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Aegisub/subprojects/luajit/src/lj_debug.c

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/*
** Debugging and introspection.
** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
*/
#define lj_debug_c
#define LUA_CORE
#include "lj_obj.h"
#include "lj_err.h"
#include "lj_debug.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_state.h"
#include "lj_frame.h"
#include "lj_bc.h"
#include "lj_vm.h"
#if LJ_HASJIT
#include "lj_jit.h"
#endif
/* -- Frames -------------------------------------------------------------- */
/* Get frame corresponding to a level. */
cTValue *lj_debug_frame(lua_State *L, int level, int *size)
{
cTValue *frame, *nextframe, *bot = tvref(L->stack);
/* Traverse frames backwards. */
for (nextframe = frame = L->base-1; frame > bot; ) {
if (frame_gc(frame) == obj2gco(L))
level++; /* Skip dummy frames. See lj_meta_call(). */
if (level-- == 0) {
*size = (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. */
}
/* Invalid bytecode position. */
#define NO_BCPOS (~(BCPos)0)
/* Return bytecode position for function/frame or NO_BCPOS. */
static BCPos debug_framepc(lua_State *L, GCfunc *fn, cTValue *nextframe)
{
const BCIns *ins;
GCproto *pt;
BCPos pos;
lua_assert(fn->c.gct == ~LJ_TFUNC || fn->c.gct == ~LJ_TTHREAD);
if (!isluafunc(fn)) { /* Cannot derive a PC for non-Lua functions. */
return NO_BCPOS;
} else if (nextframe == NULL) { /* Lua function on top. */
void *cf = cframe_raw(L->cframe);
if (cf == NULL || (char *)cframe_pc(cf) == (char *)cframe_L(cf))
return NO_BCPOS;
ins = cframe_pc(cf); /* 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;
for (;;) {
if (cf == NULL)
return NO_BCPOS;
while (cframe_nres(cf) < 0) {
if (f >= restorestack(L, -cframe_nres(cf)))
break;
cf = cframe_raw(cframe_prev(cf));
if (cf == NULL)
return NO_BCPOS;
}
if (f < nextframe)
break;
if (frame_islua(f)) {
f = frame_prevl(f);
} else {
if (frame_isc(f) || (LJ_HASFFI && frame_iscont(f) &&
(f-1)->u32.lo == LJ_CONT_FFI_CALLBACK))
cf = cframe_raw(cframe_prev(cf));
f = frame_prevd(f);
}
}
ins = cframe_pc(cf);
}
}
pt = funcproto(fn);
pos = proto_bcpos(pt, ins) - 1;
#if LJ_HASJIT
if (pos > pt->sizebc) { /* Undo the effects of lj_trace_exit for JLOOP. */
GCtrace *T = (GCtrace *)((char *)(ins-1) - offsetof(GCtrace, startins));
lua_assert(bc_isret(bc_op(ins[-1])));
pos = proto_bcpos(pt, mref(T->startpc, const BCIns));
}
#endif
return pos;
}
/* -- Line numbers -------------------------------------------------------- */
/* Get line number for a bytecode position. */
BCLine LJ_FASTCALL lj_debug_line(GCproto *pt, BCPos pc)
{
const void *lineinfo = proto_lineinfo(pt);
if (pc <= pt->sizebc && lineinfo) {
BCLine first = pt->firstline;
if (pc == pt->sizebc) return first + pt->numline;
if (pc-- == 0) return first;
if (pt->numline < 256)
return first + (BCLine)((const uint8_t *)lineinfo)[pc];
else if (pt->numline < 65536)
return first + (BCLine)((const uint16_t *)lineinfo)[pc];
else
return first + (BCLine)((const uint32_t *)lineinfo)[pc];
}
return 0;
}
/* Get line number for function/frame. */
static BCLine debug_frameline(lua_State *L, GCfunc *fn, cTValue *nextframe)
{
BCPos pc = debug_framepc(L, fn, nextframe);
if (pc != NO_BCPOS) {
GCproto *pt = funcproto(fn);
lua_assert(pc <= pt->sizebc);
return lj_debug_line(pt, pc);
}
return -1;
}
/* -- Variable names ------------------------------------------------------ */
/* Read ULEB128 value. */
static uint32_t debug_read_uleb128(const uint8_t **pp)
{
const uint8_t *p = *pp;
uint32_t v = *p++;
if (LJ_UNLIKELY(v >= 0x80)) {
int sh = 0;
v &= 0x7f;
do { v |= ((*p & 0x7f) << (sh += 7)); } while (*p++ >= 0x80);
}
*pp = p;
return v;
}
/* Get name of a local variable from slot number and PC. */
static const char *debug_varname(const GCproto *pt, BCPos pc, BCReg slot)
{
const uint8_t *p = proto_varinfo(pt);
if (p) {
BCPos lastpc = 0;
for (;;) {
const char *name = (const char *)p;
uint32_t vn = *p++;
BCPos startpc, endpc;
if (vn < VARNAME__MAX) {
if (vn == VARNAME_END) break; /* End of varinfo. */
} else {
while (*p++) ; /* Skip over variable name string. */
}
lastpc = startpc = lastpc + debug_read_uleb128(&p);
if (startpc > pc) break;
endpc = startpc + debug_read_uleb128(&p);
if (pc < endpc && slot-- == 0) {
if (vn < VARNAME__MAX) {
#define VARNAMESTR(name, str) str "\0"
name = VARNAMEDEF(VARNAMESTR);
#undef VARNAMESTR
if (--vn) while (*name++ || --vn) ;
}
return name;
}
}
}
return NULL;
}
/* Get name of local variable from 1-based slot number and function/frame. */
static TValue *debug_localname(lua_State *L, const lua_Debug *ar,
const char **name, BCReg slot1)
{
uint32_t offset = (uint32_t)ar->i_ci & 0xffff;
uint32_t size = (uint32_t)ar->i_ci >> 16;
TValue *frame = tvref(L->stack) + offset;
TValue *nextframe = size ? frame + size : NULL;
GCfunc *fn = frame_func(frame);
BCPos pc = debug_framepc(L, fn, nextframe);
if (!nextframe) nextframe = L->top;
if ((int)slot1 < 0) { /* Negative slot number is for varargs. */
if (pc != NO_BCPOS) {
GCproto *pt = funcproto(fn);
if ((pt->flags & PROTO_VARARG)) {
slot1 = pt->numparams + (BCReg)(-(int)slot1);
if (frame_isvarg(frame)) { /* Vararg frame has been set up? (pc!=0) */
nextframe = frame;
frame = frame_prevd(frame);
}
if (frame + slot1 < nextframe) {
*name = "(*vararg)";
return frame+slot1;
}
}
}
return NULL;
}
if (pc != NO_BCPOS &&
(*name = debug_varname(funcproto(fn), pc, slot1-1)) != NULL)
;
else if (slot1 > 0 && frame + slot1 < nextframe)
*name = "(*temporary)";
return frame+slot1;
}
/* Get name of upvalue. */
const char *lj_debug_uvname(GCproto *pt, uint32_t idx)
{
const uint8_t *p = proto_uvinfo(pt);
lua_assert(idx < pt->sizeuv);
if (!p) return "";
if (idx) while (*p++ || --idx) ;
return (const char *)p;
}
/* Get name and value of upvalue. */
const char *lj_debug_uvnamev(cTValue *o, uint32_t idx, TValue **tvp)
{
if (tvisfunc(o)) {
GCfunc *fn = funcV(o);
if (isluafunc(fn)) {
GCproto *pt = funcproto(fn);
if (idx < pt->sizeuv) {
*tvp = uvval(&gcref(fn->l.uvptr[idx])->uv);
return lj_debug_uvname(pt, idx);
}
} else {
if (idx < fn->c.nupvalues) {
*tvp = &fn->c.upvalue[idx];
return "";
}
}
}
return NULL;
}
/* Deduce name of an object from slot number and PC. */
const char *lj_debug_slotname(GCproto *pt, const BCIns *ip, BCReg slot,
const char **name)
{
const char *lname;
restart:
lname = debug_varname(pt, proto_bcpos(pt, ip), slot);
if (lname != NULL) { *name = lname; return "local"; }
while (--ip > proto_bc(pt)) {
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(proto_kgc(pt, ~(ptrdiff_t)bc_d(ins))));
return "global";
case BC_TGETS:
*name = strdata(gco2str(proto_kgc(pt, ~(ptrdiff_t)bc_c(ins))));
if (ip > proto_bc(pt)) {
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 = lj_debug_uvname(pt, bc_d(ins));
return "upvalue";
default:
return NULL;
}
}
}
return NULL;
}
/* Deduce function name from caller of a frame. */
const char *lj_debug_funcname(lua_State *L, TValue *frame, const char **name)
{
TValue *pframe;
GCfunc *fn;
BCPos pc;
if (frame <= tvref(L->stack))
return NULL;
if (frame_isvarg(frame))
frame = frame_prevd(frame);
pframe = frame_prev(frame);
fn = frame_func(pframe);
pc = debug_framepc(L, fn, frame);
if (pc != NO_BCPOS) {
GCproto *pt = funcproto(fn);
const BCIns *ip = &proto_bc(pt)[check_exp(pc < pt->sizebc, pc)];
MMS mm = bcmode_mm(bc_op(*ip));
if (mm == MM_call) {
BCReg slot = bc_a(*ip);
if (bc_op(*ip) == BC_ITERC) slot -= 3;
return lj_debug_slotname(pt, ip, slot, name);
} else if (mm != MM__MAX) {
*name = strdata(mmname_str(G(L), mm));
return "metamethod";
}
}
return NULL;
}
/* -- Source code locations ----------------------------------------------- */
/* Generate shortened source name. */
void lj_debug_shortname(char *out, GCstr *str)
{
const char *src = strdata(str);
if (*src == '=') {
strncpy(out, src+1, LUA_IDSIZE); /* Remove first char. */
out[LUA_IDSIZE-1] = '\0'; /* Ensures null termination. */
} else if (*src == '@') { /* Output "source", or "...source". */
size_t len = str->len-1;
src++; /* Skip the `@' */
if (len >= LUA_IDSIZE) {
src += len-(LUA_IDSIZE-4); /* Get last part of file name. */
*out++ = '.'; *out++ = '.'; *out++ = '.';
}
strcpy(out, src);
} else { /* Output [string "string"]. */
size_t len; /* Length, up to first control char. */
for (len = 0; len < LUA_IDSIZE-12; 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, "\"]");
}
}
/* Add current location of a frame to error message. */
void lj_debug_addloc(lua_State *L, const char *msg,
cTValue *frame, cTValue *nextframe)
{
if (frame) {
GCfunc *fn = frame_func(frame);
if (isluafunc(fn)) {
BCLine line = debug_frameline(L, fn, nextframe);
if (line >= 0) {
char buf[LUA_IDSIZE];
lj_debug_shortname(buf, proto_chunkname(funcproto(fn)));
lj_str_pushf(L, "%s:%d: %s", buf, line, msg);
return;
}
}
}
lj_str_pushf(L, "%s", msg);
}
/* Push location string for a bytecode position to Lua stack. */
void lj_debug_pushloc(lua_State *L, GCproto *pt, BCPos pc)
{
GCstr *name = proto_chunkname(pt);
const char *s = strdata(name);
MSize i, len = name->len;
BCLine line = lj_debug_line(pt, pc);
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);
}
}
/* -- Public debug API ---------------------------------------------------- */
/* lua_getupvalue() and lua_setupvalue() are in lj_api.c. */
LUA_API const char *lua_getlocal(lua_State *L, const lua_Debug *ar, int n)
{
const char *name = NULL;
if (ar) {
TValue *o = debug_localname(L, ar, &name, (BCReg)n);
if (name) {
copyTV(L, L->top, o);
incr_top(L);
}
} else if (tvisfunc(L->top-1) && isluafunc(funcV(L->top-1))) {
name = debug_varname(funcproto(funcV(L->top-1)), 0, (BCReg)n-1);
}
return name;
}
LUA_API const char *lua_setlocal(lua_State *L, const lua_Debug *ar, int n)
{
const char *name = NULL;
TValue *o = debug_localname(L, ar, &name, (BCReg)n);
if (name)
copyTV(L, o, L->top-1);
L->top--;
return name;
}
int lj_debug_getinfo(lua_State *L, const char *what, lj_Debug *ar, int ext)
{
int opt_f = 0, opt_L = 0;
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 = tvref(L->stack) + offset;
if (size) nextframe = frame + size;
lua_assert(frame <= tvref(L->maxstack) &&
(!nextframe || nextframe <= tvref(L->maxstack)));
fn = frame_func(frame);
lua_assert(fn->c.gct == ~LJ_TFUNC);
}
for (; *what; what++) {
if (*what == 'S') {
if (isluafunc(fn)) {
GCproto *pt = funcproto(fn);
BCLine firstline = pt->firstline;
GCstr *name = proto_chunkname(pt);
ar->source = strdata(name);
lj_debug_shortname(ar->short_src, name);
ar->linedefined = (int)firstline;
ar->lastlinedefined = (int)(firstline + pt->numline);
ar->what = (firstline || !pt->numline) ? "Lua" : "main";
} else {
ar->source = "=[C]";
ar->short_src[0] = '[';
ar->short_src[1] = 'C';
ar->short_src[2] = ']';
ar->short_src[3] = '\0';
ar->linedefined = -1;
ar->lastlinedefined = -1;
ar->what = "C";
}
} else if (*what == 'l') {
ar->currentline = frame ? debug_frameline(L, fn, nextframe) : -1;
} else if (*what == 'u') {
ar->nups = fn->c.nupvalues;
if (ext) {
if (isluafunc(fn)) {
GCproto *pt = funcproto(fn);
ar->nparams = pt->numparams;
ar->isvararg = !!(pt->flags & PROTO_VARARG);
} else {
ar->nparams = 0;
ar->isvararg = 1;
}
}
} else if (*what == 'n') {
ar->namewhat = frame ? lj_debug_funcname(L, frame, &ar->name) : NULL;
if (ar->namewhat == NULL) {
ar->namewhat = "";
ar->name = NULL;
}
} else if (*what == 'f') {
opt_f = 1;
} else if (*what == 'L') {
opt_L = 1;
} else {
return 0; /* Bad option. */
}
}
if (opt_f) {
setfuncV(L, L->top, fn);
incr_top(L);
}
if (opt_L) {
if (isluafunc(fn)) {
GCtab *t = lj_tab_new(L, 0, 0);
GCproto *pt = funcproto(fn);
const void *lineinfo = proto_lineinfo(pt);
if (lineinfo) {
BCLine first = pt->firstline;
int sz = pt->numline < 256 ? 1 : pt->numline < 65536 ? 2 : 4;
MSize i, szl = pt->sizebc-1;
for (i = 0; i < szl; i++) {
BCLine line = first +
(sz == 1 ? (BCLine)((const uint8_t *)lineinfo)[i] :
sz == 2 ? (BCLine)((const uint16_t *)lineinfo)[i] :
(BCLine)((const uint32_t *)lineinfo)[i]);
setboolV(lj_tab_setint(L, t, line), 1);
}
}
settabV(L, L->top, t);
} else {
setnilV(L->top);
}
incr_top(L);
}
return 1; /* Ok. */
}
LUA_API int lua_getinfo(lua_State *L, const char *what, lua_Debug *ar)
{
return lj_debug_getinfo(L, what, (lj_Debug *)ar, 0);
}
LUA_API int lua_getstack(lua_State *L, int level, lua_Debug *ar)
{
int size;
cTValue *frame = lj_debug_frame(L, level, &size);
if (frame) {
ar->i_ci = (size << 16) + (int)(frame - tvref(L->stack));
return 1;
} else {
ar->i_ci = level - size;
return 0;
}
}
/* Number of frames for the leading and trailing part of a traceback. */
#define TRACEBACK_LEVELS1 12
#define TRACEBACK_LEVELS2 10
LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1, const char *msg,
int level)
{
int top = (int)(L->top - L->base);
int lim = TRACEBACK_LEVELS1;
lua_Debug ar;
if (msg) lua_pushfstring(L, "%s\n", msg);
lua_pushliteral(L, "stack traceback:");
while (lua_getstack(L1, level++, &ar)) {
GCfunc *fn;
if (level > lim) {
if (!lua_getstack(L1, level + TRACEBACK_LEVELS2, &ar)) {
level--;
} else {
lua_pushliteral(L, "\n\t...");
lua_getstack(L1, -10, &ar);
level = ar.i_ci - TRACEBACK_LEVELS2;
}
lim = 2147483647;
continue;
}
lua_getinfo(L1, "Snlf", &ar);
fn = funcV(L1->top-1); L1->top--;
if (isffunc(fn) && !*ar.namewhat)
lua_pushfstring(L, "\n\t[builtin#%d]:", fn->c.ffid);
else
lua_pushfstring(L, "\n\t%s:", ar.short_src);
if (ar.currentline > 0)
lua_pushfstring(L, "%d:", ar.currentline);
if (*ar.namewhat) {
lua_pushfstring(L, " in function " LUA_QS, ar.name);
} else {
if (*ar.what == 'm') {
lua_pushliteral(L, " in main chunk");
} else if (*ar.what == 'C') {
lua_pushfstring(L, " at %p", fn->c.f);
} else {
lua_pushfstring(L, " in function <%s:%d>",
ar.short_src, ar.linedefined);
}
}
if ((int)(L->top - L->base) - top >= 15)
lua_concat(L, (int)(L->top - L->base) - top);
}
lua_concat(L, (int)(L->top - L->base) - top);
}
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