1/* 2 * Copyright (c) 1997, 2016, 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 "asm/macroAssembler.inline.hpp" 27#include "code/compiledIC.hpp" 28#include "code/icBuffer.hpp" 29#include "code/nmethod.hpp" 30#include "memory/resourceArea.hpp" 31#include "runtime/mutexLocker.hpp" 32#include "runtime/safepoint.hpp" 33#ifdef COMPILER2 34#include "opto/matcher.hpp" 35#endif 36 37// ---------------------------------------------------------------------------- 38 39#define __ _masm. 40address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) { 41 // Stub is fixed up when the corresponding call is converted from calling 42 // compiled code to calling interpreted code. 43 // set (empty), G5 44 // jmp -1 45 46 if (mark == NULL) { 47 mark = cbuf.insts_mark(); // Get mark within main instrs section. 48 } 49 50 MacroAssembler _masm(&cbuf); 51 52 address base = __ start_a_stub(to_interp_stub_size()); 53 if (base == NULL) { 54 return NULL; // CodeBuffer::expand failed. 55 } 56 57 // Static stub relocation stores the instruction address of the call. 58 __ relocate(static_stub_Relocation::spec(mark)); 59 60 __ set_metadata(NULL, as_Register(Matcher::inline_cache_reg_encode())); 61 62 __ set_inst_mark(); 63 AddressLiteral addrlit(-1); 64 __ JUMP(addrlit, G3, 0); 65 66 __ delayed()->nop(); 67 68 assert(__ pc() - base <= to_interp_stub_size(), "wrong stub size"); 69 70 // Update current stubs pointer and restore code_end. 71 __ end_a_stub(); 72 return base; 73} 74#undef __ 75 76int CompiledStaticCall::to_interp_stub_size() { 77 // This doesn't need to be accurate but it must be larger or equal to 78 // the real size of the stub. 79 return (NativeMovConstReg::instruction_size + // sethi/setlo; 80 NativeJump::instruction_size); // sethi; jmp; nop 81} 82 83// Relocation entries for call stub, compiled java to interpreter. 84int CompiledStaticCall::reloc_to_interp_stub() { 85 return 10; // 4 in emit_java_to_interp + 1 in Java_Static_Call 86} 87 88void CompiledDirectStaticCall::set_to_interpreted(const methodHandle& callee, address entry) { 89 address stub = find_stub(/*is_aot*/ false); 90 guarantee(stub != NULL, "stub not found"); 91 92 if (TraceICs) { 93 ResourceMark rm; 94 tty->print_cr("CompiledDirectStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", 95 p2i(instruction_address()), 96 callee->name_and_sig_as_C_string()); 97 } 98 99 // Creation also verifies the object. 100 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 101 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 102 103#ifdef ASSERT 104 // read the value once 105 intptr_t data = method_holder->data(); 106 address destination = jump->jump_destination(); 107 assert(data == 0 || data == (intptr_t)callee(), 108 "a) MT-unsafe modification of inline cache"); 109 assert(destination == (address)-1 || destination == entry, 110 "b) MT-unsafe modification of inline cache"); 111#endif 112 113 // Update stub. 114 method_holder->set_data((intptr_t)callee()); 115 jump->set_jump_destination(entry); 116 117 // Update jump to call. 118 set_destination_mt_safe(stub); 119} 120 121void CompiledDirectStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { 122 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 123 // Reset stub. 124 address stub = static_stub->addr(); 125 assert(stub != NULL, "stub not found"); 126 // Creation also verifies the object. 127 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 128 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 129 method_holder->set_data(0); 130 jump->set_jump_destination((address)-1); 131} 132 133//----------------------------------------------------------------------------- 134// Non-product mode code 135#ifndef PRODUCT 136 137void CompiledDirectStaticCall::verify() { 138 // Verify call. 139 _call->verify(); 140 if (os::is_MP()) { 141 _call->verify_alignment(); 142 } 143 144 // Verify stub. 145 address stub = find_stub(/*is_aot*/ false); 146 assert(stub != NULL, "no stub found for static call"); 147 // Creation also verifies the object. 148 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 149 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 150 151 // Verify state. 152 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 153} 154 155#endif // !PRODUCT 156