Mercurial > hg > truffle
view src/cpu/x86/vm/interpreterRT_x86_32.cpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Thu, 20 Nov 2008 16:56:09 -0800 |
parents | 9ee9cf798b59 |
children | db4caa99ef11 |
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/* * Copyright 1998-2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_interpreterRT_x86_32.cpp.incl" #define __ _masm-> // Implementation of SignatureHandlerGenerator void InterpreterRuntime::SignatureHandlerGenerator::pass_int() { move(offset(), jni_offset() + 1); } void InterpreterRuntime::SignatureHandlerGenerator::pass_long() { move(offset(), jni_offset() + 2); move(offset() + 1, jni_offset() + 1); } void InterpreterRuntime::SignatureHandlerGenerator::pass_object() { box (offset(), jni_offset() + 1); } void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) { __ movl(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset))); __ movl(Address(to(), to_offset * wordSize), temp()); } void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) { __ lea(temp(), Address(from(), Interpreter::local_offset_in_bytes(from_offset))); __ cmpptr(Address(from(), Interpreter::local_offset_in_bytes(from_offset)), (int32_t)NULL_WORD); // do not use temp() to avoid AGI Label L; __ jcc(Assembler::notZero, L); __ movptr(temp(), ((int32_t)NULL_WORD)); __ bind(L); __ movptr(Address(to(), to_offset * wordSize), temp()); } void InterpreterRuntime::SignatureHandlerGenerator::generate( uint64_t fingerprint) { // generate code to handle arguments iterate(fingerprint); // return result handler __ lea(rax, ExternalAddress((address)Interpreter::result_handler(method()->result_type()))); // return __ ret(0); __ flush(); } Register InterpreterRuntime::SignatureHandlerGenerator::from() { return rdi; } Register InterpreterRuntime::SignatureHandlerGenerator::to() { return rsp; } Register InterpreterRuntime::SignatureHandlerGenerator::temp() { return rcx; } // Implementation of SignatureHandlerLibrary void SignatureHandlerLibrary::pd_set_handler(address handler) {} class SlowSignatureHandler: public NativeSignatureIterator { private: address _from; intptr_t* _to; #ifdef ASSERT void verify_tag(frame::Tag t) { assert(!TaggedStackInterpreter || *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag"); } #endif // ASSERT virtual void pass_int() { *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0)); debug_only(verify_tag(frame::TagValue)); _from -= Interpreter::stackElementSize(); } virtual void pass_long() { _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1)); _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0)); debug_only(verify_tag(frame::TagValue)); _to += 2; _from -= 2*Interpreter::stackElementSize(); } virtual void pass_object() { // pass address of from intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0)); *_to++ = (*(intptr_t*)from_addr == 0) ? NULL : from_addr; debug_only(verify_tag(frame::TagReference)); _from -= Interpreter::stackElementSize(); } public: SlowSignatureHandler(methodHandle method, address from, intptr_t* to) : NativeSignatureIterator(method) { _from = from; _to = to + (is_static() ? 2 : 1); } }; IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(JavaThread* thread, methodOopDesc* method, intptr_t* from, intptr_t* to)) methodHandle m(thread, (methodOop)method); assert(m->is_native(), "sanity check"); // handle arguments SlowSignatureHandler(m, (address)from, to + 1).iterate(UCONST64(-1)); // return result handler return Interpreter::result_handler(m->result_type()); IRT_END