322 lines
6.2 KiB
C
322 lines
6.2 KiB
C
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/*
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** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
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** load precompiled Lua chunks
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** See Copyright Notice in lua.h
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*/
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#define lundump_c
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#define LUA_CORE
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#include "lua.h"
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#include <string.h>
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstring.h"
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#include "lundump.h"
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#include "lzio.h"
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typedef struct {
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lua_State* L;
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ZIO* Z;
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Mbuffer* b;
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const char* name;
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int swap;
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int numsize;
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int toflt;
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size_t total;
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} LoadState;
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#ifdef LUAC_TRUST_BINARIES
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#define IF(c,s)
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#define error(S,s)
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#else
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#define IF(c,s) if (c) error(S,s)
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static void error(LoadState* S, const char* why)
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{
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luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
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luaD_throw(S->L,LUA_ERRSYNTAX);
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}
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#endif
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#define LoadByte(S) (lu_byte)LoadChar(S)
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#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
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#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
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static void LoadBlock(LoadState* S, void* b, size_t size)
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{
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size_t r=luaZ_read(S->Z,b,size);
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IF (r!=0, "unexpected end");
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S->total+=size;
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}
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static void LoadMem (LoadState* S, void* b, int n, size_t size)
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{
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LoadBlock(S,b,n*size);
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if (S->swap && b)
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{
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char* p=(char*) b;
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char c;
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switch (size)
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{
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case 1:
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break;
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case 2:
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while (n--)
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{
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c=p[0]; p[0]=p[1]; p[1]=c;
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p+=2;
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}
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break;
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case 4:
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while (n--)
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{
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c=p[0]; p[0]=p[3]; p[3]=c;
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c=p[1]; p[1]=p[2]; p[2]=c;
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p+=4;
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}
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break;
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case 8:
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while (n--)
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{
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c=p[0]; p[0]=p[7]; p[7]=c;
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c=p[1]; p[1]=p[6]; p[6]=c;
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c=p[2]; p[2]=p[5]; p[5]=c;
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c=p[3]; p[3]=p[4]; p[4]=c;
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p+=8;
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}
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break;
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default:
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IF(1, "bad size");
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break;
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}
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}
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}
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static int LoadChar(LoadState* S)
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{
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char x;
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LoadVar(S,x);
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return x;
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}
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static void Align4(LoadState* S)
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{
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while(S->total&3)
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LoadChar(S);
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}
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static int LoadInt(LoadState* S)
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{
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int x;
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LoadVar(S,x);
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IF (x<0, "bad integer");
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return x;
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}
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static lua_Number LoadNumber(LoadState* S)
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{
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lua_Number x;
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if(S->toflt)
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{
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switch(S->numsize)
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{
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case 1: {
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int8_t y;
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LoadVar(S,y);
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x = (lua_Number)y;
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} break;
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case 2: {
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int16_t y;
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LoadVar(S,y);
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x = (lua_Number)y;
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} break;
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case 4: {
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int32_t y;
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LoadVar(S,y);
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x = (lua_Number)y;
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} break;
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case 8: {
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int64_t y;
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LoadVar(S,y);
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x = (lua_Number)y;
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} break;
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default: lua_assert(0);
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}
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}
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else
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{
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LoadVar(S,x); /* should probably handle more cases for float here... */
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}
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return x;
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}
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static TString* LoadString(LoadState* S)
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{
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int32_t size;
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LoadVar(S,size);
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if (size==0)
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return NULL;
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else
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{
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char* s = luaZ_openspace(S->L,S->b,size);
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LoadBlock(S,s,size);
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return luaS_newlstr(S->L,s,size-1); /* remove trailing zero */
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}
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}
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static void LoadCode(LoadState* S, Proto* f)
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{
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int n=LoadInt(S);
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Align4(S);
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f->code=luaM_newvector(S->L,n,Instruction);
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LoadVector(S,f->code,n,sizeof(Instruction));
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f->sizecode=n;
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}
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static Proto* LoadFunction(LoadState* S, TString* p);
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static void LoadConstants(LoadState* S, Proto* f)
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{
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int i,n;
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n=LoadInt(S);
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f->k=luaM_newvector(S->L,n,TValue);
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f->sizek=n;
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for (i=0; i<n; i++) setnilvalue(&f->k[i]);
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for (i=0; i<n; i++)
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{
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TValue* o=&f->k[i];
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int t=LoadChar(S);
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switch (t)
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{
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case LUA_TNIL:
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setnilvalue(o);
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break;
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case LUA_TBOOLEAN:
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setbvalue(o,LoadChar(S)!=0);
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break;
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case LUA_TNUMBER:
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setnvalue(o,LoadNumber(S));
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break;
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case LUA_TSTRING:
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setsvalue2n(S->L,o,LoadString(S));
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break;
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default:
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error(S,"bad constant");
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break;
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}
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}
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n=LoadInt(S);
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f->p=luaM_newvector(S->L,n,Proto*);
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f->sizep=n;
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for (i=0; i<n; i++) f->p[i]=NULL;
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for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
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}
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static void LoadDebug(LoadState* S, Proto* f)
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{
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int i,n;
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n=LoadInt(S);
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Align4(S);
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if(n) {
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f->packedlineinfo=luaM_newvector(S->L,n,unsigned char);
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LoadBlock(S,f->packedlineinfo,n);
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} else {
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f->packedlineinfo=NULL;
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}
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n=LoadInt(S);
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f->locvars=luaM_newvector(S->L,n,LocVar);
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f->sizelocvars=n;
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for (i=0; i<n; i++) f->locvars[i].varname=NULL;
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for (i=0; i<n; i++)
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{
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f->locvars[i].varname=LoadString(S);
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f->locvars[i].startpc=LoadInt(S);
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f->locvars[i].endpc=LoadInt(S);
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}
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n=LoadInt(S);
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f->upvalues=luaM_newvector(S->L,n,TString*);
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f->sizeupvalues=n;
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for (i=0; i<n; i++) f->upvalues[i]=NULL;
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for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
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}
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static Proto* LoadFunction(LoadState* S, TString* p)
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{
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Proto* f;
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if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
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f=luaF_newproto(S->L);
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setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
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f->source=LoadString(S); if (f->source==NULL) f->source=p;
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f->linedefined=LoadInt(S);
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f->lastlinedefined=LoadInt(S);
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f->nups=LoadByte(S);
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f->numparams=LoadByte(S);
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f->is_vararg=LoadByte(S);
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f->maxstacksize=LoadByte(S);
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LoadCode(S,f);
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LoadConstants(S,f);
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LoadDebug(S,f);
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IF (!luaG_checkcode(f), "bad code");
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S->L->top--;
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S->L->nCcalls--;
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return f;
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}
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static void LoadHeader(LoadState* S)
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{
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char h[LUAC_HEADERSIZE];
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char s[LUAC_HEADERSIZE];
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int intck = (((lua_Number)0.5)==0); /* 0=float, 1=int */
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luaU_header(h);
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LoadBlock(S,s,LUAC_HEADERSIZE);
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S->swap=(s[6]!=h[6]); s[6]=h[6]; /* Check if byte-swapping is needed */
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S->numsize=h[10]=s[10]; /* length of lua_Number */
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S->toflt=(s[11]>intck); /* check if conversion from int lua_Number to flt is needed */
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if(S->toflt) s[11]=h[11];
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IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
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}
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/*
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** load precompiled chunk
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*/
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Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
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{
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LoadState S;
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if (*name=='@' || *name=='=')
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S.name=name+1;
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else if (*name==LUA_SIGNATURE[0])
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S.name="binary string";
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else
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S.name=name;
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S.L=L;
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S.Z=Z;
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S.b=buff;
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LoadHeader(&S);
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S.total=0;
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return LoadFunction(&S,luaS_newliteral(L,"=?"));
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}
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/*
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* make header
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*/
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void luaU_header (char* h)
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{
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int x=1;
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memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
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h+=sizeof(LUA_SIGNATURE)-1;
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*h++=(char)LUAC_VERSION;
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*h++=(char)LUAC_FORMAT;
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*h++=(char)*(char*)&x; /* endianness */
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*h++=(char)sizeof(int);
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*h++=(char)sizeof(int32_t);
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*h++=(char)sizeof(Instruction);
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*h++=(char)sizeof(lua_Number);
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*h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */
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}
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