1 /*
2 * Copyright (c) 1997, 2019, 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 // ----------------------------------------------------------------------------
38
39 #define __ _masm.
40 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
41 // Stub is fixed up when the corresponding call is converted from calling
42 // compiled code to calling interpreted code.
43 // set (empty), G5
44 // jmp -1
45
46 if (mark == NULL) {
47 mark = cbuf.insts_mark(); // Get mark within main instrs section.
48 }
49
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
57 // Static stub relocation stores the instruction address of the call.
58 __ relocate(static_stub_Relocation::spec(mark));
59
60 __ set_metadata(NULL, as_Register(Matcher::inline_cache_reg_encode()));
61
62 __ set_inst_mark();
63 AddressLiteral addrlit(-1);
64 __ JUMP(addrlit, G3, 0);
65
66 __ delayed()->nop();
67
68 assert(__ pc() - base <= to_interp_stub_size(), "wrong stub size");
69
70 // Update current stubs pointer and restore code_end.
71 __ end_a_stub();
72 return base;
73 }
74 #undef __
75
76 int CompiledStaticCall::to_trampoline_stub_size() {
77 // SPARC doesn't use trampolines.
78 return 0;
79 }
80
81 int CompiledStaticCall::to_interp_stub_size() {
82 // This doesn't need to be accurate but it must be larger or equal to
83 // the real size of the stub.
84 return (NativeMovConstReg::instruction_size + // sethi/setlo;
85 NativeJump::instruction_size); // sethi; jmp; nop
86 }
87
88 // Relocation entries for call stub, compiled java to interpreter.
89 int CompiledStaticCall::reloc_to_interp_stub() {
90 return 10; // 4 in emit_java_to_interp + 1 in Java_Static_Call
91 }
92
93 void CompiledDirectStaticCall::set_to_interpreted(const 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);
106 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
107 verify_mt_safe(callee, entry, method_holder, jump);
108
109 // Update stub.
110 method_holder->set_data((intptr_t)callee());
111 jump->set_jump_destination(entry);
112
113 // Update jump to call.
114 set_destination_mt_safe(stub);
115 }
116
117 void CompiledDirectStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
118 // Reset stub.
119 address stub = static_stub->addr();
120 assert(stub != NULL, "stub not found");
121 assert(CompiledICLocker::is_safe(stub), "mt unsafe call");
122 // Creation also verifies the object.
123 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
124 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
125 method_holder->set_data(0);
126 jump->set_jump_destination((address)-1);
127 }
128
129 //-----------------------------------------------------------------------------
130 // Non-product mode code
131 #ifndef PRODUCT
132
133 void CompiledDirectStaticCall::verify() {
134 // Verify call.
135 _call->verify();
136 _call->verify_alignment();
137
138 // Verify stub.
139 address stub = find_stub(/*is_aot*/ false);
140 assert(stub != NULL, "no stub found for static call");
141 // Creation also verifies the object.
142 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
143 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
144
145 // Verify state.
146 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
147 }
148
149 #endif // !PRODUCT