c1_FrameMap.cpp revision 1472:c18cbe5936b8 
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
33BasicTypeArray* 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
52CallingConvention* 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
99CallingConvention* 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
150bool      FrameMap::_init_done = false;
151Register  FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];
152int       FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];
153
154
155FrameMap::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
185bool 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
208VMReg 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
216bool 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
230bool 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
249ByteSize 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
262ByteSize 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
271ByteSize 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
278ByteSize 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
285ByteSize 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
290ByteSize 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
295void 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
332VMReg 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 ---------------
351