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|
/*
** Error handling and debugging API.
** Copyright (C) 2005-2009 Mike Pall. See Copyright Notice in luajit.h
**
** Portions taken verbatim or adapted from the Lua interpreter.
** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
*/
#define lj_err_c
#define LUA_CORE
#include "lj_obj.h"
#include "lj_err.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_func.h"
#include "lj_state.h"
#include "lj_frame.h"
#include "lj_bc.h"
#include "lj_trace.h"
#include "lj_vm.h"
/* -- Error messages ------------------------------------------------------ */
/* Error message strings. */
static const char *lj_err_allmsg =
#define ERRDEF(name, msg) msg "\0"
#include "lj_errmsg.h"
;
#define err2msg(em) (lj_err_allmsg+(int)(em))
/* -- Frame and function introspection ------------------------------------ */
static BCPos currentpc(lua_State *L, GCfunc *fn, cTValue *nextframe)
{
const BCIns *ins;
lua_assert(fn->c.gct == ~LJ_TFUNC || fn->c.gct == ~LJ_TTHREAD);
if (!isluafunc(fn)) { /* Cannot derive a PC for non-Lua functions. */
return ~(BCPos)0;
} else if (nextframe == NULL) { /* Lua function on top. */
ins = cframe_Lpc(L); /* Only happens during error/hook handling. */
} else {
if (frame_islua(nextframe)) {
ins = frame_pc(nextframe);
} else if (frame_iscont(nextframe)) {
ins = frame_contpc(nextframe);
} else {
/* Lua function below errfunc/gc/hook: find cframe to get the PC. */
void *cf = cframe_raw(L->cframe);
TValue *f = L->base-1;
while (f > nextframe) {
if (frame_islua(f)) {
f = frame_prevl(f);
} else {
if (frame_isc(f))
cf = cframe_raw(cframe_prev(cf));
f = frame_prevd(f);
}
}
if (cframe_prev(cf))
cf = cframe_raw(cframe_prev(cf));
ins = cframe_pc(cf);
}
}
return (BCPos)((ins - funcproto(fn)->bc) - 1);
}
static BCLine currentline(lua_State *L, GCfunc *fn, cTValue *nextframe)
{
BCPos pc = currentpc(L, fn, nextframe);
if (pc != ~(BCPos)0) {
GCproto *pt = funcproto(fn);
lua_assert(pc < pt->sizebc);
return pt->lineinfo ? pt->lineinfo[pc] : 0;
} else {
return -1;
}
}
static const char *getvarname(const GCproto *pt, BCPos pc, BCReg slot)
{
MSize i;
for (i = 0; i < pt->sizevarinfo && pt->varinfo[i].startpc <= pc; i++)
if (pc < pt->varinfo[i].endpc && slot-- == 0)
return strdata(pt->varinfo[i].name);
return NULL;
}
static const char *getobjname(GCproto *pt, const BCIns *ip, BCReg slot,
const char **name)
{
const char *lname;
restart:
lname = getvarname(pt, (BCPos)(ip - pt->bc), slot);
if (lname != NULL) { *name = lname; return "local"; }
while (--ip >= pt->bc) {
BCIns ins = *ip;
BCOp op = bc_op(ins);
BCReg ra = bc_a(ins);
if (bcmode_a(op) == BCMbase) {
if (slot >= ra && (op != BC_KNIL || slot <= bc_d(ins)))
return NULL;
} else if (bcmode_a(op) == BCMdst && ra == slot) {
switch (bc_op(ins)) {
case BC_MOV:
if (ra == slot) { slot = bc_d(ins); goto restart; }
break;
case BC_GGET:
*name = strdata(gco2str(gcref(pt->k.gc[~bc_d(ins)])));
return "global";
case BC_TGETS:
*name = strdata(gco2str(gcref(pt->k.gc[~bc_c(ins)])));
if (ip > pt->bc) {
BCIns insp = ip[-1];
if (bc_op(insp) == BC_MOV && bc_a(insp) == ra+1 &&
bc_d(insp) == bc_b(ins))
return "method";
}
return "field";
case BC_UGET:
*name = pt->uvname ? strdata(pt->uvname[bc_d(ins)]) : "?";
return "upvalue";
default:
return NULL;
}
}
}
return NULL;
}
static const char *getfuncname(lua_State *L, TValue *frame, const char **name)
{
MMS mm;
const BCIns *ip;
TValue *pframe;
GCfunc *fn;
BCPos pc;
if (frame_isvarg(frame))
frame = frame_prevd(frame);
pframe = frame_prev(frame);
fn = frame_func(pframe);
pc = currentpc(L, fn, frame);
if (pc == ~(BCPos)0)
return NULL;
lua_assert(pc < funcproto(fn)->sizebc);
ip = &funcproto(fn)->bc[pc];
mm = bcmode_mm(bc_op(*ip));
if (mm == MM_call) {
BCReg slot = bc_a(*ip);
if (bc_op(*ip) == BC_ITERC) slot -= 3;
return getobjname(funcproto(fn), ip, slot, name);
} else if (mm != MM_MAX) {
*name = strdata(strref(G(L)->mmname[mm]));
return "metamethod";
} else {
return NULL;
}
}
void lj_err_pushloc(lua_State *L, GCproto *pt, BCPos pc)
{
GCstr *name = pt->chunkname;
if (name) {
const char *s = strdata(name);
MSize i, len = name->len;
BCLine line;
if (pc)
line = pt->lineinfo ? pt->lineinfo[pc-1] : 0;
else
line = pt->linedefined;
if (*s == '@') {
s++; len--;
for (i = len; i > 0; i--)
if (s[i] == '/' || s[i] == '\\') {
s += i+1;
break;
}
lj_str_pushf(L, "%s:%d", s, line);
} else if (len > 40) {
lj_str_pushf(L, "%p:%d", pt, line);
} else if (*s == '=') {
lj_str_pushf(L, "%s:%d", s+1, line);
} else {
lj_str_pushf(L, "\"%s\":%d", s, line);
}
} else {
lj_str_pushf(L, "%p:%u", pt, pc);
}
}
static void err_chunkid(char *out, const char *src)
{
if (*src == '=') {
strncpy(out, src+1, LUA_IDSIZE); /* remove first char */
out[LUA_IDSIZE-1] = '\0'; /* ensures null termination */
} else if (*src == '@') { /* out = "source", or "...source" */
size_t l = strlen(++src); /* skip the `@' */
if (l >= LUA_IDSIZE) {
src += l-(LUA_IDSIZE-4); /* get last part of file name */
strcpy(out, "...");
out += 3;
}
strcpy(out, src);
} else { /* out = [string "string"] */
size_t len; /* Length, up to first control char. */
for (len = 0; len < LUA_IDSIZE-11; len++)
if (((const unsigned char *)src)[len] < ' ') break;
strcpy(out, "[string \""); out += 9;
if (src[len] != '\0') { /* must truncate? */
if (len > LUA_IDSIZE-15) len = LUA_IDSIZE-15;
strncpy(out, src, len); out += len;
strcpy(out, "..."); out += 3;
} else {
strcpy(out, src); out += len;
}
strcpy(out, "\"]");
}
}
/* -- Public debug API ---------------------------------------------------- */
static TValue *findlocal(lua_State *L, const lua_Debug *ar,
const char **name, BCReg slot)
{
uint32_t offset = (uint32_t)ar->i_ci & 0xffff;
uint32_t size = (uint32_t)ar->i_ci >> 16;
TValue *frame = L->stack + offset;
TValue *nextframe = size ? frame + size : NULL;
GCfunc *fn = frame_func(frame);
BCPos pc = currentpc(L, fn, nextframe);
if (pc != ~(BCPos)0 &&
(*name = getvarname(funcproto(fn), pc, slot-1)) != NULL)
;
else if (slot > 0 && frame + slot < (nextframe ? nextframe : L->top))
*name = "(*temporary)";
else
*name = NULL;
return frame+slot;
}
LUA_API const char *lua_getlocal(lua_State *L, const lua_Debug *ar, int n)
{
const char *name;
TValue *o = findlocal(L, ar, &name, (BCReg)n);
if (name) {
copyTV(L, L->top, o);
incr_top(L);
}
return name;
}
LUA_API const char *lua_setlocal(lua_State *L, const lua_Debug *ar, int n)
{
const char *name;
TValue *o = findlocal(L, ar, &name, (BCReg)n);
if (name)
copyTV(L, o, L->top-1);
L->top--;
return name;
}
LUA_API int lua_getinfo(lua_State *L, const char *what, lua_Debug *ar)
{
int status = 1;
TValue *frame = NULL;
TValue *nextframe = NULL;
GCfunc *fn;
if (*what == '>') {
TValue *func = L->top - 1;
api_check(L, tvisfunc(func));
fn = funcV(func);
L->top--;
what++;
} else {
uint32_t offset = (uint32_t)ar->i_ci & 0xffff;
uint32_t size = (uint32_t)ar->i_ci >> 16;
lua_assert(offset != 0);
frame = L->stack + offset;
if (size) nextframe = frame + size;
lua_assert(frame<=L->maxstack && (!nextframe || nextframe<=L->maxstack));
fn = frame_func(frame);
lua_assert(fn->c.gct == ~LJ_TFUNC);
}
for (; *what; what++) {
switch (*what) {
case 'S':
if (isluafunc(fn)) {
ar->source = strdata(funcproto(fn)->chunkname);
ar->linedefined = cast_int(funcproto(fn)->linedefined);
ar->lastlinedefined = cast_int(funcproto(fn)->lastlinedefined);
ar->what = (ar->linedefined == 0) ? "main" : "Lua";
} else {
ar->source = "=[C]";
ar->linedefined = -1;
ar->lastlinedefined = -1;
ar->what = "C";
}
err_chunkid(ar->short_src, ar->source);
break;
case 'l':
ar->currentline = frame ? currentline(L, fn, nextframe) : -1;
break;
case 'u':
ar->nups = fn->c.nupvalues;
break;
case 'n':
ar->namewhat = frame ? getfuncname(L, frame, &ar->name) : NULL;
if (ar->namewhat == NULL) {
ar->namewhat = "";
ar->name = NULL;
}
break;
case 'f':
setfuncV(L, L->top, fn);
incr_top(L);
break;
case 'L':
if (isluafunc(fn)) {
GCtab *t = lj_tab_new(L, 0, 0);
BCLine *lineinfo = funcproto(fn)->lineinfo;
uint32_t i, szl = funcproto(fn)->sizelineinfo;
for (i = 0; i < szl; i++)
setboolV(lj_tab_setint(L, t, lineinfo[i]), 1);
settabV(L, L->top, t);
} else {
setnilV(L->top);
}
incr_top(L);
break;
default:
status = 0; /* Bad option. */
break;
}
}
return status;
}
cTValue *lj_err_getframe(lua_State *L, int level, int *size)
{
cTValue *frame, *nextframe;
/* Traverse frames backwards. */
for (nextframe = frame = L->base-1; frame > L->stack; ) {
if (frame_gc(frame) == obj2gco(L))
level++; /* Skip dummy frames. See lj_meta_call(). */
if (level-- == 0) {
*size = cast_int(nextframe - frame);
return frame; /* Level found. */
}
nextframe = frame;
if (frame_islua(frame)) {
frame = frame_prevl(frame);
} else {
if (frame_isvarg(frame))
level++; /* Skip vararg pseudo-frame. */
frame = frame_prevd(frame);
}
}
*size = level;
return NULL; /* Level not found. */
}
LUA_API int lua_getstack(lua_State *L, int level, lua_Debug *ar)
{
int size;
cTValue *frame = lj_err_getframe(L, level, &size);
if (frame) {
ar->i_ci = (size << 16) + cast_int(frame - L->stack);
return 1;
} else {
ar->i_ci = level - size;
return 0;
}
}
/* -- Error handling ------------------------------------------------------ */
/* Return string object for error message. */
LJ_NOINLINE GCstr *lj_err_str(lua_State *L, ErrMsg em)
{
return lj_str_newz(L, err2msg(em));
}
/* Unwind Lua stack and add error message on top. */
LJ_NOINLINE static void unwindstack(lua_State *L, TValue *top, int errcode)
{
lj_func_closeuv(L, top);
switch (errcode) {
case LUA_ERRMEM:
setstrV(L, top, lj_err_str(L, LJ_ERR_ERRMEM));
break;
case LUA_ERRERR:
setstrV(L, top, lj_err_str(L, LJ_ERR_ERRERR));
break;
case LUA_ERRSYNTAX:
case LUA_ERRRUN:
copyTV(L, top, L->top - 1);
break;
default:
lua_assert(0);
break;
}
L->top = top+1;
lj_state_relimitstack(L);
}
/* Throw error. Find catch frame, unwind stack and continue. */
LJ_NOINLINE void lj_err_throw(lua_State *L, int errcode)
{
TValue *frame = L->base-1;
void *cf = L->cframe;
global_State *g = G(L);
if (L->status == LUA_ERRERR+1) { /* Don't touch the stack during lua_open. */
lj_vm_unwind_c(cf, errcode);
goto uncaught; /* unreachable */
}
lj_trace_abort(g);
setgcrefnull(g->jit_L);
L->status = 0;
while (cf) {
if (cframe_nres(cframe_raw(cf)) < 0) { /* cframe without frame? */
TValue *top = restorestack(L, -cframe_nres(cf));
if (frame < top) {
L->cframe = cframe_prev(cf);
L->base = frame+1;
unwindstack(L, top, errcode);
lj_vm_unwind_c(cf, errcode);
goto uncaught; /* unreachable */
}
}
if (frame <= L->stack)
break;
switch (frame_typep(frame)) {
case FRAME_LUA:
case FRAME_LUAP:
frame = frame_prevl(frame);
break;
case FRAME_C:
if (cframe_canyield(cf)) goto uncaught;
cf = cframe_prev(cf);
/* fallthrough */
case FRAME_CONT:
case FRAME_VARG:
frame = frame_prevd(frame);
break;
case FRAME_CP:
L->cframe = cframe_prev(cf);
L->base = frame_prevd(frame) + 1;
unwindstack(L, frame, errcode);
lj_vm_unwind_c(cf, errcode);
goto uncaught; /* unreachable */
case FRAME_PCALL:
hook_leave(g);
/* fallthrough */
case FRAME_PCALLH:
L->cframe = cf;
L->base = frame_prevd(frame) + 1;
unwindstack(L, L->base, errcode);
lj_vm_unwind_ff(cf);
goto uncaught; /* unreachable */
default:
lua_assert(0);
goto uncaught;
}
}
/* No catch frame found. Must be a resume or an unprotected error. */
uncaught:
L->status = cast_byte(errcode);
L->cframe = NULL;
if (cframe_canyield(cf)) { /* Resume? */
unwindstack(L, L->top, errcode);
lj_vm_unwind_c(cf, errcode);
}
/* Better rethrow on main thread than panic. */
{
if (L != mainthread(g))
lj_err_throw(mainthread(g), errcode);
if (g->panic) {
L->base = L->stack+1;
unwindstack(L, L->base, errcode);
g->panic(L);
}
}
exit(EXIT_FAILURE);
}
/* Find error function for runtime errors. Requires an extra stack traversal. */
static ptrdiff_t finderrfunc(lua_State *L)
{
TValue *frame = L->base-1;
void *cf = L->cframe;
while (frame > L->stack) {
lua_assert(cf != NULL);
while (cframe_nres(cframe_raw(cf)) < 0) { /* cframe without frame? */
if (frame >= restorestack(L, -cframe_nres(cf)))
break;
if (cframe_errfunc(cf) >= 0) /* Error handler not inherited (-1)? */
return cframe_errfunc(cf);
cf = cframe_prev(cf); /* Else unwind cframe and continue searching. */
if (cf == NULL)
return 0;
}
switch (frame_typep(frame)) {
case FRAME_LUA:
case FRAME_LUAP:
frame = frame_prevl(frame);
break;
case FRAME_C:
if (cframe_canyield(cf)) return 0;
cf = cframe_prev(cf);
/* fallthrough */
case FRAME_CONT:
case FRAME_VARG:
frame = frame_prevd(frame);
break;
case FRAME_CP:
if (cframe_errfunc(cf) >= 0)
return cframe_errfunc(cf);
frame = frame_prevd(frame);
break;
case FRAME_PCALL:
case FRAME_PCALLH:
if (frame_ftsz(frame) >= (ptrdiff_t)(2*sizeof(TValue))) /* xpcall? */
return savestack(L, frame-1); /* Point to xpcall's errorfunc. */
return 0;
default:
lua_assert(0);
return 0;
}
}
return 0;
}
/* Runtime error. */
LJ_NOINLINE void lj_err_run(lua_State *L)
{
ptrdiff_t ef = finderrfunc(L);
if (ef) {
TValue *errfunc = restorestack(L, ef);
TValue *top = L->top;
lj_trace_abort(G(L));
if (!tvisfunc(errfunc) || L->status == LUA_ERRERR)
lj_err_throw(L, LUA_ERRERR);
L->status = LUA_ERRERR;
copyTV(L, top, top-1);
copyTV(L, top-1, errfunc);
L->top = top+1;
lj_vm_call(L, top, 1+1); /* Stack: |errfunc|msg| -> |msg| */
}
lj_err_throw(L, LUA_ERRRUN);
}
/* Add location to error message. */
LJ_NOINLINE static void err_loc(lua_State *L, const char *msg,
cTValue *frame, cTValue *nextframe)
{
if (frame) {
GCfunc *fn = frame_func(frame);
if (isluafunc(fn)) {
char buff[LUA_IDSIZE];
BCLine line = currentline(L, fn, nextframe);
err_chunkid(buff, strdata(funcproto(fn)->chunkname));
lj_str_pushf(L, "%s:%d: %s", buff, line, msg);
return;
}
}
lj_str_pushf(L, "%s", msg);
}
/* Formatted runtime error message. */
LJ_NORET LJ_NOINLINE static void err_msgv(lua_State *L, ErrMsg em, ...)
{
const char *msg;
va_list argp;
va_start(argp, em);
if (curr_funcisL(L)) L->top = curr_topL(L);
msg = lj_str_pushvf(L, err2msg(em), argp);
va_end(argp);
err_loc(L, msg, L->base-1, NULL);
lj_err_run(L);
}
/* Non-vararg variant for better calling conventions. */
LJ_NOINLINE void lj_err_msg(lua_State *L, ErrMsg em)
{
err_msgv(L, em);
}
/* Lexer error. */
LJ_NOINLINE void lj_err_lex(lua_State *L, const char *src, const char *tok,
BCLine line, ErrMsg em, va_list argp)
{
char buff[LUA_IDSIZE];
const char *msg;
err_chunkid(buff, src);
msg = lj_str_pushvf(L, err2msg(em), argp);
msg = lj_str_pushf(L, "%s:%d: %s", buff, line, msg);
if (tok)
lj_str_pushf(L, err2msg(LJ_ERR_XNEAR), msg, tok);
lj_err_throw(L, LUA_ERRSYNTAX);
}
/* Typecheck error for operands. */
LJ_NOINLINE void lj_err_optype(lua_State *L, cTValue *o, ErrMsg opm)
{
const char *tname = typename(o);
const char *oname = NULL;
const char *opname = err2msg(opm);
if (curr_funcisL(L)) {
GCproto *pt = curr_proto(L);
const BCIns *pc = cframe_Lpc(L) - 1;
const char *kind = getobjname(pt, pc, (BCReg)(o - L->base), &oname);
if (kind)
err_msgv(L, LJ_ERR_BADOPRT, opname, kind, oname, tname);
}
err_msgv(L, LJ_ERR_BADOPRV, opname, tname);
}
/* Typecheck error for ordered comparisons. */
LJ_NOINLINE void lj_err_comp(lua_State *L, cTValue *o1, cTValue *o2)
{
const char *t1 = typename(o1);
const char *t2 = typename(o2);
err_msgv(L, t1 == t2 ? LJ_ERR_BADCMPV : LJ_ERR_BADCMPT, t1, t2);
/* This assumes the two "boolean" entries are commoned by the C compiler. */
}
/* Typecheck error for __call. */
LJ_NOINLINE void lj_err_optype_call(lua_State *L, TValue *o)
{
/* Gross hack if lua_[p]call or pcall/xpcall fail for a non-callable object:
** L->base still points to the caller. So add a dummy frame with L instead
** of a function. See lua_getstack().
*/
const BCIns *pc = cframe_Lpc(L);
if (((ptrdiff_t)pc & FRAME_TYPE) != FRAME_LUA) {
const char *tname = typename(o);
setframe_pc(o, pc);
setframe_gc(o, obj2gco(L));
L->top = L->base = o+1;
err_msgv(L, LJ_ERR_BADCALL, tname);
}
lj_err_optype(L, o, LJ_ERR_OPCALL);
}
/* Error in context of caller. */
LJ_NOINLINE void lj_err_callermsg(lua_State *L, const char *msg)
{
cTValue *frame = L->base-1;
cTValue *pframe = frame_islua(frame) ? frame_prevl(frame) : NULL;
err_loc(L, msg, pframe, frame);
lj_err_run(L);
}
/* Formatted error in context of caller. */
LJ_NOINLINE void lj_err_callerv(lua_State *L, ErrMsg em, ...)
{
const char *msg;
va_list argp;
va_start(argp, em);
msg = lj_str_pushvf(L, err2msg(em), argp);
va_end(argp);
lj_err_callermsg(L, msg);
}
/* Error in context of caller. */
LJ_NOINLINE void lj_err_caller(lua_State *L, ErrMsg em)
{
lj_err_callermsg(L, err2msg(em));
}
/* Argument error message. */
LJ_NORET LJ_NOINLINE static void err_argmsg(lua_State *L, int narg,
const char *msg)
{
const char *fname = "?";
const char *ftype = getfuncname(L, L->base - 1, &fname);
if (ftype && ftype[3] == 'h' && --narg == 0) /* Check for "method". */
msg = lj_str_pushf(L, err2msg(LJ_ERR_BADSELF), fname, msg);
else
msg = lj_str_pushf(L, err2msg(LJ_ERR_BADARG), narg, fname, msg);
lj_err_callermsg(L, msg);
}
/* Formatted argument error. */
LJ_NOINLINE void lj_err_argv(lua_State *L, int narg, ErrMsg em, ...)
{
const char *msg;
va_list argp;
va_start(argp, em);
msg = lj_str_pushvf(L, err2msg(em), argp);
va_end(argp);
err_argmsg(L, narg, msg);
}
/* Argument error. */
LJ_NOINLINE void lj_err_arg(lua_State *L, int narg, ErrMsg em)
{
err_argmsg(L, narg, err2msg(em));
}
/* Typecheck error for arguments. */
LJ_NOINLINE void lj_err_argtype(lua_State *L, int narg, const char *xname)
{
TValue *o = L->base + narg-1;
const char *tname = o < L->top ? typename(o) : lj_obj_typename[0];
const char *msg = lj_str_pushf(L, err2msg(LJ_ERR_BADTYPE), xname, tname);
err_argmsg(L, narg, msg);
}
/* Typecheck error for arguments. */
LJ_NOINLINE void lj_err_argt(lua_State *L, int narg, int tt)
{
lj_err_argtype(L, narg, lj_obj_typename[tt+1]);
}
/* -- Public error handling API ------------------------------------------- */
LUA_API lua_CFunction lua_atpanic(lua_State *L, lua_CFunction panicf)
{
lua_CFunction old = G(L)->panic;
G(L)->panic = panicf;
return old;
}
/* Forwarders for the public API (C calling convention and no LJ_NORET). */
LUA_API int lua_error(lua_State *L)
{
lj_err_run(L);
return 0; /* unreachable */
}
LUALIB_API int luaL_argerror(lua_State *L, int narg, const char *msg)
{
err_argmsg(L, narg, msg);
return 0; /* unreachable */
}
LUALIB_API int luaL_typerror(lua_State *L, int narg, const char *xname)
{
lj_err_argtype(L, narg, xname);
return 0; /* unreachable */
}
LUALIB_API void luaL_where(lua_State *L, int level)
{
int size;
cTValue *frame = lj_err_getframe(L, level, &size);
err_loc(L, "", frame, size ? frame+size : NULL);
}
LUALIB_API int luaL_error(lua_State *L, const char *fmt, ...)
{
const char *msg;
va_list argp;
va_start(argp, fmt);
msg = lj_str_pushvf(L, fmt, argp);
va_end(argp);
lj_err_callermsg(L, msg);
return 0; /* unreachable */
}
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