1 /*
2 * Copyright (c) 2000, 2008, 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 "incls/_precompiled.incl"
26 # include "incls/_c1_FrameMap.cpp.incl"
27
28
29
30 //-----------------------------------------------------
31
32 // Convert method signature into an array of BasicTypes for the arguments
33 BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {
34 ciSignature* sig = method->signature();
35 BasicTypeList* sta = new BasicTypeList(method->arg_size());
36 // add receiver, if any
37 if (!method->is_static()) sta->append(T_OBJECT);
38 // add remaining arguments
39 for (int i = 0; i < sig->count(); i++) {
40 ciType* type = sig->type_at(i);
41 BasicType t = type->basic_type();
42 if (t == T_ARRAY) {
43 t = T_OBJECT;
44 }
45 sta->append(t);
46 }
47 // done
48 return sta;
49 }
50
51
52 CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {
53 // compute the size of the arguments first. The signature array
54 // that java_calling_convention takes includes a T_VOID after double
55 // work items but our signatures do not.
56 int i;
57 int sizeargs = 0;
58 for (i = 0; i < signature->length(); i++) {
59 sizeargs += type2size[signature->at(i)];
60 }
61
62 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
63 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
64 int sig_index = 0;
65 for (i = 0; i < sizeargs; i++, sig_index++) {
66 sig_bt[i] = signature->at(sig_index);
67 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
68 sig_bt[i + 1] = T_VOID;
69 i++;
70 }
71 }
72
73 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);
74 LIR_OprList* args = new LIR_OprList(signature->length());
75 for (i = 0; i < sizeargs;) {
76 BasicType t = sig_bt[i];
77 assert(t != T_VOID, "should be skipping these");
78
79 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
80 args->append(opr);
81 if (opr->is_address()) {
82 LIR_Address* addr = opr->as_address_ptr();
83 assert(addr->disp() == (int)addr->disp(), "out of range value");
84 out_preserve = MAX2(out_preserve, (intptr_t)addr->disp() / 4);
85 }
86 i += type2size[t];
87 }
88 assert(args->length() == signature->length(), "size mismatch");
89 out_preserve += SharedRuntime::out_preserve_stack_slots();
90
91 if (outgoing) {
92 // update the space reserved for arguments.
93 update_reserved_argument_area_size(out_preserve);
94 }
95 return new CallingConvention(args, out_preserve);
96 }
97
98
99 CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {
100 // compute the size of the arguments first. The signature array
101 // that java_calling_convention takes includes a T_VOID after double
102 // work items but our signatures do not.
103 int i;
104 int sizeargs = 0;
105 for (i = 0; i < signature->length(); i++) {
106 sizeargs += type2size[signature->at(i)];
107 }
108
109 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
110 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
111 int sig_index = 0;
112 for (i = 0; i < sizeargs; i++, sig_index++) {
113 sig_bt[i] = signature->at(sig_index);
114 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
115 sig_bt[i + 1] = T_VOID;
116 i++;
117 }
118 }
119
120 intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, sizeargs);
121 LIR_OprList* args = new LIR_OprList(signature->length());
122 for (i = 0; i < sizeargs;) {
123 BasicType t = sig_bt[i];
124 assert(t != T_VOID, "should be skipping these");
125
126 // C calls are always outgoing
127 bool outgoing = true;
128 LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
129 // they might be of different types if for instance floating point
130 // values are passed in cpu registers, but the sizes must match.
131 assert(type2size[opr->type()] == type2size[t], "type mismatch");
132 args->append(opr);
133 if (opr->is_address()) {
134 LIR_Address* addr = opr->as_address_ptr();
135 out_preserve = MAX2(out_preserve, (intptr_t)addr->disp() / 4);
136 }
137 i += type2size[t];
138 }
139 assert(args->length() == signature->length(), "size mismatch");
140 out_preserve += SharedRuntime::out_preserve_stack_slots();
141 update_reserved_argument_area_size(out_preserve);
142 return new CallingConvention(args, out_preserve);
143 }
144
145
146 //--------------------------------------------------------
147 // FrameMap
148 //--------------------------------------------------------
149
150 bool FrameMap::_init_done = false;
151 Register FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];
152 int FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];
153
154
155 FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {
156 if (!_init_done) init();
157
158 _framesize = -1;
159 _num_spills = -1;
160
161 assert(monitors >= 0, "not set");
162 _num_monitors = monitors;
163 assert(reserved_argument_area_size >= 0, "not set");
164 _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;
165
166 _argcount = method->arg_size();
167 _argument_locations = new intArray(_argcount, -1);
168 _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);
169 _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();
170
171 int java_index = 0;
172 for (int i = 0; i < _incoming_arguments->length(); i++) {
173 LIR_Opr opr = _incoming_arguments->at(i);
174 if (opr->is_address()) {
175 LIR_Address* address = opr->as_address_ptr();
176 _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);
177 _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));
178 }
179 java_index += type2size[opr->type()];
180 }
181
182 }
183
184
185 bool FrameMap::finalize_frame(int nof_slots) {
186 assert(nof_slots >= 0, "must be positive");
187 assert(_num_spills == -1, "can only be set once");
188 _num_spills = nof_slots;
189 assert(_framesize == -1, "should only be calculated once");
190 _framesize = round_to(in_bytes(sp_offset_for_monitor_base(0)) +
191 _num_monitors * sizeof(BasicObjectLock) +
192 sizeof(intptr_t) + // offset of deopt orig pc
193 frame_pad_in_bytes,
194 StackAlignmentInBytes) / 4;
195 int java_index = 0;
196 for (int i = 0; i < _incoming_arguments->length(); i++) {
197 LIR_Opr opr = _incoming_arguments->at(i);
198 if (opr->is_stack()) {
199 _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +
200 _argument_locations->at(java_index));
201 }
202 java_index += type2size[opr->type()];
203 }
204 // make sure it's expressible on the platform
205 return validate_frame();
206 }
207
208 VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {
209 int offset_in_bytes = in_bytes(offset);
210 assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");
211 assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");
212 return VMRegImpl::stack2reg(offset_in_bytes / 4);
213 }
214
215
216 bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,
217 Location::Type loc_type,
218 Location* loc) const {
219 int offset = in_bytes(byte_offset_from_sp);
220 assert(offset >= 0, "incorrect offset");
221 if (!Location::legal_offset_in_bytes(offset)) {
222 return false;
223 }
224 Location tmp_loc = Location::new_stk_loc(loc_type, offset);
225 *loc = tmp_loc;
226 return true;
227 }
228
229
230 bool FrameMap::locations_for_slot (int index, Location::Type loc_type,
231 Location* loc, Location* second) const {
232 ByteSize offset_from_sp = sp_offset_for_slot(index);
233 if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {
234 return false;
235 }
236 if (second != NULL) {
237 // two word item
238 offset_from_sp = offset_from_sp + in_ByteSize(4);
239 return location_for_sp_offset(offset_from_sp, loc_type, second);
240 }
241 return true;
242 }
243
244 //////////////////////
245 // Public accessors //
246 //////////////////////
247
248
249 ByteSize FrameMap::sp_offset_for_slot(const int index) const {
250 if (index < argcount()) {
251 int offset = _argument_locations->at(index);
252 assert(offset != -1, "not a memory argument");
253 assert(offset >= framesize() * 4, "argument inside of frame");
254 return in_ByteSize(offset);
255 }
256 ByteSize offset = sp_offset_for_spill(index - argcount());
257 assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");
258 return offset;
259 }
260
261
262 ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {
263 ByteSize offset = sp_offset_for_slot(index);
264 if (index >= argcount()) {
265 assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");
266 }
267 return offset;
268 }
269
270
271 ByteSize FrameMap::sp_offset_for_spill(const int index) const {
272 assert(index >= 0 && index < _num_spills, "out of range");
273 int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
274 index * spill_slot_size_in_bytes;
275 return in_ByteSize(offset);
276 }
277
278 ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {
279 int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
280 _num_spills * spill_slot_size_in_bytes;
281 int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);
282 return in_ByteSize(offset);
283 }
284
285 ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {
286 check_monitor_index(index);
287 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;
288 }
289
290 ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {
291 check_monitor_index(index);
292 return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());
293 }
294
295 void FrameMap::print_frame_layout() const {
296 int svar;
297 tty->print_cr("#####################################");
298 tty->print_cr("Frame size in words %d", framesize());
299
300 if( _num_monitors > 0) {
301 tty->print_cr("monitor [0]:%d | [%2d]:%d",
302 in_bytes(sp_offset_for_monitor_base(0)),
303 in_bytes(sp_offset_for_monitor_base(_num_monitors)));
304 }
305 if( _num_spills > 0) {
306 svar = _num_spills - 1;
307 if(svar == 0)
308 tty->print_cr("spill [0]:%d", in_bytes(sp_offset_for_spill(0)));
309 else
310 tty->print_cr("spill [0]:%d | [%2d]:%d", in_bytes(sp_offset_for_spill(0)),
311 svar,
312 in_bytes(sp_offset_for_spill(svar)));
313 }
314 }
315
316
317 // For OopMaps, map a local variable or spill index to an VMReg.
318 // This is the offset from sp() in the frame of the slot for the index,
319 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
320 //
321 // C ABI size +
322 // framesize + framesize +
323 // stack0 stack0 stack0 0 <- VMReg->value()
324 // | | | <registers> |
325 // ..........|..............|..............|.............|
326 // 0 1 2 3 | <C ABI area> | 4 5 6 ...... | <- local indices
327 // ^ ^ sp()
328 // | |
329 // arguments non-argument locals
330
331
332 VMReg FrameMap::regname(LIR_Opr opr) const {
333 if (opr->is_single_cpu()) {
334 assert(!opr->is_virtual(), "should not see virtual registers here");
335 return opr->as_register()->as_VMReg();
336 } else if (opr->is_single_stack()) {
337 return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
338 } else if (opr->is_address()) {
339 LIR_Address* addr = opr->as_address_ptr();
340 assert(addr->base() == stack_pointer(), "sp based addressing only");
341 return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
342 }
343 ShouldNotReachHere();
344 return VMRegImpl::Bad();
345 }
346
347
348
349
350 // ------------ extra spill slots ---------------