ba8b5c17 |
1 | /* |
2 | ** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 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 | static l_noret error(LoadState* S, const char* why) |
31 | { |
32 | luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why); |
33 | luaD_throw(S->L,LUA_ERRSYNTAX); |
34 | } |
35 | |
36 | #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size)) |
37 | #define LoadByte(S) (lu_byte)LoadChar(S) |
38 | #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x)) |
39 | #define LoadVector(S,b,n,size) LoadMem(S,b,n,size) |
40 | |
41 | #if !defined(luai_verifycode) |
42 | #define luai_verifycode(L,b,f) /* empty */ |
43 | #endif |
44 | |
45 | static void LoadBlock(LoadState* S, void* b, size_t size) |
46 | { |
47 | if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated"); |
48 | } |
49 | |
50 | static int LoadChar(LoadState* S) |
51 | { |
52 | char x; |
53 | LoadVar(S,x); |
54 | return x; |
55 | } |
56 | |
57 | static int LoadInt(LoadState* S) |
58 | { |
59 | int x; |
60 | LoadVar(S,x); |
61 | if (x<0) error(S,"corrupted"); |
62 | return x; |
63 | } |
64 | |
65 | static lua_Number LoadNumber(LoadState* S) |
66 | { |
67 | lua_Number x; |
68 | LoadVar(S,x); |
69 | return x; |
70 | } |
71 | |
72 | static TString* LoadString(LoadState* S) |
73 | { |
74 | size_t size; |
75 | LoadVar(S,size); |
76 | if (size==0) |
77 | return NULL; |
78 | else |
79 | { |
80 | char* s=luaZ_openspace(S->L,S->b,size); |
81 | LoadBlock(S,s,size*sizeof(char)); |
82 | return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */ |
83 | } |
84 | } |
85 | |
86 | static void LoadCode(LoadState* S, Proto* f) |
87 | { |
88 | int n=LoadInt(S); |
89 | f->code=luaM_newvector(S->L,n,Instruction); |
90 | f->sizecode=n; |
91 | LoadVector(S,f->code,n,sizeof(Instruction)); |
92 | } |
93 | |
94 | static void LoadFunction(LoadState* S, Proto* f); |
95 | |
96 | static void LoadConstants(LoadState* S, Proto* f) |
97 | { |
98 | int i,n; |
99 | n=LoadInt(S); |
100 | f->k=luaM_newvector(S->L,n,TValue); |
101 | f->sizek=n; |
102 | for (i=0; i<n; i++) setnilvalue(&f->k[i]); |
103 | for (i=0; i<n; i++) |
104 | { |
105 | TValue* o=&f->k[i]; |
106 | int t=LoadChar(S); |
107 | switch (t) |
108 | { |
109 | case LUA_TNIL: |
110 | setnilvalue(o); |
111 | break; |
112 | case LUA_TBOOLEAN: |
113 | setbvalue(o,LoadChar(S)); |
114 | break; |
115 | case LUA_TNUMBER: |
116 | setnvalue(o,LoadNumber(S)); |
117 | break; |
118 | case LUA_TSTRING: |
119 | setsvalue2n(S->L,o,LoadString(S)); |
120 | break; |
121 | default: lua_assert(0); |
122 | } |
123 | } |
124 | n=LoadInt(S); |
125 | f->p=luaM_newvector(S->L,n,Proto*); |
126 | f->sizep=n; |
127 | for (i=0; i<n; i++) f->p[i]=NULL; |
128 | for (i=0; i<n; i++) |
129 | { |
130 | f->p[i]=luaF_newproto(S->L); |
131 | LoadFunction(S,f->p[i]); |
132 | } |
133 | } |
134 | |
135 | static void LoadUpvalues(LoadState* S, Proto* f) |
136 | { |
137 | int i,n; |
138 | n=LoadInt(S); |
139 | f->upvalues=luaM_newvector(S->L,n,Upvaldesc); |
140 | f->sizeupvalues=n; |
141 | for (i=0; i<n; i++) f->upvalues[i].name=NULL; |
142 | for (i=0; i<n; i++) |
143 | { |
144 | f->upvalues[i].instack=LoadByte(S); |
145 | f->upvalues[i].idx=LoadByte(S); |
146 | } |
147 | } |
148 | |
149 | static void LoadDebug(LoadState* S, Proto* f) |
150 | { |
151 | int i,n; |
152 | f->source=LoadString(S); |
153 | n=LoadInt(S); |
154 | f->lineinfo=luaM_newvector(S->L,n,int); |
155 | f->sizelineinfo=n; |
156 | LoadVector(S,f->lineinfo,n,sizeof(int)); |
157 | n=LoadInt(S); |
158 | f->locvars=luaM_newvector(S->L,n,LocVar); |
159 | f->sizelocvars=n; |
160 | for (i=0; i<n; i++) f->locvars[i].varname=NULL; |
161 | for (i=0; i<n; i++) |
162 | { |
163 | f->locvars[i].varname=LoadString(S); |
164 | f->locvars[i].startpc=LoadInt(S); |
165 | f->locvars[i].endpc=LoadInt(S); |
166 | } |
167 | n=LoadInt(S); |
168 | for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S); |
169 | } |
170 | |
171 | static void LoadFunction(LoadState* S, Proto* f) |
172 | { |
173 | f->linedefined=LoadInt(S); |
174 | f->lastlinedefined=LoadInt(S); |
175 | f->numparams=LoadByte(S); |
176 | f->is_vararg=LoadByte(S); |
177 | f->maxstacksize=LoadByte(S); |
178 | LoadCode(S,f); |
179 | LoadConstants(S,f); |
180 | LoadUpvalues(S,f); |
181 | LoadDebug(S,f); |
182 | } |
183 | |
184 | /* the code below must be consistent with the code in luaU_header */ |
185 | #define N0 LUAC_HEADERSIZE |
186 | #define N1 (sizeof(LUA_SIGNATURE)-sizeof(char)) |
187 | #define N2 N1+2 |
188 | #define N3 N2+6 |
189 | |
190 | static void LoadHeader(LoadState* S) |
191 | { |
192 | lu_byte h[LUAC_HEADERSIZE]; |
193 | lu_byte s[LUAC_HEADERSIZE]; |
194 | luaU_header(h); |
195 | memcpy(s,h,sizeof(char)); /* first char already read */ |
196 | LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char)); |
197 | if (memcmp(h,s,N0)==0) return; |
198 | if (memcmp(h,s,N1)!=0) error(S,"not a"); |
199 | if (memcmp(h,s,N2)!=0) error(S,"version mismatch in"); |
200 | if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted"); |
201 | } |
202 | |
203 | /* |
204 | ** load precompiled chunk |
205 | */ |
206 | Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name) |
207 | { |
208 | LoadState S; |
209 | Closure* cl; |
210 | if (*name=='@' || *name=='=') |
211 | S.name=name+1; |
212 | else if (*name==LUA_SIGNATURE[0]) |
213 | S.name="binary string"; |
214 | else |
215 | S.name=name; |
216 | S.L=L; |
217 | S.Z=Z; |
218 | S.b=buff; |
219 | LoadHeader(&S); |
220 | cl=luaF_newLclosure(L,1); |
221 | setclLvalue(L,L->top,cl); incr_top(L); |
222 | cl->l.p=luaF_newproto(L); |
223 | LoadFunction(&S,cl->l.p); |
224 | if (cl->l.p->sizeupvalues != 1) |
225 | { |
226 | Proto* p=cl->l.p; |
227 | cl=luaF_newLclosure(L,cl->l.p->sizeupvalues); |
228 | cl->l.p=p; |
229 | setclLvalue(L,L->top-1,cl); |
230 | } |
231 | luai_verifycode(L,buff,cl->l.p); |
232 | return cl; |
233 | } |
234 | |
235 | #define MYINT(s) (s[0]-'0') |
236 | #define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR) |
237 | #define FORMAT 0 /* this is the official format */ |
238 | |
239 | /* |
240 | * make header for precompiled chunks |
241 | * if you change the code below be sure to update LoadHeader and FORMAT above |
242 | * and LUAC_HEADERSIZE in lundump.h |
243 | */ |
244 | void luaU_header (lu_byte* h) |
245 | { |
246 | int x=1; |
247 | memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char)); |
248 | h+=sizeof(LUA_SIGNATURE)-sizeof(char); |
249 | *h++=cast_byte(VERSION); |
250 | *h++=cast_byte(FORMAT); |
251 | *h++=cast_byte(*(char*)&x); /* endianness */ |
252 | *h++=cast_byte(sizeof(int)); |
253 | *h++=cast_byte(sizeof(size_t)); |
254 | *h++=cast_byte(sizeof(Instruction)); |
255 | *h++=cast_byte(sizeof(lua_Number)); |
256 | *h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */ |
257 | memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char)); |
258 | } |