1 /*
2 * Copyright (c) 1997, 2013, 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 // Release the CompiledICHolder* associated with this call site is there is one.
38 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
39 // This call site might have become stale so inspect it carefully.
40 NativeCall* call = nativeCall_at(call_site->addr());
41 if (is_icholder_entry(call->destination())) {
42 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
43 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
44 }
45 }
46
47 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
48 // This call site might have become stale so inspect it carefully.
49 NativeCall* call = nativeCall_at(call_site->addr());
50 return is_icholder_entry(call->destination());
51 }
52
53 // ----------------------------------------------------------------------------
54
55 #define __ _masm.
56 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
57 #ifdef COMPILER2
58 // Stub is fixed up when the corresponding call is converted from calling
59 // compiled code to calling interpreted code.
60 // set (empty), G5
61 // jmp -1
62
63 address mark = cbuf.insts_mark(); // Get mark within main instrs section.
64
65 MacroAssembler _masm(&cbuf);
66
67 address base = __ start_a_stub(to_interp_stub_size());
68 if (base == NULL) {
69 return NULL; // CodeBuffer::expand failed.
70 }
71
72 // Static stub relocation stores the instruction address of the call.
73 __ relocate(static_stub_Relocation::spec(mark));
74
75 __ set_metadata(NULL, as_Register(Matcher::inline_cache_reg_encode()));
76
77 __ set_inst_mark();
78 AddressLiteral addrlit(-1);
79 __ JUMP(addrlit, G3, 0);
80
81 __ delayed()->nop();
82
83 // Update current stubs pointer and restore code_end.
84 __ end_a_stub();
85 return base;
86 #else
87 ShouldNotReachHere();
88 #endif
89 }
90 #undef __
91
92 int CompiledStaticCall::to_interp_stub_size() {
93 // This doesn't need to be accurate but it must be larger or equal to
94 // the real size of the stub.
95 return (NativeMovConstReg::instruction_size + // sethi/setlo;
96 NativeJump::instruction_size + // sethi; jmp; nop
97 (TraceJumps ? 20 * BytesPerInstWord : 0) );
98 }
99
100 // Relocation entries for call stub, compiled java to interpreter.
101 int CompiledStaticCall::reloc_to_interp_stub() {
102 return 10; // 4 in emit_java_to_interp + 1 in Java_Static_Call
103 }
104
105 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
106 address stub = find_stub();
107 guarantee(stub != NULL, "stub not found");
108
109 if (TraceICs) {
110 ResourceMark rm;
111 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
112 instruction_address(),
113 callee->name_and_sig_as_C_string());
114 }
115
116 // Creation also verifies the object.
117 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
118 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
119
120 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
121 "a) MT-unsafe modification of inline cache");
122 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
123 "b) MT-unsafe modification of inline cache");
124
125 // Update stub.
126 method_holder->set_data((intptr_t)callee());
127 jump->set_jump_destination(entry);
128
129 // Update jump to call.
130 set_destination_mt_safe(stub);
131 }
132
133 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
134 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
135 // Reset stub.
136 address stub = static_stub->addr();
137 assert(stub != NULL, "stub not found");
138 // Creation also verifies the object.
139 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
140 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
141 method_holder->set_data(0);
142 jump->set_jump_destination((address)-1);
143 }
144
145 //-----------------------------------------------------------------------------
146 // Non-product mode code
147 #ifndef PRODUCT
148
149 void CompiledStaticCall::verify() {
150 // Verify call.
151 NativeCall::verify();
152 if (os::is_MP()) {
153 verify_alignment();
154 }
155
156 // Verify stub.
157 address stub = find_stub();
158 assert(stub != NULL, "no stub found for static call");
159 // Creation also verifies the object.
160 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
161 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
162
163 // Verify state.
164 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
165 }
166
167 #endif // !PRODUCT