jdk8-mips64-public/hotspot: src/share/vm/code/relocInfo.cpp@1a5913bf5e19 (annotated)

src/share/vm/code/relocInfo.cpp@1a5913bf5e19 (annotated)

src/share/vm/code/relocInfo.cpp

Thu, 20 May 2010 06:34:23 -0700

author: twisti
date: Thu, 20 May 2010 06:34:23 -0700
changeset 1918: 1a5913bf5e19
parent 435: a61af66fc99e
child 1934: e9ff18c4ace7
permissions: -rw-r--r--

6951083: oops and relocations should part of nmethod not CodeBlob
Summary: This moves the oops from Codeblob to nmethod.
Reviewed-by: kvn, never

 /*
  * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_relocInfo.cpp.incl"
 const RelocationHolder RelocationHolder::none; // its type is relocInfo::none
 // Implementation of relocInfo
 #ifdef ASSERT
 relocInfo::relocInfo(relocType t, int off, int f) {
   assert(t != data_prefix_tag, "cannot build a prefix this way");
   assert((t & type_mask) == t, "wrong type");
   assert((f & format_mask) == f, "wrong format");
   assert(off >= 0 && off < offset_limit(), "offset out off bounds");
   assert((off & (offset_unit-1)) == 0, "misaligned offset");
   (*this) = relocInfo(t, RAW_BITS, off, f);
 }
 #endif
 void relocInfo::initialize(CodeSection* dest, Relocation* reloc) {
   relocInfo* data = this+1;  // here's where the data might go
   dest->set_locs_end(data);  // sync end: the next call may read dest.locs_end
   reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end
   relocInfo* data_limit = dest->locs_end();
   if (data_limit > data) {
     relocInfo suffix = (*this);
     data_limit = this->finish_prefix((short*) data_limit);
     // Finish up with the suffix.  (Hack note: pack_data_to might edit this.)
     *data_limit = suffix;
     dest->set_locs_end(data_limit+1);
   }
 }
 relocInfo* relocInfo::finish_prefix(short* prefix_limit) {
   assert(sizeof(relocInfo) == sizeof(short), "change this code");
   short* p = (short*)(this+1);
   assert(prefix_limit >= p, "must be a valid span of data");
   int plen = prefix_limit - p;
   if (plen == 0) {
     debug_only(_value = 0xFFFF);
     return this;                         // no data: remove self completely
   }
   if (plen == 1 && fits_into_immediate(p[0])) {
     (*this) = immediate_relocInfo(p[0]); // move data inside self
     return this+1;
   }
   // cannot compact, so just update the count and return the limit pointer
   (*this) = prefix_relocInfo(plen);   // write new datalen
   assert(data() + datalen() == prefix_limit, "pointers must line up");
   return (relocInfo*)prefix_limit;
 }
 void relocInfo::set_type(relocType t) {
   int old_offset = addr_offset();
   int old_format = format();
   (*this) = relocInfo(t, old_offset, old_format);
   assert(type()==(int)t, "sanity check");
   assert(addr_offset()==old_offset, "sanity check");
   assert(format()==old_format, "sanity check");
 }
 void relocInfo::set_format(int f) {
   int old_offset = addr_offset();
   assert((f & format_mask) == f, "wrong format");
   _value = (_value & ~(format_mask << offset_width)) | (f << offset_width);
   assert(addr_offset()==old_offset, "sanity check");
 }
 void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) {
   bool found = false;
   while (itr->next() && !found) {
     if (itr->addr() == pc) {
       assert(itr->type()==old_type, "wrong relocInfo type found");
       itr->current()->set_type(new_type);
       found=true;
     }
   }
   assert(found, "no relocInfo found for pc");
 }
 void relocInfo::remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type) {
   change_reloc_info_for_address(itr, pc, old_type, none);
 }
 // ----------------------------------------------------------------------------------------------------
 // Implementation of RelocIterator
 void RelocIterator::initialize(nmethod* nm, address begin, address limit) {
   initialize_misc();
   if (nm == NULL && begin != NULL) {
     // allow nmethod to be deduced from beginning address
     CodeBlob* cb = CodeCache::find_blob(begin);
     nm = cb->as_nmethod_or_null();
   }
   assert(nm != NULL, "must be able to deduce nmethod from other arguments");
   _code    = nm;
   _current = nm->relocation_begin() - 1;
   _end     = nm->relocation_end();
   _addr    = (address) nm->instructions_begin();
   assert(!has_current(), "just checking");
   address code_end = nm->instructions_end();
   assert(begin == NULL || begin >= nm->instructions_begin(), "in bounds");
  // FIX THIS  assert(limit == NULL || limit <= code_end,     "in bounds");
   set_limits(begin, limit);
 }
 RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) {
   initialize_misc();
   _current = cs->locs_start()-1;
   _end     = cs->locs_end();
   _addr    = cs->start();
   _code    = NULL; // Not cb->blob();
   CodeBuffer* cb = cs->outer();
   assert((int)SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal");
   for (int n = 0; n < (int)SECT_LIMIT; n++) {
     _section_start[n] = cb->code_section(n)->start();
   }
   assert(!has_current(), "just checking");
   assert(begin == NULL || begin >= cs->start(), "in bounds");
   assert(limit == NULL || limit <= cs->end(),   "in bounds");
   set_limits(begin, limit);
 }
 enum { indexCardSize = 128 };
 struct RelocIndexEntry {
   jint addr_offset;          // offset from header_end of an addr()
   jint reloc_offset;         // offset from header_end of a relocInfo (prefix)
 };
 static inline int num_cards(int code_size) {
   return (code_size-1) / indexCardSize;
 }
 int RelocIterator::locs_and_index_size(int code_size, int locs_size) {
   if (!UseRelocIndex)  return locs_size;   // no index
   code_size = round_to(code_size, oopSize);
   locs_size = round_to(locs_size, oopSize);
   int index_size = num_cards(code_size) * sizeof(RelocIndexEntry);
   // format of indexed relocs:
   //   relocation_begin:   relocInfo ...
   //   index:              (addr,reloc#) ...
   //                       indexSize           :relocation_end
   return locs_size + index_size + BytesPerInt;
 }
 void RelocIterator::create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end) {
   address relocation_begin = (address)dest_begin;
   address relocation_end   = (address)dest_end;
   int     total_size       = relocation_end - relocation_begin;
   int     locs_size        = dest_count * sizeof(relocInfo);
   if (!UseRelocIndex) {
     Copy::fill_to_bytes(relocation_begin + locs_size, total_size-locs_size, 0);
     return;
   }
   int     index_size       = total_size - locs_size - BytesPerInt;      // find out how much space is left
   int     ncards           = index_size / sizeof(RelocIndexEntry);
   assert(total_size == locs_size + index_size + BytesPerInt, "checkin'");
   assert(index_size >= 0 && index_size % sizeof(RelocIndexEntry) == 0, "checkin'");
   jint*   index_size_addr  = (jint*)relocation_end - 1;
   assert(sizeof(jint) == BytesPerInt, "change this code");
   *index_size_addr = index_size;
   if (index_size != 0) {
     assert(index_size > 0, "checkin'");
     RelocIndexEntry* index = (RelocIndexEntry *)(relocation_begin + locs_size);
     assert(index == (RelocIndexEntry*)index_size_addr - ncards, "checkin'");
     // walk over the relocations, and fill in index entries as we go
     RelocIterator iter;
     const address    initial_addr    = NULL;
     relocInfo* const initial_current = dest_begin - 1;  // biased by -1 like elsewhere
     iter._code    = NULL;
     iter._addr    = initial_addr;
     iter._limit   = (address)(intptr_t)(ncards * indexCardSize);
     iter._current = initial_current;
     iter._end     = dest_begin + dest_count;
     int i = 0;
     address next_card_addr = (address)indexCardSize;
     int addr_offset = 0;
     int reloc_offset = 0;
     while (true) {
       // Checkpoint the iterator before advancing it.
       addr_offset  = iter._addr    - initial_addr;
       reloc_offset = iter._current - initial_current;
       if (!iter.next())  break;
       while (iter.addr() >= next_card_addr) {
         index[i].addr_offset  = addr_offset;
         index[i].reloc_offset = reloc_offset;
         i++;
         next_card_addr += indexCardSize;
       }
     }
     while (i < ncards) {
       index[i].addr_offset  = addr_offset;
       index[i].reloc_offset = reloc_offset;
       i++;
     }
   }
 }
 void RelocIterator::set_limits(address begin, address limit) {
   int index_size = 0;
   if (UseRelocIndex && _code != NULL) {
     index_size = ((jint*)_end)[-1];
     _end = (relocInfo*)( (address)_end - index_size - BytesPerInt );
   }
   _limit = limit;
   // the limit affects this next stuff:
   if (begin != NULL) {
 #ifdef ASSERT
     // In ASSERT mode we do not actually use the index, but simply
     // check that its contents would have led us to the right answer.
     address addrCheck = _addr;
     relocInfo* infoCheck = _current;
 #endif // ASSERT
     if (index_size > 0) {
       // skip ahead
       RelocIndexEntry* index       = (RelocIndexEntry*)_end;
       RelocIndexEntry* index_limit = (RelocIndexEntry*)((address)index + index_size);
       assert(_addr == _code->instructions_begin(), "_addr must be unadjusted");
       int card = (begin - _addr) / indexCardSize;
       if (card > 0) {
         if (index+card-1 < index_limit)  index += card-1;
         else                             index = index_limit - 1;
 #ifdef ASSERT
         addrCheck = _addr    + index->addr_offset;
         infoCheck = _current + index->reloc_offset;
 #else
         // Advance the iterator immediately to the last valid state
         // for the previous card.  Calling "next" will then advance
         // it to the first item on the required card.
         _addr    += index->addr_offset;
         _current += index->reloc_offset;
 #endif // ASSERT
       }
     }
     relocInfo* backup;
     address    backup_addr;
     while (true) {
       backup      = _current;
       backup_addr = _addr;
 #ifdef ASSERT
       if (backup == infoCheck) {
         assert(backup_addr == addrCheck, "must match"); addrCheck = NULL; infoCheck = NULL;
       } else {
         assert(addrCheck == NULL || backup_addr <= addrCheck, "must not pass addrCheck");
       }
 #endif // ASSERT
       if (!next() || addr() >= begin) break;
     }
     assert(addrCheck == NULL || addrCheck == backup_addr, "must have matched addrCheck");
     assert(infoCheck == NULL || infoCheck == backup,      "must have matched infoCheck");
     // At this point, either we are at the first matching record,
     // or else there is no such record, and !has_current().
     // In either case, revert to the immediatly preceding state.
     _current = backup;
     _addr    = backup_addr;
     set_has_current(false);
   }
 }
 void RelocIterator::set_limit(address limit) {
   address code_end = (address)code() + code()->size();
   assert(limit == NULL || limit <= code_end, "in bounds");
   _limit = limit;
 }
 void PatchingRelocIterator:: prepass() {
   // turn breakpoints off during patching
   _init_state = (*this);        // save cursor
   while (next()) {
     if (type() == relocInfo::breakpoint_type) {
       breakpoint_reloc()->set_active(false);
     }
   }
   (RelocIterator&)(*this) = _init_state;        // reset cursor for client
 }
 void PatchingRelocIterator:: postpass() {
   // turn breakpoints back on after patching
   (RelocIterator&)(*this) = _init_state;        // reset cursor again
   while (next()) {
     if (type() == relocInfo::breakpoint_type) {
       breakpoint_Relocation* bpt = breakpoint_reloc();
       bpt->set_active(bpt->enabled());
     }
   }
 }
 // All the strange bit-encodings are in here.
 // The idea is to encode relocation data which are small integers
 // very efficiently (a single extra halfword).  Larger chunks of
 // relocation data need a halfword header to hold their size.
 void RelocIterator::advance_over_prefix() {
   if (_current->is_datalen()) {
     _data    = (short*) _current->data();
     _datalen =          _current->datalen();
     _current += _datalen + 1;   // skip the embedded data & header
   } else {
     _databuf = _current->immediate();
     _data = &_databuf;
     _datalen = 1;
     _current++;                 // skip the header
   }
   // The client will see the following relocInfo, whatever that is.
   // It is the reloc to which the preceding data applies.
 }
 address RelocIterator::compute_section_start(int n) const {
 // This routine not only computes a section start, but also
 // memoizes it for later.
 #define CACHE ((RelocIterator*)this)->_section_start[n]
   CodeBlob* cb = code();
   guarantee(cb != NULL, "must have a code blob");
   if (n == CodeBuffer::SECT_INSTS)
     return CACHE = cb->instructions_begin();
   assert(cb->is_nmethod(), "only nmethods have these sections");
   nmethod* nm = (nmethod*) cb;
   address res = NULL;
   switch (n) {
   case CodeBuffer::SECT_STUBS:
     res = nm->stub_begin();
     break;
   case CodeBuffer::SECT_CONSTS:
     res = nm->consts_begin();
     break;
   default:
     ShouldNotReachHere();
   }
   assert(nm->contains(res) || res == nm->instructions_end(), "tame pointer");
   CACHE = res;
   return res;
 #undef CACHE
 }
 Relocation* RelocIterator::reloc() {
   // (take the "switch" out-of-line)
   relocInfo::relocType t = type();
   if (false) {}
   #define EACH_TYPE(name)                             \
   else if (t == relocInfo::name##_type) {             \
     return name##_reloc();                            \
   }
   APPLY_TO_RELOCATIONS(EACH_TYPE);
   #undef EACH_TYPE
   assert(t == relocInfo::none, "must be padding");
   return new(_rh) Relocation();
 }
 //////// Methods for flyweight Relocation types
 RelocationHolder RelocationHolder::plus(int offset) const {
   if (offset != 0) {
     switch (type()) {
     case relocInfo::none:
       break;
     case relocInfo::oop_type:
       {
         oop_Relocation* r = (oop_Relocation*)reloc();
         return oop_Relocation::spec(r->oop_index(), r->offset() + offset);
       }
     default:
       ShouldNotReachHere();
     }
   }
   return (*this);
 }
 void Relocation::guarantee_size() {
   guarantee(false, "Make _relocbuf bigger!");
 }
     // some relocations can compute their own values
 address Relocation::value() {
   ShouldNotReachHere();
   return NULL;
 }
 void Relocation::set_value(address x) {
   ShouldNotReachHere();
 }
 RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) {
   if (rtype == relocInfo::none)  return RelocationHolder::none;
   relocInfo ri = relocInfo(rtype, 0);
   RelocIterator itr;
   itr.set_current(ri);
   itr.reloc();
   return itr._rh;
 }
 static inline bool is_index(intptr_t index) {
   return 0 < index && index < os::vm_page_size();
 }
 int32_t Relocation::runtime_address_to_index(address runtime_address) {
   assert(!is_index((intptr_t)runtime_address), "must not look like an index");
   if (runtime_address == NULL)  return 0;
   StubCodeDesc* p = StubCodeDesc::desc_for(runtime_address);
   if (p != NULL && p->begin() == runtime_address) {
     assert(is_index(p->index()), "there must not be too many stubs");
     return (int32_t)p->index();
   } else {
     // Known "miscellaneous" non-stub pointers:
     // os::get_polling_page(), SafepointSynchronize::address_of_state()
     if (PrintRelocations) {
       tty->print_cr("random unregistered address in relocInfo: " INTPTR_FORMAT, runtime_address);
     }
 #ifndef _LP64
     return (int32_t) (intptr_t)runtime_address;
 #else
     // didn't fit return non-index
     return -1;
 #endif /* _LP64 */
   }
 }
 address Relocation::index_to_runtime_address(int32_t index) {
   if (index == 0)  return NULL;
   if (is_index(index)) {
     StubCodeDesc* p = StubCodeDesc::desc_for_index(index);
     assert(p != NULL, "there must be a stub for this index");
     return p->begin();
   } else {
 #ifndef _LP64
     // this only works on 32bit machines
     return (address) ((intptr_t) index);
 #else
     fatal("Relocation::index_to_runtime_address, int32_t not pointer sized");
     return NULL;
 #endif /* _LP64 */
   }
 }
 address Relocation::old_addr_for(address newa,
                                  const CodeBuffer* src, CodeBuffer* dest) {
   int sect = dest->section_index_of(newa);
   guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
   address ostart = src->code_section(sect)->start();
   address nstart = dest->code_section(sect)->start();
   return ostart + (newa - nstart);
 }
 address Relocation::new_addr_for(address olda,
                                  const CodeBuffer* src, CodeBuffer* dest) {
   debug_only(const CodeBuffer* src0 = src);
   int sect = CodeBuffer::SECT_NONE;
   // Look for olda in the source buffer, and all previous incarnations
   // if the source buffer has been expanded.
   for (; src != NULL; src = src->before_expand()) {
     sect = src->section_index_of(olda);
     if (sect != CodeBuffer::SECT_NONE)  break;
   }
   guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address");
   address ostart = src->code_section(sect)->start();
   address nstart = dest->code_section(sect)->start();
   return nstart + (olda - ostart);
 }
 void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) {
   address addr0 = addr;
   if (addr0 == NULL || dest->allocates2(addr0))  return;
   CodeBuffer* cb = dest->outer();
   addr = new_addr_for(addr0, cb, cb);
   assert(allow_other_sections || dest->contains2(addr),
          "addr must be in required section");
 }
 void CallRelocation::set_destination(address x) {
   pd_set_call_destination(x);
 }
 void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
   // Usually a self-relative reference to an external routine.
   // On some platforms, the reference is absolute (not self-relative).
   // The enhanced use of pd_call_destination sorts this all out.
   address orig_addr = old_addr_for(addr(), src, dest);
   address callee    = pd_call_destination(orig_addr);
   // Reassert the callee address, this time in the new copy of the code.
   pd_set_call_destination(callee);
 }
 //// pack/unpack methods
 void oop_Relocation::pack_data_to(CodeSection* dest) {
   short* p = (short*) dest->locs_end();
   p = pack_2_ints_to(p, _oop_index, _offset);
   dest->set_locs_end((relocInfo*) p);
 }
 void oop_Relocation::unpack_data() {
   unpack_2_ints(_oop_index, _offset);
 }
 void virtual_call_Relocation::pack_data_to(CodeSection* dest) {
   short*  p     = (short*) dest->locs_end();
   address point =          dest->locs_point();
   // Try to make a pointer NULL first.
   if (_oop_limit >= point &&
       _oop_limit <= point + NativeCall::instruction_size) {
     _oop_limit = NULL;
   }
   // If the _oop_limit is NULL, it "defaults" to the end of the call.
   // See ic_call_Relocation::oop_limit() below.
   normalize_address(_first_oop, dest);
   normalize_address(_oop_limit, dest);
   jint x0 = scaled_offset_null_special(_first_oop, point);
   jint x1 = scaled_offset_null_special(_oop_limit, point);
   p = pack_2_ints_to(p, x0, x1);
   dest->set_locs_end((relocInfo*) p);
 }
 void virtual_call_Relocation::unpack_data() {
   jint x0, x1; unpack_2_ints(x0, x1);
   address point = addr();
   _first_oop = x0==0? NULL: address_from_scaled_offset(x0, point);
   _oop_limit = x1==0? NULL: address_from_scaled_offset(x1, point);
 }
 void static_stub_Relocation::pack_data_to(CodeSection* dest) {
   short* p = (short*) dest->locs_end();
   CodeSection* insts = dest->outer()->insts();
   normalize_address(_static_call, insts);
   p = pack_1_int_to(p, scaled_offset(_static_call, insts->start()));
   dest->set_locs_end((relocInfo*) p);
 }
 void static_stub_Relocation::unpack_data() {
   address base = binding()->section_start(CodeBuffer::SECT_INSTS);
   _static_call = address_from_scaled_offset(unpack_1_int(), base);
 }
 void external_word_Relocation::pack_data_to(CodeSection* dest) {
   short* p = (short*) dest->locs_end();
   int32_t index = runtime_address_to_index(_target);
 #ifndef _LP64
   p = pack_1_int_to(p, index);
 #else
   if (is_index(index)) {
     p = pack_2_ints_to(p, index, 0);
   } else {
     jlong t = (jlong) _target;
     int32_t lo = low(t);
     int32_t hi = high(t);
     p = pack_2_ints_to(p, lo, hi);
     DEBUG_ONLY(jlong t1 = jlong_from(hi, lo));
     assert(!is_index(t1) && (address) t1 == _target, "not symmetric");
   }
 #endif /* _LP64 */
   dest->set_locs_end((relocInfo*) p);
 }
 void external_word_Relocation::unpack_data() {
 #ifndef _LP64
   _target = index_to_runtime_address(unpack_1_int());
 #else
   int32_t lo, hi;
   unpack_2_ints(lo, hi);
   jlong t = jlong_from(hi, lo);;
   if (is_index(t)) {
     _target = index_to_runtime_address(t);
   } else {
     _target = (address) t;
   }
 #endif /* _LP64 */
 }
 void internal_word_Relocation::pack_data_to(CodeSection* dest) {
   short* p = (short*) dest->locs_end();
   normalize_address(_target, dest, true);
   // Check whether my target address is valid within this section.
   // If not, strengthen the relocation type to point to another section.
   int sindex = _section;
   if (sindex == CodeBuffer::SECT_NONE && _target != NULL
       && (!dest->allocates(_target) || _target == dest->locs_point())) {
     sindex = dest->outer()->section_index_of(_target);
     guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere");
     relocInfo* base = dest->locs_end() - 1;
     assert(base->type() == this->type(), "sanity");
     // Change the written type, to be section_word_type instead.
     base->set_type(relocInfo::section_word_type);
   }
   // Note: An internal_word relocation cannot refer to its own instruction,
   // because we reserve "0" to mean that the pointer itself is embedded
   // in the code stream.  We use a section_word relocation for such cases.
   if (sindex == CodeBuffer::SECT_NONE) {
     assert(type() == relocInfo::internal_word_type, "must be base class");
     guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section");
     jint x0 = scaled_offset_null_special(_target, dest->locs_point());
     assert(!(x0 == 0 && _target != NULL), "correct encoding of null target");
     p = pack_1_int_to(p, x0);
   } else {
     assert(_target != NULL, "sanity");
     CodeSection* sect = dest->outer()->code_section(sindex);
     guarantee(sect->allocates2(_target), "must be in correct section");
     address base = sect->start();
     jint offset = scaled_offset(_target, base);
     assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity");
     assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++");
     p = pack_1_int_to(p, (offset << section_width) | sindex);
   }
   dest->set_locs_end((relocInfo*) p);
 }
 void internal_word_Relocation::unpack_data() {
   jint x0 = unpack_1_int();
   _target = x0==0? NULL: address_from_scaled_offset(x0, addr());
   _section = CodeBuffer::SECT_NONE;
 }
 void section_word_Relocation::unpack_data() {
   jint    x      = unpack_1_int();
   jint    offset = (x >> section_width);
   int     sindex = (x & ((1<<section_width)-1));
   address base   = binding()->section_start(sindex);
   _section = sindex;
   _target  = address_from_scaled_offset(offset, base);
 }
 void breakpoint_Relocation::pack_data_to(CodeSection* dest) {
   short* p = (short*) dest->locs_end();
   address point = dest->locs_point();
   *p++ = _bits;
   assert(_target != NULL, "sanity");
   if (internal())  normalize_address(_target, dest);
   jint target_bits =
     (jint)( internal() ? scaled_offset           (_target, point)
                        : runtime_address_to_index(_target) );
   if (settable()) {
     // save space for set_target later
     p = add_jint(p, target_bits);
   } else {
     p = add_var_int(p, target_bits);
   }
   for (int i = 0; i < instrlen(); i++) {
     // put placeholder words until bytes can be saved
     p = add_short(p, (short)0x7777);
   }
   dest->set_locs_end((relocInfo*) p);
 }
 void breakpoint_Relocation::unpack_data() {
   _bits = live_bits();
   int targetlen = datalen() - 1 - instrlen();
   jint target_bits = 0;
   if (targetlen == 0)       target_bits = 0;
   else if (targetlen == 1)  target_bits = *(data()+1);
   else if (targetlen == 2)  target_bits = relocInfo::jint_from_data(data()+1);
   else                      { ShouldNotReachHere(); }
   _target = internal() ? address_from_scaled_offset(target_bits, addr())
                        : index_to_runtime_address  (target_bits);
 }
 //// miscellaneous methods
 oop* oop_Relocation::oop_addr() {
   int n = _oop_index;
   if (n == 0) {
     // oop is stored in the code stream
     return (oop*) pd_address_in_code();
   } else {
     // oop is stored in table at nmethod::oops_begin
     return code()->oop_addr_at(n);
   }
 }
 oop oop_Relocation::oop_value() {
   oop v = *oop_addr();
   // clean inline caches store a special pseudo-null
   if (v == (oop)Universe::non_oop_word())  v = NULL;
   return v;
 }
 void oop_Relocation::fix_oop_relocation() {
   if (!oop_is_immediate()) {
     // get the oop from the pool, and re-insert it into the instruction:
     set_value(value());
   }
 }
 RelocIterator virtual_call_Relocation::parse_ic(nmethod* &nm, address &ic_call, address &first_oop,
                                                 oop* &oop_addr, bool *is_optimized) {
   assert(ic_call != NULL, "ic_call address must be set");
   assert(ic_call != NULL || first_oop != NULL, "must supply a non-null input");
   if (nm == NULL) {
     CodeBlob* code;
     if (ic_call != NULL) {
       code = CodeCache::find_blob(ic_call);
     } else if (first_oop != NULL) {
       code = CodeCache::find_blob(first_oop);
     }
     nm = code->as_nmethod_or_null();
     assert(nm != NULL, "address to parse must be in nmethod");
   }
   assert(ic_call   == NULL || nm->contains(ic_call),   "must be in nmethod");
   assert(first_oop == NULL || nm->contains(first_oop), "must be in nmethod");
   address oop_limit = NULL;
   if (ic_call != NULL) {
     // search for the ic_call at the given address
     RelocIterator iter(nm, ic_call, ic_call+1);
     bool ret = iter.next();
     assert(ret == true, "relocInfo must exist at this address");
     assert(iter.addr() == ic_call, "must find ic_call");
     if (iter.type() == relocInfo::virtual_call_type) {
       virtual_call_Relocation* r = iter.virtual_call_reloc();
       first_oop = r->first_oop();
       oop_limit = r->oop_limit();
       *is_optimized = false;
     } else {
       assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
       *is_optimized = true;
       oop_addr = NULL;
       first_oop = NULL;
       return iter;
     }
   }
   // search for the first_oop, to get its oop_addr
   RelocIterator all_oops(nm, first_oop);
   RelocIterator iter = all_oops;
   iter.set_limit(first_oop+1);
   bool found_oop = false;
   while (iter.next()) {
     if (iter.type() == relocInfo::oop_type) {
       assert(iter.addr() == first_oop, "must find first_oop");
       oop_addr = iter.oop_reloc()->oop_addr();
       found_oop = true;
       break;
     }
   }
   assert(found_oop, "must find first_oop");
   bool did_reset = false;
   while (ic_call == NULL) {
     // search forward for the ic_call matching the given first_oop
     while (iter.next()) {
       if (iter.type() == relocInfo::virtual_call_type) {
         virtual_call_Relocation* r = iter.virtual_call_reloc();
         if (r->first_oop() == first_oop) {
           ic_call   = r->addr();
           oop_limit = r->oop_limit();
           break;
         }
       }
     }
     guarantee(!did_reset, "cannot find ic_call");
     iter = RelocIterator(nm); // search the whole nmethod
     did_reset = true;
   }
   assert(oop_limit != NULL && first_oop != NULL && ic_call != NULL, "");
   all_oops.set_limit(oop_limit);
   return all_oops;
 }
 address virtual_call_Relocation::first_oop() {
   assert(_first_oop != NULL && _first_oop < addr(), "must precede ic_call");
   return _first_oop;
 }
 address virtual_call_Relocation::oop_limit() {
   if (_oop_limit == NULL)
     return addr() + NativeCall::instruction_size;
   else
     return _oop_limit;
 }
 void virtual_call_Relocation::clear_inline_cache() {
   // No stubs for ICs
   // Clean IC
   ResourceMark rm;
   CompiledIC* icache = CompiledIC_at(this);
   icache->set_to_clean();
 }
 void opt_virtual_call_Relocation::clear_inline_cache() {
   // No stubs for ICs
   // Clean IC
   ResourceMark rm;
   CompiledIC* icache = CompiledIC_at(this);
   icache->set_to_clean();
 }
 address opt_virtual_call_Relocation::static_stub() {
   // search for the static stub who points back to this static call
   address static_call_addr = addr();
   RelocIterator iter(code());
   while (iter.next()) {
     if (iter.type() == relocInfo::static_stub_type) {
       if (iter.static_stub_reloc()->static_call() == static_call_addr) {
         return iter.addr();
       }
     }
   }
   return NULL;
 }
 void static_call_Relocation::clear_inline_cache() {
   // Safe call site info
   CompiledStaticCall* handler = compiledStaticCall_at(this);
   handler->set_to_clean();
 }
 address static_call_Relocation::static_stub() {
   // search for the static stub who points back to this static call
   address static_call_addr = addr();
   RelocIterator iter(code());
   while (iter.next()) {
     if (iter.type() == relocInfo::static_stub_type) {
       if (iter.static_stub_reloc()->static_call() == static_call_addr) {
         return iter.addr();
       }
     }
   }
   return NULL;
 }
 void static_stub_Relocation::clear_inline_cache() {
   // Call stub is only used when calling the interpreted code.
   // It does not really need to be cleared, except that we want to clean out the methodoop.
   CompiledStaticCall::set_stub_to_clean(this);
 }
 void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
   address target = _target;
   if (target == NULL) {
     // An absolute embedded reference to an external location,
     // which means there is nothing to fix here.
     return;
   }
   // Probably this reference is absolute, not relative, so the
   // following is probably a no-op.
   assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity");
   set_value(target);
 }
 address external_word_Relocation::target() {
   address target = _target;
   if (target == NULL) {
     target = pd_get_address_from_code();
   }
   return target;
 }
 void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
   address target = _target;
   if (target == NULL) {
     if (addr_in_const()) {
       target = new_addr_for(*(address*)addr(), src, dest);
     } else {
       target = new_addr_for(pd_get_address_from_code(), src, dest);
     }
   }
   set_value(target);
 }
 address internal_word_Relocation::target() {
   address target = _target;
   if (target == NULL) {
     target = pd_get_address_from_code();
   }
   return target;
 }
 breakpoint_Relocation::breakpoint_Relocation(int kind, address target, bool internal) {
   bool active    = false;
   bool enabled   = (kind == initialization);
   bool removable = (kind != safepoint);
   bool settable  = (target == NULL);
   int bits = kind;
   if (enabled)    bits |= enabled_state;
   if (internal)   bits |= internal_attr;
   if (removable)  bits |= removable_attr;
   if (settable)   bits |= settable_attr;
   _bits = bits | high_bit;
   _target = target;
   assert(this->kind()      == kind,      "kind encoded");
   assert(this->enabled()   == enabled,   "enabled encoded");
   assert(this->active()    == active,    "active encoded");
   assert(this->internal()  == internal,  "internal encoded");
   assert(this->removable() == removable, "removable encoded");
   assert(this->settable()  == settable,  "settable encoded");
 }
 address breakpoint_Relocation::target() const {
   return _target;
 }
 void breakpoint_Relocation::set_target(address x) {
   assert(settable(), "must be settable");
   jint target_bits =
     (jint)(internal() ? scaled_offset           (x, addr())
                       : runtime_address_to_index(x));
   short* p = &live_bits() + 1;
   p = add_jint(p, target_bits);
   assert(p == instrs(), "new target must fit");
   _target = x;
 }
 void breakpoint_Relocation::set_enabled(bool b) {
   if (enabled() == b) return;
   if (b) {
     set_bits(bits() | enabled_state);
   } else {
     set_active(false);          // remove the actual breakpoint insn, if any
     set_bits(bits() & ~enabled_state);
   }
 }
 void breakpoint_Relocation::set_active(bool b) {
   assert(!b || enabled(), "cannot activate a disabled breakpoint");
   if (active() == b) return;
   // %%% should probably seize a lock here (might not be the right lock)
   //MutexLockerEx ml_patch(Patching_lock, true);
   //if (active() == b)  return;         // recheck state after locking
   if (b) {
     set_bits(bits() | active_state);
     if (instrlen() == 0)
       fatal("breakpoints in original code must be undoable");
     pd_swap_in_breakpoint (addr(), instrs(), instrlen());
   } else {
     set_bits(bits() & ~active_state);
     pd_swap_out_breakpoint(addr(), instrs(), instrlen());
   }
 }
 //---------------------------------------------------------------------------------
 // Non-product code
 #ifndef PRODUCT
 static const char* reloc_type_string(relocInfo::relocType t) {
   switch (t) {
   #define EACH_CASE(name) \
   case relocInfo::name##_type: \
     return #name;
   APPLY_TO_RELOCATIONS(EACH_CASE);
   #undef EACH_CASE
   case relocInfo::none:
     return "none";
   case relocInfo::data_prefix_tag:
     return "prefix";
   default:
     return "UNKNOWN RELOC TYPE";
   }
 }
 void RelocIterator::print_current() {
   if (!has_current()) {
     tty->print_cr("(no relocs)");
     return;
   }
   tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT,
              _current, type(), reloc_type_string((relocInfo::relocType) type()), _addr);
   if (current()->format() != 0)
     tty->print(" format=%d", current()->format());
   if (datalen() == 1) {
     tty->print(" data=%d", data()[0]);
   } else if (datalen() > 0) {
     tty->print(" data={");
     for (int i = 0; i < datalen(); i++) {
       tty->print("%04x", data()[i] & 0xFFFF);
     }
     tty->print("}");
   }
   tty->print("]");
   switch (type()) {
   case relocInfo::oop_type:
     {
       oop_Relocation* r = oop_reloc();
       oop* oop_addr  = NULL;
       oop  raw_oop   = NULL;
       oop  oop_value = NULL;
       if (code() != NULL || r->oop_is_immediate()) {
         oop_addr  = r->oop_addr();
         raw_oop   = *oop_addr;
         oop_value = r->oop_value();
       }
       tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]",
                  oop_addr, (address)raw_oop, r->offset());
       // Do not print the oop by default--we want this routine to
       // work even during GC or other inconvenient times.
       if (WizardMode && oop_value != NULL) {
         tty->print("oop_value=" INTPTR_FORMAT ": ", (address)oop_value);
         oop_value->print_value_on(tty);
       }
       break;
     }
   case relocInfo::external_word_type:
   case relocInfo::internal_word_type:
   case relocInfo::section_word_type:
     {
       DataRelocation* r = (DataRelocation*) reloc();
       tty->print(" | [target=" INTPTR_FORMAT "]", r->value()); //value==target
       break;
     }
   case relocInfo::static_call_type:
   case relocInfo::runtime_call_type:
     {
       CallRelocation* r = (CallRelocation*) reloc();
       tty->print(" | [destination=" INTPTR_FORMAT "]", r->destination());
       break;
     }
   case relocInfo::virtual_call_type:
     {
       virtual_call_Relocation* r = (virtual_call_Relocation*) reloc();
       tty->print(" | [destination=" INTPTR_FORMAT " first_oop=" INTPTR_FORMAT " oop_limit=" INTPTR_FORMAT "]",
                  r->destination(), r->first_oop(), r->oop_limit());
       break;
     }
   case relocInfo::static_stub_type:
     {
       static_stub_Relocation* r = (static_stub_Relocation*) reloc();
       tty->print(" | [static_call=" INTPTR_FORMAT "]", r->static_call());
       break;
     }
   }
   tty->cr();
 }
 void RelocIterator::print() {
   RelocIterator save_this = (*this);
   relocInfo* scan = _current;
   if (!has_current())  scan += 1;  // nothing to scan here!
   bool skip_next = has_current();
   bool got_next;
   while (true) {
     got_next = (skip_next || next());
     skip_next = false;
     tty->print("         @" INTPTR_FORMAT ": ", scan);
     relocInfo* newscan = _current+1;
     if (!has_current())  newscan -= 1;  // nothing to scan here!
     while (scan < newscan) {
       tty->print("%04x", *(short*)scan & 0xFFFF);
       scan++;
     }
     tty->cr();
     if (!got_next)  break;
     print_current();
   }
   (*this) = save_this;
 }
 // For the debugger:
 extern "C"
 void print_blob_locs(nmethod* nm) {
   nm->print();
   RelocIterator iter(nm);
   iter.print();
 }
 extern "C"
 void print_buf_locs(CodeBuffer* cb) {
   FlagSetting fs(PrintRelocations, true);
   cb->print();
 }
 #endif // !PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/code/relocInfo.cpp@1a5913bf5e19 (annotated)

src/share/vm/code/relocInfo.cpp