1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/macroAssembler.inline.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/nmethod.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "runtime/mutexLocker.hpp" 33 #include "runtime/safepoint.hpp" 34 35 // Release the CompiledICHolder* associated with this call site is there is one. 36 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) { 37 // This call site might have become stale so inspect it carefully. 38 NativeCall* call = nativeCall_at(call_site->addr()); 39 if (is_icholder_entry(call->destination())) { 40 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value()); 41 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data()); 42 } 43 } 44 45 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) { 46 // This call site might have become stale so inspect it carefully. 47 NativeCall* call = nativeCall_at(call_site->addr()); 48 return is_icholder_entry(call->destination()); 49 } 50 51 // ---------------------------------------------------------------------------- 52 53 #define __ _masm. 54 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) { 55 // Stub is fixed up when the corresponding call is converted from 56 // calling compiled code to calling interpreted code. 57 // mov rmethod, 0 58 // jmp -4 # to self 59 60 address mark = cbuf.insts_mark(); // Get mark within main instrs section. 61 62 // Note that the code buffer's insts_mark is always relative to insts. 63 // That's why we must use the macroassembler to generate a stub. 64 MacroAssembler _masm(&cbuf); 65 66 address base = __ start_a_stub(to_interp_stub_size()); 67 int offset = __ offset(); 68 if (base == NULL) { 69 return NULL; // CodeBuffer::expand failed 70 } 71 // static stub relocation stores the instruction address of the call 72 __ relocate(static_stub_Relocation::spec(mark)); 73 // static stub relocation also tags the Method* in the code-stream. 74 __ mov_metadata(rmethod, (Metadata*)NULL); 75 __ movptr(rscratch1, 0); 76 __ br(rscratch1); 77 78 assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big"); 79 __ end_a_stub(); 80 return base; 81 } 82 #undef __ 83 84 int CompiledStaticCall::to_interp_stub_size() { 85 return 7 * NativeInstruction::instruction_size; 86 } 87 88 // Relocation entries for call stub, compiled java to interpreter. 89 int CompiledStaticCall::reloc_to_interp_stub() { 90 return 4; // 3 in emit_to_interp_stub + 1 in emit_call 91 } 92 93 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) { 94 address stub = find_stub(); 95 guarantee(stub != NULL, "stub not found"); 96 97 if (TraceICs) { 98 ResourceMark rm; 99 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", 100 p2i(instruction_address()), 101 callee->name_and_sig_as_C_string()); 102 } 103 104 // Creation also verifies the object. 105 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 106 #ifndef PRODUCT 107 NativeGeneralJump* jump = nativeGeneralJump_at(method_holder->next_instruction_address()); 108 109 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(), 110 "a) MT-unsafe modification of inline cache"); 111 assert(method_holder->data() == 0 || jump->jump_destination() == entry, 112 "b) MT-unsafe modification of inline cache"); 113 #endif 114 // Update stub. 115 method_holder->set_data((intptr_t)callee()); 116 NativeGeneralJump::insert_unconditional(method_holder->next_instruction_address(), entry); 117 ICache::invalidate_range(stub, to_interp_stub_size()); 118 // Update jump to call. 119 set_destination_mt_safe(stub); 120 } 121 122 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { 123 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 124 // Reset stub. 125 address stub = static_stub->addr(); 126 assert(stub != NULL, "stub not found"); 127 // Creation also verifies the object. 128 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 129 method_holder->set_data(0); 130 } 131 132 //----------------------------------------------------------------------------- 133 // Non-product mode code 134 #ifndef PRODUCT 135 136 void CompiledStaticCall::verify() { 137 // Verify call. 138 NativeCall::verify(); 139 if (os::is_MP()) { 140 verify_alignment(); 141 } 142 143 // Verify stub. 144 address stub = find_stub(); 145 assert(stub != NULL, "no stub found for static call"); 146 // Creation also verifies the object. 147 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub); 148 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 149 150 // Verify state. 151 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 152 } 153 154 #endif // !PRODUCT