mirror of
https://github.com/lua/lua
synced 2024-11-22 12:51:30 +03:00
implementation of `global' statement
This commit is contained in:
Roberto Ierusalimschy
parent
207dad8606
commit
7ff21273d6
@ -1,5 +1,5 @@
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/*
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** $Id: llimits.h,v 1.38 2002/03/05 16:22:54 roberto Exp roberto $
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** $Id: llimits.h,v 1.39 2002/03/07 18:11:51 roberto Exp roberto $
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** Limits, basic types, and some other `installation-dependent' definitions
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** See Copyright Notice in lua.h
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*/
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@ -96,9 +96,9 @@ typedef unsigned long Instruction;
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#define MAXSTACK 250
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/* maximum number of local variables */
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#ifndef MAXLOCALS
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#define MAXLOCALS 200 /* arbitrary limit (<MAXSTACK) */
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/* maximum number of variables declared in a function */
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#ifndef MAXVARS
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#define MAXVARS 200 /* arbitrary limit (<MAXSTACK) */
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#endif
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269
lparser.c
269
lparser.c
@ -1,5 +1,5 @@
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/*
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** $Id: lparser.c,v 1.167 2002/02/14 21:46:58 roberto Exp $
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** $Id: lparser.c,v 1.168 2002/03/08 19:10:32 roberto Exp roberto $
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** Lua Parser
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** See Copyright Notice in lua.h
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*/
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@ -24,14 +24,17 @@
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/*
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** nodes for break list (list of active breakable loops)
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** nodes for block list (list of active blocks)
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*/
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typedef struct Breaklabel {
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struct Breaklabel *previous; /* chain */
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typedef struct BlockCnt {
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struct BlockCnt *previous; /* chain */
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int breaklist; /* list of jumps out of this loop */
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int nactloc; /* # of active local variables outside the breakable structure */
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} Breaklabel;
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int nactloc; /* # active local variables outside the breakable structure */
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int nactvar;
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int defaultglob;
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int upval; /* true if some variable in the block is an upvalue */
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int isbreakable; /* true if `block' is a loop */
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} BlockCnt;
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@ -77,9 +80,7 @@ static void check (LexState *ls, int c) {
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}
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static void check_condition (LexState *ls, int c, const char *msg) {
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if (!c) luaK_error(ls, msg);
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}
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#define check_condition(ls,c,msg) { if (!(c)) luaK_error(ls, msg); }
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static int optional (LexState *ls, int c) {
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@ -143,41 +144,51 @@ static int luaI_registerlocalvar (LexState *ls, TString *varname) {
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}
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static void new_localvar (LexState *ls, TString *name, int n) {
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static vardesc *new_var (LexState *ls, int n) {
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FuncState *fs = ls->fs;
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luaX_checklimit(ls, fs->nactloc+n+1, MAXLOCALS, "local variables");
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fs->actloc[fs->nactloc+n] = luaI_registerlocalvar(ls, name);
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luaX_checklimit(ls, fs->nactvar+n+1, MAXVARS, "variables");
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return &fs->actvar[fs->nactvar+n];
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}
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static void new_localvar (LexState *ls, TString *name, int n) {
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vardesc *v = new_var(ls, n);
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v->k = VLOCAL;
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v->i = luaI_registerlocalvar(ls, name);
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v->level = ls->fs->nactloc + n;
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}
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static void adjustlocalvars (LexState *ls, int nvars) {
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FuncState *fs = ls->fs;
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while (nvars--) {
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fs->f->locvars[fs->actloc[fs->nactloc]].startpc = fs->pc;
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resetbit(fs->wasup, fs->nactloc);
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lua_assert(fs->actvar[fs->nactvar].k == VLOCAL);
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fs->f->locvars[fs->actvar[fs->nactvar].i].startpc = fs->pc;
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fs->nactvar++;
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fs->nactloc++;
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}
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}
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static void closelevel (LexState *ls, int level) {
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static void adjustglobalvars (LexState *ls, int nvars, int level) {
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FuncState *fs = ls->fs;
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int i;
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for (i=level; i<fs->nactloc; i++)
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if (testbit(fs->wasup, i)) {
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luaK_codeABC(fs, OP_CLOSE, level, 0, 0);
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return;
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}
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return; /* nothing to close */
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while (nvars--) {
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fs->actvar[fs->nactvar].k = VGLOBAL;
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fs->actvar[fs->nactvar].level = level;
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fs->nactvar++;
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}
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}
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static void removelocalvars (LexState *ls, int nvars, int toclose) {
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static void removevars (LexState *ls, int tolevel) {
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FuncState *fs = ls->fs;
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if (toclose)
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closelevel(ls, fs->nactloc - nvars);
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while (nvars--)
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fs->f->locvars[fs->actloc[--fs->nactloc]].endpc = fs->pc;
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while (fs->nactvar > tolevel) {
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fs->nactvar--;
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if (fs->actvar[fs->nactvar].k == VLOCAL) {
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fs->nactloc--;
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fs->f->locvars[fs->actvar[fs->nactvar].i].endpc = fs->pc;
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}
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}
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}
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@ -186,6 +197,12 @@ static void new_localvarstr (LexState *ls, const char *name, int n) {
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}
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static void create_local (LexState *ls, const char *name) {
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new_localvarstr(ls, name, 0);
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adjustlocalvars(ls, 1);
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}
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static int indexupvalue (FuncState *fs, expdesc *v) {
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int i;
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for (i=0; i<fs->f->nupvalues; i++) {
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@ -199,28 +216,72 @@ static int indexupvalue (FuncState *fs, expdesc *v) {
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}
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static void singlevar (FuncState *fs, TString *n, expdesc *var, int baselevel) {
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if (fs == NULL)
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init_exp(var, VGLOBAL, 0); /* not local in any level; global variable */
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else { /* look up at current level */
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int i;
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for (i=fs->nactloc-1; i >= 0; i--) {
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if (n == fs->f->locvars[fs->actloc[i]].varname) {
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if (!baselevel)
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setbit(fs->wasup, i); /* will be upvalue in some other level */
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init_exp(var, VLOCAL, i);
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return;
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static vardesc *searchvar (FuncState *fs, TString *n) {
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int i;
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for (i=fs->nactvar-1; i >= 0; i--) {
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vardesc *v = &fs->actvar[i];
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if (v->k == VLOCAL ? n == fs->f->locvars[v->i].varname
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: n == tsvalue(&fs->f->k[v->i]))
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return v;
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}
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return NULL; /* not found */
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}
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static void markupval (FuncState *fs, int level) {
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BlockCnt *bl = fs->bl;
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while (bl && bl->nactloc > level) bl = bl->previous;
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if (bl) bl->upval = 1;
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}
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static int singlevar_aux (FuncState *fs, TString *n, expdesc *var, int nd) {
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if (fs == NULL) { /* no more levels? */
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init_exp(var, VGLOBAL, NO_REG); /* default is free global */
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return VNIL; /* not found */
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}
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else {
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vardesc *v = searchvar(fs, n); /* look up at current level */
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if (v) {
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if (v->level == NO_REG) { /* free global? */
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lua_assert(v->k == VGLOBAL);
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init_exp(var, VGLOBAL, NO_REG);
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}
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else
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init_exp(var, VLOCAL, v->level);
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return v->k;
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}
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/* not found at current level; try upper one */
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singlevar(fs->prev, n, var, 0);
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if (var->k == VGLOBAL) {
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if (baselevel)
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var->info = luaK_stringK(fs, n); /* info points to global name */
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else { /* not found at current level; try upper one */
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int k = singlevar_aux(fs->prev, n, var, nd && fs->defaultglob == NO_REG);
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if (var->k == VGLOBAL) {
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if (k == VNIL && nd && fs->defaultglob != NO_REG) {
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init_exp(var, VLOCAL, fs->defaultglob);
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k = VGLOBAL; /* now there is a declaration */
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}
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}
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else { /* LOCAL or UPVAL */
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if (var->k == VLOCAL)
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markupval(fs->prev, var->info); /* local will be used as an upval */
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var->info = indexupvalue(fs, var);
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var->k = VUPVAL; /* upvalue in this level */
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}
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return k;
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}
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else { /* local variable in some upper level? */
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var->info = indexupvalue(fs, var);
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var->k = VUPVAL; /* upvalue in this level */
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}
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}
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static void singlevar (FuncState *fs, TString *n, expdesc *var) {
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int k = singlevar_aux(fs, n, var, 1);
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if (k == VNIL || k == VGLOBAL) { /* global? */
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if (var->k == VGLOBAL) /* free global? */
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var->info = luaK_stringK(fs, n);
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else { /* `indexed' global */
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expdesc e;
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codestring(fs->ls, &e, n);
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luaK_exp2anyreg(fs, var);
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var->aux = luaK_exp2RK(fs, &e);
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var->k = VINDEXED;
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}
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}
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}
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@ -250,29 +311,38 @@ static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
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static void code_params (LexState *ls, int nparams, int dots) {
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FuncState *fs = ls->fs;
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adjustlocalvars(ls, nparams);
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luaX_checklimit(ls, fs->nactloc, MAXPARAMS, "parameters");
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luaX_checklimit(ls, fs->nactvar, MAXPARAMS, "parameters");
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fs->f->numparams = cast(lu_byte, fs->nactloc);
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fs->f->is_vararg = cast(lu_byte, dots);
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if (dots) {
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new_localvarstr(ls, "arg", 0);
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adjustlocalvars(ls, 1);
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}
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if (dots)
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create_local(ls, "arg");
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luaK_reserveregs(fs, fs->nactloc); /* reserve register for parameters */
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}
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static void enterbreak (FuncState *fs, Breaklabel *bl) {
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static void enterblock (FuncState *fs, BlockCnt *bl, int isbreakable) {
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bl->breaklist = NO_JUMP;
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bl->isbreakable = isbreakable;
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bl->nactloc = fs->nactloc;
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bl->nactvar = fs->nactvar;
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bl->defaultglob = fs->defaultglob;
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bl->upval = 0;
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bl->previous = fs->bl;
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fs->bl = bl;
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}
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static void leavebreak (FuncState *fs, Breaklabel *bl) {
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static void leaveblock (FuncState *fs) {
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BlockCnt *bl = fs->bl;
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fs->bl = bl->previous;
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luaK_patchtohere(fs, bl->breaklist);
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removevars(fs->ls, bl->nactvar);
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if (bl->upval)
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luaK_codeABC(fs, OP_CLOSE, bl->nactloc, 0, 0);
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lua_assert(bl->nactloc == fs->nactloc);
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lua_assert(bl->nactvar == fs->nactvar);
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fs->defaultglob = bl->defaultglob;
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fs->freereg = bl->nactloc; /* free registers used by locals */
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luaK_patchtohere(fs, bl->breaklist);
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}
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@ -308,7 +378,9 @@ static void open_func (LexState *ls, FuncState *fs) {
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fs->nlineinfo = 0;
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fs->nlocvars = 0;
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fs->nactloc = 0;
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fs->nactvar = 0;
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fs->lastline = 0;
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fs->defaultglob = NO_REG; /* default is free globals */
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fs->bl = NULL;
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f->code = NULL;
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f->source = ls->source;
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@ -322,7 +394,7 @@ static void close_func (LexState *ls) {
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lua_State *L = ls->L;
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FuncState *fs = ls->fs;
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Proto *f = fs->f;
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removelocalvars(ls, fs->nactloc, 0);
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removevars(ls, 0);
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luaK_codeABC(fs, OP_RETURN, 0, 1, 0); /* final return */
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luaK_getlabel(fs); /* close eventual list of pending jumps */
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lua_assert(G(L)->roottable == fs->h);
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@ -352,8 +424,7 @@ Proto *luaY_parser (lua_State *L, ZIO *z) {
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open_func(&lexstate, &funcstate);
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next(&lexstate); /* read first token */
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chunk(&lexstate);
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check_condition(&lexstate, (lexstate.t.token == TK_EOS),
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"<eof> expected");
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check_condition(&lexstate, (lexstate.t.token == TK_EOS), "<eof> expected");
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close_func(&lexstate);
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lua_assert(funcstate.prev == NULL);
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lua_assert(funcstate.f->nupvalues == 0);
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@ -593,13 +664,13 @@ static void prefixexp (LexState *ls, expdesc *v) {
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return;
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}
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case TK_NAME: {
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singlevar(ls->fs, str_checkname(ls), v, 1);
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singlevar(ls->fs, str_checkname(ls), v);
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next(ls);
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return;
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}
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case '%': { /* for compatibility only */
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next(ls); /* skip `%' */
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singlevar(ls->fs, str_checkname(ls), v, 1);
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singlevar(ls->fs, str_checkname(ls), v);
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check_condition(ls, v->k == VUPVAL, "global upvalues are obsolete");
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next(ls);
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return;
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@ -797,10 +868,11 @@ static int block_follow (int token) {
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static void block (LexState *ls) {
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/* block -> chunk */
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FuncState *fs = ls->fs;
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int nactloc = fs->nactloc;
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BlockCnt bl;
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enterblock(fs, &bl, 0);
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chunk(ls);
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removelocalvars(ls, fs->nactloc - nactloc, 1);
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fs->freereg = nactloc; /* free registers used by locals */
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lua_assert(bl.breaklist == NO_JUMP);
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leaveblock(fs);
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}
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@ -887,8 +959,8 @@ static void whilestat (LexState *ls, int line) {
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FuncState *fs = ls->fs;
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int while_init = luaK_getlabel(fs);
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expdesc v;
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Breaklabel bl;
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enterbreak(fs, &bl);
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BlockCnt bl;
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enterblock(fs, &bl, 1);
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next(ls);
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cond(ls, &v);
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check(ls, TK_DO);
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@ -896,7 +968,7 @@ static void whilestat (LexState *ls, int line) {
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luaK_patchlist(fs, luaK_jump(fs), while_init);
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luaK_patchtohere(fs, v.f);
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check_match(ls, TK_END, TK_WHILE, line);
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leavebreak(fs, &bl);
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leaveblock(fs);
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}
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@ -905,14 +977,14 @@ static void repeatstat (LexState *ls, int line) {
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FuncState *fs = ls->fs;
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int repeat_init = luaK_getlabel(fs);
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expdesc v;
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Breaklabel bl;
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enterbreak(fs, &bl);
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BlockCnt bl;
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enterblock(fs, &bl, 1);
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next(ls);
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block(ls);
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check_match(ls, TK_UNTIL, TK_REPEAT, line);
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cond(ls, &v);
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luaK_patchlist(fs, v.f, repeat_init);
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leavebreak(fs, &bl);
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leaveblock(fs);
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}
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@ -949,7 +1021,6 @@ static void fornum (LexState *ls, TString *varname) {
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block(ls);
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luaK_patchtohere(fs, prep-1);
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luaK_patchlist(fs, luaK_codeAsBc(fs, OP_FORLOOP, base, NO_JUMP), prep);
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removelocalvars(ls, 3, 1);
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}
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@ -977,7 +1048,6 @@ static void forlist (LexState *ls, TString *indexname) {
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block(ls);
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luaK_patchlist(fs, luaK_jump(fs), prep-1);
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luaK_patchtohere(fs, prep);
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removelocalvars(ls, nvars+1, 1);
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}
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@ -985,8 +1055,8 @@ static void forstat (LexState *ls, int line) {
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/* forstat -> fornum | forlist */
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FuncState *fs = ls->fs;
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TString *varname;
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Breaklabel bl;
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enterbreak(fs, &bl);
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BlockCnt bl;
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enterblock(fs, &bl, 1);
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next(ls); /* skip `for' */
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varname = str_checkname(ls); /* first variable name */
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next(ls); /* skip var name */
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@ -996,7 +1066,7 @@ static void forstat (LexState *ls, int line) {
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default: luaK_error(ls, "`=' or `in' expected");
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}
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check_match(ls, TK_END, TK_FOR, line);
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leavebreak(fs, &bl);
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leaveblock(fs);
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}
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@ -1054,10 +1124,37 @@ static void localstat (LexState *ls) {
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}
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static void globalstat (LexState *ls) {
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/* stat -> GLOBAL NAME {`,' NAME} [IN exp] | GLOBAL IN exp */
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FuncState *fs = ls->fs;
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next(ls); /* skip GLOBAL */
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if (optional(ls, TK_IN)) { /* default declaration? */
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exp1(ls);
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fs->defaultglob = fs->freereg - 1;
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create_local(ls, "(global table)");
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}
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else {
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int nvars = 0;
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do {
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vardesc *v = new_var(ls, nvars++);
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v->i = luaK_stringK(ls->fs, str_checkname(ls));
|
||||
next(ls); /* skip name */
|
||||
} while (optional(ls, ','));
|
||||
if (!optional(ls, TK_IN))
|
||||
adjustglobalvars(ls, nvars, NO_REG); /* free globals */
|
||||
else {
|
||||
exp1(ls);
|
||||
adjustglobalvars(ls, nvars, ls->fs->freereg - 1);
|
||||
create_local(ls, "(global table)");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static int funcname (LexState *ls, expdesc *v) {
|
||||
/* funcname -> NAME {field} [`:' NAME] */
|
||||
int needself = 0;
|
||||
singlevar(ls->fs, str_checkname(ls), v, 1);
|
||||
singlevar(ls->fs, str_checkname(ls), v);
|
||||
next(ls); /* skip var name */
|
||||
while (ls->t.token == '.') {
|
||||
luaY_field(ls, v);
|
||||
@ -1125,11 +1222,17 @@ static void retstat (LexState *ls) {
|
||||
static void breakstat (LexState *ls) {
|
||||
/* stat -> BREAK [NAME] */
|
||||
FuncState *fs = ls->fs;
|
||||
Breaklabel *bl = fs->bl;
|
||||
BlockCnt *bl = fs->bl;
|
||||
int upval = 0;
|
||||
next(ls); /* skip BREAK */
|
||||
while (bl && !bl->isbreakable) {
|
||||
upval |= bl->upval;
|
||||
bl = bl->previous;
|
||||
}
|
||||
if (!bl)
|
||||
luaK_error(ls, "no loop to break");
|
||||
next(ls); /* skip BREAK */
|
||||
closelevel(ls, bl->nactloc);
|
||||
if (upval)
|
||||
luaK_codeABC(fs, OP_CLOSE, bl->nactloc, 0, 0);
|
||||
luaK_concat(fs, &bl->breaklist, luaK_jump(fs));
|
||||
}
|
||||
|
||||
@ -1167,6 +1270,10 @@ static int statement (LexState *ls) {
|
||||
localstat(ls);
|
||||
return 0;
|
||||
}
|
||||
case TK_GLOBAL: { /* stat -> globalstat */
|
||||
globalstat(ls);
|
||||
return 0;
|
||||
}
|
||||
case TK_RETURN: { /* stat -> retstat */
|
||||
retstat(ls);
|
||||
return 1; /* must be last statement */
|
||||
@ -1207,10 +1314,8 @@ static void body (LexState *ls, expdesc *e, int needself, int line) {
|
||||
open_func(ls, &new_fs);
|
||||
new_fs.f->lineDefined = line;
|
||||
check(ls, '(');
|
||||
if (needself) {
|
||||
new_localvarstr(ls, "self", 0);
|
||||
adjustlocalvars(ls, 1);
|
||||
}
|
||||
if (needself)
|
||||
create_local(ls, "self");
|
||||
parlist(ls);
|
||||
check(ls, ')');
|
||||
chunk(ls);
|
||||
|
||||
36
lparser.h
36
lparser.h
@ -1,5 +1,5 @@
|
||||
/*
|
||||
** $Id: lparser.h,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
|
||||
** $Id: lparser.h,v 1.39 2002/02/08 22:42:41 roberto Exp roberto $
|
||||
** Lua Parser
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -13,18 +13,6 @@
|
||||
#include "lzio.h"
|
||||
|
||||
|
||||
|
||||
/* small implementation of bit arrays */
|
||||
|
||||
#define BPW (CHAR_BIT*sizeof(unsigned int)) /* bits per word */
|
||||
|
||||
#define words2bits(b) (((b)-1)/BPW + 1)
|
||||
|
||||
#define setbit(a, b) ((a)[(b)/BPW] |= (1 << (b)%BPW))
|
||||
#define resetbit(a, b) ((a)[(b)/BPW] &= ~((1 << (b)%BPW)))
|
||||
#define testbit(a, b) ((a)[(b)/BPW] & (1 << (b)%BPW))
|
||||
|
||||
|
||||
/*
|
||||
** Expression descriptor
|
||||
*/
|
||||
@ -37,7 +25,7 @@ typedef enum {
|
||||
VK, /* info = index of constant in `k' */
|
||||
VLOCAL, /* info = local register */
|
||||
VUPVAL, /* info = index of upvalue in `upvalues' */
|
||||
VGLOBAL, /* info = index of global name in `k' */
|
||||
VGLOBAL, /* info = index of table; aux = index of global name in `k' */
|
||||
VINDEXED, /* info = table register; aux = index register (or `k') */
|
||||
VRELOCABLE, /* info = instruction pc */
|
||||
VNONRELOC, /* info = result register */
|
||||
@ -53,6 +41,18 @@ typedef struct expdesc {
|
||||
} expdesc;
|
||||
|
||||
|
||||
/* describe declared variables */
|
||||
typedef struct vardesc {
|
||||
int i; /* if local, its index in `locvars';
|
||||
if global, its name index in `k' */
|
||||
lu_byte k;
|
||||
lu_byte level; /* if local, stack level;
|
||||
if global, corresponding local (NO_REG for free globals) */
|
||||
} vardesc;
|
||||
|
||||
|
||||
struct BlockCnt; /* defined in lparser.c */
|
||||
|
||||
/* state needed to generate code for a given function */
|
||||
typedef struct FuncState {
|
||||
Proto *f; /* current function header */
|
||||
@ -60,21 +60,21 @@ typedef struct FuncState {
|
||||
struct FuncState *prev; /* enclosing function */
|
||||
struct LexState *ls; /* lexical state */
|
||||
struct lua_State *L; /* copy of the Lua state */
|
||||
struct Breaklabel *bl; /* chain of breakable blocks */
|
||||
struct BlockCnt *bl; /* chain of current blocks */
|
||||
int pc; /* next position to code (equivalent to `ncode') */
|
||||
int lasttarget; /* `pc' of last `jump target' */
|
||||
int jlt; /* list of jumps to `lasttarget' */
|
||||
int freereg; /* first free register */
|
||||
int defaultglob; /* where to look for non-declared globals */
|
||||
int nk; /* number of elements in `k' */
|
||||
int np; /* number of elements in `p' */
|
||||
int nlineinfo; /* number of elements in `lineinfo' */
|
||||
int nlocvars; /* number of elements in `locvars' */
|
||||
int nactloc; /* number of active local variables */
|
||||
int nactvar; /* number of elements in array `actvar' */
|
||||
int lastline; /* line where last `lineinfo' was generated */
|
||||
expdesc upvalues[MAXUPVALUES]; /* upvalues */
|
||||
int actloc[MAXLOCALS]; /* local-variable stack (indices to locvars) */
|
||||
unsigned int wasup[words2bits(MAXLOCALS)]; /* bit array to mark whether a
|
||||
local variable was used as upvalue at some level */
|
||||
vardesc actvar[MAXVARS]; /* declared-variable stack */
|
||||
} FuncState;
|
||||
|
||||
|
||||
|
||||
4
ltests.c
4
ltests.c
@ -1,5 +1,5 @@
|
||||
/*
|
||||
** $Id: ltests.c,v 1.110 2002/03/04 15:26:56 roberto Exp roberto $
|
||||
** $Id: ltests.c,v 1.111 2002/03/04 21:29:41 roberto Exp roberto $
|
||||
** Internal Module for Debugging of the Lua Implementation
|
||||
** See Copyright Notice in lua.h
|
||||
*/
|
||||
@ -219,7 +219,7 @@ static int get_limits (lua_State *L) {
|
||||
lua_newtable(L);
|
||||
setnameval(L, "BITS_INT", BITS_INT);
|
||||
setnameval(L, "LFPF", LFIELDS_PER_FLUSH);
|
||||
setnameval(L, "MAXLOCALS", MAXLOCALS);
|
||||
setnameval(L, "MAXVARS", MAXVARS);
|
||||
setnameval(L, "MAXPARAMS", MAXPARAMS);
|
||||
setnameval(L, "MAXSTACK", MAXSTACK);
|
||||
setnameval(L, "MAXUPVALUES", MAXUPVALUES);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user