mirror of
https://github.com/lua/lua.git
synced 2024-11-27 12:13:38 +08:00
520 lines
13 KiB
C
520 lines
13 KiB
C
/*
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** $Id: ldebug.c,v 1.113 2002/05/09 14:14:34 roberto Exp roberto $
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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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#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 char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
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static int isLmark (CallInfo *ci) {
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return (ttype(ci->base - 1) == LUA_TFUNCTION && !ci_func(ci)->c.isC);
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}
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static int currentpc (lua_State *L, CallInfo *ci) {
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if (ci->pc == NULL) return -1; /* function is not an active Lua function */
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if (ci == L->ci || ci->pc != (ci+1)->pc) /* no other function using `pc'? */
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ci->savedpc = *ci->pc; /* may not be saved; save it */
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/* function's pc is saved */
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return pcRel(ci->savedpc, ci_func(ci)->l.p);
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}
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static int currentline (lua_State *L, CallInfo *ci) {
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int pc = currentpc(L, ci);
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if (pc < 0)
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return -1; /* only active lua functions have current-line information */
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else
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return getline(ci_func(ci)->l.p, pc);
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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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CallInfo *ci;
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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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for (ci = L->base_ci; ci <= L->ci; ci++)
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currentpc(L, ci); /* update `savedpc' */
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lua_unlock(L);
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return oldhook;
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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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lua_lock(L);
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if (L->ci - L->base_ci <= level) status = 0; /* there is no such level */
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else {
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ar->i_ci = (L->ci - L->base_ci) - level;
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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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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 char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
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const 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 = L->base_ci + ar->i_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(L, 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 char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
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const 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 = L->base_ci + ar->i_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(L, ci));
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if (!name || name[0] == '(') /* `(' 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 = "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_runerror(L, "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 = "=C";
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ar->linedefined = -1;
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ar->what = "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 = "main";
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}
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static const char *travglobals (lua_State *L, const TObject *o) {
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Table *g = hvalue(gt(L));
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int i = sizenode(g);
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while (i--) {
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Node *n = node(g, i);
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if (luaO_equalObj(o, val(n)) && ttype(key(n)) == LUA_TSTRING)
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return getstr(tsvalue(key(n)));
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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 = "global";
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else ar->namewhat = ""; /* not found */
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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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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 != '>') { /* function is active? */
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ci = L->base_ci + ar->i_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 'S': {
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funcinfo(L, ar, f);
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break;
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}
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case 'l': {
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ar->currentline = (ci) ? currentline(L, ci) : -1;
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break;
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}
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case '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 '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 'f': {
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setobj(L->top, f);
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status = 2;
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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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if (status == 2) incr_top(L);
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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 precheck (const Proto *pt) {
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check(pt->maxstacksize <= MAXSTACK);
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lua_assert(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_TAILCALL:
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case OP_RETURN: {
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check(GETARG_B(i) == 0);
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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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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 iABx: {
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b = GETARG_Bx(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 iAsBx: {
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b = GETARG_sBx(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(pc+2 < pt->sizecode); /* check skip */
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check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
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}
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switch (op) {
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case OP_LOADBOOL: {
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check(c == 0 || pc+2 < pt->sizecode); /* check its jump */
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break;
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}
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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_TFORLOOP:
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checkreg(pt, a+2+c);
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/* go through */
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case OP_FORLOOP:
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checkreg(pt, a+2);
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/* go through */
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case OP_JMP: {
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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_CALL: {
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if (b != 0) {
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checkreg(pt, a+b-1);
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}
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c--; /* c = num. returns */
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if (c == LUA_MULTRET) {
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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_TAILCALL:
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case OP_RETURN: {
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b--; /* b = num. returns */
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if (b > 0) checkreg(pt, a+b-1);
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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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int nup;
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check(b < pt->sizep);
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nup = pt->p[b]->nupvalues;
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check(pc + nup < pt->sizecode);
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for (; nup>0; nup--) {
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OpCode op1 = GET_OPCODE(pt->code[pc+nup]);
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check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
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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 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 char *kname (Proto *p, int c) {
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c = c - MAXSTACK;
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if (c >= 0 && ttype(&p->k[c]) == LUA_TSTRING)
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return svalue(&p->k[c]);
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else
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return "?";
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}
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static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos,
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const char **name) {
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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(L, ci);
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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 "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_Bx(i)]) == LUA_TSTRING);
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*name = svalue(&p->k[GETARG_Bx(i)]);
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return "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, 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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*name = luaF_getlocalname(p, GETARG_B(i)+1, pc);
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if (*name && *name[0] == '*') {
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*name = kname(p, GETARG_C(i));
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return "global";
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}
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*name = kname(p, GETARG_C(i));
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return "field";
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break;
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}
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case OP_SELF: {
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*name = kname(p, GETARG_C(i));
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return "method";
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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 Instruction getcurrentinstr (lua_State *L, CallInfo *ci) {
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if (ci == L->base_ci || !isLmark(ci))
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return (Instruction)(-1); /* not an active Lua function */
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else
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return ci_func(ci)->l.p->code[currentpc(L, ci)];
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}
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static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
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Instruction i;
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ci--; /* calling function */
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i = getcurrentinstr(L, ci);
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return (GET_OPCODE(i) == OP_CALL ? getobjname(L, ci, GETARG_A(i), name)
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: NULL); /* no useful name found */
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}
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/* only ANSI way to check whether a pointer points to an array */
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static int isinstack (CallInfo *ci, const TObject *o) {
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StkId p;
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for (p = ci->base; p < ci->top; p++)
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if (o == p) return 1;
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return 0;
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}
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void luaG_typeerror (lua_State *L, const TObject *o, const char *op) {
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const char *name;
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const char *t = luaT_typenames[ttype(o)];
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const char *kind = NULL;
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if (isinstack(L->ci, o))
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kind = getobjname(L, L->ci, o - L->ci->base, &name);
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if (kind)
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luaO_verror(L, "attempt to %s %s `%s' (a %s value)",
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op, kind, name, t);
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else
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luaO_verror(L, "attempt to %s a %s value", op, t);
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}
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void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
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if (ttype(p1) == LUA_TSTRING) p1 = p2;
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lua_assert(ttype(p1) != LUA_TSTRING);
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luaG_typeerror(L, p1, "concat");
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}
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void luaG_aritherror (lua_State *L, StkId p1, const TObject *p2) {
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TObject temp;
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if (luaV_tonumber(p1, &temp) == NULL)
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p2 = p1; /* first operand is wrong */
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luaG_typeerror(L, p2, "perform arithmetic on");
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}
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void luaG_ordererror (lua_State *L, const TObject *p1, const TObject *p2) {
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const char *t1 = luaT_typenames[ttype(p1)];
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const char *t2 = luaT_typenames[ttype(p2)];
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if (t1[2] == t2[2])
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luaO_verror(L, "attempt to compare two %s values", t1);
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else
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luaO_verror(L, "attempt to compare %s with %s", t1, t2);
|
|
}
|
|
|