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, address mark) {
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 if (mark == NULL) {
61 mark = cbuf.insts_mark(); // Get mark within main instrs section.
62 }
63
64 // Note that the code buffer's insts_mark is always relative to insts.
65 // That's why we must use the macroassembler to generate a stub.
66 MacroAssembler _masm(&cbuf);
67
68 address base = __ start_a_stub(to_interp_stub_size());
69 int offset = __ offset();
70 if (base == NULL) {
71 return NULL; // CodeBuffer::expand failed
72 }
73 // static stub relocation stores the instruction address of the call
74 __ relocate(static_stub_Relocation::spec(mark));
75 // static stub relocation also tags the Method* in the code-stream.
76 __ mov_metadata(rmethod, (Metadata*)NULL);
77 __ movptr(rscratch1, 0);
78 __ br(rscratch1);
79
80 assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");
81 __ end_a_stub();
82 return base;
83 }
84 #undef __
85
86 int CompiledStaticCall::to_interp_stub_size() {
87 return 7 * NativeInstruction::instruction_size;
88 }
89
90 // Relocation entries for call stub, compiled java to interpreter.
91 int CompiledStaticCall::reloc_to_interp_stub() {
92 return 4; // 3 in emit_to_interp_stub + 1 in emit_call
93 }
94
95 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
96 address stub = find_stub();
97 guarantee(stub != NULL, "stub not found");
98
99 if (TraceICs) {
100 ResourceMark rm;
101 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
102 p2i(instruction_address()),
103 callee->name_and_sig_as_C_string());
104 }
105
106 // Creation also verifies the object.
107 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
108 #ifndef PRODUCT
109 NativeGeneralJump* jump = nativeGeneralJump_at(method_holder->next_instruction_address());
110
111 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
112 "a) MT-unsafe modification of inline cache");
113 assert(method_holder->data() == 0 || jump->jump_destination() == entry,
114 "b) MT-unsafe modification of inline cache");
115 #endif
116 // Update stub.
117 method_holder->set_data((intptr_t)callee());
118 NativeGeneralJump::insert_unconditional(method_holder->next_instruction_address(), entry);
119 ICache::invalidate_range(stub, to_interp_stub_size());
120 // Update jump to call.
121 set_destination_mt_safe(stub);
122 }
123
124 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
125 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
126 // Reset stub.
127 address stub = static_stub->addr();
128 assert(stub != NULL, "stub not found");
129 // Creation also verifies the object.
130 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
131 method_holder->set_data(0);
132 }
133
134 //-----------------------------------------------------------------------------
135 // Non-product mode code
136 #ifndef PRODUCT
137
138 void CompiledStaticCall::verify() {
139 // Verify call.
140 NativeCall::verify();
141 if (os::is_MP()) {
142 verify_alignment();
143 }
144
145 // Verify stub.
146 address stub = find_stub();
147 assert(stub != NULL, "no stub found for static call");
148 // Creation also verifies the object.
149 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
150 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
151
152 // Verify state.
153 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
154 }
155
156 #endif // !PRODUCT