1 /* 2 * Copyright (c) 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 #include "aot/compiledIC_aot.hpp" 25 #include "code/codeCache.hpp" 26 #include "memory/resourceArea.hpp" 27 28 void CompiledDirectStaticCall::set_to_far(const methodHandle& callee, address entry) { 29 address stub = find_stub(true /* is_far */); 30 guarantee(stub != NULL, "stub not found"); 31 32 if (TraceICs) { 33 ResourceMark rm; 34 tty->print_cr("CompiledDirectStaticCall@" INTPTR_FORMAT ": set_to_far %s", 35 p2i(instruction_address()), 36 callee->name_and_sig_as_C_string()); 37 } 38 39 // Creation also verifies the object. 40 // mov rax,imm_aot_addr 41 // jmp rax 42 NativeMovConstReg* destination_holder = nativeMovConstReg_at(stub); 43 44 #ifdef ASSERT 45 // read the value once 46 intptr_t data = destination_holder->data(); 47 assert(data == 0 || data == (intptr_t)entry, 48 "MT-unsafe modification of inline cache"); 49 #endif 50 51 // Update stub. 52 destination_holder->set_data((intptr_t)entry); 53 54 // Update jump to call. 55 set_destination_mt_safe(stub); 56 } 57 58 void CompiledPltStaticCall::set_to_interpreted(const methodHandle& callee, address entry) { 59 address stub = find_stub(); 60 guarantee(stub != NULL, "stub not found"); 61 if (TraceICs) { 62 ResourceMark rm; 63 tty->print_cr("CompiledPltStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s", 64 p2i(instruction_address()), 65 callee->name_and_sig_as_C_string()); 66 } 67 68 // Creation also verifies the object. 69 NativeLoadGot* method_loader = nativeLoadGot_at(stub); 70 NativeGotJump* jump = nativeGotJump_at(method_loader->next_instruction_address()); 71 72 intptr_t data = method_loader->data(); 73 address destination = jump->destination(); 74 assert(data == 0 || data == (intptr_t)callee(), 75 "a) MT-unsafe modification of inline cache"); 76 assert(destination == (address)-1 || destination == entry, 77 "b) MT-unsafe modification of inline cache"); 78 79 // Update stub. 80 method_loader->set_data((intptr_t)callee()); 81 jump->set_jump_destination(entry); 82 83 // Update jump to call. 84 set_destination_mt_safe(stub); 85 } 86 87 #ifdef NEVER_CALLED 88 void CompiledPltStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { 89 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 90 // Reset stub. 91 address stub = static_stub->addr(); 92 assert(stub != NULL, "stub not found"); 93 // Creation also verifies the object. 94 NativeLoadGot* method_loader = nativeLoadGot_at(stub); 95 NativeGotJump* jump = nativeGotJump_at(method_loader->next_instruction_address()); 96 method_loader->set_data(0); 97 jump->set_jump_destination((address)-1); 98 } 99 #endif 100 101 #ifndef PRODUCT 102 void CompiledPltStaticCall::verify() { 103 // Verify call. 104 _call->verify(); 105 106 #ifdef ASSERT 107 CodeBlob *cb = CodeCache::find_blob_unsafe((address) _call); 108 assert(cb && cb->is_aot(), "CompiledPltStaticCall can only be used on AOTCompiledMethod"); 109 #endif 110 111 // Verify stub. 112 address stub = find_stub(); 113 assert(stub != NULL, "no stub found for static call"); 114 // Creation also verifies the object. 115 NativeLoadGot* method_loader = nativeLoadGot_at(stub); 116 NativeGotJump* jump = nativeGotJump_at(method_loader->next_instruction_address()); 117 // Verify state. 118 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 119 } 120 #endif // !PRODUCT