1 /*
   2  * Copyright (c) 1998, 2019, 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/interp_masm.hpp"
  28 #include "interpreter/interpreter.hpp"
  29 #include "interpreter/interpreterRuntime.hpp"
  30 #include "memory/allocation.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.inline.hpp"
  36 #include "runtime/signature.hpp"
  37 
  38 
  39 #define __ _masm->
  40 
  41 
  42 // Implementation of SignatureHandlerGenerator
  43 InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(
  44     const methodHandle& method, CodeBuffer* buffer) : NativeSignatureIterator(method) {
  45   _masm = new MacroAssembler(buffer);
  46 }
  47 
  48 void InterpreterRuntime::SignatureHandlerGenerator::pass_word(int size_of_arg, int offset_in_arg) {
  49   Argument  jni_arg(jni_offset() + offset_in_arg, false);
  50   Register     Rtmp = O0;
  51   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  52 
  53   __ store_argument(Rtmp, jni_arg);
  54 }
  55 
  56 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  57   Argument  jni_arg(jni_offset(), false);
  58   Register  Rtmp = O0;
  59 
  60   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  61   __ store_long_argument(Rtmp, jni_arg);
  62 }
  63 
  64 
  65 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  66   Argument  jni_arg(jni_offset(), false);
  67   FloatRegister  Rtmp = F0;
  68   __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
  69   __ store_float_argument(Rtmp, jni_arg);
  70 }
  71 
  72 
  73 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {
  74   Argument  jni_arg(jni_offset(), false);
  75   FloatRegister  Rtmp = F0;
  76   __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
  77   __ store_double_argument(Rtmp, jni_arg);
  78 }
  79 
  80 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  81   Argument  jni_arg(jni_offset(), false);
  82   Argument java_arg(    offset(), true);
  83   Register    Rtmp1 = O0;
  84   Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;
  85   Register    Rtmp3 =  G3_scratch;
  86 
  87   // the handle for a receiver will never be null
  88   bool do_NULL_check = offset() != 0 || is_static();
  89 
  90   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));
  91   __ ld_ptr(h_arg, Rtmp1);
  92   if (!do_NULL_check) {
  93     __ add(h_arg.base(), h_arg.disp(), Rtmp2);
  94   } else {
  95     if (Rtmp1 == Rtmp2)
  96           __ tst(Rtmp1);
  97     else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair
  98     Label L;
  99     __ brx(Assembler::notZero, true, Assembler::pt, L);
 100     __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);
 101     __ bind(L);
 102   }
 103   __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op
 104 }
 105 
 106 
 107 void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {
 108 
 109   // generate code to handle arguments
 110   iterate(fingerprint);
 111 
 112   // return result handler
 113   AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));
 114   __ sethi(result_handler, Lscratch);
 115   __ retl();
 116   __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);
 117 
 118   __ flush();
 119 }
 120 
 121 
 122 // Implementation of SignatureHandlerLibrary
 123 
 124 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 125 
 126 
 127 class SlowSignatureHandler: public NativeSignatureIterator {
 128  private:
 129   address   _from;
 130   intptr_t* _to;
 131   intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers
 132   uint      _argcount;
 133 
 134   enum {                                        // We need to differenciate float from non floats in reg args
 135     non_float  = 0,
 136     float_sig  = 1,
 137     double_sig = 2,
 138     long_sig   = 3
 139   };
 140 
 141   virtual void pass_int() {
 142     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 143     _from -= Interpreter::stackElementSize;
 144     add_signature( non_float );
 145   }
 146 
 147   virtual void pass_object() {
 148     // pass address of from
 149     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
 150     *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
 151     _from -= Interpreter::stackElementSize;
 152     add_signature( non_float );
 153    }
 154 
 155   virtual void pass_float()  {
 156     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 157     _from -= Interpreter::stackElementSize;
 158     add_signature( float_sig );
 159    }
 160 
 161   virtual void pass_double() {
 162     *_to++ = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 163     _from -= 2*Interpreter::stackElementSize;
 164    add_signature( double_sig );
 165    }
 166 
 167   virtual void pass_long() {
 168     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 169     _to += 1;
 170     _from -= 2*Interpreter::stackElementSize;
 171     add_signature( long_sig );
 172   }
 173 
 174   virtual void add_signature( intptr_t sig_type ) {
 175     if ( _argcount < (sizeof (intptr_t))*4 ) {
 176       *_RegArgSignature |= (sig_type << (_argcount*2) );
 177       _argcount++;
 178     }
 179   }
 180 
 181 
 182  public:
 183   SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {
 184     _from = from;
 185     _to   = to;
 186     _RegArgSignature = RegArgSig;
 187     *_RegArgSignature = 0;
 188     _argcount = method->is_static() ? 2 : 1;
 189   }
 190 };
 191 
 192 
 193 JRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(
 194                                                     JavaThread* thread,
 195                                                     Method* method,
 196                                                     intptr_t* from,
 197                                                     intptr_t* to ))
 198   methodHandle m(thread, method);
 199   assert(m->is_native(), "sanity check");
 200   // handle arguments
 201   // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature
 202   // back to the code that pops the arguments into the CPU registers
 203   SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate((uint64_t)CONST64(-1));
 204   // return result handler
 205   return Interpreter::result_handler(m->result_type());
 206 JRT_END