Sat, 01 Sep 2012 13:25:18 -0400
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
1 /*
2 * Copyright (c) 1998, 2012, 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 */
25 #include "precompiled.hpp"
26 #include "asm/assembler.inline.hpp"
27 #include "assembler_x86.inline.hpp"
28 #include "code/relocInfo.hpp"
29 #include "nativeInst_x86.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/safepoint.hpp"
34 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {
35 #ifdef AMD64
36 x += o;
37 typedef Assembler::WhichOperand WhichOperand;
38 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop
39 assert(which == Assembler::disp32_operand ||
40 which == Assembler::narrow_oop_operand ||
41 which == Assembler::imm_operand, "format unpacks ok");
42 if (which == Assembler::imm_operand) {
43 if (verify_only) {
44 assert(*pd_address_in_code() == x, "instructions must match");
45 } else {
46 *pd_address_in_code() = x;
47 }
48 } else if (which == Assembler::narrow_oop_operand) {
49 address disp = Assembler::locate_operand(addr(), which);
50 // both compressed oops and compressed classes look the same
51 if (Universe::heap()->is_in_reserved((oop)x)) {
52 if (verify_only) {
53 assert(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match");
54 } else {
55 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
56 }
57 } else {
58 if (verify_only) {
59 assert(*(uint32_t*) disp == oopDesc::encode_klass((Klass*)x), "instructions must match");
60 } else {
61 *(int32_t*) disp = oopDesc::encode_klass((Klass*)x);
62 }
63 }
64 } else {
65 // Note: Use runtime_call_type relocations for call32_operand.
66 address ip = addr();
67 address disp = Assembler::locate_operand(ip, which);
68 address next_ip = Assembler::locate_next_instruction(ip);
69 if (verify_only) {
70 assert(*(int32_t*) disp == (x - next_ip), "instructions must match");
71 } else {
72 *(int32_t*) disp = x - next_ip;
73 }
74 }
75 #else
76 if (verify_only) {
77 assert(*pd_address_in_code() == (x + o), "instructions must match");
78 } else {
79 *pd_address_in_code() = x + o;
80 }
81 #endif // AMD64
82 }
85 address Relocation::pd_call_destination(address orig_addr) {
86 intptr_t adj = 0;
87 if (orig_addr != NULL) {
88 // We just moved this call instruction from orig_addr to addr().
89 // This means its target will appear to have grown by addr() - orig_addr.
90 adj = -( addr() - orig_addr );
91 }
92 NativeInstruction* ni = nativeInstruction_at(addr());
93 if (ni->is_call()) {
94 return nativeCall_at(addr())->destination() + adj;
95 } else if (ni->is_jump()) {
96 return nativeJump_at(addr())->jump_destination() + adj;
97 } else if (ni->is_cond_jump()) {
98 return nativeGeneralJump_at(addr())->jump_destination() + adj;
99 } else if (ni->is_mov_literal64()) {
100 return (address) ((NativeMovConstReg*)ni)->data();
101 } else {
102 ShouldNotReachHere();
103 return NULL;
104 }
105 }
108 void Relocation::pd_set_call_destination(address x) {
109 NativeInstruction* ni = nativeInstruction_at(addr());
110 if (ni->is_call()) {
111 nativeCall_at(addr())->set_destination(x);
112 } else if (ni->is_jump()) {
113 NativeJump* nj = nativeJump_at(addr());
115 // Unresolved jumps are recognized by a destination of -1
116 // However 64bit can't actually produce such an address
117 // and encodes a jump to self but jump_destination will
118 // return a -1 as the signal. We must not relocate this
119 // jmp or the ic code will not see it as unresolved.
121 if (nj->jump_destination() == (address) -1) {
122 x = addr(); // jump to self
123 }
124 nj->set_jump_destination(x);
125 } else if (ni->is_cond_jump()) {
126 // %%%% kludge this, for now, until we get a jump_destination method
127 address old_dest = nativeGeneralJump_at(addr())->jump_destination();
128 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
129 *(jint*)disp += (x - old_dest);
130 } else if (ni->is_mov_literal64()) {
131 ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
132 } else {
133 ShouldNotReachHere();
134 }
135 }
138 address* Relocation::pd_address_in_code() {
139 // All embedded Intel addresses are stored in 32-bit words.
140 // Since the addr points at the start of the instruction,
141 // we must parse the instruction a bit to find the embedded word.
142 assert(is_data(), "must be a DataRelocation");
143 typedef Assembler::WhichOperand WhichOperand;
144 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
145 #ifdef AMD64
146 assert(which == Assembler::disp32_operand ||
147 which == Assembler::call32_operand ||
148 which == Assembler::imm_operand, "format unpacks ok");
149 if (which != Assembler::imm_operand) {
150 // The "address" in the code is a displacement can't return it as
151 // and address* since it is really a jint*
152 ShouldNotReachHere();
153 return NULL;
154 }
155 #else
156 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok");
157 #endif // AMD64
158 return (address*) Assembler::locate_operand(addr(), which);
159 }
162 address Relocation::pd_get_address_from_code() {
163 #ifdef AMD64
164 // All embedded Intel addresses are stored in 32-bit words.
165 // Since the addr points at the start of the instruction,
166 // we must parse the instruction a bit to find the embedded word.
167 assert(is_data(), "must be a DataRelocation");
168 typedef Assembler::WhichOperand WhichOperand;
169 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
170 assert(which == Assembler::disp32_operand ||
171 which == Assembler::call32_operand ||
172 which == Assembler::imm_operand, "format unpacks ok");
173 if (which != Assembler::imm_operand) {
174 address ip = addr();
175 address disp = Assembler::locate_operand(ip, which);
176 address next_ip = Assembler::locate_next_instruction(ip);
177 address a = next_ip + *(int32_t*) disp;
178 return a;
179 }
180 #endif // AMD64
181 return *pd_address_in_code();
182 }
184 int Relocation::pd_breakpoint_size() {
185 // minimum breakpoint size, in short words
186 return NativeIllegalInstruction::instruction_size / sizeof(short);
187 }
189 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
190 Untested("pd_swap_in_breakpoint");
191 if (instrs != NULL) {
192 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
193 for (int i = 0; i < instrlen; i++) {
194 instrs[i] = ((short*)x)[i];
195 }
196 }
197 NativeIllegalInstruction::insert(x);
198 }
201 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
202 Untested("pd_swap_out_breakpoint");
203 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
204 NativeInstruction* ni = nativeInstruction_at(x);
205 *(short*)ni->addr_at(0) = instrs[0];
206 }
208 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
209 #ifdef _LP64
210 if (!Assembler::is_polling_page_far()) {
211 typedef Assembler::WhichOperand WhichOperand;
212 WhichOperand which = (WhichOperand) format();
213 // This format is imm but it is really disp32
214 which = Assembler::disp32_operand;
215 address orig_addr = old_addr_for(addr(), src, dest);
216 NativeInstruction* oni = nativeInstruction_at(orig_addr);
217 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
218 // This poll_addr is incorrect by the size of the instruction it is irrelevant
219 intptr_t poll_addr = (intptr_t)oni + *orig_disp;
221 NativeInstruction* ni = nativeInstruction_at(addr());
222 intptr_t new_disp = poll_addr - (intptr_t) ni;
224 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
225 * disp = (int32_t)new_disp;
226 }
227 #endif // _LP64
228 }
230 void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
231 #ifdef _LP64
232 if (!Assembler::is_polling_page_far()) {
233 typedef Assembler::WhichOperand WhichOperand;
234 WhichOperand which = (WhichOperand) format();
235 // This format is imm but it is really disp32
236 which = Assembler::disp32_operand;
237 address orig_addr = old_addr_for(addr(), src, dest);
238 NativeInstruction* oni = nativeInstruction_at(orig_addr);
239 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
240 // This poll_addr is incorrect by the size of the instruction it is irrelevant
241 intptr_t poll_addr = (intptr_t)oni + *orig_disp;
243 NativeInstruction* ni = nativeInstruction_at(addr());
244 intptr_t new_disp = poll_addr - (intptr_t) ni;
246 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
247 * disp = (int32_t)new_disp;
248 }
249 #endif // _LP64
250 }
252 void metadata_Relocation::pd_fix_value(address x) {
253 }