nmethod.cpp 103.4 KB
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * 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.
 *
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 * 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.
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 *
 */

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#include "precompiled.hpp"
#include "code/codeCache.hpp"
#include "code/compiledIC.hpp"
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#include "code/dependencies.hpp"
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#include "code/nmethod.hpp"
#include "code/scopeDesc.hpp"
#include "compiler/abstractCompiler.hpp"
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#include "compiler/compileBroker.hpp"
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#include "compiler/compileLog.hpp"
#include "compiler/compilerOracle.hpp"
#include "compiler/disassembler.hpp"
#include "interpreter/bytecode.hpp"
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#include "oops/methodData.hpp"
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#include "prims/jvmtiRedefineClassesTrace.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "runtime/sharedRuntime.hpp"
#include "runtime/sweeper.hpp"
#include "utilities/dtrace.hpp"
#include "utilities/events.hpp"
#include "utilities/xmlstream.hpp"
#ifdef SHARK
#include "shark/sharkCompiler.hpp"
#endif
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#ifdef DTRACE_ENABLED

// Only bother with this argument setup if dtrace is available

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#ifndef USDT2
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HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load,
  const char*, int, const char*, int, const char*, int, void*, size_t);

HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload,
  char*, int, char*, int, char*, int);

#define DTRACE_METHOD_UNLOAD_PROBE(method)                                \
  {                                                                       \
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    Method* m = (method);                                                 \
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    if (m != NULL) {                                                      \
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      Symbol* klass_name = m->klass_name();                               \
      Symbol* name = m->name();                                           \
      Symbol* signature = m->signature();                                 \
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      HS_DTRACE_PROBE6(hotspot, compiled__method__unload,                 \
        klass_name->bytes(), klass_name->utf8_length(),                   \
        name->bytes(), name->utf8_length(),                               \
        signature->bytes(), signature->utf8_length());                    \
    }                                                                     \
  }
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#else /* USDT2 */
#define DTRACE_METHOD_UNLOAD_PROBE(method)                                \
  {                                                                       \
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    Method* m = (method);                                                 \
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    if (m != NULL) {                                                      \
      Symbol* klass_name = m->klass_name();                               \
      Symbol* name = m->name();                                           \
      Symbol* signature = m->signature();                                 \
      HOTSPOT_COMPILED_METHOD_UNLOAD(                                     \
        (char *) klass_name->bytes(), klass_name->utf8_length(),                   \
        (char *) name->bytes(), name->utf8_length(),                               \
        (char *) signature->bytes(), signature->utf8_length());                    \
    }                                                                     \
  }
#endif /* USDT2 */
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#else //  ndef DTRACE_ENABLED

#define DTRACE_METHOD_UNLOAD_PROBE(method)

#endif

bool nmethod::is_compiled_by_c1() const {
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  if (compiler() == NULL) {
    return false;
  }
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  return compiler()->is_c1();
}
bool nmethod::is_compiled_by_c2() const {
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  if (compiler() == NULL) {
    return false;
  }
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  return compiler()->is_c2();
}
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bool nmethod::is_compiled_by_shark() const {
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  if (compiler() == NULL) {
    return false;
  }
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  return compiler()->is_shark();
}
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//---------------------------------------------------------------------------------
// NMethod statistics
// They are printed under various flags, including:
//   PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
// (In the latter two cases, they like other stats are printed to the log only.)

#ifndef PRODUCT
// These variables are put into one block to reduce relocations
// and make it simpler to print from the debugger.
static
struct nmethod_stats_struct {
  int nmethod_count;
  int total_size;
  int relocation_size;
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  int consts_size;
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  int insts_size;
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  int stub_size;
  int scopes_data_size;
  int scopes_pcs_size;
  int dependencies_size;
  int handler_table_size;
  int nul_chk_table_size;
  int oops_size;

  void note_nmethod(nmethod* nm) {
    nmethod_count += 1;
    total_size          += nm->size();
    relocation_size     += nm->relocation_size();
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    consts_size         += nm->consts_size();
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    insts_size          += nm->insts_size();
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    stub_size           += nm->stub_size();
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    oops_size           += nm->oops_size();
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    scopes_data_size    += nm->scopes_data_size();
    scopes_pcs_size     += nm->scopes_pcs_size();
    dependencies_size   += nm->dependencies_size();
    handler_table_size  += nm->handler_table_size();
    nul_chk_table_size  += nm->nul_chk_table_size();
  }
  void print_nmethod_stats() {
    if (nmethod_count == 0)  return;
    tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count);
    if (total_size != 0)          tty->print_cr(" total in heap  = %d", total_size);
    if (relocation_size != 0)     tty->print_cr(" relocation     = %d", relocation_size);
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    if (consts_size != 0)         tty->print_cr(" constants      = %d", consts_size);
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    if (insts_size != 0)          tty->print_cr(" main code      = %d", insts_size);
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    if (stub_size != 0)           tty->print_cr(" stub code      = %d", stub_size);
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    if (oops_size != 0)           tty->print_cr(" oops           = %d", oops_size);
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    if (scopes_data_size != 0)    tty->print_cr(" scopes data    = %d", scopes_data_size);
    if (scopes_pcs_size != 0)     tty->print_cr(" scopes pcs     = %d", scopes_pcs_size);
    if (dependencies_size != 0)   tty->print_cr(" dependencies   = %d", dependencies_size);
    if (handler_table_size != 0)  tty->print_cr(" handler table  = %d", handler_table_size);
    if (nul_chk_table_size != 0)  tty->print_cr(" nul chk table  = %d", nul_chk_table_size);
  }

  int native_nmethod_count;
  int native_total_size;
  int native_relocation_size;
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  int native_insts_size;
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  int native_oops_size;
  void note_native_nmethod(nmethod* nm) {
    native_nmethod_count += 1;
    native_total_size       += nm->size();
    native_relocation_size  += nm->relocation_size();
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    native_insts_size       += nm->insts_size();
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    native_oops_size        += nm->oops_size();
  }
  void print_native_nmethod_stats() {
    if (native_nmethod_count == 0)  return;
    tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count);
    if (native_total_size != 0)       tty->print_cr(" N. total size  = %d", native_total_size);
    if (native_relocation_size != 0)  tty->print_cr(" N. relocation  = %d", native_relocation_size);
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    if (native_insts_size != 0)       tty->print_cr(" N. main code   = %d", native_insts_size);
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    if (native_oops_size != 0)        tty->print_cr(" N. oops        = %d", native_oops_size);
  }

  int pc_desc_resets;   // number of resets (= number of caches)
  int pc_desc_queries;  // queries to nmethod::find_pc_desc
  int pc_desc_approx;   // number of those which have approximate true
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  int pc_desc_repeats;  // number of _pc_descs[0] hits
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  int pc_desc_hits;     // number of LRU cache hits
  int pc_desc_tests;    // total number of PcDesc examinations
  int pc_desc_searches; // total number of quasi-binary search steps
  int pc_desc_adds;     // number of LUR cache insertions

  void print_pc_stats() {
    tty->print_cr("PcDesc Statistics:  %d queries, %.2f comparisons per query",
                  pc_desc_queries,
                  (double)(pc_desc_tests + pc_desc_searches)
                  / pc_desc_queries);
    tty->print_cr("  caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d",
                  pc_desc_resets,
                  pc_desc_queries, pc_desc_approx,
                  pc_desc_repeats, pc_desc_hits,
                  pc_desc_tests, pc_desc_searches, pc_desc_adds);
  }
} nmethod_stats;
#endif //PRODUCT


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//---------------------------------------------------------------------------------
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ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
  assert(pc != NULL, "Must be non null");
  assert(exception.not_null(), "Must be non null");
  assert(handler != NULL, "Must be non null");

  _count = 0;
  _exception_type = exception->klass();
  _next = NULL;

  add_address_and_handler(pc,handler);
}


address ExceptionCache::match(Handle exception, address pc) {
  assert(pc != NULL,"Must be non null");
  assert(exception.not_null(),"Must be non null");
  if (exception->klass() == exception_type()) {
    return (test_address(pc));
  }

  return NULL;
}


bool ExceptionCache::match_exception_with_space(Handle exception) {
  assert(exception.not_null(),"Must be non null");
  if (exception->klass() == exception_type() && count() < cache_size) {
    return true;
  }
  return false;
}


address ExceptionCache::test_address(address addr) {
  for (int i=0; i<count(); i++) {
    if (pc_at(i) == addr) {
      return handler_at(i);
    }
  }
  return NULL;
}


bool ExceptionCache::add_address_and_handler(address addr, address handler) {
  if (test_address(addr) == handler) return true;
  if (count() < cache_size) {
    set_pc_at(count(),addr);
    set_handler_at(count(), handler);
    increment_count();
    return true;
  }
  return false;
}


// private method for handling exception cache
// These methods are private, and used to manipulate the exception cache
// directly.
ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
  ExceptionCache* ec = exception_cache();
  while (ec != NULL) {
    if (ec->match_exception_with_space(exception)) {
      return ec;
    }
    ec = ec->next();
  }
  return NULL;
}


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


// Helper used by both find_pc_desc methods.
static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
  NOT_PRODUCT(++nmethod_stats.pc_desc_tests);
  if (!approximate)
    return pc->pc_offset() == pc_offset;
  else
    return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
}

void PcDescCache::reset_to(PcDesc* initial_pc_desc) {
  if (initial_pc_desc == NULL) {
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    _pc_descs[0] = NULL; // native method; no PcDescs at all
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    return;
  }
  NOT_PRODUCT(++nmethod_stats.pc_desc_resets);
  // reset the cache by filling it with benign (non-null) values
  assert(initial_pc_desc->pc_offset() < 0, "must be sentinel");
  for (int i = 0; i < cache_size; i++)
    _pc_descs[i] = initial_pc_desc;
}

PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
  NOT_PRODUCT(++nmethod_stats.pc_desc_queries);
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  NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx);

  // Note: one might think that caching the most recently
  // read value separately would be a win, but one would be
  // wrong.  When many threads are updating it, the cache
  // line it's in would bounce between caches, negating
  // any benefit.
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  // In order to prevent race conditions do not load cache elements
  // repeatedly, but use a local copy:
  PcDesc* res;

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  // Step one:  Check the most recently added value.
  res = _pc_descs[0];
  if (res == NULL) return NULL;  // native method; no PcDescs at all
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  if (match_desc(res, pc_offset, approximate)) {
    NOT_PRODUCT(++nmethod_stats.pc_desc_repeats);
    return res;
  }

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  // Step two:  Check the rest of the LRU cache.
  for (int i = 1; i < cache_size; ++i) {
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    res = _pc_descs[i];
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    if (res->pc_offset() < 0) break;  // optimization: skip empty cache
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    if (match_desc(res, pc_offset, approximate)) {
      NOT_PRODUCT(++nmethod_stats.pc_desc_hits);
      return res;
    }
  }

  // Report failure.
  return NULL;
}

void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
  NOT_PRODUCT(++nmethod_stats.pc_desc_adds);
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  // Update the LRU cache by shifting pc_desc forward.
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  for (int i = 0; i < cache_size; i++)  {
    PcDesc* next = _pc_descs[i];
    _pc_descs[i] = pc_desc;
    pc_desc = next;
  }
}

// adjust pcs_size so that it is a multiple of both oopSize and
// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
// of oopSize, then 2*sizeof(PcDesc) is)
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static int adjust_pcs_size(int pcs_size) {
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  int nsize = round_to(pcs_size,   oopSize);
  if ((nsize % sizeof(PcDesc)) != 0) {
    nsize = pcs_size + sizeof(PcDesc);
  }
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  assert((nsize % oopSize) == 0, "correct alignment");
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  return nsize;
}

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


void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
  assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
  assert(new_entry != NULL,"Must be non null");
  assert(new_entry->next() == NULL, "Must be null");

  if (exception_cache() != NULL) {
    new_entry->set_next(exception_cache());
  }
  set_exception_cache(new_entry);
}

void nmethod::remove_from_exception_cache(ExceptionCache* ec) {
  ExceptionCache* prev = NULL;
  ExceptionCache* curr = exception_cache();
  assert(curr != NULL, "nothing to remove");
  // find the previous and next entry of ec
  while (curr != ec) {
    prev = curr;
    curr = curr->next();
    assert(curr != NULL, "ExceptionCache not found");
  }
  // now: curr == ec
  ExceptionCache* next = curr->next();
  if (prev == NULL) {
    set_exception_cache(next);
  } else {
    prev->set_next(next);
  }
  delete curr;
}


// public method for accessing the exception cache
// These are the public access methods.
address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
  // We never grab a lock to read the exception cache, so we may
  // have false negatives. This is okay, as it can only happen during
  // the first few exception lookups for a given nmethod.
  ExceptionCache* ec = exception_cache();
  while (ec != NULL) {
    address ret_val;
    if ((ret_val = ec->match(exception,pc)) != NULL) {
      return ret_val;
    }
    ec = ec->next();
  }
  return NULL;
}


void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
  // There are potential race conditions during exception cache updates, so we
  // must own the ExceptionCache_lock before doing ANY modifications. Because
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  // we don't lock during reads, it is possible to have several threads attempt
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  // to update the cache with the same data. We need to check for already inserted
  // copies of the current data before adding it.

  MutexLocker ml(ExceptionCache_lock);
  ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);

  if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) {
    target_entry = new ExceptionCache(exception,pc,handler);
    add_exception_cache_entry(target_entry);
  }
}


//-------------end of code for ExceptionCache--------------


int nmethod::total_size() const {
  return
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    consts_size()        +
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    insts_size()         +
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    stub_size()          +
    scopes_data_size()   +
    scopes_pcs_size()    +
    handler_table_size() +
    nul_chk_table_size();
}

const char* nmethod::compile_kind() const {
  if (is_osr_method())     return "osr";
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  if (method() != NULL && is_native_method())  return "c2n";
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  return NULL;
}

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// Fill in default values for various flag fields
void nmethod::init_defaults() {
  _state                      = alive;
  _marked_for_reclamation     = 0;
  _has_flushed_dependencies   = 0;
  _has_unsafe_access          = 0;
  _has_method_handle_invokes  = 0;
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  _lazy_critical_native       = 0;
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  _has_wide_vectors           = 0;
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  _marked_for_deoptimization  = 0;
  _lock_count                 = 0;
  _stack_traversal_mark       = 0;
  _unload_reported            = false;           // jvmti state

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#ifdef ASSERT
  _oops_are_stale             = false;
#endif

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  _oops_do_mark_link       = NULL;
  _jmethod_id              = NULL;
  _osr_link                = NULL;
  _scavenge_root_link      = NULL;
  _scavenge_root_state     = 0;
  _compiler                = NULL;

#ifdef HAVE_DTRACE_H
  _trap_offset             = 0;
#endif // def HAVE_DTRACE_H
}
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nmethod* nmethod::new_native_nmethod(methodHandle method,
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  int compile_id,
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  CodeBuffer *code_buffer,
  int vep_offset,
  int frame_complete,
  int frame_size,
  ByteSize basic_lock_owner_sp_offset,
  ByteSize basic_lock_sp_offset,
  OopMapSet* oop_maps) {
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  code_buffer->finalize_oop_references(method);
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  // create nmethod
  nmethod* nm = NULL;
  {
    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
    int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
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    CodeOffsets offsets;
    offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
    offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
    nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size,
                                            compile_id, &offsets,
                                            code_buffer, frame_size,
                                            basic_lock_owner_sp_offset,
                                            basic_lock_sp_offset, oop_maps);
    NOT_PRODUCT(if (nm != NULL)  nmethod_stats.note_native_nmethod(nm));
    if (PrintAssembly && nm != NULL) {
      Disassembler::decode(nm);
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    }
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  }
  // verify nmethod
  debug_only(if (nm) nm->verify();) // might block

  if (nm != NULL) {
    nm->log_new_nmethod();
  }

  return nm;
}

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#ifdef HAVE_DTRACE_H
nmethod* nmethod::new_dtrace_nmethod(methodHandle method,
                                     CodeBuffer *code_buffer,
                                     int vep_offset,
                                     int trap_offset,
                                     int frame_complete,
                                     int frame_size) {
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  code_buffer->finalize_oop_references(method);
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  // create nmethod
  nmethod* nm = NULL;
  {
    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
    int nmethod_size = allocation_size(code_buffer, sizeof(nmethod));
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    CodeOffsets offsets;
    offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
    offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset);
    offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);

    nm = new (nmethod_size) nmethod(method(), nmethod_size,
                                    &offsets, code_buffer, frame_size);

    NOT_PRODUCT(if (nm != NULL)  nmethod_stats.note_nmethod(nm));
    if (PrintAssembly && nm != NULL) {
      Disassembler::decode(nm);
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    }
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  }
  // verify nmethod
  debug_only(if (nm) nm->verify();) // might block

  if (nm != NULL) {
    nm->log_new_nmethod();
  }

  return nm;
}

#endif // def HAVE_DTRACE_H

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nmethod* nmethod::new_nmethod(methodHandle method,
  int compile_id,
  int entry_bci,
  CodeOffsets* offsets,
  int orig_pc_offset,
  DebugInformationRecorder* debug_info,
  Dependencies* dependencies,
  CodeBuffer* code_buffer, int frame_size,
  OopMapSet* oop_maps,
  ExceptionHandlerTable* handler_table,
  ImplicitExceptionTable* nul_chk_table,
  AbstractCompiler* compiler,
  int comp_level
)
{
  assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
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  code_buffer->finalize_oop_references(method);
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  // create nmethod
  nmethod* nm = NULL;
  { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
    int nmethod_size =
      allocation_size(code_buffer, sizeof(nmethod))
      + adjust_pcs_size(debug_info->pcs_size())
      + round_to(dependencies->size_in_bytes() , oopSize)
      + round_to(handler_table->size_in_bytes(), oopSize)
      + round_to(nul_chk_table->size_in_bytes(), oopSize)
      + round_to(debug_info->data_size()       , oopSize);
593 594 595 596 597 598 599 600 601 602

    nm = new (nmethod_size)
    nmethod(method(), nmethod_size, compile_id, entry_bci, offsets,
            orig_pc_offset, debug_info, dependencies, code_buffer, frame_size,
            oop_maps,
            handler_table,
            nul_chk_table,
            compiler,
            comp_level);

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    if (nm != NULL) {
      // To make dependency checking during class loading fast, record
      // the nmethod dependencies in the classes it is dependent on.
      // This allows the dependency checking code to simply walk the
      // class hierarchy above the loaded class, checking only nmethods
      // which are dependent on those classes.  The slow way is to
      // check every nmethod for dependencies which makes it linear in
      // the number of methods compiled.  For applications with a lot
      // classes the slow way is too slow.
      for (Dependencies::DepStream deps(nm); deps.next(); ) {
613
        Klass* klass = deps.context_type();
614 615 616
        if (klass == NULL) {
          continue;  // ignore things like evol_method
        }
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        // record this nmethod as dependent on this klass
619
        InstanceKlass::cast(klass)->add_dependent_nmethod(nm);
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      }
621 622 623 624
      NOT_PRODUCT(nmethod_stats.note_nmethod(nm));
      if (PrintAssembly) {
        Disassembler::decode(nm);
      }
625
    }
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  }
627
  // Do verification and logging outside CodeCache_lock.
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  if (nm != NULL) {
629 630
    // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
    DEBUG_ONLY(nm->verify();)
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    nm->log_new_nmethod();
  }
  return nm;
}


// For native wrappers
nmethod::nmethod(
639
  Method* method,
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  int nmethod_size,
641
  int compile_id,
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  CodeOffsets* offsets,
  CodeBuffer* code_buffer,
  int frame_size,
  ByteSize basic_lock_owner_sp_offset,
  ByteSize basic_lock_sp_offset,
  OopMapSet* oop_maps )
  : CodeBlob("native nmethod", code_buffer, sizeof(nmethod),
             nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
650 651
  _native_receiver_sp_offset(basic_lock_owner_sp_offset),
  _native_basic_lock_sp_offset(basic_lock_sp_offset)
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{
  {
    debug_only(No_Safepoint_Verifier nsv;)
    assert_locked_or_safepoint(CodeCache_lock);

657
    init_defaults();
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    _method                  = method;
    _entry_bci               = InvocationEntryBci;
    // We have no exception handler or deopt handler make the
    // values something that will never match a pc like the nmethod vtable entry
    _exception_offset        = 0;
    _deoptimize_offset       = 0;
664
    _deoptimize_mh_offset    = 0;
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    _orig_pc_offset          = 0;
666

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    _consts_offset           = data_offset();
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    _stub_offset             = data_offset();
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    _oops_offset             = data_offset();
670 671
    _metadata_offset         = _oops_offset         + round_to(code_buffer->total_oop_size(), oopSize);
    _scopes_data_offset      = _metadata_offset     + round_to(code_buffer->total_metadata_size(), wordSize);
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    _scopes_pcs_offset       = _scopes_data_offset;
    _dependencies_offset     = _scopes_pcs_offset;
    _handler_table_offset    = _dependencies_offset;
    _nul_chk_table_offset    = _handler_table_offset;
    _nmethod_end_offset      = _nul_chk_table_offset;
677
    _compile_id              = compile_id;
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    _comp_level              = CompLevel_none;
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    _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
    _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
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    _osr_entry_point         = NULL;
    _exception_cache         = NULL;
    _pc_desc_cache.reset_to(NULL);
684
    _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
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686
    code_buffer->copy_values_to(this);
687 688
    if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
      CodeCache::add_scavenge_root_nmethod(this);
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      Universe::heap()->register_nmethod(this);
690
    }
691
    debug_only(verify_scavenge_root_oops());
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    CodeCache::commit(this);
  }

  if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
    ttyLocker ttyl;  // keep the following output all in one block
    // This output goes directly to the tty, not the compiler log.
    // To enable tools to match it up with the compilation activity,
    // be sure to tag this tty output with the compile ID.
    if (xtty != NULL) {
      xtty->begin_head("print_native_nmethod");
      xtty->method(_method);
      xtty->stamp();
      xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
    }
    // print the header part first
    print();
    // then print the requested information
    if (PrintNativeNMethods) {
      print_code();
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      if (oop_maps != NULL) {
        oop_maps->print();
      }
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    }
    if (PrintRelocations) {
      print_relocations();
    }
    if (xtty != NULL) {
      xtty->tail("print_native_nmethod");
    }
  }
}

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// For dtrace wrappers
#ifdef HAVE_DTRACE_H
nmethod::nmethod(
727
  Method* method,
728 729 730 731 732 733
  int nmethod_size,
  CodeOffsets* offsets,
  CodeBuffer* code_buffer,
  int frame_size)
  : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod),
             nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL),
734 735
  _native_receiver_sp_offset(in_ByteSize(-1)),
  _native_basic_lock_sp_offset(in_ByteSize(-1))
736 737 738 739 740
{
  {
    debug_only(No_Safepoint_Verifier nsv;)
    assert_locked_or_safepoint(CodeCache_lock);

741
    init_defaults();
742 743 744 745 746 747
    _method                  = method;
    _entry_bci               = InvocationEntryBci;
    // We have no exception handler or deopt handler make the
    // values something that will never match a pc like the nmethod vtable entry
    _exception_offset        = 0;
    _deoptimize_offset       = 0;
748
    _deoptimize_mh_offset    = 0;
749
    _unwind_handler_offset   = -1;
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    _trap_offset             = offsets->value(CodeOffsets::Dtrace_trap);
    _orig_pc_offset          = 0;
    _consts_offset           = data_offset();
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    _stub_offset             = data_offset();
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    _oops_offset             = data_offset();
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    _metadata_offset         = _oops_offset         + round_to(code_buffer->total_oop_size(), oopSize);
    _scopes_data_offset      = _metadata_offset     + round_to(code_buffer->total_metadata_size(), wordSize);
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    _scopes_pcs_offset       = _scopes_data_offset;
    _dependencies_offset     = _scopes_pcs_offset;
    _handler_table_offset    = _dependencies_offset;
    _nul_chk_table_offset    = _handler_table_offset;
    _nmethod_end_offset      = _nul_chk_table_offset;
    _compile_id              = 0;  // default
    _comp_level              = CompLevel_none;
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    _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
    _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
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    _osr_entry_point         = NULL;
    _exception_cache         = NULL;
    _pc_desc_cache.reset_to(NULL);
769
    _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
770

771
    code_buffer->copy_values_to(this);
772
    debug_only(verify_scavenge_root_oops());
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    CodeCache::commit(this);
  }

  if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
    ttyLocker ttyl;  // keep the following output all in one block
    // This output goes directly to the tty, not the compiler log.
    // To enable tools to match it up with the compilation activity,
    // be sure to tag this tty output with the compile ID.
    if (xtty != NULL) {
      xtty->begin_head("print_dtrace_nmethod");
      xtty->method(_method);
      xtty->stamp();
      xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
    }
    // print the header part first
    print();
    // then print the requested information
    if (PrintNMethods) {
      print_code();
    }
    if (PrintRelocations) {
      print_relocations();
    }
    if (xtty != NULL) {
      xtty->tail("print_dtrace_nmethod");
    }
  }
}
#endif // def HAVE_DTRACE_H
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803
void* nmethod::operator new(size_t size, int nmethod_size) throw() {
804 805
  // Not critical, may return null if there is too little continuous memory
  return CodeCache::allocate(nmethod_size);
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}

nmethod::nmethod(
809
  Method* method,
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  int nmethod_size,
  int compile_id,
  int entry_bci,
  CodeOffsets* offsets,
  int orig_pc_offset,
  DebugInformationRecorder* debug_info,
  Dependencies* dependencies,
  CodeBuffer *code_buffer,
  int frame_size,
  OopMapSet* oop_maps,
  ExceptionHandlerTable* handler_table,
  ImplicitExceptionTable* nul_chk_table,
  AbstractCompiler* compiler,
  int comp_level
  )
  : CodeBlob("nmethod", code_buffer, sizeof(nmethod),
             nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps),
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  _native_receiver_sp_offset(in_ByteSize(-1)),
  _native_basic_lock_sp_offset(in_ByteSize(-1))
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{
  assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
  {
    debug_only(No_Safepoint_Verifier nsv;)
    assert_locked_or_safepoint(CodeCache_lock);

835
    init_defaults();
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    _method                  = method;
837
    _entry_bci               = entry_bci;
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    _compile_id              = compile_id;
    _comp_level              = comp_level;
    _compiler                = compiler;
    _orig_pc_offset          = orig_pc_offset;
842
    _hotness_counter         = NMethodSweeper::hotness_counter_reset_val();
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    // Section offsets
845 846
    _consts_offset           = content_offset()      + code_buffer->total_offset_of(code_buffer->consts());
    _stub_offset             = content_offset()      + code_buffer->total_offset_of(code_buffer->stubs());
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    // Exception handler and deopt handler are in the stub section
849 850
    assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
    assert(offsets->value(CodeOffsets::Deopt     ) != -1, "must be set");
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    _exception_offset        = _stub_offset          + offsets->value(CodeOffsets::Exceptions);
    _deoptimize_offset       = _stub_offset          + offsets->value(CodeOffsets::Deopt);
853
    if (offsets->value(CodeOffsets::DeoptMH) != -1) {
854 855 856 857
      _deoptimize_mh_offset  = _stub_offset          + offsets->value(CodeOffsets::DeoptMH);
    } else {
      _deoptimize_mh_offset  = -1;
    }
858
    if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
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      _unwind_handler_offset = code_offset()         + offsets->value(CodeOffsets::UnwindHandler);
860
    } else {
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      _unwind_handler_offset = -1;
862
    }
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864
    _oops_offset             = data_offset();
865 866 867
    _metadata_offset         = _oops_offset          + round_to(code_buffer->total_oop_size(), oopSize);
    _scopes_data_offset      = _metadata_offset      + round_to(code_buffer->total_metadata_size(), wordSize);

868
    _scopes_pcs_offset       = _scopes_data_offset   + round_to(debug_info->data_size       (), oopSize);
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    _dependencies_offset     = _scopes_pcs_offset    + adjust_pcs_size(debug_info->pcs_size());
    _handler_table_offset    = _dependencies_offset  + round_to(dependencies->size_in_bytes (), oopSize);
    _nul_chk_table_offset    = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize);
    _nmethod_end_offset      = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize);

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    _entry_point             = code_begin()          + offsets->value(CodeOffsets::Entry);
    _verified_entry_point    = code_begin()          + offsets->value(CodeOffsets::Verified_Entry);
    _osr_entry_point         = code_begin()          + offsets->value(CodeOffsets::OSR_Entry);
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    _exception_cache         = NULL;
    _pc_desc_cache.reset_to(scopes_pcs_begin());

    // Copy contents of ScopeDescRecorder to nmethod
881
    code_buffer->copy_values_to(this);
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    debug_info->copy_to(this);
    dependencies->copy_to(this);
884 885
    if (ScavengeRootsInCode && detect_scavenge_root_oops()) {
      CodeCache::add_scavenge_root_nmethod(this);
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      Universe::heap()->register_nmethod(this);
887 888
    }
    debug_only(verify_scavenge_root_oops());
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    CodeCache::commit(this);

    // Copy contents of ExceptionHandlerTable to nmethod
    handler_table->copy_to(this);
    nul_chk_table->copy_to(this);

    // we use the information of entry points to find out if a method is
    // static or non static
    assert(compiler->is_c2() ||
           _method->is_static() == (entry_point() == _verified_entry_point),
           " entry points must be same for static methods and vice versa");
  }

903 904 905
  bool printnmethods = PrintNMethods
    || CompilerOracle::should_print(_method)
    || CompilerOracle::has_option_string(_method, "PrintNMethods");
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  if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
    print_nmethod(printnmethods);
  }
}


// Print a short set of xml attributes to identify this nmethod.  The
// output should be embedded in some other element.
void nmethod::log_identity(xmlStream* log) const {
  log->print(" compile_id='%d'", compile_id());
  const char* nm_kind = compile_kind();
  if (nm_kind != NULL)  log->print(" compile_kind='%s'", nm_kind);
  if (compiler() != NULL) {
    log->print(" compiler='%s'", compiler()->name());
  }
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  if (TieredCompilation) {
    log->print(" level='%d'", comp_level());
  }
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}


#define LOG_OFFSET(log, name)                    \
  if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \
    log->print(" " XSTR(name) "_offset='%d'"    , \
               (intptr_t)name##_begin() - (intptr_t)this)


void nmethod::log_new_nmethod() const {
  if (LogCompilation && xtty != NULL) {
    ttyLocker ttyl;
    HandleMark hm;
    xtty->begin_elem("nmethod");
    log_identity(xtty);
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    xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size());
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    xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);

    LOG_OFFSET(xtty, relocation);
943
    LOG_OFFSET(xtty, consts);
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    LOG_OFFSET(xtty, insts);
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    LOG_OFFSET(xtty, stub);
    LOG_OFFSET(xtty, scopes_data);
    LOG_OFFSET(xtty, scopes_pcs);
    LOG_OFFSET(xtty, dependencies);
    LOG_OFFSET(xtty, handler_table);
    LOG_OFFSET(xtty, nul_chk_table);
    LOG_OFFSET(xtty, oops);

    xtty->method(method());
    xtty->stamp();
    xtty->end_elem();
  }
}

#undef LOG_OFFSET


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// Print out more verbose output usually for a newly created nmethod.
963
void nmethod::print_on(outputStream* st, const char* msg) const {
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  if (st != NULL) {
    ttyLocker ttyl;
966 967 968 969 970 971
    if (WizardMode) {
      CompileTask::print_compilation(st, this, msg, /*short_form:*/ true);
      st->print_cr(" (" INTPTR_FORMAT ")", this);
    } else {
      CompileTask::print_compilation(st, this, msg, /*short_form:*/ false);
    }
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  }
}


void nmethod::print_nmethod(bool printmethod) {
  ttyLocker ttyl;  // keep the following output all in one block
  if (xtty != NULL) {
    xtty->begin_head("print_nmethod");
    xtty->stamp();
    xtty->end_head();
  }
  // print the header part first
  print();
  // then print the requested information
  if (printmethod) {
    print_code();
    print_pcs();
989 990 991
    if (oop_maps()) {
      oop_maps()->print();
    }
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  }
  if (PrintDebugInfo) {
    print_scopes();
  }
  if (PrintRelocations) {
    print_relocations();
  }
  if (PrintDependencies) {
    print_dependencies();
  }
  if (PrintExceptionHandlers) {
    print_handler_table();
    print_nul_chk_table();
  }
  if (xtty != NULL) {
    xtty->tail("print_nmethod");
  }
}


1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
// Promote one word from an assembly-time handle to a live embedded oop.
inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
  if (handle == NULL ||
      // As a special case, IC oops are initialized to 1 or -1.
      handle == (jobject) Universe::non_oop_word()) {
    (*dest) = (oop) handle;
  } else {
    (*dest) = JNIHandles::resolve_non_null(handle);
  }
}


1024 1025
// Have to have the same name because it's called by a template
void nmethod::copy_values(GrowableArray<jobject>* array) {
1026
  int length = array->length();
1027
  assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
  oop* dest = oops_begin();
  for (int index = 0 ; index < length; index++) {
    initialize_immediate_oop(&dest[index], array->at(index));
  }

  // Now we can fix up all the oops in the code.  We need to do this
  // in the code because the assembler uses jobjects as placeholders.
  // The code and relocations have already been initialized by the
  // CodeBlob constructor, so it is valid even at this early point to
  // iterate over relocations and patch the code.
  fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true);
}

1041 1042 1043 1044 1045 1046 1047 1048
void nmethod::copy_values(GrowableArray<Metadata*>* array) {
  int length = array->length();
  assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
  Metadata** dest = metadata_begin();
  for (int index = 0 ; index < length; index++) {
    dest[index] = array->at(index);
  }
}
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082

bool nmethod::is_at_poll_return(address pc) {
  RelocIterator iter(this, pc, pc+1);
  while (iter.next()) {
    if (iter.type() == relocInfo::poll_return_type)
      return true;
  }
  return false;
}


bool nmethod::is_at_poll_or_poll_return(address pc) {
  RelocIterator iter(this, pc, pc+1);
  while (iter.next()) {
    relocInfo::relocType t = iter.type();
    if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
      return true;
  }
  return false;
}


void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
  // re-patch all oop-bearing instructions, just in case some oops moved
  RelocIterator iter(this, begin, end);
  while (iter.next()) {
    if (iter.type() == relocInfo::oop_type) {
      oop_Relocation* reloc = iter.oop_reloc();
      if (initialize_immediates && reloc->oop_is_immediate()) {
        oop* dest = reloc->oop_addr();
        initialize_immediate_oop(dest, (jobject) *dest);
      }
      // Refresh the oop-related bits of this instruction.
      reloc->fix_oop_relocation();
1083 1084 1085
    } else if (iter.type() == relocInfo::metadata_type) {
      metadata_Relocation* reloc = iter.metadata_reloc();
      reloc->fix_metadata_relocation();
1086 1087 1088 1089 1090
    }
  }
}


1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
void nmethod::verify_oop_relocations() {
  // Ensure sure that the code matches the current oop values
  RelocIterator iter(this, NULL, NULL);
  while (iter.next()) {
    if (iter.type() == relocInfo::oop_type) {
      oop_Relocation* reloc = iter.oop_reloc();
      if (!reloc->oop_is_immediate()) {
        reloc->verify_oop_relocation();
      }
    }
  }
}


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ScopeDesc* nmethod::scope_desc_at(address pc) {
  PcDesc* pd = pc_desc_at(pc);
  guarantee(pd != NULL, "scope must be present");
  return new ScopeDesc(this, pd->scope_decode_offset(),
1109 1110
                       pd->obj_decode_offset(), pd->should_reexecute(),
                       pd->return_oop());
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}


void nmethod::clear_inline_caches() {
  assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint");
  if (is_zombie()) {
    return;
  }

  RelocIterator iter(this);
  while (iter.next()) {
    iter.reloc()->clear_inline_cache();
  }
}


void nmethod::cleanup_inline_caches() {

1129
  assert_locked_or_safepoint(CompiledIC_lock);
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  // If the method is not entrant or zombie then a JMP is plastered over the
  // first few bytes.  If an oop in the old code was there, that oop
  // should not get GC'd.  Skip the first few bytes of oops on
  // not-entrant methods.
  address low_boundary = verified_entry_point();
  if (!is_in_use()) {
    low_boundary += NativeJump::instruction_size;
    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
    // This means that the low_boundary is going to be a little too high.
    // This shouldn't matter, since oops of non-entrant methods are never used.
    // In fact, why are we bothering to look at oops in a non-entrant method??
  }

  // Find all calls in an nmethod, and clear the ones that points to zombie methods
  ResourceMark rm;
  RelocIterator iter(this, low_boundary);
  while(iter.next()) {
    switch(iter.type()) {
      case relocInfo::virtual_call_type:
      case relocInfo::opt_virtual_call_type: {
        CompiledIC *ic = CompiledIC_at(iter.reloc());
        // Ok, to lookup references to zombies here
        CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination());
        if( cb != NULL && cb->is_nmethod() ) {
          nmethod* nm = (nmethod*)cb;
          // Clean inline caches pointing to both zombie and not_entrant methods
1157
          if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean();
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        }
        break;
      }
      case relocInfo::static_call_type: {
        CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc());
        CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination());
        if( cb != NULL && cb->is_nmethod() ) {
          nmethod* nm = (nmethod*)cb;
          // Clean inline caches pointing to both zombie and not_entrant methods
1167
          if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean();
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        }
        break;
      }
    }
  }
}

1175
// This is a private interface with the sweeper.
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void nmethod::mark_as_seen_on_stack() {
1177
  assert(is_alive(), "Must be an alive method");
1178 1179
  // Set the traversal mark to ensure that the sweeper does 2
  // cleaning passes before moving to zombie.
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  set_stack_traversal_mark(NMethodSweeper::traversal_count());
}

1183 1184 1185
// Tell if a non-entrant method can be converted to a zombie (i.e.,
// there are no activations on the stack, not in use by the VM,
// and not in use by the ServiceThread)
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bool nmethod::can_not_entrant_be_converted() {
  assert(is_not_entrant(), "must be a non-entrant method");

  // Since the nmethod sweeper only does partial sweep the sweeper's traversal
  // count can be greater than the stack traversal count before it hits the
  // nmethod for the second time.
1192 1193
  return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() &&
         !is_locked_by_vm();
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}

void nmethod::inc_decompile_count() {
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  if (!is_compiled_by_c2()) return;
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  // Could be gated by ProfileTraps, but do not bother...
1199
  Method* m = method();
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  if (m == NULL)  return;
1201
  MethodData* mdo = m->method_data();
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  if (mdo == NULL)  return;
1203
  // There is a benign race here.  See comments in methodData.hpp.
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  mdo->inc_decompile_count();
}

void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) {

  post_compiled_method_unload();

  // Since this nmethod is being unloaded, make sure that dependencies
  // recorded in instanceKlasses get flushed and pass non-NULL closure to
  // indicate that this work is being done during a GC.
  assert(Universe::heap()->is_gc_active(), "should only be called during gc");
  assert(is_alive != NULL, "Should be non-NULL");
  // A non-NULL is_alive closure indicates that this is being called during GC.
  flush_dependencies(is_alive);

  // Break cycle between nmethod & method
  if (TraceClassUnloading && WizardMode) {
    tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT
1222
                  " unloadable], Method*(" INTPTR_FORMAT
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                  "), cause(" INTPTR_FORMAT ")",
                  this, (address)_method, (address)cause);
1225 1226
    if (!Universe::heap()->is_gc_active())
      cause->klass()->print();
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  }
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  // Unlink the osr method, so we do not look this up again
  if (is_osr_method()) {
    invalidate_osr_method();
  }
1232
  // If _method is already NULL the Method* is about to be unloaded,
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  // so we don't have to break the cycle. Note that it is possible to
1234 1235
  // have the Method* live here, in case we unload the nmethod because
  // it is pointing to some oop (other than the Method*) being unloaded.
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  if (_method != NULL) {
1237
    // OSR methods point to the Method*, but the Method* does not
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    // point back!
    if (_method->code() == this) {
      _method->clear_code(); // Break a cycle
    }
    _method = NULL;            // Clear the method of this dead nmethod
  }
  // Make the class unloaded - i.e., change state and notify sweeper
1245
  assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
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  if (is_in_use()) {
    // Transitioning directly from live to unloaded -- so
    // we need to force a cache clean-up; remember this
    // for later on.
    CodeCache::set_needs_cache_clean(true);
  }
1252
  _state = unloaded;
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1254 1255 1256
  // Log the unloading.
  log_state_change();

1257
  // The Method* is gone at this point
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  assert(_method == NULL, "Tautology");

1260 1261
  set_osr_link(NULL);
  //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods
1262
  NMethodSweeper::notify();
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}

void nmethod::invalidate_osr_method() {
  assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
  // Remove from list of active nmethods
  if (method() != NULL)
1269
    method()->method_holder()->remove_osr_nmethod(this);
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  // Set entry as invalid
  _entry_bci = InvalidOSREntryBci;
}

1274
void nmethod::log_state_change() const {
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  if (LogCompilation) {
    if (xtty != NULL) {
      ttyLocker ttyl;  // keep the following output all in one block
1278
      if (_state == unloaded) {
1279 1280 1281 1282 1283
        xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'",
                         os::current_thread_id());
      } else {
        xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s",
                         os::current_thread_id(),
1284
                         (_state == zombie ? " zombie='1'" : ""));
1285
      }
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      log_identity(xtty);
      xtty->stamp();
      xtty->end_elem();
    }
  }
1291
  if (PrintCompilation && _state != unloaded) {
1292
    print_on(tty, _state == zombie ? "made zombie" : "made not entrant");
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  }
}

// Common functionality for both make_not_entrant and make_zombie
1297
bool nmethod::make_not_entrant_or_zombie(unsigned int state) {
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  assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
1299
  assert(!is_zombie(), "should not already be a zombie");
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1301
  // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below.
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  nmethodLocker nml(this);
1303
  methodHandle the_method(method());
1304
  No_Safepoint_Verifier nsv;
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  // during patching, depending on the nmethod state we must notify the GC that
  // code has been unloaded, unregistering it. We cannot do this right while
  // holding the Patching_lock because we need to use the CodeCache_lock. This
  // would be prone to deadlocks.
  // This flag is used to remember whether we need to later lock and unregister.
  bool nmethod_needs_unregister = false;

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  {
1314 1315 1316 1317 1318 1319 1320 1321 1322
    // invalidate osr nmethod before acquiring the patching lock since
    // they both acquire leaf locks and we don't want a deadlock.
    // This logic is equivalent to the logic below for patching the
    // verified entry point of regular methods.
    if (is_osr_method()) {
      // this effectively makes the osr nmethod not entrant
      invalidate_osr_method();
    }

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    // Enter critical section.  Does not block for safepoint.
    MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1325

1326
    if (_state == state) {
1327 1328 1329 1330 1331
      // another thread already performed this transition so nothing
      // to do, but return false to indicate this.
      return false;
    }

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    // The caller can be calling the method statically or through an inline
    // cache call.
1334
    if (!is_osr_method() && !is_not_entrant()) {
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      NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
                  SharedRuntime::get_handle_wrong_method_stub());
    }

1339 1340 1341 1342 1343
    if (is_in_use()) {
      // It's a true state change, so mark the method as decompiled.
      // Do it only for transition from alive.
      inc_decompile_count();
    }
1344

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    // If the state is becoming a zombie, signal to unregister the nmethod with
    // the heap.
    // This nmethod may have already been unloaded during a full GC.
    if ((state == zombie) && !is_unloaded()) {
      nmethod_needs_unregister = true;
    }

1352 1353 1354 1355 1356 1357 1358 1359 1360
    // Must happen before state change. Otherwise we have a race condition in
    // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately
    // transition its state from 'not_entrant' to 'zombie' without having to wait
    // for stack scanning.
    if (state == not_entrant) {
      mark_as_seen_on_stack();
      OrderAccess::storestore();
    }

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    // Change state
1362
    _state = state;
1363 1364 1365 1366

    // Log the transition once
    log_state_change();

1367 1368 1369
    // Remove nmethod from method.
    // We need to check if both the _code and _from_compiled_code_entry_point
    // refer to this nmethod because there is a race in setting these two fields
1370
    // in Method* as seen in bugid 4947125.
1371 1372 1373 1374 1375 1376 1377 1378
    // If the vep() points to the zombie nmethod, the memory for the nmethod
    // could be flushed and the compiler and vtable stubs could still call
    // through it.
    if (method() != NULL && (method()->code() == this ||
                             method()->from_compiled_entry() == verified_entry_point())) {
      HandleMark hm;
      method()->clear_code();
    }
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  } // leave critical region under Patching_lock

1381 1382 1383 1384 1385
  // When the nmethod becomes zombie it is no longer alive so the
  // dependencies must be flushed.  nmethods in the not_entrant
  // state will be flushed later when the transition to zombie
  // happens or they get unloaded.
  if (state == zombie) {
1386 1387 1388 1389 1390
    {
      // Flushing dependecies must be done before any possible
      // safepoint can sneak in, otherwise the oops used by the
      // dependency logic could have become stale.
      MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
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      if (nmethod_needs_unregister) {
        Universe::heap()->unregister_nmethod(this);
      }
1394 1395
      flush_dependencies(NULL);
    }
1396

1397 1398 1399 1400 1401 1402
    // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload
    // event and it hasn't already been reported for this nmethod then
    // report it now. The event may have been reported earilier if the GC
    // marked it for unloading). JvmtiDeferredEventQueue support means
    // we no longer go to a safepoint here.
    post_compiled_method_unload();
1403 1404 1405 1406 1407 1408

#ifdef ASSERT
    // It's no longer safe to access the oops section since zombie
    // nmethods aren't scanned for GC.
    _oops_are_stale = true;
#endif
1409 1410 1411
     // the Method may be reclaimed by class unloading now that the
     // nmethod is in zombie state
    set_method(NULL);
1412 1413 1414 1415
  } else {
    assert(state == not_entrant, "other cases may need to be handled differently");
  }

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  if (TraceCreateZombies) {
    tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie");
  }

  // Make sweeper aware that there is a zombie method that needs to be removed
1421
  NMethodSweeper::notify();
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1423
  return true;
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}

void nmethod::flush() {
  // Note that there are no valid oops in the nmethod anymore.
  assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method");
  assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation");

  assert (!is_locked_by_vm(), "locked methods shouldn't be flushed");
1432
  assert_locked_or_safepoint(CodeCache_lock);
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  // completely deallocate this method
1435
  Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this);
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  if (PrintMethodFlushing) {
1437 1438
    tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb",
        _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024);
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  }

  // We need to deallocate any ExceptionCache data.
  // Note that we do not need to grab the nmethod lock for this, it
  // better be thread safe if we're disposing of it!
  ExceptionCache* ec = exception_cache();
  set_exception_cache(NULL);
  while(ec != NULL) {
    ExceptionCache* next = ec->next();
    delete ec;
    ec = next;
  }

1452 1453 1454 1455
  if (on_scavenge_root_list()) {
    CodeCache::drop_scavenge_root_nmethod(this);
  }

1456
#ifdef SHARK
1457
  ((SharkCompiler *) compiler())->free_compiled_method(insts_begin());
1458 1459
#endif // SHARK

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  ((CodeBlob*)(this))->flush();

  CodeCache::free(this);
}


//
// Notify all classes this nmethod is dependent on that it is no
// longer dependent. This should only be called in two situations.
// First, when a nmethod transitions to a zombie all dependents need
// to be clear.  Since zombification happens at a safepoint there's no
// synchronization issues.  The second place is a little more tricky.
// During phase 1 of mark sweep class unloading may happen and as a
// result some nmethods may get unloaded.  In this case the flushing
// of dependencies must happen during phase 1 since after GC any
// dependencies in the unloaded nmethod won't be updated, so
// traversing the dependency information in unsafe.  In that case this
// function is called with a non-NULL argument and this function only
// notifies instanceKlasses that are reachable

void nmethod::flush_dependencies(BoolObjectClosure* is_alive) {
1481
  assert_locked_or_safepoint(CodeCache_lock);
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  assert(Universe::heap()->is_gc_active() == (is_alive != NULL),
  "is_alive is non-NULL if and only if we are called during GC");
  if (!has_flushed_dependencies()) {
    set_has_flushed_dependencies();
    for (Dependencies::DepStream deps(this); deps.next(); ) {
1487
      Klass* klass = deps.context_type();
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      if (klass == NULL)  continue;  // ignore things like evol_method

      // During GC the is_alive closure is non-NULL, and is used to
      // determine liveness of dependees that need to be updated.
1492 1493
      if (is_alive == NULL || klass->is_loader_alive(is_alive)) {
        InstanceKlass::cast(klass)->remove_dependent_nmethod(this);
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      }
    }
  }
}


// If this oop is not live, the nmethod can be unloaded.
1501
bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) {
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1502 1503 1504 1505 1506
  assert(root != NULL, "just checking");
  oop obj = *root;
  if (obj == NULL || is_alive->do_object_b(obj)) {
      return false;
  }
1507

1508 1509 1510 1511
  // If ScavengeRootsInCode is true, an nmethod might be unloaded
  // simply because one of its constant oops has gone dead.
  // No actual classes need to be unloaded in order for this to occur.
  assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading");
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  make_unloaded(is_alive, obj);
  return true;
}

// ------------------------------------------------------------------
// post_compiled_method_load_event
// new method for install_code() path
// Transfer information from compilation to jvmti
void nmethod::post_compiled_method_load_event() {

1522
  Method* moop = method();
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#ifndef USDT2
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1524 1525 1526 1527 1528 1529 1530
  HS_DTRACE_PROBE8(hotspot, compiled__method__load,
      moop->klass_name()->bytes(),
      moop->klass_name()->utf8_length(),
      moop->name()->bytes(),
      moop->name()->utf8_length(),
      moop->signature()->bytes(),
      moop->signature()->utf8_length(),
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1531
      insts_begin(), insts_size());
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1532 1533 1534 1535 1536 1537 1538 1539 1540 1541
#else /* USDT2 */
  HOTSPOT_COMPILED_METHOD_LOAD(
      (char *) moop->klass_name()->bytes(),
      moop->klass_name()->utf8_length(),
      (char *) moop->name()->bytes(),
      moop->name()->utf8_length(),
      (char *) moop->signature()->bytes(),
      moop->signature()->utf8_length(),
      insts_begin(), insts_size());
#endif /* USDT2 */
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1543 1544 1545 1546 1547
  if (JvmtiExport::should_post_compiled_method_load() ||
      JvmtiExport::should_post_compiled_method_unload()) {
    get_and_cache_jmethod_id();
  }

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  if (JvmtiExport::should_post_compiled_method_load()) {
1549 1550 1551 1552
    // Let the Service thread (which is a real Java thread) post the event
    MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
    JvmtiDeferredEventQueue::enqueue(
      JvmtiDeferredEvent::compiled_method_load_event(this));
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1553 1554 1555
  }
}

1556 1557 1558 1559 1560 1561 1562 1563 1564
jmethodID nmethod::get_and_cache_jmethod_id() {
  if (_jmethod_id == NULL) {
    // Cache the jmethod_id since it can no longer be looked up once the
    // method itself has been marked for unloading.
    _jmethod_id = method()->jmethod_id();
  }
  return _jmethod_id;
}

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void nmethod::post_compiled_method_unload() {
1566 1567 1568 1569 1570 1571
  if (unload_reported()) {
    // During unloading we transition to unloaded and then to zombie
    // and the unloading is reported during the first transition.
    return;
  }

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1572 1573 1574 1575
  assert(_method != NULL && !is_unloaded(), "just checking");
  DTRACE_METHOD_UNLOAD_PROBE(method());

  // If a JVMTI agent has enabled the CompiledMethodUnload event then
1576
  // post the event. Sometime later this nmethod will be made a zombie
1577
  // by the sweeper but the Method* will not be valid at that point.
1578 1579
  // If the _jmethod_id is null then no load event was ever requested
  // so don't bother posting the unload.  The main reason for this is
1580
  // that the jmethodID is a weak reference to the Method* so if
1581 1582 1583
  // it's being unloaded there's no way to look it up since the weak
  // ref will have been cleared.
  if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) {
D
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1584
    assert(!unload_reported(), "already unloaded");
1585
    JvmtiDeferredEvent event =
1586
      JvmtiDeferredEvent::compiled_method_unload_event(this,
1587 1588 1589 1590 1591 1592 1593 1594 1595
          _jmethod_id, insts_begin());
    if (SafepointSynchronize::is_at_safepoint()) {
      // Don't want to take the queueing lock. Add it as pending and
      // it will get enqueued later.
      JvmtiDeferredEventQueue::add_pending_event(event);
    } else {
      MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
      JvmtiDeferredEventQueue::enqueue(event);
    }
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  }

  // The JVMTI CompiledMethodUnload event can be enabled or disabled at
  // any time. As the nmethod is being unloaded now we mark it has
  // having the unload event reported - this will ensure that we don't
  // attempt to report the event in the unlikely scenario where the
  // event is enabled at the time the nmethod is made a zombie.
  set_unload_reported();
}

// This is called at the end of the strong tracing/marking phase of a
// GC to unload an nmethod if it contains otherwise unreachable
// oops.

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void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
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  // Make sure the oop's ready to receive visitors
  assert(!is_zombie() && !is_unloaded(),
         "should not call follow on zombie or unloaded nmethod");

  // If the method is not entrant then a JMP is plastered over the
  // first few bytes.  If an oop in the old code was there, that oop
  // should not get GC'd.  Skip the first few bytes of oops on
  // not-entrant methods.
  address low_boundary = verified_entry_point();
  if (is_not_entrant()) {
    low_boundary += NativeJump::instruction_size;
    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
    // (See comment above.)
  }

  // The RedefineClasses() API can cause the class unloading invariant
  // to no longer be true. See jvmtiExport.hpp for details.
  // Also, leave a debugging breadcrumb in local flag.
  bool a_class_was_redefined = JvmtiExport::has_redefined_a_class();
  if (a_class_was_redefined) {
    // This set of the unloading_occurred flag is done before the
    // call to post_compiled_method_unload() so that the unloading
    // of this nmethod is reported.
    unloading_occurred = true;
  }

  // Exception cache
  ExceptionCache* ec = exception_cache();
  while (ec != NULL) {
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    Klass* ex_klass = ec->exception_type();
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    ExceptionCache* next_ec = ec->next();
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    if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) {
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      remove_from_exception_cache(ec);
    }
    ec = next_ec;
  }

  // If class unloading occurred we first iterate over all inline caches and
  // clear ICs where the cached oop is referring to an unloaded klass or method.
  // The remaining live cached oops will be traversed in the relocInfo::oop_type
  // iteration below.
  if (unloading_occurred) {
    RelocIterator iter(this, low_boundary);
    while(iter.next()) {
      if (iter.type() == relocInfo::virtual_call_type) {
        CompiledIC *ic = CompiledIC_at(iter.reloc());
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        if (ic->is_icholder_call()) {
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          // The only exception is compiledICHolder oops which may
          // yet be marked below. (We check this further below).
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          CompiledICHolder* cichk_oop = ic->cached_icholder();
          if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) &&
              cichk_oop->holder_klass()->is_loader_alive(is_alive)) {
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              continue;
            }
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        } else {
          Metadata* ic_oop = ic->cached_metadata();
          if (ic_oop != NULL) {
            if (ic_oop->is_klass()) {
              if (((Klass*)ic_oop)->is_loader_alive(is_alive)) {
                continue;
              }
            } else if (ic_oop->is_method()) {
              if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) {
                continue;
              }
            } else {
              ShouldNotReachHere();
            }
          }
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          }
          ic->set_to_clean();
      }
    }
  }

  // Compiled code
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  {
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  RelocIterator iter(this, low_boundary);
  while (iter.next()) {
    if (iter.type() == relocInfo::oop_type) {
      oop_Relocation* r = iter.oop_reloc();
      // In this loop, we must only traverse those oops directly embedded in
      // the code.  Other oops (oop_index>0) are seen as part of scopes_oops.
      assert(1 == (r->oop_is_immediate()) +
                  (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
             "oop must be found in exactly one place");
      if (r->oop_is_immediate() && r->oop_value() != NULL) {
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        if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) {
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          return;
        }
      }
    }
  }
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  }
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  // Scopes
  for (oop* p = oops_begin(); p < oops_end(); p++) {
    if (*p == Universe::non_oop_word())  continue;  // skip non-oops
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    if (can_unload(is_alive, p, unloading_occurred)) {
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      return;
    }
  }

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  // Ensure that all metadata is still alive
  verify_metadata_loaders(low_boundary, is_alive);
}

#ifdef ASSERT

class CheckClass : AllStatic {
  static BoolObjectClosure* _is_alive;

  // Check class_loader is alive for this bit of metadata.
  static void check_class(Metadata* md) {
    Klass* klass = NULL;
    if (md->is_klass()) {
      klass = ((Klass*)md);
    } else if (md->is_method()) {
      klass = ((Method*)md)->method_holder();
    } else if (md->is_methodData()) {
      klass = ((MethodData*)md)->method()->method_holder();
    } else {
      md->print();
      ShouldNotReachHere();
    }
    assert(klass->is_loader_alive(_is_alive), "must be alive");
  }
 public:
  static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) {
    assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint");
    _is_alive = is_alive;
    nm->metadata_do(check_class);
  }
};

// This is called during a safepoint so can use static data
BoolObjectClosure* CheckClass::_is_alive = NULL;
#endif // ASSERT


// Processing of oop references should have been sufficient to keep
// all strong references alive.  Any weak references should have been
// cleared as well.  Visit all the metadata and ensure that it's
// really alive.
void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) {
#ifdef ASSERT
    RelocIterator iter(this, low_boundary);
    while (iter.next()) {
    // static_stub_Relocations may have dangling references to
    // Method*s so trim them out here.  Otherwise it looks like
    // compiled code is maintaining a link to dead metadata.
    address static_call_addr = NULL;
    if (iter.type() == relocInfo::opt_virtual_call_type) {
      CompiledIC* cic = CompiledIC_at(iter.reloc());
      if (!cic->is_call_to_interpreted()) {
        static_call_addr = iter.addr();
      }
    } else if (iter.type() == relocInfo::static_call_type) {
      CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc());
      if (!csc->is_call_to_interpreted()) {
        static_call_addr = iter.addr();
      }
    }
    if (static_call_addr != NULL) {
      RelocIterator sciter(this, low_boundary);
      while (sciter.next()) {
        if (sciter.type() == relocInfo::static_stub_type &&
            sciter.static_stub_reloc()->static_call() == static_call_addr) {
          sciter.static_stub_reloc()->clear_inline_cache();
        }
      }
    }
  }
  // Check that the metadata embedded in the nmethod is alive
  CheckClass::do_check_class(is_alive, this);
#endif
}


// Iterate over metadata calling this function.   Used by RedefineClasses
void nmethod::metadata_do(void f(Metadata*)) {
  address low_boundary = verified_entry_point();
  if (is_not_entrant()) {
    low_boundary += NativeJump::instruction_size;
    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
    // (See comment above.)
  }
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  {
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    // Visit all immediate references that are embedded in the instruction stream.
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    RelocIterator iter(this, low_boundary);
    while (iter.next()) {
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      if (iter.type() == relocInfo::metadata_type ) {
        metadata_Relocation* r = iter.metadata_reloc();
        // In this lmetadata, we must only follow those metadatas directly embedded in
        // the code.  Other metadatas (oop_index>0) are seen as part of
        // the metadata section below.
        assert(1 == (r->metadata_is_immediate()) +
               (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
               "metadata must be found in exactly one place");
        if (r->metadata_is_immediate() && r->metadata_value() != NULL) {
          Metadata* md = r->metadata_value();
          f(md);
        }
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      } else if (iter.type() == relocInfo::virtual_call_type) {
        // Check compiledIC holders associated with this nmethod
        CompiledIC *ic = CompiledIC_at(iter.reloc());
        if (ic->is_icholder_call()) {
          CompiledICHolder* cichk = ic->cached_icholder();
          f(cichk->holder_method());
          f(cichk->holder_klass());
        } else {
          Metadata* ic_oop = ic->cached_metadata();
          if (ic_oop != NULL) {
            f(ic_oop);
          }
        }
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      }
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    }
  }
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  // Visit the metadata section
  for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
    if (*p == Universe::non_oop_word() || *p == NULL)  continue;  // skip non-oops
    Metadata* md = *p;
    f(md);
  }
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  // Call function Method*, not embedded in these other places.
  if (_method != NULL) f(_method);
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}

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void nmethod::oops_do(OopClosure* f, bool allow_zombie) {
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  // make sure the oops ready to receive visitors
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  assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod");
  assert(!is_unloaded(), "should not call follow on unloaded nmethod");
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  // If the method is not entrant or zombie then a JMP is plastered over the
  // first few bytes.  If an oop in the old code was there, that oop
  // should not get GC'd.  Skip the first few bytes of oops on
  // not-entrant methods.
  address low_boundary = verified_entry_point();
  if (is_not_entrant()) {
    low_boundary += NativeJump::instruction_size;
    // %%% Note:  On SPARC we patch only a 4-byte trap, not a full NativeJump.
    // (See comment above.)
  }

  RelocIterator iter(this, low_boundary);
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  while (iter.next()) {
    if (iter.type() == relocInfo::oop_type ) {
      oop_Relocation* r = iter.oop_reloc();
      // In this loop, we must only follow those oops directly embedded in
      // the code.  Other oops (oop_index>0) are seen as part of scopes_oops.
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      assert(1 == (r->oop_is_immediate()) +
                   (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
             "oop must be found in exactly one place");
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      if (r->oop_is_immediate() && r->oop_value() != NULL) {
        f->do_oop(r->oop_addr());
      }
    }
  }

  // Scopes
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  // This includes oop constants not inlined in the code stream.
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  for (oop* p = oops_begin(); p < oops_end(); p++) {
    if (*p == Universe::non_oop_word())  continue;  // skip non-oops
    f->do_oop(p);
  }
}

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#define NMETHOD_SENTINEL ((nmethod*)badAddress)

nmethod* volatile nmethod::_oops_do_mark_nmethods;

// An nmethod is "marked" if its _mark_link is set non-null.
// Even if it is the end of the linked list, it will have a non-null link value,
// as long as it is on the list.
// This code must be MP safe, because it is used from parallel GC passes.
bool nmethod::test_set_oops_do_mark() {
  assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
  nmethod* observed_mark_link = _oops_do_mark_link;
  if (observed_mark_link == NULL) {
    // Claim this nmethod for this thread to mark.
    observed_mark_link = (nmethod*)
      Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL);
    if (observed_mark_link == NULL) {

      // Atomically append this nmethod (now claimed) to the head of the list:
      nmethod* observed_mark_nmethods = _oops_do_mark_nmethods;
      for (;;) {
        nmethod* required_mark_nmethods = observed_mark_nmethods;
        _oops_do_mark_link = required_mark_nmethods;
        observed_mark_nmethods = (nmethod*)
          Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods);
        if (observed_mark_nmethods == required_mark_nmethods)
          break;
      }
      // Mark was clear when we first saw this guy.
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      NOT_PRODUCT(if (TraceScavenge)  print_on(tty, "oops_do, mark"));
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      return false;
    }
  }
  // On fall through, another racing thread marked this nmethod before we did.
  return true;
}

void nmethod::oops_do_marking_prologue() {
  NOT_PRODUCT(if (TraceScavenge)  tty->print_cr("[oops_do_marking_prologue"));
  assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row");
  // We use cmpxchg_ptr instead of regular assignment here because the user
  // may fork a bunch of threads, and we need them all to see the same state.
  void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL);
  guarantee(observed == NULL, "no races in this sequential code");
}

void nmethod::oops_do_marking_epilogue() {
  assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row");
  nmethod* cur = _oops_do_mark_nmethods;
  while (cur != NMETHOD_SENTINEL) {
    assert(cur != NULL, "not NULL-terminated");
    nmethod* next = cur->_oops_do_mark_link;
    cur->_oops_do_mark_link = NULL;
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    cur->fix_oop_relocations();
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    NOT_PRODUCT(if (TraceScavenge)  cur->print_on(tty, "oops_do, unmark"));
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    cur = next;
  }
  void* required = _oops_do_mark_nmethods;
  void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);
  guarantee(observed == required, "no races in this sequential code");
  NOT_PRODUCT(if (TraceScavenge)  tty->print_cr("oops_do_marking_epilogue]"));
}

class DetectScavengeRoot: public OopClosure {
  bool     _detected_scavenge_root;
public:
  DetectScavengeRoot() : _detected_scavenge_root(false)
  { NOT_PRODUCT(_print_nm = NULL); }
  bool detected_scavenge_root() { return _detected_scavenge_root; }
  virtual void do_oop(oop* p) {
    if ((*p) != NULL && (*p)->is_scavengable()) {
      NOT_PRODUCT(maybe_print(p));
      _detected_scavenge_root = true;
    }
  }
  virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }

#ifndef PRODUCT
  nmethod* _print_nm;
  void maybe_print(oop* p) {
    if (_print_nm == NULL)  return;
    if (!_detected_scavenge_root)  _print_nm->print_on(tty, "new scavenge root");
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    tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")",
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                  _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm),
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                  (void *)(*p), (intptr_t)p);
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    (*p)->print();
  }
#endif //PRODUCT
};

bool nmethod::detect_scavenge_root_oops() {
  DetectScavengeRoot detect_scavenge_root;
  NOT_PRODUCT(if (TraceScavenge)  detect_scavenge_root._print_nm = this);
  oops_do(&detect_scavenge_root);
  return detect_scavenge_root.detected_scavenge_root();
}

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// Method that knows how to preserve outgoing arguments at call. This method must be
// called with a frame corresponding to a Java invoke
void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
1982
#ifndef SHARK
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  if (!method()->is_native()) {
    SimpleScopeDesc ssd(this, fr.pc());
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    Bytecode_invoke call(ssd.method(), ssd.bci());
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    bool has_receiver = call.has_receiver();
    bool has_appendix = call.has_appendix();
1988
    Symbol* signature = call.signature();
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    fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
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  }
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#endif // !SHARK
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}


oop nmethod::embeddedOop_at(u_char* p) {
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  RelocIterator iter(this, p, p + 1);
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  while (iter.next())
    if (iter.type() == relocInfo::oop_type) {
      return iter.oop_reloc()->oop_value();
    }
  return NULL;
}


inline bool includes(void* p, void* from, void* to) {
  return from <= p && p < to;
}


void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
  assert(count >= 2, "must be sentinel values, at least");

#ifdef ASSERT
  // must be sorted and unique; we do a binary search in find_pc_desc()
  int prev_offset = pcs[0].pc_offset();
  assert(prev_offset == PcDesc::lower_offset_limit,
         "must start with a sentinel");
  for (int i = 1; i < count; i++) {
    int this_offset = pcs[i].pc_offset();
    assert(this_offset > prev_offset, "offsets must be sorted");
    prev_offset = this_offset;
  }
  assert(prev_offset == PcDesc::upper_offset_limit,
         "must end with a sentinel");
#endif //ASSERT

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  // Search for MethodHandle invokes and tag the nmethod.
  for (int i = 0; i < count; i++) {
    if (pcs[i].is_method_handle_invoke()) {
      set_has_method_handle_invokes(true);
      break;
    }
  }
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  assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler");
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  int size = count * sizeof(PcDesc);
  assert(scopes_pcs_size() >= size, "oob");
  memcpy(scopes_pcs_begin(), pcs, size);

  // Adjust the final sentinel downward.
  PcDesc* last_pc = &scopes_pcs_begin()[count-1];
  assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
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  last_pc->set_pc_offset(content_size() + 1);
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  for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
    // Fill any rounding gaps with copies of the last record.
    last_pc[1] = last_pc[0];
  }
  // The following assert could fail if sizeof(PcDesc) is not
  // an integral multiple of oopSize (the rounding term).
  // If it fails, change the logic to always allocate a multiple
  // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
  assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
}

void nmethod::copy_scopes_data(u_char* buffer, int size) {
  assert(scopes_data_size() >= size, "oob");
  memcpy(scopes_data_begin(), buffer, size);
}


#ifdef ASSERT
static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) {
  PcDesc* lower = nm->scopes_pcs_begin();
  PcDesc* upper = nm->scopes_pcs_end();
  lower += 1; // exclude initial sentinel
  PcDesc* res = NULL;
  for (PcDesc* p = lower; p < upper; p++) {
    NOT_PRODUCT(--nmethod_stats.pc_desc_tests);  // don't count this call to match_desc
    if (match_desc(p, pc_offset, approximate)) {
      if (res == NULL)
        res = p;
      else
        res = (PcDesc*) badAddress;
    }
  }
  return res;
}
#endif


// Finds a PcDesc with real-pc equal to "pc"
PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) {
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  address base_address = code_begin();
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  if ((pc < base_address) ||
      (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
    return NULL;  // PC is wildly out of range
  }
  int pc_offset = (int) (pc - base_address);

  // Check the PcDesc cache if it contains the desired PcDesc
  // (This as an almost 100% hit rate.)
  PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
  if (res != NULL) {
    assert(res == linear_search(this, pc_offset, approximate), "cache ok");
    return res;
  }

  // Fallback algorithm: quasi-linear search for the PcDesc
  // Find the last pc_offset less than the given offset.
  // The successor must be the required match, if there is a match at all.
  // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
  PcDesc* lower = scopes_pcs_begin();
  PcDesc* upper = scopes_pcs_end();
  upper -= 1; // exclude final sentinel
  if (lower >= upper)  return NULL;  // native method; no PcDescs at all

#define assert_LU_OK \
  /* invariant on lower..upper during the following search: */ \
  assert(lower->pc_offset() <  pc_offset, "sanity"); \
  assert(upper->pc_offset() >= pc_offset, "sanity")
  assert_LU_OK;

  // Use the last successful return as a split point.
  PcDesc* mid = _pc_desc_cache.last_pc_desc();
  NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
  if (mid->pc_offset() < pc_offset) {
    lower = mid;
  } else {
    upper = mid;
  }

  // Take giant steps at first (4096, then 256, then 16, then 1)
  const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
  const int RADIX = (1 << LOG2_RADIX);
  for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
    while ((mid = lower + step) < upper) {
      assert_LU_OK;
      NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
      if (mid->pc_offset() < pc_offset) {
        lower = mid;
      } else {
        upper = mid;
        break;
      }
    }
    assert_LU_OK;
  }

  // Sneak up on the value with a linear search of length ~16.
  while (true) {
    assert_LU_OK;
    mid = lower + 1;
    NOT_PRODUCT(++nmethod_stats.pc_desc_searches);
    if (mid->pc_offset() < pc_offset) {
      lower = mid;
    } else {
      upper = mid;
      break;
    }
  }
#undef assert_LU_OK

  if (match_desc(upper, pc_offset, approximate)) {
    assert(upper == linear_search(this, pc_offset, approximate), "search ok");
    _pc_desc_cache.add_pc_desc(upper);
    return upper;
  } else {
    assert(NULL == linear_search(this, pc_offset, approximate), "search ok");
    return NULL;
  }
}


bool nmethod::check_all_dependencies() {
  bool found_check = false;
  // wholesale check of all dependencies
  for (Dependencies::DepStream deps(this); deps.next(); ) {
    if (deps.check_dependency() != NULL) {
      found_check = true;
      NOT_DEBUG(break);
    }
  }
  return found_check;  // tell caller if we found anything
}

bool nmethod::check_dependency_on(DepChange& changes) {
  // What has happened:
  // 1) a new class dependee has been added
  // 2) dependee and all its super classes have been marked
  bool found_check = false;  // set true if we are upset
  for (Dependencies::DepStream deps(this); deps.next(); ) {
    // Evaluate only relevant dependencies.
    if (deps.spot_check_dependency_at(changes) != NULL) {
      found_check = true;
      NOT_DEBUG(break);
    }
  }
  return found_check;
}

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bool nmethod::is_evol_dependent_on(Klass* dependee) {
  InstanceKlass *dependee_ik = InstanceKlass::cast(dependee);
  Array<Method*>* dependee_methods = dependee_ik->methods();
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  for (Dependencies::DepStream deps(this); deps.next(); ) {
    if (deps.type() == Dependencies::evol_method) {
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      Method* method = deps.method_argument(0);
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      for (int j = 0; j < dependee_methods->length(); j++) {
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        if (dependee_methods->at(j) == method) {
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          // RC_TRACE macro has an embedded ResourceMark
          RC_TRACE(0x01000000,
            ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)",
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            _method->method_holder()->external_name(),
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            _method->name()->as_C_string(),
            _method->signature()->as_C_string(), compile_id(),
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            method->method_holder()->external_name(),
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            method->name()->as_C_string(),
            method->signature()->as_C_string()));
          if (TraceDependencies || LogCompilation)
            deps.log_dependency(dependee);
          return true;
        }
      }
    }
  }
  return false;
}

// Called from mark_for_deoptimization, when dependee is invalidated.
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bool nmethod::is_dependent_on_method(Method* dependee) {
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  for (Dependencies::DepStream deps(this); deps.next(); ) {
    if (deps.type() != Dependencies::evol_method)
      continue;
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    Method* method = deps.method_argument(0);
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    if (method == dependee) return true;
  }
  return false;
}


bool nmethod::is_patchable_at(address instr_addr) {
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  assert(insts_contains(instr_addr), "wrong nmethod used");
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  if (is_zombie()) {
    // a zombie may never be patched
    return false;
  }
  return true;
}


address nmethod::continuation_for_implicit_exception(address pc) {
  // Exception happened outside inline-cache check code => we are inside
  // an active nmethod => use cpc to determine a return address
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  int exception_offset = pc - code_begin();
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  int cont_offset = ImplicitExceptionTable(this).at( exception_offset );
#ifdef ASSERT
  if (cont_offset == 0) {
    Thread* thread = ThreadLocalStorage::get_thread_slow();
    ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
    HandleMark hm(thread);
    ResourceMark rm(thread);
    CodeBlob* cb = CodeCache::find_blob(pc);
    assert(cb != NULL && cb == this, "");
    tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc);
    print();
    method()->print_codes();
    print_code();
    print_pcs();
  }
#endif
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  if (cont_offset == 0) {
    // Let the normal error handling report the exception
    return NULL;
  }
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  return code_begin() + cont_offset;
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}



void nmethod_init() {
  // make sure you didn't forget to adjust the filler fields
  assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
}


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


// QQQ might we make this work from a frame??
nmethodLocker::nmethodLocker(address pc) {
  CodeBlob* cb = CodeCache::find_blob(pc);
  guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found");
  _nm = (nmethod*)cb;
  lock_nmethod(_nm);
}

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// Only JvmtiDeferredEvent::compiled_method_unload_event()
// should pass zombie_ok == true.
void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) {
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  if (nm == NULL)  return;
  Atomic::inc(&nm->_lock_count);
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  guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method");
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}

void nmethodLocker::unlock_nmethod(nmethod* nm) {
  if (nm == NULL)  return;
  Atomic::dec(&nm->_lock_count);
  guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock");
}

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// -----------------------------------------------------------------------------
// nmethod::get_deopt_original_pc
//
// Return the original PC for the given PC if:
// (a) the given PC belongs to a nmethod and
// (b) it is a deopt PC
address nmethod::get_deopt_original_pc(const frame* fr) {
  if (fr->cb() == NULL)  return NULL;

  nmethod* nm = fr->cb()->as_nmethod_or_null();
  if (nm != NULL && nm->is_deopt_pc(fr->pc()))
    return nm->get_original_pc(fr);

  return NULL;
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}


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// -----------------------------------------------------------------------------
// MethodHandle

bool nmethod::is_method_handle_return(address return_pc) {
  if (!has_method_handle_invokes())  return false;
  PcDesc* pd = pc_desc_at(return_pc);
  if (pd == NULL)
    return false;
  return pd->is_method_handle_invoke();
}


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// -----------------------------------------------------------------------------
// Verification

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class VerifyOopsClosure: public OopClosure {
  nmethod* _nm;
  bool     _ok;
public:
  VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
  bool ok() { return _ok; }
  virtual void do_oop(oop* p) {
    if ((*p) == NULL || (*p)->is_oop())  return;
    if (_ok) {
      _nm->print_nmethod(true);
      _ok = false;
    }
    tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
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                  (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
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  }
  virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
};

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void nmethod::verify() {

  // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant
  // seems odd.

  if( is_zombie() || is_not_entrant() )
    return;

  // Make sure all the entry points are correctly aligned for patching.
  NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());

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  // assert(method()->is_oop(), "must be valid");
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  ResourceMark rm;

  if (!CodeCache::contains(this)) {
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    fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this));
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  }

  if(is_native_method() )
    return;

  nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
  if (nm != this) {
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    fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")",
                  this));
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  }

  for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
    if (! p->verify(this)) {
      tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this);
    }
  }

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  VerifyOopsClosure voc(this);
  oops_do(&voc);
  assert(voc.ok(), "embedded oops must be OK");
  verify_scavenge_root_oops();

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  verify_scopes();
}


void nmethod::verify_interrupt_point(address call_site) {
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  // Verify IC only when nmethod installation is finished.
  bool is_installed = (method()->code() == this) // nmethod is in state 'alive' and installed
                      || !this->is_in_use();     // nmethod is installed, but not in 'alive' state
  if (is_installed) {
    Thread *cur = Thread::current();
    if (CompiledIC_lock->owner() == cur ||
        ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) &&
         SafepointSynchronize::is_at_safepoint())) {
      CompiledIC_at(this, call_site);
      CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
    } else {
      MutexLocker ml_verify (CompiledIC_lock);
      CompiledIC_at(this, call_site);
    }
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  }
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  PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
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  assert(pd != NULL, "PcDesc must exist");
  for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(),
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                                     pd->obj_decode_offset(), pd->should_reexecute(),
                                     pd->return_oop());
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       !sd->is_top(); sd = sd->sender()) {
    sd->verify();
  }
}

void nmethod::verify_scopes() {
  if( !method() ) return;       // Runtime stubs have no scope
  if (method()->is_native()) return; // Ignore stub methods.
  // iterate through all interrupt point
  // and verify the debug information is valid.
  RelocIterator iter((nmethod*)this);
  while (iter.next()) {
    address stub = NULL;
    switch (iter.type()) {
      case relocInfo::virtual_call_type:
        verify_interrupt_point(iter.addr());
        break;
      case relocInfo::opt_virtual_call_type:
        stub = iter.opt_virtual_call_reloc()->static_stub();
        verify_interrupt_point(iter.addr());
        break;
      case relocInfo::static_call_type:
        stub = iter.static_call_reloc()->static_stub();
        //verify_interrupt_point(iter.addr());
        break;
      case relocInfo::runtime_call_type:
        address destination = iter.reloc()->value();
        // Right now there is no way to find out which entries support
        // an interrupt point.  It would be nice if we had this
        // information in a table.
        break;
    }
    assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
  }
}


// -----------------------------------------------------------------------------
// Non-product code
#ifndef PRODUCT

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class DebugScavengeRoot: public OopClosure {
  nmethod* _nm;
  bool     _ok;
public:
  DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { }
  bool ok() { return _ok; }
  virtual void do_oop(oop* p) {
    if ((*p) == NULL || !(*p)->is_scavengable())  return;
    if (_ok) {
      _nm->print_nmethod(true);
      _ok = false;
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    }
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    tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)",
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                  (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm));
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    (*p)->print();
  }
  virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
};

void nmethod::verify_scavenge_root_oops() {
  if (!on_scavenge_root_list()) {
    // Actually look inside, to verify the claim that it's clean.
    DebugScavengeRoot debug_scavenge_root(this);
    oops_do(&debug_scavenge_root);
    if (!debug_scavenge_root.ok())
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      fatal("found an unadvertised bad scavengable oop in the code cache");
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  }
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  assert(scavenge_root_not_marked(), "");
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}

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#endif // PRODUCT
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// Printing operations

void nmethod::print() const {
  ResourceMark rm;
  ttyLocker ttyl;   // keep the following output all in one block

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  tty->print("Compiled method ");
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  if (is_compiled_by_c1()) {
    tty->print("(c1) ");
  } else if (is_compiled_by_c2()) {
    tty->print("(c2) ");
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  } else if (is_compiled_by_shark()) {
    tty->print("(shark) ");
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  } else {
    tty->print("(nm) ");
  }

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  print_on(tty, NULL);

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  if (WizardMode) {
    tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
    tty->print(" for method " INTPTR_FORMAT , (address)method());
    tty->print(" { ");
    if (is_in_use())      tty->print("in_use ");
    if (is_not_entrant()) tty->print("not_entrant ");
    if (is_zombie())      tty->print("zombie ");
    if (is_unloaded())    tty->print("unloaded ");
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    if (on_scavenge_root_list())  tty->print("scavenge_root ");
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    tty->print_cr("}:");
  }
  if (size              () > 0) tty->print_cr(" total in heap  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              (address)this,
                                              (address)this + size(),
                                              size());
  if (relocation_size   () > 0) tty->print_cr(" relocation     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              relocation_begin(),
                                              relocation_end(),
                                              relocation_size());
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  if (consts_size       () > 0) tty->print_cr(" constants      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              consts_begin(),
                                              consts_end(),
                                              consts_size());
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  if (insts_size        () > 0) tty->print_cr(" main code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              insts_begin(),
                                              insts_end(),
                                              insts_size());
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  if (stub_size         () > 0) tty->print_cr(" stub code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              stub_begin(),
                                              stub_end(),
                                              stub_size());
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  if (oops_size         () > 0) tty->print_cr(" oops           [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              oops_begin(),
                                              oops_end(),
                                              oops_size());
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  if (metadata_size      () > 0) tty->print_cr(" metadata       [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              metadata_begin(),
                                              metadata_end(),
                                              metadata_size());
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  if (scopes_data_size  () > 0) tty->print_cr(" scopes data    [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              scopes_data_begin(),
                                              scopes_data_end(),
                                              scopes_data_size());
  if (scopes_pcs_size   () > 0) tty->print_cr(" scopes pcs     [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              scopes_pcs_begin(),
                                              scopes_pcs_end(),
                                              scopes_pcs_size());
  if (dependencies_size () > 0) tty->print_cr(" dependencies   [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              dependencies_begin(),
                                              dependencies_end(),
                                              dependencies_size());
  if (handler_table_size() > 0) tty->print_cr(" handler table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              handler_table_begin(),
                                              handler_table_end(),
                                              handler_table_size());
  if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table  [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
                                              nul_chk_table_begin(),
                                              nul_chk_table_end(),
                                              nul_chk_table_size());
}

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void nmethod::print_code() {
  HandleMark hm;
  ResourceMark m;
  Disassembler::decode(this);
}


#ifndef PRODUCT
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void nmethod::print_scopes() {
  // Find the first pc desc for all scopes in the code and print it.
  ResourceMark rm;
  for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
    if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
      continue;

    ScopeDesc* sd = scope_desc_at(p->real_pc(this));
    sd->print_on(tty, p);
  }
}

void nmethod::print_dependencies() {
  ResourceMark rm;
  ttyLocker ttyl;   // keep the following output all in one block
  tty->print_cr("Dependencies:");
  for (Dependencies::DepStream deps(this); deps.next(); ) {
    deps.print_dependency();
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    Klass* ctxk = deps.context_type();
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    if (ctxk != NULL) {
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      if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) {
        tty->print_cr("   [nmethod<=klass]%s", ctxk->external_name());
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      }
    }
    deps.log_dependency();  // put it into the xml log also
  }
}


void nmethod::print_relocations() {
  ResourceMark m;       // in case methods get printed via the debugger
  tty->print_cr("relocations:");
  RelocIterator iter(this);
  iter.print();
  if (UseRelocIndex) {
    jint* index_end   = (jint*)relocation_end() - 1;
    jint  index_size  = *index_end;
    jint* index_start = (jint*)( (address)index_end - index_size );
    tty->print_cr("    index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size);
    if (index_size > 0) {
      jint* ip;
      for (ip = index_start; ip+2 <= index_end; ip += 2)
        tty->print_cr("  (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT,
                      ip[0],
                      ip[1],
                      header_end()+ip[0],
                      relocation_begin()-1+ip[1]);
      for (; ip < index_end; ip++)
        tty->print_cr("  (%d ?)", ip[0]);
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      tty->print_cr("          @" INTPTR_FORMAT ": index_size=%d", ip, *ip);
      ip++;
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      tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip);
    }
  }
}


void nmethod::print_pcs() {
  ResourceMark m;       // in case methods get printed via debugger
  tty->print_cr("pc-bytecode offsets:");
  for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
    p->print(this);
  }
}

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#endif // PRODUCT
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const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
  RelocIterator iter(this, begin, end);
  bool have_one = false;
  while (iter.next()) {
    have_one = true;
    switch (iter.type()) {
        case relocInfo::none:                  return "no_reloc";
        case relocInfo::oop_type: {
          stringStream st;
          oop_Relocation* r = iter.oop_reloc();
          oop obj = r->oop_value();
          st.print("oop(");
          if (obj == NULL) st.print("NULL");
          else obj->print_value_on(&st);
          st.print(")");
          return st.as_string();
        }
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        case relocInfo::metadata_type: {
          stringStream st;
          metadata_Relocation* r = iter.metadata_reloc();
          Metadata* obj = r->metadata_value();
          st.print("metadata(");
          if (obj == NULL) st.print("NULL");
          else obj->print_value_on(&st);
          st.print(")");
          return st.as_string();
        }
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        case relocInfo::virtual_call_type:     return "virtual_call";
        case relocInfo::opt_virtual_call_type: return "optimized virtual_call";
        case relocInfo::static_call_type:      return "static_call";
        case relocInfo::static_stub_type:      return "static_stub";
        case relocInfo::runtime_call_type:     return "runtime_call";
        case relocInfo::external_word_type:    return "external_word";
        case relocInfo::internal_word_type:    return "internal_word";
        case relocInfo::section_word_type:     return "section_word";
        case relocInfo::poll_type:             return "poll";
        case relocInfo::poll_return_type:      return "poll_return";
        case relocInfo::type_mask:             return "type_bit_mask";
    }
  }
  return have_one ? "other" : NULL;
}

// Return a the last scope in (begin..end]
ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
  PcDesc* p = pc_desc_near(begin+1);
  if (p != NULL && p->real_pc(this) <= end) {
    return new ScopeDesc(this, p->scope_decode_offset(),
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                         p->obj_decode_offset(), p->should_reexecute(),
                         p->return_oop());
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  }
  return NULL;
}

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void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const {
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  if (block_begin == entry_point())             stream->print_cr("[Entry Point]");
  if (block_begin == verified_entry_point())    stream->print_cr("[Verified Entry Point]");
  if (block_begin == exception_begin())         stream->print_cr("[Exception Handler]");
  if (block_begin == stub_begin())              stream->print_cr("[Stub Code]");
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  if (block_begin == deopt_handler_begin())     stream->print_cr("[Deopt Handler Code]");
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  if (has_method_handle_invokes())
    if (block_begin == deopt_mh_handler_begin())  stream->print_cr("[Deopt MH Handler Code]");

2710
  if (block_begin == consts_begin())            stream->print_cr("[Constants]");
2711

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  if (block_begin == entry_point()) {
    methodHandle m = method();
    if (m.not_null()) {
      stream->print("  # ");
      m->print_value_on(stream);
      stream->cr();
    }
    if (m.not_null() && !is_osr_method()) {
      ResourceMark rm;
      int sizeargs = m->size_of_parameters();
      BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
      VMRegPair* regs   = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
      {
        int sig_index = 0;
        if (!m->is_static())
          sig_bt[sig_index++] = T_OBJECT; // 'this'
        for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
          BasicType t = ss.type();
          sig_bt[sig_index++] = t;
          if (type2size[t] == 2) {
            sig_bt[sig_index++] = T_VOID;
          } else {
            assert(type2size[t] == 1, "size is 1 or 2");
          }
        }
        assert(sig_index == sizeargs, "");
      }
      const char* spname = "sp"; // make arch-specific?
      intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false);
      int stack_slot_offset = this->frame_size() * wordSize;
      int tab1 = 14, tab2 = 24;
      int sig_index = 0;
      int arg_index = (m->is_static() ? 0 : -1);
      bool did_old_sp = false;
      for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
        bool at_this = (arg_index == -1);
        bool at_old_sp = false;
        BasicType t = (at_this ? T_OBJECT : ss.type());
        assert(t == sig_bt[sig_index], "sigs in sync");
        if (at_this)
          stream->print("  # this: ");
        else
          stream->print("  # parm%d: ", arg_index);
        stream->move_to(tab1);
        VMReg fst = regs[sig_index].first();
        VMReg snd = regs[sig_index].second();
        if (fst->is_reg()) {
          stream->print("%s", fst->name());
          if (snd->is_valid())  {
            stream->print(":%s", snd->name());
          }
        } else if (fst->is_stack()) {
          int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
          if (offset == stack_slot_offset)  at_old_sp = true;
          stream->print("[%s+0x%x]", spname, offset);
        } else {
          stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
        }
        stream->print(" ");
        stream->move_to(tab2);
        stream->print("= ");
        if (at_this) {
          m->method_holder()->print_value_on(stream);
        } else {
          bool did_name = false;
          if (!at_this && ss.is_object()) {
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            Symbol* name = ss.as_symbol_or_null();
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            if (name != NULL) {
              name->print_value_on(stream);
              did_name = true;
            }
          }
          if (!did_name)
            stream->print("%s", type2name(t));
        }
        if (at_old_sp) {
          stream->print("  (%s of caller)", spname);
          did_old_sp = true;
        }
        stream->cr();
        sig_index += type2size[t];
        arg_index += 1;
        if (!at_this)  ss.next();
      }
      if (!did_old_sp) {
        stream->print("  # ");
        stream->move_to(tab1);
        stream->print("[%s+0x%x]", spname, stack_slot_offset);
        stream->print("  (%s of caller)", spname);
        stream->cr();
      }
    }
  }
}

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void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) {
  // First, find an oopmap in (begin, end].
  // We use the odd half-closed interval so that oop maps and scope descs
  // which are tied to the byte after a call are printed with the call itself.
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  address base = code_begin();
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  OopMapSet* oms = oop_maps();
  if (oms != NULL) {
    for (int i = 0, imax = oms->size(); i < imax; i++) {
      OopMap* om = oms->at(i);
      address pc = base + om->offset();
      if (pc > begin) {
        if (pc <= end) {
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          st->move_to(column);
          st->print("; ");
          om->print_on(st);
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        }
        break;
      }
    }
  }
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  // Print any debug info present at this pc.
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  ScopeDesc* sd  = scope_desc_in(begin, end);
  if (sd != NULL) {
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    st->move_to(column);
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    if (sd->bci() == SynchronizationEntryBCI) {
      st->print(";*synchronization entry");
    } else {
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      if (sd->method() == NULL) {
2836
        st->print("method is NULL");
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      } else if (sd->method()->is_native()) {
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        st->print("method is native");
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      } else {
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        Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
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        st->print(";*%s", Bytecodes::name(bc));
        switch (bc) {
        case Bytecodes::_invokevirtual:
        case Bytecodes::_invokespecial:
        case Bytecodes::_invokestatic:
        case Bytecodes::_invokeinterface:
          {
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            Bytecode_invoke invoke(sd->method(), sd->bci());
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            st->print(" ");
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            if (invoke.name() != NULL)
              invoke.name()->print_symbol_on(st);
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            else
              st->print("<UNKNOWN>");
            break;
          }
        case Bytecodes::_getfield:
        case Bytecodes::_putfield:
        case Bytecodes::_getstatic:
        case Bytecodes::_putstatic:
          {
2861
            Bytecode_field field(sd->method(), sd->bci());
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            st->print(" ");
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            if (field.name() != NULL)
              field.name()->print_symbol_on(st);
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            else
              st->print("<UNKNOWN>");
          }
        }
      }
    }
2871

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    // Print all scopes
    for (;sd != NULL; sd = sd->sender()) {
2874
      st->move_to(column);
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      st->print("; -");
2876
      if (sd->method() == NULL) {
2877
        st->print("method is NULL");
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      } else {
        sd->method()->print_short_name(st);
      }
      int lineno = sd->method()->line_number_from_bci(sd->bci());
      if (lineno != -1) {
        st->print("@%d (line %d)", sd->bci(), lineno);
      } else {
        st->print("@%d", sd->bci());
      }
      st->cr();
    }
  }

  // Print relocation information
  const char* str = reloc_string_for(begin, end);
  if (str != NULL) {
    if (sd != NULL) st->cr();
2895
    st->move_to(column);
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    st->print(";   {%s}", str);
  }
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  int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin());
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  if (cont_offset != 0) {
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    st->move_to(column);
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    st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset);
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  }

}

2906 2907
#ifndef PRODUCT

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void nmethod::print_value_on(outputStream* st) const {
2909 2910
  st->print("nmethod");
  print_on(st, NULL);
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}

void nmethod::print_calls(outputStream* st) {
  RelocIterator iter(this);
  while (iter.next()) {
    switch (iter.type()) {
    case relocInfo::virtual_call_type:
    case relocInfo::opt_virtual_call_type: {
      VerifyMutexLocker mc(CompiledIC_lock);
      CompiledIC_at(iter.reloc())->print();
      break;
    }
    case relocInfo::static_call_type:
      st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr());
      compiledStaticCall_at(iter.reloc())->print();
      break;
    }
  }
}

void nmethod::print_handler_table() {
  ExceptionHandlerTable(this).print();
}

void nmethod::print_nul_chk_table() {
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  ImplicitExceptionTable(this).print(code_begin());
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}

void nmethod::print_statistics() {
  ttyLocker ttyl;
  if (xtty != NULL)  xtty->head("statistics type='nmethod'");
  nmethod_stats.print_native_nmethod_stats();
  nmethod_stats.print_nmethod_stats();
  DebugInformationRecorder::print_statistics();
  nmethod_stats.print_pc_stats();
  Dependencies::print_statistics();
  if (xtty != NULL)  xtty->tail("statistics");
}

#endif // PRODUCT