mirror of
https://github.com/lua/lua.git
synced 2024-11-24 10:43:44 +08:00
589 lines
15 KiB
C
589 lines
15 KiB
C
/*
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** $Id: ldebug.c,v 2.9 2004/10/04 19:04:34 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 <stdarg.h>
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#include <stddef.h>
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#include <string.h>
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#define ldebug_c
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#define LUA_CORE
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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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static const char *getfuncname (CallInfo *ci, const char **name);
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static int currentpc (CallInfo *ci) {
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if (!isLua(ci)) return -1; /* function is not a Lua function? */
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return pcRel(ci->savedpc, ci_func(ci)->l.p);
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}
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static int currentline (CallInfo *ci) {
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int pc = currentpc(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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/*
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** this function can be called asynchronous (e.g. during a signal)
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*/
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LUA_API int 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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L->hook = func;
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L->basehookcount = count;
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resethookcount(L);
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L->hookmask = cast(lu_byte, mask);
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return 1;
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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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lua_lock(L);
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for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
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level--;
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if (f_isLua(ci)) /* Lua function? */
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level -= ci->tailcalls; /* skip lost tail calls */
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}
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if (level > 0 || ci == L->base_ci) status = 0; /* there is no such level */
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else if (level < 0) { /* level is of a lost tail call */
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status = 1;
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ar->i_ci = 0;
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}
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else {
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status = 1;
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ar->i_ci = ci - L->base_ci;
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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 (isLua(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(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(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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setobjs2s(L, 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 funcinfo (lua_Debug *ar, StkId func) {
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Closure *cl = clvalue(func);
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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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ar->source = getstr(cl->l.p->source);
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ar->linedefined = cl->l.p->lineDefined;
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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 info_tailcall (lua_State *L, lua_Debug *ar) {
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ar->name = ar->namewhat = "";
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ar->what = "tail";
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ar->linedefined = ar->currentline = -1;
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ar->source = "=(tail call)";
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luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
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ar->nups = 0;
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setnilvalue(L->top);
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}
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static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
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StkId 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) ? currentline(ci) : -1;
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break;
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}
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case 'u': {
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ar->nups = clvalue(f)->c.nupvalues;
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break;
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}
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case 'n': {
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ar->namewhat = (ci) ? getfuncname(ci, &ar->name) : NULL;
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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 'f': {
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setobj2s(L, L->top, f);
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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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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 = 1;
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lua_lock(L);
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if (*what == '>') {
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StkId f = L->top - 1;
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if (!ttisfunction(f))
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luaG_runerror(L, "value for `lua_getinfo' is not a function");
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status = auxgetinfo(L, what + 1, ar, f, NULL);
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L->top--; /* pop function */
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}
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else if (ar->i_ci != 0) { /* no tail call? */
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CallInfo *ci = L->base_ci + ar->i_ci;
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lua_assert(ttisfunction(ci->func));
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status = auxgetinfo(L, what, ar, ci->func, ci);
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}
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else
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info_tailcall(L, ar);
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if (strchr(what, 'f')) 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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check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
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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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#define checkopenop(pt,pc) luaG_checkopenop((pt)->code[(pc)+1])
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int luaG_checkopenop (Instruction i) {
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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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case OP_SETLIST: {
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check(GETARG_B(i) == 0);
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return 1;
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}
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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 int checkArgMode (const Proto *pt, int r, enum OpArgMask mode) {
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switch (mode) {
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case OpArgN: check(r == 0); break;
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case OpArgU: break;
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case OpArgR: checkreg(pt, r); break;
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case OpArgK:
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check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize);
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break;
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}
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return 1;
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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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check(op < NUM_OPCODES);
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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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check(checkArgMode(pt, b, getBMode(op)));
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check(checkArgMode(pt, c, getCMode(op)));
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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 (getBMode(op) == OpArgK) 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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if (getBMode(op) == OpArgR) {
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int dest = pc+1+b;
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check(0 <= dest && dest < pt->sizecode);
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if (dest > 0) {
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/* cannot jump to a setlist count */
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const Instruction d = pt->code[dest-1];
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check(!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0));
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}
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}
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break;
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}
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}
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if (testAMode(op)) {
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if (a == reg) last = pc; /* change register `a' */
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}
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if (testTMode(op)) {
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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->nups);
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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(ttisstring(&pt->k[b]));
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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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check(b < c); /* at least two operands */
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break;
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}
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case OP_TFORLOOP: {
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check(c >= 1); /* at least one result (control variable) */
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checkreg(pt, a+3+c); /* space for results */
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if (reg >= a+3) last = pc; /* affect all regs above its call base */
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break;
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}
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case OP_TFORPREP:
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case OP_FORLOOP:
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case OP_FORPREP:
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checkreg(pt, a+3);
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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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/* 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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case OP_TAILCALL: {
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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_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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if (b > 0) checkreg(pt, a + b);
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if (c == 0) pc++;
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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]->nups;
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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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case OP_VARARG: {
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check(pt->is_vararg & NEWSTYLEVARARG);
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b--;
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if (b == LUA_MULTRET) check(checkopenop(pt, pc));
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checkreg(pt, a+b-1);
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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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#undef check
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#undef checkjump
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#undef checkreg
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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) != 0);
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}
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static const char *kname (Proto *p, int c) {
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if (ISK(c) && ttisstring(&p->k[INDEXK(c)]))
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return svalue(&p->k[INDEXK(c)]);
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else
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return "?";
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}
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static const char *getobjname (CallInfo *ci, int stackpos, const char **name) {
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if (isLua(ci)) { /* a 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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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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int g = GETARG_Bx(i); /* global index */
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lua_assert(ttisstring(&p->k[g]));
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*name = svalue(&p->k[g]);
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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(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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int k = GETARG_C(i); /* key index */
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*name = kname(p, k);
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return "field";
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}
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case OP_GETUPVAL: {
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int u = GETARG_B(i); /* upvalue index */
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*name = getstr(p->upvalues[u]);
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return "upvalue";
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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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*name = kname(p, k);
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return "method";
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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 char *getfuncname (CallInfo *ci, const char **name) {
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Instruction i;
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if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
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return NULL; /* calling function is not Lua (or is unknown) */
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ci--; /* calling function */
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i = ci_func(ci)->l.p->code[currentpc(ci)];
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if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
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GET_OPCODE(i) == OP_TFORLOOP)
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return getobjname(ci, GETARG_A(i), name);
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else
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return NULL; /* no useful name can be 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 TValue *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 TValue *o, const char *op) {
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const char *name = NULL;
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const char *t = luaT_typenames[ttype(o)];
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const char *kind = (isinstack(L->ci, o)) ?
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getobjname(L->ci, o - L->base, &name) : NULL;
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if (kind)
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luaG_runerror(L, "attempt to %s %s `%s' (a %s value)",
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|
op, kind, name, t);
|
|
else
|
|
luaG_runerror(L, "attempt to %s a %s value", op, t);
|
|
}
|
|
|
|
|
|
void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
|
|
if (ttisstring(p1)) p1 = p2;
|
|
lua_assert(!ttisstring(p1));
|
|
luaG_typeerror(L, p1, "concatenate");
|
|
}
|
|
|
|
|
|
void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
TValue temp;
|
|
if (luaV_tonumber(p1, &temp) == NULL)
|
|
p2 = p1; /* first operand is wrong */
|
|
luaG_typeerror(L, p2, "perform arithmetic on");
|
|
}
|
|
|
|
|
|
int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
const char *t1 = luaT_typenames[ttype(p1)];
|
|
const char *t2 = luaT_typenames[ttype(p2)];
|
|
if (t1[2] == t2[2])
|
|
luaG_runerror(L, "attempt to compare two %s values", t1);
|
|
else
|
|
luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void addinfo (lua_State *L, const char *msg) {
|
|
CallInfo *ci = L->ci;
|
|
if (isLua(ci)) { /* is Lua code? */
|
|
char buff[LUA_IDSIZE]; /* add file:line information */
|
|
int line = currentline(ci);
|
|
luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
|
|
luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
|
|
}
|
|
}
|
|
|
|
|
|
void luaG_errormsg (lua_State *L) {
|
|
if (L->errfunc != 0) { /* is there an error handling function? */
|
|
StkId errfunc = restorestack(L, L->errfunc);
|
|
if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
|
|
setobjs2s(L, L->top, L->top - 1); /* move argument */
|
|
setobjs2s(L, L->top - 1, errfunc); /* push function */
|
|
incr_top(L);
|
|
luaD_call(L, L->top - 2, 1); /* call it */
|
|
}
|
|
luaD_throw(L, LUA_ERRRUN);
|
|
}
|
|
|
|
|
|
void luaG_runerror (lua_State *L, const char *fmt, ...) {
|
|
va_list argp;
|
|
va_start(argp, fmt);
|
|
addinfo(L, luaO_pushvfstring(L, fmt, argp));
|
|
va_end(argp);
|
|
luaG_errormsg(L);
|
|
}
|
|
|