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nodemcu-firmware/components/lua/lua-5.3/ldump.c

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/*
** $Id: ldump.c,v 2.37.1.1 2017/04/19 17:20:42 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 "lapi.h"
#include "lauxlib.h"
#include "llex.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "lundump.h"
typedef struct {
lua_State *L;
lua_Writer writer;
void *data;
int strip;
int status;
#ifdef LUA_USE_HOST
int useStrRefs;
Table *stringIndex;
int sTScnt;
int lTScnt;
int nFixed;
#endif
} DumpState;
/*
** To ensure that dump files are loadable onto the ESP architectures:
** 1. Integers are in the range -2^31 .. 2^31-1 (sint32_t)
** 2. Floats are the IEEE 4 or 8 byte format, with a 4 byte default.
**
** The file formats are also different to standard because of two add
** additional goals:
** 3. The file must be serially loadable into a programmable flash
** memory through a file-write like API call.
** 4. Compactness of dump files is a key design goal.
*/
#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 (lu_byte x, DumpState *D) {
DumpVar(x, D);
}
/*
** Dump (unsigned) int 0..MAXINT using multibyte encoding (MBE). DumpInt
** is used for context dependent counts and sizes; no type information
** is embedded.
*/
static void DumpInt (lua_Integer x, DumpState *D) {
lu_byte buf[sizeof(lua_Integer) + 2];
lu_byte *b = buf + sizeof(buf) - 1;
lua_assert(x>=0);
*b-- = x & 0x7f; x >>= 7;
while(x) { *b-- = 0x80 + (x & 0x7f); x >>= 7; }
b++;
lua_assert (b >= buf);
DumpVector(b, (buf - b) + sizeof(buf), D);
}
static void DumpNumber (lua_Number x, DumpState *D) {
DumpByte(LUAU_TNUMFLT, D);
DumpVar(x, D);
}
/*
** DumpIntTT is MBE and embeds a type encoding for string length and integers.
** It also handles negative integers by forcing the type to LUAU_TNUMNINT.
** 0TTTNNNN or 1TTTNNNN (1NNNNNNN)* 0NNNNNNN
*/
static void DumpIntTT (lu_byte tt, lua_Integer y, DumpState *D) {
lua_Integer x = y < 0 ? -(y + 1) : y;
lu_byte buf[sizeof(lua_Integer) + 3];
lu_byte *b = buf + sizeof(buf) - 1;
*b-- = x & 0x7f; x >>= 7;
while(x) { *b-- = 0x80 + (x & 0x7f); x >>= 7; }
b++;
if (*b & cast(lu_byte, LUAU_TMASK) )/* Need an extra byte for the type bits? */
*--b = 0x80;
*b |= (y >= 0) ? tt: LUAU_TNUMNINT;
lua_assert (b >= buf);
DumpVector(b, (buf - b) + sizeof(buf), D);
}
#define DumpInteger(i, D) DumpIntTT(LUAU_TNUMPINT, i, D);
/*
** Strings are stored in LFS uniquely, any string references use this index.
** The table at D->stringIndex is used to lookup this unique index.
*/
static void DumpString (const TString *s, DumpState *D) {
if (s == NULL) {
DumpByte(LUAU_TSSTRING + 0, D);
} else {
lu_byte tt = (gettt(s) == LUA_TSHRSTR) ? LUAU_TSSTRING : LUAU_TLSTRING;
size_t l = tsslen(s);
const char *str = getstr(s);
#ifdef LUA_USE_HOST
if (D->useStrRefs) {
const TValue *o = luaH_getstr(D->stringIndex, cast(TString *,s));
DumpIntTT(tt, ivalue(o), D);
return;
}
#endif
DumpIntTT(tt, l + 1, D); /* include trailing '\0' */
DumpVector(str, l, 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];
switch (ttype(o)) {
case LUA_TNIL:
DumpByte(LUAU_TNIL, D);
break;
case LUA_TBOOLEAN:
DumpByte(LUAU_TBOOLEAN + 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, nostrip = (D->strip == 0);
DumpByte(nostrip, D);
DumpInt(n, D);
for (i = 0; i < n; i++) {
if (nostrip)
DumpString(f->upvalues[i].name, D);
DumpByte(f->upvalues[i].instack, D);
DumpByte(f->upvalues[i].idx, D);
}
}
static void DumpDebug (const Proto *f, DumpState *D) {
int i, keepli = (D->strip <= 1), keeplv = (D->strip == 0);
int n = keepli ? f->sizelineinfo : 0;
DumpInt(n, D);
DumpVector(f->lineinfo, n, D);
n = keeplv ? f->sizelocvars : 0;
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);
}
}
static void DumpFunction (const Proto *f, TString *psource, DumpState *D) {
if (f->source == psource)
DumpString(NULL, D); /* same source as its parent */
else
DumpString(f->source, D);
DumpInt(f->linedefined, D);
DumpInt(f->lastlinedefined, D);
DumpByte(getnumparams(f), D);
DumpByte(getis_vararg(f), D);
DumpByte(getmaxstacksize(f), D);
DumpProtos(f, D);
DumpCode(f, D);
DumpConstants(f, D);
DumpUpvalues(f, D);
DumpDebug(f, D);
}
static void DumpHeader (DumpState *D, int format) {
DumpLiteral(LUA_SIGNATURE, D);
DumpByte(LUAC_VERSION, D);
DumpByte(format, D);
DumpLiteral(LUAC_DATA, D);
DumpByte(sizeof(int), D);
DumpByte(sizeof(Instruction), D);
DumpByte(sizeof(lua_Integer), D);
DumpByte(sizeof(lua_Number), D);
/* Note that we multi-byte encoded integers so need to check size_t or endian */
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 = {0};
D.L = L;
D.writer = w;
D.data = data;
D.strip = strip;
DumpHeader(&D, LUAC_FORMAT);
DumpByte(f->sizeupvalues, &D);
DumpFunction(f, NULL, &D);
return D.status;
}
static int stripdebug (lua_State *L, Proto *f, int level) {
int i, len = 0;
switch (level) {
case 2:
if (f->lineinfo) {
f->lineinfo = luaM_freearray(L, f->lineinfo, f->sizelineinfo);
len += f->sizelineinfo;
}
// fall-through
case 1:
for (i=0; i<f->sizeupvalues; i++)
f->upvalues[i].name = NULL;
f->locvars = luaM_freearray(L, f->locvars, f->sizelocvars);
len += f->sizelocvars * sizeof(LocVar);
f->sizelocvars = 0;
}
return len;
}
/* This is a recursive function so it's stack size has been kept to a minimum! */
int luaU_stripdebug (lua_State *L, Proto *f, int level, int recv){
int len = 0, i;
if (recv != 0 && f->sizep != 0) {
for(i=0;i<f->sizep;i++) len += luaU_stripdebug(L, f->p[i], level, recv);
}
len += stripdebug (L, f, level);
return len;
}
/*============================================================================**
**
** NodeMCU extensions for LFS support and dumping. Note that to keep lua_lock
** pairing for testing, this dump/unload functionality works within a locked
** window and therefore has to use the core luaH, ..., APIs rather than the
** public Lua and lauxlib APIs.
**
**============================================================================*/
#ifdef LUA_USE_HOST
/*
** Add a TS found in the Proto Load to the table at the ToS. Note that this is
** a unified table of {string = index} for both short and long TStrings.
*/
static void addTS (TString *ts, DumpState *D) {
lua_State *L = D->L;
if (!ts)
return;
if (ttisnil(luaH_getstr(D->stringIndex, ts))) {
TValue k, v, *slot;
gettt(ts)<=LUA_TSHRSTR ? D->sTScnt++ : D->lTScnt++;
setsvalue(L, &k, ts);
setivalue(&v, D->sTScnt + D->lTScnt);
slot = luaH_set(L, D->stringIndex, &k);
setobj2t(L, slot, &v);
luaC_barrierback(L, D->stringIndex, &v);
}
}
/*
** Add the fixed TS that are created by the luaX and LuaT initialisation
** and fixed so not collectable. This are always loaded into LFS to save
** RAM and can be implicitly referenced in any Proto.
*/
static void addFixedStrings (DumpState *D) {
int i;
const char *p;
for (i = 0; (p = luaX_getstr(i, 0))!=NULL; i++)
addTS(luaS_new(D->L, p), D);
addTS(G(D->L)->memerrmsg, D);
addTS(luaS_new(D->L, LUA_ENV), D);
for (i = 0; (p = luaT_getstr(i))!=NULL; i++)
addTS(luaS_new(D->L, p), D);
lua_assert(D->lTScnt == 0); /* all of these fixed strings should be short */
D->nFixed = D->sTScnt; /* book mark for later skipping */
}
/*
** Dump all LFS strings. If there are 71 fixed and 17 LFS strings, say, in
** the stringIndex, then these fixed and LFS strings are numbered 1..71 and
** 72..88 respectively; this numbering is swapped to 18..88 and 1..17. The
** fixed strings are fixed and can be omitted from the LFS image.
*/
static void DumpLFSstrings(DumpState *D) {
lua_State *L = D->L;
int n = D->sTScnt + D->lTScnt;
int i, maxlen = 0, nStrings = n - D->nFixed;
Table *revT = luaH_new(L);
sethvalue(L, L->top++, revT); /* Put on stack to prevent GC */
luaH_resize(L, revT, n, 0);
luaC_checkGC(L);
/* luaH_next scan of stringIndex table using two top of stack entries */
setnilvalue(L->top++);
api_incr_top(L);
while (luaH_next(L, D->stringIndex, L->top-2)) {
/*
* Update the value to swap fix and LFS order, then insert (v, k) into
* the reverse index table. Note that luaC_barrier checks not required
* for overwrites and non-collectable values.
*/
int len = tsslen(tsvalue(L->top-2));
lua_Integer *i = &L->top[-1].value_.i;
*i += *i > D->nFixed ? -D->nFixed : nStrings; /* recalc index and */
luaH_set(L, D->stringIndex, L->top-2)->value_.i = *i; /* update table value */
luaH_setint(L, revT, ivalue(L->top-1), L->top-2); /* Add str to reverse T */
if (len > maxlen) maxlen = len; /* roll up maximum string size */
}
L->top -= 2; /* discard key and value stack slots */
DumpInt(maxlen, D);
DumpInt(D->sTScnt, D);
DumpInt(D->lTScnt, D);
DumpInt(nStrings, D);
for (i = 1; i <= nStrings; i++) { /* dump out non-fixed strings in order */
const TValue *o = luaH_getint(revT, i);
DumpString(tsvalue(o), D);
}
L->top--; /* pop revT stack entry */
luaC_checkGC(L);
}
/*
** Recursive scan all of the Protos in the Proto hierarchy
** to collect all referenced strings in 2 Lua Arrays at ToS.
*/
#define OVER(n) for (i = 0; i < (n); i++)
static void scanProtoStrings(const Proto *f, DumpState *D) {
int i;
addTS(f->source, D);
OVER(f->sizek) if (ttisstring(f->k + i))
addTS(tsvalue(f->k + i), D);
OVER(f->sizeupvalues) addTS(f->upvalues[i].name, D);
OVER(f->sizelocvars) addTS(f->locvars[i].varname, D);
OVER(f->sizep) scanProtoStrings(f->p[i], D);
}
/*
** An LFS image comprises a prologue segment of all of the strings used in
** the image, followed by a set of Proto dumps. Each of these is essentially
** the same as standard lua_dump format, except that string constants don't
** contain the string inline, but are instead an index into the prologue.
** Separating out the strings in this way simplifies loading the image
** content into an LFS region.
**
** A dummy container Proto, main, is used to hold all of the Protos to go
** into the image. The Proto main itself is not callable; it is used as the
** image Proto index and only contains a Proto vector and a constant vector
** where each constant in the string names the corresponding Proto.
*/
int luaU_DumpAllProtos(lua_State *L, const Proto *m, lua_Writer w,
void *data, int strip) {
DumpState D = {0};
D.L = L;
D.writer = w;
D.data = data;
D.strip = strip;
lua_assert(L->stack_last - L->top > 5); /* This dump uses 5 stack slots */
DumpHeader(&D, LUAC_LFS_IMAGE_FORMAT);
DumpInteger(G(L)->seed, &D);
D.stringIndex = luaH_new(L);
sethvalue(L, L->top++, D.stringIndex); /* Put on stack to prevent GC */
/* Add fixed strings + strings used in the Protos, then swap fixed/added blocks */
addFixedStrings(&D);
scanProtoStrings(m, &D);
/* Dump out all non-fixed strings */
DumpLiteral(LUA_STRING_SIG, &D);
DumpLFSstrings(&D);
/* Switch to string reference mode and add the Protos themselves */
D.useStrRefs = 1;
DumpLiteral(LUA_PROTO_SIG, &D);
DumpProtos(m, &D);
DumpConstants(m, &D); /* Dump Function name vector */
L->top--;
return D.status;
}
#endif
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