lx: %s %s\n",
&last.address,
last.instruction,
last.data
);
} while( result > 1);
nextlogical = objdumpProcessor->getAddressAfter(last.address);
if (! ReadUntilFound( logFile, QEMU_LOG_IN_KEY )) {
done = true;
nextExecuted = last;
} else {
fgets(inputBuffer, MAX_LINE_LENGTH, logFile );
result = sscanf(
inputBuffer,
"0x%08lx: %s %s\n",
&nextExecuted.address,
nextExecuted.instruction,
nextExecuted.data
);
if ( result < 2 )
{
fprintf(stderr, "Error Unable to Read First Block\n" );
}
}
// If the nextlogical was not found we are throwing away
// the block; otherwise add the block to the trace list.
if (nextlogical != 0) {
TraceList::exitReason_t reason = TraceList::EXIT_REASON_OTHER;
if ( objdumpProcessor->IsBranch( last.instruction ) ) {
if ( nextExecuted.address == nextlogical ) {
reason = TraceList::EXIT_REASON_BRANCH_NOT_TAKEN;
} else {
reason = TraceList::EXIT_REASON_BRANCH_TAKEN;
}
}
Trace.add( first.address, nextlogical, reason );
}
first = nextExecuted;
}
fclose( logFile );
return true;
}
}
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