1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
|
from rpython.jit.backend.ppc.regalloc import (PPCFrameManager,
Regalloc, PPCRegisterManager)
from rpython.jit.backend.ppc.opassembler import OpAssembler
from rpython.jit.backend.ppc.codebuilder import (PPCBuilder, OverwritingBuilder,
scratch_reg)
from rpython.jit.backend.ppc.arch import (IS_PPC_32, IS_PPC_64, WORD,
LR_BC_OFFSET, REGISTERS_SAVED,
GPR_SAVE_AREA_OFFSET,
THREADLOCAL_ADDR_OFFSET,
STD_FRAME_SIZE_IN_BYTES,
IS_BIG_ENDIAN,
LOCAL_VARS_OFFSET)
from rpython.jit.backend.ppc.helper.assembler import Saved_Volatiles
from rpython.jit.backend.ppc.helper.regalloc import _check_imm_arg
import rpython.jit.backend.ppc.register as r
import rpython.jit.backend.ppc.condition as c
from rpython.jit.metainterp.compile import ResumeGuardDescr
from rpython.jit.backend.ppc.register import JITFRAME_FIXED_SIZE
from rpython.jit.metainterp.history import AbstractFailDescr
from rpython.jit.backend.llsupport import jitframe, rewrite
from rpython.jit.backend.llsupport.asmmemmgr import MachineDataBlockWrapper
from rpython.jit.backend.llsupport.assembler import (DEBUG_COUNTER, debug_bridge,
BaseAssembler)
from rpython.jit.backend.model import CompiledLoopToken
from rpython.rtyper.lltypesystem import lltype, rffi, llmemory
from rpython.jit.metainterp.resoperation import rop, ResOperation
from rpython.jit.codewriter import longlong
from rpython.jit.metainterp.history import (INT, REF, FLOAT)
from rpython.rlib.debug import (debug_print, debug_start, debug_stop,
have_debug_prints)
from rpython.rlib import rgc
from rpython.rtyper.annlowlevel import llhelper, cast_instance_to_gcref
from rpython.rlib.objectmodel import we_are_translated, specialize
from rpython.rtyper.lltypesystem.lloperation import llop
from rpython.jit.backend.ppc.locations import StackLocation, get_fp_offset, imm
from rpython.jit.backend.ppc import callbuilder
from rpython.rlib.jit import AsmInfo
from rpython.rlib.objectmodel import compute_unique_id
from rpython.rlib.rarithmetic import r_uint
from rpython.rlib.rjitlog import rjitlog as jl
from rpython.jit.backend.ppc.jump import remap_frame_layout_mixed
memcpy_fn = rffi.llexternal('memcpy', [llmemory.Address, llmemory.Address,
rffi.SIZE_T], lltype.Void,
sandboxsafe=True, _nowrapper=True)
DEBUG_COUNTER = lltype.Struct('DEBUG_COUNTER', ('i', lltype.Signed),
('type', lltype.Char), # 'b'ridge, 'l'abel or
# 'e'ntry point
('number', lltype.Signed))
def hi(w):
return w >> 16
def ha(w):
if (w >> 15) & 1:
return (w >> 16) + 1
else:
return w >> 16
def lo(w):
return w & 0x0000FFFF
def la(w):
v = w & 0x0000FFFF
if v & 0x8000:
return -((v ^ 0xFFFF) + 1) # "sign extend" to 32 bits
return v
def highest(w):
return w >> 48
def higher(w):
return (w >> 32) & 0x0000FFFF
def high(w):
return (w >> 16) & 0x0000FFFF
class JitFrameTooDeep(Exception):
pass
class AssemblerPPC(OpAssembler, BaseAssembler):
#ENCODING_AREA = FORCE_INDEX_OFS
#OFFSET_SPP_TO_GPR_SAVE_AREA = (FORCE_INDEX + FLOAT_INT_CONVERSION
# + ENCODING_AREA)
#OFFSET_SPP_TO_FPR_SAVE_AREA = (OFFSET_SPP_TO_GPR_SAVE_AREA
# + GPR_SAVE_AREA)
#OFFSET_SPP_TO_OLD_BACKCHAIN = (OFFSET_SPP_TO_GPR_SAVE_AREA
# + GPR_SAVE_AREA + FPR_SAVE_AREA)
#OFFSET_STACK_ARGS = OFFSET_SPP_TO_OLD_BACKCHAIN + BACKCHAIN_SIZE * WORD
#if IS_PPC_64:
# OFFSET_STACK_ARGS += MAX_REG_PARAMS * WORD
def __init__(self, cpu, translate_support_code=False):
BaseAssembler.__init__(self, cpu, translate_support_code)
self.loop_run_counters = []
self.wb_slowpath = [0, 0, 0, 0, 0]
self.setup_failure_recovery()
self.stack_check_slowpath = 0
self.propagate_exception_path = 0
self.teardown()
def set_debug(self, v):
self._debug = v
def _save_nonvolatiles(self):
""" save nonvolatile GPRs and FPRs in SAVE AREA
"""
for i, reg in enumerate(NONVOLATILES):
# save r31 later on
if reg.value == r.SPP.value:
continue
self.mc.store(reg.value, r.SPP.value,
self.OFFSET_SPP_TO_GPR_SAVE_AREA + WORD * i)
for i, reg in enumerate(NONVOLATILES_FLOAT):
self.mc.stfd(reg.value, r.SPP.value,
self.OFFSET_SPP_TO_FPR_SAVE_AREA + WORD * i)
def _restore_nonvolatiles(self, mc, spp_reg):
""" restore nonvolatile GPRs and FPRs from SAVE AREA
"""
for i, reg in enumerate(NONVOLATILES):
mc.load(reg.value, spp_reg.value,
self.OFFSET_SPP_TO_GPR_SAVE_AREA + WORD * i)
for i, reg in enumerate(NONVOLATILES_FLOAT):
mc.lfd(reg.value, spp_reg.value,
self.OFFSET_SPP_TO_FPR_SAVE_AREA + WORD * i)
def _call_header_shadowstack(self, gcrootmap):
# we need to put one word into the shadowstack: the jitframe (SPP)
mc = self.mc
diff = mc.load_imm_plus(r.RCS1, gcrootmap.get_root_stack_top_addr())
mc.load(r.RCS2.value, r.RCS1.value, diff) # ld RCS2, [rootstacktop]
#
mc.addi(r.RCS3.value, r.RCS2.value, WORD) # add RCS3, RCS2, WORD
mc.store(r.SPP.value, r.RCS2.value, 0) # std SPP, RCS2
#
mc.store(r.RCS3.value, r.RCS1.value, diff)# std RCS3, [rootstacktop]
def _call_footer_shadowstack(self, gcrootmap):
mc = self.mc
diff = mc.load_imm_plus(r.RCS1, gcrootmap.get_root_stack_top_addr())
mc.load(r.RCS2.value, r.RCS1.value, diff) # ld RCS2, [rootstacktop]
mc.subi(r.RCS2.value, r.RCS2.value, WORD) # sub RCS2, RCS2, WORD
mc.store(r.RCS2.value, r.RCS1.value, diff) # std RCS2, [rootstacktop]
def new_stack_loc(self, i, tp):
base_ofs = self.cpu.get_baseofs_of_frame_field()
return StackLocation(i, get_fp_offset(base_ofs, i), tp)
def setup_failure_recovery(self):
self.failure_recovery_code = [0, 0, 0, 0]
def _push_core_regs_to_jitframe(self, mc, includes=r.MANAGED_REGS):
base_ofs = self.cpu.get_baseofs_of_frame_field()
for reg in includes:
v = r.ALL_REG_INDEXES[reg]
mc.std(reg.value, r.SPP.value, base_ofs + v * WORD)
def _push_fp_regs_to_jitframe(self, mc, includes=r.MANAGED_FP_REGS):
base_ofs = self.cpu.get_baseofs_of_frame_field()
for reg in includes:
v = r.ALL_REG_INDEXES[reg]
mc.stfd(reg.value, r.SPP.value, base_ofs + v * WORD)
def _pop_core_regs_from_jitframe(self, mc, includes=r.MANAGED_REGS):
base_ofs = self.cpu.get_baseofs_of_frame_field()
for reg in includes:
v = r.ALL_REG_INDEXES[reg]
mc.ld(reg.value, r.SPP.value, base_ofs + v * WORD)
def _pop_fp_regs_from_jitframe(self, mc, includes=r.MANAGED_FP_REGS):
base_ofs = self.cpu.get_baseofs_of_frame_field()
for reg in includes:
v = r.ALL_REG_INDEXES[reg]
mc.lfd(reg.value, r.SPP.value, base_ofs + v * WORD)
def _build_failure_recovery(self, exc, withfloats=False):
mc = PPCBuilder()
self.mc = mc
# fill in the jf_descr and jf_gcmap fields of the frame according
# to which failure we are resuming from. These are set before
# this function is called (see generate_quick_failure()).
ofs = self.cpu.get_ofs_of_frame_field('jf_descr')
ofs2 = self.cpu.get_ofs_of_frame_field('jf_gcmap')
mc.store(r.r0.value, r.SPP.value, ofs)
mc.store(r.r2.value, r.SPP.value, ofs2)
self._push_core_regs_to_jitframe(mc)
if withfloats:
self._push_fp_regs_to_jitframe(mc)
if exc:
# We might have an exception pending.
mc.load_imm(r.r2, self.cpu.pos_exc_value())
# Copy it into 'jf_guard_exc'
offset = self.cpu.get_ofs_of_frame_field('jf_guard_exc')
mc.load(r.r0.value, r.r2.value, 0)
mc.store(r.r0.value, r.SPP.value, offset)
# Zero out the exception fields
diff = self.cpu.pos_exception() - self.cpu.pos_exc_value()
assert _check_imm_arg(diff)
mc.li(r.r0.value, 0)
mc.store(r.r0.value, r.r2.value, 0)
mc.store(r.r0.value, r.r2.value, diff)
# now we return from the complete frame, which starts from
# _call_header_with_stack_check(). The _call_footer below does it.
self._call_footer()
rawstart = mc.materialize(self.cpu, [])
self.failure_recovery_code[exc + 2 * withfloats] = rawstart
self.mc = None
def build_frame_realloc_slowpath(self):
mc = PPCBuilder()
self.mc = mc
# signature of this _frame_realloc_slowpath function:
# * on entry, r0 is the new size
# * on entry, r2 is the gcmap
# * no managed register must be modified
ofs2 = self.cpu.get_ofs_of_frame_field('jf_gcmap')
mc.store(r.r2.value, r.SPP.value, ofs2)
self._push_core_regs_to_jitframe(mc)
self._push_fp_regs_to_jitframe(mc)
# Save away the LR inside r30
mc.mflr(r.RCS1.value)
# First argument is SPP (= r31), which is the jitframe
mc.mr(r.r3.value, r.SPP.value)
# Second argument is the new size, which is still in r0 here
mc.mr(r.r4.value, r.r0.value)
# This trashes r0 and r2
self._store_and_reset_exception(mc, r.RCS2, r.RCS3)
# Do the call
adr = rffi.cast(lltype.Signed, self.cpu.realloc_frame)
mc.load_imm(mc.RAW_CALL_REG, adr)
mc.raw_call()
# The result is stored back into SPP (= r31)
mc.mr(r.SPP.value, r.r3.value)
self._restore_exception(mc, r.RCS2, r.RCS3)
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
if gcrootmap and gcrootmap.is_shadow_stack:
diff = mc.load_imm_plus(r.r5, gcrootmap.get_root_stack_top_addr())
mc.load(r.r5.value, r.r5.value, diff)
mc.store(r.r3.value, r.r5.value, -WORD)
mc.mtlr(r.RCS1.value) # restore LR
self._pop_core_regs_from_jitframe(mc)
self._pop_fp_regs_from_jitframe(mc)
mc.blr()
self._frame_realloc_slowpath = mc.materialize(self.cpu, [])
self.mc = None
def _store_and_reset_exception(self, mc, excvalloc, exctploc=None):
"""Reset the exception, after fetching it inside the two regs.
"""
mc.load_imm(r.r2, self.cpu.pos_exc_value())
diff = self.cpu.pos_exception() - self.cpu.pos_exc_value()
assert _check_imm_arg(diff)
# Load the exception fields into the two registers
mc.load(excvalloc.value, r.r2.value, 0)
if exctploc is not None:
mc.load(exctploc.value, r.r2.value, diff)
# Zero out the exception fields
mc.li(r.r0.value, 0)
mc.store(r.r0.value, r.r2.value, 0)
mc.store(r.r0.value, r.r2.value, diff)
def _restore_exception(self, mc, excvalloc, exctploc):
mc.load_imm(r.r2, self.cpu.pos_exc_value())
diff = self.cpu.pos_exception() - self.cpu.pos_exc_value()
assert _check_imm_arg(diff)
# Store the exception fields from the two registers
mc.store(excvalloc.value, r.r2.value, 0)
mc.store(exctploc.value, r.r2.value, diff)
def _reload_frame_if_necessary(self, mc, shadowstack_reg=None):
# might trash the VOLATILE registers different from r3 and f1
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
if gcrootmap:
if gcrootmap.is_shadow_stack:
if shadowstack_reg is None:
diff = mc.load_imm_plus(r.SPP,
gcrootmap.get_root_stack_top_addr())
mc.load(r.SPP.value, r.SPP.value, diff)
shadowstack_reg = r.SPP
mc.load(r.SPP.value, shadowstack_reg.value, -WORD)
wbdescr = self.cpu.gc_ll_descr.write_barrier_descr
if gcrootmap and wbdescr:
# frame never uses card marking, so we enforce this is not
# an array
self._write_barrier_fastpath(mc, wbdescr, [r.SPP], regalloc=None,
array=False, is_frame=True)
def _build_cond_call_slowpath(self, supports_floats, callee_only):
""" This builds a general call slowpath, for whatever call happens to
come.
"""
# signature of these cond_call_slowpath functions:
# * on entry, r12 contains the function to call
# * r3, r4, r5, r6 contain arguments for the call
# * r2 is the gcmap
# * the old value of these regs must already be stored in the jitframe
# * on exit, all registers are restored from the jitframe
mc = PPCBuilder()
self.mc = mc
ofs2 = self.cpu.get_ofs_of_frame_field('jf_gcmap')
mc.store(r.r2.value, r.SPP.value, ofs2)
# copy registers to the frame, with the exception of r3 to r6 and r12,
# because these have already been saved by the caller. Note that
# this is not symmetrical: these 5 registers are saved by the caller
# but restored here at the end of this function.
if callee_only:
saved_regs = PPCRegisterManager.save_around_call_regs
else:
saved_regs = PPCRegisterManager.all_regs
self._push_core_regs_to_jitframe(mc, [reg for reg in saved_regs
if reg is not r.r3 and
reg is not r.r4 and
reg is not r.r5 and
reg is not r.r6 and
reg is not r.r12])
if supports_floats:
self._push_fp_regs_to_jitframe(mc)
# Save away the LR inside r30
mc.mflr(r.RCS1.value)
# Do the call
mc.raw_call(r.r12)
# Finish
self._reload_frame_if_necessary(mc)
mc.mtlr(r.RCS1.value) # restore LR
self._pop_core_regs_from_jitframe(mc, saved_regs)
if supports_floats:
self._pop_fp_regs_from_jitframe(mc)
mc.blr()
self.mc = None
return mc.materialize(self.cpu, [])
def _build_malloc_slowpath(self, kind):
""" While arriving on slowpath, we have a gcmap in r2.
The arguments are passed in r.RES and r.RSZ, as follows:
kind == 'fixed': nursery_head in r.RES and the size in r.RSZ - r.RES.
kind == 'str/unicode': length of the string to allocate in r.RES.
kind == 'var': itemsize in r.RES, length to allocate in r.RSZ,
and tid in r.SCRATCH.
This function must preserve all registers apart from r.RES and r.RSZ.
On return, r2 must contain the address of nursery_free.
"""
assert kind in ['fixed', 'str', 'unicode', 'var']
mc = PPCBuilder()
self.mc = mc
ofs2 = self.cpu.get_ofs_of_frame_field('jf_gcmap')
mc.store(r.r2.value, r.SPP.value, ofs2)
saved_regs = [reg for reg in r.MANAGED_REGS
if reg is not r.RES and reg is not r.RSZ]
self._push_core_regs_to_jitframe(mc, saved_regs)
self._push_fp_regs_to_jitframe(mc)
#
if kind == 'fixed':
addr = self.cpu.gc_ll_descr.get_malloc_slowpath_addr()
elif kind == 'str':
addr = self.cpu.gc_ll_descr.get_malloc_fn_addr('malloc_str')
elif kind == 'unicode':
addr = self.cpu.gc_ll_descr.get_malloc_fn_addr('malloc_unicode')
else:
addr = self.cpu.gc_ll_descr.get_malloc_slowpath_array_addr()
# Save away the LR inside r30
mc.mflr(r.RCS1.value)
if kind == 'fixed':
# compute the size we want
mc.subf(r.r3.value, r.RES.value, r.RSZ.value)
if hasattr(self.cpu.gc_ll_descr, 'passes_frame'):
# for tests only
mc.mr(r.r4.value, r.SPP.value)
elif kind == 'str' or kind == 'unicode':
pass # length is already in r3
else:
# arguments to the called function are [itemsize, tid, length]
# itemsize is already in r3
mc.mr(r.r5.value, r.RSZ.value) # length
mc.mr(r.r4.value, r.SCRATCH.value) # tid
# Do the call
addr = rffi.cast(lltype.Signed, addr)
mc.load_imm(mc.RAW_CALL_REG, addr)
mc.raw_call()
self._reload_frame_if_necessary(mc)
# Check that we don't get NULL; if we do, we always interrupt the
# current loop, as a "good enough" approximation (same as
# emit_call_malloc_gc()).
self.propagate_memoryerror_if_reg_is_null(r.r3)
mc.mtlr(r.RCS1.value) # restore LR
self._pop_core_regs_from_jitframe(mc, saved_regs)
self._pop_fp_regs_from_jitframe(mc)
nursery_free_adr = self.cpu.gc_ll_descr.get_nursery_free_addr()
self.mc.load_imm(r.r2, nursery_free_adr)
# r2 is now the address of nursery_free
# r.RES is still the result of the call done above
# r.RSZ is loaded from [r2], to make the caller's store a no-op here
mc.load(r.RSZ.value, r.r2.value, 0)
#
mc.blr()
self.mc = None
return mc.materialize(self.cpu, [])
def _build_stack_check_slowpath(self):
_, _, slowpathaddr = self.cpu.insert_stack_check()
if slowpathaddr == 0 or not self.cpu.propagate_exception_descr:
return # no stack check (for tests, or non-translated)
#
# make a regular function that is called from a point near the start
# of an assembler function (after it adjusts the stack and saves
# registers).
mc = PPCBuilder()
#
# Save away the LR inside r30
mc.mflr(r.RCS1.value)
#
# Do the call
# use SP as single parameter for the call
mc.mr(r.r3.value, r.SP.value)
mc.load_imm(mc.RAW_CALL_REG, slowpathaddr)
mc.raw_call()
#
# Restore LR
mc.mtlr(r.RCS1.value)
#
# Check if it raised StackOverflow
mc.load_imm(r.SCRATCH, self.cpu.pos_exception())
mc.loadx(r.SCRATCH.value, 0, r.SCRATCH.value)
# if this comparison is true, then everything is ok,
# else we have an exception
mc.cmp_op(0, r.SCRATCH.value, 0, imm=True)
#
# So we return to LR back to our caller, conditionally if "EQ"
mc.beqlr()
#
# Else, jump to propagate_exception_path
assert self.propagate_exception_path
mc.b_abs(self.propagate_exception_path)
#
rawstart = mc.materialize(self.cpu, [])
self.stack_check_slowpath = rawstart
def _build_wb_slowpath(self, withcards, withfloats=False, for_frame=False):
descr = self.cpu.gc_ll_descr.write_barrier_descr
if descr is None:
return
if not withcards:
func = descr.get_write_barrier_fn(self.cpu)
else:
if descr.jit_wb_cards_set == 0:
return
func = descr.get_write_barrier_from_array_fn(self.cpu)
if func == 0:
return
#
# This builds a helper function called from the slow path of
# write barriers. It must save all registers, and optionally
# all fp registers. It takes its single argument in r0
# (or in SPP if 'for_frame').
if for_frame:
argument_loc = r.SPP
else:
argument_loc = r.r0
mc = PPCBuilder()
old_mc = self.mc
self.mc = mc
extra_stack_size = LOCAL_VARS_OFFSET + 4 * WORD + 8
extra_stack_size = (extra_stack_size + 15) & ~15
if for_frame:
# NOTE: don't save registers on the jitframe here! It might
# override already-saved values that will be restored
# later...
#
# This 'for_frame' version is called after a CALL. It does not
# need to save many registers: the registers that are anyway
# destroyed by the call can be ignored (VOLATILES), and the
# non-volatile registers won't be changed here. It only needs
# to save r.RCS1 (used below), r3 and f1 (possible results of
# the call), and two more non-volatile registers (used to store
# the RPython exception that occurred in the CALL, if any).
#
# We need to increase our stack frame size a bit to store them.
#
self.mc.load(r.SCRATCH.value, r.SP.value, 0) # SP back chain
self.mc.store_update(r.SCRATCH.value, r.SP.value, -extra_stack_size)
self.mc.std(r.RCS1.value, r.SP.value, LOCAL_VARS_OFFSET + 0 * WORD)
self.mc.std(r.RCS2.value, r.SP.value, LOCAL_VARS_OFFSET + 1 * WORD)
self.mc.std(r.RCS3.value, r.SP.value, LOCAL_VARS_OFFSET + 2 * WORD)
self.mc.std(r.r3.value, r.SP.value, LOCAL_VARS_OFFSET + 3 * WORD)
self.mc.stfd(r.f1.value, r.SP.value, LOCAL_VARS_OFFSET + 4 * WORD)
saved_regs = None
saved_fp_regs = None
else:
# push all volatile registers, push RCS1, and sometimes push RCS2
if withcards:
saved_regs = r.VOLATILES + [r.RCS1, r.RCS2]
else:
saved_regs = r.VOLATILES + [r.RCS1]
if withfloats:
saved_fp_regs = r.MANAGED_FP_REGS
else:
saved_fp_regs = []
self._push_core_regs_to_jitframe(mc, saved_regs)
self._push_fp_regs_to_jitframe(mc, saved_fp_regs)
if for_frame:
# note that it's safe to store the exception in register,
# since the call to write barrier can't collect
# (and this is assumed a bit left and right here, like lack
# of _reload_frame_if_necessary)
# This trashes r0 and r2, which is fine in this case
assert argument_loc is not r.r0
self._store_and_reset_exception(mc, r.RCS2, r.RCS3)
if withcards:
mc.mr(r.RCS2.value, argument_loc.value)
#
# Save the lr into r.RCS1
mc.mflr(r.RCS1.value)
#
func = rffi.cast(lltype.Signed, func)
# Note: if not 'for_frame', argument_loc is r0, which must carefully
# not be overwritten above
mc.mr(r.r3.value, argument_loc.value)
mc.load_imm(mc.RAW_CALL_REG, func)
mc.raw_call()
#
# Restore lr
mc.mtlr(r.RCS1.value)
if for_frame:
self._restore_exception(mc, r.RCS2, r.RCS3)
if withcards:
# A final andix before the blr, for the caller. Careful to
# not follow this instruction with another one that changes
# the status of cr0!
card_marking_mask = descr.jit_wb_cards_set_singlebyte
mc.lbz(r.RCS2.value, r.RCS2.value, descr.jit_wb_if_flag_byteofs)
mc.andix(r.RCS2.value, r.RCS2.value, card_marking_mask & 0xFF)
if for_frame:
self.mc.ld(r.RCS1.value, r.SP.value, LOCAL_VARS_OFFSET + 0 * WORD)
self.mc.ld(r.RCS2.value, r.SP.value, LOCAL_VARS_OFFSET + 1 * WORD)
self.mc.ld(r.RCS3.value, r.SP.value, LOCAL_VARS_OFFSET + 2 * WORD)
self.mc.ld(r.r3.value, r.SP.value, LOCAL_VARS_OFFSET + 3 * WORD)
self.mc.lfd(r.f1.value, r.SP.value, LOCAL_VARS_OFFSET + 4 * WORD)
self.mc.addi(r.SP.value, r.SP.value, extra_stack_size)
else:
self._pop_core_regs_from_jitframe(mc, saved_regs)
self._pop_fp_regs_from_jitframe(mc, saved_fp_regs)
mc.blr()
self.mc = old_mc
rawstart = mc.materialize(self.cpu, [])
if for_frame:
self.wb_slowpath[4] = rawstart
else:
self.wb_slowpath[withcards + 2 * withfloats] = rawstart
def _build_propagate_exception_path(self):
self.mc = PPCBuilder()
#
# read and reset the current exception
propagate_exception_descr = rffi.cast(lltype.Signed,
cast_instance_to_gcref(self.cpu.propagate_exception_descr))
ofs3 = self.cpu.get_ofs_of_frame_field('jf_guard_exc')
ofs4 = self.cpu.get_ofs_of_frame_field('jf_descr')
self._store_and_reset_exception(self.mc, r.r3)
self.mc.load_imm(r.r4, propagate_exception_descr)
self.mc.std(r.r3.value, r.SPP.value, ofs3)
self.mc.std(r.r4.value, r.SPP.value, ofs4)
#
self._call_footer()
rawstart = self.mc.materialize(self.cpu, [])
self.propagate_exception_path = rawstart
self.mc = None
def _call_header(self):
if IS_PPC_64 and IS_BIG_ENDIAN:
# Reserve space for a function descriptor, 3 words
self.mc.write64(0)
self.mc.write64(0)
self.mc.write64(0)
# Build a new stackframe of size STD_FRAME_SIZE_IN_BYTES
self.mc.store_update(r.SP.value, r.SP.value, -STD_FRAME_SIZE_IN_BYTES)
self.mc.mflr(r.SCRATCH.value)
self.mc.store(r.SCRATCH.value, r.SP.value,
STD_FRAME_SIZE_IN_BYTES + LR_BC_OFFSET)
# save registers r25 to r31
for i, reg in enumerate(REGISTERS_SAVED):
self.mc.store(reg.value, r.SP.value,
GPR_SAVE_AREA_OFFSET + i * WORD)
# save r4, the second argument, to THREADLOCAL_ADDR_OFFSET
self.mc.store(r.r4.value, r.SP.value, THREADLOCAL_ADDR_OFFSET)
# move r3, the first argument, to r31 (SPP): the jitframe object
self.mc.mr(r.SPP.value, r.r3.value)
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
if gcrootmap and gcrootmap.is_shadow_stack:
self._call_header_shadowstack(gcrootmap)
def _call_header_with_stack_check(self):
self._call_header()
if self.stack_check_slowpath == 0:
pass # not translated
else:
endaddr, lengthaddr, _ = self.cpu.insert_stack_check()
diff = lengthaddr - endaddr
assert _check_imm_arg(diff)
mc = self.mc
mc.load_imm(r.SCRATCH, self.stack_check_slowpath)
mc.load_imm(r.SCRATCH2, endaddr) # li r2, endaddr
mc.mtctr(r.SCRATCH.value)
mc.load(r.SCRATCH.value, r.SCRATCH2.value, 0) # ld r0, [end]
mc.load(r.SCRATCH2.value, r.SCRATCH2.value, diff)# ld r2, [length]
mc.subf(r.SCRATCH.value, r.SP.value, r.SCRATCH.value) # sub r0, SP
mc.cmp_op(0, r.SCRATCH.value, r.SCRATCH2.value, signed=False)
mc.bgtctrl()
def _call_footer(self):
# the return value is the jitframe
self.mc.mr(r.r3.value, r.SPP.value)
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
if gcrootmap and gcrootmap.is_shadow_stack:
self._call_footer_shadowstack(gcrootmap)
# restore registers r25 to r31
for i, reg in enumerate(REGISTERS_SAVED):
self.mc.load(reg.value, r.SP.value,
GPR_SAVE_AREA_OFFSET + i * WORD)
# load the return address into r4
self.mc.load(r.r4.value, r.SP.value,
STD_FRAME_SIZE_IN_BYTES + LR_BC_OFFSET)
# throw away the stack frame and return to r4
self.mc.addi(r.SP.value, r.SP.value, STD_FRAME_SIZE_IN_BYTES)
self.mc.mtlr(r.r4.value) # restore LR
self.mc.blr()
def setup(self, looptoken):
BaseAssembler.setup(self, looptoken)
assert self.memcpy_addr != 0, "setup_once() not called?"
self.current_clt = looptoken.compiled_loop_token
self.pending_guard_tokens = []
self.pending_guard_tokens_recovered = 0
#if WORD == 8:
# self.pending_memoryerror_trampoline_from = []
# self.error_trampoline_64 = 0
self.mc = PPCBuilder()
#assert self.datablockwrapper is None --- but obscure case
# possible, e.g. getting MemoryError and continuing
allblocks = self.get_asmmemmgr_blocks(looptoken)
self.datablockwrapper = MachineDataBlockWrapper(self.cpu.asmmemmgr,
allblocks)
self.target_tokens_currently_compiling = {}
self.frame_depth_to_patch = []
def update_frame_depth(self, frame_depth):
if frame_depth > 0x7fff:
raise JitFrameTooDeep # XXX
baseofs = self.cpu.get_baseofs_of_frame_field()
self.current_clt.frame_info.update_frame_depth(baseofs, frame_depth)
def patch_stack_checks(self, frame_depth):
if frame_depth > 0x7fff:
raise JitFrameTooDeep # XXX
for traps_pos, jmp_target in self.frame_depth_to_patch:
pmc = OverwritingBuilder(self.mc, traps_pos, 3)
# three traps, so exactly three instructions to patch here
pmc.cmpdi(0, r.r2.value, frame_depth) # 1
pmc.bc(7, 0, jmp_target - (traps_pos + 4)) # 2 "bge+"
pmc.li(r.r0.value, frame_depth) # 3
pmc.overwrite()
def _check_frame_depth(self, mc, gcmap):
""" check if the frame is of enough depth to follow this bridge.
Otherwise reallocate the frame in a helper.
"""
descrs = self.cpu.gc_ll_descr.getframedescrs(self.cpu)
ofs = self.cpu.unpack_fielddescr(descrs.arraydescr.lendescr)
mc.ld(r.r2.value, r.SPP.value, ofs)
patch_pos = mc.currpos()
mc.trap() # placeholder for cmpdi(0, r2, ...)
mc.trap() # placeholder for bge
mc.trap() # placeholder for li(r0, ...)
mc.load_imm(r.SCRATCH2, self._frame_realloc_slowpath)
mc.mtctr(r.SCRATCH2.value)
self.load_gcmap(mc, r.r2, gcmap)
mc.bctrl()
self.frame_depth_to_patch.append((patch_pos, mc.currpos()))
@rgc.no_release_gil
def assemble_loop(self, jd_id, unique_id, logger, loopname, inputargs,
operations, looptoken, log):
clt = CompiledLoopToken(self.cpu, looptoken.number)
looptoken.compiled_loop_token = clt
clt._debug_nbargs = len(inputargs)
if not we_are_translated():
# Arguments should be unique
assert len(set(inputargs)) == len(inputargs)
self.setup(looptoken)
frame_info = self.datablockwrapper.malloc_aligned(
jitframe.JITFRAMEINFO_SIZE, alignment=WORD)
clt.frame_info = rffi.cast(jitframe.JITFRAMEINFOPTR, frame_info)
clt.frame_info.clear() # for now
if log:
operations = self._inject_debugging_code(looptoken, operations,
'e', looptoken.number)
regalloc = Regalloc(assembler=self)
#
self._call_header_with_stack_check()
allgcrefs = []
operations = regalloc.prepare_loop(inputargs, operations,
looptoken, allgcrefs)
self.reserve_gcref_table(allgcrefs)
looppos = self.mc.get_relative_pos()
frame_depth_no_fixed_size = self._assemble(regalloc, inputargs,
operations)
self.update_frame_depth(frame_depth_no_fixed_size + JITFRAME_FIXED_SIZE)
#
size_excluding_failure_stuff = self.mc.get_relative_pos()
self.write_pending_failure_recoveries(regalloc)
full_size = self.mc.get_relative_pos()
#
self.patch_stack_checks(frame_depth_no_fixed_size + JITFRAME_FIXED_SIZE)
rawstart = self.materialize_loop(looptoken)
if IS_PPC_64 and IS_BIG_ENDIAN: # fix the function descriptor (3 words)
rffi.cast(rffi.LONGP, rawstart)[0] = rawstart + 3 * WORD
#
looptoken._ll_loop_code = looppos + rawstart
debug_start("jit-backend-addr")
debug_print("Loop %d (%s) has address 0x%x to 0x%x (bootstrap 0x%x)" % (
looptoken.number, loopname,
r_uint(rawstart + looppos),
r_uint(rawstart + size_excluding_failure_stuff),
r_uint(rawstart)))
debug_stop("jit-backend-addr")
self.patch_gcref_table(looptoken, rawstart)
self.patch_pending_failure_recoveries(rawstart)
#
ops_offset = self.mc.ops_offset
if not we_are_translated():
# used only by looptoken.dump() -- useful in tests
looptoken._ppc_rawstart = rawstart
looptoken._ppc_fullsize = full_size
looptoken._ppc_ops_offset = ops_offset
looptoken._ll_function_addr = rawstart
if logger:
log = logger.log_trace(jl.MARK_TRACE_ASM, None, self.mc)
log.write(inputargs, operations, ops_offset=ops_offset)
# legacy
if logger.logger_ops:
logger.logger_ops.log_loop(inputargs, operations, 0,
"rewritten", name=loopname,
ops_offset=ops_offset)
self.fixup_target_tokens(rawstart)
self.teardown()
# oprofile support
#if self.cpu.profile_agent is not None:
# name = "Loop # %s: %s" % (looptoken.number, loopname)
# self.cpu.profile_agent.native_code_written(name,
# rawstart, full_size)
#print(hex(rawstart))
#import pdb; pdb.set_trace()
return AsmInfo(ops_offset, rawstart + looppos,
size_excluding_failure_stuff - looppos, rawstart + looppos)
def _assemble(self, regalloc, inputargs, operations):
self._regalloc = regalloc
self.guard_success_cc = c.cond_none
regalloc.compute_hint_frame_locations(operations)
regalloc.walk_operations(inputargs, operations)
assert self.guard_success_cc == c.cond_none
if 1: # we_are_translated() or self.cpu.dont_keepalive_stuff:
self._regalloc = None # else keep it around for debugging
frame_depth = regalloc.get_final_frame_depth()
jump_target_descr = regalloc.jump_target_descr
if jump_target_descr is not None:
tgt_depth = jump_target_descr._ppc_clt.frame_info.jfi_frame_depth
target_frame_depth = tgt_depth - JITFRAME_FIXED_SIZE
frame_depth = max(frame_depth, target_frame_depth)
return frame_depth
@rgc.no_release_gil
def assemble_bridge(self, faildescr, inputargs, operations,
original_loop_token, log, logger):
if not we_are_translated():
# Arguments should be unique
assert len(set(inputargs)) == len(inputargs)
self.setup(original_loop_token)
descr_number = compute_unique_id(faildescr)
if log:
operations = self._inject_debugging_code(faildescr, operations,
'b', descr_number)
arglocs = self.rebuild_faillocs_from_descr(faildescr, inputargs)
regalloc = Regalloc(assembler=self)
allgcrefs = []
operations = regalloc.prepare_bridge(inputargs, arglocs,
operations,
allgcrefs,
self.current_clt.frame_info)
self.reserve_gcref_table(allgcrefs)
startpos = self.mc.get_relative_pos()
self._update_at_exit(arglocs, inputargs, faildescr, regalloc)
self._check_frame_depth(self.mc, regalloc.get_gcmap())
frame_depth_no_fixed_size = self._assemble(regalloc, inputargs, operations)
codeendpos = self.mc.get_relative_pos()
self.write_pending_failure_recoveries(regalloc)
fullsize = self.mc.get_relative_pos()
#
self.patch_stack_checks(frame_depth_no_fixed_size + JITFRAME_FIXED_SIZE)
rawstart = self.materialize_loop(original_loop_token)
debug_bridge(descr_number, rawstart, codeendpos)
self.patch_gcref_table(original_loop_token, rawstart)
self.patch_pending_failure_recoveries(rawstart)
# patch the jump from original guard
self.patch_jump_for_descr(faildescr, rawstart)
ops_offset = self.mc.ops_offset
frame_depth = max(self.current_clt.frame_info.jfi_frame_depth,
frame_depth_no_fixed_size + JITFRAME_FIXED_SIZE)
if logger:
log = logger.log_trace(jl.MARK_TRACE_ASM, None, self.mc)
log.write(inputargs, operations, ops_offset)
# log that the already written bridge is stitched to a descr!
logger.log_patch_guard(descr_number, rawstart)
# legacy
if logger.logger_ops:
logger.logger_ops.log_bridge(inputargs, operations, "rewritten",
faildescr, ops_offset=ops_offset)
self.fixup_target_tokens(rawstart)
self.update_frame_depth(frame_depth)
self.teardown()
return AsmInfo(ops_offset, startpos + rawstart, codeendpos - startpos,
startpos + rawstart)
def reserve_gcref_table(self, allgcrefs):
# allocate the gc table right now. We write absolute loads in
# each load_from_gc_table instruction for now. XXX improve,
# but it's messy.
self.gc_table_addr = self.datablockwrapper.malloc_aligned(
len(allgcrefs) * WORD, alignment=WORD)
self.setup_gcrefs_list(allgcrefs)
def patch_gcref_table(self, looptoken, rawstart):
rawstart = self.gc_table_addr
tracer = self.cpu.gc_ll_descr.make_gcref_tracer(rawstart,
self._allgcrefs)
gcreftracers = self.get_asmmemmgr_gcreftracers(looptoken)
gcreftracers.append(tracer) # keepalive
self.teardown_gcrefs_list()
def teardown(self):
self.pending_guard_tokens = None
self.mc = None
self.current_clt = None
def _find_failure_recovery_bytecode(self, faildescr):
return faildescr._failure_recovery_code_adr
def fixup_target_tokens(self, rawstart):
for targettoken in self.target_tokens_currently_compiling:
targettoken._ll_loop_code += rawstart
self.target_tokens_currently_compiling = None
def target_arglocs(self, looptoken):
return looptoken._ppc_arglocs
def materialize_loop(self, looptoken):
self.datablockwrapper.done()
self.datablockwrapper = None
allblocks = self.get_asmmemmgr_blocks(looptoken)
start = self.mc.materialize(self.cpu, allblocks,
self.cpu.gc_ll_descr.gcrootmap)
return start
def load_gcmap(self, mc, reg, gcmap):
# load the current gcmap into register 'reg'
ptr = rffi.cast(lltype.Signed, gcmap)
mc.load_imm(reg, ptr)
def push_gcmap(self, mc, gcmap, store=True):
# (called from callbuilder.py and ../llsupport/callbuilder.py)
assert store is True
self.load_gcmap(mc, r.SCRATCH, gcmap)
ofs = self.cpu.get_ofs_of_frame_field('jf_gcmap')
mc.store(r.SCRATCH.value, r.SPP.value, ofs)
def break_long_loop(self, regalloc):
# If the loop is too long, the guards in it will jump forward
# more than 32 KB. We use an approximate hack to know if we
# should break the loop here with an unconditional "b" that
# jumps over the target code.
jmp_pos = self.mc.currpos()
self.mc.trap()
self.write_pending_failure_recoveries(regalloc)
currpos = self.mc.currpos()
pmc = OverwritingBuilder(self.mc, jmp_pos, 1)
pmc.b(currpos - jmp_pos)
pmc.overwrite()
def generate_quick_failure(self, guardtok, regalloc):
startpos = self.mc.currpos()
# accum vecopt
self._update_at_exit(guardtok.fail_locs, guardtok.failargs,
guardtok.faildescr, regalloc)
pos = self.mc.currpos()
guardtok.rel_recovery_prefix = pos - startpos
faildescrindex, target = self.store_info_on_descr(startpos, guardtok)
assert target != 0
self.mc.load_imm(r.r2, target)
self.mc.mtctr(r.r2.value)
self._load_from_gc_table(r.r0, r.r2, faildescrindex)
self.load_gcmap(self.mc, r.r2, gcmap=guardtok.gcmap) # preserves r0
self.mc.bctr()
# we need to write at least 6 insns here, for patch_jump_for_descr()
while self.mc.currpos() < startpos + 6 * 4:
self.mc.trap()
return startpos
def write_pending_failure_recoveries(self, regalloc):
# for each pending guard, generate the code of the recovery stub
# at the end of self.mc.
for i in range(self.pending_guard_tokens_recovered,
len(self.pending_guard_tokens)):
tok = self.pending_guard_tokens[i]
tok.pos_recovery_stub = self.generate_quick_failure(tok, regalloc)
self.pending_guard_tokens_recovered = len(self.pending_guard_tokens)
def patch_pending_failure_recoveries(self, rawstart):
assert (self.pending_guard_tokens_recovered ==
len(self.pending_guard_tokens))
clt = self.current_clt
for tok in self.pending_guard_tokens:
addr = rawstart + tok.pos_jump_offset
#
# XXX see patch_jump_for_descr()
tok.faildescr.adr_jump_offset = rawstart + tok.pos_recovery_stub + tok.rel_recovery_prefix
#
relative_target = tok.pos_recovery_stub - tok.pos_jump_offset
#
if not tok.guard_not_invalidated():
mc = PPCBuilder()
mc.b_cond_offset(relative_target, tok.fcond)
mc.copy_to_raw_memory(addr)
else:
# GUARD_NOT_INVALIDATED, record an entry in
# clt.invalidate_positions of the form:
# (addr-in-the-code-of-the-not-yet-written-jump-target,
# relative-target-to-use)
relpos = tok.pos_jump_offset
clt.invalidate_positions.append((rawstart + relpos,
relative_target))
def patch_jump_for_descr(self, faildescr, adr_new_target):
# 'faildescr.adr_jump_offset' is the address of an instruction that is a
# conditional jump. We must patch this conditional jump to go
# to 'adr_new_target'. If the target is too far away, we can't
# patch it inplace, and instead we patch the quick failure code
# (which should be at least 6 instructions, so enough).
# --- XXX for now we always use the second solution ---
mc = PPCBuilder()
mc.b_abs(adr_new_target)
mc.copy_to_raw_memory(faildescr.adr_jump_offset)
assert faildescr.adr_jump_offset != 0
faildescr.adr_jump_offset = 0 # means "patched"
def get_asmmemmgr_blocks(self, looptoken):
clt = looptoken.compiled_loop_token
if clt.asmmemmgr_blocks is None:
clt.asmmemmgr_blocks = []
return clt.asmmemmgr_blocks
def regalloc_mov(self, prev_loc, loc):
if prev_loc.is_imm():
value = prev_loc.getint()
# move immediate value to register
if loc.is_reg():
self.mc.load_imm(loc, value)
return
# move immediate value to memory
elif loc.is_stack():
with scratch_reg(self.mc):
offset = loc.value
self.mc.load_imm(r.SCRATCH, value)
self.mc.store(r.SCRATCH.value, r.SPP.value, offset)
return
assert 0, "not supported location"
elif prev_loc.is_stack():
offset = prev_loc.value
# move from memory to register
if loc.is_reg():
reg = loc.value
self.mc.load(reg, r.SPP.value, offset)
return
# move in memory
elif loc.is_stack():
target_offset = loc.value
with scratch_reg(self.mc):
self.mc.load(r.SCRATCH.value, r.SPP.value, offset)
self.mc.store(r.SCRATCH.value, r.SPP.value, target_offset)
return
# move from memory to fp register
elif loc.is_fp_reg():
assert prev_loc.type == FLOAT, 'source not float location'
reg = loc.value
self.mc.lfd(reg, r.SPP.value, offset)
return
assert 0, "not supported location"
elif prev_loc.is_vector_reg():
assert loc.is_vector_reg()
self.mc.vmr(loc.value, prev_loc.value, prev_loc.value)
return
elif prev_loc.is_reg():
reg = prev_loc.value
# move to another register
if loc.is_reg():
other_reg = loc.value
self.mc.mr(other_reg, reg)
return
# move to memory
elif loc.is_stack():
offset = loc.value
self.mc.store(reg, r.SPP.value, offset)
return
assert 0, "not supported location"
elif prev_loc.is_imm_float():
value = prev_loc.getint()
# move immediate value to fp register
if loc.is_fp_reg():
with scratch_reg(self.mc):
self.mc.load_imm(r.SCRATCH, value)
self.mc.lfdx(loc.value, 0, r.SCRATCH.value)
return
# move immediate value to memory
elif loc.is_stack():
with scratch_reg(self.mc):
offset = loc.value
self.mc.load_imm(r.SCRATCH, value)
self.mc.lfdx(r.FP_SCRATCH.value, 0, r.SCRATCH.value)
self.mc.stfd(r.FP_SCRATCH.value, r.SPP.value, offset)
return
assert 0, "not supported location"
elif prev_loc.is_fp_reg():
reg = prev_loc.value
# move to another fp register
if loc.is_fp_reg():
other_reg = loc.value
self.mc.fmr(other_reg, reg)
return
# move from fp register to memory
elif loc.is_stack():
assert loc.type == FLOAT, "target not float location"
offset = loc.value
self.mc.stfd(reg, r.SPP.value, offset)
return
assert 0, "not supported location"
assert 0, "not supported location"
mov_loc_loc = regalloc_mov
def regalloc_push(self, loc, already_pushed):
"""Pushes the value stored in loc to the stack
Can trash the current value of SCRATCH when pushing a stack
loc"""
assert IS_PPC_64, 'needs to updated for ppc 32'
index = WORD * (~already_pushed)
if loc.type == FLOAT:
if not loc.is_fp_reg():
self.regalloc_mov(loc, r.FP_SCRATCH)
loc = r.FP_SCRATCH
self.mc.stfd(loc.value, r.SP.value, index)
else:
if not loc.is_core_reg():
self.regalloc_mov(loc, r.SCRATCH)
loc = r.SCRATCH
self.mc.std(loc.value, r.SP.value, index)
def regalloc_pop(self, loc, already_pushed):
"""Pops the value on top of the stack to loc. Can trash the current
value of SCRATCH when popping to a stack loc"""
assert IS_PPC_64, 'needs to updated for ppc 32'
index = WORD * (~already_pushed)
if loc.type == FLOAT:
if loc.is_fp_reg():
self.mc.lfd(loc.value, r.SP.value, index)
else:
self.mc.lfd(r.FP_SCRATCH.value, r.SP.value, index)
self.regalloc_mov(r.FP_SCRATCH, loc)
else:
if loc.is_core_reg():
self.mc.ld(loc.value, r.SP.value, index)
else:
self.mc.ld(r.SCRATCH.value, r.SP.value, index)
self.regalloc_mov(r.SCRATCH, loc)
def malloc_cond(self, nursery_free_adr, nursery_top_adr, size, gcmap):
assert size & (WORD-1) == 0 # must be correctly aligned
# We load into RES the address stored at nursery_free_adr. We
# calculate the new value for nursery_free_adr and store it in
# RSZ. Then we load the address stored in nursery_top_adr
# into SCRATCH. In the rare case where the value in RSZ is
# (unsigned) bigger than the one in SCRATCH we call
# malloc_slowpath. In the common case where malloc_slowpath
# is not called, we must still write RSZ back into
# nursery_free_adr (r2); so we do it always, even if we called
# malloc_slowpath.
diff = nursery_top_adr - nursery_free_adr
assert _check_imm_arg(diff)
mc = self.mc
mc.load_imm(r.r2, nursery_free_adr)
mc.load(r.RES.value, r.r2.value, 0) # load nursery_free
mc.load(r.SCRATCH.value, r.r2.value, diff) # load nursery_top
if _check_imm_arg(size):
mc.addi(r.RSZ.value, r.RES.value, size)
else:
mc.load_imm(r.RSZ, size)
mc.add(r.RSZ.value, r.RES.value, r.RSZ.value)
mc.cmp_op(0, r.RSZ.value, r.SCRATCH.value, signed=False)
fast_jmp_pos = mc.currpos()
mc.trap() # conditional jump, patched later
# new value of nursery_free_adr in RSZ and the adr of the new object
# in RES.
self.load_gcmap(mc, r.r2, gcmap)
# We are jumping to malloc_slowpath without a call through a function
# descriptor, because it is an internal call and "call" would trash
# r2 and r11
mc.bl_abs(self.malloc_slowpath)
offset = mc.currpos() - fast_jmp_pos
pmc = OverwritingBuilder(mc, fast_jmp_pos, 1)
pmc.bc(7, 1, offset) # jump if LE (not GT), predicted to be true
pmc.overwrite()
mc.store(r.RSZ.value, r.r2.value, 0) # store into nursery_free
def malloc_cond_varsize_frame(self, nursery_free_adr, nursery_top_adr,
sizeloc, gcmap):
diff = nursery_top_adr - nursery_free_adr
assert _check_imm_arg(diff)
mc = self.mc
mc.load_imm(r.r2, nursery_free_adr)
if sizeloc is r.RES:
mc.mr(r.RSZ.value, r.RES.value)
sizeloc = r.RSZ
mc.load(r.RES.value, r.r2.value, 0) # load nursery_free
mc.load(r.SCRATCH.value, r.r2.value, diff) # load nursery_top
mc.add(r.RSZ.value, r.RES.value, sizeloc.value)
mc.cmp_op(0, r.RSZ.value, r.SCRATCH.value, signed=False)
fast_jmp_pos = mc.currpos()
mc.trap() # conditional jump, patched later
# new value of nursery_free_adr in RSZ and the adr of the new object
# in RES.
self.load_gcmap(mc, r.r2, gcmap)
mc.bl_abs(self.malloc_slowpath)
offset = mc.currpos() - fast_jmp_pos
pmc = OverwritingBuilder(mc, fast_jmp_pos, 1)
pmc.bc(7, 1, offset) # jump if LE (not GT), predicted to be true
pmc.overwrite()
mc.store(r.RSZ.value, r.r2.value, 0) # store into nursery_free
def malloc_cond_varsize(self, kind, nursery_free_adr, nursery_top_adr,
lengthloc, itemsize, maxlength, gcmap,
arraydescr):
from rpython.jit.backend.llsupport.descr import ArrayDescr
assert isinstance(arraydescr, ArrayDescr)
# lengthloc is the length of the array, which we must not modify!
assert lengthloc is not r.RES and lengthloc is not r.RSZ
assert lengthloc.is_reg()
if maxlength > 2**16-1:
maxlength = 2**16-1 # makes things easier
mc = self.mc
mc.cmp_op(0, lengthloc.value, maxlength, imm=True, signed=False)
jmp_adr0 = mc.currpos()
mc.trap() # conditional jump, patched later
# ------------------------------------------------------------
# block of code for the case: the length is <= maxlength
diff = nursery_top_adr - nursery_free_adr
assert _check_imm_arg(diff)
mc.load_imm(r.r2, nursery_free_adr)
varsizeloc = self._multiply_by_constant(lengthloc, itemsize,
r.RSZ)
# varsizeloc is either RSZ here, or equal to lengthloc if
# itemsize == 1. It is the size of the variable part of the
# array, in bytes.
mc.load(r.RES.value, r.r2.value, 0) # load nursery_free
mc.load(r.SCRATCH.value, r.r2.value, diff) # load nursery_top
assert arraydescr.basesize >= self.gc_minimal_size_in_nursery
constsize = arraydescr.basesize + self.gc_size_of_header
force_realignment = (itemsize % WORD) != 0
if force_realignment:
constsize += WORD - 1
mc.addi(r.RSZ.value, varsizeloc.value, constsize)
if force_realignment:
# "& ~(WORD-1)"
bit_limit = 60 if WORD == 8 else 61
mc.rldicr(r.RSZ.value, r.RSZ.value, 0, bit_limit)
mc.add(r.RSZ.value, r.RES.value, r.RSZ.value)
# now RSZ contains the total size in bytes, rounded up to a multiple
# of WORD, plus nursery_free_adr
mc.cmp_op(0, r.RSZ.value, r.SCRATCH.value, signed=False)
jmp_adr1 = mc.currpos()
mc.trap() # conditional jump, patched later
# ------------------------------------------------------------
# block of code for two cases: either the length is > maxlength
# (jump from jmp_adr0), or the length is small enough but there
# is not enough space in the nursery (fall-through)
#
offset = mc.currpos() - jmp_adr0
pmc = OverwritingBuilder(mc, jmp_adr0, 1)
pmc.bgt(offset) # jump if GT
pmc.overwrite()
#
# save the gcmap
self.load_gcmap(mc, r.r2, gcmap)
#
# load the function to call into CTR
if kind == rewrite.FLAG_ARRAY:
addr = self.malloc_slowpath_varsize
elif kind == rewrite.FLAG_STR:
addr = self.malloc_slowpath_str
elif kind == rewrite.FLAG_UNICODE:
addr = self.malloc_slowpath_unicode
else:
raise AssertionError(kind)
mc.load_imm(r.SCRATCH, addr)
mc.mtctr(r.SCRATCH.value)
#
# load the argument(s)
if kind == rewrite.FLAG_ARRAY:
mc.mr(r.RSZ.value, lengthloc.value)
mc.load_imm(r.RES, itemsize)
mc.load_imm(r.SCRATCH, arraydescr.tid)
else:
mc.mr(r.RES.value, lengthloc.value)
#
# call!
mc.bctrl()
jmp_location = mc.currpos()
mc.trap() # jump forward, patched later
# ------------------------------------------------------------
# block of code for the common case: the length is <= maxlength
# and there is enough space in the nursery
offset = mc.currpos() - jmp_adr1
pmc = OverwritingBuilder(mc, jmp_adr1, 1)
pmc.ble(offset) # jump if LE
pmc.overwrite()
#
# write down the tid, but only in this case (not in other cases
# where r.RES is the result of the CALL)
mc.load_imm(r.SCRATCH, arraydescr.tid)
mc.store(r.SCRATCH.value, r.RES.value, 0)
# while we're at it, this line is not needed if we've done the CALL
mc.store(r.RSZ.value, r.r2.value, 0) # store into nursery_free
# ------------------------------------------------------------
offset = mc.currpos() - jmp_location
pmc = OverwritingBuilder(mc, jmp_location, 1)
pmc.b(offset) # jump always
pmc.overwrite()
def propagate_memoryerror_if_reg_is_null(self, reg_loc):
self.mc.cmp_op(0, reg_loc.value, 0, imm=True)
self.mc.b_cond_abs(self.propagate_exception_path, c.EQ)
def write_new_force_index(self):
# for shadowstack only: get a new, unused force_index number and
# write it to FORCE_INDEX_OFS. Used to record the call shape
# (i.e. where the GC pointers are in the stack) around a CALL
# instruction that doesn't already have a force_index.
gcrootmap = self.cpu.gc_ll_descr.gcrootmap
if gcrootmap and gcrootmap.is_shadow_stack:
clt = self.current_clt
force_index = clt.reserve_and_record_some_faildescr_index()
self._write_fail_index(force_index)
return force_index
else:
return 0
def _write_fail_index(self, fail_index):
with scratch_reg(self.mc):
self.mc.load_imm(r.SCRATCH, fail_index)
self.mc.store(r.SCRATCH.value, r.SPP.value, FORCE_INDEX_OFS)
def stitch_bridge(self, faildescr, target):
""" Stitching means that one can enter a bridge with a complete different register
allocation. This needs remapping which is done here for both normal registers
and accumulation registers.
"""
asminfo, bridge_faildescr, version, looptoken = target
assert isinstance(bridge_faildescr, ResumeGuardDescr)
assert isinstance(faildescr, ResumeGuardDescr)
assert asminfo.rawstart != 0
self.mc = PPCBuilder()
allblocks = self.get_asmmemmgr_blocks(looptoken)
self.datablockwrapper = MachineDataBlockWrapper(self.cpu.asmmemmgr,
allblocks)
frame_info = self.datablockwrapper.malloc_aligned(
jitframe.JITFRAMEINFO_SIZE, alignment=WORD)
# if accumulation is saved at the guard, we need to update it here!
guard_locs = self.rebuild_faillocs_from_descr(faildescr, version.inputargs)
bridge_locs = self.rebuild_faillocs_from_descr(bridge_faildescr, version.inputargs)
guard_accum_info = faildescr.rd_vector_info
# O(n**2), but usually you only have at most 1 fail argument
while guard_accum_info:
bridge_accum_info = bridge_faildescr.rd_vector_info
while bridge_accum_info:
if bridge_accum_info.failargs_pos == guard_accum_info.failargs_pos:
# the mapping might be wrong!
if bridge_accum_info.location is not guard_accum_info.location:
self.regalloc_mov(guard_accum_info.location, bridge_accum_info.location)
bridge_accum_info = bridge_accum_info.next()
guard_accum_info = guard_accum_info.next()
# register mapping is most likely NOT valid, thus remap it
src_locations1 = []
dst_locations1 = []
src_locations2 = []
dst_locations2 = []
# Build the four lists
assert len(guard_locs) == len(bridge_locs)
for i,src_loc in enumerate(guard_locs):
dst_loc = bridge_locs[i]
if not src_loc.is_fp_reg():
src_locations1.append(src_loc)
dst_locations1.append(dst_loc)
else:
src_locations2.append(src_loc)
dst_locations2.append(dst_loc)
remap_frame_layout_mixed(self, src_locations1, dst_locations1, r.SCRATCH,
src_locations2, dst_locations2, r.FP_SCRATCH)
offset = self.mc.get_relative_pos()
self.mc.b_abs(asminfo.rawstart)
rawstart = self.materialize_loop(looptoken)
# update the guard to jump right to this custom piece of assembler
self.patch_jump_for_descr(faildescr, rawstart)
def notimplemented_op(self, op, arglocs, regalloc):
msg = '[PPC/asm] %s not implemented\n' % op.getopname()
if we_are_translated():
llop.debug_print(lltype.Void, msg)
raise NotImplementedError(msg)
operations = [notimplemented_op] * (rop._LAST + 1)
for key, value in rop.__dict__.items():
key = key.lower()
if key.startswith('_'):
continue
methname = 'emit_%s' % key
if hasattr(AssemblerPPC, methname):
func = getattr(AssemblerPPC, methname).im_func
operations[value] = func
class BridgeAlreadyCompiled(Exception):
pass
|