Lua2RTT/lua-5.3.4/ldump.c

/*
** $Id: ldump.c,v 2.37 2015/10/08 15:53:49 roberto Exp $
** save precompiled Lua chunks
** See Copyright Notice in lua.h
*/

#define ldump_c
#define LUA_CORE

#include "lprefix.h"


#include <stddef.h>

#include "lua.h"

#include "lobject.h"
#include "lstate.h"
#include "lundump.h"


typedef struct
{
    lua_State *L;
    lua_Writer writer;
    void *data;
    int strip;
    int status;
} DumpState;


/*
** All high-level dumps go through DumpVector; you can change it to
** change the endianness of the result
*/
#define DumpVector(v,n,D)   DumpBlock(v,(n)*sizeof((v)[0]),D)

#define DumpLiteral(s,D)    DumpBlock(s, sizeof(s) - sizeof(char), D)


static void DumpBlock(const void *b, size_t size, DumpState *D)
{
    if (D->status == 0 && size > 0)
    {
        lua_unlock(D->L);
        D->status = (*D->writer)(D->L, b, size, D->data);
        lua_lock(D->L);
    }
}


#define DumpVar(x,D)        DumpVector(&x,1,D)


static void DumpByte(int y, DumpState *D)
{
    lu_byte x = (lu_byte)y;
    DumpVar(x, D);
}


static void DumpInt(int x, DumpState *D)
{
    DumpVar(x, D);
}


static void DumpNumber(lua_Number x, DumpState *D)
{
    DumpVar(x, D);
}


static void DumpInteger(lua_Integer x, DumpState *D)
{
    DumpVar(x, D);
}


static void DumpString(const TString *s, DumpState *D)
{
    if (s == NULL)
        DumpByte(0, D);
    else
    {
        size_t size = tsslen(s) + 1;  /* include trailing '\0' */
        const char *str = getstr(s);
        if (size < 0xFF)
            DumpByte(cast_int(size), D);
        else
        {
            DumpByte(0xFF, D);
            DumpVar(size, D);
        }
        DumpVector(str, size - 1, D);  /* no need to save '\0' */
    }
}


static void DumpCode(const Proto *f, DumpState *D)
{
    DumpInt(f->sizecode, D);
    DumpVector(f->code, f->sizecode, D);
}


static void DumpFunction(const Proto *f, TString *psource, DumpState *D);

static void DumpConstants(const Proto *f, DumpState *D)
{
    int i;
    int n = f->sizek;
    DumpInt(n, D);
    for (i = 0; i < n; i++)
    {
        const TValue *o = &f->k[i];
        DumpByte(ttype(o), D);
        switch (ttype(o))
        {
        case LUA_TNIL:
            break;
        case LUA_TBOOLEAN:
            DumpByte(bvalue(o), D);
            break;
        case LUA_TNUMFLT:
            DumpNumber(fltvalue(o), D);
            break;
        case LUA_TNUMINT:
            DumpInteger(ivalue(o), D);
            break;
        case LUA_TSHRSTR:
        case LUA_TLNGSTR:
            DumpString(tsvalue(o), D);
            break;
        default:
            lua_assert(0);
        }
    }
}


static void DumpProtos(const Proto *f, DumpState *D)
{
    int i;
    int n = f->sizep;
    DumpInt(n, D);
    for (i = 0; i < n; i++)
        DumpFunction(f->p[i], f->source, D);
}


static void DumpUpvalues(const Proto *f, DumpState *D)
{
    int i, n = f->sizeupvalues;
    DumpInt(n, D);
    for (i = 0; i < n; i++)
    {
        DumpByte(f->upvalues[i].instack, D);
        DumpByte(f->upvalues[i].idx, D);
    }
}


static void DumpDebug(const Proto *f, DumpState *D)
{
    int i, n;
    n = (D->strip) ? 0 : f->sizelineinfo;
    DumpInt(n, D);
    DumpVector(f->lineinfo, n, D);
    n = (D->strip) ? 0 : f->sizelocvars;
    DumpInt(n, D);
    for (i = 0; i < n; i++)
    {
        DumpString(f->locvars[i].varname, D);
        DumpInt(f->locvars[i].startpc, D);
        DumpInt(f->locvars[i].endpc, D);
    }
    n = (D->strip) ? 0 : f->sizeupvalues;
    DumpInt(n, D);
    for (i = 0; i < n; i++)
        DumpString(f->upvalues[i].name, D);
}


static void DumpFunction(const Proto *f, TString *psource, DumpState *D)
{
    if (D->strip || f->source == psource)
        DumpString(NULL, D);  /* no debug info or same source as its parent */
    else
        DumpString(f->source, D);
    DumpInt(f->linedefined, D);
    DumpInt(f->lastlinedefined, D);
    DumpByte(f->numparams, D);
    DumpByte(f->is_vararg, D);
    DumpByte(f->maxstacksize, D);
    DumpCode(f, D);
    DumpConstants(f, D);
    DumpUpvalues(f, D);
    DumpProtos(f, D);
    DumpDebug(f, D);
}


static void DumpHeader(DumpState *D)
{
    DumpLiteral(LUA_SIGNATURE, D);
    DumpByte(LUAC_VERSION, D);
    DumpByte(LUAC_FORMAT, D);
    DumpLiteral(LUAC_DATA, D);
    DumpByte(sizeof(int), D);
    DumpByte(sizeof(size_t), D);
    DumpByte(sizeof(Instruction), D);
    DumpByte(sizeof(lua_Integer), D);
    DumpByte(sizeof(lua_Number), D);
    DumpInteger(LUAC_INT, D);
    DumpNumber(LUAC_NUM, D);
}


/*
** dump Lua function as precompiled chunk
*/
int luaU_dump(lua_State *L, const Proto *f, lua_Writer w, void *data,
              int strip)
{
    DumpState D;
    D.L = L;
    D.writer = w;
    D.data = data;
    D.strip = strip;
    D.status = 0;
    DumpHeader(&D);
    DumpByte(f->sizeupvalues, &D);
    DumpFunction(f, NULL, &D);
    return D.status;
}