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 /*

  * Copyright (c) 1999, 2011, 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

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  */

 #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_and_brx_short(temp_reg, iCache, Assembler::equal, Assembler::pt, L);

   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_short(Rmark, Assembler::pt, done);

   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, must be global register for incr_allocated_bytes

   Register t2,                         // temp register

   Label&   slow_case                   // continuation point if fast allocation fails

 ) {

   RegisterOrConstant size_in_bytes = var_size_in_bytes->is_valid()

     ? RegisterOrConstant(var_size_in_bytes) : RegisterOrConstant(con_size_in_bytes);

   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);

     incr_allocated_bytes(size_in_bytes, t1, t2);

   }

 }

 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, in_bytes(Klass::prototype_header_offset()), 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, must be a global register for try_allocate

   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

     ba(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, in_bytes(Klass::layout_helper_offset()), t1);

     if (var_size_in_bytes != noreg) {

       cmp_and_brx_short(t1, var_size_in_bytes, Assembler::equal, Assembler::pt, ok);

     } else {

       cmp_and_brx_short(t1, con_size_in_bytes, Assembler::equal, Assembler::pt, ok);

     }

     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_notnull_short(r, Assembler::pt, not_null);

   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