Re: Calling a function in a table from C++ without loosing 'self'
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- Subject: Re: Calling a function in a table from C++ without loosing 'self'
- From: Shannon Stewman <stew@...>
- Date: Thu, 9 Jun 2005 13:37:35 -0500
On Thu, Jun 09, 2005 at 09:55:48AM +1200, Russell Y.Webb wrote:
> We need a way to visualize the stack for debugging.
>
> Is there a console based PrintStack(vm) that someone is willing to put
> on the Wiki? I'll write one if no one has it already.
This is my homegrown version.
char* value_description( lua_State* L,
int j,
char* buf,
int size )
{
int typ,len;
char* ret;
const char* value;
// make a copy to tostring/tonumber functions don't change the
// original value
lua_pushvalue( L, j );
typ = lua_type( L, -1 );
ret = NULL;
switch(typ)
{
case LUA_TSTRING:
case LUA_TNUMBER:
value = lua_tostring(L,-1);
len = lua_strlen(L,-1);
copy_with_ellipsis(buf,value,size,len);
break;
case LUA_TBOOLEAN:
value = lua_toboolean(L, -1) ? "TRUE" : "FALSE";
len = strlen(value) + 1;
strncpy( buf, value, size );
buf[size-1] = '0円'; // NULL-terminate, just in case
break;
case LUA_TUSERDATA:
case LUA_TLIGHTUSERDATA:
snprintf( buf, size, "%p", lua_touserdata(L,-1) );
buf[size-1] = '0円';
break;
case LUA_TTHREAD:
case LUA_TTABLE:
case LUA_TFUNCTION:
snprintf( buf, size, "%p", lua_topointer(L,-1) );
buf[size-1] = '0円';
break;
default:
value = "???";
strncpy( buf,value, strlen(value));
buf[size-1] = '0円';
break;
}
lua_pop(L, 1);
return buf;
}
#define WRSTK_BUFSIZE 256
int writestack(FILE* f, lua_State* L)
{
char buf[WRSTK_BUFSIZE];
int ntop,typ,j;
ntop = lua_gettop( L );
for(j = 1; j <= ntop; ++j)
{
typ = lua_type( L, j );
fprintf(f, "[%d]: %s val: %s\n"
, j
, lua_typename(L,typ)
, value_description(L,j,buf,WRSTK_BUFSIZE) );
}
fprintf(f,"\n");
return 0;
}
#undef WRSTK_BUFSIZE
int dumpstack(lua_State* state)
{
return writestack(stderr,state);
}
Cheers!
--
Shannon Stewman | Let us walk through the waning night,
Caught in a whirlpool, | As dawn-rays tickle our toes, the dew soothes
A quartering act: | Our blistered soles, and damp bones stir
Solitude or society? | As crimson cracks under the blue-grey sky.