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Diffstat (limited to 'lib/lua/src/ldebug.c')
-rw-r--r--lib/lua/src/ldebug.c1170
1 files changed, 585 insertions, 585 deletions
diff --git a/lib/lua/src/ldebug.c b/lib/lua/src/ldebug.c
index c78ca4f..0b8e987 100644
--- a/lib/lua/src/ldebug.c
+++ b/lib/lua/src/ldebug.c
@@ -1,585 +1,585 @@
-/*
-** $Id: ldebug.c,v 1.2 2003-12-11 16:53:30 pixel Exp $
-** Debug Interface
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-#include <string.h>
-
-#define ldebug_c
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lvm.h"
-
-
-
-static const char *getfuncname (CallInfo *ci, const char **name);
-
-
-#define isLua(ci) (!((ci)->state & CI_C))
-
-
-static int currentpc (CallInfo *ci) {
- if (!isLua(ci)) return -1; /* function is not a Lua function? */
- if (ci->state & CI_HASFRAME) /* function has a frame? */
- ci->u.l.savedpc = *ci->u.l.pc; /* use `pc' from there */
- /* function's pc is saved */
- return pcRel(ci->u.l.savedpc, ci_func(ci)->l.p);
-}
-
-
-static int currentline (CallInfo *ci) {
- int pc = currentpc(ci);
- if (pc < 0)
- return -1; /* only active lua functions have current-line information */
- else
- return getline(ci_func(ci)->l.p, pc);
-}
-
-
-void luaG_inithooks (lua_State *L) {
- CallInfo *ci;
- for (ci = L->ci; ci != L->base_ci; ci--) /* update all `savedpc's */
- currentpc(ci);
- L->hookinit = 1;
-}
-
-
-/*
-** this function can be called asynchronous (e.g. during a signal)
-*/
-LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
- if (func == NULL || mask == 0) { /* turn off hooks? */
- mask = 0;
- func = NULL;
- }
- L->hook = func;
- L->basehookcount = count;
- resethookcount(L);
- L->hookmask = cast(lu_byte, mask);
- L->hookinit = 0;
- return 1;
-}
-
-
-LUA_API lua_Hook lua_gethook (lua_State *L) {
- return L->hook;
-}
-
-
-LUA_API int lua_gethookmask (lua_State *L) {
- return L->hookmask;
-}
-
-
-LUA_API int lua_gethookcount (lua_State *L) {
- return L->basehookcount;
-}
-
-
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
- int status;
- CallInfo *ci;
- lua_lock(L);
- for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
- level--;
- if (!(ci->state & CI_C)) /* Lua function? */
- level -= ci->u.l.tailcalls; /* skip lost tail calls */
- }
- if (level > 0 || ci == L->base_ci) status = 0; /* there is no such level */
- else if (level < 0) { /* level is of a lost tail call */
- status = 1;
- ar->i_ci = 0;
- }
- else {
- status = 1;
- ar->i_ci = ci - L->base_ci;
- }
- lua_unlock(L);
- return status;
-}
-
-
-static Proto *getluaproto (CallInfo *ci) {
- return (isLua(ci) ? ci_func(ci)->l.p : NULL);
-}
-
-
-LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
- const char *name;
- CallInfo *ci;
- Proto *fp;
- lua_lock(L);
- name = NULL;
- ci = L->base_ci + ar->i_ci;
- fp = getluaproto(ci);
- if (fp) { /* is a Lua function? */
- name = luaF_getlocalname(fp, n, currentpc(ci));
- if (name)
- luaA_pushobject(L, ci->base+(n-1)); /* push value */
- }
- lua_unlock(L);
- return name;
-}
-
-
-LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
- const char *name;
- CallInfo *ci;
- Proto *fp;
- lua_lock(L);
- name = NULL;
- ci = L->base_ci + ar->i_ci;
- fp = getluaproto(ci);
- L->top--; /* pop new value */
- if (fp) { /* is a Lua function? */
- name = luaF_getlocalname(fp, n, currentpc(ci));
- if (!name || name[0] == '(') /* `(' starts private locals */
- name = NULL;
- else
- setobjs2s(ci->base+(n-1), L->top);
- }
- lua_unlock(L);
- return name;
-}
-
-
-static void funcinfo (lua_Debug *ar, StkId func) {
- Closure *cl = clvalue(func);
- if (cl->c.isC) {
- ar->source = "=[C]";
- ar->linedefined = -1;
- ar->what = "C";
- }
- else {
- ar->source = getstr(cl->l.p->source);
- ar->linedefined = cl->l.p->lineDefined;
- ar->what = (ar->linedefined == 0) ? "main" : "Lua";
- }
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
-}
-
-
-static const char *travglobals (lua_State *L, const TObject *o) {
- Table *g = hvalue(gt(L));
- int i = sizenode(g);
- while (i--) {
- Node *n = gnode(g, i);
- if (luaO_rawequalObj(o, gval(n)) && ttisstring(gkey(n)))
- return getstr(tsvalue(gkey(n)));
- }
- return NULL;
-}
-
-
-static void info_tailcall (lua_State *L, lua_Debug *ar) {
- ar->name = ar->namewhat = "";
- ar->what = "tail";
- ar->linedefined = ar->currentline = -1;
- ar->source = "=(tail call)";
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
- ar->nups = 0;
- setnilvalue(L->top);
-}
-
-
-static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
- StkId f, CallInfo *ci) {
- int status = 1;
- for (; *what; what++) {
- switch (*what) {
- case 'S': {
- funcinfo(ar, f);
- break;
- }
- case 'l': {
- ar->currentline = (ci) ? currentline(ci) : -1;
- break;
- }
- case 'u': {
- ar->nups = clvalue(f)->c.nupvalues;
- break;
- }
- case 'n': {
- ar->namewhat = (ci) ? getfuncname(ci, &ar->name) : NULL;
- if (ar->namewhat == NULL) {
- /* try to find a global name */
- if ((ar->name = travglobals(L, f)) != NULL)
- ar->namewhat = "global";
- else ar->namewhat = ""; /* not found */
- }
- break;
- }
- case 'f': {
- setobj2s(L->top, f);
- break;
- }
- default: status = 0; /* invalid option */
- }
- }
- return status;
-}
-
-
-LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
- int status = 1;
- lua_lock(L);
- if (*what == '>') {
- StkId f = L->top - 1;
- if (!ttisfunction(f))
- luaG_runerror(L, "value for `lua_getinfo' is not a function");
- status = auxgetinfo(L, what + 1, ar, f, NULL);
- L->top--; /* pop function */
- }
- else if (ar->i_ci != 0) { /* no tail call? */
- CallInfo *ci = L->base_ci + ar->i_ci;
- lua_assert(ttisfunction(ci->base - 1));
- status = auxgetinfo(L, what, ar, ci->base - 1, ci);
- }
- else
- info_tailcall(L, ar);
- if (strchr(what, 'f')) incr_top(L);
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** {======================================================
-** Symbolic Execution and code checker
-** =======================================================
-*/
-
-#define check(x) if (!(x)) return 0;
-
-#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
-
-#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
-
-
-
-static int precheck (const Proto *pt) {
- check(pt->maxstacksize <= MAXSTACK);
- check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
- lua_assert(pt->numparams+pt->is_vararg <= pt->maxstacksize);
- check(GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
- return 1;
-}
-
-
-static int checkopenop (const Proto *pt, int pc) {
- Instruction i = pt->code[pc+1];
- switch (GET_OPCODE(i)) {
- case OP_CALL:
- case OP_TAILCALL:
- case OP_RETURN: {
- check(GETARG_B(i) == 0);
- return 1;
- }
- case OP_SETLISTO: return 1;
- default: return 0; /* invalid instruction after an open call */
- }
-}
-
-
-static int checkRK (const Proto *pt, int r) {
- return (r < pt->maxstacksize || (r >= MAXSTACK && r-MAXSTACK < pt->sizek));
-}
-
-
-static Instruction luaG_symbexec (const Proto *pt, int lastpc, int reg) {
- int pc;
- int last; /* stores position of last instruction that changed `reg' */
- last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
- check(precheck(pt));
- for (pc = 0; pc < lastpc; pc++) {
- const Instruction i = pt->code[pc];
- OpCode op = GET_OPCODE(i);
- int a = GETARG_A(i);
- int b = 0;
- int c = 0;
- checkreg(pt, a);
- switch (getOpMode(op)) {
- case iABC: {
- b = GETARG_B(i);
- c = GETARG_C(i);
- if (testOpMode(op, OpModeBreg)) {
- checkreg(pt, b);
- }
- else if (testOpMode(op, OpModeBrk))
- check(checkRK(pt, b));
- if (testOpMode(op, OpModeCrk))
- check(checkRK(pt, c));
- break;
- }
- case iABx: {
- b = GETARG_Bx(i);
- if (testOpMode(op, OpModeK)) check(b < pt->sizek);
- break;
- }
- case iAsBx: {
- b = GETARG_sBx(i);
- break;
- }
- }
- if (testOpMode(op, OpModesetA)) {
- if (a == reg) last = pc; /* change register `a' */
- }
- if (testOpMode(op, OpModeT)) {
- check(pc+2 < pt->sizecode); /* check skip */
- check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
- }
- switch (op) {
- case OP_LOADBOOL: {
- check(c == 0 || pc+2 < pt->sizecode); /* check its jump */
- break;
- }
- case OP_LOADNIL: {
- if (a <= reg && reg <= b)
- last = pc; /* set registers from `a' to `b' */
- break;
- }
- case OP_GETUPVAL:
- case OP_SETUPVAL: {
- check(b < pt->nups);
- break;
- }
- case OP_GETGLOBAL:
- case OP_SETGLOBAL: {
- check(ttisstring(&pt->k[b]));
- break;
- }
- case OP_SELF: {
- checkreg(pt, a+1);
- if (reg == a+1) last = pc;
- break;
- }
- case OP_CONCAT: {
- /* `c' is a register, and at least two operands */
- check(c < MAXSTACK && b < c);
- break;
- }
- case OP_TFORLOOP:
- checkreg(pt, a+c+5);
- if (reg >= a) last = pc; /* affect all registers above base */
- /* go through */
- case OP_FORLOOP:
- checkreg(pt, a+2);
- /* go through */
- case OP_JMP: {
- int dest = pc+1+b;
- check(0 <= dest && dest < pt->sizecode);
- /* not full check and jump is forward and do not skip `lastpc'? */
- if (reg != NO_REG && pc < dest && dest <= lastpc)
- pc += b; /* do the jump */
- break;
- }
- case OP_CALL:
- case OP_TAILCALL: {
- if (b != 0) {
- checkreg(pt, a+b-1);
- }
- c--; /* c = num. returns */
- if (c == LUA_MULTRET) {
- check(checkopenop(pt, pc));
- }
- else if (c != 0)
- checkreg(pt, a+c-1);
- if (reg >= a) last = pc; /* affect all registers above base */
- break;
- }
- case OP_RETURN: {
- b--; /* b = num. returns */
- if (b > 0) checkreg(pt, a+b-1);
- break;
- }
- case OP_SETLIST: {
- checkreg(pt, a + (b&(LFIELDS_PER_FLUSH-1)) + 1);
- break;
- }
- case OP_CLOSURE: {
- int nup;
- check(b < pt->sizep);
- nup = pt->p[b]->nups;
- check(pc + nup < pt->sizecode);
- for (; nup>0; nup--) {
- OpCode op1 = GET_OPCODE(pt->code[pc+nup]);
- check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
- }
- break;
- }
- default: break;
- }
- }
- return pt->code[last];
-}
-
-#undef check
-#undef checkjump
-#undef checkreg
-
-/* }====================================================== */
-
-
-int luaG_checkcode (const Proto *pt) {
- return luaG_symbexec(pt, pt->sizecode, NO_REG);
-}
-
-
-static const char *kname (Proto *p, int c) {
- c = c - MAXSTACK;
- if (c >= 0 && ttisstring(&p->k[c]))
- return svalue(&p->k[c]);
- else
- return "?";
-}
-
-
-static const char *getobjname (CallInfo *ci, int stackpos, const char **name) {
- if (isLua(ci)) { /* a Lua function? */
- Proto *p = ci_func(ci)->l.p;
- int pc = currentpc(ci);
- Instruction i;
- *name = luaF_getlocalname(p, stackpos+1, pc);
- if (*name) /* is a local? */
- return "local";
- i = luaG_symbexec(p, pc, stackpos); /* try symbolic execution */
- lua_assert(pc != -1);
- switch (GET_OPCODE(i)) {
- case OP_GETGLOBAL: {
- int g = GETARG_Bx(i); /* global index */
- lua_assert(ttisstring(&p->k[g]));
- *name = svalue(&p->k[g]);
- return "global";
- }
- case OP_MOVE: {
- int a = GETARG_A(i);
- int b = GETARG_B(i); /* move from `b' to `a' */
- if (b < a)
- return getobjname(ci, b, name); /* get name for `b' */
- break;
- }
- case OP_GETTABLE: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "field";
- }
- case OP_SELF: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "method";
- }
- default: break;
- }
- }
- return NULL; /* no useful name found */
-}
-
-
-static const char *getfuncname (CallInfo *ci, const char **name) {
- Instruction i;
- if ((isLua(ci) && ci->u.l.tailcalls > 0) || !isLua(ci - 1))
- return NULL; /* calling function is not Lua (or is unknown) */
- ci--; /* calling function */
- i = ci_func(ci)->l.p->code[currentpc(ci)];
- if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL)
- return getobjname(ci, GETARG_A(i), name);
- else
- return NULL; /* no useful name can be found */
-}
-
-
-/* only ANSI way to check whether a pointer points to an array */
-static int isinstack (CallInfo *ci, const TObject *o) {
- StkId p;
- for (p = ci->base; p < ci->top; p++)
- if (o == p) return 1;
- return 0;
-}
-
-
-void luaG_typeerror (lua_State *L, const TObject *o, const char *op) {
- const char *name = NULL;
- const char *t = luaT_typenames[ttype(o)];
- const char *kind = (isinstack(L->ci, o)) ?
- getobjname(L->ci, o - L->base, &name) : NULL;
- if (kind)
- luaG_runerror(L, "attempt to %s %s `%s' (a %s value)",
- op, kind, name, t);
- else
- luaG_runerror(L, "attempt to %s a %s value", op, t);
-}
-
-
-void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
- if (ttisstring(p1)) p1 = p2;
- lua_assert(!ttisstring(p1));
- luaG_typeerror(L, p1, "concatenate");
-}
-
-
-void luaG_aritherror (lua_State *L, const TObject *p1, const TObject *p2) {
- TObject temp;
- if (luaV_tonumber(p1, &temp) == NULL)
- p2 = p1; /* first operand is wrong */
- luaG_typeerror(L, p2, "perform arithmetic on");
-}
-
-
-int luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) {
- const char *t1 = luaT_typenames[ttype(p1)];
- const char *t2 = luaT_typenames[ttype(p2)];
- if (t1[2] == t2[2])
- luaG_runerror(L, "attempt to compare two %s values", t1);
- else
- luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
- return 0;
-}
-
-
-static void addinfo (lua_State *L, const char *msg) {
- CallInfo *ci = L->ci;
- if (isLua(ci)) { /* is Lua code? */
- char buff[LUA_IDSIZE]; /* add file:line information */
- int line = currentline(ci);
- luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
- luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
- }
-}
-
-
-void luaG_errormsg (lua_State *L) {
- if (L->errfunc != 0) { /* is there an error handling function? */
- StkId errfunc = restorestack(L, L->errfunc);
- if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
- setobjs2s(L->top, L->top - 1); /* move argument */
- setobjs2s(L->top - 1, errfunc); /* push function */
- incr_top(L);
- luaD_call(L, L->top - 2, 1); /* call it */
- }
- luaD_throw(L, LUA_ERRRUN);
-}
-
-
-void luaG_runerror (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- addinfo(L, luaO_pushvfstring(L, fmt, argp));
- va_end(argp);
- luaG_errormsg(L);
-}
-
+/*
+** $Id: ldebug.c,v 1.3 2004-11-27 21:35:20 pixel Exp $
+** Debug Interface
+** See Copyright Notice in lua.h
+*/
+
+
+#include <stdlib.h>
+#include <string.h>
+
+#define ldebug_c
+
+#include "lua.h"
+
+#include "lapi.h"
+#include "lcode.h"
+#include "ldebug.h"
+#include "ldo.h"
+#include "lfunc.h"
+#include "lobject.h"
+#include "lopcodes.h"
+#include "lstate.h"
+#include "lstring.h"
+#include "ltable.h"
+#include "ltm.h"
+#include "lvm.h"
+
+
+
+static const char *getfuncname (CallInfo *ci, const char **name);
+
+
+#define isLua(ci) (!((ci)->state & CI_C))
+
+
+static int currentpc (CallInfo *ci) {
+ if (!isLua(ci)) return -1; /* function is not a Lua function? */
+ if (ci->state & CI_HASFRAME) /* function has a frame? */
+ ci->u.l.savedpc = *ci->u.l.pc; /* use `pc' from there */
+ /* function's pc is saved */
+ return pcRel(ci->u.l.savedpc, ci_func(ci)->l.p);
+}
+
+
+static int currentline (CallInfo *ci) {
+ int pc = currentpc(ci);
+ if (pc < 0)
+ return -1; /* only active lua functions have current-line information */
+ else
+ return getline(ci_func(ci)->l.p, pc);
+}
+
+
+void luaG_inithooks (lua_State *L) {
+ CallInfo *ci;
+ for (ci = L->ci; ci != L->base_ci; ci--) /* update all `savedpc's */
+ currentpc(ci);
+ L->hookinit = 1;
+}
+
+
+/*
+** this function can be called asynchronous (e.g. during a signal)
+*/
+LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
+ if (func == NULL || mask == 0) { /* turn off hooks? */
+ mask = 0;
+ func = NULL;
+ }
+ L->hook = func;
+ L->basehookcount = count;
+ resethookcount(L);
+ L->hookmask = cast(lu_byte, mask);
+ L->hookinit = 0;
+ return 1;
+}
+
+
+LUA_API lua_Hook lua_gethook (lua_State *L) {
+ return L->hook;
+}
+
+
+LUA_API int lua_gethookmask (lua_State *L) {
+ return L->hookmask;
+}
+
+
+LUA_API int lua_gethookcount (lua_State *L) {
+ return L->basehookcount;
+}
+
+
+LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
+ int status;
+ CallInfo *ci;
+ lua_lock(L);
+ for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
+ level--;
+ if (!(ci->state & CI_C)) /* Lua function? */
+ level -= ci->u.l.tailcalls; /* skip lost tail calls */
+ }
+ if (level > 0 || ci == L->base_ci) status = 0; /* there is no such level */
+ else if (level < 0) { /* level is of a lost tail call */
+ status = 1;
+ ar->i_ci = 0;
+ }
+ else {
+ status = 1;
+ ar->i_ci = ci - L->base_ci;
+ }
+ lua_unlock(L);
+ return status;
+}
+
+
+static Proto *getluaproto (CallInfo *ci) {
+ return (isLua(ci) ? ci_func(ci)->l.p : NULL);
+}
+
+
+LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
+ const char *name;
+ CallInfo *ci;
+ Proto *fp;
+ lua_lock(L);
+ name = NULL;
+ ci = L->base_ci + ar->i_ci;
+ fp = getluaproto(ci);
+ if (fp) { /* is a Lua function? */
+ name = luaF_getlocalname(fp, n, currentpc(ci));
+ if (name)
+ luaA_pushobject(L, ci->base+(n-1)); /* push value */
+ }
+ lua_unlock(L);
+ return name;
+}
+
+
+LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
+ const char *name;
+ CallInfo *ci;
+ Proto *fp;
+ lua_lock(L);
+ name = NULL;
+ ci = L->base_ci + ar->i_ci;
+ fp = getluaproto(ci);
+ L->top--; /* pop new value */
+ if (fp) { /* is a Lua function? */
+ name = luaF_getlocalname(fp, n, currentpc(ci));
+ if (!name || name[0] == '(') /* `(' starts private locals */
+ name = NULL;
+ else
+ setobjs2s(ci->base+(n-1), L->top);
+ }
+ lua_unlock(L);
+ return name;
+}
+
+
+static void funcinfo (lua_Debug *ar, StkId func) {
+ Closure *cl = clvalue(func);
+ if (cl->c.isC) {
+ ar->source = "=[C]";
+ ar->linedefined = -1;
+ ar->what = "C";
+ }
+ else {
+ ar->source = getstr(cl->l.p->source);
+ ar->linedefined = cl->l.p->lineDefined;
+ ar->what = (ar->linedefined == 0) ? "main" : "Lua";
+ }
+ luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
+}
+
+
+static const char *travglobals (lua_State *L, const TObject *o) {
+ Table *g = hvalue(gt(L));
+ int i = sizenode(g);
+ while (i--) {
+ Node *n = gnode(g, i);
+ if (luaO_rawequalObj(o, gval(n)) && ttisstring(gkey(n)))
+ return getstr(tsvalue(gkey(n)));
+ }
+ return NULL;
+}
+
+
+static void info_tailcall (lua_State *L, lua_Debug *ar) {
+ ar->name = ar->namewhat = "";
+ ar->what = "tail";
+ ar->linedefined = ar->currentline = -1;
+ ar->source = "=(tail call)";
+ luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
+ ar->nups = 0;
+ setnilvalue(L->top);
+}
+
+
+static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
+ StkId f, CallInfo *ci) {
+ int status = 1;
+ for (; *what; what++) {
+ switch (*what) {
+ case 'S': {
+ funcinfo(ar, f);
+ break;
+ }
+ case 'l': {
+ ar->currentline = (ci) ? currentline(ci) : -1;
+ break;
+ }
+ case 'u': {
+ ar->nups = clvalue(f)->c.nupvalues;
+ break;
+ }
+ case 'n': {
+ ar->namewhat = (ci) ? getfuncname(ci, &ar->name) : NULL;
+ if (ar->namewhat == NULL) {
+ /* try to find a global name */
+ if ((ar->name = travglobals(L, f)) != NULL)
+ ar->namewhat = "global";
+ else ar->namewhat = ""; /* not found */
+ }
+ break;
+ }
+ case 'f': {
+ setobj2s(L->top, f);
+ break;
+ }
+ default: status = 0; /* invalid option */
+ }
+ }
+ return status;
+}
+
+
+LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
+ int status = 1;
+ lua_lock(L);
+ if (*what == '>') {
+ StkId f = L->top - 1;
+ if (!ttisfunction(f))
+ luaG_runerror(L, "value for `lua_getinfo' is not a function");
+ status = auxgetinfo(L, what + 1, ar, f, NULL);
+ L->top--; /* pop function */
+ }
+ else if (ar->i_ci != 0) { /* no tail call? */
+ CallInfo *ci = L->base_ci + ar->i_ci;
+ lua_assert(ttisfunction(ci->base - 1));
+ status = auxgetinfo(L, what, ar, ci->base - 1, ci);
+ }
+ else
+ info_tailcall(L, ar);
+ if (strchr(what, 'f')) incr_top(L);
+ lua_unlock(L);
+ return status;
+}
+
+
+/*
+** {======================================================
+** Symbolic Execution and code checker
+** =======================================================
+*/
+
+#define check(x) if (!(x)) return 0;
+
+#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
+
+#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
+
+
+
+static int precheck (const Proto *pt) {
+ check(pt->maxstacksize <= MAXSTACK);
+ check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
+ lua_assert(pt->numparams+pt->is_vararg <= pt->maxstacksize);
+ check(GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
+ return 1;
+}
+
+
+static int checkopenop (const Proto *pt, int pc) {
+ Instruction i = pt->code[pc+1];
+ switch (GET_OPCODE(i)) {
+ case OP_CALL:
+ case OP_TAILCALL:
+ case OP_RETURN: {
+ check(GETARG_B(i) == 0);
+ return 1;
+ }
+ case OP_SETLISTO: return 1;
+ default: return 0; /* invalid instruction after an open call */
+ }
+}
+
+
+static int checkRK (const Proto *pt, int r) {
+ return (r < pt->maxstacksize || (r >= MAXSTACK && r-MAXSTACK < pt->sizek));
+}
+
+
+static Instruction luaG_symbexec (const Proto *pt, int lastpc, int reg) {
+ int pc;
+ int last; /* stores position of last instruction that changed `reg' */
+ last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
+ check(precheck(pt));
+ for (pc = 0; pc < lastpc; pc++) {
+ const Instruction i = pt->code[pc];
+ OpCode op = GET_OPCODE(i);
+ int a = GETARG_A(i);
+ int b = 0;
+ int c = 0;
+ checkreg(pt, a);
+ switch (getOpMode(op)) {
+ case iABC: {
+ b = GETARG_B(i);
+ c = GETARG_C(i);
+ if (testOpMode(op, OpModeBreg)) {
+ checkreg(pt, b);
+ }
+ else if (testOpMode(op, OpModeBrk))
+ check(checkRK(pt, b));
+ if (testOpMode(op, OpModeCrk))
+ check(checkRK(pt, c));
+ break;
+ }
+ case iABx: {
+ b = GETARG_Bx(i);
+ if (testOpMode(op, OpModeK)) check(b < pt->sizek);
+ break;
+ }
+ case iAsBx: {
+ b = GETARG_sBx(i);
+ break;
+ }
+ }
+ if (testOpMode(op, OpModesetA)) {
+ if (a == reg) last = pc; /* change register `a' */
+ }
+ if (testOpMode(op, OpModeT)) {
+ check(pc+2 < pt->sizecode); /* check skip */
+ check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
+ }
+ switch (op) {
+ case OP_LOADBOOL: {
+ check(c == 0 || pc+2 < pt->sizecode); /* check its jump */
+ break;
+ }
+ case OP_LOADNIL: {
+ if (a <= reg && reg <= b)
+ last = pc; /* set registers from `a' to `b' */
+ break;
+ }
+ case OP_GETUPVAL:
+ case OP_SETUPVAL: {
+ check(b < pt->nups);
+ break;
+ }
+ case OP_GETGLOBAL:
+ case OP_SETGLOBAL: {
+ check(ttisstring(&pt->k[b]));
+ break;
+ }
+ case OP_SELF: {
+ checkreg(pt, a+1);
+ if (reg == a+1) last = pc;
+ break;
+ }
+ case OP_CONCAT: {
+ /* `c' is a register, and at least two operands */
+ check(c < MAXSTACK && b < c);
+ break;
+ }
+ case OP_TFORLOOP:
+ checkreg(pt, a+c+5);
+ if (reg >= a) last = pc; /* affect all registers above base */
+ /* go through */
+ case OP_FORLOOP:
+ checkreg(pt, a+2);
+ /* go through */
+ case OP_JMP: {
+ int dest = pc+1+b;
+ check(0 <= dest && dest < pt->sizecode);
+ /* not full check and jump is forward and do not skip `lastpc'? */
+ if (reg != NO_REG && pc < dest && dest <= lastpc)
+ pc += b; /* do the jump */
+ break;
+ }
+ case OP_CALL:
+ case OP_TAILCALL: {
+ if (b != 0) {
+ checkreg(pt, a+b-1);
+ }
+ c--; /* c = num. returns */
+ if (c == LUA_MULTRET) {
+ check(checkopenop(pt, pc));
+ }
+ else if (c != 0)
+ checkreg(pt, a+c-1);
+ if (reg >= a) last = pc; /* affect all registers above base */
+ break;
+ }
+ case OP_RETURN: {
+ b--; /* b = num. returns */
+ if (b > 0) checkreg(pt, a+b-1);
+ break;
+ }
+ case OP_SETLIST: {
+ checkreg(pt, a + (b&(LFIELDS_PER_FLUSH-1)) + 1);
+ break;
+ }
+ case OP_CLOSURE: {
+ int nup;
+ check(b < pt->sizep);
+ nup = pt->p[b]->nups;
+ check(pc + nup < pt->sizecode);
+ for (; nup>0; nup--) {
+ OpCode op1 = GET_OPCODE(pt->code[pc+nup]);
+ check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
+ }
+ break;
+ }
+ default: break;
+ }
+ }
+ return pt->code[last];
+}
+
+#undef check
+#undef checkjump
+#undef checkreg
+
+/* }====================================================== */
+
+
+int luaG_checkcode (const Proto *pt) {
+ return luaG_symbexec(pt, pt->sizecode, NO_REG);
+}
+
+
+static const char *kname (Proto *p, int c) {
+ c = c - MAXSTACK;
+ if (c >= 0 && ttisstring(&p->k[c]))
+ return svalue(&p->k[c]);
+ else
+ return "?";
+}
+
+
+static const char *getobjname (CallInfo *ci, int stackpos, const char **name) {
+ if (isLua(ci)) { /* a Lua function? */
+ Proto *p = ci_func(ci)->l.p;
+ int pc = currentpc(ci);
+ Instruction i;
+ *name = luaF_getlocalname(p, stackpos+1, pc);
+ if (*name) /* is a local? */
+ return "local";
+ i = luaG_symbexec(p, pc, stackpos); /* try symbolic execution */
+ lua_assert(pc != -1);
+ switch (GET_OPCODE(i)) {
+ case OP_GETGLOBAL: {
+ int g = GETARG_Bx(i); /* global index */
+ lua_assert(ttisstring(&p->k[g]));
+ *name = svalue(&p->k[g]);
+ return "global";
+ }
+ case OP_MOVE: {
+ int a = GETARG_A(i);
+ int b = GETARG_B(i); /* move from `b' to `a' */
+ if (b < a)
+ return getobjname(ci, b, name); /* get name for `b' */
+ break;
+ }
+ case OP_GETTABLE: {
+ int k = GETARG_C(i); /* key index */
+ *name = kname(p, k);
+ return "field";
+ }
+ case OP_SELF: {
+ int k = GETARG_C(i); /* key index */
+ *name = kname(p, k);
+ return "method";
+ }
+ default: break;
+ }
+ }
+ return NULL; /* no useful name found */
+}
+
+
+static const char *getfuncname (CallInfo *ci, const char **name) {
+ Instruction i;
+ if ((isLua(ci) && ci->u.l.tailcalls > 0) || !isLua(ci - 1))
+ return NULL; /* calling function is not Lua (or is unknown) */
+ ci--; /* calling function */
+ i = ci_func(ci)->l.p->code[currentpc(ci)];
+ if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL)
+ return getobjname(ci, GETARG_A(i), name);
+ else
+ return NULL; /* no useful name can be found */
+}
+
+
+/* only ANSI way to check whether a pointer points to an array */
+static int isinstack (CallInfo *ci, const TObject *o) {
+ StkId p;
+ for (p = ci->base; p < ci->top; p++)
+ if (o == p) return 1;
+ return 0;
+}
+
+
+void luaG_typeerror (lua_State *L, const TObject *o, const char *op) {
+ const char *name = NULL;
+ const char *t = luaT_typenames[ttype(o)];
+ const char *kind = (isinstack(L->ci, o)) ?
+ getobjname(L->ci, o - L->base, &name) : NULL;
+ if (kind)
+ luaG_runerror(L, "attempt to %s %s `%s' (a %s value)",
+ op, kind, name, t);
+ else
+ luaG_runerror(L, "attempt to %s a %s value", op, t);
+}
+
+
+void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
+ if (ttisstring(p1)) p1 = p2;
+ lua_assert(!ttisstring(p1));
+ luaG_typeerror(L, p1, "concatenate");
+}
+
+
+void luaG_aritherror (lua_State *L, const TObject *p1, const TObject *p2) {
+ TObject temp;
+ if (luaV_tonumber(p1, &temp) == NULL)
+ p2 = p1; /* first operand is wrong */
+ luaG_typeerror(L, p2, "perform arithmetic on");
+}
+
+
+int luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) {
+ const char *t1 = luaT_typenames[ttype(p1)];
+ const char *t2 = luaT_typenames[ttype(p2)];
+ if (t1[2] == t2[2])
+ luaG_runerror(L, "attempt to compare two %s values", t1);
+ else
+ luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
+ return 0;
+}
+
+
+static void addinfo (lua_State *L, const char *msg) {
+ CallInfo *ci = L->ci;
+ if (isLua(ci)) { /* is Lua code? */
+ char buff[LUA_IDSIZE]; /* add file:line information */
+ int line = currentline(ci);
+ luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
+ luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
+ }
+}
+
+
+void luaG_errormsg (lua_State *L) {
+ if (L->errfunc != 0) { /* is there an error handling function? */
+ StkId errfunc = restorestack(L, L->errfunc);
+ if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
+ setobjs2s(L->top, L->top - 1); /* move argument */
+ setobjs2s(L->top - 1, errfunc); /* push function */
+ incr_top(L);
+ luaD_call(L, L->top - 2, 1); /* call it */
+ }
+ luaD_throw(L, LUA_ERRRUN);
+}
+
+
+void luaG_runerror (lua_State *L, const char *fmt, ...) {
+ va_list argp;
+ va_start(argp, fmt);
+ addinfo(L, luaO_pushvfstring(L, fmt, argp));
+ va_end(argp);
+ luaG_errormsg(L);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-11 22:39:24 +0000