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[redis.git] / deps / lua / src / ldump.c
1 /*
2 ** $Id: ldump.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
3 ** save precompiled Lua chunks
4 ** See Copyright Notice in lua.h
5 */
6
7 #include <stddef.h>
8
9 #define ldump_c
10 #define LUA_CORE
11
12 #include "lua.h"
13
14 #include "lobject.h"
15 #include "lstate.h"
16 #include "lundump.h"
17
18 typedef struct {
19 lua_State* L;
20 lua_Writer writer;
21 void* data;
22 int strip;
23 int status;
24 } DumpState;
25
26 #define DumpMem(b,n,size,D) DumpBlock(b,(n)*(size),D)
27 #define DumpVar(x,D) DumpMem(&x,1,sizeof(x),D)
28
29 static void DumpBlock(const void* b, size_t size, DumpState* D)
30 {
31 if (D->status==0)
32 {
33 lua_unlock(D->L);
34 D->status=(*D->writer)(D->L,b,size,D->data);
35 lua_lock(D->L);
36 }
37 }
38
39 static void DumpChar(int y, DumpState* D)
40 {
41 char x=(char)y;
42 DumpVar(x,D);
43 }
44
45 static void DumpInt(int x, DumpState* D)
46 {
47 DumpVar(x,D);
48 }
49
50 static void DumpNumber(lua_Number x, DumpState* D)
51 {
52 DumpVar(x,D);
53 }
54
55 static void DumpVector(const void* b, int n, size_t size, DumpState* D)
56 {
57 DumpInt(n,D);
58 DumpMem(b,n,size,D);
59 }
60
61 static void DumpString(const TString* s, DumpState* D)
62 {
63 if (s==NULL || getstr(s)==NULL)
64 {
65 size_t size=0;
66 DumpVar(size,D);
67 }
68 else
69 {
70 size_t size=s->tsv.len+1; /* include trailing '\0' */
71 DumpVar(size,D);
72 DumpBlock(getstr(s),size,D);
73 }
74 }
75
76 #define DumpCode(f,D) DumpVector(f->code,f->sizecode,sizeof(Instruction),D)
77
78 static void DumpFunction(const Proto* f, const TString* p, DumpState* D);
79
80 static void DumpConstants(const Proto* f, DumpState* D)
81 {
82 int i,n=f->sizek;
83 DumpInt(n,D);
84 for (i=0; i<n; i++)
85 {
86 const TValue* o=&f->k[i];
87 DumpChar(ttype(o),D);
88 switch (ttype(o))
89 {
90 case LUA_TNIL:
91 break;
92 case LUA_TBOOLEAN:
93 DumpChar(bvalue(o),D);
94 break;
95 case LUA_TNUMBER:
96 DumpNumber(nvalue(o),D);
97 break;
98 case LUA_TSTRING:
99 DumpString(rawtsvalue(o),D);
100 break;
101 default:
102 lua_assert(0); /* cannot happen */
103 break;
104 }
105 }
106 n=f->sizep;
107 DumpInt(n,D);
108 for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);
109 }
110
111 static void DumpDebug(const Proto* f, DumpState* D)
112 {
113 int i,n;
114 n= (D->strip) ? 0 : f->sizelineinfo;
115 DumpVector(f->lineinfo,n,sizeof(int),D);
116 n= (D->strip) ? 0 : f->sizelocvars;
117 DumpInt(n,D);
118 for (i=0; i<n; i++)
119 {
120 DumpString(f->locvars[i].varname,D);
121 DumpInt(f->locvars[i].startpc,D);
122 DumpInt(f->locvars[i].endpc,D);
123 }
124 n= (D->strip) ? 0 : f->sizeupvalues;
125 DumpInt(n,D);
126 for (i=0; i<n; i++) DumpString(f->upvalues[i],D);
127 }
128
129 static void DumpFunction(const Proto* f, const TString* p, DumpState* D)
130 {
131 DumpString((f->source==p || D->strip) ? NULL : f->source,D);
132 DumpInt(f->linedefined,D);
133 DumpInt(f->lastlinedefined,D);
134 DumpChar(f->nups,D);
135 DumpChar(f->numparams,D);
136 DumpChar(f->is_vararg,D);
137 DumpChar(f->maxstacksize,D);
138 DumpCode(f,D);
139 DumpConstants(f,D);
140 DumpDebug(f,D);
141 }
142
143 static void DumpHeader(DumpState* D)
144 {
145 char h[LUAC_HEADERSIZE];
146 luaU_header(h);
147 DumpBlock(h,LUAC_HEADERSIZE,D);
148 }
149
150 /*
151 ** dump Lua function as precompiled chunk
152 */
153 int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip)
154 {
155 DumpState D;
156 D.L=L;
157 D.writer=w;
158 D.data=data;
159 D.strip=strip;
160 D.status=0;
161 DumpHeader(&D);
162 DumpFunction(f,NULL,&D);
163 return D.status;
164 }
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