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hotspot/src/share/vm/compiler/compileLog.cpp

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+/*
+ * Copyright 2002-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_compileLog.cpp.incl"
+
+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) 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);
+
+  // 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);
+}
+
+
+// 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(ciObject* 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);
+    _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_klass()) {
+    ciKlass* klass = obj->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 (obj->is_method()) {
+    ciMethod* method = obj->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 (obj->is_symbol()) {
+    begin_elem("symbol id='%d'", id);
+    name(obj->as_symbol());
+    end_elem();
+  } else if (obj->is_null_object()) {
+    elem("null_object id='%d'", id);
+  } else if (obj->is_type()) {
+    BasicType type = obj->as_type()->basic_type();
+    elem("type id='%d' name='%s'", id, type2name(type));
+  } 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));
+}