/**
* Copies a region of memory.
*
* @param dst Destination address
* @param src Source address
* @param cnt Number of bytes to copy
*/
public static void memcopy(Address dst, Address src, Extent cnt) {
Address srcEnd = src.plus(cnt);
Address dstEnd = dst.plus(cnt);
boolean overlap = !srcEnd.LE(dst) && !dstEnd.LE(src);
if (overlap) {
SysCall.sysCall.sysMemmove(dst, src, cnt);
} else {
SysCall.sysCall.sysCopy(dst, src, cnt);
}
}
private boolean acquireRecyclableLines(int bytes, int align, int offset) {
while (line < LINES_IN_BLOCK || acquireRecyclableBlock()) {
line = space.getNextAvailableLine(markTable, line);
if (line < LINES_IN_BLOCK) {
int endLine = space.getNextUnavailableLine(markTable, line);
cursor = recyclableBlock.plus(Extent.fromIntSignExtend(line << LOG_BYTES_IN_LINE));
limit = recyclableBlock.plus(Extent.fromIntSignExtend(endLine << LOG_BYTES_IN_LINE));
if (SANITY_CHECK_LINE_MARKS) {
Address tmp = cursor;
while (tmp.LT(limit)) {
if (tmp.loadByte() != (byte) 0) {
Log.write("cursor: ");
Log.writeln(cursor);
Log.write(" limit: ");
Log.writeln(limit);
Log.write("current: ");
Log.write(tmp);
Log.write(" value: ");
Log.write(tmp.loadByte());
Log.write(" line: ");
Log.write(line);
Log.write("endline: ");
Log.write(endLine);
Log.write(" chunk: ");
Log.write(Chunk.align(cursor));
Log.write(" hw: ");
Log.write(Chunk.getHighWater(Chunk.align(cursor)));
Log.writeln(" values: ");
Address tmp2 = cursor;
while (tmp2.LT(limit)) {
Log.write(tmp2.loadByte());
Log.write(" ");
}
Log.writeln();
}
VM.assertions._assert(tmp.loadByte() == (byte) 0);
tmp = tmp.plus(1);
}
}
if (VM.VERIFY_ASSERTIONS && bytes <= BYTES_IN_LINE) {
Address start = alignAllocationNoFill(cursor, align, offset);
Address end = start.plus(bytes);
VM.assertions._assert(end.LE(limit));
}
VM.memory.zero(cursor, limit.diff(cursor).toWord().toExtent());
if (VM.VERIFY_ASSERTIONS && Options.verbose.getValue() >= 9) {
Log.write("Z[");
Log.write(cursor);
Log.write("->");
Log.write(limit);
Log.writeln("]");
}
line = endLine;
if (VM.VERIFY_ASSERTIONS && copy) VM.assertions._assert(!Block.isDefragSource(cursor));
return true;
}
}
return false;
}