1 /*
   2  * Copyright 1998-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_interpreterRT_x86_32.cpp.incl"
  27 
  28 
  29 #define __ _masm->
  30 
  31 
  32 // Implementation of SignatureHandlerGenerator
  33 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {
  34   move(offset(), jni_offset() + 1);
  35 }
  36 
  37 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
  38    move(offset(), jni_offset() + 2);
  39    move(offset() + 1, jni_offset() + 1);
  40 }
  41 
  42 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
  43   box (offset(), jni_offset() + 1);
  44 }
  45 
  46 void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {
  47   __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  48   __ movl(Address(to(), to_offset * wordSize), temp());
  49 }
  50 
  51 
  52 void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {
  53   __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
  54   __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), (int32_t)NULL_WORD); // do not use temp() to avoid AGI
  55   Label L;
  56   __ jcc(Assembler::notZero, L);
  57   __ movptr(temp(), ((int32_t)NULL_WORD));
  58   __ bind(L);
  59   __ movptr(Address(to(), to_offset * wordSize), temp());
  60 }
  61 
  62 
  63 void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) {
  64   // generate code to handle arguments
  65   iterate(fingerprint);
  66   // return result handler
  67   __ lea(rax,
  68          ExternalAddress((address)Interpreter::result_handler(method()->result_type())));
  69   // return
  70   __ ret(0);
  71   __ flush();
  72 }
  73 
  74 
  75 Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return rdi; }
  76 Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return rsp; }
  77 Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return rcx; }
  78 
  79 
  80 // Implementation of SignatureHandlerLibrary
  81 
  82 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
  83 
  84 class SlowSignatureHandler: public NativeSignatureIterator {
  85  private:
  86   address   _from;
  87   intptr_t* _to;
  88 
  89 #ifdef ASSERT
  90   void verify_tag(frame::Tag t) {
  91     assert(!TaggedStackInterpreter ||
  92            *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag");
  93   }
  94 #endif // ASSERT
  95 
  96   virtual void pass_int() {
  97     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
  98     debug_only(verify_tag(frame::TagValue));
  99     _from -= Interpreter::stackElementSize();
 100   }
 101 
 102   virtual void pass_long() {
 103     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
 104     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
 105     debug_only(verify_tag(frame::TagValue));
 106     _to += 2;
 107     _from -= 2*Interpreter::stackElementSize();
 108   }
 109 
 110   virtual void pass_object() {
 111     // pass address of from
 112     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
 113     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL : from_addr;
 114     debug_only(verify_tag(frame::TagReference));
 115     _from -= Interpreter::stackElementSize();
 116    }
 117 
 118  public:
 119   SlowSignatureHandler(methodHandle method, address from, intptr_t* to) :
 120     NativeSignatureIterator(method) {
 121     _from = from;
 122     _to   = to + (is_static() ? 2 : 1);
 123   }
 124 };
 125 
 126 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* thread, methodOopDesc* method, intptr_t* from, intptr_t* to))
 127   methodHandle m(thread, (methodOop)method);
 128   assert(m->is_native(), "sanity check");
 129   // handle arguments
 130   SlowSignatureHandler(m, (address)from, to + 1).iterate(UCONST64(-1));
 131   // return result handler
 132   return Interpreter::result_handler(m->result_type());
 133 IRT_END