1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016 SAP SE. 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 #ifdef COMPILER2
35 #include "opto/matcher.hpp"
36 #endif
37
38 // ----------------------------------------------------------------------------
39
40 #undef __
41 #define __ _masm.
42
43 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark/* = NULL*/) {
44 #ifdef COMPILER2
45 // Stub is fixed up when the corresponding call is converted from calling
46 // compiled code to calling interpreted code.
47 if (mark == NULL) {
48 // Get the mark within main instrs section which is set to the address of the call.
49 mark = cbuf.insts_mark();
50 }
51 assert(mark != NULL, "mark must not be NULL");
52
53 // Note that the code buffer's insts_mark is always relative to insts.
54 // That's why we must use the macroassembler to generate a stub.
55 MacroAssembler _masm(&cbuf);
56
57 address stub = __ start_a_stub(Compile::MAX_stubs_size);
58 if (stub == NULL) {
59 return NULL; // CodeBuffer::expand failed.
60 }
61 __ relocate(static_stub_Relocation::spec(mark));
62
63 AddressLiteral meta = __ allocate_metadata_address(NULL);
64 bool success = __ load_const_from_toc(as_Register(Matcher::inline_cache_reg_encode()), meta);
65
66 __ set_inst_mark();
67 AddressLiteral a((address)-1);
68 success = success && __ load_const_from_toc(Z_R1, a);
69 if (!success) {
70 return NULL; // CodeCache is full.
71 }
72
73 __ z_br(Z_R1);
74 __ end_a_stub(); // Update current stubs pointer and restore insts_end.
75 return stub;
76 #else
77 ShouldNotReachHere();
78 #endif
79 }
80
81 #undef __
82
83 int CompiledStaticCall::to_interp_stub_size() {
84 return 2 * MacroAssembler::load_const_from_toc_size() +
85 2; // branch
86 }
87
88 // Relocation entries for call stub, compiled java to interpreter.
89 int CompiledStaticCall::reloc_to_interp_stub() {
90 return 5; // 4 in emit_java_to_interp + 1 in Java_Static_Call
91 }
92
93 void CompiledDirectStaticCall::set_to_interpreted(methodHandle callee, address entry) {
94 address stub = find_stub(/*is_aot*/ false);
95 guarantee(stub != NULL, "stub not found");
96
97 if (TraceICs) {
98 ResourceMark rm;
99 tty->print_cr("CompiledDirectStaticCall@" 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 + NativeCall::get_IC_pos_in_java_to_interp_stub());
106 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
107
108 // A generated lambda form might be deleted from the Lambdaform
109 // cache in MethodTypeForm. If a jit compiled lambdaform method
110 // becomes not entrant and the cache access returns null, the new
111 // resolve will lead to a new generated LambdaForm.
112
113 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee() || callee->is_compiled_lambda_form(),
114 "a) MT-unsafe modification of inline cache");
115 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
116 "b) MT-unsafe modification of inline cache");
117
118 // Update stub.
119 method_holder->set_data((intptr_t)callee());
120 jump->set_jump_destination(entry);
121
122 // Update jump to call.
123 set_destination_mt_safe(stub);
124 }
125
126 void CompiledDirectStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
127 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
128 // Reset stub.
129 address stub = static_stub->addr();
130 assert(stub != NULL, "stub not found");
131 // Creation also verifies the object.
132 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + NativeCall::get_IC_pos_in_java_to_interp_stub());
133 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
134 method_holder->set_data(0);
135 jump->set_jump_destination((address)-1);
136 }
137
138 //-----------------------------------------------------------------------------
139
140 #ifndef PRODUCT
141
142 void CompiledDirectStaticCall::verify() {
143 // Verify call.
144 _call->verify();
145 if (os::is_MP()) {
146 _call->verify_alignment();
147 }
148
149 // Verify stub.
150 address stub = find_stub(/*is_aot*/ false);
151 assert(stub != NULL, "no stub found for static call");
152 // Creation also verifies the object.
153 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + NativeCall::get_IC_pos_in_java_to_interp_stub());
154 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
155
156 // Verify state.
157 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
158 }
159
160 #endif // !PRODUCT