1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2016 SAP SE. 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 #ifdef COMPILER2 35 #include "opto/matcher.hpp" 36 #endif 37 38 // ---------------------------------------------------------------------------- 39 40 #undef __ 41 #define __ _masm. 42 43 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark/* = NULL*/) { 44 #ifdef COMPILER2 45 // Stub is fixed up when the corresponding call is converted from calling 46 // compiled code to calling interpreted code. 47 if (mark == NULL) { 48 // Get the mark within main instrs section which is set to the address of the call. 49 mark = cbuf.insts_mark(); 50 } 51 assert(mark != NULL, "mark must not be NULL"); 52 53 // Note that the code buffer's insts_mark is always relative to insts. 54 // That's why we must use the macroassembler to generate a stub. 55 MacroAssembler _masm(&cbuf); 56 57 address stub = __ start_a_stub(Compile::MAX_stubs_size); 58 if (stub == NULL) { 59 return NULL; // CodeBuffer::expand failed. 60 } 61 __ relocate(static_stub_Relocation::spec(mark)); 62 63 AddressLiteral meta = __ allocate_metadata_address(NULL); 64 bool success = __ load_const_from_toc(as_Register(Matcher::inline_cache_reg_encode()), meta); 65 66 __ set_inst_mark(); 67 AddressLiteral a((address)-1); 68 success = success && __ load_const_from_toc(Z_R1, a); 69 if (!success) { 70 return NULL; // CodeCache is full. 71 } 72 73 __ z_br(Z_R1); 74 __ end_a_stub(); // Update current stubs pointer and restore insts_end. 75 return stub; 76 #else 77 ShouldNotReachHere(); 78 #endif 79 } 80 81 #undef __ 82 83 int CompiledStaticCall::to_interp_stub_size() { 84 return 2 * MacroAssembler::load_const_from_toc_size() + 85 2; // branch 86 } 87 88 // Relocation entries for call stub, compiled java to interpreter. 89 int CompiledStaticCall::reloc_to_interp_stub() { 90 return 5; // 4 in emit_java_to_interp + 1 in Java_Static_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 + get_IC_pos_in_java_to_interp_stub()); 106 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 107 108 // A generated lambda form might be deleted from the Lambdaform 109 // cache in MethodTypeForm. If a jit compiled lambdaform method 110 // becomes not entrant and the cache access returns null, the new 111 // resolve will lead to a new generated LambdaForm. 112 113 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee() || callee->is_compiled_lambda_form(), 114 "a) MT-unsafe modification of inline cache"); 115 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry, 116 "b) MT-unsafe modification of inline cache"); 117 118 // Update stub. 119 method_holder->set_data((intptr_t)callee()); 120 jump->set_jump_destination(entry); 121 122 // Update jump to call. 123 set_destination_mt_safe(stub); 124 } 125 126 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) { 127 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call"); 128 // Reset stub. 129 address stub = static_stub->addr(); 130 assert(stub != NULL, "stub not found"); 131 // Creation also verifies the object. 132 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + get_IC_pos_in_java_to_interp_stub()); 133 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 134 method_holder->set_data(0); 135 jump->set_jump_destination((address)-1); 136 } 137 138 //----------------------------------------------------------------------------- 139 140 #ifndef PRODUCT 141 142 void CompiledStaticCall::verify() { 143 // Verify call. 144 NativeCall::verify(); 145 if (os::is_MP()) { 146 verify_alignment(); 147 } 148 149 // Verify stub. 150 address stub = find_stub(); 151 assert(stub != NULL, "no stub found for static call"); 152 // Creation also verifies the object. 153 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + get_IC_pos_in_java_to_interp_stub()); 154 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address()); 155 156 // Verify state. 157 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check"); 158 } 159 160 #endif // !PRODUCT