/* DWARF2 personality handler referenced from interpreter .eh_frame. */
LJ_FUNCA int lj_err_unwind_dwarf(int version, _Unwind_Action actions,
uint64_t uexclass, struct _Unwind_Exception *uex,
struct _Unwind_Context *ctx)
{
void *cf;
lua_State *L;
if (version != 1)
return _URC_FATAL_PHASE1_ERROR;
UNUSED(uexclass);
cf = (void *)_Unwind_GetCFA(ctx);
L = cframe_L(cf);
if ((actions & _UA_SEARCH_PHASE)) {
#if LJ_UNWIND_EXT
if (err_unwind(L, cf, 0) == NULL)
return _URC_CONTINUE_UNWIND;
#endif
if (!LJ_UEXCLASS_CHECK(uexclass)) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
}
return _URC_HANDLER_FOUND;
}
if ((actions & _UA_CLEANUP_PHASE)) {
int errcode;
if (LJ_UEXCLASS_CHECK(uexclass)) {
errcode = LJ_UEXCLASS_ERRCODE(uexclass);
} else {
if ((actions & _UA_HANDLER_FRAME))
_Unwind_DeleteException(uex);
errcode = LUA_ERRRUN;
}
#if LJ_UNWIND_EXT
cf = err_unwind(L, cf, errcode);
if ((actions & _UA_FORCE_UNWIND)) {
return _URC_CONTINUE_UNWIND;
} else if (cf) {
_Unwind_SetGR(ctx, LJ_TARGET_EHRETREG, errcode);
_Unwind_SetIP(ctx, (uintptr_t)(cframe_unwind_ff(cf) ?
lj_vm_unwind_ff_eh :
lj_vm_unwind_c_eh));
return _URC_INSTALL_CONTEXT;
}
#if LJ_TARGET_X86ORX64
else if ((actions & _UA_HANDLER_FRAME)) {
/* Workaround for ancient libgcc bug. Still present in RHEL 5.5. :-/
** Real fix: http://gcc.gnu.org/viewcvs/trunk/gcc/unwind-dw2.c?r1=121165&r2=124837&pathrev=153877&diff_format=h
*/
_Unwind_SetGR(ctx, LJ_TARGET_EHRETREG, errcode);
_Unwind_SetIP(ctx, (uintptr_t)lj_vm_unwind_rethrow);
return _URC_INSTALL_CONTEXT;
}
#endif
#else
/* This is not the proper way to escape from the unwinder. We get away with
** it on x86/PPC because the interpreter restores all callee-saved regs.
*/
lj_err_throw(L, errcode);
#endif
}
return _URC_CONTINUE_UNWIND;
}
/* Win64 exception handler for interpreter frame. */
LJ_FUNCA EXCEPTION_DISPOSITION lj_err_unwind_win64(EXCEPTION_RECORD *rec,
void *cf, CONTEXT *ctx, UndocumentedDispatcherContext *dispatch)
{
lua_State *L = cframe_L(cf);
int errcode = LJ_EXCODE_CHECK(rec->ExceptionCode) ?
LJ_EXCODE_ERRCODE(rec->ExceptionCode) : LUA_ERRRUN;
if ((rec->ExceptionFlags & 6)) { /* EH_UNWINDING|EH_EXIT_UNWIND */
/* Unwind internal frames. */
err_unwind(L, cf, errcode);
} else {
void *cf2 = err_unwind(L, cf, 0);
if (cf2) { /* We catch it, so start unwinding the upper frames. */
if (rec->ExceptionCode == LJ_MSVC_EXCODE) {
#ifdef _MSC_VER
__DestructExceptionObject(rec, 1);
#endif
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
} else if (!LJ_EXCODE_CHECK(rec->ExceptionCode)) {
/* Don't catch access violations etc. */
return ExceptionContinueSearch;
}
/* Unwind the stack and call all handlers for all lower C frames
** (including ourselves) again with EH_UNWINDING set. Then set
** rsp = cf, rax = errcode and jump to the specified target.
*/
RtlUnwindEx(cf, (void *)((cframe_unwind_ff(cf2) && errcode != LUA_YIELD) ?
lj_vm_unwind_ff_eh :
lj_vm_unwind_c_eh),
rec, (void *)errcode, ctx, dispatch->HistoryTable);
/* RtlUnwindEx should never return. */
}
}
return ExceptionContinueSearch;
}
/* Out-of-memory error. */
LJ_NOINLINE void lj_err_mem(lua_State *L)
{
if (L->status == LUA_ERRERR+1) /* Don't touch the stack during lua_open. */
lj_vm_unwind_c(L->cframe, LUA_ERRMEM);
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRMEM));
lj_err_throw(L, LUA_ERRMEM);
}
/* Setup lexer state. */
void lj_lex_setup(lua_State *L, LexState *ls)
{
ls->L = L;
ls->fs = NULL;
ls->n = 0;
ls->p = NULL;
ls->vstack = NULL;
ls->sizevstack = 0;
ls->vtop = 0;
ls->bcstack = NULL;
ls->sizebcstack = 0;
ls->lookahead = TK_eof; /* No look-ahead token. */
ls->linenumber = 1;
ls->lastline = 1;
lj_str_resizebuf(ls->L, &ls->sb, LJ_MIN_SBUF);
next(ls); /* Read-ahead first char. */
if (ls->current == 0xef && ls->n >= 2 && char2int(ls->p[0]) == 0xbb &&
char2int(ls->p[1]) == 0xbf) { /* Skip UTF-8 BOM (if buffered). */
ls->n -= 2;
ls->p += 2;
next(ls);
}
if (ls->current == '#') { /* Skip POSIX #! header line. */
do {
next(ls);
if (ls->current == END_OF_STREAM) return;
} while (!currIsNewline(ls));
inclinenumber(ls);
}
if (ls->current == LUA_SIGNATURE[0]) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XBCLOAD));
lj_err_throw(L, LUA_ERRSYNTAX);
}
}
/* ARM unwinder personality handler referenced from interpreter .ARM.extab. */
LJ_FUNCA int lj_err_unwind_arm(int state, _Unwind_Control_Block *ucb,
_Unwind_Context *ctx)
{
void *cf = (void *)_Unwind_GetGR(ctx, 13);
lua_State *L = cframe_L(cf);
int errcode;
switch ((state & _US_ACTION_MASK)) {
case _US_VIRTUAL_UNWIND_FRAME:
if ((state & _US_FORCE_UNWIND)) break;
return _URC_HANDLER_FOUND;
case _US_UNWIND_FRAME_STARTING:
if (LJ_UEXCLASS_CHECK(ucb->exclass)) {
errcode = LJ_UEXCLASS_ERRCODE(ucb->exclass);
} else {
errcode = LUA_ERRRUN;
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
}
cf = err_unwind(L, cf, errcode);
if ((state & _US_FORCE_UNWIND) || cf == NULL) break;
_Unwind_SetGR(ctx, 15, (uint32_t)lj_vm_unwind_ext);
_Unwind_SetGR(ctx, 0, (uint32_t)ucb);
_Unwind_SetGR(ctx, 1, (uint32_t)errcode);
_Unwind_SetGR(ctx, 2, cframe_unwind_ff(cf) ?
(uint32_t)lj_vm_unwind_ff_eh :
(uint32_t)lj_vm_unwind_c_eh);
return _URC_INSTALL_CONTEXT;
default:
return _URC_FAILURE;
}
if (__gnu_unwind_frame(ucb, ctx) != _URC_OK)
return _URC_FAILURE;
return _URC_CONTINUE_UNWIND;
}
/* Protection twiddling failed. Probably due to kernel security. */
static LJ_NOINLINE void mcode_protfail(jit_State *J)
{
lua_CFunction panic = J2G(J)->panic;
if (panic) {
lua_State *L = J->L;
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITPROT));
panic(L);
}
}
/* Setup lexer state. */
int lj_lex_setup(lua_State *L, LexState *ls)
{
int header = 0;
ls->L = L;
ls->fs = NULL;
ls->n = 0;
ls->p = NULL;
ls->vstack = NULL;
ls->sizevstack = 0;
ls->vtop = 0;
ls->bcstack = NULL;
ls->sizebcstack = 0;
ls->lookahead = TK_eof; /* No look-ahead token. */
ls->linenumber = 1;
ls->lastline = 1;
lj_str_resizebuf(ls->L, &ls->sb, LJ_MIN_SBUF);
next(ls); /* Read-ahead first char. */
if (ls->current == 0xef && ls->n >= 2 && char2int(ls->p[0]) == 0xbb &&
char2int(ls->p[1]) == 0xbf) { /* Skip UTF-8 BOM (if buffered). */
ls->n -= 2;
ls->p += 2;
next(ls);
header = 1;
}
if (ls->current == '#') { /* Skip POSIX #! header line. */
do {
next(ls);
if (ls->current == END_OF_STREAM) return 0;
} while (!currIsNewline(ls));
inclinenumber(ls);
header = 1;
}
if (ls->current == LUA_SIGNATURE[0]) { /* Bytecode dump. */
if (header) {
/*
** Loading bytecode with an extra header is disabled for security
** reasons. This may circumvent the usual check for bytecode vs.
** Lua code by looking at the first char. Since this is a potential
** security violation no attempt is made to echo the chunkname either.
*/
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_BCBAD));
lj_err_throw(L, LUA_ERRSYNTAX);
}
return 1;
}
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) {
setstrV(L, top-1, lj_err_str(L, LJ_ERR_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);
}
static TValue *cpparser(lua_State *L, lua_CFunction dummy, void *ud)
{
LexState *ls = (LexState *)ud;
GCproto *pt;
GCfunc *fn;
int bc;
UNUSED(dummy);
cframe_errfunc(L->cframe) = -1; /* Inherit error function. */
bc = lj_lex_setup(L, ls);
if (ls->mode && !strchr(ls->mode, bc ? 'b' : 't')) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_XMODE));
lj_err_throw(L, LUA_ERRSYNTAX);
}
pt = bc ? lj_bcread(ls) : lj_parse(ls);
fn = lj_func_newL_empty(L, pt, tabref(L->env));
/* Don't combine above/below into one statement. */
setfuncV(L, L->top++, fn);
return NULL;
}
/* ARM unwinder personality handler referenced from interpreter .ARM.extab. */
LJ_FUNCA int lj_err_unwind_arm(int state, void *ucb, _Unwind_Context *ctx)
{
void *cf = (void *)_Unwind_GetGR(ctx, 13);
lua_State *L = cframe_L(cf);
if ((state & _US_ACTION_MASK) == _US_VIRTUAL_UNWIND_FRAME) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
return _URC_HANDLER_FOUND;
}
if ((state&(_US_ACTION_MASK|_US_FORCE_UNWIND)) == _US_UNWIND_FRAME_STARTING) {
_Unwind_DeleteException(ucb);
_Unwind_SetGR(ctx, 15, (uint32_t)(void *)lj_err_throw);
_Unwind_SetGR(ctx, 0, (uint32_t)L);
_Unwind_SetGR(ctx, 1, (uint32_t)LUA_ERRRUN);
return _URC_INSTALL_CONTEXT;
}
if (__gnu_unwind_frame(ucb, ctx) != _URC_OK)
return _URC_FAILURE;
return _URC_CONTINUE_UNWIND;
}
