diff options
Diffstat (limited to 'lib/lua/includes/lstate.h')
| -rw-r--r-- | lib/lua/includes/lstate.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/lib/lua/includes/lstate.h b/lib/lua/includes/lstate.h new file mode 100644 index 0000000..dd2e299 --- /dev/null +++ b/lib/lua/includes/lstate.h @@ -0,0 +1,195 @@ +/*
+** $Id: lstate.h,v 1.1 2003-11-06 11:56:07 pixel Exp $
+** Global State
+** See Copyright Notice in lua.h
+*/
+
+#ifndef lstate_h
+#define lstate_h
+
+#include "lua.h"
+
+#include "lobject.h"
+#include "ltm.h"
+#include "lzio.h"
+
+
+/*
+** macros for thread synchronization inside Lua core machine:
+** all accesses to the global state and to global objects are synchronized.
+** Because threads can read the stack of other threads
+** (when running garbage collection),
+** a thread must also synchronize any write-access to its own stack.
+** Unsynchronized accesses are allowed only when reading its own stack,
+** or when reading immutable fields from global objects
+** (such as string values and udata values).
+*/
+#ifndef lua_lock
+#define lua_lock(L) ((void) 0)
+#endif
+
+#ifndef lua_unlock
+#define lua_unlock(L) ((void) 0)
+#endif
+
+
+#ifndef lua_userstateopen
+#define lua_userstateopen(l)
+#endif
+
+
+
+struct lua_longjmp; /* defined in ldo.c */
+
+
+/* default meta table (both for tables and udata) */
+#define defaultmeta(L) (&G(L)->_defaultmeta)
+
+/* table of globals */
+#define gt(L) (&L->_gt)
+
+/* registry */
+#define registry(L) (&G(L)->_registry)
+
+
+/* extra stack space to handle TM calls and some other extras */
+#define EXTRA_STACK 5
+
+
+#define BASIC_CI_SIZE 8
+
+#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
+
+
+
+typedef struct stringtable {
+ GCObject **hash;
+ ls_nstr nuse; /* number of elements */
+ int size;
+} stringtable;
+
+
+/*
+** informations about a call
+*/
+typedef struct CallInfo {
+ StkId base; /* base for called function */
+ StkId top; /* top for this function */
+ int state; /* bit fields; see below */
+ union {
+ struct { /* for Lua functions */
+ const Instruction *savedpc;
+ const Instruction **pc; /* points to `pc' variable in `luaV_execute' */
+ int tailcalls; /* number of tail calls lost under this entry */
+ } l;
+ struct { /* for C functions */
+ int dummy; /* just to avoid an empty struct */
+ } c;
+ } u;
+} CallInfo;
+
+
+/*
+** bit fields for `CallInfo.state'
+*/
+#define CI_C (1<<0) /* 1 if function is a C function */
+/* 1 if (Lua) function has an active `luaV_execute' running it */
+#define CI_HASFRAME (1<<1)
+/* 1 if Lua function is calling another Lua function (and therefore its
+ `pc' is being used by the other, and therefore CI_SAVEDPC is 1 too) */
+#define CI_CALLING (1<<2)
+#define CI_SAVEDPC (1<<3) /* 1 if `savedpc' is updated */
+#define CI_YIELD (1<<4) /* 1 if thread is suspended */
+
+
+#define ci_func(ci) (clvalue((ci)->base - 1))
+
+
+/*
+** `global state', shared by all threads of this state
+*/
+typedef struct global_State {
+ stringtable strt; /* hash table for strings */
+ GCObject *rootgc; /* list of (almost) all collectable objects */
+ GCObject *rootudata; /* (separated) list of all userdata */
+ GCObject *tmudata; /* list of userdata to be GC */
+ Mbuffer buff; /* temporary buffer for string concatentation */
+ lu_mem GCthreshold;
+ lu_mem nblocks; /* number of `bytes' currently allocated */
+ lua_CFunction panic; /* to be called in unprotected errors */
+ TObject _registry;
+ TObject _defaultmeta;
+ struct lua_State *mainthread;
+ Node dummynode[1]; /* common node array for all empty tables */
+ TString *tmname[TM_N]; /* array with tag-method names */
+} global_State;
+
+
+/*
+** `per thread' state
+*/
+struct lua_State {
+ CommonHeader;
+ StkId top; /* first free slot in the stack */
+ StkId base; /* base of current function */
+ global_State *l_G;
+ CallInfo *ci; /* call info for current function */
+ StkId stack_last; /* last free slot in the stack */
+ StkId stack; /* stack base */
+ int stacksize;
+ CallInfo *end_ci; /* points after end of ci array*/
+ CallInfo *base_ci; /* array of CallInfo's */
+ unsigned short size_ci; /* size of array `base_ci' */
+ unsigned short nCcalls; /* number of nested C calls */
+ lu_byte hookmask;
+ lu_byte allowhook;
+ lu_byte hookinit;
+ int basehookcount;
+ int hookcount;
+ lua_Hook hook;
+ TObject _gt; /* table of globals */
+ GCObject *openupval; /* list of open upvalues in this stack */
+ GCObject *gclist;
+ struct lua_longjmp *errorJmp; /* current error recover point */
+ ptrdiff_t errfunc; /* current error handling function (stack index) */
+};
+
+
+#define G(L) (L->l_G)
+
+
+/*
+** Union of all collectable objects
+*/
+union GCObject {
+ GCheader gch;
+ union TString ts;
+ union Udata u;
+ union Closure cl;
+ struct Table h;
+ struct Proto p;
+ struct UpVal uv;
+ struct lua_State th; /* thread */
+};
+
+
+/* macros to convert a GCObject into a specific value */
+#define gcotots(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
+#define gcotou(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
+#define gcotocl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
+#define gcotoh(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
+#define gcotop(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
+#define gcotouv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
+#define ngcotouv(o) \
+ check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
+#define gcototh(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
+
+/* macro to convert any value into a GCObject */
+#define valtogco(v) (cast(GCObject *, (v)))
+
+
+lua_State *luaE_newthread (lua_State *L);
+void luaE_freethread (lua_State *L, lua_State *L1);
+
+#endif
+
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