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xmlstream.cpp 
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/*
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 * Copyright (c) 2002, 2023, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "code/nmethod.hpp"
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#include "memory/allocation.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/methodData.hpp"
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#include "oops/method.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/vmOperations.hpp"
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#include "runtime/vmThread.hpp"
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#include "utilities/vmError.hpp"
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#include "utilities/xmlstream.hpp"
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// Do not assert this condition if there's already another error reported.
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#define assert_if_no_error(cond, msg) \
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  vmassert((cond) || VMError::is_error_reported(), msg)
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void xmlStream::initialize(outputStream* out) {
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  _out = out;
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  _last_flush = 0;
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  _markup_state = BODY;
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  _text_init._outer_xmlStream = this;
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  _text = &_text_init;
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#ifdef ASSERT
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  _element_depth = 0;
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  int   init_len = 100;
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  char* init_buf = NEW_C_HEAP_ARRAY(char, init_len, mtInternal);
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  _element_close_stack_low  = init_buf;
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  _element_close_stack_high = init_buf + init_len;
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  _element_close_stack_ptr  = init_buf + init_len - 1;
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  _element_close_stack_ptr[0] = '\0';
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#endif
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  // Make sure each log uses the same base for time stamps.
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  if (is_open()) {
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    _out->time_stamp().update_to(1);
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  }
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}
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#ifdef ASSERT
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xmlStream::~xmlStream() {
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  FREE_C_HEAP_ARRAY(char, _element_close_stack_low);
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}
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#endif
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// Pass the given chars directly to _out.
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void xmlStream::write(const char* s, size_t len) {
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  if (!is_open())  return;
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  out()->write(s, len);
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  update_position(s, len);
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}
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// Pass the given chars directly to _out, except that
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// we watch for special "<&>" chars.
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// This is suitable for either attribute text or for body text.
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// We don't fool with "<![CDATA[" quotes, just single-character entities.
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// This makes it easier for dumb tools to parse the output.
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void xmlStream::write_text(const char* s, size_t len) {
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  if (!is_open())  return;
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  size_t written = 0;
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  // All normally printed material goes inside XML quotes.
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  // This leaves the output free to include markup also.
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  // Scan the string looking for inadvertent "<&>" chars
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  for (size_t i = 0; i < len; i++) {
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    char ch = s[i];
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    // Escape special chars.
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    const char* esc = nullptr;
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    switch (ch) {
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      // These are important only in attrs, but we do them always:
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    case '\'': esc = "&apos;"; break;
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    case '"':  esc = "&quot;"; break;
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    case '<':  esc = "&lt;";   break;
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    case '&':  esc = "&amp;";  break;
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      // This is a freebie.
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    case '>':  esc = "&gt;";   break;
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    }
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    if (esc != nullptr) {
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      if (written < i) {
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        out()->write(&s[written], i - written);
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        written = i;
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      }
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      out()->print_raw(esc);
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      written++;
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    }
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  }
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  // Print the clean remainder.  Usually, it is all of s.
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  if (written < len) {
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    out()->write(&s[written], len - written);
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  }
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}
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// ------------------------------------------------------------------
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// Outputs XML text, with special characters quoted.
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void xmlStream::text(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_text(format, ap);
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  va_end(ap);
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}
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#define BUFLEN 2*K   /* max size of output of individual print methods */
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// ------------------------------------------------------------------
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void xmlStream::va_tag(bool push, const char* format, va_list ap) {
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  assert_if_no_error(!inside_attrs(), "cannot print tag inside attrs");
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  char buffer[BUFLEN];
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  size_t len;
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  const char* kind = do_vsnprintf(buffer, BUFLEN, format, ap, false, len);
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  see_tag(kind, push);
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  print_raw("<");
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  write(kind, len);
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  _markup_state = (push ? HEAD : ELEM);
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}
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#ifdef ASSERT
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/// Debugging goo to make sure element tags nest properly.
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// ------------------------------------------------------------------
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void xmlStream::see_tag(const char* tag, bool push) {
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  assert_if_no_error(!inside_attrs(), "cannot start new element inside attrs");
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  if (!push)  return;
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  // tag goes up until either null or space:
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  const char* tag_end = strchr(tag, ' ');
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  size_t tag_len = (tag_end == nullptr) ? strlen(tag) : tag_end - tag;
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  assert(tag_len > 0, "tag must not be empty");
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  // push the tag onto the stack, pulling down the pointer
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  char* old_ptr  = _element_close_stack_ptr;
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  char* old_low  = _element_close_stack_low;
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  char* push_ptr = old_ptr - (tag_len+1);
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  if (push_ptr < old_low) {
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    int old_len = pointer_delta_as_int(_element_close_stack_high, old_ptr);
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    int new_len = old_len * 2;
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    if (new_len < 100)  new_len = 100;
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    char* new_low  = NEW_C_HEAP_ARRAY(char, new_len, mtInternal);
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    char* new_high = new_low + new_len;
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    char* new_ptr  = new_high - old_len;
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    memcpy(new_ptr, old_ptr, old_len);
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    _element_close_stack_high = new_high;
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    _element_close_stack_low  = new_low;
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    _element_close_stack_ptr  = new_ptr;
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    FREE_C_HEAP_ARRAY(char, old_low);
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    push_ptr = new_ptr - (tag_len+1);
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  }
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  assert(push_ptr >= _element_close_stack_low, "in range");
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  memcpy(push_ptr, tag, tag_len);
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  push_ptr[tag_len] = 0;
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  _element_close_stack_ptr = push_ptr;
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  _element_depth += 1;
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}
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// ------------------------------------------------------------------
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void xmlStream::pop_tag(const char* tag) {
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  assert_if_no_error(!inside_attrs(), "cannot close element inside attrs");
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  assert(_element_depth > 0, "must be in an element to close");
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  assert(*tag != 0, "tag must not be empty");
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  char* cur_tag = _element_close_stack_ptr;
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  bool  bad_tag = false;
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  while (*cur_tag != 0 && strcmp(cur_tag, tag) != 0) {
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    this->print_cr("</%s> <!-- missing closing tag -->", cur_tag);
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    _element_close_stack_ptr = (cur_tag += strlen(cur_tag) + 1);
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    _element_depth -= 1;
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    bad_tag = true;
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  }
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  if (*cur_tag == 0) {
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    bad_tag = true;
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  } else {
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    // Pop the stack, by skipping over the tag and its null.
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    _element_close_stack_ptr = cur_tag + strlen(cur_tag) + 1;
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    _element_depth -= 1;
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  }
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  if (bad_tag && !VMThread::should_terminate() && !VM_Exit::vm_exited() &&
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      !VMError::is_error_reported())
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  {
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    assert(false, "bad tag in log");
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  }
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}
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#endif
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// ------------------------------------------------------------------
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// First word in formatted string is element kind, and any subsequent
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// words must be XML attributes.  Outputs "<kind .../>".
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void xmlStream::elem(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_elem(format, ap);
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  va_end(ap);
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}
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// ------------------------------------------------------------------
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void xmlStream::va_elem(const char* format, va_list ap) {
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  va_begin_elem(format, ap);
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  end_elem();
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}
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// ------------------------------------------------------------------
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// First word in formatted string is element kind, and any subsequent
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// words must be XML attributes.  Outputs "<kind ...", not including "/>".
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void xmlStream::begin_elem(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_tag(false, format, ap);
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  va_end(ap);
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}
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// ------------------------------------------------------------------
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void xmlStream::va_begin_elem(const char* format, va_list ap) {
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  va_tag(false, format, ap);
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}
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// ------------------------------------------------------------------
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// Outputs "/>".
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void xmlStream::end_elem() {
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  assert(_markup_state == ELEM, "misplaced end_elem");
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  print_raw("/>\n");
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  _markup_state = BODY;
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}
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// ------------------------------------------------------------------
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// Outputs formatted text, followed by "/>".
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void xmlStream::end_elem(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  out()->vprint(format, ap);
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  va_end(ap);
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  end_elem();
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}
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// ------------------------------------------------------------------
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// First word in formatted string is element kind, and any subsequent
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// words must be XML attributes.  Outputs "<kind ...>".
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void xmlStream::head(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_head(format, ap);
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  va_end(ap);
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}
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// ------------------------------------------------------------------
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void xmlStream::va_head(const char* format, va_list ap) {
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  va_begin_head(format, ap);
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  end_head();
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}
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// ------------------------------------------------------------------
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// First word in formatted string is element kind, and any subsequent
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// words must be XML attributes.  Outputs "<kind ...", not including ">".
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void xmlStream::begin_head(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_tag(true, format, ap);
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  va_end(ap);
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}
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// ------------------------------------------------------------------
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void xmlStream::va_begin_head(const char* format, va_list ap) {
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  va_tag(true, format, ap);
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}
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// ------------------------------------------------------------------
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// Outputs ">".
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void xmlStream::end_head() {
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  assert(_markup_state == HEAD, "misplaced end_head");
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  print_raw(">\n");
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  _markup_state = BODY;
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}
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// ------------------------------------------------------------------
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// Outputs formatted text, followed by ">".
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void xmlStream::end_head(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  out()->vprint(format, ap);
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  va_end(ap);
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  end_head();
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}
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// ------------------------------------------------------------------
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// Outputs "</kind>".
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void xmlStream::tail(const char* kind) {
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  pop_tag(kind);
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  print_raw("</");
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  print_raw(kind);
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  print_raw(">\n");
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}
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// ------------------------------------------------------------------
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// Outputs "<kind_done ... stamp='D.DD'/> </kind>".
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void xmlStream::done(const char* format, ...) {
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  va_list ap;
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  va_start(ap, format);
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  va_done(format, ap);
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  va_end(ap);
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}
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// ------------------------------------------------------------------
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// Outputs "<kind_done stamp='D.DD'/> </kind>".
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// Because done_raw() doesn't need to format strings, it's simpler than
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// done(), and can be called safely by fatal error handler.
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void xmlStream::done_raw(const char* kind) {
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  print_raw("<");
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  print_raw(kind);
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  print_raw("_done stamp='");
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  out()->stamp();
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  print_raw_cr("'/>");
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  print_raw("</");
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  print_raw(kind);
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  print_raw_cr(">");
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}
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// If you remove the PRAGMA, this fails to compile with clang-503.0.40.
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PRAGMA_DIAG_PUSH
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PRAGMA_FORMAT_NONLITERAL_IGNORED
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// ------------------------------------------------------------------
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void xmlStream::va_done(const char* format, va_list ap) {
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  char buffer[200];
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  size_t format_len = strlen(format);
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  guarantee(format_len + 10 < sizeof(buffer), "bigger format buffer");
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  const char* kind = format;
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  const char* kind_end = strchr(kind, ' ');
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  size_t kind_len;
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  if (kind_end != nullptr) {
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    kind_len = kind_end - kind;
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    int n = os::snprintf(buffer, sizeof(buffer), "%.*s_done%s", (int)kind_len, kind, kind + kind_len);
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    assert((size_t)n < sizeof(buffer), "Unexpected number of characters in string");
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  } else {
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    kind_len = format_len;
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    int n = os::snprintf(buffer, sizeof(buffer), "%s_done", kind);
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    assert((size_t)n < sizeof(buffer), "Unexpected number of characters in string");
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  }
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  // Output the trailing event with the timestamp.
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  va_begin_elem(buffer, ap);
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  stamp();
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  end_elem();
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  // Output the tail-tag of the enclosing element.
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  buffer[kind_len] = 0;
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  tail(buffer);
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}
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PRAGMA_DIAG_POP
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377
// Output a timestamp attribute.
378
void xmlStream::stamp() {
379
  assert_if_no_error(inside_attrs(), "stamp must be an attribute");
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  print_raw(" stamp='");
381
  out()->stamp();
382
  print_raw("'");
383
}
384

385

386
// ------------------------------------------------------------------
387
// Output a method attribute, in the form " method='pkg/cls name sig'".
388
// This is used only when there is no ciMethod available.
389
void xmlStream::method(Method* method) {
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  assert_if_no_error(inside_attrs(), "printing attributes");
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  if (method == nullptr)  return;
392
  print_raw(" method='");
393
  method_text(method);
394
  print("' bytes='%d'", method->code_size());
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  print(" count='%d'", method->invocation_count());
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  int bec = method->backedge_count();
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  if (bec != 0)  print(" backedge_count='%d'", bec);
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  print(" iicount='%d'", method->interpreter_invocation_count());
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  int throwouts = method->interpreter_throwout_count();
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  if (throwouts != 0)  print(" throwouts='%d'", throwouts);
401
  MethodData* mdo = method->method_data();
402
  if (mdo != nullptr) {
403
    uint cnt;
404
    cnt = mdo->decompile_count();
405
    if (cnt != 0)  print(" decompiles='%d'", cnt);
406
    for (uint reason = 0; reason < mdo->trap_reason_limit(); reason++) {
407
      cnt = mdo->trap_count(reason);
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      if (cnt != 0)  print(" %s_traps='%d'", Deoptimization::trap_reason_name(reason), cnt);
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    }
410
    cnt = mdo->overflow_trap_count();
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    if (cnt != 0)  print(" overflow_traps='%d'", cnt);
412
    cnt = mdo->overflow_recompile_count();
413
    if (cnt != 0)  print(" overflow_recompiles='%d'", cnt);
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  }
415
}
416

417
void xmlStream::method_text(Method* method) {
418
  ResourceMark rm;
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  assert_if_no_error(inside_attrs(), "printing attributes");
420
  if (method == nullptr)  return;
421
  text()->print("%s", method->method_holder()->external_name());
422
  print_raw(" ");  // " " is easier for tools to parse than "::"
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  method->name()->print_symbol_on(text());
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  print_raw(" ");  // separator
425
  method->signature()->print_symbol_on(text());
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}
427

428

429
// ------------------------------------------------------------------
430
// Output a klass attribute, in the form " klass='pkg/cls'".
431
// This is used only when there is no ciKlass available.
432
void xmlStream::klass(Klass* klass) {
433
  assert_if_no_error(inside_attrs(), "printing attributes");
434
  if (klass == nullptr) return;
435
  print_raw(" klass='");
436
  klass_text(klass);
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  print_raw("'");
438
}
439

440
void xmlStream::klass_text(Klass* klass) {
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  assert_if_no_error(inside_attrs(), "printing attributes");
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  if (klass == nullptr) return;
443
  //klass->print_short_name(log->out());
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  klass->name()->print_symbol_on(out());
445
}
446

447
void xmlStream::name(const Symbol* name) {
448
  assert_if_no_error(inside_attrs(), "printing attributes");
449
  if (name == nullptr)  return;
450
  print_raw(" name='");
451
  name_text(name);
452
  print_raw("'");
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}
454

455
void xmlStream::name_text(const Symbol* name) {
456
  assert_if_no_error(inside_attrs(), "printing attributes");
457
  if (name == nullptr)  return;
458
  //name->print_short_name(text());
459
  name->print_symbol_on(text());
460
}
461

462
void xmlStream::object(const char* attr, Handle x) {
463
  assert_if_no_error(inside_attrs(), "printing attributes");
464
  if (x == nullptr)  return;
465
  print_raw(" ");
466
  print_raw(attr);
467
  print_raw("='");
468
  object_text(x);
469
  print_raw("'");
470
}
471

472
void xmlStream::object_text(Handle x) {
473
  assert_if_no_error(inside_attrs(), "printing attributes");
474
  if (x == nullptr)  return;
475
  x->print_value_on(text());
476
}
477

478

479
void xmlStream::object(const char* attr, Metadata* x) {
480
  assert_if_no_error(inside_attrs(), "printing attributes");
481
  if (x == nullptr)  return;
482
  print_raw(" ");
483
  print_raw(attr);
484
  print_raw("='");
485
  object_text(x);
486
  print_raw("'");
487
}
488

489
void xmlStream::object_text(Metadata* x) {
490
  assert_if_no_error(inside_attrs(), "printing attributes");
491
  if (x == nullptr)  return;
492
  //x->print_value_on(text());
493
  if (x->is_method())
494
    method_text((Method*)x);
495
  else if (x->is_klass())
496
    klass_text((Klass*)x);
497
  else
498
    ShouldNotReachHere(); // Add impl if this is reached.
499
}
500

501

502
void xmlStream::flush() {
503
  out()->flush();
504
  _last_flush = count();
505
}
506

507
void xmlTextStream::flush() {
508
  if (_outer_xmlStream == nullptr)  return;
509
  _outer_xmlStream->flush();
510
}
511

512
void xmlTextStream::write(const char* str, size_t len) {
513
  if (_outer_xmlStream == nullptr)  return;
514
  _outer_xmlStream->write_text(str, len);
515
  update_position(str, len);
516
}
517

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