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src/share/vm/logging/logStream.cpp
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rev 13106 : imported patch 8181917-refactor-ul-logstream-alt1-api-changes
rev 13107 : imported patch 8181917-refactor-ul-logstream-alt1-logstream-optimization
@@ -24,17 +24,60 @@
#include "precompiled.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
+LogStream::LineBuffer::LineBuffer()
+ : _buf(_smallbuf), _cap(sizeof(_smallbuf)), _pos(0)
+{
+ _buf[0] = '\0';
+}
+
+LogStream::LineBuffer::~LineBuffer() {
+ assert(_pos == 0, "still outstanding bytes in the line buffer");
+ if (_buf != _smallbuf) {
+ os::free(_buf);
+ }
+}
+
+void LogStream::LineBuffer::ensure_cap(size_t atleast) {
+ assert(_cap >= sizeof(_smallbuf), "sanity");
+ if (_cap < atleast) {
+ const size_t newcap = MAX2(_cap * 2, atleast * 2);
+ char* const newbuf = (char*) os::malloc(newcap, mtLogging);
+ if (_pos > 0) { // preserve old content
+ memcpy(newbuf, _buf, _pos + 1); // ..including trailing zero
+ }
+ if (_buf != _smallbuf) {
+ os::free(_buf);
+ }
+ _buf = newbuf;
+ _cap = newcap;
+ }
+ assert(_cap >= atleast, "sanity");
+}
+
+void LogStream::LineBuffer::append(const char* s, size_t len) {
+ assert(_buf[_pos] == '\0', "sanity");
+ const size_t remaining = _cap - _pos;
+ ensure_cap(remaining + len + 1);
+ memcpy(_buf + _pos, s, len);
+ _pos += len;
+ _buf[_pos] = '\0';
+}
+
+void LogStream::LineBuffer::reset() {
+ _pos = 0;
+ _buf[_pos] = '\0';
+}
+
void LogStream::write(const char* s, size_t len) {
if (len > 0 && s[len - 1] == '\n') {
- _current_line.write(s, len - 1);
- _current_line.write("\0", 1);
- _log_handle.print("%s", _current_line.base());
+ _current_line.append(s, len - 1); // omit the newline.
+ _log_handle.print("%s", _current_line.ptr());
_current_line.reset();
} else {
- _current_line.write(s, len);
+ _current_line.append(s, len);
}
update_position(s, len);
}
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