700 lines
20 KiB
C
700 lines
20 KiB
C
/*
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** $Id: ldebug.c,v 2.121.1.2 2017/07/10 17:21:50 roberto Exp $
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** Debug Interface
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** See Copyright Notice in lua.h
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*/
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#define ldebug_c
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#define LUA_CORE
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#include "lprefix.h"
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#include <stdarg.h>
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#include <stddef.h>
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#include <string.h>
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#include "lua.h"
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#include "lapi.h"
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#include "lcode.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lfunc.h"
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#include "lobject.h"
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#include "lopcodes.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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#include "lvm.h"
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#define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_TCCL)
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/* Active Lua function (given call info) */
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#define ci_func(ci) (clLvalue((ci)->func))
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static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
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const char **name);
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static int currentpc (CallInfo *ci) {
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lua_assert(isLua(ci));
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return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
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}
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static int currentline (CallInfo *ci) {
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return getfuncline(ci_func(ci)->p, currentpc(ci));
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}
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/*
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** If function yielded, its 'func' can be in the 'extra' field. The
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** next function restores 'func' to its correct value for debugging
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** purposes. (It exchanges 'func' and 'extra'; so, when called again,
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** after debugging, it also "re-restores" ** 'func' to its altered value.
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*/
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static void swapextra (lua_State *L) {
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if (L->status == LUA_YIELD) {
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CallInfo *ci = L->ci; /* get function that yielded */
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StkId temp = ci->func; /* exchange its 'func' and 'extra' values */
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ci->func = restorestack(L, ci->extra);
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ci->extra = savestack(L, temp);
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}
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}
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/*
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** This function can be called asynchronously (e.g. during a signal).
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** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
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** 'resethookcount') are for debug only, and it is no problem if they
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** get arbitrary values (causes at most one wrong hook call). 'hookmask'
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** is an atomic value. We assume that pointers are atomic too (e.g., gcc
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** ensures that for all platforms where it runs). Moreover, 'hook' is
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** always checked before being called (see 'luaD_hook').
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*/
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LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
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if (func == NULL || mask == 0) { /* turn off hooks? */
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mask = 0;
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func = NULL;
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}
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if (isLua(L->ci))
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L->oldpc = L->ci->u.l.savedpc;
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L->hook = func;
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L->basehookcount = count;
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resethookcount(L);
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L->hookmask = cast_byte(mask);
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}
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LUA_API lua_Hook lua_gethook (lua_State *L) {
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return L->hook;
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}
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LUA_API int lua_gethookmask (lua_State *L) {
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return L->hookmask;
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}
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LUA_API int lua_gethookcount (lua_State *L) {
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return L->basehookcount;
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}
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LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
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int status;
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CallInfo *ci;
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if (level < 0) return 0; /* invalid (negative) level */
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lua_lock(L);
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for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
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level--;
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if (level == 0 && ci != &L->base_ci) { /* level found? */
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status = 1;
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ar->i_ci = ci;
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}
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else status = 0; /* no such level */
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lua_unlock(L);
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return status;
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}
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static const char *upvalname (Proto *p, int uv) {
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TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
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if (s == NULL) return "?";
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else return getstr(s);
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}
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static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
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int nparams = clLvalue(ci->func)->p->numparams;
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if (n >= cast_int(ci->u.l.base - ci->func) - nparams)
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return NULL; /* no such vararg */
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else {
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*pos = ci->func + nparams + n;
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return "(*vararg)"; /* generic name for any vararg */
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}
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}
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static const char *findlocal (lua_State *L, CallInfo *ci, int n,
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StkId *pos) {
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const char *name = NULL;
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StkId base;
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if (isLua(ci)) {
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if (n < 0) /* access to vararg values? */
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return findvararg(ci, -n, pos);
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else {
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base = ci->u.l.base;
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name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
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}
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}
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else
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base = ci->func + 1;
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if (name == NULL) { /* no 'standard' name? */
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StkId limit = (ci == L->ci) ? L->top : ci->next->func;
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if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */
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name = "(*temporary)"; /* generic name for any valid slot */
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else
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return NULL; /* no name */
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}
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*pos = base + (n - 1);
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return name;
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}
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LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
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const char *name;
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lua_lock(L);
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swapextra(L);
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if (ar == NULL) { /* information about non-active function? */
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if (!isLfunction(L->top - 1)) /* not a Lua function? */
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name = NULL;
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else /* consider live variables at function start (parameters) */
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name = luaF_getlocalname(clLvalue(L->top - 1)->p, n, 0);
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}
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else { /* active function; get information through 'ar' */
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StkId pos = NULL; /* to avoid warnings */
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name = findlocal(L, ar->i_ci, n, &pos);
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if (name) {
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setobj2s(L, L->top, pos);
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api_incr_top(L);
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}
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}
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swapextra(L);
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lua_unlock(L);
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return name;
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}
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LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
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StkId pos = NULL; /* to avoid warnings */
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const char *name;
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lua_lock(L);
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swapextra(L);
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name = findlocal(L, ar->i_ci, n, &pos);
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if (name) {
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setobjs2s(L, pos, L->top - 1);
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L->top--; /* pop value */
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}
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swapextra(L);
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lua_unlock(L);
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return name;
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}
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static void funcinfo (lua_Debug *ar, Closure *cl) {
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if (noLuaClosure(cl)) {
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ar->source = "=[C]";
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ar->linedefined = -1;
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ar->lastlinedefined = -1;
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ar->what = "C";
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}
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else {
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Proto *p = cl->l.p;
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ar->source = p->source ? getstr(p->source) : "=?";
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ar->linedefined = p->linedefined;
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ar->lastlinedefined = p->lastlinedefined;
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ar->what = (ar->linedefined == 0) ? "main" : "Lua";
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}
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luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
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}
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static void collectvalidlines (lua_State *L, Closure *f) {
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if (noLuaClosure(f)) {
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setnilvalue(L->top);
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api_incr_top(L);
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}
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else {
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int i;
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TValue v;
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int *lineinfo = f->l.p->lineinfo;
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Table *t = luaH_new(L); /* new table to store active lines */
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sethvalue(L, L->top, t); /* push it on stack */
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api_incr_top(L);
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setbvalue(&v, 1); /* boolean 'true' to be the value of all indices */
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for (i = 0; i < f->l.p->sizelineinfo; i++) /* for all lines with code */
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luaH_setint(L, t, lineinfo[i], &v); /* table[line] = true */
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}
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}
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static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
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if (ci == NULL) /* no 'ci'? */
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return NULL; /* no info */
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else if (ci->callstatus & CIST_FIN) { /* is this a finalizer? */
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*name = "__gc";
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return "metamethod"; /* report it as such */
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}
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/* calling function is a known Lua function? */
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else if (!(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
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return funcnamefromcode(L, ci->previous, name);
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else return NULL; /* no way to find a name */
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}
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static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
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Closure *f, CallInfo *ci) {
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int status = 1;
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for (; *what; what++) {
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switch (*what) {
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case 'S': {
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funcinfo(ar, f);
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break;
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}
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case 'l': {
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ar->currentline = (ci && isLua(ci)) ? currentline(ci) : -1;
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break;
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}
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case 'u': {
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ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
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if (noLuaClosure(f)) {
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ar->isvararg = 1;
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ar->nparams = 0;
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}
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else {
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ar->isvararg = f->l.p->is_vararg;
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ar->nparams = f->l.p->numparams;
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}
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break;
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}
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case 't': {
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ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
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break;
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}
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case 'n': {
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ar->namewhat = getfuncname(L, ci, &ar->name);
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if (ar->namewhat == NULL) {
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ar->namewhat = ""; /* not found */
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ar->name = NULL;
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}
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break;
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}
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case 'L':
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case 'f': /* handled by lua_getinfo */
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break;
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default: status = 0; /* invalid option */
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}
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}
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return status;
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}
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LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
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int status;
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Closure *cl;
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CallInfo *ci;
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StkId func;
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lua_lock(L);
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swapextra(L);
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if (*what == '>') {
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ci = NULL;
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func = L->top - 1;
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api_check(L, ttisfunction(func), "function expected");
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what++; /* skip the '>' */
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L->top--; /* pop function */
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}
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else {
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ci = ar->i_ci;
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func = ci->func;
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lua_assert(ttisfunction(ci->func));
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}
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cl = ttisclosure(func) ? clvalue(func) : NULL;
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status = auxgetinfo(L, what, ar, cl, ci);
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if (strchr(what, 'f')) {
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setobjs2s(L, L->top, func);
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api_incr_top(L);
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}
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swapextra(L); /* correct before option 'L', which can raise a mem. error */
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if (strchr(what, 'L'))
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collectvalidlines(L, cl);
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lua_unlock(L);
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return status;
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}
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/*
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** {======================================================
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** Symbolic Execution
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** =======================================================
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*/
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static const char *getobjname (Proto *p, int lastpc, int reg,
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const char **name);
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/*
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** find a "name" for the RK value 'c'
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*/
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static void kname (Proto *p, int pc, int c, const char **name) {
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if (ISK(c)) { /* is 'c' a constant? */
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TValue *kvalue = &p->k[INDEXK(c)];
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if (ttisstring(kvalue)) { /* literal constant? */
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*name = svalue(kvalue); /* it is its own name */
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return;
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}
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/* else no reasonable name found */
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}
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else { /* 'c' is a register */
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const char *what = getobjname(p, pc, c, name); /* search for 'c' */
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if (what && *what == 'c') { /* found a constant name? */
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return; /* 'name' already filled */
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}
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/* else no reasonable name found */
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}
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*name = "?"; /* no reasonable name found */
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}
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static int filterpc (int pc, int jmptarget) {
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if (pc < jmptarget) /* is code conditional (inside a jump)? */
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return -1; /* cannot know who sets that register */
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else return pc; /* current position sets that register */
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}
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/*
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** try to find last instruction before 'lastpc' that modified register 'reg'
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*/
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static int findsetreg (Proto *p, int lastpc, int reg) {
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int pc;
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int setreg = -1; /* keep last instruction that changed 'reg' */
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int jmptarget = 0; /* any code before this address is conditional */
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for (pc = 0; pc < lastpc; pc++) {
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Instruction i = p->code[pc];
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OpCode op = GET_OPCODE(i);
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int a = GETARG_A(i);
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switch (op) {
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case OP_LOADNIL: {
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int b = GETARG_B(i);
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if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */
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setreg = filterpc(pc, jmptarget);
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break;
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}
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case OP_TFORCALL: {
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if (reg >= a + 2) /* affect all regs above its base */
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setreg = filterpc(pc, jmptarget);
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break;
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}
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case OP_CALL:
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case OP_TAILCALL: {
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if (reg >= a) /* affect all registers above base */
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setreg = filterpc(pc, jmptarget);
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break;
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}
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case OP_JMP: {
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int b = GETARG_sBx(i);
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int dest = pc + 1 + b;
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/* jump is forward and do not skip 'lastpc'? */
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if (pc < dest && dest <= lastpc) {
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if (dest > jmptarget)
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jmptarget = dest; /* update 'jmptarget' */
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}
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break;
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}
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default:
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if (testAMode(op) && reg == a) /* any instruction that set A */
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setreg = filterpc(pc, jmptarget);
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break;
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}
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}
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return setreg;
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}
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static const char *getobjname (Proto *p, int lastpc, int reg,
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const char **name) {
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int pc;
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*name = luaF_getlocalname(p, reg + 1, lastpc);
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if (*name) /* is a local? */
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return "local";
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/* else try symbolic execution */
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pc = findsetreg(p, lastpc, reg);
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if (pc != -1) { /* could find instruction? */
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Instruction i = p->code[pc];
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OpCode op = GET_OPCODE(i);
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switch (op) {
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case OP_MOVE: {
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int b = GETARG_B(i); /* move from 'b' to 'a' */
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if (b < GETARG_A(i))
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return getobjname(p, pc, b, name); /* get name for 'b' */
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break;
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}
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case OP_GETTABUP:
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case OP_GETTABLE: {
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int k = GETARG_C(i); /* key index */
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int t = GETARG_B(i); /* table index */
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const char *vn = (op == OP_GETTABLE) /* name of indexed variable */
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? luaF_getlocalname(p, t + 1, pc)
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: upvalname(p, t);
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kname(p, pc, k, name);
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return (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field";
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}
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case OP_GETUPVAL: {
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*name = upvalname(p, GETARG_B(i));
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return "upvalue";
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}
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case OP_LOADK:
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case OP_LOADKX: {
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int b = (op == OP_LOADK) ? GETARG_Bx(i)
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: GETARG_Ax(p->code[pc + 1]);
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if (ttisstring(&p->k[b])) {
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*name = svalue(&p->k[b]);
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return "constant";
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}
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break;
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}
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case OP_SELF: {
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int k = GETARG_C(i); /* key index */
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kname(p, pc, k, name);
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return "method";
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}
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default: break; /* go through to return NULL */
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}
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}
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return NULL; /* could not find reasonable name */
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}
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/*
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** Try to find a name for a function based on the code that called it.
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** (Only works when function was called by a Lua function.)
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** Returns what the name is (e.g., "for iterator", "method",
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** "metamethod") and sets '*name' to point to the name.
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*/
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static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
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const char **name) {
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TMS tm = (TMS)0; /* (initial value avoids warnings) */
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Proto *p = ci_func(ci)->p; /* calling function */
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int pc = currentpc(ci); /* calling instruction index */
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Instruction i = p->code[pc]; /* calling instruction */
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if (ci->callstatus & CIST_HOOKED) { /* was it called inside a hook? */
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*name = "?";
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return "hook";
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}
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switch (GET_OPCODE(i)) {
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case OP_CALL:
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case OP_TAILCALL:
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return getobjname(p, pc, GETARG_A(i), name); /* get function name */
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case OP_TFORCALL: { /* for iterator */
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*name = "for iterator";
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return "for iterator";
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}
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/* other instructions can do calls through metamethods */
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case OP_SELF: case OP_GETTABUP: case OP_GETTABLE:
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tm = TM_INDEX;
|
|
break;
|
|
case OP_SETTABUP: case OP_SETTABLE:
|
|
tm = TM_NEWINDEX;
|
|
break;
|
|
case OP_ADD: case OP_SUB: case OP_MUL: case OP_MOD:
|
|
case OP_POW: case OP_DIV: case OP_IDIV: case OP_BAND:
|
|
case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR: {
|
|
int offset = cast_int(GET_OPCODE(i)) - cast_int(OP_ADD); /* ORDER OP */
|
|
tm = cast(TMS, offset + cast_int(TM_ADD)); /* ORDER TM */
|
|
break;
|
|
}
|
|
case OP_UNM: tm = TM_UNM; break;
|
|
case OP_BNOT: tm = TM_BNOT; break;
|
|
case OP_LEN: tm = TM_LEN; break;
|
|
case OP_CONCAT: tm = TM_CONCAT; break;
|
|
case OP_EQ: tm = TM_EQ; break;
|
|
case OP_LT: tm = TM_LT; break;
|
|
case OP_LE: tm = TM_LE; break;
|
|
default:
|
|
return NULL; /* cannot find a reasonable name */
|
|
}
|
|
*name = getstr(G(L)->tmname[tm]);
|
|
return "metamethod";
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
/*
|
|
** The subtraction of two potentially unrelated pointers is
|
|
** not ISO C, but it should not crash a program; the subsequent
|
|
** checks are ISO C and ensure a correct result.
|
|
*/
|
|
static int isinstack (CallInfo *ci, const TValue *o) {
|
|
ptrdiff_t i = o - ci->u.l.base;
|
|
return (0 <= i && i < (ci->top - ci->u.l.base) && ci->u.l.base + i == o);
|
|
}
|
|
|
|
|
|
/*
|
|
** Checks whether value 'o' came from an upvalue. (That can only happen
|
|
** with instructions OP_GETTABUP/OP_SETTABUP, which operate directly on
|
|
** upvalues.)
|
|
*/
|
|
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;
|
|
}
|
|
|
|
|
|
static const char *varinfo (lua_State *L, const TValue *o) {
|
|
const char *name = NULL; /* to avoid warnings */
|
|
CallInfo *ci = L->ci;
|
|
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);
|
|
}
|
|
return (kind) ? luaO_pushfstring(L, " (%s '%s')", kind, name) : "";
|
|
}
|
|
|
|
|
|
l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
|
|
const char *t = luaT_objtypename(L, o);
|
|
luaG_runerror(L, "attempt to %s a %s value%s", op, t, varinfo(L, o));
|
|
}
|
|
|
|
|
|
l_noret luaG_concaterror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
if (ttisstring(p1) || cvt2str(p1)) p1 = p2;
|
|
luaG_typeerror(L, p1, "concatenate");
|
|
}
|
|
|
|
|
|
l_noret luaG_opinterror (lua_State *L, const TValue *p1,
|
|
const TValue *p2, const char *msg) {
|
|
lua_Number temp;
|
|
if (!tonumber(p1, &temp)) /* first operand is wrong? */
|
|
p2 = p1; /* now second is wrong */
|
|
luaG_typeerror(L, p2, msg);
|
|
}
|
|
|
|
|
|
/*
|
|
** Error when both values are convertible to numbers, but not to integers
|
|
*/
|
|
l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
lua_Integer temp;
|
|
if (!tointeger(p1, &temp))
|
|
p2 = p1;
|
|
luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
|
|
}
|
|
|
|
|
|
l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
const char *t1 = luaT_objtypename(L, p1);
|
|
const char *t2 = luaT_objtypename(L, p2);
|
|
if (strcmp(t1, t2) == 0)
|
|
luaG_runerror(L, "attempt to compare two %s values", t1);
|
|
else
|
|
luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
|
|
}
|
|
|
|
|
|
/* add src:line information to 'msg' */
|
|
const char *luaG_addinfo (lua_State *L, const char *msg, TString *src,
|
|
int line) {
|
|
char buff[LUA_IDSIZE];
|
|
if (src)
|
|
luaO_chunkid(buff, getstr(src), LUA_IDSIZE);
|
|
else { /* no source available; use "?" instead */
|
|
buff[0] = '?'; buff[1] = '\0';
|
|
}
|
|
return 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);
|
|
setobjs2s(L, L->top, L->top - 1); /* move argument */
|
|
setobjs2s(L, L->top - 1, errfunc); /* push function */
|
|
L->top++; /* assume EXTRA_STACK */
|
|
luaD_callnoyield(L, L->top - 2, 1); /* call it */
|
|
}
|
|
luaD_throw(L, LUA_ERRRUN);
|
|
}
|
|
|
|
|
|
l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
|
|
CallInfo *ci = L->ci;
|
|
const char *msg;
|
|
va_list argp;
|
|
luaC_checkGC(L); /* error message uses memory */
|
|
va_start(argp, fmt);
|
|
msg = luaO_pushvfstring(L, fmt, argp); /* format message */
|
|
va_end(argp);
|
|
if (isLua(ci)) /* if Lua function, add source:line information */
|
|
luaG_addinfo(L, msg, ci_func(ci)->p->source, currentline(ci));
|
|
luaG_errormsg(L);
|
|
}
|
|
|
|
|
|
void luaG_traceexec (lua_State *L) {
|
|
CallInfo *ci = L->ci;
|
|
lu_byte mask = L->hookmask;
|
|
int counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
|
|
if (counthook)
|
|
resethookcount(L); /* reset count */
|
|
else if (!(mask & LUA_MASKLINE))
|
|
return; /* no line hook and count != 0; nothing to be done */
|
|
if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
|
|
ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
|
|
return; /* do not call hook again (VM yielded, so it did not move) */
|
|
}
|
|
if (counthook)
|
|
luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */
|
|
if (mask & LUA_MASKLINE) {
|
|
Proto *p = ci_func(ci)->p;
|
|
int npc = pcRel(ci->u.l.savedpc, p);
|
|
int newline = getfuncline(p, npc);
|
|
if (npc == 0 || /* call linehook when enter a new function, */
|
|
ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
|
|
newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
|
|
luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */
|
|
}
|
|
L->oldpc = ci->u.l.savedpc;
|
|
if (L->status == LUA_YIELD) { /* did hook yield? */
|
|
if (counthook)
|
|
L->hookcount = 1; /* undo decrement to zero */
|
|
ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
|
|
ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
|
|
ci->func = L->top - 1; /* protect stack below results */
|
|
luaD_throw(L, LUA_YIELD);
|
|
}
|
|
}
|
|
|