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-rw-r--r--lib/LuaJIT/src/lj_meta.c477
1 files changed, 0 insertions, 477 deletions
diff --git a/lib/LuaJIT/src/lj_meta.c b/lib/LuaJIT/src/lj_meta.c
deleted file mode 100644
index 0bd4d84..0000000
--- a/lib/LuaJIT/src/lj_meta.c
+++ /dev/null
@@ -1,477 +0,0 @@
-/*
-** Metamethod handling.
-** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
-**
-** Portions taken verbatim or adapted from the Lua interpreter.
-** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
-*/
-
-#define lj_meta_c
-#define LUA_CORE
-
-#include "lj_obj.h"
-#include "lj_gc.h"
-#include "lj_err.h"
-#include "lj_buf.h"
-#include "lj_str.h"
-#include "lj_tab.h"
-#include "lj_meta.h"
-#include "lj_frame.h"
-#include "lj_bc.h"
-#include "lj_vm.h"
-#include "lj_strscan.h"
-#include "lj_strfmt.h"
-#include "lj_lib.h"
-
-/* -- Metamethod handling ------------------------------------------------- */
-
-/* String interning of metamethod names for fast indexing. */
-void lj_meta_init(lua_State *L)
-{
-#define MMNAME(name) "__" #name
- const char *metanames = MMDEF(MMNAME);
-#undef MMNAME
- global_State *g = G(L);
- const char *p, *q;
- uint32_t mm;
- for (mm = 0, p = metanames; *p; mm++, p = q) {
- GCstr *s;
- for (q = p+2; *q && *q != '_'; q++) ;
- s = lj_str_new(L, p, (size_t)(q-p));
- /* NOBARRIER: g->gcroot[] is a GC root. */
- setgcref(g->gcroot[GCROOT_MMNAME+mm], obj2gco(s));
- }
-}
-
-/* Negative caching of a few fast metamethods. See the lj_meta_fast() macro. */
-cTValue *lj_meta_cache(GCtab *mt, MMS mm, GCstr *name)
-{
- cTValue *mo = lj_tab_getstr(mt, name);
- lua_assert(mm <= MM_FAST);
- if (!mo || tvisnil(mo)) { /* No metamethod? */
- mt->nomm |= (uint8_t)(1u<<mm); /* Set negative cache flag. */
- return NULL;
- }
- return mo;
-}
-
-/* Lookup metamethod for object. */
-cTValue *lj_meta_lookup(lua_State *L, cTValue *o, MMS mm)
-{
- GCtab *mt;
- if (tvistab(o))
- mt = tabref(tabV(o)->metatable);
- else if (tvisudata(o))
- mt = tabref(udataV(o)->metatable);
- else
- mt = tabref(basemt_obj(G(L), o));
- if (mt) {
- cTValue *mo = lj_tab_getstr(mt, mmname_str(G(L), mm));
- if (mo)
- return mo;
- }
- return niltv(L);
-}
-
-#if LJ_HASFFI
-/* Tailcall from C function. */
-int lj_meta_tailcall(lua_State *L, cTValue *tv)
-{
- TValue *base = L->base;
- TValue *top = L->top;
- const BCIns *pc = frame_pc(base-1); /* Preserve old PC from frame. */
- copyTV(L, base-1-LJ_FR2, tv); /* Replace frame with new object. */
- if (LJ_FR2)
- (top++)->u64 = LJ_CONT_TAILCALL;
- else
- top->u32.lo = LJ_CONT_TAILCALL;
- setframe_pc(top++, pc);
- if (LJ_FR2) top++;
- setframe_gc(top, obj2gco(L), LJ_TTHREAD); /* Dummy frame object. */
- setframe_ftsz(top, ((char *)(top+1) - (char *)base) + FRAME_CONT);
- L->base = L->top = top+1;
- /*
- ** before: [old_mo|PC] [... ...]
- ** ^base ^top
- ** after: [new_mo|itype] [... ...] [NULL|PC] [dummy|delta]
- ** ^base/top
- ** tailcall: [new_mo|PC] [... ...]
- ** ^base ^top
- */
- return 0;
-}
-#endif
-
-/* Setup call to metamethod to be run by Assembler VM. */
-static TValue *mmcall(lua_State *L, ASMFunction cont, cTValue *mo,
- cTValue *a, cTValue *b)
-{
- /*
- ** |-- framesize -> top top+1 top+2 top+3
- ** before: [func slots ...]
- ** mm setup: [func slots ...] [cont|?] [mo|tmtype] [a] [b]
- ** in asm: [func slots ...] [cont|PC] [mo|delta] [a] [b]
- ** ^-- func base ^-- mm base
- ** after mm: [func slots ...] [result]
- ** ^-- copy to base[PC_RA] --/ for lj_cont_ra
- ** istruecond + branch for lj_cont_cond*
- ** ignore for lj_cont_nop
- ** next PC: [func slots ...]
- */
- TValue *top = L->top;
- if (curr_funcisL(L)) top = curr_topL(L);
- setcont(top++, cont); /* Assembler VM stores PC in upper word or FR2. */
- if (LJ_FR2) setnilV(top++);
- copyTV(L, top++, mo); /* Store metamethod and two arguments. */
- if (LJ_FR2) setnilV(top++);
- copyTV(L, top, a);
- copyTV(L, top+1, b);
- return top; /* Return new base. */
-}
-
-/* -- C helpers for some instructions, called from assembler VM ----------- */
-
-/* Helper for TGET*. __index chain and metamethod. */
-cTValue *lj_meta_tget(lua_State *L, cTValue *o, cTValue *k)
-{
- int loop;
- for (loop = 0; loop < LJ_MAX_IDXCHAIN; loop++) {
- cTValue *mo;
- if (LJ_LIKELY(tvistab(o))) {
- GCtab *t = tabV(o);
- cTValue *tv = lj_tab_get(L, t, k);
- if (!tvisnil(tv) ||
- !(mo = lj_meta_fast(L, tabref(t->metatable), MM_index)))
- return tv;
- } else if (tvisnil(mo = lj_meta_lookup(L, o, MM_index))) {
- lj_err_optype(L, o, LJ_ERR_OPINDEX);
- return NULL; /* unreachable */
- }
- if (tvisfunc(mo)) {
- L->top = mmcall(L, lj_cont_ra, mo, o, k);
- return NULL; /* Trigger metamethod call. */
- }
- o = mo;
- }
- lj_err_msg(L, LJ_ERR_GETLOOP);
- return NULL; /* unreachable */
-}
-
-/* Helper for TSET*. __newindex chain and metamethod. */
-TValue *lj_meta_tset(lua_State *L, cTValue *o, cTValue *k)
-{
- TValue tmp;
- int loop;
- for (loop = 0; loop < LJ_MAX_IDXCHAIN; loop++) {
- cTValue *mo;
- if (LJ_LIKELY(tvistab(o))) {
- GCtab *t = tabV(o);
- cTValue *tv = lj_tab_get(L, t, k);
- if (LJ_LIKELY(!tvisnil(tv))) {
- t->nomm = 0; /* Invalidate negative metamethod cache. */
- lj_gc_anybarriert(L, t);
- return (TValue *)tv;
- } else if (!(mo = lj_meta_fast(L, tabref(t->metatable), MM_newindex))) {
- t->nomm = 0; /* Invalidate negative metamethod cache. */
- lj_gc_anybarriert(L, t);
- if (tv != niltv(L))
- return (TValue *)tv;
- if (tvisnil(k)) lj_err_msg(L, LJ_ERR_NILIDX);
- else if (tvisint(k)) { setnumV(&tmp, (lua_Number)intV(k)); k = &tmp; }
- else if (tvisnum(k) && tvisnan(k)) lj_err_msg(L, LJ_ERR_NANIDX);
- return lj_tab_newkey(L, t, k);
- }
- } else if (tvisnil(mo = lj_meta_lookup(L, o, MM_newindex))) {
- lj_err_optype(L, o, LJ_ERR_OPINDEX);
- return NULL; /* unreachable */
- }
- if (tvisfunc(mo)) {
- L->top = mmcall(L, lj_cont_nop, mo, o, k);
- /* L->top+2 = v filled in by caller. */
- return NULL; /* Trigger metamethod call. */
- }
- copyTV(L, &tmp, mo);
- o = &tmp;
- }
- lj_err_msg(L, LJ_ERR_SETLOOP);
- return NULL; /* unreachable */
-}
-
-static cTValue *str2num(cTValue *o, TValue *n)
-{
- if (tvisnum(o))
- return o;
- else if (tvisint(o))
- return (setnumV(n, (lua_Number)intV(o)), n);
- else if (tvisstr(o) && lj_strscan_num(strV(o), n))
- return n;
- else
- return NULL;
-}
-
-/* Helper for arithmetic instructions. Coercion, metamethod. */
-TValue *lj_meta_arith(lua_State *L, TValue *ra, cTValue *rb, cTValue *rc,
- BCReg op)
-{
- MMS mm = bcmode_mm(op);
- TValue tempb, tempc;
- cTValue *b, *c;
- if ((b = str2num(rb, &tempb)) != NULL &&
- (c = str2num(rc, &tempc)) != NULL) { /* Try coercion first. */
- setnumV(ra, lj_vm_foldarith(numV(b), numV(c), (int)mm-MM_add));
- return NULL;
- } else {
- cTValue *mo = lj_meta_lookup(L, rb, mm);
- if (tvisnil(mo)) {
- mo = lj_meta_lookup(L, rc, mm);
- if (tvisnil(mo)) {
- if (str2num(rb, &tempb) == NULL) rc = rb;
- lj_err_optype(L, rc, LJ_ERR_OPARITH);
- return NULL; /* unreachable */
- }
- }
- return mmcall(L, lj_cont_ra, mo, rb, rc);
- }
-}
-
-/* Helper for CAT. Coercion, iterative concat, __concat metamethod. */
-TValue *lj_meta_cat(lua_State *L, TValue *top, int left)
-{
- int fromc = 0;
- if (left < 0) { left = -left; fromc = 1; }
- do {
- if (!(tvisstr(top) || tvisnumber(top)) ||
- !(tvisstr(top-1) || tvisnumber(top-1))) {
- cTValue *mo = lj_meta_lookup(L, top-1, MM_concat);
- if (tvisnil(mo)) {
- mo = lj_meta_lookup(L, top, MM_concat);
- if (tvisnil(mo)) {
- if (tvisstr(top-1) || tvisnumber(top-1)) top++;
- lj_err_optype(L, top-1, LJ_ERR_OPCAT);
- return NULL; /* unreachable */
- }
- }
- /* One of the top two elements is not a string, call __cat metamethod:
- **
- ** before: [...][CAT stack .........................]
- ** top-1 top top+1 top+2
- ** pick two: [...][CAT stack ...] [o1] [o2]
- ** setup mm: [...][CAT stack ...] [cont|?] [mo|tmtype] [o1] [o2]
- ** in asm: [...][CAT stack ...] [cont|PC] [mo|delta] [o1] [o2]
- ** ^-- func base ^-- mm base
- ** after mm: [...][CAT stack ...] <--push-- [result]
- ** next step: [...][CAT stack .............]
- */
- copyTV(L, top+2*LJ_FR2+2, top); /* Carefully ordered stack copies! */
- copyTV(L, top+2*LJ_FR2+1, top-1);
- copyTV(L, top+LJ_FR2, mo);
- setcont(top-1, lj_cont_cat);
- if (LJ_FR2) { setnilV(top); setnilV(top+2); top += 2; }
- return top+1; /* Trigger metamethod call. */
- } else {
- /* Pick as many strings as possible from the top and concatenate them:
- **
- ** before: [...][CAT stack ...........................]
- ** pick str: [...][CAT stack ...] [...... strings ......]
- ** concat: [...][CAT stack ...] [result]
- ** next step: [...][CAT stack ............]
- */
- TValue *e, *o = top;
- uint64_t tlen = tvisstr(o) ? strV(o)->len : STRFMT_MAXBUF_NUM;
- SBuf *sb;
- do {
- o--; tlen += tvisstr(o) ? strV(o)->len : STRFMT_MAXBUF_NUM;
- } while (--left > 0 && (tvisstr(o-1) || tvisnumber(o-1)));
- if (tlen >= LJ_MAX_STR) lj_err_msg(L, LJ_ERR_STROV);
- sb = lj_buf_tmp_(L);
- lj_buf_more(sb, (MSize)tlen);
- for (e = top, top = o; o <= e; o++) {
- if (tvisstr(o)) {
- GCstr *s = strV(o);
- MSize len = s->len;
- lj_buf_putmem(sb, strdata(s), len);
- } else if (tvisint(o)) {
- lj_strfmt_putint(sb, intV(o));
- } else {
- lj_strfmt_putfnum(sb, STRFMT_G14, numV(o));
- }
- }
- setstrV(L, top, lj_buf_str(L, sb));
- }
- } while (left >= 1);
- if (LJ_UNLIKELY(G(L)->gc.total >= G(L)->gc.threshold)) {
- if (!fromc) L->top = curr_topL(L);
- lj_gc_step(L);
- }
- return NULL;
-}
-
-/* Helper for LEN. __len metamethod. */
-TValue * LJ_FASTCALL lj_meta_len(lua_State *L, cTValue *o)
-{
- cTValue *mo = lj_meta_lookup(L, o, MM_len);
- if (tvisnil(mo)) {
- if (LJ_52 && tvistab(o))
- tabref(tabV(o)->metatable)->nomm |= (uint8_t)(1u<<MM_len);
- else
- lj_err_optype(L, o, LJ_ERR_OPLEN);
- return NULL;
- }
- return mmcall(L, lj_cont_ra, mo, o, LJ_52 ? o : niltv(L));
-}
-
-/* Helper for equality comparisons. __eq metamethod. */
-TValue *lj_meta_equal(lua_State *L, GCobj *o1, GCobj *o2, int ne)
-{
- /* Field metatable must be at same offset for GCtab and GCudata! */
- cTValue *mo = lj_meta_fast(L, tabref(o1->gch.metatable), MM_eq);
- if (mo) {
- TValue *top;
- uint32_t it;
- if (tabref(o1->gch.metatable) != tabref(o2->gch.metatable)) {
- cTValue *mo2 = lj_meta_fast(L, tabref(o2->gch.metatable), MM_eq);
- if (mo2 == NULL || !lj_obj_equal(mo, mo2))
- return (TValue *)(intptr_t)ne;
- }
- top = curr_top(L);
- setcont(top++, ne ? lj_cont_condf : lj_cont_condt);
- if (LJ_FR2) setnilV(top++);
- copyTV(L, top++, mo);
- if (LJ_FR2) setnilV(top++);
- it = ~(uint32_t)o1->gch.gct;
- setgcV(L, top, o1, it);
- setgcV(L, top+1, o2, it);
- return top; /* Trigger metamethod call. */
- }
- return (TValue *)(intptr_t)ne;
-}
-
-#if LJ_HASFFI
-TValue * LJ_FASTCALL lj_meta_equal_cd(lua_State *L, BCIns ins)
-{
- ASMFunction cont = (bc_op(ins) & 1) ? lj_cont_condf : lj_cont_condt;
- int op = (int)bc_op(ins) & ~1;
- TValue tv;
- cTValue *mo, *o2, *o1 = &L->base[bc_a(ins)];
- cTValue *o1mm = o1;
- if (op == BC_ISEQV) {
- o2 = &L->base[bc_d(ins)];
- if (!tviscdata(o1mm)) o1mm = o2;
- } else if (op == BC_ISEQS) {
- setstrV(L, &tv, gco2str(proto_kgc(curr_proto(L), ~(ptrdiff_t)bc_d(ins))));
- o2 = &tv;
- } else if (op == BC_ISEQN) {
- o2 = &mref(curr_proto(L)->k, cTValue)[bc_d(ins)];
- } else {
- lua_assert(op == BC_ISEQP);
- setpriV(&tv, ~bc_d(ins));
- o2 = &tv;
- }
- mo = lj_meta_lookup(L, o1mm, MM_eq);
- if (LJ_LIKELY(!tvisnil(mo)))
- return mmcall(L, cont, mo, o1, o2);
- else
- return (TValue *)(intptr_t)(bc_op(ins) & 1);
-}
-#endif
-
-/* Helper for ordered comparisons. String compare, __lt/__le metamethods. */
-TValue *lj_meta_comp(lua_State *L, cTValue *o1, cTValue *o2, int op)
-{
- if (LJ_HASFFI && (tviscdata(o1) || tviscdata(o2))) {
- ASMFunction cont = (op & 1) ? lj_cont_condf : lj_cont_condt;
- MMS mm = (op & 2) ? MM_le : MM_lt;
- cTValue *mo = lj_meta_lookup(L, tviscdata(o1) ? o1 : o2, mm);
- if (LJ_UNLIKELY(tvisnil(mo))) goto err;
- return mmcall(L, cont, mo, o1, o2);
- } else if (LJ_52 || itype(o1) == itype(o2)) {
- /* Never called with two numbers. */
- if (tvisstr(o1) && tvisstr(o2)) {
- int32_t res = lj_str_cmp(strV(o1), strV(o2));
- return (TValue *)(intptr_t)(((op&2) ? res <= 0 : res < 0) ^ (op&1));
- } else {
- trymt:
- while (1) {
- ASMFunction cont = (op & 1) ? lj_cont_condf : lj_cont_condt;
- MMS mm = (op & 2) ? MM_le : MM_lt;
- cTValue *mo = lj_meta_lookup(L, o1, mm);
-#if LJ_52
- if (tvisnil(mo) && tvisnil((mo = lj_meta_lookup(L, o2, mm))))
-#else
- cTValue *mo2 = lj_meta_lookup(L, o2, mm);
- if (tvisnil(mo) || !lj_obj_equal(mo, mo2))
-#endif
- {
- if (op & 2) { /* MM_le not found: retry with MM_lt. */
- cTValue *ot = o1; o1 = o2; o2 = ot; /* Swap operands. */
- op ^= 3; /* Use LT and flip condition. */
- continue;
- }
- goto err;
- }
- return mmcall(L, cont, mo, o1, o2);
- }
- }
- } else if (tvisbool(o1) && tvisbool(o2)) {
- goto trymt;
- } else {
- err:
- lj_err_comp(L, o1, o2);
- return NULL;
- }
-}
-
-/* Helper for ISTYPE and ISNUM. Implicit coercion or error. */
-void lj_meta_istype(lua_State *L, BCReg ra, BCReg tp)
-{
- L->top = curr_topL(L);
- ra++; tp--;
- lua_assert(LJ_DUALNUM || tp != ~LJ_TNUMX); /* ISTYPE -> ISNUM broken. */
- if (LJ_DUALNUM && tp == ~LJ_TNUMX) lj_lib_checkint(L, ra);
- else if (tp == ~LJ_TNUMX+1) lj_lib_checknum(L, ra);
- else if (tp == ~LJ_TSTR) lj_lib_checkstr(L, ra);
- else lj_err_argtype(L, ra, lj_obj_itypename[tp]);
-}
-
-/* Helper for calls. __call metamethod. */
-void lj_meta_call(lua_State *L, TValue *func, TValue *top)
-{
- cTValue *mo = lj_meta_lookup(L, func, MM_call);
- TValue *p;
- if (!tvisfunc(mo))
- lj_err_optype_call(L, func);
- for (p = top; p > func+2*LJ_FR2; p--) copyTV(L, p, p-1);
- if (LJ_FR2) copyTV(L, func+2, func);
- copyTV(L, func, mo);
-}
-
-/* Helper for FORI. Coercion. */
-void LJ_FASTCALL lj_meta_for(lua_State *L, TValue *o)
-{
- if (!lj_strscan_numberobj(o)) lj_err_msg(L, LJ_ERR_FORINIT);
- if (!lj_strscan_numberobj(o+1)) lj_err_msg(L, LJ_ERR_FORLIM);
- if (!lj_strscan_numberobj(o+2)) lj_err_msg(L, LJ_ERR_FORSTEP);
- if (LJ_DUALNUM) {
- /* Ensure all slots are integers or all slots are numbers. */
- int32_t k[3];
- int nint = 0;
- ptrdiff_t i;
- for (i = 0; i <= 2; i++) {
- if (tvisint(o+i)) {
- k[i] = intV(o+i); nint++;
- } else {
- k[i] = lj_num2int(numV(o+i)); nint += ((lua_Number)k[i] == numV(o+i));
- }
- }
- if (nint == 3) { /* Narrow to integers. */
- setintV(o, k[0]);
- setintV(o+1, k[1]);
- setintV(o+2, k[2]);
- } else if (nint != 0) { /* Widen to numbers. */
- if (tvisint(o)) setnumV(o, (lua_Number)intV(o));
- if (tvisint(o+1)) setnumV(o+1, (lua_Number)intV(o+1));
- if (tvisint(o+2)) setnumV(o+2, (lua_Number)intV(o+2));
- }
- }
-}
-
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