runtime/Messengers.subproj/objc-msg-arm.s

   1 /*
   2  * @APPLE_LICENSE_HEADER_START@
   3  *
   4  * Copyright (c) 1999-2007 Apple Computer, Inc.  All Rights Reserved.
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /********************************************************************
  24  *
  25  *  objc-msg-arm.s - ARM code to support objc messaging
  26  *
  27  ********************************************************************/
  28
  29 #ifdef __arm__
  30
  31 #include <arm/arch.h>
  32 #include "objc-config.h"
  33 #include "isa.h"
  34
  35 #ifndef _ARM_ARCH_7
  36 #   error requires armv7
  37 #endif
  38
  39 // Set FP=1 on architectures that pass parameters in floating-point registers
  40 #if __ARM_ARCH_7K__
  41 #   define FP 1
  42 #else
  43 #   define FP 0
  44 #endif
  45
  46 #if FP
  47
  48 #   if !__ARM_NEON__
  49 #       error sorry
  50 #   endif
  51
  52 #   define FP_RETURN_ZERO \
  53         vmov.i32  q0, #0  ; \
  54         vmov.i32  q1, #0  ; \
  55         vmov.i32  q2, #0  ; \
  56         vmov.i32  q3, #0
  57
  58 #   define FP_SAVE \
  59         vpush   {q0-q3}
  60
  61 #   define FP_RESTORE \
  62         vpop    {q0-q3}
  63
  64 #else
  65
  66 #   define FP_RETURN_ZERO
  67 #   define FP_SAVE
  68 #   define FP_RESTORE
  69
  70 #endif
  71
  72 .syntax unified
  73
  74 #define MI_EXTERN(var) \
  75         .non_lazy_symbol_pointer                        ;\
  76 L##var##$$non_lazy_ptr:                                 ;\
  77         .indirect_symbol var                            ;\
  78         .long 0
  79
  80 #define MI_GET_EXTERN(reg,var)  \
  81         movw    reg, :lower16:(L##var##$$non_lazy_ptr-7f-4)  ;\
  82         movt    reg, :upper16:(L##var##$$non_lazy_ptr-7f-4)  ;\
  83 7:      add     reg, pc                                      ;\
  84         ldr     reg, [reg]
  85
  86 #define MI_GET_ADDRESS(reg,var)  \
  87         movw    reg, :lower16:(var-7f-4)  ;\
  88         movt    reg, :upper16:(var-7f-4)  ;\
  89 7:      add     reg, pc                                     ;\
  90
  91
  92 .data
  93
  94 #if SUPPORT_INDEXED_ISA
  95
  96         .align 2
  97         .globl _objc_indexed_classes
  98 _objc_indexed_classes:
  99         .fill ISA_INDEX_COUNT, 4, 0
 100
 101 #endif
 102
 103
 104
 105 // _objc_restartableRanges is used by method dispatch
 106 // caching code to figure out whether any threads are actively
 107 // in the cache for dispatching.  The labels surround the asm code
 108 // that do cache lookups.  The tables are zero-terminated.
 109
 110 .macro RestartableEntry
 111         .long   LLookupStart$0
 112         .long   0
 113         .short  LLookupEnd$0 - LLookupStart$0
 114         .short  0xffff // poor ol' armv7 doesn't support kernel based recovery
 115         .long   0
 116 .endmacro
 117
 118         .align 4
 119         .private_extern _objc_restartableRanges
 120 _objc_restartableRanges:
 121         RestartableEntry _cache_getImp
 122         RestartableEntry _objc_msgSend
 123         RestartableEntry _objc_msgSend_stret
 124         RestartableEntry _objc_msgSendSuper
 125         RestartableEntry _objc_msgSendSuper_stret
 126         RestartableEntry _objc_msgSendSuper2
 127         RestartableEntry _objc_msgSendSuper2_stret
 128         RestartableEntry _objc_msgLookup
 129         RestartableEntry _objc_msgLookup_stret
 130         RestartableEntry _objc_msgLookupSuper2
 131         RestartableEntry _objc_msgLookupSuper2_stret
 132         .fill   16, 1, 0
 133
 134
 135 /********************************************************************
 136  * Names for relative labels
 137  * DO NOT USE THESE LABELS ELSEWHERE
 138  * Reserved labels: 6: 7: 8: 9:
 139  ********************************************************************/
 140 // 6: used by CacheLookup
 141 // 7: used by MI_GET_ADDRESS etc
 142 // 8: used by CacheLookup
 143 #define LNilReceiver    9
 144 #define LNilReceiver_f  9f
 145 #define LNilReceiver_b  9b
 146
 147
 148 /********************************************************************
 149  * Macro parameters
 150  ********************************************************************/
 151
 152 #define NORMAL 0
 153 #define STRET 1
 154
 155
 156 /********************************************************************
 157  *
 158  * Structure definitions.
 159  *
 160  ********************************************************************/
 161
 162 /* objc_super parameter to sendSuper */
 163 #define RECEIVER         0
 164 #define CLASS            4
 165
 166 /* Selected field offsets in class structure */
 167 #define ISA              0
 168 #define SUPERCLASS       4
 169 #define CACHE            8
 170 #define CACHE_MASK      12
 171
 172 /* Field offsets in method cache bucket */
 173 #define CACHED_SEL       0
 174 #define CACHED_IMP       4
 175
 176 /* Selected field offsets in method structure */
 177 #define METHOD_NAME      0
 178 #define METHOD_TYPES     4
 179 #define METHOD_IMP       8
 180
 181
 182 //////////////////////////////////////////////////////////////////////
 183 //
 184 // ENTRY                functionName
 185 //
 186 // Assembly directives to begin an exported function.
 187 //
 188 // Takes: functionName - name of the exported function
 189 //////////////////////////////////////////////////////////////////////
 190
 191 .macro ENTRY /* name */
 192         .text
 193         .thumb
 194         .align 5
 195         .globl $0
 196         .thumb_func
 197 $0:
 198 .endmacro
 199
 200 .macro STATIC_ENTRY /*name*/
 201         .text
 202         .thumb
 203         .align 5
 204         .private_extern $0
 205         .thumb_func
 206 $0:
 207 .endmacro
 208
 209
 210 //////////////////////////////////////////////////////////////////////
 211 //
 212 // END_ENTRY    functionName
 213 //
 214 // Assembly directives to end an exported function.  Just a placeholder,
 215 // a close-parenthesis for ENTRY, until it is needed for something.
 216 //
 217 // Takes: functionName - name of the exported function
 218 //////////////////////////////////////////////////////////////////////
 219
 220 .macro END_ENTRY /* name */
 221 LExit$0:
 222 .endmacro
 223
 224
 225 //////////////////////////////////////////////////////////////////////
 226 //
 227 // SAVE_REGS
 228 //
 229 // Create a stack frame and save all argument registers in preparation
 230 // for a function call.
 231 //////////////////////////////////////////////////////////////////////
 232
 233 .macro SAVE_REGS
 234
 235         stmfd   sp!, {r0-r3,r7,lr}
 236         add     r7, sp, #16
 237         sub     sp, #8                  // align stack
 238         FP_SAVE
 239
 240 .endmacro
 241
 242
 243 //////////////////////////////////////////////////////////////////////
 244 //
 245 // RESTORE_REGS
 246 //
 247 // Restore all argument registers and pop the stack frame created by
 248 // SAVE_REGS.
 249 //////////////////////////////////////////////////////////////////////
 250
 251 .macro RESTORE_REGS
 252
 253         FP_RESTORE
 254         add     sp, #8                  // align stack
 255         ldmfd   sp!, {r0-r3,r7,lr}
 256
 257 .endmacro
 258
 259 /////////////////////////////////////////////////////////////////////
 260 //
 261 // CacheLookup  NORMAL|STRET <function>
 262 // CacheLookup2 NORMAL|STRET <function>
 263 //
 264 // Locate the implementation for a selector in a class's method cache.
 265 //
 266 // Takes:
 267 //        $0 = NORMAL, STRET
 268 //        r0 or r1 (STRET) = receiver
 269 //        r1 or r2 (STRET) = selector
 270 //        r9 = class to search in
 271 //
 272 // On exit: r9 clobbered
 273 //          (found) continues after CacheLookup, IMP in r12, eq set
 274 //          (not found) continues after CacheLookup2
 275 //
 276 /////////////////////////////////////////////////////////////////////
 277
 278 .macro CacheLookup
 279         //
 280         // Restart protocol:
 281         //
 282         //   As soon as we're past the LLookupStart$1 label we may have loaded
 283         //   an invalid cache pointer or mask.
 284         //
 285         //   When task_restartable_ranges_synchronize() is called,
 286         //   (or when a signal hits us) before we're past LLookupEnd$1,
 287         //   then our PC will be reset to LCacheMiss$1 which forcefully
 288         //   jumps to the cache-miss codepath.
 289         //
 290         //   It is assumed that the CacheMiss codepath starts right at the end
 291         //   of CacheLookup2 and will re-setup the registers to meet the cache-miss
 292         //   requirements:
 293         //
 294         //   GETIMP:
 295         //     The cache-miss is just returning NULL (setting r9 to 0)
 296         //
 297         //   NORMAL and STRET:
 298         //   - r0 or r1 (STRET) contains the receiver
 299         //   - r1 or r2 (STRET) contains the selector
 300         //   - r9 contains the isa (reloaded from r0/r1)
 301         //   - other registers are set as per calling conventions
 302         //
 303 LLookupStart$1:
 304
 305         ldrh    r12, [r9, #CACHE_MASK]  // r12 = mask
 306         ldr     r9, [r9, #CACHE]        // r9 = buckets
 307 .if $0 == STRET
 308         and     r12, r12, r2            // r12 = index = SEL & mask
 309 .else
 310         and     r12, r12, r1            // r12 = index = SEL & mask
 311 .endif
 312         add     r9, r9, r12, LSL #3     // r9 = bucket = buckets+index*8
 313         ldr     r12, [r9, #CACHED_SEL]  // r12 = bucket->sel
 314 6:
 315 .if $0 == STRET
 316         teq     r12, r2
 317 .else
 318         teq     r12, r1
 319 .endif
 320         bne     8f
 321         ldr     r12, [r9, #CACHED_IMP]  // r12 = bucket->imp
 322
 323 .if $0 == STRET
 324         tst     r12, r12                // set ne for stret forwarding
 325 .else
 326         // eq already set for nonstret forwarding by `teq` above
 327 .endif
 328
 329 .endmacro
 330
 331 .macro CacheLookup2
 332 #if CACHED_SEL != 0
 333 #   error this code requires that SEL be at offset 0
 334 #endif
 335 8:
 336         cmp     r12, #1
 337         blo     LCacheMiss$1            // if (bucket->sel == 0) cache miss
 338         it      eq                      // if (bucket->sel == 1) cache wrap
 339         ldreq   r9, [r9, #CACHED_IMP]   // bucket->imp is before first bucket
 340         ldr     r12, [r9, #8]!          // r12 = (++bucket)->sel
 341         b       6b
 342
 343 LLookupEnd$1:
 344 LCacheMiss$1:
 345
 346 .endmacro
 347
 348 /////////////////////////////////////////////////////////////////////
 349 //
 350 // GetClassFromIsa      return-type
 351 //
 352 // Given an Isa, return the class for the Isa.
 353 //
 354 // Takes:
 355 //        r9 = class
 356 //
 357 // On exit: r12 clobbered
 358 //          r9 contains the class for this Isa.
 359 //
 360 /////////////////////////////////////////////////////////////////////
 361 .macro GetClassFromIsa
 362
 363 #if SUPPORT_INDEXED_ISA
 364         // Note: We are doing a little wasted work here to load values we might not
 365         // need.  Branching turns out to be even worse when performance was measured.
 366         MI_GET_ADDRESS(r12, _objc_indexed_classes)
 367         tst.w   r9, #ISA_INDEX_IS_NPI_MASK
 368         itt     ne
 369         ubfxne  r9, r9, #ISA_INDEX_SHIFT, #ISA_INDEX_BITS
 370         ldrne.w r9, [r12, r9, lsl #2]
 371 #endif
 372
 373 .endmacro
 374
 375
 376 /********************************************************************
 377  * IMP cache_getImp(Class cls, SEL sel)
 378  *
 379  * On entry:    r0 = class whose cache is to be searched
 380  *              r1 = selector to search for
 381  *
 382  * If found, returns method implementation.
 383  * If not found, returns NULL.
 384  ********************************************************************/
 385
 386         STATIC_ENTRY _cache_getImp
 387
 388         mov     r9, r0
 389         CacheLookup NORMAL, _cache_getImp
 390         // cache hit, IMP in r12
 391         mov     r0, r12
 392         bx      lr                      // return imp
 393
 394         CacheLookup2 GETIMP, _cache_getImp
 395         // cache miss, return nil
 396         mov     r0, #0
 397         bx      lr
 398
 399         END_ENTRY _cache_getImp
 400
 401
 402 /********************************************************************
 403  *
 404  * id objc_msgSend(id self, SEL _cmd, ...);
 405  * IMP objc_msgLookup(id self, SEL _cmd, ...);
 406  *
 407  * objc_msgLookup ABI:
 408  * IMP returned in r12
 409  * Forwarding returned in Z flag
 410  * r9 reserved for our use but not used
 411  *
 412  ********************************************************************/
 413
 414         ENTRY _objc_msgSend
 415
 416         cbz     r0, LNilReceiver_f
 417
 418         ldr     r9, [r0]                // r9 = self->isa
 419         GetClassFromIsa                 // r9 = class
 420         CacheLookup NORMAL, _objc_msgSend
 421         // cache hit, IMP in r12, eq already set for nonstret forwarding
 422         bx      r12                     // call imp
 423
 424         CacheLookup2 NORMAL, _objc_msgSend
 425         // cache miss
 426         ldr     r9, [r0]                // r9 = self->isa
 427         GetClassFromIsa                 // r9 = class
 428         b       __objc_msgSend_uncached
 429
 430 LNilReceiver:
 431         // r0 is already zero
 432         mov     r1, #0
 433         mov     r2, #0
 434         mov     r3, #0
 435         FP_RETURN_ZERO
 436         bx      lr
 437
 438         END_ENTRY _objc_msgSend
 439
 440
 441         ENTRY _objc_msgLookup
 442
 443         cbz     r0, LNilReceiver_f
 444
 445         ldr     r9, [r0]                // r9 = self->isa
 446         GetClassFromIsa                 // r9 = class
 447         CacheLookup NORMAL, _objc_msgLookup
 448         // cache hit, IMP in r12, eq already set for nonstret forwarding
 449         bx      lr
 450
 451         CacheLookup2 NORMAL, _objc_msgLookup
 452         // cache miss
 453         ldr     r9, [r0]                // r9 = self->isa
 454         GetClassFromIsa                 // r9 = class
 455         b       __objc_msgLookup_uncached
 456
 457 LNilReceiver:
 458         MI_GET_ADDRESS(r12, __objc_msgNil)
 459         bx      lr
 460
 461         END_ENTRY _objc_msgLookup
 462
 463
 464         STATIC_ENTRY __objc_msgNil
 465
 466         // r0 is already zero
 467         mov     r1, #0
 468         mov     r2, #0
 469         mov     r3, #0
 470         FP_RETURN_ZERO
 471         bx      lr
 472
 473         END_ENTRY __objc_msgNil
 474
 475
 476 /********************************************************************
 477  * void objc_msgSend_stret(void *st_addr, id self, SEL op, ...);
 478  * IMP objc_msgLookup_stret(void *st_addr, id self, SEL op, ...);
 479  *
 480  * objc_msgSend_stret is the struct-return form of msgSend.
 481  * The ABI calls for r0 to be used as the address of the structure
 482  * being returned, with the parameters in the succeeding registers.
 483  *
 484  * On entry: r0 is the address where the structure is returned,
 485  *           r1 is the message receiver,
 486  *           r2 is the selector
 487  ********************************************************************/
 488
 489         ENTRY _objc_msgSend_stret
 490
 491         cbz     r1, LNilReceiver_f
 492
 493         ldr     r9, [r1]                // r9 = self->isa
 494         GetClassFromIsa                 // r9 = class
 495         CacheLookup STRET, _objc_msgSend_stret
 496         // cache hit, IMP in r12, ne already set for stret forwarding
 497         bx      r12
 498
 499         CacheLookup2 STRET, _objc_msgSend_stret
 500         // cache miss
 501         ldr     r9, [r1]                // r9 = self->isa
 502         GetClassFromIsa                 // r9 = class
 503         b       __objc_msgSend_stret_uncached
 504
 505 LNilReceiver:
 506         bx      lr
 507
 508         END_ENTRY _objc_msgSend_stret
 509
 510
 511         ENTRY _objc_msgLookup_stret
 512
 513         cbz     r1, LNilReceiver_f
 514
 515         ldr     r9, [r1]                // r9 = self->isa
 516         GetClassFromIsa                 // r9 = class
 517         CacheLookup STRET, _objc_msgLookup_stret
 518         // cache hit, IMP in r12, ne already set for stret forwarding
 519         bx      lr
 520
 521         CacheLookup2 STRET, _objc_msgLookup_stret
 522         // cache miss
 523         ldr     r9, [r1]                // r9 = self->isa
 524         GetClassFromIsa                 // r9 = class
 525         b       __objc_msgLookup_stret_uncached
 526
 527 LNilReceiver:
 528         MI_GET_ADDRESS(r12, __objc_msgNil_stret)
 529         bx      lr
 530
 531         END_ENTRY _objc_msgLookup_stret
 532
 533
 534         STATIC_ENTRY __objc_msgNil_stret
 535
 536         bx      lr
 537
 538         END_ENTRY __objc_msgNil_stret
 539
 540
 541 /********************************************************************
 542  * id objc_msgSendSuper(struct objc_super *super, SEL op, ...)
 543  *
 544  * struct objc_super {
 545  *     id receiver;
 546  *     Class cls;       // the class to search
 547  * }
 548  ********************************************************************/
 549
 550         ENTRY _objc_msgSendSuper
 551
 552         ldr     r9, [r0, #CLASS]        // r9 = struct super->class
 553         CacheLookup NORMAL, _objc_msgSendSuper
 554         // cache hit, IMP in r12, eq already set for nonstret forwarding
 555         ldr     r0, [r0, #RECEIVER]     // load real receiver
 556         bx      r12                     // call imp
 557
 558         CacheLookup2 NORMAL, _objc_msgSendSuper
 559         // cache miss
 560         ldr     r9, [r0, #CLASS]        // r9 = struct super->class
 561         ldr     r0, [r0, #RECEIVER]     // load real receiver
 562         b       __objc_msgSend_uncached
 563
 564         END_ENTRY _objc_msgSendSuper
 565
 566
 567 /********************************************************************
 568  * id objc_msgSendSuper2(struct objc_super *super, SEL op, ...)
 569  *
 570  * struct objc_super {
 571  *     id receiver;
 572  *     Class cls;       // SUBCLASS of the class to search
 573  * }
 574  ********************************************************************/
 575
 576         ENTRY _objc_msgSendSuper2
 577
 578         ldr     r9, [r0, #CLASS]        // class = struct super->class
 579         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 580         CacheLookup NORMAL, _objc_msgSendSuper2
 581         // cache hit, IMP in r12, eq already set for nonstret forwarding
 582         ldr     r0, [r0, #RECEIVER]     // load real receiver
 583         bx      r12                     // call imp
 584
 585         CacheLookup2 NORMAL, _objc_msgSendSuper2
 586         // cache miss
 587         ldr     r9, [r0, #CLASS]        // class = struct super->class
 588         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 589         ldr     r0, [r0, #RECEIVER]     // load real receiver
 590         b       __objc_msgSend_uncached
 591
 592         END_ENTRY _objc_msgSendSuper2
 593
 594
 595         ENTRY _objc_msgLookupSuper2
 596
 597         ldr     r9, [r0, #CLASS]        // class = struct super->class
 598         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 599         CacheLookup NORMAL, _objc_msgLookupSuper2
 600         // cache hit, IMP in r12, eq already set for nonstret forwarding
 601         ldr     r0, [r0, #RECEIVER]     // load real receiver
 602         bx      lr
 603
 604         CacheLookup2 NORMAL, _objc_msgLookupSuper2
 605         // cache miss
 606         ldr     r9, [r0, #CLASS]
 607         ldr     r9, [r9, #SUPERCLASS]   // r9 = class to search
 608         ldr     r0, [r0, #RECEIVER]     // load real receiver
 609         b       __objc_msgLookup_uncached
 610
 611         END_ENTRY _objc_msgLookupSuper2
 612
 613
 614 /********************************************************************
 615  * void objc_msgSendSuper_stret(void *st_addr, objc_super *self, SEL op, ...);
 616  *
 617  * objc_msgSendSuper_stret is the struct-return form of msgSendSuper.
 618  * The ABI calls for r0 to be used as the address of the structure
 619  * being returned, with the parameters in the succeeding registers.
 620  *
 621  * On entry: r0 is the address where the structure is returned,
 622  *           r1 is the address of the objc_super structure,
 623  *           r2 is the selector
 624  ********************************************************************/
 625
 626         ENTRY _objc_msgSendSuper_stret
 627
 628         ldr     r9, [r1, #CLASS]        // r9 = struct super->class
 629         CacheLookup STRET, _objc_msgSendSuper_stret
 630         // cache hit, IMP in r12, ne already set for stret forwarding
 631         ldr     r1, [r1, #RECEIVER]     // load real receiver
 632         bx      r12                     // call imp
 633
 634         CacheLookup2 STRET, _objc_msgSendSuper_stret
 635         // cache miss
 636         ldr     r9, [r1, #CLASS]        // r9 = struct super->class
 637         ldr     r1, [r1, #RECEIVER]     // load real receiver
 638         b       __objc_msgSend_stret_uncached
 639
 640         END_ENTRY _objc_msgSendSuper_stret
 641
 642
 643 /********************************************************************
 644  * id objc_msgSendSuper2_stret
 645  ********************************************************************/
 646
 647         ENTRY _objc_msgSendSuper2_stret
 648
 649         ldr     r9, [r1, #CLASS]        // class = struct super->class
 650         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 651         CacheLookup STRET, _objc_msgSendSuper2_stret
 652         // cache hit, IMP in r12, ne already set for stret forwarding
 653         ldr     r1, [r1, #RECEIVER]     // load real receiver
 654         bx      r12                     // call imp
 655
 656         CacheLookup2 STRET, _objc_msgSendSuper2_stret
 657         // cache miss
 658         ldr     r9, [r1, #CLASS]        // class = struct super->class
 659         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 660         ldr     r1, [r1, #RECEIVER]     // load real receiver
 661         b       __objc_msgSend_stret_uncached
 662
 663         END_ENTRY _objc_msgSendSuper2_stret
 664
 665
 666         ENTRY _objc_msgLookupSuper2_stret
 667
 668         ldr     r9, [r1, #CLASS]        // class = struct super->class
 669         ldr     r9, [r9, #SUPERCLASS]   // class = class->superclass
 670         CacheLookup STRET, _objc_msgLookupSuper2_stret
 671         // cache hit, IMP in r12, ne already set for stret forwarding
 672         ldr     r1, [r1, #RECEIVER]     // load real receiver
 673         bx      lr
 674
 675         CacheLookup2 STRET, _objc_msgLookupSuper2_stret
 676         // cache miss
 677         ldr     r9, [r1, #CLASS]
 678         ldr     r9, [r9, #SUPERCLASS]   // r9 = class to search
 679         ldr     r1, [r1, #RECEIVER]     // load real receiver
 680         b       __objc_msgLookup_stret_uncached
 681
 682         END_ENTRY _objc_msgLookupSuper2_stret
 683
 684
 685 /////////////////////////////////////////////////////////////////////
 686 //
 687 // MethodTableLookup    NORMAL|STRET
 688 //
 689 // Locate the implementation for a selector in a class's method lists.
 690 //
 691 // Takes:
 692 //        $0 = NORMAL, STRET
 693 //        r0 or r1 (STRET) = receiver
 694 //        r1 or r2 (STRET) = selector
 695 //        r9 = class to search in
 696 //
 697 // On exit: IMP in r12, eq/ne set for forwarding
 698 //
 699 /////////////////////////////////////////////////////////////////////
 700
 701 .macro MethodTableLookup
 702
 703         SAVE_REGS
 704
 705         // lookUpImpOrForward(obj, sel, cls, LOOKUP_INITIALIZE | LOOKUP_RESOLVER)
 706 .if $0 == NORMAL
 707         // receiver already in r0
 708         // selector already in r1
 709 .else
 710         mov     r0, r1                  // receiver
 711         mov     r1, r2                  // selector
 712 .endif
 713         mov     r2, r9                  // class to search
 714         mov     r3, #3                  // LOOKUP_INITIALIZE | LOOKUP_INITIALIZE
 715         blx     _lookUpImpOrForward
 716         mov     r12, r0                 // r12 = IMP
 717
 718 .if $0 == NORMAL
 719         cmp     r12, r12                // set eq for nonstret forwarding
 720 .else
 721         tst     r12, r12                // set ne for stret forwarding
 722 .endif
 723
 724         RESTORE_REGS
 725
 726 .endmacro
 727
 728
 729 /********************************************************************
 730  *
 731  * _objc_msgSend_uncached
 732  * _objc_msgSend_stret_uncached
 733  * _objc_msgLookup_uncached
 734  * _objc_msgLookup_stret_uncached
 735  * The uncached method lookup.
 736  *
 737  ********************************************************************/
 738
 739         STATIC_ENTRY __objc_msgSend_uncached
 740
 741         // THIS IS NOT A CALLABLE C FUNCTION
 742         // Out-of-band r9 is the class to search
 743
 744         MethodTableLookup NORMAL        // returns IMP in r12
 745         bx      r12
 746
 747         END_ENTRY __objc_msgSend_uncached
 748
 749
 750         STATIC_ENTRY __objc_msgSend_stret_uncached
 751
 752         // THIS IS NOT A CALLABLE C FUNCTION
 753         // Out-of-band r9 is the class to search
 754
 755         MethodTableLookup STRET         // returns IMP in r12
 756         bx      r12
 757
 758         END_ENTRY __objc_msgSend_stret_uncached
 759
 760
 761         STATIC_ENTRY __objc_msgLookup_uncached
 762
 763         // THIS IS NOT A CALLABLE C FUNCTION
 764         // Out-of-band r9 is the class to search
 765
 766         MethodTableLookup NORMAL        // returns IMP in r12
 767         bx      lr
 768
 769         END_ENTRY __objc_msgLookup_uncached
 770
 771
 772         STATIC_ENTRY __objc_msgLookup_stret_uncached
 773
 774         // THIS IS NOT A CALLABLE C FUNCTION
 775         // Out-of-band r9 is the class to search
 776
 777         MethodTableLookup STRET         // returns IMP in r12
 778         bx      lr
 779
 780         END_ENTRY __objc_msgLookup_stret_uncached
 781
 782
 783 /********************************************************************
 784 *
 785 * id _objc_msgForward(id self, SEL _cmd,...);
 786 *
 787 * _objc_msgForward and _objc_msgForward_stret are the externally-callable
 788 *   functions returned by things like method_getImplementation().
 789 * _objc_msgForward_impcache is the function pointer actually stored in
 790 *   method caches.
 791 *
 792 ********************************************************************/
 793
 794         MI_EXTERN(__objc_forward_handler)
 795         MI_EXTERN(__objc_forward_stret_handler)
 796
 797         STATIC_ENTRY __objc_msgForward_impcache
 798         // Method cache version
 799
 800         // THIS IS NOT A CALLABLE C FUNCTION
 801         // Out-of-band Z is 0 (EQ) for normal, 1 (NE) for stret
 802
 803         beq     __objc_msgForward
 804         b       __objc_msgForward_stret
 805
 806         END_ENTRY __objc_msgForward_impcache
 807
 808
 809         ENTRY __objc_msgForward
 810         // Non-stret version
 811
 812         MI_GET_EXTERN(r12, __objc_forward_handler)
 813         ldr     r12, [r12]
 814         bx      r12
 815
 816         END_ENTRY __objc_msgForward
 817
 818
 819         ENTRY __objc_msgForward_stret
 820         // Struct-return version
 821
 822         MI_GET_EXTERN(r12, __objc_forward_stret_handler)
 823         ldr     r12, [r12]
 824         bx      r12
 825
 826         END_ENTRY __objc_msgForward_stret
 827
 828
 829         ENTRY _objc_msgSend_noarg
 830         b       _objc_msgSend
 831         END_ENTRY _objc_msgSend_noarg
 832
 833         ENTRY _objc_msgSend_debug
 834         b       _objc_msgSend
 835         END_ENTRY _objc_msgSend_debug
 836
 837         ENTRY _objc_msgSendSuper2_debug
 838         b       _objc_msgSendSuper2
 839         END_ENTRY _objc_msgSendSuper2_debug
 840
 841         ENTRY _objc_msgSend_stret_debug
 842         b       _objc_msgSend_stret
 843         END_ENTRY _objc_msgSend_stret_debug
 844
 845         ENTRY _objc_msgSendSuper2_stret_debug
 846         b       _objc_msgSendSuper2_stret
 847         END_ENTRY _objc_msgSendSuper2_stret_debug
 848
 849
 850         ENTRY _method_invoke
 851
 852         // See if this is a small method.
 853         lsls    r12, r1, #31
 854         bne.w   L_method_invoke_small
 855
 856         // We can directly load the IMP from big methods.
 857         // r1 is method triplet instead of SEL
 858         ldr     r12, [r1, #METHOD_IMP]
 859         ldr     r1, [r1, #METHOD_NAME]
 860         bx      r12
 861
 862 L_method_invoke_small:
 863         // Small methods require a call to handle swizzling.
 864         SAVE_REGS
 865         mov     r0, r1
 866         bl      __method_getImplementationAndName
 867         mov     r12, r0
 868         mov     r9, r1
 869         RESTORE_REGS
 870         mov     r1, r9
 871         bx      r12
 872
 873
 874         END_ENTRY _method_invoke
 875
 876
 877         ENTRY _method_invoke_stret
 878
 879         // See if this is a small method.
 880         lsls    r12, r2, #31
 881         bne.w   L_method_invoke_stret_small
 882
 883         // We can directly load the IMP from big methods.
 884         // r2 is method triplet instead of SEL
 885         ldr     r12, [r2, #METHOD_IMP]
 886         ldr     r2, [r2, #METHOD_NAME]
 887         bx      r12
 888
 889 L_method_invoke_stret_small:
 890         // Small methods require a call to handle swizzling.
 891         SAVE_REGS
 892         mov     r0, r2
 893         bl      __method_getImplementationAndName
 894         mov     r12, r0
 895         mov     r9, r1
 896         RESTORE_REGS
 897         mov     r2, r9
 898         bx      r12
 899
 900         END_ENTRY _method_invoke_stret
 901
 902
 903 .section __DATA,__objc_msg_break
 904 .long 0
 905 .long 0
 906
 907 #endif