1 /*
   2  * Copyright (c) 1998, 2017, 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   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  57   __ store_long_argument(Rtmp, jni_arg);
  58 }
  59 
  60 
  61 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  62   Argument  jni_arg(jni_offset(), false);
  63   FloatRegister  Rtmp = F0;
  64   __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  65   __ store_float_argument(Rtmp, jni_arg);
  66 }
  67 
  68 
  69 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {
  70   Argument  jni_arg(jni_offset(), false);
  71   FloatRegister  Rtmp = F0;
  72   __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  73   __ store_double_argument(Rtmp, jni_arg);
  74 }
  75 
  76 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  77   Argument  jni_arg(jni_offset(), false);
  78   Argument java_arg(    offset(), true);
  79   Register    Rtmp1 = O0;
  80   Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;
  81   Register    Rtmp3 =  G3_scratch;
  82 
  83   // the handle for a receiver will never be null
  84   bool do_NULL_check = offset() != 0 || is_static();
  85 
  86   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));
  87   __ ld_ptr(h_arg, Rtmp1);
  88   if (!do_NULL_check) {
  89     __ add(h_arg.base(), h_arg.disp(), Rtmp2);
  90   } else {
  91     if (Rtmp1 == Rtmp2)
  92           __ tst(Rtmp1);
  93     else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair
  94     Label L;
  95     __ brx(Assembler::notZero, true, Assembler::pt, L);
  96     __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);
  97     __ bind(L);
  98   }
  99   __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op
 100 }
 101 
 102 
 103 void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {
 104 
 105   // generate code to handle arguments
 106   iterate(fingerprint);
 107 
 108   // return result handler
 109   AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));
 110   __ sethi(result_handler, Lscratch);
 111   __ retl();
 112   __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);
 113 
 114   __ flush();
 115 }
 116 
 117 
 118 // Implementation of SignatureHandlerLibrary
 119 
 120 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 121 
 122 
 123 class SlowSignatureHandler: public NativeSignatureIterator {
 124  private:
 125   address   _from;
 126   intptr_t* _to;
 127   intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers
 128   uint      _argcount;
 129 
 130   enum {                                        // We need to differenciate float from non floats in reg args
 131     non_float  = 0,
 132     float_sig  = 1,
 133     double_sig = 2,
 134     long_sig   = 3
 135   };
 136 
 137   virtual void pass_int() {
 138     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 139     _from -= Interpreter::stackElementSize;
 140     add_signature( non_float );
 141   }
 142 
 143   virtual void pass_object() {
 144     // pass address of from
 145     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
 146     *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
 147     _from -= Interpreter::stackElementSize;
 148     add_signature( non_float );
 149    }
 150 
 151   virtual void pass_float()  {
 152     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 153     _from -= Interpreter::stackElementSize;
 154     add_signature( float_sig );
 155    }
 156 
 157   virtual void pass_double() {
 158     *_to++ = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 159     _from -= 2*Interpreter::stackElementSize;
 160    add_signature( double_sig );
 161    }
 162 
 163   virtual void pass_long() {
 164     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 165     _to += 1;
 166     _from -= 2*Interpreter::stackElementSize;
 167     add_signature( long_sig );
 168   }
 169 
 170   virtual void add_signature( intptr_t sig_type ) {
 171     if ( _argcount < (sizeof (intptr_t))*4 ) {
 172       *_RegArgSignature |= (sig_type << (_argcount*2) );
 173       _argcount++;
 174     }
 175   }
 176 
 177 
 178  public:
 179   SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {
 180     _from = from;
 181     _to   = to;
 182     _RegArgSignature = RegArgSig;
 183     *_RegArgSignature = 0;
 184     _argcount = method->is_static() ? 2 : 1;
 185   }
 186 };
 187 
 188 
 189 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(
 190                                                     JavaThread* thread,
 191                                                     Method* method,
 192                                                     intptr_t* from,
 193                                                     intptr_t* to ))
 194   methodHandle m(thread, method);
 195   assert(m->is_native(), "sanity check");
 196   // handle arguments
 197   // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature
 198   // back to the code that pops the arguments into the CPU registers
 199   SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate((uint64_t)CONST64(-1));
 200   // return result handler
 201   return Interpreter::result_handler(m->result_type());
 202 IRT_END