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 "interpreter/interp_masm.hpp"
  27 #include "interpreter/interpreter.hpp"
  28 #include "interpreter/interpreterRuntime.hpp"
  29 #include "memory/allocation.inline.hpp"
  30 #include "memory/universe.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(const methodHandle& method, CodeBuffer* buffer) :
  44     NativeSignatureIterator(method) {
  45   _masm = new MacroAssembler(buffer);
  46 #ifdef AMD64
  47 #ifdef _WIN64
  48   _num_args = (method->is_static() ? 1 : 0);
  49   _stack_offset = (Argument::n_int_register_parameters_c+1)* wordSize; // don't overwrite return address
  50 #else
  51   _num_int_args = (method->is_static() ? 1 : 0);
  52   _num_fp_args = 0;
  53   _stack_offset = wordSize; // don't overwrite return address
  54 #endif // _WIN64
  55 #endif // AMD64
  56 }
  57 
  58 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {
  59   move(offset(), jni_offset() + 1);
  60 }
  61 
  62 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  63   move(offset(), jni_offset() + 1);
  64 }
  65 
  66 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  67    move(offset(), jni_offset() + 2);
  68    move(offset() + 1, jni_offset() + 1);
  69 }
  70 
  71 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  72   box (offset(), jni_offset() + 1);
  73 }
  74 
  75 void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {
  76   __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  77   __ movl(Address(to(), to_offset * wordSize), temp());
  78 }
  79 
  80 
  81 void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {
  82   __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  83   __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), (int32_t)NULL_WORD); // do not use temp() to avoid AGI
  84   Label L;
  85   __ jcc(Assembler::notZero, L);
  86   __ movptr(temp(), NULL_WORD);
  87   __ bind(L);
  88   __ movptr(Address(to(), to_offset * wordSize), temp());
  89 }
  90 
  91 
  92 void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) {
  93   // generate code to handle arguments
  94   iterate(fingerprint);
  95   // return result handler
  96   __ lea(rax,
  97          ExternalAddress((address)Interpreter::result_handler(method()->result_type())));
  98   // return
  99   __ ret(0);
 100   __ flush();
 101 }
 102 
 103 
 104 Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return rdi; }
 105 Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return rsp; }
 106 Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return rcx; }
 107 
 108 
 109 // Implementation of SignatureHandlerLibrary
 110 
 111 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 112 
 113 class SlowSignatureHandler: public NativeSignatureIterator {
 114  private:
 115   address   _from;
 116   intptr_t* _to;
 117 
 118   virtual void pass_int() {
 119     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 120     _from -= Interpreter::stackElementSize;
 121   }
 122 
 123   virtual void pass_float() {
 124     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 125     _from -= Interpreter::stackElementSize;
 126   }
 127 
 128   virtual void pass_long() {
 129     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 130     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
 131     _to += 2;
 132     _from -= 2*Interpreter::stackElementSize;
 133   }
 134 
 135   virtual void pass_object() {
 136     // pass address of from
 137     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
 138     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
 139     _from -= Interpreter::stackElementSize;
 140    }
 141 
 142  public:
 143   SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to) :
 144     NativeSignatureIterator(method) {
 145     _from = from;
 146     _to   = to + (is_static() ? 2 : 1);
 147   }
 148 };
 149 
 150 JRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* thread, Method* method, intptr_t* from, intptr_t* to))
 151   methodHandle m(thread, (Method*)method);
 152   assert(m->is_native(), "sanity check");
 153   // handle arguments
 154   SlowSignatureHandler(m, (address)from, to + 1).iterate((uint64_t)CONST64(-1));
 155   // return result handler
 156   return Interpreter::result_handler(m->result_type());
 157 JRT_END