272 lines
9.3 KiB
C
272 lines
9.3 KiB
C
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/*
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** $Id: lstate.h,v 2.133.1.1 2017/04/19 17:39:34 roberto Exp $
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** Global State
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** See Copyright Notice in lua.h
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*/
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#ifndef lstate_h
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#define lstate_h
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#include "lua.h"
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#include "lobject.h"
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#include "ltm.h"
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#include "lzio.h"
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/*
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** Some notes about garbage-collected objects: All objects in Lua must
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** be kept somehow accessible until being freed, so all objects always
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** belong to one (and only one) of these lists, using field 'next' of
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** the 'CommonHeader' for the link:
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**
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** 'allgc': all objects not marked for finalization;
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** 'finobj': all objects marked for finalization;
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** 'tobefnz': all objects ready to be finalized;
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** 'fixedgc': all objects that are not to be collected (currently
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** only small strings, such as reserved words).
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**
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** Moreover, there is another set of lists that control gray objects.
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** These lists are linked by fields 'gclist'. (All objects that
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** can become gray have such a field. The field is not the same
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** in all objects, but it always has this name.) Any gray object
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** must belong to one of these lists, and all objects in these lists
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** must be gray:
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**
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** 'gray': regular gray objects, still waiting to be visited.
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** 'grayagain': objects that must be revisited at the atomic phase.
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** That includes
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** - black objects got in a write barrier;
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** - all kinds of weak tables during propagation phase;
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** - all threads.
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** 'weak': tables with weak values to be cleared;
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** 'ephemeron': ephemeron tables with white->white entries;
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** 'allweak': tables with weak keys and/or weak values to be cleared.
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** The last three lists are used only during the atomic phase.
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*/
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struct lua_longjmp; /* defined in ldo.c */
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/*
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** Atomic type (relative to signals) to better ensure that 'lua_sethook'
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** is thread safe
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*/
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#ifdef LUA_USE_ESP8266
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# define l_define l_signal_t size_t
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#endif
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#if !defined(l_signalT)
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#include <signal.h>
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#define l_signalT sig_atomic_t
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#endif
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/* extra stack space to handle TM calls and some other extras */
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#define EXTRA_STACK 5
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#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
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/* kinds of Garbage Collection */
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#define KGC_NORMAL 0
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#define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */
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typedef struct stringtable {
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TString **hash;
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int nuse; /* number of elements */
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int size;
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} stringtable;
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/*
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** Information about a call.
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** When a thread yields, 'func' is adjusted to pretend that the
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** top function has only the yielded values in its stack; in that
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** case, the actual 'func' value is saved in field 'extra'.
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** When a function calls another with a continuation, 'extra' keeps
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** the function index so that, in case of errors, the continuation
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** function can be called with the correct top.
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*/
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typedef struct CallInfo {
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StkId func; /* function index in the stack */
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StkId top; /* top for this function */
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struct CallInfo *previous, *next; /* dynamic call link */
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union {
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struct { /* only for Lua functions */
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StkId base; /* base for this function */
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const Instruction *savedpc;
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} l;
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struct { /* only for C functions */
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lua_KFunction k; /* continuation in case of yields */
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ptrdiff_t old_errfunc;
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lua_KContext ctx; /* context info. in case of yields */
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} c;
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} u;
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ptrdiff_t extra;
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short nresults; /* expected number of results from this function */
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unsigned short callstatus;
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} CallInfo;
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/*
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** Bits in CallInfo status
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*/
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#define CIST_OAH (1<<0) /* original value of 'allowhook' */
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#define CIST_LUA (1<<1) /* call is running a Lua function */
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#define CIST_HOOKED (1<<2) /* call is running a debug hook */
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#define CIST_FRESH (1<<3) /* call is running on a fresh invocation
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of luaV_execute */
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#define CIST_YPCALL (1<<4) /* call is a yieldable protected call */
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#define CIST_TAIL (1<<5) /* call was tail called */
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#define CIST_HOOKYIELD (1<<6) /* last hook called yielded */
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#define CIST_LEQ (1<<7) /* using __lt for __le */
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#define CIST_FIN (1<<8) /* call is running a finalizer */
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#define isLua(ci) ((ci)->callstatus & CIST_LUA)
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/* assume that CIST_OAH has offset 0 and that 'v' is strictly 0/1 */
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#define setoah(st,v) ((st) = ((st) & ~CIST_OAH) | (v))
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#define getoah(st) ((st) & CIST_OAH)
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/*
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** KeyCache used for resolution of ROTable entries and Cstrings
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*/
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typedef size_t KeyCache;
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typedef KeyCache KeyCacheLine[KEYCACHE_M];
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/*
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** 'global state', shared by all threads of this state
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*/
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typedef struct FlashHeader LFSHeader;
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typedef struct global_State {
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lua_Alloc frealloc; /* function to reallocate memory */
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void *ud; /* auxiliary data to 'frealloc' */
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l_mem totalbytes; /* number of bytes currently allocated - GCdebt */
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l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
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lu_mem GCmemtrav; /* memory traversed by the GC */
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lu_mem GCestimate; /* an estimate of the non-garbage memory in use */
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stringtable strt; /* hash table for strings */
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TValue l_registry;
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unsigned int seed; /* randomized seed for hashes */
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lu_byte currentwhite;
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lu_byte gcstate; /* state of garbage collector */
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lu_byte gckind; /* kind of GC running */
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lu_byte gcrunning; /* true if GC is running */
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GCObject *allgc; /* list of all collectable objects */
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GCObject **sweepgc; /* current position of sweep in list */
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GCObject *finobj; /* list of collectable objects with finalizers */
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GCObject *gray; /* list of gray objects */
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GCObject *grayagain; /* list of objects to be traversed atomically */
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GCObject *weak; /* list of tables with weak values */
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GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
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GCObject *allweak; /* list of all-weak tables */
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GCObject *tobefnz; /* list of userdata to be GC */
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GCObject *fixedgc; /* list of objects not to be collected */
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struct lua_State *twups; /* list of threads with open upvalues */
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unsigned int gcfinnum; /* number of finalizers to call in each GC step */
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int gcpause; /* size of pause between successive GCs */
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int gcstepmul; /* GC 'granularity' */
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int stripdefault; /* default stripping level for compilation */
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l_mem gcmemfreeboard; /* Free board which triggers EGC */
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lua_CFunction panic; /* to be called in unprotected errors */
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struct lua_State *mainthread;
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const lua_Number *version; /* pointer to version number */
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TString *memerrmsg; /* memory-error message */
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TString *tmname[TM_N]; /* array with tag-method names */
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struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */
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stringtable ROstrt; /* Flash-based hash table for RO strings */
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TValue LFStable; /* Flash-based Proto main */
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LFSHeader *l_LFS; /* Lua Flash Store header */
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unsigned int LFSsize; /* size of LFS partition */
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KeyCacheLine *cache; /* cache for strings in API */
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} global_State;
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/*
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** 'per thread' state
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*/
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struct lua_State {
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CommonHeader;
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unsigned short nci; /* number of items in 'ci' list */
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lu_byte status;
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StkId top; /* first free slot in the stack */
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global_State *l_G;
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CallInfo *ci; /* call info for current function */
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const Instruction *oldpc; /* last pc traced */
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StkId stack_last; /* last free slot in the stack */
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StkId stack; /* stack base */
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UpVal *openupval; /* list of open upvalues in this stack */
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GCObject *gclist;
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struct lua_State *twups; /* list of threads with open upvalues */
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struct lua_longjmp *errorJmp; /* current error recover point */
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CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
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volatile lua_Hook hook;
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ptrdiff_t errfunc; /* current error handling function (stack index) */
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int stacksize;
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int basehookcount;
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int hookcount;
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unsigned short nny; /* number of non-yieldable calls in stack */
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unsigned short nCcalls; /* number of nested C calls */
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l_signalT hookmask;
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lu_byte allowhook;
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};
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#define G(L) (L->l_G)
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/*
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** Union of all collectable objects (only for conversions)
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*/
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union GCUnion {
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GCObject gc; /* common header */
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struct TString ts;
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struct Udata u;
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union Closure cl;
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struct Table h;
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struct ROTable roh;
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struct Proto p;
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struct lua_State th; /* thread */
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};
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#define cast_u(o) cast(union GCUnion *, (o))
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/* macros to convert a GCObject into a specific value */
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#define gco2ts(o) \
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check_exp(novariant((gettt(o))) == LUA_TSTRING, &((cast_u(o))->ts))
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#define gco2u(o) check_exp((gettt(o)) == LUA_TUSERDATA, &((cast_u(o))->u))
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#define gco2lcl(o) check_exp((gettt(o)) == LUA_TLCL, &((cast_u(o))->cl.l))
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#define gco2ccl(o) check_exp((gettt(o)) == LUA_TCCL, &((cast_u(o))->cl.c))
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#define gco2cl(o) \
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check_exp(novariant((gettt(o))) == LUA_TFUNCTION, &((cast_u(o))->cl))
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#define gco2t(o) \
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check_exp(novariant((gettt(o))) == LUA_TTABLE, &((cast_u(o))->h))
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#define gco2rwt(o) check_exp((gettt(o)) == LUA_TTBLRAM, &((cast_u(o))->h))
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#define gco2rot(o) check_exp((gettt(o)) == LUA_TTBLROF, &((cast_u(o))->roh))
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#define gco2p(o) check_exp((gettt(o)) == LUA_TPROTO, &((cast_u(o))->p))
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#define gco2th(o) check_exp((gettt(o)) == LUA_TTHREAD, &((cast_u(o))->th))
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/* macro to convert a Lua object into a GCObject */
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#define obj2gco(v) \
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check_exp(novariant((v)->tt) < LUA_TDEADKEY, (&(cast_u(v)->gc)))
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/* actual number of total bytes allocated */
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#define gettotalbytes(g) cast(lu_mem, (g)->totalbytes + (g)->GCdebt)
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LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
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LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
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LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
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LUAI_FUNC void luaE_freeCI (lua_State *L);
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LUAI_FUNC void luaE_shrinkCI (lua_State *L);
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LUAI_FUNC KeyCache *luaE_getcache (int cl);
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#endif
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