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1866
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1 /*
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2 ** $Id: lundump.c,v 2.22 2012/05/08 13:53:33 roberto Exp $
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3 ** load precompiled Lua chunks
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7 #include <string.h>
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8
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9 #define lundump_c
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10 #define LUA_CORE
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11
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12 #include "lua.h"
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13
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14 #include "ldebug.h"
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15 #include "ldo.h"
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16 #include "lfunc.h"
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17 #include "lmem.h"
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18 #include "lobject.h"
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19 #include "lstring.h"
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20 #include "lundump.h"
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21 #include "lzio.h"
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22
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23 typedef struct {
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24 lua_State* L;
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25 ZIO* Z;
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26 Mbuffer* b;
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27 const char* name;
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28 } LoadState;
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29
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30 static l_noret error(LoadState* S, const char* why)
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31 {
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32 luaO_pushfstring(S->L,"%s: %s precompiled chunk",S->name,why);
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33 luaD_throw(S->L,LUA_ERRSYNTAX);
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34 }
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35
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36 #define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
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37 #define LoadByte(S) (lu_byte)LoadChar(S)
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38 #define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
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39 #define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
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40
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41 #if !defined(luai_verifycode)
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42 #define luai_verifycode(L,b,f) /* empty */
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43 #endif
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44
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45 static void LoadBlock(LoadState* S, void* b, size_t size)
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46 {
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47 if (luaZ_read(S->Z,b,size)!=0) error(S,"truncated");
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48 }
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49
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50 static int LoadChar(LoadState* S)
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51 {
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52 char x;
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53 LoadVar(S,x);
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54 return x;
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55 }
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56
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57 static int LoadInt(LoadState* S)
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58 {
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59 int x;
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60 LoadVar(S,x);
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61 if (x<0) error(S,"corrupted");
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62 return x;
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63 }
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64
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65 static lua_Number LoadNumber(LoadState* S)
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66 {
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67 lua_Number x;
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68 LoadVar(S,x);
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69 return x;
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70 }
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71
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72 static TString* LoadString(LoadState* S)
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73 {
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74 size_t size;
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75 LoadVar(S,size);
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76 if (size==0)
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77 return NULL;
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78 else
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79 {
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80 char* s=luaZ_openspace(S->L,S->b,size);
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81 LoadBlock(S,s,size*sizeof(char));
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82 return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
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83 }
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84 }
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85
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86 static void LoadCode(LoadState* S, Proto* f)
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87 {
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88 int n=LoadInt(S);
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89 f->code=luaM_newvector(S->L,n,Instruction);
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90 f->sizecode=n;
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91 LoadVector(S,f->code,n,sizeof(Instruction));
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92 }
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93
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94 static void LoadFunction(LoadState* S, Proto* f);
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95
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96 static void LoadConstants(LoadState* S, Proto* f)
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97 {
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98 int i,n;
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99 n=LoadInt(S);
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100 f->k=luaM_newvector(S->L,n,TValue);
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101 f->sizek=n;
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102 for (i=0; i<n; i++) setnilvalue(&f->k[i]);
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103 for (i=0; i<n; i++)
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104 {
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105 TValue* o=&f->k[i];
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106 int t=LoadChar(S);
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107 switch (t)
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108 {
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109 case LUA_TNIL:
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110 setnilvalue(o);
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111 break;
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112 case LUA_TBOOLEAN:
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113 setbvalue(o,LoadChar(S));
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114 break;
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115 case LUA_TNUMBER:
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116 setnvalue(o,LoadNumber(S));
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117 break;
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118 case LUA_TSTRING:
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119 setsvalue2n(S->L,o,LoadString(S));
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120 break;
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121 default: lua_assert(0);
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122 }
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123 }
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124 n=LoadInt(S);
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125 f->p=luaM_newvector(S->L,n,Proto*);
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126 f->sizep=n;
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127 for (i=0; i<n; i++) f->p[i]=NULL;
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128 for (i=0; i<n; i++)
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129 {
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130 f->p[i]=luaF_newproto(S->L);
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131 LoadFunction(S,f->p[i]);
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132 }
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133 }
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134
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135 static void LoadUpvalues(LoadState* S, Proto* f)
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136 {
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137 int i,n;
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138 n=LoadInt(S);
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139 f->upvalues=luaM_newvector(S->L,n,Upvaldesc);
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140 f->sizeupvalues=n;
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141 for (i=0; i<n; i++) f->upvalues[i].name=NULL;
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142 for (i=0; i<n; i++)
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143 {
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144 f->upvalues[i].instack=LoadByte(S);
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145 f->upvalues[i].idx=LoadByte(S);
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146 }
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147 }
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148
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149 static void LoadDebug(LoadState* S, Proto* f)
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150 {
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151 int i,n;
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152 f->source=LoadString(S);
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153 n=LoadInt(S);
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154 f->lineinfo=luaM_newvector(S->L,n,int);
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155 f->sizelineinfo=n;
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156 LoadVector(S,f->lineinfo,n,sizeof(int));
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157 n=LoadInt(S);
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158 f->locvars=luaM_newvector(S->L,n,LocVar);
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159 f->sizelocvars=n;
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160 for (i=0; i<n; i++) f->locvars[i].varname=NULL;
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161 for (i=0; i<n; i++)
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162 {
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163 f->locvars[i].varname=LoadString(S);
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164 f->locvars[i].startpc=LoadInt(S);
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165 f->locvars[i].endpc=LoadInt(S);
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166 }
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167 n=LoadInt(S);
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168 for (i=0; i<n; i++) f->upvalues[i].name=LoadString(S);
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169 }
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170
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171 static void LoadFunction(LoadState* S, Proto* f)
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172 {
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173 f->linedefined=LoadInt(S);
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174 f->lastlinedefined=LoadInt(S);
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175 f->numparams=LoadByte(S);
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176 f->is_vararg=LoadByte(S);
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177 f->maxstacksize=LoadByte(S);
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178 LoadCode(S,f);
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179 LoadConstants(S,f);
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180 LoadUpvalues(S,f);
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181 LoadDebug(S,f);
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182 }
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183
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184 /* the code below must be consistent with the code in luaU_header */
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185 #define N0 LUAC_HEADERSIZE
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186 #define N1 (sizeof(LUA_SIGNATURE)-sizeof(char))
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187 #define N2 N1+2
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188 #define N3 N2+6
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189
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190 static void LoadHeader(LoadState* S)
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191 {
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192 lu_byte h[LUAC_HEADERSIZE];
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193 lu_byte s[LUAC_HEADERSIZE];
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194 luaU_header(h);
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195 memcpy(s,h,sizeof(char)); /* first char already read */
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196 LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char));
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197 if (memcmp(h,s,N0)==0) return;
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198 if (memcmp(h,s,N1)!=0) error(S,"not a");
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199 if (memcmp(h,s,N2)!=0) error(S,"version mismatch in");
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200 if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted");
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201 }
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202
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203 /*
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204 ** load precompiled chunk
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205 */
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206 Closure* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
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207 {
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208 LoadState S;
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209 Closure* cl;
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210 if (*name=='@' || *name=='=')
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211 S.name=name+1;
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212 else if (*name==LUA_SIGNATURE[0])
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213 S.name="binary string";
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214 else
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215 S.name=name;
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216 S.L=L;
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217 S.Z=Z;
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218 S.b=buff;
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219 LoadHeader(&S);
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220 cl=luaF_newLclosure(L,1);
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221 setclLvalue(L,L->top,cl); incr_top(L);
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222 cl->l.p=luaF_newproto(L);
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223 LoadFunction(&S,cl->l.p);
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224 if (cl->l.p->sizeupvalues != 1)
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225 {
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226 Proto* p=cl->l.p;
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227 cl=luaF_newLclosure(L,cl->l.p->sizeupvalues);
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228 cl->l.p=p;
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229 setclLvalue(L,L->top-1,cl);
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230 }
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231 luai_verifycode(L,buff,cl->l.p);
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232 return cl;
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233 }
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234
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235 #define MYINT(s) (s[0]-'0')
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236 #define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR)
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237 #define FORMAT 0 /* this is the official format */
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238
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239 /*
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240 * make header for precompiled chunks
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241 * if you change the code below be sure to update LoadHeader and FORMAT above
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242 * and LUAC_HEADERSIZE in lundump.h
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243 */
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244 void luaU_header (lu_byte* h)
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245 {
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246 int x=1;
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247 memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char));
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248 h+=sizeof(LUA_SIGNATURE)-sizeof(char);
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249 *h++=cast_byte(VERSION);
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250 *h++=cast_byte(FORMAT);
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251 *h++=cast_byte(*(char*)&x); /* endianness */
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252 *h++=cast_byte(sizeof(int));
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253 *h++=cast_byte(sizeof(size_t));
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254 *h++=cast_byte(sizeof(Instruction));
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255 *h++=cast_byte(sizeof(lua_Number));
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256 *h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */
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257 memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char));
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258 }
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