jdk8-mips64-public/hotspot: src/cpu/sparc/vm/c1_MacroAssembler

src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp@dd031b2226de (annotated)

src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp

Mon, 10 Jan 2011 18:46:29 -0800

author: iveresov
date: Mon, 10 Jan 2011 18:46:29 -0800
changeset 2438: dd031b2226de
parent 2344: ac637b7220d1
child 2423: b1a2afa37ec4
permissions: -rw-r--r--

4930919: race condition in MDO creation at back branch locations
Summary: Reuse set_method_data_for_bcp() to setup mdp after MDO creation.
Reviewed-by: kvn, never

 /*
  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "c1/c1_MacroAssembler.hpp"
 #include "c1/c1_Runtime1.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "interpreter/interpreter.hpp"
 #include "oops/arrayOop.hpp"
 #include "oops/markOop.hpp"
 #include "runtime/basicLock.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/os.hpp"
 #include "runtime/stubRoutines.hpp"
 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
   Label L;
   const Register temp_reg = G3_scratch;
   // Note: needs more testing of out-of-line vs. inline slow case
   verify_oop(receiver);
   load_klass(receiver, temp_reg);
   cmp(temp_reg, iCache);
   brx(Assembler::equal, true, Assembler::pt, L);
   delayed()->nop();
   AddressLiteral ic_miss(SharedRuntime::get_ic_miss_stub());
   jump_to(ic_miss, temp_reg);
   delayed()->nop();
   align(CodeEntryAlignment);
   bind(L);
 }
 void C1_MacroAssembler::explicit_null_check(Register base) {
   Unimplemented();
 }
 void C1_MacroAssembler::build_frame(int frame_size_in_bytes) {
   generate_stack_overflow_check(frame_size_in_bytes);
   // Create the frame.
   save_frame_c1(frame_size_in_bytes);
 }
 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) {
   if (C1Breakpoint) breakpoint_trap();
   inline_cache_check(receiver, ic_klass);
 }
 void C1_MacroAssembler::verified_entry() {
   if (C1Breakpoint) breakpoint_trap();
   // build frame
   verify_FPU(0, "method_entry");
 }
 void C1_MacroAssembler::lock_object(Register Rmark, Register Roop, Register Rbox, Register Rscratch, Label& slow_case) {
   assert_different_registers(Rmark, Roop, Rbox, Rscratch);
   Label done;
   Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
   // The following move must be the first instruction of emitted since debug
   // information may be generated for it.
   // Load object header
   ld_ptr(mark_addr, Rmark);
   verify_oop(Roop);
   // save object being locked into the BasicObjectLock
   st_ptr(Roop, Rbox, BasicObjectLock::obj_offset_in_bytes());
   if (UseBiasedLocking) {
     biased_locking_enter(Roop, Rmark, Rscratch, done, &slow_case);
   }
   // Save Rbox in Rscratch to be used for the cas operation
   mov(Rbox, Rscratch);
   // and mark it unlocked
   or3(Rmark, markOopDesc::unlocked_value, Rmark);
   // save unlocked object header into the displaced header location on the stack
   st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
   // compare object markOop with Rmark and if equal exchange Rscratch with object markOop
   assert(mark_addr.disp() == 0, "cas must take a zero displacement");
   casx_under_lock(mark_addr.base(), Rmark, Rscratch, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
   // if compare/exchange succeeded we found an unlocked object and we now have locked it
   // hence we are done
   cmp(Rmark, Rscratch);
   brx(Assembler::equal, false, Assembler::pt, done);
   delayed()->sub(Rscratch, SP, Rscratch);  //pull next instruction into delay slot
   // we did not find an unlocked object so see if this is a recursive case
   // sub(Rscratch, SP, Rscratch);
   assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
   andcc(Rscratch, 0xfffff003, Rscratch);
   brx(Assembler::notZero, false, Assembler::pn, slow_case);
   delayed()->st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
   bind(done);
 }
 void C1_MacroAssembler::unlock_object(Register Rmark, Register Roop, Register Rbox, Label& slow_case) {
   assert_different_registers(Rmark, Roop, Rbox);
   Label done;
   Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
   assert(mark_addr.disp() == 0, "cas must take a zero displacement");
   if (UseBiasedLocking) {
     // load the object out of the BasicObjectLock
     ld_ptr(Rbox, BasicObjectLock::obj_offset_in_bytes(), Roop);
     verify_oop(Roop);
     biased_locking_exit(mark_addr, Rmark, done);
   }
   // Test first it it is a fast recursive unlock
   ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rmark);
   br_null(Rmark, false, Assembler::pt, done);
   delayed()->nop();
   if (!UseBiasedLocking) {
     // load object
     ld_ptr(Rbox, BasicObjectLock::obj_offset_in_bytes(), Roop);
     verify_oop(Roop);
   }
   // Check if it is still a light weight lock, this is is true if we see
   // the stack address of the basicLock in the markOop of the object
   casx_under_lock(mark_addr.base(), Rbox, Rmark, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
   cmp(Rbox, Rmark);
   brx(Assembler::notEqual, false, Assembler::pn, slow_case);
   delayed()->nop();
   // Done
   bind(done);
 }
 void C1_MacroAssembler::try_allocate(
   Register obj,                        // result: pointer to object after successful allocation
   Register var_size_in_bytes,          // object size in bytes if unknown at compile time; invalid otherwise
   int      con_size_in_bytes,          // object size in bytes if   known at compile time
   Register t1,                         // temp register
   Register t2,                         // temp register
   Label&   slow_case                   // continuation point if fast allocation fails
 ) {
   if (UseTLAB) {
     tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
   } else {
     eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
   }
 }
 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
   assert_different_registers(obj, klass, len, t1, t2);
   if (UseBiasedLocking && !len->is_valid()) {
     ld_ptr(klass, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes(), t1);
   } else {
     set((intx)markOopDesc::prototype(), t1);
   }
   st_ptr(t1, obj, oopDesc::mark_offset_in_bytes());
   if (UseCompressedOops) {
     // Save klass
     mov(klass, t1);
     encode_heap_oop_not_null(t1);
     stw(t1, obj, oopDesc::klass_offset_in_bytes());
   } else {
     st_ptr(klass, obj, oopDesc::klass_offset_in_bytes());
   }
   if (len->is_valid()) st(len, obj, arrayOopDesc::length_offset_in_bytes());
   else if (UseCompressedOops) {
     store_klass_gap(G0, obj);
   }
 }
 void C1_MacroAssembler::initialize_body(Register base, Register index) {
   assert_different_registers(base, index);
   Label loop;
   bind(loop);
   subcc(index, HeapWordSize, index);
   brx(Assembler::greaterEqual, true, Assembler::pt, loop);
   delayed()->st_ptr(G0, base, index);
 }
 void C1_MacroAssembler::allocate_object(
   Register obj,                        // result: pointer to object after successful allocation
   Register t1,                         // temp register
   Register t2,                         // temp register
   Register t3,                         // temp register
   int      hdr_size,                   // object header size in words
   int      obj_size,                   // object size in words
   Register klass,                      // object klass
   Label&   slow_case                   // continuation point if fast allocation fails
 ) {
   assert_different_registers(obj, t1, t2, t3, klass);
   assert(klass == G5, "must be G5");
   // allocate space & initialize header
   if (!is_simm13(obj_size * wordSize)) {
     // would need to use extra register to load
     // object size => go the slow case for now
     br(Assembler::always, false, Assembler::pt, slow_case);
     delayed()->nop();
     return;
   }
   try_allocate(obj, noreg, obj_size * wordSize, t2, t3, slow_case);
   initialize_object(obj, klass, noreg, obj_size * HeapWordSize, t1, t2);
 }
 void C1_MacroAssembler::initialize_object(
   Register obj,                        // result: pointer to object after successful allocation
   Register klass,                      // object klass
   Register var_size_in_bytes,          // object size in bytes if unknown at compile time; invalid otherwise
   int      con_size_in_bytes,          // object size in bytes if   known at compile time
   Register t1,                         // temp register
   Register t2                          // temp register
   ) {
   const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
   initialize_header(obj, klass, noreg, t1, t2);
 #ifdef ASSERT
   {
     Label ok;
     ld(klass, klassOopDesc::header_size() * HeapWordSize + Klass::layout_helper_offset_in_bytes(), t1);
     if (var_size_in_bytes != noreg) {
       cmp(t1, var_size_in_bytes);
     } else {
       cmp(t1, con_size_in_bytes);
     }
     brx(Assembler::equal, false, Assembler::pt, ok);
     delayed()->nop();
     stop("bad size in initialize_object");
     should_not_reach_here();
     bind(ok);
   }
 #endif
   // initialize body
   const int threshold = 5 * HeapWordSize;              // approximate break even point for code size
   if (var_size_in_bytes != noreg) {
     // use a loop
     add(obj, hdr_size_in_bytes, t1);               // compute address of first element
     sub(var_size_in_bytes, hdr_size_in_bytes, t2); // compute size of body
     initialize_body(t1, t2);
 #ifndef _LP64
   } else if (VM_Version::v9_instructions_work() && con_size_in_bytes < threshold * 2) {
     // on v9 we can do double word stores to fill twice as much space.
     assert(hdr_size_in_bytes % 8 == 0, "double word aligned");
     assert(con_size_in_bytes % 8 == 0, "double word aligned");
     for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += 2 * HeapWordSize) stx(G0, obj, i);
 #endif
   } else if (con_size_in_bytes <= threshold) {
     // use explicit NULL stores
     for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += HeapWordSize)     st_ptr(G0, obj, i);
   } else if (con_size_in_bytes > hdr_size_in_bytes) {
     // use a loop
     const Register base  = t1;
     const Register index = t2;
     add(obj, hdr_size_in_bytes, base);               // compute address of first element
     // compute index = number of words to clear
     set(con_size_in_bytes - hdr_size_in_bytes, index);
     initialize_body(base, index);
   }
   if (CURRENT_ENV->dtrace_alloc_probes()) {
     assert(obj == O0, "must be");
     call(CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)),
          relocInfo::runtime_call_type);
     delayed()->nop();
   }
   verify_oop(obj);
 }
 void C1_MacroAssembler::allocate_array(
   Register obj,                        // result: pointer to array after successful allocation
   Register len,                        // array length
   Register t1,                         // temp register
   Register t2,                         // temp register
   Register t3,                         // temp register
   int      hdr_size,                   // object header size in words
   int      elt_size,                   // element size in bytes
   Register klass,                      // object klass
   Label&   slow_case                   // continuation point if fast allocation fails
 ) {
   assert_different_registers(obj, len, t1, t2, t3, klass);
   assert(klass == G5, "must be G5");
   assert(t1 == G1, "must be G1");
   // determine alignment mask
   assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
   // check for negative or excessive length
   // note: the maximum length allowed is chosen so that arrays of any
   //       element size with this length are always smaller or equal
   //       to the largest integer (i.e., array size computation will
   //       not overflow)
   set(max_array_allocation_length, t1);
   cmp(len, t1);
   br(Assembler::greaterUnsigned, false, Assembler::pn, slow_case);
   // compute array size
   // note: if 0 <= len <= max_length, len*elt_size + header + alignment is
   //       smaller or equal to the largest integer; also, since top is always
   //       aligned, we can do the alignment here instead of at the end address
   //       computation
   const Register arr_size = t1;
   switch (elt_size) {
     case  1: delayed()->mov(len,    arr_size); break;
     case  2: delayed()->sll(len, 1, arr_size); break;
     case  4: delayed()->sll(len, 2, arr_size); break;
     case  8: delayed()->sll(len, 3, arr_size); break;
     default: ShouldNotReachHere();
   }
   add(arr_size, hdr_size * wordSize + MinObjAlignmentInBytesMask, arr_size); // add space for header & alignment
   and3(arr_size, ~MinObjAlignmentInBytesMask, arr_size);                     // align array size
   // allocate space & initialize header
   if (UseTLAB) {
     tlab_allocate(obj, arr_size, 0, t2, slow_case);
   } else {
     eden_allocate(obj, arr_size, 0, t2, t3, slow_case);
   }
   initialize_header(obj, klass, len, t2, t3);
   // initialize body
   const Register base  = t2;
   const Register index = t3;
   add(obj, hdr_size * wordSize, base);               // compute address of first element
   sub(arr_size, hdr_size * wordSize, index);         // compute index = number of words to clear
   initialize_body(base, index);
   if (CURRENT_ENV->dtrace_alloc_probes()) {
     assert(obj == O0, "must be");
     call(CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)),
          relocInfo::runtime_call_type);
     delayed()->nop();
   }
   verify_oop(obj);
 }
 #ifndef PRODUCT
 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
   if (!VerifyOops) return;
   verify_oop_addr(Address(SP, stack_offset + STACK_BIAS));
 }
 void C1_MacroAssembler::verify_not_null_oop(Register r) {
   Label not_null;
   br_zero(Assembler::notEqual, false, Assembler::pt, r, not_null);
   delayed()->nop();
   stop("non-null oop required");
   bind(not_null);
   if (!VerifyOops) return;
   verify_oop(r);
 }
 void C1_MacroAssembler::invalidate_registers(bool iregisters, bool lregisters, bool oregisters,
                                              Register preserve1, Register preserve2) {
   if (iregisters) {
     for (int i = 0; i < 6; i++) {
       Register r = as_iRegister(i);
       if (r != preserve1 && r != preserve2)  set(0xdead, r);
     }
   }
   if (oregisters) {
     for (int i = 0; i < 6; i++) {
       Register r = as_oRegister(i);
       if (r != preserve1 && r != preserve2)  set(0xdead, r);
     }
   }
   if (lregisters) {
     for (int i = 0; i < 8; i++) {
       Register r = as_lRegister(i);
       if (r != preserve1 && r != preserve2)  set(0xdead, r);
     }
   }
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp@dd031b2226de (annotated)

src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp