mirror of
https://github.com/lua/lua
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87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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** $Id: lparser.h,v 1.6 2000/02/22 13:30:11 roberto Exp roberto $
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** LL(1) Parser and code generator for Lua
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** See Copyright Notice in lua.h
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*/
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#ifndef lparser_h
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#define lparser_h
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#include "lobject.h"
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#include "lopcodes.h"
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#include "lzio.h"
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/* maximum number of local variables */
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#ifndef MAXLOCALS
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#define MAXLOCALS 200 /* arbitrary limit (<=MAXARG_B) */
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#endif
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/* maximum number of upvalues */
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#ifndef MAXUPVALUES
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#define MAXUPVALUES 32 /* arbitrary limit (<=MAXARG_B) */
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#endif
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/* maximum number of variables in the left side of an assignment */
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#ifndef MAXVARSLH
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#define MAXVARSLH 100 /* arbitrary limit (<=MAXARG_B) */
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#endif
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/* maximum number of parameters in a function */
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#ifndef MAXPARAMS
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#define MAXPARAMS 100 /* arbitrary limit (<=MAXLOCALS) */
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#endif
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/* maximum stack size in a function */
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#ifndef MAXSTACK
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#define MAXSTACK 256 /* arbitrary limit (<=MAXARG_A) */
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#endif
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#if MAXLOCALS>MAXARG_U || MAXUPVALUES>MAXARG_B || MAXVARSLH>MAXARG_B || \
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MAXPARAMS>MAXLOCALS || MAXSTACK>MAXARG_A || LFIELDS_PER_FLUSH>MAXARG_B
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#error invalid limits
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#endif
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/*
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** Expression descriptor
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*/
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typedef enum {
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VGLOBAL, /* info is constant index of global name */
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VLOCAL, /* info is stack index */
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VINDEXED, /* no info (table and index are on the stack) */
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VEXP /* info is pc index of exp main operator */
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} expkind;
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typedef struct expdesc {
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expkind k;
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int info;
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} expdesc;
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/* state needed to generate code for a given function */
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typedef struct FuncState {
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TProtoFunc *f; /* current function header */
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struct FuncState *prev; /* enclosing function */
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int pc; /* next position to code */
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int last_pc; /* last instruction coded (for optimizations) */
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int stacksize; /* number of values on activation register */
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int nlocalvar; /* number of active local variables */
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int nupvalues; /* number of upvalues */
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int nvars; /* number of entries in f->locvars (-1 if no debug information) */
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int lastsetline; /* line where last SETLINE was issued */
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expdesc upvalues[MAXUPVALUES]; /* upvalues */
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TaggedString *localvar[MAXLOCALS]; /* store local variable names */
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} FuncState;
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TProtoFunc *luaY_parser (lua_State *L, ZIO *z);
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#endif
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