69 CSTYLED BEGINs remain, appx. 30 of which can be removed if cstyle(1) had a useful policy regarding CALL(ARG1, ARG2, ARG3); above 2 lines. As it stands, it spits out *both* sysctl_os.c: 385: continuation line should be indented by 4 spaces sysctl_os.c: 385: indent by spaces instead of tabs which is very cool Another >10 could be fixed by removing "ulong" &al. handling. I don't foresee anyone actually using it intentionally (does it even exist in modern headers? why did it in the first place?). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12993
887 lines
22 KiB
C
887 lines
22 KiB
C
/*
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** $Id: lcode.c,v 2.62.1.1 2013/04/12 18:48:47 roberto Exp $
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** Code generator for Lua
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** See Copyright Notice in lua.h
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*/
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#define lcode_c
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#define LUA_CORE
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#if defined(HAVE_IMPLICIT_FALLTHROUGH)
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#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
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#endif
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#include <sys/lua/lua.h>
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#include "lcode.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lgc.h"
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#include "llex.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lopcodes.h"
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#include "lparser.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "lvm.h"
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#define hasjumps(e) ((e)->t != (e)->f)
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static int isnumeral(expdesc *e) {
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return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP);
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}
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void luaK_nil (FuncState *fs, int from, int n) {
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Instruction *previous;
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int l = from + n - 1; /* last register to set nil */
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if (fs->pc > fs->lasttarget) { /* no jumps to current position? */
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previous = &fs->f->code[fs->pc-1];
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if (GET_OPCODE(*previous) == OP_LOADNIL) {
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int pfrom = GETARG_A(*previous);
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int pl = pfrom + GETARG_B(*previous);
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if ((pfrom <= from && from <= pl + 1) ||
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(from <= pfrom && pfrom <= l + 1)) { /* can connect both? */
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if (pfrom < from) from = pfrom; /* from = min(from, pfrom) */
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if (pl > l) l = pl; /* l = max(l, pl) */
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SETARG_A(*previous, from);
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SETARG_B(*previous, l - from);
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return;
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}
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} /* else go through */
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}
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luaK_codeABC(fs, OP_LOADNIL, from, n - 1, 0); /* else no optimization */
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}
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int luaK_jump (FuncState *fs) {
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int jpc = fs->jpc; /* save list of jumps to here */
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int j;
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fs->jpc = NO_JUMP;
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j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
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luaK_concat(fs, &j, jpc); /* keep them on hold */
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return j;
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}
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void luaK_ret (FuncState *fs, int first, int nret) {
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luaK_codeABC(fs, OP_RETURN, first, nret+1, 0);
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}
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static int condjump (FuncState *fs, OpCode op, int A, int B, int C) {
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luaK_codeABC(fs, op, A, B, C);
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return luaK_jump(fs);
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}
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static void fixjump (FuncState *fs, int pc, int dest) {
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Instruction *jmp = &fs->f->code[pc];
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int offset = dest-(pc+1);
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lua_assert(dest != NO_JUMP);
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if (abs(offset) > MAXARG_sBx)
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luaX_syntaxerror(fs->ls, "control structure too long");
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SETARG_sBx(*jmp, offset);
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}
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/*
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** returns current `pc' and marks it as a jump target (to avoid wrong
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** optimizations with consecutive instructions not in the same basic block).
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*/
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int luaK_getlabel (FuncState *fs) {
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fs->lasttarget = fs->pc;
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return fs->pc;
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}
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static int getjump (FuncState *fs, int pc) {
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int offset = GETARG_sBx(fs->f->code[pc]);
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if (offset == NO_JUMP) /* point to itself represents end of list */
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return NO_JUMP; /* end of list */
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else
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return (pc+1)+offset; /* turn offset into absolute position */
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}
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static Instruction *getjumpcontrol (FuncState *fs, int pc) {
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Instruction *pi = &fs->f->code[pc];
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if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1))))
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return pi-1;
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else
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return pi;
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}
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/*
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** check whether list has any jump that do not produce a value
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** (or produce an inverted value)
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*/
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static int need_value (FuncState *fs, int list) {
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for (; list != NO_JUMP; list = getjump(fs, list)) {
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Instruction i = *getjumpcontrol(fs, list);
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if (GET_OPCODE(i) != OP_TESTSET) return 1;
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}
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return 0; /* not found */
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}
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static int patchtestreg (FuncState *fs, int node, int reg) {
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Instruction *i = getjumpcontrol(fs, node);
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if (GET_OPCODE(*i) != OP_TESTSET)
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return 0; /* cannot patch other instructions */
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if (reg != NO_REG && reg != GETARG_B(*i))
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SETARG_A(*i, reg);
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else /* no register to put value or register already has the value */
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*i = CREATE_ABC(OP_TEST, GETARG_B(*i), 0, GETARG_C(*i));
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return 1;
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}
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static void removevalues (FuncState *fs, int list) {
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for (; list != NO_JUMP; list = getjump(fs, list))
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patchtestreg(fs, list, NO_REG);
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}
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static void patchlistaux (FuncState *fs, int list, int vtarget, int reg,
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int dtarget) {
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while (list != NO_JUMP) {
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int next = getjump(fs, list);
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if (patchtestreg(fs, list, reg))
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fixjump(fs, list, vtarget);
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else
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fixjump(fs, list, dtarget); /* jump to default target */
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list = next;
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}
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}
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static void dischargejpc (FuncState *fs) {
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patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc);
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fs->jpc = NO_JUMP;
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}
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void luaK_patchlist (FuncState *fs, int list, int target) {
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if (target == fs->pc)
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luaK_patchtohere(fs, list);
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else {
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lua_assert(target < fs->pc);
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patchlistaux(fs, list, target, NO_REG, target);
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}
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}
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LUAI_FUNC void luaK_patchclose (FuncState *fs, int list, int level) {
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level++; /* argument is +1 to reserve 0 as non-op */
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while (list != NO_JUMP) {
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int next = getjump(fs, list);
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lua_assert(GET_OPCODE(fs->f->code[list]) == OP_JMP &&
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(GETARG_A(fs->f->code[list]) == 0 ||
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GETARG_A(fs->f->code[list]) >= level));
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SETARG_A(fs->f->code[list], level);
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list = next;
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}
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}
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void luaK_patchtohere (FuncState *fs, int list) {
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luaK_getlabel(fs);
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luaK_concat(fs, &fs->jpc, list);
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}
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void luaK_concat (FuncState *fs, int *l1, int l2) {
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if (l2 == NO_JUMP) return;
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else if (*l1 == NO_JUMP)
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*l1 = l2;
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else {
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int list = *l1;
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int next;
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while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */
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list = next;
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fixjump(fs, list, l2);
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}
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}
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static int luaK_code (FuncState *fs, Instruction i) {
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Proto *f = fs->f;
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dischargejpc(fs); /* `pc' will change */
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/* put new instruction in code array */
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luaM_growvector(fs->ls->L, f->code, fs->pc, f->sizecode, Instruction,
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MAX_INT, "opcodes");
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f->code[fs->pc] = i;
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/* save corresponding line information */
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luaM_growvector(fs->ls->L, f->lineinfo, fs->pc, f->sizelineinfo, int,
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MAX_INT, "opcodes");
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f->lineinfo[fs->pc] = fs->ls->lastline;
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return fs->pc++;
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}
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int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) {
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lua_assert(getOpMode(o) == iABC);
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lua_assert(getBMode(o) != OpArgN || b == 0);
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lua_assert(getCMode(o) != OpArgN || c == 0);
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lua_assert(a <= MAXARG_A && b <= MAXARG_B && c <= MAXARG_C);
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return luaK_code(fs, CREATE_ABC(o, a, b, c));
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}
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int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
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lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx);
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lua_assert(getCMode(o) == OpArgN);
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lua_assert(a <= MAXARG_A && bc <= MAXARG_Bx);
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return luaK_code(fs, CREATE_ABx(o, a, bc));
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}
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static int codeextraarg (FuncState *fs, int a) {
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lua_assert(a <= MAXARG_Ax);
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return luaK_code(fs, CREATE_Ax(OP_EXTRAARG, a));
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}
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int luaK_codek (FuncState *fs, int reg, int k) {
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if (k <= MAXARG_Bx)
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return luaK_codeABx(fs, OP_LOADK, reg, k);
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else {
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int p = luaK_codeABx(fs, OP_LOADKX, reg, 0);
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codeextraarg(fs, k);
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return p;
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}
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}
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void luaK_checkstack (FuncState *fs, int n) {
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int newstack = fs->freereg + n;
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if (newstack > fs->f->maxstacksize) {
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if (newstack >= MAXSTACK)
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luaX_syntaxerror(fs->ls, "function or expression too complex");
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fs->f->maxstacksize = cast_byte(newstack);
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}
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}
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void luaK_reserveregs (FuncState *fs, int n) {
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luaK_checkstack(fs, n);
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fs->freereg += n;
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}
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static void freereg (FuncState *fs, int reg) {
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if (!ISK(reg) && reg >= fs->nactvar) {
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fs->freereg--;
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lua_assert(reg == fs->freereg);
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}
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}
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static void freeexp (FuncState *fs, expdesc *e) {
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if (e->k == VNONRELOC)
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freereg(fs, e->u.info);
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}
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static int addk (FuncState *fs, TValue *key, TValue *v) {
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lua_State *L = fs->ls->L;
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TValue *idx = luaH_set(L, fs->h, key);
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Proto *f = fs->f;
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int k, oldsize;
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if (ttisnumber(idx)) {
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lua_Number n = nvalue(idx);
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lua_number2int(k, n);
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if (luaV_rawequalobj(&f->k[k], v))
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return k;
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/* else may be a collision (e.g., between 0.0 and "\0\0\0\0\0\0\0\0");
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go through and create a new entry for this value */
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}
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/* constant not found; create a new entry */
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oldsize = f->sizek;
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k = fs->nk;
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/* numerical value does not need GC barrier;
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table has no metatable, so it does not need to invalidate cache */
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setnvalue(idx, cast_num(k));
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luaM_growvector(L, f->k, k, f->sizek, TValue, MAXARG_Ax, "constants");
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while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
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setobj(L, &f->k[k], v);
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fs->nk++;
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luaC_barrier(L, f, v);
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return k;
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}
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int luaK_stringK (FuncState *fs, TString *s) {
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TValue o;
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setsvalue(fs->ls->L, &o, s);
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return addk(fs, &o, &o);
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}
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int luaK_numberK (FuncState *fs, lua_Number r) {
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int n;
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lua_State *L = fs->ls->L;
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TValue o;
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setnvalue(&o, r);
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if (r == 0 || luai_numisnan(NULL, r)) { /* handle -0 and NaN */
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/* use raw representation as key to avoid numeric problems */
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setsvalue(L, L->top++, luaS_newlstr(L, (char *)&r, sizeof(r)));
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n = addk(fs, L->top - 1, &o);
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L->top--;
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}
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else
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n = addk(fs, &o, &o); /* regular case */
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return n;
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}
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static int boolK (FuncState *fs, int b) {
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TValue o;
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setbvalue(&o, b);
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return addk(fs, &o, &o);
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}
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static int nilK (FuncState *fs) {
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TValue k, v;
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setnilvalue(&v);
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/* cannot use nil as key; instead use table itself to represent nil */
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sethvalue(fs->ls->L, &k, fs->h);
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return addk(fs, &k, &v);
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}
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void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {
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if (e->k == VCALL) { /* expression is an open function call? */
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SETARG_C(getcode(fs, e), nresults+1);
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}
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else if (e->k == VVARARG) {
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SETARG_B(getcode(fs, e), nresults+1);
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SETARG_A(getcode(fs, e), fs->freereg);
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luaK_reserveregs(fs, 1);
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}
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}
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void luaK_setoneret (FuncState *fs, expdesc *e) {
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if (e->k == VCALL) { /* expression is an open function call? */
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e->k = VNONRELOC;
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e->u.info = GETARG_A(getcode(fs, e));
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}
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else if (e->k == VVARARG) {
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SETARG_B(getcode(fs, e), 2);
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e->k = VRELOCABLE; /* can relocate its simple result */
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}
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}
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void luaK_dischargevars (FuncState *fs, expdesc *e) {
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switch (e->k) {
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case VLOCAL: {
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e->k = VNONRELOC;
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break;
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}
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case VUPVAL: {
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e->u.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.info, 0);
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e->k = VRELOCABLE;
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break;
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}
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case VINDEXED: {
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OpCode op = OP_GETTABUP; /* assume 't' is in an upvalue */
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freereg(fs, e->u.ind.idx);
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if (e->u.ind.vt == VLOCAL) { /* 't' is in a register? */
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freereg(fs, e->u.ind.t);
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op = OP_GETTABLE;
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}
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e->u.info = luaK_codeABC(fs, op, 0, e->u.ind.t, e->u.ind.idx);
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e->k = VRELOCABLE;
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break;
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}
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case VVARARG:
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case VCALL: {
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luaK_setoneret(fs, e);
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break;
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}
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default: break; /* there is one value available (somewhere) */
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}
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}
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static int code_label (FuncState *fs, int A, int b, int jump) {
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luaK_getlabel(fs); /* those instructions may be jump targets */
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return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump);
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}
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static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
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luaK_dischargevars(fs, e);
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switch (e->k) {
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case VNIL: {
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luaK_nil(fs, reg, 1);
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break;
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}
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case VFALSE: case VTRUE: {
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luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0);
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break;
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}
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case VK: {
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luaK_codek(fs, reg, e->u.info);
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break;
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}
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case VKNUM: {
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luaK_codek(fs, reg, luaK_numberK(fs, e->u.nval));
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break;
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}
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case VRELOCABLE: {
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Instruction *pc = &getcode(fs, e);
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SETARG_A(*pc, reg);
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break;
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}
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case VNONRELOC: {
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if (reg != e->u.info)
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luaK_codeABC(fs, OP_MOVE, reg, e->u.info, 0);
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break;
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}
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default: {
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lua_assert(e->k == VVOID || e->k == VJMP);
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return; /* nothing to do... */
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}
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}
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e->u.info = reg;
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e->k = VNONRELOC;
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}
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static void discharge2anyreg (FuncState *fs, expdesc *e) {
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if (e->k != VNONRELOC) {
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luaK_reserveregs(fs, 1);
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discharge2reg(fs, e, fs->freereg-1);
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}
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}
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static void exp2reg (FuncState *fs, expdesc *e, int reg) {
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discharge2reg(fs, e, reg);
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if (e->k == VJMP)
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luaK_concat(fs, &e->t, e->u.info); /* put this jump in `t' list */
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if (hasjumps(e)) {
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int final; /* position after whole expression */
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int p_f = NO_JUMP; /* position of an eventual LOAD false */
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int p_t = NO_JUMP; /* position of an eventual LOAD true */
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if (need_value(fs, e->t) || need_value(fs, e->f)) {
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int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs);
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p_f = code_label(fs, reg, 0, 1);
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p_t = code_label(fs, reg, 1, 0);
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luaK_patchtohere(fs, fj);
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}
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final = luaK_getlabel(fs);
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patchlistaux(fs, e->f, final, reg, p_f);
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patchlistaux(fs, e->t, final, reg, p_t);
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}
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e->f = e->t = NO_JUMP;
|
|
e->u.info = reg;
|
|
e->k = VNONRELOC;
|
|
}
|
|
|
|
|
|
void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
|
|
luaK_dischargevars(fs, e);
|
|
freeexp(fs, e);
|
|
luaK_reserveregs(fs, 1);
|
|
exp2reg(fs, e, fs->freereg - 1);
|
|
}
|
|
|
|
|
|
int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
|
|
luaK_dischargevars(fs, e);
|
|
if (e->k == VNONRELOC) {
|
|
if (!hasjumps(e)) return e->u.info; /* exp is already in a register */
|
|
if (e->u.info >= fs->nactvar) { /* reg. is not a local? */
|
|
exp2reg(fs, e, e->u.info); /* put value on it */
|
|
return e->u.info;
|
|
}
|
|
}
|
|
luaK_exp2nextreg(fs, e); /* default */
|
|
return e->u.info;
|
|
}
|
|
|
|
|
|
void luaK_exp2anyregup (FuncState *fs, expdesc *e) {
|
|
if (e->k != VUPVAL || hasjumps(e))
|
|
luaK_exp2anyreg(fs, e);
|
|
}
|
|
|
|
|
|
void luaK_exp2val (FuncState *fs, expdesc *e) {
|
|
if (hasjumps(e))
|
|
luaK_exp2anyreg(fs, e);
|
|
else
|
|
luaK_dischargevars(fs, e);
|
|
}
|
|
|
|
|
|
int luaK_exp2RK (FuncState *fs, expdesc *e) {
|
|
luaK_exp2val(fs, e);
|
|
switch (e->k) {
|
|
case VTRUE:
|
|
case VFALSE:
|
|
case VNIL: {
|
|
if (fs->nk <= MAXINDEXRK) { /* constant fits in RK operand? */
|
|
e->u.info = (e->k == VNIL) ? nilK(fs) : boolK(fs, (e->k == VTRUE));
|
|
e->k = VK;
|
|
return RKASK(e->u.info);
|
|
}
|
|
else break;
|
|
}
|
|
case VKNUM: {
|
|
e->u.info = luaK_numberK(fs, e->u.nval);
|
|
e->k = VK;
|
|
/* go through */
|
|
}
|
|
case VK: {
|
|
if (e->u.info <= MAXINDEXRK) /* constant fits in argC? */
|
|
return RKASK(e->u.info);
|
|
else break;
|
|
}
|
|
default: break;
|
|
}
|
|
/* not a constant in the right range: put it in a register */
|
|
return luaK_exp2anyreg(fs, e);
|
|
}
|
|
|
|
|
|
void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
|
|
switch (var->k) {
|
|
case VLOCAL: {
|
|
freeexp(fs, ex);
|
|
exp2reg(fs, ex, var->u.info);
|
|
return;
|
|
}
|
|
case VUPVAL: {
|
|
int e = luaK_exp2anyreg(fs, ex);
|
|
luaK_codeABC(fs, OP_SETUPVAL, e, var->u.info, 0);
|
|
break;
|
|
}
|
|
case VINDEXED: {
|
|
OpCode op = (var->u.ind.vt == VLOCAL) ? OP_SETTABLE : OP_SETTABUP;
|
|
int e = luaK_exp2RK(fs, ex);
|
|
luaK_codeABC(fs, op, var->u.ind.t, var->u.ind.idx, e);
|
|
break;
|
|
}
|
|
default: {
|
|
lua_assert(0); /* invalid var kind to store */
|
|
break;
|
|
}
|
|
}
|
|
freeexp(fs, ex);
|
|
}
|
|
|
|
|
|
void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
|
|
int ereg;
|
|
luaK_exp2anyreg(fs, e);
|
|
ereg = e->u.info; /* register where 'e' was placed */
|
|
freeexp(fs, e);
|
|
e->u.info = fs->freereg; /* base register for op_self */
|
|
e->k = VNONRELOC;
|
|
luaK_reserveregs(fs, 2); /* function and 'self' produced by op_self */
|
|
luaK_codeABC(fs, OP_SELF, e->u.info, ereg, luaK_exp2RK(fs, key));
|
|
freeexp(fs, key);
|
|
}
|
|
|
|
|
|
static void invertjump (FuncState *fs, expdesc *e) {
|
|
Instruction *pc = getjumpcontrol(fs, e->u.info);
|
|
lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&
|
|
GET_OPCODE(*pc) != OP_TEST);
|
|
SETARG_A(*pc, !(GETARG_A(*pc)));
|
|
}
|
|
|
|
|
|
static int jumponcond (FuncState *fs, expdesc *e, int cond) {
|
|
if (e->k == VRELOCABLE) {
|
|
Instruction ie = getcode(fs, e);
|
|
if (GET_OPCODE(ie) == OP_NOT) {
|
|
fs->pc--; /* remove previous OP_NOT */
|
|
return condjump(fs, OP_TEST, GETARG_B(ie), 0, !cond);
|
|
}
|
|
/* else go through */
|
|
}
|
|
discharge2anyreg(fs, e);
|
|
freeexp(fs, e);
|
|
return condjump(fs, OP_TESTSET, NO_REG, e->u.info, cond);
|
|
}
|
|
|
|
|
|
void luaK_goiftrue (FuncState *fs, expdesc *e) {
|
|
int pc; /* pc of last jump */
|
|
luaK_dischargevars(fs, e);
|
|
switch (e->k) {
|
|
case VJMP: {
|
|
invertjump(fs, e);
|
|
pc = e->u.info;
|
|
break;
|
|
}
|
|
case VK: case VKNUM: case VTRUE: {
|
|
pc = NO_JUMP; /* always true; do nothing */
|
|
break;
|
|
}
|
|
default: {
|
|
pc = jumponcond(fs, e, 0);
|
|
break;
|
|
}
|
|
}
|
|
luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */
|
|
luaK_patchtohere(fs, e->t);
|
|
e->t = NO_JUMP;
|
|
}
|
|
|
|
|
|
void luaK_goiffalse (FuncState *fs, expdesc *e) {
|
|
int pc; /* pc of last jump */
|
|
luaK_dischargevars(fs, e);
|
|
switch (e->k) {
|
|
case VJMP: {
|
|
pc = e->u.info;
|
|
break;
|
|
}
|
|
case VNIL: case VFALSE: {
|
|
pc = NO_JUMP; /* always false; do nothing */
|
|
break;
|
|
}
|
|
default: {
|
|
pc = jumponcond(fs, e, 1);
|
|
break;
|
|
}
|
|
}
|
|
luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */
|
|
luaK_patchtohere(fs, e->f);
|
|
e->f = NO_JUMP;
|
|
}
|
|
|
|
|
|
static void codenot (FuncState *fs, expdesc *e) {
|
|
luaK_dischargevars(fs, e);
|
|
switch (e->k) {
|
|
case VNIL: case VFALSE: {
|
|
e->k = VTRUE;
|
|
break;
|
|
}
|
|
case VK: case VKNUM: case VTRUE: {
|
|
e->k = VFALSE;
|
|
break;
|
|
}
|
|
case VJMP: {
|
|
invertjump(fs, e);
|
|
break;
|
|
}
|
|
case VRELOCABLE:
|
|
case VNONRELOC: {
|
|
discharge2anyreg(fs, e);
|
|
freeexp(fs, e);
|
|
e->u.info = luaK_codeABC(fs, OP_NOT, 0, e->u.info, 0);
|
|
e->k = VRELOCABLE;
|
|
break;
|
|
}
|
|
default: {
|
|
lua_assert(0); /* cannot happen */
|
|
break;
|
|
}
|
|
}
|
|
/* interchange true and false lists */
|
|
{ int temp = e->f; e->f = e->t; e->t = temp; }
|
|
removevalues(fs, e->f);
|
|
removevalues(fs, e->t);
|
|
}
|
|
|
|
|
|
void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
|
|
lua_assert(!hasjumps(t));
|
|
t->u.ind.t = t->u.info;
|
|
t->u.ind.idx = luaK_exp2RK(fs, k);
|
|
t->u.ind.vt = (t->k == VUPVAL) ? VUPVAL
|
|
: check_exp(vkisinreg(t->k), VLOCAL);
|
|
t->k = VINDEXED;
|
|
}
|
|
|
|
|
|
static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
|
|
lua_Number r;
|
|
if (!isnumeral(e1) || !isnumeral(e2)) return 0;
|
|
if ((op == OP_DIV || op == OP_MOD) && e2->u.nval == 0)
|
|
return 0; /* do not attempt to divide by 0 */
|
|
/*
|
|
* Patched: check for MIN_INT / -1
|
|
*/
|
|
if (op == OP_DIV && e1->u.nval == INT64_MIN && e2->u.nval == -1)
|
|
return 0;
|
|
r = luaO_arith(op - OP_ADD + LUA_OPADD, e1->u.nval, e2->u.nval);
|
|
e1->u.nval = r;
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void codearith (FuncState *fs, OpCode op,
|
|
expdesc *e1, expdesc *e2, int line) {
|
|
if (constfolding(op, e1, e2))
|
|
return;
|
|
else {
|
|
int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
|
|
int o1 = luaK_exp2RK(fs, e1);
|
|
if (o1 > o2) {
|
|
freeexp(fs, e1);
|
|
freeexp(fs, e2);
|
|
}
|
|
else {
|
|
freeexp(fs, e2);
|
|
freeexp(fs, e1);
|
|
}
|
|
e1->u.info = luaK_codeABC(fs, op, 0, o1, o2);
|
|
e1->k = VRELOCABLE;
|
|
luaK_fixline(fs, line);
|
|
}
|
|
}
|
|
|
|
|
|
static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1,
|
|
expdesc *e2) {
|
|
int o1 = luaK_exp2RK(fs, e1);
|
|
int o2 = luaK_exp2RK(fs, e2);
|
|
freeexp(fs, e2);
|
|
freeexp(fs, e1);
|
|
if (cond == 0 && op != OP_EQ) {
|
|
int temp; /* exchange args to replace by `<' or `<=' */
|
|
temp = o1; o1 = o2; o2 = temp; /* o1 <==> o2 */
|
|
cond = 1;
|
|
}
|
|
e1->u.info = condjump(fs, op, cond, o1, o2);
|
|
e1->k = VJMP;
|
|
}
|
|
|
|
|
|
void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e, int line) {
|
|
expdesc e2;
|
|
e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
|
|
switch (op) {
|
|
case OPR_MINUS: {
|
|
if (isnumeral(e)) /* minus constant? */
|
|
e->u.nval = luai_numunm(NULL, e->u.nval); /* fold it */
|
|
else {
|
|
luaK_exp2anyreg(fs, e);
|
|
codearith(fs, OP_UNM, e, &e2, line);
|
|
}
|
|
break;
|
|
}
|
|
case OPR_NOT: codenot(fs, e); break;
|
|
case OPR_LEN: {
|
|
luaK_exp2anyreg(fs, e); /* cannot operate on constants */
|
|
codearith(fs, OP_LEN, e, &e2, line);
|
|
break;
|
|
}
|
|
default: lua_assert(0);
|
|
}
|
|
}
|
|
|
|
|
|
void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
|
|
switch (op) {
|
|
case OPR_AND: {
|
|
luaK_goiftrue(fs, v);
|
|
break;
|
|
}
|
|
case OPR_OR: {
|
|
luaK_goiffalse(fs, v);
|
|
break;
|
|
}
|
|
case OPR_CONCAT: {
|
|
luaK_exp2nextreg(fs, v); /* operand must be on the `stack' */
|
|
break;
|
|
}
|
|
case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV:
|
|
case OPR_MOD: case OPR_POW: {
|
|
if (!isnumeral(v)) luaK_exp2RK(fs, v);
|
|
break;
|
|
}
|
|
default: {
|
|
luaK_exp2RK(fs, v);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void luaK_posfix (FuncState *fs, BinOpr op,
|
|
expdesc *e1, expdesc *e2, int line) {
|
|
switch (op) {
|
|
case OPR_AND: {
|
|
lua_assert(e1->t == NO_JUMP); /* list must be closed */
|
|
luaK_dischargevars(fs, e2);
|
|
luaK_concat(fs, &e2->f, e1->f);
|
|
*e1 = *e2;
|
|
break;
|
|
}
|
|
case OPR_OR: {
|
|
lua_assert(e1->f == NO_JUMP); /* list must be closed */
|
|
luaK_dischargevars(fs, e2);
|
|
luaK_concat(fs, &e2->t, e1->t);
|
|
*e1 = *e2;
|
|
break;
|
|
}
|
|
case OPR_CONCAT: {
|
|
luaK_exp2val(fs, e2);
|
|
if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) {
|
|
lua_assert(e1->u.info == GETARG_B(getcode(fs, e2))-1);
|
|
freeexp(fs, e1);
|
|
SETARG_B(getcode(fs, e2), e1->u.info);
|
|
e1->k = VRELOCABLE; e1->u.info = e2->u.info;
|
|
}
|
|
else {
|
|
luaK_exp2nextreg(fs, e2); /* operand must be on the 'stack' */
|
|
codearith(fs, OP_CONCAT, e1, e2, line);
|
|
}
|
|
break;
|
|
}
|
|
case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV:
|
|
case OPR_MOD: case OPR_POW: {
|
|
codearith(fs, cast(OpCode, op - OPR_ADD + OP_ADD), e1, e2, line);
|
|
break;
|
|
}
|
|
case OPR_EQ: case OPR_LT: case OPR_LE: {
|
|
codecomp(fs, cast(OpCode, op - OPR_EQ + OP_EQ), 1, e1, e2);
|
|
break;
|
|
}
|
|
case OPR_NE: case OPR_GT: case OPR_GE: {
|
|
codecomp(fs, cast(OpCode, op - OPR_NE + OP_EQ), 0, e1, e2);
|
|
break;
|
|
}
|
|
default: lua_assert(0);
|
|
}
|
|
}
|
|
|
|
|
|
void luaK_fixline (FuncState *fs, int line) {
|
|
fs->f->lineinfo[fs->pc - 1] = line;
|
|
}
|
|
|
|
|
|
void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
|
|
int c = (nelems - 1)/LFIELDS_PER_FLUSH + 1;
|
|
int b = (tostore == LUA_MULTRET) ? 0 : tostore;
|
|
lua_assert(tostore != 0);
|
|
if (c <= MAXARG_C)
|
|
luaK_codeABC(fs, OP_SETLIST, base, b, c);
|
|
else if (c <= MAXARG_Ax) {
|
|
luaK_codeABC(fs, OP_SETLIST, base, b, 0);
|
|
codeextraarg(fs, c);
|
|
}
|
|
else
|
|
luaX_syntaxerror(fs->ls, "constructor too long");
|
|
fs->freereg = base + 1; /* free registers with list values */
|
|
}
|