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lua/ldebug.c

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/*
** $Id: ldebug.c,v 1.114 2002/05/13 13:09:00 roberto Exp roberto $
** Debug Interface
** See Copyright Notice in lua.h
*/
#include <stdlib.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 "luadebug.h"
#include "lvm.h"
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
static int isLmark (CallInfo *ci) {
return (ttype(ci->base - 1) == LUA_TFUNCTION && !ci_func(ci)->c.isC);
}
static int currentpc (lua_State *L, CallInfo *ci) {
if (ci->pc == NULL) return -1; /* function is not an active Lua function */
if (ci == L->ci || ci->pc != (ci+1)->pc) /* no other function using `pc'? */
ci->savedpc = *ci->pc; /* may not be saved; save it */
/* function's pc is saved */
return pcRel(ci->savedpc, ci_func(ci)->l.p);
}
static int currentline (lua_State *L, CallInfo *ci) {
int pc = currentpc(L, ci);
if (pc < 0)
return -1; /* only active lua functions have current-line information */
else
return getline(ci_func(ci)->l.p, pc);
}
LUA_API lua_Hook lua_setcallhook (lua_State *L, lua_Hook func) {
lua_Hook oldhook;
lua_lock(L);
oldhook = L->callhook;
L->callhook = func;
lua_unlock(L);
return oldhook;
}
LUA_API lua_Hook lua_setlinehook (lua_State *L, lua_Hook func) {
CallInfo *ci;
lua_Hook oldhook;
lua_lock(L);
oldhook = L->linehook;
L->linehook = func;
for (ci = L->base_ci; ci <= L->ci; ci++)
currentpc(L, ci); /* update `savedpc' */
lua_unlock(L);
return oldhook;
}
LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
int status;
lua_lock(L);
if (L->ci - L->base_ci <= level) status = 0; /* there is no such level */
else {
ar->i_ci = (L->ci - L->base_ci) - level;
status = 1;
}
lua_unlock(L);
return status;
}
static Proto *getluaproto (CallInfo *ci) {
return (isLmark(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(L, 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(L, ci));
if (!name || name[0] == '(') /* `(' starts private locals */
name = NULL;
else
setobj(ci->base+(n-1), L->top);
}
lua_unlock(L);
return name;
}
static void infoLproto (lua_Debug *ar, Proto *f) {
ar->source = getstr(f->source);
ar->linedefined = f->lineDefined;
ar->what = "Lua";
}
static void funcinfo (lua_State *L, lua_Debug *ar, StkId func) {
Closure *cl;
if (ttype(func) == LUA_TFUNCTION)
cl = clvalue(func);
else {
luaD_runerror(L, "value for `lua_getinfo' is not a function");
cl = NULL; /* to avoid warnings */
}
if (cl->c.isC) {
ar->source = "=C";
ar->linedefined = -1;
ar->what = "C";
}
else
infoLproto(ar, cl->l.p);
luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
if (ar->linedefined == 0)
ar->what = "main";
}
static const char *travglobals (lua_State *L, const TObject *o) {
Table *g = hvalue(gt(L));
int i = sizenode(g);
while (i--) {
Node *n = node(g, i);
if (luaO_equalObj(o, val(n)) && ttype(key(n)) == LUA_TSTRING)
return getstr(tsvalue(key(n)));
}
return NULL;
}
static void getname (lua_State *L, const TObject *f, lua_Debug *ar) {
/* try to find a name for given function */
if ((ar->name = travglobals(L, f)) != NULL)
ar->namewhat = "global";
else ar->namewhat = ""; /* not found */
}
LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
StkId f;
CallInfo *ci;
int status = 1;
lua_lock(L);
if (*what != '>') { /* function is active? */
ci = L->base_ci + ar->i_ci;
f = ci->base - 1;
}
else {
what++; /* skip the `>' */
ci = NULL;
f = L->top - 1;
}
for (; *what; what++) {
switch (*what) {
case 'S': {
funcinfo(L, ar, f);
break;
}
case 'l': {
ar->currentline = (ci) ? currentline(L, ci) : -1;
break;
}
case 'u': {
ar->nups = (ttype(f) == LUA_TFUNCTION) ? clvalue(f)->c.nupvalues : 0;
break;
}
case 'n': {
ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
if (ar->namewhat == NULL)
getname(L, f, ar);
break;
}
case 'f': {
setobj(L->top, f);
status = 2;
break;
}
default: status = 0; /* invalid option */
}
}
if (!ci) L->top--; /* pop function */
if (status == 2) 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);
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 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);
if (testOpMode(op, OpModeCreg))
check(c < pt->maxstacksize ||
(c >= MAXSTACK && c-MAXSTACK < pt->sizek));
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->nupvalues);
break;
}
case OP_GETGLOBAL:
case OP_SETGLOBAL: {
check(ttype(&pt->k[b]) == LUA_TSTRING);
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+2+c);
/* 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: {
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_TAILCALL:
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]->nupvalues;
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];
}
/* }====================================================== */
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 && ttype(&p->k[c]) == LUA_TSTRING)
return svalue(&p->k[c]);
else
return "?";
}
static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos,
const char **name) {
if (isLmark(ci)) { /* an active Lua function? */
Proto *p = ci_func(ci)->l.p;
int pc = currentpc(L, 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: {
lua_assert(ttype(&p->k[GETARG_Bx(i)]) == LUA_TSTRING);
*name = svalue(&p->k[GETARG_Bx(i)]);
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(L, ci, b, name); /* get name for `b' */
break;
}
case OP_GETTABLE: {
*name = kname(p, GETARG_C(i));
return "field";
break;
}
case OP_SELF: {
*name = kname(p, GETARG_C(i));
return "method";
break;
}
default: break;
}
}
return NULL; /* no useful name found */
}
static Instruction getcurrentinstr (lua_State *L, CallInfo *ci) {
if (ci == L->base_ci || !isLmark(ci))
return (Instruction)(-1); /* not an active Lua function */
else
return ci_func(ci)->l.p->code[currentpc(L, ci)];
}
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
Instruction i;
ci--; /* calling function */
i = getcurrentinstr(L, ci);
return (GET_OPCODE(i) == OP_CALL ? getobjname(L, ci, GETARG_A(i), name)
: NULL); /* no useful name 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;
const char *t = luaT_typenames[ttype(o)];
const char *kind = NULL;
if (isinstack(L->ci, o))
kind = getobjname(L, L->ci, o - L->ci->base, &name);
if (kind)
luaO_verror(L, "attempt to %s %s `%s' (a %s value)",
op, kind, name, t);
else
luaO_verror(L, "attempt to %s a %s value", op, t);
}
void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
if (ttype(p1) == LUA_TSTRING) p1 = p2;
lua_assert(ttype(p1) != LUA_TSTRING);
luaG_typeerror(L, p1, "concat");
}
void luaG_aritherror (lua_State *L, StkId 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");
}
void 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])
luaO_verror(L, "attempt to compare two %s values", t1);
else
luaO_verror(L, "attempt to compare %s with %s", t1, t2);
}
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