1 /*
   2  * Copyright (c) 1998, 2018, 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 "interpreter/interpreter.hpp"
  27 #include "interpreter/interpreterRuntime.hpp"
  28 #include "memory/allocation.inline.hpp"
  29 #include "memory/universe.hpp"
  30 #include "oops/method.hpp"
  31 #include "oops/oop.inline.hpp"
  32 #include "runtime/handles.inline.hpp"
  33 #include "runtime/icache.hpp"
  34 #include "runtime/interfaceSupport.hpp"
  35 #include "runtime/signature.hpp"
  36 
  37 
  38 #define __ _masm->
  39 
  40 
  41 // Implementation of SignatureHandlerGenerator
  42 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {
  43   move(offset(), jni_offset() + 1);
  44 }
  45 
  46 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  47   move(offset(), jni_offset() + 1);
  48 }
  49 
  50 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  51    move(offset(), jni_offset() + 2);
  52    move(offset() + 1, jni_offset() + 1);
  53 }
  54 
  55 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  56   box (offset(), jni_offset() + 1);
  57 }
  58 
  59 void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {
  60   __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  61   __ movl(Address(to(), to_offset * wordSize), temp());
  62 }
  63 
  64 
  65 void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {
  66   __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  67   __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), (int32_t)NULL_WORD); // do not use temp() to avoid AGI
  68   Label L;
  69   __ jcc(Assembler::notZero, L);
  70   __ movptr(temp(), NULL_WORD);
  71   __ bind(L);
  72   __ movptr(Address(to(), to_offset * wordSize), temp());
  73 }
  74 
  75 
  76 void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) {
  77   // generate code to handle arguments
  78   iterate(fingerprint);
  79   // return result handler
  80   __ lea(rax,
  81          ExternalAddress((address)Interpreter::result_handler(method()->result_type())));
  82   // return
  83   __ ret(0);
  84   __ flush();
  85 }
  86 
  87 
  88 Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return rdi; }
  89 Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return rsp; }
  90 Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return rcx; }
  91 
  92 
  93 // Implementation of SignatureHandlerLibrary
  94 
  95 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
  96 
  97 class SlowSignatureHandler: public NativeSignatureIterator {
  98  private:
  99   address   _from;
 100   intptr_t* _to;
 101 
 102   virtual void pass_int() {
 103     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 104     _from -= Interpreter::stackElementSize;
 105   }
 106 
 107   virtual void pass_float() {
 108     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 109     _from -= Interpreter::stackElementSize;
 110   }
 111 
 112   virtual void pass_long() {
 113     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 114     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
 115     _to += 2;
 116     _from -= 2*Interpreter::stackElementSize;
 117   }
 118 
 119   virtual void pass_object() {
 120     // pass address of from
 121     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
 122     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
 123     _from -= Interpreter::stackElementSize;
 124    }
 125 
 126  public:
 127   SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to) :
 128     NativeSignatureIterator(method) {
 129     _from = from;
 130     _to   = to + (is_static() ? 2 : 1);
 131   }
 132 };
 133 
 134 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* thread, Method* method, intptr_t* from, intptr_t* to))
 135   methodHandle m(thread, (Method*)method);
 136   assert(m->is_native(), "sanity check");
 137   // handle arguments
 138   SlowSignatureHandler(m, (address)from, to + 1).iterate((uint64_t)CONST64(-1));
 139   // return result handler
 140   return Interpreter::result_handler(m->result_type());
 141 IRT_END