mirror of
https://github.com/lua/lua
synced 2024-11-23 13:19:57 +03:00
568 lines
14 KiB
C
568 lines
14 KiB
C
/*
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** $Id: ldebug.c,v 1.88 2001/09/07 17:39:10 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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#include <stdlib.h>
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#define LUA_PRIVATE
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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 "luadebug.h"
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#include "lvm.h"
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static const l_char *getfuncname (lua_State *L, CallInfo *ci,
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const l_char **name);
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static int isLmark (CallInfo *ci) {
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lua_assert(ci == NULL || ttype(ci->base - 1) == LUA_TFUNCTION);
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return (ci && ci->prev && !ci_func(ci)->c.isC);
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}
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LUA_API lua_Hook lua_setcallhook (lua_State *L, lua_Hook func) {
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lua_Hook oldhook;
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lua_lock(L);
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oldhook = L->callhook;
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L->callhook = func;
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lua_unlock(L);
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return oldhook;
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}
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LUA_API lua_Hook lua_setlinehook (lua_State *L, lua_Hook func) {
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lua_Hook oldhook;
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lua_lock(L);
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oldhook = L->linehook;
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L->linehook = func;
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lua_unlock(L);
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return oldhook;
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}
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static CallInfo *ci_stack (lua_State *L, StkId obj) {
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CallInfo *ci = L->ci;
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while (ci->base > obj) ci = ci->prev;
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return (ci != &L->basefunc) ? ci : NULL;
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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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CallInfo *ci;
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int status;
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lua_lock(L);
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ci = L->ci;
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while (level-- && ci != &L->basefunc) {
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lua_assert(ci->base > ci->prev->base);
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ci = ci->prev;
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}
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if (ci == &L->basefunc) status = 0; /* there is no such level */
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else {
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ar->_ci = ci;
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status = 1;
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}
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lua_unlock(L);
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return status;
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}
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int luaG_getline (int *lineinfo, int pc, int refline, int *prefi) {
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int refi;
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if (lineinfo == NULL || pc == -1)
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return -1; /* no line info or function is not active */
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refi = prefi ? *prefi : 0;
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if (lineinfo[refi] < 0)
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refline += -lineinfo[refi++];
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lua_assert(lineinfo[refi] >= 0);
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while (lineinfo[refi] > pc) {
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refline--;
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refi--;
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if (lineinfo[refi] < 0)
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refline -= -lineinfo[refi--];
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lua_assert(lineinfo[refi] >= 0);
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}
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for (;;) {
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int nextline = refline + 1;
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int nextref = refi + 1;
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if (lineinfo[nextref] < 0)
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nextline += -lineinfo[nextref++];
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lua_assert(lineinfo[nextref] >= 0);
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if (lineinfo[nextref] > pc)
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break;
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refline = nextline;
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refi = nextref;
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}
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if (prefi) *prefi = refi;
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return refline;
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}
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static int currentpc (CallInfo *ci) {
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lua_assert(isLmark(ci));
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if (ci->pc)
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return (*ci->pc - ci_func(ci)->l.p->code) - 1;
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else
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return -1; /* function is not active */
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}
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static int currentline (CallInfo *ci) {
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if (!isLmark(ci))
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return -1; /* only active lua functions have current-line information */
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else {
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int *lineinfo = ci_func(ci)->l.p->lineinfo;
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return luaG_getline(lineinfo, currentpc(ci), 1, NULL);
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}
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}
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static Proto *getluaproto (CallInfo *ci) {
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return (isLmark(ci) ? ci_func(ci)->l.p : NULL);
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}
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LUA_API const l_char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
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const l_char *name;
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CallInfo *ci;
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Proto *fp;
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lua_lock(L);
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name = NULL;
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ci = ar->_ci;
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fp = getluaproto(ci);
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if (fp) { /* is a Lua function? */
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name = luaF_getlocalname(fp, n, currentpc(ci));
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if (name)
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luaA_pushobject(L, ci->base+(n-1)); /* push value */
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}
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lua_unlock(L);
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return name;
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}
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LUA_API const l_char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
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const l_char *name;
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CallInfo *ci;
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Proto *fp;
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lua_lock(L);
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name = NULL;
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ci = ar->_ci;
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fp = getluaproto(ci);
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L->top--; /* pop new value */
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if (fp) { /* is a Lua function? */
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name = luaF_getlocalname(fp, n, currentpc(ci));
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if (!name || name[0] == l_c('(')) /* `(' starts private locals */
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name = NULL;
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else
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setobj(ci->base+(n-1), L->top);
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}
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lua_unlock(L);
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return name;
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}
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static void infoLproto (lua_Debug *ar, Proto *f) {
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ar->source = getstr(f->source);
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ar->linedefined = f->lineDefined;
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ar->what = l_s("Lua");
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}
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static void funcinfo (lua_State *L, lua_Debug *ar, StkId func) {
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Closure *cl;
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if (ttype(func) == LUA_TFUNCTION)
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cl = clvalue(func);
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else {
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luaD_error(L, l_s("value for `lua_getinfo' is not a function"));
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cl = NULL; /* to avoid warnings */
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}
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if (cl->c.isC) {
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ar->source = l_s("=C");
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ar->linedefined = -1;
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ar->what = l_s("C");
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}
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else
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infoLproto(ar, cl->l.p);
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luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
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if (ar->linedefined == 0)
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ar->what = l_s("main");
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}
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static const l_char *travtagmethods (global_State *G, const TObject *o) {
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if (ttype(o) == LUA_TFUNCTION) {
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int e;
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for (e=0; e<TM_N; e++) {
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int t;
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for (t=0; t<G->ntag; t++)
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if (clvalue(o) == luaT_gettm(G, t, e))
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return luaT_eventname[e];
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}
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}
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return NULL;
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}
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static const l_char *travglobals (lua_State *L, const TObject *o) {
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Hash *g = L->gt;
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int i;
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for (i=0; i<g->size; i++) {
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if (luaO_equalObj(o, val(node(g, i))) &&
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ttype(key(node(g, i))) == LUA_TSTRING)
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return getstr(tsvalue(key(node(g, i))));
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}
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return NULL;
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}
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static void getname (lua_State *L, const TObject *f, lua_Debug *ar) {
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/* try to find a name for given function */
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if ((ar->name = travglobals(L, f)) != NULL)
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ar->namewhat = l_s("global");
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/* not found: try tag methods */
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else if ((ar->name = travtagmethods(G(L), f)) != NULL)
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ar->namewhat = l_s("tag-method");
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else ar->namewhat = l_s(""); /* not found at all */
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}
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LUA_API int lua_getinfo (lua_State *L, const l_char *what, lua_Debug *ar) {
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StkId f;
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CallInfo *ci;
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int status = 1;
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lua_lock(L);
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if (*what != l_c('>')) { /* function is active? */
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ci = ar->_ci;
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f = ci->base - 1;
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}
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else {
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what++; /* skip the `>' */
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ci = NULL;
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f = L->top - 1;
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}
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for (; *what; what++) {
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switch (*what) {
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case l_c('S'): {
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funcinfo(L, ar, f);
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break;
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}
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case l_c('l'): {
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ar->currentline = currentline(ci);
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break;
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}
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case l_c('u'): {
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ar->nups = (ttype(f) == LUA_TFUNCTION) ? clvalue(f)->c.nupvalues : 0;
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break;
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}
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case l_c('n'): {
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ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
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if (ar->namewhat == NULL)
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getname(L, f, ar);
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break;
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}
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case l_c('f'): {
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setobj(L->top, f);
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incr_top; /* push function */
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break;
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}
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default: status = 0; /* invalid option */
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}
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}
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if (!ci) L->top--; /* pop function */
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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 and code checker
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** =======================================================
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*/
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#define check(x) if (!(x)) return 0;
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#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
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#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
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static int checklineinfo (const Proto *pt) {
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int *lineinfo = pt->lineinfo;
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if (lineinfo == NULL) return 1;
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check(pt->sizelineinfo >= 2 && lineinfo[pt->sizelineinfo-1] == MAX_INT);
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if (*lineinfo < 0) lineinfo++;
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check(*lineinfo == 0);
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return 1;
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}
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static int precheck (const Proto *pt) {
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check(checklineinfo(pt));
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check(pt->maxstacksize <= MAXSTACK);
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check(pt->numparams+pt->is_vararg <= pt->maxstacksize);
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check(GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
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return 1;
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}
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static int checkopenop (const Proto *pt, int pc) {
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Instruction i = pt->code[pc+1];
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switch (GET_OPCODE(i)) {
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case OP_CALL:
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case OP_RETURN: {
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check(GETARG_B(i) == NO_REG);
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return 1;
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}
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case OP_SETLISTO: return 1;
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default: return 0; /* invalid instruction after an open call */
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}
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}
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static Instruction luaG_symbexec (const Proto *pt, int lastpc, int reg) {
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int pc;
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int last; /* stores position of last instruction that changed `reg' */
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last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
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if (reg == NO_REG) /* full check? */
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check(precheck(pt));
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for (pc = 0; pc < lastpc; pc++) {
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const Instruction i = pt->code[pc];
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OpCode op = GET_OPCODE(i);
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int a = GETARG_A(i);
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int b = 0;
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int c = 0;
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checkreg(pt, a);
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switch (getOpMode(op)) {
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case iABC: {
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b = GETARG_B(i);
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c = GETARG_C(i);
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if (testOpMode(op, OpModeBreg))
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checkreg(pt, b);
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if (testOpMode(op, OpModeCreg))
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check(c < pt->maxstacksize ||
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(c >= MAXSTACK && c-MAXSTACK < pt->sizek));
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break;
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}
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case iABc: {
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b = GETARG_Bc(i);
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if (testOpMode(op, OpModeK)) check(b < pt->sizek);
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break;
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}
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case iAsBc: {
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b = GETARG_sBc(i);
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break;
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}
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}
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if (testOpMode(op, OpModesetA)) {
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if (a == reg) last = pc; /* change register `a' */
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}
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if (testOpMode(op, OpModeT))
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check(GET_OPCODE(pt->code[pc+1]) == OP_CJMP);
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switch (op) {
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case OP_LOADNIL: {
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if (a <= reg && reg <= b)
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last = pc; /* set registers from `a' to `b' */
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break;
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}
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case OP_GETUPVAL:
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case OP_SETUPVAL: {
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check(b < pt->nupvalues);
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break;
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}
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case OP_GETGLOBAL:
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case OP_SETGLOBAL: {
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check(ttype(&pt->k[b]) == LUA_TSTRING);
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break;
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}
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case OP_SELF: {
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checkreg(pt, a+1);
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if (reg == a+1) last = pc;
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break;
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}
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case OP_CONCAT: {
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/* `c' is a register, and at least two operands */
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check(c < MAXSTACK && b < c);
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break;
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}
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case OP_JMP:
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case OP_CJMP: {
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int dest = pc+1+b;
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check(0 <= dest && dest < pt->sizecode);
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/* not full check and jump is forward and do not skip `lastpc'? */
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if (reg != NO_REG && pc < dest && dest <= lastpc)
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pc += b; /* do the jump */
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break;
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}
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case OP_NILJMP: {
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check(pc+2 < pt->sizecode); /* check its jump */
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break;
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}
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case OP_CALL: {
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if (b != NO_REG) {
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checkreg(pt, a+b);
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}
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if (c == NO_REG) {
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check(checkopenop(pt, pc));
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}
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else if (c != 0)
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checkreg(pt, a+c-1);
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if (reg >= a) last = pc; /* affect all registers above base */
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break;
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}
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case OP_RETURN: {
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if (b != NO_REG && b != 0)
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checkreg(pt, a+b-1);
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break;
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}
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case OP_FORPREP:
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case OP_TFORPREP: {
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int dest = pc-b; /* jump is negated here */
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check(0 <= dest && dest < pt->sizecode &&
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GET_OPCODE(pt->code[dest]) == op+1);
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break;
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}
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case OP_FORLOOP:
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case OP_TFORLOOP: {
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int dest = pc+b;
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check(0 <= dest && dest < pt->sizecode &&
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pt->code[dest] == SET_OPCODE(i, op-1));
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checkreg(pt, a + ((op == OP_FORLOOP) ? 2 : 3));
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break;
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}
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case OP_SETLIST: {
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checkreg(pt, a + (b&(LFIELDS_PER_FLUSH-1)) + 1);
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break;
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}
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case OP_CLOSURE: {
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check(b < pt->sizep);
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check(pc + pt->p[b]->nupvalues < pt->sizecode);
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break;
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}
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default: break;
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}
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}
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return pt->code[last];
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}
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/* }====================================================== */
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int luaG_checkcode (const Proto *pt) {
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return luaG_symbexec(pt, pt->sizecode, NO_REG);
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}
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static const l_char *getobjname (lua_State *L, StkId obj, const l_char **name) {
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CallInfo *ci = ci_stack(L, obj);
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if (isLmark(ci)) { /* an active Lua function? */
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Proto *p = ci_func(ci)->l.p;
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int pc = currentpc(ci);
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int stackpos = obj - ci->base;
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Instruction i;
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*name = luaF_getlocalname(p, stackpos+1, pc);
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if (*name) /* is a local? */
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return l_s("local");
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i = luaG_symbexec(p, pc, stackpos); /* try symbolic execution */
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lua_assert(pc != -1);
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switch (GET_OPCODE(i)) {
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case OP_GETGLOBAL: {
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lua_assert(ttype(&p->k[GETARG_Bc(i)]) == LUA_TSTRING);
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*name = svalue(&p->k[GETARG_Bc(i)]);
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return l_s("global");
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}
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case OP_MOVE: {
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int a = GETARG_A(i);
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int b = GETARG_B(i); /* move from `b' to `a' */
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if (b < a)
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return getobjname(L, ci->base+b, name); /* get name for `b' */
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break;
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}
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case OP_GETTABLE:
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case OP_SELF: {
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int c = GETARG_C(i) - MAXSTACK;
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if (c >= 0 && ttype(&p->k[c]) == LUA_TSTRING) {
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*name = svalue(&p->k[c]);
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return l_s("field");
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}
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break;
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}
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default: break;
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}
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}
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return NULL; /* no useful name found */
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}
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static const l_char *getfuncname (lua_State *L, CallInfo *ci,
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const l_char **name) {
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ci = ci->prev; /* calling function */
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if (ci == &L->basefunc || !isLmark(ci))
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return NULL; /* not an active Lua function */
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else {
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Proto *p = ci_func(ci)->l.p;
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int pc = currentpc(ci);
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Instruction i;
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if (pc == -1) return NULL; /* function is not activated */
|
|
i = p->code[pc];
|
|
return (GET_OPCODE(i) == OP_CALL
|
|
? getobjname(L, ci->base+GETARG_A(i), name)
|
|
: NULL); /* no useful name found */
|
|
}
|
|
}
|
|
|
|
|
|
void luaG_typeerror (lua_State *L, StkId o, const l_char *op) {
|
|
const l_char *name;
|
|
const l_char *kind = getobjname(L, o, &name);
|
|
const l_char *t = luaT_typename(G(L), o);
|
|
if (kind)
|
|
luaO_verror(L, l_s("attempt to %.30s %.20s `%.40s' (a %.10s value)"),
|
|
op, kind, name, t);
|
|
else
|
|
luaO_verror(L, l_s("attempt to %.30s a %.10s 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, l_s("concat"));
|
|
}
|
|
|
|
|
|
void luaG_aritherror (lua_State *L, StkId p1, TObject *p2) {
|
|
TObject temp;
|
|
if (luaV_tonumber(p1, &temp) != NULL)
|
|
p1 = p2; /* first operand is OK; error is in the second */
|
|
luaG_typeerror(L, p1, l_s("perform arithmetic on"));
|
|
}
|
|
|
|
|
|
void luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) {
|
|
const l_char *t1 = luaT_typename(G(L), p1);
|
|
const l_char *t2 = luaT_typename(G(L), p2);
|
|
if (t1[2] == t2[2])
|
|
luaO_verror(L, l_s("attempt to compare two %.10s values"), t1);
|
|
else
|
|
luaO_verror(L, l_s("attempt to compare %.10s with %.10s"), t1, t2);
|
|
}
|
|
|