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 "oops/method.hpp"
  31 #include "oops/oop.inline.hpp"
  32 #include "runtime/handles.inline.hpp"
  33 #include "runtime/icache.hpp"
  34 #include "runtime/interfaceSupport.inline.hpp"
  35 #include "runtime/signature.hpp"
  36 
  37 
  38 #define __ _masm->
  39 
  40 
  41 // Implementation of SignatureHandlerGenerator
  42 InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(const methodHandle& method, CodeBuffer* buffer) :
  43     NativeSignatureIterator(method) {
  44   _masm = new MacroAssembler(buffer);
  45 #ifdef AMD64
  46 #ifdef _WIN64
  47   _num_args = (method->is_static() ? 1 : 0);
  48   _stack_offset = (Argument::n_int_register_parameters_c+1)* wordSize; // don't overwrite return address
  49 #else
  50   _num_int_args = (method->is_static() ? 1 : 0);
  51   _num_fp_args = 0;
  52   _stack_offset = wordSize; // don't overwrite return address
  53 #endif // _WIN64
  54 #endif // AMD64
  55 }
  56 
  57 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {
  58   move(offset(), jni_offset() + 1);
  59 }
  60 
  61 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
  62   move(offset(), jni_offset() + 1);
  63 }
  64 
  65 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  66    move(offset(), jni_offset() + 2);
  67    move(offset() + 1, jni_offset() + 1);
  68 }
  69 
  70 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  71   box (offset(), jni_offset() + 1);
  72 }
  73 
  74 void InterpreterRuntime::SignatureHandlerGenerator::pass_valuetype() {
  75   box (offset(), jni_offset() + 1);
  76 }
  77 
  78 void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {
  79   __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  80   __ movl(Address(to(), to_offset * wordSize), temp());
  81 }
  82 
  83 
  84 void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {
  85   __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  86   __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), (int32_t)NULL_WORD); // do not use temp() to avoid AGI
  87   Label L;
  88   __ jcc(Assembler::notZero, L);
  89   __ movptr(temp(), NULL_WORD);
  90   __ bind(L);
  91   __ movptr(Address(to(), to_offset * wordSize), temp());
  92 }
  93 
  94 
  95 void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) {
  96   // generate code to handle arguments
  97   iterate(fingerprint);
  98   // return result handler
  99   __ lea(rax,
 100          ExternalAddress((address)Interpreter::result_handler(method()->result_type())));
 101   // return
 102   __ ret(0);
 103   __ flush();
 104 }
 105 
 106 
 107 Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return rdi; }
 108 Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return rsp; }
 109 Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return rcx; }
 110 
 111 
 112 // Implementation of SignatureHandlerLibrary
 113 
 114 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 115 
 116 class SlowSignatureHandler: public NativeSignatureIterator {
 117  private:
 118   address   _from;
 119   intptr_t* _to;
 120 
 121   virtual void pass_int() {
 122     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 123     _from -= Interpreter::stackElementSize;
 124   }
 125 
 126   virtual void pass_float() {
 127     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
 128     _from -= Interpreter::stackElementSize;
 129   }
 130 
 131   virtual void pass_long() {
 132     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 133     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
 134     _to += 2;
 135     _from -= 2*Interpreter::stackElementSize;
 136   }
 137 
 138   virtual void pass_object() {
 139     // pass address of from
 140     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
 141     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
 142     _from -= Interpreter::stackElementSize;
 143    }
 144 
 145   virtual void pass_valuetype() {
 146     // pass address of from
 147     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
 148     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
 149     _from -= Interpreter::stackElementSize;
 150    }
 151 
 152  public:
 153   SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to) :
 154     NativeSignatureIterator(method) {
 155     _from = from;
 156     _to   = to + (is_static() ? 2 : 1);
 157   }
 158 };
 159 
 160 JRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* thread, Method* method, intptr_t* from, intptr_t* to))
 161   methodHandle m(thread, (Method*)method);
 162   assert(m->is_native(), "sanity check");
 163   // handle arguments
 164   SlowSignatureHandler(m, (address)from, to + 1).iterate((uint64_t)CONST64(-1));
 165   // return result handler
 166   return Interpreter::result_handler(m->result_type());
 167 JRT_END