1 /*
2 * Copyright (c) 2000, 2010, 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
39
40
41 //-----------------------------------------------------
42
43 // Convert method signature into an array of BasicTypes for the arguments
44 BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {
45 ciSignature* sig = method->signature();
46 BasicTypeList* sta = new BasicTypeList(method->arg_size());
47 // add receiver, if any
48 if (!method->is_static()) sta->append(T_OBJECT);
49 // add remaining arguments
50 for (int i = 0; i < sig->count(); i++) {
51 ciType* type = sig->type_at(i);
52 BasicType t = type->basic_type();
53 if (t == T_ARRAY) {
54 t = T_OBJECT;
55 }
56 sta->append(t);
57 }
58 // done
59 return sta;
60 }
61
62
63 CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {
64 // compute the size of the arguments first. The signature array
65 // that java_calling_convention takes includes a T_VOID after double
66 // work items but our signatures do not.
67 int i;
68 int sizeargs = 0;
69 for (i = 0; i < signature->length(); i++) {
70 sizeargs += type2size[signature->at(i)];
71 }
72
73 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
74 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
75 int sig_index = 0;
76 for (i = 0; i < sizeargs; i++, sig_index++) {
77 sig_bt[i] = signature->at(sig_index);
78 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
79 sig_bt[i + 1] = T_VOID;
80 i++;
81 }
82 }
83
84 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);
85 LIR_OprList* args = new LIR_OprList(signature->length());
86 for (i = 0; i < sizeargs;) {
87 BasicType t = sig_bt[i];
88 assert(t != T_VOID, "should be skipping these");
89
90 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
91 args->append(opr);
92 if (opr->is_address()) {
93 LIR_Address* addr = opr->as_address_ptr();
94 assert(addr->disp() == (int)addr->disp(), "out of range value");
95 out_preserve = MAX2(out_preserve, (intptr_t)addr->disp() / 4);
96 }
97 i += type2size[t];
98 }
99 assert(args->length() == signature->length(), "size mismatch");
100 out_preserve += SharedRuntime::out_preserve_stack_slots();
101
102 if (outgoing) {
103 // update the space reserved for arguments.
104 update_reserved_argument_area_size(out_preserve * BytesPerWord);
105 }
106 return new CallingConvention(args, out_preserve);
107 }
108
109
110 CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {
111 // compute the size of the arguments first. The signature array
112 // that java_calling_convention takes includes a T_VOID after double
113 // work items but our signatures do not.
114 int i;
115 int sizeargs = 0;
116 for (i = 0; i < signature->length(); i++) {
117 sizeargs += type2size[signature->at(i)];
118 }
119
120 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
121 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
122 int sig_index = 0;
123 for (i = 0; i < sizeargs; i++, sig_index++) {
124 sig_bt[i] = signature->at(sig_index);
125 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
126 sig_bt[i + 1] = T_VOID;
127 i++;
128 }
129 }
130
131 intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, sizeargs);
132 LIR_OprList* args = new LIR_OprList(signature->length());
133 for (i = 0; i < sizeargs;) {
134 BasicType t = sig_bt[i];
135 assert(t != T_VOID, "should be skipping these");
136
137 // C calls are always outgoing
138 bool outgoing = true;
139 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
140 // they might be of different types if for instance floating point
141 // values are passed in cpu registers, but the sizes must match.
142 assert(type2size[opr->type()] == type2size[t], "type mismatch");
143 args->append(opr);
144 if (opr->is_address()) {
145 LIR_Address* addr = opr->as_address_ptr();
146 out_preserve = MAX2(out_preserve, (intptr_t)addr->disp() / 4);
147 }
148 i += type2size[t];
149 }
150 assert(args->length() == signature->length(), "size mismatch");
151 out_preserve += SharedRuntime::out_preserve_stack_slots();
152 update_reserved_argument_area_size(out_preserve * BytesPerWord);
153 return new CallingConvention(args, out_preserve);
154 }
155
156
157 //--------------------------------------------------------
158 // FrameMap
159 //--------------------------------------------------------
160
161 bool FrameMap::_init_done = false;
162 Register FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];
163 int FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];
164
165
166 FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {
167 assert(_init_done, "should already be completed");
168
169 _framesize = -1;
170 _num_spills = -1;
171
172 assert(monitors >= 0, "not set");
173 _num_monitors = monitors;
174 assert(reserved_argument_area_size >= 0, "not set");
175 _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;
176
177 _argcount = method->arg_size();
178 _argument_locations = new intArray(_argcount, -1);
179 _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);
180 _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();
181
182 int java_index = 0;
183 for (int i = 0; i < _incoming_arguments->length(); i++) {
184 LIR_Opr opr = _incoming_arguments->at(i);
185 if (opr->is_address()) {
186 LIR_Address* address = opr->as_address_ptr();
187 _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);
188 _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));
189 }
190 java_index += type2size[opr->type()];
191 }
192
193 }
194
195
196 bool FrameMap::finalize_frame(int nof_slots) {
197 assert(nof_slots >= 0, "must be positive");
198 assert(_num_spills == -1, "can only be set once");
199 _num_spills = nof_slots;
200 assert(_framesize == -1, "should only be calculated once");
201 _framesize = round_to(in_bytes(sp_offset_for_monitor_base(0)) +
202 _num_monitors * sizeof(BasicObjectLock) +
203 sizeof(intptr_t) + // offset of deopt orig pc
204 frame_pad_in_bytes,
205 StackAlignmentInBytes) / 4;
206 int java_index = 0;
207 for (int i = 0; i < _incoming_arguments->length(); i++) {
208 LIR_Opr opr = _incoming_arguments->at(i);
209 if (opr->is_stack()) {
210 _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +
211 _argument_locations->at(java_index));
212 }
213 java_index += type2size[opr->type()];
214 }
215 // make sure it's expressible on the platform
216 return validate_frame();
217 }
218
219 VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {
220 int offset_in_bytes = in_bytes(offset);
221 assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");
222 assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");
223 return VMRegImpl::stack2reg(offset_in_bytes / 4);
224 }
225
226
227 bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,
228 Location::Type loc_type,
229 Location* loc) const {
230 int offset = in_bytes(byte_offset_from_sp);
231 assert(offset >= 0, "incorrect offset");
232 if (!Location::legal_offset_in_bytes(offset)) {
233 return false;
234 }
235 Location tmp_loc = Location::new_stk_loc(loc_type, offset);
236 *loc = tmp_loc;
237 return true;
238 }
239
240
241 bool FrameMap::locations_for_slot (int index, Location::Type loc_type,
242 Location* loc, Location* second) const {
243 ByteSize offset_from_sp = sp_offset_for_slot(index);
244 if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {
245 return false;
246 }
247 if (second != NULL) {
248 // two word item
249 offset_from_sp = offset_from_sp + in_ByteSize(4);
250 return location_for_sp_offset(offset_from_sp, loc_type, second);
251 }
252 return true;
253 }
254
255 //////////////////////
256 // Public accessors //
257 //////////////////////
258
259
260 ByteSize FrameMap::sp_offset_for_slot(const int index) const {
261 if (index < argcount()) {
262 int offset = _argument_locations->at(index);
263 assert(offset != -1, "not a memory argument");
264 assert(offset >= framesize() * 4, "argument inside of frame");
265 return in_ByteSize(offset);
266 }
267 ByteSize offset = sp_offset_for_spill(index - argcount());
268 assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");
269 return offset;
270 }
271
272
273 ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {
274 ByteSize offset = sp_offset_for_slot(index);
275 if (index >= argcount()) {
276 assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");
277 }
278 return offset;
279 }
280
281
282 ByteSize FrameMap::sp_offset_for_spill(const int index) const {
283 assert(index >= 0 && index < _num_spills, "out of range");
284 int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
285 index * spill_slot_size_in_bytes;
286 return in_ByteSize(offset);
287 }
288
289 ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {
290 int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
291 _num_spills * spill_slot_size_in_bytes;
292 int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);
293 return in_ByteSize(offset);
294 }
295
296 ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {
297 check_monitor_index(index);
298 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;
299 }
300
301 ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {
302 check_monitor_index(index);
303 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());
304 }
305
306 void FrameMap::print_frame_layout() const {
307 int svar;
308 tty->print_cr("#####################################");
309 tty->print_cr("Frame size in words %d", framesize());
310
311 if( _num_monitors > 0) {
312 tty->print_cr("monitor [0]:%d | [%2d]:%d",
313 in_bytes(sp_offset_for_monitor_base(0)),
314 in_bytes(sp_offset_for_monitor_base(_num_monitors)));
315 }
316 if( _num_spills > 0) {
317 svar = _num_spills - 1;
318 if(svar == 0)
319 tty->print_cr("spill [0]:%d", in_bytes(sp_offset_for_spill(0)));
320 else
321 tty->print_cr("spill [0]:%d | [%2d]:%d", in_bytes(sp_offset_for_spill(0)),
322 svar,
323 in_bytes(sp_offset_for_spill(svar)));
324 }
325 }
326
327
328 // For OopMaps, map a local variable or spill index to an VMReg.
329 // This is the offset from sp() in the frame of the slot for the index,
330 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
331 //
332 // C ABI size +
333 // framesize + framesize +
334 // stack0 stack0 stack0 0 <- VMReg->value()
335 // | | | <registers> |
336 // ..........|..............|..............|.............|
337 // 0 1 2 3 | <C ABI area> | 4 5 6 ...... | <- local indices
338 // ^ ^ sp()
339 // | |
340 // arguments non-argument locals
341
342
343 VMReg FrameMap::regname(LIR_Opr opr) const {
344 if (opr->is_single_cpu()) {
345 assert(!opr->is_virtual(), "should not see virtual registers here");
346 return opr->as_register()->as_VMReg();
347 } else if (opr->is_single_stack()) {
348 return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
349 } else if (opr->is_address()) {
350 LIR_Address* addr = opr->as_address_ptr();
351 assert(addr->base() == stack_pointer(), "sp based addressing only");
352 return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
353 }
354 ShouldNotReachHere();
355 return VMRegImpl::Bad();
356 }
357
358
359
360
361 // ------------ extra spill slots ---------------