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 void 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 =
68 __ start_a_stub(to_interp_stub_size()*2);
69 if (base == NULL) return; // CodeBuffer::expand failed.
70
71 // Static stub relocation stores the instruction address of the call.
72 __ relocate(static_stub_Relocation::spec(mark));
73
74 __ set_metadata(NULL, as_Register(Matcher::inline_cache_reg_encode()));
75
76 __ set_inst_mark();
77 AddressLiteral addrlit(-1);
78 __ JUMP(addrlit, G3, 0);
79
80 __ delayed()->nop();
81
82 // Update current stubs pointer and restore code_end.
83 __ end_a_stub();
84 #else
85 ShouldNotReachHere();
86 #endif
87 }
88 #undef __
89
90 int CompiledStaticCall::to_interp_stub_size() {
91 // This doesn't need to be accurate but it must be larger or equal to
92 // the real size of the stub.
93 return (NativeMovConstReg::instruction_size + // sethi/setlo;
94 NativeJump::instruction_size + // sethi; jmp; nop
95 (TraceJumps ? 20 * BytesPerInstWord : 0) );
96 }
97
98 // Relocation entries for call stub, compiled java to interpreter.
99 int CompiledStaticCall::reloc_to_interp_stub() {
100 return 10; // 4 in emit_java_to_interp + 1 in Java_Static_Call
101 }
102
103 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
104 address stub = find_stub();
105 guarantee(stub != NULL, "stub not found");
106
107 if (TraceICs) {
108 ResourceMark rm;
109 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
110 instruction_address(),
111 callee->name_and_sig_as_C_string());
112 }
113
114 // Creation also verifies the object.
115 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
116 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
117
118 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
119 "a) MT-unsafe modification of inline cache");
120 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
121 "b) MT-unsafe modification of inline cache");
122
123 // Update stub.
124 method_holder->set_data((intptr_t)callee());
125 jump->set_jump_destination(entry);
126
127 // Update jump to call.
128 set_destination_mt_safe(stub);
129 }
130
131 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
132 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
133 // Reset stub.
134 address stub = static_stub->addr();
135 assert(stub != NULL, "stub not found");
136 // Creation also verifies the object.
137 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
138 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
139 method_holder->set_data(0);
140 jump->set_jump_destination((address)-1);
141 }
142
143 //-----------------------------------------------------------------------------
144 // Non-product mode code
145 #ifndef PRODUCT
146
147 void CompiledStaticCall::verify() {
148 // Verify call.
149 NativeCall::verify();
150 if (os::is_MP()) {
151 verify_alignment();
152 }
153
154 // Verify stub.
155 address stub = find_stub();
156 assert(stub != NULL, "no stub found for static call");
157 // Creation also verifies the object.
158 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
159 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
160
161 // Verify state.
162 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
163 }
164
165 #endif // !PRODUCT