mirror of
https://github.com/lua/lua
synced 2024-11-26 22:59:35 +03:00
844 lines
18 KiB
Plaintext
844 lines
18 KiB
Plaintext
%{
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char *rcs_luastx = "$Id: lua.stx,v 3.50 1997/07/31 20:46:59 roberto Exp roberto $";
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#include <stdlib.h>
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#include "luadebug.h"
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#include "luamem.h"
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#include "lex.h"
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#include "opcode.h"
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#include "hash.h"
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#include "inout.h"
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#include "tree.h"
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#include "table.h"
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#include "lua.h"
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#include "func.h"
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/* to avoid warnings generated by yacc */
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int yyparse (void);
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#define malloc luaI_malloc
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#define realloc luaI_realloc
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#define free luaI_free
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#ifndef LISTING
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#define LISTING 0
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#endif
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#ifndef CODE_BLOCK
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#define CODE_BLOCK 1000
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#endif
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#define MAXLOCALS 32
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/* state needed to generate code for a given function */
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struct State {
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TFunc *f; /* current function header */
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int codesize;
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int pc; /* next position to code */
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TaggedString *localvar[MAXLOCALS]; /* store local variable names */
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int nlocalvar; /* number of active local variables */
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int maxconsts; /* size of consts vector */
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int nvars; /* total number of local variables (for debugging information) */
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int maxvars; /* = -1 if no debug information */
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} stateMain, stateFunc, *currState;
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#define MAXVAR 32
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static Long varbuffer[MAXVAR]; /* variables in an assignment list;
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it's long to store negative Word values */
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static int nvarbuffer=0; /* number of variables at a list */
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int lua_debug = 0;
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/* Internal functions */
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static void yyerror (char *s)
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{
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luaI_syntaxerror(s);
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}
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static void check_space (int i)
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{
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if (currState->pc+i >= currState->codesize)
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currState->codesize = growvector(&currState->f->code, currState->codesize,
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Byte, codeEM, MAX_INT);
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}
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static void code_byte (Byte c)
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{
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check_space(1);
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currState->f->code[currState->pc++] = c;
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}
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static void code_word_at (int pc, int n)
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{
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Word w = n;
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if (w != n)
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yyerror("block too big");
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currState->f->code[pc] = n&0xFF;
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currState->f->code[pc+1] = n>>8;
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}
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static void code_word (int n)
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{
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code_byte(n&0xFF);
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code_byte(n>>8);
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}
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static void code_constant (int c)
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{
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if (c <= 255) {
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code_byte(PUSHCONSTANTB);
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code_byte(c);
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}
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else {
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code_byte(PUSHCONSTANT);
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code_word(c);
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}
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}
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static int next_constant (void)
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{
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TFunc *f = currState->f;
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if (f->nconsts >= currState->maxconsts) {
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currState->maxconsts =
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growvector(&f->consts, currState->maxconsts, TObject,
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constantEM, MAX_WORD);
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}
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return f->nconsts++;
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}
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static int string_constant (TaggedString *s)
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{
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TFunc *f = currState->f;
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int c = s->u.s.constindex;
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if (!(0 <= c && c < f->nconsts &&
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ttype(&f->consts[c]) == LUA_T_STRING && tsvalue(&f->consts[c]) == s)) {
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c = next_constant();
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ttype(&f->consts[c]) = LUA_T_STRING;
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tsvalue(&f->consts[c]) = s;
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s->u.s.constindex = c; /* hint for next time */
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}
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luaI_releasestring(s);
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return c;
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}
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static void code_string (TaggedString *s)
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{
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code_constant(string_constant(s));
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}
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#define LIM 10
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static int real_constant (real r)
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{
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/* check whether 'r' has appeared within the last LIM entries */
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TObject *cnt = currState->f->consts;
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int c = currState->f->nconsts;
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int lim = c < LIM ? 0 : c-LIM;
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while (--c >= lim) {
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if (ttype(&cnt[c]) == LUA_T_NUMBER && nvalue(&cnt[c]) == r)
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return c;
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}
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/* not found; create a new entry */
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c = next_constant();
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cnt = currState->f->consts; /* 'next_constant' may reallocate this vector */
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ttype(&cnt[c]) = LUA_T_NUMBER;
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nvalue(&cnt[c]) = r;
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return c;
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}
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static void code_number (real f)
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{
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Word i;
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if (f >= 0 && f <= (real)MAX_WORD && (real)(i=(Word)f) == f) {
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/* f has an (short) integer value */
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if (i <= 2) code_byte(PUSH0 + i);
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else if (i <= 255) {
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code_byte(PUSHBYTE);
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code_byte(i);
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}
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else {
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code_byte(PUSHWORD);
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code_word(i);
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}
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}
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else
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code_constant(real_constant(f));
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}
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static void flush_record (int n)
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{
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if (n == 0) return;
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code_byte(STOREMAP);
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code_byte(n);
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}
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static void flush_list (int m, int n)
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{
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if (n == 0) return;
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if (m == 0)
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code_byte(STORELIST0);
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else
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if (m < 255)
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{
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code_byte(STORELIST);
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code_byte(m);
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}
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else
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yyerror ("list constructor too long");
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code_byte(n);
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}
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static void luaI_registerlocalvar (TaggedString *varname, int line)
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{
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if (currState->maxvars != -1) { /* debug information? */
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if (currState->nvars >= currState->maxvars)
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currState->maxvars = growvector(&currState->f->locvars,
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currState->maxvars, LocVar, "", MAX_WORD);
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currState->f->locvars[currState->nvars].varname = varname;
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currState->f->locvars[currState->nvars].line = line;
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currState->nvars++;
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}
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}
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static void luaI_unregisterlocalvar (int line)
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{
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luaI_registerlocalvar(NULL, line);
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}
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static void store_localvar (TaggedString *name, int n)
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{
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luaI_fixstring(name); /* local var names cannot be GC */
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if (currState->nlocalvar+n < MAXLOCALS)
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currState->localvar[currState->nlocalvar+n] = name;
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else
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yyerror ("too many local variables");
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luaI_registerlocalvar(name, lua_linenumber);
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}
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static void add_localvar (TaggedString *name)
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{
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store_localvar(name, 0);
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currState->nlocalvar++;
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}
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static void add_varbuffer (Long var)
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{
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if (nvarbuffer < MAXVAR)
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varbuffer[nvarbuffer++] = var;
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else
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yyerror ("variable buffer overflow");
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}
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/*
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** Search a local name and if find return its index. If do not find return -1
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*/
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static int lua_localname (TaggedString *n)
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{
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int i;
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for (i=currState->nlocalvar-1; i >= 0; i--)
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if (n == currState->localvar[i]) return i; /* local var */
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return -1; /* global var */
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}
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/*
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** Push a variable given a number. If number is positive, push global variable
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** indexed by (number -1). If negative, push local indexed by ABS(number)-1.
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** Otherwise, if zero, push indexed variable (record).
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*/
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static void lua_pushvar (Long number)
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{
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if (number > 0) /* global var */
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{
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code_byte(PUSHGLOBAL);
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code_word(number-1);
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}
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else if (number < 0) /* local var */
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{
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number = (-number) - 1;
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if (number < 10) code_byte(PUSHLOCAL0 + number);
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else
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{
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code_byte(PUSHLOCAL);
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code_byte(number);
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}
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}
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else
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{
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code_byte(PUSHINDEXED);
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}
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}
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static void lua_codeadjust (int n)
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{
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n += currState->nlocalvar;
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if (n == 0)
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code_byte(ADJUST0);
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else {
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code_byte(ADJUST);
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code_byte(n);
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}
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}
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void luaI_codedebugline (int line)
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{
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static int lastline = 0;
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if (lua_debug && line != lastline)
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{
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code_byte(SETLINE);
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code_word(line);
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lastline = line;
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}
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}
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static int adjust_functioncall (Long exp, int i)
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{
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if (exp <= 0)
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return -exp; /* exp is -list length */
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else {
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int temp = currState->f->code[exp];
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currState->f->code[exp] = i;
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return temp+i;
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}
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}
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static void adjust_mult_assign (int vars, Long exps, int temps)
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{
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if (exps > 0) { /* must correct function call */
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int diff = vars - currState->f->code[exps];
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if (diff >= 0)
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adjust_functioncall(exps, diff);
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else {
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adjust_functioncall(exps, 0);
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lua_codeadjust(temps);
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}
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}
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else if (vars != -exps)
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lua_codeadjust(temps);
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}
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static int close_parlist (int dots)
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{
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if (!dots)
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lua_codeadjust(0);
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else {
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code_byte(VARARGS);
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code_byte(currState->nlocalvar);
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add_localvar(luaI_createstring("arg"));
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}
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return lua_linenumber;
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}
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static void storesinglevar (Long v)
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{
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if (v > 0) /* global var */
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{
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code_byte(STOREGLOBAL);
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code_word(v-1);
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}
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else if (v < 0) /* local var */
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{
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int number = (-v) - 1;
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if (number < 10) code_byte(STORELOCAL0 + number);
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else
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{
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code_byte(STORELOCAL);
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code_byte(number);
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}
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}
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else
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code_byte(STOREINDEXED0);
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}
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static void lua_codestore (int i)
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{
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if (varbuffer[i] != 0) /* global or local var */
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storesinglevar(varbuffer[i]);
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else /* indexed var */
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{
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int j;
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int upper=0; /* number of indexed variables upper */
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int param; /* number of itens until indexed expression */
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for (j=i+1; j <nvarbuffer; j++)
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if (varbuffer[j] == 0) upper++;
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param = upper*2 + i;
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if (param == 0)
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code_byte(STOREINDEXED0);
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else
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{
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code_byte(STOREINDEXED);
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code_byte(param);
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}
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}
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}
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static void codeIf (Long thenAdd, Long elseAdd)
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{
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Long elseinit = elseAdd+sizeof(Word)+1;
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if (currState->pc == elseinit) { /* no else */
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currState->pc -= sizeof(Word)+1;
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elseinit = currState->pc;
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}
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else {
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currState->f->code[elseAdd] = JMP;
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code_word_at(elseAdd+1, currState->pc-elseinit);
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}
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currState->f->code[thenAdd] = IFFJMP;
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code_word_at(thenAdd+1, elseinit-(thenAdd+sizeof(Word)+1));
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}
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static void code_shortcircuit (int pc, Byte jmp)
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{
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currState->f->code[pc] = jmp;
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code_word_at(pc+1, currState->pc - (pc + sizeof(Word)+1));
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}
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static void init_state (TFunc *f)
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{
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currState->nlocalvar = 0;
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currState->f = f;
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currState->pc = 0;
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currState->codesize = CODE_BLOCK;
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f->code = newvector(CODE_BLOCK, Byte);
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currState->maxconsts = 0;
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if (lua_debug) {
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currState->nvars = 0;
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currState->maxvars = 0;
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}
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else
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currState->maxvars = -1; /* flag no debug information */
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}
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static void init_func (Long v)
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{
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TFunc *f = new(TFunc);
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int c = next_constant();
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ttype(&currState->f->consts[c]) = LUA_T_FUNCTION;
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currState->f->consts[c].value.tf = f;
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code_constant(c);
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storesinglevar(v);
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currState = &stateFunc;
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luaI_initTFunc(f);
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init_state(f);
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luaI_codedebugline(lua_linenumber);
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}
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static void codereturn (void)
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{
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if (currState->nlocalvar == 0)
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code_byte(RETCODE0);
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else
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{
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code_byte(RETCODE);
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code_byte(currState->nlocalvar);
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}
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}
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static void close_func (void)
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{
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codereturn();
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code_byte(ENDCODE);
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currState->f->code = shrinkvector(currState->f->code, currState->pc, Byte);
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currState->f->consts = shrinkvector(currState->f->consts,
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currState->f->nconsts, TObject);
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if (currState->maxvars != -1) { /* debug information? */
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luaI_registerlocalvar(NULL, -1); /* flag end of vector */
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currState->f->locvars = shrinkvector(currState->f->locvars,
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currState->nvars, LocVar);
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}
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}
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/*
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** Parse LUA code.
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*/
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void lua_parse (TFunc *tf)
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{
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currState = &stateMain;
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init_state(tf);
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if (yyparse ()) lua_error("parse error");
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currState = &stateMain;
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close_func();
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}
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%}
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%union
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{
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int vInt;
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real vReal;
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char *pChar;
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Long vLong;
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TaggedString *pTStr;
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}
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%start chunk
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%token WRONGTOKEN
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%token NIL
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%token IF THEN ELSE ELSEIF WHILE DO REPEAT UNTIL END
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%token RETURN
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%token LOCAL
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%token FUNCTION
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%token DOTS
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%token <vReal> NUMBER
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%token <pTStr> NAME STRING
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%type <vLong> PrepJump
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%type <vLong> exprlist, exprlist1 /* if > 0, points to function return
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counter (which has list length); if <= 0, -list lenght */
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%type <vLong> functioncall, expr /* if != 0, points to function return
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counter */
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%type <vInt> varlist1, funcParams, funcvalue
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%type <vInt> fieldlist, localdeclist, decinit
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%type <vInt> ffieldlist, ffieldlist1, semicolonpart
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%type <vInt> lfieldlist, lfieldlist1
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%type <vInt> parlist, parlist1, par
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%type <vLong> var, singlevar
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%left AND OR
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%left EQ NE '>' '<' LE GE
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%left CONC
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%left '+' '-'
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%left '*' '/'
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%left UNARY NOT
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%right '^'
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%% /* beginning of rules section */
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chunk : chunklist ret ;
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chunklist : /* empty */
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| chunklist stat sc
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| chunklist function
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;
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function : FUNCTION funcname body
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;
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funcname : var { init_func($1); }
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| varexp ':' NAME
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{
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code_string($3);
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init_func(0); /* indexed variable */
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add_localvar(luaI_createstring("self"));
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}
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;
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body : '(' parlist ')' block END
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{
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close_func();
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currState->f->lineDefined = $2;
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currState = &stateMain; /* change back to main code */
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}
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;
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statlist : /* empty */
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| statlist stat sc
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;
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sc : /* empty */ | ';' ;
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stat : IF expr1 THEN PrepJump block PrepJump elsepart END
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{ codeIf($4, $6); }
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|
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| WHILE {$<vLong>$=currState->pc;} expr1 DO PrepJump block PrepJump END
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{
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currState->f->code[$5] = IFFJMP;
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code_word_at($5+1, currState->pc - ($5+sizeof(Word)+1));
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currState->f->code[$7] = UPJMP;
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code_word_at($7+1, currState->pc - ($<vLong>2));
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}
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|
|
|
| REPEAT {$<vLong>$=currState->pc;} block UNTIL expr1 PrepJump
|
|
{
|
|
currState->f->code[$6] = IFFUPJMP;
|
|
code_word_at($6+1, currState->pc - ($<vLong>2));
|
|
}
|
|
|
|
| varlist1 '=' exprlist1
|
|
{
|
|
{
|
|
int i;
|
|
adjust_mult_assign(nvarbuffer, $3, $1 * 2 + nvarbuffer);
|
|
for (i=nvarbuffer-1; i>=0; i--)
|
|
lua_codestore(i);
|
|
if ($1 > 1 || ($1 == 1 && varbuffer[0] != 0))
|
|
lua_codeadjust(0);
|
|
}
|
|
}
|
|
| functioncall {;}
|
|
| LOCAL localdeclist decinit
|
|
{ currState->nlocalvar += $2;
|
|
adjust_mult_assign($2, $3, 0);
|
|
}
|
|
;
|
|
|
|
elsepart : /* empty */
|
|
| ELSE block
|
|
| ELSEIF expr1 THEN PrepJump block PrepJump elsepart
|
|
{ codeIf($4, $6); }
|
|
;
|
|
|
|
block : {$<vInt>$ = currState->nlocalvar;} statlist ret
|
|
{
|
|
if (currState->nlocalvar != $<vInt>1) {
|
|
for (; currState->nlocalvar > $<vInt>1; currState->nlocalvar--)
|
|
luaI_unregisterlocalvar(lua_linenumber);
|
|
lua_codeadjust(0);
|
|
}
|
|
}
|
|
;
|
|
|
|
ret : /* empty */
|
|
| RETURN exprlist sc
|
|
{
|
|
adjust_functioncall($2, MULT_RET);
|
|
codereturn();
|
|
}
|
|
;
|
|
|
|
PrepJump : /* empty */
|
|
{
|
|
$$ = currState->pc;
|
|
code_byte(0); /* open space */
|
|
code_word(0);
|
|
}
|
|
;
|
|
|
|
expr1 : expr { adjust_functioncall($1, 1); }
|
|
;
|
|
|
|
expr : '(' expr ')' { $$ = $2; }
|
|
| expr1 EQ expr1 { code_byte(EQOP); $$ = 0; }
|
|
| expr1 '<' expr1 { code_byte(LTOP); $$ = 0; }
|
|
| expr1 '>' expr1 { code_byte(GTOP); $$ = 0; }
|
|
| expr1 NE expr1 { code_byte(EQOP); code_byte(NOTOP); $$ = 0; }
|
|
| expr1 LE expr1 { code_byte(LEOP); $$ = 0; }
|
|
| expr1 GE expr1 { code_byte(GEOP); $$ = 0; }
|
|
| expr1 '+' expr1 { code_byte(ADDOP); $$ = 0; }
|
|
| expr1 '-' expr1 { code_byte(SUBOP); $$ = 0; }
|
|
| expr1 '*' expr1 { code_byte(MULTOP); $$ = 0; }
|
|
| expr1 '/' expr1 { code_byte(DIVOP); $$ = 0; }
|
|
| expr1 '^' expr1 { code_byte(POWOP); $$ = 0; }
|
|
| expr1 CONC expr1 { code_byte(CONCOP); $$ = 0; }
|
|
| '-' expr1 %prec UNARY { code_byte(MINUSOP); $$ = 0;}
|
|
| table { $$ = 0; }
|
|
| varexp { $$ = 0;}
|
|
| NUMBER { code_number($1); $$ = 0; }
|
|
| STRING
|
|
{
|
|
code_string($1);
|
|
$$ = 0;
|
|
}
|
|
| NIL {code_byte(PUSHNIL); $$ = 0; }
|
|
| functioncall { $$ = $1; }
|
|
| NOT expr1 { code_byte(NOTOP); $$ = 0;}
|
|
| expr1 AND PrepJump expr1
|
|
{
|
|
code_shortcircuit($3, ONFJMP);
|
|
$$ = 0;
|
|
}
|
|
| expr1 OR PrepJump expr1
|
|
{
|
|
code_shortcircuit($3, ONTJMP);
|
|
$$ = 0;
|
|
}
|
|
;
|
|
|
|
table :
|
|
{
|
|
code_byte(CREATEARRAY);
|
|
$<vLong>$ = currState->pc; code_word(0);
|
|
}
|
|
'{' fieldlist '}'
|
|
{
|
|
code_word_at($<vLong>1, $3);
|
|
}
|
|
;
|
|
|
|
functioncall : funcvalue funcParams
|
|
{
|
|
code_byte(CALLFUNC);
|
|
code_byte($1+$2);
|
|
$$ = currState->pc;
|
|
code_byte(0); /* may be modified by other rules */
|
|
}
|
|
;
|
|
|
|
funcvalue : varexp { $$ = 0; }
|
|
| varexp ':' NAME
|
|
{
|
|
code_byte(PUSHSELF);
|
|
code_word(string_constant($3));
|
|
$$ = 1;
|
|
}
|
|
;
|
|
|
|
funcParams : '(' exprlist ')'
|
|
{ $$ = adjust_functioncall($2, 1); }
|
|
| table { $$ = 1; }
|
|
;
|
|
|
|
exprlist : /* empty */ { $$ = 0; }
|
|
| exprlist1 { $$ = $1; }
|
|
;
|
|
|
|
exprlist1 : expr { if ($1 != 0) $$ = $1; else $$ = -1; }
|
|
| exprlist1 ',' { $<vLong>$ = adjust_functioncall($1, 1); } expr
|
|
{
|
|
if ($4 == 0) $$ = -($<vLong>3 + 1); /* -length */
|
|
else
|
|
{
|
|
adjust_functioncall($4, $<vLong>3);
|
|
$$ = $4;
|
|
}
|
|
}
|
|
;
|
|
|
|
parlist : /* empty */ { $$ = close_parlist(0); }
|
|
| parlist1 { $$ = close_parlist($1); }
|
|
;
|
|
|
|
parlist1 : par { $$ = $1; }
|
|
| parlist1 ',' par
|
|
{
|
|
if ($1)
|
|
lua_error("invalid parameter list");
|
|
$$ = $3;
|
|
}
|
|
;
|
|
|
|
par : NAME { add_localvar($1); $$ = 0; }
|
|
| DOTS { $$ = 1; }
|
|
;
|
|
|
|
fieldlist : lfieldlist
|
|
{ flush_list($1/FIELDS_PER_FLUSH, $1%FIELDS_PER_FLUSH); }
|
|
semicolonpart
|
|
{ $$ = $1+$3; }
|
|
| ffieldlist1 lastcomma
|
|
{ $$ = $1; flush_record($1%FIELDS_PER_FLUSH); }
|
|
;
|
|
|
|
semicolonpart : /* empty */
|
|
{ $$ = 0; }
|
|
| ';' ffieldlist
|
|
{ $$ = $2; flush_record($2%FIELDS_PER_FLUSH); }
|
|
;
|
|
|
|
lastcomma : /* empty */
|
|
| ','
|
|
;
|
|
|
|
ffieldlist : /* empty */ { $$ = 0; }
|
|
| ffieldlist1 lastcomma { $$ = $1; }
|
|
;
|
|
|
|
ffieldlist1 : ffield {$$=1;}
|
|
| ffieldlist1 ',' ffield
|
|
{
|
|
$$=$1+1;
|
|
if ($$%FIELDS_PER_FLUSH == 0) flush_record(FIELDS_PER_FLUSH);
|
|
}
|
|
;
|
|
|
|
ffield : ffieldkey '=' expr1
|
|
;
|
|
|
|
ffieldkey : '[' expr1 ']'
|
|
| NAME { code_string($1); }
|
|
;
|
|
|
|
lfieldlist : /* empty */ { $$ = 0; }
|
|
| lfieldlist1 lastcomma { $$ = $1; }
|
|
;
|
|
|
|
lfieldlist1 : expr1 {$$=1;}
|
|
| lfieldlist1 ',' expr1
|
|
{
|
|
$$=$1+1;
|
|
if ($$%FIELDS_PER_FLUSH == 0)
|
|
flush_list($$/FIELDS_PER_FLUSH - 1, FIELDS_PER_FLUSH);
|
|
}
|
|
;
|
|
|
|
varlist1 : var
|
|
{
|
|
nvarbuffer = 0;
|
|
add_varbuffer($1);
|
|
$$ = ($1 == 0) ? 1 : 0;
|
|
}
|
|
| varlist1 ',' var
|
|
{
|
|
add_varbuffer($3);
|
|
$$ = ($3 == 0) ? $1 + 1 : $1;
|
|
}
|
|
;
|
|
|
|
var : singlevar { $$ = $1; }
|
|
| varexp '[' expr1 ']'
|
|
{
|
|
$$ = 0; /* indexed variable */
|
|
}
|
|
| varexp '.' NAME
|
|
{
|
|
code_string($3);
|
|
$$ = 0; /* indexed variable */
|
|
}
|
|
;
|
|
|
|
singlevar : NAME
|
|
{
|
|
int local = lua_localname($1);
|
|
if (local == -1) /* global var */
|
|
$$ = luaI_findsymbol($1)+1; /* return positive value */
|
|
else
|
|
$$ = -(local+1); /* return negative value */
|
|
luaI_fixstring($1); /* cannot GC variable names */
|
|
}
|
|
;
|
|
|
|
varexp : var { lua_pushvar($1); }
|
|
;
|
|
|
|
localdeclist : NAME {store_localvar($1, 0); $$ = 1;}
|
|
| localdeclist ',' NAME
|
|
{
|
|
store_localvar($3, $1);
|
|
$$ = $1+1;
|
|
}
|
|
;
|
|
|
|
decinit : /* empty */ { $$ = 0; }
|
|
| '=' exprlist1 { $$ = $2; }
|
|
;
|
|
|
|
%%
|