1 |// Low-level VM code for ARM CPUs.
2 |// Bytecode interpreter, fast functions and helper functions.
3 |// Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
6 |.section code_op, code_sub
8 |.actionlist build_actionlist
10 |.globalnames globnames
11 |.externnames extnames
13 |// Note: The ragged indentation of the instructions is intentional.
14 |// The starting columns indicate data dependencies.
16 |//-----------------------------------------------------------------------
18 |// Fixed register assignments for the interpreter.
20 |// The following must be C callee-save.
21 |.define MASKR8, r4 // 255*8 constant for fast bytecode decoding.
22 |.define KBASE, r5 // Constants of current Lua function.
23 |.define PC, r6 // Next PC.
24 |.define DISPATCH, r7 // Opcode dispatch table.
25 |.define LREG, r8 // Register holding lua_State (also in SAVE_L).
27 |// C callee-save in EABI, but often refetched. Temporary in iOS 3.0+.
28 |.define BASE, r9 // Base of current Lua stack frame.
30 |// The following temporaries are not saved across C calls, except for RA/RC.
31 |.define RA, r10 // Callee-save.
32 |.define RC, r11 // Callee-save.
34 |.define OP, r12 // Overlaps RB, must not be lr.
37 |// Calling conventions. Also used as temporaries.
42 |.define CARG12, r0 // For 1st soft-fp double.
43 |.define CARG34, r2 // For 2nd soft-fp double.
48 |// Stack layout while in interpreter. Must match with lj_frame.h.
49 |.define CFRAME_SPACE, #28
50 |.define SAVE_ERRF, [sp, #24]
51 |.define SAVE_NRES, [sp, #20]
52 |.define SAVE_CFRAME, [sp, #16]
53 |.define SAVE_L, [sp, #12]
54 |.define SAVE_PC, [sp, #8]
55 |.define SAVE_MULTRES, [sp, #4]
58 |.define TMPDhi, [sp, #4]
64 | push {r4, r5, r6, r7, r8, r9, r10, r11, lr}
65 | sub sp, sp, CFRAME_SPACE
67 |.macro restoreregs_ret
68 | add sp, sp, CFRAME_SPACE
69 | pop {r4, r5, r6, r7, r8, r9, r10, r11, pc}
72 |// Type definitions. Some of these are only used for documentation.
73 |.type L, lua_State, LREG
74 |.type GL, global_State
87 |//-----------------------------------------------------------------------
89 |// Trap for not-yet-implemented parts.
90 |.macro NYI; ud; .endmacro
92 |//-----------------------------------------------------------------------
94 |// Access to frame relative to BASE.
95 |.define FRAME_FUNC, #-8
96 |.define FRAME_PC, #-4
98 |.macro decode_RA8, dst, ins; and dst, MASKR8, ins, lsr #5; .endmacro
99 |.macro decode_RB8, dst, ins; and dst, MASKR8, ins, lsr #21; .endmacro
100 |.macro decode_RC8, dst, ins; and dst, MASKR8, ins, lsr #13; .endmacro
101 |.macro decode_RD, dst, ins; lsr dst, ins, #16; .endmacro
102 |.macro decode_OP, dst, ins; and dst, ins, #255; .endmacro
104 |// Instruction fetch.
111 |// Instruction decode+dispatch.
113 | ldr OP, [DISPATCH, OP, lsl #2]
124 |// Instruction footer.
126 | // Replicated dispatch. Less unpredictable branches, but higher I-Cache use.
127 | .define ins_next, ins_NEXT
128 | .define ins_next_, ins_NEXT
129 | .define ins_next1, ins_NEXT1
130 | .define ins_next2, ins_NEXT2
131 | .define ins_next3, ins_NEXT3
133 | // Common dispatch. Lower I-Cache use, only one (very) unpredictable branch.
134 | // Affects only certain kinds of benchmarks (and only with -j off).
151 |// Avoid register name substitution for field name.
154 |// Call decode and dispatch.
156 | // BASE = new base, CARG3 = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
157 | ldr PC, LFUNC:CARG3->field_pc
158 | ldrb OP, [PC] // STALL: load PC. early PC.
160 | ldr OP, [DISPATCH, OP, lsl #2] // STALL: load OP. early OP.
167 | // BASE = new base, CARG3 = LFUNC/CFUNC, RC = nargs*8, PC = caller PC
168 | str PC, [BASE, FRAME_PC]
169 | ins_callt // STALL: locked PC.
172 |//-----------------------------------------------------------------------
174 |// Macros to test operand types.
175 |.macro checktp, reg, tp; cmn reg, #-tp; .endmacro
176 |.macro checktpeq, reg, tp; cmneq reg, #-tp; .endmacro
177 |.macro checktpne, reg, tp; cmnne reg, #-tp; .endmacro
178 |.macro checkstr, reg, target; checktp reg, LJ_TSTR; bne target; .endmacro
179 |.macro checktab, reg, target; checktp reg, LJ_TTAB; bne target; .endmacro
180 |.macro checkfunc, reg, target; checktp reg, LJ_TFUNC; bne target; .endmacro
182 |// Assumes DISPATCH is relative to GL.
183 #define DISPATCH_GL(field) (GG_DISP2G + (int)offsetof(global_State, field))
184 #define DISPATCH_J(field) (GG_DISP2J + (int)offsetof(jit_State, field))
186 #define PC2PROTO(field) ((int)offsetof(GCproto, field)-(int)sizeof(GCproto))
188 |.macro hotcheck, delta
190 | and CARG1, CARG1, #126
191 | sub CARG1, CARG1, #-GG_DISP2HOT
192 | ldrh CARG2, [DISPATCH, CARG1]
193 | subs CARG2, CARG2, #delta
194 | strh CARG2, [DISPATCH, CARG1]
198 | hotcheck HOTCOUNT_LOOP
203 | hotcheck HOTCOUNT_CALL
207 |// Set current VM state.
208 |.macro mv_vmstate, reg, st; mvn reg, #LJ_VMST_..st; .endmacro
209 |.macro st_vmstate, reg; str reg, [DISPATCH, #DISPATCH_GL(vmstate)]; .endmacro
211 |// Move table write barrier back. Overwrites mark and tmp.
212 |.macro barrierback, tab, mark, tmp
213 | ldr tmp, [DISPATCH, #DISPATCH_GL(gc.grayagain)]
214 | bic mark, mark, #LJ_GC_BLACK // black2gray(tab)
215 | str tab, [DISPATCH, #DISPATCH_GL(gc.grayagain)]
216 | strb mark, tab->marked
217 | str tmp, tab->gclist
221 ||if (LJ_TARGET_OSX) {
226 |//-----------------------------------------------------------------------
229 #error "Only dual-number mode supported for ARM target"
232 /* Generate subroutines used by opcodes and other parts of the VM. */
233 /* The .code_sub section should be last to help static branch prediction. */
234 static void build_subroutines(BuildCtx *ctx)
238 |//-----------------------------------------------------------------------
239 |//-- Return handling ----------------------------------------------------
240 |//-----------------------------------------------------------------------
243 | // See vm_return. Also: RB = previous base.
245 | beq ->cont_dispatch
247 | // Return from pcall or xpcall fast func.
248 | ldr PC, [RB, FRAME_PC] // Fetch PC of previous frame.
249 | mvn CARG2, #~LJ_TTRUE
251 | // Prepending may overwrite the pcall frame, so do it at the end.
252 | str CARG2, [RA, FRAME_PC] // Prepend true to results.
256 | add RC, RC, #8 // RC = (nresults+1)*8.
257 | ands CARG1, PC, #FRAME_TYPE
258 | str RC, SAVE_MULTRES
259 | beq ->BC_RET_Z // Handle regular return to Lua.
262 | // BASE = base, RA = resultptr, RC/MULTRES = (nresults+1)*8, PC = return
263 | // CARG1 = PC & FRAME_TYPE
264 | bic RB, PC, #FRAME_TYPEP
265 | cmp CARG1, #FRAME_C
266 | sub RB, BASE, RB // RB = previous base.
270 | ldr KBASE, SAVE_NRES
271 | mv_vmstate CARG4, C
274 | lsl KBASE, KBASE, #3 // KBASE = (nresults_wanted+1)*8
278 | subs CARG3, CARG3, #8
279 | ldrd CARG12, [RA], #8
280 | strd CARG12, [BASE], #8
283 | cmp KBASE, RC // More/less results wanted?
286 | str BASE, L->top // Store new top.
289 | ldr RC, SAVE_CFRAME // Restore previous C frame.
290 | mov CRET1, #0 // Ok return status for vm_pcall.
297 | blt >7 // Less results wanted?
298 | // More results wanted. Check stack size and fill up results with nil.
299 | ldr CARG3, L->maxstack
300 | mvn CARG2, #~LJ_TNIL
303 | str CARG2, [BASE, #4]
308 |7: // Less results wanted.
309 | sub CARG1, RC, KBASE
310 | cmp KBASE, #0 // LUA_MULTRET+1 case?
311 | subne BASE, BASE, CARG1 // Either keep top or shrink it.
314 |8: // Corner case: need to grow stack for filling up results.
315 | // This can happen if:
316 | // - A C function grows the stack (a lot).
317 | // - The GC shrinks the stack in between.
318 | // - A return back from a lua_call() with (high) nresults adjustment.
319 | str BASE, L->top // Save current top held in BASE (yes).
322 | bl extern lj_state_growstack // (lua_State *L, int n)
323 | ldr BASE, L->top // Need the (realloced) L->top in BASE.
326 |->vm_unwind_c: // Unwind C stack, return from vm_pcall.
327 | // (void *cframe, int errcode)
330 |->vm_unwind_c_eh: // Landing pad for external unwinder.
332 | mv_vmstate CARG4, C
333 | ldr GL:CARG3, L->glref
334 | str CARG4, GL:CARG3->vmstate
337 |->vm_unwind_ff: // Unwind C stack, return from ff pcall.
339 | bic CARG1, CARG1, #~CFRAME_RAWMASK // Use two steps: bic sp is deprecated.
341 |->vm_unwind_ff_eh: // Landing pad for external unwinder.
344 | mov RC, #16 // 2 results: false + error message.
345 | lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
347 | ldr DISPATCH, L->glref // Setup pointer to dispatch table.
348 | mvn CARG1, #~LJ_TFALSE
349 | sub RA, BASE, #8 // Results start at BASE-8.
350 | ldr PC, [BASE, FRAME_PC] // Fetch PC of previous frame.
351 | add DISPATCH, DISPATCH, #GG_G2DISP
352 | mv_vmstate CARG2, INTERP
353 | str CARG1, [BASE, #-4] // Prepend false to error message.
357 |//-----------------------------------------------------------------------
358 |//-- Grow stack for calls -----------------------------------------------
359 |//-----------------------------------------------------------------------
361 |->vm_growstack_c: // Grow stack for C function.
363 | mov CARG2, #LUA_MINSTACK
366 |->vm_growstack_l: // Grow stack for Lua function.
367 | // BASE = new base, RA = BASE+framesize*8, RC = nargs*8, PC = first PC
372 | add PC, PC, #4 // Must point after first instruction.
376 | // L->base = new base, L->top = top
378 | bl extern lj_state_growstack // (lua_State *L, int n)
381 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
382 | sub NARGS8:RC, RC, BASE
383 | // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
384 | ins_callt // Just retry the call.
386 |//-----------------------------------------------------------------------
387 |//-- Entry points into the assembler VM ---------------------------------
388 |//-----------------------------------------------------------------------
390 |->vm_resume: // Setup C frame and resume thread.
391 | // (lua_State *L, TValue *base, int nres1 = 0, ptrdiff_t ef = 0)
394 | ldr DISPATCH, L:CARG1->glref // Setup pointer to dispatch table.
396 | add DISPATCH, DISPATCH, #GG_G2DISP
399 | str CARG3, SAVE_NRES
400 | add CARG2, sp, #CFRAME_RESUME
401 | ldrb CARG1, L->status
402 | str CARG3, SAVE_ERRF
403 | str CARG2, L->cframe
404 | str CARG3, SAVE_CFRAME
406 | str L, SAVE_PC // Any value outside of bytecode is ok.
409 | // Resume after yield (like a return).
414 | strb CARG3, L->status
415 | sub RC, CARG1, BASE
416 | ldr PC, [BASE, FRAME_PC]
417 | lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
418 | mv_vmstate CARG2, INTERP
420 | ands CARG1, PC, #FRAME_TYPE
422 | str RC, SAVE_MULTRES
426 |->vm_pcall: // Setup protected C frame and enter VM.
427 | // (lua_State *L, TValue *base, int nres1, ptrdiff_t ef)
430 | str CARG4, SAVE_ERRF
433 |->vm_call: // Setup C frame and enter VM.
434 | // (lua_State *L, TValue *base, int nres1)
438 |1: // Entry point for vm_pcall above (PC = ftype).
439 | ldr RC, L:CARG1->cframe
440 | str CARG3, SAVE_NRES
444 | str sp, L->cframe // Add our C frame to cframe chain.
445 | ldr DISPATCH, L->glref // Setup pointer to dispatch table.
446 | str CARG1, SAVE_PC // Any value outside of bytecode is ok.
447 | str RC, SAVE_CFRAME
448 | add DISPATCH, DISPATCH, #GG_G2DISP
450 |3: // Entry point for vm_cpcall/vm_resume (BASE = base, PC = ftype).
451 | ldr RB, L->base // RB = old base (for vmeta_call).
455 | lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
456 | sub PC, PC, RB // PC = frame delta + frame type
457 | mv_vmstate CARG2, INTERP
458 | sub NARGS8:RC, CARG1, BASE
462 | // RB = old base, BASE = new base, RC = nargs*8, PC = caller PC
463 | ldrd CARG34, [BASE, FRAME_FUNC]
464 | checkfunc CARG4, ->vmeta_call
466 |->vm_call_dispatch_f:
468 | // BASE = new base, CARG3 = func, RC = nargs*8, PC = caller PC
470 |->vm_cpcall: // Setup protected C frame, call C.
471 | // (lua_State *L, lua_CFunction func, void *ud, lua_CPFunction cp)
474 | ldr RA, L:CARG1->stack
477 | str CARG1, SAVE_PC // Any value outside of bytecode is ok.
479 | sub RA, RA, RB // Compute -savestack(L, L->top).
480 | str sp, L->cframe // Add our C frame to cframe chain.
482 | str RA, SAVE_NRES // Neg. delta means cframe w/o frame.
483 | str RB, SAVE_ERRF // No error function.
484 | str RC, SAVE_CFRAME
485 | blx CARG4 // (lua_State *L, lua_CFunction func, void *ud)
486 | ldr DISPATCH, L->glref // Setup pointer to dispatch table.
489 | add DISPATCH, DISPATCH, #GG_G2DISP
490 | bne <3 // Else continue with the call.
491 | b ->vm_leave_cp // No base? Just remove C frame.
493 |//-----------------------------------------------------------------------
494 |//-- Metamethod handling ------------------------------------------------
495 |//-----------------------------------------------------------------------
497 |//-- Continuation dispatch ----------------------------------------------
500 | // BASE = meta base, RA = resultptr, RC = (nresults+1)*8
501 | ldr LFUNC:CARG3, [RB, FRAME_FUNC]
502 | ldr CARG1, [BASE, #-16] // Get continuation.
504 | mov BASE, RB // Restore caller BASE.
508 | ldr PC, [CARG4, #-12] // Restore PC from [cont|PC].
509 | ldr CARG3, LFUNC:CARG3->field_pc
512 | str INS, [CARG2, #-4] // Ensure one valid arg.
516 | ldr KBASE, [CARG3, #PC2PROTO(k)]
517 | // BASE = base, RA = resultptr, CARG4 = meta base
522 | beq ->cont_ffi_callback // cont = 1: return from FFI callback.
523 | // cont = 0: tailcall from C function.
524 | ldr CARG3, [BASE, FRAME_FUNC]
525 | sub CARG4, CARG4, #16
526 | sub RC, CARG4, BASE
530 |->cont_cat: // RA = resultptr, CARG4 = meta base
532 | sub CARG2, CARG4, #16
537 | add CARG1, BASE, RC
538 | subs CARG1, CARG2, CARG1
539 | strdne CARG34, [CARG2]
542 | strd CARG34, [BASE, RA]
545 |//-- Table indexing metamethods -----------------------------------------
548 | add CARG2, BASE, RB
552 | sub CARG2, DISPATCH, #-DISPATCH_GL(tmptv)
553 | mvn CARG4, #~LJ_TTAB
554 | str TAB:RB, [CARG2]
555 | str CARG4, [CARG2, #4]
557 | mvn CARG4, #~LJ_TSTR
563 |->vmeta_tgetb: // RC = index
566 | mvn CARG4, #~LJ_TISNUM
567 | add CARG2, BASE, RB
573 | add CARG2, BASE, RB
574 | add CARG3, BASE, RC
579 | bl extern lj_meta_tget // (lua_State *L, TValue *o, TValue *k)
580 | // Returns TValue * (finished) or NULL (metamethod).
581 | IOS ldr BASE, L->base
584 | ldrd CARG34, [CRET1]
587 | strd CARG34, [BASE, RA]
590 |3: // Call __index metamethod.
591 | // BASE = base, L->top = new base, stack = cont/func/t/k
592 | rsb CARG1, BASE, #FRAME_CONT
594 | mov NARGS8:RC, #16 // 2 args for func(t, k).
595 | str PC, [BASE, #-12] // [cont|PC]
596 | add PC, CARG1, BASE
597 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC] // Guaranteed to be a function here.
598 | b ->vm_call_dispatch_f
600 |//-----------------------------------------------------------------------
603 | add CARG2, BASE, RB
607 | sub CARG2, DISPATCH, #-DISPATCH_GL(tmptv)
608 | mvn CARG4, #~LJ_TTAB
609 | str TAB:RB, [CARG2]
610 | str CARG4, [CARG2, #4]
612 | mvn CARG4, #~LJ_TSTR
618 |->vmeta_tsetb: // RC = index
621 | mvn CARG4, #~LJ_TISNUM
622 | add CARG2, BASE, RB
628 | add CARG2, BASE, RB
629 | add CARG3, BASE, RC
634 | bl extern lj_meta_tset // (lua_State *L, TValue *o, TValue *k)
635 | // Returns TValue * (finished) or NULL (metamethod).
636 | IOS ldr BASE, L->base
638 | ldrd CARG34, [BASE, RA]
641 | // NOBARRIER: lj_meta_tset ensures the table is not black.
642 | strd CARG34, [CRET1]
646 |3: // Call __newindex metamethod.
647 | // BASE = base, L->top = new base, stack = cont/func/t/k/(v)
648 | rsb CARG1, BASE, #FRAME_CONT
650 | mov NARGS8:RC, #24 // 3 args for func(t, k, v).
651 | strd CARG34, [BASE, #16] // Copy value to third argument.
652 | str PC, [BASE, #-12] // [cont|PC]
653 | add PC, CARG1, BASE
654 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC] // Guaranteed to be a function here.
655 | b ->vm_call_dispatch_f
657 |//-- Comparison metamethods ---------------------------------------------
666 | decode_OP CARG4, INS
667 | bl extern lj_meta_comp // (lua_State *L, TValue *o1, *o2, int op)
668 | // Returns 0/1 or TValue * (metamethod).
670 | IOS ldr BASE, L->base
676 | add RB, PC, RB, lsl #2
677 | subhs PC, RB, #0x20000
681 |->cont_ra: // RA = resultptr
684 | decode_RA8 CARG3, INS
685 | strd CARG12, [BASE, CARG3]
688 |->cont_condt: // RA = resultptr
689 | ldr CARG2, [RA, #4]
690 | mvn CARG1, #~LJ_TTRUE
691 | cmp CARG1, CARG2 // Branch if result is true.
694 |->cont_condf: // RA = resultptr
695 | ldr CARG2, [RA, #4]
696 | checktp CARG2, LJ_TFALSE // Branch if result is false.
700 | // CARG2, CARG3, CARG4 are already set by BC_ISEQV/BC_ISNEV.
705 | bl extern lj_meta_equal // (lua_State *L, GCobj *o1, *o2, int ne)
706 | // Returns 0/1 or TValue * (metamethod).
716 | bl extern lj_meta_equal_cd // (lua_State *L, BCIns op)
717 | // Returns 0/1 or TValue * (metamethod).
721 |//-- Arithmetic metamethods ---------------------------------------------
726 | add CARG3, BASE, RB
727 | add CARG4, KBASE, RC
733 | add CARG4, BASE, RB
734 | add CARG3, KBASE, RC
740 | add CARG3, BASE, RC
741 | add CARG4, BASE, RC
747 | add CARG3, BASE, RB
748 | add CARG4, BASE, RC
751 | add CARG2, BASE, RA
756 | bl extern lj_meta_arith // (lua_State *L, TValue *ra,*rb,*rc, BCReg op)
757 | // Returns NULL (finished) or TValue * (metamethod).
758 | IOS ldr BASE, L->base
762 | // Call metamethod for binary op.
764 | // BASE = old base, CRET1 = new base, stack = cont/func/o1/o2
765 | sub CARG2, CRET1, BASE
766 | str PC, [CRET1, #-12] // [cont|PC]
767 | add PC, CARG2, #FRAME_CONT
769 | mov NARGS8:RC, #16 // 2 args for func(o1, o2).
770 | b ->vm_call_dispatch
773 | add CARG2, BASE, RC
777 | bl extern lj_meta_len // (lua_State *L, TValue *o)
778 | // Returns NULL (retry) or TValue * (metamethod base).
779 | IOS ldr BASE, L->base
780 #ifdef LUAJIT_ENABLE_LUA52COMPAT
782 | bne ->vmeta_binop // Binop call for compatibility.
783 | ldr TAB:CARG1, [BASE, RC]
786 | b ->vmeta_binop // Binop call for compatibility.
789 |//-- Call metamethod ----------------------------------------------------
791 |->vmeta_call: // Resolve and call __call metamethod.
792 | // RB = old base, BASE = new base, RC = nargs*8
794 | str RB, L->base // This is the callers base!
795 | sub CARG2, BASE, #8
797 | add CARG3, BASE, NARGS8:RC
799 | bl extern lj_meta_call // (lua_State *L, TValue *func, TValue *top)
801 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC] // Guaranteed to be a function here.
802 | add NARGS8:RC, NARGS8:RC, #8 // Got one more argument now.
805 |->vmeta_callt: // Resolve __call for BC_CALLT.
806 | // BASE = old base, RA = new base, RC = nargs*8
811 | add CARG3, RA, NARGS8:RC
812 | bl extern lj_meta_call // (lua_State *L, TValue *func, TValue *top)
813 | IOS ldr BASE, L->base
814 | ldr LFUNC:CARG3, [RA, FRAME_FUNC] // Guaranteed to be a function here.
815 | ldr PC, [BASE, FRAME_PC]
816 | add NARGS8:RC, NARGS8:RC, #8 // Got one more argument now.
819 |//-- Argument coercion for 'for' statement ------------------------------
826 | bl extern lj_meta_for // (lua_State *L, TValue *base)
827 | IOS ldr BASE, L->base
842 |//-----------------------------------------------------------------------
843 |//-- Fast functions -----------------------------------------------------
844 |//-----------------------------------------------------------------------
850 |.macro .ffunc_1, name
852 | ldrd CARG12, [BASE]
857 |.macro .ffunc_2, name
859 | ldrd CARG12, [BASE]
860 | ldrd CARG34, [BASE, #8]
865 |.macro .ffunc_n, name
867 | checktp CARG2, LJ_TISNUM
871 |.macro .ffunc_nn, name
873 | checktp CARG2, LJ_TISNUM
874 | cmnlo CARG4, #-LJ_TISNUM
878 |// Inlined GC threshold check. Caveat: uses CARG1 and CARG2.
880 | ldr CARG1, [DISPATCH, #DISPATCH_GL(gc.total)]
881 | ldr CARG2, [DISPATCH, #DISPATCH_GL(gc.threshold)]
886 |//-- Base library: checks -----------------------------------------------
889 | checktp CARG2, LJ_TTRUE
891 | ldr PC, [BASE, FRAME_PC]
892 | strd CARG12, [BASE, #-8]
894 | subs RA, NARGS8:RC, #8
895 | add RC, NARGS8:RC, #8 // Compute (nresults+1)*8.
896 | beq ->fff_res // Done if exactly 1 argument.
898 | ldrd CARG12, [RB, #8]
900 | strd CARG12, [RB], #8
905 | ldr CARG2, [BASE, #4]
908 | checktp CARG2, LJ_TISNUM
909 | mvnlo CARG2, #~LJ_TISNUM
910 | rsb CARG4, CARG2, #(int)(offsetof(GCfuncC, upvalue)>>3)-1
911 | lsl CARG4, CARG4, #3
912 | ldrd CARG12, [CFUNC:CARG3, CARG4]
915 |//-- Base library: getters and setters ---------------------------------
917 |.ffunc_1 getmetatable
918 | checktp CARG2, LJ_TTAB
919 | cmnne CARG2, #-LJ_TUDATA
921 |1: // Field metatable must be at same offset for GCtab and GCudata!
922 | ldr TAB:RB, TAB:CARG1->metatable
924 | mvn CARG2, #~LJ_TNIL
925 | ldr STR:RC, [DISPATCH, #DISPATCH_GL(gcroot[GCROOT_MMNAME+MM_metatable])]
928 | ldr CARG3, TAB:RB->hmask
929 | ldr CARG4, STR:RC->hash
930 | ldr NODE:INS, TAB:RB->node
931 | and CARG3, CARG3, CARG4 // idx = str->hash & tab->hmask
932 | add CARG3, CARG3, CARG3, lsl #1
933 | add NODE:INS, NODE:INS, CARG3, lsl #3 // node = tab->node + idx*3*8
934 |3: // Rearranged logic, because we expect _not_ to find the key.
935 | ldrd CARG34, NODE:INS->key // STALL: early NODE:INS.
936 | ldrd CARG12, NODE:INS->val
937 | ldr NODE:INS, NODE:INS->next
938 | checktp CARG4, LJ_TSTR
939 | cmpeq CARG3, STR:RC
944 | mov CARG1, RB // Use metatable as default result.
945 | mvn CARG2, #~LJ_TTAB
948 | checktp CARG2, LJ_TNIL
953 | checktp CARG2, LJ_TISNUM
955 | movlo CARG2, #~LJ_TISNUM
956 | add CARG4, DISPATCH, CARG2, lsl #2
957 | ldr TAB:RB, [CARG4, #DISPATCH_GL(gcroot[GCROOT_BASEMT])]
960 |.ffunc_2 setmetatable
961 | // Fast path: no mt for table yet and not clearing the mt.
962 | checktp CARG2, LJ_TTAB
963 | ldreq TAB:RB, TAB:CARG1->metatable
964 | checktpeq CARG4, LJ_TTAB
965 | ldrbeq CARG4, TAB:CARG1->marked
968 | tst CARG4, #LJ_GC_BLACK // isblack(table)
969 | str TAB:CARG3, TAB:CARG1->metatable
971 | barrierback TAB:CARG1, CARG4, CARG3
975 | ldrd CARG34, [BASE]
979 | checktab CARG4, ->fff_fallback
981 | add CARG3, BASE, #8
983 | bl extern lj_tab_get // (lua_State *L, GCtab *t, cTValue *key)
984 | // Returns cTValue *.
986 | ldrd CARG12, [CRET1]
989 |//-- Base library: conversions ------------------------------------------
992 | // Only handles the number case inline (without a base argument).
993 | checktp CARG2, LJ_TISNUM
998 | // Only handles the string or number case inline.
999 | checktp CARG2, LJ_TSTR
1000 | // A __tostring method in the string base metatable is ignored.
1002 | // Handle numbers inline, unless a number base metatable is present.
1003 | ldr CARG4, [DISPATCH, #DISPATCH_GL(gcroot[GCROOT_BASEMT_NUM])]
1005 | checktp CARG2, LJ_TISNUM
1007 | str PC, SAVE_PC // Redundant (but a defined value).
1008 | bhi ->fff_fallback
1012 | bl extern lj_str_fromnumber // (lua_State *L, cTValue *o)
1013 | // Returns GCstr *.
1015 | mvn CARG2, #~LJ_TSTR
1018 |//-- Base library: iterators -------------------------------------------
1021 | mvn CARG4, #~LJ_TNIL
1022 | checktab CARG2, ->fff_fallback
1023 | strd CARG34, [BASE, NARGS8:RC] // Set missing 2nd arg to nil.
1024 | ldr PC, [BASE, FRAME_PC]
1026 | str BASE, L->base // Add frame since C call can throw.
1028 | str BASE, L->top // Dummy frame length is ok.
1029 | add CARG3, BASE, #8
1031 | bl extern lj_tab_next // (lua_State *L, GCtab *t, TValue *key)
1032 | // Returns 0 at end of traversal.
1033 | IOS ldr BASE, L->base
1035 | mvneq CRET2, #~LJ_TNIL
1036 | beq ->fff_restv // End of traversal: return nil.
1037 | ldrd CARG12, [BASE, #8] // Copy key and value to results.
1038 | ldrd CARG34, [BASE, #16]
1040 | strd CARG12, [BASE, #-8]
1041 | strd CARG34, [BASE]
1045 | checktab CARG2, ->fff_fallback
1046 #ifdef LUAJIT_ENABLE_LUA52COMPAT
1047 | ldr TAB:RB, TAB:CARG1->metatable
1049 | ldrd CFUNC:CARG34, CFUNC:CARG3->upvalue[0]
1050 | ldr PC, [BASE, FRAME_PC]
1051 #ifdef LUAJIT_ENABLE_LUA52COMPAT
1053 | bne ->fff_fallback
1055 | mvn CARG2, #~LJ_TNIL
1057 | strd CFUNC:CARG34, [BASE, #-8]
1058 | str CARG2, [BASE, #12]
1061 |.ffunc_2 ipairs_aux
1062 | checktp CARG2, LJ_TTAB
1063 | checktpeq CARG4, LJ_TISNUM
1064 | bne ->fff_fallback
1065 | ldr RB, TAB:CARG1->asize
1066 | ldr RC, TAB:CARG1->array
1067 | add CARG3, CARG3, #1
1068 | ldr PC, [BASE, FRAME_PC]
1070 | add RC, RC, CARG3, lsl #3
1071 | strd CARG34, [BASE, #-8]
1072 | ldrdlo CARG12, [RC]
1074 | bhs >2 // Not in array part?
1076 | checktp CARG2, LJ_TNIL
1077 | movne RC, #(2+1)*8
1078 | strdne CARG12, [BASE]
1080 |2: // Check for empty hash part first. Otherwise call C function.
1081 | ldr RB, TAB:CARG1->hmask
1086 | bl extern lj_tab_getinth // (GCtab *t, int32_t key)
1087 | // Returns cTValue * or NULL.
1091 | ldrd CARG12, [CRET1]
1095 | checktab CARG2, ->fff_fallback
1096 #ifdef LUAJIT_ENABLE_LUA52COMPAT
1097 | ldr TAB:RB, TAB:CARG1->metatable
1099 | ldrd CFUNC:CARG34, CFUNC:CARG3->upvalue[0]
1100 | ldr PC, [BASE, FRAME_PC]
1101 #ifdef LUAJIT_ENABLE_LUA52COMPAT
1103 | bne ->fff_fallback
1106 | mvn CARG2, #~LJ_TISNUM
1108 | strd CFUNC:CARG34, [BASE, #-8]
1109 | strd CARG12, [BASE, #8]
1112 |//-- Base library: catch errors ----------------------------------------
1115 | ldrb RA, [DISPATCH, #DISPATCH_GL(hookmask)]
1117 | blo ->fff_fallback
1118 | tst RA, #HOOK_ACTIVE // Remember active hook before pcall.
1120 | add BASE, BASE, #8
1121 | moveq PC, #8+FRAME_PCALL
1122 | movne PC, #8+FRAME_PCALLH
1123 | sub NARGS8:RC, NARGS8:RC, #8
1124 | b ->vm_call_dispatch
1127 | ldrb RA, [DISPATCH, #DISPATCH_GL(hookmask)]
1128 | checkfunc CARG4, ->fff_fallback // Traceback must be a function.
1130 | strd CARG12, [BASE, #8] // Swap function and traceback.
1131 | strd CARG34, [BASE]
1132 | tst RA, #HOOK_ACTIVE // Remember active hook before pcall.
1133 | add BASE, BASE, #16
1134 | moveq PC, #16+FRAME_PCALL
1135 | movne PC, #16+FRAME_PCALLH
1136 | sub NARGS8:RC, NARGS8:RC, #16
1137 | b ->vm_call_dispatch
1139 |//-- Coroutine library --------------------------------------------------
1141 |.macro coroutine_resume_wrap, resume
1143 |.ffunc_1 coroutine_resume
1144 | checktp CARG2, LJ_TTHREAD
1145 | bne ->fff_fallback
1147 |.ffunc coroutine_wrap_aux
1148 | ldr L:CARG1, CFUNC:CARG3->upvalue[0].gcr
1150 | ldr PC, [BASE, FRAME_PC]
1152 | ldr CARG2, L:CARG1->top
1153 | ldrb RA, L:CARG1->status
1154 | ldr RB, L:CARG1->base
1155 | add CARG3, CARG2, NARGS8:RC
1156 | add CARG4, CARG2, RA
1159 | beq ->fff_fallback
1160 | ldr CARG4, L:CARG1->maxstack
1161 | ldr RB, L:CARG1->cframe
1162 | cmp RA, #LUA_YIELD
1163 | cmpls CARG3, CARG4
1165 | bhi ->fff_fallback
1168 | sub CARG3, CARG3, #8 // Keep resumed thread in stack for GC.
1169 | add BASE, BASE, #8
1170 | sub NARGS8:RC, NARGS8:RC, #8
1172 | str CARG3, L:CARG1->top
1174 |2: // Move args to coroutine.
1175 | ldrd CARG34, [BASE, RB]
1177 | strdne CARG34, [CARG2, RB]
1184 | bl ->vm_resume // (lua_State *L, TValue *base, 0, 0)
1185 | // Returns thread status.
1187 | ldr CARG3, L:RA->base
1188 | mv_vmstate CARG2, INTERP
1189 | ldr CARG4, L:RA->top
1191 | cmp CRET1, #LUA_YIELD
1194 | subs RC, CARG4, CARG3
1195 | ldr CARG1, L->maxstack
1196 | add CARG2, BASE, RC
1197 | beq >6 // No results?
1200 | bhi >9 // Need to grow stack?
1203 | str CARG3, L:RA->top // Clear coroutine stack.
1204 |5: // Move results from coroutine.
1205 | ldrd CARG12, [CARG3, RB]
1207 | strd CARG12, [BASE, RB]
1212 | mvn CARG3, #~LJ_TTRUE
1215 | str CARG3, [BASE, #-4] // Prepend true/false to results.
1221 | ands CARG1, PC, #FRAME_TYPE
1223 | str RC, SAVE_MULTRES
1227 |8: // Coroutine returned with error (at co->top-1).
1229 | ldrd CARG12, [CARG4, #-8]!
1230 | mvn CARG3, #~LJ_TFALSE
1232 | str CARG4, L:RA->top // Remove error from coroutine stack.
1233 | strd CARG12, [BASE] // Copy error message.
1238 | bl extern lj_ffh_coroutine_wrap_err // (lua_State *L, lua_State *co)
1242 |9: // Handle stack expansion on return from yield.
1245 | bl extern lj_state_growstack // (lua_State *L, int n)
1250 | coroutine_resume_wrap 1 // coroutine.resume
1251 | coroutine_resume_wrap 0 // coroutine.wrap
1253 |.ffunc coroutine_yield
1254 | ldr CARG1, L->cframe
1255 | add CARG2, BASE, NARGS8:RC
1257 | tst CARG1, #CFRAME_RESUME
1259 | mov CRET1, #LUA_YIELD
1261 | beq ->fff_fallback
1262 | str CARG3, L->cframe
1263 | strb CRET1, L->status
1266 |//-- Math library -------------------------------------------------------
1268 |.macro math_round, func
1269 | .ffunc_1 math_ .. func
1270 | checktp CARG2, LJ_TISNUM
1272 | bhi ->fff_fallback
1273 | // Round FP value and normalize result.
1274 | lsl CARG3, CARG2, #1
1275 | adds RB, CARG3, #0x00200000
1276 | bpl >2 // |x| < 1?
1278 | subs RB, CARG4, RB, asr #21
1279 | lsl CARG4, CARG2, #11
1280 | lsl CARG3, CARG1, #11
1281 | orr CARG4, CARG4, #0x80000000
1283 | orr CARG4, CARG4, CARG1, lsr #21
1284 | bls >3 // |x| >= 2^31?
1285 | orr CARG3, CARG3, CARG4, lsl INS
1286 | lsr CARG1, CARG4, RB
1287 |.if "func" == "floor"
1288 | tst CARG3, CARG2, asr #31
1289 | addne CARG1, CARG1, #1
1291 | bics CARG3, CARG3, CARG2, asr #31
1292 | addsne CARG1, CARG1, #1
1297 | rsblt CARG1, CARG1, #0
1299 | mvn CARG2, #~LJ_TISNUM
1303 | orr CARG3, CARG3, CARG1 // ztest = abs(hi) | lo
1304 |.if "func" == "floor"
1305 | tst CARG3, CARG2, asr #31 // return (ztest & sign) == 0 ? 0 : -1
1309 | bics CARG3, CARG3, CARG2, asr #31 // return (ztest & ~sign) == 0 ? 0 : 1
1313 | mvn CARG2, #~LJ_TISNUM
1316 |3: // |x| >= 2^31. Check for x == -(2^31).
1317 | cmpeq CARG4, #0x80000000
1318 |.if "func" == "floor"
1323 | movmi CARG1, #0x80000000
1335 | .long 0x00000000, 0x41e00000 // 2^31.
1338 | checktp CARG2, LJ_TISNUM
1339 | bhi ->fff_fallback
1340 | bicne CARG2, CARG2, #0x80000000
1343 | rsbslt CARG1, CARG1, #0
1348 | // CARG12 = TValue result.
1349 | ldr PC, [BASE, FRAME_PC]
1350 | strd CARG12, [BASE, #-8]
1355 | // RC = (nresults+1)*8, PC = return.
1356 | ands CARG1, PC, #FRAME_TYPE
1357 | ldreq INS, [PC, #-4]
1358 | str RC, SAVE_MULTRES
1361 | decode_RB8 RB, INS
1363 | cmp RB, RC // More results expected?
1365 | decode_RA8 CARG1, INS
1368 | // Adjust BASE. KBASE is assumed to be set for the calling frame.
1369 | sub BASE, RA, CARG1
1372 |6: // Fill up results with nil.
1374 | mvn CARG1, #~LJ_TNIL
1376 | str CARG1, [CARG2, #-4]
1379 |.macro math_extern, func
1380 | .ffunc_n math_ .. func
1387 |.macro math_extern2, func
1388 | .ffunc_nn math_ .. func
1409 | math_extern2 atan2
1414 | ldrd CARG34, CFUNC:CARG3->upvalue[0]
1415 | bl extern __aeabi_dmul
1418 |.ffunc_2 math_ldexp
1419 | checktp CARG2, LJ_TISNUM
1420 | bhs ->fff_fallback
1421 | checktp CARG4, LJ_TISNUM
1422 | bne ->fff_fallback
1424 | bl extern ldexp // (double x, int exp)
1428 |.ffunc_n math_frexp
1434 | mvn CARG4, #~LJ_TISNUM
1435 | ldr PC, [BASE, FRAME_PC]
1436 | strd CARG12, [BASE, #-8]
1438 | strd CARG34, [BASE]
1442 | sub CARG3, BASE, #8
1443 | ldr PC, [BASE, FRAME_PC]
1448 | strd CARG12, [BASE]
1451 |.macro math_minmax, name, cond, fcond
1453 | checktp CARG2, LJ_TISNUM
1456 |1: // Handle integers.
1457 | ldrd CARG34, [BASE, RA]
1460 | checktp CARG4, LJ_TISNUM
1464 | mov..cond CARG1, CARG3
1467 | bhi ->fff_fallback
1468 | // Convert intermediate result to number and continue below.
1469 | bl extern __aeabi_i2d
1470 | ldrd CARG34, [BASE, RA]
1474 | bhi ->fff_fallback
1475 |5: // Handle numbers.
1476 | ldrd CARG34, [BASE, RA]
1479 | checktp CARG4, LJ_TISNUM
1482 | bl extern __aeabi_cdcmple
1484 | mov..fcond CARG1, CARG3
1485 | mov..fcond CARG2, CARG4
1487 |7: // Convert integer to number and continue above.
1488 | bhi ->fff_fallback
1491 | bl extern __aeabi_i2d
1496 | math_minmax math_min, gt, hi
1497 | math_minmax math_max, lt, lo
1499 |//-- String library -----------------------------------------------------
1501 |.ffunc_1 string_len
1502 | checkstr CARG2, ->fff_fallback
1503 | ldr CARG1, STR:CARG1->len
1504 | mvn CARG2, #~LJ_TISNUM
1507 |.ffunc string_byte // Only handle the 1-arg case here.
1508 | ldrd CARG12, [BASE]
1509 | ldr PC, [BASE, FRAME_PC]
1511 | checktpeq CARG2, LJ_TSTR // Need exactly 1 argument.
1512 | bne ->fff_fallback
1513 | ldr CARG3, STR:CARG1->len
1514 | ldrb CARG1, STR:CARG1[1] // Access is always ok (NUL at end).
1515 | mvn CARG2, #~LJ_TISNUM
1517 | moveq RC, #(0+1)*8
1518 | movne RC, #(1+1)*8
1519 | strd CARG12, [BASE, #-8]
1522 |.ffunc string_char // Only handle the 1-arg case here.
1524 | ldrd CARG12, [BASE]
1525 | ldr PC, [BASE, FRAME_PC]
1526 | cmp NARGS8:RC, #8 // Need exactly 1 argument.
1527 | checktpeq CARG2, LJ_TISNUM
1528 | bicseq CARG4, CARG1, #255
1530 | bne ->fff_fallback
1532 | mov CARG2, TMPDp // Points to stack. Little-endian.
1534 | // CARG2 = str, CARG3 = len.
1538 | bl extern lj_str_new // (lua_State *L, char *str, size_t l)
1539 | // Returns GCstr *.
1541 | mvn CARG2, #~LJ_TSTR
1546 | ldrd CARG12, [BASE]
1547 | ldrd CARG34, [BASE, #16]
1548 | cmp NARGS8:RC, #16
1551 | blo ->fff_fallback
1552 | checktp CARG4, LJ_TISNUM
1554 | bne ->fff_fallback
1556 | ldrd CARG34, [BASE, #8]
1557 | checktp CARG2, LJ_TSTR
1558 | ldreq CARG2, STR:CARG1->len
1559 | checktpeq CARG4, LJ_TISNUM
1560 | bne ->fff_fallback
1561 | // CARG1 = str, CARG2 = str->len, CARG3 = start, RB = end
1562 | add CARG4, CARG2, #1
1563 | cmp CARG3, #0 // if (start < 0) start += len+1
1564 | addlt CARG3, CARG3, CARG4
1565 | cmp CARG3, #1 // if (start < 1) start = 1
1567 | cmp RB, #0 // if (end < 0) end += len+1
1568 | addlt RB, RB, CARG4
1569 | bic RB, RB, RB, asr #31 // if (end < 0) end = 0
1570 | cmp RB, CARG2 // if (end > len) end = len
1571 | add CARG1, STR:CARG1, #sizeof(GCstr)-1
1573 | add CARG2, CARG1, CARG3
1574 | subs CARG3, RB, CARG3 // len = end - start
1575 | add CARG3, CARG3, #1 // len += 1
1578 | sub STR:CARG1, DISPATCH, #-DISPATCH_GL(strempty)
1579 | mvn CARG2, #~LJ_TSTR
1582 |.ffunc string_rep // Only handle the 1-char case inline.
1584 | ldrd CARG12, [BASE]
1585 | ldrd CARG34, [BASE, #8]
1586 | cmp NARGS8:RC, #16
1587 | blo ->fff_fallback
1588 | checktp CARG2, LJ_TSTR
1589 | checktpeq CARG4, LJ_TISNUM
1590 | bne ->fff_fallback
1591 | subs CARG4, CARG3, #1
1592 | ldr CARG2, STR:CARG1->len
1593 | blt ->fff_emptystr // Count <= 0?
1595 | blo ->fff_emptystr // Zero-length string?
1596 | bne ->fff_fallback // Fallback for > 1-char strings.
1597 | ldr RB, [DISPATCH, #DISPATCH_GL(tmpbuf.sz)]
1598 | ldr CARG2, [DISPATCH, #DISPATCH_GL(tmpbuf.buf)]
1599 | ldr CARG1, STR:CARG1[1]
1601 | blo ->fff_fallback
1602 |1: // Fill buffer with char.
1603 | strb CARG1, [CARG2, CARG4]
1604 | subs CARG4, CARG4, #1
1608 |.ffunc string_reverse
1610 | ldrd CARG12, [BASE]
1612 | blo ->fff_fallback
1613 | checkstr CARG2, ->fff_fallback
1614 | ldr CARG3, STR:CARG1->len
1615 | ldr RB, [DISPATCH, #DISPATCH_GL(tmpbuf.sz)]
1616 | ldr CARG2, [DISPATCH, #DISPATCH_GL(tmpbuf.buf)]
1618 | add CARG1, STR:CARG1, #sizeof(GCstr)
1620 | blo ->fff_fallback
1621 |1: // Reverse string copy.
1622 | ldrb RB, [CARG1], #1
1623 | subs CARG4, CARG4, #1
1625 | strb RB, [CARG2, CARG4]
1628 |.macro ffstring_case, name, lo
1631 | ldrd CARG12, [BASE]
1633 | blo ->fff_fallback
1634 | checkstr CARG2, ->fff_fallback
1635 | ldr CARG3, STR:CARG1->len
1636 | ldr RB, [DISPATCH, #DISPATCH_GL(tmpbuf.sz)]
1637 | ldr CARG2, [DISPATCH, #DISPATCH_GL(tmpbuf.buf)]
1639 | add CARG1, STR:CARG1, #sizeof(GCstr)
1641 | blo ->fff_fallback
1642 |1: // ASCII case conversion.
1643 | ldrb RB, [CARG1, CARG4]
1648 | eorlo RB, RB, #0x20
1649 | strb RB, [CARG2, CARG4]
1650 | add CARG4, CARG4, #1
1654 |ffstring_case string_lower, 65
1655 |ffstring_case string_upper, 97
1657 |//-- Table library ------------------------------------------------------
1659 |.ffunc_1 table_getn
1660 | checktab CARG2, ->fff_fallback
1662 | bl extern lj_tab_len // (GCtab *t)
1663 | // Returns uint32_t (but less than 2^31).
1665 | mvn CARG2, #~LJ_TISNUM
1668 |//-- Bit library --------------------------------------------------------
1670 |// FP number to bit conversion for soft-float. Clobbers r0-r3.
1672 | bhi ->fff_fallback
1675 | adds RB, RB, #0x00200000
1676 | movpl CARG1, #0 // |x| < 1?
1679 | subs RB, CARG4, RB, asr #21
1680 | bmi >1 // |x| >= 2^32?
1681 | lsl CARG4, CARG2, #11
1682 | orr CARG4, CARG4, #0x80000000
1683 | orr CARG4, CARG4, CARG1, lsr #21
1685 | lsr CARG1, CARG4, RB
1686 | rsblt CARG1, CARG1, #0
1690 | lsr CARG4, CARG1, RB
1692 | lsl CARG1, CARG2, #12
1694 | orr CARG1, CARG4, CARG1, lsl RB
1695 | rsblt CARG1, CARG1, #0
1698 |.macro .ffunc_bit, name
1699 | .ffunc_1 bit_..name
1700 | checktp CARG2, LJ_TISNUM
1701 | blne ->vm_tobit_fb
1705 | mvn CARG2, #~LJ_TISNUM
1708 |.macro .ffunc_bit_op, name, ins
1713 | ldrd CARG12, [BASE, RA]
1717 | checktp CARG2, LJ_TISNUM
1718 | blne ->vm_tobit_fb
1719 | ins CARG3, CARG3, CARG1
1723 |.ffunc_bit_op band, and
1724 |.ffunc_bit_op bor, orr
1725 |.ffunc_bit_op bxor, eor
1728 | mvn CARG4, #~LJ_TISNUM
1729 | ldr PC, [BASE, FRAME_PC]
1730 | strd CARG34, [BASE, #-8]
1734 | eor CARG3, CARG1, CARG1, ror #16
1735 | bic CARG3, CARG3, #0x00ff0000
1736 | ror CARG1, CARG1, #8
1737 | mvn CARG2, #~LJ_TISNUM
1738 | eor CARG1, CARG1, CARG3, lsr #8
1743 | mvn CARG2, #~LJ_TISNUM
1746 |.macro .ffunc_bit_sh, name, ins, shmod
1748 | ldrd CARG12, [BASE, #8]
1749 | cmp NARGS8:RC, #16
1750 | blo ->fff_fallback
1751 | checktp CARG2, LJ_TISNUM
1752 | blne ->vm_tobit_fb
1754 | and RA, CARG1, #31
1758 | ldrd CARG12, [BASE]
1759 | checktp CARG2, LJ_TISNUM
1760 | blne ->vm_tobit_fb
1761 | ins CARG1, CARG1, RA
1762 | mvn CARG2, #~LJ_TISNUM
1766 |.ffunc_bit_sh lshift, lsl, 0
1767 |.ffunc_bit_sh rshift, lsr, 0
1768 |.ffunc_bit_sh arshift, asr, 0
1769 |.ffunc_bit_sh rol, ror, 1
1770 |.ffunc_bit_sh ror, ror, 0
1772 |//-----------------------------------------------------------------------
1774 |->fff_fallback: // Call fast function fallback handler.
1775 | // BASE = new base, RC = nargs*8
1776 | ldr CARG3, [BASE, FRAME_FUNC]
1777 | ldr CARG2, L->maxstack
1778 | add CARG1, BASE, NARGS8:RC
1779 | ldr PC, [BASE, FRAME_PC] // Fallback may overwrite PC.
1781 | ldr CARG3, CFUNC:CARG3->f
1783 | add CARG1, CARG1, #8*LUA_MINSTACK
1784 | str PC, SAVE_PC // Redundant (but a defined value).
1787 | bhi >5 // Need to grow stack.
1788 | blx CARG3 // (lua_State *L)
1789 | // Either throws an error, or recovers and returns -1, 0 or nresults+1.
1794 | bgt ->fff_res // Returned nresults+1?
1795 |1: // Returned 0 or -1: retry fast path.
1797 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
1798 | sub NARGS8:RC, CARG1, BASE
1799 | bne ->vm_call_tail // Returned -1?
1800 | ins_callt // Returned 0: retry fast path.
1802 |// Reconstruct previous base for vmeta_call during tailcall.
1804 | ands CARG1, PC, #FRAME_TYPE
1805 | bic CARG2, PC, #FRAME_TYPEP
1806 | ldreq INS, [PC, #-4]
1807 | andeq CARG2, MASKR8, INS, lsr #5 // Conditional decode_RA8.
1808 | sub RB, BASE, CARG2
1809 | b ->vm_call_dispatch // Resolve again for tailcall.
1811 |5: // Grow stack for fallback handler.
1812 | mov CARG2, #LUA_MINSTACK
1813 | bl extern lj_state_growstack // (lua_State *L, int n)
1815 | cmp CARG1, CARG1 // Set zero-flag to force retry.
1818 |->fff_gcstep: // Call GC step function.
1819 | // BASE = new base, RC = nargs*8
1822 | add CARG2, BASE, NARGS8:RC
1823 | str PC, SAVE_PC // Redundant (but a defined value).
1826 | bl extern lj_gc_step // (lua_State *L)
1828 | mov lr, RA // Help return address predictor.
1829 | ldr CFUNC:CARG3, [BASE, FRAME_FUNC]
1832 |//-----------------------------------------------------------------------
1833 |//-- Special dispatch targets -------------------------------------------
1834 |//-----------------------------------------------------------------------
1836 |->vm_record: // Dispatch target for recording phase.
1838 | ldrb CARG1, [DISPATCH, #DISPATCH_GL(hookmask)]
1839 | tst CARG1, #HOOK_VMEVENT // No recording while in vmevent.
1841 | // Decrement the hookcount for consistency, but always do the call.
1842 | ldr CARG2, [DISPATCH, #DISPATCH_GL(hookcount)]
1843 | tst CARG1, #HOOK_ACTIVE
1845 | sub CARG2, CARG2, #1
1846 | tst CARG1, #LUA_MASKLINE|LUA_MASKCOUNT
1847 | strne CARG2, [DISPATCH, #DISPATCH_GL(hookcount)]
1851 |->vm_rethook: // Dispatch target for return hooks.
1852 | ldrb CARG1, [DISPATCH, #DISPATCH_GL(hookmask)]
1853 | tst CARG1, #HOOK_ACTIVE // Hook already active?
1855 |5: // Re-dispatch to static ins.
1857 | add OP, DISPATCH, OP, lsl #2
1858 | ldr pc, [OP, #GG_DISP2STATIC]
1860 |->vm_inshook: // Dispatch target for instr/line hooks.
1861 | ldrb CARG1, [DISPATCH, #DISPATCH_GL(hookmask)]
1862 | ldr CARG2, [DISPATCH, #DISPATCH_GL(hookcount)]
1863 | tst CARG1, #HOOK_ACTIVE // Hook already active?
1865 | tst CARG1, #LUA_MASKLINE|LUA_MASKCOUNT
1867 | subs CARG2, CARG2, #1
1868 | str CARG2, [DISPATCH, #DISPATCH_GL(hookcount)]
1870 | tst CARG1, #LUA_MASKLINE
1876 | // SAVE_PC must hold the _previous_ PC. The callee updates it with PC.
1877 | bl extern lj_dispatch_ins // (lua_State *L, const BCIns *pc)
1880 |4: // Re-dispatch to static ins.
1881 | ldrb OP, [PC, #-4]
1882 | ldr INS, [PC, #-4]
1883 | add OP, DISPATCH, OP, lsl #2
1884 | ldr OP, [OP, #GG_DISP2STATIC]
1885 | decode_RA8 RA, INS
1889 |->cont_hook: // Continue from hook yield.
1890 | ldr CARG1, [CARG4, #-24]
1892 | str CARG1, SAVE_MULTRES // Restore MULTRES for *M ins.
1895 |->vm_hotloop: // Hot loop counter underflow.
1897 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC] // Same as curr_topL(L).
1898 | sub CARG1, DISPATCH, #-GG_DISP2J
1900 | ldr CARG3, LFUNC:CARG3->field_pc
1902 | str L, [DISPATCH, #DISPATCH_J(L)]
1903 | ldrb CARG3, [CARG3, #PC2PROTO(framesize)]
1905 | add CARG3, BASE, CARG3, lsl #3
1907 | bl extern lj_trace_hot // (jit_State *J, const BCIns *pc)
1911 |->vm_callhook: // Dispatch target for call hooks.
1917 |->vm_hotcall: // Hot call counter underflow.
1922 | add CARG4, BASE, RC
1928 | bl extern lj_dispatch_call // (lua_State *L, const BCIns *pc)
1929 | // Returns ASMFunction.
1934 | sub NARGS8:RC, CARG4, BASE
1935 | str CARG2, SAVE_PC // Invalidate for subsequent line hook.
1936 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
1937 | ldr INS, [PC, #-4]
1940 |//-----------------------------------------------------------------------
1941 |//-- Trace exit handler -------------------------------------------------
1942 |//-----------------------------------------------------------------------
1947 | push {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12}
1948 | ldr CARG1, [sp, #64] // Load original value of lr.
1949 | ldr DISPATCH, [lr] // Load DISPATCH.
1950 | add CARG3, sp, #64 // Recompute original value of sp.
1951 | mv_vmstate CARG4, EXIT
1952 | str CARG3, [sp, #52] // Store sp in RID_SP
1954 | ldr CARG2, [CARG1, #-4]! // Get exit instruction.
1955 | str CARG1, [sp, #56] // Store exit pc in RID_LR and RID_PC.
1956 | str CARG1, [sp, #60]
1957 | lsl CARG2, CARG2, #8
1958 | add CARG1, CARG1, CARG2, asr #6
1959 | ldr CARG2, [lr, #4] // Load exit stub group offset.
1960 | sub CARG1, CARG1, lr
1961 | ldr L, [DISPATCH, #DISPATCH_GL(jit_L)]
1962 | add CARG1, CARG2, CARG1, lsr #2 // Compute exit number.
1963 | ldr BASE, [DISPATCH, #DISPATCH_GL(jit_base)]
1964 | str CARG1, [DISPATCH, #DISPATCH_J(exitno)]
1966 | str L, [DISPATCH, #DISPATCH_J(L)]
1968 | str CARG4, [DISPATCH, #DISPATCH_GL(jit_L)]
1969 | sub CARG1, DISPATCH, #-GG_DISP2J
1971 | bl extern lj_trace_exit // (jit_State *J, ExitState *ex)
1972 | // Returns MULTRES (unscaled) or negated error code.
1973 | ldr CARG2, L->cframe
1975 | bic CARG2, CARG2, #~CFRAME_RAWMASK // Use two steps: bic sp is deprecated.
1977 | ldr PC, SAVE_PC // Get SAVE_PC.
1978 | str L, SAVE_L // Set SAVE_L (on-trace resume/yield).
1982 | // CARG1 = MULTRES or negated error code, BASE, PC and DISPATCH set.
1987 | blt >3 // Check for error from exit.
1989 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
1990 | str RC, SAVE_MULTRES
1992 | ldr CARG2, LFUNC:CARG2->field_pc
1993 | str CARG3, [DISPATCH, #DISPATCH_GL(jit_L)]
1994 | mv_vmstate CARG4, INTERP
1995 | ldr KBASE, [CARG2, #PC2PROTO(k)]
1996 | // Modified copy of ins_next which handles function header dispatch, too.
2000 | lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
2002 | cmp OP, #BC_FUNCF // Function header?
2003 | ldr OP, [DISPATCH, OP, lsl #2]
2004 | decode_RA8 RA, INS
2005 | lsrlo RC, INS, #16 // No: Decode operands A*8 and D.
2007 | addhs RA, RA, BASE // Yes: RA = BASE+framesize*8, RC = nargs*8
2010 |3: // Rethrow error from the right C frame.
2011 | rsb CARG2, CARG1, #0
2013 | bl extern lj_err_throw // (lua_State *L, int errcode)
2016 |//-----------------------------------------------------------------------
2017 |//-- Math helper functions ----------------------------------------------
2018 |//-----------------------------------------------------------------------
2020 |// FP value rounding. Called from JIT code.
2022 |// double lj_vm_floor/ceil/trunc(double x);
2023 |.macro vm_round, func
2025 | lsl CARG3, CARG2, #1
2026 | adds RB, CARG3, #0x00200000
2027 | bpl >2 // |x| < 1?
2029 | subs RB, CARG4, RB, asr #21 // 2^0: RB = 51, 2^51: RB = 0.
2030 | bxlo lr // |x| >= 2^52: done.
2032 | bic CARG3, CARG1, CARG4, lsl RB // ztest = lo & ~lomask
2033 | and CARG1, CARG1, CARG4, lsl RB // lo &= lomask
2035 | bicpl CARG4, CARG2, CARG4, lsl RB // |x| <= 2^20: ztest |= hi & ~himask
2036 | orrpl CARG3, CARG3, CARG4
2038 | andpl CARG2, CARG2, CARG4, lsl RB // |x| <= 2^20: hi &= himask
2039 |.if "func" == "floor"
2040 | tst CARG3, CARG2, asr #31 // iszero = ((ztest & signmask) == 0)
2042 | bics CARG3, CARG3, CARG2, asr #31 // iszero = ((ztest & ~signmask) == 0)
2044 | bxeq lr // iszero: done.
2047 | lslpl CARG3, CARG4, RB
2050 | subs CARG1, CARG1, CARG4, lsl RB // lo = lo-lomask
2051 | sbc CARG2, CARG2, CARG3 // hi = hi-himask+carry
2055 | orr CARG3, CARG3, CARG1 // ztest = (2*hi) | lo
2056 |.if "func" == "floor"
2057 | tst CARG3, CARG2, asr #31 // iszero = ((ztest & signmask) == 0)
2059 | bics CARG3, CARG3, CARG2, asr #31 // iszero = ((ztest & ~signmask) == 0)
2061 | mov CARG1, #0 // lo = 0
2062 | and CARG2, CARG2, #0x80000000
2063 | ldrne CARG4, <9 // hi = sign(x) | (iszero ? 0.0 : 1.0)
2064 | orrne CARG2, CARG2, CARG4
2069 | .long 0x3ff00000 // hiword(1.0)
2075 | lsl CARG3, CARG2, #1
2076 | adds RB, CARG3, #0x00200000
2077 | andpl CARG2, CARG2, #0x80000000 // |x| < 1? hi = sign(x), lo = 0.
2081 | subs RB, CARG4, RB, asr #21 // 2^0: RB = 51, 2^51: RB = 0.
2082 | bxlo lr // |x| >= 2^52: already done.
2084 | and CARG1, CARG1, CARG4, lsl RB // lo &= lomask
2086 | andpl CARG2, CARG2, CARG4, lsl RB // |x| <= 2^20: hi &= himask
2090 | // double lj_vm_mod(double dividend, double divisor);
2092 | push {r0, r1, r2, r3, r4, lr}
2093 | bl extern __aeabi_ddiv
2095 | ldrd CARG34, [sp, #8]
2096 | bl extern __aeabi_dmul
2098 | eor CARG2, CARG2, #0x80000000
2099 | bl extern __aeabi_dadd
2103 | // int lj_vm_modi(int dividend, int divisor);
2105 | ands RB, CARG1, #0x80000000
2106 | rsbmi CARG1, CARG1, #0 // a = |dividend|
2107 | eor RB, RB, CARG2, asr #1 // Keep signdiff and sign(divisor).
2109 | rsbmi CARG2, CARG2, #0 // b = |divisor|
2110 | subs CARG4, CARG2, #1
2111 | cmpne CARG1, CARG2
2112 | moveq CARG1, #0 // if (b == 1 || a == b) a = 0
2113 | tsthi CARG2, CARG4
2114 | andeq CARG1, CARG1, CARG4 // else if ((b & (b-1)) == 0) a &= b-1
2116 | // Use repeated subtraction to get the remainder.
2119 | sub CARG4, CARG4, CARG3
2120 | rsbs CARG3, CARG4, #31 // entry = (31-(clz(b)-clz(a)))*8
2121 | addne pc, pc, CARG3, lsl #3 // Duff's device.
2125 for (i = 31; i >= 0; i--) {
2126 | cmp CARG1, CARG2, lsl #i
2127 | subhs CARG1, CARG1, CARG2, lsl #i
2133 | submi CARG1, CARG1, CARG2 // if (y != 0 && signdiff) y = y - b
2134 | eors CARG2, CARG1, RB, lsl #1
2135 | rsbmi CARG1, CARG1, #0 // if (sign(divisor) != sign(y)) y = -y
2138 |// Callable from C: double lj_vm_foldarith(double x, double y, int op)
2139 |// Compute x op y for basic arithmetic operators (+ - * / % ^ and unary -)
2140 |// and basic math functions. ORDER ARITH
2144 | blo extern __aeabi_dadd
2145 | beq extern __aeabi_dsub
2147 | blo extern __aeabi_dmul
2148 | beq extern __aeabi_ddiv
2153 | eorlo CARG2, CARG2, #0x80000000
2154 | biceq CARG2, CARG2, #0x80000000
2159 | beq >9 // No support needed for IR_LDEXP.
2165 | bl extern __aeabi_cdcmple
2166 | movhi CARG1, CARG3
2167 | movhi CARG2, CARG4
2173 | bl extern __aeabi_cdcmple
2174 | movlo CARG1, CARG3
2175 | movlo CARG2, CARG4
2178 | NYI // Other operations only needed by JIT compiler.
2181 |//-----------------------------------------------------------------------
2182 |//-- Miscellaneous functions --------------------------------------------
2183 |//-----------------------------------------------------------------------
2185 |//-----------------------------------------------------------------------
2186 |//-- FFI helper functions -----------------------------------------------
2187 |//-----------------------------------------------------------------------
2189 |// Handler for callback functions.
2190 |// Saveregs already performed. Callback slot number in [sp], g in r12.
2193 |.type CTSTATE, CTState, PC
2194 | ldr CTSTATE, GL:r12->ctype_state
2195 | add DISPATCH, r12, #GG_G2DISP
2196 | strd CARG12, CTSTATE->cb.gpr[0]
2197 | strd CARG34, CTSTATE->cb.gpr[2]
2199 | add CARG3, sp, #CFRAME_SIZE
2200 | mov CARG1, CTSTATE
2201 | lsr CARG4, CARG4, #3
2202 | str CARG3, CTSTATE->cb.stack
2204 | str CARG4, CTSTATE->cb.slot
2205 | str CTSTATE, SAVE_PC // Any value outside of bytecode is ok.
2206 | bl extern lj_ccallback_enter // (CTState *cts, void *cf)
2207 | // Returns lua_State *.
2208 | ldr BASE, L:CRET1->base
2209 | mv_vmstate CARG2, INTERP
2210 | ldr RC, L:CRET1->top
2212 | ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
2215 | lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
2220 |->cont_ffi_callback: // Return from FFI callback.
2222 | ldr CTSTATE, [DISPATCH, #DISPATCH_GL(ctype_state)]
2226 | mov CARG1, CTSTATE
2228 | bl extern lj_ccallback_leave // (CTState *cts, TValue *o)
2229 | ldrd CARG12, CTSTATE->cb.gpr[0]
2233 |->vm_ffi_call: // Call C function via FFI.
2234 | // Caveat: needs special frame unwinding, see below.
2236 | .type CCSTATE, CCallState, r4
2237 | push {CCSTATE, r5, r11, lr}
2238 | mov CCSTATE, CARG1
2239 | ldr CARG1, CCSTATE:CARG1->spadj
2240 | ldrb CARG2, CCSTATE->nsp
2241 | add CARG3, CCSTATE, #offsetof(CCallState, stack)
2243 | sub sp, sp, CARG1 // Readjust stack.
2244 | subs CARG2, CARG2, #1
2245 | ldr RB, CCSTATE->func
2247 |1: // Copy stack slots.
2248 | ldr CARG4, [CARG3, CARG2, lsl #2]
2249 | str CARG4, [sp, CARG2, lsl #2]
2250 | subs CARG2, CARG2, #1
2253 | ldr CARG1, CCSTATE->gpr[0]
2254 | ldr CARG2, CCSTATE->gpr[1]
2255 | ldr CARG3, CCSTATE->gpr[2]
2256 | ldr CARG4, CCSTATE->gpr[3]
2259 | str CRET1, CCSTATE->gpr[0]
2260 | str CRET2, CCSTATE->gpr[1]
2261 | pop {CCSTATE, r5, r11, pc}
2263 |// Note: vm_ffi_call must be the last function in this object file!
2265 |//-----------------------------------------------------------------------
2268 /* Generate the code for a single instruction. */
2269 static void build_ins(BuildCtx *ctx, BCOp op, int defop)
2276 /* -- Comparison ops ---------------------------------------------------- */
2278 /* Remember: all ops branch for a true comparison, fall through otherwise. */
2280 case BC_ISLT: case BC_ISGE: case BC_ISLE: case BC_ISGT:
2281 | // RA = src1*8, RC = src2, JMP with RC = target
2283 | ldrd CARG12, [RA, BASE]!
2285 | ldrd CARG34, [RC, BASE]!
2287 | add RB, PC, RB, lsl #2
2288 | checktp CARG2, LJ_TISNUM
2290 | checktp CARG4, LJ_TISNUM
2293 if (op == BC_ISLT) {
2294 | sublt PC, RB, #0x20000
2295 } else if (op == BC_ISGE) {
2296 | subge PC, RB, #0x20000
2297 } else if (op == BC_ISLE) {
2298 | suble PC, RB, #0x20000
2300 | subgt PC, RB, #0x20000
2305 |3: // CARG12 is not an integer.
2307 | // CARG12 is a number.
2308 | checktp CARG4, LJ_TISNUM
2309 | movlo RA, RB // Save RB.
2311 | // CARG12 is a number, CARG3 is an integer.
2314 | mov RA, RB // Save RB.
2315 | bl extern __aeabi_i2d
2318 | ldrd CARG12, [RC] // Restore first operand.
2320 |4: // CARG1 is an integer, CARG34 is not an integer.
2322 | // CARG1 is an integer, CARG34 is a number
2323 | mov RA, RB // Save RB.
2324 | bl extern __aeabi_i2d
2325 | ldrd CARG34, [RC] // Restore second operand.
2326 |5: // CARG12 and CARG34 are numbers.
2327 | bl extern __aeabi_cdcmple
2328 | // To preserve NaN semantics GE/GT branch on unordered, but LT/LE don't.
2329 if (op == BC_ISLT) {
2330 | sublo PC, RA, #0x20000
2331 } else if (op == BC_ISGE) {
2332 | subhs PC, RA, #0x20000
2333 } else if (op == BC_ISLE) {
2334 | subls PC, RA, #0x20000
2336 | subhi PC, RA, #0x20000
2341 case BC_ISEQV: case BC_ISNEV:
2342 vk = op == BC_ISEQV;
2343 | // RA = src1*8, RC = src2, JMP with RC = target
2345 | ldrd CARG12, [RA, BASE]!
2347 | ldrd CARG34, [RC, BASE]!
2349 | add RB, PC, RB, lsl #2
2350 | checktp CARG2, LJ_TISNUM
2351 | cmnls CARG4, #-LJ_TISNUM
2357 | // Either or both types are not numbers.
2359 | checktp CARG2, LJ_TCDATA
2360 | checktpne CARG4, LJ_TCDATA
2361 | beq ->vmeta_equal_cd
2363 | cmp CARG2, CARG4 // Compare types.
2364 | bne >2 // Not the same type?
2365 | checktp CARG2, LJ_TISPRI
2366 | bhs >1 // Same type and primitive type?
2368 | // Same types and not a primitive type. Compare GCobj or pvalue.
2371 | bne >3 // Different GCobjs or pvalues?
2372 |1: // Branch if same.
2373 | sub PC, RB, #0x20000
2377 | checktp CARG2, LJ_TISTABUD
2378 | bhi <2 // Different objects and not table/ud?
2380 | beq >1 // Same GCobjs or pvalues?
2381 | checktp CARG2, LJ_TISTABUD
2382 | bhi >2 // Different objects and not table/ud?
2384 | // Different tables or userdatas. Need to check __eq metamethod.
2385 | // Field metatable must be at same offset for GCtab and GCudata!
2386 | ldr TAB:RA, TAB:CARG1->metatable
2389 | beq <2 // No metatable?
2391 | beq >2 // No metatable?
2393 | ldrb RA, TAB:RA->nomm
2394 | mov CARG4, #1-vk // ne = 0 or 1.
2397 | beq ->vmeta_equal // 'no __eq' flag not set?
2401 |2: // Branch if different.
2402 | sub PC, RB, #0x20000
2408 case BC_ISEQS: case BC_ISNES:
2409 vk = op == BC_ISEQS;
2410 | // RA = src*8, RC = str_const (~), JMP with RC = target
2412 | ldrd CARG12, [BASE, RA]
2414 | ldr STR:CARG3, [KBASE, RC, lsl #2]
2416 | add RB, PC, RB, lsl #2
2417 | checktp CARG2, LJ_TSTR
2422 | cmpeq CARG1, CARG3
2425 | subeq PC, RB, #0x20000
2429 | subne PC, RB, #0x20000
2435 | checktp CARG2, LJ_TCDATA
2437 | b ->vmeta_equal_cd
2441 case BC_ISEQN: case BC_ISNEN:
2442 vk = op == BC_ISEQN;
2443 | // RA = src*8, RC = num_const (~), JMP with RC = target
2445 | ldrd CARG12, [RA, BASE]!
2447 | ldrd CARG34, [RC, KBASE]!
2449 | add RB, PC, RB, lsl #2
2455 | checktp CARG2, LJ_TISNUM
2457 | checktp CARG4, LJ_TISNUM
2461 | subeq PC, RB, #0x20000
2465 | subne PC, RB, #0x20000
2470 |3: // CARG12 is not an integer.
2475 | subhi PC, RB, #0x20000
2479 | // CARG12 is a number.
2480 | checktp CARG4, LJ_TISNUM
2481 | movlo RA, RB // Save RB.
2483 | // CARG12 is a number, CARG3 is an integer.
2486 |4: // CARG1 is an integer, CARG34 is a number.
2487 | mov RA, RB // Save RB.
2488 | bl extern __aeabi_i2d
2489 | ldrd CARG34, [RC] // Restore other operand.
2490 |5: // CARG12 and CARG34 are numbers.
2491 | bl extern __aeabi_cdcmpeq
2493 | subeq PC, RA, #0x20000
2495 | subne PC, RA, #0x20000
2501 | checktp CARG2, LJ_TCDATA
2503 | b ->vmeta_equal_cd
2507 case BC_ISEQP: case BC_ISNEP:
2508 vk = op == BC_ISEQP;
2509 | // RA = src*8, RC = primitive_type (~), JMP with RC = target
2510 | ldrd CARG12, [BASE, RA]
2514 | add RB, PC, RB, lsl #2
2516 | checktp CARG2, LJ_TCDATA
2517 | beq ->vmeta_equal_cd
2521 | subeq PC, RB, #0x20000
2523 | subne PC, RB, #0x20000
2528 /* -- Unary test and copy ops ------------------------------------------- */
2530 case BC_ISTC: case BC_ISFC: case BC_IST: case BC_ISF:
2531 | // RA = dst*8 or unused, RC = src, JMP with RC = target
2532 | add RC, BASE, RC, lsl #3
2536 | add RB, PC, RB, lsl #2
2537 | checktp CARG2, LJ_TTRUE
2538 if (op == BC_ISTC || op == BC_IST) {
2539 | subls PC, RB, #0x20000
2540 if (op == BC_ISTC) {
2541 | strdls CARG12, [BASE, RA]
2544 | subhi PC, RB, #0x20000
2545 if (op == BC_ISFC) {
2546 | strdhi CARG12, [BASE, RA]
2552 /* -- Unary ops --------------------------------------------------------- */
2555 | // RA = dst*8, RC = src
2558 | ldrd CARG12, [BASE, RC]
2560 | strd CARG12, [BASE, RA]
2564 | // RA = dst*8, RC = src
2565 | add RC, BASE, RC, lsl #3
2567 | ldr CARG1, [RC, #4]
2570 | checktp CARG1, LJ_TTRUE
2571 | mvnls CARG2, #~LJ_TFALSE
2572 | mvnhi CARG2, #~LJ_TTRUE
2573 | str CARG2, [RA, #4]
2577 | // RA = dst*8, RC = src
2579 | ldrd CARG12, [BASE, RC]
2582 | checktp CARG2, LJ_TISNUM
2584 | eorne CARG2, CARG2, #0x80000000
2586 | rsbseq CARG1, CARG1, #0
2589 | strd CARG12, [BASE, RA]
2594 | .long 0x00000000, 0x41e00000 // 2^31.
2597 | // RA = dst*8, RC = src
2599 | ldrd CARG12, [BASE, RC]
2600 | checkstr CARG2, >2
2601 | ldr CARG1, STR:CARG1->len
2603 | mvn CARG2, #~LJ_TISNUM
2606 | strd CARG12, [BASE, RA]
2609 | checktab CARG2, ->vmeta_len
2610 #ifdef LUAJIT_ENABLE_LUA52COMPAT
2611 | ldr TAB:CARG3, TAB:CARG1->metatable
2618 | bl extern lj_tab_len // (GCtab *t)
2619 | // Returns uint32_t (but less than 2^31).
2622 #ifdef LUAJIT_ENABLE_LUA52COMPAT
2624 | ldrb CARG4, TAB:CARG3->nomm
2625 | tst CARG4, #1<<MM_len
2626 | bne <3 // 'no __len' flag set: done.
2631 /* -- Binary ops -------------------------------------------------------- */
2633 |.macro ins_arithcheck, cond, ncond, target
2635 | cmn CARG4, #-LJ_TISNUM
2636 | cmn..cond CARG2, #-LJ_TISNUM
2638 | cmn CARG2, #-LJ_TISNUM
2639 | cmn..cond CARG4, #-LJ_TISNUM
2643 |.macro ins_arithcheck_int, target
2644 | ins_arithcheck eq, ne, target
2646 |.macro ins_arithcheck_num, target
2647 | ins_arithcheck lo, hs, target
2650 |.macro ins_arithpre
2651 | decode_RB8 RB, INS
2652 | decode_RC8 RC, INS
2653 | // RA = dst*8, RB = src1*8, RC = src2*8 | num_const*8
2654 ||vk = ((int)op - BC_ADDVN) / (BC_ADDNV-BC_ADDVN);
2657 | ldrd CARG12, [BASE, RB]
2658 | ldrd CARG34, [KBASE, RC]
2661 | ldrd CARG34, [BASE, RB]
2662 | ldrd CARG12, [KBASE, RC]
2665 | ldrd CARG12, [BASE, RB]
2666 | ldrd CARG34, [BASE, RC]
2671 |.macro ins_arithfallback, ins
2674 | ins ->vmeta_arith_vn
2677 | ins ->vmeta_arith_nv
2680 | ins ->vmeta_arith_vv
2685 |.macro ins_arithdn, intins, fpcall
2687 |.if "intins" ~= "vm_modi"
2690 | ins_arithcheck_int >5
2691 |.if "intins" == "smull"
2692 | smull CARG1, RC, CARG3, CARG1
2693 | cmp RC, CARG1, asr #31
2694 | ins_arithfallback bne
2695 |.elif "intins" == "vm_modi"
2697 | ins_arithfallback beq
2699 | mvn CARG2, #~LJ_TISNUM
2701 | intins CARG1, CARG1, CARG3
2702 | ins_arithfallback bvs
2705 |.if "intins" == "vm_modi"
2709 | strd CARG12, [BASE, RA]
2712 | ins_arithfallback ins_arithcheck_num
2713 |.if "intins" == "vm_modi"
2722 |.macro ins_arithfp, fpcall
2724 | ins_arithfallback ins_arithcheck_num
2725 |.if "fpcall" == "extern pow"
2734 | strd CARG12, [BASE, RA]
2738 case BC_ADDVN: case BC_ADDNV: case BC_ADDVV:
2739 | ins_arithdn adds, extern __aeabi_dadd
2741 case BC_SUBVN: case BC_SUBNV: case BC_SUBVV:
2742 | ins_arithdn subs, extern __aeabi_dsub
2744 case BC_MULVN: case BC_MULNV: case BC_MULVV:
2745 | ins_arithdn smull, extern __aeabi_dmul
2747 case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
2748 | ins_arithfp extern __aeabi_ddiv
2750 case BC_MODVN: case BC_MODNV: case BC_MODVV:
2751 | ins_arithdn vm_modi, ->vm_mod
2754 | // NYI: (partial) integer arithmetic.
2755 | ins_arithfp extern pow
2759 | decode_RB8 RC, INS
2760 | decode_RC8 RB, INS
2761 | // RA = dst*8, RC = src_start*8, RB = src_end*8 (note: RB/RC swapped!)
2764 | add CARG2, BASE, RB
2766 | // RA = dst*8, RC = src_start*8, CARG2 = top-1
2769 | lsr CARG3, CARG3, #3
2770 | bl extern lj_meta_cat // (lua_State *L, TValue *top, int left)
2771 | // Returns NULL (finished) or TValue * (metamethod).
2775 | ldrd CARG34, [BASE, RC]
2778 | strd CARG34, [BASE, RA] // Copy result to RA.
2782 /* -- Constant ops ------------------------------------------------------ */
2785 | // RA = dst*8, RC = str_const (~)
2788 | ldr CARG1, [KBASE, RC, lsl #2]
2789 | mvn CARG2, #~LJ_TSTR
2791 | strd CARG12, [BASE, RA]
2796 | // RA = dst*8, RC = cdata_const (~)
2799 | ldr CARG1, [KBASE, RC, lsl #2]
2800 | mvn CARG2, #~LJ_TCDATA
2802 | strd CARG12, [BASE, RA]
2807 | // RA = dst*8, (RC = int16_literal)
2808 | mov CARG1, INS, asr #16 // Refetch sign-extended reg.
2809 | mvn CARG2, #~LJ_TISNUM
2812 | strd CARG12, [BASE, RA]
2816 | // RA = dst*8, RC = num_const
2819 | ldrd CARG12, [KBASE, RC]
2821 | strd CARG12, [BASE, RA]
2825 | // RA = dst*8, RC = primitive_type (~)
2834 | // RA = base*8, RC = end
2836 | add RC, BASE, RC, lsl #3
2837 | mvn CARG1, #~LJ_TNIL
2838 | str CARG1, [RA, #4]
2841 | str CARG1, [RA, #4]
2848 /* -- Upvalue and function ops ------------------------------------------ */
2851 | // RA = dst*8, RC = uvnum
2852 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
2854 | add RC, RC, #offsetof(GCfuncL, uvptr)
2855 | ldr UPVAL:CARG2, [LFUNC:CARG2, RC]
2856 | ldr CARG2, UPVAL:CARG2->v
2857 | ldrd CARG34, [CARG2]
2860 | strd CARG34, [BASE, RA]
2864 | // RA = uvnum*8, RC = src
2865 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
2867 | add RA, RA, #offsetof(GCfuncL, uvptr)
2869 | ldr UPVAL:CARG2, [LFUNC:CARG2, RA]
2870 | ldrd CARG34, [BASE, RC]
2871 | ldrb RB, UPVAL:CARG2->marked
2872 | ldrb RC, UPVAL:CARG2->closed
2873 | ldr CARG2, UPVAL:CARG2->v
2874 | tst RB, #LJ_GC_BLACK // isblack(uv)
2875 | add RB, CARG4, #-LJ_TISGCV
2877 | strd CARG34, [CARG2]
2878 | bne >2 // Upvalue is closed and black?
2882 |2: // Check if new value is collectable.
2883 | cmn RB, #-(LJ_TISNUM - LJ_TISGCV)
2884 | ldrbhi RC, GCOBJ:CARG3->gch.marked
2885 | bls <1 // tvisgcv(v)
2886 | sub CARG1, DISPATCH, #-GG_DISP2G
2887 | tst RC, #LJ_GC_WHITES
2888 | // Crossed a write barrier. Move the barrier forward.
2889 if (LJ_TARGET_OSX) {
2892 | bl extern lj_gc_barrieruv // (global_State *g, TValue *tv)
2895 | blne extern lj_gc_barrieruv // (global_State *g, TValue *tv)
2900 | // RA = uvnum*8, RC = str_const (~)
2901 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
2903 | add RA, RA, #offsetof(GCfuncL, uvptr)
2905 | ldr UPVAL:CARG2, [LFUNC:CARG2, RA]
2906 | ldr STR:CARG3, [KBASE, RC, lsl #2]
2907 | mvn CARG4, #~LJ_TSTR
2908 | ldrb RB, UPVAL:CARG2->marked
2909 | ldr CARG2, UPVAL:CARG2->v
2910 | ldrb RC, UPVAL:CARG2->closed
2911 | tst RB, #LJ_GC_BLACK // isblack(uv)
2912 | ldrb RB, STR:CARG3->marked
2913 | strd CARG34, [CARG2]
2918 |2: // Check if string is white and ensure upvalue is closed.
2919 | tst RB, #LJ_GC_WHITES // iswhite(str)
2921 | sub CARG1, DISPATCH, #-GG_DISP2G
2922 | // Crossed a write barrier. Move the barrier forward.
2923 if (LJ_TARGET_OSX) {
2926 | bl extern lj_gc_barrieruv // (global_State *g, TValue *tv)
2929 | blne extern lj_gc_barrieruv // (global_State *g, TValue *tv)
2934 | // RA = uvnum*8, RC = num_const
2935 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
2937 | add RA, RA, #offsetof(GCfuncL, uvptr)
2939 | ldr UPVAL:CARG2, [LFUNC:CARG2, RA]
2940 | ldrd CARG34, [KBASE, RC]
2941 | ldr CARG2, UPVAL:CARG2->v
2944 | strd CARG34, [CARG2]
2948 | // RA = uvnum*8, RC = primitive_type (~)
2949 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
2951 | add RA, RA, #offsetof(GCfuncL, uvptr)
2952 | ldr UPVAL:CARG2, [LFUNC:CARG2, RA]
2954 | ldr CARG2, UPVAL:CARG2->v
2957 | str RC, [CARG2, #4]
2962 | // RA = level*8, RC = target
2963 | ldr CARG3, L->openupval
2964 | add RC, PC, RC, lsl #2
2967 | sub PC, RC, #0x20000
2970 | add CARG2, BASE, RA
2971 | bl extern lj_func_closeuv // (lua_State *L, TValue *level)
2978 | // RA = dst*8, RC = proto_const (~) (holding function prototype)
2981 | ldr CARG2, [KBASE, RC, lsl #2]
2983 | ldr CARG3, [BASE, FRAME_FUNC]
2985 | // (lua_State *L, GCproto *pt, GCfuncL *parent)
2986 | bl extern lj_func_newL_gc
2987 | // Returns GCfuncL *.
2989 | mvn CARG2, #~LJ_TFUNC
2992 | strd CARG12, [BASE, RA]
2996 /* -- Table ops --------------------------------------------------------- */
3000 | // RA = dst*8, RC = (hbits|asize) | tab_const (~)
3001 if (op == BC_TDUP) {
3004 | ldr CARG3, [DISPATCH, #DISPATCH_GL(gc.total)]
3005 | ldr CARG4, [DISPATCH, #DISPATCH_GL(gc.threshold)]
3012 if (op == BC_TNEW) {
3013 | lsl CARG2, RC, #21
3014 | lsr CARG3, RC, #11
3015 | asr RC, CARG2, #21
3016 | lsr CARG2, CARG2, #21
3018 | addeq CARG2, CARG2, #2
3019 | bl extern lj_tab_new // (lua_State *L, int32_t asize, uint32_t hbits)
3020 | // Returns GCtab *.
3022 | ldr CARG2, [KBASE, RC, lsl #2]
3023 | bl extern lj_tab_dup // (lua_State *L, Table *kt)
3024 | // Returns GCtab *.
3027 | mvn CARG2, #~LJ_TTAB
3030 | strd CARG12, [BASE, RA]
3033 | bl extern lj_gc_step_fixtop // (lua_State *L)
3039 | // RA = dst*8, RC = str_const (~)
3041 | // RA = dst*8, RC = str_const (~)
3042 | ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
3044 | ldr TAB:CARG1, LFUNC:CARG2->env
3045 | ldr STR:RC, [KBASE, RC, lsl #2]
3046 if (op == BC_GGET) {
3054 | decode_RB8 RB, INS
3055 | decode_RC8 RC, INS
3056 | // RA = dst*8, RB = table*8, RC = key*8
3057 | ldrd TAB:CARG12, [BASE, RB]
3058 | ldrd CARG34, [BASE, RC]
3059 | checktab CARG2, ->vmeta_tgetv // STALL: load CARG12.
3060 | checktp CARG4, LJ_TISNUM // Integer key?
3061 | ldreq CARG4, TAB:CARG1->array
3062 | ldreq CARG2, TAB:CARG1->asize
3065 | add CARG4, CARG4, CARG3, lsl #3
3066 | cmp CARG3, CARG2 // In array part?
3067 | ldrdlo CARG34, [CARG4]
3069 | ins_next1 // Overwrites RB!
3070 | checktp CARG4, LJ_TNIL
3074 | strd CARG34, [BASE, RA]
3077 |5: // Check for __index if table value is nil.
3078 | ldr TAB:CARG2, TAB:CARG1->metatable
3080 | beq <1 // No metatable: done.
3081 | ldrb CARG2, TAB:CARG2->nomm
3082 | tst CARG2, #1<<MM_index
3083 | bne <1 // 'no __index' flag set: done.
3084 | decode_RB8 RB, INS // Restore RB.
3088 | checktp CARG4, LJ_TSTR // String key?
3089 | moveq STR:RC, CARG3
3094 | decode_RB8 RB, INS
3096 | // RA = dst*8, RB = table*8, RC = str_const (~)
3097 | ldrd CARG12, [BASE, RB]
3099 | ldr STR:RC, [KBASE, RC, lsl #2] // STALL: early RC.
3100 | checktab CARG2, ->vmeta_tgets1
3102 | // (TAB:RB =) TAB:CARG1 = GCtab *, STR:RC = GCstr *, RA = dst*8
3103 | ldr CARG3, TAB:CARG1->hmask
3104 | ldr CARG4, STR:RC->hash
3105 | ldr NODE:INS, TAB:CARG1->node
3106 | mov TAB:RB, TAB:CARG1
3107 | and CARG3, CARG3, CARG4 // idx = str->hash & tab->hmask
3108 | add CARG3, CARG3, CARG3, lsl #1
3109 | add NODE:INS, NODE:INS, CARG3, lsl #3 // node = tab->node + idx*3*8
3111 | ldrd CARG12, NODE:INS->key // STALL: early NODE:INS.
3112 | ldrd CARG34, NODE:INS->val
3113 | ldr NODE:INS, NODE:INS->next
3114 | checktp CARG2, LJ_TSTR
3115 | cmpeq CARG1, STR:RC
3117 | checktp CARG4, LJ_TNIL
3122 | strd CARG34, [BASE, RA]
3125 |4: // Follow hash chain.
3128 | // End of hash chain: key not found, nil result.
3130 |5: // Check for __index if table value is nil.
3131 | ldr TAB:CARG1, TAB:RB->metatable
3132 | mov CARG3, #0 // Optional clear of undef. value (during load stall).
3133 | mvn CARG4, #~LJ_TNIL
3135 | beq <3 // No metatable: done.
3136 | ldrb CARG2, TAB:CARG1->nomm
3137 | tst CARG2, #1<<MM_index
3138 | bne <3 // 'no __index' flag set: done.
3142 | decode_RB8 RB, INS
3144 | // RA = dst*8, RB = table*8, RC = index
3145 | ldrd CARG12, [BASE, RB]
3146 | checktab CARG2, ->vmeta_tgetb // STALL: load CARG12.
3147 | ldr CARG3, TAB:CARG1->asize
3148 | ldr CARG4, TAB:CARG1->array
3151 | ldrdlo CARG34, [CARG4, CARG2]
3153 | ins_next1 // Overwrites RB!
3154 | checktp CARG4, LJ_TNIL
3158 | strd CARG34, [BASE, RA]
3161 |5: // Check for __index if table value is nil.
3162 | ldr TAB:CARG2, TAB:CARG1->metatable
3164 | beq <1 // No metatable: done.
3165 | ldrb CARG2, TAB:CARG2->nomm
3166 | tst CARG2, #1<<MM_index
3167 | bne <1 // 'no __index' flag set: done.
3172 | decode_RB8 RB, INS
3173 | decode_RC8 RC, INS
3174 | // RA = src*8, RB = table*8, RC = key*8
3175 | ldrd TAB:CARG12, [BASE, RB]
3176 | ldrd CARG34, [BASE, RC]
3177 | checktab CARG2, ->vmeta_tsetv // STALL: load CARG12.
3178 | checktp CARG4, LJ_TISNUM // Integer key?
3179 | ldreq CARG2, TAB:CARG1->array
3180 | ldreq CARG4, TAB:CARG1->asize
3183 | add CARG2, CARG2, CARG3, lsl #3
3184 | cmp CARG3, CARG4 // In array part?
3185 | ldrlo INS, [CARG2, #4]
3187 | ins_next1 // Overwrites RB!
3188 | checktp INS, LJ_TNIL
3189 | ldrb INS, TAB:CARG1->marked
3190 | ldrd CARG34, [BASE, RA]
3193 | tst INS, #LJ_GC_BLACK // isblack(table)
3194 | strd CARG34, [CARG2]
3200 |5: // Check for __newindex if previous value is nil.
3201 | ldr TAB:RA, TAB:CARG1->metatable
3203 | beq <1 // No metatable: done.
3204 | ldrb RA, TAB:RA->nomm
3205 | tst RA, #1<<MM_newindex
3206 | bne <1 // 'no __newindex' flag set: done.
3207 | ldr INS, [PC, #-4] // Restore RA and RB.
3208 | decode_RB8 RB, INS
3209 | decode_RA8 RA, INS
3212 |7: // Possible table write barrier for the value. Skip valiswhite check.
3213 | barrierback TAB:CARG1, INS, CARG3
3217 | checktp CARG4, LJ_TSTR // String key?
3218 | moveq STR:RC, CARG3
3223 | decode_RB8 RB, INS
3225 | // RA = src*8, RB = table*8, RC = str_const (~)
3226 | ldrd CARG12, [BASE, RB]
3228 | ldr STR:RC, [KBASE, RC, lsl #2] // STALL: early RC.
3229 | checktab CARG2, ->vmeta_tsets1
3231 | // (TAB:RB =) TAB:CARG1 = GCtab *, STR:RC = GCstr *, RA = dst*8
3232 | ldr CARG3, TAB:CARG1->hmask
3233 | ldr CARG4, STR:RC->hash
3234 | ldr NODE:INS, TAB:CARG1->node
3235 | mov TAB:RB, TAB:CARG1
3236 | and CARG3, CARG3, CARG4 // idx = str->hash & tab->hmask
3237 | add CARG3, CARG3, CARG3, lsl #1
3239 | add NODE:INS, NODE:INS, CARG3, lsl #3 // node = tab->node + idx*3*8
3240 | strb CARG4, TAB:RB->nomm // Clear metamethod cache.
3242 | ldrd CARG12, NODE:INS->key
3243 | ldr CARG4, NODE:INS->val.it
3244 | ldr NODE:CARG3, NODE:INS->next
3245 | checktp CARG2, LJ_TSTR
3246 | cmpeq CARG1, STR:RC
3248 | ldrb CARG2, TAB:RB->marked
3249 | checktp CARG4, LJ_TNIL // Key found, but nil value?
3250 | ldrd CARG34, [BASE, RA]
3253 | tst CARG2, #LJ_GC_BLACK // isblack(table)
3254 | strd CARG34, NODE:INS->val
3259 |4: // Check for __newindex if previous value is nil.
3260 | ldr TAB:CARG1, TAB:RB->metatable
3262 | beq <2 // No metatable: done.
3263 | ldrb CARG1, TAB:CARG1->nomm
3264 | tst CARG1, #1<<MM_newindex
3265 | bne <2 // 'no __newindex' flag set: done.
3268 |5: // Follow hash chain.
3269 | movs NODE:INS, NODE:CARG3
3271 | // End of hash chain: key not found, add a new one.
3273 | // But check for __newindex first.
3274 | ldr TAB:CARG1, TAB:RB->metatable
3277 | cmp TAB:CARG1, #0 // No metatable: continue.
3279 | ldrbne CARG2, TAB:CARG1->nomm
3282 | tst CARG2, #1<<MM_newindex
3283 | beq ->vmeta_tsets // 'no __newindex' flag NOT set: check.
3285 | mvn CARG4, #~LJ_TSTR
3286 | str STR:RC, TMPDlo
3289 | bl extern lj_tab_newkey // (lua_State *L, GCtab *t, TValue *k)
3290 | // Returns TValue *.
3292 | ldrd CARG34, [BASE, RA]
3293 | strd CARG34, [CRET1]
3294 | b <3 // No 2nd write barrier needed.
3296 |7: // Possible table write barrier for the value. Skip valiswhite check.
3297 | barrierback TAB:RB, CARG2, CARG3
3301 | decode_RB8 RB, INS
3303 | // RA = src*8, RB = table*8, RC = index
3304 | ldrd CARG12, [BASE, RB]
3305 | checktab CARG2, ->vmeta_tsetb // STALL: load CARG12.
3306 | ldr CARG3, TAB:CARG1->asize
3307 | ldr RB, TAB:CARG1->array
3310 | ldrdlo CARG34, [CARG2, RB]!
3312 | ins_next1 // Overwrites RB!
3313 | checktp CARG4, LJ_TNIL
3314 | ldrb INS, TAB:CARG1->marked
3315 | ldrd CARG34, [BASE, RA]
3318 | tst INS, #LJ_GC_BLACK // isblack(table)
3319 | strd CARG34, [CARG2]
3325 |5: // Check for __newindex if previous value is nil.
3326 | ldr TAB:RA, TAB:CARG1->metatable
3328 | beq <1 // No metatable: done.
3329 | ldrb RA, TAB:RA->nomm
3330 | tst RA, #1<<MM_newindex
3331 | bne <1 // 'no __newindex' flag set: done.
3332 | ldr INS, [PC, #-4] // Restore INS.
3333 | decode_RA8 RA, INS
3336 |7: // Possible table write barrier for the value. Skip valiswhite check.
3337 | barrierback TAB:CARG1, INS, CARG3
3342 | // RA = base*8 (table at base-1), RC = num_const (start index)
3345 | ldr RB, SAVE_MULTRES
3346 | ldr TAB:CARG2, [RA, #-8] // Guaranteed to be a table.
3347 | ldr CARG1, [KBASE, RC, lsl #3] // Integer constant is in lo-word.
3349 | ldr CARG4, TAB:CARG2->asize
3350 | beq >4 // Nothing to copy?
3351 | add CARG3, CARG1, RB, lsr #3
3353 | ldr CARG4, TAB:CARG2->array
3356 | add INS, CARG4, CARG1, lsl #3
3357 | ldrb CARG1, TAB:CARG2->marked
3358 |3: // Copy result slots to table.
3359 | ldrd CARG34, [RA], #8
3360 | strd CARG34, [INS], #8
3363 | tst CARG1, #LJ_GC_BLACK // isblack(table)
3368 |5: // Need to resize array part.
3372 | bl extern lj_tab_reasize // (lua_State *L, GCtab *t, int nasize)
3373 | // Must not reallocate the stack.
3374 | IOS ldr BASE, L->base
3377 |7: // Possible table write barrier for any value. Skip valiswhite check.
3378 | barrierback TAB:CARG2, CARG1, CARG3
3382 /* -- Calls and vararg handling ----------------------------------------- */
3385 | // RA = base*8, (RB = nresults+1,) RC = extra_nargs
3386 | ldr CARG1, SAVE_MULTRES
3387 | decode_RC8 NARGS8:RC, INS
3388 | add NARGS8:RC, NARGS8:RC, CARG1
3392 | decode_RC8 NARGS8:RC, INS
3393 | // RA = base*8, (RB = nresults+1,) RC = (nargs+1)*8
3395 | mov RB, BASE // Save old BASE for vmeta_call.
3396 | ldrd CARG34, [BASE, RA]!
3397 | sub NARGS8:RC, NARGS8:RC, #8
3398 | add BASE, BASE, #8
3399 | checkfunc CARG4, ->vmeta_call
3404 | // RA = base*8, (RB = 0,) RC = extra_nargs
3405 | ldr CARG1, SAVE_MULTRES
3406 | add NARGS8:RC, CARG1, RC, lsl #3
3410 | lsl NARGS8:RC, RC, #3
3411 | // RA = base*8, (RB = 0,) RC = (nargs+1)*8
3413 | ldrd LFUNC:CARG34, [RA, BASE]!
3414 | sub NARGS8:RC, NARGS8:RC, #8
3416 | checkfunc CARG4, ->vmeta_callt
3417 | ldr PC, [BASE, FRAME_PC]
3420 | ldrb CARG4, LFUNC:CARG3->ffid
3421 | tst PC, #FRAME_TYPE
3424 | str LFUNC:CARG3, [BASE, FRAME_FUNC] // Copy function down, but keep PC.
3428 | ldrd CARG12, [RA, RB]
3430 | cmp INS, NARGS8:RC
3431 | strd CARG12, [BASE, RB]
3435 | cmp CARG4, #1 // (> FF_C) Calling a fast function?
3440 |5: // Tailcall to a fast function with a Lua frame below.
3441 | ldr INS, [PC, #-4]
3442 | decode_RA8 RA, INS
3443 | sub CARG1, BASE, RA
3444 | ldr LFUNC:CARG1, [CARG1, #-16]
3445 | ldr CARG1, LFUNC:CARG1->field_pc
3446 | ldr KBASE, [CARG1, #PC2PROTO(k)]
3449 |7: // Tailcall from a vararg function.
3450 | eor PC, PC, #FRAME_VARG
3451 | tst PC, #FRAME_TYPEP // Vararg frame below?
3452 | movne CARG4, #0 // Clear ffid if no Lua function below.
3454 | sub BASE, BASE, PC
3455 | ldr PC, [BASE, FRAME_PC]
3456 | tst PC, #FRAME_TYPE
3457 | movne CARG4, #0 // Clear ffid if no Lua function below.
3462 | // RA = base*8, (RB = nresults+1, RC = nargs+1 (2+1))
3464 | mov RB, BASE // Save old BASE for vmeta_call.
3465 | ldrd CARG34, [RA, #-16]
3466 | ldrd CARG12, [RA, #-8]
3468 | strd CARG34, [RA, #8] // Copy state.
3469 | strd CARG12, [RA, #16] // Copy control var.
3470 | // STALL: locked CARG34.
3471 | ldrd LFUNC:CARG34, [RA, #-24]
3472 | mov NARGS8:RC, #16 // Iterators get 2 arguments.
3473 | // STALL: load CARG34.
3474 | strd LFUNC:CARG34, [RA] // Copy callable.
3475 | checkfunc CARG4, ->vmeta_call
3480 | // RA = base*8, (RB = nresults+1, RC = nargs+1 (2+1))
3482 | // NYI: add hotloop, record BC_ITERN.
3485 | ldr TAB:RB, [RA, #-16]
3486 | ldr CARG1, [RA, #-8] // Get index from control var.
3487 | ldr INS, TAB:RB->asize
3488 | ldr CARG2, TAB:RB->array
3490 |1: // Traverse array part.
3491 | subs RC, CARG1, INS
3492 | add CARG3, CARG2, CARG1, lsl #3
3493 | bhs >5 // Index points after array part?
3494 | ldrd CARG34, [CARG3]
3495 | checktp CARG4, LJ_TNIL
3496 | addeq CARG1, CARG1, #1 // Skip holes in array part.
3498 | ldrh RC, [PC, #-2]
3499 | mvn CARG2, #~LJ_TISNUM
3500 | strd CARG34, [RA, #8]
3501 | add RC, PC, RC, lsl #2
3504 | sub PC, RC, #0x20000
3505 | str RB, [RA, #-8] // Update control var.
3509 |5: // Traverse hash part.
3510 | ldr CARG4, TAB:RB->hmask
3511 | ldr NODE:RB, TAB:RB->node
3513 | add CARG1, RC, RC, lsl #1
3514 | cmp RC, CARG4 // End of iteration? Branch to ITERL+1.
3515 | add NODE:CARG3, NODE:RB, CARG1, lsl #3 // node = tab->node + idx*3*8
3517 | ldrd CARG12, NODE:CARG3->val
3518 | checktp CARG2, LJ_TNIL
3520 | beq <6 // Skip holes in hash part.
3521 | ldrh RB, [PC, #-2]
3523 | ldrd CARG34, NODE:CARG3->key
3524 | str RC, [RA, #-8] // Update control var.
3525 | strd CARG12, [RA, #8]
3526 | add RC, PC, RB, lsl #2
3527 | sub PC, RC, #0x20000
3533 | // RA = base*8, RC = target (points to ITERN)
3535 | add RC, PC, RC, lsl #2
3536 | ldrd CFUNC:CARG12, [RA, #-24]
3537 | ldr CARG3, [RA, #-12]
3538 | ldr CARG4, [RA, #-4]
3539 | checktp CARG2, LJ_TFUNC
3540 | ldrbeq CARG1, CFUNC:CARG1->ffid
3541 | checktpeq CARG3, LJ_TTAB
3542 | checktpeq CARG4, LJ_TNIL
3543 | cmpeq CARG1, #FF_next_N
3544 | subeq PC, RC, #0x20000
3549 | str CARG1, [RA, #-8] // Initialize control var.
3552 |5: // Despecialize bytecode if any of the checks fail.
3553 | mov CARG1, #BC_JMP
3555 | strb CARG1, [PC, #-4]
3556 | sub PC, RC, #0x20000
3557 | strb OP, [PC] // Subsumes ins_next1.
3563 | decode_RB8 RB, INS
3564 | decode_RC8 RC, INS
3565 | // RA = base*8, RB = (nresults+1)*8, RC = numparams*8
3566 | ldr CARG1, [BASE, FRAME_PC]
3569 | add RC, RC, #FRAME_VARG
3571 | sub CARG3, BASE, #8 // CARG3 = vtop
3572 | sub RC, RC, CARG1 // RC = vbase
3573 | // Note: RC may now be even _above_ BASE if nargs was < numparams.
3575 | sub CARG1, CARG3, RC
3576 | beq >5 // Copy all varargs?
3577 | sub CARG4, CARG4, #16
3578 |1: // Copy vararg slots to destination slots.
3580 | ldrdlo CARG12, [RC], #8
3581 | mvnhs CARG2, #~LJ_TNIL
3583 | strd CARG12, [RA], #8
3588 |5: // Copy all varargs.
3589 | ldr CARG4, L->maxstack
3591 | movle RB, #8 // MULTRES = (0+1)*8
3592 | addgt RB, CARG1, #8
3593 | add CARG2, RA, CARG1
3594 | str RB, SAVE_MULTRES
3599 | ldrd CARG12, [RC], #8
3600 | strd CARG12, [RA], #8
3605 |7: // Grow stack for varargs.
3606 | lsr CARG2, CARG1, #3
3610 | sub RC, RC, BASE // Need delta, because BASE may change.
3613 | bl extern lj_state_growstack // (lua_State *L, int n)
3617 | sub CARG3, BASE, #8
3621 /* -- Returns ----------------------------------------------------------- */
3624 | // RA = results*8, RC = extra results
3625 | ldr CARG1, SAVE_MULTRES
3626 | ldr PC, [BASE, FRAME_PC]
3628 | add RC, CARG1, RC, lsl #3
3633 | // RA = results*8, RC = nresults+1
3634 | ldr PC, [BASE, FRAME_PC]
3638 | str RC, SAVE_MULTRES
3640 | ands CARG1, PC, #FRAME_TYPE
3641 | eor CARG2, PC, #FRAME_VARG
3645 | // BASE = base, RA = resultptr, RC = (nresults+1)*8, PC = return
3646 | ldr INS, [PC, #-4]
3647 | subs CARG4, RC, #8
3648 | sub CARG3, BASE, #8
3651 | ldrd CARG12, [RA], #8
3652 | add BASE, BASE, #8
3653 | subs CARG4, CARG4, #8
3654 | strd CARG12, [BASE, #-16]
3657 | decode_RA8 RA, INS
3658 | sub CARG4, CARG3, RA
3659 | decode_RB8 RB, INS
3660 | ldr LFUNC:CARG1, [CARG4, FRAME_FUNC]
3662 | cmp RB, RC // More results expected?
3665 | ldr CARG2, LFUNC:CARG1->field_pc
3668 | ldr KBASE, [CARG2, #PC2PROTO(k)]
3671 |6: // Fill up results with nil.
3672 | mvn CARG2, #~LJ_TNIL
3673 | add BASE, BASE, #8
3675 | str CARG2, [BASE, #-12]
3678 |->BC_RETV1_Z: // Non-standard return case.
3681 | tst CARG2, #FRAME_TYPEP
3683 | // Return from vararg function: relocate BASE down.
3684 | sub BASE, BASE, CARG2
3685 | ldr PC, [BASE, FRAME_PC]
3689 case BC_RET0: case BC_RET1:
3690 | // RA = results*8, RC = nresults+1
3691 | ldr PC, [BASE, FRAME_PC]
3693 | str RC, SAVE_MULTRES
3694 | ands CARG1, PC, #FRAME_TYPE
3695 | eor CARG2, PC, #FRAME_VARG
3696 | ldreq INS, [PC, #-4]
3698 if (op == BC_RET1) {
3699 | ldrd CARG12, [BASE, RA]
3701 | sub CARG4, BASE, #8
3702 | decode_RA8 RA, INS
3703 if (op == BC_RET1) {
3704 | strd CARG12, [CARG4]
3706 | sub BASE, CARG4, RA
3707 | decode_RB8 RB, INS
3708 | ldr LFUNC:CARG1, [BASE, FRAME_FUNC]
3712 | ldr CARG2, LFUNC:CARG1->field_pc
3715 | ldr KBASE, [CARG2, #PC2PROTO(k)]
3718 |6: // Fill up results with nil.
3719 | sub CARG2, CARG4, #4
3720 | mvn CARG3, #~LJ_TNIL
3721 | str CARG3, [CARG2, RC]
3726 /* -- Loops and branches ------------------------------------------------ */
3728 |.define FOR_IDX, [RA]; .define FOR_TIDX, [RA, #4]
3729 |.define FOR_STOP, [RA, #8]; .define FOR_TSTOP, [RA, #12]
3730 |.define FOR_STEP, [RA, #16]; .define FOR_TSTEP, [RA, #20]
3731 |.define FOR_EXT, [RA, #24]; .define FOR_TEXT, [RA, #28]
3737 | // Fall through. Assumes BC_IFORL follows.
3747 | // RA = base*8, RC = target (after end of loop or start of loop)
3748 vk = (op == BC_IFORL || op == BC_JFORL);
3749 | ldrd CARG12, [RA, BASE]!
3750 if (op != BC_JFORL) {
3751 | add RC, PC, RC, lsl #2
3754 | ldrd CARG34, FOR_STOP
3755 | checktp CARG2, LJ_TISNUM
3758 | checktp CARG4, LJ_TISNUM
3759 | ldr CARG4, FOR_STEP
3760 | checktpeq RB, LJ_TISNUM
3766 | ldrd CARG34, FOR_STEP
3767 | checktp CARG2, LJ_TISNUM
3769 | adds CARG1, CARG1, CARG3
3770 | ldr CARG4, FOR_STOP
3771 if (op == BC_IFORL) {
3772 | addvs RC, PC, #0x20000 // Overflow: prevent branch.
3774 | bvs >2 // Overflow: do not enter mcode.
3781 if (op == BC_FORI) {
3782 | subgt PC, RC, #0x20000
3783 } else if (op == BC_JFORI) {
3784 | sub PC, RC, #0x20000
3785 | ldrhle RC, [PC, #-2]
3786 } else if (op == BC_IFORL) {
3787 | suble PC, RC, #0x20000
3790 | strd CARG12, FOR_IDX
3795 | strd CARG12, FOR_EXT
3796 if (op == BC_JFORI || op == BC_JFORL) {
3802 |4: // Invert check for negative step.
3812 | cmnlo CARG4, #-LJ_TISNUM
3813 | cmnlo RB, #-LJ_TISNUM
3816 | strd CARG12, FOR_IDX
3817 | strd CARG12, FOR_EXT
3822 | bl extern __aeabi_dadd
3823 | strd CARG12, FOR_IDX
3824 | ldrd CARG34, FOR_STOP
3825 | strd CARG12, FOR_EXT
3828 | bl extern __aeabi_cdcmple
3829 if (op == BC_FORI) {
3830 | subhi PC, RC, #0x20000
3831 } else if (op == BC_JFORI) {
3832 | sub PC, RC, #0x20000
3833 | ldrhls RC, [PC, #-2]
3835 } else if (op == BC_IFORL) {
3836 | subls PC, RC, #0x20000
3844 |8: // Invert check for negative step.
3846 | bl extern __aeabi_dadd
3847 | strd CARG12, FOR_IDX
3848 | strd CARG12, FOR_EXT
3852 | ldrd CARG12, FOR_STOP
3860 | // Fall through. Assumes BC_IITERL follows.
3868 | // RA = base*8, RC = target
3869 | ldrd CARG12, [RA, BASE]!
3870 if (op == BC_JITERL) {
3871 | cmn CARG2, #-LJ_TNIL // Stop if iterator returned nil.
3872 | strdne CARG12, [RA, #-8]
3875 | add RC, PC, RC, lsl #2
3876 | // STALL: load CARG12.
3877 | cmn CARG2, #-LJ_TNIL // Stop if iterator returned nil.
3878 | subne PC, RC, #0x20000 // Otherwise save control var + branch.
3879 | strdne CARG12, [RA, #-8]
3885 | // RA = base*8, RC = target (loop extent)
3886 | // Note: RA/RC is only used by trace recorder to determine scope/extent
3887 | // This opcode does NOT jump, it's only purpose is to detect a hot loop.
3891 | // Fall through. Assumes BC_ILOOP follows.
3895 | // RA = base*8, RC = target (loop extent)
3901 | // RA = base (ignored), RC = traceno
3902 | ldr CARG1, [DISPATCH, #DISPATCH_J(trace)]
3903 | mov CARG2, #0 // Traces on ARM don't store the trace number, so use 0.
3904 | ldr TRACE:RC, [CARG1, RC, lsl #2]
3906 | ldr RA, TRACE:RC->mcode
3907 | str BASE, [DISPATCH, #DISPATCH_GL(jit_base)]
3908 | str L, [DISPATCH, #DISPATCH_GL(jit_L)]
3914 | // RA = base*8 (only used by trace recorder), RC = target
3915 | add RC, PC, RC, lsl #2
3916 | sub PC, RC, #0x20000
3920 /* -- Function headers -------------------------------------------------- */
3926 case BC_FUNCV: /* NYI: compiled vararg functions. */
3927 | // Fall through. Assumes BC_IFUNCF/BC_IFUNCV follow.
3935 | // BASE = new base, RA = BASE+framesize*8, CARG3 = LFUNC, RC = nargs*8
3936 | ldr CARG1, L->maxstack
3937 | ldrb CARG2, [PC, #-4+PC2PROTO(numparams)]
3938 | ldr KBASE, [PC, #-4+PC2PROTO(k)]
3940 | bhi ->vm_growstack_l
3941 if (op != BC_JFUNCF) {
3946 | cmp NARGS8:RC, CARG2, lsl #3 // Check for missing parameters.
3947 | mvn CARG4, #~LJ_TNIL
3949 if (op == BC_JFUNCF) {
3956 |3: // Clear missing parameters.
3957 | strd CARG34, [BASE, NARGS8:RC]
3958 | add NARGS8:RC, NARGS8:RC, #8
3966 | NYI // NYI: compiled vararg functions
3967 break; /* NYI: compiled vararg functions. */
3970 | // BASE = new base, RA = BASE+framesize*8, CARG3 = LFUNC, RC = nargs*8
3971 | ldr CARG1, L->maxstack
3972 | add CARG4, BASE, RC
3974 | str LFUNC:CARG3, [CARG4] // Store copy of LFUNC.
3975 | add CARG2, RC, #8+FRAME_VARG
3976 | ldr KBASE, [PC, #-4+PC2PROTO(k)]
3978 | str CARG2, [CARG4, #4] // Store delta + FRAME_VARG.
3979 | bhs ->vm_growstack_l
3980 | ldrb RB, [PC, #-4+PC2PROTO(numparams)]
3984 | add BASE, CARG4, #8
3986 | mvn CARG3, #~LJ_TNIL
3988 | cmp RA, RC // Less args than parameters?
3989 | ldrdlo CARG12, [RA], #8
3990 | movhs CARG2, CARG3
3991 | strlo CARG3, [RA, #-4] // Clear old fixarg slot (help the GC).
3994 | strd CARG12, [CARG4, #8]!
4002 | // BASE = new base, RA = BASE+framesize*8, CARG3 = CFUNC, RC = nargs*8
4003 if (op == BC_FUNCC) {
4004 | ldr CARG4, CFUNC:CARG3->f
4006 | ldr CARG4, [DISPATCH, #DISPATCH_GL(wrapf)]
4008 | add CARG2, RA, NARGS8:RC
4009 | ldr CARG1, L->maxstack
4010 | add RC, BASE, NARGS8:RC
4014 if (op == BC_FUNCCW) {
4015 | ldr CARG2, CFUNC:CARG3->f
4017 | mv_vmstate CARG3, C
4019 | bhi ->vm_growstack_c // Need to grow stack.
4021 | blx CARG4 // (lua_State *L [, lua_CFunction f])
4022 | // Returns nresults.
4024 | mv_vmstate CARG3, INTERP
4028 | ldr PC, [BASE, FRAME_PC]
4029 | sub RA, CRET2, RC // RA = L->top - nresults*8
4033 /* ---------------------------------------------------------------------- */
4036 fprintf(stderr, "Error: undefined opcode BC_%s\n", bc_names[op]);
4042 static int build_backend(BuildCtx *ctx)
4046 dasm_growpc(Dst, BC__MAX);
4048 build_subroutines(ctx);
4051 for (op = 0; op < BC__MAX; op++)
4052 build_ins(ctx, (BCOp)op, op);
4057 /* Emit pseudo frame-info for all assembler functions. */
4058 static void emit_asm_debug(BuildCtx *ctx)
4060 int fcofs = (int)((uint8_t *)ctx->glob[GLOB_vm_ffi_call] - ctx->code);
4062 switch (ctx->mode) {
4064 fprintf(ctx->fp, "\t.section .debug_frame,\"\",%%progbits\n");
4067 "\t.long .LECIE0-.LSCIE0\n"
4069 "\t.long 0xffffffff\n"
4074 "\t.byte 0xe\n" /* Return address is in lr. */
4075 "\t.byte 0xc\n\t.uleb128 0xd\n\t.uleb128 0\n" /* def_cfa sp */
4080 "\t.long .LEFDE0-.LASFDE0\n"
4082 "\t.long .Lframe0\n"
4085 "\t.byte 0xe\n\t.uleb128 %d\n" /* def_cfa_offset */
4086 "\t.byte 0x8e\n\t.uleb128 1\n", /* offset lr */
4087 fcofs, CFRAME_SIZE);
4088 for (i = 11; i >= 4; i--) /* offset r4-r11 */
4089 fprintf(ctx->fp, "\t.byte %d\n\t.uleb128 %d\n", 0x80+i, 2+(11-i));
4096 "\t.long .LEFDE1-.LASFDE1\n"
4098 "\t.long .Lframe0\n"
4099 "\t.long lj_vm_ffi_call\n"
4101 "\t.byte 0xe\n\t.uleb128 16\n" /* def_cfa_offset */
4102 "\t.byte 0x8e\n\t.uleb128 1\n" /* offset lr */
4103 "\t.byte 0x8b\n\t.uleb128 2\n" /* offset r11 */
4104 "\t.byte 0x85\n\t.uleb128 3\n" /* offset r5 */
4105 "\t.byte 0x84\n\t.uleb128 4\n" /* offset r4 */
4106 "\t.byte 0xd\n\t.uleb128 0xb\n" /* def_cfa_register r11 */
4108 ".LEFDE1:\n\n", (int)ctx->codesz - fcofs);