1 |// Low-level VM code for MIPS CPUs.
2 |// Bytecode interpreter, fast functions and helper functions.
3 |// Copyright (C) 2005-2015 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.
19 |// Don't use: r0 = 0, r26/r27 = reserved, r28 = gp, r29 = sp, r31 = ra
21 |// The following must be C callee-save (but BASE is often refetched).
22 |.define BASE, r16 // Base of current Lua stack frame.
23 |.define KBASE, r17 // Constants of current Lua function.
24 |.define PC, r18 // Next PC.
25 |.define DISPATCH, r19 // Opcode dispatch table.
26 |.define LREG, r20 // Register holding lua_State (also in SAVE_L).
27 |.define MULTRES, r21 // Size of multi-result: (nresults+1)*8.
28 |// NYI: r22 currently unused.
30 |.define JGL, r30 // On-trace: global_State + 32768.
32 |// Constants for type-comparisons, stores and conversions. C callee-save.
34 |.define TOBIT, f30 // 2^52 + 2^51.
36 |// The following temporaries are not saved across C calls, except for RA.
37 |.define RA, r23 // Callee-save.
43 |.define AT, r1 // Assembler temporary.
49 |// Calling conventions.
50 |.define CFUNCADDR, r25
65 |// Stack layout while in interpreter. Must match with lj_frame.h.
66 |.define CFRAME_SPACE, 112 // Delta for sp.
68 |.define SAVE_ERRF, 124(sp) // 32 bit C frame info.
69 |.define SAVE_NRES, 120(sp)
70 |.define SAVE_CFRAME, 116(sp)
71 |.define SAVE_L, 112(sp)
72 |//----- 8 byte aligned, ^^^^ 16 byte register save area, owned by interpreter.
73 |.define SAVE_GPR_, 72 // .. 72+10*4: 32 bit GPR saves.
74 |.define SAVE_FPR_, 24 // .. 24+6*8: 64 bit FPR saves.
75 |.define SAVE_PC, 20(sp)
77 |.define CSAVE_4, 12(sp)
78 |.define CSAVE_3, 8(sp)
79 |.define CSAVE_2, 4(sp)
80 |.define CSAVE_1, 0(sp)
81 |//----- 8 byte aligned, ^^^^ 16 byte register save area, owned by callee.
84 |.define SAVE_MULTRES, ARG5
87 | addiu sp, sp, -CFRAME_SPACE
88 | sw ra, SAVE_GPR_+9*4(sp)
89 | sw r30, SAVE_GPR_+8*4(sp)
90 | sdc1 f30, SAVE_FPR_+5*8(sp)
91 | sw r23, SAVE_GPR_+7*4(sp)
92 | sw r22, SAVE_GPR_+6*4(sp)
93 | sdc1 f28, SAVE_FPR_+4*8(sp)
94 | sw r21, SAVE_GPR_+5*4(sp)
95 | sw r20, SAVE_GPR_+4*4(sp)
96 | sdc1 f26, SAVE_FPR_+3*8(sp)
97 | sw r19, SAVE_GPR_+3*4(sp)
98 | sw r18, SAVE_GPR_+2*4(sp)
99 | sdc1 f24, SAVE_FPR_+2*8(sp)
100 | sw r17, SAVE_GPR_+1*4(sp)
101 | sw r16, SAVE_GPR_+0*4(sp)
102 | sdc1 f22, SAVE_FPR_+1*8(sp)
103 | sdc1 f20, SAVE_FPR_+0*8(sp)
106 |.macro restoreregs_ret
107 | lw ra, SAVE_GPR_+9*4(sp)
108 | lw r30, SAVE_GPR_+8*4(sp)
109 | ldc1 f30, SAVE_FPR_+5*8(sp)
110 | lw r23, SAVE_GPR_+7*4(sp)
111 | lw r22, SAVE_GPR_+6*4(sp)
112 | ldc1 f28, SAVE_FPR_+4*8(sp)
113 | lw r21, SAVE_GPR_+5*4(sp)
114 | lw r20, SAVE_GPR_+4*4(sp)
115 | ldc1 f26, SAVE_FPR_+3*8(sp)
116 | lw r19, SAVE_GPR_+3*4(sp)
117 | lw r18, SAVE_GPR_+2*4(sp)
118 | ldc1 f24, SAVE_FPR_+2*8(sp)
119 | lw r17, SAVE_GPR_+1*4(sp)
120 | lw r16, SAVE_GPR_+0*4(sp)
121 | ldc1 f22, SAVE_FPR_+1*8(sp)
122 | ldc1 f20, SAVE_FPR_+0*8(sp)
124 | addiu sp, sp, CFRAME_SPACE
127 |// Type definitions. Some of these are only used for documentation.
128 |.type L, lua_State, LREG
129 |.type GL, global_State
130 |.type TVALUE, TValue
134 |.type LFUNC, GCfuncL
135 |.type CFUNC, GCfuncC
136 |.type PROTO, GCproto
137 |.type UPVAL, GCupval
140 |.type TRACE, GCtrace
143 |//-----------------------------------------------------------------------
145 |// Trap for not-yet-implemented parts.
146 |.macro NYI; .long 0xf0f0f0f0; .endmacro
148 |// Macros to mark delay slots.
149 |.macro ., a; a; .endmacro
150 |.macro ., a,b; a,b; .endmacro
151 |.macro ., a,b,c; a,b,c; .endmacro
153 |//-----------------------------------------------------------------------
155 |// Endian-specific defines.
156 |.define FRAME_PC, LJ_ENDIAN_SELECT(-4,-8)
157 |.define FRAME_FUNC, LJ_ENDIAN_SELECT(-8,-4)
158 |.define HI, LJ_ENDIAN_SELECT(4,0)
159 |.define LO, LJ_ENDIAN_SELECT(0,4)
160 |.define OFS_RD, LJ_ENDIAN_SELECT(2,0)
161 |.define OFS_RA, LJ_ENDIAN_SELECT(1,2)
162 |.define OFS_OP, LJ_ENDIAN_SELECT(0,3)
164 |// Instruction decode.
165 |.macro decode_OP1, dst, ins; andi dst, ins, 0xff; .endmacro
166 |.macro decode_OP4a, dst, ins; andi dst, ins, 0xff; .endmacro
167 |.macro decode_OP4b, dst; sll dst, dst, 2; .endmacro
168 |.macro decode_RC4a, dst, ins; srl dst, ins, 14; .endmacro
169 |.macro decode_RC4b, dst; andi dst, dst, 0x3fc; .endmacro
170 |.macro decode_RD4b, dst; sll dst, dst, 2; .endmacro
171 |.macro decode_RA8a, dst, ins; srl dst, ins, 5; .endmacro
172 |.macro decode_RA8b, dst; andi dst, dst, 0x7f8; .endmacro
173 |.macro decode_RB8a, dst, ins; srl dst, ins, 21; .endmacro
174 |.macro decode_RB8b, dst; andi dst, dst, 0x7f8; .endmacro
175 |.macro decode_RD8a, dst, ins; srl dst, ins, 16; .endmacro
176 |.macro decode_RD8b, dst; sll dst, dst, 3; .endmacro
177 |.macro decode_RDtoRC8, dst, src; andi dst, src, 0x7f8; .endmacro
179 |// Instruction fetch.
184 |// Instruction decode+dispatch.
186 | decode_OP4a TMP1, INS
188 | addu TMP0, DISPATCH, TMP1
189 | decode_RD8a RD, INS
191 | decode_RA8a RA, INS
201 |// Instruction footer.
203 | // Replicated dispatch. Less unpredictable branches, but higher I-Cache use.
204 | .define ins_next, ins_NEXT
205 | .define ins_next_, ins_NEXT
206 | .define ins_next1, ins_NEXT1
207 | .define ins_next2, ins_NEXT2
209 | // Common dispatch. Lower I-Cache use, only one (very) unpredictable branch.
210 | // Affects only certain kinds of benchmarks (and only with -j off).
225 |// Call decode and dispatch.
227 | // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
228 | lw PC, LFUNC:RB->pc
231 | decode_OP4a TMP1, INS
232 | decode_RA8a RA, INS
235 | addu TMP0, DISPATCH, TMP1
242 | // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, PC = caller PC
243 | sw PC, FRAME_PC(BASE)
247 |//-----------------------------------------------------------------------
251 | lui AT, (-(BCBIAS_J*4 >> 16) & 65535)
252 | addu TMP0, TMP0, AT
256 |// Assumes DISPATCH is relative to GL.
257 #define DISPATCH_GL(field) (GG_DISP2G + (int)offsetof(global_State, field))
258 #define DISPATCH_J(field) (GG_DISP2J + (int)offsetof(jit_State, field))
259 #define GG_DISP2GOT (GG_OFS(got) - GG_OFS(dispatch))
260 #define DISPATCH_GOT(name) (GG_DISP2GOT + 4*LJ_GOT_##name)
262 #define PC2PROTO(field) ((int)offsetof(GCproto, field)-(int)sizeof(GCproto))
264 |.macro load_got, func
265 | lw CFUNCADDR, DISPATCH_GOT(func)(DISPATCH)
267 |// Much faster. Sadly, there's no easy way to force the required code layout.
268 |// .macro call_intern, func; bal extern func; .endmacro
269 |.macro call_intern, func; jalr CFUNCADDR; .endmacro
270 |.macro call_extern; jalr CFUNCADDR; .endmacro
271 |.macro jmp_extern; jr CFUNCADDR; .endmacro
273 |.macro hotcheck, delta, target
275 | andi TMP1, TMP1, 126
276 | addu TMP1, TMP1, DISPATCH
277 | lhu TMP2, GG_DISP2HOT(TMP1)
278 | addiu TMP2, TMP2, -delta
280 |. sh TMP2, GG_DISP2HOT(TMP1)
284 | hotcheck HOTCOUNT_LOOP, ->vm_hotloop
288 | hotcheck HOTCOUNT_CALL, ->vm_hotcall
291 |// Set current VM state. Uses TMP0.
292 |.macro li_vmstate, st; li TMP0, ~LJ_VMST_..st; .endmacro
293 |.macro st_vmstate; sw TMP0, DISPATCH_GL(vmstate)(DISPATCH); .endmacro
295 |// Move table write barrier back. Overwrites mark and tmp.
296 |.macro barrierback, tab, mark, tmp, target
297 | lw tmp, DISPATCH_GL(gc.grayagain)(DISPATCH)
298 | andi mark, mark, ~LJ_GC_BLACK & 255 // black2gray(tab)
299 | sw tab, DISPATCH_GL(gc.grayagain)(DISPATCH)
300 | sb mark, tab->marked
302 |. sw tmp, tab->gclist
305 |//-----------------------------------------------------------------------
307 /* Generate subroutines used by opcodes and other parts of the VM. */
308 /* The .code_sub section should be last to help static branch prediction. */
309 static void build_subroutines(BuildCtx *ctx)
313 |//-----------------------------------------------------------------------
314 |//-- Return handling ----------------------------------------------------
315 |//-----------------------------------------------------------------------
318 | // See vm_return. Also: TMP2 = previous base.
319 | andi AT, PC, FRAME_P
320 | beqz AT, ->cont_dispatch
323 | // Return from pcall or xpcall fast func.
324 | lw PC, FRAME_PC(TMP2) // Fetch PC of previous frame.
325 | move BASE, TMP2 // Restore caller base.
326 | // Prepending may overwrite the pcall frame, so do it at the end.
327 | sw TMP1, FRAME_PC(RA) // Prepend true to results.
331 | addiu RD, RD, 8 // RD = (nresults+1)*8.
332 | andi TMP0, PC, FRAME_TYPE
333 | beqz RD, ->vm_unwind_c_eh
334 |. li CRET1, LUA_YIELD
335 | beqz TMP0, ->BC_RET_Z // Handle regular return to Lua.
339 | // BASE = base, RA = resultptr, RD/MULTRES = (nresults+1)*8, PC = return
340 | // TMP0 = PC & FRAME_TYPE
342 | xori AT, TMP0, FRAME_C
344 | bnez AT, ->vm_returnp
345 | subu TMP2, BASE, TMP2 // TMP2 = previous base.
351 | addiu BASE, BASE, -8
356 | addiu TMP1, TMP1, -8
361 |. addiu BASE, BASE, 8
366 |. sw BASE, L->top // Store new top.
369 | lw TMP0, SAVE_CFRAME // Restore previous C frame.
370 | move CRET1, r0 // Ok return status for vm_pcall.
377 | lw TMP1, L->maxstack
379 | bnez AT, >7 // Less results wanted?
380 | // More results wanted. Check stack size and fill up results with nil.
381 |. slt AT, BASE, TMP1
384 | sw TISNIL, HI(BASE)
387 |. addiu BASE, BASE, 8
389 |7: // Less results wanted.
390 | subu TMP0, RD, TMP2
391 | subu TMP0, BASE, TMP0 // Either keep top or shrink it.
393 |. movn BASE, TMP0, TMP2 // LUA_MULTRET+1 case?
395 |8: // Corner case: need to grow stack for filling up results.
396 | // This can happen if:
397 | // - A C function grows the stack (a lot).
398 | // - The GC shrinks the stack in between.
399 | // - A return back from a lua_call() with (high) nresults adjustment.
400 | load_got lj_state_growstack
403 | call_intern lj_state_growstack // (lua_State *L, int n)
406 | lw BASE, L->top // Need the (realloced) L->top in BASE.
411 |->vm_unwind_c: // Unwind C stack, return from vm_pcall.
412 | // (void *cframe, int errcode)
415 |->vm_unwind_c_eh: // Landing pad for external unwinder.
417 | li TMP0, ~LJ_VMST_C
418 | lw GL:TMP1, L->glref
420 |. sw TMP0, GL:TMP1->vmstate
422 |->vm_unwind_ff: // Unwind C stack, return from ff pcall.
426 |->vm_unwind_ff_eh: // Landing pad for external unwinder.
428 | lui TMP3, 0x59c0 // TOBIT = 2^52 + 2^51 (float).
431 | lw DISPATCH, L->glref // Setup pointer to dispatch table.
435 | lw PC, FRAME_PC(BASE) // Fetch PC of previous frame.
436 | cvt.d.s TOBIT, TOBIT
437 | addiu RA, BASE, -8 // Results start at BASE-8.
438 | addiu DISPATCH, DISPATCH, GG_G2DISP
439 | sw TMP1, HI(RA) // Prepend false to error message.
442 |. li RD, 16 // 2 results: false + error message.
444 |//-----------------------------------------------------------------------
445 |//-- Grow stack for calls -----------------------------------------------
446 |//-----------------------------------------------------------------------
448 |->vm_growstack_c: // Grow stack for C function.
450 |. li CARG2, LUA_MINSTACK
452 |->vm_growstack_l: // Grow stack for Lua function.
453 | // BASE = new base, RA = BASE+framesize*8, RC = nargs*8, PC = first PC
457 | addiu PC, PC, 4 // Must point after first instruction.
461 | // L->base = new base, L->top = top
462 | load_got lj_state_growstack
464 | call_intern lj_state_growstack // (lua_State *L, int n)
468 | lw LFUNC:RB, FRAME_FUNC(BASE)
470 | // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
471 | ins_callt // Just retry the call.
473 |//-----------------------------------------------------------------------
474 |//-- Entry points into the assembler VM ---------------------------------
475 |//-----------------------------------------------------------------------
477 |->vm_resume: // Setup C frame and resume thread.
478 | // (lua_State *L, TValue *base, int nres1 = 0, ptrdiff_t ef = 0)
481 | lw DISPATCH, L->glref // Setup pointer to dispatch table.
483 | lbu TMP1, L->status
486 | addiu TMP0, sp, CFRAME_RESUME
487 | addiu DISPATCH, DISPATCH, GG_G2DISP
490 | sw CARG1, SAVE_PC // Any value outside of bytecode is ok.
493 |. sw TMP0, L->cframe
495 | // Resume after yield (like a return).
496 | sw L, DISPATCH_GL(cur_L)(DISPATCH)
500 | lw PC, FRAME_PC(BASE)
501 | lui TMP3, 0x59c0 // TOBIT = 2^52 + 2^51 (float).
502 | subu RD, TMP1, BASE
505 | cvt.d.s TOBIT, TOBIT
510 | andi TMP0, PC, FRAME_TYPE
511 | beqz TMP0, ->BC_RET_Z
512 |. li TISNIL, LJ_TNIL
516 |->vm_pcall: // Setup protected C frame and enter VM.
517 | // (lua_State *L, TValue *base, int nres1, ptrdiff_t ef)
519 | sw CARG4, SAVE_ERRF
523 |->vm_call: // Setup C frame and enter VM.
524 | // (lua_State *L, TValue *base, int nres1)
528 |1: // Entry point for vm_pcall above (PC = ftype).
529 | lw TMP1, L:CARG1->cframe
531 | sw CARG3, SAVE_NRES
532 | lw DISPATCH, L->glref // Setup pointer to dispatch table.
535 | addiu DISPATCH, DISPATCH, GG_G2DISP
536 | sw CARG1, SAVE_PC // Any value outside of bytecode is ok.
537 | sw TMP1, SAVE_CFRAME
538 | sw sp, L->cframe // Add our C frame to cframe chain.
540 |3: // Entry point for vm_cpcall/vm_resume (BASE = base, PC = ftype).
541 | sw L, DISPATCH_GL(cur_L)(DISPATCH)
542 | lw TMP2, L->base // TMP2 = old base (used in vmeta_call).
543 | lui TMP3, 0x59c0 // TOBIT = 2^52 + 2^51 (float).
547 | subu NARGS8:RC, TMP1, BASE
548 | subu PC, PC, TMP2 // PC = frame delta + frame type
549 | cvt.d.s TOBIT, TOBIT
555 | // TMP2 = old base, BASE = new base, RC = nargs*8, PC = caller PC
556 | lw TMP0, FRAME_PC(BASE)
558 | bne TMP0, AT, ->vmeta_call
559 |. lw LFUNC:RB, FRAME_FUNC(BASE)
561 |->vm_call_dispatch_f:
563 | // BASE = new base, RB = func, RC = nargs*8, PC = caller PC
565 |->vm_cpcall: // Setup protected C frame, call C.
566 | // (lua_State *L, lua_CFunction func, void *ud, lua_CPFunction cp)
569 | lw TMP0, L:CARG1->stack
572 | lw DISPATCH, L->glref // Setup pointer to dispatch table.
573 | sw CARG1, SAVE_PC // Any value outside of bytecode is ok.
574 | subu TMP0, TMP0, TMP1 // Compute -savestack(L, L->top).
576 | addiu DISPATCH, DISPATCH, GG_G2DISP
577 | sw TMP0, SAVE_NRES // Neg. delta means cframe w/o frame.
578 | sw r0, SAVE_ERRF // No error function.
579 | sw TMP1, SAVE_CFRAME
580 | sw sp, L->cframe // Add our C frame to cframe chain.
581 | sw L, DISPATCH_GL(cur_L)(DISPATCH)
582 | jalr CARG4 // (lua_State *L, lua_CFunction func, void *ud)
583 |. move CFUNCADDR, CARG4
585 | bnez CRET1, <3 // Else continue with the call.
587 | b ->vm_leave_cp // No base? Just remove C frame.
590 |//-----------------------------------------------------------------------
591 |//-- Metamethod handling ------------------------------------------------
592 |//-----------------------------------------------------------------------
594 |// The lj_meta_* functions (except for lj_meta_cat) don't reallocate the
595 |// stack, so BASE doesn't need to be reloaded across these calls.
597 |//-- Continuation dispatch ----------------------------------------------
600 | // BASE = meta base, RA = resultptr, RD = (nresults+1)*8
601 | lw TMP0, -16+LO(BASE) // Continuation.
603 | move BASE, TMP2 // Restore caller BASE.
604 | lw LFUNC:TMP1, FRAME_FUNC(TMP2)
608 | lw PC, -16+HI(RB) // Restore PC from [cont|PC].
610 | lw TMP1, LFUNC:TMP1->pc
614 |. sw TISNIL, -8+HI(TMP2) // Ensure one valid arg.
615 | // BASE = base, RA = resultptr, RB = meta base
616 | jr TMP0 // Jump to continuation.
617 |. lw KBASE, PC2PROTO(k)(TMP1)
621 | bnez TMP0, ->cont_ffi_callback // cont = 1: return from FFI callback.
622 | // cont = 0: tailcall from C function.
623 |. addiu TMP1, RB, -16
625 |. subu RC, TMP1, BASE
628 |->cont_cat: // RA = resultptr, RB = meta base
630 | addiu CARG2, RB, -16
632 | decode_RB8a MULTRES, INS
633 | decode_RA8a RA, INS
634 | decode_RB8b MULTRES
636 | addu TMP1, BASE, MULTRES
638 | subu CARG3, CARG2, TMP1
639 | bne TMP1, CARG2, ->BC_CAT_Z
645 |//-- Table indexing metamethods -----------------------------------------
648 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
650 | sw STR:RC, LO(CARG3)
652 |. sw TMP0, HI(CARG3)
655 | addiu CARG2, DISPATCH, DISPATCH_GL(tmptv)
657 | sw TAB:RB, LO(CARG2)
658 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv2)
661 | sw STR:RC, LO(CARG3)
663 |. sw TMP1, HI(CARG3)
665 |->vmeta_tgetb: // TMP0 = index
668 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
673 | load_got lj_meta_tget
676 | call_intern lj_meta_tget // (lua_State *L, TValue *o, TValue *k)
678 | // Returns TValue * (finished) or NULL (metamethod).
680 |. addiu TMP1, BASE, -FRAME_CONT
686 |3: // Call __index metamethod.
687 | // BASE = base, L->top = new base, stack = cont/func/t/k
689 | sw PC, -16+HI(BASE) // [cont|PC]
690 | subu PC, BASE, TMP1
691 | lw LFUNC:RB, FRAME_FUNC(BASE) // Guaranteed to be a function here.
692 | b ->vm_call_dispatch_f
693 |. li NARGS8:RC, 16 // 2 args for func(t, k).
696 | load_got lj_tab_getinth
697 | call_intern lj_tab_getinth // (GCtab *t, int32_t key)
699 | // Returns cTValue * or NULL.
705 |//-----------------------------------------------------------------------
708 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
710 | sw STR:RC, LO(CARG3)
712 |. sw TMP0, HI(CARG3)
715 | addiu CARG2, DISPATCH, DISPATCH_GL(tmptv)
717 | sw TAB:RB, LO(CARG2)
718 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv2)
721 | sw STR:RC, LO(CARG3)
723 |. sw TMP1, HI(CARG3)
725 |->vmeta_tsetb: // TMP0 = index
728 | addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
733 | load_got lj_meta_tset
736 | call_intern lj_meta_tset // (lua_State *L, TValue *o, TValue *k)
738 | // Returns TValue * (finished) or NULL (metamethod).
741 | // NOBARRIER: lj_meta_tset ensures the table is not black.
746 |3: // Call __newindex metamethod.
747 | // BASE = base, L->top = new base, stack = cont/func/t/k/(v)
748 | addiu TMP1, BASE, -FRAME_CONT
750 | sw PC, -16+HI(BASE) // [cont|PC]
751 | subu PC, BASE, TMP1
752 | lw LFUNC:RB, FRAME_FUNC(BASE) // Guaranteed to be a function here.
753 | sdc1 f0, 16(BASE) // Copy value to third argument.
754 | b ->vm_call_dispatch_f
755 |. li NARGS8:RC, 24 // 3 args for func(t, k, v)
758 | load_got lj_tab_setinth
761 | call_intern lj_tab_setinth // (lua_State *L, GCtab *t, int32_t key)
763 | // Returns TValue *.
767 |//-- Comparison metamethods ---------------------------------------------
770 | // CARG2, CARG3 are already set by BC_ISLT/BC_ISGE/BC_ISLE/BC_ISGT.
771 | load_got lj_meta_comp
775 | decode_OP1 CARG4, INS
776 | call_intern lj_meta_comp // (lua_State *L, TValue *o1, *o2, int op)
778 | // Returns 0/1 or TValue * (metamethod).
781 | beqz AT, ->vmeta_binop
786 | lui TMP1, (-(BCBIAS_J*4 >> 16) & 65535)
794 |->cont_ra: // RA = resultptr
795 | lbu TMP1, -4+OFS_RA(PC)
798 | addu TMP1, BASE, TMP1
802 |->cont_condt: // RA = resultptr
804 | sltiu AT, TMP0, LJ_TISTRUECOND
806 |. negu TMP2, AT // Branch if result is true.
808 |->cont_condf: // RA = resultptr
810 | sltiu AT, TMP0, LJ_TISTRUECOND
812 |. addiu TMP2, AT, -1 // Branch if result is false.
815 | // CARG2, CARG3, CARG4 are already set by BC_ISEQV/BC_ISNEV.
816 | load_got lj_meta_equal
820 | call_intern lj_meta_equal // (lua_State *L, GCobj *o1, *o2, int ne)
822 | // Returns 0/1 or TValue * (metamethod).
828 | load_got lj_meta_equal_cd
833 | call_intern lj_meta_equal_cd // (lua_State *L, BCIns op)
835 | // Returns 0/1 or TValue * (metamethod).
841 | load_got lj_meta_istype
847 | call_intern lj_meta_istype // (lua_State *L, BCReg ra, BCReg tp)
852 |//-- Arithmetic metamethods ---------------------------------------------
858 | load_got lj_meta_arith
859 | decode_OP1 TMP0, INS
864 | call_intern lj_meta_arith // (lua_State *L, TValue *ra,*rb,*rc, BCReg op)
866 | // Returns NULL (finished) or TValue * (metamethod).
867 | beqz CRET1, ->cont_nop
870 | // Call metamethod for binary op.
872 | // BASE = old base, CRET1 = new base, stack = cont/func/o1/o2
873 | subu TMP1, CRET1, BASE
874 | sw PC, -16+HI(CRET1) // [cont|PC]
876 | addiu PC, TMP1, FRAME_CONT
878 | b ->vm_call_dispatch
879 |. li NARGS8:RC, 16 // 2 args for func(o1, o2).
882 | // CARG2 already set by BC_LEN.
884 | move MULTRES, CARG1
886 | load_got lj_meta_len
889 | call_intern lj_meta_len // (lua_State *L, TValue *o)
891 | // Returns NULL (retry) or TValue * (metamethod base).
893 | bnez CRET1, ->vmeta_binop // Binop call for compatibility.
896 |. move CARG1, MULTRES
898 | b ->vmeta_binop // Binop call for compatibility.
902 |//-- Call metamethod ----------------------------------------------------
904 |->vmeta_call: // Resolve and call __call metamethod.
905 | // TMP2 = old base, BASE = new base, RC = nargs*8
906 | load_got lj_meta_call
907 | sw TMP2, L->base // This is the callers base!
908 | addiu CARG2, BASE, -8
910 | addu CARG3, BASE, RC
911 | move MULTRES, NARGS8:RC
912 | call_intern lj_meta_call // (lua_State *L, TValue *func, TValue *top)
914 | lw LFUNC:RB, FRAME_FUNC(BASE) // Guaranteed to be a function here.
915 | addiu NARGS8:RC, MULTRES, 8 // Got one more argument now.
918 |->vmeta_callt: // Resolve __call for BC_CALLT.
919 | // BASE = old base, RA = new base, RC = nargs*8
920 | load_got lj_meta_call
922 | addiu CARG2, RA, -8
925 | move MULTRES, NARGS8:RC
926 | call_intern lj_meta_call // (lua_State *L, TValue *func, TValue *top)
928 | lw TMP1, FRAME_PC(BASE)
929 | lw LFUNC:RB, FRAME_FUNC(RA) // Guaranteed to be a function here.
931 |. addiu NARGS8:RC, MULTRES, 8 // Got one more argument now.
933 |//-- Argument coercion for 'for' statement ------------------------------
936 | load_got lj_meta_for
941 | call_intern lj_meta_for // (lua_State *L, TValue *base)
944 | decode_OP1 TMP0, MULTRES
947 | decode_RA8a RA, MULTRES
948 | decode_RD8a RD, MULTRES
951 | beq TMP0, AT, =>BC_JFORI
960 |//-----------------------------------------------------------------------
961 |//-- Fast functions -----------------------------------------------------
962 |//-----------------------------------------------------------------------
968 |.macro .ffunc_1, name
970 | beqz NARGS8:RC, ->fff_fallback
971 |. lw CARG3, HI(BASE)
975 |.macro .ffunc_2, name
977 | sltiu AT, NARGS8:RC, 16
979 | bnez AT, ->fff_fallback
980 |. lw CARG4, 8+HI(BASE)
982 | lw CARG2, 8+LO(BASE)
985 |.macro .ffunc_n, name // Caveat: has delay slot!
988 | beqz NARGS8:RC, ->fff_fallback
989 |. ldc1 FARG1, 0(BASE)
990 | sltiu AT, CARG3, LJ_TISNUM
991 | beqz AT, ->fff_fallback
994 |.macro .ffunc_nn, name // Caveat: has delay slot!
996 | sltiu AT, NARGS8:RC, 16
998 | bnez AT, ->fff_fallback
999 |. lw CARG4, 8+HI(BASE)
1000 | ldc1 FARG1, 0(BASE)
1001 | ldc1 FARG2, 8(BASE)
1002 | sltiu TMP0, CARG3, LJ_TISNUM
1003 | sltiu TMP1, CARG4, LJ_TISNUM
1004 | and TMP0, TMP0, TMP1
1005 | beqz TMP0, ->fff_fallback
1008 |// Inlined GC threshold check. Caveat: uses TMP0 and TMP1 and has delay slot!
1010 | lw TMP0, DISPATCH_GL(gc.total)(DISPATCH)
1011 | lw TMP1, DISPATCH_GL(gc.threshold)(DISPATCH)
1012 | subu AT, TMP0, TMP1
1013 | bgezal AT, ->fff_gcstep
1016 |//-- Base library: checks -----------------------------------------------
1019 | sltiu AT, CARG3, LJ_TISTRUECOND
1020 | beqz AT, ->fff_fallback
1021 |. addiu RA, BASE, -8
1022 | lw PC, FRAME_PC(BASE)
1023 | addiu RD, NARGS8:RC, 8 // Compute (nresults+1)*8.
1024 | addu TMP2, RA, NARGS8:RC
1026 | addiu TMP1, BASE, 8
1027 | beq BASE, TMP2, ->fff_res // Done if exactly 1 argument.
1032 | bne TMP1, TMP2, <1
1033 |. addiu TMP1, TMP1, 8
1038 | lw CARG3, HI(BASE)
1039 | li TMP1, LJ_TISNUM
1040 | beqz NARGS8:RC, ->fff_fallback
1041 |. sltiu TMP0, CARG3, LJ_TISNUM
1042 | movz TMP1, CARG3, TMP0
1045 | addu TMP1, CFUNC:RB, TMP1
1047 |. ldc1 FRET1, CFUNC:TMP1->upvalue
1049 |//-- Base library: getters and setters ---------------------------------
1051 |.ffunc_1 getmetatable
1055 |1: // Field metatable must be at same offset for GCtab and GCudata!
1056 | lw TAB:CARG1, TAB:CARG1->metatable
1058 | lw STR:RC, DISPATCH_GL(gcroot[GCROOT_MMNAME+MM_metatable])(DISPATCH)
1059 | beqz TAB:CARG1, ->fff_restv
1060 |. li CARG3, LJ_TNIL
1061 | lw TMP0, TAB:CARG1->hmask
1062 | li CARG3, LJ_TTAB // Use metatable as default result.
1063 | lw TMP1, STR:RC->hash
1064 | lw NODE:TMP2, TAB:CARG1->node
1065 | and TMP1, TMP1, TMP0 // idx = str->hash & tab->hmask
1068 | subu TMP1, TMP0, TMP1
1069 | addu NODE:TMP2, NODE:TMP2, TMP1 // node = tab->node + (idx*32-idx*8)
1071 |3: // Rearranged logic, because we expect _not_ to find the key.
1072 | lw CARG4, offsetof(Node, key)+HI(NODE:TMP2)
1073 | lw TMP0, offsetof(Node, key)+LO(NODE:TMP2)
1074 | lw NODE:TMP3, NODE:TMP2->next
1076 |. lw CARG2, offsetof(Node, val)+HI(NODE:TMP2)
1077 | beq TMP0, STR:RC, >5
1078 |. lw TMP1, offsetof(Node, val)+LO(NODE:TMP2)
1080 | beqz NODE:TMP3, ->fff_restv // Not found, keep default result.
1081 |. move NODE:TMP2, NODE:TMP3
1085 | beq CARG2, TISNIL, ->fff_restv // Ditto for nil value.
1087 | move CARG3, CARG2 // Return value of mt.__metatable.
1093 |. sltiu TMP0, CARG3, LJ_TISNUM
1094 | li TMP1, LJ_TISNUM
1095 | movz TMP1, CARG3, TMP0
1098 | addu TMP1, DISPATCH, TMP1
1100 |. lw TAB:CARG1, DISPATCH_GL(gcroot[GCROOT_BASEMT])(TMP1)
1102 |.ffunc_2 setmetatable
1103 | // Fast path: no mt for table yet and not clearing the mt.
1105 | bne CARG3, AT, ->fff_fallback
1106 |. addiu CARG4, CARG4, -LJ_TTAB
1107 | lw TAB:TMP1, TAB:CARG1->metatable
1108 | lbu TMP3, TAB:CARG1->marked
1109 | or AT, CARG4, TAB:TMP1
1110 | bnez AT, ->fff_fallback
1111 |. andi AT, TMP3, LJ_GC_BLACK // isblack(table)
1112 | beqz AT, ->fff_restv
1113 |. sw TAB:CARG2, TAB:CARG1->metatable
1114 | barrierback TAB:CARG1, TMP3, TMP0, ->fff_restv
1117 | lw CARG4, HI(BASE)
1118 | sltiu AT, NARGS8:RC, 16
1119 | lw TAB:CARG2, LO(BASE)
1120 | load_got lj_tab_get
1121 | addiu CARG4, CARG4, -LJ_TTAB
1123 | bnez AT, ->fff_fallback
1124 | addiu CARG3, BASE, 8
1125 | call_intern lj_tab_get // (lua_State *L, GCtab *t, cTValue *key)
1127 | // Returns cTValue *.
1129 |. ldc1 FRET1, 0(CRET1)
1131 |//-- Base library: conversions ------------------------------------------
1134 | // Only handles the number case inline (without a base argument).
1135 | lw CARG1, HI(BASE)
1136 | xori AT, NARGS8:RC, 8
1137 | sltiu CARG1, CARG1, LJ_TISNUM
1138 | movn CARG1, r0, AT
1139 | beqz CARG1, ->fff_fallback // Exactly one number argument.
1140 |. ldc1 FRET1, 0(BASE)
1145 | // Only handles the string or number case inline.
1147 | // A __tostring method in the string base metatable is ignored.
1148 | beq CARG3, AT, ->fff_restv // String key?
1149 | // Handle numbers inline, unless a number base metatable is present.
1150 |. lw TMP1, DISPATCH_GL(gcroot[GCROOT_BASEMT_NUM])(DISPATCH)
1151 | sltiu TMP0, CARG3, LJ_TISNUM
1152 | sltiu TMP1, TMP1, 1
1153 | and TMP0, TMP0, TMP1
1154 | beqz TMP0, ->fff_fallback
1155 |. sw BASE, L->base // Add frame since C call can throw.
1157 |. sw PC, SAVE_PC // Redundant (but a defined value).
1158 | load_got lj_strfmt_num
1160 | call_intern lj_strfmt_num // (lua_State *L, lua_Number *np)
1162 | // Returns GCstr *.
1165 |. move CARG1, CRET1
1167 |//-- Base library: iterators -------------------------------------------
1170 | lw CARG1, HI(BASE)
1171 | lw TAB:CARG2, LO(BASE)
1172 | beqz NARGS8:RC, ->fff_fallback
1173 |. addu TMP2, BASE, NARGS8:RC
1175 | sw TISNIL, HI(TMP2) // Set missing 2nd arg to nil.
1176 | bne CARG1, AT, ->fff_fallback
1177 |. lw PC, FRAME_PC(BASE)
1178 | load_got lj_tab_next
1179 | sw BASE, L->base // Add frame since C call can throw.
1180 | sw BASE, L->top // Dummy frame length is ok.
1181 | addiu CARG3, BASE, 8
1183 | call_intern lj_tab_next // (lua_State *L, GCtab *t, TValue *key)
1185 | // Returns 0 at end of traversal.
1186 | beqz CRET1, ->fff_restv // End of traversal: return nil.
1187 |. li CARG3, LJ_TNIL
1188 | ldc1 f0, 8(BASE) // Copy key and value to results.
1189 | addiu RA, BASE, -8
1198 | bne CARG3, AT, ->fff_fallback
1199 |. lw PC, FRAME_PC(BASE)
1201 | lw TAB:TMP2, TAB:CARG1->metatable
1202 | ldc1 f0, CFUNC:RB->upvalue[0]
1203 | bnez TAB:TMP2, ->fff_fallback
1205 | ldc1 f0, CFUNC:RB->upvalue[0]
1207 |. addiu RA, BASE, -8
1208 | sw TISNIL, 8+HI(BASE)
1214 | sltiu AT, NARGS8:RC, 16
1215 | lw CARG3, HI(BASE)
1216 | lw TAB:CARG1, LO(BASE)
1217 | lw CARG4, 8+HI(BASE)
1218 | bnez AT, ->fff_fallback
1219 |. ldc1 FARG2, 8(BASE)
1220 | addiu CARG3, CARG3, -LJ_TTAB
1221 | sltiu AT, CARG4, LJ_TISNUM
1223 | movn AT, r0, CARG3
1225 | beqz AT, ->fff_fallback
1226 |. lw PC, FRAME_PC(BASE)
1227 | trunc.w.d FRET1, FARG2
1228 | cvt.d.w FARG1, FARG1
1229 | lw TMP0, TAB:CARG1->asize
1230 | lw TMP1, TAB:CARG1->array
1232 | addiu RA, BASE, -8
1233 | add.d FARG2, FARG2, FARG1
1234 | addiu TMP2, TMP2, 1
1235 | sltu AT, TMP2, TMP0
1237 | addu TMP3, TMP1, TMP3
1238 | beqz AT, >2 // Not in array part?
1239 |. sdc1 FARG2, 0(RA)
1243 | beq TMP2, TISNIL, ->fff_res // End of iteration, return 0 results.
1248 |2: // Check for empty hash part first. Otherwise call C function.
1249 | lw TMP0, TAB:CARG1->hmask
1250 | load_got lj_tab_getinth
1251 | beqz TMP0, ->fff_res
1253 | call_intern lj_tab_getinth // (GCtab *t, int32_t key)
1255 | // Returns cTValue * or NULL.
1256 | beqz CRET1, ->fff_res
1258 | lw TMP2, HI(CRET1)
1260 |. ldc1 f0, 0(CRET1)
1264 | bne CARG3, AT, ->fff_fallback
1265 |. lw PC, FRAME_PC(BASE)
1267 | lw TAB:TMP2, TAB:CARG1->metatable
1268 | ldc1 f0, CFUNC:RB->upvalue[0]
1269 | bnez TAB:TMP2, ->fff_fallback
1271 | ldc1 f0, CFUNC:RB->upvalue[0]
1273 |. addiu RA, BASE, -8
1280 |//-- Base library: catch errors ----------------------------------------
1283 | lbu TMP3, DISPATCH_GL(hookmask)(DISPATCH)
1284 | beqz NARGS8:RC, ->fff_fallback
1286 | addiu BASE, BASE, 8
1287 | // Remember active hook before pcall.
1288 | srl TMP3, TMP3, HOOK_ACTIVE_SHIFT
1289 | andi TMP3, TMP3, 1
1290 | addiu PC, TMP3, 8+FRAME_PCALL
1291 | b ->vm_call_dispatch
1292 |. addiu NARGS8:RC, NARGS8:RC, -8
1295 | sltiu AT, NARGS8:RC, 16
1296 | lw CARG4, 8+HI(BASE)
1297 | bnez AT, ->fff_fallback
1298 |. ldc1 FARG2, 8(BASE)
1299 | ldc1 FARG1, 0(BASE)
1300 | lbu TMP1, DISPATCH_GL(hookmask)(DISPATCH)
1303 | bne CARG4, AT, ->fff_fallback // Traceback must be a function.
1304 | addiu BASE, BASE, 16
1305 | // Remember active hook before pcall.
1306 | srl TMP3, TMP3, HOOK_ACTIVE_SHIFT
1307 | sdc1 FARG2, 0(TMP2) // Swap function and traceback.
1308 | andi TMP3, TMP3, 1
1309 | sdc1 FARG1, 8(TMP2)
1310 | addiu PC, TMP3, 16+FRAME_PCALL
1311 | b ->vm_call_dispatch
1312 |. addiu NARGS8:RC, NARGS8:RC, -16
1314 |//-- Coroutine library --------------------------------------------------
1316 |.macro coroutine_resume_wrap, resume
1318 |.ffunc_1 coroutine_resume
1320 | bne CARG3, AT, ->fff_fallback
1322 |.ffunc coroutine_wrap_aux
1323 | lw L:CARG1, CFUNC:RB->upvalue[0].gcr
1325 | lbu TMP0, L:CARG1->status
1326 | lw TMP1, L:CARG1->cframe
1327 | lw CARG2, L:CARG1->top
1328 | lw TMP2, L:CARG1->base
1329 | addiu TMP3, TMP0, -LUA_YIELD
1330 | bgtz TMP3, ->fff_fallback // st > LUA_YIELD?
1331 |. xor TMP2, TMP2, CARG2
1332 | bnez TMP1, ->fff_fallback // cframe != 0?
1333 |. or AT, TMP2, TMP0
1334 | lw TMP0, L:CARG1->maxstack
1335 | beqz AT, ->fff_fallback // base == top && st == 0?
1336 |. lw PC, FRAME_PC(BASE)
1337 | addu TMP2, CARG2, NARGS8:RC
1338 | sltu AT, TMP0, TMP2
1339 | bnez AT, ->fff_fallback // Stack overflow?
1344 | addiu BASE, BASE, 8 // Keep resumed thread in stack for GC.
1345 | addiu NARGS8:RC, NARGS8:RC, -8
1346 | addiu TMP2, TMP2, -8
1348 | sw TMP2, L:CARG1->top
1349 | addu TMP1, BASE, NARGS8:RC
1352 |2: // Move args to coroutine.
1354 | sltu AT, BASE, TMP1
1356 |. addiu BASE, BASE, 8
1359 |. addiu CARG3, CARG3, 8
1361 | bal ->vm_resume // (lua_State *L, TValue *base, 0, 0)
1362 |. move L:RA, L:CARG1
1363 | // Returns thread status.
1365 | lw TMP2, L:RA->base
1366 | sltiu AT, CRET1, LUA_YIELD+1
1367 | lw TMP3, L:RA->top
1370 | sw L, DISPATCH_GL(cur_L)(DISPATCH)
1373 |. subu RD, TMP3, TMP2
1374 | lw TMP0, L->maxstack
1375 | beqz RD, >6 // No results?
1376 |. addu TMP1, BASE, RD
1377 | sltu AT, TMP0, TMP1
1378 | bnez AT, >9 // Need to grow stack?
1379 |. addu TMP3, TMP2, RD
1380 | sw TMP2, L:RA->top // Clear coroutine stack.
1382 |5: // Move results from coroutine.
1384 | addiu TMP2, TMP2, 8
1385 | sltu AT, TMP2, TMP3
1388 |. addiu TMP1, TMP1, 8
1390 | andi TMP0, PC, FRAME_TYPE
1393 | addiu RA, BASE, -8
1394 | sw TMP1, -8+HI(BASE) // Prepend true to results.
1402 | beqz TMP0, ->BC_RET_Z
1407 |8: // Coroutine returned with error (at co->top-1).
1409 | addiu TMP3, TMP3, -8
1410 | li TMP1, LJ_TFALSE
1412 | sw TMP3, L:RA->top // Remove error from coroutine stack.
1414 | sw TMP1, -8+HI(BASE) // Prepend false to results.
1415 | addiu RA, BASE, -8
1416 | sdc1 f0, 0(BASE) // Copy error message.
1418 |. andi TMP0, PC, FRAME_TYPE
1420 | load_got lj_ffh_coroutine_wrap_err
1422 | call_intern lj_ffh_coroutine_wrap_err // (lua_State *L, lua_State *co)
1426 |9: // Handle stack expansion on return from yield.
1427 | load_got lj_state_growstack
1429 | call_intern lj_state_growstack // (lua_State *L, int n)
1435 | coroutine_resume_wrap 1 // coroutine.resume
1436 | coroutine_resume_wrap 0 // coroutine.wrap
1438 |.ffunc coroutine_yield
1439 | lw TMP0, L->cframe
1440 | addu TMP1, BASE, NARGS8:RC
1442 | andi TMP0, TMP0, CFRAME_RESUME
1444 | beqz TMP0, ->fff_fallback
1445 |. li CRET1, LUA_YIELD
1448 |. sb CRET1, L->status
1450 |//-- Math library -------------------------------------------------------
1453 |. abs.d FRET1, FARG1
1455 | lw PC, FRAME_PC(BASE)
1456 | addiu RA, BASE, -8
1458 |. sdc1 FRET1, -8(BASE)
1461 | // CARG3/CARG1 = TValue result.
1462 | lw PC, FRAME_PC(BASE)
1463 | sw CARG3, -8+HI(BASE)
1464 | addiu RA, BASE, -8
1465 | sw CARG1, -8+LO(BASE)
1467 | // RA = results, PC = return.
1470 | // RA = results, RD = (nresults+1)*8, PC = return.
1471 | andi TMP0, PC, FRAME_TYPE
1472 | bnez TMP0, ->vm_return
1475 | decode_RB8a RB, INS
1479 | bnez AT, >6 // More results expected?
1480 |. decode_RA8a TMP0, INS
1483 | // Adjust BASE. KBASE is assumed to be set for the calling frame.
1484 | subu BASE, RA, TMP0
1487 |6: // Fill up results with nil.
1491 |. sw TISNIL, -8+HI(TMP1)
1493 |.macro math_extern, func
1494 |->ff_math_ .. func:
1495 | lw CARG3, HI(BASE)
1496 | beqz NARGS8:RC, ->fff_fallback
1498 | sltiu AT, CARG3, LJ_TISNUM
1499 | beqz AT, ->fff_fallback
1502 |. ldc1 FARG1, 0(BASE)
1507 |.macro math_extern2, func
1508 | .ffunc_nn math_ .. func
1516 |.macro math_round, func
1517 | .ffunc_n math_ .. func
1529 | lw CARG3, HI(BASE)
1531 | bne NARGS8:RC, AT, ->fff_fallback // Exactly 1 argument.
1533 | sltiu AT, CARG3, LJ_TISNUM
1534 | beqz AT, ->fff_fallback
1537 |. ldc1 FARG1, 0(BASE)
1553 | math_extern2 atan2
1557 |. sqrt.d FRET1, FARG1
1561 |.ffunc_nn math_ldexp
1562 | trunc.w.d FARG2, FARG2
1570 |.ffunc_n math_frexp
1572 | lw PC, FRAME_PC(BASE)
1574 |. addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
1575 | lw TMP1, DISPATCH_GL(tmptv)(DISPATCH)
1576 | addiu RA, BASE, -8
1579 | cvt.d.w FARG2, FARG2
1586 | lw PC, FRAME_PC(BASE)
1588 |. addiu CARG3, BASE, -8
1589 | addiu RA, BASE, -8
1590 | sdc1 FRET1, 0(BASE)
1594 |.macro math_minmax, name, ismax
1596 | lw CARG3, HI(BASE)
1597 | beqz NARGS8:RC, ->fff_fallback
1598 |. ldc1 FRET1, 0(BASE)
1599 | sltiu AT, CARG3, LJ_TISNUM
1600 | beqz AT, ->fff_fallback
1601 |. addu TMP2, BASE, NARGS8:RC
1602 | addiu TMP1, BASE, 8
1603 | beq TMP1, TMP2, ->fff_resn
1605 |. lw CARG3, HI(TMP1)
1606 | ldc1 FARG1, 0(TMP1)
1607 | addiu TMP1, TMP1, 8
1608 | sltiu AT, CARG3, LJ_TISNUM
1609 | beqz AT, ->fff_fallback
1611 |. c.olt.d FARG1, FRET1
1613 |. c.olt.d FRET1, FARG1
1615 | bne TMP1, TMP2, <1
1616 |. movf.d FRET1, FARG1
1621 | math_minmax math_min, 0
1622 | math_minmax math_max, 1
1624 |//-- String library -----------------------------------------------------
1626 |.ffunc string_byte // Only handle the 1-arg case here.
1627 | lw CARG3, HI(BASE)
1628 | lw STR:CARG1, LO(BASE)
1629 | xori AT, NARGS8:RC, 8
1630 | addiu CARG3, CARG3, -LJ_TSTR
1632 | bnez AT, ->fff_fallback // Need exactly 1 string argument.
1634 | lw TMP0, STR:CARG1->len
1635 | lbu TMP1, STR:CARG1[1] // Access is always ok (NUL at end).
1636 | addiu RA, BASE, -8
1641 | lw PC, FRAME_PC(BASE)
1642 | sll RD, RD, 3 // RD = ((str->len != 0)+1)*8
1646 |.ffunc string_char // Only handle the 1-arg case here.
1648 | lw CARG3, HI(BASE)
1649 | ldc1 FARG1, 0(BASE)
1651 | bne NARGS8:RC, AT, ->fff_fallback // Exactly 1 argument.
1652 |. sltiu AT, CARG3, LJ_TISNUM
1653 | beqz AT, ->fff_fallback
1655 | trunc.w.d FARG1, FARG1
1656 | addiu CARG2, sp, ARG5_OFS
1657 | sltiu AT, TMP0, 256
1659 | beqz AT, ->fff_fallback
1662 | load_got lj_str_new
1665 | call_intern lj_str_new // (lua_State *L, char *str, size_t l)
1667 | // Returns GCstr *.
1672 |. li CARG3, LJ_TSTR
1676 | addiu AT, NARGS8:RC, -16
1677 | lw CARG3, 16+HI(BASE)
1680 | lw STR:CARG1, LO(BASE)
1681 | bltz AT, ->fff_fallback
1682 | lw CARG2, 8+HI(BASE)
1687 | sltiu AT, CARG3, LJ_TISNUM
1688 | beqz AT, ->fff_fallback
1691 | sltiu AT, CARG2, LJ_TISNUM
1692 | beqz AT, ->fff_fallback
1695 | bne TMP0, AT, ->fff_fallback
1696 |. lw CARG2, STR:CARG1->len
1698 | // STR:CARG1 = str, CARG2 = str->len, CARG3 = start, CARG4 = end
1700 | addiu TMP0, CARG2, 1
1701 | addu TMP1, CARG4, TMP0
1702 | slt TMP3, CARG3, r0
1703 | movn CARG4, TMP1, AT // if (end < 0) end += len+1
1704 | addu TMP1, CARG3, TMP0
1705 | movn CARG3, TMP1, TMP3 // if (start < 0) start += len+1
1708 | slt TMP3, r0, CARG3
1709 | movn CARG4, r0, AT // if (end < 0) end = 0
1710 | movz CARG3, TMP2, TMP3 // if (start < 1) start = 1
1711 | slt AT, CARG2, CARG4
1712 | movn CARG4, CARG2, AT // if (end > len) end = len
1713 | addu CARG2, STR:CARG1, CARG3
1714 | subu CARG3, CARG4, CARG3 // len = end - start
1715 | addiu CARG2, CARG2, sizeof(GCstr)-1
1716 | bgez CARG3, ->fff_newstr
1717 |. addiu CARG3, CARG3, 1 // len++
1718 |->fff_emptystr: // Return empty string.
1719 | addiu STR:CARG1, DISPATCH, DISPATCH_GL(strempty)
1721 |. li CARG3, LJ_TSTR
1723 |.macro ffstring_op, name
1724 | .ffunc string_ .. name
1726 | lw CARG3, HI(BASE)
1727 | lw STR:CARG2, LO(BASE)
1728 | beqz NARGS8:RC, ->fff_fallback
1730 | bne CARG3, AT, ->fff_fallback
1731 |. addiu SBUF:CARG1, DISPATCH, DISPATCH_GL(tmpbuf)
1732 | load_got lj_buf_putstr_ .. name
1733 | lw TMP0, SBUF:CARG1->b
1734 | sw L, SBUF:CARG1->L
1736 | sw TMP0, SBUF:CARG1->p
1737 | call_intern extern lj_buf_putstr_ .. name
1739 | load_got lj_buf_tostr
1740 | call_intern lj_buf_tostr
1741 |. move SBUF:CARG1, SBUF:CRET1
1746 |ffstring_op reverse
1750 |//-- Bit library --------------------------------------------------------
1752 |.macro .ffunc_bit, name
1753 | .ffunc_n bit_..name
1754 |. add.d FARG1, FARG1, TOBIT
1758 |.macro .ffunc_bit_op, name, ins
1760 | addiu TMP1, BASE, 8
1761 | addu TMP2, BASE, NARGS8:RC
1763 | lw CARG4, HI(TMP1)
1764 | beq TMP1, TMP2, ->fff_resi
1765 |. ldc1 FARG1, 0(TMP1)
1766 | sltiu AT, CARG4, LJ_TISNUM
1767 | beqz AT, ->fff_fallback
1768 | add.d FARG1, FARG1, TOBIT
1770 | ins CRET1, CRET1, CARG2
1772 |. addiu TMP1, TMP1, 8
1775 |.ffunc_bit_op band, and
1776 |.ffunc_bit_op bor, or
1777 |.ffunc_bit_op bxor, xor
1780 | srl TMP0, CRET1, 24
1781 | srl TMP2, CRET1, 8
1782 | sll TMP1, CRET1, 24
1783 | andi TMP2, TMP2, 0xff00
1784 | or TMP0, TMP0, TMP1
1785 | andi CRET1, CRET1, 0xff00
1786 | or TMP0, TMP0, TMP2
1787 | sll CRET1, CRET1, 8
1789 |. or CRET1, TMP0, CRET1
1795 |.macro .ffunc_bit_sh, name, ins, shmod
1796 | .ffunc_nn bit_..name
1797 |. add.d FARG1, FARG1, TOBIT
1798 | add.d FARG2, FARG2, TOBIT
1803 | subu TMP0, AT, CARG2
1804 | sllv CARG2, CARG1, CARG2
1805 | srlv CARG1, CARG1, TMP0
1808 | subu TMP0, AT, CARG2
1809 | srlv CARG2, CARG1, CARG2
1810 | sllv CARG1, CARG1, TMP0
1813 |. ins CRET1, CARG1, CARG2
1816 |.ffunc_bit_sh lshift, sllv, 0
1817 |.ffunc_bit_sh rshift, srlv, 0
1818 |.ffunc_bit_sh arshift, srav, 0
1819 |// Can't use rotrv, since it's only in MIPS32R2.
1820 |.ffunc_bit_sh rol, or, 1
1821 |.ffunc_bit_sh ror, or, 2
1827 |. cvt.d.w FRET1, FRET1
1829 |//-----------------------------------------------------------------------
1831 |->fff_fallback: // Call fast function fallback handler.
1832 | // BASE = new base, RB = CFUNC, RC = nargs*8
1833 | lw TMP3, CFUNC:RB->f
1834 | addu TMP1, BASE, NARGS8:RC
1835 | lw PC, FRAME_PC(BASE) // Fallback may overwrite PC.
1836 | addiu TMP0, TMP1, 8*LUA_MINSTACK
1837 | lw TMP2, L->maxstack
1838 | sw PC, SAVE_PC // Redundant (but a defined value).
1839 | sltu AT, TMP2, TMP0
1842 | bnez AT, >5 // Need to grow stack.
1843 |. move CFUNCADDR, TMP3
1844 | jalr TMP3 // (lua_State *L)
1846 | // Either throws an error, or recovers and returns -1, 0 or nresults+1.
1849 | bgtz CRET1, ->fff_res // Returned nresults+1?
1850 |. addiu RA, BASE, -8
1851 |1: // Returned 0 or -1: retry fast path.
1853 | lw LFUNC:RB, FRAME_FUNC(BASE)
1854 | bnez CRET1, ->vm_call_tail // Returned -1?
1855 |. subu NARGS8:RC, TMP0, BASE
1856 | ins_callt // Returned 0: retry fast path.
1858 |// Reconstruct previous base for vmeta_call during tailcall.
1860 | andi TMP0, PC, FRAME_TYPE
1864 | lbu TMP1, OFS_RA(PC)
1866 | addiu TMP1, TMP1, 8
1868 | b ->vm_call_dispatch // Resolve again for tailcall.
1869 |. subu TMP2, BASE, TMP1
1871 |5: // Grow stack for fallback handler.
1872 | load_got lj_state_growstack
1873 | li CARG2, LUA_MINSTACK
1874 | call_intern lj_state_growstack // (lua_State *L, int n)
1878 |. li CRET1, 0 // Force retry.
1880 |->fff_gcstep: // Call GC step function.
1881 | // BASE = new base, RC = nargs*8
1883 | load_got lj_gc_step
1885 | addu TMP0, BASE, NARGS8:RC
1886 | sw PC, SAVE_PC // Redundant (but a defined value).
1888 | call_intern lj_gc_step // (lua_State *L)
1893 | lw CFUNC:RB, FRAME_FUNC(BASE)
1895 |. subu NARGS8:RC, TMP0, BASE
1897 |//-----------------------------------------------------------------------
1898 |//-- Special dispatch targets -------------------------------------------
1899 |//-----------------------------------------------------------------------
1901 |->vm_record: // Dispatch target for recording phase.
1903 | lbu TMP3, DISPATCH_GL(hookmask)(DISPATCH)
1904 | andi AT, TMP3, HOOK_VMEVENT // No recording while in vmevent.
1906 | // Decrement the hookcount for consistency, but always do the call.
1907 |. lw TMP2, DISPATCH_GL(hookcount)(DISPATCH)
1908 | andi AT, TMP3, HOOK_ACTIVE
1910 |. addiu TMP2, TMP2, -1
1911 | andi AT, TMP3, LUA_MASKLINE|LUA_MASKCOUNT
1915 |. sw TMP2, DISPATCH_GL(hookcount)(DISPATCH)
1918 |->vm_rethook: // Dispatch target for return hooks.
1919 | lbu TMP3, DISPATCH_GL(hookmask)(DISPATCH)
1920 | andi AT, TMP3, HOOK_ACTIVE // Hook already active?
1922 |5: // Re-dispatch to static ins.
1923 |. lw AT, GG_DISP2STATIC(TMP0) // Assumes TMP0 holds DISPATCH+OP*4.
1927 |->vm_inshook: // Dispatch target for instr/line hooks.
1928 | lbu TMP3, DISPATCH_GL(hookmask)(DISPATCH)
1929 | lw TMP2, DISPATCH_GL(hookcount)(DISPATCH)
1930 | andi AT, TMP3, HOOK_ACTIVE // Hook already active?
1932 |. andi AT, TMP3, LUA_MASKLINE|LUA_MASKCOUNT
1934 |. addiu TMP2, TMP2, -1
1936 |. sw TMP2, DISPATCH_GL(hookcount)(DISPATCH)
1937 | andi AT, TMP3, LUA_MASKLINE
1940 |. load_got lj_dispatch_ins
1941 | sw MULTRES, SAVE_MULTRES
1944 | // SAVE_PC must hold the _previous_ PC. The callee updates it with PC.
1945 | call_intern lj_dispatch_ins // (lua_State *L, const BCIns *pc)
1949 |4: // Re-dispatch to static ins.
1951 | decode_OP4a TMP1, INS
1953 | addu TMP0, DISPATCH, TMP1
1954 | decode_RD8a RD, INS
1955 | lw AT, GG_DISP2STATIC(TMP0)
1956 | decode_RA8a RA, INS
1961 |->cont_hook: // Continue from hook yield.
1964 |. lw MULTRES, -24+LO(RB) // Restore MULTRES for *M ins.
1966 |->vm_hotloop: // Hot loop counter underflow.
1968 | lw LFUNC:TMP1, FRAME_FUNC(BASE)
1969 | addiu CARG1, DISPATCH, GG_DISP2J
1971 | lw TMP1, LFUNC:TMP1->pc
1973 | sw L, DISPATCH_J(L)(DISPATCH)
1974 | lbu TMP1, PC2PROTO(framesize)(TMP1)
1975 | load_got lj_trace_hot
1978 | addu TMP1, BASE, TMP1
1979 | call_intern lj_trace_hot // (jit_State *J, const BCIns *pc)
1985 |->vm_callhook: // Dispatch target for call hooks.
1991 |->vm_hotcall: // Hot call counter underflow.
1996 | load_got lj_dispatch_call
1997 | addu TMP0, BASE, RC
2002 | call_intern lj_dispatch_call // (lua_State *L, const BCIns *pc)
2004 | // Returns ASMFunction.
2007 | sw r0, SAVE_PC // Invalidate for subsequent line hook.
2008 | subu NARGS8:RC, TMP0, BASE
2010 | lw LFUNC:RB, FRAME_FUNC(BASE)
2014 |->cont_stitch: // Trace stitching.
2016 | // RA = resultptr, RB = meta base
2018 | lw TMP3, -24+LO(RB) // Save previous trace number.
2019 | decode_RA8a RC, INS
2020 | addiu AT, MULTRES, -8
2023 |. addu RC, BASE, RC // Call base.
2024 |1: // Move results down.
2032 | decode_RA8a RA, INS
2033 | decode_RB8a RB, INS
2037 | lw TMP1, DISPATCH_J(trace)(DISPATCH)
2041 | bnez AT, >9 // More results wanted?
2042 |. sll TMP2, TMP3, 2
2044 | addu TMP2, TMP1, TMP2
2045 | lw TRACE:TMP2, 0(TMP2)
2046 | beqz TRACE:TMP2, ->cont_nop
2048 | lhu RD, TRACE:TMP2->link
2049 | beq RD, TMP3, ->cont_nop // Blacklisted.
2050 |. load_got lj_dispatch_stitch
2051 | bnez RD, =>BC_JLOOP // Jump to stitched trace.
2054 | // Stitch a new trace to the previous trace.
2055 | sw TMP3, DISPATCH_J(exitno)(DISPATCH)
2056 | sw L, DISPATCH_J(L)(DISPATCH)
2058 | addiu CARG1, DISPATCH, GG_DISP2J
2059 | call_intern lj_dispatch_stitch // (jit_State *J, const BCIns *pc)
2070 |->vm_profhook: // Dispatch target for profiler hook.
2072 | load_got lj_dispatch_profile
2073 | sw MULTRES, SAVE_MULTRES
2076 | call_intern lj_dispatch_profile // (lua_State *L, const BCIns *pc)
2078 | // HOOK_PROFILE is off again, so re-dispatch to dynamic instruction.
2084 |//-----------------------------------------------------------------------
2085 |//-- Trace exit handler -------------------------------------------------
2086 |//-----------------------------------------------------------------------
2088 |.macro savex_, a, b
2089 | sdc1 f..a, 16+a*8(sp)
2090 | sw r..a, 16+32*8+a*4(sp)
2091 | sw r..b, 16+32*8+b*4(sp)
2096 | addiu sp, sp, -(16+32*8+32*4)
2111 | sdc1 f28, 16+28*8(sp)
2112 | sw r28, 16+32*8+28*4(sp)
2113 | sdc1 f30, 16+30*8(sp)
2114 | sw r30, 16+32*8+30*4(sp)
2115 | sw r0, 16+32*8+31*4(sp) // Clear RID_TMP.
2117 | addiu TMP2, sp, 16+32*8+32*4 // Recompute original value of sp.
2118 | addiu DISPATCH, JGL, -GG_DISP2G-32768
2119 | lw TMP1, 0(TMP2) // Load exit number.
2121 | sw TMP2, 16+32*8+29*4(sp) // Store sp in RID_SP.
2122 | lw L, DISPATCH_GL(cur_L)(DISPATCH)
2123 | lw BASE, DISPATCH_GL(jit_base)(DISPATCH)
2124 | load_got lj_trace_exit
2125 | sw L, DISPATCH_J(L)(DISPATCH)
2126 | sw ra, DISPATCH_J(parent)(DISPATCH) // Store trace number.
2128 | sw TMP1, DISPATCH_J(exitno)(DISPATCH) // Store exit number.
2129 | addiu CARG1, DISPATCH, GG_DISP2J
2130 | sw r0, DISPATCH_GL(jit_base)(DISPATCH)
2131 | call_intern lj_trace_exit // (jit_State *J, ExitState *ex)
2132 |. addiu CARG2, sp, 16
2133 | // Returns MULTRES (unscaled) or negated error code.
2134 | lw TMP1, L->cframe
2138 | lw PC, SAVE_PC // Get SAVE_PC.
2140 |. sw L, SAVE_L // Set SAVE_L (on-trace resume/yield).
2144 | // CRET1 = MULTRES or negated error code, BASE, PC and JGL set.
2146 | addiu DISPATCH, JGL, -GG_DISP2G-32768
2149 | bltz CRET1, >9 // Check for error from exit.
2150 |. lw LFUNC:RB, FRAME_FUNC(BASE)
2151 | lui TMP3, 0x59c0 // TOBIT = 2^52 + 2^51 (float).
2152 | sll MULTRES, CRET1, 3
2153 | li TISNIL, LJ_TNIL
2154 | sw MULTRES, SAVE_MULTRES
2156 | lw TMP1, LFUNC:RB->pc
2157 | sw r0, DISPATCH_GL(jit_base)(DISPATCH)
2158 | lw KBASE, PC2PROTO(k)(TMP1)
2159 | cvt.d.s TOBIT, TOBIT
2160 | // Modified copy of ins_next which handles function header dispatch, too.
2163 | // Assumes TISNIL == ~LJ_VMST_INTERP == -1
2164 | sw TISNIL, DISPATCH_GL(vmstate)(DISPATCH)
2165 | decode_OP4a TMP1, INS
2167 | sltiu TMP2, TMP1, BC_FUNCF*4 // Function header?
2168 | addu TMP0, DISPATCH, TMP1
2169 | decode_RD8a RD, INS
2171 | decode_RA8a RA, INS
2177 | sltiu TMP2, TMP1, (BC_FUNCC+2)*4 // Fast function?
2179 |. lw TMP1, FRAME_PC(BASE)
2180 | // Check frame below fast function.
2181 | andi TMP0, TMP1, FRAME_TYPE
2182 | bnez TMP0, >3 // Trace stitching continuation?
2184 | // Otherwise set KBASE for Lua function below fast function.
2186 | decode_RA8a TMP0, TMP2
2188 | subu TMP1, BASE, TMP0
2189 | lw LFUNC:TMP2, -8+FRAME_FUNC(TMP1)
2190 | lw TMP1, LFUNC:TMP2->pc
2191 | lw KBASE, PC2PROTO(k)(TMP1)
2193 | addiu RC, MULTRES, -8
2195 |. addu RA, RA, BASE
2197 |9: // Rethrow error from the right C frame.
2198 | load_got lj_err_throw
2200 | call_intern lj_err_throw // (lua_State *L, int errcode)
2204 |//-----------------------------------------------------------------------
2205 |//-- Math helper functions ----------------------------------------------
2206 |//-----------------------------------------------------------------------
2208 |// Modifies AT, TMP0, FRET1, FRET2, f4. Keeps all others incl. FARG1.
2209 |.macro vm_round, func
2210 | lui TMP0, 0x4330 // Hiword of 2^52 (double).
2213 | abs.d FRET2, FARG1 // |x|
2215 | c.olt.d 0, FRET2, f4
2216 | add.d FRET1, FRET2, f4 // (|x| + 2^52) - 2^52
2217 | bc1f 0, >1 // Truncate only if |x| < 2^52.
2218 |. sub.d FRET1, FRET1, f4
2220 |.if "func" == "ceil"
2221 | lui TMP0, 0xbff0 // Hiword of -1 (double). Preserves -0.
2223 | lui TMP0, 0x3ff0 // Hiword of +1 (double).
2225 |.if "func" == "trunc"
2227 | c.olt.d 0, FRET2, FRET1 // |x| < result?
2228 | sub.d FRET2, FRET1, f4
2229 | movt.d FRET1, FRET2, 0 // If yes, subtract +1.
2230 | neg.d FRET2, FRET1
2232 |. movn.d FRET1, FRET2, AT // Merge sign bit back in.
2234 | neg.d FRET2, FRET1
2236 | movn.d FRET1, FRET2, AT // Merge sign bit back in.
2237 |.if "func" == "ceil"
2238 | c.olt.d 0, FRET1, FARG1 // x > result?
2240 | c.olt.d 0, FARG1, FRET1 // x < result?
2242 | sub.d FRET2, FRET1, f4 // If yes, subtract +-1.
2244 |. movt.d FRET1, FRET2, 0
2248 |. mov.d FRET1, FARG1
2260 |//-----------------------------------------------------------------------
2261 |//-- Miscellaneous functions --------------------------------------------
2262 |//-----------------------------------------------------------------------
2264 |//-----------------------------------------------------------------------
2265 |//-- FFI helper functions -----------------------------------------------
2266 |//-----------------------------------------------------------------------
2268 |// Handler for callback functions. Callback slot number in r1, g in r2.
2271 |.type CTSTATE, CTState, PC
2273 | lw CTSTATE, GL:r2->ctype_state
2274 | addiu DISPATCH, r2, GG_G2DISP
2275 | load_got lj_ccallback_enter
2276 | sw r1, CTSTATE->cb.slot
2277 | sw CARG1, CTSTATE->cb.gpr[0]
2278 | sw CARG2, CTSTATE->cb.gpr[1]
2279 | sdc1 FARG1, CTSTATE->cb.fpr[0]
2280 | sw CARG3, CTSTATE->cb.gpr[2]
2281 | sw CARG4, CTSTATE->cb.gpr[3]
2282 | sdc1 FARG2, CTSTATE->cb.fpr[1]
2283 | addiu TMP0, sp, CFRAME_SPACE+16
2284 | sw TMP0, CTSTATE->cb.stack
2285 | sw r0, SAVE_PC // Any value outside of bytecode is ok.
2287 | call_intern lj_ccallback_enter // (CTState *cts, void *cf)
2288 |. move CARG1, CTSTATE
2289 | // Returns lua_State *.
2290 | lw BASE, L:CRET1->base
2291 | lw RC, L:CRET1->top
2293 | lui TMP3, 0x59c0 // TOBIT = 2^52 + 2^51 (float).
2294 | lw LFUNC:RB, FRAME_FUNC(BASE)
2297 | li TISNIL, LJ_TNIL
2300 | cvt.d.s TOBIT, TOBIT
2304 |->cont_ffi_callback: // Return from FFI callback.
2306 | load_got lj_ccallback_leave
2307 | lw CTSTATE, DISPATCH_GL(ctype_state)(DISPATCH)
2312 | call_intern lj_ccallback_leave // (CTState *cts, TValue *o)
2313 |. move CARG1, CTSTATE
2314 | lw CRET1, CTSTATE->cb.gpr[0]
2315 | ldc1 FRET1, CTSTATE->cb.fpr[0]
2316 | lw CRET2, CTSTATE->cb.gpr[1]
2318 |. ldc1 FRET2, CTSTATE->cb.fpr[1]
2321 |->vm_ffi_call: // Call C function via FFI.
2322 | // Caveat: needs special frame unwinding, see below.
2324 | .type CCSTATE, CCallState, CARG1
2325 | lw TMP1, CCSTATE->spadj
2326 | lbu CARG2, CCSTATE->nsp
2330 | sll CARG2, CARG2, 2
2332 | sw CCSTATE, -12(TMP2)
2334 | addiu TMP1, CCSTATE, offsetof(CCallState, stack)
2335 | addiu TMP2, sp, 16
2337 |. addu TMP3, TMP1, CARG2
2340 | addiu TMP1, TMP1, 4
2341 | sltu AT, TMP1, TMP3
2344 |. addiu TMP2, TMP2, 4
2346 | lw CFUNCADDR, CCSTATE->func
2347 | lw CARG2, CCSTATE->gpr[1]
2348 | lw CARG3, CCSTATE->gpr[2]
2349 | lw CARG4, CCSTATE->gpr[3]
2350 | ldc1 FARG1, CCSTATE->fpr[0]
2351 | ldc1 FARG2, CCSTATE->fpr[1]
2353 |. lw CARG1, CCSTATE->gpr[0] // Do this last, since CCSTATE is CARG1.
2354 | lw CCSTATE:TMP1, -12(r16)
2357 | sw CRET1, CCSTATE:TMP1->gpr[0]
2358 | sw CRET2, CCSTATE:TMP1->gpr[1]
2359 | sdc1 FRET1, CCSTATE:TMP1->fpr[0]
2360 | sdc1 FRET2, CCSTATE:TMP1->fpr[1]
2365 |// Note: vm_ffi_call must be the last function in this object file!
2367 |//-----------------------------------------------------------------------
2370 /* Generate the code for a single instruction. */
2371 static void build_ins(BuildCtx *ctx, BCOp op, int defop)
2378 /* -- Comparison ops ---------------------------------------------------- */
2380 /* Remember: all ops branch for a true comparison, fall through otherwise. */
2382 case BC_ISLT: case BC_ISGE: case BC_ISLE: case BC_ISGT:
2383 | // RA = src1*8, RD = src2*8, JMP with RD = target
2384 | addu CARG2, BASE, RA
2385 | addu CARG3, BASE, RD
2386 | lw TMP0, HI(CARG2)
2387 | lw TMP1, HI(CARG3)
2390 | sltiu TMP0, TMP0, LJ_TISNUM
2391 | sltiu TMP1, TMP1, LJ_TISNUM
2392 | lhu TMP2, OFS_RD(PC)
2393 | and TMP0, TMP0, TMP1
2395 | beqz TMP0, ->vmeta_comp
2396 |. lui TMP1, (-(BCBIAS_J*4 >> 16) & 65535)
2398 | addu TMP2, TMP2, TMP1
2399 if (op == BC_ISLT || op == BC_ISGE) {
2404 if (op == BC_ISLT || op == BC_ISLE) {
2414 case BC_ISEQV: case BC_ISNEV:
2415 vk = op == BC_ISEQV;
2416 | // RA = src1*8, RD = src2*8, JMP with RD = target
2422 | lhu TMP2, -4+OFS_RD(PC)
2425 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2426 | sltiu AT, TMP0, LJ_TISNUM
2427 | sltiu CARG1, TMP1, LJ_TISNUM
2431 |. addu TMP2, TMP2, TMP3
2441 |5: // Either or both types are not numbers.
2445 | li TMP3, LJ_TCDATA
2446 | beq TMP0, TMP3, ->vmeta_equal_cd
2448 |. sltiu AT, TMP0, LJ_TISPRI // Not a primitive?
2450 | beq TMP1, TMP3, ->vmeta_equal_cd
2452 |. xor TMP3, CARG2, CARG3 // Same tv?
2453 | xor TMP1, TMP1, TMP0 // Same type?
2454 | sltiu CARG1, TMP0, LJ_TISTABUD+1 // Table or userdata?
2455 | movz TMP3, r0, AT // Ignore tv if primitive.
2456 | movn CARG1, r0, TMP1 // Tab/ud and same type?
2457 | or AT, TMP1, TMP3 // Same type && (pri||same tv).
2458 | movz CARG1, r0, AT
2459 | beqz CARG1, <1 // Done if not tab/ud or not same type or same tv.
2461 |. movn TMP2, r0, AT
2463 |. movz TMP2, r0, AT
2465 | // Different tables or userdatas. Need to check __eq metamethod.
2466 | // Field metatable must be at same offset for GCtab and GCudata!
2467 | lw TAB:TMP1, TAB:CARG2->metatable
2468 | beqz TAB:TMP1, <1 // No metatable?
2470 | lbu TMP1, TAB:TMP1->nomm
2471 | andi TMP1, TMP1, 1<<MM_eq
2472 | bnez TMP1, <1 // Or 'no __eq' flag set?
2474 | b ->vmeta_equal // Handle __eq metamethod.
2475 |. li CARG4, 1-vk // ne = 0 or 1.
2478 case BC_ISEQS: case BC_ISNES:
2479 vk = op == BC_ISEQS;
2480 | // RA = src*8, RD = str_const*8 (~), JMP with RD = target
2485 | lw STR:TMP3, LO(RA)
2486 | subu RD, KBASE, RD
2487 | lhu TMP2, -4+OFS_RD(PC)
2490 | beq TMP0, AT, ->vmeta_equal_cd
2492 |. lw STR:TMP1, -4(RD) // KBASE-4-str_const*4
2493 | addiu TMP0, TMP0, -LJ_TSTR
2495 | xor TMP1, STR:TMP1, STR:TMP3
2496 | or TMP0, TMP0, TMP1
2497 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2498 | addu TMP2, TMP2, TMP3
2500 | movn TMP2, r0, TMP0
2502 | movz TMP2, r0, TMP0
2508 case BC_ISEQN: case BC_ISNEN:
2509 vk = op == BC_ISEQN;
2510 | // RA = src*8, RD = num_const*8, JMP with RD = target
2515 | addu RD, KBASE, RD
2516 | lhu TMP2, -4+OFS_RD(PC)
2518 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2519 | sltiu AT, TMP0, LJ_TISNUM
2526 |. addu TMP2, TMP2, TMP3
2541 | beq TMP0, AT, ->vmeta_equal_cd
2548 case BC_ISEQP: case BC_ISNEP:
2549 vk = op == BC_ISEQP;
2550 | // RA = src*8, RD = primitive_type*8 (~), JMP with RD = target
2554 | lhu TMP2, OFS_RD(PC)
2559 | beq TMP0, AT, ->vmeta_equal_cd
2561 |. xor TMP0, TMP0, TMP1
2563 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2564 | addu TMP2, TMP2, TMP3
2566 | movn TMP2, r0, TMP0
2568 | movz TMP2, r0, TMP0
2574 /* -- Unary test and copy ops ------------------------------------------- */
2576 case BC_ISTC: case BC_ISFC: case BC_IST: case BC_ISF:
2577 | // RA = dst*8 or unused, RD = src*8, JMP with RD = target
2579 | lhu TMP2, OFS_RD(PC)
2582 if (op == BC_IST || op == BC_ISF) {
2583 | sltiu TMP0, TMP0, LJ_TISTRUECOND
2585 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2586 | addu TMP2, TMP2, TMP3
2588 | movz TMP2, r0, TMP0
2590 | movn TMP2, r0, TMP0
2594 | sltiu TMP0, TMP0, LJ_TISTRUECOND
2596 if (op == BC_ISTC) {
2601 |. addu RA, BASE, RA
2603 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
2604 | addu TMP2, TMP2, TMP3
2613 | // RA = src*8, RD = -type*8
2614 | addu TMP2, BASE, RA
2618 | addu AT, TMP0, TMP1
2619 | bnez AT, ->vmeta_istype
2623 | // RA = src*8, RD = -(TISNUM-1)*8
2624 | addu TMP2, BASE, RA
2627 | sltiu AT, TMP0, LJ_TISNUM
2628 | beqz AT, ->vmeta_istype
2632 /* -- Unary ops --------------------------------------------------------- */
2635 | // RA = dst*8, RD = src*8
2644 | // RA = dst*8, RD = src*8
2648 | li TMP1, LJ_TFALSE
2649 | sltiu TMP0, TMP0, LJ_TISTRUECOND
2650 | addiu TMP1, TMP0, LJ_TTRUE
2656 | // RA = dst*8, RD = src*8
2657 | addu CARG3, BASE, RD
2659 | lw TMP0, HI(CARG3)
2661 | sltiu AT, TMP0, LJ_TISNUM
2662 | beqz AT, ->vmeta_unm
2669 | // RA = dst*8, RD = src*8
2670 | addu CARG2, BASE, RD
2672 | lw TMP0, HI(CARG2)
2673 | lw CARG1, LO(CARG2)
2677 | lw CRET1, STR:CARG1->len
2685 | bne TMP0, AT, ->vmeta_len
2688 | lw TAB:TMP2, TAB:CARG1->metatable
2694 | load_got lj_tab_len
2695 | call_intern lj_tab_len // (GCtab *t)
2697 | // Returns uint32_t (but less than 2^31).
2702 | lbu TMP0, TAB:TMP2->nomm
2703 | andi TMP0, TMP0, 1<<MM_len
2704 | bnez TMP0, <3 // 'no __len' flag set: done.
2711 /* -- Binary ops -------------------------------------------------------- */
2713 |.macro ins_arithpre
2714 ||vk = ((int)op - BC_ADDVN) / (BC_ADDNV-BC_ADDVN);
2715 | decode_RB8a RB, INS
2717 | decode_RDtoRC8 RC, RD
2718 | // RA = dst*8, RB = src1*8, RC = src2*8 | num_const*8
2721 | addu CARG3, BASE, RB
2722 | addu CARG4, KBASE, RC
2723 | lw TMP1, HI(CARG3)
2724 | ldc1 f20, 0(CARG3)
2725 | ldc1 f22, 0(CARG4)
2726 | sltiu AT, TMP1, LJ_TISNUM
2729 | addu CARG4, BASE, RB
2730 | addu CARG3, KBASE, RC
2731 | lw TMP1, HI(CARG4)
2732 | ldc1 f22, 0(CARG4)
2733 | ldc1 f20, 0(CARG3)
2734 | sltiu AT, TMP1, LJ_TISNUM
2737 | addu CARG3, BASE, RB
2738 | addu CARG4, BASE, RC
2739 | lw TMP1, HI(CARG3)
2740 | lw TMP2, HI(CARG4)
2741 | ldc1 f20, 0(CARG3)
2742 | ldc1 f22, 0(CARG4)
2743 | sltiu AT, TMP1, LJ_TISNUM
2744 | sltiu TMP0, TMP2, LJ_TISNUM
2748 | beqz AT, ->vmeta_arith
2749 |. addu RA, BASE, RA
2752 |.macro fpmod, a, b, c
2754 | bal ->vm_floor // floor(b/c)
2755 |. div.d FARG1, b, c
2757 | sub.d a, b, a // b - floor(b/c)*c
2760 |.macro ins_arith, ins
2762 |.if "ins" == "fpmod_"
2763 | b ->BC_MODVN_Z // Avoid 3 copies. It's slow anyway.
2773 case BC_ADDVN: case BC_ADDNV: case BC_ADDVV:
2776 case BC_SUBVN: case BC_SUBNV: case BC_SUBVV:
2779 case BC_MULVN: case BC_MULNV: case BC_MULVV:
2782 case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
2788 case BC_MODNV: case BC_MODVV:
2792 | decode_RB8a RB, INS
2794 | decode_RDtoRC8 RC, RD
2795 | addu CARG3, BASE, RB
2796 | addu CARG4, BASE, RC
2797 | lw TMP1, HI(CARG3)
2798 | lw TMP2, HI(CARG4)
2799 | ldc1 FARG1, 0(CARG3)
2800 | ldc1 FARG2, 0(CARG4)
2801 | sltiu AT, TMP1, LJ_TISNUM
2802 | sltiu TMP0, TMP2, LJ_TISNUM
2805 | beqz AT, ->vmeta_arith
2806 |. addu RA, BASE, RA
2815 | // RA = dst*8, RB = src_start*8, RC = src_end*8
2816 | decode_RB8a RB, INS
2818 | decode_RDtoRC8 RC, RD
2819 | subu CARG3, RC, RB
2821 | addu CARG2, BASE, RC
2824 | load_got lj_meta_cat
2825 | srl CARG3, CARG3, 3
2827 | call_intern lj_meta_cat // (lua_State *L, TValue *top, int left)
2829 | // Returns NULL (finished) or TValue * (metamethod).
2830 | bnez CRET1, ->vmeta_binop
2832 | addu RB, BASE, MULTRES
2836 | sdc1 f0, 0(RA) // Copy result from RB to RA.
2840 /* -- Constant ops ------------------------------------------------------ */
2843 | // RA = dst*8, RD = str_const*8 (~)
2845 | subu TMP1, KBASE, TMP1
2847 | lw TMP0, -4(TMP1) // KBASE-4-str_const*4
2856 | // RA = dst*8, RD = cdata_const*8 (~)
2858 | subu TMP1, KBASE, TMP1
2860 | lw TMP0, -4(TMP1) // KBASE-4-cdata_const*4
2862 | li TMP2, LJ_TCDATA
2869 | // RA = dst*8, RD = int16_literal*8
2879 | // RA = dst*8, RD = num_const*8
2880 | addu RD, KBASE, RD
2888 | // RA = dst*8, RD = primitive_type*8 (~)
2897 | // RA = base*8, RD = end*8
2910 /* -- Upvalue and function ops ------------------------------------------ */
2913 | // RA = dst*8, RD = uvnum*8
2914 | lw LFUNC:RB, FRAME_FUNC(BASE)
2916 | addu RD, RD, LFUNC:RB
2917 | lw UPVAL:RB, LFUNC:RD->uvptr
2919 | lw TMP1, UPVAL:RB->v
2926 | // RA = uvnum*8, RD = src*8
2927 | lw LFUNC:RB, FRAME_FUNC(BASE)
2930 | addu RA, RA, LFUNC:RB
2932 | lw UPVAL:RB, LFUNC:RA->uvptr
2933 | lbu TMP3, UPVAL:RB->marked
2934 | lw CARG2, UPVAL:RB->v
2935 | andi TMP3, TMP3, LJ_GC_BLACK // isblack(uv)
2936 | lbu TMP0, UPVAL:RB->closed
2939 | li AT, LJ_GC_BLACK|1
2940 | or TMP3, TMP3, TMP0
2941 | beq TMP3, AT, >2 // Upvalue is closed and black?
2942 |. addiu TMP2, TMP2, -(LJ_TNUMX+1)
2946 |2: // Check if new value is collectable.
2947 | sltiu AT, TMP2, LJ_TISGCV - (LJ_TNUMX+1)
2948 | beqz AT, <1 // tvisgcv(v)
2950 | lbu TMP3, GCOBJ:TMP1->gch.marked
2951 | andi TMP3, TMP3, LJ_GC_WHITES // iswhite(v)
2953 |. load_got lj_gc_barrieruv
2954 | // Crossed a write barrier. Move the barrier forward.
2955 | call_intern lj_gc_barrieruv // (global_State *g, TValue *tv)
2956 |. addiu CARG1, DISPATCH, GG_DISP2G
2961 | // RA = uvnum*8, RD = str_const*8 (~)
2962 | lw LFUNC:RB, FRAME_FUNC(BASE)
2965 | addu RA, RA, LFUNC:RB
2966 | subu TMP1, KBASE, TMP1
2967 | lw UPVAL:RB, LFUNC:RA->uvptr
2968 | lw STR:TMP1, -4(TMP1) // KBASE-4-str_const*4
2969 | lbu TMP2, UPVAL:RB->marked
2970 | lw CARG2, UPVAL:RB->v
2971 | lbu TMP3, STR:TMP1->marked
2972 | andi AT, TMP2, LJ_GC_BLACK // isblack(uv)
2973 | lbu TMP2, UPVAL:RB->closed
2975 | sw STR:TMP1, LO(CARG2)
2977 |. sw TMP0, HI(CARG2)
2981 |2: // Check if string is white and ensure upvalue is closed.
2983 |. andi AT, TMP3, LJ_GC_WHITES // iswhite(str)
2985 |. load_got lj_gc_barrieruv
2986 | // Crossed a write barrier. Move the barrier forward.
2987 | call_intern lj_gc_barrieruv // (global_State *g, TValue *tv)
2988 |. addiu CARG1, DISPATCH, GG_DISP2G
2993 | // RA = uvnum*8, RD = num_const*8
2994 | lw LFUNC:RB, FRAME_FUNC(BASE)
2996 | addu RD, KBASE, RD
2997 | addu RA, RA, LFUNC:RB
2999 | lw UPVAL:RB, LFUNC:RA->uvptr
3001 | lw TMP1, UPVAL:RB->v
3006 | // RA = uvnum*8, RD = primitive_type*8 (~)
3007 | lw LFUNC:RB, FRAME_FUNC(BASE)
3010 | addu RA, RA, LFUNC:RB
3012 | lw UPVAL:RB, LFUNC:RA->uvptr
3014 | lw TMP1, UPVAL:RB->v
3020 | // RA = level*8, RD = target
3021 | lw TMP2, L->openupval
3022 | branch_RD // Do this first since RD is not saved.
3023 | load_got lj_func_closeuv
3027 | call_intern lj_func_closeuv // (lua_State *L, TValue *level)
3028 |. addu CARG2, BASE, RA
3035 | // RA = dst*8, RD = proto_const*8 (~) (holding function prototype)
3037 | load_got lj_func_newL_gc
3038 | subu TMP1, KBASE, TMP1
3039 | lw CARG3, FRAME_FUNC(BASE)
3040 | lw CARG2, -4(TMP1) // KBASE-4-tab_const*4
3043 | // (lua_State *L, GCproto *pt, GCfuncL *parent)
3044 | call_intern lj_func_newL_gc
3046 | // Returns GCfuncL *.
3052 | sw LFUNC:CRET1, LO(RA)
3056 /* -- Table ops --------------------------------------------------------- */
3060 | // RA = dst*8, RD = (hbits|asize)*8 | tab_const*8 (~)
3061 | lw TMP0, DISPATCH_GL(gc.total)(DISPATCH)
3062 | lw TMP1, DISPATCH_GL(gc.threshold)(DISPATCH)
3065 | sltu AT, TMP0, TMP1
3068 if (op == BC_TNEW) {
3069 | load_got lj_tab_new
3071 | andi CARG2, CARG2, 0x7ff
3073 | addiu AT, CARG2, -0x7ff
3075 | movz CARG2, TMP0, AT
3076 | // (lua_State *L, int32_t asize, uint32_t hbits)
3077 | call_intern lj_tab_new
3079 | // Returns Table *.
3081 | load_got lj_tab_dup
3083 | subu TMP1, KBASE, TMP1
3085 | call_intern lj_tab_dup // (lua_State *L, Table *kt)
3086 |. lw CARG2, -4(TMP1) // KBASE-4-str_const*4
3087 | // Returns Table *.
3093 | sw TAB:CRET1, LO(RA)
3097 | load_got lj_gc_step_fixtop
3099 | call_intern lj_gc_step_fixtop // (lua_State *L)
3106 | // RA = dst*8, RD = str_const*8 (~)
3108 | // RA = src*8, RD = str_const*8 (~)
3109 | lw LFUNC:TMP2, FRAME_FUNC(BASE)
3111 | subu TMP1, KBASE, TMP1
3112 | lw TAB:RB, LFUNC:TMP2->env
3113 | lw STR:RC, -4(TMP1) // KBASE-4-str_const*4
3114 if (op == BC_GGET) {
3119 |. addu RA, BASE, RA
3123 | // RA = dst*8, RB = table*8, RC = key*8
3124 | decode_RB8a RB, INS
3126 | decode_RDtoRC8 RC, RD
3127 | addu CARG2, BASE, RB
3128 | addu CARG3, BASE, RC
3129 | lw TMP1, HI(CARG2)
3130 | lw TMP2, HI(CARG3)
3131 | lw TAB:RB, LO(CARG2)
3134 | bne TMP1, AT, ->vmeta_tgetv
3135 |. addu RA, BASE, RA
3136 | sltiu AT, TMP2, LJ_TISNUM
3140 | // Convert number key to integer, check for integerness and range.
3142 | lw TMP0, TAB:RB->asize
3145 | lw TMP1, TAB:RB->array
3147 | sltu AT, TMP2, TMP0
3150 | beqz AT, ->vmeta_tgetv // Integer key and in array part?
3151 |. addu TMP2, TMP1, TMP2
3153 | beq TMP0, TISNIL, >2
3160 |2: // Check for __index if table value is nil.
3161 | lw TAB:TMP2, TAB:RB->metatable
3162 | beqz TAB:TMP2, <1 // No metatable: done.
3164 | lbu TMP0, TAB:TMP2->nomm
3165 | andi TMP0, TMP0, 1<<MM_index
3166 | bnez TMP0, <1 // 'no __index' flag set: done.
3172 | bne TMP2, AT, ->vmeta_tgetv
3173 |. lw STR:RC, LO(CARG3)
3174 | b ->BC_TGETS_Z // String key?
3178 | // RA = dst*8, RB = table*8, RC = str_const*4 (~)
3179 | decode_RB8a RB, INS
3181 | addu CARG2, BASE, RB
3182 | decode_RC4a RC, INS
3183 | lw TMP0, HI(CARG2)
3186 | lw TAB:RB, LO(CARG2)
3187 | subu CARG3, KBASE, RC
3188 | lw STR:RC, -4(CARG3) // KBASE-4-str_const*4
3189 | bne TMP0, AT, ->vmeta_tgets1
3190 |. addu RA, BASE, RA
3192 | // TAB:RB = GCtab *, STR:RC = GCstr *, RA = dst*8
3193 | lw TMP0, TAB:RB->hmask
3194 | lw TMP1, STR:RC->hash
3195 | lw NODE:TMP2, TAB:RB->node
3196 | and TMP1, TMP1, TMP0 // idx = str->hash & tab->hmask
3199 | subu TMP1, TMP0, TMP1
3200 | addu NODE:TMP2, NODE:TMP2, TMP1 // node = tab->node + (idx*32-idx*8)
3202 | lw CARG1, offsetof(Node, key)+HI(NODE:TMP2)
3203 | lw TMP0, offsetof(Node, key)+LO(NODE:TMP2)
3204 | lw NODE:TMP1, NODE:TMP2->next
3205 | lw CARG2, offsetof(Node, val)+HI(NODE:TMP2)
3206 | addiu CARG1, CARG1, -LJ_TSTR
3207 | xor TMP0, TMP0, STR:RC
3208 | or AT, CARG1, TMP0
3210 |. lw TAB:TMP3, TAB:RB->metatable
3211 | beq CARG2, TISNIL, >5 // Key found, but nil value?
3212 |. lw CARG1, offsetof(Node, val)+LO(NODE:TMP2)
3219 |4: // Follow hash chain.
3220 | bnez NODE:TMP1, <1
3221 |. move NODE:TMP2, NODE:TMP1
3222 | // End of hash chain: key not found, nil result.
3224 |5: // Check for __index if table value is nil.
3225 | beqz TAB:TMP3, <3 // No metatable: done.
3226 |. li CARG2, LJ_TNIL
3227 | lbu TMP0, TAB:TMP3->nomm
3228 | andi TMP0, TMP0, 1<<MM_index
3229 | bnez TMP0, <3 // 'no __index' flag set: done.
3235 | // RA = dst*8, RB = table*8, RC = index*8
3236 | decode_RB8a RB, INS
3238 | addu CARG2, BASE, RB
3239 | decode_RDtoRC8 RC, RD
3240 | lw CARG1, HI(CARG2)
3242 | lw TAB:RB, LO(CARG2)
3244 | bne CARG1, AT, ->vmeta_tgetb
3246 | lw TMP1, TAB:RB->asize
3247 | lw TMP2, TAB:RB->array
3248 | sltu AT, TMP0, TMP1
3249 | beqz AT, ->vmeta_tgetb
3250 |. addu RC, TMP2, RC
3252 | beq TMP1, TISNIL, >5
3259 |5: // Check for __index if table value is nil.
3260 | lw TAB:TMP2, TAB:RB->metatable
3261 | beqz TAB:TMP2, <1 // No metatable: done.
3263 | lbu TMP1, TAB:TMP2->nomm
3264 | andi TMP1, TMP1, 1<<MM_index
3265 | bnez TMP1, <1 // 'no __index' flag set: done.
3267 | b ->vmeta_tgetb // Caveat: preserve TMP0!
3271 | // RA = dst*8, RB = table*8, RC = key*8
3272 | decode_RB8a RB, INS
3274 | decode_RDtoRC8 RC, RD
3275 | addu CARG2, BASE, RB
3276 | addu CARG3, BASE, RC
3277 | lw TAB:CARG1, LO(CARG2)
3280 | lw TMP0, TAB:CARG1->asize
3282 | lw TMP1, TAB:CARG1->array
3283 | sltu AT, CARG2, TMP0
3284 | sll TMP2, CARG2, 3
3285 | beqz AT, ->vmeta_tgetr // In array part?
3286 |. addu TMP2, TMP1, TMP2
3296 | // RA = src*8, RB = table*8, RC = key*8
3297 | decode_RB8a RB, INS
3299 | decode_RDtoRC8 RC, RD
3300 | addu CARG2, BASE, RB
3301 | addu CARG3, BASE, RC
3302 | lw TMP1, HI(CARG2)
3303 | lw TMP2, HI(CARG3)
3304 | lw TAB:RB, LO(CARG2)
3307 | bne TMP1, AT, ->vmeta_tsetv
3308 |. addu RA, BASE, RA
3309 | sltiu AT, TMP2, LJ_TISNUM
3313 | // Convert number key to integer, check for integerness and range.
3315 | lw TMP0, TAB:RB->asize
3318 | lw TMP1, TAB:RB->array
3320 | sltu AT, TMP2, TMP0
3323 | beqz AT, ->vmeta_tsetv // Integer key and in array part?
3324 |. addu TMP1, TMP1, TMP2
3325 | lbu TMP3, TAB:RB->marked
3327 | beq TMP0, TISNIL, >3
3330 | andi AT, TMP3, LJ_GC_BLACK // isblack(table)
3336 |3: // Check for __newindex if previous value is nil.
3337 | lw TAB:TMP2, TAB:RB->metatable
3338 | beqz TAB:TMP2, <1 // No metatable: done.
3340 | lbu TMP2, TAB:TMP2->nomm
3341 | andi TMP2, TMP2, 1<<MM_newindex
3342 | bnez TMP2, <1 // 'no __newindex' flag set: done.
3348 | bne TMP2, AT, ->vmeta_tsetv
3349 |. lw STR:RC, LO(CARG3)
3350 | b ->BC_TSETS_Z // String key?
3353 |7: // Possible table write barrier for the value. Skip valiswhite check.
3354 | barrierback TAB:RB, TMP3, TMP0, <2
3357 | // RA = src*8, RB = table*8, RC = str_const*8 (~)
3358 | decode_RB8a RB, INS
3360 | addu CARG2, BASE, RB
3361 | decode_RC4a RC, INS
3362 | lw TMP0, HI(CARG2)
3365 | subu CARG3, KBASE, RC
3366 | lw TAB:RB, LO(CARG2)
3367 | lw STR:RC, -4(CARG3) // KBASE-4-str_const*4
3368 | bne TMP0, AT, ->vmeta_tsets1
3369 |. addu RA, BASE, RA
3371 | // TAB:RB = GCtab *, STR:RC = GCstr *, RA = BASE+src*8
3372 | lw TMP0, TAB:RB->hmask
3373 | lw TMP1, STR:RC->hash
3374 | lw NODE:TMP2, TAB:RB->node
3375 | sb r0, TAB:RB->nomm // Clear metamethod cache.
3376 | and TMP1, TMP1, TMP0 // idx = str->hash & tab->hmask
3379 | subu TMP1, TMP0, TMP1
3380 | addu NODE:TMP2, NODE:TMP2, TMP1 // node = tab->node + (idx*32-idx*8)
3383 | lw CARG1, offsetof(Node, key)+HI(NODE:TMP2)
3384 | lw TMP0, offsetof(Node, key)+LO(NODE:TMP2)
3386 | lw NODE:TMP1, NODE:TMP2->next
3388 |. lw CARG2, offsetof(Node, val)+HI(NODE:TMP2)
3389 | bne TMP0, STR:RC, >5
3390 |. lbu TMP3, TAB:RB->marked
3391 | beq CARG2, TISNIL, >4 // Key found, but nil value?
3392 |. lw TAB:TMP0, TAB:RB->metatable
3394 | andi AT, TMP3, LJ_GC_BLACK // isblack(table)
3396 |. sdc1 f20, NODE:TMP2->val
3400 |4: // Check for __newindex if previous value is nil.
3401 | beqz TAB:TMP0, <2 // No metatable: done.
3403 | lbu TMP0, TAB:TMP0->nomm
3404 | andi TMP0, TMP0, 1<<MM_newindex
3405 | bnez TMP0, <2 // 'no __newindex' flag set: done.
3410 |5: // Follow hash chain.
3411 | bnez NODE:TMP1, <1
3412 |. move NODE:TMP2, NODE:TMP1
3413 | // End of hash chain: key not found, add a new one
3415 | // But check for __newindex first.
3416 | lw TAB:TMP2, TAB:RB->metatable
3417 | beqz TAB:TMP2, >6 // No metatable: continue.
3418 |. addiu CARG3, DISPATCH, DISPATCH_GL(tmptv)
3419 | lbu TMP0, TAB:TMP2->nomm
3420 | andi TMP0, TMP0, 1<<MM_newindex
3421 | beqz TMP0, ->vmeta_tsets // 'no __newindex' flag NOT set: check.
3424 | load_got lj_tab_newkey
3425 | sw STR:RC, LO(CARG3)
3428 | move CARG2, TAB:RB
3430 | call_intern lj_tab_newkey // (lua_State *L, GCtab *t, TValue *k
3432 | // Returns TValue *.
3434 | b <3 // No 2nd write barrier needed.
3435 |. sdc1 f20, 0(CRET1)
3437 |7: // Possible table write barrier for the value. Skip valiswhite check.
3438 | barrierback TAB:RB, TMP3, TMP0, <3
3441 | // RA = src*8, RB = table*8, RC = index*8
3442 | decode_RB8a RB, INS
3444 | addu CARG2, BASE, RB
3445 | decode_RDtoRC8 RC, RD
3446 | lw CARG1, HI(CARG2)
3448 | lw TAB:RB, LO(CARG2)
3450 | bne CARG1, AT, ->vmeta_tsetb
3452 | lw TMP1, TAB:RB->asize
3453 | lw TMP2, TAB:RB->array
3454 | sltu AT, TMP0, TMP1
3455 | beqz AT, ->vmeta_tsetb
3456 |. addu RC, TMP2, RC
3458 | lbu TMP3, TAB:RB->marked
3459 | beq TMP1, TISNIL, >5
3462 | andi AT, TMP3, LJ_GC_BLACK // isblack(table)
3468 |5: // Check for __newindex if previous value is nil.
3469 | lw TAB:TMP2, TAB:RB->metatable
3470 | beqz TAB:TMP2, <1 // No metatable: done.
3472 | lbu TMP1, TAB:TMP2->nomm
3473 | andi TMP1, TMP1, 1<<MM_newindex
3474 | bnez TMP1, <1 // 'no __newindex' flag set: done.
3476 | b ->vmeta_tsetb // Caveat: preserve TMP0!
3479 |7: // Possible table write barrier for the value. Skip valiswhite check.
3480 | barrierback TAB:RB, TMP3, TMP0, <2
3483 | // RA = dst*8, RB = table*8, RC = key*8
3484 | decode_RB8a RB, INS
3486 | decode_RDtoRC8 RC, RD
3487 | addu CARG1, BASE, RB
3488 | addu CARG3, BASE, RC
3489 | lw TAB:CARG2, LO(CARG1)
3492 | lbu TMP3, TAB:CARG2->marked
3493 | lw TMP0, TAB:CARG2->asize
3495 | lw TMP1, TAB:CARG2->array
3496 | andi AT, TMP3, LJ_GC_BLACK // isblack(table)
3498 |. addu RA, BASE, RA
3500 | sltu AT, CARG3, TMP0
3501 | sll TMP2, CARG3, 3
3502 | beqz AT, ->vmeta_tsetr // In array part?
3504 | addu CRET1, TMP1, TMP2
3507 | sdc1 f20, 0(CRET1)
3510 |7: // Possible table write barrier for the value. Skip valiswhite check.
3511 | barrierback TAB:RB, TMP3, TMP0, <2
3516 | // RA = base*8 (table at base-1), RD = num_const*8 (start index)
3519 | addu TMP3, KBASE, RD
3520 | lw TAB:CARG2, -8+LO(RA) // Guaranteed to be a table.
3521 | addiu TMP0, MULTRES, -8
3522 | lw TMP3, LO(TMP3) // Integer constant is in lo-word.
3523 | beqz TMP0, >4 // Nothing to copy?
3524 |. srl CARG3, TMP0, 3
3525 | addu CARG3, CARG3, TMP3
3526 | lw TMP2, TAB:CARG2->asize
3528 | lbu TMP3, TAB:CARG2->marked
3529 | lw CARG1, TAB:CARG2->array
3530 | sltu AT, TMP2, CARG3
3532 |. addu TMP2, RA, TMP0
3533 | addu TMP1, TMP1, CARG1
3534 | andi TMP0, TMP3, LJ_GC_BLACK // isblack(table)
3535 |3: // Copy result slots to table.
3541 |. addiu TMP1, TMP1, 8
3547 |5: // Need to resize array part.
3548 | load_got lj_tab_reasize
3552 | call_intern lj_tab_reasize // (lua_State *L, GCtab *t, int nasize)
3554 | // Must not reallocate the stack.
3557 |. lw BASE, L->base // Reload BASE for lack of a saved register.
3559 |7: // Possible table write barrier for any value. Skip valiswhite check.
3560 | barrierback TAB:CARG2, TMP3, TMP0, <4
3563 /* -- Calls and vararg handling ----------------------------------------- */
3566 | // RA = base*8, (RB = (nresults+1)*8,) RC = extra_nargs*8
3567 | decode_RDtoRC8 NARGS8:RC, RD
3569 |. addu NARGS8:RC, NARGS8:RC, MULTRES
3572 | // RA = base*8, (RB = (nresults+1)*8,) RC = (nargs+1)*8
3573 | decode_RDtoRC8 NARGS8:RC, RD
3576 | addu BASE, BASE, RA
3579 | lw LFUNC:RB, LO(BASE)
3580 | addiu BASE, BASE, 8
3581 | bne TMP0, AT, ->vmeta_call
3582 |. addiu NARGS8:RC, NARGS8:RC, -8
3587 | // RA = base*8, (RB = 0,) RC = extra_nargs*8
3588 | addu NARGS8:RD, NARGS8:RD, MULTRES // BC_CALLT gets RC from RD.
3589 | // Fall through. Assumes BC_CALLT follows.
3592 | // RA = base*8, (RB = 0,) RC = (nargs+1)*8
3596 | lw LFUNC:RB, LO(RA)
3597 | move NARGS8:RC, RD
3598 | lw TMP1, FRAME_PC(BASE)
3600 | bne TMP0, AT, ->vmeta_callt
3601 |. addiu NARGS8:RC, NARGS8:RC, -8
3603 | andi TMP0, TMP1, FRAME_TYPE // Caveat: preserve TMP0 until the 'or'.
3604 | lbu TMP3, LFUNC:RB->ffid
3606 |. xori TMP2, TMP1, FRAME_VARG
3608 | sw LFUNC:RB, FRAME_FUNC(BASE) // Copy function down, but keep PC.
3609 | sltiu AT, TMP3, 2 // (> FF_C) Calling a fast function?
3611 | beqz NARGS8:RC, >3
3612 |. move TMP3, NARGS8:RC
3616 | addiu TMP3, TMP3, -8
3619 |. addiu TMP2, TMP2, 8
3627 |5: // Tailcall to a fast function with a Lua frame below.
3629 | decode_RA8a RA, INS
3631 | subu TMP1, BASE, RA
3632 | lw LFUNC:TMP1, -8+FRAME_FUNC(TMP1)
3633 | lw TMP1, LFUNC:TMP1->pc
3635 |. lw KBASE, PC2PROTO(k)(TMP1) // Need to prepare KBASE.
3637 |7: // Tailcall from a vararg function.
3638 | andi AT, TMP2, FRAME_TYPEP
3639 | bnez AT, <1 // Vararg frame below?
3640 |. subu TMP2, BASE, TMP2 // Relocate BASE down.
3642 | lw TMP1, FRAME_PC(TMP2)
3644 |. andi TMP0, TMP1, FRAME_TYPE
3648 | // RA = base*8, (RB = (nresults+1)*8, RC = (nargs+1)*8 ((2+1)*8))
3650 | addu BASE, BASE, RA
3652 | lw TMP1, -24+HI(BASE)
3653 | lw LFUNC:RB, -24+LO(BASE)
3655 | ldc1 f0, -16(BASE)
3656 | sw TMP1, HI(BASE) // Copy callable.
3657 | sw LFUNC:RB, LO(BASE)
3658 | sdc1 f2, 16(BASE) // Copy control var.
3659 | sdc1 f0, 8(BASE) // Copy state.
3660 | addiu BASE, BASE, 8
3661 | bne TMP1, AT, ->vmeta_call
3662 |. li NARGS8:RC, 16 // Iterators get 2 arguments.
3667 | // RA = base*8, (RB = (nresults+1)*8, RC = (nargs+1)*8 (2+1)*8)
3669 | // NYI: add hotloop, record BC_ITERN.
3672 | lw TAB:RB, -16+LO(RA)
3673 | lw RC, -8+LO(RA) // Get index from control var.
3674 | lw TMP0, TAB:RB->asize
3675 | lw TMP1, TAB:RB->array
3677 |1: // Traverse array part.
3679 | beqz AT, >5 // Index points after array part?
3681 | addu TMP3, TMP1, TMP3
3685 | lhu RD, -4+OFS_RD(PC)
3686 | beq TMP2, TISNIL, <1 // Skip holes in array part.
3689 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
3693 | sw RC, -8+LO(RA) // Update control var.
3699 |5: // Traverse hash part.
3700 | lw TMP1, TAB:RB->hmask
3702 | lw TMP2, TAB:RB->node
3704 | sltu AT, TMP1, RC // End of iteration? Branch to ITERL+1.
3708 | subu TMP3, TMP3, RB
3709 | addu NODE:TMP3, TMP3, TMP2
3710 | lw RB, HI(NODE:TMP3)
3711 | ldc1 f0, 0(NODE:TMP3)
3712 | lhu RD, -4+OFS_RD(PC)
3713 | beq RB, TISNIL, <6 // Skip holes in hash part.
3715 | ldc1 f2, NODE:TMP3->key
3716 | lui TMP3, (-(BCBIAS_J*4 >> 16) & 65535)
3724 |. sw RC, -8+LO(RA) // Update control var.
3728 | // RA = base*8, RD = target (points to ITERN)
3730 | lw TMP0, -24+HI(RA)
3731 | lw CFUNC:TMP1, -24+LO(RA)
3732 | lw TMP2, -16+HI(RA)
3733 | lw TMP3, -8+HI(RA)
3736 |. addiu TMP2, TMP2, -LJ_TTAB
3737 | lbu TMP1, CFUNC:TMP1->ffid
3738 | addiu TMP3, TMP3, -LJ_TNIL
3740 | or TMP2, TMP2, TMP3
3741 | addiu TMP1, TMP1, -FF_next_N
3742 | addu TMP0, PC, TMP0
3743 | or TMP1, TMP1, TMP2
3745 |. lui TMP2, (-(BCBIAS_J*4 >> 16) & 65535)
3746 | addu PC, TMP0, TMP2
3748 | ori TMP1, TMP1, 0x7fff
3749 | sw r0, -8+LO(RA) // Initialize control var.
3750 | sw TMP1, -8+HI(RA)
3753 |5: // Despecialize bytecode if any of the checks fail.
3756 | sb TMP3, -4+OFS_OP(PC)
3757 | addu PC, TMP0, TMP2
3759 |. sb TMP1, OFS_OP(PC)
3763 | // RA = base*8, RB = (nresults+1)*8, RC = numparams*8
3764 | lw TMP0, FRAME_PC(BASE)
3765 | decode_RDtoRC8 RC, RD
3766 | decode_RB8a RB, INS
3770 | addiu RC, RC, FRAME_VARG
3772 | addiu TMP3, BASE, -8 // TMP3 = vtop
3773 | subu RC, RC, TMP0 // RC = vbase
3774 | // Note: RC may now be even _above_ BASE if nargs was < numparams.
3775 | beqz RB, >5 // Copy all varargs?
3776 |. subu TMP1, TMP3, RC
3777 | addiu TMP2, TMP2, -16
3778 |1: // Copy vararg slots to destination slots.
3783 | movz CARG1, TISNIL, AT
3792 |5: // Copy all varargs.
3793 | lw TMP0, L->maxstack
3794 | blez TMP1, <3 // No vararg slots?
3795 |. li MULTRES, 8 // MULTRES = (0+1)*8
3796 | addu TMP2, RA, TMP1
3797 | sltu AT, TMP0, TMP2
3799 |. addiu MULTRES, TMP1, 8
3805 | bnez AT, <6 // More vararg slots?
3810 |7: // Grow stack for varargs.
3811 | load_got lj_state_growstack
3815 | subu BASE, RC, BASE // Need delta, because BASE may change.
3817 | srl CARG2, TMP1, 3
3818 | call_intern lj_state_growstack // (lua_State *L, int n)
3825 |. addiu TMP3, BASE, -8
3828 /* -- Returns ----------------------------------------------------------- */
3831 | // RA = results*8, RD = extra_nresults*8
3832 | addu RD, RD, MULTRES // MULTRES >= 8, so RD >= 8.
3833 | // Fall through. Assumes BC_RET follows.
3837 | // RA = results*8, RD = (nresults+1)*8
3838 | lw PC, FRAME_PC(BASE)
3842 | andi TMP0, PC, FRAME_TYPE
3843 | bnez TMP0, ->BC_RETV_Z
3844 |. xori TMP1, PC, FRAME_VARG
3847 | // BASE = base, RA = resultptr, RD = (nresults+1)*8, PC = return
3849 | addiu TMP2, BASE, -8
3851 | decode_RA8a TMP0, INS
3852 | decode_RB8a RB, INS
3855 | addu TMP3, TMP2, RB
3857 |. subu BASE, TMP2, TMP0
3864 |. addiu TMP2, TMP2, 8
3866 | addiu TMP3, TMP3, -8
3868 | sltu AT, TMP2, TMP3
3870 |. lw LFUNC:TMP1, FRAME_FUNC(BASE)
3872 | lw TMP1, LFUNC:TMP1->pc
3873 | lw KBASE, PC2PROTO(k)(TMP1)
3876 |6: // Fill up results with nil.
3877 | sw TISNIL, HI(TMP2)
3879 |. addiu TMP2, TMP2, 8
3881 |->BC_RETV_Z: // Non-standard return case.
3882 | andi TMP2, TMP1, FRAME_TYPEP
3883 | bnez TMP2, ->vm_return
3885 | // Return from vararg function: relocate BASE down.
3886 | subu BASE, BASE, TMP1
3888 |. lw PC, FRAME_PC(BASE)
3891 case BC_RET0: case BC_RET1:
3892 | // RA = results*8, RD = (nresults+1)*8
3893 | lw PC, FRAME_PC(BASE)
3896 | andi TMP0, PC, FRAME_TYPE
3897 | bnez TMP0, ->BC_RETV_Z
3898 |. xori TMP1, PC, FRAME_VARG
3901 | addiu TMP2, BASE, -8
3902 if (op == BC_RET1) {
3905 | decode_RB8a RB, INS
3906 | decode_RA8a RA, INS
3909 if (op == BC_RET1) {
3912 | subu BASE, TMP2, RA
3916 |. lw LFUNC:TMP1, FRAME_FUNC(BASE)
3918 | lw TMP1, LFUNC:TMP1->pc
3919 | lw KBASE, PC2PROTO(k)(TMP1)
3922 |6: // Fill up results with nil.
3923 | addiu TMP2, TMP2, 8
3926 if (op == BC_RET1) {
3927 |. sw TISNIL, HI(TMP2)
3929 |. sw TISNIL, -8+HI(TMP2)
3933 /* -- Loops and branches ------------------------------------------------ */
3939 | // Fall through. Assumes BC_IFORL follows.
3949 | // RA = base*8, RD = target (after end of loop or start of loop)
3950 vk = (op == BC_IFORL || op == BC_JFORL);
3953 | ldc1 f0, FORL_IDX*8(RA)
3954 | ldc1 f4, FORL_STEP*8(RA)
3955 | ldc1 f2, FORL_STOP*8(RA)
3956 | lw TMP3, FORL_STEP*8+HI(RA)
3958 | sdc1 f0, FORL_IDX*8(RA)
3960 | lw TMP1, FORL_IDX*8+HI(RA)
3961 | lw TMP3, FORL_STEP*8+HI(RA)
3962 | lw TMP2, FORL_STOP*8+HI(RA)
3963 | sltiu TMP1, TMP1, LJ_TISNUM
3964 | sltiu TMP0, TMP3, LJ_TISNUM
3965 | sltiu TMP2, TMP2, LJ_TISNUM
3966 | and TMP1, TMP1, TMP0
3967 | and TMP1, TMP1, TMP2
3968 | ldc1 f0, FORL_IDX*8(RA)
3969 | beqz TMP1, ->vmeta_for
3970 |. ldc1 f2, FORL_STOP*8(RA)
3972 if (op != BC_JFORL) {
3974 | lui TMP0, (-(BCBIAS_J*4 >> 16) & 65535)
3978 | sdc1 f0, FORL_EXT*8(RA)
3979 if (op == BC_JFORI) {
3982 | addu TMP0, RD, TMP0
3983 | slt TMP3, TMP3, r0
3987 | lhu RD, -4+OFS_RD(PC)
3988 | movn TMP1, TMP2, TMP3
3989 | bnez TMP1, =>BC_JLOOP
3991 } else if (op == BC_JFORL) {
3994 | slt TMP3, TMP3, r0
3997 | movn TMP1, TMP2, TMP3
3998 | bnez TMP1, =>BC_JLOOP
4001 | addu TMP1, RD, TMP0
4002 | slt TMP3, TMP3, r0
4004 if (op == BC_FORI) {
4011 | movn TMP1, TMP2, TMP3
4021 | // Fall through. Assumes BC_IITERL follows.
4029 | // RA = base*8, RD = target
4032 | beq TMP1, TISNIL, >1 // Stop if iterator returned nil.
4034 if (op == BC_JITERL) {
4035 | sw TMP1, -8+HI(RA)
4037 |. sw TMP2, -8+LO(RA)
4039 | branch_RD // Otherwise save control var + branch.
4040 | sw TMP1, -8+HI(RA)
4041 | sw TMP2, -8+LO(RA)
4048 | // RA = base*8, RD = target (loop extent)
4049 | // Note: RA/RD is only used by trace recorder to determine scope/extent
4050 | // This opcode does NOT jump, it's only purpose is to detect a hot loop.
4054 | // Fall through. Assumes BC_ILOOP follows.
4058 | // RA = base*8, RD = target (loop extent)
4064 | // RA = base*8 (ignored), RD = traceno*8
4065 | lw TMP1, DISPATCH_J(trace)(DISPATCH)
4068 | addu TMP1, TMP1, RD
4069 | // Traces on MIPS don't store the trace number, so use 0.
4070 | sw AT, DISPATCH_GL(vmstate)(DISPATCH)
4071 | lw TRACE:TMP2, 0(TMP1)
4072 | sw BASE, DISPATCH_GL(jit_base)(DISPATCH)
4073 | lw TMP2, TRACE:TMP2->mcode
4074 | sw L, DISPATCH_GL(tmpbuf.L)(DISPATCH)
4076 |. addiu JGL, DISPATCH, GG_DISP2G+32768
4081 | // RA = base*8 (only used by trace recorder), RD = target
4086 /* -- Function headers -------------------------------------------------- */
4092 case BC_FUNCV: /* NYI: compiled vararg functions. */
4093 | // Fall through. Assumes BC_IFUNCF/BC_IFUNCV follow.
4101 | // BASE = new base, RA = BASE+framesize*8, RB = LFUNC, RC = nargs*8
4102 | lw TMP2, L->maxstack
4103 | lbu TMP1, -4+PC2PROTO(numparams)(PC)
4104 | lw KBASE, -4+PC2PROTO(k)(PC)
4106 | bnez AT, ->vm_growstack_l
4107 |. sll TMP1, TMP1, 3
4108 if (op != BC_JFUNCF) {
4112 | sltu AT, NARGS8:RC, TMP1 // Check for missing parameters.
4114 |. addu AT, BASE, NARGS8:RC
4115 if (op == BC_JFUNCF) {
4116 | decode_RD8a RD, INS
4123 |3: // Clear missing parameters.
4126 |. addiu NARGS8:RC, NARGS8:RC, 8
4133 | NYI // NYI: compiled vararg functions
4134 break; /* NYI: compiled vararg functions. */
4137 | // BASE = new base, RA = BASE+framesize*8, RB = LFUNC, RC = nargs*8
4138 | addu TMP1, BASE, RC
4139 | lw TMP2, L->maxstack
4141 | sw LFUNC:RB, LO(TMP1) // Store copy of LFUNC.
4142 | addiu TMP3, RC, 8+FRAME_VARG
4143 | sltu AT, TMP0, TMP2
4144 | lw KBASE, -4+PC2PROTO(k)(PC)
4145 | beqz AT, ->vm_growstack_l
4146 |. sw TMP3, HI(TMP1) // Store delta + FRAME_VARG.
4147 | lbu TMP2, -4+PC2PROTO(numparams)(PC)
4152 |. addiu BASE, TMP1, 8
4156 | sltu AT, RA, RC // Less args than parameters?
4158 | movz TMP0, TISNIL, AT // Clear missing parameters.
4159 | movn CARG1, TISNIL, AT // Clear old fixarg slot (help the GC).
4160 | sw TMP3, 8+LO(TMP1)
4161 | addiu TMP2, TMP2, -1
4162 | sw TMP0, 8+HI(TMP1)
4163 | addiu TMP1, TMP1, 8
4173 | // BASE = new base, RA = BASE+framesize*8, RB = CFUNC, RC = nargs*8
4174 if (op == BC_FUNCC) {
4175 | lw CFUNCADDR, CFUNC:RB->f
4177 | lw CFUNCADDR, DISPATCH_GL(wrapf)(DISPATCH)
4179 | addu TMP1, RA, NARGS8:RC
4180 | lw TMP2, L->maxstack
4181 | addu RC, BASE, NARGS8:RC
4183 | sltu AT, TMP2, TMP1
4186 if (op == BC_FUNCCW) {
4187 | lw CARG2, CFUNC:RB->f
4189 | bnez AT, ->vm_growstack_c // Need to grow stack.
4191 | jalr CFUNCADDR // (lua_State *L [, lua_CFunction f])
4193 | // Returns nresults.
4198 | lw PC, FRAME_PC(BASE) // Fetch PC of caller.
4199 | subu RA, TMP1, RD // RA = L->top - nresults*8
4200 | sw L, DISPATCH_GL(cur_L)(DISPATCH)
4205 /* ---------------------------------------------------------------------- */
4208 fprintf(stderr, "Error: undefined opcode BC_%s\n", bc_names[op]);
4214 static int build_backend(BuildCtx *ctx)
4218 dasm_growpc(Dst, BC__MAX);
4220 build_subroutines(ctx);
4223 for (op = 0; op < BC__MAX; op++)
4224 build_ins(ctx, (BCOp)op, op);
4229 /* Emit pseudo frame-info for all assembler functions. */
4230 static void emit_asm_debug(BuildCtx *ctx)
4232 int fcofs = (int)((uint8_t *)ctx->glob[GLOB_vm_ffi_call] - ctx->code);
4234 switch (ctx->mode) {
4236 fprintf(ctx->fp, "\t.section .debug_frame,\"\",@progbits\n");
4239 "\t.4byte .LECIE0-.LSCIE0\n"
4241 "\t.4byte 0xffffffff\n"
4247 "\t.byte 0xc\n\t.uleb128 29\n\t.uleb128 0\n"
4252 "\t.4byte .LEFDE0-.LASFDE0\n"
4254 "\t.4byte .Lframe0\n"
4255 "\t.4byte .Lbegin\n"
4257 "\t.byte 0xe\n\t.uleb128 %d\n"
4258 "\t.byte 0x9f\n\t.sleb128 1\n"
4259 "\t.byte 0x9e\n\t.sleb128 2\n",
4260 fcofs, CFRAME_SIZE);
4261 for (i = 23; i >= 16; i--)
4262 fprintf(ctx->fp, "\t.byte %d\n\t.uleb128 %d\n", 0x80+i, 26-i);
4263 for (i = 30; i >= 20; i -= 2)
4264 fprintf(ctx->fp, "\t.byte %d\n\t.uleb128 %d\n", 0x80+32+i, 42-i);
4271 "\t.4byte .LEFDE1-.LASFDE1\n"
4273 "\t.4byte .Lframe0\n"
4274 "\t.4byte lj_vm_ffi_call\n"
4276 "\t.byte 0x9f\n\t.uleb128 1\n"
4277 "\t.byte 0x90\n\t.uleb128 2\n"
4278 "\t.byte 0xd\n\t.uleb128 0x10\n"
4280 ".LEFDE1:\n\n", (int)ctx->codesz - fcofs);
4282 fprintf(ctx->fp, "\t.section .eh_frame,\"aw\",@progbits\n");
4284 "\t.globl lj_err_unwind_dwarf\n"
4286 "\t.4byte .LECIE1-.LSCIE1\n"
4290 "\t.string \"zPR\"\n"
4294 "\t.uleb128 6\n" /* augmentation length */
4296 "\t.4byte lj_err_unwind_dwarf\n"
4298 "\t.byte 0xc\n\t.uleb128 29\n\t.uleb128 0\n"
4303 "\t.4byte .LEFDE2-.LASFDE2\n"
4305 "\t.4byte .LASFDE2-.Lframe1\n"
4306 "\t.4byte .Lbegin\n"
4308 "\t.uleb128 0\n" /* augmentation length */
4309 "\t.byte 0xe\n\t.uleb128 %d\n"
4310 "\t.byte 0x9f\n\t.sleb128 1\n"
4311 "\t.byte 0x9e\n\t.sleb128 2\n",
4312 fcofs, CFRAME_SIZE);
4313 for (i = 23; i >= 16; i--)
4314 fprintf(ctx->fp, "\t.byte %d\n\t.uleb128 %d\n", 0x80+i, 26-i);
4315 for (i = 30; i >= 20; i -= 2)
4316 fprintf(ctx->fp, "\t.byte %d\n\t.uleb128 %d\n", 0x80+32+i, 42-i);
4323 "\t.4byte .LECIE2-.LSCIE2\n"
4327 "\t.string \"zR\"\n"
4331 "\t.uleb128 1\n" /* augmentation length */
4333 "\t.byte 0xc\n\t.uleb128 29\n\t.uleb128 0\n"
4338 "\t.4byte .LEFDE3-.LASFDE3\n"
4340 "\t.4byte .LASFDE3-.Lframe2\n"
4341 "\t.4byte lj_vm_ffi_call\n"
4343 "\t.uleb128 0\n" /* augmentation length */
4344 "\t.byte 0x9f\n\t.uleb128 1\n"
4345 "\t.byte 0x90\n\t.uleb128 2\n"
4346 "\t.byte 0xd\n\t.uleb128 0x10\n"
4348 ".LEFDE3:\n\n", (int)ctx->codesz - fcofs);