diff options
Diffstat (limited to '3rdparty/lua/src/lparser.h')
-rw-r--r-- | 3rdparty/lua/src/lparser.h | 80 |
1 files changed, 59 insertions, 21 deletions
diff --git a/3rdparty/lua/src/lparser.h b/3rdparty/lua/src/lparser.h index 02e9b03aebc..5e4500f181a 100644 --- a/3rdparty/lua/src/lparser.h +++ b/3rdparty/lua/src/lparser.h @@ -1,5 +1,5 @@ /* -** $Id: lparser.h,v 1.76 2015/12/30 18:16:13 roberto Exp $ +** $Id: lparser.h $ ** Lua Parser ** See Copyright Notice in lua.h */ @@ -23,63 +23,96 @@ /* kinds of variables/expressions */ typedef enum { - VVOID, /* when 'expdesc' describes the last expression a list, + VVOID, /* when 'expdesc' describes the last expression of a list, this kind means an empty list (so, no expression) */ VNIL, /* constant nil */ VTRUE, /* constant true */ VFALSE, /* constant false */ VK, /* constant in 'k'; info = index of constant in 'k' */ VKFLT, /* floating constant; nval = numerical float value */ - VKINT, /* integer constant; nval = numerical integer value */ + VKINT, /* integer constant; ival = numerical integer value */ + VKSTR, /* string constant; strval = TString address; + (string is fixed by the lexer) */ VNONRELOC, /* expression has its value in a fixed register; info = result register */ - VLOCAL, /* local variable; info = local register */ + VLOCAL, /* local variable; var.ridx = register index; + var.vidx = relative index in 'actvar.arr' */ VUPVAL, /* upvalue variable; info = index of upvalue in 'upvalues' */ + VCONST, /* compile-time <const> variable; + info = absolute index in 'actvar.arr' */ VINDEXED, /* indexed variable; - ind.vt = whether 't' is register or upvalue; - ind.t = table register or upvalue; - ind.idx = key's R/K index */ + ind.t = table register; + ind.idx = key's R index */ + VINDEXUP, /* indexed upvalue; + ind.t = table upvalue; + ind.idx = key's K index */ + VINDEXI, /* indexed variable with constant integer; + ind.t = table register; + ind.idx = key's value */ + VINDEXSTR, /* indexed variable with literal string; + ind.t = table register; + ind.idx = key's K index */ VJMP, /* expression is a test/comparison; info = pc of corresponding jump instruction */ - VRELOCABLE, /* expression can put result in any register; - info = instruction pc */ + VRELOC, /* expression can put result in any register; + info = instruction pc */ VCALL, /* expression is a function call; info = instruction pc */ VVARARG /* vararg expression; info = instruction pc */ } expkind; -#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) -#define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) +#define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXSTR) +#define vkisindexed(k) (VINDEXED <= (k) && (k) <= VINDEXSTR) + typedef struct expdesc { expkind k; union { lua_Integer ival; /* for VKINT */ lua_Number nval; /* for VKFLT */ + TString *strval; /* for VKSTR */ int info; /* for generic use */ - struct { /* for indexed variables (VINDEXED) */ - short idx; /* index (R/K) */ + struct { /* for indexed variables */ + short idx; /* index (R or "long" K) */ lu_byte t; /* table (register or upvalue) */ - lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ } ind; + struct { /* for local variables */ + lu_byte ridx; /* register holding the variable */ + unsigned short vidx; /* compiler index (in 'actvar.arr') */ + } var; } u; int t; /* patch list of 'exit when true' */ int f; /* patch list of 'exit when false' */ } expdesc; -/* description of active local variable */ -typedef struct Vardesc { - short idx; /* variable index in stack */ +/* kinds of variables */ +#define VDKREG 0 /* regular */ +#define RDKCONST 1 /* constant */ +#define RDKTOCLOSE 2 /* to-be-closed */ +#define RDKCTC 3 /* compile-time constant */ + +/* description of an active local variable */ +typedef union Vardesc { + struct { + TValuefields; /* constant value (if it is a compile-time constant) */ + lu_byte kind; + lu_byte ridx; /* register holding the variable */ + short pidx; /* index of the variable in the Proto's 'locvars' array */ + TString *name; /* variable name */ + } vd; + TValue k; /* constant value (if any) */ } Vardesc; + /* description of pending goto statements and label statements */ typedef struct Labeldesc { TString *name; /* label identifier */ int pc; /* position in code */ int line; /* line where it appeared */ - lu_byte nactvar; /* local level where it appears in current block */ + lu_byte nactvar; /* number of active variables in that position */ + lu_byte close; /* goto that escapes upvalues */ } Labeldesc; @@ -93,7 +126,7 @@ typedef struct Labellist { /* dynamic structures used by the parser */ typedef struct Dyndata { - struct { /* list of active local variables */ + struct { /* list of all active local variables */ Vardesc *arr; int n; int size; @@ -115,17 +148,22 @@ typedef struct FuncState { struct BlockCnt *bl; /* chain of current blocks */ int pc; /* next position to code (equivalent to 'ncode') */ int lasttarget; /* 'label' of last 'jump label' */ - int jpc; /* list of pending jumps to 'pc' */ + int previousline; /* last line that was saved in 'lineinfo' */ int nk; /* number of elements in 'k' */ int np; /* number of elements in 'p' */ + int nabslineinfo; /* number of elements in 'abslineinfo' */ int firstlocal; /* index of first local var (in Dyndata array) */ - short nlocvars; /* number of elements in 'f->locvars' */ + int firstlabel; /* index of first label (in 'dyd->label->arr') */ + short ndebugvars; /* number of elements in 'f->locvars' */ lu_byte nactvar; /* number of active local variables */ lu_byte nups; /* number of upvalues */ lu_byte freereg; /* first free register */ + lu_byte iwthabs; /* instructions issued since last absolute line info */ + lu_byte needclose; /* function needs to close upvalues when returning */ } FuncState; +LUAI_FUNC int luaY_nvarstack (FuncState *fs); LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, Dyndata *dyd, const char *name, int firstchar); |