jdk

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/*
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 * Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "interpreter/interp_masm.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/interpreterRuntime.hpp"
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#include "memory/allocation.inline.hpp"
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#include "oops/method.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/icache.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/signature.hpp"
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#define __ _masm->
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// Implementation of SignatureHandlerGenerator
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InterpreterRuntime::SignatureHandlerGenerator::SignatureHandlerGenerator(const methodHandle& method, CodeBuffer* buffer) :
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    NativeSignatureIterator(method) {
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  _masm = new MacroAssembler(buffer);
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#ifdef AMD64
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#ifdef _WIN64
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  _num_args = (method->is_static() ? 1 : 0);
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  _stack_offset = (Argument::n_int_register_parameters_c+1)* wordSize; // don't overwrite return address
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#else
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  _num_int_args = (method->is_static() ? 1 : 0);
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  _num_fp_args = 0;
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  _stack_offset = wordSize; // don't overwrite return address
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#endif // _WIN64
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#endif // AMD64
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}
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void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {
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  move(offset(), jni_offset() + 1);
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}
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void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
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  move(offset(), jni_offset() + 1);
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}
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void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
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   move(offset(), jni_offset() + 2);
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   move(offset() + 1, jni_offset() + 1);
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}
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void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
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  box (offset(), jni_offset() + 1);
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}
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void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {
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  __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
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  __ movl(Address(to(), to_offset * wordSize), temp());
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}
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void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {
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  __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset)));
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  __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), NULL_WORD); // do not use temp() to avoid AGI
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  Label L;
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  __ jcc(Assembler::notZero, L);
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  __ movptr(temp(), NULL_WORD);
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  __ bind(L);
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  __ movptr(Address(to(), to_offset * wordSize), temp());
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}
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void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) {
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  // generate code to handle arguments
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  iterate(fingerprint);
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  // return result handler
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  __ lea(rax,
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         ExternalAddress((address)Interpreter::result_handler(method()->result_type())));
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  // return
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  __ ret(0);
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  __ flush();
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}
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Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return rdi; }
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Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return rsp; }
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Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return rcx; }
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// Implementation of SignatureHandlerLibrary
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void SignatureHandlerLibrary::pd_set_handler(address handler) {}
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class SlowSignatureHandler: public NativeSignatureIterator {
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 private:
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  address   _from;
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  intptr_t* _to;
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  virtual void pass_int() {
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    *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
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    _from -= Interpreter::stackElementSize;
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  }
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  virtual void pass_float() {
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    *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
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    _from -= Interpreter::stackElementSize;
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  }
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  virtual void pass_long() {
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    _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
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    _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
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    _to += 2;
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    _from -= 2*Interpreter::stackElementSize;
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  }
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  virtual void pass_object() {
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    // pass address of from
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    intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
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    *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
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    _from -= Interpreter::stackElementSize;
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   }
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 public:
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  SlowSignatureHandler(const methodHandle& method, address from, intptr_t* to) :
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    NativeSignatureIterator(method) {
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    _from = from;
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    _to   = to + (is_static() ? 2 : 1);
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  }
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};
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JRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* current, Method* method, intptr_t* from, intptr_t* to))
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  methodHandle m(current, (Method*)method);
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  assert(m->is_native(), "sanity check");
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  // handle arguments
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  SlowSignatureHandler(m, (address)from, to + 1).iterate((uint64_t)CONST64(-1));
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  // return result handler
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  return Interpreter::result_handler(m->result_type());
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JRT_END
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