/lua/ldump.c

  1/*
  2** $Id: ldump.c,v 2.17.1.1 2013/04/12 18:48:47 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
 18typedef 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
 29static 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
 39static void DumpChar(int y, DumpState* D)
 40{
 41 char x=(char)y;
 42 DumpVar(x,D);
 43}
 44
 45static void DumpInt(int x, DumpState* D)
 46{
 47 DumpVar(x,D);
 48}
 49
 50static void DumpNumber(lua_Number x, DumpState* D)
 51{
 52 DumpVar(x,D);
 53}
 54
 55static 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
 61static void DumpString(const TString* s, DumpState* D)
 62{
 63 if (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*sizeof(char),D);
 73 }
 74}
 75
 76#define DumpCode(f,D)	 DumpVector(f->code,f->sizecode,sizeof(Instruction),D)
 77
 78static void DumpFunction(const Proto* f, DumpState* D);
 79
 80static 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(ttypenv(o),D);
 88  switch (ttypenv(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: lua_assert(0);
102  }
103 }
104 n=f->sizep;
105 DumpInt(n,D);
106 for (i=0; i<n; i++) DumpFunction(f->p[i],D);
107}
108
109static void DumpUpvalues(const Proto* f, DumpState* D)
110{
111 int i,n=f->sizeupvalues;
112 DumpInt(n,D);
113 for (i=0; i<n; i++)
114 {
115  DumpChar(f->upvalues[i].instack,D);
116  DumpChar(f->upvalues[i].idx,D);
117 }
118}
119
120static void DumpDebug(const Proto* f, DumpState* D)
121{
122 int i,n;
123 DumpString((D->strip) ? NULL : f->source,D);
124 n= (D->strip) ? 0 : f->sizelineinfo;
125 DumpVector(f->lineinfo,n,sizeof(int),D);
126 n= (D->strip) ? 0 : f->sizelocvars;
127 DumpInt(n,D);
128 for (i=0; i<n; i++)
129 {
130  DumpString(f->locvars[i].varname,D);
131  DumpInt(f->locvars[i].startpc,D);
132  DumpInt(f->locvars[i].endpc,D);
133 }
134 n= (D->strip) ? 0 : f->sizeupvalues;
135 DumpInt(n,D);
136 for (i=0; i<n; i++) DumpString(f->upvalues[i].name,D);
137}
138
139static void DumpFunction(const Proto* f, DumpState* D)
140{
141 DumpInt(f->linedefined,D);
142 DumpInt(f->lastlinedefined,D);
143 DumpChar(f->numparams,D);
144 DumpChar(f->is_vararg,D);
145 DumpChar(f->maxstacksize,D);
146 DumpCode(f,D);
147 DumpConstants(f,D);
148 DumpUpvalues(f,D);
149 DumpDebug(f,D);
150}
151
152static void DumpHeader(DumpState* D)
153{
154 lu_byte h[LUAC_HEADERSIZE];
155 luaU_header(h);
156 DumpBlock(h,LUAC_HEADERSIZE,D);
157}
158
159/*
160** dump Lua function as precompiled chunk
161*/
162int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip)
163{
164 DumpState D;
165 D.L=L;
166 D.writer=w;
167 D.data=data;
168 D.strip=strip;
169 D.status=0;
170 DumpHeader(&D);
171 DumpFunction(f,&D);
172 return D.status;
173}