1 /*
2 * Copyright (c) 2000, 2013, 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 "c1/c1_FrameMap.hpp"
27 #include "c1/c1_LIR.hpp"
28 #include "runtime/sharedRuntime.hpp"
29 #ifdef TARGET_ARCH_x86
30 # include "vmreg_x86.inline.hpp"
31 #endif
32 #ifdef TARGET_ARCH_sparc
33 # include "vmreg_sparc.inline.hpp"
34 #endif
35 #ifdef TARGET_ARCH_zero
36 # include "vmreg_zero.inline.hpp"
37 #endif
38 #ifdef TARGET_ARCH_arm
39 # include "vmreg_arm.inline.hpp"
40 #endif
41 #ifdef TARGET_ARCH_ppc
42 # include "vmreg_ppc.inline.hpp"
43 #endif
44
45
46
47 //-----------------------------------------------------
48
49 // Convert method signature into an array of BasicTypes for the arguments
50 BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {
51 ciSignature* sig = method->signature();
52 BasicTypeList* sta = new BasicTypeList(method->arg_size());
53 // add receiver, if any
54 if (!method->is_static()) sta->append(T_OBJECT);
55 // add remaining arguments
56 for (int i = 0; i < sig->count(); i++) {
57 ciType* type = sig->type_at(i);
58 BasicType t = type->basic_type();
59 if (t == T_ARRAY) {
60 t = T_OBJECT;
61 }
62 sta->append(t);
63 }
64 // done
65 return sta;
66 }
67
68
69 CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {
70 // compute the size of the arguments first. The signature array
71 // that java_calling_convention takes includes a T_VOID after double
72 // work items but our signatures do not.
73 int i;
74 int sizeargs = 0;
75 for (i = 0; i < signature->length(); i++) {
76 sizeargs += type2size[signature->at(i)];
77 }
78
79 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
80 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
81 int sig_index = 0;
82 for (i = 0; i < sizeargs; i++, sig_index++) {
83 sig_bt[i] = signature->at(sig_index);
84 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
85 sig_bt[i + 1] = T_VOID;
86 i++;
87 }
88 }
89
90 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);
91 LIR_OprList* args = new LIR_OprList(signature->length());
92 for (i = 0; i < sizeargs;) {
93 BasicType t = sig_bt[i];
94 assert(t != T_VOID, "should be skipping these");
95 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
96 args->append(opr);
97 if (opr->is_address()) {
98 LIR_Address* addr = opr->as_address_ptr();
99 assert(addr->disp() == (int)addr->disp(), "out of range value");
100 out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);
101 }
102 i += type2size[t];
103 }
104 assert(args->length() == signature->length(), "size mismatch");
105 out_preserve += SharedRuntime::out_preserve_stack_slots();
106
107 if (outgoing) {
108 // update the space reserved for arguments.
109 update_reserved_argument_area_size(out_preserve * BytesPerWord);
110 }
111 return new CallingConvention(args, out_preserve);
112 }
113
114
115 CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {
116 // compute the size of the arguments first. The signature array
117 // that java_calling_convention takes includes a T_VOID after double
118 // work items but our signatures do not.
119 int i;
120 int sizeargs = 0;
121 for (i = 0; i < signature->length(); i++) {
122 sizeargs += type2size[signature->at(i)];
123 }
124
125 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
126 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
127 int sig_index = 0;
128 for (i = 0; i < sizeargs; i++, sig_index++) {
129 sig_bt[i] = signature->at(sig_index);
130 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
131 sig_bt[i + 1] = T_VOID;
132 i++;
133 }
134 }
135
136 intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, NULL, sizeargs);
137 LIR_OprList* args = new LIR_OprList(signature->length());
138 for (i = 0; i < sizeargs;) {
139 BasicType t = sig_bt[i];
140 assert(t != T_VOID, "should be skipping these");
141
142 // C calls are always outgoing
143 bool outgoing = true;
144 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
145 // they might be of different types if for instance floating point
146 // values are passed in cpu registers, but the sizes must match.
147 assert(type2size[opr->type()] == type2size[t], "type mismatch");
148 args->append(opr);
149 if (opr->is_address()) {
150 LIR_Address* addr = opr->as_address_ptr();
151 out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);
152 }
153 i += type2size[t];
154 }
155 assert(args->length() == signature->length(), "size mismatch");
156 out_preserve += SharedRuntime::out_preserve_stack_slots();
157 update_reserved_argument_area_size(out_preserve * BytesPerWord);
158 return new CallingConvention(args, out_preserve);
159 }
160
161
162 //--------------------------------------------------------
163 // FrameMap
164 //--------------------------------------------------------
165
166 bool FrameMap::_init_done = false;
167 Register FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];
168 int FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];
169
170
171 FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {
172 assert(_init_done, "should already be completed");
173
174 _framesize = -1;
175 _num_spills = -1;
176
177 assert(monitors >= 0, "not set");
178 _num_monitors = monitors;
179 assert(reserved_argument_area_size >= 0, "not set");
180 _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;
181
182 _argcount = method->arg_size();
183 _argument_locations = new intArray(_argcount, -1);
184 _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);
185 _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();
186
187 int java_index = 0;
188 for (int i = 0; i < _incoming_arguments->length(); i++) {
189 LIR_Opr opr = _incoming_arguments->at(i);
190 if (opr->is_address()) {
191 LIR_Address* address = opr->as_address_ptr();
192 _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);
193 _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));
194 }
195 java_index += type2size[opr->type()];
196 }
197
198 }
199
200
201 bool FrameMap::finalize_frame(int nof_slots) {
202 assert(nof_slots >= 0, "must be positive");
203 assert(_num_spills == -1, "can only be set once");
204 _num_spills = nof_slots;
205 assert(_framesize == -1, "should only be calculated once");
206 _framesize = round_to(in_bytes(sp_offset_for_monitor_base(0)) +
207 _num_monitors * sizeof(BasicObjectLock) +
208 sizeof(intptr_t) + // offset of deopt orig pc
209 frame_pad_in_bytes,
210 StackAlignmentInBytes) / 4;
211 int java_index = 0;
212 for (int i = 0; i < _incoming_arguments->length(); i++) {
213 LIR_Opr opr = _incoming_arguments->at(i);
214 if (opr->is_stack()) {
215 _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +
216 _argument_locations->at(java_index));
217 }
218 java_index += type2size[opr->type()];
219 }
220 // make sure it's expressible on the platform
221 return validate_frame();
222 }
223
224 VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {
225 int offset_in_bytes = in_bytes(offset);
226 assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");
227 assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");
228 return VMRegImpl::stack2reg(offset_in_bytes / 4);
229 }
230
231
232 bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,
233 Location::Type loc_type,
234 Location* loc) const {
235 int offset = in_bytes(byte_offset_from_sp);
236 assert(offset >= 0, "incorrect offset");
237 if (!Location::legal_offset_in_bytes(offset)) {
238 return false;
239 }
240 Location tmp_loc = Location::new_stk_loc(loc_type, offset);
241 *loc = tmp_loc;
242 return true;
243 }
244
245
246 bool FrameMap::locations_for_slot (int index, Location::Type loc_type,
247 Location* loc, Location* second) const {
248 ByteSize offset_from_sp = sp_offset_for_slot(index);
249 if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {
250 return false;
251 }
252 if (second != NULL) {
253 // two word item
254 offset_from_sp = offset_from_sp + in_ByteSize(4);
255 return location_for_sp_offset(offset_from_sp, loc_type, second);
256 }
257 return true;
258 }
259
260 //////////////////////
261 // Public accessors //
262 //////////////////////
263
264
265 ByteSize FrameMap::sp_offset_for_slot(const int index) const {
266 if (index < argcount()) {
267 int offset = _argument_locations->at(index);
268 assert(offset != -1, "not a memory argument");
269 assert(offset >= framesize() * 4, "argument inside of frame");
270 return in_ByteSize(offset);
271 }
272 ByteSize offset = sp_offset_for_spill(index - argcount());
273 assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");
274 return offset;
275 }
276
277
278 ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {
279 ByteSize offset = sp_offset_for_slot(index);
280 if (index >= argcount()) {
281 assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");
282 }
283 return offset;
284 }
285
286
287 ByteSize FrameMap::sp_offset_for_spill(const int index) const {
288 assert(index >= 0 && index < _num_spills, "out of range");
289 int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
290 index * spill_slot_size_in_bytes;
291 return in_ByteSize(offset);
292 }
293
294 ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {
295 int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
296 _num_spills * spill_slot_size_in_bytes;
297 int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);
298 return in_ByteSize(offset);
299 }
300
301 ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {
302 check_monitor_index(index);
303 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;
304 }
305
306 ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {
307 check_monitor_index(index);
308 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());
309 }
310
311
312 // For OopMaps, map a local variable or spill index to an VMReg.
313 // This is the offset from sp() in the frame of the slot for the index,
314 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
315 //
316 // C ABI size +
317 // framesize + framesize +
318 // stack0 stack0 stack0 0 <- VMReg->value()
319 // | | | <registers> |
320 // ..........|..............|..............|.............|
321 // 0 1 2 3 | <C ABI area> | 4 5 6 ...... | <- local indices
322 // ^ ^ sp()
323 // | |
324 // arguments non-argument locals
325
326
327 VMReg FrameMap::regname(LIR_Opr opr) const {
328 if (opr->is_single_cpu()) {
329 assert(!opr->is_virtual(), "should not see virtual registers here");
330 return opr->as_register().as_VMReg();
331 } else if (opr->is_single_stack()) {
332 return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
333 } else if (opr->is_address()) {
334 LIR_Address* addr = opr->as_address_ptr();
335 assert(addr->base() == stack_pointer(), "sp based addressing only");
336 return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
337 }
338 ShouldNotReachHere();
339 return VMRegImpl::Bad();
340 }
341
342
343
344
345 // ------------ extra spill slots ---------------