liblua/ldump.c

   1 /*
   2 ** $Id: ldump.c,v 2.17 2012/01/23 23:02:10 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)
  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
  78 static void DumpFunction(const Proto* f, 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(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
 109 static 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
 120 static 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
 139 static 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
 152 static 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 */
 162 int 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 }