--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/x86/vm/c1_CodeStubs_x86.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,459 @@
+/*
+ * Copyright 1999-2006 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_CodeStubs_x86.cpp.incl"
+
+
+#define __ ce->masm()->
+
+float ConversionStub::float_zero = 0.0;
+double ConversionStub::double_zero = 0.0;
+
+void ConversionStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
+
+
+  if (input()->is_single_xmm()) {
+    __ comiss(input()->as_xmm_float_reg(),
+              ExternalAddress((address)&float_zero));
+  } else if (input()->is_double_xmm()) {
+    __ comisd(input()->as_xmm_double_reg(),
+              ExternalAddress((address)&double_zero));
+  } else {
+    __ pushl(rax);
+    __ ftst();
+    __ fnstsw_ax();
+    __ sahf();
+    __ popl(rax);
+  }
+
+  Label NaN, do_return;
+  __ jccb(Assembler::parity, NaN);
+  __ jccb(Assembler::below, do_return);
+
+  // input is > 0 -> return maxInt
+  // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
+  __ decrement(result()->as_register());
+  __ jmpb(do_return);
+
+  // input is NaN -> return 0
+  __ bind(NaN);
+  __ xorl(result()->as_register(), result()->as_register());
+
+  __ bind(do_return);
+  __ jmp(_continuation);
+}
+
+#ifdef TIERED
+void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  ce->store_parameter(_bci, 0);
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+
+  __ jmp(_continuation);
+}
+#endif // TIERED
+
+
+
+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)
+{
+  _info = info == NULL ? NULL : new CodeEmitInfo(info);
+}
+
+
+void RangeCheckStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  // pass the array index on stack because all registers must be preserved
+  if (_index->is_cpu_register()) {
+    ce->store_parameter(_index->as_register(), 0);
+  } else {
+    ce->store_parameter(_index->as_jint(), 0);
+  }
+  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;
+  }
+  __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+
+void DivByZeroStub::emit_code(LIR_Assembler* ce) {
+  if (_offset != -1) {
+    ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
+  }
+  __ bind(_entry);
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+
+// Implementation of NewInstanceStub
+
+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) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  __ movl(rdx, _klass_reg->as_register());
+  __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == rax, "result must in rax,");
+  __ jmp(_continuation);
+}
+
+
+// Implementation of NewTypeArrayStub
+
+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) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  assert(_length->as_register() == rbx, "length must in rbx,");
+  assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == rax, "result must in rax,");
+  __ jmp(_continuation);
+}
+
+
+// Implementation of NewObjectArrayStub
+
+NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
+  _klass_reg = klass_reg;
+  _result = result;
+  _length = length;
+  _info = new CodeEmitInfo(info);
+}
+
+
+void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  assert(_length->as_register() == rbx, "length must in rbx,");
+  assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  assert(_result->as_register() == rax, "result must in rax,");
+  __ jmp(_continuation);
+}
+
+
+// Implementation of MonitorAccessStubs
+
+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) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  ce->store_parameter(_obj_reg->as_register(),  1);
+  ce->store_parameter(_lock_reg->as_register(), 0);
+  Runtime1::StubID enter_id;
+  if (ce->compilation()->has_fpu_code()) {
+    enter_id = Runtime1::monitorenter_id;
+  } else {
+    enter_id = Runtime1::monitorenter_nofpu_id;
+  }
+  __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
+  ce->add_call_info_here(_info);
+  ce->verify_oop_map(_info);
+  __ jmp(_continuation);
+}
+
+
+void MonitorExitStub::emit_code(LIR_Assembler* ce) {
+  __ bind(_entry);
+  if (_compute_lock) {
+    // lock_reg was destroyed by fast unlocking attempt => recompute it
+    ce->monitor_address(_monitor_ix, _lock_reg);
+  }
+  ce->store_parameter(_lock_reg->as_register(), 0);
+  // 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;
+  }
+  __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
+  __ jmp(_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 (rspecially objects, i.e., source and destination object)
+// - in runtime: after initializing class, restore original code, reexecute instruction
+
+int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
+
+void PatchingStub::align_patch_site(MacroAssembler* masm) {
+  // We're patching a 5-7 byte instruction on intel and we need to
+  // make sure that we don't see a piece of the instruction.  It
+  // appears mostly impossible on Intel to simply invalidate other
+  // processors caches and since they may do aggressive prefetch it's
+  // very hard to make a guess about what code might be in the icache.
+  // Force the instruction to be double word aligned so that it
+  // doesn't span a cache line.
+  masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
+}
+
+void PatchingStub::emit_code(LIR_Assembler* ce) {
+  assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
+
+  Label call_patch;
+
+  // 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.
+  address being_initialized_entry = __ pc();
+  if (CommentedAssembly) {
+    __ block_comment(" patch template");
+  }
+  if (_id == load_klass_id) {
+    // produce a copy of the load klass instruction for use by the being initialized case
+    address start = __ pc();
+    jobject o = NULL;
+    __ movoop(_obj, o);
+#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;
+      __ a_byte (a_byte);
+      *ptr = 0x90; // make the site look like a nop
+    }
+  }
+
+  address end_of_patch = __ pc();
+  int bytes_to_skip = 0;
+  if (_id == load_klass_id) {
+    int offset = __ offset();
+    if (CommentedAssembly) {
+      __ block_comment(" being_initialized check");
+    }
+    assert(_obj != noreg, "must be a valid register");
+    Register tmp = rax;
+    if (_obj == tmp) tmp = rbx;
+    __ pushl(tmp);
+    __ get_thread(tmp);
+    __ cmpl(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
+    __ popl(tmp);
+    __ jcc(Assembler::notEqual, call_patch);
+
+    // access_field 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.
+    __ jmp(_patch_site_continuation);
+
+    // make sure this extra code gets skipped
+    bytes_to_skip += __ offset() - offset;
+  }
+  if (CommentedAssembly) {
+    __ block_comment("patch data encoded as movl");
+  }
+  // Now emit the patch record telling the runtime how to find the
+  // pieces of the patch.  We only need 3 bytes but for readability of
+  // the disassembly we make the data look like a movl reg, imm32,
+  // which requires 5 bytes
+  int sizeof_patch_record = 5;
+  bytes_to_skip += sizeof_patch_record;
+
+  // emit the offsets needed to find the code to patch
+  int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
+
+  __ a_byte(0xB8);
+  __ a_byte(0);
+  __ a_byte(being_initialized_entry_offset);
+  __ a_byte(bytes_to_skip);
+  __ a_byte(_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;
+  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); break;
+    default: ShouldNotReachHere();
+  }
+  __ bind(call_patch);
+
+  if (CommentedAssembly) {
+    __ block_comment("patch entry point");
+  }
+  __ call(RuntimeAddress(target));
+  assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
+  ce->add_call_info_here(_info);
+  int jmp_off = __ offset();
+  __ jmp(_patch_site_entry);
+  // Add enough nops so deoptimization can overwrite the jmp above with a call
+  // and not destroy the world.
+  for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
+    __ nop();
+  }
+  if (_id == load_klass_id) {
+    CodeSection* cs = __ code_section();
+    RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
+    relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
+  }
+}
+
+
+void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
+  ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
+  __ bind(_entry);
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+
+void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+
+  __ bind(_entry);
+  // pass the object on stack because all registers must be preserved
+  if (_obj->is_cpu_register()) {
+    ce->store_parameter(_obj->as_register(), 0);
+  }
+  __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
+  ce->add_call_info_here(_info);
+  debug_only(__ should_not_reach_here());
+}
+
+
+ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):
+  _info(info) {
+}
+
+
+void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {
+  assert(__ rsp_offset() == 0, "frame size should be fixed");
+  __ bind(_entry);
+  __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));
+  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);
+  // Figure out where the args should go
+  // This should really convert the IntrinsicID to the methodOop and signature
+  // but I don't know how to do that.
+  //
+  VMRegPair args[5];
+  BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
+  SharedRuntime::java_calling_convention(signature, args, 5, true);
+
+  // push parameters
+  // (src, src_pos, dest, destPos, length)
+  Register r[5];
+  r[0] = src()->as_register();
+  r[1] = src_pos()->as_register();
+  r[2] = dst()->as_register();
+  r[3] = dst_pos()->as_register();
+  r[4] = length()->as_register();
+
+  // next registers will get stored on the stack
+  for (int i = 0; i < 5 ; i++ ) {
+    VMReg r_1 = args[i].first();
+    if (r_1->is_stack()) {
+      int st_off = r_1->reg2stack() * wordSize;
+      __ movl (Address(rsp, st_off), r[i]);
+    } else {
+      assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
+    }
+  }
+
+  ce->align_call(lir_static_call);
+
+  ce->emit_static_call_stub();
+  AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
+                         relocInfo::static_call_type);
+  __ call(resolve);
+  ce->add_call_info_here(info());
+
+#ifndef PRODUCT
+  __ increment(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
+#endif
+
+  __ jmp(_continuation);
+}
+
+
+#undef __