lua55c/src/lundump.c at main · 2MoonsLua/lua55c · GitHub

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** $Id: lundump.c $

** load precompiled Lua chunks

** See Copyright Notice in lua.h

#define lundump_c

#define LUA_CORE

#include "lprefix.h"

#include <limits.h>

#include <string.h>

#include "lua.h"

#include "ldebug.h"

#include "ldo.h"

#include "lfunc.h"

#include "lmem.h"

#include "lobject.h"

#include "lstring.h"

#include "ltable.h"

#include "lundump.h"

#include "lzio.h"

#if !defined(luai_verifycode)

#define luai_verifycode(L,f) /* empty */

#endif

typedef struct {

lua_State *L;

ZIO *Z;

const char *name;

Table *h; /* list for string reuse */

size_t offset; /* current position relative to beginning of dump */

lua_Unsigned nstr; /* number of strings in the list */

lu_byte fixed; /* dump is fixed in memory */

} LoadState;

static l_noret error (LoadState *S, const char *why) {

luaO_pushfstring(S->L, "%s: bad binary format (%s)", S->name, why);

luaD_throw(S->L, LUA_ERRSYNTAX);

}

** All high-level loads go through loadVector; you can change it to

** adapt to the endianness of the input

#define loadVector(S,b,n) loadBlock(S,b,cast_sizet(n)*sizeof((b)[0]))

static void loadBlock (LoadState *S, void *b, size_t size) {

if (luaZ_read(S->Z, b, size) != 0)

error(S, "truncated chunk");

S->offset += size;

}

static void loadAlign (LoadState *S, unsigned align) {

unsigned padding = align - cast_uint(S->offset % align);

if (padding < align) { /* (padding == align) means no padding */

lua_Integer paddingContent;

loadBlock(S, &paddingContent, padding);

lua_assert(S->offset % align == 0);

}

#define getaddr(S,n,t) cast(t *, getaddr_(S,cast_sizet(n) * sizeof(t)))

static const void *getaddr_ (LoadState *S, size_t size) {

const void *block = luaZ_getaddr(S->Z, size);

S->offset += size;

if (block == NULL)

error(S, "truncated fixed buffer");

return block;

}

#define loadVar(S,x) loadVector(S,&x,1)

static lu_byte loadByte (LoadState *S) {

int b = zgetc(S->Z);

if (b == EOZ)

error(S, "truncated chunk");

S->offset++;

return cast_byte(b);

}

static lua_Unsigned loadVarint (LoadState *S, lua_Unsigned limit) {

lua_Unsigned x = 0;

int b;

limit >>= 7;

do {

b = loadByte(S);

if (x > limit)

error(S, "integer overflow");

x = (x << 7) | (b & 0x7f);

} while ((b & 0x80) != 0);

return x;

}

static size_t loadSize (LoadState *S) {

return cast_sizet(loadVarint(S, MAX_SIZE));

}

static int loadInt (LoadState *S) {

return cast_int(loadVarint(S, cast_sizet(INT_MAX)));

}

static lua_Number loadNumber (LoadState *S) {

lua_Number x;

loadVar(S, x);

return x;

}

static lua_Integer loadInteger (LoadState *S) {

lua_Unsigned cx = loadVarint(S, LUA_MAXUNSIGNED);

/* decode unsigned to signed */

if ((cx & 1) != 0)

return l_castU2S(~(cx >> 1));

else

return l_castU2S(cx >> 1);

}

** Load a nullable string into slot 'sl' from prototype 'p'. The

** assignment to the slot and the barrier must be performed before any

** possible GC activity, to anchor the string. (Both 'loadVector' and

** 'luaH_setint' can call the GC.)

static void loadString (LoadState *S, Proto *p, TString **sl) {

lua_State *L = S->L;

TString *ts;

TValue sv;

size_t size = loadSize(S);

if (size == 0) { /* previously saved string? */

lua_Unsigned idx = loadVarint(S, LUA_MAXUNSIGNED); /* get its index */

TValue stv;

if (idx == 0) { /* no string? */

lua_assert(*sl == NULL); /* must be prefilled */

return;

}

if (novariant(luaH_getint(S->h, l_castU2S(idx), &stv)) != LUA_TSTRING)

error(S, "invalid string index");

*sl = ts = tsvalue(&stv); /* get its value */

luaC_objbarrier(L, p, ts);

return; /* do not save it again */

}

else if ((size -= 1) <= LUAI_MAXSHORTLEN) { /* short string? */

char buff[LUAI_MAXSHORTLEN + 1]; /* extra space for '\0' */

loadVector(S, buff, size + 1); /* load string into buffer */

*sl = ts = luaS_newlstr(L, buff, size); /* create string */

luaC_objbarrier(L, p, ts);

}

else if (S->fixed) { /* for a fixed buffer, use a fixed string */

const char *s = getaddr(S, size + 1, char); /* get content address */

*sl = ts = luaS_newextlstr(L, s, size, NULL, NULL);

luaC_objbarrier(L, p, ts);

}

else { /* create internal copy */

*sl = ts = luaS_createlngstrobj(L, size); /* create string */

luaC_objbarrier(L, p, ts);

loadVector(S, getlngstr(ts), size + 1); /* load directly in final place */

}

/* add string to list of saved strings */

S->nstr++;

setsvalue(L, &sv, ts);

luaH_setint(L, S->h, l_castU2S(S->nstr), &sv);

luaC_objbarrierback(L, obj2gco(S->h), ts);

}

static void loadCode (LoadState *S, Proto *f) {

int n = loadInt(S);

loadAlign(S, sizeof(f->code[0]));

if (S->fixed) {

f->code = getaddr(S, n, Instruction);

f->sizecode = n;

}

else {

f->code = luaM_newvectorchecked(S->L, n, Instruction);

f->sizecode = n;

loadVector(S, f->code, n);

}

static void loadFunction(LoadState *S, Proto *f);

static void loadConstants (LoadState *S, Proto *f) {

int i;

int n = loadInt(S);

f->k = luaM_newvectorchecked(S->L, n, TValue);

f->sizek = n;

for (i = 0; i < n; i++)

setnilvalue(&f->k[i]);

for (i = 0; i < n; i++) {

TValue *o = &f->k[i];

int t = loadByte(S);

switch (t) {

case LUA_VNIL:

setnilvalue(o);

break;

case LUA_VFALSE:

setbfvalue(o);

break;

case LUA_VTRUE:

setbtvalue(o);

break;

case LUA_VNUMFLT:

setfltvalue(o, loadNumber(S));

break;

case LUA_VNUMINT:

setivalue(o, loadInteger(S));

break;

case LUA_VSHRSTR:

case LUA_VLNGSTR: {

lua_assert(f->source == NULL);

loadString(S, f, &f->source); /* use 'source' to anchor string */

if (f->source == NULL)

error(S, "bad format for constant string");

setsvalue2n(S->L, o, f->source); /* save it in the right place */

f->source = NULL;

break;

}

default: error(S, "invalid constant");

}

static void loadProtos (LoadState *S, Proto *f) {

int i;

int n = loadInt(S);

f->p = luaM_newvectorchecked(S->L, n, Proto *);

f->sizep = n;

for (i = 0; i < n; i++)

f->p[i] = NULL;

for (i = 0; i < n; i++) {

f->p[i] = luaF_newproto(S->L);

luaC_objbarrier(S->L, f, f->p[i]);

loadFunction(S, f->p[i]);

}

** Load the upvalues for a function. The names must be filled first,

** because the filling of the other fields can raise read errors and

** the creation of the error message can call an emergency collection;

** in that case all prototypes must be consistent for the GC.

static void loadUpvalues (LoadState *S, Proto *f) {

int i;

int n = loadInt(S);

f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc);

f->sizeupvalues = n;

for (i = 0; i < n; i++) /* make array valid for GC */

f->upvalues[i].name = NULL;

for (i = 0; i < n; i++) { /* following calls can raise errors */

f->upvalues[i].instack = loadByte(S);

f->upvalues[i].idx = loadByte(S);

f->upvalues[i].kind = loadByte(S);

}

static void loadDebug (LoadState *S, Proto *f) {

int i;

int n = loadInt(S);

if (S->fixed) {

f->lineinfo = getaddr(S, n, ls_byte);

f->sizelineinfo = n;

}

else {

f->lineinfo = luaM_newvectorchecked(S->L, n, ls_byte);

f->sizelineinfo = n;

loadVector(S, f->lineinfo, n);

}

n = loadInt(S);

if (n > 0) {

loadAlign(S, sizeof(int));

if (S->fixed) {

f->abslineinfo = getaddr(S, n, AbsLineInfo);

f->sizeabslineinfo = n;

}

else {

f->abslineinfo = luaM_newvectorchecked(S->L, n, AbsLineInfo);

f->sizeabslineinfo = n;

loadVector(S, f->abslineinfo, n);

}

n = loadInt(S);

f->locvars = luaM_newvectorchecked(S->L, n, LocVar);

f->sizelocvars = n;

for (i = 0; i < n; i++)

f->locvars[i].varname = NULL;

for (i = 0; i < n; i++) {

loadString(S, f, &f->locvars[i].varname);

f->locvars[i].startpc = loadInt(S);

f->locvars[i].endpc = loadInt(S);

}

n = loadInt(S);

if (n != 0) /* does it have debug information? */

n = f->sizeupvalues; /* must be this many */

for (i = 0; i < n; i++)

loadString(S, f, &f->upvalues[i].name);

}

static void loadFunction (LoadState *S, Proto *f) {

f->linedefined = loadInt(S);

f->lastlinedefined = loadInt(S);

f->numparams = loadByte(S);

/* get only the meaningful flags */

f->flag = cast_byte(loadByte(S) & ~PF_FIXED);

if (S->fixed)

f->flag |= PF_FIXED; /* signal that code is fixed */

f->maxstacksize = loadByte(S);

loadCode(S, f);

loadConstants(S, f);

loadUpvalues(S, f);

loadProtos(S, f);

loadString(S, f, &f->source);

loadDebug(S, f);

}

static void checkliteral (LoadState *S, const char *s, const char *msg) {

char buff[sizeof(LUA_SIGNATURE) + sizeof(LUAC_DATA)]; /* larger than both */

size_t len = strlen(s);

loadVector(S, buff, len);

if (memcmp(s, buff, len) != 0)

error(S, msg);

}

static l_noret numerror (LoadState *S, const char *what, const char *tname) {

const char *msg = luaO_pushfstring(S->L, "%s %s mismatch", tname, what);

error(S, msg);

}

static void checknumsize (LoadState *S, int size, const char *tname) {

if (size != loadByte(S))

numerror(S, "size", tname);

}

static void checknumformat (LoadState *S, int eq, const char *tname) {

if (!eq)

numerror(S, "format", tname);

}

#define checknum(S,tvar,value,tname) \

{ tvar i; checknumsize(S, sizeof(i), tname); \

loadVar(S, i); \

checknumformat(S, i == value, tname); }

static void checkHeader (LoadState *S) {

/* skip 1st char (already read and checked) */

checkliteral(S, &LUA_SIGNATURE[1], "not a binary chunk");

if (loadByte(S) != LUAC_VERSION)

error(S, "version mismatch");

if (loadByte(S) != LUAC_FORMAT)

error(S, "format mismatch");

checkliteral(S, LUAC_DATA, "corrupted chunk");

checknum(S, int, LUAC_INT, "int");

checknum(S, Instruction, LUAC_INST, "instruction");

checknum(S, lua_Integer, LUAC_INT, "Lua integer");

checknum(S, lua_Number, LUAC_NUM, "Lua number");

}

** Load precompiled chunk.

LClosure *luaU_undump (lua_State *L, ZIO *Z, const char *name, int fixed) {

LoadState S;

LClosure *cl;

if (*name == '@' || *name == '=')

name = name + 1;

else if (*name == LUA_SIGNATURE[0])

name = "binary string";

S.name = name;

S.L = L;

S.Z = Z;

S.fixed = cast_byte(fixed);

S.offset = 1; /* fist byte was already read */

checkHeader(&S);

cl = luaF_newLclosure(L, loadByte(&S));

setclLvalue2s(L, L->top.p, cl);

luaD_inctop(L);

S.h = luaH_new(L); /* create list of saved strings */

S.nstr = 0;

sethvalue2s(L, L->top.p, S.h); /* anchor it */

luaD_inctop(L);

cl->p = luaF_newproto(L);

luaC_objbarrier(L, cl, cl->p);

loadFunction(&S, cl->p);

if (cl->nupvalues != cl->p->sizeupvalues)

error(&S, "corrupted chunk");

luai_verifycode(L, cl->p);

L->top.p--; /* pop table */

return cl;

}

lua55c/src/lundump.c at main · 2MoonsLua/lua55c · GitHub

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