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- /*
- ** $Id: ldebug.c $
- ** Debug Interface
- ** See Copyright Notice in lua.h
- */
- #define ldebug_c
- #define LUA_CORE
- #include "lprefix.h"
- #include <stdarg.h>
- #include <stddef.h>
- #include <string.h>
- #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"
- #define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_VCCL)
- /* inverse of 'pcRel' */
- #define invpcRel(pc, p) ((p)->code + (pc) + 1)
- static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
- const char **name);
- static int currentpc (CallInfo *ci) {
- lua_assert(isLua(ci));
- return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
- }
- /*
- ** Get a "base line" to find the line corresponding to an instruction.
- ** For that, search the array of absolute line info for the largest saved
- ** instruction smaller or equal to the wanted instruction. A special
- ** case is when there is no absolute info or the instruction is before
- ** the first absolute one.
- */
- static int getbaseline (const Proto *f, int pc, int *basepc) {
- if (f->sizeabslineinfo == 0 || pc < f->abslineinfo[0].pc) {
- *basepc = -1; /* start from the beginning */
- return f->linedefined;
- }
- else {
- unsigned int i;
- if (pc >= f->abslineinfo[f->sizeabslineinfo - 1].pc)
- i = f->sizeabslineinfo - 1; /* instruction is after last saved one */
- else { /* binary search */
- unsigned int j = f->sizeabslineinfo - 1; /* pc < anchorlines[j] */
- i = 0; /* abslineinfo[i] <= pc */
- while (i < j - 1) {
- unsigned int m = (j + i) / 2;
- if (pc >= f->abslineinfo[m].pc)
- i = m;
- else
- j = m;
- }
- }
- *basepc = f->abslineinfo[i].pc;
- return f->abslineinfo[i].line;
- }
- }
- /*
- ** Get the line corresponding to instruction 'pc' in function 'f';
- ** first gets a base line and from there does the increments until
- ** the desired instruction.
- */
- int luaG_getfuncline (const Proto *f, int pc) {
- if (f->lineinfo == NULL) /* no debug information? */
- return -1;
- else {
- int basepc;
- int baseline = getbaseline(f, pc, &basepc);
- while (basepc++ < pc) { /* walk until given instruction */
- lua_assert(f->lineinfo[basepc] != ABSLINEINFO);
- baseline += f->lineinfo[basepc]; /* correct line */
- }
- return baseline;
- }
- }
- static int getcurrentline (CallInfo *ci) {
- return luaG_getfuncline(ci_func(ci)->p, currentpc(ci));
- }
- /*
- ** Set 'trap' for all active Lua frames.
- ** This function can be called during a signal, under "reasonable"
- ** assumptions. A new 'ci' is completely linked in the list before it
- ** becomes part of the "active" list, and we assume that pointers are
- ** atomic; see comment in next function.
- ** (A compiler doing interprocedural optimizations could, theoretically,
- ** reorder memory writes in such a way that the list could be
- ** temporarily broken while inserting a new element. We simply assume it
- ** has no good reasons to do that.)
- */
- static void settraps (CallInfo *ci) {
- for (; ci != NULL; ci = ci->previous)
- if (isLua(ci))
- ci->u.l.trap = 1;
- }
- /*
- ** This function can be called during a signal, under "reasonable"
- ** assumptions.
- ** Fields 'basehookcount' and 'hookcount' (set by 'resethookcount')
- ** are for debug only, and it is no problem if they get arbitrary
- ** values (causes at most one wrong hook call). 'hookmask' is an atomic
- ** value. We assume that pointers are atomic too (e.g., gcc ensures that
- ** for all platforms where it runs). Moreover, 'hook' is always checked
- ** before being called (see 'luaD_hook').
- */
- LUA_API void 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_byte(mask);
- if (mask)
- settraps(L->ci); /* to trace inside 'luaV_execute' */
- }
- 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;
- if (level < 0) return 0; /* invalid (negative) level */
- lua_lock(L);
- for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
- level--;
- if (level == 0 && ci != &L->base_ci) { /* level found? */
- status = 1;
- ar->i_ci = ci;
- }
- else status = 0; /* no such level */
- lua_unlock(L);
- return status;
- }
- static const char *upvalname (const Proto *p, int uv) {
- TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
- if (s == NULL) return "?";
- else return getstr(s);
- }
- static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
- if (clLvalue(s2v(ci->func))->p->is_vararg) {
- int nextra = ci->u.l.nextraargs;
- if (n >= -nextra) { /* 'n' is negative */
- *pos = ci->func - nextra - (n + 1);
- return "(vararg)"; /* generic name for any vararg */
- }
- }
- return NULL; /* no such vararg */
- }
- const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, StkId *pos) {
- StkId base = ci->func + 1;
- const char *name = NULL;
- if (isLua(ci)) {
- if (n < 0) /* access to vararg values? */
- return findvararg(ci, n, pos);
- else
- name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
- }
- if (name == NULL) { /* no 'standard' name? */
- StkId limit = (ci == L->ci) ? L->top : ci->next->func;
- if (limit - base >= n && n > 0) { /* is 'n' inside 'ci' stack? */
- /* generic name for any valid slot */
- name = isLua(ci) ? "(temporary)" : "(C temporary)";
- }
- else
- return NULL; /* no name */
- }
- if (pos)
- *pos = base + (n - 1);
- return name;
- }
- LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
- const char *name;
- lua_lock(L);
- if (ar == NULL) { /* information about non-active function? */
- if (!isLfunction(s2v(L->top - 1))) /* not a Lua function? */
- name = NULL;
- else /* consider live variables at function start (parameters) */
- name = luaF_getlocalname(clLvalue(s2v(L->top - 1))->p, n, 0);
- }
- else { /* active function; get information through 'ar' */
- StkId pos = NULL; /* to avoid warnings */
- name = luaG_findlocal(L, ar->i_ci, n, &pos);
- if (name) {
- setobjs2s(L, L->top, pos);
- api_incr_top(L);
- }
- }
- lua_unlock(L);
- return name;
- }
- LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
- StkId pos = NULL; /* to avoid warnings */
- const char *name;
- lua_lock(L);
- name = luaG_findlocal(L, ar->i_ci, n, &pos);
- if (name) {
- setobjs2s(L, pos, L->top - 1);
- L->top--; /* pop value */
- }
- lua_unlock(L);
- return name;
- }
- static void funcinfo (lua_Debug *ar, Closure *cl) {
- if (noLuaClosure(cl)) {
- ar->source = "=[C]";
- ar->srclen = LL("=[C]");
- ar->linedefined = -1;
- ar->lastlinedefined = -1;
- ar->what = "C";
- }
- else {
- const Proto *p = cl->l.p;
- if (p->source) {
- ar->source = getstr(p->source);
- ar->srclen = tsslen(p->source);
- }
- else {
- ar->source = "=?";
- ar->srclen = LL("=?");
- }
- ar->linedefined = p->linedefined;
- ar->lastlinedefined = p->lastlinedefined;
- ar->what = (ar->linedefined == 0) ? "main" : "Lua";
- }
- luaO_chunkid(ar->short_src, ar->source, ar->srclen);
- }
- static int nextline (const Proto *p, int currentline, int pc) {
- if (p->lineinfo[pc] != ABSLINEINFO)
- return currentline + p->lineinfo[pc];
- else
- return luaG_getfuncline(p, pc);
- }
- static void collectvalidlines (lua_State *L, Closure *f) {
- if (noLuaClosure(f)) {
- setnilvalue(s2v(L->top));
- api_incr_top(L);
- }
- else {
- int i;
- TValue v;
- const Proto *p = f->l.p;
- int currentline = p->linedefined;
- Table *t = luaH_new(L); /* new table to store active lines */
- sethvalue2s(L, L->top, t); /* push it on stack */
- api_incr_top(L);
- setbtvalue(&v); /* boolean 'true' to be the value of all indices */
- for (i = 0; i < p->sizelineinfo; i++) { /* for all lines with code */
- currentline = nextline(p, currentline, i);
- luaH_setint(L, t, currentline, &v); /* table[line] = true */
- }
- }
- }
- static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
- if (ci == NULL) /* no 'ci'? */
- return NULL; /* no info */
- else if (ci->callstatus & CIST_FIN) { /* is this a finalizer? */
- *name = "__gc";
- return "metamethod"; /* report it as such */
- }
- /* calling function is a known Lua function? */
- else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
- return funcnamefromcode(L, ci->previous, name);
- else return NULL; /* no way to find a name */
- }
- static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
- Closure *f, CallInfo *ci) {
- int status = 1;
- for (; *what; what++) {
- switch (*what) {
- case 'S': {
- funcinfo(ar, f);
- break;
- }
- case 'l': {
- ar->currentline = (ci && isLua(ci)) ? getcurrentline(ci) : -1;
- break;
- }
- case 'u': {
- ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
- if (noLuaClosure(f)) {
- ar->isvararg = 1;
- ar->nparams = 0;
- }
- else {
- ar->isvararg = f->l.p->is_vararg;
- ar->nparams = f->l.p->numparams;
- }
- break;
- }
- case 't': {
- ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
- break;
- }
- case 'n': {
- ar->namewhat = getfuncname(L, ci, &ar->name);
- if (ar->namewhat == NULL) {
- ar->namewhat = ""; /* not found */
- ar->name = NULL;
- }
- break;
- }
- case 'r': {
- if (ci == NULL || !(ci->callstatus & CIST_TRAN))
- ar->ftransfer = ar->ntransfer = 0;
- else {
- ar->ftransfer = ci->u2.transferinfo.ftransfer;
- ar->ntransfer = ci->u2.transferinfo.ntransfer;
- }
- break;
- }
- case 'L':
- case 'f': /* handled by lua_getinfo */
- break;
- default: status = 0; /* invalid option */
- }
- }
- return status;
- }
- LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
- int status;
- Closure *cl;
- CallInfo *ci;
- TValue *func;
- lua_lock(L);
- if (*what == '>') {
- ci = NULL;
- func = s2v(L->top - 1);
- api_check(L, ttisfunction(func), "function expected");
- what++; /* skip the '>' */
- L->top--; /* pop function */
- }
- else {
- ci = ar->i_ci;
- func = s2v(ci->func);
- lua_assert(ttisfunction(func));
- }
- cl = ttisclosure(func) ? clvalue(func) : NULL;
- status = auxgetinfo(L, what, ar, cl, ci);
- if (strchr(what, 'f')) {
- setobj2s(L, L->top, func);
- api_incr_top(L);
- }
- if (strchr(what, 'L'))
- collectvalidlines(L, cl);
- lua_unlock(L);
- return status;
- }
- /*
- ** {======================================================
- ** Symbolic Execution
- ** =======================================================
- */
- static const char *getobjname (const Proto *p, int lastpc, int reg,
- const char **name);
- /*
- ** Find a "name" for the constant 'c'.
- */
- static void kname (const Proto *p, int c, const char **name) {
- TValue *kvalue = &p->k[c];
- *name = (ttisstring(kvalue)) ? svalue(kvalue) : "?";
- }
- /*
- ** Find a "name" for the register 'c'.
- */
- static void rname (const Proto *p, int pc, int c, const char **name) {
- const char *what = getobjname(p, pc, c, name); /* search for 'c' */
- if (!(what && *what == 'c')) /* did not find a constant name? */
- *name = "?";
- }
- /*
- ** Find a "name" for a 'C' value in an RK instruction.
- */
- static void rkname (const Proto *p, int pc, Instruction i, const char **name) {
- int c = GETARG_C(i); /* key index */
- if (GETARG_k(i)) /* is 'c' a constant? */
- kname(p, c, name);
- else /* 'c' is a register */
- rname(p, pc, c, name);
- }
- static int filterpc (int pc, int jmptarget) {
- if (pc < jmptarget) /* is code conditional (inside a jump)? */
- return -1; /* cannot know who sets that register */
- else return pc; /* current position sets that register */
- }
- /*
- ** Try to find last instruction before 'lastpc' that modified register 'reg'.
- */
- static int findsetreg (const Proto *p, int lastpc, int reg) {
- int pc;
- int setreg = -1; /* keep last instruction that changed 'reg' */
- int jmptarget = 0; /* any code before this address is conditional */
- if (testMMMode(GET_OPCODE(p->code[lastpc])))
- lastpc--; /* previous instruction was not actually executed */
- for (pc = 0; pc < lastpc; pc++) {
- Instruction i = p->code[pc];
- OpCode op = GET_OPCODE(i);
- int a = GETARG_A(i);
- int change; /* true if current instruction changed 'reg' */
- switch (op) {
- case OP_LOADNIL: { /* set registers from 'a' to 'a+b' */
- int b = GETARG_B(i);
- change = (a <= reg && reg <= a + b);
- break;
- }
- case OP_TFORCALL: { /* affect all regs above its base */
- change = (reg >= a + 2);
- break;
- }
- case OP_CALL:
- case OP_TAILCALL: { /* affect all registers above base */
- change = (reg >= a);
- break;
- }
- case OP_JMP: { /* doesn't change registers, but changes 'jmptarget' */
- int b = GETARG_sJ(i);
- int dest = pc + 1 + b;
- /* jump does not skip 'lastpc' and is larger than current one? */
- if (dest <= lastpc && dest > jmptarget)
- jmptarget = dest; /* update 'jmptarget' */
- change = 0;
- break;
- }
- default: /* any instruction that sets A */
- change = (testAMode(op) && reg == a);
- break;
- }
- if (change)
- setreg = filterpc(pc, jmptarget);
- }
- return setreg;
- }
- /*
- ** Check whether table being indexed by instruction 'i' is the
- ** environment '_ENV'
- */
- static const char *gxf (const Proto *p, int pc, Instruction i, int isup) {
- int t = GETARG_B(i); /* table index */
- const char *name; /* name of indexed variable */
- if (isup) /* is an upvalue? */
- name = upvalname(p, t);
- else
- getobjname(p, pc, t, &name);
- return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field";
- }
- static const char *getobjname (const Proto *p, int lastpc, int reg,
- const char **name) {
- int pc;
- *name = luaF_getlocalname(p, reg + 1, lastpc);
- if (*name) /* is a local? */
- return "local";
- /* else try symbolic execution */
- pc = findsetreg(p, lastpc, reg);
- if (pc != -1) { /* could find instruction? */
- Instruction i = p->code[pc];
- OpCode op = GET_OPCODE(i);
- switch (op) {
- case OP_MOVE: {
- int b = GETARG_B(i); /* move from 'b' to 'a' */
- if (b < GETARG_A(i))
- return getobjname(p, pc, b, name); /* get name for 'b' */
- break;
- }
- case OP_GETTABUP: {
- int k = GETARG_C(i); /* key index */
- kname(p, k, name);
- return gxf(p, pc, i, 1);
- }
- case OP_GETTABLE: {
- int k = GETARG_C(i); /* key index */
- rname(p, pc, k, name);
- return gxf(p, pc, i, 0);
- }
- case OP_GETI: {
- *name = "integer index";
- return "field";
- }
- case OP_GETFIELD: {
- int k = GETARG_C(i); /* key index */
- kname(p, k, name);
- return gxf(p, pc, i, 0);
- }
- case OP_GETUPVAL: {
- *name = upvalname(p, GETARG_B(i));
- return "upvalue";
- }
- case OP_LOADK:
- case OP_LOADKX: {
- int b = (op == OP_LOADK) ? GETARG_Bx(i)
- : GETARG_Ax(p->code[pc + 1]);
- if (ttisstring(&p->k[b])) {
- *name = svalue(&p->k[b]);
- return "constant";
- }
- break;
- }
- case OP_SELF: {
- rkname(p, pc, i, name);
- return "method";
- }
- default: break; /* go through to return NULL */
- }
- }
- return NULL; /* could not find reasonable name */
- }
- /*
- ** Try to find a name for a function based on the code that called it.
- ** (Only works when function was called by a Lua function.)
- ** Returns what the name is (e.g., "for iterator", "method",
- ** "metamethod") and sets '*name' to point to the name.
- */
- static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
- const char **name) {
- TMS tm = (TMS)0; /* (initial value avoids warnings) */
- const Proto *p = ci_func(ci)->p; /* calling function */
- int pc = currentpc(ci); /* calling instruction index */
- Instruction i = p->code[pc]; /* calling instruction */
- if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */
- *name = "?";
- return "hook";
- }
- switch (GET_OPCODE(i)) {
- case OP_CALL:
- case OP_TAILCALL:
- return getobjname(p, pc, GETARG_A(i), name); /* get function name */
- case OP_TFORCALL: { /* for iterator */
- *name = "for iterator";
- return "for iterator";
- }
- /* other instructions can do calls through metamethods */
- case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:
- case OP_GETI: case OP_GETFIELD:
- tm = TM_INDEX;
- break;
- case OP_SETTABUP: case OP_SETTABLE: case OP_SETI: case OP_SETFIELD:
- tm = TM_NEWINDEX;
- break;
- case OP_MMBIN: case OP_MMBINI: case OP_MMBINK: {
- tm = cast(TMS, GETARG_C(i));
- break;
- }
- case OP_UNM: tm = TM_UNM; break;
- case OP_BNOT: tm = TM_BNOT; break;
- case OP_LEN: tm = TM_LEN; break;
- case OP_CONCAT: tm = TM_CONCAT; break;
- case OP_EQ: tm = TM_EQ; break;
- case OP_LT: case OP_LE: case OP_LTI: case OP_LEI:
- *name = "order"; /* '<=' can call '__lt', etc. */
- return "metamethod";
- case OP_CLOSE: case OP_RETURN:
- *name = "close";
- return "metamethod";
- default:
- return NULL; /* cannot find a reasonable name */
- }
- *name = getstr(G(L)->tmname[tm]) + 2;
- return "metamethod";
- }
- /* }====================================================== */
- /*
- ** The subtraction of two potentially unrelated pointers is
- ** not ISO C, but it should not crash a program; the subsequent
- ** checks are ISO C and ensure a correct result.
- */
- static int isinstack (CallInfo *ci, const TValue *o) {
- StkId base = ci->func + 1;
- ptrdiff_t i = cast(StkId, o) - base;
- return (0 <= i && i < (ci->top - base) && s2v(base + i) == o);
- }
- /*
- ** Checks whether value 'o' came from an upvalue. (That can only happen
- ** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
- ** upvalues.)
- */
- static const char *getupvalname (CallInfo *ci, const TValue *o,
- const char **name) {
- LClosure *c = ci_func(ci);
- int i;
- for (i = 0; i < c->nupvalues; i++) {
- if (c->upvals[i]->v == o) {
- *name = upvalname(c->p, i);
- return "upvalue";
- }
- }
- return NULL;
- }
- static const char *varinfo (lua_State *L, const TValue *o) {
- const char *name = NULL; /* to avoid warnings */
- CallInfo *ci = L->ci;
- const char *kind = NULL;
- if (isLua(ci)) {
- kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */
- if (!kind && isinstack(ci, o)) /* no? try a register */
- kind = getobjname(ci_func(ci)->p, currentpc(ci),
- cast_int(cast(StkId, o) - (ci->func + 1)), &name);
- }
- return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
- }
- l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
- const char *t = luaT_objtypename(L, o);
- luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));
- }
- l_noret luaG_forerror (lua_State *L, const TValue *o, const char *what) {
- luaG_runerror(L, "bad 'for' %s (number expected, got %s)",
- what, luaT_objtypename(L, o));
- }
- l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
- if (ttisstring(p1) || cvt2str(p1)) p1 = p2;
- luaG_typeerror(L, p1, "concatenate");
- }
- l_noret luaG_opinterror (lua_State *L, const TValue *p1,
- const TValue *p2, const char *msg) {
- if (!ttisnumber(p1)) /* first operand is wrong? */
- p2 = p1; /* now second is wrong */
- luaG_typeerror(L, p2, msg);
- }
- /*
- ** Error when both values are convertible to numbers, but not to integers
- */
- l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
- lua_Integer temp;
- if (!tointegerns(p1, &temp))
- p2 = p1;
- luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
- }
- l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
- const char *t1 = luaT_objtypename(L, p1);
- const char *t2 = luaT_objtypename(L, p2);
- if (strcmp(t1, t2) == 0)
- luaG_runerror(L, "attempt to compare two %s values", t1);
- else
- luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
- }
- /* add src:line information to 'msg' */
- const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,
- int line) {
- char buff[LUA_IDSIZE];
- if (src)
- luaO_chunkid(buff, getstr(src), tsslen(src));
- else { /* no source available; use "?" instead */
- buff[0] = '?'; buff[1] = '\0';
- }
- return luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
- }
- l_noret luaG_errormsg (lua_State *L) {
- if (L->errfunc != 0) { /* is there an error handling function? */
- StkId errfunc = restorestack(L, L->errfunc);
- lua_assert(ttisfunction(s2v(errfunc)));
- setobjs2s(L, L->top, L->top - 1); /* move argument */
- setobjs2s(L, L->top - 1, errfunc); /* push function */
- L->top++; /* assume EXTRA_STACK */
- luaD_callnoyield(L, L->top - 2, 1); /* call it */
- }
- luaD_throw(L, LUA_ERRRUN);
- }
- l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
- CallInfo *ci = L->ci;
- const char *msg;
- va_list argp;
- luaC_checkGC(L); /* error message uses memory */
- va_start(argp, fmt);
- msg = luaO_pushvfstring(L, fmt, argp); /* format message */
- va_end(argp);
- if (isLua(ci)) /* if Lua function, add source:line information */
- luaG_addinfo(L, msg, ci_func(ci)->p->source, getcurrentline(ci));
- luaG_errormsg(L);
- }
- /*
- ** Check whether new instruction 'newpc' is in a different line from
- ** previous instruction 'oldpc'.
- */
- static int changedline (const Proto *p, int oldpc, int newpc) {
- if (p->lineinfo == NULL) /* no debug information? */
- return 0;
- while (oldpc++ < newpc) {
- if (p->lineinfo[oldpc] != 0)
- return (luaG_getfuncline(p, oldpc - 1) != luaG_getfuncline(p, newpc));
- }
- return 0; /* no line changes between positions */
- }
- /*
- ** Traces the execution of a Lua function. Called before the execution
- ** of each opcode, when debug is on. 'L->oldpc' stores the last
- ** instruction traced, to detect line changes. When entering a new
- ** function, 'npci' will be zero and will test as a new line without
- ** the need for 'oldpc'; so, 'oldpc' does not need to be initialized
- ** before. Some exceptional conditions may return to a function without
- ** updating 'oldpc'. In that case, 'oldpc' may be invalid; if so, it is
- ** reset to zero. (A wrong but valid 'oldpc' at most causes an extra
- ** call to a line hook.)
- */
- int luaG_traceexec (lua_State *L, const Instruction *pc) {
- CallInfo *ci = L->ci;
- lu_byte mask = L->hookmask;
- const Proto *p = ci_func(ci)->p;
- int counthook;
- /* 'L->oldpc' may be invalid; reset it in this case */
- int oldpc = (L->oldpc < p->sizecode) ? L->oldpc : 0;
- if (!(mask & (LUA_MASKLINE | LUA_MASKCOUNT))) { /* no hooks? */
- ci->u.l.trap = 0; /* don't need to stop again */
- return 0; /* turn off 'trap' */
- }
- pc++; /* reference is always next instruction */
- ci->u.l.savedpc = pc; /* save 'pc' */
- counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
- if (counthook)
- resethookcount(L); /* reset count */
- else if (!(mask & LUA_MASKLINE))
- return 1; /* no line hook and count != 0; nothing to be done now */
- if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
- ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
- return 1; /* do not call hook again (VM yielded, so it did not move) */
- }
- if (!isIT(*(ci->u.l.savedpc - 1)))
- L->top = ci->top; /* prepare top */
- if (counthook)
- luaD_hook(L, LUA_HOOKCOUNT, -1, 0, 0); /* call count hook */
- if (mask & LUA_MASKLINE) {
- int npci = pcRel(pc, p);
- if (npci == 0 || /* call linehook when enter a new function, */
- pc <= invpcRel(oldpc, p) || /* when jump back (loop), or when */
- changedline(p, oldpc, npci)) { /* enter new line */
- int newline = luaG_getfuncline(p, npci);
- luaD_hook(L, LUA_HOOKLINE, newline, 0, 0); /* call line hook */
- }
- L->oldpc = npci; /* 'pc' of last call to line hook */
- }
- if (L->status == LUA_YIELD) { /* did hook yield? */
- if (counthook)
- L->hookcount = 1; /* undo decrement to zero */
- ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
- ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
- luaD_throw(L, LUA_YIELD);
- }
- return 1; /* keep 'trap' on */
- }
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