1 /*
   2  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "asm/macroAssembler.inline.hpp"
  27 #include "interpreter/interpreter.hpp"
  28 #include "interpreter/interpreterRuntime.hpp"
  29 #include "memory/allocation.inline.hpp"
  30 #include "memory/universe.inline.hpp"
  31 #include "oops/method.hpp"
  32 #include "oops/oop.inline.hpp"
  33 #include "runtime/handles.inline.hpp"
  34 #include "runtime/icache.hpp"
  35 #include "runtime/interfaceSupport.hpp"
  36 #include "runtime/signature.hpp"
  37 
  38 
  39 #define __ _masm->
  40 
  41 
  42 // Implementation of SignatureHandlerGenerator
  43 
  44 void InterpreterRuntime::SignatureHandlerGenerator::pass_word(int size_of_arg, int offset_in_arg) {
  45   Argument  jni_arg(jni_offset() + offset_in_arg, false);
  46   Register     Rtmp = O0;
  47   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  48 
  49   __ store_argument(Rtmp, jni_arg);
  50 }
  51 
  52 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  53   Argument  jni_arg(jni_offset(), false);
  54   Register  Rtmp = O0;
  55 
  56 #ifdef _LP64
  57   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  58   __ store_long_argument(Rtmp, jni_arg);
  59 #else
  60   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  61   __ store_argument(Rtmp, jni_arg);
  62   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 0), Rtmp);
  63   Argument successor(jni_arg.successor());
  64   __ store_argument(Rtmp, successor);
  65 #endif
  66 }
  67 
  68 
  69 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  70   Argument  jni_arg(jni_offset(), false);
  71 #ifdef _LP64
  72   FloatRegister  Rtmp = F0;
  73   __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  74   __ store_float_argument(Rtmp, jni_arg);
  75 #else
  76   Register     Rtmp = O0;
  77   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  78   __ store_argument(Rtmp, jni_arg);
  79 #endif
  80 }
  81 
  82 
  83 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {
  84   Argument  jni_arg(jni_offset(), false);
  85 #ifdef _LP64
  86   FloatRegister  Rtmp = F0;
  87   __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  88   __ store_double_argument(Rtmp, jni_arg);
  89 #else
  90   Register  Rtmp = O0;
  91   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  92   __ store_argument(Rtmp, jni_arg);
  93   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  94   Argument successor(jni_arg.successor());
  95   __ store_argument(Rtmp, successor);
  96 #endif
  97 }
  98 
  99 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
 100   Argument  jni_arg(jni_offset(), false);
 101   Argument java_arg(    offset(), true);
 102   Register    Rtmp1 = O0;
 103   Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;
 104   Register    Rtmp3 =  G3_scratch;
 105 
 106   // the handle for a receiver will never be null
 107   bool do_NULL_check = offset() != 0 || is_static();
 108 
 109   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));
 110   __ ld_ptr(h_arg, Rtmp1);
 111   if (!do_NULL_check) {
 112     __ add(h_arg.base(), h_arg.disp(), Rtmp2);
 113   } else {
 114     if (Rtmp1 == Rtmp2)
 115           __ tst(Rtmp1);
 116     else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair
 117     Label L;
 118     __ brx(Assembler::notZero, true, Assembler::pt, L);
 119     __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);
 120     __ bind(L);
 121   }
 122   __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op
 123 }
 124 
 125 
 126 void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {
 127 
 128   // generate code to handle arguments
 129   iterate(fingerprint);
 130 
 131   // return result handler
 132   AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));
 133   __ sethi(result_handler, Lscratch);
 134   __ retl();
 135   __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);
 136 
 137   __ flush();
 138 }
 139 
 140 
 141 // Implementation of SignatureHandlerLibrary
 142 
 143 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 144 
 145 
 146 class SlowSignatureHandler: public NativeSignatureIterator {
 147  private:
 148   address   _from;
 149   intptr_t* _to;
 150   intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers
 151   uint      _argcount;
 152 
 153   enum {                                        // We need to differenciate float from non floats in reg args
 154     non_float  = 0,
 155     float_sig  = 1,
 156     double_sig = 2,
 157     long_sig   = 3
 158   };
 159 
 160   virtual void pass_int() {
 161     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 162     _from -= Interpreter::stackElementSize;
 163     add_signature( non_float );
 164   }
 165 
 166   virtual void pass_object() {
 167     // pass address of from
 168     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
 169     *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
 170     _from -= Interpreter::stackElementSize;
 171     add_signature( non_float );
 172    }
 173 
 174 #ifdef _LP64
 175   virtual void pass_float()  {
 176     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 177     _from -= Interpreter::stackElementSize;
 178     add_signature( float_sig );
 179    }
 180 
 181   virtual void pass_double() {
 182     *_to++ = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 183     _from -= 2*Interpreter::stackElementSize;
 184    add_signature( double_sig );
 185    }
 186 
 187   virtual void pass_long() {
 188     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 189     _to += 1;
 190     _from -= 2*Interpreter::stackElementSize;
 191     add_signature( long_sig );
 192   }
 193 #else
 194    // pass_double() is pass_long() and pass_float() only _LP64
 195   virtual void pass_long() {
 196     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 197     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
 198     _to += 2;
 199     _from -= 2*Interpreter::stackElementSize;
 200     add_signature( non_float );
 201   }
 202 
 203   virtual void pass_float() {
 204     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 205     _from -= Interpreter::stackElementSize;
 206     add_signature( non_float );
 207   }
 208 
 209 #endif // _LP64
 210 
 211   virtual void add_signature( intptr_t sig_type ) {
 212     if ( _argcount < (sizeof (intptr_t))*4 ) {
 213       *_RegArgSignature |= (sig_type << (_argcount*2) );
 214       _argcount++;
 215     }
 216   }
 217 
 218 
 219  public:
 220   SlowSignatureHandler(methodHandle method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {
 221     _from = from;
 222     _to   = to;
 223     _RegArgSignature = RegArgSig;
 224     *_RegArgSignature = 0;
 225     _argcount = method->is_static() ? 2 : 1;
 226   }
 227 };
 228 
 229 
 230 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(
 231                                                     JavaThread* thread,
 232                                                     Method* method,
 233                                                     intptr_t* from,
 234                                                     intptr_t* to ))
 235   methodHandle m(thread, method);
 236   assert(m->is_native(), "sanity check");
 237   // handle arguments
 238   // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature
 239   // back to the code that pops the arguments into the CPU registers
 240   SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate((uint64_t)CONST64(-1));
 241   // return result handler
 242   return Interpreter::result_handler(m->result_type());
 243 IRT_END