/*

 * Copyright (c) 1997, 2016, 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 "classfile/systemDictionary.hpp"

#include "code/codeCache.hpp"

#include "code/icBuffer.hpp"

#include "code/nmethod.hpp"

#include "code/vtableStubs.hpp"

#include "compiler/compileBroker.hpp"

#include "compiler/disassembler.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "interpreter/bytecodeHistogram.hpp"

#include "interpreter/interpreter.hpp"

#include "memory/resourceArea.hpp"

#include "memory/universe.hpp"

#include "oops/oop.inline.hpp"

#include "prims/privilegedStack.hpp"

#include "runtime/arguments.hpp"

#include "runtime/atomic.inline.hpp"

#include "runtime/frame.hpp"

#include "runtime/java.hpp"

#include "runtime/os.hpp"

#include "runtime/sharedRuntime.hpp"

#include "runtime/stubCodeGenerator.hpp"

#include "runtime/stubRoutines.hpp"

#include "runtime/thread.inline.hpp"

#include "runtime/vframe.hpp"

#include "runtime/vm_version.hpp"

#include "services/heapDumper.hpp"

#include "utilities/defaultStream.hpp"

#include "utilities/events.hpp"

#include "utilities/top.hpp"

#include "utilities/vmError.hpp"

#ifndef ASSERT

#  ifdef _DEBUG

   // NOTE: don't turn the lines below into a comment -- if you're getting

   // a compile error here, change the settings to define ASSERT

   ASSERT should be defined when _DEBUG is defined.  It is not intended to be used for debugging

   functions that do not slow down the system too much and thus can be left in optimized code.

   On the other hand, the code should not be included in a production version.

#  endif // _DEBUG

#endif // ASSERT

#ifdef _DEBUG

#  ifndef ASSERT

     configuration error: ASSERT must be defined in debug version

#  endif // ASSERT

#endif // _DEBUG

#ifdef PRODUCT

#  if -defined _DEBUG || -defined ASSERT

     configuration error: ASSERT et al. must not be defined in PRODUCT version

#  endif

#endif // PRODUCT

FormatBufferResource::FormatBufferResource(const char * format, ...)

  : FormatBufferBase((char*)resource_allocate_bytes(FormatBufferBase::BufferSize)) {

  va_list argp;

  va_start(argp, format);

  jio_vsnprintf(_buf, FormatBufferBase::BufferSize, format, argp);

  va_end(argp);

}

ATTRIBUTE_PRINTF(1, 2)

void warning(const char* format, ...) {

  if (PrintWarnings) {

    FILE* const err = defaultStream::error_stream();

    jio_fprintf(err, "%s warning: ", VM_Version::vm_name());

    va_list ap;

    va_start(ap, format);

    vfprintf(err, format, ap);

    va_end(ap);

    fputc('\n', err);

  }

  if (BreakAtWarning) BREAKPOINT;

}

#ifndef PRODUCT

#define is_token_break(ch) (isspace(ch) || (ch) == ',')

static const char* last_file_name = NULL;

static int         last_line_no   = -1;

// assert/guarantee/... may happen very early during VM initialization.

// Don't rely on anything that is initialized by Threads::create_vm(). For

// example, don't use tty.

bool error_is_suppressed(const char* file_name, int line_no) {

  // The following 1-element cache requires that passed-in

  // file names are always only constant literals.

  if (file_name == last_file_name && line_no == last_line_no)  return true;

  int file_name_len = (int)strlen(file_name);

  char separator = os::file_separator()[0];

  const char* base_name = strrchr(file_name, separator);

  if (base_name == NULL)

    base_name = file_name;

  // scan the SuppressErrorAt option

  const char* cp = SuppressErrorAt;

  for (;;) {

    const char* sfile;

    int sfile_len;

    int sline;

    bool noisy;

    while ((*cp) != '\0' && is_token_break(*cp))  cp++;

    if ((*cp) == '\0')  break;

    sfile = cp;

    while ((*cp) != '\0' && !is_token_break(*cp) && (*cp) != ':')  cp++;

    sfile_len = cp - sfile;

    if ((*cp) == ':')  cp++;

    sline = 0;

    while ((*cp) != '\0' && isdigit(*cp)) {

      sline *= 10;

      sline += (*cp) - '0';

      cp++;

    }

    // "file:line!" means the assert suppression is not silent

    noisy = ((*cp) == '!');

    while ((*cp) != '\0' && !is_token_break(*cp))  cp++;

    // match the line

    if (sline != 0) {

      if (sline != line_no)  continue;

    }

    // match the file

    if (sfile_len > 0) {

      const char* look = file_name;

      const char* look_max = file_name + file_name_len - sfile_len;

      const char* foundp;

      bool match = false;

      while (!match

             && (foundp = strchr(look, sfile[0])) != NULL

             && foundp <= look_max) {

        match = true;

        for (int i = 1; i < sfile_len; i++) {

          if (sfile[i] != foundp[i]) {

            match = false;

            break;

          }

        }

        look = foundp + 1;

      }

      if (!match)  continue;

    }

    // got a match!

    if (noisy) {

      fdStream out(defaultStream::output_fd());

      out.print_raw("[error suppressed at ");

      out.print_raw(base_name);

      char buf[16];

      jio_snprintf(buf, sizeof(buf), ":%d]", line_no);

      out.print_raw_cr(buf);

    } else {

      // update 1-element cache for fast silent matches

      last_file_name = file_name;

      last_line_no   = line_no;

    }

    return true;

  }

  if (!is_error_reported()) {

    // print a friendly hint:

    fdStream out(defaultStream::output_fd());

    out.print_raw_cr("# To suppress the following error report, specify this argument");

    out.print_raw   ("# after -XX: or in .hotspotrc:  SuppressErrorAt=");

    out.print_raw   (base_name);

    char buf[16];

    jio_snprintf(buf, sizeof(buf), ":%d", line_no);

    out.print_raw_cr(buf);

  }

  return false;

}

#undef is_token_break

#else

// Place-holder for non-existent suppression check:

#define error_is_suppressed(file_name, line_no) (false)

#endif // !PRODUCT

void report_vm_error(const char* file, int line, const char* error_msg)

{

  report_vm_error(file, line, error_msg, "%s", "");

}

void report_vm_error(const char* file, int line, const char* error_msg, const char* detail_fmt, ...)

{

  if (Debugging || error_is_suppressed(file, line)) return;

  va_list detail_args;

  va_start(detail_args, detail_fmt);

  VMError::report_and_die(Thread::current_or_null(), file, line, error_msg, detail_fmt, detail_args);

  va_end(detail_args);

}

void report_fatal(const char* file, int line, const char* detail_fmt, ...)

{

  if (Debugging || error_is_suppressed(file, line)) return;

  va_list detail_args;

  va_start(detail_args, detail_fmt);

  VMError::report_and_die(Thread::current_or_null(), file, line, "fatal error", detail_fmt, detail_args);

  va_end(detail_args);

}

void report_vm_out_of_memory(const char* file, int line, size_t size,

                             VMErrorType vm_err_type, const char* detail_fmt, ...) {

  if (Debugging) return;

  va_list detail_args;

  va_start(detail_args, detail_fmt);

  VMError::report_and_die(Thread::current_or_null(), file, line, size, vm_err_type, detail_fmt, detail_args);

  va_end(detail_args);

  // The UseOSErrorReporting option in report_and_die() may allow a return

  // to here. If so then we'll have to figure out how to handle it.

  guarantee(false, "report_and_die() should not return here");

}

void report_should_not_call(const char* file, int line) {

  report_vm_error(file, line, "ShouldNotCall()");

}

void report_should_not_reach_here(const char* file, int line) {

  report_vm_error(file, line, "ShouldNotReachHere()");

}

void report_unimplemented(const char* file, int line) {

  report_vm_error(file, line, "Unimplemented()");

}

void report_untested(const char* file, int line, const char* message) {

#ifndef PRODUCT

  warning("Untested: %s in %s: %d\n", message, file, line);

#endif // !PRODUCT

}

void report_out_of_shared_space(SharedSpaceType shared_space) {

  static const char* name[] = {

    "shared read only space",

    "shared read write space",

    "shared miscellaneous data space",

    "shared miscellaneous code space"

  };

  static const char* flag[] = {

    "SharedReadOnlySize",

    "SharedReadWriteSize",

    "SharedMiscDataSize",

    "SharedMiscCodeSize"

  };

   warning("\nThe %s is not large enough\n"

           "to preload requested classes. Use -XX:%s=<size>\n"

           "to increase the initial size of %s.\n",

           name[shared_space], flag[shared_space], name[shared_space]);

   exit(2);

}

void report_insufficient_metaspace(size_t required_size) {

  warning("\nThe MaxMetaspaceSize of " SIZE_FORMAT " bytes is not large enough.\n"

          "Either don't specify the -XX:MaxMetaspaceSize=<size>\n"

          "or increase the size to at least " SIZE_FORMAT ".\n",

          MaxMetaspaceSize, required_size);

  exit(2);

}

void report_java_out_of_memory(const char* message) {

  static jint out_of_memory_reported = 0;

  // A number of threads may attempt to report OutOfMemoryError at around the

  // same time. To avoid dumping the heap or executing the data collection

  // commands multiple times we just do it once when the first threads reports

  // the error.

  if (Atomic::cmpxchg(1, &out_of_memory_reported, 0) == 0) {

    // create heap dump before OnOutOfMemoryError commands are executed

    if (HeapDumpOnOutOfMemoryError) {

      tty->print_cr("java.lang.OutOfMemoryError: %s", message);

      HeapDumper::dump_heap_from_oome();

    }

    if (OnOutOfMemoryError && OnOutOfMemoryError[0]) {

      VMError::report_java_out_of_memory(message);

    }

    if (CrashOnOutOfMemoryError) {

      tty->print_cr("Aborting due to java.lang.OutOfMemoryError: %s", message);

      fatal("OutOfMemory encountered: %s", message);

    }

    if (ExitOnOutOfMemoryError) {

      tty->print_cr("Terminating due to java.lang.OutOfMemoryError: %s", message);

      os::exit(3);

    }

  }

}

static bool error_reported = false;

// call this when the VM is dying--it might loosen some asserts

void set_error_reported() {

  error_reported = true;

}

bool is_error_reported() {

    return error_reported;

}

#ifndef PRODUCT

#include <signal.h>

typedef void (*voidfun_t)();

// Crash with an authentic sigfpe

static void crash_with_sigfpe() {

  // generate a native synchronous SIGFPE where possible;

  // if that did not cause a signal (e.g. on ppc), just

  // raise the signal.

  volatile int x = 0;

  volatile int y = 1/x;

#ifndef _WIN32

  // OSX implements raise(sig) incorrectly so we need to

  // explicitly target the current thread

  pthread_kill(pthread_self(), SIGFPE);

#endif

} // end: crash_with_sigfpe

// crash with sigsegv at non-null address.

static void crash_with_segfault() {

  char* const crash_addr = (char*) get_segfault_address();

  *crash_addr = 'X';

} // end: crash_with_segfault

// returns an address which is guaranteed to generate a SIGSEGV on read,

// for test purposes, which is not NULL and contains bits in every word

void* get_segfault_address() {

  return (void*)

#ifdef _LP64

    0xABC0000000000ABCULL;

#else

    0x00000ABC;

#endif

}

void test_error_handler() {

  controlled_crash(ErrorHandlerTest);

}

void controlled_crash(int how) {

  if (how == 0) return;

  // If asserts are disabled, use the corresponding guarantee instead.

  NOT_DEBUG(if (how <= 2) how += 2);

  const char* const str = "hello";

  const size_t      num = (size_t)os::vm_page_size();

  const char* const eol = os::line_separator();

  const char* const msg = "this message should be truncated during formatting";

  char * const dataPtr = NULL;  // bad data pointer

  const void (*funcPtr)(void) = (const void(*)()) 0xF;  // bad function pointer

  // Keep this in sync with test/runtime/ErrorHandling/ErrorHandler.java

  switch (how) {

    case  1: vmassert(str == NULL, "expected null");

    case  2: vmassert(num == 1023 && *str == 'X',

                      "num=" SIZE_FORMAT " str=\"%s\"", num, str);

    case  3: guarantee(str == NULL, "expected null");

    case  4: guarantee(num == 1023 && *str == 'X',

                       "num=" SIZE_FORMAT " str=\"%s\"", num, str);

    case  5: fatal("expected null");

    case  6: fatal("num=" SIZE_FORMAT " str=\"%s\"", num, str);

    case  7: fatal("%s%s#    %s%s#    %s%s#    %s%s#    %s%s#    "

                   "%s%s#    %s%s#    %s%s#    %s%s#    %s%s#    "

                   "%s%s#    %s%s#    %s%s#    %s%s#    %s",

                   msg, eol, msg, eol, msg, eol, msg, eol, msg, eol,

                   msg, eol, msg, eol, msg, eol, msg, eol, msg, eol,

                   msg, eol, msg, eol, msg, eol, msg, eol, msg);

    case  8: vm_exit_out_of_memory(num, OOM_MALLOC_ERROR, "ChunkPool::allocate");

    case  9: ShouldNotCallThis();

    case 10: ShouldNotReachHere();

    case 11: Unimplemented();

    // There's no guarantee the bad data pointer will crash us

    // so "break" out to the ShouldNotReachHere().

    case 12: *dataPtr = '\0'; break;

    // There's no guarantee the bad function pointer will crash us

    // so "break" out to the ShouldNotReachHere().

    case 13: (*funcPtr)(); break;

    case 14: crash_with_segfault(); break;

    case 15: crash_with_sigfpe(); break;

    default: tty->print_cr("ERROR: %d: unexpected test_num value.", how);

  }

  ShouldNotReachHere();

}

#endif // !PRODUCT

// ------ helper functions for debugging go here ------------

// All debug entries should be wrapped with a stack allocated

// Command object. It makes sure a resource mark is set and

// flushes the logfile to prevent file sharing problems.

class Command : public StackObj {

 private:

  ResourceMark rm;

  ResetNoHandleMark rnhm;

  HandleMark   hm;

  bool debug_save;

 public:

  static int level;

  Command(const char* str) {

    debug_save = Debugging;

    Debugging = true;

    if (level++ > 0)  return;

    tty->cr();

    tty->print_cr("\"Executing %s\"", str);

  }

  ~Command() {

        tty->flush();

        Debugging = debug_save;

        level--;

  }

};

int Command::level = 0;

#ifndef PRODUCT

extern "C" void blob(CodeBlob* cb) {

  Command c("blob");

  cb->print();

}

extern "C" void dump_vtable(address p) {

  Command c("dump_vtable");

  Klass* k = (Klass*)p;

  k->vtable()->print();

}

extern "C" void nm(intptr_t p) {

  // Actually we look through all CodeBlobs (the nm name has been kept for backwards compatability)

  Command c("nm");

  CodeBlob* cb = CodeCache::find_blob((address)p);

  if (cb == NULL) {

    tty->print_cr("NULL");

  } else {

    cb->print();

  }

}

extern "C" void disnm(intptr_t p) {

  Command c("disnm");

  CodeBlob* cb = CodeCache::find_blob((address) p);

  if (cb != NULL) {

    nmethod* nm = cb->as_nmethod_or_null();

    if (nm != NULL) {

      nm->print();

    } else {

      cb->print();

    }

    Disassembler::decode(cb);

  }

}

extern "C" void printnm(intptr_t p) {

  char buffer[256];

  sprintf(buffer, "printnm: " INTPTR_FORMAT, p);

  Command c(buffer);

  CodeBlob* cb = CodeCache::find_blob((address) p);

  if (cb->is_nmethod()) {

    nmethod* nm = (nmethod*)cb;

    nm->print_nmethod(true);

  }

}