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

src/cpu/sparc/vm/macroAssembler_sparc.cpp@12f651e29f6b (annotated)

src/cpu/sparc/vm/macroAssembler_sparc.cpp

Wed, 15 May 2013 11:05:09 +0200

author: tschatzl
date: Wed, 15 May 2013 11:05:09 +0200
changeset 5119: 12f651e29f6b
parent 4767: a5de0cc2f91c
child 5281: 8d52e305a777
permissions: -rw-r--r--

6843347: Boundary values in some public GC options cause crashes
Summary: Setting some public integer options to specific values causes crashes or undefined GC behavior. This patchset adds the necessary argument checking for these options.
Reviewed-by: jmasa, brutisso

 /*
  * Copyright (c) 1997, 2012, 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 "asm/assembler.inline.hpp"
 #include "compiler/disassembler.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/resourceArea.hpp"
 #include "prims/methodHandles.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/objectMonitor.hpp"
 #include "runtime/os.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc_implementation/g1/heapRegion.hpp"
 #endif // INCLUDE_ALL_GCS
 #ifdef PRODUCT
 #define BLOCK_COMMENT(str) /* nothing */
 #define STOP(error) stop(error)
 #else
 #define BLOCK_COMMENT(str) block_comment(str)
 #define STOP(error) block_comment(error); stop(error)
 #endif
 // Convert the raw encoding form into the form expected by the
 // constructor for Address.
 Address Address::make_raw(int base, int index, int scale, int disp, relocInfo::relocType disp_reloc) {
   assert(scale == 0, "not supported");
   RelocationHolder rspec;
   if (disp_reloc != relocInfo::none) {
     rspec = Relocation::spec_simple(disp_reloc);
   }
   Register rindex = as_Register(index);
   if (rindex != G0) {
     Address madr(as_Register(base), rindex);
     madr._rspec = rspec;
     return madr;
   } else {
     Address madr(as_Register(base), disp);
     madr._rspec = rspec;
     return madr;
   }
 }
 Address Argument::address_in_frame() const {
   // Warning: In LP64 mode disp will occupy more than 10 bits, but
   //          op codes such as ld or ldx, only access disp() to get
   //          their simm13 argument.
   int disp = ((_number - Argument::n_register_parameters + frame::memory_parameter_word_sp_offset) * BytesPerWord) + STACK_BIAS;
   if (is_in())
     return Address(FP, disp); // In argument.
   else
     return Address(SP, disp); // Out argument.
 }
 static const char* argumentNames[][2] = {
   {"A0","P0"}, {"A1","P1"}, {"A2","P2"}, {"A3","P3"}, {"A4","P4"},
   {"A5","P5"}, {"A6","P6"}, {"A7","P7"}, {"A8","P8"}, {"A9","P9"},
   {"A(n>9)","P(n>9)"}
 };
 const char* Argument::name() const {
   int nofArgs = sizeof argumentNames / sizeof argumentNames[0];
   int num = number();
   if (num >= nofArgs)  num = nofArgs - 1;
   return argumentNames[num][is_in() ? 1 : 0];
 }
 #ifdef ASSERT
 // On RISC, there's no benefit to verifying instruction boundaries.
 bool AbstractAssembler::pd_check_instruction_mark() { return false; }
 #endif
 // Patch instruction inst at offset inst_pos to refer to dest_pos
 // and return the resulting instruction.
 // We should have pcs, not offsets, but since all is relative, it will work out
 // OK.
 int MacroAssembler::patched_branch(int dest_pos, int inst, int inst_pos) {
   int m; // mask for displacement field
   int v; // new value for displacement field
   const int word_aligned_ones = -4;
   switch (inv_op(inst)) {
   default: ShouldNotReachHere();
   case call_op:    m = wdisp(word_aligned_ones, 0, 30);  v = wdisp(dest_pos, inst_pos, 30); break;
   case branch_op:
     switch (inv_op2(inst)) {
       case fbp_op2:    m = wdisp(  word_aligned_ones, 0, 19);  v = wdisp(  dest_pos, inst_pos, 19); break;
       case bp_op2:     m = wdisp(  word_aligned_ones, 0, 19);  v = wdisp(  dest_pos, inst_pos, 19); break;
       case fb_op2:     m = wdisp(  word_aligned_ones, 0, 22);  v = wdisp(  dest_pos, inst_pos, 22); break;
       case br_op2:     m = wdisp(  word_aligned_ones, 0, 22);  v = wdisp(  dest_pos, inst_pos, 22); break;
       case cb_op2:     m = wdisp(  word_aligned_ones, 0, 22);  v = wdisp(  dest_pos, inst_pos, 22); break;
       case bpr_op2: {
         if (is_cbcond(inst)) {
           m = wdisp10(word_aligned_ones, 0);
           v = wdisp10(dest_pos, inst_pos);
         } else {
           m = wdisp16(word_aligned_ones, 0);
           v = wdisp16(dest_pos, inst_pos);
         }
         break;
       }
       default: ShouldNotReachHere();
     }
   }
   return  inst & ~m  |  v;
 }
 // Return the offset of the branch destionation of instruction inst
 // at offset pos.
 // Should have pcs, but since all is relative, it works out.
 int MacroAssembler::branch_destination(int inst, int pos) {
   int r;
   switch (inv_op(inst)) {
   default: ShouldNotReachHere();
   case call_op:        r = inv_wdisp(inst, pos, 30);  break;
   case branch_op:
     switch (inv_op2(inst)) {
       case fbp_op2:    r = inv_wdisp(  inst, pos, 19);  break;
       case bp_op2:     r = inv_wdisp(  inst, pos, 19);  break;
       case fb_op2:     r = inv_wdisp(  inst, pos, 22);  break;
       case br_op2:     r = inv_wdisp(  inst, pos, 22);  break;
       case cb_op2:     r = inv_wdisp(  inst, pos, 22);  break;
       case bpr_op2: {
         if (is_cbcond(inst)) {
           r = inv_wdisp10(inst, pos);
         } else {
           r = inv_wdisp16(inst, pos);
         }
         break;
       }
       default: ShouldNotReachHere();
     }
   }
   return r;
 }
 void MacroAssembler::null_check(Register reg, int offset) {
   if (needs_explicit_null_check((intptr_t)offset)) {
     // provoke OS NULL exception if reg = NULL by
     // accessing M[reg] w/o changing any registers
     ld_ptr(reg, 0, G0);
   }
   else {
     // nothing to do, (later) access of M[reg + offset]
     // will provoke OS NULL exception if reg = NULL
   }
 }
 // Ring buffer jumps
 #ifndef PRODUCT
 void MacroAssembler::ret(  bool trace )   { if (trace) {
                                                     mov(I7, O7); // traceable register
                                                     JMP(O7, 2 * BytesPerInstWord);
                                                   } else {
                                                     jmpl( I7, 2 * BytesPerInstWord, G0 );
                                                   }
                                                 }
 void MacroAssembler::retl( bool trace )  { if (trace) JMP(O7, 2 * BytesPerInstWord);
                                                  else jmpl( O7, 2 * BytesPerInstWord, G0 ); }
 #endif /* PRODUCT */
 void MacroAssembler::jmp2(Register r1, Register r2, const char* file, int line ) {
   assert_not_delayed();
   // This can only be traceable if r1 & r2 are visible after a window save
   if (TraceJumps) {
 #ifndef PRODUCT
     save_frame(0);
     verify_thread();
     ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
     add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
     sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
     add(O2, O1, O1);
     add(r1->after_save(), r2->after_save(), O2);
     set((intptr_t)file, O3);
     set(line, O4);
     Label L;
     // get nearby pc, store jmp target
     call(L, relocInfo::none);  // No relocation for call to pc+0x8
     delayed()->st(O2, O1, 0);
     bind(L);
     // store nearby pc
     st(O7, O1, sizeof(intptr_t));
     // store file
     st(O3, O1, 2*sizeof(intptr_t));
     // store line
     st(O4, O1, 3*sizeof(intptr_t));
     add(O0, 1, O0);
     and3(O0, JavaThread::jump_ring_buffer_size  - 1, O0);
     st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
     restore();
 #endif /* PRODUCT */
   }
   jmpl(r1, r2, G0);
 }
 void MacroAssembler::jmp(Register r1, int offset, const char* file, int line ) {
   assert_not_delayed();
   // This can only be traceable if r1 is visible after a window save
   if (TraceJumps) {
 #ifndef PRODUCT
     save_frame(0);
     verify_thread();
     ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
     add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
     sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
     add(O2, O1, O1);
     add(r1->after_save(), offset, O2);
     set((intptr_t)file, O3);
     set(line, O4);
     Label L;
     // get nearby pc, store jmp target
     call(L, relocInfo::none);  // No relocation for call to pc+0x8
     delayed()->st(O2, O1, 0);
     bind(L);
     // store nearby pc
     st(O7, O1, sizeof(intptr_t));
     // store file
     st(O3, O1, 2*sizeof(intptr_t));
     // store line
     st(O4, O1, 3*sizeof(intptr_t));
     add(O0, 1, O0);
     and3(O0, JavaThread::jump_ring_buffer_size  - 1, O0);
     st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
     restore();
 #endif /* PRODUCT */
   }
   jmp(r1, offset);
 }
 // This code sequence is relocatable to any address, even on LP64.
 void MacroAssembler::jumpl(const AddressLiteral& addrlit, Register temp, Register d, int offset, const char* file, int line) {
   assert_not_delayed();
   // Force fixed length sethi because NativeJump and NativeFarCall don't handle
   // variable length instruction streams.
   patchable_sethi(addrlit, temp);
   Address a(temp, addrlit.low10() + offset);  // Add the offset to the displacement.
   if (TraceJumps) {
 #ifndef PRODUCT
     // Must do the add here so relocation can find the remainder of the
     // value to be relocated.
     add(a.base(), a.disp(), a.base(), addrlit.rspec(offset));
     save_frame(0);
     verify_thread();
     ld(G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()), O0);
     add(G2_thread, in_bytes(JavaThread::jmp_ring_offset()), O1);
     sll(O0, exact_log2(4*sizeof(intptr_t)), O2);
     add(O2, O1, O1);
     set((intptr_t)file, O3);
     set(line, O4);
     Label L;
     // get nearby pc, store jmp target
     call(L, relocInfo::none);  // No relocation for call to pc+0x8
     delayed()->st(a.base()->after_save(), O1, 0);
     bind(L);
     // store nearby pc
     st(O7, O1, sizeof(intptr_t));
     // store file
     st(O3, O1, 2*sizeof(intptr_t));
     // store line
     st(O4, O1, 3*sizeof(intptr_t));
     add(O0, 1, O0);
     and3(O0, JavaThread::jump_ring_buffer_size  - 1, O0);
     st(O0, G2_thread, in_bytes(JavaThread::jmp_ring_index_offset()));
     restore();
     jmpl(a.base(), G0, d);
 #else
     jmpl(a.base(), a.disp(), d);
 #endif /* PRODUCT */
   } else {
     jmpl(a.base(), a.disp(), d);
   }
 }
 void MacroAssembler::jump(const AddressLiteral& addrlit, Register temp, int offset, const char* file, int line) {
   jumpl(addrlit, temp, G0, offset, file, line);
 }
 // Conditional breakpoint (for assertion checks in assembly code)
 void MacroAssembler::breakpoint_trap(Condition c, CC cc) {
   trap(c, cc, G0, ST_RESERVED_FOR_USER_0);
 }
 // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
 void MacroAssembler::breakpoint_trap() {
   trap(ST_RESERVED_FOR_USER_0);
 }
 // flush windows (except current) using flushw instruction if avail.
 void MacroAssembler::flush_windows() {
   if (VM_Version::v9_instructions_work())  flushw();
   else                                     flush_windows_trap();
 }
 // Write serialization page so VM thread can do a pseudo remote membar
 // We use the current thread pointer to calculate a thread specific
 // offset to write to within the page. This minimizes bus traffic
 // due to cache line collision.
 void MacroAssembler::serialize_memory(Register thread, Register tmp1, Register tmp2) {
   srl(thread, os::get_serialize_page_shift_count(), tmp2);
   if (Assembler::is_simm13(os::vm_page_size())) {
     and3(tmp2, (os::vm_page_size() - sizeof(int)), tmp2);
   }
   else {
     set((os::vm_page_size() - sizeof(int)), tmp1);
     and3(tmp2, tmp1, tmp2);
   }
   set(os::get_memory_serialize_page(), tmp1);
   st(G0, tmp1, tmp2);
 }
 void MacroAssembler::enter() {
   Unimplemented();
 }
 void MacroAssembler::leave() {
   Unimplemented();
 }
 void MacroAssembler::mult(Register s1, Register s2, Register d) {
   if(VM_Version::v9_instructions_work()) {
     mulx (s1, s2, d);
   } else {
     smul (s1, s2, d);
   }
 }
 void MacroAssembler::mult(Register s1, int simm13a, Register d) {
   if(VM_Version::v9_instructions_work()) {
     mulx (s1, simm13a, d);
   } else {
     smul (s1, simm13a, d);
   }
 }
 #ifdef ASSERT
 void MacroAssembler::read_ccr_v8_assert(Register ccr_save) {
   const Register s1 = G3_scratch;
   const Register s2 = G4_scratch;
   Label get_psr_test;
   // Get the condition codes the V8 way.
   read_ccr_trap(s1);
   mov(ccr_save, s2);
   // This is a test of V8 which has icc but not xcc
   // so mask off the xcc bits
   and3(s2, 0xf, s2);
   // Compare condition codes from the V8 and V9 ways.
   subcc(s2, s1, G0);
   br(Assembler::notEqual, true, Assembler::pt, get_psr_test);
   delayed()->breakpoint_trap();
   bind(get_psr_test);
 }
 void MacroAssembler::write_ccr_v8_assert(Register ccr_save) {
   const Register s1 = G3_scratch;
   const Register s2 = G4_scratch;
   Label set_psr_test;
   // Write out the saved condition codes the V8 way
   write_ccr_trap(ccr_save, s1, s2);
   // Read back the condition codes using the V9 instruction
   rdccr(s1);
   mov(ccr_save, s2);
   // This is a test of V8 which has icc but not xcc
   // so mask off the xcc bits
   and3(s2, 0xf, s2);
   and3(s1, 0xf, s1);
   // Compare the V8 way with the V9 way.
   subcc(s2, s1, G0);
   br(Assembler::notEqual, true, Assembler::pt, set_psr_test);
   delayed()->breakpoint_trap();
   bind(set_psr_test);
 }
 #else
 #define read_ccr_v8_assert(x)
 #define write_ccr_v8_assert(x)
 #endif // ASSERT
 void MacroAssembler::read_ccr(Register ccr_save) {
   if (VM_Version::v9_instructions_work()) {
     rdccr(ccr_save);
     // Test code sequence used on V8.  Do not move above rdccr.
     read_ccr_v8_assert(ccr_save);
   } else {
     read_ccr_trap(ccr_save);
   }
 }
 void MacroAssembler::write_ccr(Register ccr_save) {
   if (VM_Version::v9_instructions_work()) {
     // Test code sequence used on V8.  Do not move below wrccr.
     write_ccr_v8_assert(ccr_save);
     wrccr(ccr_save);
   } else {
     const Register temp_reg1 = G3_scratch;
     const Register temp_reg2 = G4_scratch;
     write_ccr_trap(ccr_save, temp_reg1, temp_reg2);
   }
 }
 // Calls to C land
 #ifdef ASSERT
 // a hook for debugging
 static Thread* reinitialize_thread() {
   return ThreadLocalStorage::thread();
 }
 #else
 #define reinitialize_thread ThreadLocalStorage::thread
 #endif
 #ifdef ASSERT
 address last_get_thread = NULL;
 #endif
 // call this when G2_thread is not known to be valid
 void MacroAssembler::get_thread() {
   save_frame(0);                // to avoid clobbering O0
   mov(G1, L0);                  // avoid clobbering G1
   mov(G5_method, L1);           // avoid clobbering G5
   mov(G3, L2);                  // avoid clobbering G3 also
   mov(G4, L5);                  // avoid clobbering G4
 #ifdef ASSERT
   AddressLiteral last_get_thread_addrlit(&last_get_thread);
   set(last_get_thread_addrlit, L3);
   inc(L4, get_pc(L4) + 2 * BytesPerInstWord); // skip getpc() code + inc + st_ptr to point L4 at call
   st_ptr(L4, L3, 0);
 #endif
   call(CAST_FROM_FN_PTR(address, reinitialize_thread), relocInfo::runtime_call_type);
   delayed()->nop();
   mov(L0, G1);
   mov(L1, G5_method);
   mov(L2, G3);
   mov(L5, G4);
   restore(O0, 0, G2_thread);
 }
 static Thread* verify_thread_subroutine(Thread* gthread_value) {
   Thread* correct_value = ThreadLocalStorage::thread();
   guarantee(gthread_value == correct_value, "G2_thread value must be the thread");
   return correct_value;
 }
 void MacroAssembler::verify_thread() {
   if (VerifyThread) {
     // NOTE: this chops off the heads of the 64-bit O registers.
 #ifdef CC_INTERP
     save_frame(0);
 #else
     // make sure G2_thread contains the right value
     save_frame_and_mov(0, Lmethod, Lmethod);   // to avoid clobbering O0 (and propagate Lmethod for -Xprof)
     mov(G1, L1);                // avoid clobbering G1
     // G2 saved below
     mov(G3, L3);                // avoid clobbering G3
     mov(G4, L4);                // avoid clobbering G4
     mov(G5_method, L5);         // avoid clobbering G5_method
 #endif /* CC_INTERP */
 #if defined(COMPILER2) && !defined(_LP64)
     // Save & restore possible 64-bit Long arguments in G-regs
     srlx(G1,32,L0);
     srlx(G4,32,L6);
 #endif
     call(CAST_FROM_FN_PTR(address,verify_thread_subroutine), relocInfo::runtime_call_type);
     delayed()->mov(G2_thread, O0);
     mov(L1, G1);                // Restore G1
     // G2 restored below
     mov(L3, G3);                // restore G3
     mov(L4, G4);                // restore G4
     mov(L5, G5_method);         // restore G5_method
 #if defined(COMPILER2) && !defined(_LP64)
     // Save & restore possible 64-bit Long arguments in G-regs
     sllx(L0,32,G2);             // Move old high G1 bits high in G2
     srl(G1, 0,G1);              // Clear current high G1 bits
     or3 (G1,G2,G1);             // Recover 64-bit G1
     sllx(L6,32,G2);             // Move old high G4 bits high in G2
     srl(G4, 0,G4);              // Clear current high G4 bits
     or3 (G4,G2,G4);             // Recover 64-bit G4
 #endif
     restore(O0, 0, G2_thread);
   }
 }
 void MacroAssembler::save_thread(const Register thread_cache) {
   verify_thread();
   if (thread_cache->is_valid()) {
     assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
     mov(G2_thread, thread_cache);
   }
   if (VerifyThread) {
     // smash G2_thread, as if the VM were about to anyway
     set(0x67676767, G2_thread);
   }
 }
 void MacroAssembler::restore_thread(const Register thread_cache) {
   if (thread_cache->is_valid()) {
     assert(thread_cache->is_local() || thread_cache->is_in(), "bad volatile");
     mov(thread_cache, G2_thread);
     verify_thread();
   } else {
     // do it the slow way
     get_thread();
   }
 }
 // %%% maybe get rid of [re]set_last_Java_frame
 void MacroAssembler::set_last_Java_frame(Register last_java_sp, Register last_Java_pc) {
   assert_not_delayed();
   Address flags(G2_thread, JavaThread::frame_anchor_offset() +
                            JavaFrameAnchor::flags_offset());
   Address pc_addr(G2_thread, JavaThread::last_Java_pc_offset());
   // Always set last_Java_pc and flags first because once last_Java_sp is visible
   // has_last_Java_frame is true and users will look at the rest of the fields.
   // (Note: flags should always be zero before we get here so doesn't need to be set.)
 #ifdef ASSERT
   // Verify that flags was zeroed on return to Java
   Label PcOk;
   save_frame(0);                // to avoid clobbering O0
   ld_ptr(pc_addr, L0);
   br_null_short(L0, Assembler::pt, PcOk);
   STOP("last_Java_pc not zeroed before leaving Java");
   bind(PcOk);
   // Verify that flags was zeroed on return to Java
   Label FlagsOk;
   ld(flags, L0);
   tst(L0);
   br(Assembler::zero, false, Assembler::pt, FlagsOk);
   delayed() -> restore();
   STOP("flags not zeroed before leaving Java");
   bind(FlagsOk);
 #endif /* ASSERT */
   //
   // When returning from calling out from Java mode the frame anchor's last_Java_pc
   // will always be set to NULL. It is set here so that if we are doing a call to
   // native (not VM) that we capture the known pc and don't have to rely on the
   // native call having a standard frame linkage where we can find the pc.
   if (last_Java_pc->is_valid()) {
     st_ptr(last_Java_pc, pc_addr);
   }
 #ifdef _LP64
 #ifdef ASSERT
   // Make sure that we have an odd stack
   Label StackOk;
   andcc(last_java_sp, 0x01, G0);
   br(Assembler::notZero, false, Assembler::pt, StackOk);
   delayed()->nop();
   STOP("Stack Not Biased in set_last_Java_frame");
   bind(StackOk);
 #endif // ASSERT
   assert( last_java_sp != G4_scratch, "bad register usage in set_last_Java_frame");
   add( last_java_sp, STACK_BIAS, G4_scratch );
   st_ptr(G4_scratch, G2_thread, JavaThread::last_Java_sp_offset());
 #else
   st_ptr(last_java_sp, G2_thread, JavaThread::last_Java_sp_offset());
 #endif // _LP64
 }
 void MacroAssembler::reset_last_Java_frame(void) {
   assert_not_delayed();
   Address sp_addr(G2_thread, JavaThread::last_Java_sp_offset());
   Address pc_addr(G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::last_Java_pc_offset());
   Address flags  (G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::flags_offset());
 #ifdef ASSERT
   // check that it WAS previously set
 #ifdef CC_INTERP
     save_frame(0);
 #else
     save_frame_and_mov(0, Lmethod, Lmethod);     // Propagate Lmethod to helper frame for -Xprof
 #endif /* CC_INTERP */
     ld_ptr(sp_addr, L0);
     tst(L0);
     breakpoint_trap(Assembler::zero, Assembler::ptr_cc);
     restore();
 #endif // ASSERT
   st_ptr(G0, sp_addr);
   // Always return last_Java_pc to zero
   st_ptr(G0, pc_addr);
   // Always null flags after return to Java
   st(G0, flags);
 }
 void MacroAssembler::call_VM_base(
   Register        oop_result,
   Register        thread_cache,
   Register        last_java_sp,
   address         entry_point,
   int             number_of_arguments,
   bool            check_exceptions)
 {
   assert_not_delayed();
   // determine last_java_sp register
   if (!last_java_sp->is_valid()) {
     last_java_sp = SP;
   }
   // debugging support
   assert(number_of_arguments >= 0   , "cannot have negative number of arguments");
   // 64-bit last_java_sp is biased!
   set_last_Java_frame(last_java_sp, noreg);
   if (VerifyThread)  mov(G2_thread, O0); // about to be smashed; pass early
   save_thread(thread_cache);
   // do the call
   call(entry_point, relocInfo::runtime_call_type);
   if (!VerifyThread)
     delayed()->mov(G2_thread, O0);  // pass thread as first argument
   else
     delayed()->nop();             // (thread already passed)
   restore_thread(thread_cache);
   reset_last_Java_frame();
   // check for pending exceptions. use Gtemp as scratch register.
   if (check_exceptions) {
     check_and_forward_exception(Gtemp);
   }
 #ifdef ASSERT
   set(badHeapWordVal, G3);
   set(badHeapWordVal, G4);
   set(badHeapWordVal, G5);
 #endif
   // get oop result if there is one and reset the value in the thread
   if (oop_result->is_valid()) {
     get_vm_result(oop_result);
   }
 }
 void MacroAssembler::check_and_forward_exception(Register scratch_reg)
 {
   Label L;
   check_and_handle_popframe(scratch_reg);
   check_and_handle_earlyret(scratch_reg);
   Address exception_addr(G2_thread, Thread::pending_exception_offset());
   ld_ptr(exception_addr, scratch_reg);
   br_null_short(scratch_reg, pt, L);
   // we use O7 linkage so that forward_exception_entry has the issuing PC
   call(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
   delayed()->nop();
   bind(L);
 }
 void MacroAssembler::check_and_handle_popframe(Register scratch_reg) {
 }
 void MacroAssembler::check_and_handle_earlyret(Register scratch_reg) {
 }
 void MacroAssembler::call_VM(Register oop_result, address entry_point, int number_of_arguments, bool check_exceptions) {
   call_VM_base(oop_result, noreg, noreg, entry_point, number_of_arguments, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   call_VM(oop_result, entry_point, 1, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
   call_VM(oop_result, entry_point, 2, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   mov(arg_2, O2); assert(arg_2 != O1,                "smashed argument");
   mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
   call_VM(oop_result, entry_point, 3, check_exceptions);
 }
 // Note: The following call_VM overloadings are useful when a "save"
 // has already been performed by a stub, and the last Java frame is
 // the previous one.  In that case, last_java_sp must be passed as FP
 // instead of SP.
 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, int number_of_arguments, bool check_exceptions) {
   call_VM_base(oop_result, noreg, last_java_sp, entry_point, number_of_arguments, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   call_VM(oop_result, last_java_sp, entry_point, 1, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   mov(arg_2, O2); assert(arg_2 != O1, "smashed argument");
   call_VM(oop_result, last_java_sp, entry_point, 2, check_exceptions);
 }
 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, Register arg_2, Register arg_3, bool check_exceptions) {
   // O0 is reserved for the thread
   mov(arg_1, O1);
   mov(arg_2, O2); assert(arg_2 != O1,                "smashed argument");
   mov(arg_3, O3); assert(arg_3 != O1 && arg_3 != O2, "smashed argument");
   call_VM(oop_result, last_java_sp, entry_point, 3, check_exceptions);
 }
 void MacroAssembler::call_VM_leaf_base(Register thread_cache, address entry_point, int number_of_arguments) {
   assert_not_delayed();
   save_thread(thread_cache);
   // do the call
   call(entry_point, relocInfo::runtime_call_type);
   delayed()->nop();
   restore_thread(thread_cache);
 #ifdef ASSERT
   set(badHeapWordVal, G3);
   set(badHeapWordVal, G4);
   set(badHeapWordVal, G5);
 #endif
 }
 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, int number_of_arguments) {
   call_VM_leaf_base(thread_cache, entry_point, number_of_arguments);
 }
 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1) {
   mov(arg_1, O0);
   call_VM_leaf(thread_cache, entry_point, 1);
 }
 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2) {
   mov(arg_1, O0);
   mov(arg_2, O1); assert(arg_2 != O0, "smashed argument");
   call_VM_leaf(thread_cache, entry_point, 2);
 }
 void MacroAssembler::call_VM_leaf(Register thread_cache, address entry_point, Register arg_1, Register arg_2, Register arg_3) {
   mov(arg_1, O0);
   mov(arg_2, O1); assert(arg_2 != O0,                "smashed argument");
   mov(arg_3, O2); assert(arg_3 != O0 && arg_3 != O1, "smashed argument");
   call_VM_leaf(thread_cache, entry_point, 3);
 }
 void MacroAssembler::get_vm_result(Register oop_result) {
   verify_thread();
   Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
   ld_ptr(    vm_result_addr, oop_result);
   st_ptr(G0, vm_result_addr);
   verify_oop(oop_result);
 }
 void MacroAssembler::get_vm_result_2(Register metadata_result) {
   verify_thread();
   Address vm_result_addr_2(G2_thread, JavaThread::vm_result_2_offset());
   ld_ptr(vm_result_addr_2, metadata_result);
   st_ptr(G0, vm_result_addr_2);
 }
 // We require that C code which does not return a value in vm_result will
 // leave it undisturbed.
 void MacroAssembler::set_vm_result(Register oop_result) {
   verify_thread();
   Address vm_result_addr(G2_thread, JavaThread::vm_result_offset());
   verify_oop(oop_result);
 # ifdef ASSERT
     // Check that we are not overwriting any other oop.
 #ifdef CC_INTERP
     save_frame(0);
 #else
     save_frame_and_mov(0, Lmethod, Lmethod);     // Propagate Lmethod for -Xprof
 #endif /* CC_INTERP */
     ld_ptr(vm_result_addr, L0);
     tst(L0);
     restore();
     breakpoint_trap(notZero, Assembler::ptr_cc);
     // }
 # endif
   st_ptr(oop_result, vm_result_addr);
 }
 void MacroAssembler::ic_call(address entry, bool emit_delay) {
   RelocationHolder rspec = virtual_call_Relocation::spec(pc());
   patchable_set((intptr_t)Universe::non_oop_word(), G5_inline_cache_reg);
   relocate(rspec);
   call(entry, relocInfo::none);
   if (emit_delay) {
     delayed()->nop();
   }
 }
 void MacroAssembler::card_table_write(jbyte* byte_map_base,
                                       Register tmp, Register obj) {
 #ifdef _LP64
   srlx(obj, CardTableModRefBS::card_shift, obj);
 #else
   srl(obj, CardTableModRefBS::card_shift, obj);
 #endif
   assert(tmp != obj, "need separate temp reg");
   set((address) byte_map_base, tmp);
   stb(G0, tmp, obj);
 }
 void MacroAssembler::internal_sethi(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
   address save_pc;
   int shiftcnt;
 #ifdef _LP64
 # ifdef CHECK_DELAY
   assert_not_delayed((char*) "cannot put two instructions in delay slot");
 # endif
   v9_dep();
   save_pc = pc();
   int msb32 = (int) (addrlit.value() >> 32);
   int lsb32 = (int) (addrlit.value());
   if (msb32 == 0 && lsb32 >= 0) {
     Assembler::sethi(lsb32, d, addrlit.rspec());
   }
   else if (msb32 == -1) {
     Assembler::sethi(~lsb32, d, addrlit.rspec());
     xor3(d, ~low10(~0), d);
   }
   else {
     Assembler::sethi(msb32, d, addrlit.rspec());  // msb 22-bits
     if (msb32 & 0x3ff)                            // Any bits?
       or3(d, msb32 & 0x3ff, d);                   // msb 32-bits are now in lsb 32
     if (lsb32 & 0xFFFFFC00) {                     // done?
       if ((lsb32 >> 20) & 0xfff) {                // Any bits set?
         sllx(d, 12, d);                           // Make room for next 12 bits
         or3(d, (lsb32 >> 20) & 0xfff, d);         // Or in next 12
         shiftcnt = 0;                             // We already shifted
       }
       else
         shiftcnt = 12;
       if ((lsb32 >> 10) & 0x3ff) {
         sllx(d, shiftcnt + 10, d);                // Make room for last 10 bits
         or3(d, (lsb32 >> 10) & 0x3ff, d);         // Or in next 10
         shiftcnt = 0;
       }
       else
         shiftcnt = 10;
       sllx(d, shiftcnt + 10, d);                  // Shift leaving disp field 0'd
     }
     else
       sllx(d, 32, d);
   }
   // Pad out the instruction sequence so it can be patched later.
   if (ForceRelocatable || (addrlit.rtype() != relocInfo::none &&
                            addrlit.rtype() != relocInfo::runtime_call_type)) {
     while (pc() < (save_pc + (7 * BytesPerInstWord)))
       nop();
   }
 #else
   Assembler::sethi(addrlit.value(), d, addrlit.rspec());
 #endif
 }
 void MacroAssembler::sethi(const AddressLiteral& addrlit, Register d) {
   internal_sethi(addrlit, d, false);
 }
 void MacroAssembler::patchable_sethi(const AddressLiteral& addrlit, Register d) {
   internal_sethi(addrlit, d, true);
 }
 int MacroAssembler::insts_for_sethi(address a, bool worst_case) {
 #ifdef _LP64
   if (worst_case)  return 7;
   intptr_t iaddr = (intptr_t) a;
   int msb32 = (int) (iaddr >> 32);
   int lsb32 = (int) (iaddr);
   int count;
   if (msb32 == 0 && lsb32 >= 0)
     count = 1;
   else if (msb32 == -1)
     count = 2;
   else {
     count = 2;
     if (msb32 & 0x3ff)
       count++;
     if (lsb32 & 0xFFFFFC00 ) {
       if ((lsb32 >> 20) & 0xfff)  count += 2;
       if ((lsb32 >> 10) & 0x3ff)  count += 2;
     }
   }
   return count;
 #else
   return 1;
 #endif
 }
 int MacroAssembler::worst_case_insts_for_set() {
   return insts_for_sethi(NULL, true) + 1;
 }
 // Keep in sync with MacroAssembler::insts_for_internal_set
 void MacroAssembler::internal_set(const AddressLiteral& addrlit, Register d, bool ForceRelocatable) {
   intptr_t value = addrlit.value();
   if (!ForceRelocatable && addrlit.rspec().type() == relocInfo::none) {
     // can optimize
     if (-4096 <= value && value <= 4095) {
       or3(G0, value, d); // setsw (this leaves upper 32 bits sign-extended)
       return;
     }
     if (inv_hi22(hi22(value)) == value) {
       sethi(addrlit, d);
       return;
     }
   }
   assert_not_delayed((char*) "cannot put two instructions in delay slot");
   internal_sethi(addrlit, d, ForceRelocatable);
   if (ForceRelocatable || addrlit.rspec().type() != relocInfo::none || addrlit.low10() != 0) {
     add(d, addrlit.low10(), d, addrlit.rspec());
   }
 }
 // Keep in sync with MacroAssembler::internal_set
 int MacroAssembler::insts_for_internal_set(intptr_t value) {
   // can optimize
   if (-4096 <= value && value <= 4095) {
     return 1;
   }
   if (inv_hi22(hi22(value)) == value) {
     return insts_for_sethi((address) value);
   }
   int count = insts_for_sethi((address) value);
   AddressLiteral al(value);
   if (al.low10() != 0) {
     count++;
   }
   return count;
 }
 void MacroAssembler::set(const AddressLiteral& al, Register d) {
   internal_set(al, d, false);
 }
 void MacroAssembler::set(intptr_t value, Register d) {
   AddressLiteral al(value);
   internal_set(al, d, false);
 }
 void MacroAssembler::set(address addr, Register d, RelocationHolder const& rspec) {
   AddressLiteral al(addr, rspec);
   internal_set(al, d, false);
 }
 void MacroAssembler::patchable_set(const AddressLiteral& al, Register d) {
   internal_set(al, d, true);
 }
 void MacroAssembler::patchable_set(intptr_t value, Register d) {
   AddressLiteral al(value);
   internal_set(al, d, true);
 }
 void MacroAssembler::set64(jlong value, Register d, Register tmp) {
   assert_not_delayed();
   v9_dep();
   int hi = (int)(value >> 32);
   int lo = (int)(value & ~0);
   // (Matcher::isSimpleConstant64 knows about the following optimizations.)
   if (Assembler::is_simm13(lo) && value == lo) {
     or3(G0, lo, d);
   } else if (hi == 0) {
     Assembler::sethi(lo, d);   // hardware version zero-extends to upper 32
     if (low10(lo) != 0)
       or3(d, low10(lo), d);
   }
   else if (hi == -1) {
     Assembler::sethi(~lo, d);  // hardware version zero-extends to upper 32
     xor3(d, low10(lo) ^ ~low10(~0), d);
   }
   else if (lo == 0) {
     if (Assembler::is_simm13(hi)) {
       or3(G0, hi, d);
     } else {
       Assembler::sethi(hi, d);   // hardware version zero-extends to upper 32
       if (low10(hi) != 0)
         or3(d, low10(hi), d);
     }
     sllx(d, 32, d);
   }
   else {
     Assembler::sethi(hi, tmp);
     Assembler::sethi(lo,   d); // macro assembler version sign-extends
     if (low10(hi) != 0)
       or3 (tmp, low10(hi), tmp);
     if (low10(lo) != 0)
       or3 (  d, low10(lo),   d);
     sllx(tmp, 32, tmp);
     or3 (d, tmp, d);
   }
 }
 int MacroAssembler::insts_for_set64(jlong value) {
   v9_dep();
   int hi = (int) (value >> 32);
   int lo = (int) (value & ~0);
   int count = 0;
   // (Matcher::isSimpleConstant64 knows about the following optimizations.)
   if (Assembler::is_simm13(lo) && value == lo) {
     count++;
   } else if (hi == 0) {
     count++;
     if (low10(lo) != 0)
       count++;
   }
   else if (hi == -1) {
     count += 2;
   }
   else if (lo == 0) {
     if (Assembler::is_simm13(hi)) {
       count++;
     } else {
       count++;
       if (low10(hi) != 0)
         count++;
     }
     count++;
   }
   else {
     count += 2;
     if (low10(hi) != 0)
       count++;
     if (low10(lo) != 0)
       count++;
     count += 2;
   }
   return count;
 }
 // compute size in bytes of sparc frame, given
 // number of extraWords
 int MacroAssembler::total_frame_size_in_bytes(int extraWords) {
   int nWords = frame::memory_parameter_word_sp_offset;
   nWords += extraWords;
   if (nWords & 1) ++nWords; // round up to double-word
   return nWords * BytesPerWord;
 }
 // save_frame: given number of "extra" words in frame,
 // issue approp. save instruction (p 200, v8 manual)
 void MacroAssembler::save_frame(int extraWords) {
   int delta = -total_frame_size_in_bytes(extraWords);
   if (is_simm13(delta)) {
     save(SP, delta, SP);
   } else {
     set(delta, G3_scratch);
     save(SP, G3_scratch, SP);
   }
 }
 void MacroAssembler::save_frame_c1(int size_in_bytes) {
   if (is_simm13(-size_in_bytes)) {
     save(SP, -size_in_bytes, SP);
   } else {
     set(-size_in_bytes, G3_scratch);
     save(SP, G3_scratch, SP);
   }
 }
 void MacroAssembler::save_frame_and_mov(int extraWords,
                                         Register s1, Register d1,
                                         Register s2, Register d2) {
   assert_not_delayed();
   // The trick here is to use precisely the same memory word
   // that trap handlers also use to save the register.
   // This word cannot be used for any other purpose, but
   // it works fine to save the register's value, whether or not
   // an interrupt flushes register windows at any given moment!
   Address s1_addr;
   if (s1->is_valid() && (s1->is_in() || s1->is_local())) {
     s1_addr = s1->address_in_saved_window();
     st_ptr(s1, s1_addr);
   }
   Address s2_addr;
   if (s2->is_valid() && (s2->is_in() || s2->is_local())) {
     s2_addr = s2->address_in_saved_window();
     st_ptr(s2, s2_addr);
   }
   save_frame(extraWords);
   if (s1_addr.base() == SP) {
     ld_ptr(s1_addr.after_save(), d1);
   } else if (s1->is_valid()) {
     mov(s1->after_save(), d1);
   }
   if (s2_addr.base() == SP) {
     ld_ptr(s2_addr.after_save(), d2);
   } else if (s2->is_valid()) {
     mov(s2->after_save(), d2);
   }
 }
 AddressLiteral MacroAssembler::allocate_metadata_address(Metadata* obj) {
   assert(oop_recorder() != NULL, "this assembler needs a Recorder");
   int index = oop_recorder()->allocate_metadata_index(obj);
   RelocationHolder rspec = metadata_Relocation::spec(index);
   return AddressLiteral((address)obj, rspec);
 }
 AddressLiteral MacroAssembler::constant_metadata_address(Metadata* obj) {
   assert(oop_recorder() != NULL, "this assembler needs a Recorder");
   int index = oop_recorder()->find_index(obj);
   RelocationHolder rspec = metadata_Relocation::spec(index);
   return AddressLiteral((address)obj, rspec);
 }
 AddressLiteral MacroAssembler::constant_oop_address(jobject obj) {
   assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
   assert(Universe::heap()->is_in_reserved(JNIHandles::resolve(obj)), "not an oop");
   int oop_index = oop_recorder()->find_index(obj);
   return AddressLiteral(obj, oop_Relocation::spec(oop_index));
 }
 void  MacroAssembler::set_narrow_oop(jobject obj, Register d) {
   assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
   int oop_index = oop_recorder()->find_index(obj);
   RelocationHolder rspec = oop_Relocation::spec(oop_index);
   assert_not_delayed();
   // Relocation with special format (see relocInfo_sparc.hpp).
   relocate(rspec, 1);
   // Assembler::sethi(0x3fffff, d);
   emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(0x3fffff) );
   // Don't add relocation for 'add'. Do patching during 'sethi' processing.
   add(d, 0x3ff, d);
 }
 void  MacroAssembler::set_narrow_klass(Klass* k, Register d) {
   assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
   int klass_index = oop_recorder()->find_index(k);
   RelocationHolder rspec = metadata_Relocation::spec(klass_index);
   narrowOop encoded_k = oopDesc::encode_klass(k);
   assert_not_delayed();
   // Relocation with special format (see relocInfo_sparc.hpp).
   relocate(rspec, 1);
   // Assembler::sethi(encoded_k, d);
   emit_int32( op(branch_op) | rd(d) | op2(sethi_op2) | hi22(encoded_k) );
   // Don't add relocation for 'add'. Do patching during 'sethi' processing.
   add(d, low10(encoded_k), d);
 }
 void MacroAssembler::align(int modulus) {
   while (offset() % modulus != 0) nop();
 }
 void MacroAssembler::safepoint() {
   relocate(breakpoint_Relocation::spec(breakpoint_Relocation::safepoint));
 }
 void RegistersForDebugging::print(outputStream* s) {
   FlagSetting fs(Debugging, true);
   int j;
   for (j = 0; j < 8; ++j) {
     if (j != 6) { s->print("i%d = ", j); os::print_location(s, i[j]); }
     else        { s->print( "fp = "   ); os::print_location(s, i[j]); }
   }
   s->cr();
   for (j = 0;  j < 8;  ++j) {
     s->print("l%d = ", j); os::print_location(s, l[j]);
   }
   s->cr();
   for (j = 0; j < 8; ++j) {
     if (j != 6) { s->print("o%d = ", j); os::print_location(s, o[j]); }
     else        { s->print( "sp = "   ); os::print_location(s, o[j]); }
   }
   s->cr();
   for (j = 0; j < 8; ++j) {
     s->print("g%d = ", j); os::print_location(s, g[j]);
   }
   s->cr();
   // print out floats with compression
   for (j = 0; j < 32; ) {
     jfloat val = f[j];
     int last = j;
     for ( ;  last+1 < 32;  ++last ) {
       char b1[1024], b2[1024];
       sprintf(b1, "%f", val);
       sprintf(b2, "%f", f[last+1]);
       if (strcmp(b1, b2))
         break;
     }
     s->print("f%d", j);
     if ( j != last )  s->print(" - f%d", last);
     s->print(" = %f", val);
     s->fill_to(25);
     s->print_cr(" (0x%x)", val);
     j = last + 1;
   }
   s->cr();
   // and doubles (evens only)
   for (j = 0; j < 32; ) {
     jdouble val = d[j];
     int last = j;
     for ( ;  last+1 < 32;  ++last ) {
       char b1[1024], b2[1024];
       sprintf(b1, "%f", val);
       sprintf(b2, "%f", d[last+1]);
       if (strcmp(b1, b2))
         break;
     }
     s->print("d%d", 2 * j);
     if ( j != last )  s->print(" - d%d", last);
     s->print(" = %f", val);
     s->fill_to(30);
     s->print("(0x%x)", *(int*)&val);
     s->fill_to(42);
     s->print_cr("(0x%x)", *(1 + (int*)&val));
     j = last + 1;
   }
   s->cr();
 }
 void RegistersForDebugging::save_registers(MacroAssembler* a) {
   a->sub(FP, round_to(sizeof(RegistersForDebugging), sizeof(jdouble)) - STACK_BIAS, O0);
   a->flush_windows();
   int i;
   for (i = 0; i < 8; ++i) {
     a->ld_ptr(as_iRegister(i)->address_in_saved_window().after_save(), L1);  a->st_ptr( L1, O0, i_offset(i));
     a->ld_ptr(as_lRegister(i)->address_in_saved_window().after_save(), L1);  a->st_ptr( L1, O0, l_offset(i));
     a->st_ptr(as_oRegister(i)->after_save(), O0, o_offset(i));
     a->st_ptr(as_gRegister(i)->after_save(), O0, g_offset(i));
   }
   for (i = 0;  i < 32; ++i) {
     a->stf(FloatRegisterImpl::S, as_FloatRegister(i), O0, f_offset(i));
   }
   for (i = 0; i < (VM_Version::v9_instructions_work() ? 64 : 32); i += 2) {
     a->stf(FloatRegisterImpl::D, as_FloatRegister(i), O0, d_offset(i));
   }
 }
 void RegistersForDebugging::restore_registers(MacroAssembler* a, Register r) {
   for (int i = 1; i < 8;  ++i) {
     a->ld_ptr(r, g_offset(i), as_gRegister(i));
   }
   for (int j = 0; j < 32; ++j) {
     a->ldf(FloatRegisterImpl::S, O0, f_offset(j), as_FloatRegister(j));
   }
   for (int k = 0; k < (VM_Version::v9_instructions_work() ? 64 : 32); k += 2) {
     a->ldf(FloatRegisterImpl::D, O0, d_offset(k), as_FloatRegister(k));
   }
 }
 // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
 void MacroAssembler::push_fTOS() {
   // %%%%%% need to implement this
 }
 // pops double TOS element from CPU stack and pushes on FPU stack
 void MacroAssembler::pop_fTOS() {
   // %%%%%% need to implement this
 }
 void MacroAssembler::empty_FPU_stack() {
   // %%%%%% need to implement this
 }
 void MacroAssembler::_verify_oop(Register reg, const char* msg, const char * file, int line) {
   // plausibility check for oops
   if (!VerifyOops) return;
   if (reg == G0)  return;       // always NULL, which is always an oop
   BLOCK_COMMENT("verify_oop {");
   char buffer[64];
 #ifdef COMPILER1
   if (CommentedAssembly) {
     snprintf(buffer, sizeof(buffer), "verify_oop at %d", offset());
     block_comment(buffer);
   }
 #endif
   const char* real_msg = NULL;
   {
     ResourceMark rm;
     stringStream ss;
     ss.print("%s at offset %d (%s:%d)", msg, offset(), file, line);
     real_msg = code_string(ss.as_string());
   }
   // Call indirectly to solve generation ordering problem
   AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
   // Make some space on stack above the current register window.
   // Enough to hold 8 64-bit registers.
   add(SP,-8*8,SP);
   // Save some 64-bit registers; a normal 'save' chops the heads off
   // of 64-bit longs in the 32-bit build.
   stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
   stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
   mov(reg,O0); // Move arg into O0; arg might be in O7 which is about to be crushed
   stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
   // Size of set() should stay the same
   patchable_set((intptr_t)real_msg, O1);
   // Load address to call to into O7
   load_ptr_contents(a, O7);
   // Register call to verify_oop_subroutine
   callr(O7, G0);
   delayed()->nop();
   // recover frame size
   add(SP, 8*8,SP);
   BLOCK_COMMENT("} verify_oop");
 }
 void MacroAssembler::_verify_oop_addr(Address addr, const char* msg, const char * file, int line) {
   // plausibility check for oops
   if (!VerifyOops) return;
   const char* real_msg = NULL;
   {
     ResourceMark rm;
     stringStream ss;
     ss.print("%s at SP+%d (%s:%d)", msg, addr.disp(), file, line);
     real_msg = code_string(ss.as_string());
   }
   // Call indirectly to solve generation ordering problem
   AddressLiteral a(StubRoutines::verify_oop_subroutine_entry_address());
   // Make some space on stack above the current register window.
   // Enough to hold 8 64-bit registers.
   add(SP,-8*8,SP);
   // Save some 64-bit registers; a normal 'save' chops the heads off
   // of 64-bit longs in the 32-bit build.
   stx(O0,SP,frame::register_save_words*wordSize+STACK_BIAS+0*8);
   stx(O1,SP,frame::register_save_words*wordSize+STACK_BIAS+1*8);
   ld_ptr(addr.base(), addr.disp() + 8*8, O0); // Load arg into O0; arg might be in O7 which is about to be crushed
   stx(O7,SP,frame::register_save_words*wordSize+STACK_BIAS+7*8);
   // Size of set() should stay the same
   patchable_set((intptr_t)real_msg, O1);
   // Load address to call to into O7
   load_ptr_contents(a, O7);
   // Register call to verify_oop_subroutine
   callr(O7, G0);
   delayed()->nop();
   // recover frame size
   add(SP, 8*8,SP);
 }
 // side-door communication with signalHandler in os_solaris.cpp
 address MacroAssembler::_verify_oop_implicit_branch[3] = { NULL };
 // This macro is expanded just once; it creates shared code.  Contract:
 // receives an oop in O0.  Must restore O0 & O7 from TLS.  Must not smash ANY
 // registers, including flags.  May not use a register 'save', as this blows
 // the high bits of the O-regs if they contain Long values.  Acts as a 'leaf'
 // call.
 void MacroAssembler::verify_oop_subroutine() {
   assert( VM_Version::v9_instructions_work(), "VerifyOops not supported for V8" );
   // Leaf call; no frame.
   Label succeed, fail, null_or_fail;
   // O0 and O7 were saved already (O0 in O0's TLS home, O7 in O5's TLS home).
   // O0 is now the oop to be checked.  O7 is the return address.
   Register O0_obj = O0;
   // Save some more registers for temps.
   stx(O2,SP,frame::register_save_words*wordSize+STACK_BIAS+2*8);
   stx(O3,SP,frame::register_save_words*wordSize+STACK_BIAS+3*8);
   stx(O4,SP,frame::register_save_words*wordSize+STACK_BIAS+4*8);
   stx(O5,SP,frame::register_save_words*wordSize+STACK_BIAS+5*8);
   // Save flags
   Register O5_save_flags = O5;
   rdccr( O5_save_flags );
   { // count number of verifies
     Register O2_adr   = O2;
     Register O3_accum = O3;
     inc_counter(StubRoutines::verify_oop_count_addr(), O2_adr, O3_accum);
   }
   Register O2_mask = O2;
   Register O3_bits = O3;
   Register O4_temp = O4;
   // mark lower end of faulting range
   assert(_verify_oop_implicit_branch[0] == NULL, "set once");
   _verify_oop_implicit_branch[0] = pc();
   // We can't check the mark oop because it could be in the process of
   // locking or unlocking while this is running.
   set(Universe::verify_oop_mask (), O2_mask);
   set(Universe::verify_oop_bits (), O3_bits);
   // assert((obj & oop_mask) == oop_bits);
   and3(O0_obj, O2_mask, O4_temp);
   cmp_and_brx_short(O4_temp, O3_bits, notEqual, pn, null_or_fail);
   if ((NULL_WORD & Universe::verify_oop_mask()) == Universe::verify_oop_bits()) {
     // the null_or_fail case is useless; must test for null separately
     br_null_short(O0_obj, pn, succeed);
   }
   // Check the Klass* of this object for being in the right area of memory.
   // Cannot do the load in the delay above slot in case O0 is null
   load_klass(O0_obj, O0_obj);
   // assert((klass != NULL)
   br_null_short(O0_obj, pn, fail);
   // TODO: Future assert that klass is lower 4g memory for UseCompressedKlassPointers
   wrccr( O5_save_flags ); // Restore CCR's
   // mark upper end of faulting range
   _verify_oop_implicit_branch[1] = pc();
   //-----------------------
   // all tests pass
   bind(succeed);
   // Restore prior 64-bit registers
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+0*8,O0);
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+1*8,O1);
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+2*8,O2);
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+3*8,O3);
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+4*8,O4);
   ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+5*8,O5);
   retl();                       // Leaf return; restore prior O7 in delay slot
   delayed()->ldx(SP,frame::register_save_words*wordSize+STACK_BIAS+7*8,O7);
   //-----------------------
   bind(null_or_fail);           // nulls are less common but OK
   br_null(O0_obj, false, pt, succeed);
   delayed()->wrccr( O5_save_flags ); // Restore CCR's
   //-----------------------
   // report failure:
   bind(fail);
   _verify_oop_implicit_branch[2] = pc();
   wrccr( O5_save_flags ); // Restore CCR's
   save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
   // stop_subroutine expects message pointer in I1.
   mov(I1, O1);
   // Restore prior 64-bit registers
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+0*8,I0);
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+1*8,I1);
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+2*8,I2);
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+3*8,I3);
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+4*8,I4);
   ldx(FP,frame::register_save_words*wordSize+STACK_BIAS+5*8,I5);
   // factor long stop-sequence into subroutine to save space
   assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
   // call indirectly to solve generation ordering problem
   AddressLiteral al(StubRoutines::Sparc::stop_subroutine_entry_address());
   load_ptr_contents(al, O5);
   jmpl(O5, 0, O7);
   delayed()->nop();
 }
 void MacroAssembler::stop(const char* msg) {
   // save frame first to get O7 for return address
   // add one word to size in case struct is odd number of words long
   // It must be doubleword-aligned for storing doubles into it.
     save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
     // stop_subroutine expects message pointer in I1.
     // Size of set() should stay the same
     patchable_set((intptr_t)msg, O1);
     // factor long stop-sequence into subroutine to save space
     assert(StubRoutines::Sparc::stop_subroutine_entry_address(), "hasn't been generated yet");
     // call indirectly to solve generation ordering problem
     AddressLiteral a(StubRoutines::Sparc::stop_subroutine_entry_address());
     load_ptr_contents(a, O5);
     jmpl(O5, 0, O7);
     delayed()->nop();
     breakpoint_trap();   // make stop actually stop rather than writing
                          // unnoticeable results in the output files.
     // restore(); done in callee to save space!
 }
 void MacroAssembler::warn(const char* msg) {
   save_frame(::round_to(sizeof(RegistersForDebugging) / BytesPerWord, 2));
   RegistersForDebugging::save_registers(this);
   mov(O0, L0);
   // Size of set() should stay the same
   patchable_set((intptr_t)msg, O0);
   call( CAST_FROM_FN_PTR(address, warning) );
   delayed()->nop();
 //  ret();
 //  delayed()->restore();
   RegistersForDebugging::restore_registers(this, L0);
   restore();
 }
 void MacroAssembler::untested(const char* what) {
   // We must be able to turn interactive prompting off
   // in order to run automated test scripts on the VM
   // Use the flag ShowMessageBoxOnError
   const char* b = NULL;
   {
     ResourceMark rm;
     stringStream ss;
     ss.print("untested: %s", what);
     b = code_string(ss.as_string());
   }
   if (ShowMessageBoxOnError) { STOP(b); }
   else                       { warn(b); }
 }
 void MacroAssembler::stop_subroutine() {
   RegistersForDebugging::save_registers(this);
   // for the sake of the debugger, stick a PC on the current frame
   // (this assumes that the caller has performed an extra "save")
   mov(I7, L7);
   add(O7, -7 * BytesPerInt, I7);
   save_frame(); // one more save to free up another O7 register
   mov(I0, O1); // addr of reg save area
   // We expect pointer to message in I1. Caller must set it up in O1
   mov(I1, O0); // get msg
   call (CAST_FROM_FN_PTR(address, MacroAssembler::debug), relocInfo::runtime_call_type);
   delayed()->nop();
   restore();
   RegistersForDebugging::restore_registers(this, O0);
   save_frame(0);
   call(CAST_FROM_FN_PTR(address,breakpoint));
   delayed()->nop();
   restore();
   mov(L7, I7);
   retl();
   delayed()->restore(); // see stop above
 }
 void MacroAssembler::debug(char* msg, RegistersForDebugging* regs) {
   if ( ShowMessageBoxOnError ) {
     JavaThread* thread = JavaThread::current();
     JavaThreadState saved_state = thread->thread_state();
     thread->set_thread_state(_thread_in_vm);
       {
         // In order to get locks work, we need to fake a in_VM state
         ttyLocker ttyl;
         ::tty->print_cr("EXECUTION STOPPED: %s\n", msg);
         if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
         BytecodeCounter::print();
         }
         if (os::message_box(msg, "Execution stopped, print registers?"))
           regs->print(::tty);
       }
     BREAKPOINT;
       ThreadStateTransition::transition(JavaThread::current(), _thread_in_vm, saved_state);
   }
   else {
      ::tty->print_cr("=============== DEBUG MESSAGE: %s ================\n", msg);
   }
   assert(false, err_msg("DEBUG MESSAGE: %s", msg));
 }
 void MacroAssembler::calc_mem_param_words(Register Rparam_words, Register Rresult) {
   subcc( Rparam_words, Argument::n_register_parameters, Rresult); // how many mem words?
   Label no_extras;
   br( negative, true, pt, no_extras ); // if neg, clear reg
   delayed()->set(0, Rresult);          // annuled, so only if taken
   bind( no_extras );
 }
 void MacroAssembler::calc_frame_size(Register Rextra_words, Register Rresult) {
 #ifdef _LP64
   add(Rextra_words, frame::memory_parameter_word_sp_offset, Rresult);
 #else
   add(Rextra_words, frame::memory_parameter_word_sp_offset + 1, Rresult);
 #endif
   bclr(1, Rresult);
   sll(Rresult, LogBytesPerWord, Rresult);  // Rresult has total frame bytes
 }
 void MacroAssembler::calc_frame_size_and_save(Register Rextra_words, Register Rresult) {
   calc_frame_size(Rextra_words, Rresult);
   neg(Rresult);
   save(SP, Rresult, SP);
 }
 // ---------------------------------------------------------
 Assembler::RCondition cond2rcond(Assembler::Condition c) {
   switch (c) {
     /*case zero: */
     case Assembler::equal:        return Assembler::rc_z;
     case Assembler::lessEqual:    return Assembler::rc_lez;
     case Assembler::less:         return Assembler::rc_lz;
     /*case notZero:*/
     case Assembler::notEqual:     return Assembler::rc_nz;
     case Assembler::greater:      return Assembler::rc_gz;
     case Assembler::greaterEqual: return Assembler::rc_gez;
   }
   ShouldNotReachHere();
   return Assembler::rc_z;
 }
 // compares (32 bit) register with zero and branches.  NOT FOR USE WITH 64-bit POINTERS
 void MacroAssembler::cmp_zero_and_br(Condition c, Register s1, Label& L, bool a, Predict p) {
   tst(s1);
   br (c, a, p, L);
 }
 // Compares a pointer register with zero and branches on null.
 // Does a test & branch on 32-bit systems and a register-branch on 64-bit.
 void MacroAssembler::br_null( Register s1, bool a, Predict p, Label& L ) {
   assert_not_delayed();
 #ifdef _LP64
   bpr( rc_z, a, p, s1, L );
 #else
   tst(s1);
   br ( zero, a, p, L );
 #endif
 }
 void MacroAssembler::br_notnull( Register s1, bool a, Predict p, Label& L ) {
   assert_not_delayed();
 #ifdef _LP64
   bpr( rc_nz, a, p, s1, L );
 #else
   tst(s1);
   br ( notZero, a, p, L );
 #endif
 }
 // Compare registers and branch with nop in delay slot or cbcond without delay slot.
 // Compare integer (32 bit) values (icc only).
 void MacroAssembler::cmp_and_br_short(Register s1, Register s2, Condition c,
                                       Predict p, Label& L) {
   assert_not_delayed();
   if (use_cbcond(L)) {
     Assembler::cbcond(c, icc, s1, s2, L);
   } else {
     cmp(s1, s2);
     br(c, false, p, L);
     delayed()->nop();
   }
 }
 // Compare integer (32 bit) values (icc only).
 void MacroAssembler::cmp_and_br_short(Register s1, int simm13a, Condition c,
                                       Predict p, Label& L) {
   assert_not_delayed();
   if (is_simm(simm13a,5) && use_cbcond(L)) {
     Assembler::cbcond(c, icc, s1, simm13a, L);
   } else {
     cmp(s1, simm13a);
     br(c, false, p, L);
     delayed()->nop();
   }
 }
 // Branch that tests xcc in LP64 and icc in !LP64
 void MacroAssembler::cmp_and_brx_short(Register s1, Register s2, Condition c,
                                        Predict p, Label& L) {
   assert_not_delayed();
   if (use_cbcond(L)) {
     Assembler::cbcond(c, ptr_cc, s1, s2, L);
   } else {
     cmp(s1, s2);
     brx(c, false, p, L);
     delayed()->nop();
   }
 }
 // Branch that tests xcc in LP64 and icc in !LP64
 void MacroAssembler::cmp_and_brx_short(Register s1, int simm13a, Condition c,
                                        Predict p, Label& L) {
   assert_not_delayed();
   if (is_simm(simm13a,5) && use_cbcond(L)) {
     Assembler::cbcond(c, ptr_cc, s1, simm13a, L);
   } else {
     cmp(s1, simm13a);
     brx(c, false, p, L);
     delayed()->nop();
   }
 }
 // Short branch version for compares a pointer with zero.
 void MacroAssembler::br_null_short(Register s1, Predict p, Label& L) {
   assert_not_delayed();
   if (use_cbcond(L)) {
     Assembler::cbcond(zero, ptr_cc, s1, 0, L);
     return;
   }
   br_null(s1, false, p, L);
   delayed()->nop();
 }
 void MacroAssembler::br_notnull_short(Register s1, Predict p, Label& L) {
   assert_not_delayed();
   if (use_cbcond(L)) {
     Assembler::cbcond(notZero, ptr_cc, s1, 0, L);
     return;
   }
   br_notnull(s1, false, p, L);
   delayed()->nop();
 }
 // Unconditional short branch
 void MacroAssembler::ba_short(Label& L) {
   if (use_cbcond(L)) {
     Assembler::cbcond(equal, icc, G0, G0, L);
     return;
   }
   br(always, false, pt, L);
   delayed()->nop();
 }
 // instruction sequences factored across compiler & interpreter
 void MacroAssembler::lcmp( Register Ra_hi, Register Ra_low,
                            Register Rb_hi, Register Rb_low,
                            Register Rresult) {
   Label check_low_parts, done;
   cmp(Ra_hi, Rb_hi );  // compare hi parts
   br(equal, true, pt, check_low_parts);
   delayed()->cmp(Ra_low, Rb_low); // test low parts
   // And, with an unsigned comparison, it does not matter if the numbers
   // are negative or not.
   // E.g., -2 cmp -1: the low parts are 0xfffffffe and 0xffffffff.
   // The second one is bigger (unsignedly).
   // Other notes:  The first move in each triplet can be unconditional
   // (and therefore probably prefetchable).
   // And the equals case for the high part does not need testing,
   // since that triplet is reached only after finding the high halves differ.
   if (VM_Version::v9_instructions_work()) {
     mov(-1, Rresult);
     ba(done);  delayed()-> movcc(greater, false, icc,  1, Rresult);
   } else {
     br(less,    true, pt, done); delayed()-> set(-1, Rresult);
     br(greater, true, pt, done); delayed()-> set( 1, Rresult);
   }
   bind( check_low_parts );
   if (VM_Version::v9_instructions_work()) {
     mov(                               -1, Rresult);
     movcc(equal,           false, icc,  0, Rresult);
     movcc(greaterUnsigned, false, icc,  1, Rresult);
   } else {
     set(-1, Rresult);
     br(equal,           true, pt, done); delayed()->set( 0, Rresult);
     br(greaterUnsigned, true, pt, done); delayed()->set( 1, Rresult);
   }
   bind( done );
 }
 void MacroAssembler::lneg( Register Rhi, Register Rlow ) {
   subcc(  G0, Rlow, Rlow );
   subc(   G0, Rhi,  Rhi  );
 }
 void MacroAssembler::lshl( Register Rin_high,  Register Rin_low,
                            Register Rcount,
                            Register Rout_high, Register Rout_low,
                            Register Rtemp ) {
   Register Ralt_count = Rtemp;
   Register Rxfer_bits = Rtemp;
   assert( Ralt_count != Rin_high
       &&  Ralt_count != Rin_low
       &&  Ralt_count != Rcount
       &&  Rxfer_bits != Rin_low
       &&  Rxfer_bits != Rin_high
       &&  Rxfer_bits != Rcount
       &&  Rxfer_bits != Rout_low
       &&  Rout_low   != Rin_high,
         "register alias checks");
   Label big_shift, done;
   // This code can be optimized to use the 64 bit shifts in V9.
   // Here we use the 32 bit shifts.
   and3( Rcount, 0x3f, Rcount);     // take least significant 6 bits
   subcc(Rcount,   31, Ralt_count);
   br(greater, true, pn, big_shift);
   delayed()->dec(Ralt_count);
   // shift < 32 bits, Ralt_count = Rcount-31
   // We get the transfer bits by shifting right by 32-count the low
   // register. This is done by shifting right by 31-count and then by one
   // more to take care of the special (rare) case where count is zero
   // (shifting by 32 would not work).
   neg(Ralt_count);
   // The order of the next two instructions is critical in the case where
   // Rin and Rout are the same and should not be reversed.
   srl(Rin_low, Ralt_count, Rxfer_bits); // shift right by 31-count
   if (Rcount != Rout_low) {
     sll(Rin_low, Rcount, Rout_low); // low half
   }
   sll(Rin_high, Rcount, Rout_high);
   if (Rcount == Rout_low) {
     sll(Rin_low, Rcount, Rout_low); // low half
   }
   srl(Rxfer_bits, 1, Rxfer_bits ); // shift right by one more
   ba(done);
   delayed()->or3(Rout_high, Rxfer_bits, Rout_high);   // new hi value: or in shifted old hi part and xfer from low
   // shift >= 32 bits, Ralt_count = Rcount-32
   bind(big_shift);
   sll(Rin_low, Ralt_count, Rout_high  );
   clr(Rout_low);
   bind(done);
 }
 void MacroAssembler::lshr( Register Rin_high,  Register Rin_low,
                            Register Rcount,
                            Register Rout_high, Register Rout_low,
                            Register Rtemp ) {
   Register Ralt_count = Rtemp;
   Register Rxfer_bits = Rtemp;
   assert( Ralt_count != Rin_high
       &&  Ralt_count != Rin_low
       &&  Ralt_count != Rcount
       &&  Rxfer_bits != Rin_low
       &&  Rxfer_bits != Rin_high
       &&  Rxfer_bits != Rcount
       &&  Rxfer_bits != Rout_high
       &&  Rout_high  != Rin_low,
         "register alias checks");
   Label big_shift, done;
   // This code can be optimized to use the 64 bit shifts in V9.
   // Here we use the 32 bit shifts.
   and3( Rcount, 0x3f, Rcount);     // take least significant 6 bits
   subcc(Rcount,   31, Ralt_count);
   br(greater, true, pn, big_shift);
   delayed()->dec(Ralt_count);
   // shift < 32 bits, Ralt_count = Rcount-31
   // We get the transfer bits by shifting left by 32-count the high
   // register. This is done by shifting left by 31-count and then by one
   // more to take care of the special (rare) case where count is zero
   // (shifting by 32 would not work).
   neg(Ralt_count);
   if (Rcount != Rout_low) {
     srl(Rin_low, Rcount, Rout_low);
   }
   // The order of the next two instructions is critical in the case where
   // Rin and Rout are the same and should not be reversed.
   sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
   sra(Rin_high,     Rcount, Rout_high ); // high half
   sll(Rxfer_bits,        1, Rxfer_bits); // shift left by one more
   if (Rcount == Rout_low) {
     srl(Rin_low, Rcount, Rout_low);
   }
   ba(done);
   delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
   // shift >= 32 bits, Ralt_count = Rcount-32
   bind(big_shift);
   sra(Rin_high, Ralt_count, Rout_low);
   sra(Rin_high,         31, Rout_high); // sign into hi
   bind( done );
 }
 void MacroAssembler::lushr( Register Rin_high,  Register Rin_low,
                             Register Rcount,
                             Register Rout_high, Register Rout_low,
                             Register Rtemp ) {
   Register Ralt_count = Rtemp;
   Register Rxfer_bits = Rtemp;
   assert( Ralt_count != Rin_high
       &&  Ralt_count != Rin_low
       &&  Ralt_count != Rcount
       &&  Rxfer_bits != Rin_low
       &&  Rxfer_bits != Rin_high
       &&  Rxfer_bits != Rcount
       &&  Rxfer_bits != Rout_high
       &&  Rout_high  != Rin_low,
         "register alias checks");
   Label big_shift, done;
   // This code can be optimized to use the 64 bit shifts in V9.
   // Here we use the 32 bit shifts.
   and3( Rcount, 0x3f, Rcount);     // take least significant 6 bits
   subcc(Rcount,   31, Ralt_count);
   br(greater, true, pn, big_shift);
   delayed()->dec(Ralt_count);
   // shift < 32 bits, Ralt_count = Rcount-31
   // We get the transfer bits by shifting left by 32-count the high
   // register. This is done by shifting left by 31-count and then by one
   // more to take care of the special (rare) case where count is zero
   // (shifting by 32 would not work).
   neg(Ralt_count);
   if (Rcount != Rout_low) {
     srl(Rin_low, Rcount, Rout_low);
   }
   // The order of the next two instructions is critical in the case where
   // Rin and Rout are the same and should not be reversed.
   sll(Rin_high, Ralt_count, Rxfer_bits); // shift left by 31-count
   srl(Rin_high,     Rcount, Rout_high ); // high half
   sll(Rxfer_bits,        1, Rxfer_bits); // shift left by one more
   if (Rcount == Rout_low) {
     srl(Rin_low, Rcount, Rout_low);
   }
   ba(done);
   delayed()->or3(Rout_low, Rxfer_bits, Rout_low); // new low value: or shifted old low part and xfer from high
   // shift >= 32 bits, Ralt_count = Rcount-32
   bind(big_shift);
   srl(Rin_high, Ralt_count, Rout_low);
   clr(Rout_high);
   bind( done );
 }
 #ifdef _LP64
 void MacroAssembler::lcmp( Register Ra, Register Rb, Register Rresult) {
   cmp(Ra, Rb);
   mov(-1, Rresult);
   movcc(equal,   false, xcc,  0, Rresult);
   movcc(greater, false, xcc,  1, Rresult);
 }
 #endif
 void MacroAssembler::load_sized_value(Address src, Register dst, size_t size_in_bytes, bool is_signed) {
   switch (size_in_bytes) {
   case  8:  ld_long(src, dst); break;
   case  4:  ld(     src, dst); break;
   case  2:  is_signed ? ldsh(src, dst) : lduh(src, dst); break;
   case  1:  is_signed ? ldsb(src, dst) : ldub(src, dst); break;
   default:  ShouldNotReachHere();
   }
 }
 void MacroAssembler::store_sized_value(Register src, Address dst, size_t size_in_bytes) {
   switch (size_in_bytes) {
   case  8:  st_long(src, dst); break;
   case  4:  st(     src, dst); break;
   case  2:  sth(    src, dst); break;
   case  1:  stb(    src, dst); break;
   default:  ShouldNotReachHere();
   }
 }
 void MacroAssembler::float_cmp( bool is_float, int unordered_result,
                                 FloatRegister Fa, FloatRegister Fb,
                                 Register Rresult) {
   fcmp(is_float ? FloatRegisterImpl::S : FloatRegisterImpl::D, fcc0, Fa, Fb);
   Condition lt = unordered_result == -1 ? f_unorderedOrLess    : f_less;
   Condition eq =                          f_equal;
   Condition gt = unordered_result ==  1 ? f_unorderedOrGreater : f_greater;
   if (VM_Version::v9_instructions_work()) {
     mov(-1, Rresult);
     movcc(eq, true, fcc0, 0, Rresult);
     movcc(gt, true, fcc0, 1, Rresult);
   } else {
     Label done;
     set( -1, Rresult );
     //fb(lt, true, pn, done); delayed()->set( -1, Rresult );
     fb( eq, true, pn, done);  delayed()->set(  0, Rresult );
     fb( gt, true, pn, done);  delayed()->set(  1, Rresult );
     bind (done);
   }
 }
 void MacroAssembler::fneg( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
 {
   if (VM_Version::v9_instructions_work()) {
     Assembler::fneg(w, s, d);
   } else {
     if (w == FloatRegisterImpl::S) {
       Assembler::fneg(w, s, d);
     } else if (w == FloatRegisterImpl::D) {
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
         ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
       Assembler::fneg(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
     } else {
       assert(w == FloatRegisterImpl::Q, "Invalid float register width");
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
         ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
       Assembler::fneg(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
     }
   }
 }
 void MacroAssembler::fmov( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
 {
   if (VM_Version::v9_instructions_work()) {
     Assembler::fmov(w, s, d);
   } else {
     if (w == FloatRegisterImpl::S) {
       Assembler::fmov(w, s, d);
     } else if (w == FloatRegisterImpl::D) {
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
         ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
       Assembler::fmov(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
     } else {
       assert(w == FloatRegisterImpl::Q, "Invalid float register width");
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
         ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
       Assembler::fmov(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
     }
   }
 }
 void MacroAssembler::fabs( FloatRegisterImpl::Width w, FloatRegister s, FloatRegister d)
 {
   if (VM_Version::v9_instructions_work()) {
     Assembler::fabs(w, s, d);
   } else {
     if (w == FloatRegisterImpl::S) {
       Assembler::fabs(w, s, d);
     } else if (w == FloatRegisterImpl::D) {
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 1) == 0) &&
         ((d->encoding(FloatRegisterImpl::D) & 1) == 0), "float register alignment check");
       Assembler::fabs(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
     } else {
       assert(w == FloatRegisterImpl::Q, "Invalid float register width");
       // number() does a sanity check on the alignment.
       assert(((s->encoding(FloatRegisterImpl::D) & 3) == 0) &&
        ((d->encoding(FloatRegisterImpl::D) & 3) == 0), "float register alignment check");
       Assembler::fabs(FloatRegisterImpl::S, s, d);
       Assembler::fmov(FloatRegisterImpl::S, s->successor(), d->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor(), d->successor()->successor());
       Assembler::fmov(FloatRegisterImpl::S, s->successor()->successor()->successor(), d->successor()->successor()->successor());
     }
   }
 }
 void MacroAssembler::save_all_globals_into_locals() {
   mov(G1,L1);
   mov(G2,L2);
   mov(G3,L3);
   mov(G4,L4);
   mov(G5,L5);
   mov(G6,L6);
   mov(G7,L7);
 }
 void MacroAssembler::restore_globals_from_locals() {
   mov(L1,G1);
   mov(L2,G2);
   mov(L3,G3);
   mov(L4,G4);
   mov(L5,G5);
   mov(L6,G6);
   mov(L7,G7);
 }
 // Use for 64 bit operation.
 void MacroAssembler::casx_under_lock(Register top_ptr_reg, Register top_reg, Register ptr_reg, address lock_addr, bool use_call_vm)
 {
   // store ptr_reg as the new top value
 #ifdef _LP64
   casx(top_ptr_reg, top_reg, ptr_reg);
 #else
   cas_under_lock(top_ptr_reg, top_reg, ptr_reg, lock_addr, use_call_vm);
 #endif // _LP64
 }
 // [RGV] This routine does not handle 64 bit operations.
 //       use casx_under_lock() or casx directly!!!
 void MacroAssembler::cas_under_lock(Register top_ptr_reg, Register top_reg, Register ptr_reg, address lock_addr, bool use_call_vm)
 {
   // store ptr_reg as the new top value
   if (VM_Version::v9_instructions_work()) {
     cas(top_ptr_reg, top_reg, ptr_reg);
   } else {
     // If the register is not an out nor global, it is not visible
     // after the save.  Allocate a register for it, save its
     // value in the register save area (the save may not flush
     // registers to the save area).
     Register top_ptr_reg_after_save;
     Register top_reg_after_save;
     Register ptr_reg_after_save;
     if (top_ptr_reg->is_out() || top_ptr_reg->is_global()) {
       top_ptr_reg_after_save = top_ptr_reg->after_save();
     } else {
       Address reg_save_addr = top_ptr_reg->address_in_saved_window();
       top_ptr_reg_after_save = L0;
       st(top_ptr_reg, reg_save_addr);
     }
     if (top_reg->is_out() || top_reg->is_global()) {
       top_reg_after_save = top_reg->after_save();
     } else {
       Address reg_save_addr = top_reg->address_in_saved_window();
       top_reg_after_save = L1;
       st(top_reg, reg_save_addr);
     }
     if (ptr_reg->is_out() || ptr_reg->is_global()) {
       ptr_reg_after_save = ptr_reg->after_save();
     } else {
       Address reg_save_addr = ptr_reg->address_in_saved_window();
       ptr_reg_after_save = L2;
       st(ptr_reg, reg_save_addr);
     }
     const Register& lock_reg = L3;
     const Register& lock_ptr_reg = L4;
     const Register& value_reg = L5;
     const Register& yield_reg = L6;
     const Register& yieldall_reg = L7;
     save_frame();
     if (top_ptr_reg_after_save == L0) {
       ld(top_ptr_reg->address_in_saved_window().after_save(), top_ptr_reg_after_save);
     }
     if (top_reg_after_save == L1) {
       ld(top_reg->address_in_saved_window().after_save(), top_reg_after_save);
     }
     if (ptr_reg_after_save == L2) {
       ld(ptr_reg->address_in_saved_window().after_save(), ptr_reg_after_save);
     }
     Label(retry_get_lock);
     Label(not_same);
     Label(dont_yield);
     assert(lock_addr, "lock_address should be non null for v8");
     set((intptr_t)lock_addr, lock_ptr_reg);
     // Initialize yield counter
     mov(G0,yield_reg);
     mov(G0, yieldall_reg);
     set(StubRoutines::Sparc::locked, lock_reg);
     bind(retry_get_lock);
     cmp_and_br_short(yield_reg, V8AtomicOperationUnderLockSpinCount, Assembler::less, Assembler::pt, dont_yield);
     if(use_call_vm) {
       Untested("Need to verify global reg consistancy");
       call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::yield_all), yieldall_reg);
     } else {
       // Save the regs and make space for a C call
       save(SP, -96, SP);
       save_all_globals_into_locals();
       call(CAST_FROM_FN_PTR(address,os::yield_all));
       delayed()->mov(yieldall_reg, O0);
       restore_globals_from_locals();
       restore();
     }
     // reset the counter
     mov(G0,yield_reg);
     add(yieldall_reg, 1, yieldall_reg);
     bind(dont_yield);
     // try to get lock
     Assembler::swap(lock_ptr_reg, 0, lock_reg);
     // did we get the lock?
     cmp(lock_reg, StubRoutines::Sparc::unlocked);
     br(Assembler::notEqual, true, Assembler::pn, retry_get_lock);
     delayed()->add(yield_reg,1,yield_reg);
     // yes, got lock.  do we have the same top?
     ld(top_ptr_reg_after_save, 0, value_reg);
     cmp_and_br_short(value_reg, top_reg_after_save, Assembler::notEqual, Assembler::pn, not_same);
     // yes, same top.
     st(ptr_reg_after_save, top_ptr_reg_after_save, 0);
     membar(Assembler::StoreStore);
     bind(not_same);
     mov(value_reg, ptr_reg_after_save);
     st(lock_reg, lock_ptr_reg, 0); // unlock
     restore();
   }
 }
 RegisterOrConstant MacroAssembler::delayed_value_impl(intptr_t* delayed_value_addr,
                                                       Register tmp,
                                                       int offset) {
   intptr_t value = *delayed_value_addr;
   if (value != 0)
     return RegisterOrConstant(value + offset);
   // load indirectly to solve generation ordering problem
   AddressLiteral a(delayed_value_addr);
   load_ptr_contents(a, tmp);
 #ifdef ASSERT
   tst(tmp);
   breakpoint_trap(zero, xcc);
 #endif
   if (offset != 0)
     add(tmp, offset, tmp);
   return RegisterOrConstant(tmp);
 }
 RegisterOrConstant MacroAssembler::regcon_andn_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
   assert(d.register_or_noreg() != G0, "lost side effect");
   if ((s2.is_constant() && s2.as_constant() == 0) ||
       (s2.is_register() && s2.as_register() == G0)) {
     // Do nothing, just move value.
     if (s1.is_register()) {
       if (d.is_constant())  d = temp;
       mov(s1.as_register(), d.as_register());
       return d;
     } else {
       return s1;
     }
   }
   if (s1.is_register()) {
     assert_different_registers(s1.as_register(), temp);
     if (d.is_constant())  d = temp;
     andn(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
     return d;
   } else {
     if (s2.is_register()) {
       assert_different_registers(s2.as_register(), temp);
       if (d.is_constant())  d = temp;
       set(s1.as_constant(), temp);
       andn(temp, s2.as_register(), d.as_register());
       return d;
     } else {
       intptr_t res = s1.as_constant() & ~s2.as_constant();
       return res;
     }
   }
 }
 RegisterOrConstant MacroAssembler::regcon_inc_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
   assert(d.register_or_noreg() != G0, "lost side effect");
   if ((s2.is_constant() && s2.as_constant() == 0) ||
       (s2.is_register() && s2.as_register() == G0)) {
     // Do nothing, just move value.
     if (s1.is_register()) {
       if (d.is_constant())  d = temp;
       mov(s1.as_register(), d.as_register());
       return d;
     } else {
       return s1;
     }
   }
   if (s1.is_register()) {
     assert_different_registers(s1.as_register(), temp);
     if (d.is_constant())  d = temp;
     add(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
     return d;
   } else {
     if (s2.is_register()) {
       assert_different_registers(s2.as_register(), temp);
       if (d.is_constant())  d = temp;
       add(s2.as_register(), ensure_simm13_or_reg(s1, temp), d.as_register());
       return d;
     } else {
       intptr_t res = s1.as_constant() + s2.as_constant();
       return res;
     }
   }
 }
 RegisterOrConstant MacroAssembler::regcon_sll_ptr(RegisterOrConstant s1, RegisterOrConstant s2, RegisterOrConstant d, Register temp) {
   assert(d.register_or_noreg() != G0, "lost side effect");
   if (!is_simm13(s2.constant_or_zero()))
     s2 = (s2.as_constant() & 0xFF);
   if ((s2.is_constant() && s2.as_constant() == 0) ||
       (s2.is_register() && s2.as_register() == G0)) {
     // Do nothing, just move value.
     if (s1.is_register()) {
       if (d.is_constant())  d = temp;
       mov(s1.as_register(), d.as_register());
       return d;
     } else {
       return s1;
     }
   }
   if (s1.is_register()) {
     assert_different_registers(s1.as_register(), temp);
     if (d.is_constant())  d = temp;
     sll_ptr(s1.as_register(), ensure_simm13_or_reg(s2, temp), d.as_register());
     return d;
   } else {
     if (s2.is_register()) {
       assert_different_registers(s2.as_register(), temp);
       if (d.is_constant())  d = temp;
       set(s1.as_constant(), temp);
       sll_ptr(temp, s2.as_register(), d.as_register());
       return d;
     } else {
       intptr_t res = s1.as_constant() << s2.as_constant();
       return res;
     }
   }
 }
 // Look up the method for a megamorphic invokeinterface call.
 // The target method is determined by <intf_klass, itable_index>.
 // The receiver klass is in recv_klass.
 // On success, the result will be in method_result, and execution falls through.
 // On failure, execution transfers to the given label.
 void MacroAssembler::lookup_interface_method(Register recv_klass,
                                              Register intf_klass,
                                              RegisterOrConstant itable_index,
                                              Register method_result,
                                              Register scan_temp,
                                              Register sethi_temp,
                                              Label& L_no_such_interface) {
   assert_different_registers(recv_klass, intf_klass, method_result, scan_temp);
   assert(itable_index.is_constant() || itable_index.as_register() == method_result,
          "caller must use same register for non-constant itable index as for method");
   Label L_no_such_interface_restore;
   bool did_save = false;
   if (scan_temp == noreg || sethi_temp == noreg) {
     Register recv_2 = recv_klass->is_global() ? recv_klass : L0;
     Register intf_2 = intf_klass->is_global() ? intf_klass : L1;
     assert(method_result->is_global(), "must be able to return value");
     scan_temp  = L2;
     sethi_temp = L3;
     save_frame_and_mov(0, recv_klass, recv_2, intf_klass, intf_2);
     recv_klass = recv_2;
     intf_klass = intf_2;
     did_save = true;
   }
   // Compute start of first itableOffsetEntry (which is at the end of the vtable)
   int vtable_base = InstanceKlass::vtable_start_offset() * wordSize;
   int scan_step   = itableOffsetEntry::size() * wordSize;
   int vte_size    = vtableEntry::size() * wordSize;
   lduw(recv_klass, InstanceKlass::vtable_length_offset() * wordSize, scan_temp);
   // %%% We should store the aligned, prescaled offset in the klassoop.
   // Then the next several instructions would fold away.
   int round_to_unit = ((HeapWordsPerLong > 1) ? BytesPerLong : 0);
   int itb_offset = vtable_base;
   if (round_to_unit != 0) {
     // hoist first instruction of round_to(scan_temp, BytesPerLong):
     itb_offset += round_to_unit - wordSize;
   }
   int itb_scale = exact_log2(vtableEntry::size() * wordSize);
   sll(scan_temp, itb_scale,  scan_temp);
   add(scan_temp, itb_offset, scan_temp);
   if (round_to_unit != 0) {
     // Round up to align_object_offset boundary
     // see code for InstanceKlass::start_of_itable!
     // Was: round_to(scan_temp, BytesPerLong);
     // Hoisted: add(scan_temp, BytesPerLong-1, scan_temp);
     and3(scan_temp, -round_to_unit, scan_temp);
   }
   add(recv_klass, scan_temp, scan_temp);
   // Adjust recv_klass by scaled itable_index, so we can free itable_index.
   RegisterOrConstant itable_offset = itable_index;
   itable_offset = regcon_sll_ptr(itable_index, exact_log2(itableMethodEntry::size() * wordSize), itable_offset);
   itable_offset = regcon_inc_ptr(itable_offset, itableMethodEntry::method_offset_in_bytes(), itable_offset);
   add(recv_klass, ensure_simm13_or_reg(itable_offset, sethi_temp), recv_klass);
   // for (scan = klass->itable(); scan->interface() != NULL; scan += scan_step) {
   //   if (scan->interface() == intf) {
   //     result = (klass + scan->offset() + itable_index);
   //   }
   // }
   Label L_search, L_found_method;
   for (int peel = 1; peel >= 0; peel--) {
     // %%%% Could load both offset and interface in one ldx, if they were
     // in the opposite order.  This would save a load.
     ld_ptr(scan_temp, itableOffsetEntry::interface_offset_in_bytes(), method_result);
     // Check that this entry is non-null.  A null entry means that
     // the receiver class doesn't implement the interface, and wasn't the
     // same as when the caller was compiled.
     bpr(Assembler::rc_z, false, Assembler::pn, method_result, did_save ? L_no_such_interface_restore : L_no_such_interface);
     delayed()->cmp(method_result, intf_klass);
     if (peel) {
       brx(Assembler::equal,    false, Assembler::pt, L_found_method);
     } else {
       brx(Assembler::notEqual, false, Assembler::pn, L_search);
       // (invert the test to fall through to found_method...)
     }
     delayed()->add(scan_temp, scan_step, scan_temp);
     if (!peel)  break;
     bind(L_search);
   }
   bind(L_found_method);
   // Got a hit.
   int ito_offset = itableOffsetEntry::offset_offset_in_bytes();
   // scan_temp[-scan_step] points to the vtable offset we need
   ito_offset -= scan_step;
   lduw(scan_temp, ito_offset, scan_temp);
   ld_ptr(recv_klass, scan_temp, method_result);
   if (did_save) {
     Label L_done;
     ba(L_done);
     delayed()->restore();
     bind(L_no_such_interface_restore);
     ba(L_no_such_interface);
     delayed()->restore();
     bind(L_done);
   }
 }
 // virtual method calling
 void MacroAssembler::lookup_virtual_method(Register recv_klass,
                                            RegisterOrConstant vtable_index,
                                            Register method_result) {
   assert_different_registers(recv_klass, method_result, vtable_index.register_or_noreg());
   Register sethi_temp = method_result;
   const int base = (InstanceKlass::vtable_start_offset() * wordSize +
                     // method pointer offset within the vtable entry:
                     vtableEntry::method_offset_in_bytes());
   RegisterOrConstant vtable_offset = vtable_index;
   // Each of the following three lines potentially generates an instruction.
   // But the total number of address formation instructions will always be
   // at most two, and will often be zero.  In any case, it will be optimal.
   // If vtable_index is a register, we will have (sll_ptr N,x; inc_ptr B,x; ld_ptr k,x).
   // If vtable_index is a constant, we will have at most (set B+X<<N,t; ld_ptr k,t).
   vtable_offset = regcon_sll_ptr(vtable_index, exact_log2(vtableEntry::size() * wordSize), vtable_offset);
   vtable_offset = regcon_inc_ptr(vtable_offset, base, vtable_offset, sethi_temp);
   Address vtable_entry_addr(recv_klass, ensure_simm13_or_reg(vtable_offset, sethi_temp));
   ld_ptr(vtable_entry_addr, method_result);
 }
 void MacroAssembler::check_klass_subtype(Register sub_klass,
                                          Register super_klass,
                                          Register temp_reg,
                                          Register temp2_reg,
                                          Label& L_success) {
   Register sub_2 = sub_klass;
   Register sup_2 = super_klass;
   if (!sub_2->is_global())  sub_2 = L0;
   if (!sup_2->is_global())  sup_2 = L1;
   bool did_save = false;
   if (temp_reg == noreg || temp2_reg == noreg) {
     temp_reg = L2;
     temp2_reg = L3;
     save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
     sub_klass = sub_2;
     super_klass = sup_2;
     did_save = true;
   }
   Label L_failure, L_pop_to_failure, L_pop_to_success;
   check_klass_subtype_fast_path(sub_klass, super_klass,
                                 temp_reg, temp2_reg,
                                 (did_save ? &L_pop_to_success : &L_success),
                                 (did_save ? &L_pop_to_failure : &L_failure), NULL);
   if (!did_save)
     save_frame_and_mov(0, sub_klass, sub_2, super_klass, sup_2);
   check_klass_subtype_slow_path(sub_2, sup_2,
                                 L2, L3, L4, L5,
                                 NULL, &L_pop_to_failure);
   // on success:
   bind(L_pop_to_success);
   restore();
   ba_short(L_success);
   // on failure:
   bind(L_pop_to_failure);
   restore();
   bind(L_failure);
 }
 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
                                                    Register super_klass,
                                                    Register temp_reg,
                                                    Register temp2_reg,
                                                    Label* L_success,
                                                    Label* L_failure,
                                                    Label* L_slow_path,
                                         RegisterOrConstant super_check_offset) {
   int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
   int sco_offset = in_bytes(Klass::super_check_offset_offset());
   bool must_load_sco  = (super_check_offset.constant_or_zero() == -1);
   bool need_slow_path = (must_load_sco ||
                          super_check_offset.constant_or_zero() == sco_offset);
   assert_different_registers(sub_klass, super_klass, temp_reg);
   if (super_check_offset.is_register()) {
     assert_different_registers(sub_klass, super_klass, temp_reg,
                                super_check_offset.as_register());
   } else if (must_load_sco) {
     assert(temp2_reg != noreg, "supply either a temp or a register offset");
   }
   Label L_fallthrough;
   int label_nulls = 0;
   if (L_success == NULL)   { L_success   = &L_fallthrough; label_nulls++; }
   if (L_failure == NULL)   { L_failure   = &L_fallthrough; label_nulls++; }
   if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; }
   assert(label_nulls <= 1 ||
          (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path),
          "at most one NULL in the batch, usually");
   // If the pointers are equal, we are done (e.g., String[] elements).
   // This self-check enables sharing of secondary supertype arrays among
   // non-primary types such as array-of-interface.  Otherwise, each such
   // type would need its own customized SSA.
   // We move this check to the front of the fast path because many
   // type checks are in fact trivially successful in this manner,
   // so we get a nicely predicted branch right at the start of the check.
   cmp(super_klass, sub_klass);
   brx(Assembler::equal, false, Assembler::pn, *L_success);
   delayed()->nop();
   // Check the supertype display:
   if (must_load_sco) {
     // The super check offset is always positive...
     lduw(super_klass, sco_offset, temp2_reg);
     super_check_offset = RegisterOrConstant(temp2_reg);
     // super_check_offset is register.
     assert_different_registers(sub_klass, super_klass, temp_reg, super_check_offset.as_register());
   }
   ld_ptr(sub_klass, super_check_offset, temp_reg);
   cmp(super_klass, temp_reg);
   // This check has worked decisively for primary supers.
   // Secondary supers are sought in the super_cache ('super_cache_addr').
   // (Secondary supers are interfaces and very deeply nested subtypes.)
   // This works in the same check above because of a tricky aliasing
   // between the super_cache and the primary super display elements.
   // (The 'super_check_addr' can address either, as the case requires.)
   // Note that the cache is updated below if it does not help us find
   // what we need immediately.
   // So if it was a primary super, we can just fail immediately.
   // Otherwise, it's the slow path for us (no success at this point).
   // Hacked ba(), which may only be used just before L_fallthrough.
 #define FINAL_JUMP(label)            \
   if (&(label) != &L_fallthrough) {  \
     ba(label);  delayed()->nop();    \
   }
   if (super_check_offset.is_register()) {
     brx(Assembler::equal, false, Assembler::pn, *L_success);
     delayed()->cmp(super_check_offset.as_register(), sc_offset);
     if (L_failure == &L_fallthrough) {
       brx(Assembler::equal, false, Assembler::pt, *L_slow_path);
       delayed()->nop();
     } else {
       brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
       delayed()->nop();
       FINAL_JUMP(*L_slow_path);
     }
   } else if (super_check_offset.as_constant() == sc_offset) {
     // Need a slow path; fast failure is impossible.
     if (L_slow_path == &L_fallthrough) {
       brx(Assembler::equal, false, Assembler::pt, *L_success);
       delayed()->nop();
     } else {
       brx(Assembler::notEqual, false, Assembler::pn, *L_slow_path);
       delayed()->nop();
       FINAL_JUMP(*L_success);
     }
   } else {
     // No slow path; it's a fast decision.
     if (L_failure == &L_fallthrough) {
       brx(Assembler::equal, false, Assembler::pt, *L_success);
       delayed()->nop();
     } else {
       brx(Assembler::notEqual, false, Assembler::pn, *L_failure);
       delayed()->nop();
       FINAL_JUMP(*L_success);
     }
   }
   bind(L_fallthrough);
 #undef FINAL_JUMP
 }
 void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
                                                    Register super_klass,
                                                    Register count_temp,
                                                    Register scan_temp,
                                                    Register scratch_reg,
                                                    Register coop_reg,
                                                    Label* L_success,
                                                    Label* L_failure) {
   assert_different_registers(sub_klass, super_klass,
                              count_temp, scan_temp, scratch_reg, coop_reg);
   Label L_fallthrough, L_loop;
   int label_nulls = 0;
   if (L_success == NULL)   { L_success   = &L_fallthrough; label_nulls++; }
   if (L_failure == NULL)   { L_failure   = &L_fallthrough; label_nulls++; }
   assert(label_nulls <= 1, "at most one NULL in the batch");
   // a couple of useful fields in sub_klass:
   int ss_offset = in_bytes(Klass::secondary_supers_offset());
   int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
   // Do a linear scan of the secondary super-klass chain.
   // This code is rarely used, so simplicity is a virtue here.
 #ifndef PRODUCT
   int* pst_counter = &SharedRuntime::_partial_subtype_ctr;
   inc_counter((address) pst_counter, count_temp, scan_temp);
 #endif
   // We will consult the secondary-super array.
   ld_ptr(sub_klass, ss_offset, scan_temp);
   Register search_key = super_klass;
   // Load the array length.  (Positive movl does right thing on LP64.)
   lduw(scan_temp, Array<Klass*>::length_offset_in_bytes(), count_temp);
   // Check for empty secondary super list
   tst(count_temp);
   // In the array of super classes elements are pointer sized.
   int element_size = wordSize;
   // Top of search loop
   bind(L_loop);
   br(Assembler::equal, false, Assembler::pn, *L_failure);
   delayed()->add(scan_temp, element_size, scan_temp);
   // Skip the array header in all array accesses.
   int elem_offset = Array<Klass*>::base_offset_in_bytes();
   elem_offset -= element_size;   // the scan pointer was pre-incremented also
   // Load next super to check
     ld_ptr( scan_temp, elem_offset, scratch_reg );
   // Look for Rsuper_klass on Rsub_klass's secondary super-class-overflow list
   cmp(scratch_reg, search_key);
   // A miss means we are NOT a subtype and need to keep looping
   brx(Assembler::notEqual, false, Assembler::pn, L_loop);
   delayed()->deccc(count_temp); // decrement trip counter in delay slot
   // Success.  Cache the super we found and proceed in triumph.
   st_ptr(super_klass, sub_klass, sc_offset);
   if (L_success != &L_fallthrough) {
     ba(*L_success);
     delayed()->nop();
   }
   bind(L_fallthrough);
 }
 RegisterOrConstant MacroAssembler::argument_offset(RegisterOrConstant arg_slot,
                                                    Register temp_reg,
                                                    int extra_slot_offset) {
   // cf. TemplateTable::prepare_invoke(), if (load_receiver).
   int stackElementSize = Interpreter::stackElementSize;
   int offset = extra_slot_offset * stackElementSize;
   if (arg_slot.is_constant()) {
     offset += arg_slot.as_constant() * stackElementSize;
     return offset;
   } else {
     assert(temp_reg != noreg, "must specify");
     sll_ptr(arg_slot.as_register(), exact_log2(stackElementSize), temp_reg);
     if (offset != 0)
       add(temp_reg, offset, temp_reg);
     return temp_reg;
   }
 }
 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
                                          Register temp_reg,
                                          int extra_slot_offset) {
   return Address(Gargs, argument_offset(arg_slot, temp_reg, extra_slot_offset));
 }
 void MacroAssembler::biased_locking_enter(Register obj_reg, Register mark_reg,
                                           Register temp_reg,
                                           Label& done, Label* slow_case,
                                           BiasedLockingCounters* counters) {
   assert(UseBiasedLocking, "why call this otherwise?");
   if (PrintBiasedLockingStatistics) {
     assert_different_registers(obj_reg, mark_reg, temp_reg, O7);
     if (counters == NULL)
       counters = BiasedLocking::counters();
   }
   Label cas_label;
   // Biased locking
   // See whether the lock is currently biased toward our thread and
   // whether the epoch is still valid
   // Note that the runtime guarantees sufficient alignment of JavaThread
   // pointers to allow age to be placed into low bits
   assert(markOopDesc::age_shift == markOopDesc::lock_bits + markOopDesc::biased_lock_bits, "biased locking makes assumptions about bit layout");
   and3(mark_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
   cmp_and_brx_short(temp_reg, markOopDesc::biased_lock_pattern, Assembler::notEqual, Assembler::pn, cas_label);
   load_klass(obj_reg, temp_reg);
   ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
   or3(G2_thread, temp_reg, temp_reg);
   xor3(mark_reg, temp_reg, temp_reg);
   andcc(temp_reg, ~((int) markOopDesc::age_mask_in_place), temp_reg);
   if (counters != NULL) {
     cond_inc(Assembler::equal, (address) counters->biased_lock_entry_count_addr(), mark_reg, temp_reg);
     // Reload mark_reg as we may need it later
     ld_ptr(Address(obj_reg, oopDesc::mark_offset_in_bytes()), mark_reg);
   }
   brx(Assembler::equal, true, Assembler::pt, done);
   delayed()->nop();
   Label try_revoke_bias;
   Label try_rebias;
   Address mark_addr = Address(obj_reg, oopDesc::mark_offset_in_bytes());
   assert(mark_addr.disp() == 0, "cas must take a zero displacement");
   // At this point we know that the header has the bias pattern and
   // that we are not the bias owner in the current epoch. We need to
   // figure out more details about the state of the header in order to
   // know what operations can be legally performed on the object's
   // header.
   // If the low three bits in the xor result aren't clear, that means
   // the prototype header is no longer biased and we have to revoke
   // the bias on this object.
   btst(markOopDesc::biased_lock_mask_in_place, temp_reg);
   brx(Assembler::notZero, false, Assembler::pn, try_revoke_bias);
   // Biasing is still enabled for this data type. See whether the
   // epoch of the current bias is still valid, meaning that the epoch
   // bits of the mark word are equal to the epoch bits of the
   // prototype header. (Note that the prototype header's epoch bits
   // only change at a safepoint.) If not, attempt to rebias the object
   // toward the current thread. Note that we must be absolutely sure
   // that the current epoch is invalid in order to do this because
   // otherwise the manipulations it performs on the mark word are
   // illegal.
   delayed()->btst(markOopDesc::epoch_mask_in_place, temp_reg);
   brx(Assembler::notZero, false, Assembler::pn, try_rebias);
   // The epoch of the current bias is still valid but we know nothing
   // about the owner; it might be set or it might be clear. Try to
   // acquire the bias of the object using an atomic operation. If this
   // fails we will go in to the runtime to revoke the object's bias.
   // Note that we first construct the presumed unbiased header so we
   // don't accidentally blow away another thread's valid bias.
   delayed()->and3(mark_reg,
                   markOopDesc::biased_lock_mask_in_place | markOopDesc::age_mask_in_place | markOopDesc::epoch_mask_in_place,
                   mark_reg);
   or3(G2_thread, mark_reg, temp_reg);
   casn(mark_addr.base(), mark_reg, temp_reg);
   // If the biasing toward our thread failed, this means that
   // another thread succeeded in biasing it toward itself and we
   // need to revoke that bias. The revocation will occur in the
   // interpreter runtime in the slow case.
   cmp(mark_reg, temp_reg);
   if (counters != NULL) {
     cond_inc(Assembler::zero, (address) counters->anonymously_biased_lock_entry_count_addr(), mark_reg, temp_reg);
   }
   if (slow_case != NULL) {
     brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
     delayed()->nop();
   }
   ba_short(done);
   bind(try_rebias);
   // At this point we know the epoch has expired, meaning that the
   // current "bias owner", if any, is actually invalid. Under these
   // circumstances _only_, we are allowed to use the current header's
   // value as the comparison value when doing the cas to acquire the
   // bias in the current epoch. In other words, we allow transfer of
   // the bias from one thread to another directly in this situation.
   //
   // FIXME: due to a lack of registers we currently blow away the age
   // bits in this situation. Should attempt to preserve them.
   load_klass(obj_reg, temp_reg);
   ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
   or3(G2_thread, temp_reg, temp_reg);
   casn(mark_addr.base(), mark_reg, temp_reg);
   // If the biasing toward our thread failed, this means that
   // another thread succeeded in biasing it toward itself and we
   // need to revoke that bias. The revocation will occur in the
   // interpreter runtime in the slow case.
   cmp(mark_reg, temp_reg);
   if (counters != NULL) {
     cond_inc(Assembler::zero, (address) counters->rebiased_lock_entry_count_addr(), mark_reg, temp_reg);
   }
   if (slow_case != NULL) {
     brx(Assembler::notEqual, true, Assembler::pn, *slow_case);
     delayed()->nop();
   }
   ba_short(done);
   bind(try_revoke_bias);
   // The prototype mark in the klass doesn't have the bias bit set any
   // more, indicating that objects of this data type are not supposed
   // to be biased any more. We are going to try to reset the mark of
   // this object to the prototype value and fall through to the
   // CAS-based locking scheme. Note that if our CAS fails, it means
   // that another thread raced us for the privilege of revoking the
   // bias of this particular object, so it's okay to continue in the
   // normal locking code.
   //
   // FIXME: due to a lack of registers we currently blow away the age
   // bits in this situation. Should attempt to preserve them.
   load_klass(obj_reg, temp_reg);
   ld_ptr(Address(temp_reg, Klass::prototype_header_offset()), temp_reg);
   casn(mark_addr.base(), mark_reg, temp_reg);
   // Fall through to the normal CAS-based lock, because no matter what
   // the result of the above CAS, some thread must have succeeded in
   // removing the bias bit from the object's header.
   if (counters != NULL) {
     cmp(mark_reg, temp_reg);
     cond_inc(Assembler::zero, (address) counters->revoked_lock_entry_count_addr(), mark_reg, temp_reg);
   }
   bind(cas_label);
 }
 void MacroAssembler::biased_locking_exit (Address mark_addr, Register temp_reg, Label& done,
                                           bool allow_delay_slot_filling) {
   // Check for biased locking unlock case, which is a no-op
   // Note: we do not have to check the thread ID for two reasons.
   // First, the interpreter checks for IllegalMonitorStateException at
   // a higher level. Second, if the bias was revoked while we held the
   // lock, the object could not be rebiased toward another thread, so
   // the bias bit would be clear.
   ld_ptr(mark_addr, temp_reg);
   and3(temp_reg, markOopDesc::biased_lock_mask_in_place, temp_reg);
   cmp(temp_reg, markOopDesc::biased_lock_pattern);
   brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
   delayed();
   if (!allow_delay_slot_filling) {
     nop();
   }
 }
 // CASN -- 32-64 bit switch hitter similar to the synthetic CASN provided by
 // Solaris/SPARC's "as".  Another apt name would be cas_ptr()
 void MacroAssembler::casn (Register addr_reg, Register cmp_reg, Register set_reg ) {
   casx_under_lock (addr_reg, cmp_reg, set_reg, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
 }
 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
 // of i486.ad fast_lock() and fast_unlock().  See those methods for detailed comments.
 // The code could be tightened up considerably.
 //
 // box->dhw disposition - post-conditions at DONE_LABEL.
 // -   Successful inflated lock:  box->dhw != 0.
 //     Any non-zero value suffices.
 //     Consider G2_thread, rsp, boxReg, or unused_mark()
 // -   Successful Stack-lock: box->dhw == mark.
 //     box->dhw must contain the displaced mark word value
 // -   Failure -- icc.ZFlag == 0 and box->dhw is undefined.
 //     The slow-path fast_enter() and slow_enter() operators
 //     are responsible for setting box->dhw = NonZero (typically ::unused_mark).
 // -   Biased: box->dhw is undefined
 //
 // SPARC refworkload performance - specifically jetstream and scimark - are
 // extremely sensitive to the size of the code emitted by compiler_lock_object
 // and compiler_unlock_object.  Critically, the key factor is code size, not path
 // length.  (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
 // effect).
 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
                                           Register Rbox, Register Rscratch,
                                           BiasedLockingCounters* counters,
                                           bool try_bias) {
    Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
    verify_oop(Roop);
    Label done ;
    if (counters != NULL) {
      inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
    }
    if (EmitSync & 1) {
      mov(3, Rscratch);
      st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
      cmp(SP, G0);
      return ;
    }
    if (EmitSync & 2) {
      // Fetch object's markword
      ld_ptr(mark_addr, Rmark);
      if (try_bias) {
         biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
      }
      // Save Rbox in Rscratch to be used for the cas operation
      mov(Rbox, Rscratch);
      // set Rmark to markOop | markOopDesc::unlocked_value
      or3(Rmark, markOopDesc::unlocked_value, Rmark);
      // Initialize the box.  (Must happen before we update the object mark!)
      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);
 #ifdef _LP64
      sub(Rscratch, STACK_BIAS, Rscratch);
 #endif
      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);
      st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
      bind (done);
      return ;
    }
    Label Egress ;
    if (EmitSync & 256) {
       Label IsInflated ;
       ld_ptr(mark_addr, Rmark);           // fetch obj->mark
       // Triage: biased, stack-locked, neutral, inflated
       if (try_bias) {
         biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
         // Invariant: if control reaches this point in the emitted stream
         // then Rmark has not been modified.
       }
       // Store mark into displaced mark field in the on-stack basic-lock "box"
       // Critically, this must happen before the CAS
       // Maximize the ST-CAS distance to minimize the ST-before-CAS penalty.
       st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
       andcc(Rmark, 2, G0);
       brx(Assembler::notZero, false, Assembler::pn, IsInflated);
       delayed()->
       // Try stack-lock acquisition.
       // Beware: the 1st instruction is in a delay slot
       mov(Rbox,  Rscratch);
       or3(Rmark, markOopDesc::unlocked_value, Rmark);
       assert(mark_addr.disp() == 0, "cas must take a zero displacement");
       casn(mark_addr.base(), Rmark, Rscratch);
       cmp(Rmark, Rscratch);
       brx(Assembler::equal, false, Assembler::pt, done);
       delayed()->sub(Rscratch, SP, Rscratch);
       // Stack-lock attempt failed - check for recursive stack-lock.
       // See the comments below about how we might remove this case.
 #ifdef _LP64
       sub(Rscratch, STACK_BIAS, Rscratch);
 #endif
       assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
       andcc(Rscratch, 0xfffff003, Rscratch);
       br(Assembler::always, false, Assembler::pt, done);
       delayed()-> st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
       bind(IsInflated);
       if (EmitSync & 64) {
          // If m->owner != null goto IsLocked
          // Pessimistic form: Test-and-CAS vs CAS
          // The optimistic form avoids RTS->RTO cache line upgrades.
          ld_ptr(Rmark, ObjectMonitor::owner_offset_in_bytes() - 2, Rscratch);
          andcc(Rscratch, Rscratch, G0);
          brx(Assembler::notZero, false, Assembler::pn, done);
          delayed()->nop();
          // m->owner == null : it's unlocked.
       }
       // Try to CAS m->owner from null to Self
       // Invariant: if we acquire the lock then _recursions should be 0.
       add(Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark);
       mov(G2_thread, Rscratch);
       casn(Rmark, G0, Rscratch);
       cmp(Rscratch, G0);
       // Intentional fall-through into done
    } else {
       // Aggressively avoid the Store-before-CAS penalty
       // Defer the store into box->dhw until after the CAS
       Label IsInflated, Recursive ;
 // Anticipate CAS -- Avoid RTS->RTO upgrade
 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
       ld_ptr(mark_addr, Rmark);           // fetch obj->mark
       // Triage: biased, stack-locked, neutral, inflated
       if (try_bias) {
         biased_locking_enter(Roop, Rmark, Rscratch, done, NULL, counters);
         // Invariant: if control reaches this point in the emitted stream
         // then Rmark has not been modified.
       }
       andcc(Rmark, 2, G0);
       brx(Assembler::notZero, false, Assembler::pn, IsInflated);
       delayed()->                         // Beware - dangling delay-slot
       // Try stack-lock acquisition.
       // Transiently install BUSY (0) encoding in the mark word.
       // if the CAS of 0 into the mark was successful then we execute:
       //   ST box->dhw  = mark   -- save fetched mark in on-stack basiclock box
       //   ST obj->mark = box    -- overwrite transient 0 value
       // This presumes TSO, of course.
       mov(0, Rscratch);
       or3(Rmark, markOopDesc::unlocked_value, Rmark);
       assert(mark_addr.disp() == 0, "cas must take a zero displacement");
       casn(mark_addr.base(), Rmark, Rscratch);
 // prefetch (mark_addr, Assembler::severalWritesAndPossiblyReads);
       cmp(Rscratch, Rmark);
       brx(Assembler::notZero, false, Assembler::pn, Recursive);
       delayed()->st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
       if (counters != NULL) {
         cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
       }
       ba(done);
       delayed()->st_ptr(Rbox, mark_addr);
       bind(Recursive);
       // Stack-lock attempt failed - check for recursive stack-lock.
       // Tests show that we can remove the recursive case with no impact
       // on refworkload 0.83.  If we need to reduce the size of the code
       // emitted by compiler_lock_object() the recursive case is perfect
       // candidate.
       //
       // A more extreme idea is to always inflate on stack-lock recursion.
       // This lets us eliminate the recursive checks in compiler_lock_object
       // and compiler_unlock_object and the (box->dhw == 0) encoding.
       // A brief experiment - requiring changes to synchronizer.cpp, interpreter,
       // and showed a performance *increase*.  In the same experiment I eliminated
       // the fast-path stack-lock code from the interpreter and always passed
       // control to the "slow" operators in synchronizer.cpp.
       // RScratch contains the fetched obj->mark value from the failed CASN.
 #ifdef _LP64
       sub(Rscratch, STACK_BIAS, Rscratch);
 #endif
       sub(Rscratch, SP, Rscratch);
       assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
       andcc(Rscratch, 0xfffff003, Rscratch);
       if (counters != NULL) {
         // Accounting needs the Rscratch register
         st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
         cond_inc(Assembler::equal, (address) counters->fast_path_entry_count_addr(), Rmark, Rscratch);
         ba_short(done);
       } else {
         ba(done);
         delayed()->st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
       }
       bind   (IsInflated);
       if (EmitSync & 64) {
          // If m->owner != null goto IsLocked
          // Test-and-CAS vs CAS
          // Pessimistic form avoids futile (doomed) CAS attempts
          // The optimistic form avoids RTS->RTO cache line upgrades.
          ld_ptr(Rmark, ObjectMonitor::owner_offset_in_bytes() - 2, Rscratch);
          andcc(Rscratch, Rscratch, G0);
          brx(Assembler::notZero, false, Assembler::pn, done);
          delayed()->nop();
          // m->owner == null : it's unlocked.
       }
       // Try to CAS m->owner from null to Self
       // Invariant: if we acquire the lock then _recursions should be 0.
       add(Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark);
       mov(G2_thread, Rscratch);
       casn(Rmark, G0, Rscratch);
       cmp(Rscratch, G0);
       // ST box->displaced_header = NonZero.
       // Any non-zero value suffices:
       //    unused_mark(), G2_thread, RBox, RScratch, rsp, etc.
       st_ptr(Rbox, Rbox, BasicLock::displaced_header_offset_in_bytes());
       // Intentional fall-through into done
    }
    bind   (done);
 }
 void MacroAssembler::compiler_unlock_object(Register Roop, Register Rmark,
                                             Register Rbox, Register Rscratch,
                                             bool try_bias) {
    Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
    Label done ;
    if (EmitSync & 4) {
      cmp(SP, G0);
      return ;
    }
    if (EmitSync & 8) {
      if (try_bias) {
         biased_locking_exit(mark_addr, Rscratch, done);
      }
      // Test first if it is a fast recursive unlock
      ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rmark);
      br_null_short(Rmark, Assembler::pt, done);
      // 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
      assert(mark_addr.disp() == 0, "cas must take a zero displacement");
      casx_under_lock(mark_addr.base(), Rbox, Rmark,
        (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
      ba(done);
      delayed()->cmp(Rbox, Rmark);
      bind(done);
      return ;
    }
    // Beware ... If the aggregate size of the code emitted by CLO and CUO is
    // is too large performance rolls abruptly off a cliff.
    // This could be related to inlining policies, code cache management, or
    // I$ effects.
    Label LStacked ;
    if (try_bias) {
       // TODO: eliminate redundant LDs of obj->mark
       biased_locking_exit(mark_addr, Rscratch, done);
    }
    ld_ptr(Roop, oopDesc::mark_offset_in_bytes(), Rmark);
    ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rscratch);
    andcc(Rscratch, Rscratch, G0);
    brx(Assembler::zero, false, Assembler::pn, done);
    delayed()->nop();      // consider: relocate fetch of mark, above, into this DS
    andcc(Rmark, 2, G0);
    brx(Assembler::zero, false, Assembler::pt, LStacked);
    delayed()->nop();
    // It's inflated
    // Conceptually we need a #loadstore|#storestore "release" MEMBAR before
    // the ST of 0 into _owner which releases the lock.  This prevents loads
    // and stores within the critical section from reordering (floating)
    // past the store that releases the lock.  But TSO is a strong memory model
    // and that particular flavor of barrier is a noop, so we can safely elide it.
    // Note that we use 1-0 locking by default for the inflated case.  We
    // close the resultant (and rare) race by having contented threads in
    // monitorenter periodically poll _owner.
    ld_ptr(Rmark, ObjectMonitor::owner_offset_in_bytes() - 2, Rscratch);
    ld_ptr(Rmark, ObjectMonitor::recursions_offset_in_bytes() - 2, Rbox);
    xor3(Rscratch, G2_thread, Rscratch);
    orcc(Rbox, Rscratch, Rbox);
    brx(Assembler::notZero, false, Assembler::pn, done);
    delayed()->
    ld_ptr(Rmark, ObjectMonitor::EntryList_offset_in_bytes() - 2, Rscratch);
    ld_ptr(Rmark, ObjectMonitor::cxq_offset_in_bytes() - 2, Rbox);
    orcc(Rbox, Rscratch, G0);
    if (EmitSync & 65536) {
       Label LSucc ;
       brx(Assembler::notZero, false, Assembler::pn, LSucc);
       delayed()->nop();
       ba(done);
       delayed()->st_ptr(G0, Rmark, ObjectMonitor::owner_offset_in_bytes() - 2);
       bind(LSucc);
       st_ptr(G0, Rmark, ObjectMonitor::owner_offset_in_bytes() - 2);
       if (os::is_MP()) { membar (StoreLoad); }
       ld_ptr(Rmark, ObjectMonitor::succ_offset_in_bytes() - 2, Rscratch);
       andcc(Rscratch, Rscratch, G0);
       brx(Assembler::notZero, false, Assembler::pt, done);
       delayed()->andcc(G0, G0, G0);
       add(Rmark, ObjectMonitor::owner_offset_in_bytes()-2, Rmark);
       mov(G2_thread, Rscratch);
       casn(Rmark, G0, Rscratch);
       // invert icc.zf and goto done
       br_notnull(Rscratch, false, Assembler::pt, done);
       delayed()->cmp(G0, G0);
       ba(done);
       delayed()->cmp(G0, 1);
    } else {
       brx(Assembler::notZero, false, Assembler::pn, done);
       delayed()->nop();
       ba(done);
       delayed()->st_ptr(G0, Rmark, ObjectMonitor::owner_offset_in_bytes() - 2);
    }
    bind   (LStacked);
    // Consider: we could replace the expensive CAS in the exit
    // path with a simple ST of the displaced mark value fetched from
    // the on-stack basiclock box.  That admits a race where a thread T2
    // in the slow lock path -- inflating with monitor M -- could race a
    // thread T1 in the fast unlock path, resulting in a missed wakeup for T2.
    // More precisely T1 in the stack-lock unlock path could "stomp" the
    // inflated mark value M installed by T2, resulting in an orphan
    // object monitor M and T2 becoming stranded.  We can remedy that situation
    // by having T2 periodically poll the object's mark word using timed wait
    // operations.  If T2 discovers that a stomp has occurred it vacates
    // the monitor M and wakes any other threads stranded on the now-orphan M.
    // In addition the monitor scavenger, which performs deflation,
    // would also need to check for orpan monitors and stranded threads.
    //
    // Finally, inflation is also used when T2 needs to assign a hashCode
    // to O and O is stack-locked by T1.  The "stomp" race could cause
    // an assigned hashCode value to be lost.  We can avoid that condition
    // and provide the necessary hashCode stability invariants by ensuring
    // that hashCode generation is idempotent between copying GCs.
    // For example we could compute the hashCode of an object O as
    // O's heap address XOR some high quality RNG value that is refreshed
    // at GC-time.  The monitor scavenger would install the hashCode
    // found in any orphan monitors.  Again, the mechanism admits a
    // lost-update "stomp" WAW race but detects and recovers as needed.
    //
    // A prototype implementation showed excellent results, although
    // the scavenger and timeout code was rather involved.
    casn(mark_addr.base(), Rbox, Rscratch);
    cmp(Rbox, Rscratch);
    // Intentional fall through into done ...
    bind(done);
 }
 void MacroAssembler::print_CPU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::verify_FPU(int stack_depth, const char* s) {
   // %%%%% need to implement this
 }
 void MacroAssembler::push_IU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::pop_IU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::push_FPU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::pop_FPU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::push_CPU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::pop_CPU_state() {
   // %%%%% need to implement this
 }
 void MacroAssembler::verify_tlab() {
 #ifdef ASSERT
   if (UseTLAB && VerifyOops) {
     Label next, next2, ok;
     Register t1 = L0;
     Register t2 = L1;
     Register t3 = L2;
     save_frame(0);
     ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
     ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t2);
     or3(t1, t2, t3);
     cmp_and_br_short(t1, t2, Assembler::greaterEqual, Assembler::pn, next);
     STOP("assert(top >= start)");
     should_not_reach_here();
     bind(next);
     ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), t1);
     ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t2);
     or3(t3, t2, t3);
     cmp_and_br_short(t1, t2, Assembler::lessEqual, Assembler::pn, next2);
     STOP("assert(top <= end)");
     should_not_reach_here();
     bind(next2);
     and3(t3, MinObjAlignmentInBytesMask, t3);
     cmp_and_br_short(t3, 0, Assembler::lessEqual, Assembler::pn, ok);
     STOP("assert(aligned)");
     should_not_reach_here();
     bind(ok);
     restore();
   }
 #endif
 }
 void MacroAssembler::eden_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
 ){
   // make sure arguments make sense
   assert_different_registers(obj, var_size_in_bytes, t1, t2);
   assert(0 <= con_size_in_bytes && Assembler::is_simm13(con_size_in_bytes), "illegal object size");
   assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
   if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
     // No allocation in the shared eden.
     ba_short(slow_case);
   } else {
     // get eden boundaries
     // note: we need both top & top_addr!
     const Register top_addr = t1;
     const Register end      = t2;
     CollectedHeap* ch = Universe::heap();
     set((intx)ch->top_addr(), top_addr);
     intx delta = (intx)ch->end_addr() - (intx)ch->top_addr();
     ld_ptr(top_addr, delta, end);
     ld_ptr(top_addr, 0, obj);
     // try to allocate
     Label retry;
     bind(retry);
 #ifdef ASSERT
     // make sure eden top is properly aligned
     {
       Label L;
       btst(MinObjAlignmentInBytesMask, obj);
       br(Assembler::zero, false, Assembler::pt, L);
       delayed()->nop();
       STOP("eden top is not properly aligned");
       bind(L);
     }
 #endif // ASSERT
     const Register free = end;
     sub(end, obj, free);                                   // compute amount of free space
     if (var_size_in_bytes->is_valid()) {
       // size is unknown at compile time
       cmp(free, var_size_in_bytes);
       br(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
       delayed()->add(obj, var_size_in_bytes, end);
     } else {
       // size is known at compile time
       cmp(free, con_size_in_bytes);
       br(Assembler::lessUnsigned, false, Assembler::pn, slow_case); // if there is not enough space go the slow case
       delayed()->add(obj, con_size_in_bytes, end);
     }
     // Compare obj with the value at top_addr; if still equal, swap the value of
     // end with the value at top_addr. If not equal, read the value at top_addr
     // into end.
     casx_under_lock(top_addr, obj, end, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
     // if someone beat us on the allocation, try again, otherwise continue
     cmp(obj, end);
     brx(Assembler::notEqual, false, Assembler::pn, retry);
     delayed()->mov(end, obj);                              // nop if successfull since obj == end
 #ifdef ASSERT
     // make sure eden top is properly aligned
     {
       Label L;
       const Register top_addr = t1;
       set((intx)ch->top_addr(), top_addr);
       ld_ptr(top_addr, 0, top_addr);
       btst(MinObjAlignmentInBytesMask, top_addr);
       br(Assembler::zero, false, Assembler::pt, L);
       delayed()->nop();
       STOP("eden top is not properly aligned");
       bind(L);
     }
 #endif // ASSERT
   }
 }
 void MacroAssembler::tlab_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
   Label&   slow_case                   // continuation point if fast allocation fails
 ){
   // make sure arguments make sense
   assert_different_registers(obj, var_size_in_bytes, t1);
   assert(0 <= con_size_in_bytes && is_simm13(con_size_in_bytes), "illegal object size");
   assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, "object size is not multiple of alignment");
   const Register free  = t1;
   verify_tlab();
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), obj);
   // calculate amount of free space
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), free);
   sub(free, obj, free);
   Label done;
   if (var_size_in_bytes == noreg) {
     cmp(free, con_size_in_bytes);
   } else {
     cmp(free, var_size_in_bytes);
   }
   br(Assembler::less, false, Assembler::pn, slow_case);
   // calculate the new top pointer
   if (var_size_in_bytes == noreg) {
     delayed()->add(obj, con_size_in_bytes, free);
   } else {
     delayed()->add(obj, var_size_in_bytes, free);
   }
   bind(done);
 #ifdef ASSERT
   // make sure new free pointer is properly aligned
   {
     Label L;
     btst(MinObjAlignmentInBytesMask, free);
     br(Assembler::zero, false, Assembler::pt, L);
     delayed()->nop();
     STOP("updated TLAB free is not properly aligned");
     bind(L);
   }
 #endif // ASSERT
   // update the tlab top pointer
   st_ptr(free, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
   verify_tlab();
 }
 void MacroAssembler::tlab_refill(Label& retry, Label& try_eden, Label& slow_case) {
   Register top = O0;
   Register t1 = G1;
   Register t2 = G3;
   Register t3 = O1;
   assert_different_registers(top, t1, t2, t3, G4, G5 /* preserve G4 and G5 */);
   Label do_refill, discard_tlab;
   if (CMSIncrementalMode || !Universe::heap()->supports_inline_contig_alloc()) {
     // No allocation in the shared eden.
     ba_short(slow_case);
   }
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_top_offset()), top);
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_end_offset()), t1);
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()), t2);
   // calculate amount of free space
   sub(t1, top, t1);
   srl_ptr(t1, LogHeapWordSize, t1);
   // Retain tlab and allocate object in shared space if
   // the amount free in the tlab is too large to discard.
   cmp(t1, t2);
   brx(Assembler::lessEqual, false, Assembler::pt, discard_tlab);
   // increment waste limit to prevent getting stuck on this slow path
   delayed()->add(t2, ThreadLocalAllocBuffer::refill_waste_limit_increment(), t2);
   st_ptr(t2, G2_thread, in_bytes(JavaThread::tlab_refill_waste_limit_offset()));
   if (TLABStats) {
     // increment number of slow_allocations
     ld(G2_thread, in_bytes(JavaThread::tlab_slow_allocations_offset()), t2);
     add(t2, 1, t2);
     stw(t2, G2_thread, in_bytes(JavaThread::tlab_slow_allocations_offset()));
   }
   ba_short(try_eden);
   bind(discard_tlab);
   if (TLABStats) {
     // increment number of refills
     ld(G2_thread, in_bytes(JavaThread::tlab_number_of_refills_offset()), t2);
     add(t2, 1, t2);
     stw(t2, G2_thread, in_bytes(JavaThread::tlab_number_of_refills_offset()));
     // accumulate wastage
     ld(G2_thread, in_bytes(JavaThread::tlab_fast_refill_waste_offset()), t2);
     add(t2, t1, t2);
     stw(t2, G2_thread, in_bytes(JavaThread::tlab_fast_refill_waste_offset()));
   }
   // if tlab is currently allocated (top or end != null) then
   // fill [top, end + alignment_reserve) with array object
   br_null_short(top, Assembler::pn, do_refill);
   set((intptr_t)markOopDesc::prototype()->copy_set_hash(0x2), t2);
   st_ptr(t2, top, oopDesc::mark_offset_in_bytes()); // set up the mark word
   // set klass to intArrayKlass
   sub(t1, typeArrayOopDesc::header_size(T_INT), t1);
   add(t1, ThreadLocalAllocBuffer::alignment_reserve(), t1);
   sll_ptr(t1, log2_intptr(HeapWordSize/sizeof(jint)), t1);
   st(t1, top, arrayOopDesc::length_offset_in_bytes());
   set((intptr_t)Universe::intArrayKlassObj_addr(), t2);
   ld_ptr(t2, 0, t2);
   // store klass last.  concurrent gcs assumes klass length is valid if
   // klass field is not null.
   store_klass(t2, top);
   verify_oop(top);
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t1);
   sub(top, t1, t1); // size of tlab's allocated portion
   incr_allocated_bytes(t1, t2, t3);
   // refill the tlab with an eden allocation
   bind(do_refill);
   ld_ptr(G2_thread, in_bytes(JavaThread::tlab_size_offset()), t1);
   sll_ptr(t1, LogHeapWordSize, t1);
   // allocate new tlab, address returned in top
   eden_allocate(top, t1, 0, t2, t3, slow_case);
   st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_start_offset()));
   st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_top_offset()));
 #ifdef ASSERT
   // check that tlab_size (t1) is still valid
   {
     Label ok;
     ld_ptr(G2_thread, in_bytes(JavaThread::tlab_size_offset()), t2);
     sll_ptr(t2, LogHeapWordSize, t2);
     cmp_and_br_short(t1, t2, Assembler::equal, Assembler::pt, ok);
     STOP("assert(t1 == tlab_size)");
     should_not_reach_here();
     bind(ok);
   }
 #endif // ASSERT
   add(top, t1, top); // t1 is tlab_size
   sub(top, ThreadLocalAllocBuffer::alignment_reserve_in_bytes(), top);
   st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_end_offset()));
   verify_tlab();
   ba_short(retry);
 }
 void MacroAssembler::incr_allocated_bytes(RegisterOrConstant size_in_bytes,
                                           Register t1, Register t2) {
   // Bump total bytes allocated by this thread
   assert(t1->is_global(), "must be global reg"); // so all 64 bits are saved on a context switch
   assert_different_registers(size_in_bytes.register_or_noreg(), t1, t2);
   // v8 support has gone the way of the dodo
   ldx(G2_thread, in_bytes(JavaThread::allocated_bytes_offset()), t1);
   add(t1, ensure_simm13_or_reg(size_in_bytes, t2), t1);
   stx(t1, G2_thread, in_bytes(JavaThread::allocated_bytes_offset()));
 }
 Assembler::Condition MacroAssembler::negate_condition(Assembler::Condition cond) {
   switch (cond) {
     // Note some conditions are synonyms for others
     case Assembler::never:                return Assembler::always;
     case Assembler::zero:                 return Assembler::notZero;
     case Assembler::lessEqual:            return Assembler::greater;
     case Assembler::less:                 return Assembler::greaterEqual;
     case Assembler::lessEqualUnsigned:    return Assembler::greaterUnsigned;
     case Assembler::lessUnsigned:         return Assembler::greaterEqualUnsigned;
     case Assembler::negative:             return Assembler::positive;
     case Assembler::overflowSet:          return Assembler::overflowClear;
     case Assembler::always:               return Assembler::never;
     case Assembler::notZero:              return Assembler::zero;
     case Assembler::greater:              return Assembler::lessEqual;
     case Assembler::greaterEqual:         return Assembler::less;
     case Assembler::greaterUnsigned:      return Assembler::lessEqualUnsigned;
     case Assembler::greaterEqualUnsigned: return Assembler::lessUnsigned;
     case Assembler::positive:             return Assembler::negative;
     case Assembler::overflowClear:        return Assembler::overflowSet;
   }
   ShouldNotReachHere(); return Assembler::overflowClear;
 }
 void MacroAssembler::cond_inc(Assembler::Condition cond, address counter_ptr,
                               Register Rtmp1, Register Rtmp2 /*, Register Rtmp3, Register Rtmp4 */) {
   Condition negated_cond = negate_condition(cond);
   Label L;
   brx(negated_cond, false, Assembler::pt, L);
   delayed()->nop();
   inc_counter(counter_ptr, Rtmp1, Rtmp2);
   bind(L);
 }
 void MacroAssembler::inc_counter(address counter_addr, Register Rtmp1, Register Rtmp2) {
   AddressLiteral addrlit(counter_addr);
   sethi(addrlit, Rtmp1);                 // Move hi22 bits into temporary register.
   Address addr(Rtmp1, addrlit.low10());  // Build an address with low10 bits.
   ld(addr, Rtmp2);
   inc(Rtmp2);
   st(Rtmp2, addr);
 }
 void MacroAssembler::inc_counter(int* counter_addr, Register Rtmp1, Register Rtmp2) {
   inc_counter((address) counter_addr, Rtmp1, Rtmp2);
 }
 SkipIfEqual::SkipIfEqual(
     MacroAssembler* masm, Register temp, const bool* flag_addr,
     Assembler::Condition condition) {
   _masm = masm;
   AddressLiteral flag(flag_addr);
   _masm->sethi(flag, temp);
   _masm->ldub(temp, flag.low10(), temp);
   _masm->tst(temp);
   _masm->br(condition, false, Assembler::pt, _label);
   _masm->delayed()->nop();
 }
 SkipIfEqual::~SkipIfEqual() {
   _masm->bind(_label);
 }
 // Writes to stack successive pages until offset reached to check for
 // stack overflow + shadow pages.  This clobbers tsp and scratch.
 void MacroAssembler::bang_stack_size(Register Rsize, Register Rtsp,
                                      Register Rscratch) {
   // Use stack pointer in temp stack pointer
   mov(SP, Rtsp);
   // Bang stack for total size given plus stack shadow page size.
   // Bang one page at a time because a large size can overflow yellow and
   // red zones (the bang will fail but stack overflow handling can't tell that
   // it was a stack overflow bang vs a regular segv).
   int offset = os::vm_page_size();
   Register Roffset = Rscratch;
   Label loop;
   bind(loop);
   set((-offset)+STACK_BIAS, Rscratch);
   st(G0, Rtsp, Rscratch);
   set(offset, Roffset);
   sub(Rsize, Roffset, Rsize);
   cmp(Rsize, G0);
   br(Assembler::greater, false, Assembler::pn, loop);
   delayed()->sub(Rtsp, Roffset, Rtsp);
   // Bang down shadow pages too.
   // The -1 because we already subtracted 1 page.
   for (int i = 0; i< StackShadowPages-1; i++) {
     set((-i*offset)+STACK_BIAS, Rscratch);
     st(G0, Rtsp, Rscratch);
   }
 }
 ///////////////////////////////////////////////////////////////////////////////////
 #if INCLUDE_ALL_GCS
 static address satb_log_enqueue_with_frame = NULL;
 static u_char* satb_log_enqueue_with_frame_end = NULL;
 static address satb_log_enqueue_frameless = NULL;
 static u_char* satb_log_enqueue_frameless_end = NULL;
 static int EnqueueCodeSize = 128 DEBUG_ONLY( + 256); // Instructions?
 static void generate_satb_log_enqueue(bool with_frame) {
   BufferBlob* bb = BufferBlob::create("enqueue_with_frame", EnqueueCodeSize);
   CodeBuffer buf(bb);
   MacroAssembler masm(&buf);
 #define __ masm.
   address start = __ pc();
   Register pre_val;
   Label refill, restart;
   if (with_frame) {
     __ save_frame(0);
     pre_val = I0;  // Was O0 before the save.
   } else {
     pre_val = O0;
   }
   int satb_q_index_byte_offset =
     in_bytes(JavaThread::satb_mark_queue_offset() +
              PtrQueue::byte_offset_of_index());
   int satb_q_buf_byte_offset =
     in_bytes(JavaThread::satb_mark_queue_offset() +
              PtrQueue::byte_offset_of_buf());
   assert(in_bytes(PtrQueue::byte_width_of_index()) == sizeof(intptr_t) &&
          in_bytes(PtrQueue::byte_width_of_buf()) == sizeof(intptr_t),
          "check sizes in assembly below");
   __ bind(restart);
   // Load the index into the SATB buffer. PtrQueue::_index is a size_t
   // so ld_ptr is appropriate.
   __ ld_ptr(G2_thread, satb_q_index_byte_offset, L0);
   // index == 0?
   __ cmp_and_brx_short(L0, G0, Assembler::equal, Assembler::pn, refill);
   __ ld_ptr(G2_thread, satb_q_buf_byte_offset, L1);
   __ sub(L0, oopSize, L0);
   __ st_ptr(pre_val, L1, L0);  // [_buf + index] := I0
   if (!with_frame) {
     // Use return-from-leaf
     __ retl();
     __ delayed()->st_ptr(L0, G2_thread, satb_q_index_byte_offset);
   } else {
     // Not delayed.
     __ st_ptr(L0, G2_thread, satb_q_index_byte_offset);
   }
   if (with_frame) {
     __ ret();
     __ delayed()->restore();
   }
   __ bind(refill);
   address handle_zero =
     CAST_FROM_FN_PTR(address,
                      &SATBMarkQueueSet::handle_zero_index_for_thread);
   // This should be rare enough that we can afford to save all the
   // scratch registers that the calling context might be using.
   __ mov(G1_scratch, L0);
   __ mov(G3_scratch, L1);
   __ mov(G4, L2);
   // We need the value of O0 above (for the write into the buffer), so we
   // save and restore it.
   __ mov(O0, L3);
   // Since the call will overwrite O7, we save and restore that, as well.
   __ mov(O7, L4);
   __ call_VM_leaf(L5, handle_zero, G2_thread);
   __ mov(L0, G1_scratch);
   __ mov(L1, G3_scratch);
   __ mov(L2, G4);
   __ mov(L3, O0);
   __ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
   __ delayed()->mov(L4, O7);
   if (with_frame) {
     satb_log_enqueue_with_frame = start;
     satb_log_enqueue_with_frame_end = __ pc();
   } else {
     satb_log_enqueue_frameless = start;
     satb_log_enqueue_frameless_end = __ pc();
   }
 #undef __
 }
 static inline void generate_satb_log_enqueue_if_necessary(bool with_frame) {
   if (with_frame) {
     if (satb_log_enqueue_with_frame == 0) {
       generate_satb_log_enqueue(with_frame);
       assert(satb_log_enqueue_with_frame != 0, "postcondition.");
       if (G1SATBPrintStubs) {
         tty->print_cr("Generated with-frame satb enqueue:");
         Disassembler::decode((u_char*)satb_log_enqueue_with_frame,
                              satb_log_enqueue_with_frame_end,
                              tty);
       }
     }
   } else {
     if (satb_log_enqueue_frameless == 0) {
       generate_satb_log_enqueue(with_frame);
       assert(satb_log_enqueue_frameless != 0, "postcondition.");
       if (G1SATBPrintStubs) {
         tty->print_cr("Generated frameless satb enqueue:");
         Disassembler::decode((u_char*)satb_log_enqueue_frameless,
                              satb_log_enqueue_frameless_end,
                              tty);
       }
     }
   }
 }
 void MacroAssembler::g1_write_barrier_pre(Register obj,
                                           Register index,
                                           int offset,
                                           Register pre_val,
                                           Register tmp,
                                           bool preserve_o_regs) {
   Label filtered;
   if (obj == noreg) {
     // We are not loading the previous value so make
     // sure that we don't trash the value in pre_val
     // with the code below.
     assert_different_registers(pre_val, tmp);
   } else {
     // We will be loading the previous value
     // in this code so...
     assert(offset == 0 || index == noreg, "choose one");
     assert(pre_val == noreg, "check this code");
   }
   // Is marking active?
   if (in_bytes(PtrQueue::byte_width_of_active()) == 4) {
     ld(G2,
        in_bytes(JavaThread::satb_mark_queue_offset() +
                 PtrQueue::byte_offset_of_active()),
        tmp);
   } else {
     guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1,
               "Assumption");
     ldsb(G2,
          in_bytes(JavaThread::satb_mark_queue_offset() +
                   PtrQueue::byte_offset_of_active()),
          tmp);
   }
   // Is marking active?
   cmp_and_br_short(tmp, G0, Assembler::equal, Assembler::pt, filtered);
   // Do we need to load the previous value?
   if (obj != noreg) {
     // Load the previous value...
     if (index == noreg) {
       if (Assembler::is_simm13(offset)) {
         load_heap_oop(obj, offset, tmp);
       } else {
         set(offset, tmp);
         load_heap_oop(obj, tmp, tmp);
       }
     } else {
       load_heap_oop(obj, index, tmp);
     }
     // Previous value has been loaded into tmp
     pre_val = tmp;
   }
   assert(pre_val != noreg, "must have a real register");
   // Is the previous value null?
   cmp_and_brx_short(pre_val, G0, Assembler::equal, Assembler::pt, filtered);
   // OK, it's not filtered, so we'll need to call enqueue.  In the normal
   // case, pre_val will be a scratch G-reg, but there are some cases in
   // which it's an O-reg.  In the first case, do a normal call.  In the
   // latter, do a save here and call the frameless version.
   guarantee(pre_val->is_global() || pre_val->is_out(),
             "Or we need to think harder.");
   if (pre_val->is_global() && !preserve_o_regs) {
     generate_satb_log_enqueue_if_necessary(true); // with frame
     call(satb_log_enqueue_with_frame);
     delayed()->mov(pre_val, O0);
   } else {
     generate_satb_log_enqueue_if_necessary(false); // frameless
     save_frame(0);
     call(satb_log_enqueue_frameless);
     delayed()->mov(pre_val->after_save(), O0);
     restore();
   }
   bind(filtered);
 }
 static address dirty_card_log_enqueue = 0;
 static u_char* dirty_card_log_enqueue_end = 0;
 // This gets to assume that o0 contains the object address.
 static void generate_dirty_card_log_enqueue(jbyte* byte_map_base) {
   BufferBlob* bb = BufferBlob::create("dirty_card_enqueue", EnqueueCodeSize*2);
   CodeBuffer buf(bb);
   MacroAssembler masm(&buf);
 #define __ masm.
   address start = __ pc();
   Label not_already_dirty, restart, refill;
 #ifdef _LP64
   __ srlx(O0, CardTableModRefBS::card_shift, O0);
 #else
   __ srl(O0, CardTableModRefBS::card_shift, O0);
 #endif
   AddressLiteral addrlit(byte_map_base);
   __ set(addrlit, O1); // O1 := <card table base>
   __ ldub(O0, O1, O2); // O2 := [O0 + O1]
   assert(CardTableModRefBS::dirty_card_val() == 0, "otherwise check this code");
   __ cmp_and_br_short(O2, G0, Assembler::notEqual, Assembler::pt, not_already_dirty);
   // We didn't take the branch, so we're already dirty: return.
   // Use return-from-leaf
   __ retl();
   __ delayed()->nop();
   // Not dirty.
   __ bind(not_already_dirty);
   // Get O0 + O1 into a reg by itself
   __ add(O0, O1, O3);
   // First, dirty it.
   __ stb(G0, O3, G0);  // [cardPtr] := 0  (i.e., dirty).
   int dirty_card_q_index_byte_offset =
     in_bytes(JavaThread::dirty_card_queue_offset() +
              PtrQueue::byte_offset_of_index());
   int dirty_card_q_buf_byte_offset =
     in_bytes(JavaThread::dirty_card_queue_offset() +
              PtrQueue::byte_offset_of_buf());
   __ bind(restart);
   // Load the index into the update buffer. PtrQueue::_index is
   // a size_t so ld_ptr is appropriate here.
   __ ld_ptr(G2_thread, dirty_card_q_index_byte_offset, L0);
   // index == 0?
   __ cmp_and_brx_short(L0, G0, Assembler::equal, Assembler::pn, refill);
   __ ld_ptr(G2_thread, dirty_card_q_buf_byte_offset, L1);
   __ sub(L0, oopSize, L0);
   __ st_ptr(O3, L1, L0);  // [_buf + index] := I0
   // Use return-from-leaf
   __ retl();
   __ delayed()->st_ptr(L0, G2_thread, dirty_card_q_index_byte_offset);
   __ bind(refill);
   address handle_zero =
     CAST_FROM_FN_PTR(address,
                      &DirtyCardQueueSet::handle_zero_index_for_thread);
   // This should be rare enough that we can afford to save all the
   // scratch registers that the calling context might be using.
   __ mov(G1_scratch, L3);
   __ mov(G3_scratch, L5);
   // We need the value of O3 above (for the write into the buffer), so we
   // save and restore it.
   __ mov(O3, L6);
   // Since the call will overwrite O7, we save and restore that, as well.
   __ mov(O7, L4);
   __ call_VM_leaf(L7_thread_cache, handle_zero, G2_thread);
   __ mov(L3, G1_scratch);
   __ mov(L5, G3_scratch);
   __ mov(L6, O3);
   __ br(Assembler::always, /*annul*/false, Assembler::pt, restart);
   __ delayed()->mov(L4, O7);
   dirty_card_log_enqueue = start;
   dirty_card_log_enqueue_end = __ pc();
   // XXX Should have a guarantee here about not going off the end!
   // Does it already do so?  Do an experiment...
 #undef __
 }
 static inline void
 generate_dirty_card_log_enqueue_if_necessary(jbyte* byte_map_base) {
   if (dirty_card_log_enqueue == 0) {
     generate_dirty_card_log_enqueue(byte_map_base);
     assert(dirty_card_log_enqueue != 0, "postcondition.");
     if (G1SATBPrintStubs) {
       tty->print_cr("Generated dirty_card enqueue:");
       Disassembler::decode((u_char*)dirty_card_log_enqueue,
                            dirty_card_log_enqueue_end,
                            tty);
     }
   }
 }
 void MacroAssembler::g1_write_barrier_post(Register store_addr, Register new_val, Register tmp) {
   Label filtered;
   MacroAssembler* post_filter_masm = this;
   if (new_val == G0) return;
   G1SATBCardTableModRefBS* bs = (G1SATBCardTableModRefBS*) Universe::heap()->barrier_set();
   assert(bs->kind() == BarrierSet::G1SATBCT ||
          bs->kind() == BarrierSet::G1SATBCTLogging, "wrong barrier");
   if (G1RSBarrierRegionFilter) {
     xor3(store_addr, new_val, tmp);
 #ifdef _LP64
     srlx(tmp, HeapRegion::LogOfHRGrainBytes, tmp);
 #else
     srl(tmp, HeapRegion::LogOfHRGrainBytes, tmp);
 #endif
     // XXX Should I predict this taken or not?  Does it matter?
     cmp_and_brx_short(tmp, G0, Assembler::equal, Assembler::pt, filtered);
   }
   // If the "store_addr" register is an "in" or "local" register, move it to
   // a scratch reg so we can pass it as an argument.
   bool use_scr = !(store_addr->is_global() || store_addr->is_out());
   // Pick a scratch register different from "tmp".
   Register scr = (tmp == G1_scratch ? G3_scratch : G1_scratch);
   // Make sure we use up the delay slot!
   if (use_scr) {
     post_filter_masm->mov(store_addr, scr);
   } else {
     post_filter_masm->nop();
   }
   generate_dirty_card_log_enqueue_if_necessary(bs->byte_map_base);
   save_frame(0);
   call(dirty_card_log_enqueue);
   if (use_scr) {
     delayed()->mov(scr, O0);
   } else {
     delayed()->mov(store_addr->after_save(), O0);
   }
   restore();
   bind(filtered);
 }
 #endif // INCLUDE_ALL_GCS
 ///////////////////////////////////////////////////////////////////////////////////
 void MacroAssembler::card_write_barrier_post(Register store_addr, Register new_val, Register tmp) {
   // If we're writing constant NULL, we can skip the write barrier.
   if (new_val == G0) return;
   CardTableModRefBS* bs = (CardTableModRefBS*) Universe::heap()->barrier_set();
   assert(bs->kind() == BarrierSet::CardTableModRef ||
          bs->kind() == BarrierSet::CardTableExtension, "wrong barrier");
   card_table_write(bs->byte_map_base, tmp, store_addr);
 }
 void MacroAssembler::load_klass(Register src_oop, Register klass) {
   // The number of bytes in this code is used by
   // MachCallDynamicJavaNode::ret_addr_offset()
   // if this changes, change that.
   if (UseCompressedKlassPointers) {
     lduw(src_oop, oopDesc::klass_offset_in_bytes(), klass);
     decode_klass_not_null(klass);
   } else {
     ld_ptr(src_oop, oopDesc::klass_offset_in_bytes(), klass);
   }
 }
 void MacroAssembler::store_klass(Register klass, Register dst_oop) {
   if (UseCompressedKlassPointers) {
     assert(dst_oop != klass, "not enough registers");
     encode_klass_not_null(klass);
     st(klass, dst_oop, oopDesc::klass_offset_in_bytes());
   } else {
     st_ptr(klass, dst_oop, oopDesc::klass_offset_in_bytes());
   }
 }
 void MacroAssembler::store_klass_gap(Register s, Register d) {
   if (UseCompressedKlassPointers) {
     assert(s != d, "not enough registers");
     st(s, d, oopDesc::klass_gap_offset_in_bytes());
   }
 }
 void MacroAssembler::load_heap_oop(const Address& s, Register d) {
   if (UseCompressedOops) {
     lduw(s, d);
     decode_heap_oop(d);
   } else {
     ld_ptr(s, d);
   }
 }
 void MacroAssembler::load_heap_oop(Register s1, Register s2, Register d) {
    if (UseCompressedOops) {
     lduw(s1, s2, d);
     decode_heap_oop(d, d);
   } else {
     ld_ptr(s1, s2, d);
   }
 }
 void MacroAssembler::load_heap_oop(Register s1, int simm13a, Register d) {
    if (UseCompressedOops) {
     lduw(s1, simm13a, d);
     decode_heap_oop(d, d);
   } else {
     ld_ptr(s1, simm13a, d);
   }
 }
 void MacroAssembler::load_heap_oop(Register s1, RegisterOrConstant s2, Register d) {
   if (s2.is_constant())  load_heap_oop(s1, s2.as_constant(), d);
   else                   load_heap_oop(s1, s2.as_register(), d);
 }
 void MacroAssembler::store_heap_oop(Register d, Register s1, Register s2) {
   if (UseCompressedOops) {
     assert(s1 != d && s2 != d, "not enough registers");
     encode_heap_oop(d);
     st(d, s1, s2);
   } else {
     st_ptr(d, s1, s2);
   }
 }
 void MacroAssembler::store_heap_oop(Register d, Register s1, int simm13a) {
   if (UseCompressedOops) {
     assert(s1 != d, "not enough registers");
     encode_heap_oop(d);
     st(d, s1, simm13a);
   } else {
     st_ptr(d, s1, simm13a);
   }
 }
 void MacroAssembler::store_heap_oop(Register d, const Address& a, int offset) {
   if (UseCompressedOops) {
     assert(a.base() != d, "not enough registers");
     encode_heap_oop(d);
     st(d, a, offset);
   } else {
     st_ptr(d, a, offset);
   }
 }
 void MacroAssembler::encode_heap_oop(Register src, Register dst) {
   assert (UseCompressedOops, "must be compressed");
   assert (Universe::heap() != NULL, "java heap should be initialized");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   verify_oop(src);
   if (Universe::narrow_oop_base() == NULL) {
     srlx(src, LogMinObjAlignmentInBytes, dst);
     return;
   }
   Label done;
   if (src == dst) {
     // optimize for frequent case src == dst
     bpr(rc_nz, true, Assembler::pt, src, done);
     delayed() -> sub(src, G6_heapbase, dst); // annuled if not taken
     bind(done);
     srlx(src, LogMinObjAlignmentInBytes, dst);
   } else {
     bpr(rc_z, false, Assembler::pn, src, done);
     delayed() -> mov(G0, dst);
     // could be moved before branch, and annulate delay,
     // but may add some unneeded work decoding null
     sub(src, G6_heapbase, dst);
     srlx(dst, LogMinObjAlignmentInBytes, dst);
     bind(done);
   }
 }
 void MacroAssembler::encode_heap_oop_not_null(Register r) {
   assert (UseCompressedOops, "must be compressed");
   assert (Universe::heap() != NULL, "java heap should be initialized");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   verify_oop(r);
   if (Universe::narrow_oop_base() != NULL)
     sub(r, G6_heapbase, r);
   srlx(r, LogMinObjAlignmentInBytes, r);
 }
 void MacroAssembler::encode_heap_oop_not_null(Register src, Register dst) {
   assert (UseCompressedOops, "must be compressed");
   assert (Universe::heap() != NULL, "java heap should be initialized");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   verify_oop(src);
   if (Universe::narrow_oop_base() == NULL) {
     srlx(src, LogMinObjAlignmentInBytes, dst);
   } else {
     sub(src, G6_heapbase, dst);
     srlx(dst, LogMinObjAlignmentInBytes, dst);
   }
 }
 // Same algorithm as oops.inline.hpp decode_heap_oop.
 void  MacroAssembler::decode_heap_oop(Register src, Register dst) {
   assert (UseCompressedOops, "must be compressed");
   assert (Universe::heap() != NULL, "java heap should be initialized");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   sllx(src, LogMinObjAlignmentInBytes, dst);
   if (Universe::narrow_oop_base() != NULL) {
     Label done;
     bpr(rc_nz, true, Assembler::pt, dst, done);
     delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
     bind(done);
   }
   verify_oop(dst);
 }
 void  MacroAssembler::decode_heap_oop_not_null(Register r) {
   // Do not add assert code to this unless you change vtableStubs_sparc.cpp
   // pd_code_size_limit.
   // Also do not verify_oop as this is called by verify_oop.
   assert (UseCompressedOops, "must be compressed");
   assert (Universe::heap() != NULL, "java heap should be initialized");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   sllx(r, LogMinObjAlignmentInBytes, r);
   if (Universe::narrow_oop_base() != NULL)
     add(r, G6_heapbase, r);
 }
 void  MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
   // Do not add assert code to this unless you change vtableStubs_sparc.cpp
   // pd_code_size_limit.
   // Also do not verify_oop as this is called by verify_oop.
   assert (UseCompressedOops, "must be compressed");
   assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
   sllx(src, LogMinObjAlignmentInBytes, dst);
   if (Universe::narrow_oop_base() != NULL)
     add(dst, G6_heapbase, dst);
 }
 void MacroAssembler::encode_klass_not_null(Register r) {
   assert(Metaspace::is_initialized(), "metaspace should be initialized");
   assert (UseCompressedKlassPointers, "must be compressed");
   assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
   if (Universe::narrow_klass_base() != NULL)
     sub(r, G6_heapbase, r);
   srlx(r, LogKlassAlignmentInBytes, r);
 }
 void MacroAssembler::encode_klass_not_null(Register src, Register dst) {
   assert(Metaspace::is_initialized(), "metaspace should be initialized");
   assert (UseCompressedKlassPointers, "must be compressed");
   assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
   if (Universe::narrow_klass_base() == NULL) {
     srlx(src, LogKlassAlignmentInBytes, dst);
   } else {
     sub(src, G6_heapbase, dst);
     srlx(dst, LogKlassAlignmentInBytes, dst);
   }
 }
 void  MacroAssembler::decode_klass_not_null(Register r) {
   assert(Metaspace::is_initialized(), "metaspace should be initialized");
   // Do not add assert code to this unless you change vtableStubs_sparc.cpp
   // pd_code_size_limit.
   assert (UseCompressedKlassPointers, "must be compressed");
   assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
   sllx(r, LogKlassAlignmentInBytes, r);
   if (Universe::narrow_klass_base() != NULL)
     add(r, G6_heapbase, r);
 }
 void  MacroAssembler::decode_klass_not_null(Register src, Register dst) {
   assert(Metaspace::is_initialized(), "metaspace should be initialized");
   // Do not add assert code to this unless you change vtableStubs_sparc.cpp
   // pd_code_size_limit.
   assert (UseCompressedKlassPointers, "must be compressed");
   assert (LogKlassAlignmentInBytes == Universe::narrow_klass_shift(), "decode alg wrong");
   sllx(src, LogKlassAlignmentInBytes, dst);
   if (Universe::narrow_klass_base() != NULL)
     add(dst, G6_heapbase, dst);
 }
 void MacroAssembler::reinit_heapbase() {
   if (UseCompressedOops || UseCompressedKlassPointers) {
     AddressLiteral base(Universe::narrow_ptrs_base_addr());
     load_ptr_contents(base, G6_heapbase);
   }
 }
 // Compare char[] arrays aligned to 4 bytes.
 void MacroAssembler::char_arrays_equals(Register ary1, Register ary2,
                                         Register limit, Register result,
                                         Register chr1, Register chr2, Label& Ldone) {
   Label Lvector, Lloop;
   assert(chr1 == result, "should be the same");
   // Note: limit contains number of bytes (2*char_elements) != 0.
   andcc(limit, 0x2, chr1); // trailing character ?
   br(Assembler::zero, false, Assembler::pt, Lvector);
   delayed()->nop();
   // compare the trailing char
   sub(limit, sizeof(jchar), limit);
   lduh(ary1, limit, chr1);
   lduh(ary2, limit, chr2);
   cmp(chr1, chr2);
   br(Assembler::notEqual, true, Assembler::pt, Ldone);
   delayed()->mov(G0, result);     // not equal
   // only one char ?
   cmp_zero_and_br(zero, limit, Ldone, true, Assembler::pn);
   delayed()->add(G0, 1, result); // zero-length arrays are equal
   // word by word compare, dont't need alignment check
   bind(Lvector);
   // Shift ary1 and ary2 to the end of the arrays, negate limit
   add(ary1, limit, ary1);
   add(ary2, limit, ary2);
   neg(limit, limit);
   lduw(ary1, limit, chr1);
   bind(Lloop);
   lduw(ary2, limit, chr2);
   cmp(chr1, chr2);
   br(Assembler::notEqual, true, Assembler::pt, Ldone);
   delayed()->mov(G0, result);     // not equal
   inccc(limit, 2*sizeof(jchar));
   // annul LDUW if branch is not taken to prevent access past end of array
   br(Assembler::notZero, true, Assembler::pt, Lloop);
   delayed()->lduw(ary1, limit, chr1); // hoisted
   // Caller should set it:
   // add(G0, 1, result); // equals
 }
 // Use BIS for zeroing (count is in bytes).
 void MacroAssembler::bis_zeroing(Register to, Register count, Register temp, Label& Ldone) {
   assert(UseBlockZeroing && VM_Version::has_block_zeroing(), "only works with BIS zeroing");
   Register end = count;
   int cache_line_size = VM_Version::prefetch_data_size();
   // Minimum count when BIS zeroing can be used since
   // it needs membar which is expensive.
   int block_zero_size  = MAX2(cache_line_size*3, (int)BlockZeroingLowLimit);
   Label small_loop;
   // Check if count is negative (dead code) or zero.
   // Note, count uses 64bit in 64 bit VM.
   cmp_and_brx_short(count, 0, Assembler::lessEqual, Assembler::pn, Ldone);
   // Use BIS zeroing only for big arrays since it requires membar.
   if (Assembler::is_simm13(block_zero_size)) { // < 4096
     cmp(count, block_zero_size);
   } else {
     set(block_zero_size, temp);
     cmp(count, temp);
   }
   br(Assembler::lessUnsigned, false, Assembler::pt, small_loop);
   delayed()->add(to, count, end);
   // Note: size is >= three (32 bytes) cache lines.
   // Clean the beginning of space up to next cache line.
   for (int offs = 0; offs < cache_line_size; offs += 8) {
     stx(G0, to, offs);
   }
   // align to next cache line
   add(to, cache_line_size, to);
   and3(to, -cache_line_size, to);
   // Note: size left >= two (32 bytes) cache lines.
   // BIS should not be used to zero tail (64 bytes)
   // to avoid zeroing a header of the following object.
   sub(end, (cache_line_size*2)-8, end);
   Label bis_loop;
   bind(bis_loop);
   stxa(G0, to, G0, Assembler::ASI_ST_BLKINIT_PRIMARY);
   add(to, cache_line_size, to);
   cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, bis_loop);
   // BIS needs membar.
   membar(Assembler::StoreLoad);
   add(end, (cache_line_size*2)-8, end); // restore end
   cmp_and_brx_short(to, end, Assembler::greaterEqualUnsigned, Assembler::pn, Ldone);
   // Clean the tail.
   bind(small_loop);
   stx(G0, to, 0);
   add(to, 8, to);
   cmp_and_brx_short(to, end, Assembler::lessUnsigned, Assembler::pt, small_loop);
   nop(); // Separate short branches
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/macroAssembler_sparc.cpp@12f651e29f6b (annotated)

src/cpu/sparc/vm/macroAssembler_sparc.cpp