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hotspot/src/cpu/sparc/vm/c1_MacroAssembler_sparc.cpp

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+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_c1_MacroAssembler_sparc.cpp.incl"
+
+void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
+  Label L;
+  const Register temp_reg = G3_scratch;
+  // Note: needs more testing of out-of-line vs. inline slow case
+  Address ic_miss(temp_reg, SharedRuntime::get_ic_miss_stub());
+  verify_oop(receiver);
+  ld_ptr(receiver, oopDesc::klass_offset_in_bytes(), temp_reg);
+  cmp(temp_reg, iCache);
+  brx(Assembler::equal, true, Assembler::pt, L);
+  delayed()->nop();
+  jump_to(ic_miss, 0);
+  delayed()->nop();
+  align(CodeEntryAlignment);
+  bind(L);
+}
+
+
+void C1_MacroAssembler::method_exit(bool restore_frame) {
+  // this code must be structured this way so that the return
+  // instruction can be a safepoint.
+  if (restore_frame) {
+    restore();
+  }
+  retl();
+  delayed()->nop();
+}
+
+
+void C1_MacroAssembler::explicit_null_check(Register base) {
+  Unimplemented();
+}
+
+
+void C1_MacroAssembler::build_frame(int frame_size_in_bytes) {
+
+  generate_stack_overflow_check(frame_size_in_bytes);
+  // Create the frame.
+  save_frame_c1(frame_size_in_bytes);
+}
+
+
+void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) {
+  if (C1Breakpoint) breakpoint_trap();
+  inline_cache_check(receiver, ic_klass);
+}
+
+
+void C1_MacroAssembler::verified_entry() {
+  if (C1Breakpoint) breakpoint_trap();
+  // build frame
+  verify_FPU(0, "method_entry");
+}
+
+
+void C1_MacroAssembler::lock_object(Register Rmark, Register Roop, Register Rbox, Register Rscratch, Label& slow_case) {
+  assert_different_registers(Rmark, Roop, Rbox, Rscratch);
+
+  Label done;
+
+  Address mark_addr(Roop, 0, oopDesc::mark_offset_in_bytes());
+
+  // The following move must be the first instruction of emitted since debug
+  // information may be generated for it.
+  // Load object header
+  ld_ptr(mark_addr, Rmark);
+
+  verify_oop(Roop);
+
+  // save object being locked into the BasicObjectLock
+  st_ptr(Roop, Rbox, BasicObjectLock::obj_offset_in_bytes());
+
+  if (UseBiasedLocking) {
+    biased_locking_enter(Roop, Rmark, Rscratch, done, &slow_case);
+  }
+
+  // Save Rbox in Rscratch to be used for the cas operation
+  mov(Rbox, Rscratch);
+
+  // and mark it unlocked
+  or3(Rmark, markOopDesc::unlocked_value, Rmark);
+
+  // save unlocked object header into the displaced header location on the stack
+  st_ptr(Rmark, Rbox, BasicLock::displaced_header_offset_in_bytes());
+
+  // compare object markOop with Rmark and if equal exchange Rscratch with object markOop
+  assert(mark_addr.disp() == 0, "cas must take a zero displacement");
+  casx_under_lock(mark_addr.base(), Rmark, Rscratch, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
+  // if compare/exchange succeeded we found an unlocked object and we now have locked it
+  // hence we are done
+  cmp(Rmark, Rscratch);
+  brx(Assembler::equal, false, Assembler::pt, done);
+  delayed()->sub(Rscratch, SP, Rscratch);  //pull next instruction into delay slot
+  // we did not find an unlocked object so see if this is a recursive case
+  // sub(Rscratch, SP, Rscratch);
+  assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
+  andcc(Rscratch, 0xfffff003, Rscratch);
+  brx(Assembler::notZero, false, Assembler::pn, slow_case);
+  delayed()->st_ptr(Rscratch, Rbox, BasicLock::displaced_header_offset_in_bytes());
+  bind(done);
+}
+
+
+void C1_MacroAssembler::unlock_object(Register Rmark, Register Roop, Register Rbox, Label& slow_case) {
+  assert_different_registers(Rmark, Roop, Rbox);
+
+  Label done;
+
+  Address mark_addr(Roop, 0, oopDesc::mark_offset_in_bytes());
+  assert(mark_addr.disp() == 0, "cas must take a zero displacement");
+
+  if (UseBiasedLocking) {
+    // load the object out of the BasicObjectLock
+    ld_ptr(Rbox, BasicObjectLock::obj_offset_in_bytes(), Roop);
+    verify_oop(Roop);
+    biased_locking_exit(mark_addr, Rmark, done);
+  }
+  // Test first it it is a fast recursive unlock
+  ld_ptr(Rbox, BasicLock::displaced_header_offset_in_bytes(), Rmark);
+  br_null(Rmark, false, Assembler::pt, done);
+  delayed()->nop();
+  if (!UseBiasedLocking) {
+    // load object
+    ld_ptr(Rbox, BasicObjectLock::obj_offset_in_bytes(), Roop);
+    verify_oop(Roop);
+  }
+
+  // Check if it is still a light weight lock, this is is true if we see
+  // the stack address of the basicLock in the markOop of the object
+  casx_under_lock(mark_addr.base(), Rbox, Rmark, (address)StubRoutines::Sparc::atomic_memory_operation_lock_addr());
+  cmp(Rbox, Rmark);
+
+  brx(Assembler::notEqual, false, Assembler::pn, slow_case);
+  delayed()->nop();
+  // Done
+  bind(done);
+}
+
+
+void C1_MacroAssembler::try_allocate(
+  Register obj,                        // result: pointer to object after successful allocation
+  Register var_size_in_bytes,          // object size in bytes if unknown at compile time; invalid otherwise
+  int      con_size_in_bytes,          // object size in bytes if   known at compile time
+  Register t1,                         // temp register
+  Register t2,                         // temp register
+  Label&   slow_case                   // continuation point if fast allocation fails
+) {
+  if (UseTLAB) {
+    tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
+  } else {
+    eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
+  }
+}
+
+
+void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
+  assert_different_registers(obj, klass, len, t1, t2);
+  if (UseBiasedLocking && !len->is_valid()) {
+    ld_ptr(klass, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes(), t1);
+  } else {
+    set((intx)markOopDesc::prototype(), t1);
+  }
+  st_ptr(t1  , obj, oopDesc::mark_offset_in_bytes       ());
+  st_ptr(klass, obj, oopDesc::klass_offset_in_bytes      ());
+  if (len->is_valid()) st(len  , obj, arrayOopDesc::length_offset_in_bytes());
+}
+
+
+void C1_MacroAssembler::initialize_body(Register base, Register index) {
+  assert_different_registers(base, index);
+  Label loop;
+  bind(loop);
+  subcc(index, HeapWordSize, index);
+  brx(Assembler::greaterEqual, true, Assembler::pt, loop);
+  delayed()->st_ptr(G0, base, index);
+}
+
+
+void C1_MacroAssembler::allocate_object(
+  Register obj,                        // result: pointer to object after successful allocation
+  Register t1,                         // temp register
+  Register t2,                         // temp register
+  Register t3,                         // temp register
+  int      hdr_size,                   // object header size in words
+  int      obj_size,                   // object size in words
+  Register klass,                      // object klass
+  Label&   slow_case                   // continuation point if fast allocation fails
+) {
+  assert_different_registers(obj, t1, t2, t3, klass);
+  assert(klass == G5, "must be G5");
+
+  // allocate space & initialize header
+  if (!is_simm13(obj_size * wordSize)) {
+    // would need to use extra register to load
+    // object size => go the slow case for now
+    br(Assembler::always, false, Assembler::pt, slow_case);
+    delayed()->nop();
+    return;
+  }
+  try_allocate(obj, noreg, obj_size * wordSize, t2, t3, slow_case);
+
+  initialize_object(obj, klass, noreg, obj_size * HeapWordSize, t1, t2);
+}
+
+void C1_MacroAssembler::initialize_object(
+  Register obj,                        // result: pointer to object after successful allocation
+  Register klass,                      // object klass
+  Register var_size_in_bytes,          // object size in bytes if unknown at compile time; invalid otherwise
+  int      con_size_in_bytes,          // object size in bytes if   known at compile time
+  Register t1,                         // temp register
+  Register t2                          // temp register
+  ) {
+  const int hdr_size_in_bytes = oopDesc::header_size_in_bytes();
+
+  initialize_header(obj, klass, noreg, t1, t2);
+
+#ifdef ASSERT
+  {
+    Label ok;
+    ld(klass, klassOopDesc::header_size() * HeapWordSize + Klass::layout_helper_offset_in_bytes(), t1);
+    if (var_size_in_bytes != noreg) {
+      cmp(t1, var_size_in_bytes);
+    } else {
+      cmp(t1, con_size_in_bytes);
+    }
+    brx(Assembler::equal, false, Assembler::pt, ok);
+    delayed()->nop();
+    stop("bad size in initialize_object");
+    should_not_reach_here();
+
+    bind(ok);
+  }
+
+#endif
+
+  // initialize body
+  const int threshold = 5 * HeapWordSize;              // approximate break even point for code size
+  if (var_size_in_bytes != noreg) {
+    // use a loop
+    add(obj, hdr_size_in_bytes, t1);               // compute address of first element
+    sub(var_size_in_bytes, hdr_size_in_bytes, t2); // compute size of body
+    initialize_body(t1, t2);
+#ifndef _LP64
+  } else if (VM_Version::v9_instructions_work() && con_size_in_bytes < threshold * 2) {
+    // on v9 we can do double word stores to fill twice as much space.
+    assert(hdr_size_in_bytes % 8 == 0, "double word aligned");
+    assert(con_size_in_bytes % 8 == 0, "double word aligned");
+    for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += 2 * HeapWordSize) stx(G0, obj, i);
+#endif
+  } else if (con_size_in_bytes <= threshold) {
+    // use explicit NULL stores
+    for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += HeapWordSize)     st_ptr(G0, obj, i);
+  } else if (con_size_in_bytes > hdr_size_in_bytes) {
+    // use a loop
+    const Register base  = t1;
+    const Register index = t2;
+    add(obj, hdr_size_in_bytes, base);               // compute address of first element
+    // compute index = number of words to clear
+    set(con_size_in_bytes - hdr_size_in_bytes, index);
+    initialize_body(base, index);
+  }
+
+  if (DTraceAllocProbes) {
+    assert(obj == O0, "must be");
+    call(CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)),
+         relocInfo::runtime_call_type);
+    delayed()->nop();
+  }
+
+  verify_oop(obj);
+}
+
+
+void C1_MacroAssembler::allocate_array(
+  Register obj,                        // result: pointer to array after successful allocation
+  Register len,                        // array length
+  Register t1,                         // temp register
+  Register t2,                         // temp register
+  Register t3,                         // temp register
+  int      hdr_size,                   // object header size in words
+  int      elt_size,                   // element size in bytes
+  Register klass,                      // object klass
+  Label&   slow_case                   // continuation point if fast allocation fails
+) {
+  assert_different_registers(obj, len, t1, t2, t3, klass);
+  assert(klass == G5, "must be G5");
+  assert(t1 == G1, "must be G1");
+
+  // determine alignment mask
+  assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
+
+  // check for negative or excessive length
+  // note: the maximum length allowed is chosen so that arrays of any
+  //       element size with this length are always smaller or equal
+  //       to the largest integer (i.e., array size computation will
+  //       not overflow)
+  set(max_array_allocation_length, t1);
+  cmp(len, t1);
+  br(Assembler::greaterUnsigned, false, Assembler::pn, slow_case);
+
+  // compute array size
+  // note: if 0 <= len <= max_length, len*elt_size + header + alignment is
+  //       smaller or equal to the largest integer; also, since top is always
+  //       aligned, we can do the alignment here instead of at the end address
+  //       computation
+  const Register arr_size = t1;
+  switch (elt_size) {
+    case  1: delayed()->mov(len,    arr_size); break;
+    case  2: delayed()->sll(len, 1, arr_size); break;
+    case  4: delayed()->sll(len, 2, arr_size); break;
+    case  8: delayed()->sll(len, 3, arr_size); break;
+    default: ShouldNotReachHere();
+  }
+  add(arr_size, hdr_size * wordSize + MinObjAlignmentInBytesMask, arr_size); // add space for header & alignment
+  and3(arr_size, ~MinObjAlignmentInBytesMask, arr_size);                     // align array size
+
+  // allocate space & initialize header
+  if (UseTLAB) {
+    tlab_allocate(obj, arr_size, 0, t2, slow_case);
+  } else {
+    eden_allocate(obj, arr_size, 0, t2, t3, slow_case);
+  }
+  initialize_header(obj, klass, len, t2, t3);
+
+  // initialize body
+  const Register base  = t2;
+  const Register index = t3;
+  add(obj, hdr_size * wordSize, base);               // compute address of first element
+  sub(arr_size, hdr_size * wordSize, index);         // compute index = number of words to clear
+  initialize_body(base, index);
+
+  if (DTraceAllocProbes) {
+    assert(obj == O0, "must be");
+    call(CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)),
+         relocInfo::runtime_call_type);
+    delayed()->nop();
+  }
+
+  verify_oop(obj);
+}
+
+
+#ifndef PRODUCT
+
+void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
+  if (!VerifyOops) return;
+  verify_oop_addr(Address(SP, 0, stack_offset + STACK_BIAS));
+}
+
+void C1_MacroAssembler::verify_not_null_oop(Register r) {
+  Label not_null;
+  br_zero(Assembler::notEqual, false, Assembler::pt, r, not_null);
+  delayed()->nop();
+  stop("non-null oop required");
+  bind(not_null);
+  if (!VerifyOops) return;
+  verify_oop(r);
+}
+
+void C1_MacroAssembler::invalidate_registers(bool iregisters, bool lregisters, bool oregisters,
+                                             Register preserve1, Register preserve2) {
+  if (iregisters) {
+    for (int i = 0; i < 6; i++) {
+      Register r = as_iRegister(i);
+      if (r != preserve1 && r != preserve2)  set(0xdead, r);
+    }
+  }
+  if (oregisters) {
+    for (int i = 0; i < 6; i++) {
+      Register r = as_oRegister(i);
+      if (r != preserve1 && r != preserve2)  set(0xdead, r);
+    }
+  }
+  if (lregisters) {
+    for (int i = 0; i < 8; i++) {
+      Register r = as_lRegister(i);
+      if (r != preserve1 && r != preserve2)  set(0xdead, r);
+    }
+  }
+}
+
+
+#endif