mirror of
https://github.com/lua/lua
synced 2024-12-25 20:06:50 +03:00
better code organization
This commit is contained in:
Roberto Ierusalimschy
parent
e02750ec60
commit
c1666a13e3
200
lcode.c
200
lcode.c
@ -1,5 +1,5 @@
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/*
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** $Id: lcode.c,v 1.24 2000/04/12 18:57:19 roberto Exp roberto $
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** $Id: lcode.c,v 1.25 2000/04/13 16:51:01 roberto Exp roberto $
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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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@ -304,6 +304,49 @@ void luaK_goiffalse (FuncState *fs, expdesc *v, int keepvalue) {
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}
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static int code_label (FuncState *fs, OpCode op, int arg) {
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int j = luaK_getlabel(fs);
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luaK_code1(fs, op, arg);
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return j;
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}
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static void jump_to_value (FuncState *fs, expdesc *v, Instruction previous) {
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int p_nil = NO_JUMP; /* position of an eventual PUSHNIL */
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int p_1 = NO_JUMP; /* position of an eventual PUSHINT */
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int final; /* position after whole expression */
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if (ISJUMP(previous)) {
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luaK_concat(fs, &v->u.l.t, fs->pc-1); /* put `previous' in true list */
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p_nil = code_label(fs, OP_PUSHNILJMP, 0);
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p_1 = code_label(fs, OP_PUSHINT, 1);
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}
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else { /* still may need a PUSHNIL or a PUSHINT */
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int need_nil = need_value(fs, v->u.l.f, OP_JMPONF);
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int need_1 = need_value(fs, v->u.l.t, OP_JMPONT);
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if (need_nil && need_1) {
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int j = code_label(fs, OP_JMP, 0); /* skip both pushes */
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p_nil = code_label(fs, OP_PUSHNILJMP, 0);
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p_1 = code_label(fs, OP_PUSHINT, 1);
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luaK_patchlist(fs, j, luaK_getlabel(fs));
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luaK_deltastack(fs, -1); /* previous PUSHINT may be skipped */
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}
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else if (need_nil || need_1) {
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int j = code_label(fs, OP_JMP, 0); /* skip one push */
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if (need_nil)
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p_nil = code_label(fs, OP_PUSHNIL, 1);
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else /* need_1 */
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p_1 = code_label(fs, OP_PUSHINT, 1);
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luaK_patchlist(fs, j, luaK_getlabel(fs));
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luaK_deltastack(fs, -1); /* previous PUSHs may be skipped */
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}
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}
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final = luaK_getlabel(fs);
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luaK_patchlistaux(fs, v->u.l.f, p_nil, OP_JMPONF, final);
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luaK_patchlistaux(fs, v->u.l.t, p_1, OP_JMPONT, final);
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v->u.l.f = v->u.l.t = NO_JUMP;
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}
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void luaK_tostack (LexState *ls, expdesc *v, int onlyone) {
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FuncState *fs = ls->fs;
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if (!discharge(fs, v)) { /* `v' is an expression? */
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@ -314,38 +357,8 @@ void luaK_tostack (LexState *ls, expdesc *v, int onlyone) {
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if (onlyone)
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luaK_setcallreturns(fs, 1); /* call must return 1 value */
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}
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else { /* expression has jumps... */
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int p_nil = 0; /* position of an eventual PUSHNIL */
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int p_1 = 0; /* position of an eventual PUSHINT */
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int final; /* position after whole expression */
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if (ISJUMP(previous)) {
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luaK_concat(fs, &v->u.l.t, fs->pc-1); /* put `previous' in true list */
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p_nil = luaK_code0(fs, OP_PUSHNILJMP);
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p_1 = luaK_code1(fs, OP_PUSHINT, 1);
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}
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else { /* still may need a PUSHNIL or a PUSHINT */
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int need_nil = need_value(fs, v->u.l.f, OP_JMPONF);
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int need_1 = need_value(fs, v->u.l.t, OP_JMPONT);
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if (need_nil && need_1) {
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luaK_code1(fs, OP_JMP, 2); /* skip both pushes */
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p_nil = luaK_code0(fs, OP_PUSHNILJMP);
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p_1 = luaK_code1(fs, OP_PUSHINT, 1);
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luaK_deltastack(fs, -1); /* previous PUSHINT may be skipped */
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}
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else if (need_nil || need_1) {
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luaK_code1(fs, OP_JMP, 1); /* skip one push */
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if (need_nil)
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p_nil = luaK_code1(fs, OP_PUSHNIL, 1);
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else /* need_1 */
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p_1 = luaK_code1(fs, OP_PUSHINT, 1);
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luaK_deltastack(fs, -1); /* previous PUSHs may be skipped */
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}
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}
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final = luaK_getlabel(fs);
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luaK_patchlistaux(fs, v->u.l.f, p_nil, OP_JMPONF, final);
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luaK_patchlistaux(fs, v->u.l.t, p_1, OP_JMPONT, final);
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v->u.l.f = v->u.l.t = NO_JUMP;
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}
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else /* expression has jumps... */
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jump_to_value(fs, v, previous);
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}
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}
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@ -431,37 +444,93 @@ int luaK_code2 (FuncState *fs, OpCode o, int arg1, int arg2) {
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int delta = 0;
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enum {iO, iU, iS, iAB, iP} mode; /* instruction format (or iP to optimize) */
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mode = iP;
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switch (o) {
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case OP_CLOSURE: delta = -arg2+1; mode = iAB; break;
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case OP_SETLINE: mode = iU; break;
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case OP_CALL: mode = iAB; break;
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case OP_PUSHINT: delta = 1; mode = iS; break;
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case OP_SETGLOBAL: delta = -1; mode = iU; break;
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case OP_SETTABLE: delta = -arg2; mode = iAB; break;
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case OP_SETLIST: delta = -(arg2+1); mode = iAB; break;
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case OP_SETMAP: delta = -2*(arg1+1); mode = iU; break;
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case OP_FORLOOP: delta = -3; arg1 = NO_JUMP; mode = iS; break;
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case OP_CLOSURE:
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delta = -arg2+1;
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mode = iAB;
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break;
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case OP_FORPREP: arg1 = NO_JUMP; /* go through */
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case OP_JMP: mode = iS; break;
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case OP_SETLINE:
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mode = iU;
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break;
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case OP_END: case OP_PUSHNILJMP: case OP_NOT:
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mode = iO; break;
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case OP_CALL:
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mode = iAB;
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break;
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case OP_PUSHSTRING: case OP_PUSHNUM:
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case OP_PUSHNEGNUM: case OP_PUSHUPVALUE:
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case OP_GETGLOBAL: case OP_PUSHSELF: case OP_CREATETABLE:
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delta = 1; mode = iU; break;
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case OP_PUSHINT:
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delta = 1;
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mode = iS;
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break;
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case OP_JMPLT: case OP_JMPLE: case OP_JMPGT: case OP_JMPGE:
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delta = -2; arg1 = NO_JUMP; mode = iS; break;
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case OP_SETTABLE:
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delta = -arg2;
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mode = iAB;
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break;
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case OP_MULT: case OP_DIV: case OP_POW:
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delta = -1; mode = iO; break;
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case OP_SETLIST:
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delta = -(arg2+1);
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mode = iAB;
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break;
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case OP_SETLOCAL: /* `setlocal' default pops one value */
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delta = -1; arg2 = 1; mode = iAB; break;
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case OP_SETMAP:
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delta = -2*(arg1+1);
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mode = iU;
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break;
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case OP_FORLOOP:
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delta = -3;
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arg1 = NO_JUMP;
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mode = iS;
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break;
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case OP_SETLOCAL:
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case OP_SETGLOBAL:
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delta = -1;
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mode = iU;
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break;
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case OP_FORPREP:
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case OP_JMP:
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arg1 = NO_JUMP;
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mode = iS;
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break;
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case OP_END:
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case OP_PUSHNILJMP:
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case OP_NOT:
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mode = iO;
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break;
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case OP_PUSHSTRING:
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case OP_PUSHNUM:
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case OP_PUSHNEGNUM:
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case OP_PUSHUPVALUE:
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case OP_GETLOCAL:
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case OP_GETGLOBAL:
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case OP_PUSHSELF:
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case OP_CREATETABLE:
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delta = 1;
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mode = iU;
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break;
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case OP_JMPLT:
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case OP_JMPLE:
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case OP_JMPGT:
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case OP_JMPGE:
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delta = -2;
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arg1 = NO_JUMP;
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mode = iS;
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break;
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case OP_MULT:
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case OP_DIV:
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case OP_POW:
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delta = -1;
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mode = iO;
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break;
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case OP_RETURN:
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if (GET_OPCODE(i) == OP_CALL && GETARG_B(i) == MULT_RET) {
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@ -483,18 +552,10 @@ int luaK_code2 (FuncState *fs, OpCode o, int arg1, int arg2) {
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delta = -arg1;
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switch(GET_OPCODE(i)) {
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case OP_SETTABLE: SETARG_B(i, GETARG_B(i)+arg1); break;
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case OP_SETLOCAL: SETARG_B(i, GETARG_B(i)+arg1); break;
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default: mode = iU; break;
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}
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break;
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case OP_GETLOCAL:
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delta = 1;
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if (i == CREATE_AB(OP_SETLOCAL, arg1, 1))
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SETARG_B(i, 0);
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else mode = iU;
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break;
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case OP_GETTABLE:
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delta = -1;
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switch(GET_OPCODE(i)) {
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@ -558,7 +619,10 @@ int luaK_code2 (FuncState *fs, OpCode o, int arg1, int arg2) {
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}
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break;
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case OP_JMPT: case OP_JMPF: case OP_JMPONT: case OP_JMPONF:
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case OP_JMPT:
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case OP_JMPF:
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case OP_JMPONT:
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case OP_JMPONF:
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delta = -1;
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arg1 = NO_JUMP;
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switch (GET_OPCODE(i)) {
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@ -567,8 +631,10 @@ int luaK_code2 (FuncState *fs, OpCode o, int arg1, int arg2) {
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}
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break;
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case OP_GETDOTTED: case OP_GETINDEXED:
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case OP_TAILCALL: case OP_ADDI:
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case OP_GETDOTTED:
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case OP_GETINDEXED:
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case OP_TAILCALL:
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case OP_ADDI:
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LUA_INTERNALERROR(L, "instruction used only for optimizations");
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return 0; /* to avoid warnings */
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