mirror of
https://github.com/lua/lua
synced 2024-11-22 21:01:26 +03:00
use of `LoadState' struct (instead of several separate arguments)
This commit is contained in:
Roberto Ierusalimschy
parent
b6791f5fa5
commit
221b5be7b7
213
lundump.c
213
lundump.c
@ -1,5 +1,5 @@
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/*
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** $Id: lundump.c,v 1.50 2002/06/17 13:51:01 roberto Exp roberto $
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** $Id: lundump.c,v 1.43 2002/08/07 00:36:03 lhf Exp $
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** load pre-compiled Lua chunks
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** See Copyright Notice in lua.h
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*/
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@ -16,216 +16,212 @@
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#define LoadByte (lu_byte) ezgetc
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static const char* ZNAME (ZIO* Z)
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typedef struct {
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lua_State* L;
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ZIO* Z;
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int swap;
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const char* name;
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} LoadState;
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static void unexpectedEOZ (LoadState* S)
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{
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const char* s=zname(Z);
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if (*s=='@' || *s=='=')
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return s+1;
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else if (*s==LUA_SIGNATURE[0])
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return "binary string";
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else
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return s;
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luaG_runerror(S->L,"unexpected end of file in %s",S->name);
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}
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static void unexpectedEOZ (lua_State* L, ZIO* Z)
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static int ezgetc (LoadState* S)
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{
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luaG_runerror(L,"unexpected end of file in %s",ZNAME(Z));
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}
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static int ezgetc (lua_State* L, ZIO* Z)
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{
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int c=zgetc(Z);
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if (c==EOZ) unexpectedEOZ(L,Z);
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int c=zgetc(S->Z);
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if (c==EOZ) unexpectedEOZ(S);
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return c;
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}
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static void ezread (lua_State* L, ZIO* Z, void* b, int n)
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static void ezread (LoadState* S, void* b, int n)
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{
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int r=luaZ_read(Z,b,n);
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if (r!=0) unexpectedEOZ(L,Z);
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int r=luaZ_read(S->Z,b,n);
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if (r!=0) unexpectedEOZ(S);
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}
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static void LoadBlock (lua_State* L, void* b, size_t size, ZIO* Z, int swap)
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static void LoadBlock (LoadState* S, void* b, size_t size)
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{
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if (swap)
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if (S->swap)
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{
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char *p=(char*) b+size-1;
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int n=size;
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while (n--) *p--=(char)ezgetc(L,Z);
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while (n--) *p--=(char)ezgetc(S);
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}
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else
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ezread(L,Z,b,size);
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ezread(S,b,size);
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}
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static void LoadVector (lua_State* L, void* b, int m, size_t size, ZIO* Z, int swap)
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static void LoadVector (LoadState* S, void* b, int m, size_t size)
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{
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if (swap)
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if (S->swap)
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{
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char *q=(char*) b;
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while (m--)
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{
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char *p=q+size-1;
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int n=size;
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while (n--) *p--=(char)ezgetc(L,Z);
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while (n--) *p--=(char)ezgetc(S);
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q+=size;
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}
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}
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else
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ezread(L,Z,b,m*size);
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ezread(S,b,m*size);
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}
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static int LoadInt (lua_State* L, ZIO* Z, int swap)
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static int LoadInt (LoadState* S)
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{
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int x;
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LoadBlock(L,&x,sizeof(x),Z,swap);
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if (x<0) luaG_runerror(L,"bad integer in %s",ZNAME(Z));
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LoadBlock(S,&x,sizeof(x));
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if (x<0) luaG_runerror(S->L,"bad integer in %s",S->name);
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return x;
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}
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static size_t LoadSize (lua_State* L, ZIO* Z, int swap)
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static size_t LoadSize (LoadState* S)
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{
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size_t x;
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LoadBlock(L,&x,sizeof(x),Z,swap);
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LoadBlock(S,&x,sizeof(x));
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return x;
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}
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static lua_Number LoadNumber (lua_State* L, ZIO* Z, int swap)
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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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LoadBlock(L,&x,sizeof(x),Z,swap);
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LoadBlock(S,&x,sizeof(x));
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return x;
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}
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static TString* LoadString (lua_State* L, ZIO* Z, int swap)
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static TString* LoadString (LoadState* S)
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{
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size_t size=LoadSize(L,Z,swap);
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size_t size=LoadSize(S);
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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=luaO_openspace(L,size,char);
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LoadBlock(L,s,size,Z,0);
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return luaS_newlstr(L,s,size-1); /* remove trailing '\0' */
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char* s=luaO_openspace(S->L,size,char);
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ezread(S,s,size);
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return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
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}
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}
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static void LoadCode (lua_State* L, Proto* f, ZIO* Z, int swap)
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static void LoadCode (LoadState* S, Proto* f)
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{
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int size=LoadInt(L,Z,swap);
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f->code=luaM_newvector(L,size,Instruction);
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int size=LoadInt(S);
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f->code=luaM_newvector(S->L,size,Instruction);
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f->sizecode=size;
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LoadVector(L,f->code,size,sizeof(*f->code),Z,swap);
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LoadVector(S,f->code,size,sizeof(*f->code));
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}
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static void LoadLocals (lua_State* L, Proto* f, ZIO* Z, int swap)
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static void LoadLocals (LoadState* S, Proto* f)
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{
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int i,n;
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n=LoadInt(L,Z,swap);
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f->locvars=luaM_newvector(L,n,LocVar);
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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++)
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{
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f->locvars[i].varname=LoadString(L,Z,swap);
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f->locvars[i].startpc=LoadInt(L,Z,swap);
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f->locvars[i].endpc=LoadInt(L,Z,swap);
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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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}
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static void LoadLines (lua_State* L, Proto* f, ZIO* Z, int swap)
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static void LoadLines (LoadState* S, Proto* f)
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{
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int n;
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n=LoadInt(L,Z,swap);
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f->lineinfo=luaM_newvector(L,n,int);
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LoadVector(L,f->lineinfo,n,sizeof(*f->lineinfo),Z,swap);
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n=LoadInt(S);
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f->lineinfo=luaM_newvector(S->L,n,int);
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LoadVector(S,f->lineinfo,n,sizeof(*f->lineinfo));
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}
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static Proto* LoadFunction (lua_State* L, TString* p, ZIO* Z, int swap);
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static Proto* LoadFunction (LoadState* S, TString* p);
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static void LoadConstants (lua_State* L, Proto* f, ZIO* Z, int swap)
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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(L,Z,swap);
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f->k=luaM_newvector(L,n,TObject);
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n=LoadInt(S);
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f->k=luaM_newvector(S->L,n,TObject);
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f->sizek=n;
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for (i=0; i<n; i++)
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{
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TObject* o=&f->k[i];
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int t=LoadByte(L,Z);
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int t=LoadByte(S);
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switch (t)
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{
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case LUA_TNUMBER:
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setnvalue(o,LoadNumber(L,Z,swap));
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setnvalue(o,LoadNumber(S));
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break;
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case LUA_TSTRING:
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setsvalue(o,LoadString(L,Z,swap));
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setsvalue(o,LoadString(S));
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break;
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case LUA_TNIL:
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setnilvalue(o);
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break;
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default:
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luaG_runerror(L,"bad constant type (%d) in %s",t,ZNAME(Z));
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luaG_runerror(S->L,"bad constant type (%d) in %s",t,S->name);
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break;
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}
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}
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n=LoadInt(L,Z,swap);
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f->p=luaM_newvector(L,n,Proto*);
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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]=LoadFunction(L,f->source,Z,swap);
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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 Proto* LoadFunction (lua_State* L, TString* p, ZIO* Z, int swap)
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static Proto* LoadFunction (LoadState* S, TString* p)
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{
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Proto* f=luaF_newproto(L);
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f->source=LoadString(L,Z,swap); if (f->source==NULL) f->source=p;
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f->lineDefined=LoadInt(L,Z,swap);
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f->nupvalues=LoadByte(L,Z);
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f->numparams=LoadByte(L,Z);
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f->is_vararg=LoadByte(L,Z);
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f->maxstacksize=LoadByte(L,Z);
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LoadLocals(L,f,Z,swap);
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LoadLines(L,f,Z,swap);
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LoadConstants(L,f,Z,swap);
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LoadCode(L,f,Z,swap);
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Proto* f=luaF_newproto(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->nupvalues=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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LoadLocals(S,f);
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LoadLines(S,f);
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LoadConstants(S,f);
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LoadCode(S,f);
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#ifndef TRUST_BINARIES
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if (!luaG_checkcode(f)) luaG_runerror(L,"bad code in %s",ZNAME(Z));
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if (!luaG_checkcode(f)) luaG_runerror(S->L,"bad code in %s",S->name);
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#endif
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return f;
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}
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static void LoadSignature (lua_State* L, ZIO* Z)
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static void LoadSignature (LoadState* S)
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{
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const char* s=LUA_SIGNATURE;
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while (*s!=0 && ezgetc(L,Z)==*s)
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while (*s!=0 && ezgetc(S)==*s)
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++s;
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if (*s!=0) luaG_runerror(L,"bad signature in %s",ZNAME(Z));
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if (*s!=0) luaG_runerror(S->L,"bad signature in %s",S->name);
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}
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static void TestSize (lua_State* L, int s, const char* what, ZIO* Z)
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static void TestSize (LoadState* S, int s, const char* what)
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{
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int r=LoadByte(L,Z);
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int r=LoadByte(S);
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if (r!=s)
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luaG_runerror(L,"virtual machine mismatch in %s: "
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"size of %s is %d but read %d",ZNAME(Z),what,s,r);
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luaG_runerror(S->L,"virtual machine mismatch in %s: "
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"size of %s is %d but read %d",S->name,what,s,r);
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}
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#define TESTSIZE(s,w) TestSize(L,s,w,Z)
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#define TESTSIZE(s,w) TestSize(S,s,w)
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#define V(v) v/16,v%16
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static int LoadHeader (lua_State* L, ZIO* Z)
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static void LoadHeader (LoadState* S)
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{
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int version,swap;
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int version;
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lua_Number x=0,tx=TEST_NUMBER;
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LoadSignature(L,Z);
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version=LoadByte(L,Z);
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LoadSignature(S);
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version=LoadByte(S);
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if (version>VERSION)
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luaG_runerror(L,"%s too new: "
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luaG_runerror(S->L,"%s too new: "
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"read version %d.%d; expected at most %d.%d",
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ZNAME(Z),V(version),V(VERSION));
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S->name,V(version),V(VERSION));
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if (version<VERSION0) /* check last major change */
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luaG_runerror(L,"%s too old: "
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luaG_runerror(S->L,"%s too old: "
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"read version %d.%d; expected at least %d.%d",
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ZNAME(Z),V(version),V(VERSION0));
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swap=(luaU_endianness()!=LoadByte(L,Z)); /* need to swap bytes? */
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S->name,V(version),V(VERSION0));
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S->swap=(luaU_endianness()!=LoadByte(S)); /* need to swap bytes? */
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TESTSIZE(sizeof(int),"int");
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TESTSIZE(sizeof(size_t), "size_t");
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TESTSIZE(sizeof(Instruction), "Instruction");
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@ -234,16 +230,16 @@ static int LoadHeader (lua_State* L, ZIO* Z)
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TESTSIZE(SIZE_B, "B");
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TESTSIZE(SIZE_C, "C");
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TESTSIZE(sizeof(lua_Number), "number");
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x=LoadNumber(L,Z,swap);
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x=LoadNumber(S);
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if ((long)x!=(long)tx) /* disregard errors in last bits of fraction */
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luaG_runerror(L,"unknown number format in %s: read %f; expected %f",
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ZNAME(Z),x,tx);
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return swap;
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luaG_runerror(S->L,"unknown number format in %s: read %f; expected %f",
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S->name,x,tx);
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}
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static Proto* LoadChunk (lua_State* L, ZIO* Z)
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static Proto* LoadChunk (LoadState* S)
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{
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return LoadFunction(L,NULL,Z,LoadHeader(L,Z));
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LoadHeader(S);
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return LoadFunction(S,NULL);
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}
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/*
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@ -251,9 +247,20 @@ static Proto* LoadChunk (lua_State* L, ZIO* Z)
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*/
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Proto* luaU_undump (lua_State* L, ZIO* Z)
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{
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Proto* f=LoadChunk(L,Z);
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LoadState S;
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Proto* f;
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const char* s=zname(Z);
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if (*s=='@' || *s=='=')
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S.name=s+1;
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else if (*s==LUA_SIGNATURE[0])
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S.name="binary string";
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else
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S.name=s;
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S.L=L;
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S.Z=Z;
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f=LoadChunk(&S);
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if (zgetc(Z)!=EOZ)
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luaG_runerror(L,"%s apparently contains more than one chunk",ZNAME(Z));
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luaG_runerror(L,"%s apparently contains more than one chunk",S.name);
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return f;
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}
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