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
34 // Release the CompiledICHolder* associated with this call site is there is one.
35 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
36 // This call site might have become stale so inspect it carefully.
37 NativeCall* call = nativeCall_at(call_site->addr());
38 if (is_icholder_entry(call->destination())) {
39 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
40 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
41 }
42 }
43
44 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
45 // This call site might have become stale so inspect it carefully.
46 NativeCall* call = nativeCall_at(call_site->addr());
47 return is_icholder_entry(call->destination());
48 }
49
50 // ----------------------------------------------------------------------------
51
52 #define __ _masm.
53 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
54 // Stub is fixed up when the corresponding call is converted from
55 // calling compiled code to calling interpreted code.
56 // movq rmethod, 0
57 // jmp -4 # to self
58
59 // address mark = cbuf.insts_mark(); // Get mark within main instrs section.
60
61 // Note that the code buffer's insts_mark is always relative to insts.
62 // That's why we must use the macroassembler to generate a stub.
63 MacroAssembler _masm(&cbuf);
64
65 address base = __ start_a_stub(to_interp_stub_size());
66 int offset = __ offset();
67 if (base == NULL) {
68 return NULL; // CodeBuffer::expand failed
69 }
70 // static stub relocation stores the instruction address of the call
71 __ relocate(static_stub_Relocation::spec(mark));
72 // static stub relocation also tags the Method* in the code-stream.
73 __ mov_metadata(rmethod, (Metadata*)NULL);
74 __ movptr(rscratch1, 0);
75 __ br(rscratch1);
76
77 assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");
78 __ end_a_stub();
79 return base;
80 }
81 #undef __
82
83 int CompiledStaticCall::to_interp_stub_size() {
84 return 7 * NativeInstruction::instruction_size;
85 }
86
87 // Relocation entries for call stub, compiled java to interpreter.
88 int CompiledStaticCall::reloc_to_interp_stub() {
89 return 4; // 3 in emit_to_interp_stub + 1 in emit_call
90 }
91
92 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
93 address stub = find_stub();
94 guarantee(stub != NULL, "stub not found");
95
96 if (TraceICs) {
97 ResourceMark rm;
98 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
99 p2i(instruction_address()),
100 callee->name_and_sig_as_C_string());
101 }
102
103 // Creation also verifies the object.
104 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
105 #ifndef PRODUCT
106 NativeGeneralJump* jump = nativeGeneralJump_at(method_holder->next_instruction_address());
107
108 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
109 "a) MT-unsafe modification of inline cache");
110 assert(method_holder->data() == 0 || jump->jump_destination() == entry,
111 "b) MT-unsafe modification of inline cache");
112 #endif
113 // Update stub.
114 method_holder->set_data((intptr_t)callee());
115 NativeGeneralJump::insert_unconditional(method_holder->next_instruction_address(), entry);
116 ICache::invalidate_range(stub, to_interp_stub_size());
117 // Update jump to call.
118 set_destination_mt_safe(stub);
119 }
120
121 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
122 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
123 // Reset stub.
124 address stub = static_stub->addr();
125 assert(stub != NULL, "stub not found");
126 // Creation also verifies the object.
127 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
128 method_holder->set_data(0);
129 }
130
131 //-----------------------------------------------------------------------------
132 // Non-product mode code
133 #ifndef PRODUCT
134
135 void CompiledStaticCall::verify() {
136 // Verify call.
137 NativeCall::verify();
138 if (os::is_MP()) {
139 verify_alignment();
140 }
141
142 // Verify stub.
143 address stub = find_stub();
144 assert(stub != NULL, "no stub found for static call");
145 // Creation also verifies the object.
146 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
147 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
148
149 // Verify state.
150 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
151 }
152
153 #endif // !PRODUCT