/*

 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "ci/ciMethod.hpp"

#include "compiler/compileLog.hpp"

#include "memory/allocation.inline.hpp"

#include "oops/method.hpp"

#include "runtime/mutexLocker.hpp"

#include "runtime/os.hpp"

CompileLog* CompileLog::_first = NULL;

// ------------------------------------------------------------------

// CompileLog::CompileLog

CompileLog::CompileLog(const char* file, FILE* fp, intx thread_id)

  : _context(_context_buffer, sizeof(_context_buffer))

{

  initialize(new(ResourceObj::C_HEAP, mtCompiler) fileStream(fp));

  _file = file;

  _file_end = 0;

  _thread_id = thread_id;

  _identities_limit = 0;

  _identities_capacity = 400;

  _identities = NEW_C_HEAP_ARRAY(char, _identities_capacity, mtCompiler);

  // link into the global list

  { MutexLocker locker(CompileTaskAlloc_lock);

    _next = _first;

    _first = this;

  }

}

CompileLog::~CompileLog() {

  delete _out;

  _out = NULL;

  FREE_C_HEAP_ARRAY(char, _identities, mtCompiler);

}

// Advance kind up to a null or space, return this tail.

// Make sure kind is null-terminated, not space-terminated.

// Use the buffer if necessary.

static const char* split_attrs(const char* &kind, char* buffer) {

  const char* attrs = strchr(kind, ' ');

  // Tease apart the first word from the rest:

  if (attrs == NULL) {

    return "";  // no attrs, no split

  } else if (kind == buffer) {

    ((char*) attrs)[-1] = 0;

    return attrs;

  } else {

    // park it in the buffer, so we can put a null on the end

    assert(!(kind >= buffer && kind < buffer+100), "not obviously in buffer");

    int klen = attrs - kind;

    strncpy(buffer, kind, klen);

    buffer[klen] = 0;

    kind = buffer;  // return by reference

    return attrs;

  }

}

// see_tag, pop_tag:  Override the default do-nothing methods on xmlStream.

// These methods provide a hook for managing the the extra context markup.

void CompileLog::see_tag(const char* tag, bool push) {

  if (_context.size() > 0 && _out != NULL) {

    _out->write(_context.base(), _context.size());

    _context.reset();

  }

  xmlStream::see_tag(tag, push);

}

void CompileLog::pop_tag(const char* tag) {

  _context.reset();  // toss any context info.

  xmlStream::pop_tag(tag);

}

// ------------------------------------------------------------------

// CompileLog::identify

int CompileLog::identify(ciBaseObject* obj) {

  if (obj == NULL)  return 0;

  int id = obj->ident();

  if (id < 0)  return id;

  // If it has already been identified, just return the id.

  if (id < _identities_limit && _identities[id] != 0)  return id;

  // Lengthen the array, if necessary.

  if (id >= _identities_capacity) {

    int new_cap = _identities_capacity * 2;

    if (new_cap <= id)  new_cap = id + 100;

    _identities = REALLOC_C_HEAP_ARRAY(char, _identities, new_cap, mtCompiler);

    _identities_capacity = new_cap;

  }

  while (id >= _identities_limit) {

    _identities[_identities_limit++] = 0;

  }

  assert(id < _identities_limit, "oob");

  // Mark this id as processed.

  // (Be sure to do this before any recursive calls to identify.)

  _identities[id] = 1;  // mark

  // Now, print the object's identity once, in detail.

  if (obj->is_metadata()) {

    ciMetadata* mobj = obj->as_metadata();

    if (mobj->is_klass()) {

      ciKlass* klass = mobj->as_klass();

      begin_elem("klass id='%d'", id);

      name(klass->name());

      if (!klass->is_loaded()) {

        print(" unloaded='1'");

      } else {

        print(" flags='%d'", klass->modifier_flags());

      }

      end_elem();

    } else if (mobj->is_method()) {

      ciMethod* method = mobj->as_method();

      ciSignature* sig = method->signature();

      // Pre-identify items that we will need!

      identify(sig->return_type());

      for (int i = 0; i < sig->count(); i++) {

        identify(sig->type_at(i));

      }

      begin_elem("method id='%d' holder='%d'",

          id, identify(method->holder()));

      name(method->name());

      print(" return='%d'", identify(sig->return_type()));

      if (sig->count() > 0) {

        print(" arguments='");

        for (int i = 0; i < sig->count(); i++) {

          print((i == 0) ? "%d" : " %d", identify(sig->type_at(i)));

        }

        print("'");

      }

      if (!method->is_loaded()) {

        print(" unloaded='1'");

      } else {

        print(" flags='%d'", (jchar) method->flags().as_int());

        // output a few metrics

        print(" bytes='%d'", method->code_size());

        method->log_nmethod_identity(this);

        //print(" count='%d'", method->invocation_count());

        //int bec = method->backedge_count();

        //if (bec != 0)  print(" backedge_count='%d'", bec);

        print(" iicount='%d'", method->interpreter_invocation_count());

      }

      end_elem();

    } else if (mobj->is_type()) {

      BasicType type = mobj->as_type()->basic_type();

      elem("type id='%d' name='%s'", id, type2name(type));

    } else {

      // Should not happen.

      elem("unknown id='%d'", id);

      ShouldNotReachHere();

    }

  } else if (obj->is_symbol()) {

    begin_elem("symbol id='%d'", id);

    name(obj->as_symbol());

    end_elem();

  } else {

    // Should not happen.

    elem("unknown id='%d'", id);

  }

  return id;

}

void CompileLog::name(ciSymbol* name) {

  if (name == NULL)  return;

  print(" name='");

  name->print_symbol_on(text());  // handles quoting conventions

  print("'");

}

// ------------------------------------------------------------------

// CompileLog::clear_identities

// Forget which identities have been printed.

void CompileLog::clear_identities() {

  _identities_limit = 0;

}

// ------------------------------------------------------------------

// CompileLog::finish_log_on_error

//

// Note: This function is called after fatal error, avoid unnecessary memory

// or stack allocation, use only async-safe functions. It's possible JVM is

// only partially initialized.

void CompileLog::finish_log_on_error(outputStream* file, char* buf, int buflen) {

  static bool called_exit = false;

  if (called_exit)  return;

  called_exit = true;

  for (CompileLog* log = _first; log != NULL; log = log->_next) {

    log->flush();

    const char* partial_file = log->file();

    int partial_fd = open(partial_file, O_RDONLY);

    if (partial_fd != -1) {

      // print/print_cr may need to allocate large stack buffer to format

      // strings, here we use snprintf() and print_raw() instead.

      file->print_raw("<compilation_log thread='");

      jio_snprintf(buf, buflen, UINTX_FORMAT, log->thread_id());

      file->print_raw(buf);

      file->print_raw_cr("'>");

      size_t nr; // number read into buf from partial log

      // Copy data up to the end of the last <event> element:

      julong to_read = log->_file_end;

      while (to_read > 0) {

        if (to_read < (julong)buflen)

              nr = (size_t)to_read;

        else  nr = buflen;

        nr = read(partial_fd, buf, (int)nr);

        if (nr <= 0)  break;

        to_read -= (julong)nr;

        file->write(buf, nr);

      }

      // Copy any remaining data inside a quote:

      bool saw_slop = false;

      int end_cdata = 0;  // state machine [0..2] watching for too many "]]"

      while ((nr = read(partial_fd, buf, buflen)) > 0) {

        if (!saw_slop) {

          file->print_raw_cr("<fragment>");

          file->print_raw_cr("<![CDATA[");

          saw_slop = true;

        }

        // The rest of this loop amounts to a simple copy operation:

        // { file->write(buf, nr); }

        // However, it must sometimes output the buffer in parts,

        // in case there is a CDATA quote embedded in the fragment.

        const char* bufp;  // pointer into buf

        size_t nw; // number written in each pass of the following loop:

        for (bufp = buf; nr > 0; nr -= nw, bufp += nw) {

          // Write up to any problematic CDATA delimiter (usually all of nr).

          for (nw = 0; nw < nr; nw++) {

            // First, scan ahead into the buf, checking the state machine.

            switch (bufp[nw]) {

            case ']':

              if (end_cdata < 2)   end_cdata += 1;  // saturating counter

              continue;  // keep scanning

            case '>':

              if (end_cdata == 2)  break;  // found CDATA delimiter!

              // else fall through:

            default:

              end_cdata = 0;

              continue;  // keep scanning

            }

            // If we get here, nw is pointing at a bad '>'.

            // It is very rare for this to happen.

            // However, this code has been tested by introducing

            // CDATA sequences into the compilation log.

            break;

          }

          // Now nw is the number of characters to write, usually == nr.

          file->write(bufp, nw);

          if (nw < nr) {

            // We are about to go around the loop again.

            // But first, disrupt the ]]> by closing and reopening the quote.

            file->print_raw("]]><![CDATA[");

            end_cdata = 0;  // reset state machine

          }

        }

      }

      if (saw_slop) {

        file->print_raw_cr("]]>");

        file->print_raw_cr("</fragment>");

      }

      file->print_raw_cr("</compilation_log>");

      close(partial_fd);

      unlink(partial_file);

    }

  }

}

// ------------------------------------------------------------------

// CompileLog::finish_log

//

// Called during normal shutdown. For now, any clean-up needed in normal

// shutdown is also needed in VM abort, so is covered by finish_log_on_error().

// Just allocate a buffer and call finish_log_on_error().

void CompileLog::finish_log(outputStream* file) {

  char buf[4 * K];

  finish_log_on_error(file, buf, sizeof(buf));

}

// ------------------------------------------------------------------

// CompileLog::inline_success

//

// Print about successful method inlining.

void CompileLog::inline_success(const char* reason) {

  begin_elem("inline_success reason='");

  text(reason);

  end_elem("'");

}

// ------------------------------------------------------------------

// CompileLog::inline_fail

//

// Print about failed method inlining.

void CompileLog::inline_fail(const char* reason) {

  begin_elem("inline_fail reason='");

  text(reason);

  end_elem("'");

}

// ------------------------------------------------------------------

// CompileLog::set_context

//

// Set XML tag as an optional marker - it is printed only if

// there are other entries after until it is reset.

void CompileLog::set_context(const char* format, ...) {

  va_list ap;

  va_start(ap, format);

  clear_context();

  _context.print("<");

  _context.vprint(format, ap);

  _context.print_cr("/>");

  va_end(ap);

}

// ------------------------------------------------------------------

// CompileLog::code_cache_state

//

// Print code cache state.

void CompileLog::code_cache_state() {

  begin_elem("code_cache");

  CodeCache::log_state(this);

  end_elem("");

}