--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/s390/vm/c1_CodeStubs_s390.cpp	Thu Oct 13 14:49:34 2016 +0200
@@ -0,0 +1,497 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016 SAP SE. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "c1/c1_CodeStubs.hpp"
+#include "c1/c1_FrameMap.hpp"
+#include "c1/c1_LIRAssembler.hpp"
+#include "c1/c1_MacroAssembler.hpp"
+#include "c1/c1_Runtime1.hpp"
+#include "nativeInst_s390.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "utilities/macros.hpp"
+#include "vmreg_s390.inline.hpp"
+#if INCLUDE_ALL_GCS
+#include "gc/g1/g1SATBCardTableModRefBS.hpp"
+#endif // INCLUDE_ALL_GCS
+
+#define __ ce->masm()->
+#undef  CHECK_BAILOUT
+#define CHECK_BAILOUT() { if (ce->compilation()->bailed_out()) return; }
+
+RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
+                               bool throw_index_out_of_bounds_exception) :
+  _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception),
+  _index(index) {
+  assert(info != NULL, "must have info");
+  _info = new CodeEmitInfo(info);
+}
+
+void RangeCheckStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  if (_info->deoptimize_on_exception()) {
+    address a = Runtime1::entry_for (Runtime1::predicate_failed_trap_id);
+    ce->emit_call_c(a);
+    CHECK_BAILOUT();
+    ce->add_call_info_here(_info);
+    ce->verify_oop_map(_info);
+    debug_only(__ should_not_reach_here());
+    return;
+  }
+
+  // Pass the array index in Z_R1_scratch which is not managed by linear scan.
+  if (_index->is_cpu_register()) {
+    __ lgr_if_needed(Z_R1_scratch, _index->as_register());
+  } else {
+    __ load_const_optimized(Z_R1_scratch, _index->as_jint());
+  }
+
+  Runtime1::StubID stub_id;
+  if (_throw_index_out_of_bounds_exception) {
+    stub_id = Runtime1::throw_index_exception_id;
+  } else {
+    stub_id = Runtime1::throw_range_check_failed_id;
+  }
+  ce->emit_call_c(Runtime1::entry_for (stub_id));
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
+  _info = new CodeEmitInfo(info);
+}
+
+void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  address a = Runtime1::entry_for (Runtime1::predicate_failed_trap_id);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  Metadata *m = _method->as_constant_ptr()->as_metadata();
+  bool success = __ set_metadata_constant(m, Z_R1_scratch);
+  if (!success) {
+    ce->compilation()->bailout("const section overflow");
+    return;
+  }
+  ce->store_parameter(/*_method->as_register()*/ Z_R1_scratch, 1);
+  ce->store_parameter(_bci, 0);
+  ce->emit_call_c(Runtime1::entry_for (Runtime1::counter_overflow_id));
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+void DivByZeroStub::emit_code(LIR_Assembler* ce) {
+  if (_offset != -1) {
+    ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
+  }
+  __ bind(_entry);
+  ce->emit_call_c(Runtime1::entry_for (Runtime1::throw_div0_exception_id));
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
+  address a;
+  if (_info->deoptimize_on_exception()) {
+    // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
+    a = Runtime1::entry_for (Runtime1::predicate_failed_trap_id);
+  } else {
+    a = Runtime1::entry_for (Runtime1::throw_null_pointer_exception_id);
+  }
+
+  ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
+  __ bind(_entry);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+// Note: pass object in Z_R1_scratch
+void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  if (_obj->is_valid()) {
+    __ z_lgr(Z_R1_scratch, _obj->as_register()); // _obj contains the optional argument to the stub
+  }
+  address a = Runtime1::entry_for (_stub);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
+  _result = result;
+  _klass = klass;
+  _klass_reg = klass_reg;
+  _info = new CodeEmitInfo(info);
+  assert(stub_id == Runtime1::new_instance_id                 ||
+         stub_id == Runtime1::fast_new_instance_id            ||
+         stub_id == Runtime1::fast_new_instance_init_check_id,
+         "need new_instance id");
+  _stub_id = stub_id;
+}
+
+void NewInstanceStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  assert(_klass_reg->as_register() == Z_R11, "call target expects klass in Z_R11");
+  address a = Runtime1::entry_for (_stub_id);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == Z_R2, "callee returns result in Z_R2,");
+  __ z_brul(_continuation);
+}
+
+NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
+  _klass_reg = klass_reg;
+  _length = length;
+  _result = result;
+  _info = new CodeEmitInfo(info);
+}
+
+void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  assert(_klass_reg->as_register() == Z_R11, "call target expects klass in Z_R11");
+  __ lgr_if_needed(Z_R13, _length->as_register());
+  address a = Runtime1::entry_for (Runtime1::new_type_array_id);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == Z_R2, "callee returns result in Z_R2,");
+  __ z_brul(_continuation);
+}
+
+NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
+  _klass_reg = klass_reg;
+  _length = length;
+  _result = result;
+  _info = new CodeEmitInfo(info);
+}
+
+void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  assert(_klass_reg->as_register() == Z_R11, "call target expects klass in Z_R11");
+  __ lgr_if_needed(Z_R13, _length->as_register());
+  address a = Runtime1::entry_for (Runtime1::new_object_array_id);
+  ce->emit_call_c(a);
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == Z_R2, "callee returns result in Z_R2,");
+  __ z_brul(_continuation);
+}
+
+MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
+  : MonitorAccessStub(obj_reg, lock_reg) {
+  _info = new CodeEmitInfo(info);
+}
+
+void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  Runtime1::StubID enter_id;
+  if (ce->compilation()->has_fpu_code()) {
+    enter_id = Runtime1::monitorenter_id;
+  } else {
+    enter_id = Runtime1::monitorenter_nofpu_id;
+  }
+  __ lgr_if_needed(Z_R1_scratch, _obj_reg->as_register());
+  __ lgr_if_needed(Z_R13, _lock_reg->as_register()); // See LIRGenerator::syncTempOpr().
+  ce->emit_call_c(Runtime1::entry_for (enter_id));
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+void MonitorExitStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  // Move address of the BasicObjectLock into Z_R1_scratch.
+  if (_compute_lock) {
+    // Lock_reg was destroyed by fast unlocking attempt => recompute it.
+    ce->monitor_address(_monitor_ix, FrameMap::as_opr(Z_R1_scratch));
+  } else {
+    __ lgr_if_needed(Z_R1_scratch, _lock_reg->as_register());
+  }
+  // Note: non-blocking leaf routine => no call info needed.
+  Runtime1::StubID exit_id;
+  if (ce->compilation()->has_fpu_code()) {
+    exit_id = Runtime1::monitorexit_id;
+  } else {
+    exit_id = Runtime1::monitorexit_nofpu_id;
+  }
+  ce->emit_call_c(Runtime1::entry_for (exit_id));
+  CHECK_BAILOUT();
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+// Implementation of patching:
+// - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes).
+// - Replace original code with a call to the stub.
+// At Runtime:
+// - call to stub, jump to runtime.
+// - in runtime: Preserve all registers (especially objects, i.e., source and destination object).
+// - in runtime: After initializing class, restore original code, reexecute instruction.
+
+int PatchingStub::_patch_info_offset = - (12 /* load const */ + 2 /*BASR*/);
+
+void PatchingStub::align_patch_site(MacroAssembler* masm) {
+#ifndef PRODUCT
+  const char* bc;
+  switch (_id) {
+  case access_field_id: bc = "patch site (access_field)"; break;
+  case load_klass_id: bc = "patch site (load_klass)"; break;
+  case load_mirror_id: bc = "patch site (load_mirror)"; break;
+  case load_appendix_id: bc = "patch site (load_appendix)"; break;
+  default: bc = "patch site (unknown patch id)"; break;
+  }
+  masm->block_comment(bc);
+#endif
+
+  masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
+}
+
+void PatchingStub::emit_code(LIR_Assembler* ce) {
+  // Copy original code here.
+  assert(NativeGeneralJump::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
+         "not enough room for call");
+
+  NearLabel call_patch;
+
+  int being_initialized_entry = __ offset();
+
+  if (_id == load_klass_id) {
+    // Produce a copy of the load klass instruction for use by the case being initialized.
+#ifdef ASSERT
+    address start = __ pc();
+#endif
+    AddressLiteral addrlit((intptr_t)0, metadata_Relocation::spec(_index));
+    __ load_const(_obj, addrlit);
+
+#ifdef ASSERT
+    for (int i = 0; i < _bytes_to_copy; i++) {
+      address ptr = (address)(_pc_start + i);
+      int a_byte = (*ptr) & 0xFF;
+      assert(a_byte == *start++, "should be the same code");
+    }
+#endif
+  } else if (_id == load_mirror_id || _id == load_appendix_id) {
+    // Produce a copy of the load mirror instruction for use by the case being initialized.
+#ifdef ASSERT
+    address start = __ pc();
+#endif
+    AddressLiteral addrlit((intptr_t)0, oop_Relocation::spec(_index));
+    __ load_const(_obj, addrlit);
+
+#ifdef ASSERT
+    for (int i = 0; i < _bytes_to_copy; i++) {
+      address ptr = (address)(_pc_start + i);
+      int a_byte = (*ptr) & 0xFF;
+      assert(a_byte == *start++, "should be the same code");
+    }
+#endif
+  } else {
+    // Make a copy the code which is going to be patched.
+    for (int i = 0; i < _bytes_to_copy; i++) {
+      address ptr = (address)(_pc_start + i);
+      int a_byte = (*ptr) & 0xFF;
+      __ emit_int8 (a_byte);
+    }
+  }
+
+  address end_of_patch = __ pc();
+  int bytes_to_skip = 0;
+  if (_id == load_mirror_id) {
+    int offset = __ offset();
+    if (CommentedAssembly) {
+      __ block_comment(" being_initialized check");
+    }
+
+    // Static field accesses have special semantics while the class
+    // initializer is being run, so we emit a test which can be used to
+    // check that this code is being executed by the initializing
+    // thread.
+    assert(_obj != noreg, "must be a valid register");
+    assert(_index >= 0, "must have oop index");
+    __ z_lg(Z_R1_scratch, java_lang_Class::klass_offset_in_bytes(), _obj);
+    __ z_cg(Z_thread, Address(Z_R1_scratch, InstanceKlass::init_thread_offset()));
+    __ branch_optimized(Assembler::bcondNotEqual, call_patch);
+
+    // Load_klass patches may execute the patched code before it's
+    // copied back into place so we need to jump back into the main
+    // code of the nmethod to continue execution.
+    __ branch_optimized(Assembler::bcondAlways, _patch_site_continuation);
+
+    // Make sure this extra code gets skipped.
+    bytes_to_skip += __ offset() - offset;
+  }
+
+  // Now emit the patch record telling the runtime how to find the
+  // pieces of the patch. We only need 3 bytes but to help the disassembler
+  // we make the data look like a the following add instruction:
+  //   A R1, D2(X2, B2)
+  // which requires 4 bytes.
+  int sizeof_patch_record = 4;
+  bytes_to_skip += sizeof_patch_record;
+
+  // Emit the offsets needed to find the code to patch.
+  int being_initialized_entry_offset = __ offset() - being_initialized_entry + sizeof_patch_record;
+
+  // Emit the patch record: opcode of the add followed by 3 bytes patch record data.
+  __ emit_int8((int8_t)(A_ZOPC>>24));
+  __ emit_int8(being_initialized_entry_offset);
+  __ emit_int8(bytes_to_skip);
+  __ emit_int8(_bytes_to_copy);
+  address patch_info_pc = __ pc();
+  assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
+
+  address entry = __ pc();
+  NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
+  address target = NULL;
+  relocInfo::relocType reloc_type = relocInfo::none;
+  switch (_id) {
+    case access_field_id:  target = Runtime1::entry_for (Runtime1::access_field_patching_id); break;
+    case load_klass_id:    target = Runtime1::entry_for (Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
+    case load_mirror_id:   target = Runtime1::entry_for (Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
+    case load_appendix_id: target = Runtime1::entry_for (Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
+    default: ShouldNotReachHere();
+  }
+  __ bind(call_patch);
+
+  if (CommentedAssembly) {
+    __ block_comment("patch entry point");
+  }
+  // Cannot use call_c_opt() because its size is not constant.
+  __ load_const(Z_R1_scratch, target); // Must not optimize in order to keep constant _patch_info_offset constant.
+  __ z_basr(Z_R14, Z_R1_scratch);
+  assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
+  ce->add_call_info_here(_info);
+  __ z_brcl(Assembler::bcondAlways, _patch_site_entry);
+  if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
+    CodeSection* cs = __ code_section();
+    address pc = (address)_pc_start;
+    RelocIterator iter(cs, pc, pc + 1);
+    relocInfo::change_reloc_info_for_address(&iter, (address) pc, reloc_type, relocInfo::none);
+  }
+}
+
+void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  __ load_const_optimized(Z_R1_scratch, _trap_request); // Pass trap request in Z_R1_scratch.
+  ce->emit_call_c(Runtime1::entry_for (Runtime1::deoptimize_id));
+  CHECK_BAILOUT();
+  ce->add_call_info_here(_info);
+  DEBUG_ONLY(__ should_not_reach_here());
+}
+
+void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
+  // Slow case: call to native.
+  __ bind(_entry);
+  __ lgr_if_needed(Z_ARG1, src()->as_register());
+  __ lgr_if_needed(Z_ARG2, src_pos()->as_register());
+  __ lgr_if_needed(Z_ARG3, dst()->as_register());
+  __ lgr_if_needed(Z_ARG4, dst_pos()->as_register());
+  __ lgr_if_needed(Z_ARG5, length()->as_register());
+
+  // Must align calls sites, otherwise they can't be updated atomically on MP hardware.
+  ce->align_call(lir_static_call);
+
+  assert((__ offset() + NativeCall::call_far_pcrelative_displacement_offset) % NativeCall::call_far_pcrelative_displacement_alignment == 0,
+         "must be aligned");
+
+  ce->emit_static_call_stub();
+
+  // Prepend each BRASL with a nop.
+  __ relocate(relocInfo::static_call_type);
+  __ z_nop();
+  __ z_brasl(Z_R14, SharedRuntime::get_resolve_static_call_stub());
+  ce->add_call_info_here(info());
+  ce->verify_oop_map(info());
+
+#ifndef PRODUCT
+  __ load_const_optimized(Z_R1_scratch, (address)&Runtime1::_arraycopy_slowcase_cnt);
+  __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
+#endif
+
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+
+///////////////////////////////////////////////////////////////////////////////////
+#if INCLUDE_ALL_GCS
+
+void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
+  // At this point we know that marking is in progress.
+  // If do_load() is true then we have to emit the
+  // load of the previous value; otherwise it has already
+  // been loaded into _pre_val.
+  __ bind(_entry);
+  ce->check_reserved_argument_area(16); // RT stub needs 2 spill slots.
+  assert(pre_val()->is_register(), "Precondition.");
+
+  Register pre_val_reg = pre_val()->as_register();
+
+  if (do_load()) {
+    ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
+  }
+
+  __ z_ltgr(Z_R1_scratch, pre_val_reg); // Pass oop in Z_R1_scratch to Runtime1::g1_pre_barrier_slow_id.
+  __ branch_optimized(Assembler::bcondZero, _continuation);
+  ce->emit_call_c(Runtime1::entry_for (Runtime1::g1_pre_barrier_slow_id));
+  CHECK_BAILOUT();
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  ce->check_reserved_argument_area(16); // RT stub needs 2 spill slots.
+  assert(addr()->is_register(), "Precondition.");
+  assert(new_val()->is_register(), "Precondition.");
+  Register new_val_reg = new_val()->as_register();
+  __ z_ltgr(new_val_reg, new_val_reg);
+  __ branch_optimized(Assembler::bcondZero, _continuation);
+  __ z_lgr(Z_R1_scratch, addr()->as_pointer_register());
+  ce->emit_call_c(Runtime1::entry_for (Runtime1::g1_post_barrier_slow_id));
+  CHECK_BAILOUT();
+  __ branch_optimized(Assembler::bcondAlways, _continuation);
+}
+
+#endif // INCLUDE_ALL_GCS
+
+#undef __