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Rev | Author | Line No. | Line |
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5205 | clevermous | 1 | /* |
2 | ** $Id: lundump.c,v 1.71 2011/12/07 10:39:12 lhf 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 | |||
7 | #include |
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8 | |||
9 | #define lundump_c |
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10 | #define LUA_CORE |
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11 | |||
12 | #include "lua.h" |
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13 | |||
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 | |||
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 | |||
30 | static void 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 | |||
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 | |||
41 | #if !defined(luai_verifycode) |
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42 | #define luai_verifycode(L,b,f) (f) |
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43 | #endif |
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44 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
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 | |||
94 | static Proto* LoadFunction(LoadState* S); |
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95 | |||
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 |
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103 | for (i=0; 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 | } |
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122 | } |
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123 | n=LoadInt(S); |
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124 | f->p=luaM_newvector(S->L,n,Proto*); |
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125 | f->sizep=n; |
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126 | for (i=0; i |
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127 | for (i=0; i |
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128 | } |
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129 | |||
130 | static void LoadUpvalues(LoadState* S, Proto* f) |
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131 | { |
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132 | int i,n; |
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133 | n=LoadInt(S); |
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134 | f->upvalues=luaM_newvector(S->L,n,Upvaldesc); |
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135 | f->sizeupvalues=n; |
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136 | for (i=0; i |
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137 | for (i=0; i |
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138 | { |
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139 | f->upvalues[i].instack=LoadByte(S); |
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140 | f->upvalues[i].idx=LoadByte(S); |
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141 | } |
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142 | } |
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143 | |||
144 | static void LoadDebug(LoadState* S, Proto* f) |
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145 | { |
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146 | int i,n; |
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147 | f->source=LoadString(S); |
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148 | n=LoadInt(S); |
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149 | f->lineinfo=luaM_newvector(S->L,n,int); |
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150 | f->sizelineinfo=n; |
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151 | LoadVector(S,f->lineinfo,n,sizeof(int)); |
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152 | n=LoadInt(S); |
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153 | f->locvars=luaM_newvector(S->L,n,LocVar); |
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154 | f->sizelocvars=n; |
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155 | for (i=0; i |
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156 | for (i=0; i |
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157 | { |
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158 | f->locvars[i].varname=LoadString(S); |
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159 | f->locvars[i].startpc=LoadInt(S); |
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160 | f->locvars[i].endpc=LoadInt(S); |
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161 | } |
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162 | n=LoadInt(S); |
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163 | for (i=0; i |
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164 | } |
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165 | |||
166 | static Proto* LoadFunction(LoadState* S) |
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167 | { |
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168 | Proto* f=luaF_newproto(S->L); |
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169 | setptvalue2s(S->L,S->L->top,f); incr_top(S->L); |
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170 | f->linedefined=LoadInt(S); |
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171 | f->lastlinedefined=LoadInt(S); |
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172 | f->numparams=LoadByte(S); |
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173 | f->is_vararg=LoadByte(S); |
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174 | f->maxstacksize=LoadByte(S); |
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175 | LoadCode(S,f); |
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176 | LoadConstants(S,f); |
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177 | LoadUpvalues(S,f); |
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178 | LoadDebug(S,f); |
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179 | S->L->top--; |
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180 | return f; |
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181 | } |
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182 | |||
183 | /* the code below must be consistent with the code in luaU_header */ |
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184 | #define N0 LUAC_HEADERSIZE |
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185 | #define N1 (sizeof(LUA_SIGNATURE)-sizeof(char)) |
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186 | #define N2 N1+2 |
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187 | #define N3 N2+6 |
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188 | |||
189 | static void LoadHeader(LoadState* S) |
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190 | { |
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191 | lu_byte h[LUAC_HEADERSIZE]; |
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192 | lu_byte s[LUAC_HEADERSIZE]; |
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193 | luaU_header(h); |
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194 | memcpy(s,h,sizeof(char)); /* first char already read */ |
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195 | LoadBlock(S,s+sizeof(char),LUAC_HEADERSIZE-sizeof(char)); |
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196 | if (memcmp(h,s,N0)==0) return; |
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197 | if (memcmp(h,s,N1)!=0) error(S,"not a"); |
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198 | if (memcmp(h,s,N2)!=0) error(S,"version mismatch in"); |
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199 | if (memcmp(h,s,N3)!=0) error(S,"incompatible"); else error(S,"corrupted"); |
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200 | } |
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201 | |||
202 | /* |
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203 | ** load precompiled chunk |
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204 | */ |
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205 | Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name) |
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206 | { |
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207 | LoadState S; |
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208 | if (*name=='@' || *name=='=') |
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209 | S.name=name+1; |
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210 | else if (*name==LUA_SIGNATURE[0]) |
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211 | S.name="binary string"; |
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212 | else |
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213 | S.name=name; |
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214 | S.L=L; |
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215 | S.Z=Z; |
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216 | S.b=buff; |
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217 | LoadHeader(&S); |
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218 | return luai_verifycode(L,buff,LoadFunction(&S)); |
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219 | } |
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220 | |||
221 | #define MYINT(s) (s[0]-'0') |
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222 | #define VERSION MYINT(LUA_VERSION_MAJOR)*16+MYINT(LUA_VERSION_MINOR) |
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223 | #define FORMAT 0 /* this is the official format */ |
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224 | |||
225 | /* |
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226 | * make header for precompiled chunks |
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227 | * if you change the code below be sure to update LoadHeader and FORMAT above |
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228 | * and LUAC_HEADERSIZE in lundump.h |
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229 | */ |
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230 | void luaU_header (lu_byte* h) |
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231 | { |
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232 | int x=1; |
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233 | memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-sizeof(char)); |
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234 | h+=sizeof(LUA_SIGNATURE)-sizeof(char); |
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235 | *h++=cast_byte(VERSION); |
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236 | *h++=cast_byte(FORMAT); |
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237 | *h++=cast_byte(*(char*)&x); /* endianness */ |
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238 | *h++=cast_byte(sizeof(int)); |
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239 | *h++=cast_byte(sizeof(size_t)); |
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240 | *h++=cast_byte(sizeof(Instruction)); |
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241 | *h++=cast_byte(sizeof(lua_Number)); |
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242 | *h++=cast_byte(((lua_Number)0.5)==0); /* is lua_Number integral? */ |
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243 | memcpy(h,LUAC_TAIL,sizeof(LUAC_TAIL)-sizeof(char)); |
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244 | }0)> |