0,0 → 1,577 |
/* |
** $Id: ldebug.c,v 2.88 2011/11/30 12:43:51 roberto Exp $ |
** Debug Interface |
** See Copyright Notice in lua.h |
*/ |
|
|
#include <stdarg.h> |
#include <stddef.h> |
#include <string.h> |
|
|
#define ldebug_c |
#define LUA_CORE |
|
#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 (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); |
} |
|
|
static int currentline (CallInfo *ci) { |
return getfuncline(ci_func(ci)->p, currentpc(ci)); |
} |
|
|
/* |
** 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; |
} |
if (isLua(L->ci)) |
L->oldpc = L->ci->u.l.savedpc; |
L->hook = func; |
L->basehookcount = count; |
resethookcount(L); |
L->hookmask = cast_byte(mask); |
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; |
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 (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) { |
int nparams = clLvalue(ci->func)->p->numparams; |
if (n >= ci->u.l.base - ci->func - nparams) |
return NULL; /* no such vararg */ |
else { |
*pos = ci->func + nparams + n; |
return "(*vararg)"; /* generic name for any vararg */ |
} |
} |
|
|
static const char *findlocal (lua_State *L, CallInfo *ci, int n, |
StkId *pos) { |
const char *name = NULL; |
StkId base; |
if (isLua(ci)) { |
if (n < 0) /* access to vararg values? */ |
return findvararg(ci, -n, pos); |
else { |
base = ci->u.l.base; |
name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci)); |
} |
} |
else |
base = ci->func + 1; |
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? */ |
name = "(*temporary)"; /* generic name for any valid slot */ |
else |
return NULL; /* no name */ |
} |
*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(L->top - 1)) /* not a Lua function? */ |
name = NULL; |
else /* consider live variables at function start (parameters) */ |
name = luaF_getlocalname(clLvalue(L->top - 1)->p, n, 0); |
} |
else { /* active function; get information through 'ar' */ |
StkId pos = 0; /* to avoid warnings */ |
name = findlocal(L, ar->i_ci, n, &pos); |
if (name) { |
setobj2s(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 = 0; /* to avoid warnings */ |
const char *name = findlocal(L, ar->i_ci, n, &pos); |
lua_lock(L); |
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 (cl == NULL || cl->c.isC) { |
ar->source = "=[C]"; |
ar->linedefined = -1; |
ar->lastlinedefined = -1; |
ar->what = "C"; |
} |
else { |
Proto *p = cl->l.p; |
ar->source = p->source ? getstr(p->source) : "=?"; |
ar->linedefined = p->linedefined; |
ar->lastlinedefined = p->lastlinedefined; |
ar->what = (ar->linedefined == 0) ? "main" : "Lua"; |
} |
luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE); |
} |
|
|
static void collectvalidlines (lua_State *L, Closure *f) { |
if (f == NULL || f->c.isC) { |
setnilvalue(L->top); |
incr_top(L); |
} |
else { |
int i; |
TValue v; |
int *lineinfo = f->l.p->lineinfo; |
Table *t = luaH_new(L); /* new table to store active lines */ |
sethvalue(L, L->top, t); /* push it on stack */ |
incr_top(L); |
setbvalue(&v, 1); /* boolean 'true' to be the value of all indices */ |
for (i = 0; i < f->l.p->sizelineinfo; i++) /* for all lines with code */ |
luaH_setint(L, t, lineinfo[i], &v); /* table[line] = true */ |
} |
} |
|
|
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)) ? currentline(ci) : -1; |
break; |
} |
case 'u': { |
ar->nups = (f == NULL) ? 0 : f->c.nupvalues; |
if (f == NULL || f->c.isC) { |
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': { |
/* calling function is a known Lua function? */ |
if (ci && !(ci->callstatus & CIST_TAIL) && isLua(ci->previous)) |
ar->namewhat = getfuncname(L, ci->previous, &ar->name); |
else |
ar->namewhat = NULL; |
if (ar->namewhat == NULL) { |
ar->namewhat = ""; /* not found */ |
ar->name = NULL; |
} |
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; |
StkId func; |
lua_lock(L); |
if (*what == '>') { |
ci = NULL; |
func = L->top - 1; |
api_check(L, ttisfunction(func), "function expected"); |
what++; /* skip the '>' */ |
L->top--; /* pop function */ |
} |
else { |
ci = ar->i_ci; |
func = ci->func; |
lua_assert(ttisfunction(ci->func)); |
} |
cl = ttisclosure(func) ? clvalue(func) : NULL; |
status = auxgetinfo(L, what, ar, cl, ci); |
if (strchr(what, 'f')) { |
setobjs2s(L, L->top, func); |
incr_top(L); |
} |
if (strchr(what, 'L')) |
collectvalidlines(L, cl); |
lua_unlock(L); |
return status; |
} |
|
|
/* |
** {====================================================== |
** Symbolic Execution |
** ======================================================= |
*/ |
|
static const char *getobjname (Proto *p, int lastpc, int reg, |
const char **name); |
|
|
/* |
** find a "name" for the RK value 'c' |
*/ |
static void kname (Proto *p, int pc, int c, const char **name) { |
if (ISK(c)) { /* is 'c' a constant? */ |
TValue *kvalue = &p->k[INDEXK(c)]; |
if (ttisstring(kvalue)) { /* literal constant? */ |
*name = svalue(kvalue); /* it is its own name */ |
return; |
} |
/* else no reasonable name found */ |
} |
else { /* 'c' is a register */ |
const char *what = getobjname(p, pc, c, name); /* search for 'c' */ |
if (what && *what == 'c') { /* found a constant name? */ |
return; /* 'name' already filled */ |
} |
/* else no reasonable name found */ |
} |
*name = "?"; /* no reasonable name found */ |
} |
|
|
/* |
** try to find last instruction before 'lastpc' that modified register 'reg' |
*/ |
static int findsetreg (Proto *p, int lastpc, int reg) { |
int pc; |
int setreg = -1; /* keep last instruction that changed 'reg' */ |
for (pc = 0; pc < lastpc; pc++) { |
Instruction i = p->code[pc]; |
OpCode op = GET_OPCODE(i); |
int a = GETARG_A(i); |
switch (op) { |
case OP_LOADNIL: { |
int b = GETARG_B(i); |
if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */ |
setreg = pc; |
break; |
} |
case OP_TFORCALL: { |
if (reg >= a + 2) setreg = pc; /* affect all regs above its base */ |
break; |
} |
case OP_CALL: |
case OP_TAILCALL: { |
if (reg >= a) setreg = pc; /* affect all registers above base */ |
break; |
} |
case OP_JMP: { |
int b = GETARG_sBx(i); |
int dest = pc + 1 + b; |
/* jump is forward and do not skip `lastpc'? */ |
if (pc < dest && dest <= lastpc) |
pc += b; /* do the jump */ |
break; |
} |
case OP_TEST: { |
if (reg == a) setreg = pc; /* jumped code can change 'a' */ |
break; |
} |
default: |
if (testAMode(op) && reg == a) /* any instruction that set A */ |
setreg = pc; |
break; |
} |
} |
return setreg; |
} |
|
|
static const char *getobjname (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: |
case OP_GETTABLE: { |
int k = GETARG_C(i); /* key index */ |
int t = GETARG_B(i); /* table index */ |
const char *vn = (op == OP_GETTABLE) /* name of indexed variable */ |
? luaF_getlocalname(p, t + 1, pc) |
: upvalname(p, t); |
kname(p, pc, k, name); |
return (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field"; |
} |
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: { |
int k = GETARG_C(i); /* key index */ |
kname(p, pc, k, name); |
return "method"; |
} |
default: break; /* go through to return NULL */ |
} |
} |
return NULL; /* could not find reasonable name */ |
} |
|
|
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) { |
TMS tm; |
Proto *p = ci_func(ci)->p; /* calling function */ |
int pc = currentpc(ci); /* calling instruction index */ |
Instruction i = p->code[pc]; /* calling instruction */ |
switch (GET_OPCODE(i)) { |
case OP_CALL: |
case OP_TAILCALL: /* get function name */ |
return getobjname(p, pc, GETARG_A(i), name); |
case OP_TFORCALL: { /* for iterator */ |
*name = "for iterator"; |
return "for iterator"; |
} |
/* all other instructions can call only through metamethods */ |
case OP_SELF: |
case OP_GETTABUP: |
case OP_GETTABLE: tm = TM_INDEX; break; |
case OP_SETTABUP: |
case OP_SETTABLE: tm = TM_NEWINDEX; break; |
case OP_EQ: tm = TM_EQ; break; |
case OP_ADD: tm = TM_ADD; break; |
case OP_SUB: tm = TM_SUB; break; |
case OP_MUL: tm = TM_MUL; break; |
case OP_DIV: tm = TM_DIV; break; |
case OP_MOD: tm = TM_MOD; break; |
case OP_POW: tm = TM_POW; break; |
case OP_UNM: tm = TM_UNM; break; |
case OP_LEN: tm = TM_LEN; break; |
case OP_LT: tm = TM_LT; break; |
case OP_LE: tm = TM_LE; break; |
case OP_CONCAT: tm = TM_CONCAT; break; |
default: |
return NULL; /* else no useful name can be found */ |
} |
*name = getstr(G(L)->tmname[tm]); |
return "metamethod"; |
} |
|
/* }====================================================== */ |
|
|
|
/* |
** only ANSI way to check whether a pointer points to an array |
** (used only for error messages, so efficiency is not a big concern) |
*/ |
static int isinstack (CallInfo *ci, const TValue *o) { |
StkId p; |
for (p = ci->u.l.base; p < ci->top; p++) |
if (o == p) return 1; |
return 0; |
} |
|
|
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; |
} |
|
|
l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) { |
CallInfo *ci = L->ci; |
const char *name = NULL; |
const char *t = objtypename(o); |
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(o - ci->u.l.base), &name); |
} |
if (kind) |
luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)", |
op, kind, name, t); |
else |
luaG_runerror(L, "attempt to %s a %s value", op, t); |
} |
|
|
l_noret luaG_concaterror (lua_State *L, StkId p1, StkId p2) { |
if (ttisstring(p1) || ttisnumber(p1)) p1 = p2; |
lua_assert(!ttisstring(p1) && !ttisnumber(p2)); |
luaG_typeerror(L, p1, "concatenate"); |
} |
|
|
l_noret luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) { |
TValue temp; |
if (luaV_tonumber(p1, &temp) == NULL) |
p2 = p1; /* first operand is wrong */ |
luaG_typeerror(L, p2, "perform arithmetic on"); |
} |
|
|
l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) { |
const char *t1 = objtypename(p1); |
const char *t2 = objtypename(p2); |
if (t1 == t2) |
luaG_runerror(L, "attempt to compare two %s values", t1); |
else |
luaG_runerror(L, "attempt to compare %s with %s", t1, t2); |
} |
|
|
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); |
TString *src = ci_func(ci)->p->source; |
if (src) |
luaO_chunkid(buff, getstr(src), LUA_IDSIZE); |
else { /* no source available; use "?" instead */ |
buff[0] = '?'; buff[1] = '\0'; |
} |
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); |
if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR); |
setobjs2s(L, L->top, L->top - 1); /* move argument */ |
setobjs2s(L, L->top - 1, errfunc); /* push function */ |
incr_top(L); |
luaD_call(L, L->top - 2, 1, 0); /* call it */ |
} |
luaD_throw(L, LUA_ERRRUN); |
} |
|
|
l_noret 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); |
} |
|