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