1 /*
2 * Copyright (c) 1997, 2018, 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/codeCache.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 // ----------------------------------------------------------------------------
36
37 #define __ _masm.
38 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
39 // Stub is fixed up when the corresponding call is converted from
40 // calling compiled code to calling interpreted code.
41 // movq rbx, 0
42 // jmp -5 # to self
43
44 if (mark == NULL) {
45 mark = cbuf.insts_mark(); // Get mark within main instrs section.
46 }
47
48 // Note that the code buffer's insts_mark is always relative to insts.
49 // That's why we must use the macroassembler to generate a stub.
50 MacroAssembler _masm(&cbuf);
51
52 address base = __ start_a_stub(to_interp_stub_size());
53 if (base == NULL) {
54 return NULL; // CodeBuffer::expand failed.
55 }
56 // Static stub relocation stores the instruction address of the call.
57 __ relocate(static_stub_Relocation::spec(mark, false), Assembler::imm_operand);
58 // Static stub relocation also tags the Method* in the code-stream.
59 __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time.
60 // This is recognized as unresolved by relocs/nativeinst/ic code.
61 __ jump(RuntimeAddress(__ pc()));
62
63 assert(__ pc() - base <= to_interp_stub_size(), "wrong stub size");
64
65 // Update current stubs pointer and restore insts_end.
66 __ end_a_stub();
67 return base;
68 }
69 #undef __
70
71 int CompiledStaticCall::to_interp_stub_size() {
72 return NOT_LP64(10) // movl; jmp
73 LP64_ONLY(15); // movq (1+1+8); jmp (1+4)
74 }
75
76 int CompiledStaticCall::to_trampoline_stub_size() {
77 // x86 doesn't use trampolines.
78 return 0;
79 }
80
81 // Relocation entries for call stub, compiled java to interpreter.
82 int CompiledStaticCall::reloc_to_interp_stub() {
83 return 4; // 3 in emit_to_interp_stub + 1 in emit_call
84 }
85
86 #if INCLUDE_AOT
87 #define __ _masm.
88 void CompiledStaticCall::emit_to_aot_stub(CodeBuffer &cbuf, address mark) {
89 if (!UseAOT) {
90 return;
91 }
92 // Stub is fixed up when the corresponding call is converted from
93 // calling compiled code to calling aot code.
94 // movq rax, imm64_aot_code_address
95 // jmp rax
96
97 if (mark == NULL) {
98 mark = cbuf.insts_mark(); // Get mark within main instrs section.
99 }
100
101 // Note that the code buffer's insts_mark is always relative to insts.
102 // That's why we must use the macroassembler to generate a stub.
103 MacroAssembler _masm(&cbuf);
104
105 address base =
106 __ start_a_stub(to_aot_stub_size());
107 guarantee(base != NULL, "out of space");
108
109 // Static stub relocation stores the instruction address of the call.
110 __ relocate(static_stub_Relocation::spec(mark, true /* is_aot */), Assembler::imm_operand);
111 // Load destination AOT code address.
112 #ifdef _LP64
113 __ mov64(rax, CONST64(0)); // address is zapped till fixup time.
114 #else
115 __ movl(rax, 0); // address is zapped till fixup time.
116 #endif
117 // This is recognized as unresolved by relocs/nativeinst/ic code.
118 __ jmp(rax);
119
120 assert(__ pc() - base <= to_aot_stub_size(), "wrong stub size");
121
122 // Update current stubs pointer and restore insts_end.
123 __ end_a_stub();
124 }
125 #undef __
126
127 int CompiledStaticCall::to_aot_stub_size() {
128 if (UseAOT) {
129 return NOT_LP64(7) // movl; jmp
130 LP64_ONLY(12); // movq (1+1+8); jmp (2)
131 } else {
132 return 0;
133 }
134 }
135
136 // Relocation entries for call stub, compiled java to aot.
137 int CompiledStaticCall::reloc_to_aot_stub() {
138 if (UseAOT) {
139 return 2; // 1 in emit_to_aot_stub + 1 in emit_call
140 } else {
141 return 0;
142 }
143 }
144 #endif // INCLUDE_AOT
145
146 void CompiledDirectStaticCall::set_to_interpreted(const methodHandle& callee, address entry) {
147 address stub = find_stub(false /* is_aot */);
148 guarantee(stub != NULL, "stub not found");
149
150 if (TraceICs) {
151 ResourceMark rm;
152 tty->print_cr("CompiledDirectStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
153 p2i(instruction_address()),
154 callee->name_and_sig_as_C_string());
155 }
156
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 #ifdef ASSERT
162 // read the value once
163 volatile intptr_t data = method_holder->data();
164 volatile address destination = jump->jump_destination();
165 assert(data == 0 || data == (intptr_t)callee(),
166 "a) MT-unsafe modification of inline cache");
167 assert(destination == (address)-1 || destination == entry,
168 "b) MT-unsafe modification of inline cache");
169 #endif
170
171 // Update stub.
172 method_holder->set_data((intptr_t)callee());
173 jump->set_jump_destination(entry);
174
175 // Update jump to call.
176 set_destination_mt_safe(stub);
177 }
178
179 void CompiledDirectStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
180 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
181 // Reset stub.
182 address stub = static_stub->addr();
183 assert(stub != NULL, "stub not found");
184 // Creation also verifies the object.
185 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
186 method_holder->set_data(0);
187 if (!static_stub->is_aot()) {
188 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
189 jump->set_jump_destination((address)-1);
190 }
191 }
192
193
194 //-----------------------------------------------------------------------------
195 // Non-product mode code
196 #ifndef PRODUCT
197
198 void CompiledDirectStaticCall::verify() {
199 // Verify call.
200 _call->verify();
201 _call->verify_alignment();
202
203 #ifdef ASSERT
204 CodeBlob *cb = CodeCache::find_blob_unsafe((address) _call);
205 assert(cb && !cb->is_aot(), "CompiledDirectStaticCall cannot be used on AOTCompiledMethod");
206 #endif
207
208 // Verify stub.
209 address stub = find_stub(false /* is_aot */);
210 assert(stub != NULL, "no stub found for static call");
211 // Creation also verifies the object.
212 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
213 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
214
215 // Verify state.
216 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
217 }
218 #endif // !PRODUCT