[redis.git] / deps / lua / src / lundump.c

/*
** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
** load precompiled Lua chunks
** See Copyright Notice in lua.h
*/

#include <string.h>

#define lundump_c
#define LUA_CORE

#include "lua.h"

#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstring.h"
#include "lundump.h"
#include "lzio.h"

typedef struct {
 lua_State* L;
 ZIO* Z;
 Mbuffer* b;
 const char* name;
} LoadState;

#ifdef LUAC_TRUST_BINARIES
#define IF(c,s)
#define error(S,s)
#else
#define IF(c,s)		if (c) error(S,s)

static void error(LoadState* S, const char* why)
{
 luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
 luaD_throw(S->L,LUA_ERRSYNTAX);
}
#endif

#define LoadMem(S,b,n,size)	LoadBlock(S,b,(n)*(size))
#define	LoadByte(S)		(lu_byte)LoadChar(S)
#define LoadVar(S,x)		LoadMem(S,&x,1,sizeof(x))
#define LoadVector(S,b,n,size)	LoadMem(S,b,n,size)

static void LoadBlock(LoadState* S, void* b, size_t size)
{
 size_t r=luaZ_read(S->Z,b,size);
 IF (r!=0, "unexpected end");
}

static int LoadChar(LoadState* S)
{
 char x;
 LoadVar(S,x);
 return x;
}

static int LoadInt(LoadState* S)
{
 int x;
 LoadVar(S,x);
 IF (x<0, "bad integer");
 return x;
}

static lua_Number LoadNumber(LoadState* S)
{
 lua_Number x;
 LoadVar(S,x);
 return x;
}

static TString* LoadString(LoadState* S)
{
 size_t size;
 LoadVar(S,size);
 if (size==0)
  return NULL;
 else
 {
  char* s=luaZ_openspace(S->L,S->b,size);
  LoadBlock(S,s,size);
  return luaS_newlstr(S->L,s,size-1);		/* remove trailing '\0' */
 }
}

static void LoadCode(LoadState* S, Proto* f)
{
 int n=LoadInt(S);
 f->code=luaM_newvector(S->L,n,Instruction);
 f->sizecode=n;
 LoadVector(S,f->code,n,sizeof(Instruction));
}

static Proto* LoadFunction(LoadState* S, TString* p);

static void LoadConstants(LoadState* S, Proto* f)
{
 int i,n;
 n=LoadInt(S);
 f->k=luaM_newvector(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=LoadChar(S);
  switch (t)
  {
   case LUA_TNIL:
   	setnilvalue(o);
	break;
   case LUA_TBOOLEAN:
   	setbvalue(o,LoadChar(S)!=0);
	break;
   case LUA_TNUMBER:
	setnvalue(o,LoadNumber(S));
	break;
   case LUA_TSTRING:
	setsvalue2n(S->L,o,LoadString(S));
	break;
   default:
	error(S,"bad constant");
	break;
  }
 }
 n=LoadInt(S);
 f->p=luaM_newvector(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]=LoadFunction(S,f->source);
}

static void LoadDebug(LoadState* S, Proto* f)
{
 int i,n;
 n=LoadInt(S);
 f->lineinfo=luaM_newvector(S->L,n,int);
 f->sizelineinfo=n;
 LoadVector(S,f->lineinfo,n,sizeof(int));
 n=LoadInt(S);
 f->locvars=luaM_newvector(S->L,n,LocVar);
 f->sizelocvars=n;
 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
 for (i=0; i<n; i++)
 {
  f->locvars[i].varname=LoadString(S);
  f->locvars[i].startpc=LoadInt(S);
  f->locvars[i].endpc=LoadInt(S);
 }
 n=LoadInt(S);
 f->upvalues=luaM_newvector(S->L,n,TString*);
 f->sizeupvalues=n;
 for (i=0; i<n; i++) f->upvalues[i]=NULL;
 for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
}

static Proto* LoadFunction(LoadState* S, TString* p)
{
 Proto* f;
 if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
 f=luaF_newproto(S->L);
 setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
 f->source=LoadString(S); if (f->source==NULL) f->source=p;
 f->linedefined=LoadInt(S);
 f->lastlinedefined=LoadInt(S);
 f->nups=LoadByte(S);
 f->numparams=LoadByte(S);
 f->is_vararg=LoadByte(S);
 f->maxstacksize=LoadByte(S);
 LoadCode(S,f);
 LoadConstants(S,f);
 LoadDebug(S,f);
 IF (!luaG_checkcode(f), "bad code");
 S->L->top--;
 S->L->nCcalls--;
 return f;
}

static void LoadHeader(LoadState* S)
{
 char h[LUAC_HEADERSIZE];
 char s[LUAC_HEADERSIZE];
 luaU_header(h);
 LoadBlock(S,s,LUAC_HEADERSIZE);
 IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
}

/*
** load precompiled chunk
*/
Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
{
 LoadState S;
 if (*name=='@' || *name=='=')
  S.name=name+1;
 else if (*name==LUA_SIGNATURE[0])
  S.name="binary string";
 else
  S.name=name;
 S.L=L;
 S.Z=Z;
 S.b=buff;
 LoadHeader(&S);
 return LoadFunction(&S,luaS_newliteral(L,"=?"));
}

/*
* make header
*/
void luaU_header (char* h)
{
 int x=1;
 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
 h+=sizeof(LUA_SIGNATURE)-1;
 *h++=(char)LUAC_VERSION;
 *h++=(char)LUAC_FORMAT;
 *h++=(char)*(char*)&x;				/* endianness */
 *h++=(char)sizeof(int);
 *h++=(char)sizeof(size_t);
 *h++=(char)sizeof(Instruction);
 *h++=(char)sizeof(lua_Number);
 *h++=(char)(((lua_Number)0.5)==0);		/* is lua_Number integral? */
}
Commit	Line	Data
21d3294c	1	/*
	2	** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
	3	** load precompiled Lua chunks
	4	** See Copyright Notice in lua.h
	5	*/
	6
	7	#include <string.h>
	8
	9	#define lundump_c
	10	#define LUA_CORE
	11
	12	#include "lua.h"
	13
	14	#include "ldebug.h"
	15	#include "ldo.h"
	16	#include "lfunc.h"
	17	#include "lmem.h"
	18	#include "lobject.h"
	19	#include "lstring.h"
	20	#include "lundump.h"
	21	#include "lzio.h"
	22
	23	typedef struct {
	24	lua_State* L;
	25	ZIO* Z;
	26	Mbuffer* b;
	27	const char* name;
	28	} LoadState;
	29
	30	#ifdef LUAC_TRUST_BINARIES
	31	#define IF(c,s)
	32	#define error(S,s)
	33	#else
	34	#define IF(c,s) if (c) error(S,s)
	35
	36	static void error(LoadState* S, const char* why)
	37	{
	38	luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
	39	luaD_throw(S->L,LUA_ERRSYNTAX);
	40	}
	41	#endif
	42
	43	#define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
	44	#define LoadByte(S) (lu_byte)LoadChar(S)
	45	#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
	46	#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
	47
	48	static void LoadBlock(LoadState* S, void* b, size_t size)
	49	{
	50	size_t r=luaZ_read(S->Z,b,size);
	51	IF (r!=0, "unexpected end");
	52	}
	53
	54	static int LoadChar(LoadState* S)
	55	{
	56	char x;
	57	LoadVar(S,x);
	58	return x;
	59	}
	60
	61	static int LoadInt(LoadState* S)
	62	{
	63	int x;
	64	LoadVar(S,x);
65	IF (x<0, "bad integer");
66	return x;
67	}
68
69	static lua_Number LoadNumber(LoadState* S)
70	{
71	lua_Number x;
72	LoadVar(S,x);
73	return x;
74	}
75
76	static TString* LoadString(LoadState* S)
77	{
78	size_t size;
79	LoadVar(S,size);
80	if (size==0)
81	return NULL;
82	else
83	{
84	char* s=luaZ_openspace(S->L,S->b,size);
85	LoadBlock(S,s,size);
86	return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
87	}
88	}
89
90	static void LoadCode(LoadState* S, Proto* f)
91	{
92	int n=LoadInt(S);
93	f->code=luaM_newvector(S->L,n,Instruction);
94	f->sizecode=n;
95	LoadVector(S,f->code,n,sizeof(Instruction));
96	}
97
98	static Proto* LoadFunction(LoadState* S, TString* p);
99
100	static void LoadConstants(LoadState* S, Proto* f)
101	{
102	int i,n;
103	n=LoadInt(S);
104	f->k=luaM_newvector(S->L,n,TValue);
105	f->sizek=n;
106	for (i=0; i<n; i++) setnilvalue(&f->k[i]);
107	for (i=0; i<n; i++)
108	{
109	TValue* o=&f->k[i];
110	int t=LoadChar(S);
111	switch (t)
112	{
113	case LUA_TNIL:
114	setnilvalue(o);
115	break;
116	case LUA_TBOOLEAN:
117	setbvalue(o,LoadChar(S)!=0);
118	break;
119	case LUA_TNUMBER:
120	setnvalue(o,LoadNumber(S));
121	break;
122	case LUA_TSTRING:
123	setsvalue2n(S->L,o,LoadString(S));
124	break;
125	default:
126	error(S,"bad constant");
127	break;
128	}
129	}
130	n=LoadInt(S);
131	f->p=luaM_newvector(S->L,n,Proto*);
132	f->sizep=n;
133	for (i=0; i<n; i++) f->p[i]=NULL;
134	for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
135	}
136
137	static void LoadDebug(LoadState* S, Proto* f)
138	{
139	int i,n;
140	n=LoadInt(S);
141	f->lineinfo=luaM_newvector(S->L,n,int);
142	f->sizelineinfo=n;
143	LoadVector(S,f->lineinfo,n,sizeof(int));
144	n=LoadInt(S);
145	f->locvars=luaM_newvector(S->L,n,LocVar);
146	f->sizelocvars=n;
147	for (i=0; i<n; i++) f->locvars[i].varname=NULL;
148	for (i=0; i<n; i++)
149	{
150	f->locvars[i].varname=LoadString(S);
151	f->locvars[i].startpc=LoadInt(S);
152	f->locvars[i].endpc=LoadInt(S);
153	}
154	n=LoadInt(S);
155	f->upvalues=luaM_newvector(S->L,n,TString*);
156	f->sizeupvalues=n;
157	for (i=0; i<n; i++) f->upvalues[i]=NULL;
158	for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
159	}
160
161	static Proto* LoadFunction(LoadState* S, TString* p)
162	{
163	Proto* f;
164	if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
165	f=luaF_newproto(S->L);
166	setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
167	f->source=LoadString(S); if (f->source==NULL) f->source=p;
168	f->linedefined=LoadInt(S);
169	f->lastlinedefined=LoadInt(S);
170	f->nups=LoadByte(S);
171	f->numparams=LoadByte(S);
172	f->is_vararg=LoadByte(S);
173	f->maxstacksize=LoadByte(S);
174	LoadCode(S,f);
175	LoadConstants(S,f);
176	LoadDebug(S,f);
177	IF (!luaG_checkcode(f), "bad code");
178	S->L->top--;
179	S->L->nCcalls--;
180	return f;
181	}
182
183	static void LoadHeader(LoadState* S)
184	{
185	char h[LUAC_HEADERSIZE];
186	char s[LUAC_HEADERSIZE];
187	luaU_header(h);
188	LoadBlock(S,s,LUAC_HEADERSIZE);
189	IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
190	}
191
192	/*
193	** load precompiled chunk
194	*/
195	Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
196	{
197	LoadState S;
198	if (name=='@' \|\| name=='=')
199	S.name=name+1;
200	else if (*name==LUA_SIGNATURE[0])
201	S.name="binary string";
202	else
203	S.name=name;
204	S.L=L;
205	S.Z=Z;
206	S.b=buff;
207	LoadHeader(&S);
208	return LoadFunction(&S,luaS_newliteral(L,"=?"));
209	}
210
211	/*
212	* make header
213	*/
214	void luaU_header (char* h)
215	{
216	int x=1;
217	memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
218	h+=sizeof(LUA_SIGNATURE)-1;
219	*h++=(char)LUAC_VERSION;
220	*h++=(char)LUAC_FORMAT;
221	h++=(char)(char)&x; / endianness */
222	*h++=(char)sizeof(int);
223	*h++=(char)sizeof(size_t);
224	*h++=(char)sizeof(Instruction);
225	*h++=(char)sizeof(lua_Number);
226	h++=(char)(((lua_Number)0.5)==0); / is lua_Number integral? */
227	}